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公开(公告)号：US5697764A
公开(公告)日：1997-12-16
申请号：US416757
申请日：1995-04-13
Applicant: Yosuke Oda , Kiyoshi Shirai
Inventor： Yosuke Oda , Kiyoshi Shirai
CPC classification number: F04B49/002 , F04B49/08 , F04B2201/1202 , F04B2205/05
Abstract: There is provided a displacement control system for a variable displacement hydraulic pump which has a displacement control piston assembly (6) having a large diameter chamber (7) for operating a displacement control member (5) of the variable displacement hydraulic pump selectively in a direction of smaller displacement and in a direction of larger displacement, first control valve (8) and second control valve (9) for selectively communicating the large diameter chamber of the displacement control piston assembly with a pump discharge line and a tank, the first control valve being placed at a supply position by the pump discharge pressure, and at a drain position by a spring associated with the displacement control piston assembly via a feedback lever, and the second control valve being placed at a first position by the pump discharge pressure for communicating the pump port and the large diameter chamber and at a second position by a load pressure for communicating the pump port and the large diameter chamber and at a second position by a load pressure for communicating the large diameter chamber to the first control valve, the flow path area is varied at the intermediate position of a fluid passage from the large diameter chamber to the pump discharge passage or to a tank. With the construction set forth above, supply speed and drain speed of the pump discharge pressure to and from the large diameter chamber of the displacement control piston assembly is varied by variation of cross-sectional flow area at the intermediate position of the fluid passage. By this, response characteristics in displacement control of the variable displacement hydraulic valve can be adjusted to improve operability of a work implement.
Abstract translation: PCT No.PCT / JP93 / 01577 Sec。 371日期1995年04月13日 102（e）日期1995年4月13日PCT提交1993年10月29日PCT公布。 第WO94 / 10447号公报 日期1994年5月11日提供了一种用于可变排量液压泵的排量控制系统，其具有位移控制活塞组件（6），其具有用于操作可变排量液压泵的位移控制构件（5）的大直径室（7） 选择性地沿较大排量的方向和位移较大的方向选择第一控制阀（8）和第二控制阀（9），用于选择性地将排量控制活塞组件的大直径室与泵排出管线和罐连通， 所述第一控制阀通过泵排出压力被放置在供给位置，并且通过与所述排量控制活塞组件相关联的弹簧经由反馈杆在排放位置处，并且所述第二控制阀被所述泵放置在第一位置 排出压力，用于使泵口和大直径室连通，并在第二位置通过用于连通t的负载压力 通过用于将大直径室连通到第一控制阀的负载压力，泵泵口和大直径室在第二位置处，流路面积在从大直径室到流体通道的流体通道的中间位置处变化 泵排出通道或罐。 通过上述结构，通过位移控制活塞组件的大直径室的泵排出压力的供给速度和排出速度由于流体通道的中间位置处的横截面积面积的变化而变化。 由此，能够调整变量液压阀的排量控制的响应特性，提高作业工具的操作性。
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Patent Agency Ranking2.发明授权
公开(公告)号：US5344288A
公开(公告)日：1994-09-06
申请号：US10392
申请日：1993-01-28
Applicant: Yosuke Oda
Inventor： Yosuke Oda
IPC: F04B49/08
CPC classification number: F04B49/08 , F04B2201/1204 , F04B2205/08
Abstract: A displacement control device of a variable-displacement hydraulic pump which increases the response speed when the pump discharge pressure is low and suppresses increase of the response speed when the pump discharge pressure is high. The displacement control device has a variable-displacement piston 3 which activates a displacement control member 2 of the variable displacement hydraulic pump 1, a circuit 10 which provides a communication between a large-diameter pressure chamber 6 on the variable-displacement piston 3 and an output port 9 of the control valve 7, and a variable restriction valve 11 which is provided in the circuit 10. The restriction valve 11 increases and decreases its opening area when the pump discharge pressure is low and high, respectively. When the pump discharge pressure is low, the pump discharge pressure is smoothly introduced into the large-diameter pressure chamber 6 through the control valve 7, whereas, when the pump discharge pressure is high, the supply of the discharge pressure to the large-diameter pressure chamber is restricted.
Abstract translation: 一种可变排量液压泵的排量控制装置，其在泵排出压力低时增加响应速度，并且当泵排出压力高时抑制响应速度的增加。 位移控制装置具有可变排量活塞3，该可变排量活塞3启动可变排量液压泵1的排量控制构件2，电路10，其提供可变排量活塞3上的大直径压力室6和 控制阀7的输出口9和设置在回路10中的可变限制阀11.限制阀11分别在泵排出压力低且高时增加并减小其开口面积。 当泵排出压力低时，泵排出压力通过控制阀7平稳地引入大直径压力室6，而当泵排出压力高时，排出压力向大直径 压力室受到限制。
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公开(公告)号：US5839885A
公开(公告)日：1998-11-24
申请号：US776526
申请日：1997-02-27
Applicant: Yosuke Oda , Kenji Morino , Naoki Ishizaki
Inventor： Yosuke Oda , Kenji Morino , Naoki Ishizaki
CPC classification number: F04B49/002 , F04B49/08 , F04B2201/1204 , F04B2205/08
Abstract: A capacity control apparatus for a variable capacity hydraulic pump including: a capacity control cylinder having a capacity control piston for driving a capacity control member of the hydraulic pump, with a large diameter chamber and a small diameter chamber disposed at both sides of the capacity control piston, and driving the capacity control piston with a pressure fluid that is supplied into the larger diameter chamber, in a direction in which the capacity of the hydraulic pump may be reduced and for driving the capacity control piston with a pressure fluid that is supplied into the small diameter chamber, in a direction in which the capacity may be increased; a passage for the small diameter chamber to communicate with a pump discharge path; at least one control valve for controlling the capacity of the hydraulic pump by selectively communicating the large diameter chamber with either a pump pressure discharge path and a reservoir; and a variable throttle valve in a passage with the at least one control valve, in which the variable throttle valve is switched into a first state in which a throttled area of aperture in inverse proportion to a self discharge pressure of the pump discharge path is established and into a second state in which a predetermined throttled area of aperture that is independent of the self discharge pressure is established in response to an external signal.
Abstract translation: PCT No.PCT / JP95 / 01839 Sec。 371日期1997年2月27日 102（e）日期1997年2月27日PCT提交1995年9月14日PCT公布。 出版物WO96 / 08652 日本特开1996年3月21日用于变容量液压泵的容量控制装置包括：容量控制缸，具有用于驱动液压泵的容量控制构件的容量控制活塞，具有设置在两者上的大直径室和小直径室 容量控制活塞的侧面，并且利用供给到较大直径室的压力流体沿液压泵的容积减小的方向驱动容量控制活塞，并且以压力驱动容量控制活塞 在容量可以增加的方向上供给到小直径室中的流体; 用于小直径室的通道与泵排出路径连通; 至少一个控制阀，用于通过选择性地将所述大直径室与泵压力排放路径和储存器连通来控制所述液压泵的容量; 以及具有至少一个控制阀的通道中的可变节流阀，其中可变节流阀被切换到第一状态，其中与泵排出路径的自排气压力成反比的开口的节流区域成立 并且进入第二状态，其中响应于外部信号建立独立于自排气压力的预定节流孔径区域。
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公开(公告)号：US5046400A
公开(公告)日：1991-09-10
申请号：US425176
申请日：1989-10-17
Applicant: Tadao Karakama , Naoki Ishizaki , Yosuke Oda
Inventor： Tadao Karakama , Naoki Ishizaki , Yosuke Oda
CPC classification number: F15B13/0842 , E02F9/2267 , F15B13/0807 , F15B13/0892 , F15B13/0896 , F15B2013/006 , Y10T137/87241
Abstract: In a control valve system provided with a plurality of valves for controlling a hydraulic equipment such as hydraulic cylinders, there are employed a plurality of valves each of which does not interfere with each other in operation and requires a minimum mounting space in the system to enable the system to be a small-sized system having a construction easily adapted to control a plurality of hydraulic equipments. The control valve system comprises: a valve (10) assuming a rectangular parallelepiped form; a first (11) and a second (12) pump port passage formed in an upper portion of a valve housing of the valve (10) so as to be parallel to each other; a tank port passage (13) formed in a lower central portion of the valve housing; a first (14) and a second (15) port passage vertically formed in the valve housing so as to separately open into an upper surface of the valve housing to communicate with each of pressure chambers of the hydraulic equipment; and a plurality of valves (19, 20, 23, 24) inserted into a plurality of valve receiving bores formed in the valve housing so as to shut off desired ones of these port passages from the remaining port passages.
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公开(公告)号：US5056415A
公开(公告)日：1991-10-15
申请号：US425163
申请日：1989-10-17
Applicant: Tadao Karakama , Naoki Ishizaki , Yosuke Oda
Inventor： Tadao Karakama , Naoki Ishizaki , Yosuke Oda
CPC classification number: F15B13/0842 , F15B13/0807 , F15B13/0892 , F15B13/0896 , F15B2013/006
Abstract: In a pilot operated control valve system provided with a plurality of valves for controlling a plurality of hydraulic devices such as hydraulic cylinders, there is employed a plurality of valves each of which does not interfere with each other in operation and requires a minimum mounting space in the system to enable the system to be a small system having a construction easily adapted to control a plurality of hydraulic devices and also adapted to simultaneously supply the pressure oil to the hydraulic devices from a pair of hydraulic pumps through the same hydraulic circuit as needs require.
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公开(公告)号：US5040565A
公开(公告)日：1991-08-20
申请号：US425174
申请日：1989-10-17
Applicant: Tadao Karakama , Naoki Ishizaki , Yosuke Oda
Inventor： Tadao Karakama , Naoki Ishizaki , Yosuke Oda
CPC classification number: F15B13/0842 , F15B13/0807 , F15B13/0892 , F15B13/0896 , F15B2013/006 , Y10T137/87201 , Y10T137/87209 , Y10T137/87885
Abstract: In a pilot operated control valve system provided with a plurality of valves for controlling hydraulic equipment such as hydraulic cylinders, there are employed a plurality of valves each of which does not interfere with each other in operation and requires a minimum mounting space in said system to enable said system to be a small-sized system having a construction easily adapted to control a plurality of hydraulic equipments. The control valve system comprises: a valve (10) assuming a rectangular parallelepiped form; a first (11) and a second (12) pump port passage so formed in an upper portion of a valve housing of said valve (10) as to horizontally and parallelly extend to each other and as to communicate with a hydraulic pump; a tank port passage (13) formed in a lower central portion of said valve housing; a pilot tank port passage (25) so formed ina central portion of the valve housing as to communicate with a drain tank; a first (14) and a second (15) port passage vertically formed in said valve housing so as to separately open into an upper surface of said valve housing to communicate with each of pressure chambers of said hydraulic equipment; a plurality of valves (19, 20, 23, 24) inserted into a plurality of valve receiving bores formed in said valve housing so as to shud off desired ones of these port passages from said remaining port passages; and pilot valves for supplying the pilot pressure oil to these valves.
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