FR2750190A1 - VIBRATION DAMPER, ESPECIALLY FOR MOTOR VEHICLES - Google Patents

Abstract

Vibration damper, suspension strut or the like, in particular for motor vehicles, where the vibration damper, or the suspension strut, is fixed by means of elastic supports (4) on the one hand on the vehicle body and on the other hand on a wheel guide element and where, to form each support point, the free end of a piston rod (1), a housing or the bottom of a housing is coupled to radially outwardly extending support pieces, and where these support pieces (6) are in active connection with resilient support rings (5) like rubber and where, by means of fasteners (9) , these support parts constitute the supports on the vehicle body and on the wheel guide element, where the piston rod (1) and / or the housing or the housing bottom comprises at least two elastic supports (4) arranged laterally, in which case separate elastic support rings (5), elastic like rubber , are assigned to each medium.

Description

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  The invention relates to a vibration damper, a suspension strut or the like, having a short mounting length, used in particular for motor vehicles in which the vibration damper, or the suspension strut, is fixed by means of elastic supports. , on the one hand at the vehicle body and on the other hand on a wheel guiding element. More specifically, the invention relates to a vibration damper, a suspension strut or the like, in particular for motor vehicles, in which the vibration damper, or the suspension strut, is fixed by means of elastic supports of a on the body of the vehicle and on the other hand on a wheel guiding element and in which, to form each support point, the free end of a piston rod and / or of a casing, respectively from the bottom of a housing, is coupled to support parts extending radially outwards, and in which these support parts are in active connection with elastic support rings such as rubber and in which, by means of fixing, these support pieces constitute the supports on the vehicle body and on the

wheel guidance.

  A construction of this type is known from the publication DE-OS 2 249 174, where the shock absorber is provided with elastic joints extending radially with respect to the casing and / or with respect to the piston rod, and o it is mounted, with these joints, between the vehicle body and a wheel suspension element. Preferably, the rubber support rings are arranged extending over the entire circumference, while the support shells come to bear against the rubber support rings during mounting in the vehicle, hence it

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  As a result, the elastic acting joints have a relatively high stiffness over the entire circumference, therefore in each direction. In another construction known from the publication DE-GM 1 859 436, a hinge eye is welded laterally to a cylinder tube of a single-tube vibration damper to shorten the mounting dimensions. Such a unilateral arrangement of the point of application of the force is a drawback, since a relatively large bending moment is exerted on the parts of the vibration damper, in particular on the piston rod, from where it As a result, the guide of the piston rod and the seal of the piston rod must absorb radial forces and, therefore,

  these parts are subject to significant wear.

  The object of the present invention is to produce a vibration damper, or a suspension strut, having the shortest possible mounting dimensions, a vibration damper or suspension strut whose coupling joints are simple in their structure, guarantee a problem-free assembly, present only a slight wear of the parts and ensure that the stiffness of the joints is largely adaptable to

requirements.

  This object is achieved by the invention by the fact that the piston rod and / or the casing or the bottom of the casing comprises at least two elastic supports arranged laterally, separate support rings, elastic like rubber, being associated with each support . In this way, a coupling articulation of the vibration damper is easy to assemble with an element of the vehicle and simple in its structure. Advantageously, the

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  laterally placed elastic supports are arranged symmetrically with respect to the axis of the vibration damper, so that no significant bending moment or bending moment, due to the support forces exerted on the supports, is not applied to parts of the vibration damper. Consequently, the parts of the vibration damper or of the suspension strut are not subjected to any significant wear due to a bending moment, and the construction of the joints is, with regard to the stiffness of the joints, adaptable without problem to the required values. . A construction of the supports simple in its structure and easy to assemble, is obtained in accordance with the invention, thanks to the fact that the supports arranged laterally have support discs and that the piston rod and / or the casing or the bottom of the casing is fixedly coupled to a respective support disc. In another configuration, the free end of the piston rod is fixedly coupled to a bell-shaped element, in which case this element carries the support disc. This arrangement of the support disc allows a very short mounting length, since the bell-shaped element can be configured in such a way that the end of the casing can penetrate this element. Such a short mounting length of the vibration damper or the strut is for example desirable for low-floor buses, since there is no need for space

  in the axial direction for fixing the supports.

  Advantageously, the support disc is provided with holes corresponding to the planned number of supports, holes through which the

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  fasteners extending parallel to the axis

vibration damper.

  To adapt the stiffness of the joints to the desired values, it is possible, without difficulty, according to a characteristic of the invention, to provide the support disc with several supports, for example four supports arranged symmetrically with respect to each other , in which case the fastening elements are arranged extending parallel to the axis of

the vibration damper.

  A simple and economically feasible assembly is obtained by the fact that two elastic support rings such as rubber are provided for each fastening element, which support rings are arranged on both sides of the support disc and are covered by a ring with a bent profile, o, for the passage of the fastening elements, the bent profile ring is provided with openings on its front face, and o the cylindrical end of the bent profile ring constitutes a bearing surface

  for an element coupled to the vehicle.

  To obtain a diversified stiffness of the joints on the circumference of the fastening, four supports, arranged by being distributed unevenly around the circumference, are also advantageous for the embedding joint instead of two symmetrically arranged supports, when a predetermined and desired stiffness of the joints requires it. In this way, it is possible without difficulty to obtain without problem the desired stiffness of the joints with the assembly according to the invention, and it is also possible to reduce the stiffness of the joints in the direction of travel by an appropriate arrangement of the elastic supports, for example by twisting the supports by

  relative to the longitudinal axis of the vehicle.

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  In another embodiment, two articulation eyes are arranged, according to the invention, being fixed on both sides of the piston rod and / or of the housing or of the housing bottom, in which case the axes of the articulation lie in a plane extending substantially perpendicular to the axis of the vibration damper. These articulation eyes are either fixed on the bell-shaped element coupled to the piston rod, or fixed on a disc coupled to the piston rod and / or to the housing.

or at the bottom of the housing.

  The invention will subsequently be explained in more detail using the embodiments shown in the drawing. In the drawing: Figure 1 is a longitudinal section of a construction of joints, having a short mounting length, coupled to the piston rod; Figure 2 is another embodiment of an articulated attachment of the piston rod on a vehicle element, along the section line II-II of Figure 3; Figure 3 is a top view of the construction of the joint according to Figure 2; Figure 4 is an arrangement of two articulation eyes on a bell-shaped element coupled to the piston rod; Figure 5 is a cross section of the arrangement of the articulation eyes according to Figure 4; FIG. 6 represents a vibration damper provided with articulation eyes fixed on the bottom of the casing and on a disc coupled to the piston rod. In FIG. 1, a bell-shaped element 2 is fixedly coupled to a rod 1 of the piston of a vibration damper. Element 2 in shape

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  bell carries a protective tube 3 and a support disc 6 which constitutes a part of a support 4 of an articulated construction. The fixing of the element 2 in the form of a bell on the rod 1 of the piston and the fixing of the support disc 6 on the element 2 in the form of a bell are preferably produced as solder joints. Naturally, other known types of junction, such as for example a screw connection between the bell-shaped element 2 and the rod 1 of the

piston, are possible.

  The elastic support 4 comprises two identical support rings 5, elastic like rubber, which bear, on the one hand, on the support disc 6

  and, on the other hand, on cover washers 7.

  A hole 8 in the support disc 6 is associated with each support 4, a hole through which a fixing element 9 passes, configured in the present embodiment as a screw, the axis of which is parallel to the axis of piston rod 1. To guarantee a precisely defined prior tightening of the support rings 5 when the support 4 is fixed to an element 10 of the vehicle, a spacer bush 17 is provided which carries the support rings 5 on its outside diameter and which, once mounted , is pressed, with its front faces, against the cover washers 7. The elastic support, having no reference number and arranged symmetrically with respect to the axis of the piston rod 1, has the same structure. It is possible without difficulty, when a certain articulation stiffness is required, to have several supports 4 facing each other, for example four supports 4, in which case two supports are provided, being respectively arranged so closer to each other, the spacing of the supports being chosen corresponding to the stiffness

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  articulation required. One can also obtain a modification of the articulation stiffness by an arrangement in torsion, compared to the axis

  longitudinal of the vehicle, elastic supports 4.

  The construction of a joint according to FIG. 2 differs from that of FIG. 1, essentially by the fact that the support rings 5 which are elastic like rubber, being located on both sides of the support disc 6, are housed by a ring 11 to bent profile which is provided, on its bent surface, with openings 12 corresponding to the number of supports 4. When fixing the vibration damper to the element 10 of the vehicle, the ring 11 with bent profile is pressed with the bearing surface 13 against the element 10 of the vehicle and thus defines the limit for the prestressing of the support rings 5. With the help of the section line II-II of FIG. 3, it can be seen why no support 4 is is shown on the left side of Figure 2 because, also in the case of this articulation construction, the supports are arranged symmetrically with respect to the axis of the rod 1 of the piston. Figure 3 shows in particular the case where four supports 4 being for example assigned to a point of embedding of the vibration damper, the supports 4 facing each other can be distributed unevenly along the circumference , whereby adaptation to a required articulation stiffness is possible in a simple manner. In the case of joint constructions of this type, it is also possible, without problem, to use support rings having a different or different hardness. FIGS. 4 and 5 show the construction of articulations produced by two articulation eyes 15 joined by welding to the bell-shaped element 2. These articulation eyes are

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  designed as is usual in the construction of vibration dampers and lie in a plane extending substantially perpendicular to the axis of the rod 1 of the piston. The installation in the vehicle is carried out in a manner corresponding to the usual fastenings, where only two articulation eyes are provided, by embedding point, available below the end of the piston rod. Another embodiment according to FIG. 6 shows the vibration damper, the piston rod 1 of which carries at its end a disc 16 which can be provided with an edge tucked down. In the region of this retracted edge, the articulation eyes 15 are fixed by welding so that their axes converge radially towards the axis of the piston rod 1. A hinge construction arranged on the housing or on the bottom 14 of the housing also comprises two articulation eyes 15 which are fixed

by welding on the bottom of the housing.

  In another configuration of the invention, it is possible, for example, to constitute the element 2 in the form of a bell and the support disc 6 in a single piece. This is achieved either by plastic deformation, or by manufacturing as a casting. The bell-shaped part then constitutes, with its internal surface, the housing for the protective tube. It is also not necessary, in each mounting case, for the elastic supports 4 to be necessarily arranged in an even number. Thus, in the case of a certain requirement concerning the stiffness of articulation, it may also be advisable to mount three elastic supports.

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Claims (9)

R E V E N D I C A T IONS   1. Vibration damper, suspension strut or the like, in particular for motor vehicles, in which the vibration damper, or suspension strut, is fixed by means of elastic supports on the one hand to the body of the vehicle and on the other hand on a wheel guide element and in which, to form each support point, the free end of a piston rod and / or of a casing, respectively from the bottom of a casing, is coupled to support parts extending radially outwards, and in which these support parts are in active connection with elastic support rings such as rubber and in which, by means of fasteners, these support parts constitute the supports on the vehicle body and on the wheel guide element, characterized in that the piston rod (1) and / or the casing or the bottom (14) of the casing comprises at least two elastic supports (4) laterally arranged, separate support rings (5), elastic like rubber, being associated with each support (4).   2. Vibration damper according to claim 1, characterized in that the supports (4) arranged laterally comprise support discs (6) and in that the rod (1) of the piston and / or the casing or the bottom (14) of the housing is fixed   respectively to a support disc (6).   3. Vibration damper according to   claims 1 and 2, characterized in that   the free end of the piston rod (1) is fixedly coupled to a bell-shaped element (2) and in that this element (2) carries the support disc (6). 2750190   4. Vibration damper according to one   any one of claims 1 to 3, characterized in that   that the support disc (6) is provided with bores (8) corresponding to the planned number of supports (4), bores through which engage fixing elements (9) extending parallel to   the axis of the vibration damper.   5. Vibration damper according to one   any of the preceding claims, characterized   in that, for each fastening element (9), two elastic support rings (5) such as rubber are provided which are arranged on both sides of the support disc (6) and which are covered by a ring (11) to bent profile, o the bent profile ring (11) is provided, on its front face, with openings (12) for the passage of the fastening elements (9), and o the cylindrical end of the ring (11) bent profile constitutes a bearing surface (13) for a   element (10) coupled to the vehicle.   6. Vibration damper according to one   any of the preceding claims, characterized   in that preferably four supports (4), arranged in being distributed unevenly over the   circumference, are assigned to the support disc (6).   7. Vibration damper according to claim 1, characterized in that two articulation eyes (15) are arranged by being fixed on both sides of the rod (1) of the piston and / or of the casing or of the bottom (14) of the housing, and in that the axes of the hinge eyes (15) lie in a plane extending substantially perpendicular to   the axis of the vibration damper.   8. Vibration damper according to   claims 1 and 7, characterized in that the eyes   (15) of articulation are fixed on the element (2) in   bell shape coupled to the piston rod (1).   Il 2750190 9. Vibration damper according to   claims 1 and 7, characterized in that the eyes   (15) of articulation are fixed on a disc () coupled to the rod (1) of the piston and / or to the housing or to the bottom (14) of the housing.