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...

AI Technical Summary

Problems solved by technology

Therefore, the leaking gas cannot flow back smoothly

This causes the following disadvantages: The oil quality drops sharply and the lubricating performance of the engine decreases

This causes the following disadvantages: the volume of the cylinder block is increased to generate a large number of casting holes and the quality of the raw material is poor

This results in the following disadvantages: These pins are prone to sand sintering

Also, since the surface pressure on the cylinder head gasket is concentrated next to the cylinder block side bolt holes, no surface pressure can be developed between the adjacent cylinder head mounting bolts

This in turn leads to the following disadvantages: the surface pressure distribution on the cylinder head gasket is not uniform, so that the sealing performance of the cylinder head gasket is reduced

This leads to the following further disadvantage: the transverse width of the cylinder head increases and thus the size of the engine

also, Figure 20 The oil level gauge shown can only be supported in one position on the oil level gauge mounting hole on the front cover of the cylinder

This causes the following disadvantages: the handle part of the oil level gauge is shaken and oil leakage occurs so that the work of the oil level gauge is unreliable

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