Rolling
In the work of rolling friction bearing . Rolling easy maintenance , reliable, good starting performance , at moderate speeds higher carrying capacity. Comparison of the sliding bearing , the larger the size of the radial rolling bearing , poor damping capacity , high speed , low life , noise is large. Rolling bearings in the heart ( mainly radial force ) usually kept by the inner, outer , rolling and rolling rack 4 parts. Inner sleeve and rotating together with the shaft in the journal , the outer ring mounted in the housing bore . The inner periphery of the outer periphery of the inner ring and outer rings are formed with the raceway . When the relative rotation of the inner and outer rings, rolling elements that the outer ring raceway , including that they are separated by a cage, to avoid friction . Thrust bearing of a tight circle and live ring in two parts. Tight circle and sleeve tight, live ring bearing in the bearing housing . Rings and rolling elements are usually made of high strength , good wear resistance rolling bearing steel, surface hardness after quenching should reach HRC60 ~ 65. Multi cage made of soft steel stamping , copper alloys can also be used bakelite cloth or plastic manufacturing .
Many types of rolling bearings .
1, according to the direction of load can be divided into radial bearings ( radial force and small axial force ) , thrust bearing ( only bear axial force ) and bearing thrust to the heart ( can withstand radial and axial force ) .
2 , can be divided according to the shape of the rolling ball bearings, roller bearings and needle roller bearings.
3, according to the working conditions can be divided into plain bearings , high-speed bearings , high temperature bearings, bearing low temperature vacuum bearings, magnetic bearings , corrosion-resistant bearings, precision miniature bearings and oversize bearings. Chinese types of rolling bearings into the B, C, D, E, G 5个accuracy level , B is the highest accuracy level , G is an ordinary precision level , the most common.
Rolling bearings are standard , mass-produced by specialized bearing factory. Factors to consider design options often have life , load, precision , clearance ( radial and axial ) , speed , friction torque, aligning performance , preload and rigidity , vibration and noise .
Advantages compared to plain bearings, rolling bearings
1 , under normal conditions, the efficiency of the hydrodynamic lubrication of rolling bearings and bearing equivalent, but higher than the number of hybrid -lubricating bearing ;
2 , radial clearance is relatively small, angular contact bearings are available to the heart of available preload preload to eliminate backlash , high running accuracy ;
3, for the same size shaft, the rolling bearing width smaller than the sliding bearings , can axially compact structure of the machine ;
4 , most of the rolling bearing can be simultaneously subject to radial and axial load bearing composite structure so simple ;
5 , consume less lubricant , easy to seal , easy to maintain ;
6 , no useful for non-ferrous metals ;
7, the high degree of standardization , mass production, low cost.
Compared with the sliding bearing , the bearing disadvantages:
1 , less able to withstand impact loads ;
2 , the high-speed heavy duty load bearing life is low ;
3 , vibration and noisy ;
4 , the radial dimension than the sliding bearings.
In the work of rolling friction bearing . Rolling easy maintenance , reliable, good starting performance , at moderate speeds higher carrying capacity. Comparison of the sliding bearing , the larger the size of the radial rolling bearing , poor damping capacity , high speed , low life , noise is large. Rolling bearings in the heart ( mainly radial force ) usually kept by the inner, outer , rolling and rolling rack 4 parts. Inner sleeve and rotating together with the shaft in the journal , the outer ring mounted in the housing bore . The inner periphery of the outer periphery of the inner ring and outer rings are formed with the raceway . When the relative rotation of the inner and outer rings, rolling elements that the outer ring raceway , including that they are separated by a cage, to avoid friction . Thrust bearing of a tight circle and live ring in two parts. Tight circle and sleeve tight, live ring bearing in the bearing housing . Rings and rolling elements are usually made of high strength , good wear resistance rolling bearing steel, surface hardness after quenching should reach HRC60 ~ 65. Multi cage made of soft steel stamping , copper alloys can also be used bakelite cloth or plastic manufacturing .
Many types of rolling bearings .
1, according to the direction of load can be divided into radial bearings ( radial force and small axial force ) , thrust bearing ( only bear axial force ) and bearing thrust to the heart ( can withstand radial and axial force ) .
2 , can be divided according to the shape of the rolling ball bearings, roller bearings and needle roller bearings.
3, according to the working conditions can be divided into plain bearings , high-speed bearings , high temperature bearings, bearing low temperature vacuum bearings, magnetic bearings , corrosion-resistant bearings, precision miniature bearings and oversize bearings. Chinese types of rolling bearings into the B, C, D, E, G 5个accuracy level , B is the highest accuracy level , G is an ordinary precision level , the most common.
Rolling bearings are standard , mass-produced by specialized bearing factory. Factors to consider design options often have life , load, precision , clearance ( radial and axial ) , speed , friction torque, aligning performance , preload and rigidity , vibration and noise .
Advantages compared to plain bearings, rolling bearings
1 , under normal conditions, the efficiency of the hydrodynamic lubrication of rolling bearings and bearing equivalent, but higher than the number of hybrid -lubricating bearing ;
2 , radial clearance is relatively small, angular contact bearings are available to the heart of available preload preload to eliminate backlash , high running accuracy ;
3, for the same size shaft, the rolling bearing width smaller than the sliding bearings , can axially compact structure of the machine ;
4 , most of the rolling bearing can be simultaneously subject to radial and axial load bearing composite structure so simple ;
5 , consume less lubricant , easy to seal , easy to maintain ;
6 , no useful for non-ferrous metals ;
7, the high degree of standardization , mass production, low cost.
Compared with the sliding bearing , the bearing disadvantages:
1 , less able to withstand impact loads ;
2 , the high-speed heavy duty load bearing life is low ;
3 , vibration and noisy ;
4 , the radial dimension than the sliding bearings.
