JP2001116035A - Connecting rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively mass-produce connecting rods being composed of two thin plate half parts and having bar divisions having connecting eyes supported by an mechanical element on respective end surfaces. SOLUTION: Thin plate half parts 1, 2 are manufactured by deep drawing, and are mutually fixedly joined via outer races 13, 14 of rolling bearings 9, 10 press-fitted to respective connecting eyes 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a connecting rod made from two sheet halves, comprising a rod section having one connecting eye on each end side for supporting a machine element, It is of the type in which the separating surface between the sheet halves extends along the longitudinal central plane of the connecting rod and transversely to the connecting eye.

[0002]

2. Description of the Related Art A connecting rod of the above type is disclosed in DE 300 62 040.
It is disclosed in the specification of A1. This connecting rod is likewise 2
It consists of two sheet halves, which are made by stamping. The stamped sheet halves are bent so that the corresponding halves of the connecting eye are aligned with one another. The final fixing of the sheet halves is achieved by welding or by screwing or riveting. The special fixing of the two lamellas and the positioning of the lamellas with respect to each other increases the production effort and costs in an inconvenient manner. Furthermore, the document does not disclose any measures for lubricating the bearing points formed by the connecting eyes by simple means. Proposed are longitudinal passages along the rod section of the connecting rod, which are relatively expensive to manufacture.

[0003] DE 38 01 802 C2 discloses a connecting rod which likewise consists of a thin-plate forming part. This connecting rod consists of one component with an asymmetric structure. A bush constituting a sliding bearing which receives a dynamic load is press-fitted to the connecting eye. This connecting rod has a relatively low load-carrying capacity due to its structural shape. At the same time, the construction as an asymmetrical sheet metal part is relatively expensive.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connecting rod of the type described in which the above disadvantages are eliminated by simple means. In particular, it is intended for connecting rods which can be manufactured with little production effort and therefore with little production cost.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method in which the halves of the sheet metal are manufactured by deep drawing and are fixedly connected to each other via an outer race of a rolling bearing pressed into each connecting eye. Was solved by being.

The present invention proposes a connecting rod having excellent strength and which can be manufactured easily. Since the two sheet halves of the connecting rod are simultaneously secured to one another via the press-fit rolling bearings, the additional securing measures found in the prior art are eliminated. The pivoting of the connecting rod via its connecting eye, for example on the crankpin of a crankshaft of an internal combustion engine or the piston pin of a piston, requires very little friction via the needle, pin or ball bearing proposed in the present invention. Done in

The connecting rod works on a two-cycle principle and can be used in an internal combustion engine in which mixed lubrication is used as a lubrication method. Such tow cycle engines have various shapes in practice, such as motor saws, lawnmowers,
Used for stationary small motors. However, the connecting rod proposed by the present invention is not limited to the internal combustion engine type described above. It is very easy for a person skilled in the art to consider many other possible applications.

Further, by using the needle bearing, the oil component in the fuel-oil mixture (oil fog in the crankcase) can be reduced in the two-cycle internal combustion engine. This has an advantage with regard to the emission of harmful components.

Further, according to the configuration of the present invention, it is proposed that the rolling element of the rolling bearing or the needle of the needle ring is disposed so as to be axially accommodated inside the connecting eye. This arrangement ensures a long bearing life and good support of the forces generated in the crank mechanism. Advantageously in this connection, the rolling elements of the rolling bearing extend over substantially the entire axial length of the connecting eye. As a result, the end face of the outer race projects beyond the connecting eye in the axial direction.

It is particularly advantageous in terms of manufacturing technology that the sheet metal halves of the connecting rod are manufactured mirror-like or almost mirror-image with each other. This reduces tool costs.

Furthermore, it has been proposed according to the invention to produce a projecting part on the half of the sheet which is likewise deep drawn and integrated with the half of the sheet in order to form a connecting eye. In this case, according to the embodiment of the present invention, only the end faces of the protruding molded portions can be brought into contact with each other to form the entire connecting rod.

[0012]

FIG. 1 shows a connecting rod 3 made from two sheet metal halves 1, 2 (see also FIG. 2). The connecting rod 3 has a central rod section 4, which has one connecting eye 7, 8 in the region of its end faces 5, 6, respectively. The upper connecting eye 7 can be provided, for example, for supporting a piston pin, not shown. The lower connecting eye 8 can be mounted on a crankpin.

The sheet halves 1, 2 are produced by deep drawing and have a substantially mirror-image geometry. Both sheet halves 1,
The connection of the two to each other is performed by rolling bearings 9, 10 which are press-fitted to connecting eyes 7, 8, respectively.
The rolling bearings 9 and 10 are used here for the needle sleeve 1.
1 and 12. The needle sleeves 11, 12 are press-fit on the corresponding connecting eyes 7, 8 on the outer races 13, 14. Each needle sleeve 1
The needles 12 have a single needle ring 15, 16 whose needles roll directly on the rolling surface, for example on a rolling surface on the piston pin or crankpin.

In order to lubricate the rolling bearings 9, 10, each connecting eye 7, 8 has at least one lateral hole 16a, 17. Lubricants are supplied to the lateral holes 16a, 17 by oil mist formed in the crankcase of the internal combustion engine during operation. At the same time, as can be seen particularly well in FIG. 3, each connecting eye 7, 8 has a ring step 18, 19 in a section of its edge region. The ring steps 18, 19 form one ring groove 20, 21, respectively, with the two sheet halves 1, 2 assembled. These ring grooves 20, 21
Is configured to extend annularly at each of the connecting eyes 7 and 8. At the same time, the outer races 13 and 14 respectively have at least one through hole 2 facing the rolling elements of the rolling bearings 9 and 10 respectively.
3, 24. As a result, the rolling bearings 9, 1
A simple and reliable lubrication of 0 is guaranteed.

[0015] Similarly, as can be seen from FIG.
Is a protruding molded part 2 integrally connected to each of the thin plate halves 1 and 2
5 and 26. The protruding parts 25, 2
Only at the end faces 27, 28 of the six are the two sheet metal halves 1, 2 in contact with each other. In the region of the rod section 4, the sheet metal halves 1 and 2 are formed in a concave shape.

Overall, the connecting rod 3 according to the invention can be manufactured simply and at low cost and is therefore suitable for mass production. Since the two sheet halves 1, 2 are connected to one another by the outer races 13, 14 of the rolling bearings 9, 10, no additional connection is required.

[Brief description of the drawings]

FIG. 1 is a side view of a connecting rod according to the present invention.

FIG. 2 is a longitudinal sectional view of a connecting rod rotated by 90 ° with respect to a separation surface.

FIG. 3 is a longitudinal sectional view of a thin plate half.

FIG. 4 is a detailed view showing an upper connecting eye together with a rolling bearing.

[Explanation of symbols]

1, 2 half-plate, 3 connecting rod, 4 rod section,
5,6 end face, 7,8 connecting eye, 9,10 rolling bearing, 11,12 needle sleeve 13,14 outer race, 15,16 needle ring, 16a, 17
Lateral hole, 18, 19 ring step, 20, 21 ring groove, 23, 24 through hole, 25, 26 projecting molded part, 27, 28 end face

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[Procedure amendment]

[Submission date] October 30, 2000 (2000.10.
30)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

Continued on the front page (72) Inventor Carl M. Natush United States of America North Carolina de Ividson Wildcat Trail 19322 (72) Inventor Bernd Abel United States of America South Carolina Chelow Ridge Road 13

Claims (9)

[Claims] 1. A connecting rod (3) made from two sheet metal halves (1, 2), one connecting eye (7, 8) for supporting a machine element on each end side (5). , 6) having a rod section (4), wherein the sheet halves (1, 1) are provided.
2. The type in which the separating surface between 2) extends along the longitudinal mid-plane of the connecting rod (3) and transversely to said connecting eyes (7, 8). 2) is manufactured by deep drawing, and the outer race (1) of the rolling bearing (9, 10) is press-fitted into each connecting eye (7, 8).
A connecting rod fixedly connected to each other via (3, 14). 2. The rolling bearing (9, 10) is configured as a needle sleeve and said rolling bearing (7, 10).
Outer race (13, 14) of needle ring (11, 12)
Extending along the corresponding articulating eyes (7, 8) together with
A connecting rod according to claim 1. 3. The rolling element of claim 1, wherein the rolling elements or the needles of the needle rings extend axially inside the connecting eyes.
Connecting rod described. 4. At least one outer race (13,1)
4. The connecting rod according to claim 3, wherein 4) has at least one end face (5, 6) projecting axially from a connecting eye (7, 8) surrounding the outer race (13, 14). 5. The connecting rod according to claim 1, wherein the lamella halves (1) are at least substantially mirror-imaged to one another. 6. An articulating eye (7, 8) is provided for each of the sheet metal halves (1, 1).
2) are integrally formed with the protruding moldings (25, 26), in which case the protruding moldings (25, 2) are formed.
2. The connecting rod as claimed in claim 1, wherein the end faces of (6) are in contact with one another. 7. The sheet metal halves (1, 2) are brought into contact with one another only in the region of the end faces (27, 28) of the projections (25, 26) and in the region of the bar section (4). 7. The connecting rod according to claim 6, wherein the connecting rod is configured in a con-curve. 8. In each connecting eye (7, 8), a ring-shaped step (18, 1) forming a ring groove (20, 21) in an assembled state in an edge region toward a separation surface.
The connecting rod according to claim 1, wherein 9) is formed. 9. The ring groove (20, 21) is cut out by at least one lateral hole (16a, 17), in which case the outer races (13, 14) of the rolling bearings (9, 10) at the same time. 9.) The connecting rod according to claim 8, wherein the connecting rod has a through hole (23, 24) communicating with the ring groove (20, 21).