公开(公告)号：EP0774547A4

公开(公告)日：1997-12-29

申请号：EP95927961

申请日：1995-08-03

申请人： KOMATSU MFG CO LTD

发明人： HORI SHUJI ,  KARAKAMA TADAO

IPC分类号： F16K31/122 ,  E02F9/22 ,  E02F9/24 ,  F15B13/01

CPC分类号： E02F9/2267 ,  E02F9/2221 ,  E02F9/226 ,  E02F9/2271 ,  E02F9/2285 ,  F15B13/015 ,  Y10T137/87241

摘要： A valve apparatus for preventing a fall of a working machine comprises a cylinder-side passage (20) communicating with a cylinder port (19) opened in a cylinder-side mounting surface (11), a valve body (10) having a directional control valve-side passage (18) communicating with a directional control valve port (17), a check valve (24) provided in the valve body (10) and preventing the entry of a pressure oil from the cylinder-side passage (20) into the directional control valve-side passage (18), a flow rate control valve (34) provided in the valve body (10), normally shutting off the directional control valve-side passage (18) and cylinder-side passage (20) from each other, and establishing communication between these passages on receiving an external signal, and a safety valve (44) provided in the valve body (10) and adapted to relieve a high pressure in the cylinder-side passage (20). The check valve (24), flow rate control valve (34) and safety valve (44) are provided in a common plane substantially parallel to the cylinder-side mounting surface (11).

公开(公告)号：EP0791753A4

公开(公告)日：2000-01-26

申请号：EP95939408

申请日：1995-12-08

申请人： KOMATSU MFG CO LTD

发明人： MARUYAMA JUN ,  HORI SHUJI ,  KAWABATA KEI ,  ENDO HIROSHI

IPC分类号： E02F9/12 ,  E02F9/22 ,  F15B11/044 ,  F15B11/00

CPC分类号： E02F9/128 ,  E02F9/123 ,  E02F9/2207 ,  E02F9/226 ,  F15B11/0445 ,  F15B2211/20538 ,  F15B2211/324 ,  F15B2211/50518 ,  F15B2211/50527 ,  F15B2211/7058

摘要： A device for preventing the reversal of a hydraulic actuator comprising a hydraulic actuator for driving an inertia body, a main valve that can be changed over between a driving state in which pressure oil is supplied to one of first and second ports of the hydraulic actuator with the other of the two ports being caused to communicate with a tank and a neutral state in which the first and second ports are cut off, a safety valve for allowing pressure oil to flow from either of the first and second ports to the tank when the pressure of either of the first and second port sides exceeds a pre-set high pressure, a suction valve for sucking oil into either of the first and second ports when the pressure of either of the first and second port sides becomes negative, and a reversal prevention valve for causing the first and second port sides to communicate with the tank respectively when the pressures on the first and second port sides are higher than a certain pre-set pressure which is lower than the pre-set high pressure.

摘要翻译： 一种用于防止液压致动器的反转的装置，其包括用于驱动惯性体的液压致动器，主阀，其能够在其中向液压致动器的第一和第二端口中的一个供应压力油的驱动状态之间切换， 使两个端口中的另一个与罐和中断状态进行通信，其中第一和第二端口被切断;安全阀，用于当压力油从第一和第二端口中的任一个流到罐时 第一和第二端口中的任一侧的压力超过预设的高压;吸入阀，用于当第一和第二端口侧中的任一侧的压力变为负时将油吸入第一和第二端口中的任一个，并且反向 防止阀，用于当第一和第二端口侧的压力高于一定的预设压力时，使第一和第二端口分别与罐连通 r比预设高压。

公开(公告)号：EP0775832A4

公开(公告)日：1998-02-25

申请号：EP94913432

申请日：1992-10-09

申请人： KOMATSU MFG CO LTD

发明人： MARUYAMA JUN SEITA ,  HAYASHI SEITA ,  HORI SHUJI ,  KARAKAMA TADAO

IPC分类号： E02F9/22 ,  F15B13/042 ,  F15B13/14 ,  F16K11/16 ,  F16K31/44 ,  F16K35/00

CPC分类号： F15B13/0422 ,  E02F9/2267 ,  E02F9/2271 ,  E02F9/2285 ,  F15B13/14 ,  Y10T137/87064 ,  Y10T137/87233

摘要： A hydraulic pilot valve consisting of a pair of pressure-reducing valves, wherein a stopper which can freely adjust maximum control inputs of operating levers of the hydraulic pilot valve is provided to make maximum pilot pressures output from the pair of pressure-reducing valves freely adjustable. Furthermore, in the hydraulic pilot valve, a stopper member for regulating a maximum control input of an operating lever is fixed to an operating lever, so that an operating force during a maximum operation of an operating lever is received by a member fixed to the operating lever. Furthermore, in the hydraulic pilot valve, an erroneous operation due to vibrations and the like are prevented by a damper mechanism interposed between a lever and a main body of the valve and fixed to an operating lever. Furthermore, a shuttle valve interposed between the output ports of the pressure-reducing valves can simplify the construction of the hydraulic pilot valve for taking out a maximum pilot pressure out of the pilot pressures of the output ports.