TRANSFER

H4 Position

1. In the H (H4) position, the splines at the rear of the transfer input shaft mesh with the internal gear teeth of the high and low clutch sleeve.

2. Also, the transfer high and low clutch sleeve is meshed to the differential case. Thus, the rotation of the input shaft is transmitted to the transfer high and low clutch sleeve, the differential case.

   

   *1	Planetary Pinion Gear	*2	Transfer Low Planetary Ring Gear
   *3	Transfer Input Shaft	*4	Differential Case
   *5	Transfer High and Low Clutch Sleeve	*6	Planetary Spline Piece
   *7	Planetary Carrier	*8	Transfer Low Planetary Pinion Gear
   *9	Planetary Ring Gear	*10	Planetary Sun Gear (Input Shaft)
   *11	Planetary Carrier (Pinion Shaft)	-	-

L4 Position

1. In the L (L4) position, the external teeth of the transfer high and low clutch sleeve are meshed with the planetary spline piece.

2. Thus, the rotation of the transfer input shaft is transmitted in a reduced form to the planetary sun gear, planetary pinion gear, planetary pinion gear shaft, planetary carrier, planetary spline piece, transfer high and low clutch sleeve, and differential case.

   

   *1	Planetary Pinion Gear	*2	Transfer Low Planetary Ring Gear
   *3	Transfer Input Shaft	*4	Differential Case
   *5	Transfer High and Low Clutch Sleeve	*6	Planetary Spline Piece
   *7	Planetary Carrier	*8	Transfer Low Planetary Pinion Gear
   *9	Planetary Ring Gear	*10	Planetary Sun Gear (Input Shaft)
   *11	Planetary Carrier (Pinion Shaft)	-	-

Normal Driving Operation

1. During normal driving (front wheel speed = rear wheel speed), the driving force that is input by the center differential case is transmitted (Front: 40/ Rear: 60) as shown below, without involving the LSD function.

   

   *1	Ring Gear	*2	Center Differential Case
   *3	Sun Gear	*4	Planetary Carrier
   *5	Pinion Gear	-	-
   *a	Input Torque	*b	Rear Output Torque
   *c	Front Output Torque	-	-

   Figure 1. Torque Transmission Path

   

Front Wheel Skid Driving Operation

1. During front wheel skid driving (front wheel speed > rear wheel speed) when a rotational difference exists between the sun gear and the ring gear, the torque distribution of the driving force (torque) that is input by the differential case changes instantly before the torque is transmitted, as follows:

   
   

   • The sun gear transmits torque to the planetary carrier while pushing on the No. 4. clutch plate. The planetary carrier transmits this torque to the ring gear from the center differential case via the No. 1. clutch plate.

   • The ring gear outputs torque while pushing on the No. 1. clutch plate.

   • These LSD functions change the torque distribution.

   

   *1	No. 1 Clutch Plate	*2	No. 4 Clutch Plate
   *a	Input Torque	*b	Pushing on the No. 1 Clutch plate
   *c	Pushing on the No. 4 Clutch plate	*d	Rear Output Torque
   *e	Front Output Torque	-	-

   Figure 2. Torque Transmission Path

   

Rear Wheel Skid Driving Operation

1. During rear wheel skid driving (front wheel speed < rear wheel speed), when a rotational difference exists between the sun gear and the ring gear, the torque distribution of the driving force (torque) that is input by the differential case changes instantly before the torque is transmitted, as follows:

   
   

   • The ring gear transmits torque to the center differential case while pushing the No. 1. clutch plate The differential case transmits this torque from the planetary carrier to the sun gear via the No. 4. clutch plate.

   • The sun gear outputs torque while pushing on the No. 4. clutch plate.

   • These LSD functions change the torque distribution.

   

   *1	No. 1 Clutch Plate	*2	No. 4 Clutch Plate
   *a	Input Torque	*b	Pushing on the No. 1 Clutch plate
   *c	Pushing on the No. 4 Clutch plate	*d	Rear Output Torque
   *e	Front Output Torque	-	-

   Figure 3. Torque Transmission Path

   

Drive Mechanism for H4-L4 Switching

1. The drive mechanism for H4-L4 switching consists a H-L shift motor, limit switch, transfer neutral position switch, wait mechanism (spiral spring), and H-L shift fork shaft. This drive mechanism cannot be disassembled.

2. The limit switch has three contact points and detects the shift motor position.

3. The wait mechanism (spiral spring) is used for shift fork shaft operations. If the operating resistance of the shift fork shaft is high, the shift rotation is partially stored in the spiral spring. Afterward, when the operating resistance is reduced, the spring force causes the shift fork to slide.

   

   *1	Transfer Neutral Position Switch	*2	H-L Shift Motor
   *3	H-L Shift Fork Shaft	*4	Limit Switch (HL1, HL2, HL3)
   *a	Wait Mechanism (Spiral Spring)	-	-

   Figure 4. Combination of 3 Contact Point Switches

   

   *1	OFF
   *2	ON

Drive Mechanism for Free-Lock Switching

1. The drive mechanism for free-lock switching consists of a center differential lock shift motor, limit switch, center differential lock position switch, wait mechanism (spiral spring), center differential lock shift fork shaft, and actuator temperature sensor*. This drive mechanism cannot be disassembled.

2. The limit switch has three contact points and detects the shift motor position.

3. The wait mechanism (spiral spring) is used for shift fork shaft operations. If the operating resistance of the shift fork shaft is high, the shift rotation is partially stored in the spiral spring. Afterward, when the operating resistance is reduced, the spring force causes the shift fork to slide.

4. An actuator temperature sensor is provided on the shift actuator in order to allow an increase of the amount of current applied to the shift motors, and improves switching performance at low temperatures.*

   Tech Tips

   *: Models for Russia

   

   *A	Models for Russia	-	-
   *1	Center Diff. Lock Position Switch	*2	Actuator Temperature Sensor
   *3	Center Diff. Lock Shift Motor	*4	Limit Switch (TL1, TL2, TL3)
   *5	Center Diff. Lock Shift Fork Shaft	-	-
   *a	Wait Mechanism (Spiral Spring)	-	-

   Figure 5. Combination of 3 Contact Point Switches

   

   *1	Free
   *2	Lock
   *3	OFF
   *4	ON