Nissan Motor Company Limited

Hironao Netsu

Shin Nomura

Takuya Taniguchi

Yukihiro Hayashi

Hideaki Tooyama

Jun Ota

An internal combustion engine cylinder head has a water jacket, a plurality of female threaded portions for attaching an exhaust component, and a plurality of bulging portions protruding into the water jacket. The water jacket has inlet portions for receiving cooling water and outlet portions for discharging the cooling water. The inlet portions are disposed in a central position of the water jacket in a cylinder row direction. The outlet portions are disposed on a lateral side of the cylinder head to which the exhaust component is attached. A spacing between the outlet portions is wider than a spacing between the inlet portions. The female threaded portions protrude into the water jacket so that the cooling water crosses an area around the female threaded portions in the cylinder row direction. The bulging portions extend from ends of the female threaded portions towards where the inlet portions are located.

Cylinder head for internal combustion engine

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

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.

A cam angle mounting structure includes a cylinder head, a sensor bracket and a head cover. The cylinder head is configured and arranged to rotatably support a camshaft. The sensor bracket is configured and arranged to support a cam angle sensor. The sensor bracket is mounted on the cylinder head with the sensor bracket contacting the cylinder head. The head cover is non-rigidly mounted on the cylinder head and the sensor bracket via at least one gasket to cover a top opening of the cylinder head with a space being formed around the at least one gasket between the head cover and the cylinder head and between the head cover and the sensor bracket.

Cam angle sensor mounting structure

A cylinder head structure for a multi-cylinder internal combustion engine that is mounted on a vehicle so that a cylinder alignment direction goes along a front-rear direction of the vehicle comprises a cylinder head side wall, an upper deck, and a rib. The cylinder head side wall projects on a periphery of the cylinder head and is provided along the cylinder alignment direction. The upper deck is formed on the cylinder head so as to be positioned between portions of the cylinder head side wall, wherein the upper deck further includes an oil return hole formed near a portion of the cylinder head side wall. The rib extends in a width direction of the cylinder head and is formed on the upper deck in a rear side of the oil return hole.

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Kanagawa, Japan

Hironao Netsu