Pumbaa electric heavy-duty truck dump truck chassis

Standardized, modular design
To meet the matching of various body bodies, with a large power system, to meet the power needs of various working conditions

1.Steering System​

Similar to conventional vehicles, the steering system in EVs controls the vehicle’s direction. It typically includes components such as the steering wheel, steering column, steering gear (e.g., electric power steering system, EPS), steering gear mechanism, and tie rods. EV steering systems feature a higher degree of electrification, often employing electric power assistance to enhance steering response and energy efficiency.

2.Braking System​

In addition to conventional friction braking (hydraulic disc or drum brakes), EV braking systems incorporate energy recovery capabilities. Through regenerative braking systems (e.g., Brake Energy Regeneration, BSR), kinetic energy generated during deceleration or braking is converted into electrical energy and fed back into the battery pack, improving energy utilization. Furthermore, EVs are typically equipped with advanced driver-assistance systems (e.g., ESP) to enhance driving safety.

3.Suspension System​

The suspension system in EVs comprises components such as springs, shock absorbers, stabilizer bars, and control arms. Its design aims to ensure ride smoothness, handling stability, and passenger comfort. Suspension design may be optimized based on the unique weight distribution of EVs (e.g., battery pack placement) to balance front-rear axle loads, reduce unsprung mass, and enhance overall performance.

4.Electric Drive System​

The electric drive system includes:

·Power Electronic Controller (PEC)​: Manages motor operation parameters such as voltage, current, and speed, and facilitates communication with the Battery Management System (BMS) and other onboard systems.

·Electric Motor: Replaces the internal combustion engine as the power source, typically using permanent magnet synchronous motors (PMSM) or asynchronous AC motors (ASM). The motor converts electrical energy into mechanical energy to directly drive the wheels or indirectly drive them through transmissions like reducers.

·Mechanical Transmission System: Includes single-speed transmissions, reducers, and differentials to adapt motor torque for the wheels, achieving appropriate speed and torque conversion. EVs often use simple, efficient single-speed transmissions to reduce energy consumption and system complexity.

·Driven Wheels: Directly receive power from the motor to propel the vehicle.

5.Main Energy System (Electric Source)

The battery pack serves as the EV’s power source, storing electrical energy and supplying it to the electric drive system as needed. Typically located at the bottom or specific areas of the chassis, the battery pack optimizes vehicle center of gravity distribution and interior space layout.

6.Energy Management System​

Responsible for monitoring battery status, controlling charging/discharging processes, and optimizing energy distribution and recovery strategies to ensure battery lifespan and driving range. The energy management system works closely with the power electronic controller to guarantee efficient and safe operation of the entire electric drive system.

This integrated system enhances power transmission efficiency, reduces vehicle mass, and facilitates balanced power distribution, thereby maximizing space utilization. Notably, compared to traditional internal combustion engines, motor control presents greater complexity and challenges.

To address the shortage of non-renewable energy and meet environmental protection requirements, the development of EVs is imperative. As a critical component of vehicles, EV chassis design should adopt innovative approaches, optimize upon modern automotive foundations, shorten development cycles, and reduce costs. This approach minimizes development risks and enables scalable production.