JP5041335B2 - Toroidal type continuously variable transmission and method of attaching synchronous cable - Google Patents

Description

  The present invention relates to a toroidal-type continuously variable transmission that can be used for transmissions of automobiles and various industrial machines, and a synchronization cable attaching method for attaching a synchronization cable to a pulley in such a toroidal-type continuously variable transmission.

  For example, a double-cavity toroidal continuously variable transmission used as a transmission for an automobile is configured as shown in FIGS. As shown in FIG. 4, the input shaft 1 is rotatably supported inside the casing 50, and two input side disks 2, 2 and two output side disks 3 are disposed on the outer periphery of the input shaft 1. 3 is attached. An output gear 4 is rotatably supported on the outer periphery of the intermediate portion of the input shaft 1. Output side disks 3 and 3 are connected to cylindrical flange portions 4a and 4a provided at the center of the output gear 4 by spline coupling.

  The input shaft 1 is driven to rotate by a drive shaft 22 via a loading cam type pressing device 12 provided between an input side disk 2 and a cam plate (loading cam) 7 located on the left side in the drawing. It has become. The output gear 4 is supported in the casing 50 via a partition wall 13 formed by coupling two members, so that the output gear 4 can rotate around the axis O of the input shaft 1 while the axis O. Directional displacement is prevented.

  The output side disks 3 and 3 are supported by needle bearings 5 and 5 interposed between the input shaft 1 so as to be rotatable about the axis O of the input shaft 1. Further, the left input side disk 2 in the figure is supported on the input shaft 1 via a ball spline 6, and the right side input disk 2 in the figure is splined to the input shaft 1. Rotates with the input shaft 1. A power roller is provided between the inner side surfaces (concave surface; also referred to as a traction surface) 2a and 2a of the input side disks 2 and 2 and the inner side surfaces (concave surface; also referred to as a traction surface) 3a and 3a of the output disks 3 and 3. 11 (see FIG. 5) is rotatably held.

  A step 2b is provided on the inner peripheral surface 2c of the input disk 2 located on the right side in FIG. 4, and the step 1b provided on the outer peripheral surface 1a of the input shaft 1 is abutted against the step 2b. At the same time, the back surface (right surface in FIG. 4) of the input side disk 2 is abutted against a loading nut 9 screwed into a screw portion 1 e formed on the outer peripheral surface of the input shaft 1. Thereby, the displacement of the input side disk 2 in the direction of the axis O with respect to the input shaft 1 is substantially prevented. Further, a disc spring 8 is provided between the cam plate 7 and the flange 1d of the input shaft 1, and this disc spring 8 is a concave surface 2a, 2a, 3a of each disk 2, 2, 3, 3. , 3a and the contact surface between the peripheral surfaces 11a and 11a of the power rollers 11 and 11 are applied with a pressing force.

  As shown in FIG. 5, which is a cross-sectional view taken along the line AA in FIG. The pair of yokes 23A and 23B is supported in the state. The pair of yokes 23A and 23B are formed in a rectangular shape by pressing or forging a metal such as steel. In order to support pivots 14 provided at both ends of the trunnion 15 to be described later in a swingable manner, circular support holes 18 are provided at the four corners of the yokes 23A and 23B, and the width direction of the yokes 23A and 23B. A circular locking hole 19 is provided at the center of the.

  The pair of yokes 23 </ b> A and 23 </ b> B are supported so as to be slightly displaceable by support posts 64 and 68 formed on portions of the inner surface of the casing 50 facing each other. These support posts 64 and 68 are provided so as to face the first cavity 221 and the second cavity 222, respectively, between the inner side surface 2a of the input side disk 2 and the inner side surface 3a of the output side disk 3. Yes.

  Therefore, the yokes 23 </ b> A and 23 </ b> B are supported by the support posts 64 and 68, and one end thereof faces the outer peripheral portion of the first cavity 221, and the other end faces the outer peripheral portion of the second cavity 222. doing.

  Since the first and second cavities 221 and 222 have the same structure, only the first cavity 221 will be described below.

  As shown in FIG. 5, inside the casing 50, the first cavity 221 is provided with a pair of trunnions 15, 15 that swing about a pair of pivots 14, 14 that are twisted with respect to the input shaft 1. It has been. In addition, illustration of the input shaft 1 is abbreviate | omitted in FIG. Each trunnion 15, 15 is a pair of bent portions formed at both ends in the longitudinal direction (vertical direction in FIG. 5) of the support plate portion 16 that is the main body portion in a state of being bent toward the inner side surface of the support plate portion 16. Wall portions 20 and 20 are provided. The bent wall portions 20 and 20 form concave pocket portions P for accommodating the power rollers 11 in the trunnions 15 and 15. Further, the pivot shafts 14 and 14 are concentrically provided on the outer side surfaces of the bent wall portions 20 and 20, respectively.

  A circular hole 21 is formed in the center portion of the support plate portion 16, and a base end portion (first shaft portion) 23 a of the displacement shaft 23 is supported in the circular hole 21. Then, by swinging each trunnion 15, 15 about each pivot 14, 14, the inclination angle of the displacement shaft 23 supported at the center of each trunnion 15, 15 can be adjusted. In addition, each power roller 11 is rotatably supported around the tip end portion (second shaft portion) 23b of the displacement shaft 23 protruding from the inner surface of each trunnion 15, 15. 11 is sandwiched between the input disks 2 and 2 and the output disks 3 and 3. In addition, the base end part 23a and the front-end | tip part 23b of each displacement shaft 23 and 23 are mutually eccentric.

  As described above, the pivot shafts 14 and 14 of the trunnions 15 and 15 are supported so as to be swingable with respect to the pair of yokes 23A and 23B and displaceable in the axial direction (vertical direction in FIG. 5). The trunnions 15 and 15 are restricted from moving in the horizontal direction by the yokes 23A and 23B. As described above, four circular support holes 18 are provided at the four corners of each of the yokes 23 </ b> A and 23 </ b> B. The pivot shafts 14 provided at both ends of the trunnion 15 are respectively provided in the support holes 18 with the radial needle bearings 30. It is supported so as to be able to swing through. Further, as described above, the circular locking hole 19 is provided in the central portion of the yokes 23A and 23B in the width direction (left and right direction in FIG. 5), and the inner peripheral surface of the locking hole 19 is cylindrical. Support posts 64 and 68 are internally fitted as surfaces. That is, the upper yoke 23A is swingably supported by the spherical post 64 supported by the casing 50 via the fixing member 52, and the lower yoke 23B is supported by the spherical post 68 and the drive for supporting the same. The upper cylinder body 61 of the cylinder 31 is swingably supported.

  The displacement shafts 23 and 23 provided in the trunnions 15 and 15 are provided at positions 180 degrees opposite to the input shaft 1. Further, the direction in which the distal end portion 23b of each of the displacement shafts 23, 23 is eccentric with respect to the base end portion 23a is the same direction as the rotational direction of both the disks 2, 2, 3, 3 (in FIG. (Reverse direction). Further, the eccentric direction is a direction substantially orthogonal to the direction in which the input shaft 1 is disposed. Accordingly, the power rollers 11 and 11 are supported so that they can be slightly displaced in the longitudinal direction of the input shaft 1. As a result, even if each power roller 11, 11 tends to be displaced in the axial direction of the input shaft 1 due to elastic deformation of each component member based on the thrust load generated by the pressing device 12, each component This displacement is absorbed without applying an excessive force to the member.

  Further, between the outer surface of the power roller 11 and the inner surface of the support plate portion 16 of the trunnion 15, a thrust ball bearing 24 that is a thrust rolling bearing, and a thrust needle bearing, in order from the outer surface side of the power roller 11. 25. Among these, the thrust ball bearing 24 supports the rotation of each power roller 11 while supporting the load in the thrust direction applied to each power roller 11. Each of the thrust ball bearings 24 is composed of a plurality of balls 26, 26, an annular retainer 27 for holding the balls 26, 26 in a freely rolling manner, and an annular outer ring 28. ing. Further, the inner ring raceway of each thrust ball bearing 24 is formed on the outer side surface (large end surface) of each power roller 11, and the outer ring raceway is formed on the inner side surface of each outer ring 28.

  The thrust needle bearing 25 is sandwiched between the inner surface of the support plate portion 16 of the trunnion 15 and the outer surface of the outer ring 28. Such a thrust needle bearing 25 supports the thrust load applied to each outer ring 28 from the power roller 11, while the power roller 11 and the outer ring 28 swing around the base end portion 23 a of each displacement shaft 23. Allow.

  Further, drive rods (shaft portions extending from the pivot shaft) 29 and 29 are provided at one end portions (lower end portions in FIG. 5) of the trunnions 15 and 15, respectively, and outer peripheral surfaces of intermediate portions of the drive rods 29 and 29 are provided. The drive pistons (hydraulic pistons) 33, 33 are fixedly provided. Each of these drive pistons 33 and 33 is oil-tightly fitted in a drive cylinder 31 constituted by an upper cylinder body 61 and a lower cylinder body 62. The drive pistons 33 and 33 and the drive cylinder 31 constitute a drive device 32 that displaces the trunnions 15 and 15 in the axial direction of the pivots 14 and 14 of the trunnions 15 and 15.

  In the case of the toroidal continuously variable transmission configured as described above, the rotation of the drive shaft 22 is transmitted to the input side disks 2 and 2 and the input shaft 1 via the pressing device 12. Then, the rotation of the input side disks 2 and 2 is transmitted to the output side disks 3 and 3 via the pair of power rollers 11 and 11, and the rotation of the output side disks 3 and 3 is further transmitted to the output gear 4. It is taken out more.

  When changing the rotational speed ratio between the input shaft 1 and the output gear 4, the pair of drive pistons 33, 33 are displaced in opposite directions. As the drive pistons 33 and 33 are displaced, the pair of trunnions 15 and 15 are displaced in directions opposite to each other. For example, the power roller 11 on the left side in FIG. 5 is displaced to the lower side in the figure, and the power roller 11 on the right side in the figure is displaced to the upper side in the figure. As a result, the peripheral surfaces 11a and 11a of the power rollers 11 and 11 act on contact portions of the input side disks 2 and 2 and the inner side surfaces 2a, 2a, 3a and 3a of the output side disks 3 and 3, respectively. The direction of the tangential force changes. As the force changes, the trunnions 15 and 15 swing in opposite directions around the pivots 14 and 14 pivotally supported by the yokes 23A and 23B.

  As a result, the contact position between the peripheral surfaces 11a and 11a of the power rollers 11 and 11 and the inner surfaces 2a and 3a changes, and the rotational speed ratio between the input shaft 1 and the output gear 4 changes. Further, when the torque transmitted between the input shaft 1 and the output gear 4 fluctuates and the amount of elastic deformation of each component changes, the power rollers 11 and 11 and the outer rings attached to the power rollers 11 and 11 will be described. 28 and 28 slightly rotate around the base end portions 23a and 23a of the displacement shafts 23 and 23, respectively. Since the thrust needle bearings 25 and 25 exist between the outer side surfaces of the outer rings 28 and 28 and the inner side surfaces of the support plate portions 16 constituting the trunnions 15 and 15, respectively, the rotation is performed smoothly. Is called. Therefore, as described above, the force for changing the inclination angle of each displacement shaft 23, 23 can be small.

  As can be seen from the above, the shift in the toroidal type continuously variable transmission is performed using the side slip force generated by moving the trunnion 15 supporting the power roller 11 up and down. The trunnion 15 is moved up and down by applying a pressure difference to the drive piston 33. In this case, since the drive piston 33 is provided in each trunnion 15, if for some reason the hydraulic pressure cannot be supplied to one drive piston 33, the trunnion 15 provided with the piston 33 is displaced. Accordingly, the tilt control of the power roller 11 supported by the trunnion 15 cannot be performed, and the swing of each trunnion 15 is not synchronized. If power is transmitted in this state, the traction surface of the power roller 11 may be damaged.

  In order to avoid this, for example, a synchronization structure as shown in FIGS. 6 and 7 is known. 6 and 7, the same components as those in FIGS. 4 and 5 described above are denoted by the same reference numerals, and the description thereof is simplified.

  As shown in FIGS. 6 and 7, grooves (hereinafter referred to as cable grooves) 260 integrally with each trunnion 15 of the first cavity 221 and adjacent to the radial needle bearing 30 above the radial needle bearing 30. 261 is formed, and a wire-like synchronous cable 262 is wound around the cable grooves 260 and 261 in a hooked manner. Similarly, the trunnions 15 of the second cavity 222 are also formed integrally and adjacent to the upper portion of the radial needle bearing 30 to form cable grooves 260a and 261a, and the synchronous cables 263 are hooked in these cable grooves 260a and 261a. It is wrapped around

  Further, a pulley 264 is provided on the drive rod 29 coupled to the pivot 14 of the trunnion 15 on the right side of the first cavity 221 in FIG. 6 so as to rotate integrally with the drive rod 29, and a second cavity 222 adjacent thereto is provided. A pulley 265 is provided on a drive rod 29 coupled to the pivot 14 of the trunnion 15 so as to rotate integrally with the drive rod 29, and a synchronous cable 266 is wound around the pulleys 264 and 265 in a hooked manner. Similarly, a pulley 264a is provided on the drive rod 29 coupled to the pivot 14 of the trunnion 15 on the left side of the first cavity 221 in FIG. 6 so as to rotate integrally with the drive rod 29, and a second cavity adjacent to the pulley 264a is provided. A pulley 265a is provided on a drive rod 29 coupled to the pivot 14 in the trunnion 15 of 222 so as to rotate integrally with the drive rod 29, and a synchronous cable 267 is wound around the pulleys 264a and 265a. .

  As described above, conventionally, in each trunnion 15, one synchronization cable is used for each adjacent pair, and a total of four synchronization cables 262, 263, 266, 267 forcibly swing each trunnion 15. (See, for example, Patent Documents 1 to 3).

  By the way, as described above, the synchronization cable 266 (267) that is stretched over the pulleys 264 (265) and 264a (265a) of the trunnion 15 to perform forced synchronization is generally as shown in FIG. The wire rope W is composed of a wire rope W and an arcuate tube 320 that is fixed to or fastened to the wire rope W so as to connect the wire rope W in, for example, an 8-shaped endless loop. The synchronous cable 266 (267) is connected to the tube 320 in the locking groove 330 (see FIG. 9) of the pulleys 264 (265) and 264a (265a) provided on the trunnion 15 side (drive rod 29) as described above. And the movement of the trunnions 15 are synchronized by the contact between the end surface 320a of the tube 320 and the end surface 330a of the locking groove 330 (see FIG. 10).

Japanese Patent No. 3675263 JP 2005-214318 A JP 2006-189091 A

  However, in the structure in which the tube 320 is mounted on the wire rope W and the tube 320 is locked in the locking groove 330 of the pulleys 264 (265) and 264a (265a) as described above, a separate mounting component called the tube 320 is used. In addition, since the locking groove 330 must be formed in the pulleys 264 (265) and 264a (265a), the number of parts increases and the parts cost increases, and the processing cost also increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a toroidal-type continuously variable transmission and a method for attaching a synchronous cable that can attach a synchronous cable to a pulley with an inexpensive structure.

An input side disk and an output side disk that are supported concentrically and rotatably with the respective inner side surfaces facing each other, a plurality of power rollers sandwiched between these two disks, and the input side A plurality of trunnions that pivot about a pair of pivots that are concentrically provided to each other and are concentrically arranged with respect to the central axis of the disk and the output side disk, and that rotatably support the power rollers; A toroidal type comprising: a driving device for displacing each trunnion in the axial direction of the pivot; and a synchronization cable for transmitting one of the trunnions to another trunnion to synchronize both trunnions. the continuously variable transmission, the bent deformable crimping pulley provided on the trunnion side has a pair of slits on either side The has the synchronization cable, characterized in that the crimped portion to the front Kipu over Li is fastened directly by being bent and deformed inwardly toward the circumferential groove side.

  In the invention described in claim 1, since the synchronous cable is directly fastened to the pulley by caulking, there is no need to provide an additional member such as a fastening tube in the synchronous cable. Moreover, it is not necessary to process a groove or the like for locking such a member to the pulley. Therefore, the number of parts can be reduced to reduce the part cost, and the processing cost can be greatly reduced. Moreover, in the said structure, backlash with a tilting operation | movement of a synchronous cable and a trunnion can be decreased. That is, in the conventional structure, the locking groove provided in the pulley and the tube for fastening the synchronous cable are fitted with each other. . However, according to the above configuration of the present invention, since the synchronous cable is directly crimped and attached to the pulley, such a backlash does not occur. Therefore, the tilt synchronization function is improved.

Moreover , since the crimping part which can be bent and deformed has a pair of slits on both sides, the caulking work becomes easy.

Further, the synchronous cable mounting method described in claim 2 includes an input side disk and an output side disk that are supported concentrically and rotatably with their respective inner surfaces facing each other, and both of these. A plurality of power rollers sandwiched between the disks, and swing around a pair of pivots that are concentric with each other and are twisted with respect to the center axis of the input side disk and the output side disk. A plurality of trunnions that rotatably support the power rollers, a driving device that displaces the trunnions in the axial direction of the pivot, and a swing operation of one of the trunnions is transmitted to another trunnion. And a synchronization cable for synchronizing both of these trunnions with a toroidal continuously variable transmission. A sync cable attachment method for attaching relative pulley provided on the pulley provided on the trunnion side has a bent deformable crimping portion having a pair of slits on either side, the synchronization The cable is directly fastened to the pulley by bending and deforming the caulking portion toward the circumferential groove side inward .

In the invention described in claim 2 , the same effect as that of the invention described in claim 1 can be obtained.

  According to the toroidal-type continuously variable transmission and the method of attaching the synchronous cable of the present invention, the synchronous cable is directly crimped and attached to the pulley, so the synchronous cable is attached to the pulley with an inexpensive structure. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The feature of the present invention lies in the structure form of trunnion synchronization, and the other configurations and operations are the same as the conventional configurations and operations described above. Therefore, only the features of the present invention will be described below. The other parts are simply described with the same reference numerals as in FIGS.

  FIG. 1 shows an embodiment of the present invention. As shown in the drawing, in this embodiment, the pulleys 264 (265) and 264a (265a) provided on the trunnion 15 side of the first cavity 221 and the second cavity 222 are swung by one trunnion 15. Is transmitted to the other trunnion 15, and synchronization cables 262, 263, 266. 267 are synchronized between the one trunnion 15 and the other trunnion 15.

  In this case, on the pulleys 264 (265) and 264a (265a), as shown in FIG. 2, two circumferential grooves (two grooves) 380 and 382 on which two corresponding synchronous cables are stretched are formed. In addition, caulking portions 400 and 402 for mounting the synchronous cable directly by caulking are provided on the first circumferential groove 380 side and the second circumferential groove 382 side, respectively. Each of these caulking portions 400 and 402 has a pair of slits S on both sides, so that it can be easily bent and deformed inward toward the circumferential groove.

  Therefore, in such a configuration, as shown in FIG. 3, the synchronous cables 262, 263, 266.267 corresponding to the respective circumferential grooves 380, 382 of the pulleys 264 (265), 264a (265a) are spanned, and the state Thus, the caulking portions 400 and 402 are caulked to fix the synchronous cable to the pulley.

  As described above, in this embodiment, since the synchronous cables 262, 263, 266.267 are directly fastened to the pulleys 264 (265), 264a (265a) by caulking, There is no need to provide an additional member such as a tube in the synchronous cable, and there is no need to process a groove or the like for locking such a member to the pulley. Therefore, the number of parts can be reduced to reduce the part cost, and the processing cost can be greatly reduced. Further, in the above configuration, it is possible to reduce backlash between the synchronous cables 262, 263, 266.267 and the tilting operation of the trunnion 15. That is, in the conventional structure, the locking groove provided in the pulley and the tube for fastening the synchronous cable are fitted with each other. . However, according to the above-described configuration of the present invention, since the synchronous cables 262, 263, 266.267 are directly caulked and attached to the pulleys 264 (265), 264a (265a), such backlash occurs. There is no. Therefore, the tilt synchronization function is improved. Further, in the present embodiment, since the bendable deformable caulking portions 400 and 402 having a pair of slits S on both sides are provided on the pulleys 264 (265) and 264a (265a), the caulking work is facilitated. .

  In the above embodiment, the two synchronous cables (front and rear, left and right) are stretched over the pulleys 264 (265) and 264a (265a) and caulked, but only the single synchronous cable is spanned. May be. That is, in the present invention, there is no limit to the number of synchronous cables that are stretched around the pulley.

  The present invention can be applied to various forms of toroidal continuously variable transmissions.

It is the schematic of the synchronous cable structure which concerns on embodiment of this invention. It is a perspective view of the pulley which concerns on embodiment of this invention. It is a perspective view which shows the state which spanned the synchronous cable over the pulley of FIG. It is sectional drawing which shows an example of the specific structure of the toroidal type continuously variable transmission conventionally known. It is sectional drawing which follows the AA line of FIG. It is principal part sectional drawing which shows an example of the spanning structure of the conventional synchronous cable. It is a schematic diagram which shows the spanning form of a synchronous cable. It is a perspective view of the conventional synchronous cable. It is a perspective view of the conventional pulley. It is a perspective view which shows the state which spanned the synchronous cable of FIG. 8 on the pulley of FIG.

Explanation of symbols

2 Input side disk 3 Output side disk 11 Power roller 15 Trunnion 262, 263, 266.267 Synchronous cable 264 (265), 264a (265a) Pulley 400, 402 Clamping part S Slit

Claims (2)

An input side disk and an output side disk that are supported concentrically and rotatably with the respective inner side surfaces facing each other, a plurality of power rollers sandwiched between these two disks, and the input side A plurality of trunnions that pivot about a pair of pivots that are concentrically provided to each other and are concentrically arranged with respect to the central axis of the disk and the output side disk, and that rotatably support the power rollers; A toroidal type comprising: a driving device for displacing each trunnion in the axial direction of the pivot; and a synchronization cable for transmitting one of the trunnions to another trunnion to synchronize both trunnions. In a continuously variable transmission,
The pulley provided on the trunnion side has a bendable deformable caulking portion having a pair of slits on both sides,
Wherein the synchronization cable, toroidal-type continuously variable transmission, characterized in that it is fastened directly by the crimped portion previously for Kipu over Li is bent and deformed inwardly toward the circumferential groove side. An input side disk and an output side disk that are supported concentrically and rotatably with the respective inner side surfaces facing each other, a plurality of power rollers sandwiched between these two disks, and the input side A plurality of trunnions that pivot about a pair of pivots that are concentrically provided to each other and are concentrically arranged with respect to the central axis of the disk and the output side disk, and that rotatably support the power rollers; A toroidal type comprising: a driving device for displacing each trunnion in the axial direction of the pivot; and a synchronization cable for transmitting one of the trunnions to another trunnion to synchronize both trunnions. Synchronous cable for attaching the synchronous cable to a pulley provided on the trunnion side in a continuously variable transmission A mounting method,
The pulley provided on the trunnion side has a bendable deformable caulking portion having a pair of slits on both sides,
A method of attaching a synchronous cable, wherein the synchronous cable is directly fastened to the pulley by bending and deforming the caulking portion toward the circumferential groove inward .

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