![]() Presentation Gearbox - Free download as Powerpoint Presentation (.ppt /.pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Scribd is the world's largest social reading and publishing site. 2 CATIA Model of Six speed constant mesh Gearbox. CONCLUSION Although there are much advancement in the field of designing and fabrication of gear boxes, the constant mesh gear box is one of the most efficient gear boxes. The Project was an exposure to the world of practical working. Teeth at awkward moments, so it.Disadvantage of constant mesh vs sliding mesh: slightly less efficient because of higher mesh teeth, but lasts longer because you dont grind. Sliding mesh gearbox ppt download. The arrangement and functions of various components of a typical synchromesh gearbox is mentioned below: • Clutch shaft • Lay shaft • Main shaft • Bearings • Reverse idler shaft • Transmission gears • Synchromesh Device • Selector mechanism • Transmission case 1) Clutch Shaft: • It is the input shaft to gearbox • Its outer end is connected to the clutch disc. • It has a gear machined at its inner end that meshes with respective gear on the lay shaft 2) Lay Shaft: • The lay shaft is freely suspended in bearing mounted on the transmission case. • It has gears rigidly mounted/machined on it. 3) Main Shaft: • It is output shaft of the gearbox. • It has splines cut across its length to accommodate axial movement of gears on it. • its outer end is connected to the propeller of the shaft through universal joint. 4) Bearings: • Generally, taper roller bearings are used. • These bearings are required to take radial and thrust load during gear engagement. 5) Reverse idler shaft: • It is a short shaft that supports the reverse idler gears. 6) Transmission gears: • In synchromesh gearboxes, generally helical gears are used. • These gears can be grouped into Gears on clutch shaft - rigidly attached/machined Gears on lay shaft - rigidly attached/machined Gears on main shaft - free to rotate on main shaft Gears on reverse idler shaft - rigidly attached/machined 7) Synchromesh Devices: • It consist of sliding dog memebrs 8) Selector mechanism: • The selector mechanism employed is similar to that used on sliding mesh gearbox. 9) Transmission case: • It provides support for bearing and shafts. • It also provides and enclosure for lubricating oil. • Generally it is made up of aluminium to reduce weight. • It has a vent on its top surface to ensure atmospheric pressure inside the gearbox.
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