Gearbox
Function of the Gearbox:
Change the Transmission Ratio: The gearbox alters the transmission ratio between the power unit and the main drive wheels, thereby changing the vehicle's traction and travel speed to meet operational and driving requirements.
Enable Reverse Operation: It allows the vehicle to move in reverse.
Disconnect Power: When the gearbox is in neutral, the power from the engine to the drive wheels is cut off, allowing the engine to start. This also enables the vehicle to remain stationary for an extended period while the engine is running.
Distribute Power: In the case of all-wheel drive, the power from the engine is distributed to both the front and rear axles through the gearbox.
Variable Speed and Torque: It allows for speed and torque adjustments (note: coasting in neutral on a downhill is prohibited).
Drive Axle
(1) Function of the Drive Axle:
The drive axle, as a major component of the chassis transmission system, primarily serves to:
Increase the torque transmitted from the engine.
Distribute torque to the left and right drive wheels while providing a differential function for both wheels.
Support various forces transmitted from the road surface and the vehicle frame.
(2) Structure of the Drive Axle:
The main components of the drive axle include:
Main Drive; Differential; Wheel-side Reducer; Brake; Axle Housing; Half Shafts
(3) Main Drive:
The main drive uses spiral bevel gears, which have a high load capacity and efficiency. Its function is to increase torque and change the direction of torque transmission.
(4) Differential:
The differential allows the drive wheels to rotate at different angular speeds when steering or traveling on uneven surfaces. It can be classified into:
Standard Differential
Limited Slip Differential
(5) Wheel-side Reducer:
The wheel-side reducer features a planetary gear structure that further increases output torque.
(6) Brake:
The brake system employs fully enclosed hydraulic wet multi-disc brakes, providing smooth and reliable braking performance suitable for harsh working environments.
Drive Shaft
(1) Function of the Drive Shaft:
The drive shaft is primarily used for power transmission between two components that have non-concentric axes or experience relative positional changes during operation.
(2) Composition of the Drive Shaft:
Also known as a universal joint drive mechanism, it typically consists of universal joints, the drive shaft itself, and intermediate supports.
(3) Universal Joint:
Universal joints can be classified into two types: elastic and rigid. Rigid universal joints reliably transmit motion even when the angle between shafts changes, and they have a high transmission efficiency.
(4) Components of the Universal Joint:
The components include a lubrication nozzle, oil seal, needle bearing, bearing housing, gasket, cross shaft, and connecting flange.
(5) Connection Method of the Drive Shaft:
The connection methods include circular flanges and spline-type connections (C-shaped flanges).
Tire and Rim
(1) Tire
Composition of the Tire:
Outer Tire; Inner Tube; Inner Liner (Casing)
Function of the Tire:
Supports the entire vehicle; Provides cushioning; Delivers driving and braking forces; Offers lateral grip
(2) Rim
Composition of the Rim:
Rim Body; Bead Seat; Lock Ring
