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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 10519990 B1

PDFFull Text
Date of Patent:
Dec. 31, 2019

Filed:

Mar. 26, 2015

Hydraulic apparatus

Applicant:

Yanmar Co., Ltd., Osaka-shi, Osaka, JP;

Inventors:

Kazuhiro Owada, Amagasaki, JP;

Keishi Yamanaka, Osaka, JP;

Kensuke Kaneda, Osaka, JP;

Hidekazu Niu, Osaka, JP;

Assignee:

YANMAR CO., LTD., Osaka, unknown;

Attorney:

Norton Rose Fulbright US LLP

Primary Examiner:

Abiy Teka

Int. Cl.
CPC ...
F15B 21/14 (2006.01); E02F 9/22 (2006.01); F15B 11/04 (2006.01); F15B 11/17 (2006.01); E02F 9/20 (2006.01); F04B 1/20 (2006.01); F04B 49/00 (2006.01); F15B 7/00 (2006.01); E02F 3/32 (2006.01); E02F 3/40 (2006.01); E02F 9/08 (2006.01); F04C 2/18 (2006.01); F04C 2/344 (2006.01);
U.S. Cl.
CPC ...
F15B 21/14 (2013.01); E02F 9/2075 (2013.01); E02F 9/2217 (2013.01); E02F 9/2232 (2013.01); E02F 9/2235 (2013.01); E02F 9/2271 (2013.01); E02F 9/2289 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F04B 1/20 (2013.01); F04B 1/2042 (2013.01); F04B 49/002 (2013.01); F15B 7/006 (2013.01); F15B 11/04 (2013.01); F15B 11/17 (2013.01); E02F 3/325 (2013.01); E02F 3/401 (2013.01); E02F 9/0883 (2013.01); E02F 9/2004 (2013.01); E02F 9/2267 (2013.01); E02F 9/2275 (2013.01); F04C 2/18 (2013.01); F04C 2/3442 (2013.01); F15B 2211/20515 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/20538 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/20561 (2013.01); F15B 2211/20569 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/2656 (2013.01); F15B 2211/27 (2013.01); F15B 2211/633 (2013.01); F15B 2211/6346 (2013.01); F15B 2211/6651 (2013.01); F15B 2211/6652 (2013.01); F15B 2211/7053 (2013.01); F15B 2211/71 (2013.01); F15B 2211/7142 (2013.01); F15B 2211/75 (2013.01); F15B 2211/77 (2013.01); F15B 2211/88 (2013.01);
Abstract

The hydraulic apparatus is set so that the ratio of the pressure-receiving area of the respective bottom oil chambers of the boom cylinder, the arm cylinder and the bucket cylinder to the pressure-receiving area of the respective rod oil chambers matches the ratio of the extruded volume drawn into or discharged from the bottom oil chambers per single rotation by the respective extrusion members of the first hydraulic pump motor, the second hydraulic pump motor and the third hydraulic pump motor to the volume discharged from or drawn into the rod oil chambers.

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