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:
Jul. 12, 2011
Filed:
Dec. 22, 2006
Takatoshi Ooki, Kasumigaura, JP;
Atsushi Tanaka, Tsuchiura, JP;
Yutaka Watanabe, Kasumigaura, JP;
Masami Ochiai, Atsugi, JP;
Takatoshi Ooki, Kasumigaura, JP;
Atsushi Tanaka, Tsuchiura, JP;
Yutaka Watanabe, Kasumigaura, JP;
Masami Ochiai, Atsugi, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A swing drive system for a construction machine enhances safety for an operator. A swing control meansA has a lever input amount-torque tableand an actual rotating speed-torque table. Based on a lever input amount and an actual rotating speed of an electric motor, the tables are used to derive torque values. A minimum value of the torque values is taken as the acceleration torque. The swing control meansA further has a lever input amount-meter-out restriction area tableand an actual rotating speed-relief torque table. Based on the lever input amount and the actual rotating speed of the electric motor, a meter-out restriction area is derived from the lever input amount-meter-out restriction area table and the actual rotating speed to calculate a meter-out torque. A minimum value of the meter-out torque and relief torque is taken as the braking torque.