Spherical bearing surface and production cost of rod end spherical bearings

- Jun 04, 2018 -

In the manufacturing process of the rod end spherical bearing, it is necessary to effectively ensure the overall dimensions of the entire rod end joint bearing, and at the same time ensure the wall thickness of the outer ring to a certain extent, so that the rod end can be effectively increased. The pressure bearing capacity of the spherical plain bearing can conveniently separate the inner ring and the outer ring to a certain extent, and facilitate the replacement of the inner ring or the outer ring, which effectively reduces the production cost. The outer ring includes a pull rod.

In the end spherical bearing, an inner ring is arranged in the outer ring, and to a certain extent, its main feature is that the outer ends of both ends of the outer ring are respectively provided with notches, and the length of the notches corresponds to the outer diameter of the inner ring. The width corresponds to the thickness of the inner ring. The inner ring is inserted into the outer ring through the gap, and the outer ring forms a spherical contact with the inner ring.

The rod end spherical bearing has two fitting spherical contact surfaces. To some extent, such contact is called coordinated contact. When using it, the calculation method of the mechanical properties of the joint bearing is very important to the structural design and wear of the joint bearing. The role of coordinating surface contact pressure calculation is a very complicated problem. The existing Hertz model is limited to the elastic half-space volume and cannot be used to calculate the spherical coordinate contact pressure distribution. At present, there is a spherical contact unified model, namely Fang model, which can better solve the problem of contact pressure distribution of small deformation spheres.

The contact area of the rod end spherical bearing is not a complete spherical surface. The calculation of the contact pressure distribution during operation needs to be further calculated based on the complete spherical contact contact model. In addition, the free end effect of the rod end spherical bearing will also occur during use. , The application of joint bearings will have a certain impact. The free boundary effect produces contact pressure concentration and a large pressure gradient at the edge of the outer ring of the joint bearing.