The working characteristics of rolling bearing and the commonly used materials

Rolling bearing is standard parts. This chapter mainly shows the characteristics of the commonly used rolling bearing type, according to the working conditions to choose the suitable bearing type and size, and combination design. 1 an overview of the rolling bearing is widely used in mechanical support. Its function is under the condition of ensure the bearing have enough life, to supporting shaft and shaft parts, and makes relative rotation, swing and base such as sports, make rotation as far as possible to reduce the friction between, in order to obtain higher transmission efficiency. Commonly used rolling bearing has formulated the national standard, it was designed by using the theory of rolling friction and batch production of standard parts by professional chemical plant. Just according to the working conditions in mechanical design using rolling bearing type and model for composite structure design. 2 the working characteristics of rolling bearing compared with sliding bearing, roller bearing has the following advantages: ( 1) Simple application design, products have been standardized, and mass produced by professional manufacturers, with excellent compatibility and versatility. ( 2) Starting low friction torque, small power consumption, efficiency of rolling bearing ( 0. 98 - 0. 99). Higher than mixed lubrication bearing. ( 3) Load, rotation speed and working temperature to adapt to a wide range of working conditions of a small amount of mild effect on the bearing performance. ( 4) Most types of bearings can withstand radial and axial load at the same time, the axial size is smaller. ( 5) Easy to maintain and lubrication and maintenance. Rolling bearing has the following disadvantages: ( 1) Most of the rolling bearing radial size larger. ( 2) Under the condition of high speed and heavy load work, life is short. ( 3) Vibration and noise is larger. Three components and materials commonly used 1, rolling bearing structure: rolling bearing is generally composed of inner ring and outer ring, rolling body, and a cage. Inner ring is installed in the shaft neck ( In the thrust bearing is called shaft circle) With relatively tight; Outer ring is installed in the base or parts of bearing hole, usually with a loose. Inner and outer ring raceway, when inside and outside the circle relative rotation, rolling body will follow the groove rolling. Is the realization of rolling friction roller rolling element, in addition to the 'rotation', also around the axis of revolution. Shape is spherical, cylindrical, cone column, needle, drum, etc. The role of the cage is separates rolling body evenly. In order to adapt to certain requirements, some bearing can without inner ring or outer ring, or dust, sealing ring structure, etc. 2, commonly used materials: rolling body with the inner and outer circle material requirements of the high hardness and contact fatigue strength, good abrasion resistance and impact toughness. Chromium alloy steel is commonly used in manufacturing, commonly used materials have GCr15, GCr15SiMn, GCr6, GCr9, etc. , after heat treatment the hardness of HRC61 - 65. Maintains a low carbon steel plate stamping and become, is commonly used in high-speed bearing use non-ferrous metals (more Such as brass) Or plastic cage. Compared with sliding bearing, roller bearing has the following advantages: ( 1) Simple application design, products have been standardized, and mass produced by professional manufacturers, with excellent compatibility and versatility. ( 2) Starting low friction torque, small power consumption, efficiency of rolling bearing ( 0. 98 - 0. 99). Higher than mixed lubrication bearing. ( 3) Load, rotation speed and working temperature to adapt to a wide range of working conditions of a small amount of mild effect on the bearing performance. ( 4) Most types of bearings can withstand radial and axial load at the same time, the axial size is smaller. ( 5) Easy to maintain and lubrication and maintenance.