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 10745887 B1

PDFFull Text
Date of Patent:
Aug. 18, 2020

Filed:

Aug. 29, 2016

Work machine

Applicant:

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

Inventors:

Yuki Akiyama, Hitachinaka, JP;

Kenji Hiraku, Kasumigaura, JP;

Hiromasa Takahashi, Abiko, JP;

Assignee:

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

Attorney:

Mattingly & Malur, PC

Primary Examiner:

Clayton E LaBalle

Assistant Examiner:

Kevin C Butler

Int. Cl.
CPC ...
E02F 9/22 (2006.01); F04B 51/00 (2006.01); F04B 49/10 (2006.01); E02F 9/26 (2006.01); F04B 49/06 (2006.01); F04B 49/08 (2006.01); G01M 3/28 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2235 (2013.01); E02F 9/226 (2013.01); E02F 9/2289 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); E02F 9/267 (2013.01); E02F 9/268 (2013.01); F04B 49/06 (2013.01); F04B 49/08 (2013.01); F04B 49/10 (2013.01); F04B 49/103 (2013.01); F04B 51/00 (2013.01); G01M 3/2853 (2013.01); G01M 3/2861 (2013.01); G01M 3/2869 (2013.01); G01M 3/2876 (2013.01);
Abstract

A work machine that can detect abnormality such as a malfunction and wear and tear of each of hydraulic pumps including control equipment with high precision and that can reduce equipment cost is provided. A controlleraccording to the present invention includes a volumetric-transfer-efficiency-calculating sectionthat calculates a volumetric transfer efficiency ηrepresenting a transfer efficiency of hydraulic oil between a hydraulic cylinderand hydraulic pumpstoon the basis of a target discharge flow rate calculated by a target-discharge-flow-rate-calculating sectionand the speed of the hydraulic cylinderthat is detected by a speed sensor, and an abnormality decision sectionthat decides whether any one of the hydraulic pumpstois abnormal on the basis of the volumetric transfer efficiency ηcalculated by the volumetric-transfer-efficiency-calculating section

Find Patent Forward Citations

Loading…