IMPROVED ENGINE PRELUBRICATION PUMP ASSEMBLY

摘要

An engine pre-lubrication pump includes a pump housing (13) with a pump cavity (14) in which a first gear (18) and a second gear (19) are positioned for pumping fluid. The first gear (18) is operably and sealably connected to a motor shaft (16) for rotation and the second gear (19) is rotatably mounted to a second shaft (17) for geared rotation with the first gear (18). Fluid inlet port (21) and outlet port (22) are located in communication with the pump cavity (14) and adapted respectively for connection with a source of fluid and a discharge means and an internal vent 50 is positioned in between the armature shaft (16) or bore and the pump housing (13) along the inlet port (21). Alternatively, a valve means (30) is positioned between the inlet (21) and outlet (22) ports to selectively permit fluid pumped between the inlet (21) and outlet (22) ports to pass through it when the outlet port (22) is flow restricted.