Paper id 26201454

Page 1

International Journal of Research in Advent Technology, Vol.2, No.6, June 2014 E-ISSN: 2321-9637

Design and Fabrication of a Fixture for Differential Carriers R149.5 and R149.7 Chetan Appasab Chougale1, Kiran K2, Rajgopal3, Anantharaja M H4 PG Scholar, Department of Machine Design, Dept. of PG Studies, VTU Gulbarga-585 1051 PG Scholar, Department of Thermal Power Engineering, Dept. of PG Studies, VTU Gulbarga-585 1052,3,4 Visvesvaraya Technological University, Belgaum, Karnataka-590 018. chetanchougule.a10@gmail.com1, kirankavalli@gmail.com2, rajgopal7@yahoo.com3, anantharajamh@gmail.com4 Abstract: At present scineario productivity and economics of machining work pieces in a large quantity is greatly affected with the use of work holding devices like fixtures. This device reduce the production cost and ensure interchangeability of machined work pieces. In the present study R149.5 and R149.7 are the different kinds of differential carriers of ASHOK LEYLAND used. A differential carrier is a casing or cage which carries differential gears. These differential gear arrangement permits transmission of power from the engine to a pair of driving wheels and distributes the force equally between them but permitting them to follow different path lengths during turning a corner or traversing an uneven road. But on straight road the wheels rotate at the same speed. To achieve required accuracy with reduced rework and easy handling fixtures are provided. Our research methodology aims at optimal design and fabrication of fixture. The fixture is designed and fabricated mainly to get the dimension of workpieces within tolerance limit. Index Terms: Fixture, Differential carrier, Ashok Leyland, R149.5, R149.7. 1. INTRODUCTION 1.1. Differential Carriers A differential is a particular type of simple planetary gear train that has the property that the angular velocity of its carrier is the average of the angular velocities of its sun and annular gears. The differential carrier principle can be accomplished by packaging the gear train so it has a fixed carrier train ratio R = -1, which means the gears corresponding to the sun and annular gears are the same size, which can be done by engaging the planet gears of two identical and coaxial epicyclic gear trains to form a spur gear differential. A similar approach is to use bevel gear differential consisting of bevel gears for the sun and annular gears and a bevel gear as the planet.[1] A differential couples the drive shaft to half-shafts that connect to the rear driving wheels of automobiles and other wheeled vehicles. During turning the differential gear enables the outer drive wheel to rotate faster than the inner drive wheel. This is most essential during the vehicle turning, which makes the outer wheel of the turning curve roll farther and faster than the other. The average of the rotational speed of the two driving wheel equals the input rotational speed of the drive shaft. Which is accomplished by increasing in the speed of one wheel is balanced by a decreasing in the speed of the other.[1]

Fig. 1. A spur gear differential constructed by engaging the planet gears of two co-axial epicyclic gear trains. The casing is the carrier for this planetary gear train.

Fig.2. 1. Adjusting Nut Lock (aka Adjusting Nut Retainer) 2. Adjusting Nut 3. Carrier (in this case, a mighty 14-bolt ARB Air Locker) A differential consists of one input drive shaft with two drive wheels as output. However the rotation of

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