New spherical roller bearing structure
Spherical roller bearings are widely used in steel, paper, marine, electric power, engineering machinery, etc. due to their high load carrying capacity, good vibration resistance and compensation for concentricity errors due to machining, installation and shaft deformation. The industry's steel-making converters, continuous casting machinery, paper machinery, lifting machinery, reducers, vibrating screens, crushers and other mechanical equipment. With the continuous research and optimization of spherical roller bearings in recent years, the design and processing technology of spherical roller bearings has been rapidly developed, and its performance has also been greatly improved.
Compared with the CC type spherical roller bearing, the new spherical roller bearing structure described in this paper has an increase in the diameter, number and length of the rolling elements, and a large increase in the rated dynamic load.
1 structural comparison of spherical roller bearings
The new structural bearings have no fixed intermediate ribs and small ribs. The steel stamping cage is used. The inner and outer rings and rolling elements are similar to the traditional CC-type spherical roller bearings, as shown in Figure 1. The main difference is in the structure of the cage and the middle retaining ring.
1.1 cage structure
The traditional CC type spherical roller bearing cage has a bowl shape and adopts a radial locking rolling body at the lintel, which has the advantages of simple structure and easy processing. However, the structural cage lintel is located near the centerline of the rolling element assembly, where the position of the longitudinal dimension of the rolling element is almost the maximum, so the width of the lintel is greatly limited, and the width of the lintel is also due to the presence of the locking point. Narrower. In the design process, in order to ensure sufficient strength and rigidity of the cage lintel, measures to reduce the diameter of the rolling element and reduce the number of rolling elements are often taken, which will inevitably affect the radial dynamic load of the bearing.
The shape of the new structure cage is more complicated. as shown in picture 2. The structural girders avoid the maximum size position of the longitudinal section of the rolling element, so that the strength and rigidity of the lintel can be improved. In addition, the large end plate is pressed to form a locking point, and the rolling end face recess is used to realize the locking rolling. The function of the body reduces the influence on the strength and stiffness of the lintel, making it possible to increase the number and/or diameter of the rolling elements. However, the design and processing of such structural frames are difficult. At present, domestic cage processing enterprises are exploring.
1.2 Comparison of the structure of the middle retaining ring
The middle retaining ring of the conventional CC type spherical roller bearing is located between the inner ring, the cage and the rolling element, and has contact with the outer diameter of the inner ring, the inner diameter of the large end of the cage, and the end surface of the rolling element, which can realize the cage and The precise guidance of the rolling elements, but also has the disadvantages of large friction, difficult lubrication, and large vibration and noise. In addition, due to the limitation of the strength and processing of the middle retaining ring, the outer cylindrical surface width of the inner ring of the bearing
2E can't be too small, so the length of the roller is limited to some extent.
© 2017 - 2019 PC Sites All Rights Reserved