FEA CILINDRO.pdf - IOSR Journal of Mechanical and Civil Engineering(IOSR-JMCE e-ISSN 2278-1684,p-ISSN 2320-334X Volume 14 Issue 3 Ver VII(May June 2017

FEA CILINDRO.pdf - IOSR Journal of Mechanical and Civil...

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IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 14, Issue 3 Ver. VII (May - June 2017), PP 47-53 DOI: 10.9790/1684-1403074753 47 | Page Design and Analysis of Piston Rod Joint in Hydraulic Cylinder for Industrial Implements M. Antony Maria Thomas Benny 1 , U.S. Chavan 2 1 (Department of Mechanical Engineering, Vishwakarma Institute of Technology, Pune, India 411037) 2 (Department of Mechanical Engineering, Vishwakarma Institute of Technology, Pune, India 411037) Abstract: As heavy engineering industries grows so is the implements and necessity for more powerful mechanisms to actuate theses implements. Hydraulic cylinders are one such actuators that generates linear translatory motion. Hydraulic cylinder force required for actuation depends on implement requirements and in heavier applications were output forces needed are higher, the internal components of the cylinder needs to withstand this higher loads and hence the design of hydraulic cylinder internal components gains importance. The cylinder rod and piston inside the cylinder are connected jointly either by bolt or nut. This paper concentrates more on these joints which experiences higher tensile or compressive loads during operations. There are instances during implement operation, when the cylinder reciprocates and reaches its extreme fully open position. When there is no more stroke available, the cylinder bottoms-up completely putting high tensile load on the rod and piston-rod joint which may even lead to failure of these joint and cylinder. In this analysis, a static structural analysis was performed on three synthesized cylinder rod-piston joints to investigate different loads that come on these joints and which is best suitable joint for industrial implements with high tensile and preload loads. Keywords: Hydraulic cylinder joint, piston-rod joint, bolt preload analysis, cylinder bottom-up. I. Introduction A hydraulic cylinder is a complicated mechanical system that are used to provide linear force action and motion. Hydraulic cylinders are powered from externally pressurized hydraulic fluid. They are commonly used in equipment’s and machinery, such as construction equipment l ike excavators, dozers and material handling equipment’s like carry cranes, telescopic trucks etc. [1 -2, 6] It consists mainly of cylinder barrel, piston and cylinder rod. The piston that is placed within the barrel is connected to the cylinder rod either by bolt or nut. The piston reciprocates producing linear force with compression and tension forces perfectly align in the rod’s axial direction. In the majority of applications, where bolts and nuts are used, it is the clamping force provided by torqueing of the bolt/nut plays major role which is crucial factor in determining the structural integrity of the joint [7]. The wrong tightening is one of the most frequent causes of ductile rupture and a frequent cause of fatigue failure [9].
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