Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64C—AEROPLANES; HELICOPTERS
  • B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
  • B64C1/06—Frames; Stringers; Longerons ; Fuselage sections
• • 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
  • F16B3/00—Key-type connections; Keys
  • F16B3/06—Key-type connections; Keys using taper sleeves
• • 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
  • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
  • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
  • F16B35/041—Specially-shaped shafts
• • 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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C11/00—Pivots; Pivotal connections
  • F16C11/04—Pivotal connections
  • F16C11/045—Pivotal connections with at least a pair of arms pivoting relatively to at least one other arm, all arms being mounted on one pin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64C—AEROPLANES; HELICOPTERS
  • B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
  • B64C2001/0054—Fuselage structures substantially made from particular materials
  • B64C2001/0072—Fuselage structures substantially made from particular materials from composite materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64C—AEROPLANES; HELICOPTERS
  • B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
  • B64C2001/0054—Fuselage structures substantially made from particular materials
  • B64C2001/0081—Fuselage structures substantially made from particular materials from metallic materials
• • 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
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T50/00—Aeronautics or air transport
  • Y02T50/40—Weight reduction

Definitions

• the invention relates to a bolted joint for connecting load- transferring structural parts on an aircraft.
• Such joints are generally of double-shear configuration, a first structural part having a bolt eye being connected by means of a bolt to a second, generally fork-shaped structural part having two bolt eyes.
• the direction of the loads transferred through the bolt from the structural parts runs at right an- gles to the bolt axis.
• bolted joints can also be realized in which the direction of the load arriving through the first structural part forms an angle ⁇ 90° with the bolt axis. This means that on the side of the first structural part the bore for receiving the bolt should be made at an angle ⁇ 90°, i.e.
• the surrounds of the bore are previously thickened and this local thickening relative to the rest of the structural part is provided with a bevel precisely correspond- ing to the necessary angle.
• the said thickening is necessary because other measures, e.g. milling, for creat- ing the local bevel would lead to a weakening of the structural part.
• different bushing versions are used. If the structural parts consist of metal, then simple bushings of suitable material are forced in. If the structural parts consist of a fibre com- posite, however, then it is expedient to use so-called screw bushings. Owing to their shape, these allow the structural part material to be well supported in the axial direction.
• the thickening entails a longer bushing and hence also a longer bolt than in a struc- tural part with no thickening.
• the longer bolt and the longer bushing give rise, in the first place, to a higher weight of the bolted joint.
• the second place in the case of a longer bolt, larger distances between the particular load-application points are obtained, whereby higher bending moments act upon the bolt than in a structural part with no thickening.
• the object of the invention is therefore to refine a bolted joint according to the stated prior art in such a way that a thickening of the particular structural part, given an oblique position of the bolt axis relative to the structural part, is avoided.
• Fig. 1 shows a bolted joint in a sectional representation, comprising a bolt 1, a slotted sleeve 2, a washer 3 and a nut 4.
• the bolt 1 with the sleeve 2 respectively passes through a structural part 5, a structural part 6 and a structural part 7 and is secured by the washer 3 and the nut 4.
• the structural parts 5 and 7 are here elements of a fork, not shown, and consist of a metallic material.
• the bores present in the structural parts 5, 6 and 7 for receiving the sleeve 2 with the bolt 1 respectively form a bolt eye reinforced by a metal bushing 8, 9 and 10.
• the bushings 8 and 9 consist of suitable material, have a cylindrical shape and are pressed into the particular structural parts 5 and 7.
• the structural part 6 consists of a fibre composite, for which reason there is here provided a screw bushing 10 with a nut 11.
• the screw bushing 10 is inserted perpendicular to the surface of the structural part 6 of constant thickness.
• the bore within the bushing 10 for receiving the bolt 1 runs obliquely to the surface of the structural part 6 and at the same angle obliquely to the end face of the bushing 10.
• the axis A shown in the diagram is thus simultaneously the axis of the bolt 1 and of the said bore.
• the bolt 1 has a conical shape, against which the inner surface of the sleeve 2 comes to bear.
• the sleeve 2 is firstly put through the bolt eyes of the structural parts 5, 6 and 7.
• the bolt 1 is then introduced into the sleeve 2 and secured by means of the washer 3 and the nut 4.
• the bolt 1 and the sleeve 2 interact in such a way that the outer diameter of the sleeve 2 enlarges and the outer surface thereof comes firmly to bear against the inner surface of the bushings 8, 9 and 10 when the nut 4 is tightened.
• the illustrated section is run through the slot of the sleeve 2, so that only that region of the sleeve which can be seen on the left in the diagram appears in hatched representation.
• the nut A is tightened with a predetermined torque, whereby a defined radial force is exerted upon the bushings 8, 9 and 10 and thus a non-positive connection is formed for the transfer of loads.
• the centre plane of the structural part 6 is represented by a line denoted by M. This intersects the axis A of the bolt 1 at an angle W, which, owing to the oblique position of the struc- tural part 6, which is necessary for design reasons, has a defined value ⁇ 90° .
• One embodiment of the invention consists in the bolt 1 being cylindrically configured and directly touching the bushings 8, 9 and 10.
• the inventive oblique arrangement of the bore for receiving the bolt in the bushing 10 the previous thickening in the region of the particular bolt eye is dispensed with.
• the aforementioned advantageous effects are thereby achieved, with positive repercussions upon manufacturing costs and weight of the bolted joint.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Aviation & Aerospace Engineering (AREA)
• Connection Of Plates (AREA)
• Pivots And Pivotal Connections (AREA)
• Mutual Connection Of Rods And Tubes (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38083573

Family Applications (1)

Country Status (9)

Cited By (3)

Families Citing this family (11)

Citations (3)

Family Cites Families (6)

• 2006
  • 2006-03-22 DE DE102006013069A patent/DE102006013069B3/de not_active Expired - Fee Related
• 2007
  • 2007-03-16 RU RU2008137257/11A patent/RU2008137257A/ru not_active Application Discontinuation
  • 2007-03-16 CN CNA2007800080254A patent/CN101395058A/zh active Pending
  • 2007-03-16 BR BRPI0709058-7A patent/BRPI0709058A2/pt not_active IP Right Cessation
  • 2007-03-16 CA CA002640693A patent/CA2640693A1/en not_active Abandoned
  • 2007-03-16 EP EP07727005A patent/EP1996457A1/en not_active Withdrawn
  • 2007-03-16 US US12/281,087 patent/US20090314426A1/en not_active Abandoned
  • 2007-03-16 WO PCT/EP2007/052526 patent/WO2007107521A1/en not_active Ceased
  • 2007-03-16 JP JP2009500834A patent/JP2009530169A/ja active Pending

Patent Citations (3)

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