Abstract: An automatic chain cleaner comprises a power source; a first transmission system connected to the power source; a second transmission system; a waste liquid collecting tray connected to the first transmission system for collecting waste liquid; a filter net being installed at a front end of the liquid draining tube for filtering impurities from the waste liquid; a brush roller connected to the waste liquid collecting tray; the rotary shaft being driven by the first transmission system to rotate; the hairs of the brush roller for brushing a chain of a bicycle; a cleaning liquid reservoir filled with cleaning liquid; a pump installed in the cleaning liquid reservoir and connected to the second transmission system and being driven by the second transmission system for pumping cleaning liquid out of the cleaning liquid reservoir; and an upper end of the cleaning liquid reservoir being extended with a nozzle.

Abstract: An automatic bicycle freewheel wiper comprises a casing having a receiving space for receiving other elements; a battery for supplying power to other elements; the battery being received within the casing; a motor having one end connected to a power wire which is further connected to the battery; the motor being receiving within the casing; a rotary shaft driven by the motor through a transferring mechanism so that when the motor rotates, the rotary shaft will rotate; and a retaining shaft. A cleaning sheet winds around the two rotary shafts to clean the dirt and grease out from the freewheel.