Abrading – Abrading process – Gear or worm abrading
Patent
1993-07-08
1995-05-02
Rose, Robert A.
Abrading
Abrading process
Gear or worm abrading
451 56, 125 1101, 125 1104, B24B 53075
Patent
active
054114314
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for grinding crown wheels, with the aid of a hobbing grinding disc.
Crown wheels are gear wheels which are used in angle drives with or without intersecting axes which may or may not form an angle of 90.degree. with each other. In this drive a cylindrical pinion meshes with a crown wheel whose tooth shape is determined by the tooth shape of the cylindrical pinion, the gear ratio and the position of the gear wheels relative to each other.
The angle drive with crown wheel teeth has a number of special advantages over the bevel gear drive generally known and used, such as the absence of any need for axial adjustment of the cylindrical pinion, a greater gear ratio being achievable, and the fact that a great transverse contact ratio can be achieved without special provisions.
The absence of an economically feasible and at the same time accurate manufacturing method was, however, one of the greatest disadvantages until now for a general use of the crown wheel gearing in highly loaded constructions.
The object of the present invention is to provide a method for grinding crown wheels, by which accurate crown wheels can be obtained, and which is economically advantageous.
This object is achieved by the method for grinding crown wheels with the aid of a hobbing grinding disc, comprising the following steps:
a) forming the hobbing grinding disc as follows: element of ceramic material whose external dimensions correspond essentially to the external dimensions of the hobbing grinding disc to be formed, and which is mounted on the grinding wheel shaft of a grinding machine; workpieceholder of the grinding machine, which tooth is in principle the same shape as the teeth of a crown wheel to be ground and is of such length that the crown wheel tooth contains at least all pressure angles which are present on the teeth of the crown wheel to be ground, while the surface of the crown wheel tooth is provided with a dressing material, and the crown wheel tooth is mounted in such a way on the workpieceholder that the axis of a crown wheel of which the crown wheel tooth could form part coincides with the axis of rotation of the workpieceholder; and thus of the crown wheel tooth, intersecting each other at right angles; wheel tooth being such that per revolution of the grinding disc element the crown wheel tooth rotates over one or more tooth pitches about the axis of the workholder; element and the rotating crown wheel tooth in such a way that the crown wheel tooth works the peripheral surface of the rotating grinding disc element, while the crown wheel tooth comes into contact over its entire length and height with the grinding disc element, and a hobbing grinding disc with an essentially helical peripheral profile of a shape required for grinding the crown wheel is formed;
b) with the thus formed hobbing grinding disc, grinding the crown wheel mounted on the earlier mentioned workpieceholder, the hobbing grinding disc and the crown wheel being rotated and moved relative to each other in principle in the same way as the grinding disc element and the earlier mentioned crown wheel tooth during the formation of the hobbing grinding disc;
c) resharpening (dressing) the hobbing grinding disc when it has become blunt, using the crown wheel tooth provided with a dressing material and mounted on the workpieceholder, in the same way as forming of the hobbing grinding disc.
Due to the fact that the hobbing grinding disc is formed on the same grinding machine as that on which the crown wheel to be ground is ground, while the grinding disc always remains mounted on the grinding wheel shaft of the machine and the crown wheel tooth for forming or sharpening the hobbing grinding disc and the crown wheel to be ground are mounted on the same workpieceholder, crown wheels with very great accuracy can be obtained more cheaply.
The invention will be explained in greater detail in the description of a preferred embodiment of the method according to the invention which follows, with reference to the appended drawing.
REFERENCES:
patent: 1759333 (1930-05-01), Wildhaber
patent: 2304586 (1942-12-01), Miller
patent: 2309530 (1943-01-01), Perkins
patent: 2711673 (1955-06-01), Miller
patent: 5020279 (1991-06-01), Abysov
patent: 5079877 (1992-01-01), Abysov
Basstein Augustinus F. H.
Uittenbogaart Gustaaf A.
Crown Gear B.V.
Rose Robert A.
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