Rotating suspension stop with embedded seal

Abstract

A rotating suspension stop (10) for a suspension leg comprises: a bearing (18), a lower support (12), a seal seat (38), and a cover (20). The cover (20) has an annular skirt (46) with a mounting face (95) radially aligned with and at a distance from the seal seat (38) and / or the bearing (18). It also includes a single-material elastic seal (56) with a body (58) fixed to the mounting face (95) of the cover (20) and at least one annular sealing lip (60) projecting from the body (58) to the seal seat (38). A contact face (94) of the body (58) with the mounting face (95) has at least one radially recessed or raised molding (70) that forms a recess with a corresponding molding (71) of the mounting face (95). (Shortcut figure: 1)

Description

Title of the invention: Rotating suspension stop with embedded sealing gasket. Technical field of the invention.

[0001] The invention relates to a rotating suspension stop for interfacing an upper coil of a vehicle suspension helical spring with the vehicle body. PRIOR TECHNOLOGY

[0002] Document EP 3 626 486 A1 describes a rotating suspension stop for a suspension leg, comprising a lower support forming a bearing surface for an upper coil of a helical spring, a bearing supported by the lower support, and a cover forming a housing for the bearing with the lower support. An annular seal is press-fitted onto the cover and has several sealing lips pointing axially upwards, which come into sliding contact with the lower support to create a protective seal for the housing containing the bearing. Press-fitting the annular seal onto the cover requires a two-piece seal design, namely a rigid press-fit frame and an elastomeric seal body forming the sealing lips.Furthermore, to achieve a seal resistant to pressure washing fluid spray, such as that found in car wash stations, it is necessary to increase the number of sealing lips, which carries a risk of increased friction torque.

[0003] Document EP3693625 A1 describes a rotating suspension stop equipped with a single-material sealing and retaining gasket, comprising a gasket body fixed to the lower support in an unspecified manner, and a lip that makes sliding contact with a cylindrical wall of the cover to perform a sealing function. The cover is provided at the end of the cylindrical wall with a bead that radially overlaps the lip to ensure axial retention between the cover and the lower support. The gasket body is in surface contact with the lower support along a cylindrical interface and a flat annular interface.One solution for fixing the seal to the lower support is overmolding, as described, for example, in document FR 2 989 634 AL. A theoretical alternative solution would be shrink fitting, but this requires very tight manufacturing tolerances on the cylindrical wall of the lower support in contact with the seal body, to prevent any cylindricity defects in the cylindrical wall from being transmitted via the seal body to the sealing lip and thus degrading the sealing performance or the lifespan of the lip. This solution would impose... in addition to the rigid reinforcement at the joint level to ensure controlled shrink-fitting due to the small cross-section of the joint and the small height available for shrink-fitting. Description of the invention

[0004] The invention aims to remedy the drawbacks of the prior art and to propose a solution for achieving sealing, and preferably axial retention, between a cover and a lower support of a rotating suspension stop, which is economical, without sacrificing sealing performance, including under conditions of significant thermal fluctuations.

[0005] To this end, according to a first aspect of the invention, a rotating suspension stop for a suspension leg is proposed, the rotating suspension stop comprising: • a bearing defining a reference axis for the rotating stop, • a lower support forming a bearing surface rotated axially in a downward axial direction to bear against an upper coil of a helical spring, and a seal seat, • a cover defining with the lower support an annular volume for the bearing, the cover comprising an annular skirt having a fixing face facing radially towards the seal seat and / or the bearing, radially opposite and at a distance from the seal seat and / or the bearing, • a single-material elastic sealing gasket, having a body fixed to the fixing face of the cover and at least one annular sealing lip projecting from the body towards the gasket seat, a contact face of the body with the fixing face having at least one radially recessed or raised molding, creating an inset with a corresponding molding of the fixing face.

[0006] The recess allows for the simple mechanical fastening of a single-material elastic seal in the cover, eliminating the need for a shrink-fit reinforcement or bonding. The term "molding" here, and throughout the application, refers to any raised or recessed feature. The term "corresponding molding" refers to any molding which, through at least partial shape complementarity, provides a form-locking mechanism that prevents separation, at least within a range of forces corresponding to normal use of the rotating stop. The seal's attachment to the cover is made possible by the seal's elasticity, which allows for elastic deformation of the seal upon insertion into the cover, and a reduction in deformation when the molding and the corresponding molding interpenetrate.

[0007] When projected onto the reference axis, the body molding is located, according to one embodiment, at least partially, and preferably entirely, axially at a distance from a junction zone of the sealing lip with the body, in the downward axial direction. This distance allows the fastening and sealing functions to be separated and prevents geometric defects in the body molding or the corresponding cover molding, or inaccuracies during assembly, from negatively affecting the positioning of the sealing lip.

[0008] According to one embodiment, the sealing lip in a rest position is in sliding contact with the seal seat. Since the seal seat is formed on the lower support, radially inside the cover, the diameter of the seal seat, which determines the length of the contact interface between the lip and the seal seat, is relatively small, so that the friction torque is low.

[0009] According to one embodiment, the sealing lip projects radially from the body towards the reference axis and axially in the downward direction. Preferably, the sealing lip is frustoconical or substantially frustoconical. This lip orientation is advantageous for limiting the intrusion of a pressurized liquid jet from outside the rotating stop, since the pressurized jet will have the effect of pressing the lip more firmly against the seal seat.

[0010] The molding of the seal and the corresponding molding of the cover may have several hollows or asperities distributed around the circumference of the cover and the seal. However, such an arrangement requires angular indexing of the seal relative to the cover during assembly. Therefore, embodiments in which the body molding is annular are preferred. In one embodiment, the body molding is a raised edge.

[0011] For the same reasons, preferred embodiments are those in which the corresponding molding of the annular skirt of the cover is annular. According to one embodiment, the corresponding molding of the annular skirt of the cover is an annular groove.

[0012] Mounting the cover, equipped with its sealing gasket, onto the lower support requires certain precautions to avoid turning over or damaging the lip of the sealing gasket. To facilitate the guidance of the gasket lip during mounting, the lower support can be provided with a chamfer rotated radially opposite to the reference axis and axially opposite to the downward direction, the gasket seat being positioned in line with the chamfer, in the downward direction.

[0013] In practice, the seal seat has a geometric envelope that is a surface of revolution around the reference axis. A frustoconical seal seat, oriented in the upward or downward direction, can be considered. However, such an arrangement requires perfect control of the axial positioning of the cover. bearing the sealing gasket, if it is also necessary to control the contact pressure at the interface between the gasket lip and the gasket seat. Therefore, embodiments in which the gasket seat is cylindrical are preferred.

[0014] According to one embodiment, the annular skirt has a free annular end such that: the free annular end forms a stiffening collar. This stiffening is particularly useful for perfecting the control of the cover's geometry and preventing or limiting harmful dynamic deformations that would reduce the sealing quality, especially when the rotating stop is subjected to vibrations.

[0015] According to one embodiment, the annular skirt has a free annular end such that: the free annular end forms an axial stop for a heel formed by the body of the sealing gasket. This axial stop facilitates the mounting of the sealing gasket on the cover by determining the relative axial positioning of the two parts.

[0016] The mechanical properties of the material constituting the sealing gasket are judiciously chosen to allow both embedding in the cover and sliding of the sealing lip on the sealing seat. Preferably, the single-material sealing gasket is made of a material having a tensile or flexural modulus greater than 1000 MPa, and a tensile strength greater than 40 MPa.

[0017] Particularly suitable materials are the single-material sealing gasket made of polyketone or polyoxymethylene or acrylonitrile butadiene or thermoplastic polyurethane.

[0018] In certain applications, the rotating suspension stop is assembled before being mounted on the vehicle. It is then necessary to ensure the cohesion of the rotating stop before mounting it on the vehicle. According to one embodiment, the lower support comprises at least one retaining shoulder rotated axially in the downward direction, the sealing gasket having a boss partially overlapping radially with the retaining shoulder, at a distance from the retaining shoulder in the downward axial direction.

[0019] According to another embodiment, the lower support comprises at least one retaining shoulder (40') rotated axially in the downward direction, the cover comprising at least one boss partially overlapping radially with the retaining shoulder, at a distance from the retaining shoulder in the downward axial direction. This solution offers the advantage of simplifying the profile of the lower support, which can be made without undercuts. In particular, the lower support can be manufactured by axial molding, that is, between two mold pieces separated by translation parallel to the reference axis of the rotating stop, without requiring side slides for undercut shapes.

[0020] According to one embodiment, the sealing lip has a V-shaped axial cross-section, with the apex of the V pointing in the downward axial direction. This shape ensures good flexibility of the sealing lip and good control of the contact pressure with the seal seat, and therefore of the drag torque resisting the relative rotation of the lower support with respect to the cover around the reference axis of the rotating stop.

[0021] According to one embodiment, the bearing comprises an annular upper guide track fixed relative to the cover, an annular lower guide track fixed relative to the lower support, arranged opposite the upper guide track, and means interposed between the upper and lower guide tracks to allow rotation of the lower guide track relative to the upper guide track around the reference axis of the rotating thrust bearing. These means may, for example, include a lubricant film or an annular pad in sliding contact with the upper and lower guide tracks in the case of a plain bearing, or rolling elements, optionally housed in a cage, and rolling on the upper and lower guide tracks, in the case of a roller bearing.The upper guide path can be formed as a single piece with the cover or on a guide washer bearing against the cover. The lower guide path can be formed as a single piece with the lower support or on a guide washer bearing against the lower support. BRIEF DESCRIPTION OF THE FIGURES

[0022] Other features and advantages of the invention will become apparent from the following description, with reference to the attached figures.

[0023] [Fig.1] Fig.1 illustrates in axial half-section a rotating suspension stop according to a first embodiment of the invention.

[0024] [Fig.2] Fig.2 illustrates in axial half-section a rotating suspension stop following a second example of an embodiment of the invention.

[0025] [Fig.3] The [Fig.3] illustrates in axial half-section a rotating suspension stop according to a third embodiment of the invention.

[0026] [Fig.4] Fig.4 illustrates in perspective a detail of an internal sealing joint of the stop of the [Fig.l].

[0027] For clarity, identical or similar elements are identified by identical reference signs throughout the figures. DETAILED description of implementation methods

[0028] Figure 1 illustrates a rotating stop 10 for a vehicle suspension strut, comprising a lower support 12 forming a bearing surface 14 for an upper coil of a helical spring, and a bearing 18 supported by the lower support. 12 and a cover 20 forming with the lower support 12 a housing volume 300 for the bearing 18.

[0029] In this example, and without this necessarily having a limiting value, the bearing 18 has been illustrated as a rolling bearing comprising an upper washer 22 supported under the cover 20, a lower washer 24 supported on the lower support 12 and rolling elements 26 retained by a bearing cage 28 so as to roll on an upper guide track 30 formed on the upper washer 22 and a lower guide track 32 formed on the lower washer 24. The bearing 18 allows a relative rotational movement between the upper guide track 30 and the lower guide track 32, therefore between the cover 20 and the lower support 12, around a reference axis 100 of the bearing 18, which constitutes a reference axis of the rotating thrust bearing 10.The bearing 18 also defines an upward direction 200 parallel to the reference axis 100 and such that the bearing surface 14 of the lower support 12 is located under the bearing 18, itself located under the cover 20. After mounting on the vehicle, the reference axis 100 of the rotating stop 10 can be vertical or inclined.

[0030] The lower washer 24 bears against a bearing surface 34 of the lower support 12, which is axially rotated in an upward direction and, in this embodiment, is radially positioned overlapping the bearing surface 14 formed on the lower support 12 for an upper coil of a helical spring. The bearing surface 14 of the lower support 12 is axially rotated in a downward direction 202 opposite to the upward axial direction 200, and extends into a centering skirt 36 projecting axially downwards. The bearing surface 34 may be solid or discontinuous, in order to reduce weight while maintaining a rigid structure.

[0031] The lower support 12 further comprises an annular sealing seat 38 facing radially outwards and located radially outside the bearing face 34. The sealing seat 38 is, for example, cylindrical or frustoconical with a draft angle preferably less than 5° converging in an upward direction. The sealing seat 38 is extended by an outer annular transition face 42 which extends radially outwards from the sealing seat 38 and is axially rotated in the upward direction 200.

[0032] The lower support 12 further comprises an inner collar 40 projecting from a containment face 86, and extended by an inner annular transition face 44 frustoconical which extends from the inner collar 40 radially inwards and is axially rotated in the upward direction 200. The inner collar 40 forms a flat annular inner shoulder 40'.

[0033] The containment face 86 constitutes the inner face of the centering skirt 36. The containment face 86 is generally cylindrical, or slightly frustoconical with a converging draft angle in the upward direction. The containment face 86 delimits a housing or containment volume for a shock absorber (not shown in the figures).

[0034] The lower support 12 forms an annular chamfer 80 rotated radially opposite the reference axis 100 and axially in the upward direction 200.

[0035] Remarkably, the lower support 12, considered in the axial direction, has no undercuts, or no undercuts that would prevent demolding of the part produced by molding in a mold whose shells are movable in translation parallel to the reference axis. The lower support is therefore preferably made in such a mold. It can be a part made of plastic, with or without a reinforcing insert, or a part made of light metal, particularly aluminum.

[0036] The cover 20 comprises an outer annular skirt 46 opposite and at a distance from the seal seat 38 and an inner annular skirt 48 opposite and at a distance from the inner flange 40, such that an outer annular passage 50 is defined for access to the bearing housing volume 300 between the seal seat 38 and the annular skirt 46, and an inner annular passage 52 for access to the bearing housing volume 300 between the inner flange 40 and the inner skirt 48. One of the two skirts 46, 48 of the cover 20, here the inner skirt 48, may be provided with one or more retaining bosses projecting radially from the skirt towards the lower support 12, here in the form of a ring or individual hooks 54 at an annular end of the inner skirt 48. The outer annular skirt 46 may have a flange 90 of stiffening at one free annular end 88.This stiffening collar 90 helps to limit any deformation of the annular skirt 46 under mechanical stress.

[0037] In the outer annular passage 50 is engaged a single-material elastic sealing gasket 56, intended to protect the bearing 18 against external pollution.

[0038] In this embodiment, the single-material sealing gasket 56, illustrated in detail in [Fig. 4], is made of a single piece of elastomeric material without an insert, and comprises an annular body 58 and a sliding sealing lip 60. The sealing lip 60 projects from a junction zone 62 with the annular body 58 and is in sliding contact with the gasket seat 38 of the lower support 12. The annular body 58 bears elastically against the annular skirt 46. The diameter of the gasket seat 38 determines the perimeter of the contact interface between the sealing lip 60 and the gasket seat 38, and is preferably relatively small to ensure low friction torque.

[0039] The body 58 of the single-material sealing joint 56 is annular and extends from the junction zone 62 in the downward direction 202, and constitutes a seal static with the annular skirt 46. The body 58 includes a contact face 94 with a molding 70 which, in this embodiment, can be an annular bead or a set of one or more bosses projecting radially from the rest of the contact face 94 towards the annular skirt 46 of the cover 20. Optionally, the body 58 includes a heel 96. The heel 96 forms a shoulder, located vertically below the molding 70, at the lower end of the body 58, projecting axially from the body 58, so that the body 58, via the shoulder of the heel 96, comes into axial contact with the free annular end of the annular skirt 46. This ensures precise axial positioning during assembly.

[0040] The molding 70 can be of the point or annular type, and defines a radially projecting relief, or a recess, relative to the rest of the contact face 94 of the body 58 of the sealing gasket 56, said contact surface 94 being generally cylindrical and configured to rest, possibly in the manner of a shrink fit, against a corresponding mounting face 95 of the annular skirt 46. When the molding 70 is of the point type, the body 58 then comprises several moldings 70, preferably distributed equidistant from each other, and preferably of rounded shape, such as a tallow drop or a spherical cap. When the molding 70 is of the annular type, the molding 70 is preferably rounded, such as an annular bead.

[0041] Before the cover 20 is placed on the lower support 12, the single-material sealing gasket 56 is inserted into the cover 20 in contact with a fixing face 95 of the annular skirt 46. The single-material sealing gasket 56, via the molding 70, enters elastically into a corresponding molding 71 present on the fixing face 95 of the annular skirt 46. The corresponding molding 71 is hollow and forms an annular groove if the molding 70 of the gasket 56 is in relief with respect to the body 58 of the gasket 56, and vice versa.

[0042] The corresponding molding 71 is point or annular, depending on the molding 70 of the joint 56. When the molding 70 of the joint 56 is annular, the corresponding molding 71 is annular, and when the molding 70 of the joint 56 is point, the corresponding molding 71 may be point or, preferably, annular.

[0043] In a preferred embodiment, the corresponding molding 71 and the molding 70 are complementary in at least one axial section, in the sense that their shapes are complementary to each other.

[0044] According to the embodiment illustrated in [Fig. 1], when the single-material sealing gasket 56 is inserted into the cover 20, the elastic nature of the sealing gasket 56 operates to allow elastic deformation of the molding 70. The molding 70 deforms during its insertion into the cover 20 and then, when it reaches the corresponding molding 71, relaxes and returns to its initial shape, or an intermediate shape between its rest state and its transient state during assembly. The molding 70 is then locked into the corresponding molding 71, which we define in this application as an embedding.

[0045] Once the sealing gasket 56 is secured to the cover 20, and after mounting the bearing 18 on the lower support 12, the cover 20 can be assembled onto the lower support 12 by a bringing-together movement in translation parallel to the reference axis 100. The sealing gasket 56 then enters the outer annular passage 50. The sealing lip 60 first enters into sliding contact with the first chamfer 80 of the lower support 12, then is progressively guided by the first chamfer 80, as the lower support 12 penetrates the cover 20, up to the gasket seat 38.Furthermore, the crown 54 of the cover 20 deforms elastically as it passes over the inner annular transition face 44, which is truncated cone-shaped, and then relaxes elastically to position itself under the inner flange 40 of the lower support 12, at the level of the inner annular shoulder 40', to create, after assembly, an attachment between the cover 20 and the lower support 12. This attachment ensures the cohesion of the suspension stop before its assembly on the vehicle.

[0046] The junction zone 62 between the sealing lip 60 and the body 58 of the seal may have an increased thickness compared to that of the body 58 of the seal. Thus, the stresses induced in the material of the single-material seal 56 by the deformation of the sealing lip 60 following the embedding of the molding 70 of the body 58 of the seal into the corresponding molding 71 of the annular skirt 46 of the cover 20 are distributed in the body 58 of the seal and in the junction zone 62, without generating significant deformations at the level of the sealing lip 60, which could reduce the quality of the seal. The junction zone 6 2 between the sealing lip 6 0 and the body 58 of the seal is preferably positioned, with reference to the upward direction 200, at a level vertically above the body 58 and the sealing lip 60.

[0047] Figure 2 illustrates an embodiment where the molding 70 is hollow in an annular manner and the corresponding molding is raised in a punctual manner. Furthermore, the embodiment of [Fig. 2] differs from the previous one by the absence of the crown 54 on the inner skirt 48. To perform the locking function between the cover 20 and the lower support 12, the lower support 12 has a retaining shoulder 72 which, in a cross-sectional view, has a horsehead structure, forming a groove 72' above the seal seat 38. The retaining shoulder 72 forms a second chamfer 82 which, like the first chamfer 80, is rotated radially opposite to the reference axis 100 and axially in the upward direction 200. The single-material seal 56 forms a boss 74 that radially overlaps the retaining shoulder 72 of the lower support 12. During From the assembly of the cover 20 and the sealing gasket 56 with the lower support 12, the sealing lip 60 and the boss 74 can slide on the second chamfer 82, and then, for the sealing lip, on the first chamfer 80, in order to reach their assembled position. Once assembled, and before its mounting on the vehicle, the rotating stop 10 maintains its coherence thanks to the radial overlap between the boss 74, housed in the groove 72', and the retaining shoulder 72, which limits, in the downward axial direction, the freedom of movement of the lower support 12 relative to the cover 20. The horsehead structure of the retaining shoulder 72 also allows, in combination with the boss 74 of the single-material sealing gasket 56, the creation of a staggered path in the outer annular passage 50.After mounting on the vehicle, the stop function described above is no longer useful, but the baffle formed between the boss 74 and the groove 72' allows for better retention of the lubricant, grease for example, present to lubricate the rolling parts 26 and to reduce the risk of the entry of pollutants from an external environment.

[0048] According to another embodiment, illustrated in [Fig. 3], the inner flange 40 is replaced by an inner bearing surface 140, comprising an inner chamfer 180. The inner bearing surface 140 has an inner seal seat 138, on which rests the inner lip 160 of an inner seal 156 fixed to the inner skirt 48 in a manner similar to the sealing gasket of [Fig. 1]. More specifically, the single-material sealing gasket 156 forms a molding 170 that elastically penetrates a corresponding molding 171 formed on the inner skirt 48. The corresponding molding 171 is hollow and forms an annular groove if the molding 170 of the gasket 156 is raised, and vice versa.

[0049] In this embodiment, the cover 20 comprises the sealing gasket 58 and the inner sealing gasket 158. When the sealing gasket 58 is as shown in the second embodiment and performs the function of attaching the cover 20 to the lower support 12, the inner sealing gasket 158 ​​is similar to the sealing gasket 58 of the first embodiment. Conversely, when the sealing gasket 58 is as shown in the first embodiment, the inner sealing gasket 158 ​​is similar to the sealing gasket 58 of the second embodiment, for achieving the attachment between the cover 20 and the lower support 12.

[0050] As illustrated in detail in [Fig. 4], the sealing lip 60, in axial section and before assembly of the cover 20 onto the lower support 12, has a V-shape pointing in the downward direction 202. A free end of the V-shaped sealing lip 60 has a vertex 400 with a sharp angle greater than 10°, preferably greater than 15° and less than 80°, preferably less than 40°, the vertex having, in axial section, a bisector 600 making an angle 500, preferably greater than 10°, preferably greater than 20°, with the upward axial direction 200. The The downward direction of the sealing lip 60 is particularly effective in opposing the penetration of pollutants from the outside into the inner volume 300. The resulting sealing joint 56 exhibits excellent characteristics in terms of the mechanical strength of the joint.

[0051] The single-material sealing gasket 56 is preferably made of polyketone. The single-material sealing gasket 56 may also be composed, preferably, of polyoxymethylene, acrylonitrile butadiene, or thermoplastic polyurethane. Regardless of the material used from those mentioned above, the material gives the gasket 56 a tensile or flexural modulus greater than 1000 MPa and a tensile strength greater than 40 MPa.

[0052] The examples shown in the figures and discussed above are given for illustrative purposes only. Other embodiments may be considered, in particular by combining the features of the different illustrated embodiments.

[0053] What is described for a sealing and retaining joint can be adapted to a joint having only a sealing function. The sealing joint 56 can be in permanent sliding contact with the associated seal seat 38, or in intermittent sliding contact, depending on the magnitude and direction of the forces applied to the rotating suspension stop.

Claims

Demands

1. A rotating suspension stop (10) for a suspension leg, the rotating suspension stop (10) comprising: - a bearing (18) defining a reference axis (100) of the rotating stop (10), - a lower support (12) forming a bearing surface (14) rotated axially in a downward axial direction (202) to bear against an upper coil of a helical spring, and a seal seat (38), - a cover (20) delimiting with the lower support (12) an annular volume (300) for the bearing (18), the cover (20) comprising an annular skirt (46) having a mounting face (95) rotated radially towards the seal seat (38) and / or the bearing (18), radially opposite and at a distance from the seal seat (38) and / or the bearing (18), - a single-material elastic seal (56),having a body (58) fixed to the fixing face (95) of the cover (20) and at least one annular sealing lip (60) projecting from the body (58) towards the gasket seat (38), characterized in that a contact face (94) of the body (58) with the fixing face (95), facing radially towards the fixing face (95) and opposite the gasket seat, has at least one molding (70) radially recessed or raised relative to the rest of the contact face (94), creating an inset with a corresponding molding (71) of the fixing face (95).

2. Rotating suspension stop (10) according to claim 1, characterized in that, when projected onto the reference axis, the molding (70) of the body is located at least partially, and preferably entirely, axially at a distance from a junction zone (62) of the sealing lip (60) with the body (58), in the downward axial direction.

3. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that in a rest position, the sealing lip (60) is in sliding contact with the seal seat (38).

4. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the sealing lip (60) projects from the body (58) radially towards the reference axis and axially in the downward direction.

5. Rotating suspension stop (10) according to claim 4, characterized in that the sealing lip (60) is frustoconical.

6. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the molding (70) of the body (58) is annular.

7. Rotating suspension stop (10) according to claim 6, characterized in that the molding (70) of the body (58) is a bead.

8. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the corresponding molding (71) of the annular skirt (46) of the cover (20) is annular.

9. Rotating suspension stop (10) according to claim 8, characterized in that the corresponding molding (71) of the annular skirt (46) of the cover is an annular groove.

10. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the lower support (12) has a chamfer (80, 82) rotated radially in the opposite direction to the reference axis and axially in the opposite direction to the downward direction, the seal seat (38) being positioned in continuity with the chamfer, in the downward direction.

11. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the joint seat (38) is cylindrical.

12. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the annular skirt (46) has a free annular end such that: - the free annular end forms a stiffening collar (90); and / or - the free annular end forms an axial stop for a heel formed by the body of the sealing joint.

13. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the single-material seal is made of a material having a modulus tensile or flexural strength greater than 1000 MPa, and breaking strength greater than 40 MPa.

14. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the single-material sealing gasket is made of polyketone or polyoxymethylene or acrylonitrile butadiene or thermoplastic polyurethane.

15. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the lower support (12) has at least one retaining shoulder (72) rotated axially in the downward direction, the sealing joint having a boss (74) partly in radial overlap with the retaining shoulder (72), at a distance from the retaining shoulder (72) in the downward axial direction.

16. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the lower support (12) has at least one retaining shoulder (40') rotated axially in the downward direction, the cover having at least one boss (54) partially radially overlapping the retaining shoulder (40'), at a distance from the retaining shoulder (40') in the downward axial direction.

17. Rotating suspension stop (10) according to any one of the preceding claims, characterized in that the sealing lip (60) has a V-shaped axial section, with a vertex of V pointing in the downward axial direction.

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