By analyzing the structural characteristics of domestic and foreign bearing product cages of the same type, and referring to the current structural design method of metal stamping cages for single-row tapered roller bearings in China, the structural design and design of plastic cages for double-row tapered roller bearings for automobile wheel hubs are discussed. Calculation of main parameters. Key words: double row tapered roller bearing; wheel hub bearing; plastic cage; 1 Document code: B Article number: 1000-3762 (2008) 06-0007-03 Symbol description D ——The diameter of the big end of the roller, mmD. ——The diameter of the small end of the roller, mm————The projected length of the element line of the roller on the center line of the roller, mm Received date: 2007-10-18; Revised date: 2008-01-30. (b——the angle between the element line of the roller and its center line, (.)—the nominal contact angle of the bearing, (.) the angle between the cage beam and the bearing centerline, (.)—the pressure slope of the cage beam Angle, (.)△c– the width of the large end of the cage window hole, mmAC.–the width of the small end of the cage window hole, mmZ.–the length of the cage window hole, Hun Figure 3 shows the variation of the dimensionless friction force with the dimensionless rotational speed Happening.

It can be seen from the figure that as the rotational speed increases, the dimensionless friction force and rotational speed are not completely linear. When the rotational speed is low, the friction force is greatly affected by the rotational speed; when the rotational speed is high, the influence of the rotational speed on the friction force gradually tends to be stable, and the friction force and the rotational speed have an approximate linear relationship. In general, normal working conditions belong to this linear region. Photo 3 The relationship between the dimensionless friction force and the dimensionless rotational speed.

Conclusion (1) With the increase of rotational speed, the changes of eccentric distance and eccentric direction are nonlinear, and the change speed gradually slows down, and finally tends to be stable. (2) There is also a nonlinear relationship between rotational speed and friction, which is particularly obvious at the moment of startup; under normal working conditions, the relationship between the two is approximately linear and can be regarded as a linear relationship . References: [1] Yan Qinghua, An Qi. The performance of the three-oil wedge fixed pad sliding bearing during the start-up process [J]. Journal of East China University of Science and Technology: Natural Science Edition, 2007, 33(4): 569—572. [2] Gao Lei, Liu Jun, An Qi. Numerical analysis of cylindrical arc oil wedge thrust sliding bearing[J]. Lubrication and Sealing, 2007, 32(8): 99-102. [3] Yan Qinghua, An Qi. Research on the influence of three oil wedge fixed pad sliding bearing space installation orientation on its performance[J]. China Mechanical Engineering, 2007, 18(11): 1281-1284. [4] Yan Qinghua, Yan Yongming, An Qi. Influence of preload coefficient on stability of three-oil wedge radial sliding bearing[J]. Journal of East China University of Science and Technology: Natural Science Edition, 2006, 32(11): 1365—1368. [5] Yan Qinghua, An Qi. Influence of several parameters of three-oil wedge bearing on the instability speed of rigid and elastic rotor[J]. Journal of East China University of Science and Technology: Natural Science Edition, 2007, 33(5): 737—740. [6] Yan Qinghua, An Qi. Influence of structural parameters of three-oil wedge fixed pad sliding bearing on the instability speed of rigid Jefeott rotor[J]. Machine Tools and Hydraulics, 2007, 35(9): 35-36. [7] Sehulhr Fredrick T. Anderson William J. ExperimentsOiltheStability ofWater-lubricatedThree——SectorHy··dredynamic Journal Bearings at Zero ad[z]. NasaTechnical Note Nasa Tn D-5752. z. ——The width of the ribs at the big end of the cage, mrfl————The width of the ribs at the small end of the cage, mm S——The thickness of the cage beam, mm c——The width of the cage beam, mrfl h——The thickness of the small end section of the cage, mm — Thickness of the section at the big end of the cage, mm d —— the radial dimension of the special point A on the center line of the cage, mm d —— the radial dimension of the special point on the center line of the cage, mm d —— at the position of the cage window hole The radial dimension of the center of the small end of the upper roller, mm – the center of the large end of the roller at the position of the cage window

Radial dimension, mm R. ——The radius of the inner arc of the big end of the cage, mm. — — Radius of the inner arc of the small end of the cage, mm B. ——Width of cage, mm D ——Outer diameter of cage big end, mrfl D ——Cage mold parting size (inner diameter of cage big end), mmd. – The inner diameter of the small end of the cage.