GB2296752A - Method of manufacturing a connecting rod - Google Patents
Method of manufacturing a connecting rod Download PDFInfo
- Publication number
- GB2296752A GB2296752A GB9600407A GB9600407A GB2296752A GB 2296752 A GB2296752 A GB 2296752A GB 9600407 A GB9600407 A GB 9600407A GB 9600407 A GB9600407 A GB 9600407A GB 2296752 A GB2296752 A GB 2296752A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rod
- connecting rod
- bearing part
- bearing
- shank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005336 cracking Methods 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910001018 Cast iron Inorganic materials 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 claims 1
- 239000010439 graphite Substances 0.000 claims 1
- 238000003825 pressing Methods 0.000 claims 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
- F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/04—Connecting-rod bearings; Attachments thereof
- F16C9/045—Connecting-rod bearings; Attachments thereof the bearing cap of the connecting rod being split by fracturing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
In a method of manufacturing a connecting rod from cast material a bearing cover 5, which is to be fastened to the bearing part 6 on the side of the connecting-rod shank 4 by means of screws inserted into through-bores 9, is made by splitting an originally integral rod. To avoid the deformation which can accompany such processes the separation between the bearing cover and the bearing part on the shank side is favoured by the local generation of concentrated regions of inherent stress in the region of the separating plane 8, for instance by driving in additional material 7 by hammering. A subsequent cracking procedure can thus be performed without additional deformation since the region of high stress will break preferentially. <IMAGE>
Description
Method for manufacturing a connecting rod
The present invention relates to a method for manufacturing a connecting rod, in particular from spheroidal graphite cast iron.
In the manufacture of connecting rods by means of casting technology the connecting rod is cast as a whole in one piece. The connecting rod consists of a large and a small bearing eye which are connected to each other by means of a connecting-rod shank. To process the connecting rod following casting so that it is ready for use, the large bearing eye perpendicular to the axis of the connecting-rod shank must be divided so that the upper part of the large bearing eye is separated as a so-called bearing cover. During assembly in the engine, to connect this upper bearing part with the lower bearing part on the side of the connecting-rod shank again, a screw connection is provided. Of course, to guarantee an optimal connection the contact surfaces in the separating plane between the upper and the lower bearing part must have complete surface contact.
This is achieved according to known methods on the one hand by costly processing or machining of the contact surfaces or by the so-called cracking method.
During cracking, with the aid of a predetermined breaking point and by introducing large tensile forces, the bearing cover is, so to speak, blasted away from the lower bearing part on the side of the connectingrod shank. The separated surfaces which thereby result have the original complete surface contact again when they are put together during assembly.
The problem with this described cracking procedure consists in that occasionally it can produce an elliptical shape; moreover this can vary substantially in dependence on the material.
The present invention is concerned with these problems and is intended to improve reproducibility with respect to the geometrical requirements.
According to the invention there is provided a method for manufacturing a connecting rod from casting material, of the kind in which a bearing cover is fastened to the bearing part on the side of the connecting-rod shank, for instance by means of screws inserted into through-bores, characterised in that the separation between the bearing cover and the bearing part on the side of the connecting-rod shank is assisted by the local generation of one or more regions of inherent tension in the region of the separating plane. This inherent tension can be produced by compression by applying a tool, for instance, and in particular by stamping in additional material.
A preferred embodiment will now be described in more detail in the following, with the aid of the attached Figures.
Figure 1 is a plan view of a connecting rod in accordance with the invention.
Figure 2 is a side view of the connecting rod according to Figure 1.
Figure 1 shows a connecting rod 1 with a large bearing eye 2 and a small bearing eye 3. The two bearing eyes are connected to each other by means of a shank 4. To make the connecting rod ready for use, various treatments must be performed. Thus, for example, the upper bearing cover 5 must be separated along the separating plane 8 from the bearing cover 6 on the side of the connecting-rod shank.
In accordance with the invention a region of intrinsic stress is created where parting is to take place. In this embodiment it is envisaged that in the region of the separating plane 8 additional material is formed, for instance by being poured or moulded. This can take place, for example, during the casting procedure so that the additional material 7 is integral with the connecting rod, but a separate piece can be used. The form of this additional material can vary, but it is advantageously in the forms of a boss or shoulder rising from the plane of the surface 10 of the connecting rod 4 as shown in Fig. 2, and reaching radially outwards at least as far as the axis 9 of the screws which in use hold the two bearing halves together, as shown in Fig. 1, so as to ensure satisfactory splitting.In the embodiment shown material is applied from both sides of the plane of the rod as well as on both diametral sides.
After the casting has taken place, the poured or cast material 7 is pressed or driven into the material mass of the connecting rod, for instance by hammering, so that the surface is flat, that is to say that the surface 10 of the large bearing part lies in a plane again.
During pressing-in of the poured material 7, which advantageously takes place by means of stamping, the material around the parting plane is compressed with the result that a local region of high inherent stress is formed.
The subsequent cracking procedure can thus be carried out without additional geometrical deformation since the region of high intrinsic tension will break preferentially.
In the embodiment shown the parting is indicated as a plane, though other configurations are in principle possible. The connecting rod may be of some conventional material, such as spheroidal graphite iron, and where additional material is used it can be of the same material as that of the connecting rod, even when not cast integrally.
Claims (8)
1. A method for manufacturing a connecting rod from casting material, of the kind in which a bearing cover is, in use, fastened to the bearing part on the side of the connecting-rod shank, for instance by means of screws inserted into through-bores, the bearing part and cover being initially in one piece, characterized in that the separation between the bearing cover and the bearing part on the side of the connecting-rod shank is favoured by the local generation of one or more regions of inherent stress in the region of the separating plane.
2. A method according to claim 1, in which the separation takes place by means of cracking.
3. A method according to claim 1 or 2, in which the inherent stress is generated by material deformation.
4. A method according to one of claims 1 to 3, in which during the casting, material is additionally applied to the area of inherent stress which is to be generated, and this material is then pressed into the connecting-rod material to generate the stress.
5. A method according to claim 4, in which the cast material consists of the same material as the connecting-rod material.
6. A method according to one of claims 1 to 5, in which cast iron with spheroidal graphite is used as the material for the connecting rod.
7. A method according to claim 1 or 2, in which the local areas of inherent stress are achieved by pressing in a tool.
8. A method substantially as described herein with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH4295 | 1995-01-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9600407D0 GB9600407D0 (en) | 1996-03-13 |
| GB2296752A true GB2296752A (en) | 1996-07-10 |
Family
ID=4178015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9600407A Withdrawn GB2296752A (en) | 1995-01-09 | 1996-01-09 | Method of manufacturing a connecting rod |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU4086596A (en) |
| BR (1) | BR9600078A (en) |
| DE (1) | DE19547338A1 (en) |
| GB (1) | GB2296752A (en) |
| HU (1) | HUT73725A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102626777A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of composite double-metal cracking connecting rod |
| CN102626770A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of splitting-type connecting rod |
| CN103009020A (en) * | 2012-12-31 | 2013-04-03 | 江苏大学 | Manufacturing method for steel cracking connecting rod |
| CN106994496A (en) * | 2017-04-14 | 2017-08-01 | 江苏大学 | A kind of forging method of steel bimetallic cracking connecting-rod |
| CN108080602A (en) * | 2017-12-21 | 2018-05-29 | 南京航空航天大学 | A kind of part blank nature cracking technology |
| CN108386451A (en) * | 2017-02-02 | 2018-08-10 | 米巴烧结奥地利有限公司 | Support cap |
| CN109014783A (en) * | 2018-08-15 | 2018-12-18 | 全椒县全动机械有限公司 | A kind of IC engine link rod manufacturing process |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102950419A (en) * | 2012-11-19 | 2013-03-06 | 无锡市京锡冶金液压机电有限公司 | Precise basis type production processing flow for engine connecting rod |
| CN113146154A (en) * | 2021-04-12 | 2021-07-23 | 徐州新大隆化工泵业制造有限公司 | Processing technology of connecting rod of high-pressure plunger pump |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0342800A2 (en) * | 1988-05-17 | 1989-11-23 | Ford Motor Company Limited | Making a fractured powder metal connecting rod |
| GB2276931A (en) * | 1993-04-05 | 1994-10-12 | Schulte Kg Hammerwerk | Forged steel connecting rod |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4311108C1 (en) * | 1993-04-05 | 1994-04-07 | Schulte Kg Hammerwerk | Connecting rod welded from steel - has break-off point in crank eye, to facilitate cracking |
-
1995
- 1995-12-19 DE DE1995147338 patent/DE19547338A1/en not_active Ceased
- 1995-12-29 HU HU9503945A patent/HUT73725A/en unknown
-
1996
- 1996-01-08 AU AU40865/96A patent/AU4086596A/en not_active Abandoned
- 1996-01-09 GB GB9600407A patent/GB2296752A/en not_active Withdrawn
- 1996-01-09 BR BR9600078A patent/BR9600078A/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0342800A2 (en) * | 1988-05-17 | 1989-11-23 | Ford Motor Company Limited | Making a fractured powder metal connecting rod |
| GB2276931A (en) * | 1993-04-05 | 1994-10-12 | Schulte Kg Hammerwerk | Forged steel connecting rod |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9695866B2 (en) | 2012-04-17 | 2017-07-04 | Jiangsu University | Method for manufacturing composite double-metal fracture splitting connecting rod |
| CN102626777A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of composite double-metal cracking connecting rod |
| WO2013155826A1 (en) * | 2012-04-17 | 2013-10-24 | 江苏大学 | Manufacturing method of composite double-metal cracking connecting rod |
| CN102626770B (en) * | 2012-04-17 | 2014-08-20 | 江苏大学 | Manufacturing method of splitting-type connecting rod |
| CN102626777B (en) * | 2012-04-17 | 2014-10-29 | 江苏大学 | Manufacturing method of composite double-metal cracking connecting rod |
| CN102626770A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of splitting-type connecting rod |
| CN103009020A (en) * | 2012-12-31 | 2013-04-03 | 江苏大学 | Manufacturing method for steel cracking connecting rod |
| AT519606A1 (en) * | 2017-02-02 | 2018-08-15 | Miba Sinter Austria Gmbh | bearing cap |
| CN108386451A (en) * | 2017-02-02 | 2018-08-10 | 米巴烧结奥地利有限公司 | Support cap |
| AT519606B1 (en) * | 2017-02-02 | 2018-11-15 | Miba Sinter Austria Gmbh | bearing cap |
| US10253816B2 (en) | 2017-02-02 | 2019-04-09 | Miba Sinter Austria Gmbh | Bearing cover |
| CN106994496A (en) * | 2017-04-14 | 2017-08-01 | 江苏大学 | A kind of forging method of steel bimetallic cracking connecting-rod |
| CN106994496B (en) * | 2017-04-14 | 2018-12-14 | 江苏大学 | A kind of forging method of steel bimetallic cracking connecting-rod |
| CN108080602A (en) * | 2017-12-21 | 2018-05-29 | 南京航空航天大学 | A kind of part blank nature cracking technology |
| CN109014783A (en) * | 2018-08-15 | 2018-12-18 | 全椒县全动机械有限公司 | A kind of IC engine link rod manufacturing process |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19547338A1 (en) | 1996-10-31 |
| AU4086596A (en) | 1996-07-18 |
| HUT73725A (en) | 1996-09-30 |
| BR9600078A (en) | 1998-01-27 |
| GB9600407D0 (en) | 1996-03-13 |
| HU9503945D0 (en) | 1996-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |