5. 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/mm² Find : 1. Wire diameter; 2. Spring index; 3. Total number of coils; 4. Solid length of spring; 5. Free

5. 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/mm² Find : 1. Wire diameter; 2. Spring index; 3. Total number of coils; 4. Solid length of spring; 5. Free

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter2: Axially Loaded Members

Section: Chapter Questions

Problem 2.8.11P: A bumper for a mine car is constructed with a spring of stiffness k = 1120 lb/in. (see figure). If a...

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A small lab scale has a rigid L-shaped frame ABC consisting of a horizontal aim AB (length b = 30 cm) and a vertical arm BC (length c = 20 cm) pivoted at point B. The pivot is attached to the outer frame BCD that stands on a laboratory bench. The position of the pointer at C is controlled by two parallel springs, each having a spring constant k = 3650 N/m. that are attached to a threaded rod. The pitch of the threads is p = 1.5 mm. If the weight is 65 N. how many revolutions of the nut are required to bring the pointer back to the mark?
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.
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.
A helical compression spring with square and ground ends has an outside diameter of 14 mm, 20 total coils, a wire diameter of 2 mm, and a free length of 105 mm. Calculate the spring index, the pitch, the solid length, and the shear stress in the wire when the spring is compressed to its solid length.
A square end compression helical spring has an operation load range of 3.5KN to 4.2KN.The deflection for the load range is 8mm and the spring index is 6.if the permissible shear stress and module of rigidity for the material of the spring are 380MPa and 90pa respectively, including the effect of the wire curvature. Design the spring by, determine (A)wire diameter (B) mean coil diameter (C) number of active turns (D)total number of turns
5.2 In a compound helical spring, the inner spring is concentric with the outer spring, but is 9 mm shorter. The outer spring has ten coils of mean diameter 24 mm, and the wire diameter is 3 mm. Find the stiffness of the inner spring if an axial load of 150 N causes the outer spring to compress 18 mm. If the mean coil diameter for the inner spring is 15.94 mm, find the wire diameter of the inner spring when it has eight coils. Both the springs are made of the same material having G = 77 GPa.
Problem 3: A helical spring is designed to have a stiffness of 500 N/m. The spring has a wire diameter of 5 mm and an outer diameter of 30 mm. Determine the number of coils required for the spring if the spring index is 6. Problem 4: A helical spring is compressed by a force of 100 N, resulting in a compression length of 20 cm. The spring has a wire diameter of 3 mm and a mean coil diameter of 15 cm. Determine the spring constant (stiffness) of the spring.
A helical spring is made of 10 m diameter steel wire wound on a 100 mm diameter mandrel. If there are 10 active coils what is spring constant Take: C= 100 GPA What force must be applied to the spring to elongate it by 50 mm?
A helical compression spring is 1o exert a force of 8.0 Ib when compressed 1o a length of 1.75 in. At a length of 1.25 in, the force must be 12.0 Ib. The spring will be installed in a machine that cycles slowly. and approximately 200 000 cycles total are expected. The tem- perature will not exceed 200°F. The spring will be installed in a hole having a diameter of 0.75 in. For this application. specify a suitable material, wire diameter. mean diameter. OD. ID. free length, solid length. number of coils, and type of end condition. Check the stress at the maximum operating load and at the solid length condition. The first of two solution procedures will be shown. The numbered steps can be used as a guide for future problems and as a Kind of algorithm for the spreadsheet approach that follows the manual solution.
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