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在机械设计中,由于曲柄机构可以很容易地把旋转运动转变为直线运动,或者把直线运动转变为旋转运动,所以人们经常采用曲柄机构。但是,在把直线运动转变为旋转运动时,其缺点在于有死点,为了解决这个问题,要采取各种各样的办法。如图3—39所示是一种用简单的机构就可解决这个问题的没有死点的曲柄机构。滑动板与活塞杆相连结,通过滑动板上的曲线形长孔与曲柄销使曲柄轮转动。在曲柄销的左右死点位置上,由于滑动板的曲线形长孔的斜面与曲柄销接触,所以就没有一般曲柄机构的死点问题。由于曲线形长孔的倾斜方向,而使曲柄轴的旋转方向保持一定。
In mechanical design, the crank mechanism is often used because the crank mechanism can easily convert rotary motion to linear motion or linear motion to rotational motion. However, when converting linear motion into rotational motion, the disadvantage is that there is a dead center. To solve this problem, a variety of approaches have to be taken. Figure 3-39 shows a dead-end crank mechanism that can solve this problem with a simple mechanism. The sliding plate is connected with the piston rod, and the crank wheel rotates through the curved long hole on the sliding plate and the crankpin. At the left and right dead center positions of the crankpin, there is no problem with the dead point of the crank mechanism generally because the sloped surface of the curved elongate hole of the slide plate makes contact with the crankpin. The direction of rotation of the crankshaft is kept constant due to the inclination of the curved elongated hole.