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FORWARD & REVERSE GEAR SYSTEM - DIY kit for Students

Updated: Dec 18, 2023




A manual transmission requires the driver to operate the gear stick and clutch in order to change gears (unlike an automatic transmission or semi-automatic transmission, where one or both of these functions are automated). Most manual transmissions for cars allow the driver to select any gear ratio at any time, for example shifting from 2nd to 4th gear, or 5th to 3rd gear. However, sequential manual transmissions, which are commonly used in motorcycle and racing cars, only allow the driver to select the next-higher or next-lower gear.

Main functions of a gear box is as follow:

1. Provide the torque needed to move the vehicle under a variety of road and load conditions. It does this by changing the gear ratio between the engine crankshaft and vehicle drive wheels.


2. Be shifted into reverse so the vehicle can move backward.

3. Be shifted into neutral for starting the engine.


FOR YOUR INFORMATION

Gear Stick (A gear stick or gear lever / gearshift / shifter is a metal lever attached to the shift assembly in a manual transmission-equipped automobile and is used to change gears). Main shaft : It carries power form the counter shaft by use of gears


Counter shaft : Counter shaft is a shaft which connects with the clutch shaft directly and connected to engine.




OBSERVATION : The shaft from the Double Shaft Motor (engine) turns the another shaft ( Counter shaft), which turns the Driver gear on the right. This gear transmits the rotation from the axis of one gear to the axis of another. The teeth of a gear one one axis mesh with the teeth of a gear on another, thus creating a relationship between the rotation of the two axes. When one axis is spun, the other will too. Two gears of different sizes will make their two axes spin at different speeds. For reversing the gear slide the Gear Stick ( Change the Gear i.e. Reverse Gear ). You will observe that an idler gear is interposed between gears on the two shafts (i.e. Main Shaft and Counter Shafts), causing the main shaft to reverse direction.


HOW IT WORKS


A gear is a wheel with teeth around its circumference. Gears are usually found in sets of two or more, used to transmit rotation from the axis of one gear to the axis of another. The teeth of age a r one one axis mesh with the teeth of a gear on another, thus creating a relationship between the rotation of the two axes When one axis is spun, the other will too. Two gears of different sizes will make their two axes spin at different speeds.


Black gear – Driver Gear

Blue Gear – Driven Gear The black gear is turned clockwise This gear transmits its energy through the to the blue gear. Hence the blue gear on the left is turned anti-clockwise.The two blue and black gears in the above situation turn in opposite directions. This can also be described by saying that the two gears counter-rotate.


Working of a principle gear box:


In a gear box, the counter shaft is mashed to the clutch with a use of a couple of gear. So the counter shaft is always in running condition. When the counter shaft is bring in contact with the main shaft by use of meshing gears, the main shaft start to rotate according to the gear ratio. When want to change the gear ratio, simply press the clutch pedal which disconnect the counter shaft with engine and change connect the main shaft with counter shaft by another gear ratio by use of gearshift lever. In an gear box, the gear teeth and other moving metal must not touch. They must be continuously separated by a thin film of lubricant. This prevents excessive wear and early failure. Therefor a gearbox runs partially filled with lubricant oil.


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