March
3 April 2007
The previous edition of the SKF General Catalogue was originally published in 1989. Since that time it has been translated into 16 languages and over 1 million copies have been distributed worldwide.
In many cases, one of the principal dimensions of a bearing - the bore diameter - is predeterminated by the machine´s design and the shaft diameter.
The magnitude of the load is one of the factors that usually determines the size of the bearing to be used. Generally, roller bearings are able to support heavier loads than similar sized ball bearing
All of these bearings permit axial displacement of the shaft with respect to the housing with the bearing. Values for the permissible axial displacement within the bearing are given in the relevant pr
The diagrams are drawn for typical values and safety factors of the type normally associated with fatigue load limits for other mechanical components
The effectiveness of the lubricant is primarily determined by the degree of surface separation between the rolling contact surfaces. If an adequate lubricant film is to be formed, the lubricant must h
For belt drives it is necessary to take into account the effective belt pull (circumferential force), which is dependent on the transmitted torque, when calculating bearing loads. The belt pull must b
In order to provide satisfactory operation, roller bearings must always be subjected to a given minimum load.
Static loads comprising radial and axial components must be converted into an equivalent static bearing load. This is defined as the load which, if applied, would cause the same maximum rolling elemen
The amount of friction depends on the load and several other factors, the most important of which are the bearing type and the size, the operating speed, the properties of the lubricant and quantity
The starting torque of a rolling bearing is defined as the frictional moment that must be overcome in order for the bearing to start rotating from the stationary condition.
A temperature peak may occure during initial start-up of a grease lubricated bearing. Therefore the bearing may have to be in operation for up to 10 to 20 hours before in reaches normal operating temp
It is possible to operate bearings att speeds above the reference speed if the friction within the bearing can be reduced via a lubrication system that applies accurantely measured small quantities of
In many applications bearing stiffness is of the same order as the stiffness of the surounding structure. This opens the possibility to reduce vibrations of the application by properly choosing the be
At very low speeds it is impossible for an elasto-hydrodynamic lubricant film to be built up in the contacts between the rolling elements and the raceways.
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