公开(公告)号：US06397591B1

公开(公告)日：2002-06-04

申请号：US09601518

申请日：2000-08-02

申请人： Yasutaka Tsuruga ,  Takashi Kanai ,  Junya Kawamoto ,  Kenichiro Nakatani ,  Kiwamu Takahashi ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

发明人： Yasutaka Tsuruga ,  Takashi Kanai ,  Junya Kawamoto ,  Kenichiro Nakatani ,  Kiwamu Takahashi ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

IPC分类号： F15B1306

CPC分类号： E02F9/128 ,  E02F3/325 ,  E02F3/964 ,  E02F9/123 ,  E02F9/2207 ,  E02F9/2267 ,  E02F9/2271 ,  E02F9/2296 ,  F15B11/0406 ,  F15B11/162 ,  F15B2211/20553 ,  F15B2211/251 ,  F15B2211/30505 ,  F15B2211/30535 ,  F15B2211/3111 ,  F15B2211/50518 ,  F15B2211/5153 ,  F15B2211/6054 ,  F15B2211/7053 ,  F15B2211/7058 ,  F15B2211/71 ,  F15B2211/75

摘要： A hydraulic drive system includes a pump control unit 18 for controlling a pump delivery rate such that a pump delivery pressure is held at a predetermined value higher than a maximum load pressure among actuators 2-6. Pressure compensating valves 12-16 are each constructed to set, as a target compensation differential pressure, a differential pressure between the delivery pressure of a hydraulic pump 1 and the maximum load pressure among the actuators 2-6. The pressure compensating valve 12 is given such a load dependent characteristic that the target compensation differential pressure is reduced when a load pressure rises. A lower limit setting spring 55 for limiting the target compensation differential pressure from becoming smaller than a predetermined value is provided in the pressure compensating valve 12 for the swing section.

摘要翻译： 液压驱动系统包括泵控制单元18，用于控制泵输送速率，使得泵输送压力保持在高于致动器2-6之间的最大负载压力的预定值。 压力补偿阀12-16各自被构造成将作为目标补偿压差的液压泵1的输送压力和致动器2-6中的最大负载压力之间的压差设定为目标补偿压力。 压力补偿阀12具有这样的负载相关特性，即当负载压力升高时目标补偿压差降低。 用于将目标补偿压差限制在小于预定值的下限设定弹簧55设置在用于摆动部分的压力补偿阀12中。

公开(公告)号：US06526747B2

公开(公告)日：2003-03-04

申请号：US09936812

申请日：2001-09-18

申请人： Kenichiro Nakatani ,  Takashi Kanai ,  Yasutaka Tsuruga ,  Junya Kawamoto ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

发明人： Kenichiro Nakatani ,  Takashi Kanai ,  Yasutaka Tsuruga ,  Junya Kawamoto ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

IPC分类号： F16D3102

CPC分类号： F15B11/167 ,  E02F9/22 ,  E02F9/2225 ,  E02F9/2232 ,  E02F9/226 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/05 ,  F15B11/165 ,  F15B2211/20553 ,  F15B2211/20584 ,  F15B2211/253 ,  F15B2211/30505 ,  F15B2211/30535 ,  F15B2211/30555 ,  F15B2211/3105 ,  F15B2211/3144 ,  F15B2211/31576 ,  F15B2211/324 ,  F15B2211/329 ,  F15B2211/355 ,  F15B2211/40507 ,  F15B2211/6054 ,  F15B2211/6055 ,  F15B2211/6346 ,  F15B2211/6355

摘要： An actuator lock switching valve 50 is provided which communicates a drain line 52 and a pilot line 53 with each other when the valve 50 is in a position C, and which communicates pilot lines 51, 53 with each other when it is shifted to a position D. The pilot line 51 is connected to a delivery line 7 of a hydraulic pump 10, and the pilot line 53 is connected to pressure receiving sections 28a, 28b provided at ends of the pressure compensating valves 21a, 21b on the side acting in the closing direction. The actuator lock switching valve 50 has a pressure receiving section 55 connected to the output side of a pilot lock switching valve 43, and is switched over in interlock with shifting of the switching valve 43. In a hydraulic drive system including pressure compensating valves controlled by an LS system, an actuator can be locked with a simple construction and can be prevented from malfunctioning in an inoperative condition while an engine is being driven, even when the system includes a mechanically shifted directional control valve, or even when a mechanically shifted directional control valve is retrofitted to the system.

公开(公告)号：US06408622B1

公开(公告)日：2002-06-25

申请号：US09622957

申请日：2000-08-24

申请人： Yasutaka Tsuruga ,  Takashi Kanai ,  Junya Kawamoto ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

发明人： Yasutaka Tsuruga ,  Takashi Kanai ,  Junya Kawamoto ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

IPC分类号： F15B1306

CPC分类号： E02F9/2225 ,  E02F9/2207 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/0406 ,  F15B11/162 ,  F15B11/165 ,  F15B2211/20553 ,  F15B2211/20584 ,  F15B2211/255 ,  F15B2211/30505 ,  F15B2211/30535 ,  F15B2211/3111 ,  F15B2211/3144 ,  F15B2211/31576 ,  F15B2211/50527 ,  F15B2211/5153 ,  F15B2211/6054 ,  F15B2211/63 ,  F15B2211/6313 ,  F15B2211/6316 ,  F15B2211/7135

摘要： A hydraulic drive system having a swing control system, includes a pump control unit for controlling a pump delivery rate such that a pump delivery pressure is held a predetermined value higher than a maximum load pressure among a plurality of actuators. Pressure compensating valves are each constructed to set, as a target compensation differential pressure, a differential pressure between a delivery pressure of a hydraulic pump and a maximum load pressure among the actuators. A pressure compensating valve for a swing section is given such a load dependent characteristic that when the load pressure rises, the target compensation differential pressure is reduced, the load dependent characteristic being set so as to provide a flow rate characteristic simulating constant-horsepower control of a swing motor.

摘要翻译： 具有摆动控制系统的液压驱动系统包括：泵控制单元，用于控制泵输送速率，使得泵输送压力保持在多个致动器中比最大负载压力高的预定值。 压力补偿阀各自被构造成将作为目标补偿压差的液压泵的输送压力和致动器中的最大负载压力之间的压力设定为压力补偿阀。 用于摆动部分的压力补偿阀具有这样的负载依赖特性：当负载压力升高时，目标补偿压差降低，负载相关特性被设定为提供模拟恒功率控制的流量特性 摆动马达

公开(公告)号：US06584770B2

公开(公告)日：2003-07-01

申请号：US09936283

申请日：2001-09-12

申请人： Yasutaka Tsuruga ,  Takashi Kanai ,  Junya Kawamoto ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

发明人： Yasutaka Tsuruga ,  Takashi Kanai ,  Junya Kawamoto ,  Satoshi Hamamoto ,  Yasuharu Okazaki ,  Yukiaki Nagao

IPC分类号： F16D3102

CPC分类号： E02F9/226 ,  E02F9/2203 ,  E02F9/2232 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/163 ,  F15B2211/20553 ,  F15B2211/253 ,  F15B2211/30505 ,  F15B2211/30535 ,  F15B2211/3111 ,  F15B2211/351 ,  F15B2211/6054 ,  F15B2211/651 ,  F15B2211/71 ,  F15B2211/75

摘要： In a hydraulic drive system in which a target compensated differential pressure for each of pressure compensating valves 21a, 21b is set in accordance with a differential pressure between a pump delivery pressure and a maximum load pressure, and a target LS differential pressure is set as a variable value depending on a revolution speed of an engine 1, a fixed throttle 32 and a signal pressure variable relief valve 33 are disposed in a maximum load pressure line 35. A relief setting pressure PLMAXO of the signal pressure variable relief valve 33 is set so as to satisfy PLMAXO=PR−PGR+a (where a is a value smaller than PGR) with respect to a target LS differential pressure PGR and a setting pressure PR of the main relief valve 30.

摘要翻译： 在液压驱动系统中，根据泵输送压力和最大负载压力之间的压差设定压力补偿阀21a，21b中的每一个的目标补偿压差，并将目标LS压差设定为 可变值取决于发动机1的转速，固定节流阀32和信号压力可变溢流阀33设置在最大负载压力线35中。信号压力可变溢流阀33的释放设定压力PLMAXO设定为 满足相对于目标LS差压PGR和主溢流阀30的设定压力PR的PLMAXO = PR-PGR + a（其中a为小于PGR的值）。