192 clutches and power-stop control – Clutches – Axially engaging
Patent
1990-03-29
1991-06-11
Herrmann, Allan D.
192 clutches and power-stop control
Clutches
Axially engaging
192 89B, F16D 1350
Patent
active
050225081
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a clutch cover assembly.
2. Background Art
Conventionally, a corrugated or stepped cushioning plate 25 compressible in axial direction has been installed between a flywheel 7 and pressure plate 11, and facings 5 have been provided on opposite sides of the cushioning plate 25 so as to accomplish a cushioning function in a driven plate for clutch disc, as illustrated in FIG. 5.
In case of utilizing such cushioning plate 25, it has not been possible to provide sufficient width to the cushioning plate 25 between flywheel 7 and pressure plate 11 to improve durability and extend service life of the facing, because of axial width or thickness of the cushioning plate 25 itself.
OBJECT OF THE INVENTION
An object of this invention is to accomplish an elongation of service life of the facing by making it possible to perform a cushioning function between a pressure plate and a diaphragm spring.
DISCLOSURE OF THE INVENTION
Technical Measure
In order to accomplish the above object in this invention, a pressure plate is connected to a clutch cover through a strap plate, a driven plate to which facings of a clutch disc are secured is made into a flat-shape, a diaphragm spring, exerting a pressing load on the pressure plate, is supported by a clutch cover and made contact with the pressure plate in such a manner as separable therefrom in axial direction, a cushioning coned disc spring is installed compressively between the diaphragm spring and the pressure plate, a load of the coned disc spring is set smaller than a diaphragm spring load at time of clutch engagement and larger than a reaction force of the strap plate, thereby the coned disc spring is adapted to exert a pressing load on the pressure plate during a prescribe cushioning movement of the diaphragm spring from when it begins to leave the pressure plate at the time of clutch releasing operation.
Function
The diaphragm spring first leaves the pressure plate at the time of clutch releasing operation. However, the pressing load is exerted on the pressure plate by an elastic force of the coned disc spring compressively installed between the pressure plate and the diaphragm spring. Thereby a so-called semi-engaged condition is maintained during a prescribed stroke.
When a clearance between the diaphragm spring and the pressure plate reaches the prescribed stroke, the pressing load exerted by the coned disc spring disappears so that the pressure plate is separated from the facing by means of the reaction force of the strap plate.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical sectional partial view of a clutch cover assembly according to the invention.
FIG. 2 is a vertical sectional view of the same part as FIG. 1 at time of releasing operation.
FIG. 3 is a vertical sectional partial view showing an embodiment applied to a clutch equipped with a clip.
FIG. 4 is a pressing load characteristic diagram.
FIG. 5 is a vertical sectional view of conventional embodiment.
BEST MODE FOR CARRYING OUT THE INVENTION
In FIG. 1, showing the vertical sectional view of the clutch according to this invention, a clutch disc 2 is spline fits onto an output shaft 1 at its inner peripheral spline hub. A flat-shaped driven plate 3 is secured to an outer peripheral end of the clutch disc 2, and facings, 5, are secured to opposite surfaces of the driven plate 3. The facings 5 are molded integrally by way of through holes on the driven plate 3 and are disposed between an engine side flywheel 7 and a pressure plate 11.
A clutch cover 10 is fastened to an end face of the flywheel 7. The pressure plate 11 is connected to the clutch cover 10 and axially movably in relation thereto by resilient strap plates 12 disposed at plural places with spaces left therebetween in circumferential direction. A tab 14 is formed on the clutch cover 10 at its end opposite to the flywheel side, and an annular intermediate fulcrum point C2 of a diaphragm spring 15 is held by a pair of wire rings 16 supported by the tab 14. An outer per
REFERENCES:
patent: 2641344 (1953-06-01), Banker
patent: 3300007 (1967-01-01), Hotsch
patent: 4095683 (1978-06-01), Ban
patent: 4602708 (1986-07-01), Nagano
patent: 4949829 (1990-08-01), Tojima et al.
Herrmann Allan D.
Kubushiki Kaisha Daikin Seisakusho
Pitts Andrea
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