Variator for a continuously variable transmission with a transmission roller for a toroidal cross-country surfaces

 

(57) Abstract:

Usage: machinery, devices for stepless change gear ratio. The inventive variable contains the input and output disks with toroidal surfaces and the rollers, each of which is in the diametrical direction overlaps the gap between the respective input and output disks. The center of each roller is installed with the possibility of limited movement forward and backward along the Central circumference of the toroidal gap. The variator fitted with locking means located adjacent the inner and outer edges of the toroidal surfaces of the input and output disks and prevents the exit roller over the edge. 9 C. p. F.-ly, 3 ill.

This invention relates to variable-speed drives, i.e. to elements of the change gear ratio in the gearbox, where the tractive force is transferred by the rollers in toroidal cross-country surfaces. It is known that in such variators grouped rollers variable orientation transmit tractive force between the agreed partially toroidal treadmills that are formed on opposite surfaces coaxially rotating in opposite to the disk occurs with a change in orientation of the rollers: if the rollers are in contact with the input disk on a relatively large radius, and output on relatively small, the output disc rotates faster than the input, and say that the variator is set on a large gear ratio, if the rollers are in contact with the input disk on a small radius and with an output, the output disk rotates more slowly, and the variator is mounted on a small gear ratio. A similar variable was cited in many of the patents granted in our century, for example in patents US-A-1056292, GB-A-1078791 and relatively recent W 090/05860. More specifically we can say that this invention relates to variable-speed drives with traction rollers in toroidal cross-country tracks, with the following two properties. First, the rollers overlap partially toroidal gap almost diametrically between the respective input and output disks, when the center of each roller lies almost at the imaginary center of the surface of the circumference of the torus. Therefore, this invention relates to variable-speed drives the so-called "fully-toroidal type, examples of which serve all three of the above patent descriptions, and are not progressive so-called "polutoraminutnogo" type, which have completely different problems going to variators fully toroidal type, in which, as in the description of the patent W 090/05860, the center of each roller during normal operation of the variator should be free, and while changing the gear ratio must make some move forward and backward in a circle at the center of a circle of the torus. The invention does not relate to a different type of toroidal variable-speed drives with a treadmill, which was exemplified by the description of the patent specification GB-A-1069874, in which the center of the rollers is limited to one place at the center of a circle of the torus.

On the schematic Fig. 1 and 2 of the number of the attached drawings shows some of the features and elements of the variator of the type to which this invention relates. Figure 1 shows a view in a plane at right angles to the axis of the disk, as in Fig. 2 shows a view in the plane, where are these axes. As can be seen from Fig. 1, the roller may rotate about its center mounted on the carriage connected with the piston D, walking in the cylinder E. the Roller And transmits the pulling force from a partially toroidal surface F, formed on the disk G, corresponding to a treadmill N formed coaxially on the disk J. the examples provided in the description of the patent W 090/05860, the piston D not only does moving along the axis of the cylinder is ri any control movement of the roller And due to the movement of the piston D within the cylinder E to happen offset of the center roller. From Fig. 2 best shows that as the roller And overlaps the toroidal gap in diameter, the center should make a move on the center of the circle To the Torah. From Fig. 1 also shows that the line of action of the piston D to the roller And lies at an angle (L) to the plane M, which is the circle K. the Angle L is also called the angle of inclination, and it exists in many variable-speed drives of this type, including the examples discussed in the description of W 090/05860.

One of the well known methods of variable-speed drives for continuously variable transmission CVT with toroidal treadmills, where there is a tilt angle, is the property of one-way. In other words, a certain change of the gear ratio while changing the orientation of all of the rollers is possible only when the input disk or disks rotate in the same direction of rotation about the axis of the variator, and the output disk or disks in the other. The reason for this phenomenon is well known, in short it is due to the fact that the geometric ratio when mounting clips included angle shown in Fig. 1. It is therefore important that the input shaft of the CVT continuously variable transmission of this type in no way revolved ago.

In practice the aqueous type, calculated only on the backward motion, which can occur for example in the case of return to the equilibrium position when the masking engine, insufficient for tilting the orientation of the rollers in the previous generations of toroidal variators tracks, because it is unlikely that for all time there will be one turn ago. The variable-speed drives of this type have the characteristic of operation in which the input disk or disks had to make several revolutions to happen change the orientation of the rollers. The reason that originated the invention, associated with the advent of more modern hydraulic suspension system and control rollers, described for example in patent W 090/05860 when significant changes the orientation of the rollers occurs much faster for a small interval of the rotation of the input disk or disks. Therefore it is necessary to reckon with the possibility of rapid and unpredictable change the orientation of the rollers, when they can even jump out with the tracks on the input and/or output disks within one turn of the input shaft ago that may occur when the silencing of the engine or after his unsuccessful run, as well as to protect yourself from this phenomenon.

The essence from the e, now let's proceed to the invention on the example of its implementation with reference to Fig. 3 of the attached drawings, which shows a simplified view of the variator in axial cross-section, and some features are depicted only schematically.

The variator has an input shaft 1, one end of which is provided by the slots 2 for rotation from the engine 3 around the axis 6, on opposite ends of the input shaft has two input disk 4 and 5. Disc 4 is fixed and cannot move either along the axis or rotation relative to the shaft. Disc 5 also cannot make relative rotation, but due to the keyway 7 may perform limited axial movement, as the disk 5 acts as a piston within the cylinder 8 connected to an appropriate source of hydraulic energy 9, creating the necessary and ordinary "end load" on the variator.

Between the disks 4 and 5 is the output element 10 of the variator consists of two output disks 11 and 12 located on opposite sides of the gear 13, the output node 10 is rotated relative to the shaft 1 on the bearing 14.

As usual, the variator is provided by the rollers 20 mounted to the other stakeholders tracks 22, educated at the input disks 4 and 5, and complentarity to them tracks 23 formed on the output disks 11 and 12. In the figure between the disks 4 and figure 11 shows only one group of the roller and carriage 20/22, as well as existing between the disks 5 and 12, whereas in practice between each disk group are usually provided with three rollers spaced from each other at an angle of 120oin an arc around the axis 6, and, as proposed in patent publication W 0/05860, to control the orientation of all six rollers uses a common hydraulic control system (see 25-27), guaranteeing the availability of the same gear ratios in any given time. As on Fig. 1 and 2, the center 20 of each roller may be placed only on an imaginary circumference 22A of the centre of the torus cross-country tracks 22 and 23, however, is under the influence of the control mechanism, similar to the combination of a piston and cylinder D and E in Fig. 1 and 2, makes limited move forward and backward through this circle.

In many publications on systems hydraulic control rollers, for example, in the descriptions of the patents GB-C-2023753, EP-B-013333 and EP-A-0354013, it is noted that the hydraulic circuit 25, which is the management of the carriages 21 and sledai pistons 27 are approaching the end of the valid stroke with the to balance hydraulic pressure on both sides of the piston and to oppose the further advance of the piston in the direction of the end of the stroke and the next. If the hydraulic energy is removed, for example, when the silencing of the engine at the end of the work or failure in the ignition system when starting, the hydraulic brakes are not working. If under these conditions the output shaft of the engine will turn back even in a small degree, for example one-half turn, the combination of a fast roller reaction with unpredictable roller movement caused by the rotation of the input shaft in the opposite direction, can lead to such dramatic changes in the orientation of the rollers inside the variator that there is a danger of slipping floor panels at the edges of the tracks 22 and 23. According to this invention to prevent slipping of the rollers at the edges of the tracks provides the physical fence. On the radially inner edges of the input paths 22 are provided stoppers 30 formed by the bushing 31 mounted on the input shaft 1 and held in place with clamping ring 32. For the input paths 23 are provided similar to the stoppers 33 on the bushings 34, coupled with the rims 35 of the Central cavity to the s and that they rotate in the same direction about the axis 6, as the discs with which they are associated, thereby reducing the relative velocity at the point of their contact with the rollers. If the stopper 33 is similar to the stopper 30 is installed on the axis 1 of rotation of the discs 11, 12 and the shaft 1 in the opposite direction between the roller 20 and the stopper 33 could be significant relative movement when entering while passing in contact. Instead mounted around the input shaft 1 can be provided and a different arrangement of blocks that perform the same functions as the elements 30. For example, they may be integral with the disks or to seal otherwise.

On the outer edges of the input (4, 5) and output (11, 12) drives a similar snap action perform the ring-fence 40, 41. They can be integral with the disks, but in the figure they are represented as separate components, planted on the outer rim of the disks. They provided step 42, preventing the adhesion of the fence with roller with subsequent removal of fences with discs on which they are installed. In addition, the fence on the right picture disc 5 acting as mechanical loading of the piston, as mentioned above, is formed by the groove 43, which is placed an annular UCAV relatively rigid construction of the variator arranged that can make some movement forward and backward along the circumference 22A, the presence of the brakes on only one of the two radial edges of the track may not be sufficient, because if any roller will come into contact with such a stopper, the contact point will be for the roller fulcrum, causing the opposite end of the clip will jump over unshielded opposite edge of the opposite disk.

As usual, the roller 20 on the end has a rounded 50 with a radius of 51, which is much less than the full radius 52 of the roller 20, for greater expressiveness rounding the roller 20A in the figure to the right depicts exaggerated. Rounded end 50 of roller passes in the flat surface 36 at the edge 55, so the curvature of the working surface 53 of the enclosures 40 and 41 is convenient to choose taking into account the curvature created by the edge 55, when the roller at the approach to one of the limits of permissible gear ratio will seek to transition to a higher gear ratio, which lies outside the valid range. Note that when the roller is near the limit of the allowable range, as indicated above, the axis 54 of the roller generally intersects the axis of the variator 6. Therefore, the choice of scope of curvature of the working surface the rollers move at the limit of the allowable range, to reduce the size of the residual gap in the ring at the treadmill, which must be provided at the border of the radius, at which the contact roller and the track on the specified limit position before the fence.

1. Variator for a continuously variable transmission with the transmission rollers on toroidal surfaces containing the input and output disks with toroidal surfaces and the rollers, each of which is in the diametrical direction overlaps the gap between the respective input and output disks, the center of each roller is mounted for limiting movement forward and backward along the Central circumference of the toroidal gap, characterized in that it is provided with retaining means located adjacent the inner and outer edges of the toroidal surfaces of the input and output disks and prevents the exit roller by the edges.

2. The variator under item 1, characterized in that the locking means is made in the form of a ring mounted on the outer edge of the toroidal surface.

3. The variator on p. 2, characterized in that the ring is integral with the disk.

4. The variator on p. 2, otlichayusta at least in one direction.

5. The variator on p. 4, characterized in that the input drive is a hydraulic piston end of nagruzhatelya and piston seal is located on the ring.

6. The variator on p. 2, characterized in that the contact with the toroidal surfaces of the rims of the rollers rounded and forming the working surface of the ring, which gets the clip when going beyond the limits, corresponds to the curve formed by the contour of the roller beyond the specified limits.

7. The variator under item 1, characterized in that the locking means which prevents the exit roller at the inner edge of the toroidal surface, installed with the possibility of periodic engagement with the end surface of the roller, tending to the output for the specified limits.

8. The variator under item 7, characterized in that the locking means associated with the disc rotating together with passing through the center of the variator shaft, located on the shaft.

9. The variator under item 7, characterized in that the locking means associated with the disc, made in the form of a ring and rotating in a direction opposite to the direction of rotation of the Central shaft of the variator with a gap relative to him, raspologen under item 1, characterized in that the rollers are connected with their control mechanisms connecting elements, arranged at an angle to the plane of the Central circumference of the toroidal gap.

 

Same patents:

FIELD: mechanical engineering.

SUBSTANCE: friction toroidal variator comprises inlet disk (2) and outlet disk (3) provided with toroidal surfaces, friction roller (5), spider whose one axle is provided with roller (5), holder (8) of friction roller, control mechanism, and mechanism for control of gear ratio. The second axle of the spider is fit in holder (8) of the friction roller that can rotate around the main axle of the variator. The control mechanism and mechanism for control of gear ration are made of gear sector (9) that rotates on the second axle of the spider secured to the first axle of the spider and housing (12) by means of worm gearing and spring (15) secured in housing (12) and connected with holder (8) directly or through the reduction gear.

EFFECT: simplified control and control of gear ratio.

8 dwg

FIELD: mechanical engineering.

SUBSTANCE: device comprises casing (160) mounted in the vicinity of roller (100) and pipeline for supplying fluid. Peripheral section (162) of the inner side of casing (160) is positioned close to the outer periphery of the roller. Two radial sections of the inner side are in the vicinity of appropriate side surfaces of roller (100). As a result, a chamber for supplying fluid is formed between roller (100) and casing (160). The pipeline for supplying fluid is mounted for permitting supply of fluid to the chamber for receiving fluid.

EFFECT: enhanced reliability.

14 cl, 10 dwg

FIELD: machine engineering, namely variable speed drives with continuously changing relation of revolution number of driven and driving shafts.

SUBSTANCE: friction tore ring type variable speed drive includes driving and driven discs made of set of rings 2, 3 forming together toroidal surface and joined with driving and driven shafts 1, 4 through tie rods 12, 16 at spring-loaded gap outside aid tie rods. Rings 2, 3 may move one relative to other and relative to driving and driven shafts along splines in parallel to main axis of variable speed drive. Ball 10 is used as frictional intermediate member between them; said ball transmits rotation of rings of driving disc to rings of driven disc and it rotates in holder 5 in direction set by means of rings and around main axis of variable speed drive. Actuating mechanism successively forces mutually opposite rings of driving and driven discs for providing their friction contact. Monitoring and control mechanism includes control gear wheel 8 working in pair with ring-like gear wheel 7 secured to holder 5; flat coiled spring whose one end is joined with housing and whose other end is joined with holder 5 or with control gear wheel 8.

EFFECT: improved design, simplified process for monitoring and controlling gear ratio.

5 cl, 7 dwg

FIELD: machine building.

SUBSTANCE: variable-speed drive unit comprises master and slave toroidal wheels (2, 3) and roller (6). Their generatrices are made in the form of convex and concave curved surfaces. Due to arrangement of generatrices of working surfaces in master and slave elements in accordance with a certain dependence, area of friction pairs contact is increased.

EFFECT: improved kinematic characteristics of variable-speed drive unit.

3 dwg, 1 tbl

FIELD: machine building.

SUBSTANCE: invention relates to device for changing of transmission ratio, particularly to gears with rolling engagement in toroidal track. Variator contains input disk (18, 20), installed rotary; output disk (22), installed rotary co-axial with input disk (18, 20); rollers (30, 32), by means of which it is passed rotation between input disk and output disk; pistons (36, 38) of double-acting, each of which interacts on corresponding one of rollers. Variator also contains levers (44, 60), each of which is connected to corresponding one of rollers (30, 32) and connected to it positioner (36, 38), influencing on roller for control of transmission ratio of variator.

EFFECT: creation of considerabl more packaged design of variator.

40 cl, 9 dwg

FIELD: machine building.

SUBSTANCE: invention relates to rolling variator, particularly to control mechanism by roller orientation. Device of infinitely variable control of reduction ratio (variator) contains couple of rotating rolling path, installed for rotation around its common axis (218) of variator. Drive force is passed from one rolling path to the other by means of at least one roll (200), running by it. Connection between roll (200) and its carrier (214) provides roller precession relative to around axis (228) of precession, where it is defined relative to axis of precession and non-parallel to roller axis. Precession leads to changing of angle between axis (222) of roller and axis (218) of variator and corresponding to changing of reduction ratio. Carrier itself allows toothing (206), by means of which it is engaged with central tooth gear (212) and gear rim (214). Rotation of carrier (204) around axis of carrier serves to changing of axle orientation (228) of precession and accompanied by changing of reduction ratio of variator.

EFFECT: invention provides by means of control of displacement of carrier to change reduction ratio of variator.

16 cl, 21 dwg

FIELD: machine building.

SUBSTANCE: variator transmission consists of input shaft (18), input disk (10) installed on input shaft and rotating with it and output disk (12) facing input disk and coaxially rotating with it. Input and output disks (10, 12) form a toroid cavity between them. In the toroid cavity there are positioned only two rollers; also the first and the second rotating rollers are arranged on the first and the second roller carriages. Facility (34, 36) of end load holds rollers down to contact with the input and output disks for motion transfer. Two roller carriages are mounted on opposite sides from the axis of lever pivot. Pivot axis of the lever travels in one, preset radial direction relative to rotation axis of input and output disks.

EFFECT: simplified and inexpensive variator.

27 cl, 3 dwg

Variator // 2413888

FIELD: machine building.

SUBSTANCE: variator consists of two races made for rotation around common axis. Opposite profiled surfaces of races restrict circular space containing at least one roller (38) transferring driving force between races. The roller is installed on the carrier (42) so, that its incline to common axis can vary to facilitate changes of variator ratio. The rollers and their carriers are controlled by means of a mechanism consisting of solar (46) and circular (50) gears interacting with the carrier. Relative rotation of the solar and circular gears causes an incline of carrier (42) so, that rollers turn to a new incline. There is disclosed satellite (100) controlling solar and circular gears and interacting with both. Rotary position of the carrier is controlled independently from its interaction with solar and circular gears.

EFFECT: improved control of rollers orientation.

16 cl, 11 dwg

FIELD: machine building.

SUBSTANCE: device consists of control part actuated by user for control of ratio (lever (50) and of device of working connection (rollers (18) of control part for regulation of ratio with movable part for transfer of variator torque. The connecting device corresponds to a hydro-mechanical arrangement. When a user actuates control part (50) for regulation of ratio there is regulated ratio of variator. The device also has the appliance for turning torque off (valve (60) actuated by a user for disconnection of the part for regulation of the ratio from the movable part for transfer of torque.

EFFECT: simplification of design.

17 cl, 3 dwg

FIELD: transport.

SUBSTANCE: invention discloses planetary variator, combination of reverse variable transmission system comprising these planetary variators, hydraulic system for reverse variable transmission control and method for this hydraulic system regulation.

EFFECT: higher engine efficiency due to lower specific fuel consumption.

12 cl, 13 dwg

Up!