초록 ▼

A hydraulic drive assembly includes a variable displacement pump fluidly connected in a closed loop circuit with a motor for driving an ancillary device, such as a fan. An auxiliary pump can be operatively connected to the pump, the motor and a reservoir for replenishing fluid losses in the closed l

A hydraulic drive assembly includes a variable displacement pump fluidly connected in a closed loop circuit with a motor for driving an ancillary device, such as a fan. An auxiliary pump can be operatively connected to the pump, the motor and a reservoir for replenishing fluid losses in the closed loop circuit. An auxiliary circuit connected to the pump has a recirculating passage fluidly connected to the closed loop circuit downstream of the motor to reduce the necessary reservoir volume. A method for smoothly and continuously adjusting the output of the pump to drive the ancillary device is also disclosed.

대표청구항 ▼

[ What is claimed is:] [1.] A hydraulic drive assembly comprising:an electronically controlled variable displacement pump;a hydraulic motor fluidly connected in a closed loop circuit with the pump for receiving an output flow therefrom and thereby driving an ancillary device;a fluid reservoir;an aux

[ What is claimed is:] [1.] A hydraulic drive assembly comprising:an electronically controlled variable displacement pump;a hydraulic motor fluidly connected in a closed loop circuit with the pump for receiving an output flow therefrom and thereby driving an ancillary device;a fluid reservoir;an auxiliary pump operatively connected to the reservoir, for drawing fluid from the reservoir and supplying the fluid to the closed loop circuit for replenishing fluid losses therein;an auxiliary hydraulic circuit fluidly connected to the auxiliary pump and having a recirculating conduit fluidly connected to the closed loop circuit downstream of the motor.