PCV valve and lower valve body assembly thereof

Abstract

The invention discloses a PCV valve and a lower valve body assembly thereof. The PCV valve comprises an upper valve body and a lower valve body, wherein the upper valve body is perpendicularly located above the lower valve body; a bottom port of the upper valve body is connected with a top port of the lower valve body in a communicated mode; an annular retaining ring groove is formed in the inner edge of the bottom end of the upper valve body in a sunken mode; a fixedly-connected retaining ring is clamped in the annular retaining ring groove; a valve cavity is formed in the lower valve body; a vertically-arranged valve element is arranged in the valve cavity; and the top end of the valve element penetrates through the retaining ring and stretches into the inner bottom of the upper valve body. A lower valve body assembly structure formed by combining metal and plastic materials is adopted, and annular grooves which are evenly distributed are formed in the valve cavity, so that resonance, caused by gas instability, of the valve element of the PCV valve can be stabilized, and noise, caused by resonance, of the valve element of the PCV valve is lowered; the metal valve cavity and the plastic lower valve body are formed through injection molding by adopting an inverted buckle structure, so that the firmness of the metal valve cavity is ensured.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a PCV valve and its lower valve body assembly. Background technique [0002] The PCV valve of the crankcase forced ventilation system is an important part of the engine. When the engine is working, the combustible gas mixture in the cylinder is under high temperature and high pressure, and some gas will always leak into the crankcase through the gap between the piston and the cylinder, causing blow-by. The mixture of these blow-by gases and engine oil will form dense colloidal sludge, and then form acidic corrosion products, which will corrode and rust the internal bearing surface of the engine, accelerate the wear of parts, and cause the rust of the internal working surface of the engine. Discharge will cause the pressure of the crankcase to rise, causing the lubricating oil to seep from the oil seal gasket. In order to control the emission pollution of the crankcase...

AI Technical Summary

Problems solved by technology

The plunger PCV valve can be divided into plastic spool and metal spool according to the material of the spool. The plastic spool has poor wear resistance, and the spool running at high speed is easy to wear. The worn spool makes the engine PCV valve flow characteristics Offset, affecting the normal operation of the engine

The metal spool moves axially inside the valve body, and the plastic inner cavity is prone to wear due to the reciprocating motion of the metal spool. In addition, the pressure of the intake manifold changes within a certain range with the speed, and the metal spool is under the impact of unstable airflow. Resonance and high-speed knocking on the inner wall of the cavity, especially when the engine is idling or at medium and low speeds and high loads, there is a common sharp knocking sound, which affects the NVH performance of the engine

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