What are the process characteristics of spiral bevel gear in precision parts processing:
In precision parts processing, the structural characteristics of spiral teeth are the same as those of straight bevel gears. The standard module of spiral bevel gears refers to the large end module, and the calculation of nominal size is basically the same. The difference is that the gear tooth profile of the former is straight, its pitch bevel gear line (the intersection line between the tooth surface and the pitch bevel gear line) is straight, and the gear tooth profile of the latter is curved, its pitch bevel gear line is arc, 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 rotation direction and helix angle of spiral bevel gears are as follows: when facing the tooth top of the gear and looking along the axis, if the small end of the gear tooth moves counterclockwise along the tooth line to the big end, it is called a left-hand gear; If it is clockwise, it is called right-hand gear.
In precision parts processing, the included angle between the tangent line of a point on the pitch bevel gear line and the pitch bevel generatrix passing through the point is called the helix angle. The helix angle of each point on the tooth rectangle of the spiral bevel gear is not equal, and the helix angle of the midpoint of the tooth surface is the standard helix angle of the spiral bevel gear.