Mechanical springs
It is required to design a valve spring of IC Engine with following details:
Spring load = 80 N, When valve is closed
Spring load = 100 N, When valve is open
Space constraints for spring fitment are :
Inside guide bush diameter = 24 mm
Outside recess diameter = 36 mm
Valve lift = 5mm
Spring steel has following properties :
Ultimate tensile strength = 700 N/mm2
Modulus of rigidity = 8.4 × 10^4 N/mm2
Spring ends are square and ground.
Permissible shear stress for spring wire = 0.5 Sut.
Determine: Wire diameter, Spring index, Total number of coils . Solid length, Free length. Pitch of the coil when additional 15 % of working deflection is used to avoid complete closing of coil.
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6. It is desired to design a valve spring ofLC. engine for the following details (a)...
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Machine Desgin course related Machine Design related, shigley's mechanical engineering 4. A compression spring is needed...
Machine Desgin course related
Machine Design related, shigley's mechanical engineering
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Two concentric springs have a solid length of 50 mm. When they are subjected to an axial load of N the maximum deflection is found to be 40 mm The springs are made of the same material and wire diameter for both are same. The maximum issible shear stress is 160 MPa. Determine the load shared by each spring and the wire diameter it the inner spring diameter is 120 mm and the radial arance is 2.5 mm. Rigidity modulus...
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Problem 1 The mass center of the 1.5 kg link OC is located at G, and the spring of constant k=200 N/m is unstretched when = 0. 1. What is the free length of the spring Lo 2. What is the maximum deflection for the spring under the service load. 3. You are required to design an extension spring AB, thus, if a hard drawn steel A227 Peened Spring is going to be selected with the following constrains: • Coil...
Machine Desgin course related
Machine Design related, shigley's mechanical engineering
4. A compression spring is needed to fit over a 12mm diameter rod. To allow for some clearance, the inside diameter of the spring is to be 15mm. To ensure a reasonable coil, use a spring index of 8. The spring is to be used in a machine by compressing it from a free length of 125mm through a stroke of 75 mm to its solid length. The spring should...
1. A closely coiled helical spring made of 15 mm diameter steel
wire has 15 coils of 110 mm mean diameter. The spring is subjected
to an axial load of 180 N. Calculate the maximum shear stress
induced in the spring. Assume modulus of rigidity is 78 GPa.
2. A solid circular bar ABC consists of two segments, as shown
in the figure. One segment has diameter d1= 65 mm and
length L1 = 1.54 m; the other segment has...
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