| 摘要 |
<p>PURPOSE: A regulator for a negative flow control system of a mini excavator is provided to control the inclination of a swash plate of a main pump using a negative signal according to the spool switch stroke for each working apparatus. CONSTITUTION: A regulator for a negative flow control system of a mini excavator comprises a chamber(121) and a negative flow control piston. The chamber is installed in a main pump(110) of a negative flow control system of a mini excavator. The negative flow control piston is installed in the chamber and connected to a swash plate(115) of a main pump. A first force is applied to a side of the piston with the pressure provided from the main pump and the pressure provided from a gear pump. A second force is applied to the other side of the piston with the negative pressure which is formed in proportion to the bypass flow rate from a negative pressure forming device of a main control valve. If the second force is greater than the first force, the piston is moved to reduce the inclination of the swash plate, thereby reducing the flow rate discharged from the main pump.</p> |
