Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D23/00—Combined superstructure and frame, i.e. monocoque constructions
  • B62D23/005—Combined superstructure and frame, i.e. monocoque constructions with integrated chassis in the whole shell, e.g. meshwork, tubes, or the like
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D27/00—Connections between superstructure or understructure sub-units
  • B62D27/02—Connections between superstructure or understructure sub-units rigid
  • B62D27/023—Assembly of structural joints
• • 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
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
  • F16B2200/67—Rigid angle couplings
• • 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
  • Y10T403/00—Joints and connections
  • Y10T403/34—Branched
  • Y10T403/341—Three or more radiating members
  • Y10T403/342—Polyhedral
• • 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
  • Y10T403/00—Joints and connections
  • Y10T403/34—Branched
  • Y10T403/347—Polyhedral

Definitions

• the ⁇ invention relates to a three-dimensional node structure formed from hollow profiles of a support frame for vehicles and a method for their production.
• EP 0568 213 B1 describes a three-dimensional node structure with a connecting piece for connecting elements of a vehicle support frame.
• the connecting piece consists of a preferably extruded U-profile with two leg plates and a web plate connecting the leg plates, into which a support element is inserted and connected to it by gluing.
• On the outer sides of a leg plate and the web plate essentially cuboid attachment pieces are fastened, onto which further supporting elements can be attached on the end face and glued to the connecting piece, so that, as a result, the supporting elements can be connected to form a stable knot structure in a compact design.
• EP 0 568 251 B1 describes a support frame for vehicles which consists of several assemblies based on hollow profiles.
• the hollow profiles are connected to one another via knot structures of various types in an extended or angled position, preferably in a rectangular position.
• the connection of profiles arranged at right angles to one another, for example the connection between the B-pillar and side skirts, is realized via a T-shaped knot structure.
• a first hollow profile with a rectangular cross-section has at its one end two sections with a C-shaped cross-section which are bent by 90 ° and are aligned with one another, to which a second hollow profile is placed and welded can.
• the three-dimensional frame structure is realized by means of two-dimensionally designed node structures.
• a three-dimensional knot structure, ie the mutual connection of hollow profiles extending in three spatial directions at one point is not provided here.
• a node structure similar to the aforementioned embodiment of a T-node is known from DE 37 26 079 AI.
• a door frame construction for commercial vehicles, in particular buses, is described in this publication.
• the central component of this construction is a T-node structure for connecting two hollow profiles at right angles to each other as components of the door frame.
• One of the hollow profiles is so long at its end facing the other profile in opposite side surfaces cut out that two U-shaped connectors are formed, which are deformable to a desired transition contour and can be placed on the profile to be connected. Since the door frame is a purely two-dimensional construction, no three-dimensional node structures are consequently realized here either.
• the hollow high-pressure forming technology which is favorable in terms of weight due to the lack of welding flanges, is used to produce a three-dimensional knot structure.
• IHU hollow high-pressure forming technology
• the invention is therefore based on the object of creating a node structure of the type mentioned which is distinguished by a compact design and low weight with high rigidity.
• knot structure of the type mentioned at the outset in that the knot structure consists of two hollow profiles, of which the first hollow profile has at least one flat side and is cut along its circumference except for a web lying in the flat side and bent around this web is, and the second hollow profile has at least two flat sides, which on the resulting from the separation and bending, mutually facing ends of the first hollow profile abut, the two hollow profiles being integrally connected to one another at the edge regions of the first hollow profile.
• the particular advantage of this is that the opening of the first hollow profile with subsequent bending operation enables an extremely small bending radius to be achieved compared to conventional node structures produced by IHU, which enables a very compact and therefore weight-optimized construction of the node structure.
• a very high degree of rigidity is achieved, since the side walls of the second hollow profile lying against the ends of the first hollow profile reinforce the knot structure as partition plates of the first hollow profile.
• the use of additional reinforcing components in the form of support plates or the like is therefore no longer necessary, which contributes to a lightweight construction.
• the contours of the two hollow profiles lie against one another as gap-free as possible. This results in an improved distribution of the forces acting in the event of a crash over the entire support frame, thereby reducing the risk of individual elements of the support frame collapsing. In particular, the occurrence of selective load peaks is avoided, since the hollow profiles are in a form-fitting manner. Since such three-dimensional node structures are used especially in the area of the passenger cell, this results in increased protection for the vehicle occupants in the event of a crash.
• the mutually facing ends of the first hollow profile have projecting edge regions which abut the second hollow profile. These form well usable connection zones for connecting the two hollow profiles by welding, soldering or another joining process.
• the node structure is used in particularly stressed areas of the vehicle support frame, it is expedient that in the area of the edges of the first hollow profile along the separating cut, square cutouts which extend over the entire edge radius and are curved in accordance with the edge radius are cut out symmetrically to the separating cut. This largely avoids a stress-induced notch effect in the corners of the mutually facing ends of the first hollow profile. In this context, it proves to be particularly advantageous if the cutouts have rounded corners. If the node structure is used in less loaded areas of the vehicle support frame, these configurations can be dispensed with in terms of cost-effective production.
• the above-mentioned object is achieved by a method for producing the knot structure according to the invention with the following steps: a) cutting a first hollow profile with at least one flat side along its circumference except for a web lying in the flat side. b) bending up the first, partially separated
• Hollow profile around the web lying on the flat side c) attaching a second hollow profile having two flat sides with these sides to the mutually facing ends of the first hollow profile created by the separation and bending and d) integrally connecting the second hollow profile to the first hollow profile on its edge areas.
• the geometry of the three-dimensional knot structure can be adapted to the spatial requirements of the user without excessive manufacturing effort.
• the angle between the two flat sides of the second hollow profile must coincide with the bending angle in order to allow the two hollow profiles to lie against one another as gap-free as possible.
• the first hollow profile is shaped along its circumference, except for a web lying in the flat side, before the cutting, and that the separating cut is made centrally through the molding.
• the shape is preferably introduced into the first hollow profile by internal high-pressure molding.
• the first hollow profile is cut by laser beam cutting. This enables precisely cut edges, which also facilitates the integral connection of the hollow profiles.
• the hollow profiles can be connected by welding or soldering, the use of laser radiation for welding or soldering again proving to be particularly advantageous.
• 1 is a three-dimensional knot structure of a support frame for vehicles formed from hollow profiles in a perspective view
• FIG. 2 shows the node structure of FIG. 1 in a top view from the view of arrow A in FIG. 1,
• FIG. 3 shows the knot structure of FIG. 1 with the weld seams omitted from the view of arrow A in FIG. 1,
• FIG. 4 shows the node structure of FIG. 1 in cross section along line BB of FIG. 2, 5 ae the method steps for producing the node structure of FIG. 1,
• the three-dimensional knot structure shown in FIG. 1 consists of two hollow profiles 1, 2, which together form the shape of a tripod and are integrally connected to one another.
• the first hollow profile 1, which has a substantially square cross section, is cut along its circumference except for a web lc and bent up around the web lc, so that two mutually facing ends la, lb of the hollow profile 1 are formed.
• the second hollow profile 2 has a cross section in the form of an isosceles triangle and lies with its leg sides 2a, 2b at the ends la, lb of the first hollow profile 1.
• the angle between the leg sides 2a, 2b corresponds to the bending angle, so that the leg sides 2a, 2b rest against the end faces of the ends la, lb of the hollow profile 1 with as little gaps as possible.
• the two ends la, lb of the hollow profile 1 have edge regions ld, le, lf which are bent over along their separating cut and which abut the leg sides 2a, 2b of the hollow profile 2. With its front end, the hollow profile 2 is approximately flush with the bent edge regions ld of the ends la, lb, which results in the aforementioned shape of a tripod. An extension beyond the hollow profile 1 is, however, conceivable.
• the two ends la, lb of the hollow profile 1 are at their bent edge regions ld, le, lf with the leg sides of the second hollow profile via weld seams 3a, 3b, 3c connected.
• the common edge 2c of the leg sides 2a, 2b of the hollow profile 2 is connected to the web 1c of the hollow profile 1 via a weld 3d.
• FIGS. 2 and 3 show a top view of the knot structure, the illustration of the weld seams being omitted in FIG. 2 for reasons of clarity.
• FIG. 5ae the individual method steps for producing the node structure are shown.
• a molding lx is first introduced into three sides of the hollow profile 1 along its circumference by means of internal high pressure forming.
• the hollow profile 1 is then cut along the center of the formation lx, preferably by laser beam cutting, except for a web 1c in the non-formed fourth side (FIG. 5b).
• the cutting tool is guided in such a way that in the area of the edges of the hollow profile (1), rectangular cutouts (lg) which extend over the entire edge radius and are curved in accordance with the edge radius are cut out symmetrically to the separating cut.
• protruding edge regions ld, le, lf are produced along the separating cut.
• the hollow profile 1 is then bent up around the web 1c by the bending angle (FIG. 5c).
• the hollow profile 2 with its leg sides 2a, 2b, the included angle of which corresponds to the bending angle ⁇ , is attached to the ends la, lb of the hollow profile 1 (FIG. 5d), so that the projecting edge regions ld, le, lf are all rest on the leg sides 2a, 2b.
• the ends la, lb of the hollow profile 1 are welded to the leg sides 2a, 2b of the hollow profile 2 at the projecting edge regions ld, le, lf.
• the web 1c is welded to the common edge 2c of the leg sides 2a, 2b.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Body Structure For Vehicles (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

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ID=28684829

Family Applications (1)

Country Status (9)

Cited By (2)

Families Citing this family (42)

Citations (4)

Family Cites Families (19)

• 2002
  • 2002-04-09 DE DE10215442A patent/DE10215442B4/de not_active Expired - Fee Related
• 2003
  • 2003-04-04 DE DE50306910T patent/DE50306910D1/de not_active Expired - Lifetime
  • 2003-04-04 EP EP03720421A patent/EP1511668B1/de not_active Expired - Lifetime
  • 2003-04-04 CN CNB038125250A patent/CN100379632C/zh not_active Expired - Fee Related
  • 2003-04-04 JP JP2003582016A patent/JP4615224B2/ja not_active Expired - Fee Related
  • 2003-04-04 ES ES03720421T patent/ES2285115T3/es not_active Expired - Lifetime
  • 2003-04-04 WO PCT/EP2003/003512 patent/WO2003084800A1/de not_active Ceased
  • 2003-04-04 AU AU2003224037A patent/AU2003224037A1/en not_active Abandoned
  • 2003-04-04 BR BRPI0309132-5A patent/BR0309132B1/pt not_active IP Right Cessation
  • 2003-04-04 US US10/509,587 patent/US7500802B2/en not_active Expired - Lifetime

Patent Citations (4)

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