Release time : 2015-06-10 07:15:01
The universal wheels are widely used, for example trolleys we often see and use in logistics centers or supermarkets. Two front wheels of the trolley are fixed. Two back wheels are universal wheels which are close to the handle and can move.
The bearings of universal wheels determine the performance of universal wheels, which is one thing purchasers must be familiar with. Without bearings, casters will lose their value. Below is how to choose universal wheel bearings.
The ideal bearings should be suitable for the applied environment and retain necessary safety margin. When choosing, we should firstly consider its loads and calculate load capacity and suitable bearing structure.
We calculate the load capacity of a single wheel or universal wheel as follows:
T means the load weight of the single wheel or universal wheel.
E means its own weight of the transport equipment.
Z means the largest load.
M means the quantity of single and universal wheels.
N means the safety parameter (about 1.3 to 1.5).
The universal wheel uses many kinds of bearings. According to different using environments, requirements to bearings are also various. For example:
Medical casters should meet hospitals' demands including light operation, flexible steering, good flexibility, ultra quiet, wear resistance, anti-winding and good erosion resistance.
Industrial casters need to have good impact resistance and intensity. Casters used in the supermarket should meet the removable demands of supermarket shelves and portable and flexible character of shopping carts. Furniture casters should meet the furniture's demands of low center of gravity and higher loading ability. All examples show using environment is crucial to the chosen of bearings.
In addition, it is necessary to know about all kinds of bearings.
Firstly, tapered bearings. Tapered bearings are the most important components of roller bearings. The special advantage is that they expand the field of application and have the improved moving characteristic.
Secondly, roller bearings. Besides wear-resistance and deep groove roller bearings, these kinds of solid and vibration resistance bearings mainly used in casters of transport equipments. They are known for low installation height and relatively low rolling resistance and huge loads.
Thirdly, precise ball bearings. Wheels with ball bearings still remain very low rolling resistance when they bear the maximum loads.
Fourthly, common bearings. The simplest form of wheel bearings is sliding or friction. They are anti-shake and rarely need maintenance. Because of materials' properties, they can also resist corrosion and move under shot distances and low rotation speed.
There is no best, only the most suitable. Lily bearing recommends users compare bearings of different companies according to their own real situation so that they can find suitable universal wheel bearings.