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Unformatted text preview: ton end is kept as 0.75H to 0.9H. Let us
Depth near the big end,
H1 = 1.2H = 1.2 × 35 = 42 mm
and depth near the small end,
H2 = 0.85H = 0.85 × 35 = 29.75 say 30 mm
∴ Dimensions of the section near the big end
= 42 mm × 28 mm Ans.
and dimensions of the section near the small end
= 30 mm × 28 mm Ans.
Since the connecting rod is manufactured by forging, therefore the sharp corners of I-section
are rounded off, as shown in Fig. 32.14 (b), for easy removal of the section from the dies.
2. Dimensions of the crankpin or the big end bearing and piston pin or small end bearing
Let dc = Diameter of the crankpin or big end bearing,
lc = length of the crankpin or big end bearing = 1.3 dc
N/mm2 ...(Given) pbc = Bearing pressure = 10
We know that load on the crankpin or big end bearing
= Projected area × Bearing pressure
= dc .lc . pbc = dc × 1.3 dc × 10 = 13 (dc)2
Since the crankpin or the big end bearing is designed for the maximum gas force (FL), therefore,
equating the load on the crankpin or big...
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- Spring '11