| 摘要 |
<p>PCT No. PCT/FI83/00024 Sec. 371 Date Nov. 3, 1983 Sec. 102(e) Date Nov. 3, 1983 PCT Filed Mar. 15, 1983 PCT Pub. No. WO83/03285 PCT Pub. Date Sep. 29, 1983.The invention concerns a means for saving energy in a hydraulic circuit where pressurized oil supplied by a hydraulic pump is used to activate various functions by the aid of one or several valves (2,3,4) controlling the function. Such a hydraulic circuit is especially suitable for use in agricultural tractors, where the pressurized oil comes from a hydraulic pump driven by the engine. In conventional hydraulic circuits, a drawback is that the pressurized oil is directed through a pressure regulating valve, thereby causing unnecessary waste of energy and a need to cool the oil. This drawback is eliminated, as taught by the invention, in that a free circulation valve (1) is connected into the hydraulic circuit to cooperate with the valves (2,3,4) controlling the different functions in such manner that when at least one of the function-controlling valves (2,3,4) is open the free circulation valve (1) is closed and that when all function-controlling valves (2,3,4) are closed the free circulation valve (1) is open.</p> |
