Mazda Motor Corporation

Takashi Ohtsuru

Hiroyuki Oda

Tsuyoshi Goto

Kazuhiko Ueda

Kouichi Hatamura

Kazuhiko Hashimoto

Yasushi Inoue

Masako Shinohara

Shigeo Tabata

Arata Matsue

Takashi Mitsuhara

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.

Engine block structure for reciprocating engine

An air feeding system for a vehicle engine equipped with a supercharger comprises an inlet passage provided in an engine room with its first section interconnecting an air cleaner and a throttle valve, its second section interconnecting the throttle valve and the supercharger, and its third section interconnecting the supercharger and an engine body of the vehicle engine for feeding a cylinder in the engine body with intake air introduced through the air cleaner into the first section. The air cleaner is disposed at a front portion of one side half of the engine room and the supercharge is disposed in the other side half of the engine room. A part of the inlet passage including the first and second series is arranged to extend backward from the air cleaner and then to extend further along a dash panel forming a rear end of the engine room from one side half to the other side half of the engine room so as to reach temperature.

Air feeding system for a vehicle engine equipped with a supercharger

Growing community of inventors

Hiroshima, Japan

Takashi Ohtsuru