FR3067427A1 - MOUNTING ELEMENT ON A DRUM BRAKE PLATE OF A DRIVING DEVICE, PREFERABLY ELECTRICAL, AND A DRUM BRAKE COMPRISING AT LEAST ONE MOUNTING ELEMENT - Google Patents

Abstract

Mounting element (16), on a drum brake plate (4), of a parking brake actuator driving device, said mounting element (16) having a body formed by an axial section of an extruded bar , said body having at least one housing for receiving at least part of the driving device, a first opening opening in said housing (18) for mounting said at least a portion of the drive device in the housing (18), the housing (18) and said first opening (20) being made by machining and a second opening made by machining, said second opening being intended to be aligned with a passage (15) in the plate (4) for connecting the drive device to the parking brake actuator.

Description

MOUNTING ELEMENT ON A DRUM BRAKE PLATE OF A DRIVE DEVICE, PREFERABLY ELECTRICALLY AND A DRUM BRAKE HAVING AT LEAST ONE SUCH MOUNTING ELEMENT

DESCRIPTION

TECHNICAL AREA AND PRIOR ART

The present invention relates to a mounting element, on a drum brake plate, of a drive device, preferably electric, of an actuator for a parking brake, a drum brake comprising at least one such element assembly and manufacturing process.

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 wheel spindle,

- a drum, mounted for rotation relative to a 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 serves as a service brake, 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 W02012 / 101485 describes a drum brake comprising an actuator driven by a gear 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.

We generally seek to optimize the production of drum brakes whose parking brake function is activated electrically.

STATEMENT OF THE INVENTION

It is therefore an object of the present invention to provide a mounting element, on the plate of a drum brake, of a drive device for a parking brake actuator of simplified manufacture.

It is also an object of the present invention to provide a drum brake of simplified manufacture.

The object stated above is achieved by a mounting element of a drive device for a parking brake actuator on a drum brake plate at a first face, comprising a body from a portion of an extruded bar, said body comprising a housing for receiving at least part of the drive device, said housing being produced by machining, means for fixing to the plate produced by machining and access to the housing to allow mechanical connection between the drive device and the actuator, the access being produced by machining.

The mass production of mounting elements can then be simplified, since it uses identical portions from an extruded bar and the machining of the different body parts can be carried out by means of a digital control. In addition, the outer profile of the bar can directly form portions of the outer surface of the mounting member.

Very advantageously, the housing of the parking brake actuator can also include a body from an extruded bar, preferably of identical shape to that used to manufacture the body of the mounting element.

Even more advantageously, the same extruded bar or different extruded bars are used to produce both the mounting element of the drive device, the actuator housing and the wheel cylinder.

The use of an extruded bar also makes it very easy to modify the size of the mounting element, compared with an embodiment by molding, and thus to be able to modify the size of the drive device.

The present invention also relates to a mounting element, on a drum brake plate, of a drive device for a parking brake actuator, said mounting element comprising a body comprising an external surface, said body being formed by an axial section of a first extruded bar, said body comprising at least one housing intended to receive at least part of the drive device, a first opening opening into said housing for mounting said at least one part of the device drive in the housing, the housing and said first opening being produced by machining and a second opening produced by machining, said second opening being intended to be aligned with a passage in the plate for connecting the drive device to the actuator of parking brake, the external profile of the first extruded bar comprising areas directly forming parts s from the exterior surface of the mounting element.

The external surface of the body advantageously comprises at least one flat face intended to come to bear against a second face of the plate, said flat face being formed by a part of a flat face of the first extruded bar.

The mounting element may comprise at least one plate for fixing to the plate, said fixing plate being formed by part of a transverse extension of the first extruded bar.

The present invention also relates to a drum brake comprising a plate, at least one parking brake actuator mounted on a first face of the plate, said actuator comprising a housing in which is mounted a drive assembly, a device for parking brake actuator drive, a mounting element according to the invention, in which is housed at least partially the drive device, at least one braking segment and a drum, the mounting element being mounted on the second face of the tray, the tray having a passage, the mounting element being mounted on the tray so that the second opening is aligned with the passage of the tray, said housing having a lateral opening giving access to the assembly d drive, the housing being mounted on the plate so that the lateral opening of the housing is aligned with the passage of the plate, the drum brake also comprising a transmission between the drive device and the drive assembly and passing through the second opening, the passage of the plate and the lateral opening of the actuator housing.

For example, the actuator housing comprises a body comprising an outer surface, said body formed by an axial section of an extruded bar, said body comprising at least one housing intended to receive the drive assembly, the opening lateral the housing and the lateral opening being produced by machining, the external profile of the second extruded bar comprising zones directly forming parts of the external surface of the housing.

Preferably, the housing comprises at least one flat face intended to come into abutment against a first face of the plate, said flat face formed by a part of a flat face of the second extruded bar.

In an exemplary embodiment, the housing may comprise at least one plate for fixing to the plate, said fixing plate being formed by a part of a lateral extension of the second extruded bar.

According to an additional characteristic, the drum brake comprises a hydraulic wheel cylinder intended to apply said at least one braking segment in service braking.

The wheel cylinder may comprise a body formed by an axial section of a third extruded bar, said body comprising at least one housing intended to receive drive pistons and a lateral orifice for the supply of fluid under pressure, the housing and the lateral orifice being produced by machining.

For example, the mounting element and / or the actuator housing are fixed to the plate by screwing, riveting and / or welding.

Advantageously, the attachments of the mounting element and of the actuator housing are simultaneous.

The mounting element may comprise a fixing plate, screws passing through said fixing plate and the plate and entering the actuator housing.

The drive device advantageously comprises at least one electric motor.

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

cutting of a first extruded bar into axial sections whose length is substantially equal to the axial length of the mounting element to be manufactured, the first extruded bar having an external profile chosen so that the external surfaces of the first extruded bar comprise external surface elements of the mounting element to be manufactured,

- machining of the first opening, the housing and the second opening.

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

a) production of a first extruded bar, the external profile of which is chosen so that the external surfaces of the first extruded bar comprise external surface elements of the mounting element to be manufactured,

b) cutting the first extruded bar into axial sections whose length is substantially equal to the axial length of the mounting element to be manufactured,

c) machining of the first opening, of the housing and of the second opening.

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

- fixing of the mounting element on the plate,

- placing at least part of the drive device in the mounting element,

- fixing of the box on the plate,

- fixing of the wheel cylinder on the plate,

- fitting of at least one braking segment.

The process for manufacturing a drum brake can comprise, before fixing the actuator to the plate, the manufacture of the actuator housing according to the following steps:

production of a second extruded bar, the external profile of which is chosen so that the external surfaces of the second extruded bar comprise elements of the external surface of the housing to be manufactured,

- cutting of the second extruded bar into axial sections, the length of which is substantially equal to the axial length of the housing to be manufactured,

- machining the housing to receive the drive assembly and the lateral opening, or

- cutting a second extruded bar into axial sections, the length of which is substantially equal to the axial length of the housing to be manufactured, the second extruded bar having an external profile so that the external surfaces of the second extruded bar have external surface elements of the housing to be manufactured,

- machining of the housing to receive the drive assembly and the lateral opening

The first extruded bar and the second extruded bar preferably have the same exterior profile.

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 wheel spindle,

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

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,

- Figure 2B is a sectional view of the drum brake plate of Figure 2A according to another section plane.

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 the rocket, two braking segments 6 mounted on a first face 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 13 extending along the Y axis and opening at the two longitudinal ends of the housing

12. A drive assembly is housed in the bore 13. 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 to apply a force on the ends 6.2, 7.2 in parking braking while being moved out of the housing along the Yl axis.

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 is introduces at least part of the drive device 14, 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 the first opening 20 could be oriented perpendicular to the plate, the motor axis being perpendicular to the plate.

The drive device is fixed in the housing 18 for example by means of one or more screws and / or 1 or more rods.

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 (not visible) opening into the bore 13 and intended to be opposite the passage 15 of the plate and the second opening 22 of the mounting element for the passage of the transmission.

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 sealed, in particular against dust and 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 made. This flat outer face extends laterally with respect to to the axis Y1 so as to comprise a fixing plate 23 provided with bores for the passage of fixing screws 25 to the plate 4. In the example shown and very advantageously, the screws 25 are also used for fixing the housing 12 of the actuator 10, on the plate. The free ends of the screws 25 projecting from the first face 4.1 penetrate into bores (not visible) provided in the planar face 12.1 of the housing body. This simultaneous fixing of the mounting element and of the housing facilitates the alignment of the second opening 22, of the lateral opening of the housing 12 and of the passage 15. The assembly is also faster.

Conversely, provision could be made for the housing 12 to have a fixing plate and for the simultaneous fixing of the housing 12 and the mounting element to be made by screwing on the side of the first face 4.1.

Alternatively, the mounting element and / or the housing may each comprise a fixing plate and may be fixed to the plate by riveting and / or welding, by the same fixing means or separate means

The body of the mounting element comes from an extruded bar, for example made of steel or aluminum.

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. 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 the housing 18 will be made in. The concave outer surface 24.2 is connected to the flat face 24.1 by a projection having a substantially rectangular section, part of which will form the fixed plate 23.

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 advantageously provided 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 .

As with the actuator, the wheel cylinder is fixed to the plate, for example by screwing, riveting and / or welding.

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.

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.

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, for example by riveting and / or welding, and the housing is secured to the plate on the side of the first face 4.1.

The wheel cylinder is also fixed to the plate on the side of the first face 4.1, for example by screwing, riveting and / or welding.

The other components of the brake are also mounted on the plate, such as the braking segments.

First of all, the actuator is assembled by mounting in the body of the actuator, the transmission then the two pistons.

The actuator thus assembled is then fixed to the brake plate, for example by screws or by rivets.

The reduction motor is then fixed to the brake plate.

The brake system comprising the wheel cylinder, the trimmed segments, the automatic take-up system, the springs, etc. is then mounted on the brake plate.

In FIGS. 5A to 8E, one can see a particularly advantageous example of a mounting element 116 of the drive device and of an actuator 110.

In this example, the attachment of at least one mounting element 116 to the plate 104 is carried out by means of bayonet fixing means 138.

The bayonet fixing means 138 comprise a male part carried by the plate 104 or the mounting element 116 and a female part carried by the mounting element 116 or the plate 104 respectively. In the example shown, the male part is carried by the mounting element 116 (FIGS. 5A and 5B) and comprises at least two tabs 140 bordering the second opening 122 of the body of the mounting element 116 and extending radially towards the outside of the second opening 122. In FIG. 5A, one can see the first opening 120 and the housing 118. The female part is carried by the plate 104 at the level of the passage 115, it comprises at least two notches 142 made in the contour of passage 115 (figure 7).

The notches 142 are for example diametrically opposite and the tabs 140 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 140 with a notch 142 and by axially bringing the mounting element 116 closer to the plate 104 on the side of the second face 104.2 (FIG. 8A), so that the lugs 140 penetrate into the notches 142. Then, when the mounting element is sufficiently pushed into the passage 115 so that the lugs 140 protrude relative to the first face 104.1 of the plate 104 (FIG. 8B), the mounting element 116 is pivoted around the 'axis of the passage 115 so that the legs are in an angular position offset from the notches 142, ensuring an axial retention of the mounting member 116 relative to the plate 104 (Figure 8C).

Advantageously, locking means 144 for fixing by bayonet are provided in order to prevent the mounting element 116 from becoming detached from the plate 104, for example due to vibrations.

The locking means 144 comprise at least one shape on the body of the mounting element 116 cooperating with at least one shape on the actuator 110, and more particularly on the housing 112, and at least one shape in the plate 104 and ensuring a locking of the mounting element 116 on the plate 104.

In the example shown, the second opening 122 has an inner contour provided with two first diametrically opposite recesses 146.

In addition, the interior contour of the passage 115 also includes two second diametrically opposite recesses 148 such that the interior contour of the passage 115 corresponds to the interior contour of the second opening 122 and such that, when the mounting element 116 is mounted against the second face. 104.1 of the plate 104, each first recess 146 is aligned with a second recess 148 in the direction of the axis of the passage 115 and that the internal contour of the plate and that of the second opening forms a substantially continuous closed surface.

As can be seen in FIG. 8A, the transverse plane containing the free edge of the first recesses 146 is set back with respect to the transverse plane containing the legs 140 so that, during assembly, the legs 140 penetrate into the notches 142 of the passage axial 115 before the free edge of the first recesses 146 is in abutment against the second face 104.2 of the plate 104.

Furthermore, the housing 112 comprises a fixing plate 150 provided with a border 152 projecting from the face of the fixing plate 150 (FIGS. 6A and 6B). We can see the bore 113 in Figure 6B and in Figures 8D and 8E, we can see the side opening 121 of the housing 112

The outer cross section of the border 152 corresponds to the interior contour of the passage 115 and the interior contour of the second opening 122, so that it fits in the passage 115 and in the second opening 122. It has two diametrically opposite ears 154 of which the external dimensions correspond to the internal dimensions of the first 146 and second 148 recesses. Furthermore, the size of the ears 154 along the axis of the passage 115 is sufficient for them to penetrate into the first recesses 146 of the second opening 122 of the mounting element. After fixing by the bayonet link of the mounting element 116 in the passage 115, the housing 112 is brought closer to the plate on the side of the first face 104.1 (FIG. 8D) and the border 152 is introduced into the passage 115. The ears 154 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 146, a second recess 148 and an ear 154 or more than two first and second recesses 146 and 148 and two ears.

Furthermore, the recesses could be replaced in whole or in part by protruding shapes in the outline of the second opening 122 and in the outline of the passage 115.

The housing 112 is for example fixed on the plate 104 for example by screwing, riveting and / or welding, offering great reliability in mounting. In the case of riveting or screwing, the fixing plate 150 has holes 156 for the passage of the rivets or screws.

According to a variant, means for securing by bayonet could be provided for securing the actuator to the plate and also ensuring locking of the mounting element on the plate.

According to yet another variant, provision could be made to secure the housing 112 of the actuator on the plate by means of fixing by bayonet and to lock these means by fixing the mounting element 116 on the plate, for example by screwing, riveting and / or welding.

Advantageously, means for aligning the first recesses 146 with the second recesses 148 are provided and are particularly visible in FIGS. 8A to 8C. In the example shown, the alignment means 158 are formed by a first arcuate edge 160 extending on one side of a tab 140 and a second arcuate edge 162 extending from the other side of the tab 140. The two edges 160, 162 extend in the direction of the first recesses 146 along the outline of the second opening 122. The plane containing the free transverse faces of the edges 160, 162 is located between that containing the legs 140 and the one containing the free transverse faces of the first recesses 146.

In addition, the bases of the second recesses 148 of the passage 115 are such that they comprise two substantially radial projections 164, 166 in the contour of the passage 115. The radial projection 164 of a base of a second recess 148 delimits with a radial projection 166 from the base of the other second recess two arc portions 168, 170 on either side of a second recess 148.

The two edges 160, 162 of the contour of the second opening 122 do not have the same arc length. The arc length of the edge 160 is equal to the arc length of the arc portion 168 and the arc length of the edge 162 is less than the arc length of the arc portion 170 .

Preferably, the length of the edge 160 is equal to the length of the portion 168, which makes it easier to install the mounting element in the tray.

During the axial approximation of the mounting element 116 and the plate 104, the tabs 140 penetrate into the notches 142 until the free transverse faces of the first recesses 146 are in abutment against the face 104.2 of the plate. The edge 160 is then in the arc portion 168 and the edge 162 is in the arc portion 170. The mounting element 116 is pivoted clockwise around the axis of the passage 115, and a angular end of the edge 162 of the outline of the second opening 122 abuts against the radial projection 164 of the inside outline of the passage 115. The length of the edge 162 is chosen so that, when the end of the edge 162 comes abutted against the radial projection 164, the first recesses 146 are axially aligned with the second recesses 148 and allows mounting of the ears 154 of the housing in the cavities 146,148.

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 on the plate by bayonet means and also provide for rotation locking of these means.

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 the mounting element from an axial section of an extruded bar, advantageously also the production of an actuator housing from an axial section of an extruded bar and possibly the production of a wheel cylinder from an axial section of an extruded bar can be applied to the production of a parking brake of the drum in hat type.

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 braking segment 7 8 actuator wheel cylinder actuator body bore drive device passage in the plate mounting element mounting element housing first opening second opening fixing plate extruded bar

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 extruded bar

104 tray

104.1 first side of the tray 104

104.2 second face of the plate 104 110 actuator

112 housing

113 bore

115 passage in the plateau

116 mounting element

118 cavity

120 first opening

122 second opening

121 side opening

138 bayonet fixing means 140 tabs 142 notches

144 locking means

146 first cavities

148 second cavities

150 mounting plate

152 border

154 ears

156 holes in the mounting plate 150

158 alignment means

160 first border

162 second border

164,166 radial projections

168,170 bow portions

Claims (17)

1. mounting element (16), on a drum brake plate (4), of a drive device (14) of a parking brake actuator (10), said mounting element (16) comprising a body comprising an outer surface, said body being formed by an axial section of a first extruded bar (24, 28), said body comprising at least one housing (18) intended to receive 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), the housing (18) and said first opening (20) being produced by machining and a second opening (22) produced by machining, said second opening (22) being intended to be aligned with a passage (15) in the plate (4) for connecting the drive device (14) to the '' parking brake actuator (10), the outer profile of the first extrud bar e having areas directly forming parts of the outer surface of the mounting member. 2. A mounting element according to claim 1, in which the external surface of the body comprises at least one flat face (16.1) intended to come into abutment against a second face (4.2) of the plate (4), said flat face (16.1) being formed by a part of a flat face (24.1) of the first extruded bar (24). 3. mounting element according to claim 2, comprising at least one fixing plate (23) to the plate (4), said fixing plate (23) being formed by a part of a transverse extension (24.3) of the first bar extruded (24). 4. Drum brake comprising a plate, at least one parking brake actuator (10) mounted on a first face of the plate, said actuator (10) comprising a housing (12) in which is mounted a drive assembly, a driving device (14) for the parking brake actuator (10), a mounting element (16) according to one of claims 1 to 3 in which the driving device (14) is housed at least partially ), at least one braking segment (6, 7) and a drum, the mounting element (16) being mounted on the second face (4.2) of the plate (4), the plate (4) having a passage (15 ), 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), said housing (12) having 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 al igneous with the passage (15) of the plate (4), the drum brake also comprising a transmission between the drive device (14) and the drive assembly and passing through the second opening (22), the passage (15 ) of the plate (4) and the lateral opening of the housing (12) of the actuator (10). 5. Drum brake according to claim 4, in which the housing (12) of the actuator (10) comprises a body comprising an external surface, said body formed by an axial section of an extruded bar (26), 28) , said body comprising at least one housing (13) intended to receive the drive assembly, the lateral opening the housing (13) and the lateral opening being produced by machining, the external profile of the second extruded bar comprising areas directly forming parts of the outer surface of the housing. 6. Drum brake according to claim 5, wherein the housing has at least one flat face (12.1) intended to come into abutment against a first face of the plate, said flat face formed by part of a flat face of the second extruded bar. 7. Drum brake according to claim 4, 5 or 6, wherein the housing comprises at least one plate for fixing to the plate (4), said fixing plate being formed by part of a lateral extension of the second extruded bar . 8. Drum brake according to one of claims 4 to 7, comprising a hydraulic wheel cylinder (8) intended to apply said at least one braking segment (6, 7) in service braking. 9. Drum brake according to claim 8, in which the wheel cylinder (8) comprises a body formed by an axial section of a third extruded bar, said body comprising at least one housing intended to receive drive pistons and a lateral orifice for the supply of pressurized fluid, the housing and the lateral orifice being produced by machining. 10. Drum brake according to one of claims 4 to 9, in which the mounting element (16) and / or the housing (12) of the actuator (10) are fixed to the plate (4) by screwing , riveting and / or welding. 11. Drum brake according to claim 10, wherein the fasteners of the mounting element (16) and the housing (12) of the actuator (10) are simultaneous. 12. Drum brake according to claim 11, in which the mounting element (16) comprises a fixing plate (23), screws (25) passing through said fixing plate (23) and the plate (4) and penetrating in the housing (12) of the actuator (10). 13. Drum brake according to one of claims 4 to 12, wherein the drive device (14) comprises at least one electric motor. 14. Method for manufacturing a mounting element according to one of claims 1 to 3, comprising the steps: a) production of a first extruded bar, the external profile of which is chosen so that the external surfaces of the first extruded bar comprise external surface elements of the mounting element to be manufactured, b) cutting the first extruded bar into axial sections whose length is substantially equal to the axial length of the mounting element to be manufactured, c) machining of the first opening, of the housing and of the second opening. 15. Method for manufacturing a drum brake according to one of claims 4 to 13, comprising the production of the mounting element according to the method of claim 14, and the steps: - fixing of the mounting element on the plate, - placing at least part of the drive device in the mounting element, - fixing of the housing on the plate, - fixing of the wheel cylinder on the plate, - fitting of at least one braking segment. 16. A method of manufacturing a drum brake according to claim 15, comprising, prior to fixing the actuator to the plate, the manufacture of the actuator housing according to the following steps: production of a second extruded bar, the external profile of which is chosen so that the external surfaces of the second extruded bar comprise elements of the external surface of the housing to be manufactured, - cutting of the second extruded bar into axial sections, the length of which is substantially equal to the axial length of the housing to be manufactured, - machining of the housing to receive the drive assembly and the lateral opening. 17. The manufacturing method according to claim 16, wherein the first extruded bar and the second extruded bar have the same external profile.