JPH0435620Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure plate for a clutch installed in a power transmission device of a vehicle such as an automobile.

As is well known in the art, a clutch device for a vehicle consists of a drive side consisting of an engine flywheel, a clutch cover, and a pressure plate that rotates integrally therewith and is movable in the axial direction; and a driven side consisting of a clutch disk mounted so as to be able to slide on the input shaft of the transmission with a spline. In the case of a clutch device such as a truck having a large torque transmission capacity, the clutch cover and the pressure plate are often connected via a strap plate made of a large number of thin steel plates.
However, with this type of clutch device, chatter vibration occurs between the facing of the clutch disk and the pressure plate when the clutch is engaged or disengaged.
This is transmitted to the clutch cover via the strap plate and amplified by the clutch cover, producing an unpleasant noise called clutch squeal.

The present invention was devised for the purpose of providing a clutch device that can effectively eliminate or at least reduce the above-mentioned clutch squeal. An annular core member made of a steel plate, which is movably connected to the clutch cover, and has a mounting base for the strap plate, a mounting base for screwing the return spring mounting bolt, a mounting base for mounting the release lever, etc. fixed on the back surface facing the clutch cover. A solidified material made of different materials such as aluminum alloy, cast iron, and glass fiber-reinforced synthetic resin is formed to cover the surface facing the concentric clutch disk, the inner peripheral surface, the outer peripheral surface, and the back surface excluding the above-mentioned mounting base. A molding layer is provided, and a minute gap is formed between the annular core material and the solidification molding layer due to a difference in thermal expansion coefficient when the solidification molding layer is molded. It is something. According to the present invention, the pressure plate is formed by covering the outer side of the steel material as the core material which mainly bears the strength with a solidified formed layer of a dissimilar material such as an aluminum alloy. A slight gap is created between different materials due to the difference in coefficient of thermal expansion after solidification, and the chatter vibration is effectively attenuated and transmitted to the core material of the steel plate, and further transmitted to the clutch cover via the strap plate, etc. Therefore, clutch squeal can be effectively prevented or at least reduced.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the figure, 10 generally indicates a pressure plate having an annular shape as a whole, and 12 similarly indicates a clutch cover. The pressure plate 10 has a core member 14 made of an annular steel plate at its center, and a strap plate is arranged on the core member 14 substantially parallel to the axis 0-0 of the pressure plate. A mounting base 20 made of steel screws together the mounting bolts 18 of 16, a mounting base 26 also made of steel that screws together the mounting bolts 24 of the return spring 22, and is rotated by a release bearing (not shown) to prevent the clutch from disengaging. Release lever 2 for contacting
Steel mounts 32 to which eight pivot bolts 30 are attached are each fixed by welding. At least the outer portion of the core material 14 facing the clutch disk (not shown) is made of aluminum alloy, cast iron,
A solidified molded layer 34 of different materials such as glass fiber reinforced synthetic resin is integrally formed by casting or molding, and the end face indicated by reference numeral 36 in the figure engages with the friction surface of the clutch disk. It is a surface. In addition, 38 in the figure indicates the clutch cover 12.
A pivot shaft 40 is supported by the return spring 22 and constitutes a fulcrum of the release lever 28.
The strap plate is made of several thin steel plates and connects the pressure plate 10 and the clutch cover 12.

In the conventional clutch device having the above structure, the pressure plate 10 is usually made of cast iron. Therefore, when the clutch is engaged or disengaged, so-called chatter vibration occurs when the frictional engagement surface starts contacting with the corresponding frictional surface of the clutch disk and when it separates therefrom, and this vibration is transmitted from the pressure plate 10 to The signal is transmitted to the clutch cover 12 via the strap plate 16 and amplified by the clutch cover, which is generally shaped like a loudspeaker, producing a so-called clutch squeal. However, according to the structure of the present invention, the core material 14 and the mounting bases 20, 26, and 32, which are necessary to maintain the strength of the clutch plate, are made of steel plates and steel materials, and are opposed to the clutch disk of the core material 14. Since the outer part of the material is formed of a solidified layer 34 of different materials such as aluminum alloy, cast iron, and glass fiber-reinforced synthetic resin, the expansion coefficient is maintained between the steel material and the above-mentioned different materials after the casting or molding work is completed. A fine gap is created by the difference in the clutch cover 12, and this gap effectively damps the chatter vibration, so that the vibration energy transmitted to the clutch cover 12 is reduced, and the clutch squeal is eliminated or at least effectively reduced. It will be done.

In the above embodiment, when glass fiber-reinforced synthetic resin is used to form the solidified molded layer 34 of different materials, heat-resistant synthetic resins such as polyimide and phenolic synthetic resins are preferred from the viewpoint of frictional heat generation. . Furthermore, when aluminum alloy or synthetic resin is used as the dissimilar material 34, the weight can be significantly reduced compared to conventional cast iron.

As mentioned above, the pressure plate of the clutch according to the present invention is movably connected to the clutch cover via the strap plate, and has a mounting base for the strap plate and a return spring mounting bolt on the back surface facing the clutch cover. The annular core material made of a steel plate to which the mounting base for screwing together and the mounting base for attaching the release lever, etc., and the surface, inner circumferential surface, and outer circumferential surface of the concentric material facing the clutch disk, excluding the above-mentioned mounting base. A solidified molded layer made of different materials such as aluminum alloy, cast iron, and glass fiber reinforced synthetic resin is formed to cover the back surface, and the same solidified molded layer is provided between the annular core material and the solidified molded layer. It is characterized by a minute gap being formed due to the difference in thermal expansion coefficients during molding, and is capable of eliminating, or at least effectively reducing, clutch squeal caused by chatter vibration when the clutch is engaged or disengaged. It is extremely useful because it can be done.

[Brief explanation of the drawing]

The accompanying drawing is a side sectional view showing one embodiment of the present invention. 10... Pressure plate, 14... Core material,
12...Clutch cover, 34...Different material layer.

Claims (1)

[Scope of utility model registration request] It is movably connected to the clutch cover via a strap plate, and a mounting base for the strap plate, a mounting base for threading the return spring mounting bolt, a mounting base for mounting the release lever, etc. are fixed to the back surface facing the clutch cover. an aluminum alloy formed by covering an annular core material made of a steel plate, a surface of the concentric material facing the clutch disk, an inner circumferential surface, an outer circumferential surface, and a back surface excluding the mounting base;
A solidified molded layer made of different materials such as cast iron and glass fiber reinforced synthetic resin is provided between the annular core material and the solidified molded layer. A clutch pressure plate is characterized by a small gap formed between the clutches.