The invention belongs to the field of agricultural machinery, and discloses a load-sensitive hydraulic control valve bank, a tractor hydraulic system and a tractor. The load-sensitive hydraulic control valve set comprises a main valve which is connected with a main oil inlet oil way, a main oil return oil way and a load feedback oil way. The switch control valve is arranged in a communicating oil way of the main oil inlet oil way and the main oil return oil way; the switch control valve is arranged to disconnect the communicating oil way when the oil inlet oil pressure of the main oil inlet oil way is lower than the set oil inlet pressure, and control the oil inlet oil pressure to be in direct proportion to the real-time load oil pressure when the real-time load oil pressure of the load feedback oil way is larger than the first set load oil pressure. In a tractor hydraulic system, a metering pump is connected with a main oil inlet of a load-sensitive hydraulic control valve set, and oil is supplied to a main valve through a main oil inlet way. And the load-sensitive hydraulic control valve group can also be connected with an auxiliary hydraulic system. According to the constant displacement pump hydraulic system, combination of the constant displacement pump and the load-sensitive valve is achieved, the energy loss of the system is reduced, and a Power Beyond functional interface is additionally arranged for the constant displacement pump hydraulic system.
本申请属于农用机械领域,公开了一种负载敏感液压控制阀组、拖拉机液压系统和拖拉机。负载敏感液压控制阀组包括主阀,连接有主进油油路、主回油油路和负载反馈油路;开关控制阀,设置在主进油油路与主回油油路的连通油路中;开关控制阀设置为在主进油油路的进油油压低于设定进油压力时断开连通油路,且在负载反馈油路的实时负载油压大于第一设定负载油压时,控制进油油压与实时负载油压成正比。拖拉机液压系统中,定量泵与负载敏感液压控制阀组的主进油口相连,并通过主进油油路为主阀供油。负载敏感液压控制阀组还可连接副液压系统。本申请实现了定量泵与和负载敏感阀的组合,降低了系统能量损失,还给定量泵液压系统增加了Power Beyond功能接口。
Load-sensitive hydraulic control valve bank, tractor hydraulic system and tractor
负载敏感液压控制阀组、拖拉机液压系统和拖拉机
2025-03-04
Patent
Electronic Resource
Chinese
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