Mazda Motor Corporation

Kouji Kohno

Hiroichi Takubo

Toshinobu Ito

A cylinder block is provided with a balancer case for accommodating a balance shaft. A blowby passage communicating the interior of the crankcase and the interior of the cylinder head for returning blowby to the intake system is provided to extend through a side wall of the cylinder block and the interior of the balancer case, the interior of the balancer case forming a part of the blowby passage.

Cylinder block structure for internal combustion engine

An internal combustion engine having a pair of balancing shafts carrying eccentric balancing weights and driven in a direction of counterbalancing effects of reciprocating parts. Each balancing shaft is positioned to extend in parallel with the crankshaft and supported by bearings of which upper portions are defined by deck portions formed in the cylinder block. Compact arrangements can be accomplished by the locations of the balancing shafts.

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Hiroshima, Japan

Kouji Kohno