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:
Jul. 25, 2006
Filed:
May. 22, 2003
Applicant:
Yoji Yamashita, Tokyo, JP;
Inventor:
Yoji Yamashita, Tokyo, JP;
Assignees:
Hino Motors, Ltd., Tokyo, JP;
Sankyo Radiator Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F02M 25/10 (2006.01); F02M 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An EGR cooler has tubes and a shell for enclosing the tubes. Cooling water is supplied into and discharged from the shell and exhaust gas from a diesel engine is guided into each of the tubes so as to conduct heat exchange of the exhaust gas with the cooling water. An inner periphery of each of the tubes is formed with spiral protrusions each having an inclination angle in a range of 26°–50° to a plane perpendicular to an axis of the tube.