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
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
• • 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
  • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
  • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
  • F16B5/0216—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread the position of the plates to be connected being adjustable
  • F16B5/0225—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread the position of the plates to be connected being adjustable allowing for adjustment parallel to the plane of the plates

Definitions

• the invention relates to a mechanical assembly.
• the invention relates more particularly to a mechanical assembly comprising a first element and a second element assembled to each other by means of first and second respective flat contact faces, of the type which includes means for positioning the elements relative to each other in the plane of the contact faces and of the means for fixing from one element to the other in a fixing direction perpendicular to the plane of the contact faces, of the type in which the means of positioning include at least one cylindrical positioning member, which extends perpendicularly from the first contact face, and a hole in the second element which opens into the second contact face and which is intended to receive the cylindrical member, and of the type in which the fixing means comprise at least one fixing member, which extends perpendicularly from the first contact face, and a bore in the second element which opens into the second contact face and which is intended to receive the fixing member.
• the two holes may for example be substantially cylindrical and be of a diameter greater than that of the cylindrical members so to allow the assembly to be positioned by gravity along the generators of contact between the members and the cylindrical holes.
• At least one of the cylindrical positioning members also forms a fixing member and it is for example made up of a stud which is intended to allow the clamping of the second element on the first by means of a nut.
• An assembly of this type has on the one hand the disadvantage of allowing positioning only in a single and imposed position, and on the other hand of not guaranteeing a certain positioning of the second element relative to the first when the assembly is subjected to various mechanical stresses such as expansion or vibrations.
• one of the holes may for example be substantially cylindrical and be of a diameter greater than that of one of the cylindrical members, and the other hole may be made under the form of an oblong hole of width greater than the diameter of the other cylindrical member.
• At least one of the cylindrical positioning members also forms a fixing member and it is for example constituted by a stud which is intended to allow the tightening of the second element on the first by means of a nut.
• An assembly of this type has on the one hand the drawback of imposing an orientation of the oblong hole of the second element along the possible direction of deformation of the assembly, and on the other hand of being costly to produce, the realization of said oblong hole being generally more expensive than that of a simple drilling.
• the invention proposes an assembly of the type described above, using only cylindrical holes and allowing both precise positioning and optimal position maintenance when the assembly is stressed.
• the invention provides an assembly of the type described above, characterized in that the positioning means comprise " at least four cylindrical holes of the second element, which are tangent internally to as many cylindrical positioning members of the first element, and whose axes are offset relative to the axes of the cylindrical members for positioning in respective directions of offset which intersect at a point in a zone of the second element in which the stresses are zero when the assembly is requested.
• the cylindrical members for positioning the first element are each of a diameter which is less than the diameter of the associated cylindrical hole of the first element and which is intended to take account of the deformations of the second element when the assembly is requested,
• cylindrical members for positioning the first element are offset each at a distance from the point of the zone of zero stress of the second element which is provided to take account of the deformations of the second element when the assembly is stressed,
• At least one fixing member consists of a cylindrical positioning member and at least one bore consists of an associated cylindrical hole
• the assembly comprises a centering member, q which extends perpendicularly from the first contact face, .. and a coaxial centering hole of the second element which opens into the second contact face, the axes of which coincide with the point of the stress zone n ulle of the second element,
• At least one fixing member consists of the centering member and at least one bore consists of the associated centering hole, '
• At least one fixing member comprising an axial immobilization means, in particular a stud or a screw,
• At least one fixing member comprises a means of radial immobilization, in particular a rod.
• FIG. 1 is a front view in a direction perpendicular to the plane of the contact faces of a first assembly according to a prior state of the art
• FIG. 2 is a front view in a direction perpendicular to the plane of the contact faces of a second assembly according to a prior state of the art
• FIG. 3 is a front view in a direction perpendicular to the plane of the contact faces of an assembly according to a first embodiment of the invention, shown in the rest position,
• - Figure 4 is a view of the assembly of Figure 3, shown in position biasing
• - Figure 5 is a front view in a direction perpendicular to the plane of the contact faces of an assembly according to a second embodiment of the invention, shown in the rest position.
• each assembly 10 comprises a first element 12 and second element 14 which are assembled to one another by means of first and second planar faces 16, 18 respective contacts.
• each assembly 10 comprises means for positioning the elements 12, 14 relative to each other in the plane of the contact faces 16, 18 and it comprises means for fixing an element to the other in a direction "D" of fixing perpendicular to the plane of the contact faces 16, 18.
• the positioning means comprise at least one cylindrical positioning member 20 which extends perpendicularly from the first face 16 of contact, and a hole 22 of the second element 14 which opens into the second contact face 18 and which is intended to receive the cylindrical member 20.
• the fixing means comprise at least one fixing member 24, which extends perpendicularly from the first contact face 16, and a bore 26 of the second element 14 which opens into the second contact face 18 and which is intended to receive the fixing member 24.
• Figure 1 illustrates more particularly an assembly 10, for which the common plane of the contact faces 16, 18 is intended to be oriented substantially in the vertical direction "V".
• the positioning means of this assembly 10 comprise two cylindrical positioning members 20, which extend perpendicularly from the first contact face 16, and cylindrical holes 22 of the second element 14 which open into the second face 18 contact and which are each intended to receive an associated cylindrical member 20.
• the holes 22 are each of a diameter greater than the associated cylindrical member 20, so that when the assembly 10 is placed in position in the vertical direction "V", each cylindrical member 20 for positioning is in contact with the associated hole 22 via a common generator "G", the trace of which is seen in FIG. 1.
• the fixing means are merged with the positioning means.
• Bodies 24 for fixing the first element 12 are merged with the members 20 for positioning, and holes 26 for the second element 14 are merged with the cylindrical holes 22 for positioning.
• the fixing members 24 are for example made up of studs which allow the fixing of the second element 14 in the form of a plate. on the first element 12 by tightening a nut (not shown) which is arranged in contact with the back of the second element 14.
• This configuration has on the one hand the disadvantage of requiring that the assembly 10 be arranged vertically, and on the other hand the disadvantage of allowing relative movement of the elements 12 and 14 relative to each other when assembly
• FIG. 2 illustrates an assembly 10, for which the positioning means comprise two cylindrical positioning members 20 which extend perpendicularly from the first contact face 16.
• the second element 18 has a cylindrical hole 22 and an oblong hole 23 which open into the second contact face 18 and which are each intended to receive an associated cylindrical member 20.
• the cylindrical hole 22 is of a diameter greater than the associated cylindrical member 20 and the oblong hole 23 is of a width substantially equal to the diameter of the associated fixing member 20, so that when the elements 12 and 14 are assembled, the assembly 10 is positioned precisely by the opposite faces 25 of the oblong hole 23.
• the fixing means are merged with the positioning means.
• Fastening members 24 for the first element 12 are combined at least one of the positioning members 20, and holes 26 for the second element 14 are coincident with at least one of the cylindrical holes 23 and 23 for positioning.
• the fixing members 24 are for example made up of studs which allow the fixing of the second plate-shaped element 14 on the first element 12 by tightening a nut (not shown) which is arranged in contact with the back of the second element 14.
• This configuration has on the one hand the disadvantage of being costly to carry out, since the machining of the oblong hole 23 is of a higher cost than that of a cylindrical hole, and on the other hand it has the disadvantage to need to match the main direction of deformation according to which the assembly is liable to deform with the general direction of the oblong hole 23.
• the invention proposes to remedy the drawbacks of the above-mentioned assemblies by proposing an assembly 10 which can be declined according to two embodiments shown in FIGS. 3 to 5.
• the invention proposes an assembly 10 of the general type described above, which is characterized in that the positioning means comprise at least four cylindrical holes 22a, 22b, 22c, 22d of the second element 14, which are tangent internally to as many cylindrical members 20a, 20b, 20c, 20d for positioning the first element 12, and whose axes Xa, Xb, Xc, Xd, are offset relative to the axes Ya , Yb, Yc, Yd of the cylindrical members 20a, 20b, 20c, 20d of positioning in respective directions Za, Zb, Zc, Zd of offset which are intersecting at a point "N" of a zone of the second element 14 in which the stresses are zero when the assembly 10 is stressed.
• the positioning means comprise at least four cylindrical holes 22a, 22b, 22c, 22d of the second element 14, which are tangent internally to as many cylindrical members 20a, 20b, 20c, 20d for positioning the first element 12, and whose axes Xa, Xb, Xc
• cylindrical members 20a, 20b, 20c, 20d for positioning the first element 12 are each of a diameter which is less than the diameter of the associated cylindrical hole 22a, 22b, 22c, 22d of the second element 14 and which is designed to take account of the deformations of the second element 14 when the assembly 10 is stressed, as shown in FIG. 4.
• cylindrical members 20a, 20b, 20c, 20d for positioning the first element 12 are each offset at a distance Ra, Rb, Rc, Rd respectively from the point 'N "of the zero stress zone of the second element 14 which is designed to take account of the deformations of the second element 14 when the assembly 10 is stressed
• this configuration advantageously allows, in a rest configuration of the assembly 10 which corresponds in particular to the mounting of the second element 14 on the first element 12, that all the cylindrical members 20a, 20b, 20c, 20d for positioning the first element 12 are effectively tangent to the cylindrical holes 22a, 22b, 22c, 22d.
• At least one fixing member consists of a cylindrical member 20a, 20b, 20c, 20d for positioning and at least one associated drilling to the fixing member consists of an associated cylindrical hole 22a, 22b, 22c, 22d.
• each cylindrical member 20a, 20b, 20c, 20d for positioning constitutes a fixing member.
• each cylindrical member 20a, 20b, 20c, 20d for positioning includes a means of axial immobilization of the second element 14, for example a stud or a screw which is intended to allow the tightening of the second element 14 against the first element 12, or a radial immobilization means, such as a rod which is intended to cooperate with the walls of the associated cylindrical hole 22a, 22b, 22c, 22d to immobilize the second element 14 relative to the first element 12.
• the assembly 10 comprises a centering member 28, which extends perpendicularly from the first contact face 16, and a hole 30 of coaxial centering of the second element 14 which opens into the second contact face 18.
• the axes (not shown) of the centering member 28 and of the centering hole 30 pass substantially through the point "N" of the zone of zero stress of the second element 14.
• the centering member 28 is received with clearance in the centering hole 30 to allow the mounting of the second element 14 on the first element 12.
• this clearance is not necessarily high, since when the assembly 10 is stressed mechanically as shown in Figure 4, the area of zero stress in which the centering member 28 is arranged and the centering hole 30 is not stressed.
• the assembly 10 can be formed at rest by mounting the second element 14 on the first element 12, as shown in FIG. 3.
• the second element 14 is first placed in position on the centering member 28 which may for example be longer than the cylindrical members 20a, 20b, 20c, 20d for positioning.
• the second element 14 is pivoted in a plane parallel to the plane of the contact faces 16, 18 so that the cylindrical holes 22a, 22b, 22c, 22d of the second element 14 come opposite the cylindrical members 20a, 20b, 20c, 20d of the first element 12.
• the second element 18 is lowered so that the contact faces 16, 18 are pressed against each other and that the cylindrical members 20a, 20b, 20c, 20d for positioning are tangent with the cylindrical holes 22a, 22b, 22c, 22d.
• the centering member 28 preferably constitutes a radial or axial fixing member in the same way as the cylindrical members 20a, 20b, 20d in position.
• the assembly 10 when the assembly 10 is stressed mechanically as illustrated in FIG. 4, the second element 14 does not stress the cylindrical members 20a, 20b, 20c, 20d, because the position of the axes Ya, Yb, Yc, Yd of the latter moves along the offset directions Za, Zb, Zc, Zd while remaining inside the cylindrical holes 22a, 22b, 22c, 22d.
• the assembly 10 has no centering member. In this configuration, the assembly 10 can be formed at rest by mounting the second element 14 on the first element 12 so that the cylindrical holes 22a, 22b, 22c, 22d of the second element 14 come opposite the cylindrical members 20a, 20b, 20c, 20d of the first element 12.
• the second element 18 is lowered so that the contact faces 1-6, 18 are pressed against each other and that the cylindrical members 20a, 20b, 20c, 20d for positioning are tangent with the holes cylindrical 22a, 22b, 22c, 22d. Finally, the second element 14 is clamped on the first element 12.
• the second element 14 does not stress the cylindrical members 20a, 20b, 20c, 20d, because the position (not shown) of the axes Ya, Yb, Yc, Yd of the latter evolves along the directions Za, Zb, Zc, Zd of offset while remaining inside the cylindrical holes 22a, 22b, 22c, 22d.
• the invention therefore makes it possible to constitute an assembly 10 whose attachment points are not stressed when the assembly 10 is mechanically stressed. As such, it is applicable to a large number of situations, in particular in the context of assemblies 10 implemented in automobile construction.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Connection Of Plates (AREA)

Applications Claiming Priority (3)

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• 2001
  • 2001-07-31 FR FR0110229A patent/FR2828246B1/fr not_active Expired - Fee Related
• 2002
  • 2002-07-05 EP EP02791494A patent/EP1412643A1/de not_active Withdrawn
  • 2002-07-05 WO PCT/FR2002/002357 patent/WO2003012301A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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