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 .
