Oh steep unit.

[0001] The invention concerns an oh steep unit containing oh-steeply, whereby that exhibits oh-steeply a connecting piece for the admission of a guide tube and a guide tube. Such a oh steep unit is a component of an axle in particular a rear axle for a supporter.

A well-known construction of axles consists welding of it guide tubes directly to the semi-trailing arms and the knuckles for the admission of the wheel carriers likewise to the semi-trailing arms. The parts which can be welded are usually made of steel. By means of a continuous connecting tube, into which reciprocally a guide tube with welded semi-trailing arms and knuckle is put, an axle is formed. Unfavorably at such an axle the high expenditure of time is by welding the individual parts with one another and accordingly the high costs of the production of such an axle.

The expenditure of welding can be saved by a casting, i.e. that the lengthening steering wheel and the knuckle are formed by a cast part. However then the problem of the attachment of the guide tube, there the high carbon content of the cast part a weld, places itself which corresponds to the requirements so well verunmöglicht.

The DE 10 2009 019,320 A1 describes a compound steering wheel rear axle with which two poured semi-trailing arms for the admission of wheel carriers by a transverse profile is connected. The connection is produced by electromagnetic pulse welding. Among other things a material-conclusive connection is produced by welding.

To the fact it is unfavorable that around a good material conclusion to obtain, the surface quality like also the dimensions of the parts which can be welded must being very exact, whereby a use of the cast parts in the Rohzustand is verunmöglicht. Besides the high risk of cracking exists with welds of cast parts. A further disadvantage consists of it that the coil must produce around the electromagnetic field for the weld be two-piece, otherwise read itself the axle after welding the second semi-trailing arm any longer from the coil does not remove, which complicates the structure of the coil.

An oh steep unit and an associated procedure are to be suggested to task of the invention, which does not exhibit material-conclusive placing and thus unfavorable Gefügeveränderungen are avoided. Besides the manufacture times for an axle are to be minimized and saved thus costs.

This task is solved according to invention by the fact that the guide tube on the connecting piece of the oh part is arranged and is connected by transforming purely positively with the connecting piece. Because a material conclusive connection is avoided, it is possible a cast part as oh steep unit to plan with which the guide tube is connected, without the risk of cracking develops.

Transforming the guide tube is electromagnetically accomplished. Reforming process and/or adding procedure basedly on it that the material of the magnetically subjected component, here the guide tube, over which apparent yielding point is vividly deformed outside and thus a form closure with the connecting piece obtains, is a material conclusion thereby unwanted. Besides can on a cutting treatment of the connecting piece forgave to become, since no high requirements are against the surface quality like also not against the dimensions of the parts which can be connected posed. The cross section of the connecting piece exhibits a form according to invention, which makes a positive connection possible between the guide tube and the connecting piece. The cross section is preferably polygonförmig, in particular a square of which is generally tailliert, whereby the corners can be rounded off. Exactly the same a round cross section is suitable. Also connecting pieces, which have an extent, which exhibit a wavily running circle extent, can likewise are used. An optimal form closure can be produced by the arrangement of the form of the connecting piece, for that ensured that the connection between connecting pieces and/or oh-steeply and guide tube meet the requirements.

A preferential execution form of the connecting piece consists arranging of it the connecting piece conical.

The invention extends further to a procedure for the production of an appropriate oh steep unit containing oh-steeply, whereby that exhibits oh-steeply a connecting piece for the admission of a guide tube and a guide tube, whereby the guide tube on the connecting piece is arranged and transformed there, so that a form closure develops.

Preferably the guide tube is accomplished by electromagnetic transforming, for example by Electro Magnetic Forming (EMF).

The invention is characterised additionally by the fact that oh-steeply by pouring one manufactures and thus is oh-steeply one-piece.

A remark example of the invention is described on the basis the figures, whereby the invention is not only limited to the remark example. Show:

Fig. 1 Fig. 2 a profile by an oh steep unit according to invention on a side of an axle of a supporter and a cross section by the joint of the guide tube with the connecting piece.

In Fig. 1 represented design shows an oh steep unit according to invention 1, is inserted which into the connecting tube 6. An axle, preferably an axle of a supporter exhibits a connecting tube 6, at which reciprocally an oh steep unit 1 is put in. Oh-steeply 2 preferably exhibits a knuckle 4, to which a wheel carrier is appropriate for the swivelling storage of the vehicle wheel (not represented). Oh-steeply 2 exhibits besides a connecting piece 3, which serves 5 for the admission of the guide tube. Oh-steeply the 2 is preferably a one-piece cast part. Owing to the production of the oh part of 2 by a casting process that can be manufactured oh-steeply 2 one-piece, which brings high saving of time in the comparison with oh steep units, which are multipart and which must be welded together individual parts. At the connecting piece 3 the guide tube 5 is arranged, is positively connected to which by transforming with the connecting piece 3. Important participates that no material conclusion needed, since a material conclusion in connection with cast parts, in it that cast material exhibits a high carbon portion and exhibits brittle phases, is inclined to the strong cracking with welds. The moreover one a cutting treatment is compellingly necessary for a welded joint, since a good surface quality as well as exact dimensions are conditions for a good welded joint. That makes a treatment of the oh part compellingly necessary with conventionally manufactured axles, which are connected by a material conclusion. Because with the available invention without a material conclusion one does, can be shortened by the saving of the treatment the manufacture time. Transforming and/or adding the guide tube electromagnetically preferably takes place via Electro Magnetic Forming (EMF). The connecting piece 3 does not need cutting treatment after the casting process, there no high requirements to the surface quality as also not to the accuracy of the dimensions posed is around a positive connection to be obtained. The connecting piece 3 exhibits a cross section, which makes a positive connection possible. Preferably the connecting piece 3 exhibits a polygonförmigen cross section, which is for example generally tailliert, as in Fig. 2 represented. The guide tube 5 exhibits a cross section, by which push a problem-free onto the connecting piece 3 is possible. That is, that the guide tube 5 exhibits, a sufficient large inside diameter around it onto the rough connecting piece 3 to push. The form of the cross section of the guide tube 5 knows that of the connecting piece 3 a round cross-sectional shape of the guide tube 5 is conceivable accordingly or also, since by the reforming process the guide tube within the range of the joint adapts to the connecting piece 3 optimally. As the further conceivable form and/or outline of the connecting piece 3 would be those that the extent of the connecting piece 3 exhibits a wavily running circle extent.

Besides the connecting piece 3 is preferably conical trained. A special arrangement consists of the fact that the cone of the connecting piece becomes toward oh-steeply narrower.

The procedure of the available invention is characterised by it that as already first mentioned, oh-steeply 2 over again after pouring will not work must around a positive connection with the guide tube reach, which the demanded requirements corresponds. The guidance profile 5 located on the connecting piece 3 is connected by transforming and/or adding exclusively positively with the connecting piece 3. Transforming and/or adding is electromagnetically reached, preferably by Electro Magnetic Forming. Oh-steeply first by a casting process manufactured also different procedures are well-known and usable.

By the procedure according to invention the possibility exists to plan a one-piece coil for the production of the electromagnet field. The oh steep unit 1 can be pulled after transforming and/or adding problem-free out of the coil, since transforming takes place only on a side of the guide tube 5. For the formation of the axle the guide tube 5 afterwards into a connecting tube 6 is put, where no more reforming process takes place.

Reference symbol list

1 oh steep unit 2 oh-steeply 3 connecting pieces of 4 knuckles guide tube 6 connecting tube