上海交通大学：《工程学导论》课程教学资源（讲义）Technical knowledge_6shafs

Shafts and Associated Parts 轴和轴系零件 Introduction to Engineering

1 Introduction to Engineering Shafts and Associated Parts 轴和轴系零件

Shaft >A relatively long component >Usually with round cross section >Usually rotates and transmits power >Used to put one or more components such as gears, pulleys(皮带轮)，and cams) together by means of pins,keys etc. Introduction to Engineering

2 Introduction to Engineering Shaft A relatively long component Usually with round cross section Usually rotates and transmits power Used to put one or more components ( such as gears, pulleys（皮带轮）, and cams) together by means of pins, keys, etc

>A shaft can also have a non-round cross section, and it need not rotate >An axle(心轴)isa shaft,either stationary or rotating,not subjected to torsion load >A short rotating shaft is often called a spindle 轴) Introduction to Engineering

3 Introduction to Engineering A shaft can also have a non-round cross section, and it need not rotate An axle （心轴）is a shaft, either stationary or rotating, not subjected to torsion load A short rotating shaft is often called a spindle（主 轴）

Elements Attached to a Shaft Frame Frame Sheave Bearing Shaft Gear Pulley Shoulders(轴肩)provide axial positioning location Introduction to Engineering

4 Introduction to Engineering Elements Attached to a Shaft Shoulders（轴肩） provide axial positioning location

Mounting Parts onto Rotating Shafts >Parts are made separately and then mounted onto the shaft >The portion of the mounted i member in contact with the shaft is the hub(毂盘) >The hub is attached to the shaft in a variety of ways Introduction to Engineering

5 Introduction to Engineering Mounting Parts onto Rotating Shafts Parts are made separately and then mounted onto the shaft The portion of the mounted member in contact with the shaft is the hub（毂盘） The hub is attached to the shaft in a variety of ways

Keys(键)&Keyways(键槽) ©DIFFLOCK.com Keys are the most common of torque- transmitting shaft-to-hub connections The grooves in the shaft and hub into which the key fits are called keyways or keyseats 6 Introduction to Engineering

6 Introduction to Engineering Keys（键） & Keyways（键槽）  Keys are the most common of torque￾transmitting shaft-to-hub connections  The grooves in the shaft and hub into which the key fits are called keyways or keyseats

Pin(销) A simple attachment for transmitting relatively light loads is provided by pins Pins provide a relatively inexpensive means of transmitting both axial and circumferential loads Straight Tapered split tubular spring 圆柱销 圆锥销 开口管状弹簧 (a) (c) Introduction to Engineering

7 Introduction to Engineering Pin （销）  A simple attachment for transmitting relatively light loads is provided by pins  Pins provide a relatively inexpensive means of transmitting both axial and circumferential loads Straight Tapered split tubular spring 圆柱销 圆锥销 开口管状弹簧

Setscrew (紧钉螺钉 >To prevent relative motion of components and shafts >Two screws are commonly used,spaced 90°apart >Inexpensive and sometimes adequate for relatively light loads >Sometimes used in Rotating Shaft and Pulleys with Projecting Key and Set Screw conjunction with keys Introduction to Engineering

8 Introduction to Engineering Setscrew（紧钉螺钉） To prevent relative motion of components and shafts Two screws are commonly used, spaced 90°apart Inexpensive and sometimes adequate for relatively light loads Sometimes used in conjunction with keys Rotating Shaft and Pulleys with Projecting Key and Set Screw

Retaining rings(卡圈) >Retaining rings commonly called snap rings >Axially positioning and retaining hubs and bearings onto shafts >Requiring grooves on the shaft that weaken the shaft >Should be located where stresses are low Introduction to Engineering

9 Introduction to Engineering Retaining rings（卡圈） Retaining rings commonly called snap rings Axially positioning and retaining hubs and bearings onto shafts Requiring grooves on the shaft that weaken the shaft Should be located where stresses are low

Front Working Angle Rear Working Angle Couplings(联轴器) 10 Introduction to Engineering

10 Introduction to Engineering Couplings（联轴器）