Subaru SVX 1992 Manual page 398

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Table of Contents

AUTOMATIC TRANSMISSION AND DIFFERENTIAL

A: CONSTRUCTION

Oil pump cover

Oil pump housing

The vane pump is housed in the oil pump housing . It

consists of a rotor, vanes, vane rings, cam ring, control

piston, return spring, seal ring and oil pump cover .

Hydraulic pressure (feedback pressure) from the oil

of the pressure regulator valve is applied

to the back of the control piston .

F B- FUNCTION

1) The automatic transmission fluid (ATF) is drawn

through the oil strainer mounted under the control valve

ASSY, and is routed to the transmission case, to the oil

pump housing, and to the oil pump cover. It then goes

to the suction port of section A shown in the Figure .

2) The ATF sucked into section A rotates in the direc-

tion of the arrow (driven directly by engine), and is

compressed at the delivery side of section B. It is then

discharged .

3) The discharged ATF flows from the oil pump cover

to the oil pump housing. It then goes to the transmission

case, the control valve and to the regulator valve, thus

serving as hydraulic oil and lubricating oil for the torque

converter, valves, clutch and brake.

4) As engine speed increases, the delivery rate of the

vane pump also increases .

5) Feedback pressure from the regulator valve is ap-

plied to section C in the Figure . The cam ring position

(the amount of eccentricity) is controlled by this pres-

sure so that the pump delivery rate remains constant at

speeds exceeding the preset pump speed.

6) As the cam ring position changes, the suction vol-

ume at section A varies . In this manner, the pump

delivery volume is controlled .

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