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车用发动机的凸轮轴一般用冷激铸铁制成。但是,由于对高性能发动机的要求越来越高,就需要采用一种凸轮间隔小的多凸轮凸轮轴,而要制造价格适中的传统式冷激铸铁凸轮轴是有困难的。在使用摇臂式气门机构的情况下,必须要有较高的耐磨性。丰田公司为解决上述问题,研制了有表面再熔激冷层的凸轮轴,并与1984年开始大量生产。最初将其用于1升1E型发动机上,后来又用于1.3升2E发动机上。 本文介绍了这种凸轮轴的良好的耐磨性、低制造成本及其独特的制造方法。在日本,E系列发动机是最早采用这种凸轮轴的机型。这种凸轮轴的制造要经过“再熔处理”,即用钨隋性气体(以下简称TIG)保护焊电弧这样的高密度能源使铸铁凸轮轴的表面迅速地再熔化,再熔区靠自冷迅速凝固,形成了高耐磨性的致密的冷激组织硬化层。
Automotive engine camshafts are generally made of chilled cast iron. However, with the demand for high-performance engines getting higher and higher, a multi-cam camshaft with a small cam interval needs to be adopted. However, it is difficult to manufacture a conventional chilled cast iron camshaft at a moderate cost. In the case of rocker valve mechanism, must have higher wear resistance. To solve the above problem, Toyota Company developed a camshaft with a surface re-fusing chilled layer and started mass production in 1984. It was initially used on a 1 liter 1E engine and later on a 1.3 liter 2E engine. This article describes the good wear resistance of this camshaft, low manufacturing costs and its unique manufacturing method. In Japan, E-series engines are the earliest models to adopt such camshafts. This camshaft manufacturing to go through “re-melt processing”, that is tungsten inert gas (hereinafter referred to as TIG) to protect the welding arc high-density energy so that the surface of the cast iron camshaft rapidly remelting, remelting zone by self-cooling Rapid solidification, the formation of a high wear resistance of the dense cold tissue hardening layer.