Nissan Motor Company Limited

Renault S.a.s.

Aichi Kikai Kogyo Kabushiki Kaisha

Satoshi Murata

Masatoshi Hada

Naoyuki Satou

A cooling water passage structure of internal combustion engines is provided which can contribute to a scale-down of the external form of the engine and also can prevent deformation of the cylinder bores. The cooling water passage structure comprises a water jacket for the flow of cooling water provided on the peripheries of a plurality of cylinder bores; and a lateral suction passageintegrally formed with a side wall of a cylinder blockhaving bolt holes formed for fastening a cylinder headThe lateral suction passage runs through by the cylinder bores at a height in the vicinity of the water jacket bottom and is arranged on the outside of, and perpendicular to the bolt holes. On the rear surface of the cylinder headis mounted a water passage blockand on the front end part of the cylinder blockis provided a water pump housing

Cooling water passage structure of internal combustion engines

A cylinder block structure with a small number of ribs is provided which can favorably prevent the deformation of a crankshaft bearing portion. In a cylinder block having bolt holes formed on the upper surface for connecting a cylinder head with bolts, arcshaped coupling surfaces formed on the rear end surface for mounting a housing, such as a transmission housing, and a crankshaft bearing portion formed in the central part between the lower ends of the coupling surfaces, the upper parts of the coupling surfacesare joined into an arch-shape by an arch-shaped rib, the lower ends of right and left bosses are extended and connected to the lower parts of the arch-shaped rib, and right and left main radial ribs extend from the outside of the lower end of the bolt hole boss to the center of the crankshaft bearing portion.

Cylinder block structure

In a water-cooled engine cylinder block, a lower end of a water jacket outer wall and a cylinder wall are joined by a water jacket base wall, and coolant is led into a space formed by the cylinder wall, water jacket base wall and water jacket outer wall. A bend part having a crank shape cross-section is formed in the water jacket base wall. As a result, the rigidity of the water jacket base wall decreases so that transmission of the axial tension of the head bolt to the cylinder wall is suppressed, and deformation of the cylinder wall is suppressed.

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Yokohama, Japan

Satoshi Murata