Spiral bevel gear parameters;
Mainly modulus, pressure angle, helix angle, displacement coefficient, root diameter, tooth height, center distance, tooth thickness, common normal, accuracy grade (mainly tooth shape, tooth direction, radial runout, single tooth error, One week error, etc.)
Please measure two common normals, two common normals with different spans. For example, the small wheel needs to know: the common normal of the two teeth and the common normal of the three teeth
The big wheel is also needed. At the same time, the center distance must be strictly known.
The measurement of the spiral angle of the spiral bevel gear has certain difficulty. If the angle of measurement is not in the case of precision measuring instruments (tooth direction meter, lead gauge, east-west display mirror, etc.), it is difficult to accurately measure the amount. Commonly accepted methods of on-site measurement The common methods for on-site measurement of helical gear helix angles are the universal angle ruler method and the indentation method.
The universal angle ruler method is to measure the angle between the end face and the tooth surface of the measured gear by the universal angle ruler. Since the spiral angle of the gear changes with the radius of the gear, the gear groove of the general gear is narrow and small, and the universal gear is universal. The scale of the angle ruler has a certain width, and the cutter rule cannot be placed in the tooth groove purely, and the position of the index circle is difficult to determine. Therefore, it is difficult to measure the angle accurately.
The indentation method is to make the top of the tooth of the measured gear to be boned on a piece of paper. This paper leaves the traces of the top of the tooth roll, and the extension line of the top line of the tooth is made according to the indentation. After the auxiliary line, the protractor measures the angle of the tooth, which is the helix angle at the top of the gear tooth. Then, according to other geometric parameters of the gear, the helix angle at the gear index circle is calculated. Since the width of the gear is generally not large, the extension line and the auxiliary line have a certain width error. When the angle measuring device measures, it is inevitable that there will be an error, and the scale of the protractor is in units of "degrees", for those ^ to " The measurement of the angle of "and" is not enough.
