Automotive wheel bearings riveting process applications

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Automotive wheel bearings mainly bear the weight of the car and the drive wheels to provide the situation correct wizard. Wheel bearings bear radial load and axial load, is a very important safety device. Most domestic cars s till use the traditional two separate sets of tapered roller bearings or angular contact ball bearings, this structure is to go through the adjustment in the automotive assembly clearance, preload, fatliquoring and many other processes, more human doping control factors, the assembly of the difficulty of the larger, resulting in longer automobile assembly line, the high cost and poor reliability, it is difficult to adapt to the fierce competition in the market.steel ball bearings
In recent years, with the rapid development of the front front drive car, the wheel bearings occurred great changes, especially the well-known foreign auto manufacturers and bearing manufacturers joint research and development, emerging new wheel hub bearing unit, already into the fourth generation.
NSK riveting forming third-generation hub uranium Order of the traditional design of third-generation hub bearing unit, the two inner ring with the locking nut firmly connected together, while the NSK developed new structure is through the axial end of the rivet pressure forming the axial force to the flanged inner ring plastically deformed and compacted with a small inner ring. Remove the nut helps to reduce the hub unit weight and size, and improve reliability. Driving wheels and non-drive wheels are applicable. Using riveting pressure forming technology, reliability will be improved, even if the connection nut loose bearing itself can also provide the guarantee of the preload.bearing manufacturers
Riveting pressure molding is used in the riveting process (as shown), the riveting head (upper mold) that are inclined in the bearing assembly when the riveting, with the axial end of the flange of the inner ring by the pressure from the lower portion of the plastic deformation, until the small inner circle firmly together. During the forming process, the wheels deformation is divided into three phases: the first phase, rivet head down, in contact with the wheel axis deformation began. Second stage, deformation further expansion, the radial extension of the hub axle, in contact with the inner ring chamfer. Finally, the third stage, the completion of the riveting process. In the first stage, almost all of the riveting head pressure for initial forming of the hub axle and the inner ring load is small and constant. In the second stage, the rivet head pressure delivered to the inner ring, the inner ring load increases rapidly. In the third stage, due to the the rivet head pressure of the inner ring load gradually increases until saturation, riveting after the end of the pressure, even the rivet head up the inner ring load have not been eliminated, and still retains some of the load. That residual load clamping force.china bearin g company
Traditional forging so that the entire workpiece is compressed and plastically deformed. Therefore, when processing large size workpiece takes a lot of pressure, and when used in bearings, deformation often outside the center area. Such great under pressure, the ball and raceway be squeezed, likely to be damaged during processing bearings riveting process only partially deformed and using only a small pressure. Through control of the pressure of the load, this process is very suitable for the bearing assembly. Riveting forming the edge of the fatigue strength and inner ring creep resistance under heavy load operation durability test inspection. The static strength test in order to examine riveting molded edge of static strength as well as the torque load of the bearing just varying the test, because the rigidity of the bearing will affect the steering stability when the vehicle is turning.
According to the results of the trials, NSK newly developed Ri veting forming the inner ring and the third generation of the self-locking wheel hub bearing is equivalent to or even better than with locknut traditional wheel bearings. Guarantee high reliability under the premise of the weight and size is reduced to meet the current market demand, reduce vehicle fuel consumption.double bearing