JPH0143547Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clutch device that is installed in a power transmission device of a vehicle such as an automobile and connects driving force.

As is well known in the art, in a clutch device for a vehicle, a torsion spring is installed between a hub connected to a driven shaft and a clutch plate that is frictionally engaged with the drive side and rotated. Devices in which torque is transmitted via the spring are widely used. In this type of device, the torsion spring may be operated in a single stage, two stages, or three stages sequentially, and a friction washer or friction plate made of a friction material such as asbestos is further interposed. Therefore, it is common practice to provide torsional torque characteristics with hysteresis, thereby reducing noise in the transmission system.

However, in a device having the above structure, a washer for providing hysteresis in the torsional torque characteristics of the clutch is provided between the clutch plate and the hub plate, and in a device having a multi-stage torsion spring, the clutch plate and the hub plate are Friction washers or plates are interposed in the axial direction between the sub-plates, etc., which are interposed between the two, and are pressed in the axial direction by disc springs, etc., to generate a frictional force that produces the desired hysteresis. Therefore, as the number of torsion spring stages increases, the axial dimension becomes larger, the structure becomes more complex, and quality control becomes more difficult. Regardless of the barrel, the torsion torque characteristic curve essentially always takes the form of a parallelogram within the range of torsion angles that each stage of torsion spring is responsible for, and within that range, the hysteresis changes with respect to changes in the torsion angle. That was practically impossible.

The present invention has been devised to improve the drawbacks of the above-mentioned known devices, and includes a hub plate that extends radially outward from a hub connected to a driven shaft and is frictionally engaged with the drive side. and a torsion spring interposed between the hub plate and the clutch plate, wherein the hub plate is provided with a cylindrical portion concentric with the hub, and the inner periphery A friction surface having an appropriate shape is formed on the surface, and a support pin is provided on the clutch plate, passing through a portion of the hub plate radially inward from the friction surface with play and extending in the hub axial direction. The clutch device is characterized in that a shoe, the free end of which is elastically pressed against the friction surface, is pivotally attached to the support pin. In a preferred embodiment of the present invention, by applying a lining having a desired shape and material to the approximately cylindrical friction surface, the torsion angle changes regardless of the number of stages of the torsion spring. In other words, it is possible to easily generate a frictional force that
It is possible to obtain characteristics with desired hysteresis in torsional torque characteristics that deviate from conventional parallelogram characteristics, and depending on the number of stages, members for generating friction force such as friction washers, disc springs, and wave springs can be used in the axial direction. There is no need for additional installations, the structure is simple, quality control is easy, and the clutch device of the same model can have various different characteristics simply by changing the lining.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the figure, reference numeral 10 denotes a clutch plate having a substantially disc shape, and on its outer periphery is a friction facing that is frictionally engaged with a driving side member such as a flywheel of an engine to transmit driving torque. 12 is fixed. 14
18 is a retaining plate which is arranged approximately parallel to the clutch plate 10 and is integrally fixed to the clutch plate by a plurality of stop pins 16. A cylindrical hub spline-coupled to the input shaft; 20 a hub plate protruding radially outward from the hub 18; 22 disposed on the hub plate 20 at appropriate intervals in the circumferential direction; a plurality of spring holding holes 24, a torsion spring held in the holding hole 22 via a spring seat 26, and 28, corresponding to the spring holding holes 22, on the clutch plate 10 and the retaining plate 14; A torsion spring retaining window is opened in the spring seat 26, and its radial side edge engages with the bottom surface of the spring seat 26. A clearance in the circumferential direction is provided between the stop pin 16 and the outer peripheral portion of the hub plate 20, and a gap is provided between the hub plate 20 and the stop pin, that is, the clutch plate 10 and the retaining plate 14 that are integral with the stop pin 16. , the relative rotational displacement around the hub axis is caused by the torsion spring 24.
is configured to be allowed through.

On the other hand, the hub 18 is mounted on the hub plate 20.
A short cylindrical portion 30 concentric with is formed, and the inner peripheral surface of the cylindrical portion constitutes a friction surface 32. In the illustrated preferred embodiment, a liner 34 made of a friction material and previously formed into a desired shape is fixed to the inner circumferential surface of the cylindrical portion 30 to constitute the friction surface 32. but,
A friction surface having a desired shape may be integrally formed on the inner circumference of the cylindrical portion 30. Further, a support pin 36 whose both ends are fixed to the clutch plate 10 and the retaining plate 14 is provided close to the inner circumferential surface of the cylindrical portion 30, and the support pin 36 is connected to the cocoon-shaped groove 38 on the hub plate 20 with no play. It exists and penetrates. One end of each of a pair of arcuate shoes 40 is pivotally mounted on the support pin 36, and a spring 4 is attached to the other end of each shoe 40.
2 are connected to press each shoe radially outward, that is, against the friction surface 32. In the illustrated device, the spring 42 is shown as a coil spring, but may of course also be a leaf spring. Furthermore,
The free end of the shoe 40 may be made of a friction material and the friction surface 32 may be made of a conventional material. Furthermore, the support pin 36 may be an existing stud pin, or may be provided as a new component.

In the above clutch device, the rotational force of the engine (not shown) is transmitted to the clutch plate 10 and the retaining plate 14 via the flywheel and the friction facing 12, and is further transmitted to the torsion spring 24, the shoe 40, and the friction surface 32.
(including the liner 34), the signal is transmitted from the hub plate 20 and the hub 18 to a driven shaft (not shown), such as an input shaft of a transmission. At this time, engine torque fluctuations, crankshaft vibrations, etc. are effectively absorbed and damped by the shoe 40, the frictional engagement of the friction surface 32, and the torsion spring 24. At this time, in a clutch device using a conventional friction washer, the characteristic diagram shown in Figure 3 [where the horizontal axis is the torsion angle θ (deg) and the vertical axis is the torque T (Kg・m)] ], only a parallelogram-shaped torsion torque as shown by the dotted line can be obtained. However, according to the present invention, the shape and structure of the friction surface 32 (liner 3
4)), the third
It is possible to obtain desired characteristics with a wide variety as shown by the solid line in the figure. Therefore, it is possible to effectively reduce the vibration and noise of the transmission system by utilizing the torsional torque characteristics that are finely adapted to the individual configuration of the transmission system including the clutch device. Furthermore, although this embodiment shows the case where the torsion spring has a single stage, even if the torsion spring has two or three stages, the structure will not be particularly complicated as far as the hysteresis generating device is concerned, and the number of stages will not be increased as in the conventional case. If it increases, there is no need to increase the number of friction washers or friction force generating springs. Therefore, it is possible to realize a compact device without significantly increasing the axial dimension.

However, the above-mentioned shoe 40 and friction surface 3
In addition to the frictional force generating structure consisting of 2, it is of course possible and optional to use a conventional hysteresis generating device consisting of a friction washer and/or a friction plate and a disc spring.

As mentioned above, the clutch device according to the present invention has the following features:
A hub plate extending radially outward from a hub connected to a driven shaft, a clutch plate frictionally engaged with the drive side for rotation, and interposed between the hub plate and the clutch plate. In the clutch plate, the hub plate is provided with a cylindrical portion concentric with the hub, and an appropriately shaped friction surface is formed on the inner circumferential surface of the cylindrical portion, and the clutch plate is provided with a cylindrical portion concentric with the hub. A support pin is provided that passes through the hub plate portion radially inward from the surface with play and extends in the hub axis direction, and the free end of the support pin is elastically pressed against the friction surface. The present invention is characterized by a pivotably mounted shoe, and is extremely useful because it can provide an inexpensive device with a simple structure and a wide range of torsional torque characteristics.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a part of the clutch device of the present invention in cross section, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a characteristic diagram showing an example of the clutch device of the present invention. . 10...Clutch plate, 18...Hub, 2
0...Hub plate, 24...Torsion spring, 30...Cylindrical portion, 32...Friction surface, 34...
...Liner, 36...Support pin, 40...Show, 42...Spring.

Claims (1)

[Scope of utility model registration request] A hub plate extending radially outward from a hub connected to a driven shaft, a clutch plate frictionally engaged with the drive side for rotation, and interposed between the hub plate and the clutch plate. In the clutch plate, the hub plate is provided with a cylindrical portion concentric with the hub, and an appropriately shaped friction surface is formed on the inner circumferential surface of the cylindrical portion, and the clutch plate is provided with a cylindrical portion concentric with the hub. A support pin is provided that passes through the hub plate portion radially inward from the surface with play and extends in the hub axis direction, and the free end of the support pin is elastically pressed against the friction surface. A clutch device characterized in that a clutch is pivotally connected to a shoe.