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本文涉及的高速柴油机喷油泵的凸轮轴有12个凸轮,凸轮相互的相位角为30°。凸轮表面的轮廓线是由四个半径大小不等的圆弧组成,成为凸圆弧型凸轮。其尺寸大小见图1。凸轮轴的材料为12CrNi_3A,凸轮和工作轴颈表面经渗碳淬火,渗碳层深度成品为1.3～1.7mm,表面硬度为HRC≥58。 喷油泵经过350小时台架试验然后分解,有时会发现某些凸轮轴产生程度轻重不等的麻点。这些麻点有的很小,很浅,只有针尖般大小(见图2),经700小时试车后则进一步扩展;有的剥落层已连成一片,最深达3mm(见图3)。严重时凸轮轴运行175小时后即可发现麻
This article deals with high-speed diesel fuel injection pump camshaft has 12 cams, cam phase angle of 30 ° each other. The outline of the cam surface is composed of four circular arcs of different sizes and become convex arc-shaped cams. Its size shown in Figure 1. The material of the camshaft is 12CrNi_3A, and the surface of the cam and the work journal are carburized and quenched. The depth of the carburized layer is 1.3-1.7mm, and the surface hardness is HRC≥58. After 350 hours of injection pump bench test and then break down, and sometimes find some camshaft produce a degree of severity of pitting. Some of these pits are small, very shallow, only pin-tip-sized (see Figure 2) and expanded after a 700-hour test run; some of the peel layers have been joined together to a depth of up to 3 mm (see Figure 3). Serious when the camshaft run 175 hours after the discovery of hemp