JPH11247883A - Clutch lifter cam plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost by summerizing the number of part items and to simplify a manufacturing process by saving trouble of connecting work, etc., at the time of manufacturing a clutch lifter cam plate which is a part of a clutch mechanism of a vehicle. SOLUTION: A large diametrical cylinder part 16t molded by redrawing work on one end side of a clutch lifter cam plate 16 is fitted on a guide member 18 of a lifter support shaft 17 free to revolve and free to slide in the axial direction, a cam surface 16c molded on the outside of the large diametrical cylinder part 16t is made contact with a roller 19, a small diametrical cylinder part is integrally molded by a plural number of stages of drawing work on a bottom face of the large diametrical cylinder part 16t, and a bearing is fitted on an outer periphery of this small diametrical cylinder part. Additionally, a connecting hole 16r to which a clutch operation side member is connected is formed on the other end side of the clutch lifter cam plate 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch lifter cam plate for a vehicle clutch mechanism.

[0002]

2. Description of the Related Art Conventionally, as a clutch mechanism of a motorcycle or the like, a drive transmission is connected by controlling the contact or non-contact of a clutch disk on a clutch outer side and a clutch plate on a clutch center side by movement of a pressure plate. Alternatively, a type that shuts off is known, and in such a type of clutch mechanism, a clutch lifter cam plate may be provided to move the pressure plate.

[0003] This clutch lifter cam plate 51
For example, as shown in FIG. 8, a cam plate 52 having a cylindrical portion 52t and a cam surface 52c formed at one end and a connecting portion 52r such as an operation lever formed at the other end, and a cylindrical portion of the cam plate. The bottom surface of 52t is provided with a lifter pin 53 which is connected to the bottom surface of the cam plate by caulking or the like. The cylindrical portion 52t of the cam plate is fitted to a lifter support shaft (not shown), and the lifter pin 53 is connected via a bearing (not shown). When the cam plate 52 is rotated around the lifter support shaft via a connecting portion 52r by an operation lever or the like and connected to the pressure plate side, a clutch lifter cam plate is formed by the action of a cam surface 52c formed around the cylindrical portion 52t. 51 slides in the axial direction of the lifter support shaft, and simultaneously allows the pressure plate to move in the same direction.

[0004]

However, since the conventional clutch lifter cam plate 51 is composed of two parts, the cam plate 52 and the lifter pin 53, the manufacturing cost is high and the two must be connected by caulking or the like. Therefore, there is a problem that manufacturing is complicated and time-consuming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the manufacturing cost by consolidating the number of parts and to simplify the manufacturing process by eliminating labor such as joining work. .

[0006]

According to the present invention, in order to achieve the above object, the present invention is characterized in that, according to the first aspect, the clutch is turned around a lifter support shaft by a clutch operation, and at this time, the cam mechanism moves along the axial direction of the lifter support shaft. In the clutch lifter cam plate which can be moved by moving, a connecting portion to which the clutch operation side member is connected and a cam surface which is a part of a cam mechanism are integrally provided, and a plurality of throttles are provided inside the cam surface. A large-diameter cylindrical part formed by processing and a small-diameter cylindrical part formed by multiple stages of drawing on the bottom surface of the large-diameter cylindrical part are integrally connected, and the large-diameter cylindrical part is fitted to the lifter support shaft side. It was made possible.

As described above, a large-diameter cylindrical portion is formed inside the cam surface by a plurality of stages of drawing, and a small-diameter cylindrical portion formed by a plurality of stages of drawing is connected to the bottom surface of the large-diameter cylindrical portion. In addition, the conventional cam plate and the lifter pin are integrated with each other, so that the labor such as a joining operation can be omitted. Also, by integrally molding, the breaking load is increased as compared with the conventional crimping or the like, and the reliability can be improved.

According to a second aspect of the present invention, in the final step of drawing the small-diameter cylindrical portion in a plurality of stages, the shoulder of the die of the die into which the small-diameter cylindrical portion is fitted is made substantially right-angled, and the diameter of the die is reduced. The outer diameter is slightly larger than the outer diameter and the diameter of the punch is larger than the inner diameter of the small-diameter cylindrical portion. In this way, if the shoulder of the die is made substantially perpendicular, the diameter of the die is made larger than the outer diameter of the small-diameter cylinder, and the diameter of the punch is set to be larger than the inner diameter of the small-diameter cylinder, then the small-diameter cylinder is formed. The radius of the root between the outer peripheral surface and the bottom surface of the large-diameter cylindrical portion can be reduced, and interference between the root and the bearing inner race fitted thereto can be avoided.

That is, when sequentially narrowing the small-diameter cylindrical portion by a plurality of stages of drawing, the depth is increased while moving the radial thickness in the depth direction. Drawing using a mold smaller than the outer diameter of the part,
If a die with a small diameter is used until the end, the excess thickness of the outer peripheral surface of the small-diameter cylindrical portion will be formed in a state where it is collected at the base of the large-diameter cylindrical portion and this will cause peeling and cracking. It causes the occurrence. Therefore, in the final stage of drawing of the small-diameter cylindrical portion, the diameter of the die is made larger than the outer diameter of the small-diameter cylindrical portion, the diameter of the punch is made larger than the inner diameter of the small-diameter cylindrical portion, and the shoulder of the die is formed at a substantially right angle. By doing so, the radius of the root between the outer peripheral surface of the small-diameter cylindrical portion and the bottom surface of the large-diameter cylindrical portion is finally reduced.

According to a third aspect of the present invention, a bearing race is fitted on the outer periphery of the small-diameter cylindrical portion. If the bearing race is fitted on the outer periphery of the small-diameter cylindrical portion in this manner, it can be used in a form corresponding to a clutch mechanism having a conventional structure.

[0011]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is an explanatory view of a clutch mechanism to which the clutch lifter cam plate according to the present invention is applied, FIG. 2 is a plan view of the clutch lifter cam plate, FIG. 3 is a sectional view taken along line AA of FIG. FIG. 5 is a partially enlarged view of FIG. 3, FIG. 5 is a sectional view taken along line BB of FIG. 2, and FIG. 6 is an explanatory view of a forming process of a clutch lifter cam plate.

The clutch lifter cam plate according to the present invention is applied to a clutch mechanism 1 of a vehicle as shown in FIG. 1, and this clutch mechanism 1 interrupts or transmits the rotation of a drive shaft 2 to a main shaft 3. A driven gear 5 meshed with the drive gear 4 on the drive shaft 2 side, a clutch outer 6 integrally connected to the driven gear 5 and having the main shaft 3 rotatably inserted therethrough, and a main shaft 3 A clutch center 7 that is non-rotatably connected and a slide plate 9 that is connected to the clutch center 7 by a connection bolt 8 and that is slidable in the axial direction of the main shaft 3 are provided. Clutch center 7
And is urged rightward in the figure by a compression spring 11 interposed therebetween.

A pressure plate 12 slidable in the axial direction of the main shaft 3 is integrally connected to the slide plate 9. When the pressure plate 12 is moved to the right in FIG. Disc 13 which non-rotatably engages with the clutch center 7 and clutch plate 1 which non-rotatably engages with the clutch center 7
When the pressure plate 12 is moved to the left in the drawing, the clutch disc 13 and the clutch plate 14 are brought into contact with each other. Away,
The transmission of the rotation of the clutch outer 6 to the clutch center 7 is cut off.

An outer race of a bearing 15 is fixed to the slide plate 9, and a clutch lifter cam plate 16 according to the present invention is fitted to an inner race of the bearing 15. The slide plate 9 is slid left and right by the left and right movement of the slide plate 16.

The clutch lifter cam plate 16
As will be described later, a small-diameter cylindrical portion 16s fitted to the inner race of the bearing 15, a large-diameter cylindrical portion 16t around the small-diameter cylindrical portion 16s, and a cam surface 16c around the large-diameter cylindrical portion 16t are formed. The large-diameter cylindrical portion 16t is fitted to a guide member 18 of a lifter support shaft 17 so as to be rotatable and slidable in the axial direction. A roller 19 is fixed to a predetermined portion of the guide member 18, and the roller 19 is in contact with a cam surface 16 c of the clutch lifter cam plate 16.

On the other end of the clutch lifter cam plate 16, a connecting hole 16r is provided as a connecting portion to which a clutch lever or the like (not shown) is connected. The clutch lifter cam plate 16 is connected to the lifter support shaft 17.
Are rotated around the central axis of

As shown in FIGS. 2 to 5, the cam surface 16c of the clutch lifter cam plate 16 is formed on a circumferential surface surrounding the periphery of the large-diameter cylindrical portion 16t, and formed at a plurality of positions in the circumferential direction. V groove (FIG. 5). By rotating the clutch lifter cam plate 16, the roller 19 comes in and out of the V groove of the cam surface 16 c, and when the roller 19 enters the V groove, the clutch lifter cam plate 16 moves rightward, Is released from the V groove, the clutch lifter cam plate 16 is pushed by the roller 19 and moves to the left in the figure. When it moves to the left, the pressure plate 12 also slides to the left via the slide plate 9 to interrupt the transmission of power.

Incidentally, the clutch lifter cam plate 16 is integrally formed as a whole. A method of manufacturing the clutch lifter cam plate 16 will be described. First, the small diameter cylindrical portion 16s is formed by a plurality of stages of drawing. That is, as shown in FIG. 6A, starting from drawing with a large inner diameter Di and a shallow depth, at an intermediate stage of a plurality of stages, as shown in FIG. In the final stage, as shown in FIG. 6C, a small-diameter cylindrical portion 16s having a small inner diameter Di and a large depth is formed. At this time, the outer diameter is formed so as to gradually decrease in accordance with the inner diameter Di.

By the way, as shown in FIG. 7 (A), the die 2 in which the diameter Dd of the die is smaller than the outer diameter Do of the small-diameter cylindrical portion 16s in one step before the final step.
In the final stage, as shown in FIG. 7B, the die diameter Dd is larger than the outer diameter Do of the small-diameter cylindrical portion 16s, and the small-diameter cylindrical portion 16s is formed. Punch diameter Pd is larger than inner diameter Di, and die shoulder a
Is near a right angle (the radius is 0.1 in the embodiment).
Processed using

This aims at increasing the depth by moving the radial wall of the small-diameter cylindrical portion 16s in the depth direction up to one stage before the final stage while moving the wall in the depth direction. In the final stage, the radius of the root b of the outer peripheral surface of the small-diameter cylindrical portion 16s is reduced (the radius is 0.2 or less in the embodiment) to prevent interference when the inner race of the bearing 15 is fitted. On the other hand, it is necessary to prevent the flesh of the outer peripheral surface of the small-diameter cylindrical portion 16s from being cut off and accumulated in the root portion.

That is, in order to reduce the radius of the root b of the outer peripheral surface of the small-diameter cylindrical portion 16s, the radius of the shoulder a of the die must be reduced. As shown in FIG.
The flesh of the outer peripheral surface of s is shaved off and accumulates at the location indicated by the broken line, which causes peeling, cracks and the like. Accordingly, as shown in FIG. 7B, the die diameter Dd is set to be larger than the outer diameter Do of the small-diameter cylindrical portion 16s, and the punch diameter Pd is set to be larger than the inner diameter Di of the small-diameter cylindrical portion 16s. By doing so, the flesh of the outer peripheral surface of the small-diameter cylindrical portion 16s is not cut off, and the radius of the root portion b can be reduced.

In the embodiment, FIGS.
The small-diameter cylindrical portion 16 is drawn through a total of 10 or more steps until (c).
s is formed. And the small-diameter cylindrical part 16s
Is completed, the large-diameter cylindrical portion 16t is formed by a plurality of stages of drawing. Also in this case, the diameter of the initial large-diameter cylindrical portion is made large and the depth is made shallow, and the diameter is made small and the depth is made deeper in order to finally make the large-diameter tube as shown in FIG. The cylindrical portion 16t is formed. At this time, in the embodiment, the drawing process of the large-diameter cylindrical portion 16t is performed in four steps. When the multistage drawing of the large-diameter cylindrical portion 16t is completed, as shown in FIG. 6E, the cam surface 16c of the V-groove is provided at a predetermined position (three positions in the embodiment) around the large-diameter cylindrical portion 16t. It is formed and the connection hole 16r is punched. Then, a series of processing as described above is performed by progressive molding using, for example, a progressive die.

By the above-described forming method, the clutch lifter cam plate, which has conventionally been caulked to two parts, can be integrally formed, and can be manufactured at a lower cost than before, and can be formed with the outer peripheral surface of the small diameter cylindrical portion 16s. Diameter tube part 16t
The radius of the root b at the boundary of the bottom surface can be reduced, and there is no problem of interference when the bearing 15 is fitted to the inner race. Moreover, since the whole is formed by press drawing, the mechanical strength is increased, and the reliability can be improved as compared with the conventional crimping or the like.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the member to which the large-diameter cylindrical portion 16t fits may be in a form to fit directly to the lifter support shaft 17 other than the guide member 18. Further, the shape of the cam surface 16c, the form of the connecting portion, and the like are also arbitrary.

[0025]

As described above, in the clutch lifter cam plate according to the present invention, the connecting portion to which the clutch operation side member is connected and the cam surface which is a part of the cam mechanism are integrally formed. Inside the cam surface, a large-diameter cylindrical part formed by multi-stage drawing and a small-diameter cylindrical part formed by multi-stage drawing on the bottom surface of the large-diameter cylindrical part are integrally connected. As a result, the conventional cam plate and the lifter pin can be formed in an integrated form, so that the time and labor for the joining operation and the like can be reduced, and the manufacturing can be performed at low cost. Further, by integrally molding, the breaking load is increased as compared with the conventional crimping or the like, and the reliability can be improved.

In the final step of drawing the small-diameter cylindrical portion in a plurality of stages, the shoulder of the die of the die into which the small-diameter cylindrical portion is fitted is made substantially right angle, and the diameter of the die is reduced to the small-diameter cylindrical portion. If the diameter of the punch is slightly larger than the outer diameter of the part and the diameter of the punch is larger than the inner diameter of the small-diameter cylinder, the member to be fitted to the outer peripheral surface of the small-diameter cylinder can be fitted tightly. Accuracy can be improved. If a bearing race is fitted on the outer periphery of the small-diameter cylindrical portion as in claim 3, it can be used in a form corresponding to a clutch mechanism having a conventional structure.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a clutch mechanism to which a clutch lifter cam plate according to the present invention is applied;

FIG. 2 is a plan view of a clutch lifter cam plate.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a partially enlarged view of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 2;

FIG. 6 is an explanatory diagram of a forming process of a clutch lifter cam plate.

FIGS. 7A and 7B are explanatory diagrams showing a relationship between a plurality of stages of drawing dies of a small-diameter cylindrical portion and a diameter of the small-diameter cylindrical portion, wherein FIG. 7A shows a state up to one stage before a final stage, and FIG. State diagram of

FIG. 8 is an explanatory view of a conventional clutch lifter cam plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Clutch mechanism, 16 ... Clutch lifter cam plate, 16c ... Cam surface, 16r ... Connection hole, 16s ... Small diameter cylinder part, 16t ... Large diameter cylinder part, 17 ... Lifter support shaft, 21 ...
Mold, a: shoulder, b: base.

Continued on the front page (72) Inventor Akira Kasugai 50-18 Shoji, Igaya-cho, Kariya-shi, Aichi Prefecture Inside Sanyo Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A clutch lifter cam plate, which is rotated around a lifter support shaft by a clutch operation and is movable along an axial direction of the lifter support shaft by a cam mechanism. And a cam surface that becomes a part of the cam mechanism, and a large-diameter cylindrical portion formed by a plurality of stages of drawing, inside the cam surface, A clutch lifter cam plate characterized in that a small-diameter cylindrical portion formed by a plurality of stages of drawing processing is integrally connected to the bottom surface of the portion, and the large-diameter cylindrical portion can be fitted to the lifter support shaft side. . 2. The clutch lifter cam plate according to claim 1, wherein, in a final step of drawing the small-diameter cylindrical portion in a plurality of stages, a shoulder of a die of a die into which the small-diameter cylindrical portion is fitted is made substantially right-angled, A clutch lifter cam plate characterized in that the diameter of the die is slightly larger than the outer diameter of the small-diameter tube portion and the diameter of the punch is larger than the inner diameter of the small-diameter tube portion. 3. The clutch lifter cam plate according to claim 1, wherein a bearing race is fitted on an outer periphery of the small-diameter cylindrical portion.