Methods and stiffness bearing grease

1: bearing grease methods:
Note fat content on the sealing performance of a large number of tests that, when the amount of grease within the bearing cavity volume is about 30% or less, due to the internal bearing no saturated fat, so very little grease leakage. Note more than 30% fat, bearing the internal local produce saturation, when the grease reaches 50%, the bearing grease to reach full saturation, excess fat is "squeezed" out. Special attention, and sometimes little attention despite the grease, but grease methods are not standardized, scientific, leading to uneven bearing grease cavity, will also appear bearing partial saturation, occurred early and rapid "squeeze out" phenomenon.
The processes are fat, recommended speed may increase a little. Seal bearing sealed bearing test and evaluation test method for seal bearing different performance characteristics and purposes carried out, focusing on different elements to carry out the test is not the same, but each of the performance test is an important feature of content, while sealed bearing test and evaluation method is verified and improved design and quality control of important tool.
2: Bearing Stiffness:
1. Bearing stiffness depends on its type and size. The main criterion is: roller element type (such as spherical or cylindrical), the number and size of the roller and the contact angle.
2. Contact angle on the stiffness, the contact angle is generally small, to meet the high radial stiffness; contact angle is greater, to meet the high axial stiffness. In the arrangement of bearings, the same location to install two or more bearings to increase rigidity. Angular contact ball bearings and the most suitable for such use is often paired use.
3. Bearing stiffness formulation for the elastic deformation under load and recovery rate levels. As the load bearing elastic recovery and not a linear relationship, it is difficult to use a single function; in the application of the linear relationship can be approximated estimates.
4. Bearing stiffness is affected by the impact of the spindle and bearing, the fit tolerance should be selected carefully; pair stiffness of the bearing is also subject to pre-load.
5. The number of roller bearings on the stiffness is greater than the impact of size. The same percentage increase in the number of roller bearings increase bearing stiffness greater than the increase in size of the increase of bearing stiffness. For this reason, precision roller bearing to increase the number of enhancing its rigidity.

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