EP2419285A1 - Front end assembly for a motor vehicle comprising a suspension with a transverse blade - Google Patents

Front end assembly for a motor vehicle comprising a suspension with a transverse blade

Info

Publication number
EP2419285A1
EP2419285A1 EP10725365A EP10725365A EP2419285A1 EP 2419285 A1 EP2419285 A1 EP 2419285A1 EP 10725365 A EP10725365 A EP 10725365A EP 10725365 A EP10725365 A EP 10725365A EP 2419285 A1 EP2419285 A1 EP 2419285A1
Authority
EP
European Patent Office
Prior art keywords
blade
support
vehicle
front axle
axle according
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.)
Withdrawn
Application number
EP10725365A
Other languages
German (de)
French (fr)
Inventor
Arnaud Lizot
Bernard Niclot
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen 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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2419285A1 publication Critical patent/EP2419285A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/001—Suspension arms, e.g. constructional features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/08—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only arranged substantially transverse to the longitudinal axis of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/32—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds
    • B60G11/34—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs
    • B60G11/36—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs and also helical, spiral or coil springs
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/10—Independent suspensions
    • B60G2200/14—Independent suspensions with lateral arms
    • B60G2200/142—Independent suspensions with lateral arms with a single lateral arm, e.g. MacPherson type
    • B60G2200/1422—Independent suspensions with lateral arms with a single lateral arm, e.g. MacPherson type the lateral arm being resilient
    • 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
    • B60G2202/11—Leaf spring
    • B60G2202/114—Leaf spring transversally arranged
    • 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
    • B60G2206/70—Materials used in suspensions
    • B60G2206/71—Light weight materials
    • B60G2206/7101—Fiber-reinforced plastics [FRP]

Definitions

  • the present invention relates to a front axle for a motor vehicle, comprising a transverse blade suspension, also called integrated suspension, and a motor vehicle equipped with such a train.
  • the motor vehicles comprise a front axle generally director, linked to the vehicle body, which supports the hubs of the wheels by providing both a guiding of the wheels to allow movement of the suspensions and, secondly, the rotation of the wheels when of a robbery.
  • the Mac-Pherson (PMP) pseudo-front gear is the architecture that offers the best price / performance compromise. This is why this technology is very widespread among general manufacturers.
  • This architecture includes an element called strut which is composed in the main of a damper and a coil spring supported on the body thereof.
  • the strut provides control of the displacement of the wheel in the vertical direction relative to the ground plane on which the vehicle is moving, according to a determined force / speed law.
  • the triangle is fixed on a lower part of the vehicle body called cradle, by means of two articulations which are aligned in a substantially longitudinal direction, parallel to the direction longitudinal of the vehicle. These two joints provide pivoting of the triangle during the vertical movement of the wheel.
  • the front axle also includes an anti-roll bar connecting the two wheels of the train to compensate, or resume, the forces exerted independently on each wheel and which result in a force resulting from twisting of the train.
  • a steering rack and its rod connect the steering control (the steering wheel) to the wheel pivot.
  • a first architecture is described in document FR 2 503 054 A1. This document completely describes the concept of a transverse blade PMP train. The blade is fixed to the body at two points ensuring the spring function of an anti-roll bar.
  • a second architecture which is an evolution of the first, is described in WO 8301758 A1.
  • This second architecture improves the transverse blade concept by producing a composite material blade based on unidirectional glass fibers and epoxy resin with an excess thickness at the ends to compensate for the transverse and longitudinal forces to which the wheels of the front axle being subjected are subjected. braking and / or steering wheel.
  • the transverse blade is fixed to the vehicle body at four points, via vertical rods.
  • the blade is shaped Omega to bypass the powertrain.
  • the present invention proposes a new front axle architecture comprising a suspension with a transverse blade, in which the blade is preferably made of composite material, and in which the function of recovery of the longitudinal forces due to braking, is offset from the blade.
  • the blade is preferably made of composite material, and in which the function of recovery of the longitudinal forces due to braking, is offset from the blade.
  • This advantage is added to those of weight gain and compactness compared to a conventional PMP train.
  • the invention relates to a vehicle front train, particularly a motor vehicle, supporting each of the steering wheels of the vehicle via a wheel pivot support, said train comprising a suspension comprising a transverse blade composite material, fixed to the vehicle body, and each end portion is integrally connected to the wheel pivot support, characterized in that each end of the transverse blade is suspended under the vehicle body by a support sandwiching the end of the blade and in that a means of recovery of the longitudinal forces during braking is disposed between the support of the blade and the wheel pivot support; the end of the blade, the support and the effort recovery means defining substantially and respectively the three sides of a suspension triangle.
  • the support is attached to the blade and extends transversely to it in a direction substantially parallel to the longitudinal axis of the vehicle; first and second fastening means being respectively disposed at both ends of the carrier via first and second resilient hinges for securing the carrier to the vehicle body; the first joint being adjacent to the transverse blade
  • the means for taking up the longitudinal forces during braking is a rectilinear link, the ends of which are respectively fixed on the pivot support via an elastic articulation, and on the second articulation of the support.
  • the means for taking up the longitudinal forces during braking is the straight bent portion of an anti-roll bar extending parallel to the transverse blade; the end part of the straight bent part of the anti-roll bar being fixed on the wheel pivot support by an elastic fixing means and the end part of the right part of the anti-roll bar, not bent, being fixed on the support, near the second articulation, by an elastic pivot connection.
  • the support of the blade is also used as support for a steering rack; fastening means of the rack on the support being disposed in the vicinity of the second articulation of the support.
  • each support is disposed substantially between the end portion of the blade and the longitudinal axis of the vehicle.
  • the longitudinal axis of the blade is substantially centered on the axis of the wheels.
  • the invention also relates to a front axle as described above.
  • FIG. 1 and 2 respectively show schematic top and side views of a half-front train according to the invention
  • FIG. 3 illustrates a schematic view of the rear of a half-front axle according to the invention
  • FIG. 4 illustrates, in top view, a variant of a half-front axle according to the invention.
  • the different figures represent a half-front right train of a vehicle referenced in space by the reference XY Z.
  • the front axle being symmetrical with respect to the longitudinal axis X 'of the vehicle, only the right front half-axle is shown and described.
  • the vehicle is symbolized by its longitudinal axis X 'and its vertical axis Z' perpendicular to the longitudinal axis X 'and the ground plane S on which the vehicle is moving.
  • the front axle according to the invention comprises a transverse blade 1 preferably made of composite material, and extending transversely with respect to the vehicle in the Y direction.
  • the longitudinal axis of the blade 1 is substantially centered on the axis of the wheels 11.
  • the end portion 2 of the blade 1 is connected to the wheel pivot 3 via a pivot support 4 which integrally sandwiches the end portion 2 of the blade 1.
  • the blade 1 is suspended under the body 5 of the vehicle (FIG. 2) by means of a support 6, disposed substantially between the extreme part
  • the support 6 is for example constituted by two rectilinear bars of rectangular section, assembled one on the other, one of which is flat and the other is folded so as to locally grip the blade 1 to sandwich it.
  • the support 6 is fixed to the body 5 of the vehicle by first and second fixing means 7 and 8, for example screws, which are respectively disposed at both ends of the support 6.
  • First and second elastic joints 9 and 10, forming spacers and through which pass the attachment means, are interposed between the support 6 and the body 5.
  • the fastening means 7 and 8 and the joints 9 and 10 are aligned in the longitudinal direction X and the first fixing means 7 and the second articulation 9 are adjacent to the transverse blade 1.
  • the blade 1 is deformed according to the principle of a beam working in flexion bearing under the body 5 via the two joints 9 and 10.
  • the spring function is then provided by the blade 1 for a symmetrical vertical travel of the wheels 11 relative to the longitudinal axis X '(pumping case) .
  • the blade 1 connecting the two wheels 11 of the front axle takes a shape of "S" in the Y direction and then provides the anti-roll function.
  • the function of recovery of the longitudinal forces under braking (efforts opposing the displacement of the vehicle along the X axis) is provided by a straight rod 12 which is fixed between the end portion 2 of the blade 1, on the pivot support 4, and the support 6 of the blade 1 (force opposing the movement of the vehicle along the X axis).
  • the ends of the rod 12 are respectively fixed on the pivot support 4 via an elastic articulation 13, and on the second articulation 10 of the support 6.
  • the steering rack 14 is fixed between and on the two blade supports 1.
  • the free end of the steering rod 15 is coupled by a pivot connection known per se, to the wheel pivot 3.
  • Fastening means 16 of the rack 14 on the support 6 are arranged in the vicinity of the second hinge 10.
  • the blade 1 "takes up” the transverse forces imposed on the base of the wheel 11 during turns. It thus ensures a good rigidity of the wheel plane 11 facing the transverse forces symbolized by the arrow F; the rod 12 "taking up” the longitudinal forces in case of braking.
  • the blade 1 works in flexion in the vertical direction Z during deflections of the wheel 11 and in traction / compression during turns.
  • the blade 1 does not work in flexion in the longitudinal direction during braking.
  • the dimension of the blade 1 can therefore be reduced, which makes it possible to reduce the cost thereof, a decrease which is all the greater in the case of a blade 1 made of composite material.
  • the overall cost of the architecture is then reduced compared to previous solutions.
  • the blade 1 is preferably made of fiberglass / epoxy resin composite material in order to allow a vertical clearance of the sufficient wheel 11 without damaging the material.
  • the orientation of the fibers can be essentially transverse in order to increase the characteristics in this direction.
  • FIG. 4 illustrates an alternative embodiment of a front axle according to the invention in which the means for taking up the longitudinal forces during braking, which were constituted by the rods 12, are replaced by an anti-roll bar 17.
  • the anti-roll bar 17 which, in this variant, "resumes" the longitudinal forces.
  • the right part 18 of the anti-roll bar 17 extends parallel to the transverse blade 1.
  • the anti-roll bar 17 terminates at each of its ends by a bent right portion 19 extending substantially at 45 ° towards the front of the vehicle.
  • the end portion 20 of the right bent portion 19 is fixed on the pivot support 4 by an elastic fastening means 21, for example a rubber hinge, and the right portion 18 of the anti-roll bar 17, located just before the part bent 19, is fixed on the support 6, near the second joint 10, by an elastic pivot connection 22, for example, a bearing made of rubber material.
  • an elastic fastening means 21 for example a rubber hinge
  • the right portion 18 of the anti-roll bar 17, located just before the part bent 19 is fixed on the support 6, near the second joint 10 by an elastic pivot connection 22, for example, a bearing made of rubber material.
  • the end BS of the blade 1, the support 6 and the effort recovery means 12 or 17 define substantially and respectively the three sides of a suspension triangle.

Abstract

The invention relates to a front end assembly for a motor vehicle, in particular for motor vehicle, supporting each of the steering wheels (11) of the vehicle by means of a pivoting wheel holder (4), said front end assembly comprising a suspension comprising a transverse blade (1) made of composite material, attached to the body shell (5) of the vehicle and each end portion (2) of which is rigidly connected to the pivoting wheel holder (4), characterized in that each end (10) of the transverse blade (1) is suspended under the body shell (5) of the vehicle by a holder (6) sandwiching the end (10) of the blade (1), and in that a means (12; 17) for taking-up the longitudinal stresses to the brakes is arranged between the holder (6) of the blade (1) and the pivoting wheel holder (4); the end (10) of the blade (1), the holder (6) and the force take-up means (12; 17) substantially and respectively defining the three sides of a suspension triangle.

Description

TRAIN AVANT POUR VEHICULE AUTOMOBILE COMPORTANT UNE SUSPENSION A LAME TRANSVERSALE FRONT TRAIN FOR A MOTOR VEHICLE HAVING A TRANSVERSE BLADE SUSPENSION
La présente invention concerne un train avant pour véhicule automobile, comportant une suspension à lame transversale, appelée également suspension intégrée, ainsi qu'un véhicule automobile équipé d'un tel train.The present invention relates to a front axle for a motor vehicle, comprising a transverse blade suspension, also called integrated suspension, and a motor vehicle equipped with such a train.
Les véhicules automobiles comportent un train avant généralement directeur, lié à la caisse du véhicule, qui supporte les moyeux des roues en assurant à la fois un guidage des roues pour permettre un débattement des suspensions et, d'autre part, la rotation des roues lors d'un braquage.The motor vehicles comprise a front axle generally director, linked to the vehicle body, which supports the hubs of the wheels by providing both a guiding of the wheels to allow movement of the suspensions and, secondly, the rotation of the wheels when of a robbery.
Dans la famille des architectures de trains avant, le train avant de type Pseudo Mac-Pherson (PMP) est l'architecture qui présente le meilleur compromis prix/prestation. C'est pourquoi cette technologie est très répandue chez les constructeurs généralistes. Cette architecture comporte un élément appelé jambe de force qui est composé au principal d'un amortisseur et d'un ressort hélicoïdal appuyé sur le corps de celui-ci.In the family of front train architectures, the Mac-Pherson (PMP) pseudo-front gear is the architecture that offers the best price / performance compromise. This is why this technology is very widespread among general manufacturers. This architecture includes an element called strut which is composed in the main of a damper and a coil spring supported on the body thereof.
La jambe de force assure le contrôle du déplacement de la roue dans la direction verticale par rapport au plan du sol sur lequel évolue le véhicule, en fonction d'une loi effort/vitesse déterminée.The strut provides control of the displacement of the wheel in the vertical direction relative to the ground plane on which the vehicle is moving, according to a determined force / speed law.
Elle est fixée à la caisse du véhicule dans sa partie supérieure par une articulation permettant une rotation dans une direction essentiellement verticale et, dans sa partie inférieure, à un organe appelé pivot de roue sur lequel est fixée la roue par l'intermédiaire des roulements de roues. Le pivot est lui-même relié à la caisse du véhicule par l'intermédiaire d'une pièce en tôle emboutie, appelée triangle inférieur.It is fixed to the body of the vehicle in its upper part by a joint allowing rotation in a substantially vertical direction and, in its lower part, to a member called wheel pivot on which is fixed the wheel through the bearings of wheels. The pivot is itself connected to the vehicle body through a stamped sheet metal part, called lower triangle.
Il est fixé sur le triangle par une rotule afin de permettre la rotation de la roue avec son pivot lors du braquage.It is fixed on the triangle by a ball joint to allow rotation of the wheel with its pivot during steering.
Le triangle est fixé sur une partie basse de la caisse du véhicule appelée berceau, par l'intermédiaire de deux articulations qui son alignées dans une direction essentiellement longitudinale, parallèle à la direction longitudinale du véhicule. Ces deux articulations assurent le pivotement du triangle lors du débattement vertical de la roue.The triangle is fixed on a lower part of the vehicle body called cradle, by means of two articulations which are aligned in a substantially longitudinal direction, parallel to the direction longitudinal of the vehicle. These two joints provide pivoting of the triangle during the vertical movement of the wheel.
Le train avant comporte également une barre anti-dévers reliant les deux roues du train pour compenser, ou reprendre, les efforts qui s'exercent indépendamment sur chacune des roues et qui se traduisent par un effort résultant de torsion au niveau du train.The front axle also includes an anti-roll bar connecting the two wheels of the train to compensate, or resume, the forces exerted independently on each wheel and which result in a force resulting from twisting of the train.
Enfin, pour piloter le braquage de la roue, une crémaillère de direction et sa biellette relient la commande de direction (le volant) au pivot de roue.Finally, to steer the steering of the wheel, a steering rack and its rod connect the steering control (the steering wheel) to the wheel pivot.
Des évolutions de cette architecture on été développées. Elles permettent un gain de poids, et de compacité. Elles proposent le remplacement des triangles, du berceau, des ressorts et de la barre anti- dévers par une lame transversale.Evolutions of this architecture have been developed. They allow weight gain and compactness. They propose the replacement of the triangles, the cradle, the springs and the anti-roll bar by a transverse blade.
Une première architecture est décrite dans le document FR 2 503 054 A1. Ce document décrit complètement le concept d'un train PMP à lame transversale. La lame est fixée à la caisse en deux points assurant la fonction ressort d'une barre anti-dévers.A first architecture is described in document FR 2 503 054 A1. This document completely describes the concept of a transverse blade PMP train. The blade is fixed to the body at two points ensuring the spring function of an anti-roll bar.
Une deuxième architecture, qui est une évolution de la première, est décrite dans le document WO 8301758 A1. Cette deuxième architecture améliore le concept de lame transversale en réalisant une lame en matériau composite à base de fibres de verre unidirectionnelles et de résine époxyde avec une surépaisseur aux extrémités pour compenser les efforts transversaux et longitudinaux auxquels sont soumises les roues du train avant en cours de freinage et/ou de braquage des roues.A second architecture, which is an evolution of the first, is described in WO 8301758 A1. This second architecture improves the transverse blade concept by producing a composite material blade based on unidirectional glass fibers and epoxy resin with an excess thickness at the ends to compensate for the transverse and longitudinal forces to which the wheels of the front axle being subjected are subjected. braking and / or steering wheel.
Selon une troisième architecture, décrite dans le document EP 436 407 A1 , la lame transversale est fixée à la caisse du véhicule en quatre points, par l'intermédiaire de biellettes verticales. La lame est en forme d'Oméga pour contourner le groupe motopropulseur.According to a third architecture, described in EP 436 407 A1, the transverse blade is fixed to the vehicle body at four points, via vertical rods. The blade is shaped Omega to bypass the powertrain.
La présente invention propose une nouvelle architecture de train avant comportant une suspension à lame transversale, dans laquelle la lame est réalisée de préférence en matériau composite, et dans laquelle la fonction de reprise des efforts longitudinaux dus au freinage, est déportée de la lame. Ainsi, grâce à la présente invention, il est possible de diminuer significativement le volume de la lame composite et donc son prix. Compte tenu du prix élevé du matériau utilisé pour la réalisation de la lame, l'impact de la réduction de coût sur la lame rejaillit sur le prix global de l'architecture du train avant.The present invention proposes a new front axle architecture comprising a suspension with a transverse blade, in which the blade is preferably made of composite material, and in which the function of recovery of the longitudinal forces due to braking, is offset from the blade. Thus, thanks to the present invention, it is possible to significantly reduce the volume of the composite blade and therefore its price. Given the high price of the material used for the realization of the blade, the impact of the cost reduction on the blade reflects on the overall price of the architecture of the front axle.
Cet avantage se rajoute à ceux de gain de poids et de compacité par rapport à un train PMP classique.This advantage is added to those of weight gain and compactness compared to a conventional PMP train.
A cet effet, l'invention concerne un train avant de véhicule, notamment de véhicule automobile, supportant chacune des roues directrices du véhicule par l'intermédiaire d'un support de pivot de roue, le dit train comportant une suspension comportant une lame transversale en matériau composite, fixée à la caisse du véhicule, et dont chaque partie extrême est reliée solidairement au support de pivot de roue, caractérisé en ce que chaque extrémité de la lame transversale est suspendue sous la caisse du véhicule par un support prenant en sandwich l'extrémité de la lame et, en ce qu'un moyen de reprise des efforts longitudinaux au freinage est disposé entre le support de la lame et le support de pivot de roue ; l'extrémité de la lame, le support et le moyen de reprise d'efforts définissant sensiblement et respectivement les trois côtés d'un triangle de suspension. Selon une caractéristique, le support est rapporté sur la lame et s'étend transversalement par rapport à elle selon une direction sensiblement parallèle à l'axe longitudinal du véhicule ; des premier et second moyens de fixation étant disposés respectivement aux deux extrémités du support par l'intermédiaire de première et seconde articulations élastiques pour fixer le support à la caisse du véhicule ; la première articulation étant adjacente à la lame transversaleFor this purpose, the invention relates to a vehicle front train, particularly a motor vehicle, supporting each of the steering wheels of the vehicle via a wheel pivot support, said train comprising a suspension comprising a transverse blade composite material, fixed to the vehicle body, and each end portion is integrally connected to the wheel pivot support, characterized in that each end of the transverse blade is suspended under the vehicle body by a support sandwiching the end of the blade and in that a means of recovery of the longitudinal forces during braking is disposed between the support of the blade and the wheel pivot support; the end of the blade, the support and the effort recovery means defining substantially and respectively the three sides of a suspension triangle. According to one characteristic, the support is attached to the blade and extends transversely to it in a direction substantially parallel to the longitudinal axis of the vehicle; first and second fastening means being respectively disposed at both ends of the carrier via first and second resilient hinges for securing the carrier to the vehicle body; the first joint being adjacent to the transverse blade
Selon une autre caractéristique, le moyen de reprise des efforts longitudinaux au freinage est une biellette rectiligne dont les extrémités sont respectivement fixées sur le support pivot via une articulation élastique, et sur la seconde articulation du support. Selon une variante, le moyen de reprise des efforts longitudinaux au freinage est la partie coudée rectiligne d'une barre anti-dévers s'étendant parallèlement à la lame transversale ; la partie extrême de la partie coudée rectiligne de la barre anti-dévers étant fixée sur le support de pivot de roue par un moyen de fixation élastique et la partie extrême de la partie droite de la barre anti-dévers, non coudée, étant fixée sur le support, à proximité de la seconde articulation, par une liaison pivot élastique.According to another characteristic, the means for taking up the longitudinal forces during braking is a rectilinear link, the ends of which are respectively fixed on the pivot support via an elastic articulation, and on the second articulation of the support. According to one variant, the means for taking up the longitudinal forces during braking is the straight bent portion of an anti-roll bar extending parallel to the transverse blade; the end part of the straight bent part of the anti-roll bar being fixed on the wheel pivot support by an elastic fixing means and the end part of the right part of the anti-roll bar, not bent, being fixed on the support, near the second articulation, by an elastic pivot connection.
Selon une autre caractéristique, le support de la lame est également utilisé comme support d'une crémaillère de direction ; des moyens de fixation de la crémaillère sur le support étant disposés au voisinage de la seconde articulation du support.According to another characteristic, the support of the blade is also used as support for a steering rack; fastening means of the rack on the support being disposed in the vicinity of the second articulation of the support.
Selon une autre caractéristique, chaque support est disposé sensiblement entre la partie extrême de la lame et l'axe longitudinal du véhicule. Selon une autre caractéristique, l'axe longitudinal de la lame est sensiblement centré sur l'axe des roues.According to another characteristic, each support is disposed substantially between the end portion of the blade and the longitudinal axis of the vehicle. According to another characteristic, the longitudinal axis of the blade is substantially centered on the axis of the wheels.
L'invention a également pour objet, un train avant tel que décrit ci- dessus.The invention also relates to a front axle as described above.
L'invention sera mieux comprise et d'autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description faite ci- après, donnée à titre d'exemple, non limitatif, en référence aux dessins annexés dans lesquels :The invention will be better understood and other features and advantages will emerge more clearly on reading the description given below, given by way of nonlimiting example, with reference to the appended drawings in which:
- les figures 1 et 2 illustrent respectivement des vues schématiques de dessus et de côté, d'un demi-train avant selon l'invention ; - la figure 3 illustre une vue schématique de l'arrière d'un demi-train avant selon l'invention ; et- Figures 1 and 2 respectively show schematic top and side views of a half-front train according to the invention; - Figure 3 illustrates a schematic view of the rear of a half-front axle according to the invention; and
- la figure 4 illustre, en vue de dessus, une variante d'un demi-train avant selon l'invention.- Figure 4 illustrates, in top view, a variant of a half-front axle according to the invention.
Les différentes figures représentent un demi-train avant droit d'un véhicule référencé dans l'espace par le référentiel X Y Z. Le train avant étant symétrique par rapport à l'axe longitudinal X' du véhicule, seul le demi-train avant droit est représenté et décrit.The different figures represent a half-front right train of a vehicle referenced in space by the reference XY Z. The front axle being symmetrical with respect to the longitudinal axis X 'of the vehicle, only the right front half-axle is shown and described.
Le véhicule est symbolisé par son axe longitudinal X' et par son axe vertical Z', perpendiculaire à l'axe longitudinal X' et au plan du sol S sur lequel évolue le véhicule.The vehicle is symbolized by its longitudinal axis X 'and its vertical axis Z' perpendicular to the longitudinal axis X 'and the ground plane S on which the vehicle is moving.
Sur les différentes figures, les mêmes références sont utilisées pour désigner les mêmes éléments.In the different figures, the same references are used to designate the same elements.
Les différents dessins ne respectent pas d'échelle précise.The different drawings do not respect precise scale.
Enfin, sur les figures 1 et 4, la caisse du véhicule n'a pas été volontairement représentée pour une raison de clarté.Finally, in Figures 1 and 4, the vehicle body has not been voluntarily represented for reasons of clarity.
Le train avant selon l'invention comporte une lame transversale 1 réalisée de préférence en matériau composite, et s'étendant transversalement par rapport au véhicule selon la direction Y.The front axle according to the invention comprises a transverse blade 1 preferably made of composite material, and extending transversely with respect to the vehicle in the Y direction.
L'axe longitudinal de la lame 1 est sensiblement centré sur l'axe des roues 11.The longitudinal axis of the blade 1 is substantially centered on the axis of the wheels 11.
La partie extrême 2 de la lame 1 est reliée au pivot de roue 3 par l'intermédiaire d'un support de pivot 4 qui prend solidairement en sandwich la partie extrême 2 de la lame 1.The end portion 2 of the blade 1 is connected to the wheel pivot 3 via a pivot support 4 which integrally sandwiches the end portion 2 of the blade 1.
La lame 1 est suspendue sous la caisse 5 du véhicule (Figure 2) par l'intermédiaire d'un support 6, disposé sensiblement entre la partie extrêmeThe blade 1 is suspended under the body 5 of the vehicle (FIG. 2) by means of a support 6, disposed substantially between the extreme part
2 de la lame 1 et l'axe longitudinal X' du véhicule et qui s'étend transversalement par rapport à la lame 1 selon une direction sensiblement parallèle à l'axe longitudinal X' du véhicule.2 of the blade 1 and the longitudinal axis X 'of the vehicle and which extends transversely to the blade 1 in a direction substantially parallel to the longitudinal axis X' of the vehicle.
Le support 6 est par exemple constitué de deux barres rectilignes de section rectangulaire, assemblées l'une sur l'autre, dont l'une est plate et l'autre est pliée de manière à enserrer localement la lame 1 pour la prendre en sandwich.The support 6 is for example constituted by two rectilinear bars of rectangular section, assembled one on the other, one of which is flat and the other is folded so as to locally grip the blade 1 to sandwich it.
Le support 6 est fixé à la caisse 5 du véhicule par des premier et second moyens de fixation 7 et 8, par exemple des vis, qui sont disposés respectivement aux deux extrémités du support 6. Des première et seconde articulations élastiques 9 et 10, formant entretoises et au travers desquels passent les moyens de fixations, sont interposées entre le support 6 et la caisse 5.The support 6 is fixed to the body 5 of the vehicle by first and second fixing means 7 and 8, for example screws, which are respectively disposed at both ends of the support 6. First and second elastic joints 9 and 10, forming spacers and through which pass the attachment means, are interposed between the support 6 and the body 5.
Les moyens de fixation 7 et 8 et les articulations 9 et 10 sont alignés dans la direction longitudinale X et le premier moyen de fixation 7 et la seconde articulation 9 sont adjacents à la lame transversale 1.The fastening means 7 and 8 and the joints 9 and 10 are aligned in the longitudinal direction X and the first fixing means 7 and the second articulation 9 are adjacent to the transverse blade 1.
L'extrémité BS de la lame 1 ainsi suspendue sous la caisse 5, dépasse de la caisse 5 et forme un bras de suspension en porte à faux par rapport à la caisse 5 (Figure 3).The end BS of the blade 1 thus suspended under the body 5, protrudes from the body 5 and forms a suspension arm cantilever with respect to the body 5 (Figure 3).
Ainsi, lors du débattement des roues 11 selon la direction Z (verticale), la lame 1 se déforme suivant le principe d'une poutre travaillant en flexion prenant appui sous la caisse 5 via les deux articulations 9 et 10.Thus, during the movement of the wheels 11 in the Z (vertical) direction, the blade 1 is deformed according to the principle of a beam working in flexion bearing under the body 5 via the two joints 9 and 10.
L'épaisseur de la lame 1 étant faible par rapport à sa largeur et sa longueur, la fonction ressort est alors assurée par la lame 1 pour un débattement verticale symétrique des roues 11 par rapport à l'axe longitudinal X' (cas du pompage).The thickness of the blade 1 being small relative to its width and its length, the spring function is then provided by the blade 1 for a symmetrical vertical travel of the wheels 11 relative to the longitudinal axis X '(pumping case) .
Lors de débattements verticaux dissymétriques des roues 11 (situation de dévers), la lame 1 reliant les deux roues 11 du train avant prend une forme de « S » selon la direction Y et assure alors la fonction anti-dévers.During asymmetric vertical movements of the wheels 11 (tilt situation), the blade 1 connecting the two wheels 11 of the front axle takes a shape of "S" in the Y direction and then provides the anti-roll function.
La fonction de reprise des efforts longitudinaux au freinage (efforts s'opposant au déplacement du véhicule suivant l'axe X) est assurée par une biellette rectiligne 12 qui est fixée entre la partie extrême 2 de la lame 1 , sur le support pivot 4, et le support 6 de la lame 1 (effort s'opposant au déplacement du véhicule suivant l'axe X).The function of recovery of the longitudinal forces under braking (efforts opposing the displacement of the vehicle along the X axis) is provided by a straight rod 12 which is fixed between the end portion 2 of the blade 1, on the pivot support 4, and the support 6 of the blade 1 (force opposing the movement of the vehicle along the X axis).
Les extrémités de la biellette 12 sont respectivement fixées sur le support pivot 4 via une articulation élastique 13, et sur la seconde articulation 10 du support 6.The ends of the rod 12 are respectively fixed on the pivot support 4 via an elastic articulation 13, and on the second articulation 10 of the support 6.
Le train avant selon l'invention n'utilisant pas de berceau, la crémaillère de direction 14 est fixée entre, et sur, les deux supports 6 de lame 1.Since the front axle according to the invention does not use a cradle, the steering rack 14 is fixed between and on the two blade supports 1.
L'extrémité libre de la biellette de direction 15 est couplée par une liaison pivot connue en soi, au pivot de roue 3. Avec une telle architecture, la géométrie de l'ensemble du train peut alors être maîtrisée. Autrement dit, le bon positionnement de la direction par rapport à la lame, et donc de la direction par rapport au pivot, est assuré.The free end of the steering rod 15 is coupled by a pivot connection known per se, to the wheel pivot 3. With such an architecture, the geometry of the entire train can then be controlled. In other words, the correct positioning of the direction relative to the blade, and therefore the direction relative to the pivot, is ensured.
Des moyens de fixation 16 de la crémaillère 14 sur le support 6 sont disposés au voisinage de la seconde articulation 10.Fastening means 16 of the rack 14 on the support 6 are arranged in the vicinity of the second hinge 10.
Comme illustré plus particulièrement sur la figure 3, la lame 1 « reprend » les efforts transversaux imposés à la base de la roue 11 lors des virages. Elle assure ainsi une bonne rigidité du plan de roue 11 face aux efforts transversaux symbolisés par la flèche F ; la biellette 12 « reprenant » les efforts longitudinaux en cas de freinage. Ainsi, la lame 1 travaille en flexion dans la direction verticale Z lors des débattements de la roue 11 et en traction / compression lors des virages. La lame 1 ne travaille pas en flexion dans la direction longitudinale lors des freinages.As illustrated more particularly in FIG. 3, the blade 1 "takes up" the transverse forces imposed on the base of the wheel 11 during turns. It thus ensures a good rigidity of the wheel plane 11 facing the transverse forces symbolized by the arrow F; the rod 12 "taking up" the longitudinal forces in case of braking. Thus, the blade 1 works in flexion in the vertical direction Z during deflections of the wheel 11 and in traction / compression during turns. The blade 1 does not work in flexion in the longitudinal direction during braking.
La dimension de la lame 1 peut donc être réduite, ce qui permet d'en diminuer le coût, diminution d'autant plus importante dans le cas d'une lame 1 réalisée en matériau composite. Le coût global de l'architecture est alors réduit par rapport aux solutions antérieures.The dimension of the blade 1 can therefore be reduced, which makes it possible to reduce the cost thereof, a decrease which is all the greater in the case of a blade 1 made of composite material. The overall cost of the architecture is then reduced compared to previous solutions.
La lame 1 est de préférence réalisée en matériau composite de type fibre de verre / résine époxy afin de permettre un débattement vertical de la roue 11 suffisant sans endommager le matériau. D'autre part, l'orientation des fibres peut être essentiellement transversale afin d'augmenter les caractéristiques dans cette direction.The blade 1 is preferably made of fiberglass / epoxy resin composite material in order to allow a vertical clearance of the sufficient wheel 11 without damaging the material. On the other hand, the orientation of the fibers can be essentially transverse in order to increase the characteristics in this direction.
La figure 4 illustre une variante de réalisation d'un train avant selon l'invention dans laquelle les moyens de reprise des efforts longitudinaux au freinage, qui étaient constitués par les biellettes 12, sont remplacés par une barre anti-dévers 17.FIG. 4 illustrates an alternative embodiment of a front axle according to the invention in which the means for taking up the longitudinal forces during braking, which were constituted by the rods 12, are replaced by an anti-roll bar 17.
A la manière d'une architecture de train avant de type Mac-Pherson intégral, c'est la barre anti-dévers 17 qui, dans cette variante, « reprend » les efforts longitudinaux. La partie droite 18 de la barre anti-dévers 17 s'étend parallèlement à la lame transversale 1. La barre anti-dévers 17 se termine à chacune de ses extrémités par une partie droite coudée 19 s'étendant sensiblement à 45° vers l'avant du véhicule.In the manner of an integral Mac-Pherson front axle architecture, it is the anti-roll bar 17 which, in this variant, "resumes" the longitudinal forces. The right part 18 of the anti-roll bar 17 extends parallel to the transverse blade 1. The anti-roll bar 17 terminates at each of its ends by a bent right portion 19 extending substantially at 45 ° towards the front of the vehicle.
La partie extrême 20 de la partie droite coudées 19 est fixée sur le support pivot 4 par un moyen de fixation élastique 21 , par exemple, une articulation en caoutchouc, et la partie droite 18 de la barre anti-dévers 17, située juste avant la partie coudée 19, est fixée sur le support 6, à proximité de la seconde articulation 10, par une liaison pivot élastique 22, par exemple, un palier en matière caoutchouc. Cette variante permet de lever une contrainte sur le dimensionnement de la lame 1 qui n'assure plus à elle seule l'intégralité de la fonction barre anti-dévers du train.The end portion 20 of the right bent portion 19 is fixed on the pivot support 4 by an elastic fastening means 21, for example a rubber hinge, and the right portion 18 of the anti-roll bar 17, located just before the part bent 19, is fixed on the support 6, near the second joint 10, by an elastic pivot connection 22, for example, a bearing made of rubber material. This variant makes it possible to lift a constraint on the dimensioning of the blade 1 which no longer ensures the entire anti-roll bar function of the train.
Ainsi, avec le train avant selon l'invention, l'extrémité BS de la lame 1 , le support 6 et le moyen de reprise d'efforts 12 ou 17 définissent sensiblement et respectivement les trois côtés d'un triangle de suspension. Thus, with the front axle according to the invention, the end BS of the blade 1, the support 6 and the effort recovery means 12 or 17 define substantially and respectively the three sides of a suspension triangle.

Claims

REVENDICATIONS
1. Train avant de véhicule, notamment de véhicule automobile, supportant chacune des roues directrices (11 ) du véhicule par l'intermédiaire d'un support de pivot de roue (4), le dit train comportant une suspension comportant une lame transversale (1 ) en matériau composite, fixée à la caisse (5) du véhicule, et dont chaque partie extrême (2) est reliée solidairement au support de pivot de roue (4), caractérisé en ce que chaque extrémité (BS) de la lame transversale (1 ) est suspendue sous la caisse (5) du véhicule par un support (6) prenant en sandwich l'extrémité (BS) de la lame (1 ) et, en ce qu'un moyen de reprise des efforts longitudinaux au freinage (12 ; 17 ) est disposé entre le support (6) de la lame (1 ) et le support de pivot de roue (4) ; l'extrémité (BS) de la lame (1 ), le support (6) et le moyen de reprise d'efforts (12 ; 17) définissant sensiblement et respectivement les trois côtés d'un triangle de suspension.1. A vehicle front train, in particular a motor vehicle, supporting each of the steering wheels (11) of the vehicle via a wheel pivot support (4), said train comprising a suspension comprising a transverse blade (1). ) of composite material, fixed to the body (5) of the vehicle, and each end portion (2) is integrally connected to the wheel pivot support (4), characterized in that each end (BS) of the transverse blade ( 1) is suspended under the body (5) of the vehicle by a support (6) sandwiching the end (BS) of the blade (1) and, in that a means for taking up longitudinal forces when braking (12). 17) is disposed between the support (6) of the blade (1) and the wheel pivot support (4); the end (BS) of the blade (1), the support (6) and the force-taking means (12; 17) defining substantially and respectively the three sides of a suspension triangle.
2. Train avant selon la revendication 1 , caractérisé en ce que le support (6) est rapporté sur la lame (1 ) et s'étend transversalement par rapport à elle selon une direction sensiblement parallèle à l'axe longitudinal (X') du véhicule ; des premier et second moyens de fixation (7 et 8) étant disposés respectivement aux deux extrémités du support (6) par l'intermédiaire de première et seconde articulations élastiques (9 et 10) pour fixer le support (6) à la caisse (5) du véhicule ; la première articulation (9) étant adjacente à la lame transversale (1 ).2. Front axle according to claim 1, characterized in that the support (6) is attached to the blade (1) and extends transversely to it in a direction substantially parallel to the longitudinal axis (X ') of the vehicle; first and second fastening means (7 and 8) being respectively disposed at both ends of the support (6) via first and second resilient hinges (9 and 10) for securing the support (6) to the body (5). ) of the vehicle ; the first articulation (9) being adjacent to the transverse blade (1).
3. Train avant selon la revendication 2, caractérisé en ce que le moyen de reprise des efforts longitudinaux au freinage est une biellette rectiligne3. Front axle according to claim 2, characterized in that the means of recovery of longitudinal forces braking is a straight rod
(12) dont les extrémités sont respectivement fixées sur le support pivot (4) via une articulation élastique (13), et sur la seconde articulation (10) du support (6).(12) whose ends are respectively fixed on the pivot support (4) via an elastic hinge (13), and on the second hinge (10) of the support (6).
4. Train avant selon la revendication 2, caractérisé en ce que le moyen de reprise des efforts longitudinaux au freinage est la partie coudée rectiligne4. Front axle according to claim 2, characterized in that the means for taking up the longitudinal forces during braking is the straight bent portion.
(19) d'une barre anti-dévers (17) s'étendant parallèlement à la lame transversale (1 ) ; la partie extrême (20) de la partie coudée rectiligne (19) de la barre anti-dévers (17) étant fixée sur le support de pivot de roue (4) par un moyen de fixation élastique (21 ) et la partie extrême de la partie droite (18) de la barre anti-dévers (17), non coudée, étant fixée sur le support (6), à proximité de la seconde articulation (10), par une liaison pivot élastique (22).(19) an anti-roll bar (17) extending parallel to the blade transverse (1); the end part (20) of the straight bent part (19) of the anti-roll bar (17) being fixed on the wheel pivot support (4) by an elastic fixing means (21) and the end part of the right portion (18) of the anti-roll bar (17), not bent, being fixed on the support (6), near the second articulation (10), by an elastic pivot connection (22).
5. Train avant selon l'une quelconque des revendications 2 à 4, caractérisé en ce que le support (6) de la lame (1 ) est également utilisé comme support d'une crémaillère de direction (14) ; des moyens de fixation (16) de la crémaillère (14) sur le support (6) étant disposés au voisinage de la seconde articulation (10) du support (6).5. Front axle according to any one of claims 2 to 4, characterized in that the support (6) of the blade (1) is also used as a support for a steering rack (14); fastening means (16) of the rack (14) on the support (6) being arranged in the vicinity of the second articulation (10) of the support (6).
6. Train avant selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque support (6) est disposé sensiblement entre la partie extrême (2) de la lame (1 ) et l'axe longitudinal (X') du véhicule.6. Front axle according to any one of the preceding claims, characterized in that each support (6) is disposed substantially between the end portion (2) of the blade (1) and the longitudinal axis (X ') of the vehicle.
7. Train avant selon l'une des revendications précédentes, caractérisé en ce que l'axe longitudinal de la lame (1 ) est sensiblement centré sur l'axe des roues (11 ).7. Front axle according to one of the preceding claims, characterized in that the longitudinal axis of the blade (1) is substantially centered on the axis of the wheels (11).
8. Véhicule automobile comportant un train avant selon l'une quelconque des revendications précédentes. 8. Motor vehicle comprising a front axle according to any one of the preceding claims.
EP10725365A 2009-04-15 2010-04-07 Front end assembly for a motor vehicle comprising a suspension with a transverse blade Withdrawn EP2419285A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0952457A FR2944478B1 (en) 2009-04-15 2009-04-15 FRONT TRAIN FOR MOTOR VEHICLE HAVING A TRANSVERSE BLADE SUSPENSION.
PCT/FR2010/050669 WO2010119212A1 (en) 2009-04-15 2010-04-07 Front end assembly for a motor vehicle comprising a suspension with a transverse blade

Publications (1)

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EP2419285A1 true EP2419285A1 (en) 2012-02-22

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EP10725365A Withdrawn EP2419285A1 (en) 2009-04-15 2010-04-07 Front end assembly for a motor vehicle comprising a suspension with a transverse blade

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US (1) US20120049482A1 (en)
EP (1) EP2419285A1 (en)
JP (1) JP2012523980A (en)
CN (1) CN102458887B (en)
BR (1) BRPI1006607A2 (en)
FR (1) FR2944478B1 (en)
WO (1) WO2010119212A1 (en)

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CN102458887A (en) 2012-05-16
JP2012523980A (en) 2012-10-11
FR2944478B1 (en) 2011-04-15
US20120049482A1 (en) 2012-03-01
CN102458887B (en) 2014-04-30
WO2010119212A1 (en) 2010-10-21
BRPI1006607A2 (en) 2016-04-19
FR2944478A1 (en) 2010-10-22

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