How are internal helical teeth processed? Not helical teeth, not in large numbers

The helix angle is the same, that is, the angle value of the helix angle of the rack and gear is equal. As for the measurement method, it depends on the specific situation. What are the measuring tools?

What is the number of teeth of a gear? What is the approximate helix angle? What is the tooth width?

Module size? The following measurement methods are recommended. (General Measuring Tools)1

Use the imprint method to measure the helix angle with a rack. 2.Use gears to measure multiple common normals (because there are no gear parameters and information, it is impossible to suggest the number of cross-teeth, measure to see if the measurement point is in contact (cut) on the tooth surface, the number of cross-teeth is more, the measurement point is by the tooth top, and the number of cross-teeth is less than the measurement point is by the tooth root.

Be sure to measure (with a common normal micrometer or caliper) accuracy. ）3.The number of adjacent spans is then subtracted, and the difference is the base section of the gear (base pitch).

Calculated using the MZCOS = PB (base node) formula, the pressure angle is assumed to be ., respectively5° (because I don't know which country's gear), and then find the modulus value separately, and see which modulus value is close to the standard modulus, that is, the gear modulus and pressure angle can be determined at the same time. 4.

Finally, use the measured gear parameters to calculate, and check whether the dimensions of other parts of the gear are consistent. (such as tooth top circle, tooth root circle, tooth top thickness, etc.).

As a designer, you just need to know that the Archimedes worm (ZA) is suitable for situations where low speed and light load are not important. Moreover, the helix angle should not be too large, otherwise it will not be easy to process. The normal straight tooth profile (ZN) is suitable for precision transmission of worms with multiple heads.

The involute profile (ZI) is suitable for precision transmission with multiple head counts and can achieve very high speeds. In general, the hardness of the tooth surface is slightly lower than that of the worm after heat treatment. The national standard recommends that we use conical wrap cylinders and involute worms.

This can be a mold.

I didn't know much about these concepts before, but now I can learn them well.

The helix angle commonly used in helical gears is generally 8° to 20°.

Calculation formula: tooth top circle diameter da=mz cos +2m indexing circle diameter d=mz cos the center distance of the two gears meshing a=m(z1+z2) cos and so on, these can be calculated helix angle.

Helical cylindrical gearing is superior to straight gears and can be used for high-speed heavy loads by tightening the center distance. Helical gear reducer is a novel reduction transmission device. Adopting the design concept of optimization, advanced module combination system, it has small size, light weight, large transmission torque, stable starting, fine transmission ratio grading, and can be arbitrarily connected and selected from a variety of installation positions according to user requirements.

The helix angle commonly used in helical gears is generally 8° to 20°;

Calculation formula: tooth top circle diameter da=mz cos +2m indexing circle diameter d=mz cos the center distance of the two gears meshing a=m(z1+z2) cos and so on, these can be calculated helix angle.

In fact, the helix angle of helical gear is an important gear parameter, which directly affects the size of the overlap coefficient, and can make up the center distance.

If the gear strength is sufficient, the choice of helix angle becomes "cumbersome", and the helix angle should not be less than 12°, the helix angle is too small to reflect the advantages of helical gears, so simply use spur gears.

8-20 degrees can be used, and 14 degrees is often used for trial calculations.

The national standard manual has regulations on the helix angle.

General cylindrical involute gears.

It's 8 to 15 degrees, and if there are no special regulations you can start the initial design with 10 or 12 degrees, if you need to adjust it!

2. +What is the difference between machining spur gears and machining helical gears?

Hello dear, <>

1。Different properties: (1) Helical gear transmission:

A common part is often used in mechanical transmission, and the gear is made of high-quality high-strength alloy steel. (2) Spur gear transmission: a classification of gears.

Second, the advantages are different. 33601.Advantages of helical cylindrical gear transmission:

1) Good meshing performance: the meshing process of helical cylindrical gears is an excessive process of rotation, and the force on the tooth surface gradually increases from small to large, and then gradually increases from large to small; Helical cylindrical gears are suitable for high-speed and heavy-duty occasions. (2) Large degree of coincidence

The increased degree of coincidence increases the load carrying capacity of the gears. This results in a longer service life of the gears. The degree of coincidence is mainly determined by the meshing time, and the helical gears with a long engagement time and a large contact area reduce the stress.

Power transmission stability and economic growth. (3) Compact structure: the smaller the minimum number of teeth, the more compact the structure.

2.Advantages of spur gear transmission: strong bearing capacity and durability.

I hope my answer is helpful to you, and I wish you good health and a happy mood! <>

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1.The intersection line of the concentric cylindrical surface of the helical gear and the tooth profile is the helix, the helix angle of the base circle is the smallest, the helix angle of the tooth top is the largest, and the helix angle on the indexing circle is specified as the helix angle of the gear.

2.The cylindrical surface where the helix is located is an oblique straight line.

3.The formation of the helical gear tooth profile can be understood in this way. There is an oblique straight line above the cylindrical surface, the "rolled" cylinder forms the base cylinder, the oblique line forms the base circle helix, and the involute line is "generated" by the base circle helix, and the cylindrical surface at the top of the tooth "stops", which is the tooth profile on one side of the helical gear.

4.Learning gear theory is very abstract and boring, and mechanical engineering students all "walk" in this way. When you actually get in touch with the actual gears, you will feel the gear knowledge you learned in college.

The correct meshing condition of the gear is that the modulus and pressure angle must be equal, which is the "basic" condition. There are also "conditions" for "details", for example, tooth top clearance. If there is no crest clearance, the crest of one gear may interfere with the root circle of the other gear.

In addition, gear cutters can process gears, so that the gears can obtain standard parameters, including the top clearance coefficient. However, the "parameters" of the tool itself do not have the same standard backlash coefficient as the gear, please refer to the gear cutter section of the "Gear Manual" for details.

Gear cutters are highly professional, for beginners, do not get involved in the content of gear cutters.

FYI.