5D2-14 TRANSFER CASE - TOD FUNCTION DESCRIPTION TOD SYSTEM SELECT MODE COMPONENT FUNCTION 4H is the mode when drive normally of which gear ratio is 1 : 1 and 4L mode distributes power to front and rear wheels 50 : 50 of which gear ratio is 2.48 : 1. Shift Motor It locates backside transfer case, which drives rotary helical cam. When mode select switch changes to 4L, shift fork is on position for 2.48:1 by rotation of helical cam. Transfer Case TOD transfer case distributes power into front and rear axle by operation of 4H/4L switch and shift motor.
Shifting 4H to 4L, is performed towards reducing HI- LO collar by means for connection HI-LO shift fork with output shaft in order to join with planetary gear. Torque transmits input shaft then sun gear rotating front planetary gear. Front planetary gear join with output shaft and drives LO position. TOD Control Unit TOD system controls clutch mechanism to comply with rotation in front and rear propeller shaft and if its difference exceeds the permissible range, corresponding power is distributed into front wheel through EMC (Electro-Magnetic Clutch). Hall effect sensor signals speed on front and rear propeller shafts going through with TOD control unit.
Transfer case clutch coil is activated by variable current on exceeding difference of speed in front and rear propeller shafts. TOD control unit is located on the floor under the driver seat. Select 4L Mode When select 4L mode, EMC is locked to apply maximum torque into front and rear propeller shafts. Shift motor rotates also 4L position by rotation of cam thus propeller shaft torque changes from 1 : 1 to 2.48 : 1 by planetary gear set. YAD5D070 Shape and function of TOD Control Unit Deselect 4L Mode When select 4H mode, the 4WD mode is deselected and returns the 4WD - high speed mode. • “4H” switch : Slef-return Type • “4L” switch : Push Lock Type YAD5D080 SSANGYONG Y200 YAD5D060