JP2019090429A - Clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a clutch device. A clutch device 100 includes a clutch housing 2, first and second pressing members 3, 4, and a cam mechanism 8. The clutch housing 2 has tapered first and second pressure receiving surfaces 221 and 222. The first pressing member 3 has a tapered first pressing surface 311. The first pressing member 3 is movable in the axial direction. The second pressing member 4 has a tapered second pressing surface 411. The second pressing member 4 is connected to the output side member. The cam mechanism 8 converts the relative rotation of the first pressing member 3 with respect to the second pressing member 4 into axial movement of the first pressing member 3 so that the first pressing surface 311 approaches the first pressure receiving surface 221. [Selection diagram] Fig. 1

Description

  The present invention relates to a clutch device.

  In general, in a motorcycle, a clutch device is used to transmit or disconnect torque from an engine to a transmission. The clutch device has a clutch housing, a rotating body, and a clutch portion. The clutch housing is connected to the crankshaft side of the engine, and the rotating body is connected to the transmission side. The clutch portion transmits or cuts off torque by frictional engagement or disengagement between the clutch housing and the rotating body. The clutch portion has a plurality of drive plates and a plurality of driven plates in order to improve the frictional force.

JP, 2013-185675, A

  As shown in Patent Document 1, the conventional clutch device for a motorcycle improves the frictional force by increasing the drive plate and the driven plate. However, increasing the number of drive plates and driven plates causes an increase in cost.

  An object of the present invention is to reduce the cost of a clutch device.

  The clutch device according to an aspect of the present invention is configured to transmit the power from the drive source to the output side member and to rotate in the first direction. The clutch device includes a clutch housing, a first pressing member, a second pressing member, and a cam mechanism. The clutch housing receives power from the drive source. The clutch housing has a tapered first pressure receiving surface facing the first axial direction and a tapered second pressure receiving surface facing the second axial direction. The first pressing member has a tapered first pressing surface for pressing the first pressure receiving surface. The first pressing member is movable in the axial direction. The second pressing member has a tapered second pressing surface for pressing the second pressure receiving surface. The second pressing member is coupled to the output side member. The cam mechanism converts the relative rotation of the first pressing member relative to the second pressing member into axial movement of the first pressing member such that the first pressing surface approaches the first pressure receiving surface.

  According to this configuration, the first and second pressing surfaces and the first and second pressure receiving surfaces are tapered. When the pressure receiving surfaces and the pressing surfaces frictionally engage with each other via the friction material, a stronger frictional force acts on the pressure receiving surfaces and the pressing surfaces according to the principle of the wedge. As a result, sufficient friction can be obtained even if the number of friction materials is reduced, and as a result, cost can be reduced as compared with the conventional multi-plate clutch device.

  Further, since the cam mechanism is provided, the frictional force between the first pressing surface and the first pressure receiving surface can be improved. As a result, for example, when using a coil spring for clutch connection, the load of the spring can be reduced.

  Preferably, the cam mechanism moves the first pressing member in the axial direction so that the first pressing surface approaches the first pressure receiving surface when the first pressing member is relatively rotated in the first direction with respect to the second pressing member. Let

  Preferably, when the first pressing member is relatively rotated in a second direction opposite to the first direction with respect to the second pressing member, the cam mechanism causes the first pressing surface to approach the first pressure receiving surface. 1) The pressing member is moved in the axial direction.

  Preferably, when the first pressing member relatively rotates in the first direction with respect to the second pressing member, the cam mechanism causes the first pressing member to approach the first pressure receiving surface in the axial direction. Move to The cam mechanism causes the first pressing surface to move away from the first pressure receiving surface when the first pressing member rotates relative to the second pressing member in the second direction opposite to the first direction. The member is moved axially.

  Preferably, the cam mechanism is constituted by an inclined surface formed on each of the first and second pressing members.

  Preferably, the second pressing member has a plurality of through holes arranged at intervals in the circumferential direction. The first pressing member has a plurality of protrusions extending in the axial direction via the respective through holes. The cam mechanism is constituted by the inner wall surface of the through hole and the outer peripheral surface of the projecting portion.

  Preferably, the clutch device further includes a release member having a plurality of circumferentially spaced projections. The protrusion is then attached to the protrusion.

  Preferably, the clutch device further includes a release member having a plurality of circumferentially spaced projections. And a 2nd press member has the through-hole arrange | positioned at intervals in the circumferential direction. The projection is attached to the first pressing member via the through hole. The cam mechanism is constituted by the inner wall surface of the through hole and the outer peripheral surface of the projection.

Preferably, the first pressing member has a plurality of through holes circumferentially spaced apart. The second pressing member has a protrusion extending in the axial direction via the through hole.
The cam mechanism is constituted by the inner wall surface of the through hole and the outer peripheral surface of the protrusion.

  According to the present invention, the cost of the clutch device can be reduced.

Sectional drawing of a clutch apparatus. The front view of a clutch apparatus. Schematic which shows a cam mechanism. Schematic which shows the cam mechanism which concerns on a modification. Schematic which shows the cam mechanism which concerns on a modification. Schematic which shows the cam mechanism which concerns on a modification. Schematic which shows the cam mechanism which concerns on a modification. Schematic of the clutch apparatus which concerns on a modification.

  FIG. 1 is a cross-sectional view of a clutch device, and FIG. 2 is a front partial view of the clutch device. In the following description, the axial direction means the direction in which the rotation axis O of the clutch device extends. In the present embodiment, the axial direction is the left-right direction in FIG. In the following description, the inside in the axial direction means the left side of FIG. 1, and the outside in the axial direction means the right side of FIG. Further, the circumferential direction refers to the circumferential direction of a circle centered on the rotation axis O, and the radial direction refers to the radial direction of a circle centered on the rotation axis O.

[overall structure]
The clutch device 100 is configured to transmit power from an engine (an example of a drive source) to a transmission, and to cut off power transmission by operation of a release mechanism. The clutch device 100 includes a clutch housing 2, a first pressing member 3, a second pressing member 4, a release member 5, a plurality of biasing members 6, and a cam mechanism 8. The clutch device 100 is a motorcycle clutch device.

[Clutch housing 2]
The clutch housing 2 receives power from the engine. The clutch housing 2 has a housing body 21 and a clutch shoe 22. The clutch housing 2 is attached to the input gear 7. The input gear 7 meshes with a drive gear (not shown) fixed to a crankshaft on the engine side, and receives power from the engine.

  The housing main body portion 21 has a disc portion 211 and a cylindrical portion 212. The disc portion 211 and the cylindrical portion 212 are formed by one member. The disc portion 211 is attached to the input gear 7.

  The cylindrical portion 212 is formed so as to extend axially outward from the outer peripheral edge portion of the disc portion 211. In the cylindrical portion 212, a plurality of notches 212a extending in the axial direction and opening outward in the axial direction are formed at intervals in the circumferential direction.

  The clutch shoe 22 is an annular member, and is disposed along the inner peripheral surface of the cylindrical portion 212 of the clutch housing 2. The clutch shoe 22 has a plurality of claws 223 spaced apart in the circumferential direction.

  As shown in FIG. 2, the plurality of claws 223 are formed to project radially outward. The plurality of claws 223 are arranged at intervals in the circumferential direction. Each claw 223 is engaged with a notch 212 a formed in the cylindrical portion 212. Thus, the clutch shoe 22 can move in the axial direction with respect to the housing body 21 and can not rotate.

  As shown in FIG. 1, the clutch shoe 22 has a first clutch shoe 22a and a second clutch shoe 22b. The first clutch shoe 22a and the second clutch shoe 22b are annular. The first clutch shoe 22a and the second clutch shoe 22b are arranged in the axial direction. The first clutch shoe 22a is disposed axially inward of the second clutch shoe 22b.

  The first clutch shoe 22 a has a first pressure receiving surface 221, and the second clutch shoe 22 b has a second pressure receiving surface 222. The first pressure receiving surface 221 is an inner circumferential surface of the first clutch shoe 22a, and the second pressure receiving surface 222 is an inner circumferential surface of the second clutch type 22b.

  The first pressure receiving surface 221 is tapered. The first pressure receiving surface 221 faces inward in the axial direction and also faces inward in the radial direction. That is, the first pressure receiving surface 221 is formed in a tapered shape in which the diameter increases from the axially outer side toward the axially inner side. In the present embodiment, the inner side in the axial direction corresponds to the first side in the axial direction of the present invention.

  The second pressure receiving surface 222 is tapered. The second pressure receiving surface 222 faces axially outward and radially inward. That is, the second pressure receiving surface 222 is formed in a tapered shape in which the diameter increases from the inner side in the axial direction toward the outer side in the axial direction. The second pressure receiving surface 222 is opposite to the first pressure receiving surface 221 in the axial direction. In the present embodiment, the outer side in the axial direction corresponds to the second side in the axial direction of the present invention.

[First pressing member]
The first pressing member 3 is disposed radially inward of the clutch shoe 22. The first pressing member 3 is disposed to be movable in the axial direction. The first pressing member 3 has a first pressing portion 31, a disc portion 32, and a plurality of projecting portions 33. The first pressing portion 31, the disc portion 32, and the respective projecting portions 33 are configured by one member.

  The first pressing portion 31 is disposed at the outer peripheral end of the disc portion 32. The first pressing portion 31 has a first pressing surface 311. The first pressing surface 311 constitutes an outer peripheral surface of the first pressing member 3. The first pressing surface 311 presses the first pressure receiving surface 221 via the friction material 312. The friction material 312 is fixed to the first pressing surface 311, but may be fixed to the first pressure receiving surface 221.

  The first pressing surface 311 has a shape along the first pressure receiving surface 221. Specifically, the first pressing surface 311 is tapered. The first pressing surface 311 faces axially outward and also faces radially outward. That is, the first pressing surface 311 is formed in a tapered shape in which the diameter increases from the axially outer side toward the axially inner side.

  The disc portion 32 has a through hole 321 at the center. Bosses 43 described later extend inward in the axial direction via the through holes 321. The disk portion 32 has an annular groove 322. The groove portion 322 is formed on the outer surface in the axial direction of the disc portion 32.

  The respective projecting portions 33 are arranged at intervals in the circumferential direction at the inner peripheral end of the disc portion 32. Each protrusion 33 extends axially outward from the inner peripheral end of the disc portion 32. An engagement protrusion 331 is formed at the outer peripheral end of the tip end surface of each protrusion 33.

[Second pressing member]
The second pressing member 4 is disposed radially inward of the clutch shoe 22. The second pressing member 4 is configured to be connected to an output side member, for example, an input shaft (not shown) of a transmission. The second pressing member 4 is arranged so as not to move in the axial direction. The second pressing member 4 is rotatable relative to the first pressing member 3.

  The second pressing member 4 has a second pressing portion 41, a disc portion 42, and a boss portion 43. The 2nd press part 41, the disc part 42, and the boss | hub part 43 are comprised by one member.

  The second pressing portion 41 is disposed at the outer peripheral end of the disc portion 42. The second pressing portion 41 has a second pressing surface 411. The second pressing surface 411 constitutes an outer peripheral surface of the second pressing member 4. The second pressing surface 411 presses the second pressure receiving surface 222 via the friction material 412. The friction material 412 is fixed to the second pressing surface 411, but may be fixed to the second pressure receiving surface 222.

  The second pressing surface 411 has a shape along the second pressure receiving surface 222. Specifically, the second pressing surface 411 is tapered. The second pressing surface 411 faces inward in the axial direction and also faces outward in the radial direction. That is, the second pressing surface 411 is formed in a tapered shape in which the diameter decreases in the axial direction from the outer side in the axial direction.

  The disc portion 42 has a plurality of through holes 422. The through holes 422 are spaced apart in the circumferential direction. The protrusions 33 of the first pressing member 3 pass through the through holes 422. The disk portion 42 is disposed axially inward of the second pressing portion 41. Specifically, the axially inner side surface of the disc portion 42 is disposed axially inward of the axially inner end of the second pressing surface 411. Further, the axially inner side surface of the disc portion 42 is disposed axially inward of the axially outer end of the first pressing surface 311.

  The boss portion 43 extends axially inward from the disc portion 42. The boss portion 43 has a spline hole 431 at its central portion. For example, an input shaft (not shown) of the transmission is spline fitted to the spline hole 431. The spline holes 431 extend in the axial direction, and also penetrate the disc portion 42.

  In the configuration as described above, the first clutch C1 is configured by the first pressure receiving surface 221 of the clutch shoe 22 and the friction member 312 fixed to the first pressing surface 311 of the first pressing member 3. Further, a second clutch C2 is configured by the second pressure receiving surface 222 of the clutch shoe 22 and the friction material 412 fixed to the second pressing surface 411 of the second pressing member 4.

[Release member]
The release member 5 is axially moved by a release mechanism (not shown). The release member 5 is axially movable integrally with the first pressing member 3. The release member 5 is disposed axially outside the second pressing member 4. In the present embodiment, the housing 2, the first pressing member 3, the second pressing member 4, and the release member 5 are arranged in this order from the inside in the axial direction.

  The release member 5 has an annular main body 51 and a plurality of projections 52. The rod or the like of the release mechanism can penetrate through the annular main body 51. The protrusion 52 extends axially inward from the outer peripheral end of the main body 51. The protrusion 52 is formed of the main body 51 and one member. The plurality of protrusions 52 are spaced apart from one another in the circumferential direction.

  The protrusion 52 is attached to the protrusion 33 of the first pressing member 3. Specifically, the tip end surface of the protrusion 52 is in contact with the tip end surface of the protrusion 33. The protrusion 52 has an engagement groove 521 at the outer peripheral end of the tip end surface. The engagement projection 331 of the projection 33 of the first pressing member 3 described above is engaged with the engagement groove 521.

  The protrusion 52 has a through hole 522 penetrating in the axial direction. And the protrusion part 33 of the 1st press member 3 has the screw hole 332 opened to the axial direction outer side. A bolt 53 extending inward in the axial direction through the through hole 522 of the projection 52 is screwed into the screw hole 332 of the projection 33. Thus, the release member 5 is fixed to the first pressing member 3.

[Biasing member]
The biasing member 6 biases the first pressing member 3 so that the first pressing surface 311 of the first pressing member 3 presses the first pressure receiving surface 221. In detail, the biasing member 6 is a coil spring. And, it is installed in a compressed state between the second pressing member 4 and the release member 5. Since the second pressing member 4 can not move in the axial direction, the biasing member 6 biases the release member 5 outward in the axial direction. Since the release member 5 axially moves integrally with the first pressing member 3, the biasing member 6 indirectly biases the first pressing member 3 by biasing the release member 5. .

  The biasing member 6 is disposed between the protrusions 52 of the release member 5 in the circumferential direction. The biasing member 6 may be arranged to surround the protrusion 52 of the release member 5. That is, the protrusion 52 may penetrate through the inside of the biasing member 6.

[Cam mechanism]
The cam mechanism 8 is configured to convert relative rotation of the first pressing member 3 with respect to the second pressing member 4 into movement of the first pressing member 3 in the axial direction. Specifically, the first pressing member 3 is moved axially outward by the cam mechanism 8 so that the first pressing surface 311 approaches the first pressure receiving surface 221.

  As shown in FIG. 3, each cam mechanism 8 has a first cam portion 81 and a second cam portion 82. The first cam portion 81 is configured of a first inclined surface 811 formed on the first pressing member 3 and a second inclined surface 812 formed on the second pressing member 4.

  The first inclined surface 811 is configured by a part of the outer peripheral surface of the protrusion 33 of the first pressing member 3. In detail, the first inclined surface 811 is configured by a surface of the outer peripheral surface of the projecting portion 33 that faces in the first direction. The first direction is the direction in which the clutch device 100 rotates during normal travel.

  The first inclined surface 811 is inclined outward in the axial direction in the first direction. That is, the first inclined surface 811 faces in the first direction and faces inward in the axial direction.

  The second inclined surface 812 is constituted by a part of the inner wall surface which defines the through hole 422 of the second pressing member 4. Specifically, the second inclined surface 812 is constituted by a surface of the inner wall surface defining the through hole 422, which faces in the second direction. The second direction means the direction opposite to the direction in which the clutch device 100 rotates during normal travel.

  The second inclined surface 812 is opposed to the first inclined surface 811. The second inclined surface 812 may be spaced apart from the first inclined surface 811 or may be in contact with the first inclined surface 811.

  The second inclined surface 812 is inclined outward in the first direction in the axial direction. That is, the second inclined surface 812 faces the second direction and faces the axially outer side.

  The second cam portion 82 is configured of a third inclined surface 813 formed on the first pressing member 3 and a fourth inclined surface 814 formed on the second pressing member 4.

  The third inclined surface 813 is configured by a part of the outer peripheral surface of the protrusion 33 of the first pressing member 3. In detail, the third inclined surface 813 is configured by a surface of the outer peripheral surface of the protruding portion 33 that faces in the second direction.

  The third inclined surface 813 is inclined in the second direction outward in the axial direction. That is, the third inclined surface 813 faces in the second direction and faces inward in the axial direction.

  The fourth inclined surface 814 is constituted by a part of the inner wall surface which defines the through hole 422 of the second pressing member 4. In detail, the fourth inclined surface 814 is constituted by a surface of the inner wall surface defining the through hole 422, which faces in the first direction.

  The fourth inclined surface 814 is opposed to the third inclined surface 813. The fourth inclined surface 814 may be spaced apart from the third inclined surface 813, or may be in contact with the third inclined surface 813.

  The fourth inclined surface 814 is inclined in the second direction toward the axially outer side. That is, the fourth inclined surface 814 faces the first direction and faces the axially outer side.

[Operation]
Next, the operation of the clutch device 100 will be described. The clutch device 100 rotates in the first direction during normal travel. When the release operation is not performed in the clutch device 100, the release member 5 and the second pressing member 4 are biased by the biasing member 6 in a direction away from each other. Since the second pressing member 4 does not move in the axial direction, the release member 5 moves outward in the axial direction. Since the release member 5 is connected to the first pressing member 3, the first pressing member 3 also moves outward in the axial direction. As a result, the first and second clutches C1 and C2 are in the transmission state.

  In such a state, the torque from the engine is input to the clutch housing 2 and transmitted to the first and second pressing members 3 and 4 via the first and second clutches C1 and C2. Here, since the first pressing member 3 rotates relative to the second pressing member 4 in the first direction, the cam mechanism 8 is configured such that the first pressing surface 311 approaches the first pressure receiving surface 221. Move 3 axially outward. As a result, the coupling force of the clutches by the first and second clutches C1 and C2 is increased, and the torque transmission capacity is improved.

  Specifically, when the first pressing member 3 rotates relative to the second pressing member 4 in the first direction, the relative rotation causes the first inclined surface 811 to press the second inclined surface 812 against each other. As a result, the first pressing member 3 moves outward in the axial direction, and moves outward in the axial direction so that the first pressing surface 311 approaches the first pressure receiving surface 221. As a result, the coupling force of the first and second clutches C1 and C2 is increased.

  On the other hand, when cranking is performed by a kick starter or the like, the rotational speed of the second pressing member 4 is faster than that of the first pressing member 3. In this case, the first pressing member 3 rotates relative to the second cam portion 82 in the second direction. By this relative rotation, the cam mechanism 8 moves the first pressing member 3 outward in the axial direction such that the first pressing surface 311 approaches the first pressure receiving surface 221. As a result, the coupling force of the first and second clutches C1 and C2 is increased.

  In detail, when the first pressing member 3 rotates relative to the second pressing member 4 in the second direction, the third inclined surface 813 presses the fourth inclined surface 814 with each other by this relative rotation. As a result, the first pressing member 3 moves outward in the axial direction, and moves outward in the axial direction so that the first pressing surface 311 approaches the first pressure receiving surface 221. As a result, the coupling force of the first and second clutches C1 and C2 is increased.

  Next, when the rider grips the clutch lever, the operating force is transmitted to the release mechanism via a clutch wire or the like. By the release mechanism, the release member 5 moves inward in the axial direction against the biasing force of the biasing member 6. When the release member 5 moves inward in the axial direction, the first pressing member 3 connected to the release member 5 also moves inward in the axial direction. For this reason, the pressing force on the first pressure receiving surface 221 of the first pressing member 3 is released, and the first and second clutches C1, C2 are turned off. In this clutch off state, the rotation from the clutch housing 2 is not transmitted to the second pressing member 4.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention.

  (A) The cam mechanism 8 of the above embodiment moves the first pressing member 3 in the axial direction when the first pressing member 3 rotates relative to the second pressing member 4 in the first direction or the second direction. Although the first pressing surface 311 is close to the second pressure receiving surface 221, the configuration of the cam mechanism 8 is not limited to this.

  For example, as shown in FIG. 4, the cam mechanism 8 may have only the first cam portion 81 and may not have the second cam portion 82. In this case, even if the first pressing member 3 rotates relative to the second pressing member 4 in the second direction, the first pressing member 3 does not move in the axial direction.

  Further, as shown in FIG. 5, the cam mechanism 8 may have only the second cam portion 82 and may not have the first cam portion 81. In this case, even if the first pressing member 3 rotates relative to the second pressing member 4 in the first direction, the first pressing member 3 does not move in the axial direction.

  Further, as shown in FIG. 6, the cam mechanism 8 may have a third cam portion 83 instead of the second cam portion 82. That is, the cam mechanism 8 may have the first cam portion 81 and the third cam portion 83.

  The third cam portion 83 is configured of a fifth inclined surface 815 formed on the first pressing member 3 and a sixth inclined surface 816 formed on the second pressing member 4.

  The fifth inclined surface 815 is configured by a part of the outer peripheral surface of the protrusion 33 of the first pressing member 3. In detail, the fifth inclined surface 815 is formed of a surface of the outer peripheral surface of the protrusion 33 facing in the second direction.

  The fifth inclined surface 815 is inclined outward in the first direction in the axial direction. That is, the fifth inclined surface 815 faces the second direction and faces the axially outer side.

  The sixth inclined surface 816 is constituted by a part of the inner wall surface which defines the through hole 422 of the second pressing member 4. Specifically, the sixth inclined surface 816 is formed of a surface of the inner wall surface defining the through hole 422, which faces in the first direction.

  The sixth inclined surface 816 faces the fifth inclined surface 815. The sixth sloped surface 816 may be spaced apart from the fifth sloped surface 815, or may be in contact with the fifth sloped surface 815.

  The sixth inclined surface 816 is inclined in the first direction axially outward. That is, the sixth inclined surface 816 faces in the first direction and faces inward in the axial direction.

  According to this configuration, the third cam portion 83 operates as follows. For example, when downshifting, the rotational speed of the second pressing member 4 is faster than that of the first pressing member 3, so the first pressing member 3 rotates relative to the second pressing member 4 in the second direction. By this relative rotation, the cam mechanism 8 moves the first pressing member 3 inward in the axial direction such that the first pressing surface 311 is separated from the first pressure receiving surface 221. As a result, the coupling force of the first and second clutches C1 and C2 is reduced. According to this, a sudden engine brake can be prevented.

  Specifically, when the first pressing member 3 rotates relative to the second pressing member 4 in the second direction, the fifth inclined surface 815 presses the sixth inclined surface 816 with each other by this relative rotation. As a result, the first pressing member 3 moves inward in the axial direction, and the first pressing surface 311 moves inward in the axial direction so as to be separated from the first pressure receiving surface 221. As a result, the coupling force of the first and second clutches C1 and C2 is reduced.

  (B) In the above-mentioned embodiment, although each slope which constitutes cam mechanism 8 is formed in the 1st or 2nd press members 3 and 4, composition of cam mechanism 8 is not limited to this. For example, as shown in FIG. 7, the inclined surface constituting the cam mechanism 8 may be formed on the release member 5 instead of the first pressing member 3.

  For example, the first pressing member 3 does not have the protrusion 33. The protrusion 52 of the release member 5 extends to the disc portion 32 of the first pressing member 3 via the through hole 422 of the second pressing member 4. The projection 52 of the release member 5 is attached to the disc portion 32. The first and third inclined surfaces 811 and 813 constituting the cam mechanism 8 are formed not on the projecting portion 33 but on the projecting portion 52. Also in this modification, the first cam portion 81 or the second cam portion 82 may be omitted, or the third cam portion 83 may be provided instead of the second cam portion 82. When the third cam portion 83 is provided, the fifth inclined surface 815 is formed on the protrusion 52.

  (C) In the above embodiment, the first pressing member 3 is disposed inward in the axial direction than the second pressing member 4, but the positional relationship between the first and second pressing members 3 and 4 is not limited thereto. . For example, as shown in FIG. 8, the first pressing member 3 may be disposed outside the second pressing member 4 in the axial direction. In this case, the first pressure receiving surface 221 is disposed outside the second pressure receiving surface 222 in the axial direction. The first pressure receiving surface 221 faces the outside in the axial direction, and the second pressure receiving surface 222 faces the inside in the axial direction.

  The first pressing member 3 has a plurality of through holes 323 arranged at intervals in the circumferential direction. The through holes 323 are formed in the disc portion 32. The second pressing member 4 has a plurality of projecting portions 44 spaced apart in the circumferential direction. The protrusion 44 extends axially outward from the disc portion 42 through the through hole 323. The support 45 is attached to the tip of the projection 44.

  The biasing member 6 biases the first pressing member 3 inward in the axial direction. In detail, the biasing member 6 is a compressed coil spring, and is disposed between the disc portion 32 of the first pressing member 3 and the support portion 45 of the second pressing member 4.

  The cam mechanism 8 is constituted by an inner wall surface defining the through hole 323 of the first pressing member 3 and an outer peripheral surface of the projecting portion 44 of the second pressing member 4. The basic configuration of the cam mechanism 8 is the same as that of the above embodiment, and thus the detailed description is omitted. In the present modification, the inner side in the axial direction corresponds to the second side in the axial direction of the present invention, and the outer side in the axial direction corresponds to the first side in the axial direction of the present invention.

  (D) Both the first and second pressure receiving surfaces 2b and 2c may be formed on one clutch shoe 22.

2 clutch housing 221 first pressure receiving surface 222 second pressure receiving surface 3 first pressing member 311 first pressing surface 4 second pressing member 411 second pressing surface 8 cam mechanism

Claims (9)

A clutch device that transmits power from a drive source to an output side member and rotates in a first direction,
A clutch housing having a tapered first pressure receiving surface facing the first axial direction and a tapered second pressure receiving surface facing the second axial direction, and power from the drive source being input; A first pressing member having a tapered first pressing surface for pressing the first pressure receiving surface and movable in an axial direction;
A second pressing member having a tapered second pressing surface for pressing the second pressure receiving surface and coupled to the output side member;
A cam mechanism that converts relative rotation of the first pressing member with respect to the second pressing member into axial movement of the first pressing member such that the first pressing surface approaches the first pressure receiving surface;
, A clutch device.
The cam mechanism moves the first pressing member so that the first pressing surface approaches the first pressure receiving surface when the first pressing member is relatively rotated in the first direction with respect to the second pressing member. Move axially,
The clutch device according to claim 1.
The cam mechanism causes the first pressing surface to approach the first pressure receiving surface when the first pressing member is relatively rotated in the second direction opposite to the first direction with respect to the second pressing member. To move the first pressing member in the axial direction,
The clutch apparatus of Claim 1 or 2.
The cam mechanism moves the first pressing member so that the first pressing surface approaches the first pressure receiving surface when the first pressing member is relatively rotated in the first direction with respect to the second pressing member. The first pressing surface is separated from the first pressure receiving surface when it is moved in the axial direction and the first pressing member is rotated relative to the second pressing member in a second direction opposite to the first direction. To move the first pressing member in the axial direction,
The clutch device according to claim 1.
The cam mechanism is constituted by an inclined surface formed on each of the first and second pressing members.
The clutch device according to any one of claims 1 to 4.
The second pressing member has a plurality of through holes arranged at intervals in the circumferential direction,
The first pressing member has a plurality of protrusions extending in the axial direction via the respective through holes,
The cam mechanism is configured by an inner wall surface of the through hole and an outer peripheral surface of the protrusion.
The clutch apparatus in any one of Claims 1-5.
It further comprises a release member having a plurality of projections spaced in the circumferential direction,
The protrusion is attached to the protrusion.
The clutch apparatus of Claim 6.
It further comprises a release member having a plurality of projections spaced in the circumferential direction,
The second pressing member has through holes arranged at intervals in the circumferential direction,
The protrusion is attached to the first pressing member via the through hole,
The cam mechanism includes an inner wall surface of the through hole and an outer peripheral surface of the protrusion.
The clutch apparatus in any one of Claims 1-5.
The first pressing member has a plurality of through holes arranged at intervals in the circumferential direction,
The second pressing member has a protrusion extending in the axial direction through the through hole,
The cam mechanism is configured by an inner wall surface of the through hole and an outer peripheral surface of the protrusion.
The clutch apparatus in any one of Claims 1-5.

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