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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 9850885 B1

PDFFull Text
Date of Patent:
Dec. 26, 2017

Filed:

Dec. 12, 2012

Engine overload prevention using a speed differential operated relief valve

Applicant:

Yanmar Co., Ltd., Osaka, JP;

Inventor:

Kunihiko Sakamoto, Fukuoka, JP;

Assignee:

YANMAR CO., LTD., Osaka, JP;

Attorney:

Cantor Colburn LLP

Primary Examiner:

Bryan Lettman

Assistant Examiner:

Timothy Solak

Int. Cl.
CPC ...
F04B 1/32 (2006.01); F04B 17/05 (2006.01); F04B 49/08 (2006.01); F04B 49/06 (2006.01); F15B 20/00 (2006.01); F15B 11/042 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01); F04B 49/20 (2006.01); F04B 1/29 (2006.01);
U.S. Cl.
CPC ...
F04B 1/324 (2013.01); E02F 9/2079 (2013.01); E02F 9/226 (2013.01); E02F 9/2235 (2013.01); E02F 9/2246 (2013.01); E02F 9/2282 (2013.01); E02F 9/2285 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F04B 1/29 (2013.01); F04B 1/32 (2013.01); F04B 17/05 (2013.01); F04B 49/065 (2013.01); F04B 49/08 (2013.01); F04B 49/20 (2013.01); F15B 11/0423 (2013.01); F04B 2203/0209 (2013.01); F15B 20/007 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/20538 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/30595 (2013.01); F15B 2211/50518 (2013.01); F15B 2211/50536 (2013.01); F15B 2211/5157 (2013.01); F15B 2211/526 (2013.01); F15B 2211/55 (2013.01); F15B 2211/633 (2013.01); F15B 2211/6346 (2013.01); F15B 2211/6652 (2013.01); F15B 2211/86 (2013.01);
Abstract

A working vehicle provided with a fixed-capacity hydraulic pump driven by power from an engine and a working hydraulic actuator driven by working oil pumped from the fixed-capacity hydraulic pump is a rotary working vehicle which is provided with an electromagnetic relief valve for modifying the pressure of working oil from the fixed-capacity hydraulic pump, and the rotary working vehicle is such that if the actual number of revolutions (N) of the engine is reduced by a set number of revolutions (Ns) as the load on the engine increases, then the electromagnetic relief valve operates in accordance with the deviation (e) between the actual number of revolutions (N) of the engine and the specified number of revolutions (Ns), and the pressure of the working oil from the fixed-capacity hydraulic pump is modified.

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