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    • 2. 发明授权
    • Electromagnetic actuator
    • 电磁执行器
    • US6037851A
    • 2000-03-14
    • US244035
    • 1999-02-04
    • Matthias GramannMichael NagelThomas RocklRudolf Wilczek
    • Matthias GramannMichael NagelThomas RocklRudolf Wilczek
    • F01L9/04H01F7/08
    • F01L9/04
    • On a known electromagnetic actuator for valve control of an internal combustion engine an armature (1) is moved by magnetic force between the pole faces (21, 31) of an opening magnet (2) and a closing magnet (3) to activate an intake/exhaust valve (5). Owing to the work that has to be done when the intake/exhaust valve (5) is opened in order to counteract the high internal gas pressure in the combustion chamber the opening operation takes longer than the closing operation. The disclosed actuator permits faster opening of the intake/exhaust valve (5), in that the magnetic force exerted by the opening magnet (2) is increased for large stroke lengths (d.sub.o) in comparison with the magnetic force exerted by the closing magnet (3) on the armature (1) in conjunction with the same stroke length (d.sub.s) by the provision of a two-section connecting sleeve (7) enclosing the space between the pole faces (21, 31). This connecting sleeve (7) consists of a ferromagnetic sleeve section (70) attached to the opening magnet (2) and a nonferromagnetic sleeve section (71) attached to the closing magnet (3).
    • 在用于内燃机的阀门控制的已知的电磁致动器中,电枢(1)通过磁力在开启磁体(2)的极面(21,31)和闭合磁体(3)之间移动,以激活进气 排气阀(5)。 由于为了抵消燃烧室中的高内部气体压力而打开进气/排气阀5必须完成的工作,打开操作需要比关闭操作更长的时间。 所公开的致动器允许进气/排气阀(5)的更快的打开,因为与由闭合磁体施加的磁力相比,由开式磁体(2)施加的磁力增加用于大行程长度(do) 3)通过设置包围极面(21,31)之间的空间的两段连接套筒(7),结合相同的行程长度(ds)在电枢(1)上。 该连接套筒(7)由附着在开口磁体(2)上的铁磁套管部分(70)和附着于闭合磁铁(3)的非铁磁套筒部分(71)组成。