JPS58156758A - Planet roller type transmission gear - Google Patents

Abstract

PURPOSE:To eliminate the play around a plane pin and ensure the smooth non- backlash rolling of the planet roller by a structure wherein the inner race of a bearing supporting the planet roller and the planet pin are joined by a wedge with each other. CONSTITUTION:A wedge mechanism consists of wedge pieces 16a and 16b, the planet pin 5 and a nut 15 so as to assemble without circumferential backlash around the planet pin 5 entirely regardless of the accuracies of parts such as the wedge fillers 16a and 16b and the planet pin 5. Because the radial clearance existing between planet bearings 6a and 6b can also be eliminated by enlarging the clamping force of the nut 15, an individual pre-loading mechanism conventionally used for the elimination of radial clearance becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a planetary roller type rolling transmission without bank lash.

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. The other two various devices are being driven. Mechanical transmissions used in this case include 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 the fact that it transmits 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. 1 is a book.

A sun roller is integrated with the input shaft of the device, and a plurality of planetary rollers 2 (eight in this figure) are arranged at equal intervals around the sun roller 1.
is placed. The planetary roller 2 is inscribed in and revolves around an inner roller 8 fixed to a casing 4, and is supported on the axis of a planetary pin 5 via a bearing 6, and is also supported by a radial groove S provided in a carrier 7. Both ends of the planetary pin 60 are inserted into S2 with a slight assembly clearance. Therefore, the movement of the planetary row 22 in the radial direction is indicated by reference numeral 10. l
l and 12.18 are bearings that support the sun roller l and carrier 7, 8 is a cover, and 9 is a bolt.

In a rolling transmission type planetary roller device with such a configuration, each roller is moved between the rollers in order to operate.

That is, a radial pressing force PN (
In the conventional example, the normal force PN is applied by press-fitting each roller at the time of assembly, so the planetary row 22 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, there is an assembly gap in the planetary element. That is.

(1): There is play between the planetary pin 5 and the planetary roller 2 based on the radial clearance of the bearing 6. (2): There is play in the insertion portion between the radial $81182 of the carrier 7 and the planetary pin 5. Among these plays, (2) can be solved by applying a preload (negative clearance) to the bearing 6 using a rolling seconds bearing, but (2) the purpose of the radial grooves S1 and S2 of the carrier 7 is to Since the roller 2 is only allowed to make small movements in the radial direction, play in the circumferential direction inevitably exists.For this reason, the sun roller 1 is operated as the driving shaft and the carrier 7 is the driven shaft. As a result, phase differences and rotational fluctuations occur due to load fluctuations, making smooth rotation transmission impossible.In addition, rolling transmissions are suitable for high-speed operation because they produce extremely low vibration and noise, but centrifugal transmissions due to the mass of the revolving elements that accompany high-speed operation The problem was power generation.

The object 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 transmission device that can smoothly roll without backlash.

The configuration of the backlash-free rolling transmission device of the present invention includes a plurality of planetary rollers circumscribed to a sun roller fixed to a first rotating shaft and inscribed to an inner roller fixed to a casing. In a rolling transmission device in which a planetary pin supporting the planetary roller is fixed to a carrier connected to a second rotating shaft, and power is transmitted between the first rotating shaft and the second rotating shaft, the inner ring of the bearing and A circumferential gap is provided between the planet pin and an inclined shape 4 provided on both sides of the planet pin. A cutout surface is arranged radially with respect to the axis of the sun roller, and a space on both sides of the bearing inner ring and the inclined cutout surface of the planet pin has a diameter equal to or slightly smaller than the bearing inner ring radius. It is characterized by the insertion of an operating piece with a semi-cylindrical radius.

The following two figures 8 to 5 show an embodiment of the backlash-free rolling transmission device of the present invention applied to a planetary roller device.
This will be explained in detail based on the figures.

In the drawings, parts that are the same as before are designated by the same symbols.

Avoid duplication of explanations.

The planetary pin 5 is provided at its axial end with notches m, m2 consisting of two sides having an inclined width across flats, and the end 5a is press-fitted into the carrier 7, and the fixing position is as follows. The two surfaces of the slanted notch surface +m2 are radially arranged with respect to the axis of the sun roller 1. The outer periphery of the planetary pin 5 is still inserted into the inner ring 6b of the rolling bearing 6 that supports the planetary roller 2. In this insert.

Since the radius R1 of the notch ml+m2 of the inclined width across flats of the planetary pin 5 is smaller than the radius R2 of the inner ring 6b of the bearing 6, a gap C is formed. A large number of rolling elements 6a are arranged on the outer periphery of the inner ring 6b of the bearing 6, and together with the inner periphery of the planetary roller 2, a rolling bearing is formed. Further, the inclined width across flat notches m1 and m2 of the planetary pin 5 are semi-cylindrical inclined entry parts ml and m2 in the space with the bearing inner ring 6b, and have a cylindrical cross section. The radius r of this actuating piece is the same as or slightly smaller than the radius R2 of the bearing inner ring 6b, and has a slight assembly clearance. The actuating pieces 16m and 16b can be moved on the axis of the planetary pin 6 by the nut 15 via the washer 14.

As described above, the present invention has the following advantages.

(1) Since the operating pieces 16a, 16b, the planet pin 5, and the nut 15 constitute a wedge mechanism, the planet pin 5 turns 1, regardless of the accuracy of the operating pieces 16a, 16% and the planet pin 5. It can be assembled without any circumferential backlash.

(2) By increasing the tightening force of the nut 16, the radial gap existing in the planetary bearings 6m and 6b can be removed, so the preload mechanism for removing the radial gap, which was used independently in the past, is no longer necessary. Become.

(3) By achieving the above (1) and (2), it is possible to realize, at low cost, a completely backlash-free power transmission device that functions regardless of operating conditions.

(4) Mata. Since the planetary pins 5 are fixed to the carrier 7, the centrifugal force based on the weight of the planetary pins 5 does not act on the roller pressure contact surface, and the centrifugal force is significantly reduced, thereby improving high speed.

[Brief explanation of drawings]

Figures 1 and 2 show an example of a conventional planetary roller power transmission device. FIG. 8 to 5 show one embodiment of the present invention, FIG. 3 is a diagram corresponding to FIG. 1, and FIGS. 4 and 6 are the lines IV-IV and V-VS of FIG. FIG. l...Sun roller, 2...Planet roller, 5...Planetary pin, 6...Bearing, 6m...Rolling element, 6b...
Inner circle. 7...Carrier, 16 m, 16 b-actuation piece+ml+m2...Width across flats notch. $2 flash IF! , 3 tsuta 4 flashes

Claims (1)

[Claims] A plurality of planetary rollers are provided, which are circumscribed by a sun roller fixed to a first rotational shaft and housed in an inner roller fixed to a casing, and a planetary pin supporting the planetary rollers via a bearing number is connected to a second rotational shaft. fixed to the connected carrier and the first
In a rolling transmission device that transmits power between a rotating shaft and a second rotating shaft, a circumferential gap is provided between the inner ring of the bearing and the planetary pin, and an inclined notch surface provided on both sides of the planetary pin is provided. A semicircular column having a radius equal to or slightly smaller than the radius of the inner ring of the bearing is arranged radially with respect to the center of the sun roller, and is located in a space on both sides of the inner ring of the bearing and the inclined notch surface of the planetary pin. A planetary roller type power transmission device characterized by inserting an inclined operating piece.