BLICKLE - wheels and castors Page 49
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Wheels and castors guide Blickle wheel series info box Starting, rolling and swivel resistance. Wear resistance. Starting, rolling and swivel resistance Starting resistance reflects the amount of force required to get the wheel in motion when it is at a standstill. Rolling resistance refers to the amount of force required to keep the wheel moving in a uniform manner. Starting and rolling resistance are affected by the following factors: • • • • • • wheel diameter tread geometry tread & tyre hardness rebound resilience of the tread wheel bearing surface Rolling resistance occurs as a result of the constant compression and decompression of the tread while the wheel is rolling (hysteresis). Rolling resistance is measured using a test bench. Measurements are taken under ideal conditions: • level, smooth, steel surface free of dirt and obstacles • speed: 4 km/h • temperature: +20 °C • load: ⅔ of max. load capacity Swivel resistance is the amount of force required to align the castors in the direction of travel. Material Rolling resistance Pneumatic tyre / soft rubber Swivel resistance is affected by the following factors: 1. Contact area of the wheel: The contact area of the wheel rotates around its centre when the swivel castor turns. This causes friction. The resistance is dependent on the interaction between the surface and the wheel tread, in addition to the size of the contact area. 2. Resistance of the swivel head: The structure and quality of the swivel head have an impact on its swivel resistance. 3. Offset of the swivel castor: The swivel resistance of the swivel castor is influenced by the distance between the centre of the swivel head and the centre of the contact area. Elastic solid rubber Super-elastic solid rubber Standard solid rubber Thermoplastic polyurethane (TPU), soft Thermoplastic rubber-elastomer (TPE) Polyurethane 75 Shore A (Softhane®) ® Polyurethane 75 Shore A (Besthane Soft) Polyurethane 92 Shore A (Extrathane®) Polyurethane 92 Shore A (Besthane®) Thermoplastic polyurethane (TPU), hard Polypropylene / nylon Cast nylon Cast iron / steel ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ good very good good satisfactory very good very good very good excellent very good excellent very good excellent excellent excellent These standardised conditions make it possible to compare the rolling resistances of different wheel series. Different application conditions (surface quality, temperature, speed, etc.) must be taken into consideration when designing the running gear and can have a significant impact on rolling resistance. Wear resistance The higher the point score in this category, the greater the wear resistance of the wheel. Material Pneumatic tyre / soft rubber In addition to other factors, the wear resistance incorporates the resistance to abrasion of elastomers or thermoplastic elastomers in accordance with ISO 4649. The resistance of other tread materials to abrasion was tested in accordance with ISO 4649. Elastic solid rubber Tread materials are assigned to different abrasion resistance categories in the graphic to the right. Thermoplastic rubber-elastomer (TPE) Super-elastic solid rubber Standard solid rubber Thermoplastic polyurethane (TPU), soft Polyurethane 75 Shore A Polyurethane 92 Shore A Thermoplastic polyurethane (TPU), hard Polypropylene Nylon Cast nylon Cast iron / steel www.blickle.com Wear resistance ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ ■■■■■ satisfactory good good sufficient good satisfactory very good excellent very good satisfactory good very good excellent we innovate mobility 49
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