JP2016217507A - Single cavity type toroidal continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single cavity type toroidal continuously variable transmission capable of reducing the dimension in an axial direction and weight of a variator.SOLUTION: A pressing mechanism 20 of a single cavity type toroidal continuously variable transmission includes: a recess 50 provided on the back surface of an output side disc 3 so as to be recessed in an axial direction; a bearing ring 46 provided at the recess 50, and constituting a thrust bearing 45; and a hydraulic chamber 51 provided in an oil tight manner between the bearing ring 46 and the bottom surface of the recess 50. With this structure, the pressing mechanism 20 can be housed in the recess 50. Consequently, in comparison to conventional ones, the axial direction of a variator 10 can be reduced, and since a cam disc, a cam roller, a cylinder and the like conventionally used are eliminated, in comparison to the conventional ones, a weight can be reduced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a single cavity toroidal continuously variable transmission that can be used in transmissions of automobiles and various industrial machines.

  A single-cavity toroidal continuously variable transmission mainly used as a transmission for automobiles is sandwiched between an input disc and an output disc each having a concave cross-section with arc-shaped surfaces facing each other. A toroidal transmission mechanism (variator) combined with a rotatable power roller. The input side disk is drive-coupled to the input shaft so as to be able to move in the direction of the input axis for inputting torque, and the output side disk is rotatable relative to the input shaft and is separated from the input side disk. It is mounted opposite the input side disk so that movement in the direction is restricted.

  In such a single cavity type toroidal continuously variable transmission, when the input side disk rotates, the output side disk rotates via the power roller, so the rotational motion input to the input shaft is transmitted to the output side disk, It is taken out from the output gear that rotates integrally with the output side disk. At this time, the inclination angle of the rotation axis of the power roller is changed so that the peripheral surface of the power roller contacts the vicinity of the outer periphery of the input side disk and the center of the output side disk, respectively, thereby increasing the rotation from the input shaft to the output gear. On the contrary, by changing the tilt angle of the rotation axis of the power roller so that the peripheral surface of the power roller is in contact with the vicinity of the center of the input side disk and the outer periphery of the output side disk, respectively. Deceleration from the input shaft to the output gear is performed. Further, an intermediate gear ratio can be obtained almost steplessly by appropriately adjusting the inclination angle of the rotating shaft of the power roller.

  Further, in such a single cavity toroidal continuously variable transmission, an output side bearing provided behind the output gear for supporting a thrust load applied from the output side disk, and the output side disk side end portion of the input shaft An input side bearing that supports a thrust load applied from the input side disk, and presses at least one of the input side disk and the output side disk in a direction in which the input side disk and the output side disk are brought close to each other. And a pressing mechanism.

As an example of such a single cavity type toroidal continuously variable transmission, those described in Patent Document 1 and Patent Document 2 are known.
As shown in FIG. 3, the single cavity toroidal continuously variable transmission described in Patent Document 1 is loaded on the back side of the input side disk 2 as a pressing mechanism that presses the input side disk 2 against the output side disk 3 side. A cam mechanism 6 is provided. The loading cam mechanism 6 includes a cam disk 4 and a cam roller 5. The cam disk 4 is spline-engaged with the input shaft 1, and the cam roller 5 is provided between the cam disk 4 and the input side disk 2. The cam roller 5 rolls on the cam surfaces provided on the cam disk 4 and the input side disk 2, thereby pressing the input side disk 2 toward the output side disk 3.

  Further, as shown in FIG. 3, the single cavity toroidal continuously variable transmission described in Patent Document 2 is a pressing mechanism that presses the input side disk 2 against the output side disk 3 side on the back side of the input side disk 2. The hydraulic loading mechanism 12 is provided. The hydraulic loading mechanism 12 includes a cylinder 24. The cylinder 24 includes a cylindrical portion 26 coaxially disposed on the outer periphery of the input shaft 1, a disk portion 28 integrally formed on the outer periphery of the cylindrical portion 26, and an axial direction of the input shaft 1 extending from the outer periphery of the disk portion 28. The cylinder 24 is spline-engaged with the outer periphery of the input shaft 1 and the inner periphery of the input side disk 2 so that the cylinder 24 is connected to the input shaft. 1 is slidable along one axis. The annular edge 29 of the cylinder 24 is fitted to the outer peripheral portion from the back side of the input side disk 2, and a space surrounded by the back side of the input side disk 2 and the cylinder 24 is a hydraulic chamber. . When oil is supplied to the hydraulic chamber, the input side disk 2 is pressed toward the output side disk 3.

JP 2001-32900 A JP 2003-35351 A

By the way, in the single cavity toroidal continuously variable transmission described in Patent Document 1, since the loading cam mechanism 6 includes the cam disk 4 and the cam roller 5, the axial thickness of the cam disk 4, The dimension of the variator in the axial direction is increased by the diameter of the cam roller 5, and the weight is increased by the cam disk 4 and the cam roller 5.
Further, in the single cavity toroidal continuously variable transmission described in Patent Document 2, the hydraulic loading mechanism 12 includes a cylindrical portion 26 disposed coaxially on the outer periphery of the input shaft 1 on the back side of the input side disk 2; Since the cylinder 24 having the disk portion 28 integrally formed on the outer periphery of the cylindrical portion 26 and the annular edge portion 29 extending from the outer periphery of the disk portion 28 in the axial direction of the input shaft 1 is provided, the shaft of the cylinder 24 is provided. The axial dimension of the variator is increased by the length of the direction, and the weight is increased by the cylinder.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a single-cavity toroidal continuously variable transmission that can reduce the axial dimension and weight of a variator.

In order to achieve the above object, a single cavity toroidal continuously variable transmission according to the present invention includes a first disc and a second disc that are concentrically and rotatably provided with their respective inner surfaces facing each other. A disk, a power roller sandwiched between the two disks, a pressing mechanism for pressing the second disk in the axial direction toward the first disk fixed in the axial direction, and a back side of the second disk A single-cavity toroidal continuously variable transmission that is provided coaxially with the second disk and that receives a thrust load,
The pressing mechanism includes a hydraulic chamber provided in an oil-tight manner between the back surface of the second disk and the raceway.

  In the present invention, since the pressing mechanism includes a hydraulic chamber provided in an oil-tight manner between the back surface of the second disk and the raceway, the cam disk constituting the conventional loading cam mechanism Unlike conventional cam rollers and cylinders that make up a conventional hydraulic loading mechanism, the axial length of the pressing mechanism can be reduced, and the conventional cam disk, cam roller, cylinder, etc. are no longer required. The weight can be reduced compared to

  According to the present invention, since the pressing mechanism includes the hydraulic chamber provided in an oil-tight manner between the back surface of the second disk and the raceway, the shaft of the variator is compared with the conventional one. Directional dimensions and weight can be reduced.

1 is a side sectional view showing a single cavity toroidal continuously variable transmission according to an embodiment of the present invention. FIG. 6 is a cross-sectional view of the main part showing a case where a hydraulic chamber is provided between the back surface of the output side disk and the raceway. It is a plane sectional view showing an example of the conventional single cavity type toroidal type continuously variable transmission. It is a plane sectional view showing other examples of the conventional single cavity type toroidal type continuously variable transmission.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating a single cavity toroidal continuously variable transmission according to an embodiment of the present invention.
As shown in FIG. 1, a single cavity toroidal continuously variable transmission according to the present embodiment includes an input shaft 1 as a torque input shaft that is rotationally driven by a drive source including an engine (not shown), and the like. An input side disk (first disk) 2 that is mounted in a fixed state in the axial direction and rotates with the input shaft 1, and an output side that is mounted on the input shaft 1 so as to be rotatable and movable in the axial direction. A toroidal transmission mechanism (variator) 10 including a disk (second disk) 3 and a rotatable power roller 7 sandwiched between arc-shaped concave surfaces of the input side disk 2 and the output side disk 3 facing each other; And a pressing mechanism 20 that presses the output side disk 3 toward the input side disk 2.

  A large-diameter portion 1 a is provided at the right end portion of the input shaft 1, and a restricting member 9 is brought into contact with the left end surface of the large-diameter portion 1 a, and the restricting member 9 is provided on the back surface of the input side disk 2. And is brought into contact with the bottom surface of the recess. This restricts the input side disk 2 from moving in the direction away from the output side disk 3 (right direction).

Further, the single cavity toroidal continuously variable transmission according to the present embodiment includes a planetary gear mechanism 30 on the left side of the variator 10.
The planetary gear mechanism 30 includes a sun gear 31, a planetary gear 32, a carrier 33, and a ring gear 34. The sun gear 31 is provided coaxially with the input shaft 1 and rotatable relative to the input shaft 1, and an output shaft (not shown) is connected to the sun gear 31 coaxially with the input shaft 1.
A plurality of planetary gears 32 are provided around the sun gear 31 at predetermined intervals in the circumferential direction and meshed with the sun gear 31.

The carrier 33 is a disc-like one provided coaxially with the sun gear 31 on the right side of the planetary gear 32, and the shaft 32 a of the planetary gear 32 is fixed to the carrier 33. The plurality of planetary gears 32 are arranged at predetermined intervals in the circumferential direction by the carrier 33, and the carrier 33 rotates (revolves) around the axis of the sun gear 31 synchronously.
The carrier 33 is engaged with a raceway 35 that is rotatably provided on the input shaft 1, and the carrier 33 is rotatably supported by the raceway 35.
A ring-shaped receiving member 36 is provided coaxially with the input shaft 1 on the left side of the race ring 35, and the receiving member 36 is restricted from moving leftward by a restricting member 37 fixed to the input shaft 1. Has been. The regulating member 37 is fixed by a fixing ring 39 after being fitted into a groove formed in the input shaft 1. The fixing ring 39 is provided with a spring retainer 40. A disc spring 41 is provided between the spring retainer 40 and the receiving member 36, and the receiving member 36 is urged rightward by the disc spring 41. .

  Further, raceway grooves are provided on the opposing surfaces of the receiving member 36 and the raceway ring 35, and a plurality of balls 42 as rolling elements are provided in the circumference direction at predetermined intervals in the raceway groove. The plurality of balls 42 are held at predetermined intervals in the circumferential direction by a holder 42a. Therefore, the thrust bearing 43 is comprised by the receiving member 36, the race ring 35, the ball | bowl 42, and the holder | retainer 42a.

The ring gear 34 is formed in a substantially cylindrical shape, and a gear provided on the inner peripheral surface on the left end side meshes with the planetary gear 32. Further, an engaged portion 34b is provided on the inner peripheral surface of the ring gear 34 on the right end portion side, and the engaged portion 3b provided on the outer peripheral surface of the output side disk 3 is engaged with the engaged portion 34b. ing. Therefore, the ring gear 34 rotates with the output side disk 3.
In the planetary gear mechanism 30 having such a configuration, when the ring gear 34 is rotated by the output side disk 3, the planetary gear 32 rotates together with the carrier 33 around the axis of the sun gear 31, thereby rotating the sun gear 31. Thus, an output shaft (not shown) rotates.

The pressing mechanism 20 is configured as follows.
That is, first, on the back side of the output side disk 3, a thrust bearing (bearing) 45 is provided adjacent to and coaxially with the thrust bearing 43. The thrust bearing 45 receives a thrust load, and a bearing ring 35 that rotatably supports the carrier 33, and a bearing ring 46 that is opposed to the bearing ring 35 and is coaxial with the bearing ring 35. A plurality of balls 47 serving as rolling elements and a retainer 47a that holds the plurality of balls 47 in the circumferential direction at predetermined intervals. That is, the thrust bearing 45 and the thrust bearing 43 share the race ring 35.

A hydraulic chamber 51 is provided between the raceway ring 46 of the thrust bearing 45 and the back surface of the output side disk 3.
That is, first, on the back surface of the output side disk 3, a circular recess 50 is provided coaxially with the output side disk 3 and recessed in the axial direction.
On the other hand, the raceway ring 46 of the thrust bearing 45 is inserted into the entrance of the recess 50. The race ring 46 is formed in a donut plate shape, and its diameter is substantially equal to or slightly smaller than the inner diameter of the recess 50, and the inner diameter of the central hole is substantially equal to or slightly larger than the diameter of the input shaft 1, The input shaft 1 is inserted through the hole.

A ring-shaped seal member 46a is fitted in a concave groove provided on the outer diameter surface of the bearing ring 46 so as to extend in the circumferential direction. The seal member 46a is oil-tight on the inner peripheral surface of the recess 50. Relative sliding contact. Further, a ring-shaped seal member 46b is fitted in a concave groove extending in the circumferential direction on the inner diameter surface of the race ring 46, and the seal member 46b is oil-tight relative to the outer peripheral surface of the input shaft 1. In sliding contact.
Further, a ring-shaped seal member 46 c is fitted in a concave groove extending in the circumferential direction on the inner diameter surface of the output side disk 3, and the seal member 46 c is oil-tight on the outer peripheral surface of the input shaft 1. It is in sliding contact.
As a result, a hydraulic chamber 51 is oil-tightly provided in the recess 50 between the race ring 46 and the bottom surface of the recess 50.

The input shaft 1 is provided with an oil passage 52 extending in the axial direction, and an end portion of the oil passage 52 is open to the outer peripheral surface of the input shaft 1 facing the hydraulic chamber 51. Therefore, oil is supplied to the hydraulic chamber 51 through the oil passage 52, and the output side disk 3 is pressed and moved toward the input side disk 2 by this hydraulic pressure.
That is, the race ring 46 is generated in the hydraulic chamber 51 because the movement in the direction away from the output side disk 3 (left side) is restricted by the receiving member 36 via the ball 47, the race ring 35, and the ball 42. The output side disk 3 is pressed and moved toward the input side disk 2 by hydraulic pressure.

Thus, in this embodiment, the pressing mechanism 20 is provided with the recess 50 provided on the back surface of the output side disk 3, the race ring 46 provided in the recess 50, and the race ring 46 and the recess 50. Unlike the cam disk and cam roller constituting the conventional loading cam mechanism, the cylinder constituting the conventional hydraulic loading mechanism, and the like. The pressing mechanism 20 can be stored in the recess 50.
Therefore, the dimension of the variator 10 in the axial direction can be reduced as compared with the conventional case, and the weight of the variator 10 can be reduced as compared with the conventional case because the cam disk, the cam roller, the cylinder, and the like which are conventionally required are not required.

In the present embodiment, the hydraulic chamber 51 is provided between the bottom surface of the recess 50 provided on the back surface of the output side disk 3 and the raceway ring 46. For example, as shown in FIG. The outer diameter portion of the output side disk 3 is covered by the outer diameter portion of the output side 46, and the sealing member 53 is provided between them, so that the hydraulic chamber 51 is placed between the rear surface of the output side disk 3 and the raceway ring 46. You may provide densely.
In the present embodiment, the other bearing ring 46 of the thrust bearing 45 having the bearing ring 35 that rotatably supports the carrier 33 of the planetary gear mechanism 30 as one of the bearing rings is provided in the recess 50. However, the bearing ring provided in the recess 50 is not limited to the bearing ring 46 constituting the thrust bearing 45. For example, the other bearing ring of the bearing configured to directly receive the thrust load from the output-side disk 3 may be provided in the recess 50.
In this embodiment, the case where the output side disk 3 is pressed by the pressing mechanism 20 has been described as an example. However, in the toroidal continuously variable transmission, the input / output relationship between the input side disk and the output side disk is reversed. In some cases. Therefore, the present invention can also be applied to the case where the input side disk is pressed by the pressing mechanism 200.

  Furthermore, in the present embodiment, the case where the present invention is applied to a single-cavity half-toroidal continuously variable transmission has been described as an example. However, the present invention is also applied to a single-cavity full-toroidal continuously variable transmission. it can.

1 Input shaft (axis)
2 Input disk (first disk)
3 Output disk (second disk)
4 Power roller 20 Pressing mechanism 45 Thrust bearing (bearing)
46 Raceway 50 Recess 51 Hydraulic room

Claims (1)

A first disk and a second disk that are concentrically and rotatably provided with the inner surfaces facing each other, a power roller sandwiched between these disks, and an axially fixed And a pressing mechanism that axially presses the second disk toward the first disk, and a bearing that is provided coaxially with the second disk on the back side of the second disk and receives a thrust load. In single cavity type toroidal type continuously variable transmission,
The single-cavity toroidal continuously variable transmission characterized in that the pressing mechanism includes a hydraulic chamber provided in an oil-tight manner between a back surface of the second disk and a bearing ring constituting the bearing. .

Images