Machine Drawing

270 Machine Drawing

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d:\N-Design\Des18-1.pm5

18.2.6 Piston

A piston is cylindrical in form and reciprocates in a cylinder. The petrol engine piston is generally

die cast in aluminium alloy. It is connected to the small end of the connecting rod by means of a

gudgeon pin. Figure 18.6 shows the details of the petrol engine piston assembly.

(^50) R142
f^48

SPOT^50

FACING

11

f^8046

R30

1

190

16 12

f^48

9

46

20

R56

9

3

R130R142

284

19046

11

f^48

X

9

12

2

18

90

90

18

f^4876118

18

X–X

12

90

76 50

R24

M12 R62^15

12

21 R80

(^78)

R150

118

15 80

6

f^40

M12 DEEP 12

f^48

(^3636270)

5 4

36

f^72

80

X

Sl. No. Name Matl. Qty.

1 2 3 4 5 6 7 8

Rod end

Cover end

Bearing brass

Bolt

Nut

Split cotter

Snug

Leather packing

FS

FS

GM

MS

MS

MS

MS

—

1 1 2 2 2 2 2 2

Parts list

Fig. 18.5 Marine engine connecting rod end