FR2898543A1 - Rear flexible axle for motor vehicle, has crosspiece with central part separated vertically towards top with respect to anchoring points of crosspiece, where crosspiece connects longitudinal arms at level of points - Google Patents

Rear flexible axle for motor vehicle, has crosspiece with central part separated vertically towards top with respect to anchoring points of crosspiece, where crosspiece connects longitudinal arms at level of points Download PDF

Info

Publication number
FR2898543A1
FR2898543A1 FR0602416A FR0602416A FR2898543A1 FR 2898543 A1 FR2898543 A1 FR 2898543A1 FR 0602416 A FR0602416 A FR 0602416A FR 0602416 A FR0602416 A FR 0602416A FR 2898543 A1 FR2898543 A1 FR 2898543A1
Authority
FR
France
Prior art keywords
vehicle
longitudinal
axis
crosspiece
flexible axle
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
FR0602416A
Other languages
French (fr)
Inventor
Remi Rollet
Laurent Urrutia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Priority to FR0602416A priority Critical patent/FR2898543A1/en
Publication of FR2898543A1 publication Critical patent/FR2898543A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
    • B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
    • B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
    • B60G21/051—Trailing arm twist beam axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/20—Semi-rigid axle suspensions
    • B60G2200/21—Trailing arms connected by a torsional beam, i.e. twist-beam axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/30—Rigid axle suspensions
    • B60G2200/34—Stabilising mechanisms, e.g. for lateral stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/30—Rigid axle suspensions
    • B60G2200/34—Stabilising mechanisms, e.g. for lateral stability
    • B60G2200/341—Panhard rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/13—Torsion spring
    • B60G2202/136—Twist-beam type arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/13—Torsion spring
    • B60G2202/136—Twist-beam type arrangement
    • B60G2202/1362—Twist-beam type arrangement including a second torsional element, e.g. second beam, stabiliser bar or tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/012—Hollow or tubular elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/20—Constructional features of semi-rigid axles, e.g. twist beam type axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/81—Shaping

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The axle has an exhaust pipe (17) situated between a ground clearance of a vehicle and the axle. The pipe extends along a median longitudinal axis (X) of the vehicle. Two longitudinal arms (10) support wheels and have fixation axle (14) at body shell of the vehicle. A crosspiece (11) connects the arms at a level of anchoring points. The crosspiece has a central part which is forwarded along the axis of the vehicle towards front of the vehicle with respect to the axis The part is separated vertically towards top with respect to the anchoring points of the crosspiece.

Description

ESSIEU SOUPLE ARRIERE DE VEHICULE AUTOMOBILE À BARRE PANHARD ET TRAVERSEREAR AXLE OF MOTOR VEHICLE WITH PANHARD AND TRAVERSE BAR

CINTREE, ET VEHICULE CORRESPONDANT L'invention concerne un essieu souple arrière de véhicule automobile à barre Panhard et traverse cintrée et un véhicule pourvu d'un tel essieu. Habituellement, le tuyau d'échappement des véhicules automobiles passe au dessus du train arrière, en particulier au dessus de la traverse de l'essieu, ce qui peut nécessiter ]la réalisation d'un coude au niveau du tuyau. Un tel agencement réduit l'espace disponible au dessus du train, et gêne l'implantation dans le plancher du véhicule de bacs de rangement volumineux. Le passage du tuyau d'échappement sous le train arrière permettrait d'augmenter cet espace disponible. La figure 1 représente une vue de trois quarts d'un essieu arrière comportant des bras longitudinaux 1 reliés par une traverse 2 rectiligne, ]l'extrémité avant 3 de chaque bras étant reliée à la caisse du véhicule en un point A, leur autre extrémité 4 portant une roue. Pour des raisons de maintien et de guidage latéral du train arrière dans ses mouvements de suspension, une barre 5, dite barre Panhard, est disposée dans un plan horizontal proche de l'axe de rotation des roues arrière, et relie l'un des bras 1 à la caisse du véhicule. Sur cette figure, le tuyau d'échappement 6 est placé sous l'essieu, la référence 7 désignant le plancher du véhicule. La figure 2 montre les limites d'un tel agencement, dans lequel l'essieu ne peut débattre suivant l'axe Z sans venir en contact avec l'échappement 1 lors d'un débattement maximal en position de rebond (position représentée en traits pleins). La position représentée en traits pointillés sur la figure 2 correspond à un débattement maximal au choc.  The invention relates to a rear axle of a motor vehicle with Panhard rod and curved cross member and a vehicle provided with such an axle. SUMMARY OF THE INVENTION Usually, the exhaust pipe of motor vehicles passes over the rear axle, especially above the axle beam, which may require the realization of a bend at the pipe. Such an arrangement reduces the space available above the train, and hinders the installation in the floor of the vehicle large storage bins. The passage of the exhaust pipe under the rear train would increase this available space. FIG. 1 shows a three-quarter view of a rear axle comprising longitudinal arms 1 connected by a straight cross-member 2, the front end 3 of each arm being connected to the vehicle body at a point A, their other end 4 carrying a wheel. For reasons of support and lateral guidance of the rear suspension suspension, a bar 5, said Panhard bar, is disposed in a horizontal plane close to the axis of rotation of the rear wheels, and connects one of the arms 1 at the vehicle's cash desk. In this figure, the exhaust pipe 6 is placed under the axle, the reference 7 designating the floor of the vehicle. FIG. 2 shows the limits of such an arrangement, in which the axle can not debate along the Z axis without coming into contact with the escapement 1 during a maximum deflection in the rebound position (position represented in solid lines ). The position shown in dashed lines in Figure 2 corresponds to a maximum impact travel.

Le document EP 1 297 977 décrit un essieu dont la traverse est formée de deux portions latérales solidaires des bras longitudinaux et d'une portion centrale rectiligne à profil ouvert, les portions latérales étant inclinées par rapport à la portion centrale. Toutefois, l'inclinaison des portions latérales interdit le passage d'un échappement sous l'essieu. L'invention vise à pallier ces inconvénients en proposant un essieu arrière dont la traverse présente une partie avancée et décalée  The document EP 1 297 977 describes an axle whose cross-member is formed of two lateral portions integral with the longitudinal arms and of a rectilinear central portion with an open profile, the lateral portions being inclined with respect to the central portion. However, the inclination of the side portions prohibits the passage of an exhaust under the axle. The invention aims to overcome these disadvantages by providing a rear axle whose cross has an advanced and offset part

vers le haut permettant un débattement vertical de la traverse sans risque d'interférence avec un tuyau d'échappement situé sous l'essieu arrière. Cette configuration de l'essieu permet d'utiliser l'espace libre juste derrière l'essieu pour la mise en place d'éléments du véhicule.  upwards allowing a vertical travel of the cross without risk of interference with an exhaust pipe located under the rear axle. This configuration of the axle makes it possible to use the free space just behind the axle for the installation of elements of the vehicle.

A cet effet, l'objet de l'invention concerne un essieu souple arrière pour un véhicule automobile comportant un tuyau d'échappement situé entre la garde au sol du véhicule et l'essieu arrière et s'étendant le long de l'axe longitudinal médian du véhicule, l'essieu comprenant deux bras longitudinaux supportant les roues et comportant un axe de fixation à la caisse du véhicule, une traverse reliant les bras longitudinaux au niveau de points d'ancrage, et une barre Panhard dont une extrémité est solidaire d'un bras longitudinal et l'autre extrémité est destinée à être fixée à la caisse du véhicule, caractérisé en ce qu'au moins la partie centrale de la traverse est avancée suivant l'axe longitudinal X du véhicule vers l'avant du véhicule par rapport à l'axe des roues et décalée verticalement vers le haut par rapport aux points d'ancrage de la traverse aux bras longitudinaux, afin d'éviter toute interférence de la traverse avec d'autres éléments du véhicule lors des chocs et rebonds de l'essieu.  To this end, the object of the invention relates to a rear flexible axle for a motor vehicle having an exhaust pipe located between the ground clearance of the vehicle and the rear axle and extending along the longitudinal axis. median of the vehicle, the axle comprising two longitudinal arms supporting the wheels and having a fixing pin to the vehicle body, a cross member connecting the longitudinal arms at anchor points, and a Panhard bar whose end is secured to a longitudinal arm and the other end is intended to be fixed to the vehicle body, characterized in that at least the central portion of the crossbar is advanced along the longitudinal axis X of the vehicle towards the front of the vehicle by relative to the axle of the wheels and offset vertically upwards relative to the anchoring points of the cross member to the longitudinal arms, in order to avoid any interference of the cross member with other elements of the vehicle. e during shocks and rebounds of the axle.

Dans un premier mode de réalisation, X, Y, Z désignant les axes longitudinal, transversal et vertical du véhicule, la traverse présente, au moins dans sa partie centrale, un cintrage dans le plan (YZ) du véhicule dirigé vers le haut, et les points d'ancrage de la traverse aux bras longitudinaux sont avancés suivant l'axe longitudinal (X) vers l'avant du véhicule par rapport à l'axe des roues. De préférence, les points d'ancrage de la traverse aux bras longitudinaux sont alors situés à une distance de l'axe des roues comprise entre environ un tiers et la moitié de la distance entre l'axe des roues et l'axe de fixation des bras longitudinaux sur la caisse du véhicule Dans un deuxième mode de réalisation, X, Y, Z désignant les axes longitudinal, transversal et vertical du véhicule, la traverse présente, au moins dans sa partie centrale, un cintrage dans le plan (YZ) du véhicule et un cintrage dans le plan (XY) du véhicule, la partie cintrée s'étendant vers l'avant du véhicule et au dessus des bras longitudinaux. Dans ces deux modes de réalisation, le cintrage dans le plan YZ permet de limiter l'interférence de la traverse avec un élément tel que  In a first embodiment, X, Y, Z denoting the longitudinal, transverse and vertical axes of the vehicle, the crossbar has, at least in its central part, a bending in the plane (YZ) of the vehicle directed upwards, and the anchoring points of the cross member to the longitudinal arms are advanced along the longitudinal axis (X) towards the front of the vehicle relative to the axis of the wheels. Preferably, the anchoring points of the cross member to the longitudinal arms are then located at a distance from the axis of the wheels of between approximately one-third and one-half the distance between the axis of the wheels and the axis of attachment of the wheels. longitudinal arms on the body of the vehicle In a second embodiment, X, Y, Z designating the longitudinal, transverse and vertical axes of the vehicle, the crossbar has, at least in its central part, a bending in the plane (YZ) of the vehicle and a bend in the plane (XY) of the vehicle, the curved portion extending towards the front of the vehicle and above the longitudinal arms. In these two embodiments, the bending in the YZ plane makes it possible to limit the interference of the cross member with an element such that

l'échappement lors d'un rebond. Le cintrage maximal est limité par le plancher du véhicule lors d'un débattement maximal au cours d'un choc. Ce cintrage ne permet toutefois pas d'éviter l'interférence lors d'un rebond du véhicule, la traverse s'éloignant du plancher du véhicule. L'avancement de la partie centrale par rapport à l'axe des roues, ou son cintrage dans le plan XY, permet alors de limiter le débattement de la partie centrale en l'avançant vers l'avant du véhicule, et d'éviter toute interférence avec l'échappement.  the exhaust during a rebound. Maximum bending is limited by the floor of the vehicle during maximum travel during a crash. This bending, however, does not prevent interference during a rebound of the vehicle, the crossbar away from the vehicle floor. The advancement of the central part relative to the axis of the wheels, or its bending in the XY plane, then makes it possible to limit the deflection of the central part by advancing it towards the front of the vehicle, and to avoid any interference with the exhaust.

Par ailleurs, pour réaliser un essieu souple à barre Panhard présentant un bon comportement élasto-cinématique, il est préférable de placer la traverse le plus près possible de l'axe des roues, ce qui augmente le débattement auquel est soumis la traverse et l'encombrement de l'essieu. La réalisation d'un cintrage dans le plan XY selon le deuxième mode de réalisation, permet, en déplaçant la partie centrale de la traverse vers l'avant du véhicule, de réduire le débattement de la partie centrale sans avoir à déplacer les points d'ancrage de la traverse sur les bras longitudinaux, c'est-à-dire sans avoir à augmenter la longueur des bras entre l'axe des roues et les points d'ancrage de la traverse, ce qui augmente la rigidité latérale de l'essieu. Une telle configuration permet également de réduire l'encombrement de l'essieu. Dans une variante, la traverse est cintrée sur toute sa longueur. Ceci permet d'augmenter la raideur en flexion de la traverse suivant les axes X et Z pour le deuxième mode de réalisation. Avantageusement, la traverse présente un profil fermé. La forme du profil est choisie en fonction du comportement souhaité de la traverse, il peut s'agir par exemple d'un profil en V, en forme d'étoile à trois branches, ou de tout autre profil approprié. Un tel essieu présente un bon comportement en virage, en optimisant le braquage du train induit par le roulis ainsi que le carrossage du train induit par le roulis. Ces comportements sont notamment optimisés pour un profil fermé en V couché pointant vers l'arrière du véhicule. Avantageusement, l'essieu comporte un tirant dont chaque extrémité est fixée à un bras longitudinal, le tirant s'étendant transversalement aux bras, à proximité de la traverse. Ce tirant  Moreover, to make a flexible axle Panhard bar having a good elasto-kinematic behavior, it is preferable to place the cross member as close as possible to the axis of the wheels, which increases the deflection which is subjected to the cross and the congestion of the axle. The embodiment of a bend in the XY plane according to the second embodiment, by moving the central part of the cross member towards the front of the vehicle, makes it possible to reduce the travel of the central part without having to move the points of rotation. anchorage of the cross member on the longitudinal arms, that is to say without having to increase the length of the arms between the wheel axis and the anchor points of the cross member, which increases the lateral rigidity of the axle . Such a configuration also reduces the size of the axle. In a variant, the cross is bent over its entire length. This makes it possible to increase the bending stiffness of the cross member along the X and Z axes for the second embodiment. Advantageously, the cross member has a closed profile. The shape of the profile is chosen according to the desired behavior of the cross member, it may be for example a V-shaped profile, star-shaped with three branches, or any other suitable profile. Such an axle has good cornering behavior, optimizing the steering of the train induced by the roll and the camber of the train induced by the roll. These behaviors are particularly optimized for a closed V-shaped profile pointing towards the rear of the vehicle. Advantageously, the axle comprises a tie rod, each end of which is fixed to a longitudinal arm, the tie rod extending transversely to the arms, close to the cross member. This pulling

participe au travail de traction/compression de l'essieu et permet d'optimiser le braquage des roues sous effort transversal. Le tirant peut être situé en avant ou en arrière de la traverse. L'invention concerne également un véhicule automobile caractérisé en ce qu'il comporte un essieu souple arrière selon l'invention, et en ce qu'il comporte un tuyau d'échappement situé entre sa garde au sol et l'essieu arrière, et s'étendant sensiblement au centre du véhicule suivant son axe longitudinal. L'invention est maintenant décrite en référence aux dessins 10 annexés, non limitatifs, dans lesquels : - la figure 1 est une vue de 3/4 d'un essieu souple arrière selon l'art antérieur ; la figure 2 est une vue de côté de l'essieu de la figure 1 en débattement vertical ; 15 - la figure 3 est une vue de 3/4 d'un essieu souple selon un mode de réalisation de l'invention ; - la figure 4 est une vue de l'essieu de la figure 3 dans le plan YZ ; - la figure 5 est une vue de l'essieu de la figure 3 dans le 20 planXY; - la figure 6 une vue de 3/4 d'un essieu souple selon une variante du mode de réalisation de l'invention des figures 3à5 L'essieu selon l'invention représenté figure 3 comprend deux bras 25 longitudinaux 10, une traverse 11 et une barre Panhard 12. Chaque bras longitudinal comprend une extrémité avant 13 montée à pivot sur la caisse C du véhicule autour d'un axe 14 sensiblement parallèle à l'axe de rotation des roues, et une extrémité arrière 15 supportant une roue (non représentée) tournant autour d'un 30 axe 16 de rotation. Les extrémités de la traverse 11 sont fixées sur les bras longitudinaux 10 au niveau de points d'ancrage. La barre Panhard 12 est disposée dans un plan horizontal proche de l'axe de rotation des roues arrière, et s'étend entre la traverse et les roues, une de ses extrémités étant fixée à un bras longitudinal, son autre extrémité étant 35 solidaire de la caisse C du véhicule. Sur la figure 3 est également représenté un tuyau d'échappement 17 situé sous l'essieu souple, entre l'essieu et la garde au sol du  participates in the work of traction / compression of the axle and optimizes the turning of the wheels under transverse effort. The tie rod may be located in front of or behind the transom. The invention also relates to a motor vehicle characterized in that it comprises a rear flexible axle according to the invention, and in that it comprises an exhaust pipe located between its ground clearance and the rear axle, and extending substantially to the center of the vehicle along its longitudinal axis. The invention is now described with reference to the accompanying drawings, which are not limiting, in which: FIG. 1 is a view of 3/4 of a rear flexible axle according to the prior art; Figure 2 is a side view of the axle of Figure 1 in vertical displacement; Figure 3 is a 3/4 view of a flexible axle according to one embodiment of the invention; FIG. 4 is a view of the axle of FIG. 3 in the YZ plane; Figure 5 is a view of the axle of Figure 3 in the XY plane; FIG. 6 is a 3/4 view of a flexible axle according to a variant of the embodiment of the invention of FIGS. 3 to 5. The axle according to the invention shown in FIG. 3 comprises two longitudinal arms 10, a cross member 11 and a panhard bar 12. Each longitudinal arm comprises a front end 13 mounted to pivot on the body C of the vehicle about an axis 14 substantially parallel to the axis of rotation of the wheels, and a rear end 15 supporting a wheel (not shown ) rotating about an axis 16 of rotation. The ends of the crosspiece 11 are fixed on the longitudinal arms 10 at anchor points. The Panhard bar 12 is disposed in a horizontal plane close to the axis of rotation of the rear wheels, and extends between the crossbar and the wheels, one of its ends being fixed to a longitudinal arm, its other end being integral with the C body of the vehicle. FIG. 3 also shows an exhaust pipe 17 located under the flexible axle, between the axle and the ground clearance of the

véhicule. Ce tuyau s'étend suivant une direction longitudinale médiane du véhicule. Selon l'invention, au moins la partie centrale de la traverse est avancée suivant l'axe longitudinal X du véhicule vers l'avant du véhicule par rapport à l'axe des roues et décalée verticalement vers le haut par rapport aux points d'ancrage de la traverse aux bras longitudinaux, afin d'éviter toute interférence de la traverse avec d'autres éléments du véhicule lors des chocs et rebonds de l'essieu. A cet effet, conformément à un mode de réalisation de l'invention, la traverse 11 présente, au moins au niveau de sa partie centrale, un double cintrage, dirigé vers l'avant du véhicule et situé au dessus des bras longitudinaux. Ainsi, au moins la partie centrale de la traverse présente des surfaces cylindriques ou coniques selon des rayons plus ou moins grands dans deux plans distincts. Dans le mode de réalisation décrit en référence aux figures 3 à 5, le double cintrage de la traverse est situé uniquement au niveau de sa partie centrale. La traverse présente un premier cintrage dans le plan YZ, tel que représenté sur la figure 4, et un deuxième cintrage dans le plan XY, tel que représenté sur la figure 5. Ces cintrages sont suffisants pour éviter toute interférence de la traverse avec d'autres éléments du véhicule (tels que l'échappement) lors des chocs et rebonds de l'essieu. Les extrémités de la traverse solidaires des bras longitudinaux s'étendent sensiblement suivant un même axe parallèle à l'axe transversal Y du véhicule. Selon un autre mode de réalisation non représenté, le deuxième cintrage de la traverse (dans le plan XY) est remplacé par l'avancement des points d'ancrage de la traverse vers l'avant du véhicule suivant la direction longitudinale X par rapport à l'axe 16 des roues. Les points d'ancrage de la traverse sont de préférence situés à une distance de l'axe des roues comprise entre environ un tiers et: la moitié de la distance entre l'axe des roues 16 et l'axe de fixation 14 des bras longitudinaux sur la caisse du véhicule. De préférence, la traverse 11 présente une section fermée en forme de V ou d'étoile à trois branches. Il s'agit par exemple d'une section en V couché pointant vers l'arrière du véhicule. Bien entendu, la  vehicle. This pipe extends in a longitudinal longitudinal direction of the vehicle. According to the invention, at least the central portion of the cross member is advanced along the longitudinal axis X of the vehicle towards the front of the vehicle with respect to the axis of the wheels and offset vertically upwards with respect to the anchoring points from the crossbar to the longitudinal arms, to avoid interference of the cross member with other elements of the vehicle during shocks and rebounds of the axle. For this purpose, according to one embodiment of the invention, the cross member 11 has, at least at its central portion, a double bend, directed towards the front of the vehicle and located above the longitudinal arms. Thus, at least the central portion of the cross-member has cylindrical or conical surfaces in more or less large radii in two distinct planes. In the embodiment described with reference to Figures 3 to 5, the double bending of the crossbar is located only at its central portion. The crossbar has a first bend in the YZ plane, as shown in FIG. 4, and a second bend in the XY plane, as shown in FIG. 5. These bends are sufficient to avoid any interference of the cross member with the crossbar. other vehicle components (such as the exhaust) during shocks and rebounds of the axle. The ends of the crossbar secured to the longitudinal arms extend substantially along the same axis parallel to the transverse axis Y of the vehicle. According to another embodiment not shown, the second bending of the cross member (in the XY plane) is replaced by the advancement of the anchoring points of the cross member towards the front of the vehicle in the longitudinal direction X with respect to the 16 axis of the wheels. The anchoring points of the cross member are preferably located at a distance from the axis of the wheels of between approximately one-third and half the distance between the axis of the wheels 16 and the attachment axis 14 of the longitudinal arms. on the vehicle body. Preferably, the crosspiece 11 has a closed section V-shaped or three-pointed star. This is for example a recessed V-shaped section pointing towards the rear of the vehicle. Of course, the

traverse pourrait présenter d'autres formes de profil en fonction des propriétés recherchées. La traverse peut par exemple être d'abord cintrée par formage, puis sa section être mise en forme par hydroformage, emboutissage, ou toute technique appropriée. Dans une variante de l'invention représentée sur la figure 6, la traverse 11' est cintrée sur toute sa longueur, ses extrémités rejoignant donc les bras longitudinaux suivant un angle donné. Optionnellement, l'essieu selon l'invention peut comprendre un tirant 18 reliant transversalement les bras longitudinaux et situé à proximité de la traverse 11. Dans l'exemple représenté figure 3, ce tirant 18 est situé en arrière de la traverse, entre la traverse et la barre Panhard, mais il pourrait également être situé en avant de la traverse. Dans tous les cas, le tirant présente de préférence un faible diamètre de manière à présenter un encombrement limité et à ne pas entrer en interférence avec l'échappement. Dans les deux modes de réalisation, la traverse cintrée présente une symétrie par rapport à un axe longitudinal médian du véhicule. Les différents modes de réalisation et variantes décrits peuvent être combinés entre eux.  crosses could have other profile shapes depending on the desired properties. The cross member may for example be first bent by forming, then its section be shaped by hydroforming, stamping, or any suitable technique. In a variant of the invention shown in Figure 6, the cross 11 'is bent over its entire length, its ends thus joining the longitudinal arms at a given angle. Optionally, the axle according to the invention may comprise a tie rod 18 connecting transversely the longitudinal arms and located near the crosspiece 11. In the example shown in FIG. 3, this tie rod 18 is situated behind the cross member, between the cross member and the Panhard bar, but it could also be located in front of the transom. In all cases, the tie rod preferably has a small diameter so as to have a limited size and not to interfere with the exhaust. In both embodiments, the curved crosspiece has a symmetry with respect to a median longitudinal axis of the vehicle. The various embodiments and variants described can be combined with each other.

Claims (10)

REVENDICATIONS 1. Essieu souple arrière pour un véhicule automobile comportant un tuyau d'échappement (17) situé entre la garde au. sol du véhicule et l'essieu arrière et s'étendant le long de l'axe longitudinal médian du véhicule, l'essieu comprenant deux bras longitudinaux (10) supportant les roues et comportant un axe de fixation (14) à la caisse du véhicule, une traverse (1l, 11') reliant les bras longitudinaux au niveau de points d'ancrage, et une barre Panhard (12) dont une extrémité est solidaire d'un bras longitudinal et l'autre extrémité est destinée à être fixée à la caisse du véhicule, caractérisé en ce qu'au moins la partie centrale de la traverse (11, 11') est avancée suivant l'axe longitudinal (X) du véhicule vers l'avant du véhicule par rapport à l'axe des roues et décalée verticalement vers le haut par rapport aux points d'ancrage de la traverse aux bras longitudinaux, afin d'éviter toute interférence de la traverse avec d'autres éléments du véhicule lors des chocs et rebonds de l'essieu.  1. Rear flexible axle for a motor vehicle having an exhaust pipe (17) between the guard at. the vehicle ground and the rear axle and extending along the median longitudinal axis of the vehicle, the axle comprising two longitudinal arms (10) supporting the wheels and having a fixing pin (14) to the vehicle body , a crossbar (11, 11 ') connecting the longitudinal arms at anchor points, and a Panhard bar (12), one end of which is integral with a longitudinal arm and the other end is intended to be fixed to the vehicle body, characterized in that at least the central part of the crossmember (11, 11 ') is advanced along the longitudinal axis (X) of the vehicle towards the front of the vehicle relative to the axis of the wheels and offset vertically upwards from the anchor points of the cross member to the longitudinal arms, in order to avoid interference of the cross member with other elements of the vehicle during shocks and rebounds of the axle. 2. Essieu souple selon la revendication 1, (X, Y, Z) désignant les axes longitudinal, transversal et vertical du véhicule, caractérisé en ce que la traverse présente, au moins dans sa partie centrale, un cintrage dans le plan (YZ) du véhicule dirigé vers le haut, et en ce que les points d'ancrage de la traverse aux bras longitudinaux sont avancés suivant l'axe longitudinal (X) vers l'avant du véhicule par rapport à l'axe des roues.  2. flexible axle according to claim 1, (X, Y, Z) designating the longitudinal, transverse and vertical axes of the vehicle, characterized in that the crosspiece has, at least in its central part, a bending in the plane (YZ). of the vehicle directed upwards, and in that the anchoring points of the cross member to the longitudinal arms are advanced along the longitudinal axis (X) towards the front of the vehicle with respect to the axis of the wheels. 3. Essieu souple selon la revendication 2, caractérisé en ce que les points d'ancrage de la traverse aux bras longitudinaux sont situés à une distance de l'axe des roues comprise entre environ un tiers et la moitié de la distance entre l'axe des roues et l'axe de fixation des bras longitudinaux sur la caisse du véhicule.  3. Flexible axle according to claim 2, characterized in that the anchoring points of the cross member to the longitudinal arms are located at a distance from the axis of the wheels between about one third and half the distance between the axis. wheels and the axis of attachment of the longitudinal arms on the vehicle body. 4. Essieu souple selon la revendication 1, X, Y, Z désignant les axes longitudinal, transversal et vertical du véhicule, caractérisé en ce que la traverse présente, au moins dans sa partie centrale, un cintrage dans le plan (YZ) du véhicule et un cintrage dans le plan (XY) du véhicule, la partie cintrée s'étendant vers l'avant du véhicule et au dessus des bras longitudinaux.  4. Flexible axle according to claim 1, X, Y, Z denoting the longitudinal, transverse and vertical axes of the vehicle, characterized in that the cross member has, at least in its central part, a bending in the plane (YZ) of the vehicle and a bend in the plane (XY) of the vehicle, the bent portion extending towards the front of the vehicle and above the longitudinal arms. 5. Essieu souple arrière selon l'une des revendications 1 à 4, caractérisé en ce que la traverse (1 l') est cintrée sur toute sa longueur.  5. Rear flexible axle according to one of claims 1 to 4, characterized in that the cross member (1 ') is bent over its entire length. 6. Essieu souple arrière selon l'une des revendications 1 à 5, caractérisé en ce que la traverse présente un profil fermé.  6. Rear flexible axle according to one of claims 1 to 5, characterized in that the cross member has a closed profile. 7. Essieu souple arrière selon l'une des revendications 1 à 6, caractérisé en ce qu'il comporte un tirant (18) dont chaque extrémité est fixée à un bras longitudinal (10), le tirant s'étendant transversalement aux bras, à proximité de la traverse.  7. Rear flexible axle according to one of claims 1 to 6, characterized in that it comprises a tie rod (18) whose each end is fixed to a longitudinal arm (10), the tie extending transversely to the arms, to near the crossing. 8. Essieu souple arrière selon la revendication 7, caractérisé en ce que le tirant est situé en avant de la traverse.  8. Rear flexible axle according to claim 7, characterized in that the tie is located in front of the cross. 9. Essieu souple arrière selon la revendication 7, caractérisé en ce que le tirant est situé en arrière de la traverse.  9. rear flexible axle according to claim 7, characterized in that the tie rod is located behind the cross member. 10. Véhicule automobile caractérisé en ce qu'il comporte un essieu souple arrière selon l'une des revendications précédentes, et en ce qu'il comporte un tuyau d'échappement situé entre sa garde au sol et l'essieu arrière, et s'étendant sensiblement au centre du véhicule suivant son axe longitudinal.  10. A motor vehicle characterized in that it comprises a rear flexible axle according to one of the preceding claims, and in that it comprises an exhaust pipe located between its ground clearance and the rear axle, and s' extending substantially to the center of the vehicle along its longitudinal axis.
FR0602416A 2006-03-20 2006-03-20 Rear flexible axle for motor vehicle, has crosspiece with central part separated vertically towards top with respect to anchoring points of crosspiece, where crosspiece connects longitudinal arms at level of points Pending FR2898543A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0602416A FR2898543A1 (en) 2006-03-20 2006-03-20 Rear flexible axle for motor vehicle, has crosspiece with central part separated vertically towards top with respect to anchoring points of crosspiece, where crosspiece connects longitudinal arms at level of points

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0602416A FR2898543A1 (en) 2006-03-20 2006-03-20 Rear flexible axle for motor vehicle, has crosspiece with central part separated vertically towards top with respect to anchoring points of crosspiece, where crosspiece connects longitudinal arms at level of points

Publications (1)

Publication Number Publication Date
FR2898543A1 true FR2898543A1 (en) 2007-09-21

Family

ID=36603356

Family Applications (1)

Application Number Title Priority Date Filing Date
FR0602416A Pending FR2898543A1 (en) 2006-03-20 2006-03-20 Rear flexible axle for motor vehicle, has crosspiece with central part separated vertically towards top with respect to anchoring points of crosspiece, where crosspiece connects longitudinal arms at level of points

Country Status (1)

Country Link
FR (1) FR2898543A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2926749A3 (en) * 2008-01-24 2009-07-31 Renault Sas Axle crosspiece for motor vehicle, has truncated opening provided in its upper surface for receiving exhaust passage or fuel pipe of motor vehicle, where opening is obtained by pressing or folding pierced sheet
WO2010004370A1 (en) * 2008-07-08 2010-01-14 Sistemi Sospensioni S.P.A. Cross-member for a rear twist-beam axle suspension for a motor vechicle and method for its production
FR2949999A1 (en) * 2009-09-11 2011-03-18 Peugeot Citroen Automobiles Sa Semi-deformable axle i.e. rear axle, for motor vehicle, has cross-piece with torsion center shifted toward vehicle exterior at predetermined distance to compensate stabilizing bar action during displacement of suspension
US9174505B2 (en) 2008-11-12 2015-11-03 Sistemi Sospensioni S.P.A. Vehicle independent suspension

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5820505A (en) * 1981-07-27 1983-02-07 Mazda Motor Corp Rear wheel suspension for automobile
FR2545422A1 (en) * 1983-05-06 1984-11-09 Matra Automobile Improvements made to vehicle suspensions, and cross member for such suspensions
EP0389363A1 (en) * 1989-03-22 1990-09-26 Automobiles Peugeot Motor vehicle rear wheel set
EP0458665A1 (en) * 1990-05-17 1991-11-27 Automobiles Peugeot Automotive vehicle rear-axle assembly
EP0733501A2 (en) * 1995-03-24 1996-09-25 Toyota Jidosha Kabushiki Kaisha Twist beam type suspension having a rigid twist beam
JPH09193640A (en) * 1996-01-23 1997-07-29 Daihatsu Motor Co Ltd Suspension
EP0947362A2 (en) * 1998-03-30 1999-10-06 Mazda Motor Corporation Rear suspension apparatus for motor vehicle
JP2000177349A (en) * 1998-12-11 2000-06-27 Nissan Motor Co Ltd Rear suspension device
JP2001113925A (en) * 1999-10-21 2001-04-24 Honda Motor Co Ltd Torsion beam suspension
EP1297977A2 (en) * 2001-09-28 2003-04-02 FIAT AUTO S.p.A. Axle having a torsionally deformable cross member for the rear suspension of a motor vehicle, and method for production of such axle
FR2846914A1 (en) * 2002-11-08 2004-05-14 Auto Chassis Int Reinforcement device for anti-cant bar mounted on flexible axle, has reinforcement placed between longitudinal arm and end of bar, where arm is welded at ends of reinforcement and bars are welded in center of reinforcement
FR2878786A1 (en) * 2004-12-08 2006-06-09 Auto Chassis Internat Snc Snc FLEXIBLE AXLE COMPRISING A TROPEZOIDAL SECTION RAIL, TRAVERSE, VEHICLE AND METHOD FOR MANUFACTURING THE SAME
EP1674307A1 (en) * 2004-12-21 2006-06-28 Toyota Jidosha Kabushiki Kaisha Axle suspension apparatus

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5820505A (en) * 1981-07-27 1983-02-07 Mazda Motor Corp Rear wheel suspension for automobile
FR2545422A1 (en) * 1983-05-06 1984-11-09 Matra Automobile Improvements made to vehicle suspensions, and cross member for such suspensions
EP0389363A1 (en) * 1989-03-22 1990-09-26 Automobiles Peugeot Motor vehicle rear wheel set
EP0458665A1 (en) * 1990-05-17 1991-11-27 Automobiles Peugeot Automotive vehicle rear-axle assembly
EP0733501A2 (en) * 1995-03-24 1996-09-25 Toyota Jidosha Kabushiki Kaisha Twist beam type suspension having a rigid twist beam
JPH09193640A (en) * 1996-01-23 1997-07-29 Daihatsu Motor Co Ltd Suspension
EP0947362A2 (en) * 1998-03-30 1999-10-06 Mazda Motor Corporation Rear suspension apparatus for motor vehicle
JP2000177349A (en) * 1998-12-11 2000-06-27 Nissan Motor Co Ltd Rear suspension device
JP2001113925A (en) * 1999-10-21 2001-04-24 Honda Motor Co Ltd Torsion beam suspension
EP1297977A2 (en) * 2001-09-28 2003-04-02 FIAT AUTO S.p.A. Axle having a torsionally deformable cross member for the rear suspension of a motor vehicle, and method for production of such axle
FR2846914A1 (en) * 2002-11-08 2004-05-14 Auto Chassis Int Reinforcement device for anti-cant bar mounted on flexible axle, has reinforcement placed between longitudinal arm and end of bar, where arm is welded at ends of reinforcement and bars are welded in center of reinforcement
FR2878786A1 (en) * 2004-12-08 2006-06-09 Auto Chassis Internat Snc Snc FLEXIBLE AXLE COMPRISING A TROPEZOIDAL SECTION RAIL, TRAVERSE, VEHICLE AND METHOD FOR MANUFACTURING THE SAME
EP1674307A1 (en) * 2004-12-21 2006-06-28 Toyota Jidosha Kabushiki Kaisha Axle suspension apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LANDREAU T: "L'AVENIR DES TRAINS AR: ESSIEU SOUPLE OU MULTI-BRAS?", INGENIEURS DE L'AUTOMOBILE, EDITIONS VB, GARCHES, FR, no. 733, November 1999 (1999-11-01), pages 78 - 81, XP000893851, ISSN: 0020-1200 *
SETTMEIER D ET AL: "A NEW CONCEPT FOR INDEPENDENT WHEEL REAR AXLE WITH TWISTED TUBULAR CROSSBAR FITTED ON OUR PSA/FIAT MONOSPACE LA NOUVELLE CONCEPTION D'ESSIEU ARRIERE TUBULAIRE, A ROUES INDEPENDANTES, APPLIQUEE AU MONOSPACE PSA/FIAT", INGENIEURS DE L'AUTOMOBILE, EDITIONS VB, GARCHES, FR, no. 699, 1 August 1995 (1995-08-01), pages 71 - 74, XP000525390, ISSN: 0020-1200 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2926749A3 (en) * 2008-01-24 2009-07-31 Renault Sas Axle crosspiece for motor vehicle, has truncated opening provided in its upper surface for receiving exhaust passage or fuel pipe of motor vehicle, where opening is obtained by pressing or folding pierced sheet
WO2010004370A1 (en) * 2008-07-08 2010-01-14 Sistemi Sospensioni S.P.A. Cross-member for a rear twist-beam axle suspension for a motor vechicle and method for its production
US9174505B2 (en) 2008-11-12 2015-11-03 Sistemi Sospensioni S.P.A. Vehicle independent suspension
FR2949999A1 (en) * 2009-09-11 2011-03-18 Peugeot Citroen Automobiles Sa Semi-deformable axle i.e. rear axle, for motor vehicle, has cross-piece with torsion center shifted toward vehicle exterior at predetermined distance to compensate stabilizing bar action during displacement of suspension

Similar Documents

Publication Publication Date Title
EP1827880B1 (en) Flexible axle comprising a cross-member with trapezoid cross-section, corresponding cross-member, vehicle and manufacturing method
FR2536345A1 (en) SUSPENSION WITH SUPERIMPOSED TRIANGLES AND VARIABLE HUNTING ANGLE FOR VEHICLES
WO2006067087A1 (en) Suspended axle for a vehicle
FR3071813B1 (en) ATTELABLE ROAD MOTOR VEHICLE HAS SUSPENSION AND COMPACT DIRECTION
FR2898543A1 (en) Rear flexible axle for motor vehicle, has crosspiece with central part separated vertically towards top with respect to anchoring points of crosspiece, where crosspiece connects longitudinal arms at level of points
WO2015092174A1 (en) Suspension assembly for a motor vehicle, connecting ball joint for the assembly and corresponding installation method
EP2790937A1 (en) Motor vehicle anti-roll bar
EP3119665B1 (en) Rear structure of a motor vehicle
EP0743205B1 (en) Semi-rigid axle for a vehicle
FR2941405A1 (en) Anti-roll bar for use on train of wheels of motor vehicle, has torsion part whose each end is fixed to lever at point located between bearing of lever and mobile end of lever, where mobile end is subjected to suspension travel of wheel
EP3362305B1 (en) Suspension arm having different thicknesses
FR2855143A1 (en) Rear wheel shaft for motor vehicle, has actuator to connect cross bars to pivot right and left longitudinally oscillating arms in direction with respect to axis that is vertical to front end of arm and body of vehicle
FR2909931A1 (en) Motor vehicle e.g. car, has sliding bush displaced with respect to semi-bars of stabilizer bar for varying length of each semi-bar suitable to transmit torsion stress, such that stiffness of stabilizer bar varies
FR2730955A1 (en) REAR TRAIN FOR MOTOR VEHICLE
FR2757453A1 (en) INDIVIDUAL WHEEL SUSPENSION HAVING A WHEEL SUPPORT SUPPORTED ON AN OBLIQUE ARM VIA A COUPLING BAR
FR2788473A1 (en) Automobile rear axle with separate helicoidal spring and absorber with support connecting cross arms via flexible couplings
FR2908082A1 (en) Rear axle for motor vehicle, has crosspiece connecting longitudinal arms and formed of two plates separated on their length, and Panhard stabilizing rod articulated at end on one of arms and at another end on body shell of vehicle
EP0392891B1 (en) Vehicle suspension system
FR2540453A1 (en) ARTICULATED BUS COMPRISING AT LEAST ONE FOLLOWING ELEMENT WITH A CONTROLLED-DIRECTION AXLE
EP4347282A1 (en) Rear axle for a motor vehicle, of the type with two longitudinal trailing arms having improved elastic behaviour
FR2810927A1 (en) Rear wheel suspension for motor vehicle has leaf spring extending around inner radius of wheel
FR3123592A1 (en) Device for attaching a trailer to a tractor vehicle provided with an articulated connecting structure
FR3100528A1 (en) TILT CONTROL SYSTEM OF A PENDULUM VEHICLE EQUIPPED WITH A MOTORIZATION AND CONNECTING RODS
EP2248712A1 (en) Bar device under the body shell of a vehicle intended for increasing the rigidity thereof, bar for implementing such a device and vehicle provided with such a device
FR2793734A1 (en) Rear axle for car comprises support with its lower part attached to rear end of arm, median part attached to wheel, and upper part attached to suspension rod