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Highly friction resistant and durable bearing coatings for crankshafts and large end bearings

Inactive Publication Date: 2006-03-23
DAIMLER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] It is thus the task of the invention to provide a bearing coating or slide layer, which exhibits an elevated long time enduran

Problems solved by technology

The available bearings for the drive assemblies, in particular the bearings for the crankshafts, connecting-rod bearings large end bearings, are no longer capable of meeting the high mechanical and thermal strains resulting therefrom.
The known slide bearings and their

Method used

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Examples

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Effect test

Example

[0016] The separate bearing layer is comprised of an alloy, with a microstructure of several metal phases, wherein one phase represents a metal matrix and a further phase represents a metallic phase distributed or dispersed therein. The disperse metal phase exhibits only a low solubility in the metal of the metal matrix.

[0017] In a preferred embodiment of the invention the metal matrix is formed by an Al alloy and the disperse phase by Bi or a high melting Bi alloy.

[0018] By this combination of materials it is achieved, that on the basis of the low solubility of the Bi in the Al on the one hand a very finely distributed disperse phase is formed and on the other hand the thermal stability of the disperse phase, and therewith the total bearing layer, is significantly elevated by the comparatively high melting point of Bi or, as the case may be, its alloy, in comparison to known comparable bearing layers. Due to the insulation by unmixed interstices in the Al / Bi system the tendency o...

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Abstract

Slide layer for slide bearing, in particular for crankshafts, connecting-rod bearings or large end bearings, comprised of an alloy with several phases, which form a matrix and a dispersed phase, wherein the dispersed phase exhibits only a low solubility in the metal of the matrix, wherein the metal matrix is formed by a Al alloy and the dispersed phase by a Bi or a high melting Bi alloy, as well as slide bearings coated therewith and processes for producing a slide layer by sputter processes.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention concerns highly friction resistant and durable bearing coatings for crankshafts, connecting-rod bearings and large end bearings, slide bearings, as well as a suitable manufacturing process. [0003] 2. Related Art of the Invention [0004] The conventional processes for production of the bearings of this generic type involves coating a base material (for example steel or light metal) with a bearing or coating, or to clad the base material with a bearing shell. [0005] With the development of new generations of automobile motors, the requirements placed on the materials used in the drive assemblies steadily increase. For high power motors in commercial vehicles or passenger vehicles, in the future peak pressures of up to and beyond 250 bar are to be realized in the combustion cylinders in order to improve efficiency, power and exhaust gas quality. [0006] The available bearings for the drive assemblies, in pa...

Claims

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Application Information

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IPC IPC(8): B22F5/00F16C9/02F16C9/04F16C33/12
CPCF16C9/02Y10T428/12014F16C33/12F16C9/04F16C2204/20
Inventor KRAEMER, JOHANNSCHMIDT, ERWIN
Owner DAIMLER AG
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