JPS63246514A - Clutch - Google Patents

Abstract

PURPOSE:To reduce the number of parts by enabling the inner peripheral end part of a diaphragm spring to be moved in the axial direction by means of a release spring and making the diaphragm spring serve as a load generating part and a lever part. CONSTITUTION:An adjust ring 11 is screwed into the screw part 10 of a pressure plate 7 and a diaphragm spring 15 is brought into contact with its fulcrum land part 9. And, the gap between the diaphragm spring 15 and a release bearing 16 and a pressing load, etc., are adjusted by rotatingly adjusting the adjust ring 11 with respect to the pressure plate 7. Hence, the diaphragm spring 15 serves as both load generating part and lever part, reducing the number of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a clutch having a function of adjusting the height of a lever for release operation, the pressing force, and the load.

(Prior Art and its Problems) As shown in FIG. 11, this type of conventional clutch is separately provided with a lever 40 for release operation and a diaphragm spring 15 for a load generation system, which are connected to a retainer 4.
It is linked via 3.

In order to adjust the height of the lever, the adjusting ring 11 is screwed onto the threaded portion 45 of the clutch cover 6 so that its position in the axial direction can be freely adjusted, and the outer peripheral end of the lever 40 is engaged with the adjusting ring 11.

That is, by rotating the adjusting ring 11 and moving it in the axial direction, the lever height, that is, the axial position of the outer peripheral end of the lever 40 and the fulcrum land portion 41 and the lever 40 can be adjusted.
It is designed to adjust the gap between the

However, the above conventional example has the following disadvantages.

(1) Diaphragm spring 15 as a load generation system
This requires a lever 40 of the release lever system, and a retainer 43 for connecting the two parts 15 and 40, resulting in a large number of parts.

(2) In order to screw the adjusting ring 11 onto the clutch cover 6, the clutch cover 6 is provided with a female threaded portion 45. Therefore, the clutch cover 6 is made of cast metal, which is heavier than sheet metal and requires more time and effort to manufacture.

(3) Since the adjusting ring 11 is screwed onto the clutch cover 6, it is necessary to form a protrusion 46 for engaging the lever, and it is also necessary to form the four locking parts 23 in an axially extending shape. For that purpose, adjust ring 1
The axial arrangement space of 1 becomes large, which prevents the clutch from becoming more compact.

(4) Diaphragm spring 15 as a load generation system
Since the lever 40 of the lever system and the retainer 43 that connects the two are separate parts, the number of sliding parts (M, etc.) between the respective members increases.

Therefore, since the sliding resistance increases, the load characteristics of pressing are the first.
The graph will look like the solid line in Figure 2.

In FIG. 12, S indicates a set line. Further, normally, the load for pressing the clutch is set on the safe side against slippage, and when designing the clutch torque Tc, the lower limit value A1 portion of the load characteristic diagram is adopted as the load for pressing.

Therefore, in the solid line graph with large sliding resistance, the load AI for clutch pressing is lower than the calculated pressing load Bl (virtual line) by the amount of sliding resistance R. Therefore, it is necessary to design the calculated pressing to have a high load B1, and the release load will also be high.

Incidentally, the broken line C shows the case where the sliding resistance is reduced.

(Technical means for solving the problem) In order to solve the above problem, the present invention forms a threaded part concentric with the center of the clutch shaft on the pressure plate, and attaches an adjustment ring to the threaded part so that the position in the axial direction can be freely adjusted. Screw together,
A locking mechanism is provided between the adjusting ring and the clutch cover to lock and release the adjusting ring in the circumferential direction with respect to the clutch cover, and a fulcrum land portion is formed on the adjusting ring to protrude on the side opposite to the pressure plate side. The outer peripheral part of the approximately disk-shaped diaphragm spring is pressed against the above-mentioned fulcrum land, the elastic force of the diaphragm spring urges the pressure plate toward the clutch disc, and the inner peripheral end of the diaphragm spring is connected to the shaft by a Lees bearing. In FIG. 1 showing a vertical cross-sectional partial view of a pull-type clutch to which the present invention is applied, a clutch cover 6 is fixed to the rear end surface of the flywheel 1 on the input side. The peripheral wall 6 extends rearward and is integrally provided with an inward annular bent portion 6b at its rear end. clutch cover 6
Inside, a clutch disc 5, a pressure plate 7, a sheet metal adjustment ring 11, and a substantially disc-shaped (cone-shaped) diaphragm spring 15 are arranged in order from the front side (flywheel side).

The clutch disc 5 has facings 8 on both sides of its outer circumference.
It is spline-fitted to the output side clutch shaft (center line 0) so as to be movable in the axial direction.

The front end surface of the pressure plate 7 opposes the facing 8, and as shown in FIG. It is movable in the axial direction against the elastic force of.

As shown in FIG. 1, a female threaded portion 10 centered on the clutch axis O is formed on the inner circumferential surface of the pressure plate 7, and a male threaded portion 12 is formed on the adjusting ring 11. It is screwed into the female threaded part 10 of. An inward flange portion 11a is integrally formed on the inner periphery of the front end of the adjusting ring 11, and a cone spring 25 is compressed between the flange portion 11a and the rear surface of the pressure plate 7. An annular fulcrum land portion 9 projecting rearward is integrally formed on the rear end surface of the adjustment ring 11, and a plurality of four locking portions 23 are formed at intervals in the circumferential direction at the outer peripheral end.

On the other hand, a convex wall 6a that protrudes outward is formed in the middle of the peripheral wall of the clutch cover 6, and a lock plate 22 that protrudes inward is detachably fixed to the convex wall 6a by bolts 24. . The convex wall 6a forms an inspection window hole 13. The lock plate 22 is the clutch cover 6
through the hole 20 into the clutch cover 6 and engages the appropriate four portions 23 of the adjusting ring 11, thereby locking the adjusting ring 11 with respect to the clutch cover 6 in the circumferential direction. The adjusting ring 11 is movable in the axial direction relative to the lock plate 22.

The outer fulcrum C1 of the diaphragm spring 15 engages with the clutch cover bent portion 6b, the intermediate fulcrum C2 closer to the outer periphery abuts against the fulcrum land portion 9 of the adjusting ring 11, and the inner fulcrum C3 engages with the release bearing 16.
The front annular protrusion 19 is engaged from behind. The release bearing 16 is fitted to the clutch shaft so as to be movable in the axial direction, and its inner race is connected to the protrusion 19 via the sleeve 18, and its outer race is connected to the release yoke 1.
7 at a distance, and is operated to move in the axial direction by a release yoke 17. The release yoke 17 is connected to, for example, a clutch pedal.

In FIG. 1 and FIG. 3 showing the arrow view of the adjusting ring 11, the recesses 23 are arranged at equal intervals in the circumferential direction.
On the other hand, three lock plates 22 are arranged at equal intervals in the circumferential direction. Also, the bolt hole 3 of the convex wall 6a for inserting the bolt 24 for fixing the lock plate.
9 is formed into a long hole that is long in the radial direction, and the bolt 24
By loosening the lock plate 22 and moving the lock plate 22 radially outward, the lock with the four parts 23 can be released.

In FIG. 4, which shows a view in the direction of the arrow ■ in FIG. The edges prevent movement in the circumferential direction. Furthermore, guide pieces 23a that bend forward are formed on both circumferential edges of the recess 23 of the adjusting ring 11, and the guide pieces 23a engage with the guide pieces 22a of the lock plate 22.

Next, the operation will be explained.

When the clutch is connected, the spring force of the diaphragm spring 15 in FIG.
1, the adjusting ring 11 and the pressure plate 7 are pushed forward together, thereby pressing the facing 8 between the pressure plate 7 and the flywheel 1.

When disengaging the clutch, the inner peripheral end of the diaphragm spring 15 is moved rearward by pulling the release bearing 16 rearward, and thereby the intermediate fulcrum C2 moves rearward using the outer peripheral fulcrum C1 as a rotational fulcrum. Therefore, the pressure plate 7 and the adjustment ring 11 are moved rearward by the spring force of the strap plate 14, and the pressure contact with the clutch disc 5 is released.

When the clutch is connected, the male thread 12 of the adjusting ring 11 receives a forward load against the female thread 10 of the pressure plate 7 due to the spring force of the diaphragm spring 15, while when the clutch is released, the cone spring 25 Due to the spring force, a rearward load is applied to the female thread 10 portion of the pressure plate 7. That is, when the clutch is connected, as shown exaggeratedly in FIG. 5, the front surface of the crest of the threaded portion 12 is in pressure contact with the rear surface of the groove of the female threaded portion 10, and if this state continues all the time, the pressure contact surfaces of the threaded portions will There is a possibility that a sticking phenomenon may occur between the two, but when the release is done, the cone spring 25
Since a load is applied to the rear, the press-contact state shown in FIG. 5 is released, and it is possible to prevent sticking and the resulting seizure phenomenon.

When adjusting the lever height and pressing force due to wear of the facing 8, etc., that is, the gap between the facing 8 and the pressure plate 7, or the gap between the protrusion 19 of the release bearing 16 and the inner peripheral end of the diaphragm spring 15, , loosen the lock plate bolt 24 shown in FIG. 1, move the lock plate 22 outward and remove it from the recess 23,
Then, the adjustment ring 11 is rotated, for example, moved forward, and the above-mentioned gaps are adjusted.

After adjustment, engage the lock plate 22 with the four parts 23 again,
Fix it.

(Another Embodiment) (1) FIG. 6 shows another example of a pull type clutch, in which the lock plate 22 and the recess 23 are used as they are in the form of a thick plate. That is, the bent portion 22a as shown in FIG.
, 23a. The adjusting ring 11 is made of sheet metal.

(2) Fig. 7 shows an example applied to a so-called bush type clutch, in which the fulcrum C1 on the outer circumferential side of the diaphragm spring 15 abuts against the 7-aluminum land portion 9 of the adjusting ring 11, and the intermediate fulcrum C2 on the outer circumferential side is on the left and right sides. It is supported by a pair of wiring rings 30. wiring 30
Although not shown, is supported by a stud pin or bent tab fixed to the clutch cover 6.

The inner fulcrum C3 faces the release bearing 16 from the front side with a gap in between, and the release bearing 1
By pushing the inner peripheral end fulcrum C3 of the diaphragm spring 15 forward at 6, the outer peripheral fulcrum C1 is moved rearward using the intermediate fulcrum C2 as a rotational fulcrum.

The adjusting ring 11 is made of sheet metal.

The rest of the structure is substantially the same as the structure shown in FIG. 1, and the same parts are given the same numbers.

(3) FIG. 8 shows an example in which the clutch is applied to a bush type clutch, similar to FIG. 7, but the lock plate 22 and recess 23 are used as they are in the form of a thick plate. The adjusting ring 11 is made of sheet metal.

(4) FIG. 9 shows a modification of the adjusting ring 11 and the lock plate 22, in which the adjusting ring 11 has more recesses 23 than those in FIG. A radial groove 22b is formed on the side.

(5) Figure 10 is another example of a pull type clutch,
Cast metal is used as the adjustment ring 11, and two cone springs 25 are arranged in series.

(Effects of the Invention) As explained above, according to the present invention: (1) The adjustment ring 11 is connected to the pressure plate 7.
The diaphragm spring 15 is brought into contact with the fulcrum land portion 9 of the adjusting ring 11, and the adjusting ring 11 is rotated relative to the pressure plate 7 to adjust the lever height, that is, the diaphragm spring. The gap and pressure between 15 and release bearing 16 are adjusted to accommodate the load, etc.
The diaphragm spring 15 can serve as both a load generating system component and a lever component.

Therefore, compared to the conventional structure shown in FIG. 11, the number of parts such as the lever 40 and the retainer 43 can be reduced, the number of parts and cost can be reduced, and the clutch can be made more compact.

(2) Adjust the adjustment ring 11 to the pressure plate 7
Since the clutch cover 6 is screwed into the clutch cover 6, there is no need to form a female threaded part on the clutch cover 6.
can be easily made from sheet metal, making manufacturing easier and reducing weight.

(3) Connect the adjustment ring 11 to the pressure plate 7
Since the adjustment ring is screwed into the clutch cover, compared to the conventional case where the adjustment ring is screwed into the clutch cover, the axial arrangement space for the adjustment ring is smaller, and further compactness can be achieved.

(4) Since the diaphragm spring 15 serves as both a load generation system component and a lever base component, it is the first
Compared to the case where a retainer is provided as shown in Figure 1, the number of sliding parts between each member is significantly reduced, the sliding resistance due to friction of the sliding parts is reduced, the hysteresis is reduced, and the clutch release load is reduced. Can be set.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional partial view of a pull-type clutch to which the present invention is applied, Fig. 2 is a longitudinal cross-sectional partial view of another part of the same clutch as Fig. 1, and Fig. 3 is a vertical cross-sectional partial view of another part of the clutch shown in Fig. 1. Fig. 4 is a view from the ■ arrow in Fig. 1, Fig. 5 is a view from 7 in Fig. 1.
6, 7 and 8 are longitudinal sectional views of another embodiment, FIG. 9 is a front view showing a modification of the adjusting ring, and FIG. 10 is a further embodiment. FIG. 11 is a vertical cross-sectional view of a conventional example, and FIG. 12 is a load characteristic diagram. 5...Clutch disc, 6...Clutch cover, 7...Pressure plate, 9...
・Falcrum land part, 10... Threaded part, 11...
・Adjustment ring, 15...Diaphragm spring, 16...Release bearing, 22.23...
Lock plate, four parts (lock mechanism) Patent applicant: Daikin Seisakusho Co., Ltd. Figure 9, Figure to

Claims (1)

[Claims] A threaded part concentric with the center of the clutch shaft is formed on the pressure plate, and an adjusting ring is screwed into the threaded part so that its position in the axial direction can be freely adjusted. A locking mechanism that locks and releases in the circumferential direction is provided, a fulcrum land portion is formed on the adjusting ring that protrudes on the side opposite to the pressure plate side, and the outer peripheral side portion of the approximately disc-shaped diaphragm spring is pressed against the fulcrum land portion. A clutch characterized in that the pressure plate is biased toward the clutch disk by the elastic force of the diaphragm spring, and the inner peripheral end of the diaphragm spring is movable in the axial direction by a release bearing.