JP2013167344A - Toroidal type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toroidal type continuously variable transmission preventing generation of sliding between a disk and a power roller without increasing a number of parts.SOLUTION: An output gear integrally formed by arranging the output gear for transmitting power in an outer peripheral part of an output side disk coaxially with the output side disk and forming output side inside faces being concave faces of an arc shape in a crosssection constituting the output side disk in both side faces of a single member in an axial direction is a helical gear, a torsion direction of a tooth of the helical gear is set such that gear reaction force generated in the output gear acts toward a side in which an input side disk in which a pushing device is not arranged is arranged by meshing of the output gear being the helical gear and another gear (not shown) when wheels are driven by an engine and a vehicle is running forward.

Description

  The present invention relates to a toroidal type continuously variable transmission, and more particularly to a toroidal type continuously variable transmission that can be used in transmissions of various industrial machines.

  For example, as described in Patent Documents 1 and 2, the use of a toroidal type continuously variable transmission as an automatic transmission for automobiles has been studied and implemented in part. FIG. 3 shows a so-called double cavity type of such a toroidal type continuously variable transmission. This toroidal-type continuously variable transmission has a pair of input sides, each of which is an outer disk described in the claims, at two positions in the axial direction of the input rotary shaft 1 which is the rotary shaft described in the claims. The disks 2a and 2b are supported. These input side disks 2a, 2b are each a toroidal curved surface (concave arc-shaped concave surface) with respect to the input rotation shaft 1, and are on the input side corresponding to one axial side surface recited in the claims. In a state where the side surfaces 3 and 3 are opposed to each other, concentric and synchronized rotation is supported freely.

  Further, the intermediate portion of the input rotary shaft 1 is inserted through a through hole 6 provided in a partition wall portion 5 installed in a casing 4 housing a toroidal type continuously variable transmission. A cylindrical output cylinder 7 is rotatably supported by a pair of rolling bearings 8, 8 on the inner diameter side of the through hole 6, and an output gear 9 is fixed to the outer peripheral surface of the intermediate portion of the output cylinder 7. Has been established. Further, a pair of output side disks 10a and 10b corresponding to the inner disks described in the claims are respectively connected to the protruding portions of both ends of the output cylinder 7 from the outer side surfaces of the partition wall 5 by splines. By the engagement, the rotation synchronized with the output cylinder 7 is freely supported. In this state, the output side inner surfaces 11, 11 of the output side disks 10a, 10b, each of which is a toroidal curved surface (concave arc-shaped concave surface) and corresponding to both side surfaces in the axial direction recited in the claims. Is opposed to the input side inner surfaces 3 and 3.

  In addition, a plurality (generally two or three) of power rollers 12 are provided in a portion (cavity) between the input side and output side inner side surfaces 3 and 11 around the input rotation shaft 1. , 12 are arranged. Each of these power rollers 12 and 12 has a spherical convex surface on the peripheral surfaces 13 and 13 that come into contact (rolling contact) with the inner surfaces 3 and 11 on both the input and output sides, and is described in the claims. The trunnions 14 and 14 corresponding to the supporting members are supported on the inner surfaces of the trunnions 14 and 14 so as to be freely rotatable and slightly oscillating. Each of the trunnions 14 and 14 is provided with a swinging displacement about a pivot that is twisted with respect to the input rotary shaft 1.

  When changing the gear ratio between the input side disks 2a and 2b and the output side disks 10a and 10b, the trunnions 14 and 14 are displaced in the axial direction of the pivot (front and back direction in FIG. 3). As a result, rolling contact portions between the peripheral surfaces 13 and 13 of the power rollers 12 and 12 and the input and output inner surfaces 3 and 11 of the input and output disks 2a, 2b, 10a and 10b ( The direction of the tangential force acting on the traction section changes (side slip occurs in the rolling contact section). As the direction of the force changes, the trunnions 14 and 14 swing (tilt) about the pivot, and the peripheral surfaces 13 and 13 of the power rollers 12 and 12 and the input side and output The contact positions of the side disks 2a, 2b, 10a and 10b with the input side and output side inner surfaces 3 and 5 change.

  For example, as shown in FIG. 3, the peripheral surfaces 13, 13 of each of the power rollers 12, 12 are connected to the radially inward portions of the input side inner surfaces 3, 3 of the input side disks 2a, 2b and the output side disk. If it is brought into rolling contact with the radially outer portions of the output side inner surfaces 11, 11 of 10a, 10b, the gear ratio between the two disks 2a, 2b, 10a, 10b becomes the deceleration side. On the other hand, conversely to FIG. 3, the peripheral surfaces 13 and 13 of the power rollers 12 and 12, and the radially outward portions of the input side inner surfaces 3 and 3 of the input side disks 2 a and 2 b, If the rolling contact is made with the radially inner portions of the output side inner surfaces 11, 11 of the output side disks 10a, 10b, the gear ratio between the two disks 2a, 2b, 10a, 10b will be increased. Become.

  During operation of the toroidal-type continuously variable transmission as described above, one input side disk 2a is connected via a loading cam type pressing device 16 by a drive shaft 15 connected to a power source such as an engine. Rotating drive. As a result, the pair of input-side disks 2a and 2b supported at both ends of the input rotation shaft 1 rotate synchronously while being pressed in a direction approaching each other. Then, this rotation is transmitted to both the output side disks 10a and 10b via the power rollers 12 and 12, and is taken out from the output gear 9.

  In the case of the structure shown in FIG. 3 as described above, similarly to the structure described in Patent Document 1, the output gear 9 and another gear 17 that meshes with the output gear 9 by a pair of rolling bearings 8, 8. The output side disks 10a and 10b are positioned in the axial direction (supporting axial displacement) while supporting the load applied to the meshing portion. That is, a thrust load (axial load) Fa and a radial load Fr are applied to the meshing portions of the gears 9 and 17 based on the meshing of the helical gears constituting the gears 9 and 17. Further, based on the thrust load Fa, the output gear 9 is caused to have a moment M (in the direction of shifting the center axis of the output gear 9 and the center axis of the input rotary shaft 1) in the direction in which the output gear 9 is inclined (turned down). M = P · Fa) is applied when the moment load M and the pitch circle diameter of the output gear 9 are 2P. The rolling bearings 8 and 8 position the output disks 10a and 10b while supporting the loads Fa and Fr and the moment M, respectively.

  On the other hand, in Patent Document 2, as shown in FIG. 4, the output side disk 10 is constituted by a single member having a shape such that a pair of output side disks 10a and 10b (FIG. 3) are coupled and fixed. In addition, a structure in which an output gear 9a is provided on the outer peripheral surface of the intermediate portion of the output side disk 10 is described. In the case of such a structure, compared to the structure shown in FIG. 3, the output gear 9, the partition wall 5, and the rolling bearings 8 and 8 (FIG. 3) are not provided. The axial dimension of the entire machine can be reduced.

  However, as shown in FIGS. 3 and 4, in the double cavity type toroidal continuously variable transmission, the pressing force generated by the pressing device 16 is applied to the input side disk 2b not provided with the pressing device 16. It is transmitted via the ball spline 18 and the input rotary shaft 1. For this reason, compared to the pressing force applied to the input side disk 2a provided with the pressing device 16 due to the sliding resistance of the ball spline 18 and the input rotary shaft 1, the input side disk 2b provided with no pressing device 16 is applied. The applied pressing force may be reduced.

Japanese Patent Laid-Open No. 1-229158 JP 11-63139 A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a toroidal continuously variable transmission that prevents the occurrence of slip between a disk and a power roller without increasing the number of parts. To do.

  To achieve the above object, a toroidal-type continuously variable transmission according to claim 1 is provided with a casing, a rotary shaft rotatably supported in the casing, and shafts each having an arcuate cross section. A pair of outer disks supported at both ends of the rotating shaft in a state where one side surfaces thereof are opposed to each other so as to be able to freely rotate in synchronization with the rotating shaft, and a cross-sectional arc around the intermediate portion of the rotating shaft An inner disk that is freely supported for relative rotation with respect to the rotating shaft in a state where both side surfaces in the axial direction are opposed to one axial side surface of each of the outer disks, and both axial directions of the inner disks with respect to the axial direction. A plurality of support members each provided at a position between the surface and one axial side surface of each outer disk, and freely swingable about a pivot that is twisted with respect to the rotating shaft, Turn to support member A power roller that is freely supported and has a spherical convex surface that is in contact with both axial side surfaces of the inner disk and one axial side surface of each outer disk, and the pair of outer disks A pressing device that axially presses one outer disk of the inner disk toward the inner disk opposed to the one outer disk, and a member having a small-diameter end of the inner disk fixed to the inner surface of the casing. The inner disk is constituted by a single member, and is supported by a rolling bearing so as to be rotatable. Further, a power transmission gear is concentrically provided on the outer peripheral edge of the inner disk. A toroidal-type continuously variable transmission provided, wherein the gear is a helical gear, and the torsional direction of the gear teeth is determined by the gear reaction force generated in the gear during forward traveling of the vehicle. Characterized in that it is a direction which acts toward the side of arranging the other outer disk that is not provided with the pressing device.

  Further, in the toroidal type continuously variable transmission according to claim 2, the gear reaction force is a gear generated in the gear in a mode in which the usage time is long when there are a plurality of modes during forward travel of the vehicle. It is a reaction force.

  The toroidal continuously variable transmission according to claim 3 is characterized in that the gear reaction force is a torque input to the toroidal continuously variable transmission when there are a plurality of modes during forward travel of the vehicle. It is a gear reaction force generated in the gear in the large mode.

  Further, in the toroidal continuously variable transmission according to claim 4, in the mode in which the gear reaction force has a large axial force generated by the pressing device when there are a plurality of modes during forward travel of the vehicle. It is a gear reaction force generated in the gear.

  According to the toroidal type continuously variable transmission of the present invention, the gear reaction force generated by the meshing of the gears is applied to the outer disk on which the pressing device is not provided when the vehicle is traveling forward. As a result, the amount of the pressing force transmitted to the outer disk on the side where the pressing device is not provided, which is reduced by the sliding resistance of the ball spline, the input rotating shaft, etc., can be assisted by the gear reaction force. For this reason, it is possible to prevent slippage between the disk and the power roller without increasing the number of parts.

The figure explaining an example of embodiment of this invention. The figure explaining an example of embodiment of this invention. The figure explaining the 1st example of conventional structure. The figure explaining the 2nd example.

  1 and 2 show an example of an embodiment of the present invention. The feature of this example is that the disk and the power roller can be obtained without increasing the number of parts by devising the shape of the gear provided on the outer peripheral edge of the output side disk which is the inner disk described in the claims. This is to prevent the occurrence of slippage between the two. Since the structure and operation of the other parts are substantially the same as those of the conventional structure shown in FIGS. 3 to 4 described above, the overlapping description will be omitted or simplified, and the following description will focus on the characteristic parts of this example.

  In the case of this example, an output gear 20 for power transmission is provided concentrically with the output side disk 19 on the outer peripheral portion of the output side disk 19. The output-side disk 19 is integrally formed by forming output-side inner side surfaces 21 that are concave surfaces having an arcuate cross section constituting the output-side disk 19 on both side surfaces in the axial direction of a single member. In the case of this example, the output gear 20 is directly formed on the outer peripheral edge portion of the output side disk 19, and the output side disk 19 and the output gear 20 are integrally formed.

  In addition, a pair of support columns 22 and 22 are provided in each cavity respectively present on both sides in the axial direction of the output side disk 19 in a state of being supported by a fixed part such as a casing via an actuator body 23. . Then, both end portions in the axial direction of the output side disk 19 are rotatably supported via thrust ball bearings 25 on support rings 24, 24 provided at intermediate portions of the respective struts 22, 22.

  Further, the output gear 20 is a helical gear, and when the vehicle is driven forward by the wheels driven by the engine, the output gear 20 which is a helical gear meshes with another gear (not shown). The helical direction of the helical gear teeth is set so that the gear reaction force generated in the output gear 20 acts toward the side where the input side disk 27b without the pressing device 26 is disposed.

  In the case of the toroidal continuously variable transmission of the present invention configured as described above, the gear reaction force generated in the output gear 20 due to the meshing of the output gear 20 and the other gear is not provided with the pressing device 26. Since it acts toward the side where the input side disk 27b is disposed, this gear reaction force assists the pressing force from the pressing device 26 that is reduced by the sliding resistance while being transmitted through the rotary shaft 28. Therefore, it is possible to prevent the traction portion from slipping due to insufficient pressing force.

  In addition, the toroidal continuously variable transmission of the present invention configured as described above has a mode in which a long time is used or a toroidal continuously variable transmission when there are a plurality of modes when the vehicle is traveling forward. This is suitable for a mode in which a large torque is input to the mode and a mode in which the axial force generated by the pressing device is large.

DESCRIPTION OF SYMBOLS 1 Input rotating shaft 2a, 2b Input side disk 3 Input side inner surface 4 Casing 5 Partition part 6 Through hole 7 Output cylinder 8 Rolling bearing 9, 9a Output gear 10, 10a, 10b Output side disk 11 Output side inner surface 12 Power roller 13 peripheral surface 14 trunnion 15 drive shaft 16 pressing device 17, 17a another gear 18 ball spline 19 output side disk 20 output gear 21 output side inner surface 22 support 23 actuator body 24 support ring 25 thrust ball bearing 26 pressing devices 27a, 27b Input side disk 28 Rotating shaft

Claims (4)

A rotating shaft supported rotatably in the casing, and a rotating shaft supported on both ends of the rotating shaft in a state where the axial side surfaces of the rotating shaft are opposed to each other. A pair of outer disks supported so as to be able to freely rotate in a synchronized manner, and a state where both axial side surfaces having an arcuate cross section are opposed to one axial side surface of each outer disk around the intermediate portion of the rotating shaft And a plurality of inner disks that are supported to freely rotate relative to the rotating shaft, and a plurality of the inner disks in the axial direction between the axial side surfaces of the inner disks and the axial side surfaces of the outer disks. A support member that is freely provided with a swinging displacement centered on a pivot that is twisted with respect to the shaft, and a circumferential convex surface that is rotatably supported by each of the support members, and has a spherical convex surface. A power roller in contact with both side surfaces in the axial direction and one side surface in the axial direction of each outer disk, and one outer disk of the pair of outer disks are placed on the inner disk facing the one outer disk. A pressing device that presses in the axial direction, and supports the inner disk in a rotatable manner by a rolling bearing with respect to a member in which the end on the small diameter side of the inner disk is fixed to the inner surface of the casing. In the toroidal continuously variable transmission in which the power transmission gear is provided concentrically with the inner disk, and the inner disk is configured as an integral type.
The gear is a helical gear, and the torsion direction of the gear teeth is such that the gear reaction force generated in the gear when the vehicle is traveling forward is on the side where the other outer disk not provided with the pressing device is disposed. A toroidal-type continuously variable transmission characterized in that it is in a direction to act toward.   2. The toroidal according to claim 1, wherein the gear reaction force is a gear reaction force generated in the gear in a mode in which the vehicle is used for a long time when there are a plurality of modes during forward travel of the vehicle. Type continuously variable transmission.   The gear reaction force is a gear reaction force generated in the gear in a mode in which a large torque is input to the toroidal type continuously variable transmission when there are a plurality of modes when the vehicle travels forward. The toroidal-type continuously variable transmission according to claim 1.   The gear reaction force is a gear reaction force generated in the gear in a mode in which the axial force generated by the pressing device is large when there are a plurality of modes during forward travel of the vehicle. Item 2. The toroidal continuously variable transmission according to item 1.

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