JPS6116864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling transmission without backlash.

In industrial society, there are a large number of devices that are rotatably driven, and power from a prime mover (electric motor, internal combustion engine, turbine, etc.) is converted to a predetermined rotational speed or torque via a transmission device such as a reducer or speed increaser. After that, various devices are operated. Transmissions used in this case include mechanical transmissions such as gear transmissions and rolling transmissions. Among them, a rolling transmission is fundamentally different from a gear transmission in its power transmission mechanism, and is characterized by transmitting power through smooth rolling motion. There is no play, or backlash, in rolling transmissions. However, in the rolling transmission device actually used, there is play in the engaging portions of each part, and this will be explained by applying the conventional rolling transmission device shown in FIGS. 1 and 2 to a planetary roller device. Reference numeral 1 denotes a sun roller that is integrated with the input shaft of this device, and a plurality of planetary rollers 2 (three in this figure) are arranged at equal intervals around the sun roller 1. The planetary roller 2 is inscribed in and revolves around an inner roller 3 fixed to a casing 4, and is supported on the axis of a planetary pin 5 via a bearing ₆ . The planet pin 5 on _m2
Both ends are inserted with a slight assembly gap. This allows free movement in the radial direction. In the figure, reference numerals 10, 11 and 12, 13 are bearings that support the sun roller 1 and the carrier 7.

In order to operate the rolling transmission type planetary roller device having such a configuration, a radial pressing force P is applied to the contact portions between the respective rollers, between the sun roller 1 and the planetary roller 2, and between the planetary roller 2 and the inner roller 3. _N
(hereinafter referred to as normal force), and in this conventional example, normal force P _N is applied by press-fitting each roller at the time of assembly.
The planetary roller 2 revolves while rotating, and the carrier 7
Only the revolution speed of the planetary roller 2 is taken out and becomes a speed reduction device. In this conventional example, since there is an assembly gap in the planet element, (1): There is play between the planet pin 5 and the planet roller 2 based on the radial gap of the bearing 6. (2): There is play in the insertion portion between the radial grooves m ₁ and m ₂ of the carrier 7 and the planet pin 5. Among these plays, (1) can be solved by applying a preload (negative clearance) to the bearing 6 by using a rolling bearing, but regarding (2), the radial groove m ₁ of the carrier 7,
Since the purpose of m ₂ is to enable only small movements of the planetary roller 2 in the radial direction, play in the circumferential direction inevitably exists. For this reason, if the sun roller 1 is operated as a driving shaft and the carrier 7 is used as a driven shaft, a phase difference and a rotational fluctuation occur due to load fluctuations, and smooth rotational transmission cannot be achieved. Furthermore, rolling transmissions are suitable for high-speed operation because they produce extremely low vibration and noise, but the generation of centrifugal force due to the mass of the revolving elements that accompanies high-speed operation has been a problem.

The purpose of the present invention is to eliminate the play around the planetary pins, which has been a problem in the past, and to provide a smooth rolling transmission without buckling. A plurality of planetary rollers are provided that are circumscribed to a sun roller fixed to a shaft and inscribed to an inner roller fixed to a casing, and a planetary pin that supports the planetary rollers via a bearing is connected to a second rotating shaft. In a rolling transmission device that is fixed to a carrier and transmits power between a first rotating shaft and a second rotating shaft, a circumferential gap is provided between the inner ring of the bearing and the planetary pin, and the planetary pins are provided with a circumferential gap parallel to each other. A semi-cylindrical shape having a radius slightly smaller than the radius of the bearing inner ring is disposed radially with respect to the axis of the sun roller, and a semi-cylindrical shape having a radius slightly smaller than the radius of the bearing inner ring is provided in the space on both sides of the bearing inner ring and the planet pin cutout surface. It is characterized by the insertion of an actuating piece.

Hereinafter, one embodiment of the bump-free rolling transmission device of the present invention will be described in detail with reference to FIGS. 3 and 4, in which it is applied to a planetary roller device. In the drawings, parts that are the same as those in the prior art are given the same reference numerals to avoid duplication of explanation.

The planetary pin 5 is provided with a notch in the center in the axial direction consisting of two parallel surfaces with a width across flats, and both ends of the planetary pin 5 are fixed to the carrier 7 with pins 14, and the fixing position is at the sun roller 1. Two surfaces of the notch are radial with respect to the axis of the notch. Also,
The outer periphery of the planetary pin 5 is inserted into an inner ring 6b of a rolling bearing 6 that supports the planetary roller 2. In this insertion part, the radius of the notch of the center width across flats of the planetary pin 5 is
Since R ₁ is smaller than the radius R ₂ of the inner ring 6b of the bearing 6, a gap C is formed. Inner ring 6b of the bearing 6
A large number of rolling elements 6a are arranged on the outer periphery of the planetary roller 2, and together with the inner periphery of the planetary roller 2, a rolling bearing is formed. Further, the center width across flat notch of the planetary pin 5 is formed by the bearing inner ring 6.
Semi-cylindrical actuating pieces 16a and 16b are provided in the space between b and b.
are inserted on both sides, and the two actuating pieces 16a, 16b
The cross-section of the width across flats is approximately circular. The radius r of this actuating piece is the radius R ₂ of the bearing inner ring 6b.
It is slightly smaller than the previous model, and has a minute assembly gap. In the planetary roller device configured as described above, the movement of the planetary roller 2 in the radial direction can be freely determined within the range of the clearance C (this amount can be freely set in relation to the radii R ₁ and R ₂ ). I can do it. Furthermore, when this device is operated under load with the sun roller 1 as the driving shaft and the carrier 7 as the driven shaft, and the rotation direction being in the direction of the arrow n in FIG. It always tries to move outward. In this case, the actuating piece 16a located at the front in the rotational direction is crimped onto the inner ring 6b of the bearing 6, and the actuating piece 16b at the rear in the rotational direction due to the small assembly gap mentioned above between the inner ring 6b of the bearing 6 and the inner ring 6b of the bearing 6. Freedom of movement. However, as described above, the actuating piece 16b moves outward due to the centrifugal force caused by the revolution, so that the assembly gap disappears. This effect holds true even when the direction of rotation is reversed. Therefore, even if there is an assembly gap when the machine is stationary, the assembly gap disappears when it is in operation, resulting in a rolling transmission with no bumps and transmitting smooth rotation without uneven rotation even when there are load fluctuations. I can do it. Furthermore, even if the assembly gap is made larger than in the past, the gap disappears during operation and there is no backlash, so there is no need to improve machining accuracy and the product can be manufactured at low cost. Furthermore, since the planetary pins are fixed to the carrier, the centrifugal force due to the weight of the planetary pins does not act on the pressure contact surfaces of each roller, making it possible to significantly reduce the centrifugal force and enabling higher-speed operation.

[Brief explanation of the drawing]

Figures 1 and 2 show the case where a conventional rolling transmission is applied to a planetary roller device, where Figure 1 is a longitudinal cross-sectional view, Figure 2 is a cross-sectional view taken along the line X--X in Figure 1, and Figure 3 4 shows a case where the rolling transmission device of the present invention is applied to a planetary roller device, FIG. 3 is a longitudinal sectional view thereof, and FIG. 4 is a sectional view taken along the line Y--Y in FIG. 3. In the drawing, 1 is a sun roller, 2 is a planetary roller, and 3 is a sun roller.
is the inner roller, 4 is the casing, 5 is the planet pin, 6
is the bearing, 6a is its rolling element, 6b is its inner ring, 7
is the carrier, 8 is the cover, 9 is the bolt, 10,1
1, 12, 13 are bearings, 16a, 16b are operating pieces, C is a gap, m ₁ , m ₂ are radial grooves, R ₁ , R ₂ ,
r is the radius.

Claims (1)

[Claims] 1. A plurality of planetary rollers are provided which are circumscribed to a sun roller fixed to a first rotating shaft and inscribed to an inner roller fixed to a casing, and a planetary pin that supports the planetary rollers via a bearing is connected to a second rotating shaft. In a rolling transmission device that is fixed to a carrier connected to a carrier and transmits power between a first rotating shaft and a second rotating shaft, a circumferential clearance is provided between an inner ring of the bearing and the planet pin, and a circumferential gap is provided between the inner ring of the bearing and the planet pin. Notched surfaces provided parallel to each other on the pin are arranged radially with respect to the axis of the sun roller, and a space with a radius slightly smaller than the radius of the bearing inner ring is provided in the space on both sides of the bearing inner ring and the notched surface of the planetary pin. A rolling transmission device characterized by inserting a semi-cylindrical actuating piece.