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Ⅲ. Construction, principle, adjustment and maintenance of
forklift trucks
1. Drive system
1.1 General description
The drive system consists of general transmission system and partial brake system.
With the front wheel duplex motor driving construction, the right and left front wheel
separately contain drive axle, transmission case, brake unit and drive motor, which
improves the working efficiency. The reducer and the brake unit assembled in the drive
axle housing forms a unit.
The travel speed of the truck is increased with the speed of traveling motor, while the
travel direction changes with the rotation direction of traveling motor. The sensor
assembled on the rear wheel sends the information to the controller which controls the
driving motor on the front wheels, with the different information accepted, the driving motor
transfers the different rotation, then the truck can be turned. The steering of the front wheel
is come out by the electrical differential, which instead of the differential composed of bevel
gear. With the system, the efficiency can be improved and the noise when the bevel motor
drives can be eliminated.
1.1.1 Reduction box
The reduction box consists of case housing, reduction device, brake friction device,
case cover and wheel axle. The outer housing and case cover are of cast construction. The
reducer device and brake friction device are assembled in the case body which is
combined of reducer outer housing and case cover. The power is transmitted to the wheel
axle through the transmission, drawing the rotation of front wheel. The reducer is fixed on
the joint plate of frame with 7 bolts. See the construction in Fig.1-1.
The parts of the drawing:
1.Wheel axle
6.Tappered roller
bearing
11.Column pin
16.Fixed seat
21.Outer cycloid gear 22.Planet gear
26.Big bevel gear
31.Mini bevel gear
36.Input shaft
41.Washer
46.Friction piece
51.Seal ring
56.Plug
61.Drain screw
2.Bolt,drive axle
3.Sleeve
7.Housing,
8.Drain plug
reduction box
12.Retainer ring
13.Spacer
17.Screw
18.Internal gear
23.Needle bearing 24.Outer spring
27.Pin
28.Inner spring
32.Pin
33.Case cover
37.O-seal
38.Cycloid gear
42.Pin
43.Washer
47.Disk
48.Disk
52.Seal ring
53.Case cover
57.Pin
58.Seal ring
62.Spring pin
63.Column pin
4.Axle ring
9.Socket head plug
14.Spacer
19.Planet bracket
29.Bearing
34.Socket head bolt
39.Tapered pin
44.Brake friction piece
49.Sealed gasket
54.Socket head bolt
59.Brake joint
64.Brake lever
18
5.MLON-ring
10.Socket head plug
15.Inner ring
20.Nut
25.Outer spring
30.Spring
35.Ball bearing
40.Spring
45.Spring gasket
50.Piston
55.Socket head spring
60.Needle pin
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