Hello, guys, I am here to tell you about transmission in cars, which is the basic module of an automobile. A transmission is a machine in a powertrain mechanism that transmits the power developed by the engine to the axle. The transmission is used to reduce the revolutions of the crankshaft down to a reasonable value by using interlocking gears. By doing so, makes more effective usage of the engine’s torque and helps to keep the engine operating at an appropriate speed. We all know manual and automatic transmission, but there are more types of transmission.
1) Manual Transmission
This is the basic Transmission type it used a manual clutch and the driver has to change gear and engage the gear ratios. Without a clutch, it is impossible to change gear when the engine is running cause the crank is rotating continuously, the clutch is a coupling device that is used to separate the engine and transmission which allows changing gear. It is easy to use just press the clutch pedal and shift the gear, it could be difficult for new drivers to manage the clutch and drive in real-life conditions, but a car enthusiastic will love it.
2) Automatic Transmission
The gear shifting is automatic and the gear ratios are engaged by the car’s computer, the driver is relieved from changing gear and pressing the clutch. The more gears the transmission has, the smoother the acceleration of the vehicle. AT is one of the most successful transmissions of today’s automobile industry. It is easy to use just press the brake and put in P(park)-R(reverse)-N(neutral)-D(drive), it becomes hassle-free to drive in traffic. AT is really easy for the new drivers. Though the performance and fuel economy do not match that of a manual transmission, it is getting better with the improvements in the automatic transmission in present times.
3) Continuously variable transmission(CVT)
It is a better version of automatic transmission also known as a single-speed transmission, it offers a better fuel economy smoother driving experience. The major difference is it does not have gears, this system uses belts and pulleys to produce an infinite range of ratios. It has a computer that adjusts the pulley to get the best gear ratio, which in return good fuel economy. One pulley is connected to the engine (input shaft) and the other to the drive wheels (output shaft).
The diameter of the pulley varies the transmission’s ratio. Making the input pulley smaller and the output pulley larger gives a low ratio (a large number of engine revolutions producing a small number of output revolutions) for better low-speed acceleration and vice versa. As the car accelerates, the pulleys vary their diameter to lower the engine speed as car speed rises.
It has various advantages :
- Step-less transmission
- High fuel economy
- Smooth drive
- Better emission control
There are some drawbacks :
- Limited amount of torque
- High wear
- High cost
Courtesy: Thomas Schwenke
4) Automated Manual Transmission(AMT)
It is just a manual transmission that works with the electronically controlled (microprocessor-based) clutch. It has a drive mode D(drive) N(neutral) R(Reverse) gear system just like automatic, but it also has the manual option with + for upshift and – for downshift. Without the manual clutch, it helps the driver to less tired in traffic. It has the best of both worlds easy to drive and fun to drive.
- Easy to drive
- Better fuel economy
- Reasonable price
- Fun to drive
5) Dual Clutch Transmission (DCT)
The name itself says it has two clutches. One clutch handles odd gears and the other the even gears. When you are accelerating in third gear the computer will pre-select the fourth gear and it will deselect the odd clutch and select the even clutch, this reduces the shifting time which improves the performance and fuel efficiency. And the same will happen if you’re braking from fourth gear, it will pre-select the third gear and deselect the even clutch and select the odd clutch. In this system there is constant power flow even during the transition, therefore no power loss during transition.
I personally love manual shifting cause it adds more fun when your driving. For new drivers, Automatic transmission is the best option. But the best is the DCT which adds fun and ease of driving in any condition.
Also published on Medium.