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1. 发明公开

EP0502748A1 Impact Wrench having Torque Controlling Faculty 失效
标题翻译： Schlagschrauber mit Drehmomentreglung。
公开(公告)号：EP0502748A1
公开(公告)日：1992-09-09
申请号：EP92301947.5
申请日：1992-03-06
申请人： NISSAN MOTOR COMPANY LIMITED , URYU SEISAKU LIMITED
发明人： Maruyama, Junichi , Fukumura, Teruo , Kawaguchi, Sadatsugu, c/o Uryu Seisaku Ltd.
IPC分类号： B25B23/145 , G01L3/10
CPC分类号： B25B23/1456 , B25B23/1453 , G01L3/102 , G01L3/105
摘要： An air motor (3) generates primary torque, an oil pressure pulse generating unit (4) converts the primary torque into a pulsatory secondary torque, which is applied to a main spindle (16), a transducer (5) detects the secondary torque, and a shut-off valve (21) is closed to stop supply of compressed air to the motor (3) when the secondary torque exceeds a predetermined threshold value. The spindle (16) is made of magnetostrictive material and its distortion is detected by a pair of coils (17a,17b) arranged in opposition to the spindle (16). The coils (17a,17b) are connected into a bridge circuit together with resistors (27a,27b) and an exciting current having a sinusoidal waveform is supplied to one set of diagonal points (A,B) of the bridge circuit. The voltage appearing across the other set of diagonal points (C,D) is detected to produce a torque detection signal which represents the secondary torque. The torque detection signal is sampled and held at a predetermined phase which is fixedly related to a phase of the exciting current, to produce a torque measurement signal which represent a peak value of the secondary torque applied to the spindle (16).
摘要翻译：一个气动马达（3）产生一次转矩，一个油压脉冲发生单元（4）将一次转矩转换成一个施加到主轴（16）的脉动二次转矩，换能器（5）检测二次转矩，并且当二次转矩超过预定阈值时，截止阀21关闭以停止向马达（3）供应压缩空气。主轴（16）由磁致伸缩材料制成，其变形由与主轴（16）相对布置的一对线圈（17a，17b）检测。线圈（17a，17b）与电阻（27a，27b）一起连接到桥式电路中，并且具有正弦波形的励磁电流被提供给桥式电路的一组对角点（A，B）。检测到出现在另一组对角点（C，D）上的电压以产生表示二次转矩的转矩检测信号。转矩检测信号被采样并保持在与励磁电流的相位固定相关的预定相位，以产生表示施加到主轴（16）的次级转矩的峰值的转矩测量信号。

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