Special Small Plastic Dual Gear 16mm For Derailleur Corrosion Resistance
Plastic dual gears with special design for derailleur , a pin socket hole in the centre of small gear , four supporting beams are placed between pin hole and small gear .
Dual gears with a double different reference circles gears so that meet different speed requests under same power feeding , both gears have a same modulus .
Material
Duplex gears are made from plastic ABS
Technical Data
| Modulus |
m |
0.5 |
| Number of teeth |
z |
30 |
| Outside diameter |
da |
16 |
| Root diameter |
df |
13.75 |
| Reference circle |
d |
15 |
| 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 |
16 |
| Outside diameter |
da |
9 |
| Root diameter |
df |
6.75 |
| Reference circle |
d |
8 |
| 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 duplicate gears are mainly used to derailleur that for toy car , plane etc .
Thermal Performance
| Specific volume resistance Ω·cm |
15 |
| Thermal conductivity BTU-in/hr-ft2-°F |
1.1 |
| Distortion temperature ( 1.8 Mpa ) -°F |
195 |
| Normal working temperature ℃ |
-40～100 |
| Brittle temperature ℃ |
-60℃ |
| Melting temperature ℃ |
217~237 |
| Pyrogenic decomposition temperature ℃ |
250 |
| Dielectric constant |
2.7～3.2 |
Mechanical Property
| Tensile strength Mpa |
61 |
| Elongation at break % |
10～15 |
| Bending strength MPa |
79 |
| Modulus of elasticity MPa |
2000 |
| Modulus of bending KSI |
300 |
| Notched Impact Strength(kg/cm2) |
18 |
| HR hardness |
116 |
| Modulus of elasticity for tension MPa ( 23℃) |
2300 |
Physical Performance
| Density ( g/cm3) |
1.1 |
| Water absorption % (23°C, 24 hr) |
0.3 |
| Shrinkage % |
0.5 |
Features
Perfect insulation
ABS dual gears are operated in the most surroundings conditions and are effected by temperature , moisture and use frequency .
Corrosion resistance
ABS dual gears are operated in the most surroundings conditions and are effected by temperature , moisture and use frequency .
s are available for water ,mineral salt ,alkali and acid .
Water proof
Water absorption is below 1%
Fire resistance
Fire resistance level is UL94V-2
Stable chemical performance
Heat proof
Melting temperature is 217~237℃
Resistance to wear
Oils proof
Wide temperature
ABS dual gears are operated in the most surroundings conditions and are effected by temperature , moisture and use frequency .
can be worked in -40~100℃
More plastic gears we manufactured
We provide more plastic gears except duplicate gears , eg , spur gears ,bevel gears ,plastic gears for reducer ,worm gears and involute gear .
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