DE1210261B - Securing on a split bearing shell arranged in a split bearing housing against radial displacement of the two shell parts against one another - Google Patents

Description

Securing to a split arranged in a split bearing housing Bearing shell against radial displacement of the two shell parts against each other The invention relates to a fuse on a bearing housing arranged in a split split bearing shell against radial displacement of the two shell parts against each other.

In internal combustion engines of large dimensions, by assembly or the forces occurring during operation may cause such large deformations occur in the area of the crankshaft bearings that a snug fit of the outer surfaces the crankshaft bearing shells is not guaranteed.

This can lead to mutual displacements of the upper shell against the lower shell or also lead to entanglement of the two bearing shell halves against each other, which prevents proper formation of the lubricating oil film in the bearings will.

Attempts have therefore already been made to eliminate this disadvantage, the the two bearing shells against each other, e.g. by means of a toothing that runs parallel runs to the crankshaft axis. Vertical dowel pins are also suitable for this purpose have been provided, but the latter have the disadvantage that a lifting of the upper Bearing shell from the lower is no longer possible if the pins are not accurate stand parallel to each other. In addition, there were already horizontal dowel pins in the separating layer used. However, all of the designs mentioned have the disadvantage that between and bottom shell no more shims can be arranged. Such are however Useful for larger engines, as there is greater wear on the bearings allows by from time to time by removing the shims the upper bearing shell added, thus avoiding excessive bearing play and excessive oil loss will.

This deficiency can occur with a security of the type mentioned at the beginning can be remedied according to the invention in that the interface between the upper and lower shell is stepped in a manner known per se, the upper shell only in the middle (step) part and on the inner one directed towards the pin Part of the separating surface rests on the lower shell and also the inner ones Parts of the step-shaped parting surfaces, as known in the case of flat parting surfaces, in cross section Roof-like inclined under a centri of approximately 120 'to each other are. This measure allows both bearing shells to move in the radial direction prevented by the occurring pressure forces and a snug fit of the bearing shells guaranteed at the camps themselves.

In the case of one-piece connecting rod bearings, it is known that the bearing shells to be provided with step-shaped separating surfaces. In the case of one-sided printing, however, this is the case not to prevent radial movement of the shell with the internal guides. In order to prevent the bearings from breathing, it has also already been proposed to use the bearing separating surfaces to be arranged inclined to one another in the cross-section. This also known However, the measure requires a considerable effort for the processing of the mating surfaces, it can also be used on the other hand with the application of this measure for bearing shells the radial movement of the bearing shells relative to one another cannot be eliminated in all cases. Rather, this success is only achieved through the use of those listed in the claim Mercinal combination reached.

An exemplary embodiment of the invention is shown in the drawing. It shows F i g. 1 to 3 partial sections perpendicular to the axis in different planes of a bearing lock according to the invention.

The bearing shown is essentially in a known manner from the upper bearing cover 1 and the lower bearing cover 2, the upper bearing shell 3 and the lower bearing shell 4. The parting surface of the two bearing shells 3, 4, as with the lines 5, 5 ', 6, 6 " and 7, 7' indicated, step-shaped. From the drawing it can be seen that the upper shell apart from along the surfaces 6, 6 ' in the middle part only on the inner surfaces 7 directed towards the pin 8 , 7 'rests on the lower shell, while the outer surfaces 5, 5' of the two shells have a small distance a from each other. the surfaces 7, 7 'are opposed to the surfaces 5, 5' and to the horizontal below. an angle ot .. from about 301 inclined in cross-sectional shape of a roof As seen from the Figure 1 it can be seen shims 9 may be fastened with the aid of a steel cover plate 10 by means of screws 11 on the upper shell -. the steel plate - 10 serves for receiving the thread for the - Fastening screw. To fix the shims, as shown in FIG . 2 can be seen, Bundbplzeii 1,2 . used to prevent that di # shims move inwardly and thus can strip the shaft journal, whereby the stripped oil film and lubricant would be impaired.

In the case of bearing shells without a lateral collar, the axial displacement is prevented by bolts 13 which are perpendicular to the separating surface and which are firmly inserted into the upper shell 3 and engage with their free ends in bores or grooves 14 of the lower shell.4. Of course, these bolts can also be fastened in the lower shell, just as the shims can be screwed to the lower shell instead of the upper shell.

Claims (2)

. Claims :. 1. Backup to one in one. split bearing housing arranged split bearing shell against radial displacement of the two shell parts against each other, characterized in that the separating surface between the upper and lower shell, is stepped in a known manner, the upper shell only in the middle (step) part and on the inner , part of the separating surface directed towards the pin rests on the lower shell and, furthermore, the inner parts of the step-shaped separating surfaces, as known in the case of flat separating surfaces, are arranged in a roof-shaped inclined cross-section at a center of approximately 1201 to one another. 2. Fuse according to claim 1, characterized in that .. that on the inner surface of the upper shell known shim plates are attached. 3. Fuse according to claim 1 and 2, characterized in that the shims are screwed with the help of a steel cover plate with the upper shell. 4. Fuse according to claim 1, characterized in that between the upper shell -and the shim plates fitting- expediently collar bolts are arranged. 5. Fuse according spoke 1, characterized in that bolts or screws are provided in the outer part of the parting surfaces, which are fastened with one end in the upper or lower bearing shell and with the . the other end engage in bores or grooves of the other bearing shell in order to prevent axial movement of the two shells against one another. Considered publications: Deutsche Patentschriften..Nr; ... 834624, 555120; Austrian Patent No. 97,050; U.S. Patent No. 1361319.