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Material: | POM | Fire Resitance: | UL 94V-2 |
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Modulus: | 0.5 | Teeth Number: | 78 |
Reference Circle: | 39 | Pressure Angle: | 20 ° |
Teeth Style: | Straight | Pitch: | 1.57 |
Highlight: | small plastic gears,custom plastic gears |
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 .
Contact Person: Mr. David
Tel: 86-769-82601418
Fax: 86-769-82601418