Engine valve guide pipe and machining method thereof

Abstract

The invention discloses an engine valve guide pipe and a machining method thereof. The engine valve guide pipe comprises a pipe body, the pipe body is provided with a vent hole extending in the axial direction, and at least the inner walls of the ends of the vent hole are provided with wear-resisting ring sections, wherein the wear-resisting property of materials of the wear-resisting ring sections is larger than that of materials of the pipe body. According to the engine valve guide pipe, the working environment of the valve guide pipe is fully considered, the wear-resisting ring sections are arranged at the end, with large friction loss, of the valve guide pipe, the wear-resisting performance of the wear-resisting ring sections is larger than that of the pipe body, and therefore the other parts of the pipe body can be machined through common materials; and the wear-resistant ring sections of the engine valve guide pipe can improve the guide of the valve guide pipe to the reciprocating motion of a valve, the wear of the valve guide pipe is reduced, and meanwhile, the wear-resistant precious metal alloy materials are only used at the wear-resistant ring sections at the two ends of the valve guide pipe, so that the material cost is effectively saved, namely on the premise that the use requirement is met, two aspects of long service life and low use cost can be considered.

Description

technical field [0001] The invention relates to the technical field of engine spare parts, in particular to an engine valve guide and a processing method thereof. Background technique [0002] The engine valve guide is one of the important parts of the automobile engine, and it is the guide device for the engine valve. The heat on the valve stem is transmitted to the cylinder head through the valve guide. [0003] At present, the engine valve guide is press-fitted in the cylinder head and guides the reciprocating movement of the valve. The valve guide is close to the combustion chamber of the cylinder head. During the operation of the engine, the valve guide needs to withstand high-temperature radiation. At the same time, during the exhaust process, the lower part of the exhaust valve guide directly contacts the high-temperature exhaust gas, so that the temperature at the lower end of the valve guide is significantly higher than that at the upper end, resulting in The defor...

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Problems solved by technology

The valve guide is close to the combustion chamber of the cylinder head. During the operation of the engine, the valve guide needs to withstand high-temperature radiation. At the same time, during the exhaust process, the lower part of the exhaust valve guide directly contacts the high-temperature exhaust gas, so that the temperature of the lower end of the valve guide is significantly higher than that of the upper end, resulting in the lower end of the valve guide. Large deformation, prone to abnormal wear of the valve guide

[0004] Considering that the valve guide will be worn during use, precious metal alloy components are usually added to the valve guide during processing to improve its wear resistance, but the use of precious metal alloy components in the entire guide tube causes waste of raw materials

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