The importance of bearing seals

　　　Seals for bearings is extremely important part of the sealing problem, then the bearing tightness test pressure is great
　　　Seals for bearings is extremely important part of the sealing problem, then the bearing tightness test pressure is great, especially for non-rod chamber pressure test, in the absence of tooling to withstand the pressure test, rodless chambera lot of pressure on the piston rod through the piston effect in just rely on the fuel tank of the mouth of the connection to bear is absolutely not. Therefore, it is usually this type of pressure test after the tank is carefully assembled, before entering the assembly machine commissioning phase. Will cause a great impact, if any irregular shape, lack of meat, tiny cracks, defective seals are not. However, bearing the seal test on the fuel tank after the assembly to seal parts of its junction assembly and reliability assessment. Such as sealing and connection of the fuel tank brim, the cylinder piston (rod chamber and the rod chamber) on the static seals and sealed condition.
When the fuel tank of the machine of the rack to withstand the enormous pressure, if the fuel tank assembly of good can be. The fuel tank pressure test in the assembly was very easy to not only save a separate trial after the pressure in the fuel tank assembly tooling, but also save the hours will shorten the production cycle, the production effect is very useful. If the operator is not careful inspection and careful work, then there will be the results worth the wait.
 
Therefore, in front of the assembly bearing should carefully verify the dimensional accuracy of the relevant parts of the sealing parts of the seal groove of the dimensional accuracy of ultra-poor or seal the surface roughness does not meet the requirements to make seal failure. Particular the inspection of the sealing lip, not defective seals put into the product. In addition, bearing the seal material, hardness index check control and product certification and storehouse.

The importance of bearing preload and axial adjustment
Preloading and axial adjustment is a vital but still largely misunderstood area of bearing technology. However, when applied correctly, preloading can reduce or overcome the causes of bearing vibration, heat build-up, noise and fatigue. Gary Hughes, Product Engineering Manager at The Barden Corporation, describes the pros and cons of the three primary methods of applying preload to a bearing.

Preloading and axial adjustment is a method of removing or controlling the internal clearance of a bearing. This is important because the degree of internal clearance within a bearing can influence a variety of factors, including noise, vibration, heat build-up and fatigue life. When applied correctly, preloading reduces or overcomes the causes of these problems: it controls radial and axial play; provides predictable system rigidity; reduces non-repetitive run-out; reduces the difference in contact angles between the inner and outer rings at very high speeds; and controls ball skidding under very high acceleration.
Bearing yield
Axial yield is the axial deflection between inner and outer rings after end play is removed and a working load or preload is applied. It results from elastic deformation of balls and raceways under thrust loading. Similarly, radial yield is the radial deflection caused by radial loading. both types of yield are governed by the internal design of the bearing, the contact angle and load characteristics (magnitude and direction).

In all bearing arrangements where preload is deemed to be necessary, it should be applied as lightly as possible in order to achieve the desired result, avoiding excessive heat generation, which reduces speed capability and bearing life.

In addition, it is important to select the most appropriate method of preloading, of which there are three main types: springs, axial adjustment, and preload ground Duplex bearings. 球轴承英文文献和中文翻译(6):http://www.youerw.com/fanyi/lunwen_16480.html