JP2010223296A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device capable of positively stopping relative movement between a clutch member and a pressure member at a position where a clutch member side wall face is abutted on a pressure member side wall face. <P>SOLUTION: The power transmission device includes a stopper for restricting axial movement of the pressure member 5 by restricting further relative rotation between the pressure member 5 and the clutch member 4 after a back torque limiter cam functions and a driving side clutch plate 6 and a driven side clutch plate 7 are separated. The clutch member side wall face 11 and the pressure member side wall face 12 of the stopper are formed to extend radially on opposing faces of the clutch member 4 and the pressure member 5, and an extension line T2 in the radial direction is offset from rotational centers of the clutch member 4 and the pressure member 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power transmission device that can arbitrarily transmit or block the rotational force of an input member to an output member.

  In general, a power transmission device included in a motorcycle is used to arbitrarily transmit or cut off the driving force of an engine to and from a driving wheel. An input member connected to the engine side, and the transmission and driving wheel side And an output member connected to the output member, and a clutch member connected to the output member. The transmission of the power is cut off by releasing the pressure contact force.

  More specifically, the conventional power transmission device includes a clutch housing that rotates as the input member rotates to form a plurality of drive-side clutch plates, and a plurality of driven bodies that are alternately formed with the drive-side clutch plates of the clutch housing. Side clutch plate, clutch member connected to the output member, and attached to the clutch member while being movable in the axial direction of the clutch member, and driven side clutch plate and driven as the clutch member moves in the axial direction A pressure member capable of pressing or separating the side clutch plate, and transmitting or blocking the rotational force input to the input member to the output member by pressing or separating the driving side clutch plate and the driven side clutch plate. Configured to get.

  However, conventionally, the clutch member-side cam surface provided on the clutch member and the pressure-member-side cam surface provided on the pressure member, the rotation of the output member exceeds the rotation speed of the input member, and the pressure member When the clutch member rotates relatively, the pressure member is moved in the axial direction by the cam action of the clutch member side cam surface and the pressure member side cam surface, and the driving side clutch plate and the driven side clutch plate are separated from each other. A back torque limiter cam has been proposed, and further comprises a clutch member side wall surface provided on the clutch member and a pressure member side wall surface formed on the pressure member. After the drive cam functions and the drive side clutch plate and the driven side clutch plate are separated, the clutch member side wall surface A stopper (reverse rotation side stopper) that restricts further relative rotation between the pressure member and the clutch member and restricts the axial movement of the clutch member by contacting the side wall surface of the pressure member. Has been proposed.

  In such a conventional power transmission device, the clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper are formed to extend radially on the opposing surfaces of the clutch member and the pressure member, and the radial direction (the width of the wall surface). The extension line to the direction) passes through the rotation center of the clutch member and the pressure member. Furthermore, the clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper are provided with a gradient angle in the direction of the rotation axis (the height direction of the wall surface) of the clutch member and the pressure member in order to facilitate die-cutting during molding. It was.

  Further, in the conventional power transmission device, in addition to the stopper, the clutch includes a clutch member side wall surface provided on the clutch member and a pressure member side wall surface formed on the pressure member. After the plate is in pressure contact, the side wall surface of the clutch member and the side wall surface of the pressure member come into contact with each other, thereby forming a stopper (forward rotation stopper) that rotates the pressure member and the clutch member together. Also in the forward rotation side stopper, like the reverse rotation side stopper, the clutch member side wall surface and the pressure member side wall surface are arranged in the direction of the rotation axis (the height of the wall surface) of the clutch member and the pressure member in order to facilitate the die removal during molding. Direction) was given a gradient angle. In addition, since this prior art does not relate to the literature known invention, there is no prior art document information to be described.

  However, in the conventional power transmission device described above, a gradient angle is provided in the axial direction of the clutch member and the pressure member with respect to the clutch member side wall surface and the pressure member side wall surface of the stopper (both the reverse rotation side stopper and the forward rotation side stopper). Therefore, even after the side wall surface of the clutch member and the side wall surface of the pressure member are in contact with each other, there is a problem that the pressure member moves up with respect to the clutch member by a slight gradient angle. Therefore, the clutch member side wall surface and the pressure member side wall surface move slightly after contact, and there is a problem that the moving dimension of the pressure member relative to the clutch member becomes larger than the setting.

  The present invention has been made in view of such circumstances, and reliably stops the relative movement between the clutch member and the pressure member at a position where the side wall surface of the clutch member and the side wall surface of the pressure member are in contact with each other. It is in providing the power transmission device which can do.

  According to the first aspect of the present invention, a clutch housing that is rotated with the rotation of the input member to form a plurality of drive side clutch plates, and a plurality of driven side clutch plates that are alternately formed with the drive side clutch plates of the clutch housing, A clutch member coupled to the output member, and the clutch member is attached to the clutch member while being movable in the axial direction, and the driving side clutch plate and the driven side clutch are moved in the axial direction with respect to the clutch member. A pressure member capable of pressing or separating the plate, a clutch member side wall surface provided on the clutch member, and a pressure member side wall surface formed on the pressure member, and the clutch member side wall surface and the pressure member side wall surface And a stopper that can be contacted, and the driving clutch plate and the driven clutch plate are pressed against or separated from each other. Thus, in the power transmission device capable of transmitting or shutting off the rotational force input to the input member to the output member, the clutch member side wall surface and the pressure member side wall surface of the stopper are opposed surfaces of the clutch member and the pressure member. And the extension line in the radial direction is formed offset from the rotation center of the clutch member and the pressure member.

  According to a second aspect of the present invention, in the power transmission device according to the first aspect, the output member includes a clutch member side cam surface provided on the clutch member and a pressure member side cam surface provided on the pressure member. When the pressure member and the clutch member rotate relative to each other when the rotation of the pressure member exceeds the rotational speed of the input member, the pressure member is moved in the axial direction by the cam action of the clutch member side cam surface and the pressure member side cam surface. And a back torque limiter cam that can move the drive side clutch plate and the driven side clutch plate away from each other, and the stopper functions as a function of the back torque limiter cam. After the side clutch plate is separated, the clutch member side wall surface and the pressure member side wall surface come into contact with each other, Regulates the further relative rotation between the serial pressure member and the clutch member, characterized in that it consists Forward stopper for restricting the axial movement of the pressure member.

  According to a third aspect of the present invention, in the power transmission device according to the first aspect, the stopper includes a side wall surface of the clutch member and a side wall surface of the pressure member after the driving side clutch plate and the driven side clutch plate are pressed against each other. It comprises a forward rotation side stopper that rotates the pressure member and the clutch member integrally by contacting with each other.

  According to a fourth aspect of the present invention, in the power transmission device according to any one of the first to third aspects, the clutch member side wall surface and the pressure member side wall surface of the stopper are in an axial direction of the clutch member and the pressure member. A gradient angle is imparted to the radial direction of the clutch member and the pressure member, and a radial line passing through the rotation center of the clutch member and the pressure member extends in a direction inclined at an angle larger than the gradient angle.

  According to a fifth aspect of the present invention, in the power transmission device according to any one of the first to fourth aspects, a plurality of the clutch member side wall surfaces are formed at substantially equal intervals in the circumferential direction of the clutch member. In addition, the pressure member is formed with a plurality of pressure member side wall surfaces at substantially equal intervals corresponding to the clutch member side wall surface.

  According to a sixth aspect of the present invention, there is provided a clutch housing that is rotated with the rotation of the input member to form a plurality of drive side clutch plates, and a plurality of driven side clutch plates that are alternately formed with the drive side clutch plates of the clutch housing. A clutch member coupled to the output member, and the clutch member is attached to the clutch member while being movable in the axial direction, and the driving side clutch plate and the driven side clutch are moved in the axial direction with respect to the clutch member. A pressure member that can press or separate the plate, and an intermediate member that is spline-fitted to the driven clutch plate and that is interposed between the clutch member and the pressure member and can rotate with the clutch member and the pressure member. A clutch member side cam surface provided on the clutch member and an intermediate member provided on the intermediate member And when the rotation of the output member exceeds the rotation speed of the input member and the intermediate member and the clutch member rotate relatively, the cam by the clutch member side cam surface and the intermediate member side cam surface A back torque limiter cam capable of moving the intermediate member in the axial direction and separating the driving side clutch plate and the driven side clutch plate by the action of the clutch member side wall surface and the pressure member provided on the clutch member The pressure member side wall surface is formed on the clutch member side wall surface and the pressure member side wall surface can be brought into contact with each other, and the back torque limiter cam functions to function the driving side clutch plate and the driven side. After the clutch plate is separated, the clutch member side wall surface and the pressure member side wall surface come into contact with each other, so that the intermediate member and the clutch member are in contact with each other. A reverse-side stopper that restricts further relative rotation between the intermediate member and the axial movement of the intermediate member, and presses or separates the drive-side clutch plate and the driven-side clutch plate. In the power transmission device that can transmit or block the rotational force input to the input member to the output member, the clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper are opposed to the clutch member and the pressure member. The surface extends in the radial direction, and the extension line in the radial direction is formed offset from the rotation center of the clutch member and the pressure member.

  According to a seventh aspect of the present invention, in the power transmission device of the sixth aspect, the clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper have a gradient angle with respect to the axial direction of the clutch member and the pressure member. And is extended in a direction inclined at an angle larger than the gradient angle with respect to a radial straight line passing through the rotation center of the clutch member and the pressure member.

  The invention according to claim 8 is a clutch housing that is rotated with the rotation of the input member to form a plurality of drive side clutch plates, and a plurality of driven side clutch plates that are alternately formed with the drive side clutch plates of the clutch housing. A clutch member coupled to the output member, and the clutch member is attached to the clutch member while being movable in the axial direction, and the driving side clutch plate and the driven side clutch are moved in the axial direction with respect to the clutch member. A pressure member that can press or separate the plate, and an intermediate member that is spline-fitted to the driven clutch plate and that is interposed between the clutch member and the pressure member and can rotate with the clutch member and the pressure member. And a clutch member side wall surface provided on the clutch member and an intermediate member side formed on the intermediate member The clutch member side wall surface and the intermediate member side wall surface can come into contact with each other, and after the driving side clutch plate and the driven side clutch plate are in pressure contact, the clutch member side wall surface and the intermediate member side The intermediate member and the clutch member have a forward rotation side stopper that rotates integrally with the wall surface, and the input member is separated from the drive side clutch plate and the driven side clutch plate by pressure contact or separation. In the power transmission device capable of transmitting or shutting off the input rotational force to the output member, the clutch member side wall surface and the intermediate member side wall surface of the forward rotation side stopper have a diameter at a surface opposite to the clutch member and the intermediate member. The extension line extending in the direction and extending in the radial direction is formed offset from the rotation center of the clutch member and the intermediate member.

  According to a ninth aspect of the present invention, in the power transmission device according to the eighth aspect, the clutch member side wall surface and the intermediate member side wall surface of the forward rotation side stopper are inclined with respect to the axial direction of the clutch member and the intermediate member. And extending in a direction inclined at an angle larger than the gradient angle with respect to a radial straight line passing through the rotation center of the clutch member and the intermediate member.

  According to the first aspect of the present invention, the clutch member side wall surface and the pressure member side wall surface of the stopper extend in the radial direction on the surfaces of the clutch member and the pressure member facing each other, and the extension line in the radial direction is the clutch. Since it is formed offset from the rotation center of the member and the pressure member, the relative movement between the clutch member and the pressure member is surely stopped at the position where the side wall surface of the clutch member and the side wall surface of the pressure member abut. Can do.

  According to the invention of claim 2, after the back torque limiter cam functions and the drive side clutch plate and the driven side clutch plate are separated from each other, the clutch member side wall surface and the pressure member side wall surface are brought into contact with each other by the reverse rotation side stopper. The movement of the pressure member can be reliably stopped at the contacted position.

  According to the invention of claim 3, after the driving side clutch plate and the driven side clutch plate are brought into pressure contact with each other, when the pressure member and the clutch member are integrally rotated by the forward rotation side stopper, The relative movement of the pressure member relative to the clutch member can be reliably stopped at the position where the pressure member side wall surface comes into contact.

  According to the invention of claim 4, the clutch member side wall surface and the pressure member side wall surface of the stopper are provided with a gradient angle with respect to the axial direction of the clutch member and the pressure member, and the rotation center of the clutch member and the pressure member. Since it extends in a direction inclined at an angle larger than the gradient angle with respect to the straight line in the radial direction, the pressure member moves at a position where the side wall surface of the clutch member and the side wall surface of the pressure member are in contact with each other more reliably and accurately. Can be stopped.

  According to the invention of claim 5, a plurality of the clutch member side wall surfaces are formed at substantially equal intervals in the circumferential direction of the clutch member, and the pressure member corresponds to the clutch member side wall surface. Since a plurality of pressure member side wall surfaces are formed at substantially equal intervals, the movement of the pressure member can be stopped at a position where the clutch member side wall surface and the pressure member side wall surface are in contact with each other more reliably and accurately.

  According to the sixth aspect of the present invention, the clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper extend in the radial direction at the opposing surfaces of the clutch member and the pressure member, and the extension line in the radial direction is Since it is formed offset from the rotation center of the clutch member and the pressure member, after the cam for back torque limiter functions and the drive side clutch plate and the driven side clutch plate are separated, the side wall surface of the clutch member is The movement of the pressure member can be reliably stopped at the position where the pressure member side wall surface comes into contact with the pressure member.

  According to the invention of claim 7, the clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper are provided with a gradient angle with respect to the axial direction of the clutch member and the pressure member, and the rotation of the clutch member and the pressure member. Since it extends in a direction inclined at an angle larger than the gradient angle with respect to a straight line in the radial direction passing through the center, the pressure member is positioned at a position where the side wall surface of the clutch member and the side wall surface of the pressure member are in contact with each other more reliably and accurately. And the movement of the intermediate member can be stopped.

  According to the eighth aspect of the present invention, the clutch member side wall surface and the intermediate member side wall surface of the forward rotation side stopper extend in the radial direction at the opposing surfaces of the clutch member and the intermediate member, and the extension line in the radial direction is provided. Since it is formed offset from the rotation center of the clutch member and the intermediate member, after the driving side clutch plate and the driven side clutch plate are in pressure contact, the pressure member, the intermediate member, and the clutch member are integrated by the forward rotation side stopper. Therefore, the relative movement of the pressure member and the intermediate member with respect to the clutch member can be reliably stopped at the position where the side wall surface of the clutch member and the side wall surface of the intermediate member are in contact with each other.

  According to the ninth aspect of the present invention, the clutch member side wall surface and the intermediate member side wall surface of the forward rotation side stopper are given a gradient angle with respect to the axial direction of the clutch member and the intermediate member, and Since it extends in a direction inclined at an angle larger than the gradient angle with respect to a straight line in the radial direction passing through the rotation center, the pressure is applied at a position where the side wall surface of the clutch member and the side wall surface of the intermediate member are in contact with each other more reliably and accurately. The movement of the member and the intermediate member can be stopped.

1 is an overall longitudinal sectional view showing a power transmission device according to a first embodiment of the present invention. The top view which shows the clutch member in the power transmission device A perspective view showing the clutch member The schematic diagram which shows the clutch member side cam surface provided in the clutch member in the same power transmission device, and the pressure member side cam surface provided in the pressure member. The schematic diagram which shows the clutch member side wall surface and pressure member side wall surface of the stopper in the same power transmission device Whole longitudinal cross-sectional view which shows the power transmission device which concerns on the 2nd Embodiment of this invention The top view which shows the clutch member in the power transmission device A perspective view showing the clutch member The schematic diagram which shows the clutch member side wall surface and pressure member side wall surface of the stopper in the same power transmission device The perspective view which shows the clutch member in the power transmission device which concerns on other embodiment of this invention. The perspective view which shows the clutch member in the power transmission device which concerns on further another embodiment of this invention. Whole longitudinal cross-sectional view which shows the power transmission device which concerns on the 3rd Embodiment of this invention The perspective view which shows the clutch member in the same power transmission device, an intermediate member, and a pressure member The perspective view which shows the pressure member in the same power transmission device

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The power transmission device according to the first embodiment is provided in a vehicle such as a two-wheeled vehicle, and is obtained by die casting for arbitrarily transmitting or shutting off the driving force of the engine to the mission or driving wheel side. 1 to 3, a clutch housing 2 in which a gear 1 as an input member is formed, a clutch member 4 connected to a shaft 3 as an output member, and the clutch member 4 is formed on the right end side in the figure. A pressure member 5, a drive side clutch plate 6 connected to the clutch housing 2 side, a driven side clutch plate 7 connected to the clutch member 4 side, a clutch member side cam surface 4b provided to the clutch member 4, and a pressure. Pressure member-side cam surface 5 b provided on the member 5, clutch member side wall surface 11 provided on the clutch member 4, and pressure formed on the pressure member 5. It is mainly configured from a stopper made of wood side wall 10 Metropolitan (reverse side stopper).

  The gear 1 is rotatable about the shaft 3 when a driving force (rotational force) transmitted from the engine is input, and is connected to the clutch housing 2 by a rivet 8 or the like. The clutch housing 2 is formed of a cylindrical case member opened on the right end side of the figure, and a plurality of drive side clutch plates 6 are formed from the inner peripheral wall thereof. Each of the drive side clutch plates 6 is made of a plate material formed in a substantially annular shape, and is configured to rotate with the rotation of the clutch housing 2 and to slide in the axial direction (left-right direction in the figure). Yes.

  The clutch member 4 is a member disposed in the clutch housing 2. The shaft 3 is connected to the substantially center of the clutch member 4 by spline fitting while passing therethrough, and the shaft 3 is also rotated when the clutch member 4 rotates. The pressure member 5 is disposed at the position on the right end side of the clutch member 4 in the figure, and is always urged by the clutch spring S in the left direction in the figure. A spline (spline fitting portion 5a) extending in the axial direction (left-right direction in the figure) is formed on the outer peripheral side surface of the pressure member 5, and the driven clutch plate 7 is fitted into the spline. Yes.

  More specifically, the spline formed on the pressure member 5 is formed in a concavo-convex shape integrally formed over substantially the entire circumference on the outer peripheral side surface thereof, and is moved to the concave groove forming the spline. Since the clutch plate 7 is fitted, the movement of the driven side clutch plate 7 in the axial direction with respect to the pressure member 5 is allowed to be restricted and the rotation in the rotational direction is restricted, and the clutch plate 7 can rotate with the pressure member 5. is there.

  The driven clutch plates 7 are alternately stacked with the driving clutch plates 6 so that the adjacent clutch plates 6 and 7 can be pressed against or separated from each other. That is, both clutch plates 6 and 7 are allowed to slide in the axial direction of the pressure member 5, and are pressed into contact with each other when the pressure member 5 is pressed leftward in FIG. 1 to rotate the clutch housing 2. The force is transmitted to the clutch member 4 and the shaft 3 via the pressure member 5, and when the pressure by the pressure member 5 is released, the clutch member 4 stops and stops following the rotation of the clutch housing 2. The transmission of the rotational force to 3 is not made.

  The separation of the clutch plates 6 and 7 here does not have to be a state in which a clearance is generated between the clutch plates 6 and 7, and the pressure contact force is not required even if a physical clearance is not generated. It also includes a state where the clutch member 4 is released and does not follow the rotation of the clutch housing 2 (that is, a state where the drive side clutch plate 6 slides on the driven side clutch plate 7).

  On the other hand, the surface of the edge portion 5d of the pressure member 5 is in contact with the rightmost portion of the laminated driving side clutch plate 6 in the figure, and the pressure member 5 that has obtained the urging force of the clutch spring S is obtained. By pressing the rightmost drive side clutch plate 6, both clutch plates 6 and 7 are brought into pressure contact with each other. Accordingly, the clutch housing 2 and the clutch member 4 are always connected, and the shaft 3 can be rotated when a rotational force is input to the gear 1. 4a shows the edge of the clutch member 4 facing the edge 5d, and the driven side clutch plates 7 and the drive side clutch plates 6 are alternately laminated between the edges 5d and 4a. Is formed.

  However, a push rod 9 extending in the axial direction is disposed inside the shaft 3, and when the driver operates an operating means (not shown), the push rod 9 protrudes to the right in the figure, The pressure member 5 can be moved rightward against the urging force of the clutch spring S. When the pressure member 5 moves in the left direction, the pressure contact force between the driving side clutch plate 6 and the driven side clutch plate 7 is released, and the rotational force input to the gear 1 and the clutch housing 2 in the separated state becomes the clutch member 4. And it is interrupted without being transmitted to the shaft 3.

  That is, the pressure member 5 is configured so that the driving side clutch plate 6 and the driven side clutch plate 7 can be pressed against or separated from each other as the clutch member 4 moves in the axial direction. In FIG. 1, reference numeral 5 c indicates a boss portion protruding from the pressure member 5 toward the clutch member 4, and reference numeral 4 c in FIG. 1 is formed protruding from the clutch member 4 toward the pressure member 5. A boss portion is shown, and the clutch spring S is sandwiched and assembled by the boss portions 4c and 5c.

  By the way, the clutch member 4 and the pressure member 5 are respectively formed with a clutch member side cam surface 4b and a pressure member side cam surface 5b which can be brought into contact with and separated from each other, and these clutch member side cam surface 4b and The pressure member side cam surface 5b constitutes a back torque limiter cam. That is, the back torque limiter cam is composed of a clutch member side cam surface 4b provided on the clutch member 4 and a pressure member side cam surface 5b provided on the pressure member 5, and the rotation of the shaft 3 (output member) is a gear. When the pressure member 5 and the clutch member 4 are rotated relative to each other exceeding the rotational speed of the input member such as 1, the clutch member side cam surface 4 b and the pressure member side cam surface 5 b are used as shown in FIG. The pressure member 5 can be moved in the axial direction (rightward in FIG. 4) by the action of the cam, and the drive side clutch plate 6 and the driven side clutch plate 7 can be separated.

  Further, the clutch member 4 and the pressure member 5 are respectively formed with a clutch member side wall surface 11 and a pressure member side wall surface 10 which can be brought into contact with and separated from each other. The wall surface 10 constitutes a stopper (reverse rotation side stopper). That is, the reverse rotation side stopper includes a clutch member side wall surface 11 provided on the clutch member 4 and a pressure member side wall surface 10 formed on the pressure member 5, and the above-described back torque limiter cam functions to drive the clutch After the plate 6 and the driven clutch plate 7 are separated from each other, the clutch member side wall surface 11 and the pressure member side wall surface 10 come into contact with each other as shown in FIG. Further relative rotation is restricted, and movement of the pressure member 5 in the axial direction is restricted.

  2 and 3, reference numeral 4 d denotes the side of the clutch member 4 to be brought into contact with a wall surface (not shown) formed on the pressure member 5 side after the driving side clutch plate 6 and the driven side clutch plate 7 are in pressure contact. The wall surface 4d of the clutch member 4 and the wall surface of the pressure member 5 are in contact with each other, whereby the pressure member 4 and the clutch member 5 are integrally rotated. . The wall surface 4d formed on the clutch member 4 and the wall surface formed on the pressure member 5 are referred to as a forward rotation side stopper with respect to the reverse rotation side stopper.

  Here, the clutch member side wall surface 11 (same as the pressure member side wall surface 10) of the reverse rotation side stopper in the present embodiment extends in the radial direction on the surfaces of the clutch member 4 and the pressure member 5 facing each other as shown in FIG. Further, the extension line T2 in the radial direction is formed by being offset from the rotation center L of the clutch member 4 (or the pressure member 5) by the dimension A. In other words, as shown in FIG. 5, the clutch member side wall surface 11 and the pressure member side wall surface 10 have a radial straight line T <b> 1 passing through the rotation center L of the clutch member 4 and the pressure member 5. As a result, the extension line T2 in the radial direction is offset from the rotation center L of the clutch member 4 and the pressure member 5.

  However, in the present embodiment, the clutch member 4 is formed with a plurality (three) of clutch member side wall surfaces 11 at substantially equal intervals in the circumferential direction, and the pressure member 5 has the clutch member side. Corresponding to the wall surface 11, a plurality (three) of pressure member side wall surfaces 10 are formed at substantially equal intervals. Accordingly, the movement of the pressure member 5 can be stopped at a position where the clutch member side wall surface 11 and the pressure member side wall surface 10 are in contact with each other more reliably and accurately. In the present embodiment, three clutch member side wall surfaces 11 and pressure member side wall surfaces 10 are formed, but two, four or more, or one may be formed. Moreover, although the pressure member side wall surface 10 is formed so that a part of the side surface of the boss portion 5c of the pressure member 5 is flat, it may be provided in another part.

  Further, the clutch member side wall surface 11 and the pressure member side wall surface 10 constituting the stopper (reverse rotation side stopper) in the present embodiment are arranged in the axial direction of the clutch member 4 and the pressure member 5 (that is, the clutch member side wall surface 11 and the pressure member side). A gradient angle is given to the height direction of the wall surface 10 and an angle a (gradient angle) larger than the gradient angle with respect to the radial straight line T1 passing through the rotation center L of the clutch member 4 and the pressure member 5. Where θ is θ, a = θ + α) extends in an inclined direction.

  As a result, the force for stopping the rotation of the pressure member 5 is increased by extending the pressure member 5 by inclining a rather than the force for moving the pressure member 5 in the axial direction according to the gradient angle. The movement of the pressure member 5 can be stopped at a position where the clutch member side wall surface 11 and the pressure member side wall surface 10 are in contact with each other. Strictly speaking, the force to move the pressure member 5 in the plane direction is larger than the force to move in the axial direction, but it stops because it cannot move in the plane direction. The extending direction of the clutch member side wall surface 11 and the pressure member side wall surface 10 may be any of the left and right directions (clockwise or counterclockwise) with respect to the radial straight line T1 passing through the rotation center L of the clutch member 4 and the pressure member 5. It may be inclined in any direction.

  According to this embodiment, the clutch member side wall surface 11 and the pressure member side wall surface 10 constituting the stopper (reverse rotation side stopper) extend in the radial direction on the opposing surfaces of the clutch member 4 and the pressure member 5, and the diameter thereof. Since the extension line T2 in the direction is offset from the rotation center L of the clutch member 4 and the pressure member 5, the back torque limiter cam functions so that the drive side clutch plate 6 and the driven side clutch plate 7 are connected. After the separation, the movement of the pressure member 5 can be reliably stopped at the position where the clutch member side wall surface 11 and the pressure member side wall surface 10 are in contact with each other.

Next, a power transmission device according to a second embodiment of the present invention will be described.
The power transmission device according to the present embodiment is provided in a vehicle such as a two-wheeled vehicle, and is obtained by molding by forging, casting or the like for arbitrarily transmitting or blocking the driving force of the engine to the mission or driving wheel side. As shown in FIGS. 6 to 8, the clutch housing 2, the clutch member 4 ′, the pressure member 5 ′, the driving side clutch plate 6 and the driven side clutch plate 7, and the clutch member 4 ′ are provided. Pressure formed on the clutch member side cam surface 4'b and the pressure member 5 ', the pressure member side cam surface 5'b, the clutch member side wall surface 13 provided on the clutch member 4', and the pressure member 5 '. It is mainly comprised from the stopper (reverse rotation side stopper) which consists of the member side wall surface 12. FIG. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and those detailed description is abbreviate | omitted.

  As shown in FIG. 7, the clutch member 4 ′ is formed with a plurality of (three) convex portions protruding toward the pressure member 5 ′, and the inner diameter side of the side surface of each convex portion is the clutch member side cam surface 4. The outer diameter side of the clutch member is a side wall surface 13 of the clutch member. On the other hand, the pressure member 5 'is formed with a pressure member side cam surface 5'b facing the clutch member side cam surface 4'b and a pressure member side wall surface 12 facing the clutch member side wall surface 13, respectively. .

  However, as in the first embodiment, the clutch member side cam surface 4′b and the pressure member side cam surface 5′b constitute a back torque limiter cam, and the back torque limiter cam is a clutch member. 4 'includes a clutch member side cam surface 4'b and a pressure member side cam surface 5'b provided on the pressure member 5', and the rotation of the shaft 3 (output member) is an input member such as the gear 1. When the pressure member 5 'and the clutch member 4' are rotated relative to each other, the pressure is caused by the cam action of the clutch member side cam surface 4'b and the pressure member side cam surface 5'b. The member 5 ′ can be moved in the axial direction to separate the drive side clutch plate 6 and the driven side clutch plate 7 (see FIG. 4).

  Further, the clutch member side wall surface 13 and the pressure member side wall surface 12 constitute a stopper, and the stopper is a pressure member formed on the clutch member side wall surface 13 provided on the clutch member 4 ′ and the pressure member 5 ′. After the drive-side clutch plate 6 and the driven-side clutch plate 7 are separated from each other, the clutch member side wall surface 13 and the pressure member are formed as shown in FIG. When the side wall surface 12 abuts, further relative rotation between the pressure member 5 ′ and the clutch member 4 ′ is restricted, and the movement of the pressure member 5 ′ in the axial direction is restricted. .

  7 and 8, reference numeral 4'd denotes a clutch to be brought into contact with a wall surface (not shown) formed on the pressure member 5 'side after the driving side clutch plate 6 and the driven side clutch plate 7 are in pressure contact. The wall surface formed in the member 4 'side is shown, and when the wall surface 4'd of these clutch members 4' and the wall surface of the pressure member 5 'contact | abut, the said pressure member 4' and clutch member 5 'are shown. It is configured to rotate integrally. The wall surface 4'd formed on the clutch member 4 'and the wall surface formed on the pressure member 5' are referred to as a forward rotation side stopper with respect to the reverse rotation side stopper.

  Further, in the present embodiment, as in the first embodiment, the clutch member side wall surface 13 (same as the pressure member side wall surface 12) constituting the stopper (reverse rotation side stopper) is, as shown in FIG. The opposing surfaces of the member 4 ′ and the pressure member 5 ′ extend in the radial direction, and the extension line T2 in the radial direction is offset by the dimension A from the rotation center L of the pressure member 5 (or the clutch member 4). Is formed. In other words, as shown in FIG. 9, the clutch member side wall surface 13 and the pressure member side wall surface 12 have a radial extension line T2 passing through the rotation center L of the clutch member 4 ′ and the pressure member 5 ′. As a result, the extension line T2 in the radial direction is offset from the rotation center L of the clutch member 4 ′ and the pressure member 5 ′. ing.

  In the present embodiment as well, as in the first embodiment, the clutch member 4 'is formed with a plurality (three) of clutch member side wall surfaces 13 at substantially equal intervals along the circumferential direction, and the pressure is increased. A plurality (three) of pressure member side wall surfaces 12 are formed at substantially equal intervals on the member 5 ′ corresponding to the clutch member side wall surface 13. Further, the clutch member side wall surface 13 and the pressure member side wall surface 12 constituting the stopper (reverse rotation side stopper) are arranged in the axial direction of the clutch member 4 ′ and the pressure member 5 ′ (that is, the clutch member side wall surface 13 and the pressure member side wall surface 12). And an angle a (gradient angle) larger than the gradient angle with respect to the radial straight line T1 passing through the rotation center L of the clutch member 4 ′ and the pressure member 5 ′. Where θ is θ, a = θ + α) extends in an inclined direction.

  According to the present embodiment, as in the first embodiment, the clutch member side wall surface 13 and the pressure member side wall surface 12 of the stopper (reverse rotation side stopper) have diameters on the surfaces facing the clutch member 4 ′ and the pressure member 5 ′. Since the extension line T2 in the radial direction is offset from the rotation center L of the clutch member 4 ′ and the pressure member 5 ′, the back torque limiter cam functions and the drive side clutch After the plate 6 and the driven clutch plate 7 are separated from each other, the movement of the pressure member 5 ′ can be reliably stopped at the position where the clutch member side wall surface 13 and the pressure member side wall surface 12 are in contact with each other.

  Next, another embodiment of the present invention will be described. As shown in FIG. 10, after the driving side clutch plate 6 and the driven side clutch plate 7 are pressed against each other, the stopper side wall surface 14 and the pressure member side wall surface (not shown: wall surface corresponding to the clutch member side wall surface) , The pressure member 5 and the clutch member 4 are integrally rotated, and as in the first and second embodiments, a stopper (forward rotation side) is formed. The clutch member side wall surface 14 (and the pressure member side wall surface) of the stopper) extends in the radial direction on the opposing surface of the clutch member 4 (and the pressure member 5), and the extension line T3 in the radial direction is the clutch member. 4 (and the pressure member 5) may be formed offset from the rotation center L by a dimension B. In FIG. 10, except for the clutch member side wall surface 14, it is substantially the same as that of the first embodiment.

  Furthermore, as shown in FIG. 11, after the driving side clutch plate 6 and the driven side clutch plate 7 are pressed against each other, the stopper member side wall surface 15 and the pressure member side wall surface (not shown: corresponding to the clutch member side wall surface). When the pressure member and the clutch member 4 ′ are rotated together, the pressure member and the clutch member 4 ′ are integrally rotated, and the stopper (normal) is the same as in the first and second embodiments. The clutch member side wall surface 15 (and the pressure member side wall surface) of the rotation side stopper) extends in the radial direction on the opposing surface of the clutch member 4 ′ (and the pressure member), and the extension line T3 in the radial direction is It may be formed by being offset by a dimension B from the rotation center L of the clutch member 4 ′ (and the pressure member 5). In FIG. 11, except for the clutch member side wall surface 15, it is substantially the same as in the second embodiment.

  As shown in FIGS. 10 and 11, after the driving side clutch plate 6 and the driven side clutch plate 7 are in pressure contact, the pressure member (5, 5 ′) and the clutch member (4, 4 ′) are moved by the forward rotation side stopper. ) Is rotated at the position where the clutch member side wall surface (14, 15) and the pressure member side wall surface are in contact with each other. ) Relative movement can be stopped.

  10 and 11, as in the above embodiment, the clutch member side wall surfaces (14, 15) and the pressure member side wall surfaces of the forward rotation side stopper are the clutch member (4, 4 ') and the pressure member ( 5 and 5 ′) and a gradient angle is given to the radial line passing through the rotation center L of the clutch member (4, 4 ′) and the pressure member (5, 5 ′). It is preferable to extend in a direction inclined at an angle larger than the gradient angle. In this case, the pressure member (14, 15) and the pressure member side wall surface are in contact with each other more reliably and accurately. 5, 5 ′) can be stopped.

Next, a power transmission device according to a third embodiment of the present invention will be described.
The power transmission device according to the present embodiment is disposed in a vehicle such as a two-wheeled vehicle and arbitrarily transmits or shuts off the driving force of the engine to the mission or driving wheel side, as shown in FIGS. The clutch housing 2, the clutch member 4, the pressure member 16, the intermediate member 17, the driving side clutch plate 6 and the driven side clutch plate 7, the clutch member side cam surface 4 b provided on the clutch member 4, and the intermediate member Main member side cam surface 17a provided on the clutch member 17 and a stopper (reverse rotation side stopper) comprising a clutch member side wall surface 11 provided on the clutch member 4 and a pressure member side wall surface 10 formed on the pressure member 16. It is configured.

  The intermediate member 17 is formed with a spline groove on the side surface to spline the driven clutch plate 7, and is interposed between the clutch member 4 and the pressure member 16 and rotates together with the clutch member 4 and the pressure member 16. It is possible. As shown in FIG. 14, the pressure member 16 is formed with a fitting protrusion 16 a that can be fitted into the spline groove of the intermediate member 17. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and those detailed description is abbreviate | omitted.

  However, as in the first embodiment, the clutch member side cam surface 4b and the intermediate member side cam surface 17a constitute a back torque limiter cam, and the back torque limiter cam is provided on the clutch member 4. The clutch member-side cam surface 4b and the intermediate member-side cam surface 17a provided on the intermediate member 17, and the rotation of the shaft 3 (output member) exceeds the rotation speed of the input member such as the gear 1, and the pressure member 16 When the intermediate member 17 and the clutch member 4 are relatively rotated, the pressure member 16 and the intermediate member 17 are moved in the axial direction by the cam action of the clutch member side cam surface 4b and the intermediate member side cam surface 17a. The driving side clutch plate 6 and the driven side clutch plate 7 can be separated from each other.

  Further, the clutch member side wall surface 11 and the pressure member side wall surface 10 constitute a reverse rotation side stopper, and the reverse rotation side stopper is formed on the clutch member side wall surface 11 and the pressure member 16 provided in the clutch member 4. The pressure member side wall surface 10 (see FIG. 14), and after the back torque limiter cam functions and the drive side clutch plate 6 and the driven side clutch plate 7 are separated, the clutch member side wall surface 11 and the pressure member are separated. When the side wall surface 10 abuts, the relative rotation between the pressure member 5 and the intermediate member 17 and the clutch member 4 is restricted, and the movement of the pressure member 16 and the intermediate member 17 in the axial direction is restricted. It is supposed to be.

  Reference numeral 4d in the drawing is formed on the side of the clutch member 4 to be brought into contact with the intermediate member side wall surface 17b formed on the intermediate member 17 side after the driving side clutch plate 6 and the driven side clutch plate 7 are in pressure contact. The clutch member side wall surface is shown, and when the clutch member side wall surface 4d and the intermediate member side wall surface 17b come into contact with each other, the pressure member 4, the intermediate member 17, and the clutch member 4 are integrally rotated. Has been. The clutch member side wall surface 4d formed on the clutch member 4 and the intermediate member side wall surface 17b formed on the intermediate member 17 are referred to as a forward rotation side stopper with respect to the reverse rotation side stopper.

  Furthermore, in the present embodiment, as in the first embodiment, the clutch member side wall surface 11 (same as the pressure member side wall surface 10) constituting the stopper (reverse rotation side stopper) is provided between the clutch member 4 and the pressure member 16. The opposing surfaces extend in the radial direction, and an extension line in the radial direction is formed by being offset from the rotation center of the pressure member 16 (or the clutch member 4) by a predetermined dimension. In other words, the clutch member side wall surface 11 and the pressure member side wall surface 10 are in a direction in which the extension line in the radial direction is inclined by a predetermined angle with respect to the radial straight line passing through the rotation center of the clutch member 4 and the pressure member 16. As a result, the extension line in the radial direction is offset from the rotation center of the clutch member 4 and the pressure member 16.

  Also in the present embodiment, as in the first embodiment, the clutch member 4 is formed with a plurality (three) of clutch member side wall surfaces 11 at substantially equal intervals in the circumferential direction, and the pressure member. 16, a plurality (three) of pressure member side wall surfaces 10 are formed at substantially equal intervals corresponding to the clutch member side wall surface 11. Further, the clutch member side wall surface 11 and the pressure member side wall surface 10 constituting the stopper (reverse rotation side stopper) are arranged in the axial direction of the clutch member 4 and the pressure member 16 (that is, the height of the clutch member side wall surface 11 and the pressure member side wall surface 10). A gradient angle with respect to the radial direction), and an angle larger than the gradient angle with respect to the radial line passing through the rotation center of the clutch member 4 and the pressure member 16 (when the gradient angle is θ, a = Θ + α) It extends in the inclined direction.

  According to the present embodiment, as in the first embodiment, the clutch member side wall surface 11 and the pressure member side wall surface 10 of the stopper (reverse rotation side stopper) are radially opposed to the surfaces of the clutch member 4 and the pressure member 16 facing each other. Since the extension line extending in the radial direction is offset from the rotation center of the clutch member 4 and the pressure member 16, the cam for the back torque limiter functions and the drive side clutch plate 6 and the driven side clutch After the plate 7 is separated, the movement of the pressure member 16 and the intermediate member 17 can be reliably stopped at the position where the clutch member side wall surface 11 and the pressure member side wall surface 10 are in contact with each other.

  Furthermore, after the driving side clutch plate 6 and the driven side clutch plate 7 are in pressure contact, the forward rotation side stopper is brought into contact with the clutch member side wall surface 4d and the intermediate member side wall surface 17b, whereby the pressure member 16 and the intermediate member 17 and the clutch member 4 are rotated integrally, and the clutch member side wall surface 4d (and the intermediate member side wall surface 17b) of the forward rotation side stopper is a clutch as in the first and second embodiments. The members 4 (and the intermediate member 17) are formed so as to extend in the radial direction on the opposite surfaces of the member 4 (and the intermediate member 17), and the extension line in the radial direction is offset from the rotation center of the clutch member 4 (and the intermediate member 17) by a predetermined dimension. ing.

  With this configuration, after the driving side clutch plate 6 and the driven side clutch plate 7 are in pressure contact with each other, when the pressure member 16, the intermediate member 17 and the clutch member 4 are integrally rotated by the forward rotation side stopper, the clutch member The relative movement of the pressure member 16 and the intermediate member 17 with respect to the clutch member 4 can be reliably stopped at the position where the side wall surface 4d and the intermediate member side wall surface 17b contact each other.

  Further, the clutch member side wall surface 4d and the intermediate member side wall surface 17b of the forward rotation side stopper are provided with a gradient angle with respect to the axial direction of the clutch member 4 and the intermediate member 17, and the clutch member 4 and the intermediate member 17 are rotated. It is preferable to extend in a direction inclined at an angle larger than the gradient angle with respect to a straight line in the radial direction passing through the center. In this case, the clutch member side wall surface 4d and the intermediate member side wall surface 17b are more reliably and accurately provided. The relative movement of the pressure member 16 and the intermediate member 17 can be stopped at the contacted position.

  As mentioned above, although this embodiment was described, this invention is not limited to these, For example, the clutch member side wall surface and pressure member side wall surface of a stopper are with respect to the radial direction straight line which passes through the rotation center L of a clutch member and a pressure member. And may be extended in a direction inclined at an angle smaller than the gradient angle (θ). Furthermore, in the present embodiment, a back torque limiter cam is provided, but in addition to this, a pressure assist cam (the rotational force input to the gear 1 and the clutch housing 2 is transmitted via the clutch member). When a rotational force is applied to the pressure member in a state where it can be transmitted to the shaft, the cam acts to generate a force in a direction that increases the pressure contact force between the drive side clutch plate 6 and the driven side clutch plate 7). You may have. The power transmission device according to the present invention can be applied to various multi-plate clutch type power transmission devices such as two-wheeled vehicles, automobiles, three-wheel or four-wheel buggies, and general-purpose machines.

  The clutch member side wall surface and the pressure member side wall surface of the stopper extend in the radial direction at the opposing surfaces of the clutch member and the pressure member, and the extension line in the radial direction is offset from the rotation center of the clutch member and the pressure member. As long as the power transmission device is formed as described above, the power transmission device can be applied to a device having a different external shape or a device to which another function is added.

1 Gear (input member)
2 Clutch housing 3 Shaft (output member)
4, 4 'clutch member 4b, 4'b clutch member side cam surface 5, 5' pressure member 5b, 5'b pressure member side cam surface 6 driving side clutch plate 7 driven side clutch plate 8 rivet 9 push rod 10, 12 Pressure member side wall surface 11, 13 Clutch member side wall surface 14, 15 Clutch member side wall surface 16 Pressure member 17 Intermediate member

Claims (9)

A clutch housing that rotates with the rotation of the input member to form a plurality of drive side clutch plates;
A plurality of driven-side clutch plates formed alternately with the driving-side clutch plates of the clutch housing;
A clutch member coupled to the output member;
A pressure member that is attached to the clutch member while being capable of moving in the axial direction of the clutch member, and capable of press-contacting or separating the driving-side clutch plate and the driven-side clutch plate along with the axial movement of the clutch member; ,
A stopper comprising a clutch member side wall surface provided on the clutch member and a pressure member side wall surface formed on the pressure member, wherein the clutch member side wall surface and the pressure member side wall surface can come into contact with each other;
In the power transmission device capable of transmitting or shutting off the rotational force input to the input member by the press contact or separation between the driving side clutch plate and the driven side clutch plate,
The clutch member side wall surface and the pressure member side wall surface of the stopper extend in a radial direction on the surfaces of the clutch member and the pressure member facing each other, and an extension line in the radial direction indicates a rotation center of the clutch member and the pressure member. A power transmission device formed by being offset from a power transmission device. The clutch member-side cam surface provided on the clutch member and the pressure member-side cam surface provided on the pressure member, and the rotation of the output member exceeds the rotational speed of the input member, and the pressure member and the clutch member Is rotated relatively, the pressure member is moved in the axial direction by the cam action of the clutch member side cam surface and the pressure member side cam surface, and the drive side clutch plate and the driven side clutch plate are separated from each other. A back torque limiter cam to obtain,
The stopper is configured such that after the back torque limiter cam functions and the driving clutch plate and the driven clutch plate are separated from each other, the side wall surface of the clutch member and the side wall surface of the pressure member come into contact with each other. 2. The power transmission device according to claim 1, further comprising a reverse-side stopper for restricting further relative rotation between the clutch member and the clutch member to restrict movement of the pressure member in the axial direction.   The stopper rotates the pressure member and the clutch member integrally by contacting the side wall surface of the clutch member and the side wall surface of the pressure member after the driving side clutch plate and the driven side clutch plate are pressed against each other. The power transmission device according to claim 1, comprising a forward rotation side stopper.   The clutch member side wall surface and the pressure member side wall surface of the stopper are provided with a gradient angle with respect to the axial direction of the clutch member and the pressure member, and are linear in the radial direction passing through the rotation centers of the clutch member and the pressure member. The power transmission device according to any one of claims 1 to 3, wherein the power transmission device is extended in a direction inclined at an angle larger than the gradient angle.   A plurality of the clutch member side wall surfaces are formed at substantially equal intervals along the circumferential direction of the clutch member, and the pressure member side wall surface is substantially corresponding to the clutch member side wall surface on the pressure member. The power transmission device according to claim 1, wherein a plurality of the power transmission devices are formed at equal intervals. A clutch housing that rotates with the rotation of the input member to form a plurality of drive side clutch plates;
A plurality of driven-side clutch plates formed alternately with the driving-side clutch plates of the clutch housing;
A clutch member coupled to the output member;
A pressure member that is attached to the clutch member while being capable of moving in the axial direction of the clutch member, and capable of press-contacting or separating the driving-side clutch plate and the driven-side clutch plate along with the axial movement of the clutch member; ,
An intermediate member that splines the driven clutch plate and is interposed between the clutch member and the pressure member and can rotate together with the clutch member and the pressure member;
The clutch member-side cam surface provided on the clutch member and the intermediate member-side cam surface provided on the intermediate member, the rotation of the output member exceeds the rotational speed of the input member, and the intermediate member and the clutch member Is rotated relatively, the intermediate member is moved in the axial direction by the cam action of the clutch member side cam surface and the intermediate member side cam surface, and the driving side clutch plate and the driven side clutch plate are separated from each other. A back torque limiter cam to obtain,
The clutch member has a side wall surface provided on the clutch member and a pressure member side wall surface formed on the pressure member. The clutch member side wall surface and the pressure member side wall surface can be brought into contact with each other, and the back torque After the cam for limiter functions and the drive side clutch plate and the driven side clutch plate are separated, the side wall surface of the clutch member and the side wall surface of the pressure member come into contact with each other, so that the gap between the intermediate member and the clutch member is A reverse-side stopper that restricts further relative rotation and restricts movement of the intermediate member in the axial direction;
In the power transmission device capable of transmitting or shutting off the rotational force input to the input member by the press contact or separation between the driving side clutch plate and the driven side clutch plate,
The clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper extend in the radial direction on the surfaces facing the clutch member and the pressure member, and the extension line in the radial direction of the clutch member and the pressure member. A power transmission device formed by being offset from a rotation center.   The clutch member side wall surface and the pressure member side wall surface of the reverse rotation side stopper are given a gradient angle with respect to the axial direction of the clutch member and the pressure member, and the radial direction passes through the rotation center of the clutch member and the pressure member. The power transmission device according to claim 6, wherein the power transmission device extends in a direction inclined at an angle larger than the gradient angle with respect to the straight line. A clutch housing that rotates with the rotation of the input member to form a plurality of drive side clutch plates;
A plurality of driven-side clutch plates formed alternately with the driving-side clutch plates of the clutch housing;
A clutch member coupled to the output member;
A pressure member that is attached to the clutch member while being capable of moving in the axial direction of the clutch member, and capable of press-contacting or separating the driving-side clutch plate and the driven-side clutch plate along with the axial movement of the clutch member; ,
An intermediate member that splines the driven clutch plate and is interposed between the clutch member and the pressure member and can rotate together with the clutch member and the pressure member;
The clutch member side wall surface provided on the clutch member and the intermediate member side wall surface formed on the intermediate member are configured such that the clutch member side wall surface and the intermediate member side wall surface can come into contact with each other. After the clutch plate and the driven-side clutch plate are in pressure contact, the clutch member side wall surface and the intermediate member side wall surface come into contact with each other, thereby rotating the intermediate member and the clutch member integrally,
In the power transmission device capable of transmitting or shutting off the rotational force input to the input member by the press contact or separation between the driving side clutch plate and the driven side clutch plate,
The clutch member side wall surface and the intermediate member side wall surface of the forward rotation side stopper extend in a radial direction on the surfaces of the clutch member and the intermediate member facing each other, and an extension line in the radial direction indicates the clutch member and the intermediate member. A power transmission device formed by being offset from the rotation center of the motor.   The clutch member side wall surface and the intermediate member side wall surface of the forward rotation side stopper are given a gradient angle with respect to the axial direction of the clutch member and the intermediate member, and have a diameter passing through the rotation center of the clutch member and the intermediate member. The power transmission device according to claim 8, wherein the power transmission device extends in a direction inclined at an angle larger than the gradient angle with respect to a straight line in the direction.

Images