JP2896322B2 - Clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-plate friction type clutch device for interrupting power transmission between a crankshaft and a transmission input shaft of a motorcycle.

[0002]

2. Description of the Related Art FIG. 1 is a longitudinal sectional view of a multi-plate friction clutch device for a motorcycle to which the present invention is applied. First, the overall structure of the clutch device will be described with reference to FIG. .

[0003] The clutch device C comprises a bottomed tubular clutch housing 1 and an axially movable slide holder 2.
And an inner hub 5 fixed to the speed change input shaft 3. The inner hub 5 has an inner peripheral end integrally fixed to the spline boss 4 and a plurality of annular clutch plates 7 spline-fitted to the outer cylindrical portion so as to be movable in the axial direction. A large number of annular friction plates 8 and 9 are fitted to the cylindrical portion of the clutch housing 1 so as to be movable in the axial direction. The clutch plates 7 and the friction plates 8 and 9 are alternately overlapped with each other, and they are pressed against the slide holder 2 and the front end flange of the inner hub 5 by the elastic force of the clutch spring 6.

The slide holder 2 is axially slidably fitted to the rear end fitting surface 4 a of the spline boss 4, and has a plurality of cylindrical projections 11 protruding forward through holes 10 of the inner hub 5. Are integrally provided. Protrusion 1
4 are formed at equal intervals in the circumferential direction.
A holder plate 14 is fixed to the front end face of the holder plate 14 at right angles to the transmission input shaft center by bolts 15. The clutch spring 6 is contracted between the holder plate 14 and the rim 5a of the inner hub 5, and the elastic force of the clutch spring 6 urges the slide holder 2 forward in the axial direction. Are connected. The clutch spring 6 is disposed for each of the protrusions 11 and the protrusion 1
1 is fitted on the outer periphery.

[0005] The clutch housing 1 is connected to a clutch input gear 20 via a coil spring 21 and the like.
2 and the speed change input shaft 3 via the bush 23.
Is rotatably fitted to the outer periphery of.

The fixing structure of the inner hub 5 will be described. An outer peripheral spline tooth 3 a is formed at the tip end of the speed change input shaft 3, and a coaxial female thread portion 24 is formed. The spline boss 4 of the inner hub 5 is connected to the outer circumference spline tooth 3a, it is spline-fitted, and is tightened and fixed in the axial direction by the head of a hub tightening bolt 25 screwed to the female screw portion 24. The outer peripheral rear end 5c of the inner hub 5 is spline-fitted to the slide holder 2 so as to be movable in the axial direction.

[0007]

The above-mentioned hub tightening bolt 2
In the work of tightening 5, it is difficult to sufficiently tighten the transmission input shaft 3 together with the hub tightening bolt 25, even if an attempt is made to manually tighten the gear using a normal wrench.

Such a tightening operation can be performed by, for example, an impact wrench.
Must be tightened with the specified tightening torque value,
Ultimately, a torque wrench must be used to tighten to a predetermined torque value.

That is, even when the impact wrench is used as described above, or even when the impact wrench is manually operated from the beginning, it is necessary to finally perform the work of tightening with a torque wrench. The non-rotating tool is engaged by utilizing the outer peripheral tooth surface of No. 20 and the detent is performed through the joining force of the clutch, or the non-rotating tool T1 is engaged with the holder plate 14 as shown in FIG. As a result, the inner hub 5 is prevented from rotating through the holder plate 14 and the protrusion 11 of the slide holder 2 fixed to the holder plate 14, and is tightened to a predetermined torque value using a torque wrench.

However, according to the former method, there is a disadvantage that it is not possible to apply a tightening torque higher than the joining force of the clutch. In the latter case, a torsional torque is applied to the tip of the projection 11 of the slide holder 2. Projection 11
May be deformed, and in any case, a desired tightening torque may not be applied.

In a normal assembly line, one worker must operate the torque wrench while holding the rotation preventing tool, and the tightening torque value of the hub tightening bolt is quite large. Good workability is required. As a prior art document, there is Japanese Utility Model Publication No. 60-37468.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the shape of the holder plate and the inner hub so as to prevent detent, secure a sufficient tightening torque in tightening the clutch hub, and improve the efficiency of the tightening operation. It is to improve.

[0013]

According to a first aspect of the present invention, there is provided an inner hub integrally fixed to a speed change input shaft, and an inner hub movable in an axial direction with respect to the inner hub. A slide holder and a clutch housing on the drive side are provided, and a friction plate supported by the clutch housing and a clutch plate supported by the inner hub are sandwiched between the slide holder and the inner hub, and as a means for fixing the inner hub. A clutch device in which the inner hub is axially tightened by spline fitting the inner hub to the speed change input shaft and screwing a hub tightening bolt or a hub tightening nut to the shaft center portion of the speed change input shaft tip. The slide holder has a projection that extends through the inner hub and extends to the release bearing side. At the tip of the protrusion, the opposite holder plate is fixed to the inner hub rim at an axial distance, and a hub tightening tool insertion and release bearing fitting hole is formed at the axis of the holder plate, and the inner hub is formed. Has an engaging portion capable of locking the detent tool, and a holder plate has an insertion hole at a position corresponding to the engaging portion, through which the detent tool can be inserted and engaged.

According to a second aspect of the present invention, in addition to the above-mentioned main object, in order to reduce the number of processing steps, the reinforcing rib integrally formed on the rim of the inner hub is used as a detent tool engaging portion.

[0015]

In the hub tightening operation, a socket wrench is inserted together with the hub tightening bolt (nut) from the release bearing fitting hole in the shaft center portion of the holder plate, and the bub tightening bolt is tightened.

After removing the socket wrench, the claw of the detent tool is inserted into the detent tool insertion hole of the holder plate, and its tip is engaged with the engagement part of the inner hub. As a result, the claw portion of the detent tool abuts and is supported at two points, that is, the point of engagement with the inner hub and the point of engagement with the holder plate axially away from the point of engagement. Lock the speed change input shaft through the plate.

In this state, a torque wrench is inserted through the release bearing fitting hole of the holder plate, and tightened to a predetermined torque value while holding the handle of the detent tool.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overall structure of the clutch device has been described in the section of the prior art, so that the description thereof will be omitted, and the features of the holder plate and the inner hub which are the main parts of the present application will be described.

In FIG. 1, the rim 5a of the inner hub 5
A reinforcing rib 2 extending from the axial end to the outer peripheral end.
The reinforcing ribs 26 are formed at four locations between the adjacent protrusions 11 in the circumferential direction and at equal intervals in the circumferential direction as shown in FIG. That is,
Each rib 26 extends radially and is generally arranged in a cross shape.

The holder plate 14 includes the inner hub 5
Is formed in a disk shape at a constant radial distance d from the inner peripheral surface of the cylindrical portion. A release bearing fitting hole 27 into which the hub tightening bolt 25 can be inserted is formed in the shaft center portion of the holder plate 14, and a bolt insertion hole 28 is formed in four places corresponding to the protrusions 11 in FIG. I have.
Then, as shown in FIG. 2, at a position corresponding to each rib 26,
A circular detent tool insertion hole 30 is formed.

FIG. 6 shows an example of the non-rotating tool T. The recess 32 is large enough to accommodate the head of the torque wrench R.
The forked portion 33 has a substantially columnar claw portion 31 formed at each end of the forked portion 33.
Each claw portion 31 is provided so as to correspond to the two tool insertion holes 30 aligned on the same diameter line as shown in FIG. 2, and has a slight play in the detent tool insertion hole 30 as shown in FIG. 3. It has an insertable diameter. Further, an engagement groove 35 having a groove width large enough to engage with the rib 26 of the inner hub 5 is formed.

The fastening operation will be described. In the hub tightening operation, before fitting the release bearing 40 of FIG. 1 to the holder plate 14, a socket wrench is inserted together with the hub tightening bolt 25 from the release bearing fitting hole 27 and the hub tightening bolt 25 is tightened. .

After removing the socket wrench, the claw portion 31 of the detent tool T is inserted into the detent tool insertion hole 30 of the holder plate 14 as shown in FIG.
Is engaged with the rib 26 of the inner hub 5. As a result, the pawl portion 31 of the detent tool T comes into contact with and is supported at two points: an engagement point with the inner hub 5 and an engagement point with the holder plate 14 axially away from the engagement point.
The speed change input shaft 3 is prevented from rotating through the inner hub 5 and the holder plate 14.

In this state, the torque wrench R is engaged with the head of the hub tightening bolt 25 through the release bearing fitting hole 27 of the holder plate 14 and tightened to a predetermined torque value.

[0025]

[Another embodiment]

(1) FIG. 7 shows a modification of the engaging portion, in which an engaging recess 42 is formed in the rim 5a of the inner hub 5, and the engaging recess 4 is formed.
2 is a structure in which the tip of the claw portion 31 of the detent tool T is fitted.

(2) FIG. 8 shows another modification of the engaging portion, in which a female screw hole 43 is formed in the rim 5a of the inner hub 5, and the anti-rotation tool T is formed in the female screw hole 43 for engagement. Claw part 3
This is a structure in which one male screw portion 31a is screwed.

(3) The structure of the engaging portion provided on the rim 5a of the inner hub 5 may be a structure in which a projection is formed and a recess formed in the tip of the claw portion of the rotation preventing tool is fitted into the projection.

(4) The number of engaging portions provided on the rim 5a of the inner hub 5 and the number of rotation preventing tool insertion holes formed in the holder plate 14 are not limited to four as shown in FIG.
It is possible to prevent rotation at one place. Of course, a plurality of locations other than the four locations are possible.

(5) As shown in FIG. 1, instead of the combination of the female screw portion 24 and the hub tightening bolt 25, the speed change input shaft 3
The present invention can also be applied to a clutch device having a structure in which a thread portion is projected from the tip of the inner thread portion and a hub tightening nut is screwed onto the male thread portion to fasten the inner hub 5.

[0030]

As described above, according to the first and second aspects of the present invention,
According to the described invention, (1) the rim 5a of the inner hub 5 is formed with an engaging portion with which the claw portion 31 of the rotation preventing tool T is engaged, and a portion of the holder plate 14 corresponding to the engaging portion is provided with: By forming a tool insertion hole 30 through which the claw 31 of the detent tool T can be inserted and engaged, and supporting the claw 31 of the detent tool at two points separated in the axial direction, the inner hub 5 And the shift input shaft 3 is prevented from rotating with a sufficient resistance in a very stable state via the and the holder plate 14.
At the time of the hub tightening operation, particularly at the time of the final tightening operation using the torque wrench, the rotation can be reliably prevented, and the hub tightening operation efficiency is improved, and the desired tightening torque can be secured.

(2) As described in the second aspect of the present invention, the use of the reinforcing rib 26 as the engaging portion formed on the inner hub 5 can suppress an increase in the number of processing steps.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a clutch device to which the invention according to claims 1 and 2 of the present application is applied.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a vertical cross-sectional view (a cross-sectional view taken along line III-III of FIG. 4) of the clutch device showing a state in which a rotation preventing tool is inserted.

FIG. 4 is a view taken in the direction of arrow IV in FIG. 3;

FIG. 5 is an enlarged cross-sectional view taken along line VV of FIG.

FIG. 6 is a rear view of the detent tool.

FIG. 7 is a cross-sectional view of the same portion as FIG. 5, showing a modification of the engaging portion.

FIG. 8 shows another modification of the engaging portion, and is a cross-sectional view of the same portion as FIG.

FIG. 9 is a front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clutch housing 2 Slide holder 3 Speed change input shaft 5 Inner hub 25 Hub tightening bolt 26 Reinforcement rib (an example of an engagement part) 27 Release bearing fitting hole 30 Detent tool insertion hole 42 Engagement concave part (an example of an engagement part) 43) Female thread concave part (an example of an engaging part)

Claims (2)

(57) [Claims] 1. A friction plate supported by a clutch housing, comprising: an inner hub integrally fixed to a shift input shaft; a slide holder axially movable with respect to the inner hub; and a drive-side clutch housing. And the clutch plate supported by the inner hub are sandwiched between the slide holder and the inner hub. As a means for fixing the inner hub, the inner hub is spline-fitted to the speed change input shaft, and a hub tightening bolt or hub tightening is performed. In a clutch device in which the inner hub is fastened in the axial direction by screwing a nut with a screw to the tip shaft portion of the transmission input shaft, a protrusion extending through the inner hub to the release bearing side is formed on the slide holder. A holder that faces the tip of the projection at an axial distance from the rim of the inner hub The holder plate is fixed, and a hub tightening tool insertion / release bearing fitting hole is formed in the axis of the holder plate.The inner hub is formed with an engaging portion that can lock the rotation prevention tool. A clutch device, characterized in that an insertion hole through which a detent tool can be inserted and engaged is formed at a position corresponding to the engagement portion. 2. The clutch device according to claim 1, wherein
Reinforcing ribs integrally molded on the rim of the inner hub,
A clutch device comprising a detent tool engaging portion.