FR2869082A1 - Anti-vibrating support for suspension system, has body interposed between outer and inner frames, where outer frame has lower end provided with stop that projects in direction opposite to direction in which frames are axially moved - Google Patents

Abstract

The support has an elastomer body (10) delimited along a central axis (Z) by upper and lower end sides (20, 22) and delimited radially by an inner wall (18) and an outer wall (16). The body is interposed between inner and outer frames (26, 28). The frame (28) has a lower end (28a) provided with an elastomer stop (30) that projects in a direction opposite to direction in which the frames are axially moved. An independent claim is also included for a vehicle comprising a suspension system with an anti-vibrating support.

Description

ANTI-VIBRATION SUPPORT,

  SUSPENSION HAVING SUCH A SUPPORT

  AND VEHICLE COMPRISING SUCH A SUPPORT

  The present invention relates to antivibration mounts intended especially but not exclusively to motor vehicles.

  More particularly, the invention relates to an antivibration support intended to be interposed between a vibrating structure element and a fixed structural element comprising an elastomeric body for damping vibrations. This body is arranged around a central axis Z, and is delimited along the central axis Z by a first end face and a second end face, and is delimited radially by an inner wall fixed on the element of vibrating structure, and an outer wall for supporting the fixed structure member. The support also comprises two reinforcements, of frustoconical shape and spaced radially, the elastomeric body being interposed between the two frames, the lower end of the outer frame being arranged radially with the lower end of the inner frame. The two armatures are offset axially in a first direction.

  Current antivibration mounts, of the type described above and arranged on a suspension of a vehicle are formed of a filtering and decoupling joint, such as an elastomer body, for damping vibrations between the suspension and the body.

  However, in this type of support, the elastomer body is constantly stressed by the movements of the spring and the cylinder of the suspension, which has the effect of reducing its resistance in endurance.

  The present invention is intended to overcome these disadvantages.

  For this purpose, according to the invention, an antivibration support of the kind in question is characterized in that the lower end of the outer frame is provided with an elastomeric abutment which projects in a second direction opposite to the first direction.

  Thanks to these provisions, the damper has a better resistance in endurance, because the abutment cooperates with a counterstay to limit the compression of the elastomer body vis-à-vis large amplitude movements.

  In various embodiments of the method according to the invention, one or more of the following arrangements may also be used: the lower end of the outer armature extends into the abutment; the elastomer body is annular; the abutment is formed in one piece with the elastomer body; - The stop is annular.

  Furthermore, the invention also relates to a vehicle suspension intended to connect a wheel to a vehicle body comprising an antivibration support according to one of the preceding claims, a jack comprising a rod parallel to the central axis Z and having a connected end. at the vehicle body, a spring surrounding the cylinder, and fixed to the rod of said cylinder.

  According to other features: the suspension comprises a spring support cup fixed to the rod of the jack, the spring comprising an upper end which bears against the spring support cup; - The cylinder has a bearing secured to the rod and on which is mounted the elastomeric body; - The inner frame is formed of a circular portion disposed around the bearing and a folded portion disposed above the bearing.

  The invention also relates to a vehicle comprising at least one suspension equipped with a support according to the invention.

  Other features and advantages of the invention will emerge during the following description of one of its embodiments, given by way of non-limiting example, with reference to the appended figures for which: FIG. comprising a support according to the invention, - Figure 2 shows the support in perspective with a section along two perpendicular planes.

  In the following description, it will be adopted in a non-limiting manner an upper and lower orientation, according to the arrangement of the figure.

  The support as shown in Figure 2 may be disposed between a fixed structure element such as the body of a vehicle and a vibrating structure element such as a suspension of a vehicle. The support connects the train of the vehicle to the body so as to damp the vibrations from the unevenness of the road and transmitted by the wheels to the suspensions.

  The support comprises an annular elastomeric body 10 around a central axis Z which is defined by a rod 12 of the vibrating structure element 14. This body 10 is delimited radially by an outer wall 16 and an inner wall 18, and is delimited along the central axis Z by a first upper end face 20 and a second lower end face 22. The elastomer body 10 is fixed to the rod 12, for example by means of a bolt (not shown ) located above said elastomeric body and below the cup 38 which will be described below.

  The outer wall 16 is spaced radially and is substantially parallel to the inner wall 18. It supports the body 24. The support has a frustoconical shape, the diameter of the second end face 22 is greater than the diameter of the first face d end 20.

  The elastomeric body 10 comprises inner and outer frustoconical shaped frames 26 radially spaced so that the lower end 28a of the outer frame 28 is arranged radially with the lower end 26a of the inner frame 26 .

  The elastomer body is interposed between the two plates 26, 28 as shown in FIG. 2. The plates 26, 28 each have an opening 29 provided for the passage of the elastomer during the molding step.

  These reinforcements 26, 28 stiffen the elastomer body 10 so that the elastomeric body 10 can withstand the radial load of the body 24 and withstand the longitudinal stresses transmitted by the rod 12 without excessive deformation. The armatures 26, 28 are axially offset in a first direction, so that the lower end 28a of the outer armature 28 is disposed in a plane greater than the plane defined by the lower end 26a of the inner armature 26 .

  The lower end 28a of the outer frame 28 is provided with an elastomeric stopper 30 which projects in a second opposite direction to the first direction. As shown in Figure 2, the end of the outer armature is extended in the stop 30. The stop 30 is annular. It can be made in one piece with the elastomeric body 10, or be reported thereto.

  Thus, when the amplitude of the vibrations increases, the vibrating structure element 14 bears on the abutment 30 protruding, and dampens the vibrations. This stop 30 makes it possible to obtain greater progressivity and makes it possible to avoid a stiffening of the elastomer body 10 which can no longer absorb the vibrations.

  In FIG. 2, the support is applied to a vibrating structure element 14 represented by a suspension of a vehicle 31. The support makes it possible to connect the train of the vehicle 31 to the body 24. The suspension is disposed in a vehicle 31 substantially in the direction indicated by the dashed line in Figure 1.

  The suspension is mounted between the wheel 33 of the vehicle and the body 24.

  This suspension consists in part of a jack 32, mounted on a rod 12, a spring 34 surrounding the cylinder 32 and a spring support cup 36 disposed on the upper part of the spring 34, and a cup of rebound 38. The body 24 is held on the outer wall 16 of the elastomer body 10, by the compression force of the spring 34 which holds the antivibration support pressed against the body 24. For this the body 24 has a surface of complementary shape to the wall 16 of the elastomeric body 10 with which it comes into contact. Part of the body is disposed between the rebound cup 38 and the elastomer body 10 with a clearance allowing the suspension to move relative to the body.

  Thus, when one of the wheels of the vehicle is subjected to vibrations of great amplitude, for example when it passes through a hole in the road, the rebound cup 38 maintains the suspension 14 by resting on the body 24.

  The support is put in place on the suspension 14 by fixing it on the rod 12 of the jack 32 above the spring 34. In the rest position, that is to say when the system is not subject to any vibration, the support is arranged so that the stop 30 is opposite the spring support cup 36, without being in contact with the spring support cup 36.

  When the suspension 14 is subjected to vibrations of small amplitude, it is the elastomeric body 10, fixed by its internal wall 18 on the rod 12, 2869082 6 which damps the vibrations emanating from the jack 32 of the suspension 14.

  When the amplitude of the vibrations increases, for example, during major shocks due to retarders, the jack 32 and the spring 34 are subjected to greater displacements. The spring 34 moves towards the spring support cup 36, which then comes into contact with the abutment 30 projecting from the elastomer element 10. The stop 30 makes it possible to damp the large amplitude vibrations transmitted by the spring 34. The elastomer body 10 is then less stressed.

  The protruding stop 30 makes it possible to obtain controlled progressivity. In addition it is possible to adjust the damping effected by the stop 30 independently of that of the body 10.

  The protruding stop 30 also makes it possible to adjust the stroke in saturation, that is to say to avoid the stiffening of the support, thanks to its geometrical shape.

  The abutment 30 may have different shapes: such as slots or cavities which make it possible to obtain different stiffnesses, and therefore different deformation and damping capacities.

  According to a variant of the invention the suspension also comprises a bearing 40 attached to the rod 12 of the cylinder 32, when it is suspension of a front wheel of a vehicle. The bearing 40 makes it possible to make the spring 34 work on the central axis Z and to prevent it from working in torsion when the direction is angularly biased. If the jack 32 has a bearing 40, the support is directly attached to the bearing 40. In this case the inner armature 26 is formed of a circular portion disposed around the bearing 40 and a folded portion disposed around the bearing 40 , so as to make the whole thing solid.

  Thus the antivibration support obtained has endurance characteristics superior to current supports of the same type.

Claims (10)

  An antivibration mounts to be interposed between a vibrating structure member (14) and a fixed structural member (24) comprising: an elastomeric body (10) for damping vibrations, which body (10) is disposed around a central axis (Z), said body being delimited along the central axis (Z) by a first end face (20) and a second end face (22), and said body being delimited radially by a internal wall (18) fixed on the vibrating structure element (14), and by an outer wall (16) for supporting the fixed structural element (24), - two frustoconical reinforcements (26, 28) and spaced radially, the elastomeric body (10) being interposed between the two armatures (26, 28), the lower end (28a) of the outer armature (28) being arranged radially with the lower end (26a) of the inner armature {26), the two armatures (26, 28) being axially offset t in a first direction, characterized in that the lower end (28a) of the outer frame (28) is provided with an abutment (30) of elastomer which projects in a second direction opposite the first direction.   2. antivibration support according to claim 1, wherein the lower end (28a) of the outer armature (28) extends in the stop (30).   3. Antivibration support according to one of the preceding claims, wherein the elastomeric body (10) is annular.   4. Antivibration support according to one of the preceding claims, wherein the stop (30) is formed integrally with the elastomeric body (10).   5. Antivibration support according to one of the preceding claims, wherein the stop (30) is annular.   6. A vehicle suspension for connecting a wheel to a vehicle body, comprising: - an antivibration support according to any one of the preceding claims, - a jack (32) having a rod (12) parallel to the central axis (Z), this rod having an end intended to be connected to the vehicle body, - a spring (34) surrounding the cylinder (32) and fixed to the rod (12) of said cylinder.   7. Suspension of a vehicle according to claim 6 further comprising a spring support cup (36) fixed to the rod (12) of the jack, the spring (34) comprising an upper end which bears on the cup of spring support (36).   8. Suspension according to claims 6 to 7, wherein the cylinder (32) comprises a bearing (40) secured to the rod (12) and on which is mounted the elastomeric body (10).   9. Suspension according to claim 8, wherein the inner frame (26) is formed of a circular portion disposed around the bearing (40) and a folded portion disposed above the bearing (40).   10. Vehicle comprising at least one suspension according to one of claims 6 to 9, the end of the rod (12) of the jack being fixed to the vehicle body.