Oil release mechanism for lightweight jack

An improved oil release mechanism for a lightweight jack, comprises an oil pump body, wherein the oil pump body is provided with at least one valve chamber, one moving chamber, one oil storage chamber, and one oil return passage;

• the valve chamber is located in a middle of the oil return passage and is connected to the oil return passage;
• two ends of the oil return passage are respectively connected to the oil storage chamber and the moving chamber;
• and a main body of the oil pump is hinged with a pump lever;
• an oil drain valve, set inside the valve chamber and provided with a driving part extending to an outside of the valve chamber;
• a rotation shaft, axially set in an inner chamber of the pump lever and positioned with the pump lever for rotation;
• and
• a transmission component, configured to transmit power of the rotation shaft to drive an opening and closing of the oil drain valve, wherein the transmission component comprises a first gear rotatably assembled on a base formed on one side of the oil pump body;
• an universal joint, with its two ends respectively connected to the first gear and a first end of the rotation shaft;
• and a second gear coaxially arranged with the driving part and meshed with the first gear.