Supporting wheel shaft, supporting wheel and work machine

A supporting wheel shaft, comprising:

• an oil inlet, provided near a middle portion of the supporting wheel shaft and used to communicate with a first oil storage chamber on a wheel body of a supporting wheel;
• a first oil outlet and a second oil outlet, wherein the first oil outlet is provided close to a first end of the supporting wheel shaft and used to extend to a first floating oil seal on the supporting wheel, and the second oil outlet is provided close to a second end of the supporting wheel shaft and used to extend to a second floating oil seal on the supporting wheel;
• a lubricating oil passage, wherein the lubricating oil passage is provided inside the supporting wheel shaft and extends from the first end of the supporting wheel shaft to the second end of the supporting wheel shaft, the lubricating oil passage communicates with the oil inlet, the first oil outlet and the second oil outlet, respectively;
• wherein the first oil outlet and the second oil outlet are distributed on a same vertical plane and are both used to discharge oil in an upward direction;
• when the supporting wheel is walking and operating in an inclined state relative to an axis, lubricating oil stored in the first oil storage chamber flows to a lubricating environment of the floating oil seal at a low position, the lubricating oil on a high side flows to the first oil storage chamber and the floating oil seal on a low side through a clearance between the wheel body and the supporting wheel shaft when an oil level of the lubricating oil on the high side is lower than the first oil outlet or the second oil outlet on the high side;
• and the lubricating environment of the floating oil seal on the previous high side replenishes the lubricating oil through an oil passage on the supporting wheel shaft when the supporting wheel is back to the horizontal state.