WO1993016207A1 - Sinterreibwerkstoff fur reibschlüssige elemente, sowie verfahren zum herstellen derselben - Google Patents
Sinterreibwerkstoff fur reibschlüssige elemente, sowie verfahren zum herstellen derselben Download PDFInfo
- Publication number
- WO1993016207A1 WO1993016207A1 PCT/EP1993/000216 EP9300216W WO9316207A1 WO 1993016207 A1 WO1993016207 A1 WO 1993016207A1 EP 9300216 W EP9300216 W EP 9300216W WO 9316207 A1 WO9316207 A1 WO 9316207A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sintered
- material according
- friction material
- graphite
- friction
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
Definitions
- the invention relates to a sintered friction material in powder form with an iron matrix and a proportion of graphite for the production of frictional elements, in particular of synchronization bodies.
- Such sintered friction materials are used for frictional elements, which are part of clutches, brakes or synchronization devices, for example.
- a main area of application is synchro rings, from which high load limits are required.
- a friction element for oil running is known from DD-PS 89 727, which is intended for single-disc and multi-plate clutches, brakes or synchronous rings.
- This known friction element is manufactured using powder metallurgy. It receives iron powder metallic additives of nickel, copper and lead as well as graphite, each in powder form. The use of lead results in a considerable health hazard both in the manufacture and in the use of the friction element.
- the friction element made from this material tends to show strong adhesion, which manifests itself in a non-uniform torque build-up and seizures.
- DE-GM 73 42 680 describes a synchronizer ring made of sintered steel, on which a thin molybdenum layer is applied in the area of the friction surface.
- Molybdenum spray material is an expensive material. As a rule, it must be brought to the required surface dimensions on the synchronizing ring by grinding.
- the applied layer has a relatively large surface roughness, so that the effective friction surface is comparatively small. In particular, this can lead to strong heating in the friction surface, which can result in the synchronizer ring and synchronizer body seizing and the molybdenum layer becoming detached.
- the object of the invention is to create a sintered friction material which can withstand high loads with a sufficient coefficient of friction, in particular with regard to surface pressure and friction speed.
- This sintered material is said to be able to be used inexpensively in the manufacture of frictionally locking elements, in particular of synchronizing bodies, such as synchronizing rings.
- the recyclability of the sintered friction material and the frictional elements produced using it should be improved.
- the powdery material contains a proportion of graphite from 15 to 30 percent by volume and an alloy content of 0.3 to 6 percent by mass of phosphorus, boron and / or sulfur.
- the friction and wear behavior of the material is optimized by the proportion of graphite of at least 15 percent by volume.
- the alloy proportions especially if they are not only dissolved in iron, but also as phosphides, borides or sulfides of iron, greatly reduce the tendency of the iron matrix to weld or eat. By not using lead, the health hazard in the manufacture of the known material is eliminated.
- a relatively coarse-grained graphite powder or a graphite powder mixture with a large particle size distribution range is preferably used.
- the graphite is natural graphite, with which the desired grain size spectrum is achieved. This takes place above all if, in a further embodiment of the invention, the average grain size of natural graphite is 20 to 120 ⁇ m.
- the sintered friction material according to the invention can be designed in such a way that it contains a proportion of 5 to 15 volume percent of non-metallic substances which are constituted from metal oxides, metal carbides and / or alkaline earth metal sulfates. It has proven to be advantageous if these substances are used not as a chemical, but preferably as a natural substance in the form of mineral flour.
- the invention also relates to a method for producing a friction lining from a sintered friction material described above.
- the powdery starting components are mixed intimately, pressed at a pressure of 300 to 800 MPa and sintered at a temperature of 950 to 1150 ° C. in a protective gas atmosphere.
- the atmosphere can be inert or reduced.
- the invention relates to a frictional element, in particular a synchronizer ring, with a friction lining made of the sintered friction material described above.
- the carrier for the friction lining consists of sintered steel.
- the joining problem according to the invention can be solved either by pressing and sintering the friction lining and carrier material together or by sintering the friction lining material onto a steel beam.
- the friction lining is a component of the gradient structure of a sintered steel synchronizer ring. It must be emphasized that this type of joining is particularly cost-effective.
- the friction material has the level of friction required for use in synchronizers.
- the axial wear is less than 0.5 mm under normal load after 100,000 switching operations.
- Recyclability can be illustrated using the example of a synchronizer ring with a friction lining according to the invention, since the synchronizer ring has the same material base as the construction materials of the transmission.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Operated Clutches (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP93903892A EP0590107A1 (de) | 1992-02-06 | 1993-01-30 | Sinterreibwerkstoff fur reibschlüssige elemente, sowie verfahren zum herstellen derselben |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4203321A DE4203321A1 (de) | 1992-02-06 | 1992-02-06 | Sinterreibwerkstoff fuer reibschluessige elemente, insbesondere von synchronisierungskoerpern, sowie verfahren zum herstellen von sinterreibbelag und reibschluessigem element |
| DEP4203321.7 | 1992-02-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1993016207A1 true WO1993016207A1 (de) | 1993-08-19 |
Family
ID=6451033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1993/000216 Ceased WO1993016207A1 (de) | 1992-02-06 | 1993-01-30 | Sinterreibwerkstoff fur reibschlüssige elemente, sowie verfahren zum herstellen derselben |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0590107A1 (de) |
| DE (1) | DE4203321A1 (de) |
| WO (1) | WO1993016207A1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995018877A3 (de) * | 1994-01-10 | 1995-08-10 | Krebsoege Gmbh Sintermetall | Sinterreibwerkstoff für reibschlüssige elemente sowie reibschlüssiges element |
| CN105798311A (zh) * | 2016-03-21 | 2016-07-27 | 北京科技大学 | 一种高导热铁基粉末冶金高速列车刹车片的制备方法 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH352352A (de) * | 1955-12-31 | 1961-02-28 | Cosid Werke Veb | Verfahren zur Herstellung eines Eisen-Graphit-Verbundwerkstoffes |
| DE1126623B (de) * | 1959-01-09 | 1962-03-29 | Jurid Werke Gmbh | Verfahren fuer die Aufbereitung graphithaltiger Pulvermischungen zur Herstellung von gesinterten Reibwerkstoffen |
| EP0055205A2 (de) * | 1980-12-19 | 1982-06-30 | Abex Corporation | Reibungsmaterial auf Basis von gesintertem Metallpulver |
-
1992
- 1992-02-06 DE DE4203321A patent/DE4203321A1/de not_active Withdrawn
-
1993
- 1993-01-30 WO PCT/EP1993/000216 patent/WO1993016207A1/de not_active Ceased
- 1993-01-30 EP EP93903892A patent/EP0590107A1/de not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH352352A (de) * | 1955-12-31 | 1961-02-28 | Cosid Werke Veb | Verfahren zur Herstellung eines Eisen-Graphit-Verbundwerkstoffes |
| DE1126623B (de) * | 1959-01-09 | 1962-03-29 | Jurid Werke Gmbh | Verfahren fuer die Aufbereitung graphithaltiger Pulvermischungen zur Herstellung von gesinterten Reibwerkstoffen |
| EP0055205A2 (de) * | 1980-12-19 | 1982-06-30 | Abex Corporation | Reibungsmaterial auf Basis von gesintertem Metallpulver |
Non-Patent Citations (2)
| Title |
|---|
| Derwent Publications Ltd., London, GB; AN 76-05049X * |
| Derwent Publications Ltd., London, GB; AN 88-269462 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995018877A3 (de) * | 1994-01-10 | 1995-08-10 | Krebsoege Gmbh Sintermetall | Sinterreibwerkstoff für reibschlüssige elemente sowie reibschlüssiges element |
| US5780170A (en) * | 1994-01-10 | 1998-07-14 | Sintermetallwerk Krebsoge Gmbh | Sychronizing ring having a sintered friction coating |
| CN105798311A (zh) * | 2016-03-21 | 2016-07-27 | 北京科技大学 | 一种高导热铁基粉末冶金高速列车刹车片的制备方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0590107A1 (de) | 1994-04-06 |
| DE4203321A1 (de) | 1993-08-12 |
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