FR3060094B1 - RETAINING PIPE OF AN ACTUATOR IN RELATION TO A SUPPORT, COMPRISING AN INSERT - Google Patents

Abstract

The present invention relates to a holding lug (1) of an actuator (2) relative to a support (3), the holding lug (1) comprising: - A body (4) arranged to withstand the relative displacements of the actuator (2) relative to the support (3), - a first housing (5) arranged to receive a first fixing means (6) of the holding tab (1) to the support (3), - an insert (10) ) having a second housing (7) arranged to receive a second fastening means (8) rigidly connected to the actuator (2), the insert (10) being arranged to allow translation of the insert (10) relative to the second fixing means (8), characterized in that the insert (10) is fixed in translation relative to the body (4) and has a degree of freedom in rotation relative to the body (4).

Description

Supporting tab of an actuator relative to a support, comprising an insert

The present invention relates to a tab for holding an actuator relative to a support, in particular an engine control actuator for an automobile heat engine.

A thermal engine comprises a plurality of flow control actuators, such as an oxidizing air flow control actuator, or a recirculated exhaust gas flow control actuator. It is known, particularly from patent EP 2 562 450 B1, to combine these two actuators in the same actuator body. The part is mounted on the engine intake manifold, and can be cantilevered with respect to the engine. The vibrations of the heat engine are transmitted to the actuator and it may be necessary to maintain the room to prevent it undergoes excessive acceleration. This maintenance is provided for example by a holding tab connecting the actuator to a support, the support may be a fixed part of the engine. One end of the holding tab is thus fixed to the motor, and the other end is fixed to the actuator to maintain. The holding lug thus opposes the relative movements of the actuator relative to the engine, which makes it possible to reduce the level of acceleration experienced by the components of the actuator and thus to improve their reliability.

Due to the number of different elements involved in the relative positioning of the actuator relative to the support, there is considerable variability in the position of the fastening points of the holding tab. There is therefore a risk of stressing the holding tab during assembly, the compensation of the positioning dispersions of the fixing points being done by deformation of the holding tab. It is therefore necessary to use an easily deformable holding tab, which reduces the effectiveness of maintenance.

Another possibility is to provide a fixing system to compensate for dispersions, such as oblong holes receiving a fixing screw. Such systems are effective to allow compensation in one or two directions of translation, but do not allow rotational movement. In addition, the assembly is fixed after assembly, and does not compensate for changes in positioning over time, these changes may be due to wear of different parts or changes in dimensions due to differential thermal expansion of different elements. The object of the invention is to provide a holding lug allowing compensation of assembly tolerances by allowing a rotational movement and a translational movement of the part to be held relative to its support. It also makes it possible to compensate for changes over time in the relative position of the part to be fixed relative to its support. For this purpose, the invention proposes a tab for holding an actuator relative to a support, the holding tab comprising:

A body arranged to withstand the relative movements of the actuator relative to the support,

A first housing arranged to receive a first fixing means of the holding tab to the support,

An insert having a second housing arranged to receive a second fixing means rigidly connected to the actuator, the insert being arranged to allow translation of the insert relative to the second fixing means, characterized in that the insert is fixed in translation relative to the body and free in rotation relative to the body. The insert receives the second fastening means. The orientation of the insert relative to the body can be changed. Thus, the orientation of the holding tab relative to the actuator to maintain can be changed. In addition, a translation movement of the tab relative to the actuator is possible, since the second fixing means is capable of being translated relative to the insert. Thanks to these multiple possibilities of adjusting the relative position of the holding tab relative to the actuator to maintain it is possible to compensate for the dispersions of the positioning of the actuator to maintain relative to the support. The maintenance is improved and the mounting of the leg is facilitated.

Preferably, the insert has a shape of sphere portion.

The spherical portion shape allows the insert to have a degree of freedom in rotation relative to the body along three perpendicular axes.

More preferably, the sphere portion is symmetrical with respect to an equatorial plane.

The forces between the insert and the body are thus distributed symmetrically.

According to one embodiment, the housing of the insert extends along an axis.

Advantageously, the housing of the insert is of cylindrical shape.

The fastening means passing through the insert can thus easily slide inside the housing.

Preferably, the axis of the housing is perpendicular to the equatorial plane of the insert.

Preferably, the axis of the housing passes through the center of the sphere. The insert is thus symmetrical, which distributes the forces homogeneously.

According to a preferred embodiment, the body of the holding tab is of elongate shape. The size of the holding tab is thus minimized.

According to one embodiment, the retaining tab is metallic.

The holding lug thus has good mechanical strength.

Advantageously, the body is obtained by deformation of a metal strip.

The body of the holding lug can thus be manufactured with inexpensive tools.

Alternatively, the tab is obtained by molding.

Complex shapes can thus be easily obtained.

According to one embodiment, the thickness of the body of the holding tab is between 3 and 5 mm.

This thickness range makes it possible to obtain a resistance adapted to the targeted applications.

According to one embodiment, the retaining lug is made of plastic.

The holding lug is lighter than a leg made of metal.

Preferably, the body of the holding tab is ribbed.

The holding tab thus has a higher rigidity without increasing its weight.

According to one embodiment, the first housing is a through hole made in the body of the holding tab.

Preferably, the first housing is a cylindrical hole.

The first home is thus simply obtained. By making a hole of diameter greater than the diameter of the first fixing means, there is a clearance between the edge of the housing and the first fixing means. This game makes it possible to shift the bracket relative to the support. In other words, a degree of freedom in translation of the tab relative to the support is thus provided. The translation can be done in all directions according to which a game is present.

According to one embodiment, the first housing is an oblong hole extending along a minor axis and a major axis.

The oblong hole makes it possible to increase the possible offset of the holding tab relative to the support, in a preferred direction.

According to one embodiment, the holding lug comprises a third housing arranged to receive a fixing means to the support.

The additional fastening means thus prevents rotation of the holding tab relative to the support. The assembly of the holding tab is thus facilitated.

According to a first variant of the invention, the insert is received in a cage, the cage being received in a cylindrical portion of the body. The entire cage and insert form a ball joint.

According to a preferred embodiment, the cage comprises a receiving surface of the insert complementary to the shape of the insert.

In other words, the receiving surface comprises a hollow sphere portion. The insert can thus pivot with respect to the cage in three perpendicular directions.

Advantageously, the cage has a cylindrical outer periphery.

The ball joint can thus be inserted into a bore in the body of the holding tab.

According to one embodiment, the cage is fitted into a cylindrical portion of the body. The assembly of the cage in the body does not require additional fastening means.

According to one embodiment, the cylindrical portion of the body is formed by a ring integral with the body.

The housing receiving the cage is formed by a ring attached to the body. The manufacture of the body of the leg is thus simplified.

According to one embodiment, the ring is welded to the body.

Alternatively, the ring is crimped on the body.

In another variant, the ring is fitted on the body.

According to one embodiment, the cylindrical portion is formed by a bore formed in the body.

When the body of the leg has a sufficient thickness, the cylindrical portion can be obtained by a bore of the body. The dimensions of the cylindrical portion are then precisely controlled.

According to one embodiment, the second fastening means passing through the housing of the insert is a screw fixed to the actuator.

The screw comprises a non-threaded cylindrical portion which can slide in the housing of the insert.

According to one embodiment, the insert is received in a cavity of the body.

According to one embodiment, at least a portion of the cavity is an integral part of the body. The insert is thus received directly into the body, without an intermediate part. The cost of the holding tab is decreased.

According to another variant of the invention, at least a portion of the cavity receiving the insert is obtained by deformation of a portion of the body.

The body can thus be formed from a metal strip.

Advantageously, the cavity receiving the insert is delimited by a set of tongues cut into the body and shaped.

The tabs are deformed to create the shape of the cavity. The formation of the cavity receiving the spherical insert thus requires no additional parts.

Preferably, the set of tabs has an even number of tabs.

The maintenance of the insert is thus improved.

Advantageously, the body comprises at least four tabs.

According to one embodiment, the body has six tabs.

This number of tongues ensures a reliable maintenance while remaining simple to manufacture.

Preferably, each tongue has a contact zone with the insert.

The holding forces are thus distributed between each of the tongues, which balances the friction and facilitates the movement of the insert.

Advantageously, the cavity extends on either side of the equatorial plane of the insert.

Part of the tongues extends on one side of the equatorial plane of the insert, and the other part of the tongues extends on the other side of the equatorial plane of the insert. The free space created between the opposite tabs forms a receiving area for the insert.

According to one embodiment, the insert is held in the body between the tongues, two consecutive tongues being located on either side of the equatorial plane of the insert. The insert is thus held between two sets of tongues oriented in opposite directions. The insert is held in the cavity without using fastening means. The invention also relates to an assembly comprising: an actuator to be maintained, a holding lug as described above, arranged to hold the actuator, a first fastening means arranged to fix the holding lug on the support, a second fastening means arranged to fix the retaining tab on the actuator. The assembly of the holding lug and means for fixing the support makes it possible to maintain the actuator in order to reduce the accelerations. A rotational movement of the holding lug relative to the second fixing means is permitted by the geometry of the insert. A possibility of translation of the holding tab relative to the second fixing means is provided by the sliding of the insert relative to the second fixing means. A possibility of translation of the tab relative to the support is provided by the clearance between the housing of the first fixing means and the first fixing means. The proposed assembly thus makes it possible to compensate for the dimensional dispersions between the different elements, these dispersions possibly coming from manufacturing dispersions between the parts as well as changes in the dimensions of the parts as a function of time. The invention also relates to a method for holding an insert in a housing of a body, the insert having a shape of sphere portion, the method comprising the following successive steps:

Forming holding tongues by cutting a portion of the body, (step 50) forming a first portion of a cavity receiving the insert, by deforming a first portion of the tongues in a first direction, (step 51) deforming a second portion of the tabs in the opposite direction, (step 52)

Insert the insert into the first part of the cavity (step 53) Deform the second part of the tabs to hold the insert in the cavity (step 54)

The cavity receiving the insert is formed in successive steps. No additional parts are needed to hold the insert. The holding lug can be made simply and economically.

According to one embodiment, the method comprises the step of: deforming the second part of the tongues in order to press them against the surface of the insert.

Plating the tabs on the insert itself, the game is removed. The forces applied by the member to be held on the second fastening means are thus directly transmitted to the insert, and from there to the body of the holding tab. A hold is thus ensured even for low amplitude displacements.

According to an example of implementation of the method, each cut tab has two non-parallel sides.

According to an example of implementation of the method, each cut tab comprises a triangular portion.

Preferably, the cut tabs have a shape of disk angular sector.

Advantageously, two contiguous tabs have a common side.

The number of cuts required to obtain the tongues is thus minimized. Other characteristics and advantages of the invention will appear on reading the detailed description of the embodiments given by way of non-limiting examples, accompanied by the figures below:

FIGS. 1 and 2 schematically represent an engine control actuator maintained at a heat engine by an assembly comprising a holding lug according to the invention,

FIG. 3 is a view of an insert of a holding tab according to a first variant of the invention,

FIGS. 4 and 5 are perspective views, according to different angles of view, of a holding tab according to a second variant of the invention,

FIGS. 6a to 6f schematically describe the various operations of a holding method according to the invention,

FIG. 7 is a block diagram illustrating the various steps of the method according to the invention.

In order to facilitate the reading of the figures, the different elements are not necessarily represented on the scale.

FIG. 1 shows schematically a combustion engine, for example a motor providing propulsion for a motor vehicle. The engine comprises an intake distributor 22, a supercharging device 23, and a valve 2 for recirculating the exhaust gas. In this example, the valve is a double valve, that is to say that it mixes the combustion air and the recirculated exhaust gas, and allows to independently control the flow of each of these two flows gas. Valve 2 is cantilevered from the engine, i.e., the weight of the valve is remote from the engine and tends to bend the intake manifold 22. In the absence of valve retention , the engine vibrations can cause high accelerations at the valve 2, bending the inlet manifold 22 can amplify the engine vibration. These accelerations can degrade the components of the valve 2, or the supercharging device 23, and compromise their reliability.

A holding lug 1 is thus added, and here connects the valve 2 to the engine block. The holding lug 1 thus opposes the movements of the valve 2 relative to the engine and makes it possible to reduce the level of acceleration received by the components mounted on the intake distributor 22.

Thus, FIG. 2 shows an assembly 30 comprising: an actuator 2 to be maintained, a holding lug 1, arranged to hold the actuator 2, a first fixing means 6 arranged to fix the holding lug 1 on the support 3, a second fastening means 8 arranged to fix the holding lug 1 on the actuator 2. The actuator 2 is here the aforementioned valve, and the member providing the support of the actuator 2 is the motor.

As shown diagrammatically in FIG. 2, the holding lug 1 of the actuator 2 with respect to the support 3 comprises:

A body 4 arranged to withstand the relative displacements of the actuator 2 with respect to the support 3,

A first housing 5 arranged to receive a first fastening means 6 of the holding lug 1 to the support 3,

An insert 10 having a second housing 7 arranged to receive a second fastening means 8 rigidly connected to the actuator 2, the insert 10 being arranged to allow translation of the insert 10 relative to the second fastening means 8, characterized in that the insert 10 is fixed in translation relative to the body 4 and free in rotation with respect to the body 4. The insert 10 receives the second fastening means 8. The orientation of the insert 10 relative to the body 4 can be modified, since the insert 10 is free to rotate relative to the body 4. By free rotation, it is meant that the insert 10 can have a rotational movement relative to the body 4, the rotational movement being able to perform according to the three directions of space.

In other words, the insert 10 has three degrees of freedom in rotation relative to the body 4, each degree of freedom in rotation being with respect to an axis, and the three axes being perpendicular to each other. By fixed in translation, it is meant that the insert 10 is immobilized in translation relative to the body 4.

Thus, the orientation of the holding tab relative to the actuator to maintain can be changed. In addition, a translation movement of the tab relative to the actuator is possible, since the second fixing means is capable of being translated relative to the insert. This translational movement can be effected along the axis D of the housing of the insert, which is also the axis along which the second fixing means extends. Thanks to these multiple possibilities of adjusting the relative position of the holding tab relative to the actuator to maintain, it is possible to compensate for the dispersions of the positioning of the actuator to maintain relative to the support. The maintenance is improved and the mounting of the leg is facilitated. The insert 10 has a shape of sphere portion.

The sphere portion shape allows the insert 10 to have a degree of freedom in rotation relative to the body along three perpendicular axes.

The sphere portion is symmetrical with respect to an equatorial plane P.

The forces between the insert and the body are thus distributed symmetrically.

The housing 7 of the insert 10 extends along an axis D.

In the example of Figure 2, the housing 7 of the insert 10 is cylindrical.

The fastening means 8 passing through the insert 10 can thus slide inside the housing 7. The clearance between the fastening means 8 and the housing 7 is chosen so as to allow easy sliding. The axis D of the housing 7 is perpendicular to the equatorial plane P of the insert 10. The axis D of the housing 7 passes through the center of the sphere. The insert is thus symmetrical, which distributes the forces homogeneously.

The body 4 of the retaining lug 1 is elongated.

In the illustrated examples, the holding lug 1 is metallic.

More specifically, the body 4 is obtained by deformation of a metal strip.

In order to increase its rigidity, the body 4 of the holding lug 1 is ribbed.

The first housing 5 is a through hole made in the body 4 of the holding lug 1.

The first housing 5 is a cylindrical hole.

The first fixing means 6 is a screw passing through the housing 5 and pressing the holding tab 1 against the support 3.

The diameter of the screw 6 is less than the diameter of the housing 5, so as to leave a gap between the edge of the housing 5 and the screw 6. This game allows, during the mounting phase of the holding tab, to shift the leg holding relative to the support. In other words, the clearance between the first fixing means and the inner surface of the housing 5 provides a possibility of translation of the holding lug 1 relative to the support 3, as long as the holding lug is not fixed to the support. These degrees of freedom in translation, in two directions perpendicular to the axis of the first fixing means, complete the degree of freedom in translation provided by the sliding of the second fixing means in the housing 7 of the insert 10. The leg 4 can thus have a translational movement in three independent directions and a rotational movement along three independent axes.

These adjustment possibilities make it possible to compensate the dispersions of dimensions between the different series of pieces. They also make it possible to compensate for dimensional changes in parts over time. These evolutions can come from the variations of the dimensions of the parts with the temperature of use, or variations with the wear of the parts. Once the support tab assembled, the orientation of the insert and the position of the second fastening means in the insert can change under the effect of the forces applied by the evolution of the dimensions of the parts.

The holding lug 1 maintains the direction of the body, which is the direction in which the actuator 2 is to be supported.

As can be seen in FIG. 4, the holding lug 1 comprises a third housing 32 arranged to receive another means of fixing to the support 3.

This additional fastening means, passing through the holding lug 1, thus prevents rotation of the holding lug 1 relative to the support during the assembly phase of the holding lug 1 on the support 3.

Figures 2 and 3 show a first variant of the invention.

In this embodiment, the insert 10 is received in a cage 27, the cage 27 being received in a cylindrical portion 28 of the body.

As can be seen in FIG. 3, the cage 27 has a receiving surface 29 of the insert 10 complementary to the shape of the insert 10.

In other words, the receiving surface 29 comprises a hollow sphere portion. The insert 10 can thus pivot with respect to the cage 27 in three perpendicular directions. The assembly of the cage 27 and the insert 10 form a ball joint.

The cage 27 has a cylindrical outer periphery 33.

In the embodiment of FIG. 2, the cage 27 is fitted into a cylindrical portion 28 of the body 4.

The cylindrical portion 28 of the body 4 is formed by a ring 31 integral with the body 4.

More specifically, the ring 31 is welded to the body 4.

The second fastening means 8 passing through the housing 7 of the insert 10 is a screw fixed to the actuator. The screw comprises a threaded portion which is screwed into a tapping of the valve 2. The screw 8 also comprises a non-threaded cylindrical portion which can be inserted into the housing 7 of the insert 10. The head 15 of the screw 8 can be stop limiting the translation movement of the insert 10 relative to the screw 8.

Figures 4 and 5 show a second variant of the invention.

In this embodiment, the insert 10 is received in a cavity 11 of the body.

At least a portion of the cavity 11 is an integral part of the body 4. The insert 10 is thus received directly into the body without an intermediate piece. The cost of the holding tab is thus reduced.

More specifically, at least a portion of the cavity 11 receiving the insert 10 is obtained by deformation of a portion of the body 4.

This embodiment is particularly advantageous when the body is formed from a metal strip.

The cavity 11 receiving the insert 10 is delimited by a set of tongues 12 cut into the body 4 and shaped.

By shaping, it is meant that the tabs are deformed to give them a desired shape. The tabs 12 are deformed to create the shape of the cavity. The set of tabs 12 has an even number of tabs.

The body 4 has at least four tabs.

In the example of Figures 4 and 5, the body 4 has six tabs.

Each tongue 12 has a contact zone 14 with the insert 10.

The holding forces are thus distributed between each of the tongues, which balances the friction and facilitates the pivoting of the insert 10.

The cavity 11 extends on either side of the equatorial plane P of the insert 10.

More specifically, a portion of the tabs 12 extends on one side of the equatorial plane P of the insert 10, and the other part of the tongues 12 extends on the other side of the equatorial plane P of the insert 10 The free space formed between the opposite tabs forms a receiving zone for the insert 10.

As shown in FIGS. 4 and 5, the insert 10 is held in the body 4 between the tongues 12, two consecutive tongues 12 being located on either side of the equatorial plane P of the insert 10. The insert 10 is thus held between two sets of tongues oriented in opposite directions. The insert 10 is held in the cavity without fixing means.

The method for maintaining the insert 10 in the body 4 will now be described.

The method of holding an insert 10 in a housing of a body 4, the insert 10 having a shape of sphere portion, comprises the following successive steps:

Forming tongues 12 holding by cutting a portion of the body 4, (step 50) forming a first portion 25 of a cavity 11 receiving the insert 10, by deformation of a first portion of the tongues 12 in a first direction , (step 51) Deform a second portion of the tabs 12 in the opposite direction, (step 52)

Insert the insert 10 into the first portion 25 of the cavity 11, (step 53) Deform the second portion of the tongues 12 to maintain the insert 10 in the cavity 11 (step 54).

Figure 6a shows schematically the cutting operation of the tongues in the body 4. A cutting tool makes it possible to outline the shape of the tongues. The sign 13 schematizes the cuts made in the body 4.

Each tongue 12 cut out comprises a triangular portion 24.

Two adjacent tabs 12 have a common side. In the example shown, three linear cutouts make it possible to form six tabs 12.

The tip of the triangular portion 24 of the tongues may optionally be truncated. In this case, each tongue 12 cut has two non-parallel sides.

As shown schematically in Figure 6b, a shaping tool 26a pushes a first portion of the tongues in a first direction. The result of this operation is shown schematically in Figure 6c. The already folded tabs delimit a first portion 25 of the cavity 11 in which the insert 10 will be inserted.

Another shaping tool 26b deforms the second part of the tabs, that is to say the tabs not deformed in the previous step, in the opposite direction. The configuration obtained after this second shaping step is shown schematically in Figure 6d. The amplitude of deformation of the tongues 12 must be sufficient to allow the passage of the insert 10. The insert 10 is then disposed in the housing 11 thus formed, as shown schematically in Figure 6d.

As shown diagrammatically in FIG. 6e, the tabs already deformed during step 52 are then deformed in the opposite direction in order to maintain the insert 10. This step uses a deformation tool represented schematically by the sign 26c.

In the example shown in FIG. 3, the method comprises the step of: deforming the other part of the tongues 12 so as to press them against the surface of the insert 10.

By plating the tabs 12 on the insert 10 itself, the game is removed. As shown diagrammatically in FIG. 6f, there is contact between the tongues 12 and the insert 10 at the level of the contact zones 14. The force between the tongues and the insert is adjusted in order to limit the friction between the insert 10 and the tabs 12, and thus allow easy rotation of the insert in its housing. By minimizing the play between the insert and the body, the maintenance provided by the holding tab is improved.

In the example shown, one half of the tongues is deformed in one direction, the other half is deformed in the opposite direction, and two adjacent tabs, that is to say contiguous, are deformed in different directions. This configuration optimizes the distribution of the contact areas.

According to embodiments not shown, the holding tab may also comprise one or more of the following characteristics, considered individually or in combination with one another:

The lug 1 can be obtained by molding.

The holding lug 1 may be plastic.

The first housing 5 may be an oblong hole extending along a minor axis and a major axis.

The ring 31 can be crimped on the body 4.

The ring 31 can be fitted on the body 4.

The cylindrical portion 28 may be formed by a bore formed in the body 4.

The support can be the cylinder head of the engine. The support can also be the gearbox to which the engine is coupled.

Of course, the invention is not limited to the embodiments described and illustrated, which have been given only as examples.

Claims (11)

1. Support tab (1) of an actuator (2) relative to a support (3), the holding tab (1) comprising: A body (4) arranged to withstand the relative movements of the actuator (2) ) relative to the support (3), a first housing (5) arranged to receive a first fixing means (6) of the holding lug (1) to the support (3), an insert (10) comprising a second housing ( 7) arranged to receive a second fastening means (8) rigidly connected to the actuator (2), the insert (10) being arranged to allow translation of the insert (10) relative to the second fastening means ( 8), characterized in that the insert (10) is fixed in translation relative to the body (4) and free to rotate relative to the body (4), the body (4) being obtained by deformation of a metal strip . 2. Support tab (1) according to the preceding claim, wherein the insert (10) has a shape of sphere portion. 3. Support tab (1) according to one of the preceding claims, wherein the housing (7) of the insert (10) extends along an axis (D). 4. Support tab (1) according to one of the preceding claims, wherein the housing (7) of the insert (10) is cylindrical. 5. Support tab (1) according to one of the preceding claims, wherein the insert (10) is received in a cage (27), the cage (27) being received in a cylindrical portion (28) of the body ( 4). 6. Support tab (1) according to the preceding claim, wherein the cylindrical portion (28) of the body (4) is formed by a ring (31) integral with the body (4). 7. Support tab (1) according to one of claims 1 to 4, wherein the insert (10) is received in a cavity (11) of the body (4). 8. Support tab (1) according to the preceding claim, wherein at least a portion of the cavity (11) receiving the insert (10) is obtained by deformation of a portion of the body (4). 9. Support tab (1) according to the preceding claim, wherein the cavity (11) receiving the insert (10) is delimited by a set of tabs (12) cut into the body (4) and shaped. 10. Assembly (30) comprising: an actuator (2) to maintain, a retaining tab (1) according to one of the preceding claims, arranged to hold the actuator (2), a first fastening means (6) arranged for fixing the holding lug (1) on the support (3), a second fixing means (8) arranged for fixing the holding lug (1) on the actuator (2). 11. A method of holding an insert (10) in a housing of a body (4), the insert (10) having a shape of sphere portion, the method comprising the following successive steps: forming tongues (12) ) for holding a portion of the body (4), (step 50) forming a first portion (25) of a cavity (11) receiving the insert (10), by deformation of a first portion of the tongues (12) in a first direction, (step 51) Deforming a second portion of the tongues (12) in the opposite direction, (step 52) Inserting the insert (10) into the first portion (25) of the cavity (11) (Step 53) Deform the second portion of the tabs (12) to hold the insert (10) in the cavity (11). (step 54)