The type of construction of the wheel bearing is of great significance for the operating properties of a castor and therefore for the mobility of the equipment. Wheel bearings must meet the most varied requirements, such as load bearing capacity, duration of use, environmental influences, resistance to impact shock, resistance to rolling, and resistance to weather, etc. We distinguish between the following wheel bearings:
Consists of an axle hole machined or moulded in the wheel centre. Usually of Cast Iron or Nylon. Suitable for light loads or where low rolling friction is not important.
The most popular low cost east movement bearing. Widely used to reduce the manual effort to move heavy loads. This type of bearing needs no adjustment on the axle.
The roller bearing consists of steel or stainless steel rollers that are positioned in a cage. These rollers roll between the axle tube and the wheel hub. Since in turning around the axle no sliding friction but rather rolling friction occurs, the resistance to rolling of the bearing is relatively low even at high loads. The roller bearing has become generally accepted as the standard solution particularly for transport equipment castors. Roller bearings are resistant, robust and, to some degree, maintenance-free.
A solid bearing consists of a bearing shell solidly connected with the wheel. It demonstrates positive characteristics. The wheel turns around the axle tube bolted to the housing. Wheels made of polyamides have gained general acceptance for castors. Solid bearings are used traditionally for transport equipment that will not be moved much. Under normal conditions solid bearings are maintenance-free and corrosion-resistant.
Flange bearings are compact, simple ball bearing units. They consist of a moulded sheet metal housing, in which balls roll between the inner and outer rings, and which has an elongated axle unit.
Precision taper bearing, metal seals and space washers. The best type for power towing applications. The axle assembly must provide for adjusting the bearing cones.
Precision bearings with a spacer in between. Gives very low friction. Shielded to retain the grease and exclude grit. Inner bearing races need to be clamped endwise on assembly.
The deep-groove ball bearing, also called precision ball bearing, consists of balls that run between a tempered inside and an outside ring. Even under extreme loads and at high speeds this bearing demonstrates very good operating properties. It meets the most stringent demands for load bearing capacity, resistance to environmental influences and easy running. Due to sealed bearings life-long lubrication can be guaranteed even under extreme environmental conditions. The single-row deepgroove ball bearing is the standard for the area of technically demanding equipment and heavy load castors.
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