1：丝杆一端固定，另一端支承。固定端轴承同时承受轴向力和径向力；支承端轴承只承受径向力，而且能作微量的轴向浮动，其优点是可以避免或减少滚珠丝杆因自重而出现的弯曲。同时丝杠热变形可以自由地向一端伸长。

　　1: The screw rod is fixed at one end and supported at the other. Fixed-end bearings bear both axial and radial forces; support-end bearings only bear radial forces, and can make a small amount of axial floating, which has the advantage of avoiding or reducing the bending of ball screw due to self-weight. At the same time, the thermal deformation of the lead screw can extend freely to one end.

　　2：丝杆一端固定，一端无支撑。固定端轴承同时承受轴向力和径向力。这种支承方式用于行程小的短丝杠，其优点是较易组装，几何精度影响较小，适用于短螺杆和垂直螺杆；但是也有一定的缺点，作用点间的间隔较小，刚性较差。

　　2: The screw rod is fixed at one end and has no support at the other. Fixed end bearings bear both axial and radial forces. This support method is used for short lead screw with small stroke. It has the advantages of easy assembly, less influence on geometric accuracy, and is suitable for short screw and vertical screw. However, it also has some disadvantages, such as small interval between action points and poor rigidity.

　　3：采用滚珠丝杆固定、螺母旋转的传动方式。螺母一边转动、一边沿固定的滚珠丝杆作轴向移动：由于滚珠丝杆不动，可避免受临界转速的限制，避免了细长滚珠丝杆高速运转时出现的种种题目。其优点是螺母惯性小、运动灵活，可实现的转速高。可以对滚珠丝杆施加较大的预拉力，提升滚珠丝杆支承刚度，补偿螺杆的热变形。

　　3: The ball screw is fixed and the nut rotates. The nut rotates while moving along the fixed ball screw. Because the ball screw does not move, it can avoid the restriction of critical speed and avoid various problems when the slender ball screw runs at high speed. Its advantages are small inertia, flexible movement and high speed. The ball screw can be pre-tensioned to increase its supporting stiffness and compensate for its thermal deformation.
                       

　　4：丝杆两端均固定。固定端轴承都可以同时承受轴向力和径向力，这种支承方式，可以对滚珠丝杆施加适当的预拉力，提升滚珠丝杆支承刚度，可以部分补偿滚珠丝杆的热变形。其优点是：作用点间的间隔较大，刚性较佳；但是缺点也不可避免，较易受组合零件几何精度影响。

　　4: Both ends of the screw rod are fixed. Fixed-end bearings can bear both axial and radial forces. This support mode can exert appropriate pre-tension force on the ball screw, enhance the support stiffness of the ball screw, and partly compensate the thermal deformation of the ball screw. Its advantages are that the spacing between the action points is large and the rigidity is better, but its disadvantages are unavoidable, and it is easy to be affected by the geometric accuracy of the combined parts.