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Product Details:
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| Material: | POM | Fire Resistance: | UL 94V-2 |
|---|---|---|---|
| Modulus: | 0.5 | Teeth Number: | 48 |
| Pressure Angle: | 20° | Reference Circle: | 24 |
| OD: | 25 | ID: | 22.75 |
| High Light: | small plastic gears,custom plastic gears |
||
POM High Precision Gears , 25mm Duplicate Gears for Toy Car Derailleur Straight Teeth
Duplicate gears are made up of a smaller gear and a bigger gear , both gears are same on modulus but different on number of teeth . speed can be adjusted as different reference circle diameters of both gears .
Technical Data
|
Modulus |
m |
0.5 |
|
Number of teeth |
z |
48 |
|
Outside diameter |
da |
25 |
|
Root diameter |
df |
22.75 |
|
Reference circle |
d |
24 |
|
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 Bigger 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 Smaller gear in duplicate gears
Precsion
Level 9 based on ISO standard .
Material
Plastic duplicate gears are made from plastic POM with white color .
Application
Plastic duplicate gears are mainly used to derailleur that for toy car , plane 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
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
Tips for use
POM duplicate gears are easy to be cracked and pulverized outside long-term .
Don’t put POM duplicate gears under temperature over 100℃
Don’t put POM duplicate gears under circumstance with alkali and oxidant .
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 .
Contact Person: MR.LIN
Tel: +8613556778272
| Factory Address:NO.12 HUANGHE RD ,HUANGJINAG , DONGGUAN, GD,CHINA | |
| Sales office:NO.12 HUANGHE RD ,HUANGJINAG , DONGGUAN, GD,CHINA | |
| +86-769-82601418 | |
| group1@vedali.com | |
