laminated rubber bearing

Deep groove ball bearing with seals or shields

Single row deep groove ball bearings with seals or shields are particularly versatile, have low friction and are optimized for low noise and low vibration, which enables high rotational speeds. They accommodate radial and axial loads in both directions, are easy to mount, and require less maintenance than many other bearing types. The integral sealing can significantly prolong bearing service life because it keeps lubricant in the bearings and contaminants out.Integral sea

ling prolongs bearing service life

Simple, versatile and robust design

Low friction and high-speed capability

Accommodate radial and axial loads in both directions

Require little maintenance

Knowledge and introduction of bearings    :                                                                                                 

Laminated rubber bearings are a type of seismic isolation bearing widely used in various structures, including bridges and buildings, to provide resistance against seismic activities and other vibrations. Here is a detailed introduction to laminated rubber bearings:

1. Functionality and Applications:

• Laminated rubber bearings are used to isolate structures from the effects of earthquakes and other vibrations. They are particularly common in small to medium-span highway bridges in China and are considered quasi-isolation systems .

• They are designed to sustain large vertical dead-loads and accommodate lateral movement of superstructures, providing resistance during seismic events .

2. Design and Construction:

• These bearings consist of alternate layers of unfilled rubbers and steel shims, which offer less flexibility and small damping. They are used to sustain thermal movement, the effect of pre-stressing, and creep and shrinkage of superstructures .

• High damping rubber bearings (HDRB) and lead rubber bearings (LRB) are two types of laminated rubber bearings with enhanced damping properties. The LRB inserts lead plugs down the center of the rubber bearing to enhance hysteretic damping .

3. Mechanical Properties:

• Laminated rubber bearings exhibit nonlinear rate-dependent hysteretic properties, which are crucial for the seismic response of base-isolated structures .

• They have the capacity to balance energy dissipation and recentering capacities during earthquakes, with a sliding-shear collaborative working mechanism under seismic loads .

4. Performance Under Load:

• Laminated rubber bearings have been found to exhibit consistently stable performance in isolating vertical vibrations, with vertical static stiffness and time history response being key characteristics .

• They are tested under various compressive stresses to examine their static and dynamic characteristics, including vertical hysteresis curves and frequency spectrum .

5. Innovations and Enhancements:

• Recent developments include sliding-controllable laminated rubber bearings (SC-LRB), which integrate shear-deforming behavior with frictional sliding behavior to improve seismic performance .

• These innovations aim to address vulnerabilities such as excessive displacement in unbonded bearings and proneness to fracture in bonded bearings during large earthquakes .

6. Numerical Analysis and Simulation:

• Numerical simulations of structures equipped with laminated rubber bearings confirm their excellent performance in isolating both metro-induced vibrations and structure-borne noise .

• These simulations help evaluate the vertical vibration isolation performance and structure-borne noise isolation capability of the bearings .

7. Maintenance and Durability:

• Laminated rubber bearings require regular inspection and maintenance to ensure their longevity and performance, especially in critical applications like seismic isolation .

8. Conclusion:

• Laminated rubber bearings are an economical and effective solution for seismic isolation, with the potential to mitigate metro-induced vibrations and enhance the seismic resilience of structures .

Laminated rubber bearings play a vital role in structural engineering, providing a reliable means of vibration and seismic isolation to protect infrastructure and ensure the safety and integrity of buildings and bridges.

For further details on this product please directly contact our sales department under shh@dmsw.com 

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