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