By analyzing the structural characteristics of the cages of the same type of bearing products at home and abroad, referring to the current domestic structural design methods of metal stamping cages for single-row tapered roller bearings, the structure design and structural design of plastic cages for double-row tapered roller automotive hub bearings are discussed. Calculation of main parameters. Keywords: double-row tapered roller bearings; wheel hub bearings; plastic cages; structural design Chinese map classification number: TH133.33 2; TH123. 1 Document symbol code: B Article number: 1000—3762 (2008) 06-0007—03 Symbol description D ——The diameter of the roller's large head, mmD. ——Roller head diameter, mm — —The projection length of the roller element line on the roller centerline, mm Received date: 2007-10-18; revised date: 2008-01-30. (b—The angle between the element line of the roller and its centerline, (.)—The nominal contact angle of the bearing, (.) The angle between the cage beam and the center line of the bearing, (.)—The pressure slope of the cage beam Angle, (.) △c-—The width of the large end of the window hole of the cage, mmAC.—The width of the small end of the window hole of the cage, mmZ.—The length of the cage window, Hun Figure 3 shows the change of the dimensionless friction force with the dimensionless speed It can be seen from the figure that as the speed increases, the relationship between the dimensionless friction and the speed is not completely linear. When the speed is low, the friction force is greatly affected by the speed; when the speed is higher At the time, the influence of speed on friction gradually stabilizes, and the relationship between friction and speed is approximately linear. Generally, normal working conditions belong to this linear region. Figure 3 Dimensionless friction and dimensionless The relationship between speed. Conclusion (1) With the increase of speed, the changes of eccentricity and eccentricity direction are both nonlinear, and the speed of change gradually slows down, and finally stabilizes. (2) The relationship between speed and friction is also non-linear. Linear relationship, this nonlinear relationship is particularly obvious at the moment of startup; under normal operating conditions, the relationship between the two is approximately linear and can be regarded as a linear relationship. References: [1] Yan Qinghua, An Qi. 3 The performance of oil wedge fixed bush sliding bearing during starting 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. Cylindrical arc Numerical analysis of oil wedge thrust sliding bearings [J]. Lubrication and Sealing, 2007, 32(8): 99-102. [3] Yan Qinghua, An Qi. Research on the effect of the three-oil wedge fixed shoe sliding bearing space installation orientation on its performance [J]. China Mechanical Engineering, 2007, 18(11): 1281-1284. [4] Yan Qinghua, Yan Yongming, An Qi. The influence of preload coefficient on the stability of three-oil wedge radial sliding bearings[J]. East China Journal of University of Science and Technology: Natural Science Edition, 2006, 32(11): 1365-1368. [5] Yan Qinghua, An Qi. The influence of several parameters of three-oil wedge bearings on the instability speed of rigid and elastic rotors[J]. East China University of Science and Technology Journal: Natural Science Edition, 2007, 33(5): 737-740. [6] Yan Qinghua, An Qi. The influence of the structural parameters of the three-oil wedge fixed shoe sliding bearing on the instability speed of a rigid Jefeott rotor [J]. Machine tools and hydraulics , 2007, 35(9): 35-36. [7] Sehulhr Fredrick T. Anderson William J. Experiments Oilthe Stability of Water-lubricated Three—Sector Hy··dredynamic Journal Bearings at Zero ad [z]. NasaTechnical Note Nasa Tn D-5752. z. ——Guaranteed Reinforcement width at the large end of the cage, mrfl — — Reinforcement width at the small end of the cage, mm S—thickness of the cage beam, mm c—width of the cage beam, mrfl h—thickness of the small end section of the cage, mm—Cage holder Thickness of the large end section, 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 —— roll on the position of the cage window hole The radial dimension of the center of the small head, mm — — The radial dimension of the center of the big head of the roller at the position of the cage window hole, mm R. ——The inner arc radius of the big end of the cage, mm. — — The inner arc radius of the small end of the cage, mm B. —— Cage width, mm D —— Cage large end outer diameter, mrfl D —— Cage mold parting size (cage large end inner diameter), mmd. ——Inner diameter of small end of cage.