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在机械的松紧需要调节的机构中,松紧的调节,使螺钉无法拧紧,有时在工作中因振动脱落,使机构失去控制,甚至造成事故。为解决这个问题,可采用如图示结构的自锁防松螺钉。该螺钉与常规螺钉不同处,仅在螺纹的部分开了一个“十字槽”,并要求螺纹尾部的螺纹中径大于根部的螺纹中径,即尾部中径(螺距0.5～1mm,2级精度的螺纹)为:(d_2+t/5)_b~0其中d_2:螺纹中径;t:螺距;b:螺纹中径偏差。制造时其尾部中径尺寸由“十字槽”扩涨来实现。防松动原理当自锁防松螺钉拧入螺纹孔内时,不论自锁防松螺钉拧到什么位置,其自锁防松螺钉因尾部中径尺寸总是大于螺纹孔中径尺寸,而涨紧在螺纹孔内,这个压紧力使螺纹牙
In mechanical elastic adjustment mechanism, the elastic adjustment, the screw can not be tightened, sometimes in the work due to vibration off, so that institutions out of control, or even cause an accident. To solve this problem, the structure can be used as shown in the self-locking locking screws. The screw is different from the conventional screw, only a “cross groove” is opened in the threaded portion, and the thread diameter of the tail of the thread is greater than the diameter of the root of the thread, that is, the diameter of the tail (pitch 0.5-1mm, Thread) is: (d_2 + t / 5) _b ~ 0 Where d_2: thread diameter; t: pitch; b: thread diameter deviation. Manufacturing tail diameter size by the “cross slot” expansion to achieve. Anti-loosening principle Loose self-locking screw into the threaded hole, regardless of self-locking loose screw to what position, the self-locking loose screw because the tail diameter size is always larger than the size of the threaded hole diameter, In the tapped hole, this pressure makes the thread