Peeling wheel and method for manufacturing a toothing on a gear wheel by skiving

Abstract

The invention relates to a peeling wheel for manufacturing a toothing on a gear wheel by skiving. The peeling wheel includes a toothing, which is formed by a plurality of equally shaped cutting teeth arranged and distributed around the rotational axis of the peeling wheel at a first pitch and at least one deviating cutting tooth, whose shape is different from the shape of the equally shaped cutting teeth. The cutting teeth include cutting edges with which they come into chip removing engagement with the material of the gear wheel during the skiving processing. In order to be able to produce toothings with such a peeling wheel with increased freedom in the design, the invention proposes that the deviating cutting tooth is arranged outside of the first pitch (p). The invention also relates to a method for producing a toothing on a gear wheel by skiving using a peeling wheel.

Claims

1. A peeling wheel for manufacturing a gear wheel toothing on a gear wheel by skiving, wherein the peeling wheel comprises: a toothing, which is formed by a plurality of identically shaped cutting teeth arranged and distributed around a rotational axis of the peeling wheel at a first pitch and by at least two deviating cutting teeth whose shape is different from the shape of plurality of identically shaped cutting teeth, wherein each of the plurality of identically shaped cutting teeth comprises respective cutting edges which engage with material of the gear wheel during skiving, wherein each of plurality of identically shaped cutting teeth has a respective center line extending through the center thereof with respect to a circumferential direction of the peeling wheel, and the first pitch corresponds to a distance between the respective center line of two adjacent cutting teeth of the plurality of identically shaped cutting teeth along the pitch circle of the peeling wheel, wherein each of the at least two deviating cutting teeth is arranged outside of the first pitch, each of the at least two deviating cutting teeth having a respective center line extending through the center thereof with respect to the circumferential direction of the peeling wheel, wherein a first of the at least two deviating cutting teeth is arranged outside of the first pitch such that the corresponding center line of the first of the at least two deviating cutting teeth is shifted out of the first pitch in a rotational direction of the peeling wheel, the rotational direction being a direction in which the peeling wheel rotates about the rotational axis of the peeling wheel during skiving, and wherein a second of the at least two deviating cutting teeth is shifted outside of the first pitch such that the center line of the second of the at least two deviating cutting teeth is shifted out of the first pitch counter to the rotational direction of the peeling wheel.

2. The peeling wheel according to claim 1, wherein a thickness of each of the at least two deviating cutting teeth measured in the circumferential direction of the peeling wheel is greater than the first pitch.

3. A method for manufacturing a gear wheel toothing on a gear wheel by skiving with the peeling wheel according to claim 1, the method comprising: providing the peeling wheel according to claim 1, driving a gear wheel blank to be toothed in a rotating manner about a workpiece rotational axis and driving the peeling wheel in a rotating manner about the rotational axis of the peeling wheel, wherein the workpiece rotational axis and the rotational axis of the peeling wheel are aligned crossing each other at an axis cross angle, and wherein the peeling wheel is brought into engagement with the gear wheel blank such that the plurality of identically shaped cutting teeth and the at least two deviating cutting teeth of the peeling wheel remove material of the gear wheel blank.

4. The method according to claim 3, wherein the first of the at least two deviating teeth machines a tooth flank of a first tooth on the gear wheel blank to be toothed, wherein the second of the at least two deviating teeth machines a tooth flank of a second tooth on the gear wheel blank to be toothed, and wherein the first tooth and the second tooth on the gear wheel blank are separated from one another by a gap, which gap is to be formed on the gear wheel blank and which gap exceeds a tooth thickness of the peeling wheel with respect to the rotational direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail below by means of a drawing illustrating an exemplary embodiment.

(2) FIG. 1a shows a peeling wheel when producing an internal toothing on a gear wheel blank in a first perspective view;

(3) FIG. 1b shows the peeling wheel according to FIG. 1a when producing an internal toothing on the gear wheel blank in a second perspective view;

(4) FIG. 2 shows the peeling wheel according to FIG. 1a, 1b in a frontal view of its one front surface;

(5) FIG. 3 shows the peeling wheel according to FIG. 1a, 1b in engagement with the toothing to be produced on the gear wheel blank in a first operating position;

(6) FIG. 4 shows the peeling wheel according to FIG. 1a, 1b in engagement with the toothing to be produced on the gear wheel blank in a second operating position.

DESCRIPTION OF THE INVENTION

(7) The peeling wheel 1 is held in a conventional manner on a tool spindle of a conventionally structured skiving machine not shown here and is driven in a rotating manner about a peeling wheel rotational axis DS.

(8) In this case, the peeling wheel 1 comprises an external toothing which is formed from a plurality of equally shaped cutting teeth 2, 2a, 2b, 2c, 2d. The equally shaped cutting teeth 2, 2a, 2b, 2c, 2d are arranged at a regular pitch p distributed around the rotational axis DS on the outer circumference of the peeling wheel. The pitch p defined by the arrangement of the cutting teeth 2-2d selected in this way defines the first pitch p of the peeling wheel 1.

(9) In the region of half the circumference of the peeling wheel 1 in each case, a deviating cutting tooth 3, 4 extends in each case on opposite sides of the peeling wheel 1 in regions whose length measured in the circumferential direction U of the peeling wheel 1 extends beyond a pitch p. The thickness of the deviating cutting teeth 3, 4 each occupies a circumferential length which is greater than one pitch p. As such, the deviating cutting teeth 3, 4 form so-called block teeth.

(10) In this case, the one deviating cutting tooth 3 is positioned shifted out of the pitch p counter to the rotational direction D of the peeling wheel 1 in the direction of the equally shaped cutting tooth 2a next-adjacent to it such that the gap 5a between the tooth flank of the equally shaped cutting tooth 2a assigned to the deviating cutting tooth 3 and the tooth flank of the deviating cutting tooth 3 facing it is smaller than the gaps 6 present between the equally shaped cutting teeth 2, 2a, 2b, 2c, 2d next-adjacent to each other.

(11) In a corresponding manner, the other deviating cutting tooth 4 is arranged shifted out of the pitch p in the rotational direction D of the peeling wheel 1 in the direction of the equally shaped cutting tooth 2b next-adjacent to it such that the gap 5b between the tooth flank of the equally shaped cutting tooth 2b assigned to this deviating cutting tooth 4 and the tooth flank of the deviating cutting tooth 4 facing it is smaller than the gaps 6 present between the equally shaped cutting teeth 2, 2a, 2b, 2c, 2d next-adjacent to each other.

(12) For the manufacture of an internally-toothed gear wheel provided with index pockets, a gear wheel blank 10 pre-toothed in a conventional manner is provided and clamped on a workpiece spindle, also not represented here, of the skiving machine not represented. The workpiece spindle drives the gear wheel blank in a rotating manner about a workpiece rotational axis DW. In this case, the workpiece rotational axis DW and the peeling wheel rotational axis DS are aligned in space in a manner known per se for skiving such that they cross each other at an axis cross angle Y. In addition, a drive is provided also in a manner known per se with which the peeling wheel 1 and the gear wheel blank 10 can be adjusted relative to one another.

(13) During skiving processing, the peeling wheel 1 rolls with its cutting teeth 2-2d, 3, 4 such that, with the cutters present on the cutting teeth 2-2d, 3, 4, material is removed in a chip removing manner from the flanks of the teeth 12, 12a, 12b of the internal toothing 11 of the gear wheel blank 10.

(14) As represented in FIG. 3, the first deviating cutting tooth 3 shifted with respect to the pitch p counter to the rotational direction D, due to its arrangement offset with respect to the pitch, only removes material on the tooth flank of that tooth 12a of the internal toothing 11, which delimits the locking groove 13 on its rear side with respect to the rotational direction D, which locking groove is to be manufactured on the gear wheel blank 11 in each case and is designed in the manner of a gap extending beyond a pitch p in the circumferential direction U in terms of its extension.

(15) In contrast, the deviating cutting tooth 4 pushed out of the pitch p in the direction of the rotational direction D, as shown in FIG. 4, exclusively removes material from the tooth flank of the tooth 12b assigned to the respective locking groove 13, which tooth delimits the respective locking groove 13 on its front side with respect to the rotational direction D. Due to the offset arrangement of the deviating cutting teeth 3, 4 and the resulting narrower gaps 5a, 5b of the peeling wheel 1 compared to the gaps 6 between the equally shaped cutting teeth, the teeth 12a, 12b of the gear wheel produced from the gear wheel blank 10, which teeth respectively delimit the index pockets 13, have a smaller thickness d than the teeth 12, which are formed by the equally shaped cutting teeth 2-2d of the peeling wheel 1 on the finished gear wheel.

REFERENCE NUMERALS

(16) 1 peeling wheel 2, 2a-2d equally shaped cutting teeth of the peeling wheel 1 3, 4 deviating cutting teeth of the peeling wheel 1 5a, 5b gap between the tooth flank assigned to the deviating cutting teeth 3, 4 and the respectively next-adjacent equally shaped cutting tooth 2a, 2b 6 gaps between the equally shaped cutting teeth 2, 2a, 2b, 2c, 2d next-adjacent to each other 10 gear wheel blank 11 pre-toothed internal toothing of the gear wheel blank 10 12, 12a, 12b teeth of the internal toothing of the gear wheel blank 10 13 index pockets (wide gap) d thickness of the teeth 12a, 12b on the gear wheel completely formed from the gear wheel blank D rotational direction of the peeling wheel 1 DS peeling wheel rotational axis DW workpiece rotational axis p first pitch of peeling wheel 1 U circumferential direction of the peeling wheel 1 Axis cross angle