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My Theory on 7 Speed Gear Gear Manual.


The earliest form of a manual transmission is thought to have been invented by Louis-René Panhard and Emile Levassor in the late 19th century. This type of transmission offered multiple gear ratios and, in most cases, reverses. Almost all automobiles as of today are driven by internal combustion engines because of the high power to weight ratio, relatively good efûciency and compact energy storage associated with it. The major disadvantage with this engine is it’s incapability of producing torque from the rest, which is the characteristic of ideal traction hyperbola. This difference between characteristics curve of the combustion engine and the ideal traction hyperbola can be approximated by the use of a gear box. In this paper a gear box with 7 forward gears and 2 reverse gears has been described. A normal 7 speed MT requires 8 gear pairs to provide 7 forward and 1 reverse gear but this paper presents a novel 7 speed MT designed with just 6 gear pairs giving 7 forward and 2 reverse gears thereby saving both the material cost as well as meeting the space constraints.

Automobiles are one of the most trusted and popular means of transportation available in the world. With the invention of IC engines, the application of automobile for transportation has increased significantly contributing greatly towards a developing civilization. Cheap transportation cost with safety in driving, makes automobile as one of the best means available for industrial applications. With more development in industrial sector the numbers of automobiles in the road are also increasing rapidly. But with the energy crisis, fluctuating price of the petroleum fuels and environmental damage caused by the automobiles, continuous research and development work is going on to improve the overall vehicle efficiency.

In a developing country like India where people are very much cost conscious, latest technology such as hybrid and electric vehicles are not the immediate solution. If the conventional vehicle is considered, its energy efficiency can be improved by increasing the engine efficiency or by modifying the transmission system of the vehicle that transfers power from the engine to the wheel. Modifying the engine is costlier, at the same time results achieved is also inferior against the transmission modification. Thus a considerable effort is going on in the research area for the development of better transmission that can enhance the vehicle energy efficiency.

Packaging is always an issue for an automobile as the automotive industry is moving towards improving the fuel economy and reduction of weight. Transmission, which is one of the heavy components in an automobile when modified, can help in optimizing the overall vehicle efficiency.

Even after the development of many new technologies in the area of transmission like AT, AMT, DCT still the most efficient transmission with best fuel economy available in the present scenario is manual transmission. Along with the advantage of best fuel economy it also has some disadvantage such as compromise in comfort and also the size of the transmission. The wheel whereas in the advanced technology planetary gear trains are used which are more compact. Thus there is always a scope of  improving  the  MT from  the  compactness  point  of  view. Thus, a novel approach to reduce the transmission size is proposed here which has the potential to improve fuel economy, reduce the material cost as well as solve the packaging constraint.

The research paper was publised in 2012 Third International Conference on Advances in Mechanical Engineering.
For more details you may please visit the conference link of the SEARCH DL.ORG
You can access the paper via the DOI allocated to the paper.
http://doi.searchdl.org/02.AETAME.2012.3.21

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