Protege LX L4-1489cc 1.5L DOHC MFI (1998)
Fluid Pump: Description and Operation
HYDRAULIC CONTROL SYSTEM
Oil Pump
Outline
A variable capacity trochoid oil pump is used for improved discharge efficiency and reduced fuel consumption. The former involute gear oil pump
discharged oil in proportion to the engine speed. The variable capacity pump also outputs oil in proportion to engine speed but, when the engine
reaches a certain rpm, the output of the pump is fixed at a maximum to minimize the drive torque losses caused by the pump.
Construction
An outer rotor, inner rotor, and oil pump flange are installed within the pump housing of the trochoid gear oil pump. The oil pump flange and oil pump
shaft are coupled to the inner rotor. The other end of the oil pump shaft is coupled to the pump impeller side of the torque converter, and via the
converter, to the engine. As a result, the oil pump flange, the inner rotor, and the outer rotor rotate unitedly with the engine. A spoof and spring
installed in the discharge section of the pump housing regulates the oil discharge.
