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WO2010058133A1 - Integral control arm of an automobile - Google Patents

Integral control arm of an automobile Download PDF

Info

Publication number
WO2010058133A1
WO2010058133A1 PCT/FR2009/052229 FR2009052229W WO2010058133A1 WO 2010058133 A1 WO2010058133 A1 WO 2010058133A1 FR 2009052229 W FR2009052229 W FR 2009052229W WO 2010058133 A1 WO2010058133 A1 WO 2010058133A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
suspension arm
ring
vehicle
monobloc
Prior art date
Application number
PCT/FR2009/052229
Other languages
French (fr)
Inventor
Frédéric AUGE
Benjamin Petit
Original Assignee
Peugeot Citroën 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 Citroën Automobiles SA filed Critical Peugeot Citroën Automobiles SA
Publication of WO2010058133A1 publication Critical patent/WO2010058133A1/en

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
    • 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
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/02—Attaching arms to sprung part of vehicle
    • 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
    • B60G2200/40—Indexing codes relating to the wheels in the suspensions
    • B60G2200/446—Non-steerable wheels
    • 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
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/124—Mounting of coil springs
    • B60G2204/1246—Mounting of coil springs on twist beam 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
    • B60G2206/017—Constructional features of suspension elements, e.g. arms, dampers, springs forming an eye for the bushing
    • 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
    • B60G2206/10—Constructional features of arms
    • 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
    • B60G2206/10—Constructional features of arms
    • B60G2206/11—Constructional features of arms the arm being a radius or track or torque or steering rod or stabiliser end link
    • 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
    • B60G2206/10—Constructional features of arms
    • B60G2206/14—Constructional features of arms the arm forming a U-shaped recess for fitting a bush
    • B60G2206/141—The recess being integrally or seamlessly formed
    • 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
    • B60G2206/10—Constructional features of arms
    • B60G2206/16—Constructional features of arms the arm having a U profile and/or made of a plate
    • 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
    • B60G2206/70—Materials used in suspensions
    • B60G2206/72—Steel
    • B60G2206/722—Plates
    • 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
    • B60G2206/8102—Shaping by stamping
    • 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
    • B60G2206/8103—Shaping by folding or bending
    • 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
    • B60G2206/82—Joining
    • B60G2206/8209—Joining by deformation
    • B60G2206/82092—Joining by deformation by press-fitting
    • 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
    • B60G2206/83—Punching

Definitions

  • the present invention relates to a motor vehicle suspension arm, and a vehicle equipped with these arms on a rear axle.
  • Some motor vehicles have a rear axle comprising a cross member supporting at its ends the hubs of the wheels.
  • Two longitudinal suspension arms arranged on the sides of the body are fixed forwardly to this body by a hinge having a substantially transverse axis, and rearwardly to the cross member to maintain and guide it.
  • Suspension springs are supported on each side on the cross, to carry the body and allow a vertical movement of the wheels. Shocks mounted in parallel with these springs, to slow the oscillation movements of the suspension.
  • the suspension arms maintain the crosspiece and guide its movements during the movements of the suspension, they transmit to the body in reaction the different forces that apply to the wheels, especially in bends and braking. These suspension arms therefore undergo significant efforts.
  • each suspension arm comprises a body made from a pressed and cut steel sheet to form a substantially flat elongated shape.
  • This flat shape is arranged longitudinally on the vehicle, in a vertical plane.
  • At the front end of this suspension arm is fixed by welding a ring made in a drawn steel tube, or by rolling and welding a sheet, this ring being disposed along a transverse axis.
  • the ring will receive an internal rubber having an axial tube to form an elastic hinge, allowing oscillation of the suspension arm along the transverse axis.
  • the elastic articulation filters vibrations coming wheel when driving, to avoid transmitting to the vehicle.
  • a reinforcement formed of a welded sheet on an edge of this body, in a perpendicular plane to form a section "T", the front end of this reinforcement is also welded on the outside of the ring.
  • this suspension arm It is therefore necessary to assemble this suspension arm, supply three components, the body, the ring and the reinforcement, then provide consumables for soldering.
  • This type of suspension arm therefore requires significant logistics to supply and store the various components to assemble.
  • the present invention is intended to avoid these disadvantages of the prior art, and to provide the realization of a motor vehicle suspension arm, a simple and economical solution.
  • a monobloc suspension arm of a motor vehicle comprising a body comprising a first pressed steel sheet and cut to form an elongate and flat shape, disposed on the vehicle substantially longitudinally and in a vertical plane, this body comprising at one end a ring disposed along an axis perpendicular to the flat shape, which receives a fixing hinge on the vehicle body, characterized in that the ring is made of material with the sheet of the body, after stamping of this sheet.
  • a main advantage of the suspension arm according to the invention is that the ring being formed of the same part with the body of the arm, this arm is simpler and more economical to achieve.
  • the suspension arm according to the invention may comprise one or more of the following characteristics, which may be combined with one another.
  • it forms by stamping at the end of the sheet constituting the body, a circular ring disposed substantially in the plane of this sheet, which internally receives the ring.
  • an axial flange is formed by stamping inside the circular ring, disposed along a transverse axis and turned on one side, extending by an internal fold of the sheet towards the center, folded about 180 °, to end with a cylindrical ring turned on the other side.
  • the cylindrical ring may be axially substantially centered with respect to the median plane located in the thickness of the body.
  • the body of the suspension arm comprises a second sheet forming a second thickness contiguous on the first sheet of this body.
  • the second sheet may be formed from the first sheet of the body, by folding the sheet on itself along a longitudinal edge of the body.
  • the second sheet of the body extends over the entire length of this body.
  • the invention also relates to a motor vehicle comprising a rear axle having two substantially longitudinal suspension arms connecting the rear wheels to the body of this vehicle, characterized in that these suspension arms are made as described above.
  • FIG. 1 is an overall perspective view of a rear train according to the prior art
  • FIG. 2 is a view of a suspension arm of the rear axle
  • FIG. 3 is a view of a suspension arm according to the invention
  • FIG. 4 is a detail view of the front portion of the suspension arm.
  • FIG. 5 is a sectional view along a horizontal plane passing through the axis of the ring, the front portion of the suspension arm.
  • Figures 1 and 2 show a rear axle 1 comprising a cross member 2 arranged transversely, which receives at its ends unrepresented hubs, supporting the rear wheels.
  • the cross is on each side connected to the front, to a suspension arm 4 arranged longitudinally.
  • Each suspension arm 4 has on the front side an elastic articulation connected to the vehicle body, which allows pivoting along an axis arranged substantially transversely.
  • the rear cross member comprises rearwardly and on each side, supports 10 on which reside the suspension springs supporting the vehicle body.
  • the rear arm 4 is made by an assembly of different components, comprising an elongated body 20 which is stamped into a thick plate, having a cut forming a circular arc towards the front.
  • a ring 8 is fitted and welded in this arcuate cutout of the body 20, the axis of this ring being disposed perpendicularly to the sheet of this body.
  • This ring 8 can be made in a drawn steel tube, or by rolling and welding a flat sheet.
  • the ring 8 constitutes a housing containing an elastic block 6, comprising an axial tube which receives a clamping screw.
  • This elastic block 6 is inserted in a not shown yoke, fixed on the vehicle body, the clamping screw passing through the assembly to form an elastic connection pivotable along the axis of this screw.
  • the manufacture of the ring in particular by stretching a tube, or rolling and welding a sheet, requires several successive industrial operations. These are relatively expensive methods.
  • a reinforcement 22 comprising a sheet metal strip, is welded perpendicularly to the body 20 on an edge of this body, the axis of this reinforcement being centered on the sheet of the body.
  • the small front side of this reinforcement 22 is also welded to the ring 8, to form a structure in the space strongly stiffening the connection between this ring and the body 20, in order to transmit significant forces.
  • welds including a "MAG" method using a welding wire for a supply of material requires a rigorous control of the process and periodic maintenance to ensure a consistent quality of this operation.
  • this suspension arm 4 requires the prior manufacture of several components that must be managed and stored, these fabrications using various methods. Logistics costs to supply the basic components are to be added to the manufacturing costs.
  • FIGS. 3 to 5 show a suspension arm 31 made from a relatively thin stamped steel sheet, comprising an elongated part forming a body 30, consisting of two thicknesses 32, 34 folded one on the other following a longitudinal edge, to strongly stiffen the body.
  • a circular ring 40 is formed at the front end of the first plate thickness 32, centered along the longitudinal axis of the arm 31, and which remains in the plane of this first thickness.
  • This circular ring 40 is formed by stamping an axial flange 36 disposed along a transverse axis, which is turned on the opposite side to the second thickness 34.
  • This axial flange 36 ends with an inner fold from the sheet towards the center, to form after a return following 180 °, a cylindrical ring 38 turned on the other side.
  • the cylindrical ring 38 having a diameter greater than its length, is axially substantially centered with respect to the median plane located between the two thicknesses of the sheets 32, 34 of the body 30.
  • This cylindrical ring 38 having internal dimensions similar to those of the ring 8 of the suspension arm 4 made according to the prior art, can receive the same elastic joint 6.
  • the second thickness 34 of sheet metal forming the reinforcement of the body 30 of this arm extends over the entire length of this body and ends closest to the cylindrical ring 38.
  • a suspension arm 31 having a cylindrical ring 8 made and assembled during a single drawing operation is economically formed.
  • a very rigid connection With the rounded flange connecting the circular ring 40 to the cylindrical ring 38 is formed between the body 30 of the arm 31 and the ring, a very rigid connection. In addition, this connection does not involve the risk of a faulty weld.
  • the forming and cutting operations can be performed with a single press, comprising the same tool comprising the different successive stamping steps. This process is simple, requiring no management or additional component assembly. The logistics required for this production can be simplified, saving time and storage space in the workshops.
  • welds can be made on the suspension arm 31 to stiffen them, in particular between the two sheet thicknesses 32, 34 of the body 30.

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

Abstract

The invention relates to an integral control arm of an automobile, comprising a body (30) including a first steel plate (32) stamped and cut to make an elongate, flat shape, arranged on the vehicle substantially longitudinally and in a vertical plane, said body (30) including, at one end, a ring (38) arranged along an axis perpendicular to the flat shape, receiving a hinge for attachment to the body shell of the vehicle, characterised in that the ring is integral with the steel plate (32) of the body (30), after stamping said steel plate.

Description

BRAS DE SUSPENSION MONOBLOC DE VEHICULE AUTOMOBILE MONOBLOC SUSPENSION ARM FOR A MOTOR VEHICLE
La présente invention concerne un bras de suspension de véhicule automobile, ainsi qu'un véhicule équipé de ces bras sur un train arrière.The present invention relates to a motor vehicle suspension arm, and a vehicle equipped with these arms on a rear axle.
Certains véhicules automobiles comportent un train arrière comprenant une traverse supportant à ses extrémités les moyeux des roues. Deux bras de suspension longitudinaux disposés sur les côtés de la caisse, sont fixés vers l'avant à cette caisse par une articulation comportant un axe sensiblement transversal, et vers l'arrière à la traverse pour la maintenir et la guider.Some motor vehicles have a rear axle comprising a cross member supporting at its ends the hubs of the wheels. Two longitudinal suspension arms arranged on the sides of the body, are fixed forwardly to this body by a hinge having a substantially transverse axis, and rearwardly to the cross member to maintain and guide it.
Des ressorts de suspension prennent appui de chaque côté sur la traverse, pour porter la caisse et permettre un débattement vertical des roues. Des amortisseurs montés en parallèle de ces ressorts, permettent de freiner les mouvements d'oscillation de la suspension.Suspension springs are supported on each side on the cross, to carry the body and allow a vertical movement of the wheels. Shocks mounted in parallel with these springs, to slow the oscillation movements of the suspension.
Les bras de suspension maintiennent la traverse et guident ses mouvements pendant les débattements de la suspension, ils transmettent à la caisse en réaction les différents efforts qui s'appliquent sur les roues, notamment dans les virages et au freinage. Ces bras de suspension subissent donc des efforts importants.The suspension arms maintain the crosspiece and guide its movements during the movements of the suspension, they transmit to the body in reaction the different forces that apply to the wheels, especially in bends and braking. These suspension arms therefore undergo significant efforts.
Suivant une technologie connue, chaque bras de suspension comporte un corps réalisé à partir d'une tôle d'acier emboutie et découpée, pour constituer une forme allongée sensiblement plate. Cette forme plate est disposée longitudinalement sur le véhicule, suivant un plan vertical. A l'extrémité avant de ce bras de suspension, on fixe par soudure une bague réalisée dans un tube en acier étiré, ou par roulage et soudage d'une tôle, cette bague étant disposée suivant un axe transversal. La bague va recevoir un caoutchouc interne comportant un tube axial pour former une articulation élastique, permettant une oscillation du bras de suspension suivant l'axe transversal. L'articulation élastique filtre des vibrations venant de la roue lors du roulage, pour éviter de les transmettre à la caisse du véhicule.According to a known technology, each suspension arm comprises a body made from a pressed and cut steel sheet to form a substantially flat elongated shape. This flat shape is arranged longitudinally on the vehicle, in a vertical plane. At the front end of this suspension arm, is fixed by welding a ring made in a drawn steel tube, or by rolling and welding a sheet, this ring being disposed along a transverse axis. The ring will receive an internal rubber having an axial tube to form an elastic hinge, allowing oscillation of the suspension arm along the transverse axis. The elastic articulation filters vibrations coming wheel when driving, to avoid transmitting to the vehicle.
Pour renforcer la liaison du corps avec la bague, on ajoute un renfort formé d'une tôle soudée sur un bord de ce corps, dans un plan perpendiculaire pour constituer une section en « T », l'extrémité avant de ce renfort étant aussi soudée sur l'extérieur de la bague.To strengthen the connection of the body with the ring, is added a reinforcement formed of a welded sheet on an edge of this body, in a perpendicular plane to form a section "T", the front end of this reinforcement is also welded on the outside of the ring.
Il faut donc pour assembler ce bras de suspension, approvisionner trois composants, le corps, la bague et le renfort, puis prévoir les produits consommables pour la soudure. Ce type de bras de suspension nécessite donc une logistique importante pour approvisionner et stocker les différents composants à assembler. De plus utilisant plusieurs procédés de fabrication différents, emboutissage, roulage ou étirage pour la bague, et soudure, et nécessitant pour le corps principal des tôles de forte épaisseur qui ne sont pas dans les standards habituels des applications automobiles, ces bras de suspension sont relativement onéreux.It is therefore necessary to assemble this suspension arm, supply three components, the body, the ring and the reinforcement, then provide consumables for soldering. This type of suspension arm therefore requires significant logistics to supply and store the various components to assemble. Moreover using several different manufacturing processes, stamping, rolling or drawing for the ring, and welding, and requiring for the main body thick sheets which are not in the usual standards of automotive applications, these suspension arms are relatively expensive.
La présente invention a notamment pour but d'éviter ces inconvénients de la technique antérieure, et d'apporter à la réalisation d'un bras de suspension de véhicule automobile, une solution simple et économique.The present invention is intended to avoid these disadvantages of the prior art, and to provide the realization of a motor vehicle suspension arm, a simple and economical solution.
Elle propose à cet effet un bras de suspension monobloc de véhicule automobile, comportant un corps comprenant une première tôle d'acier emboutie et découpée pour réaliser une forme allongée et plate, disposée sur le véhicule sensiblement longitudinalement et suivant un plan vertical, ce corps comprenant à une extrémité une bague disposée suivant un axe perpendiculaire à la forme plate, qui reçoit une articulation de fixation sur la caisse du véhicule, caractérisé en ce que la bague vient de matière avec la tôle du corps, après emboutissage de cette tôle.It proposes for this purpose a monobloc suspension arm of a motor vehicle, comprising a body comprising a first pressed steel sheet and cut to form an elongate and flat shape, disposed on the vehicle substantially longitudinally and in a vertical plane, this body comprising at one end a ring disposed along an axis perpendicular to the flat shape, which receives a fixing hinge on the vehicle body, characterized in that the ring is made of material with the sheet of the body, after stamping of this sheet.
Un avantage principal du bras de suspension selon l'invention, est que la bague étant formée d'une même pièce avec le corps du bras, ce bras est plus simple et plus économique à réaliser. De plus le bras de suspension selon l'invention peut comporter une ou plusieurs des caractéristiques suivantes, qui peuvent être combinées entre elles.A main advantage of the suspension arm according to the invention is that the ring being formed of the same part with the body of the arm, this arm is simpler and more economical to achieve. In addition, the suspension arm according to the invention may comprise one or more of the following characteristics, which may be combined with one another.
Avantageusement, on forme par emboutissage à l'extrémité de la tôle constituant le corps, un anneau circulaire disposé sensiblement dans le plan de cette tôle, qui reçoit intérieurement la bague.Advantageously, it forms by stamping at the end of the sheet constituting the body, a circular ring disposed substantially in the plane of this sheet, which internally receives the ring.
Avantageusement, on forme par emboutissage à l'intérieur de l'anneau circulaire, un rebord axial disposé suivant un axe transversal et tourné d'un côté, se prolongeant par un repli intérieur de la tôle vers le centre, plié suivant environ 180°, pour se terminer par une bague cylindrique tournée de l'autre côté.Advantageously, an axial flange is formed by stamping inside the circular ring, disposed along a transverse axis and turned on one side, extending by an internal fold of the sheet towards the center, folded about 180 °, to end with a cylindrical ring turned on the other side.
La bague cylindrique peut être axialement sensiblement centrée, par rapport au plan médian situé dans l'épaisseur du corps.The cylindrical ring may be axially substantially centered with respect to the median plane located in the thickness of the body.
Selon une disposition particulière, le corps du bras de suspension comporte une deuxième tôle formant une deuxième épaisseur accolée sur la première tôle de ce corps.According to a particular arrangement, the body of the suspension arm comprises a second sheet forming a second thickness contiguous on the first sheet of this body.
La deuxième tôle peut être formée à partir de la première tôle du corps, en repliant cette tôle sur elle-même suivant un bord longitudinal de ce corps. Avantageusement, la deuxième tôle du corps s'étend sur toute la longueur de ce corps.The second sheet may be formed from the first sheet of the body, by folding the sheet on itself along a longitudinal edge of the body. Advantageously, the second sheet of the body extends over the entire length of this body.
L'invention a aussi pour objet un véhicule automobile comprenant un train arrière comportant deux bras de suspension sensiblement longitudinaux reliant les roues arrière à la caisse de ce véhicule, caractérisé en ce que ces bras de suspension sont réalisés tels que décrit ci-dessus.The invention also relates to a motor vehicle comprising a rear axle having two substantially longitudinal suspension arms connecting the rear wheels to the body of this vehicle, characterized in that these suspension arms are made as described above.
L'invention sera mieux comprise et d'autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description ci-après, donnée à titre d'exemple en référence aux dessins annexés dans lesquels :The invention will be better understood and other features and advantages will appear more clearly on reading the description below, given by way of example with reference to the accompanying drawings in which:
- la figure 1 est une vue d'ensemble en perspective d'un train arrière selon l'art antérieur ;- Figure 1 is an overall perspective view of a rear train according to the prior art;
- la figure 2 est une vue d'un bras de suspension de ce train arrière ; - la figure 3 est une vue d'un bras de suspension selon l'invention ;- Figure 2 is a view of a suspension arm of the rear axle; FIG. 3 is a view of a suspension arm according to the invention;
- la figure 4 est une vue de détail de la partie avant de ce bras de suspension ; et- Figure 4 is a detail view of the front portion of the suspension arm; and
- la figure 5 est une vue en coupe suivant un plan horizontal passant par l'axe de la bague, de la partie avant du bras de suspension.- Figure 5 is a sectional view along a horizontal plane passing through the axis of the ring, the front portion of the suspension arm.
Les figures 1 et 2 représentent un train arrière 1 comprenant une traverse 2 disposée transversalement, qui reçoit à ses extrémités des moyeux non représentés, supportant les roues arrière.Figures 1 and 2 show a rear axle 1 comprising a cross member 2 arranged transversely, which receives at its ends unrepresented hubs, supporting the rear wheels.
La traverse est de chaque côté reliée vers l'avant, à un bras de suspension 4 disposé longitudinalement. Chaque bras de suspension 4 comporte du côté avant une articulation élastique reliée à la caisse du véhicule, qui permet un pivotement suivant un axe disposé sensiblement transversalement.The cross is on each side connected to the front, to a suspension arm 4 arranged longitudinally. Each suspension arm 4 has on the front side an elastic articulation connected to the vehicle body, which allows pivoting along an axis arranged substantially transversely.
La traverse arrière comporte vers l'arrière et de chaque côté, des supports 10 sur lesquels viennent s'appuyer les ressorts de suspension supportant la caisse du véhicule.The rear cross member comprises rearwardly and on each side, supports 10 on which reside the suspension springs supporting the vehicle body.
De cette manière, la traverse 2 est maintenue à la caisse du véhicule par les bras de suspension 4, pour permettre un mouvement des suspensions tout en assurant un guidage des roues arrière. Le bras arrière 4 est réalisé par un assemblage de différents composants, comprenant un corps 20 allongé qui est embouti dans une tôle épaisse, comportant vers l'avant une découpe formant un arc de cercle. Une bague 8 est ajustée et soudée dans cette découpe en arc de cercle du corps 20, l'axe de cette bague étant disposé perpendiculairement à la tôle de ce corps. Cette bague 8 peut être réalisée dans un tube en acier étiré, ou par roulage et soudure d'une tôle plane.In this way, the cross member 2 is held at the vehicle body by the suspension arms 4, to allow movement of the suspensions while ensuring guidance of the rear wheels. The rear arm 4 is made by an assembly of different components, comprising an elongated body 20 which is stamped into a thick plate, having a cut forming a circular arc towards the front. A ring 8 is fitted and welded in this arcuate cutout of the body 20, the axis of this ring being disposed perpendicularly to the sheet of this body. This ring 8 can be made in a drawn steel tube, or by rolling and welding a flat sheet.
La bague 8 constitue un logement contenant un bloc élastique 6, comportant un tube axial qui reçoit une vis de serrage. Ce bloc élastique 6 est inséré dans une chape non représentée, fixée sur la caisse du véhicule, la vis de serrage traversant l'ensemble pour constituer une liaison élastique pouvant pivoter suivant l'axe de cette vis. La fabrication de la bague, notamment par étirage d'un tube, ou roulage et soudure d'une tôle, nécessite plusieurs opérations industrielles successives. Ce sont des procédés relativement coûteux.The ring 8 constitutes a housing containing an elastic block 6, comprising an axial tube which receives a clamping screw. This elastic block 6 is inserted in a not shown yoke, fixed on the vehicle body, the clamping screw passing through the assembly to form an elastic connection pivotable along the axis of this screw. The manufacture of the ring, in particular by stretching a tube, or rolling and welding a sheet, requires several successive industrial operations. These are relatively expensive methods.
Un renfort 22 comprenant une bande de tôle, est soudé perpendiculairement au corps 20 sur un bord de ce corps, l'axe de ce renfort étant centré sur la tôle du corps. Le petit côté avant de ce renfort 22 est soudé aussi sur la bague 8, pour former une structure dans l'espace rigidifiant fortement la liaison entre cette bague et le corps 20, afin de transmettre des efforts importants. La réalisation des soudures avec notamment un procédé « MAG » utilisant un fil de soudure pour un apport de matière, demande un contrôle rigoureux du procédé et une maintenance périodique pour garantir une qualité constante de cette opération.A reinforcement 22 comprising a sheet metal strip, is welded perpendicularly to the body 20 on an edge of this body, the axis of this reinforcement being centered on the sheet of the body. The small front side of this reinforcement 22 is also welded to the ring 8, to form a structure in the space strongly stiffening the connection between this ring and the body 20, in order to transmit significant forces. The realization of welds including a "MAG" method using a welding wire for a supply of material, requires a rigorous control of the process and periodic maintenance to ensure a consistent quality of this operation.
La réalisation de ce bras de suspension 4 nécessite la fabrication préalable de plusieurs composants qu'il faut gérer et stocker, ces fabrications faisant appel à des procédés variés. Des coûts de logistique pour approvisionner les composants de base sont à ajouter aux coûts de fabrication.The production of this suspension arm 4 requires the prior manufacture of several components that must be managed and stored, these fabrications using various methods. Logistics costs to supply the basic components are to be added to the manufacturing costs.
Les figures 3 à 5 présentent un bras de suspension 31 réalisé à partir d'une tôle d'acier emboutie relativement mince, comprenant une partie allongée formant un corps 30, constitué de deux épaisseurs 32, 34 repliées l'une sur l'autre suivant un bord longitudinal, pour rigidifier fortement ce corps.FIGS. 3 to 5 show a suspension arm 31 made from a relatively thin stamped steel sheet, comprising an elongated part forming a body 30, consisting of two thicknesses 32, 34 folded one on the other following a longitudinal edge, to strongly stiffen the body.
Lors des opérations d'emboutissage, on forme à l'extrémité avant de la première épaisseur de tôle 32, un anneau circulaire 40 centré suivant l'axe longitudinal du bras 31 , et qui reste dans le plan de cette première épaisseur.During stamping operations, a circular ring 40 is formed at the front end of the first plate thickness 32, centered along the longitudinal axis of the arm 31, and which remains in the plane of this first thickness.
A l'intérieur de cet anneau circulaire 40 et centré sur lui, on forme par emboutissage un rebord axial 36 disposé suivant un axe transversal, qui est tourné du côté opposé à la deuxième épaisseur 34. Ce rebord axial 36 se termine par un repli intérieur de la tôle vers le centre, pour former après un retour suivant 180°, une bague cylindrique 38 tournée de l'autre côté. La bague cylindrique 38 comportant un diamètre plus important que sa longueur, est axialement sensiblement centrée par rapport au plan médian situé entre les deux épaisseurs des tôles 32, 34 du corps 30. Cette bague cylindrique 38 comportant des dimensions intérieures similaires à celles de la bague 8 du bras de suspension 4 réalisé selon l'art antérieur, peut recevoir une même articulation élastique 6.Inside this circular ring 40 and centered on it, is formed by stamping an axial flange 36 disposed along a transverse axis, which is turned on the opposite side to the second thickness 34. This axial flange 36 ends with an inner fold from the sheet towards the center, to form after a return following 180 °, a cylindrical ring 38 turned on the other side. The cylindrical ring 38 having a diameter greater than its length, is axially substantially centered with respect to the median plane located between the two thicknesses of the sheets 32, 34 of the body 30. This cylindrical ring 38 having internal dimensions similar to those of the ring 8 of the suspension arm 4 made according to the prior art, can receive the same elastic joint 6.
Pour obtenir une bonne rigidité du bras de suspension 31 , la deuxième épaisseur 34 de tôle formant le renfort du corps 30 de ce bras, s'étend sur toute la longueur de ce corps et se termine au plus près de la bague cylindrique 38.To obtain a good rigidity of the suspension arm 31, the second thickness 34 of sheet metal forming the reinforcement of the body 30 of this arm extends over the entire length of this body and ends closest to the cylindrical ring 38.
On forme ainsi de manière économique, un bras de suspension 31 comportant une bague cylindrique 8 réalisée et assemblée lors d'une seule opération d'emboutissage. Avec le rebord arrondi reliant l'anneau circulaire 40 à la bague cylindrique 38, on constitue entre le corps 30 du bras 31 et cette bague, une liaison très rigide. De plus, cette liaison ne comporte pas le risque d'une soudure défectueuse.Thus, a suspension arm 31 having a cylindrical ring 8 made and assembled during a single drawing operation is economically formed. With the rounded flange connecting the circular ring 40 to the cylindrical ring 38 is formed between the body 30 of the arm 31 and the ring, a very rigid connection. In addition, this connection does not involve the risk of a faulty weld.
Les opérations de formage et de découpe peuvent être réalisées avec une seule presse, comportant un même outil comprenant les différentes étapes successives d'emboutissage. Ce procédé est simple, ne nécessitant pas de gestion ni d'assemblage de composant additionnel. La logistique nécessaire pour cette fabrication peut être simplifiée, on gagne du temps et des surfaces de stockage dans les ateliers.The forming and cutting operations can be performed with a single press, comprising the same tool comprising the different successive stamping steps. This process is simple, requiring no management or additional component assembly. The logistics required for this production can be simplified, saving time and storage space in the workshops.
En complément, des soudures peuvent être réalisées sur le bras de suspension 31 pour les rigidifier, notamment entre les deux épaisseurs de tôle 32, 34 du corps 30. In addition, welds can be made on the suspension arm 31 to stiffen them, in particular between the two sheet thicknesses 32, 34 of the body 30.

Claims

REVENDICATIONS
1 - Bras de suspension monobloc de véhicule automobile, comportant un corps (30) comprenant une première tôle d'acier (32) emboutie et découpée pour réaliser une forme allongée et plate, disposée sur le véhicule sensiblement longitudinalement et suivant un plan vertical, ce corps (30) comprenant à une extrémité, une bague (38) disposée suivant un axe perpendiculaire à la forme plate, qui reçoit une articulation de fixation sur la caisse du véhicule, caractérisé en ce que la bague vient de matière avec la tôle (32) du corps (30), après emboutissage de cette tôle.1 - Monobloc suspension arm of a motor vehicle, comprising a body (30) comprising a first steel sheet (32) stamped and cut to produce an elongate and flat shape, disposed on the vehicle substantially longitudinally and in a vertical plane, this body (30) comprising at one end a ring (38) disposed along an axis perpendicular to the flat shape, which receives a fixing hinge on the vehicle body, characterized in that the ring is made of material with the sheet (32). ) of the body (30), after stamping of this sheet.
2 - Bras de suspension monobloc selon la revendication 1 , caractérisé en ce qu'on forme par emboutissage à l'extrémité de la première tôle (32) constituant le corps (30), un anneau circulaire (40) disposé sensiblement dans le plan de cette tôle, qui reçoit intérieurement la bague (38).2 - monobloc suspension arm according to claim 1, characterized in that formed by stamping at the end of the first sheet (32) constituting the body (30), a circular ring (40) disposed substantially in the plane of this sheet, which internally receives the ring (38).
3 - Bras de suspension monobloc selon la revendication 2, caractérisé en ce qu'on forme par emboutissage à l'intérieur de l'anneau circulaire (40), un rebord axial (36) disposé suivant un axe transversal et tourné d'un côté, se prolongeant par un repli intérieur de la tôle vers le centre, plié suivant environ 180°, pour se terminer par une bague cylindrique (38) tournée de l'autre côté.3 - monobloc suspension arm according to claim 2, characterized in that formed by stamping inside the circular ring (40), an axial flange (36) disposed along a transverse axis and turned on one side , extending by an inner fold of the sheet towards the center, bent about 180 °, to end with a cylindrical ring (38) turned on the other side.
4 - Bras de suspension monobloc selon la revendication 3, caractérisé en ce que la bague cylindrique (38) est axialement sensiblement centrée par rapport au plan médian situé dans l'épaisseur du corps (30). 5 - Bras de suspension monobloc selon l'une quelconque des revendications précédentes, caractérisé en ce que le corps (30) du bras de suspension (31 ), comporte une deuxième tôle (34) formant une deuxième épaisseur accolée sur la première tôle (32) de ce corps.4 - monobloc suspension arm according to claim 3, characterized in that the cylindrical ring (38) is axially substantially centered with respect to the median plane located in the thickness of the body (30). 5 - monobloc suspension arm according to any one of the preceding claims, characterized in that the body (30) of the suspension arm (31) comprises a second sheet (34) forming a second thickness contiguous to the first sheet (32). ) of this body.
6 - Bras de suspension monobloc selon la revendication 5, caractérisé en ce que la deuxième tôle (34) est formée à partir de la première tôle (32) du corps, en repliant cette tôle sur elle-même suivant un bord longitudinal de ce corps.6 - monobloc suspension arm according to claim 5, characterized in that the second sheet (34) is formed from the first sheet (32) of the body, by folding this sheet on itself along a longitudinal edge of this body.
7 - Bras de suspension monobloc selon la revendication 5 ou 6, caractérisé en ce que la deuxième tôle (34) du corps (30), s'étend sur toute la longueur de ce corps.7 - monobloc suspension arm according to claim 5 or 6, characterized in that the second sheet (34) of the body (30) extends over the entire length of this body.
8 - Véhicule automobile comprenant un train arrière comportant deux bras de suspension sensiblement longitudinaux (31 ) reliant les roues arrière à la caisse de ce véhicule, caractérisé en ce que ces bras de suspension sont réalisés suivant l'une quelconque des revendications précédentes. 8 - A motor vehicle comprising a rear train comprising two substantially longitudinal suspension arms (31) connecting the rear wheels to the body of this vehicle, characterized in that these suspension arms are made according to any one of the preceding claims.
PCT/FR2009/052229 2008-11-20 2009-11-19 Integral control arm of an automobile WO2010058133A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0857869A FR2938470B1 (en) 2008-11-20 2008-11-20 MONOBLOC SUSPENSION ARM FOR A MOTOR VEHICLE
FR0857869 2008-11-20

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WO2010058133A1 true WO2010058133A1 (en) 2010-05-27

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FR2938470A1 (en) 2010-05-21

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