Gearboxes are a system that converts engine power to the desired speed, torque and direction.

Different types of gearboxes are used in automobiles. Synchromesh gearbox is one of them manual gearbox.

The function of the synchromesh gearbox is similar to that of a constant mesh gearbox.

They use a special component called a synchromesh unit to eliminate the double de-clutching function of the constant mesh gearbox. This helps to engage the gears smoothly.

Synchronizer is simply a clutch-like mechanism.

When selecting a high speed gear, meshing both gears should be done very carefully. Failure to mesh at the same speed may result in cracking or wear of the gear teeth. The synchromesh unit helps to avoid this.


Only high speed gears in Synchromesh gearboxes with the help of the Synchromesh unit, and in first and reverse gears which are gears that transfer more torque
Dog clutches will be fitted as well as constant mesh gearboxes. This helps to reduce construction costs.
Construction




The synchronizer is placed between two gears. Therefore, we can use a synchronizer unit for two gears. G1 and G2 are ring-shaped members. They have an internal tooth that meshes exactly with the internal teeth. F1 and F2 are the sliding members on the main shaft. The friction surfaces are H1, H2, N1, N2, P1, P2, R1 and R2.

First Gear Performance:

 




For first gear, the ring shaft and sliding part (eg G2, F2, P1, P2) move to the left until the angles come into contact. The friction will then be proportional to its velocity. When G2 is equal to its rpm, it shifts further to the left and connects to the P2 tee. The clutch gear transfers power from gear B to the shaft gear (U1). After that, the motion is transferred to the shaft gear (U3) and the main shaft gear (D).

 

Power is transferred to the Second Gear in the same manner.


Top gear performance:




Engine power is transferred from cluster gear B to F1, a sliding component with upper gear or direct gear. Top gears usually have direct drive. Thus the engine power is transferred directly to the wheel through the main shaft.



Reverse gear operation:



For reverse gear, power is transferred from clutch gear B to the shaft gear U1. Thus when the shaft rotates as a whole, the gear U4 placed on it also rotates. However, unlike other gears, the le shaft gear is not directly attached to the main shaft gear, but is connected to the main shaft gear E via an idler gear U5. Transmitted to the wheels via the main shaft.
 

Advantages of Synchromesh Gearbox

  • Smooth and noiseless shifting of gears best suited for vehicles.
  • Gear shifts do not cause torque transmission loss from the engine to the driving wheels.
  • Double de-clutching is not required.
  • Low vibration.
  • Gears can shift gears quickly without the possibility of wear or tear.

Disadvantages:

  • High production cost and number of moving parts
  • When in contact with the gear, it may interfere with the mesh as it rotates at different speeds.
  • Improper gear handling can lead to damage.
  • There are some limitations to handling high loads.