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:
Sep. 07, 2021
Filed:
May. 23, 2018
Hitachi Construction Machinery Tierra Co., Ltd., Koka, JP;
Kiwamu Takahashi, Moriyama, JP;
Taihei Maehara, Koka, JP;
Takeshi Ishii, Hino-cho, JP;
Yoshifumi Takebayashi, Koka, JP;
Natsuki Nakamura, Koka, JP;
Daisuke Oka, Yasu, JP;
Abstract
When a swing motor and a boom cylinder are driven simultaneously, a hydraulic drive system appropriately adjusts a distribution of torques between hydraulic pumps and feeds back a torque actually consumed by the hydraulic pump for actuating the swing motor accurately to the hydraulic pump for actuating the boom cylinder. To that end, when boom raising and swinging are performed simultaneously, the hydraulic drive system corrects an allowable torque of a hydraulic pumpthat supplies a hydraulic fluid to a swing motorso as to be lowered by a certain ratio, reducing allowable torques of hydraulic pumpsandthat supply a hydraulic fluid to a boom cylinderby torques consumed by the hydraulic pumpsandthat supply a hydraulic fluid to the swing motor