Patent ID: 7886768

Claim:
A hydraulic fluid tank comprising: a tank main member of a box-shaped member including a pair of vertical divider plates, and a horizontal divider plate that are located in an interior thereof, the horizontal divider plate vertically dividing a part between said vertical divider plates, wherein the interior of the tank main member is divided into a first chamber outside of one of the vertical divider plates, a second chamber of an upper divided part between the vertical divider plates, a third chamber outside of the other of vertical divider plates and a fourth chamber of a lower divided part between the vertical divider plates, wherein said first chamber is provided with a return port that is opened therein, and said fourth chamber is provided with a drawing port that is opened therein, each of the vertical divider plates including at least one hole to guide a majority of hydraulic fluid entered into the hydraulic fluid tank from the return port from the first chamber to the second chamber, from the second chamber to the third chamber, and from the third chamber to the fourth chamber to reach the drawing port.