JPS6275170A - Torque cam device - Google Patents

Abstract

PURPOSE:To continually generate stable thrust, by providing a stopper mechanism, which restricts a turning range for input and output members, in a cam roller holder. CONSTITUTION:An input disc 3 and an output disc 4, which constitute a toroidal speed change part 2, are relatively rotatably provided on an input shaft 1 connected with an engine. Power rollers 5 are arranged between circular annular grooves 3a, 4a, and a continuously variable transmission is performed by changing a tilt of said rollers. Now if reverse torque acts on the input shaft 1, the moment cam rollers 10 separate from tilt surfaces 7b, 3b consequently tend to ride across from the tilt surface 7b, but the cam roller is prevented from riding across the tilt surface by stopper mechanism 14 restricting the turning range of a cam roller holder 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a torque cam device used in toroidal type continuously variable transmissions, belt type continuously variable transmissions, and the like.

Prior art and its problems Conventionally, as a torque cam device that generates a thrust (axial pressure) proportional to torque, for example, Japanese Patent Application Laid-Open No. 50-1756
As described in Japanese Patent No. 66, it is known that a plurality of circular tffl-shaped cam rollers are arranged between two opposing cam races, and the outer peripheries of these cam rollers are covered with a cover ring to prevent them from coming off.

In the above case, the position of the cam roller is regulated in the radial direction by the cover ring, but it is not positioned in the circumferential direction, so there is variation in the contact position between the individual cam rollers and the cam race, and the normal thrust is not achieved. There was a risk that this would not occur.

Therefore, as shown in Fig. 4, the cam roller 2o is held in the radial and circumferential directions by the holding holes 22 of the cam roller retainer 21, and the above-mentioned drawbacks are solved by regulating the relative displacement of the cam roller 2o. has been done. In this case, the cart F due to the input torque applied to the input member 23
1, an axial thrust F2 acts on the cam roller 2o via the inclined surface 23a, and this thrust F2 is applied to the output member 24.
is transmitted via the inclined surface 24a. However, when a reverse torque or the like is applied to the input member 23, the momentary force F2 becomes zero, and the cam roller 20 moves away from the inclined surfaces 23a and 24a, and the cam roller 20 moves away from the inclined surface of the input member 23, as shown by the two-dot chain line in FIG. There is a risk that it will cross over the surface 23a and become unusable. This is because the position of the cam roller retainer 21 is not restricted in any way in the rotational direction (circumferential direction) with respect to the input member 23 and the output member 24.

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 prevent a cam roller from running over an inclined surface due to sudden torque fluctuations.

Structure of the Invention In order to achieve the above object, the present invention provides an input member integrally rotatably coupled to a shaft, an output member rotatably disposed on the shaft, and an output member formed on opposing surfaces of the human output member. In a torque cam device that includes a cam roller disposed between inclined surfaces and a cam roller retainer that rotatably holds the cam roller, and generates a thrust corresponding to shaft torque on an output member, the cam roller is held on each of the input and output members. It is equipped with a stopper mechanism that restricts the rotation range of the device.

DESCRIPTION OF THE EMBODIMENTS FIGS. 1 to 3 show an example in which the torque cam device according to the present invention is applied to a toroidal continuously variable transmission, and a toroidal transmission section 2 is configured on the input shaft l connected to the engine. An input disk 3 and an output disk 4 are provided so as to be relatively rotatable.

A power roller 5 is arranged between the opposing annular grooves 3a and 4a of both disks 3 and 4, and by changing the inclination of this power roller 5, continuously variable speed is achieved, and the power of the human power shaft 1 is transferred from the input disk 3. The signal is transmitted to the output disk 4.

A torque cam device 6 is provided at the left end of the input shaft 1 to generate a thrust in the input disk (output member) 3 according to the input torque of the input shaft 1. That is, the input member 7 of the torque cam device 6 is attached to the input shaft 1 by a spline 7a so as to be movable in the axial direction.
The input shaft 1 is always biased to the right in FIG. 1 by a disc spring 9 supported at the rear by a nut 8 fixed to the end of the input shaft 1.

V-shaped inclined surfaces 7b and 3b as shown in FIG. 2a are formed on the opposing surfaces of the input member 7 and the output member 3,
Three pairs of cam rollers 10 held by a cam roller holder 11 are arranged between the inclined surfaces 7b and 3b.

The cam roller retainer 11 is made of a disc-shaped plate material as shown in FIG.
is rotatably supported. In addition, a total of 3 ([1i1] holding holes 11b are formed in the cam roller retainer 11,
The cam roller 10 can be freely rotated through this holding hole 11b.
and is held in the radial and circumferential directions. Furthermore, two notches 11C and 11d are formed in the cam roller retainer 11, and stopper pins 12 and 13 protruding from the manpower member 7 and the output member 3 in opposite directions are movably fitted into these notches ILC and lid. By matching, the cam roller holding P5
A stopper mechanism 14 is configured to restrict the rotation range of 11.

In the torque cam device 6 having the above structure, when the input shaft 1 is stopped, the cam roller 10 is at the center position of the inclined surfaces 7b and 3b as shown in FIG. It is acting on 3. When the input member 7 rotates in the direction of the arrow in FIG. 2b as the input shaft l rotates, the cam roller 10 comes into close contact with the inclined surfaces 7b and 3b, and the output member 3 rotates following the input member 7. Generates thrust according to the input torque of 1.

Now, when a reverse torque suddenly acts on the input shaft l while power is being transmitted in the state shown in Fig. 2b, the cam roller 10 moves away from the slopes 7b and 3b (lJi), and as a result, the cam roller lO moves away from the slope 7b. A similar problem may also occur when torque is suddenly applied while the input shaft l is stationary.In the present invention, a stopper mechanism 14 is provided to restrict the rotation range of the cam roller retainer l. Therefore, even if a sudden torque fluctuation occurs, the stopper pin 12.13 contacts the notch 11c and the end of the lid to restrict the movement of the cam roller retainer 11, as shown in FIG. There is no risk of overcoming from 7b or 3b.

Note that the torque cam device of the present invention is not limited to the above structure; for example, the cam roller retainer is
Similar to the cover ring described in Japanese Patent No. 175666, the cover ring may have a cylindrical shape, and the cam roller may be rotatably supported by this cam roller holder. Furthermore, the stopper mechanism is not limited to a combination of a stopper pin and a notch, but may also be composed of a stopper pin and a long hole, for example, and has a structure that can restrict the rotation range of the cam roller retainer relative to the input member and the output member. It can be anything.

Effects of the Invention As is clear from the above explanation, according to the present invention, the cam roller retainer is provided with a stopper mechanism that restricts the rotation range of the input member and the output member, so even if there is a sudden torque fluctuation, The cam roller does not go over the slope, and stable thrust can be generated at all times.

[Brief explanation of drawings]

Figure 1 is a sectional view of an example of a torque cam device according to the present invention applied to a toroidal continuously variable transmission, Figures 2a and 2b.
The figures are sectional views taken along the line U--U in FIG. 1 and at rest and in operation, FIG. 3 is a side view of the cam roller retainer and the cam roller, and FIG. 4 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Input shaft, 3... Output member, 6... Torque cam device, 7... Input member, 3b, 7b... Inclined surface,
10... cam roller, 11... cam roller retainer,
llc. lid...notch, 12.13...stopper pin, 1
4...stopper mechanism.

Claims (1)

[Claims] (1) An input member rotatably coupled to a shaft, an output member rotatably arranged on the shaft, a cam roller disposed between inclined surfaces formed on opposing surfaces of the input/output member, and a cam roller. In a torque cam device that includes a cam roller retainer that rotatably holds the cam roller retainer and generates a thrust corresponding to the shaft torque in an output member, a stopper mechanism is provided for each of the input and output members to restrict the rotation range of the cam roller retainer. A torque cam device characterized by: