Hydraulic drive apparatus for working machine

Abstract

The invention provides a hydraulic drive apparatus which obtain a desired speed reduction ratio and a reduced shock during clutch engagement. Accordingly, the hydraulic drive apparatus for a working machine has a variable capacity type first (8) and second hydraulic motor (11), a first input shaft (5) and a second input shaft connected respectively (7). The hydraulic drive apparatus transmits a torque from the first and the second hydraulic motor to an output shaft (2). A planetary gear (21) is interposed between the second hydraulic motor and the second input shaft, and a clutch (10) freely engaging the second hydraulic motor with the second input shaft is provided between a ring gear (29) of the planetary gear and a housing (24). A modulation damper (22) for reducing a clutch pressure (P3) before the engagement and reducing at a time of engagement is provided.

Dependencies are inferred from the claim text.