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