Machine Drawing

Production Drawings 393

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d:\N-Design\Des20-1.pm5

Fig. 20.4 Crank

20.3 EXAMPLE

20.3.1 Petrol Engine Connecting Rod

Connecting rod assembly of a petrol engine, the big end of which is split into two halves is shown

and described in Chapter 19 (Fig. 19.1).

The component drawings of the above assembly are shown in Fig. 20.7, with details of

tolerances, surface finish, etc., as required for production work. The rod and cap are made of

forged steel and machined to close tolerances at both the big end as well as the small end as

shown. The bearing brasses are made of gun-metal, because it has good resistance to corrosion.