Cellular multi-layer heel board

Abstract

The invention relates to a heel board (1) with reduced vertical compactness and comprising a first hollow body formed at a front face of the heel board (1), between a base (11) and an external reinforcement (12) of the heel board (1), and a second hollow body formed at a rear face of the heel board (1), between an internal reinforcement and a rear closure part (14) of the heel board (1). These hollow bodies extend longitudinally along the heel board (1) in a discontinuous manner and make it possible to reinforce the rigidity of said heel board (1).

Description

Description Title of the invention: Multilayer and honeycomb heel board [1] The present invention claims priority from French application 2211014 filed on October 24, 2022, the content of which (text, drawings, and claims) is incorporated herein by reference. The technical context of the present invention is that of body structures for motor vehicles. More particularly, the invention relates to a heel board for a motor vehicle. [2] In the prior art, vehicles are known that have a front floor and a floor under a rear seat cushion, the seat cushion being raised relative to a front floor located under a front seat cushion. The seat cushion is connected to the front floor by a substantially vertical heel board extending along a transverse axis of the motor vehicle, across its passenger compartment and between two side members forming the body of the motor vehicle. The heel board is fixed by its lateral edges to the side members of the motor vehicle, to the front floor, and to the seat cushion. [3] Additionally, in the case of an electrified motor vehicle, traction batteries are housed under the floor and the heel board. However, in the event of a side impact of the motor vehicle against a post, located at the level of a central pillar of the motor vehicle, the mechanical stresses imposed on the motor vehicle resulting from the impact lead to significant stress on the floor. [4] However, this stress can lead to insufficient rigidity of the heelboard and, consequently, damage to the traction batteries located beneath it, resulting in serious damage to the vehicle and its occupants. Indeed, due to the presence of the traction batteries, the available space under the floor is reduced, thus requiring a redesign of the heelboard's geometry. [5] The present invention aims to provide a new heel board in order to address at least largely the previous problems and to lead to further advantages. [6] Another aim of the invention is to provide a heeled board of lesser height. [7] Another aim of the invention is to provide a more rigid heel board. [8] Another object of the invention is to improve the safety of the occupants of the motor vehicle and the integrity of the electric traction battery in particular in the event of a side pole impact. [9] According to a first aspect of the invention, at least one of the aforementioned objectives is achieved with a heel board for a motor vehicle intended to be located between an electric traction battery and a passenger compartment floor, the heel board extending along its own extension axis and intended to be fixed to two lateral longitudinal members of the motor vehicle, the heel board comprising:

[0010] - a base extending along its own axis of extension;

[0011] - a rear closure piece fixed securely to the base;

[0012] - at least one reinforcement working with the base and the rear closing piece;

[0013] - at least one hollow body formed between the base and at least one reinforcement, the at least one hollow body being delimited by at least one first depression formed on the base and by at least one second depression formed on at least one reinforcement and located opposite at least one first depression.

[0014] In the context of the present invention, the longitudinal axis, the transverse axis, and the vertical axis are defined relative to the motor vehicle on which the heel board conforming to the first aspect of the invention is intended to be mounted. More specifically, the transverse axis is understood as a direction taken between one side of the motor vehicle and an opposite side of said motor vehicle. In other words, the transverse axis is understood as a direction extending from a passenger side of the motor vehicle to a driver's side of said motor vehicle, or vice versa. The adjectives lateral, inside, and outside refer to such a transverse axis. Furthermore, the longitudinal axis is understood as being taken along a direction extending from front to back or from back to front of the motor vehicle. The longitudinal axis is perpendicular to the transverse axis. The adjectives front, front, and rear refer to this longitudinal axis.Finally, the vertical axis is understood as being taken along an axis that extends from the wheels of the motor vehicle towards the roof. of the said motor vehicle, or conversely, the vertical axis being simultaneously perpendicular to the transverse axis and to the longitudinal axis. The adjectives above and below, or lower and upper, refer to this vertical axis.

[0015] Additionally, a proper extension axis is also defined in the reference frame of the heel board, this proper extension axis being defined by the principal direction of elongation of the heel board. In the context of integrating the heel board into the motor vehicle, the proper extension axis of the heel board coincides, or is nearly coincident, with the transverse axis.

[0016] In the context of the present invention, the heel board is a multi-part element resulting from the assembly of several parts: the base, the rear closure piece, and at least one reinforcement. These parts are assembled to form a multi-groove joint that reinforces the rigidity of the heel board. The base and / or the rear closure piece and / or each of the at least one reinforcements are securely fastened to one another by any means, and more particularly by welding.

[0017] In the context of the present invention, the base is the main component of the heel board, the one to which at least one reinforcement and the rear closure piece are rigidly fixed. The base has a general L-shape. The base has a footplate designed to extend in a horizontal plane when the heel board is installed under the floor of the motor vehicle it is intended to equip. The footplate has reinforcing ribs. At one lateral end, the base has a central bearing surface extended on either side by lateral bearing surfaces. The central bearing surface and the lateral bearing surfaces form a flap from the footplate. In other words, the central bearing surface and the lateral bearing surfaces extend perpendicularly from the footplate.

[0018] In the context of the present invention, the rear closure piece has a shape analogous to and complementary to the base. Thus, the rear closure piece has a general L-shape. The rear closure piece has a support segment configured to cooperate with the base of the plinth and intended to extend in a horizontal plane when the heel board is installed under the floor of the motor vehicle it is intended to equip. At the level of a At the lateral end, the rear closure piece has a central segment extended on either side by lateral segments. The central segment and the lateral segments form a flap extending from the support segment. In other words, the central segment and the lateral segments extend perpendicularly from the support segment.

[0019] In the context of the present invention, at least one reinforcement takes the form of a strip configured to interact with the central support of the base. In other words, each at least one reinforcement is configured to bear against a front or rear face of the base. Each at least one reinforcement extends along its own axis of extension, so as to bear against the central support and the lateral supports of the base.

[0020] In the context of the present invention, at least one hollow body is formed by, on the one hand, the base and, on the other hand, at least one reinforcement. The hollow body thus forms a cavity delimited by the front or rear face of the base on one side, and one of the at least one reinforcement on the other. This advantageous configuration makes it possible to increase the rigidity of the heel board according to the invention.

[0021] In the context of the present invention, the depression takes the form of a concavity formed on the wall on which it is created. The depression is formed by stamping in order to locally deform the wall of the base or at least one reinforcement in order to delimit the hollow body on one side.

[0022] Thus, the heel board now includes at least one hollow section between the base and at least one reinforcement, thereby increasing its rigidity, particularly with regard to bending stresses along the longitudinal axis or buckling stresses about the transverse axis. The heel board according to the invention thus forms a multi-layered structure—the different layers being formed by the base, the rear closure piece, and at least one reinforcement—and a honeycomb structure due to the presence of at least one hollow section between two adjacent layers of the heel board. Consequently, it is possible to enhance the safety of the electric traction battery housed beneath it and of the passenger compartment located above the floor. Finally, this advantageous configuration allows for a compact geometry of the heel board, with a dimension that... along the vertical axis shorter than those usually observed on known heel boards.

[0023] The heel board conforming to the first aspect of the invention advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements being able to be taken alone or in combination:

[0024] - the base extends along its own axis of extension. The base thus presents an elongated profile along its own axis of extension, so as to extend between two lateral longitudinal members of the motor vehicle;

[0025] - at least one first depression and at least one second depression extend along the proper axis of extension. In other words, the first depression and the second depression have an elongated shape, for example in the shape of a groove, which extends along the largest dimension of the heel board conforming to the first aspect of the invention;

[0026] - at least one first depression comprises (i) a first central section extending along a central span of the base, (ii) two first lateral sections extending along first lateral spans of the base and extending on either side of the first central section. This advantageous configuration thus makes it possible to create several parts in the heel board, in order to offer several hollow bodies and a discontinuous profile of said hollow body relative to the axis of natural elongation of the heel board conforming to the first aspect of the invention;

[0027] - at least one reinforcement includes an external reinforcement fixed securely to a front face of the base, at least a second depression being formed on a front face of the external reinforcement located opposite the front face of the base;

[0028] - at least one second depression includes a second central section extending along a central part of the external reinforcement and configured to extend opposite the first central section of the base;

[0029] - the second central section of the external reinforcement has a length, measured along the natural extension axis of the heel board conforming to the first aspect of the invention, of between 700 and 800 mm. Preferably, the length the second section of the external reinforcement is between 750 mm and 800, preferably equal to 780 mm;

[0030] - the second central section of the external reinforcement has a plurality of feet that extend towards the base of the plinth with which it collaborates. In particular, the second section has 4 feet, the external reinforcement being welded to the base of the plinth near each foot;

[0031] - the thickness of the external reinforcement, taken relative to the longitudinal axis of the motor vehicle on which the heel board is intended to be mounted, is less than 10 mm, preferably between 5 mm and 9 mm, preferably also equal to 7 mm. In particular, the depth of the second central section of the external reinforcement, measured along the longitudinal axis of the motor vehicle on which the heel board is intended to be mounted, is between 1 mm and 3 mm;

[0032] - the first central section and the first two lateral sections of the base extend in projection from the central span of said base in a direction perpendicular to its own axis of extension, and the second central section of the external reinforcement extends in projection from the central part of said external reinforcement in a direction perpendicular to its own axis of extension and in a direction opposite to that of the first central section and the first two lateral sections of the base, so as to form at least one hollow body.More specifically, the second central section of the external reinforcement forms a groove oriented towards the front, relative to the longitudinal axis of the motor vehicle on which the heel board is intended to be mounted, and the first central section and the first two lateral sections of the base form grooves oriented towards the rear, relative to the longitudinal axis of the motor vehicle on which the heel board is intended to be mounted;

[0033] - at least one reinforcement includes an internal reinforcement fixed securely to a rear face of the base, at least a second depression being formed on a front face of the internal reinforcement located opposite the rear face of the base;

[0034] - The internal reinforcement is mounted in an intermediate position, relative to the longitudinal axis, between the base and the rear closing piece. More in particular, the internal reinforcement sandwiched between the base and the rear closing piece of the heel board;

[0035] - at least one second depression comprises two second lateral sections extending along the proper extension axis and from two lateral edges of the internal reinforcement, the two second sections being configured to extend partly opposite the first central section of the base;

[0036] - the first central section and the first two lateral sections of the base extend in projection from the central span of said base in a direction perpendicular to its own axis of extension, and the second lateral sections of the internal reinforcement extend in projection from a central portion of said internal reinforcement in a direction perpendicular to its own axis of extension and in a direction opposite to that of the first central section and the first two lateral sections of the base, so as to form at least one hollow body. More specifically, the second lateral sections of the internal reinforcement form a groove oriented towards the rear, relative to the longitudinal axis of the motor vehicle on which the heel board is intended to be mounted;

[0037] - the rear closure piece comprises two lateral segments located at lateral ends of the rear closure piece, the lateral segments each comprising a groove which extends along its own extension axis, each groove being located opposite one of the second lateral sections of the internal reinforcement, so as to form at least one hollow body;

[0038] - the groove of each lateral segment of the rear closing piece is oriented towards the rear, relative to the longitudinal axis;

[0039] - the heel board has a height, measured according to its largest dimension taken relative to a vertical axis, less than or equal to 12 cm, preferably less than 10 cm, and preferably still between 8 cm and 10 cm.

[0040] According to a second aspect of the invention, a motor vehicle is proposed comprising a heel board conforming to the first aspect of the invention or to any one of its improvements.

[0041] Advantageously, the motor vehicle is of the electrified type. In the context of the present invention, a vehicle An electrified automobile is a type of electric or hybrid vehicle. Generally, the drivetrain of such an electrified vehicle is rotated by an electric motor, powered by a traction battery, to generate torque that propels the vehicle. Additionally, or alternatively, the electric motor is configured to recover mechanical energy from the drivetrain and convert it into electrical energy, thereby producing braking torque on the drivetrain and recharging the traction battery.

[0042] The traction battery is a high-voltage electric battery capable of generating a direct current voltage of at least 300V, for example, 400V or 800V. Generally, the traction battery is configured to supply electrical power to the electric motor that generates torque on the vehicle's drivetrain.

[0043] In the context of the invention, the electric battery is located under the floor of the vehicle's passenger compartment, such that the heel plate is situated in an intermediate position, relative to the vertical axis, between said traction battery and said floor. Thus, due to the reduced height of the heel plate conforming to the first aspect of the invention, it is possible to increase the longitudinal and transverse rigidity of the floor, thereby better protecting the traction battery in the event of a side impact.

[0044] Various embodiments of the invention are envisaged, incorporating, according to all their possible combinations, the different optional features described herein.

[0045] Other features and advantages of the invention will become apparent from the following description on the one hand, and from several illustrative and non-limiting examples of embodiments given with reference to the attached schematic drawings on the other hand, in which:

[0046] [Fig.1] illustrates a three-dimensional view of an example of an embodiment of a heeled board conforming to the first aspect of the invention;

[0047] [Fig.2] illustrates a perspective view of an example of the realization of a base for the heeled board illustrated in FIGURE 1;

[0048] [Fig.3] illustrates a perspective view of an example of the realization of an external reinforcement of the heel board illustrated in FIGURE 1;

[0049] [Fig. 4] illustrates a perspective view of an example of the realization of an internal reinforcement of the heel board illustrated in FIGURE 1;

[0050] [Fig.5] illustrates a perspective view of an example of the realization of a rear closure piece of the heel board illustrated in FIGURE 1;

[0051] [Fig.6] illustrates a first cross-sectional view of the heel board shown in FIGURE 1, along axis AA;

[0052] [Fig.7] illustrates a second cross-sectional view of the heel board shown in FIGURE 1, along axis BB.

[0053] Of course, the features, variants, and different embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variants of the invention may include only a selection of features, described hereafter in isolation from the other described features, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from prior art.

[0054] In particular, all the variants and embodiments described can be combined with each other if there are no technical obstacles to this combination.

[0055] In the figures, elements common to several figures retain the same reference.

[0056] In the context of the present invention, the longitudinal axis X, the transverse axis Y and the vertical axis Z are defined relative to the motor vehicle on which the heel board 1 conforming to the first aspect of the invention is intended to be mounted.

[0057] More specifically, the Y-axis is defined as a direction between one side of the motor vehicle and the opposite side of the same motor vehicle. In other words, the Y-axis is defined as a direction extending from a passenger side of the motor vehicle to an opposite side driver of said motor vehicle, or vice versa. The adjectives lateral, interior and exterior refer to such a transverse axis Y.

[0058] Furthermore, the longitudinal axis X extends along a direction that runs from the front to the rear or from the rear to the front of the motor vehicle. The longitudinal axis X is perpendicular to the transverse axis Y. The adjectives front, front, and rear refer to this longitudinal axis X.

[0059] Finally, the vertical axis Z is understood as being taken along an axis that extends from the wheels of the motor vehicle towards the roof of said motor vehicle, or vice versa, the vertical axis Z being simultaneously perpendicular to the transverse axis Y and to the longitudinal axis X. The adjectives above and below, or lower and upper, refer to this vertical axis Z.

[0060] In addition, we also define a proper extension axis 01 in the reference frame of the heel board 1, the proper extension axis 01 being defined by the principal direction of elongation of the heel board 1. In the context of the integration of the heel board 1 into the motor vehicle, the proper extension axis of the heel board 1 is coincident or substantially coincident with the transverse axis Y.

[0061] With reference to the FIGURES, the invention relates to a heel plate 1 for a motor vehicle intended to be located between an electric traction battery and a passenger compartment floor, the heel plate 1 extending along its own extension axis 01 and intended to be fixed to two lateral side members of the motor vehicle. The heel plate 1 comprises:

[0062] - a base 11 extending along the proper extension axis 01;

[0063] - a rear closure piece 14 fixed securely to the base 11;

[0064] - at least one reinforcement collaborating with the base 11 and the rear closing piece 14. In particular, in the embodiment illustrated in FIGURE 1, the at least one reinforcement comprises an external reinforcement 12 and an internal reinforcement 13. The external reinforcement 12 is fixed to the side of a front face of the base 11, and the internal reinforcement 13 is fixed to the side of a rear face of the base 11, so that the internal reinforcement 13 is sandwiched between the base 11 and the rear closing piece 14;

[0065] - at least one hollow body 21, 22 formed between the base 11 and at least one reinforcement, the at least one hollow body 21, 22 being delimited by at least one first depression D1 formed on the base 11 and by at least one second depression D2 formed on the at least one reinforcement and located opposite the at least one first depression D1.

[0066] Such a heel board 1 thus has a lower vertical compactness than known heel boards 1: a height of the heel board 1 according to the invention, taken relative to the vertical axis Z, is thus less than 10 cm, and preferably between 8 cm and 10 cm, whereas known heel boards generally have a height greater than 15 cm.

[0067] As can be seen in FIGURE 2, the base 11 has a general "L"-shaped conformation, the base 11 comprising:

[0068] - a base 111 intended to extend in a plane formed by the transverse axis Y and the longitudinal axis X when the heel board 1 is installed under the floor of the motor vehicle it is intended to equip. The base 111 comprises a first part located on one side of a median longitudinal axis X of the base 11, and a second part located on a second side of the median longitudinal axis X. The first and second parts of the base 111 are symmetrical to each other, with respect to the median longitudinal axis X. The first and second parts of the base 111 are separated from each other by a central opening 115;

[0069] - a central span 112 extended on either side by lateral spans 116. The central span 112 and the lateral spans 116 form a flap from the base 111. The central span 112 and the lateral spans 116 extend along the proper extension axis 01, perpendicular to the base 111. The central span 112 and the lateral spans 116 extend in a plane formed by the transverse axis Y and the vertical axis Z.

[0070] In a clever way, base 11 shapes:

[0071] - a first central section 113 extending along the central span 112;

[0072] - two initial lateral sections extending along the first lateral spans 116 of the base 11 and extending on either side of the first central section

[0073] The first central section 113 and the first two lateral sections are formed on the base 11 by stamping. The first central section 113 and the first two lateral sections thus form grooves that extend along the axis of natural extension 01 of the heel board 1 according to the invention. The first central section 113 and the first two lateral sections extend in a straight line and parallel to each other, preferably collinearly. The first two lateral sections extend from a lateral edge of the base 11 towards the first central section 113.

[0074] The first central section 113 and the first two lateral sections form at least one first depression D1 of the heel board 1, so as to form the hollow body 21, 22 in collaboration with the external reinforcement 12 and as seen in FIGURE 6.

[0075] As can be seen in FIGURE 3, the external reinforcement 12 has a general shape similar to that of the base 11, the external reinforcement 12 being configured to be fixed rigidly to the base 11 in order to reinforce the central span 112 and the two lateral spans 116 of said base 11. The external reinforcement 12 comprises:

[0076] - a heel 121 intended to extend in a plane formed by the transverse axis Y and by the longitudinal axis X when the heel board 1 is implemented under the floor of the motor vehicle it is intended to equip. The heel 121 is configured to bear against the base 111 of the plinth 11. The heel 121 is formed of a plurality of parts spaced apart from each other, forming a discontinuous support against the base 111 of the plinth 11;

[0077] - a central part 122 extended on either side by lateral parts 127. The central part 122 and the lateral parts 127 form a flap from the heel 121. The central part 122 and the lateral parts 127 extend along the proper extension axis 01, perpendicular to the heel. The central part 122 and the lateral parts 127 extend in a plane formed by the transverse axis Y and the vertical axis Z.

[0078] The external reinforcement 12 is fixed securely against a front face of the base 11,

[0079] Ingeniously, the external reinforcement 12 shapes a second central section 124 extending along the central part 122. The second central section 124 is formed on the external reinforcement 12 by stamping. The second central section 124 thus forms a groove which extends along the proper extension axis 01 of the heel board 1 according to the invention. The second central section 124 extends in a straight line and parallel to the first central section 113 formed on the base 11.

[0080] The second central section 124 of the external reinforcement 12 also includes several feet 123 which extend towards the base 111 of the heel 121. In the embodiment illustrated in FIGURE 3, the second section includes 4 feet 123, the external reinforcement 12 being welded to the base 111 of the plinth 11 near each foot 123.

[0081] The second central section 124 is formed on a front face of the external reinforcement 12 located opposite the front face of the base 11, such that the groove formed by the second central section 124 extends, relative to the longitudinal axis X, in a direction opposite to that of the first central section 113 formed on the base 11, in order to form a second depression D2 as seen in FIGURE 3. The second depression D2 formed on the external reinforcement 12 and the first depression D1 formed on the base 11 together form the hollow body 21, 22, as seen in FIGURE 6.

[0082] As can be seen in FIGURE 4, the internal reinforcement 13 has a general conformation similar to that of the external reinforcement 12, the internal reinforcement 13 being configured to be fixed rigidly to the base 11 in order to reinforce the central span 112 and the two lateral spans 116 of said base 11. The internal reinforcement 13 is fixed rigidly to a rear face of the base 11, so that the internal reinforcement 13 is sandwiched between the base 11 and the rear closing piece 14 of the heel board 1.

[0083] Internal reinforcement 13 includes:

[0084] - a central portion 132 extended on either side by lateral portions 137. The central portion 132 and the lateral portions 137 extend along the proper extension axis 01 and in a plane formed by the transverse axis Y and by the vertical axis Z.

[0085] The internal reinforcement 13 is fixed securely against a rear face of the base 11,

[0086] Ingeniously, the internal reinforcement 13 shapes two second lateral sections 125 extending along the central portion 132. The second Lateral sections 125 are formed on the internal reinforcement 13 by stamping. The second lateral sections 125 thus each form a groove that extends along the inherent extension axis 01 of the heel board 1 according to the invention. The second lateral sections 125 extend in a straight line and parallel to each other, preferably collinearly.

[0087] The second lateral sections 125 are formed on a front face of the internal reinforcement 13 located opposite a rear face of the base 11, so that the groove formed by each second lateral section 134 extends, relative to the longitudinal axis X, in a direction opposite to the rear closing piece 14 which collaborates with the internal reinforcement 13. The groove formed on the internal reinforcement 13 and the rear closing piece 14 together delimit the hollow body 21, 22, as seen in FIGURE 7.

[0088] As shown in FIGURE 5, the rear closure piece 14 has a general conformation similar to that of the base 11, the rear closure piece 14 being configured to be fixed rigidly to the base 11 in order to sandwich the internal reinforcement 13 to reinforce the rigidity of the central bearing surface 112 and the two lateral bearing surfaces 116 of said base 11. The rear closure piece 14 is fixed rigidly to a rear face of the base 11 and / or the internal reinforcement 13.

[0089] The rear closure piece 14 has a general "L"-shaped conformation, the rear closure piece 14 comprising:

[0090] - a seat segment 141 intended to extend in a plane formed by the transverse axis Y and the longitudinal axis X when the heel board 1 is implemented under the floor of the motor vehicle it is intended to equip. The seat segment 141 comprises a first part located on one side of the median longitudinal axis X of the rear closure piece 14, and a second part located on a second side of the median longitudinal axis X. The first and second parts of the seat segment 141 are symmetrical to each other, with respect to the median longitudinal axis X. The first and second parts of the seat segment 141 are separated from each other by the central opening 115;

[0091] - a central segment 142 extended on either side by lateral segments 147. The central segment 142 and the lateral segments 147 form a flap extending from the seat segment 141. The central segment 142 and the segments The lateral segments 147 extend along the proper extension axis 01, perpendicular to the base segment 141. The central segment 142 and the lateral segments 147 extend in a plane formed by the transverse axis Y and the vertical axis Z.

[0092] The rear closure piece 14 is fixed securely against a rear face of the base 11 and / or the internal reinforcement 13.

[0093] Ingeniously, the rear closure piece 14 forms two grooves, each extending along one of the lateral segments 147. The grooves are formed on the rear closure piece 14 by stamping. The grooves extend along the inherent extension axis 01 of the heel board 1 according to the invention and towards the central segment 142 of the rear closure piece 14. The grooves extend in a straight line and parallel to each other, preferably collinearly.

[0094] The grooves are formed on a front face of the rear closure piece 14 located opposite a rear face of the internal reinforcement 13, such that the grooves formed extend, relative to the longitudinal axis X, in a direction opposite to the internal reinforcement 13. The grooves formed on the internal reinforcement 13 and the rear closure piece 14 together delimit the hollow body 21, 22, as seen in FIGURE 7.

[0095] With reference to FIGURES 6 and 7, a cross-section of the heel board 1 is shown along axes AA and BB respectively, visible in FIGURE 1. It can thus be observed that the heel board 1 comprises:

[0096] - a hollow body 21, 22 located at the level of a front face of said heel board 1, formed by the external reinforcement 12 and the base 11, and

[0097] - a hollow body 21, 22 located at the level of a rear face of the said heel board 1, formed by the internal reinforcement 13 and the rear closing piece 14.

[0098] This advantageous configuration thus makes it possible to reinforce the rigidity of the heel board 1 while reducing its compactness along the vertical axis Z.

[0099] In summary, the invention relates to a heel board 1 with reduced vertical compactness and comprising a first hollow body 21 formed on a front face of the heel board 1, between a base 11 and an external reinforcement 12 of the heel board 1, and a second hollow body 22 provided at the level of a rear face of the heel board 1, between an internal reinforcement 13 and a rear closing piece 14 of the heel board 1. These hollow bodies 21, 22 extend longitudinally along the heel board 1, in a discontinuous manner and allow to reinforce the rigidity of said heel board 1.

[0100] Of course, the invention is not limited to the examples just described, and many modifications can be made to these examples without departing from the scope of the invention. In particular, the various features, forms, variants, and embodiments of the invention can be combined with one another in various ways, provided they are not incompatible or mutually exclusive. Specifically, all the variants and embodiments described above are combinable.

Claims

Claims

1. Heel board (1) for a motor vehicle intended to be located between an electric traction battery and a passenger compartment floor, the heel board (1) extending along a specific extension axis (01) and intended to be fixed to two lateral side members of the motor vehicle, the heel board (1) comprising: - a base (11) extending along the proper extension axis (01); - a rear closing piece (14) fixed securely to the base (11); - at least one reinforcement collaborating with the base (11) and the rear closing part (14); characterized in that the heel board (1) comprises at least one hollow body (21, 22) formed between the base (11) and the at least one reinforcement, the at least one hollow body (21, 22) being delimited by at least one first depression (D1) formed on the base (11) and by at least one second depression (D2) formed on the at least one reinforcement and located opposite the at least one first depression (D1).

2. Heel board (1) according to the preceding claim, in which the at least one first depression (D1) comprises: - a first central section (113) extending along a central span (112) of the base (11); - two first lateral sections extending along first lateral spans (116) of the base (11) and extending on either side of the first central section (113).

3. Heel board (1) according to any one of the preceding claims, in which the at least one reinforcement comprises an external reinforcement (12) fixed integrally to a front face of the base (11), the at least one second depression (D2) being formed on a front face of the external reinforcement (12) located opposite the front face of the base (11).

4. Heel board (1) according to the preceding claim, in which the at least one second depression (D2) comprises a second central section (124) extending along a central part (122) of the external reinforcement (12) and configured to extend opposite the first central section (113) of the base (11).

5. Heel board (1) according to the preceding claim, in which the first central section (113) and the first two lateral sections of the base (11) project relative to the central bearing surface (112) of said base (11) in a direction perpendicular to the proper extension axis (01), and the second central section (124) of the external reinforcement (12) projects relative to the central portion (122) of said external reinforcement (12) in the direction perpendicular to the proper extension axis (01) and in a direction opposite to that of the first central section (113) and the first two lateral sections of the base (11), so as to form the at least one hollow body (21, 22).

6. Heel board (1) according to any one of the preceding claims, in which the at least one reinforcement comprises an internal reinforcement (13) fixed integrally to a rear face of the base (11), the at least one second depression (D2) being formed on a front face of the internal reinforcement (13) located opposite the rear face of the base (11).

7. Heel board (1) according to the preceding claim taken in combination with claim 2, in which the at least one second depression (D2) comprises two second lateral sections (125) extending along the proper extension axis (01) and from two lateral edges of the internal reinforcement (13), the two second sections being configured to extend partly opposite the first central section (113) of the base (11).

8. Heel board (1) according to the preceding claim, in which the first central section (113) and the first two lateral sections of the base (11) project relative to the central bearing surface (112) of said base (11) in a direction perpendicular to the proper extension axis (01), and the second lateral sections (125) of the internal reinforcement (13) project relative to a central portion (132) of said internal reinforcement (13) in the direction perpendicular to the proper extension axis (01) and in a direction opposite to that of the first central section (113) and the first two lateral sections of the base (11), so as to form the at least one hollow body (21, 22).

9. Heel board (1) according to any one of the preceding claims, in which the heel board (1) has a height, measured along its largest dimension taken relative to a vertical axis (Z), less than or equal to 12 cm, preferably less than 10 cm.

10. Motor vehicle comprising a heel board (1) according to any one of the preceding claims, i

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