The reason why the offset is so important is that it directly determines the rotation performance and service life of the swivel caster. When other dimensions are the same, the larger the offset, the better the rotation performance of the caster. However, the contradiction is that as the offset increases, the torque generated by the load during the use of the caster also increases linearly, which will undoubtedly greatly affect the rotation life of the swivel casters; conversely, when other dimensions are the same, the smaller the offset, the safer the caster is to bear the load. Therefore, at the beginning of the design of the caster, the offset is regarded as a life dimension to be considered. When the offset of a universal wheel is determined, its performance and life are also determined. From another perspective, whether the offset is reasonable can directly explain the quality and advantages of this caster.
Calculation method of caster offset: X=1.5e(1-e/2d), where X is the thickness of the gasket, e is the offset distance of the offset workpiece, and d is the diameter of the part clamped by the claw. Large offset usually requires calculation of reinforcement, while small offset can be reinforced according to the structure, that is, the minimum reinforcement ratio is 0.2%.
As the offset increases, the corresponding bracket arm increases, the bracket is reduced accordingly, the joint contact stress is reduced, and the prosthesis wear is reduced. At the same time, the stress of the prosthesis neck is reduced, and the bracket stress of the corresponding part is reduced. In artificial hip replacement, it is necessary to restore the normal offset of the bracket to reduce the prosthesis wear. For some hip diseases with weak brackets, the offset can also be appropriately increased to restore the force arm of the abductor muscle to improve the stability of the joint.
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