公开(公告)号：US06226987B1

公开(公告)日：2001-05-08

申请号：US09218493

申请日：1998-12-22

申请人： Seita Hayashi ,  Hideki Kado ,  Sadao Nunotani

发明人： Seita Hayashi ,  Hideki Kado ,  Sadao Nunotani

IPC分类号： F16D3102

CPC分类号： F16H61/475 ,  F16D31/02 ,  F16H61/4148 ,  F16H61/4157 ,  F16H61/4183 ,  F16H61/42 ,  F16H61/433

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。

公开(公告)号：US6112521A

公开(公告)日：2000-09-05

申请号：US194334

申请日：1998-11-24

申请人： Seita Hayashi ,  Sadao Nunotani ,  Hideki Kado

发明人： Seita Hayashi ,  Sadao Nunotani ,  Hideki Kado

IPC分类号： E02F9/12 ,  E02F9/22 ,  F15B11/044 ,  F16H61/40 ,  F16H61/4061 ,  F16D31/02 ,  F15B11/08

CPC分类号： F16H61/4061 ,  E02F9/128 ,  E02F9/2253 ,  E02F9/226 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/0445 ,  F16H61/40 ,  F16H61/4052 ,  F16H61/4069 ,  F16H61/4148 ,  F16H61/4157 ,  F16H61/4183 ,  F15B2211/20546 ,  F15B2211/30525 ,  F15B2211/329 ,  F15B2211/50518 ,  F15B2211/50527 ,  F15B2211/5156 ,  F15B2211/528 ,  F15B2211/555 ,  F15B2211/6051 ,  F15B2211/6058 ,  F15B2211/6355 ,  F15B2211/6653 ,  F15B2211/7058 ,  F15B2211/8609

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。

公开(公告)号：US5826488A

公开(公告)日：1998-10-27

申请号：US817812

申请日：1997-04-14

申请人： Mitsuru Arai ,  Hideki Kado ,  Sadao Nunotani ,  Koichi Morita ,  Mitsuru Oshiro ,  Seita Hayashi

发明人： Mitsuru Arai ,  Hideki Kado ,  Sadao Nunotani ,  Koichi Morita ,  Mitsuru Oshiro ,  Seita Hayashi

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。

公开(公告)号：US06915631B2

公开(公告)日：2005-07-12

申请号：US10611967

申请日：2003-07-03

申请人： Hideki Kado ,  Yuuichi Yamamoto

发明人： Hideki Kado ,  Yuuichi Yamamoto

IPC分类号： F15B11/02 ,  F15B11/00 ,  F16H59/06 ,  F16H59/42 ,  F16H61/40 ,  F16H61/4183 ,  F16H61/42 ,  F16H61/431 ,  F16H61/439 ,  F16D1/00

CPC分类号： F16H61/438 ,  F16H61/421 ,  F16H61/431

摘要： A forward/backward switching control apparatus for a hydraulic drive vehicle that includes the following structures. A variable displacement type hydraulic pump driven by an engine for discharging pressure oil in both directions. An electromagnetic pump inclination angle control mechanism making the discharge displacement of the variable displacement type hydraulic pump variable and for causing the same to discharge in both directions. An electric control outputting signals to run the hydraulic drive vehicle forward, backward and forward/backward. A control device outputting, when the electric control is switched forward/backward to output the forward/backward signal and when the time for switching the forward/backward signal is not longer than a preset time, a first modulate signal for delaying the return times from the forward position to the neutral position and from the backward position to the neutral position to the electromagnetic pump inclination angle control mechanism.

摘要翻译： 一种用于液压驱动车辆的前进/后退切换控制装置，其包括以下结构。 一种由两个方向排出压力油的发动机驱动的可变排量型液压泵。 一种电磁泵倾斜角度控制机构，使可变排量型液压泵的排放位移变化并使其在两个方向上排放。 输出信号的电气控制器，用于向前，向后和向前/向后运行液压驱动车辆。 一种控制装置，当电气控制正向/反向切换以输出正向/反向信号时，以及当切换前向/后向信号的时间不长于预设时间时，输出用于将返回时间延迟的第一调制信号 向前位置到中立位置，从后退位置到中立位置到电磁泵倾斜角度控制机构。

公开(公告)号：US06209675B1

公开(公告)日：2001-04-03

申请号：US09228570

申请日：1999-01-11

申请人： Seita Hayashi ,  Hideki Kado ,  Sadao Nunotani

发明人： Seita Hayashi ,  Hideki Kado ,  Sadao Nunotani

IPC分类号： B60K1710

CPC分类号： F16H61/42 ,  F16H59/22 ,  F16H61/4017 ,  F16H61/4061 ,  F16H61/4148 ,  F16H2059/366

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。

公开(公告)号：US06068013A

公开(公告)日：2000-05-30

申请号：US817414

申请日：1997-04-16

申请人： Mitsuru Arai ,  Seita Hayashi ,  Sadao Nunotani ,  Hideki Kado

发明人： Mitsuru Arai ,  Seita Hayashi ,  Sadao Nunotani ,  Hideki Kado

IPC分类号： E02F9/22 ,  F15B11/00 ,  F15B11/044 ,  F15B13/02 ,  F15B13/04 ,  F16K17/04

CPC分类号： E02F9/2267 ,  E02F9/2271 ,  F15B11/00 ,  F15B11/044 ,  F15B11/0445 ,  F15B13/021 ,  F15B13/0402 ,  F15B2211/30505 ,  F15B2211/30525 ,  F15B2211/50581 ,  F15B2211/853 ,  Y10T137/2554 ,  Y10T137/2562

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。

公开(公告)号：US5884984A

公开(公告)日：1999-03-23

申请号：US849595

申请日：1997-05-28

申请人： Mitsuru Arai ,  Seita Hayashi ,  Hideki Kado ,  Sadao Nunotani ,  Mitsuru Oshiro

发明人： Mitsuru Arai ,  Seita Hayashi ,  Hideki Kado ,  Sadao Nunotani ,  Mitsuru Oshiro

IPC分类号： E02F9/22 ,  E02F9/12 ,  F15B11/00 ,  F15B11/02

CPC分类号： F16H61/4148 ,  E02F9/123 ,  E02F9/128 ,  F15B11/02 ,  F16H61/4157 ,  F16H61/423 ,  F16H61/4061

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。