A petrol engine inlet valve is spring-loaded. The valve opens at 360 N closes at 220 N, while the corresponding lengths of springs when it is open is 41 mm and when it is closed is 49 mm. The maximum inside diameter of the spring is 25 mm. Assume the shear yield strength in steel as 400 MPa, shear ultimate strength is 643.2 MPa and shear modulus as 80 kN/mm². Assume the helical compression spring has squared and ground ends, minimum factor of safety, n = 1.5 and spring index, C = 5. Determine for shot-peened wires a) initial compression b) coil diameter d using Zimmerli data, Goodman theory and Langer theory. Select standard size of Washburn & Moen wire c) helical diameter D d) number of actual turns, Na and total turns, Nt e) free length
A petrol engine inlet valve is spring-loaded. The valve opens at 360 N closes at 220 N, while the corresponding lengths of springs when it is open is 41 mm and when it is closed is 49 mm. The maximum inside diameter of the spring is 25 mm. Assume the shear yield strength in steel as 400 MPa, shear ultimate strength is 643.2 MPa and shear modulus as 80 kN/mm². Assume the helical compression spring has squared and ground ends, minimum factor of safety, n = 1.5 and spring index, C = 5. Determine for shot-peened wires a) initial compression b) coil diameter d using Zimmerli data, Goodman theory and Langer theory. Select standard size of Washburn & Moen wire c) helical diameter D d) number of actual turns, Na and total turns, Nt e) free length
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Transcribed Image Text:A petrol engine inlet valve is spring-loaded. The valve opens at 360 N closes at 220 N, while
the corresponding lengths of springs when it is open is 41 mm and when it is closed is 49 mm.
The maximum inside diameter of the spring is 25 mm. Assume the shear yield strength in steel
as 400 MPa, shear ultimate strength is 643.2 MPa and shear modulus as 80 kN/mm². Assume
the helical compression spring has squared and ground ends, minimum factor of safety, n = 1.5
and spring index, C = 5. Determine for shot-peened wires
a) initial compression
b) coil diameter d using Zimmerli data, Goodman theory and Langer theory. Select standard size
of Washburn & Moen wire
c) helical diameter D
d) number of actual turns, Na and total turns, Nt
e) free length
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