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
  • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
  • F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment
• • 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
  • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
  • F16B19/02—Bolts or sleeves for positioning of machine parts, e.g. notched taper pins, fitting pins, sleeves, eccentric positioning rings
• • 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
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F1/00—Springs
  • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
  • F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type

Definitions

• the present invention relates to improvements made to the fastening assemblies formed of a male finger-shaped member and a socket-shaped female member which are carried on one support and the other by equipment and which are adapted to be fitted into each other for the removable fixing of the equipment on the support, said sleeve being adapted to be received in a housing provided in said support or said equipment and comprising:
• an inner ring having, in the unconstrained state, an inside diameter smaller than the outside diameter of the finger; mechanical connection means interposed between the inner ring and the housing;
• Radially deformable elastic means which are operatively associated with the inner ring to allow radial deformation of the inner ring in contact with the finger.
• the support may be integral with a vehicle (flying machine, land vehicle, floating machine) and the device can be an inertial unit which, to be able to perform its function effectively (eg vehicle guidance), must occupy an immutable position with respect to the vehicle each time it is installed on its support.
• vehicle flying machine, land vehicle, floating machine
• the device can be an inertial unit which, to be able to perform its function effectively (eg vehicle guidance), must occupy an immutable position with respect to the vehicle each time it is installed on its support.
• this system should preferably be such that this additional function is provided without modification of the support structure so that it can indifferently receive old equipment not sensitive to high frequency vibrations or new equipment sensitive to high frequency vibrations.
• US 4,647,245 discloses a female member, for a pin and socket fastener assembly, the design of which is such that it forms an integral part of the coupling block in which it is integrated. Such an arrangement is completely disadvantageous both as regards the manufacture (the mounting of this female element is complex, long and therefore expensive) than with regard to maintenance (this female element is not removable and its replacement fast is not possible). In addition, nothing is mentioned in this document on the problem posed by a filtering of mechanical vibrations at high frequencies. Document US Pat. No. 3,531,068 describes a female element implementing non-radial spacer arms between two concentric rings. Such an arrangement is not, as such, able to meet the requirements set out above, particularly with regard to the filtering of high frequency mechanical vibrations.
• the invention proposes a fixing assembly formed of a finger-shaped male element and a socket-shaped female element as exposed to the preamble, which assembly, being arranged in accordance with the invention, characterized :
• the socket also comprises an outer ring complementary to the housing provided in the support or the equipment; . in that the inner ring is disposed within said outer ring substantially coaxially therewith and radially spaced therefrom; . in that said mechanical connection means are interposed between the inner and outer rings; and
• the sleeve is adapted to receive and mechanically retain the finger in a pre-established position at the same time that the equipment is isolated from mechanical vibrations at high frequencies of the support in accordance with the desired goals.
• the means used to form the socket remain relatively simple and an acceptable cost.
• the arrangement according to the invention consists of an improved adaptation of the sleeve alone, while the finger does not have to undergo any adaptation: it follows that, if the finger is secured to the support, said support is suitable to receive indifferently old equipment and those provided with sockets according to the invention.
• the inner ring is circumferentially discontinuous and formed of a plurality of circumferentially juxtaposed sections; in particular, it may be formed of two half-rings.
• the inner ring has non-emergent longitudinal slots which open alternately from the two opposite ends of the ring; in an exemplary embodiment, the inner ring has four longitudinal slots that are not mutually open substantially offset by 90 °, the two pairs of diametrically opposed slots opening respectively from the two opposite ends of said ring.
• the connecting means and the filtering means are combined with the elastically deformable means in the radial direction, so that it becomes possible to achieve a compact and simple socket.
• the elastically deformable means in the radial direction comprise a radially elastically deformable material interposed between the two outer and inner rings.
• this material may in particular be an elastomer, chosen as a function of the frequencies to be filtered; in an exemplary concrete embodiment, the elastomer is a silicone or an elastomeric thermoplastic whose Shore hardness is greater than about 40 Shore A and the Young's modulus less than about 2.5 Gpa and has a thickness of substantially between a few tenths millimeters and a few millimeters, thanks to which the vibrations at low and high frequencies up to about 10 000 Hz are filtered without generating parasitic shocks at the interface.
• the elastomer is a silicone or an elastomeric thermoplastic whose Shore hardness is greater than about 40 Shore A and the Young's modulus less than about 2.5 Gpa and has a thickness of substantially between a few tenths millimeters and a few millimeters, thanks to which the vibrations at low and high frequencies up to about 10 000 Hz are filtered without generating parasitic shocks at the interface.
• the elastically deformable filtration material may be implemented in the form of several blocks arranged circumferentially discontinuous, these blocks being in number and implanted in an arrangement chosen according to the applications and constraints.
• the elastically deformable material is in the form of a unitary tubular section.
• the outer ring has an annular flange radial inward clean to provide an axial bearing surface for the elastically deformable material.
• the elastically deformable material may be desirable for said elastically deformable material not to provide the entire mechanical fastening of the two outer and inner rings, or even in certain modes. embodiment does not implement elastically deformable material between the two rings.
• the radially elastically deformable mechanical connection means comprise a plurality of partitions interposed between the outer and inner rings, said partitions being advantageously inclined relative to the radius of the rings in order to give the inner ring the desired capacity of displacement relative to the outer ring.
• the elastically deformable means in the radial direction may comprise a plurality of elastically deformable lamellae and supported on the inner face of the inner ring while being held elastically curved longitudinally with their convexity turned towards the inside. of the sleeve, these strips being preferably evenly distributed around the inner periphery of the inner ring. It can thus be ensured that these elastic lamellae provide the radial deformation capacity of the sleeve while the filtering means do not have such a radial deformation capacity or have insufficient radial deformation capacity, or provide a deformation capacity. additional radial which is added to that provided by the filtering means.
• the arrangements according to the invention seem to have to find a particularly preferred application in the case where the finger is integral with the support and projecting thereon and the sleeve is integral with the equipment, the outer ring being engaged and retained in said housing provided in said equipment.
• the socket arranged in accordance with the invention constitutes a complete autonomous element, which is structurally independent of the block in which it is received. This element is simply housed and retained in its housing so that it is perfectly removable: its introduction and removal, if necessary (replacement), are done quickly and without difficulty.
• the socket arranged in accordance with the invention is structurally and geometrically compatible with existing equipment and can therefore be designed to equip existing equipment.
• FIG. 1 is a very diagrammatic representation, in perspective, of equipment and a support for this equipment which are provided with at least one fixing assembly of the type referred to by the invention;
• - Figures 2A and 2B show, respectively in cross section along the line HA of Figure 2B and in diametral longitudinal section along line HB of Figure 2A, a first embodiment implementing the main features of the invention;
• - Figures 3 and 4 illustrate, in cross sections, alternative embodiments of the arrangement of Figures 2A and 2B;
• FIGS. 7A and 7B illustrate, respectively in cross section along line VIIA of Figure 7B and in diametral longitudinal section along the line VIIB of Figure 7A, yet another embodiment of the invention.
• FIGS. 8A, 8B and 8C illustrate, respectively in an exploded side view, in section along the line VHIB-VIIIB of FIG. 8A and in section along the line VHIC-VIHC of FIG. 8B, a preferred embodiment of FIG. 'invention.
• FIG. 1 to which reference is made first of all, is schematically represented a device 1 and a support 2 intended to receive and support said equipment 1 via fastening assemblies 3.
• the equipment 1 on the one hand, and the support 2, on the other hand, can be arbitrary and their shapes, volumes and constitutions, as well as the function of the equipment 1 do not come into line with account in the implementation of the provisions of the invention except that the equipment 1 must, in accordance with the objects of the invention, be joined to the support 2 by means of the fastening assemblies 3 so, a on the other hand, to be mechanically fixed to the support 2 in a precise predetermined position and, on the other hand, to be isolated from high frequency mechanical vibrations to which the support can be subjected.
• three fastening assemblies 3 are represented solely by way of example, two of these assemblies being disposed at one end of the equipment in the raised position and transversely spaced apart from one of the while the third set is disposed at the opposite end of the equipment, centrally and in the down position.
• the number of fixing assemblies is in practice determined according to the constraints encountered in each application.
• Each fixing assembly 3 is formed of a male finger-shaped element 4 and a socket-shaped female element 5 which are carried by the support 2 and the other by the equipment 1 and which are adapted to be fitted into each other for the removable attachment of the equipment 1 on the support 2.
• the fingers 4 are integral with the support 2 and project on respective faces of it and the sockets 5 are integral with the equipment 1 and are embedded in the housing 5a provided in respective faces thereof.
• each bushing 5 comprises, as can be seen in FIGS. 2A and 2B:
• an internal ring 7 disposed inside said outer ring 6 substantially coaxially with it and being radially distant from said ring, said inner ring 7 having, in the unstressed state, a smaller inner diameter Db to the outside diameter Dd of the finger 4.
• the rings 6 external and 7 internal are made of any suitable material depending on the desired strength, in relation to each specific application.
• the rings are advantageously metallic, for example steel or aluminum alloy.
• connection means are interposed between the inner and outer rings 7 and 6.
• Radially deformable elastic means are functionally associated with the inner ring 7 to allow radial deformation and / or radial displacement of the inner ring 7 in contact with the finger 4 during their fitting together.
• filtration means are interposed between said rings 6 external and 7 internal and are suitable for filtering high frequency vibrations to which the support 2 can be subjected.
• the sleeve 5 is able to mechanically receive and hold the finger 4 in a precise preset position, at the same time that the equipment 1 is isolated from mechanical vibrations at high frequencies that the medium 2 can undergo (for example vibrations from a device such as a vehicle on which the support is itself fixed).
• the inner ring 7 is circumferentially discontinuous and formed of a plurality of sections juxtaposed circumferentially; in practice, it can be provided in a simple manner that the inner ring 7 is formed of two inner half-rings 7a as shown in Figure 2A and Figures 3 to 6 and 7A. The respective ends facing each other of these two half-rings 7a are spaced from each other by an interval d so as to allow a radial displacement of one and / or two half-rings 7a.
• a simple structure of the sleeve consists in that the connecting means and the filtering means are combined with the elastically deformable means in the radial direction, so that the filtration function of the high frequency mechanical vibrations and the connection function of the two rings 6, 7 with a capacity to accompany the radial deformations that must be able to undergo the inner ring 7 are provided by the or the same organs.
• the elastic means deformable in the radial direction, interposed between the two rings 6, 7 comprise a material 8 which is elastically deformable in the radial direction, such as an elastomer whose characteristics will be chosen as a function, in particular, of the frequency or frequencies to be filtered, on the one hand, and of the elastic return force that the inner ring 7 must be able to exert on the finger 4 to ensure the correct positioning required of the equipment 1 on the support 2.
• the material 8 is implemented in the form of blocks 9 with dimensions and shapes, in number and with appropriate positions depending on the results to be obtained, in particular with regard to the characteristics of the mechanical connection to be provided between the rings. 6, 7.
• the material 8 is in the form of two blocks 9 in arcs of the same curvilinear extent as the two internal half-rings 7a and interposed respectively. between the two internal half-rings 7a and the outer ring 6.
• the material 8 is implemented in the form of four blocks 9 of small curvilinear extent and respectively disposed at the ends of the inner half-rings 7a, so that no material is interposed between the central parts of the inner half-rings 7a and the parts facing the outer ring 6.
• the material 8 is implemented in the form of six blocks 9 of small curvilinear extent. Four of these blocks 9 are respectively disposed in the vicinity of the ends of the half-rings 7a internal, while the other two blocks 9 are arranged in the middle of the internal half-rings 7a.
• each inner half-ring 7a is supported on the outer ring 6 by three regularly distributed blocks 9.
• a discontinuous connection is thus made between the outer ring 6 and each of the internal half-rings 7, as opposed to the continuous connection provided by the arrangement of FIGS. 2A and 2B between the outer ring 6 and the two inner half-rings 7a.
• the embodiments which have just been described above are not exclusive and it is perfectly conceivable to use an elastically deformable material shaped as a unitary or unitary tubular element. A preferred embodiment will be indicated later.
• the radially elastically deformable mechanical connection means comprise a plurality of partitions 10 interposed between the outer and inner rings 6. These partitions are preferably made of the same material as the rings, and it is simple that they are integral with the two rings: the two rings 6, 7 joined by the partitions 10 then form a monobloc structural assembly.
• these partitions 10 represents a compromise: they must be sufficiently sized to be able to contribute effectively to the mechanical connection of the two rings 6, 7, while in addition they must be dimensionally reduced to a minimum so as to minimize the effect of high-frequency vibration transmission bridge from the inner ring 7 to the outer ring 6; to this end, not only the partitions 10 must have a thickness as small as is possible, but also longitudinally discontinuous partitions may be provided.
• the partitions 10 extend substantially radially between the two rings 6, 7.
• four partitions 10 are provided in the vicinity of the four ends of the two half-rings respectively. 7a internal.
• the curvilinear space defined between each internal half-ring 7a, the two partitions 10 which are integral therewith and the portion of the outer ring 6 framed by the two partitions 10 is filled with a block 9 of material 8.
• This arrangement can thus be be considered equivalent to that shown in Figures 2A, 2B wherein the mechanical connection means of the rings 6, 7 are reinforced by the partitions 10.
• each partition 10 is no longer radial as in the arrangement of Figure 5, but substantially inclined relative to the radial direction, for example about 45 °.
• each partition 10 is able to lie between the two rings 6, 7 when the ring 6 tends to be brought closer to the ring 7 under the action of an external force (action of the finger 4).
• action of the finger 4 action of the finger 4
• each external half-ring 7a is associated with three partitions 10, while two blocks 9 of material 8 are interposed between the outer half-ring 7a and the inner ring 6 in the two volumes defined by the three partitions 10, the outer half-ring 7a and the portion of the inner ring 6 defined between the two end walls.
• FIG. 7A, 7B is illustrated another embodiment which differs substantially from those just exposed.
• the outer and inner rings 6 are secured by partitions 10 and these partitions 10 extend substantially radially, in the same manner as has already been presented above with reference to FIG.
• no material 8 is put in place between the two rings 6, 7.
• the inner ring 7 has, on its inner face, a plurality of lamellae 11 extending generally substantially parallel to the axis of the ring 7; these strips 11 are elastically deformable and held elastically curved longitudinally with their convexity turned towards the inside of the ring 7.
• the slats are divided into two groups forming two combs 12 arranged head to tail, with their respective interleaved slats, which are retained axially against two shoulders 13, turned towards one of the other, provided on the inner face of the ring 7, as shown in Figure 7B.
• Figures 8A, 8B and 8C of the accompanying drawings which show a preferred embodiment of a socket arranged in accordance with the invention.
• the inner ring 7 is in the form of a tubular monobloc piece of substantially circular section, in particular metal. It comprises non-emergent longitudinal slots 14 which extend alternately from the two opposite ends 7a, 7b of the ring 7. Preferably, these slots 14 are evenly distributed around the periphery of the ring 7. In the exemplary embodiment 8A-8C, the slots 14 are four in number, mutually offset by 90 ° and therefore two to two diametrically opposed. Two diametrically opposed slots 14 open on the same end of the inner ring 7. This geometry conferred on the inner ring 7 makes it possible to ensure homogeneous clamping of the corresponding finger 4 over the entire length thereof, avoiding the cone effect generated by the traditional blade structures all connected at the same end.
• the internal ring 7 thus arranged is compatible with pre-existing "degreased" fingers (cylindrical fingers on which flats are made to limit the effect of the hyperstatism).
• the elastically deformable material 8 is a silicone-type elastomer whose Shore hardness is greater than about 40 Shore A and the Young's modulus less than 2.5 Gpa.
• This material is shaped as a unitary or unitary tubular element of substantially circular cross section, having a thickness, depending on the application, between substantially a few tenths of a millimeter and a few millimeters. This material is adhered to the respective faces vis-à-vis the two rings 6 external and 7 internal. A structural connection is thus made between the three parts, which is suitable for allowing the damping of vibrations at low and high frequencies up to approximately 10,000 Hz which are filtered without generating parasitic shocks at the interface, while guaranteeing a stable return to the rest position.
• the outer ring 6 may preferably comprise an annular flange 16 of radially inward extent, which is thus adapted to constitute an axial bearing surface for the elastically deformable material 8.
• this flange 16 remains spaced axially of the corresponding end 7a of the inner ring 7.
• the outer and inner rings 6 are shaped so that, during the extraction of the sleeve 5 from its housing or its insertion into the housing, the shear stress of the elastically deformable material 8 is reduced to a minimum.
• This arrangement also ensures the relative retention of the two rings in case of degradation of the elastically deformable material 8.
• this arrangement avoids the axial flow of the material during radial deformations.
• the outer ring 6 may comprise, at its outer end 6a, a flange 17 of radially outward extent which forms a mounting flange, which can receive holes 18 for fixing screws, facilitating the axial positioning. of the bushing 5 when it is inserted into its housing (the flange 7 forming an axial stop) as well as the securing of the bushing 5 to the equipment 1.
• the bushing 5 thus arranged constitutes an easily removable autonomous component.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Vibration Prevention Devices (AREA)
• Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38858954

Family Applications (1)

Country Status (3)

Family Cites Families (5)

• 2007
  • 2007-05-22 FR FR0703620A patent/FR2916497B1/fr not_active Expired - Fee Related
• 2008
  • 2008-05-22 EP EP08805831A patent/EP2148992A2/de not_active Withdrawn
  • 2008-05-22 WO PCT/FR2008/050886 patent/WO2008152278A2/fr not_active Ceased

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events