Importance

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Abstract

The automatic oil return structure includes a piston assembly and a main body assembly. The piston assembly comprises an inner tube, an outer tube, and a displacement unit. The main body assembly comprises a first main section fluidly communicating with an oil storage container, a controlling assembly, an operating plug, and a switch channel fluidly communicating with the first main section, a pressurization channel, and an oil returning channel. When the pressure of the first main section achieves a maximum pressure, the pressure pushes the controlling assembly and the operating plug, and the oil storage container fluidly communicates with the first main section, lowering the pressure of the first main section. A switch assembly is moved to isolate the switch channel from the first main section, such that the switch channel fluidly communicates with the oil returning channel and the hydraulic oil keeps returning to the oil storage container.

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First Claim