The invention discloses a novel lower truck hydraulic system and engineering machinery, and relates to the technical field of engineering machinery. The novel lower truck hydraulic system comprises aselector valve, a reversing valve, a first overflow valve, an oil return pipeline and a first supporting leg oil cylinder, the selector valve is connected with the reversing valve, the first overflowvalve, the oil return pipeline and a large cavity connector of the first supporting leg oil cylinder correspondingly, the oil return pipeline is further connected with the reversing valve and the first overflow valve correspondingly, a small cavity connector of the first supporting leg oil cylinder is connected with the reversing valve; and when the selector valve is located at a first working position, the reversing valve, the first overflow valve, the oil return pipeline and the large cavity connector of the first supporting leg oil cylinder do not communicate with one another, and when theselector valve is located at a second working position, the reversing valve, the first overflow valve and the large cavity connector of the first supporting leg oil cylinder communicate in the inner part of the selector valve. The provided novel lower truck hydraulic system can be used for carrying out pressure-bearing limitation on the first supporting leg oil cylinder, so that the first supporting leg oil cylinder is prevented from being deformed and damaged due to overlarge pressure bearing.
本发明公开了一种新型下车液压系统及工程机械,涉及工程机械技术领域。该新型下车液压系统包括选择阀、换向阀、第一溢流阀、回油管路及第一支腿油缸,选择阀分别与换向阀、第一溢流阀、回油管路及第一支腿油缸的大腔接口连接,回油管路还分别与换向阀及第一溢流阀连接,第一支腿油缸的小腔接口与换向阀连接;当选择阀处于第一工作位时,换向阀、第一溢流阀、回油管路及第一支腿油缸的大腔接口相互之间不连通;当选择阀处于第二工作位时,换向阀、第一溢流阀及第一支腿油缸的大腔接口在选择阀的内部连通。本发明提供的新型下车液压系统能够对第一支腿油缸进行承压限制,防止第一支腿油缸因承压过大而变形损坏。
Novel lower truck hydraulic system and engineering machinery
一种新型下车液压系统及工程机械
2020-08-14
Patent
Elektronische Ressource
Chinesisch
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