20mm Wheel White Plastic Crown Gears Compact With 28 Z Straight Teeth
Plastic wheel crown gears with crown body shape , the straight teeth with bigger reference circle are placed on side surface and another side surface has a smaller gear with different reference circle , directions of both gears are contrary . the number of teeth and reference circles are different as well .
Material
Wheel crown gears are made from plastic nylon PA 66
Technical Data
Including Modulus , Number of Teeth ,Outside diameter ,Root diameter ,reference circle ,depth of tooth ,tooth addendum ,tooth dedendum ,pitch ,teeth thickness and pressure angle .
| Modulus |
m |
0.5 |
| Number of teeth |
z |
28 |
| Outside diameter |
da |
15 |
| Root diameter |
df |
12.75 |
| Reference circle |
d |
14 |
| Depth of tooth |
h |
1.12 |
| Tooth addendum |
ha |
0.5 |
| Tooth Dedendum |
hf |
0.625 |
| Pitch |
p |
1.57 |
| Teeth thickness |
s |
0.8 |
| Pressure angle |
ɑ |
20° |
Unit : mm Big gear in duplicate gears
| Modulus |
m |
0.5 |
| Number of teeth |
z |
8 |
| Outside diameter |
da |
5 |
| Root diameter |
df |
2.75 |
| Reference circle |
d |
4 |
| Depth of tooth |
h |
1.12 |
| Tooth addendum |
ha |
0.5 |
| Tooth Dedendum |
hf |
0.625 |
| Pitch |
p |
1.57 |
| Teeth thickness |
s |
0.8 |
| Pressure angle |
ɑ |
20° |
Unit : mm Small gear in duplicate gears
Precision
Level 9 based on ISO standard .
Application
Plastic crown gears are mainly used to derailleur and clutch for toy items , they are also used for following items as fittings with light load .
▲ Household appliances
▲ Official appliances
▲ Car
▲ Timing device
▲ Micro electric motor
▲ Camera
▲ Instruments and meters
Performances
| Physical Performance |
| Density ( g/cm3) |
1.14 |
| Water absorption % |
3 |
| Shrinkage % |
1～2 |
| Mechanical Property |
| Tensile strength MPa |
60～80 |
| Elongation at break % |
2.2 |
| Bending strength MPa |
100～120 |
| Modulus of elasticity for bending MPa |
2000 ～3000 |
| Notched Impact Strength(J/m) |
60～100 |
| HR hardness |
118 |
| Electrical Performance |
| Dielectric constant |
1.63 |
| Arc resistance sec |
130～140 |
| Specific volume resistance Ω·cm |
1.83×1015 |
| dissipation factor |
100～400 |
| Dielectric strength(kV/mm) |
20～30 |
| Thermal Performance |
| Normal working temperature ℃ |
80～120 |
| Brittle temperature ℃ |
-30 |
| Melting temperature ℃ |
252 |
| Pyrogenic decomposition temperature ℃ |
350 |
| Matin heatproof ℃ |
50～60 |
Features
▲ Small volume
▲ Light weight
▲ Compact structure
▲ Long transmission torsion
▲ Automatic slip resistant
We make more plastic gears with different specifications for many fields in industry , please contact us if you are interesting in any gear , we are able to develop customized plastic gears as well .
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20mm Wheel White Plastic Crown Gears Compact With 28 Z Straight Teeth Images
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