Somdeep Sarkar's document discusses synchromesh gearboxes. It begins by explaining that a synchromesh gearbox is a type of constant mesh gearbox that uses synchronizers instead of a dog clutch to equalize gear speeds before meshing, allowing for smooth gear changes without double clutching. It then describes the main components of a synchromesh gearbox and how the synchronizers work. Some key advantages are smooth shifting without noise or damage, while disadvantages include higher cost and susceptibility to damage from improper use.

1. Somdeep Sarkar

2. CONTENTS
C
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T
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N
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S Introduction
1
Characteristics
2
Advantages and Disadvantages
3
Working
4

3. • WHAT IS SYNCHROMESH GEARBOX ?
This is a type of Constant Mesh Gearbox , where Synchronizers are used
instead of Dog Clutch . In mordern cars the synchromesh gearbox is
numeriously used .
It is modified version of constant mesh gearbox with synchronizing units---
i. which equalize the speed of gear and dog before meshing and provide
a smooth meshing .
ii. avoid the necessity of double clutching .
INTRODUCTION

4. I t c o n s i s t s o f C l u t c h s h a f t , L a y s h a f t , m a i n s h a f t ,
a n d S y n c h r o m e s h d e v i c e . T h e g e a r s o n l a y s h a f t
a r e r i g i d l y f i x e d w h i l e g e a r s o n t h e m a i n s h a f t a r e
f r e e t o r o t a t e o n t h e m a i n s h a f t w i t h r e s p e c t t o t h e
s p e e d o f l a y s h a f t .

5. CHARACTERISTICS
• Gears can freely rotate or locked to the shaft on which they are carried .
• The locking mechanism consists of a sliding collar which bridges between
two circular rings with teeth on them .
i) one travel with the gear .
ii) one travels with the shaft .
• The device work like a friction clutch .
• Equal speed ensure smooth meshing .
• Normally not used in 1st and reverse gear .

7. ADVANTAGES
• The synchromesh type of transmission has the big advantage of smooth
and quick shifting of gears without danger of damaging the gears and
without necessity for double clutching .
• It consider as the most advanced transmission and has been adopted in
most cars .
• Eliminate clashing of gears and make shifting easier .
• Engagement is done without noise and damaged the dogs.

8. DISADVANTAGES
• It is expensive due to high manufacturing cost and more number of parts .
• It is not capable enough to handle high loads .
• Upon improper handling , it is easily prone to damage .
• It could be affected by quick clutch disengagement on shifting .

9. THANK YOU