What is the function of the rear shock absorber core of a car
The rear shock absorber core of a car is a key component of the suspension system. Its main functions include:
Buffer road surface impact
The energy generated during spring compression is converted into heat energy through hydraulic or gas damping to reduce vehicle body bouncing.
Suppress spring rebound
Increase resistance during the spring's extension stroke to slow down its rebound speed and maintain the stability of the vehicle body.
Improve driving stability
Reduce the vehicle body shaking caused by bumps, especially maintaining the balance of the rear posture when cornering and braking.
Extend the service life of components
Reduce the impact force on the chassis components to lower the risk of wear and loosening.
If the shock absorber is damaged, it will cause problems such as increased vehicle jolting and reduced handling stability. It needs to be replaced in time (it is recommended to check it every 50,000 to 100,000 kilometers).
The common types and causes of abnormal noises from automotive shock absorber cores are as follows:
Types and causes of abnormal noises
Youdaoplaceholder0 metal friction sound
Oil leakage from the shock absorber or loss of internal hydraulic oil can cause the piston rod to rust or bend, and the direct friction of metal parts can produce abnormal sounds such as "creaking" and "clanging".
Long-term storage causes the oil seal grease to dry out. The low temperature in winter reduces the fluidity of the hydraulic oil and grease, intensifying friction.
Youdaoplaceholder0 the aging sound of rubber parts
The aging of rubber parts such as the top rubber and buffer blocks (with a service life of about 5 to 8 years) will produce squeezing sounds, such as the "clicking" sound when turning the direction in place.
Wear of the rubber sleeves of the balance bar and the lower control arm will cause an increase in the suspension clearance, resulting in a "clank" sound when crossing obstacles.
Youdaoplaceholder0 Abnormal sound of the valve body
Damage to the internal valve body or bending of the ejrod can damage the structure of the hydraulic system, generating a "thump thump" metallic knocking sound.
Abnormal noises in special scenarios
When driving at high speed, a "buzzing" resonance sound may occur, which is mostly caused by not tightening the top screws of the tower according to the standard torque (60-80N·m) after replacing the shock absorber.
It is recommended to promptly check for any abnormal noise through the following methods:
Youdaoplaceholder0 Static inspection : Observe whether the shock absorber has oil leakage, the dust cover is damaged or the top rubber is cracked; Press the vehicle body to observe the number of rebounds (normal 1-2 times).
Youdaoplaceholder0 dynamic test : Pass over speed bumps at 10-20km/h to confirm the location and sound characteristics of the abnormal noise.
The core of automotive shock absorbers mainly uses carbon spring steel , and in some high-performance scenarios, alloy spring steel (such as 80CrV2 or 48Si7) is used to ensure high elasticity, fatigue resistance and durability.
Material types and properties
The core material of the shock absorber core needs to withstand alternating loads and impacts. Common steel materials include:
Youdaoplaceholder0 carbon spring steel : mainly high-carbon steels such as 65Mn and 70#, with tensile strength ≥1600MPa, low cost and easy to process, widely used in economy vehicles.
Alloy spring steel : performance is enhanced by adding elements such as chromium, vanadium and silicon:
80CrV2 (chromium-vanadium steel) : Elastic recovery rate ≥97%, strong aging resistance, spring height reduction of only 0.8mm after 100,000 kilometers of driving, suitable for high-end vehicle models.
48Si7 (silicon steel) : It features a high elastic limit, long fatigue life, and can withstand alternating loads of over 500N.
Advantages and Applications
Youdaoplaceholder0 Performance advantages : Carbon spring steel provides basic strength and durability; Alloy spring steel is superior in terms of elastic recovery, corrosion resistance and fatigue resistance. For instance, the rust resistance of 80CrV2 has been enhanced by three times, and the noise is stable at 62 decibels.
Youdaoplaceholder0 application scenario : carbon spring steel is used in ordinary shock absorbers; Alloy spring steel is used in high-performance or harsh environments (such as luxury car suspensions), which can extend the replacement cycle to 250,000 kilometers.
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