Komatsu Corporation

Toshio Uchimura

Masanori Ikari

Nobuo Matsuyama

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 ( ) and second hydraulic motor ( ), a first input shaft ( ) and a second input shaft connected respectively ( ). The hydraulic drive apparatus transmits a torque from the first and the second hydraulic motor to an output shaft ( ). A planetary gear ( ) is interposed between the second hydraulic motor and the second input shaft, and a clutch ( ) freely engaging the second hydraulic motor with the second input shaft is provided between a ring gear ( ) of the planetary gear and a housing ( ). A modulation damper ( ) for reducing a clutch pressure (P ) before the engagement and reducing at a time of engagement is provided.

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Sayama, Japan

Toshio Uchimura