JP2008261471A - Toroidal type continuously variable transmission and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toroidal type continuously variable transmission having excellent assembly characteristics of an intermediate wall. <P>SOLUTION: In one embodiment of the toroidal type continuously variable transmission, the intermediate wall 13 is provided with a mounting surface 210 mounted on a casing 50. A pin hole or screw hole is bored in the mounting surface 210 in an insertion direction of inserting the intermediate wall 13 into the casing 50. The intermediate wall 13 is mounted and fixed onto the casing 50 by a pin or screw member inserted into the pin hole or screw hole. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a toroidal continuously variable transmission that can be used in transmissions of automobiles and various industrial machines, and an assembling method thereof.

  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 on a partition wall (intermediate wall) 13 formed by coupling two members via an angular ball bearing 107 and is supported in the casing 50 via the partition wall 13. Thus, while being able to rotate around the axis O of the input shaft 1, displacement in the direction of the axis O 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 threaded portion 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. 4, both discs 3, 3 are sandwiched from both sides inside the casing 50 and at the side positions of the output side discs 3, 3. 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 23A and 23B is supported by support posts 64 and 68 formed on the inner surface of the casing 50 so as to be able to swing around the support posts 64 and 68 as fulcrums. 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. is 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 includes a pair of trunnions that swing around a pair of pivots (tilting axes) 14 and 14 that are twisted with respect to the input shaft 1. 15 and 15 are provided. 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. Then, the trunnions 15 and 15 form a pocket portion P that is a concave accommodation space for accommodating the power roller 11 by the bent wall portions 20 and 20. 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 central portion of the support plate portion 16, and a base end portion (first shaft portion) 23 a of a displacement shaft 23 as a support shaft 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 23A and 23B, and the pivot shafts 14 provided at both ends of the trunnion 15 are respectively provided in the support holes 18 with radial needle bearings ( A tilting bearing 30 is supported so as to be swingable (tiltable). 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. 4), 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 such thrust ball bearings 24 includes a plurality of balls (rolling elements) 26, 26, an annular retainer 27 that holds the balls 26, 26 in a freely rolling manner, and an annular outer ring 28. It consists of and. 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 (offset) in opposite directions. 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 (tilt) in opposite directions around the pivots 14 and 14 pivotally supported by the yokes 23A and 23B.

  As a result, the contact positions of the peripheral surfaces (traction surfaces) 11a and 11a of the power rollers 11 and 11 and the inner surfaces 2a and 3a change, and the rotational speed ratio between the input shaft 1 and the output gear 4 is changed. Change. 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.

  By the way, in such a conventional toroidal-type continuously variable transmission, the intermediate wall 13 is generally inserted into the casing 50 in a direction orthogonal to the input shaft 1 from the lower surface side of the casing 50, and a pin or screw member. In this case, the pin or the screw member is inserted or screwed into the intermediate wall 13 in the same direction as the axial direction of the input shaft 1. That is, conventionally, the insertion direction of the positioning pin and the screw tightening direction of the intermediate wall 13 are set to be the same as the axial direction of the input shaft 1 as shown in FIG. 4 (for example, Patent Document 1 and Patent Document 2). reference). On the other hand, the intermediate wall 13 is inserted into the casing 50 in a direction orthogonal to the input shaft 1 from the lower surface side of the casing 50.

Japanese Patent No. 2638896 Japanese Patent No. 2141223

  However, after the intermediate wall 13 is inserted into the casing 50 in the direction orthogonal to the input shaft 1 from the lower surface side of the casing 50 in this way, the pin or the intermediate wall 13 is pinned to the intermediate wall 13 in the same direction as the axial direction of the input shaft 1. In an assembly form in which a screw member is inserted or screwed, a tool and a pin and a screw member (bolts, etc.) must be inserted from the axial direction of the input shaft 1 at the time of assembly. However, there are some problems such as complicated movement of the robot and time-consuming assembly. Moreover, in the conventional structure, the attachment surface of the intermediate wall 13 and the attachment surfaces of the cylinder bodies 61 and 62 are required separately.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a toroidal-type continuously variable transmission that is excellent in assemblability of an intermediate wall.

  In order to achieve the object, the invention according to claim 1 is an input shaft that is rotatably supported in a casing and receives rotational torque, and an input that is supported by the input shaft and rotates integrally with the input shaft. An output side disk to which rotational torque is transmitted from the input side disk at a predetermined speed ratio via a power roller sandwiched between the side disk and the input side disk; and the output shaft supported by the input shaft and the output In a toroidal continuously variable transmission that includes an output gear that is coupled to a side disk and receives rotational torque from the output side disk, and an intermediate wall that rotatably supports the output gear and is mounted and supported in the casing. The intermediate wall is provided with an attachment surface to be attached to the casing, and the attachment surface has a pin hole or an insertion direction in which the intermediate wall is inserted into the casing. Di holes are provided, said pin hole or said intermediate wall by a pin or screw member which is inserted through the screw holes, characterized in that it is mounted fixed relative to the casing.

  According to a second aspect of the present invention, there is provided an input shaft that is rotatably supported in a casing and receives rotational torque, an input-side disk that is supported by the input shaft and rotates integrally with the input shaft, An output side disk to which rotational torque is transmitted at a predetermined speed ratio from the input side disk via a power roller sandwiched between the input side disk and the output side disk supported by the input shaft and coupled to the output side disk. An assembly method for a toroidal-type continuously variable transmission comprising: an output gear that receives rotational torque from a lever output side disk; and an intermediate wall that supports the output gear rotatably and is supported in the casing. Inserting the intermediate wall into the casing through a predetermined opening of the casing; and inserting the intermediate wall in the insertion direction of the intermediate wall with respect to the casing. A step of abutting the attachment surface against the mounting surface of the casing, and a pin or screw member inserted through the intermediate wall in the insertion direction of the intermediate wall with respect to the casing, and the intermediate wall with respect to the casing by the pin or screw member And a step of attaching.

  According to the present invention, the direction in which the intermediate wall is inserted into the casing is the same as the insertion direction or the tightening direction of the pins or screw members for attaching the intermediate wall to the casing. The movement of the robot can be simplified in one direction, the assembly is simple, and the assembly time can be shortened as compared with the prior art. That is, the assembly of the intermediate wall is excellent, and the productivity is improved. In addition, since the direction in which the intermediate wall is inserted into the casing matches the insertion direction or tightening direction of the pins or screw members for attaching the intermediate wall to the casing, the mounting surface of the intermediate wall and, for example, the cylinder body The mounting surface can be the same surface (the same surface on the casing). For this reason, the two reference surfaces which have conventionally been used can be made one, and both of the references can be obtained by one processing. That is, the structure can be simplified and the processing cost can be reduced. In addition, in connection with the above, for example, since the pin hole for attaching the post of the cylinder body and the pin hole for attaching the intermediate wall can be processed with one chuck, the accuracy of the product can be improved. Further, in the above configuration, since the axial position of the output side disk is determined by the position of the pin hole, it is not necessary to perform a process of providing a reference surface in the axial direction, and cost and manufacturing time can be reduced. In addition, in the conventional method in which a screw or the like is tightened against the intermediate wall in the axial direction of the input shaft, the intermediate wall sometimes falls and collides with the yoke as soon as the screws are removed. (This also causes contamination). With the mounting method of the present invention, there is no fear that the intermediate wall will fall off even when assembled.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The feature of the present invention lies in the mounting structure of the fixing means for fixing the disk and the power roller in a state where they are pressed against each other in the axial direction, and the other configuration and operation are the same as the conventional configuration and operation described above. In the following, only the characteristic part of the present invention will be referred to, and other parts will be simply described with the same reference numerals as those in FIGS.

  FIG. 1 shows a perspective view of an intermediate wall 13 of a toroidal-type continuously variable transmission according to an embodiment of the present invention. As shown in the figure, the intermediate wall 13 has attachment portions 200 attached to the casing on both sides thereof. Each attachment portion 200 has an attachment surface 210 formed on one side thereof, and this attachment surface 210 faces the insertion direction of the intermediate wall 13 with respect to the casing 50, and the attachment surface 501 of the casing 50 (FIG. 2). Reference) is attached. The mounting surface 210 has a pin hole 206 into which a pin for mounting and fixing the intermediate wall 13 to the casing 50 is inserted, and a screw hole (bolt hole or the like) into which a screw member (bolt or the like) is screwed. 202 and 204 are provided. In the present embodiment, screw holes 202, 204 are provided on both sides of one pin hole 206, and these holes 202, 204, 206 are inserted in the insertion direction X (FIG. 2) in which the intermediate wall 13 is inserted into the casing 50. (See) in the same Y direction.

  Next, an assembly method for assembling the intermediate wall 13 having the above configuration to the casing 50 will be briefly described. First, as shown in FIG. 2, the intermediate wall 13 is inserted into the casing 50 through the lower opening 50 a of the casing 50 in the X direction (direction perpendicular to the axial direction of the input shaft 1). Then, as shown in FIG. 3, the attachment surface 210 of the intermediate wall 13 is applied to the attachment surface 501 of the casing 50 in the X direction. At this time, the pin hole 206 and the screw holes 202 and 204 of the attachment surface 210 are made to coincide with the pin hole 506 and the screw holes 502 and 504 provided corresponding to the attachment surface 501, respectively. Thereafter, a pin or screw member is inserted into the pin hole 206 and the screw holes 202 and 204 drilled in the same direction Y as the X direction, and the intermediate wall 13 is attached to the casing 50 by the pin or screw member.

  As described above, in this embodiment, the direction X in which the intermediate wall 13 is inserted into the casing 50 is the same as the insertion direction or the tightening direction Y of the pins or screw members for attaching the intermediate wall 13 to the casing 50. Therefore, even in the case of mass production with a robot or the like, the movement of the robot can be simplified in one direction, the assembly is simple, and the assembly time can be shortened as compared with the prior art. That is, the assembly of the intermediate wall 13 is excellent, and the productivity is improved.

  In addition, since the direction in which the intermediate wall 13 is inserted into the casing 50 and the insertion direction or tightening direction of the pins or screw members for attaching the intermediate wall 13 to the casing 50 are matched, the attachment surface of the intermediate wall 13 210 and, for example, the mounting surfaces of the cylinder bodies 61 and 62 may be the same surface (the same surface 501 on the casing 50). For this reason, the two reference surfaces that have conventionally been used can be made one, and both of the references can be obtained by one processing. That is, the structure can be simplified and the processing cost can be reduced.

  Further, for example, the pin holes 550 (see FIG. 2) for attaching the posts of the cylinder bodies 61, 62 and the pin holes 202, 204, 206 for attaching the intermediate wall 13 can be processed with one chuck. Product accuracy can be improved.

  Further, in the above configuration, since the axial position of the output side disk 3 is determined by the positions of the pin holes 202, 204, and 206, it is not necessary to perform a process of providing a reference surface in the axial direction, thereby reducing costs and manufacturing time. Can be achieved. Further, in the prior art in which screws or the like are tightened against the intermediate wall 13 in the axial direction of the input shaft 1, the intermediate wall sometimes falls and collides with the yoke as soon as the screws are removed. However (this also causes contamination), the attachment method of the present invention does not cause the intermediate wall to drop off even when assembled.

  The present invention can be applied to various half-toroidal continuously variable transmissions such as a single cavity type and a double cavity type.

1 is a perspective view of an intermediate wall of a toroidal type continuously variable transmission according to a first embodiment of the present invention. It is a perspective view which shows the state which is going to insert an intermediate wall in a casing. It is a perspective view which shows the state which inserts and attaches an intermediate wall in a casing. It is principal part sectional drawing in the conventional toroidal type continuously variable transmission. It is sectional drawing which follows the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input shaft 2 Input side disk 3 Output side disk 4 Output gear 11 Power roller 13 Intermediate wall 50 Casing 206 Pin hole 202,204 Screw hole 210 Mounting surface

Claims (2)

An input shaft that is rotatably supported in the casing and receives rotational torque, an input-side disk that is supported by the input shaft and rotates integrally with the input shaft, and a power roller that is sandwiched between the input-side disk An output side disk to which rotational torque is transmitted from the input side disk at a predetermined speed ratio, and an output gear supported by the input shaft and coupled to the output side disk to receive the rotational torque from the output side disk And a toroidal continuously variable transmission comprising an intermediate wall that rotatably supports the output gear and is supported in the casing.
The intermediate wall is provided with an attachment surface to be attached to the casing, and the attachment surface is provided with a pin hole or a screw hole in an insertion direction for inserting the intermediate wall into the casing, and is inserted into the pin hole or the screw hole. A toroidal continuously variable transmission, wherein the intermediate wall is attached and fixed to the casing by a pin or a screw member. An input shaft that is rotatably supported in the casing and receives rotational torque, an input-side disk that is supported by the input shaft and rotates integrally with the input shaft, and a power roller that is sandwiched between the input-side disk An output side disk to which rotational torque is transmitted from the input side disk at a predetermined speed ratio, and an output gear supported by the input shaft and coupled to the output side disk to receive the rotational torque from the output side disk And an assembly method of a toroidal continuously variable transmission comprising an intermediate wall that rotatably supports the output gear and is mounted and supported in the casing,
Inserting the intermediate wall into the casing through a predetermined opening of the casing;
Applying the mounting surface of the intermediate wall to the mounting surface of the casing in the insertion direction of the intermediate wall with respect to the casing;
Inserting a pin or screw member into the intermediate wall in the insertion direction of the intermediate wall with respect to the casing and attaching the intermediate wall to the casing with the pin or screw member;
Assembling method characterized by including.

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