Center Collar Ball Screw Nut for Caliper Brake

Abstract

Braking device (5) for a caliper brake, comprising a ball screw drive mechanism provided with a nut (24) which has a central collar (404) for transmitting axial forces. Floating caliper brake equipped with such a device (5). Figure for the abstract: Fig. 2

Description

Title of the invention: Ball screw nut with central collar for caliper brake Technical field

[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 actuated brakes, in particular fully electric brakes, also called electromechanical brakes (“Electro-Mechanical Brake (EMB)” in English). State of the art

[0003] Floating caliper brakes known in the prior art comprise one or more pistons for exerting a braking force on a disc of a wheel via pads.

[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. Statement of the invention

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

[0006] To this end, the invention relates to a nut for a ball screw drive mechanism intended to move a caliper brake piston, the nut comprising a body extending around a longitudinal axis and comprising, successively along the longitudinal axis: - a first section intended to receive an axial force transmission member, - a collar configured to be able to come into contact with said member of transmission in order to transmit an axial force to a body of the caliper via this transmission member, - a second section intended to receive a member for guiding the nut in rotation around the longitudinal axis.

[0007] In one embodiment, the first section has a first length along the longitudinal axis and the second section has a second length along the longitudinal axis, the ratio between the first length and the second length being between 0.1 and 2.0, preferably between 0.2 and 1.9, more preferably between 0.7 and 1.3, for example equal to 1.0.

[0008] In one embodiment, one of the first section and the second section is configured to cooperate with a member for driving the nut in rotation. around the longitudinal axis.

[0009] In the context of this embodiment, the section which is configured to cooperate with such a drive member may comprise a polygonal or toothed surface or any other geometry, this surface being configured to cooperate with said drive member by shape complementarity.

[0010] In one embodiment, the nut comprises a cage disposed in an opening of the nut body.

[0011] Preferably, the cage comprises an inner path configured to form with an outer path of said ball screw a rolling groove for the balls.

[0012] In one embodiment, the body of the nut forms a ball recirculation channel.

[0013] The invention also relates to a braking device for a caliper brake.

[0014] The device preferably comprises a piston and a piston drive mechanism configured to move the piston in translation along a longitudinal axis relative to a body of the caliper.

[0015] The drive mechanism preferably comprises a ball screw and a nut as defined above.

[0016] In one embodiment, the device comprises an axial force transmission member mounted on said first section of the nut and configured to be interposed axially between said collar and a body of the caliper in order to allow the nut to transmit an axial force to the body of the caliper via this transmission member.

[0017] In a non-limiting manner, said axial force transmission member may comprise a roller thrust bearing.

[0018] In one embodiment, the device comprises a guide member mounted on said second section of the nut and configured to extend radially between said second section of the nut and said body of the stirrup in order to ensure guidance of the nut in rotation around the longitudinal axis.

[0019] In a non-limiting manner, said guide member comprises a ball bearing.

[0020] In one embodiment, the device comprises a force sensor configured to measure an axial force transmitted to said body of the caliper by said collar.

[0021] In one embodiment, the nut comprises a ball recirculation channel, at least one orifice and at least one so-called recirculation part which is housed in the at least one orifice.

[0022] Preferably, the at least one recirculation part is configured to guide the balls in a circuit formed by the recirculation channel.

[0023] Said guide member can advantageously be configured to maintain the at least one recirculation part in the at least one orifice.

[0024] In one embodiment, the device comprises a thrust head connected to the screw so as to allow movements of the thrust head relative to the screw in a transverse direction.

[0025] In one embodiment, the device comprises one or more elastic members extending radially between, on the one hand, the thrust head and, on the other hand, the screw and / or an interface part connected to the screw, so as to allow and / or dampen movements of the thrust head in the transverse direction around an equilibrium position relative to the screw and to return the thrust head to the equilibrium position.

[0026] In a non-limiting manner, said elastic members may comprise spiral springs or compression springs.

[0027] The invention also relates to a caliper brake comprising at least one such braking device.

[0028] The brake may in particular be a floating caliper brake.

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

[0030] Among other advantages, the invention makes it possible to improve the rigidity of the nut and the robustness of the piston drive mechanism, while optimizing the size of the device.

[0031] Advantageously, the collar can be in a central zone of the nut, along the longitudinal axis, so as to optimize the recirculation of the balls.

[0032] Furthermore, the nut according to the invention makes it possible to reduce the number of parts of the ball screw.

[0033] 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 the numbers FR2307735 and FR2307736 and / or as described in the French patent application filed on February 23, 2024 under the number FR2401802, the content of these applications being incorporated into this document.

[0034] Other advantages and characteristics of the invention will appear on reading the detailed, non-limiting description which follows. Brief description of the figures

[0035] The following detailed description refers to the accompanying drawings in which: - [Fig. 1] is a sectional view of a part of a caliper brake comprising a so-called braking device according to a first embodiment; - [Fig.2] is a sectional view of part of the braking device of [Fig.l]; - [Fig.3] is a perspective and exploded view of part of a device braking according to a second embodiment; - [Fig.4] is a side view of part of the braking device of [Fig.3]; - [Fig.5] is a sectional view of part of the braking device of [Fig.3].

[0036] Common references are used in the various figures to designate identical or similar elements. Detailed description of embodiments

[0037] Figures 1 to 5 include a reference frame defining orthogonal directions D1, D2 and D3.

[0038] [Fig.l] shows a part of a brake 1 according to the invention.

[0039] In a non-limiting manner, the 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 Dl.

[0040] The brake caliper 1 comprises in this example a solid cast iron body 2 forming bores (not shown) intended to receive columns (not shown) in order to be able to move the caliper relative to a fixed structure (not shown) of the vehicle, in translation in the direction DL

[0041] The brake 1 of [Fig.l] comprises a subassembly 5, also called a “braking device”, which is housed in a cavity formed by the body 2 of the caliper.

[0042] The braking device 5 comprises in particular a piston 7 and a drive mechanism for the piston 7, which are described further below.

[0043] In a manner known per se, the brake 1 of [Fig. 1] is designed to move pads (not shown) against a disc (not shown) of the wheel, by translation of the piston 7 in a direction SI 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 SI, so as to exert a braking force on the disc.

[0044] The braking device 5 of the brake 1 will now be described with reference to FIGS. 1 and 2.

[0045] In the embodiment of Figures 1 and 2, the braking device 5 comprises: - a shaft 23, an interface piece 300 and a thrust head 33 forming said piston 7 which extends along a longitudinal axis A1, the axis A1 being in this example parallel to the direction D1, - a nut 24 forming with the shaft 23 a ball screw drive mechanism, said screw of this mechanism being formed by the shaft 23, - spiral springs 31, - a retaining plate 32, a sealing ring 34 (see [Fig.l]), an elastic ring 200, a washer 210, a roller thrust bearing 212, a ball bearing 214, an elastic washer 216, a ring 218, a bushing 302, a force sensor 304 (see [Fig.l]), a stop ring 306.

[0046] In the non-limiting example of [Fig. 1], the brake 1 comprises an actuator comprising an electric motor 310, as well as a mechanism 312 configured to transmit a rotation of a shaft of the motor 310 to the nut 24 of the drive mechanism of the braking device 5.

[0047] The mechanism 312 comprises in this example toothed wheels 320 and 322, an epicyclic gear train comprising an inner sun gear 330, a crown 332 forming an outer sun gear and satellites 334, as well as a bell 340 carrying the satellites 334.

[0048] Such a mechanism 312, which can of course be different from that of [Fig.l], makes it possible to drive the bell 340 in rotation around the axis A1 under the action of a rotation of the shaft of the motor 310.

[0049] In this example, the bell 340 has a radially internal surface 342 of polygonal shape, in this case dodecagonal, which is provided to cooperate with a complementary surface formed by the nut 24 (see further below), in order to drive the latter in rotation around the axis A1 when the bell 340 is driven in rotation by the actuator 310.

[0050] Referring to [Fig.2], the nut 24 of the ball screw drive mechanism comprises a body which extends around the axis A1.

[0051] The body of the nut 24 comprises several parts or sections 402, 404 and 406 which have a longitudinal dimension, also called length, X1, X2 and X3, respectively.

[0052] The sections 402, 404 and 406 follow one another longitudinally, that is to say along the axis AL

[0053] The radial dimension of the section 404 is greater than the radial dimension of each of the sections 402 and 406, the section 404 thus forming a collar.

[0054] In this non-limiting example, the ratio between the lengths XI and X3 is of the order of 1.5.

[0055] Longitudinally, the collar 404 is thus positioned in a central zone of the body of nut 24, which improves the rigidity of nut 24.

[0056] In this example, the section 402 forms on the one hand, at a longitudinal end opposite the collar 404, a radially external surface 410 defining a polygonal section, in this case dodecagonal, which extends over a first longitudinal portion of the section 402. The section 402 forms a radially external surface 412 which is cylindrical and which extends over a second longitudinal portion of the section 402, that is to say longitudinally between the collar 404 and said first longitudinal portion of the section 402. The surface 412 has a diameter greater than that of a circle in which the surface 410 is inscribed.

[0057] In this example, the section 404 has a radially external surface 414 which is cylindrical and which has a diameter close to, but greater than, that of the surface 412.

[0058] The collar 404 defines annular surfaces 420 and 422, longitudinally on either side of the collar 404.

[0059] Thus, the surface 420 of the collar 404 extends in line with the surface 412 of the section 402, while the surface 422 of the collar 404 extends in line with the surface 414 of the section 406.

[0060] The components of the braking device 5 are assembled together in the manner described below and as illustrated in Figures 1 and 2.

[0061] In the assembled configuration of Figures 1 and 2, the screw 23, the nut 24 and the balls (not shown) of the drive mechanism are arranged in a manner known per se so that a rotation of the nut 24 around the axis A1 causes a translation of the screw 23 along this axis A1.

[0062] With reference to figures 1 and 2, the bearing 214 comprises on the one hand an internal ring mounted on the surface 414 of the section 406 of the nut 24 and being in axial support on the surface 422 of the collar 404 of the nut 24 and, on the other hand, an external ring secured to the body 2 of the caliper.

[0063] The bearing 214 thus extends radially between the section 406 of the nut 24 and the body 2 of the caliper in order to ensure guidance of the nut 24 in rotation around the axis A1, relative to the body 2 of the caliper.

[0064] The section 402 of the nut 24 receives the sleeve 302, which is arranged on the surface 412, as well as the stop 212, the washer 210 and the sensor 304 which extend radially around the sleeve 302 and which are stacked axially between the collar 404 of the nut 24 and a shoulder of the body 2 of the caliper (see [Fig.l]).

[0065] In the example of [Fig.l], the snap ring 306 is housed in a groove of the body 2 of the caliper so as to form an axial stop for the ring 218 and the elastic washer 216, which is configured to axially press the bearing 214 onto the surface 422 of the collar 404 of the nut 24 and, consequently, to axially press the nut 24 against the stack formed by the stop 212, the washer 210 and the sensor 304 and against said shoulder of the body 2 of the caliper.

[0066] Such an assembly makes it possible in particular to stabilize the device and its drive mechanism, in particular with regard to vibrations.

[0067] In the configuration of [Fig. 1], the surface 410 of the section 402 of the nut 24 cooperates with the surface 342 of the bell 340, by complementarity of shape, so that a rotation of the bell 340 around the axis Al causes a corresponding rotation of the nut 24 around the axis Al.

[0068] With reference to figures 1 and 2, the screw 23 comprises an end of square section housed in a cavity of square section of the interface part 300, the screw 23 and the part 300 being integral with each other in translation along the axis A1, in this example using hooping.

[0069] The interface part 300 has an axial end surface which extends generally in the directions D2 and D3 and which is configured to come into contact with an axial surface of the thrust head 33, so as to allow transverse displacement by sliding of the thrust head 33 relative to the interface part 300.

[0070] In this example, each of the springs 31 is wound in a spiral around a respective axis parallel to the axis A1 while being radially interposed between a respective notch formed by the interface part 300 and the ring 200 which matches a radially internal surface of the thrust head 33.

[0071] More precisely, a first of the springs 31 is arranged on one side of the interface part 300 in the direction D3, this first spring 31 making it possible to exert on the thrust head 33 a return force in a first direction in the direction D3. The second of the springs 31 is arranged on the other side of the interface part 300 in the direction D3, this second spring 31 making it possible to exert on the thrust head 33 a return force in a second direction in the direction D3, the second direction being opposite to the first direction.

[0072] The springs 31 are thus configured to mutually exert on the interface part 300 and the thrust head 33 a force tending to return the thrust head 33 to 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 interface part 300, in this example in translation along the direction D3.

[0073] The springs 31 thus make it possible to dampen movements of the thrust head 33 in the direction D3 around the equilibrium position relative to the interface part 300 and the screw 23 of the drive mechanism and, in particular at the end of the braking phase, to return the thrust head 33 to the equilibrium position.

[0074] The thrust head 33, the interface piece 300 and the springs 31 thus form a transverse force absorption member.

[0075] For information purposes, the springs 31 comprise in this example a stainless steel, for example a steel known under the designation “X10CrNil8-8” (+ C1300), and are designed to have a mechanical resistance of the order of 1300 MPa.

[0076] In this example, the ring 200 is elastically deformable and is provided to facilitate the mounting of the thrust head 33. The ring 200 can in fact be used to compress the springs 31 against the interface part 300 in order to facilitate the insertion of this assembly into the thrust head 33.

[0077] In this example, the thrust head 33 is connected to the interface part 300 via the plate 32 which is generally in the form of a ring.

[0078] The plate 32 is here connected to the interface part 300 so as to be secured to the latter both in rotation around the axis A1 and in translation along A1. In this example, the plate 32 and the interface part 300 comprise for this purpose radially internal and external surfaces, respectively, of generally rectangular section ensuring the securing in rotation around the axis A1, the plate 32 further extending in a groove (not visible in FIGS. 1 and 2) of the interface part 300 ensuring the securing in translation along the axis A1.

[0079] The plate 32 comprises fingers (not visible in FIGS. 1 and 2) which are engaged in grooves (not visible in FIGS. 1 and 2) of the thrust head 33, so as to secure the interface part 300 and the thrust head 33 in translation along the axis AL.

[0080] The thrust head 33 forms a bearing surface 90 extending generally in a plane parallel to the directions D2 and D3 and which constitutes an end surface of the device 5.

[0081] For information purposes, the thrust head 33, the interface part 300, the nut 24 and the screw 23 may comprise a nitrided steel of type “32CDV13” according to the AFNOR standard and be designed to have a mechanical resistance greater than or equal to 1150 MPa and a hardness greater than or equal to 600 HV.

[0082] With reference to [Fig.l], the sealing ring 34 comprises in this example a folded bellows structure which defines a radially internal end 121 housed in a groove 86 of the thrust head 33 and a radially external end 122 which cooperates with an annular surface of the body 2 of the stirrup, this surface delimiting an axial end of the cavity of the body 2 in which the device 5 is housed.

[0083] In the configuration of [Fig.l], the end 122 of the ring 34 cooperates with the aforementioned annular surface of the body 2 of the stirrup so as to allow a translation along DI of the ring 34 relative to the stirrup.

[0084] The drive mechanism may comprise a recirculation mechanism of the balls integrating in a manner known per se one or more recirculation parts or pins (not shown in figures 1 and 2) which can be housed in respective orifices of the nut 24. Such recirculation pins make it possible to guide the balls in a circuit formed by a recirculation channel (not shown in figures 1 and 2).

[0085] In the example of Figures 1 and 2, the sleeve 302 and the inner ring of the bearing 214 typically make it possible to maintain such recirculation pins in their orifice.

[0086] In a non-limiting manner, the brake 1 of [Fig.l] can be used as a service brake.

[0087] In operation, the piston 7 is moved from a rest configuration as illustrated in [Fig.l] to a deployed configuration (not shown) until the brake pads come into contact with the disc and then a braking force is applied.

[0088] In this example, the piston 7 is moved in translation along the axis A1 under the action of the motor 310 and the transmission mechanism 312 which drives the nut 24 in rotation around the axis A1, the rotary guidance of the nut 24 being provided here by the ball bearing 214.

[0089] In this example and purely for information purposes, the device 5 is configured so that an input torque of approximately 33 Nm applied to the shaft 23 of the ball screw system can produce a braking force of approximately 35 kN on the disc and, in reaction, a counter-braking force on the sensor 304.

[0090] During braking, the rotation of the disc exerts transverse forces on the thrust head 33, in particular in the direction D3, which causes a translation of the thrust head 33 in the direction D3 then, in a phase of increasing force, a sliding of the thrust head 33 on the interface part 300. The springs 31 make it possible to take up at least part of these transverse forces without transmitting them to the screw 23, thus decoupling the axial forces and the transverse forces.

[0091] The axial forces are transmitted to the body 2 of the caliper by the collar 404 of the nut 24, via the roller thrust bearing 212 and the sensor 304 which can thus measure them.

[0092] In this example, the sensor 304 has an annular body comprising strain gauges which are connected to a computer (not shown) in order to transmit information to it, in the form of electrical signals, relating to the axial forces thus measured.

[0093] In this example, the computer is configured to control the electric motor 310 and thus adapt the braking force, and / or one or more other parameters such as a torque or a deceleration, as a function of this information and taking into account a braking instruction.

[0094] At the end of braking, the device 5 of the brake 1 is returned to the rest configuration by reversing the direction of rotation of the motor 310.

[0095] Such a brake 1 can also be used in a similar manner as a parking brake.

[0096] Figures 3 to 5 show a braking device 5 according to another embodiment, which is described below only according to its main differences compared to the embodiment of Figures 1 and 2. The preceding description applies of course by analogy.

[0097] With reference to Figures 3 and 5, the interface part 300 and the thrust head 33 are in contact with each other by respective surfaces which are curved, defining a floating pivot type connection which allows these parts to slide relative to each other following a rotational movement.

[0098] Still with reference to Figures 3 and 5, the thrust head 33 comprises in this example a recess 88 so that the bearing surface 90 is annular. Such a recess 88 makes it possible to reduce the contact surface and therefore the thermal conduction, and to dissipate heat during braking.

[0099] In this embodiment, each of the springs 31 is wound around a respective axis parallel to the direction D2, each defining a radially inner end 71 which is free and a radially outer end 72 which is connected to an annular plate 500 arranged on the screw 23.

[0100] The end 72 of each of the springs 31 further has a substantially flat surface facing a corresponding flat surface of the interface part 300 (see figures 3 and 5).

[0101] The drive mechanism of the device 5 of figures 3 to 5 comprises a cage 510 arranged in an opening of the body of the nut 24.

[0102] In a manner known per se, the cage 510 forms an internal path which is configured to form, with an external path of the screw 23, a rolling groove for the balls.

[0103] With reference to [Fig.5], the body of the nut 24 as well as the cage 510 form in this example a channel for recirculating the balls.

[0104] The preceding description is of course not limiting. Among other variants, the braking devices 5 described above may have a different architecture and / or parts which are arranged differently and / or which have other geometric and / or dimensional and / or material characteristics.

[0105] The different embodiments described above can be combined and / or have numerous variants, including those which follow.

[0106] In an alternative embodiment, the body 2 of the stirrup comprises aluminum.

[0107] The collar 404 of the nut 24 may have a different positioning from that illustrated in Figures 1 to 5. In other words, the ratio between the lengths XI and X3 may be different from 1.5 and may, without limitation, be between 0.1 and 2.0.

[0108] The rotational drive of the nut 24 may be achieved by a part other than the bell 340 illustrated in [Fig.l] and / or by a drive part cooperating with a surface of the nut 24 having a geometry other than dodecagonal or polygonal. The nut 24 may for example comprise a toothing of a gear or form an interface known under the name “Torx” (registered trademark).

[0109] As a variant of the embodiment of Figures 1 and 2, the device 5 may be devoid of the ring 200, the latter making it easier to assemble but being optional. In the absence of such a ring 200, the springs 31 or more generally the elastic member(s) may thus come to bear directly on the thrust head 33. For another example, the spiral springs may be replaced by one or more elastic members such as compression springs and / or elastically deformable elements, for example made of elastomer.

[0110] More generally, the device 5 may be devoid of a transverse force absorption member.

[0111] The braking device of the invention may 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.

[0112] The invention also covers a brake comprising one or more braking devices 5 in accordance with the invention.

[0113] In one embodiment, not shown, the brake comprises a high-efficiency reversible geared motor, associated with a parking locking mechanism for the brake in a braking position.

[0114] List of reference numbers: - 1: Caliper brake - 2: Caliper body - 5: Braking device - 7: Piston - 23: Shaft / screw (ball screw system, drive mechanism) - 24: Nut (ball screw system, drive mechanism) - 31: Spiral spring - 32: Retaining plate - 33: Push head - 34: Sealing ring - 71, 72: End of the spiral spring - 86: Thrust head throat - 88: Recess of the thrust head - 90: Support surface of the thrust head 121, 122: End of the sealing ring 200: Ring 210: Washer 212: Roller thrust bearing / axial force transmission member 214: Ball bearing / radial guide member 216: Spring washer 218: Ring 300: Interface part 302: Socket 304: Force sensor 306: Stop ring 310: Electric motor (actuator) 312: Transmission mechanism 320, 322: Gear wheel (transmission mechanism) 330: Inner planetary gear (epicyclic gear train, transmission mechanism) 332: Crown / outer planetary gear (epicyclic gear train, transmission mechanism) 334: Satellite (epicyclic gear train, transmission mechanism) 340: Bell (transmission mechanism) 342: Surface of the bell 402, 406: Nut body sections (ball screw system, drive mechanism) 404: Nut body collar (ball screw system, drive mechanism) 410, 412, 414, 420, 422: Nut body surface (ball screw system, drive mechanism) 500: Spiral spring support plate 510: Cage (ball screw system, drive mechanism) Al: Longitudinal axis DI: Axial / longitudinal direction (reference) D2, D3: Transverse direction (reference) SI, S2: Direction of movement XI, X2, X3: Longitudinal dimension / length (nut)

Claims

Claims

1. Nut (24) of a ball screw drive mechanism intended to move a piston (7) of a caliper brake (1), the nut (24) comprising a body extending around a longitudinal axis (Al) and comprising, successively along the longitudinal axis (Al): - a first section (402) intended to receive a member (212) for transmitting axial force, - a collar (404) configured to be able to bear on said transmission member (212) in order to transmit an axial force to a body (2) of the caliper via this transmission member (212), - a second section (406) intended to receive a member (214) for guiding the nut (24) in rotation around the longitudinal axis (Al).

2. Nut (24) according to claim 1, in which the first section (402) has a first length (XI) along the longitudinal axis (Al) and the second section (406) has a second length (X3) along the longitudinal axis (Al), the ratio between the first length (XI) and the second length (X3) being between 0.1 and 2.0, preferably between 0.2 and 1.9, more preferably between 0.7 and 1.3, for example equal to 1.

0.

3. Nut (24) according to claim 1 or 2, wherein one (402) of the first section (402) and the second section (406) is configured to cooperate with a member (340) for driving the nut (24) in rotation around the longitudinal axis (Al), this section (402) comprising for example a polygonal or toothed surface (410) configured to cooperate with said driving member (340) by shape complementarity.

4. Nut (24) according to any one of claims 1 to 3, comprising a cage (510) disposed in an opening of the body of the nut (24), the cage (510) comprising an inner race configured to form with an outer race of said ball screw a rolling groove for the balls, the body of the nut (24) preferably forming a recirculation channel for the balls.

5. Braking device (5) for a caliper brake (1), comprising a piston (7) and a piston (7) drive mechanism configured to move the piston (7) in translation along a longitudinal axis (Al) relative to a body (2) of the caliper, the drive mechanism comprising a ball screw (23) and a nut (24) according to any one of claims 1 to 4.

6. Device (5) according to claim 5, comprising: - an axial force transmission member (212) such as a roller thrust bearing, this transmission member (212) being mounted on said first section (402) of the nut (24) and configured to be interposed axially between said collar (404) and a body (2) of the caliper in order to allow the nut (24) to transmit an axial force to the body (2) of the caliper via this transmission member (212), and / or - a guide member (214), such as a ball bearing, this guide member (214) being mounted on said second section (406) of the nut (24) and configured to extend radially between said second section (406) of the nut (24) and said body (2) of the caliper in order to ensure guidance of the nut (24) rotating around the longitudinal axis (Al),and / or - a force sensor (304) configured to measure an axial force transmitted to said body (2) of the caliper by said collar (404).,

7. Device (5) according to claim 6, wherein the nut (24) comprises a ball recirculation channel, at least one orifice and at least one so-called recirculation part which is housed in the at least one orifice, the at least one recirculation part being configured to guide the balls in a circuit formed by the recirculation channel, said guide member (214) being configured to maintain the at least one recirculation part in the at least one orifice.

8. Device (5) according to any one of claims 5 to 7, comprising a thrust head (33) connected to the screw (23) so as to allow movements of the thrust head (33) relative to the screw (23) in a transverse direction (D3), the device (5) preferably comprising one or more elastic members such as spiral springs (31) extending radially between on the one hand the thrust head (33) and on the other hand the screw (23) and / or a part interface (300) connected to the screw (23), so as to allow and / or dampen movements of the thrust head (33) in the transverse direction (D3) around an equilibrium position relative to the screw (23) and to return the thrust head (33) to the equilibrium position.

9. Brake (1) with caliper, preferably floating, comprising at least one braking device (5) according to any one of claims 5 to 8.

10. Brake (1) according to claim 9, comprising at least one electric actuator (310).

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