FR2913743A1 - Hydraulic antivibratory support device for vehicle, has partition centered on one of walls of central armature with respect to which partition is displaced axially or radially, by its respective peripheral edges - Google Patents

Abstract

The device (1) has a transversal intermediate partition (30) arranged between transversal end walls (6a, 6b), and dividing a housing (31) into upper and lower chambers (31a, 31b). The partition is centered on one of the walls of a central rigid cylindrical armature (10) with respect to which the partition is displaced axially or radially by its respective peripheral edges, where one of the edges is fixed axially with sealed radial clearance in a radial groove (29) of a peripheral rigid cylindrical armature (11). One of the edges has a lip made of elastically deformable material i.e. elastomer.

Description

The invention relates to hydraulic antivibration devices for

  vehicles. Such a device, generally interposed between the damper rod of the vehicle and the chassis thereof, reduces the nuisance caused by vibration or oscillations of said rod relative to the vehicle frame, during the movement of the vehicle.

  A first hydraulic antivibration device is described in patent EP 0 416 381 A1. This device, illustrated in FIG. 1, is intended to be interposed between the damper rod of a vehicle and the chassis of this vehicle. In this Figure 1, there is a central frame 37, annular in shape, having on its outer side wall 38 a rib 39. This armature 37 is adapted to be threaded on a damper rod, not shown, and housed in a frame 40 device integral with the frame, cylindrical. Said armature 37 is coated on its outer lateral wall 38 with a damping element 41, such as an elastomer. This element 41 has protrusions enabling the armature 37 to be partially but elastically connected to the peripheral armature 40, this armature 40 being formed of an upper part 42 and a lower part 43, these parts being complementary and interdependent. Thus, a chamber 44 is formed between said two plates 37 and 40. This chamber 44, filled with fluid, comprises a narrowing 45 of the space between said two plates 37, 40, this narrowing 45 being formed by the rib 39, also coated with the damper element 41. Thus, during axial movement of the rod, the fluid passes through the constriction 45, to pass from the upper part of the chamber 44 to the lower part of this chamber 44, and vice versa.

  A second hydraulic antivibration device is described in document EP 0 971 153 A1. This device, illustrated in FIG. 2, is intended to be interposed between a damper rod 46 of a vehicle and the chassis 47 of said vehicle. This device comprises a central armature 48, of generally annular shape, threaded on the damper rod 46 and integral in displacement thereof. This central frame 48 has a rib 49 on its outer side wall. Said armature 48 is housed in a peripheral armature 50, said armature 50 being integral with the frame 47. Said armature 48 is elastically connected to said armature 50 by means of deformable elements 51, 52, 53. Thus, two sealed chambers 54, 55 are formed in the space between the outer side wall of the frame 48 and the inner side wall of the frame 50, these two chambers 54, 55 being filled at least partially with fluid. Two orifices 56, 57 through are formed in said armature 48, so as to communicate the two chambers 54, 55 between them. Each orifice (56; 57) is closed by unidirectional sealing means (58; 59), which is formed by a spring loaded ball (60; 61) (62; 63). Thus, the orifice 56 closed by the ball 60 loaded by the spring 62 allows the passage of fluid from the lower chamber 55 to the upper chamber 54, during a downward movement of the rod 46 with respect to the frame 47. The orifice 57 closed by the ball 61 loaded by spring 63 allows, for its part, the passage of the fluid from the upper chamber 54 to the lower chamber 55, during an upward movement of the rod 48.

  This hydraulic antivibration device has a drawback related to the difficulty of producing such a device.

  None of these two examples of hydraulic antivibration device is entirely satisfactory.

  An object of the invention is to provide a hydraulic antivibration support device for a vehicle, able to move radially and axially according to the relative movements of a damper rod and the chassis of a vehicle.

  Another object of the invention, in a hydraulic antivibration support device with sealed housing separated in two chambers by a partition, is to provide a partition ensuring a bidirectional transfer of fluid between these two chambers, during a displacement of a rod vehicle damper with respect to the chassis of this vehicle.

  For this purpose, the subject of the invention is a hydraulic antivibration support device intended to be interposed between a damper rod and a vehicle chassis for elastically connecting the rod and the chassis, in particular to dampen the transfer of the rod. to the chassis of the vibrations and / or oscillations imposed on the rod, this device comprising: - a generally rigid central cylindrical reinforcement delimiting an axial passage inside which can be threaded the damper rod to which the central armature is adapted to be fixed, a rigid peripheral armature surrounding and arranged coaxial with said central armature, the peripheral rigid armature being adapted to be fixed to the frame, two so-called end transverse walls sealingly connecting the two armatures and forming therewith a sealed annular housing, at least partially filled with fluid, 15 - a transverse intermediate partition available between the two transverse end walls and dividing said housing into two chambers, the transverse end wall of each chamber being made of a deformable material so that a relative movement of the two frames in a first direction during their vibration relative compresses the first chamber and expands the second chamber and a relative movement of the two armatures in a second opposite direction during their relative vibration expands the first chamber and compresses the second chamber, characterized in that said partition is, by the one of its peripheral edges, centered on the wall constituting one of the armatures, with respect to which it is axially displaceable, and by its other peripheral edge mounted axially fixed and with radial clearance sealed on the other armature, relative to which it is radially displaceable.

  Preferably, the partition is provided with at least one, preferably a plurality, of closable fluid circulation passages or not.

  Preferably, the peripheral edge ensuring the centering of said partition on the wall constituting one of the reinforcements has over a portion of its length, a support bead on said wall. On the other part of its length, the peripheral edge has an elastically deformable lip allowing the passage of fluid from one of the chambers to the other chamber, and vice versa. On said peripheral edge ensuring the centering of the partition on the wall constituting one of the reinforcements, are alternately arranged zones carrying said bead and areas bearing said lip. Said lip is made of elastomer by overmolding on said partition.

  Preferably, said other peripheral edge is mounted with sealed radial clearance in a radial groove of said other reinforcement.

  The invention will be better understood, and other objects, details, features, and advantages thereof will become more clearly apparent from the following detailed explanatory description of several embodiments of the invention given as examples. purely illustrative and non-limiting example, with reference to the accompanying drawings.

On these drawings

  FIG. 1 is a sectional view of a hydraulic antivibration device according to the prior art,

  FIG. 2 is a sectional view of a hydraulic antivibration device according to the prior art, FIG. 3 is a sectional view of a hydraulic antivibration support device, in the rest position, according to a first embodiment of FIG. invention,

  FIG. 4 is a top view of a transverse intermediate partition belonging to the hydraulic antivibration support device, according to a first embodiment, FIG. 5 is a view, in cross-section AA of FIG. transverse intermediate partition,

  FIG. 6 is a diagrammatic sectional view of the first embodiment of the hydraulic antivibration support device, in the rest position, corresponding to FIG. 3,

  FIG. 7 is a diagrammatic sectional view of the first embodiment of the hydraulic antivibration support device, in which the rod is in extreme radial position with respect to the reinforcement,

  FIG. 8 is a diagrammatic sectional view of the first embodiment of the hydraulic antivibration support device, in which the rod has been moved axially relative to the armature, FIG. 9 is a diagrammatic sectional view of a second embodiment of FIG. realization of the hydraulic antivibration support device, in the rest position,

  FIG. 10 is a diagrammatic sectional view of the second embodiment of the hydraulic antivibration support device, in which the rod is in extreme radial position with respect to the armature,

  Figure 11 is a schematic sectional view of the second embodiment of the hydraulic antivibration support device, in which the rod has been displaced axially with respect to the armature.

  FIG. 3 shows a hydraulic antivibration support device 1, according to a first embodiment, interposed between a damper rod 2 and a vehicle chassis 3 for elastically connecting said rod 2 and the chassis 3 for the purpose of damping the transfer. , from the shank 2 to the frame 3, vibrations or oscillations imposed on the shank 2. The shank 2 has a lower portion 2a, of greater diameter than that of the shank 2, connected to said shank 2 by a radial shoulder 22 . Pressed on this radial shoulder 22, is positioned a cup 12 of shock abutment. This cup 12, of generally cylindrical shape, has a lateral surface coaxial with the lower portion 2a of the rod 2. Between the cup 12 and the lower portion 2a of the rod 2 is generally inserted a shock stop, not shown.

  An armature 10, called central, rigid, is made symmetrically with respect to its transverse median plane. This armature 10, of generally cylindrical shape, has a through hole arranged axially. Said armature 10 has a bulge 17 formed on its outer surface and positioned in its median part. This armature 10 is formed of two complementary parts 10a, 10b coaxial and can be secured together by a fixing means, such as gluing. The portion 10b of the armature 10 on the one hand forms the cylindrical body of said armature 10, and on the other hand, a lower portion 17b of the bulge 17. The portion 10a, slipped on the portion 10b, and in support on a radial shoulder 28 formed on the outer peripheral wall of the portion 10b, constitutes an upper portion 17a of said bulge 17. When the portion 10a bears on said radial shoulder 28, the lower surface of the portion 17a of the bulge 17 is spaced apart of the upper surface of the portion 17b of said bulge 17. This space forms a peripheral radial groove 29 on the armature 10, adapted to house a partition 30. On either side of the bulge 17, the central armature 10 presents two substantially cylindrical ends, each of these ends for receiving by fitting a part 4. The central armature 10 is intended to be fitted on the rod 2, 25 the lower end of this armature 10 coming in bearing on the radial shoulder 22 of the rod 2.

  Two parts 4 of the device 1 hydraulic antivibration support being substantially identical, for this purpose, only one will be described. The part 4 is made of an elastically deformable material. This part 4 is formed on the one hand of a drum 9 in the form of a hollow cylinder and on the other hand, of a transverse wall 6.

  The barrel 9, having a generally hollow cylindrical shape, forms, from its inner surface, a through orifice 5. This orifice 5 delimits an axial passage x axis in order to thread the piece 4 on one of the substantially cylindrical ends of the central frame 10.

  The transverse wall 6 extends radially from one of the ends of the barrel 9 and forms a general O-ring surface. This toric surface, forming the transverse wall 6, is bent to give it in cross section, a general arc shape. In addition, this transverse wall 6 terminates in an outer peripheral edge 7 which is preferably in circular form.

  The part 4 formed of the barrel 9 and the transverse wall 6 is delimited on the one hand by the free edge of said wall 6, said outer peripheral edge 7, and on the other hand by the free edge of the barrel 9. said inner peripheral edge 8.

  Each piece 4 is threaded, on one of the two substantially cylindrical ends of the central frame 10 by means of the orifice 5 formed by the barrel 9 of each of the two pieces 4. Thus, each barrel 9 surrounds one of said 20 ends. The parts 4 are spaced from each other by the bulge 17 formed on the central frame 10. In the threaded state of the parts 4 on the central frame 10, the upper part 4 of the bulge 17 is referenced 4a, while the lower part 4 of the bulge 17 is referenced 4b. Similarly, the references of the elements composing the part 4a are followed by the letter a 25 while those of the elements composing the part 4b are followed by the letter b. The parts 4a, 4b are arranged so that the convexity of the surface forming the transverse wall 6a is opposite the convexity of the surface forming the transverse wall 6b. In the mounted state on the central frame, the inner circumferential edge 8b of the part 4b bears against the abutment cup 12 while the inner circumferential edge 8a of the part 4a is retained axially by a 14 cup limitation that will be described later.

  An armature 11, called peripheral, is of generally annular shape. This armature 11, rigid, is formed, for example, a lower portion 11b and an upper portion 11a, coaxial with each other. These two parts 11a and 11b can be fixed together, for example by welding, to form the armature 11. Said armature 11 comprises, on the upper edge of its inner peripheral wall, a notch 19a and, on the lower edge its inner peripheral wall a notch 19b. The notches 19a and 19b are arranged opposite. The armature 11 is arranged coaxially with the damper rod 2 and positioned at a distance around the central armature 10.

  When the part 4a is in the mounted state on the central frame, the outer peripheral edge 7a cooperates with the notch 19a of the frame 11. Similarly, the outer peripheral edge 7b cooperates with the catch 19b when the piece 4b is mounted on said frame 10. Thus, each piece 4 forms a bridge-type connection between the central frame 10 and the peripheral frame 11. A ring 36 is disposed, coaxially with said armature 11, on the inner wall of this armature 11 between the notches 19a and 19b. This ring 36 maintains the edges 7a, 7b external peripherals of the parts 4a, 4b in their notches 19a, 19b. The two parts 4a, 4b, each connected to the central frame 10 and the peripheral armature 11, define an annular housing 31, sealed. This sealed housing 31, at least partially filled with fluid, such as an oil, is defined by the outer peripheral surface of the central frame 10, the inner peripheral surface of the peripheral frame 11 and the transverse walls 6a, 6b respectively parts 4a, 4b.

  Figure 4 shows the intermediate partition, transverse, in plan view. The wall 30, called transverse intermediate, housed in the groove 29, has the general shape of a recessed disk at its center. This partition 30 has, on its outer peripheral edge, notches, preferably angularly distributed uniformly, these notches forming passages 32 of fluid circulation. Each of said passages 32 is equipped with an elastically deformable closure means, such as a lip 34. This lip 34 is preferably made from an elastomer and overmolded on the outer peripheral edge forming a bottom of each of passages 32 of said partition 30 (Figure 5). The outer peripheral edge of said partition 30 outside the fluid circulation passages 32 is provided with a bead 33 bearing against the ring 36, not shown in FIG. 4.

  The partition 30, housed in the groove 29 of the central frame 10, as shown in FIG. 3, is secured axially to the latter by means of the parts 17a and 17b of the bulge 17. The partition 30 divides the housing 31 in two chambers, one 31a upper, the other 31b lower. Said partition 30 has an inside diameter greater than the inside diameter of the radial groove 29 of said armature 10, and is able to move radially in said groove 29. Thus, a radial clearance of said partition 30 with respect to the armature 10 is authorized. In addition, a seal is provided between the partition 30 and the flanks of the groove 29.

  In the state mounted on the armature 10, the peripheral edge of the partition 30, having a support bead 33, is in contact on the inner surface of the ring 36, housed in the peripheral armature 11. The support bead 33 ensures the centering of the partition 30 and the guiding thereof along the inner surface of said ring 36, during the displacement of the damper rod 2 with respect to the frame 3. state, the lips 34 of the partition 30, licking the inner surface of the ring 36, provide a relative seal between the partition 30 and the ring 36. During an axial displacement of the rod 2 relative to the frame 3, said lips 34, deforming, allow the transfer of fluid between the chambers 31a and 31b.

  The peripheral armature 11 includes a flange 24 extending the upper edge of said armature 11 and extending radially outwardly thereagainst thereof. Leaning on the flange 24, is disposed a ring 20, substantially circular whose cross section is shaped angle. This ring 20 is positioned on the upper surface of said flange 24 so as to form, in cooperation with the peripheral outer surface 10 of the peripheral armature 11, a housing adapted to receive the upper washer 15a of a bearing 15, while the lower washer 15b of the bearing 15 is held in abutment on a not shown spring. This bearing 15 is intended to facilitate the pivoting of said spring around the x axis.

  The outer surface of the ring 20 is coated with an elastically deformable element 26, of the elastomer type. The upper edge of the peripheral armature 11, which is not covered by the crown 20, is coated with an element 25a. The lower edge of said armature 11 is coated with an element 25b. These two elements 25a and 25b are made of an elastically deformable material, such as an elastomer. On the element 26, the frame 3 is arranged, this element 26 providing an elastic connection between the ring gear 20 and the frame 3.

  A cup 14, said limitation, has a general shape of attitude and has 15 a central orifice. This orifice allows the cup 14 of limitation to be threaded on the damper rod 2. This cup 14 is disposed in abutment on a surface formed by the upper edges of the central frame and the part 4a. This cup 14 is held axially fixed on said surface by means of a nut 16 cooperating with a thread formed on the upper zone 20 of the damper rod 2. This nut 16 makes it possible to make integral in displacement the various parts interposed between the radial shoulder 22 of the rod 2 and this nut 16.

  In support of this nut 16, is disposed a cup 13, said flange. This cup 13 affects the shape of a plate. The lower peripheral edge of said cup 13 is provided with a bead 27 made of elastically deformable material, of the elastomer type. The rim cup 13 is held axially fixed on said rod 2 between the nut 16 and a nut 21, also screwed onto said rod 2. The following FIGS. 6, 7, 8 are intended to represent, in a schematic manner, according to the first embodiment of the invention, the behavior of the partition 30 during the displacement of the damper rod 2 relative to the chassis 3. In this first embodiment, the partition 30 is centered on the peripheral armature 11 and is movable radially with respect to the central frame.

  Figure 6 schematically shows the device 1 hydraulic antivibration support as shown in Figure 3. The device 1, as shown, is in the rest position. In this figure, the central armature 10 has the shape of a hollow cylinder provided at both ends of a flange 24 and provided with a bulge 17 formed at the median plane of said armature 10 and extending over the around it. In this bulge 17, is formed a radial groove 29, extending on the periphery of said armature 10. This armature 10, threaded on the damper rod 2, is integral in displacement thereof, bearing on the radial shoulder 22 of said rod 2 and the nut 16 screwed onto the same rod 2. 15 The rigid peripheral armature 11 is arranged coaxially at a distance around said central armature 10.

  The partition 30, forming a recessed disk, is housed in the groove 29. The inside diameter of said partition 30 being greater than the inside diameter of the groove 29, a radial clearance between the armature 10 and said partition 30 is, thus, assured. The partition 30 is provided on its outer peripheral edge with a support bead 33. In the mounted state, the bead 33 of the partition 30 is in contact on the inner wall of the peripheral armature 11, so as to ensure that the partition 30 is centered with respect to said armature 11.

  Figure 7 shows the device 1 hydraulic antivibration support in an extreme radial position of the damper rod 2. In this position, the partition 30 is moved inside the groove 29 while the outer peripheral edge 30 of the partition 30 remains in contact with the inner wall of the peripheral armature 11. FIG. 8 shows the hydraulic antivibration support device 1, when the damper rod 2 has been displaced upwards, along the x axis, with respect to the peripheral armature 11. In this position, the partition 30 follows the axial movement of the rod 2, and ensures the centering of the partition 30 on the inner wall of the armature 11, via the bead 33.

  The following Figures 9, 10, 11 are intended to show, schematically, according to a second embodiment of the invention, the behavior of the partition 30 when moving the damper rod 2 relative to the frame 3 In this second embodiment, the partition 30 is centered on the central frame, by means of a bead 33 formed on areas of the inner peripheral edge of said partition 30. The zone of the inner peripheral edge does not have bead 33, forms a fluid circulation passage. On the inner peripheral edge of this fluid flow passage, is mounted an elastically deformable lip adapted to deform to let the fluid. In addition, the outer peripheral edge of said partition 30 is housed, with radial clearance, in the groove 29, formed in the peripheral armature 11.

  Figure 10 illustrates the damper rod 2 moved radially relative to the peripheral armature 11. The partition 30 is moved in the groove 29 of the peripheral armature 11, while the bead 33 of said partition 30 ensures the centering of said rod 2 on the outer wall of the central armature.

  In the position illustrated in FIG. 11, the partition 30 follows the axial movement of the rod 2, and ensures the centering of said rod 2 on the outer wall of the armature 10, via the bead 33.

  Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited and that it includes all the technical equivalents of the means described and their combinations if they enter in the context of the invention.

Claims (7)

  1. Device (1) hydraulic antivibration support intended to be interposed between a damper rod (2) and a vehicle frame (3) for elastically connecting the rod (2) and the frame (3) for the purpose of damping the transfer, from the rod (2) to the frame (3), of the vibrations and / or oscillations imposed on the rod (2), this device (1) comprising: - a generally rigid central cylindrical armature (10) delimiting an axial passage at inside which can be threaded the damper rod (2) to which the central armature (10) is adapted to be fixed, - a rigid peripheral armature (11) surrounding and arranged coaxial with said central armature (10), this rigid peripheral armature (11) being able to be fixed to the frame (3), two end-transverse walls (6a, 6b) sealingly connecting the two armatures (10, 11) and forming therewith a sealed annular housing (31) filled at least partially with luide, - a transverse intermediate partition (30) disposed between the two transverse end walls (6a, 6b) and dividing said housing (31) into two chambers (31a, 31b), the wall (6a; 6b) of each chamber (31a; 31b) being made of a deformable material such that a relative movement of the two plates (10, 11) in a first direction during their relative vibration compresses the first chamber ( 31a) and expands the second chamber (31b) and a relative movement of the two armatures (10, 11) in a second, opposite direction during their relative vibration expands the first chamber (31a) and compresses the second chamber (31b). , characterized in that said partition (30) is, by one of its peripheral edges, centered on the constituent wall of one of the reinforcements (10; 11), with respect to which it is axially displaceable, and by its another peripheral edge mounted axially fixed and with radial clearance sealed on the other armature, with respect to which it is movable radially. 13   2. Device (1) antivibration hydraulic support according to claim 1, 25characteriser in that the partition (30) is provided with at least one, preferably a plurality of passages (32) of fluid circulation closable or not.   3. Device (1) antivibration hydraulic support according to one of claims 1 and 2, characterized in that the peripheral edge ensuring the centering of said partition (30) on the wall constituting one of the armatures (10; ) has on a part of its length, a bead (33) bearing on said wall. 10   4. Device (1) antivibration hydraulic support according to claim 3, characterized in that on the other part of its length, the peripheral edge has a lip (34) elastically deformable allowing the passage of fluid from one of the chambers ( 31a, 31b) to the other chamber, and vice versa. 15   5. Device (1) antivibration hydraulic support according to claim 4, characterized in that on said peripheral edge ensuring the centering of the partition (30) on the wall constituting one of the armatures (10; 11), are arranged, alternately zones bearing said bead (33) and areas bearing said lip (34). 20   6. Device (1) antivibration hydraulic support according to one of claims 4 or 5, characterized in that said lip (34) is made of elastomer by overmolding said partition (30).   7. Device (1) antivibration hydraulic support according to claim 1, characterized in that said other peripheral edge is mounted with radial clear play in a groove (29) radial of said other frame. 30