192 clutches and power-stop control – Clutches – Operators
Patent
1987-04-23
1988-10-18
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 7013, 192 91A, 192 98, 192DIG1, F16D 1322, F16D 2314
Patent
active
047780398
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement in a friction clutch between an engine and a gearbox, wherein a clutch release bearing is premounted in a clutch part connected to the engine and an axially displaceable sleeve cooperating with the clutch release bearing is premounted in a release mechanism connected to the gearbox, said sleeve comprising a companion flange means cooperating with a blocking element to assume a position for either displacing or not displacing the clutch release bearing.
This type of arrangement is used in so-called pull clutches, which when used in the drive unit of a motor vehicle have advantages as regards function, functional life and cost of manufacture over so-called press clutches. The latter have the advantage however of simple mounting when connecting the engine and the gearbox, since the release mechanism only needs to press on the clutch release bearing.
In a pull clutch the clutch release bearing and the release mechanism must be linked together however. Since it is difficult when connecting the engine and the gearbox to get at the clutch release bearing and the release mechanism from the outside, it is desirable that the connection and disconnection be effected automatically.
It is known by German Offenlegungsschrift 3 113 463 to carry out such automatic connections. These solutions use companion flange means in the form of a ring spring which is biassed toward a position for displacing the clutch release bearing. The solutions require that when connecting or disconnecting an engine and a gearbox, a sufficiently large force is applied to force the spring into or out of the displacing position. This involves a further complication of an already relatively complicated assembly and disassembly process. Misalignment between the engine and the gearbox can be the result as well as clamping of the spring ring with increased risk of spring breakage. If the spring should break, the biassing towards the displacing position also ceases, and the clutch will be inoperative.
The purpose of the present invention is to achieve an arrangement of the type initially described which does not have the above mentioned disadvantages. Rather it provides for simple assembly and disassembly of the engine and gearbox with secure linkage between the clutch release bearing and the release mechanism as a result. For this purpose the invention is characterized in that the blocking element in a clutch-assembled position has a position relative to the sleeve in which the companion flange means is actively acted on by the blocking element to a clutch release bearing displacing position.
Through the solution according to the invention, the companion flange means is acted on directly by the blocking element to assume a displacing position, and therefore the companion flange means does not need to be biassed towards said position. This makes it also possible to link together the clutch release bearing and the release mechanism by acting on the blocking element without having to make the force applied when connecting the engine and gearbox overcome the spring force.
In an advantageous embodiment of the invention, the sleeve is located radially inside the clutch release bearing and constitutes a portion of the piston in a hydraulic cylinder. This makes the hydraulically operated clutch compact by enabling the space between the clutch portion fixed to the engine and the cylinder housing of the release mechanism to be used to axial displacement of the clutch release bearing.
In a further advantageous embodiment of the invention the companion flange means is spring-loaded towards a position for not displacing the clutch release bearing and is arranged by the action of the blocking element to be brought to the displacing position when the sleeve is imparted a release movement starting from an assembly end position. To overcome the pretension of the companion flange means, the releasing power is used which is generated when operating the release mechanism. Therefore the force for connecting the engine and th
REFERENCES:
patent: 4687084 (1987-08-01), Leigh-Monstevens et al.
patent: 4691814 (1987-09-01), Wimbush
Bonck Rodney H.
Lorence Richard M.
Saab-Scania Aktiebolag
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