It is desired to design a valve spring of I.C. engine for the following details:

Question

It is desired to design a valve spring of I.C. engine for the following details: Spring load when valve is closed = 80 N Spring load when valve is open = 100 N Space constraints for the fitment of spring are: Inside guide bush diameter = 24 mm Outside recess diameter = 36 mm Valve lift = 5 mm 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 length of spring: 6. Pitch of the coil when additional 15 percent of the working deflection is used to avoid complete closing of coils. [Ans. 2.9 mm: 10.345; 9: 26.1 mm: 54.85 mm; 7 mm]

Explanation / Answer

SOLUTION: Wire diameter= 2.9*10^-3 m = 2.9 mm Spring Index= 10.345 Total no. of coils= 9 Solid Length of Spring= 26.1 mm Free Length of Spring= 0.05485 m = 54.85 m Pitch= 0.007 m= 7 mm

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.