JP2016020715A - Toroidal continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toroidal continuously variable transmission for realizing a structure capable of expanding a traction surface area, expanding a ratio range, and improving post rigidity.SOLUTION: Out of a pair of thrust races 31a and 31b constituting a thrust ball bearing 30, the thrust race 31a is fixedly press-fitted into a stepped portion 21 of an output-side disc 20. Furthermore, the thrust race 31b is abutted on a post 40 and a flange portion 31c of the thrust race 31b is fitted into an inner circumferential surface of the post 40. A desired preload is applied to the thrust ball bearing 30 by a plate spring 60 inserted between the post 40 and the thrust race 31b.SELECTED DRAWING: Figure 1

Description

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

  An example of a double-cavity toroidal-type continuously variable transmission used as a transmission for an automobile is shown in FIG. In FIG. 2, the positions of the cross sections are shifted by 90 degrees in the rotational direction between the pair of cavities. As shown in the figure, the toroidal continuously variable transmission 1 includes a pair of input side disks 2a and 2b which are outer disks, an integrated output side disk 3 which is also an inner disk, and a plurality of power rollers 4 and 4. With. The pair of input-side disks 2a and 2b are coupled to each other concentrically and synchronously via an input shaft 5 that is a rotating shaft. The output side disk 3 is supported between the input side disks 2a and 2b so as to be concentric with the input side disks 2a and 2b and to be rotatable relative to the input side disks 2a and 2b. ing. Further, a plurality of each of the power rollers 4 and 4 is sandwiched between both side surfaces in the axial direction of the output side disk 3 and one side surface in the axial direction of both input side disks 2a and 2b. The power rollers 4 and 4 transmit power from the input disks 2a and 2b to the output disk 3 while rotating with the rotation of the input disks 2a and 2b.

  Both ends (hereinafter also referred to as small end surfaces) of the output side disk 3 in the axial direction are rotatably supported by a pair of ball bearings 6.6 each of which is a thrust angular type. For this reason, the support posts 8a and 8b fixed to the inner surface of the casing 7 are connected by an annular holding ring 9 which is a member fixed to the inner surface of the casing. These support posts 8a and 8b are for supporting the support plates 11a and 11b that support both ends of the trunnions 10 and 10 that are support members that rotatably support the power rollers 4 and 4, respectively. They are provided concentrically with each other on the opposite side in the radial direction across the shaft 5. In this structure, a pair of support posts 8 a and 8 b are connected by a holding ring 9, and the input shaft 5 is inserted inside the holding ring 9.

  Each holding ring 9, 9 provided for each cavity and both end surfaces in the axial direction of the output side disk 3, that is, inner diameter side portions than the output side surfaces 12, 12 provided on both side surfaces of the output side disk 3. In between, each ball bearing 6,6 is provided. Further, short cylindrical protrusions 14 and 14 are provided over the entire circumference on the inner diameter portions of the outer surfaces (side surfaces opposite to each other) of the pair of thrust bearing rings 13a and 13b constituting the ball bearings 6 and 6, respectively. Is formed. Then, the ball bearings 6, 6 are positioned in the radial direction by fitting the protrusions 14, 14 into the holding rings 9, 9 and the short portions of the output side disk 3. In addition, the ball bearings 6 and 6 are positioned in the axial direction by sandwiching shim plates 15 and 15 between the outer side surfaces of the thrust raceways 13a and 13a and the holding rings 9 and 9, respectively. . Further, in this state, a desired preload is applied to each of the ball bearings 6 and 6. The output side disk 3 is rotatably supported in a state where positioning in the radial direction and the axial direction is achieved between the instruction posts 8a and 8b provided in pairs in each cavity.

  As described above, there are various conventional structures based on the integrated output disk. The structure described in Patent Document 1 improves the rigidity of both ends by abutting the bearing ring of the thrust ball bearing against the small end face of the output disk and restricting the axial direction and / or the diameter method of the output side disk. The traction surface usage range can be expanded. However, in the above structure, since the distance between the small end face of the output disk and the post end face becomes long, the area of the traction face cannot be widened.

Moreover, the structure described in patent document 2 has expanded the area | region of the traction surface by forming a thrust ball bearing raceway surface in a support post. However, since the above structure is difficult to process, the cost may increase.

JP 2009-174573 A JP 2013-224683 A

In view of the circumstances as described above, the present invention has been invented to realize a structure in which the area of the traction surface can be expanded, the resi orange can be enlarged, and the rigidity of the post can be increased.

In order to achieve the above object, the present invention provides a casing, an input shaft rotatably supported in the casing, and the input shaft at both ends of the input shaft in a state where one axial side of each other faces each other. A pair of input-side disks that are rotatably supported in synchronization with the shaft, and with respect to the input shaft in a state in which both side surfaces in the axial direction are opposed to one side surface in the axial direction of each input disk around the intermediate portion of the input shaft A plurality of output-side disks that are supported so as to be relatively rotatable, and a plurality of twists with respect to the input shaft in the axial direction at positions between both axial side surfaces of these output-side disks and one axial side surface of each input-side disk. The trunnions are provided so as to be able to swing around the pivot at the position of, and are supported by the respective trunnions so as to be rotatable. A thrust ball bearing having a pair of thrust bearing rings with respect to a post fixed to the inner surface of the caging, with a power roller abutting against one side surface of the disk in the axial direction. A toroidal continuously variable transmission that is rotatably supported by
A step portion is provided on the rotation center side of the axial end portion of the output side disk, and one thrust raceway ring of the thrust ball bearing is press-fitted and fixed to the step portion.

  According to the said structure, the area | region of the said traction surface becomes large and resi orange is expanded. In addition, by inserting the ball bearing race into the stepped portion at the small-diameter end of the inner disk, it becomes possible to increase the thickness of the bearing fitting portion of the post by the amount of intrusion. Can be high.

The principal part sectional view explaining embodiment of this invention. The figure explaining the conventional structure.

  Hereinafter, description will be made with reference to the drawings according to embodiments of the present invention.

  An embodiment according to the present invention will be described with reference to FIG. The feature of the present invention resides in the support structure for the integrated output side disk, and other configurations and operations are the same as those of the conventional structure and operation described above. Therefore, only the features of the present invention will be referred to below. To do.

FIG. 1 shows a cross-section of the main part of a toroidal type continuously variable transmission according to an embodiment of the present invention.
A step portion 21 is provided on the side surface of the output side disk 20 on the rotation center side.
Of the pair of thrust raceways 31 a and 31 b constituting the thrust ball bearing 30, the thrust race 31 a is press-fitted and fixed to the stepped portion 21 of the output side disk 20, and the thrust race 31 b contacts the post 40. The flange portion 31 c is fitted to the inner peripheral surface of the post 40. The thrust ball bearing 30 is given a desired preload by a disc spring 60 inserted between the post 40 and the thrust race 31b. On the other hand, by arranging a radial needle bearing 70 between the output side disk 20 and the input shaft 50, the output side disk 20 is rotatably supported while being positioned in the radial direction and the axial direction. ing.

According to the above configuration, since the thrust raceway ring 31a of the thrust ball bearing 30 is press-fitted and fixed to the step portion 21 on the side surface of the output side disk 20,
(1) Even if the traction surface 20a with the power roller of the output side disk 20 is extended in the axial direction,
Since the deformation of the output side disk 20 can be suppressed and the strength is improved, it is possible to increase the use range of the traction surface 20a. As a result, the transmission orange of the transmission can be enlarged.
(2) Since the thickness of the contact portion between the post 40 and the thrust race 31b can be increased by the axial dimension of the stepped portion 21, the post rigidity can be increased.

1 Toroidal continuously variable transmission
2a, 2b Input side disk
3 Output disk
4 Power roller
5 Input shaft
6 Ball bearing 7 Casing 8a, 8b Support post 9 Retaining ring 10 Trunnion 11a, 11b Support plate Output side surface 12
13a, 13b Thrust raceway ring 14 ridge 15 shim plate 20 output side disk 20a traction surface 21 step 30 thrust ball bearing 31a, 31b thrust raceway 31c flange 40 post 50 input shaft 60 disc spring 70 radial needle bearing

Claims (1)

A casing, an input shaft rotatably supported in the casing, and a pair of inputs that are rotatably supported synchronously with the input shaft at both ends of the input shaft in a state where one side in the axial direction faces each other A side disk, and an output side disk supported so as to be relatively rotatable with respect to the input shaft in a state where both side surfaces in the axial direction are opposed to one side surface in the axial direction of each input disk around the intermediate portion of the input shaft, With respect to the axial direction, a plurality of each of the output side discs in the axial direction on both sides in the axial direction and one axial side surface of each input side disc can be swung around a pivot that is twisted with respect to the input shaft. The provided trunnions and the respective circumferential surfaces, which are rotatably supported by the respective trunnions and have a spherical convex surface, are brought into contact with both axial side surfaces of the output side disk and one axial side surface of each input surface disk. The A toroidal-type continuously variable transmission including a roller and rotatably supporting an axial end portion of the output-side disk by a thrust ball bearing having a pair of thrust race rings with respect to a post fixed to the inner surface of the casing. ,
A toroidal continuously variable transmission characterized in that a step is provided on the rotation center side of the axial end portion of the output side disk, and one thrust raceway ring of the thrust ball bearing is press-fitted and fixed to the step.

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