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:
Mar. 11, 2003
Filed:
Oct. 03, 2001
Yasushi Inoue, Hiroshima, JP;
Takashi Mitsuhara, Hiroshima, JP;
Takashi Ohtsuru, Hiroshima, JP;
Masako Shinohara, Hiroshima, JP;
Arata Matsue, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
A cylinder block for a multi-cylinder engine is provided with a water jacket partly on an intake side of a row of cylinders and partly on an exhaust side of the row of cylinders and a water guide passage through which cooling water is introduced into the water jacket. The cylinder block is provided with oil return passages each of which extends straight from top to bottom of the cylinder block between each adjacent cylinders. A branch oil return passage branches off from a middle portion of the rearmost oil return passage and extends rearward up. A generally triangular director pillar having a bolt hole, that is defined by first to third side walls, is disposed with the first side wall adjacent to a foremost cylinder placed approximately perpendicularly to a line passing center axes of the foremost cylinder and the bolt hole, an edge line facing the first wall placed in an interface between the water jacket and the water guide passage and the second and third side walls placed so as to direct a cooling water stream partly to the water jacket on the intake side and partly to the water jacket on the exhaust side, respectively.