WO2016016537A1 - Brake drum comprising an annular body spaced away from the friction ring - Google Patents

Brake drum comprising an annular body spaced away from the friction ring Download PDF

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Publication number
WO2016016537A1
WO2016016537A1 PCT/FR2015/051909 FR2015051909W WO2016016537A1 WO 2016016537 A1 WO2016016537 A1 WO 2016016537A1 FR 2015051909 W FR2015051909 W FR 2015051909W WO 2016016537 A1 WO2016016537 A1 WO 2016016537A1
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WO
WIPO (PCT)
Prior art keywords
ring
brake drum
annular mass
brake
wall
Prior art date
Application number
PCT/FR2015/051909
Other languages
French (fr)
Inventor
Vincent PUISEUX
Original Assignee
Peugeot Citroen Automobiles Sa
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 Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Priority to EP15759504.2A priority Critical patent/EP3175135A1/en
Priority to CN201580041270.XA priority patent/CN106574677B/en
Publication of WO2016016537A1 publication Critical patent/WO2016016537A1/en

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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
    • F16D65/10—Drums for externally- or internally-engaging brakes
    • 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
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/1304—Structure
    • F16D2065/1332—Structure external ribs, e.g. for cooling or reinforcement
    • 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
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0007—Casting

Definitions

  • the present invention relates to a brake drum, in particular for braking a motor vehicle, and a motor vehicle equipped with such brake drums.
  • Motor vehicles generally comprise a braking system comprising a brake pedal acting on a master cylinder, for transmitting by hydraulic circuits a pressure of the fluid to the brakes which act on each wheel of the vehicle.
  • a known type of brake comprises a drum attached to a hub rotating with the wheel, having a circular ring comprising an inner cylindrical surface receiving the pressure of two brake segments which deviate under the effect of an internal hydraulic control cylinder .
  • the brake drum generally made of a cast iron cast member, has by its mass a certain capacity for absorbing thermal energy during pronounced braking, and its outer surface a low exchange capacity by convection to the ambient air, even with small grooves or ribs generally disposed outside the crown.
  • the ring being held axially on the front side facing the outside of the vehicle, by a radial flange forming the fastening on the hub, this flange at the same time ensures better cooling of the front part of this ring, as well as radial mechanical holding of this front part.
  • a known type of drum presented in particular by the document FR-B1-2830914, comprises an outer ring of aluminum alloy overmolded on the rear and outer surfaces of a brake drum.
  • Another known drum type presented in particular by the document FR-B1 -2966537 comprises a cylindrical sheet whose inner surface constitutes the braking track, the outer surface receiving a ring fixed on it, before then receiving by overmolding a thermal mass of aluminum alloy that clings to this ring.
  • the present invention is intended to avoid these disadvantages of the prior art.
  • a cast iron one-piece molded brake drum comprising a circular ring having a cylindrical internal surface of friction, and a radial flange arranged axially on the front side, designed to fix this drum on a hub, characterized in that it comprises a continuous annular mass arranged around the ring and spaced radially from this ring, which is connected to the ring by a substantially transverse wall, and a succession of ribs arranged in axial planes, which connect the ring. crown to this wall.
  • This brake drum is that the continuous annular mass disposed at a distance from the ring, with the wall connecting it to this ring rigidly by imposing a fixed spacing, forms a radial rib comprising a height giving a high rigidity to the crown, remaining more noticeably cold and therefore dilatant little, this which significantly limits the expansion of the front side of the drum that is most likely to open.
  • the axial ribs maintain the wall supporting the annular portion in the same transverse plane, avoiding buckling under the effect of the high stresses due to expansion, which allows for a relatively thin wall. It is then possible to make a ring of reduced section, which gives a lighter brake drum while having a lower deformation.
  • the brake drum according to the invention may further comprise one or more of the following features, which may be combined with each other.
  • the total radial height of the annular mass with respect to the ring is greater than half the width of the internal friction surface.
  • the radial height may be about two-thirds the width of the inner friction surface.
  • the annular mass is axially arranged in the rear half of the width of the internal friction surface.
  • the radial wall axially comprises a thickness less than that of the annular mass.
  • the axial ribs may terminate radially outwardly on the side of the annular mass.
  • the invention also relates to a motor vehicle comprising a braking system equipped with brake drums which comprise any one of the preceding characteristics.
  • FIG. 1 is a perspective view of a brake drum according to the invention.
  • - Figure 2 is an axial section of the brake drum
  • - Figure 3 is a perspective view of a brake drum according to a variant
  • FIG. 4 is an axial section of the brake drum.
  • Figures 1 and 2 show a brake drum having a circular ring 2 having a cylindrical inner friction surface 4 receiving the pressure of the brake shoes, which is centered on a main axis A.
  • the ring gear 2 is connected on the front side, indicated by the arrow "AV", by a curvature to a radial flange 6 having a central transverse planar portion having four bores 8 receiving the fixing screws of a wheel on its hub, as well as a complementary bore 12 receiving a drum clamping screw on the hub.
  • a central bore 10 in the middle of the radial flange 6, carries out the centering of the brake drum on the hub.
  • a succession of ribs 18 arranged in axial planes and equally spaced, comprise a substantially triangular shape having a base covering the entire width of the annular ring 2, in front of the radial wall 16, and a height covering the entire height of this wall radial, stopping just below the annular mass 14.
  • An annular mass 14 is obtained fixed very rigidly to the ring 2 by the transverse wall 16, with a distance kept constant by this wall, giving the assembly a high stiffness.
  • the ring 2 being able to heat up strongly by the friction of the brake shoes, the annular mass 14 then being heated slightly by its distance, and by its very good ventilation thanks to the large surface of exchange with the air, we obtain with this rigid assembly a significant limitation of the thermal expansion of the rear portion of this ring.
  • this rigid assembly in particular, in the tangential direction there is a work in compression of the crown 2 and in traction of the annular mass 14.
  • the large number of regularly distributed ribs 18 consolidates the transverse wall 16 by preventing a buckling of its substantially transverse shape during the high stresses caused by an expansion of the crown 2.
  • the assembly formed by the annular mass 14, the transverse wall 16 and the axial ribs 18 constitutes a thermal mass that rapidly absorbs the calories generated at the friction on the ring 2, as well as a large surface area towards the outside of the brake drum, which favors by its rotation the thermal exchanges with the ambient air.
  • the amount of additional material constituted by the annular mass 14, the transverse wall 16 and the axial ribs 18, being relatively limited, can be realized a brake drum lightened compared to equivalent solutions concerning the resistance to intensive braking.
  • the studies presented show a possible reduction in mass of around 8%.
  • this brake drum does not include undercut in the axial direction, can be easily achieved with a mold comprising only two cavities forming two parts.
  • This type of molding remains simple and economical, the cost of the brake drum according to the invention hardly changes.
  • Figures 3 and 4 show alternatively a brake drum comprising a slightly different design, having a transverse wall 16 which has a greater thickness, close to that of the annular mass 14, and axial ribs 18 which arrive radially to the outside substantially in the middle of this annular mass.
  • the radial height H of the annular mass 14 with respect to the ring 2 is greater than half the width L of the inner friction surface 4.
  • the radial height H may in particular be equal to at about two-thirds of this width L.
  • annular mass 14 is in both cases axially in the rear half of the width of the inner friction surface 4, so as to ensure better holding of this rear portion of the ring 2.
  • the reduced weight of the brake drum makes it possible to reduce the consumption of the vehicle, and to improve the dynamic behavior of this vehicle by reducing unsprung masses.

Abstract

The invention relates to an integral iron-cast brake drum and comprising: - a circular ring (2) having an inner cylindrical friction surface; and - a radial flange (6) axially placed on the front side and provided in order to attach said drum onto a hub. Said brake drum is characterized in that it also comprises: - a continuous annular body (14) that is placed around the ring (2), radially spaced therefrom, and connected to the ring by a substantially transverse wall (16); and - a series of ribs (18) placed within axial planes and connecting the ring to said wall.

Description

TAMBOUR DE FREIN COMPORTANT UNE MASSE ANNULAIRE ESPACÉE DE LA COURONNE DE FROTTEMENT  BRAKE DRUM COMPRISING AN ANNULAR MASS SPACED WITH FRICTION CROWN
La présente invention concerne un tambour de frein, en particulier pour le freinage d'un véhicule automobile, ainsi qu'un véhicule automobile équipé de tels tambours de frein. The present invention relates to a brake drum, in particular for braking a motor vehicle, and a motor vehicle equipped with such brake drums.
Les véhicules automobiles comportent généralement un système de freinage comprenant une pédale de frein agissant sur un maître-cylindre, pour transmettre par des circuits hydrauliques une pression du fluide vers des freins qui agissent sur chaque roue du véhicule.  Motor vehicles generally comprise a braking system comprising a brake pedal acting on a master cylinder, for transmitting by hydraulic circuits a pressure of the fluid to the brakes which act on each wheel of the vehicle.
Un type de frein connu comporte un tambour fixé à un moyeu tournant avec la roue, présentant une couronne circulaire comprenant une surface cylindrique intérieure recevant la pression de deux segments de freins qui s'écartent sous l'effet d'un vérin hydraulique intérieur de commande.  A known type of brake comprises a drum attached to a hub rotating with the wheel, having a circular ring comprising an inner cylindrical surface receiving the pressure of two brake segments which deviate under the effect of an internal hydraulic control cylinder .
Pour les véhicules automobiles, le tambour de frein réalisé généralement en une seule pièce moulée en fonte, comporte par sa masse une certaine capacité d'absorption d'énergie thermique lors des freinages prononcés, et par sa surface extérieure une faible capacité d'échange par convection vers l'air ambiant, même avec des petites rainures ou nervures disposées généralement à l'extérieur de la couronne.  For motor vehicles, the brake drum generally made of a cast iron cast member, has by its mass a certain capacity for absorbing thermal energy during pronounced braking, and its outer surface a low exchange capacity by convection to the ambient air, even with small grooves or ribs generally disposed outside the crown.
Il faut alors prévoir une masse de fonte importante au niveau de la couronne circulaire, pour absorber quasiment la totalité de l'énergie thermique dégagée lors des freinages prononcés. Ces tambours de frein comportent une masse relativement élevée.  It is then necessary to provide a large cast iron mass at the level of the circular ring, to absorb almost all the thermal energy released during pronounced braking. These brake drums have a relatively high mass.
Par ailleurs la couronne étant maintenue axialement du côté avant tourné vers l'extérieur du véhicule, par un flasque radial formant la fixation sur le moyeu, ce flasque assure en même temps un meilleur refroidissement de la partie avant de cette couronne, ainsi qu'un maintien mécanique radial de cette partie avant.  Furthermore, the ring being held axially on the front side facing the outside of the vehicle, by a radial flange forming the fastening on the hub, this flange at the same time ensures better cooling of the front part of this ring, as well as radial mechanical holding of this front part.
On obtient lors des échauffements importants une déformation différentielle de la couronne, qui présente une forme légèrement conique ouverte vers l'arrière. La portée des segments de frein est alors réduite, et peut donner une surface circulaire formant une ligne étroite décalée vers l'avant, la capacité de freinage chute fortement. During significant heating, a differential deformation of the ring is obtained which has a slightly conical shape. open to the back. The range of the brake shoes is then reduced, and can give a circular surface forming a narrow line shifted forward, the braking capacity drops sharply.
Pour réduire la masse du tambour de frein tout en améliorant sa capacité d'absorption d'énergie thermique, un type de tambour connu, présenté notamment par le document FR-B1 -2830914, comporte une couronne extérieure en alliage d'aluminium surmoulée sur les surfaces arrière et extérieure d'un tambour de frein.  To reduce the mass of the brake drum while improving its thermal energy absorption capacity, a known type of drum, presented in particular by the document FR-B1-2830914, comprises an outer ring of aluminum alloy overmolded on the rear and outer surfaces of a brake drum.
Un autre de type de tambour connu, présenté notamment par le document FR-B1 -2966537, comporte une tôle de forme cylindrique dont la surface intérieure constitue la piste de freinage, la surface extérieure recevant un anneau fixé dessus, avant de recevoir ensuite par surmoulage une masse thermique en alliage d'aluminium qui s'accroche sur cet anneau.  Another known drum type, presented in particular by the document FR-B1 -2966537 comprises a cylindrical sheet whose inner surface constitutes the braking track, the outer surface receiving a ring fixed on it, before then receiving by overmolding a thermal mass of aluminum alloy that clings to this ring.
Toutefois ces types de tambour de frein comportant deux métaux différents, sont relativement complexes à mettre en œuvre, et sont plus chers.  However these types of brake drum with two different metals, are relatively complex to implement, and are more expensive.
La présente invention a notamment pour but d'éviter ces inconvénients de la technique antérieure.  The present invention is intended to avoid these disadvantages of the prior art.
Elle propose à cet effet un tambour de frein moulé d'une seule pièce en fonte, comportant une couronne circulaire présentant une surface intérieure cylindrique de frottement, et un flasque radial disposé axialement du côté avant, prévu pour fixer ce tambour sur un moyeu, caractérisé en ce qu'il comporte une masse annulaire continue disposée autour de la couronne et espacée radialement de cette couronne, qui est reliée à la couronne par une paroi sensiblement transversale, ainsi qu'une succession de nervures disposées dans des plans axiaux, qui relient la couronne à cette paroi.  It proposes for this purpose a cast iron one-piece molded brake drum, comprising a circular ring having a cylindrical internal surface of friction, and a radial flange arranged axially on the front side, designed to fix this drum on a hub, characterized in that it comprises a continuous annular mass arranged around the ring and spaced radially from this ring, which is connected to the ring by a substantially transverse wall, and a succession of ribs arranged in axial planes, which connect the ring. crown to this wall.
Un avantage de ce tambour de frein est que la masse annulaire continue disposée à une certaine distance de la couronne, avec la paroi la reliant à cette couronne de manière rigide en imposant un espacement fixe, forme une nervure radiale comprenant une hauteur donnant une forte rigidité à la couronne, restant de plus sensiblement froide et donc se dilatant peu, ce qui limite de manière importante la dilatation du côté avant du tambour qui a le plus tendance à s'ouvrir. An advantage of this brake drum is that the continuous annular mass disposed at a distance from the ring, with the wall connecting it to this ring rigidly by imposing a fixed spacing, forms a radial rib comprising a height giving a high rigidity to the crown, remaining more noticeably cold and therefore dilatant little, this which significantly limits the expansion of the front side of the drum that is most likely to open.
De plus les nervures axiales maintiennent la paroi soutenant la partie annulaire dans un même plan transversal, en évitant son flambage sous l'effet des fortes contraintes dues aux dilatations, ce qui permet de réaliser une paroi relativement fine. On peut alors réaliser une couronne de section réduite, qui donne un tambour de frein plus léger tout en présentant une déformation plus faible.  In addition the axial ribs maintain the wall supporting the annular portion in the same transverse plane, avoiding buckling under the effect of the high stresses due to expansion, which allows for a relatively thin wall. It is then possible to make a ring of reduced section, which gives a lighter brake drum while having a lower deformation.
Le tambour de frein selon l'invention peut de plus comporter une ou plusieurs des caractéristiques suivantes, qui peuvent être combinées entre elles.  The brake drum according to the invention may further comprise one or more of the following features, which may be combined with each other.
Avantageusement, la hauteur radiale totale de la masse annulaire par rapport à la couronne, est supérieure à la moitié de la largeur de la surface intérieure de frottement.  Advantageously, the total radial height of the annular mass with respect to the ring is greater than half the width of the internal friction surface.
En particulier, la hauteur radiale peut être égale à environ les deux tiers de la largeur de la surface intérieure de frottement.  In particular, the radial height may be about two-thirds the width of the inner friction surface.
Avantageusement, la masse annulaire est axialement disposée dans la moitié arrière de la largeur de la surface intérieure de frottement.  Advantageously, the annular mass is axially arranged in the rear half of the width of the internal friction surface.
Selon un mode de réalisation, la paroi radiale comporte axialement une épaisseur inférieure à celle de la masse annulaire.  According to one embodiment, the radial wall axially comprises a thickness less than that of the annular mass.
En particulier, les nervures axiales peuvent se terminer radialement vers l'extérieur sur le côté de la masse annulaire.  In particular, the axial ribs may terminate radially outwardly on the side of the annular mass.
L'invention a aussi pour objet un véhicule automobile comprenant un système de freinage équipé de tambours de frein qui comportent l'une quelconque des caractéristiques précédentes.  The invention also relates to a motor vehicle comprising a braking system equipped with brake drums which comprise any one of the preceding characteristics.
L'invention sera mieux comprise et d'autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description ci-après donnée à titre d'exemple, en référence aux dessins annexés dans lesquels :  The invention will be better understood and other features and advantages will emerge more clearly on reading the following description given by way of example, with reference to the appended drawings in which:
- la figure 1 est une vue en perspective d'un tambour de frein selon l'invention ;  - Figure 1 is a perspective view of a brake drum according to the invention;
- la figure 2 est une section axiale de ce tambour de frein ; - la figure 3 est une vue en perspective d'un tambour de frein suivant une variante ; et - Figure 2 is an axial section of the brake drum; - Figure 3 is a perspective view of a brake drum according to a variant; and
- la figure 4 est une section axiale de ce tambour de frein.  - Figure 4 is an axial section of the brake drum.
Les figures 1 et 2 présentent un tambour de frein comportant une couronne circulaire 2 présentant une surface intérieure cylindrique de frottement 4 recevant la pression des segments de frein, qui est centrée sur un axe principal A.  Figures 1 and 2 show a brake drum having a circular ring 2 having a cylindrical inner friction surface 4 receiving the pressure of the brake shoes, which is centered on a main axis A.
La couronne 2 est reliée du côté avant, indiqué par la flèche « AV », par une courbure à un flasque radial 6 comportant une partie plane transversale centrale présentant quatre perçages 8 recevant les vis de fixation d'une roue sur son moyeu, ainsi qu'un perçage complémentaire 12 recevant une vis de serrage du tambour sur le moyeu.  The ring gear 2 is connected on the front side, indicated by the arrow "AV", by a curvature to a radial flange 6 having a central transverse planar portion having four bores 8 receiving the fixing screws of a wheel on its hub, as well as a complementary bore 12 receiving a drum clamping screw on the hub.
Un alésage central 10 au milieu du flasque radial 6, réalise le centrage du tambour de frein sur le moyeu.  A central bore 10 in the middle of the radial flange 6, carries out the centering of the brake drum on the hub.
Une masse annulaire continue 14 disposée à l'extérieur de la couronne A continuous annular mass 14 disposed outside the crown
2, est reliée à cette couronne par une paroi radiale continue 16 d'épaisseur réduite par rapport à cette masse annulaire, qui se trouve dans un plan transversal situé à proximité de l'extrémité arrière de cette couronne. 2, is connected to this ring by a continuous radial wall 16 of reduced thickness relative to this annular mass, which lies in a transverse plane located near the rear end of this ring.
Une succession de nervures 18 disposées dans des plans axiaux et également espacées, comportent une forme sensiblement triangulaire présentant une base recouvrant toute la largeur de la couronne annulaire 2, en avant de la paroi radiale 16, et une hauteur recouvrant toute la hauteur de cette paroi radiale, en s'arrêtant juste en dessous de la masse annulaire 14.  A succession of ribs 18 arranged in axial planes and equally spaced, comprise a substantially triangular shape having a base covering the entire width of the annular ring 2, in front of the radial wall 16, and a height covering the entire height of this wall radial, stopping just below the annular mass 14.
On obtient une masse annulaire 14 fixée très rigidement à la couronne 2 par la paroi transversale 16, avec une distance maintenue constante par cette paroi, donnant une forte raideur à l'ensemble.  An annular mass 14 is obtained fixed very rigidly to the ring 2 by the transverse wall 16, with a distance kept constant by this wall, giving the assembly a high stiffness.
La couronne 2 pouvant s'échauffer fortement par le frottement des segments de frein, la masse annulaire 14 s'échauffant alors peu par son éloignement, et par sa très bonne ventilation grâce à la grande surface d'échange avec l'air, on obtient avec cet ensemble rigide une limitation importante de la dilatation thermique de la partie arrière de cette couronne. On a en particulier dans la direction tangentielle un travail en compression de la couronne 2, et en traction de la masse annulaire 14. The ring 2 being able to heat up strongly by the friction of the brake shoes, the annular mass 14 then being heated slightly by its distance, and by its very good ventilation thanks to the large surface of exchange with the air, we obtain with this rigid assembly a significant limitation of the thermal expansion of the rear portion of this ring. In particular, in the tangential direction there is a work in compression of the crown 2 and in traction of the annular mass 14.
De plus le grand nombre de nervures 18 régulièrement réparties, consolide la paroi transversale 16 en empêchant un flambage de sa forme sensiblement transversale lors des contraintes élevées provoquées par une dilatation de la couronne 2.  In addition, the large number of regularly distributed ribs 18 consolidates the transverse wall 16 by preventing a buckling of its substantially transverse shape during the high stresses caused by an expansion of the crown 2.
Par ailleurs l'ensemble formé par la masse annulaire 14, la paroi transversale 16 et les nervures axiales 18, constitue une masse thermique qui absorbe de manière rapide les calories générées au niveau du frottement sur la couronne 2, ainsi qu'une surface importante tournée vers l'extérieur du tambour de frein, qui favorise par sa rotation les échanges thermiques avec l'air ambiant.  Moreover, the assembly formed by the annular mass 14, the transverse wall 16 and the axial ribs 18 constitutes a thermal mass that rapidly absorbs the calories generated at the friction on the ring 2, as well as a large surface area towards the outside of the brake drum, which favors by its rotation the thermal exchanges with the ambient air.
On peut alors prévoir une couronne annulaire 2 comportant une masse nettement réduite par rapport au tambour de frein conventionnel réalisé par moulage en fonte.  One can then provide an annular ring 2 having a significantly reduced mass relative to the conventional brake drum made by cast iron.
La quantité de matière additionnelle constituée par la masse annulaire 14, la paroi transversale 16 et les nervures axiales 18, étant relativement limitée, on peut réaliser un tambour de frein allégé par rapport aux solutions équivalentes concernant la tenue aux freinages intensifs. Les études présentées montrent une possibilité de réduction de la masse de l'ordre de 8%.  The amount of additional material constituted by the annular mass 14, the transverse wall 16 and the axial ribs 18, being relatively limited, can be realized a brake drum lightened compared to equivalent solutions concerning the resistance to intensive braking. The studies presented show a possible reduction in mass of around 8%.
On notera que le moulage de ce tambour de frein ne comportant pas de contre-dépouille dans la direction axiale, peut être réalisé facilement avec un moule comprenant seulement deux empreintes formant deux parties. Ce type de moulage reste simple et économique, le prix de revient du tambour de frein selon l'invention ne change quasiment pas.  Note that the molding of this brake drum does not include undercut in the axial direction, can be easily achieved with a mold comprising only two cavities forming two parts. This type of molding remains simple and economical, the cost of the brake drum according to the invention hardly changes.
Les figures 3 et 4 présentent en variante un tambour de frein comprenant un dessin un peu différent, présentant une paroi transversale 16 qui comporte une épaisseur plus importante, proche de celle de la masse annulaire 14, et des nervures axiales 18 qui arrivent radialement vers l'extérieur sensiblement au milieu de cette masse annulaire. On notera que pour ces deux versions, la hauteur radiale H de la masse annulaire 14 par rapport à la couronne 2, est supérieure à la moitié de la largeur L de la surface intérieure de frottement 4. La hauteur radiale H peut en particulier être égale à environ les deux tiers de cette largeur L. Figures 3 and 4 show alternatively a brake drum comprising a slightly different design, having a transverse wall 16 which has a greater thickness, close to that of the annular mass 14, and axial ribs 18 which arrive radially to the outside substantially in the middle of this annular mass. Note that for these two versions, the radial height H of the annular mass 14 with respect to the ring 2, is greater than half the width L of the inner friction surface 4. The radial height H may in particular be equal to at about two-thirds of this width L.
Par ailleurs la masse annulaire 14 se trouve dans les deux cas axialement dans la moitié arrière de la largeur de la surface intérieure de frottement 4, de manière à assurer une meilleure tenue de cette partie arrière de la couronne 2.  Furthermore, the annular mass 14 is in both cases axially in the rear half of the width of the inner friction surface 4, so as to ensure better holding of this rear portion of the ring 2.
La masse réduite du tambour de frein permet en particulier de réduire la consommation du véhicule, et d'améliorer le comportement dynamique de ce véhicule par la réduction des masses non suspendues.  In particular, the reduced weight of the brake drum makes it possible to reduce the consumption of the vehicle, and to improve the dynamic behavior of this vehicle by reducing unsprung masses.

Claims

REVENDICATIONS
1 - Tambour de frein moulé d'une seule pièce en fonte, comportant une couronne circulaire (2) présentant une surface intérieure cylindrique de frottement (4), et un flasque radial (6) disposé axialement du côté avant, prévu pour fixer ce tambour sur un moyeu, caractérisé en ce qu'il comporte une masse annulaire continue (14) disposée autour de la couronne (2) et espacée radialement de cette couronne, qui est reliée à la couronne par une paroi sensiblement transversale (16), ainsi qu'une succession de nervures (18) disposées dans des plans axiaux, qui relient la couronne à cette paroi. Cast iron brake drum integrally formed with a circular ring (2) having a cylindrical inner surface of friction (4), and a radial flange (6) arranged axially on the front side, intended to fix this drum. on a hub, characterized in that it comprises a continuous annular mass (14) arranged around the ring (2) and spaced radially from this ring, which is connected to the ring by a substantially transverse wall (16), as well as a succession of ribs (18) arranged in axial planes, which connect the crown to this wall.
2 - Tambour de frein selon la revendication 1 , caractérisé en ce que la hauteur radiale totale (H) de la masse annulaire (14) par rapport à la couronne (2), est supérieure à la moitié de la largeur (L) de la surface intérieure de frottement (4).  2 - brake drum according to claim 1, characterized in that the total radial height (H) of the annular mass (14) relative to the ring (2) is greater than half the width (L) of the inner surface of friction (4).
3 - Tambour de frein selon la revendication 2, caractérisé en ce que la hauteur radiale (H) est égale à environ les deux tiers de la largeur (L) de la surface intérieure de frottement (4).  3 - brake drum according to claim 2, characterized in that the radial height (H) is equal to about two thirds of the width (L) of the inner friction surface (4).
4 - Tambour de frein selon l'une quelconque des revendications précédentes, caractérisé en ce que la masse annulaire (14) est axialement disposée dans la moitié arrière de la largeur de la surface intérieure de frottement (4).  4 - brake drum according to any one of the preceding claims, characterized in that the annular mass (14) is axially disposed in the rear half of the width of the inner friction surface (4).
5 - Tambour de frein selon l'une quelconque des revendications précédentes, caractérisé en ce que la paroi radiale (16) comporte axialement une épaisseur inférieure à celle de la masse annulaire (14).  5 - Brake drum according to any one of the preceding claims, characterized in that the radial wall (16) axially comprises a thickness less than that of the annular mass (14).
6 - Tambour de frein selon l'une quelconque des revendications précédentes, caractérisé en ce que les nervures axiales (18) se terminent radialement vers l'extérieur sur le côté de la masse annulaire (14).  6 - brake drum according to any one of the preceding claims, characterized in that the axial ribs (18) terminate radially outwardly on the side of the annular mass (14).
7 - Véhicule automobile comprenant un système de freinage équipé de tambours de frein, caractérisé en ce que ces tambours sont réalisés selon l'une quelconque des revendications précédentes.  7 - A motor vehicle comprising a brake system equipped with brake drums, characterized in that these drums are made according to any one of the preceding claims.
PCT/FR2015/051909 2014-08-01 2015-07-10 Brake drum comprising an annular body spaced away from the friction ring WO2016016537A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15759504.2A EP3175135A1 (en) 2014-08-01 2015-07-10 Brake drum comprising an annular body spaced away from the friction ring
CN201580041270.XA CN106574677B (en) 2014-08-01 2015-07-10 Brake drum including annular member spaced from friction ring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1457479A FR3024512B1 (en) 2014-08-01 2014-08-01 BRAKE DRUM COMPRISING AN ANNULAR MASS SPACE OF THE FRICTION CROWN
FR1457479 2014-08-01

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CN (1) CN106574677B (en)
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EP4130505B1 (en) 2021-08-06 2023-11-01 Edertek, S.Coop Drum and drum brake for vehicles

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FR2830914B1 (en) 2001-10-12 2004-12-17 Renault REDUCED MASS BRAKING DRUM WITH INCREASED PERFORMANCE
US20080308364A1 (en) * 2007-06-13 2008-12-18 Webb Wheel Products, Inc. Lightweight brake drum with middle position squealer band
FR2936289A1 (en) * 2008-09-25 2010-03-26 Renault Sas DRUM AND HUB THERMAL EXCHANGE BRAKE DRUM IMPROVED IN PARTICULAR FOR MOTOR VEHICLE, AND EQUIPPED VEHICLE
FR2966537B1 (en) 2010-10-22 2012-11-30 Peugeot Citroen Automobiles Sa BRAKE DRUM, IN PARTICULAR FOR MOTOR VEHICLE, COMPRISING OVERMOLDING
FR2992385A1 (en) * 2012-06-26 2013-12-27 Peugeot Citroen Automobiles Sa Brake drum for brake of car, has annular chamber abutted on entire periphery of circular axial crown and containing cooling material, which consists of aluminum knitting immersed in paraffin

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JP2001099200A (en) * 1999-09-28 2001-04-10 Honda Motor Co Ltd Drum brake structure of unlevelled ground running wheel
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2830914B1 (en) 2001-10-12 2004-12-17 Renault REDUCED MASS BRAKING DRUM WITH INCREASED PERFORMANCE
US20080308364A1 (en) * 2007-06-13 2008-12-18 Webb Wheel Products, Inc. Lightweight brake drum with middle position squealer band
FR2936289A1 (en) * 2008-09-25 2010-03-26 Renault Sas DRUM AND HUB THERMAL EXCHANGE BRAKE DRUM IMPROVED IN PARTICULAR FOR MOTOR VEHICLE, AND EQUIPPED VEHICLE
FR2966537B1 (en) 2010-10-22 2012-11-30 Peugeot Citroen Automobiles Sa BRAKE DRUM, IN PARTICULAR FOR MOTOR VEHICLE, COMPRISING OVERMOLDING
FR2992385A1 (en) * 2012-06-26 2013-12-27 Peugeot Citroen Automobiles Sa Brake drum for brake of car, has annular chamber abutted on entire periphery of circular axial crown and containing cooling material, which consists of aluminum knitting immersed in paraffin

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EP3175135A1 (en) 2017-06-07
FR3024512B1 (en) 2016-08-05
CN106574677A (en) 2017-04-19
FR3024512A1 (en) 2016-02-05
CN106574677B (en) 2020-09-01

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