Power Transfer Group 2 3 1 5 4 6 Power Transfer Group (1) Bevel gear (2) Differential case (3) Helical gear (4) Spiral hypoid pinion (5) Input Gear (6) Drive Motor Shaft The power transfer group is mounted under the frame in the front of the lift truck. ItXs a double reduc- tion unit with the final reduction through spiral hypoid pinion (4) and bevel gear (1). transfer group lets the inside wheel stop or turn slow- er in relation to the outside wheel. When the truck is moving straight in a forward direc- tion with the same traction under each wheel, there is equal torque on each axle.
This holds (stops) differ- ential pinion gears which give the same effect as if both wheels were on the same axle. During a turn, the force (traction) that is on the drive wheels is dif- ferent. These different forces are also felt on opposite sides of the power transfer group and cause differen- tial pinion gears to turn. The rotation of differential pinion gears stops or slows the inside wheel and lets the outside wheel go faster. This moves the machine through a turn under full power. Power for the transfer group comes from the electric drive motor through the input gear connected with the Drive Motor Shaft (6) through the spline .
The input gear (5) turns helical gear (3) that is mounted on the shaft of the hypoid pinion (4). The hypoid pinion is engaged with bevel gear (1) which is mounted to differential case (2). Differential case (2) has two pinion gears that are engaged with two side gears. The side gears turn the axle shafts. The power transfer group is used to send the power from the electric drive motor to the wheels. When one wheel turns slower than the other, the power The power transfer group gets lubrication from oil thrown about inside the housing, by the rotating gears. Power Train Systems Operation 7