JPS59133863A - Reduction gear - Google Patents

Abstract

PURPOSE:To provide a reduction gear with high transmitted power in small size by arranging No.1 and No.2 discs, furnished with a wavy groove, oppositely with rolling bodies held by a retainer interposed. CONSTITUTION:Between two discs 11 and 12, a retainer 14 is interposed to hold rolling bodies 13, wherein the two discs 11, 12 and retainer 14 shall work as input, stationary and output side, respectively. The rolling body 13 is held in a long hole 20 of the retainer 14 at its part where a wavy groove 18 in the disc 12 intersects with a wavy groove 19 in the disc 11. If the numbers of crests of these wavy grooves 18, 19 are represented by Z2, Z1, respectively, the number of rolling bodies N is expressed as N=Z1+Z2.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This description concerns the deceleration j'MVC.

[Prior art and its problems]

A conventional speed reducer is shown in Figure 1K) (1)). This speed reducer is a gear type. Gear 1 is the input side, and gear 2 is the output side. Assuming that the number of gears 10 is Zl, the pitch circle diameter is , and the number of teeth of gear 2 is Z2, and the pitch circle diameter is D2, the reduction ratio U of this reducer is given by the following formula.

2D2 Z, , D.

In order to increase the reduction ratio, it is necessary to reduce the pitch circle diameter of gear 1 or increase the pitch circle diameter of gear 2. However, since the gear needs to have about 14 or more teeth, there is a limit to reducing the size of the gear 1. Therefore, the size of the gear 2 cannot be reduced either. Therefore, it becomes a large speed reducer.

Also, power is transmitted between gear 1 and gear 2, but the ones that directly transmit power are the teeth of gears 1 and 2.
each has one or two teeth in contact with each other,
Its teeth do not transmit power at all. Therefore,
In order to transmit the necessary power, the individual teeth are large and the size of gears 1 and 2 is large.

As explained above, the gear type speed reducer has the disadvantage that it occupies a large volume in spite of the transmitted power.

[Objective of the Invention J] The present invention is to provide a small-sized speed reducer with high power transmission, which improves the disadvantage of the conventional gear reduction type transmission power, which occupies a large volume.

[Summary of the invention]

The present invention is a first method in which grooves are formed in a wavy manner along the rice field on the surface.
．． The speed reducer includes a second disc, a retainer that opposes the first disc and the second disc via a rolling element, and holds the rolling element.

〔Effect of the invention〕

The effects obtained by this invention are as follows: Since all the rolling elements transmit power, a small speed reducer is possible. Further, since the reduction ratio is determined by the aK of the wavy waves provided on the disk, a rather large reduction ratio is required. Therefore, the present invention provides a small size, a high speed ratio, and a high transmission power.

[Embodiments of the invention]

Embodiments of the present invention are shown in FIGS. 2, 3, 4, and 5.

In FIG. 2, there is a rolling element 13 between the discs 11 and 12, and a cage 14 for holding the rolling element 13.

The disc 11 is supported by a case 16 by a bearing 5. Further, the retainer 14 is supported by the disc 12 by a bearing 17.

A wavy groove 18 provided on the disk 12 is shown in FIG.
The wavy groove 19 provided on the disk ll is shown in FIG.

The retainer 14 shown in FIG. 5 also has an elongated hole 20.

The rounded rolling element 13 is formed by the wavy grooves 18 of the disc 12 and the disc 11.
It exists at the intersection with the zero-wavy groove 19. Disk 11
is the input side, the disc 12 is the identification side, and the retainer 14 is the output side.

Next, the principle of this embodiment will be explained with reference to FIG. The center line of the wavy grooves 18 and 19 in Figures 3 and 4 is a sine curve 21.
, 22, and the pitch circle 2 of this sine curve 21.22
Maximum of 3] Let B be the width of the dragonfly. With the sine curve 21 on the fixed side, when the sine curve 22 is rotated by θ, the angle of the intersection 24 of the sine curves 21 and 22 is θB.

(The rolling element 13 in Fig. 2 exists at the intersection 24) θB=
.

At this time, since the angle of the intersection 24 is θB-0, the reduction ratio U is expressed by the following formula.

If the number of peaks of the sine curve 21 is Z2, the number of peaks of the sine curve 22 is Zl, and the amplitude of the intersection point is X, then x = 13
CφS Z2 θ13 (uniform x = B CφSZ, (θ
-θB)(C).

When formulas (5) to (C) described above are rearranged, the reduction ratio is as follows.

Also, the number N of rolling elements is N=Z, +Z, , same).

7 in Figures 2, 3, 4, and 5. =3゜Z2=
6, the reduction ratio is u = 3, and the number of rolling elements 13 is N.
-9 Also, the number of elongated holes in the retainer 14 in Fig. 5 is 9.
become. In addition, the length of the elongated hole 20 of the cage 14 in Fig. 5 is equal to or greater than the maximum amplitude W of the sine curve plus the tα diameter of the rolling element.If you want to increase the reduction ratio (Z4
=1).

As explained above, the present invention allows the reduction ratio to be freely selected depending on the number of wavy grooves. In addition, when the reduction ratio is increased, the number of rolling elements can be increased, and a large amount of transmitted power can be ensured. Therefore, the present invention can provide a reduction gear that is small in size, has a large reduction ratio, and has a canine transmission power.

In this embodiment, the disk is on the input side and the holder is on the output side, but input and output may be combined using any two of the three elements, the two disks and the holder.

For example, a combination of disks and disks for input and output may be used.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a conventional gear type reducer, Figure 2, Figure 3,
4 and 5 are explanatory diagrams showing an embodiment of the present invention, and FIG. 6 is a diagram showing the principle of this embodiment.

Claims (1)

[Claims] First and second disks each having a groove formed in a wave shape along a plane circle, and the first disk and the second disk facing each other via a rolling element, A speed reducer characterized by being equipped with a moving retainer.