polyurethane bearing locking

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    :                                                                                                 

Polyurethane bearing locking refers to the use of polyurethane materials in the construction of locking mechanisms for bearings, particularly in the context of bridge engineering applications. Here's a detailed introduction based on the provided search results:

What Are Polyurethane Bearing Lockings?

Polyurethane bearing lockings are components used in bridge engineering to provide high friction and locking capabilities to bearings. These lockings are typically made from high friction polyurethane (HFPU), a material that has gained significant attention due to its superior mechanical properties and castable nature, making it highly suitable for modern bridge bearing development .

Advantages of Polyurethane Bearing Lockings

1. Superior Mechanical Properties: Polyurethane elastomers (PUE) offer excellent mechanical properties, including high elongation capacity, strength, impact resistance, and thermal stability .

2. High Friction: HFPU bearings demonstrate an effective contact interface with bridges and bedding stones, providing high friction behavior which is crucial for seismic isolation and load distribution .

3. Reduced Size with Maintained Capacity: HFPU bearings can offer the same vertical load-bearing capacity as traditional rubber bearings but with a reduced size, which is particularly advantageous in constrained construction spaces .

4. Energy Dissipation: HFPU bearings have energy dissipation capabilities, which are essential for seismic isolation applications .

Applications

Polyurethane bearing lockings are used in various applications, including:

• Bridge Engineering: They are used in bridge bearings to accommodate high traffic loads and provide structural reinforcement .

• Seismic Isolation: HFPU bearings are used in seismic isolation applications to improve structural safety during earthquakes .

Material Characteristics

The properties of polyurethane elastomers are significantly influenced by the composition of the synthesized material and the fabrication process. HFPU, for instance, is fabricated using a laminated casting process with steel plates, which reduces the bolted interface commonly found in traditional polyurethane seismic isolation bearings . The chemical composition of HFPU includes poly ε-caprolactone (PCL-210 N), 2,4-toluene diisocyanate (TDI-100), 3,3-dichloro-4,4-diaminodiphenylmethane (MOCA), and organic silicone diol (OSD) .

Mechanical Properties and Testing

The mechanical properties of HFPU, including hardness, tensile, compression, and shear characteristics, are evaluated through various tests. HFPU bearings are tested for both vertical and horizontal performance, and their hysteresis curves under 100% strain shear are validated using the Bouc-Wen model. The high friction behavior of the HFPU bearing is investigated using the Dahl model and the Bouc-Wen model .

Conclusion

Polyurethane bearing lockings, specifically HFPU bearings, offer a viable alternative to traditional rubber bearings in bridge expansion projects, particularly in regions with high traffic volumes and constrained construction spaces. They provide a combination of high friction, reduced size, and maintained vertical load-bearing capacity, along with energy dissipation capabilities, making them an excellent choice for seismic isolation and structural reinforcement in bridge engineering applications .

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