圈上海夫通大华 西+口 LECTURE 9 ME371/ME337 DESIGN AND MANUFACTURING Threaded Fasteners Covered: 8 in Mechanical Engineering Design SHAN 圆上海文通大学 Lectures Power/Energy Conversion (Electrical Motors) Power/Energy Transmission (Gears,Cam,Linkage, Belt Drives, Power Screws) Transmission Joints (Fasteners, Support Connectors) (Bearings) Structural Support (Frames) Tools Statics,Dynamics, Stress Analysis,etc. 1
1 Threaded Fasteners LECTURE 9 Covered: 8 in Mechanical Engineering Design ME371/ME337 DESIGN AND MANUFACTURING Lectures Power/Energy Conversion (Electrical Motors) Transmission Support (Bearings) Joints (Fasteners, Connectors) Structural Support (Frames) Tools Statics, Dynamics, Stress Analysis, etc. Power/Energy Transmission (Gears, Cam, Linkage, Belt Drives, Power Screws)
圆上泽文大学 OUTLINE © Threaded Fasteners introduction ©Stiffness Analysis ©Strength Analysis ©Fatigue Analysis 圈上泽夫道大学 Classification by intended use Bolt:when it is intended to be used with a nut to clamp an assembly together.The bolt remains stationary while nut is torqued. Screw:when it is threaded into a tapped hole rather than used with a nut.Screw is torqued into place. 2
2 Threaded Fasteners introduction Stiffness Analysis Strength Analysis Fatigue Analysis OUTLINE Classification by intended use Bolt : when it is intended to be used with a nut to clamp an assembly together. The bolt remains stationary while nut is torqued. Screw: when it is threaded into a tapped hole rather than used with a nut. Screw is torqued into place
圈上海文通大华 Types of Threaded Fastener ▣Bolt(螺栓)：Threaded fastener designed to pass through holes in the mating members and to be secured by tightening a nut from the end opposite the head of the bolt. (a) (b) 圆上泽夫通大学 Types of Threaded Fastener 口Screws(螺钉)：Threaded fastener designed to be inserted through a hole in one member to be joined and into a threaded hole in a mating member. 3
3 Types of Threaded Fastener Bolt(螺栓): Threaded fastener designed to pass through holes in the mating members and to be secured by tightening a nut from the end opposite the head of the bolt. Screws(螺钉): Threaded fastener designed to be inserted through a hole in one member to be joined and into a threaded hole in a mating member. Types of Threaded Fastener
圈上泽文通大华 Types of Threaded Fastener 口Stud螺柱)：Fastener similar to a bolt.It is attached permanently to a part of one member to be joined.The mating member is then placed over the stud and a nut is tightened to clamp members 圆上清支大华 Types of Threaded Fastener 口Set Screws(定位螺钉)：Headless fasteners designed to bear directly on mating part locking it into place.Depends on compression. (a) (b) 4
4 Stud(螺柱): Fastener similar to a bolt. It is attached permanently to a part of one member to be joined. The mating member is then placed over the stud and a nut is tightened to clamp members Types of Threaded Fastener Set Screws(定位螺钉): Headless fasteners designed to bear directly on mating part locking it into place. Depends on compression. Types of Threaded Fastener
圈上泽文通大华 Types of Threaded Fastener 口Set Screws(定位螺钉)：Example of set screws with different head and point styles applied to hold a collar(齿轮颈)ona shaft. ⊕ Figure 18-12 Set Screws with Different Head and Point Styles Applied to Hold a Collar on a Shaft (R.P.Hoelscher,et al..Graphics for Engi .New York: lohn Wiley Sons,1968) Set © 上海充廷大学 Questions for discussion What is the advantage and disadvantage of the Bolt, Screws,the Stud and Set Screws in different working condition？ What is the functional difference between them? Can you please list some examples for the above questions？ 5
5 Set Screws(定位螺钉):Example of set screws with different head and point styles applied to hold a collar (齿轮颈) on a shaft. Types of Threaded Fastener Questions for discussion What is the advantage and disadvantage of the Bolt , Screws，the Stud and Set Screws in different working condition? What is the functional difference between them? Can you please list some examples for the above questions?