Swash plate angle changing apparatus for a piston pump/motor of swash
plate type
    1.
    发明授权
    Swash plate angle changing apparatus for a piston pump/motor of swash plate type 失效
    用于斜盘式活塞泵/马达的斜盘角度更换装置

    公开(公告)号:US5826488A

    公开(公告)日:1998-10-27

    申请号:US817812

    申请日:1997-04-14

    IPC分类号: F04B1/20 F01B3/00 F04B1/22

    CPC分类号: F04B1/2085 Y10T74/18336

    摘要: In a piston pump/motor of swash plate type which comprises: a cylinder block disposed in a casing to be rotatable jointly with a shaft therein; a plurality of pistons slidably inserted in the cylinder block parallel to the shaft; and a swash plate swingably attached to the casing for guiding the plurality of pistons on a front surface thereof and changing a displacement of each of the pistons by changing an inclination thereof, there is provided a swash plate angle changing apparatus in which the swash plate has a rear surface formed with a first contact surface and a second contact surface which make an angle between them. The casing has a swash plate support surface which is perpendicular to the shaft and with which the first contact surface and the second contact surface are each adapted to contact. The casing has a swash plate angle changing piston; the swash plate is swung by a force resultant from thrust forces of the pistons in the direction of the swash plate to a first position whereby the first contact surface makes contact with the swash plate support surface to yield a large angle of the said swash plate and also is swung by a thrust force of the swash plate angle changing piston to a position whereby the second contact surface makes contact with the swash plate support surface to yield a small angle of the swash plate; and the said swash plate has a center of swing located closer to the front surface than the rear surface of the swash plate.

    摘要翻译: PCT No.PCT / JP95 / 02136 Sec。 371日期1997年04月14日 102(e)日期1997年4月14日PCT 1995年10月18日PCT PCT。 公开号WO96 / 12107 PCT 日期:1996年04月25日在旋转斜盘式活塞泵/电动机中,包括:气缸体,其设置在壳体内以与其中的轴一起旋转; 多个活塞,其与所述轴平行地可滑动地插入所述气缸体中; 以及可旋转地附接到壳体的斜盘,用于在其前表面上引导多个活塞,并且通过改变其倾斜来改变每个活塞的位移,设置有斜盘角度改变装置,其中斜盘具有 后表面形成有第一接触表面和在它们之间形成角度的第二接触表面。 壳体具有垂直于轴的斜盘支撑表面,第一接触表面和第二接触表面通过该表面适于接触。 外壳具有斜盘角度更换活塞; 旋转斜盘由从活塞的推力在旋转斜盘的方向上产生的力摆动到第一位置,由此第一接触表面与斜板支撑表面接触以产生所述斜盘的大角度,并且 还通过斜板角度变化活塞的推力摆动到第二接触表面与斜盘支撑表面接触以产生斜盘的小角度的位置; 并且所述斜盘具有比旋转斜盘的后表面更靠近前表面的摆动中心。

    Travel drive apparatus for hydraulic drive work vehicles and control therefor
    2.
    发明授权
    Travel drive apparatus for hydraulic drive work vehicles and control therefor 失效
    液压驱动作业车辆行驶驱动装置及其控制

    公开(公告)号:US06226987B1

    公开(公告)日:2001-05-08

    申请号:US09218493

    申请日:1998-12-22

    IPC分类号: F16D3102

    摘要: A travel drive apparatus for a hydraulic drive work vehicle of simple configuration, capable of preventing occurrence of cavitation which is predicted when a work vehicle is decelerated, descends a slope, or is changed from forward travel to reverse travel or from reverse travel to forward travel, and a control method thereof. The travel drive apparatus for a hydraulic drive work vehicle includes a travel variable delivery hydraulic pump driven by power from an engine, a hydraulic motor that receives oil discharged from the travel variable delivery hydraulic pump and moves the vehicle at or below a prescribed speed, a travel changeover valve that receives the discharged oil from the travel variable delivery hydraulic pump, supplies the discharged oil to the hydraulic motor and discharges return oil from the hydraulic motor to a tank, in which a horsepower control mechanism is provided that is linked to the travel variable delivery hydraulic pump, that is operated by receiving pressure for driving the hydraulic motor at one end thereof and a signal responsive to a turning speed of the engine at the other end thereof, and that outputs a command to discharge a certain quantity of oil so that the pressure for driving the hydraulic motor reaches or exceeds a prescribed value, when the engine turning speed is at or below a prescribed value and the hydraulic motor is driven conversely from the vehicle.

    摘要翻译: 一种简单结构的液压驱动作业车辆的行驶驱动装置,能够防止作业车辆减速时预测的气蚀的发生,坡度下降,或从前进行驶向后行驶或从倒车行驶向前行驶 以及其控制方法。液压驱动作业车辆的行驶驱动装置包括由发动机的动力驱动的行驶可变输送液压泵,接收从行驶式输出液压泵排出的油并将车辆移动到 或低于规定速度,从行驶输出液压泵接收排出的油的行驶切换阀将排出的油供给到液压马达,并将来自液压马达的返回油排出到马达控制机构为 只要与通过接收压力f操作的行程变量输送液压泵相连 或者在其一端驱动液压马达和响应于其另一端的发动机的转速的信号,并输出一定量的排出一定量的油的指令,使得用于驱动液压马达的压力达到或超过 当发动机转速等于或低于规定值并且液压马达与车辆相反地驱动时,规定值。

    Backpressure control circuit for hydraulic drive device
    3.
    发明授权
    Backpressure control circuit for hydraulic drive device 失效
    液压驱动装置背压控制电路

    公开(公告)号:US6112521A

    公开(公告)日:2000-09-05

    申请号:US194334

    申请日:1998-11-24

    摘要: The present invention relates to a backpressure control circuit for a hydraulic drive device, which reduces the loss in drive power and which can suppress cavitation. Thus, the backpressure control circuit for hydraulic drive devices is a hydraulic drive circuit: for supplying to a hydraulic motor pressurized oil discharged from a hydraulic pump through a direction changeover valve, which is switched upon receipt of a pilot pressure; and for permitting at the time of braking by the hydraulic motor, a throttle valve to throttle return oil from the hydraulic motor and oil discharged from the hydraulic pump to generate a backpressure to supply pressurized oil to the hydraulic motor via a check valve for prevention of cavitation. The backpressure control circuit includes a pilot valve (60) for taking a pressure on a drive side of the hydraulic motor (24) as a pilot pressure upon receipt of a signal from an operating lever (39), and a variable throttle valve (80) for changing a backpressure to a low pressure or to a high pressure upon receipt of a pilot pressure from the pilot valve (60).

    摘要翻译: PCT No.PCT / JP97 / 01734 Sec。 371日期:1998年11月24日 102(e)1998年11月24日PCT PCT 1997年5月23日PCT公布。 第WO97 / 45659号公报 日期1997年12月4日本发明涉及一种用于液压驱动装置的背压控制电路,其减少驱动功率的损失并且可以抑制空化。 因此,用于液压驱动装置的背压控制电路是液压驱动电路,用于向通过方向切换阀从液压泵排出的压力油供给液压驱动电路,该方向切换阀在接收到先导压力时被切换; 并且为了在液压马达制动时允许节流阀来节流来自液压马达的回油和从液压泵排出的油产生背压,以通过止回阀向液压马达提供加压油,以防止 气蚀。 背压控制电路包括:先导阀(60),其在接收到来自操作杆(39)的信号时,作为先导压力,在液压马达(24)的驱动侧上施加压力,以及可变节流阀(80) ),用于在从先导阀(60)接收到先导压力时将背压改变为低压或高压。

    Travel drive apparatus for hydraulic drive work vehicle and control method therefor
    4.
    发明授权
    Travel drive apparatus for hydraulic drive work vehicle and control method therefor 失效
    液压驱动工作车辆行驶驱动装置及其控制方法

    公开(公告)号:US06209675B1

    公开(公告)日:2001-04-03

    申请号:US09228570

    申请日:1999-01-11

    IPC分类号: B60K1710

    摘要: A travel drive apparatus for a hydraulic drive work vehicle and control method therefor, the apparatus including: a travel hydraulic pump driven by the power of an engine; a hydraulic motor that receives discharged oil from the travel hydraulic pump and causes the vehicle to travel; a travel changeover valve that receives the discharged oil from the travel hydraulic pump, supplies the discharged oil to the hydraulic motor and discharges return oil from the hydraulic motor to a tank, in which the travel drive apparatus comprises; an accelerator for controlling an engine rotational speed; an operation unit for selecting vehicle forward travel, stop, and reverse travel; the travel changeover valve being adapted for receiving signals from the operation unit, switching the discharge oil supplied from the travel hydraulic pump to the hydraulic motor, and controlling vehicle forward travel, stop and reverse travel; a relief valve that regulates pressure for controlling the hydraulic motor when the vehicle has decelerated, positioned between the travel changeover valve and the hydraulic motor; and a pressurizing unit for raising the set pressure at the relief valve controlling the hydraulic motor when the engine rotational speed is increased, while switching the vehicle from forward travel to reverse travel, or from reverse travel to forward travel, so that the work vehicle may switch over from forward to reverse travel; or vice versa, while exhibiting good acceleration performance.

    摘要翻译: 一种用于液压驱动作业车辆的行驶驱动装置及其控制方法,该装置包括:由发动机的动力驱动的行驶液压泵; 液压马达,其从所述行驶液压泵接收排出的油,并使所述车辆行驶; 从行驶液压泵接收排出的油的行驶切换阀,将排出的油供给到液压马达,并将返回油从液压马达排出到行驶驱动装置所具备的油箱; 用于控制发动机转速的加速器; 用于选择车辆前进行驶,停止和反向行驶的操作单元; 所述行驶切换阀适于从所述操作单元接收信号,将从所述行驶液压泵供给的排出油切换到所述液压马达,并且控制车辆前进行驶,停止和反向行驶; 安全阀,其在车辆减速时调节用于控制液压马达的压力,位于行程切换阀和液压马达之间; 以及加压单元,用于当发动机转速增加时提高控制液压马达的安全阀的设定压力,同时将车辆从前进行驶切换到反向行驶,或者从倒车行驶到前进行驶,使得作业车辆 从前进到倒车行驶切换; 反之亦然,同时表现出良好的加速性能。

    Counter balance valve
    5.
    发明授权
    Counter balance valve 失效
    平衡阀

    公开(公告)号:US06068013A

    公开(公告)日:2000-05-30

    申请号:US817414

    申请日:1997-04-16

    摘要: In a counter balance valve, a valve body is provided with a valve bore having first and second pump-side ports, first and second motor-side ports and an auxiliary port. A spool is slidably fitted in the valve bore in a longitudinal direction thereof to establish and block communication between the respective ports. Left and right springs maintain the spool at a neutral position in which the respective ports are closed. A left pressure receiving chamber shifts the spool by a pressure oil supplied therein to a first travelling position at which the first pump-side port and the auxiliary port are communicated with each other and the second pump-side port and the second motor-side port are also communicated with each other. A right pressure receiving chamber shifts the spool by a pressure oil supplied therein to a second travelling position at which the second pump-side port and the auxiliary port are communicated with each other and the first pump-side port and the first motor-side port are communicated with each other. The spool is formed with a first axial bore communicated with the left pressure receiving chamber, a second axial bore communicated with the right pressure receiving chamber, first and second small diameter bores communicating the first and second axial bores with the first and second pump-side ports, respectively, and first and second large diameter bores communicating the first and second axial bores with an outer peripheral surface of the spool.

    摘要翻译: PCT No.PCT / JP95 / 02135 Sec。 371日期1997年04月16日 102(e)日期1997年4月16日PCT提交1995年10月18日PCT公布。 出版物WO96 / 日期1996年4月25日在平衡阀中,阀体设置有具有第一和第二泵侧端口,第一和第二电动机侧端口和辅助端口的阀孔。 阀芯沿其纵向方向可滑动地装配在阀孔中,以建立和阻止各个端口之间的连通。 左右弹簧将阀芯保持在相应端口关闭的中间位置。 左压力容纳室通过其中供应的压力油将阀芯移动到第一行进位置,第一泵侧端口和辅助端口彼此连通,第二泵侧端口和第二电动机侧端口 也互相沟通。 右压力接收室通过其中供应的压力油将阀芯移动到第二泵侧端口和辅助端口彼此连通的第二行进位置以及第一泵侧端口和第一电动机侧端口 相互通信。 阀芯形成有与左压力接收室连通的第一轴向孔,与右压力接收室连通的第二轴向孔,使第一和第二轴向孔与第一和第二泵侧连通的第一和第二小直径孔 端口,以及第一和第二大直径孔,其将第一和第二轴向孔与管芯的外周表面连通。

    Hydraulic braking apparatus having two safety valves
    6.
    发明授权
    Hydraulic braking apparatus having two safety valves 失效
    具有两个安全阀的液压制动装置

    公开(公告)号:US5884984A

    公开(公告)日:1999-03-23

    申请号:US849595

    申请日:1997-05-28

    摘要: There is provided a hydraulic braking apparatus, characterized in that it comprises: a first safety valve for draining a high pressure fluid at the side of a second port of a hydraulic motor into the side of a first port thereof; a second safety valve for draining a high pressure fluid at the side of the said first port of the said hydraulic motor into the side of the said second port thereof; and a braking valve adapted to be switched from a neutral position to a first position or a second position under a difference in pressure between the said first port and the said second port, the inlet side of each of the said first safety valve and the said second safety valve having a communication via the said braking valve with the side of each of the said first port and the said second port, and having an increased area of such communication when the said braking valve is set in the said neutral position and a reduced area of such communication when the braking valve is switched to the said first position or to the said second position.

    摘要翻译: PCT No.PCT / JP95 / 02557 Sec。 371日期1997年5月28日 102(e)日期1997年5月28日PCT提交1995年12月13日PCT公布。 第WO96 / 18824号公报 日本1996年6月20日提供了一种液压制动装置,其特征在于,包括:第一安全阀,用于将液压马达的第二端口侧的高压流体排出到其第一端口侧; 第二安全阀,用于将所述液压马达的所述第一端口侧的高压流体排放到所述第二端口的侧面; 以及适于在所述第一端口和所述第二端口之间的压力差处于中间位置切换到第一位置或第二位置的制动阀,所述第一安全阀和所述第二端口中的每一个的入口侧 所述第二安全阀具有经由所述制动阀与所述第一端口和所述第二端口中的每一个的侧面的连通,并且当所述制动阀设置在所述中立位置时具有增加的所述连通的面积,并且减小 当制动阀切换到所述第一位置或所述第二位置时这种通信的区域。

    Driving device for a hydraulic motor
    7.
    发明授权
    Driving device for a hydraulic motor 失效
    液压马达驱动装置

    公开(公告)号:US5930997A

    公开(公告)日:1999-08-03

    申请号:US913717

    申请日:1997-12-03

    摘要: A hydraulic motor driving apparatus includes a directional control valve for supplying discharge pressure fluid from a hydraulic pump into a first or second port of a hydraulic motor and returning the hydraulic fluid from the second or first port into a tank, and a pilot pressure applying valve for controlling the directional control valve. The directional control valve is urged to its neutral position by springs, to its first position by hydraulic pressure against its first pressure receiving portion and to its second position by hydraulic pressure against its second pressure receiving portion. Discharge pressure fluid from the hydraulic pump is supplied via a check valve into the first and second ports of the hydraulic motor when the directional control valve is at the neutral position. The discharge pressure fluid is supplied into the first port of the hydraulic motor and a hydraulic pressure fluid of the second port flows into the tank, when the directional control valve is at the first position. The discharge pressure fluid is supplied into the second port of the hydraulic motor and hydraulic pressure fluid of the first port flows into the tank, when the directional control valve is at the second position. The pilot pressure applying valve is urged to its neutral position by springs and switched to its first or second position by a first or second drive unit, to apply pilot pressure to the first or second pressure receiving portion of the directional control valve.

    摘要翻译: PCT No.PCT / JP96 / 00764 Sec。 371日期1997年12月3日第 102(e)日期1997年12月3日PCT 1996年3月22日PCT公布。 WO96 / 30651 PCT出版物 日期1996年10月3日液压马达驱动装置包括用于将来自液压泵的排出压力流体供给到液压马达的第一或第二端口并将液压流体从第二或第一端口返回到罐中的方向控制阀,以及 用于控制方向控制阀的先导压力施加阀。 方向控制阀通过弹簧被推到其中间位置,通过相对于其第一压力接收部分的液压被压到其第一位置,并且通过相对于其第二压力接收部分的液压被压向其第二位置。 当方向控制阀处于中立位置时,来自液压泵的排出压力流体通过止回阀供应到液压马达的第一和第二端口中。 当方向控制阀处于第一位置时,排出压力流体被供应到液压马达的第一端口中,并且第二端口的液压流体流入箱体。 当方向控制阀处于第二位置时,排出压力流体被供应到液压马达的第二端口中,并且第一端口的液压流体流入罐中。 先导压力施加阀通过弹簧被推到其中立位置,并通过第一或第二驱动单元转换到其第一或第二位置,以将先导压力施加到方向控制阀的第一或第二受压部分。

    Capacity control device for a hydraulic motor for a hydraulically driven
vehicle
    8.
    发明授权
    Capacity control device for a hydraulic motor for a hydraulically driven vehicle 失效
    用于液压驱动车辆的液压马达的容量控制装置

    公开(公告)号:US5907952A

    公开(公告)日:1999-06-01

    申请号:US952385

    申请日:1997-11-17

    摘要: There is disclosed an apparatus for controlling the capacity of a hydraulic motor (5) in a hydraulically driven motor vehicle, which comprises: a hydraulic pump (2) adapted to be driven by an engine (1) having a variable rotation speed; the hydraulic motor of a variable capacity type adapted to be rotated by a discharge pressure fluid from the hydraulic motor for driving a traveling body that constitutes the motor vehicle allowed to travel; a capacity control section for reducing the capacity of the hydraulic motor when the rotation speed of the engine is increased and for increasing the capacity of the hydraulic motor when the rotation speed of the engine is reduced, the capacity control section having a variable operation rate and being operable at a variety of positions among a maximum capacity position, an intermediate capacity position and a minimum capacity position; and an operation rate control unit for accelerating the operation rate of the capacity control section when it is operating at a position between the maximum capacity position and the intermediate capacity position mentioned above and for decelerating the above mentioned operation rate when the capacity control section is operating at a position between the intermediate capacity position and the minimum capacity position mentioned above.

    摘要翻译: PCT No.PCT / JP96 / 01375 Sec。 371日期:1997年11月17日 102(e)日期1997年11月17日PCT 1996年5月23日PCT公布。 WO96 / 37718 PCT公开号 日本公开1996年11月28日公开了一种用于控制液压驱动机动车辆中的液压马达(5)的容量的装置,其包括:液压泵(2),其适于由具有变量 旋转速度; 可变容量型的液压马达,适于由用于驱动构成允许行驶的机动车辆的行驶体的液压马达的排出压力流体旋转; 容量控制部,其用于在发动机的转速增加时降低液压马达的容量,并且在发动机的转速减小时增加液压马达的容量,所述容量控制部具有可变的运转率, 可在最大容量位置,中间容量位置和最小容量位置之间的各种位置操作; 以及操作速度控制单元,用于当容量控制部分在上述最大容量位置和中间容量位置之间的位置运行时加速容量控制部分的操作速率,并且当容量控制部分操作时减速上述操作速率 在中间容量位置和上述最小容量位置之间的位置。

    Hydraulic circuit for hydraulically driven working vehicle
    9.
    发明授权
    Hydraulic circuit for hydraulically driven working vehicle 失效
    液压驱动工作车液压回路

    公开(公告)号:US5946910A

    公开(公告)日:1999-09-07

    申请号:US952267

    申请日:1997-11-14

    IPC分类号: E02F9/22 F16D31/02

    CPC分类号: E02F9/2225

    摘要: The present invention relates to a hydraulic circuit for a hydraulically driven working vehicle which allows the vehicle to travel at an almost constant speed during high-speed traveling, provides a great digging force during working, does not need a charging pressure for preventing cavitation, loses a small amount of energy, and has a simple structure. To this end, the hydraulic circuit has a hydraulic travel pump (2) and a working machine hydraulic pump (4) which are driven by the power of an engine (1) for discharging pressurized oil to a HST travel circuit and a working machine-driving hydraulic circuit, respectively, wherein pressurized oil from the working machine hydraulic pump (4) joins pressurized oil from the hydraulic travel pump (2) to effect high-speed traveling, while pressurized oil from the hydraulic travel pump (2) joins pressurized oil in the working machine hydraulic pump (4) to generate a large digging force to effect digging.

    摘要翻译: PCT No.PCT / JP96 / 01282 Sec。 371日期:1997年11月14日 102(e)1997年11月14日日期PCT提交1996年5月15日PCT公布。 公开号WO96 / 36776 日期:1996年11月21日本发明涉及一种用于液压驱动作业车辆的液压回路,其允许车辆在高速行驶期间以几乎恒定的速度行驶,在加工期间提供了很大的挖掘力,不需要充气压力 用于防止空化,失去少量能量,结构简单。 为此,液压回路具有由用于将加压油排放到HST行驶回路的发动机(1)的动力驱动的液压行程泵(2)和作业机械液压泵(4) 驱动液压回路,其中来自工作机械液压泵(4)的加压油从液压行程泵(2)接合加压油以实现高速行驶,而来自液压行程泵(2)的压力油连接加压油 在工作机械液压泵(4)中产生大的挖掘力来挖掘。

    Hydraulic pilot valve
    10.
    发明授权
    Hydraulic pilot valve 失效
    液压先导阀

    公开(公告)号:US5558127A

    公开(公告)日:1996-09-24

    申请号:US416699

    申请日:1995-04-10

    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 (23, 24) 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 limiting a maximum control input of an operating lever is fixed to the operating levers (23, 24), so that an operating force during a maximum operation of an operating lever is received by the stopper member. Furthermore, in the hydraulic pilot valve, an erroneous operation due to vibrations and the like is prevented by a damper mechanism (50) interposed between a lever fixed to each of the operating levers (23, 24) and a main body (1) of the valve. 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.

    摘要翻译: PCT No.PCT / JP92 / 01318 Sec。 371日期:1995年4月10日 102(e)日期1995年4月10日PCT提交1992年10月9日PCT公布。 出版物WO94 / 09278 日期1994年04月28日一种由一对减压阀构成的液压先导阀,其特征在于,能够自由地调节所述液压先导阀的操作杆(23,24)的最大控制输入的制动器,以产生最大的先导压力输出 从一对减压阀自由调节。 此外,在液压先导阀中,用于限制操作杆的最大控制输入的止动构件被固定到操作杆(23,24),使得操作杆的最大操作期间的操作力被 止动件。 此外,在液压先导阀中,通过夹在固定到每个操作杆(23,24)的杆和主体(1)之间的阻尼机构(50)来防止由振动等引起的错误操作 阀门。 此外,夹在减压阀的输出端口之间的梭阀可以简化用于从输出端口的先导压力中取出最大先导压力的液压先​​导阀的结构。