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1.发明公开HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINE 审中-公开HYDRAULISCHE ANTRIEBSVORRICHTUNGFÜREINE BAUMASCHINE
公开(公告)号：EP3076027A1
公开(公告)日：2016-10-05
申请号：EP14866109.3
申请日：2014-11-26
CPC分类号： E02F9/2235 , E02F3/325 , E02F9/2228 , E02F9/2232 , E02F9/2267 , E02F9/2292 , E02F9/2296 , F15B11/17 , F15B13/025 , F15B13/026 , F15B13/0803 , F15B20/007 , F15B2211/20523 , F15B2211/20546 , F15B2211/20553 , F15B2211/20576 , F15B2211/25 , F15B2211/6652 , F15B2211/6655
摘要： It is an object of the present invention to accurately detect the absorption torque of the other of two hydraulic pumps by a purely hydraulic structure and feed the absorption torque to one of the two hydraulic pumps, thereby to accurately perform a total torque control, effectively utilize a rated output torque of a prime mover, and enhance mountability. To achieve the object, there are provided: a torque feedback circuit 31 to which the delivery pressure of a first hydraulic pump 1a and a load sensing drive pressure are introduced, which modifies the delivery pressure of a second hydraulic pump 1b to provide a characteristic simulating the absorption torque of the second hydraulic pump 1b, and which outputs the modified pressure; and torque feedback pistons 32a, 32b to which the output pressure of the torque feedback circuit 31 is introduced, and which control the capacity of the first hydraulic pump 1a to decrease the capacity of the first hydraulic pump 1a and decrease a maximum torque T1max as the output pressure becomes higher. The torque feedback circuit 31 includes pressure dividing restrictor parts 34a, 34b, pressure dividing valves 35a, 35b, and relief valves 37a, 37b.
摘要翻译： 本发明的目的是通过纯水力结构精确地检测两个液压泵中的另一个的吸收扭矩，并将吸收扭矩馈送到两个液压泵中的一个，从而精确地执行总转矩控制，有效地利用 原动机的额定输出转矩，并增强了安装性。 为了实现该目的，提供了一种扭矩反馈电路31，第一液压泵1a的输送压力和负载感测驱动压力被引入到该扭矩反馈电路31，该第二液压泵1b的输送压力改变第二液压泵1b的输送压力，以提供模拟的特性 第二液压泵1b的吸收转矩，并输出修正压力; 以及引入扭矩反馈回路31的输出压力的扭矩反馈活塞32a，32b，并且控制第一液压泵1a的容量，以降低第一液压泵1a的容量，并将最大转矩T1max减小为 输出压力变高。 扭矩反馈回路31包括分压限制部34a，34b，分压阀35a，35b，溢流阀37a，37b。
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