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Why is the chassis noisy at low temperature?
explain:
At low temperature, the rubber energy absorbing elements of the chassis harden, and the rubber parts are forced to deform under pressure and make a "creak" sound when passing the bumpy road;
At low temperature, the oil in the shock absorber becomes viscous, too viscous oil makes the damping force of the shock absorber larger and the vibration absorption capacity of the shock absorber worse; when traveling on bumpy road, the impact of the road is more easily transmitted to the vehicle body, resulting in a stronger sense of vibration, sometimes with noise;
After cold start at low temperature, it is a normal sound when driving on bumpy road and the chassis makes occasional noise, which will not affect the normal driving of the vehicle.
Why does the car make a loud noise when passing the deceleration strip at high speed?
explain:
When the vehicle passes the deceleration belt or the road is broken at high speed, the chassis parts, especially the spring and bushing and other elastic parts will have great deformation in a very short period of time. After the spring is compressed, it will produce great resilience. In a short period of time, the spring cannot return to the state before the force is applied, and it will directly transmit the force to the vehicle body, producing a large impact sound;
In particularly poor road conditions, if the vehicle passes through at high speed, the ground clearance of the vehicle will sharply reduce, which will also cause bumper or other chassis components to bump the road surface and make a loud noise;
When the vehicle passes the deceleration strip or the road is broken at a low speed, the spring will be pressed slowly and rebound slowly, which can effectively cushion the impact of the road surface, and there will be no big "thumping" sound.
Why is there a slight sound when the steering wheel is turned to the limit?
explain:
When the steering wheel is turned to the limit position, the pressure of the hydraulic power steering system will continue to rise; when the system oil pressure reaches the set pressure relief value, the pressure relief valve on the steering oil pump will open to protect the seal of the steering system from damage; when the high-pressure high-speed liquid flows through the valve port of the pressure relief valve, it will emit noise.
To reduce the risk of damage to the steering system, it is recommended that the steering wheel stay in the limit position for no more than 5 seconds.
Why do you need to use more force when turning in place?
explain:
When steering in place, the friction resistance between the tire and the ground is the largest. In order to ensure the stability of high-speed driving, the hydraulic power steering system cannot provide too much steering power (if it provides too much power at low speed, the steering force will be too light at high speed, reducing the stability of high-speed driving), which makes the driver feel that the steering in place is biased.
When turning in place, dry friction between the tire and the ground is easy to cause local rapid wear of the tire, resulting in poor dynamic balance of the wheel, increasing the risk of vehicle running jitter or vibration; the operation of turning in place should be avoided or reduced as far as possible.
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