公开(公告)号：US11181194B2

公开(公告)日：2021-11-23

申请号：US16760800

申请日：2019-09-12

申请人： KYB Corporation

发明人： Keita Matsuzaka ,  Kenji Suzuki

IPC分类号： F16H61/4104 ,  F15B21/0423 ,  F15B11/08

摘要： A fluid pressure drive device includes a flushing circuit configured to discharge a working fluid from one of the pair of main passages to a tank. The flushing circuit has a low pressure selection valve provided between the pair of main passages and configured to be switched by a pressure difference between the pair of main passages, the low pressure selection valve being configured to select the main passage on the low pressure side; and a flushing passage configured to lead the working fluid passing through the low pressure selection valve to the tank. The flushing passage has a first orifice and a bent portion formed on the downstream side of the first orifice.

公开(公告)号：US20190360583A1

公开(公告)日：2019-11-28

申请号：US16422623

申请日：2019-05-24

申请人： Robert Bosch GmbH

发明人： Thomas Froehlich ,  Markus Gepraegs ,  Patrick Weidele

IPC分类号： F16H61/4104 ,  F16H61/44 ,  F16K11/044

摘要： A hydraulic flushing valve arrangement includes a flushing valve having a housing, flushing piston, and at least one spring. The housing includes a valve bore, two circular housing control edges, two inlet channels fluidically connected to the bore, and an outlet channel opening into the bore between the inlet channels. The piston includes two control collars, a piston neck, and piston control edges that delimit the collars from the neck, and that have circular shapes with a recess. The recess has a portion that, in a cross-sectional plane perpendicular to an axis of the piston, is constant and sized such that a flushing quantity is reduced when the portion of the recess is situated in a region of a corresponding housing control edge relative to a quantity when the piston is in an end position. The collars guide the piston so as to be longitudinally displaceable in the bore, and are spaced apart by the neck. The piston and control edges are configured to control the fluidic connections between the bore, the inlet channels, and the outlet channel. The spring preloads the piston in a middle position whereat the outlet channel is blocked from the inlet channels. The piston is configured to move out of the middle position in response to a specific difference between pressures of the two inlet channels. The control collars are respectively configured to open the fluidic connection between a corresponding inlet channel in which a lower pressure prevails and the outlet channel. Such a flushing valve arrangement is usable in hydrostatic travel drives in which two hydromachines are operated in a closed hydraulic circuit.

公开(公告)号：US10406914B2

公开(公告)日：2019-09-10

申请号：US15557743

申请日：2016-03-10

申请人： POCLAIN HYDRAULICS INDUSTRIE

发明人： Ante Bozic ,  Bastien Clapit ,  Julien Lambey

IPC分类号： F16D31/02 ,  B60K17/10 ,  F16H61/4104 ,  F16H61/4139 ,  B60K17/356 ,  B60K17/354

摘要： The invention relates to a device comprising a first hydraulic apparatus (M1) and a second hydraulic apparatus (M2), the two motors (M1, M2) being connected by a first line (11) and a second line (12) enabling the admission or discharge of the oil in said motors (M1, M2), a booster pump (30), arranged between a tank and a booster line, the booster line communicating with at least one of said lines (11, 12), characterized in that the pump (30) is configured to be able to suck oil into the booster line in order to allow the decompression of said first and second lines (11, 12). The invention also relates to a method for evacuating a device of the type described above, in which the booster pump (30) is activated in suction mode in the booster line to enable the disengagement of the machines (M1, M2).

公开(公告)号：US10119557B2

公开(公告)日：2018-11-06

申请号：US14385628

申请日：2014-05-29

申请人： Komatsu Ltd.

发明人： Takuya Miyata ,  Shinobu Naitou

IPC分类号： F15B13/042 ,  F15B11/08 ,  F15B13/04 ,  F03C1/26 ,  F16H61/4104 ,  F16H61/44 ,  B60K8/00 ,  B66F9/075 ,  E02F9/22 ,  F15B13/00

摘要： A hydraulic driving device includes: a hydraulic motor configured to operate by flushing oil from a hydraulic pump through a high pressure oil passage and a low pressure oil passage; a low pressure selective valve configured to operate in accordance with differential pressure between the high pressure oil passage and the low pressure oil passage, and to discharge the oil in the low pressure oil passage inside a motor case; a tank oil passage configured to connect the inside of the motor case with an oil tank; and a choke throttle provided to the low pressure selective valve or to an oil passage lower than the low pressure selective valve.

公开(公告)号：US4475332A

公开(公告)日：1984-10-09

申请号：US350989

申请日：1982-02-22

申请人： Ronald L. Anderson ,  John R. Harms

发明人： Ronald L. Anderson ,  John R. Harms

IPC分类号： F16H61/40 ,  F16H61/4104 ,  F16H61/42 ,  F16H61/437 ,  F16D31/02

CPC分类号： F16H61/4104 ,  F16H61/40 ,  F16H61/42 ,  F16H61/437

摘要： A closed loop hydrostatic transmission is disclosed which includes an improved hydraulic fluid bleed arrangement. The fluid bleed arrangement includes a variable flow bleed valve hydraulically joined with each of the closed loops of the hydrostatic transmission. Each variable bleed valve is operatively associated with the control mechanism which selectively controls the reversible flow fluid pump of the closed loop for direction of fluid under pressure in forward and reverse directions in the loop. The variable action of each bleed valve permits a relatively greater amount of hydraulic fluid to be bled from the closed loop during periods of operation when the flow of hydraulic fluid otherwise lost from the closed loops is insufficient to permit adequate replenishment of fluid in the loops with cooler charging fluid. Additionally, the variable bleed valves of the system reduce the amount of fluid bled from the loops during periods of operation when a relatively high rate of hydraulic fluid bleed is not desired, thus permitting the charging system of the hydrostatic transmission to include a charging pump of relatively smaller displacement.

摘要翻译： 公开了一种闭环静液压传动装置，其包括改进的液压流体排放装置。 流体排放装置包括与静液压传动装置的每个闭环液压连接的可变流量排放阀。 每个可变泄放阀与控制机构可操作地相关联，该控制机构选择性地控制闭环回流流体泵的循环中在正向和反向压力下的流体的方向。 每个排放阀的可变作用允许相对较大量的液压流体在操作期间从闭合回路中流出，当液体流体从闭合回路中流出的液压流体不足以允许循环中的流体充分补充时， 冷却器充气流体。 此外，当不需要相对高的液压流体流失速率时，该系统的可变放气阀在操作期间减少从循环中流出的流体的量，从而允许静液压传动装置的充气系统包括： 相对较小的位移。

公开(公告)号：US3866421A

公开(公告)日：1975-02-18

申请号：US39710073

申请日：1973-09-13

申请人： BOSCH GMBH ROBERT

发明人： KERSTEN GUNTER ,  FRICKE HANS-JURGEN ,  VEIL KARL

IPC分类号： F16H61/40 ,  F16H61/4104 ,  F16H61/4139 ,  F16H61/4165 ,  F16B21/04

CPC分类号： F16H61/4104 ,  F16H61/4139 ,  F16H61/4165 ,  Y10S60/912

摘要： The high pressure conduit and the low pressure conduit of a hydrostatic transmission are connected by a flushing control valve provided with a discharge outlet into a low pressure area, and by a pressure limiting valve which permits at increased pressure in the high pressure conduit, fluid to flow therethrough so that the fluid flowing ouf of the pressure limiting valve is divided into a first flow part which is discharged by the control valve, and a second flow part entering the low pressure conduit at a point spaced from the point at which a priming pump discharges into the low pressure conduit. In this manner, only part of the hot fluid flows into the pump of the hydrostatic transmission while an other part of the fluid is discharged into a discharge area, and displaced in the low pressure conduit means by cool fluid from the priming pump.

摘要翻译： 静压传动装置的高压导管和低压导管通过设置有排出口的冲洗控制阀连接到低压区域，并通过压力限制阀连接，压力限制阀允许在高压管道中增加压力，流体到 流过其中，使得限流阀的流体流动被分成由控制阀排出的第一流动部分，以及第二流动部分在与起动泵的位置间隔开的点处进入低压管道 排入低压管道。 以这种方式，只有部分热流体流入静液压变速器的泵，同时流体的另一部分被排放到排放区域中，并且通过来自起动泵的冷却流体在低压管道装置中移位。

公开(公告)号：US3748859A

公开(公告)日：1973-07-31

申请号：US3748859D

申请日：1972-02-08

申请人： RENAULT

发明人： PRUVOT F

IPC分类号： F16H39/00 ,  F16H39/02 ,  F16H61/40 ,  F16H61/4104 ,  F16H61/4139

CPC分类号： F16H61/4104 ,  F16H39/00 ,  F16H39/02 ,  F16H61/4139

摘要： A device for refeeding and discharging the hydraulic circuits of a hydrostatic transmission in which the chambers disposed at the ends of a main bore connected to a compensating pump form with said bore two shoulders constituting the seats of refeed and discharge valves comprising each a flange adapted to engage in a fluid-tight manner one of the shoulders, the refeed valves comprising furthermore first and second bores interconnecting the two ends of the valves, the first bore having a greater diameter and opening towards the main bore, each discharge valve being disposed coaxially in the refeed valve and engaging the respective seat.

摘要翻译： 一种用于对静液压传动装置的液压回路重新进行排放的装置，其中设置在与补偿泵连接的主孔的端部处的室形成有构成重新进料和排出阀座的所述孔两个肩部，每个凸缘适于 一个肩部以流体密封的方式进行接触，另外还有第一和第二孔的另外的第一孔和第二孔互相连接在阀的两端，第一孔具有较大的直径和朝向主孔的开口，每个排放阀同轴地设置在 再装上阀门并与相应的座椅接合。

公开(公告)号：US10808838B2

公开(公告)日：2020-10-20

申请号：US16033060

申请日：2018-07-11

申请人： Robert Bosch GmbH

发明人： Markus Gepraegs ,  Stefan Joksch

IPC分类号： F16H61/4104 ,  F16K17/00 ,  F16K17/10 ,  F15B7/00 ,  F15B21/0423 ,  F15B21/00 ,  F15B21/042

摘要： A hydrostatic valve arrangement for flushing pressure medium from a working line of a hydraulic circuit includes a flushing valve with a first flushing connection for connecting to a first working line and an output connection for connecting to a pressure medium sink. The arrangement also includes a pressure valve arranged in a pressure medium flow path of the arrangement from the output connection in the direction of the pressure medium sink. The pressure valve has a valve body on which a force equilibrium is formed. The force equilibrium includes a pressure equivalent that acts on the valve body in a direction that blocks the pressure medium flow path and an opening pressure that acts in a direction that opens the pressure medium flow path and is dependent on the pressure at the output connection. The arrangement further includes an adjusting device for shifting the force equilibrium.

公开(公告)号：US10550933B2

公开(公告)日：2020-02-04

申请号：US15946880

申请日：2018-04-06

申请人： DANFOSS POWER SOLUTIONS INC.

发明人： Christian S. Daley ,  Nicholas Creager ,  Matt Dorenkamp ,  Eric R. Jacobson

IPC分类号： F16H61/4026 ,  F16H61/4052 ,  F16H61/4104 ,  F16H61/4139 ,  F04B49/00

摘要： A hydraulic system that has a hydraulic pump connected to and in communication with a hydraulic motor, at least one hydraulic cylinder, or both by a first conduit and a second conduit (i.e., a high side and a low side). The hydraulic system has a bypass valve connected to and in communication with the first conduit and the second conduit. The bypass valve has a preset pressure that is above a minimum low side pressure. When a shock load occurs in the hydraulic system and a related drop in pressure on the low side occurs, the bypass valve opens when the preset pressure is passed thereby preventing the pressure from dropping to the minimum low side pressure. The hydraulic system thereby avoids a low loop event that could cause damage to the hydraulic system without the presence of larger charge pumps or accumulators.

公开(公告)号：US20180135764A1

公开(公告)日：2018-05-17

申请号：US15577847

申请日：2016-02-25

申请人： Hitachi Construction Machinery Co., Ltd.

发明人： Juri SHIMIZU ,  Teppei SAITOH ,  Kenji HIRAKU ,  Yuki AKIYAMA ,  Hiromasa TAKAHASHI

IPC分类号： F16K11/07 ,  F16H61/4104 ,  F15B11/08

CPC分类号： F16K11/07 ,  E02F9/2289 ,  F15B11/08 ,  F16H61/4104

摘要： A work machine includes a closed circuit system in which there is provided a flushing valve. The flushing valve is equipped with: a valve main body; a spool which can select, in accordance with a position where the spool is arranged in the valve main body, connection between a first flow line and a third flow line, connection between a second flow line and the third flow line, or interruption of the connection between the first flow line, the second flow line, and the third flow line; a first liquid chamber that is provided inside the valve main body and into which a hydraulic working fluid from the first flow line flows; a first piston pressurizing the hydraulic working fluid having flowed into the first liquid chamber and moving the spool to a position where the second flow line and the third flow line are connected together, by the hydraulic pressure of the first liquid chamber; a second liquid chamber that is provided inside the valve main body and into which the hydraulic working fluid from the second flow line flows; and a second piston pressurizing the hydraulic working fluid having flowed into the second liquid chamber and moving the spool to a position where the first flow line and the third flow line are connected together, by the hydraulic pressure of the second liquid chamber.