Take you to learn industrial gear terms in depth

1.In general, what is the allowable center distance difference of spur gear?

Generally, the tolerance of the reference value is taken as ± 0

2.Axial angle.

The angle between the two shafts of the intersecting shaft gear (umbrella gear) and the intersecting shaft gear (intersecting shaft helical gear and worm and worm gear). Generally 90 °. The magnitude of the shaft intersection angle is an important factor that affects the tooth contact and backlash.

3.Assembly distance (installation distance)

The axial distance from the cone apex of the bevel gear to the locating surface (installation datum plane). The assembly distance is an important dimension that affects the contact and backlash of gear teeth. Small knowledge: assembly distance is called locating distance (mounting distance).

4.What should be the size tolerance of assembly distance (installation distance)?

In order to obtain proper backlash and tooth contact, the tolerance should be as close as possible to 0. It is recommended to use js7-js9 for the tolerance of reference dimension (the tolerance is approximately 0).

5.How to find out the diameter of graduation circle (dp8-15z) of DP spur gear?

Convert DP (diametral pitch) to modulus. M (modulus) = 25.4/dp (diametral pitch > = 25.4/8 = 3.175mm, approximate pitch diameter). Da = 3.175 × 15 = 47.625mm 1 inch = 25.4mm

6.Drum shaped processing.

Trim the tooth shape along the tooth width direction, so that the tooth shape in the center of the tooth width is in a proper drum shape, and prevent the one-sided contact at the end of the tooth from occurring through the drum shape trimming, so that the tooth contact of the gear is concentrated near the center of the tooth. The larger the drum shape is, the smaller the tooth contact area is.

7.Tooth profile modification.

In order to avoid the interference of the tooth top when the gear is meshed, the tooth shape is consciously modified near the tooth top. The purpose of tooth profile modification is the smooth meshing of teeth, which is similar to the drum modification in the direction of tooth profile.

8.Radial pitch

In English gears, the ratio of pi to P (see module), pitch P = π / ρ, in 1 / inch. Conceptually, the diametral pitch is the reciprocal of the modulus in the metric system. Corresponding to the conversion of units, there is the following relationship between the diametral pitch and modulus: P = π / ρ = 25.4/m, where p is diametral pitch (1 / inch); ρ is pitch (inch); m is modulus (mm). The function of diametral pitch P is equivalent to that of modulus m in metric system. In most British gears, gear couplings and ratchets, diametral pitch is a basic parameter. The larger the pitch, the smaller the tooth size (tooth height and thickness). Some countries have standard series values for diametral pitch.

9.Chamfering of tooth top.

The chamfering of tooth top is carried out at the same time of machining teeth.

Its advantages are:

1) . prevent burr, etc. during cutting.

2) . prevent bumps that are easy to occur during use and handling.

Tooth top = the intersection of tooth surface and tooth top surface.

10.Integral herringbone tooth

It is not easy to produce axial force and has high bearing capacity.

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