Method and device for producing a gear together with a clamping means

Patent metadata

Field	Value
Publication number	US-10363598-B2
Application number	US-201515120234-A
Country	US
Kind code	B2
Filing date	Feb 20, 2015
Priority date	Feb 21, 2014
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

The invention relates to a method for producing at least one gear, in particular a helically toothed gear, wherein the gear is produced from a gear blank pressed and sintered with an oversize in the region of the set of teeth, wherein the gear blank has two opposite end faces and a circumference. In the method, the gear blank is clamped in a clamping means. The gear blank is compressed in the region of the oversize by means of the engagement of at least one circumferential tool having a set of mating teeth that engages with the set of teeth of the gear blank, wherein the gear blank is radially clamped over the circumference by the clamping means at both end faces during the compression of the gear blank, wherein each individual tooth of the set of teeth of the gear blank is supported by the clamping means substantially over the entire tooth height. In this way, the quality of the set of teeth can be improved. The invention further relates to a device and to a clamping means.

First claim

The invention claimed is:

1. A method for producing a gear wheel, in particular a helical gear wheel, wherein the gear wheel is produced from a gear-wheel blank which is sintered and in which a toothing is pressed so as to be oversized, wherein the gear-wheel blank has two mutually opposite end sides and one circumference, the method comprising the following method steps:
clamping the gear-wheel blank in a clamp,
compressing the gear-wheel blank in the toothing by engaging at least one revolving tool having a counter-toothing which engages in the toothing of the gear-wheel blank,
wherein the gear-wheel blank during compression thereof at both end sides is radially clamped across the circumference by the clamp,
wherein each individual tooth of the toothing of the gear-wheel blank is supported by the clamp substantially across an entire tooth height;
wherein the clamp has a toothing geometry which is identical to that of the gear-wheel blank.

2. The method as claimed in claim 1 , wherein the gear-wheel blank is axially jammed.

3. The method as claimed in claim 1 , wherein at least two gear-wheel blanks are clamped in the clamp, in order for at least two gear wheels to be produced.

4. The method as claimed in claim 3 , wherein an engagement of the at least one revolving tool in the toothing of the at least two gear-wheel blanks is performed simultaneously or successively.

5. The method as claimed in claim 1 , wherein the toothing geometry of the clamp has an equidistant undersize in which the toothing geometry of the clamp tapers off in an axial direction.

Assignees

• Gkn Sinter Metals Engineering Gmbh

Inventors

• Kotthoff Gerhard
• Leupold Björn
• Wattenberg Frank

Classifications

• B22F5/085

  with helical contours · CPC title

• B21H5/022 Primary

  Finishing gear teeth with cylindrical outline, e.g. burnishing · CPC title

• B22F5/08

  of toothed articles, e.g. gear wheels; of cam discs · CPC title