DE102013203565A1 - Method for assembling split-type radial bearing for crankshaft of combustion engine, involves applying adhesive on parting surfaces of bearing cap and bearing base, so that bearing cap and base are braced against each other by screw - Google Patents

Abstract

The method involves bracing parting surfaces (2',3') of a bearing cap (2) and bearing base (3) against each other by a screw. A surface depression is formed in one of the parting surfaces of bearing cap and bearing base. An adhesive is applied on the parting surfaces, so that the bearing cap and the bearing base are braced against each other by using the screw. An independent claim is included for split-type radial bearing crankshaft of combustion engine.

Description

The invention relates to a method for mounting a split wheel bearing with the features of the preamble of claim 1 and a split radial bearing with the features of claim 6, prepared by the method.

Dynamic forces on the main bearing of the crank mechanism of an internal combustion engine are usually intercepted by means of complicated Verschraubungskonzepte. Examples of this are the combination of straight (vertical) and helical screw connections. An example of this is from the German Offenlegungsschrift DE 10 2007 037 461 A1 known.

The disadvantage here is that horizontal forces, d. H. the forces in the direction of the parting plane are only incompletely intercepted with helical screw connections. This leads to horizontal micromovements in the parting plane which leads to galling, also called fretting, which in turn can lead to cracks in the bearing block.

Another way to intercept horizontal forces is to structure the separation surface of the bearing block and / or the bearing cap macroscopic or microscopic. This results after the assembly of the split radial bearing a form fit, which can absorb the horizontal forces. Examples of this are the German Offenlegungsschriften DE 100 01 780 A1 or DE 198 19 080 A1 or DE 198 19 081 A1 listed.

A disadvantage of the structuring with subsequent positive locking during assembly (compression of bearing cap and bearing block) is the very high production costs.

Another way to absorb the horizontal forces while optimizing the fit of bearing cap and bearing block is to split the split radial bearing. Examples of this are in the German Offenlegungsschrift DE 44 13 255 A1 and in the German Offenlegungsschrift DE 198 53 307 A1 described.

Again, the very high production cost of disadvantage.

It is therefore the object of the present invention to inexpensively produce a split radial bearing while at the same time achieving the highest mechanical precision.

This object is achieved procedurally by the features in the characterizing part of patent claim 1 and hardware by the features in claim 6. By the method according to the invention and the radial bearing shared according to the invention, the use of existing production facilities is possible. Furthermore, it is advantageously a minimally invasive optimization of existing screwing concepts (for example straight and oblique screwing). The residual risk of the micro-transverse (relative) movement between the bearing cap and bearing block is minimized directly on the screwing surface due to adhesive and gearing effects. This accounts for the form fit of the high-strength adhesive consuming tolerance requirements. The frictional connection (surface bonding) in conjunction with a positive connection formed by the adhesive (toothing of the adhesive in surface depressions made on both sides) thus advantageously replaces tolerance-consuming component pairings.

Advantageous developments of the invention are described in the subclaims.

The surface depression according to claim 2 is at least one rectilinear groove which extends substantially in the direction of the crankshaft axis, wherein the rectilinear groove can completely cover the bearing seat and / or the bearing cap and / or can be aligned transversely to the crankshaft axis and / or substantially circular, can be introduced concentrically to a screw in the interface. Also a punctual surface recess is possible.

Preferably, the surface depression is introduced according to claim 3 by scattering in the separation surface.

In addition, the adhesive is applied according to claim 4 at least in the region of the surface depression on the release surface.

In order to achieve the highest strength of the composite, at least the surface depression according to claim 5 should be completely filled with adhesive.

The best strength results for a split radial bearing were obtained according to claim 6 characterized in that the surface recess has a width between 0.1 mm and 1 mm and a depth between 0.1 mm and 1 mm.

Preferred cross sections of the surface depression are according to claim 7 triangular or rectangular or semicircular. With several introduced surface depressions may also be a combination of different cross sections of advantage.

In a preferred embodiment, in a split radial bearing according to the invention according to claim 8, the bearing cap of a Casting material and the bearing foot made of a light metal.

The invention is explained in more detail below with reference to six figures for four exemplary embodiments.

1 shows a plan view of a semi-transparent illustrated radial bearing portion according to the invention.

2 shows a plan view of a bearing block section according to the invention.

3a shows a plan view of a first embodiment of a bearing cap portion according to the invention.

3b shows a plan view of a second embodiment of a bearing cap portion according to the invention.

3c shows a plan view of a third embodiment of a bearing cap portion according to the invention.

3d shows a plan view of a fourth embodiment of a bearing cap portion according to the invention.

The following apply in the 1 to 3d for same components the same reference numbers.

1 shows a plan view of a portion of a illustrated radial bearing according to the invention 1 , consisting of a transparent bearing cap 2 of which only the outer edges are recognizable. A separating surface of the bearing cap 2 is with 2 ' quantified. A camp chair 3 with a dividing surface 3 ' is shown as a shaped body. The bearing cap 2 and the camp chair 3 have two bearing shells in an unnumbered bearing bore 7 on. The bearing cap 2 has two bolt holes on both sides of the bearing bore 8th on, in the bearing cap 2 are designed as through holes. The camp chair 3 has corresponding screw holes 8th on which are equipped with threads for attaching the bearing cap 2 on the camp chair 3 , When mounting the bearing cap 2 on the camp chair 3 become the dividing surfaces 2 ' . 3 ' braced together. With 6 is a radius marked, which is a transition of the bearing block 3 represents an unnumbered crankcase. In particular, this radius 6 tends to crack due to the above-mentioned Fraßkorrosion.

• – in zumindest einer Trennfläche 2', 3' eine Oberflächenvertiefung 5 eingebracht wird (sichtbar in den 2 bis 3d) und anschließend
• – ein Kleber auf zumindest eine Trennfläche 2', 3' aufgebracht wird und anschließend
• – der Lagerdeckel 2 und der Lagerstuhl 3 mittels der zumindest einen Schraube 4 gegeneinander verspannt werden.

To this eating corrosion cracking in the area 6 To prevent, according to the invention, a method for mounting the split radial bearing 1 proposed for a crankshaft of an internal combustion engine, which is characterized in that

• - In at least one interface 2 ' . 3 ' a surface depression 5 is introduced (visible in the 2 to 3d ) and subsequently
• - An adhesive on at least one interface 2 ' . 3 ' is applied and then
• - the bearing cap 2 and the camp chair 3 by means of the at least one screw 4 be braced against each other.

The surface depression 5 is at least one rectilinear groove largely in the direction of a crankshaft axis ( 2 . 3a . 3c ) and / or transverse to a crankshaft axis and / or substantially circular, concentric with the screw hole 4 into the interface 2 ' . 3 ' brought in. This shows 3c a special version in which the surface depressions 5 not pulled over the entire width of the bearing cap.

The surface depression is preferred 5 by scattering in the separating surface 2 ' . 3 ' brought in. Scattering is generally familiar to the person skilled in the art by the known thread spreader.

The adhesive is preferably at least in the region of the surface depression 5 on the interface 2 ' . 3 ' applied, again preferably the surface recess 5 is completely filled with adhesive to maximum shear and shear stresses caused by the micro-movements between the interfaces 2 ' . 3 ' to be able to record.

Particularly preferably, the surface depression 5 a width between 0.1 mm and 1 mm and a depth between 0.1 mm and 1 mm.

Preferred cross sections of the surface depression 5 are triangular or rectangular or semicircular cross-sections or multiple surface depressions 5 also mixed forms of it.

Particularly advantageous method of the invention, if the bearing cap 2 from a cast material, in particular gray cast iron and the bearing chair 3 made of a light metal, in particular hypereutectic aluminum.

2 shows a plan view of one half of a bearing block according to the invention 3 which is part of a crankcase. In the interface 3 ' are two surface depressions 5 introduced, in other embodiments, or only a single or a plurality of surface depressions 5 could be. In this embodiment, the surface depressions extend 5 over the whole width of the camp chair 3 ,

3a shows a plan view of a half for a first embodiment of a bearing cap according to the invention 2 , In the interface 2 ' of the bearing cap 2 again are two surface depressions 5 introduced, as in the embodiment in 2 extend over the entire width of the bearing cap. These surface depressions 5 can to the surface depressions 5 in the camp chair 3 correspond or be offset against it. Also the number of surface pits 5 in the bearing cap 2 and storage chair 3 can vary.

3b shows a plan view of a half for a second embodiment of a bearing cap according to the invention 2 in his dividing area 2 ' a coaxial to the screw hole 8th arranged surface depression 5 has, which is circular in the present embodiment. In a further embodiment, a plurality of coaxial surface depressions 5 be provided, even to the second screw hole 8th , It is also possible that the surface depressions around the screw holes 8th cross.

3c shows a plan view of a half for a third embodiment of a bearing cap according to the invention 2 in which in the interface 2 ' also like in the 2 and 3a two surface depressions 5 are introduced, but not over the entire width of the interface 2 ' of the bearing cap 2 extend.

3d shows a plan view of a half for a fourth embodiment of a bearing cap according to the invention 2 who is on his dividing surface 2 ' four around the screw hole 8th distributed surface depressions 5 having. In other embodiments, more or fewer surface depressions may also be used 5 be provided, which is also about the second screw hole 8th can extend.

The inventive method and the invention shared radial bearing for a crankshaft bearing of an internal combustion engine, the use of in-house existing manufacturing facilities is possible. Furthermore, it is advantageously a minimally invasive optimization of existing screwing concepts (for example straight and oblique screwing). The residual risk of micro-transverse (relative) movement between bearing cap 2 and storage chair 3 is directly on the bolting surface or the separating surfaces 2 ' . 3 ' minimized by adhesive and gearing effects. This accounts for the form fit of the high-strength adhesive consuming tolerance requirements. The frictional connection (surface bonding) in conjunction with a positive connection formed by the adhesive (toothing of the adhesive in surface depressions made on both sides) thus advantageously replaces tolerance-consuming component pairings.

As an adhesive, for example, known two-component adhesive can be used or, for example, the known, commercially available adhesive from Loctite with the trade name Loctite 603 or the company omniTECHNIK Mikroverkapselungs with the trade name Precote 85 ,

LIST OF REFERENCE NUMBERS

1

radial bearings

2

bearing cap

2 '

Separating surface bearing cap

3

bearing foot

3 '

Separating surface bearing foot

4

screw

5

surface depression

6

cracking

7

bearing shell

8th

screw hole

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007037461 A1 [0002]
• DE 10001780 A1 [0004]
• DE 19819080 A1 [0004]
• DE 19819081 A1 [0004]
• DE 4413255 A1 [0006]
• DE 19853307 A1 [0006]

Claims (8)

Method for mounting a split radial bearing ( 1 ) for a crankshaft of an internal combustion engine, consisting of a bearing cap ( 2 ) and a bearing foot ( 3 ), their interfaces ( 2 ' . 3 ' ) by means of at least one screw ( 4 ) are braced against each other, characterized in that • in at least one separation surface ( 2 ' . 3 ' ) a surface depression ( 5 ) is introduced and then • an adhesive on at least one release surface ( 2 ' . 3 ' ) and then • the bearing cap ( 2 ) and the bearing foot ( 3 ) by means of at least one screw ( 4 ) are braced against each other. Method according to claim 1, characterized in that • the surface depression ( 5 ) as at least one rectilinear groove largely in the direction of a crankshaft axis and / or transversely to a crankshaft axis and / or substantially circular, concentric with the screw hole ( 4 ) in the interface ( 2 ' . 3 ' ) is introduced. Method according to claim 1 or 2, characterized in that • the surface depression ( 5 ) by scattering in the separating surface ( 2 ' . 3 ' ) is introduced. Method according to one of the claims 1 to 3, characterized in that • the adhesive at least in the region of the surface recess ( 5 ) on the interface ( 2 ' . 3 ' ) is applied. Method according to one of the claims 1 to 4, characterized in that • at least the surface recess ( 5 ) is completely filled with glue. Divided radial bearing produced by a method according to one of the claims 1 to 5, characterized in that the surface depression ( 5 ) has a width between 0.1 mm and 1.0 mm and a depth between 0.1 mm and 1.0 mm. Divided radial bearing produced by a method according to one of the claims 1 to 5, characterized in that the surface depression ( 5 ) has a triangular or rectangular or semicircular cross-section. Split radial bearing produced by a method according to one of the claims 1 to 5, characterized in that the bearing cap ( 2 ) is made of a cast material and the bearing foot ( 3 ) is made of a light metal.

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