WO2007007538A1

WO2007007538A1 - Power transmission device

Info

Publication number: WO2007007538A1
Application number: PCT/JP2006/312703
Authority: WO
Inventors: Makoto Kataoka; Shigeki Kawashima
Original assignee: Kabushiki Kaisha F.C.C.
Priority date: 2005-07-14
Filing date: 2006-06-26
Publication date: 2007-01-18
Also published as: JP2007024134A; JP4364170B2

Abstract

[PROBLEMS] To provide a power transmission device manufacturable at low cost and enabling the suppression of an increase in the number of parts, simplification of a device configuration, and a reduction in size as compared with the magnitude of a transmission torque. [MEANS FOR SOLVING PROBLEMS] This power transmission device comprises a clutch housing (2), a clutch member (4) having a spline (10) axially formed on the outer peripheral surface thereof, and a pressure member (5). A first sloped surface (10ba) is formed at the pressure member (5) mounting side end part of the projected part (10b) of the spline (10), and a second sloped surface (5b) corresponding to the first sloped surface (10ba) is formed on the pressure member (5). When these first sloped surface (10ba) and the second sloped surface (5b) form a cam for a back torque limiter which, when the rotational speed of an output member exceeds the rotational speed of an input member, separate drive side clutch discs (6) from driven side clutch discs (7).

Description

Specification

Power transmission device

Technical field

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

Background art

[0002] In general, a power transmission device provided in a motorcycle is for arbitrarily transmitting or blocking driving force of an engine and a transmission to a driving wheel. An input member connected to the engine and the transmission side; It has an output member connected to the drive wheel side and a clutch member connected to the output member, and transmits power by pressing the plurality of drive side clutch plates and driven side clutch plates together. The transmission of the power is cut off by separating (releasing the pressure contact force).

[0003] However, when a so-called back torque is generated when the rotation of the output member exceeds the rotation speed of the input member, a back torque limiter function that separates both clutch plates should be added to the vicinity of the shaft as the output member. A technique for disposing a cam member is disclosed (for example, see Patent Document 1). According to the conventional power transmission device that works, a cam member is disposed between the shaft and the clutch member, and when a knock torque is generated, the cam member acts on the drive side clutch plate. The back torque can be absorbed by moving the pressure member in the direction away from the driven clutch plate (the direction in which the pressure contact force is released).

Patent Document 1: Japanese Patent Laid-Open No. 2-150517

Disclosure of the invention

Problems to be solved by the invention

[0004] However, in the conventional power transmission device, since the cam member for the knock torque limiter is disposed near the shaft as the output member, the cam member has a cam surface. There was a possibility that the applied surface pressure would be excessive. Therefore, the cam member must be made of a highly rigid material such as a forged product so that it can withstand such an excessive surface pressure. However, when such a component is used, the entire device becomes expensive. The problem is that It was. In addition, the addition of a cam member increases the number of parts of the device, complicates the device configuration, and reduces the workability during assembly, resulting in a low manufacturing cost. There was also a problem that I was hesitant.

[0005] Accordingly, since the clutch member in the conventional power transmission device is formed with a spline that fits with the driven clutch plate in the axial direction of the outer peripheral side surface, We studied to provide a knock torque limiter function by using the spline of the clutch member formed.

[0006] The present invention has been made in view of such circumstances, and can reduce the manufacturing cost of the apparatus, suppress the increase in the number of parts, simplify the apparatus configuration, and the magnitude of the transmission torque. An object of the present invention is to provide a power transmission device that can be miniaturized.

Means for solving the problem

[0007] The invention of claim 1 is characterized in that a clutch housing that is rotated with the rotation of the input member and formed with a plurality of drive side clutch plates, and a spline having a concavo-convex shape force is formed in the axial direction of the outer peripheral side surface A plurality of driven-side clutch plates that are formed alternately with the drive-side clutch plates of the clutch housing and are fitted to the spline, and are movable in the axial direction of the clutch member connected to the output member and the clutch member And a pressure member that is attached to the clutch member and capable of pressing or separating the drive-side clutch plate and the driven-side clutch plate as the clutch member moves in the axial direction, and the drive-side clutch plate A power transmission device capable of transmitting or shutting off the rotational force input to the input member to the output member by being pressed against or separated from the driven clutch plate. And forming a first gradient surface at the pressure member mounting side end of the convex portion forming the spline formed in the clutch member, and forming a second gradient surface corresponding to the first gradient surface on the pressure member. The first slope surface and the second slope surface are knocks that cause the drive-side clutch plate and the driven-side clutch plate to be separated when the rotation of the output member exceeds the rotation speed of the input member. A torque limiter cam is configured. The invention's effect

[0008] According to the invention of claim 1, the first slope surface is formed at the pressure member mounting side end of the convex portion forming the spline formed in the clutch member, and the pressure member is (1) The second gradient surface corresponding to the gradient surface is formed, and the first gradient surface and the second gradient surface force S buckle limiter cam are configured, so that the manufacturing cost of the device can be reduced and the increase in the number of parts is suppressed. In addition, the device configuration can be simplified and the size can be reduced in terms of the transmission torque.

[0009] In addition, since a plurality of convex portions are formed uniformly over the entire circumference of the spline formed on the outer peripheral side surface of the clutch member, the pressure member mounting side end portions of all the convex portions are provided. By forming the first slope surface, a large number of knock torque limiter cams can be formed substantially uniformly in the circumferential direction of the clutch member, and the surface pressure applied when the back torque is generated can be efficiently dispersed. .

BEST MODE FOR CARRYING OUT THE INVENTION

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 disposed in a vehicle such as a two-wheeled vehicle, and is used to arbitrarily transmit or shut off the driving force of the engine or the mission to the driving wheel side. As shown, the clutch housing 2 in which the gear 1 as an input member is formed, the clutch member 4 connected to the shaft 3 as an output member, and the clutch member 4 are attached to the right end side in the figure. The pressure member 5 mainly includes a driving side clutch plate 6 connected to the clutch housing 2 side and a driven side clutch plate 7 connected to the clutch member 4 side.

[0011] The gear 1 is rotatable about the shaft 3 when a driving force (rotational force) to which the engine force is also transmitted is input, and is connected to the clutch housing 2 by a rivet 8 or the like. The clutch housing 2 is also formed as a cylindrical case member having an opening on the right end side in the figure, and a plurality of drive side clutch plates 6 are formed on the inner peripheral wall force. Each of the driving-side clutch plates 6 that is applied includes a plate member formed in a substantially annular shape, and is configured to rotate with the rotation of the clutch housing 2.

The clutch member 4 also includes a cylindrical case member that is disposed in the clutch housing 2 and that is open on the right end side in FIG. The shaft 3 is connected to the substantially center of the clutch member 4 by spline fitting while penetrating, and the shaft 3 is also rotated when the clutch member 4 is rotated. A spline 10 extending in the axial direction (left-right direction in the figure) is formed on the outer peripheral side surface of the clutch member 4, and the spline 10 is covered with the spline 10. The moving side clutch plate 7 is fitted and formed.

More specifically, as shown in FIG. 2, the spline 10 formed on the clutch member 4 has a concavo-convex shape (concave groove 10a formed integrally over substantially the entire circumference on the outer peripheral side surface thereof. And the convex portion 10b) force is also configured, and when the driven clutch plate 7 is fitted in the concave groove 10a, the movement of the driven clutch plate 7 in the rotational direction is allowed while allowing the axial movement of the driven clutch plate 7 with respect to the clutch member 4. It is restricted and can be rotated together with the clutch member 4.

[0014] The driven clutch plates 7 are alternately laminated with the drive-side clutch plates 6 so that the adjacent clutch plates 6 and 7 can be pressed against or separated from each other. That is, the clutch plates 6 and 7 are allowed to slide in the axial direction of the clutch member 4 and are pressed against each other when pressed by the pressure member 5 in the left direction in FIG. Is transmitted to the clutch member 4 and the shaft 3, and when the pressure member 5 releases the pressure, the clutch member 4 stops and stops following the rotation of the clutch housing 2, and transmits the rotational force to the shaft 3. Will not be done.

[0015] It should be noted that the separation of the clutch plates 6 and 7 here means that the clearance between the clutch plates 6 and 7 need not be in a state where there is no physical clearance. It also includes a state in which the pressure contact force is released and the clutch member 4 no longer follows the rotation of the clutch housing 2 (that is, a state in which the drive side clutch plate 6 slides on the driven side clutch plate 7).

[0016] The pressure member 5 is formed in a substantially disk shape so as to close the opening (right end in the figure) of the clutch member 4, and is always urged leftward in the figure by the clutch spring S. . In other words, the clutch member 4 is formed with a boss portion 4b extending and penetrating to the pressure member 5 side. The boss portion 4b allows the clutch bolt B to pass therethrough and the clutch bolt B to be applied to the head portion side. By interposing the clutch spring S between the pressure member 5 and the pressure member 5, the pressure member 5 is always urged to the left.

On the other hand, the edge portion 5a of the pressure member 5 is in contact with the rightmost portion in the figure in which the driving side clutch plate 6 and the driven side clutch 7 are stacked, and both clutches are applied by the urging force of the clutch spring S. Plates 6 and 7 are in pressure contact. Therefore, 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. [0018] 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 is moved 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 right direction, the pressure contact force between the drive 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 enters the clutch member 4 in a separated state. And it is blocked without being transmitted to shaft 3. That is, the pressure member 5 is configured to be able to press or separate the driving side clutch plate 6 and the driven side clutch plate 7 with the movement of the clutch member 4 in the axial direction.

[0019] Here, the spline 10 of the clutch member 4 according to the present embodiment has a first inclined surface lOba at the pressure member 5 attachment side end (opening end of the clutch member 4) of the convex portion 10b. The pressure member 5 is formed with a second slope surface 5b corresponding to the first slope surface lOba, and the first slope surface lOba and the second slope surface 5b are cams for the back torque limiter. Is configured.

That is, when the rotation of the shaft 3 exceeds the rotation speed of the gear 1 and the clutch housing 2, the back torque in the direction b shown in FIG. 3 (torque in the direction opposite to the forward rotation direction a of the clutch member 4) When this occurs, as shown in FIG. 4, the first inclined surface lOba and the second inclined surface 5b coincide with each other and the knock torque limiter cam acts to cause the pressure member 5 to move in the direction c in FIG. Clutch capacity decreases due to movement to the c direction or separation of the drive side clutch plate 6 and driven side clutch plate 7 by generating a force in the c direction, or the spring load by the clutch spring S being reduced by the load in the c direction. Is starting to do. As a result, problems with the power transmission device and power source (engine side) due to knock torque can be avoided.

As described above, since the back torque limiter cam is formed on the convex portion 10b of the spline 10 located on the outer peripheral side surface of the clutch member 4, the cam member having the above function is arranged in the vicinity of the shaft 3 as in the prior art. The surface pressure applied to the cam surface can be reduced compared with the installed one, and an excessive load can be avoided. This eliminates the need for separate parts such as forgings, reduces manufacturing costs, and reduces the number of parts. Note that the size of the transmission torque is reduced (i.e., the same transmission torque Can be reduced).

[0022] In addition, a slope surface (first slope surface lOba) is formed at the end of the pressure member 5 mounting side of the projection 10b of the spline 10 that has been conventionally formed, and a corresponding slope surface (second surface). The knock torque limiter function can be achieved simply by forming the sloped surface 5b) on the pressure member 5, so that a new back torque limiter cam is applied to the existing power transmission device. In this case, it is not necessary to add a separate process for improving the rigidity. Therefore, it is possible to achieve an effect that the present invention can be easily applied to an existing power transmission device.

[0023] Furthermore, the spline 10 formed on the outer peripheral side surface of the clutch member 4 is formed with a plurality of convex portions 10b uniformly over substantially the entire circumference! Therefore, the pressure of all the convex portions 10b is reduced. By forming the first slope surface lOba at the end of the component 5 attachment side, a large number of knock torque limiter cams can be formed substantially evenly in the circumferential direction of the clutch member 4 and applied when knock torque is generated. The surface pressure can be efficiently dispersed.

As described above, the force described in the present embodiment is not limited to this. For example, the conventional spline 10 is formed on the outer peripheral side surface of the clutch member 4 as in the prior art, and the convex portion 10b of the spline 10 is formed. The first pressure surface lOba may be formed by subjecting the pressure member 5 to the end on the mounting side by subjecting it to another processing (cutting or the like). Of course, from the viewpoint of reducing the manufacturing process, a profile for forming the first slope surface lOba is formed in the mold of the clutch member 4, and the first slope surface lOba is integrally formed when the clutch member 4 is built. It is preferable to do so. Furthermore, the power transmission device of 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.

Industrial applicability

[0025] A first slope surface is formed on the pressure member mounting side end of the convex portion forming the spline formed in the clutch member, and a second gradient surface corresponding to the first slope surface is formed on the pressure member. The first gradient surface and the second gradient surface cause a back torque limiter cam to separate the drive side clutch plate and the driven side clutch plate when the rotation of the output member exceeds the rotation speed of the input member. If it is a power transmission device that constitutes Alternatively, the present invention can be applied to ones having different external shapes.

Brief Description of Drawings

FIG. 1 is a longitudinal sectional view showing a power transmission device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a clutch member in the power transmission device.

FIG. 3 is a schematic diagram showing the relationship with the pressure member during forward rotation of the clutch member in the power transmission device.

FIG. 4 is a schematic diagram showing the relationship with the pressure member when the clutch member is reversely rotated (with back torque applied) in the power transmission device.

Explanation of symbols

1 Gear (input member)

2 Clutch housing

3 Shaft (output member)

4 Clutch member

4a recess

5 Pressure

5b 2nd slope surface (cam for back torque limiter)

6 Drive side clutch plate

7 Driven clutch plate

8 rivets

9 Push rod

10 splines

10a Concave groove (composing spline)

10b Convex part (composing spline)

lOba 1st slope surface (back torque limiter cam)

S Clutch spring

B Clutch Bonore

Claims

The scope of the claims

A clutch housing that rotates with the rotation of the input member to form a plurality of drive side clutch plates;

A spline having a concavo-convex shape force is formed in the axial direction of the outer peripheral side surface, and has a plurality of driven side clutch plates that are alternately formed with the driving side clutch plates of the clutch housing and are fitted to the splines, and an output member A clutch member connected to

The clutch member is attached to the clutch member while being able to move in the axial direction, and the drive side clutch plate and the driven side clutch plate can be pressed against or separated from each other as the clutch member moves in the axial direction. A pressure member;

In the power transmission device, the rotational force input to the input member can be transmitted to or shut off from the output member by the pressure contact or separation between the drive side clutch plate and the driven side clutch plate. A first slope surface is formed at the pressure member mounting side end of the convex portion forming the spline, and a second slope surface corresponding to the first slope surface is formed on the pressure member. The surface and the second slope surface constitute a knock torque limiter cam that separates the drive side clutch plate and the driven side clutch plate when the rotation of the output member exceeds the rotation speed of the input member. A power transmission device characterized by that.