JPH074446A - clutch - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a clutch capable of further improving the durability of each member having a sliding contact surface of the clutch. [Structure] A flywheel 2, a clutch cover 4, a clutch disc 7 having an annular metal plate 5 and rotating integrally with a clutch output shaft 6 side, and a joint surface 3 of the flywheel 2 under the pressure of a spring 9. The pressure plate 8 that presses the annular metal plate 5 against, the clutch operating means 10 that applies the clutch disengaging operation force, and the joint surface 3 of the flywheel 2.
On the joining surface 15 of the pressure plate 8, the first annular groove 12 that is recessed upward, the first clutch facing 14 that is pressed against the annular metal plate 5 and the annular lower wall surface 13 of the first annular groove 12, and the pressure plate 8. And a second clutch facing 19 which is loosely fitted in the second annular groove 17 and is pinched between the annular metal plate 5 and the annular lower wall surface 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device for intermittently connecting a drive source and a driven side, and more particularly to a clutch having a single clutch disc between a pressure plate and a flywheel.

[0002]

2. Description of the Related Art A power transmission system connecting an engine side and a wheel side of a vehicle is equipped with a clutch. This clutch disengages the engine from the transmission side by a clutch disengagement operation to shift gears. It also has a function of absorbing the rotation difference between the engine and the transmission side at the time of starting or shifting the vehicle by a sliding action.
Among the conventional clutches, the dry single-plate friction clutch has a relatively small number of parts, a relatively low cost, and a small clutch intermittent operation force. Therefore, it is widely used as a vehicle clutch. Usually, a dry single-plate friction clutch of this type is provided between a flywheel integrated with a crankshaft on the engine side and a clutch output shaft which is a main shaft of a gear type transmission. In this case, the output shaft is equipped with a spline-fitting clutch disc,
The clutch disc can be clamped by a flywheel and a pressure plate to join the clutch, or the clutch can be released by a clutch disengaging operation to disengage the clutch.

That is, here, a flywheel is integrally provided with a sheet metal clutch cover, which is supported by the clutch cover and is equipped with a pressure plate for applying a pressing force to the clutch disc by a diaphragm type spring. . Here, by applying a clutch disengaging operation force to the center side end of the diaphragm type spring, the spring is levered between the center side and the peripheral side, and the pressure plate connected to the peripheral side is connected to the clutch disc side. By disengaging the clutch to disengage the clutch and releasing the clutch disengagement operation force from the diaphragm type spring, the spring applies its elastic force to the clutch disc via the pressure plate to join the clutch. It

[0004]

In such a dry single-plate friction clutch, both sides of the clutch disc are at one end against the sliding contact surfaces of the pressure plate and the flywheel each time the clutch disengaging operation force is applied. As the clutch is disengaged and then the disengagement operation is returned, the relative rotational difference between the engine side and the clutch disk on the driven side is gradually reduced, and eventually, the clutch engagement / disengagement operation is resumed so as to return to the integrally rotating state. During such a clutch connecting / disconnecting operation, especially when the clutch operating force suddenly changes, a large frictional force is impulsively applied to each friction surface of the clutch, and a large amount is applied to both facings and the pressure plate side of the clutch desk. Torque impact tends to be applied and problems with the durability of these parts tend to occur. An object of the present invention is to provide a clutch that can further improve the durability of each member having the sliding contact surface of the clutch.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a flywheel on the engine side, a clutch cover integrally connected to the flywheel, an annular metal plate on the outer peripheral portion, and a clutch. A clutch disc that rotates integrally with the output shaft side, a pressure plate that is supported by the clutch cover and that presses an annular metal plate against the joint surface of the flywheel under the pressure of a spring, and the pressure plate. Clutch operation means for applying a clutch disengaging operation force that pulls away from the joint surface side against the pressing force of the spring, and a concave surface provided on the joint surface of the flywheel opposite to one sliding contact surface of the annular metal plate. A first annular recessed groove, and the first annular recessed groove is slidably fitted into the first annular recessed groove in the direction of the rotation center line and around the same center line, and the ring An annular first clutch facing sandwiched between the metal plate and the annular lower wall surface of the first annular groove is opposed to the other sliding contact surface of the annular metal plate on the joint surface of the pressure plate. A second annular groove formed in the surface, and a second annular groove that is slidably fitted in the second annular groove so as to be slidable in the direction of the rotation center line and around the same center line. And an annular second clutch facing which is sandwiched between the groove and the annular lower wall surface.

[0006]

The flywheel is in sliding contact with one surface of the annular metal plate of the clutch disc through the first clutch facing which is rotatably supported in the first annular groove, and the pressure plate is in the second annular groove. The pair of first and second clutch facings slides relative to the other surface of the annular metal plate of the clutch disc through the second clutch facing which is rotatably supported, so that the relative rotational difference between the flywheel and the clutch disc. Rotate according to
This rotation difference can be dispersed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The clutch shown in FIG. 1 is installed in a power transmission system of an engine mounted on a vehicle (not shown). This clutch includes a flywheel 2 integrally connected to a crankshaft 1 of an engine (not shown), and a clutch disc 7 spline-fitted to an output shaft 6 following a gear type transmission (not shown).
A clutch cover 4 integrally connected to the outer peripheral edge of the flywheel 2; a pressure plate 8 supported by the clutch cover 4 via a diaphragm spring 9; and a clutch disconnection operation force applied to the center side end of the diaphragm spring 9. And a clutch operating means 10 for adding. here,
The flywheel 2 has a ring gear 20 projectingly provided on its outer peripheral end, which engages with a starter (not shown), and has a joint surface 3 on one side thereof for contacting and separating from the pressure plate.

The clutch disc 7 is provided with a ring-shaped metallic annular metal plate 5 which is sandwiched by a pressure plate 8 and a flywheel 2 so as to be contactable and separable, and a boss 22 integral with the clutch hub 21 has an output shaft 6. Fit the spline to. The clutch hub 21 is equipped with a clutch plate 23 which is provided on both sides of the clutch plate 21 and is integrally coupled to each other, and the annular metal plate 5 is integrally coupled to the outer peripheral end of the clutch plate 23 of the same pair. Between the pair of clutch plates 23 and the clutch hub 21, a well-known torsion spring 24 and a friction adding member 25 for adding hysteresis are installed. The pressure plate 8 is in the form of a ring plate having a meat pressure, and is provided with a joint surface 15 for pressing the annular metal plate 5 on the joint surface 3 of the flywheel, and on the other surface, an engaging projection 26 with the diaphragm type spring 9. Is formed. The engaging protrusion 26 has an annular shape, and brackets 27 that are integrally connected to the pressure plate 8 are provided at three positions of the engaging protrusion 26, and the spring 9 is irremovably locked by the bracket.

The diaphragm type spring 9 is supported by the clutch cover 4 at a plurality of positions via pins 28 having locking portions. In FIG. 1, reference numeral 29 is a ring-shaped fulcrum spring that abuts on both sides of the diaphragm spring 9, and the diaphragm spring 9 is operated as a lever between the center side and the peripheral edge side with the fulcrum spring 29 as a fulcrum. Then, the pressure plate 8 connected to the peripheral edge side is disengaged from the clutch disc 7 to disengage the clutch, and conversely, the clutch disengaging operation force is released from the diaphragm spring 9, so that the spring exerts its elastic force. Can be added to the clutch disc 7 via.

A clutch operating means 10 for applying a clutch disengaging operation force to the center side of the diaphragm spring 9 includes a release bearing 101 slidably fitted on a cylindrical portion 30 protruding from a clutch housing (not shown), and a release bearing 101. A release fork 103 that applies a clutch disengagement operation force to the holder 102, and a clutch operation system (not shown) that is interlocked with the release fork 103. The first annular groove 1 is formed on the joint surface 3 of the flywheel 2 on the surface facing the one sliding contact surface 11 of the annular metal plate 5.
2 is recessed. In the first annular groove 12, the rotation center line L
An annular first clutch facing 14 is loosely fitted so as to be slidable in the 0 direction and around the center line. The first clutch facing 14 is pinched between the annular metal plate 5 and the annular lower wall surface 13 of the first annular groove 12 when the clutch is engaged.

On the other hand, the joint surface 15 of the pressure plate 8
A second annular groove 17 is formed in the upper surface of the annular metal plate 5 facing the other sliding contact surface 16. An annular second clutch facing 19 is loosely fitted in the second annular groove 17 so as to be slidable in the rotation center line L0 direction and around the same center line. The second clutch facing 19 is sandwiched between the annular metal plate 5 and the annular lower wall surface 18 of the second annular groove 17 when the clutch is engaged. Here, the first and second clutch facings 1
Both 4 and 19 have facing bodies 142 and 192 integrally formed on both sides of the metallic I-shaped holders 141 and 191 which have appropriate friction coefficients and are made of a material having high heat resistance and wear resistance. These are ring-shaped. In particular, as shown in FIG. 3, slip rings 31 made of a wear-resistant synthetic resin are fitted to the inner side surfaces 121 and 171 of the first and second annular recessed grooves 12 and 17 so as to be rotatable relative to each other. The slip ring 31 has two annular grooves 312 formed on the inner peripheral wall surface 311 thereof, thereby facilitating ensuring the lubricating oil between the slip ring 31 and the inner side surfaces 121, 171.

In FIG. 3, reference numeral 32 indicates a stopper member,
The first clutch facing 14 is prevented from disengaging from the first and second annular recessed grooves 12. When such a clutch receives the clutch disengaging operation force P by the clutch operating means 10 by depressing a clutch pedal (not shown), the disengagement operating force P is applied to the pressure plate 8 via the diaphragm spring 9, and the pressure plate 8 is applied to the clutch. Moving in the disengagement direction A, the clutch disc 7 is disengaged from the flywheel 2 and the pressure plate 8 on the engine side, and the clutch is disengaged.

When the clutch disengaging operation force P is gradually relaxed and returned, the pressure plate 8 moves in the joining direction B by the elastic force of the diaphragm spring 9. At this time, first, the annular metal plate 5 of the clutch disc is brought into sliding contact with the first and second clutch facings 14 and 19 of the flywheel 2 and the pressure plate 8, and the sliding contact is started in accordance with the relative rotation difference and the relative displacement is made. Narrow the gap. When the clutch disengagement operation force P is further returned and the pressure plate 8 moves in the joining direction B, the first and second clutch facings 14 and 19 cause the annular low wall surface 1 of the first and second annular recessed grooves 12.
The third and third clutch facings 14 and 19 also start sliding operation on both surfaces thereof. Here, the annular low wall surfaces 13 and 18 of the flywheel 2 or the pressure plate 8 on the engine side and the annular metal plate 5 of the clutch disc 7 are relatively slidably contacted with each other via the first and second clutch facings 14 and 19. The transfer of the rotating torque progresses, and eventually the flywheel 2 or the pressure plate 8 and the clutch disc 7 on the engine side are transferred.
The clutch disengaging operation force P is completely released and returned when the relative rotational difference between the two has disappeared, and the flywheel 2 on the engine side or the pressure plate 8 and the clutch disc 7 rotate integrally due to the elastic force of the diaphragm spring 9. .

As described above, in this clutch, when the clutch is engaged, the flywheel 2 or the pressure plate 8 on the engine side and the clutch disc 7 are brought into direct sliding contact with each other while reducing the relative rotation difference, and a part of the torque is applied. The transmission is not performed, but the flywheel 2 or the pressure plate 8 and the first and second clutch facings 1
It is said that a part of the rotation difference between the first and second clutch facings 14 and 19 and the annular metal plate of the clutch disc 7 is further absorbed by previously absorbing a part of the rotation difference between the first and second clutch facings 14 and 19. As described above, the rotation difference is dispersed and absorbed in stages. Therefore, even if a clutch connecting / disconnecting operation that causes an abrupt change is performed, the sliding contact surfaces of the flywheel 2, the pressure plate 8, the first and second clutch facings 14 and 19 or the clutch disc 7 are excessive. Durability can be secured without adding shocking joining force.

In the above-mentioned process, the clutch facings 14 and 19 are loosely fitted in the first and second annular recessed grooves 12 and 17 formed in the flywheel 2 or the pressure plate 8 on the engine side. Although the difference in rotation between the engine side and the output shaft side is dispersed and absorbed by the above, instead of this, as shown in FIG. 4, the first and the first formed on the flywheel 2 or the pressure plate 8 on the engine side. 2 in each of the two annular grooves 12 and 17
Clutch facings 14a, 14b, 19a,
You may employ | adopt the structure which loosely fitted 19b. In this case, the clutch facings 14b and 19b are in contact with both surfaces of the annular metal plate 5 of the clutch disc 7, and the other surfaces of the clutch facings 14b and 19b are respectively provided with the clutch facings 14a and 1b via the slip plates 33.
9a come into contact with each other, and these clutch facings 14a, 1
9a is flywheel 2 or pressure plate 8
The first and second annular recessed grooves 12, 17 formed in the above are contacted with the annular lower wall surfaces 13, 18.

Incidentally, here as well, the first and second annular concave grooves 12,
A slip ring 34 is fitted to the inner side surfaces 121 and 171 of 17 so as to be relatively rotatable. The slip ring 34 is formed with three annular grooves 342 on its inner peripheral wall surface 341, whereby the slip ring 34 and the inner side surfaces 121, 17 are formed.
It is easy to secure the lubricating oil during the period 1. In this case, in particular, the first and second annular concave grooves 1 formed in the flywheel 2 or the pressure plate 8 on the engine side.
Two clutch facings 1 in each of 2 and 17
4a, 14b, 19a, 19b are loosely fitted, and the rotational difference between the engine side flywheel 2 or the pressure plate 8 and the output shaft side clutch disc can be divided into two stages by these, so that the relative rotational difference at each sliding contact surface is reduced. It is dispersed and becomes smaller, and the durability of the sliding contact surface can be further improved.

[0017]

As described above, according to the present invention, the flywheel is in sliding contact with one surface of the annular metal plate of the clutch disc via the first clutch facing, and the pressure plate is in the annular form of the clutch disc via the second clutch facing. Since it is in sliding contact with the other surface of the metal plate, the pair of first
The second clutch facing rotates according to the relative rotation difference between the flywheel and the clutch disc, and this rotation difference can be dispersed, and the durability of each member having the sliding contact surface in the clutch can be further improved. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of a clutch as an embodiment of the present invention.

FIG. 2 is a front sectional view of a main part taken along line XX of FIG.

FIG. 3 is an enlarged sectional view of an essential part of the clutch shown in FIG.

FIG. 4 is a sectional view of a main part of a clutch according to another embodiment of the present invention.

[Explanation of symbols]

 2 flywheel 3 joining surface 4 clutch cover 5 clutch plate 6 output shaft 7 clutch disc 8 pressure plate 9 pressure plate 10 clutch operating means 12 first annular groove 13 annular low wall surface 14 first clutch facing 15 joining surface 18 annular low wall surface 19 2nd clutch facing 17 2nd annular groove P P clutch disconnection operation force L0 Rotation center line

Claims (1)

[Claims] 1. A flywheel on the engine side, a clutch cover that is integrally coupled to the flywheel, a clutch disc that has an annular metal plate on its outer periphery and that rotates integrally with the clutch output shaft side, and the clutch cover. And a pressure plate that presses the annular metal plate against the joint surface of the flywheel under the pressure of the spring and a clutch disconnection that separates the pressure plate from the joint surface side against the force of the spring. A clutch operating means for applying an operating force, a first annular groove formed on a surface of the flywheel facing the sliding contact surface of the annular metal plate, and a first annular groove formed in the first annular groove. Is slidably fitted in the direction of the rotation center line and around the same center line, and is pressed between the annular metal plate and the annular lower wall surface of the first annular groove. An annular first clutch facing, a second annular groove formed in a surface facing the other sliding contact surface of the annular metal plate on the joint surface of the pressure plate, and a second annular groove formed in the second annular groove. An annular second clutch facing that is slidably fitted in the direction of the rotation center line and around the same center line and is pinched between the annular metal plate and the annular lower wall surface of the second annular groove. Clutch I had.