Medical Device High Precision Gears , 78 Teeth 40mm White Plastic
Spur Gears
0.5 modulus drive spur gear with 78 straight teeth , six strengthen
ribs placed on both surface sides and 6 mm pin with hole in centre
.
Key Features
Self-lubricant
Low noise
Small inertia
Efficient transmission
Light weight
Technical Data
| Modulus | m | 0.5 |
| Number of teeth | z | 78 |
| Outside diameter | da | 40 |
| Root diameter | df | 37.75 |
| Reference circle | d | 39 |
| 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
Precsion
Level 10 based on ISO standard .
Material
Drive spur gears are made from plastic POM fire resistance grade
UL94V-2
Application
Drive spur gears with common design for industrial parts except
medical device , eg. Duplicating machine ,printer ,timing device ,
wall clock ,vacuum cleaner ,car light etc .
Mechanical Property
| Tensile strength MPa | 62 |
| Elongation at break % | 60 |
| Bending strength MPa | 98 |
| Modulus of elasticity for tension MPa | 2830 |
| modulus of elasticity for bending MPa | 2600 |
| Compressive strength MPa | 110 |
| Shearing strength MPa | 54 |
| Notched Impact Strength(J/m) | 65 |
| HR hardness | 80 |
| Friction | 0.15 |
| Fatigue MPa | 31 |
Electric Performance
| Heat distortion Temperature(1.82MPa)℃ | 124 |
| Normal working temperature ℃ | 100 |
| Working temperature arrange ℃ | -40℃～100℃ |
| Coefficient of linear expansion (×10K) | 8.5 |
| Heat conduction W/(m·K) | 0.23 |
Features
High mechanical strength
Tensile strength can be up 50.5MPa . close to metal properties .
and only a tiny change on mechanical strength even working
temperature has a large change .
Good wear resistant
Wear resistant strength still keeps 35MPa or so even item is put 10
J variable load . it is best compared to items that with
PA,ABS,HPVC,PS,PC
Resistant impact
POM has good impact resistance but inferior to ABS and PC , Impact
performance will be down 90% or so if there is breaking on or in
product .
Self-lubricant
POM parts with F4 , C ,MoS2 ,PE and lubricant elements that improve
self-lubricant performance .
Stability in dimensions
POM part with good tensile strength and hardness that not easy to
be deformed and broken .
Resistant Organic solvent
POM parts are resistant for hydrocarbon ,alcohol ,ether ,aldehyde ,
gasoline ,lubricant and Weak Alkalis .
Small creep properties
Creep property rate is 2.3% or so in 20℃,21MPa,3000h . and nearly
not be effected by temperature
Good insulation
POM items nearly not be effected by temperature and humidity on
insulation . insulation is related with the thickness of items , eg
when thickness is 0.127mm insulation is 82.7kV/mm,thickness is
1.88mmi insulation is 23.6kV/mm
In addition to plastic spur gear , we make more plastic gears as
well like bevel gear ,duplicate gear ,herringbone gear etc which
are used to various fields . customized designs are also available
for us . welcome you to contact us for more information about
plastic gears .
