JPS5980557A - Planetary device - Google Patents

Abstract

PURPOSE:To dispense with a retainer as well as to reduce a degree of loss torque in a way of miniaturizing a sun roller, by installing a planetary roller interposingly between the sun roller and a conical inscribed ring, while setting up a planetary rolling element which rollingly contacts two planetary rollers abutting each other and other inscribed rings. CONSTITUTION:Inscribed rings 4 and 5 being different in their inner diameter each are set up in an axial direction in parallel, while a planetary roller 3 differs in its diameter at both sides in an axial direction and the interval in between whereby large diametral roller parts 31 and 33 are made contact rollingly with a sun roller 1 and simultaneously contacts rollingly the inscribed ring 4 while a small diametral roller part 32 is as well made contact rollingly with the inner circumferential surface of the inscribed ring 5. A planetary rolling element 2 contacts rollingly two planetary rollers 3 abutting each other and each of inscribed rings 6 and 6. However, the shaft center of the planetary rolling element 2 is situated in position farther outward than a line l connecting each of shaft centers of these planetary rollers 3. Contact load by elasticity in these inscribed rings 4 and 5 themselves is dispersed even into the planetary roller 3 and the planetary rolling element 2 so extensively whereby the load imposed directly on the sun roller 1 is very small, thus the degree of loss torque is as small as negligible.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to planetary devices, particularly planetary devices that transmit power by rolling contact.

A planetary device is usually composed of gears, but in order to reduce the noise, the sun ear, planet 10a, and internal gear wheel are replaced with the sun 0-ra, planet 0-ra, and inscribed ring, respectively. There is something that has been replaced. In this case, the planet 0-la is rotatably supported by a retainer corresponding to one of the planets, and the spacing between the thin and small planets D-la on the axis of the sun D-la is The axes of the planetary roller and the sun are kept parallel to each other.

Here, in the case where the retainer rotatably supports the planetary rollers through full sliding contact, although the structure is a 1-item wheel, there is a drawback that a large torque is generated due to the friction of the sliding contact, and the retainer Planet 0 via rolling bearing
- Although the torque loss is reduced when the metal plate is rotatably supported, the cost is still high. Moreover, in order to transmit the u1 force by rolling contact, contact pressure must be applied between the sun D-la and the planet D-la, and between the planet 0-la and the inscribed link, respectively. but,
The contact load applied from the internal link is concentrated on the sun D through the planetary roller, and if the length of the sun roller is constant, the diameter of the sun D can be made small due to the limit for this load MVc. This means that it is difficult to reduce the zero torque because the diameter of the solar zero directly affects the value of transmission loss.

The present invention has been made in view of these points, and its purpose is to provide retainers. To provide a planetary device which does not require a retainer and therefore eliminates various problems caused by the presence of a retainer, reduces the contact load applied to one sun roller, and reduces the zero stress by reducing the diameter of the sun roller. To explain the present invention, several planetary planets are disposed between a sun roller and an inscribed link coaxial with the sun roller, making rolling contact with both. In addition, it is characterized in that a plurality of planetary rollers are disposed in rolling contact with two adjacent planetary O-la and a sun roller or an internal link, and the sun roller or other internal link is The planetary rolling elements rolling into contact with the two adjacent planets 0-la determine the position and axis direction of the planets 0-la, as well as their own position, and the contact load is distributed to the planetary rolling elements. This is how it was done.

The present invention will be described in detail with reference to the illustrated embodiment. In the illustrated example, a differential output can be taken out. A and 141151161161 each indicate an inscribed link.

Inscribed links +411[+1 have different inner diameters and are arranged in parallel in the axial direction, and the planet O-ra 13
1 has different diameters at both ends in the axial direction and between them, and has a large-diameter 0-ra portion 1111831 and a small-diameter 0-ra portion,
The large diameter 0-La part β old 33) rolls into contact with the sun 0-La 11, and the large diameter 0-La part f311 rolls into contact with the inward surface of the internal link 141.
- The radius portion (2) is in rolling contact with the inner circumferential surface of the internal link 151. In the embodiment shown in FIGS. 1 and 2, the planetary rolling element 21 indicated by needle 0-1 has two adjacent planets 13: and 161 inscribed therein.
Several VCa are arranged so as to be in rolling contact with the inward facing surface of +61. yt connecting the axes of planets 0-131
, so that the axis of the sun 0-la (planetary rolling element 12 is located outward in the radial direction of 11), that is, connect the axis of the planet 0-la (3:) and the planetary rolling element 121. The angle between the line m and the line Ht in FIG. 2 is set to f>0.

Now, in this case, a contact load P is applied due to the elasticity of the internal link +41151 itself, and the planet 0-
La 131 is double contact with thick mo-la Ill 2
Loads of Px and Ps are applied to two planetary rolling elements, 21.21, respectively, and P! = Pa= (P
-Pl) / 2 cos θ, and the planet D-ra +21
K applied load Pz, Ps inscribed link 16116
11c It is in equilibrium by applying the force of P4.

By the way, in the case where there is no planetary rolling element 2), the load P is directly applied to the sun roller 111, so the load P that is directly applied to the sun roller ill is extremely large due to p) pt. It is getting smaller.

Therefore, the diameter of the sun D-la Il+ can be made smaller without changing the length, and the generated D2 tangential force and the sun 0-la,
It is possible to reduce the loss torque caused by the product of 11 and the radius.

Now, if we rotate the sun 0-il+ clockwise, the planet 0-
5131F′i How many rotations to the left, planetary rolling element, 21 g/″i
There is a lubricant at the beginning of clockwise rotation. At this time, if the inner ring (41 is fixed, the inner ring - J ring 16) is the roller part cover 1 +3
21 starts to rotate clockwise due to the difference U1 due to the difference in diameter, and the internal link i611el also rotates clockwise. Note that it is free to decide which of the sun 0-ra 11 and the inscribed link 4) 1 [11161181 to be used as the input part or the output part.

City in the figure) is the sun 0- due to regulation of movement in the thrust direction.
La Ill vcIt higher side $4. f21+ is a planetary rolling element, a flange integrally provided at one end of 21, +22 is a subwheel provided at the other end, (23j is a 0-shaped link. Planetary rolling! I
II body i21 ij, two planets D-ra+31131 and the sun 〇-511) may be brought into rolling contact.

Other embodiments are shown in FIGS. 3 to 5. This is planetary rotation #I
Body, FirJ fk except that 21 is made into a sphere! , real bI
It has roughly the same configuration as Example E. and planetary rolling element 12
) is made into a sphere, an annular concave surface (341I3411jt) is formed on the same edge of the axial end of the planet 0-513), and the inscribed 'Jy 181161 has a race surface, and the sun 0-513) is made into a sphere. A strip 1121 is installed at one end in the axial direction of 5111.
is integrally provided, and a side wheel (131) is fixed in and out at the other end, and an internal link +61 vc is further provided by an elastic member (7)
Thrust money is given. 140) It is a concave groove for the ld oil sump. In this case, since the planetary rotor +21 is also subjected to thrust force by rolling, the loss torque is extremely small. However, in this case, since the internal links +61 +61 are fixed, the planetary rotation 1K +21 of the sphere is determined by the planetary roller (31), so the planetary rolling element 12
1 diameter d1 and the diameter d of the internal link (6) @ (planetary rotation 1
The ratio of the diameter at the contact point ct of the body is 0-5
13) diameter as+, da2 and inscribed yg14
) or inner diameter d4 of internal link +41. It is necessary to keep the ratio equal to the ratio of d, and when using the inscribed y-gage 14) fixedly, ds+/da = ds/da, otherwise slippage will occur. Inscribed link (
As shown in FIGS. 6 and 7, an internal link (bearing +81 with 61 as an inner race) is formed so that it can rotate freely while applying a thrust force to 61 with an elastic member 17). Then, the elastic article 1 material 17) may be welded to the removal base 191.

As described above, in the present invention, even without a retainer, the position and axial direction of the planet O-la are determined by rolling contact between the planet O-la and the planet O-la and the internal link. There are no problems caused by the presence of a retainer, and when the planetary rolling elements make rolling contact with the two planetary rollers and other internal links, the contact load applied to the sun roller is small. Therefore, it is possible to improve the transmission efficiency by reducing the diameter of the solar zero and reducing loss torque.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of one embodiment of the present invention, and Fig. 2 is the same A.
- A sectional view, '@3 figure is a longitudinal sectional view of another embodiment, 4th
The figure is a sectional view taken along the line B-B of the same as above, FIG. 5 is a sectional view taken along the line C-C of the same as above, FIG. FIG. , 11 is the sun 0-la,
121 is a planet rotator, 131 is a planet 0-la, ・41・f
il t+il indicates an inscribed link. Dai Sokujin Benchushi Seki 1) Cho 7 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] ill Between the sun 0-la and the inscribed coaxial with this sun 0-la, the planet 0 that rolls into contact with both.
- In addition to arranging multiple A, two adjacent planets D
-A planetary device characterized by having a plurality of planetary rolling elements arranged in rolling contact with the sun 0-RA or other inscribed ring (!:V). 12) The planetary rolling elements are planetary rollers. 2. The planetary device according to claim 1, wherein the planetary device is in rolling contact with the inscribed ring. 131. The planetary device according to claim 1 or 2, wherein the planetary rolling elements are 0-ra. +41 The planetary device according to claim 1 or 2, wherein the planetary rolling element is a sphere and is in rolling contact with the axial end of the planet ○-ra.