Diaphragm type PCV valve of crankcase ventilation system

Abstract

The invention discloses a diaphragm type PCV valve of a crankcase ventilation system, which comprises an upper shell and a lower shell that are fixedly connected; a pressure ring is arranged on the bottom of the upper shell; a limit post corresponding to the pressure ring is arranged on top of the lower shell; the limit post is sequentially sheathed with a diaphragm plug mesh bracket and a diaphragm from bottom to top; the pressure ring is sheathed on the limit post and props against the diaphragm, and is vertically fixed on the bottom of the upper shell through reinforcing ribs I which are distributed on the inner wall of the upper shell evenly and slantingly downward; the limit post is vertically fixed on the top of the lower shell through reinforcing ribs II which are evenly distributedon the inner wall of the lower shell; the upper shell, the lower shell and the diaphragm plug mesh bracket adopt PA6-GF30 plastic; and the diaphragm adopts soft toughened fluorubber. The diaphragm type PCV valve can improve the vehicle exhaust purifying capacity, stabilize and limit gas flow, guarantee an engine to work safely and steadily, achieve the effect of gas circulation, simultaneously improve air ventilation, reduces weight and mould development cost, and improve the stability of processing technique.

Description

technical field [0001] The present invention relates to engine crankcase ventilation systems, in particular to PCV valves. Background technique [0002] The PCV valve is a metering control valve installed between the engine crankcase ventilation system and the intake system. The PCV valve is controlled by the vacuum degree to adjust the flow of the secondary combustible exhaust gas generated by the crankcase ventilation system into the intake system. Every car has an exhaust pipe to discharge the exhaust gas burned by the engine, but there is no way to discharge the exhaust gas 100%, there will still be a small part of the secondary combustible exhaust gas drilled into the oil bottom through the gap between the piston and the cylinder wall In the shell, once the oil and gas entering the oil pan accumulate too much and cannot be removed, air pressure will be formed, which will not only dilute the engine oil, cause poor lubrication of engine parts, but also cause serious conse...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a diaphragm type PCV valve for the crankcase ventilation system, which can effectively solve the problem of the poor stability of the existing PCV valve, the possibility that the spring cannot be opened, and the secondary combustible waste gas cannot be mixed, and the discharge does not meet the standard.

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