| 摘要 |
A caster wheel for a transportation vehicles comprises an axle assembly, a core, a polyurethane tread, and an elastomeric infill, interposed between an aluminum core and a polyurethane tread. The wheel is manufactured by a multi-stage injection molding or liquid cast process, in which the tread and core are formed separately by injection or liquid cast molding, located in a mold, whilst the elastomeric infill is molded between them. A mechanical interlock is achieved directly between the tread and the elastomeric infill of the aluminum core, whilst the core and the infill are directly mechanically and chemically bonded. The invention wheel cores have oblong slots to let the liquid cast polyurethane flow through and create a strong mechanical and chemical bond. Thus a method of manufacturing forming a relatively rigid core part, forming a ground engaging tread, and molding an elastomeric infill between the core and the tread. Conveniently the core and the elastomeric infill are directly chemically bonded, whilst preferably the ground engaging tread and the infill are directly mechanically interlocked. |
