JPS62124347A - Torque cam device - Google Patents

Abstract

PURPOSE:To prevent inclination of a cam roller and to generate even thrust by supporting the inside rotating shaft portion of a cam roller on a cage, and supporting the outer peripheral surface of the cam roller on a cylindrical portion which has the spherical inner peripheral surface of a curvature equal to that of the outer peripheral surface of the cam roller and is projected on an input and output member. CONSTITUTION:A shaft portion 10a projected on the inner peripheral side of a cam roller 10 is rotatably supported in a fitting hole 11a of a cylindrical cage 11 disposed between a movable sheave 4 and a torque flange 5. A spherical surface 10b of a curvature equal to that of the inner peripheral surface of a cylindrical portion 7 projected to the movable sheave on a torque cam flange 5 is formed on the outer peripheral side of the cam roller 10, and brought into contact with the inner peripheral surface of the cylindrical portion 7. In this arrangement, the cam roller 10 is prevented from inclining in the axial direction and in the peripheral direction, so that even thrust can be applied to the movable sheave 4.

Description

Detailed Description of the Invention: Industrial Fields of Application The present invention is applicable to ■torque cam devices used in belt type continuously variable transmissions, toroidal type continuously variable transmissions, etc., particularly floating type torque cams in which the cam roller is not attached to the shaft; It is related to the device.

Conventional technology and its problems Conventionally, as a floating torque cam device that generates a thrust (axial pressure) proportional to input torque, for example, Japanese Patent Laid-Open No. 5
Publication No. 0-175666 G This publication discloses a system in which a plurality of conical cam rollers are arranged between opposing cam races on the input side and output side, and the outer periphery of these cam rollers is prevented from coming out with a cover ring. ing. In this case, although the position of the cam roller is regulated in the radial direction by the cover ring, there is no positioning in the circumferential direction (there is a problem of variation in the contact points between the solid cam roller and the cam race). .

The above problem can be solved to some extent by arranging a disc-shaped retainer between the input and output side cam races, and holding the cam roller in the radial and circumferential directions using retaining holes provided in the retainer. However, even in this case, there is a clearance between the holding hole and the cam roller, so when sudden torque fluctuations act on the cam race, the cam roller tilts within the holding hole, making it impossible to generate an even thrust force. was there.

Purpose of the Invention The present invention has been made in view of such conventional problems.
The purpose is to provide a torque cam device that can always generate an even thrust force by regulating the inclination of the cam roller even when sudden torque fluctuations occur.

Structure of the Invention In order to achieve the above object, the present invention comprises input and output members arranged on the same axis and movable relative to each other in the axial and rotational directions, and cams provided on opposing surfaces of the input and output members. In a torque cam device that includes a surface and a plurality of cam rollers arranged between the cam surfaces and provides a thrust force to an output member according to the input torque of the input member, the cam roller is provided protruding from the inner peripheral side of the cam roller between the input and output members. A cylindrical retainer that rotatably supports the shaft is arranged, the outer circumferential surface of the retainer contacts and supports the inner circumferential surface of the cam roller, and a cylindrical portion that covers the outer circumferential side of the cam roller is protruded from the input member or the output member. A spherical surface having the same curvature as the inner circumferential surface of the cylindrical portion is formed on the outer circumferential surface of the cam roller, and the spherical surface is supported in contact with the inner circumferential surface of the cylindrical portion.

In other words, the axial inclination of the cam roller is regulated by the hole in the retainer that rotatably supports the shaft of the cam roller and the outer circumferential surface of the retainer that contacts and supports the inner circumferential surface of the cam roller. , the hole in the retainer and the inner peripheral surface of the cylindrical portion that contact and support the outer peripheral spherical surface of the cam roller are regulated.

DESCRIPTION OF THE EMBODIMENTS Figures 1 to 3 show an example in which the torque cam device according to the present invention is applied to the drive side boob of a V-belt type continuously variable transmission. A fixed sheave 3 and a movable sheave 4 that sandwich the heald 2 are supported. The fixed sheave 3 is spline-coupled to the input shaft 1, and the movable sheave 4 is an output member of the torque cam device.
is movable in the axial and rotational directions with respect to the input shaft 1. A torque cam flange 5, which is an input member of a torque cam device, is spline-engaged with the shaft end of the input shaft 1, and is fixed with a nut 6 to prevent removal.

A cylindrical portion 7 that protrudes toward the movable sheave 4 is integrally formed on the torque cam flange 5, and the inner periphery of this cylindrical portion 7 has, for example, three vertical grooves 7a formed therein. The above relationship? R7
A first annular cam member 8 is engaged with the first cam member 8 so as to be movable in the axial direction, and three cam portions 8a shown in FIG. 3 are formed on the side surface of the cam member 8. The second cam member 9, which has three cam surfaces 9a facing the cam surface 8a, engages with a vertical groove 43 formed in the back of the movable sheave 4.

- There are three cam rows between the cam surfaces 8a and 9a -')
A shaft portion 102 protruding from the inner circumferential side of the cam roller 10 is fitted into a fitting hole 11a of a cylindrical retainer 11 arranged between the movable sheave 4 and the torque cam flange 5. Rotationally supported. Also, cam roller 10
A spherical surface 10b having the same curvature as the inner circumferential surface of the cylindrical portion 7 is formed on the outer circumferential side of the cylindrical portion 7, and this spherical surface 10b is supported in contact with the inner circumferential surface of the cylindrical portion 7.

The cam roller lO has a change in the axial direction (
Since external forces act in the left-right direction in Figure 1) and in the circumferential direction (rotation direction in Figure 2), the cam roller IO is tilted and the cam portion 8a
, 9a may not be in accurate surface contact. However, the axial inclination is caused by the fit between the shaft portion 10a and the fitting hole 11a of the retainer 11, and the inner circumferential surface 1 of the cam roller IO.
It is regulated by line contact between 0c and the outer peripheral surface of the cage 11,
Further, the inclination in the circumferential direction is determined by the fit between the shaft portion 10a and the fitting hole 11a, and the outer peripheral spherical surface lOb of the cam roller 10 and the cylindrical portion 7.
Since the cam roller 10 is regulated by line contact with the inner circumferential surface of the
It is possible to make accurate surface contact with a.

Note that on both edges of the outer periphery of the cage 11, there are protrusions 11b,
llc is formed, and the corresponding cam part +48
．． 9 has a protrusion 8b on the inner circumferential side of the top as shown by the broken line in FIG.
, 9b are formed. The protrusions 3b and gb contact the protrusions 11b and 11i11 of the IIC of the retainer 11 when the cam roller 10 reaches the vicinity of the tops of the cam surfaces 8a and 9a, and the cam roller 10 comes into contact with the ridges 11b and 11i11 of the IIC when the cam roller 10 reaches the vicinity of the tops of the cam surfaces 8a and 9a. It prevents you from overcoming it.

1 - Inside the cam flange 5 (separately, a coil piece nose ring 12 is arranged, and this coil spring 12 is connected to the first cam member 8 via a cylindrical washer 13 to the cam roller 1
It gives a biasing force in the 0 direction.

Accordingly, the cam roller 10 is held between the two cam members 8.9, and the cam roller 10 is in contact with the cam surfaces 3a, 9a with a constant contact pressure. The above spring 1
2 is the cam roller 10 and the cam surfaces 3a and 9a as described above.
In addition to giving E (contact with), ■ Heald 2 to movable sheave 4
It also has the function of giving an initial 1tJl lltg force that does not loosen, and since the amount of waste of the coil spring 12 is exactly constant regardless of the displacement of the movable sheave 4, the initial 11J11it:force of the movable sheave 4 is It does not change.

Next, the operation of the torque cam device having the above structure will be explained.

First, when the input shaft 1 is stopped, no input torque acts on the torque cam flange 5 that is integrally connected to the input shaft 1, so that the cam roller 10 moves toward the cam surface 3a as shown in the upper half of FIG.

It is located at the bottom of the sheave 9a, and only the spring force of the coil spring 12 acts on the movable sheave 4 as an initial force.

Now, when input torque is applied to the input shaft 1, the heald tension is insufficient with the initial flt and force, and the belt 2 slips relative to the sheaves 3 and 4. However, at this time, the movable sheave 4 deviates relative to the fixed sheave 3, and due to this delay, the second cam member 9, which rotates integrally with the movable sheave 4, shifts from the first cam member 8, which rotates integrally with the fixed sheave 3.
relative rotation in the opposite direction to the rotation direction of the input shaft 1,
As a result, the cam roller 10 rides on the cam surfaces 8a and 9aC, and the cam surface 9a, that is, the movable sheave 4 is moved onto the fixed sheave 3.
Press +l'l. Possible due to this pressing force J Sheave 4
A heald tension force (CHt force) corresponding to the input torque is applied to the heald 2, and torque is transmitted to the heald 2 by the sheaves 3 and 4 without slipping.

Note that the one-herc cam device of the present invention is not limited to the above structure; for example, the cylindrical portion 7 may be connected to the torque cam flange 5.
(input member) may be provided on the movable sheet 4 (output member), and the cam surfaces 8a and 9a may be provided on the
It may be formed integrally with the cam flange 5 and the flexible J sheave 4. However, if the cam member 8°9 having the cam surfaces 3a and 9a is formed separately as in the embodiment, the cam surfaces 3a and 9a
Processing of 9a becomes easy and manufacturing costs can be reduced.

Further, the torque cam device of the present invention is as shown in the embodiment.
, not only the drive pulley of the Le 1 continuously variable transmission, but also the slave +J
It can also be used for the j-side pulley, and can be applied to any device that requires a 11F force corresponding to 1-lux, such as a tro-to-idal continuously variable transmission.

As is clear from the explanation of ``Invention Nori J Kai'', according to this research, cam t
] - The axial direction (ψ, ka, l) The shaft of the cola is rotatably supported (7) by the hole in the holder and the outer circumferential surface of the holder that contacts and supports the inner circumferential surface of the cam!cola. Since the circumferential inclination of the cam roller is regulated by the hole in the retainer and the inner circumferential surface of the cylindrical part that contacts and supports the outer spherical surface of the cam roller, each cam roller maintains proper contact with the cam surface. It is possible to generate uniform thrust at all times.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an example of a torque cam device according to the present invention applied to a Bell) type continuously variable transmission, and Figs. FIG. l...Input shaft, 2...V health], 3...Fixed sheave, 4...Movable soap (output part (wa, 5'=-1-
Luccam flange (input member), 7...Cylindrical part, 8a
, 9a... cam surface, 10... cam roller, 10a...
...Shaft part, 10b... Spherical surface, lOc... Inner peripheral surface, 1
1... Retainer, 11a... Fitting hole, 12... Coil spring. Applicant: Representative of Da Ihatsu Co., Ltd.
Patent Attorney Hidetaka Yui Figure 1 Figure 2 Figure 3 Procedural Amendments January 20, 1986

Claims (1)

[Claims] (1) Input and output members arranged on the same axis and movable relative to each other in the axial and rotational directions, cam surfaces provided on opposing surfaces of the input and output members, and a plurality of cam surfaces arranged between the cam surfaces. In a torque cam device that is equipped with a cam roller and provides a thrust force to an output member according to the input torque of an input member, a cylindrical retainer is arranged between the input and output members to rotatably support a shaft portion protruding from the inner circumferential side of the cam roller. The outer circumferential surface of the retainer contacts and supports the inner circumferential surface of the cam roller, and a cylindrical portion that covers the outer circumferential side of the cam roller is provided protrudingly on the input member or the output member, and the inner circumferential surface of the cylindrical portion is provided on the outer circumferential surface of the cam roller. 1. A torque cam device characterized in that a spherical surface having the same curvature is formed, and the spherical surface is supported in contact with the inner circumferential surface of a cylindrical portion.