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Common gear transmission types

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  • Author:Richard
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  • Time of issue:2019-05-23 16:55
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Common gear transmission types

(Summary description)Dongguan Chaojun Gear Co., Ltd., we provide a full range of services such as precision transmission solutions, precision parts and mold design and manufacturing, gearboxes and product development and assembly; business contact information Mobile phone: 13560776599 Email: richardlee@gearjk.com Contact: Richard

  • Categories:Chaojun News
  • Author:Richard
  • Origin:
  • Time of issue:2019-05-23 16:55
  • Views:
Information

Involute gear

When a straight line is purely rolling along a circle, the track of any point on the line is called the involute of the circle, the circle is called the base circle of the involute, and the straight line is called the occurrence line. A gear with an involute as the tooth profile is called an involute gear. Involute gears can maintain a constant transmission ratio.img

AK: Involute

rb: base circle

nn: occurrence lineimg

pressure angle

The angle between the direction line of the normal pressure at any point on the involute line (that is, the normal line of the involute at that point) and the speed direction of the point is called the pressure angle at that point.

In the left figure below, αk is the pressure angle at point K on the involute line. It can be seen from the figure: cosαk=ON/OK=rb/Rk.

In the right figure below, the pressure angle is the angle between the radius line and the tangent of the tooth profile, α is the pressure angle, because α'=α, so α 'is also the pressure angle
imgimg

The pressure angle of each point on the involute line is not equal. The pressure angle on the base circle is zero, and the pressure angle on the addendum circle is the largest. Generally speaking, the gear pressure angle refers to the pressure angle on the index circle, expressed by α, and specifies the standard value of the pressure angle on the index circle, which is called the standard pressure angle. Our country takes α=20°.img

The names and basic parameters of each part of the gear

End surface-a plane perpendicular to the axis of the gear

Normal surface-the plane perpendicular to the tooth line of the gear

Tooth line──the line of intersection between the tooth surface and the indexing cylindrical surface

Base circle ── a circle on which the involute line of occurrence is purely rolling

Tooth width b ──The size of the gear teeth along the axial direction

Reference rack ──The rack cut out according to its standard gear specifications is called the reference rack

Pitch Circle ──The occlusal contact point of the two gears is called the pitch circle.

Pitch Diameter ──Pitch Diameter

Index circle ─ ─ Between the addendum circle and the root circle, a circle with a diameter of d is specified as the reference for calculating the size of each part of the gear. This circle is called the index circle. The size of the index circle is determined by the tooth pitch and the number of teeth.

Divided circumference dπ=mz, d= pz/π
imgimg

The name and basic parameters of each part of the gear

1. Index circle: the circle on the gear as the reference of the gear size, denoted by d

2. Tooth pitch: the length of the indexing arc between two adjacent teeth on the same side profile, denoted by p

3. Modulus: the ratio of tooth pitch P to π, expressed in m

4. Pressure angle: the pressure angle a at the intersection of the involute tooth profile and the index circle, the national standard pressure angle is 20 degrees

5. Addendum height: the radial height from the index circle to the addendum circle, expressed in ha

6. Head clearance: After the two gears are assembled, the gap distance left by the two meshing teeth in the radial direction, denoted by C

7. Tooth root height: the radial height from the index circle to the tooth root circle, expressed in hf

8. Total tooth height: the radial height from the tooth tip circle to the tooth root circle, represented by h

Detailed explanation of gear related parameters?

★The correct meshing condition of spur gear: equal modulus and equal pressure angle

Standard spur gear size calculation formula table

 

 

name

symbol Calculation formula
Tooth pitch p P=mπ
Tooth thickness s=mπ/2
Slot width e = mπ / 2
Tooth top height he has ha = ha ※ m
Tooth root height hf hf =( ha※+ C※)m
Full tooth height h h =(2 ha※+ C※)m
Diameter of index circle d=mz
Addendum circle diameter da da = d ± 2 ha
Tooth root circle diameter df df=d±2 hf
Base circle diameter db db = dcosa = mzcosa
Center distance a a=m(Z2±Z1)/2

Number of teeth and tooth surface

Number of teeth: Seen from the reference plane, if measured clockwise, the number of teeth or grooves defined by the tooth/slot is 1,2..., and Z is the total number of teeth.

Detailed explanation of gear related parameters?

Tooth surface: How to judge whether a tooth surface is left or right? There are 2 methods:

1. Standing outside the gear and looking at the teeth, the left hand is the left tooth surface, and the right hand is the right tooth surface

2. Standing in the center of the gear and looking at the cogging, the left hand is the left tooth surface, and the right hand is the right tooth surface

For a tooth surface, no matter which method is used, the result is the same.

Detailed explanation of gear related parameters?

Normal modulus and end modulus

The normal face modulus is the modulus of the normal face tooth profile of the helical gear; the face face modulus is the modulus of the end face tooth profile of the helical gear.
Normal face modulus (normal face pressure angle, etc.) is used for gear manufacturing and strength checking. The end face modulus (end face pressure angle, etc.) is used for structural size calculation.

For helical gears, the conversion formula of face modulus mt and normal face modulus mn:

(Β: helix angle)

For spur gears:Detailed explanation of gear related parameters?

Shift gear

The involute gear is processed by the generative method. When the center line of the rack cutter is tangent to the index circle of the gear blank, the processed gear is called a standard gear. If other conditions remain unchanged, only change the relative position of the tool and the gear blank, so that the center line of the tool is no longer tangent to the index circle of the gear blank, so that the machined gear is called a shifted gear.

The distance between the center line of the rack cutter and the index circle of the gear blank is called the displacement, which is expressed by the product xm of the displacement coefficient x and the gear module m. When the tool is far away from the gear center, x>0, such a gear is called a positively shifted gear; on the contrary, when the tool is closer to the gear center, x<0, such a gear is called a negatively shifted gear.

Compared with standard gears, because the base circle has not changed, the tooth profile curve is the same involute, but the positively modified gear uses a larger radius of curvature, while the negatively modified gear uses a smaller radius of curvature. A section of involute.

Detailed explanation of gear related parameters?

Compared with standard gears, the modulus, number of teeth, and pressure angle of the modified gear are unchanged;

Normal non-shift gear at the index circle: gear tooth thickness = tooth slot width; shifted gear, change the position of the tool during processing (outward or inward than the normal position), so: gear tooth thickness ≠ tooth slot width.

In the positive displacement, the tooth profile curve segment is far from the base circle, the addendum circle and the tooth root circle also increase correspondingly, the tooth root height decreases, the tooth tip height increases, the indexing circle tooth thickness and the tooth root circle thickness Both are enlarged, but the tooth top is easy to become sharp;

In negative displacement, the tooth profile curve segment is closer to the base circle, the addendum circle and the root circle are correspondingly reduced, the tooth root height increases, the tooth tip height decreases, the indexing circle tooth thickness and the tooth root circle thickness All decrease.

PP: the reference line of the reference rack

Detailed explanation of gear related parameters?

Detailed explanation of gear related parameters?

 

Gear type

Gear type application
Spur gears, helical gears, herringbone gears Transmission between parallel shafts
Helical gears, worm gears and worms Transmission between vertical staggered shafts
Internal gear Transmission between parallel shafts in the same direction
Gear rack Conversion of rotary motion and linear motion
Straight bevel gears Transmission between intersecting shafts

 

Detailed explanation of gear related parameters?
Link: http://www.cadhome.com.cn/archives/17148
 

Dongguan Chaojun Gear Co., Ltd., we provide a full range of services such as precision transmission solutions, precision parts and mold design and manufacturing, gearboxes and product development and assembly;

Business Contact: Mobile: 13560776599 E-mail: richardlee@gearjk.com Contact: Richard

 

 

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The Chaojun team has officially obtained IATF 16949 certification, and customers in the automotive industry are welcome to consult

The Chaojun team has officially obtained IATF 16949 certification, and customers in the automotive industry are welcome to consult

Dongguan Chaojun Gear Co., Ltd., we provide a full range of services such as precision transmission solutions, precision parts and mold design and manufacturing, gearboxes and product development and assembly;
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Common gear transmission types

Common gear transmission types

Dongguan Chaojun Gear Co., Ltd., we provide a full range of services such as precision transmission solutions, precision parts and mold design and manufacturing, gearboxes and product development and assembly; business contact information Mobile phone: 13560776599 Email: richardlee@gearjk.com Contact: Richard
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