Gearbox which can be called transmission box is an element of power in auto. The adjustment of speed and torque of the automobile depends on the gear system but also according to the load and road condition. Transmission box adjust the engine speed into torque as it moves up the hills and when it’s important for the auto to do so. At times it is identified as torque converter. There are numerous types of gear systems in the automobile industries. Actually they include the following, spiral gearboxes, bevel gearboxes, spur gearboxes, hypoid gearboxes and helical gearboxes among others. Spur gear systems are the largely reasonable and direct gearboxes available. The order in which their radial teeth are situated enables them to handle high gear ratios thus giving exceedingly high level of helpfulness. Spur gear systems have their shortcomings too. They generally tend to generate a lot noise and pressure, and that the reason why spur gearboxes are popularly used for low-speed and low-contact tasks where loud noise is endurable. Bevel transmission boxes are made up of bridge rods and cone-style that support versatile movement in the area directly linking these shafts. They are competent of managing pressure due to the care used to fit feature axes in them. Bevel gearboxes have lower productivity levels than helical and spur gear systems. The bevel transmission boxes do work well with smaller gear ratios, conceivably, even more, better than helical gear systems. Helical gear systems often considered to be like spur gears however their teeth are not positioned in a crossway manner to the revolving shaft. Although these gears are placed at an angle, often at a right angle. Helical gears have less load ability due to the equivalent arrangement of their teeth. Their teeth positioning also allow for modest engagement hence ensuing in a job that is significantly quieter than that of spur transmission boxes.
The loading directions of helical transmission boxes allow them to work with advanced torques, even if their effectiveness ranges are similar. These kinds of gearboxes have their weaknesses as well, in fact, the level of medial thrust they are using, that demands the use of sufficiently oiled shaft bearings. Spiral transmission boxes are adjustment of bevel gear system, and they give benefits equal to helical gearbox systems with teeth that join bit by bit. Gradual engagement of gear system have brought about smoother, and reduction of noise in spiral gear system rods. The effectiveness level of the spiral systems is very high. Hypoid transmission boxes look like spiral bevel kind, but their drive shafts only do not touch. Hypoid gearboxes function properly with right angle impel shaft. They result in lesser noise, and they are powerful than spiral bevel gearboxes. They can as well handle high-speed ratio.