WO2008125076A1 - Ressort à lame constitué d'un matériau composite fibres-matière plastique et élément d'application d'une force pour ce ressort - Google Patents

Ressort à lame constitué d'un matériau composite fibres-matière plastique et élément d'application d'une force pour ce ressort Download PDF

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Publication number
WO2008125076A1
WO2008125076A1 PCT/DE2008/000511 DE2008000511W WO2008125076A1 WO 2008125076 A1 WO2008125076 A1 WO 2008125076A1 DE 2008000511 W DE2008000511 W DE 2008000511W WO 2008125076 A1 WO2008125076 A1 WO 2008125076A1
Authority
WO
WIPO (PCT)
Prior art keywords
leaf spring
force introduction
introduction element
fibers
plastic
Prior art date
Application number
PCT/DE2008/000511
Other languages
German (de)
English (en)
Inventor
Matthias Voigt
Heiko Kempe
Andreas Schult
Original Assignee
Ifc Composite 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 Ifc Composite Gmbh filed Critical Ifc Composite Gmbh
Publication of WO2008125076A1 publication Critical patent/WO2008125076A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
    • F16F1/368—Leaf springs
    • F16F1/3683—Attachments or mountings therefor
    • 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
    • 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

  • Leaf spring made of a fiber-plastic composite material and force introduction element for the same
  • the invention relates to a leaf spring made of a fiber-plastic composite material in which the fibers extend unabridged from an axial end of the leaf spring to its other end and are embedded in a plastic, and a force introduction element for this leaf spring.
  • a leaf spring with such a fiber profile is known for example from DE 10 2004 010 768 A1.
  • this has to fulfill its intended use on a medium force application area and two other force application areas at their axial ends.
  • These force introduction areas are used for fastening the leaf spring by means of separate fastening elements on the vehicle structure or on chassis components, so as to enable a cushioning of the same.
  • the end-side force introduction regions are immovably articulated by means of the fastening elements to the components assigned to them, it can not be ruled out to date that the central fastening region performs an undesired axial movement during deflection. This can lead to damage of the leaf spring structure, since the curved leaf spring is usually encompassed and fixed in this central force introduction region of metallic and half-shell fasteners.
  • EP 0 425 880 A1 proposes to arrange an intermediate layer between the metallic force introduction element and the spring body, which consists of a castable and hardening plastic.
  • the spring body is protected by the introduction of a protective layer between the same and the metallic fastener, but the production of such a fastening arrangement is judged to be very expensive and therefore expensive.
  • the invention has for its object to introduce a leaf spring made of a fiber-plastic composite material, which is formed in its central mounting portion such that a damage-free connection with a relevant force introduction element is possible for this.
  • the leaf spring should not have separations of individual fibers in order to let them run unabridged from one to the other axial end thereof.
  • this performs no axial movement in their use in their middle attachment portion.
  • the invention is based on the finding that receiving areas for a force introduction element can be created by a corresponding shaping of the leaf spring during their manufacture, into which components of this force introduction element can be positively and non-positively inserted.
  • This form and frictional connection between the leaf spring and the force introduction element allows a safe and distributed over a relatively large area force introduction into the leaf spring. Therefore, the mechanical stress of the leaf spring in the direction of its longitudinal extent during their use, on the one hand low, on the other hand, an axial movement of the leaf spring due to the positive and non-positive latching between said components is reliably avoided.
  • the invention initially relates to a leaf spring made of a fiber-plastic composite material in which the fibers extend unabridged from one axial end of the leaf spring to its other end and are embedded in a plastic.
  • the leaf spring in the region of a central mounting portion perpendicular to its longitudinal axis has at least one constriction into which a component of a force introduction element is positively and non-positively insertable.
  • the leaf spring in the area of the central fastening section, it has at least one bulge perpendicular to its longitudinal axis and perpendicular to the at least one constriction onto which a component of the force introduction element can be placed positively and non-positively.
  • the leaf spring allows that it can be gripped on this side form-fitting and non-positively by components of the force introduction element, wherein can be exercised on both sides of this component of the force introduction element, a leaf spring further fixing surface pressure.
  • the leaf spring has two opposite constrictions and two opposite bulges in their cross-sectional profile.
  • the constrictions are formed in those surfaces of the leaf spring whose surface normal are aligned substantially horizontally after installation of the leaf spring in a vehicle, and that the bulges are formed in those surfaces of the leaf spring whose surface normal in the installed state of the leaf spring are aligned substantially vertically.
  • the fiber volume of those fibers and the plastic volume of that plastic, which were displaced in the shaping of the leaf spring from the region of at least one constriction, arranged in the region of at least one bulge are.
  • a value of 5% to 15% of the width of the leaf spring is considered to be sufficient. tet to ensure the desired positive connection between the leaf spring and the central force introduction element.
  • the height of the at least one bulge preferably results from the material volume of the spring body displaced in the region of the constrictions and the axial length of the bulge.
  • a value for the height of the bulge of 10% to 20% of the total height of the leaf spring in the region of this bulge has proven to be advantageous in a particular design. If two opposing bulges are formed on the leaf spring, the height of each bulge will be between 5% and 10% of the total height of the leaf spring in the region of these bulges.
  • the axial length of the constrictions and the bulges is preferably approximately identical.
  • unidirectionally oriented synthetic fibers or synthetic fiber fabric are preferred, wherein the fibers are formed for example as glass fibers or carbon fibers, while as plastic an epoxy resin matrix or a thermoplastic matrix is preferred.
  • the leaf spring according to the invention is particularly suitable for installation in a motor vehicle and has, in addition to the central force introduction section at its axial ends in each case a further force introduction section.
  • the invention also relates to a force introduction element for a fiber composite leaf spring, which is formed at least in accordance with some of the described fiction, related features.
  • the force introduction element is designed in several parts, wherein at least a first fastening element for positive and non-positive engagement in the at least one recess of the leaf spring is formed, while at least a second Fastening element is formed for resting on the at least one bulge of the leaf spring.
  • the fastening elements of the force introduction element are designed to be connectable to one another.
  • the connection of the individual fastening elements is preferably carried out by means of screws.
  • the first fastening elements are designed as angle pieces, with at least one leg engaging in the recess of the leaf spring, and with at least one leg engaging over the width of the leaf spring.
  • first fastening elements are formed as in cross-section L-shaped elbows or as U-shaped in cross-angle pieces.
  • said second fastening elements are plate-shaped in cross-section or U-shaped angle pieces.
  • FIG. 1 is a schematic plan view of a leaf spring according to the invention with an indicated fiber profile, in the lateral constrictions fasteners of a force introduction element are inserted,
  • FIG. 2 is a side view A of the leaf spring of FIG. 1, in which a bulge of the same is recognizable
  • 3 is another side view of a leaf spring with two bulges and a force introduction element with two in cross-section U-shaped fasteners
  • Fig. 4 shows a cross section BB through the leaf spring assembly of FIG. 2, but in the screwed state
  • FIG. 5 shows a cross section CC through the leaf spring arrangement according to FIG. 3.
  • the leaf spring 1 is shown in Fig. 1 such that is looked at that side, which points at installation in a vehicle downwards or upwards, which is why the surface normal is oriented substantially vertically in the vehicle.
  • Figures 2 and 3 show a leaf spring V, 1 "from that long side, the surface normal is aligned horizontally after installation of the leaf spring in a vehicle.
  • Fig. 1 shows schematically a fiber composite leaf spring 1, the fibers 2 extend over the entire axial length thereof unabridged or not interrupted. This guarantees a very high load capacity of the leaf spring with relatively small dimensions.
  • this was preferably formed by horizontal deposition of individual prepreg layers in a mold so that in a central mounting portion 20 of the same two constrictions 15, 16 are formed in the cross-sectional profile, the shape of the fibers 2 uninjured follow.
  • the two constrictions 15 and 16 lace the leaf spring 1 in a direction perpendicular to the longitudinal axis 19 of the same, wherein the axial ends of the constrictions 15, 16 axially terminate at such an angle, which deviates from a right angle.
  • the depth t of the constrictions 15, 16 is in each case about 5% to 15% of the leaf spring width b.
  • the height h is about 10% to 20% of the total height H of the leaf spring 1, 1 '
  • the bulge 3 rises on the leaf spring 1, 1', 1 "in a direction that is aligned perpendicular to the longitudinal axis 19 and perpendicular to the constrictions 15, 16.
  • the two fastening elements 5, 6 designed as angle pieces are firmly connectable to a further fastening element 10 of the force introduction element 21, which is arranged on the upper side of the bulge 3.
  • a further fastening element 10 of the force introduction element 21 which is arranged on the upper side of the bulge 3.
  • introduced holes 8, 9, 11, 12 with screw thread allow screwing and tightening screws 17 and 18, so that the fasteners 5, 6, 10 are captively connected to each other and the force introduction element 21 after its connection with a stationary vehicle component, the leaf spring 1, 1 'axially immovable clamps.
  • the leaf spring 1 "shown in Fig. 3 has substantially the same structure and the same geometry as the leaf springs 1, 1 'according to Figures 1 and 2. However, it has two bulges 3 and 4, whose total volume corresponds to that volume, which the formation of the two constrictions 15 and 16 has been displaced at these points in the spring body. that is.
  • the clamping of this leaf spring 1 "in its central mounting portion 20, however, takes place with a force introduction element 22, which is composed of two substantially U-shaped fastening elements 13 and 14, held together by means of threaded holes 8, 9, 11, 12 screws 17, 18
  • a screw bolt 23 welded to the upper U-shaped fastening element 13 is used.
  • FIGS. 4 and 5 show schematic cross-sectional views of the leaf springs 1 'and 1 "in the sectional planes BB and CC of FIGS. 2 and 3.
  • the vertical limbs of the fastening elements 5, 6 designed as angle pieces grip or 13, 14 in the constrictions 15 and 16 of the leaf springs V and 1 "a form-fitting. While in the leaf spring 1 'according to FIG.
  • the only one, the upper bulge 3 is covered by a plate-shaped fastening element 10 of the force introduction element 21, the two fastening elements 13 and 14 of the force introduction element 22 are formed substantially U-shaped, as shown in FIG whose longer, upper and lower legs rest on the respectively associated bulges 3 and 4, respectively, and whose short legs engage positively and non-positively in the constrictions 15, 16 of the leaf springs 1 ', 1 ".
  • the U-shaped force introduction elements are formed so that they are laterally inserted into the two constrictions 15, 16 of the leaf spring 1 and connected to each other, as for the embodiment of the L-shaped angle pieces 5, 6 in Fig. 1 is shown.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)

Abstract

L'invention concerne un ressort à lame (1, 1', 1') constitué d'un matériau composite fibres-matière plastique dans lequel les fibres (2) s'étendent sans être raccourcies d'une extrémité axiale du ressort à lame jusqu'à son autre extrémité et sont incorporées dans une matière plastique. Selon l'invention, pour pouvoir exclure d'une part des mouvements axiaux du ressort à lame lorsqu'il est monté sur un véhicule, et obtenir d'autre part une structure intacte dans le ressort à lame, ledit ressort à lame (1, 1', 1') présente au moins un rétrécissement (15, 16) perpendiculairement à son axe longitudinal (19) dans la zone d'une section de fixation intermédiaire (20), rétrécissement dans lequel un élément (21, 22) d'application d'une force peut être introduit par complémentarité de forme et à force. L'invention concerne aussi un élément (21, 22) d'application de force destiné à retenir un tel ressort à lame (1, 1', 1").
PCT/DE2008/000511 2007-04-14 2008-03-27 Ressort à lame constitué d'un matériau composite fibres-matière plastique et élément d'application d'une force pour ce ressort WO2008125076A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007017991.1A DE102007017991B4 (de) 2007-04-14 2007-04-14 Blattfeder aus einem Faser-Kunststoff-Verbundwerkstoff und Krafteinleitungselement für dieselbe
DE102007017991.1 2007-04-14

Publications (1)

Publication Number Publication Date
WO2008125076A1 true WO2008125076A1 (fr) 2008-10-23

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PCT/DE2008/000511 WO2008125076A1 (fr) 2007-04-14 2008-03-27 Ressort à lame constitué d'un matériau composite fibres-matière plastique et élément d'application d'une force pour ce ressort

Country Status (2)

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DE (1) DE102007017991B4 (fr)
WO (1) WO2008125076A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011023549A1 (fr) 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Dispositif palier pour un ressort à lames transversal pouvant être monté dans la zone d'un essieu d'un véhicule
WO2011023548A1 (fr) * 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Système de coussinet d'un ressort à lames transversal
WO2011023547A1 (fr) 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Système de coussinet pour un ressort à lames transversal, pouvant être monté au niveau d'un essieu de véhicule
WO2011023545A1 (fr) * 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Système de coussinet d'un ressort à lames transversal
US8444163B2 (en) 2009-08-26 2013-05-21 Zf Friedrichshafen Ag Bearing mechanism for a transverse leaf spring
WO2017207801A1 (fr) * 2016-06-02 2017-12-07 Muhr Und Bender Kg Ensemble ressort à lames et ressort à lames
CN108506396A (zh) * 2018-04-28 2018-09-07 安徽江淮汽车集团股份有限公司 一种等截面叶片主副簧总成

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012101730A1 (de) 2012-03-01 2013-09-05 Benteler Automobiltechnik Gmbh Kraftfahrzeugachsaufhängung mit Längsblattfeder
DE102014005978A1 (de) 2014-04-24 2014-09-25 Daimler Ag Aus einem Faserverbundwerkstoff bestehende Blattfeder und ein Kraftfahrzeug

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115696A2 (fr) * 1983-01-05 1984-08-15 Ford Motor Company Limited Dispositif de fixation sur l'essieu pour ressorts à lames en matière synthétique renforcée de fibres
EP0147077A2 (fr) * 1983-12-27 1985-07-03 Ford Motor Company Limited Ressort à lame en matière composite à fibres enroulées
JPS63251638A (ja) * 1987-04-06 1988-10-19 Nhk Spring Co Ltd Ｆｒｐ板ばね装置

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AT27577B (de) 1906-03-06 1907-02-25 Christian Krautheim Messerputzmaschine.
US3376033A (en) * 1966-05-02 1968-04-02 Gen Motors Corp Unitized composite spring construction
BR8203375A (pt) * 1981-06-15 1983-05-31 Budd Co Folha de mola para suspensao de estruturas recipocas e processo de sua fabricacao
DE3532297C1 (de) * 1985-09-11 1987-04-23 Arbed Techno Gmbh Faserverstaerkte Kunststoff-Blattfeder
AT390655B (de) * 1986-02-18 1990-06-11 Isosport Verbundbauteile Insbesondere zur mitteneinspannung geeignete einspannvorrichtung fuer eine blattfeder aus faserverstaerktem kunststoff
DE3904532A1 (de) * 1989-02-15 1990-08-16 Basf Ag Blattfeder aus nicht-metallischen werkstoffen
DE3935795A1 (de) * 1989-10-27 1991-05-02 Basf Ag Blattfeder aus faserverbundwerkstoff
US20030122293A1 (en) * 2001-12-27 2003-07-03 Visteon Global Technologies, Inc. Variable rate multi-arc composite leaf spring assembly
DE102004010768B4 (de) * 2004-03-05 2006-07-27 Ifc Composite Gmbh Blattfeder für eine Radaufhängung an einem Fahrzeug

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115696A2 (fr) * 1983-01-05 1984-08-15 Ford Motor Company Limited Dispositif de fixation sur l'essieu pour ressorts à lames en matière synthétique renforcée de fibres
EP0147077A2 (fr) * 1983-12-27 1985-07-03 Ford Motor Company Limited Ressort à lame en matière composite à fibres enroulées
JPS63251638A (ja) * 1987-04-06 1988-10-19 Nhk Spring Co Ltd Ｆｒｐ板ばね装置

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011023549A1 (fr) 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Dispositif palier pour un ressort à lames transversal pouvant être monté dans la zone d'un essieu d'un véhicule
WO2011023548A1 (fr) * 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Système de coussinet d'un ressort à lames transversal
WO2011023547A1 (fr) 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Système de coussinet pour un ressort à lames transversal, pouvant être monté au niveau d'un essieu de véhicule
DE102009028893A1 (de) 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Lagervorrichtung einer im Bereich einer Fahrzeugachse eines Fahrzeuges montierbaren Querblattfeder
DE102009028899A1 (de) 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Lagervorrichtung für eine Querblattfeder, die im Bereich einer Fahrzeugachse eines Fahrzeuges montierbar ist
WO2011023545A1 (fr) * 2009-08-26 2011-03-03 Zf Friedrichshafen Ag Système de coussinet d'un ressort à lames transversal
CN102481817A (zh) * 2009-08-26 2012-05-30 Zf腓德烈斯哈芬股份公司 横向板簧的支承装置
CN102498001A (zh) * 2009-08-26 2012-06-13 Zf腓德烈斯哈芬股份公司 横向板簧的支承装置
US8360454B2 (en) 2009-08-26 2013-01-29 Zf Friedrichshafen Ag Bearing mechanism for a transverse leaf spring
US8360453B2 (en) 2009-08-26 2013-01-29 Zf Friedrichshafen Ag Bearing mechanism for a transverse leaf spring
US8444162B2 (en) 2009-08-26 2013-05-21 Zf Friedrichshafen Ag Bearing mechanism for a transverse leaf spring, mountable in the area of a vehicle axle
US8444163B2 (en) 2009-08-26 2013-05-21 Zf Friedrichshafen Ag Bearing mechanism for a transverse leaf spring
US8459676B2 (en) 2009-08-26 2013-06-11 Zf Friedrichshafen Ag Bearing device of a transverse leaf spring that can be mounted in the region of a vehicle axle of a vehicle
CN102498001B (zh) * 2009-08-26 2015-07-08 Zf腓德烈斯哈芬股份公司 横向板簧的支承装置
WO2017207801A1 (fr) * 2016-06-02 2017-12-07 Muhr Und Bender Kg Ensemble ressort à lames et ressort à lames
CN108506396A (zh) * 2018-04-28 2018-09-07 安徽江淮汽车集团股份有限公司 一种等截面叶片主副簧总成
CN108506396B (zh) * 2018-04-28 2019-12-17 安徽江淮汽车集团股份有限公司 一种等截面叶片主副簧总成

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Publication number Publication date
DE102007017991B4 (de) 2016-02-25
DE102007017991A1 (de) 2008-10-30

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