Transmission, Part 2, Automotive Chassis and Transmission

* Types of Transmission:

4. SYNCHROMESH

Synchromesh transmissions are refined version of the constant mesh system, although they are less common. How it improves the system is just by adding another stage to the process of connecting the gears to the drive shaft through the dog clutch respectively.

It splits the dog clutch into two – a gear fixed to the drive shaft called the synchronizer hub, and a collar around the outside of it that could slide back and forth is called the shift sleeve.

A new component is added to the gears themselves – the synchroniser cone - and a further moving part that is called the synchronizer ring is introduced that surrounded the cone.

Now this is where it gets a little bit complicated.

Now the collars, or shift sleeves, are now the components controlled by the gear stick - and they can be slide halfway in either direction onto the synchroniser rings. This forces the rings against the synchroniser cones to get attached to the gears, and through the increased friction caused by the widening cone it can either speed up or slow down the gear to match up the speed of the shifting sleeve and synchronizer hub.

Once the speeds are matched closely enough, the sleeve can continue to slide over the blocker ring and directly mesh with both the cone and the gear, connecting everything together and transferring power to the drive shaft.

Unbelievably all of this happens in less than of a second it takes you to shift gear, providing you with an even smoother gear change.

5. Epicyclic Transmission

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Pic 1


The working principle of the epicyclic gearbox is based only on the fact that the fixing of the gears i.e. sun gear, planetary gears and annular gear is done here to obtain the required torque or speed output. As fixing of any of the above causes variation in gear ratios from high torque to high speed. So let’s see how these varied ratios are obtained

i) First gear ratio
This provide a high torque ratio to the vehicle which helps the vehicle to move from its initial state  and is obtained by fixing the annular gear which in turn causes the planet carrier to rotate or spin with the power supplied to the sun gear.

ii) Second gear ratio
This provides a high speed ratio to the vehicle which helps the vehicle to attain much higher speed during a drive, these ratios are obtained by fixing the sun gear which in turn makes the planet carrier into the driven member and annular into the driving member in order to achieve high speed ratios.

iii) Reverse gear ratio
This gear reverses the direction of the output shaft which results in reversing the direction of the vehicle, this gear is achieved by fixing the planet gear carrier which in turn here makes the annular gear into the driven member and the sun gear into the driver member.

Note- A no. of speed or torque ratios can be achieved by increasing the number planet and sun gear in epicyclic gear box.

Note: The rest will be discussed in the next upcoming part. For any queries or questions you can directly mail me. Or just dm me on instagram @chakitg. 


Regards: 

Er. Chakit Gupta
Transmission, Part 2, Automotive Chassis and Transmission Transmission, Part 2, Automotive Chassis and Transmission Reviewed by Oyetechy.com on November 06, 2019 Rating: 5

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Transmission, Part 2, Automotive Chassis and Transmission

* Types of Transmission: 4.  SYNCHROMESH Synchromesh transmissions are refined version of the constant mesh system, although they are l...

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