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.:
Date of Patent:
Feb. 14, 2012
Filed:
Dec. 26, 2007
Applicants:
Hideyuki Seiyama, Oyama, JP;
Tadashi Iijima, Yuki, JP;
Shuuji Hori, Oyama, JP;
Daisuke Kozuka, Oyama, JP;
Taisei Okubo, Tsukuba, JP;
Inventors:
Hideyuki Seiyama, Oyama, JP;
Tadashi Iijima, Yuki, JP;
Shuuji Hori, Oyama, JP;
Daisuke Kozuka, Oyama, JP;
Taisei Okubo, Tsukuba, JP;
Assignee:
Komatsu Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02M 25/07 (2006.01); F02B 47/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
An EGR valve device includes a valve housing of which inside exhaust gas passes through, a poppet valve as a valve body accommodated in the valve housing, and a hydraulic servo actuator for driving the poppet valve to be opened and closed. The hydraulic servo actuator is provided by a three-port or four-port servo valve.