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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D65/00—Parts or details
  • F16D65/02—Braking members; Mounting thereof
  • F16D65/12—Discs; Drums for disc brakes
  • F16D65/127—Discs; Drums for disc brakes characterised by properties of the disc surface; Discs lined with friction material
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/06—Alloys based on aluminium with magnesium as the next major 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
  • F16D65/00—Parts or details
  • F16D65/02—Braking members; Mounting thereof
  • F16D65/12—Discs; Drums for disc brakes
  • F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
• • 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
  • F16D69/025—Compositions based on an organic binder
  • F16D69/026—Compositions based on an organic binder containing fibres
• • 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
• • 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
  • F16D2200/00—Materials; Production methods therefor
  • F16D2200/0004—Materials; Production methods therefor metallic
  • F16D2200/0026—Non-ferro
  • F16D2200/003—Light metals, e.g. aluminium

Definitions

• the present invention relates to friction linings and corresponding friction lining mixtures which are particularly suitable for use in disc brakes with aluminum brake discs or rotors.
• the invention relates to the use of aluminum-containing friction linings in combination with aluminum-containing brake disks or rotors.
• DE 694 03 791 T2 describes a friction lining composition for a rotor made from an aluminum-metal composite base material, which is intended to prevent the rotor from degrading during the braking process.
• An average coefficient of friction of 0.38-0.42 should also be set.
• This friction lining mixture contains 2-12% by weight porous copper powder to reduce the wear between the aluminum rotor and the friction lining.
• WO 94/15112 relates to a brake lining for disc brakes with aluminum brake discs, the composition of which is to be determined in such a way that the coefficient of friction is consistently high up to a temperature of 400 ° C and drops significantly in the range up to 450 ° C.
• Aluminum-containing friction linings are also known in the prior art.
• WO 2015/193361 A1 discloses a copper-free friction material, which fibers of an Al-Mg alloy, such as. B. AIMg5, at 5-9.75% by weight.
• DE 198 28 301 A1 relates to a friction lining made of an Al-Zn alloy, e.g. AIZn5, 0.5 to 15% by weight and therefore has anti-corrosion properties.
• Friction linings which can contain more than 90% by weight of aluminum metal (powder) and / or aluminum alloys are described in KR 10 2001 009 1694.
• CN 104265816 discloses a friction lining which has 20-30% by weight of an Al alloy and silicon carbide (SiC).
• the Al alloy serves as a replacement for steel fibers in the friction lining mixture and leads to improved friction, wear and tear
• Aluminum brake disks or rotors in the prior art usually copper-containing friction linings are proposed.
• copper has been classified by various environmental authorities as a heavy metal and therefore not environmentally friendly, as a result of which a trend towards copper-free brake or friction linings has become noticeable.
• copper-free friction linings on aluminum disks usually have a very low coefficient of friction of around 0.3.
• Aluminum or aluminum alloys e.g. the replacement of steel fibers in such coverings or an improvement in the anti-corrosion properties of these coverings.
• the present invention was therefore based on the object of providing friction linings or
• Brake disks or rotors ensure a sufficiently high coefficient of friction and at the same time do not have the disadvantages of the friction linings from the prior art with regard to abrasion, wear and temperature properties, or only have them to a significantly reduced extent.
• Brake disks or rotors are generally understood to be those brake disks or rotors that contain or consist of aluminum in the form of metal or in the form of aluminum alloys.
• the newer materials for brake disks and rotors are so-called
• AI-MMC aluminum metal matrix composites
• the reinforcement material used is preferably SiC (10 to 90% by volume), but aluminum oxide and other ceramic materials can also be used.
• the concentration of aluminum in brake disks of the prior art, as can also be used in the present invention, is usually 20-60% by volume (Al as metal), in particular about 40% by volume.
• the object according to the invention is achieved by using aluminum and / or its so-called compounds, which are in particular aluminum alloys, in the production of friction linings.
• aluminum is used as the metal (e.g. as unalloyed metal powder) as the friction lining component.
• Aluminum alloys are low alloyed AL alloys preferred. Wear-resistant Al alloys can have positive effects on the friction behavior of the friction linings equipped in this way. This applies in particular to alloys with increased temperature resistance.
• a concentration of at least 5% by weight up to 30% by weight is preferred, higher aluminum concentrations also being possible.
• the data in% by weight relate to the proportion of aluminum (expressed as metal, aluminum alloys converted accordingly to the Al content) in the finished friction lining mixture, from which the friction lining is then produced according to the usual methods known in the prior art.
• Preferred concentrations of aluminum in the friction linings are 5-25% by weight, in particular 10-20% by weight.
• the friction linings preferred according to the invention contain aluminum in the form of metallic aluminum (unalloyed), in particular in powder form, and / or in the form of
• Al alloys with magnesium (Mg) or titanium (Ti) have proven to be particularly suitable for solving the present problem.
• Other alloy partners, such as silicon (Si) are also fundamentally suitable.
• This can be binary, ternary or quaternary alloy systems, of which the binary aluminum alloys are particularly preferred.
• alloys such as AITM 0 and AlMgSO should be mentioned here.
• the alloys according to the invention contain one or more of the following metals Mg, Ti, Si, Ba, Sr, Ca, Be, Zr, Cr, Fe, Sn, Bi and always aluminum.
• the friction lining mixtures according to the invention can also be powder of a metal mixture from the above
• the alloys are manufactured by melting and homogenizing the components to form a finely dispersed system. A variety of such alloys are commercially available.
• the proportion of the alloys according to the invention in the friction lining mixture or the finished friction lining can preferably be from 5 to 30% by weight, in particular from 10 to 20% by weight. These alloys can be used in all common friction linings. A special adaptation of the other components of the friction lining to the alloys described here is therefore not necessary. In the mixtures of the prior art, for example, only the Zn or Zn alloy component is preferably replaced by the alloys according to the invention.
• the weight proportion of the Al alloys in the friction lining mixture depends on the desired Al content, taking into account any additional Al metal (powder).
• the alloys according to the invention are preferably introduced into the friction lining mixture in powder or particle form. Tin sulfides can be used as a lubricant with a
• Weight fraction between about 0.5 to 10 wt .-%, preferably about 2 to 8 wt .-%, can be included.
• the aluminum alloys which are preferably in strand or block form, are first liquefied and then atomized in order to produce essentially spherical particles. These particles are then mixed with a conventional friction material mixture or with the components of a conventional friction lining mixture and pressed to form a friction lining at known temperatures and pressures.
• powdery particles can also be formed directly from the melt of the alloy, e.g. by spraying or by hurling over the edge of a rotating disc.
• the particle size of the alloys according to the invention is preferably in the range from 100 pm to yOO pm.
• the fillers for friction linings according to the invention can be contained individually or in combination with other fillers, metal oxides, metal silicates and / or metal sulfates.
• the fibrous substances preferably consist of aramid fibers and / or other organic or inorganic fibers.
• steel wool and / or copper wool can be contained as metals.
• Tin sulfides with a weight fraction of 0.5 to 10% by weight, preferably 2 to 8% by weight, are preferably used as lubricants.
• the tin sulfides can be added to the friction lining mixture as a powder, for example.
• the alloys according to the invention can in principle be in any
• Friction mixture can be used.
• the friction linings according to the invention can be produced by conventional methods and methods known from the prior art, i. E. by mixing all the starting components and compressing the ones thus obtained
• Friction lining mixture at increased pressure and temperature.
• the AI Alloy in the typical application as a powder with the other mixture components in a mixer, whereby the alloy particles are homogeneously distributed in the friction material during the mixing process. This also means that due to the friction process when a corresponding brake pad is used, new Al-containing material is always transferred to the
• Friction lining surface arrives. As a result, uniform or constant conditions always prevail on its surface during the application cycle of the friction lining.
• a friction material mixture according to the invention can be composed, for example, as follows:
• Aluminum-Mg / Ti alloy 10-20 (> 5% by weight Al)
• mixtures according to the invention can also contain, for example, steel / steel wool, copper and / or copper alloys.
• the present invention thus relates to the use of the Al alloys according to the invention and of Al metal for friction linings for use in combination with

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Braking Arrangements (AREA)

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Citations (9)

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• 2019
  • 2019-06-27 ES ES19735526T patent/ES2974726T3/es active Active
  • 2019-06-27 US US17/618,437 patent/US12565917B2/en active Active
  • 2019-06-27 WO PCT/EP2019/067261 patent/WO2020259844A1/de not_active Ceased
  • 2019-06-27 CN CN201980097420.7A patent/CN114008347B/zh active Active
  • 2019-06-27 EP EP19735526.6A patent/EP3775602B1/de active Active
  • 2019-06-27 JP JP2021571745A patent/JP7626533B2/ja active Active
• 2024
  • 2024-01-30 JP JP2024011858A patent/JP2024050722A/ja active Pending

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