公开(公告)号：US20040255475A1

公开(公告)日：2004-12-23

申请号：US10874602

申请日：2004-06-23

Applicant: Makita Corporation

Inventor： Shinji Hirabayashi ,  Kenji Kobayashi

IPC: F16H021/44

CPC classification number: B23D51/16 ,  Y10T74/18248

Abstract: It is an object of the present invention to provide a useful technique for effectively reducing vibration in a reciprocating power tool with a simple structure. According to the present invention, a representative reciprocating power tool includes a motor, a tool bit, a slider, a motion converting mechanism and a counter weight. The tool bit performs a predetermined operation by reciprocating. The slider reciprocates to drive the tool bit. The motion converting mechanism converts a rotating output of the motor into a reciprocating movement of the slider. The counter weight is provided in the motion converting mechanism. Further, the counter weight reciprocates in a direction opposite to the reciprocating direction of the slider. The phase difference between the reciprocating movement of the slider and the reciprocating movement of the counter weight is set such that a time lag is provided between the instant when the slider reaches a top dead center and the instant when the counter weight reaches a bottom dead center. With such construction, timing for reducing the kinetic energy caused by the reciprocating movement of the slider can be optimized, taking into account a cutting resistance that the tool bit receives from the workpiece during operation.

Abstract translation: 本发明的目的是提供一种用于有效减少具有简单结构的往复动力工具中的振动的有用技术。 根据本发明，代表性的往复动力工具包括马达，工具钻头，滑块，运动转换机构和配重。 工具位通过往复运动执行预定的操作。 滑块往复运动以驱动刀头。 运动转换机构将电动机的旋转输出转换成滑块的往复运动。 配重设在运动转换机构中。 此外，配重在与滑块的往复运动方向相反的方向上往复运动。 滑块的往复运动与配重的往复运动之间的相位差被设定为使得在滑块到达上止点的时刻和当配重达到下止点时的时刻 。 通过这样的结构，考虑到刀具在工作过程中从工件接收的切削阻力，可以优化用于减小由滑块往复运动引起的动能的定时。