Sportage 4WD 2Dr L4-2.0L (2002)
Fluid Pump: Description and Operation
Oil Pump
The transmission oil pump is a positive displacement, involute gear system.
The involute gear system consists of a drive (inner) gear (driven by the input shaft) and a driven (outer) gear (driven by the drive gear). The driven
gear's inner teeth are in constant mesh with the teeth of the drive gear. The drive gear is splined to the torque converter hub.
With the engine running, the oil pump produces high pressure through the interaction of the drive and driven gears.
Atmospheric pressure exists within the transmission, via a vent in the transmission case. As the drive and driven gear teeth separate, a low pressure
area is generated. Atmospheric pressure causes transmission fluid to be drawn into the pump, through the suction port, into the area where the gear
teeth separate. Since both gears continue to rotate, this fluid is pressurized as it is trapped between the teeth of the drive gear, driven gear and the
crescent-shaped part of the oil pump body. The high-pressure fluid then exits through the pump's delivery port.
If the drive and driven gears become worn, a noticeable low pressure condition will occur, usually at low engine rpm.
