192 clutches and power-stop control – Elements – Wear compensators
Patent
1988-12-06
1990-05-15
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Wear compensators
F16D 1375
Patent
active
049249916
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a clutch cover assembly having a diaphragm spring.
BACKGROUND ART
A clutch cover assembly having long life and a diaphragm spring is required for taxis, business car and the like.
As an example of long-life, it is known that the life of a clutch is increased by fastening the facing to the clutch disc without rivets.
A conventional clutch cover assembly is shown in FIG. 5. A wear-in of the facing, in the facing used part D is established by a load characteristic as shown in FIG. 6. Since the wear-in D has a limit, an incline of the diaphragm spring, at clutch engagement, increases according to the increase of wear. Thus, the characteristic load is transformed and it is not possible to use the facing to the maximum quantity of wear. Especially in a twin type clutch, it is more difficult than in a single type clutch to get a long-life because the twin type clutch require double clearances compared to the single type clutch.
An object of this invention is to maintain initial set load even at the time of wear of the facings, and get a long-lived clutch without transforming pressure load.
DISCLOSURE OF THE INVENTION
In order to accomplish the above object, the clutch cover assembly accordance to the invention comprises;
a pressure plate divided into a plate body contactable against a facing of a clutch disc and first and second fulcrum rings, the fulcrum rings being movable in the axial direction with the first fulcrum ring disposed at the inner side of the second fulcrum ring.
Two fulcrum points are formed on the first and second fulcrum rings with little space therebetween in the radial direction.
Stopper steps are formed on the fulcrum rings so that the fulcrum point of the second fulcrum ring does move beyond the fulcrum point of the first fulcrum ring in the direction of the diaphragm spring side.
Inclined faces with incline outwardly of the clutch toward the pressure plate body are formed on the face of the fulcrum rings.
A first and second slide keys, slidable in the radial direction, are disposed between the fulcrum rings and the pressure plate body.
A first spring forces the inner first key outwardly.
A second spring, weaker than the first spring, is disposed between the slide keys.
The fulcrum points become high or spaced at longer distance from the pressure plate by wedge action of the first and the second slide keys and the first and second springs. Consequently, pressure plate is adjusted to the wearing facings and the life of the clutch is lengthened.
Because the fulcrum points are automatically adjusted as the facings wear, a set load is maintained on the facings throughout the use of the clutch.
Namely, the facing load is set at a load peak when the clutch is constructed, and is maintained at the same value throughout the life of the clutch. Consequently, the torque transmission capacity of the clutch is not reduced by wear.
Moreover, because the fulcrum points become higher as the clutch wears, the inclination of the diaphragm spring at clutch engagement is not changed. Consequently, the release operation remains constant.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical sectional view of a clutch cover assembly of the present invention with an initial set load,
FIG. 2 is a vertical sectional view of the clutch cover assembly of FIG. 1 with the facing worn but before adjusting,
FIG. 3 is a vertical sectional view of the clutch cover assembly of FIG. 2 with the clutch released,
FIG. 4 is a vertical sectional view of the clutch cover assembly of FIG. 3 with the clutch re-engaged after adjusting,
FIG. 5 is a vertical sectional view of a conventional clutch assembly, and
FIG. 6 is a graph showing the characteristic of the load.
BEST MODE FOR PRACTICING OUT THE INVENTION
FIG. 1 is a diaphragm spring type of a clutch cover assembly in accordance with this invention. Clutch cover 2 is fixed, at the input-side, to flywheel 1. Facings 6 of a clutch disc 3, a pressure-plate (pressure plate structure) 7 and a diaphragm spring 8 are arranged in or
REFERENCES:
patent: 3478843 (1964-11-01), Kraeplin
patent: 4226307 (1980-10-01), Dorot
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
Whitelaw Nicholas
LandOfFree
Clutch cover assembly with self-adjusting pressure plate 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 with self-adjusting pressure plate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clutch cover assembly with self-adjusting pressure plate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-616207