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Rathi, Hemantkumar
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An alternate cost effective material for rocker arm used in heavy commercial vehicles

VE Commercial Vehicles Ltd-Kaarthic Kaundabalaraman, Suresh Kumar Kandreegula, Hemantkumar Rathi
VE Commercial Vehicles, Ltd.-Sonu Paroche
  • Technical Paper
  • 2019-28-2550
To be published on 2019-11-21 by SAE International in United States
Rocker arm in internal combustion engine is very important part which transfer the cam motion and force to the valve. In heavy commercial vehicles, the engine components are design for an infinite life (considerable higher than other components). Recently industries are working for light weight and optimized cost material. Hence it is required to have an optimized cost effective design of rocker arm without affecting its performance. A rocker arm should meet the stiffness and strength requirement. The objective of this study is to find out the alternate material for rocker arm which can provide the similar strength & stiffness as conventional rocker arm material. To achieve the performance and cost target, alternate material cast iron has been evaluated for rocker arm. Cast iron is lighter than the forged steel rocker arm, also it has a good frictional characteristic. Further bush is eliminated from the rocker arm assembly due to self-lubricant property of the cast iron rocker arm. This is significant reduce in cost of material and assembly procedure. A 2-d simulation and finite element…
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Design Analysis & Parametric Optimization of Gerotor Oil Pump for Improving Volumetric Efficiency

VE Commercial Vehicles Ltd.-Anurag Kamal, Kaarthic Kaundabalaraman, Hemantkumar Rathi, Alok Muley
Published 2016-02-01 by SAE International in United States
This work is an effort to find the parallelism between the volumetric efficiency of a Gerotor, and its inherent design parameters: number of teeth, tooth profile, outer dimensions of diameter and thickness, and the input power (torque and speed). The preliminary relations are derived from the software simulation of a range of Gerotor models with varying aforementioned parameters. These results are augmented by a previously proposed method of theoretically estimating the displacement of a Gerotor. Then, these results are validated and revised by practical results from three different Gerotors with epitrochoidal and its conjugate profiles, which are used in automotive applications like engines and transmissions. These relations can be used for choosing parameters yielding the maximum efficiency in specific environments: the packaging space, the input available, and the output required. Finally, an attempt has been made to develop a theoretical formula of the efficiency of a Gerotor in light of the above parameters. According to these results, a prototype Gerotor is proposed and will be validated for its performance.
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Design Optimization of Powertrain Mounts for Vibration Isolation on Heavy Commercial Vehicle (HCV) Six Cylinder Inline Diesel Engine

VE Commercial Vehicles, Ltd.-Gaurav Paliwal, Naveen Sukumar, Umashanker Gupta, Saurav Roy, Hemantkumar Rathi
Published 2015-01-14 by SAE International in United States
The main emphasis for a commercial vehicle design which was focused on fuel-economy and durability does not fulfill the increasing customer expectations anymore.Commercial vehicle designers need to focus on other vehicle aspects such as steering, ride comfort, NVH, braking, ergonomics and aesthetics in order to provide car like perception to truck, bus drivers and passengers during long distance drives.Powertrain mounting system must perform many functions. First and foremost, the mounting system must maintain & control the overall motion of the powertrain, to restrict its envelope reasonably, thereby avoiding damage to any vehicle component from the potential impact. This requires the mount to be stiff.Second the mount must provide good vibration isolation to have a comfortable ride to the vehicle occupant. This requires the mount to be soft.These requirements contradict each other & hence a suitable “Tradeoff” is needed for achieving the rigid body mode targets for a comfortable vehicle ride and also restraining the powertrain motions within vehicle packaging constraints.
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