Actuator with wear compensating chamber

Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – With means for selectively changing the speed or force...

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Details

91508, 91534, 91535, 192111A, F15B 1100, F15B 1300

Patent

active

052358984

ABSTRACT:
An actuator for a friction clutch having a diaphragm includes coupling means comprising a first part associated with the clutch actuating linkage, and a second part associated with the actuator proper. The actuator, of the fluid operated type, comprises a main piston working in a main cylinder and defining with it a control chamber. A secondary piston works within the hollow bore of the main piston to define within the latter a wear compensating chamber. The main piston carries a shut-off valve for bringing the control chamber and the wear compensation chamber into communication with each other when the clutch is in its engaged position. The actuator also includes a booster spring for applying additional force to the diaphragm, such that the characteristic of the diaphragm has a positive gradient over the whole travel between the engaged and disengaged positions of the clutch. The booster spring is brought into operation by a loose coupled driving means between the booster spring and the sub-assembly of the two pistons.

REFERENCES:
patent: 2282556 (1942-05-01), Bowen
patent: 4671400 (1987-06-01), Grunberg et al.

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