ASSEMBLY DEVICE FOR A SIDE BEAM AND A CHASSIS CROSS BEAM OF A MOTOR VEHICLE, ASSEMBLY AND VEHICLE COMPRISING SUCH A DEVICE

Abstract

Assembly device for a side member and a chassis crossmember of a motor vehicle, assembly and vehicle comprising such a device. The invention relates to a device (1) for assembling a side member (2) and a chassis crossmember (3) of a motor vehicle, said assembly device (1) being formed of a single rigid metal piece, characterized in that the assembly device (1) has a portion (13) of a surface for welding the assembly device (1) and an anchoring element (4) of a rear axle (18) of the motor vehicle to the chassis (2, 3, 21) of this motor vehicle together. Figure for the abstract: Fig. 4

Description

Title of the invention: ASSEMBLY DEVICE OF A SIDER BEAM AND A CHASSIS CROSS BEAM OF A MOTOR VEHICLE, ASSEMBLY AND VEHICLE COMPRISING SUCH A DEVICE technical field

[0001] The invention relates to the automotive field and in particular the technical field dealing with the fixing of the rear axle of the motor vehicle to the chassis of this motor vehicle, when the motor vehicle is an electric or hybrid vehicle equipped with electric batteries or a fuel cell associated with at least one fuel cylinder, in particular of dihydrogen.

[0002] The area where the suspension components of a motor vehicle attach to its body constitutes an entry point for forces from the wheels onto the body. These forces are significant when the vehicle is loaded and / or traveling on rough roads and / or at high speed. To ensure acceptable structural integrity of the body under these forces, the mounting points A (outermost) and B (innermost) of the rear axle of this motor vehicle must be reinforced.

[0003] In particular, with regard to an electric or hybrid vehicle whose propulsion is provided by at least one electric motor drawing its energy from at least one electric battery, the size of these electric batteries necessitates optimization of the position of the internal and external mounting points of the rear axle of this motor vehicle. The same applies to an electric vehicle equipped with a fuel cell using dihydrogen as fuel stored in at least one cylinder, which is also bulky. Previous technique

[0004] A commercial vehicle is known in which the chassis has a gusset for assembling a side member and a crossmember. Such a commercial vehicle also has a rear axle mounting point A, comprising a bracket formed of two flanges joined together by a sheet metal piece attached to the side member. The bracket is not attached to the crossmember. The rigidity of the assembly formed by the gusset, the crossmember, the side member, and the rear axle mounting bracket is therefore not optimized.

[0005] Other electric motor vehicles are known in which the clevis for point A of the rear axle of this motor vehicle is screwed under the body of these motor vehicles. As a result, the clevis at point A does not contribute optimally to the structural integrity of the chassis.

[0006] A hybrid motor vehicle is also known in which the clevis for point A of attachment of the rear axle of this hybrid motor vehicle is bolted under the body of this hybrid motor vehicle. As a result, the clevis for point A does not contribute significantly to the structural integrity of the chassis.

[0007] An electric motor vehicle is also known in which the bracket at point A for attaching the rear axle of this electric motor vehicle is welded under the body of this hybrid motor vehicle. As a result, the bracket at point A does not contribute significantly to the structural integrity of the chassis.

[0008] The invention aims to overcome these drawbacks.

[0009] The invention therefore aims to provide a device for assembling a longitudinal member and a cross member of a motor vehicle chassis, in particular an electric or hybrid motor vehicle, which also allows for reinforcement of the clevis at point A.

[0010] The invention aims in particular to provide an assembly device which also allows for reinforcement of the connection between a cross member and a side member of the chassis of a motor vehicle and a mud flap of this motor vehicle.

[0011] But the invention also aims to provide such a compact assembly device which, because of its compact size, allows for saving and / or increasing space for receiving electric batteries to power the motor of an electric or hybrid vehicle.

[0012] But the invention also aims, as an alternative, to propose such a compact assembly device which, because of this compact size, allows for saving and / or increasing a space for receiving hydrogen bottles to supply a fuel cell for the motor of an electric vehicle.

[0013] The invention also aims to provide a compact assembly comprising such an assembly device and enabling the structural reinforcement of the chassis of the motor vehicle and / or enabling, due to this compact size, the saving and / or increasing of space for receiving electric batteries to power the motor of an electric or hybrid vehicle or hydrogen bottles to power a fuel cell for the motor of an electric vehicle.

[0014] The invention also aims to provide a motor vehicle, in particular an electric or hybrid vehicle, allowing an increase in length of a volume for receiving and installing electric batteries or hydrogen cylinders for supplying a fuel cell. Description of the invention

[0015] The invention therefore relates to an assembly device -or "gusset"- for a side member and a chassis crossmember of a motor vehicle, said assembly device being formed of a single rigid metal piece, characterized in that the assembly device has a portion of the assembly surface by welding one to the other, of the assembly device and of an anchoring element of a rear axle of the motor vehicle to the chassis of this motor vehicle.

[0016] Throughout the text: - The terms "front", "rear", "right", "left", "up", "down" and "lateral" are to be considered in relation to a vehicle in normal state of motion, - the XYZ coordinate system refers to a direct orthonormal coordinate system XYZ classically used in automotive design, in which the X axis designates the front-to-rear longitudinal direction of the vehicle, oriented towards the rear, the Y axis designates the transverse direction and is oriented laterally from the left to the right of the vehicle, the Z axis designates the vertical direction, and is oriented from bottom to top. Such a direct orthonormal coordinate system XYZ according to standard no. 0100112 is schematically represented in [Fig. 6].

[0017] In the automotive field, the side members and cross members forming the chassis are constituent elements of the rigidity of the vehicle's structure. The elongation axis of the side members extends globally along the X-axis of the direct orthonormal XYZ coordinate system classically used in automotive design, and the elongation axis of the cross members extends globally along the Y-axis of this same direct orthonormal XYZ coordinate system, with the side members and cross members extending substantially in the same plane orthogonal to the Z-axis of this same direct orthonormal XYZ coordinate system.

[0018] According to the invention, the assembly device is a multifunctional assembly device for achieving a rigid and compact welded assembly of a side member and a chassis crossmember, and at least one rear axle mounting element of the motor vehicle. Such a welded assembly device makes it possible to reinforce the rigidity of the motor vehicle's structure and to ensure that this structure can withstand the forces from the wheels transmitted to the body by the suspension components. Furthermore, such a compact assembly device also provides a compact rear axle mounting, with rear axle mounting points that do not extend forward beyond the crossmember, thus freeing up space extending in front of the crossmember for the electric batteries or hydrogen tanks supplying a fuel cell for this electric vehicle.

[0019] According to the invention, the assembly device has a generally concave main face delimiting the receiving volumes of the side member and the cross member. This concave main face is a superior face along the Z-axis of the The assembly device has a generally convex main face, opposite the concave main face, forming a lower face along the Z-axis of the direct orthonormal coordinate system when the assembly device is in the assembled state on the motor vehicle. According to the invention, the assembly device has a generally convex main face, opposite the concave main face, forming a lower face along the Z-axis of the direct orthonormal coordinate system when the assembly device is in the assembled state on the motor vehicle.

[0020] According to some embodiments, the portion of the surface area where the assembly device and the rear axle anchoring element are welded together is a portion of the concave main face of the assembly device. According to some other embodiments, the portion of the surface area where the assembly device and the rear axle anchoring element are welded together is a portion of the convex main face of the assembly device.

[0021] According to the invention, the assembly device is shaped so that it can be fixed by welding, in particular so that it can be fixed by welding, to the rear axle anchoring element of the motor vehicle on the chassis of that motor vehicle. The assembly device according to the invention constitutes a "structural node" enabling the transfer of forces from the vehicle's ground connection elements, at least to the side member and the chassis crossmember and to the body of the motor vehicle. These forces are all the greater when the vehicle is loaded or when the vehicle is an electric or hybrid vehicle with increased mass due to electric batteries and / or hydrogen fuel cell cylinders. These forces are all the greater when the vehicle is traveling at high speed and / or on a road with a degraded surface.

[0022] In some embodiments, the assembly device is formed by stamping a sheet of metal. However, any other means of obtaining such a rigid metal part is possible. In some embodiments, the assembly device is made of steel. In these embodiments, the assembly device is formed from a rigid metal part of substantially constant thickness.

[0023] According to certain embodiments, the assembly device according to the invention forms a clearance, called a longitudinal clearance, adapted to be able to receive said lateral spar, to be able to cooperate by cooperation of form with said lateral spar and to be able to secure the assembly device and said lateral spar by welding the assembly device and said lateral spar together.

[0024] Said longitudinal clearance extends longitudinally, along an axis substantially parallel to the X-axis of the direct orthonormal coordinate system XYZ (classically used in automotive design) and schematically represented in [Fig. 6], when the device assembly is arranged so as to cooperate with said side member, with the cross member and at least with the anchoring element of the rear axle of the motor vehicle.

[0025] According to certain embodiments, said longitudinal clearance of the assembly device is shaped to cooperate with—in particular to be able to be welded to—two adjacent free principal faces of said longeron with which the assembly device is intended to cooperate. According to these embodiments, the two adjacent free principal faces of said longeron are an internal principal face of said longeron and a lower principal face of said longeron in the direct orthonormal XYZ coordinate system.

[0026] According to certain embodiments, the longitudinal recess of the assembly device has an edge, referred to as the spar edge, intended to cooperate by contact with the lateral spar. The spar edge, when folded, forms at least one substantially flat extension arranged to be welded to a first face of the two adjacent free faces of the spar with which the assembly device is intended to cooperate. According to these embodiments, the first face of the two adjacent free faces of the lateral spar is an internal principal face of the lateral spar. According to these embodiments, the first face of the two adjacent free faces of the lateral spar is a principal face of the lateral spar substantially orthogonal to the Y-axis of the direct orthonormal coordinate system.A surface substantially orthogonal to the Y-axis of the direct orthonormal coordinate system is defined as a surface whose normal forms an angle of less than 10° with the Y-axis, taking into account the trapezoidal cross-section of said longitudinal member.

[0027] According to certain embodiments, said spar edge forms at least one second substantially planar extension arranged to cooperate with a second face, distinct from the first face, of the two adjacent free principal faces of the lateral spar with which the assembly device is intended to cooperate. According to these embodiments, the second face of the two adjacent free faces of the lateral spar is a lower principal face of the lateral spar. According to these embodiments, the second face of the two adjacent free faces of the lateral spar is a principal face of the lateral spar, extending in a plane substantially orthogonal to the Z-axis of the direct orthonormal coordinate system. A plane substantially orthogonal to the Z-axis of the direct orthonormal coordinate system is understood to be a surface whose normal forms an angle of less than 10° with the Z-axis.

[0028] According to certain embodiments, said longitudinal clearance of the assembly device has an edge, called the spar edge, intended to be in contact with said spar and provided with substantially flat extensions, of which: - at least one first extension - in particular a pair of first extensions opposite to each other - said at least one first extension - in particular the pair of the first extensions—being adapted to cooperate with a first face of the two free adjacent principal faces of the longeron with which the assembly device is intended to cooperate, and - at least one second extension—in particular, a pair of first extensions opposed to each other—said at least one second extension—in particular, the pair of second extensions—being adapted to cooperate with a second face of the two adjacent free principal faces of the spar with which the assembly device is intended to cooperate. In some embodiments, the first face of the two adjacent free faces of the spar is an internal principal face of said spar. In some embodiments, the second face of the two adjacent free faces of the spar is a lower principal face (orthogonal to the Z-axis of the direct orthonormal coordinate system) of said spar.

[0029] According to certain embodiments, said at least one first extension and said at least one second extension cooperate with the first and second free adjacent principal faces of the spar via a concave principal face portion of the assembly device. However, nothing prevents other embodiments from providing that said at least one first extension and said at least one second extension cooperate with the first and second free adjacent principal faces of the spar via a convex principal face portion of the assembly device.

[0030] Said edge of said longitudinal clearance delimits, from front to back (along the X-axis of the direct orthonormal coordinate system), a receiving volume for the lateral spar. The receiving volume for the lateral spar has a height extending along the Z-axis of the direct orthonormal coordinate system adapted to cooperate with a lateral spar of substantially the same height along the Z-axis of the direct orthonormal coordinate system.

[0031] According to certain embodiments, said longitudinal clearance is shaped to be able to receive the lateral stringer and to be crossed by said lateral stringer along the X axis of the direct orthonormal frame.

[0032] According to certain embodiments, the longitudinal clearance of the assembly device has an edge portion (not intended to be in contact with the side member), referred to as the rear axle anchor edge, intended to be in contact with the rear axle anchoring element of the motor vehicle and to secure the assembly device and the rear axle anchoring element of the motor vehicle by welding. According to certain embodiments, the rear axle anchor edge extends in a plane substantially orthogonal to the Y-axis of the direct orthonormal coordinate system and such that the rear axle anchor edge does not extend opposite the side member. A plane substantially orthogonal to the Y-axis of the direct orthonormal coordinate system is understood to be a plane whose normal forms an angle of less than 10° with the Y-axis.

[0033] According to certain embodiments, the assembly device according to the invention forms a groove, called the transverse groove, adapted to receive the cross member, to cooperate in form with the cross member, and to secure the assembly device to the cross member by welding the assembly device and the cross member together. This transverse groove defines a receiving volume for the cross member. The transverse groove of the assembly device has an elongation axis substantially parallel to the Y-axis of the direct orthonormal coordinate system when the assembly device is in its assembly position in the motor vehicle.

[0034] According to the invention, said transverse groove and said longitudinal clearance of the assembly device form a "T" extending in a plane orthogonal to the Z-axis of the direct orthonormal coordinate system. Said transverse groove and said longitudinal clearance have receiving axes for the cross member and, respectively, the side member, which are orthogonal to each other. In some embodiments, the receiving axes for the cross member and, respectively, the side member extend in two distinct parallel planes substantially orthogonal to the Z-axis of the direct orthonormal coordinate system. In some embodiments, the receiving axes for the cross member and, respectively, the side member extend in the same plane substantially orthogonal to the Z-axis of the direct orthonormal coordinate system.

[0035] According to certain embodiments, said transverse groove is shaped to cooperate with three free adjacent principal faces of the cross member with which the assembly device is intended to cooperate and to be welded to the cross member. According to these embodiments, the three free adjacent principal faces of said cross member are a front principal face (-X) of said cross member, a rear principal face (+X) of said cross member, and a lower principal face (-Z) of said cross member with respect to the direct orthonormal XYZ coordinate system.

[0036] According to certain embodiments, said transverse groove has an edge, called the cross-edge, delimiting upwards (+Z) the cross-sectional receiving volume. Said cross-edge has a substantially flat front extension (along the -X axis), extending horizontally and in a plane substantially orthogonal to the Z axis of the direct orthonormal coordinate system, and arranged to cooperate and be welded with a front edge of the cross-section. Said cross-edge has a substantially flat rear extension (along the +X axis), extending horizontally and in a plane substantially orthogonal to the Z axis of the direct orthonormal coordinate system, and arranged to cooperate and be welded with a rear edge of the cross-section.

[0037] According to certain embodiments, said transverse groove has, along its elongation axis substantially parallel to the Y-axis of the direct orthonormal frame, a first terminal end segment of cylindrical shape and having Front and rear extensions are arranged to cooperate with the edges of the crossmember. In certain embodiments, the transverse groove has, along its elongation axis substantially parallel to the Y-axis of the direct orthonormal coordinate system, a second section extending from the first section, flared from the first section, and having front and rear extensions arranged to be welded to an edge of the side member. According to these embodiments, the second section flares from the first section forwards and backwards along the X-axis and downwards along the Z-axis. The rigidity of the assembly device and the structure of the motor vehicle is increased.

[0038] According to certain embodiments, at least one extension of said cross member edge is intended to be in contact with the cross member and to be welded to the cross member by a portion of the concave main face of the assembly device.

[0039] The edge of the cross member of the transverse groove defines a cross member receiving volume. The cross member receiving volume has a height extending along the Z-axis of the direct orthonormal coordinate system, adapted to cooperate with a cross member of substantially the same height along the Z-axis of the direct orthonormal coordinate system. In certain embodiments, since the height of the cross member is less than the height of the side member, the height of the cross member receiving volume is less than the height of the side member receiving volume. The cross member receiving volume has a width extending along the X-axis of the direct orthonormal coordinate system, adapted to cooperate with a cross member of substantially the same width along the X-axis of the direct orthonormal coordinate system.

[0040] According to certain embodiments, said transverse groove is shaped to be able to receive a longitudinal end of the cross member, the longitudinal end of the cross member being substantially in abutment with the lateral stringer along the Y axis of the direct orthonormal frame.

[0041] According to certain embodiments, the assembly device has a surface for welding the assembly device to a rear support member for a vehicle lifting jack. The rigidity of the vehicle structure is increased, and the compactness of the assembly device and the rear axle anchoring element to the chassis is maintained.

[0042] According to certain embodiments, the surface for securing the assembly device to the rear support member for a lifting jack is substantially flat and extends over a portion of the convex main face of the assembly device—opposite to the concave main face of the assembly device—the part of the assembly device having this portion of the convex main face limiting the receiving volume of the longitudinal member. According to certain embodiments, the surface the bonding extends substantially in a plane orthogonal to the Z axis of the direct orthonormal coordinate system and is substantially horizontal.

[0043] Advantageously, the surface portion of the device according to the invention, for welded assembly to the rear axle anchoring element of the motor vehicle, is distinct from the surface portions for welding the device according to the invention to the side member and the crossmember, respectively. The surface portion, referred to as the rear axle anchoring surface, of the assembly device intended to be welded to the rear axle anchoring element extends in a plane, referred to as the rear axle anchoring plane, substantially orthogonal to the Y-axis of the direct orthonormal coordinate system, at one of the terminal ends of the assembly device (along this Y-axis) opposite the receiving end of the crossmember. Said rear axle anchoring surface is formed by at least one extension extending by folding in said anchoring plane from said anchoring edge.According to certain embodiments, each extension forming said rear axle anchorage surface extends in a plane orthogonal to the surface of attachment of the assembly device to the rear support element for lifting jack. The rigidity of the assembly device and the structure of the motor vehicle is reinforced, and the compactness of the assembly device and the rear axle anchorage element to the chassis is preserved.

[0044] In a motor vehicle comprising an assembly device according to the invention, each extension forming said rear axle anchorage surface is attached by welding to the anchorage element. In certain embodiments, the rear axle anchorage element of the motor vehicle is further attached by welding to a third free principal face of the side member.

[0045] According to some embodiments, the rear axle anchoring element to the chassis of the motor vehicle is a housing supporting a point A bearing of the vehicle, cooperating with a cylindrical articulation ring at the end of the rear axle suspension arm of the motor vehicle.

[0046] In some embodiments, the anchoring element comprises an internal fin (along the Y-axis of the direct orthonormal coordinate system) welded to the assembly device and an external reinforcement (along the Y-axis of the direct orthonormal coordinate system). The internal fin and the external reinforcement of the anchoring element are adapted to receive and retain an end bearing for attaching a rear suspension arm to the chassis of the motor vehicle. The support member and the external reinforcement are welded together. In some embodiments, the support member and the internal fin are welded together. In some embodiments, the internal fin and the external reinforcement of the anchoring element constitute an anchoring interface for a suspension arm. The internal fin and the external reinforcement provide between them a suitable air gap value to receive the end of the suspension arm and support a shaft adapted to cooperate with the suspension arm bearing.

[0047] According to certain embodiments, the support member is welded to at least one component selected from a mudguard and a frame of this motor vehicle. According to these embodiments, the assembly device provides structural continuity between: - longitudinal structural elements such as the side rail and the top plate, - transverse structural elements such as the cross member, and - vertical structural elements such as the stretcher forming a structural node.

[0048] The invention also extends to an assembly comprising an assembly device according to the invention, characterized in that it further comprises: - an anchoring element for the rear axle of this motor vehicle to the chassis of the motor vehicle, the anchoring element being mounted as a fixed unit to the assembly device by welding; - a rear support member for a vehicle lifting jack, the support member being mounted as a unit to the assembly device by welding.

[0049] According to certain embodiments, at least one of the assembly device, the rear axle anchoring element, and the rear support member is made of steel. According to certain embodiments, each of the assembly device, the rear axle anchoring element, and the rear support member is made of steel. The assembly according to the invention is a high-strength mechanical assembly. The assembly according to the invention makes it possible to form an efficient, rigid, and compact connection between the crossmember, the support member, and the drip edge, but also to reinforce the connection of this assembly with the rear axle anchoring element into a compact connection, thus limiting its size and providing space for the installation of an electric battery or fuel cylinder(s)—in particular, hydrogen—for a fuel cell.

[0050] The invention also extends to a motor vehicle comprising at least one assembly device according to the invention or at least one assembly according to the invention.

[0051] According to some embodiments, the motor vehicle is an electric or hybrid vehicle.

[0052] According to some embodiments, the motor vehicle is an electric vehicle equipped with electric batteries or a fuel cell powered by at least one bottle of dihydrogen.

[0053] In some embodiments, the motor vehicle is a utility vehicle. In some embodiments, the motor vehicle is a vehicle in which the powertrain is located at the front. However, there is nothing preventing the motor vehicle from being a vehicle in which the powertrain is located at the rear.

[0054] In some embodiments, the motor vehicle is a rear-wheel drive vehicle. In some embodiments, the motor vehicle is a front-wheel drive vehicle. In some embodiments, the motor vehicle is an all-wheel drive vehicle. Brief description of the drawings

[0055] Other features and advantages of the invention will become apparent from the following description. This description is purely illustrative and should be read in conjunction with the accompanying drawings, in which:

[0056] [Fig-1] [Fig. 1] is a perspective view of the convex main face of an assembly device according to the invention,

[0057] [Fig.2] [Fig.2] is a perspective view of the concave main face of a assembly device according to the invention,

[0058] [Fig.3] [Fig.3] is a cross-sectional representation (along a plane orthogonal to the X-axis of the direct orthonormal coordinate system of [Fig. 6]) and in rear view of a detail of a vehicle, an assembly and an assembly device according to the invention,

[0059] [Fig.4] [Fig.4] is a flat, bottom view of a detail of a motor vehicle according to the invention, in which the vehicle's ground contact elements are not shown,

[0060] [Fig. 5] [Fig. 5] is a perspective and bottom view of a detail of a vehicle automobile according to the invention, wherein the vehicle's ground contact elements are not shown, and

[0061] [Fig.6] [Fig.6] is a representation of a direct orthonormal coordinate system XYZ classically used in automotive design. Description of the implementation methods

[0062] For the purposes of the description, reference will be made to a direct orthonormal XYZ frame according to standard No. 0100112 represented in [Fig.6], in which the X axis designates the front-to-back longitudinal direction of the vehicle, oriented towards the rear, the Y axis designates the transverse direction and is oriented towards the right of the vehicle, the Z axis designates the vertical direction, and is oriented upwards.

[0063] The assembly device 1 or gusset shown in perspective in [Fig. 1] by its convex face 22 and in [Fig. 2] by its concave face 23 is formed from a single piece of stamped steel sheet. The assembly device 1 formed by stamping a The sheet metal plate has a folded shape chosen to provide the required flexural rigidity. Indeed, the assembly device 1 according to the invention is designed to allow for the rigid assembly of chassis and rear axle components of a motor vehicle, these chassis and rear axle components being subjected to significant mechanical stress due to their connection with the wheels of the moving motor vehicle. The folds imparted to the stamped steel sheet of the assembly device 1 according to the invention, in particular but not exclusively the folds formed between two orthogonal or substantially orthogonal wall sections, constitute reinforcements for the flexural rigidity of the assembly device 1 along the three XYZ axes of the direct orthonormal coordinate system.Furthermore, the assembly device 1 according to the invention is formed of a single compact piece allowing the assembly means of a lateral side member 2, a cross member 3 and at least one rear axle anchoring element 4 of the motor vehicle to be grouped into an optimized and minimal volume. This optimized volume makes it possible to provide an increased space for receiving electric battery cell(s) and / or fuel cell supply cylinder(s).

[0064] The assembly device 1 forms a groove, referred to as the transverse groove 6, adapted to receive a cross member (not shown in Figures 1 and 2), to cooperate in form with the cross member, and to allow the assembly device 1 to be joined to the cross member by welding the assembly device 1 and the cross member 3 together. The transverse groove 6 extends along an elongation axis identified in [Fig. 1] and 2 by reference numeral 15. The transverse groove 6 has a first section 42 with a free end end of the transverse groove 6 and a transverse cross-section (orthogonal to the elongation axis 15 of the transverse groove, the elongation axis 15 being parallel to the Y-axis of the direct orthonormal coordinate system) of substantially rectangular shape. The dimensions of the first section 42 of the transverse groove 6 are adjusted to the dimensions of the cross member.The first section 42 of said transverse groove 6 has an edge, called the cross member edge 29, delimiting upwards (+Z) a cross member receiving volume. Said cross member edge 29 has a substantially flat front extension 30 (along the -X axis), extending horizontally and in a plane substantially orthogonal to the Z axis of the direct orthonormal coordinate system and arranged to be welded with a front flange 40 of the cross member. Said cross member edge 29 has a substantially flat rear extension 39 (along the +X axis), extending horizontally and in a plane substantially orthogonal to the Z axis of the direct orthonormal coordinate system and arranged to be welded with a rear flange 41 of the cross member.

[0065] Said transverse groove 6 has a second flared section 43, extending outwards (+Y) the first section 42 along the axis 15 of said transverse groove 6 and receiving the cross member 3. The second section 43 is flared forwards and backwards along the X-axis and downwards along the Z-axis. The rigidity of the assembly device 1 and the structure of the motor vehicle is thus reinforced. The second flared section 43 has front extensions 44 and rear extensions 45 arranged so that each can be welded to a flange 46 of the side member. The folds formed between the first section 42 and the second section 43 of the assembly device 1 and by the front and rear extensions 30, 39 contribute to the reinforcement of the rigidity of the assembly device 1 according to the invention along the three axes XYZ of the direct orthonormal coordinate system.

[0066] The assembly device 1 also forms a recess, referred to as the longitudinal recess 5, adapted to receive said lateral spar (not shown in Figures 1 and 2), to cooperate by form cooperation with a lateral spar, and to join the assembly device 1 and the lateral spar by welding the assembly device and the lateral spar together. Said longitudinal recess 5 extends along an elongation axis identified in [Fig. 1] and 2 by reference numeral 14. Said longitudinal recess 5 is shaped to be welded to two adjacent free principal faces of the lateral spar with which the assembly device is intended to cooperate. According to these embodiments, the two adjacent free principal faces of said spar are an internal principal face of said spar and a lower principal face of said spar in the direct orthonormal XYZ coordinate system.The longitudinal clearance of the assembly device 1 shown in [Fig. 1] and 2 has an edge, referred to as the spar edge 19, intended to cooperate by contact with the lateral spar. This edge 19, by folding, forms at least one substantially flat extension 25 arranged to be welded to a first face of the two adjacent free faces of the spar with which the assembly device 1 is intended to cooperate. According to these embodiments, the first face of the two adjacent free faces of the lateral spar is an internal principal face of the lateral spar. According to these embodiments, the first face of the two adjacent free faces of the lateral spar is a principal face of said lateral spar substantially orthogonal to the Y-axis of the direct orthonormal coordinate system.The edge 19 of the longeron forms at least a second substantially planar extension 26 arranged to cooperate with a second face, distinct from the first face, of the two adjacent free principal faces of the lateral longeron with which the assembly device 1 is intended to cooperate. According to these embodiments, the second face of the two adjacent free faces of the lateral longeron is a lower principal face of the lateral longeron. According to these embodiments, the second face of the two adjacent free faces of the lateral longeron is a principal face of the lateral longeron, extending in a plane substantially orthogonal to the Z-axis of the direct orthonormal frame.

[0067] The assembly device 1 according to the invention has a stiffening fold 34 oriented in a plane orthogonal to the axis X chosen to allow reinforcement of the rigidity in bending, in particular along the axis 15 of elongation of said transverse groove 6.

[0068] The assembly device 1 also has a portion 13 of a welded assembly surface where the assembly device 1 and an anchoring element 4 of a rear axle 18 of the vehicle 20 are in contact with each other and attached to the chassis 21 of this vehicle 20. This portion 13 of the welded assembly surface of the assembly device 1 and the anchoring element 4 of the rear axle 18 extends in a plane orthogonal to the axis 15 of elongation of said transverse groove 6 and to the other of the terminal ends of the assembly device 1, opposite the free end 42 of said transverse groove 6.The portion 13 of the welded assembly surface of the assembly device 1 and the anchoring element 4 is formed by a plurality of extensions 28 extending from an edge, referred to as the rear axle anchoring edge 27, of said longitudinal clearance 5, said rear axle anchoring edge 27 not being intended to be in contact with and fixed to the lateral side member 2. The rear axle anchoring extensions 28 extend in a plane substantially orthogonal to the axis 15 of elongation of said transverse groove 6 and contribute, by virtue of the folds of said anchoring edge 27, to the rigidity of the assembly device 1.

[0069] The assembly device 1 also has a surface 7 for welding the assembly device 1 to a rear support member 8 for a vehicle lifting jack 20. The surface 7 for welding the assembly device 1 to the support member 8 is substantially flat and extends over a portion of the convex main face 22 of the assembly device 1, opposite the concave main face 23 of the assembly device 1. The surface 7 for welding extends substantially in a plane orthogonal to the Z-axis of the direct orthonormal coordinate system and is substantially horizontal. Said anchoring edge 27 of the surface 7 for welding also has at least one folded edge 31 which, due to these folds, contributes significantly to the flexural rigidity of the assembly device 1.The rigidity of the assembly device 1 and the structure of the vehicle 20 is reinforced, and the compactness of the assembly device 1 and the anchoring element 4 of the rear axle 18 to the chassis 21 is preserved.

[0070] An assembly 12 according to the invention, comprising an assembly device 1, is shown in [Fig. 3] in cross-section along a plane orthogonal to the X-axis of the direct orthonormal coordinate system. The assembly 12 comprises the assembly device 1 fixed to the crossmember 3 and the lateral side member 2, a rear support member 8 for a vehicle lifting jack 20, the support member 8 being mounted integrally with the assembly device 1 by welding onto the mounting surface 7 of the device 1. Assembly. The support member 8 is also welded to a sill 10 of the vehicle 20. The assembly 12 also includes an anchoring element 4 for a rear axle 21 of the vehicle 20 to the chassis 2,3 of the vehicle 20. The rear axle anchoring element 4 consists of an internal fin 11 and an external reinforcement 9 supporting a shaft 47 adapted to cooperate with a bearing of a suspension arm 32. In the embodiment shown, the internal fin 11 is welded to an extension 28 of the anchoring edge 27 of the assembly device 1. It is also possible to weld the internal fin 11 to one of the main faces of the lateral side member 2. In the embodiment shown, the external reinforcement 9 is welded to the rear support member 8 for a lifting jack. According to a particular embodiment, welded assemblies are spot welded assemblies.The rigidity and compactness of assembly 12 according to the invention allow for optimization of the available space for electric batteries and / or hydrogen fuel cell cylinders for an electric vehicle 20. Furthermore, it should be noted that the assembly device 1 integrated into assembly 12, comprising the assembly device 1, allows the vehicle 20 being assembled on an assembly line to be supported by a conveyor sled due to the substantially flat mounting surface 7.

[0071] A detail of an assembly 12 of a motor vehicle 20 according to the invention is shown in a flat, bottom view in [Fig. 4]. The motor vehicle 20 has a lateral side member 2 extending along the X-axis of the direct orthonormal coordinate system and a cross member 3 extending along the Y-axis of the direct orthonormal coordinate system. The lateral side member 2 and the cross member 3 constitute structural elements of the chassis 21 of the motor vehicle 20. As can be seen in [Fig. 4] (on the right of [Fig. 4]), a free space is provided at the front of the rear axle 18 of the electric vehicle 20 to accommodate electric batteries 24. The rear axle 18 of the electric vehicle 20 shown in [Fig. 4]4] comprises a first suspension arm 17 terminating at the front by a cylindrical articulation ring 38 including a articulation bearing allowing a pivot connection between the end 38 of the suspension arm 17 and a first element, called point A, for attaching the rear axle 18 to the chassis 21. A second arm of the suspension triangle terminates at the front by a cylindrical articulation ring 37 including a articulation bearing allowing a pivot connection between the end 37 of the second suspension arm and a second element 35, called point B, for additional attachment of the rear axle 18 to the chassis 2,3,21. The end of the suspension arm 17 forms a hollow cylinder receiving a bearing cooperating with a shaft 47 supported by the internal fin 11 and the external reinforcement 9 of the rear axle anchoring element 4 of the motor vehicle of a rear axle 18 of the electric vehicle 20 to the chassis 2,3,21 of this electric vehicle. The device 1. assembly, the longitudinal member 2, the cross member 3, the internal fin 11 of the anchoring element 4 of the rear axle 18 of the electric vehicle 20 to the chassis 2,3,21 of this electric vehicle, the external reinforcement 9 of this anchoring element 4 of the rear axle 18 of the electric vehicle 20, the rear support element 8 for a lifting jack and the drip edge 10, these elements being joined by welding, provide a rigid and compact anchoring of the rear axle 18 of an electric vehicle 20 to the chassis 21 of this electric vehicle 20.

[0072] The assembly 12 according to the invention comprises the assembly device 1. It also comprises an internal fin 11 and an external reinforcement 9 forming an anchoring element 4 for the rear axle 18 to the chassis 2, 3, 21 of the electric vehicle 20. The terms "internal" and "external," describing the fin and the reinforcement respectively, are defined with reference to the distance separating the fin and the reinforcement from a median plane of the vehicle, orthogonal to the Y-axis of the direct orthonormal coordinate system, the internal fin being closer to this median plane than the external reinforcement. The assembly 12 according to the invention also comprises a rear support element 8 for a lifting jack fixed by welding to the mounting surface 7 of the assembly device 1.The support member 8 is oriented in a plane substantially orthogonal to the X-axis of the direct orthonormal coordinate system and in a slightly forward position (along the X-axis of the direct orthonormal coordinate system) relative to a median plane of the first section 42 forming the free end of said transverse groove 6. Due to this slightly forward position of the support member 8, the rear landing gear anchoring element 4 18 can be brought closer to this median plane, so that the compactness, in particular the compactness along the X-axis of the direct orthonormal coordinate system, of the assembly 12 according to the invention is optimized. The inner fin 11 and the outer reinforcement 9 of the anchoring element 4 are welded to the support member 8, the inner fin 11 being further welded to the lateral side member 2 and to the assembly device 1. The support member 8 is also welded to the sill 10.This results in an optimized compactness of assembly 12 and a rigidity of assembly 12 allowing the installation of electric batteries 24, as shown in [Fig.5].

[0073] As shown in [Fig.4], the assembly device 1 according to the invention comprises a first free end section 42 adapted to form said transverse groove and having a front extension 30 fixed by a spot weld to a front edge 40 of the cross member 3 and a rear extension 39 fixed by a spot weld to a rear edge 41 of the cross member 3. The assembly device 1 according to the invention comprises a second section 43 flared from the first section 42 to said longitudinal clearance 5 and having a front extension 44 fixed by a spot weld to an edge 46 of the lateral side member 2 and a rear extension 45 fixed by a spot weld to the edge 46 of the lateral side member 2.

[0074] A general view of an assembly 12 of an electric vehicle 20 according to the invention is shown in a flat, bottom view in [Fig. 5]. The electric battery elements 24 The components of the electric vehicle 20 are arranged in the floor in front of the left assembly 12 of the vehicle and the right assembly 48 of the vehicle 20. The assembly 48 is symmetrical to the assembly 12 with respect to the median plane of the vehicle 20 and its constituent elements are not detailed again but reproduce the functionalities, properties and advantages provided by the assembly 12.

Claims

Demands

1. Assembly device (1) for joining a side member (2) and a cross member (3) of a motor vehicle chassis, said assembly device (1) being formed of a single rigid metal piece, characterized in that the assembly device (1) has a portion (13) of a surface for joining by welding one another, of the assembly device (1) and of an anchoring element (4) of a rear axle (18) of the motor vehicle to the chassis (2,3,21) of this motor vehicle.

2. Assembly device (1) according to claim 1, characterized in that it forms a clearance, said longitudinal clearance (5), adapted to be able to receive said lateral spar, to be able to cooperate by cooperation of form with said lateral spar (2) and to be able to secure the assembly device (1) with said lateral spar (2) by welding the assembly device (1) and said lateral spar (2) together.

3. Assembly device (1) according to any one of claims 1 or 2, characterized in that it forms a groove, called transverse groove (6), adapted to be able to receive the cross member (3), to cooperate in form cooperation with the cross member (3) and to be able to secure the assembly device (1) with the cross member (3) by welding the assembly device (1) and the cross member (3) together.

4. Assembly device (1) according to any one of claims 1 to 3, characterized in that the assembly device (1) has a surface (7) for welding the assembly device (1) to a rear support member (8) for a motor vehicle lifting jack.

5. Assembly device (1) according to claim 4, characterized in that the anchoring element (4) comprises an internal fin (11) welded to the assembly device (1) and an external reinforcement (9), the internal fin (11) and the external reinforcement (9) of the anchoring element (4) being adapted to receive and retain an end bearing (16) for fixing a rear suspension arm (17) of the motor vehicle (20) to the chassis (2,3) of this motor vehicle (20), the support member (8) and the external reinforcement (9) being welded together.

6. Assembly device (1) according to any one of claims 4 or 5, characterized in that the support member (8) is mounted securely by welding with at least one member selected from a mudguard (10) and a stretcher of this motor vehicle.

7. Assembly (12) comprising an assembly device (1) according to any one of claims 1 to 6, characterized in that it further comprises: - an anchoring element (4) for a rear axle (18) of this motor vehicle (20) to the chassis (2,3) of the motor vehicle, the anchoring element (4) being mounted integrally with the assembly device (1) by welding; - a rear support member (8) for a lifting jack of the motor vehicle, the support member (8) being mounted integrally with the assembly device (1) by welding.

8. Motor vehicle (20) comprising at least one assembly device (1) according to any one of claims 1 to 6 or at least one assembly (12) according to claim 7.

9. Motor vehicle (20) according to claim 8, characterized in that the motor vehicle (20) is an electric or hybrid vehicle.

10. Motor vehicle (20) according to any one of claims 8 or 9, characterized in that the motor vehicle (20) is an electric vehicle equipped with electric batteries or a fuel cell and at least one hydrogen cylinder.

11. Motor vehicle (20) according to any one of claims 8 to 10, characterized in that the motor vehicle (20) is a utility vehicle.

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