| 摘要 |
A hydraulic gear pump or motor is illustrated in which pressure plates are positioned adjacent to the ends of the gears to provide a dynamic seal therewith. Each pressure plate is provided with a 3-shaped groove on the pressure plate side in which is positioned a U-shaped rubber seal. The seal separates the pressure side of the pressure plate into a high pressure zone in communication with the high pressure port of the device and a low pressure zone in communication with the low pressure port of the device. The seal is pressurized during gear rotation with liquid that is entrapped and pressurized in the zone of intermeshing of the gears. Two orifices communicate between the pressure seal and the high pressure zone of the device to controllably bleed liquid from the seal and prevent excessive pressures from occurring.
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