Ⅲ. Construction, principle, adjustment and maintenance of
electric forklift truck
1. Transmission system
1.1 General description
The transmission system consists of a gear box assembly, differential assembly and
drive axle. With direct connection of the drive gear and the drive motor, the travel speed of
the truck can be changed with rotating speed of the motor, and the travel direction can be
changed with the rotation direction of the motor.
(1) Gear box and differential
Gear box is located between the drive axle and drive motor. This device is utilized to
reduce rotating speed of output shaft of drive motor, increase the torque transmitted from
output shaft and then transmit the torque to the differential. Refer to Fig1-1(1.5t),
Fig1-2(2-3t).
The differential is fitted on the front portion of reducer housing with two end bearing
seats, the front end of the differential is connected with the axle housing. The differential
case is of splitting type, with two half-shaft gears and four planet gears. Refer to Fig1-3.
(2) Drive axle
The driving axle assembled on the front of frame mainly consists of housing,
wheel-hubs and wheels. The axle housing is of integrally casting construction. The tyre
with rim is fixed to the hub with stubs and nuts. The power is transmitted through the
differential to the half-shafts, which drives the front wheels through the hubs. Each hub is
fixed on the axle housing with conical roller bearing, so that the half-shafts bear only the
torque transmitted to the hubs. There are oil seals inside the hub to prevent the entering
of water and dust or leaking of oil. Refer to Fig1-4.
The type of front tyre and rim and the pressure of front tyre is indicated in following
table.
Notice：For the difference of manufacturer＇s standard, charge the tyre pressure
according to the actual tyres.
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