Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Single valve for relatively movable working members
Reexamination Certificate
2007-10-02
2007-10-02
Leslie, Michael (Department: 3745)
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
Single valve for relatively movable working members
C091S527000
Reexamination Certificate
active
11213455
ABSTRACT:
The invention relates to a hydraulic control apparatus (1) for a shifting fork (7) for engaging/releasing at least one gear (G) in a manual transmission, comprising at least one shifting cylinder (2, 3) and a piston unit (6) which can move within the shifting cylinder and is connected to the shifting fork (7), and at least one control valve (8) for generating a modeled pressure which can be applied to the piston unit (6) in order to actuate the shifting fork (7). To prevent jolting when the piston unit is started up, the invention proposes a valve apparatus which provides a counter-pressure which counteracts the movement of the piston unit (6). In a preferred exemplary embodiment, a diaphragm ensures that the counter-pressure drops below the value preset by the valve apparatus at low speeds on the part of the piston unit.
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Getrag Ford Transmissions GmbH
Leslie Michael
Schlee IP International P.C.
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