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首页> 外文会议>International Conference on Powder Transmission Components, Advances in High Performance powder Metallurgy Applications, Oct 16-17, 2001, Ypsilanti, Michigan >Improvements in P/M Pump Gears
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Improvements in P/M Pump Gears

机译：P / M泵齿轮的改进

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摘要

Hydraulic pumps are used in many construction and agriculture applications vehicles. Many low pressure applications like engine lubrication and automatic transmission pumps can be serviced with pumps with as-sintered gears or gerotors. Some higher pressure pumps might use higher density and/or heat treated gears. Many pump applications are for continuous duty. Some pumping applications require high pressure continuous duty with an intermittent higher pressure. These extra demands can tax the longevity of a pump. Improvements in P/M technology can enable a pump meet a demanding application with improved durability. The pumping application described here has Powder Metallurgy gears and requires 4,000 psi system pressure during some intermittent operations. The initial pump gears made from heat treated FN 0205 at 7.4 g/cm~3 minimum density could not reliably perform in the field without the gears failing from fatigue. Changing the gears to carburized FLN2 4400 at the same density enabled the pump to easily meet the pressure without gear failures. Under lab test conditions the cycle life went from gear failures in 62,000 cycles at 4000 psi, to no gear failures in 10,000,000 cycles at 4,500 psi.
机译：液压泵用于许多建筑和农业应用车辆。许多低压应用（例如发动机润滑和自动变速箱泵）可与带有烧结齿轮或短齿轮的泵一起使用。一些更高压力的泵可能会使用更高密度和/或经过热处理的齿轮。许多泵应用是连续工作的。某些泵送应用需要高压连续负载和间歇高压。这些额外的要求会加重泵的使用寿命。 P / M技术的改进可以使泵满足耐用性提高的要求。此处描述的泵送应用具有粉末冶金齿轮，并且在某些间歇操作中需要4,000 psi的系统压力。如果最初的泵齿轮由经过热处理的最小密度为7.4 g / cm〜3的FN 0205制成，则在齿轮中不会由于疲劳而失效。以相同的密度将齿轮换成渗碳的FLN2 4400，可使泵轻松满足压力而不会出现齿轮故障。在实验室测试条件下，循环寿命从4000 psi的62,000个循环的齿轮故障变为4,500 psi的10,000,000循环的无齿轮故障。

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