Analysis of ball bearing some preset pressure appropriate selection criteria and fever

Analysis of ball bearing some suitable preset pressure selection criteria and fever so-called face, is to point to to apply the 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. Ball of ball bearing contact with the rail groove surface radius of the long axis of the ellipse to a, short shaft radius is b, the ellipse area S = л ab. In addition, if a component perpendicular to the contact area is set to Q, lateral pressure = Q/S. Units are usually in the form of MPa. The standard of the selection of surface pressure is as follows: considering the factors of noise, life ( 1) When life more than 10000 hours, take the preset pressure under 800 mpa surface pressure. （ 2) Life for 5000 ~ 10000 hours ( General level) , surface pressure of the preset pressure 1000 mpa. （ 3) Life of 5000 hours when the following ( Attaches great importance to the rigid) , surface pressure of the preset pressure 1500 mpa. If the material is high carbon chromium steel, surface pressure of more than 2700 mpa, which will start to produce plastic deformation. So even if the load is a short, if the applied load is equal to the mean surface pressure 2700 mpa, won't make the bearing damage, but from the view point of safety, recommend will exert load control in less than 1600 mpa. Sealed ball bearing rotating fever is due to the excessive grease with high viscosity type, type viscous grease's rotation by stirring, for mixing and heat resistance. Countermeasure is to reduce the amount of filling grease, or change oriented type grease, etc.