Chapter 17 Universal Gearing 同©大学 TONGII UNIVERSTTY Section 2 Universal joints The classification of universal joints >Transmission parts are elastic,so the According to the According to whether the elastic deformation is kinematic elastic deformation of used to eliminate the characteristics transmission parts with adverse effects of >Nonconstant torque is apparent or not relative movement velocity universal between components >flexible universal joints joints and have the function of buffering and >Near constant velocity universal >rigid universal joints damping joints >Used when the changes in the angle >Constant >Transmission parts are and length of a drive velocity universal rigid and the power is shaft are slight joints transmitted by rigid hinge
Chapter 17 Universal Gearing The classification of universal joints According to whether the elastic deformation of transmission parts with torque is apparent or not flexible universal joints rigid universal joints Transmission parts are elastic, so the elastic deformation is used to eliminate the adverse effects of relative movement between components and have the function of buffering and damping Used when the changes in the angle and length of a drive shaft are slight Transmission parts are rigid and the power is transmitted by rigid hinge Section 2 Universal joints According to the kinematic characteristics Nonconstant velocity universal joints Near constant velocity universal joints Constant velocity universal joints
Chapter 17 Universal Gearing 窗月桥大学 TONGII UNIVERSITY Nonconstant velocity universal joints >Characteristic:simple structure ,reliable and permit large angle between two drive shafts(15-20); >The most common type of nonconstant velocity universal joint is Cardan universal joint
Chapter 17 Universal Gearing Characteristic: simple structure ,reliable and permit large angle between two drive shafts(15-20 °)； The most common type of nonconstant velocity universal joint is Cardan universal joint Nonconstant velocity universal joints
Chapter 17 Universal Gearing 同©大学 TONGII UNIVERSTTY The composition of Cardan universal joints >Main components:spider,universal joint yokes(two),needle bearing,bearing cap,seal,etc. 十字轴 传动轴叉 卡环 万向节叉 轴承 十字轴式刚性万向节
Chapter 17 Universal Gearing Main components: spider ,universal joint yokes(two), needle bearing, bearing cap, seal, etc. The composition of Cardan universal joints
Chapter 17 Universal Gearing 同©大学 TONGII UNIVERSTTY The lubrication and sealing of Cardan universal joints >The abrasion of journals and needle bearings shows the damage of Cardan universal joints 油封座 滑脂嘴 油封 >Now the rubber seal is used 油封挡盘 to replace the former felt and cork seal on universal joints >The grease gun is used to fill the grease chamber and when the grease pressure is greater than the allowable pressure,the 油道 grease will spill from the contact surface between the 十字轴润滑油道及密封装置 rubber seal and journal
Chapter 17 Universal Gearing The abrasion of journals and needle bearings shows the damage of Cardan universal joints The lubrication and sealing of Cardan universal joints Now the rubber seal is used to replace the former felt and cork seal on universal joints The grease gun is used to fill the grease chamber and when the grease pressure is greater than the allowable pressure, the grease will spill from the contact surface between the rubber seal and journal
Chapter 17 Universal Gearing 同©大学 TONGII UNIVERSTTY The axial retaining of needle bearing assemblies >Why must needle bearing assemblies Questio be retained? n Common methods >The bearing assemblies are retained by bearing plates >The bearing assemblies are retained by circlips >The bearing assemblies are retained by bolted caps >The bearing assemblies are retained by plastic rings
Chapter 17 Universal Gearing The axial retaining of needle bearing assemblies Common methods The bearing assemblies are retained by bearing plates The bearing assemblies are retained by circlips The bearing assemblies are retained by bolted caps The bearing assemblies are retained by plastic rings Why must needle bearing assemblies Questio be retained？ n