Reducer for drum brakes offering outstanding applicability

Abstract

A reduction motor for a parking brake mechanical actuator (7) for a drum brake, the reduction motor comprising an electric motor (21) and a reduction box (32), the electric motor comprising an output shaft (24) extending along a first axis, the reduction box comprising an output shaft extending along a second axis, wherein the reduction box (32) comprises stepped tangentially meshing spur gears (34, 35, 36, 37, 38), each stepped gear comprising a gear and a coaxial pinion, which are rotatably stacked and fixed to each other, and the stepped gears (34, 35, 36, 37, 38) are installed to be rotatable around mutually parallel axes (AX34, AX35, AX36, AX37, AX38).

Description

Technical Field

[0001] The present invention relates to the field of automotive vehicle brakes, and more particularly to a geared motor assembly for operating a shoe of a drum brake to provide reduced overall size. Background Art

[0002] In the automotive industry, the function of an electromechanical parking brake is to stop a stationary vehicle in order to prevent it from moving unexpectedly. In addition, an electromechanical parking brake meets the legal requirements for a second brake system in the vehicle that is independent of the usual hydraulic service brake system and implements further comfort and safety functions, in particular through its self-diagnostic capability.

[0003] It is known from document FR3016015 that, in addition to the hydraulic actuator initially provided, a mechanical actuator can also be installed in a drum brake. Figure 1 The drum brake, marked with 1, comprises a back plate 2 rotating around an axis AX, which is provided with a first arcuate shoe 3 and a second arcuate shoe 4 which are radially movable so that the arcuate shoe can be pressed against a cylindrical inner surface (not shown) of a drum member.

[0004] The shoes 3 and 4 each have a connecting plate 3a, 4a made of a flat metal plate in the form of a circle section, which carries the brake linings 3b, 4b and is mounted radially opposite to each other, with the ends of the shoes bearing on a hydraulic wheel cylinder 6 and a mechanical actuator 7 carried by the back plate 2. These shoes 3 and 4 are further biased toward each other by two return springs 8 and 9 and are pressed against the back plate 2 by springs 10, 11 respectively.

[0005] The wear winding rod 12 extends along the wheel cylinder 6 , and has a first end portion supported on the connecting plate 3 a of the first shoe 3 and a second end portion supported on the connecting plate 4 a of the second shoe 4 .

[0006] When using the drum brake 1, the wheel cylinder 6 is actuated according to a first operating mode, called "single", which provides progressive braking particularly suitable for braking a vehicle in motion. The wheel cylinder comprises a hydraulic chamber closed at its ends by two pistons which move apart and push the relative ends of the shoes 3 and 4 when the hydraulic pressure increases.

[0007] The mechanical actuator 7 in turn provides parking and emergency braking by moving the relevant ends of the shoe apart, in order to provide a fast and powerful locking of the wheels of the vehicle according to the so-called "double servo" operating mode, in particular when the wheel cylinder 6 is inoperative. The actuator is actuated by an electric motor 21 having an axis AY.

[0008] Indeed, one of the difficulties associated with the use of mechanical actuators is the need to convert the high rotation speeds associated with the low torque of the electric motor into a low displacement with sufficient load. To this end, document FR3016015 teaches the provision of a reduction module that transmits the rotation of the motor 21 to the mechanical actuator 7, more precisely the rotation of the axis AY motor pinion directly actuated by the motor. The reduction module is centered on the axis AY and comprises a plurality of steps of an axis AY planetary gear train so as to provide an effective reduction between the output measured at the axis AY output gear coupled to the mechanical actuator 7 and the input measured at the motor pinion. Furthermore, the motor 21 and the reduction module are housed together in a cylindrical housing.

[0009] The combination of the motor 21 and the reduction module requires that the axis of the motor be arranged parallel to the axis of the planetary gear train and the axis of the reduction module be arranged parallel to the axis of the toothed wheel of the mechanical actuator 7. This results in a large overall size of the geared motor.

[0010] However, the available space at the wheel is relatively small. Furthermore, the space varies greatly in size and shape depending on the vehicle model. Therefore, it is desirable to have a geared motor with a small overall size to facilitate integration of the geared motor into different vehicle models. Summary of the invention

[0011] It is therefore an object of the present invention to provide a geared motor, for example for actuating a parking brake of a drum brake, having an architecture enabling it to adapt to available spaces of varying shapes and sizes.

[0012] The above object is achieved by a gear transmission motor having an externally contacted gear train, the gear train comprising stepped gears. Each stepped gear comprises a pinion and a toothed wheel, the pinion and the toothed wheel are coaxial and rotatably stacked on each other as a whole, the pinion of one stepped gear meshes with the toothed wheel of an adjacent stepped gear. The axes of the pinion and the toothed wheel are parallel to each other.

[0013] By advantage of the invention, the arrangement of the stepped gears relative to one another is relatively free. The general shape of the reduction gearbox can then be adapted to the configuration of the available space. In practice, the reduction gearbox can have a relatively rectilinear shape, a curved shape or even an S-shape, for example. The structure of such a reduction gearbox thus offers some freedom in choosing the external shape of the geared motor.

[0014] Furthermore, advantageously, the reduction box can be relatively thin and flat in the direction of the axis of the pinion and the toothed wheel. Therefore, the reduction box can be arranged in a small space.

[0015] In one example, the axis of the electric motor is parallel to the axis of the gear and toothed wheel. In a particularly advantageous example, the axis of the motor intersects the axis of the stepped gear and an angular transmission connects the motor to the reduction gearbox. The motor can then be arranged as a continuation of the gear train and the geared motor can provide a shape that is even easier to integrate.

[0016] In other words, a reduction module is produced comprising a series of pinions and toothed wheels, advantageously formed by stepped gears, which can be deployed in a variety of shapes to adapt to the geometry of the available space.

[0017] Therefore, a subject of the present invention is a gear-driven motor for a mechanical parking brake actuator of a drum brake, which gear-driven motor includes an electric motor and a reduction gearbox, the electric motor including an output shaft extending along a first axis, the reduction gearbox including an output axis extending along a second axis, the reduction gearbox including tangentially meshing stepped gears, each stepped gear including a toothed wheel and a pinion, the toothed wheel and the pinion are coaxial and rotatably stacked on each other into one body, and the stepped gears are mounted to be rotatably movable around axes parallel to each other.

[0018] Preferably, the reduction gearbox comprises only stepped gears.

[0019] Advantageously, the stepped gears are at least partially alternating so that the geared motor has an overall substantially flat shape.

[0020] The reduction gearbox may include a plate, and the shaft may be integral with the plate, about which shaft the stepped gear is mounted rotatably and movably.

[0021] In an exemplary embodiment, the plate comprises at least two parts arranged in different parallel planes.

[0022] Advantageously, the geared motor comprises a housing comprising a first portion forming a bottom and a second portion forming a cover, the plate being arranged in the bottom of the housing.

[0023] For example, the reduction gearbox includes between four and six stepped gears.

[0024] In one exemplary embodiment, the output shaft of the electric motor is orthogonal to the axis about which the stepped gear is rotatable.

[0025] Preferably, the geared motor has an angular transmission comprising a crown gear between the output shaft and the reduction gearbox.

[0026] The output axis of the reduction gearbox may be parallel to the shaft about which the stepped gear is freely rotatably mounted.

[0027] Another subject of the invention is a drum brake comprising a drum, a back plate, two shoes, a mechanical actuator attached to the back plate and a geared motor according to the invention.

[0028] Preferably, the geared motor is mounted on the back plate so that the shaft, about which the stepped gear is freely rotatably mounted, is parallel to the axis of the drum.

[0029] Another subject of the invention is also a method for producing a geared motor according to the invention, comprising:

[0030] - manufacturing a plate and a shaft integral with the plate,

[0031] -A stepped gear is mounted around the shaft,

[0032] - providing a housing comprising a bottom and a cover,

[0033] - installing the plate equipped with the stepped gear in the bottom of the housing,

[0034] - Install the cover of the receiving portion.

[0035] Another subject of the invention is a method for producing an electromechanically actuated drum brake, comprising:

[0036] -Manufacturing of drum brakes,

[0037] - manufacturing a geared motor according to the manufacturing method according to the invention,

[0038] - the geared motor is mounted so that the stepped gear at the output of the reduction gearbox drives the toothed wheel of the mechanical actuator via an angular transmission,

[0039] - Attach the geared motor to the back plate of the drum brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The invention will be better understood using the following description and accompanying drawings, in which:

[0041] Figure 1 is a perspective view of a drum brake with an electric parking brake actuator according to the prior art.

[0042] Figure 2A is a perspective view of a drum brake equipped with a geared motor according to an exemplary embodiment of the present invention, without showing a drum and a cover of a geared motor accommodation portion.

[0043] Figure 2B yes Figure 2A Perspective view of a brake in which the mechanical actuator is visible as well as the angular transmission between the reduction gearbox and the mechanical actuator.

[0044] Figure 3 FIG. 2 is a detailed view of the angle transmission at the motor output.

[0045] Figure 4 yes Figure 3 Side view of the angular transmission.

[0046] Figure 5 A perspective view of the geared motor and drum brake mounted on a vehicle chassis, with the drum omitted.

[0047] Figure 6 is a perspective view of a drum brake equipped with a geared motor according to another exemplary embodiment of the present invention, without showing a drum and a cover of a geared motor accommodation portion. DETAILED DESCRIPTION

[0048] exist Figure 2A and Figure 2B In it can be seen a perspective view of an advantageous example of a geared motor MR1 according to the invention in connection with a drum brake 1 comprising an electric parking brake actuator 7 .

[0049] The geared motor MR1 includes an electric motor 21 and a transmission module or reduction box 32 .

[0050] In the example shown, the electric motor 21 and its output shaft 24 extend along an axis AY, and the output axis of the transmission module 32 extends along an axis AZ orthogonal to the axes AY and AZ.

[0051] In this example, the transmission module is intended to extend parallel to the backplane 2 .

[0052] The kinematic chain of the transmission module is in the form of a so-called compound reduction, in which the gear elements are in the form of a linear train of stepped gears in external contact, preferably the number of stepped gears being four to six. Figure 2A and Figure 2B In the example of FIG. 3 , there are five stepped gears 34 , 35 , 36 , 37 and 38 .

[0053] The stepped gears 34, 35, 36 and 37 respectively comprise a first step in the form of a toothed wheel 34a, 35a, 36a, 37a and a second step in the form of a pinion 34b, 35b, 36b, 37b, which are rigidly connected to the corresponding toothed wheel and have a smaller diameter than the corresponding toothed wheel. The gear 38 comprises a toothed wheel 38a and a ring gear 38b.

[0054] The stepped gears 34, 35, 36, 37 and 38 are each arranged to be rotatably mounted around a different fixed axis AX34, AX35, AX36, AX37 and AX38, each of which is parallel to one another and arranged in a sequence along the reduction direction, i.e. from the motor pinion to the mechanical actuator 7. In particular, the dimensions of these stepped gears are such that the pinion forming the output of one gear meshes with the toothed wheel of the next gear, the toothed wheel 34a forming the input element of the kinematic chain, and the pinion 38b forming the output element of the chain. The physical axes AX34, AX35, AX36, AX37 and AX38 are described by the geometric axes.

[0055] The implementation of the reduction box in the form of a stepped gear train also offers great freedom in the form that the reduction box can adopt. In fact, the relative arrangement of the axes of the stepped gears is free, only the distance between the axes being set to ensure tangential meshing of the pinion and the toothed wheel. As a result, the gear train can have a more or less extended shape and can therefore be optimally adapted to the available environment around the wheel. In the example shown, the axes of the gears are arranged approximately along a circular arc, and this circular arc can have a larger or smaller radius of curvature. In fact, the gear train can be more or less unwound while maintaining the reduction ratio. In other exemplary embodiments, the gear axes are arranged along an S-curve or along a straight line.

[0056] Furthermore, the implementation of stepped gears enables the length of the reduction chain and therefore the protrusion of the motor to be reduced, which could be detrimental to the operation of the geared motor and therefore to the brake in the long term.

[0057] However, a transmission module comprising a single toothed wheel and pinion meshing with a stepped gear does not depart from the scope of the present invention.

[0058] Furthermore, one or more idler wheels may be added to the reduction chain without changing the reduction ratio, for example to lengthen the reduction chain in order to further offset the motor.

[0059] Very advantageously, and as Figure 2A and Figure 2B As shown, some or all of the stepped gears are alternating. Figure 2A In the embodiment of the present invention, the pinions 35b and 37b are on the same side as the toothed wheel 36a. This allows the reduction gearbox to be relatively flat and thin, so that the reduction gearbox can be more easily integrated along the drum. For example, the thickness of the geared motor is between 1 cm and 8 cm, preferably between 1.5 cm and 5 cm, more preferably between 2 cm and 3 cm, for example 2.5 cm.

[0060] exist Figure 5In the figure, a geared motor can be seen housed between the back plate 2 of the drum brake and the chassis C of the automotive vehicle, to which it is attached. It should be noted that the flat and elongated shape of the geared motor enables it to be housed in a narrow space and further enables the motor to be arranged in a wider area for receiving the motor. Advantageously, the reduction gearbox according to the invention enables the motor to be offset relative to the mechanical actuator of the drum brake. As mentioned above, this offset can be adjusted, for example, by extending the reduction chain by inserting one or more idler wheels into the reduction chain.

[0061] Advantageously, the axes AX34 to AX38 are connected to Figure 6 The stepped gear rotates around an axis which is integral with a single plate 53 visible in the figure, and the plate is mounted in the bottom of a housing 54 which houses the gear train. The axis is perpendicular to the plate. For example, the axis is made in one piece with the plate 53 by molding, or the axis is made of metal material and overmolded in a plastic material plate or the axis is assembled to a plastic material plate. Preferably, the plate 53 is made of metal plate, advantageously of steel.

[0062] In an exemplary embodiment, the shaft is integral with the housing, in which case there is no implementation of a plate.

[0063] In the example shown, the plate comprises two parts 53.1 and 53.2 extending in two parallel planes. Axes AX34 and AX35 are attached to part 53.1, and axes AX36, AX37 and AX38 are attached to part 53.2. This multi-plane arrangement may be achieved by the freedom provided by the meshing of the pinion and the toothed wheel along the axis direction of the stepped gear. The possibility of distributing the axis in multiple parallel planes provides additional freedom to adapt the shape of the reduction box to the environment. In fact, if the environment requires a housing with one or more grooves, the plate 53 can be shaped to follow these grooves without changing the reduction characteristics of the stepped gear chain. In one example, the plate comprises three parts, two parts in one plane, and another part in a different plane parallel to the plane of the two parts and connecting the two parts.

[0064] The reduction gearbox according to the invention offers a great freedom of shape in a plane orthogonal to the axis of the gear and also in the direction of the axis of the stepped gear.

[0065] The embodiment of a single plate has the advantage that the reduction chain can be prefabricated and can be easily installed in the housing.

[0066] Very advantageously, the housing contains the motor and the reduction gearbox, which simplifies the assembly and sealing procedures of the geared motor. In the example shown, the housing consists of two parts, a first part 54.1 comprising a bottom against which a plate 53 bearing the axis of the stepped gear rests, and a second part 54.1 forming a cover. Very advantageously, the bottom 54.1 contains the motor and the reduction gearbox, and the cover 54.2 covers the motor and the reduction gearbox.

[0067] exist Figure 2A and Figure 2B In the example of the embodiment of the present invention, the bottom has a groove. The shape of the cover can also be adapted to the environment and / or the contour of the gear.

[0068] The first portion and the second portion may be symmetrical about a plane passing through a connection region between the first portion and the second portion.

[0069] Advantageously, the housing is made by moulding a plastic material.

[0070] Advantageously, the housing 54 comprises means 56 for attaching the geared motor to the drum brake, more specifically the reduction box to the back plate, in order to limit the movements of the geared motor that could damage the geared motor and / or generate undesirable noises. For example, the means 56 for attaching the geared motor to the back plate comprise screw holes 58 passing through the housing 54 along the X direction outside the gear and in which screws are to be mounted, the screws cooperating with corresponding holes provided in the back plate.

[0071] Advantageously, the screw hole 58 forms means for positioning the plate relative to the bottom 54.2 of the housing. In the example shown, the screw hole comprises a tube made of the same material as the bottom 54.2 of the housing, and a notch 60 is formed in the outer edge of the plate 53. The notch receives the tube of the screw hole.

[0072] Alternatively, different means for positioning the screw holes may be considered.

[0073] Very advantageously and as Figure 2A and Figure 2B As shown, the axis of the electric motor is orthogonal to the axis of the stepped gear and therefore extends in a plane continuously with the shape of the gear train. The geared motor then has a shape capable of following the peripheral edge of the drum around the axis. In this example, the geared motor MR1 has a first angular transmission 44 connecting the motor 21 and the transmission module 32 and a second angular transmission 46 connecting the output of the transmission module and the actuator 7.

[0074] Advantageously, the first angular transmission 44 is an angular transmission of the crown gear type and comprises a pinion 25 meshing with a flat toothed wheel 34a and a crown gear 34a. The pinion 25 engages with the output shaft 24 of the electric motor 21 .

[0075] The crown gear 34a has a wheel with teeth forming a ring on one side of the wheel. Figure 3 In FIG. 1 , it can be seen that the crown gear is shown separately.

[0076] The angular transmission with crown gear offers the advantage of providing freedom in the orientation of the axis of the pinion 25 relative to the axis of the crown gear 34a, i.e. a great freedom in choosing the angle of the angular transmission. In practice, the angle α between the AX34 axis and the AY axis can vary from 30° to 135°. This offers a wide range of options for the orientation between the motor and the transmission module, in order to adapt the shape of the geared motor to the shape of the available space. Furthermore, the requirements on the mounting precision are reduced.

[0077] In addition, the position of the teeth of the pinion 25 relative to the teeth of the crown gear 34a can be varied. Figure 4 , the meshing length Le corresponds to the length of the area where the teeth of the pinion engage with the teeth of the crown gear 34a. The pinion 25 can be arranged with a clearance j relative to the crown gear. The clearance j is between + / -1 / 100 mm and + / -10 mm, advantageously between + / -1 / 10 mm and + / -5 mm, preferably between + / -1 mm and + / -3 mm, even more preferably between + / -2 mm.

[0078] This assembly clearance made possible by the crown gear helps to provide greater freedom in the arrangement of the various elements of the geared motor. The requirements on mounting accuracy are also more relaxed.

[0079] In addition, the angular transmission with crown gear provides 97% to 99% efficiency. In contrast, the efficiency of the angular transmission with bevel gear is about 30% lower than that of the angular transmission with crown gear.

[0080] Advantageously, in the example shown, the second angular transmission also has a crown gear. The toothed wheel 38a driven by the pinion 37b has a crown gear on one of its surfaces, namely on Figure 2A and Figure 2B The upper surface shown carries a pinion 38b which meshes with a toothed wheel 50 of a transmission 52 which transmits the rotation of the geared motor to the actuator 7. The transmission 52 comprises wheels 48, 50 having parallel axes.

[0081] Pinion 38b comprises a toothed ring. Pinion 38b and toothed wheel 48 form the crown gear of the second angular transmission of the actuator.

[0082] In the example shown, the transmission 52 comprises a toothed wheel 48 and a toothed wheel 50 which move apart a piston supported on the end of the brake shoe and away from the piston towards the drum.

[0083] According to one alternative, the first angular transmission and the second angular transmission are cone-angle transmissions. According to another alternative, one of the angular transmissions is an angular transmission of the crown gear type and the other is a cone-angle transmission.

[0084] exist Figure 6 In FIG. 1 , another example of a geared motor MR2 according to the invention can be seen, which includes an angular transmission 46 only at the output section. In this example, the output shaft of the electric motor directly drives the toothed wheel 34a. The reduction in speed of each meshing toothed wheel / pinion pair is adapted so that the total reduction is as desired. In fact, in this example, relative to Figure 2A and Figure 2B The example in removes one deceleration step.

[0085] In another example not shown, the toothed wheel at the output directly meshes with the teeth of the toothed wheel of the actuator. In this case, the axis of the stepped gear is orthogonal to Figure 2A and Figure 2B The axis of the stepped gear in.

[0086] The geared motor according to the invention can thus be easily integrated into wheel spaces of a wide range of shapes and sizes and can thus be applied to different vehicle models. Since the shape of the geared motor can be changed by changing the relative arrangement of the stepped gear axes without changing the characteristics of the reduction gearbox, for example without changing the reduction ratio provided by the reduction gearbox, the geared motor can be adapted to a given space relatively easily. This adaptation does not require time-consuming and expensive new developments.

[0087] Reference numerals

[0088] 1: Drum brake

[0089] 2: Back panel

[0090] 3: First hoof

[0091] 4: Second hoof

[0092] 3a, 4b: Brake connecting plate

[0093] 3b, 4b: Brake linings

[0094] 6: Hydraulic wheel cylinder

[0095] 7: Mechanical actuator

[0096] 8, 9: Return spring

[0097] 10, 11: Lateral spring

[0098] 12: Worn winding rod

[0099] 21: Electric Motor

[0100] 24: Output shaft

[0101] 25: Small gear

[0102] 32: Gearbox

[0103] 34; 35, 36, 37, 38: Stepped gears

[0104] 34a, 35a, 36a, 37a, 38a: Toothed wheels

[0105] 34b, 35b, 3.6b, 37b, 38b: Pinion 44: First angle transmission device

[0106] 46: Second angle transmission device

[0107] 48: Transmission

[0108] 50, 52: Toothed wheel of transmission device

[0109] 53: Board

[0110] 53.1, 53.2: Parts of the board

[0111] 54: Accommodation

[0112] 54.1: The first part of the receiving portion

[0113] 56: Means for attaching a geared motor to a plate

[0114] 58: Screw hole

[0115] 60: Notch

[0116] AX, AY: axis

[0117] AX34, AX35, AX36, AX37, AX38: Axles of gears 34, 35, 36, 37, 38

[0118] C: Chassis

[0119] Le: Engagement length

[0120] MR1, MR2: geared motors.

Claims

1. A drum brake, comprising a drum, a back plate (2), two shoes (3, 4), a mechanical parking brake actuator (7) attached to the back plate (2), and a geared motor for the mechanical parking brake actuator (7) of the drum brake, the geared motor comprising an electric motor (21) and a reduction gear box (32), the electric motor comprising an output shaft (24) extending along a first axis, the reduction gear box comprising an output axis extending along a second axis, wherein: The reduction box (32) has tangentially meshing stepped gears (34, 35, 36, 37, 38), each stepped gear including a toothed wheel and a pinion, the toothed wheel and the pinion are coaxial and rotatably stacked on each other, the stepped gears (34, 35, 36, 37, 38) are installed to be rotatably movable around axes (AX34, AX35, AX36, AX37, AX38) parallel to each other, wherein the geared motor is mounted to the back plate (2) so that the axes (AX34, AX35, AX36, AX37, AX38) are parallel to the axis of the drum, and the stepped gears (34, 35, 36, 37, 38) are installed to be freely rotatable around the axes.

2. The drum brake according to claim 1, wherein: The reduction box (32) only includes stepped gears (34, 35, 36, 37, 38).

3. The drum brake according to claim 1 or 2, wherein: The stepped gears are at least partially alternating such that the geared motor has an overall substantially flat shape.

4. The drum brake according to claim 1 or 2, wherein: The reduction gearbox (32) comprises a plate (53), wherein the shaft (AX34, AX35, AX36, AX37, AX38) is integral with the plate (53) and the stepped gears (34, 35, 36, 37, 38) are mounted freely rotatably around the shaft.

5. The drum brake according to claim 4, wherein: The plate (53) comprises at least two parts (53.1, 53.2) arranged in different parallel planes.

6. Drum brake according to claim 4, the geared motor comprising a housing (54) comprising a first portion forming a bottom and a second portion forming a cover, the plate (53) being arranged in the bottom of the housing (54).

7. The drum brake according to claim 1 or 2, wherein: The reduction box (32) includes four to six stepped gears (34, 35, 36, 37, 38).

8. The drum brake according to claim 1 or 2, wherein: The output shaft of the electric motor (21) is orthogonal to the shaft (AX34, AX35, AX36, AX37, AX38), and the stepped gears (34, 35, 36, 37, 38) are rotatable around the shaft.

9. Drum brake according to claim 8, the geared motor having an angular transmission (44) comprising a crown gear between the output shaft and the reduction gearbox (32).

10. The drum brake according to claim 1 or 2, wherein: The output axis of the reduction gearbox (32) is parallel to the shaft (AX34, AX35, AX36, AX37, AX38), and the stepped gears (34, 35, 36, 37, 38) are mounted so as to be freely rotatable around the shaft.

11. The drum brake according to claim 1 or 2, wherein: The axis of the electric motor is orthogonal to the output axis of the reduction gearbox.

12. A method for manufacturing a geared motor for a drum brake according to claim 4, the method comprising: - manufacturing said plate (53) and said axes (AX34, AX35, AX36, AX37, AX38) integral with said plate, - mounting the stepped gears (34, 35, 36, 37, 38) around the axes (AX34, AX35, AX36, AX37, AX38), - providing a receiving portion (54) comprising a bottom (54.1) and a cover (54.2), - installing the plate (53) equipped with the stepped gears (34, 35, 36, 37, 38) in the bottom (54.1) of the housing (54), - Mounting the cover (54.2) of the housing (54).

13. A method for making an electromechanically actuated drum brake, the method comprising: - manufacturing a drum brake comprising a drum, a back plate (2), two shoes (3, 4), a mechanical parking brake actuator (7) attached to the back plate (2), - manufacturing a geared motor according to the method according to claim 12, - mounting the geared motor so that the stepped gear at the output of the reduction gearbox drives the toothed wheel of the mechanical parking brake actuator via an angular transmission and so that the shaft (AX34, AX35, AX36, AX37, AX38) around which the stepped gears (34, 35, 36, 37, 38) are mounted freely rotatably is parallel to the axis of the drum, - Attaching the geared motor to the back plate of the drum brake.

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