Geely EC718, EC718RV, EC715, EC715RV. Manual part — 247

3.3.3 System Working Principle
3.3.3.1 Shifting Working Principle

Because the engine output torque and speed range is relatively
narrow, unable to meet the complex requirements of the
vehicle under the conditions of a big range of traction and
speed changes, the role of transmission is to expand the driving
wheel torque and speed range by changing the transmission
ratio, therefore to adapt to constantly changing conditions.

This vehicle's transmission is a five-speed manual
transmission with two axles. There are five forward gears, a
reverse gear, and a neutral gear. Gear shift control is achieved
by controlling the shift shaft. The shift shaft and the shift fork
make the selected synchronizer and gear mesh. The input
shaft torque and speed is delivered to the main shaft, to the
differential, and to the drive axle and wheels.

Neutral Gear Working Status:

FE03-2002b

The shift control does shift the shift shaft and the shift fork.
Synchronizer and the neutral gear are not meshing. Reverse
idler wheel and the input shaft reverse gear and main shaft
output gear are not mesh, No main shaft torque and speed
output.

Reverse

Reverse Gear Working Status:

FE03-2003b

The shift control makes the 5th/Reverse shift shaft and fork
move to rear end of the transmission. Reverse idler wheel and
the input shaft reverse gear and main shaft output gear are
meshing. Main shaft input and output torque and speed is the
same direction.

Transmission / Drive Axle

Manual Transmission

3-31

1st Gear Working Status:

FE03-2004b

The shift control makes the 1st/2nd shift shaft and fork move
to the front end of the transmission. The 1st/2nd gear
synchronizer and 1st gear are meshing. Main shaft receives
the input torque from the 1st gear and outputs torque and
speed opposite to the input shaft.

2nd Gear Working Status:

FE03-2005b

The shift control makes the 1st/2nd shift shaft and fork move
to the rear end of the transmission. The 1st/2nd gear
synchronizer and 2nd gear are meshing. Main shaft receives
the input torque from the 2nd gear and outputs torque and
speed opposite to the input shaft.

3-32

Manual Transmission

Transmission / Drive Axle

3rd Gear Working Status:

FE03-2006b

The shift control makes the 3rd/4th shift shaft and fork move to
the left side (front end) of the transmission. The 3rd/4th gear
synchronizer and 3rd gear are meshing. Main shaft receives
the input torque from the 3rd gear and outputs torque and
speed opposite to the input shaft.

4th Gear Working Status:

FE03-2007b

The shift control makes the 5th/Reverse shift shaft and fork
move to the left side (rear end) of the transmission. The 3rd/
4th gear synchronizer and 4th gear are meshing. Main shaft
receives the input torque from the 4th gear and outputs torque
and speed opposite to the input shaft.

Transmission / Drive Axle

Manual Transmission

3-33

5th Gear Working Status:

FE03-2008b

The shift control makes the 5th/Reverse shift shaft and fork
move to the left side (front end) of the transmission. The 5th/
Reverse gear synchronizer and 5th gear are meshing. Main
shaft receives the input torque from the 5th gear and outputs
torque and speed opposite to the input shaft.

3.3.3.2 Vehicle Speed Sensor Working
Principle

Vehicle speed sensor is a Hall sensor, installed on the drive
gear shaft. When the transmission main shaft rotates, the
vehicle speed sensor operates, so that the vehicle speed
sensor generates signals and sends the signal to the
instrument panel.

3.3.3.3 Reverse Switch Working Principle

Reverse switch is a normally open switch. When the reverse
gear is engaged, the reverse fork will squeeze reverse switch
contact, making reverse switch closed, then the reversing light
circuit is completed and reversing light is lit.

3-34

Manual Transmission

Transmission / Drive Axle