Mazda Motor Corporation

Yoshihiro Nakagawa

Tsuyoshi Goto

Fusatoshi Tanaka

Kouichi Hatamura

Hiroshi Sumimoto

Kenya Ishii

Takayuki Tanaka

To improve the efficiency of assembling multiple on-off valves into a manifold body and reduce resistance to rotation of a shaft after assembly, frame members ( ) are fitted in downstream end portions of individual intake passage sections ( ) of a manifold body ( ), on-off valves ( ) are placed inside the individual frame members ( ) and a shaft ( ) is passed through the on-off valves ( ) in such a way that the frame members ( ) constitute parts of inside walls of intake passages where the on-off valves ( ) are located, the frame members ( ) rotatably supporting the on-off valves ( ) and the shaft ( ). A cutout ( ) is formed in a surrounding wall of each frame member ( ), thereby making each frame member ( ) expandable and compressible by elastic deformation. Protruding walls ( ) swelling outward on both sides of the cutout ( ) are formed on each frame member ( ), and a recessed part ( ) for accommodating the protruding walls ( ) is formed in a wall surface of each intake passage section ( ) of the manifold body ( ). Further, there is formed a guide rail ( ) which fits in the cutout ( ) in the recessed part ( ).

Intake manifold of engine

An intake system comprises an intake passage provided, in order from an upstream side of the intake passage, with a throttle valve, a mechanical compressor supercharger and an inter-cooler for delivering supercharged air discharged by the supercharger into cylinders of an internal combustion engine. The intake passage has a supercharger bypass passage for allowing an intake air flow to bypass the supercharger, and an inter-cooler bypass passage for allowing a supercharged air flow to bypass the inter-cooler. Pneumatic valves, disposed, respectively, in the supercharger and inter-cooler bypasses passages, are controlled to open both the bypass passages when the internal combustion engine operates in a range of lower loads, to open at least the supercharger bypass passage when the internal combustion engine operates in a range of medium loads, and to close both the bypass passages when the internal combustion engine operates in a range of higher loads.

Intake system with mechanical supercharger for internal combustion engine

Growing community of inventors

Fuchu-cho, Japan

Yoshihiro Nakagawa