Date: 2013-08-20

NSK bearing load classification with its sealed surface selection requirements

1. turn the load
Role in the synthesis of radial loads on the rings along the Raceway circumference rotate, turn to various parts of the bear, this referred to as rotating loads.
(1) the loading fixed, unchanging, ring spinning. (2) load vector rotation, and still rings. (3) load vector and the rings rotate at different speeds.
2. fixed load
Role in the synthesis of radial loads on the rings, shouldered by the Raceway of the local area and the relative to the axis, or NSK bearings, this is called a fixed loads. Fixed loading is characterized by relatively static radial load vector synthesis with ring. Ferrule and synthetic radial loaddoes not rotate or rotate at the same speed it is of a constant load. Bear fixed load rings can choose more cooperation.
3 swing and variable loads
Orientation of the sometimes load and size cannot be accurately determined that in addition to bear the weight of rotor direction fixed loads of patrons, there are imbalances arising out of the quality of rotating load, if such a rotating load much larger than a fixed load, its synthesis is still rotating loads; and if you rotate load much smaller than a fixed load, synthesis for swinging loads.
II: sealing surface of cylindrical roller bearing selection requirements:
1. There should be a certain degree of hardness, hardness and working under temperature dropped under.
2. resistant to erosion: "Washout" medium flows through the sealing surface at high speed, the sealing surface of the destruction process. This destruction in high temperature and high pressure steam throttle valve, safety valve used in the media is more obvious, damage to the sealing effect is large, therefore, resistant to erosion is one of the important requirements seal the surface material.
3. scratch resistance: "Scotch" is relative motion in the process of sealing surface, material damage by friction. This corruption will surely cause damage of sealing surface and, therefore, must have good abrasion resistance performance of sealing surface material, particularly valves. Of the scratch resistance of the material is often determined by the internal nature of the material.
4. the sealing surface and bulk material of linear expansion coefficient should be approximation, the inserted sealing ring structure is more important, exposed to additional stress to avoid high temperature and causing loose.

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