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Connecting rod for a combustion engine and method for coating the plain bearing surfaces thereof

A technology of sliding bearings and internal combustion engines, applied in the direction of connecting rod bearings, bearings, bearing components, etc., can solve the problems of inability to ensure accurate bearing clearance adjustment, irregular layer thickness reduction, etc., achieve long service life, improve lubrication characteristics, improve persistent effect

Active Publication Date: 2007-12-26
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has the disadvantage that the baking process for drying produces an uncontrollable and irregular reduction in layer thickness, whereby precise bearing clearance adjustment cannot be ensured (for example plain bearings, bearing shells or connecting rods of internal combustion engines)

Method used

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  • Connecting rod for a combustion engine and method for coating the plain bearing surfaces thereof
  • Connecting rod for a combustion engine and method for coating the plain bearing surfaces thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Coating in the small end hole of the connecting rod:

[0028] The connecting rod 1 is machined in a known manner. The small head hole 2 of the connecting rod is precisely opened with a surface roughness of Rz (average peak-to-valley height)<6.3 μm. At the same time, the diameter of the opening before coating is selected such that the piston pin obtains a diameter gap of 30-40 μm. The small head hole of the connecting rod can obtain a spherical shaped opening. Afterwards, the connecting rod is cleaned so as to completely remove debris, particles, machining oil (motor oil) and the like.

[0029] In preparation for coating, cover plates 21 are installed on both sides of the connecting rod head hole, which cover plates match the outer contour of the connecting rod small head hole. Cover plate 21 can prevent from being painted on the outside of connecting rod.

[0030] The lubricating varnish made of a matrix resin polyamideimide with good high temperature resistance con...

Embodiment 2

[0035] Coating in connecting rod pinholes with grease holes:

[0036] The connecting rod 1 is machined and cleaned substantially according to Example 1. Only the connecting rod head bore diameter was designed to have a radial piston pin clearance of 20-30 μm before coating.

[0037] In preparation for coating, cover plates 21 are installed on both sides of the connecting rod head hole, which cover plates match the outer contour of the connecting rod small head hole. The cover plate 21 prevents the outside of the connecting rod from being painted.

[0038] The lubricating varnish made of a base resin polyamideimide with good high temperature resistance contains graphite as solid lubricant material, the graphite having a particle size of 1-3 μm. The viscosity of the lubricating varnish is adjusted in such a way that drops do not form, but sufficient spreadability is possible.

[0039] Lubricating paint cannot be added in the lubricating oil hole 7 that is centrally arranged i...

Embodiment 3

[0044] Coating in the pinholes of phosphated connecting rods:

[0045] The connecting rod 1 is machined and cleaned substantially according to Example 1. The diameter of the connecting rod bore is selected before coating in such a way that the piston pin obtains a radial play of 30-40 μm.

[0046] Afterwards, the upper half of the connecting rod 1 is phosphating. A commercial phosphating solution, that is, Gardobond G 4098 from Fa. Chemetall in Frankfurt, can be used as the phosphating treatment solution. The phosphating process produces an approximately 5 μm thick layer consisting of iron-manganese-phosphate. On the one hand, this layer serves as an adhesion basis for the paintwork, and on the other hand, it has very good lubricating and separating properties and, in conjunction with the lubricating varnish coating, together prevents the piston pin from jamming in the small end hole of the connecting rod .

[0047] For phosphating the upper half of the connecting rod, the...

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Abstract

Disclosed is a connecting rod for a combustion engine, comprising a small connecting-rod eye that is provided with a plain bearing surface and is used for accommodating a piston pin, and a large connecting-rod eye which is provided with a plain bearing surface and embraces a crankshaft journal. In order to very effectively and inexpensively prevent the piston pin and the crankshaft journal of said connecting rod from jamming and wearing off, a self-lubricating coating made of a thermally cured resin which contains embedded solid lubricant particles is applied directly to at least one of the plain bearing surfaces by means of rotary atomization.

Description

technical field [0001] The invention relates to a connecting rod for an internal combustion engine, the connecting rod has: a connecting rod small head hole with a sliding bearing surface for receiving a piston pin; Rod bore, which encloses the connecting rod journal, and the invention also relates to a method for coating sliding bearing surfaces. Background technique [0002] Connecting rods with directly coated connecting rod bores are known in the prior art, for example in DE 19731 625 and EP 0 863 322 B1. Therein it is disclosed that the assembly of the connecting rod bearing is simplified by eliminating the connecting rod bearing shell. For this purpose, a bearing layer made of metal, in particular aluminum bronze, is applied by plasma spraying directly to the pin bore of the connecting rod, which bearing layer provides sufficient lubrication for the bearing points. However, in order to maintain the dimensional accuracy for the assembly of the connecting rods and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/08B05D7/22C09D179/08F16C9/04F16C33/20
CPCB05D5/083F16C9/04F16C33/201C08L27/18C08K3/04C08K3/30F16J7/00F16C2360/22C08L79/08Y10T74/2142B05D3/0254B05D3/0218F16C33/208B05D7/22B05D5/08B05D2202/00C23C22/18F16C2208/42F16C2240/60C08L2666/04
Inventor 库尔特·迈尔
Owner MAHLE INT GMBH
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