| 摘要 |
A hydraulic brake system ( 50 ) for a vehicle such as a golf car or the like uses the same brakes ( 52 ) and same brake pedal ( 80 ) for both service braking and park and hold braking. The brakes ( 52 ) are selectively engaged, locked in their engaged position, and released using an integrated control assembly including a brake pedal ( 80 ), an accelerator pedal ( 82 ), and a brake pedal locking mechanism ( 84 ). The brake pedal locking mechanism ( 84 ) is configured to automatically latch the brake pedal ( 80 ) in a locked position thereof and to automatically unlatch the brake pedal ( 80 ) from its locked position upon either subsequent movement of the brake pedal ( 80 ) into an overtravel position or subsequent actuation of the accelerator pedal ( 82 ). In addition, a hydraulic accumulator ( 62 ) stores part of the energy generated upon brake pedal depression and consequent manual actuation of a master cylinder ( 60 ) of the system to maintain the brakes ( 52 ) in their fully engaged state when the brake pedal ( 80 ) is latched. The stored energy can also be used to help return an applied brake pedal ( 80 ) to its released position, in which case return fluid flow to the master cylinder ( 60 ) is damped to avoid undesirable severe kickback of the brake pedal. The accumulator ( 62 ) preferably comprises a modular spring and retainer assembly that can be preassembled separately from the remainder of the system and subsequently mounted on the system as a unit.
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