JPS6133300Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multi-disc friction clutch used in motorcycles and the like.

The multi-plate friction clutch has a clutch outer 01 that is rotated by the meshing of a clutch gear disposed on the clutch outer 01 and a gear on the crank side.
In a plurality of grooves 02 formed in the direction of the rotation axis,
A plurality of clutch disks 03 are arranged in a state in which a plurality of claws 04 formed along the outer circumferential direction of the clutch disk 03 are engaged, and a plurality of claws 04 formed in the direction of the rotation axis of the clutch center 05 are arranged. A plurality of clutch plates 08 disposed in engagement with the grooves 06 and each of the clutch disks 03 are arranged alternately, and the plurality of clutch plates 08 are arranged alternately between the pressure plate 09 and the pressure receiving portion 07 of the clutch center 05. The clutch disk 03 and the clutch plate 08 are frictionally engaged under strong pressure so that the rotation of the clutch outer 01 is transmitted to the clutch center 05 (see FIG. 1).

However, since there is a gap t between the claw portion 04 of the clutch disk 03 and the clutch outer 01 due to machining tolerances (see Fig. 2), when torque fluctuation occurs on the input side, the clutch outer 01
In contrast, the clutch center 05 is relatively displaced, and the clutch outer 01 and the pawl portion 04 come into contact, producing a hitting sound. This hitting sound is mainly perceived as noise during idling.

The present invention addresses the above-mentioned problems, and its purpose is to provide a clutch that prevents the occurrence of impact noise during torque fluctuations.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings.

The multi-plate friction clutch 1 includes a clutch gear 3, an outer driver 4, a clutch outer 2 having a plurality of grooves 4a formed in the direction of the rotation axis of the outer driver 4, and a claw portion 6 that engages with the grooves 4a. a plurality of clutch disks 5 having
A clutch center 7 having a pressure receiving part 8 and a plurality of grooves 7a formed in the direction of the rotation axis on the outer circumferential surface, and a plurality of clutches having a plurality of claws formed over the inner circumference to engage with the grooves 7a. plate 9
a pressure plate 10 having a boss portion 11 that is fitted into a plurality of openings formed in the wall of the clutch center 7 and is also screwed onto a lifter plate 12 described later; and a lifter plate 12.
and a clutch spring 13 inserted between both plates 10 and 12, the clutch outer 2 is connected to the main shaft shaft end of the transmission through a bearing, and the clutch center 7 is connected to the main shaft shaft end of the transmission through a spline connection. (See Figure 3).

A predetermined opening 5a is formed at an arbitrary location on the clutch disk 5 (see FIG. 4), and the clutch disk 5 is arranged alternately with the clutch plate 9, and the outer driver 4 and The clutch center 7 is engaged with the clutch center 7, and in this case, the opening 5a of each clutch disk 5 is
are arranged at approximately equal intervals from each other in the circumferential direction (see FIG. 5).

Next, the operation of the clutch 1 will be briefly explained.

The clutch 1 is attached to the main shaft of a transmission, and when the engine is running, the rotation of the clutch gear 3 that meshes with the gear on the crank side rotates the outer driver 4 that is integrated with the gear 3, causing the clutch spring 13 to rotate. The rotation is then strongly pressed by the biased pressure plate 10 and the pressure receiving portion 8 of the clutch center 7, and the rotation is transmitted to the clutch center 7 via the clutch disk 5 and the clutch plate 9, which are frictionally engaged.
The main shaft connected to the clutch center 7 by splines rotates.

Next, when disconnecting the clutch 1, by operating a lifter member (not shown),
The lifter plate 12 and the pressure plate 10 are displaced to the left in FIG. 3 against the clutch spring 13. Therefore,
Clutch disk 5 and clutch plate 9
is disengaged, and rotation from the clutch outer 2 is no longer transmitted to the clutch center 7.

The clutch 1 is operated as described above, but the reason why this embodiment does not generate a clicking sound unlike the conventionally known clutch, even if there is a torque fluctuation on the input side, will be explained below.

When the clutch 1 is disengaged when the engine is running, each clutch disk 5 is released from frictional engagement with the clutch plate 9 and placed in a free state, as described above.

However, since each clutch disk 5 has an opening 5a formed at one location, and the weight balance is disrupted, the clutch disk 5 and outer driver 4 are shown in FIG. The clutch disk 5 is shown in Fig.
Due to centrifugal force, the outer driver 4 is moved toward the outer driver 4 in the direction opposite to the opening 5a (in the direction of the arrow in FIG. 6), and the claws 6a, 6b and the outer driver 4
There is no gap between A and 4B. Moreover, since the openings 5a of each clutch disk 5 are arranged in different directions, each clutch disk 5 is moved in different directions.

This relationship is shown in FIG.

That is, in FIG. 7, the outer driver 4
The relationship between the clutch disk 5 and the pawl portion 6 of each clutch disk 5 is shown in an enlarged view from different directions, . . . by 90 degrees.

As described above, when the clutch 1 is disengaged and the clutch disks 5 are moved in different directions, when the clutch 1 is connected, "claw play" occurs between each clutch disk 5 and the outer driver 4.
As a result, the above-mentioned hitting noise caused by input torque fluctuations is significantly reduced.

In the above embodiment, the openings 5a of each clutch disk 5 are disposed so as to be mutually displaced in the circumferential direction in order to maintain the weight balance of the entire clutch. This is to avoid stress concentration on the clutch disc 5.

Further, in the above embodiment, two circular openings 5a are formed at one location on the circumference of the clutch disk 5, but the number does not necessarily have to be two, and the shape can be arbitrarily selected within a range that does not cause any problems. obtain. Alternatively, instead of an opening, an arbitrarily shaped thin section (for example,
grooves, etc.).

As is clear from the description of the embodiment, the present invention relates to a multi-plate friction clutch in which a number of friction disks are stacked and each disk is supported with a loose fit in an axial split groove of the clutch outer and an axial groove of the clutch center, and in which light portions formed by holes or grooves etc. are provided at predetermined locations of the disks supported with a loose fit on the clutch outer side, and the light portions of each disk are displaced in the circumferential direction. With this configuration, the claw portion of the clutch disk is brought into close contact with the clutch outer, making it possible to greatly reduce the slapping noise generated by the "backlash" between the clutch outer and the clutch disk claw portion when the torque on the clutch input side fluctuates.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the main parts of a conventionally known multi-plate friction clutch, Fig. 2 is a schematic explanatory diagram showing the relationship between the clutch outer and the clutch disk, and Fig. 3 is used as an embodiment of the present invention. FIG. 4 is an explanatory diagram of a clutch disc according to an embodiment of the present invention; FIG. 5 is an explanatory diagram showing the arrangement relationship between the clutch disc and the clutch plate;
This figure is a schematic explanatory diagram in the same operating state, and FIG. 7 is an explanatory diagram showing the displacement of each clutch disc pawl portion. DESCRIPTION OF SYMBOLS 1... Multi-plate friction clutch, 2... Clutch outer, 3... Clutch gear, 4... Outer driver, 4a... Division groove, 5... Clutch disk, 5a'... Opening, 6... Claw portion, 7 ...Clutch center, 7a...Groove, 8...Pressure receiving portion, 9...Clutch plate, 10...Pressure plate, 11...Boss portion, 12...Lifter plate, 13...Clutch spring.

Claims (1)

[Scope of utility model registration request] In a multi-disc friction clutch in which a plurality of friction discs are overlapped and each disc is loosely fitted and supported alternately in the axial groove of the clutch outer and the axial groove of the clutch center, the discs are loosely fitted and supported on the clutch outer side. A clutch hammering sound characterized in that a lightweight part formed by a hollow hole or a groove is provided at a predetermined location of each disc, and the same lightweight part of each disc is disposed so as to be displaced in the circumferential direction. Relaxation device.