JPH04321855A - Frictional wheel type continuously variable transmission - Google Patents

Abstract

PURPOSE:To prevent the horizontal force from being directly applied to a bolt for fixing a spherical ring when the horizontal force is applied from a roller support member to a link. CONSTITUTION:A roller support member 83 which supports a frictional roller 36 is supported by a link 118 through a spherical bearing 112, and the horizontal movement of the link 118 is regulated by the sppherical ring 120. The spherical ring 120 is fitted to a support shaft portion 202 formed on a control valve body 200 up to the position crossing the center of the spherical surface and fixed to the support shaft portion 202 from the upper end by a bolt 204.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction wheel type continuously variable transmission.

0002

2. Description of the Related Art A conventional friction wheel type continuously variable transmission is disclosed in Japanese Unexamined Patent Publication No. 1-216158. The friction wheel type continuously variable transmission shown in this figure includes an input disk, an output disk, a friction roller disposed in a toroidal groove formed by both disks and in frictional contact with both disks, and a friction roller. a roller support member rotatably supported via an eccentric shaft and rotatably supported by a spherical bearing at a rotating shaft part perpendicular to the rotating shafts of both disks and movable in the axial direction of the rotating shaft part; It has a link that holds the bearing and a lower link post that supports the link. The lower link post is attached to the control valve body via bolts.

0003

[Problems to be Solved by the Invention] However, in the conventional friction wheel type continuously variable transmission described above, when a horizontal force is applied to the link, a horizontal force is also applied to the lower link post supporting the link. Since this force is supported only by the bolt, a bending moment is generated in the bolt. In order to withstand this moment, it is necessary to use bolts with a large diameter, which is an impediment to efforts to reduce weight and downsize. The present invention aims to solve these problems.

0004

The present invention solves the above problems by supporting the link with a spherical ring and supporting the spherical ring by a support shaft formed in a structure such as a control valve body. That is, the present invention provides input disks (26, 32) and output disks (2
8, 34), a friction roller (30, 36) disposed in a toroidal groove formed by both disks so as to be in frictional contact with both disks, and a friction roller rotatably supported via an eccentric shaft. At the same time, a roller support member (83) is rotatably supported by spherical bearings (110, 112) at the rotating shaft portion (83a, 83b) perpendicular to the axes of both disks and movable in the axial direction of the rotating shaft portion.
and links (114, 118) that support the spherical bearing.
Structures such as casings and control valve bodies (
The spherical ring (120) is fixed to the spherical ring (200), and the spherical ring restricts the movement of the link by fitting the spherical surface provided on the outer periphery into the hole provided in the link. In the friction wheel type continuously variable transmission, the spherical ring has support holes (1
20a) is provided, and the support shaft portion (202) of the structure is fitted into this support hole, and the fitting portion between the support hole and the support shaft portion is the same as that of the spherical ring when viewed from the structure side. It has reached a position beyond the spherical center position (C),
The spherical ring is attached to the support shaft by a bolt (204) screwed into a threaded hole in the support shaft portion through a mounting hole (120b) that passes between the surface on the opposite side of the structure and the inner part of the support hole. It is characterized by being fixed to the part. Note that the numbers in parentheses above are the codes of corresponding members in the embodiments described later.

[0005]

[Operation] By fitting the spherical ring to the support shaft formed on a control valve or the like, the horizontal force applied to the spherical ring from the link is supported by the support shaft. As a result, no force is directly applied to the bolts fixing the spherical ring to the support shaft.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a friction wheel type continuously variable transmission. A first continuously variable transmission mechanism 22 and a second continuously variable transmission mechanism 24 are provided within the casing 10. The first continuously variable transmission mechanism 22 includes an input disk 26, an output disk 28, and a pair of friction rollers 30 that transmit rotational force between them. The contact surfaces of the input disk 26 and the output disk 28 with the friction roller 30 are toroidal surfaces. By changing the contact state of the friction roller 30 with respect to the input disk 26 and the output disk 28, the rotational speed ratio of the input disk 26 and the output disk 28 can be continuously changed. The second continuously variable transmission mechanism 24 also includes an input disk 32, an output disk 34, and a pair of friction rollers 36 similar to those of the first continuously variable transmission mechanism 22. However, input disk 32
The arrangement of the output disk 34 is similar to that of the first continuously variable transmission mechanism 22.
It is the opposite. That is, the output disk 28 and the output disk 34 are arranged adjacent to each other. The input disk 26 is supported on the outer periphery of the input shaft 38 via a ball spline. The input shaft 38 is connected to a forward/reverse switching mechanism and a torque converter (not shown), and is configured so that the rotational force of the engine is inputted therethrough. A cam flange 42 is arranged on the back side of the input disk 26. A cam roller 46 is provided on the mutually opposing cam surfaces of the cam flange 42 and the input disk 26.
is provided. The cam roller 46 is connected to the input disk 26
The cam flange 42 is shaped to generate a force that presses the input disk 26 toward the output disk 28 when the cam flange 42 and the cam flange 42 rotate relative to each other. The input disk 32 of the second continuously variable transmission mechanism 24 is also connected to the input shaft 38 via a ball spline. The input disk 32 receives a force directed toward the output disk 34 by a dish plate 51 that receives a compressive force from a loading nut 50 screwed into the input shaft 38. The output disk 28 of the first continuously variable transmission mechanism 22 and the output disk 34 of the second continuously variable transmission mechanism 24 are each rotatably supported by an input shaft 38 via needle bearings. A drive gear 55 is provided to rotate together with the output disks 28 and 34. The drive gear 55 is an intermediate shaft 5 arranged parallel to the input shaft 38.
9 is meshed with a driven gear 60 connected to one end of the gear 9 by a spline so as to rotate together.

FIG. 2 shows a sectional view of a portion of the second continuously variable transmission mechanism 24 (the basic configuration of the first continuously variable transmission mechanism 22 is also that of the second continuously variable transmission mechanism 24 shown in FIG. 2). ). The roller support member 83 has upper and lower rotating shaft parts 83
a and 83b are rotatably and vertically movably supported by spherical bearings 110 and 112. The spherical bearing 110 is supported by a link 114, which is supported by a link post 116 fixed to the casing 10. In addition, the spherical bearing 11
2 is also supported by a link 118, and this link 118
is supported by a spherical ring 120 and its movement in the horizontal direction is restricted. The spherical ring 120 is fitted into a support shaft portion 202 formed on a control valve body 200 (structure), and is fixed to the support shaft portion 202 from the upper end of the spherical ring 120 with bolts 204 . That is, the spherical ring 120 has a stepped through hole, that is, a lower large diameter support hole 120.
A and an upper small-diameter mounting hole 120b are provided, and the support shaft portion 202 is fitted into the support hole 120a.
Further, a bolt 204 passes through the mounting hole 120b and is screwed into a threaded hole in the support shaft portion 202. Support hole 12
The fitting part between 0a and the support shaft part 202 is the spherical ring 1
It reaches above the spherical center position C of No. 20. That is, the upper end of the support shaft portion 202 is located above the position where the outer spherical surface of the spherical ring 120 contacts the hole of the link 118. The roller support member 83 is connected to the rotating shaft portion 8
It has an extended shaft portion 83c provided concentrically with 3b. Note that the extension shaft portion 83c is configured to rotate together with the rotation shaft portion 83b. A piston 124 is provided on the outer periphery of the extended shaft portion 83c. The piston 124 is inserted into a piston insertion hole 302 formed in the control valve body 300. Oil chambers 304 and 306 are formed above and below the piston 124 in the piston insertion hole 302, and the piston 124 is
can move up and down.

Next, the operation of the above embodiment will be explained. The piston 124 moves in the vertical direction by controlling the oil pressure in oil chambers 304 and 306 above and below the piston 124. As a result, the direction of the tangential force acting on the friction rollers 30 and 36 changes, so that the roller support member 83 rotates around the rotating shaft portions 83a and 83b. As a result, the roller support member 83 applies a horizontal force to the link 118 (it also applies an opposite horizontal force to the link 114). Since the horizontal movement of the link 118 is restricted by the spherical ring 120, a force is applied to the center of the spherical surface of the spherical ring 120 in the horizontal direction. Since the spherical ring 120 is fitted onto the support shaft 202 up to the upper side of the spherical center position C, the horizontal force is supported by the support shaft 202 . As a result, no bending moment acts on the bolt 204.

[0009]

[Effects of the Invention] As explained above, according to the present invention, the spherical ring is fitted to the support shaft of the structure to a position exceeding the center of the spherical surface and fixed with bolts, so that the spherical ring can be connected from the link to the spherical ring. The applied horizontal force is supported by the support shaft, and no force is applied directly to the bolt. This makes it possible to use bolts with a small diameter, thereby reducing the weight and size of the entire transmission.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1;

[Explanation of symbols]

26, 32 Input disks 28, 34 Output disks 30, 36 Friction roller 83 Roller support members 83a, 83b Rotating shaft portions 110, 112 Spherical bearings 114, 118 Link 120 Spherical ring 120a Support hole 120b Mounting hole 124 Piston 200 Control valve Body (structure) 202
Support shaft portion 204 Bolt C Spherical center position

Claims (1)

[Claims] 1. An input disk, an output disk, and a friction roller disposed in frictional contact with both disks within a toroidal groove formed by both disks.
a roller support member that rotatably supports the friction roller via an eccentric shaft and is rotatably supported by a spherical bearing at a rotating shaft portion perpendicular to the axes of both disks and movable in the axial direction of the rotating shaft portion; , has a link that supports a spherical bearing, and a spherical ring that is fixed to a structure such as a casing or a control valve body. In friction wheel type continuously variable transmissions, the movement of the links is regulated by fitting them into the spherical rings.
A support hole is provided in a direction perpendicular to the link, and the support shaft of the structure is fitted into this support hole, and the fitting between the support hole and the support shaft is viewed from the structure side. The spherical ring has reached a position beyond the center of the spherical surface of the spherical ring, and the spherical ring is attached to the support shaft through the mounting hole that passes between the surface on the opposite side of the structure and the inner part of the support hole. A friction wheel type continuously variable transmission characterized by being fixed to a support shaft by a bolt screwed into a screw hole.