Gear Box and Functions, Types of gear box

Why is the Gear box required for the Automobile :

 

 

 

•   The Automobile requires high torque when climbing hills and when starting, even though   

 

    they are performed  at low speeds

 

•   When driving power is required ,it reduces the engine speed and transmits stronger 

 

    torque to the driving wheels and   when high running speed is desired, it transmits 

 

    high–speed  low – torque to the wheels.

 

•   In addition, the transmission serves to reverse the vehicle

 

•   The transmission is installed immediately behind the clutch and is controlled by the gear 

 

     shift lever in the driver’s compartment

 

 Functions of the gear boX: 

 

 • To provide a means to vary the leverage or torque ratio between the engine and the road 

 

   wheels as required 

 

 • To provide reversing the direction 

 

 • To provide a neutral position so that the engine and the road wheels are disconnected 

 

   even with the clutch in the engaged position

 

 Types of Gear Box

 

• Gear boxes are classified according to the gear   

 

  arrangements and gear shifting mechanisms

• Generally a gear box will  have 3 to 4 forward gears 

  and 1 reverse gear

 
Types of Gear Boxes:

•Manually Operated

 

  • Sliding Mesh Gear Box 

  • Constant Mesh Gear Box 

  • Synchromesh Gear Box

• Chrysler semi automatic

• Automatic 

  • Epicyclic gear box

 

 Main Parts of the Gear Box:

 

•Clutch Shaft

•Lay  Shaft

•Main Shaft

•Idler Gear

•Dog Clutches

•Yoke

•Shifting Mechanism

 

•Clutch gear 

 

•Low and reverse gear

•Second and high speed gear

 

•Counter shaft drive gear

 

•Counter shaft second gear

 

•Counter shaft low gear

 

•Counter shaft reverse gear 

 

•Gear shift lever