DE2458048A1 - Internally ventilated brake disc for vehicles - has grooves in disc friction surface and matching cooling channels - Google Patents

Internally ventilated brake disc for vehicles - has grooves in disc friction surface and matching cooling channels

Info

Publication number
DE2458048A1
DE2458048A1 DE19742458048 DE2458048A DE2458048A1 DE 2458048 A1 DE2458048 A1 DE 2458048A1 DE 19742458048 DE19742458048 DE 19742458048 DE 2458048 A DE2458048 A DE 2458048A DE 2458048 A1 DE2458048 A1 DE 2458048A1
Authority
DE
Germany
Prior art keywords
grooves
cooling channels
brake
brake disc
disc
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Withdrawn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
DE19742458048
Other languages
German (de)
Inventor
Wilhelm Kroniger
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.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Priority to DE19742458048 priority Critical patent/DE2458048A1/en
Publication of DE2458048A1 publication Critical patent/DE2458048A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00Parts or details
    • F16D65/02Braking members; Mounting thereof
    • F16D65/12Discs; Drums for disc brakes
    • F16D65/127Discs; Drums for disc brakes characterised by properties of the disc surface; Discs lined with friction material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00Parts or details
    • F16D65/02Braking members; Mounting thereof
    • F16D65/12Discs; Drums for disc brakes
    • F16D65/128Discs; Drums for disc brakes characterised by means for cooling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D2069/004Profiled friction surfaces, e.g. grooves, dimples

Landscapes

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

Abstract

The brakes use parallel discs between which there are cooling channels. There are grooves round the outer surface of the discs. The thermal stress set up by the braking operation can be dissipated and the danger of cracking in the discs is reduced. The grooves (9) are in the friction surface of the discs (3) between the cooling channels (4). The grooves have a V-cross section and the groove surfaces are parallel to the sides of the cooling channels (4). The outer wall thickness of the cooling channels (effectively the friction lining) is similar to the thickness of the inner walls. The cooling channels and the disc grooves can be designed as a spiral.

Description

Innenbelüftete Bremsscheibe Die Erfindung betrifft eine lnnenbelüftete Bremsscheibe für Kraftfahrzeuge, die aus parallel zueinander angeordneten Bremsringscheiben besteht, zwischen denen Kühlkanäle verlaufen, wobei an den Außenflächen der Bremsringscheiben Rillen angeordnet sind. Internally ventilated brake disc The invention relates to an internally ventilated brake disc Brake disk for motor vehicles, consisting of brake ring disks arranged parallel to one another exists, between which cooling channels run, with on the outer surfaces of the brake ring disks Grooves are arranged.

Es sind innenbelüftete Bremsscheiben der eingangs genannten Art bekannt, bei denen die Ausnehmungen in den Reibflächen der parallel zueinander angeordneten Bremsringscheiben ohne konstruktiven und wirkungsmåßigen Zusammenhang zu den zwischen den Bremsringscheiben verlaufenden Kühlkanälen vorgesehen sind. Internally ventilated brake discs of the type mentioned are known, in which the recesses in the friction surfaces are arranged parallel to one another Brake ring disks without any constructive or functional connection to the between the brake ring disks running cooling channels are provided.

Bei starken Beanspruchungen der Bremsscheibe wird die Scheibe selbst sehr weit aufgeheizt, d. h insbesondere der eigentliche Bremsring wird stärker aufgeheizt als der Bremsscheibentopf.If the brake disc is subjected to heavy loads, the disc itself becomes very heated, d. h in particular the actual brake ring is heated up more than the brake disc chamber.

Hierdurch entstehen auf den Ringflächen hohe tangentiale Wärmespannungen, die dann zu radial gerichteten Spannungsrissen in der Scheibenoberfläche führen Die Aufgabe der Erfindung besteht deshalb darin, eine Bremsscheibe der eingangs genannten Art zu schaffen, mit der die auftretenden Wärmespannungen abgebaut werden können und die Rißgefahr der Bremsscheibe vermindert wird Dies wird nach der Erfindung dadurch erzielt, daß die Rillen in den Reibflächen der Bremsringscheiben jeweils zwischen den Kühlkanälen im Bereich einer sich zwischen den Bremsringscheiben erstreckenden inneren Kühlkanalwand angeordnet sind.This creates high tangential thermal stresses on the ring surfaces, which then lead to radial stress cracks in the disc surface The object of the invention is therefore to provide a brake disc of the above to create the type mentioned, with which the thermal stresses that occur are reduced can and the risk of cracking of the brake disc is reduced. This is done according to the invention achieved in that the grooves in the friction surfaces of the brake ring discs, respectively between the cooling channels in the area of one extending between the brake ring disks inner cooling duct wall are arranged.

Die Rillen sind z B keilförmig ausgebildet, wobei deren Keilflächen parallel zu den Seitenflachen der Kühl kanäle verlaufen Die die Reibfiächen bildenden Audenwände des Kühl kanals weisen eine annahernd gleiche Wanddicke auf, wie die übrigen anschließenden innenwand des Kühlkanals Nach weiteren Ausführungen der Erfindung sind die Kühlkanäle und die Rillen bogenförmig an der Bremsringscheibenaußenseite angeordnet oder aber die Kühl kanäle sowie die Rillen der Bremsringscheiben weisen einen radialen Verlauf auf Die mit der Erfindung hauptsächlich erzielten Vorteile bestehen darin, daß die Rillen und die Kühl kanäle in der Weise zueinander angeordnet sind> daß die Bremsscheibe selbst hohen Beanspruchungen gut standhält, wie sie insbesondere bei Hochlastungsfahrzeugen auftreten Durch die zwischen zwei Kühl kanälen angeordneten Rillen ergeben sich in vorteilhafter Weise Wandstärken gleicher Dicke, was die gleichmäßige Abgabe der beim Bremsen aufgenommenen Wärmeenergie an die Umgebungsluft beschleunigt und Wärmespannungen in kurzester Zeit wirksam abgebaut werden können Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen Fig 1 eine Draufsicht auf eine Bremsscheibe, Fig 2 ein weiteres Ausführungsbeispiel einer Bremsscheibe und Figuren 3 bis 6 Ausführungsformen von Kühl kanälen entsprechend dem vergröi3ert dargestellten Schnitt nach der Linie III-III der Figuren 1 und 2 Die aus einem Gub hergestellte Bremsscheibe 1 einer nicht näher dargestellten Bremsanlage eines Kraftfahrzeuges umfaßt zwei mit parallelem Abstand zueinander angeordnete Bremsringscheiben 2 und 3, die außenseitig Reibflächen aufweisen und durch Wandteile von Kühl kanälen 4; 5; 6 und 7 miteinander verbunden sind Die Bremsringscheibe 3 schließt an eine Nabe an, die Befestigungsöffnungen 8 aufweist.The grooves are wedge-shaped, for example, with their wedge surfaces Run parallel to the side surfaces of the cooling channels that form the friction surfaces The outer walls of the cooling channel have approximately the same wall thickness as that remaining adjoining inner wall of the cooling channel According to further embodiments of the invention the cooling channels and the grooves are arched on the outside of the brake ring disc arranged or have the cooling channels and the grooves of the brake ring discs a radial course on The advantages mainly achieved with the invention consist in that the grooves and the cooling channels arranged in such a way to each other are> that the brake disc can withstand even high stresses well, like them occur especially in heavy-duty vehicles through the between two cooling ducts arranged grooves result in wall thicknesses of the same thickness in an advantageous manner, what the uniform release of the thermal energy absorbed during braking to the ambient air accelerated and thermal stresses can be effectively reduced in a very short time An embodiment of the invention is shown in the drawing and will described in more detail below. 1 shows a plan view of a brake disc, 2 shows a further embodiment of a brake disc and FIGS. 3 to 6 embodiments of cooling ducts according to the enlarged section after the line III-III of Figures 1 and 2 The brake disc made from a Gub 1 of a not shown brake system of a motor vehicle comprises two brake ring disks 2 and 3 arranged at a parallel distance from one another, the outside Have friction surfaces and channels through wall parts of cooling 4; 5; 6 and 7 together The brake ring disc 3 connects to a hub, the fastening openings 8 has.

In den Reibflächen der Bremsringscheiben 2 und 3 sind Ausnehmungen in Form von Rillen 9 vorgesehen, die entweder einen radialen Verlauf (Fig 1) oder aber bogenförmig (Fig. 2) zum Außenrand 23 der Bremsringscheiben 2 und 3 hin verlaufen. There are recesses in the friction surfaces of the brake ring disks 2 and 3 provided in the form of grooves 9, which either have a radial course (FIG. 1) or but arcuate (FIG. 2) to the outer edge 23 of the brake ring disks 2 and 3.

Die Rillen 9 sind jeweils zwischen zwei den gleichen Verlauf wie die Rillen 9 aufweisenden Kühl kanälen 4; 5;. 6 und 7 im Bereich einer inneren Kühlkanalwand 14; 15; 24 bzw. 25 angeordnet.The grooves 9 are each between two the same course as the Grooves 9 having cooling channels 4; 5 ;. 6 and 7 in the area of an inner cooling duct wall 14; 15; 24 and 25 respectively.

Die Kühl kanäle können gemäß Fig. 3 einen quadratischen Querschnitt oder gemäß Fig. 5 einen vieleckigen Querschnitt aufweisen. Alle Wandungen der Kühlkanäle weisen annähernd eine gleiche Stärke auf, wobei die die Reibflächen bildenden äußeren Wandungen 10 (Fig. 3) und 11 (Fig. 5) nahezu ohne Materialstärkenänderung in d-ie anschließenden Innenwandungen übergehen, insbesondere in die zwischen zwei KUhlkanälen verlaufenden Innenwandungen 14 (Fig 3) und 15 (Fig. 5) Die quadratisch ausgeführten Kühlkanäle 4 und die vieleckig ausgeführten Kühikanäle 6 sind zwischen den Bremsringscheiben 2 und 3 der Scheibenbremse derart angeordnet, daß bei einer keilförmig ausgeführten Rille die Keilflächen 16 und 17 der Rille 9 etwa parallel zu den Seitenflächen 18, 19 bzw. 20, 21 der Kühl kanäle 4 und 6 verlaufen Bei den weiteren Ausführungen der Kühl kanäle 5 und 7 nach den Figuren 4 und 6 weisen die die Reibflächen bildenden äußeren Wandungen 12 und 13 mit den daran anschließenden inneren Wandungen der Kühl kanäle ebenfalls eine annähernd gleiche Wandungsdicke auf. The cooling channels can, as shown in FIG. 3, have a square cross-section or have a polygonal cross-section according to FIG. 5. All walls of the cooling channels have approximately the same thickness, the outer ones forming the friction surfaces Walls 10 (Fig. 3) and 11 (Fig. 5) with almost no change in material thickness in that subsequent inner walls merge, in particular into the one between two KUhlkanäle extending inner walls 14 (Fig 3) and 15 (Fig. 5) The square executed Cooling channels 4 and the polygonal cooling channels 6 are between the brake ring disks 2 and 3 of the disc brake arranged so that in a wedge-shaped Groove the wedge surfaces 16 and 17 of the groove 9 approximately parallel to the side surfaces 18, 19 and 20, 21 of the cooling channels 4 and 6 run With the others Designs of the cooling channels 5 and 7 according to FIGS. 4 and 6 have the friction surfaces forming outer walls 12 and 13 with the adjoining inner walls the cooling channels also have approximately the same wall thickness.

Statt keilförmiger Rillen 9 sind auch Rillen anderer Form denkbar, wie z. B. halbrunde Rillen oder Nuten rechteckigen oder quadratischen Querschnitts; Instead of wedge-shaped grooves 9, grooves of other shapes are also conceivable, such as B. semicircular grooves or grooves of rectangular or square cross-section;

Claims (5)

Patentansprüche Innenbelüftete Bremsscheibe für Kraftfahrzeuge, die aus parallel zueinander angeordneten Bremsringscheiben besteht, zwischen denen Kühlkanäle verlaufen5 wobei an den Außenflächen der Bremsringscheiben Rillen angeordnet sind, dadurch gekennzeichnet, daß die Rillen (9) in den Reibflächen der Bremsringscheiben (2 und 3) jeweils zwischen den Kühl kanälen (4; 5; 6; 7) im Bereich einer sich zwischen den Bremsringscheiben erstreckenden inneren Kühlkanalwand (14; 15; 24; 25) angeordnet sind. Internally ventilated brake disc for motor vehicles that consists of brake ring disks arranged parallel to one another, between which cooling channels run5 with grooves being arranged on the outer surfaces of the brake ring disks, characterized in that the grooves (9) in the friction surfaces of the brake ring disks (2 and 3) each between the cooling channels (4; 5; 6; 7) in the area between the inner cooling duct wall (14; 15; 24; 25) extending across the brake ring disks are. 2. Bremsscheibe nach Anspruch 1, dadurch gekennzeichnet, daß die Rillen (9) keilförmig ausgebildet sind, wobei deren Keilflächen (16 und 17) parallel zu Seitenflächen (18 und 19 bzw.2. Brake disc according to claim 1, characterized in that the grooves (9) are wedge-shaped, with their wedge surfaces (16 and 17) parallel to Side surfaces (18 and 19 resp. 20 und 21) der Kühlkanäle (4 bzw 6) verlaufen.20 and 21) of the cooling channels (4 and 6) run. 3. Bremsscheibe nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die die Reibflächen bildenden Außenwände (10; 11; 12; 13) des Kühlkanals (4; 5; 6; 7) eine annähernd gleiche Wanddicke aufweisen wie die übrigen anschließenden Innenwände des Kühl kanals.3. Brake disc according to claims 1 and 2, characterized in that that the outer walls (10; 11; 12; 13) of the cooling channel (4; 5; 6; 7) have approximately the same wall thickness as the other subsequent ones Inner walls of the cooling channel. 4. Bremsscheibe nach den Anspruchen 1 bis 3, dadurch gekennzeichnet, daß die Kühlkanäle (4; 5; 6; 7) und die Rillen (9) bogenförmig an der Bremsringscheibenaußenseite (23) angeordnet sind 4. Brake disc according to claims 1 to 3, characterized in that that the cooling channels (4; 5; 6; 7) and the grooves (9) arcuate on the outside of the brake ring disc (23) are arranged 5. Bremsscheibe nach den Anspruche 1 bis 3, dadurch gekennzeichnet, daß die Kühl kanäle (4; 5; 6; 7) sowie die Rillen (9) der Bremsscheibe (2 und 3) einen radialen Verlauf aufweisen. L e e r s e i t e5. Brake disc according to claims 1 to 3, characterized in that that the cooling channels (4; 5; 6; 7) and the grooves (9) of the brake disc (2 and 3) have a radial course. L e r s e i t e
DE19742458048 1974-12-07 1974-12-07 Internally ventilated brake disc for vehicles - has grooves in disc friction surface and matching cooling channels Withdrawn DE2458048A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19742458048 DE2458048A1 (en) 1974-12-07 1974-12-07 Internally ventilated brake disc for vehicles - has grooves in disc friction surface and matching cooling channels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742458048 DE2458048A1 (en) 1974-12-07 1974-12-07 Internally ventilated brake disc for vehicles - has grooves in disc friction surface and matching cooling channels

Publications (1)

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DE2458048A1 true DE2458048A1 (en) 1976-06-10

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485667A1 (en) * 1980-06-26 1981-12-31 Valeo Cast brake disc for railway stock - uses spoke arms from hub to locate twin annular friction plates separated by helical webs forming radial air ways
FR2498711A1 (en) * 1981-01-27 1982-07-30 Valeo BRAKE ROTATING BODY WITH VENTILATION CHANNELS
US5417313A (en) * 1991-07-23 1995-05-23 Akebno Brake Industry Co., Ltd. Disc rotor for preventing squeal
DE19638187A1 (en) * 1995-09-19 1997-03-27 Aisin Seiki Disc brake rotor for vehicle
DE19637492A1 (en) * 1996-09-14 1998-04-02 Winter Fritz Eisengiesserei Automotive ventilated
DE29704133U1 (en) * 1997-03-07 1998-08-27 Unger, Uwe, 68519 Viernheim Brake disc for vehicle disc brakes
EP1048872A3 (en) * 1999-04-29 2001-01-10 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Device for preventing disc brake squeal
DE19943893A1 (en) * 1999-09-14 2001-03-15 Continental Teves Ag & Co Ohg Brake disc
US6279698B1 (en) * 1998-09-11 2001-08-28 Brembo S.P.A. High efficiency braking and self-draining brake-disk with visual wear control
EP1180613A2 (en) * 2000-08-08 2002-02-20 WABCO GmbH & CO. OHG Full brake disc with cooling system for road vehicles
DE10119150C1 (en) * 2001-04-19 2002-11-14 Buderus Guss Internally-ventilated brake disc, for automobile disc brake, has ventilation channels formed by removal of material from below partial regions in friction surfaces of coupled friction ring discs
WO2004020863A1 (en) * 2002-08-30 2004-03-11 Freni Brembo S.P.A. Braking band of a ventilated disc-brake disc_with grooves and cooling ribs
DE10355204A1 (en) * 2003-11-26 2005-08-04 Heel, Klaus, Designer (grad.), 75223 Niefern-Öschelbronn Motor vehicle brake disc for brake system of motor vehicle, has spiral twist moving from inside to outside/outside to inside, based on direction of rotation, in order to develop air gaps, and having hollow body filled with cooling agent
WO2006092270A1 (en) * 2005-03-03 2006-09-08 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Brake-disc, in particular for a vehicle
US20100206674A1 (en) * 2009-02-16 2010-08-19 Gm Global Technology Operations, Inc. Disc Brake Rotors with Tilted Vane Geometry
JP2013044342A (en) * 2011-08-22 2013-03-04 Create Engineering:Kk Brake disc rotor
US8851245B2 (en) 2010-12-03 2014-10-07 Brake Parts Inc Llc Brake rotor
CN109595276A (en) * 2018-12-30 2019-04-09 河北百龙汽车配件制造有限公司 Brake disc with scale-hold groove
DE102014116359B4 (en) 2013-11-12 2021-08-26 Toyota Jidosha Kabushiki Kaisha Brake disc rotor

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485667A1 (en) * 1980-06-26 1981-12-31 Valeo Cast brake disc for railway stock - uses spoke arms from hub to locate twin annular friction plates separated by helical webs forming radial air ways
FR2498711A1 (en) * 1981-01-27 1982-07-30 Valeo BRAKE ROTATING BODY WITH VENTILATION CHANNELS
US4469203A (en) * 1981-01-27 1984-09-04 Valeo Rotatable brake member provided with ventilation channels
US5417313A (en) * 1991-07-23 1995-05-23 Akebno Brake Industry Co., Ltd. Disc rotor for preventing squeal
DE19638187A1 (en) * 1995-09-19 1997-03-27 Aisin Seiki Disc brake rotor for vehicle
DE19638187C2 (en) * 1995-09-19 1999-04-15 Aisin Seiki Brake disc
DE19637492A1 (en) * 1996-09-14 1998-04-02 Winter Fritz Eisengiesserei Automotive ventilated
DE29704133U1 (en) * 1997-03-07 1998-08-27 Unger, Uwe, 68519 Viernheim Brake disc for vehicle disc brakes
US6279698B1 (en) * 1998-09-11 2001-08-28 Brembo S.P.A. High efficiency braking and self-draining brake-disk with visual wear control
US6347691B1 (en) 1999-04-29 2002-02-19 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Arrangement for preventing the squealing of a disk brake
EP1048872A3 (en) * 1999-04-29 2001-01-10 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Device for preventing disc brake squeal
US6467590B2 (en) 1999-04-29 2002-10-22 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Arrangement for preventing the squealing of a disk brake
EP1085230A1 (en) * 1999-09-14 2001-03-21 Continental Teves AG & Co. oHG Brake disc
DE19943893A1 (en) * 1999-09-14 2001-03-15 Continental Teves Ag & Co Ohg Brake disc
EP1180613A2 (en) * 2000-08-08 2002-02-20 WABCO GmbH & CO. OHG Full brake disc with cooling system for road vehicles
EP1180613A3 (en) * 2000-08-08 2003-01-02 WABCO GmbH & CO. OHG Full brake disc with cooling system for road vehicles
DE10119150C1 (en) * 2001-04-19 2002-11-14 Buderus Guss Internally-ventilated brake disc, for automobile disc brake, has ventilation channels formed by removal of material from below partial regions in friction surfaces of coupled friction ring discs
WO2004020863A1 (en) * 2002-08-30 2004-03-11 Freni Brembo S.P.A. Braking band of a ventilated disc-brake disc_with grooves and cooling ribs
DE10355204A1 (en) * 2003-11-26 2005-08-04 Heel, Klaus, Designer (grad.), 75223 Niefern-Öschelbronn Motor vehicle brake disc for brake system of motor vehicle, has spiral twist moving from inside to outside/outside to inside, based on direction of rotation, in order to develop air gaps, and having hollow body filled with cooling agent
WO2006092270A1 (en) * 2005-03-03 2006-09-08 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Brake-disc, in particular for a vehicle
US20100206674A1 (en) * 2009-02-16 2010-08-19 Gm Global Technology Operations, Inc. Disc Brake Rotors with Tilted Vane Geometry
US8851245B2 (en) 2010-12-03 2014-10-07 Brake Parts Inc Llc Brake rotor
US9163683B2 (en) 2010-12-03 2015-10-20 Brake Parts Inc Llc Brake rotor
JP2013044342A (en) * 2011-08-22 2013-03-04 Create Engineering:Kk Brake disc rotor
DE102014116359B4 (en) 2013-11-12 2021-08-26 Toyota Jidosha Kabushiki Kaisha Brake disc rotor
CN109595276A (en) * 2018-12-30 2019-04-09 河北百龙汽车配件制造有限公司 Brake disc with scale-hold groove

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8141 Disposal/no request for examination