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Manufacture of clutch components

a technology of clutch components and components, applied in the direction of transportation and packaging, metal-working apparatus, etc., can solve the problems of material's propensity to crack propagation in the finished component, and achieve the effects of low hardenability, aggressive cooling or quenching operation, and strong martensitic wear resistance hard structur

Inactive Publication Date: 2008-04-24
BURGESS NORTON MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a method for manufacturing automotive components using a low alloy constituent, low hardenability material that requires a more aggressive cooling or quenching operation to produce a strong martensitic wear resistant hard structure. The method includes the traditional powder metallurgy operation of die compacting and sintering that is followed by a quenching operation wherein the sintered material is quenched in an environment of a cooling rate that results in a metallic microstructure that is 50-80% martensitic, 20-50% bainitic with a small portion of fine pearlite, generally less than 10%. The resulting micro structure from reduction in hardenability reduces the material's propensity to crack propagation in the finished component. The service life of the automotive transmission or clutch bracket component such as a backing plate is greatly extended. The method also reduces the material's propensity to crack propagation in the finished component."

Problems solved by technology

Further, the resulting micro structure from reduction in hardenability reduces the material's propensity to crack propagation in the finished component.

Method used

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  • Manufacture of clutch components
  • Manufacture of clutch components
  • Manufacture of clutch components

Examples

Experimental program
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example 1

[0023]In a method of manufacturing an automotive clutch component, an initial pre alloy metal powder of particle sizes between 250 and 1 micron was provided comprising, by weight, 0.45% nickel, 0.65% molybdenum, with the balance essentially iron.

[0024]An additional 0.7% graphite, and 1.75% copper metal powder of particle sizes between 150 and 1 micron, by weight, were admixed to form an admixed metal powder.

[0025]0.5% EBS was added as a lubricant to form a lubricated admixed metal powder.

[0026]The lubricated, admixed metal powder was compacted at a pressure of 45 tons per square inch.

[0027]The die compacted metal blank was then sintered at a temperature 2050° F. for 15 minutes.

[0028]The sintered metal blank was then quenched at a rate of 5.4° F. (3.00° C.) per second from an initial temperature of (2000° F.) (1090° C.) to a temperature of (500° F.) (260° C.) per use. The quenched metal blank was then tempered at a temperature of (380° F.) (190° C.) for 60 minutes.

[0029]The resulting...

example 2

[0030]In a method of manufacturing an automotive clutch component, an initial pre alloy metal powder of particle sizes between 250 and 1 microns was provided comprising, by weight, 0.45% nickel, 0.65% molybdenum, with the balance essentially iron.

[0031]An additional 0.9% graphite, and 1.75% copper metal powder of particle size between 150 and 1 micron, by weight, were admixed to form an admixed metal powder.

[0032]0.5% EBS was added as a lubricant to form a lubricated admixed metal powder.

[0033]The lubricated, admixed metal powder was compacted at a pressure of 45 tons per square inch.

[0034]The die compacted metal blank was then sintered at a temperature 2050° F. for 15 minutes.

[0035]The sintered metal blank was then quenched at a rate of 1.9° F. (1.05° C.) per second from an initial temperature of (2000° F.) (1090° C.) to a temperature of (500° F.) (260° C.) per use. The quenched metal blank was then tempered at a temperature of (380° F.) (1090° C.) for 60 minutes.

[0036]The resultin...

example 3

[0037]In a method of manufacturing an automotive clutch component, an initial pre alloy metal powder of particle size between 250 and 1 micron was provided comprising, by weight, 0.45% nickel, 0.65% molybdenum, with the balance essentially iron.

[0038]An additional 0.9% carbon, and 1.75% copper metal powder of particle size between 150 and 1 micron, by weight, were admixed to form an admixed metal powder.

[0039]5% EBS was added as a lubricant to form a lubricated admixed metal powder.

[0040]The lubricated, admixed metal powder was compacted at a pressure of 45 tons per square inch.

[0041]The die compacted metal blank was then sintered at a temperature 2050 for 15 minutes.

[0042]The sintered metal blank was then quenched at a rate of 1.9° F. (1.0° C.) per second from an initial temperature of (2000° F.) (1090° C.) to a temperature of (500° F.) (260° C.) per use. The quenched metal blank was then tempered at a temperature of (380° F.) (190° C.) for 60 minutes.

[0043]The resulting material h...

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Abstract

Clutch components for automotive use usually include a pair of clutch members with operative faces. In particular, planar one way clutches include a pair of clutch members whose operative faces are enclosed spaced opposition, with each clutch face including a plurality of recessed defining respective load bearing shoulders. A plurality of struts are disposed between the coupling face of the members, and such struts are moveable between the coupling position and non coupling position. A preferable method of manufacturing such clutch components includes powder metal operations comprising die compacting a metal powder into a metal blank, sintering the metal blank to form a sintered metal blank, and cooling the sintered metal blank to form a cooled metal blank. The preferred metallic structure of the cooled metal blank is 50-80% martensite and 20-50% bainite and fine pearlite. The application is especially useful for clutches used as backing plates in clutch brake applications.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to automotive clutch or transmission components and, more particularly, to so called one way clutches wherein one or more struts provide a mechanical coupling between opposed clutch faces and a pair of coaxially rotateable members.[0002]As explained in U.S. Pat. No. 6,571,926, in such one way clutches, a driving member engages a driven member.[0003]A thin flat strut is carried within each of the driving members' pockets such that a first longitudinal end may readily engage and bear against the shoulder defined by the corresponding recess in the driving member. The struts second, opposite longitudinal end is urged by spring force toward and against the driven member, thereby contacting a complimentary surface on the driven member.[0004]The materials and processing of such clutch components use high hardenability metals to produce the clutch components. Such materials can be used as backing plates in automotive transmissio...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F3/12
CPCB22F5/08B22F5/106B22F2998/10B22F2999/00C22C38/16C22C33/0264C22C38/08C22C38/12C22C33/0207B22F1/0059B22F3/02B22F3/10B22F2203/13B22F2203/11B22F1/10B22F3/12
Inventor ENGQUIST, JOHN R.HAAS, MARK R.
Owner BURGESS NORTON MFG
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