Leaked fuel gas return-flow structure for engine

Abstract

A blowby gas-returning structure for an engine which is adapted to provide smooth returning of a blowby gas, and to provide a light-weight or compact engine. The blowby gas-returning structure is provided with passage-forming object or wall in order to continue blowby gas passages without interruption. Further, the cylinder block may be provided with void space sections which share space with the blowby gas passages and the cylinder head-mounting bolt holes. In addition, the blowby gas passage in the cylinder head may be disposed offset substantially midway along the length thereof.

Description

technical field [0001] This application is a divisional application of the patent application with the application number 97120232.X, the application date being October 29, 1997, and the title being "leakage gas return structure of engine". [0002] The invention relates to a leaking gas return structure of an engine, in particular to a leaking gas return structure of an engine which can smoothly return the leaking gas. Background technique [0003] In the engine, gas leaks from the combustion chamber into the crankcase through the gap between the piston and the cylinder liner. The main component of the leakage gas is the unburned gas containing a large amount of hydrocarbon (HC), which needs to flow back into the combustion chamber for reburning. For this purpose, a blowby gas recirculation system is used, in which, as is known, the flow rate control valve (PCV valve) is driven with the intake manifold pressure of the intake system as the loading state of the engine, so th...

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