assignment no 1: shaft design - fitstaff.fit.ac.cy/eng.la/amem316/assignment_1 shaft (2014).pdfpage...

Page -1- Subject: Machine Elements I AMEM 316 – AUTO 308 Academic Year: 2014 (Fall Semester) Instructor: Dr. Antonios Lontos ([email protected] ) Assignment No 1: Shaft Design In the following figure a simple gear box with various machine elements and components is presented. Shaft 2 is rotating through gears by shaft 1 which is rotating through two pulleys by an electric motor. The transmission shaft 1 stands on two bearings and the rotational speed is transfer by the belt. The two shafts are made of hot-rolled alloy steel with yield strength σ y =400-600 MPa and σ uts =1200 MPa. The belt transmits (a) …....KW of power at (b) ….... rpm. The belt is prestressed with a ration of (c) …..... The two gears are spur gears with 20 0 pressure angle. The bearing distance for the shaft 1 is (d) L1=….….... mm and for the shaft 2 is (e) L2=…... mm. The output pulley has to be design for (f) Nb=.….... number of belts. For both shaft the safety factor is (g) SF=…..... - Data for each student: (a/a ……....) A. Calculations 1. Calculate the smallest safe shaft diameter for the shaft 1 and 2. Provide a free body diagram and all necessary bending moments and torque diagrams. 2. Calculate the dimensions of the keys and the keyways at shaft 1 and 2 for the two gears and the pulley. 3. Determine the critical speed of rotating shaft 2. B. Drawings and Assembly 1. Make the construction drawings of all different parts (2D). 2. Design the two shafts (Shaft 1 and 2) with all components and explain in details how to make the assembly (Assembly manual). 3. Design two different cross sections of the device with all components (2D). 4. Design the gear box with all components in 3D. VERY IMPORTANT NOTES * Estimate all dimensions that are not given. ** Useful documents: Cover for Assignment , Drawing template example *** You must submit one hard copy and one pdf file with all calculations and drawings

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Page -1-

Subject: Machine Elements I AMEM 316 – AUTO 308

Academic Year: 2014 (Fall Semester)

Instructor: Dr. Antonios Lontos ([email protected])

Assignment No 1: Shaft Design

In the following figure a simple gear box with various machine elements and components is

presented. Shaft 2 is rotating through gears by shaft 1 which is rotating through two pulleys

by an electric motor. The transmission shaft 1 stands on two bearings and the rotational

speed is transfer by the belt. The two shafts are made of hot-rolled alloy steel with yield

strength σy=400-600 MPa and σuts=1200 MPa. The belt transmits (a) …....KW of power at (b) ….... rpm. The belt is prestressed with a ration of (c) …..... The two gears are spur gears

with 200 pressure angle. The bearing distance for the shaft 1 is (d) L1=….….... mm and for

the shaft 2 is (e) L2=…... mm. The output pulley has to be design for (f) Nb=.….... number of

belts. For both shaft the safety factor is (g) SF=…..... - Data for each student: (a/a ……....)

A. Calculations 1. Calculate the smallest safe shaft diameter for the shaft 1 and 2. Provide a free body

diagram and all necessary bending moments and torque diagrams.

2. Calculate the dimensions of the keys and the keyways at shaft 1 and 2 for the two gears

and the pulley.

3. Determine the critical speed of rotating shaft 2.

B. Drawings and Assembly 1. Make the construction drawings of all different parts (2D).

2. Design the two shafts (Shaft 1 and 2) with all components and explain in details how to

make the assembly (Assembly manual). 3. Design two different cross sections of the device with all components (2D).

4. Design the gear box with all components in 3D.