FR3067426A1 - DRUM BRAKE COMPRISING AN ELECTRIC DRIVE DEVICE OF AN IMPROVED MOUNTING PARKING BRAKE ACTUATOR - Google Patents

Abstract

Drum brake comprising: - a plate (4) having a passage (15), - a parking brake actuator mounted on the plate (4) and comprising a housing, said housing having a lateral opening and being mounted on the plate ( 4) so that the lateral opening of the housing is aligned with the passage (15) of the plate (4), - a driving device of the parking brake actuator (10), - a mounting element (16) of the device. driving on the plate, the mounting element (16) comprising a housing (18) receiving the driving device and an opening (22), the mounting element (16) being secured to the plate (4) by securing means with bayonet so that the opening (22) is aligned with the passage (15) of the plate (4), - two braking segments, - a drum.

Description

DRUM BRAKE COMPRISING AN ELECTRIC DRIVE DEVICE OF AN IMPROVED PARKING BRAKE ACTUATOR

DESCRIPTION

TECHNICAL AREA AND PRIOR ART

The present invention relates to a drum brake comprising an electric parking brake drive device whose mounting on the plate is improved.

In most modern automobiles, the service brake is provided by disc brakes and / or drum brakes.

They provide the service braking function, aimed at slowing down or even stopping, the motor vehicle, the parking or parking brake function aimed at bringing a stationary vehicle to a halt and the emergency brake function generally obtained with the parking brake system.

It is common to equip the front axle with disc brakes and the rear axle with drum brakes. In this configuration, the parking brake function is performed by the drum brakes.

The application of parking braking is in most cases obtained by pulling on a lever arranged in the passenger compartment which is connected to a mechanism located in the drum brake by means of a brake cable. The mechanism tends to spread the braking segments of the drum brakes to apply them against the drums.

A drum brake has

- a plate intended to be fixed on a rocket carrier,

- a drum, mounted for rotation relative to the plate, which is intended to be carried by a wheel,

- two braking segments, of curvature corresponding to a radius of the drum, which is mounted mobile on the plate between an inactive position in which they are returned towards the axis of the drum with a determined clearance relative to the drum, and an active position in which they bear radially against the drum,

- a hydraulic wheel cylinder interposed between the two braking segments at one of their two ends,

- a fixed point located at the other end of the braking segments. The fixed point is for example formed by a stop plate riveted on the plate.

When the service braking is activated by supplying the wheel cylinder with pressurized fluid, the braking segments move away in the direction of the drum by pressing on the fixed point.

When the parking brake is activated, a lever arranged between the two segments near the wheel cylinder separates the two segments which bear on the fixed point.

This operating mode is called "simplex".

There is also another operating mode for a drum brake, called a duo servo, in which the actuator spreads one end of a first segment. It rests on the drum while its other end is floating and is supported by a floating rod on the second segment by its opposite end, also floating. The other end of the second segment is thus the only one to bear on a stop plate. This mode is much more effective. A duo servo type drum brake is sometimes used exclusively as a parking brake, for example by using the inside of the central bell of a disc which acts as a service brake as a drum, a combination called Drum in hat ”.

It has also been proposed to produce a drum brake which would operate as a service brake in simplex mode and as a parking brake in duo servo mode, as for example described in the document FR3013408. The fixed point is formed by an actuator which is only activated in parking braking. The actuator can be activated electrically.

The document WO2015 / 101485 describes a drum brake comprising an actuator driven by a geared motor to achieve a “duo servo” operating mode in parking braking.

The actuator is mounted on one face of the drum brake plate carrying the brake shoes and the wheel cylinder used in service braking, and the gearmotor is mounted on the opposite face of the plate substantially in line with the actuator . A transmission assembly transmits the drive from the gearmotor to the actuator.

The gearmotor is secured to the plate by means of a housing. The housing is fixed to the plate by rivets or screws, and the actuator is also fixed to the plate by rivets or screws. However, the use of rivets or screws has the effect of locating the stresses and therefore of weakening the drum brake in particular, when the actuator serves as a fixed point in simplex operating mode.

STATEMENT OF THE INVENTION

It is therefore an object of the present invention to provide a drum brake in which the fixing of the brake actuator and the drive device on the plate is improved, in particular in which the fixing of the brake actuator and the drive device on the plate limits the concentration of stresses that can weaken the drum brake.

The object stated above is achieved by a drum brake comprising a plate, at least one braking segment, at least one parking brake actuator, an actuator drive device and a mounting device for the drive on the plate, the actuator and the drive device being mounted on either side of the plate, in which the actuator and / or the mounting element of the drive device is or are fixed on the plate by one or more bayonet connections.

Preferably, it is the mounting element which is fixed on the plate by a bayonet connection. The mounting element comprises for example a male part and the plate comprises a female part.

Very advantageously, a locking of the bayonet connection is provided to avoid any separation, for example due to vibrations. This locking can be ensured by mounting the actuator on the plate, the latter being advantageously riveted on the plate.

The present invention therefore relates to a drum brake comprising:

- a tray with a through passage,

- At least one parking brake actuator mounted on a first face of the plate, the actuator comprising a housing in which is mounted a drive assembly, said housing comprising a lateral opening giving access to the drive assembly, the case being mounted on the tray so that the lateral opening of the case is aligned with the passage of the tray,

- a device for driving the parking brake actuator,

- a mounting element for the drive device on a second face of the plate, the mounting element comprising a housing at least partially receiving the drive device, a first opening opening into said housing for mounting said at least one part of the drive device in the housing, and a second opening, the mounting element being mounted on the plate so that the second opening is aligned with the passage of the plate,

- at least one braking segment,

- a drum,

- a transmission between the actuator and the drive device.

The mounting element and / or the actuator housing is or are secured to the plate by bayonet fastening means.

For example, the bayonet fastening means comprise a female part carried by the contour of the passage of the plate and a male part carried by the contour of the second opening of the mounting element and / or the lateral orifice of the housing of the actuator.

Advantageously, the drum brake includes means for locking bayonet connection means.

In an exemplary embodiment, the mounting element or the actuator housing is secured to the plate by a bayonet connection, the locking means comprise at least a first shape carried by the contour of the passage of the plate, at least a second shape carried by the contour the second opening of the mounting element or the contour of the lateral opening of the actuator housing, said first and second shapes being aligned in the direction of an axis of the passage of the plate, and at at least a third form carried by the contour of the lateral opening of the actuator housing or the second opening of the mounting element, said third form being housed in the first and second aligned forms and locking the bayonet connection.

The contour of the passage of the plate can comprise two first diametrically opposite forms, the contour of the second opening of the mounting element or the lateral orifice of the actuator housing can comprise two second diametrically opposite forms and the contour of the lateral opening of the actuator housing or the second opening of the mounting element may comprise two third diametrically opposite shapes.

For example, the first and second shapes are recesses and the third shape (s) are ears.

In an advantageous example, the drum brake comprises means for aligning the first and second shapes.

For example, the alignment means comprise at least one radial face carried by the contour of the second orifice of the mounting element or the contour of the lateral opening of the actuator housing and an angular stop carried by the contour of the passage, said radial face coming into contact with the angular stopper by rotation of the mounting element or of the actuator housing relative to the plate, the relative angular arrangement of the radial face and the angular stopper being such that when they come into contact, the first and second shapes are substantially aligned along the axis of the passage.

The male part can be carried by the contour of the second opening of the mounting element; the third forms can be carried by the contour of the lateral opening of the actuator housing, and the actuator housing can be secured to the plate by riveting and / or screwing.

In an advantageous example, the drive device comprises an electric motor.

The drum brake can comprise a hydraulic wheel cylinder intended to apply said at least one braking segment to the drum under service braking.

The present invention also relates to a method of manufacturing a drum brake according to the invention, comprising the steps:

a) introduction of the contour of the second opening of the mounting element or that of the lateral opening of the actuator housing axially in the passage of the plate,

b) rotation of the assembly element or of the actuator housing around the axis of the passage of the plate,

c) fixing of the actuator housing or of the assembly element, for example by riveting or screwing

d) mounting of the braking segment on the plate,

e) mounting the drive device in the mounting element.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be better understood on the basis of the description which follows and of the appended drawings in which:

FIG. IA is a perspective view from behind of the drum brake according to the invention of a face of a plate intended to be fixed to a rocket carrier,

FIG. 1B is a perspective view of the face of the drum brake, opposite to that visible in FIG. 1A,

FIG. 2A is a sectional view of a drum brake plate comprising a mounting element of a drive device according to the invention and a mounting support for an actuator according to the invention,

FIG. 2B is a sectional view of the drum brake plate of FIG. 2A from a point of view opposite that of FIG. 2A,

FIG. 3 is a cross-sectional view of two different extruded bars intended for the manufacture of the mounting elements of FIGS. 2A and 2B,

FIG. 4 is a cross-sectional view of two identical extruded bars intended for the manufacture of mounting elements according to another exemplary embodiment,

FIG. 5A is a side view of the first opening of the mounting element according to another exemplary embodiment,

FIG. 5B is a view of the element in FIG. 5A, looking along the arrow F1,

- Figure 6A is a top view of the housing of an actuator adapted to the mounting element of Figure 5A

FIG. 6B is a view of the box of FIG. 6A, looking along arrow F2,

FIG. 7 is a view of an example of a plate suitable for fixing the mounting element of FIG. 5A and of the box of FIG. 6A,

FIGS. 8A to 8E are representations of different stages of mounting the mounting element and the housing of FIGS. 5A and 6A on the plate of FIG. 7.

DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS

In FIGS. 1A and 1B, a dual-mode drum brake 2 can be seen in an exemplary embodiment of the invention.

The drum brake 2 comprises a drum (not shown) integral in movement with the wheel (not shown), a plate 4 which is intended to be fixedly mounted on a stub axle, two braking segments 6, 7 mounted on a first side 4.1 of the plate 4 and movable relative thereto, a wheel cylinder 8 fixed on the first face 4.1 of the plate 4 between the braking segments and intended to apply the braking segments 6, 7 against the drum. The plate has an X axis.

The wheel cylinder is for example of the hydraulic type

The braking segments 6, 7 each have an arc shape whose convexity is oriented towards the outside and their outer surfaces intended to come into contact with the drum under the action of the braking actuator are provided with a gasket G6, G7.

The drum brake also includes a parking brake actuator 10 generally intended to keep the vehicle stationary when it is parked. It is generally activated when the vehicle is stationary. The actuator 10 is fixed on the first face 4.1 of the plate.

In service brake mode, the braking torque is created by absorption of energy under the effect of friction between an inner surface of said drum, and on the other hand the friction linings G6, G7 carried by the segments 6, 7.

This friction is likely to be obtained by spreading the segments outwards under the effect of the wheel cylinder 8. From the rest position or from the parking braking position, this first actuator 8 thus brings the mechanism into position. service braking, and the return to the rest position is achieved for example by return springs connecting together the two segments. In this example, the drum brake is arranged to operate in simplex mode when it is actuated as a service brake.

In the example shown, the wheel cylinder has two opposite pistons, each of which actuates one of the segments 6, 7 by spreading their two ends opposite one another 6.1, 7.1, c ' that is to say those located on the same side of the axis of rotation X, here called movable ends and located at the top of Figure IB. At its opposite end 6.2, 7.2, called the abutment end, each segment is supported on the plate 4 by an anchoring element secured to the plate, and thus forming a stop for this segment. The anchoring element at least partially transmits the braking torque between segments and plate. The anchoring element of the two segments is produced by the actuator 10.

The actuator 10 extends along an axis Y1 perpendicular to the axis X of the plate and parallel to the plate. It comprises a housing 12 fixed on the plate 10 on the side of the first face 4.1. The housing includes a housing formed by a through bore extending along the Y axis and opening at the two longitudinal ends of the housing

12. A drive assembly is housed in the bore. In the example shown, the housing 12 has a flat face 12,1 bearing against the first face 4.1 of the plate 4.

The drive assembly is for example of the screw-nut type such as that described in application W02015 / 101485, It comprises two support elements 13 intended to form a fixed point for the ends 6.2, 7.2 of the braking segments 6 , 7 respectively in service braking, and in applying a force on the ends 6.2, 7.2 in parking braking by being moved towards the outside of the housing along the axis Yl.

The drum brake also comprises a drive device 14 for the actuator, fixed on the side of a second face 4.2 of the plate opposite to the first face 4.1 on the side of which the actuator 10 is mounted.

The drive device 14 is preferably an electric motor which may or may not be associated with a reduction gear.

A passage 15, visible in FIGS. 2A and 2B, is made through the plate 4 to allow the transmission of the drive from the drive device 14 to the drive assembly of the actuator 10.

The drive device 14 is secured to the plate 4 by means of a mounting element 16 fixed on the plate 4. The mounting element 16 comprises a body in which is formed a housing 18 comprising a first opening 20, through which at least part of the drive device 14 is introduced, in particular the output of the drive device intended to drive the drive assembly.

The housing 18 has in the example shown the shape of a cylinder of revolution of axis Y2 parallel to the axis Yl.

The axis of the first opening is preferably also the axis Y2, allowing the motor to be mounted parallel to the plate. As a variant, for example, the axis of your first opening 20 could be oriented perpendicular to the plate, the motor axis being perpendicular to the plate.

In the example shown, the drive device 14 is centered in the mounting element 14 and is fixed thereto by means of screws 19 which pass through two ears of the housing of the drive device and are screwed into two ears of the mounting element. Reverse mounting is possible, i.e. the screws pass through the ears carried by the mounting element. As a variant, it is possible to envisage using a rod system guaranteeing the impossibility of dismantling part of the parking brake device.

In addition, the body has a second opening 22 opening into the housing 18 and intended to open opposite the passage 15 of the plate 4 when the mounting element 16 is fixed on the plate 4, this second opening 22 allowing the passage of a transmission between the drive device 14 and the drive assembly.

The axis of the second opening 22 is preferably perpendicular to the axis of the first opening 20.

The planar face 12.1 of the housing has a through lateral opening 21 (FIGS. 8D and 8E) opening into the bore of the housing 12 and intended to be viewed from the passage 15 of the plate and from the second opening 22 of the mounting element for the transmission passage.

When the mounting element 16 and the actuator 10 are fixed on either side of the plate 4, and the drive device 14 is mounted in the housing, it defines a housing which is substantially tight, in particular dust-tight and to the liquid.

In the example shown, the mounting element 16 has a flat outer face 16.1 intended to come into contact against the second face 4.2 of the plate and in which the second opening 22 is produced.

According to the invention, the mounting element 16 and / or the housing 12 of the actuator is or are secured to the plate 4 by one or more bayonet connections.

In FIGS. 5A to 8E, one can see detailed views of an exemplary embodiment of the mounting element of the drive device, of the actuator and of the plate at the level of the fixing on the plate in which the mounting element 16 is fixed to plate 4 by bayonet fixing means 38.

The bayonet fixing means 38 comprise a male part carried by the plate 4 or the mounting element 16 and a female part carried by the mounting element 16 or the plate 4 respectively. In the example shown, the male part is carried by the mounting element 16 (FIGS. 5A and 5B) and comprises at least two tabs 40 bordering the second opening 22 of the body of the mounting element 16 and extending radially towards the outside of the second opening 22. In FIG. 5A, one can see the first opening 20 and the housing 18. The female part is carried by the plate 4 at the level of the passage 15, it comprises at least two notches 42 made in the contour of passage 15 (Figure 7).

The notches 42 are for example diametrically opposite and the tabs 40 are also diametrically opposite. We could provide more than two ears and as many notches. In addition, another arrangement than the diametrically opposite arrangement of the tabs and the notches can be envisaged.

The bayonet fixing is obtained by aligning each lug 40 with a notch 42 and bringing the mounting element 16 axially closer to the plate 4 on the side of the second face 4.2 (FIG. 8A), so that the lugs 40 penetrate into the notches 42. Then, when the mounting element is sufficiently pushed into the passage 15, so that the tabs 40 project relative to the first face 4.1 of the plate 4 (FIG. 8B), the mounting element 16 is pivoted around the axis of the passage 15 so that the legs are in an angular position offset with respect to the notches 42, ensuring an axial retention of the mounting element 16 relative to the plate 4 (FIG. 8C).

Advantageously, locking means 44 for fixing by bayonet are provided in order to prevent the mounting element 16 from becoming detached from the plate 4, for example due to vibrations.

Advantageously, the locking means 44 are carried by the housing. In the example shown, they comprise at least one shape on the body of the mounting element 16 cooperating with at least one shape on the actuator 110, and more particularly on the housing 12, and at least one shape in the plate. 4 and ensuring a locking of the mounting element 16 on the plate 4.

In the example shown, the second opening 22 has an inner contour provided with two first diametrically opposite recesses 46.

In addition, the interior contour of the passage 15 also includes two second diametrically opposite recesses 48, such that the interior contour of the passage 15 corresponds to the interior contour of the second opening 22 and such that, when the mounting element 16 is mounted against the second face 4.1 of the plate 4, each first recess 46 is aligned with a second recess 48 in the direction of the axis of the passage 15, and the internal contour of the plate and that of the second opening forms a closed surface that is substantially continuous.

As can be seen in FIG. 8A, the transverse plane containing the free edge of the first recesses 46 is set back with respect to the transverse plane containing the legs 40 so that, during assembly, the legs 40 penetrate into the notches 42 of the passage axial 15 before the free edge of the first recesses 46 is in abutment against the second face 4.2 of the plate 4.

Furthermore, the housing 12 comprises a fixing plate 50 provided with a border 52 projecting from the face of the fixing plate 50 (FIGS. 6A and 6B). We can see the bore 13 in FIG. 6B and in FIGS. 8D and 8E, we can see the lateral opening 21 of the housing 12.

The outer cross section of the edge 52 corresponds to the interior contour of the passage 15 and the interior contour of the second opening 22, so that it fits in the passage 15 and in the second opening 22. It has two diametrically opposite ears 54 of which the external dimensions correspond to the internal dimensions of the first 46 and second 48 recesses. Furthermore, the dimension of the ears 54 along the axis of the passage 15 is sufficient for them to penetrate into the first recesses 46 of the second opening 22 of the mounting element. After fixing by the bayonet link of the mounting element 16 in the passage 15, the housing 12 is brought closer to the plate on the side of the first face 4.1 (FIG. 8D) and the border 52 is introduced in the passage 15. The ears 54 form angular stops preventing any rotation of the mounting element. The bayonet mount is locked (Figure 8E).

The locking means could comprise only a first recess 46, a second recess 48 and an ear 54 or more than two first and second recesses 46 and 48 and two ears.

Furthermore, the recesses could be replaced in whole or in part by protruding shapes in the contour of the second opening 22 and in the contour of the passage 15.

Alternatively, the locking could be provided by a different insert from the housing.

The housing 12 is for example fixed on the plate 4 for example by screwing, riveting and / or welding offering high reliability of the assembly. In the case of riveting or screwing, the fixing plate 50 has orifices 56 for the passage of the rivets or screws.

Alternatively, bayonet fastening means could be provided to secure the actuator on the plate and also ensure locking of the mounting element on the plate.

According to yet another variant, provision could be made to secure the housing 12 of the actuator on the plate by means of fixing by bayonet and to lock these means by fixing the mounting element 16 on the plate, for example by screwing , riveting and / or welding.

Advantageously, means for aligning the first recesses 46 with the second recesses 48 are provided and are particularly visible in FIGS. 8A to 8C. In the example shown, the alignment means 58 are formed by a first arcuate edge 60 extending on one side of a tab 40 and a second arcuate edge 62 extending from the other side of the tab 40. The two edges 60, 62 extend in the direction of the first recesses 46 along the contour of the second opening 22. The plane containing the free transverse faces of the edges 60, 62 is situated between that containing the legs 40 and that containing the free transverse faces of the first recesses 46.

In addition, the bases of the second recesses 48 of the passage 15 are such that they comprise two substantially radial projections 64, 66 in the contour of the passage 15. The radial projection 64 of a base of a second recess 48 delimits with a projection radial 66 from the base of the other second recess, two arc portions 68, 70 on either side of a second recess 48.

In the example shown, the two edges 60, 62 of the outline of the second opening 22 do not have the same arc length. In the example shown but not limited to, the arc length of the edge 60 is equal to the arc length of the arc portion 68 and the arc length of the edge 62 is less than the arc length of the arc portion 70.

During the axial approximation of the mounting element 16 and the plate 4, the tabs 40 penetrate into the notches 42 until the free transverse faces of the first recesses 46 are in abutment against the face 4.2 of the plate. The edge 60 is then in the arc portion 68 and the edge 62 is in the arc portion 70. The mounting element 16 is pivoted clockwise around the axis of the passage 15, and a angular end of the edge 62 of the contour of the second opening 22 abuts against the radial projection 64 of the interior contour of the passage

15. The length of the edge 62 is chosen so that, when the end of the edge 62 abuts against the radial projection 64, the first recesses 46 are axially aligned with the second recesses 48 and allow mounting of the ears 54 of the housing in the cavities 46, 48.

This bayonet mounting of the mounting element has the advantage of offering better stress distribution compared to mounting the mounting element and the actuator by riveting.

Provision could be made to mount the wheel cylinder 8 on the plate by bayonet means and also provide for rotation locking of these means.

Very advantageously, provision may be made to make the body of the mounting element and / or that of the actuator and / / of the wheel cylinder from an extruded bar, for example made of aluminum, such as the aluminum 6082 according to standard NF EN 573-3.

In FIGS. 3 and 4, one can see cross sections of extruded bars 24, 26, 28 which can be used to produce the mounting element.

The body is produced from an axial section of an extruded bar, this axial section is then machined for example to produce the first 20 and second 22 openings and the housing 18. The extruded bar is cut into axial sections of the same length and the axial sections are machined using one or more machine tools.

The extruded bar 24 of Figure 3 is the one used to make the mounting element of Figures 2A and 2B. For the sake of simplicity of representation, the bayonet fixing means are not shown in FIGS. 2A and 2B.

The external profile of the extruded bar 24 has a flat face 24.1, a portion of which will form the flat face 16.1 of the mounting element and in which the second opening 22 will be made. It also has a concave external surface 24.2 inside which will be made housing 18.

Thus, mass production of the mounting elements is very simplified since part of the elements of the structure of the mounting element are produced directly during the extrusion of the bar. The machining steps are reduced compared to a manufacture from bars of circular section and a saving of material is achieved.

Advantageously, the actuator housing also comes from an axial section of an extruded bar, which has then been machined.

In FIG. 3, the bar 26 is that from which the axial section used to manufacture the housing 12 of the actuator of FIGS. 2A and 2B originates. This axial section is different from that coming from the bar 24 for producing the body of the mounting element. It has a flat face 26.1, a portion of which will form the flat face

12.1 of the housing 12 and in which the lateral opening will be made. It also has a concave outer surface 24.2 inside which will be provided a housing for the drive assembly.

Even more advantageously, the same extruded bars are used for the production of the actuator housing and the production of the body of the mounting element. In Figure 4, we can see two identical extruded bars. Thus, the supply of extruded bars or the manufacture of extruded bars is simplified because only one reference is required. The machining steps will be at least partly different.

It can also be provided, advantageously, that the body of the wheel cylinder comes from an axial section of an extruded bar, which is then machined. Indeed, as can be seen in Figures IA and IB, the outer shape of the wheel cylinder and the outer shape of the mounting element are close, the wheel cylinder can therefore be made from an extruded bar .

We will describe an example of a method for producing at least one mounting element of a drive device.

During a first step, a bar is extruded. Its external profile is chosen so that, when the bar is cut into axial sections, the external surfaces comprise elements of the external surface of the mounting element requiring little or no recovery. Advantageously, it comprises at least one flat face.

In one example, it also has a longitudinal projection in extension of the flat face intended to form the fixing plates in which the tabs 40 will be machined.

During a following step, the bar is cut into axial sections of the same length, the length of the axial sections is substantially the length of the mounting element along the axis Y2.

During a following step, each axial section is machined so as to produce the mounting element described above, in particular the housing 18 is machined as well as the first opening 20 advantageously in a single pass, then the second opening 22 is machined by the flat face 16.1 so that it opens into the housing 18 and the elements of the bayonet connection, such as the lugs 140, are also machined.

Advantageously, the same steps can be carried out to produce the housing 12 of the actuator 10, either from an extruded bar having the same cross section as that used to produce the mounting element (FIG. 4), or a cross section different (Figure 3). In general, as for the production of the mounting elements, the external profile of the extruded bar is chosen so that, when the bar is cut into axial sections, the external surfaces include elements of the external surface of the actuator which do not require little or no recovery. Advantageously, it comprises at least one flat face.

Advantageously also, the same steps can be carried out to produce the wheel cylinder, either from an extruded bar having the same cross section as that used to produce the mounting element or that to produce the actuator housing, either having a different cross section.

During a following step, the mounting element is secured to the plate on the side of the second face 4.2, by a bayonet connection as described above, and the housing is secured to the plate on the side of the first face 4.1 either by bayonet connection or by riveting and / or screwing. Then the gearmotor is mounted in the mounting element and is connected to the actuator screw-nut system.

Then, the drum brake assembly, in particular the wheel cylinder, the segments and the return springs, are put in place: the wheel cylinder is fixed on the plate on the side of the first face 4.1, for example by screwing , riveting and / or welding or by a bayonet connection.

The production of the mounting element by machining a section of an extruded bar is particularly suitable for the production of the mounting element of FIGS. 5A and 5B likewise for the actuator housing of FIGS. 6A and 6B .

The production of a drum brake in which the mounting element of the drive device and / or the actuator housing is or are fixed to the housing by one or more bayonet connections is also particularly suitable for the production of '' a drum in hat type parking brake.

REFERENCES

X axis of the plate

Y1 actuator axis

Y2 axis of the plate brake drum mounting element

4.1 first side of the plate

4.2 second side of the stage

6.1, 6.2 ends of the brake shoe 6 6, 7 brake shoes

7.1, 7.2 ends of the brake shoe 7 8 actuator wheel cylinder actuator body support elements drive device passage in the plate mounting element mounting element housing screw first opening side opening second opening plate extruded bar attachment

24.1 flat face of the extruded bar 24

24.2 concave outer surface of the extruded bar 24

24.3 projection of the extruded bar 24 extruded bar

26.1 flat face of the extruded bar 26 28 extruded bar 38 bayonet fixing means 40 tabs

42 locking means notches 46 first cavities 48 second cavities 50 fixing plate

52 ear flange orifices in the mounting plate 50 58 alignment means 60 first border

62 second border

64, 66 radial projections 68, 70 portions of arcs.

Claims (13)

1. Drum brake comprising: - a plate (4) comprising a through passage (15), - at least one parking brake actuator (10) mounted on a first face of the plate (4), the actuator (10) comprising a housing (12) in which is mounted a drive assembly, said housing (12) comprising a lateral opening giving access to the drive assembly, the housing (12) being mounted on the plate (4) so that the lateral opening of the housing (12) is aligned with the passage (15) of the plate ( 4), - a drive device (14) for the parking brake actuator (10), - a mounting element (16) of the drive device (14) on a second face of the plate, the mounting element (16) comprising a housing (18) receiving at least partially the drive device (14) , a first opening (20) opening into said housing (18) for mounting said at least part of the drive device (14) in the housing (18), and a second opening (22), the mounting element ( 16) being mounted on the plate (4) so that the second opening (22) is aligned with the passage (15) of the plate (4), - at least one braking segment (6, 7), - a drum, - a transmission between the actuator and the drive device (14), characterized in that the mounting element (16) and / or the housing (12) of the actuator (10) is or are secured to the plate (4) by bayonet fastening means (38). 2. drum brake according to claim 1, in which the bayonet fastening means comprise a female part carried by the contour of the passage (15) of the plate and a male part carried by the contour of the second opening (22) of the mounting element and / or the lateral orifice of the housing (12) of the actuator. 3. Drum brake according to claim 1 or 2, comprising locking means (44) bayonet connection means. 4. Drum brake according to claim 2 and 3, wherein the mounting element (16) or the actuator housing is secured to the plate (4) by a bayonet connection, and wherein the locking means (44 ) comprise at least a first form (48) carried by the contour of the passage (15) of the plate, at least a second form (46) carried by the contour the second opening (22) of the mounting element (16) or the contour of the lateral opening (21) of the housing (12) of the actuator, said first (48) and second (46) forms being aligned in the direction of an axis of the passage (15) of the plate (4) , and at least a third form (54) carried by the contour of the lateral opening (21) of the housing (12) of the actuator or the second opening (22) of the mounting element (16), said third form (54) accommodating in the first (48) and second forms (48) aligned and locking the bayonet connection. 5. Drum brake according to claim 4, in which the contour of the passage (15) of the plate (4) comprises two first diametrically opposed shapes (48), the contour of the second opening (22) of the mounting element ( 16) or the lateral orifice (21) of the housing (12) of the actuator comprising two second diametrically opposite forms (46) and the outline of the lateral orifice of the housing (12) of the actuator or the second opening ( 22) of the mounting element comprising two third diametrically opposite forms (54). 6. Drum brake according to claim 4 or 5, wherein the first (48) and second (46) shapes are recesses and the third shape (s) (54) are ears. 7. Drum brake according to one of claims 4, 5 or 6, comprising alignment means (58) of the first (48) and second (46) forms. 8. Drum brake according to claim 7, in which the alignment means (58) comprise at least one radial face carried by the contour of the second orifice (22) of the mounting element or the contour of the lateral opening (21) of the housing (12) of the actuator and an angular stop (64) carried by the contour of the passage (15), said radial face coming into contact with the angular stop (60) by rotation of the mounting element (16) or the housing (14) of the actuator relative to the plate (4), the relative angular arrangement of the radial face and the angular stop (64) being such that when they come into contact, the first ( 48) and second (46) forms are substantially aligned along the axis of the passage (15). 9. Drum brake according to one of claims 4 to 8, in which the male part is carried by the contour of the second opening (22) of the mounting element (16), in which the third forms (52) are carried by the contour of the lateral opening (21) of the housing (12) of the actuator, and in which the housing (12) of the actuator is secured to the plate (4) by riveting and / or screwing. 10. Drum brake according to one of claims 1 to 9, wherein the drive device (14) comprises an electric motor. 11. Drum brake according to one of claims 1 to 10, comprising a hydraulic wheel cylinder (8) intended to apply said at least one braking segment (6, 7) to the drum under service braking. 12. Method for manufacturing a drum brake according to one of claims 1 to 11, comprising the steps: a) introduction of the contour of the second opening (22) of the mounting element or that of the lateral opening of the housing (12) of the actuator axially 5 in the passage (15) of the plate, b) rotation of the assembly element or of the actuator housing around the axis of the passage (15) of the plate, c) fixing of the actuator housing or of the assembly element, d) mounting of the braking segment on the plate, E) mounting the drive device in the mounting element. 13. The production method according to claim 12, wherein during step c), the actuator housing or the connecting element is fixed by riveting or screwing.