Detachable window wheel

The utility model relates to a window wheel, which is a fitting for sliding aluminium alloy doors and windows; an adjusting screw is orderly sheathed on an inner shell and a wheel in an outer shell; the inner shell and the wheel can be fixed by a wheel shaft; both faces of the outer shell is provided with slopes; the wheel can move from top to bottom along the slopes on the outer shell. Screw holes are arranged on the same sides of the outer shell and the inner shell; the adjusting screw can penetrate through the screw hole of the outer shell and tightly pull the inner shell. The inner and the outer shells of the window wheel are independent; therefore, only the adjusting screw is unscrewed, when the window wheel is replaced, the inner shell and the wheel which is connected with the inner shell into the integration can be replaced; the operation is convenient and rapid; the amplitude of lift is larger; the detachable window wheel can be replaced at any time.