Analysis of Bearing Cup Assembly Failure in Drive Shaft Assembly
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TECHNICAL ARTICLE—PEER-REVIEWED
Analysis of Bearing Cup Assembly Failure in Drive Shaft Assembly Yogesh Pathak • V. S. Aher
Submitted: 16 September 2012 / in revised form: 3 December 2012 / Published online: 26 January 2013 ASM International 2013
Abstract The automobile is a typical industrial product that involves a variety of materials and technologies. The present societal needs necessitate that metallic materials are ideally suited for applications in heavily stressed components that require high durability. In this study, failure analysis of bearing cup in a drive shaft assembly is carried out, and a detail analysis using QC story methodology was done to find out initially the possible root causes and finally the main root cause. Alternative solutions were identified, and these are validated on an endurance test rig. Chemical analysis and microstructure and hardness tests were carried out on optical microscope and Vickers hardness testing machine to verify the results. Investigation reveals that carbonitriding process gives good result to avoid through hardening of bearing cup assembly, and the problem was thus eliminated by means of cost effective solution. This study can be used for similar applications in industry where wear resistance is preferred and wall thickness of material is low. Keywords Gas carbonitriding Wear Endurance Drive shaft Heat treatment Nitriding
Introduction The automobile is a typical industrial product that involves a variety of materials and technologies. The present
societal needs necessitate that metallic materials are ideally suited for applications in heavily stressed components that require high durability. The degree of functionality and component performance are strongly tied to the effectiveness of the processing technology deployed for a given application. A propeller shaft, or cardan shaft, is a mechanical component for transmitting torque and rotation, normally utilized to connect other components of a drive train, which cannot be connected directly because of distance or the need to allow for relative movement between them. The universal joint is used to transfer drive (power) from one shaft to another when the shafts are inclined (non collinear) to each other [1].
Problem Statement Problem definition is very important step in any problem resolution; it is said that a well-defined problem means that we have reached half way toward problem solving. Bearing cups are assembled with needle rollers and are used in bearing in universal joint kit. The product quality requirement includes high wear resistance at surface and toughness at core. During assembly of the bearing in end yoke, bearing cup failure has occurred. Figure 1 shows exploded view of drive shaft. Figure 2 shows failed bearing cup.
Y. Pathak (&) V. S. Aher Department of Mechanical Engineering, Amrutvahini COE, Sangamner, India e-mail: [email protected]; [email protected]
Analysis of Problem
V. S. Aher e-mail: [email protected]
Cause and effect diagram is also known as Ishi
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