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:
Aug. 13, 2013
Filed:
May. 23, 2008
Toshiyuki Sakai, Osaka, JP;
Shigetoshi Shimoo, Osaka, JP;
Toshiyuki Sakai, Osaka, JP;
Shigetoshi Shimoo, Osaka, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A hydraulic excavator includes a rotation motor () for rotating an upper rotating structure. The rotation motor () includes an electric motor (), a hydraulic motor (), and a reduction gearbox (). The hydraulic motor () includes a motor mechanism () and a clutch mechanism (). The motor mechanism (), which is a vane-type hydraulic motor, is engaged with/disengaged from a motor shaft () by the clutch mechanism (). When rotation speed of the upper rotating structure is low, and a required value of output torque of the rotation motor () is high, an operation of driving the output shaft () by the hydraulic motor () is performed in the rotation motor ().