JP6472958B2 - Wheel-in speed reducer and wheel unit - Google Patents

Description

  The present invention relates to a wheel-in speed reducer and a wheel unit.

In a device such as a wheelchair or an automatic guided vehicle, the wheel is rotated by increasing the torque by decelerating the rotational motion obtained from the motor. In these devices, it is conventionally known to use a wheel-in speed reduction device in which a speed reducer is arranged inside a wheel. An example of the wheel-in speed reducer is described in, for example, Japanese Patent Application Laid-Open No. 2008-17588. In the reduction gear of the publication, power is transmitted using a planetary gear mechanism having a sun gear and a planetary gear (see paragraph 0027 and the like).
JP 2008-17588 A

  However, in a device using a wheel-in speed reducer, if a motor failure or battery runs out, it becomes impossible to rotate the wheel connected to the motor. In that case, a person tries to manually push the device to move it, but if a reduction mechanism with a high reduction ratio (ie, torque amplification ratio) is incorporated, a very large external force is required to rotate the wheel. .

  In particular, when a motor is built in each wheel, there is a problem that it becomes difficult to move the entire device using the wheel-in reduction device when at least one of the plurality of motors stops.

  In order to reduce the external force required for manually rotating the wheel, it is conceivable to disconnect a part of the power transmission path in the speed reduction mechanism. However, as described in Japanese Patent Application Laid-Open No. 2008-17588, when power is transmitted by meshing between gears, the meshing between the gears cannot be released only by slightly separating the gears. Therefore, in order to release the meshing, at least one of the gears must be greatly displaced.

  An object of the present invention is to provide a structure that can reduce a part of a speed reduction mechanism with a slight amount of displacement and reduce an external force necessary for the rotation of the wheel in a wheel-in speed reduction device when it is desired to rotate the wheel with an external force. is there.

An exemplary first invention of the present application includes a sun roller that rotates about a rotation axis, a plurality of planetary rollers disposed around the sun roller, and an annular internal ring that contacts the plurality of planetary rollers. A housing that surrounds the internal ring, a plurality of carrier pins that rotatably support each of the plurality of planetary rollers, a wheel that is fixed to ends of the plurality of carrier pins, and the internal ring. A pressure mechanism that presses the planetary roller toward the planetary roller, and the plurality of planetary rollers receive power from the sun roller while being in contact with both the sun roller and the internal ring. A wheel-in speed reducing device that revolves around the rotation axis while rotating, the inner ring and the planetary roller being Further comprising a release mechanism for releasing come, the planetary rollers Oyo
And at least one of the internal rings has an inclined surface inclined with respect to the rotation axis.
The pressurizing mechanism presses the internal ring in the axial direction, thereby
And the other of the planetary roller and the internal ring are in contact with each other,
The star roller is pressed radially inward, and the release mechanism is configured to connect the internal ring and the planet
The roller is pulled apart in the axial direction, and the action point that is a part of the outer peripheral edge of the internal ring is
The housing is displaced in a direction away from the planetary roller, and the housing moves the release mechanism.
During operation, the fulcrum, which is a part different from the action point on the outer peripheral edge of the internal ring, contacts
A fulcrum contact portion that moves around the fulcrum during operation of the release mechanism.
The internal ring is inclined from a plane orthogonal to the rotation axis.

  According to the first exemplary invention of the present application, when it is desired to rotate the wheel with an external force, the planetary roller and the internal ring are separated by the release mechanism. Thereby, a part of the speed reduction mechanism can be separated with a slight displacement, and the external force necessary for the rotation of the wheel can be reduced.

FIG. 1 is a longitudinal sectional view of a wheel unit according to the first embodiment. FIG. 2 is a view of the sun roller, the plurality of planetary rollers, the internal ring, and the housing as viewed from the position AA in FIG. FIG. 3 is a partial cross-sectional view of the wheel-in speed reducer. FIG. 4 is a longitudinal sectional view of the wheel unit when the operating rod is protruded. FIG. 5 is a view showing an example in which a cam is used for the release mechanism. FIG. 6 is a view showing an example in which a cam is used in the release mechanism.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, the direction parallel to the rotation axis of the sun roller is “axial direction”, the direction orthogonal to the rotation axis is “radial direction”, and the direction along the arc centering on the rotation axis is “circumferential direction”. Called. However, the above “parallel direction” includes a substantially parallel direction. In addition, the above-mentioned “orthogonal direction” includes a substantially orthogonal direction. In the following, for convenience of explanation, the right side (one side in the axial direction) in FIG. 1 is referred to as “input side”, and the left side in FIG. 1 (the other side in the axial direction) is referred to as “output side”.

<1. First Embodiment>
FIG. 1 is a longitudinal sectional view of a wheel unit 1 including a wheel-in speed reducing device 300 according to the first embodiment of the present invention. The wheel unit 1 is a unit that rotates the wheel 70 by converting the rotational motion of the first rotational speed obtained from the motor 100 into the rotational motion of the second rotational speed lower than the first rotational speed. The wheel unit 1 is used by being incorporated in a wheel of a wheelchair, an automatic guided vehicle, an electric standing and riding two-wheeled vehicle, an electric walking assist car, a chair-type electric vehicle, an electric vehicle, or the like. However, the wheel-in speed reducer and wheel unit of the present invention may be used for other purposes.

  As shown in FIG. 1, the wheel unit 1 of the present embodiment includes a motor 100, a mounting plate 200, and a wheel-in speed reducer 300.

  The motor 100 is an electric motor serving as a power source for the wheel unit 1. As shown in FIG. 1, the motor 100 includes a motor casing 101 and a shaft 102. Inside the motor casing 101, a stator having a plurality of coils and a rotor having a magnet are provided. The shaft 102 is disposed along the rotation shaft 9, and an output side end portion thereof protrudes from the motor casing 101. When the coil is energized, the rotor and the shaft 102 rotate around the rotating shaft 9 by the magnetic force generated between the stator and the rotor.

  The attachment plate 200 is a plate-like member for attaching the wheel-in reduction device 300 to the motor 100. The mounting plate 200 is disposed substantially perpendicular to the rotation shaft 9. The mounting plate 200 is fixed to the motor casing 101 in the vicinity of the radially inner end. In the example of FIG. 1, a mounting plate 200 is screwed to the output side surface of the motor casing 101. However, the method of fixing the mounting plate 200 to the motor casing 101 may be a method other than screwing. Further, the mounting plate 200 is fixed to the housing 50 described later in the vicinity of the radially outer end. Thereby, the motor casing 101 and the housing 50 are arrange | positioned coaxially.

  The wheel-in speed reducing device 300 is a device that transmits the rotational motion of the shaft 102 to the wheel 70 while decelerating. The wheel-in speed reduction device 300 uses a so-called traction type planetary speed reduction mechanism that transmits power by rotating the surface of the sun roller 10 and the surfaces of the plurality of planetary rollers 20 while being in contact with each other. . As shown in FIG. 1, the wheel-in speed reduction device 300 of this embodiment includes one sun roller 10, a plurality of planetary rollers 20, an internal ring 30, a pressure mechanism 40, a housing 50, a plurality of carrier pins 60, and a wheel. 70 and a release mechanism 80.

  FIG. 2 is a view of the sun roller 10, the plurality of planetary rollers 20, the internal ring 30, and the housing 50 as viewed from the position AA in FIG. 1. FIG. 3 is a partial cross-sectional view of the wheel-in speed reducing device 300 including the planetary roller 20, the internal ring 30, the pressure mechanism 40, the housing 50, and the release mechanism 80. Hereinafter, the details of the wheel-in speed reducing device 300 will be described with reference to FIGS. 1 to 3.

  The sun roller 10 is a cylindrical member arranged coaxially with the rotation shaft 9. The shaft 102 of the motor 100 is press-fitted into the center circular hole of the sun roller 10. Thereby, the sun roller 10 is fixed to the outer peripheral surface of the shaft 102. When the motor 100 is driven, the sun roller 10 as well as the shaft 102 rotates at the first rotation speed around the rotation shaft 9.

  The plurality of planetary rollers 20 are disk-shaped members arranged around the sun roller 10. As shown in FIG. 2, in this embodiment, three planetary rollers 20 are arranged at equal intervals around the sun roller 10. However, the number of planetary rollers 20 included in the wheel-in speed reduction device 300 may be two, or may be four or more. Each planetary roller 20 has a pin hole 21 in the center. A carrier pin 60 described later is inserted into the pin hole 21. Each planetary roller 20 is rotatably supported by the carrier pin 60.

  As shown in FIGS. 1 and 3, the planetary roller 20 of the present embodiment includes an annular thick part 22 that surrounds the pin hole 21, an annular thin part 23 that surrounds the outer side of the thick part 22, and Have The thickness of the thin portion 23 in the axial direction is thinner than the thickness of the thick portion 22 in the axial direction. The outer peripheral surface of the thin portion 23 is a large-diameter surface 24 that contacts the outer peripheral surface of the sun roller 10. A small-diameter surface 25 that is a pair of inclined surfaces that come into contact with an internal ring 30 described later is provided at the boundary between the thick portion 22 and the thin portion 23. Each small-diameter surface 25 is inclined so that the diameter decreases as the distance from the thin portion 23 increases in the axial direction.

  Thus, the planetary roller 20 of the present embodiment contacts the sun roller 10 and the internal ring 30 on different surfaces. The surface that contacts the internal ring 30 is closer to the carrier pin 60 than the surface that contacts the sun roller 10. If it does in this way, the revolution speed of the planetary roller 20 along the internal ring 30 will become slow. As a result, the reduction ratio of the wheel-in reduction device 300 can be increased as compared with the case where the same surface of the planetary roller is in contact with the sun roller and the internal ring.

  The internal ring 30 includes a first ring member 31 disposed on the input side of the thin portion 23 and a second ring member 32 disposed on the output side of the thin portion 23. Each of the first ring member 31 and the second ring member 32 is an annular member centered on the rotation shaft 9. As shown in FIG. 3, an annular first pressure surface 311 is provided on the inner peripheral portion of the first ring member 31. The first pressure surface 311 is curved so as to face the small-diameter surface 25 on the input side of the planetary roller 20 and protrude toward the small-diameter surface 25. Further, an annular second pressure surface 321 is provided on the inner peripheral portion of the second ring member 32. The second pressure surface 321 is curved to face the small-diameter surface 25 on the output side of the planetary roller 20 and to protrude toward the small-diameter surface 25. The pair of small diameter surfaces 25 of each planetary roller 20 are in contact with the first pressure surface 311 and the second pressure surface 321, respectively.

  The pressurizing mechanism 40 is a mechanism that pressurizes the internal ring 30 toward the output side. The pressurizing mechanism 40 of the present embodiment has a plurality of coil springs 41. The plurality of coil springs 41 are arranged at equal intervals in the circumferential direction between the first ring member 31 and the mounting plate 200. Each coil spring 41 is compressed in the axial direction rather than the natural length. For this reason, the first ring member 31 is pressurized toward the output side along the axial direction by the repulsive force of the coil spring 41.

  When the first ring member 31 is pressurized toward the output side, the planetary roller 20 is sandwiched between the first pressure surface 311 of the first ring member 31 and the second pressure surface 321 of the second ring member 32. The first pressure surface 311 presses the small diameter surface 25 on the input side of the planetary roller 20, and the second pressure surface 321 presses the small diameter surface 25 on the output side of the planetary roller 20. Thereby, the planetary roller 20 is pressurized radially inward. As a result, the planetary roller 20 and the sun roller 10 are maintained in contact with each other.

  As described above, in the present embodiment, the axial pressing force by the pressurizing mechanism 40 is converted into the pressing force inward in the radial direction via the small diameter surface 25 inclined with respect to the rotating shaft 9. The pressurizing mechanism 40 may generate only the pressing force toward the output side (that is, the pressing force in one direction), not the pressing force toward the inner side in the radial direction (that is, pressing force in a plurality of directions). For this reason, the structure of the pressurization mechanism 40 can be simplified. In addition, instead of the coil spring 41, another elastic member such as a leaf spring may be used for the pressurizing mechanism 40.

  With the above configuration, the plurality of planetary rollers 20 are always in contact with both the sun roller 10 and the internal ring 30. For this reason, when the sun roller 10 rotates, the plurality of planetary rollers 20 receives power from the sun roller 10 and rotates by friction with the sun roller 10. The plurality of planetary rollers 20 revolve around the rotating shaft 9 along the internal ring 30 due to friction with the internal ring 30. At this time, the revolution speed of the planetary roller 20 is a second rotational speed lower than the first rotational speed.

  The housing 50 is a substantially cylindrical member that surrounds the plurality of planetary rollers 20, the internal ring 30, and a bearing 73 described later. The housing 50 of this embodiment includes a large diameter portion 51 and a small diameter portion 52 that is located on the output side of the large diameter portion 51 and has a smaller diameter than the large diameter portion 51. The large diameter portion 51 is located on the radially outer side of the plurality of planetary rollers 20 and the internal ring 30. The small diameter part 52 is located on the radially outer side of a bearing part 73 described later. The housing 50 is fixed to the mounting plate 200 at the input side end of the large diameter portion 51.

  As shown in FIG. 1, a fulcrum contact portion 53 is provided on the inner peripheral surface of the large diameter portion 51. During the operation of the release mechanism 80 described later, a fulcrum 312 that is a part of the outer peripheral edge of the first ring member 31 contacts the fulcrum contact portion 53. Then, the first ring member 31 is inclined with the fulcrum 312 as the center. However, a slight gap is interposed between the fulcrum 312 of the first ring member 31 and the fulcrum contact portion 53 when the release mechanism 80 described later is not operating. For this reason, the first ring member 31 contacts the plurality of planetary rollers 20 without being blocked by the fulcrum contact portion 53.

  The plurality of carrier pins 60 rotatably support the plurality of planetary rollers 20. Each carrier pin 60 is a cylindrical member and is disposed in parallel with the rotation shaft 9. The end of each carrier pin 60 on the input side is inserted into the pin hole 21 of the planetary roller 20. Further, the output side end of each carrier pin 60 is fixed to a first wheel member 71 described later by press-fitting or the like.

  The wheel 70 includes a first wheel member 71 and a second wheel member 72. The first wheel member 71 is a circular member that forms the central portion of the wheel 70 when viewed in the axial direction. The first wheel member 71 is located on the output side of the sun roller 10 and the plurality of planetary rollers 20 and on the radially inner side of the housing 50. A plurality of carrier pins 60 are respectively fixed to the input side surface of the first wheel member 71. A circular recess 711 is provided on the output side surface of the first wheel member 71. Thereby, the wheel 70 of this embodiment is reduced in weight compared with the case where the recessed part 711 is not provided.

  The second wheel member 72 is an annular member located on the radially outer side of the first wheel member 71. The second wheel member 72 has an annular plate part 721 and an outer cylinder part 722. The annular plate portion 721 extends annularly around the first wheel member 71. An edge on the radially inner side of the annular plate portion 721 is fixed to the first wheel member 71 by, for example, bolting or the like. The outer cylinder part 722 extends in a cylindrical shape from the radially outer end of the annular plate part 721 toward the input side. The outer cylinder portion 722 is located on the outer side in the radial direction than the housing 50.

  When the wheel unit 1 is used, for example, a rubber tire is attached to the outer peripheral surface of the outer cylinder portion 722. In that case, the outer peripheral surface of the tire attached to the wheel 70 becomes a ground contact surface. However, the tire may be omitted and the outer peripheral surface of the outer cylinder portion 722 may be brought into direct contact with the ground. The wheel 70 may be used as a hub that connects a plurality of spokes at the center of the wheel.

  A bearing portion 73 is interposed between the housing 50 and the wheel 70. In the present embodiment, a cross roller bearing as the bearing portion 73 is disposed between the inner peripheral surface of the small diameter portion 52 of the housing 50 and the cylindrical outer peripheral surface of the first wheel member 71. However, instead of the cross roller bearing, other types of bearings such as a ball bearing and a roller bearing may be used.

  When the plurality of planetary rollers 20 revolve at the second rotation speed after deceleration, the plurality of carrier pins 60 also rotate at the second rotation speed around the rotation shaft 9. When the plurality of carrier pins 60 are rotated, the wheel 70 fixed to the carrier pins 60 is also rotated at the second rotation speed around the rotation shaft 9. Thereby, a wheel is driven.

  The release mechanism 80 is a mechanism that pulls the internal ring 30 away from the planetary roller 20. The release mechanism 80 is operated when it becomes impossible to drive the motor 100 due to, for example, the battery running out and the wheel 70 needs to be manually rotated. As shown in FIGS. 1 and 3, the release mechanism 80 of this embodiment includes a hook screw 81, a nut 82, a wire 83, a plurality of pulleys 84, an operating rod 85, and a toggle clamp mechanism 86.

  The hook screw 81 is inserted from the input side into an action point 313 that is a part different from the fulcrum 312 described above on the outer peripheral edge of the first ring member 31. The nut 82 is attached to the tip of the hook screw 81 that protrudes to the output side of the first ring member 31. This prevents the hook screw 81 from coming off to the output side. One end of the wire 83 is fixed to the hook screw 81. The wire 83 is pulled out from the hook screw 81 to the input side of the mounting plate 200, and the other end is fixed to the mounting plate 200 via the plurality of pulleys 84.

  The operating rod 85 is arranged so that the tip portion faces the wire 83 that is spanned between the plurality of pulleys 84. During normal driving of the wheel-in speed reducer 300, the operating rod 85 is disposed at a retracted position (a position in FIGS. 1 and 3) where the wire 83 is not pressed. In this state, the length of the wire 83 extending to the output side from the mounting plate 200 becomes longer. Therefore, the first ring member 31 comes into contact with the plurality of planetary rollers 20 by the pressure of the coil spring 41.

  On the other hand, when it is desired to rotate the wheel 70 with an external force, the lever 861 of the toggle clamp mechanism 86 is operated to cause the operating rod 85 to protrude. FIG. 4 is a longitudinal sectional view of the wheel unit 1 when the operating rod 85 is protruded. As shown in FIG. 4, when the operating rod 85 is protruded, the length of the wire 83 extending to the output side from the mounting plate 200 is shortened. For this reason, the action point 313 of the first ring member 31 is displaced to the input side against the pressure of the coil spring 41. As a result, the plurality of planetary rollers 20 and the first ring member 31 are pulled apart in the axial direction.

  At this time, the fulcrum 312 of the first ring member 31 contacts the fulcrum contact portion 53. Then, the first ring member 31 is inclined from the plane orthogonal to the rotation axis 9 with the fulcrum 312 as the center. If it does in this way, the 1st ring member 31 can be pulled away from all the planetary rollers 20 only by displacing a part of the perimeter edge of the 1st ring member 31.

  As described above, in the wheel-in speed reducing device 300, the first ring member 31 can be separated from the plurality of planetary rollers 20 by the release mechanism 80 when the wheel 70 is to be rotated by an external force. Thereby, a part of the speed reduction mechanism is separated. Therefore, the external force required for the rotation of the wheel 70 can be reduced. Further, the contact portion between the planetary roller 20 and the first ring member 31 is not in meshing between the gears, but in contact between the surfaces without unevenness. For this reason, the planetary roller 20 and the first ring member 31 can be separated only by slightly displacing the first ring member 31.

  The configuration of the release mechanism 80 does not necessarily have the same structure as that of the present embodiment. However, as in this embodiment, if both the direction of pressing the first ring member 31 by the pressurizing mechanism 40 and the direction of displacement of the first ring member 31 by the release mechanism 80 are axial directions, The structures of the pressure mechanism 40 and the release mechanism 80 can be easily simplified.

  The plurality of pulleys 84 and the toggle clamp mechanism 86 of the release mechanism 80 are attached to the housing 50. Further, when the toggle clamp mechanism 86 is operated, the operation rod 85 that is a movable portion is displaced relative to the housing 50. That is, the position of the operating rod 85 is switched between two stationary positions. The toggle clamp mechanism 86 can stabilize the operation rod 85 stably even when the operation rod 85 is switched to either the stationary position shown in FIG. 1 or FIG. 4. For this reason, the first ring member 31 can be maintained in either a state in contact with the planetary roller 20 or a state in which the first ring member 31 is separated from the planetary roller 20 without continuously applying power to the operation rod 85.

<2. Modification>
As mentioned above, although exemplary embodiment of this invention was described, this invention is not limited to said embodiment.

  5 and 6 are diagrams showing an example in which a cam 87A is used for the release mechanism 80A. The shape of the cam 87A in plan view is also shown at the top of each of FIGS. In this modification, a cam 87A is arranged between the action point 313A of the first ring member 31A and the second ring member 32A. The cam 87A has a major axis 871A and a minor axis 872A, and is rotatable about a pivot shaft 870A extending in the radial direction.

  During normal driving of the wheel-in speed reducing device 300A, as shown in FIG. 5, the cam 87A is arranged so that the short diameter 872A faces the axial direction. In this state, both the first ring member 31A and the second ring member 32A do not contact the cam 87A. For this reason, the first ring member 31A and the second ring member 32A are in contact with the planetary roller 20A without being blocked by the cam 87A.

  On the other hand, when it is desired to rotate the wheel with an external force, the cam 87A is rotated 90 degrees about the rotation shaft 870A. The rotation of the cam 87A may be realized, for example, by operating a lever (not shown) connected to the cam 87A. Thereby, as shown in FIG. 6, the cam 87A is arranged so that the major axis 871A faces the axial direction. Then, both ends of the major axis 871A of the cam 87A come into contact with the first ring member 31A and the second ring member 32A, and the axial distance between both members is increased. In the example of FIG. 6, the action point 313A of the first ring member 31A is displaced to the input side against the pressure of the coil spring 41A. As a result, the first ring member 31A is inclined, and the plurality of planetary rollers 20A and the first ring member 31A are separated. Thereby, the external force required for rotation of a wheel can be reduced.

  In addition to the first embodiment described above and the examples of FIGS. 5 to 6, the first ring member may be separated from the planetary roller by using a link mechanism combined with a rigid member. Further, the first ring member may be displaced toward the input side without being inclined. In the first embodiment and the examples of FIGS. 5 to 6, the release mechanism is operated by manually operating the lever. However, the release mechanism may be operated using power such as a motor.

  In the first embodiment and the examples of FIGS. 5 to 6, the planetary roller and the internal ring are separated by displacing the first ring member. However, the planetary roller and the internal ring may be separated by displacing the second ring member or the planetary roller.

  In the first embodiment, the inclined surfaces of the planetary roller and the internal ring are brought into contact with each other. However, in the planetary roller and the internal ring, it is only necessary that one of the surfaces in contact with each other is an inclined surface. Then, the inclined surface provided on one of the planetary roller and the internal ring may be brought into contact with the other of the planetary roller and the internal ring.

  Moreover, in said 1st Embodiment, the wheel was formed with two members. However, the wheel may be formed of a single member.

  In the first embodiment, the planetary roller is in contact with the sun roller and the internal ring on different surfaces. However, the wheel-in speed reducer of the present invention may have a structure in which the same surface of the planetary roller contacts the sun roller and the internal ring.

  For example, a high-strength metal may be used as the material of each member constituting the wheel-in speed reducer. However, the material of each member is not limited to metal as long as it can withstand the load during use.

  Moreover, about the detailed shape of a wheel-in speed reducer and a wheel unit, you may differ from the shape shown by each figure of this application. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

  The present invention can be used for a wheel-in speed reducer and a wheel unit.

DESCRIPTION OF SYMBOLS 1 Wheel unit 9 Rotating shaft 10 Sun roller 20, 20A Planetary roller 21 Pin hole 22 Thick part 23 Thin part 24 Large diameter surface 25 Small diameter surface 30 Internal ring 31, 31A First ring member 32, 32A Second ring member 40 Pressure mechanism 50 Housing 51 Large diameter part 52 Small diameter part 53 Support point contact part 60 Carrier pin 70 Wheel 71 First wheel member 72 Second wheel member 73 Bearing part 80, 80A Release mechanism 81 Hook screw 82 Nut 83 Wire 84 Pulley 85 Control rod 86 Toggle clamp mechanism 87A Cam 100 Motor 101 Motor casing 102 Shaft 200 Mounting plate 300, 300A Wheel-in speed reducer 311 First pressure surface 312 Support point 313, 313A Action point 321 Second pressure surface 861 Lever

Claims (6)

A sun roller that rotates about a rotation axis;
A plurality of planetary rollers disposed around the sun roller;
An annular internal ring that contacts the plurality of planetary rollers;
A housing surrounding the internal ring;
A plurality of carrier pins rotatably supporting each of the plurality of planetary rollers;
A wheel fixed to ends of the plurality of carrier pins;
A pressure mechanism for pressing the internal ring toward the planetary roller;
Have
The plurality of planetary rollers revolve around the rotation axis while rotating by receiving power from the sun roller while being in contact with both the sun roller and the internal ring, respectively. Because
A release mechanism for separating the internal ring and the planetary roller ;
At least one of the planetary roller and the internal ring has an inclined surface that is inclined with respect to the rotation axis,
The pressurizing mechanism presses the internal ring in the axial direction, thereby
And the other of the planetary roller and the internal ring are in contact with each other,
Press the star roller radially inward,
The release mechanism separates the internal ring and the planetary roller in the axial direction.
, Displacing an action point that is a part of the outer peripheral edge of the internal ring in a direction away from the planetary roller,
The housing is disposed in front of the outer peripheral edge of the internal ring during operation of the release mechanism.
A fulcrum contact portion with which a fulcrum that is a part different from the point of action contacts,
During operation of the release mechanism, the internal ring is centered around the fulcrum.
A wheel-in speed reducer that tilts from a plane perpendicular to the rotational axis . The wheel-in speed reducer according to claim 1,
The internal ring is
A first ring member located on one side of the planetary roller in the axial direction;
A second ring member located on the other side in the axial direction of the planetary roller;
Have
The pressurizing mechanism presses the first ring member in the axial direction toward the planetary roller.
Accordingly, the planetary roller is sandwiched between the first ring member and the second ring member.
A wheel-in speed reducer that pressurizes the planetary roller radially inward. The wheel-in speed reducer according to claim 1 or 2,
The planetary roller is
A large diameter surface in contact with the outer peripheral surface of the sun roller;
A small diameter surface closer to the carrier pin than the large diameter surface;
Have
A wheel-in speed reducer in which the small diameter surface becomes the inclined surface. The wheel-in speed reducer according to claim 1 ,
A wheel-in speed reducer in which a gap is interposed between the fulcrum of the internal ring and the fulcrum contact portion when the release mechanism is not operating. The wheel-in speed reducer according to any one of claims 1 to 4 ,
The release mechanism is
A movable part that moves relative to the housing;
A toggle clamp mechanism for switching the position of the movable part between two stationary positions that are stably stationary;
Have
A wheel-in reduction device in which the internal ring is displaced in accordance with the displacement of the movable part. The wheel-in speed reducer according to any one of claims 1 to 5 ,
A motor for rotating the sun roller;
Having a wheel unit.

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