The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Sep. 14, 2000
Komatsu, Ltd., Tokyo, JP;
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 ( ) 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.