-
公开(公告)号：US20240425104A1
公开(公告)日：2024-12-26
申请号：US18822691
申请日：2024-09-03
Applicant: Parker-Hannifin Corporation
Inventor： Hao Zhang , Raymond Collett , Rajneesh Kumar , Qiang Wang , Miao Zhang , James Howland
Abstract: A hydraulic system for a work machine comprising a priority circuit including at least a first priority actuator and a priority control valve for controlling the supply of hydraulic fluid to the first priority actuator and for providing a load sense signal indicative of the load acting on the first priority actuator; an auxiliary circuit including at least a first auxiliary actuator and at least a first auxiliary control valve for controlling the supply of hydraulic fluid to the first auxiliary actuator; at least a first pump for producing a flow of hydraulic fluid; and a priority valve for distributing the flow from the pump to the priority circuit and auxiliary circuit for operating the respective actuators thereof, with priority being given to the priority circuit as a function of the load sense signal.
-
公开(公告)号：US12173731B2
公开(公告)日：2024-12-24
申请号：US18562958
申请日：2022-08-03
Applicant: Komatsu Ltd.
Inventor： Satoshi Ishikawa , Junichi Fukushima , Keita Murakami , Masateru Hachisuka
Abstract: In a pressure compensation valve, a spool portion of a valve body is provided with a throttle passage that constantly communicates with a pump port. A case is provided with supply pressure communication passages to block space between the throttle passage and a load pressure chamber when a poppet portion closes space between the pump port and a cylinder port by biasing force of a load pressure spring, and that, meanwhile, communicate between the throttle passage and the load pressure chamber via a throttle hole when the spool portion moves in an opening direction by a predetermined stroke. A lead-out pressure chamber that presses the poppet portion in a closing direction in a case where an internal pressure increases is provided between the poppet portion and the case, and a lead-out pressure passage that constantly communicates with the cylinder port is connected to the lead-out pressure chamber.
-
公开(公告)号：US12168857B2
公开(公告)日：2024-12-17
申请号：US18275890
申请日：2022-02-28
Applicant: Komatsu Ltd.
Inventor： Wataru Sumino , Shinobu Nagura , Yuuki Yokoyama , Masatoshi Ikeda
Abstract: An excavator includes: a swing motor driven by oil from a swing pump coupled to a power take-off and driven by an engine; a first main oil passage connecting a first discharge port of the swing pump and a first suction port of the swing motor; a second main oil passage connecting a second discharge port of the swing pump and a second suction port of the swing motor; a neutral retention valve disposed in the first main oil passage and the second main oil passage and controlling passage of oil; a regenerative energy absorbing device coupled to the power take-off and absorbs regenerative energy generated by oil from the swing motor to the swing pump via a meter-out opening of the neutral retention valve; and a valve control section controlling an area of the meter-out opening based on a state of the regenerative energy absorbing device.
-
公开(公告)号：US12140162B2
公开(公告)日：2024-11-12
申请号：US17608815
申请日：2019-05-30
Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
Inventor： Minheuk Kang
Abstract: A spool valve is provided. A valve housing has a pilot fluid passage, and a first portion and a second portion lengthwisely spaced apart from each other. A spool is movably inserted in the valve housing, and includes a plug able to enter the pilot fluid passage between the first portion and the second portion to change a flow area of the pilot fluid passage following movement of the spool. A hydraulic machine provides that when pilot fluid is supplied to the pilot fluid passage through the first portion, at least a portion of the supplied pilot fluid is provided to the holding valve through the second portion. The holding valve allows a flow of working fluid from the first chamber to the spool valve, and the spool moves to a third position to forward working fluid to the second chamber.
-
公开(公告)号：US20240352951A1
公开(公告)日：2024-10-24
申请号：US18682369
申请日：2022-08-05
Applicant: HD HYUNDAI INFRACORE CO., LTD.
Inventor： Myeongku YEO
CPC classification number: F15B13/06 , F15B13/025 , F15B2211/45
Abstract: A hydraulic system according to an embodiment of the present invention comprises: a main hydraulic pump for discharging a hydraulic fluid; a plurality of driving apparatuses operating by receiving the hydraulic fluid; a parallel flow path through which the hydraulic fluid discharged by the main hydraulic pump flows; a plurality of control spools respectively connected to the parallel flow path in parallel to control the supply of hydraulic fluid to the plurality of driving apparatuses; and a plurality of electronic proportional decompression valves for adjusting a pilot pressure, applied to the respective control spools to be proportional to a current signal which has been input, wherein, if the plurality of control spools do not operate, the hydraulic fluid discharged by the main hydraulic pump is drained into an oil tank via the parallel flow path without passing through the plurality of control spools.
-
Patent Agency Ranking
公开(公告)号：US12109765B2
公开(公告)日：2024-10-08
申请号：US17914360
申请日：2020-10-29
Applicant: JIANGSU YANGLI HYDRAULIC EQUIPMENT CO., LTD.
Inventor： Guilin Luo , Lihui Qiao
CPC classification number: B29C70/42 , B30B1/34 , B30B15/0052 , B30B15/045 , B30B15/163 , B30B15/166 , B30B15/186 , F15B1/26 , F15B13/02 , F15B2211/40576
Abstract: A hydraulic press includes a workbench having four corners provided with uprights. The uprights are arranged in two rows front and rear, and the tops of the uprights in each row are connected by an upper beam extending in a left-right direction. Tie rods are inserted in the front and rear of each upright. The tie rods each have an upper end protruding from the top of the upper beam and fixed to the upper beam by an upper nut and a lower end protruding from the bottom of the workbench and fixed to the workbench by a lower nut. A central cylinder is provided at the center of the upper beam. Side cylinders are symmetrically arranged on the left and right of the central cylinder. The lower ends of plungers of the central cylinder and the side cylinders are fixedly connected to a top of a slider.
-
公开(公告)号：US20240326217A1
公开(公告)日：2024-10-03
申请号：US18130038
申请日：2023-04-03
Applicant: Caterpillar Inc.
Inventor： Cody MOORE
CPC classification number: B25D17/06 , E02F3/966 , E02F9/2217 , E02F9/2225 , F15B1/04 , F15B11/08 , F15B13/027 , F15B15/00 , B25D2217/0023 , E02F9/2285
Abstract: A piston for a hydraulic hammer of a work machine is disclosed. The piston comprises a first portion having a first diameter, a second portion having a second diameter larger than the first diameter, the second portion having a plurality of grooves, and a third portion having a third diameter less than the second diameter.
-
公开(公告)号：US12098515B2
公开(公告)日：2024-09-24
申请号：US17618954
申请日：2020-06-30
Applicant: KOMATSU LTD.
Inventor： Tomoki Konda , Takeshi Oi , Kenjiro Shimada , Kenji Ohiwa
CPC classification number: E02F3/435 , E02F3/32 , E02F3/425 , E02F9/2203 , E02F9/2228 , E02F9/2246 , E02F9/2267 , E02F9/26 , F15B13/024 , F15B19/00 , E02F9/2285
Abstract: A work machine comprises: a work implement; a hydraulic cylinder; a hydraulic pump that supplies the hydraulic oil to the hydraulic cylinder via a hydraulic circuit; a relief valve that can set a relief pressure of the hydraulic circuit to either a first set pressure or a second set pressure higher than the first set pressure; a detection unit that detects at least one of a pressure of the hydraulic oil in the hydraulic circuit and a speed of the work implement; and a relief pressure changing unit that changes a relief pressure of the relief valve from the first set pressure to the second set pressure based on a detection value of at least one of the pressure of the hydraulic oil in the hydraulic circuit and the speed of the work implement when the controlled state of the work implement is the excavation state.
-
公开(公告)号：US12098060B1
公开(公告)日：2024-09-24
申请号：US18614420
申请日：2024-03-22
Applicant: Roadtek Enterprises Inc.
Inventor： Dustin Nielson , Maggie Hu
CPC classification number: B66F3/42 , F15B13/024 , F15B2211/30505 , F15B2211/50518 , F15B2211/55 , Y10T137/87185
Abstract: Hydraulic jack assemblies are disclosed herein. The hydraulic jack assemblies may include a hydraulic unit base that includes a plurality of pump pistons to output hydraulic fluids with different characteristics that can be selectively used based on load conditions. The hydraulic jack assemblies may additionally or alternatively include a hydraulic fluid release valve that may be opened by an electrically powered driver.
-
公开(公告)号：US20240287949A1
公开(公告)日：2024-08-29
申请号：US18175120
申请日：2023-02-27
Applicant: Woodward, Inc.
Inventor： Jeffrey Michael Brandt
CPC classification number: F02K1/763 , F15B1/265 , F15B13/027 , F15B13/06 , F15B15/2815
Abstract: The subject matter of this specification can be embodied in, among other things, an engine assembly having a nacelle partially surrounding an engine, and a thrust reverser having a first element movable relative to the nacelle between a stowed and deployed position, a first hydraulic actuator configured to move the first element between the stowed and deployed position, the first hydraulic actuator being connected to a fluid source and a return reservoir, and a second element movable between a stowed and deployed position, a second hydraulic actuator configured to move the second element between the stowed and deployed position, the second hydraulic actuator being connected to the fluid source and the return reservoir, and a fluid control system having a servo valve operable to selectively route fluid between the fluid source, the first hydraulic actuator, and the return reservoir, and a controller configured to operate the servo valve.
-
-
-
-
-
-
-
-
-
Search Results
1902
records
(took 0.025 seconds)
