6.It is desired to design a valve spring of I.C. engine for the following details:(a) Spring load when valve is closed 80 N(b) Spring load when valve is open = 100 N(c) Space constraints for the fitment of spring are :Inside guide bush diameter = 24 mmOutside recess diameter= 36 mm(d) Valve lift 5 mm(e) Spring stcel has the following properties:Maximum permissible shear stress = 350 MPaModulus of rigidity 84 kN/mm?ried: 1 Wire diameter; 2. Spring index; 3. Total number of coils; 4. Solid length of sprine: 5. Free

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6. It is desired to design a valve spring of LC. engine for the following details: (a) Spring load when valve is closed 80 N (b) Spring load when valve is open = 100 N (c) Space constraints for the fitment of spring are: Inside guide bush diameter =24 mm !! Outside recess diameter= 36 mm %3D (d) Valve lift=5 mm (e) Spring stcel has the following properties: Maximum permissible shear stress 350 MPa %3D Modulus of rigidity 84 kN/mm? de 1. Wire diameter; 2. Spring index; 3. Total number of coils; 4. Solid length of spring; 5. Free %3D

6. It is desired to design a valve spring of LC. engine for the following details: (a) Spring load when valve is closed 80 N (b) Spring load when valve is open = 100 N (c) Space constraints for the fitment of spring are: Inside guide bush diameter =24 mm !! Outside recess diameter= 36 mm %3D (d) Valve lift=5 mm (e) Spring stcel has the following properties: Maximum permissible shear stress 350 MPa %3D Modulus of rigidity 84 kN/mm? de 1. Wire diameter; 2. Spring index; 3. Total number of coils; 4. Solid length of spring; 5. Free %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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6. It is desired to design a valve spring of I.C. engine for the following details : (a) Spring load when valve is closed = 80 N (b) Spring load when valve is open = 100 N (c) Space constraints for the fitment of spring are : Inside guide bush diameter = 24 mm Outside recess diameter = 36 mm (d) Valve lift = 5 mm (e) Spring steel has the following properties: Maximum permissible shear stress = 350 MPa Modulus of rigidity = 84 kN/mm? Find : 1. Wire diameter; 2. Spring index; 3. Total number of coils; 4. Solid length of spring; 5. Free Тop
PROBLEM: 5 A helical valve spring is to be designed for an operating load range of 90N to 195N. The maximum deflection of the spring for this load range is 7.5 mm. Assuming a spring index of 9, a permissible shear stress of 550 N/mm2 for the material and the modulus of rigidity of 0.85x105 N/mm2. Determine the dimensions of the spring. (i.e. Diameter of the spring wire ,Mean coil diameter, Outer diameter of the spring, number of active turn and free length of the spring). Assume the spring coil is squared and ground.
1. Design a helical spring for a spring loaded safety valve for the following conditions: Operating pressure Maximum pressure when the valve blows off freely = 1 N/mm? = 1.075 N/mm2 Maximum lift of the valve when the pressure is 1.075 N/mm2 = 6 mm Diameter of valve seat =100 mm Maximum shear stress 400 MPa %3D Modulus of rigidity = 86 kN/mm? Spring index = 5.5 [Ans. d= 17.2 mm; D=94.6 mm; n=12| A vertical epring loaded ualue ia noonin
Required information A helical compression spring is wound using music wire of diameter, d, 2.16 mm. The spring has an outside diameter, OD, of 27 mm with plain ground ends and 14 coils. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. What is the force needed to compress this spring to closure assuming that the spring will reach its shear strength at its solid length? The force needed to compress this spring to closure is |N.
O1: Valve diameter = 60 mm A safety valve is loaded by a tension type close coiled helical spring having the following data: Minimum pressure on valve = 0.7 Mpa Maximum pressure at blow off = 0.78 Mpa Valve lift = 3 mm Spring index = 6 Modulus of rigidity = 81370 N/ mm2 Permissible shear stress = 600 N/ mm? Design the spring.
- In a compound helical spring, the inner spring is arranged within and concentric outer one but is 10 min shorter. The outer spring has 10 coils of mean diaineter 30 min and wire dia 3 mm. Find stiffness of inner spring if an axial load of 100 N causes outer one to compress by 20 mm. If the radial clearance between the springs is 2 mm, find wire diameter of inner spring which has 8 coild. G 80 kN/mm.
3. Design a helical spring for a spring loaded safety valve for the following conditions : Operating pressure Maximum pressure when thc valve blows off freely = 1 N/mm? = 1,075 N/mm? Maximum lift of the valve wvhen the pressure is 1.075 N/mm2 6 mm %3D Diameter of valve seat = 100 mm Maximum shear stress 400 MPa Modulus of rigidity = 86 kN/mm² Spring index [Ans. d= 17.2 mm; D=94.6 mm ; n = 12] 5.5 %3D
Required information A helical compression spring is wound using music wire of diameter, d, 2.16 mm. The spring has an outside diameter, OD, of 27 mm with plain ground ends and 14 coils. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. What should be the free length to ensure that the torsional stress does not exceed the yield strength when the spring is compressed solid? What is the critical free length? Is there a possibility that the spring might buckle in service? The free length should be |mm. The critical free length should be Buckling is likely Eto occur. mm.
A typical compound helical spring consists of two coaxial closed coil spring having the following particulars: Outer spring 1: Mean coil diameter = 100mm Wire diameter = 12.5 mm No. of turns = 15 Inner spring 2: Mean coil diameter = 75 mm No. of turns = 20 Both the springs are of equal initial length when unloaded. If the working stress for each spring is to be the same. The modulus of rigidity for the wire material is 80 GPa. Calculate the following: a. Diameter of steel wire for inner spring b. Stiffness of inner spring c. Stiffness of the compound spring
1. Design a compression helical spring to cary a load of 500 N with a deflection of 25 mm. The spring index may be taken as 8. Assume the following values for the spring material: Permissible shear stress 350 MPa Modulus of rigidity = 84 kN/mm2 4C – 1 + 4C – 4 0.615 Wahl's factor -, where C= spring index. [Ans. d= 5.893 mm; D=47.144 mm; n 6]
A helical compression spring is made with oil-tempered wire of diameter 0.2", mean coil diameter of 2", 12 total coils, 5" free length, and squared ends. (a) Find the solid length. (b) Find the force required to compress the spring to closure? (c) Find the factor of safety against yield when compressed to the solid length. (Hint: Uses Say= 0.5 Sut for shear strength.)
PROBLEM: 7 Calculate the dimensions of helical spring for a spring loaded safety valve from the following data : Valve Diameter = 45 mm; operating pressure = 0.6 N/mm2 Maximum pressure when the valve blows off freely = 0.99 N/mm2 ;valve lift when pressure rises from 0.6 to 0.99 N/mm2 = 5.5 mm ;Maximum permissible stress = 555 N/mm2 ; spring index ,C = 9; Modulus of rigidity =0.85x 105 N/mm2. Assume the spring coil is squared and ground.