ELECTRONIC 4WD CONTROL SYSTEM
M–11
M
4WD solenoid control current is ON
• When the 4WD solenoid control current is ON, current flows from the 4WD CM to the 4WD solenoid, and the
coupling operates in the following manner.
1. Magnetic flux forms at the electromagnetic coil of the 4WD solenoid.
2. Due to the magnetic flux in the armature, the pilot clutch is suctioned towards the magnetic coil side and
made to engage. This causes frictional torque to generate in the pilot clutch.
3. The torque is transmitted to the pilot cam, which is engaged with the pilot clutch.
4. A rotational difference is created between the pilot cam and the main cam. Due to this relative torsion, the
cam mechanism operates, transmitting torque from the pilot cam to the ball and then to the main cam. In
this way, the push force exerted on the main clutch is amplified.
5. As the main clutch engages, the drive torque from the front wheels is transmitted to the rear wheels.
• The amount of push force exerted on the main clutch by the main cam (that is, the strength of the drive torque
transmitted to the rear wheels) changes in accordance with the proportion of the force acting upon the pilot
cam, engaged with the pilot clutch. Therefore, by changing the periodicity of the electric current from the 4WD
CM to the 4WD solenoid (ON/OFF rate of the 4WD solenoid = force acting on the pilot cam), the module
controls the transmission of drive torque to the rear wheels.
.
End Of Sie
9
8
7
5
4
3
10
11
6
1
2
5
6
7
12
A6E63222005
1 Main clutch
2Pilot clutch
3 4WD solenoid (Electromagnetic coil)
4 4WD control modure (4WD CM)
5Main cam
6Pilot cam
7Ball
8Armature
9 Drive torque
10 Magnetic flux
11 Input
12 Output
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