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Friday, October 10, 2014

Jenis-jenis roda gigi / Gears Type


1.Roda gigi lurus (Spur Gear)


Teeth are parallel to the axis of the gear

Advantages

Cost is cheapest

Ease of manufacture

Availability in standart parts

Disadvantages

Only works with mating gear

Axis of each gear must be parallel

2.Roda gigi miring (Helical Gear)

Teeth are at an angle to the gear axis (usually 10° to 45°) – called helix angle

Advantages

Smooth and quite due to gradual tooth engagements

More tooth surface engagement allows for greater power transmission for given gear size.

Parallel to perpendicular shaft arrangement

Mating gear axis can be parallel or crossed
Can withstand the largest capacity at 30,000 hp
 

Disadvantage

More expensive

Resulting axial thrust component

3.Roda gigi payung/kerucut (Bevel Gear)

Teeth at helix angle

Very Strong

Used in rear end applications

Gear axis at 90°, based on rolling cones

Advantages

Right angle drives

Disadvantages

Get axial loading which complicates bearings and housings

4.Roda gigi cacing (Worm Gear)


Gears that are 90° to each other

Advantages

Quiet / smooth drive

Can transmit torque at right angles

No back driving

Good for positioning systems

Disadvantage

Most inefficient due to excessive friction (sliding)

Needs maintenance

Slower speed applications

 Gear Manufacturing :


  
Module system of gear

The module is the ratio of the pitch diameter to the number of teeth. The unit of the module
is milli-metres.Below is a diagram showing the relative size of teeth machined in a rack with
module ranging from module values of 0,5 mm to 6 mm


CATATAN :
1.Module distandarisasi (ada tabel standar module)
2.Dua roda gigi yang bekerjasama harus mempunyai modul yang sama
3.Jumlah gigi (z) harus merupakan bilangan bulat




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