Braking device with movable pusher head for caliper brake, comprising one or more flat return springs

Abstract

The invention relates to a braking device (5) for a caliper brake, comprising a pusher head (33) cooperating with a piston (7) by means of elastic members (31) in order to selectively transmit axial forces to the piston (7) during braking. Also disclosed are a floating caliper brake comprising at least one such device (5) and a corresponding assembly method.

Description

Movable push-head braking device for caliper brakes, comprising one or more return blades

[0001] The invention relates to the field of caliper brakes, in particular floating caliper brakes for motor vehicles.

[0002] The invention is of particular interest for electrically operated brakes, especially fully electrically operated brakes, also called electro-mechanical brakes (“Electro-Mechanical Brake (EMB)” in English). State of the art

[0003] Floating caliper brakes known in the prior art include one or more pistons allowing a braking force to be exerted on a wheel disc via pads or shoes.

[0004] In operation, such a brake is subjected to significant mechanical and thermal stresses, which require a robust drive mechanism capable of withstanding, in particular, multidirectional braking counter-forces.

[0005] The invention aims to improve prior art caliper brakes, including those with hydraulic and / or electromechanical actuation.

[0006] To this end, the invention relates to a braking device, or clamping device, for a caliper brake, having a longitudinal axis and comprising: a piston intended to be moved in translation along the longitudinal axis relative to a body of the caliper, a push head connected to the piston so as to allow displacements of the push head relative to the piston in a transverse direction, one or more elastic elements each having a first end cooperating with the piston and a second end cooperating with the push head so as to allow and / or dampen displacements of the push head in the transverse direction around an equilibrium position relative to the piston and to return the push head to the equilibrium position.

[0007] The said transverse direction is preferably perpendicular to the said longitudinal axis.

[0008] In one embodiment, one or more of said elastic organs form or comprise one or more plates or blades.

[0009] These blades or plates can typically be configured to work in bending and / or shear during displacements of the thrust head along the transverse direction.

[0010] In one embodiment, the first end of each of said elastic members is received in a respective housing of the piston and the second end of each of said elastic members is received in a respective housing of the push head.

[0011] Without limitation, it is preferred that the device be configured so that in equilibrium position, for each of said elastic members, the housing of the piston receiving the first end of this elastic member and the housing of the push head receiving the second end of this elastic member are opposite each other.

[0012] In an embodiment in which the device comprises at least two of said elastic elements, these two elastic elements are arranged spaced apart from each other in the transverse direction.

[0013] In one embodiment, the thrust head includes a surface configured to bear against a surface of the piston in a braking situation.

[0014] In one embodiment, said piston surface and said push head surface are curved to allow the push head to slide on the piston in a ball-and-socket motion around said piston surface.

[0015] In other words, the piston and the thrust head can be configured to allow the thrust head to slide on the piston following a rotational movement around an axis parallel or oblique or perpendicular to the transverse direction.

[0016] In one embodiment, the device includes a drive mechanism comprising a first transmission member and a second transmission member which cooperate with each other to transform a rotational movement about said longitudinal axis of said first member into a translational movement along the longitudinal axis of said second member.

[0017] One of the said first organ and the said second organ may include a screw, the other of the said first organ and the said second organ may include a nut.

[0018] The said second component may form the piston or be integral with the piston in translation along the longitudinal axis.

[0019] In one embodiment, the device includes a retaining member configured to secure or retain the piston with the thrust head in translation along the longitudinal axis and / or in rotation around the longitudinal axis.

[0020] In one embodiment, the retaining member forms an annular member having, radially inwards, one or more elements such as one or more tabs cooperating with the piston and, radially outwards, one or more elements such as a skirt cooperating with the push head.

[0021] Without limitation, said skirt may be crimped into a peripheral groove of the push head.

[0022] In one embodiment, the device includes an assembly member, such as a pin or a dowel, configured to fix the retaining member to the push head and / or to secure the retaining member and the push head in rotation around the longitudinal axis.

[0023] In one embodiment, said assembly member is received in a hole in the push head.

[0024] Such a hole may be off-center and / or formed on the surface of the thrust head and / or extend parallel to said longitudinal axis.

[0025] In one embodiment, said assembly member is configured to cooperate with a groove or channel of said first member of the drive mechanism so as to define and / or limit a rotational displacement stroke around the longitudinal axis of the first member of the drive mechanism relative to the thrust head.

[0026] The said throat of the said first organ may be in an arc of a circle and may present an increasing depth.

[0027] The invention also relates to a caliper brake comprising at least one braking device as defined above, for example two braking devices.

[0028] In one embodiment, the brake is a floating or sliding caliper brake.

[0029] Preferably, the brake includes at least one electric actuator.

[0030] According to another aspect, the invention also relates to a method of mounting a braking device as defined above.

[0031] The method preferably includes a connection of said first end of the elastic element(s) with the piston and a connection of said second end of the elastic element(s) with the thrust head so as to allow and / or dampen displacements of the thrust head along said transverse direction around an equilibrium position relative to the piston and to return the thrust head to the equilibrium position.

[0032] Among other advantages, the invention makes it possible to increase the robustness of the piston drive mechanism and to facilitate the assembly of the brake and its mass production.

[0033] Among other advantages, the invention makes it possible to separate, during braking, axial forces, which act perpendicular to the plane of a brake disc, from transverse forces, which act parallel to the plane of this disc. These transverse forces include tangential forces resulting from the drive of friction elements by the rotation of the disc, as well as radial and rotational forces on the friction elements, which may result from stress deformation of the caliper. The invention thus makes it possible to separate such forces acting on the push head, so as to selectively transmit axial forces to the piston drive mechanism, for example, to a shaft in a ball screw system, or to the component interfacing with an internal friction element such as a ball screw.The link between the piston and the thrust head provides the latter with kinematic freedom which makes it possible to eliminate, or at least reduce, the transverse forces applied to such a piston, that is to say, forces having at least one component perpendicular to the longitudinal axis.

[0034] Thus, the invention avoids transmitting these transverse forces to mechanical elements whose operation and / or lifespan could be affected by such transverse forces, these mechanical elements potentially including a ball screw. Advantageously, the transmission of transverse forces to such mechanical elements can be limited to the elastic stresses of a transverse return element, advantageously tangential, which returns the friction elements to an equilibrium position, typically along the axis of the piston(s).

[0035] According to the invention, the decoupling of the transverse forces exerted on the friction elements until these forces are taken up by the yoke or by a guide spring associated with said yoke, of the residual transverse forces transmitted to the axial thrust mechanism, improves the safety of the brake by increasing the number of possible braking cycles during the operating time of the brake and reduces the operating noise of the brake.

[0036] The invention more generally makes it possible to reduce the size and mass of the brake, in particular by transmitting the forces directly to a force sensor housed in the caliper.

[0037] The invention also makes it easier to assemble the brake and to mass-produce it.

[0038] The invention as defined in the claims can be implemented in braking devices and / or in brakes as described in the French patent applications filed on July 19, 2023 under numbers FR2307735 and FR2307736, the French patent application filed on February 23, 2024 under number FR2401802, the French patent application filed on March 15, 2024 under number FR2402613 and the French patent application filed on March 31, 2024 under number FR2405686, the content of these applications being incorporated in this document.

[0039] Other advantages and features of the invention will become apparent from the detailed, non-limiting description that follows. Brief description of the figures

[0040] The detailed description that follows refers to the accompanying drawings in which: a is a perspective view of a floating caliper brake according to the invention; a is a perspective view of part of a braking device according to the invention, the device comprising a push head, a piston and a piston drive mechanism; a is a perspective view of a subassembly of the device, this subassembly comprising the push head, a retaining plate, a pin and elastic blades; a is a perspective view of a subassembly of the device, this subassembly comprising said elastic blades as well as a component forming a drive screw and piston; a is a top view of a subassembly of the device, this subassembly comprising said retaining plate and the component forming the screw and piston;Figure 1 is a schematic axial cross-sectional view of a part of the device, showing the push head, the piston and one of the elastic blades, the push head being in an equilibrium position relative to the piston; Figure 2 is a schematic axial cross-sectional view of the part of the device, the push head being offset relative to the piston transversely in a first direction; Figure 3 is a schematic axial cross-sectional view of the part of the device, the push head being offset relative to the piston transversely in a second direction; Figure 4 is a perspective view of the push head of the device; Figure 5 is a perspective view of the retaining plate of the device; Figure 6 is a perspective view of a part of a braking device according to the invention, similar to that of Figure 7, showing the piston and grooves formed by a nut of the drive mechanism;laest an axial cross-section of a braking device according to the invention, similar to that of the, showing the pin whose head is received in a groove of the drive mechanism.;

[0041] Common references are used across the different figures to designate identical or similar elements. Detailed description of implementation methods

[0042] Figures 1 to 12 include a reference frame defining orthogonal directions D1, D2 and D3.

[0043] It is represented at a brake 1 according to the invention.

[0044] Without limitation, brake 1 is a floating caliper brake intended to be connected to a wheel (not shown) of a motor vehicle (not shown) having an axis of rotation parallel to the direction D1.

[0045] The brake caliper 1 in this example comprises a solid cast iron body 2 forming bores 3 (only one bore 3 being visible at the) intended to receive columns (not shown) in order to be able to move the caliper relative to a fixed structure (also called clevis, not shown) of the vehicle, in translation along the direction D1.

[0046] The brake 1 comprises two sub-assemblies 5, also called "braking devices" or "clamping devices", which are housed in cavities formed by the body 2 of the caliper.

[0047] In this non-limiting example, each of the subassemblies 5 of the brake 1 of the includes a braking device similar to that described below with reference to Figures 2 to 12, comprising a piston 7 and a piston 7 drive mechanism 8.

[0048] In a manner known per se, the brake 1 of the is intended to move pads (not shown) against a disc (not shown) of the wheel, by translation of the pistons of the subassemblies 5 in a direction S1 along the direction D1, relative to the body 2 of the caliper, and by translation of the caliper, via the columns, relative to said fixed structure of the vehicle in a direction S2 opposite to the direction S1, so as to exert a braking force on the disc.

[0049] The braking device 5 of the embodiment shown in Figures 2 to 12 will now be described.

[0050] In this embodiment, the device 5 comprises, in a non-limiting and non-exhaustive manner, the following components: said piston 7 (see figures 4 to 8 and 11), a shaft / screw 23 and a nut 24 forming a ball screw system with ball recirculation which forms said drive mechanism 8 (see figures 2, 4, 5, 11 and 12), two elastic elements 31 in the form of blades (see figures 3, 4 and 6 to 8), a retaining member 32 or retaining plate (see figures 3, 5 and 10), a push head 33 (see figures 2, 3, 6 to 9 and 12), a sealing ring 34 (see), a pin 35 (see figures 3 and 12).

[0051] Lamontre shows device 5 in an assembled configuration, in which it presents a longitudinal axis A1 around which its components extend. In this example, axis A1 is parallel to direction D1.

[0052] In the non-limiting example of the, the screw 23 of the drive mechanism 8 and the piston 7 form a single, monobloc component, which extends along the axis A1.

[0053] This component includes a threaded part forming the screw 23 and a head forming the piston 7. The threaded part extends from a first axial end of this component (towards the bottom of the) to said head which defines a second axial end of this component (towards the top of the).

[0054] With reference to figures 4 and 5, the piston 7 in this example has a lateral surface 109 giving the piston 7 an overall rectangular cross-section, as well as a surface 110 which extends overall along the directions D2 and D3 and which constitutes an axial end surface of the component forming the piston 7 and the screw 23.

[0055] In this example, surface 110 is curved along the direction D3.

[0056] The piston 7 includes two cavities 111, visible in the figure, which in this example appear as grooves extending each along the direction D3 and which are spaced from each other along the direction D2.

[0057] The cavities 111 each open onto the surface 110 of the piston 7.

[0058] With reference to figures 3 and 4, each of the elastic elements 31 is in this example a blade which can typically be made from a metal plate.

[0059] As an example, the blades 31 may include spring steel, for example, but not limited to, stainless steel.

[0060] More specifically, each of the blades 31 is, at rest, in the form of a plate extending along the direction D1, defining a first axial end visible at the and a second axial end visible at the.

[0061] With reference to figures 5 and 10, the retaining element 32 has an overall annular geometry, extending around the axis A1.

[0062] In this example, the organ 32 is made from a metal plate shaped to present a main part, also called the body, which extends parallel to the directions D2 and D3.

[0063] Organ 32 forms, radially inwards, four tongues 77 connected to the body while being circumferentially spaced from each other.

[0064] Radially outwards, the organ 32 forms an annular element 78 extending along the body, axially towards the thrust head 33 (see). Its axial portion thus forms a skirt in one or more parts which is crimped around the periphery of the thrust head 33, to retain it along axis A1.

[0065] The body of the retaining member 32 includes an orifice 79 which passes axially through it from one end to the other (see figures 5 and 10).

[0066] With reference to figures 2, 3 and 9, the thrust head 33 is in the form of a disk having a surface 90 which extends along a fictitious plane parallel to the directions D2 and D3 and which constitutes an end surface of the device 5.

[0067] Axially opposite surface 90, i.e. on the side of piston 7, the head 33 forms a surface 81.

[0068] In this example, the surface 81 is curved along the direction D3 (see).

[0069] The head 33 includes two cavities 87 which are in the form of grooves extending each along the direction D3 and which are spaced from each other along the direction D2.

[0070] The cavities 87 each open onto the surface 81 of the thrust head 33.

[0071] As an indication, the thrust head 33 in this example comprises a nitrided steel of type "32CDV13" according to the AFNOR standard and is designed to have a mechanical resistance greater than or equal to 1150 MPa and a hardness greater than or equal to 600 HV.

[0072] In this example, the piston 7 comprises the same material as the thrust head 33.

[0073] The assembly of the various components mentioned above will now be described.

[0074] With reference to the, the retaining member 32 is assembled with the push head 33 by inserting the annular element 78 of the member 32 into an annular groove of the push head 33.

[0075] This operation is carried out here by crimping, deforming the organ 32 and in particular the element 78 in relation to the body of the organ 32.

[0076] Thus assembled, the retaining member 32 and the thrust head 33 are fixed together in translation along the direction D1.

[0077] In this example, the pin 35 is inserted into a hole 80 in the push head 33 (see), through the orifice 79 of the organ 32.

[0078] The pin 35 allows in particular to secure the organ 32 and the head 33 in rotation around the axis A1.

[0079] With reference to the, the organ 32 is also connected to the piston 7 by making the tabs 77 of the organ 32 cooperate with notches (not shown) formed on the lateral surface 109 of the piston 7, so as to secure the organ 32 and the piston 7 in rotation around the axis A1.

[0080] In this example, the said notches of the piston 7 form an axial stop surface configured to limit a displacement of the member 32 relative to the piston 7 in translation along the axis A1 in a direction going from said first axial end of the component forming the screw 23 and the piston 7 to said second axial end of this component.

[0081] The assembly of the member 32 with the piston 7 can be achieved by placing the member 32 on the piston 7 in an initial configuration not shown in which the member 32 is in an angular position offset by 90° with respect to the angular position illustrated in the figure, then by rotating the member 32 a quarter turn around the axis A1 with respect to the piston 7, causing an elastic deformation of the tabs 77, until the configuration of the figure.

[0082] The component 32 thus makes it possible to connect the piston 7 and the thrust head 33 in such a way as to secure these parts on the one hand in rotation around the axis A1 and, on the other hand, in translation along this axis A1, or at least in such a way as to limit their relative displacement in one or more corresponding directions.

[0083] In this example, the retaining member 32 can first be connected to the piston 7 to form a sub-assembly which can then be assembled with the push head 33.

[0084] More specifically, in this non-limiting example, the aforementioned subassembly comprises, on the one hand, the retaining member 32 and the piston 7, which are arranged according to the configuration illustrated in Figure 1, and on the other hand, the blades 31, which are connected to the piston 7 by inserting their first end into one of the respective cavities 111 of the piston 7, according to the configuration illustrated in Figure 1. This subassembly is then connected to the thrust head 33, by making the member 32 and the head 33 cooperate in the manner described above, so that the second end of the blades 31 enters one of the respective cavities 87 of the thrust head 33.

[0085] In the assembled configuration, the surface 110 of the piston 7 is in contact, or at least opposite, the surface 81 of the thrust head 33.

[0086] In this example, the tabs 77 of the member 32 are provided to cooperate with said notches of the piston 7 so as to maintain the surface 110 of the piston 7 against the surface 81 of the thrust head 33.

[0087] The curvature of these surfaces 81 and 110 allows, during braking, a sliding motion of the push head 33 on the piston 7, following a rotational movement around a fictitious axis (not shown) parallel to the direction D2. To allow such movement, a clearance can typically be provided between the blades 31 and the cavities 87. In other words, the push head 33 is, in this example, mounted to move via a floating pivot or ball joint relative to the piston 7.

[0088] In the assembled configuration, the blades 31 exert a mutual force on the piston 7 and the thrust head 33, tending to return the thrust head 33 towards a position centered on the axis A1, also called the "equilibrium position", while allowing a transverse displacement of the thrust head 33 relative to the piston 7, in this example in translation along the direction D2.

[0089] More specifically, when the thrust head 33 is driven along the direction D2 from the equilibrium position illustrated in the to the position shown in the, the blades 31 deform, thus allowing a displacement along D2 of the thrust head 33 relative to the piston 7 and, consequently, exerting on the thrust head 33 a restoring force in a first direction along the direction D2.

[0090] When the thrust head 33 is driven along the direction D2 from the equilibrium position illustrated in the to the position shown in the, the blades 31 deform, thus allowing a displacement along D2 of the thrust head 33 relative to the piston 7 and, consequently, exerting on the thrust head 33 a restoring force in a second direction along the direction D2, the second direction being opposite to the first direction.

[0091] The blades 31 thus make it possible to dampen displacements of the push head 33 along the direction D2 around the equilibrium position relative to the piston 7 and, in particular at the end of the braking phase, to return the push head 33 to the equilibrium position.

[0092] The 31 blades thus form reminder elements.

[0093] With reference to figures 1 and 2, the sealing ring 34 in this example conventionally comprises a bellows-folded structure connected to the thrust head 33 and configured to cooperate with an annular surface of the body 2 which delimits an axial end of a cavity of the body 2 receiving the device 5, the device 5 passing through the body 2 in the direction D1.

[0094] With reference to the, the mechanism 8 is in this example configured to transform a rotation of the nut 24 around the axis A1 into a translation of the screw 23, and consequently of the piston 7 and the push head 33, along the axis A1.

[0095] To do this, the nut 24 can be driven in rotation around the axis A1 by a transmission element (not shown) which may include one or more toothed wheels.

[0096] In the particular example where the brake 1 comprises two braking devices 5 such as that described above, the transmission element can typically include a toothed wheel (not shown) passing through a lateral opening 152 in the body 2 so as to simultaneously drive the shafts 23 of the two devices 5 around the corresponding axis A1. Such a toothed wheel can be driven, for example via a transmission (not shown), by an electric motor (not shown).

[0097] Furthermore, the nut 24 of the drive mechanism 8 in this example comprises two grooves 100 of increasing depth, one of these grooves 100 receiving the head of the pin 35 when the nut 24 is in contact with the thrust head 33 or approaching it (see Figures 3, 11 and 12). Each of these grooves 100 extends circumferentially around the axis A1, in an arc, in order to allow and / or limit a displacement of the head of the pin 35 in this groove 100 during a rotational movement of the nut 24 around the axis A1 relative to the subassembly formed by the screw 23, the piston 7, the return blades 31, the retaining member 32, the thrust head 33 and the pin 35.The grooves 100 of the nut 24 each have circumferential ends that form circumferential stops with respect to the head of the pin 35, thus defining an angular stroke, that is, a rotational displacement around the axis A1 of the nut 24 relative to the aforementioned subassembly. The presence of a single pin 35 advantageously maximizes this stroke, which can be close to 360° – in this example, the stroke is close to 180° – and reduces the contact pressure.

[0098] Without limitation, brake 1 of the can be used as a service brake.

[0099] In operation, for each of the brake 1 devices 5, the piston 7 and the push head 33 are moved from a rest configuration, as illustrated in the figure, to a deployed configuration (not shown) until the brake pads come into contact with the disc and then a braking force is applied.

[0100] In this example and purely for illustrative purposes, each of the devices 5 is configured so that an input torque of approximately 33 Nm applied to the shaft 23 can produce a braking force of approximately 35 kN on the disc and, in reaction, a counter-braking force on a sensor (not shown) associated with this device 5.

[0101] During braking, the rotation of the disc exerts transverse forces on the brake pad, which are largely absorbed by the yoke (the fixed part of the brake, not shown). Due to play between the pad and the yoke, small transverse displacements of the pad remain, producing transverse forces on the push head 33 over a short stroke, particularly in the D2 direction. This results in a translation of the surface 81 of the push head 33 in the D2 direction and then, during a phase of increasing force, a pivoting of the surface 81 of the push head 33 on the surface 110 of the piston 7. The deformation of the return elements 31 allows these transverse displacements without transmitting them to the piston 7, thus decoupling the axial and transverse forces from the piston's perspective.

[0102] In this example, said sensor of each of the devices 5 is connected to a computer (not shown) in order to transmit to it information, in the form of electrical signals, relating to the axial forces applied to the sensors.

[0103] In this example, the computer is configured to control the electric motor and thus adapt the axial braking force, and / or one or more other parameters such as torque or deceleration, according to this information and taking into account a braking instruction.

[0104] At the end of braking, each of the devices 5 of brake 1 is returned to the rest configuration by reversing the direction of rotation of the motor.

[0105] Such a brake 1 can also be used analogously as a parking brake. The invention can also be implemented in a brake comprising a hydraulic part and an electromechanical part, these parts typically being designed to perform, respectively, a service brake function and a parking brake function.

[0106] The preceding description is by no means exhaustive. Among other variations, the braking device 5 described above may have a different architecture and / or parts that are arranged differently and / or that have different geometric and / or dimensional and / or material characteristics.

[0107] In particular, the braking device may include a single return element or more than two return elements, that is to say more generally a chosen number of return elements which may also have a geometry different from that of the blades 31 illustrated in figures 3, 4 and 6 to 8.

[0108] In alternative embodiments, not shown, the surface 110 of the piston 7 and the surface 81 of the thrust head 33 are flat or have a geometry different from that illustrated in figures 3 and 4, for example a spherical geometry.

[0109] For another example of an alternative embodiment, not shown, the drive screw 23 and the piston 7 can be two separate parts assembled together.

[0110] In one embodiment, the push head 33 comprises a silicone or rubber material of the "EPDM" type (for "ethylene-propylene-diene monomer"), such a material being able to also be used to form one or more of the elastic return members.

[0111] In an unshown variant, the piston 7 drive mechanism can be replaced by a different drive mechanism, including a conventional one, with or without a ball screw system.

[0112] The drive can also be achieved by means other than a toothed wheel. For example, in an embodiment not shown, the brake can include a drive element forming a bevel gear with the drive mechanism 8, or a worm gear.

[0113] The braking device of the invention can be configured to produce a clamping force different from that indicated above, for example a maximum braking force of 25 kN, or 35 kN, or 45 kN, or even 65 kN.

[0114] As an indication, the said transverse force recovery device can typically recover transverse forces of 122.4 N, or 176.9 N, or 130.9 N, or even 231.5 N, depending in particular on the brake configuration.

[0115] The transmission of axial forces to the sensor, from piston 7, can be achieved through one or more parts, including for example a washer and / or a stop.

[0116] In an alternative embodiment, not shown, the device may include a piston guide element 7, which may for example form a sealing joint.

[0117] The different embodiments described above can be applied to each of the sub-assemblies 5 of the brake 1 of the or to only one of these sub-assemblies 5 or to a brake comprising a single braking device according to the invention.

[0118] More generally, the invention also covers a brake comprising at least one braking device 5 according to the invention. Thus, it is entirely applicable to a single-piston brake, therefore with a single braking device 5, in service brake (EMB) and / or parking brake (EPB) mode.

[0119] Compared to a brake with a single braking device according to the invention, a brake with two braking devices according to the invention typically reduces the forces, particularly transverse forces, applied to each of these devices and, consequently, allows them to support greater forces together.

[0120] In the embodiment of the, the caliper body 2 is monobloc and each of the sub-assemblies 5 can be pre-assembled, at least partially, and then inserted into the corresponding cavity of the body 2 by passing it through the space intended to receive the disc and the pads.

[0121] In one embodiment, the caliper body 2 is a composite piece, in several parts. In such an embodiment, a braking device 5 according to the invention can be inserted, partially or totally pre-assembled, into a cavity in the caliper body from either end of the cavity, depending on the geometry of the caliper, the braking device and the method of assembling the body.

[0122] The invention also covers a fixed caliper brake receiving one or more braking devices, in a manner analogous to the brake of the.

[0123] In one embodiment, not shown, the brake includes a high-efficiency reversible transmission geared motor, associated with a brake parking locking mechanism in a braking position.

[0124] List of reference numbers: 1: Caliper brake 2: Caliper body 3: Bore for guide pin 5: Braking device 7: Piston 8: Drive mechanism 23: Drive mechanism shaft / screw 24: Drive mechanism nut 31: Components / elements / spring / return blades 32: Retaining component / plate 33: Push head 34: Sealing ring 35: Anti-rotation pin 77: Retaining component tabs 78: Retaining component connecting element 79: Retaining component orifice for anti-rotation pin 80: Push head hole for anti-rotation pin housing 81, 90: Push head surface 87: Push head cavity 109, 110: Piston surface 100: Drive nut groove 111: Piston cavity for spring return blade 152: Caliper body opening A1: Longitudinal axis D1: Axial / longitudinal direction (reference frame) D2, D3: Transverse direction (reference frame) S1, S2: Direction of movement

Claims

Braking device (5) for caliper brake (1), having a longitudinal axis (A1) and comprising: a piston (7) intended to be moved in translation along the longitudinal axis (A1) relative to a body (2) of the caliper, a push head (33) connected to the piston (7) so as to allow displacements of the push head (33) relative to the piston (7) in a transverse direction (D2), one or more elastic elements (31) each having a first end cooperating with the piston (7) and a second end cooperating with the push head (33) so as to allow and / or dampen displacements of the push head (33) in the transverse direction (D2) around an equilibrium position relative to the piston (7) and to return the push head (33) to the equilibrium position. Device (5) according to claim 1, wherein one or more of said elastic members (31) form or comprise one or more plates or blades. Device (5) according to claim 1 or 2, wherein the first end of each of said elastic members (31) is received in a respective housing (111) of the piston (7) and the second end of each of said elastic members (31) is received in a respective housing (87) of the push head (33), the device (5) preferably being configured so that in equilibrium position, for each of said elastic members (31), the housing (111) of the piston (7) receiving the first end of this elastic member (31) and the housing (87) of the push head (33) receiving the second end of this elastic member (31) are opposite each other. Device (5) according to any one of claims 1 to 3, in which at least two of said elastic members (31) are arranged spaced apart from each other along the transverse direction (D2). Device (5) according to any one of claims 1 to 4, wherein the push head (33) comprises a surface (81) configured to bear against a surface (110) of the piston (7) in a braking situation, said surface (110) of the piston (7) and said surface (81) of the push head (33) preferably being curved to allow the push head (33) to slide on the piston (7) following a ball-joint movement around said surface (110) of the piston (7). Device (5) according to any one of claims 1 to 5, comprising a drive mechanism (8) including a first transmission member (24) and a second transmission member (23) which cooperate with each other to transform a rotational movement about said longitudinal axis (A1) of said first member (24) into a translational movement along the longitudinal axis (A1) of said second member (23), one of said first member and said second member comprising a screw (23), the other of said first member and said second member comprising a nut (24), said second member (23) forming the piston (7) or being integral with the piston (7) in translation along the longitudinal axis (A1). Device (5) according to any one of claims 1 to 6, comprising a retaining member (32) configured to secure or retain the piston (7) with the thrust head (33) in translation along the longitudinal axis (A1) and / or in rotation about the longitudinal axis (A1), the retaining member (32) preferably forming an annular member having, radially inwards, one or more elements such as one or more tabs (77) cooperating with the piston (7) and, radially outwards, one or more elements (78) such as a skirt cooperating with the thrust head (33), for example a skirt crimped into a peripheral groove of the thrust head (33). Device (5) according to claim 7, comprising an assembly member, such as a pin or a dowel (35), configured to fix the retaining member (32) to the push head (33) and / or to secure the retaining member (32) and the push head (33) in rotation about the longitudinal axis (A1), said assembly member (35) preferably being received in a hole (80) offset on the surface of the push head (33) and extending parallel to said longitudinal axis (A1). Device (5) according to claims 6 and 8, wherein said assembly member (35) is configured to cooperate with a groove (100) of said first member (24) of the drive mechanism (8), the groove (100) preferably being in the shape of an arc of a circle and being able to have an increasing depth, so as to define and / or limit a rotational displacement stroke around the longitudinal axis (A1) of the first member (24) of the drive mechanism (8) relative to the push head (33). Caliper brake (1), preferably floating or sliding, comprising at least one, for example two, braking device(s) (5) according to any one of claims 1 to 9. Method of mounting a braking device according to any one of claims 1 to 9, comprising a connection of said first end of the elastic element(s) (31) with the piston (7) and a connection of said second end of the elastic element(s) (31) with the push head (33) so as to allow and / or dampen displacements of the push head (33) along said transverse direction (D2) around an equilibrium position relative to the piston (7) and to return the push head (33) to the equilibrium position.

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