JPH0732991Y2 - Change clutch release device for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a change clutch release device for a motorcycle, in which a change clutch is opened when a transmission gear mechanism is changed.

(Prior Art) A transmission gear mechanism is incorporated in a power transmission system of an engine of a motorcycle so that a required gear shift range can be selected. When the transmission gear mechanism is changed, the power transmission is cut off by using a change clutch so that the operation becomes smooth.

Various mechanisms are used for the release device for opening the change clutch, but many of them are operated via a release lever pivotally supported on the inner surface of the clutch cover (Japanese Patent Laid-Open No. 61-
(256026 publication).

FIG. 4 shows an example of the release lever support structure.

A boss b is formed on the inner surface of the clutch cover a, and a support shaft c passing through the boss b from the inside of the cover is fastened and fixed by a fastening nut d. The tip of the support shaft c is a screw g, which is screwed onto the back surface of the support fork e to support it. A release lever f is swingably supported on a support fork e, one end of the release lever f is brought into contact with the bush piece h of the change clutch, and the other end thereof is brought into contact with the release piece i. When the release piece i is pushed out, the release lever f swings and pushes the bush piece h to open the change clutch.

In order to adjust the feel or response of the release operation, the fastening nut d is loosened, and the fork e and the release lever f supporting the rotation of the support shaft c are advanced and retracted.

However, in such a structure, the number of parts is large, and it becomes long to increase the width of the engine case. On the other hand, if it is supported like the one disclosed in Japanese Patent Laid-Open No. 61-256026, there is a problem that the release lever easily comes off and is difficult to assemble.

(Problems to be solved by the invention) Therefore, the invention provides a change clutch release device for a motorcycle, in which the number of parts is reduced and the overall length is shortened, and moreover, it is easy to assemble without dropping. The purpose is to

[Constitution of device]

(Means for Solving the Problems) With the above object, the change clutch release device for a motorcycle according to the present invention pivotally supports a release lever on the inner surface of the clutch cover, and the transmission gear mechanism is changed through the release lever. In the case where the change clutch is opened for each operation, a through hole is opened in the clutch cover, a cross-shaped groove is formed in the front, a spindle is projected behind, and a screw hole is formed in the center of the spindle. A boss for supporting the release lever that penetrates through is separately provided, and the boss is fitted into the through hole and fixed to the inner surface of the clutch cover with a screw. Insert the projected pivot into the cross groove of the boss, and bring the tip of the adjust screw screwed into the screw hole from the outer surface of the clutch cover into contact with the rear surface of the release lever. Make the configuration.

(Function) As described above, since it is only necessary to separately manufacture the boss for supporting the release lever and attach it to the clutch cover, and further to provide the cross-shaped groove on the front surface of the boss and insert the release lever,
It is easy to assemble, and the release lever is supported close to the inner surface of the clutch cover, reducing the width of the engine.

By inserting the screw that protrudes into the cross-shaped groove after inserting the release lever on the front side of the boss, you do not have to worry about it coming off during assembly.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the essential parts of the mission gear mechanism and its change mechanism. Reference numeral 1 denotes a counter shaft, which is rotatably supported in parallel with the mission drive gear 2.
The mission drive gear 2 selects a required speed range by shifting the mesh with the mission driven gear on the drive shaft. In the gear shift, the change pedal 3 is operated to oscillate the shift arm 5 on the change shaft 4 to give a rotary displacement to the rotary shift cam 6, and accordingly, the mission drive and the driven gear are laterally moved via the shift fork. Let
It is performed by controlling the connection / disconnection of the dog clutch attached to the side surface.

On the other hand, a change clutch 7 is provided at the counter shaft end. The change clutch 7 is a multi-plate friction clutch, which is constantly in pressure contact with a clutch spring 8 via a pressure plate 9 and connects a primary driven gear 10 provided on the outer periphery to the counter shaft 1. The primary driven gear 10 meshes with the primary driven gear of the crankshaft to rotate and drives the countershaft 1.

A push piece 11 that contacts the pressure plate 9 is provided at the end of the counter shaft 1. When the push piece 11 is pushed, the pressure plate 9 is pushed back against the clutch spring 8 and the change clutch 7 is opened to interrupt the torque transmission to the counter shaft 1.

One end 13a of a release lever 13 pivotally supported on the inner surface of the clutch cover 12 contacts the back surface of the push piece 11. The other end 13b of the release lever 13 contacts the back surface of the release piece 14.

The release piece 14 is slidably supported by a cam shaft 15 and is integrally connected to a driven cam plate 16. The driven cam plate 16 contacts the detent 17 and is prevented from rotating,
It faces a rotatable drive cam plate 18 on the cam shaft 15.
Axial recesses 16a and 18a face the cam plates 16 and 18, respectively, and a ball 19 is sandwiched therein.

A cam 20 is formed on the outer peripheral edge of the drive cam plate 18 so as to be recessed in the diameter direction, and a roller 22 at the tip of a release arm 21 fixed to the change shaft 4 is in contact therewith. By the change operation, the release arm 21 swings together with the shift lever 5, and the drive cam plate 18 rotates.

When the drive cam plate 18 rotates, a relative rotational displacement is generated between the drive cam plate 18 and the driven cam plate 16, and the balls 19 come out of the recesses 16a and 18a to give the driven cam plate 16 axial displacement. That is, the release piece pushes the other end 13b of the release lever,
Therefore, the one end 13a pushes the bush piece 11 to open the change clutch 7.

Next, the support structure of the release lever 13 will be described.

As also shown in FIG. 3, the boss 23 that supports the release lever 13 is manufactured separately. The boss 23 is provided with concave grooves 24, 25 intersecting in a cross shape, a support shaft 26 protruding rearward, and a screw hole 27 penetrating the center of the support shaft 26. Then, the support shaft 26 is fitted into a through hole 28 provided in the clutch cover 12, and is fixed to the inner surface of the clutch cover 12 with a screw 29.

An adjusting screw 30 is screwed into the screw hole 27, and a nut 31 is further tightened on the adjusting screw 30 to prevent loosening, and the nut 31 presses a washer 32 to seal the through hole 28 with a seal ring 33.

The release lever 13 has a relatively thin width, and has a pivot 34 projecting from both sides at the center. Insert this release lever 13 into one of the cross-shaped grooves 24 on the front of the boss,
The pivot 34 is inserted into the other groove 25. After insertion, the screw 35 is screwed onto the front surface of the boss so as to partially project into the groove 25 to prevent the screw 35 from falling off.

By attaching the clutch cover 12 in this manner, both ends 13a and 13b of the release lever 13 come into contact with the back surfaces of the bush piece 11 and the release piece 14. If the contact is insufficient, adjust screw 30 by turning adjust screw 30 and pushing release piece 14.

Since the boss 23 is manufactured as a separate part, the processability of the grooves 24, 25 and the screw hole 27 is good. Further, since the release piece 14 is directly supported by the boss 23, the release piece 14 can be mounted close to the inner surface of the clutch cover 12, and the width of the engine case can be shortened. At the same time, the release piece is guided by the cross groove.
The 14 has an accurate posture and is easy to prevent from falling off, and the assembly is improved.

[Effect of device]

As described above, the change clutch release device for a motorcycle according to the present invention penetrates the clutch cover, fixes a separate boss to the inner surface of the clutch cover, and supports the release lever by the cross groove on the front surface of the clutch cover. The release lever is directly adjusted from the outer surface of the cover by an adjusting screw, which has the effect of reducing the number of parts, shortening the overall length, reducing the width of the engine case, and improving the assemblability.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a transmission gear mechanism including a release device according to an embodiment of the present invention and a change mechanism thereof, FIG. 2 is a side view taken along the arrow AA in FIG. 1, and FIG. FIG. 1 is a cross-sectional view of the release device taken along the line BB, and FIG. 4 is a cross-sectional view showing a conventional release device. 1 ... Counter shaft, 2 ... Mission drive gear, 7 ... Change clutch, 11 ... Push piece, 12 ... Clutch cover, 13 ... Release lever, 14 ... Release piece, 23 ...
Boss, 24, 25 ... Recessed groove, 26 ... Shaft, 27 ... Screw hole, 28 ... Through hole, 29 ... Screw, 30 ... Adjust screw, 34 ... Axis.

Claims (1)

[Scope of utility model registration request] 1. A release lever is pivotally supported on the inner surface of the clutch cover, and a change clutch is opened each time the transmission gear mechanism is changed through the release lever. The cross-shaped groove is recessed on the front, and the spindle is projected on the back,
In addition, a boss for supporting the release lever, which penetrates the screw hole at the center of the support shaft, is separately prepared and provided, and the boss is fitted into the through hole and fixed to the inner surface of the clutch cover with a screw. The release lever and the pivots projecting to both side surfaces thereof are inserted into the cross groove of the boss, and the tip of the adjusting screw screwed into the screw hole from the outer surface of the clutch cover is brought into contact with the rear surface of the release lever. Change clutch release device for motorcycles.