Push-rod capable of eliminating heat expansion clearance of valve of motorcycle engine

Abstract

A post rod capable of eliminating the air drain thermal expansion gap of motorcycle engine, comprises a rod in the middle and the steel balls on the two ends, and the rod is tightly bonded by aluminium core and steel tube. The aluminum core can be made of pure aluminuim or aluminum alloy, and the pure aluminum is preferred, the steel tube can be made of structural carbon steel, structural alloy steel or other steel materials, and the structural carbon steel is preferred. The invention improved the engine power.

Description

technical field [0001] The invention relates to an engine gas distribution mechanism, in particular to a push rod used in an overhead valve cam type gas distribution mechanism capable of eliminating thermal expansion gaps of motorcycle engine valves. Background technique [0002] The motorcycle engine has to go through a process from "cold car" to "hot car". For the motorcycle engine with overhead valve and lower cam valve mechanism, when the body reaches the normal working temperature, the valve will produce a certain amount of vibration. Thermal expansion gap, resulting in insufficient air intake, dirty exhaust, reduced engine power, and high impact noise. The existing technology uses more stainless steel ejector rods, which can meet the strength requirements of the valve mechanism for the ejector rods, but its thermal expansion rate is not high. At 20°C-200°C, the linear expansion coefficient is about 17*10 -6 , It is impossible to fully make up the thermal expansion gap...

AI Technical Summary

Problems solved by technology

[0002] The motorcycle engine has to go through a process from "cold car" to "hot car". For the motorcycle engine with overhead valve and lower cam valve mechanism, when the body reaches the normal working temperature, the valve will produce a certain amount of vibration. Thermal expansion gap, resulting in insufficient air intake, unclean exhaust, reduced engine power, and high impact noise

The existing technology uses more stainless steel ejector rods, which can meet the strength requirements of the valve mechanism for the ejector rods, but its thermal expansion rate is not high. At 20°C-200°C, the linear expansion coefficient is about 17*10 -6 , cannot fully compensate for the thermal expansion gap of the valve. At the normal operating temperature of the engine, there is still a gap of about 0.11mm in the valve

In order to solve this problem, people have also considered using a material with a high thermal expansion rate as the ejector pin. The prior art has selected an aluminum alloy ejector pin whose high thermal expansion rate can eliminate the thermal expansion gap generated by the valve, but considering The strength of the welding between the aluminum alloy and the steel ball is not enough. Therefore, in the prior art, a steel piece is embedded at both ends of the ejector rod. However, the steel piece is combined with the aluminum body, and it is easy to loosen after a period of use, which affects the use effect. The aluminum alloy mandrel also has the problem of high cost

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