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Chery A11. Manual - part 105

CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

66. Turn over the transmis

167

sion by 90 degree, as shown by the figure;

8. Install the valve plate’s fixing

bolt. The bolt’s tightening

Install the oil pan and oil pan

70. Install the torque converter to

ensure that the converter is

installed to its correct

71.

67. Install the control valve plate assembly to ensure that the manual valve is installed to the

correct position.

torque is 8Nm.

69.

gasket.

position.

Install the transmission

assembly on the vehicle.

CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

e and working principle

ic transmission

ansversely-laid front drive and four gearshifts. The

transmission is comprised of an oil pump, torque converter with a torque shock absorber, four gear

planetary gear mechanism and control system.

nsfer. The 4

gear has a pure mechanical transfer.

rshift is realized by controlling the engagement of shift actuator element, brake and one-way

overrun clutch.

The torque converter is connected with the worm.

sed of an impeller, worm gear, guide roller and case. The case is full of

connection between the drive and driven pieces, hence, no friction inside the converter.

Brief introduction of automatic transmission’s structur

Brief introduction of the automat

4HP14 is an automatic transmission with tr

e 1

, 2

and back gear has pure torque transfer. The power is transferred from the engine to

rque converter, then from the torque converter to the gearbox. 3

gear has a mixed transfer, about

% by torque and 59% by mechanical tra

Gea

e transmission is controlled by shift lever. The shift point is determined by the shift position and

hicle speed.

Torque converter

e torque converter could transfer the power, reduce speed and increase torque.

The converter is compri

draulic fluid. The power is transferred by the hydraulic fluid’s flow. Thus, there isn’t mechanical

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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

and 4

gear to the minimum (due to mechanical

connection at 3

and 4

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

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.

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 t

3. 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

The transmission obtains d

mechanism. The input power is always tra

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CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

Control element

one-way overrun clutch is comprised of an outer racer, inner racer with a roller and one-way

them. The one-way overrun clutch could only transfer the torque along the

e-way overrun clutch.

P14 automatic transmission adopts a one-way overrun clutch at the 1

gear, which works

hich works together with brake C.

s an overrun gear between the

er and inner races. The inner and outer races could rotate freely. When the one-way overrun

nd if the inner and outer races are moving towards opposite

directions, the asymmetric overrun gear is pushed upwards vertically. Hence, the inner and outer

racers are locked to prevent them from rotating towards opposite directions.

one-way overrun clutch is installed inside a dedicated rack.

d brake

The

d by

ferent loads.

r the power to the planetary gear mechanism. The brake C and D engages

inside the planetary gear mechanism. Due to the hydraulic control and

continuous lubrication, there is no friction during power transfer and mechanical friction on the

gearshift elements. Hence, regular adjustment is not necessary.

Brake band

The drum and hub are engaged through tensioning of the hydraulic cylinder’s control brake band in

order to lock the sun gear. Since there is no friction, the brake band could be used continuously.

ent is not necessary.

converter worm gear and worm and sun gear shaft. The planetary rack is fixed by the one-way

overrun clutch’s locking in the counterclockwise direction. The rear sun gear brings along the

short planetary gear and transfers the power to the long planetary gear ring and output shaft.

The

overrun clutch between

rotation direction and rotates freely at another direction.

The vehicle could shift gear smoothly without any obstruction by on

together with brake D, and also at 2

gear, w

One-way overrun clutch

When the one-way overrun clutch rotates at a free direction, there i

out

clutch rotates in its engaged direction a

The

Clutch an

The clutch and brake are mainly comprised of following parts:

Drum

Piston

3. Friction disk, middle retaining ring and steel piece

Diaphragm

spring

gearshift element is engaged or disengage

the hydraulic fluid control clutch between the

drum and piston. When the oil pressure is reduced, the piston returns to its position by the

diaphragm spring.

earshift elements execute gearshift in accordance with dif

The

Clutch A, B and E transfe

or disengages the elements

nce, regular adjustm

Automatic transmission’s power transfer

1. Position D 1

gear’s power transfer route

Clutch A is engaged. The engine’s power is connected with rear sun gear through the torque

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Content .. 103 104 105 106 ..