Gear with rolling engagement in toroidal track

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

 

The present invention relates to a gear with the roller engages in a toroidal path. The invention in particular relates to a device for changing the gear ratio ("progressive") for such transmission, in which each set of rollers, transmission gearing between the input disk and output disk, connected to a hydraulic mechanism, with which the roller position, and the position of the roller is a key factor in setting the reduction ratio.

The variable-speed drives of this type are well known in the art, for example, from GB-C-1395391, GB-A-2107009, EP-A-0078125 and EP-A-0133330. These variators, like most well-known variable-speed drives of this type contain a set of three rollers engaged in the engagement between the rotatable input disc and coaxial with it, the output disc, rotating in the opposite direction; and each roller is separated from the other by 120 in an arc around a common axis of the disks. Its final drive ratio transmitted from the input disk to the output disk each roller, vary by changing the position of the roller in a direction essentially tangential to the Central circle of the General torus formed by the paths of the input and output disks. The mechanism for messages of this tangential movement of at least some of the rollers contains pistons mounted on opposite ends of the bearing roller bearing, i.e. design, carrier bearings, which is installed with the axis of the rollers, and pistons mounted for movement in the hydraulic cylinders.

In known devices the piston-cylinder to control the rollers necessarily protrude from the housing of the variator. Although this circumstance does not cause problems from the point of view of action of the variator, it can be detrimental if the space available for installation of the variator, limited.

In EP-A-0538357 this problem is solved by the arrangement of the cylinders so that they were on the same side of a common plane that includes the axis of the disks. This allows to significantly improve the situation, but still causes a transverse protrusions for piston-cylinder.

In accordance with the first aspect of the present invention created a variator roller engages in a toroidal path that contains:

- input disk mounted rotatably;

- the output disk mounted rotatably and coaxially with the input disk;

- rollers that transmit rotation between the input disk and the output disk;

- positioners, each of which acts on a corresponding one of the rollers;

- levers, each of which is connected with a corresponding one of the rollers and the associated positioner.

Due to the soedineniya via a lever of each of the rollers with the corresponding positioner is much more freedom of choice for positioners, that allows you to create variable-speed drives are more compact design.

Preferably, each roller and its associated positioner were connected with a corresponding one arm. The variator preferably contains a lot of controls that are installed with the possibility of rotation about the first axis. The variator can also include a lever mounted to rotate about a second axis. The second axis may be located at an angle to the first axis.

Preferably, each of the positioners installed from the same side of the plane, aligned with the axis of rotation of the disk of the variator and passing through this axis. More preferably, each of the positioners was installed below a horizontal plane aligned with the axis of rotation of the disk of the variator and passing through this axis.

In the preferred embodiment, each of the positioners have radially outside from the common plane parallel to the axis of rotation of the input and output disks and tangent to the periphery of the larger of the input disk and output disk.

Thus, all positioners can be located next to each other with one side of the variator, which again allows you to create a variator more compact design.

Preferably, the common plane of the passage is La essentially horizontally. Thus, all positioners can be located below the disk of the variator.

Preferably, the common plane passed tangent to the lowest point of the larger of the input disk and output disk.

Preferably, the direction of movement of the positioners were essentially parallel, and it is preferable that the direction of movement of the positioners are perpendicular to a common plane.

In a preferred embodiment, each positioner includes a piston mounted in the cylinder with the possibility of reciprocation.

Preferably, the longitudinal axis of the cylinders were essentially parallel.

Preferably, the piston can be moved by means of hydraulic pressure, and preferably, the cylinders were placed in a common block.

Preferably, the positioner was a double-action mechanisms, i.e. that with their help it was possible to move the roller in either of two opposite directions.

In accordance with the second aspect of the present invention created a variator roller engages in a toroidal path that contains:

- input disk mounted rotatably;

- the output disk mounted for rotation coaxially with the input disk;

Rho is IKI, transmitting rotation from the input disk to the output disk;

- positioners, each of which impinges on a corresponding one of the rollers;

each of the positioners have radially outside from the common plane parallel to the axis of rotation of the input and output disks and tangentially to the periphery of the larger drive input disk and output disk.

Due to the location of all positioners of the above, you can create a much more compact design and more efficient use of available space.

Preferably, the common plane were essentially horizontally. More preferably, the total plane passed tangent to the lowest point of the larger of the input disk and output disk.

Thus, all positioners can be located below the disk of the variator.

Preferably, the direction of movement of the positioners were parallel. For example, the direction of movement of the positioner can be perpendicular to a common plane.

Each positioner may include a piston mounted in the cylinder with the possibility of reciprocation. The piston preferably can be moved by hydraulic pressure.

The longitudinal axis of the cylinder preferably essentially is parallel. The cylinders can be arranged in a common cylinder block.

Preferably, the positioner was the dual mechanisms of action.

The variator can optionally contain a variety of levers, each of which is connected with a corresponding one of the rollers and the associated positioner.

Preferably, each roller and its associated positioner were connected with the respective lever.

The variator preferably contains a lot of controls that are installed with the possibility of rotation about the first axis. The variator can also include a lever mounted to rotate about a second axis. The second axis may be located at an angle to the first axis.

Below are described only as an example, the particular implementation of the present invention with reference to the accompanying drawings, which depict:

Figure 1 is a perspective view of a variant of implementation of the continuously variable transmission is made according to the present invention;

Figure 2 - exploded perspective view of a stepless transmission, are presented in figure 1, with the remote outer casing;

Figure 3 is a front view of a continuously variable transmission, is presented in figure 1, with remote upper case and front drive;

4 is a rear view of a continuously variable transmission, is presented in figure 1, with remote cor the mustache and rear disc;

figure 5-9 - types in term of nodes lever-pulley continuously variable transmission, is presented in figure 1.

In the drawings, represents the unit 10 continuously variable transmission containing the upper outer casing 12 mounted on the lower unit 14 of the cylinder. The housing 12 is placed continuously variable transmission with the roller engages in a toroidal path containing the front and rear input disks 18, 20 and a common output disk 22, and they are all mounted on a common rotation axis.

The input disks are rotated by a drive shaft (not shown)connected to the output of the engine. The rotation of the output shaft is transmitted to the two input disks 18, 20 through a spline connection 24. The input shaft also passing through bearings (not shown)installed in the center of the output disk 22.

Opposite side of the input disk and the output disk is provided with a toroidal surfaces, which form the front and rear toroidal cavities 26, 28. The motion passed from the input disk to the output disk via two sets of roller assemblies (three roller in each set) 30A, 30b, 30c, 32a, 32b, 32c, and in each of the two toroidal cavities 26, 28 is one set 30, 32 of the roller assemblies; and roller nodes in each set are separated from each other by an angle of approximately 120. Each roller Assembly contents is it disc-shaped roller 33, mounted for rotation in roller support 34 by means of trunnion 35.

High mechanical load hydraulically applied to one of the input discs (usually to the rear drive), within which puts pressure on the input shaft, thus causing the clamping rollers 33 between the disks 18, 22 and 20, 22. At the site of contact between the disks and rollers due to shear action by the working environment is transmitted force. When the contact point is subjected to very high pressure, caused by the mechanical load at these points greatly increases the viscosity of the working environment, and oppositedirections characteristics of the environment can effectively convey the leading traction.

In order to transmit the required power between the disks and rollers, it is necessary to provide a reaction force. The reaction force is applied hydraulically to each individual roller, as will be explained below, to ensure that the reactive torque was evenly divided between the rollers, and to create a directly acting means controlled by the transmitted torque.

Power output from the variator is taken from the output disk 22. In the specific embodiment described here, the variator 10 is coaxially variator, i.e. the output power from the output drive select with hollow is Ala (not shown), connected to the output disk and installed coaxially with the input shaft, and guided to the gear together with the movement from the input shaft. In an alternative embodiment, the power output from the variator can be extracted from the periphery of the output disk 22 by means of a chain or belt, covering the output disk.

The signs described above, in General the traditional continuously variable transmission with the roller engages in a toroidal path.

The reactive torque applied to the roller 33 of each roller node using the appropriate one of the six reactive pistons 36A, 36b, 36c, 38a, 38b, 38c double action, each of which is mounted slidable in a respective one of the six cylinders 40A, 40b, 40c, 42a, 42b, 42c provided in the cylinder block 14. The longitudinal axis of the cylinders 40, 42 and, consequently, the axis of movement of the pistons 36, 38 are parallel to each other and, in the described embodiment, all arranged vertically. However, each piston 36, 38 does not act directly on the associated roller Assembly, but instead acts on the lever 44, 46 to which is attached a roller Assembly.

As shown in the drawings, the levers in each cavity is not the same. This allows more efficient use of available space and, thus, provides perhaps the diamonds create a more compact design. Consider first the front toroidal cavity 26 between the front input disk 18 and the output disk 22 from the front side of the node. Thus we see that the first roller Assembly 30A is attached through a universal joint (for example, bearing "Rose") 47 to one end of the arm 44a of the second kind, and the fulcrum of the lever represented the first axis 48 of rotation, on which a lever mounted to rotate through a bearing 50 and rod 52a passing from the jet piston 36A, which is hinged to the lever 44a between the two arms of the lever. Itself the axis of rotation is established between the front and rear bearing brackets 54 on the base plate 56 located on the top surface of the cylinder block 14.

The second roller Assembly 30b is attached through a universal joint (for example, bearing "Rose") 47, to one end of the lever 44b of the first kind, and the fulcrum is made in the form of the axis 48 of rotation described above which includes a lever 44b through bearing 50b. Rod 52b passes from reactive piston 36b connected to rotate with the opposite end of the lever 44b.

The third roller Assembly 30C front toroidal cavity 26 is attached through a universal joint (for example, bearing "Rose") 47 and the connecting lever 45 to the lever s of the third kind, and the connection is sustained fashion the lever passes from the point located between the fulcrum of the lever and the pivot connection of the lever with the rod s passing from the jet piston 36C. The fulcrum provided with a second axis 60 of rotation passing between the two brackets 62 on the upper surface of base plate 56, in which the lever is pivotally mounted by means of bearings 50. Longitudinal geometric axis, the second axis 60 of rotation located in a plane parallel to the plane of the first axis 48 of rotation, but shifted down from it and directed at an angle to it.

In each case, a universal joint 47 is connected to the support 34 of the roller of the roller node.

The rear cavity 28 is also provided with first, second and third roller nodes 32a, 32b, 32c connected to the levers 46a, 46b, 46c. Roller nodes 32a and 32b and the levers 46a and 46b are practically identical roller nodes 30a and 30b and the levers 44a and 44b of the front cavity 26, with the exception of minor differences. Roller Assembly 32C and the lever is identical roller node 30C and the lever s the front cavity. The levers 44a and 44b pivotally mounted on the first axis 48 of rotation by means of bearings 50. The lever is pivotally mounted through a bearing 50 on the third axis 68 of rotation, which corresponds to the second axis 60 of rotation of the front cavity 26. In fact, the position and orientation of the rollers and levers in the front and back cavities 26, 28 are in fact a mirror reflection of what each other relative to the plane, passing through the center of the output disk 22 is perpendicular to the axis of rotation of the input and output disks 18, 20 and 22, except for minor differences in the form of levers in the two cavities.

As shown in the drawings, particularly in figure 3 and 4, all positioning pistons are fully radially outside from the input and output disks 18, 20, 22 of the variator. You can see that all Executive pistons are in the same direction from the plane X1, passing horizontally through the axis of rotation of the disk of the variator. In fact, all pistons are located on the outside (relative to the axis of the variator) from one common plane x2 parallel to the axis of rotation of the disk of the variator and tangent to the periphery of the larger disks (in this embodiment, the diameters of the two input disks 18, 20 and the output disk 22 is equal) and, in this embodiment, passing horizontally.

By connecting each of the positioning piston with its associated roller node through the lever and through the location of all positioners for plane x2 you can choose the position of Executive pistons with much more freedom. As a result, you get a much more compact design.

In fact, all positioning pistons come with one and the same side of the variator, which allows you to create significant is but a more compact design.

1. Variator roller engages in a toroidal path containing the input disk mounted for rotation; an output disk mounted for rotation coaxially with the input disk; rollers for transmitting rotation between the input disk and the output disk; positioners, each of which impinges on a corresponding one of the rollers to control the transmission ratio of the variator; levers, each of which is connected with a corresponding one of the rollers and the associated positioner.

2. The variator according to claim 1, in which each roller and its associated positioner connected to the lever.

3. The variator according to claim 1, containing levers, mounted with a possibility of rotation about the first axis.

4. The variator according to claim 2, containing levers, mounted with a possibility of rotation about the first axis.

5. The variator according to claim 3, containing a lever mounted to rotate about a second axis.

6. The variator according to claim 4, containing a lever mounted to rotate about a second axis.

7. The variator according to claim 5, in which the second axis is at an angle to the first axis.

8. The variator according to claim 6, in which the second axis is at an angle to the first axis.

9. The variator according to any one of claims 1 to 8, in which each of the positioners installed from the same side of the plane, Viron is authorized with the axis of rotation of the disk of the variator and passing through this axis.

10. The variator according to claim 9, in which each of the positioners installed below a horizontal plane aligned with the axis of rotation of the disk of the variator and passing through this axis.

11. The variator according to any one of claims 1 to 8 or 10, in which each of the positioners is located radially outside from the common plane parallel to the axis of rotation of the input and output disks and tangent to the periphery of the larger input and output disk.

12. The variator according to claim 9, in which each of the positioners is located radially outside from the common plane parallel to the axis of rotation of the input and output disks and tangent to the periphery of the larger input and output disk.

13. The variator according to claim 11, in which the General plane runs essentially horizontally.

14. Variable indicated in paragraph 12, in which the General plane runs essentially horizontally.

15. The variator according to claim 11, in which common plane is tangent to the lowest point of the larger input and output disk.

16. Variable indicated in paragraph 12, in which common plane is tangent to the lowest point of the larger input and output disk.

17. The variator according to claim 11, in which the direction of movement of the positioner essentially parallel.

18. Variable indicated in paragraph 12, in which the direction of movement of the positioner essentially parallel.

19. Var is ATOR at 17 or 18, in which the direction of movement of the positioner perpendicular to a common plane.

20. The variator according to any one of claims 1 to 8, in which each positioner includes a piston that is installed with the possibility of reciprocating motion in the cylinder.

21. The variator according to claim 20 in which the longitudinal axis of the cylinder, essentially parallel.

22. The variator according to claim 20, in which the pistons are moved by hydraulic pressure.

23. The variator according to claim 20, in which the cylinders are arranged in a common cylinder block.

24. The variator according to any one of claims 1 to 8, in which the positioners are dual mechanisms of action.

25. Variator roller engages in a toroidal path containing the input disk mounted for rotation; an output disk mounted for rotation coaxially with the input disk; rollers for transmitting rotation between the input disk and the output disk; positioners, each of which impinges on a corresponding one of the rollers to control the transmission ratio of the variator; and each of the positioners is located radially outside from the common plane parallel to the axis of rotation of the input and output disks and tangent to the periphery of the larger input or output disk.

26. The variator on A.25, in which the General plane runs essentially horizontally.

27. areator on p, in which common plane is tangent to the lowest point of the larger input and output disk.

28. The variator according to any one of p-27, in which the direction of movement of the positioner parallel.

29. The variator according to any one of p-27, in which the direction of movement of the positioner perpendicular to a common plane.

30. The variator on p, in which the direction of movement of the positioner perpendicular to a common plane.

31. The variator according to any one of p-27, in which each positioner includes a piston mounted in the cylinder with the possibility of reciprocating motion.

32. The variator on p, in which the longitudinal axis of the cylinder, essentially parallel.

33. The variator on p in which the pistons are moved by hydraulic pressure.

34. The variator on p, in which the cylinders are arranged in a common cylinder block.

35. The variator according to any one of p-27, in which the positioners are dual mechanisms of action.

36. The variator according to any one of p-27, optionally containing levers, each of which is connected with a corresponding one of the rollers and the associated positioner.

37. The variator on p, in which each roller and its associated positioner is connected with the corresponding arm.

38. The variator on p containing levers mounted to rotate consider is Ino the first axis.

39. The variator on p containing a lever mounted to rotate about a second axis.

40. The variator according to 39, in which the second axis is at an angle to the first axis.



 

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