Hydraulic fan drive system

摘要

A debris collection vehicle having an enclosed volume for collecting debris and a hydraulic fan drive system for creating vacuum condition in the enclosed volume is disclosed. In one embodiment, the hydraulic fan system includes a closed loop hydraulic circuit, a variable displacement hydraulic pump disposed within the closed loop circuit, and a hydraulic motor disposed within the closed loop circuit. The hydraulic fan drive system can also include an electronic or hydraulically actuated control valve constructed and arranged to adjust the output of the hydraulic motor via a displacement actuator based on pressure in the closed loop hydraulic circuit.

主权项

1. A hydraulic fan drive system comprising:
(a) a closed loop hydraulic circuit; (b) a hydraulic pump disposed within the closed loop circuit and having an inlet and an outlet; (c) a hydraulic motor disposed within the closed loop circuit, the hydraulic motor having:
i. an output shaft;ii. an inlet in direct fluid communication with the variable displacement pump outlet; andiii. an outlet in direct fluid communication with the variable displacement pump inlet; (d) a fan coupled to the output shaft of the hydraulic motor; and (e) a control valve constructed and arranged to adjust the output of the hydraulic motor based solely on pressure in the closed loop hydraulic circuit at a location defined between the hydraulic pump inlet and outlet and the hydraulic motor inlet and outlet.