-
公开(公告)号：US09903097B2
公开(公告)日：2018-02-27
申请号：US14536776
申请日：2014-11-10
发明人： Hirofumi Hashimoto
CPC分类号： E02F9/2228 , E02F9/2267 , E02F9/2282 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/02 , F15B11/16 , F15B13/0402 , F15B2211/20576 , F15B2211/30525 , F15B2211/30565 , F15B2211/3116 , F15B2211/31582 , F15B2211/41554 , F15B2211/45 , F15B2211/7135 , F15B2211/7142 , F15B2211/78 , F15B2211/781
摘要： A hydraulic circuit for a construction machine including a direction control valve group including direction control valves provided in tandem to a center bypass passage, and a bleed-off valve provided to the center bypass passage downstream of the direction control valve group.
-
公开(公告)号：US09863448B2
公开(公告)日：2018-01-09
申请号：US14443444
申请日：2013-11-19
发明人： Koji Ueda
CPC分类号： F15B11/08 , E02F9/2217 , E02F9/2225 , E02F9/2239 , E02F9/2282 , E02F9/2292 , F15B2211/205 , F15B2211/20576 , F15B2211/212 , F15B2211/255 , F15B2211/30525 , F15B2211/31558 , F15B2211/4159 , F15B2211/45 , F15B2211/46 , F15B2211/5156 , F15B2211/555 , F15B2211/611 , F15B2211/62 , F15B2211/7053 , F15B2211/8609 , F15B2211/88
摘要： A hydraulic circuit for a construction machine, capable of enhancing the effect of reducing a pressure loss due to return oil from a head-side chamber of a hydraulic cylinder, with a simple structure. The circuit includes a hydraulic cylinder, a control valve, a return pipeline, and a tank direct-communication line providing direct communication between the control valve and a tank separately from the return pipeline. The control valve has a flow path leading return oil from a head-side chamber of the hydraulic cylinder to the tank direct-communication line and a flow path leading return oil from a rod-side chamber of the hydraulic cylinder to the return pipeline.
-
公开(公告)号：US20180002897A1
公开(公告)日：2018-01-04
申请号：US15686369
申请日：2017-08-25
发明人： Hirofumi HASHIMOTO
CPC分类号： E02F9/2228 , E02F9/2267 , E02F9/2282 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/02 , F15B11/16 , F15B13/0402 , F15B2211/20576 , F15B2211/30525 , F15B2211/30565 , F15B2211/3116 , F15B2211/31582 , F15B2211/41554 , F15B2211/45 , F15B2211/7135 , F15B2211/7142 , F15B2211/78 , F15B2211/781
摘要： A direction control valve group for a construction machine that controls an amount of pressure oil supplied to a hydraulic actuator from a hydraulic pump that discharges the pressure oil is provided. The direction control valve includes a cylinder port that supplies the pressure oil to the hydraulic actuator, a bridge passage that is switchably connected and disconnected to the cylinder port according to a change in position of a first spool, and an internal passage that supplies the pressure oil discharged from the hydraulic pump to the bridge passage. The first spool is provided in the internal passage.
-
公开(公告)号：US09845814B2
公开(公告)日：2017-12-19
申请号：US14411265
申请日：2013-09-25
申请人： KOMATSU LTD.
发明人： Teruo Akiyama , Noboru Iida , Koji Saito , Takayuki Watanabe , Kenji Sasano
IPC分类号： F15B11/042 , F15B11/044 , F15B11/08 , E02F9/22
CPC分类号： F15B11/0445 , E02F9/2225 , E02F9/2228 , E02F9/2235 , E02F9/2282 , E02F9/2289 , E02F9/2292 , E02F9/2296 , F15B11/0423 , F15B11/08 , F15B2211/20561 , F15B2211/27 , F15B2211/7053 , F15B2211/761 , F15B2211/785
摘要： A hydraulic fluid flowpath includes a first flowpath and a second flowpath. The first flowpath connects a first pump port and a first chamber in a hydraulic cylinder. The second flowpath connects a second pump port and a second chamber in the hydraulic cylinder. The hydraulic fluid flowpath forms a closed circuit between a hydraulic pump and the hydraulic cylinder. A bleed-off flowpath bleeds off a portion of the hydraulic fluid from the second flowpath. A control valve connects the second flowpath to the bleed-off flowpath via a throttle when an operation amount of an operating member for lowering a work implement is less than a predetermined operation amount so that a hydraulic pressure in second flowpath is maintained at less than a relief pressure. The predetermined operation amount is less than or equal to the maximum operation amount for lowering the work implement.
-
公开(公告)号：US09725885B2
公开(公告)日：2017-08-08
申请号：US14765767
申请日：2013-02-06
发明人： Yang-Gu Lee
CPC分类号： E02F9/2292 , E02F9/123 , E02F9/2029 , E02F9/2242 , E02F9/2267 , E02F9/2282 , E02F9/2296 , F15B11/17 , F15B2211/20576 , F15B2211/30595 , F15B2211/7058 , F15B2211/7142
摘要： Disclosed is a hydraulic construction machinery capable of operating a travel apparatus and a swing apparatus, when same are to be operated in combination, by means of working fluids supplied at the maximum discharge flow rate from a plurality of hydraulic pumps. A hydraulic construction machinery according to the present invention comprises: first and second hydraulic pumps; travel and swing motors connected to the first hydraulic pump; a hydraulic actuator connected to the second hydraulic pump; a main control valve comprising a first control valve and a second control valve, the first control valve controlling a working fluid supplied from the first hydraulic pump to the travel and swing motors, and the second control valve controlling the working fluid supplied from the second hydraulic pump to the hydraulic actuator; a first regulating valve, disposed on the most upstream side of a supply channel of the second hydraulic pump, for switching when the travel and swing motors are operated simultaneously so that the working fluid of the first hydraulic pump is supplied to the travel motor and the working fluid of the second hydraulic pump is supplied to the swing motor; a second regulating valve, disposed on the most downstream side of a supply channel of the second hydraulic pump, for switching when the travel and swing motors are operated simultaneously so as to close the most downstream opening of the supply channel of the second hydraulic pump; and an electronic proportional valve for outputting a control signal, corresponding to a control signal from a controller, to the first and second regulating valves when a manipulation signal, sensing whether the travel and swing motors are manipulated, is entered in the controller.
-
公开(公告)号：US09725884B2
公开(公告)日：2017-08-08
申请号：US14525322
申请日：2014-10-28
发明人： Hirofumi Hashimoto
CPC分类号： E02F9/2282 , E02F9/2242 , E02F9/2267 , E02F9/2292 , F15B11/16 , F15B11/17 , F15B2211/20546 , F15B2211/20576 , F15B2211/30595 , F15B2211/31517 , F15B2211/327 , F15B2211/41554 , F15B2211/45 , F15B2211/6346 , F15B2211/6652 , F15B2211/6654 , F15B2211/7142
摘要： A hydraulic circuit of a construction machine including center bypass passages, into which a pressurized oil from hydraulic pumps is supplied, includes a directional control valve group in tandem with the center bypass passages; a bleed-off valve on a downstream side of each center bypass passage; and a merging circuit that merges the pressurized oil supplied into one center bypass passage and that in another center bypass passage, wherein each directional control valve includes a first internal passage that flows the pressurized oil into the center bypass passages, and a second internal passage that supplies the pressurized oil to a hydraulic actuator, wherein the center bypass passages and the first internal passage form a parallel passage, wherein an opening area of the bleed-off valve is changed, wherein the merging circuit includes a merging directional control valve that controls an inflow direction of the pressurized oil to be merged.
-
公开(公告)号：US20170175782A1
公开(公告)日：2017-06-22
申请号：US15422152
申请日：2017-02-01
发明人： Shinya IMURA , Hidetoshi SATAKE , Kouji ISHIKAWA , Seiji HIJIKATA , Takatoshi OOKI , Shinji NISHIKAWA
CPC分类号： F15B13/06 , E02F9/123 , E02F9/2095 , E02F9/2217 , E02F9/2235 , E02F9/2242 , E02F9/2282 , E02F9/2292 , E02F9/2296 , F15B11/20 , F15B21/001 , F15B21/14 , F15B2211/20546 , F15B2211/20569 , F15B2211/20576 , F15B2211/7053 , F15B2211/7058 , F15B2211/88
摘要： The Construction machinery includes at least two actuators, a main pump that generates hydraulic energy for driving the actuators, control valves disposed between the main pump and the actuators, a hydraulic pump motor driven by the generator motor that generates energy to be added to the hydraulic energy, and a controller that reduces hydraulic energy generated by the main pump when the hydraulic pump motor driven by the generator-motor generates energy. The construction machinery further comprises changeover valves that selectively change a location at which the energy from the hydraulic pump motor driven by the generator-motor is to be added according to the actuators. The controller changes a reduction rate of the hydraulic energy generated by the main pump depending on a specific actuator to which the energy is to be added.
-
公开(公告)号：US09657654B2
公开(公告)日：2017-05-23
申请号：US14779341
申请日：2014-03-13
发明人： Masahiro Kayane , Katsuaki Kodaka , Yuuta Nakamura
CPC分类号： F02D29/04 , E02F9/2246 , E02F9/2282 , E02F9/2285 , E02F9/2296 , F02D31/001 , F02D41/021 , F15B11/04 , F15B13/0401 , F15B21/082 , F15B2211/20523 , F15B2211/20546 , F15B2211/30 , F15B2211/45 , F15B2211/6309 , F15B2211/6316 , F15B2211/633 , F15B2211/6651 , F15B2211/85
摘要： The present invention is to reduce the flow rate of pressure oil discharged from a main pump and returned to a tank when specific work is executed with an operation amount of an operating device being made small in the state in which an engine is kept at an idling speed. According to the present invention, there is provided a main controller (20) which is capable of controlling the speed of an engine (11) to a normal work speed at which a work implement such as a boom (4) can perform normal work and which controls the speed of the engine (11) to an idling speed serving as a speed lower than the normal work speed when an operating device has returned from an operating position to a neutral position. Configuration is made such that the main controller (20) performs a control process for bringing the speed of the engine (11) to a specific work speed serving as a speed higher than the idling speed but lower than the normal work speed, on detecting execution of the specific work which is performed with an operation amount of the operating device such as a boom operating device (16) being kept small in a state in which the speed of the engine (11) is kept at the idling speed.
-
公开(公告)号：US09651063B2
公开(公告)日：2017-05-16
申请号：US14349452
申请日：2011-10-07
申请人： Hea-Gyoon Joung , Young-Bog Song
发明人： Hea-Gyoon Joung , Young-Bog Song
CPC分类号： F15B13/021 , E02F9/2037 , E02F9/2225 , E02F9/2228 , E02F9/2282 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F02D29/04 , F15B11/16 , F15B2211/20546 , F15B2211/3116
摘要： Disclosed is a lower track for mounting rubber pads on a track shoe to be attachable and detachable after assembling a steel plate which is adhered with divisionally formed rubber pads as a single unit without additionally perforating coupling through-holes in the track shoe when the rubber pad which forms the lower track and the track shoe which is formed of a metal material are coupled. The lower track of a crawler excavator according to the present invention comprises: first and second rubber pads which are divisionally formed; a first steel plate which supports the bottom surface of the first rubber pad by surrounding the same, and has first hooks formed on the bottom surface thereof and coupling holes formed in a connection stepped-portion.
-
公开(公告)号：US20170022687A1
公开(公告)日：2017-01-26
申请号：US15116385
申请日：2015-02-05
申请人： NABTESCO CORPORATION
发明人： Hitoshi IWASAKI
CPC分类号： E02F9/2282 , E02F3/42 , E02F9/0883 , E02F9/2292 , E02F9/2296 , F15B1/26 , F15B11/17 , F15B13/06 , F15B2211/20546 , F15B2211/20576 , F15B2211/305 , F15B2211/31582 , F15B2211/45 , F15B2211/7051
摘要： Cost for a direction switching valve (third direction switching valve) is reduced while oil is supplied from two pumps to one actuator (third actuator).A hydraulic circuit 30 for construction machinery includes a first unloading passage 31 connected with a first pump 11, a second unloading passage 32 connected with a second pump 12, a first supply passage 41 connected with the first pump 11, a second supply passage 42 connected with the second pump 12, a third supply passage 43, and third direction switching valves (53E and 53F). The third supply passage 43 is connected with the first supply passage 41 and the second supply passage 42. The third direction switching valves are connected with the third supply passage 43, the first unloading passage 31, the second unloading passage 32, and the tank passage 35, and supply and discharge oil to and from the third actuators (23E and 23F).
摘要翻译： 用于工程机械的液压回路30包括与第一泵11连接的第一卸载通道31，与第二泵12连接的第二卸载通道32，与第一泵11连接的第一供应通道41， 第二泵12，第三供应通道43和第三方向切换阀（53E和53F）。 第三供给通道43与第一供应通道41和第二供应通道42连接。第三方向切换阀与第三供应通道43，第一卸载通道31，第二卸载通道32和油箱通道 35，并且向第三致动器（23E和23F）供应和排出油。
-
-
-
-
-
-
-
-
-
搜索结果
418 条记录 (耗时 0.035 秒)
