| 摘要 |
A dual piston hydraulic cylinder for actuating a clutch and an upshift brake in a heavy-duty vehicle is provided which achieves consistent, selectable, sequential, and controllable operation utilizing a single control pedal. A preloaded spring located between two pistons sequences the pressure accumulation and fluid flow to actuate the clutch and the upshift brake in such a manner so as to preclude brake actuation unless the clutch is disengaged. A fluid reservoir in selective fluid communication with the hydraulic cylinder automatically adjusts the separate fluid links between the clutch and the upshift brake to compensate for changes in their corresponding engaged positions due to wear. The apparatus disclosed accommodates the use of disparately designed clutches and upshift brakes.
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