For the situation in Figure 6, the rear gear and the axle anti-neck should be selected strictly in accordance with the specified interference amount. Analysis of bearing pressing curve Figure 2 Bearing pressing curve In the bearing press-fit curve of Fig. Since the equipment work started, a corresponding pressure value was recorded every 0. Measures and effects 1) For the situation of Figures 3 and 4, during parts processing, ensure the roughness of the bearing seal seats 3, 7 and the intermediate ring 5 and eliminate the sharp edges of the introduction part, and the introduction of the journal after grinding the axle The arc transition is made with No.
The displacement-pressure compound curve truly reflects the quality of the press fit.085mm.91%. the moment the bearing rear seal seat 7 enters the mating state along the axle journal introduction part, there is a process of alignment to overcome a large friction force. The compound stage includes the changes of the entire bearing and the rear gear. 1, the top 1 of the bearing press is extended to accurately position the wheel pair, and the clamping device fixes the wheel pair. This kind of situation occurs more frequently in the assembly of RD2 (A) axles; in B axles, there are few, almost none. Mechanism analysis of bearing assembly Figure 1 Schematic diagram of bearing press-fit structure The bearing is assembled as an interference cold press. A-type axle journal and anti-neck are processed by two machine tools.
At the same time, adjust the flow of hydraulic oil at both ends and the working time to eliminate the phenomenon of no-climbing process. Affected by the difference in the accuracy of the grinder and Mechanical ball bearing the secondary clamping of the workpiece, it is easy to cause a certain deviation in the coaxiality of the journal and anti-neck relative to the reference shaft. In Figure 6, when the double-end press is installed, the left and right curves will wait for each other due to the asynchronous pressure oil, and the matching coefficient of the rear gear and the axle neck is small, forming a curve without climbing process.
Subsequently, the press-fitting cylinder 2 pushes the bearing placed on the bearing bracket. In the assembling process of Fig. The curve rises and immediately enters the pressure holding stage t6 (the AB section reflects the deformation of the bed); t6: Hold pressure for 5s (BC section). Under normal circumstances, the pass rate of one-time press-fitting of bearings can reach more than 96. Because the parts of the axle journal are already tight at this time, the work is still proceeding with the axle journal as the benchmark. a. When the friction force generated by the positive pressure is formed on the surface, the bearings (front and rear seal seats 3, 7, the two inner rings 4, 6, and the spacer ring 5) and the rear block 8 move relative to the axle journal anti-neck. The inner diameter of the seal seat, the inner diameter of the bearing inner ring and the journal interference are between 0. Segment AB of the stage.
Tags: Mechanical ball bearing
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