Project On_Two Wheeler Gear Box Spur Gear Pair Analysis to Find Out Contact Stresses by ANSYS

SYNOPSIS

Project On - Two Wheeler Gear Box Spur Gear Pair Analysis to Find Out Contact Stresses by ANSYS.

Abstract—

                    The gears are used for a wide range of industrial applications. They have varied application starting from textile looms to aviation industries, automobile gear box and machine tool application to transmitting the power. Their function is to convert input provided by prime mover into an output with lower speed and corresponding higher torque. Spur gears are used to transmit the power up to velocity ratio is ten. This phase they induce high stress at the point of contact. A pair of teeth in action is generally subjected to contact stresses causing fatigue failure of gear tooth.

                 The main purpose of this study is to reduce the contact stress of gear by increasing the module of gear. One Spur gear train is selected for analysis. The Contact stress of existing gear train is calculated and compared with fatigue strengths of gear material. If this stress on gears are higher than fatigue strengths means gears are failed due to fatigue. To reduce the contact stress by increasing the module of gear. The contact stress are calculated by Hertz’s Equation and Strain gauge is used for the experimental investigation of the stress field.

Keywords— Spur gear train, Pitting, Hertz’ contact stress, Module, Molding and Ansys.

 

INTRODUCTION—

                    A gear or cogwheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque. Geared devices can change the speed, torque, and direction of a power source. Gears almost always produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. The teeth on the two meshing gears all have the same shape. Two or more meshing gears, working in a sequence, are called a gear train or a transmission. A gear can mesh with a linear toothed part, called a rack, thereby producing translation instead of rotation.

                    The gears in a transmission are analogous to the wheels in a crossed, belt pulley system. An advantage of gears is that the teeth of a gear prevent slippage.

                When two gears mesh, if one gear is bigger than the other, a mechanical advantage is produced, with the rotational speeds, and the torques, of the two gears differing in proportion to their diameters.

                    In transmissions with multiple gear ratios such as bicycles, motorcycles, and cars the term "gear" as in "first gear" refers to a gear ratio rather than an actual physical gear. The term describes similar devices, even when the gear ratio is continuous rather than discrete, or when the device does not actually contain gears, as in a continuously variable transmission.

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