Flange bearing end face and rim contact stress

Contact stress between roller end and guard can use described above formula to calculate the contact stress and deformation, surface usually is flat, it connected to the roller to a convex shape has a circular chamfering. Guard can also be a part of the plane. In the cylindrical roller bearing, it is a usual design. When demand between roller end and guard carry thrust load, sometimes will guard design into a cone. In this case, the roller chamfer will contact with the rim, rim and the Angle between the radial plane called guard Angle. In addition, the roller end face can be designed into sphere, make the spherical end face of the roller and inclined rim contact, this structure will help improve the lubrication, but will reduce the guard's ability to guide roller. In this case, must rely on a plane to control roller. In the case of spherical end face roller with helical rim, can simulate them for sphere contact with the cylinder. In order to facilitate calculation, the radius of the sphere is equal to the end of the spherical roller radius, and the radius of the cylinder can use the tapered guard in place of radius of curvature to approximate theory contact. According to the known elastic contact load, roller rim material properties and contact the geometric parameters of contact stress and deformation can be calculated. This method can only be approximate, because the roller end face and guard can not meet the needs of half space Hera 'hypothesis. In addition, the radius of curvature of the tapered guard is not constant, but along the contact width in change. This method applies only to complete the spherical roller end face contact with the conical guard. Not proper geometry and excessive askew could make contact ellipse edge guard, oil groove or roller chamfer truncation, this kind of situation is no longer suitable for using Hertz theory model, and should be avoided in the design, otherwise it will lead to the edge of the high stress and worsen lubrication. Flat end roller contact with helical rim rarely comes down to a simple contact stress calculation problem, because in the roller chamfer with flat end face junction and its nearby, the nature of the contact surface is difficult to appropriate simulation. For approximate calculation, can use the concept of effective radius of roller, it is a connecting end of the roller chamfer peace imaginary radius. If necessary, finite element stress analysis technology can be used to obtain more accurate contact stress distribution.