The page and the bearing preloading and rigidity method and purpose are introduced

The page and the bearing preloading and rigid, the method and purpose is introduced on the page of how many people to understand the purpose of bearing preloading? How to carry out the preloading and rigid products knowledge as we all know how much? Author popularization for everyone today on the bud bearing preloading purpose, and rigidity is introduced! Miniature ball bearing is composed of outer ring, inner ring, rolling, rolling retainer, seal ( Dust cover) And spring coil of machining parts. Less than 30 mm outside diameter is called the micro and small ball bearing, is to ensure that the shaft of the rotating equipment with high precision requirements stable operation of the bearing parts and assembly in precision parts. Large and medium-sized ball bearing ( The plane related parts) Applied in aviation supplies of ball bearing, relative to the average small ball bearings, ball bearings and the material is different, the number of pay more attention to the durability on the structure. First, what is the purpose of preloading: when the ball bearing in motor, on the axis direction with radial clearance becomes zero load. Add preloading because a radial clearance, the rotation of the ball bearing vibration is big, and the bearing rigidity weakening, etc. , the rotating vibration on the axial load is called the preloading. Preloading is not arbitrary decision, should choice according to the bearing size. Preset pressure obtained is too big, can shorten the service life, and the friction torque is bigger. Preset pressure is too small, and will increase the vibration, rigid, the raceway surface micro vibration caused by wear and tear. Therefore, in the use of ball bearing, it is very important to correctly set a preset pressure. Suitable preset pressure: usually, dahua bearing is recommended to use the right preset pressure is obtained by calculating surface pressure. Face pressure, refers to the to apply preset pressure ball bearing, ball bearing contact with the rail slot part deformation to form an elliptical contact area, ball and place on the contact part of the track groove (of vertical component of Rolling element load) Divided by the value obtained ellipse area. Preloading and rigid: preset pressure method can be divided into the localization of preloading ( Figure 8 - 2) And spring preloading ( Figure 8 - 3) The two methods. Position the preloading is a kind of according to the mechanical relationship preset pressure method. This approach has the advantages of simple structure parts, high rigidity, but on the other hand, the preloading due to abrasion due to the large amount of temperature change and the preloading shortcomings and so on. Spring preloading is a kind of using elastic components such as spiral spring, locking washer to the structure of the bearing pressure exerted xuan, it has the advantages of affected by temperature changes little, but on the other hand, it has increased the structure parts, reduce the rigid shortcomings.