Multi-metal structure valve

Abstract

The invention provides a multi-metal structure valve. The multi-metal structure valve is composed of a valve head and a valve rod. The valve head comprises a valve disc part and a valve neck part. Thevalve disc part comprises a disc end face, a disc outer circle and a disc conical face. The valve head can be divided into a small disc and an outer circular ring in the annular direction. The smalldisc and the outer circular ring are made of different metal materials and are tightly combined. The disc outer circle, the disc conical face and the disc end face are partially located on the outer circular ring. The multi-metal structure valve can meet the requirements for abrasion resistance and corrosion resistance of the valve conical face and the requirements for tensile strength, yield strength and fatigue strength of the valve neck part in a high-temperature state, and better work reliability is achieved. The multi-metal structure valve can be adopted in existing common single-metal integral material structure valves, double-metal friction welding structure valves, surface treatment valves, hollow sodium-cooled double-metal valves and the like in the valve blank stage.

Description

technical field [0001] The invention relates to an engine valve. Background technique [0002] After more than one hundred years of development, the four-stroke engine has become an extremely extensive power machine. As the key basic part of sealing the intake and exhaust ports during the working process of the engine, the valve is used to block the airflow channel and control the gas exchange of the engine. The intake and exhaust valves have developed from the initial single-metal overall structure valves to bimetallic welded structure valves, single-metal or bimetal surfacing alloy valves, surface-treated valves, hollow sodium-cooled bimetallic valves, etc. (For the valve structure type, refer to the automotive industry standard QC / T469-2016 "Technical Conditions for Automobile Engine Valves"). [0003] Valves with different structures are suitable for different engine operating conditions. For example, low-load engines often use single-metal integral structure valves or ...

AI Technical Summary

Problems solved by technology

Example 1. For valves with high working temperature, the bimetallic welding structure of nickel-based superalloy is often used to meet the tensile strength, yield strength and fatigue strength of the valve at high temperature. Corrosion performance may not meet engine service life and durability requirements

Example 2. When using nickel-based high-temperature alloy bimetallic welding valve, in order to further meet the wear resistance and corrosion resistance requirements of the valve cone surface, the industry often adopts the cone surface welding wear-resistant and corrosion-resistant alloy, that is, a The annular groove, and then surfacing wear-resistant and corrosion-resistant alloy in the annular groove. After the conical surface is surfacing alloy, the service life and durability of the valve are greatly improved, but there is a problem that the reliability of the conical surface surfacing welding process is not high. Therefore, the conical surfacing structure is subject to relatively large use restrictions. As long as the bimetallic welding valve can meet the requirements of the engine, the conical surfacing structure is often not used.

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