Gear pump drive gear pressure loaded bearing

摘要

One embodiment includes a gear pump with a drive gear, a gear shaft passing through the drive gear, and a pressure loaded journal bearing. Also included is a fluid film, between a surface of the pressure loaded journal bearing and a surface of the gear shaft, and a hybrid pad on the pressure loaded journal bearing. The hybrid pad has a minimum leading edge angular location on the pressure loaded journal bearing of 29.5° and a maximum trailing edge angular location on the pressure loaded journal bearing of 42.5°. The gear pump also includes a porting path for supplying high pressure fluid from a discharge of the gear pump to the fluid film at the hybrid pad.

主权项

1. A gear pump comprising:
a drive gear; a gear shaft passing through the drive gear; a pressure loaded journal bearing configured to support the gear shaft during rotation thereof, the gear shaft supported on a fluid film formed during rotation of the gear shaft between a surface of the pressure loaded journal bearing and a surface of the gear shaft; a hybrid pad recess on the surface of the pressure loaded journal bearing with a minimum leading edge angular location on the pressure loaded journal bearing of 29.5° in a direction of drive gear rotation relative to a bearing flat, and a maximum trailing edge angular location on the pressure loaded journal bearing of 42.5° in the direction of drive gear rotation relative to the bearing flat; and a porting path for supplying high pressure fluid from a discharge of the gear pump to the hybrid pad recess, the high pressure fluid supplementing the fluid film during rotation of the gear shaft; wherein the porting path comprises:
a discharge face cut on the pressure loaded journal bearing for receiving the high pressure fluid from the discharge of the gear pump;a radial spool cut on the pressure loaded journal bearing;an axial hole through the pressure loaded journal bearing for communicating the high pressure fluid from the discharge face cut to the radial spool cut; anda capillary port extending through the pressure loaded bearing from the radial spool cut to the hybrid pad recess for delivering the high pressure fluid from the radial spool cut to the hybrid pad recess.