JP2016200218A - Planetary roller type power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planetary roller type power transmission device with improved transmission efficiency.SOLUTION: A planetary roller type power transmission device includes: a first rotary shaft 10 having a sun roller 11; a first internal ring 12 which is restrained from moving in a circumferential direction relative to a casing 2; a second internal ring 14 connected to a second rotary shaft 13; two or more planetary rollers 15 which are in contact with the sun roller, the first internal ring, and the second internal ring; a carrier 16 which rotatably supports the planetary rollers through planetary shaft members 3; and bearings 61 and 62 which support the carrier so that the carrier may rotate relative to the first rotary shaft. The carrier has: a first carrier member 161 which supports a first end part of each planetary shaft member penetrating through the planetary roller; and a second carrier member 162 which supports a second end part of each planetary shaft member. The bearings has: the first bearing 61 which supports the first carrier member at a position located closer to a first end part side than the sun roller; and the second bearing 62 which supports the second carrier member at a position located closer to a second end part side than the sun roller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a planetary roller type power transmission device, and more specifically, a planetary roller type power transmission including two or more planetary rollers that are in contact with an outer peripheral surface of a sun roller and inner peripheral surfaces of two internal rings. It relates to the improvement of the apparatus.

  The planetary roller type power transmission device is a traction drive device that transmits power by pressing the planetary roller against the sun roller with lubricating oil interposed therebetween. Compared to the planetary gear type power transmission device, it is based on backlash. Less vibration and noise. For example, a planetary roller type power transmission device includes a sun roller, an internal ring, a planetary roller, and a carrier, and is used as a speed reducer that reduces the rotational output of an electric motor. The planetary roller is rotatably supported by the carrier via the planetary shaft member. In such a power transmission device, when the rotational force of the electric motor is input to the input shaft, torque is transmitted through the oil film between the sun roller, the planetary roller, and the internal ring.

  In addition, a speed reducer including a first internal ring that is restricted from moving in a circumferential direction with respect to the casing and a second internal ring that is coupled to the output shaft, the planetary roller having outer peripheral surfaces having different outer diameters. Conventionally known (for example, Patent Document 1). The planetary roller contacts outer peripheral surfaces having different outer diameters with inner peripheral surfaces of the first and second internal rings, respectively. The planetary shaft member penetrates the planetary roller, the input side end is supported by the input side carrier member, and the output side end is supported by the output side carrier member. This type of speed reducer uses the phenomenon that rotation according to the diameter difference of the outer peripheral surface occurs in the second internal ring when the planetary roller revolves around the sun roller while rotating by the rotation of the sun roller. This is a differential type power transmission device that takes out the rotational output, and a high reduction ratio can be obtained.

Japanese Utility Model Publication No. 3-118348

  If a load is applied to the output shaft, a twisting force acting on the planetary shaft member from the first and second internal rings acts on the planetary roller in accordance with the diameter difference between the outer peripheral surfaces. Further, since the rotation speed of the planetary roller changes according to the contact position with the first internal ring, the rotation speed is uneven among the plurality of planetary rollers. For this reason, in the conventional planetary roller type power transmission device described above, torque transmission is canceled and transmission efficiency may be reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a planetary roller type power transmission device with improved transmission efficiency. In particular, it is an object of the present invention to provide a planetary roller type power transmission device capable of suppressing fluctuations in the contact position between the planetary roller and the internal ring due to the twisting force acting on the planetary roller. .

  A planetary roller type power transmission device according to the present invention includes a sun roller, a first rotating shaft that is rotatably supported by a casing around a main shaft, and is accommodated in the casing and is circumferential with respect to the casing. An annular first internal ring that is restricted in movement, a second rotating shaft that is rotatably supported by the casing about the main shaft, and is accommodated in the casing and connected to the second rotating shaft. An annular second internal ring, two or more planetary rollers in contact with the outer peripheral surface of the sun roller, the inner peripheral surface of the first internal ring, and the inner peripheral surface of the second internal ring, and a planetary shaft A carrier that rotatably supports the planetary roller via a member, and a bearing that rotatably supports the carrier about the main shaft with respect to the first rotating shaft. Obtain. The planetary roller has a first outer peripheral surface in contact with the first internal ring and a second outer peripheral surface in contact with the second internal ring, and the first outer peripheral surface and the second outer peripheral surface The outer diameters are different from each other. The carrier includes a first carrier member that supports a first end portion of the planetary shaft member that passes through the planetary roller, and a second carrier member that supports a second end portion of the planetary shaft member. The bearing includes a first bearing that rotatably supports the first carrier member on the first end side of the sun roller, and the second carrier member on the second end side of the sun roller. And a second bearing rotatably supported.

  In the planetary roller type power transmission device according to the present invention, the planetary roller is constituted by the first carrier member supported via the first bearing and the second carrier member supported via the second bearing with respect to the first rotating shaft. Therefore, the rigidity of the planetary support mechanism is improved. For this reason, it can suppress that the contact position of a planetary roller and a 1st internal ring changes due to the twisting force which acts on a planetary roller. Therefore, the present invention can provide a planetary roller type power transmission device with improved transmission efficiency.

FIG. 1 is a cross-sectional view of a planetary roller type power transmission device 1 according to the first embodiment. FIG. 2 is a cross-sectional view showing a cut surface when the power transmission device 1 is cut along an A1-A1 cutting line. FIG. 3 is a cross-sectional view showing a cut surface when the power transmission device 1 is cut along an A2-A2 cutting line. FIG. 4 is a cross-sectional view of the planetary roller type power transmission device 1 according to the second embodiment. FIG. 5 is a cross-sectional view showing a cut surface when the power transmission device 1 is cut along a BB cutting line.

  Embodiments of the present invention will be described below with reference to the drawings. In this specification, for the sake of convenience, the direction of the main shaft is described as a horizontal direction, but the posture of the power transmission device according to the present invention is not limited. In the present specification, the direction of the main axis is simply referred to as “axial direction”, and the radial direction and the circumferential direction around the main axis are simply referred to as “radial direction” and “circumferential direction”.

Embodiment 1 FIG.
<Power transmission device 1>
FIG. 1 is a cross-sectional view showing a configuration example of a planetary roller type power transmission device 1 according to Embodiment 1 of the present invention, and a cut surface when the power transmission device 1 is cut by a vertical surface including a main shaft J. It is shown. In FIG. 1, the power transmission device 1 is drawn with the right side of the drawing as the input side and the left side as the output side. FIG. 2 is a cross-sectional view showing a cut surface when the power transmission device 1 of FIG. 1 is cut along an A1-A1 cutting line. FIG. 3 is a cross-sectional view showing a cut surface when the power transmission device 1 of FIG. 1 is cut along an A2-A2 cutting line. 2 and 3 show a case where the cut surface is viewed from the direction of the arrow.

  The main shaft J is a straight line that indicates a rotation center common to the input shaft 10, the sun roller 11, the output shaft 13, the movable ring 14, and the carrier 16. The power transmission device 1 is a speed reducer that decelerates and outputs a rotational motion input from an electric motor (not shown), and includes two or more planetary rollers 15, a casing 2, an input shaft 10, a fixing ring 12, The output shaft 13, the movable ring 14 and the carrier 16, and bearings 5, 61, 62, 7, 8 and 9 are configured. For example, the bearings 5 and 8 are ball bearings in which two or more spherical rolling elements are disposed between an outer ring and an inner ring.

<Case 2>
The casing 2 is a housing that houses a rolling member, which will be described later, and is fixed to a housing of an electric motor or the like. The casing 2 includes a cylindrical main body portion 21 having an opening on the input side, and a plate-like lid portion 22 disposed in the opening of the main body portion 21. The main body 21 has a cylindrical inner peripheral surface extending in the axial direction. The lid portion 22 has a through hole for arranging the input shaft 10 and is attached to the main body portion 21.

<Input shaft 10>
The input shaft 10 includes a sun roller 11 that circumscribes the planetary roller 15 and is a first rotating shaft that is rotatably supported by the casing 2 around the main shaft J, and receives a predetermined rotational force from the electric motor. . For example, the input shaft 10 is connected to a shaft of an electric motor.

  The input shaft 10 is rotatably supported by the lid portion 22 of the casing 2 via the bearing 5 on the input side of the sun roller 11, and is supported by the main body portion 21 of the casing 2 on the output side of the sun roller 11. The bearing 9, the output shaft 13 and the bearing 8 are rotatably supported.

  The bearing 5 is disposed inside the lid portion 22 in the radial direction. The bearing 8 is disposed at the output side end of the input shaft 10. The bearing 9 is a cross roller bearing for rotatably supporting the output shaft 13 around the main shaft J with respect to the main body portion 21 of the casing 2, and is disposed on the radially inner side of the output side end portion of the main body portion 21. The

  The cross roller bearing is a roller bearing in which two or more cylindrical rollers arranged to be inclined with respect to the axial direction are used as rolling elements, and rollers whose central axes intersect are alternately arranged in the circumferential direction. The rigidity with respect to the bending force of the output shaft 13 and the rigidity with respect to the radial radial load and the axial thrust load are high.

<Sun Roller 11>
The sun roller 11 is a cylindrical rolling member having an outer peripheral surface extending in the axial direction. The sun roller 11 has an outer diameter larger than that of the input shaft 10. The sun roller 11 is formed integrally with the input shaft 10.

<Internal ring>
Each of the fixed ring 12 and the movable ring 14 is a rolling member that inscribes the planetary roller 15 and is accommodated in the casing 2. The fixing ring 12 is an annular first internal ring that is restricted from moving in the circumferential direction with respect to the casing 2. The input side end of the fixing ring 12 is disposed coaxially with the input shaft 10.

  The movable ring 14 is an annular second internal ring connected to the output shaft 13. There is a gap between the movable ring 14 and the inner wall of the casing 2. That is, the outer peripheral surface of the movable ring 14 and the inner peripheral surface of the main body 21 are opposed to each other with a gap. In the power transmission device 1, it is possible to prevent the pressing force when the planetary roller 15 is urged radially inward by using the elasticity of the movable ring 14 from fluctuating depending on the circumferential position of the planetary roller 15. .

  In this power transmission device 1, the fixed ring 12 and the movable ring 14 are elastically deformed in the radial direction, thereby elastically urging the planetary roller 15 inward in the radial direction, for example, flexible metal elasticity. Consists of the body. Since the fixed ring 12 and the movable ring 14 are elastically deformed in the radial direction, the planetary roller 15 is urged inward in the radial direction, so that the transmission torque can be increased without providing an urging member separately. Can do.

<Output shaft 13>
The output shaft 13 is a second rotating shaft that is supported by the casing 2 so as to be rotatable about the main shaft J, and outputs a rotational force to a predetermined load. The movable ring 14 and the output shaft 13 are an assembly in which separate members are connected. In the power transmission device 1, by making the movable ring 14 and the output shaft 13 as separate members, it is possible to individually quench these members as necessary.

  The output shaft 13 includes an annular ring support portion 131 and a boss portion 132 that protrudes from the ring support portion 131 toward the output side, and is arranged coaxially with the input shaft 10. The ring support portion 131 is a support portion that supports the output side end portion of the movable ring 14, and is disposed radially inward of the output side end portion of the movable ring 14.

  The boss portion 132 is rotatably supported by the main body portion 21 of the casing 2 via the bearing 9. The boss portion 132 has an outer diameter larger than that of the input shaft 10 and rotates relatively at a low speed with respect to the casing 2 as compared with the input shaft 10 due to the rotational force of the electric motor.

  The bearing 9 is disposed between the outer peripheral surface of the boss portion 132 and the inner peripheral surface of the output side end portion of the main body portion 21. The bearing 8 is disposed between the inner peripheral surface of the boss portion 132 and the outer peripheral surface of the input shaft 10. The bearing 8 is in a position where at least a part thereof overlaps with the bearing 9 in the radial direction.

<Planetary roller 15>
The planetary roller 15 is a rolling member that contacts the outer peripheral surface of the sun roller 11, the inner peripheral surface of the fixed ring 12, and the inner peripheral surface of the movable ring 14, and is rotatably supported by the carrier 16. The planetary roller 15 has an outer peripheral surface 150 that contacts the sun roller 11, an outer peripheral surface 151 that contacts the fixed ring 12, and an outer peripheral surface 152 that contacts the movable ring 14. These outer peripheral surfaces 150 to 152 have different axial positions. Further, the outer peripheral surfaces 151 and 152 have an outer diameter smaller than that of the outer peripheral surface 150.

  The outer peripheral surface 151 is a first outer peripheral surface that is positioned adjacent to the input end of the outer peripheral surface 150 and is formed on the input side with respect to the outer peripheral surface 150. On the other hand, the outer peripheral surface 152 is a second outer peripheral surface that is located adjacent to the output end of the outer peripheral surface 150 and is formed on the output side of the outer peripheral surface 150. The outer peripheral surface 152 has an outer diameter smaller than that of the outer peripheral surface 151. Since the outer diameters of the outer peripheral surface 151 and the outer peripheral surface 152 of the planetary roller 15 are different, a desired reduction ratio can be obtained.

  In the power transmission device 1, the contact surface 111 on the sun roller 11 with respect to the outer peripheral surface 150 and the contact surface 121 on the fixing ring 12 with respect to the outer peripheral surface 151 do not overlap in the radial direction. Is shifted to the input side from the contact surface 111. Further, the contact surface 111 on the sun roller 11 with respect to the outer peripheral surface 150 and the contact surface 141 on the movable ring 14 with respect to the outer peripheral surface 152 do not overlap in the radial direction, and the axial position of the contact surface 141 is the contact surface. 111 is shifted to the output side.

<Carrier 16>
The carrier 16 is a support member that rotatably supports the planetary roller 15 via the planetary shaft member 3, and is arranged coaxially with the input shaft 10. The carrier 16 is a support member common to two or more planetary rollers 15.

  The planetary shaft member 3 is a carrier pin for supporting the planetary roller 15 and penetrates the planetary roller 15. The bearings 61 and 62 support the carrier 16 so as to be rotatable about the main shaft J with respect to the input shaft 10. The carrier 16 includes a first carrier member 161 that supports the input side end of the planetary shaft member 3, and a second carrier member 162 that supports the output side end of the planetary shaft member 3.

  The first carrier member 161 has an annular shape and is rotatably supported by the input shaft 10 via the bearing 61. The bearing 61 is a first bearing that rotatably supports the first carrier member 161 on the input side from the sun roller 11. The bearing 61 is a ball bearing having high rigidity with respect to a radial radial load, and is disposed radially inward of the first carrier member 161. The first carrier member 161 and the bearing 61 are disposed radially inward of the fixing ring 12 on the input side with respect to the contact surface 121.

  The second carrier member 162 has an annular shape and is rotatably supported by the input shaft 10 via the bearing 62. The bearing 62 is a second bearing that rotatably supports the second carrier member 162 on the output side of the sun roller 11. The bearing 62 is a ball bearing having high rigidity with respect to a radial radial load, and is disposed radially inward of the second carrier member 162. The second carrier member 162 and the bearing 62 are disposed radially inward of the movable ring 14 on the output side of the contact surface 141.

  Needle bearings 41 and 42 are disposed in the planetary roller 15. Each of the needle bearings 41 and 42 is a roller bearing that uses two or more needle rollers extending in the direction of the rotation axis of the planetary roller 15 as rolling elements, and supports the planetary roller 15 rotatably with respect to the planetary shaft member 3. To do.

  The needle bearing 41 is a first needle bearing at a position at least partially overlapping the outer peripheral surface 151 of the planetary roller 15 in the radial direction with respect to the rotation axis of the planetary roller 15. On the other hand, the needle bearing 42 is a second needle bearing that is at least partially overlapped with the outer peripheral surface 152 of the planetary roller 15 in the radial direction.

  A thrust bearing 7 is disposed between the planetary roller 15 and the first carrier member 161. The thrust bearing 7 is a bearing having high rigidity with respect to an axial thrust load, and has a shape surrounding the planetary shaft member. For example, the thrust bearing 7 is disposed on the output side, two or more spherical rolling elements, a cage that holds the rolling elements at a certain interval in the circumferential direction, a raceway plate disposed on the input side, and the output side. The rolling plate is arranged between the raceway plates.

  In the illustrated power transmission device 1, four planetary rollers 15 are arranged at equal intervals in the circumferential direction. Each planetary roller 15 is accommodated in the fixed ring 12 and the movable ring 14 while being circumscribed by the sun roller 11. The movable ring 14 is thicker than the fixed ring 12 at the position of the contact surface 141. The planetary shaft member 3 and the thrust bearing 7 are arranged for each planetary roller 15.

  Each part which comprises the power transmission device 1 by this Embodiment is as above-mentioned. Below, the relationship between these components and the effect produced by it are demonstrated in detail.

(1) Improvement of transmission efficiency A twisting force from the fixed ring 12 and the movable ring 14 to the planetary shaft member 3 acts on the planetary roller 15 according to the diameter difference between the outer peripheral surfaces 151 and 152. Further, the rotation speed of the planetary roller 15 changes according to the contact position with the internal ring. In the conventional power transmission device, the contact position changes due to the twisting force, and rotation speed unevenness occurs between the plurality of planetary rollers 15. For this reason, there is a problem that torque transmission is canceled and transmission efficiency is lowered.

  On the other hand, in the power transmission device 1 according to the present embodiment, the first carrier member 161 supported via the bearing 61 and the second carrier member 162 supported via the bearing 62 with respect to the input shaft 10. A plurality of planetary shaft members 3 constitutes a cage-like planetary support mechanism. For this reason, the rigidity of the planetary support mechanism that supports the plurality of planetary rollers 15 is improved. Therefore, the change in the contact position due to the twisting force is suppressed, and it is difficult for the torque transmission to be canceled due to uneven rotation speed. Therefore, the transmission efficiency of the power transmission device 1 can be improved.

  Further, in the power transmission device 1 according to the present embodiment, since the thrust bearing 7 receives the axial load, the planetary roller 15 is the first carrier member even when the axial load is applied to the planetary roller 15. 161 can be prevented from contacting.

  A load acts on the planetary roller 15 radially inward from the fixed ring 12 and the movable ring 14. On the other hand, both ends of the planetary shaft member 3 are supported by carrier members 161 and 162. For this reason, bending stress acts on the rolling element of the needle bearing extending in the axial direction, and the frictional resistance when the planetary roller 15 rotates is increased. In the power transmission device 1 according to the present embodiment, since the needle bearing is divided into needle bearings 41 and 42, bending stress applied to the rolling elements is dispersed, and an increase in frictional resistance is suppressed.

(2) Improvement of load capacity In the power transmission device 1 according to the present embodiment, the use of a cross roller bearing as the bearing 9 increases the rigidity against the radial load and the axial load acting on the output shaft 13, thereby improving the load capacity. Can be made.

Embodiment 2. FIG.
In Embodiment 1, the example in case the planetary roller 15 has the outer peripheral surfaces 150-152 was demonstrated. On the other hand, in the present embodiment, a case where the outer peripheral surface 151 of the planetary roller 15 is positioned adjacent to the outer peripheral surface 152 will be described.

  FIG. 4 is a cross-sectional view showing a configuration example of a planetary roller type power transmission device 1 according to Embodiment 2 of the present invention, and a cut surface when the power transmission device 1 is cut by a vertical surface including the main shaft J. It is shown. In FIG. 4, the power transmission device 1 is drawn with the right side of the paper as the input side and the left side as the output side. FIG. 5 is a cross-sectional view showing a cut surface when the power transmission device 1 of FIG. 4 is cut along a BB cutting line, and shows a case where the cut surface is viewed from the direction of the arrow.

  Compared with the power transmission device 1 of FIGS. 1 to 3, the power transmission device 1 has a configuration of the planetary roller 15, a position of the thrust bearing 7, a configuration of the output shaft 13 and the movable ring 14, and a lid of the casing 2. The configuration of the unit 22 is different. The lid portion 22 of the casing 2 has a boss portion 221 that protrudes toward the input side, and the bearing 5 is disposed radially inward of the boss portion 221.

  The input side end portion of the fixing ring 12 is fixed to the lid portion 22 using a fastening component 23 such as a screw in a state where the end surface is in contact with the lid portion 22. The outer peripheral surface of the fixing ring 12 and the inner peripheral surface of the main body 21 are opposed to each other through a gap. The output shaft 13 and the movable ring 14 are integrally formed using the same material. The thrust bearing 7 is disposed between the planetary roller 15 and the second carrier member 162.

  The planetary roller 15 has an outer peripheral surface 151 that contacts the sun roller 11 and the fixed ring 12, and an outer peripheral surface 152 that contacts the movable ring 14. The outer peripheral surface 151 is located adjacent to the outer peripheral surface 152 and has an outer diameter larger than that of the outer peripheral surface 152. The contact surface 111 on the sun roller 11 with respect to the outer peripheral surface 151 and the contact surface 121 on the fixing ring 12 with respect to the outer peripheral surface 151 overlap each other in the radial direction, and the axial position of the contact surface 121 and the contact surface 111 The position in the axial direction matches.

  In the power transmission device 1 according to the present embodiment, when the outer peripheral surface 151 of the planetary roller 15 is brought into contact with the fixing ring 12 and the sun roller 11, the outer peripheral surface brought into contact with the sun roller 11 is provided separately from the outer peripheral surface 151. In comparison, the axial size can be reduced.

  Further, in the power transmission device 1 according to the present embodiment, since there is a gap between the fixing ring 12 and the inner wall of the casing 2, the planetary roller 15 is urged radially inward using the elasticity of the fixing ring 12. It is possible to prevent the pressing force at the time of the movement from fluctuating depending on the circumferential position of the planetary roller 15.

  Further, in the power transmission device 1 according to the present embodiment, since the thrust bearing 7 receives the axial load, the planetary roller 15 is the second carrier member even when the axial load acts on the planetary roller 15. Contact with 162 can be prevented.

  In Embodiments 1 and 2, an example in which the sun roller 11 is formed integrally with the input shaft 10 has been described. However, in the present invention, the sun roller 11 and the first rotation shaft are formed by separate members. It may be configured to be formed.

  In the first and second embodiments, the casing 2 is fixed to the housing of the electric motor or the like, and the rotational force of the electric motor is transmitted to the sun roller 11 via the input shaft 10 and output shaft 13 via the movable ring 14. Although the example in the case of outputting a rotational force from was demonstrated, this invention does not limit the usage form of the power transmission device 1 to this.

  For example, the power transmission device 1 can be used as a speed increaser that changes the roles of the input shaft 10 and the output shaft 13 to increase the speed of the rotation of the electric motor for output. Further, the power transmission device 1 may be configured such that the casing 2 is formed integrally with a housing of an electric motor or a casing of another power transmission device such as a transmission or a gearbox. Alternatively, the power transmission device 1 may be configured such that a casing common to the electric motor or another power transmission device is used as the casing 2.

DESCRIPTION OF SYMBOLS 1 Power transmission device 10 Input shaft 11 Sun roller 12 Fixed ring 13 Output shaft 131 Ring support part 132 Boss part 14 Movable ring 15 Planetary roller 151 First outer peripheral surface 152 Second outer peripheral surface 16 Carrier 161 First carrier member 162 Second carrier Member 2 Casing 21 Body 22 Lid 3 Planetary shaft member 41 First needle bearing 42 Second needle bearing 5, 61, 62, 7, 8, 9 Bearing J Main shaft

Claims (7)

A first rotating shaft having a sun roller and supported rotatably around the main shaft by a casing;
An annular first internal ring that is housed in the casing and is limited in circumferential movement relative to the casing;
A second rotating shaft that is rotatably supported by the casing about the main shaft;
An annular second internal ring housed in the casing and connected to the second rotating shaft;
Two or more planetary rollers in contact with the outer peripheral surface of the sun roller, the inner peripheral surface of the first internal ring and the inner peripheral surface of the second internal ring;
A carrier that rotatably supports the planetary roller via a planetary shaft member;
A bearing that rotatably supports the carrier around the main shaft with respect to the first rotation shaft;
The planetary roller has a first outer peripheral surface in contact with the first internal ring and a second outer peripheral surface in contact with the second internal ring, and the first outer peripheral surface and the second outer peripheral surface The outer diameters are different from each other,
The carrier has a first carrier member that supports a first end of the planetary shaft member that passes through the planetary roller, and a second carrier member that supports a second end of the planetary shaft member;
The bearing includes a first bearing that rotatably supports the first carrier member on the first end side of the sun roller, and the second carrier member on the second end side of the sun roller. A planetary roller type power transmission device comprising a second bearing rotatably supported.   The first outer peripheral surface of the planetary roller is positioned adjacent to the second outer peripheral surface, and contact surfaces of the sun roller and the first internal ring with respect to the first outer peripheral surface overlap each other in the radial direction. The planetary roller type power transmission device according to claim 1.   The planetary roller according to claim 1, further comprising a thrust bearing disposed between the planetary roller and the first carrier member or the second carrier member and surrounding the planetary shaft member. Power transmission device. A needle bearing disposed in the planetary roller and rotatably supporting the planetary roller with respect to the planetary shaft member;
The needle bearing has a first needle bearing at a position at least partially overlapping with the first outer peripheral surface in the radial direction, and a second needle at least at a position overlapping with the second outer peripheral surface in the radial direction. The planetary roller type power transmission device according to claim 1, further comprising a bearing.   5. The planetary roller power transmission device according to claim 1, further comprising a cross roller bearing that rotatably supports the second rotation shaft about the main shaft with respect to the casing. .   The planetary roller type power transmission device according to any one of claims 1 to 5, wherein the second internal ring and the second rotating shaft are an assembly in which separate members are connected.   The planetary roller type power transmission device according to any one of claims 1 to 6, wherein the first internal ring or the second internal ring has a gap between an inner wall of the casing.

Images