公开(公告)号：US20030206805A1

公开(公告)日：2003-11-06

申请号：US10257302

申请日：2003-03-12

Inventor： Michael B. Bishop ,  Roger Pili ,  Bruce E. Knuth ,  Moe K. Barani ,  Ron Flanary ,  Laurentius A.G. Mentik ,  George R. Steber ,  Martin Piedl

IPC: F04B049/06

CPC classification number: F04B1/0426 ,  F04B23/103 ,  F04B49/20 ,  F04B2201/1203 ,  F04B2203/0201 ,  F04B2203/0207 ,  F04B2203/0208 ,  F04B2203/0209

Abstract: The invention provides a variable speed hydraulic pump designed to operate at a maximum horsepower throughout its pressure range by adjusting motor speed according to motor load parameters. In particular, the variable speed hydraulic pump includes a hydraulic pump unit coupled to a variable speed electric motor by a drive unit and to a hydraulic fluid tank for pressurizing and pumping hydraulic fluid when operated by the motor. A motor controller is electrically connected to the motor to supply drive signals to the motor based on electrical characteristics of the drive signals which are dependent on the load exerted on the motor. Suction from the load is provided by both the main pump and a bidirectional supercharging pump by reversing the direction of the motor and shifting a 4/3 valve to connect the main pump inlet to the load and its outlet to tank. In addition, the controller reduces the motor speed at the maximum rated pressure to just maintain the pressure, to reduce the amount of fluid pumped through the maximum pressure relief valve.

Abstract translation: 本发明提供了一种变速液压泵，其设计为通过根据电动机负载参数调整电动机速度在其整个压力范围内以最大功率运行。 特别地，变速液压泵包括通过驱动单元连接到变速电动机的液压泵单元和用于在由电动机操作时对液压流体进行加压和泵送的液压油箱。 电动机控制器电连接到电动机，以基于驱动信号的电特性向电动机提供驱动信号，驱动信号取决于施加在电动机上的负载。 从主泵和双向增压泵通过反转电机的方向和移动4/3阀将主泵入口连接到负载及其出口到罐而由负载提供吸力。 此外，控制器将电机速度降低到最大额定压力，以保持压力，以减少通过最大压力释放阀泵送的液体量。

公开(公告)号：US06623247B2

公开(公告)日：2003-09-23

申请号：US09858738

申请日：2001-05-16

Applicant: Hongliu Du

Inventor： Hongliu Du

IPC: F04B4900

CPC classification number: F04B49/065 ,  F04B1/324 ,  F04B2201/1203 ,  F04B2201/1204 ,  F04B2201/1205 ,  F04B2203/0208 ,  F04B2203/0604 ,  F04B2205/05

Abstract: A method and apparatus for controlling a variable displacement hydraulic pump having a swashplate pivotally attached to the pump. The method and apparatus includes determining a desired swashplate angle as a function of a power limit of the pump, determining an actual swashplate angle, determining a value of discharge pressure of the pump, moving a servo valve spool to a desired position as a function of the desired swashplate angle, the actual swashplate angle and the discharge pressure, and responsively moving the swashplate to the desired swashplate angle position.

公开(公告)号：US6094911A

公开(公告)日：2000-08-01

申请号：US216441

申请日：1998-12-18

Applicant: Claude T. Crawshaw

Inventor： Claude T. Crawshaw

IPC: E02F9/22 ,  F04B49/00 ,  F15B11/16 ,  F16D31/00

CPC classification number: F04B49/002 ,  E02F9/2225 ,  E02F9/2232 ,  E02F9/2296 ,  F15B11/165 ,  F04B2201/1203 ,  F04B2203/0208 ,  F15B2211/20523 ,  F15B2211/20553 ,  F15B2211/251 ,  F15B2211/253 ,  F15B2211/3052 ,  F15B2211/3056 ,  F15B2211/3138 ,  F15B2211/327 ,  F15B2211/40507 ,  F15B2211/50518 ,  F15B2211/50536 ,  F15B2211/528 ,  F15B2211/55 ,  F15B2211/6054 ,  F15B2211/615 ,  F15B2211/71

Abstract: A hydraulic system having a load sensing capability with a high pressure cut-off either operational or bypass is disclosed. The hydraulic system includes a pump having variable displacement under control of a pump control signal, a signal duplicator, at least one pressure relief device operable in cooperation with the signal duplicator, and at least one working element driven by the pump. The system includes a high pressure cut-off selector operable in a first mode to allow the signal duplicator to provide the control signal, and in another mode to allow a true signal to control the pump. The system includes a differential relief valve operable to prevent relief flow therethrough when the signal duplicator pressure exceeds the pump output pressure, and to allow relief flow therethrough when pump pressure exceeds the signal duplicator pressure, such that a load sensing capability is maintained under high pump pressure conditions using either the duplicator signal or the true signal for pump control.

Abstract translation: 公开了一种具有负载感测能力的液压系统，其具有操作或旁路的高压截止。 液压系统包括在泵控制信号的控制下具有可变位移的泵，信号复制器，与信号复制器协作操作的至少一个减压装置以及由泵驱动的至少一个工作元件。 该系统包括一个高压截止选择器，可在第一模式下操作，以允许信号复制器提供控制信号，另一种方式允许真实信号控制泵。 该系统包括一个差动减压阀，当信号复制器压力超过泵的输出压力时，可以防止溢流流过其中，并且当泵的压力超过信号复制器的压力时允许溢流流过，从而在高泵下保持负载检测能力 使用复印机信号或用于泵控制的真实信号的压力条件。

公开(公告)号：US4443159A

公开(公告)日：1984-04-17

申请号：US249665

申请日：1981-03-26

Applicant: Jorg Dantlgraber

Inventor： Jorg Dantlgraber

IPC: F04C14/22 ,  F04B49/00 ,  F04B49/08 ,  F04B49/12

CPC classification number: F04B49/08 ,  F04B49/128 ,  F04B2201/1203

Abstract: A power output control device for a pump having a delivery adjuster, is formed of a housing including a control piston attacked at one end with the output medium of the pump and having means for controlling the pump adjuster; a two-armed rocking lever is supported in the housing for movement parallel to the axis of the control piston, one arm of the lever being biased by a governor spring having a progressive biasing force while the other arm of the lever acts on the control piston against the force of pressure medium; an additional biasing spring thrusts against the other arm of the lever and a first setting screw adjusts the biasing force of the additional biasing means and a second setting screw adjusts the biasing force of the governor spring by adjusting the position of the pivot point of the two-armed rocking lever.

Abstract translation: 一种用于具有输送调节器的泵的动力输出控制装置由壳体形成，壳体包括一端与泵的输出介质碰撞的控制活塞，并具有用于控制泵调节器的装置; 双臂摇摆杆支撑在壳体中以平行于控制活塞的轴线移动，杠杆的一个臂由具有渐进偏压力的调速器弹簧偏置，而杠杆的另一个臂作用在控制活塞上 抵抗压力介质的力; 附加的偏压弹簧抵靠杆的另一个臂并且第一调整螺丝调节附加偏置装置的偏置力，而第二调整螺丝通过调节两个枢转点的位置来调节调速器弹簧的偏置力 手摇摇杆。

公开(公告)号：US3942375A

公开(公告)日：1976-03-09

申请号：US514138

申请日：1974-10-11

Applicant: J. D. Shepherd

Inventor： J. D. Shepherd

IPC: F04B51/00 ,  F04D15/00 ,  G01L3/20 ,  G01M13/00 ,  G01M19/00

CPC classification number: G01M13/00 ,  F04B51/00 ,  F04D15/0088 ,  F04B2201/1202 ,  F04B2201/1203 ,  F04B2205/05 ,  F04B2205/09 ,  F04B2205/11

Abstract: The testing method and means of the present invention utilizes a conventional dynamometer for testing a hydraulic pump. The dynamometer is used to mechanically drive the pump and the hydraulic system of the dynamometer is used to supply the test pump with hydraulic fluid. A flow rater is connected to the tested pump for registering the pressure, flow rate, and temperature of the fluid being pumped by the test pump.

Abstract translation: 本发明的测试方法和方法利用传统的测力计来测试液压泵。 测力计用于机械驱动泵，测功机的液压系统用于向试验泵供应液压油。 流量计连接到被测试的泵，用于记录由测试泵泵送的流体的压力，流量和温度。