logo

For the Inventor, By the Inventor

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.:

US 12753569 B1

PDFFull Text
Date of Patent:
Oct. 06, 2026

Filed:

Mar. 29, 2023

Construction machine

Applicant:

Hitachi Construction Machinery Co., Ltd., Tokyo, JP;

Inventors:

Shuu Shirato, Tsuchiura, JP;

Masahiro Kayane, Tsuchiura, JP;

Kento Kumagai, Ami-machi, JP;

Mitsuhiko Kanehama, Kasumigaura, JP;

Assignee:

HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;

Attorney:

MATTINGLY & MALUR, PC

Primary Examiner:

Abiy Teka

Int. Cl.
CPC ...
E02F 3/42 (2006.01); E02F 3/32 (2006.01); E02F 3/43 (2006.01); E02F 9/22 (2006.01); E02F 9/26 (2006.01); F15B 11/17 (2006.01); F15B 13/06 (2006.01); F15B 19/00 (2006.01); E02F 9/20 (2006.01);
U.S. Cl.
CPC ...
E02F 3/435 (2013.01); E02F 3/32 (2013.01); E02F 3/425 (2013.01); E02F 9/2203 (2013.01); E02F 9/2285 (2013.01); E02F 9/2292 (2013.01); E02F 9/262 (2013.01); F15B 11/17 (2013.01); F15B 13/06 (2013.01); F15B 19/00 (2013.01); E02F 9/2004 (2013.01); E02F 9/2296 (2013.01); F15B 2211/329 (2013.01);
Abstract

There is provided a construction machine including first and second hydraulic actuators that are driven by first and second hydraulic pumps, respectively, and drive a front work implement, a third hydraulic actuator driven by the second hydraulic pump, solenoid valves that control a hydraulic fluid supplied to the second hydraulic actuator, an operation device that operates the front work implement, and a controller that controls the solenoid valves and the first and second hydraulic pumps on the basis of the distance between the front work implement and a target construction face and an operation signal. The controller computes an upper limit speed of the second hydraulic actuator on the basis of the flow rate difference between the maximum delivery rate of the second hydraulic pump and a supply flow rate supplied to the third hydraulic actuator, computes a target speed of the second hydraulic actuator while limiting, by the upper limit speed, a required speed of the second hydraulic actuator according to the operation signal, and controls the solenoid valves and the second hydraulic pump according to the target speed.

Find Patent Forward Citations

Shirato, Shuu. (2026). Construction machine (U.S. Patent No. 12753569). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12753569

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Loading…