| 摘要 |
<p>A neutral brake system for use in a hydrostatic transmission to automatical ly apply a brake when the hydrostatic transmission is shifted to neutral. The neutral brake system includes a hydraulically-released, spring-activated brake mechanism i n direct fluid communication with the main hydraulic passages which form a hydraulic circuit between the pump and the motor. When the hydrostatic transmission is shifted to neutral, a brake spring biases a brake lever into contact with a pair of friction pads to engage a brake disk splined to the output shaft of the: motor to stop the vehicle. When the hydrostatic transmission is shifted out of neutral, a charge of hydrauli c pressure within the hydraulic circuit causes a piston within a brake release chamber to override the biasing force of the brake spring, and to urge the brake lever out of contact with the friction pads such that the friction pads are disengaged from the brake disk , and the output shaft of the output shaft of the motor may freely rotate. A throttlin g orifice is provided in the hydraulic circuit to restrict hydraulic flow from the brake release chamber to prevent abrupt engaging of the brake mechanism when the transmission is shifted to neutral.</p> |
