Compact electromechanical brake

Abstract

An electromechanical drum brake comprises two brake shoes (3, 4) intended to be in contact with a drum, at least one actuator (110) configured to abut the brake shoes (3, 4) against the drum, and an electric motor (22). The electric motor is arranged to activate the actuator (110), the actuator (110) comprising at least one movable element (18) after the actuator (110) is activated, the movable element (18) being movable between a braking position and a position beyond a release position, in which the brake shoes are no longer in contact with the drum. The actuator (110) comprises a stopper (126) which is arranged only in the actuator and when the movable element (18) is in a position beyond the release position, the movable element abuts against the stopper, and the motor powers the actuator until the movable element (18) abuts against the stopper (126).

Description

Background Art

[0001] The invention relates to an at least partially electrically actuated automotive vehicle brake which provides greater compactness.

[0002] In most cars today, the service brakes are either disc brakes and / or drum brakes.

[0003] These service brakes, when in service braking function, aim to slow down or even stop the motor vehicle. Systems with parking brakes usually have a parking brake function for immobilizing a stationary vehicle, as well as an emergency brake function.

[0004] The parking brake can be applied by pulling a lever located in the passenger compartment, which is connected by a brake cable to a mechanism located in the drum brake or disc brake. The mechanism tends to separate the brake shoes of the drum brake so that the brake shoes are pressed against the drum. In a disc brake, the brake pads clamp onto the brake disc.

[0005] To increase driver comfort and safety when using the parking brake, the automotive industry has developed an electric parking brake.

[0006] For example, an actuator of an electric motor is provided at least on each rear brake, so that these brakes can all participate in braking.

[0007] The driver activates the electric parking brake by pressing a button, for example, provided on the dashboard.

[0008] Electric parking brake systems include DC electric motors, the use of which is recommended by the German Association of the Automotive Industry in its “VDA Recommendations”.

[0009] In the case of disc brakes, usually the actuator moves the piston, and the piston presses the brake pad against the brake disc. In the case of drum brakes, the actuator is arranged, for example, between the brake shoes and serves as a fixing point when the service brake is applied via the wheel cylinder. For example, the actuator is of the screw-nut type and separates the brake shoes.

[0010] No sensors are provided in the actuator to position the relative position of the mechanical elements of the brake. Measuring the current and / or voltage on the electric motor enables knowledge of the state of the applied brake. In fact, an increase in the current and / or voltage corresponds to the application state of the parking brake.

[0011] Furthermore, it is currently desirable that nothing contact the mechanical stop during the release stroke to avoid damage to the brake, for example, it is desirable that the piston not abut against the bottom of the caliper.

[0012] At present, the relative position of the mechanical elements of the brake during the application of the parking brake is obtained by estimating the application position given by the current and / or voltage values ​​on the electric motor, for example by counting the number of revolutions of the nut of the actuator. However, at the end of the brake release phase, the estimation of the relative position of the mechanical elements of the brake is not very accurate. Taking into account this inaccuracy and in order to prevent the brake components from colliding with each other, an error margin is allowed in the estimated position. In addition, taking into account the dimensional inaccuracies inherent in the manufacture of the brake, an additional safety margin is required. Therefore, the size setting of the brake includes these errors and safety margins. The brake therefore has a certain overall size. In addition, due to the inaccurate position of the components in the released state, the starting position of the next braking operation is unknown. In addition, the stroke covered by (multiple) components is extended, which increases the brake application time and also increases the time when the actuator emits noise.

[0013] Document US 2014 / 0345989 describes a drum brake comprising an electric actuator for a parking brake, implementing a lever. Therefore, the overall dimensions of the drum brake are large. Summary of the invention

[0014] It is therefore an object of the present invention to provide an at least partially electrically actuated automotive vehicle brake which is compact and offers increased control precision.

[0015] The above-mentioned object is achieved by a vehicle brake for an automobile, which comprises at least one electric actuator for moving one or more elements of the brake so as to apply a braking force to an element rotatably integrated with a wheel. The actuator comprises at least one mechanical stop. The actuator is controlled so that at least one movable element of the actuator abuts against the stop during the brake release phase. Since the position of the stop is known within the manufacturing gap, the position of at least one element can be known with greater accuracy. The size of the brake can then be set as accurately as possible, i.e., without taking into account the margins resulting from inaccurate estimates of the retracted position. As a result, the travel distance to be traveled for applying the brake is reduced and the braking time is shortened. The time during which the actuator makes noise is also substantially reduced, and the duration of discomfort felt by the vehicle driver and passengers is also shortened.

[0016] In other words, an actuator is manufactured in which the position of at least one movable element is automatically set to the rest state of the actuator in order to reduce the uncertainty of its position and therefore have greater freedom in choosing the dimensions of the actuator, for example making it more compact.

[0017] In one example, the brakes include an electric actuator for applying the parking brake and a hydraulic actuator that provides service braking functions.

[0018] In another example, the brakes are fully electrically actuated, where the actuator provides both parking and service braking.

[0019] In one example, the actuator is of the lead screw nut type and the stop means comprises teeth on the threads forming a stop for the nut. In another example, the actuator comprises an elastically deformable device capable of storing energy and the stop means forms a stop for at least a portion of the elastically deformable device.

[0020] An object of the present invention is an electromechanical brake comprising at least one friction member, at least one actuator, at least one actuator, and an electric motor. At least one friction member is in contact with a friction component rotatably integrated with a wheel. At least one actuator is configured to apply the friction member to the friction component. The electric motor is configured to start the actuator. The actuator comprises at least one movable element. After starting the actuator, the movable element is able to move between a braking position in which the friction member is in contact with the friction part and a position beyond a release position. In the position beyond the release position, the friction member is no longer in contact with the friction component. The actuator comprises a stop device, which is arranged to abut against the stop device when the movable element is in a position beyond the release position, and in the brake release phase, the electric motor is used to start the actuator until the movable element abuts against the stop device.

[0021] Preferably, the electromechanical brake comprises a control unit including control means for controlling power supply to the electric motor and measuring means for measuring power consumption of the electric motor, the control means being configured to stop power supply to the electric motor when power consumption exceeds a given value.

[0022] Advantageously, the actuator is arranged to apply at least the parking brake, and wherein the brake comprises a second actuator for applying the service brake.

[0023] For example, the brake is a drum brake comprising a drum, a base plate, two brake shoes, the actuator being attached to the base plate.

[0024] In an advantageous example, the actuator comprises a screw and nut assembly. The nut forms the movable element. The screw comprises a head and a screw provided with a thread comprising a pitch. The head forms a piston abutting against one of the brake shoes. The stop means comprises teeth protruding from the thread, the teeth being arranged to contact the nut when the nut is in a position beyond the release position.

[0025] For example, the actuator may comprise a body and elastically deformable means capable of storing energy upon application of actuation of the actuator. At least a portion of the deformable means forms the movable element, and the body may comprise stop means.

[0026] A further object of the present invention is to provide a method for manufacturing an electromechanical brake according to the present invention, the method comprising:

[0027] a) determining a position of at least one movable element beyond which the brake is released,

[0028] b) determining a position of the stop means relative to the release position such that the stop means is spaced from the release position by at least one manufacturing gap associated with the method,

[0029] c) placing the stop means in the actuator in the position determined in step b),

[0030] d) Assemble the actuator and friction member. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be better understood based on the following description and the accompanying drawings, in which:

[0032] Figure 1 is a schematic diagram of the estimated movement of a movable element of an actuator of an electromechanical brake of the prior art.

[0033] Figure 2 is a schematic diagram of an estimated movement of a movable element of an actuator of an electromechanical brake according to the invention.

[0034] Figure 3 is a perspective schematic diagram of an example of an electric parking drum brake according to the present invention.

[0035] Figure 4 is a partially cutaway perspective schematic diagram of an exemplary actuator of a drum brake according to the present invention.

[0036] Figure 5 is a schematic cross-sectional view of another example actuator of a drum brake according to the present invention. DETAILED DESCRIPTION

[0037] exist Figure 3 In the figure, a “dual mode” drum brake 2 can be seen in an exemplary embodiment of the invention.

[0038] The drum brake 1 comprises a drum (not shown) movably integrated with a wheel (not shown), an X-axis rotating base plate 2 equipped with a first arc-shaped shoe 3 and a second arc-shaped shoe 4, which are radially movable so that they can be pressed against the cylindrical inner surface of the drum (not shown).

[0039] The shoes 3 and 4 each comprise a web 3a, 4a made of a portion of a flat plate carrying a circular crown of a brake lining 3b, 4b, and are mounted radially opposite one another, the ends of the shoes bearing both on a hydraulic wheel cylinder 6 and on a mechanical actuator 10 carried by the base plate 2. These shoes 3 and 4 are further biased towards one another by two return springs 8 and 9, and each shoe is pressed against the base plate 2 by a so-called side spring.

[0040] A wear adjustment link 7 extends along the wheel cylinder 6 , a first end of which is supported on the web 3 a of the first shoe 3 , and a second end of which is supported on the web 4 a of the second shoe 4 when the brake is stationary.

[0041] When the drum brake 1 is used according to a first so-called "single" operating mode, the wheel cylinder 6 is intended to be actuated, which ensures progressive braking, particularly suitable for vehicles in braking operation. The wheel cylinder comprises a hydraulic chamber whose ends are closed by two pistons which move away from each other and push the associated ends of the shoes 3 and 4 when the hydraulic pressure increases.

[0042] In particular, when the wheel cylinder 6 is not active, the mechanical actuator 10 then ensures parking and emergency braking according to the so-called "double servo" operating mode by moving the relevant ends of the shoe apart to ensure rapid and powerful locking of the vehicle wheel. This actuator is driven by an electric motor 22. In the example shown, the wheel cylinder comprises two opposite pistons, each of which actuates one of the shoes 3, 4 respectively, by spacing apart two opposite ends 3.1, 4.1, which are located on the same side of the axis of rotation X, here called "movable ends", and are located Figure 3 At its opposite end 3.2, 4.2, called the stop end, each shoe is supported on the base plate 2 by an anchoring element integral with the base plate, forming a stop for this shoe. The anchoring element transmits at least part of the braking torque between the shoe and the base plate. The anchoring elements of the two shoes are formed by the actuator 10.

[0043] The actuator 10 extends along an axis X perpendicular to the base plate and parallel to the base plate's axis Y. The actuator comprises a housing 12 attached to the base plate 2 on one side of the first face. The housing comprises a casing formed by a through hole 13 extending along the axis Y and open at both longitudinal ends of the housing 12. The drive assembly is housed in the through hole 13.

[0044] The drive assembly is, for example, of the spindle-nut type, such as that described in application WO 2015 / 101486. ​​The drive assembly comprises two support elements 16, 20, which are used to form the fixing points of the ends 3.2, 4.2 of the brake shoes 3, 4 respectively in service braking and to exert a force on the ends 3.2, 4.2 by moving along the axis Y toward the outside of the housing in parking braking.

[0045] The drum brake also comprises a drive device 22 for the actuator, which is attached to the other side of the base plate opposite to the side on which the actuator 10 is mounted.

[0046] The drive device is an electric motor which may or may not be associated with a motor reducer.

[0047] A passage (not shown) is provided through the base plate 2 to allow drive transmission from the drive means to the drive assembly of the actuator 10 .

[0048] exist Figure 4 In FIG. 1 , an exemplary drum brake actuator 10 according to the present invention can be seen. The actuator comprises a first threaded element 16 and a second element 18, the second element having an internal thread receiving the first threaded element 16, the first element and the second element interacting to form a screw-nut system. This screw-nut system generates a linear movement under the action of the rotation of the second element 18 relative to the first element 16. The screw-nut system converts the torque received by the second element 18 into two opposite axial forces acting on each element 16, 18 respectively.

[0049] The first element 16 forms a piston against the brake shoe 3, and the second piston 20 is interposed between the brake shoe 4 and the second element 18. The second element 18 is rotatably driven by a toothed wheel 24 rotated by a drive device. In the example shown, the first element 18 is mounted in the toothed wheel 24 and is rotatably fixed relative to the toothed wheel by splines.

[0050] In this embodiment, the force transmission obtained is irreversible by selecting the thread angle of the screw-nut system to be smaller than the friction angle of the pair of materials used to make the two elements.

[0051] This choice of a screw-nut system in combination with this choice of thread angle creates the irreversibility of the locking function in the parking brake position. That is, the forces received by the pistons 16, 20 from the shoes 3, 4 are prevented by the anti-slip effect between the threads of the two elements of the screw-nut system. As a result, the forces are not transmitted to the motor system, thereby preventing the motor from being blocked or being put under load.

[0052] Furthermore, if Figure 4As can be seen in the figure, the actuator 10 also comprises an elastically deformable element along the axis of the actuating movement, a so-called elastic element or spring pack, for providing a force stabilizing function in the support chain. In this exemplary embodiment, this elastic element is made of one of the two pistons, in this case the second piston 20. Depending on the force transmitted in the direction of movement of the spreader, this elastic element has a determined spring constant to provide a stroke that allows maintaining or restoring the shoe's full bearing on the drum under different environmental or situational changes.

[0053] Alternatively, the spring pack is arranged between the second piston 20 and the second element 18 .

[0054] In particular, if the support of the wheel cylinder 6 is interrupted after activating the actuator 10, this elastic element is therefore likely to store a sufficient amount of mechanical energy by being compressed in the actuating assembly after activating the actuator when the device is in the first braking position, so as to be used to maintain the device in the second braking position or to bring the device into the second braking position without having to activate the actuator again.

[0055] This occurs, for example, when the driver stops the vehicle and uses the service brake to hold it stationary, then engages the parking brake and then releases the service brake control, such as when stopping to park on a slope. This elastic reserve compensates for the travel required to move from one braking position to another (e.g. from single mode to dual servo mode) while providing sufficient load to meet the need to hold the vehicle stationary.

[0056] The travel of this elastic element also enables the following operations to be carried out during the dimensional change of the elements 3, 4 of the drum brake and without activating the actuator 10:

[0057] - maintaining the bearing force of the shoes 3, 4 against the friction rail in the event of a dimensional change in one direction, for example in the event of thermal contraction of the shoes or of an element of the mechanical chain that produces such bearing (such as a piston or a mechanism that moves the piston apart), or for example in the event of thermal expansion of the drum; and

[0058] - an increase in the forces in the limiting mechanism in the case of dimensional changes in the other direction, which dimensional changes may be caused by thermal contraction of the drum when it cools down while stationary, after being heated as a service brake, for example during driving.

[0059] Such an elastic element thus makes it possible to limit and very often avoid any need for automatic re-activation of the system during parking (also known as “re-clamping”), which can be energy-consuming and can result in malfunctions that could have serious consequences.

[0060] In the embodiment where the movement of the actuator is achieved by a mechanism of the irreversible type, the elastic element is located downstream of the irreversible mechanism.

[0061] exist Figure 4 In the example of the embodiment of the present invention, the elastic element is provided here by the second piston 20, which comprises a piston head 202, which has a skirt at the rear, in which the piston bottom 203 can slide. The piston head 202 and the piston bottom 203 are pressed against each other by a compressible elastic structure 201 (in this case, a stack of advantageously prestressed conical steel washers, called "Belleville" washers). The assembly is held together by curling the ends of the skirt around the rear of the piston bottom 203.

[0062] According to the invention, the drum brake comprises a device 26 forming a stop for at least one of the movable elements of the actuator 10 during the release phase of the parking brake.

[0063] The movable element has a release position Pr, according to which, during the brake release phase, it is determined that the parking brake has been released. During the release phase, the device 26 is arranged in the actuator in a position Pb beyond the release position Pr.

[0064] The term "movable element of the actuator" refers to the actuator element that is moved when the parking brake is applied and released.

[0065] According to a first example, the stop means are arranged between the spring pack and the body of the actuator 10 .

[0066] When the actuator is activated to release the parking brake, the second element 18 slides along the axis Y of the actuator towards the first piston 16, and the second piston 20 moves in the direction S2 under the action of the shoe 4 pulled back inward by the return spring 8. Further, the spring pack relaxes, causing the bottom 203 of the second piston 20 to move in the direction S2. The actuator is in a brake released state, and the bottom 203 of the second piston 20 is in the position Pr. The bottom 203 continues to move to abut against the axial stop and reaches the static position Pb. When the spring pack is completely released, the position Pb of the stop 26 makes the bottom 203 abut against the spring pack. In the example shown, the stop 26 is a shoulder formed in the hole 13 of the actuator housing 12. The end of the second element 18 for contacting the second piston 20 slides in the reduced diameter portion of the hole 13.

[0067] At each release of the parking brake, the position Pb of the bottom 203 remains the same. This position is known within the manufacturing tolerances.

[0068] Therefore, at the beginning of each activation of the parking brake, the position of the second piston 20 is known within the manufacturing gap. After activation of the actuator 10, the position of the second piston can then be estimated relatively accurately by counting the number of revolutions of the second element 18, which is known from the number of revolutions of the motor and the reduction ratio between the motor and the second element 18. The estimation uncertainty caused by the uncertainty of the position of one of the actuator elements at rest is eliminated. In the brake release phase, the position Pb is downstream of the position Pr in the movement direction of the movable element.

[0069] exist Figure 5 In another exemplary embodiment shown, the actuator 110 comprises a stop formed by teeth 126 on the thread of the first piston 16, against which the longitudinal end 18.1 of the second element 18 oriented on the side of the first piston 16 abuts when the actuator is in the release position. Figure 5 The teeth 126 are schematically represented in FIG.

[0070] Now it will be from Figure 5 Example combination Figure 2 The operation of the brake according to the invention is described with reference to a schematic diagram of the movement D of the second element 18 in FIG.

[0071] Figure 2 The position in is the position of the longitudinal end 18 . 1 of the second element 18 for contacting the tooth 126 .

[0072] Now consider the case where the parking brake is applied ( Figure 5 ). The first element is in position Ps. The pistons 16 and 20 move away from each other and press the brake shoe against the drum. When the parking brake is applied, the longitudinal end 18.1 of the second element 18 is in position Pf.

[0073] If the driver decides to deactivate the parking brake, he or she controls the activation of the actuator 10, for example by pressing a button, and the second element 18 is rotated by the electric motor and the toothed wheel, so that the pistons 16 and 20 slide towards each other. The second piston 16 (in particular its threaded rod) slides in the second element 18, and the piston head 16.1 moves close to the longitudinal end 18.1 of the second element. The second element 18 is rotated until the pistons 16, 20 have traveled towards each other until a stroke that is considered sufficient to ensure the release of the parking brake, and then the longitudinal end 18.1 of the second element 18 is in position Pr. The second element 18 is then rotated until the tooth 126 abuts against the longitudinal end 18.1 of the second element, and the longitudinal end 18.1 of the second element 18 is in position Pb. The control unit UC then measures the increase in the current on the electric motor and controls the cessation of the supply of power to the electric motor. The actuator stops.

[0074] By advantageously choosing the position of the tooth 126 so that contact between the tooth and the second element 18 occurs just after the release stroke has been travelled, a very compact brake is obtained.

[0075] Therefore, when designing the brake, in particular the actuator, the axial dimensions of the actuator are selected so that the second element 18 can travel the distance between Pr and Pb. Since the position Pb is known within the manufacturing clearance, the length of the actuator can be optimized and no additional margin needs to be provided to account for the uncertainty of the position of the second element in the released position. The distance between Pb and Pr is at least equal to the manufacturing clearance. Figure 2 In , this distance is slightly larger than the gap j.

[0076] exist Figure 1 In FIG. 1 , the movement of the second element 18 in the prior art actuator can be seen. The rest position adopted by the second element is the estimated position Pe, which is estimated to have an error margin e. The dimensioning of the actuator takes into account the error margin e and the manufacturing clearance j of the position Pb' of the stop. Taking into account Figure 5 For actuators of the type shown, the length of prior art actuators is greater than Figure 5 The length of the actuator according to the invention is at least 2e greater.

[0077] By means of the invention, a reduction of 2 mm in length of the actuator can be achieved.

[0078] Further, by optimizing the stroke of the first element, ie by reducing it, the application of the parking brake during the next activation of the parking brake will be faster, since the travel distance of the first element is shorter.

[0079] According to another exemplary embodiment, a stopper is provided on the body of the actuator, and in the stop position, the first element 18 abuts against the stopper.

[0080] The invention is also applicable to electromechanical disc brakes.

[0081] The invention is applicable to both floating caliper disc brakes and fixed caliper disc brakes.

[0082] In the example described, the movable element(s) of the actuator moves along an axis and possibly rotates around the axis. In another example, the actuator has at least one component that is only movable in rotation, such as a cam-type component, and the stop forms an angular stop. The stop device only interrupts the rotational movement.

[0083] exist Figure 4 In the example of , the stop device forms an axial stop for the spring pack. Figure 5In the example shown, the stop means forms a rotational stop and interrupts the translational movement. Further alternatively, the stop means forms an axial stop for the element that is movable both in rotation and in translation.

[0084] The method for making Figure 5 Schematic method of the brake shown.

[0085] First, the minimum movement of the movable element(s) of the actuator is determined to ensure that the brake is released. Based on this minimum movement, the position that the movable element(s) must reach during the release phase in order to release the brake is determined. This position is Figure 2 Position Pr in.

[0086] The position of the stopper Pb is then determined relative to the position Pr, taking into account the manufacturing gap j. The minimum distance between Pr and Pb is at least equal to j.

[0087] The stop means are made on the body of the actuator or another part of the actuator so that the movable part contacts the stop when it is in position Pb (ie Pr+j). Various parts of the actuator are adapted to this movement, especially the housing with greater compactness.

[0088] In case the movable element has only rotational movement, the movement is an angular movement.

[0089] The invention is applicable to all electromechanical brakes which are partially or fully electrically actuated. The invention is applicable to brakes which realize parking brake and / or service brake by electrical actuation. In the case of electromechanical brakes in which service brake is provided by an electric actuator, contact between at least one movable element of the actuator and the arresting device occurs at each complete release of the service brake.

[0090] Reference numerals

[0091] 1 drum brake

[0092] 2 Bottom plate

[0093] 3 First Hoof

[0094] 4 Second Hoof

[0095] 3a, 4a web

[0096] 3b, 4b brake linings

[0097] 6 Hydraulic wheel cylinders

[0098] 7 Wear adjustment connecting rod

[0099] 8, 9 return spring

[0100] 10 Mechanical Actuators

[0101] 12Actuator housing

[0102] 13 Actuator hole

[0103] 16First element / first piston

[0104] 16.1 Head of the second piston

[0105] 18 Second Element

[0106] 18.1 Longitudinal end of the second element

[0107] 20 Second piston

[0108] 22 Electric Motor

[0109] 24 toothed wheel

[0110] 26 / 126 Stop device

[0111] 201 Spring Bag

[0112] 202 Second piston head

[0113] 203 Top of the second piston

[0114] X and Y axes

[0115] eError margin

[0116] jManufacturing gap

[0117] Pb, Pb' stop position

[0118] Pe estimated position

[0119] Pf brake position

[0120] Pr release position

[0121] UC control unit.

Claims

1. An electromechanical brake comprising at least one friction member (3, 4) in contact with a friction component rotatably integral with a wheel, at least one actuator (10, 110) configured to apply the friction member (3, 4) to the friction component, and an electric motor (22) configured to activate the actuator (10, 110), the actuator (10, 110) comprising at least one movable element (18, 303) capable of moving between a braking position (Pf) and a position (Pb) beyond a release position (Pr) after activating the actuator (10, 110), wherein the friction member (3, 4) is in contact with the friction component and wherein the friction member is no longer in contact with the friction component, characterized in that The actuator (10, 110) comprises a stopper (26, 126) which is arranged only in the actuator (10, 110) and causes the movable element (18, 303) to abut against the stopper (26, 126) when it is in a position beyond the release position (Pr), the electric motor being controlled to start the actuator in the brake release phase until the movable element (18) abuts against the stopper (26, 126), wherein the electromechanical brake is a drum brake comprising a drum, a base plate (2), and two brake shoes (3, 4), the actuator being attached to the base plate (2); The actuator comprises a set of screw rod and nut assembly and two pistons, each piston abutting against a brake shoe.

2. An electromechanical brake according to claim 1, comprising a control unit (UC), the control unit comprising control means for controlling the power supply to the electric motor (22) and measuring means for measuring the power consumption of the electric motor (22), the control means being configured to stop the power supply to the electric motor (22) when the power consumption exceeds a given value.

3. The electromechanical brake according to claim 1, wherein: The actuator (10, 110) is configured to apply at least a parking brake, wherein the electromechanical brake comprises a second actuator (6) for applying a service brake.

4. The electromechanical brake according to claim 1, wherein: The nut forms the movable element (18), and wherein the screw comprises a head and a screw, the screw comprising a thread with a pitch, the head forming a piston abutting against one of the brake shoes, and wherein the stop means comprises teeth (126) protruding from the thread so that the teeth contact the nut when the nut is in a position beyond the release position.

5. The electromechanical brake according to claim 1, wherein: The actuator (10) comprises a body (12) and an elastically deformable device, the elastically deformable device being capable of storing energy when the actuator is activated, at least a portion of the elastically deformable device forming the movable element, wherein the body (12) comprises the stop device (26).

6. A method for manufacturing an electromechanical brake according to claim 1, the method comprising: a) determining a position of the at least one movable element (18, 303), beyond which the electromechanical brake is released, b) determining a position of the stop means (26, 126) relative to the release position (Pr) such that the stop means (265, 126) is spaced from the release position (Pr) by at least one manufacturing gap (j) associated with the method, c) placing the stop means (26, 126) in the actuator in the position determined in step b), d) Assembling the actuator and the friction member.

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