DE8516097U1 - Wheel disc, especially multiple V-belt pulley - Google Patents

Description

"Wheel disc, in particular multi-'V-belt pulley

The invention relates to a wheel disc, in particular a multiple V-belt pulley, which has been profiled from a disc blank by splitting and subsequent cold forming.

I A number of such wheels are known. The

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A multiple V-belt pulley is produced by first splitting the outer edge of the pulley blank and then rolling and profiling this split area in several steps. The edge rings created by splitting are initially compressed at least in some areas so that the multiple V-profile can then be rolled in.

The splitting of single-profile panes is also known, for example, from GB-PS 1 024 282 or, in the case of multi-profile panes, from French utility model 82 09 541.

What the known disks have in common is that the disk blank must have a wall thickness that enables splitting as the first step in the process. This means that a certain weight can be achieved simply by the thickness of the disk blank.

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iinges specified / which cannot be undercut for manufacturing reasons.

In principle, it is also known to split material-thickened areas in order to be able to process them further. In the manufacture of car wheel rims, the thickened outer edge areas are formed during the manufacture of the initial blanks, e.g. by drop forging, for example DE-AS 1 060 654, DE-PS 1 908 565 or US-PS 2 075 294 and FR-PS 1 491 895.

Subsequent upsetting of an outer edge area is also known from the old German patent specification 227 171, which concerns the thickening of the teeth of chain edges for bicycles. There, after the toothing has been introduced, this part of the chain wheel is thickened by upsetting the tooth area.

The object of the invention is to create a solution with which a weight reduction can be achieved despite the previously discussed limitations, whereby the wall thickness of the disk blanks required for splitting can be undercut from the outset.

In a wheel disc of the type, this object is achieved according to the invention in that the outer edge-side profile

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filbereich from an area of greater wall thickness than the disk blank, initially created by upsetting, the subsequent splitting of this thickened outer edge area and the subsequent final pffüfil IcE ^- CU of this area vjcfcjiidct 1st·

This design means that round blanks or disc blanks can be used as the starting material - the wall thickness of which is only determined by the transmission of the torque with the corresponding wheels, i.e. the wall thickness of which can be much smaller than would be necessary for splitting. This allows a very significant saving in weight and material.

In a very important embodiment, the invention provides that the wall thickness of the flange formed by the blank is smaller than the material thickness required for splitting. What is important with this wheel disc is of course that the disc blank was available as a flat or profiled sheet metal disc as an initial product, i.e. not as a cast or drop-forged part.

In the above-mentioned DE-AS 1 068 654 it is stated that it is not possible to form vehicle rims made of light metal by splitting and then rolling them out.

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It has been shown that this prejudice is unjustified. According to the invention, it is therefore also provided that the wheel disc is made from a blank made of light or non-metallic metal.

Preferably, the wall thickness of the blank is less than or equal to 2.5 mm.

The invention is explained in more detail below with reference to the drawing.

Figs. 1 to 7 show individual cross sections of a wheel disc according to the invention after individual processing steps.

Fig. 1 shows a round blank or disk 1, the wall thickness of which is marked with "x" and in the example shown should be of such a size that splitting in the conventional way is no longer possible. This dimension would be around 2.3 mm for sheet steel, for example / for other materials this dimension is of course different.

In order to enable splitting, the disk blank is compressed on the outer edge. This area is marked 2 in Fig. 2. In Fig. 2, the wall thickness of this outer edge area 2 is marked "y".

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example shown is twice the wall thickness "x" j

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This edge is then split to create two rings 3 and 3" whose wall thickness again has the dimension "x".

Fig. 4 to 7 show the rolling out of this edge region 2 and the profiling into a profile shape 4 according to Fig. 6 or a profile shape 5 according to Fig. 7.

From the figures it can be seen that the one marked 6

Flange of the wheel disc, which has the unchanged wall thickness "x" ; of the disc blank 1.

Not shown in the figures is the possibility of splitting off-center, so that the rings 3 and 3' have different wall thicknesses, so that the profile area can be rolled out asymmetrically.

Of course, the embodiment described can be modified in many ways without departing from the basic idea of the invention. In particular, the invention is not restricted to the use of a specific material .

nor to the profile shapes shown in the figures;

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Claims (4)

&bull; · &igr; ■··■■·· ■· · PATENT ATTORNEYS MEINKE AND DABRINGHAUS ADMITTED TO THE EUROPEAN PATENT OFFICE · EUROPEAN PATENT ATTORNEYS · MANDATA[RES EN BREVETS EUROPEB DIPL.-ING. J. MEINKE
DIPL-ING. W. DABRINGHAUS Applicant: Winkelmann & Pannhoff GmbH,
Schmalbachstrasse 2 , 4730 Ahlen Claims: 1. Wheel disc, in particular multiple V-belt pulley, which is produced from a disc blank by splitting and subsequent
Cold forming profiled before, characterized, that the profile area on the outer edge is formed from an area (2) of greater wall thickness than the disc blank, initially created by upsetting on the disc blank (1), the subsequent splitting of this thickened outer edge area (2) and the subsequent final profiling of this area. 2. Wheel disc according to claim 1,
marked by this, that the wall thickness (x) of the flange formed by the blank (1) is smaller than the material required for splitting 4600 DORTMUND 1, 02. Dec. 87 westenhellwe _G 67 _j TELEPHONE (02 31) 14 50 71 TELEGRAM DOPAT Dortrnunc ¹ TELEX 822 7328 pat d FAX (02 31) 14 76 70 FILE NO: 138/5105 &bull; II I Il &Mgr; in &bull; ti 1111 It 1 &bull;lit > 1 &igr; * t ■ 1 1 ) I 11)11 strength. 3. Wheel disc according to claim 1 or 2, characterized in that it is formed from a blank made of light or non-ferrous metal. 4. Wheel disc according to claim 3 made of steel, characterized in that the wall thickness of the blank is less than or equal to 2.5 mm. · t * * t t ·· it * i suffered * &igr; 1 1 i <iii t · · I * 4 « I I I I I