A wheel consists of three parts – the wheel bearing with axle material, the wheel center and the tread. The latter is the part of the wheel that comes into direct contact with the floor. The tread can be made of different materials. Different tire profiles are also used. The various properties of a wheel also affect the load-bearing capacity, running quality and rolling resistance.
The tread material
A distinction is made between hard and soft
Softer materials include rubber and polyurethane (PUR). These are extremely kind to floors and can be used in many areas. In the case of polyurethane, a distinction is also made between the cast and injection-moulded versions. Cast PUR is of higher quality, whereas injection-moulded PUR is slightly easier to manoeuvre.
The tread profile
Often tire tread has a round, flat or trapezoidal cross-section. When we compare wheels that have exactly the same properties but different profiles, we see that a change in the profile or contact area occurs when a load is applied, and this changes the starting and roll resistance. The contact area is initially larger with a trapezoidal profile than with a round profile, but smaller than with a flat profile. As the load increases, however, there is a displacement of the contact surface. In general, the smaller the contact area, the less force is required to overcome the starting and roll resistance .
With a wheel or tire, a point load, which can be very intensive, can occur due to a locking device. In order to avoid problems, here, a material with good resilience must be selected.
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TENTE Casters, Inc.
2266 Southpark Drive
Hebron KY 41048
United States
Phone: +1 859 586 5558
Email: sales.us@tente.com