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
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
  • F16C7/02—Constructions of connecting-rods with constant length
• • 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
  • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
  • F16B7/18—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements
  • F16B7/182—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements for coaxial connections of two rods or tubes
• • 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
  • Y10T74/00—Machine element or mechanism
  • Y10T74/21—Elements
  • Y10T74/2142—Pitmans and connecting rods

Definitions

• the present invention relates to a tubular mechanical link.
• Tubular mechanical rods are used, that is to say hollow bodies, especially in areas where the search for mass gain is a constant concern.
• the tubular mechanical rods are for example used on the landing gear (brake bar), in the maintenance systems in the open position of the maintenance covers (bonnet , ...), in engine suspension systems (interface transmitting the thrust between the engine and the mast of the wing), etc.
• a tubular mechanical connecting rod is conventionally composed of a hollow body, having at each of its ends a rod head.
• Each end of the rod is typically shaped as a male or female clevis, so as to allow the fixing of the connecting rod by pin or other means to the bodies with which it must cooperate.
• tubular mechanical connecting rod by means of welding operation (s) proves delicate and generally requires, because of the disadvantages inherent to the weld detailed above, additional machining steps to obtain a connecting rod. geometry and mass in accordance with the specifications in force in the field of aeronautics.
• a connecting rod must be able to take considerable thrust forces generated by the turbojet, while having the lowest mass possible. Therefore, it is important on the one hand that the metal alloy forming the rod is adapted as much as possible to the operating conditions, so as to have the most interesting specific properties possible (mechanical properties divided by the density), and on the other hand that the connecting rod is tubular.
• the object of the present invention is to provide a tubular mechanical connecting rod which has been manufactured by eliminating welding operations and which consequently is free of any defects inherent to the welding.
• tubular connecting rod comprises: a hollow body comprising at least one end provided with an opening,
• a small-bore head arranged to be fitted through the opening, said connecting rod head having at least one blocking means arranged to position the connecting rod head relative to the opening of the hollow body in a determined locking position,
• tubular connecting rod being characterized in that the end of the hollow body is provided with at least one slot.
• the term "grip" means that the connecting rod head is secured to the end of the hollow body by a secure fit.
• the locked fit is obtained because of the complementarity of the shapes that present the end of the connecting rod and the end of the hollow body and which allows the engagement of the big end in the end of the hollow body in a determined locking position .
• the end of the hollow body is provided with a plurality of uniformly distributed slots which open on the opening of the hollow body. This gives elasticity to the hollow body and thus facilitates the catching of the dimensional tolerances between the first part or the second part of the big end and the hollow body.
• the end of the non-opening side slot is provided with a radius to limit the stress concentrations, this radius may even be greater than half the width of the slot.
• the connecting rod head is monobloc.
• the connecting rod head is formed:
• a first part which comprises at least a first blocking means arranged to position said first part relative to the opening of the hollow body in a first determined locking position
• a second portion which comprises at least a second blocking means arranged to position said second portion relative to the hollow body in a second determined locking position.
• the first part and the second part of the big end can have been obtained by cutting a whole big end. If the end of the connecting rod is formed of two distinct parts as described above, this has the advantage of not being confronted with strict dimensional tolerance requirements which must be met when a substantially cylindrical piece of a hollow cylinder.
• the first part and the second part of the big end can be introduced into the hollow body and pressed against this hollow body, and this even with the extreme dimensional tolerances of the hollow body and the head of the hollow body.
• the connecting rod, said two-part cone head allowing a clearance between these two parts.
• the connecting rod head is monobloc, the dimensional tolerances compensation will be performed only with the slots of the hollow body.
• the alloys used to form the tubular connecting rod according to the invention are typically alloys based on nickel, iron, titanium or aluminum.
• the locking means is a shoulder.
• the end of the hollow body comprises at least a first fastening means for fixing the end of the hollow body on the connecting rod head.
• This first fixing means may be an orifice for the introduction of a fixing screw.
• this first fixing means may comprise a countersink or bleach. This gives a good distribution of forces on the fixing screw head.
• the connecting rod head comprises at least a second fixing means intended to cooperate with the first fastening means so as to fix the end of the hollow body on the connecting rod head.
• the second fixing means is a bore.
• the hollow body has at its end an extra thickness.
• This provides the advantage of ensuring better resistance to the matting of the hollow body.
• the hollow body is advantageously made by spinning. Flow spinning consists of deforming the preform on a mandrel by forming using one or more knurls. This allows to obtain, simply, quickly and without removal of material, the desired thickness variations of the hollow body of the tubular connecting rod.
• the tubular connecting rod comprises:
• said two crank heads having at least one blocking means arranged to position the crankshaft relative to the opening of the hollow body in a determined locking position.
• FIG. 1 represents a perspective view of a support structure of a turbojet engine with an aircraft mast incorporating two tubular connecting rods according to the invention
• FIG. 2 is a perspective view of a portion of one of the two tubular rods shown in FIG. 1;
• FIG. 3 is a front view of a portion of one of the two tubular rods shown in FIG. 1;
• FIG. 4 is a sectional view along the plane IV of Figure 2 of the tubular connecting rod portion of Figure 2.
• the reference X, Y, Z respectively designates the axial, transverse and vertical directions of a turbojet engine (not shown) intended to cooperate with the suspension device represented in this figure.
• the suspension device shown in FIG. 1 comprises two tubular connecting rods 1, 23 whose first ends 3 each comprise a female yoke intended to cooperate with a front part of the turbojet engine, and whose second ends 26 each comprise a male yoke (no visible in Figure 1) which cooperate with a suspension beam 17.
• the suspension beam 17 is intended to cooperate with a suspension mast the turbojet engine (not shown), and with the ferrule of the intermediate casing, via appropriate connecting rods 24, 25.
• the shoulder 19 constitutes a first means of blocking the first part 5 of the connecting rod 21 relative to the opening 4 of the hollow body 2.
• the shoulder 20 constitutes a second means of blocking the second portion 6 of the connecting rod 21 relative to the opening 4 of the hollow body 2.
• the end 3 is provided with a plurality of counterbores 12 into which unrepresented fastening screws may be introduced.
• the first portion 5 and the second portion 6 of the connecting rod 21 are provided with a plurality of bores 22 arranged so that when said first and second portions 5 , 6 are positioned respectively in their first determined blocking position and second determined blocking position, the bores 22 are in the extension of countersinks 12 and fixing screws may be introduced.
• the bores of the hollow body 2 and the first parts 5 and / or second parts 6 of the head of the rod 21 may be made in a single operation, once the first parts 5 and / or second parts 6 of the head of the connecting rod 21 positioned relative to the hollow body 2.
• the end 3 of the hollow body 2 is provided with a plurality of slots 18 which open on the opening 4 which give it a certain elasticity and thus facilitate the fitting of the connecting rod head 21 in the hollow body 2.
• the connecting rod head 21 comprises an axis 13, a nut 9 and rings 10 and 11.
• This crank head 21 may also comprise a not shown ball joint.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mutual Connection Of Rods And Tubes (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46614548

Family Applications (1)

Country Status (8)

Families Citing this family (1)

Family Cites Families (15)

• 2011
  • 2011-08-01 FR FR1157035A patent/FR2978689B1/fr active Active
• 2012
  • 2012-07-13 CA CA2842574A patent/CA2842574A1/fr not_active Abandoned
  • 2012-07-13 BR BR112014000544A patent/BR112014000544A2/pt not_active IP Right Cessation
  • 2012-07-13 EP EP12743516.2A patent/EP2739866A1/de not_active Withdrawn
  • 2012-07-13 CN CN201280038206.2A patent/CN103717921A/zh active Pending
  • 2012-07-13 WO PCT/FR2012/051670 patent/WO2013017767A1/fr active Application Filing
  • 2012-07-13 RU RU2014106786/11A patent/RU2014106786A/ru not_active Application Discontinuation
• 2014
  • 2014-02-03 US US14/171,024 patent/US20140174251A1/en not_active Abandoned

Non-Patent Citations (1)

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