TOOL WITH REDUCED HYDRAULIC OIL EXCHANGE Russian patent published in 2017 - IPC A01B73/04 A01B63/12 A01B63/22 F15B1/02 

FIELD: agriculture.

SUBSTANCE: frame has seven sections in the position for use in the field and nine sections in the folded position. The frame construction allows the frame having the width more than 27 m to be folded into the transport position having the width of less than eight meters and the height of less than six metres. The hydraulic system is used to carry the weight to the main or central frame section during folding and unfolding in order to increase the frame stability. The hydraulic system uses one or more accumulators to minimize the amount of oil reduction in the tractor tank, caused by the extension of the hydraulic cylinders of the tool. The time periods of the tool raising and lowering cycle are minimized due to providing the second auxiliary cylinder for lifting the main section of the frame when the weight of the entire tool is on the main section and for enabling the use of a smaller cylinder for lifting the main frame section in the position for use in the field and shortening the time periods of the tool raising and lowering cycle for turns in the field.

EFFECT: increasing the frame stability during the folding process and reducing the load on the inner wheel assemblies.

6 cl, 17 dwg