Disc brake, especially for motor vehicles

Abstract

The invention relates to a disc brake comprising a caliper having opposite each other a fixed brake pad (P1) and a movable brake pad (P2), and an actuation mechanism for the movable brake pad (P2) comprising a screw / nut system and means for transmitting a rotational movement from a drive shaft (4) to the screw / nut system to actuate the movable brake pad (P2), said actuation mechanism being mounted in a through-hole (L) formed in the caliper, an electric motor (M) and an electronic control unit (ECU) for controlling the actuation of said actuation mechanism.The invention consists in the fact that the electric motor is contained in an open housing, fitted onto the bracket to assemble the motor shaft (4) of the electric motor (M) onto the transmission means, a cover and fixing cover (30) being attached to said housing and fixed to the bracket, said cover and fixing cover (30) comprising means for receiving the electronic control unit (ECU). Figure 8.

Description

Title of the invention: Disc brake, in particular for motor vehicles.

[0001] The invention relates to a disc brake, particularly for a motor vehicle, comprising a caliper capable of spanning a sector of a disc attached to a wheel of said vehicle, so as to position a brake pad on each side of the disc, with means for controlling the clamping of the brake pads on the disc. Such a brake comprises a caliper having, opposite each other, a fixed brake pad and a movable brake pad, as well as an actuation mechanism for the movable brake pad comprising a screw / nut system and means for transmitting a rotational movement from a drive shaft to the screw / nut system to actuate the movable brake pad, said actuation mechanism being mounted in a through-hole formed in the caliper, an electric motor and an electronic control unit for controlling the actuation of said actuation mechanism.

[0002] State of the art.

[0003] In a disc brake, a caliper is rotationally fixed to the vehicle, for example, to the wheel hub. The caliper generally comprises two arms connected by a crossbar and spans a sector of a disc that is fixed to the wheel, with one arm on each side of the disc. The caliper clamps the disc between its arms by means of a pair of friction linings, or brake pads, one on each side of the disc. For braking, these pads are pressed against the disc by the action of one or more brake pistons, actuated either by hydraulic pressure when used as a service brake or by electromechanical means when used as a parking brake. This clamping creates friction between the brake pads and the disc, which dissipates the kinetic energy of the wheel as heat and achieves braking.

[0004] The service brake function consists of slowing the vehicle down while it is moving, if necessary to a complete stop. In addition to the service brake, such a disc brake can also be used as an emergency brake and / or parking brake, also called a parking brake.

[0005] Where the disc brake includes electromechanical means for actuation of said brake, said electromechanical means comprise, on the one hand, a screw / nut assembly and, on the other hand, an electric geared motor assembly for rotating the nut of the screw / nut assembly in both directions. A disc brake of this type is, for example, described in FR-A-3 116 576.

[0006] The caliper in this document has two arms, one carrying a fixed brake pad and the other a movable brake pad arranged opposite each other, the movable brake pad being driven in movement towards the fixed part by means of an electromechanical actuator comprising a ball screw-nut system and a rotation control interface from a motor.

[0007] The nut is fixed in translation in a housing of the caliper arm and its rotational drive by the motor's rotational control interface generates the translational displacement of the screw, one end of which is connected to the movable brake pad.

[0008] Thus, the rotation of the nut in a first direction causes the translation of the protruding screw of the caliper arm and therefore the translation of the moving brake pad towards the fixed brake pad, to control the tightening of the disc while the rotation of the nut in the opposite direction causes the translation of the screw in the opposite direction and therefore the spreading of the moving brake pad to control the loosening.

[0009] A brake such as the one described above has, however, a complex and, moreover, relatively bulky structure, linked in particular to the interface between the motor shaft and the nut of the screw / nut system.

[0010] Furthermore, the electric motor is mounted on the axis of the actuation system, and the housing containing it also houses the electronic control unit, known by the English acronym ECU (electronic control unit). Such a housing, comprising both the electric motor and the electronic control unit, is relatively bulky. Moreover, during the mounting of the electric motor, the connection to the transmission means must be perfectly centered, which can prove difficult to achieve and maintain, particularly when attaching the housing to the bracket.

[0011] The invention therefore aims to provide a disc brake of this type which has a simpler structure and therefore a reduced size, and in which the centering of the electric motor during assembly is facilitated and guaranteed.

[0012] Thus, a first object of the invention is to provide a disc brake comprising a caliper having, opposite each other, a fixed brake pad and a movable brake pad, as well as an actuation mechanism for the movable brake pad comprising a screw / nut system and means for transmitting a rotational movement from a drive shaft to the screw / nut system to actuate the movable brake pad, said actuation mechanism being mounted in a through-hole formed in the caliper, an electric motor and an electronic control unit for controlling the actuation of said actuation mechanism, characterized in that the electric motor is contained in a housing open, fitted onto the bracket to assemble the electric motor shaft onto the transmission means, a cover and fixing hood being attached to said housing and fixed to the bracket, said cover and retaining hood having means for receiving the electronic control unit.

[0013] Thus advantageously, by separating the housing containing the electric motor and the cover and fixing cover of said electric motor on the bracket, the assembly of the motor is carried out by a simple fitting of the housing containing the electric motor onto a complementary part of the bracket, which allows an easy and centered assembly of the motor with the transmission means, while the assembly of the cover allows the positioning of the housing to be fixed subsequently without risk of offset or deformation which would be linked to a fixing by screwing the housing onto the bracket.

[0014] The brake generally comprises a caliper with two arms defining a space between them, such that the brake is mounted overlapping a disc attached to a wheel. A sector of the disc is thus housed between the arms of the caliper, each carrying a brake pad. One of the brake pads, called the moving pad, is steerable relative to the other, called the fixed pad, which is guided in translation along an axis XX- perpendicular to the disc interposed between the brake pads, in a clamping or releasing action. One of the arms of the caliper therefore includes the housing in which the screw-nut system of the mechanism for actuation of the moving brake pad is mounted. This cylindrical housing is open at one end in the space between said arms and, at its other end, accommodates the means for transmitting the rotation of the drive pinion to the screw.

[0015] The housing containing the electric motor comprises a base and a peripheral skirt designed to fit onto the bracket. The bracket arm preferably includes additional means for attaching the housing containing the electric motor, these means being, for example, a shoulder or a groove surrounding the end of the receiving recess. The peripheral skirt of the housing thus fits against the shoulder or into the groove provided on the bracket. The cover and mounting cap is then positioned against the housing and secured to the bracket.

[0016] Advantageously, the cover and fixing hood includes means for receiving the electronic control unit.

[0017] This cover and mounting bracket has a shape suitable for covering the caliper, such as an L-shape, one arm of which extends along the motor to cover and hold it, and the other extends over the caliper. This shape advantageously allows for the distribution of the various ECU components and, in particular, for distancing certain electronic components from the electric motor.

[0018] Preferably, the cover consists of two walls extending substantially perpendicularly to each other in an L-shape, and has fastening means adapted to cooperate with additional fastening means provided on the bracket. Lateral walls extend along the two plates, carrying fastening means such as holes for the passage of fastening screws, these holes being provided in correspondence with screw holes provided in the bracket.

[0019] The cover having an L-shape, the electronic control unit is mounted on a plate that also has an L-shape, complementary to that of the cover and mounting plate, thus providing a larger positioning surface for the electronic components, allowing for the distribution of the various electronic components, including certain components located away from the electric motor's heating element. A protective plate is attached to the electronic control unit.

[0020] Thus, the invention proposes a design and structure of the electric motor assembly and the electronic control unit which allows the motor to be centered on the caliper using a housing and a cover and fixing cover made of plastic / or aluminum with which the electronic control unit is fixed to the caliper by two screws.

[0021] According to a second object of the invention, the disc brake comprises a caliper having, opposite each other, a fixed brake pad and a movable brake pad, as well as an actuation mechanism for the movable brake pad comprising a screw / nut system and means for transmitting a rotational movement from a drive shaft to the screw / nut system to actuate the movable brake pad, the caliper comprising a housing in which the screw / nut system and the means for transmitting the rotational movement from the drive shaft to the screw / nut system are mounted, the brake in which the screw of the screw-nut mechanism is mounted fixed in translation within said housing and driveable in rotation by the transmission means, while the nut mounted fixed in rotation within said housing is driveable in translation along the screw during the rotation of the latter, said housing comprising two different chambers,one for receiving the screw / nut system and the other for receiving the transmission means, said transmission means comprising in particular a movable ring integral with the screw of the screw / nut system, said movable ring having a collar on its outer periphery, intended to be abutted and centered against a shoulder formed at the junction between the receiving chamber of the screw / nut system and the receiving chamber of the transmission means.

[0022] Advantageously, the movable ring of the transmission means is thus housed and kept centered in the receiving chamber thanks to said collar.

[0023] The movable ring is integral with both the planet carrier and the screw of the screw / nut system and, thus advantageously, the nut locked in rotation in the housing is driven in translation under the effect of the rotational drive of the screw by the motor shaft.

[0024] The nut, locked in rotation in the housing, is driven in translation under the effect of the rotational drive of the screw by the means of transmitting the rotation of the motor shaft, while the positioning of the two rings against the end of the receiving chamber of the transmission means ensures a centered assembly between the motor shaft and the screw-nut system.

[0025] Therefore, during assembly, the screw-nut system, the screw of which has at its end the movable ring, is engaged in the receiving chamber of the screw / nut system of the caliper housing, with said ring which is housed in the receiving chamber of the transmission means in a centered manner thanks to the collar of the movable ring bearing against the shoulder defined between the two chambers.

[0026] The transmission means, consisting of the planet carrier, the planet gears, and the fixed ring gear, are engaged and mounted in the receiving chamber from the other end of the receiving chamber. The fixed ring gear preferably also includes a peripheral flange that is mounted against a stop in a groove formed at the periphery of the end of said receiving chamber.

[0027] According to a preferred form, the fixed ring and the moving ring are respectively engaged with their toothed inner wall on a part of the satellite gears in line with each other, their outer peripheral wall extending along the wall of the receiving chamber of the transmission means.

[0028] Since the movable ring is fixed to the screw, the collar bearing against the shoulder of the housing in the bracket is also driven in rotation; bearings are mounted between said collar and the shoulder to facilitate this drive in rotation.

[0029] Thus advantageously, this central arrangement of the movable ring attached to the screw of the screw / nut system of the actuation means and of the fixed ring simplifies the central mounting of the electric motor using the motor pinion attached to the motor shaft of the electric motor.

[0030] The means for transmitting a rotational movement from a drive pinion to the screw / nut system are also housed in said housing. These transmission means consist successively, from the drive shaft, of a drive pinion, a planet carrier, a fixed ring gear, and a movable ring gear.

[0031] According to a third object of the invention, the means for actuating the movable brake pad include the screw-nut system and at least one drive piston the movable brake pad comes in the form of a module that can be inserted into the housing provided in the caliper.

[0032] Thus advantageously, such a module consists of the screw / nut system comprising the screw engaged in the nut, said nut carrying two pistons comprising respectively a rod one end of which is fixed on an ear of the nut and the other end carries the head of the piston intended to protrude into the space between the arms of the caliper, the heads being mounted in a sealing bellows intended to be mounted in a sealing manner at the end of the housing.

[0033] The nut thus carries the two pistons, driven in translation, against the movable brake pad to exert an axial thrust on it at two distinct points of support, allowing for better distribution of this thrust, particularly when the brake pad is larger. This is made possible, in particular, by the centered mounting in said housing of the movable ring carried by the screw.

[0034] The brake according to the invention therefore has a simplified, more compact, and therefore less expensive structure allowing reliable mounting while offering a better distributed axial thrust on the moving brake pad.

[0035] According to a first embodiment, the sealing bellows has a flat portion, preferably reinforced by a metal insert, having two orifices into which the piston rods are engaged. The sealing bellows is further fixed in a hermetic manner to the periphery of the housing, closing said housing, with the piston heads resting against the outer face of said sealing bellows, protruding into the space between the arms of the caliper, the periphery of the holes being fixed in a hermetic manner to said piston heads.

[0036] According to a second embodiment, a housing closure element is provided. This closure element is mounted by form cooperation in said end of the housing and carries the sealing bellows, said closure element having two orifices corresponding to the orifices of the sealing bellows for the passage of the piston rods.

[0037] The brake according to the invention makes it possible to limit the bulk related to the interface between the motor pinion and the screw / nut system, which also makes it possible to reduce the number of parts required and, moreover, no radial force is supported by the screw and the interface, the nut behaving like a hydraulic type piston.

[0038] In addition, since two pistons are provided, better flexibility is offered for the dimensions of the brake pads.

[0039] The present invention also relates to a motor vehicle equipped with disc brakes according to the invention.

[0040] The invention also relates to a method for manufacturing a disc brake comprising a caliper having opposite each other a fixed brake pad and a movable brake pad, as well as a mechanism for actuation of the movable brake pad comprising a screw / nut system and means for transmitting a rotational movement from a drive pinion to the screw / nut system to actuate the movable brake pad, in which a through bore is made in one of the arms of the caliper to form a housing opening into the space between the arms, said housing having two receiving chambers, the screw / nut system is mounted in the receiving chamber of the housing, one end of the screw provided with a crown is connected to the means for transmitting the rotational movement of a drive pinion connected to an electric motor.

[0041] The invention will now be described in more detail with reference to the drawing in which the figures represent:

[0042] [Fig-1] a lateral perspective view of a brake according to the invention;

[0043] [Fig.2] a perspective view of a brake caliper according to [Fig.1];

[0044] [Fig.3] a view according to [Fig.2] with the electric motor mounted;

[0045] [Fig.4] a view according to [Fig.3] with the cover and fixing cap mounted

[0046] [Fig.5] a view according to [Fig.4] with the electronic control unit mounted;

[0047] [Fig.6] a view according to [Fig.5] with the protective plate mounted on the hood of covering and fixing;

[0048] [Fig.7] a partial cross-sectional view of the stirrup according to [Fig.6];

[0049] [Fig.8] a longitudinal cross-sectional view of the stapes of the [Fig.6];

[0050] [Fig.9] a perspective view of the screw-nut module according to [Fig.7].

[0051] As can be seen in [Fig.1], the invention relates to a disc brake F comprising a caliper E intended to straddle a sector of a disc D which is fixed to a vehicle wheel, for example on the hub MY.

[0052] This caliper E comprises two arms Bl, B2 defining between them a space El in which brake pads PI, P2 extend opposite each other, intended to be on either side of the sector of the disc D.

[0053] One arm of the caliper Bl, also called the nose of the caliper E, carries the brake pad f PI, fixed relative to the caliper E, while the second arm B2 carries the brake pad P2, movable relative to the caliper E, and the actuation mechanism of the movable brake pad.

[0054] The branch B2 thus includes a through bore defining a housing L in which is housed, as an actuation mechanism, a screw / nut system actuated by a geared motor M. This screw / nut system is preferably made up of a ball screw / nut assembly, comprising a screw 1, a nut 2 and balls 3 engaged in threads of the screw 1 and the nut 2.

[0055] Thus, the screw 1 and the nut 2 extend into the housing L. This housing L is divided into two chambers, one Cl is the receiving chamber of the screw / nut system and the second C2 is the receiving chamber of the means for transmitting the rotational movement from a drive shaft 4 to the screw / nut system.

[0056] The screw 1 is mounted to be driven in rotation under the effect of the geared motor M and fixed in translation while the nut 2 is mounted fixed in rotation in said housing L and movable in translation in said housing L under the effect of the drive in rotation of the screw 1.

[0057] The means for transmitting the rotational motion of a drive pinion 5 enable the rotation of the screw 1 and are, for example, successively comprised, from the drive shaft 4, of a drive pinion 5, a planet carrier comprising planet gears 8 and a fixed ring gear 6 meshing with said planet gears 8, and a movable ring gear 7, meshing with the planet gears 8 and integral with the screw L. Thus, this ring gear 7 is formed as a single piece with the screw 1, for example by forming the end of the screw L.

[0058] The satellite gears 8 located radially between the planet carrier and the ring 7 ensure the irreversibility of the movements transmitted inside the brake F.

[0059] The motor pinion 5 is fixed to the motor shaft 4, and the planetary pinions 8 mesh with the motor pinion 5 as well as the ring gear 7. The screw 1 is fixed to the ring gear 7.

[0060] Consequently, when the ring 7 is rotated by the drive pinion 5, the screw 1 is rotated. The nut 2 is held fixed in rotation within the chamber Cl of the housing L and is then driven in translation along the screw 1.

[0061] The electric motor M comprising the motor shaft 4 is contained in an open housing 10, fitted onto the arm B2 of the bracket E to assemble the motor shaft 4 with the transmission means.

[0062] The housing 10 containing the electric motor M comprises a base 11 and a peripheral skirt 12 arranged to fit onto the bracket E. The arm B2 of the bracket E preferably includes additional means for fitting the housing 10, these fitting means being constituted for example by a shoulder 131 provided at the end of the arm B2, around the end of the receiving chamber C2 of the housing L. Said peripheral skirt 12 of the housing 10 further has a radially projecting peripheral rim 14 which thus fits against the shoulder 131 provided on the bracket E when the motor M is put in place with the transmission means.

[0063] A cover and fixing hood 30 is attached to said housing 10 and fixed to the bracket E, said cover and fixing hood 30 further comprising means for receiving the electronic control unit ECU.

[0064] The cover and fixing hood 30 has a suitable shape to cover the caliper E such as an L-shape, one arm 31 of which extends along the motor M to cover and hold it and the other 32 extends above the caliper E. This shape thus advantageously allows the distribution of the various elements of the ECU and in particular to distance certain electronic elements from the electric motor M.

[0065] The hood 30 consists of two walls 31, 32 extending substantially perpendicularly to each other in an L-shape, and has lateral walls 33 extending along the two plates 31, 32, and which carry fastening means such as holes 34 for the passage of fastening screws. These holes 34 are provided in correspondence with screw holes 15 provided in the bracket E.

[0066] These side walls 33 project beyond the plates 31 and 32 and form a peripheral rim 33a defining a receiving recess 35 for the electronic control unit (ECU). This electronic control unit (ECU) is mounted on a plate which also has an L-shape, complementary to that of the cover and mounting plate 30, and which is housed in the receiving recess 35.

[0067] Once the electronic control unit ECU is in place on the hood 30, a protective plate 40 is attached to the electronic control unit ECU.

[0068] The housing L of the caliper E has two different chambers, one Cl for receiving the screw / nut system and the other C2 for receiving the transmission means, the latter chamber C2 being smaller in size than the present receiving chamber Cl, a shoulder 13 separating the said chambers Cl, C2.

[0069] The movable ring 7, having the flange 71 on its outer periphery, is thus intended to be abutted and centered against the shoulder 13 formed at the junction between the receiving chamber C1 of the screw / nut system and the receiving chamber C2 of the transmission means. In this way, the movable ring 7 is housed and held centered in the receiving chamber by means of said flange 71 abutting against the shoulder 13.

[0070] The transmission means consisting of the planet carrier, the planet gears 8 and the fixed ring 6 are engaged and mounted in the receiving chamber C2 from the other end of the receiving chamber C2. The fixed ring 6 preferably also includes a peripheral collar 61 which is mounted against the shoulder 16 formed at the end of said receiving chamber C2 by a groove 132 surrounding the opening of the chamber C2.

[0071] The fixed ring 6 and the moving ring 7 are respectively engaged with their toothed inner wall on a part of the satellite gears 8 in the extension of each other, their external peripheral wall extending along the wall of the receiving chamber C2 of the transmission means.

[0072] The movable ring 7 being fixed to the screw, the collar 71 bearing against the shoulder 13 of the housing L in the bracket E is also driven in rotation, bearing bearings 72 are mounted between said collar 71 and the shoulder 13 to promote this drive in rotation.

[0073] Thus advantageously, this central arrangement of the movable ring 7 attached to the screw 1 of the screw / nut system of the actuation means and the fixed ring 6 simplifies the central mounting of the electric motor M using the motor pinion 5 attached to the motor shaft 4 of the electric motor M contained in its housing 10, the skirt 12 of which is fitted onto the shoulder 13.

[0074] The means for actuation of the movable brake pad P2 comprising the screw-nut system and at least one drive piston 9 of the movable brake pad P2 is in the form of a module MO insertable into the housing L provided in the caliper E.

[0075] This MO module consists of the screw / nut system comprising the screw 1 engaged in the nut 2. The nut 2 is in the form of a cylindrical sleeve 21 surrounding the screw 1, and carrying two protruding lugs 22, for example diametrically opposed or placed on either side of the sleeve 21 in mirror symmetry.

[0076] The receiving chamber Cl of the housing L is thus of complementary shape and dimensions to the nut 2, having a bore and two grooves at the periphery of the bore so that the nut 2 is fixed in translation in said chamber Cl, due to the lugs 22 engaged in the grooves of complementary shape and dimensions and only driveable in translation in said chamber Cl under the effect of the rotation of the screw 1.

[0077] The nut 2 carries the two pistons 9 which respectively comprise a rod 91, one end of which is fixed on an lug 22 of the nut 1 and the other end carries the head of the piston 92. This latter end of the rod 91 is also engaged through a through orifice 41 provided in a sealing bellows 50.

[0078] This sealing bellows 50 is intended to be placed at the end of the housing L of the caliper 2 to seal said housing L, with the piston heads 92 protruding into the space El between the arms Bl, B2 of the caliper E as can be seen in [Fig.7].

[0079] This sealing bellows 50 has a flat central part 52 made rigid by means of a metal insert, and in which the through orifices are provided, this central part 52 being surrounded by a skirt 53, folded in the shape of an accordion, allowing the fixing of said bellows 50 in a closing element 60 in the form of a metal plate having passage orifices for the rods 91 of the pistons 9, the plate 60 having dimensions and a shape allowing force engagement in the end of the housing L.

[0080] The sealing bellows 50 is thus mounted in a sealed manner at the end of the housing L with the two piston heads 92 intended to protrude into the space El between the arms Bl, B2 of the caliper E, the deployment of the accordion-folded parts maintaining the fixing and the sealing.

[0081] The piston heads 92 are in contact with the movable brake pad P2. Thus, in a first direction of rotation of the screw 1, the nut 2 is driven in translation so that the pistons 9 are driven protruding into the space El and, in contact with the movable brake pad P2, to drive the latter in translation towards the fixed brake pad PI to clamp the disc.

[0082] In the opposite direction of rotation of the screw 1, the nut 2 is driven in translation and retracted in the housing L, causing the pistons 9 to retract, which separates the movable plate P2 from the fixed plate PI in the direction of loosening.

[0083] Of course, the invention is not limited to the examples just described and many modifications can be made to these examples without departing from the scope of the invention.

[0084] NOMENCLATURE F disc brake E caliper D disc MY hub Bl, B2 caliper arm El space between caliper arms PI fixed brake pad P2 moving brake pad L housing Cl receiving chamber of the screw / nut system C2 Receiving chamber for actuation means 1 screw 2 nut 21 sleeve 22 lug 3 balls 4 motor shaft 5 motor pinion 6 fixed crown 61 peripheral collar 7 crowns 71 peripheral collar 72 bearing 8 satellite pinion 9 piston 91 piston rod 92 piston head 10 cases 11 bottom of the case 12 peripheral skirt of the case 13 shoulder between the two reception rooms 131 shoulder at the end of the stirrup 132 groove surrounding the opening of the receiving chamber C2 14 edge of the case skirt 15 fixing holes 16 shoulder at the end of the receiving chamber C2 30 cover and fixing cap 31st branch of the L 32nd branch of the L 33 side wall 33a peripheral edge 34 fixing holes 35. Receiving housing for the electronic control unit 40 protective plates 50 sealing bellows 52 central part of the sealing bellows 53 skirt of the sealing bellows 60 closing element M electric motor MO module of the screw / nut system

Claims

Demands

1. Disc brake (F) comprising a caliper (E) having opposite each other a fixed brake pad (PI) and a movable brake pad (P2), and an actuation mechanism for the movable brake pad (P2) comprising a screw / nut system and means for transmitting a rotational movement from a drive shaft (4) to the screw / nut system for actuating the movable brake pad (P2), in the tightening and loosening directions, said actuation mechanism being mounted in a through-hole (L) formed in the caliper (E), an electric motor (M) and an electronic control unit (ECU) for controlling the actuation of said actuation mechanism, characterized in that the electric motor (M) is contained in an open housing (10), fitted onto the caliper (E) to assemble the drive shaft (4) of the electric motor (M) onto the transmission means,a cover and fixing cap (30) being attached to said housing (10), said cover and fixing cap (30) comprising means for receiving the electronic control unit (ECU), the cap (30) comprising fixing means cooperating with additional fixing means provided on the bracket (E) for fixing the cap (30) to the bracket (E).

2. Disc brake (F) according to claim 1, characterized in that the housing (10) containing the electric motor (M) comprises a base (11) and a peripheral skirt (12) arranged to fit onto complementary fitting means of the housing (10), these fitting means being made up of a shoulder (131) formed on the caliper (E), said peripheral skirt (12) of the housing (10) fitting against the shoulder (131).

3. Disc brake (F) according to any one of claims 1 and 2, characterized in that the cover and fixing hood (30) has a shape suitable for covering the caliper (E) such as an L-shape of which one arm (31) extends along the motor (31) to cover and hold it and the other (32) extends over the caliper (E).

4. Disc brake (F) according to claim 3, characterized in that the cover and fixing housing (30) is made up of two walls extending substantially perpendicular to each other in L-shaped, and side walls (33) extend along the two plates (31, 32), carrying fastening means such as holes (34) for the passage of fastening screws, these holes (34) being provided in correspondence with screw holes (15) provided in the bracket (E).

5. Disc brake (F) according to any one of claims 1 to 4, characterized in that a protective plate (40) is attached to the electronic control unit (ECU).

6. Disc brake (F) according to any one of claims 1 to 5, characterized in that the screw (1) of the screw-nut system is mounted fixed in translation in the housing (L) and driveable in rotation by the transmission means, while the nut (2) mounted fixed in rotation in said housing (L) is driveable in translation along the screw (2) when the latter is driven in rotation, said housing (L) having two different chambers, one (Cl) for receiving the screw / nut system and the other (C2) for receiving the transmission means, said transmission means comprising in particular a movable ring (7) integral with the screw (1) of the screw / nut system, said movable ring (7) having a collar (71) on its external periphery, intended to be abutted and centered against a shoulder (13) formed at the junction between the receiving chamber (Cl) of the screw / nut system and the receiving chamber (C2) of the transmission means.

7. Disc brake (F) according to claim 6, characterized in that the means for transmitting a rotational movement from a drive pinion (5) to the screw / nut system are also housed in the receiving chamber (C2) of the housing (L) and consist, from the drive shaft (4), of a drive pinion (5), a planet carrier, a fixed ring (6) and a ring (7), integral with both the planetary pinions (8) of the planet carrier (6) and the screw (1) of the screw / nut system.

8. Disc brake (F) according to claim 7, characterized in that the fixed ring (6) has a peripheral flange (61) which is mounted against a stop in a groove (16) formed at the periphery of the end of said receiving chamber (C2).

9. Disc brake (F) according to any one of claims 6 to 8, characterized in that the fixed ring and the moving ring are respectively engaged with their toothed inner wall on a portion of the sprockets satellites in line with each other, their outer peripheral wall extending along the wall of the receiving chamber of the transmission means.

10. Disc brake (F) according to any one of claims 1 to 9, characterized in that the means for actuating the movable brake pad comprising the screw-nut system and at least one piston (9) for driving the movable brake pad is in the form of a module that can be inserted into the housing (L) provided in the caliper (E).

11. Disc brake (F) according to claim 10, characterized in that the module (MO) consists of the screw / nut system comprising the screw (1) engaged in the nut (2), said nut (2) carrying two pistons (9) comprising respectively a rod (91) one end of which is fixed on an lug (22) of the nut (2) and the other end carries the head (92) of the piston (9) intended to protrude into the space between the arms of the caliper, the heads (92) being mounted in a sealing bellows (50) intended to be mounted in a sealing manner at the end of the housing (L).

12. Disc brake (F) according to claim 11, characterized in that the sealing bellows (50) has a flat part, preferably reinforced by a metal insert, having two orifices in which the rods (91) of the pistons (9) are engaged, the sealing bellows being further fixed in a hermetic manner on a closing plate (60) of the housing (L), this closing plate (60) being intended to be mounted by form cooperation in said end of the housing (L).

13. Motor vehicle equipped with disc brakes according to any one of claims 1 to 12.

14. A method for manufacturing a disc brake (F) comprising a caliper (E) having, opposite each other, a fixed brake pad (P1) and a movable brake pad (P2), and an actuation mechanism for the movable brake pad (P2) comprising a screw / nut system and means for transmitting a rotational movement from a drive pinion (5) to the screw / nut system for actuating the movable brake pad (P2), according to any one of the preceding claims, characterized in that a through bore is made in one of the arms of the caliper (E) to form a housing (L) opening into the space (E1) between the arms (B1, B2), said housing comprising two receiving chambers (Cl, C2), the screw / nut system is mounted in the receiving chamber (Cl) of the housing (L), one end of the screw (1) provided with a ring (7) is connected with the means of transmitting the rotational movement of a motor pinion (5) connected to an electric motor (M).

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