Types of Transfer
1.FR ear differential.
The center differential and front differential are contained within the transfer.
2. FR based full-time 4WD
In this type, the power is transmitted from the transmission to the center differential and to the front differential and rear differential.
3. FR based part-time 4WD
In this type, when the transfer is not connected, the power is transmitted from the transmission to the rear differential. When the transfer is connected, the power is transmitted to the front and rear differential.
Types of Center Differential Gear
The center differential serves the role of absorbing any rotational difference generated between the front and rear wheels during cornering. The following types of gears are used for absorbing the rotational difference.
1. Bevel gear type
The bevel gear type center differential distributes the torque to the front and rear in the ratio 1:1.
2. Planetary gear type
The bevel gear type center differential distributes the torque to the front and rear in the ratio 1:1, but the planetary gear type can vary the distribution of ratio.
Types of Center Differential Limit Control Mechanism
When attempting to get out of deep snow or escape from a mud-hole, it is necessary to limit the differential action of the center differential. There are the following types of center differential limit control mechanisms.
1. Mechanical locking type
Switching between “FREE” and “LOCK” is accomplished manually.
2. Torque sensing type
It generates a limited-differential torque in proportion to the drive torque, and instantly changes the front and rear torque distribution in order to restrain the slippage of the front and rear wheels.
3. Viscous coupling type
Limitation of differential operation depends on difference in rotational speeds between front and rear wheels.
4. Hydraulic multi-plate clutch type
Differential is limited by hydraulic pressure being applied to multiple disc clutch.