WO2018001583A1

WO2018001583A1 - Gear motor unit for an electrical disc brake actuator, brake and method for industrialised production and assembly

Info

Publication number: WO2018001583A1
Application number: PCT/EP2017/058055
Authority: WO
Inventors: Jérôme BERTRAND; Thierry Pasquet; Aleksander Hurwic; Nicola Tristano
Original assignee: Foundation Brakes France
Priority date: 2016-06-30
Filing date: 2017-04-05
Publication date: 2018-01-04
Also published as: FR3053422B1; FR3053422A1

Abstract

The invention relates to an electric gear motor (1, 2, 3) mounted at the end of a disc brake actuator. It comprises a cantilevered motor, parallel with the output of the reduction gear and on the same side. According to the invention, the gear motor comprises a damper (13, 23, 33) rigidly anchored to its housing and extending laterally. The damper comprises a damping material operating by friction (2320) or shear (1320, 3320). According to the embodiments, the damper absorbs vibrations of the gear motor and/or the caliper by pressing on the caliper housing (7) and/or by moving a movable mass (231) forming an inertial damper.

Description

"Gear motor group for electric disc brake actuator, brake and industrialization and assembly process"

The invention relates to an electric gear motor mounted at the end of the actuator of a disk brake. It includes a cantilevered motor parallel to the gearbox output and on the same side.

According to the invention, the geared motor comprises damper rigidly anchored on its housing and extending laterally. The damper comprises a damping material operating by friction and / or shearing. According to the embodiments, the damper absorbs vibrations of the gearmotor and / or the caliper by pressing on the caliper housing and / or by moving a moving mass producing an inertial damper.

State of the art

In the field of brakes for the automobile in general, and more particularly the disc brakes, it has become common to install an electric actuator directly on the brake. This actuator is generally used for the parking and emergency brake function, or "park brake", but sometimes also as a service brake.

Conventionally, the brake caliper comprises a screw-nut mechanism in the caliper, inside the brake piston and often in addition to its hydraulic operation, which moves the piston in translation to tighten the or pads against the disc.

In a current configuration, as illustrated in FIG. 1 and FIG. 2 for a caliper-type brake 7 sliding on clevis 8, this screw-nut mechanism is coaxial with the brake piston and receives a rotation drive by a geared motor unit 9 (or MGU for "Motor Gear Unit") whose A92 axis output is mounted coaxially on the end of the shaft of the screw-nut. The geared motor unit 19 is fixed to the stirrup 7 on an attachment plane, here by screws 701. Inside the geared motor 9, the output is driven by a gearbox (for example with external gears and / or planetary gear trains ) driven by an electric motor 91. This motor 91 is disposed in the housing of the geared motor unit 9, with its axis A91 next to the output axis A92 and parallel thereto. In this configuration, the motor exceeds the plane of fixing and extends towards the caliper, that is to say from outside the vehicle. This form of the geared motor 9 allows a small footprint, using the space available around the barrel 71 of the stirrup, that is to say the part of the stirrup 7 which contains the brake piston and in general the screw mechanism. nut.

Such an electric geared motor, however, has disadvantages, especially in terms of vibration. These vibrations stem inter alia from the operation of the electric motor. They also come from the shaking due to the road, which are all the more important as the brake and the geared motor are part of the unsprung masses of the vehicle.

The vibrations are a source of discomfort for the occupants of the vehicle, directly or by the noises they cause. They can also be a source of reliability problems, for example fatigue, loosening or wear. In addition, the vibrations cause or facilitate spontaneous movements of the braking pads, which can thus come into contact with the disk and cause undesired braking. In particular, the vibrations can facilitate and accentuate such advancement of the pads towards the disc, combining with a suction resulting from the boundary layer of the air driven in rotation per disc when it rotates.

In addition to possible additional noises, such unwanted braking has undesirable consequences and in particular fuel consumption, the resulting additional pollution, as well as wear of the disk and skate pads, which also creates pollution. .

An object of the invention is to overcome all or part of the disadvantages of the state of the art. In particular, it is desired to reduce or absorb the vibrations present in the brake and in particular the geared motor. These objectives are sought while minimizing the optimization of the tradeoffs between costs, reliability, ease of manufacture and assembly, and flexibility of adaptation to a different vehicle model or specification. Presentation of the invention

The invention proposes an electric geared motor device for a disc brake caliper, intended to be coupled to a disc brake caliper for driving, within said caliper, a translational mechanism of at least one braking pad. This geared motor is of the type comprising a self-supporting housing enclosing an electric motor and a mechanically connected reduction mechanism for outputting said gear a rotational drive along an output axis. This casing is arranged to be fixed on the end of a caliper drum, that is to say the part of the caliper body which surrounds the brake piston, by a fixing interface which surrounds said output shaft. The electric motor is disposed with its axis of rotation next to and parallel to the output axis. Advantageously, (which includes an optional character) this motor is disposed in a portion of the geared motor housing which extends along said caliper shaft. Typically, this part of the housing surrounding the motor protrudes beyond the attachment interface, parallel to and in the same direction as the output axis of said geared motor.

Such a geared motor architecture is very conventional because it is quite compact and remains close to the plane of the wheel, which limits interference with the rest of the vehicle and with the obstacles of the road.

Advantageously the motor is a brushless type ("brushless" in English terminology) controlled by vector control by a computer. Its reducer can include different types of mechanisms, sometimes a gear train with external contacts but usually at least one epicyclic train to provide a large reduction in a small volume, to optimize the power and thus the size of the engine.

The portion of the geared motor forming the outlet often has a substantially cylindrical shape which encloses the epicyclic gear train, in the extension or even the continuity of the caliper drum, the thickness (ie its transverse dimension to the stroke of the piston ) is itself conditioned by the diameter of the brake piston and the screw-nut mechanism that it contains. The general shape of the geared motor is therefore often that of two parallel cylinders joined together by their end on the side opposed to the stirrup, that is to say comprising a cylinder enclosing the electric motor and a cylinder enclosing the epicyclic gear train.

According to the invention, this geared motor is characterized in that it comprises at least one damping device rigidly anchored on the housing of the geared motor, and which extends laterally with respect to said axes. This damper is integral with the frame and / or gearbox housing, preferably integral with him but possibly also fixed on him.

This damper is arranged for example according to a known type of operation. As it is understood, being fixed to the geared motor housing, this damper makes it possible to reduce the movements of said geared motor housing, in itself and / or between itself and the bracket on which it is fixed. It is more particularly optimized for this purpose.

According to one feature, this damper extends, by its orthogonal projection on the plane of the two axes of motor and output, in a position between these two axes.

Preferably, this damper extends outwardly of the geared motor housing; and for example only to the outside.

Preferably, the shock absorber is located, for the majority of its projected surface parallel to the axis of the motor and the output axis, preferably for more than 75% and for example 100%, inside of a volume located between the plane of said axes and the two so-called "tangent planes" defined as being:

on the one hand tangent to the geared motor housing in its part surrounding the motor, and

- On the other hand tangent to the gearbox housing in its portion surrounding the output shaft (which may include the fixing or clamps) or tangent to the caliper drum.

These types of arrangements make it possible to move the damper away from the casing, and thus potentially improve its efficiency, while only slightly exceeding this main volume of space, which is typical of a geared motor with this type of architecture. . It is thus possible to limit or avoid modifying the implementation of the geared motor and the shape of the stirrup and the yoke, compared to existing models.

According to some embodiments, the damper is anchored to, and extends laterally from, the geared motor housing in its motor housing portion, ie which surrounds the electric motor and extends along the shaft. stirrup, which portion is typically of generally cylindrical shape. This extension is preferably but not necessarily in a direction perpendicular to the axis of said electric motor. According to an optional feature, this extension extends from a cantilever portion of the motor housing.

In many configurations, such an arrangement can allow an action applying directly to the vibrations of the engine and its housing part, which are often the most important, and thus contribute to optimize the effectiveness of the damper.

In embodiments where the damper is arranged on the engine, according to an advantageous feature of the invention, the geared motor comprises a part which carries the damper and forms a cover fixed so as to surround the geared motor housing in its part. extending along the caliper shaft or closing its end on the motor side.

This cover-damper is for example fixed to the assembly of the geared motor unit, and can be provided of several types for the same main housing. According to a feature, this cover is further arranged to be assembled on the main housing in different angular positions.

This architecture thus makes it possible to produce several versions of the complete geared motor on the same electromechanical basis and therefore with a small additional cost. There may be several different types for different vehicle models, or several different types each corresponding to a different side of the vehicle, for example one for the brakes on the right side and the other for the brakes of the vehicle. left side of the vehicle. According to a family of embodiments of the invention, called dampers with support, the damping device comprises at least one contact portion which is anchored to the extension of the geared motor housing and is arranged to bear against or be anchored to a part of the caliper housing (or even the yoke) when the geared motor is mounted on said caliper.

According to some embodiments operating by support, the contact portion is formed of a rigid material, which is connected to the rest of the gearmotor by a deformable portion where the damping occurs. The deformable part is for example made by a thinning of the rigid material. The damping is then done by a damping material which is integral with the rigid material on both sides of this deformable part, and thus absorbs part of the energy of this deformation.

In other embodiments of this family, alternatively or in combination, said contact portion then comprises a damping material, or is anchored to the geared motor housing through such damping material, thereby realizing a shock absorber by transmission with the caliper.

According to a feature, this support is simply by pressing on the housing of the caliper, for example created by the clamping during attachment of the geared motor housing on the caliper, preferably in its portion forming the caliper drum.

According to another feature, alternatively or in combination, this support is carried out also or in addition by a fixing device, for example by a complementary cooperation of shapes, with or without local clamping. This is for example a pawn (for example worn by the damper) engaged in a housing (for example formed in the caliper, during manufacture or during assembly of the geared motor); and / or a shrink-type engagement such as a dovetail. This fastening device is made for example with the shape of the stirrup as existing for the mounting of a geared motor according to the prior art, or comprises for example a specialized part such as a form or a leg carried by the stirrup, manufacturing or in the form of a later insert for mounting the geared motor according to the invention. According to another family of embodiments of the invention, so-called inertial dampers, the damping device comprises at least one flyweight which is fixed to or embedded in the extension anchored to the geared motor housing by means of a damping material, for example completely free, ie without being connected to anything else.

This damping material is chosen to provide energy absorption during its deformation, thereby providing a drummer or inertial mass damper for one or more determined frequencies, for example to achieve a modal damping.

This type of inertial damper can for example be determined at design to be tuned with one or more specific frequencies to be absorbed, to achieve a modal damping, for example determined for a specific model of brake or vehicle or subset of vehicle, or a combination thereof, for example to specifically target one or more defects previously noted.

It should be noted that these two families of dampers, by support and inertial, relate to the mode of operation of the damper but can be combined together for example with a damper having two parts operating differently. For example geometrically separated such as two different extensions, but also in the same part such as a support connection which one of the parts of the support chain includes a more or less suspended mass portion forming a flyweight to provide an inertial damping .

For all types of geometry and operation, and combinations thereof, the invention contemplates different types of damping materials, including all those known to those skilled in the art, particularly in the automotive field.

In a type of so-called frictional embodiments, the damping material comprises a plurality of elements compressed together so as to form an assembly whose deformation causes friction in said compressed elements. This is for example two pieces movable between them and supported on one another, for example by clamping, the relative movement generates friction, with or without local clamping.

According to an advantageous feature, the friction damping material comprises an agglomeration of fibers or wires held together providing enhanced friction by multiplication of the friction surfaces and / or support forces between them, for example as envisaged in FIG. This maintenance is preferably carried out without a binder, for example by compression or by interlace, especially agglomerated or compressed or interlaced or intermingled or knitted wire, or a combination of these characteristics.

In another type of so-called inertial embodiments, possibly combined with the friction type, the damping material comprises a viscoelastic flexible material whose deformation generates shear absorption of said material internally and / or at its anchoring surface. , in particular an amorphous or composite material consisting of or based on plastomer or elastomer or a mixture of said materials. It is typically a non-rigid material and preferably has significant viscoelastic characteristics, for example specifically chosen and / or adjusted according to the damping characteristics referred, amplitude and / or frequency.

According to an advantageous feature, the shear damping material is anchored to rigid portions interposed or interdigitated or intertwined with each other, and is inserted or distributed between them for example by casting or injection. Such shearing effect "reinforced" work surface is obtained for example according to the methods disclosed by the document EP 1 568 913.

This shear damping material is for example glued to, or compressed between, or embedded in rigid parts belonging to the extension of the geared motor housing, when the damping material is directly in abutment against the stirrup.

It is also, for example, glued or compressed or embedded between: on the one hand rigid parts belonging to the geared motor housing, and others rigid parts belonging to the contact part which bears on or attached to the stirrup.

The invention is here exposed and illustrated for a sliding caliper disc brake, but is also provided for a fixed caliper disk brake. It is also intended for other types of brake, such as a drum brake, since the general shape of the geared motor and its axes allows it.

According to yet another aspect, the invention proposes a method of optimizing a geared motor or brake of an existing model, or of adapting said geared motor or brake to a specific model of vehicle, characterized in that it includes the following steps:

for a given geared motor mounted on a given brake and / or on a given vehicle, determination of a frequency to be absorbed, by physical tests or numerical simulation;

according to said frequency, calculating one or more geometrical parameters and / or material defining a damper to be anchored on said geared motor to produce a geared motor according to as set forth herein.

The position of the damper is advantageously chosen so that the damping is as effective as possible according to the most harmful vibrations, to be eliminated in priority, and then so as to minimize the mass and / or quantity of material to add to the gearmotor to form this damper.

It should be noted that a symmetrical arrangement of the damper of the geared motor is not beyond the scope of the present invention.

The invention thus makes it possible to optimize a geared motor and / or an existing brake, for example to improve it or to adapt it to a new brake or to a new vehicle or subassembly of a vehicle.

According to another aspect, the invention provides a method of manufacturing or assembling a geared motor or a brake as described herein, characterized in that it comprises the following steps:

- manufacture or assembly of a geared motor unit of a specific type; - depending on the version of the brake or geared motor to be produced, for example according to the vehicle model or the left or right side of the vehicle, choice:

o of a type of damper to be anchored to said geared motor for producing a geared motor as described here, especially in the form of a cover adapted to close the housing of the geared motor in its end surrounding the motor side of the caliper, and or

o a position in which to fix such a damper on said geared motor; and

- Fixing said gear motor of a damper of said selected type and / or in said selected position, in particular by ultrasonic welding in the case of a housing and / or plastic damper. According to another aspect, the invention proposes a vehicle disc brake, characterized in that it comprises an electric actuator including a geared motor group as described here; or a vehicle or subassembly of a vehicle comprising such a brake. Various embodiments of the invention are provided, integrating, according to all of their possible combinations, the various optional features set forth herein.

List of Figures

Other features and advantages of the invention will emerge from the detailed description of an embodiment which is in no way limitative, and the appended drawings in which:

FIG. 1 and FIG. 2 are scale views illustrating a sliding disc brake caliper brake in its version on the left side, equipped with an electric geared motor unit and mounted on a wheel motor, according to the state of the art:

o in FIGURE 1, end view along the axis of the brake piston from inside the vehicle, shown with the rim, and o FIGURE 2, in perspective, shown without the rim and during tightening of the fastening screws;

FIG. 3 is a scale-scale perspective view which illustrates, in its version on the left-hand side, with the caliper and the brake clevis of FIGURE 1, a first exemplary embodiment of the invention. invention comprising a geared motor unit provided with an elastomer shear damper carried by the cover of the electric motor and operating by bearing on the caliper;

FIGS. 4a and b illustrate in scale perspective the cover with brake damper of FIG. 3, in a global view from inside the cover, and respectively in detail of the damper;

- FIGURE 5 is an end view along the axis of the electric motor, which illustrates the scale of the geared motor unit of FIGURE 3, mainly in the left version;

FIGURE 6 is an end view from the inside of the vehicle which shows the scale of the brake of FIGURE 3 mounted on a non-driving wheel;

FIGURE 7 is a scaled perspective view illustrating, in its left side version, with the brake caliper and clevis of FIGURE 1, a second exemplary embodiment of the invention. invention comprising a geared motor unit provided with a free mass damper, carried by the cover of the electric motor and operating by reinforced friction;

FIGURE 8 is a perspective view in scale which illustrates the geared motor unit of the second embodiment in its right side version;

FIGURE 9 is an end view from the inside of the vehicle which shows the scale of the brake of FIGURE 7 mounted on a non-driving wheel;

FIGS. 10a and b illustrate to scale the cover with brake damper of FIG. 7, in end view along the axis from the inside of the cover, and respectively in transparent perspective of a sagittal section passing through the shock absorber; FIGURE 10c illustrates a variant of the cover of FIGURE 7 in which the weight carries a connecting pin with the stirrup;

FIGURE 11 is a scale-scale perspective view which illustrates, in its left side version, with the brake caliper and brake yoke of FIGURE 1, a third exemplary embodiment of the invention. invention comprising a geared motor unit provided with an interdigitated elastomer shear damper carried by a lateral arm protruding from the assembly plane and operating by pressing on an arm of the yoke;

FIGURE 12 is an end view along the axis of the electric motor, which illustrates to scale the geared motor unit of FIGURE 11, mainly in the left version;

FIGURE 13a is a partial sectional view from below which illustrates the structure of the interdigitated ribs of the damper of FIGURE 12;

FIGURE 13b is a partial schematic view according to section A-A of FIGURE 12, which functionally illustrates the inner structure of the damper according to a deformable damper feature; FIGURE 13c is a view in section A-A illustrating an exemplary embodiment of the damper of FIGURE 13b;

FIGURE 13d is a view according to section A-A which illustrates an exemplary embodiment of the damper of FIGURE 12 in a variant with contact by the damping material;

FIGURE 14 is a scale perspective view illustrating the geared motor assembly of FIGURE 11 shown alone; and

FIGURE 15 is a scale perspective view illustrating the brake of the third embodiment in its right side version.

State of the art

FIG. 1 and FIG. 2 illustrate an example of a clevis-sliding caliper disc brake, in its version on the left-hand side, equipped with an electric geared motor unit 9 and mounted on a non-driving wheel 62, according to the state of the art. . On one side of the caliper shaft 71, the trough 7 has arms 78 which extend in opposite directions to sliding columns 72, to which it is fastened 70 by caliper fixing screws. These columns hold the stirrup 7 sliding on the yoke 8, which is fixed 80 on the fixed part 81 of the half-train, whose hub carries the wheel 62 and the disc 6.

Note that, as is common, this geared motor has a symmetrical outer shape around the plane containing the axis A91 of the motor 91 and the axis A92 of the output mechanism, which is coaxially coupled in rotation to a screw-nut mechanism contained in the hydraulic piston of the caliper and enclosed by the caliper drum 71. Due to this symmetry, the same model of geared motor 9 can be mounted indifferently on a left brake or a right brake, which have between them a different shape and for example symmetrical. Description of Examples of Embodiments

First exemplary embodiment

FIG. 3 to FIG. 6 illustrate, in its version on the left side, a first exemplary embodiment of the invention comprising a geared motor unit 1 provided with a shock absorber 13 with an elastomer shear 1320, carried by the cover 130 of the invention. electric motor 11 and operating by pressing the caliper. This geared motor is shown here mounted on a stirrup 7 and its fork 8 of an existing brake, here that of FIG. 1.

As can be seen, the general external shape of the geared motor 1 according to the invention is similar to that of the geared motor 9 of FIG. 1. It has for example a similar or identical internal mechanism. It has an output and coupling mechanism 122, as well as a fastening plane P70 provided with fastening screw flanges 701, which are compatible with the same stirrup 7, or even exactly identical with those of the geared motor 9. It is thus possible to use this geared motor 1 according to the invention with an existing stirrup and clevis, within an existing brake model, and thus improve its vibration behavior while minimizing the necessary changes and constraints that go with . In this example, the damping device 13 comprises a cover 130 which closes the housing of the gear motor on the motor side and carries a rigid extension tab 131 whose shape has a hollow advantageously crossed rigid ribs 1311 interdigitated between them which are embedded by a damping material 1320 shear.

As illustrated in FIGURE 4a and b, the receiving housing of the damping material advantageously comprises at least one opening 1321 of said extension 131 allowing the deformation of the extension by the vibrations of the casing to be damped. The vibrations transmitted by the support P73 of the extension on the stirrup deform the extension into two mutually movable parts, thus deforming the damping material which unites them, which thus absorbs the energy of these vibrations.

In this example, as illustrated in FIG. 5, this contact portion 132 is formed by the face of the damper which is directed towards the stirrup, and is arranged to bear P73 against the stirrup shaft 71, here on a shoulder 73 of the stirrup 7 which projects radially beyond the base of the barrel 71.

This support P73 is made in a direction parallel to the clamping direction of the fixing interface P70, 701, under the effect of the clamping of the geared motor 1 on the mounting plane P70 of the caliper. In this example, the clamping direction is parallel to the output shaft 12 of the geared motor and to the axis of the motor, and directed towards the disk 6 under the effect of the screws 701.

Alternatively or in combination, the damping material is accessible through this opening, or it extends through and beyond this opening to form all or part of the contact part by interposing between the extension and the stirrup .

As illustrated in FIGURE 4b, a small diameter opening 1312 is present in one of the inner plastic walls 1311 of the damper so as to provide an elastomeric bridge which holds the material 1320 in its captive position within the the damper. This opening 1312 is for example made by drilling after molding, which allows to keep an unwrapped form for the ribs 1311 and the general shape of the part 130 carrying the damper 13. In FIGURE 5 is illustrated the arrangement of the damper 13, whose extension is located, for the majority of its projected surface parallel to the axes Ai l and A12, inside a volume V130 whose print is here represented in phantom. This volume is delimited on each side of the plane of said axes and the two tangent planes T130, here represented by a thin phantom line which is tangent to the external volumes of the motor part 11 and the attachment 701 of the outlet part 122, of gearbox 1.

In this figure is illustrated the geared motor 1 in its version for one side, here the left brake. The shape of the geared motor is different in its version for the opposite side, and is here illustrated by its damper 13 'shown in dashed lines. As can be understood, the same cover 130 can be mounted on the same gearbox base housing in different positions. In this example, a first angular position (pointing to the right in FIGURE 5) gives a gearmotor in the left version, while a second angular position (in dotted lines, pointing to the left in FIGURE 5), gives a gearmotor in a straight version. .

As can be seen in FIG. 6, the left geared motor 1 can be mounted on the same stirrups 7 and clevis 8 as the geared motor 9 of the prior art (FIGURE 1), provided that the right version of the geared motor is selected, here the version left.

In the example illustrated here, the support P73 on the stirrup 7 is here made directly by contact of the damping material 1320 on the metal of the housing of the stirrup.

In other variants not detailed here, the damper further comprises a so-called moving rigid part, for example of the same material as the rest of the cover, which is fixed to the geared motor housing only through the material of amortization. It is then the moving part that is supported on the caliper housing, or even attached to it.

This mobile part carries for example so-called mobile ribs which are interdigitated with those said fixed that integral with the lid. The damping material is disposed between the fixed ribs and the movable ribs and anchored to it, so as to transmit the vibrations of the gear motor between them by absorbing them by shearing.

Second exemplary embodiment

FIGURE 7 to FIGURE 10 illustrates a second exemplary embodiment of the invention which will only be described in its differences. This example is here illustrated in its left version, except for FIGURE 8 which represents the right version, with a damper 23 'in a different and symmetrical position.

This embodiment comprises a geared motor unit 2 provided with an inertial damper 23, carried by the cover 230 of the electric motor 11 and / or operating by reinforced friction. Again, the geared motor 2 is shown mounted on a yoke 7 and its yoke 8 of an existing brake, here that of FIG. 1.

As can be seen, the geared motor 2 is of the same shape as, and for example identical to the geared motor 1 of FIGURE 3, outside its cover 230 with damper 23. It thus has the same advantages of adaptability to existing brakes.

In this example, as shown in more detail in FIGURE 10b, the damping device comprises a feeder 231m which is embedded in a damping material 2320, itself inserted into a hollow of the extension 23 of the cover 230 of the electric motor. 11.

A drummer or inertial mass damper is thus obtained whose mass, friction and geometry characteristics are chosen so as to tune it to one or more determined frequencies whose absorption is more specifically sought.

In this example, the damping material 2320 is made of an agglomerate of metal wires intermingled and compressed together. Once compressed in its housing, this agglomerate is possibly covered by a holding resin, or even partially embedded in a cast resin, injected or deposited after compression.

In the example illustrated in FIGURE 7, the damper 23 does not touch the caliper housing and thus functions only as an inertial damper. In a variant shown in FIG. 10c, the weight 231m has a portion forming a rigid piece (or integral with it), such as a pin 2321, which protrudes towards the casing of the caliper 7. This rigid piece is supported by on the housing 7, or even lodge in support in a bore made on its surface. The feeder 231m is thus mechanically connected to the housing, in a rigid manner or with a certain friction according to the fit and the method of fixing the rigid part 2321 on the housing. The damper then works by combination of inertial damping and damping by support / transmission.

As can be seen in FIG. 9, the left geared motor 2 can be mounted on the same stirrups 7 and clevis 8 as the geared motor 9 of the prior art (FIGURE 1), provided that the right version of the geared motor 2 is selected according to FIG. invention, here the left version.

In this example, the same cover 230 can be used with the same base housing to give the left version or the right version of the geared motor 2, according to the angular position in which they are assembled.

Third exemplary embodiment

FIGURE 11 to FIGURE 15 illustrate a third exemplary embodiment of the invention.

This embodiment comprises a geared motor unit equipped with an interdigitated elastomer shear damper, carried by a lateral arm protruding from the assembly plane and operating by pressing on an arm of the yoke. Again, the geared motor 3 is shown mounted on a yoke 7 and its yoke 8 of an existing brake, here that of FIG. 1.

This example is here illustrated in its left version, except for FIGURE 15 which represents the right version, with a damper 33 'in a different and symmetrical position.

The geared motor 3 has a shape similar to the geared motor 1 of FIG. 3. It thus has the same advantages of adaptability to existing brakes.

In this example, the damping device 33 comprises a tab 331 which extends laterally away from the housing of geared motor 3 perpendicular to the plane of its axes Ai l and A12. This tab carries a damping material, here by shear, which comprises a bearing portion 332 arranged to bear against the caliper housing 71. Advantageously, the bearing surface 332 forms a ramp ensuring contact with stirrup. In this example, the damper 33 presses P73 on one of the arms 78 of the stirrup 7, in a direction parallel to the clamping direction of the attachment interface P70, 701, which direction is here parallel to the axis A12 output 12 of the gearmotor and axis Ai l of the motor.

In this example, the tab 331 protrudes from the gearmotor housing in an anchoring region located at the attachment plane P70 of the geared motor, which brings it substantially to the level of the arm 78. This anchoring region is here located in the central portion of the geared motor housing, between the two axes of the gearmotor, but could also be shifted towards one or the other, for example at the motor shaft Ai l. The tab 331 has an arcuate shape, and ends in an orientation substantially perpendicular to the arm 78.

As illustrated in FIGURE 13a, at its end, it carries a hollow traversed by stiff ribs 3311 interdigitated between them, which are embedded by a damping material 3320 shear, for example an elastomer. One of the ribs 3311 has an orifice 3312, for example pierced after manufacture of the housing, through which an elastomer bridge is formed which secures the damping material 3320 to the remainder 331 of the damper 33.

In the example illustrated in FIG. 13b and FIGURE 13c, the contact portion is anchored to the geared motor housing via a deformable part 331D, here formed by a narrowing of the section of the tab 331 under the effect of FIG. a bleed 3321a in the side walls of the damper. This deformable portion 331D separates the damper into a substantially fixed portion 331 F relative to the tab 331, and a substantially movable portion 331M which comprises the contact portion 332. The damping material 3320 is disposed between these two fixed portions 331 F and mobile 331M, glued to them and drowning their ribs 3311. The contact portion 332 here forms an inclined ramp which abuts P73 on the caliper, causing a compression P731 damping material. The vibrations of the geared motor are thus transmitted to the contact portion 332 and therefore to the stirrup through the damping material, which dissipates a portion of their energy by compression and shear.

In a variant illustrated in FIG. 13b, said contact portion 332b itself comprises the damping material. This damping material 3320 protrudes from its recess towards the gearmotor, over a certain thickness between the lug 331 and the stirrup arm 78, by a shaped outlet opening 3321 in the walls of the recess. This protrusion forms the contact portion 332b, which is thus pressed by the tab 331 against the stirrup arm 78, in a direction parallel to the clamping direction of the fixing interface P70, 701, here parallel to the axis output 12 of the geared motor and axis Ai l of the motor.

In FIGURE 12 is illustrated the arrangement of the damper 33, which is anchored and extends, by its orthogonal projection on the plane of the two axes of motor and output, in a position between these two axes Ai l and A12. This figure illustrates the geared motor version for the left side, while dashed lines located on the other side illustrates the position of the damper 33 'for a geared motor version for the right side.

FIG. 15 illustrates the version for the right side, mounted on a stirrup 7 'and a clevis 8' corresponding to the same brake in its specific version for the right side of the vehicle.

According to a variant not detailed here, the tab forming the damper is integral with the part 11 of the geared motor housing which surrounds the motor, and can be mounted on the other part 12, 122 of the geared motor housing in two angular positions. different, each giving a different version of the geared motor, for example a left and a right. Of course, the invention is not limited to the examples that have just been described and many adjustments can be made to these examples without departing from the scope of the invention. Nomenclature

I geared motor unit (MGU) left version

I I MGU electric motor

12 reducer MGU

122 output part of the MGU

13, 13 'shear damper (left position, right position)

130 shock absorber cover

131 extension and damper walls

1311 damping ribs

1312 elastomer holding port

132 shock absorber contact part

1320 shear damping material

1321 discharge port of damping material

2, 2 'gearmotor (MGU) left version, right version

23, 23 'inertial friction damper (left position, right position)

230 shock absorber cover

231 extension and damper walls

231m fender weight

2320 friction damping material

2321 rigid link between flyweight and caliper housing - pawn

3, 3 'geared motor (MGU) left version, right version

33, 33 'shear damper by support (left position, right position)

331 pawl and damper walls

331D deformable part of the shock absorber

331F, 331M fixed and movable parts of the shock absorber

3311 damping ribs

3312 elastomer holding port

332 shock absorber contact part 3320 shear damping material

3321a bleeding reduction of the stiffness of the shock absorber

3321b outlet port of damping material

6 brake disc

61 brake pad

62 wheel rim

7, 7 'brake caliper left, right

70 caliper mounting on column

701 fixing of MGU on the stirrup

71 bow stirrup

72 columns

73 caliper shaft shoulder

P73 damper support on the caliper

P731 compression of the shock absorber under the effect of the ramp

78 caliper arms

8, 8 'left brake clevis, right

80 screed fixing on half-train

9 geared motor (MGU) according to the state of the art

91 electric motor (state of the art)

Al the engine axis of the MGU

A12 output axis of the MGU

A91 electric motor shaft (state of the art)

A92 output axis of MGU (state of the art)

P70 mounting plane of the MGU on the caliper

T130 plane tangent to the MGU cylinders

V130 interior volume to the main clutter of the MGU

Claims

1. Device (1, 2, 3) of electric geared motor for disc brake caliper, intended to be coupled to a disc brake caliper (7) for driving, within said stirrup, a translation mechanism of at least brake shoe (61)

said geared motor comprising a self-supporting housing (20) enclosing an electric motor (11) and a reduction mechanism (12) mechanically connected to output at the output of said gear a rotation drive along an output axis (A12),

said casing being arranged to be attached to the end of a caliper shaft (71) by an attachment interface (P70) which surrounds said output shaft (Ai 1),

said electric motor being disposed with its axis of rotation (Ai l) adjacent to and parallel to the output axis (A12),

said geared motor being characterized in that it comprises at least one damping device (13, 23, 33) rigidly anchored to the geared motor housing and extending laterally with respect to said axes (Ai l, A12), so as to dampen the movements of said geared motor housing (20) relative to the stirrup (7).

2. Gearmotor according to the preceding claim, characterized in that the damper (13, 23) is located, for the majority of its projected area parallel to the axes, within a volume (V130) defined between the plane of said axes and two planes (T130), said tangent planes, defined as being each:

- On the one hand tangent to the geared motor housing in its portion (11) surrounding the motor, and

- On the other hand tangent to the geared motor housing in its portion (122) surrounding the output axis or tangent to the stirrup shaft (71).

3. Gearmotor according to claim 1, wherein the geared motor housing surrounds the electric motor in at least a portion (11) extending cantilevered in the same direction as the outlet of the gearbox (12), said geared motor being characterized in that the damper (13, 23) is anchored to and extends laterally from the gearbox housing in its cantilevered part (11) which surrounds the electric motor and extends along the stirrup shaft (71).

4. Gearmotor according to the preceding claim, characterized in that it comprises a part which carries the damper (13, 23) and forms a cover (130, 230) fixed so as to surround the geared motor housing in its part. extending along the caliper shaft (71) or closing its end on the motor side (11).

Gearmotor according to one of the preceding claims, characterized in that the damping device (13, 33) comprises at least one contact part (132, 332) which is anchored to the extension (13, 33). of the geared motor housing and is arranged to bear against or be anchored to a part of the housing of the stirrup (7) when the gearmotor is mounted on said stirrup, and in that:

said contact portion comprises a damping material, and / or is anchored to the geared motor housing by means of such damping material, and / or

- Is anchored to the geared motor housing by means of a deformable portion which is integral with such a damping material arranged to dampen its deformation;

thereby achieving a transmission damper with the caliper.

6. Gearmotor according to any one of the preceding claims, characterized in that the damping device (23, 23 ') comprises at least one feeder (231m) which is fixed to or embedded in the extension (231) anchored on the gearmotor housing by means of a damping material (2320) chosen to provide energy absorption during its deformation, thereby providing a drummer or inertial mass damper for one or more determined frequencies.

7. Gearmotor according to any one of claims 5 or 6, characterized in that the damping material comprises a plurality of elements compressed together so as to form an assembly whose deformation generates a friction in said compressed elements.

8. Gearmotor according to the preceding claim, characterized in that the damping material comprises an agglomeration of fibers or son held together, without binder or with a binder that coats less than 50% of the surface of said fibers or son, including wire agglomerated or compressed metal or interlaced or intermingled or knitted or a combination thereof.

9. Gearmotor according to any one of claims 5 to 8, characterized in that the damping material comprises a flexible material whose deformation generates a shear absorption of said material internally and / or its anchoring surface, in particular an amorphous or composite material consisting of or based on plastomer or elastomer or a mixture of said materials.

10. Gearmotor according to the preceding claim, characterized in that the damping material is anchored to and distributed between rigid portions interposed or interdigitated between them.

11. Gearmotor according to any one of claims 9 to 10, characterized in that the damping device (13) comprises a cover (130) which closes the housing of the gear motor on the motor side and carries an extension bracket ( 131) rigid whose shape has a hollow traversed rigid ribs (1311) interdigitated between them which are embedded by a damping material (1320) shear,

and in that said damping material protrudes through at least one opening (1321) of said extension (131) to form the contact portion (132), which is arranged to bear against the caliper shaft ( 71) in a direction parallel to the clamping direction of the fixing interface (P70, 701).

12. Gearmotor according to any one of claims 9 to 11, characterized in that the damping device (33) comprises a tab

(331) which extends laterally of the geared motor housing (3), which carries a hollow traversed by rigid ribs (3311) interdigitated between them which are embedded by a damping material (3320) shear,

and in that said damping material projects through at least one opening (3321) of said extension (331) to form the contact portion

(332), which is arranged to bear against the caliper housing (71) in a direction parallel to the clamping direction of the attachment interface (P70, 701).

13. A vehicle disc brake, characterized in that it comprises an electric actuator including a geared motor unit according to any one of the preceding claims.

14. A method of optimizing a geared motor or brake of an existing model, or adaptation of said geared motor or brake to a specific model of vehicle, characterized in that it comprises the following steps:

according to said frequency, calculating one or more geometrical parameters and / or material defining a damper to be anchored on said geared motor to produce a geared motor according to any one of claims 1 to 12.

15. A method of manufacturing or assembling a geared motor according to any one of claims 1 to 12 or a brake according to claim 13, characterized in that it comprises the following steps:

manufacture or assembly of a geared motor unit (1) of a specific type;

- depending on a brake version or geared motor to be made, choose: o a type of damper (13, 33) to be anchored to said geared motor for producing a geared motor according to any one of claims 1 to 12, and / or

o a position in which to fix such a damper on said geared motor; and

- Fixing said gear motor of a damper of said selected type and / or in said selected position.