WO2021209695A1 - Device for assisting in the assembly of a motor vehicle rear end - Google Patents

Device for assisting in the assembly of a motor vehicle rear end Download PDF

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Publication number
WO2021209695A1
WO2021209695A1 PCT/FR2021/050402 FR2021050402W WO2021209695A1 WO 2021209695 A1 WO2021209695 A1 WO 2021209695A1 FR 2021050402 W FR2021050402 W FR 2021050402W WO 2021209695 A1 WO2021209695 A1 WO 2021209695A1
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WO
WIPO (PCT)
Prior art keywords
train
chassis
arm
suspension
compression
Prior art date
Application number
PCT/FR2021/050402
Other languages
French (fr)
Inventor
Francois Noel LEGRAND
Original Assignee
Psa Automobiles Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Psa Automobiles Sa filed Critical Psa Automobiles Sa
Priority to EP21715947.4A priority Critical patent/EP4136015A1/en
Publication of WO2021209695A1 publication Critical patent/WO2021209695A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
    • B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
    • B62D65/12—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components the sub-units or components being suspensions, brakes or wheel units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
    • B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
    • B62D65/024—Positioning of sub-units or components with respect to body shell or other sub-units or components

Definitions

  • the present invention relates to a device for assisting the assembly of an ar train using such a device.
  • Motor vehicles generally include a rear axle fixed under the body, which supports and guides the rear wheels by allowing a travel of the sus pensions.
  • a known type of rear axle as a deformable transverse train, presented in particular by document FR-A-2888559, comprises an axle having a general "H" shape, comprising on each side of the vehicle a suspension arm arranged longitu finally.
  • the front of the suspension arms is connected to the body of the vehicle by an articulation comprising an elastic connection capable of pivoting along a substantially transverse axis, the rear of these arms supporting the hub of the wheel.
  • the central bar of the “H” constitutes a deformable cross member arranged transversely, each end of which is rigidly fixed inside a suspension arm. This deformable transverse maintains the geometry of the suspension arms, while ensuring by a torsional deformation along its axis, the anti-roll bar function which limits the roll angle of the body.
  • the vehicle body is supported by suspension springs which are supported on a plate arranged at the rear of each longitudinal suspension arm.
  • a telescopic hydraulic shock absorber is installed in parallel with the suspension spring, inside or on the side of this spring.
  • a following operation consists in compressing these springs by a pivoting force of the longitudinal suspension arms upwards, around the axes of the front links, which positions the train at a defined height allowing the mounting of the shock absorbers.
  • the object of the present invention is in particular to avoid these drawbacks of the prior art.
  • this train comprising on each side at least one longi tudinal suspension arm having at one end a connection on the body of this vehicle, and at the other end a support receiving the base of a suspension spring which extends between the train and the chassis of the vehicle, characterized in that it comprises a support on which is mounted at least one compression arm configured to exert a thrust on the longitudinal suspension arm to push the train towards the frame and compress the suspension spring, the end of the compression arm being provided with a sliding surface
  • this sliding surface provided at the end of the compression arm of the device according to the invention makes it possible to exert the thrust force, generally vertical, on the train to push the latter towards the chassis while following the kinematics of the train which, linked at one end to the chassis, pivots around this end during the compression of the suspension spring and this, without damaging this train, due to the sliding.
  • the compression arm is a telescopic jack and has the sliding surface at its end.
  • this surface slide consists of a rolling ball.
  • the rolling ball cooperates with a concave complementary surface provided on the rear axle and in which the rolling ball can be housed, which facilitates the sliding of the ball relative to the train during the compression kinematics.
  • the device according to the invention further comprises means configured to allow the frame to be held in position, in particular along the X, Y and Z axes to allow the compression arm to effectively compress the spring of suspension up to a point allowing the attachment of the shock absorber for a train with a deformable cross member and the removal of the compression device in the case of a multi-link train.
  • the device allows the cross member to be raised to the point of attachment.
  • the shock absorber is located on the body and comes to the screwing point by the capping, the compression of the train serving to remove the compression device.
  • the invention also relates to a method of assisting the assembly of a rear axle on a vehicle chassis, using a device according to the invention, this train comprising on each side at least one arm of longitudinal suspension having at one end a connection to the chassis of this vehicle, and at the rear a support receiving the base of a suspension spring extending between the train and the chassis of the vehicle, characterized in that '' we mount the train in the open position on the chassis, we install the suspension spring between the chassis and the train, we block the chassis along the X, Y and Z axes, we exert a thrust on the longitudinal suspension arm to push back the train and compress the suspension spring, using a compression arm whose end provided with a sliding surface, exerts a pushing force on the train while following the kinematics of the train during of the compression of the suspension spring, the damping is then fixed eur and the spring compression is released.
  • the compression of the spring can take place up to the point of attachment of a damper for the deformable cross member and of the withdrawal of the spring compression device for the multi-arm.
  • the device and the method according to the invention make it possible to avoid the risks associated with mounting the compression spring when it is compressed. Furthermore, using a device according to the invention on each side of the chassis, it is possible to perform simultaneous positioning on each side, and furthermore makes it possible to take into account all the springs since the device acts on the train and not on the spring itself. same as well as the two types of rear axle namely multi-arm and deformable cross member.
  • FIG. 1 a view from below of the left rear part of a vehicle chassis equipped with a multi-link rear axle and a device according to the invention
  • FIG. 2 an enlarged view of Figure 1;
  • FIG. 3 a bottom view of the rear right part of a vehicle frame with a rear axle with a deformable cross member and of a device according to the invention
  • FIG. 4 a perspective view of the end of a push arm of a device according to the invention.
  • FIG. 1 is shown the underside of a vehicle chassis 1 and a mudguard 11, comprising a rear axle 2 which has, for each wheel, a rear transverse arm and a longitudinal suspension arm 3, pivotally mounted by elastic links to the chassis 1 of the vehicle at one of their ends and to the wheel pi vot at their opposite ends.
  • a vehicle chassis 1 and a mudguard 11 comprising a rear axle 2 which has, for each wheel, a rear transverse arm and a longitudinal suspension arm 3, pivotally mounted by elastic links to the chassis 1 of the vehicle at one of their ends and to the wheel pi vot at their opposite ends.
  • Such a train 2 is further associated with a shock absorber which comprises a rod connected to the frame 1 by an elastic connection and a body integral with the wheel pivot, and a coil spring not coaxial with the shock absorber.
  • the chassis 1 of the vehicle is therefore provided with a rear axle 2 fixed above in a so-called open position, which allows the installation of a non-compressed suspension spring between the chassis 1 and the longitudinal arm suspension 3 of said train 2.
  • the suspension spring must be compressed.
  • the chassis 1 of the vehicle is positioned in height and an assembly aid device according to the invention is installed under the chassis 1.
  • This device comprises a support which can be installed under the chassis 1 and on which are means are provided for blocking the frame 1 both along the X, Y and Z axes.
  • These means can be constituted by a jack, the rod 7 of which has fixing means 8 on the frame 1 which make it possible to block the chassis 1 along these three axes so that a compression arm 4 of the device can come to bear against the longitudinal suspension arm 3 of the rear axle 2 and push the latter back in order to compress the suspension spring.
  • the compression arm 4 consists of the rod of a cylindrical cylinder and has its end a sliding surface formed by a rolling ball 5.
  • This jack is preferably resistant to a pressure of one ton to allow the coil spring suspension to be compressed. In this way, when the rolling ball at the end 5 of the compression arm 4 bears against the longitudinal suspension arm 3, said end of the compression arm 4 can follow the kinematics of the longitudinal suspension arm 3 of the train 2.
  • the longitudinal suspension arm 3 has a concave surface 6 complementary to the surface of the rolling ball 5 which makes it possible to facilitate the rolling of the ball 5 against the longitudinal suspension arm 3 without friction and therefore without risk of damaging said longitudinal suspension arm 3.
  • the holding means 7, 8 are actuated in position of the device according to the invention to come and fix the frame 1 along the X, Y and Z axes and avoid lifting or any displacement of the frame 1 during compression.
  • the compression arm 4 is then actuated which abuts against the longitudinal suspension arm 3 at the level of the concave surface 6 so that the rolling ball 5 is housed in the concave surface 6 and can push the longitudinal suspension arm back. 3 along the z axis. Due to the pivoting attachment of the longitudinal suspension arm 3 to the chassis 1, the vertical movement along the z axis produces a pivoting around the attachment which causes kinematics of the longitudinal suspension arm 3 of the train 2 during compression of the suspension spring that the rolling ball 5 will see follow.
  • the sliding surface consisting of the ball 5 makes it possible to accept the variation in position of the longitudinal suspension arm 3 during compression without the risk of damaging this arm 3.
  • This compression therefore makes it possible to bring the coil spring suspension until the shock absorber can be fixed.
  • the compression is then released to the last feature of the device according to the invention.
  • the device according to the invention therefore makes it possible to mount different types of rear axle, such as those with a deformable cross member and those with multiple arms. For both types, it is thus possible to compress the arms of the rear axles equipped with the springs with the device while at the same time accepting the variation in position of the arms during compression.
  • all types of spring can be taken into account, regardless of the size variation.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention relates to a device for assisting in the assembly of a rear end (2) on a vehicle chassis (1), this rear end (2) comprising, on each side, at least one longitudinal suspension arm (3) having, at the front, a link to the chassis (1) of this vehicle and, at the rear, a support receiving the base of a suspension spring that extends between the rear end (2) and the chassis (1) of the vehicle. The invention comprises a support on which at least one compression arm (4) is mounted, configured to apply pressure onto a longitudinal suspension arm (3) in order to push back the rear end (2) and compress the suspension spring, the end of the compression arm (4) being provided with a sliding surface.

Description

DESCRIPTION DESCRIPTION
TITRE : DISPOSITIF D'AIDE AU MONTAGE D'UN TRAIN ARRIERETITLE: ASSEMBLY DEVICE FOR THE ASSEMBLY OF A REAR GEAR
DE VEHICULE AUTOMOBILE AUTOMOTIVE VEHICLE
[0001] La présente invention revendique la priorité de la demande française N° 2003693 dé posée le 14.04.2020 dont le contenu (texte, dessins et revendications) est ici incorporé par référence. The present invention claims the priority of French application No. 2003693 filed on 04.14.2020, the content of which (text, drawings and claims) is incorporated here by reference.
[0002] La présente invention concerne un dispositif d'aide au montage d'un train ar à l'aide d'un tel dispositif. The present invention relates to a device for assisting the assembly of an ar train using such a device.
[0003] Les véhicules automobiles comportent généralement un train arrière fixé sous la caisse, qui supporte et guide les roues arrière en permettant un débattement des sus pensions. Motor vehicles generally include a rear axle fixed under the body, which supports and guides the rear wheels by allowing a travel of the sus pensions.
[0004] Un type de train arrière connu appelé train à traverse déformable, présenté notamment par le document FR-A-2888559, comporte un essieu présentant une forme générale en « H », comprenant de chaque côté du véhicule un bras de suspension disposé longitu dinalement. L'avant des bras de suspension est relié à la caisse du véhicule par une ar ticulation comprenant une liaison élastique pouvant pivoter suivant un axe sensible ment transversal, l'arrière de ces bras supporte le moyeu de la roue. La barre centrale du « H » constitue une traverse déformable disposée transversalement, dont chaque extrémité est fixée de manière rigide à l'intérieur d'un bras de suspension. Cette tra verse déformable maintient la géométrie des bras de suspension, tout en assurant par une déformation en torsion suivant son axe, la fonction de barre anti-dévers qui limite l'angle de roulis de la caisse. [0004] A known type of rear axle called a deformable transverse train, presented in particular by document FR-A-2888559, comprises an axle having a general "H" shape, comprising on each side of the vehicle a suspension arm arranged longitu finally. The front of the suspension arms is connected to the body of the vehicle by an articulation comprising an elastic connection capable of pivoting along a substantially transverse axis, the rear of these arms supporting the hub of the wheel. The central bar of the “H” constitutes a deformable cross member arranged transversely, each end of which is rigidly fixed inside a suspension arm. This deformable transverse maintains the geometry of the suspension arms, while ensuring by a torsional deformation along its axis, the anti-roll bar function which limits the roll angle of the body.
[0005] La caisse du véhicule est supportée par des ressorts de suspension qui prennent appui sur un plateau disposé à l'arrière de chaque bras longitudinal de suspension. De chaque côté, un amortisseur hydraulique télescopique est installé en parallèle du ressort de suspension, à l'intérieur ou sur le côté de ce ressort. Pour l'assemblage de ce type de train arrière sous le véhicule, il est connu de positionner le train sous la caisse avec un outillage, et de fixer à cette caisse les axes des liaisons élastiques à l'avant des deux bras de suspension. The vehicle body is supported by suspension springs which are supported on a plate arranged at the rear of each longitudinal suspension arm. On each side, a telescopic hydraulic shock absorber is installed in parallel with the suspension spring, inside or on the side of this spring. For the assembly of this type of rear axle under the vehicle, it is known to position the train under the body with a tool, and to fix to this body the axes of the elastic links at the front of the two suspension arms.
[0006] Après avoir mis en place les ressorts de suspension, une opération suivante consiste à comprimer ces ressorts par un effort de pivotement des bras longitudinaux de suspen sion vers le haut, autour des axes des liaisons avant, ce qui positionne le train à une hauteur définie permettant le montage des amortisseurs. After having put in place the suspension springs, a following operation consists in compressing these springs by a pivoting force of the longitudinal suspension arms upwards, around the axes of the front links, which positions the train at a defined height allowing the mounting of the shock absorbers.
[0007] Ensuite l'outillage relâche le train arrière, les amortisseurs constituant des butées de fin de course des bras de suspension quand les ressorts de suspension se détendent. [0007] Then the tool releases the rear axle, the shock absorbers constituting end stops of the suspension arms when the suspension springs are relaxed.
[0008] Un problème qui se pose alors est de réaliser cette compression des ressorts de suspen sion par un moyen simple, économique, rapide et fiable, évitant tout risque d'accident. L'énergie détenue dans les ressorts de suspension comprimés étant importante, une dé tente brutale accidentelle peut blesser les opérateurs se trouvant à proximité. [0008] A problem which then arises is to achieve this compression of the suspension springs by a simple, economical, rapid and reliable means, avoiding any risk of accident. As the energy held in the compressed suspension springs is high, an accidental sudden tension can injure operators in the vicinity.
[0009] En variante, il est possible de monter le train arrière et les amortisseurs en position puis d’introduire le ressort de suspension comprimé entre le châssis et le train arrière à l’aide d’un outil qui comprime le ressort de suspension et le décomprime dans le train arrière. Un tel outil présente des inconvénients dans la mesure où il existe une grande diversité de ressorts arrière et que cet outil ne s’adapte pas à tous. De plus, la mise en place par compression du ressort reste d’une grande difficulté avec également des risques d’accidents pour l’opérateur qui utilise cet outil. La mise en place peut en outre occasionner un endommagement du train arrière lors de la décompression du ressort. [0009] As a variant, it is possible to mount the rear axle and the shock absorbers in position and then to introduce the suspension spring compressed between the chassis and the rear axle using a tool which compresses the suspension spring and decompresses it in the rear axle. Such a tool has drawbacks in that there is a wide variety of rear springs and this tool does not adapt to all. In addition, the installation by compression of the spring remains a great difficulty with also the risk of accidents for the operator who uses this tool. Installation can also cause damage to the rear axle when the spring is decompressed.
[0010] La présente invention a notamment pour but d'éviter ces inconvénients de la technique antérieure. The object of the present invention is in particular to avoid these drawbacks of the prior art.
[0011] Elle propose à cet effet un dispositif d'aide au montage d'un train arrière sur un châssis de véhicule, ce train comportant de chaque côté au moins un bras de suspension longi tudinal présentant à une extrémité une liaison sur la caisse de ce véhicule, et à l'autre extrémité un support recevant l'embase d'un ressort de suspension qui s’étend entre le train et le châssis du véhicule, caractérisé en ce qu'il comprend un support sur lequel est monté au moins un bras de compression configuré pour exercer une poussée sur le bras de suspension longitudinal pour repousser le train vers le châssis et comprimer le ressort de suspension, l’extrémité du bras de compression étant pourvue d’une surface de glissement For this purpose, it provides a device for assisting the assembly of a rear axle on a vehicle chassis, this train comprising on each side at least one longi tudinal suspension arm having at one end a connection on the body of this vehicle, and at the other end a support receiving the base of a suspension spring which extends between the train and the chassis of the vehicle, characterized in that it comprises a support on which is mounted at least one compression arm configured to exert a thrust on the longitudinal suspension arm to push the train towards the frame and compress the suspension spring, the end of the compression arm being provided with a sliding surface
[0012] Ainsi, de manière avantageuse, cette surface de glissement ménagée à l’extrémité du bras de compression du dispositif selon l’invention permet d’exercer la force de pous sée, généralement verticale, sur le train pour repousser celui-ci vers le châssis tout en suivant la cinématique du train qui, lié à une extrémité sur le châssis pivote autour de cette extrémité lors de la compression du ressort de suspension et ce, sans endomma ger ce train, du fait du glissement. [0012] Thus, advantageously, this sliding surface provided at the end of the compression arm of the device according to the invention makes it possible to exert the thrust force, generally vertical, on the train to push the latter towards the chassis while following the kinematics of the train which, linked at one end to the chassis, pivots around this end during the compression of the suspension spring and this, without damaging this train, due to the sliding.
[0013] Il est donc ainsi possible de monter le train arrière en position dite « ouverte » qui per met de mettre en place les ressorts de suspension sans qu’ils soient comprimés, puis de comprimer le train arrière pourvu des ressorts pour mettre en place l’amortisseur. [0013] It is therefore possible to mount the rear axle in the so-called "open" position which allows the suspension springs to be put in place without being compressed, then to compress the rear axle provided with the springs to set up the shock absorber.
[0014] Selon une forme de réalisation préférée, le bras de compression est un vérin télesco pique et présente à son extrémité la surface de glissement. De préférence, cette surface de glissement est constituée d’une bille de roulement. De préférence, la bille de roule ment coopère avec une surface complémentaire concave ménagée sur le train arrière et dans laquelle peut se loger la bille de roulement ce qui facilite le glissement de la bille par rapport au train lors de la cinématique de compression. According to a preferred embodiment, the compression arm is a telescopic jack and has the sliding surface at its end. Preferably, this surface slide consists of a rolling ball. Preferably, the rolling ball cooperates with a concave complementary surface provided on the rear axle and in which the rolling ball can be housed, which facilitates the sliding of the ball relative to the train during the compression kinematics.
[0015] De manière avantageuse, le dispositif selon l’invention comporte en outre des moyens configurés pour permettre le maintien en position du châssis, en particulier selon les axes X, Y et Z pour permettre au bras de compression de comprimer efficacement le ressort de suspension jusqu’à un point permettant la fixation de l’amortisseur pour un train à traverse déformable et le retrait du dispositif de compression dans le cas d’un train multi-bras. Advantageously, the device according to the invention further comprises means configured to allow the frame to be held in position, in particular along the X, Y and Z axes to allow the compression arm to effectively compress the spring of suspension up to a point allowing the attachment of the shock absorber for a train with a deformable cross member and the removal of the compression device in the case of a multi-link train.
[0016] Ainsi, pour une traverse déformable, l’amortisseur étant sur ladite traverse et devant être vissé en partie haute, le dispositif permet de remonter la traverse jusqu’au point de fixation. [0016] Thus, for a deformable cross member, the damper being on said cross member and having to be screwed in the upper part, the device allows the cross member to be raised to the point of attachment.
[0017] Dans le cas d’une traverse en Multi bras, l’amortisseur se trouve sur la caisse et viens au point de vissage par le coiffage, la compression du train servant à retirer le disposi tif de compression. [0017] In the case of a Multi-arm cross member, the shock absorber is located on the body and comes to the screwing point by the capping, the compression of the train serving to remove the compression device.
[0018] On évite ainsi avantageusement une déformation du train arrière, donc du châssis et de la caisse. [0018] This advantageously avoids a deformation of the rear axle, therefore of the chassis and of the body.
[0019] L’invention concerne également un procédé d’aide au montage d’un train arrière sur un châssis de véhicule, à l’aide d’un dispositif selon l’invention, ce train comportant de chaque côté au moins un bras de suspension longitudinal présentant à une extrémité une liaison sur le châssis de ce véhicule, et à l'arrière un support recevant l'embase d'un ressort de suspension s’étendant entre le train et le châssis du véhicule, caractérisé en ce qu'qu'on monte le train en position ouverte sur le châssis, on installe le ressort de suspension entre le châssis et le train, on bloque le châssis selon les axes X, Y et Z, on exerce une poussée sur le bras de suspension longitudinal pour repousser le train et comprimer le ressort de suspension, à l’aide d’un bras de compression dont l’extrémité pourvue d’une surface de glissement, permet d’exercer une force de poussée sur le train tout en suivant la cinématique du train lors de la compression du ressort de sus pension, on fixe alors l’amortisseur et on relâche la compression du ressort. The invention also relates to a method of assisting the assembly of a rear axle on a vehicle chassis, using a device according to the invention, this train comprising on each side at least one arm of longitudinal suspension having at one end a connection to the chassis of this vehicle, and at the rear a support receiving the base of a suspension spring extending between the train and the chassis of the vehicle, characterized in that '' we mount the train in the open position on the chassis, we install the suspension spring between the chassis and the train, we block the chassis along the X, Y and Z axes, we exert a thrust on the longitudinal suspension arm to push back the train and compress the suspension spring, using a compression arm whose end provided with a sliding surface, exerts a pushing force on the train while following the kinematics of the train during of the compression of the suspension spring, the damping is then fixed eur and the spring compression is released.
[0020] Ainsi, la compression du ressort peut s’opérer jusqu’au point de fixation d’un amortis seur pour la traverse déformable et du retrait du dispositif de compression du ressort pour le multi-bras. [0020] Thus, the compression of the spring can take place up to the point of attachment of a damper for the deformable cross member and of the withdrawal of the spring compression device for the multi-arm.
[0021] Le dispositif et le procédé selon l’invention permettent d’éviter les risques liés au montage du ressort de compression lorsqu’il est comprimé. Par ailleurs, en utilisant un dispositif selon l’invention de chaque côté du châssis, il est possible de réaliser une mise en place simultanée de chaque côté, et permet en outre de prendre en compte tous les ressorts puisque le dispositif agit sur le train et non sur le ressort lui-même ainsi que les deux types de train arrière à savoir multi bras et en traverse déformable. The device and the method according to the invention make it possible to avoid the risks associated with mounting the compression spring when it is compressed. Furthermore, using a device according to the invention on each side of the chassis, it is possible to perform simultaneous positioning on each side, and furthermore makes it possible to take into account all the springs since the device acts on the train and not on the spring itself. same as well as the two types of rear axle namely multi-arm and deformable cross member.
[0022] On décrira maintenant l’invention plus en détails en référence au dessin dans lequel les figures représentent : The invention will now be described in more detail with reference to the drawing in which the figures represent:
[0023] [Fig. 1] une vue du dessous de la partie arrière gauche d’un châssis de véhicule équipé d’un train arrière en multi-bras et d’un dispositif selon l’invention ; [0023] [Fig. 1] a view from below of the left rear part of a vehicle chassis equipped with a multi-link rear axle and a device according to the invention;
[0024] [Fig. 2] une vue agrandie de la figure 1 ; [0024] [Fig. 2] an enlarged view of Figure 1;
[0025] [Fig. 3] une vue de dessous de la partie arrière droite d’un châssis de véhicule avec un train arrière à traverse déformable et d’un dispositif selon l’invention ; [0025] [Fig. 3] a bottom view of the rear right part of a vehicle frame with a rear axle with a deformable cross member and of a device according to the invention;
[0026] [Fig. 4] une vue en perspective de l’extrémité d’un bras de poussée d’un dispositif se lon l’invention. [0026] [Fig. 4] a perspective view of the end of a push arm of a device according to the invention.
[0027] Comme on peut le voir sur la figure 1, est représenté le dessous d’un châssis 1 de véhi cule et un garde-boue 11, comportant un train arrière 2 qui présente, pour chaque roue, un bras transversal arrière et un bras longitudinal de suspension 3, montés pivotants par des liaisons élastiques au châssis 1 du véhicule à l'une de leurs extrémités et au pi vot de roue à leurs extrémités opposées. As can be seen in Figure 1, is shown the underside of a vehicle chassis 1 and a mudguard 11, comprising a rear axle 2 which has, for each wheel, a rear transverse arm and a longitudinal suspension arm 3, pivotally mounted by elastic links to the chassis 1 of the vehicle at one of their ends and to the wheel pi vot at their opposite ends.
[0028] A un tel train 2 sont en outre associés un amortisseur qui comporte une tige reliée au châssis 1 par une liaison élastique et un corps solidaire du pivot de roue, et un ressort hélicoïdal de suspension non coaxial à l’amortisseur. [0028] Such a train 2 is further associated with a shock absorber which comprises a rod connected to the frame 1 by an elastic connection and a body integral with the wheel pivot, and a coil spring not coaxial with the shock absorber.
[0029] Le châssis 1 du véhicule est donc pourvu d’un train arrière 2 fixé dessus dans une po sition dite ouverte, ce qui permet la mise en place d’un ressort de suspension non com primé entre le châssis 1 et le bras longitudinal de suspension 3 dudit train 2. The chassis 1 of the vehicle is therefore provided with a rear axle 2 fixed above in a so-called open position, which allows the installation of a non-compressed suspension spring between the chassis 1 and the longitudinal arm suspension 3 of said train 2.
[0030] Puis, pour pouvoir installer l’amortisseur et le fixer, le ressort de suspension doit être comprimé. Then, to be able to install the shock absorber and fix it, the suspension spring must be compressed.
[0031] A cet effet, le châssis 1 du véhicule est positionné en hauteur et un dispositif d’aide au montage selon l’invention est installé sous le châssis 1. Ce dispositif comporte un sup port installable sous le châssis 1 et sur lequel sont prévus des moyens permettant de bloquer le châssis 1 à la fois selon les axes X, Y et Z. Ces moyens peuvent être consti tués d’un vérin dont la tige 7 présente des moyens de fixation 8 sur le châssis 1 qui permettent de bloquer le châssis 1 selon ces trois axes de sorte qu’un bras de compres sion 4 du dispositif peut venir en appui contre le bras longitudinal de suspension 3 du train arrière 2 et repousser celui-ci pour comprimer le ressort de suspension. For this purpose, the chassis 1 of the vehicle is positioned in height and an assembly aid device according to the invention is installed under the chassis 1. This device comprises a support which can be installed under the chassis 1 and on which are means are provided for blocking the frame 1 both along the X, Y and Z axes. These means can be constituted by a jack, the rod 7 of which has fixing means 8 on the frame 1 which make it possible to block the chassis 1 along these three axes so that a compression arm 4 of the device can come to bear against the longitudinal suspension arm 3 of the rear axle 2 and push the latter back in order to compress the suspension spring.
[0032] Le bras de compression 4 est constitué de la tige d’un vérin cylindrique et présente à son extrémité une surface de glissement formée par une bille de roulement 5. Ce vérin est de préférence résistant à une pression d’une tonne pour permettre de comprimer le ressort hélicoïdal de suspension. De cette manière, lorsque la bille de roulement à l’ex trémité 5 du bras de compression 4 vient en appui contre le bras longitudinal de sus pension 3, ladite extrémité du bras de compression 4 peut suivre la cinématique du bras longitudinal de suspension 3 du train 2. The compression arm 4 consists of the rod of a cylindrical cylinder and has its end a sliding surface formed by a rolling ball 5. This jack is preferably resistant to a pressure of one ton to allow the coil spring suspension to be compressed. In this way, when the rolling ball at the end 5 of the compression arm 4 bears against the longitudinal suspension arm 3, said end of the compression arm 4 can follow the kinematics of the longitudinal suspension arm 3 of the train 2.
[0033] A cet effet, le bras longitudinal de suspension 3 présente une surface concave 6 com plémentaire de la surface de la bille de roulement 5 ce qui permet de faciliter le roule ment de la bille 5 contre le bras longitudinal de suspension 3 sans frottement et donc sans risque d’endommager ledit bras longitudinal de suspension 3. For this purpose, the longitudinal suspension arm 3 has a concave surface 6 complementary to the surface of the rolling ball 5 which makes it possible to facilitate the rolling of the ball 5 against the longitudinal suspension arm 3 without friction and therefore without risk of damaging said longitudinal suspension arm 3.
[0034] Ainsi, lorsque le châssis 1 est en position, on actionne les moyens de maintien 7, 8 en position du dispositif selon l’invention pour venir fixer le châssis 1 selon les axes X, Y et Z et éviter la levée ou tout déplacement du châssis 1 lors de la compression. On ac tionne alors le bras de compression 4 qui vient en butée contre le bras longitudinal de suspension 3 au niveau de la surface concave 6 de sorte que la bille de roulement 5 se loge dans la surface concave 6 et peut repousser le bras longitudinal de suspension 3 selon l’axe z. Du fait de la fixation pivotante du bras longitudinal de suspension 3 au châssis 1, le mouvement vertical selon l’axe z produit un pivotement autour de la fixa tion ce qui provoque une cinématique du bras longitudinal de suspension 3 du train 2 pendant la compression du ressort de suspension que la bille de roulement 5 va pou voir suivre. Thus, when the frame 1 is in position, the holding means 7, 8 are actuated in position of the device according to the invention to come and fix the frame 1 along the X, Y and Z axes and avoid lifting or any displacement of the frame 1 during compression. The compression arm 4 is then actuated which abuts against the longitudinal suspension arm 3 at the level of the concave surface 6 so that the rolling ball 5 is housed in the concave surface 6 and can push the longitudinal suspension arm back. 3 along the z axis. Due to the pivoting attachment of the longitudinal suspension arm 3 to the chassis 1, the vertical movement along the z axis produces a pivoting around the attachment which causes kinematics of the longitudinal suspension arm 3 of the train 2 during compression of the suspension spring that the rolling ball 5 will see follow.
[0035] Ainsi, la surface de glissement constituée de la bille 5 permet d’accepter la variation de position du bras longitudinal de suspension 3 pendant la compression sans risque d’endommagement de ce bras 3. [0035] Thus, the sliding surface consisting of the ball 5 makes it possible to accept the variation in position of the longitudinal suspension arm 3 during compression without the risk of damaging this arm 3.
[0036] Cette compression permet donc d’amener le ressort hélicoïdal de suspension jusqu’à ce qu’on puisse fixer l’amortisseur. La compression est ensuite relâchée jusqu’au re trait de dispositif selon l’invention. Le dispositif selon l’invention permet donc de monter des types de train arrière différent tels que ceux à traverse déformable et ceux à multi-bras. Pour les deux types, on peut ainsi comprimer les bras des trains arrière équipés des ressorts avec le dispositif tout en acceptant la variation de position des bras pendant la compression. Ainsi, de manière avantageuse, tous les types de ressort peuvent être pris en compte, quel que soit la variation de taille. [0036] This compression therefore makes it possible to bring the coil spring suspension until the shock absorber can be fixed. The compression is then released to the last feature of the device according to the invention. The device according to the invention therefore makes it possible to mount different types of rear axle, such as those with a deformable cross member and those with multiple arms. For both types, it is thus possible to compress the arms of the rear axles equipped with the springs with the device while at the same time accepting the variation in position of the arms during compression. Thus, advantageously, all types of spring can be taken into account, regardless of the size variation.
[0037] Ainsi de manière avantageuse, le monteur ne remet plus manuellement le ressort de suspension il n’y a donc plus de risque de laisser échapper le ressort, donc une plus grande sécurité de montage sans risque blessure. [0037] Thus, advantageously, the fitter no longer manually puts the suspension spring back in place, so there is no longer any risk of letting the spring escape, therefore greater assembly safety without the risk of injury.

Claims

REVENDICATIONS
[Revendication 1] Dispositif d'aide au montage d'un train (2) arrière sur un châssis (1) de véhicule, ce train (2) comportant de chaque côté au moins un bras longitudinal de suspension (3) présentant à l'avant une liaison sur le châssis (1) de ce véhicule, et à l'arrière un support recevant l'embase d'un ressort de suspension qui s’étend entre le train (2) et le châssis (1) du véhicule, caractérisé en ce qu'il comprend un support sur lequel est monté au moins un bras de compression (4) configuré pour exercer une poussée sur un bras longitudinal de suspension (3) pour repousser le train (2) et comprimer le ressort de suspension, l’extrémité du bras de compression (4) étant pourvue d’une surface de glissement. [Claim 1] A device for assisting the assembly of a rear axle (2) on a vehicle chassis (1), this train (2) comprising on each side at least one longitudinal suspension arm (3) presenting to the before a link on the chassis (1) of this vehicle, and at the rear a support receiving the base of a suspension spring which extends between the train (2) and the chassis (1) of the vehicle, characterized in that it comprises a support on which is mounted at least one compression arm (4) configured to exert a thrust on a longitudinal suspension arm (3) to push back the train (2) and compress the suspension spring, 'end of the compression arm (4) being provided with a sliding surface.
[Revendication 2] Dispositif selon la revendication 1, caractérisé en ce que le bras de compression (4) est un vérin télescopique et présente à son extrémité une surface de glissement. [Claim 2] Device according to claim 1, characterized in that the compression arm (4) is a telescopic cylinder and has at its end a sliding surface.
[Revendication 3] Dispositif selon l’une des revendications 1 et 2, caractérisé en ce que la surface de glissement est constituée d’une bille de roulement (5) ménagée à l’extrémité du bras de compression (4). [Claim 3] Device according to one of claims 1 and 2, characterized in that the sliding surface consists of a rolling ball (5) provided at the end of the compression arm (4).
[Revendication 4] Dispositif selon la revendication 3, caractérisé en ce que la bille de roulement est logeable dans une surface concave (6) ménagée sur le bras longitudinal de suspension (3) ce qui facilite le glissement de la bille (5) par rapport au train (2) lors de la cinématique de compression.[Claim 4] Device according to claim 3, characterized in that the rolling ball is accommodated in a concave surface (6) provided on the longitudinal suspension arm (3) which facilitates the sliding of the ball (5) relative to to the train (2) during the compression kinematics.
[Revendication 5] Procédé d’aide au montage d’un train (2) arrière sur un châssis (1) de véhicule, à l’aide d’un dispositif selon l’une des revendications 1 à 4, ce train (2) comportant de chaque côté au moins un bras longitudinal de suspension (3) présentant à une extrémité une liaison sur le châssis (1) de ce véhicule, et à l'arrière un support recevant l'embase d'un ressort de suspension s’étendant entre le train (2) et le châssis (1) du véhicule, caractérisé en ce qu'on monte le train (2) en position ouverte sur le châssis (1), on installe le ressort de suspension entre le châssis (1) et le train (2), on bloque le châssis selon les axes X, Y et Z, on exerce une poussée sur le bras de suspension longitudinal (3) pour repousser le train (2) et comprimer le ressort de suspension, à l’aide d’un bras de compression (4) dont l’extrémité pourvue d’une surface de glissement, permet d’exercer une force de poussée sur le train (2) tout en suivant la cinématique du train (2) lors de la compression du ressort de suspension, on fixe alors l’amortisseur et on relâche la compression du ressort. [Claim 5] A method of assisting the assembly of a rear train (2) on a vehicle chassis (1), using a device according to one of claims 1 to 4, this train (2) comprising on each side at least one longitudinal suspension arm (3) having at one end a connection to the chassis (1) of this vehicle, and at the rear a support receiving the base of an extending suspension spring between the train (2) and the chassis (1) of the vehicle, characterized in that the train (2) is mounted in the open position on the chassis (1), the suspension spring is installed between the chassis (1) and the train (2), we block the chassis along the X, Y and Z axes, we exert a thrust on the longitudinal suspension arm (3) to push the train (2) and compress the suspension spring, using a compression arm (4), the end of which is provided with a sliding surface, makes it possible to exert a pushing force on the train (2) while following the kinematics of the train (2) when the suspension spring is compressed, the shock absorber is then fixed and the compression of the spring is released.
PCT/FR2021/050402 2020-04-14 2021-03-10 Device for assisting in the assembly of a motor vehicle rear end WO2021209695A1 (en)

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EP21715947.4A EP4136015A1 (en) 2020-04-14 2021-03-10 Device for assisting in the assembly of a motor vehicle rear end

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FR2003693A FR3109135A1 (en) 2020-04-14 2020-04-14 ASSEMBLY DEVICE FOR THE ASSEMBLY OF A MOTOR VEHICLE REAR TRAIN
FR2003693 2020-04-14

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2003693A1 (en) 1968-03-12 1969-11-14 Alfa Laval Ab PLATE HEAT EXCHANGER
US4736505A (en) * 1986-07-25 1988-04-12 Vanbeber Vernie F Apparatus for replacing MacPherson struts
FR2888559A1 (en) 2005-07-15 2007-01-19 Renault Sas METHOD FOR ASSEMBLING AN AXLE OF A MOTOR VEHICLE OF THE TYPE PROVIDED WITH SUSPENSION ARMS AND A RAIL MOUNTED BETWEEN SAID ARM AND CORRESPONDING AXLE
WO2016075378A1 (en) * 2014-11-13 2016-05-19 Peugeot Citroen Automobiles Sa Machine for mounting a vehicle rear axle, comprising a system for anchoring the body shell and a means for lifting each suspension arm

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2003693A1 (en) 1968-03-12 1969-11-14 Alfa Laval Ab PLATE HEAT EXCHANGER
US4736505A (en) * 1986-07-25 1988-04-12 Vanbeber Vernie F Apparatus for replacing MacPherson struts
FR2888559A1 (en) 2005-07-15 2007-01-19 Renault Sas METHOD FOR ASSEMBLING AN AXLE OF A MOTOR VEHICLE OF THE TYPE PROVIDED WITH SUSPENSION ARMS AND A RAIL MOUNTED BETWEEN SAID ARM AND CORRESPONDING AXLE
WO2016075378A1 (en) * 2014-11-13 2016-05-19 Peugeot Citroen Automobiles Sa Machine for mounting a vehicle rear axle, comprising a system for anchoring the body shell and a means for lifting each suspension arm

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FR3109135A1 (en) 2021-10-15

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