Tuning of the shock absorber
In recent years, with the rise of the auto research and development wave in China, many manufacturers have started the attempt to tuning the shock absorber, because the tuning of the components are more, the cumulative tolerance of the product assembly and the design components is error, so it must be tuninged. The components needed to be tuninged include the diameter of the front and rear stabilizer rods, the stiffness of the front and rear springs, the damper damping and the stiffness of the bushing. The shock absorber calibration is very important in chassis adjustment. It not only directly affects ride comfort, but also affects vehicle handling and stability.
The control stability and comfort of the automobile are two opposite unity. With the improvement of the vehicle operating performance, the comfort is generally reduced. How to find a balance between the two is the key to the design of the automobile chassis. The tuning is to optimize and match the performance of hard point, spring stiffness, stable rod stiffness, damper damping, bushing and steering system, so as to make the optimal distribution of control and comfort, and meet the design requirements to the maximum. Nowadays, the method of chassis adjustment has developed from theoretical calculation and real car evaluation, which has developed into a combination of virtual simulation and K&C test, subjective evaluation and objective evaluation. When the performance of the vehicle is in conformity with the performance of the competitive vehicle, the vehicle performance of the target vehicle with the chassis can reach or close to the competitive vehicle.
The function of the shock absorber is to quickly attenuate the vibration between the body and the wheels caused by the impact of the pavement, and ensure the grip of the wheels to ensure the handling performance and comfort of the car. The determination of the new model damper is generally based on the calculation of the whole vehicle parameters, and the preliminary scheme is determined according to the performance test of the competitive model shock absorber. The final scheme is to carry out the chassis with the other parts of the chassis while adjusting the chassis. At present, the production technology of shock absorber in China is relatively mature. As long as the performance curve of shock absorber is determined, the general professional shock absorber manufacturers can meet the requirements of design and manufacture.
There are many parts and components involved in the adjustment of chassis. The means and methods are very systematic and complex.
The importance of adjusting the shock absorber
The actual operating conditions of the vehicle are varied. For example, the suspension is first subjected to the horizontal impact and the longitudinal impact is subjected to the high speed reduction roadblock. The longitudinal impact is mainly borne when the pit is over. At the same time, the impact of the high speed and low speed is different. This requires that the damping force of the damper at all rates should be suitable. Cargo vehicles and even general buses are not very high in control and comfort requirements. The requirements for shock absorbers are mainly determined by theoretical calculation, reference to similar model parameters and simple tests. But for the car or SUV, it also has high requirements for comfort while meeting control and for the pursuit of driving. Driving fun, may often encounter high speed turning, emergency avoidance and other actions, for this kind of vehicle with higher control and comfort requirements, it is particularly important to adjust the shock absorber.
Adjusting method and process of shock absorber
The internal structure of the shock absorber is relatively simple, mainly composed of a compression seat, a compression throttle slice, a piston valve, a piston rod, a restoring valve piece, a working cylinder and an oil seal. The formation of damping force is the force of the valve opening at the time when the liquid flows through the piston hole. The size of the throttle valve opening mainly affects the damping force (less than 0.2 m/s) at low speed, and the stiffness of the valve plate is mainly affected by the damping force (0.2 ~ 0.6 m/s) at the medium speed, while the live plug hole mainly affects the damping force of high speed (above 0.6 m/s), so the size and quantity of the valve plate and the piston hole are the key to the damping force. Factor。In order to reflect the correction results most truly, the specification tolerance of each valve plate should be strictly controlled. As the combination of each valve piece is varied, each combination can get different performance curves. To get the final performance, it needs to be repeatedly tested and repeated, so the vibration damper is adjusted to the chassis adjustment. The process of school is quite complex.
When we adjust the vehicle to adjust the vehicle, because there are many plans for the damper, it will cause huge waste if we do a set of shock absorbers according to each scheme. Therefore, when adjusting the shock absorber, it is necessary to prepare the corresponding equipment first, generally for the vibration damper to adjust the service car, including the performance test bench and the adjustable damper, of course, It is also necessary to test the pavement with different effects. The cylinder body and the upper cover can be disassembled conveniently through the thread. At the same time, the performance curves of different combinations can be obtained in time by the test bench, and the loading test can be carried out until the satisfactory results are obtained.
CIJAN has its own adjusting car for the shock adsorber. We can do the test at spot given by the customer to show the test method, test report and test reliability and so on.