Chery SQR 7160 sedan. Manual — part 115

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

st

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

1.

2.

4.

The

d by

g

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.

He

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

4H

together with brake D, and also at 2

nd

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

st

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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CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

2. Position 1 1

st

gear’s power transfer route

Brake D is also engaged. The planetary rack is locked by brake D. The engine’s brake is

realized by its idle rotation resistance.

3. 2

nd

gear’s power transfer route

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

converter worm gear, worm and sun gear shaft. The front sun gear is locked by brake C and

C-shape brake band. 2

nd

gear one-way overrun clutch is in working status. The short planetary

gear brings along the long planetary gear, which rotates around the fixed front sun gear. Thus,

the engine’s power is transferred to the gear ring and output shaft.

4. 3

rd

gear’s power transfer route

About 41% of the engine’s power is torque transferred.

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

orm and sun gear shaft.

About 59% of the engine’s power is mechanically transferred.

The rear sun gear and planetary rack rotate together. The planetary gear mechanism’s drive

ratio is 1:1. The output shaft is driven by the gear ring.

oute

the front long sun gear. The long

planetary gear rotates around front sun gear and brings along the output shaft through the gear

ring.

6. Back gear’s power transfer route

Clutch A engages. The worm is connected with the front sun gear through the brake drum.

Clutch D engages and the planetary rack is locked. Thus, the long planetary gear rotates

oppositely between the front sun gear and the gear ring to bring along the counterclockwise

ut shaft.

Parking brake

r could prevent the pawl’s error action. The vehicle is normally locked even under

aged.

converter worm gear, w

5. 4

th

gear’s power transfer r

Clutch A engages. The engine’s power comes directly from the input shaft to the planetary

rack. The brake band locks the braking drum so to lock

rotation of the outp

The parking brake only works when the control handle is in position P. The brake prevents the

vehicle’s rolling by mechanical method.

The parking brake pawl engages with the parking interlock gear. The interlock gear is again linked

with the driven shaft so to lock the vehicle’s drive gear.

When the control handle is in position P, the setup spring could ensure that brake pawl brakes the

terlock gear at the very moment that the vehicle rolls.

in

The lock stabbe

great traction. The pawl slips on the parking gear at high-speed and only works normally at

low-speed.

Pull the handle to position P only when the vehicle has been stopped completely. Otherwise, the

braking pawl may be dam

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CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

Hydraulic control system

The hydraulic control system controls under following conditions:

1. The control handle’s position or main oil circuit’s pressure;

2. Accelerator pedal’s position or throttle oil pressure;

3. Vehicle speed or regulator oil pressure;

1. Shift

valve

The shift valve controls the hydraulic liquid’s flow circuit in accordance with the control

handle’s position. The hydraulic oil arrives at the clutch and brake through the shift valve and

brake valve from the main oil circuit.

2. Oil pressure control valve (drain valve)

The oil pressure control valve opens when the oil pressure rises to certain value and the hydraulic

fluid flows back the oil pump’s suction chamber. The drain valve is different from relief valve

and is related with the regulator.

The hydraulic system on the main oil pressure control valve plate assembly has its oil pressure

on regulator, throttle, governor and torque converter all supplied by the main oil pressure.

3. Lubrication valve

verter relief valve

The torque converter’s relief valve limits the oil pressure inside the converter.

5. Governor

The governor simulates the engine’s output torque and controls the oil circuit pressure in the shift

elements at each gear. When gear shifted, the governor’s oil pressure is also adjusted accordingly.

When the engine’s output torque is low, the oil pressure inside the control element’s closed oil

circuit is also low;

When the engine’s output torque is high, the oil pressure inside the closed oil circuit is also high.

Since the engine’s rotation speed is low, the engine’s output torque is quite high, the governor must

Step down the accelerator pedal and the governor adjusts the throttle valve’s oil pressure.

2

nd

condition

When it is not necessary to increase the oil pressure, the regulator could work as a relief valve in

order to main continuous and stable oil pressure. The setup spring in the governor decides the oil

pressure. This condition only occurs when the governor’s plug arrives at the end point.

3

rd

condition

Step down the throttle pedal to full at a suitable ignition position and the governor’s oil pressure

could be reduced.

The hydraulic fluid enters into the transmission through the lubrication valve from the torque

converter.

4. Torque con

increase the oil pressure in the oil circuits of different control elements.

The governor works under three conditions:

1

st

condition

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CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

173

6. Throttle pressure regulator

The throttle pressure regulator is a relief valve and adjusts the oil pressure in the throttle oil circuit

when the throttle valve is at different positions.

Idle position

The accelerator pedal is in free condition. The throttle valve’s piston is at the start point and the

throttle valve doesn’t have any oil pressure.

Parking position

Step down the accelerator pedal a little bit. The throttle valve’s piston moves from the start point to

position 1 and adjusts the oil pressure in the throttle valve during this process.

WOT position

Step down the accelerator pedal and the throttle cam moves to kickdown position. The throttle

valve works at position 1 and the piston moves until position 2. The throttle valve’s oil pressure is

regulated during this process.

Kickdown position

Step down the accelerator pedal to full and the throttle cam moves beyond the kickdown position.

The throttle valve works at position 2.

7. Gearshift

valve

Each gear position has a gearshift valve.

The gearshift control element controls the oil circuit so to control which shift valve is working. The

shift valve closes or opens the valve chamber in accordance with the oil pressure control valve

spindle’s moving. The time when the shift moves from position 1 to 2 is related with the linear,

governor and throttle oil pressure.

8. Shuttle

valve

The shuttle valve protects the control element from impact when the oil pressure changes

dramatically to ensure smooth gearshift and prevent shift impact.

9. Shuttle valve and clutch control valve

The position of accelerator pedal or action of the engine output torque control shuttle valve depends

on the pressure regulator valve for oil pressure output. Each clutch control valve works as a relief

valve to control the oil pressure required by the clutch at gearshift.

10. Oil capacity shuttle valves

These shuttle valves are irrelevant with oil capacity and the oil pressure is not controlled by the

main pressure regulator valve. They depend completely on the spring for buffer.

1

st

and back gear lock valve

1

st

and back gear lock valves has two functions:

1. Prevent the engagement of back gear when the vehicle speed has not been lowered down, close

clutch B and brake D’s control oil circuit; this function is realized through the governor and

linear oil pressure.

2. When the control handle is in position 1, the lock valve controls the linear oil pressure at 1

st

-2

nd

shift valve and prevent it from upshift to 2

nd

gear. Hence, the vehicle speed is limited within the