JPH07190090A - Clutch disc for vehicle - Google Patents

Abstract

PURPOSE:To provide a clutch disc for vehicle which is excellent in stability of damping force by increasing the lap area between adjacent plates according to the relative rotating angles relatively moving according to the increase of the load added to a torsion spring. CONSTITUTION:When an oblong hole 33 and an oblong hole 34 are mutually superposed, the lap area between each plate for generating the shearing resistance of a viscous fluid is increased, compared with the case having no superposition, and the resulting damping force is therefore increased. In a viscous coupling 20, thus, when the driving force inputted to a clutch disc for vehicle is increased, the lap area between an inner plate 24 and an outer plate 25 adjacent to each other is increased to increase the shearing resistance of the viscous fluid, and the damping force is enhanced. When the driving force inputted to the clutch disc is small, on the contrary, the lap area between the inner plate 24 and the outer plate 25 is reduced to reduce the shearing resistance of the viscous fluid, and the damping force is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular clutch disc, and more particularly, to a vibration of a torsion spring interposed between a housing that rotates integrally with an insertion boss and a lining support plate that supports the clutch lining. The present invention relates to a vehicle clutch disc equipped with a vibration damping means capable of damping.

[0002]

2. Description of the Related Art Conventionally, a friction clutch is generally provided between an engine of an automobile and a manual transmission, and the driving force of the engine is transmitted to or cut off from the transmission in response to a driver's clutch pedal operation. You can The vehicle clutch disc in this type of friction clutch is
Generally, a bayonet boss engaged with the input shaft of the transmission,
A lining support plate that supports a clutch lining that is pressed against the flywheel of the engine, and the lining support plate is rotatable relative to the insertion boss in forward and reverse directions within a predetermined relative angular range around the axis. is there. or,
A torsion spring such as a coil spring is interposed between the two to absorb the impact in the rotational direction when the clutch lining comes into contact with the flywheel of the engine and also to the clutch lining via this torsion spring. The transmitted driving force of the engine is transmitted to the input shaft of the transmission.

Therefore, since the torsion spring repeatedly expands and contracts according to the magnitude of the driving force transmitted between the insertion boss and the lining support plate, when torsional vibration occurs due to torque fluctuation of the engine, these insertion springs are inserted. Relative rotational vibration occurs between the boss and the lining support plate. Therefore, in order to damp such relative rotational vibration, various vehicle clutch disks have been proposed in which various forms of vibration damping means are interposed between the insertion boss and the lining support plate.

For example, as in the clutch disc disclosed in Japanese Patent Laid-Open No. 63-115915, a torsion spring is arranged between the housing and the lining support plate which rotate integrally with the insertion boss, and the insertion boss. There is a vibration damping means in which a viscous fluid coupling (viscus coupling) is disposed between the lining support plate and the lining support plate so that a damping force proportional to the relative angular velocity between the insertion boss and the lining support plate can be obtained.

The vibration damping means provided with such a viscous coupling produces a damping action even when a vibration system moment appears when there is no load, and the vibration damping degree is set to the relative angular velocity between the insertion boss and the lining support plate. It can be increased proportionally. Further, the vibration damping means operates without wear, and is not affected by fluctuations in the friction coefficient of the clutch lining.

[0006]

By the way, the vehicle clutch disc is subjected to a large driving force generated by the engine, such as when the vehicle starts or when the vehicle is traveling at high speed, or when the vehicle is idling or at a constant speed. A small engine load may act like when driving at low speed. Therefore,
The viscous coupling as a vibration damping means,
The vibration damping characteristics that can absorb the vibration by applying the optimum damping force even when the relative rotational vibration occurs when the engine load is large and when the relative rotational vibration occurs when the engine load is small Desired.

However, the above-mentioned viscous coupling merely generates a damping force due to the shear resistance of the viscous fluid proportional to the relative angular velocity between the insertion boss and the lining support plate, and responds to changes in engine load. Damping force cannot be generated. Therefore, when the viscous coupling is set so that a large damping force can be obtained when the engine load is large, the damping force is too large and the vibration is transmitted when the engine load is small. When the viscous coupling is set so that a sufficient damping force can be obtained under a small load, the damping force is small under a large engine load and the vibration cannot be sufficiently damped. There is a problem in that good vibration damping cannot be performed.

Further, each plate that engages with the insertion boss or the lining support plate in the rotational direction in the working chamber of the viscous coupling is provided with an opening for distributing viscous fluid between the plates. A small amount of air is enclosed in the working chamber together with the viscous fluid so that the expansion of the volume of the viscous fluid can be absorbed when the temperature of the viscous coupling becomes high. Since the pressure in the opening becomes lower than the pressure between the plate surfaces, the air is bubbled and collects in the opening. Therefore, this air flows out from the inside of the opening in the circumferential direction of the plate surface along with the operation of the viscous coupling, and intervenes as an air film between the plates.

However, as shown in FIG. 9, in the conventional viscous coupling 90, for example, the opening 92 provided in the outer plate 91 has a slit shape extending in the radial direction, so that the air film A is formed.
Is not stable because it is located radially outside or inside the opening 92. Since the viscous fluid does not exist in the portion of the air film A, the damping force based on the shear resistance of the viscous fluid does not act between the plates corresponding to the air film A.

Therefore, since the position of the air film A is not stable in the radial direction, the magnitude of the damping force generated by the viscous coupling is not stable, and in the conventional viscous coupling as vibration damping means provided in the clutch disc. Had a problem that the magnitude of its damping force was not stable. Therefore, an object of the present invention is to solve the above-mentioned problems, and the damping force of the relative rotational vibration generated between the insertion boss of the clutch disc and the lining support plate is changed according to the magnitude of the load acting on the clutch disc. Another object of the present invention is to provide a vehicle clutch disc equipped with good vibration damping means that is capable of achieving stable damping force.

[0011]

The above object of the present invention is to provide a housing that rotates integrally with the insertion boss, a lining support plate that supports the clutch lining, and an interposition between the housing and the lining support plate. In a vehicle clutch disk comprising a torsion spring capable of transmitting torque and a vibration damping means capable of damping the vibration of the torsion spring, the vibration damping means is formed between the insertion boss and the lining support plate and is a viscous fluid. And a pair of plate sets that are alternately arranged in the working chamber and are engaged with the insertion boss and the lining support plate in the rotational direction, respectively. A plurality of openings extending in the circumferential direction with an angular range are arranged on the same circumference and the radius is Are arranged in parallel along the direction, and are configured so that the lap area between adjacent plates increases in accordance with the relative rotation angle of each other that moves relative to each other as the load applied to the torsion spring increases. This is achieved by a vehicle clutch disc.

The opening extending in the circumferential direction within a predetermined angle range is an elongated hole extending in the circumferential direction, a circular hole group including a plurality of circular holes arranged in the circumferential direction, or the like. Can be used. Further, by making each of the openings asymmetrical with respect to the plate center line, the lap area between the adjacent plates can be continuously changed according to the relative rotation angle of the relative movement.

[0013]

According to the above construction, as the driving force input to the clutch disc increases or decreases, the amount of deflection of the torsion spring changes and the relative rotation angle of each plate set increases or decreases. Therefore, when the deflection amount of the torsion spring is small and the relative rotation angle of each plate group is small, the openings of the adjacent plates do not overlap each other, so that shear resistance of the viscous fluid is generated between the adjacent plates. The wrap area between the plates is small and the resulting damping force is small. On the contrary, when the deflection amount of the torsion spring is large and the relative rotation angle of each plate group is large, the openings of adjacent plates overlap each other and the lap area between the plates that causes shear resistance of viscous fluid increases. Therefore, the obtained damping force becomes large.

Further, since the openings extending in the circumferential direction are arranged on the same circumference and are arranged in parallel along the radial direction, air bubbles in the working chamber captured by the openings are generated. An air film is formed by flowing along the circumferential direction on the plate surface between adjacent plates. Therefore, since the air film is generated only on the plate surface along the circumferential direction of the plate radial position where the opening is formed and does not spread on the other plate surface, the plate facing area of the air film generating unit is It becomes smaller, and the plate-facing area of viscous fluid becomes larger.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle clutch disk according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, the structure of the vehicle clutch disc 10 according to the first embodiment will be described with reference to FIG.

The vehicle clutch disc 10 includes a housing 12 that rotates integrally with the insertion boss 11, a lining support plate 14 that supports the clutch lining 15, and a housing 12 and the lining support plate 14. Torsion spring 18 that can transmit torque
And a viscous coupling 20 which is a vibration damping means capable of damping the vibration of the torsion spring 18.

The insertion boss 11 has a spline 11a provided on its inner peripheral surface engaged with an input shaft of a transmission (not shown) in the rotational direction, and a spline 11b provided on its outer peripheral surface will be described later. The housing 12 and the inner plate 24 of the viscous coupling 20 are rotationally engaged with each other. The inner plate 24 in the first embodiment is spline-fitted to the spline 11b via the inner joint member 22 fitted to the spline 11b.

The housing 12 is formed by stacking a pair of annular plate members so as to be coaxial with each other, and the radially inner peripheral portion thereof is expanded in the axial direction to accommodate the viscous coupling 20, and the outer peripheral portion thereof. Are superposed so as to movably sandwich a lining support plate 14 described later. The radially inner peripheral end portion is spline-fitted near both ends of the spline 11b outside the insertion boss 11 and is prevented from coming off by the snap ring 13.

The lining support plate 14 is a substantially annular plate member, and a clutch lining 15 which is pressed against a flywheel of an engine (not shown) is fixed to the outer peripheral side portion by rivets 16. Further, an inner peripheral side portion thereof constitutes a part of an outer joint member 23 which is fitted to the inner joint member 22 so as to be rotatable relative to the inner joint member 22 to define the working chamber 21, and a spline is formed on the inner peripheral surface thereof. Has been formed.

Further, the lining support plate 14 is sandwiched so as to be rotatable relative to the housing 12, but a sleeve is provided in an elongated hole 19 provided so as to extend in the circumferential direction of the lining support plate 14. A rivet 28 crimped to the housing 12 is inserted so as not to press the lining support plate 14 by 17, and a relative rotation angle of the lining support plate 14 with respect to the housing 12 is within a range defined in forward and reverse rotation directions. Limited to within.

In addition, the drive force is transmitted between the housing 12 and the lining support plate 14, and the impact in the rotational direction when the clutch lining 15 is brought into contact with the flywheel of the engine is absorbed. A coil spring 18, which is a torsion spring, is interposed. The coil springs 18 correspond to each other and the housing 1
2 and the lining support plate 14 are received in windows 29 provided at equal intervals in the circumferential direction.

Next, the viscous coupling 20 which is the vibration damping means in the vehicle clutch disc 10 of the first embodiment will be described. The viscous coupling 2
Reference numeral 0 denotes a plurality of inner plates 24 and outer plates formed by punching thin plates into an annular shape in the working chamber 21 defined by the inner joint member 22 and the outer joint member 23 and sealed by the rolling packing 27. 25 are alternately arranged and a viscous fluid such as silicone oil is enclosed.

An inner peripheral portion of the inner plate 24 is rotationally engaged with the inner joint member 22 via a spline so as to rotate integrally with the housing 12. An outer peripheral portion of the outer plate 25 is rotationally engaged with the outer joint member 23 via a spline, so that the lining support plate 14
Rotates integrally with. Also, these inner plates 24
In the outer plate 25, as shown in FIG. 2, a plurality of elongated holes 33 and 34, which are circumferentially extending in a predetermined angular range, are arranged at equal intervals on the same circumference. And are arranged side by side along the radial direction.

Then, the inner plates 24 adjacent to each other
And these long holes 33 and long holes 3 of the outer plate 25.
No. 4 does not overlap each other when the relative rotation position of the lining support plate 14 with respect to the housing 12 is the initial position shown in FIG. 2, and the lining support plate 14 rotates relative to the housing 12 in forward and reverse rotation directions. Accordingly, the adjacent long holes 33 and the long holes 34 are arranged so as to gradually overlap with each other.

Next, the operation of the viscous coupling 20 will be described. First, the vehicle clutch disc 1
When the driving force input to 0 is small, the elastic biasing force of the coil spring 18 interposed between the clutch housing 12 and the lining support plate 14 causes the clutch housing 12 and the lining support plate 14 to move relative to each other. The rotation position is almost the initial position, and the relative rotation angle is small.
Therefore, as shown in FIG.
The long hole 33 provided in the outer plate 25 and the long hole 33 provided in the outer plate 25 do not overlap with each other.

On the other hand, the vehicle clutch disc 1
When a large driving force is input to 0, the clutch housing 12 and the lining support plate 14 compress the coil spring 18 interposed between the clutch housing 12 and the lining support plate 14 and relatively rotate, and the clutch housing 12 and the lining support plate 14 rotate relative to each other. The rotation angle becomes the maximum value θ. Along with this, as shown in FIG. 3, the relative rotation angle between the inner plate 24 and the outer plate 25 also becomes θ, so that the long hole 33 provided in the inner plate 24 and the long hole 34 provided in the outer plate 25. Overlap with each other.

As a result, when the long holes 33 and the long holes 34 overlap each other, the lap area between the plates for generating shearing resistance of the viscous fluid becomes larger than that in the case where they do not overlap each other. Will be large. Therefore, in the viscous coupling 20, when the driving force input to the vehicle clutch disc 10 increases, the lap area of the inner plate 24 and the outer plate 25 adjacent to each other increases, and the shear resistance of viscous fluid increases. The damping force increases. On the contrary, when the driving force input to the vehicle clutch disc 10 is small, the lap area of the inner plate 24 and the outer plate 25 is reduced, the shear resistance of the viscous fluid is reduced, and the damping force is reduced.

That is, in the vehicle clutch disk 10 of the first embodiment, the damping force of the viscous coupling 20 changes according to the input load, so that the insertion boss 1
It is possible to always optimize the damping force of the relative rotational vibration generated between the gear 1 and the lining support plate 14 in accordance with the running conditions of the vehicle. For example, when a large driving force is input to the vehicle clutch disc 10 and clutch vibration starts, such as when the vehicle starts or runs at high speed, the viscous coupling 20 generates a large damping force and starts. It is possible to quickly damp the vibration associated with. Even when the driving force is not large like when driving at a constant low speed, the clutch vibration is absorbed by the optimum damping force even when the transmission resonates due to engine torque fluctuations and a muffled noise is generated in the vehicle. Then, the unpleasant muffled sound can be reduced.

Further, as schematically shown in FIG. 8, for example, a plurality of elongated holes 34 provided in the outer plate 25.
The air bubbles trapped and accumulated in the air leak out along the circumferential direction on the plate surface of the outer plate 25 by the operation of the viscous coupling 20 to form the air film A. Are formed so as to have a narrow width and extend in the circumferential direction, are arranged on the same circumference, and are arranged in parallel along the radial direction. Then, the bubble-like air captured and accumulated by the elongated holes 34 flows along the circumferential direction on the plate surface between adjacent plates to form an air film A. The air film A is the elongated holes. Since 34 is formed only on the plate surface along the circumferential direction of the plate radial position where it is formed and does not spread on other plate surfaces, the plate facing area of the air film generating unit becomes small and the viscous fluid plate facing As the area increases, the position of the air film A stabilizes without being displaced in the radial direction, and the damping force generated by the viscous coupling 20 of the first embodiment is affected by the position of the air film A. It does not become unstable.

It is needless to say that the openings formed in each of the plates are not limited to the shape and number of the above-mentioned embodiment, and can take various shapes. The viscous coupling 40, which is the vibration damping means for the vehicle clutch disc according to the second embodiment of the present invention shown in FIGS. 4 and 5, is applied to the inner plate 24 and the outer plate 25 of the viscous coupling 20 of the above embodiment. All are the same except that the inner plate 41 and the outer plate 42 are used instead.

As shown in FIG. 4, in the inner plate 41 of the viscous coupling 40 of the second embodiment, a substantially triangular opening tapered in the counterclockwise direction in the drawing extending in the circumferential direction with a predetermined angle range. 45 and substantially triangular openings 46 that taper in the clockwise direction in the drawing are arranged at equal intervals on the same circumference and arranged in parallel in the radial direction. Similarly, the outer plate 42 has a substantially triangular opening 47 that extends in the circumferential direction with a predetermined angle range and that tapers in the counterclockwise direction in the drawing and a substantially triangular opening that tapers in the clockwise direction in the drawing. 48 are arranged at equal intervals on the same circumference and are arranged in parallel along the radial direction. That is, the openings 45, 46 and the openings 47, 48 of the inner plate 41 and the outer plate 42 are asymmetric with respect to the plate center line.

Then, the inner plates 41 adjacent to each other
The openings 45, 46 and the openings 47, 48 of the outer plate 42 do not overlap each other when the relative rotational position of the lining support plate 14 with respect to the housing 12 is the initial position shown in FIG.
As the lining support plate 14 relatively rotates in the forward and reverse rotation directions with respect to 2, the adjacent openings 45 and 46 and the openings 47 and 48 are tapered as shown in FIG. The parts are arranged so that they gradually overlap with each other.

As a result, as the relative rotation angle of the outer plate 42 with respect to the inner plate 41 in the forward and reverse rotation directions increases, the lap area between adjacent plates continuously and slowly increases. The damping force generated between the insertion boss 11 and the lining support plate 14 is set to have a characteristic of continuously and slowly increasing.

The viscous coupling 50, which is the vibration damping means for the vehicle clutch disk according to the third embodiment of the present invention shown in FIGS. 6 and 7, is the inner plate 41 of the viscous coupling 40 of the second embodiment. Also, all are the same except that an inner plate 51 and an outer plate 52 are used instead of the outer plate 42.

That is, as shown in FIG. 6, the inner plate 51 of the viscous coupling 50 of the third embodiment is arranged along the circumferential direction as openings extending in the circumferential direction within a predetermined angular range. The circular hole group 53 having a plurality of circular holes each having a smaller diameter in the clockwise direction in the drawing and the circular hole group 54 having a plurality of circular holes each having a smaller diameter in the counterclockwise direction in the drawing have the same circle. They are arranged at equal intervals on the circumference and are arranged in parallel along the radial direction. Further, in the outer plate 52, a plurality of circular holes whose diameters are arranged in the circumferential direction and become smaller in the clockwise direction in the drawing are formed as openings extending in the circumferential direction in the same angular range. A group 55 of circular holes and a group 56 of circular holes smaller in the counterclockwise direction in the figure are arranged at equal intervals on the same circumference and arranged in parallel along the radial direction. Has been done. That is, the circular hole groups 53 and 54 and the circular hole groups 55 and 56 of the inner plate 51 and the outer plate 52 are asymmetric with respect to the plate center line.

Then, adjacent inner plates 51
The circular hole groups 53, 54 and the circular hole groups 55, 56 of the outer plate 52 do not substantially overlap each other when the relative rotational position of the lining support plate 14 with respect to the housing 12 is the initial position shown in FIG. Figure 7
As shown in FIG. 5, when the lining support plate 14 rotates relative to the housing 12 in the forward and reverse rotation directions, the lining support plate 14 is arranged so as to gradually overlap with the circular hole having a small diameter.

As a result, as the relative rotation angle of the outer plate 52 with respect to the inner plate 51 in the forward and reverse rotation directions increases, the openings 53 and 54 become
Since the circular holes having small diameters gradually overlap with each other, the lap area between each plate that causes shear resistance of viscous fluid between adjacent plates gradually increases continuously, and the viscous coupling 50 supports the insertion boss 11 and the lining. The damping force generated between the plate 14 and the plate 14 is set so as to continuously and slowly increase.

The vehicle clutch disc of the present invention is
The configuration and the shape of each component in each of the above-described embodiments are not limited, and, for example, the housing, the lining support plate, the torsion spring, each plate set, and the like can take various forms based on the gist of the present invention. Further, the engaging means for engaging the respective plate sets with the insertion boss and the lining support plate in the rotational direction is not limited to the spline connection as in the above embodiment, and each plate set is integrated with the insertion boss and the lining support plate, respectively. Direct rotation or indirect engagement may be used as long as the rotation is possible.

[0039]

According to the vehicular clutch disc of the present invention, when the driving force input to the clutch disc is small and the deflection amount of the torsion spring is small, it is arranged between the insertion boss and the lining support plate. The lap area between adjacent plates in each plate set of the viscous coupling is small, and the damping force of the viscous coupling is small. Further, when the driving force input to the clutch disc is large and the bending amount of the torsion spring is large, the lap area between adjacent plates of each plate set becomes large, and the damping force of the viscous coupling becomes large. .

Therefore, the damping force of the viscous coupling changes according to the load input to the clutch disc, and the damping force of the relative rotational vibration generated between the insertion boss and the lining support plate changes according to the running conditions of the vehicle. Can always be optimal. Further, since the openings extending in the circumferential direction are arranged on the same circumference and arranged in parallel along the radial direction, air bubbles in the working chamber captured by the openings are adjacent to each plate. Flowing along the circumferential direction on the plate surface between them, an air film is formed.

Therefore, since the air film is generated only on the plate surface along the circumferential direction of the plate radial position where the opening is formed and does not spread on other plate surfaces, the plate of the air film generating portion is formed. The facing area becomes smaller, the facing area of the viscous fluid plate becomes larger, and the position of the air film is stabilized without being displaced in the radial direction.

Therefore, the damping force of the relative rotational vibration generated between the insertion boss of the clutch disc and the lining support plate can be changed according to the magnitude of the load acting on the clutch disc, and the stability of the damping force can be improved. It is possible to provide a vehicular clutch disc equipped with excellent vibration damping means.

[Brief description of drawings]

FIG. 1 is a partial sectional side view of a vehicle clutch disc according to a first embodiment of the present invention.

FIG. 2 is a front sectional view of relevant parts for explaining a viscous coupling operating state of the vehicle clutch disc shown in FIG.

FIG. 3 is a front sectional view of a main part for explaining a viscous coupling operating state of the vehicle clutch disc shown in FIG. 1.

FIG. 4 is a front sectional view of an essential part for explaining a viscous coupling operation state of a vehicle clutch disc according to a second embodiment of the present invention.

FIG. 5 is a front sectional view of an essential part for explaining a viscous coupling operation state of a vehicle clutch disc according to a second embodiment of the present invention.

FIG. 6 is a front sectional view of an essential part for explaining a viscous coupling operation state of a vehicle clutch disc according to a third embodiment of the present invention.

FIG. 7 is a front sectional view of relevant parts for explaining a viscous coupling operation state of a vehicle clutch disc according to a third embodiment of the present invention.

8 is a front sectional view of relevant parts showing an air film generation state in the viscous coupling of the vehicle clutch disc shown in FIG.

FIG. 9 is a front sectional view of relevant parts showing an air film generation state in a viscous coupling of a conventional vehicle clutch disc.

[Explanation of symbols]

 10 Vehicle Clutch Disc 11 Insertion Boss 12 Housing 14 Lining Support Plate 15 Clutch Lining 18 Coil Spring 20 Viscous Coupling 21 Working Chamber 22 Inner Joint Member 23 Outer Joint Member 24 Inner Plate 25 Outer Plate 33 Long Hole 34 Long Hole

Claims (1)

[Claims] 1. A housing that rotates integrally with an insertion boss, a lining support plate that supports a clutch lining, a torsion spring that is interposed between the housing and the lining support plate, and is capable of transmitting torque, and the torsion spring. A vehicle-use clutch disc comprising: a vibration damping means capable of damping the vibration of the above; and a vibration damping means, wherein the vibration damping means is formed between the insertion boss and the lining support plate and filled with a viscous fluid, and the working chamber. And a pair of plate sets respectively engaged with the insertion boss and the lining support plate in the rotational direction, the plurality of openings extending in the circumferential direction in a predetermined angular range. The parts are arranged on the same circumference and are arranged in parallel along the radial direction. The vehicle clutch disc, wherein the wrap area between the plates adjacent in accordance with the relative rotation angle of each other for relative movement with increasing load on the Deployment spring is configured to increase.