EP1948958A1 - Blattfeder bestehend aus einem speziellen faserverbundwerkstoff - Google Patents
Blattfeder bestehend aus einem speziellen faserverbundwerkstoffInfo
- Publication number
- EP1948958A1 EP1948958A1 EP06818044A EP06818044A EP1948958A1 EP 1948958 A1 EP1948958 A1 EP 1948958A1 EP 06818044 A EP06818044 A EP 06818044A EP 06818044 A EP06818044 A EP 06818044A EP 1948958 A1 EP1948958 A1 EP 1948958A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leaf spring
- composite material
- fibre
- hexion
- resin
- 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- Withdrawn
Links
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
-
- 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
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0241—Fibre-reinforced plastics [FRP]
Definitions
- Leaf spring consisting of a special fiber composite material
- the invention relates to a leaf spring made of a fiber composite material according to the preamble of patent claim 1.
- Leaf springs are commonly used for suspensions on a vehicle to cushion it against uneven terrain conditions.
- Such vehicles may in particular be passenger cars, trucks and other commercial vehicles, but also rail vehicles and the like.
- Leaf springs made of steel have been known for a long time. In these individual, narrow steel sheets are superimposed with decreasing lengths to achieve a variable spring constant with increasing load. By clamping and / or screw the plates of the leaf springs are connected to form a package. When mounting a leaf spring in a motor vehicle, for example, this takes place transversely to the direction of travel, wherein the central region thereof is fixed to the vehicle body, while the two axial ends of the leaf spring in the region of the suspension of the right and left vehicle wheel are arranged.
- a metallic leaf spring is comparatively inexpensive to manufacture and reliable in operation, but such is disadvantageously difficult, which contributes to a relatively high vehicle weight and thus ultimately causes increased fuel consumption.
- leaf springs made of fiber composite materials, which are formed, for example, impregnated with synthetic resin glass or carbon fibers and have the same size and comparable spring properties considerably less weight than steel leaf springs.
- Such composite fiber leaf springs are produced, for example, from individual resin-impregnated fiber layers. These prepregs are manufactured and / or cut to the desired shape and placed one above the other in a mold that corresponds to the dimensions of the leaf spring, and then the green leaf spring in the mold under the influence of Hardened pressure and heat.
- a leaf spring made of a fiber composite material which consists of a central arc section and ends of peripheral sections in one piece.
- the peripheral portions have at their respective axial end an eyelet with an opening for receiving a bolt for the purpose of securing the leaf spring to the vehicle chassis.
- the disadvantage here is the introduction of the attachment eye in the leaf spring, which can only be realized by a structurally complex mold or by a severing the fibers punching process.
- the end portions are chamfered.
- the respective end section is cut to size after curing of the leaf spring of the bevelled shape. This has the consequence that also the fibers of the material are cut.
- the interfaces often lead to cracks, which emanate from the interfaces and extend substantially parallel to the longitudinal extent of the fibers at permanent alternating loads of the leaf spring. These cracks in turn can lead to breakage of the leaf spring.
- a leaf spring made of a fiber composite material which is narrower and thicker at its axial ends than in a central, rectangular section.
- the region of the axial ends of the leaf spring can be approximately trapezoidal in plan view.
- the area of rectangular cross sections of the leaf spring from one spring end to the other spring end may be constant according to another variant.
- the composite fibers are uncut from one to the other axial end.
- the geometry of the leaf spring is produced during its manufacture by compression molding.
- a leaf spring made of a fiber composite material having a central longitudinal portion and axial ends for a suspension on a vehicle in which the axial ends are formed with respect to the leaf spring width is tapered, and in the axially aligned fibers of the fiber composite material are uncut to the end edge of the leaf spring out.
- this leaf spring it is provided in this leaf spring that it is constructed of resin-impregnated fiber layers, which have in the manufacture of the leaf spring at its axial ends in a plan view of a V-shaped geometry or a V-shaped notch and thus two transverse to the longitudinal extent of the leaf spring forming trained thighs. These two legs are placed close together and hardened in the manufacturing process, so that the finished leaf spring is approximately trapezoidal in the region of its ends and has no material thickening in this area.
- the leaf spring can be reinforced in its central region by geometrically simple, rectangular fiber layers in terms of their component thickness, while being used to form the V-shaped axial ends of the leaf spring appropriately trained and guided over the entire component length fiber layers.
- a leaf spring according to DE 10 2004 010 768 A1 has several advantages, since it has substantially constant cross-sectional areas over almost its entire length and a constant thickness with reduced width at the axial end, without having to cut it at its axial ends. Finally, it is known from DE 41 06 658 A1 and DE 44 22 473 C2 that the fiber volume fraction in a fiber composite leaf spring with good technical properties is more than 50%, preferably 60% to 70%.
- the invention has the object to produce a leaf spring according to DE 10 2004 010 768 A1 from a fiber composite material having such a ratio of fibers and the still liquid workpiece component and such a mixing ratio of the components of the still liquid workpiece component that the Leaf spring technically simple and inexpensive to produce, and, for example, when used in a small commercial vehicle, such as a city delivery vehicle that can withstand during its operation occurring loads on the maximum life.
- the invention is based on a leaf spring made of a fiber composite material having a central longitudinal portion and two adjoining axial end portions for a suspension on a vehicle, wherein the end portions are tapered with respect to the leaf spring width, wherein the leaf spring is composed of resin-impregnated fiber layers, said axially aligned fibers of the fiber composite material extend unabridged to the axial ends of the leaf spring, and wherein the axial end portions before completion of the leaf spring have a substantially V-shaped geometry or a substantially V-shaped notch and thus axially two transverse to Form longitudinal extension of the leaf spring formed legs, said legs are close to each other in the finished leaf spring, and wherein the fiber volume fraction in the cured leaf spring is more than 50%.
- the fiber composite material of said leaf spring consists of: a) the EPR 05322 Hexion, b) the EPH 778 hardener Hexion c) the accelerator EPC 120 Hexion, and d) glass fibers of the type SE 1500 2400 tex AdvantexT30 from Owens Corning Fiberglass, wherein 0.012 kg to 0.018 kg of hardener and 0.003 kg to 0.007 kg of accelerator are mixed in the not yet hardened leaf spring to form the initially liquid workpiece component to a weight of 0.1 kg of synthetic resin.
- EPR 05322 resin has also become known as EPIKOTE TM Resin 05322 or BAKELITE® EPR 05322. It is a water-insoluble, modified epoxy resin with bisphenol A-epichlorohydrin resins MG ⁇ 700. The flash point of this synthetic resin is more than 200 ° C.
- the EPH 778 hardener has also become known as EPIKURE TM Curing Agent 778 or BAKELITE® EPH 778. It is a water-insoluble epoxy hardener with bisphenol A-epichlorohydrin resins MW ⁇ 700. The flash point of this hardener is more than 200 0 C. The vapor pressure at 20 ° C is less than 0.1 hPa, the density at 20 ° C. is about 1, 2 g / cm 3 .
- the EPC 120 accelerator has also become known as EPIKURE TM Catalyst 120 or BAKELITE® EPC 120. This is a water-insoluble epoxy hardener with bisphenol-A-epichloro- hydrinharze molecular weight ⁇ 700. The flash point of this accelerator is more than 200 0 C. The ignition temperature is more than 380 0 C. The density at 20 ° C is about 1.2 g / cm 3 .
- leaf springs produced in this way showed that their production is relatively inexpensive and easy to carry out.
- leaf springs hold all static and dynamic loads that typically occur during the life of a motor vehicle, especially a small commercial vehicle, such as in a city delivery vehicle with up to 7,500 kilograms gross vehicle weight.
- the first line of this table illustrates that the initially liquid constituents of the leaf spring according to the invention completely cure.
- a laminate produced according to the invention is characterized by a curing temperature of 85 ° C. with a minimum curing time of 10 hours.
- the glass fibers of type SE 1500 2400 tex AdvantexT30 from Owens Coming Fiberglas have the following material properties:
- the TEX number is 2400 ⁇ 8%, so that a 10 meter long roving unwound from a roll of these glass fibers weighs 2400 grams ⁇ 8%.
- the maximum tensile strength is 908 MPa and the elongation modulus is 73 GPa ⁇ 1.5 GPa.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510054334 DE102005054334A1 (de) | 2005-11-11 | 2005-11-11 | Blattfeder, bestehend aus einem speziellen Faserverbundwerkstoff |
PCT/DE2006/001940 WO2007054069A1 (de) | 2005-11-11 | 2006-11-04 | Blattfeder bestehend aus einem speziellen faserverbundwerkstoff |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1948958A1 true EP1948958A1 (de) | 2008-07-30 |
Family
ID=37807897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06818044A Withdrawn EP1948958A1 (de) | 2005-11-11 | 2006-11-04 | Blattfeder bestehend aus einem speziellen faserverbundwerkstoff |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1948958A1 (de) |
DE (2) | DE102005054334A1 (de) |
WO (1) | WO2007054069A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130248076A1 (en) * | 2012-03-26 | 2013-09-26 | Peter Johann Cornelius Maus | Bead structure for a pneumatic tire |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2829881A (en) * | 1957-02-13 | 1958-04-08 | Carrier Conveyor Corp | Vibratory spring of embedded filaments |
US3142598A (en) * | 1961-10-02 | 1964-07-28 | Pacific Plastics Company Inc | Method of making resin-impregnated glass fiber automobile leaf springs |
JPS5828454B2 (ja) * | 1980-11-04 | 1983-06-16 | 大日本インキ化学工業株式会社 | 耐疲労特性に優れる自動車用frp板ばね |
FR2516455B1 (fr) * | 1981-11-18 | 1986-12-12 | Bertin & Cie | Suspension de vehicule automobile par lame elastique |
CA1290533C (en) * | 1987-06-12 | 1991-10-15 | Eric Jyh Hong Chen | Composites |
DE4007346A1 (de) * | 1990-03-08 | 1991-09-12 | Basf Ag | Blattfedern aus faser/kunststoff-verbund |
DE4106658A1 (de) * | 1991-03-02 | 1992-09-03 | Basf Ag | Verfahren zur herstellung von formkoerpern aus mit fasermaterial verstaerkten kunstharzen |
BE1010823A3 (nl) * | 1996-12-24 | 1999-02-02 | Dsm Nv | Constructieveer van met vezels versterkte kunststof. |
AU746261B2 (en) * | 1997-04-17 | 2002-04-18 | Sealy Technology Llc | Composite material spring modules with integrally formed attachment fittings |
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 |
-
2005
- 2005-11-11 DE DE200510054334 patent/DE102005054334A1/de not_active Ceased
-
2006
- 2006-11-04 DE DE112006002663T patent/DE112006002663A5/de not_active Withdrawn
- 2006-11-04 WO PCT/DE2006/001940 patent/WO2007054069A1/de active Application Filing
- 2006-11-04 EP EP06818044A patent/EP1948958A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2007054069A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE112006002663A5 (de) | 2008-07-10 |
DE102005054334A1 (de) | 2007-05-24 |
WO2007054069A1 (de) | 2007-05-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20080606 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): FR |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): FR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: AULICH, CLEMENS Inventor name: FOERSTER, RAINER Inventor name: KEMPE, HEIKO |
|
17Q | First examination report despatched |
Effective date: 20091204 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20100415 |