JPS6327572B2 - - Google Patents

Abstract

A connecting rod bearing is disclosed for the crankshaft journals or piston pins of combustion engines. The bearing consists of a bush held in the connecting rod end and the invention is characterized in that the bush is in one piece and has side flanges which run radially outwards and accommodate the rod end between them.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a connecting rod bearing for a cylinder pin and/or piston pin of an articulating rod bearing of an internal combustion engine, which has a radially outwardly directed flange at its end face. a connecting rod bearing for a cylindrical pin and/or piston rod of a connecting rod bearing of an internal combustion engine, with an integrally formed bearing bush having a cylindrical inner surface and a cylindrical inner surface oriented radially outwardly at the end face. an integrally formed bearing bushing having a hardened flange and a cylindrical inner surface, the cylindrical inner surface of the bearing bushing being hardened and forming a hardened running surface for the rollers of the roller bearing; The method relates to a method of manufacturing a connecting rod bearing in which one flange is not hardened, the bearing bushing being press-fitted into the receiving opening of the connecting rod bearing, and the end of the bearing bushing being deformed.

PRIOR ART Connecting rod bearings formed from bearing metals are known (German Patent Specification No. 971 746), which connecting rod bearings can be divided into radial or axial sections depending on installation reasons. and has a flange on the terminal side. This kind of bearing arrangement is particularly disadvantageous in the case of roller-bearing connecting rods, i.e. the rollers roll over the split seam between the bearing faces of the bearing ring and induce shocks, thereby causing vibrations. This is because it occurs. Unlike this, a bearing ring with a flange on the terminal side and divided into axial lines requires an additional member to ensure prevention of movement, since it is impossible to prevent the axial movement by shape restraint. .

Furthermore, cylindrical bushes are known, for example as connecting rod bearings for pistons (DE 960,514), but these connecting rod bearings must additionally be protected against axial movement. Additionally, this structure lacks joint surfaces and guide surfaces at both ends.

Roller bearings for this purpose of connecting rods are also known, but in this case the ends of the thin-walled rings are deformed inwardly, which significantly impairs the lubricating hydraulic supply to the rollers. Even in this structure, prevention of axis movement is not guaranteed.

Furthermore, hardened connecting rods made of steel, for example, are known in order to obtain hardened bearing surfaces for needle bearings. Connecting rods treated in this manner require additional steps due to the hardening process of the entire connecting rod and are therefore more expensive to manufacture. Furthermore, such connecting rods made of steel are relatively heavy compared to connecting rods made of light metal and in the latter case require additional structural parts for the production of the joint surfaces and guide surfaces.

OBJECT OF THE INVENTION The object of the invention is to provide a connecting rod which can be produced with low manufacturing costs and which can be secured in a simple manner in the connecting rod head and/or in the connecting rod foot in an anti-twisting and anti-slip manner. The goal is to create bearings. Another object of the invention is a method for creating a connecting rod bearing that is relatively easy and cheap to produce.

(Means for Solving the Problem) The problem to be solved by the present invention is as set forth in claims 1 and 4.
This problem is solved by the configuration described in the feature section of the section.

Effects of the Invention The connecting rod bearing according to the invention provides a functionally reliable and inexpensive bearing in connecting rods made of unhardened workpiece material, such as light metal, for example. In particular, light metals allow a significant reduction in weight, vibration and costs, which is significantly facilitated by the bearing bushing according to the invention.

(Example) The present invention will be explained in detail based on the drawings.

The connecting rod 1 includes a connecting rod shank 2 having a foot (not shown) and a head 3.

Bearings are provided in the head 3 for a piston pin and/or a cylinder pin (not shown), which pins are mounted, for example, on the needle holder 4. This bearing in the head 3 includes a one-piece cylindrical bearing bush 5 with end flanges 6 and 7. The bearing bush 5 forms an outer ring with a bearing surface 8 for the needle 14 of the needle holder 4. The design of the connecting rod bearing is not limited solely to the use of a piston pin mounted on a needle retainer, but is also applicable to other types of bearings. Bearing bushings of this type can likewise be applied in the foot of the connecting rod.

The integral outer ring is formed from a drawn cylindrical hardenable bearing bushing 5. Flanges 6 and 7 at both ends of the bearing bush 5 extend radially outwards and contain the head 3 in a form-locking manner between them.

This configuration of the bearing bush 5 and its fixing to the head 3 prevent axial movement.
In order to prevent the bearing bush 5 in the head 3 from twisting, the head has a chamfer 10. This chamfered part 1
0 into which the deformed area 11 of the edge of the flange 6 or 7 of the bearing bush 5 is inserted.

For the manufacture of the above-mentioned connecting rod bearings, the cylindrical bearing bushing 5 is provided with a flange 6, as indicated by dash-dotted lines according to FIG. It is shaped by the working process.

The bearing bush 5 is then heat treated, ie the central cylindrical region 13, which forms the bearing surface 8 and on which the needle 14 rolls, is hardened. At least one end of the bearing bush 5, ie the end 12 of the flange, is not yet hardened and remains soft. Such partial hardening is produced, for example, by induction hardening or by case hardening in the case.

In the next working step, the constructed bearing bush 5 is then pressed into the hole in the head 3 so that the flange 6 joins to the end face 9 or 9a of the head 3. Next, the protruding terminal 1 of the bearing bush 5
2 is transformed into a flange 7. Of course, first of all, the flange 6 can also be modified. After this working step, the bearing bush 5 occupies an immovable position in the bore of the head 3. The flanges 6 and 7 form axial joint surfaces and guide surfaces for the end faces 9 and 9a of the head 3 due to the configuration described above.

According to another embodiment, the bearing bush 5 can be held rotationally secured in the bore of the head 3;
For this purpose, a partial region of the flange edge is pressed into the chamfer 10 of the end face 9.

According to an advantageous embodiment of the invention, the connecting rod is made of a light metal alloy and the bearing bush is made of a hardenable material. However, it is also conceivable to manufacture the connecting rod from other non-hardenable materials.

[Brief explanation of the drawing]

The drawing is a sectional view of the head of the connecting rod with the bearing of the piston pin and/or cylinder pin. Symbols in the figure, 3... Connecting rod bearing, 5... Bearing bush, 6, 7... Flange, 9... End face, 10...
...Misaligned part, 11... Range to be deformed.

Claims (1)

Claims: 1. A connecting rod bearing for a cylinder pin and/or piston pin of an articulating rod bearing of an internal combustion engine, comprising an integrally formed bearing bush having a radially outwardly directed flange at the end face; In a connecting rod bearing with a cylindrical inner surface, the cylindrical inner surface 13 of the bearing bushing 5 is hardened and forms a hardened running surface for the rollers 14 of the roller bearing, and the at least one flange 6, 7 is a connecting rod bearing characterized in that it is not hardened. 2 The bearing bush 5 has an additional shape-restricting connection 1
2. The connecting rod bearing according to claim 1, wherein the connecting rod bearing is held in a rotationally prevented manner. 3. The form-restricting connection is a chamfered part 10 offset from the end face 9 of the connecting rod head 3, and the deformed area of the edge of the flange 7 engages in the chamfered part. The connecting rod bearing according to item 2. 4. Connecting rod bearings for cylinder pins and/or piston pins of articulating rod bearings of internal combustion engines, comprising an integrally formed bearing bushing with a radially outwardly directed flange at its end face and a cylindrical inner surface. , the cylindrical inner surface 13 of the bearing bush 5 is hardened and forms a hardened running surface for the rollers 14 of the roller bearing, and the at least one flange 6, 7 is not hardened. In said method, the bearing bushing is inserted into the receiving opening of the connecting rod bearing and the end of the bearing bushing is deformed, the cylindrical inner surface 13 of the bearing bushing 5 being pressed into the connecting rod bearing in the end area. connecting rod bearing, characterized in that, after pressing the partially hardened bearing bushing 5 into the connecting rod bearing, at least one unhardened end region is bent into a flange 6, 7. manufacturing method. 5 The other unhardened end area is the bearing bush 5
5. The method according to claim 4, wherein the cylindrical inner surface 13 of the cylindrical inner surface 13 is transformed into flanges 6, 7 before hardening. 6. The method according to claim 4, wherein the other unhardened end regions are transformed into flanges 6, 7 after the partially hardened bearing bushing 5 is pressed into the connecting rod bearing.