Types and characteristics of helical bevel gears

First, the type and characteristics of helical bevel gears

Helical bevel gear is the customary name for bevel gears with curved tooth surface joints, also known as spiral teeth.

According to the type of bevel gear tooth surface joint line, there are generally the following three types:

1. Circular bevel gear: The tooth surface joint line is part of the circular arc.

2. Extension of the outer cycloidal tooth bevel gear: The tooth surface joint line is part of the extension of the outer cycloidal line.

3. Quasi-involute tooth bevel gear: the tooth surface joint line is the quasi-involute line.

Depending on the mutual position of the shafts, there are generally the following:

1. The two axes intersect vertically.

2. The axes intersect but are not vertical.

3. Shaft offset.

Classification by tooth height:

1. Equal height bevel gear.

2. Tapering tooth bevel gear.

3. Double retractable teeth.

Second, the characteristics of the helical bevel gear.

Compared to straight-tooth bevel gears, helical bevel gears have the following advantages:

1. Added overlap coefficient. The tooth line of the helical bevel gear is curved, and at least two or more teeth in the transmission are in contact at the same time, reducing the impact, stabilizing the transmission and reducing the noise.

2. Increase the helix angle, increase the overlap coefficient, reduce the load specific pressure, wear uniformly, increase the load capacity, and prolong the service life.

3. The transmission ratio is large, and the number of small gear teeth can reach at least 5 teeth.

4. The gear contact point can be adjusted with the cutterhead radius.

5. It can grind the tooth surface, improve the contact point, improve the roughness of the tooth surface, and reduce the noise.

However, due to the presence of the helix angle of the tooth line, the helical bevel gear generates an axial force during the transmission process, and the appropriate bearing should be selected during use.