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公开(公告)号：US20230112211A1
公开(公告)日：2023-04-13
申请号：US18079628
申请日：2022-12-12
申请人： KUBOTA CORPORATION
发明人： Hiroshi HORII
摘要： A working machine includes a machine body, a first hydraulic actuator mounted on the machine body, a first control valve that controls the first hydraulic actuator, a controller that controls the first control valve, and a second hydraulic actuator that is different from the first hydraulic actuator. When the second hydraulic actuator and the first hydraulic actuator are operated in combination, the controller reduces the amount of change in the flow rate of a hydraulic fluid supplied from the first control valve to the first hydraulic actuator with respect to changes in a manipulation amount to operate the first hydraulic actuator to a value smaller than that when the first hydraulic actuator is solely operated.
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公开(公告)号：US11460052B2
公开(公告)日：2022-10-04
申请号：US16774201
申请日：2020-01-28
IPC分类号： B60G21/067 , F15B13/02 , E01C23/088 , E01C23/06 , F15B13/06 , F15B15/20
摘要： A hydraulic system for controlling a hydraulic circuit of a working machine is disclosed. The hydraulic system can include a first hydraulic cylinder assembly, a second hydraulic cylinder assembly, a third hydraulic cylinder assembly and a valve. When coupled to the first hydraulic cylinder assembly and the second hydraulic cylinder assembly, the third hydraulic cylinder assembly can be configured to control a flow of a hydraulic fluid between the first hydraulic cylinder assembly and the second hydraulic cylinder assembly to limit an extent of travel of the first piston and an extent of travel of the second piston.
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公开(公告)号：US20220170241A1
公开(公告)日：2022-06-02
申请号：US17437154
申请日：2020-06-11
发明人： Shohei KAWASUMI
IPC分类号： E02F9/22 , F15B13/04 , F15B13/042 , F15B13/06 , F16K1/36 , F16K11/07 , F16K31/383
摘要： A main valve throttle (53) of a main valve (43) is configured by a lateral hole (53A) communicating an inlet side flow passage (25) and an outlet side flow passage (27) through the inside of the main valve (43) and a groove portion (53C) communicating the inlet side flow passage (25) and the outlet side flow passage (27) via an outer peripheral portion of the main valve (43). The groove portion (53C) is located such that a hydraulic fluid spurting from the groove portion (53C) changes the direction of a flow of a hydraulic fluid spurting from the lateral hole (53A). In this case, the direction of a flow of a hydraulic fluid F2 spurting from the lateral hole (53A) can be changed to approach the direction parallel to the center axis of the main valve (43) by a hydraulic fluid F1 spurting from the groove portion (53C).
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公开(公告)号：US11286962B2
公开(公告)日：2022-03-29
申请号：US16650263
申请日：2017-09-29
发明人： Jinwook Kim
IPC分类号： F15B13/04 , F15B11/16 , F15B13/02 , F15B13/043 , F15B13/06
摘要： A flow control valve includes a valve body having an inner circumferential surface defining a longitudinal bore to which first and second fluid passages are connected. A spool is slidably inserted into the bore to allow a flow of fluid from the first to second fluid passage. A valve regulates a flow rate of fluid flowing through the first fluid passage. A first seat surface is defined between an area in which the first fluid passage is connected to the bore and an area in which the second fluid passage is connected to the bore. When the flow of fluid from the first to second fluid passage is initiated, an area of a gap between the first seat surface and the spool on a plane taken in a transverse direction is 5%˜50%, preferably 10%˜20% of an area of an opening defined by the first seat surface.
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公开(公告)号：US11149759B2
公开(公告)日：2021-10-19
申请号：US16522292
申请日：2019-07-25
发明人： Charles Young , Jason R. Coombs
摘要： Disclosed embodiments include hydraulic systems which provide power to lift, tilt and auxiliary (e.g., implement) functions, including high-flow auxiliary functions, with increased efficiency. Disclosed embodiments incorporate a single variable displacement pump that supplies pressurized fluid to a main control valve (e.g., for lift, tilt, and auxiliary functions) and a bypass circuit. The main control valve supplies fluid to control lift, tilt, and auxiliary flow for implements. The bypass circuit combines flow with the output of the auxiliary section of the main control valve to optionally provide high-flow for selected implements. The single variable displacement pump can then be set to different output flow levels, with the bypass circuit functioning differently under different conditions to optimize hydraulic flow to carryout various tasks under various conditions.
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公开(公告)号：US11041514B2
公开(公告)日：2021-06-22
申请号：US15910504
申请日：2018-03-02
申请人： WALVOIL S.P.A.
发明人： Amedeo Morotto , Davide Mesturini
摘要： A distributor (3) of the closed-center, load sensing type, connected to a variable displacement pump (1) comprises a valve device (10, 110), composed of a logic element, which is pilot-operated and configured to bring a high-pressure channel (2) into communication with a low-pressure channel (4), the connection being usually opened by the combined action of an equivalent pressure generated by an elastic member (12) and a counter-pressure which is generated, under operative conditions, in the low-pressure channel (4). The connection is closed in a switching position and it is pilot-operated to a closure position by the combined action of a high-pressure signal (P) and a load sensing signal (LS).
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公开(公告)号：US20210002864A1
公开(公告)日：2021-01-07
申请号：US17027834
申请日：2020-09-22
发明人： Nicholas N. WHITE , James HOWLAND , Hao ZHANG , Blake CARL
摘要： A hydraulic system for recovering potential energy of a load implement of a mobile construction vehicle. The hydraulic system includes first and second actuators and control valving. The first and second actuators are configured to be coupled to the load implement for controlling raising and lowering of the load element. The control valving is operable between a first position at which, during a lowering of the load implement, the control valving directs hydraulic fluid from one of the first and second actuators to an accumulator to charge the accumulator, and a second position at which the control valving directs hydraulic fluid from the accumulator to one or more of the first and second actuators to power the one or more of the first and second actuators to raise the load element.
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公开(公告)号：US10578132B2
公开(公告)日：2020-03-03
申请号：US15552538
申请日：2015-09-14
申请人： KYB Corporation
IPC分类号： F15B13/02 , F15B11/028 , F15B11/16 , F15B13/06
摘要： A fluid pressure control device includes a switching valve that has a pilot chamber to which the working oil is supplied from the supply passage through the second control valve, and a first relief valve that is provided on the downstream side of the switching valve. The second control valve allows supply of the working oil to the pilot chamber in a case where a flow of the working oil to a tilt cylinder is allowed, and blocks the supply of the working oil to the pilot chamber in a case where the flow of the working oil to the tilt cylinder is blocked. The switching valve allows a flow of the working oil to the first relief valve in a case where the working oil is supplied to the pilot chamber, and blocks the flow of the working oil to the first relief valve in a case where the supply of the working oil to the pilot chamber is blocked.
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公开(公告)号：US10526767B2
公开(公告)日：2020-01-07
申请号：US15556103
申请日：2015-09-29
发明人： Seiji Hijikata , Kouji Ishikawa , Shinya Imura
摘要： Provided is a construction machine allowing regeneration of a return hydraulic fluid at the time of both a boom raising operation and a boom lowering operation with a small number of valves, making it possible to secure a satisfactory operability at the time of both the boom raising operation and the boom lowering operation.The construction machine includes: a first hydraulic actuator; a second hydraulic actuator; a tank; and a first hydraulic pump supplying a hydraulic fluid to the second hydraulic actuator, the construction machine further including: a return hydraulic fluid selection device selecting a supply source of a return hydraulic fluid generated at a time of a raising operation or a lowering operation of the first hydraulic actuator and discharging the return hydraulic fluid; a regeneration line supplying the hydraulic fluid discharged from the return hydraulic fluid selection device to a portion between the second hydraulic actuator and the first hydraulic pump to regenerate the hydraulic fluid; a discharge line discharging the hydraulic fluid discharged from the return hydraulic fluid selection device to the tank; and a regeneration/discharge flow rate adjustment device capable of adjusting a flow rate of the hydraulic fluid flowing through the regeneration line and a flow rate of the hydraulic fluid flowing through the discharge line.
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公开(公告)号：US10385980B2
公开(公告)日：2019-08-20
申请号：US15202650
申请日：2016-07-06
申请人： ROSS EUROPA GmbH
发明人： Johannes Hartwig , An Vu Van
IPC分类号： F16K11/07 , F16K31/122 , F15B11/12 , F16K27/00 , F15B13/042 , F15B13/06 , F15B13/08 , F15B13/04
摘要： A valve assembly includes a first spool valve that directs fluid to a working object. The first spool valve has 5 ports. A second spool valve directs fluid to the exhaust. The second spool valve has 5 ports. The valve assembly has only 4 positions. The valve assembly can direct the working air through different ports to allow for different working objects to be actuated.
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