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The concept of rolling mill bearings
2025-03-24
Rolling mill bearings are generally only used to withstand radial loads. Compared with deep groove ball bearings of the same size, they have a larger radial load capacity and a maximum speed close to that of deep groove ball bearings. However, the machining requirements for the shaft and housing holes that are matched with such bearings are higher, allowing the inclination of the inner ring axis and the outer ring axis to be very small (2 ° -4 °). If the inclination of the two axes exceeds the limit, the contact between the rollers and the ring raceway will deteriorate, seriously affecting the load capacity of the bearing and reducing its service life. So if this type of bearing needs to be installed in the main components that bear axial loads, it can only be used under the premise of using other types of bearings to bear axial loads at the same time.
Generally speaking, bearings are mostly ball and roller bearings. Rolling bearings are precision mechanical components that convert the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing friction losses. Rolling bearings are generally composed of an outer ring, an inner ring, rolling elements, and a cage. Rolling bearings are easy to use and maintain, reliable in operation, have good starting performance, and have high load-bearing capacity at moderate speeds. Compared with sliding bearings, rolling bearings have larger radial dimensions, poorer vibration reduction capabilities, lower lifespan at high speeds, and louder noise.
The radial bearing in rolling bearings (mainly bearing radial forces) usually consists of four parts: inner ring, outer ring, rolling elements, and rolling element cage. The inner ring is tightly fitted onto the shaft neck and rotates together with the shaft, while the outer ring is installed in the bearing seat hole. There are raceways on both the outer circumference of the inner ring and the inner circumference of the outer ring. When the inner and outer rings rotate relative to each other, the rolling elements roll on the raceway of the inner and outer rings, separated by a cage to avoid friction with each other.
The thrust bearing is divided into two parts: the tightening ring and the active ring. The tight ring is tightly connected to the shaft sleeve, and the active ring is supported on the bearing seat. The rings and rolling elements are usually made of high-strength and wear-resistant rolling bearing steel, and the surface hardness after quenching should reach HRC60-65. Retainers are often made of soft steel stamping, but can also be made of copper alloy cloth, rubber wood, or plastic.
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