上游充通大学 SHANGHAI JIAO TONG UNIVERSITY Rolling Elements Ball Spherical Asymmetrical Cylindrical Taper Needle 16
16 Rolling Elements Cylindrical Needle Taper Ball Spherical Asymmetrical
上游充通大 SHANGHAI JIAO TONG UNIVERSITY Types of Loads Radial loads(径向力)：act toward the center of the bearing along a radius,created by spur gears( 齿轮)，V-belt drives,.and chain drives. Thrust loads(轴向力)：act parallel to the axis of the shaft.The axial components of the forces on helical gears(斜齿轮)，bevel gears(圆锥齿轮)，or supporting shafts with vertical axes. Misalignment(轴线偏斜)：refers to the angular deviation of the axis of the shaft at the bearing from the true axis of the bearing itself. 17
17 Radial loads(径向力): act toward the center of the bearing along a radius, created by spur gears(直 齿轮), V-belt drives, and chain drives. Thrust loads(轴向力): act parallel to the axis of the shaft. The axial components of the forces on helical gears(斜齿轮), bevel gears(圆锥齿轮) , or supporting shafts with vertical axes. Misalignment(轴线偏斜): refers to the angular deviation of the axis of the shaft at the bearing from the true axis of the bearing itself. Types of Loads R A
上游充通大 SHANGHAI JIAO TONG UNIVERSITY Types of Ball Bearings (a) (b) () (d) (e) Deep groove Filling notch Angular contact Shielded Sealed 深沟球 有装球缺口 角接触 带防尘盖 带密封圈 (f) (g) (h) (i) (i) External Double row Self-aligning Thrust Self-aligning thrust self-aligning 带球面外衬圈 双列球 双列自动调心 单向推力 单向推力带 球面座圈 18
18 Types of Ball Bearings 深沟球 有装球缺口 角接触 带防尘盖 带密封圈 带球面外衬圈 双列球 双列自动调心 单向推力 单向推力带 球面座圈
上游文大学 SHANGHAI JIAO TONG UNIVERSITY Concept of Contact Angle n A R R (a) (b) (c) 19
19 Concept of Contact Angle
上游充通大 SHANGHAI JIAO TONG UNIVERSITY Types of Ball Bearings Single Row Deep Groove (Conrad)BB (单列深沟球轴承) >Spherical balls roll in deep groove in both races >Space maintained by separators(retainers/cages) >Ball radius smaller than groove radius >Mostly take radial loads,some thrust load(轴向载荷) >Theoretical point contact(actually a small circular area),so high local contact stress >Some permissible misalignment ↓20
20 Types of Ball Bearings • Single Row Deep Groove (Conrad) BB （单列深沟球轴承） Spherical balls roll in deep groove in both races Space maintained by separators (retainers/cages) Ball radius smaller than groove radius Mostly take radial loads, some thrust load(轴向载荷) Theoretical point contact (actually a small circular area), so high local contact stress Some permissible misalignment