用于电动工具中，将旋转运动转换为往复运动的驱动机构。
专利摘要
一种用于电动工具的驱动机构，该电动工具具有壳体、电机和以往复运动移动的输出轴。该驱动机构包括：齿轮板（34），适于绕第一轴线（Z-Z）旋转并具有垂直于第一轴线延伸的多个细长第一齿（33）；以及驱动转换机构，与齿轮板（34）配合，以响应于齿轮板绕第一轴线的旋转而引起输出轴的往复运动。具有往复运动输出轴的常规驱动机构通常具有齿与齿轮旋转轴线成45°形成的锥齿轮。通过提供齿轮板和驱动转换机构，为输出轴提供往复驱动力，且齿与齿轮旋转轴线成90°形成，齿轮更便宜且更容易制造，因为齿轮齿不必像现有技术的倾斜齿轮齿那样精确地形成。此外，齿轮板不需要相对于驱动它的齿轮如此精确地定位，因为在相互啮合的齿的方向上的一些纵向移动是可能的，而不会使齿轮停止正确运行。
Original abstractA drive mechanism for a power tool having a housing, a motor, and an output shaft moving in a reciprocating motion. The drive mechanism comprises a gear plate ( 34 ) adapted to rotate about a first axis (Z-Z) and having a plurality of elongate first teeth ( 33 ) extending perpendicular to the first axis; and a drive conversion mechanism cooperating with the gear plate ( 34 ) to cause reciprocating movement of the output shaft in response to rotation of the gear plate about the first axis. Conventional drive mechanisms having an output shaft with a reciprocating motion generally have bevel gears with teeth formed at 45° to the axis of rotation of the gears. By providing a gear plate and a drive conversion mechanism which provides a reciprocating drive force for an output shaft with teeth formed at 90° to the axis of rotation of the gear, the gear is cheaper and easier to make as the gear teeth do not have to be formed as accurately as prior art inclined gear teeth. Also, the gear plate does not need to be as accurately located relative to the gear driving it, since some longitudinal movement in the direction of the mutually engaging teeth is possible without the gears ceasing to function correctly.
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