Extend the life of shock absorbers

Extend the life of shock absorbers

In order to rapidly attenuate the vibration of the frame and the body and improve the ride comfort and comfort of the car, shock absorbers are generally installed on the vehicle suspension system. Currently, two-way drum shock absorbers are widely used.

Shock absorbers are vulnerable parts in the use of automobiles. The shock absorbers work well and will directly affect the smooth running of the car and the life of other parts. Therefore, we should make the shock absorbers always in a good working condition. The following methods can be used to verify that the shock absorber is working properly.

1. Make the car stop on roads with poor road conditions for 10km and then stop it. If you do not feel hot, it means there is no resistance inside the shock absorber and the shock absorber does not work. At this point, you can add appropriate lubricants, and then test, if the shell is hot, it is the lack of oil inside the shock absorber, should add enough oil; otherwise, the shock absorber failure.

2. Press the bumper firmly and release it. If the car has 2 or 3 jumps, the shock absorber is working well.

3. When the car is moving slowly and braking suddenly, if the car vibrates more violently, it indicates that there is a problem with the shock absorber.

4. Remove the shock absorber to erect it, and clamp the lower end of the connecting ring on the vise, and then pull the damping rod several times. This time, there should be a stable resistance. The upward resistance should be greater than the downward pressure. Resistance, such as unstable or no resistance, may be due to lack of oil inside the shock absorber or damage to valve parts. Repair or replacement of parts should be performed.

After determining that the shock absorber is defective or has failed, check the shock absorber for signs of oil leakage or old oil leakage.

Oil seal gaskets and gaskets were broken and damaged, and the fuel tank cap nuts were loosened. It may be the oil seal and the gasket failure. Replace the new seal. If you still can not eliminate the oil spill, you should pull out the shock absorber, if you feel there is a hairpin or different severity, and then further check the piston and cylinder bore is too large, the shock absorber piston rod is bent, the piston rod Whether the surface and cylinder are scratched or scratched.

If there is no oil leakage in the shock absorber, check the shock absorber connecting pin, connecting rod, connecting hole, rubber, bushing, etc. for damage, desoldering, cracking or falling off. If the above inspection is normal, the shock absorber should be further decomposed to check whether the clearance between the piston and the cylinder is too large, whether the cylinder is damaged, whether the valve seal is good, and whether the valve flap and the valve seat are tightly adhered or not. Whether the extension spring of the shock absorber is too soft or broken, it is repaired or replaced according to the situation.

In addition, shock absorbers may malfunction in actual use. This is mainly due to shock absorbers colliding with leaf springs, frames, or shafts, damage or detachment of rubber pads, and deformation of the shock absorber dust caps. If it is caused by lack of reasons, the cause should be ascertained and repaired.

The shock absorber shall be tested on a special test bench after performing inspection and repair. When the resistance frequency is 100±1mm, the resistance of the extension stroke and compression stroke shall meet the requirements, indicating that the shock absorber is basically normal.

The Tapered Roller Bearing belongs to the separation type bearing, and the inner and outer rings of the bearing have a conical raceway. This type of bearing is divided into single, double and four row Tapered Roller bearing according to the number of the roller. The single row tapered Roller Bearing can bear the radial load and the single direction axial load. When a bearing is subjected to a radial load, an axial force will be generated, so another bearing that can withstand the axial force of the reverse direction is needed to balance it.

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Size range
The basic dimensions of the ZWZ tapered roller bearings are listed in the size data sheet.
Single row tapered roller bearing:
Inner diameter range: 20mm ~ 1270mm
Size range of outer diameter: 40mm ~ 1465mm
Width range: 15mm to 240mm
Double row tapered roller bearing:
Inner diameter range: 38mm ~ 1560mm
Size range of outer diameter: 70mm ~ 1800mm
Width range: 50mm to 460mm
Four row tapered roller bearings:
Inner diameter range: 130mm ~ 1600mm
Size range of outer diameter: 200mm ~ 2000mm
Width range: 150mm to 1150mm
tolerance
ZWZ metric conical roller bearings have general tolerance, and also provide P6X, P6, P5, P4, P2 tolerance products, all in accordance with the GB307.1.
ZWZ taper roller bearings have general tolerance, and they can also provide CL2, CL3, CL0 and CL00 tolerance products as required.
Radial clearance
ZWZ single row tapered roller bearings only have clearance after installation, and the bearings in the opposite direction can be adjusted to determine.
Cage
The tapered roller bearings are usually stamped by steel plate and basket cage, but when the size is large, the mainstay of the solid support is also used.
1. when the bearing outer diameter of D is less than or equal to 650mm, the stamping steel cage, the cage rear code are not marked
2. when the outer diameter of the bearing is D>650mm, the steel solid pillar holder is used, and the post code of the cage is not marked.
Permissible error
Equivalent dynamic load
P=Fr KN] when Fa/Fr is less than or equal to e
P=0.4Fr +YFa [KN] when Fa/Fr>e
When a single row tapered roller bearing is used in pairs (the basic size is different), the additional axial force caused by radial load must be included when calculating the equivalent dynamic load of the bearing. The additional axial force S of a single row tapered roller bearing can be approximated by a press type calculation: S= Fr/2Y
Equivalent static load
Single row tapered roller bearing
P0=0.5Fr +Y0Fa KN]
If P0<Fr takes P0=Fr
Double and four row tapered roller bearings
P=0Fr +Y1Fa [KN] when Fa/Fr is less than or equal to e
P=0.67Fr +Y2Fa [KN] when Fa/Fr>e
Suffix definition
A: internal structure changes
B: increased contact angle
X: international standards are used in dimensions
CD: double outer ring with oil holes or oil grooves.
TD: double rings with taper hole.
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Taper Roller Bearing Sizes

Taper Roller Bearing Sizes,Taper Roller Bearing,Small Tapered Roller Bearings,Taper Roller Bearing Dimensions

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