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公开(公告)号：US20160265561A1
公开(公告)日：2016-09-15
申请号：US15030384
申请日：2014-11-26
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Kiwamu TAKAHASHI , Yasutaka TSURUGA , Yoshifumi TAKEBAYASHI , Kazushige MORI , Natsuki NAKAMURA , Yasuharu OKAZAKI , Hiroyuki NOBEZAWA , Kenji YAMADA
CPC classification number: F15B11/165 , E02F3/325 , E02F3/964 , E02F9/2066 , E02F9/2228 , E02F9/2235 , E02F9/2267 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/17 , F15B13/026 , F15B13/06 , F15B20/007 , F15B2211/20523 , F15B2211/20546 , F15B2211/20553 , F15B2211/20576 , F15B2211/6652 , F15B2211/6655
Abstract: The object is to make it possible to efficiently utilize rated output torque of the prime mover by performing total torque control with high precision through precise detection of absorption torque of the other hydraulic pump by use of a purely hydraulic structure and feedback of the absorption torque to one hydraulic pump's side. For this purpose, the hydraulic drive system is equipped with: a torque feedback circuit 112v which is supplied with delivery pressure of a main pump 202 and load sensing drive pressure, modifies the delivery pressure of the main pump 202 to achieve a characteristic simulating the absorption torque of the main pump 202, and outputs the modified pressure; and a torque feedback piston 112f which is supplied with an output pressure of the torque feedback circuit and controls displacement of a main pump 102 so as to decrease the displacement of the main pump 102 and thereby decrease maximum torque T12max as the output pressure increases.
Abstract translation: 目的是通过使用纯水力结构和吸收扭矩的反馈来精确地检测另一液压泵的吸收扭矩，通过高精度地执行总转矩控制来有效地利用原动机的额定输出转矩 一个液压泵的一侧。 为此，液压驱动系统配备有：被供应主泵202的输送压力和负载感测驱动压力的扭矩反馈电路112v，改变主泵202的输送压力，以实现模拟吸收的特性 主泵202的转矩，输出修正压力; 以及扭矩反馈活塞112f，其被提供有扭矩反馈回路的输出压力并且控制主泵102的位移，以便减小主泵102的位移，从而随着输出压力增加而减小最大扭矩T12max。
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公开(公告)号：US20160258133A1
公开(公告)日：2016-09-08
申请号：US15027016
申请日：2014-11-26
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Yasutaka TSURUGA , Kiwamu TAKAHASHI , Yasuharu OKAZAKI , Hiroyuki NOBEZAWA , Kenji YAMADA
CPC classification number: 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
Abstract: 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.
Abstract translation: 本发明的目的是通过纯粹的液压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 原动机的额定输出扭矩，并增强了安装性。 为了实现该目的，提供了：引入第一液压泵1a的输出压力和负载感测驱动压力的扭矩反馈电路31，其改变第二液压泵1b的输送压力，以提供模拟的特性 第二液压泵1b的吸收扭矩，并输出修正压力; 以及引入扭矩反馈回路31的输出压力的转矩反馈活塞32a，32b，并且控制第一液压泵1a的容量降低第一液压泵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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公开(公告)号：US20160333900A1
公开(公告)日：2016-11-17
申请号：US15030383
申请日：2014-11-26
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Kiwamu TAKAHASHI , Yasutaka TSURUGA , Kazushige MORI , Yoshifumi TAKEBAYASHI , Natsuki NAKAMURA , Yasuharu OKAZAKI , Kenji YAMADA
CPC classification number: F15B13/06 , E02F3/325 , E02F9/2235 , E02F9/2267 , E02F9/2292 , E02F9/2296 , F15B11/161 , F15B11/17 , F15B2211/20507 , F15B2211/20523 , F15B2211/20546 , F15B2211/20553 , F15B2211/20576 , F15B2211/253 , F15B2211/255 , F15B2211/2656 , F15B2211/50554 , F15B2211/6355 , F15B2211/67
Abstract: The object is to make it possible to efficiently utilize rated output torque of the prime mover by performing total torque control with high precision through precise detection of absorption torque of the other hydraulic pump by use of a purely hydraulic structure and feedback of the absorption torque to the one hydraulic pump's side. For this purpose, the hydraulic drive system is equipped with: a torque feedback circuit 112v which is supplied with delivery pressure of a main pump 202 and load sensing drive pressure, modifies the delivery pressure of the main pump 202 to achieve a characteristic simulating the absorption torque of the main pump 202, and outputs the modified pressure; and a torque feedback piston 112f which is supplied with output pressure of the torque feedback circuit and controls displacement of a main pump 102 so as to decrease the displacement of the main pump 102 and thereby decrease maximum torque T12max as the output pressure increases. The torque feedback circuit 112v includes first and second variable pressure reducing valves 112g and 112q.
Abstract translation: 目的是通过使用纯水力结构和吸收扭矩的反馈来精确地检测另一液压泵的吸收扭矩，通过高精度地执行总转矩控制来有效地利用原动机的额定输出转矩 一个液压泵的一侧。 为此，液压驱动系统配备有：被供应主泵202的输送压力和负载感测驱动压力的扭矩反馈电路112v，改变主泵202的输送压力，以实现模拟吸收的特性 主泵202的转矩，输出修正压力; 以及扭矩反馈活塞112f，其被提供有扭矩反馈回路的输出压力并控制主泵102的位移，以便减小主泵102的位移，从而随着输出压力的增加而减小最大转矩T12max。 扭矩反馈电路112v包括第一和第二可变减压阀112g和112q。
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