Study on Load Carrying Capacities of Gears with Multiple Layer

分别用四球试验机和功率循环齿轮试验机研究了在463 K左右渗硫的钢球的抗咬合性能和齿轮的抗划伤性能。结果表明，渗硫后钢球的抗咬合性和齿轮的抗擦伤性比未渗硫的提高了1.5-2.0倍，钢球试验中的抗咬合性和齿轮试验中的抗擦伤性之间存在着一定的关系。此外，齿轮的耐擦伤性随着润滑剂粘度的增加而增加。为了阐明镀锡后热扩散的不锈钢球的耐擦伤性和摩擦特性，在浸渍-进给润滑和干摩擦下进行了四球试验。从固化试验中，获得了以下结果。在浸渍润滑条件下，摩擦系数随渗锡层厚度的增加而减小，抗咬合性能随渗锡层厚度的增加而提高。其中扩散层为8 μ m厚的球的抗咬合性是没有扩散层的球的抗咬合性的约2.6倍。此外，在干摩擦下，在使用Sn扩散层的厚度超过4 μ m的球的初始阶段，与其层的厚度无关的运行时间为约5分钟，并且它显著长于没有扩散层的运行时间。

The seizure resistance of balls and the scoring resistance of gears, which are sulphurized at a temperature of about 463 K were investigated by a four-ball machine and a power-circulating gear machine, respectively. As a result, it was clarified that the seizure resistance of the sulphurized balls and the scoring resistance of the suplhurized gears were about 1.5-2.0 times larger than those of the unsuplhurized ones, and a considerable relationship between the siezure resistance in the ball tests and the scoring resistance in the gear tests was recogized. Further, the scoring resistance of the gears was increased with increasing viscosity of the lubricants.To clarify the seiezure resistance and the frictional characteristics of stainless steel ball, which was thermally diffused after Sn-plated, four-ball test was run under dip-feed lubrication and dry friction. From the seizuring test, the following results were obtained. Under dip-feed lubrication, the coefficient of friction was decreased with increasing thickness of the Sn-diffused layer, and the seizure resistance of the ball was increased with increasing thickness of the diffused layer. The seizure resistance of the ball in which the diffused layer was 8 m thick was about 2.6 times larger than that without diffused layer. Further, under dry friction, the running time at the incipient stage of seizuring with the balls in which the thickness of the Sn-diffused layer exceeded 4 m was about 5 min independently of the thickness of its layer, and it was considerably longer than that without diffused layer.