The surface of the rolling bearing stress distribution and its size

In order to calculate any 'line' contact stress distribution and its size, the surface of the case including roller crown and their combination, the influence of already built X made a strict mathematical and numerical calculation method. The tension force, but also of the finite element method ( 有限元法) To complete the analysis of the same. In all cases, even for a single contact problems that need to be solved by numerical calculation, and for a given application conditions of the roller shaft analysis, to calculate a lot of contact problem. Figure 625 X is given under the heavy load of a typical ball face and raceway contact finite element analysis results of actual contact area 2 b apparent contact area after the shape a bit like 'dog bone', at the same time at the end of convex and junction of pressure slightly in figure 1. 38 a shows arc convex from theory, and figure 1. 38 columns in figure 6 b. 24 the shape of the line contact with crown from Landberg and oall B work. Figure 6. 26 shows that although each large amount of lateral pressure distribution of convex surface can reduce the edge stress, but also has its own weaknesses. Under light load, the circular arc convex cannot make full use of the length of the roller, the roller to replace the ball on the 6000 is not an option ( See chapter 11) 。 Under the heavy load of 4000 although the edge stress can be avoided in most applications but in the center of the contact area, contact stress may be considerably more than 2000 type of contact stress, the result is still reduced 0 under light load, long performance in figure 1. 38 b locally convex shape of fluid along the length of location/m play child on the contact stress than under the same loading E0. 5 small convex roller, as shown in figure 62. Under the heavy I have 토 due to lower the center of the contact stress locally convex 0. 0 when long also is better than the convex roller, however three a46 contact region plan must pay special attention to 'flat' contour convex and linear part of period of transition of excessive area, or on the edge of the transition diagram 623 severe loading of sub points can produce stress concentration, thus reduce the durable performance of the bearing contact ( Not Het contact instance) ( See chapter 11) 。 When the roller axis relative to the bearing axis tilt, under a given load, the convex edge stress of the roller and local convex roller is smaller than straight to the child. Figure 6. 26 raceway contact load and figure 6. 27 different play child ( Or roll) Convex under stress and the length of the roller, and action in length and load the comparison of the specific load relationship of a) Rectilinear b) The convex ( With permission, from Heusner, H, ball Bearing J, 210, SKF, June197) c) Local convex d) Logarithmic white shape after many years of research, and by means of mathematical tools such as finite difference method and finite method in practical application on the computer has developed a 'log' convex, so as to realize the optimization under the condition of most of the load stress distribution, See 6. 26 d) 。 Is so named because the convex in mathematics can be said with a special logarithmic function under all load conditions, compared with the convex or local convex roller, logarithmic convex can more fully make use of the roller length. Under the condition of slope, in addition to particularly heavy load, it can also avoid the happening of edge load. When a specific load ( Q / 1 d) Change from 20 to 100 mpa, and the figure 6. 27 ( From literature [ 26) Shows that the contact stress distribution over the different