• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A suspension stop (18), for a suspension strut (10) having a coil spring (14), comprises a bearing (20), a cover (58), having a lower face in contact with the bearing (20) and a snap-in zone (62) and a monobloc cup (34) having an upper face (36) delimiting with the underside of the cover (58) a housing (59) for the bearing (20), and a lower face ( 42) having a peripheral annular support zone (47) for an upper end of the coil spring (14), the peripheral annular support zone (47) being located radially outside the ratchet zone (62). ). The suspension abutment (18) further comprises an assembly ring (64) integral with the one-piece cup (34) and comprising at least one complementary snap-fitting zone (74) projecting radially towards the snap-in zone (62). ) of the lid, so as to snap onto the latching region (62) of the lid.
    公开号:FR3048920A1
    申请号:FR1652339
    申请日:2016-03-18
    公开日:2017-09-22
    发明作者:Sebastien Delarche；Cyril Peterschmitt
    申请人:NTN SNR Roulements SA；
    IPC主号:
    专利说明:

    MONOBLOC CUT SUSPENSION STOP WITH AXIAL MOLDING TECHNICAL FIELD OF THE INVENTION
    The invention relates to a suspension abutment for a strut comprising a coil spring. The invention also relates to a suspension strut comprising such a stop.
    STATE OF THE PRIOR ART
    In WO 2015/014760 describes a suspension stop for a suspension strut comprising a telescopic damper and a coil spring, the suspension stop defining a reference geometric axis and comprising: a bearing comprising at least one upper washer and a lower washer rotating relative to each other; a one-piece molded plastic cover having a lower face having a contact area with the upper washer, the cover having at least one snap-in zone; and a lower monoblock cup made of molded material having an upper face having a contact zone with the lower washer and a lower face having a peripheral annular bearing zone for the upper end of the coil spring, the cup having protruding hooks. radially towards the latching zone of the lid, so as to snap onto the latching zone of the lid, the cup having lights in axial alignment with the hooks so that the cup has no overlapping portion radial with the hooks. The lights, which have no function in the stop in operation, are the trace of the manufacturing method of the monobloc cup by molding in a mold whose parts are movable relative to each other in translation parallel to the axis reference. In other words, the shapes are chosen so as to avoid a mold with lateral drawers, in order to increase the production rates and to limit complexity and costs. But the presence of lights is likely to weaken the monobloc cup, and to promote stress concentrations and launches in charge. In addition, the lights can be a path of entry of pollutants to the damper rod.
    STATEMENT OF THE INVENTION
    The invention aims to overcome the disadvantages of the state of the art and to propose a rotating suspension stop easy to manufacture, and forming a coherent subassembly before mounting on the vehicle, and which has no area fragilization.
    To do this is proposed, according to a first aspect of the invention, a suspension stop for a suspension leg comprising a coil spring, the suspension stop defining a reference geometric axis and comprising: a bearing; a lid, having a lower face having a contact zone with the bearing, the lid having at least one latching zone; a lower one-piece molded plastic or composite cup, having an upper face delimiting with the lower face of the cover a housing for the bearing, and a lower face having a peripheral annular support zone for an upper end of the coil spring, the annular peripheral support zone being located radially outside the snap zone; and an assembly ring integral with the one-piece cup and comprising at least one complementary snap-fitting zone projecting radially towards the latching zone of the lid, so as to snap onto the latching zone of the lid.
    By providing a complementary snap area on a dedicated part, namely the assembly ring, it simplifies the molding of the lower monobloc cup, which can if necessary be made by molding in a mold whose parts are movable relative to each other in translation relative to the reference axis.
    The monobloc cup, preferably made of moldable material, in particular plastic or a composite material with or without a metal insert, is in itself the interface with the coil spring.
    [0007] Preferably, the snap zone is annular. Similarly, the complementary snapping zone is annular. The snap zone can thus, with the complementary snap-in zone, constitute a seal or a pressure drop between the bearing and the outside. According to a particularly advantageous mode, it is arranged that in a nominal operating position, the snap-in zone is not in contact with the complementary snap-in zone, a baffling being made between the snap-in zone and the complementary zone of the snap-in zone. snap. This provides a protection of the bearing against pollutants, without generating significant friction torque. Alternatively, it is possible to envisage a contact between the snap-in zone and the complementary latching zone in the assembled nominal position to reinforce the seal.
    The assembly ring can be secured to the monoblock cup by different means. According to one embodiment, the assembly ring comprises a base overmolded in the molded plastic material of the lower monoblock cup. Alternatively, the assembly ring comprises at least one elastically deformable lower attachment zone snapped into at least one additional attachment zone of the lower cup. Such an assembly snap elastic, preferably non-reversible, is sufficient to ensure the cohesion of the parts before assembly on the vehicle.
    Preferably, the lower cup comprises a contact zone with the bearing, preferably having ribs. At least a portion of the axial load on the abutment can follow a path passing without intermediate bearing to the one-piece cup, and from it to the coil spring. According to one embodiment, the assembly ring is not in contact with the bearing, in which case the entire axial load passes without intermediate bearing to the one-piece cup.
    Alternatively, it is also possible that the bearing rests at least partially on the assembly ring, so that at least part of the load passes through the assembly ring.
    Preferably, the upper face of the monobloc cup comprises reinforcing ribs located radially outside the contact zone. These ribs are intended to provide bending rigidity to the cup, while limiting its mass. Preferably, at least some of the ribs are radial. The ribs can radially transfer the forces between the bearing and the coil spring, while limiting the level of stress in the cup. According to one embodiment, at least some of the ribs delimit polygonal cells. Thus, several modes of deformation are managed.
    The contact zone may also comprise ribs on which the bearing rests.
    According to one embodiment, the lower face of the monobloc cup comprises: an annular outer plane shoulder and an at least partially cylindrical annular bearing surface radially outwardly delimiting with the outer shoulder the peripheral annular support zone for the upper end of the coil spring.
    According to a particularly advantageous embodiment, the lower face of the one-piece cup comprises a housing zone of an upper end of a shock buffer, defined by an annular inner plane shoulder and a confinement face at least partially cylindrical turned radially inwards. Preferably, the one-piece cup has a partition forming an annular fold constituting the confinement face and the annular bearing surface, the confinement face being located radially inside the annular bearing surface. The structure of the monoblock cup is then particularly rigid, while remaining simple to mold because it consists of walls of uniform thickness. Preferably, the upper face of the monoblock cup comprises reinforcing ribs, at least some of which extend inside the annular fold of the partition.
    Preferably, the bearing is located radially inside the ratchet zone.
    According to one embodiment, the complementary latching zone projects radially outwards and the latching zone projects radially inwardly. Alternatively, the complementary snap-in zone projects radially inwards and the snap-in zone protrudes radially outwards.
    According to one embodiment, the bearing comprises at least one upper washer and a lower washer rotating relative to each other.
    According to one embodiment, the lower washer has a diameter less than an inner diameter of the annular peripheral support zone of the upper end of the coil spring.
    According to one embodiment, the bearing is a rolling bearing, comprising rolling bodies in contact with the raceways formed on the upper and lower washers. Alternatively, the bearing may be a plain bearing, comprising one or more friction washers interposed between the lid and the monoblock cup. The washers are preferably metallic, although other materials may be envisaged, particularly in the case of a plain bearing. The lower washer can be made by stamping. The upper washer can be massive or made by stamping.
    The invention is particularly suitable for a suspension stop whose upper washer forms a flat annular bearing surface for a telescopic shock absorber of the suspension strut, the flat bearing annular bearing extending radially towards the inside compared to the lower washer.
    According to another aspect of the invention, it relates to a suspension strut comprising a coil spring, and a suspension abutment as described above, the coil spring having an upper end bearing against the support zone.
    According to one embodiment, the suspension strut further comprises a shock buffer having an upper end housed in a housing area formed by a plane or frustoconical annular shoulder and a confining face of the cup.
    According to one embodiment, the suspension strut further comprising a telescopic damper passing through the suspension stop and bearing against the annular bearing surface formed by the upper washer.
    BRIEF DESCRIPTION OF THE FIGURES
    Other features and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate: FIG. 1, a sectional view of a suspension strut and a suspension stop according to a first embodiment of the invention; Figure 2, an exploded view of a cup and an assembly ring of the stop of Figure 1; Figure 3 is a sectional view of a suspension stop according to another embodiment of the invention; Figure 4 is an isometric view of an assembly ring of the abutment of Figure 3; Figure 5 a detail of a stud of the assembly ring of Figure 4; Figure 6 is a sectional view of a suspension stop according to an alternative embodiment; Figure 7, a sectional view of a suspension abutment according to another embodiment of the invention.
    For clarity, the identical elements are identified by identical reference signs throughout the figures.
    DETAILED DESCRIPTION OF EMBODIMENTS
    Referring to Figure 1, a strut 10 is composed in its upper part of a telescopic damper which only an end rod 12 has been illustrated, a coil spring 14, d ' a shock pad 16 and a rotating suspension stop 18 providing the interface between the preceding elements and the vehicle body (not shown).
    The rotation of the abutment 18 about an axis 100 is provided by a rolling bearing 20 having a metal top washer 22 and a metal washer 24 preferably made by stamping a sheet, and defining paths rolling bearings 26, 28 on which rolling bodies 30 roll, in this case balls. The upper washer 22 forms a flat bearing annular bearing surface 32 for the rod of the telescopic damper 12, extending radially inwardly relative to the raceways 26, 28.
    The interface between on the one hand the bearing 20 and on the other hand the body (not shown) of the telescopic damper, the coil spring 14 and the shock pad 16 is provided by a support cup monobloc 34 molded plastic or composite material.
    This cup has on its upper face 36 a contact zone 38 with the lower washer 24 of the bearing 20, composed of ribs 39, the lower washer 24 being supported on the edges of the ribs 39. The ribs 39 may be radial as illustrated in Figures 1 and 2 or circular and concentric. The upper face 36 of the cup 34 further comprises reinforcing ribs 40 located radially outside the contact zone 38, extending from the latter to the outer periphery of the cup 34.
    The lower face 42 of the cup 34 has at its periphery an outer plane annular shoulder 44 and an at least partially cylindrical annular surface 46 rotated radially outwards delimiting with the outer shoulder 44 a peripheral annular support zone. 47 for the upper end of the coil spring.
    The cup 34 has a partition forming an annular fold 49 which constitutes the annular bearing surface 46 and externally surrounds a housing zone 50 of an upper end of the shock buffer 16 formed by a plane or frustoconical annular shoulder 52 and by a containment face 54 preferably at least partially cylindrical or slightly conical turned radially inwards. The containment face 54 of the housing zone 50 of the upper end of the shock buffer 16 is located radially inside the annular bearing surface 46 of the bearing zone of the upper end of the spring 14. The washer bottom 24 has a diameter smaller than the diameter of the cylindrical bearing surface 46 and preferably smaller than the diameter of the confinement face 54.
    A one-piece protective cover 58 of the bearing 20 bears on the upper washer 22 of the bearing 20 and delimits with the cup 34 a housing 59 for the bearing 20. The one-piece cover 58 forms a peripheral skirt 60 having a protective zone. snap 62 here constituted by an annular bead projecting radially inwardly.
    The rotary suspension abutment 18 further comprises an assembly ring 64 integral with the monobloc cup 34, comprising a flange 66 intended to bear axially on the upper face 36 of the cup 34, a sleeve 68 protruding axially from the flange 66 to the bearing 20, and a skirt 70 extending axially from the collar 66 to the one-piece cup 34, this skirt 70 being extended by individual studs 72 distributed at its circumference. As illustrated in FIG. 1, these pads 72 are flush with the lower face 42 of the cup 34, at the level of the shoulder 52.
    The skirt 70 and the pads 72 thus constitute a base 73 of the assembly ring 64, overmolded in the one-piece cup 34. The upper end of the sleeve 68 forms an annular collar 74 having a hook-shaped profile which makes protruding radially towards the peripheral skirt 60 of the cover and constitutes a complementary peripheral snap zone.
    The snap zone 62 of the peripheral skirt 60 and the complementary snap-fitting zone 74 of the assembly ring 64 make it possible to form a pre-assembled coherent subassembly between the bearing 20 and the cup 34 before mounting on the vehicle. After mounting on the vehicle, the snap-fitting zone 62 of the peripheral skirt 60 and the complementary snap-fastening zone 74 are no longer in contact, except where necessary in the event of major stresses on the abutment causing deformation of the parts. In nominal position, they define an annular baffle passage, which protects the inside of the bearing 20 from external intrusions.
    This configuration allows a manufacture in two steps: the assembly ring 64 is first made of plastic or composite material in a first mold, and then this part is inserted into a second injection mold of the plastic material or constituent composite of the one-piece cup 34, the pads 72 being in this phase in contact with the walls of the mold and allowing controlled positioning of the assembly ring 64 in the second mold.
    The injection molding of the assembly ring 64 can be done in a three-piece mold, one producing an annular cavity for the flange 66, the skirt 70 and the individual pads 72, the other two, movable radially relative to the first, providing the cavity for the sleeve 68 and the complementary snap-fitting zone 74. Alternatively, it is possible to envisage a molding in a two-piece mold moving in translation relative to one another in a direction perpendicular to the reference axis 100.
    Where appropriate, the two manufacturing steps of the assembly ring and the manufacture of the monoblock cup can be performed in the same molding tool having a first cavity for molding the assembly ring 64 from a first injection circuit, and a second cavity for molding the monobloc cup 34 around the assembly ring 64 from a second injection circuit. The displacement of the assembly ring 64 from the first to the second cavity is then performed by a robot.
    The rotary suspension stop of Figures 3 to 5 is very similar to those of Figures 1 and 2, but differs in the embodiment of the connection between the monobloc cup 34 and the assembly ring 64, these two parts being manufactured separately and assembled to each other mechanically. To obtain sufficient securing, the pads 72 are provided with ribs 76 which are inserted by broaching into holes 78 provided for this purpose in the one-piece support cup.
    Alternatively, and as shown in Figure 6, it can be provided that the pads 72 have a head 80 projecting from the underside of the monobloc cup 34, and that is deformed hot to form a riveting. This method of attachment can complete pads 72 with ribs 76, but is also compatible with cylindrical studs.
    According to another variant, the projecting head 80 of the pads 72 is elastically deformable, so as to fade during the insertion of the pads 72 in the holes 78, and to resume a radially projecting hooking position and in bearing against the lower face 42 of the cup 34 at the end of insertion.
    It can also be provided that the snap-fitting zone 62 of the cover 58 is turned radially outwards and the complementary snap-fitting zone 74 of the ring gear 64 is turned radially inwards, to achieve more favorable shapes. axial molding of the crown 64 and the cover 58, without undercuts, as shown in Figure 7. The general shape of the ring 64 is simplified, the sleeve 68 and the skirt 70 can be directly in the extension of one another.
    Other variants are naturally possible. It is in particular possible to provide an insert, in particular a metal insert, for reinforcing the cup.
    The snap zone 62 may be discontinuous and composed of a plurality of angular sectors projecting radially inwardly.
    The reinforcing ribs 40 located radially outside the contact zone 38 on the upper face 36 of the cup 34 may constitute a network of honeycombs.
    权利要求:
    Claims (16)
    [1" id="c-fr-0001]
    1. Suspension stop (18), for a suspension strut (10) comprising a coil spring (14), the suspension stop (18) defining a reference geometrical axis (100) and comprising: - a bearing (20) ); - a cover (58) having a lower face having a contact area with the bearing (20), the cover (58) having at least one detent region (62); a lower one-piece molded plastic or composite cup (34), having an upper face (36) delimiting with the lower face of the cover (58) a housing (59) for the bearing (20), and a lower face (42); ) having a peripheral annular support zone (47) for an upper end of the coil spring (14), the peripheral annular support zone (47) being located radially outside the ratchet zone (62) ; characterized in that the suspension stop (18) further comprises an assembly ring (64) integral with the one-piece cup (34) and comprising at least one complementary snap-fitting zone (74) projecting radially towards the zone d latching (62) of the lid, so as to snap onto the latching region (62) of the lid.
    [2" id="c-fr-0002]
    2. Suspension stop (18) according to claim 1, characterized in that the detent region (62) is annular.
    [3" id="c-fr-0003]
    3. Suspension stop (18) according to any one of the preceding claims, characterized in that the complementary locking zone (74) is annular.
    [4" id="c-fr-0004]
    4. Suspension stop (18) according to any one of the preceding claims, characterized in that in a nominal operating position, the snap-in zone (62) is not in contact with the complementary snap-in zone (74), a baffling being made between the snap-in zone (62) and the complementary snap-in zone (74).
    [5" id="c-fr-0005]
    5. suspension stop (18) according to any one of the preceding claims, characterized in that the connecting ring (64) comprises a base (73) overmolded in the molded plastic material of the lower monobloc cup (34).
    [6" id="c-fr-0006]
    6. Suspension stop (18) according to any one of claims 1 to 4, characterized in that the assembly ring (64) comprises at least one elastically deformable lower attachment zone snapped into at least one zone of complementary attachment of the lower cup.
    [7" id="c-fr-0007]
    7. Suspension stop (18) according to any one of the preceding claims, characterized in that the lower cup has a contact zone (38) with the bearing (58), preferably having ribs (39).
    [8" id="c-fr-0008]
    8. Suspension stop (18) according to any one of the preceding claims, characterized in that the assembly ring is not in contact with the bearing (58).
    [9" id="c-fr-0009]
    9. Suspension stop (18) according to any one of the preceding claims, characterized in that the bearing (58) is located radially inside the ratchet zone.
    [10" id="c-fr-0010]
    10. Suspension stop (18) according to any one of the preceding claims, characterized in that the complementary latching region (74) projects radially outwards and the detent region (62) protrudes radially towards inside.
    [11" id="c-fr-0011]
    11. Suspension stop (18) according to any one of claims 1 to 9, characterized in that the complementary latching zone (74) protrudes radially inwards and the detent zone (62) protrudes radially outward.
    [12" id="c-fr-0012]
    12. Suspension stop (18) according to any one of the preceding claims, characterized in that the bearing (58) comprises at least one upper washer (22) and a lower washer (24) rotating relative to one another. 'other.
    [13" id="c-fr-0013]
    13. Suspension stop according to claim 12, characterized in that the upper washer (22) forms a flat annular bearing surface (32) for a telescopic damper (12) of the strut (10), the annular bearing support plane (32) extending radially inwards relative to the lower washer.
    [14" id="c-fr-0014]
    14. Suspension strut (10) comprising a coil spring (14), characterized in that it comprises a suspension stop (18) according to any one of the preceding claims, the coil spring (14) having one end upper bearing against the support zone (47).
    [15" id="c-fr-0015]
    The suspension strut (10) according to claim 14, further comprising a shock pad (16) having an upper end accommodated in a housing area (50) formed by a flat or frustoconical annular shoulder (52) and a containment face (54) of the cup (34).
    [16" id="c-fr-0016]
    16. Suspension strut (10) according to claim 14 or claim 15, the suspension stop (18) being according to claim 13, the strut (10) further comprising a telescopic damper (12) passing through the abutment of suspension (18) and bearing against the annular bearing surface (32) formed by the upper washer (22).
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP3219521A1|2017-09-20|
    FR3048920B1|2018-04-06|
    EP3219521B1|2019-02-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR2863944A1|2003-12-18|2005-06-24|Zahnradfabrik Friedrichshafen|Strut for motor vehicle, has spring up with support for suspension spring of vehicle, where support is extended radially up to axial front surface of stop and is fixed to spring up by interlocking connection|
    FR2915929A1|2007-05-09|2008-11-14|Snr Roulements Sa|SUSPENSION STOPPER WITH FILTER ELEMENT AND METHOD FOR MANUFACTURING SAME.|
    FR2921016A1|2007-09-19|2009-03-20|Skf Ab|SUSPENSION STOPPER DEVICE AND FORCE LEG|
    WO2015014760A1|2013-07-30|2015-02-05|Ntn-Snr Roulements|Thrust bearing for a vehicle suspension|
    FR3101279B1|2019-09-26|2021-10-08|Ntn Snr Roulements|SUSPENSION STOPS AND ASSOCIATED SUSPENSION STOPS|
    FR3103018B1|2019-11-07|2021-11-19|Ntn Snr Roulements|Automotive vehicle suspension stopper|
    DE102019218060A1|2019-11-22|2021-05-27|Ford Global Technologies, Llc|Stop buffering device with progressively increasing spring characteristics|
    法律状态:
    2017-03-22| PLFP| Fee payment|Year of fee payment: 2 |
    2017-09-22| PLSC| Publication of the preliminary search report|Effective date: 20170922 |
    2018-03-23| PLFP| Fee payment|Year of fee payment: 3 |
    2019-03-22| PLFP| Fee payment|Year of fee payment: 4 |
    2020-12-18| ST| Notification of lapse|Effective date: 20201110 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1652339|2016-03-18|
    FR1652339A|FR3048920B1|2016-03-18|2016-03-18|MONOBLOC SUSPENSION STOP SUSPENSION WITH AXIAL MOLDING|FR1652339A| FR3048920B1|2016-03-18|2016-03-18|MONOBLOC SUSPENSION STOP SUSPENSION WITH AXIAL MOLDING|
    EP17160855.7A| EP3219521B1|2016-03-18|2017-03-14|Bump stop with axially moulded integral cup|
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