联轴器又称联轴节。用来将不同机构中的主动轴和从动轴牢固地联接起来一同旋转，并传递运动和扭矩的机械部件。有时也用以联接轴与其他零件（如齿轮、带轮等）。常由两半合成，分别用键或紧配合等联接，紧固在两轴端，再通过某种方式将两半联接起来。联轴器可兼有补偿两轴之间由于制造安装不精准、工作时的变形或热膨胀等原因所发生的偏移（包括轴向偏移、径向偏移、角偏移或综合偏移）；以及缓和冲击、吸振。 The coupling is used to firmly connect the driving shaft and the driven shaft in different mechanisms to rotate together and transmit motion and torque. Sometimes it is also used to connect shafts and other parts (such as gears, pulleys, etc.). It is often composed of two halves, which are connected by a key or tight fit, respectively, and fastened to the ends of the two shafts, and then the two halves are connected in some way. The coupling can also compensate for the deviation between the two shafts due to inaccurate manufacturing and installation, deformation or thermal expansion during work, etc. (including axial deviation, radial deviation, angular deviation or comprehensive deviation) ; And alleviate the impact and absorb vibration.