Roller device

 

The invention relates to rollers and cooling during use, in particular to the rollers used in variable-speed drives with toroidal raceway. The roller device includes a roller mounted in the holder, which is equipped with a network of canals. This allows you to apply a cooling fluid, for example oil from the lubrication system of the variator. The coolant can be sprayed on the rim of the roller through the openings in the cage and/or in two specially arranged spray the rods protruding from the holder. The invention improves the efficiency of the cooling rollers. 2 C. and 10 C.p. f-crystals, 6 ill.

The present invention relates to rollers and cooling during use. In particular, it relates, but not exclusively, to the rollers, which must rotate at high speed and under high load from two located opposite to the surfaces which are in contact with the roller at opposite ends of the diameter, thus compressing between them the video. Thus, the present invention relates, in particular, to the rollers used in variable-speed drives with toroidal raceway.

The cooling disks, rollers, and the working fluid in such variators always what must be present in the form of liquid thin film to prevent contact between the metals, to the traction force between the disks and rollers were passed due to the shear forces generated within the thin film. In practice, the waste heat generated inside the film at that moment, when transmitted traction quickly dissipates in the future, when the gap between the raceways and rollers will be deleted specific volume of fluid. As for the drives, thermal conductivity of hardened steel from which they are made, is not too high. However, the total area of each raceway is large compared to the area of immediate contact with its cooperating rollers, and the location of these areas of contact tends to change frequently, because the gear ratio is transmitted by the variator also constantly changing. The usual method of lubrication is sufficient to prevent overheating of the disks.

But very different is happening with rollers: heat is concentrated always on the periphery. The concentration of the incoming heat increases due to the fact that, in practice, the rim of the roller rounded to the transverse radius, thus the instantaneous contact between the roller and the raceway minor, if it is measured in the direction parallel to the axis of roll device for a variable of the specified type, in which the coolant fed to the roller surface through the hollow supporting element of the roller. The coolant passes through a single outlet located opposite the outer surface of the roller, and roller washes coolant.

The aim of the present invention is to provide an improved device for cooling of these clips.

Accordingly, the present invention is a roller device for use in variable-speed drives with toroidal raceway, which contains a roller mounted in the holder, and the pipeline for supplying a flow of cooling liquid to the roller to remove the heat from the roller during operation of the device, and the pipeline has two oppositely arranged outlet openings for directing the cooling fluid to the opposite side of the roller.

Preferably, the outlet openings are a pair of outlet openings in the cage roller, which are designed for directing coolant to the outer surface of the contact roller.

Mostly every nozzle comprises two holes, each of which is located at an angle relative to another of the holes in the direction of the e preferred embodiment, the holes are angled relative to each other for directing coolant flow up and downstream from them.

In alternative or another embodiment of the present invention, the device includes one or more spray bars located radially at a distance partially around the roller.

Preferably, each of the spray rod contains a lot of outlets for directing coolant to the video.

Outlet contain preferably a nozzle for directing the flow of the cooling liquid on the roller.

In a particularly preferred embodiment, each of the spray rod is located so as to direct the coolant to the point of contact of the roller with the other part of the device or close to it.

Each spray rod is located for directing coolant to the point where the roller loses contact with the said other part of the unit, or near it for best results.

The coolant is usually served from a lubrication system of the device in which it is placed during use.

The present invention is a roller device designed for use in variable-speed drives with toroidal raceway, and the device comprises a roller located within a housing soedinen with the yoke, and having a through channel for supplying cooling liquid to the roller, and the shaft has an end surface that is open to achieve the effect of increasing the pressure of the coolant fluid, and the piston dual-action has an opposing surface which is also open to obtain the effect of increasing the pressure of the coolant, thus the opposite effect on the opposing surface of the piston double-acting resists, at least partially, any axial load on the shaft.

Mostly mutually opposing surfaces act so that they form a cavity into which is fed the liquid, and the device also includes an axially located discharge piping, projecting into the cavity to feed her coolant.

Accordingly, the present device also includes an axially located channel in the piston double-acting, used for receiving the fluid, and it can move relative to the feed line to simplify the fluid in the cavity regardless of the axial position of the piston.

Now variants of the present invention will only be described for example with reference to the attached certech with toroidal raceway (not shown);

Fig.2 is a view in axial section of the present device and alternative constructions roller device;

Fig.3 is a partial view, in cross section, in the direction of the arrows x-X of Fig.2, showing the first variant of the arrangement of the outlet;

Fig.4 is a partial view, in cross section, in the direction of the arrows x-X of Fig.2, showing another variant of the arrangement of the outlet;

Fig.5 is a view in cross section of an alternative form of roller device; and

Fig.6 is a schematic view of the variator in which you can apply the rollers according to the present invention.

In roller device 10 shown in the drawings, the roller is indicated at position 12, and the bearings by which it is mounted for rotation on the Central shaft 17 in the bearing holder, indicated by the positions 14, 15. Supporting element holder 19 of the roller attached to section 21 of the rod. In turn, the rod 21 is held at its near end 21A of the ball pin 23 in the piston 25 of the cylinder 27 of a known type to control the roller. The movement of the piston is achieved by changing the pressure on either side of the piston. Near the end 21A is opened and moves within a hollow sleeve 29, which is received by the appropriate installation is in place (see Fig.2).

In Fig.2 can be seen that the yoke roller 19 and the piston rod 21 of the piston have a network of channels 33. This allows you to apply a cooling fluid, for example oil from the lubrication system of the variator shown schematically position 50, through the installation hole 32 and then through the ferrule 19 of the roller in two outlet openings 35, 36 adjacent to the rim of the wheel.

Preferably the outlet is formed as a nozzle, which may form a jet or stream of cooling liquid and direct it to the appropriate portion of the roller 12. Although in Fig.2 shows in cross section a simple tapering nozzle, however, it should be clear that it is possible to use nozzles of various configurations and that the final form of the nozzle depends on the structure of the flow.

But in the preferred embodiment shown in Fig.1, the roller device has an alternative or in addition, two well-known spray rods 38, 39 arranged partially around the rim of the roller downstream from the (constant) 41 points of contact of the rim of the roller with input and output drives variable-speed drives, both of the spray rod preferably end end nozzles or holes 40 acting to direct the flow of ohlazhdeniya. As shown, the nozzles are located near the point at which you want to direct the flow of coolant and to create discrete fluid flow. Such a device provides a particularly effective way of cooling the surface of the roller and, therefore, is useful, when you want a higher cooling rate. The coolant flows generated by the spray bars 38, 39 during operation of the device, indicated schematically by dashed lines in Fig.1. The advantage is also achieved that the nozzles 35, 36, shown in Fig.2, are located close to the surface 41 of the roller and they are formed preferably in the form of nozzles, creating a thread.

Refer now to Fig.3 and 4, showing that the simple form of the present invention, i.e. the device without spray rods 38, 39, it is possible to apply a number of devices with nozzles or holes. For example, you can use the device shown in Fig.3, in which the opposite sides of the casing 19 (see also Fig.2) installed a pair of mutually oppositely arranged nozzles 35, 36 for directing a jet or stream toward each other so that the cooling liquid is deposited on the surface 41 of the roller 12. As shown in Fig.4, the Fig.4, on each side of the clip 19 is a pair of nozzles 35A, 35V, 36A, 36V. Each nozzle of the first pair 35A, 35V installed at an angle relative to each other so that they direct the fluid flow to various parts of the roller 12. Preferably the nozzles of each pair are mounted at an angle relative to each other so that one nozzle directs the fluid flow upstream of their location, while the other directs the fluid downstream from it. The other pair of nozzles 36A, 36V installed and directed in the same way. Although the true angular position depends on the specific requirements of the device, but found that the installation of a single nozzle upstream at an angle of about 30to the longitudinal axis of the node of the roller bearing, and the other nozzle is downstream under the same angle provides effective cooling without excessive diffusion to the contact of the jet with the surface 41 of the roller. However, to a person skilled in the art are presented other opportunities. You can also use a combination of nozzles shown in Fig.3 and 4.

Fig.5 shows another form of the node of the roller bearing 10, which is essentially the same as in Fig.2, except priklauso liquid is served in the inner cavity 33 of the rod 21 through the axially located the supply pipe 62. This pipeline is equipped with o-ring seal 64, which prevents the infiltration of liquid into the zone in which it can act on the middle end 21A and influence the axial position of the roller. The supply pipe protrudes into the cavity 61 formed between the end 65 of the rod 21 and the opposing surface 66 of the piston 25 double action. It is clear that when the supply pipe is in part 25 of the piston roller mechanism, the fluid pressure will act on the surface 65, but its effect will be to counteract the pressure on the opposing surface 66, which is part of the node 25 of the piston. Any effect that may have a coolant under pressure to the axial position of the roller device can be reduced or excluded by appropriate machining of the two opposing surfaces 65, 66. Because of the presence of end surface 68 on the feed line will be marked effect a slight movement, but it can also reduce or even eliminate through careful design. As shown in Fig.5, the supply pipe 62 is held axially in axially located channel formed in the piston double acting 25, which thereby ensuring effective supply of fluid in the cavity regardless of the axial position of the piston 25.

Let us now turn briefly to Fig.6, in which the variator with the proposed higher roller device comprises a pair of input drive roller 62, 64 and a pair of output drive roller 80, 82, all of which are installed on the control shaft 70 in a known manner. Therefore, they will not be described further. The first end 70A of the shaft is, for example, motor vehicles, and its rotation is transmitted to the output disks 80, 82 through the input disks and the rollers 12 located between them. The output disks 80, 82 are connected by a chain drive 71 with planetary gearbox (not shown), which, in turn, results driven shaft 72, which is connected, for example, with transmission of the vehicle. Driven gear 74 mounted on driven shaft 72, is able to engage, through the clutch with the clutch shaft, and she engages with being in constant mesh gear on the control shaft 70, thereby providing a direct drive of the driven shaft, if required. This variable has a normal form, except as described and shown in Fig.1-5 roller devices.

Claims

1. Roller device for use in CVT with toroidal fluid to the roller to remove the heat from the roller during operation of the roller device, moreover, the pipeline includes at least two outlet openings intended for the direction of coolant on the oppositely located side of the roller, wherein the pipeline includes two or more spaced mutually opposite outlet openings arranged at an angle to each other for directing coolant flow to various parts of the outer contact surface of the roller.

2. The device under item 1, characterized in that two spaced mutually opposite outlet openings formed on the clip.

3. The device under item 1 or 2, characterized in that the holes are angled to each other to supply the coolant to the outer contact surface of the roller in the direction of and against the direction of rotation.

4. The device under item 1, characterized in that it comprises at least one spray bar, which is located partially around, but at a radial distance from the outer contact surface of the roller.

5. The device according to p. 4, characterized in that at least one of the spray rod includes a variety of outlets.

6. Device according to any one of the preceding points, however, that at least one of the spray rod is located so as to direct the coolant to the point or near it, in which the roller forms or loses contact with the other part of the variator.

8. Device according to any one of the preceding paragraphs, characterized in that the coolant flows from the lubrication system of the variator in which the specified device.

9. The device under item 1, characterized in that the holder is operatively connected through a rod with a piston double-acting cylinder control roller, and the rod has a channel passing through it, for transporting the cooling fluid in the pipeline, and the rod has a face surface that is open to effect a pressure of the coolant fluid, and the piston is double acting and has opposing surface, also open to supply pressure of the coolant, and the end surface of the rod and the opposing surface of the piston facing each other.

10. The device according to p. 9, characterized in that the mutually opposing surfaces form a cavity, which serves the coolant, and the device also includes an axially located discharge piping, projecting into the cavity, d is Ino passing channel in the piston double-acting for receiving fluid, the piston is arranged to move relative to the feed line to simplify the fluid in the cavity regardless of the axial position of the piston.

12. CVT with toroidal raceways containing one or more roller devices according to any preceding paragraph.

 

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FIELD: mechanical engineering.

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