We know that the radial thickness of the piston rings

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Unformatted text preview: = 16 / 3 to 16 / 2 = 5.33 to 8 mm Let us adopt tR = 7 mm Ans. 3. Piston rings Let us assume that there are total four rings (i.e. nr = 4) out of which three are compression rings and one is an oil ring. We know that the radial thickness of the piston rings, t1 = D 3 pw 3 × 0.035 = 100 = 3.4 mm σt 90 ...(Taking pw = 0.035 N/mm2, and σt = 90 MPa) and axial thickness of the piston rings t2 = 0.7 t1 to t1 = 0.7 × 3.4 to 3.4 mm = 2.38 to 3.4 mm Let us adopt t2 = 3 mm 1142 n A Textbook of Machine Design We also know that the minimum axial thickness of the pistion ring, 100 D = = 2.5 m m 10 n r 10 × 4 Thus the axial thickness of the piston ring as already calculated (i.e. t2 = 3 mm)is satisfactory. Ans. The distance from the top of the piston to the first ring groove, i.e. the width of the top land, b1 = tH to 1.2 tH = 16 to 1.2 × 16 mm = 16 to 19.2 mm and width of other ring lands, b2 = 0.75 t2 to t2 = 0.75 × 3 to 3 mm = 2.25 to 3 mm Let us adopt b1 = 18 mm ; and b2 = 2.5 mm Ans. We know that t...
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