JP2002243008A - Planetary roller transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate a shaft directional movement of planetary rollers while relieving sliding resistance between collar rings and the planetary rollers in a planetary roller transmission. SOLUTION: This planetary roller transmission has a fixed ring 2 installed and fixed in a housing 1, a sun shaft 3 coaxially arranged inside the fixed ring 2, a plurality of planetary rollers 4 interposed between the fixed ring 2 and the sun shaft 3 in a pressure contact state, a carrier 5 for rotatably supporting the planetary rollers 4, and the collar rings 8 and 9 supported on an end surface of the fixed ring 2 on both end sides of the planetary rollers 4, and regulating the shaft directional movement of the planetary rollers 4. The collar rings 8 and 9 are arranged so as to be separable in the shaft direction to the end surface of the fixed ring 2. Energizing members 16 and 17 are arranged between a back face of the collar rings 8 and 9 and the housing 1 for energizing the collar rings 8 and 9 to the end surface of the fixed ring 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary roller transmission used as a transmission.

[0002]

2. Description of the Related Art Conventionally, a planetary roller type transmission shown in FIG. 3 is known. That is, a fixed wheel 2 mounted and fixed in the housing 1, a sun shaft 3 coaxially disposed inside the fixed wheel 2, and a plurality of pressure wheels interposed between the fixed wheel 1 and the sun shaft 3. Planetary roller 4 and planetary roller 4
The carrier 5 is rotatably supported, and the collars 8 and 9 are supported by the end faces 2a and 2b of the stationary wheel 2 at both ends 4a and 4b of the planetary roller 4 and restrict the axial movement of the planetary roller 4. I have.

[0003] The carrier 5 is an input / output member, and is formed of a shaft 6 and an annular flange 7 having pins 10 planted at several locations on one end of the shaft 6. The planetary roller 4 is rotatably supported by the pin 10 via the needle roller bearing 11. Further, the collars 8, 9
The outer end portions 8a and 9a are fixed by being clamped between the end surfaces 2a and 2b of the fixed wheel 2 and the housing 1 for mounting and fixing the fixed wheel 2, and the inner end portions 8b and 9b are fixed to the end surfaces 4a and
The end faces 4a and 4b extend in parallel with the end faces 4a and 4b and are brought into sliding contact. The axial movement of the planetary roller 4 is restricted by the collar structure.

[0004] The operation of the transmission includes a deceleration output from the carrier 5 when the sun shaft 3 is input,
When the carrier 5 is used as an input, speed-up outputs are obtained from the sun shaft 3.

[0005]

Generally, in a planetary roller transmission, when the apparatus is rotated without the collars 8 and 9, the planetary roller 4 moves in the axial direction and the one end face of the fixed wheel 2 is moved. 2a, the planetary roller 4 starts to move in the opposite direction in the axial direction and continues to return to the original position when the rotation is further continued. It has been empirically known that there is a behavior of performing an alternate axial movement of moving in the opposite direction in the axial direction and then returning. For this reason, in the conventional planetary roller transmission, the inner ends 8b and 9b of the collar wheels 8 and 9 fixed to the both end surfaces 2a and 2b of the fixed wheel 2 in the axial direction are fixed to the both end surfaces 4a and 4b of the planetary roller 4. , And the axial movement of the planetary roller 4 is completely restricted, and the rotational stability of the planetary roller 4 is maintained. However, in this conventional planetary roller transmission, the collars 8 and 9 and both end faces 4 of the planetary roller 4 are not provided.
a and 4b are always slid in the initial assembled state, and the sliding resistance between the end faces 4a and 4b of the planetary roller 4 and the collar rings 8 and 9 is extremely high due to the axial moving force of the planetary roller 4. And the increased sliding resistance causes rotation resistance and uneven rotation resistance of the planetary roller transmission.

According to the present invention, in a planetary roller transmission, the collar can be separated from the end face of the fixed ring in the axial direction, and the collar is urged to the end face of the fixed ring by an urging member, thereby making it possible to reduce the diameter of the collar. An object of the present invention is to regulate the axial movement of the planetary roller while reducing the sliding resistance between the planetary rollers.

[0007]

As means for solving the above-mentioned problems, according to the first aspect of the present invention, a fixed wheel mounted and fixed in a housing, a sun shaft arranged coaxially inside the fixed wheel, and a fixed wheel are provided. A plurality of planetary rollers interposed in pressure contact with the sun shaft, a carrier rotatably supporting the planetary rollers, and a stationary wheel end face supported at both ends of the planetary rollers to restrict axial movement of the planetary rollers. A planetary roller transmission having a collar, wherein the collar is disposed so as to be axially separable from the fixed ring end face, and a biasing member for biasing the collar to the fixed ring end face between the rear face of the collar and the housing. Are arranged.

[0008] The invention according to claim 2 is characterized in that the biasing member is a spring.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. 1 and 2 show an embodiment of the planetary roller transmission according to the present invention. The same parts as those of the conventional device in FIG. 3 are denoted by the same reference numerals. Fixed wheel 2 mounted and fixed to concave peripheral step 12 in housing 1
A sun shaft 3 coaxially arranged inside the fixed wheel 2, a plurality of planetary rollers 4 interposed in a press-contact state between the fixed wheel 2 and the sun shaft 3, and the planetary roller 4 is rotatably supported. And a disk-shaped collar ring 8, 9 arranged on both end surfaces 2 a, 2 b of the fixed ring 2.

The carrier 5 is an input / output member, and is formed of a shaft 6 and an annular flange 7 having pins 10 planted at several locations on one end of the shaft 6. The planetary roller 4 is rotatably supported by the pin 10 via the needle roller bearing 11.

Further, the housing 1 is divided into two in the axial direction at a central portion in the axial direction of a concave peripheral step portion 12 formed on the inner peripheral surface.
The outer peripheral portion of the fixed wheel 2 is fitted and fixed in the concave peripheral step portion 12 by bolts 13. As a result, the fixed wheel 2 is formed on the concave peripheral step 1 of the housing 1.
2 and fixed.

Further, at both shoulders of the concave peripheral step 12, there are further formed cross-sectional peripheral steps 14, 15 respectively. Outer ends 8a, 9a of the collar rings 8, 9 are formed.
Are located along the end faces 2a, 2b of the fixed wheel 2,
9 is the bottom surface 14a, 15a of the peripheral steps 14, 15
The diameter is smaller than the inner diameter, and it can be separated from the fixed wheel 2 in the axial direction. Also, the inner ends 8b, 9b of the collar rings 8, 9
Extend parallel to the end faces 4a and 4b of the planetary roller 4 and are in sliding contact along the end faces 4a and 4b of the planetary roller 4. Further, between the back surfaces 8c, 9c (side surfaces opposite to the fixed ring end surfaces 2a, 2b) of the respective collar rings 8, 9 and the side surfaces 14b, 15b of the above-mentioned "circular step portions 14, 15", the collar ring 8, 9 is provided. 9
The urging members 16 and 17 for urging the fixed wheels 2 against the end surfaces 2a and 2b of the fixed wheel 2 are arranged. This urging member 1
The urging forces 6 and 17 are set so as to allow axial movement within a range where the performance of the planetary roller 4 does not deteriorate. Further, the biasing members 16 and 17 may be provided with various springs such as a coil spring in FIG. 1, an elastic body such as rubber, and other various configurations. However, it is more optimal to use a spring because of the ease of applying the urging force and the simplicity of the configuration. A plurality of the urging members 16 and 17 may be arranged on the circumference of the collar rings 8 and 9, or may be formed in a single shape continuous in a circle on the circumference.

Next, the operation of the planetary roller 4 and the collars 8, 9 will be described. By rotating the planetary roller transmission,
The planetary roller 4 moves to one side in the axial direction and tries to protrude from the one end surface 1 a of the fixed wheel 2. At this time, the planetary roller 4
Moves against the urging force of the urging member 16 to the extent that its rotational performance is guaranteed, while pushing the collar 8 in the axial direction. The movement of the planetary roller 4 is restricted by the collar 8 by the urging force of the urging member 16 when the planetary roller 4 moves to the predetermined allowable axial movement range. Similarly, when the planetary roller 4 moves in the other axial direction, when the predetermined amount of axial movement overcomes the biasing member 17 and is allowed, further axial movement is limited by the collar 9. This operation prevents the rotation performance of the planetary roller 4 from deteriorating, while reducing the diameter of the collar wheels 8 and 9.
And the sliding resistance between the end faces 4a and 4b of the planetary roller 4 can be reduced as much as possible in comparison with the conventional structure.

[0014]

In the planetary roller transmission according to the first aspect of the present invention, the collar is disposed so as to be axially separable from the fixed ring end face, and the collar is attached to the fixed ring end face between the rear face of the collar and the housing. By arranging the biasing member for biasing, a predetermined amount of axial movement of the planetary roller is allowed, so that the sliding resistance between the collar and the end face of the planetary roller can be reduced as much as possible with the conventional structure. As a result, the rotation resistance and the rotation resistance unevenness of the planetary roller transmission can be reduced.

According to the second aspect of the present invention, since the urging member is a spring, the urging force can be easily applied and the structure is simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a planetary roller transmission according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional planetary roller transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Fixed wheel 3 Sun shaft 4 Planetary roller 5 Carrier 6 Shaft 7 Annular flange 8 Collar ring 9 Collar ring 10 Pin 11 Needle roller bearing 16 Urging member 17 Urging member

Claims (2)

[Claims] A fixed wheel mounted and fixed in a housing;
A sun shaft arranged coaxially inside the fixed wheel, and a plurality of planetary rollers interposed in a press-contact state between the fixed wheel and the sun shaft,
A planetary roller transmission, comprising: a carrier that rotatably supports a planetary roller; and a collar that supports axial ends of the planetary roller by being supported on end faces of a stationary wheel at both ends of the planetary roller. A planetary roller transmission, characterized in that the planetary roller transmission is arranged so as to be axially separable from the end face, and that an urging member for urging the collar ring to the fixed ring end face is provided between the rear face of the collar ring and the housing. 2. The planetary roller transmission according to claim 1, wherein the biasing member is a spring.