Patent ID: 6932436

Claim:
A hydraulic wheel system comprising: a disc coupled to a drive shaft and being provided with a first cylinder and a second cylinder that communicate with each other and are filled with an operating fluid; a first piston that is slidably disposed within the first cylinder such that the operating fluid moves to the second cylinder from the first cylinder in response to a movement thereof; a wheel coupled to the disc so that a rotational force of the disc is transmitted to the wheel; a tire coupled to the wheel; a dismount button slidably coupled to the wheel and configured to move the first piston in response to a movement thereof; and a wheel mounting member provided in the disc, a second piston that is slidably disposed within the second cylinder being integrated with the wheel mounting member so that the wheel mounting member is able to move in a predetermined direction in response to a pressure of the operating fluid in the second piston, the wheel mounting member being elastically supported by an elastic member in a direction opposite to the predetermined direction, the wheel mounting member being configured to be selectively connected to the wheel in response to a movement thereof.