JPH0611428Y2 - Compound 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 speed reducer has been proposed which is small in size, has a large reduction ratio, and does not cause play at the time of forward / reverse rotation conversion.

This gearless transmission has an eccentric circular groove and a sinusoidal wave groove consisting of a certain integer number of n waves formed on the opposing surfaces of the drive and driven side rotary plates, and both rotations are made at the intersection of both grooves. Power is transmitted by engaging a ball inserted in a radial window provided in a fixed plate arranged between the plates with both cam grooves. The reduction ratio is such that the driven side rotating plate has a sine wave of 1 rotation for one rotation of the driving side rotating plate.
Since it rotates by a period, it is always determined as 1 / n by the wave number n of the sine wave, and cannot be freely set over a wide range.

Further, since the wave number of the sine wave that can be formed on the output side rotary plate is physically limited, there is a limit in setting the gear ratio depending on the diameter of the rotary plate. Further, if the diameter of the rotating plate is increased in order to obtain a large gear ratio, there is a problem that the entire device inevitably becomes large. For this reason, it has been difficult to use in a structure that requires a small reduction ratio and a large reduction ratio, such as a reclining mechanism of a power seat for an automobile.

<Problems to be Solved by the Invention> Therefore, an object of the present invention is to provide a gearless transmission that is small in size and can set a large gear ratio relatively freely by improving the conventional technique. .

[Means for Solving the Problem] <Means for Solving the Problems> According to the present invention, the above-described object is to provide a first rotating body that is rotatably supported so as to face a fixed plate, and to face the first rotating body. And a second rotating body which is concentrically and rotatably supported,
A sine wave-shaped first cam groove having a plurality of different wave numbers with the same amplitude, which are formed respectively on surfaces of the first rotating body and the fixed plate that face each other along a circle concentric with the center of rotation, and a first cam groove. 2 cam grooves and a sine wave shape having a plurality of different wave numbers with the same amplitude, which are formed along certain circles concentric with the rotation center on the surfaces of the first rotating body and the second rotating body that face each other. 3rd cam groove and 4th
Between the cam groove and the facing surfaces of the first and second rotating bodies,
Alternatively, a first intermediate rotary plate and a second intermediate rotary plate, which are rotatably supported concentrically with the respective rotary bodies between the facing surfaces of the first rotary body and the fixed plate, and integrally coupled to each other. Plate, a plurality of first slits and second slits formed in the first and second intermediate rotary plates so as to extend in a radial direction from the rotation center, respectively, and both ends of the first cam groove and the first cam groove. The first cam is engaged with the second cam groove or the third cam groove and the fourth cam groove so as to be movable in the radial direction in the first slit or the second slit.
This is achieved by providing a compound gearless transmission characterized by comprising a rolling member and a second rolling member.

<Operation> By doing so, the ratio of the wave numbers of the sine waves forming the first cam groove and the second cam groove and the wave number ratio of the sine waves forming the third cam groove and the fourth cam groove can be calculated. The gear ratio can be set by appropriately combining them.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, in a gearless transmission according to the present invention, the same disc-shaped first and second input rotary plates 2 and 3 are fixed to an input shaft 1 rotatably supported so as to be axially separated from each other. An output rotary plate 5 is fixed to the end of the output shaft 4 that is rotatably supported concentrically with the input shaft 1 so as to face the second input rotary plate 3. A fixed plate 6 is disposed between the first input rotary plate 2 and the second input rotary plate 3 with the input shaft 1 penetrating therethrough.

A first intermediate rotary plate 7 is arranged between the first input rotary plate 2 and the fixed plate 6, and a second intermediate rotary 8 is arranged between the second input rotary plate 3 and the output rotary plate 5. The first and second intermediate rotating plates 7 and 8 are integrally connected by a connecting portion 9 and are mounted between the input shaft 1 and the fixed plate 6 and bearings 10 and 1, respectively.
1 is rotatably supported coaxially with the input shaft 1.

The surface 12 of the first input rotary plate 2 facing the fixed plate 6 has a radius a1 about the rotation axis 13 of the input shaft 1 and the output shaft 4.
A first cam groove 14 having a constant width d1 is formed in a sine wave shape having an amplitude ni and an integer ni1 waves of 2 or more at a constant pitch in the circumferential direction along the circle. On the surface 15 of the fixed plate 6 facing the first input plate 2, two or more integers no1 different from the amplitude b1 and ni1 at a constant pitch in the circumferential direction along the circle of radius a1 are provided.
A second cam groove 16 having a constant width d1 in the shape of a sine wave composed of individual waves
Are formed. Similarly, on the surface 17 of the second input rotary plate 3 facing the output rotary plate 5, the amplitude b2 is constant at a constant pitch in the circumferential direction along a circle having a radius a2 centered on the rotation axis 13.
A constant width d2 in the form of a sine wave consisting of two or more integer ni2 waves
The third cam groove 18 of the output rotary plate 5 is formed.
On the surface 19 facing the input plate 3, a second sinusoidal wave having a constant width d2 is formed of two or more integer no2 waves different in amplitude b2 and ni2 at a constant pitch in the circumferential direction along the circle having the radius a2. A cam groove 20 is formed.

The first and second intermediate rotary plates 7 and 8 are formed with a plurality of first slits 21 and second slits 22 extending in a radial direction about the rotation axis 13 at equal angles. In each of the slits 21 and 22, drive pins 23 and 24 having a diameter substantially equal to the width of the slits are arranged in parallel with the rotation axis line 13, and both ends thereof have corresponding first and second cam grooves 14, respectively.
16 or the third and fourth cam grooves 18 and 20 are fitted and inserted so as to be movable in the radial direction.

Next, the operation of the above gearless transmission will be described.

When the input shaft 1 is rotated, the first drive pin 23 that engages with the first cam groove 14 as the first input rotary plate 2 rotates becomes the first drive pin 23.
It moves in the slit 21 in the radial direction. Second cam groove 16
Is fixed, the first intermediate rotary plate 7 having the first slit 21 rotates in the opposite direction to the first input rotary plate 2 by the movement of the first drive pin 23. At the same time, as the second input rotary plate 3 rotates, the second drive pin 24 engaging with the third cam groove 18 moves in the second slit 22 in the radial direction.
Since the second intermediate rotary plate 8 rotates integrally with the first intermediate rotary plate 7, the output rotary plate 5 rotates in the opposite direction with respect to the second intermediate rotary plate 8.

2 to 4, the rotation center of each rotary plate corresponding to the rotation axis 13 is set to 0, and each cam groove 14, 16, 1
The center lines of 8 and 20 have the same reference numerals 14, 16 and 1 respectively.
It is represented by 8, 20. In FIG. 2, the first and second cam grooves 1
The tops of 4 and 16 intersect in the first slit 21 and the first drive pin 23 is located at the intersection position A. FIG. 3 shows a state in which the first input rotary plate 2 is rotated with reference to the positional relationship shown in FIG.

The rotation angle of the first input rotary plate 2 is set to θi in the clockwise direction from the reference line connecting the points O and A, and the rotation angle of the first intermediate rotary plate 7 is set to the angle θs in the counterclockwise direction. The intersecting position of both cam grooves 14 and 16 is rotated counterclockwise by an angle θs from the reference position A together with the first drive pin 23, and is moved downward in the first slit 21 to the position A ′. Center line 1 of each cam groove from point O
If the distances to 4 and 16 are Ri1 and RO1, respectively, Ri1 = a1 + b1sin {ni1. (Θi + θs)} Ro1 = a1 + b1sin (no1 · θs), and Ri1 = Ro1 at the intersection A ′. sin {ni1 · (θi + θs)} = sin (no1 · θs) That is, ni1 · (θi + θs) = no1 · θs. Therefore, the rotation angle of the first intermediate rotary plate 7 becomes θs = θi · ni1 / (no1-ni1) ... (1), and the gear ratio between the first input rotary plate 2 and the first intermediate rotary plate 7 is i1 = Θs / θi = ni1 / (no1-ni1)

FIG. 4 shows the positional relationship between the second input rotary plate 3 and the output rotary plate 5 which rotate with the rotation of the first input rotary plate 2 described above, and the second intermediate rotary plate 8 arranged between them. It is shown. The rotation angle of the second input rotary plate 3 is θ1 and the rotation angle of the output rotary plate 5 is θ2 clockwise from the second slit 22 with the point O as the center. The intersecting position of the third and fourth cam grooves 18, 20 is rotated with the second drive pin 24 from the reference position A by an angle θs in the counterclockwise direction, and is moved downward in the second slit 24 to the position A ″. Similarly, if the distances from the point O to the cam groove center lines 18 and 20 are Ri2 and Ro2, respectively, Ri2 = a2 + b2sin (ni2.theta.1) RO2 = a2 + b2sin (no2.theta.2) and at the intersection position A '. Since Ri2 = Ro2, sin (ni2.theta.1) = sin (no2.theta.2) That is, ni2.theta.1 = no2.theta.2 (2) where θ1 = θi + θs, θ2 = θo + θs ... ( 3) Therefore, the final gear ratio i = θo / θi is
Substituting equations (1) and (2) into (3) yields i = (no1 ・ ni2-ni1 ・ no2) / no2 (no1-ni1).

Here, for example, the wave number of each cam groove is ni1 = 15, n
If i2 = 13, no1 = 67, no2 = 58, i = 1/3
Since it is 016, a very high reduction ratio can be obtained.

Further, since the number Ns1 of the first slits 21 intersects at the positions of the slits 21 where the first cam groove 14 and the second cam groove 16 are arranged at equal intervals, the following relational expression a1 + b1sin (n01.
2π / Ns1) = a1 + b1sin (ni1 · 2π / Ns1) is satisfied. Therefore, n01 · 2π / Ns1) = ni1 · 2π / Ns1 + A1 · 2π (A1 = natural number), and Ns1 = (n01-ni1) / A1. Here, if A1 = 4, Ns1 = 13.

The number Ns2 of the second slits 22 is similarly obtained by Ns2 = (no2-ni2) / A2. Here, if A2 = 5, then Ns2 = 9.

In this embodiment, the output shaft 4 rotates in the same direction as the input shaft 1. However, by appropriately setting the wave number of the sine wave forming each cam groove, the gear ratio becomes a negative value, and the output shaft 4 becomes It rotates in the opposite direction to the input shaft 1.

[Advantages of the Invention] As described above, according to the present invention, the first intermediate rotary plate having the radial slit is disposed between the first input rotary plate and the fixed plate each having the sinusoidal cam groove. And a second intermediate rotary plate having a radial slit integrally connected with the first intermediate rotary plate is arranged between the second input rotary plate and the output rotary plate similarly having a sinusoidal cam groove. At the same time, the drive pin is engaged with the cam groove via each slit to transmit power, so by combining the wave numbers of the sine waves forming each cam groove appropriately, it is easy without increasing the size of the entire device. It is possible to freely set a large gear ratio.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a gearless transmission ratio according to the present invention. 2 to 4 are views for explaining the operation of the embodiment shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Input shaft, 2 ... 1st input rotary plate 3 ... 2nd input rotary plate, 4 ... Output shaft 5 ... Output rotary plate, 6 ... Fixed plate 7 ... 1st intermediate rotary plate, 8 ... 2nd intermediate rotary plate 9 ... connecting portion, 10, 11 ... bearing 12 ... facing surface, 13 ... rotating axis 14 ... first cam groove, 15 ... facing surface 16 ... second cam groove, 17 ... facing surface 18 ... third cam groove, 19 ... Opposed surface 20 ... Fourth cam groove, 21 ... First slit 22 ... Second slit, 23 ... First drive pin 24 ... Second drive pin

Claims (1)

[Scope of utility model registration request] 1. A first rotating body rotatably supported facing a fixed plate, and a second rotating body facing the first rotating body and rotatably supported concentrically. A sine wave-shaped first cam groove having a plurality of different wave numbers with the same amplitude, which are formed respectively on surfaces of the first rotating body and the fixed plate that face each other along a circle concentric with the center of rotation, and a first cam groove. 2 cam grooves, and a sine wave shape having a plurality of different wave numbers with the same amplitude, which are formed along certain circles concentric with the rotation center on surfaces of the first rotating body and the second rotating body that face each other. Concentric with each of the third cam groove and the fourth cam groove and between the facing surfaces of the first and second rotating bodies, or between the facing surfaces of the first rotating body and the fixed plate, respectively. First rotatably supported in a circular shape and integrally connected to each other Intermediate rotary plate and a second intermediate rotary plate, and a plurality of first slits and second slits formed in the first and second intermediate rotary plates so as to extend in a radial direction from the rotation center, respectively, The first rolling is engaged with the first cam groove and the second cam groove, or the third cam groove and the fourth cam groove so as to be radially movable in the first slit or the second slit. A composite gearless transmission, comprising: a member and a second rolling member.