Durable High Precision Gears 13.5mm Derailleur Nylon Duplex Gear With 0.5m Modulus
Durable High Precision Gears 13.5mm Derailleur Nylon Duplex Gear With 0.5m Modulus
Plastic duplex gears have a double gears design with different reference circles but same modulus , speed for big reference circle gear is slower than speed for small reference circle gear when they are driven under same power , this design is used to driven system with multiple purposes .
Material
Duplex gears are made from plastic nylon ( PA 66 )
Technical Data
| Modulus | m | 0.5 |
| Number of teeth | z | 24 |
| Outside diameter | da | 13.5 |
| Root diameter | df | 10.75 |
| Reference circle | d | 12 |
| 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 | 10 |
| Outside diameter | da | 6 |
| Root diameter | df | 3.75 |
| Reference circle | d | 5 |
| 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 .
Performance
| 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
Wear resistance
Good self-lubricant
High mechanical property
Resistant high temperature
Normally , plastic nylon duplex gears can be operated smoothly at temperature 150℃ and thermal deformed temperature is up to 250℃ when parts with glass fiber .
Perfect elongation
Elongation at break is 2.2% according to ISO 527 testing method .
Corrosion resistance
Good insulation
Specific volume resistance is 1.83×1015 and resistance to high breakdown voltage support part to be good insulated .
Resistant impact
60 – 80 KJ/M2 normally .
Resistant fire
Generally , the fire resistance is UL94V-2 and UL64V-0 for special parts .
Resistance to low temperature
Parts can be workable at -30℃
Environment friendly
Plastic nylon duplex gears meet RoHS or REACH environmental production standard .
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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