Basic parameters of plastic gears Digital Tape Measure,Electronic Tape Measure,Laser Tape Measure,3 In 1 Digital Tape Measure Yucheng Weisite Measuring Tools Co., Ltd , https://www.wsttools.com
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1. Number of teeth Z
Closed gear transmission generally has a higher rotational speed. In order to improve the smoothness of the transmission and reduce the impact vibration, it is better to use more teeth. Smaller ones are better. The number of teeth of the small gear can be taken as z1=20~40. Open type (semi-open type) gear transmission, because the gear teeth are mainly worn and worn, in order to make the gears not too small, the pinion gears are not used too much, generally z1=17~20.
In order to avoid the gear from being cut, z1≥17 should be taken for the standard support cylindrical gear with α=20o. Z2=u·z1.
2. Pressure angle α rb=rcosα=1/2mzcosα
At the tangent point P of the two gear pitches, the acute angle between the common normal of the two tooth profiles (ie, the direction of the force of the tooth profile) and the common tangent of the two circles (ie, the direction of instantaneous motion at point P) is called The pressure angle, also known as the engagement angle. For a single gear, it is a toothed angle. The pressure angle of the standard gear is generally 20". In some cases, α = 14.5 °, 15 °, 22.50 ° and 25 ° are also used.
3. Modulus m=p/ π
The index circle of the gear is the benchmark for designing and calculating the dimensions of each part of the gear, and the circumference of the gear index circle = πd=zp
The modulus m is a basic parameter that determines the size of the gear. If the number of gears with the same number of teeth is large, the size is also large.
4. Tip height factor and headspace coefficient—h*a, C*
When the two gears are engaged, the tooth tip of one gear always enters the root of the other gear. In order to prevent the thermal expansion from dying and the space for storing the lubricating oil, the root height is required to be higher than the top of the tooth. The tip height factor and the headspace factor are introduced in order.
Normal teeth: h*a =1; C*=0.25 short teeth: h*a =0.8; C*=0.3
Dongguan Shunjie Gear Co., Ltd. is a professional manufacturer specializing in the design, manufacture and injection molding of plastic gears, toy gears, small modulus gears, worm gears and plastic gearboxes. The main products are: plastic gear, plastic worm, gear mold, plastic worm, reduction gear box, copper gear, pig intestine, gear box, toy tire, toy gear, plastic gear, metal gear, toy wheel, hardware gear box, small Modular precision gears, electric gearboxes, plastic toy gearboxes, metal gears. Contact: Tel, 18824561887, Emill: [email protected], QQ.
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1. Number of teeth Z
Closed gear transmission generally has a higher rotational speed. In order to improve the smoothness of the transmission and reduce the impact vibration, it is better to use more teeth. Smaller ones are better. The number of teeth of the small gear can be taken as z1=20~40. Open type (semi-open type) gear transmission, because the gear teeth are mainly worn and worn, in order to make the gears not too small, the pinion gears are not used too much, generally z1=17~20.
In order to avoid the gear from being cut, z1≥17 should be taken for the standard support cylindrical gear with α=20o. Z2=u·z1.
2. Pressure angle α rb=rcosα=1/2mzcosα
At the tangent point P of the two gear pitches, the acute angle between the common normal of the two tooth profiles (ie, the direction of the force of the tooth profile) and the common tangent of the two circles (ie, the direction of instantaneous motion at point P) is called The pressure angle, also known as the engagement angle. For a single gear, it is a toothed angle. The pressure angle of the standard gear is generally 20". In some cases, α = 14.5 °, 15 °, 22.50 ° and 25 ° are also used.
3. Modulus m=p/ π
The index circle of the gear is the benchmark for designing and calculating the dimensions of each part of the gear, and the circumference of the gear index circle = πd=zp
The modulus m is a basic parameter that determines the size of the gear. If the number of gears with the same number of teeth is large, the size is also large.
4. Tip height factor and headspace coefficient—h*a, C*
When the two gears are engaged, the tooth tip of one gear always enters the root of the other gear. In order to prevent the thermal expansion from dying and the space for storing the lubricating oil, the root height is required to be higher than the top of the tooth. The tip height factor and the headspace factor are introduced in order.
Normal teeth: h*a =1; C*=0.25 short teeth: h*a =0.8; C*=0.3
Dongguan Shunjie Gear Co., Ltd. is a professional manufacturer specializing in the design, manufacture and injection molding of plastic gears, toy gears, small modulus gears, worm gears and plastic gearboxes. The main products are: plastic gear, plastic worm, gear mold, plastic worm, reduction gear box, copper gear, pig intestine, gear box, toy tire, toy gear, plastic gear, metal gear, toy wheel, hardware gear box, small Modular precision gears, electric gearboxes, plastic toy gearboxes, metal gears. Contact: Tel, 18824561887, Emill: [email protected], QQ.
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