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The reciprocating piston petrol engine
Published in M.J. Nunney, Light and Heavy Vehicle Technology, 2007
The gudgeon pin is the vital mechanical link that hinges the piston to the connecting rod and, although it is of deceptively simple appearance, it must be recognized as being a precision engineered component. This is because it has to satisfy several conflicting requirements; namely, it must combine strength with lightness, be close fitting but with freedom to move, and resist wear without promoting scuffing. The gudgeon pin is of hollow construction and typically produced from a fine-grained plain carbon steel with controlled hardenability. It is lapped to a mirror finish of 0.05–0.10 (2–4 in). The diameter of the gudgeon pin may be up to 40 per cent of the piston diameter, so that maximum bearing pressure in the piston bosses does not exceed 55 MN/m2 (8250 lbf/in2). Under load its ovality and longitudinal bending are not expected to exceed 0.025 mm (0.001 in) and 0.075 mm (0.003 in) respectively. The methods used for gudgeon pin location depend on whether the arrangement is a semi-floating or fully floating one.
Engine systems
Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018
The piston pin or gudgeon pin bore is machined into the piston to accept the piston pin, also known as the gudgeon pin (Fig. 2.67). The fixing mechanism of the piston pin to the piston and the connecting rod can vary (Fig. 2.68). It can be an interference fit in the connecting rod, or a push fit in both the piston and connecting rod end. If the piston pin is clamped in the connecting rod, the piston pin bore is smooth (Fig. 2.69). Circlip grooves are formed in the piston pin bore when a push fit piston pin is used.
Thermoelastic fracture analysis in orthotropic media using optimized element free Galerkin algorithm
Published in Mechanics of Advanced Materials and Structures, 2022
Connecting rod is the basic component of the engine mechanism that converts straight line motion of piston to rotary mechanism. This rod is connected to piston at small end by gudgeon pin while big end is connected to crankshaft. This engine component is subjected to elevated pressure and loads resulting in generation of thermal and mechanical stresses. Any surface or embedded crack in connecting rod is highly susceptible to cause failure owing to thermoelastic loading. Thus, the fracture analysis of such essential engine components becomes very significant [54, 55]. In this section, the proposed EFGM algorithm is utilized to perform stress analysis of a cracked connecting rod having orthotropic properties subjected to thermoelastic loads.