EP3802171A1 - Barre stabilisatrice pour véhicule - Google Patents

Barre stabilisatrice pour véhicule

Info

Publication number
EP3802171A1
EP3802171A1 EP19724169.8A EP19724169A EP3802171A1 EP 3802171 A1 EP3802171 A1 EP 3802171A1 EP 19724169 A EP19724169 A EP 19724169A EP 3802171 A1 EP3802171 A1 EP 3802171A1
Authority
EP
European Patent Office
Prior art keywords
stabilizer bar
reinforcing member
composite member
composite
reinforcing
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Withdrawn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
EP19724169.8A
Other languages
German (de)
English (en)
Inventor
Bernhard Spielvogel
Johann LANDAUER
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.)
Mubea Carbo Tech GmbH
Original Assignee
Mubea Carbo Tech GmbH
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 Mubea Carbo Tech GmbH filed Critical Mubea Carbo Tech GmbH
Publication of EP3802171A1 publication Critical patent/EP3802171A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
    • B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
    • B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
    • B60G21/055—Stabiliser bars
    • 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
    • B60G2202/135—Stabiliser bar and/or tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/40—Constructional features of dampers and/or springs
    • B60G2206/42—Springs
    • B60G2206/427—Stabiliser bars or tubes
    • 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 is directed to a stabilizer bar for a vehicle and to a method for producing such a stabilizer bar.
  • the middle section of the stabilizer bar is reinforced with fibers oriented between -P/-35 degrees and -P/-55 degrees relative to the longitudinal axis and the end members that are primarily bending- loaded are reinforced with fibers oriented between +/-20 degrees and +/-40 de- grees relative to the longitudinal axis. In the transitional areas between the middle section and the end members there are transitions between these fiber orientations relatively to the longitudinal axis.
  • US 201 5/01 15560 A1 was published on 30.04.201 5 on behalf of Dr. Ing. h.c. F. Porsche Aktiengesellschaft and shows a fiber composite component and method for producing a fiber composite component.
  • the document discloses a fiber com posite torsion-bar stabilizer for a motor vehicle that has an elongate main body which has a plurality of tubular layers which are each formed from fibrous threads and casting resin.
  • the tubular layers are arranged in one another in the radial direc tion of the main body, and the fibrous threads of the different layers are each ori- ented at different angles relative to a longitudinal direction of the main body.
  • Ac cording to said document the fibrous threads are braided together in order to form the different layers.
  • WO 2014/161 791 A1 was published on 09.1 0.201 4 on behalf of Mubea Carbo Tech GmbH (the same applicant as the application at hand) and discloses a hybrid spring device that comprises an outer tubular shell.
  • the hybrid spring device further comprises an inner part enclosed in the outer tubular shell which comprises a fiber reinforced plastic material.
  • the outer tubular shell is de signed as self-supporting part made from a metallic material.
  • the document dis closes that a spring device may have the shape of a torsion rod (stabilizer) of an automotive torsion spring axle.
  • Stabilizer bars are in inter alia used in order to reduce body roll of vehicles during cornering. Thus, they improve steering performance and hence travelling comfort and driving safety.
  • Most stabilizer bars have essentially a U-shape comprising a first and a second arm interconnected by a back that acts as a torsional spring.
  • many stabilizer bars are not perfectly planar but have a spatially highly curved shape in order to avoid other components of a vehicle, such as the chassis or exhaust system.
  • stress and strain distribution becomes complex and therefore typically relatively large bars (respectively tubes with high wall thickness) have to be used in order to prevent local supercritical stress and strain.
  • a stabilizer bar for a vehicle typically comprises a composite mem ber made from a composite material which has a torsion spring portion comprising a first end region and a second end region.
  • the stabilizer bar typically also com prises a first arm portion bent away from the first end region of the torsion spring portion and comprising a first end portion.
  • the stabilizer bar typically also com prises a second arm portion bent away from the second end region of the torsion spring portion and comprising a second end portion.
  • at least one reinforcing member made at least partially from a metallic material is me chanically interconnected with the composite member and extends along a limited portion of the composite member to locally reinforce the composite member.
  • a stabilizer bar can be obtained which has a low and equally distributed weight if compared to conventional stabilizer bars made e.g. from spring steel.
  • a stabilizer bar having a specified spring characteristics can be easily obtained.
  • a stabilizer bar according to the present inven tion is less prone to local thermal loading (e.g. due to the exhaust system) due to the combination of composite and metallic material. The same holds true for local mechanical damage due to mechanical impacts (e.g. road stones etc. ) if compared to stabilizer bars made solely from composite materials.
  • a stabilizer bar according to the invention can be produced using highly automated methods as well as a high degree of material utilization can be obtained as will be explained in more detail below.
  • the reinforcing members can be integrated in the manufacturing process and thus no additional joining (prolongeds) in post-processing is needed. All this allows to obtain economical stabilizer bars.
  • fatigue behavior can be improved and service strength be increased without high additional weight.
  • the reinforcing member locally increases the torsional stiffness and/or bending stiffness of the composite member.
  • local and global stiffness of the stabilizer bar, respectively mechanical performance can be adjusted to meet certain reguirements e.g. regarding mechanical behavior and weight.
  • the composite member is at least par- tially made from a fiber-reinforced plastic.
  • Different types of fiber-reinforced plas tics may be applied, such as layers of braided fibers, woven fibers, wound fibers or combinations thereof.
  • long fibers may be advantageous.
  • Vari ous types of fibers may be used, such as carbon fibers, glass fibers, aramid fibers, mineral fibers and combinations thereof.
  • the invention is not limited to these types of fibers, respectively fabrics.
  • the composite member comprises multiple layers of reinforcing fibers, in particular if layers of reinforcing fibers are arranged super imposed and essentially concentrically about the center axis of the stabilizer bar or composite member.
  • a highly versatile type of stabilizer may be obtained if between 6 and 8 layers of fibers are superimposed.
  • a first group of fibers having a first Young's modulus is arranged at a first distance from the center axis of the stabilizer bar and a second group of fibers having a second Young's modulus is arranged at a second distance from the center axis of the stabilizer bar, the sec- ond distance being greater than the first distance and the first Young's modulus being greater than the second Young's modulus.
  • the first and the second group of fibers may be layers of reinforcing fibers, in par ticular layers of reinforcing fibers arranged essentially concentrically about the cen ter axis of the stabilizer bar (or composite member). Particularly good results may be obtained if at least some of the layers of fibers are braided layers of fibers. Hence, the composite member may at least partially be produced using over-braiding lay- ers of fibers.
  • the first Young's modulus is greater than about 250 GPa (gigapascal or N/mm 2 ) and the second Young's modulus is less than about 250 GPa (gigapascal or N/mm 2 ). It turned out that in particular (but not only) for composite members comprising superimposed layers of braided reinforcing fibers, the herein described arrangement/composition of reinforcing fi bers having different Young's modules typically allows to reduce the total number of superimposed layers of reinforcing fibers.
  • the at least one reinforcing member may e.g. be made from a steel (particularly a spring steel), an aluminum, a titanium, a magnesium or combinations thereof.
  • steel, aluminum, magnesium and tita nium should be understood as meaning also their alloys.
  • a variation of a stabilizer bar that has a particularly high torsional stiffness at a low total weight may be obtained if the at least one reinforcing member comprises a tubular shell. It may comprise multiple tubular shells that may be mechanically in terconnected with each other. Particularly high torsional stiffness may be obtained if at least a portion of the tubular shell has an essentially circular cross-section.
  • At least a portion of the tubular shell may have an essen tially ellipsoidal cross-section.
  • the bending properties of the stabilizer bar may be improved as well as the transfer of torsional load between the composite mem ber and the reinforcing member can be increased.
  • at least a portion of the tubular shell may have an essentially polygonal cross-section.
  • the cross-section may e.g. be rectangular, pentagonal or hexagonal. However, also other types of cross sections may be used.
  • the reinforcing member comprises a plate, which may be curved in at least one direction.
  • the present invention is not limited to reinforcing members having a tubular shapes.
  • the wall thickness of at least a portion of the tubular shell may vary along the central axis of the stabilizer bar and/or in cir cumferential direction of the tubular shell.
  • stress and strain distribution in the stabilizer bar can easily be optimized.
  • a variation of a stabilizer bar having a partic ularly high durability and can produced particularly economically may be obtained if tailor rolled tubes (TRT) are applied.
  • the at least one reinforcing member is ar ranged in the transition area between first end region and the first arm portion and/or in the transition area between second end region and the second arm por tion.
  • highly durable stabilizer bars may be obtained.
  • the composite member comprises at least one layer of glass fibers arranged adjacent to the reinforcing member.
  • the two member can be electrochemically decoupled and thus galvanic corrosion can be prevented.
  • At least a part of the at least one reinforcing member is arranged on an outer surface of the composite member.
  • At least a part of the at least one reinforcing member is arranged embedded in the composite member, respectively embedded in compo- site material, such as fiber-reinforced plastic.
  • compo- site material such as fiber-reinforced plastic.
  • At least part of the at least one reinforcing member may be arranged on an inner surface of the composite member.
  • the composite member may have an inner hollow channel that extends at least partially along the stabilizer bar.
  • Such an inner channel may be void (respectively be filled with gas) or may also at least partially be filled, such as by a solid foam.
  • the at least one reinforcing member may have a closed profile.
  • at least a part of the reinforcing member may have an open profile.
  • the at least one reinforcing member comprises at least one resilient portion.
  • the resilient portion may comprise at least one chamfer and/or at least one opening (respectively perforation) and/or at least one incision and/or a local variation of the material.
  • the resilient region may e.g. be made from a completely different material or if may be from essentially the same material, but may e.g. have a different micro-structure such as induced by local soft anneal ing.
  • a resilient region may be advantageous in order to prevent stress concentration in the composite member, as will be explained in more detail below.
  • the resilient portion may be located at a boundary region of the reinforcing member.
  • load paths in the stabilizer bar can be op timized and potentially super-critical stress concentration in the stabilizer bar at the boundary regions of the reinforcing members can be prevented.
  • the at least one reinforcing member comprises at least one chamfer and/or rounding.
  • the chamfer may have an angle of between 1 0° and 45° (degrees).
  • At least one transition means is arranged at the in terstitial region between the boundary region of the reinforcing member and the composite member to reduce local stress concentration.
  • a transition means may comprise e.g. a beading of adhesive and/or a local reinforcement e.g. made from a fiber-reinforced plastic with at least one layer of reinforcing fibers.
  • the transition means may be arranged on an outer surface and/or an inner surface of the composite member.
  • the transition means may be an integral part of the composite member, as will be explained in more detail below.
  • the at least one reinforcing member comprises at least one opening. It may also comprise multiple openings that may also be regarded as a perforation. Such at least one opening may be used in order to reduce the total weight of the stabilizer bar. As well, the at least one opening may be used in order to obtain a desired stress and strain distribution in the reinforcing member and/or to control the stiffness of the reinforcing member. Alternatively or in addition, the at least one reinforcing member may comprise at least one incision. Alternatively or in addition, it may also comprise a groove and/or a thin area, respectively an area with decreased wall thickness. Thus, not only the mechanical characteristics can be designed but also total weight of the stabilizer bar can be reduced.
  • the at least one reinforcing member may comprise several different wall thick nesses.
  • the wall thickness may be adapted to the distribution of forces.
  • such an at least one reinforcing member may be obtained using tailor rolled tubes (aka TRT).
  • At least a portion of the reinforcing member is coated with an adhesion promoter (e.g. coupling agent and/or primer) to increase the chemical and/or mechanical interconnection with the composite member.
  • an adhesion promoter e.g. coupling agent and/or primer
  • at least a portion of the reinforcing member may be rough ened and/or threatened with electrophoretic deposition which may also be used in order to prevent electrochemical corrosion.
  • the reinforcing member may be arranged to prevent or at least decrease mechanical and/or chemical interconnec- tion with the composite member.
  • it e.g. may be coated with a nonstick agent.
  • at least a portion of the reinforcing member is coated with an anti-corrosive material.
  • salt corrosion may be prevented effi ciently.
  • the at least one reinforcing member may be at least partially coated by a polymeric material, in particular with a non-conducting polymeric material.
  • the coating may also be made from another material suited to obtain at least one of the effects stated herein - e.g. a ceramic or a glass. Good results may be obtained if the at least one reinforcing member is fully coated by a polymeric ma- terial.
  • a coating with a polymeric material may also help to prevent intrusion and accumulation of corrosion-enhancing substances in the region between the com posite member and the reinforcing member.
  • At least a portion of the outer surface of the stabilizer bar are coated with a protective coating, e.g. an anti-corrosive material.
  • a protective coating e.g. an anti-corrosive material.
  • a protective coating may also include or be a heat shielding coating, such as a ceramic.
  • the at least one reinforcing member constitute at least part of a core structure (e.g. braiding core structure) of the stabilizer bar that may be wound by fibers of the composite member.
  • the sta bilizer bar may comprise a core structure that may comprise a foam material, such as a solid braiding foam.
  • the core structure may be at least partially be removed from the stabilizer bar (e.g. by dissolving) after production of the composite mem- ber in order to reduce total weight of the stabilizer bar.
  • the at least one reinforcing member may comprise a mounting portion that may be configured to be interconnected with a stabilizer mounting bush of a vehicle.
  • a highly durable mounting of the stabilizer bar can be obtained.
  • the at least one reinforcing member may also be used in order to mount other types of components, such as auxiliary components like sensors.
  • auxiliary components like sensors.
  • the present invention is further directed to providing a method for producing of a stabilizer bar.
  • a method for producing of a stabilizer bar typically comprises the method steps of: a) providing a core structure, which may e.g. be a braiding core; b) adding at least one layer of reinforcing fibers having a predefined orientation on the core structure until a com posite member with a specified layup (layer structure) is obtained; c) providing at least one reinforcing member made at least partially from a metallic material; d) arranging the at least one reinforcing member such that it is at a specified location of the stabilizer bar to be produced and adjacent to at least one layer of reinforcing fibers to be laid; e) interconnecting the composite member with the at least one reinforcing member.
  • method step d) is performed prior to method step b).
  • a variation of a stabilizer bar in which at least one reinforcing member is arranged adjacent to a central canal may be ob tained.
  • a central canal may be void or may at least partially be filled with e.g. a core structure, such as a solid foam and/or a resin.
  • step d) is performed after method step b).
  • a variation of a stabilizer bar in which at least one reinforcing member is at least partially embedded in the composite mem ber and/or is arranged at least partially on an outer surface of the composite mem- ber can be obtained.
  • At least one addi tional reinforcing member made at least partially from a metallic material is ar- ranged at the same time and/or subseguently to method step b).
  • the core structure provided in method step a) comprises at least one reinforcing member made at least partially from a metallic material.
  • a variation of the method according to the present invention further comprises the method step of removing at least part of the core structure after method step b). Part of the core structure may be removed after hardening of the composite mem ber.
  • the layers of fibers are applied using a winding process and/or a braiding process.
  • the composite member is hardened and subseguently at least one reinforcing member made at least partially from a metallic material is applied on an outer surface of the hardened composite member.
  • Fig. 1 schematically shows a variation of a stabilizer bar in a perspective view from above;
  • Fig. 2 schematically shows the stabilizer bar of Fig. 1 in a top view
  • Fig. 3 schematically shows cross-section AA of Fig. 2;
  • Fig. 4 schematically shows a cross-section of a second variation of a stabilizer bar according to the invention
  • Fig. 5 schematically shows a cross-section of a third variation of a stabilizer bar according to the invention
  • Fig. 6 schematically shows a cross-section of a fourth variation of a stabilizer bar according to the invention
  • Fig. 7 schematically shows a cross-section (parallel to center axis Ay) of a fifth variation of a stabilizer bar according to the invention
  • Fig. 8A shows Detail D of Fig. 7;
  • Fig. 8B shows Detail D according to Fig. 7 of a sixth variation of a stabilizer bar according to the invention
  • Fig. 9 schematically shows a cross-section (parallel to center axis Ay) of a sev enth variation of a stabilizer bar according to the invention
  • Fig. 1 0 shows Detail E of Fig. 9;
  • Fig. 1 1 schematically shows a cross-section (parallel to center axis Ay) of a sev enth variation of a stabilizer bar according to the invention
  • Fig. 1 2 schematically shows part of an eight variation of a stabilizer bar accord ing to the present invention in a perspective view from above;
  • Fig. 1 3 schematically shows a variation of a reinforcing member according
  • Fig. 1 4 schematically shows another variation of a reinforcing member accord ing
  • Fig. 1 5 schematically shows another variation of a reinforcing member accord ing
  • Fig. 1 6 schematically shows another variation of a reinforcing member accord ing
  • Fig- 1 to Fig. 3 schematically show a first variation of a stabilizer bar 1 for a vehicle according to the present invention.
  • the stabilizer bar 1 comprises a composite member 1 00 made from a composite material which in this variation is a fiber-re- inforced plastic.
  • the composite member 1 00 comprises a torsion spring portion 1 1 0 which has a first end region 1 1 1 and a second end region 1 1 2.
  • the composite member 1 00 further comprises a first arm portion 1 20 bent away from the first end region 1 1 1 of the torsion spring portion 1 1 0, the first arm portion 1 20 com prising a first end portion 1 21 at which a connecting 300 to be interconnected e.g. to a wheel suspension is arranged.
  • the composite member 1 00 further comprises a second arm portion 1 30 bent away from the second end region 1 1 2 of the tor sion spring portion 1 1 0, the second arm portion 1 30 comprising a second end portion 1 31 .
  • the composite member may be an integral structure or may be made from multiple components.
  • the vari- ation of a stabilizer bar 1 00 schematically shown in Fig .1 to Fig. 3 further com prises two tubular reinforcing members 200 that are made from a spring steel and that are mechanically interconnected with the composite member 200 and both extend along limited portions of the composite member 1 00 to locally reinforce the composite member 1 00.
  • the two reinforcing members 200 are arranged in the transition area between first end region 1 1 1 and the first arm portion 1 20 respectively in the transition area be- tween second end region 1 1 2 and the second arm portion 1 30. They are config ured and arranged in order to locally increase the torsional stiffness and bending stiffness of the composite member 1 00. Both reinforcing members 200 are ar ranged on an outer surface 1 40 of the composite member 1 00, as illustrated in Fig. 3. Thus the total torsional stiffness of the stabilizer bar 1 can increased particularly efficiently.
  • Fig. 4 schematically shows a variation of the stabilizer bar 1 where a reinforcing member 200 is arranged on an inner surface 1 50 of the composite member 1 00.
  • a variation of a stabilizer bar may be particularly durable as corrosion of the metallic reinforcing member 200 can be minimized.
  • This variation further com- prises an inner channel 1 60 that is void, respectively filled with a gas and conse- guently has a particularly low weight.
  • Fig. 5 schematically shows a variation of a stabilizer bar 1 similar to the variation shown in Fig. 4.
  • the inner channel 1 60 is filled with a core structure 400 made from a solid foam.
  • Fig. 6 schematically shows a variation of a stabilizer bar 1 in which the reinforcing member 200 is arranged embedded in the composite member 1 00 and hence is particularly well protected against corrosion.
  • Fig. 7 schematically shows a cross-sectional view parallel to a center axis Ay of a portion of a variation of a stabilizer bar 1 .
  • the stabilizer bar 1 comprises a reinforc ing member 200 that has a tubular shell 21 0 which has an essentially circular cross section and is arranged on an outer surface 1 40 of a composite member 1 00 hav ing a tubular shape as well.
  • the reinforcing member 200 comprises a resilient portion 220 located at a boundary region of the reinforcing member 200.
  • the reinforcing member 200 has a certain wall thickness D2 which decreases at the resilient portion 220 due to a chamfer 221 with an angle a (alpha).
  • the composite member 1 00 has a wall thickness D 1 which is constant at this region of the stabilizer bar 1 . Due to the decrease of wall thickness D 1 , super- critical stress concentration in the composite member 1 00 can be prevented.
  • Fig. 8B schematically shows a detail analogous to detail D of Fig. 7 of another var iation of a stabilizer bar 1 in which a first and a second transition means 500, 501 are arranged at the interstitial region between the boundary region of the reinforc ing member 200 and the composite member 1 00 to reduce local stress concentra- tion.
  • the first transition means 500 comprises an annular beading of an adhesive agent that is arranged on the outer surface 1 40 of the composite member 1 00 and extends to a resilient portion 220 of the reinforcing member 1 00.
  • the second tran sition means 501 is arranged on the inner surface of the composite member 1 00 and comprises a fiber-reinforced plastic with multiple layers of reinforcing fibers.
  • the second reinforcing means 501 is an integral part of the composite member 200.
  • Fig. 9 and Fig. 10 schematically show a variation of a stabilizer bar 1 according to the present invention in which a reinforcing member 200 is embedded in the com posite member 1 00.
  • the reinforcing member 200 also com prises a resilient portion 220 having a chamfer 221 that is designed in order to prevent supercritical stress concentration in the surrounding composite member 1 00, including both supercritical stress in the fibers as well as inter-laminar stress that else may cause delamination of the composite member 1 00.
  • Fig. 1 1 schematically shows a variation of a stabilizer bar 1 according to the present invention in which a first reinforcing member 200 arranged on an outer surface 1 40 of the in the composite member 1 00 and a second reinforcing member 201 arranged on an inner surface 1 50 of the in the composite member 1 00.
  • the first reinforcing member 200 comprises a mounting portion (224) configured to be interconnected with a stabilizer mounting bush (not shown) of a vehicle.
  • the variation of a mounting portion 224 shown in Fig. 1 1 comprises a cir- cumferential groove.
  • Fig. 1 2 schematically shows a variation of a stabilizer bar 1 according to the present invention in which a first reinforcing member 200 is formed like a tubular shell, however is not completely rotationally symmetric but has angularly cut ends in or der to obtain a certain stress and strain distribution in the stabilizer bar 1 .
  • FIG. 1 3 schematically shows a variation of a reinforcing member 200 that com prises a tubular shell 21 0 which has at its two boundary regions two resilient por tions 220 comprising multiple openings 222 forming a perforation with a lower torsional stiffness.
  • the openings at the same time allow intrusion of resin of the composite member and hence to increase local load transfer between the composite member and the reinforcing member 200 having at this region a lower torsional stiffness).
  • torsional stiffness of the reinforcing member 200 is reduced in these resilient por tions 220, stress and strain distribution in the composite member can be optimized very efficiently.
  • FIG. 14 schematically shows a variation of a reinforcing member 200 that com prises a tubular shell 21 0 which has at its two boundary regions two resilient por tions 220 comprising multiple incisions 223 evenly distributed circumferentially about the tubular shell 21 0.
  • a non -even distribution may be cho sen to obtain a certain stress distribution when interconnected with a composite member.
  • Fig. 1 5 schematically shows another variation of a reinforcing member 200 that comprises a tubular shell 21 0 having three resilient portions 220 embodied in dif ferent ways.
  • a first resilient portion 220 arranged at a first boundary region of the reinforcing member 200 comprises multiple openings/bores that form a perfora- tion 222.
  • a second resilient portion 220 arranged at a second boundary region of the reinforcing member 200 comprises a chamfer 221 and a third resilient region arranged in between comprises an annealed portion 225 which has been annealed in order to obtain a softer microstructure.
  • Fig. 16 schematically shows a reinforcing member 200 which comprises a tubular shell 21 0 that has an essentially open profile due to a longitudinal incision 223.
  • a reinforcing member 200 will typically have a lower torsional stiffness than variations with essentially closed profiles (as described above) which may help to obtain a specified stress and strain distribution in a stabilizer bar (not shown) as well as it may be arranged at a composite member 1 00 after at least part of the resin of this composite member has already hardened.
  • Torsion spring portion 501 Second transition means 111 First end region Ay Center axis

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

Abstract

L'invention concerne une barre stabilisatrice (1) pour un véhicule comprenant un élément composite (100) constitué d'un matériau composite. L'élément composite (100) comprend une partie ressort de torsion (110) présentant une première région d'extrémité (111) et une seconde région d'extrémité (112). L'élément composite (100) comprend en outre une première partie bras (120) pliée à l'opposé de la première région d'extrémité (111) de la partie ressort de torsion (110) et la première partie bras (120) comprenant une première partie d'extrémité (121). L'élément composite (100) a en outre une seconde partie bras (130) pliée à l'opposé de la seconde région d'extrémité (112) de la partie ressort de torsion (110) et la seconde partie bras (130) comprenant une seconde partie d'extrémité (131). Selon l'invention, la barre stabilisatrice comprend au moins un élément de renfort (200) constitué au moins en partie d'un matériau métallique et qui est relié mécaniquement à l'élément composite (200) et s'étend sur une partie limitée de l'élément composite (100) pour renforcer localement l'élément composite (100).
EP19724169.8A 2018-05-24 2019-05-10 Barre stabilisatrice pour véhicule Withdrawn EP3802171A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6582018 2018-05-24
PCT/EP2019/062082 WO2019224021A1 (fr) 2018-05-24 2019-05-10 Barre stabilisatrice pour véhicule

Publications (1)

Publication Number Publication Date
EP3802171A1 true EP3802171A1 (fr) 2021-04-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19724169.8A Withdrawn EP3802171A1 (fr) 2018-05-24 2019-05-10 Barre stabilisatrice pour véhicule

Country Status (2)

Country Link
EP (1) EP3802171A1 (fr)
WO (1) WO2019224021A1 (fr)

Family Cites Families (12)

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FR2521919B1 (fr) * 1982-02-19 1986-01-03 Allevard Ind Sa Barres stabilisatrices allegees et renforcees avec butees transversales
DE3910641A1 (de) * 1989-04-01 1990-10-18 Boehler Ag Stabilisatoranordnung fuer fahrzeuge und herstellungsverfahren
DE10231013A1 (de) * 2002-07-09 2004-02-05 ZF Lemförder Metallwaren AG Stabilisator für Kraftfahrzeuge
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