Great Wall Hover. Manual - part 26

Automatic transmission-35

Power transmission  

automatic 2

nd

-Gear and manual 2

In automatic 1

st

 and manual 2

nd

-Gear, the drive of transmission reaches the front clutch cylinder through the input shaft. In this

condition, the operating principle of each functional unit of transmission is shown as follows:

The engagement of clutch C2 drives the forward central gear.
The forward central gear drives the short planetary gear to rotate in anticlockwise.
The short planetary gear drives the long planetary gear to rotate clockwise.
The engagement of brake belt B1 makes the stop of reverse central gear to make the long planetary gear rotates around the
reverse central gear, then make the internal gear and output shaft rotates in clockwise to make the vehicle moves forwardly.
The clutch C4 is engaged through the 3-4 one-way clutch (OWC) and provides the brake force of engine during overspeed.

Control:

In stable status, the status action of solenoid valve and valve is shown as follows:

The solenoid valve S1 is powered off ; The solenoid valve S2 is powered on.
The drive oil (line pressure) from the manual-operated valve makes the engagement of clutch C2.
When the solenoid valve S1 is powered off, the S1 oil pressure form line pressure 500 pushes the 3-4 Gear shifting valve
moves to left. At the same time, the S1 oil flows into the 1-2 Gear shifting valve to push the 1-2 Gear shifting valve to the
2

nd

 –Gear.

The line pressure oil from the 1-2 Gear shifting valve flows into the brake belt combination regulating valve, and 2-3 Gar
shifting valve.

The brake belt engagement regulator valve provides the 2

nd

-Gear oil (controlled by product of line pressure and valve rate)

                 to brake belt feed loop (BAF).

The brake belt engagement feed loop directly provides the oil to:
External engagement part of front servo piston.
1-2 Gear shifting valve can provide a oil drainage port when the transmission is shifted to 1

st

-Gear.

Use the 3-4 Gear shifting valve when the transmission is in 4

th

-Gear position.

The drive force (line pressure) is sent to the clutch C4 through the 3-4 Gear shifting valve to realize the engagement of
clutch C4.

Refer to Figure 5.5 and table 5.6

Table 5.6

The participating condition of each unit in automatic 2

nd

-Gear and manual 2

nd

-Gear

Automatic 2

nd

-Gear and manual

2

nd

-Gear

  

Name of participation unit

Automatic transmission-36

Figure 5.5 

Automatic 2

nd

-Gear

manual 2

nd

-Gear

Automatic transmission-37

power transmission  

Automatic 3

rd

-Gear and manual 3

rd

-Gear

In automatic and manual 3

rd

-Gear, the drive of transmission reaches the front cylinder through the input shaft. In this condition,

the operating principle of the transmission is shown as follows:

 The engagement of clutch C2 drives the front sun gear

   The engagement of clutch C1 drives the planetary gear carrier

 The forward central gear and planetary gear carrier rotate in the same speed clockwise. So, there is not relative motion

       between the forward central gear and planetary gear.

 The gear ring and output shaft rotate in the speed of output shaft, and makes the moves forwardly.

   The engagement of clutch C4 is through the 3-4 one-way clutch  (OWC) and make the engine to provide the brake force

       in overspeed.

Control:

In stable status, the status of solenoid valve and valve is shown as follows:

   The solenoid valve S1 is powered off; Solenoid valve S2 is powered off
   When the solenoid valve S1 and S2 is powered off, 2-3 and 3-4 shift valve are kept in 3

rd

-Gear position through the line

        pressure 500.

   1-2 Gear shifting valve is kept in 3

rd

-Gear position by the oil pressure of S1 and S2.

The (line pressure)oil form the 1-2 Gear shifting valve flows into the brake belt combination regulating valve directly and

       flows into the 2-3 Gear shifting valve.

   The brake belt combination regulating valve provides the 2

nd

-Gear oil (controlled by the product of line pressure and valve)

       to the brake belt feed loop(BAF).

   The brake belt feed loop directly provides the oil to:
    External combination part of front servo
   When the transmission is shifted to 1

st

-Gear, the 1-2 Gear shifting valve provides the oil drainage port.

    When the transmission is in 4

th

 –Gear position, it will use the 3-4 Gear shifting valve.

   The 2

nd

-Gear oil of 2-3 Gear shifting valve flows into the 3

rd

-gear loop directly .

   The 3

rd

-Gear oil from the 2-3 Gear shifting valve flows into the clutch combination regulating valve and sequence valve of

       4-3 Gear directly.

   The clutch combination regulating valve provides the oil of  clutch attachment feed loop  (controlled by the product of line

       pressure of 500 and valve ratio) (CAF).

   CAF directly provides the oil to :
    clutch C1
    Sequence valve of 4-3 Gear
    In 4-3 Gear shifting valve, the CAF oil is changed to the release fluid of B1 (B1R-F), it cause the closing of brake belt 1

                 through the 3-4 Gear shifting valve to spring bottom of 4-3 gear sequence valve and release side of front servo.

    The drive force (line pressure ) is sent to the  clutch C4 through the 3-4 Gear shifting valve to engage the clutch C4 .

Refer to Figure 5.6 and Table 5.7.

Table 5.7

Table of participating condition of each unit in automatic and manual 3

rd

 –Gear

   

C l u t c h

Name of participation unit

Automatic and manual

3

rd

 –Gear

Automatic transmission-38

Figure 5.6   

Automatic 3

rd

 –Gear

-manual 3

rd

-gear