Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
  • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
  • B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
• • 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
  • F16D55/224—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 common actuating member for the braking members
  • F16D55/225—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 common actuating member for the braking members the braking members being brake pads
  • F16D55/226—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 common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes

Definitions

• the invention relates to the field of braking systems for vehicles, more particularly braking systems of the electromechanical type.
• the mechanical clamping devices comprise at least one electric actuator such as a motor equipped with a rotating output shaft. Consequently, these mechanical clamping devices of the electromechanical type must include a mechanism for converting the rotational movement of the output shaft of the electric actuator into the translational movement necessary for bringing the friction elements together, which makes them more complicated than those of the hydraulic type.
• the subject of the invention is a clamping device for a braking system intended to exert a relative movement between friction elements and comprising a frame supporting an electric actuator intended to provide the clamping force and a mechanism for converting the rotational movement of an output shaft of the electric actuator in translational movement which is coupled to the electric actuator in order to allow the relative displacement movement between the friction elements in an axial rectilinear direction, characterized in that the conversion mechanism is of the ball screw type comprising a nut coupled to a screw by balls and in that the clamping device comprises a mechanism for radial and/or tangential decoupling of a stop intended to receive a friction element relative to at a free end of the screw of the conversion mechanism in order to improve the mechanical resistance of the latter.
• the conversion mechanism makes it possible, through the use of point connections using balls, to reduce the friction between the screw and the nut.
• the force transmission of the electric actuator will have little impact on performance, that is to say that little force will be absorbed by the conversion mechanism.
• the screw is moved with movements of great precision and with negligible surface wear.
• the rotational movement of the output shaft of the electric actuator converted into translational movement is completely reversible between a position close to the friction elements, called contact with the disc, and a position far from the friction elements, called rest in which the friction elements do not touch the disc, ensuring very high reliability.
• the radial and/or tangential decoupling mechanism reduces or even eliminates any lever arm phenomenon and compensates for any eccentric moment by displacement of the stop relative to the screw to transmit only a negligible proportion of non-reactive stresses.
• axial to the balls and the nut of the conversion mechanism we therefore understand that caulking and more generally the deformation of the organs of the conversion mechanism are avoided in order to guarantee great robustness, that is to say in particular not having to change the clamping device for at least the duration of use of the vehicle.
• FIG. 1 is an exploded view of an example of a decoupling mechanism according to the invention.
• the radial and/or tangential decoupling mechanism 19 comprises a connecting element 21 and a flange 23.
• the element 21 preferably forms at least one connection of the sliding pivot type between the stop 11 and the free end 17a of the screw 17 in order to limit the transmission to the balls 18 of the conversion mechanism 15, of the radial and/or tangential stresses received by the stop 11.
• the decoupling mechanism 19 is arranged to authorize a tangential translation ⁇ , - ⁇ up to two millimeters of the stop 11 relative to the sliding pivot connecting element 21, that is to say the maximum travel possible (between ⁇ and - ⁇ ) of the connecting element 21 in the tangential direction in the opening 23d of the flange 23 by abutment of the peripheral wall 20b against respectively the translation limitation elements 23c of the flange 23.
• the body 21a has a second end 22 intended to be fitted with clearance into the free end 17a of the screw 17. More precisely, the contact surface 22a and the peripheral wall 22b of the second end 22 preferably have complementary shapes respectively to the bottom 17c and to the internal wall 17b of the free end 17a of the screw 17 in order to prevent relative rotation between the free end 17a of the screw 17 and the connecting element 21 with a pivot sliding around the axial direction but allow relative tangential rotations ⁇ , - ⁇ and radial ⁇ , - ⁇ between the connecting element 21 and the screw 17 in particular in order to be able to "follow » the movements of the sliding pivot connection of the first end 20.
• the contact surface 22a and the bottom 17c are of complementary partially spherical shapes respectively convex and concave in order, thanks to the interlocking clearances, to authorize, in a certain measurement of the relative tangential ⁇ , - ⁇ and radial ⁇ , - ⁇ rotations between the connecting element 21 and the screw 17.
• the sections of the peripheral wall 22b of the second end 22 and of the internal wall 17b of the free end 17a of the screw 17 are of complementary asymmetrical shapes in order to prevent relative rotation between the free end 17a of the screw 17 and the pivot connecting element 21 sliding around the axial direction A.
• the sections of the peripheral wall 22b of the second end 22 and of the internal wall 17b of the free end 17a of the screw 17 are polygonal (octagonal in Figures 5 and 7).
• an elliptical section of the internal wall 17b of the free end 17a of the screw 17 of a shape complementary to that of the peripheral wall 22b of the second end 22 makes it possible to obtain the same effect.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Transportation (AREA)
• Braking Arrangements (AREA)
• Transmission Devices (AREA)
• Braking Systems And Boosters (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=82482996

Family Applications (1)

Country Status (5)

Family Cites Families (3)

• 2022
  • 2022-06-06 FR FR2205410A patent/FR3136267B1/fr active Active
• 2023
  • 2023-05-25 WO PCT/EP2023/064087 patent/WO2023237348A1/fr not_active Ceased
  • 2023-05-25 EP EP23729708.0A patent/EP4536520A1/de active Pending
  • 2023-05-25 CN CN202380041719.7A patent/CN119365374A/zh active Pending
  • 2023-05-25 JP JP2024571298A patent/JP2025518332A/ja active Pending

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