Toothed wheel arrangement and method for producing a bayonet fastening

Patent metadata

Field	Value
Publication number	US-9297451-B2
Application number	US-201113823898-A
Country	US
Kind code	B2
Filing date	Sep 27, 2011
Priority date	Sep 29, 2010
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

The invention relates to a toothed wheel arrangement ( 1 ) comprising a main toothed wheel ( 2 ) and a toothed wheel ( 4 ) that can be rotated relative thereto in the circumferential direction ( 3 ), wherein the main toothed wheel ( 2 ) comprises a toothed wheel body ( 25 ) on which a hub ( 5 ) is arranged in a projecting manner in the axial direction so as, firstly, to accommodate a shaft and, secondly, to arrange the rotatable toothed wheel ( 4 ) thereon, for which purpose the rotatable toothed wheel ( 4 ) has a cutout ( 17 ) coaxial to an axially extending center axis of the main toothed wheel ( 2 ), and wherein the main toothed wheel ( 2 ) is connected to the rotatable toothed wheel ( 4 ) by means of a bayonet fastening ( 14 ). The bayonet fastening ( 14 ) is formed between the hub ( 5 ) and the rotatable toothed wheel ( 2 ) and/or between the hub ( 5 ) and a spring element ( 9 ) bearing on the rotatable toothed wheel ( 4 ).

First claim

The invention claimed is:

1. A toothed wheel arrangement comprising a main toothed wheel and a toothed wheel rotatable relative to the latter in circumferential direction, wherein the main toothed wheel comprises a toothed wheel body, on which a hub projecting in an axial direction is arranged on the one hand for mounting a shaft and on the other hand for the arrangement of the rotatable toothed wheel, wherein the rotatable toothed wheel has a cut-out coaxial to an axially running central axis of the main toothed wheel, and the main toothed wheel is connected to the rotatable toothed wheel via a bayonet fastening, wherein radially outwards projecting hub projections are arranged on the hub, wherein in the axial direction between the hub projections and the toothed wheel body an undercut is formed in the direction of the circumference of the hub, wherein in the cut-out of the rotatable toothed wheel or in a cut-out of a spring element bearing on the rotatable toothed wheel radially inwards projecting projections are formed and the bayonet fastening is formed between the hub projections of the hub and the projections of the rotatable toothed wheel or between the hub projections of the hub and the projections of the spring element, wherein an inner diameter between two opposite projections has a size which corresponds to an outer diameter of the hub in the area between cut-outs, wherein said cut-outs are formed in a circumferential direction between two adjacent hub projections on the hub, and wherein the undercut extends continuously over the circumference of the hub.

2. The toothed wheel arrangement as claimed in claim 1 , wherein the hub projections are arranged distributed symmetrically over the circumference of the hub.

3. The toothed wheel arrangement as claimed in claim 1 , wherein the hub projections in the circumferential direction of the hub have a total length which is between 20% and 80% of the length of the circumference of the hub.

4. The toothed wheel arrangement as claimed in claim 1 , wherein the hub projections as viewed in the axial direction have at least partly a trapezoidal cross section.

5. The toothed wheel arrangement as claimed in claim 1 , wherein at least one of the spring element and the rotatable toothed wheel has an anti-twist lock.

6. The toothed wheel arrangement as claimed in claim 5 , wherein the anti-twist lock is formed by at least one tab which engages in a cut-out of the rotatable toothed wheel.

7. The toothed wheel arrangement as claimed in claim 5 , wherein the anti-twist lock is formed by at least one projection on the spring element or on the rotatable toothed wheel.

8. The toothed wheel arrangement as claimed in claim 1 , wherein a transition is formed between an end face of the hub and the circumferential surface in the area of the hub projections to be rounded or beveled.

9. A method for producing a bayonet fastening for a toothed wheel arrangement comprising a main toothed wheel and a toothed wheel rotatable relative to the latter in a circumferential direction, wherein the main toothed wheel has a toothed wheel body, on which projecting in axial direction a hub is arranged on the one hand for mounting a shaft and on the other hand for the arrangement of the rotatable toothed wheel, wherein the rotatable toothed wheel comprises a cut-out coaxial to an axially running central axis of the main toothed wheel, and wherein it comprises the steps:
sintering a one-piece preform for the main toothed wheel from the toothed wheel body and the hub, wherein on the circumference of the hub starting from an end face of the hub, cut-outs are formed running in an axial direction to the toothed wheel body, which cut-outs extend up to a cut-out end wall opposite the end face of the hub in the axial direction, and which each have two side walls and a base surface, wherein at least one of the side walls forms an angle with the base surface of the cut-out, which is greater than 90°; and
machining the hub in the circumferential direction, whereby the cut-out end walls are removed and partly undercuts are formed, whereby hub projections are formed which form a part of the bayonet fastening.

10. The method as claimed in claim 9 , wherein the angle between the at least one side wall and the base surfaces is selected from a range with a lower limit of 95° and an upper limit of 130°.

11. The method as claimed in claim 9 , wherein at least individual edges of the cut-outs are shaped to be rounded or beveled.

12. The method as claimed in claim 9 , wherein the rotatable toothed wheel is also produced by sintering, and wherein radially inwardly running projections are formed in the cut-out of the toothed wheel.

13. The method as claimed in claim 12 , wherein on an end face of the rotatable toothed wheel running in radial direction an annular web is formed.

Assignees

• Buchleitner Helmut
• Dickinger Karl
• Mueller Alexander
• Siessl Wolfgang
• Miba Sinter Austria Gmbh

Inventors

• Buchleitner Helmut
• Dickinger Karl
• Mueller Alexander
• Siessl Wolfgang

Classifications

• B22F5/08

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

• Y10T74/19916

  Multiple disks · CPC title

• F16H55/18 Primary

  Special devices for taking up backlash {(for gears having orbital motion F16H1/2863)} · CPC title

• F16H55/17 Primary

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title