What are the process characteristics of spiral bevel gears in precision parts machining

In the processing of precision parts, the structural characteristics of spiral teeth are the same as those of straight bevel gears. The standard modulus of spiral bevel teeth refers to the large end modulus, and the calculation of nominal size is also basically the same. The difference is that the tooth direction of the former is straight, and the pitch cone tooth line (the intersection line between the tooth surface and the pitch cone line) is straight, while the tooth direction of the latter is curved, and the pitch cone tooth line is curved, and the tooth surface is convex on one side of the tooth length direction, The other side is concave.

In addition, the pressure angle of spiral bevel gears is specified in the normal direction of gear teeth. The direction of rotation and helix angle of spiral bevel gears are as follows: when facing the tooth top of the gear and looking along the axis direction, if the small end of the Cong gear tooth moves counterclockwise towards the large end along the tooth line, it is called a left-hand gear; If it is in a clockwise direction, it is called a right-hand gear.

In precision parts machining, the angle between the tangent line at a certain point on the pitch cone tooth line and the pitch cone generatrix passing through that point is called the helix angle. The helix angle at each point on the tooth rectangle of a spiral bevel gear is not equal, and the helix angle at the midpoint of the tooth surface is the standard helix angle of the spiral bevel gear.