JPH0531291Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a clutch cover equipped with a diaphragm spring for applying pressing load to the pressure plate and a cone spring for cutting off the peak portion of the pressing load. Regarding assembly.

(Prior art) As shown by PS in Fig. 6, the pressing load characteristic of this type of clutch cover assembly is determined by cutting the peak portion of the load characteristic (broken line) caused only by the diaphragm spring using a cone spring for peak cutting. The increase in the pressing load PS during wear-in is suppressed and approximately averaged as shown by the solid line. That is, the cone spring prevents an increase in the required pressing force of the clutch pedal during wear-in, and improves the operability of the clutch during wear-in.

However, conventionally, as shown in FIG. 5, the peak cut cone spring 30 is disposed between the diaphragm spring 7 and the end wall of the clutch cover 2 (on the opposite side from the pressure plate 8), and the outer peripheral end of the cone spring 30 is is engaged with the inner peripheral end of the clutch cover 2, and the inner peripheral end of the cone spring 30 is brought into contact with the inner peripheral part of the diaphragm spring 7.

In such a structure of the cone spring 30, the tab 3
In the process before caulking the cone spring 30
, then the wiring 6 and diaphragm spring 7 must be inserted, and the tab 3 must be swaged. That is, it takes time to assemble and it is difficult to replace the cone spring 30 and the like.

Moreover, since the inner circumferential end of the cone spring 30 is in contact with the inner circumferential side of the diaphragm spring 7, when the inner circumferential end of the diaphragm spring 7 is pushed forward and released, the inner circumferential end of the diaphragm spring 7 As a result, a gap is created between the inner peripheral end of the cone spring 30 and the diaphragm spring 7. As a result, the 6th
As shown in the figure, the cone spring action start position X2 in the release load characteristic PL and the pressing load characteristic
A relatively large deviation d1 occurs between PS and the cone spring action start position X1, and an increase in release load PL cannot be prevented at the initial stage of wear-in. That is, there is a disadvantage that the effect of reducing the required pressing force of the clutch pedal is reduced.

(Purpose of the invention) The purpose of the invention is to improve the ease of assembling the cone spring for peak cut, and to make it possible to perform peak cut of the release load almost from the initial stage of wear-in, thereby improving release operability. be.

(Technical means for achieving the object) In order to achieve the above object, the present invention provides an outward protrusion for preventing rotation on the outer peripheral end of the cone spring, and a notch on the inner peripheral end through which the tab can pass. The cone spring is arranged on the pressure plate side of the diaphragm spring, the part of the inner circumferential end of the cone spring where the notch is not located is engaged and supported by the tab, and the outer circumferential end of the cone spring is arranged on the pressure plate side of the diaphragm spring. The outer periphery of the fulcrum is in contact with the outer periphery of the fulcrum, and the outward protrusion is engaged with the slit.

(Example) Fig. 1 is a vertical cross-sectional partial view of a clutch cover assembly to which the present invention is applied. The outer peripheral end of the cover 2 is fixed to the rear end surface of the flywheel 1 on the engine side, extends rearward, and the rear end is bent radially inward, and the inner peripheral end includes:
A plurality of tabs 3 having an L-shaped cross section are formed on the same circumference at equal intervals. A pair of wire rings 6 supported by the tabs 3 sandwich the intermediate fulcrum C2 of the diaphragm spring 7, and a release bearing ( (not shown) are arranged.

Between the diaphragm spring 7 and the flywheel 1, a pressure plate 8 and a clutch disk facing 1 are installed in order from the diaphragm spring 7 side.
2 are arranged, and the pressure plate 8 has a strap plate (not shown) at its outer peripheral end.
The clutch disc is connected to the clutch cover 2 so as to be movable in the axial direction, and the clutch disc is connected to the output shaft (center line O).

An annular fulcrum boss 13 that protrudes rearward is integrally formed at the outer end of the rear surface of the pressure plate 8, and the fulcrum boss 13 abuts on the outer peripheral fulcrum C1 of the diaphragm spring 7, and also extends in the circumferential direction. A plurality of radial slits 16 are formed at equal intervals.

The peak cutting cone spring 17 is disposed on the radially outer side of the tab 3 between the diaphragm spring 7 and the pressure plate 8, and its inner peripheral end is engaged and supported by the stepped portion 22 of the tab 3. The outer peripheral end portion is in contact with a substantially outer peripheral fulcrum portion C1 of the diaphragm spring 7.

In FIG. 2 showing a cross-sectional perspective view, a notch 21 large enough to allow the tab 3 to pass through in the axial direction is formed at the inner peripheral end of the cone spring 17, and the notch 21 is the same as the tab 3. They are arranged at equal intervals in the circumferential direction. When the assembly is completed, each of the notches 21 is located between the tabs 3, and the notches 21
The inner peripheral end portion where is not located engages with the stepped portion 22 of the tab 3.

At the outer peripheral end of the cone spring 17, outward protrusions 18 for preventing rotation are formed in a number and arrangement corresponding to the slits 16 of the fulcrum boss 13. They are engaged and held from behind by the diaphragm spring 7.

To explain the assembly order of such a clutch cover assembly, first, the pressure plate 8
In an unassembled state and a state in which the tip of the tab 3 is not caulked, a wiring 6 and a diaphragm spring 7 are assembled into the tab 3 portion of the clutch cover 2 from the front, and the tip of the tab 3 is caulked.

In this sub-assembly state, the cone spring 17 is fitted into the tab 3 from the front side. In FIG.
1 into the tabs 3 corresponding to each tab 3 (imaginary line), and then rotate the cone spring 17 by a certain amount in the direction of the arrow, for example, to insert the inner peripheral end portion between the notches 21 into the tab 3 (solid line). ) is engaged with the stepped portion 22. As a result, the inner circumferential end of the cone spring 17 does not fall off in the axial direction.

Next, the pressure plate 8 is connected to the clutch cover 2 by a strap plate, and at this time, as shown in FIG. 3, the slit 16 of the fulcrum boss 13 is engaged with each outward projection 18 to prevent rotation.

When the assembly is completed, the load on the cone spring 17 is set to zero.

When the clutch is released, the inner fulcrum C3 of the diaphragm spring 7 is pushed forward by the release bearing, thereby the outer fulcrum C1 of the diaphragm spring 7 moves rearward, and the pressure plate 8 is separated from the facing 12. .

During the initial release operation before wear-in occurs, the cone spring 17 hardly acts as shown by the deflection S1 in FIG.

When wear-in occurs due to wear of the facing 12 due to use, the axial position of the pressure plate 8 moves toward the flywheel when the clutch is connected, and therefore the outer periphery fulcrum C of the cone spring 17 shifts.
The position No. 1 also moves forward, and the inner circumferential end of the diaphragm spring 7 moves backward because it is supported by the wiring 6, so that the amount of deflection of the diaphragm spring 7 decreases.

On the other hand, since the inner peripheral end of the cone spring 17 is engaged with the step part 22 of the tab 3, the cone spring 17 uses the inner peripheral end as a fulcrum by moving the outer peripheral fulcrum C1 of the diaphragm spring 7 forward. Compressed axially. Therefore, the outer peripheral fulcrum C1 of the diaphragm spring 7 is urged backward by the cone spring 17,
The increase in the pressing load PS is suppressed as shown by the solid line in FIG.

Moreover, since the outer peripheral end of the cone spring 17 is in contact with the outer peripheral fulcrum C1 of the diaphragm spring 7 or its vicinity, the diaphragm spring 7 is more easily biased than the conventional case where the inner peripheral part of the diaphragm spring 7 is biased as shown in FIG. There is no large relief due to the deflection of the inner peripheral side of the spring 7, so the release load characteristics are as shown in Figure 4.
The action start point X2 of the cone spring in PL hardly deviates from the action start point X1 in the pressing load characteristic PS. That is, the deviation amount d1 becomes extremely small, effectively preventing an increase in the required depression force of the clutch pedal from the initial stage of wear-in.

In addition, in Fig. 4, each load characteristic indicated by a solid line
PL and PS respectively indicate the characteristics when the cone spring of the present invention is provided, and the broken line indicates the characteristics when the cone spring is not provided.

(Effects of the invention) As explained above, according to the invention, the provision of the peak cut cone spring 17 prevents an increase in the pressing load PS and release load PL during wear-in, and reduces the required pressing force of the clutch pedal. In addition to this, it has the following advantages:

(1) Since the inner peripheral end of the cone spring 17 is supported by the tab 3, and the outer peripheral end of the cone spring 17 is in contact with the vicinity of the outer peripheral fulcrum of the diaphragm spring 7,
Compared to the conventional case where the inner circumferential side of the diaphragm spring 7 is biased as shown in FIG.
Delay d1 at the start of cone spring action in PL
becomes extremely small.

Therefore, the increase in release load can be suppressed from the initial stage of wear-in, and the release operation force can be reduced.

(2) A notch 21 is provided at the inner peripheral end of the cone spring 17 through which the tab 3 can pass, and the cone spring 17 is inserted into the tab 3 from the pressure plate side. Since the part where the notch 21 is not located is engaged with the tab 3, after the diaphragm spring 7 is attached to the tab 3 and the tab 3 is caulked, the cone spring 17 can be easily attached.
can be attached, improving ease of assembly. Also, the cone spring can be easily replaced.

(3) An outward protrusion 18 on the outer peripheral end of the cone spring 17
Since the protrusion 18 is prevented from rotating by engaging with the slit 16 of the fulcrum boss 13 of the pressure plate 8, generation of abnormal noise due to rotation of the cone spring 17 relative to other members is prevented. can.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional partial view of a clutch cover assembly to which the present invention is applied, Fig. 2 is a cross-sectional perspective view,
Fig. 3 is a front view of a cone spring showing the assembly process of the cone spring, Fig. 4 is a load characteristic diagram of the present invention, Fig. 5 is a vertical cross-sectional partial view of a conventional example, and Fig. 6 is a conventional example. It is a load characteristic diagram of. 2...Clutch cover, 3...Tab, 6...Wiring, 7...Diaphragm spring, 8...Pressure plate,
13...Fulcrum boss, 16...Slit, 17...
Cone spring for peak cut, 18... outward projection, 21... notch, 22... stepped portion.

Claims (1)

[Scope of utility model registration request] A plurality of tabs are formed on the clutch cover at intervals in the circumferential direction, a pair of wire rings supported by the tabs clamps the intermediate fulcrum part of the diaphragm spring, and the pressure plate has a radial slit. In a clutch cover assembly that forms an annular fulcrum boss, contacts the outer periphery of the diaphragm spring with the fulcrum boss, and is equipped with a cone spring for peak cutting during wear-in, the outer periphery of the cone spring has an outward protrusion for preventing rotation. A notch is provided at the inner peripheral end through which the tab can pass, the cone spring is placed on the pressure plate side of the diaphragm spring, and the part of the inner peripheral end of the cone spring where the notch is not located is provided with a notch through which the tab can pass. A clutch cover assembly that is engaged with and supported by the cone spring, the outer peripheral end of the cone spring abuts the outer peripheral fulcrum of the diaphragm spring, and the outward protrusion is engaged with the slit.