Anti-rotation structure of ball screw pair for drive-by-wire brake

The anti-rotation structure is used for limiting rotation of a lead screw nut of a ball screw pair and comprises an anti-rotation sleeve installed on a valve body and a fastener used for fixedly installing the anti-rotation sleeve on the valve body, a first counter bore used for fixing the anti-rotation sleeve is formed in the position, on the outer side of the anti-rotation sleeve, of the valve body, and a second counter bore used for fixing the anti-rotation sleeve is formed in the position, on the outer side of the anti-rotation sleeve, of the valve body. The bottom surface of the first counter bore is provided with a second counter bore formed by sinking downwards; one end of the fastener is provided with a stopper, the other end of the fastener is sequentially provided with an extrusion part and a guide rod along the axial direction, and one end of the guide rod close to the extrusion part is provided with a clamping groove recessed towards the central axis direction; the diameter of the extrusion part i