Mazda Motor Corporation

Yasuhiro Okasako

Fusatoshi Tanaka

Kazumi Okamura

Hideo Nakayama

Tsuyoshi Tsuchida

Hirotaka Fukada

Takashige Ishikawa

Hiroyuki Matsumoto

Ken Saito

Nobuyuki Matubara

Hiroyouki Matsumoto

In a rear exhaust engine, an upper portion of a rear portion of a head cover is provided with a first flow redirecting member facing upward and extending rearward and downward toward an exhaust device. A shield cover extending in a width direction of a vehicle is provided behind the first flow redirecting member. The shield cover has a shield surface extending from an upper end portion of the head cover toward a hood and directed rearward. The shield cover is designed such that its upper end is located below a rear end of the first flow redirecting member.

Upper structure of vehicle engine

An intake system for a V-type engine having a plurality of cylinders disposed in each of left and right cylinder banks has a central surge tank which is disposed above the space between the left and right cylinder banks and communicates with the atmosphere through a common intake passage, and left and right surge tanks which are respectively disposed above the left and right cylinder banks. Communicating passages connect the central surge tank with the left and right surge tanks, and discrete intake passages communicate the left and right surge tanks with the cylinders. At least one of the communicating passages on each side of the central surge tank is disposed between the discrete intake passages on the side of the central surge tank.

Intake system for internal combustion engine

Each cylinder bank of a V-type engine is provided with a plurality of cylinders which are not in sequence in firing order. A collecting intake passage is connected to each of the cylinders of both banks by way of independent intake passages which pass between the two banks and have the same effective channel length, and each of the independent intake passages is arranged so that it extends substantially perpendicularly and upwardly from a cylinder. Both collecting intake passages are arranged above one of the cylinder banks, and the collecting intake passage which is connected to a cylinder of the other cylinder bank is arranged on the independent intake passages connected to the other collecting intake passage. By doing so, overlapping of both collecting intake passages can be avoided and thus the height of the intake system can be reduced. The independent intake passages and the collecting intake passage which overlaps the former have a common wall. In one embodiment, each of the collecting intake passages is formed integrally with a high speed intake passage and a low speed intake passage. The vertical positions of the high speed intake passages for each bank are varied. The high speed rear side intake passage is connected to the underside of the low speed rear side intake passage. The low speed and high speed front side intake passages are connected to each other by way of a common side wall.

Intake system for V-type engine

In a V-type engine, the cylinders in one of the cylinder banks are connected to a first communicating passage and the cylinders in the other cylinder bank are connected to a second communicating passage. The cylinders in each cylinder bank do not fire one after another. First and second intake air supply passages are connected to the first and second communicating passages at positions near one end of the communicating passages and extend toward the respective other ends of the communicating passages just above the communicating passages.

V-type engine

Growing community of inventors

Hiroshima, Japan

Yasuhiro Okasako