192 clutches and power-stop control – Elements – Wear compensators
Patent
1991-08-27
1993-02-16
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Wear compensators
F16D 1375
Patent
active
051862980
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a clutch cover assembly equipped with a diaphragm spring.
BACKGROUND ART
In the conventional clutch cover assembly, a pressure plate 7 is connected to a clutch cover 2 by a strap plate 21 and a diaphragm spring 8 is contacted with a fulcrum boss 7a formed integrally with the pressure plate 7, as illustrated in FIG. 5.
In this structure, it is required to ensure a wear-in allowance D by a load characteristic as diagrammed in FIG. 6. However, there is a limitation on a range of the wear-in allowance D so that, when a wear amount of a facing 6 increases, the diaphragm spring 8 is inclined to such an extent that an outer peripheral end portion of the diaphragm spring is near to the pressure plate 7 side when the clutch is engaged. The load characteristic is thereby decreased so that the facing can not be utilized fully to its maximum wear amount.
In order to increase the wear-in allowance and prolong service life of the facing, the applicant of this invention has proposed, in Published Patent Application (KOKAI) No. 63-270925 for example, a clutch cover assembly capable of automatically increasing height of a fulcrum point portion with an increase in a wear of the facing. In this structure, a fulcrum point portion, contacting with a diaphragm spring, is divided into two inside and outside fulcrum rings so that the fulcrum rings are pushed up to the diaphragm spring side, with an increase in wear of the facing, by means of actions of a slide key and spring.
However, because the slide key is fitted in the pressure plate, so as to be movable in a radial direction, the fulcrum rings are sometimes pushed up excessively y centrifugal force caused by rotation of the clutch, so that it is difficult to adjust weights of the fulcrum rings and the slide key.
OBJECT OF THE INVENTION
An object of the invention is to provide a prolonged service life of clutch and to increase height of fulcrum point portion precisely without being affected by centrifugal force, by making it possible to automatically maintain an initial setting load correspondingly to a wear amount of a facing.
DISCLOSURE OF THE INVENTION
In order to accomplish the above-mentioned object, this invention provides a clutch cover assembly, in which inside and outside fulcrum rings are fitted in an annular concave portion of a pressure plate in such a manner as to be movable in an axial direction. Inside and outside fulcrum point portions, contacting with a diaphragm spring, are formed on the both fulcrum rings with a space left between them in a radial direction. Stepped portions are formed, respectively, in order to restrict the outside fulcrum point portion from moving to the diaphragm spring side beyond the inside fulcrum point portion. Inside and outside pressing springs are compressively installed between the fulcrum rings and bottom faces of the concave portions, respectively, through annual ar spring receiving plates, the fulcrum rings being thereby pressed to the diaphragm spring side. Axially movable annular lock wires are installed between the fulcrum rings and wall surfaces of the concave portions, respectively. Lock springs, having spring forces weaker than those of the pressing springs, are compressively installed between the lock wires and the spring receiving plates, respectively, to press the lock wires on tapered faces of the fulcrum springs, so that axial return motions of the fulcrum rings are thereby locked.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical sectional partial view showing an initial setting state of a clutch cover assembly to which this invention is applied.
FIG. 2 is a vertical sectional partial view showing a clutch engaged state at time of wear-in.
FIG. 3 is a vertical sectional partial view showing a clutch released state at time of wear-in.
FIG. 4 is a vertical sectional partial view showing another embodiment.
FIG. 5 is a vertical sectional view of a conventional embodiment.
FIG. 6 is a load characteristic diagram.
BEST MODE FOR CARRYING OUT THE INVENTION
As
REFERENCES:
patent: 2678120 (1954-05-01), Binder
patent: 2703164 (1955-03-01), Binder
patent: 4924991 (1990-05-01), Takeuchi
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
LandOfFree
Clutch cover assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Clutch cover assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clutch cover assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2142568