Mitsubishi Electric Eclipse Informacje Techniczne Pobierz pdf (Strona 166)

POWER TRAIN

Automatic Transaxle

The valve body and solenoid assembly work

togeth-

er to control five transaxle clutches and the torque

converter clutch. It also directs pressurized fluid

for lubrication. The oil pump is the source of

pressur-

ized fluid for the valve body and solenoid assembly.

The pump is a positive displacement, gear and

cres-

cent type pump. It is driven by the engine through

the torque converter hub.

Fluid for the pump is drawn through the transaxle

filter, through the valve body housing, and into the

Pump

housing

;;rpump

Reaction shafi

support

Seal rings (4)

VALVE BODY AND SOLENOID ASSEMBLY

pump. The pump pressurizes the fluid and sends

it back through the valve body to the regulator valve.

The valve body uses only five valves along with

four solenoids in the solenoid assembly. They

per-

form all functions needed to operate the transaxle

for each of its gear ranges. A brief description on

the operation of each valve and solenoid follows.

Hydraulic Control System

OIL PUMP

The oil pump is located in the pump housing inside the bell

housing of the transaxle case. The

F4ACl

uses a crescent

type gear pump. The inner gear is driven by the torque converter

hub. Torque is supplied to the hub by the engine crankshaft

through the flex plate and torque converter housing.

As the gears rotate, the clearance between the gear teeth

increases in the crescent area and creates a suction at the

inlet side of the pump. Fluid is pulled through the pump inlet

from the oil pan. As the clearance between the gear teeth

in the crescent area decreases, it forces fluid into the pump

outlet. The pressurized oil from the outlet operates the torque

converter, clutches, and the lubrication system. The pump is

held in the housing by the reaction shaft support. The reaction

shaft is splined to and holds the inner race of the torque convert-

stator’s

overrunning clutch.

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