Cutters – for shaping – Gear cutting tool – Hob
Patent
1992-03-27
1994-02-22
Kisliuk, Bruce M.
Cutters, for shaping
Gear cutting tool
Hob
407 20, B26D 114
Patent
active
052881792
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a cutter for producing face gears, in particular a hob.
Face gears are gears which are used in angle drives with axes which may or may not intersect each other and may or may not form an angle of 90 degrees with each other. In this drive a cylindrical pinion meshes with a face gear whose teeth shape corresponds to the teeth shape of the cylindrical pinion.
The angle drive with face gear gearing has a number of special advantages compared with the generally known and used bevel gear drive, such as, inter alia, the absence of axial forces on the cylindrical pinion when it is designed with spur teeth, a greater transmission ratio being possible, the relatively simple adjustment, and a great transverse contact ratio which can be achieved without special facilities.
The absence of an economically feasible, and in addition accurate, manufacturing method was, however, hitherto one of the greatest problems for general use of the face gear gearing in highly loaded constructions. The absence of suitable manufacturing equipment played a major role in this.
The use of generating tools, by means of which face gears can be produced in a continuous process, is in practice a condition for the economic production of face gears and for a wider use of face gears in highly loaded and/or fast-running constructions.
A hobbing cutter for producing face gears is known from U.S. Pat. No. 2,304,586 (Miller). This cutter is a disc-shaped cutter body with cutting teeth provided on the periphery. The cutting edges of these cutting teeth are situated in a surface of revolution which is produced by turning an imaginary gear wheel of infinitely low thickness about the axis of the cutter body and simultaneously about its own axis, during which the imaginary gear wheel on one revolution about the axis of the cutter body turns about its own axis through an angle which is equal to a whole number of times the pitch angle of the imaginary gear wheel, and the plane of the imaginary gear wheel always extends in the radial direction of the cutter body and at right angles to the path described by the teeth of the imaginary gear wheel.
The cutting teeth are provided with clearance faces in the same way as ordinary cutting teeth of a cutter.
The known cutter has, however, the disadvantage that during the re-grinding of the cutting teeth the shape of the cutting edge of the cutting teeth changes, so that the shape of the face gear teeth formed with the re-ground cutter will also change. This is undesirable.
SUMMARY OF THE INVENTION
The object of the invention is to provide a hobbing cutter for producing face gears which can be re-ground without the shape of the cutting edge of the cutting teeth changing.
This object is achieved by a cutter for producing face gears of the known type in which each cutting tooth of the cutter forms an integral part of the cutter body, and is of such a shape that the profile of the cutting tooth in radial planes going through the axis of the cutter is always the same. The profile of the cutting tooth in these planes shifting from the cutting edge of the cutting tooth to the rear side thereof in the direction of the axis of the cutter.
The object of the invention is also achieved by a cutter for producing face gears of the known type, in which each cutting tooth of the cutter is formed by a separate cutting blade which is fixed on the periphery on the cutter body and is of such a shape that the profile of the cutting tooth in planes running parallel to each other and parallel to the axis of the cutter is always the same. The profile of the cutting tooth in these planes shifts from the cutting edge of the cutting tooth to the rear side thereof in the direction of the axis of the cutter.
The cutter according to the invention can be re-ground without the shape of the cutting edge of the cutting teeth changing. This makes it possible with a re-ground cutter to produce face gears with exactly the same tooth shape as before re-grinding.
BRIEF DESCRIPTION OF THE DRAWINGS
REFERENCES:
patent: 2456842 (1948-12-01), Rutbell
patent: 2706848 (1955-04-01), Riley
patent: 3740808 (1973-06-01), Shioya
Cuypers Martinus H.
Seroo Jan M.
Crown Gear B.V.
Kisliuk Bruce M.
Reichenbach Bryan
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