Automobile chassis consists of four parts: transmission system, driving system, steering system and braking system, the specific parts included are described below:
　　Transmission system: clutch, transmission, main reducer, half shafts, universal joints, drive shafts.
　　The role of each part:
　　Clutch: in order to ensure that the car starts smoothly, shift smoothly, to prevent overload in the transmission process, to prevent the impact of torsion vibration; Transmission: is used to coordinate the engine speed and wheel travelling speed, so as to make its engine performance release to the best; Main Reducer: is in order to reduce the speed of the transmission process, increase the torque of the components. Make its transmission speed down, in order to get a relatively high output torque, so as to get a greater driving force; half shaft: is also the drive shaft, make the power of the shaft; universal joints: is the control of automobile steering, belongs to the vectorial transmission of the power of the device; driveshaft: is mounted between the transmission and the rear axle, is to speak of the transmission to bring the torque and rotational power transmission to the rear axle.
　　Driving system: frame, balance bar, axle, wheel, Yuanbao beam, shock absorber, horn, arm, three-way catalytic.
　　The role of each part:
　　Frame: is used to carry the chassis of the various accessories of the framework, but also to withstand the external pressure of the protective frame; balance bar: is used to improve the car's handling performance, especially in the process of turning; axle: is used to transfer the frame and wheels brought about by the force in all directions; wheels: load-bearing and roll is his ultimate choice; Yuanbao beam: used to carry the engine and transmission, but also play a purpose of strengthening the strength of the body; Shock absorber: its role is to reduce the vibration of the frame and body, so that its vehicle smooth, safe and comfortable driving; Sheep horn: play a role in linking the steering, the link is the shock absorber and the lower swing arm; Support arm: play a role in fixing the link, used for the frame and the sheep horn of the link; Three-way catalytic: it is to exclude the exhaust gas channel. Make it into harmless carbon dioxide, water, nitrogen catalytic converter.
　　Steering system: steering shaft, steering cross tie rod.
　　The role of each part:
　　Steering shaft: increase the rotational force given by the steering wheel, so as to change the direction of the force transmission smoothly; steering cross tie bar: coordinate with the steering shaft to complete the corresponding steering work.
　　Brake system: brake disc, brake pump, brake pads.
　　The role of each part:
　　Brake disc: at the same time the role of the brake pads to make its vehicle braking, providing a friction surface only; Brake sub-pump: to provide the power top brake pads and brake disc friction and braking effect, is to give the brakes the courage of the function; Brake pads: brake disc friction with the brakes to achieve the effect of braking.
　　Chassis complexity is very high, tuning is more complicated. The chassis puts the vehicle in contact with the road and, apart from gravity and aerodynamic forces, all forces and moments are transmitted by the contact surface between the road and the tyres. The most important criterion in driving is that the connection between the vehicle and the road surface at the tyres must not be interrupted, otherwise the vehicle's manoeuvring, acceleration, braking and the transfer of lateral forces are impossible.
　　The following are some of the maintenance and fuel consumption problems of the car chassis
　　Proper front wheel front beam adjustment. Improper front beam increases the rolling resistance of the vehicle and increases fuel consumption. Regularly check the front beam value and compare it with the normal value, if the value is different, it should be adjusted.
　　Wheel bearings are well lubricated and properly adjusted. Poor wheel hub grease lubrication and improper adjustment of bearing clearance will increase driving resistance.
　　Pay attention to the changes of the front and rear axles and the frame. Front, rear axle and frame displacement or bending deformation, so that the body can not maintain vertical or horizontal, the car driving to a certain side of the deviation, the tyre and the ground sliding friction occurs, thus increasing the driving resistance, so that the fuel consumption rises significantly.
　　Chassis Strengthening Parts
　　Front wheel lower arm balance lever (original car necessary accessories also called front sway bar), designed to be installed in the front axle and front wheels of a separate connection, the main role is responsible for controlling the front wheels of the inner and outer side of the camber, see the small lateral tilt.
　　Direction of the front beam balance lever (original car necessary accessories), designed to be installed on both sides of the front wheel lower swing arm, control the direction of the front wheel of the overall symmetry. The main role is to be responsible for the front camber of the front wheels to maintain the tracking ability of the directional wheels.
　　Front shock absorber tower tower top balance bar (Hong Kong and Macao commonly known as: top bar, optional parts), designed to be installed on the front shock absorber tower tower top position, the main role is to enhance the rigidity of the nacelle and the front bodywork, offsetting centrifugal transverse torsion caused by the deformation of the frame (serious deformation can cause tower top tear), improve the vehicle's cornering ability, improve cornering speed, reduce the body by the centrifugal force produced by the angle of the sideways tilt.
　　Front bottom beam balance bar (commonly known as: front bottom bar, optional parts), designed to be installed in the front axle and frame chassis in front of the connection part, the main role is to enhance the front bottom beam (front axle) and the chassis connection strength, reduce centrifugal force and body distortion caused by the displacement of the front axle deformation, and its main role is to improve the performance of the cornering as well.
　　Rear wheel shock tower tower top balance bar (commonly known as: rear top bar, optional), designed to be installed in the rear shock tower tower top position, the main role is to enhance the strength of the rear box, reduce the rear of the compartment due to centrifugal force caused by the lateral distortion, reduce the rear of the car cornering lateral inclination, to improve the performance of the vehicle cornering.
　　Rear axle suspension enhancement balance bar (commonly known as: rear bottom bar, optional parts), designed to be installed in the rear axle and frame chassis rear connection position, the main role is to strengthen the rear axle and frame connection strength.
　　Frame (body), chassis reinforcement balance bar (component).
　　How chassis reinforcements work:
　　Under the daily environment, the vehicle is driven by the road surface external forces, will cause the body of the body distortion, this time the lower the body rigidity of the car caused by the body distortion will be greater. Low body rigidity will also cause body distortion, affecting the tyre contact surface with the ground, resulting in a decline in vehicle cornering performance and handling performance.
　　The advantage of installing chassis reinforcement is that it can pull the chassis components together, thus strengthening the body rigidity and suppressing body twist. At this time the vehicle handling feeling will be more sensitive, strengthen the body will also absorb the impact from the ground, improve comfort, vehicle driving will be more stable, but also can reduce the body aging brought about by the feeling of looseness, but also the role of the suspension to play to the extreme, so that the body of the effective dispersion of torque.