JPS6184455A - Planetary roller type power transmission device - Google Patents

Abstract

PURPOSE:To improve responsibility between two rotary shafts by disposing a plurality of movable members in an arched space formed by a notch surface of a planetary pin and the inner surface of a bearing inner race through an elastic member in such a manner that the respective movable members are mutually separated from each other. CONSTITUTION:One end of a planetary pin 10 is pressed in a carrier 4 closely. The outside diameter of a portion of the planetary pin 10 that is inserted in a bearing 11 is made a little smaller than the inside diameter of an inner face 11a of the bearing 11 to form space (c), and portions confronting with each other, with the axis clamped therebetween, are notched to form parallel surfaces 10a, 10b extended in the radial direction with respect to the axis of a sun roller 2. Two needle-shaped movable members 18 are assembled in an arched space 17 formed by the surface 10a and the inner surface of the inner race 11a, and two needle-shaped movable members 21 are assembled with an elastic member 20 clamped therebetween in an arched space 19 formed by the surface 10b and the inner surface of the inner race 11. Thus, backlash between two rotary shafts 1, 3 is removed to improve responsibility between both shafts.

Description

[Detailed description of the invention] (Field of use for sedentary work) The present invention relates to a planetary roller type power transmission device.

(Prior Art) An example of a conventional planetary roller type power transmission device is shown in FIGS. The solar roller formed on the body, (3) is the first
A second rotating shaft coaxially arranged with the rotating shaft (1), (4) a carrier formed integrally with the second rotating shaft, (5) a casing, and (6) a bolt attached to the casing (5). (7) is the cover fastened, (8) is the inner roller fixed to the inner surface of the casing (5), (9) is the planetary pin (1 [bearing αυ
A plurality of planetary rollers (three in the figure) are arranged at predetermined intervals in the local direction, and are attached to the outer surface of the sun row 2 (1) and the inner surface of the inner opening 2 (8), respectively. It comes into contact with and rolls. The planet pin a0 is inserted into the radially extending grooves 2 provided on the carrier (4) with a small assembly gap, and the planet roller (9) is moved freely in the radial direction. This allows the device to operate smoothly even with manufacturing errors in parts.

(IJ, α4. Kasumi, Sumi e are bearings.

In such a two-type planetary roller power transmission device, there is a gap between the sun roller (2) and the planetary roller (9) and between the planetary roller (9)
) and the inner roller (8), and by rotating the first rotating shaft (1), the planetary roller (9) revolves while rotating, and the carrier ( 4), only the revolution number of the planetary roller (9) is controlled by the second
The device consists of a rotating shaft (3). Conversely, when the second rotating shaft (3) is driven to rotate, the speed is increased and power is extracted from the first rotating shaft (1).

(Problems to be Solved by the Invention) In the conventional device described above, the planetary pin C1O and the planetary roller (9) are
You can play between them. This play can be eliminated by using a rolling bearing for the bearing αυ and providing a preload, that is, a negative clearance.
A circumferential gap between G and G is unavoidable to allow radial movement of the planet (9).

Therefore, between the WJ1 rotating shaft (1) and the second rotating shaft (3), a phase difference and rotational fluctuation based on the play in the circumferential direction occur due to load fluctuation, and smooth rotational transmission, that is, the first Responsiveness between the rotating shaft and the second rotating shaft cannot be realized.

(Means for Solving the Problems) In order to solve the above problems, the present invention eliminates the play of the planetary pins in the circumferential direction with respect to the axis of the sun roller, and the planetary row 2 type shifter is free from backlash. The gist is that a plurality of planetary rollers, which are circumscribed by a sun roller connected to a first rotating shaft and inscribed by an inner roller fixed to a casing, are equipped with bearings. the planet pin is fixed to a carrier connected to a second rotating shaft, and a radial gap is formed between the inner surface of the inner ring of the bearing and the outer circumferential surface of the planet pin, and A planet pin is cut out to form a surface extending radially with respect to the axis of the sun roller, and a plurality of movable members are disposed within an arcuate space defined by this surface and the inner surface of the inner ring of the bearing. , a planetary roller type power transmission device characterized in that an elastic member is interposed between these movable members to urge them apart from each other.

Embodiment A first embodiment of the invention is shown in FIGS. 1-3. One end of the planet pin (11) is press-fitted into the carrier (4) without any gaps and fixed. This planet pin uI.

The outer diameter of the part inserted into the bearing αυ is the inner ring of the bearing αυ (
A gap (C1) is formed with a slightly smaller diameter than the inner diameter of the sun roller (11α), and the opposing portions are cut out to narrow the axis and are parallel to each other (10α), extending in the radial direction with respect to the axis of the sun roller. By forming the plane (10b), it is assumed to be a 'biplane (10C).Then, the plane (10α
) and the inner surface of the inner ring (11α), two needle-like movable members α& are incorporated in the first arcuate space αη, which is defined by the surface (
In the second arcuate space 11 defined by the inner ring IOb) and the inner surface of the inner ring (llα), two needle-like movable members 011 are installed, sandwiching an elastic member such as a wave spring shown in FIG. Note that the needle-like movable member (18+ is the illustrated implementation fy
For lJ, two are installed, or if the residual surface pressure during power transmission is ensured, only one may be installed. The rest of the structure is similar to that shown in FIGS. 7 and 8 9, and corresponding members are given the same reference numerals.

Therefore, a gap (C) in the radial direction of the device is formed between the outer surface of the two surfaces (10C) of the planetary pin l1lJ and the inner surface of the inner ring (11α) of the bearing (lυ).
The planetary rollers (9) can move radially within the range of , thus allowing smooth operation of the device even in the presence of manufacturing tolerances of the parts. In the circumferential direction of the device, that is, in the power transmission direction, the 92 needle-like movable members C11l are pushed in the direction away from each other by the elastic force Y of the elastic member ) and the inner ring of the bearing aυ (llα)
It is possible to completely eliminate the gap in the circumferential direction of the device between the first rotating shaft (1> and the second rotating shaft (3).
), it is possible to eliminate backlash between the two and achieve good responsiveness between the two.

4 to 6 show a second embodiment of the present invention, in which the surface (10α) of the two surfaces (10C) of the planetary pin (10) and the inner surface of the inner ring (11α) of the bearing (11) One arcuate movable member ■ is incorporated in the first arcuate space αη, which is limited by The structure is different from the first embodiment in that two fan-shaped movable members (to) are inserted between the wings, but the functions and effects are the same. (It may be formed as one unit with 11, or instead of the arcuate movable member, two fan-shaped movable members holding the elastic member (2) may be incorporated in the first arcuate space (17).

(Operations and Effects of the Invention) Although the embodiments have been specifically described above, in the present invention, the planet pins are fixed to the carrier, and the axis of the sun roller is disposed between the inner surface of the inner ring of the bearing and the outer peripheral surface of the planet pins. By forming a radial gap with respect to the radial gap, the planetary rollers can move radially within this radial gap, thus allowing smooth operation of the device despite manufacturing tolerances of the parts. Further, in the present invention, the planetary pin is cut out to form a surface extending radially with respect to the axis of the sun roller, and a plurality of movable members are arranged in an arcuate space defined by this surface and the inner surface of the inner ring of the bearing. , and an elastic member is interposed between these movable members to urge them apart from each other, so this elastic member pushes the mantissa movable members away from each other. This makes it possible to press the planetary pin against the inner surface of the inner ring of the bearing and completely eliminate the gap in the circumferential direction. As a result, bank lash between the first rotating shaft and the second rotating shaft can be eliminated, and good responsiveness between the two can be achieved.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a partially omitted longitudinal sectional view, and FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1. 3 are external perspective views of the elastic member. 4 to 6 show a second embodiment of the present invention, and FIG. 4 is an enlarged sectional view corresponding to FIG. 2, and FIGS. ), Planetary low 2... (9), Bearing... aυ. Inner ring...(11α), planetary pin...αtun second rotating shaft...(3). Carrier...(4), radial gap...(C) 2 sides...(ioh). Arcuate space... α-shaped movable member... (211, E, elastic member... ■ Sub-agents: 3 patent attorneys and non-Kaihon important cultural figures Figure 1

Claims (1)

[Claims] A plurality of planetary rollers circumscribed to a sun roller connected to a first rotating shaft and inscribed to an inner roller fixed to a casing are supported on a planetary pin via bearings, and the planetary pin is connected to a second rotating shaft. A radial gap is formed between the inner surface of the inner ring of the bearing and the outer peripheral surface of the planet pin, and the planet pin is cut out to form a radial gap with respect to the axis of the sun roller. A plurality of movable members are arranged in an arcuate space defined by the surface and the inner surface of the inner ring of the bearing, and a plurality of movable members are arranged between the movable members so as to separate them from each other. 1. A planetary roller type power transmission device characterized by interposing an elastic member that urges the.