Gear Box
When the vehicle is running on the road, there is resistance as follows:
i) Resistance due to road bumps
ii) Resistance due to air
iii) Resistance due to high plateau
iv) Resistance due to weight on the vehicle
To reduce this resistance, the vehicle sometimes requires more power and sometimes more speed. The gear box is used in the vehicle to increase this power and speed.
Location - The cross member between the clutch and the propeller shaft fits on the engine housing with a nut and bolt.
Function:
1) Taking the speed through the clutch and transmitting it to the wheels through the propeller shaft and differential.
2) Accelerating the vehicle by increasing the power while keeping the engine speed constant.
3) Overcoming resistance such as air resistance, climbing resistance, and rolling resistance fluctuations.
4) Maintaining the ratio of high torque and low speed or high speed and low torque.
5) Accelerating the vehicle in a forward or reverse direction.
6) Keeping the vehicle in neutral, disconnecting the wheel and engine, and providing forward or reverse speed as required.
7) Linear control of speed and torque in an automatic transmission system.
Gears - The following types of gears are used in the gear box:
i) Spur gear
ii) Helical gear
iii) Double helical gear
Parts in Gearbox:
1) Gearbox body
2) Clutch shaft
3) Main shaft
4) Main shaft gear
5) Engaging dog
6) Countershaft or lay shaft
7) Lay shaft gears
8) Reverse idler gear shaft
9) Reverse idler gear
10) Shifting mechanism
11) Anti-friction bearing
Gear Box Operation:
Although the gear box design and gear selection methods of different companies vary, they all work the same way. When the clutch is engaged, the clutch shaft is always accelerating. There is a clutch shaft and a countershaft with gear. The gear is constantly in mesh. When the clutch shaft rotates, the countershaft will also rotate, but in the opposite direction. Since all the gears are fixed on the countershaft, they all keep rotating. The countershaft is fitted with a bearing, and at the rear, it is fitted with a bearing in the gearbox body, with a cover and oil seal at the back. The shifting lever and selector fork are used to change gears. The gear selector or shifting fork or yoke is mounted on the selector or shifting rod in the gearbox top cover with the help of a pressure spring and a steel ball. The gear shifting lever is mounted on the upper side of the gear shifting fork.
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