About GEARS

 GEARS

• Modes of Power Transmission.
• No Intermediate link or Connector.
• Transmit motion by directed contact.
• Two bodies have Rolling or Sliding motion a long the tangent at the point of contact.

TYPES OF GEARS

1. Parallel shaft axis gear:- Gears involving two axis which are parallel to each other are called Parallel shaft axis gear. Example: Spur, Helical and Internal gear

                                                                      

PARALLEL SHAFT AXIS GEAR BOX

     2. Intersecting shaft axis gear:- Gears involving two axis crossing at a point are called               intersecting shaft axis gear. eg: Bevel(Miter) gears

Bevel gear

     3. Non-intersecting and perpendicular shaft axis gears:- Screw gears also sometimes                crossed Helical gears, are helical gears used in motion transmission between non-                  intersecting shaft and perpendicular shaft gears. eg: Worm gears

Non-intersecting and perpendicular shaft axis gears

     GEAR RATIO

V(velocity) = R ✕ ω(angular velocity)

ω = 2πN/60 

ω1/ω2 = R2/R1 = N1/N2 = T1/T2

ω1(driving gear) & ω2(driven gear), R1 & R2(radius of gear), N1 & N2(gears RPM), T1 & T2

(teeth of gears)

1. Spur gears:- It is simple types of gear, used in transmitting torque b/w parallel shaft.

• Teeth are mesh in horizontal position.    

DEMERITS

• Producing very noise during working.

     2. Helical gear:-Used in transmitting torque b/w parallel or  non-parallel shafts.

• Less noisy than spur gears.
• Messing very good each other.

    3. Bevel gear:- Used to transmit rotary motion b/w intersecting shaft.

• Teeth are formed on conical surfaces and teeth could be straight or spiral.

    4. Worm gear:- Used to transmitting motion b/w non- parallel & non- intersecting shafts.

• Depending on the no. of teeth engaged.
• Speed ratio is quite high.

Nomenclature in Gears

• Gear & Pinion. 
  
  
  
• Small driving gear is pinion.
• Larger one is the gear.
• This reduces speed but it increases torque. 

1. Introduction of Power Transmission Methods :https://megaknowledgeworld.blogspot.com/2021/01/introduction-of-power-transmission.html

 

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