Gear pump drive gear stationary bearing

摘要

One embodiment includes a gear pump with a drive gear, a gear shaft passing through the drive gear, and a stationary journal bearing. Also included is a fluid film location annularly between a surface of the stationary journal bearing and a surface of the gear shaft, and a hybrid pad location on the stationary journal bearing adjacent the fluid film location. The hybrid pad has a minimum leading edge angular location on the stationary journal bearing of 31.0° and a maximum trailing edge angular location on the stationary journal bearing of 43.0°. 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 stationary journal bearing configured to support the gear shaft during rotation thereof, the gear shaft supported on a fluid film formed annularly between a surface of the stationary journal bearing and a surface of the gear shaft during rotation of the gear shaft; a hybrid pad recess at a hybrid pad location on the stationary journal bearing adjacent to a fluid film location, the hybrid pad recess with a minimum leading edge angular location on the stationary journal bearing of 31.0° in a direction of drive gear rotation relative to a bearing flat, and a maximum trailing edge angular location on the stationary journal bearing of 43.0° 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 stationary journal bearing for receiving the high pressure fluid from the discharge of the gear pump;a radial spool cut on the stationary journal bearing;an axial hole through the stationary journal bearing for communicating the high pressure fluid from the discharge face cut to the radial spool cut; anda capillary port extending through the stationary 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.