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1. 发明授权

US11199260B2 Work vehicle and control method for work vehicle 有权
公开(公告)号：US11199260B2
公开(公告)日：2021-12-14
申请号：US16476685
申请日：2018-05-29
申请人： KOMATSU LTD.
发明人： Takahisa Oasa
IPC分类号： F16H61/431 , F16H61/421 , F16H61/472 , E02F9/22 , F16H59/68
摘要： A work vehicle includes an engine, a hydrostatic transmission, a storage device storing leakage flow rate data defining a relationship between a differential pressure of hydraulic fluid between the first drive circuit and the second drive circuit and a leakage flow rate of the hydraulic fluid in the hydraulic circuit in stalling, and a controller in communication with the storage device. The hydrostatic transmission includes a traveling pump, a hydraulic circuit with first and second drive circuits, and a traveling motor. The controller is configured to determine a target traction force of the work vehicle, determine a target differential pressure that is a target value of the differential pressure from the target traction force, determine the leakage flow rate from the target differential pressure with reference to the leakage flow rate data, and determine a target flow rate of the traveling pump from the leakage flow rate.

2. 发明授权

US10464409B2 Hydraulic hybrid powertrain 有权
公开(公告)号：US10464409B2
公开(公告)日：2019-11-05
申请号：US15308863
申请日：2015-05-11
申请人： DANA ITALIA SPA
发明人： Giulio Ornella , Fabrizio Zendri , Lorenzo Serrao , Ettore Cosoli
IPC分类号： F16H37/02 , F16H3/093 , F16H3/00 , B60K6/12 , B60K25/06 , F16H61/4096 , F16H61/421 , B60K25/02
摘要： A hydraulic hybrid powertrain for a vehicle is disclosed. The powertrain has an internal combustion engine selectively drivingly engaged with an input of a stepped-ratio transmission through a torque converter and through a speed direction changing device. An output of the stepped-ratio transmission is selectively drivingly engaged with a vehicle output. An intermediate gear set is drivingly engaged with the speed direction changing device and drivingly engaged with the input of the stepped-ratio transmission. A hydraulic machine in fluid communication with a hydraulic accumulator assembly, a transmission shaft of the hydraulic machine being drivingly engaged or selectively drivingly engaged with the intermediate gear set for providing energy to the intermediate gear set and for absorbing energy from the intermediate gear set. Also disclosed are methods of operating the hydraulic hybrid powertrain.

3. 发明授权

US10364885B2 Load-dependent regulation of hydraulic motors 有权
公开(公告)号：US10364885B2
公开(公告)日：2019-07-30
申请号：US15098872
申请日：2016-04-14
申请人： Danfoss Power Solutions GmbH & Co. OHG
发明人： Rolf Rathke
IPC分类号： F16H61/44 , F16H61/421 , F16H61/472 , F15B11/16 , F15B13/06 , F16H39/02 , F16H47/02
摘要： Method for the load-dependent regulation of a hydrostatic drive (1), with a closed hydraulic fluid circuit comprising a first hydraulic motor (5) and, parallel to this, a second hydraulic motor (6), whereby both hydraulic motors (5 and 6) are capable of being powered by a hydraulic pump (3) via a high-pressure line (7) and a low-pressure line (8) and are mechanically coupled to each other via a transmission (70). The displacement of the first hydraulic motor (5) can be adjusted proportionally to an electrical signal of an electronic control system (50) by means of an electro-proportional control valve (10) and the displacement of the second hydraulic motor (6) can be adjusted by means of a pressure-proportional control valve (20) which is hydraulically connected to the high-pressure line (7) via a control pressure line (21). The pressure-proportional control valve can be activated by means of a control pressure which is dependent on the high pressure. By means of automatic opening of the pressure-proportional control valve (20) dependent on the high pressure, proportional to the exceedance of a predefinable pressure limit in the high-pressure line (7), the displacement of the second hydraulic motor (6) is adjusted by means of a second servo control unit which can be controlled via the pressure-proportional control valve (20). By means of the electronic control system (50), the actual volume flow passing through the first hydraulic motor (5) is determined and compared with a target value for the volume flow. Based on a deviation between the actual and target value for the volume flow, the electronic control system (50) calculates an adapted control signal and transmits this to the electro-proportional control valve (10), as a result of which the displacement of the first hydraulic motor (5) is adaptable by means of a first servo control unit (14), which is controlled via the electro-proportional control valve (10).

4. 发明授权

US10316496B2 Hydraulic system for work machine, and work machine 有权
公开(公告)号：US10316496B2
公开(公告)日：2019-06-11
申请号：US15390536
申请日：2016-12-26
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda , Kazuyoshi Arii , Keisuke Miura , Ryosuke Kinugawa , Ikuhiro Uotani , Satoshi Tajima , Ryohei Sumiyoshi , Kunihiro Suzuki
IPC分类号： F15B11/16 , E02F9/22 , F16H61/4035 , F16H61/421 , F15B13/042 , F16H61/423 , F15B11/042 , E02F3/34
摘要： A hydraulic system for a work machine includes a hydraulic pump to supply a pilot fluid, and a hydraulic switch valve to be switched to a plurality of switching positions based on a pilot pressure. The pilot pressure is a pressure of the pilot fluid supplied from the hydraulic pump. The hydraulic system includes a direction switch valve to apply a first pilot pressure to the hydraulic switch valve to switch the hydraulic switch valve into one of the plurality of switching positions. The hydraulic system includes a pressure applying device to apply a second pilot pressure to the hydraulic switch valve. The second pilot pressure is lower than the first pilot pressure.

5. 发明授权

US10087960B2 Hydraulic displacement control system 有权
公开(公告)号：US10087960B2
公开(公告)日：2018-10-02
申请号：US15033363
申请日：2014-10-29
申请人： Raven Industries, Inc.
发明人： Jesse Wagers
IPC分类号： F16D31/02 , F15B15/04 , F15B11/16 , F16H61/4008 , F16H61/46 , F16H61/421 , F16H61/4035 , F16H61/4061 , F15B15/08 , F15B15/20
摘要： A load based pressure and flow control system including a variable displacement hydraulic motor and a flow control valve coupled with a motor inlet. A motor inlet pressure sensor is interposed between the variable displacement hydraulic motor and the flow control valve, the motor inlet pressure sensor configured to measure a motor inlet pressure at the motor inlet. An output sensor is coupled with a motor output of the variable displacement hydraulic motor and configured to measure an output characteristic of the variable displacement hydraulic motor. A displacement and flow controller of the system is configured to change displacement of the variable displacement hydraulic motor according to a pressure difference across the flow control valve between the measured motor inlet pressure and a hydraulic system pressure, and change a flow rate of hydraulic fluid through the flow control valve according to the measured output characteristic of the hydraulic motor.

6. 发明授权

US09995387B2 Hydrostatic traction drive system 有权
公开(公告)号：US09995387B2
公开(公告)日：2018-06-12
申请号：US14928336
申请日：2015-10-30
申请人： Linde Hydraulics GmbH & Co. KG
发明人： Markus Wiertellok , Wolfgang Kraft
IPC分类号： F16H61/4148 , F16H61/47 , F16H61/4008 , F16H61/421 , F16H61/46 , F16H61/4035 , F16H61/425 , F16H61/456 , B62D11/00 , B62D11/06
CPC分类号： F16H61/47 , B62D11/003 , B62D11/005 , B62D11/06 , F16H61/4008 , F16H61/4035 , F16H61/4148 , F16H61/421 , F16H61/425 , F16H61/456 , F16H61/46
摘要： A hydrostatic traction drive system of a mobile machine has a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side. The hydraulic traction motors are operated in an open circuit and are jointly supplied with hydraulic fluid by a single hydraulic pump. The first hydraulic traction motor is controlled by a first control valve and the second hydraulic traction motor is controlled by a second control valve. The first hydraulic traction motor and the second hydraulic traction motor are each variable displacement motors with an electrically variable displacement volume, and the first control valve and the second control valve are electrically actuatable control valves.

7. 发明申请

US20170324021A1 SERVO VALVE WITH ASYMETRICAL REDUNDANT PIEZOELECTRIC ACTUATOR 审中-公开
公开(公告)号：US20170324021A1
公开(公告)日：2017-11-09
申请号：US15585825
申请日：2017-05-03
申请人： ZODIAC HYDRAULICS
发明人： Jean-Luc BERTRAND , Catherine MAILHAN
IPC分类号： H01L41/09 , F15B11/05 , B60W30/18 , F02D29/04 , F16H61/421 , F15B15/02
CPC分类号： H01L41/0906 , B60W30/18 , F02D29/04 , F15B11/05 , F15B13/0436 , F15B15/02 , F16H61/421 , F16K31/004
摘要： A driving stage of a servo valve, including a hydraulic ejector and a hydraulic receiver able to be moved relative to each other, one of the two hydraulic units being integral with a mobile unit, movable relative to a body of the servo valve through actuation means, characterized in that the actuation means comprise two piezoelectric actuators connected in series. Control device comprising a servo valve comprising such a driving stage.

8. 发明授权

US09533670B2 Method for engagement and disengagement 有权
标题翻译：接触和脱离接触的方法
公开(公告)号：US09533670B2
公开(公告)日：2017-01-03
申请号：US14456232
申请日：2014-08-11
申请人： Danfoss Power Solutions Inc.
发明人： Torsten Kohmaescher
IPC分类号： B60W10/04 , B60W10/10 , F16H47/02 , B60W10/103 , B60W10/111 , F16H61/421 , F16H61/444 , F16H61/47
CPC分类号： B60W10/04 , B60W10/10 , B60W10/103 , B60W10/111 , B60Y2300/73 , F16H47/02 , F16H61/421 , F16H61/444 , F16H61/47 , F16H2047/025 , Y10T477/631
摘要： Method for engaging and disengaging a hydraulic motor which is adjustable in its displacement from and to a hydrostatic drive train of a hydromechanical transmission with a closed hydraulic fluid circuit. Two adjustable hydraulic motors and a hydraulic pump are arranged in parallel in the hydrostatic drive train and connected to a mechanical drive on the output side. At least one of the two hydraulic motors is connected to the mechanical drive via an assigned clutch. As appropriate to the driving situation, during operation of the other hydraulic motor and the hydraulic pump at least one of the hydraulic motors is engaged via the assigned clutch with the hydromechanical transmission from which the hydraulic motor was previously disengaged, likewise as appropriate to the driving situation. Before closing the clutch, the hydraulic motor to be engaged is accelerated load-free by deflecting its adjustment device in such a way that the rotational speed of an assigned clutch input shaft of the clutch is at least equal to the rotational speed of the clutch output shaft of the clutch which is connected to the mechanical gear. When the clutch is closed, both hydraulic motors act on a common output shaft of the mechanical gear.
摘要翻译：用于使液压马达接合和分离的方法，该液压马达与其具有闭合的液压流体回路的液压机械变速器的静液压驱动系统的位移可调。两个可调节的液压马达和一个液压泵并联设置在静液压传动系中，并连接到输出侧的机械传动装置。两个液压马达中的至少一个通过分配的离合器连接到机械驱动器。根据驾驶情况，在其他液压马达和液压泵的操作期间，至少一个液压马达通过分配的离合器与液压马达预先脱离的液压机械变速器接合，同样适合于驾驶情况。在关闭离合器之前，待接合的液压马达通过使其调节装置偏转而使其无负载地加速，使得离合器的分配离合器输入轴的转速至少等于离合器输出的转速离合器的轴连接到机械齿轮。当离合器关闭时，两个液压马达都作用在机械齿轮的公共输出轴上。

9. 发明授权

US09512917B2 Speed control system for hydrostatic transmission 有权
标题翻译：液压传动调速系统
公开(公告)号：US09512917B2
公开(公告)日：2016-12-06
申请号：US14302115
申请日：2014-06-11
申请人： DANFOSS POWER SOLUTIONS INC.
发明人： Frank J. Rozycki , Simon L. Nielsen , Gary R. LaFayette
IPC分类号： F16H61/4008 , F16H61/4157 , F16H61/42 , F16H61/4017 , F16H61/423 , F16H61/433 , F16H61/421
CPC分类号： F16H61/48 , F16H61/4017 , F16H61/4157 , F16H61/42 , F16H61/421 , F16H61/423 , F16H61/433
摘要： A speed control system for a hydrostatic transmission includes an engine having a drive shaft connected to a hydraulic pump. At least one hydrostatic motor is connected to the pump in a closed circuit by a flow line. Connected to the motor via a system shaft is a vehicle system. A controller is connected to a plurality of sensors and a proportional high pressure relief valve that is connected to the flow line between the pump and the motor. Based on information received from the sensors, the controller sets the pressure relief valve to limit the pressure to a valve that will not over-speed the engine and allows the demands of the speed control system to be attained. This may be accomplished through the use of various algorithms.
摘要翻译：用于静液压变速器的速度控制系统包括具有连接到液压泵的驱动轴的发动机。至少一个静液压马达通过流水线在闭合回路中连接到泵。通过系统轴连接到电机是车辆系统。控制器连接到多个传感器和连接到泵和电动机之间的流动管线的比例高压溢流阀。根据从传感器接收的信息，控制器设置减压阀，以将压力限制在不会超速发动机的阀门上，并允许实现速度控制系统的要求。这可以通过使用各种算法来实现。

10. 发明申请

US20160281831A1 GEARING DEVICE WITH SECONDARILY COUPLED POWER SPLIT 有权
标题翻译：具有二次联接功率分配的齿轮装置
公开(公告)号：US20160281831A1
公开(公告)日：2016-09-29
申请号：US14777866
申请日：2014-02-18
申请人： ZF FRIEDRICHSHAFEN AG
发明人： Jürgen LEGNER
IPC分类号： F16H47/04 , F16H61/431 , F16H61/421
CPC分类号： F16H47/04 , B60Y2304/01 , F16H61/421 , F16H61/431 , F16H2037/0866 , F16H2037/0873 , F16H2039/005 , F16H2047/045 , F16H2200/2005
摘要： A transmission device (1) with secondarily coupled power splitting in which part of an applied torque can be conducted, in a first power branch (3) at least by way of a hydrostatic system (4), and the other part of the torque can be conducted in a second power branch (5) via mechanical system (6), located between a transmission input (7) and a transmission output (8). The hydrostatic system (4) of the first power branch (3) includes at least one pump (12) and at least one motor (13) that is functionally connected to the pump by way of a hydraulic circuit, and both of the pump and motor are adjustable. The two power paths (3, 5) can be summed by a summing gear system (9). The pump (12) is made smaller than the motor (13).
摘要翻译：一种传动装置（1），其具有可以在至少通过静液压系统（4）的第一动力分支（3）中传导施加的扭矩的一部分的第二联接动力分配，并且扭矩的另一部分通过位于变速器输入（7）和变速器输出（8）之间的机械系统（6）在第二动力分支（5）中进行。第一动力分支（3）的静液压系统（4）包括至少一个泵（12）和至少一个马达（13），其通过液压回路功能地连接到泵，并且泵和电机可调。两个动力路径（3,5）可以由加法齿轮系统（9）相加。泵（12）制成小于电动机（13）。

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