Unformatted text preview: wing stresses:
(i) Bending stresses in two planes normal to each other, due to the radial and tangential
components of FQ,
(ii) Direct compressive stress due to FR, and
(iii) Torsional stress.
The bending moment due to the radial component of FQ is given by,
Te = l
t MR = H R2 b1 − c − 2 2 We also know that MR = σ b R × Z = σ b R × ... (i) 1
× w .t 2
6 ... (ii) Internal Combustion Engine Parts n 1169 σbR = Bending stress in the radial direction, and
Z = Section modulus = × w · t
From equation (i) and (ii), the value of bending stress σbR is determined.
The bending moment due to the tangential component of FQ is maximum at the juncture of
crank and shaft. It is given by d s1 MT = FT r − 2 ... (iii) where
ds1 = Shaft diameter at juncture of right hand crank arm, i .e. a t
We also know that MT = σbT × Z = σbT × × w. t 2
σbT = Bending stress in tangential direction.
From equations (iii) and (iv), the value of bending stress σbT is d...
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- Spring '11
- Combustion, Internal combustion engine, pistons, Connecting rod, Engine technology, piston pin