- A Construct A Piston Pin Made Of Hardened Steel Alloy For A Single Acting Single Cylinder Four Stroke Engine Based On 1 (84.6 KiB) Viewed 51 times
a) Construct a piston pin made of hardened steel alloy for a single acting, single cylinder four stroke engine based on the operational data in Table 1. Assume the bearing pressure at the small end is 25 N/mm². And assume that the relation between lengths of the pin inside the small end of the connecting rod is equal to 0.45 diameter of the bore. The ratio of the inside diameter to the outside diameter of the pin can be taken as 0.6. b) Prove that the design is safe by using bending stress method. Use maximum allowable bending stress of 140 MPa. If a stronger material is use for the construction of the pin, what will happen to the calculated size of the pin? Table 1: Engine information for piston pin design Specification Engine speed, N (rpm) (12 Marks) [CO1, PO2, C4] c) Analyse and discuss the common failure mode of the piston pin based on the free body diagram of the forces and moment acting on its body. Cylinder stroke, S (mm) Cylinder bore, B (mm) Maximum cylinder gas pressure, p (N/mm²) Indicated mean effective pressure, imep (N/mm²) Mechanical efficiency, mech (%) Fuel consumption (kg/kWh) Higher heating values, HHV (MJ/kg) (8 Marks) [CO2, PO2, C4] (5 Marks) [CO2, PO2, C4] Values 2000 120 100 6 0.75 80 0.16 42