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
  • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
  • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc 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
  • F16D65/78—Features relating to cooling
  • F16D65/84—Features relating to cooling for disc brakes
  • F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
• • 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
• • 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
  • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
  • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
  • F16D65/095—Pivots or supporting members therefor
• • 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
  • F16D65/78—Features relating to cooling
• • 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
  • F16D65/78—Features relating to cooling
  • F16D65/80—Features relating to cooling for externally-engaging brakes
  • F16D65/807—Features relating to cooling for externally-engaging brakes with open cooling system, e.g. cooled by air
• • 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
  • F16D2055/002—Brake calipers assembled from a plurality of parts
• • 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
  • F16D65/78—Features relating to cooling
  • F16D2065/785—Heat insulation or reflection
• • 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
  • F16D65/78—Features relating to cooling
  • F16D2065/789—External cooling ribs
• • 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
  • F16D2200/0034—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
  • F16D65/00—Parts or details
  • F16D65/005—Components of axially engaging brakes not otherwise provided for
  • F16D65/0068—Brake calipers
  • F16D65/0075—Brake calipers assembled from a plurality of parts

Definitions

• the invention relates to the technical field of disc brakes, and in particular to the pads fitted to such brakes.
• kinetic parameters such as the speed of rotation of the disc, the kinetic energy of the vehicle carrying the brake in question and in particular the kinetic energy to be dissipated at each braking;
• the thermal parameters of the brake and in particular its ability to resist the heat generated during the conversion of kinetic energy into thermal energy, or even to dissipate this heat.
• One of the aims of the invention is to overcome the drawbacks of the prior art, by proposing high-performance brake pads, but whose high temperature in the event of intensive use does not degrade the components of the yoke.
• a disc brake caliper pad has been developed, the pad comprising a support plate.
• the support sheet has cooling fins, thus creating a convection zone.
• the cooling fins are simple to manufacture on the support plate, and they considerably increase the surface area for convection exchange between the wafer and the ambient air surrounding the wafer.
• the convection zone makes it possible to evacuate heat by convection, which makes it possible to use the pad intensively and that the heat generated during braking is dissipated. There is no degradation of the other components of the caliper.
• the fins being contained in the plane of the sheet, the thickness of the wafer is not increased, and the size of the assembly is not penalized.
• the support sheet has a rear face with a support zone, the support zone is thermally insulated from other components of the stirrup by a thermal insulator. Thus, the mechanical components that generate the support on the pads are protected from heat
• the thermal insulation only covers part of the rear face, leaving an uncovered rear zone which is also part of the convection zone.
• the support sheet has a front face receiving a lining with a friction zone, and the lining only covers part of the front face, leaving an uncovered front zone, which is also part of the convective area.
• the uncovered rear zone represents at least 10% of the surface area of the rear face, and preferably at least 20%.
• the convection zone is located on either side of the support zone.
• the calories are correctly drained from the support area which is hot, because covered by the insulation, towards the different portions of the uncovered area.
• the support sheet is made of a low-alloy steel, comprising less than 0.3% by mass of carbon, and preferably less than 0.2%, and vanadium in an amount between 0.2 and 0.3% by mass, the remainder preferably being iron with possibly reasonably foreseeable impurities.
• the sheet is for example made of 15CDV6 steel. The presence of vanadium notably improves the hot resistance of the sheet.
• the insulation is in the form of a sheet, which is preferably maintained by a clipped foil on the support plate.
• the insulation comprises mica.
• the foil is made of austenitic steel, which is a metal that conducts less heat than other alternative grades.
• the invention also relates to a caliper for a disc brake, incorporating pads according to the aforementioned characteristics.
• a caliper makes it possible to obtain better braking performance than the devices of the prior art, because the thermal resistance constraint of its components has been overcome. For example, it is possible to apply a greater clamping force.
• FIG.1 is a perspective view, seen from behind, of a support plate for a brake pad according to the invention.
• FIG.2 is a perspective view, seen from behind, of a support plate for another brake pad according to the invention.
• FIG.3 is a perspective view, seen from behind, of such a plate.
• FIG.4 is a front view of the support plate.
• FIG.5 is a partial front view of a stirrup according to the invention.
• FIG.6 is a perspective view of such a stirrup.
• the invention essentially consists in designing, for a brake pad (10), an arrangement of the thermal insulation (13) such that at least one uncovered rear area (12b) either apparent, that is to say that it is not covered by the thermal insulation (13).
• this insulator (13) is necessary to protect the other components of the stirrup (20) from the heat, but to limit its presence to what is strictly necessary, that is to say to the support zone (12a) only (the interface between the rear face (12) and the parts applying the clamping force) makes it possible to create at least one convection zone (16) making it possible to evacuate the heat generated during braking.
• the thermal insulator (13) advantageously comprises mica, which makes it possible to obtain a high-performance insulator, even with a small thickness.
• the mica sheet is held in position on the sheet (11) by means of a click (18), which is snapped onto the sheet (11).
• the sheet (11) is oversized so that:
• the area of the uncovered rear area (12b) represents at least 10% of the area of the rear face (12), and preferably at least 20%. In the illustrated mode, the area of the uncovered rear area (12b) represents approximately 40% of the area of the rear face (12).
• the surface area of the uncovered front zone (14b) represents at least 10% of the surface area of the front face (14), and preferably at minus 20%. In the illustrated mode, the surface area of the uncovered front zone (14b) represents approximately 30% of the surface area of the front face (14).
• the convection zone (16) is arranged on the right and left. Depending on the space available, it is also possible to extend the convection zone (16) upwards and downwards.
• the pad (10) thus designed is capable of withstanding very high braking forces, generating a very large amount of heat, then dissipating this heat quickly. It is therefore important that the material that constitutes it is suitable for undergoing such thermal stresses, which are deleterious due to:
• a suitable material for responding to such thermal and of course mechanical stresses is a 15CDV6 steel alloy.
• tests were carried out by the Applicant in comparison with a steel known as "lmex700", or S 690 QL according to European standard EN 10025-6: March 2005, and initially used to produce the sheet (11) and 15CDV6.
• the tests carried out reside in bending tests on lmex700 test pieces and 15CDV6 test pieces.
• the specimens have identical dimensions, except for the thickness of 4 mm for Imex 700 and 3 mm for 15CDV6.
• the specimen is held horizontally and fixedly at one end by a clamp and a mass is suspended from the other end of the specimen. A section of the specimen, close to the flange, was reduced to ensure that the specimen bends there. The distance between the free end of the specimen and the area of reduced section is 150 mm
• the specimen is first tested at a temperature of 21°C by suspending masses until plastic deformation of the reduced section.
• test results are compiled in the table below, noting that given the difference in thickness between the specimens, the calculated induced stress has been normalized to take account of said difference.
• the plate (10) being designed to withstand very high braking forces, it is necessary to reinforce the areas ensuring its kinematic connection with the caliper (20).
• a slide-type kinematic connection is obtained by semi-cylindrical lugs present in the sheet (11) and cooperating with the bushings (21) of the stirrup (20).
• the direction of heavy braking is always the same, that of the advance of the vehicle: it is therefore not wise to reinforce the connection on both sides of the pad (10).
• the plate (10) is, in the illustrated mode, asymmetrical: a single reinforced portion (19) is present, arranged so as to retain the plate (10) in the braking direction (DF) illustrated in Figure 5.
• the pads (10) being asymmetrical, they should not be mounted upside down on the caliper (20). Keying means are therefore present. Referring to Figure 6, it may be for example a stop (22) mounted on the bracket (20), and the reinforced portion (19) is configured to abut against the stop (22). It is therefore not possible to mount the pad (10) upside down.
• the pads (10) according to the invention have excellent thermal performance, and in particular make it possible to maintain the temperature of the caliper (20) at only 60° C. while the braking forces have driven the disc (40 ) at a temperature of the order of 800° C. (the metal of the disc (40) is red-hot).
• the size of the pads (10) is very limited, especially in terms of thickness. In addition, too much thickness tends to tilt the pads during braking. A restricted pad thickness also helps to limit uneven pad wear.
• the plate (10) and the caliper (20) can be shaped differently from the examples given without departing from the scope of the invention, which is defined by the claims.
• the pad (10) and the caliper (20) can be adapted in terms of cost, functionality and performance.

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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=80999127

Family Applications (1)

Country Status (5)

Family Cites Families (6)

• 2022
  • 2022-01-31 FR FR2200828A patent/FR3132337B1/fr active Active
  • 2022-10-24 WO PCT/FR2022/052012 patent/WO2023144456A1/fr not_active Ceased
  • 2022-10-24 CN CN202280090712.XA patent/CN118647809A/zh active Pending
  • 2022-10-24 US US18/729,373 patent/US20250334159A1/en active Pending
  • 2022-10-24 EP EP22805915.0A patent/EP4453441A1/de active Pending

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