cogs

One. Product Introduction:

Gear is a mechanical element with teeth on the rim that can continuously mesh to transmit motion and power, and the toothed mechanical parts that can mesh with each other are widely used at present.

Two. Basic parameters of the product:

1. Number of teeth Z:

Closed gear transmission generally has a higher speed, in order to improve the stability of the transmission, reduce the impact vibration, the number of teeth is better, the number of teeth is better, the number of teeth of the pinion can be taken as z1 = 20 ~ 40. Open (semi-open) gear transmission, because the gear teeth are mainly worn and failed, in order to make the gear not too small, the pinion does not also choose too many teeth, generally Z1 = 17 ~ 20.

2. Pressure angle α rb=rcosα=1/2mzcosα:

At the tangent point P of the two gear pitch circles, the acute angle sandwiched between the common normal of the two tooth profile curves (i.e., the force direction of the tooth profile) and the common tangent of the two tooth circles (i.e., the instantaneous motion direction at P point) is called the pressure angle, also known as the meshing angle. For a single gear, this is the tooth angle. The pressure angle of a standard gear is generally 20". In some cases, α=14.5°, 15°, 22.50° and 25° are used.

3. Tooth top height coefficient and top clearance coefficient - h*a, C*:

When the two gears are meshed, the tooth top of one gear always enters the tooth root of the other gear, in order to prevent thermal expansion and have space for lubricating oil, the root height is required to be greater than the tooth top height. The tooth top height coefficient and the top clearance coefficient are introduced for the secondary.