JPH0611430Y2 - Gearless transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of Invention] <Industrial field of application> The present invention relates to a gearless transmission capable of relatively freely setting a gear ratio over a wide range.

<Prior Art> Conventionally, for example, in Japanese Patent Laid-Open No. 60-146954, a so-called gearless transmission has been proposed which is small in size, has a large reduction ratio, and does not cause play during forward / reverse rotation conversion. . In this gearless transmission, an eccentric circular groove and a sinusoidal groove composed of a plurality of waves are formed on the respective facing surfaces of the driving side and driven side rotating plates, and the radial direction provided on the fixed plate sandwiched between the rotating plates. By engaging the driving member inserted in the window of the above with both grooves at their intersecting positions, the driving force is transmitted at a reduction ratio determined by the wave number of the sine wave.

As a driving member, as shown in FIG.
The fixing plate 35 is engaged with the respective cam grooves 33 and 34 of Nos. 1 and 32.
A sphere 37 arranged in the slit 36 of is used. Further, in another embodiment of the prior art, as shown in FIG. 4, a cylindrical roller 38 having both ends fitted and engaged in the cam grooves 33, 34 is used instead of the sphere.

However, the driving member including the spherical or cylindrical roller moves in the slit with the movement of the cam groove, although the central portion is in contact with the inner wall of the slit and both end portions are engaged with the corresponding cam grooves. At this time, the respective parts tend to rotate in different directions by the action of the force received from the inner wall of the slit and the respective cam grooves. For this reason, slippage occurs between the drive member and the slits and the cam groove, and this sliding friction limits the smooth movement of the drive member, resulting in a decrease in the transmission efficiency of the drive force.

<Problems to be Solved by the Invention> Therefore, an object of the present invention is to eliminate the slippage between the driving member and the cam groove during use to ensure smooth movement of the driving member and to improve the driving force transmission efficiency. It is to provide a gearless transmission that can improve the.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, the above object is to provide a first plate and a second plate that face each other with an intermediate plate interposed therebetween, and the second plate of the first plate. A first cam groove formed on a surface facing the plate, a second cam groove formed on a surface facing the first plate of the second plate so as to face the first cam groove, and the intermediate plate A plurality of slits formed in the radial direction corresponding to the first cam groove and the second cam groove, and radial directions in the slits with both ends fitted in the first cam groove and the second cam groove, respectively. And a drive member movably inserted into the gearless transmission, wherein any one of the first plate, the second plate or the intermediate plate is fixed and the other two are rotatably supported. And the first and second rolling elements capable of rolling in the first and second cam grooves are respectively the drive unit. It is achieved by providing a gearless transmission which is characterized in that at both ends of which are relatively rotatably mounted.

<Operation> With this configuration, the driving member can move in the slit while rolling contact is made by the cam grooves and the rolling elements at both ends thereof.

<Embodiment> Referring to FIG. 1, a gearless transmission according to the present invention comprises a disc-shaped input rotary plate 2 fixed to an end of an input shaft 1 rotatably supported, and an input shaft 1. An output rotary plate 4 fixed to face the input rotary plate 2 is provided at an end of an output shaft 3 which is rotatably supported coaxially. A fixed plate 5 is arranged between the rotary plates 2 and 4.

On the facing surface 6 of the input rotary plate 2, a sinusoidal wave composed of a plurality of waves is formed at a constant pitch in the circumferential direction along a circle centered on the common rotation axis 7 of the input shaft 1 and the output shaft 3. A first cam groove 8 having a constant width is formed. Similarly, on the surface 9 of the output rotary plate 4 facing the input rotary plate 2, a plurality of waves different from the first cam groove 8 at a constant pitch in the circumferential direction along the circle centered on the rotation axis 7 are formed. The second cam groove 10 having the same width is formed in a sinusoidal shape. A plurality of slits 11 corresponding to the first cam groove 8 and the second cam groove 10 are formed in the fixed plate 5 at equal angles in the radial direction around the rotation axis 7. A drive member 12 is held in each slit 11 such that both ends thereof are fitted into the cam grooves 8 and 10 at the intersections of the cam grooves 8 and 10, respectively, and are movable along the slit 11.

As best shown in FIG. 2, the drive member 12 includes two shaft members 13 and 14 which are bilaterally symmetrical along the axial direction. Each of the shaft members 13 and 14 has a large diameter portion 17 and 18 and a small diameter portion 19 and 20, respectively, between thin flanges 15 and 16 which form a pair and extend in the radial direction. The shaft members 13 and 14 are integrally formed by abutting the large diameter portions 17 and 18 back to back so as to sandwich the fixing plate 5 from both sides by the flanges 15 and 16 and fitting the large diameter portions 17 and 18 in the ring 21 to form the slit 11. Held in.

The small diameter portions 19 and 20 have a first cam groove 8 and a second cam groove, respectively.
Ball bearings 22 and 23 having an outer diameter suitable for the cam groove 10 are integrally mounted. In the ball bearings 22 and 23, the inner rings 24 and 25 are fitted into the outer circumferences of the small diameter portions 19 and 20 by press fitting, and the outer rings 26 and 27 are rotatably fitted into the cam grooves 8 and 10, respectively.

When the input shaft 1 is rotated, the outer ring 26 of the ball bearing 22 rolls in the first cam groove 8 as the input rotary plate 2 rotates,
The driving member 12 reciprocates along the slit 11. By the movement of the driving member 12, the outer ring 27 of the ball bearing 23 rolls in the second cam groove 10 to drive the output rotary plate 4, and the output shaft 3 rotates in the same direction as the input shaft 1.

At this time, the driving member 12 is driven by a force acting in the circumferential direction from the input rotary plate 2 by the first cam groove 8, and at the same time, a driving force in the circumferential direction is applied to the output rotary plate 4 in the second cam groove 10. The outer rings 26, 2 of both ball bearings 22, 23
7 moves in the cam grooves 8 and 10 while rotating in opposite directions. Therefore, the driving member 12 can move very smoothly by rolling contact with the cam grooves 8 and 10.

Further, the drive member 12 is guided by the flanges 15 and 16 arranged on both sides of the fixed plate 5 to move in the slit 11. Therefore, since the acting directions of the forces received from the cam grooves 8 and 10 are different, the large diameter portions 17 and 18 are
Since the center portion of the drive member 12 including the ring 21 and the ring 21 is not twisted or tilted in the slit 11 during movement, a proper posture substantially parallel to the rotation axis 7 can be maintained, so that smooth movement is always performed. Reserved.

[Advantages of the Invention] As described above, according to the present invention, the driving member is fitted in each cam groove, and the relatively rotatable rolling elements are attached to both ends of the driving member, so that the driving member is constantly in rolling contact with the cam groove. Since it moves in the slit, smooth movement of the driving member is ensured, and the driving force transmission efficiency is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a gearless transmission to which the present invention is applied. FIG. 2 is a partially enlarged sectional view showing the driving member. FIG. 3 is a sectional view similar to FIG. 2 showing an embodiment of a conventional drive member. FIG. 4 is a sectional view showing another embodiment of the conventional driving member. DESCRIPTION OF SYMBOLS 1 ... Input shaft, 2 ... Input rotary plate 3 ... Output shaft, 4 ... Output rotary plate 5 ... Fixed plate, 6 ... Opposing surface 7 ... Rotation axis line, 8 ... 1st cam groove 9 ... Opposing surface, 10 ... 2nd Cam groove 11 ... Slit, 12 ... Driving member 13, 14 ... Shaft member, 15, 16 ... Flange 17, 18 ... Large diameter part, 19, 20 ... Small diameter part 21 ... Ring, 22, 23 ... Ball bearing 24, 25 ... Inner ring, 26, 27 ... Outer ring

Claims (2)

[Scope of utility model registration request] 1. A first plate and a second plate facing each other with an intermediate plate interposed therebetween, a first cam groove formed on a surface of the first plate facing the second plate, and a second plate of the second plate. A second cam groove formed on the surface facing the first plate so as to face the first cam groove;
A plurality of slits formed in the intermediate plate in a radial direction corresponding to the first cam groove and the second cam groove, and inside the slit while both ends are fitted into the first cam groove and the second cam groove, respectively. And a drive member that is movably inserted in the radial direction, wherein one of the first plate, the second plate, or the intermediate plate is fixed and the other two are rotatably supported, respectively. A machine without gears, characterized in that first and second rolling elements that can roll in the first and second cam grooves are mounted on both ends of the drive member so as to be relatively rotatable. transmission. 2. The gearless transmission according to claim 1, wherein the driving member has a pair of flanges arranged on both sides of the intermediate plate so as to sandwich the intermediate plate.