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    ACTUATOR FOR OPENING AND CLOSING A DOOR OR A TAILGATE OF A CAR
    4.
    发明公开
    ACTUATOR FOR OPENING AND CLOSING A DOOR OR A TAILGATE OF A CAR 审中-公开

    公开(公告)号：EP3702638A1

    公开(公告)日：2020-09-02

    申请号：EP19159435.7

    申请日：2019-02-26

    申请人： NV Bekaert SA

    发明人： CARDON, Olivier ,  VERMEERSCH, Vincent ,  VAN DE VELDE, Johan ,  GHEKIERE, Pieter ,  VAN HAVER, Wim

    IPC分类号： F16F1/02 ,  E05F1/10 ,  E05F15/622

    摘要： An actuator for opening and closing a door or a tailgate of a car comprises a helical compression spring and a motor. The helical compression spring is provided for opening a door or the tailgate of a car when compressive forces of the helical compression spring are released. The motor is provided for compressing the helical compression spring in order to close the door or the tailgate of the car. The helical compression spring comprises a helically coiled coated steel wire. The helically coiled coated steel wire comprises a steel core and a metallic coating layer. The steel core comprises a steel alloy. The steel alloy comprises between 0.8 and 0.95 wt% carbon, between 0.2 and 0.9 wt% manganese; between 0.1 and 1.4 wt% silicon; optionally one or more than one of the micro-alloying elements chromium, vanadium, tungsten, molybdenum, niobium or boron; optionally aluminum; unavoidable impurities; and iron. The microstructure of the steel core is drawn lamellar pearlite. The metallic coating layer comprises at least 84% by mass of zinc; and preferably aluminum.

    METHOD FOR MAKING A SPRING
    6.
    发明公开
    METHOD FOR MAKING A SPRING 审中-公开

    公开(公告)号：EP3680507A1

    公开(公告)日：2020-07-15

    申请号：EP19151312.6

    申请日：2019-01-11

    申请人： NV Bekaert SA

    发明人： VERMEERSCH, Vincent ,  VANRANST, Philippe ,  VRAZIC, Igor ,  GHEKIERE, Pieter ,  BUCKLEY, Rob

    IPC分类号： F16F1/02 ,  B21C37/04 ,  C23C2/06 ,  C23C2/26 ,  C23C2/32 ,  F16F1/04 ,  C21D8/06 ,  C21D9/02

    摘要： The method for making a spring comprises the steps of providing a metal coated steel wire and forming the metal coated steel wire into a spring shape. The metal coated steel wire has a rectangular cross section with rounded edges. The rectangular cross section comprises four flat sides connected by the rounded edges. The metal coated steel wire comprises a steel core having a rectangular cross section with rounded edges, wherein the rectangular cross section comprises four flat sides connected by the rounded edges. The steel core consists out of a steel alloy consisting out of between 0.35 and 1% by mass of C, between 0.1 and 0.3% by mass of Si, between 0.4 and 1.20% by mass of Mn, the balance being iron and unavoidable impurities. The metal coated steel wire is made by wire drawing. The steel core has a drawn perlitic microstructure. The metal coated steel wire comprises a metallic coating layer. The metallic coating layer comprises an intermetallic layer contacting the steel core. The metallic coating layer comprises a drawn microstructure. The mass of the metallic coating layer is between 10 and 120 g/m 2 of the surface of the metal coated steel wire. The shape of the metal coating layer conforms with the shape of the steel core on the rounded edges of the rectangular shape of the steel core.