JPH0341154Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotational fluctuation damping device for a clutch used in vehicles such as automobiles, and particularly to a rotational fluctuation damping device equipped with a hysteresis imparting structure that variably sets hysteresis torque. Related.

2. Description of the Related Art A clutch used to connect an internal combustion engine and a transmission in a vehicle such as an automobile generally has a hub of a clutch disk and a disk plate that can be displaced in the direction of rotation by an elastic member by a predetermined amount. It is equipped with a so-called rotational fluctuation buffer that connects.
Furthermore, a friction member is provided between the hub and the disk plate so as to obtain hysteresis torque, so that relative rotational fluctuations between the hub and the disk plate, that is, torsion, are accompanied by frictional resistance due to the sliding of the friction member. Clutches equipped with a hysteresis imparting structure are already known, and are shown in, for example, Japanese Unexamined Utility Model Publications No. 55-158328 and No. 59-77627.

Problems to be Solved by the Invention The clutch rotational fluctuation damper having a hysteresis structure as described above is provided to absorb rotational fluctuations of an internal combustion engine and suppress the occurrence of abnormal noise in the drive system. In order to prevent the occurrence of this abnormal noise, the hysteresis torque value needs to be variably set to an optimum value depending on the type of abnormal noise that changes depending on the output torque state of the internal combustion engine.

However, in the conventionally known hysteresis providing structure, the friction member is given a pressing force by a spring member such as a cone spring or a wave spring, and this pressing force does not substantially change. Only one hysteresis torque value can be obtained depending on the provided structure.
For this reason, conventionally it has been considered to use a combination of a spring and rubber as the torsion elastic member provided between the hub and the disk plate so that the hysteresis torque value changes in two stages. However, even if the hysteresis torque value changes in two stages, it is still not sufficient and the optimum torsion characteristics cannot be obtained.

The object of the present invention is to provide an improved clutch rotational fluctuation damping device that solves the above-mentioned problems.

Means for Solving the Problems According to the present invention, the above-mentioned object is to reduce the rotational fluctuation of a clutch in which the hub of the clutch disk and the disk plate are connected by an elastic member such that they can be displaced by a predetermined amount in the rotational direction of each other. In the shock absorbing device, a thrust plate made of a magnetic material is engaged to prevent rotation from at least one of the disk plate and a sub-plate connected substantially integrally with the disk plate, and the thrust plate is attached to the hub and is connected to the thrust plate. This is accomplished by a clutch rotational fluctuation damper having an electromagnet that magnetically attracts the hub and a friction material plate sandwiched between the thrust plate and the hub.

According to the above-described configuration, since the magnetic attraction force of the electromagnet changes steplessly depending on the current applied to the electromagnet, the substantial pressing force of the friction material plate also changes steplessly accordingly. , the hysteresis torque value can be freely set steplessly. This makes it possible to set the torsion characteristics of the clutch to an optimum value depending on the output torque of the internal combustion engine, etc.

Embodiment FIG. 1 shows an embodiment of the clutch rotation fluctuation damping device according to the present invention. In the figure, 1
0 indicates the entire clutch disk, and clutch disk 10 includes hub 12 and disk plate 1.
4.

The hub 12 is adapted to be spline-fitted with a shaft member (not shown) by a spline 16 provided on its inner peripheral surface. An annular mounting plate 18 is fixedly connected to the disk plate 14, and facings 20 made of a suitable friction material are attached to both sides of the mounting plate 18. Cover plates 24 are attached to one side of the disk plate 14 by connecting pins 22 in parallel with each other at a predetermined interval. disk plate 1
4 is disposed on one side of the disk portion 11 of the hub 12, and the cover plate 24 is disposed on the other side of the disk portion 11. In other words, the disk plate 14 and the cover plate 24 cover the disk portion 11 of the hub 12 in its axial direction. They are provided so as to be sandwiched between them, and both are rotatable with respect to the hub 12.

An opening 26 is provided, and a torsion spring 2 made of a compression coil spring is installed in this opening 26.
8 is provided. Torsion spring 28
engages with the hub 12, the disk plate 14, and the cover plate 24, and connects the hub 12, the disk plate 14, and the cover plate 24 so that they can be elastically displaced by a predetermined amount in the rotational direction of each other.

Annular thrust plates 30 and 32 are provided between the disk plate 14 and the disk portion 11 and between the cover plate 24 and the disk portion 11, respectively.
are arranged respectively. The thrust plates 30 and 32 are each made of a magnetic material such as a steel plate, and the thrust plate 30 engages with the disk plate 14 at an engagement piece 31 to prevent rotation, and the thrust plate 32 engages with the disk plate 14 at an engagement piece 33. It is non-rotatably coupled to plate 24, and both are movable in the axial direction. One electromagnet 38 or a plurality of electromagnets 38 made of a coil 34 and a core 36 are embedded in the disk portion 11 of the hub 12 and are spaced apart from each other in the circumferential direction. The electromagnets 38 are exposed on both sides of the disk part 11 and are attached to the thrust plate 3 with electromagnet covers 42 and 44 attached to both sides of the disk part 11 by mounting pins 40.
0 and 32, respectively. An annular friction material plate 46 is provided between the thrust plate 30 and the electromagnet cover 42;
Another annular friction material plate 48 is provided between the electromagnet cover 44 and the electromagnet cover 44 .

A current collecting brush 50 for energizing the coil 34 is attached to the hub 12, and this current collecting brush 50 is slidably engaged with a slip ring 54 attached to the inner circumferential surface of the retainer 52. It is designed to be supplied with current.

According to the above-described configuration, when the coil 34 is energized and the electromagnet 38 is excited, the thrust plates 30 and 32 engage the disk portion 11 of the hub 12 with the friction material plates 46 and 48 in between, respectively.
As a result, a pressing force corresponding to the magnetic attraction force is applied to the friction material plates 46 and 48, and a hysteresis torque is provided by frictional resistance corresponding to the pressing force. The magnetic attraction force of the electromagnet 38 is applied to the coil 34 and changes according to the current. Therefore, by variably controlling the current applied to the coil 34, the magnetic attraction force of the electromagnet 38 changes and changes accordingly. The pressing force of the friction material plates 46 and 48 changes, so that the hysteresis torque can be freely and variably set according to the current applied to the coil 34.

The energization control for the coil 34 of the electromagnet 38 may be performed in accordance with the output torque of the internal combustion engine, and an example of this control system is shown in FIG.
The control system shown in FIG. 2 includes an electric control device 60 having an arithmetic function such as a microcomputer, and the control device 60 receives information regarding the accelerator opening from an accelerator opening sensor 62, and also receives information about the accelerator opening from an accelerator opening sensor 62. Information regarding the rotation speed of the internal combustion engine is given from the number sensor 64, the output torque of the internal combustion engine is calculated according to this information, and a control signal is output to the drive circuit 65 of the electromagnet 38 according to this output torque. The current applied to the coil 34 is controlled according to the output torque of the internal combustion engine.

FIG. 3 shows torsion characteristics when the current applied to the electromagnetic coil 34 of the electromagnet 38 is controlled in three stages according to the output torque of the internal combustion engine. In this case, the clutch hysteresis torque is _H1 and _H2 .
_H3 changes to three values, and the torsional characteristics approach the optimal characteristics.

In the clutch rotation fluctuation damping device according to the present invention, the hysteresis torque setting is not limited to a stepwise setting, and the current applied to the coil 34 of the electromagnet 38 is continuously and variably controlled. It may be performed continuously and steplessly depending on the output torque.

Furthermore, the clutch hysteresis torque may be set variably between when the vehicle is idling and when the vehicle is running. It is determined whether the vehicle is idling or stopped according to the shift position of the transmission detected by the sensor 68, and when the vehicle is running, the virtual line in FIG. As shown in , it is sufficient if the hysteresis torque is set to be increased even in the torque range.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto, and various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the main parts of a clutch rotational fluctuation damper according to the present invention, FIG. 2 is a block diagram showing an example of a control system for the clutch rotational fluctuation damper according to the present invention, and FIG. 3 is a graph showing torsional characteristics obtained by the clutch rotational fluctuation damping device according to the present invention. 10...Clutch disc, 11...Disk portion, 12...Hub, 14...Disc plate,
16... Spline, 18... Mounting plate, 20...
Facing, 22... Connection pin, 24... Cover plate, 26... Opening for attaching elastic member, 28
... Torsion spring, 30 ... Thrust plate, 31 ... Engagement piece, 32 ... Thrust plate, 33 ... Engagement piece, 34 ... Coil, 3
6... Core, 38... Electromagnet, 40... Mounting pin, 42, 44... Electromagnet cover, 46, 48...
...Friction material plate, 50... Current collector brush, 52...
...Retainer, 54...Slip ring, 60...
Control device, 62...Accelerator opening sensor, 64...
...Rotational speed sensor, 66...Drive circuit, 68...Shift position sensor.

Claims (1)

[Scope of utility model registration request] In a clutch rotational fluctuation damping device in which a hub of a clutch disk and a disk plate are connected to each other by an elastic member so as to be displaceable in the rotational direction by a predetermined amount, the disk plate and the disk plate are substantially integrally connected. a thrust plate made of a magnetic material that is engaged to prevent rotation from at least one of the sub-plates, an electromagnet that is attached to the hub and magnetically attracts the thrust plate toward the hub; A rotational fluctuation damping device for a clutch having a friction material plate sandwiched therebetween.