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Unformatted text preview: e bending moment on the shaft is maximum and the
twisting moment is zero. Internal Combustion Engine Parts n 1163 Fig. 32.16. Centre crankshaft at dead centre. Consider a single throw three bearing crankshaft as shown in Fig. 32.16.
D = Piston diameter or cylinder bore in mm,
p = Maximum intensity of pressure on the piston in N/mm2,
W = Weight of the flywheel acting downwards in N, and
*T1 + T2 = Resultant belt tension or pull acting horizontally in N.
The thrust in the connecting rod will be equal to the gas load on the piston (FP ). We know that
gas load on the piston,
FP = 4 × D × p
Due to this piston gas load (FP) acting horizontally, there will be two horizontal reactions H1
and H2 at bearings 1 and 2 respectively, such that
Fp × b1
Fp × b2
; and H 2 =
Due to the weight of the flywheel (W) acting downwards, there will be two vertical reactions V2
and V3 at bearings 2 and 3 respectively, such that W × c1
W × c2
; and V3 =
Now due to the resultant belt tension (T1 + T2), acting horizontally, there will be two horizontal
reactions H2′ and H3′ at bearings 2 and 3 respectively, such that
(T + T2 ) c1
(T + T2 ) c2
; and H 3′ = 1
H 2′ = 1
The resultant force at bearing 2 is given by
V2 = R2 =
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.
- Spring '11