JP2021095965A - Planetary roller type friction transmission gear - Google Patents

Abstract

To provide a planetary roller type friction transmission gear which maintains transmission functions, such as acceleration and deceleration, without causing damage to components in a device when a prescribed torque value occurs in a rotary shaft.SOLUTION: A planetary roller type friction transmission gear 10 includes: a case 11 having a recessed part 12 therein; an outer ring 13 housed in the recessed part 12 of the case 11; a sun roller 16 located at a center part of the outer ring 13; and planetary rollers 17 each of which is disposed at a periphery of the sun roller 16 and formed into a hollow shape. In the planetary roller type friction transmission gear 10, a disc spring 18 is disposed in the recessed part 12 of the case 11 so as to compress an end surface of the outer ring 13.SELECTED DRAWING: Figure 1

Description

The present invention relates to a planetary roller type friction conduction device used in industrial machines, electric vehicles, and the like.

A planetary roller type friction conduction device having a planetary roller built in various industrial machines as a component is mainly used as an accelerator or a transmission device. The planetary roller type friction conduction device has a solar roller in the center and a plurality of planetary rollers around the solar roller. Around these planetary rollers, an outer ring fixed so as not to rotate by parts such as bolts is generally installed.

The internal structure of the conventional planetary roller type friction conduction device 100 is shown in FIG. 7, and the cross-sectional view taken along line ZZ is shown in FIG. 8, respectively. As shown in FIGS. 7 and 8, the planetary roller type friction conduction device 100 includes a solar roller 101 and a planetary roller 102, and the outer ring 103 is fixed in the case 104 by a pin 105. The planetary roller type friction conduction device 100 can obtain a predetermined gear ratio when it is used as an accelerator / reducer by rotating two rotating shafts 106 and 107 (see Patent Document 1).

Japanese Unexamined Patent Publication No. 11-303960

However, when an excessive torque exceeding the rotation speed specified for the rotating shafts 106 and 107 is generated in the device 100, the components such as the solar roller 101, the planetary roller 102, and the outer ring 103 come into contact with each other. Causes abnormal wear, which in turn leads to damage to each part. Further, if such a state continues, abnormal noise and excessive vibration are generated in the device 100, which affects various devices adjacent to the device 100.

Therefore, it is an object of the present invention to provide a planetary roller type friction conduction device that maintains a shifting function such as acceleration / deceleration without damaging parts in the device when a specified torque value is generated on the rotating shaft.

The planetary roller type friction conduction device of the present invention includes a case having a recess inside, an outer ring housed in the recess of the case, a solar roller located at the center of the outer ring, and a hollow arranged around the solar roller. It is equipped with a plurality of planetary rollers formed in a shape. A disc spring is arranged in the recess of this case so as to pressurize the end face of the outer ring.

Further, an electric motor in which an opening is provided in a part of the case, the outer peripheral surface of the outer ring is formed in a gear shape, and an external gear that meshes with the outer peripheral surface of the outer ring through the opening is provided on the rotating shaft. It may be a planetary roller type friction conduction device provided with.

The planetary roller type friction conduction device of the present invention exerts functions such as speeding up and decelerating to a predetermined torque value on the rotating shaft, and the outer ring rotates even when an excessive torque is suddenly generated. It is possible to prevent damage to the parts inside. Further, the same effect can be obtained by engaging the gear provided on the outer peripheral surface of the outer ring with the external gear of the rotating shaft of the motor provided outside the case.

It is a front view of the planetary roller type friction conduction device 10 of 1st Embodiment. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a front view of the planetary roller type friction conduction device 20 of 2nd Embodiment. FIG. 3 is a cross-sectional view taken along the line BB of FIG. It is a front view of the test apparatus 50 used in an Example. It is sectional drawing of the measuring part 60 which comprises the test apparatus 50 of FIG. It is a front view of the conventional planetary roller type friction conduction device 100. FIG. 7 is a cross-sectional view taken along the line ZZ of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. A front view of the planetary roller type friction conduction device 10 (first embodiment) of the present invention is shown in FIG. 1, and a sectional view taken along line AA of the planet roller type friction conduction device 10 shown in FIG. 1 is shown in FIG.

As shown in FIG. 1, the planetary roller type friction conduction device 10 of the present invention has a case 11 on the outermost side, and an outer ring 13 is installed in a recess 12 inside the case 11. As shown in FIG. 2, three planetary rollers 17 (17a, 17b, 17c) are arranged inside the outer ring 13 around the solar roller 16 with the solar roller 16 as the center. These three planetary rollers 17 (17a, 17b, 17c) are hollow rollers having a hollow inside, and are fitted in a predetermined position of the holder 90.

Therefore, the rollers 17 (17a, 17b, 17c) can rotate around the solar roller 16 while a predetermined distance is maintained at the positions (intervals) between the rollers 17 (17a, 17b, 17c). Further, the solar roller 16 is connected to the first rotating shaft (shaft) 14 supported by the rolling bearing BR1, and the holder 90 is connected to the second rotating shaft (shaft) 15 supported by the rolling bearing BR2. ing.

One end surface side (right side in the drawing) of the outer ring 13 is in contact with the disc spring 18 from the outside of the case 11 by a lid material (cover part) 19. The lid material (cover component) 19 is fitted from the outside of the case 11, and the disc spring 18 bends to generate compressive stress on the end face of the outer ring 13. That is, the disc spring 18 is fitted into the recess 12 of the case 11 so as to pressurize the end surface of the outer ring 13. Therefore, compressive stress is generated in the outer ring 13 with respect to the recess 12 of the case 11, and the planet rollers 17 (17a, 17b, 17c) are fixed while rotating at a predetermined rotation speed.

Next, a front view of the planetary roller type friction conduction device 20 of the second embodiment is shown in FIG. 3, and a sectional view taken along line BB of the planet roller type friction conduction device 20 shown in FIG. 3 is shown in FIG. The configuration of the planetary roller type friction conduction device 20 shown in FIGS. 3 and 4 is the case 21 having the recess 22 inside and the recess 22 of the case 21 similar to the planet roller type friction conduction device 10 shown in FIGS. 1 and 2. It includes an outer ring 23 housed, a solar roller 26 located at the center of the outer ring 23, and a plurality of hollow planetary rollers 27 arranged around the solar roller 26.

Further, the planetary roller type friction conduction device 20 has a solar roller 26, a first rotating shaft (shaft) 24 supported by a rolling bearing BR11, and a holder 91 for holding a plurality of planetary rollers 27 at predetermined intervals. It has a second rotating shaft (shaft) 25 supported by the rolling bearing BR14.

The difference between the planetary roller type friction conduction device 20 of the second embodiment and the planetary roller type friction conduction device 10 (first embodiment) shown in FIG. 1 and the like is that the outer peripheral surface 23S of the outer ring 23 is formed in a gear shape. The point is that the motor 40 is provided with an external gear 42 on the rotating shaft 41 that meshes with the outer peripheral surface 23S of the outer ring 23 through the opening 45 provided in the case 21. Further, in the outer ring 23, two rolling bearings BR12 and BR13 are arranged on both end surfaces in the axial direction (left-right direction in the drawing).

In this planetary roller type friction conduction device 20, the rotating shaft 41 is excited by energizing the electric motor 40, and its rotation can be controlled. Since the external gear 42 provided at the tip of the rotating shaft 41 meshes with the outer ring 23, at least the rotation of the outer ring 23 is suppressed while the rotation of the rotating shaft 41 is suppressed. That is, as long as the plurality of planetary rollers 27 rotate within a predetermined rotation speed range, the outer ring 23 continues to be fixed in the recess 22 of the case 21.

Using the planetary roller type friction conduction device of the present invention, a measurement test of the torque at which the outer ring built in the case starts to rotate (hereinafter referred to as the starting torque) was performed. The measurement results will be described with reference to the drawings. A front view of the test device 50 used in this embodiment is shown in FIG. 5, and a cross-sectional view of the measuring unit 60 forming the test device 50 is shown in FIG.

In the test apparatus 50, as shown in FIG. 6, the measuring unit 60 is fixedly installed on the test table T with bolts B1. As shown in FIG. 5, the upper part of the measuring unit 60 has a twisting shaft (first rotating shaft) 61 vertically upward and is connected to the torque converter 70. A twisting arm (torque wrench) 80 is attached above the torque converter 70. The value of the rotational torque (starting torque) generated by rotating the torsion shaft 61 via the torsion arm (torque wrench) 80 was measured by the torque converter 70.

As shown in FIG. 6, the measuring unit 60 incorporates the outer ring 62 into the recess 65 in the case 64, installs the disc spring 63 on the end surface (lower side of the drawing) of the outer ring 62, and installs the lid member 66 and the case. 64 are tightened to each other with bolts B2. As a result, the lid member 66 comes into close contact with the case 64 and the disc spring 63 bends to generate a predetermined compressive stress. The case 64 and the lid member 66 used in this measurement test were measured using two types, one made of cast iron and the other made of aluminum alloy. The measurement results (starting torque: unit is Nm) of this test are shown in Table 1 separately when the case 64 and the lid member 66 are made of cast iron and aluminum alloy.

In this test, when the case and the lid member were made of cast iron as shown in Table 1, the measured starting torque was in the range of 94 to 99 Nm. When the case and the lid member were made of aluminum alloy, the range was 126 to 135 Nm. In each case, it was within the range of 10 Nm.

Based on the above test results, even if the planetary roller type friction conduction device of the present invention is incorporated into an automobile acceleration / deceleration machine and an excessive torque is suddenly generated, the outer ring rotates and the built-in parts are equipped with a torque limiter. It turns out that damage can be avoided.

10,20 Planetary roller type friction conduction device 11 and 21 Cases 12, 22 Recesses 13, 23 Outer ring 14, 24 First rotation shaft 15, 25 Second rotation shaft 16, 26 Solar rollers 17, 27 Planet rollers 18 Belleville spring 19 Lid member 40 Motor 41 Motor rotation shaft 42 External gear 45 Opening 90, 91 Holder

Claims (2)

A case having a recess on the inside, an outer ring housed in the recess of the case, a solar roller located at the center of the outer ring, and a plurality of hollow formed bodies arranged around the solar roller. A planetary roller type friction conduction device, further comprising a planetary roller, wherein a disc spring is arranged in a recess of the case so as to pressurize the end surface of the outer ring. A case having a recess inside, an outer ring housed in the recess of the case, a solar roller located at the center of the outer ring, and a plurality of hollow formed bodies arranged around the solar roller. The outer peripheral surface of the outer ring is formed in a gear shape, and an external gear that meshes with the outer peripheral surface of the outer ring through an opening provided in the case serves as a rotation shaft. A planetary roller type friction conduction device characterized by further equipped with an provided electric motor.

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