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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 11608612 B1

PDFFull Text
Date of Patent:
Mar. 21, 2023

Filed:

Sep. 02, 2020

Hydraulic unit

Applicant:

Daikin Industries, Ltd., Osaka, JP;

Inventors:

Hirokazu Nakamura, Osaka, JP;

Atsuhiro Kanbayashi, Osaka, JP;

Hitoshi Segawa, Osaka, JP;

Assignee:

Daikin Industries, Ltd., Osaka, JP;

Attorney:

Global IP Counselors, LLP

Primary Examiner:

Michael Leslie

Int. Cl.
CPC ...
F15B 19/00 (2006.01); F15B 20/00 (2006.01); F15B 11/08 (2006.01); E02F 9/22 (2006.01); F15B 1/26 (2006.01); F15B 13/04 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2228 (2013.01); F15B 1/26 (2013.01); F15B 19/005 (2013.01); F15B 20/004 (2013.01); F15B 11/08 (2013.01); F15B 13/0401 (2013.01); F15B 2211/20515 (2013.01); F15B 2211/20538 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/30505 (2013.01); F15B 2211/40515 (2013.01); F15B 2211/411 (2013.01); F15B 2211/41509 (2013.01); F15B 2211/41563 (2013.01); F15B 2211/45 (2013.01); F15B 2211/633 (2013.01); F15B 2211/634 (2013.01); F15B 2211/6309 (2013.01); F15B 2211/6343 (2013.01); F15B 2211/7053 (2013.01); F15B 2211/855 (2013.01); F15B 2211/857 (2013.01);
Abstract

A hydraulic unit includes a hydraulic circuit fluidly connected to a hydraulic actuator, and a control device to control the hydraulic circuit. The hydraulic circuit includes a hydraulic oil tank, a hydraulic pump that supplies the hydraulic oil to the hydraulic actuator from the hydraulic oil tank, a discharge flow path fluidly connecting a discharge side of the hydraulic pump to the hydraulic actuator, a valve that blocks a flow of the hydraulic oil in the discharge flow path, and a pressure sensor that detects a pressure of the hydraulic oil the discharge flow path. In a pressure holding state, when a rotational frequency of the hydraulic pump exceeds a predetermined first determination rotational frequency or when a discharge flow rate of the hydraulic pump exceeds a predetermined first determination discharge flow rate, the control device determines that the hydraulic circuit is abnormal.

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