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
• • 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
  • F16D2200/0008—Ferro
  • F16D2200/0021—Steel
• • 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
• • 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
  • F16D2250/0084—Assembly or disassembly

Definitions

• the present invention relates to an improved brake drum for a vehicle, in particular for a motor vehicle. It also relates to a vehicle, in particular a motor vehicle, which is equipped with such improved brake drums.
• the brake drums that equip the motor vehicles are generally made of cast iron.
• aluminum brake drums or drums called "bi-material” drums have already been produced, which include a cast iron track molded onto a steel or aluminum alloy flange. for foundry.
• FR 1058672 discloses a motor vehicle brake drum, which comprises a circular axial ring comprising an inner friction track, which is connected to a hub in rotation.
• the axial ring has, on its outer surface, a thermal mass.
• This thermal mass comprises a steel retaining ring fixed on the axial ring, which has fastening forms on which a light alloy ring is overmolded.
• the axial ring is part of a part made by stamping a sheet, which has a substantially flat connecting radial portion, comprising fastening means on the hub.
• the object of the present invention is to provide an improved brake drum, which, compared to known cast iron drums of the prior art, has a substantial bulk gain while having thermal and mechanical characteristics which are equivalent to those of cast iron drums.
• Another object of the present invention is to provide such a brake drum, which dissipates heat better during braking than do the drums "bi-material" of the prior art.
• the present invention relates to an improved brake drum for a vehicle, particularly for a motor vehicle, which comprises:
• a bowl cylindrical, which consists of a radial connecting part surrounded by a circular axial strip,
• a metal insert which mainly comprises a circular band forcibly joined to the outer surface of the circular axial band of the bowl, and
• the bowl is made by stamping and cutting a steel sheet.
• the metal insert it is made by stamping a steel sheet.
• the steel metal insert can be made by machining by removal of material.
• the metal insert may advantageously be assembled on the bowl by a hooping method or by press fitting.
• the overmolded crown is aluminum or aluminum alloy.
• the metal insert has bores distributed over its constituent circular band, which may advantageously be evenly distributed over the entire peripheral surface of said circular band.
• the circular band of the metal insert is of slightly conical shape with conicity turned towards the opposite direction to the radial connecting portion of the bowl, in the assembled position of one metal insert on the bowl.
• This taper may be, for example, of the order of 5 ° angle.
• the invention also relates to a method of producing a brake drum according to that described above in outline, and this new method comprises the following steps, taken in combination:
• finishing machining is performed on the assembly thus constituted by the bowl, the metal insert and the ring.
• the invention finally relates to a vehicle, in particular a motor vehicle, equipped with drum brakes, and in this vehicle at least one brake drum is in accordance with that described above in outline.
• FIG. 1 is a schematic perspective view of the cylindrical bowl of the brake drum according to the present invention
• FIG. 2 is a schematic perspective view of the metal insert of the brake drum according to the present invention
• FIG. 3 illustrates the step of forcibly mounting the metal insert of FIG. 2 on the cylindrical bowl of FIG. 1;
• FIGS. 4 and 5 illustrate the following step according to which a metal crown is overmolded on the outer peripheral surface of the assembly of FIG. 3,
• FIG. 6 is a diagram illustrating the different geometrical data of the metal insert of the brake drum, according to the present invention.
• FIG. 7 is a schematic perspective view of the brake drum according to the invention, gross overmolding, and
• FIG. 8 is a schematic perspective view of the brake drum of Figure 7, after the completion of machining finishing.
• the bowl 10 of generally cylindrical shape, made by stamping and cutting a steel sheet, comprises a radially connecting portion 11, substantially planar, which comprises, on the one hand, a centering bore 14 on the hub, not shown. a wheel, and secondly, holes 13 for receiving axial clamping screws on said wheel hub.
• the radial connecting portion 11 is surrounded by a circular axial strip 12, of external diameter "D" and of substantially constant thickness, which comprises an inner surface 12B intended to form the friction surface of brake linings.
• FIG. 2 represents a metal insert, of general reference 20, consisting mainly of a continuous circular sheet metal band 21, which is of constant cross section with a thickness "e".
• the metal insert 20 has two rows of holes 25 regularly distributed over the entire periphery of the circular band 21.
• the reference 22 designates a lateral flange peripheral extending the circular band 21, which is substantially 90 ° angle of said circular band 21, that is to say slightly inclined relative to the radial direction of 1 insert.
• a first step of assembling the constituent parts of the brake drum according to the invention is constituted by the "tight" assembly of the metal insert 20 on the cylindrical outer surface 12A of the circular axial strip 12 of the bowl 10.
• This "tight" assembly is produced by elastic deformation of the metal insert 20.
• the outer peripheral surface of the assembly constituted by the bowl 10 and the metal insert 20 assembled receives by overmoulding an aluminum or aluminum alloy ring of general reference 30, radial thickness "s" out of the bosses or molding ribs 30A.
• the aluminum or aluminum alloy of the ring 30 fills the holes 25 to the circular axial strip 12 of the bowl 10.
• the brake drum, overmoulding gross, is shown in the drawing of Figure 7, with its bosses or molding ribs 30A.
• the holes 25, made by machining or punching can be evenly distributed over several rows over the entire periphery of the circular band 21, for example in two rows, as shown in FIG. be inclined or not with respect to the plane of the circular band 21.
• the holes 25 may, alternatively, not be aligned transversely, but be arranged staggered, for example.
• the circular band 21 constituting the metal insert 20 is of conical shape with low conicity facing the direction opposite to the central connecting portion 11 of the bowl 10 in the assembled position of the metal insert 20 on the bowl 10.
• This conicity, angle "a" may be, by way of non-limiting example of the object and scope of the present invention, of the order of 5 ° d 'angle.
• the operation of the brake drum described above is identical to that of a conventional cast iron brake drum, the heat generated on the friction surface being stored in the aluminum instead of being stored in the cast iron.
• the drum of the invention has excellent mechanical strength and stores the heat created by the friction while braking,

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=45815903

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (6)

• 2012
  • 2012-02-10 FR FR1251269A patent/FR2986841B1/fr not_active Expired - Fee Related
• 2013
  • 2013-02-06 CN CN201380008612.9A patent/CN104583636A/zh active Pending
  • 2013-02-06 EP EP13746818.7A patent/EP2888502A2/de not_active Withdrawn
  • 2013-02-06 WO PCT/FR2013/050247 patent/WO2013117858A2/fr active Application Filing

Non-Patent Citations (1)

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