The connecting rod converts the reciprocating motion of piston into the rotating motion of the crankshaft. Generally, it can be seen in three parts, i.e., small end, shank and big end. The connecting rod motion is complex as the small end is reciprocating along cylinder axis and big end is rotating along with the crankpin. The Loads on a connecting rod are categorized as three types namely, Firing load, Inertia load and other loads. The analysis of loads on Connecting Rod by classical method must be carried out for sizing and shaping before going for detailed analysis using the finite element method for both static and dynamic loads. The examples for the classical method are available in the appendix. The analysis for the four load cases namely, Bolt Preload and Bearing and Bush Interference, Gas Pressure Loading, Inertia Loading and Combined Loading is presented. Enhancing the yield strength and fatigue strength is achieved by choice of Materials and heat treatment. Some practical aspects during design like Weight grouping of connecting rods, Push-out force test and Testing of the connecting rod are given. The fracture splitting method for connecting rods is becoming popular as an exercise in cost reduction. The manufacturing process of connecting rod is described in brief. At the end of the chapter various failure modes are described which are borne in mind while designing the connecting rod.
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Authors acknowledge with thanks SAE, Society of Automotive Engineers for granting the permission to use Figs. 13.3 and 13.7 from reference (Wani et al. 2005) through Copyright Clearance Centre, www.copyright.com. They are thankful to “Sulzer Tech. Review and Sulzer Management Limited, Switzerland” for permitting to use the Figs. 13.13, 13.14, 13.15, 13.16 and 13.17 along with the equations in Annexure III from reference (Bremi 1971).
Afzal A, Fatemi A (2004) A comparative study of fatigue behaviour and life predictions of forged steel and PM connecting rods. No. 2004-01-1529. SAE Technical PaperGoogle Scholar
Ashley Steven (1991) Connecting rods that crack by design. Publication, Mechanical Engineering-CIMEGoogle Scholar
Bremi P (1971) Calculation of the stresses and most important deformations on a connecting rod big end with the help of a computer. Sulzer Tech Rev, Switzerland 1:59–64Google Scholar
Dipak S, Khan AM, Jaipuria A (2010) Dynamic load analysis and optimization of a fracture-split connecting rodGoogle Scholar
Kubota T, Iwasaki S, Isobe T, Koike T (2004) Development of fracture splitting method for case hardened connecting rods. No. 2004-32-0064. SAE Technical PaperGoogle Scholar
Pravardhan SS (2004) Dynamic load analysis and optimization of connecting rod. PhD diss., The University of ToledoGoogle Scholar
Pravardhan SS, Ali F (2005) Connecting rod optimization for weight and cost reduction. No. 2005-01-0987. SAE Technical PaperGoogle Scholar
VDI 2230: Systematic calculation of heavy duty bolted joints: joints with one cylindrical boltGoogle Scholar
Wani PR, Dani AD, Reddy PV (2005) Study of connecting rod for high BMEP engines. No. 2005–26-003. SAE Technical PaperGoogle Scholar
Ilia E, Chernenkoff RA (2001) Impact of decarburization on the fatigue life of powder metal forged connecting rods. No. 2001-01-0403. SAE Technical PaperGoogle Scholar
Kuratomi H, Uchino M, Kurebayashi Y, Namiki K, Sugiura S (1990) Development of lightweight connecting rod based on fatigue resistance analysis of microalloyed steel. SAE transactions 487–491Google Scholar
Nakamura S, Mizuno K, Matsubara T, Sato Y (1993) Development of high fatigue strength free machining microalloyed steel for connecting rods. SAE Transactions 858–865Google Scholar
Fatemi A, Zoroufi M, Shenoy P, Afzal A (2005) Comparative durability study of competing manufacturing process technologies. Mechanical, industrial and manufacturing engineering department, The university of toledo, toledo, ohioGoogle Scholar