GB2184403A - Plastics construction member for a motor vehicle - Google Patents

Plastics construction member for a motor vehicle Download PDF

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Publication number
GB2184403A
GB2184403A GB08619703A GB8619703A GB2184403A GB 2184403 A GB2184403 A GB 2184403A GB 08619703 A GB08619703 A GB 08619703A GB 8619703 A GB8619703 A GB 8619703A GB 2184403 A GB2184403 A GB 2184403A
Authority
GB
United Kingdom
Prior art keywords
construction member
plastics
skins
soft core
core
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Withdrawn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
GB08619703A
Other versions
GB8619703D0 (en
Inventor
Hans Vogt
Oskar Hurten
Erwin Spiegel
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.)
Ford Motor Co
Original Assignee
Ford Motor Co
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 Ford Motor Co filed Critical Ford Motor Co
Publication of GB8619703D0 publication Critical patent/GB8619703D0/en
Publication of GB2184403A publication Critical patent/GB2184403A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • B62D25/10—Bonnets or lids, e.g. for trucks, tractors, busses, work vehicles
    • B62D25/105—Bonnets or lids, e.g. for trucks, tractors, busses, work vehicles for motor cars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • B62D25/16—Mud-guards or wings; Wheel cover panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/234—Sheet including cover or casing including elements cooperating to form cells
    • Y10T428/236—Honeycomb type cells extend perpendicularly to nonthickness layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24149—Honeycomb-like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24826—Spot bonds connect components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987—With nonvoid component of specified composition
    • Y10T428/24999—Inorganic

Abstract

A plastics construction member, in particular an impact-absorbing external body panel, such as an engine bonnet or mudguard for a motor vehicle is formed of a sandwich construction having inner and outer skins bonded to a soft core 4 of, for example, hard foam, a honeycomb structure or paper webs. Crumple zones are formed in selected surface regions (5, 6) by forming a separation between the skins 2, 3 and the core 4 or between layers of the soft core. An aluminium or plastics foil with a separation coating may be used to define the regions, or the core may be cut parallel to the skins. <IMAGE>

Description

1
GB 2 184 403A 1
SPECIFICATION
Plastics construction member for a motor vehicle
5
The invention relates to a plastics construction member in particular a motor vehicle body panel having built in weaknesses to form a crumple zone.
10 An impact absorbing body panel for a motor vehicle, which is constructed in the form of a pressed sheet metal part and which is provided on its inside with defined points of weakness at which impact forces act first, is 15 known from DE-OS 2238676.
A further vehicle body panel of plastics construction is known from DE-OS 2548 398. In this case, the plastics construction member is formed as a homogeneous plastics diecast or 20 injection-moulded part and on its inner surface it comprises defined cross-sectional constrictions on which forces of impact act first, so as to result in a preferred destruction of the plastics construction member,
25 A plastics construction member of this type has the disadvantage that, on grounds of styling, defined points of weakness should be formed in practice only on the inside, i.e. on the face remote from the visible surface. In 30 addition, during adjustment procedures tool changes are required and the plastics construction member cannot be appreciably effective in an impact-absorbing manner, i.e. in such a way as to absorb energy and reduce 35 the impact forces.
The present invention seeks to provide a plastics construction member, in particular an impact absorbing external body panel for a motor vehicle, which is formed as a sandwich 40 construction member, as known per se, with relatively rigid inner and outer skins bonded to the opposite sides of a soft core of for example paper webs, a honeycomb structure or hard foam material, and is provided with 45 defined points of weakness in such a way that impact forces act first on the points of weakness and are be reduced by dissipation of energy in causing crumpling.
According to the present invention, there is 50 provided a plastics construction member for use as a motor vehicle body panel, which member is of sandwich construction having relatively rigid inner and outer skins bonded to the opposite sides of a soft core, wherein at 55 selected surface portions the connection of the skins to one another through the soft core is locally interrupted to provide regions of weakness at which crumpling can occur preferentially upon impact.
60 The soft core may conveniently be formed of paper webs, a honeycomb structure or a plastics foam.
In one embodiment of the invention, one of the skins is not bonded to the soft core at 65 the selected surface portions. This may advantageously be achieved by preventing the bonding of one of the skins to the soft core by interposing a foil having a separation coating between the core and the skin.
70 In an alternative embodiment, at the selected surface portions, the soft core is formed with a cut in a plane generally parallel to the surfaces of the member.
In the proposed construction of the mem-75 ber, surface portions not strengthened by the sandwich constructions may be formed on either surface of the member, thereby reducing the maximum compressive stress that can be withstood upon impact and creating a 80 crumple zone wherever desired without marring the outer appearance of the member. Energy is absorbed upon impact in that the outer skins are peeled off the soft core by the impact forces, the impact energy being dissi-85 pated in the peefing of the skins from the soft core and in the bending and destruction of the skins.
The invention will now be described further, by way of example, with reference to the ac-90 companying drawings, in which:
Figure 1 is an oblique view of a front mudguard of a motor vehicle of sandwich construction,
Figure 2 is a section along the line II—II in 95 Fig. 1 with the detached surface portions,
Figure 3 is an oblique view of an engine ,bonnet of a motor vehicle in the form of a sandwich construction member, and
Figure 4 is a section along the line IV—IV in 100 Fig. 3 with the detached surface portions.
The front mudguard 1 of a motor vehicle shown in Fig. 1 and 2 is constructed as a sandwich construction member. The front mudguard 1 thus comprises a thick and rigid 105 inner skin 2 and a similar outer skin 3, which are joined together by way of a soft core layer 4 of paper webs, honeycomb structures or hard foam material.
At specific defined positions on the front 110 mudguard 1 detached surface portions 5 and 6 respectively, in the region of which the connection between the inner and outer skins 2 and 3 and the core layer 4 is interrupted, are provided between the inner skin 2 and the 115 core layer 4 and between the outer skin 3 and the core layer 4 respectively. In this connection the separation between the skins 2 and 3 and the core layer 4 can be effected in an advantageously simple manner by a local 120 separating foil insert in the form of aluminium, plastics foils of for example polyethylene or layers of other separating means. In the case of production the desired points of weakness can be produced by pressing appropriate sur-125 faces of separating means onto the prepared core layer, by the so-called pre-press method.
In the case of the engine bonnet 1' of a motor vehicle illustrated in Figs. 3 and 4 the construction is generally similar, and for this 130 reason the individual parts have been given
2
GB 2 184 403A 2
the same reference numerals, only provided with a prime. The mode of operation is accordingly the same as was explained in connection with Figs. 1 and 2.
5 In the central area of the engine bonnet 1' a further embodiment of the invention is indicated in dash-dot lines, indicating a detached surface portion 7 inside the core layer 4', which is formed for example by two core
10 layer portions which are superposed one above he other but are not joined or by a locally cut portion of the core layer. In this case a folding on one side is not initiated but a bellows-shaped spreading of the sandwich
15 construction member is initiated, in which the non-detached surfaces of the core layer adjacent the detached partial surface 7 start to tear and thereby dissipate the forces of impact.
20 The defined layout and the course of the detached surface portions 5, 6, and 5',6' and 7 respectively, can be determined by calculation or experimentally and can be arranged in such a way that in these surface regions the
25 sandwich construction member receives a local stability which is less than the load peak as a cutting force. In this way a local corrugation can be produced on the sandwich construction member in the event of impact.
30

Claims (6)

1. A plastics construction member for use as a motor vehicle body panel, which member is of sandwich construction having relatively
35 rigid inner and outer skins bonded to the opposite sides of a soft core, wherein at selected surface portions the connection of the skins to one another through the soft core is locally interrupted to provide regions of weak-
40 ness at which crumpling can occur preferentially upon impact.
2. A plastics construction member as claimed in claim 1, wherein the soft core is formed of paper webs, a honeycomb structure
45 or a plastics foam.
3. A plastics construction member as claimed in claim 1 or 2, wherein at the selected surface portions, one of the skins is not bonded to the soft core.
50
4. A plastics construction member as claimed in Claim 3, wherein to prevent the bonding of one of the skins to the soft core a foil with a separation coating is interposed between the core and the skin.
55
5. A plastics construction member as claimed in claim 1 or 2, wherein at the selected surface regions, the soft core is formed with a cut in a plane generally parallel to the surfaces of the member.
60
6. A plastics construction member substantially as herein described with reference to and as illustrated in the accompanying drawings.
Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd, Dd 8991685, 1987. Published at The Patent Office, 25 Southampton Buildings, London, WC2A 1AY, from which copies may be obtained.
GB08619703A 1985-12-24 1986-08-13 Plastics construction member for a motor vehicle Withdrawn GB2184403A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853546050 DE3546050A1 (en) 1985-12-24 1985-12-24 PLASTIC COMPONENT, IN PARTICULAR SHOCK-ABSORBING BODY EXTERIOR FOR MOTOR VEHICLES

Publications (2)

Publication Number Publication Date
GB8619703D0 GB8619703D0 (en) 1986-09-24
GB2184403A true GB2184403A (en) 1987-06-24

Family

ID=6289535

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08619703A Withdrawn GB2184403A (en) 1985-12-24 1986-08-13 Plastics construction member for a motor vehicle

Country Status (4)

Country Link
US (1) US4950522A (en)
EP (1) EP0230611B1 (en)
DE (2) DE3546050A1 (en)
GB (1) GB2184403A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671595A1 (en) * 1991-01-16 1992-07-17 Commissariat Energie Atomique SHOCK-RESISTANT PANEL BY ABSORPTION OF ENERGY.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671595A1 (en) * 1991-01-16 1992-07-17 Commissariat Energie Atomique SHOCK-RESISTANT PANEL BY ABSORPTION OF ENERGY.
EP0495715A2 (en) * 1991-01-16 1992-07-22 Commissariat A L'energie Atomique Energy-absorbing, shock-resistant panel
EP0495715A3 (en) * 1991-01-16 1992-09-16 Commissariat A L'energie Atomique Energy-absorbing, shock-resistant panel

Also Published As

Publication number Publication date
US4950522A (en) 1990-08-21
DE3546050C2 (en) 1989-08-24
DE3667774D1 (en) 1990-02-01
EP0230611A3 (en) 1987-11-04
EP0230611A2 (en) 1987-08-05
GB8619703D0 (en) 1986-09-24
DE3546050A1 (en) 1987-07-02
EP0230611B1 (en) 1989-12-27

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