JPH06280958A - Continuously variable transmission with friction wheel - Google Patents

Abstract

PURPOSE:To prevent the shank of a piston from touching a hole in a cylinder body even though the piston shank deforms with deformation of a roller supporting member used by a thrust force. CONSTITUTION:A pair of friction rollers 22 are installed in such a way as in frictional contact with an input disc and an output disc, and a pair of roller supporting members 83 to support rotatably these friction rollers 22 through an eccentric shaft 80 are borne rotatably and movably in the axial direction by spherical bearings 110, 112 in the upper rotary shaft parts 83a and lower rotary shaft parts 83b perpendicularly intersecting the axes of the two discs. The spherical bearings 110, 112 are supported by links 114, 118 so that the spacing of the rotary shaft parts 83b is greater than the spacing of the rotary shaft parts 83a. On the rotary shaft part 83b side, a piston 124 is installed which can drive them in the axial direction, being inserted in a hole 130 in the cylinder body 126, and the shank 124a of the piston is in the inclined state in the initial period.

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 Utility Model Laid-Open No. 63-92856. The friction wheel type continuously variable transmission shown therein includes an input disc, an output disc, a friction roller arranged in frictional contact with both discs in a toroidal groove formed by the discs, and a friction roller. And a roller supporting member for rotatably supporting the roller via an eccentric shaft. The roller support members are supported by spherical bearings at upper and lower rotary shaft portions orthogonal to the rotary shafts of both discs so as to be rotatable and movable in the axial direction of the rotary shaft portions. Each spherical bearing is supported by a link. The dimension between the pair of spherical bearings is the same vertically. A piston, which is fixed to the rotary shaft portion of the roller support member in the same manner as and integrally with the rotary shaft portion, is fitted into the cylinder to form a hydraulic cylinder device. The piston is movable in the axial direction of the piston by the hydraulic pressure in the cylinder of the hydraulic cylinder device, whereby the roller support member is movable in the axial direction of the rotary shaft portion.
Further, the piston can be integrally rotated by the rotation of the roller supporting member.

[0003]

However, in the above-mentioned conventional friction wheel type continuously variable transmission, when a force for pushing the friction roller from the input / output disk is applied to the friction roller, the roller supporting member with the center of the spherical bearing as a fulcrum. Deforms (curves).
As a result, the piston, which is integrally fixed to the rotary shaft portion, is inclined with respect to the axis of the cylinder. The amount of deformation of the lowermost end of the piston, which is far from the point of application of the force applied to the roller support member, becomes considerably large, so that the piston twists the cylinder body, which adversely affects the movement of the roller support member. The present invention aims to solve such problems.

[0004]

The present invention solves the above-mentioned problems by making the distance between the spherical bearings of one of the pair of roller support members larger than the distance between the other spherical bearings. That is, the friction wheel type continuously variable transmission according to the present invention is arranged so as to make frictional contact with the input disc (18), the output disc (20), and a toroidal groove formed by the both discs. A pair of friction rollers (22) and a pair of friction rollers (22) with an eccentric shaft (8
0) and the upper and lower rotary shafts (83a, 83b) orthogonal to the shaft centers of both disks are rotatable by spherical bearings (110, 112) and the rotary shafts (83a, 83b). ) A pair of roller supporting members (83) supported so as to be movable in the axial direction, and a piston provided on one rotating shaft portion (83b) of the roller supporting member (83) and capable of being driven in the axial direction. (124)
And a roller supporting member (83)
The pair of spherical bearings (112) on the side of the one rotating shaft portion (83b) are supported and coupled to each other, and one link (118) supported by the link post (120) at the central portion and the roller The pair of spherical bearings (110) on the other rotating shaft portion (83a) side of the supporting member (83).
The other link (11) is supported and connected to each other, and the center part is supported by the link post (116).
4), and one of the links (1
18), the dimension between the pair of spherical bearings (112) on the side of the one rotating shaft portion (83b) supported and connected to each other is determined by the other rotating shafts supported and connected to each other by the other link (114). It is characterized in that it is set larger than the dimension between the pair of spherical bearings (110) on the side of the portion (83a). The numbers in parentheses above are reference numerals of corresponding members in the embodiments described later.

[0005]

The distance between the spherical bearings on the side of one rotating shaft of the pair of roller support members is set larger than the distance between the spherical bearings on the side of the other rotating shaft. As a result, the distance between the roller support members on the side of the other rotary shaft is narrow, and the distance increases toward the side of the one rotary shaft, so the shaft of the piston connected to the one rotary shaft is also the same. Lean to. When a thrust force is applied to the friction roller during operation, the pair of roller support members are deformed in a direction away from each other, and the shaft portion of the piston is inclined in the direction opposite to the initial inclination. For this reason,
The shaft of the piston never touches the cylinder body.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a friction wheel type continuously variable transmission. Input shaft 1
4 is a ball bearing 65 and a needle bearing 66
It is rotatably supported by the casing 67 via.
An output disk 20 is rotatably supported on the input shaft 14 via a bearing 73. The output disc 20 is provided with output gears 26 so as to rotate integrally via keys 74 arranged at two symmetrical positions. The gear 26 has a casing 67 via a ball bearing 75.
Supported by. An input disk 18 is provided on the input shaft 14 via a bearing 76 so as to be rotatable and axially movable. The back side of the input disk 18,
That is, the cam flange 77 is provided on the side opposite to the side facing the output disk 20. The cam flange 77 is spline-coupled to the input shaft 14 and
The shoulder 78 prevents the movement to the left in the figure. A cam roller 79 is provided between the cam surfaces 18a and 77a of the input disk 18 and the cam flange 77 which face each other. Cam surfaces 18a and 77a and cam roller 7
The reference numeral 9 has a shape such that when the cam flange 77 and the input disk 18 rotate relative to each other, a force for pressing the input disk 18 to the right in the drawing is generated. Input disk 1
8 and the friction roller 22 disposed in the toroidal groove formed by the surfaces of the output disk 20 facing each other are rotatably supported by the eccentric shaft 80 via the bearing 81. The friction roller 22 is supported in the thrust direction by a ball bearing 82. The eccentric shaft 80 and the ball bearing 82 are supported by a roller support member 83.

FIG. 2 is a simplified sectional view taken along line 2-2 of FIG. The roller support member 83 rotatably supports the friction roller 22, and is rotatably and vertically movable by spherical bearings 110 and 112 on the upper and lower rotary shaft portions 83a and 83b. The pair of spherical bearings 110 are connected by a link 114, and the link 114 is supported by a link post 116 fixed to the casing 67. The pair of spherical bearings 112 are also supported by the link 118,
The link 118 is supported by the link post 120. A piston 124 is provided integrally with the lower end of the rotary shaft portion 83b. The piston 124 is a piston insertion hole 1 formed by a cylinder body 126.
It is fitted within 30. The piston 124 and the piston insertion hole 130 of the cylinder body 126 constitute a hydraulic cylinder device for axially moving the rotary shaft portion 83b. A clearance for lubricating oil sealing is provided by a seal ring (not shown) between the shaft portion 124a protruding below the piston 124 and the cylinder body 126. The length dimension L2 of the link 118 supporting between the lower left and right rotating shaft portions 83b is equal to the length of the link 114 supporting between the upper right rotating shaft portions 83a.
Is set larger than the length dimension L1. As a result, the shaft portion 124a of the piston 124 is in an inclined state as shown in the figure in the initial state. That is, in FIG. 2, the shaft portion 124a and the cylinder body 12 are
The dimension n1 to the outside of the hole of No. 6 is smaller than the dimension n2 to the inside of the hole of the shaft portion 124a and the cylinder body 126.

The operation of this embodiment will be described. When a thrust force is applied to the friction roller 22 during operation, the force is also applied to the roller support member 83 that supports the friction roller 22. As a result, the roller support member has the spherical bearing 1 in the rotating shaft portion 83a.
10 is used as a fulcrum, and in the rotating shaft portion 83b, the spherical bearing 112 is used as a fulcrum to deform so as to bulge outward in FIG. As a result, the shaft portion 124a on the left side in FIG.
It deforms so as to rotate counterclockwise around the spherical bearing 112. That is, the shaft portion 124a deforms in a direction in which the dimension n1 and the dimension n2 are equal. Therefore, the shaft portion 124a does not come into contact with the hole of the cylinder body 126.

[0009]

As described above, according to the present invention, the pair of roller supporting members are arranged such that the distance between one of the rotary shaft portions is larger than the distance between the other rotary shaft portions. By supporting, the shaft portion of the piston can be tilted in a predetermined direction in advance. As a result, a thrust force is applied to the friction roller, the roller support member is deformed, and even if the piston shaft section is tilted in the direction opposite to the above-mentioned predetermined direction, the piston shaft section will prune the surface of the hole of the cylinder body. However, the movement of the roller support member is not adversely affected.

[Brief description of drawings]

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

2 is a simplified cross-sectional view taken along the line 2-2 of FIG.

[Explanation of symbols]

 18 Input Disc 20 Output Disc 22 Friction Roller 80 Eccentric Shaft 83 Roller Support Member 83a, 83b Rotating Shaft 110, 112 Spherical Bearing 114, 118 Link 116, 120 Link Post 124 Piston

Claims (1)

[Claims] 1. An input disc (18), an output disc (20) and a pair of friction rollers (22) arranged in frictional contact with both discs within a toroidal groove formed by the discs. And a pair of friction rollers (22) are rotatably supported via an eccentric shaft (80), and spherical bearings (110, 110) are respectively provided on the upper and lower rotary shaft portions (83a, 83b) orthogonal to the shaft centers of both discs. 112) a pair of roller supporting members (83) rotatably supported by the rotating shaft parts (83a, 83b) so as to be movable in the axial direction, and one rotating shaft part (83b) of the roller supporting member (83). ), Which can be driven axially (12
4) and a rotating shaft portion (83) of the roller supporting member (83).
The pair of spherical bearings (112) on the side b) are supported and connected to each other, and the center portion is linked to the link post (120).
The one link (118) supported by the roller support member (83) and the other pair of the spherical bearings (110) on the other rotation shaft portion (83a) side of the roller support member (83) are supported and connected to each other, and the center portion thereof is a link post. In a friction wheel type continuously variable transmission having the other link (114) supported by (116), the one side of the rotating shaft portion (83b) side supported and connected to each other by the one link (118) is provided. The dimension between the pair of spherical bearings (112) is determined by the other link (11).
4) is set larger than the dimension between the pair of spherical bearings (110) on the side of the other rotating shaft portion (83a) that are supported and connected to each other by 4). .