Transaxle having dual brake system

摘要

A hydraulic drive unit for use in a vehicle or other application incorporates a motor connected to a pump through a porting system and an output shaft driven by the motor. A mechanical brake is used to brake the motor, while a valve provides a hydraulic brake for preventing flow between the hydraulic motor and the hydraulic pump. A brake actuator is connected to both the mechanical brake and the hydraulic brake, whereby actuation of the brake actuator causes both the mechanical brake and the hydraulic brake to be actuated.

主权项

1. A hydraulic drive unit, comprising:
a hydraulic pump connected to a hydraulic motor through a porting system; a valve in fluid communication with the porting system, the valve having a first position where the valve permits fluid communication between the hydraulic pump and the hydraulic motor and a second position where the valve prevents fluid communication between the hydraulic pump and the hydraulic motor to provide hydraulic braking to the hydraulic motor; an output axle driven by the hydraulic motor; a mechanical brake operably engaged to a portion of the output axle; a brake actuator disposed adjacent to the mechanical brake and movable between an engaged position where it actuates the mechanical brake and a disengaged position where the mechanical brake is not actuated; a mechanical brake engagement mechanism operably engaged to the brake actuator; and a brake arm operably engaged to both the valve and the mechanical brake engagement mechanism to move the valve between the first position and the second position and also cause the brake actuator to move between the engaged position and the disengaged position.