Ground vehicles hydraulic system pneumatic hydraulic valve

Abstract

Abstract Hydraulic systems equipped with working bodies hydraulic drives are widely used in ground vehicles. The researches show that one of the modern hydraulic drives problems is the destruction of flexible high-pressure hoses and the unauthorized pressure fluid discharge into the atmosphere. The analysis of the machines hydraulic drive protecting existing methods shows that the urgency of their improvement problem remains, since, for most of them the loss is between 3 and 10 l when operating, for example, pneumatic electric protection system - 6 … 8 l., float protection system is up to 10 l. As can be seen from the analysis, after the protection system locking device actuation leakage of the pressure fluid is preserved. The hydromechanical hydraulic drive protection system is the closest in technical essence and the achieved technical result. However, it also has a disadvantage, for example, when the locking device is actuated a hydraulic shock occurs, and leads to an oscillatory process of the plunger, an increase in the overlap time of the damaged hydraulic line, a decrease in the speed of the locking device and its operational reliability. To eliminate these shortcomings, the authors propose a new technical solution.