Demountable window wheel

The utility model relates to a window wheel, which is a fitting for a sliding aluminum alloys door or window. The utility model is composed of an adjusting screw, an inner shell and a wheel; the inner shell and the wheel can be orderly sheathed in the outer shell; the inner shell and the wheel can be fixed by a wheel shaft; an oblique cut is arranged in the outer shell; oblique angles are arranged on both sides of the inner shell; the oblique angles corresponds to the oblique cut in the outer shell; the oblique angle on the inner shell can move from top to bottom along the oblique cut on the outer shell. A via hole is arranged between both sides of the inner shell; an elastic body can be inserted into the via hole and extends outside the inner shell, causing that the inner shell tightly adheres to the outer shell; the adjusting screw can penetrate through the outer shell and tightly push the inner shell. The utility model has rapid and convenient operation, relatively great loading capacity and preferable smoothness and can be replaced at any time.