Moving Components

technical guide // determining factor The load-carrying capacities for wheels, castors and rollers that are specified in this catalog are valid for driving speeds up to 4 km/h when used on even, smooth surfaces at ambient temperatures between +10°C and +30°C. All dimensions, load-carrying capacities, tolerances, and true running accuracies correspond to the following standards: EN 12527 – 12533, DIN 7845. Please also observe the prohibition symbols. The load-carrying capacities are valid at driving speeds of 4 km/h on even surfaces. The load-carrying capacities that are specified for rollers, castors and wheels in this catalog are static-dynamic load values. 4. Type of usage and duration Your application type and the length of time a wheel, roller or castor will be used are the criteria for selecting the proper bearing type. Wheel bearings can be either: plain bearings, roller bearings or ball bearings. 5. Starting and rolling resistances The starting and rolling resistances are determined by the force required to move a vehicle. These resistances are dependent on the wheel material, the wheel diameter, the nature of the tread, the bearing element, and the load. The larger the wheel diameter, the lower the rolling resistance. Wheels with polyamide and polyurethane tire treads attain the lowest starting and rolling resistances on even surfaces. 6. Technical note We reserve the right to make technical changes. Caution: Mixtures of chemicals can have completely different influences than the data specified in the table. We accept no legal liability. Temperature resistance The functionality of a wheel or castor also depends on the influence of temperature. The temperature specifications for the treads are derived from the interaction of the ambient temperature and the heat caused by flexing. If plastic wheels, rims, or wheel bodies are being used, then temperature influences must be considered when selecting the proper material and bearing type. The load-carrying capacity and degree of stability are affected by cooling and heating. The load-carrying capacity and the service life of treads decrease significantly at higher temperatures; this is why special treads and wheel materials have been developed for use at higher temperatures. 3. Load-carrying capacity Use the following formula to calculate the load-carrying capacity for the product you have selected: Total weight of the equipment (= weight + payload) divided by 3 (often only three of four wheels have contact with the ground on uneven surfaces). Driving over obstacles can also cause temporary overloading. Weight of the equipment + absolute maximum payload 3 required load per castor when using 4 castors = The required load capacity can be calculated using the following formula: 11

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