Carburetor

FIELD: engines and pumps.

SUBSTANCE: carburetor comprises main air channel 19, controlled throttle valve 8, fuel proportioning valve 23, fuel injector 28 and auxiliary air valve 13. Main air channel 19 has upstream inlet 6 and downstream outlet 11. Controlled throttle valve 8 is arranged inside main air channel. Fuel injector 28 communicates with main air channel and fuel proportioning valve 23. Extra air channel 13 has inlet 10 and outlet 24. Outlet 39 of fuel proportioning valve 23 communicates with extra air channel 13. Fuel feed injector 28 communicates with auxiliary and main air channels 13, 19 to allow fuel to be mixed with air flowing through air channel 13 before it flows through injector 28 and mixes with air flowing in main air channel 19 downstream of controlled throttle valve 8.

EFFECT: stable operation at low load and in idling.

23 cl, 21 dwg

 

This invention relates to carburetors for two-stroke, and more specifically four-stroke internal combustion engines, and relates to a carburetor of the type which includes a main air duct, an adjustable throttle valve, located inside the main air conduit and the injector fuel chamber connected with the main air channel and connected to the metering valve of the fuel to change the amount of fuel released through the nozzle.

Such carburetors are well known. Known and metering valves of different types, but the valve is the most widespread type is the needle valve. Such valves include an elongated needle valve communicating with the nozzle, which forms the jet fuel. Needle valve, available in needle valve is inevitably relatively long thin component, which is supported only at one end, and communicates with the nozzle and controls fuel flow just another simply supported end. To the carburetor are required, namely, that they must provide reliable, accurate and reproducible control of the air-fuel mixture in compliance with the tuning parameters of the idle speed, rpm full speed and intermediate speed of the engine, and about arozena, what needle valve inevitably incapable of this, as is invariably very small lateral movement on papercom the end of the needle valve can lead to quite large changes in the mode and volume of fuel flow, particularly at low numbers of revolutions of the engine. This can lead to changes in the component ratio of the air-fuel mixture, and therefore increase fuel consumption and pollutant emissions, as well as to instability of the engine, particularly at idle. In carburetors of mass production it is also desirable that the operating parameters and characteristics of all of them were identical, and discovered that it is in practice not the case, mainly because of the difficulty of achieving identical size and position of the needle valve. In addition, to ensure that the supply of air and fuel properly aligned, in a known carburetor throttle valve and needle valve are interconnected for joint movement of complex mechanical link. This link is subject to change due to the manufacturing tolerances and requires complex and expensive machining and Assembly.

Therefore, the objective of the invention is to develop a carburetor, which guarantees the supply of fuel which is more accurate, reliable, reproducible is Imam and compact way. An additional object of the invention is to develop a carburetor, the result of which will be stable, economical and reproducible operation, particularly at low speeds and when the numbers of turns of idling of the engine. Another object of the invention is to develop a carburetor in which the fuel supply is regulated so that it is immediate, robust, reliable and compact way connected with the rotational speed and/or engine load, and in which the control mechanism is contained inside the body of the carburetor. Another additional object of the invention is to develop a link between the metering valve of the fuel and the throttle valve, which will ensure that the supply of fuel and air will be properly coordinated, but which will be simple, reliable and economical to manufacture.

In accordance with this invention is provided with a carburetor comprising a main air channel having upstream inlet (6) and the downstream discharge outlet, an adjustable throttle valve, located inside the main air channel, injector fuel supply chamber connected with the main air channel and connected to the metering valve Topley is to modify the quantity of fuel, released through the nozzle, and the said metering valve fuel includes forming a channel element, which can move concluded the valve element, thus forming a channel element and the valve element to limit the scope of the inlet fuel inlet for the fuel that communicates with space for intake of fuel, an outlet for the fuel passing through the wall forming the channel element and in communication with the injector fuel supply, and the plot external surface of the valve element shaped so that the valve element is arranged to move relative to the forming channel element so that the size of the messages between space for intake of fuel and the outlet for the fuel gradually varies between a maximum and a minimum value, characterized in that it contains an auxiliary air channel with an inlet opening and an outlet opening in the main air channel between the adjustable throttle valve and behind the outlet of the main air duct, and an outlet for fuel valve fuel metering is communicated with the auxiliary air channel, injector fuel supply is communicated with the auxiliary and the main air channels Thu the fuel can be mixed with air, the current through the auxiliary air channel before flowing through the nozzle and is mixed with air flowing in the main air duct downstream from the adjustable throttle valve.

Thus, in the carburetor in accordance with this invention a conventional metering valve of the fuel related to the type of needle clans, replaced by a movable valve containing a valve element, a prisoner can move inside forming a channel element, such as an elongated sleeve or tube. The sleeve may be a separate element, or it can be connected with a part of a larger component, implemented as a single whole with him, or to form this portion, and thus can form a block or a similar tool, which is drilled or otherwise formed an elongated hole or opening. The sleeve limits the space for the fuel inlet at one end of the valve element, which communicates with the inlet for fuel, which can be done either through the end of the sleeve, either through the side wall. The outlet for the fuel passes through the side wall of the sleeve. The valve element is shaped or provided with a relief on one of its lateral surfaces located opposite the outlet for the fuel. In one embodiment, the implementation of the Oia, one of the side surfaces of the valve element provided with a relief or cut-out point, intermediate between its ends, and the number of deleted material gradually increases toward the end closest to the camera for intake of fuel. This means that the valve element performs linear movement within the sleeve, and the area of communication between the space for the fuel inlet and the outlet will gradually change, resulting in changes the amount of fuel released through the outlet. The valve element may be relatively massive in comparison with the conventional thin needle valve, and this fact is associated with the fact that the valve element will be based at least on part of its length by contact with the inner surface of the sleeve and/or on one or more sealing elements provided inside the sleeve, means that the transverse movement of the valve element relative to the sleeve effectively prevented, and therefore, the quantity of fuel passing through the valve, can be controlled much more accurately than by conventional needle valves. In addition, the fact that the valve element is relatively massive item, means that its mechanical processing can be very accurate and reproducible, which features a large number of carburetors mass production can b the th essentially, identical. The specific shape of the profiled section of the valve element can be changed as desired to obtain precise changes of the fuel in the desired position of the throttle valve.

Elongated internal space inside the sleeve, and thus the outer contour of the valve element can have many different forms and therefore can be, for example, rectangular or elliptical. However, it may seem preferable way in which they have a circular cross-section.

Carburetor preferably includes a non-return valve located between the intake of fuel and space for intake of fuel. This valve will prevent any reverse flow of fuel and to minimize the effect of transients of pressure on the rate of flow of fuel through the valve, thereby substantially reducing or eliminating one of the problems, which is normal for carburetors with the valve needle type.

As mentioned above, the valve element can be made with the possibility of linear movement within the sleeve. In alternative or additional embodiment, it can be made with the possibility of movement during the rotation of the internal sleeve, and this, of course, will necessitate profiling the side surface of the valve e is ementa with giving her a very different form, to obtain the desired change of the characteristics of the flow of fuel as the gradual rotation of the valve element.

If that preferably, the valve element has a round cross section, so that it will be concluded within the space of a round or at least partially circular cross-section within the sleeve, at least theoretically, there is a risk that it will inevitably be rotated within the sleeve, and if that happened, the visible area of the valve element would no longer be strictly aligned with the outlet for the fuel, and the flow characteristics through the valve is substantially changed. Therefore, the valve element preferably carries mounting means cooperating with the adjusting means carried by the sleeve, is arranged to control the angular position of the valve element relative to the sleeve. The installation tool on the valve element preferably is a groove extending at least along part of its length, and the sleeve carries a protrusion extending into this groove. Interacting groove and projection can be performed with the possibility of maintaining a constant angular position of the valve element within the sleeve, or they can be performed with a predetermined relative Versatel the nogo movement, which will happen when there is a longitudinal movement, and in this case, the groove is not linear, and some of the spiral.

Of course, it is desirable that proved impossible leakage of fuel from the space for intake of fuel between the opposing surfaces of the valve member and the sleeve or sealing element in position outside outlet for fuel, and that such leakage can be prevented by this design of the valve, with which it forms a sliding seal with the inner surface of the sleeve for some fraction of its length. In an alternative embodiment, the inner surface of the sleeve may have a raised area extending around the exhaust opening for fuel. This will create a tendency to increase the contact pressure at which the valve element is in contact with the surface of the sleeve in the vicinity of the outlet openings for the fuel and thereby improves the integrity of the seal. In an additional alternative embodiment, the sleeve may include a sealing element, which limits the recess in which is partially enclosed valve element and forms a seal with it, and which is made, at least part of the outlet.

In one embodiment, the sealing element contains incendie particles, as the valve element is made of magnetic material, preferably a ferromagnetic material, so that the seal between the valve element and the sealing element is improved magnetic attraction. In an alternative embodiment, the sealing element may contain ferromagnetic particles, and the sleeve may contain a magnet that attracts the sealing element to the valve element, thereby improving the seal between them. In an additional alternative embodiment, the valve element is ferromagnetic, and the sleeve contains one or more magnets located between the sealing element and the valve element, resulting attractive force between the sealing element and the valve element acts on the sealing element, thus improving the seal between it and the valve element.

The carburetors are commonly used for dispensing conventional gasoline, but for internal combustion engines are used and other fuels, such as paraffin, which burn at different ratio of components of the air-fuel mixture. The carburetor in accordance with the invention can be converted to obtain different component ratio of the air-fuel mixture by removing the valve element and replace it with a different valve element Pro is b which is the other. However, one could also envisage the valve element having two or more shaped regions on different areas of its lateral surface, and all that is then required to convert the carburetor so that it is suitable for different fuel is to remove the valve element and rotate it, for example, 180, and then back again, resulting in another profiled region will now communicate with the outlet for fuel.

It may also be desirable to make the carburetor is able to dispense two or more different liquids simultaneously, for example, two different fuel or regular gasoline and lubricating oil for two-stroke engine, or the same liquid at two different points. The carburetor in accordance with the invention can easily be converted with the aim of dispensing two liquids at the same time, providing the wall of the bushing holes in two or even more, which interact with corresponding profiled areas of the valve element, and providing an outlet in the number two or even more connected with appropriate spaces for the release, which, in turn, communicated with the respective profiled areas of the valve element. Profiling of different areas of the valve, the second element will be different, and so will occur simultaneously dispensing different quantities of different liquids. Precise amounts of liquids, of course, will be determined by the peculiarities of profiling the valve element.

In a preferred embodiment of the invention, the carburetor includes an additional metering valve of the fuel, namely the metering valve fuel at idle, for dispensing small quantities of fuel required for engine operation at idle, connected in parallel with the metering valve fuel or sequentially with him. This aspect of the present invention is based on the realization that many of the difficulties associated with the accurate control of the quantity of the metered fuel quantity idle speed in the known carburetors, arise due to the fact that it is very difficult to achieve accurate calibration of the flow control valve, which is designed to control the flow in a wide range of cost changes. Thus, conventional needle valve in the carburetor will give the opportunity to get great fuel consumption when the engine is under full load, and only a very small flow rate when the engine is idling, and this is a big difference in the costs is very difficult in practice, a precise calibration of the valve when the latter is only slightly open, estivo the operating time of the engine idling. Therefore, this aspect of the present invention provides two valve dispensing fuel, one for idling and at very low speeds and the other for operation at higher speeds or loads. If both of these valve fuel metering provided parallel to each other, it is preferable that the main metering valve fuel was closed during operation of the engine at idle and as a result all the necessary fuel is supplied to the metering valve at idle. To increase the load and the engine speed begins for fuel through the main metering valve of the fuel, and virtually no matter if this continues low consumption through advanced metering valve at idle, since in practice it is only a very small fraction of the flow through the main metering valve. However, if the two valve fuel metering connected in series, it is necessary, of course, to the main metering valve remained at least slightly open all the time, even during idling, but the profile valve main valve dosing should preferably be such that essentially all the fuel management carried out an additional metering valve at idle Ho is at. In any case, the range of costs of additional fuel through the metering valve at idle is relatively small, and therefore very accurate calibration of the valve is simple, so it can essentially eliminate the above problem of the change of fuel consumption during idling.

In a preferred embodiment, an additional metering valve at idle is built into the main metering valve of the fuel, and in this case, the inlet for the fuel valve fuel metering may communicate with space for intake of fuel through the valve seat, the valve element of the valve dispensing fuel may incur additional valve element which cooperates with the valve seat and is with him an additional metering valve fuel. This is consistent with the layout of the main valve fuel metering and additional valve dispensing fuel at idle, and, therefore, the main metering valve fuel must remain slightly open during operation of the engine at idle. In an alternative embodiment, the valve element has an additional valve element, which interacts with a valve seat within the valve element, and edle valve communicates with the space for the intake and with the additional space inside the valve element, this extra space is communicated with an outlet opening for idling in the side surface of the valve element, and this is an outlet for idling is located so that it communicates with the exhaust hole in the sleeve when the carburetor is involved in idling. This is a parallel arrangement of two valves dispensing fuel, and therefore, the main metering valve fuel will probably be fully closed during operation of the engine at idle. The position of the additional valve element is preferably adjustable relative to the main valve element, allowing precise control of fuel consumption when idling.

In an alternative embodiment, the carburetor includes an integral control valve connected in series with the metering valve of the fuel, which is in operation is not only when the engine is running at idle, but at other speeds. Thus, this composite control valve, which is preferably located upstream of space for dispensing fuel and has an electric drive, can be used to regulate the mixing ratio of the air-fuel mixture at any speed and the can is to be used for compensation, for example, changes in the engine that arise over time or in connection with the exhaust gases with the oxygen content, which indicates that the mixture actually too poor.

Of course, the carburetor must include some mechanism that will move the valve element of the valve dispensing fuel synchronously with the movement of the throttle valve so that the feed rate of fuel and air will be properly coordinated with each other. In a preferred embodiment, the rotating input shaft configured to connect with a control number of revolutions of the engine and connected with the throttle valve to move it between open and closed positions with a rotating input shaft is also connected to the carriage for moving it, and the support carries at least one inclined surface which extends in the direction of movement of the carriage and which is in contact with the Cam connected to the valve element, so that the rotation of the input shaft results in movement of the throttle valve and the movement of the carriage, and hence the inclined surface, causing the Cam moves across the length of the inclined surface, and the valve element of the valve of the fuel metering so, too, the move is to be.

The support plate preferably carries one or more parallel tracks, and the caliper is connected with one or more bearing elements, which rest against the respective lanes, so that the caliper is directed so that makes a linear motion. It is therefore necessary that the input shaft was connected to the caliper via a link that will convert the rotary motion of the shaft into linear motion of the caliper, and it is preferable that this link would apply to the type of links with the dead stroke. For convenience, the shaft carries an arm carrying a projection, which is enclosed in an elongated groove in the caliper.

The input shaft should also be linked with the throttle valve to move it synchronously with the valve element of the valve dispensing of fuel, and preferably, this connection with the valve element of the valve of the fuel metering was implemented through the caliper and to the throttle valve was connected to the caliper by means of an additional link with the dead stroke, which converts the linear movement of the caliper into rotational motion of the throttle valve.

In one embodiment, the support includes parallel inclined surface, and the media valve, which is connected with the valve element and carries one or more rollers, based on the relevant NAC is ment surface.

In an alternative embodiment, the caliper is connected to the rotary input shaft for rotation with it, and the inclined surface has a partially circular shape. This implementation has the advantage of simplicity in that the links are dead stroke is no longer needed. When the caliper is moved synchronously with the rotation of the rotating input shaft, partially round inclined surface will also move, which will cause the movement of the Cam connected to the valve element in the direction of the length of the valve element, thereby causing axial displacement of the valve element.

As described above, the invention relates to the many different types of carburetors, including those that have only one air channel. However, it is applicable particularly to carburetors of the type which include an auxiliary air channel with an inlet opening and an outlet opening in the main air duct between the throttle valve and the outlet, and this arrangement is such that during operation the fuel is mixed with air flowing through the auxiliary air channel, before mixing with the air flowing in the main air duct. In practice, this means that the outlet of the valve dispensing fuel leads in the support the positive air channel. The carburetors of this type is described in document WO 97/48897. The fact that jet fuel is communicated with the main air channel downstream of the throttle valve, and not upstream from it is regular, and this means that the fuel is forcibly injected from injector fuel supply due to a pressure substantially below atmospheric, which prevails downstream of the throttle valve, in particular at small opening of the throttle valve, i.e. when the engine is running at low speed or at idle. It differs from the pressure upstream from the throttle valve, which is very close to atmospheric. This significant pressure drop leads to a significantly more efficient evaporation of the fuel, in particular at low engine speeds. This improved evaporation contributes to the flow of air through the auxiliary air channel, and this air is mixed with fuel before enters the main air channel, thereby starting the evaporation process earlier than usual. The result of more rapid and efficient vaporization of the fuel is more efficient combustion, and hence reduced fuel consumption and reduced pollutant emissions.

In a preferred embodiment, the fo is sunka fuel supply includes a channel inlet of the fuel communicated with the outlet valve fuel metering, channel release mixture which is connected with the main air channel, and at least one channel air inlet which communicates with the auxiliary air channel and channel release of the mixture.

Injector fuel supply preferably includes a drilled hole with a constant cross-sectional area of the upstream end of which communicates with the outlet for the fuel, and the downstream end of which is rejected, and is communicated with the main air channel. The presence of drilled holes with a constant cross-sectional area means that minimal changes in the depth to which undergoes divergent drilled hole will not affect the cross-sectional area of the communication between the auxiliary air channel and the main air channel.

In an alternative embodiment, within dripped release a mixture of fixed block nozzle, limiting the injector nozzle or nozzles. In practice, it is necessary to channel air release was more than in the previous embodiment, and immediately after the channel is established, the unit injector or unit, restricting the nozzle is inserted into it and locked in the desired position. This again shows the et to the cross-sectional area of the communication between the auxiliary air channel turns out to be precisely specified in advance and therefore are not affected by tolerances or minor changes in the technological process of manufacturing.

To prevent the formation of too small a pressure below atmospheric in the auxiliary air duct when the engine is idling, it is preferable that the minimum cross-sectional area of the auxiliary air channel along its length was greater than the cross-sectional area referred drilled holes with a constant cross-sectional area. This will lead to a substantial proportion of the pressure gradient between the exhaust hole for the fuel valve fuel metering and main air channel that occur between the auxiliary and the main air channels, resulting in excess fuel not absorbed in the auxiliary air channel from the outlet to the fuel when the engine is idling.

Benefit from having an auxiliary air channel is clearly visible, in particular for small and medium numbers of revolutions of the engine due to the significantly increased fuel evaporation. However, when large numbers of revolutions of the engine there is a significant air potencies main air channel, as well as a small air flow through the auxiliary air channel. This can lead to a drop in component ratio of the air-fuel mixture to an undesirable low level at high loads of the engine. This particular problem can be avoided if the auxiliary air channel includes a controlled valve that can be actuated by individual Executive mechanism. This ensures that the flow of air through the auxiliary air channel controlled independently of the air flow through the main air channel. In one embodiment, the controlled valve connected to the throttle valve, and gradually closing as the opening of the throttle valve. This means that when the engine load increases, the flow of air through the auxiliary air channel does not grow with the same speed and in fact may even decrease or subside to zero when the throttle valve is fully opened.

This characteristic is applicable to the carburetor, which does not include the metering valve fuel special type mentioned above, and therefore, in accordance with an additional aspect of this invention, the carburetor includes a main air Kapal, an adjustable throttle valve, loc is defined inside the main air channel, auxiliary air channel with an inlet hole and an outlet hole in the auxiliary air channel, and the arrangement is such that during operation the fuel is mixed with air flowing through the auxiliary air channel, before mixing with the air flowing in the main air duct, characterized in that the auxiliary air channel includes a controlled valve. This valve can be connected to the throttle valve, and gradually closing as the opening of the throttle valve.

In a preferred embodiment, the throttle valve is mounted on the rotary shaft, which passes through a radial channel and the radial channel represents a contiguous portion of the secondary air channel when the throttle valve is essentially closed, resulting in at least pulling the throttle valve radial channel is gradually becoming not aligned with adjacent areas of the auxiliary air channel and therefore gradually throttles the air flow through the auxiliary air channel. This arrangement, in particular, is simple and economical in the space, because the shaft of the throttle valve is used to act as a throttle valve for the auxiliary who is the ear canal.

Additional characteristics and details of the invention will become apparent from the following description of certain specific embodiments, which is given only as an example with reference to the accompanying drawings, in which:

figure 1 presents a perspective image of the front of the carburetor in accordance with the invention;

figure 2 presents a perspective image of the rear of the carburetor according to figure 1;

on figa presents a partial schematic section of a carburetor according to figures 1 and 2;

on FIGU presents similar figa showing a characteristic that is present on the choice of;

on figa and 4B presents a cross-section of the valve of the fuel metering in the closed and partially open positions, respectively;

on figa and 5B shows a longitudinal and transverse section, respectively, of a modified valve dispensing fuel;

on figs presents similar figv, further modified valve dispensing fuel;

on figa, 6B and 6C are top of the carburetor according to figures 1 and 2, illustrating the positions of various components under heavy load, average load, and also when the engine is idling, respectively;

on figa, 7B and 7C presents an axial section of another additional modifier the tank valve dispensing fuel;

on Fig presents a vertical axial section of a carburetor according to figures 1 and 2;

on figa and 9B presents an axial section of one additional modified valve dispensing fuel;

figure 10 presents a perspective image more variant implementation of the carburetor in accordance with the invention with the top cover removed;

figure 11 presents an axial section of a carburetor according to figure 10; and

on Fig presents a promising image rotating caliper, which can be seen in figure 10.

In the drawings, the same reference position indicate identical parts.

Referring first to figure 1-3A, note that the carburetor 1 includes a housing 2, the bounding main air channel 19 with the inlet opening 6 and the downstream exhaust air hole 11. The housing 2 is made with possibility of connection to the air filter housing (not shown) through the flange 3 and the intake manifold of the engine (also not shown) through the flange 4. In the main air channel 19 is located a throttle valve 8 type throttle. Case 2 also limits the auxiliary air channel 13 which communicates with an auxiliary inlet opening 10 and has a downstream end of the outlet openings 24, soobax is the action scene with the camera 22. The chamber 22 accommodates the valve 23 of the dispensing of fuel, which will be described in detail below, and is communicated through two channels 25, fueled by an additional air channel 13, with inlet nozzles 28 of the fuel supply, the outlet of which is directed in the main air channel 19 downstream of the throttle valve (8).

As shown in figa and 4B, the valve 23 of the dispensing fuel preferably consists of an outer sleeve or tube 32 within which a longitudinally concluded slidable valve element 33, which is arranged to move in a vertical direction of the plate 16, as will be explained below. Sleeve 32 limits the space 35 of the fuel inlet at its lower end which communicates with the inlet hole 37 for fuel at its lower end through a non-return valve 30. This valve will prevent any reverse flow of the fuel and thereby reduce the variation of pressure and reverse flow of fuel that may occur and adversely affect the operation and efficiency of the engine. In the side wall of the sleeve 32 is provided for the outlet 39. The valve element 33 has a round cross section through the upper section of its length and is in sliding and essentially a compressed contact with the inner surface of the liners is I. However, at the lower end of the valve element in its surface directed to the outlet 39, provided with a relief or gradually cut down. Accordingly, when the valve element is in the position shown in figa, the discharge opening 39 is completely blocked by the surface of the valve element, and the communication between the space for the fuel inlet and the outlet is completely absent. Therefore, the fuel cannot flow through the valve. However, when the valve element is gradually rises, gradually decreasing the cross-sectional area of the valve element will mean that the space for the fuel inlet communicates with the outlet 39 through the space with gradually increasing in size, and the rate of flow of fuel through the outlet 39 in the direction of the nozzle 28 of the fuel supply will gradually increase. The particular form of the cut out area of the valve element can be defined so that will be achieved at any desired relationship between the valve position and the instantaneous fuel consumption.

In a preferred embodiment, the valve element 33 performs a linear movement within the sleeve 32, although it should be clear that he could make a rotational movement, or to participate is in linear movement, and in the rotation. The valve element 33 also has a round cross-section in this preferred embodiment, and this opens up the possibility, at least theoretically, the rotation of the valve element within the sleeve and loss cut plot of the error angle with the outlet 39. This risk is avoided in a modified embodiment, shown in figa, in which the valve element is provided with an elongated groove 44 in its surface opposite to the outlet 39. The ledge 46, executed as a single unit with a plug 48, passing through the wall of the sleeve 32 extends into the groove 44 and is engaged with the two side walls. Therefore, the rotation of the valve element relative to the sleeve is prevented by guide elements 46, 48.

In the embodiment according to figure 4 the upper portion of the inner surface of the sleeve 32 is a compact sliding contact with the opposite surface of the valve element around its entire periphery, preventing leakage of fuel in the upward direction. However, the valve element does not need to be sealed around its entire periphery, and may be sealed around the outlet 39. In a modified embodiment according figv sleeve 32 of the valve seats sealing element 50, provided the report of the outlet 39, and a semi-cylindrical recess, in which is enclosed the valve element 33. The valve element 33 again has an elongated groove 44, is made in the lateral surface, remote from the discharge outlet 39, and in this groove is enclosed ledge 46 connected to the block 48. The protrusion 46 has a width equal to the width of the groove 44, and is made of elastic material, so he forcibly pulls the valve element to the right, as shown in figure 5. Thus, the valve element 33 is not prohibited from rotation, and he forcibly diverted into sealing contact with the seal 50 by the elastic protrusion 44.

Additional modified embodiment according figs valve element is again provided with a guide 48, 46 extending in a longitudinal groove made in it, and is in sliding contact with the seal 50, which holds the outlet opening 39. The seal 40 is made of a solid polymeric material, such as sold under the trademark RAILS. For seal 50 is one or more magnets 52, that are, for example, ferromagnetic valve element 33 and therefore forcibly take away the seal 500 in contact with the valve element 33, thereby improving the integrity of the seal. In an alternative embodiment, the seal material 50 may contain magnetic particles that PR is Thibaut seal, bringing it into contact with the valve element.

On figa shown that the auxiliary air channel 13 includes a valve made with the possibility of gradually closing as the opening of the throttle valve 8. In this case, the throttle valve includes a Central rotating shaft 40, which passes through a radial air channel 42. When the valve 8 is closed, moving to the closed position, the channel 42 forms a portion of the secondary air channel. However, when the valve 8 is opened, the channel 42 is becoming more and more experience an inconsistency with adjacent areas of the channel 30 and so gradually throttles the flow of auxiliary air through the channel 13. When the valve 8 is in the fully open position, or near, the channel 13 is closed and the auxiliary air will not flow through the channel 13 to the nozzle 28. This will increase the riches of the air-fuel mixture at high engine loads, but will not have a negative impact on the efficiency of fuel injection and evaporation, because under heavy load, the flow of air through the main air channel 19 is fast enough, ensuring rapid absorption and evaporation of fuel released through the nozzle 28.

However, it is desirable to allow a small flow of auxiliary air to flow even in conditions of great the second load, and this is achieved in the design according figa due to the presence of additional auxiliary air channel 13', parallel located upstream section of the auxiliary channel 13 and the bypass valve formed by the shaft 40 of the throttle valve 8.

As mentioned above, the fuel can be changed between the desired maximum and minimum consumption. Maximum flow will correspond to the maximum load of the engine. The minimum flow can be very low, corresponding to the number of revolutions of the engine at idle. However, from the point of view of practical implementation, it is difficult to reliably and accurately control low fuel consumption, the current through the valve, which is also made with the possibility of spending, suitable for engine operation at high speeds. Therefore, the carburetor preferably includes an additional metering valve of the fuel metering valve at idle, which also communicates with the main air channel and configured to supply a small quantity of fuel required for idling. This design is shown in figv, where for clarity not shown auxiliary air channel. As you can see, the air duct 13 for idling reported with vypuskni the hole 11 for air in position, which is located downstream from the adjacent edge of the throttle valve 8, when he essentially closed, but upstream from the throttle valve when it is open to a suitable degree. Air channel for idle communicates with the nozzle 41 for fuel. The air duct 13 for idling is controlled by an adjustable needle valve 45. The main valve 23 dispensing fuel made with the possibility, essentially closing when the engine is running PA idling. At this time, the throttle valve 8 will be in the position shown in figv, and the downstream end of the air dripped 13" for idling will be exposed to a pressure substantially below atmospheric. Thus, the air and fuel are sucked into the air duct in an amount sufficient for engine operation at idle. The exact amount of fuel that is valid, can be very accurately controlled by regulating the needle valve 45, which requires only allow a relatively small range of costs. When the throttle is opened, the main valve 23 dispensing fuel will again begin to pass the stream of fuel. Because the adjacent edge of the throttle 8 is moved downstream from the downstream end of the air channel 13 for idling, gennoe pressure, affixed to the downstream end of the channel 13", decreases, and the flow of fuel and air through the channel 13" drops to very small values, which is negligible compared to the flow through the nozzle 28.

In a modified embodiment, shown in figa, the metering valve at idle is integrated in the valve element of the main valve fuel metering. In this case, the valve element 33 is hollow, and within it lies the needle valve 54, the area of the outer surface of which carries a screw thread, put into engagement with a corresponding screw thread on the inner surface of the valve element, so that the relative axial position of the valve element 33 and the needle valve 54 are easily adjustable. The inlet opening into the space 35 to the inlet of the fuel forms a saddle valve 56, which communicates the needle valve 54. The valve element 33 is again shaped on its outer surface, directed to the outlet 39, to obtain the desired flow of fuel when the valve element 33 is moved in the axial direction inside the sleeve 32, and its rotation is again prevented by contact of the guide 48 in the longitudinal groove made in the opposite surface. When the engine is running at a speed full stroke is, the valve element 33 will be in the position shown in figs, which allowed the flow of a significant amount of fuel through the outlet 39 and the needle valve 54 is taken away from the seat 56 of the valve. When the engine is not running, the valve element 33 will be in the position shown in figv, in which the outlet opening 39 is closed the valve element 33, although it is not necessary, and the saddle valve 56 is completely blocked by the needle valve 54. However, when the engine is idling, as shown in figa, fuel consumption is not controlling valve element 33 and the needle valve 54. Thus, the profiled section outer surface of the valve element 33 is of such shape that when the valve element 33 is moved down, the area of communication between the space 35 and the outlet 39 is gradually reduced, and when this happens, the needle 54 of the first valve does not influence the fuel consumption. However, when reaching the range chisel idle the form of a corresponding part of the surface of the valve element is such that the area of communication between the space 35 and the outlet 39 becomes essentially constant and no longer decreases. However, when reaching this point, the needle valve 54 begins to affect the flow through the saddle 56 CL the pan. Further movement in the downward direction of the valve element 33, and hence the needle valve 54, will lead to lower fuel consumption, but all of this reduction is caused by the needle valve 54. Fuel consumption at idle can be adjusted very precisely by adjusting the position of the needle valve 54 within the valve element 33.

Additional modified version of the implementation, in which the metering valve at idle is integrated in the valve element of the main valve dispensing fuel, shown in figa and 9B. The valve element 33 of the hollow again, and again holds the valve element or needle valve 54, and the position of this needle valve inside the valve element 33 is again regulated by the interaction of screw threads. However, in this case the saddle valve 56, which communicates with the valve element 54 for idling is limited inside the valve element 33. Above the seat 56 of the valve within the valve element 56 is space for fluid communication with the outlet opening 66 in the side wall of the valve element 33. During normal operation of the engine, as shown in figa, the discharge opening 66 is closed, the opposite inner side wall of the sleeve 32, and therefore the fuel is not flowing through the valve formed by the seat 56 and the valve element 54.

However, when Klah the p element 33 is moved downward to the position the corresponding idling, the exhaust hole 66 is aligned with the outlet hole 39 in the sleeve. Then the fuel can flow through the valve 54, 56 dosing for idling, and hence through the outlet opening 66 and 39. Two valve dosing essentially parallel in this embodiment, and the main metering valve of the fuel and therefore made with full closing during idling, and this means that all the fuel required for idling, passes through the metering valve fuel at idle. Since the valve element 54, and the valve element 56 is moved with the valve element 33, the moving valve element 33 does not cause relative movement of the valve element 54 of the seat 56 of the valve, and this means that the flow through the metering valve at idle constant, although, of course, he may be adjustable to achieve the desired values by adjusting the longitudinal position of the valve element 54 within the valve element 33 due to its rotation.

Now, with reference to figures 1, 2, 6 and 8 will be described the mechanism by which the metering valve fuel to operate and manage them. The upper surface of the carburetor carries two parallel elongated rails 60, on which the possibility of gliding is supported caliper 18. During operation, guides, and support are inside a removable cover, but it is not shown in the drawings for clarity. The cover is rotatably mechanical input shaft 12. With the shaft 12 is rigidly connected to the shoulder 61 of the lever with the free end of which hangs stud 62, which lies in a groove 64 in the support plate 18. It should be understood that the stud 62 and groove 64 act as a link with the dead stroke and that the rotation of shaft 12 will cause linear movement of the idle speed of the carriage 18 along the guide rails 60. The rotating shaft 40 of the throttle valve 8 passes through the upper wall of the carburetor and connected without the possibility of rotation with one end of the lever 14. In the upper surface of the lever 14 is a longitudinal groove 67, which concluded slidable elongated slider 68. The end of the slide 68, remote from the shaft 40 of the throttle valve, hinged to the support plate 18 by means of hinge finger 70. The groove 67 and the slide 68 constitute an additional link with the dead stroke, so that the linear movement of the carriage 18 along the guide rails 60 will cause rotation of the shaft 40, and thus to the movement of opening or closing of the throttle valve 8.

The caliper upward climb two spaced apart parallel walls 72, the upper surface 74 one of which is profiled and has the shape of an inclined plane with krivolineynaya. Over shaped inclined plane 74 is elongated shank 76 of the valve, and on one side is a roller 78, based on the shaped inclined plane 74. In the center of the shank 76 of the valve is supporting plate 16, through which passes a valve element 33 of the valve dispensing fuel. The valve element 33 and the bearing plate 16 are connected to each other in such a way that prevents relative vertical movement. Side of the shank 76 of the valve is a flat surface which is in sliding contact with the opposite parallel surface of another bulkhead 72. This planar arrangement prevents tilting or misalignment of the shank of the valve when it is moved along the bulkheads.

During operation, the top of the carburetor is covered with a lid or roof element (not shown), and between the bottom side of the cap and the shank 76 of the valve is provided by a spring (also not shown), forcibly discharge the last down, so that the roller 78 is supported in contact with the inclined plane 74. Input shaft 12 is connected with a control number of revolutions of the engine, usually with speed control stationary engine or accelerator pedal of the motor vehicle so that movement of the control speed will cause rotation of the shaft is 12. When the engine is running at idle speed, the position of the caliper 18 is the one shown in figure 2 and 6A. As will be seen, the roller 78 is in contact with the lower section of the inclined plane 74, and the valve element 33 is in its lower position, as shown in figa and 7A, so that the metering valve of the fuel is essentially closed and the dispensing of fuel is carried out by the metering valve at idle. In this state, the throttle valve 8, essentially, secretase control speed now moves to the intermediate position, the input shaft 12 is rotated and this causes movement of the carriage 18 along the guide rails 60 of the slip. This, in turn, causes rotation of the throttle valve 8 by means of a link 67, 68 with the dead move to the intermediate position shown in figv. The roller 78 is moved to an intermediate position on the inclined plane 74, and the valve element 33 is moved up to the intermediate position, thereby allowing the ingress of larger amounts of fuel into the main air channel of the carburetor. If the control speed is now moved further to a position corresponding to the engine speed at full throttle or full load, the input element 12 is rotated further, and the carriage 18 moves further in point is the situation, shown in figure 1 and 6S. This movement is transmitted to the throttle valve 8, which is translated in the fully open position, which is also shown in Fig. The holder 78 is moved up the inclined plane 74 that moves the valve element 33 up to its highest position, as seen in figv and 7C.

A modified version of the implementation of the carburetor shown in figure 10 to 12, similar to the previous versions, but it differs from them in several important aspects.

In previous versions of implementation, the mixing ratio of the air-fuel mixture in any given position of the valve element 33 is fixed by the manufacturer due to the precise definition of the profile of the valve element. However, as a result of the manufacturing tolerances and progressive wear of the carburetor and associated engine, it may be desirable that the carburetor had an additional means of controlling the component ratio of the fuel-air mixture. This implementation includes an integral control valve 80 located between the float chamber 82 of the carburetor and the intake hole in the metering valve of the fuel, which is a non return valve and a metering valve of a fuel with an electric drive, which during operation is connected with controllermate the controller can be connected with the so-called X-sensor, which measures the oxygen concentration in the exhaust gases. The controller can be programmed to control valve 80 controls so that the oxygen concentration in the exhaust gases is zero, thereby indicating that the mixture is not too poor. The controller may also respond to signals characterizing the oil level in the sump, engine temperature, exhaust gas temperature, and any other desired parameters. The control valve may be any of a number of valves of known types, for example with the valve element oscillating, pulsating or rotating type. The control valve can also be used to precisely control the flow of fuel when the engine is idling.

The sleeve 32 of the valve in this case is enclosed inside the drilled holes inside the housing 2. The outlet 39 in the sleeve 32 reported in the drilled hole 84 in the housing 2, which, in turn, communicates with the nozzle 28. In the embodiment according to figure 3, the nozzle 28 is obtained by drilling from the main air channel 19 in the auxiliary air channel 25. This means that the size of the messages between the two channels, i.e. the size of the opening of the nozzle is very dependent on the depth of drilling, and to determine the size in advance on practicecan difficult. This potential problem is overcome in this embodiment, by using two drilled holes, one of which is relatively small and has a constant diameter, namely, is a reamed hole 84, which communicates with the exhaust hole 39, and the second of which is relatively large and is communicated with the main air channel 19 and the downstream end of the drilled holes 84, and has, in General, conical shape. This means that the minimum size of the messages between the main and auxiliary air channel accurately determined in advance and is equal to the area drilled holes 84.

When the engine is idling, the throttle valve 8 is essentially closed. This means that a very small pressure below atmospheric prevails at the downstream end of the drilled holes 84. Get a large pressure drop creates a tendency towards absorption of larger amounts of fuel through the metering valve fuel than is required for idling. In previous versions the implementation of this was achieved through a very precise machining of the profile of the valve stem to ensure that the available area of the bore when the engine is idling, the tolerance is t absorption just required a small amount of fuel through the valve. However, this potential problem is mitigated in this embodiment, due to selection of the dimensions of the auxiliary air channel so that its area is greater than the area of communication between the main and auxiliary air channels. This leads to the fact that the pressure in the auxiliary air channel does not drop to almost the lowest level, and this means that the pressure drop between the metering valve of the fuel and primary air channel is to a large extent between the main and auxiliary air channels, and not between the metering valve of the fuel and auxiliary air channel. This ensures some relief in terms of accuracy, which should be machining profile of the valve element 33. It should be clear that the increased area of the auxiliary air channel must be present throughout its length, because if somewhere along its length, there was a narrowing, at this point there would be a pressure drop, and this would increase the differential pressure between the metering valve of the fuel and auxiliary air channel. This increased cross-sectional area of the auxiliary air channel can be implemented simply by increasing the whole channel or two or even more quantities of the channels, parallel, at least part of the length of the auxiliary air channel.

As you can see on 11, the inner surface of the sleeve 32 provided with a raised section 86 which extends around the exhaust opening and supports the surrounding portions of the inner surface at a small distance, which may be only 1 mm or have equivalent value. The valve element 33 is again provided with means which rejects it to the inlet the outlet 39. In this case, the deflecting means includes a bracket 48, which is drilled a hole in the housing 2 and restricts the Central drilled hole 8, which is enclosed with the possibility of sliding of the stem, in General, mushroom-shaped deflecting element. Between the head of the deflecting element and the plug 48 is spring 92 compression, which abuts the head of the deflecting element in the valve element 33 and thereby forcibly abut the valve element 33 in the raised section 86. The valve element 33 also made slidable in the support 96, below which is the seal 98. At other points along its length valve element 33 is separated from the inner surface of the sleeve 32. The combination of elevated section 86 and the deflecting device 48, 90, 92 means that the valve element 33 contactyou the t with the inner surface of the sleeve 32 with a high contact pressure, and it improves the integrity of the seal around the exhaust opening 39.

In the previous embodiment, the rotational input connections of the throttle valve is connected with a linearly sliding caliper, whereby the input rotational motion is converted into linear motion of the valve element. However, in this embodiment, the rotating input shaft 12 is connected to the rotating support plate 98, which rotates with the shaft 12. As best seen in Fig rotating caliper has the shape of a circular segment with a non-circular hole 100 near its top, by which it is fastened to the shaft 12. Near its outer arcuate peripheral edge is elongated arcuate hole 102 through which passes the valve element 33. Near the hole 102 and outside it passes partially circular wall 104 gradually increasing height, the upper surface 106 which forms an arcuate inclined surface. This inclined surface 106 in contact with the roller 78, which is connected with possibility of rotation, providing vertical movement of the valve element 33. The upper end of valve element 33 is in contact with the rod mushroom internal contact element 106, which is enclosed within the outer mushroom-shaped contact element 18, which acts as a stop in the downward direction. The stock of external mushroom element 108 is hollow, and it contains and the lower end of the inner mushroom element 106, and the upper end of the valve element 33, which are in contact with each other. The outer surface of rod outer mushroom element 108 is threaded and is engaged with a corresponding internal thread on the housing 2. Thus, the initial position of the valve element 33 can be changed by rotation of the contact element 108 relative to the housing, which leads to a rotational movement of the inner mushroom element 106 relative to the housing, and hence to axial movement of the valve element 33. The upper surface of the inner mushroom-shaped contact element 106 is in contact with one end of the spring IN compression, the other end of which contacts with the outer cover 112. These two contact elements put into contact with each other when the cover 112 is in its place.

There are circumstances in which the carburetor may need to supply metered quantities of one of the two different fuels, such as gasoline and paraffin. This requirement can easily be satisfied by providing the valve element different shaped forms at the two opposite ends, one of which K is the CIO for one of the fuels, and the other suitable for other fuels. Then the carburetor can be easily converted from suitable for a single fuel suitable for other fuel by extracting the valve element from the position in the sleeve, in which one of the profiled forms opposite the outlet, and re-install it in the position in which another form opposite the inlet opening.

It may also be desirable that the carburetor was able to apply exactly the right amount of two different fuels simultaneously, for example to submit the gasoline and lubricating oil in a two stroke engine. This can easily be achieved, by providing the sleeve with two separate outlet holes, each of which interacts with a corresponding profiled section of the valve element, and dividing the space for intake of fuel into two separate space for intake, each of which communicates with the respective inlet and with a corresponding profiled section of the valve element.

1. The carburetor includes a main air channel (19), with the upstream inlet (6) and the downstream outlet opening (11), an adjustable throttle valve (8)located inside the main air duct, the nozzle (28) supply top the willow, chamber connected with the main air channel and connected to the valve (23) dispensing fuel to change the amount of fuel released through the nozzle, and the said metering valve fuel includes forming a channel element (32)which can move concluded valve element (33), thus forming a channel element (32) and the valve element to limit the space (35) inlet fuel inlet (37) for fuel in communication with the space for the fuel inlet, the outlet opening (39) for fuel, passing through the wall forming the channel element (32) and communicates with the nozzle (28) of the fuel, and the plot external surface of the valve element (33), shaped so that the valve element is arranged to move relative to the forming channel element (32) so that the size of the messages between the space (35) for intake of fuel and an outlet opening (39) for fuel changes gradually between the maximum and minimum values, characterized in that it contains an auxiliary air channel (13) with an inlet (10) and the outlet (24) in the main air channel (19) is adjustable between throttle valve (8) and behind the outlet (11) of the main air duct, and the outlet opening (39) for the top of the willow valve (23) of the dosing fuel is communicated with the auxiliary air channel (13), the nozzle (28) of the fuel is communicated with the auxiliary (13) and the principal (19) air channels, so that the fuel can be mixed with air flowing through the auxiliary air channel (13), before flowing through the nozzle (28) and is mixed with air flowing in the main air channel (19) downstream from the adjustable throttle valve (8).

2. The carburetor according to claim 1, characterized in that the nozzle (28) of the fuel is communicated with the main air channel (19) and with at least one channel (25) air inlet which communicates with the auxiliary air channel (13) and outlet opening (39) for fuel.

3. The carburetor according to claim 1 or 2, characterized in that the nozzle of the fuel supply includes a drilled hole (84) with a constant cross-sectional area of the upstream end of which communicates with an outlet opening (39) for fuel, and the downstream end of which communicates with the main air channel (19).

4. The carburetor according to claim 3, characterized in that the minimum cross-sectional area of the auxiliary air channel (13) along its length is greater than the cross-sectional area referred drilled holes (84) with a constant cross-sectional area.

5. The carburetor according to claim 1, characterized in that the auxiliary air channel 13) includes a controlled valve (42).

6. The carburetor according to claim 5, characterized in that the controlled valve is connected with an adjustable throttle valve (8) and gradually closing as opening of an adjustable throttle valve.

7. The carburetor according to claim 6, characterized in that an adjustable throttle valve (8) is mounted on the rotary shaft (40), which passes through a radial channel and the radial channel represents a contiguous portion of the secondary air channel (13), when the throttle valve is essentially closed, resulting in at least pulling the throttle valve radial channel gradually becomes misaligned with the adjacent areas of the auxiliary air channel and therefore gradually throttles the air flow through the auxiliary air channel.

8. The carburetor according to claim 7, characterized in that the auxiliary air channel contains additional auxiliary channel (13'), in parallel located upstream section of the auxiliary air channel (13) and bypassing the valve formed by the shaft (40).

9. The carburetor according to claim 1, characterized in that it includes a non-return valve (30)located between the inlet opening (37) for fuel and space (35) for intake of fuel.

10. The carburetor according to claim 1, characterized in that the valve element (33) is performed with an option or linear movement of the inside forming a channel element (32), any movement during the rotation of the inside forming a channel element (32).

11. The carburetor according to claim 1, wherein forming the channel element (32) is a sleeve containing a sealing element (50), which limits the recess, in which partially enclose the valve element, and forms a seal with it, and which is made, at least part of the outlet opening (39).

12. The carburetor according to claim 11, characterized in that the wall of the sleeve limits the two outlet openings, which communicate with the respective profiled areas of the valve element, and the fact that there are two inlet for fuel, which are communicated with appropriate spaces for the intake, which are communicated with the respective profiled areas of the valve element.

13. The carburetor according to claim 1, characterized in that it includes a valve (54) dispensing fuel at idle, designed for dispensing small quantities of fuel required for engine operation at idle, connected in parallel with the metering valve fuel.

14. The carburetor according to item 13, in which the valve element has a valve (54) dispensing fuel, which interacts with the saddle (56) of the valve within the valve element and the valve seat communicates with the space for the intake and with additional PR is the space inside the valve element, this extra space is communicated with the outlet (66) for idling in the side surface of the valve element, and this is an outlet for idling is located so that it communicates with an outlet opening (39) in forming the channel member when the carburetor is involved in idling.

15. The carburetor according to claim 1, characterized in that it includes a valve (54) dispensing fuel at idle, connected in series with the valve (23) fuel metering and inlet for the fuel communicates with the space for intake of fuel through the seat (56) of the valve, and the valve element (33) valve fuel metering is metering valve of the fuel, which interacts with the saddle (56) of the valve and forms with it an additional metering valve fuel.

16. Respectively indicated in paragraph 15, in which the position of the valve (54) dispensing fuel at idle relative to the valve element (33) is adjustable.

17. The carburetor according to clause 16, in which the composite valve (80) is located upstream of space for dispensing fuel and has an electric actuator, with integral control valve serially connected to the metering valve fuel (23).

18. The carburetor according to claim 1, additionally comprising rotating) the shaft (12), which is made with the possibility of connection with the control number of revolutions of the engine and connected with the throttle valve to move it between open and closed positions and connected to the support plate (98) to move, with the support carries at least one inclined surface (106), which extends in the direction of movement of the carriage and is in contact with the Cam (78)connected to the valve element (33), resulting in the rotation of the input shaft results in movement of the throttle valve and the movement of the carriage, and hence the inclined surface, causing the Cam moves across the length of the inclined surface, and the valve element of the valve dispensing the fuel so too is moved.

19. The carburetor on p, characterized in that it has one or more parallel grooves (60), and the caliper is connected with one or more bearing elements, which rest against the respective lanes, so that the caliper is directed so that makes linear motion.

20. The carburetor according to claim 19, in which the input shaft is connected to the caliper via a link (62, 64) with a dead turn.

21. The carburetor on p, in which a throttle valve is connected to the caliper via a link (67, 68) with a dead turn.

22. The carburetor on p that includes one or more parallel the slope of the s surfaces and the valve holder, which is connected with the valve element and carries one or more rollers, based on the corresponding inclined surface.

23. The carburetor on p, in which the caliper is connected to the rotating input shaft for rotation with it, and the inclined surface has a partially circular shape.



 

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