CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual
The engine’s motion brings along the rotation of case and impeller on the torque converter. The
hydraulic fluid in the impeller dashes from the outside edge of impeller blade to the worm gear
under the centrifugal force to bring along the worm gear’s rotation.
hen the worm gear transfers power, the output torque changes, but not equivalent to the input
torque. The pump roller, worm gear and guide roller’s blades are designed to deflect for certain
degree in order to improve the worm gear’s output torque.
The guide roller is fixed on the converter’s case. The guide roller’s blade is deflected for certain
degree to form circulated fluid flow and increase the worm gear’s output torque. When the vehicle
is started, the worm gear’s output torque could be doubled. The influence of the out torque of the
guide roller on that of the worm gear is related with RPM difference between them. With bigger
difference on their RPM, the worm gear’s output torque is increased or changed more considerably.
When the worm gear stands still, the torque is increased to the maximum. Along with an increased
RPM of the engine’s output shaft, the output torque’s change becomes smaller gradually until the
uivalent to the input torque. At this time, the torque converter only serves as a
ck absorber that is integrated with the converter could reduce the engine’s output
shock and the shock arising from road bumps at 3
rd
and 4
th
gear to the minimum (due to mechanical
connection at 3
rd
and 4
th
gear). The torque shock absorber is connected with the engine’s output
shaft.
tween the torque converter and transmission case and driven directly by the
verter. The oil pump sucks oil through the filter screen and then feeds the oil to the main oil
circuit’s pressure regulator valve on the control system. The excessive hydraulic fluid is returned to
hat the hydraulic oil inside the converter could have
d.
4. Supply hydraulic fluid to the torque control system.
ent.
dopts the Lavlarh planetary mechanism and is comprised mainly of
. One gear ring
ifferent drive ratio by locking different gears on the planetary gear
nsferred to the output shaft through the gear ring. Please
refer to “Automatic Transmission Power Transfer” for the detailed transfer route.
W
output torque is eq
torque connection.
The torque sho
Oil pump
The oil pump is be
con
the oil pump.
The automatic transmission oil pump has following functions:
ain oil circuit. 1. Supply hydraulic fluid to the m
2. Supply hydraulic fluid to the torque converter. Prevent the hydraulic fluid from producing
bubbles.
aulic fluid’s circulation so t3. Lead the hydr
its heat radiate
5. Supply hydraulic fluid to the gearshift elem
6. Lubricate the transmission.
Planetary gear mechanism
4HP14 automatic transmission a
following parts:
1. Two sun gears of different sizes. Each sun gear engages with three planetary gears.
2. One planetary rack
3
The transmission obtains d
mechanism. The input power is always tra
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