Hydraulic motor driving device

摘要

A motor capacity change-over actuator 10 varies a capacity of a hydraulic motor 1 in accordance with the inflow/outflow of a working fluid into/out of a drive pressure chamber 72. A motor capacity change-over valve 20 supplies the working fluid to the drive pressure chamber 72 in a supply position H and discharges the working fluid from the drive pressure chamber 72 in a discharge position L. A flow control valve 15 is interposed between the drive pressure chamber 72 and the motor capacity change-over valve 20, and therefore a shock generated upon deceleration of the hydraulic motor 1 can be alleviated without being affected by leakage of the working fluid in the motor capacity change-over valve 20.

主权项

1. A hydraulic motor driving device that varies a capacity of a hydraulic motor using a working fluid, comprising:
a motor capacity change-over actuator, the motor capacity change-over actuator comprising a drive pressure chamber that varies the capacity of the hydraulic motor in accordance with supply and discharge of the working fluid; a motor capacity change-over valve that changes between a supply position in which the working fluid is supplied to the drive pressure chamber and a discharge position in which the working fluid is discharged from the drive pressure chamber; and a flow control valve that is disposed between the drive pressure chamber and the motor capacity change-over valve to adjust a flow rate of the working fluid discharged from the drive pressure chamber, wherein the flow control valve is constituted by a pressure responsive variable orifice that narrows a flow sectional area of the working fluid as a working fluid pressure in the drive pressure chamber increases.