生产实践中,东方红-75/802型拖拉机上装用的CB-46型齿轮式液压油泵,常常发生撕裂卸荷胶圈的现象。经分析,我们认为主要有以下几个原因: (1) 液压油污染严重。我们知道,密封元件再好,也要产生极微小的泄漏。因此,当油泵压力升高后,卸荷胶圈外围的补偿压力油将试图通过端盖与胶圈以及轴套与胶圈之间的缝隙。这样,杂质颗粒 Production practice, Dongfanghong -75 / 802 type tractor used for loading CB-46 gear hydraulic pump, tear often unloading rubber ring phenomenon. After analysis, we think the following several reasons: (1) serious hydraulic oil pollution. We know that sealing elements no matter how good, but also have very small leaks. Therefore, when the pump pressure is raised, the compensating pressure oil at the periphery of the unloader ring tries to pass through the gap between the end cap and the apron as well as the hub and apron. In this way, impurity particles