Nissan Motor Company Limited

Takuya Taniguchi

Hironao Netsu

Yukihiro Hayashi

Kazuki Arima

A sleeve structure comprises a plurality of sleeve main bodies fitted respectively into intake ports of a cylinder head of a multi-cylinder internal combustion engine and a shared base provided on one end of the plurality of sleeve main bodies. By fixing this sleeve structure to the cylinder head, an amount of labor involved in a fixing operation for fixing sleeves to a cylinder head is reduced.

Intake passage structure for multi-cylinder internal combustion engine

The present invention provides a die assembly for molding a resin-made insert having a sleeve that is inserted into an intake port of an internal combustion engine. Each sleeve has one inlet and two outlets. The die assembly includes an inner die and an outer die. The inner die includes an inlet side part and an outlet side part. The inlet side part and the outlet side part mold an inner peripheral surface of the sleeve in an assembled state, and are removed in mutually opposite directions. By means of this assembly, a sleeve having a complicated structure and shape can be molded easily.

Die assembly for intake port insert

Fuel injection valveseach inserted into injection valve mounting holesare fixed to cylinder headthrough bifurcated clamps. Clampseach include base portionbrought into abut contact with and supported on middle boltwhich is disposed at the middle portion of cam bracket, bifurcated tip end portionpressing fuel injection valve, and intermediate portionfastened by bolthaving a tip end portion which is screwed into cylinder head. Four clampsare arranged on a straight line along a direction of a row of cylinders. Respective clampscorresponding to cylinders #and #and respective clampscorresponding to cylinders #and #are arranged symmetrically with each other such that base portionsare disposed on an outside. Core supporting holeis disposed at a central portion of cylinder headwhich is free from coverage by clamp. With this construction, it is possible to effectively release gas.

Growing community of inventors

Kanagawa, Japan

Takuya Taniguchi