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EP1488125A1 - Etrier de frein a disque - Google Patents

Etrier de frein a disque

Info

Publication number
EP1488125A1
EP1488125A1 EP02722671A EP02722671A EP1488125A1 EP 1488125 A1 EP1488125 A1 EP 1488125A1 EP 02722671 A EP02722671 A EP 02722671A EP 02722671 A EP02722671 A EP 02722671A EP 1488125 A1 EP1488125 A1 EP 1488125A1
Authority
EP
European Patent Office
Prior art keywords
disk brake
cylinder
brake caliper
silicon
caliper according
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.)
Withdrawn
Application number
EP02722671A
Other languages
German (de)
English (en)
Inventor
Giovanni Paolo Pacchiana
Ralf Siegried Goller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brembo SpA
Original Assignee
Freni Brembo SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Freni Brembo SpA filed Critical Freni Brembo SpA
Publication of EP1488125A1 publication Critical patent/EP1488125A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/228—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a separate actuating member for each side
    • 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
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/0016—Brake calipers
    • 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/04—Cylinders
    • 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/06—Pistons
    • 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
    • F16D2200/0034—Materials; Production methods therefor non-metallic
    • F16D2200/0039—Ceramics
    • 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
    • F16D2200/006—Materials; Production methods therefor containing fibres or particles

Definitions

  • the present invention relates to a disk brake caliper and to a piston-cylinder unit designed specifically for the caliper.
  • a disk brake is composed basically of a caliper disposed astride a braking disk and having seats for housing opposed pads for acting on the disk, and by piston-cylinder units for actuating the pads .
  • each pad is formed by a portion on which the piston acts directly and which is called the plate and by a portion which faces the disk and which is called the lining.
  • Both the caliper and the plate are generally made of metal such as, for example, steel for the plates of the pads, and cast iron or aluminium alloys for the calipers, whereas the lining is made of friction material such as, for example, sintered metal powders.
  • the cylinders of the actuating pistons and the supply ducts are normally formed either wholly or at least partially in the caliper body, which requires considerable accuracy in the production of these parts because of problems of sealing with respect to the brake fluid.
  • the above-mentioned disk-brake calipers have two main disadvantages.
  • the metal of which they are made may be subject to corrosion. This gives rise to a need for surface protection of the calipers; in particular, cast-iron calipers are generally galvanized whereas, for aluminium-alloy calipers, it is advisable to perform a surface oxidation treatment, possibly followed by painting.
  • metal calipers In the second place, metal calipers have a considerable weight which affects the non-s ⁇ spended masses of the vehicle.
  • the problem underlying the present invention is that of providing a disk brake caliper which overcomes the disadvantages listed above with reference to the prior art . This problem is solved by a disk brake caliper as specified in the appended claims .
  • Figure 1 shows, in section, the caliper body according to the invention
  • Figure 2 shows, in section, a detail of the caliper of the invention showing the cylinder-piston unit housed in the caliper body
  • Figure 3 is an exploded view showing the cylinder-piston unit in section.
  • the disk brake caliper according to the present invention comprises a caliper body 1 and two cylinder-piston units 2 associated therewith.
  • the caliper body 1 comprises two perforated members 3a, 3b facing one another with their respective holes 4a, 4b in alignment, and a bridge member 5 to be arranged astride the disk-brake disk.
  • a member 6 for fixing to the stub axle of the vehicle is associated with one of the perforated members 3a, 3b.
  • the caliper body 1 is made of a ceramic composite, powder-metallurgical composite, or pyroceram composite material .
  • the ceramic composite material is selected from a material produced from a porous agglomerate of carbon fibres produced by pyrolysis and infiltrated with silicon . in which, during the infiltration stage, silicon carbides are formed and silicon and free carbon fibres remain (C/SiCSi) , or a material produced from a porous agglomerate of silicon carbides infiltrated with silicon (SiSiC) , or alumina (A1 2 0 3 ) .
  • This material is preferably SiSiC.
  • the powder-metallurgical composite material is selected from a material produced from a porous structure of boron carbides infiltrated with aluminium (AlBC) , or a material produced from a porous structure of silicon carbides infiltrated with aluminium (AlSiC) , or a material produced from a porous structure of titanium carbides infiltrated with aluminium (AlTiC) , or silicon oxynitride and aluminium (SiAlON) .
  • Another material which may advantageously be used is selected from the pyroceram group of materials (SCHOTT) of the type normally used in cooking surfaces for cookers .
  • a particularly preferred pyroceram material is (Na 2 0) x (K 2 ⁇ ) y (Li 2 0) 2 (CaO) n (Al 2 0 3 ) m (Si0 2 ) p . These materials are produced by a vitreous fusion process .
  • All of the composite materials mentioned above may be reinforced either with particles or with filaments, according to thermal-mechanical requirements.
  • the cylinder-piston unit 2 which is generally made of steel, comprises a cylinder 7 and a piston 8 housed slidably in the cylinder 7.
  • the cylinder 7 in turn comprises a tubular body 9 and a closure element 10.
  • the tubular body 9 has an outside diameter substantially corresponding to the diameter of the hole 4a or 4b in the caliper body 5.
  • An end portion 11 of the tubular body 9 has a threaded outer surface and an outside diameter smaller than the diameter of the hole 4a or 4b and, at the opposite end, there is a flange 12 projecting radially substantially perpendicular to the axis of the cylinder.
  • the end portion 11 terminates towards the exterior in a stepped portion in which there is a seal 13, for example, an O-ring.
  • the inside surface of the tubular body 9 is cylindrical and, in the vicinity of the end on which the flange 12 is disposed, has two seats for housing a seal 14' and, further towards the exterior, a scraper ring (or dust guard) 14", respectively.
  • the closure element 10 has a tubular connecting portion 15 closed at one end by a plate 16.
  • the tubular connecting portion 15 has an outside diameter substantially corresponding to the diameter of the hole 4a or 4b and an inside surface provided with a thread complementary with the thread of the end portion 11 of the tubular body 9, with which it is intended to be coupled.
  • the thickness of the tube which constitutes the tubular portion 15 substantially corresponds to the difference between the outside diameter of the tubular body 9 and the outside diameter of the end portion 11 of the tubular body so that, when the cylinder 7 is assembled, its outer surface disposed between the flange 12 and the plate 16 is free of steps or interruptions.
  • the plate 16 has a diameter slightly greater than that of the tubular portion 15 so as to form a type of flange.
  • the plate 16, together with the flange 12 of the tubular body 9 thus constitute axial stop means for the cylinder 7.
  • the plate 16 In a substantially central position, the plate 16 has a through-hole 17 which is extended inside the tubular portion 15 by a sleeve 18 coaxial with the tubular portion 15.
  • the sleeve 18 extends for a distance less than the length of the tubular portion 15, more particularly, for about half of its length.
  • the plate 16 also has a second through-hole housing a bleeding plug 21.
  • the piston 8 is hollow and cylindrical and has an outside diameter substantially corresponding to the inside diameter of the tubular portion 15 of the cylinder 7.
  • a reaction surface 19 for receiving the thrust transmitted by the means for actuating the piston is disposed in the vicinity of one end of the piston 8, but in a manner such as to define a recess 20 in which the sleeve 18 is housed when the cylinder-piston unit 2 is in the assembled and non- operative condition.
  • the disk-brake caliper is assembled in the following manner.
  • the tubular body 9 and the closure element 10, which together form the cylinder 7, are inserted in the inner end and in the outer end of the hole 4a or 4b of the caliper body 1, respectively.
  • the term "inner end” of the holes 4a, 4b is intended to define the end closest to the brake disk astride which the caliper is disposed.
  • the term “outer end” is intended to define the end of the hole 4a or 4b remote from the inner end.
  • the tubular body 9 and the closure element 10 are then screwed together so that the flange 12 and the flange formed by the plate 16 come into abutment with the surfaces surrounding the hole 4a or 4b of the caliper body 1.
  • the piston 8 will preferably be fitted in the tubular body 9 of the cylinder 7 before the body is fitted in the hole 4a or 4b.
  • the method of producing the caliper body of ceramic material such as that just described will not be given herein since it is widely known in the art . It will suffice to add here that, once the caliper body has been removed from the pyrolysis mould and infiltrated with silicon, it will undergo a finishing operation with mechanical tools .
  • This finishing can advantageously be limited to the surfaces surrounding the holes 4a, 4b, which are to come into abutment with the flange 12 and with the plate 16 of the cylinder-piston unit 7, as well as to the member 6 for fixing the caliper to the stub axle.
  • the remaining surface of the caliper body 1 can thus remain rough, with considerable saving in time and reduction of waste material .
  • This advantage is extremely significant in view of the fact that machining of a very hard material such as the ceramic material used in the invention is particularly difficult.
  • the ceramic material used in the present invention has mechanical strength and chemical inertness with respect to oxidative phenomena such as not to require further surface treatments of the workpiece and to permit an almost unlimited life of the caliper.
  • the cylinder-piston unit 2 is independent of the caliper body 1 means that, on the one hand, mechanical finishing of the internal surfaces of the holes 4a, 4b is not necessary and, on the other hand, the caliper body can be recycled at the end of the vehicle's life.
  • the cylinder-piston actuator unit can also be replaced if necessary or in the event of damage.
  • the structural characteristics of the caliper body 1 are in no way altered.
  • the ceramic material has a high degree of stiffness which means that it does not undergo deformation even if it is subjected to large stresses.
  • a person skilled in the art may apply to the above-described disk-brake caliper, many modifications and variations all of which, however, are included within the scope of the invention as defined by the appended claims .
  • a mechanical or electromechanical actuator may be used as the actuator unit instead of the hydraulic actuator shown in the example.
  • the means • of fixing the tubular body 9 of the cylinder 7 to the respective closure element 10 may also be other than the threaded coupling system described above, for example, a bayonet coupling may be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un étrier de frein à disque ainsi qu'une unité piston-cylindre conçue spécifiquement pour cet étrier. Plus spécifiquement, l'invention concerne un étrier de frein à disque comprenant un corps d'étrier (1) et, associée à celui-ci, au moins une unité d'actionneur (2) pour une plaquette. Cet étrier se caractérise en ce que le corps d'étrier (1) est constitué d'un matériau composite céramique, d'un matériau composite de la métallurgie des poudres ou d'un matériau composite pyroceram.
EP02722671A 2002-03-21 2002-03-21 Etrier de frein a disque Withdrawn EP1488125A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2002/000182 WO2003081071A1 (fr) 2002-03-21 2002-03-21 Etrier de frein a disque

Publications (1)

Publication Number Publication Date
EP1488125A1 true EP1488125A1 (fr) 2004-12-22

Family

ID=28053448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02722671A Withdrawn EP1488125A1 (fr) 2002-03-21 2002-03-21 Etrier de frein a disque

Country Status (3)

Country Link
EP (1) EP1488125A1 (fr)
AU (1) AU2002253522A1 (fr)
WO (1) WO2003081071A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBG20080064A1 (it) * 2008-12-23 2010-06-24 Brakko Srl Pinza per freni a disco con pistoncino operante in propria camera rimuovibile.
EP2707620B1 (fr) * 2011-05-09 2017-03-08 Petroceramics S.p.A. Corps d'étrier réalisé à partir d'un matériau thermoplastique
EP3051163B1 (fr) 2015-01-28 2019-07-24 Meritor Heavy Vehicle Braking Systems (UK) Limited Frein à disque
FR3057923B1 (fr) * 2016-10-25 2019-03-15 Foundation Brakes France Etrier de frein de vehicule comprenant une liaison de type a baionnette entre un actionneur et un corps d'etrier
US10890223B2 (en) * 2019-03-14 2021-01-12 Shimano Inc. Disc brake caliper

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA516278A (fr) * 1956-05-03 1955-09-06 Dunlop Rubber Company Limited Ensemble de frein a disque de vehicule
GB710690A (en) * 1952-05-29 1954-06-16 Girling Ltd Improvements in or relating to disc brakes for vehicles
GB811525A (en) * 1956-08-07 1959-04-08 Automotive Prod Co Ltd Improvements in or relating to fluid pressure operated disc brakes
FR1534694A (fr) * 1966-11-02 1968-08-02 Messier Fa Frein à disque à étrier fixe
DE3738949A1 (de) * 1987-11-17 1989-05-24 Textar Gmbh Bremse fuer strassen-, schienen- und luftfahrzeuge
GB9108297D0 (en) * 1991-04-18 1991-06-05 Gkn Sankey Ltd Reinforced light metal article and method for its production
DE4430957A1 (de) * 1994-08-31 1996-03-07 Teves Gmbh Alfred Bremssattel für Scheibenbremse
DE19647999A1 (de) * 1996-11-20 1998-05-28 Teves Gmbh Alfred Bremssattel insbesondere für Kraftfahrzeuge
DE19711829C1 (de) * 1997-03-21 1998-09-03 Daimler Benz Ag Verfahren zur Herstellung einer faserverstärkten Verbundkeramik
DE19834571C2 (de) * 1998-07-31 2001-07-26 Daimler Chrysler Ag Verfahren zur Herstellung von Körpern aus faserverstärkten Verbundwerkstoffen und Verwendung des Verfahrens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03081071A1 *

Also Published As

Publication number Publication date
WO2003081071A8 (fr) 2004-03-25
AU2002253522A1 (en) 2003-10-08
WO2003081071A1 (fr) 2003-10-02

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