公开(公告)号：US4798086A

公开(公告)日：1989-01-17

申请号：US29498

申请日：1987-03-23

Applicant: John Styfhoorn

Inventor： John Styfhoorn

IPC: F04B51/00 ,  F15B19/00

CPC classification number: F04B51/00 ,  F04B2201/1201 ,  F04B2201/1202 ,  F04B2207/044

Abstract: Test benches are useful, for example, for testing the operation of new or repaired pumps and motors. Current test benches involve directly driving the test pump with an electric motor, the horsepower of which must at least equal the horsepower rating of the test pump. The subject test bench utilizes an electric motor to drive a variable displacement pressure compensated pump. The discharge fluid from the pump drives a variable displacement hydraulic motor which in turn drives the test pump. The discharge fluid from the test pump is also directed to the hydraulic motor to add additional driving energy thereto in a regenerative manner. Thus, pumps having a higher horsepower rating several times greater than the horsepower rating of the electric motor can be effectively tested at their maximum rated displacement and pressure settings. The electric motor also drives another variable displacement pressure compensated pump, the discharge flow of which is directed to a test motor. The test motor in turn drives the variable displacement motor which thus functions as a pump to direct pressurized fluid to the variable displacement pump, which in turn functions as a motor to add additional power to the variable displacement pump through the electric motor in a regenerative manner. Thus, motors having a higher horsepower rating than the horsepower of the electric motor can also be tested on the same test bench.

Abstract translation: 测试台是有用的，例如，用于测试新的或修理的泵和电机的操作。 当前的试验台包括用电动马达直接驱动试验泵，其马力必须至少等于试验泵的马力额定值。 主题测试台利用电动机驱动可变排量压力补偿泵。 来自泵的排出流体驱动可变排量的液压马达，该马达又驱动测试泵。 来自试验泵的排出流体也被引导到液压马达，以再生的方式向其中添加额外的驱动能量。 因此，可以在其最大额定位移和压力设置下有效地测试具有比电动马达的马力额定值高几倍的马力额定功率的泵。 电动机还驱动另一个可变排量压力补偿泵，其排放流量被引导到测试电动机。 测试电动机又驱动可变容积电动机，其作为泵，以将加压流体引导到可变排量泵，变量泵又作为电动机，以再生方式通过电动机向可变排量泵增加附加功率 。 因此，具有比马达的马力更高的马力功率的马达也可以在相同的测试台上进行测试。

公开(公告)号：US4637781A

公开(公告)日：1987-01-20

申请号：US717197

申请日：1985-03-28

Applicant: Teruo Akiyama ,  Katsuyuki Sasaki ,  Takaichi Saigo

Inventor： Teruo Akiyama ,  Katsuyuki Sasaki ,  Takaichi Saigo

IPC: F04B49/00 ,  F04B49/06 ,  F04B49/08

CPC classification number: F04B49/06 ,  F04B49/002 ,  F04B49/08 ,  F04B2201/1201 ,  F04B2201/1202 ,  F04B2201/1204

Abstract: A fluid operated pump displacement control system is provided wherein a self pressure is defined as a first control signal, and characterized in that an arbitrary switchable second control signal different from the first control signal is added to the first control signal, and a displacement is adapted to be switched to a displacement corresponding to a value of the second control signal as added to the first control signal. Further, a fluid operated pump displacement control system is provided comprising a control circuit connected to respective displacement control devices of variable displacement pumps and adapted to be operated by discharge pressure fluid from a discrete control pump. A variable torque control valve has a proportional electromagnetic solenoid provided in a circuit connecting the control circuit with the control pump and is adapted to produce a pressure reduction by a discharge fluid pressure of the variable displacement pumps and a propelling force of the proportional electromagnetic solenoid. A detector detects set output conditions of a prime mover for driving the variable displacement pumps, and current is supplied to the proportional electromagnetic solenoid according to the difference between a set reference rotational speed in each of the set output conditions and an actual rotational speed of the prime mover.

Abstract translation: 提供了一种流体动力泵位移控制系统，其中自身压力被定义为第一控制信号，其特征在于，与第一控制信号不同的任意可切换的第二控制信号被加到第一控制信号上， 切换到与第一控制信号相加的对应于第二控制信号的值的位移。 此外，提供一种流体操作的泵排量控制系统，其包括连接到可变排量泵的各个排量控制装置并且适于由来自离散控制泵的排出压力流体操作的控制电路。 可变转矩控制阀具有比例电磁线圈，其设置在连接控制电路与控制泵的电路中，并且适于通过可变排量泵的排出流体压力和比例电磁螺线管的推进力产生减压。 检测器检测用于驱动可变排量泵的原动机的设定输出条件，并且根据设定的输出条件中的设定的基准转速与实际的转速之间的差异将电流提供给比例电磁螺线管 原动机。

公开(公告)号：US4599050A

公开(公告)日：1986-07-08

申请号：US698470

申请日：1985-02-05

Applicant: Naoki Ishizaki ,  Koichi Morita

Inventor： Naoki Ishizaki ,  Koichi Morita

IPC: F04D15/00 ,  F04B1/32 ,  F04B49/00 ,  F04B49/08

CPC classification number: F04B49/002 ,  F04B1/324 ,  F04B49/08 ,  F04B2201/1202 ,  F04B2201/1204

Abstract: Disclosed herein is a device for controlling displacement of a variable displacement hydraulic pump comprising a displacement control system for receiving a discharge pressure of the variable displacement hydraulic pump and a discharge pressure of a fixed displacement hydraulic pump to control the displacement of the variable displacement hydraulic pump. The displacement control system comprises a servopiston including a helical compression spring for maintaining the variable displacement hydraulic pump at a maximum swash angle in a neutral position of associated operating valve, a servovalve including a spool for selectively controlling communication of hydraulic pressure between a control pump and a pair of fluid chambers defined in the servopiston, a control piston connected through a control lever pivotably supported by a pivot pin to the spool and the servopiston, at least two helical compression springs for biasing the control piston and controlling torque and flow so as to approximate same to a constant torque curve, a floating spring seat interposed between the helical compression springs, and a guide rod for guiding the floating spring seat and accommodated in a bore formed in the housing at a base portion thereof to define a pressure chamber pressurized by a biasing spring, the pressure chamber being communicated through a conduit to a discharge passage of the fixed displacement hydraulic pump.

Abstract translation: 本文公开了一种用于控制可变排量液压泵的排量的装置，包括用于接收可变排量液压泵的排出压力的位移控制系统和固定排量液压泵的排出压力，以控制可变排量液压泵的排量 。 位移控制系统包括一个伺服机构，包括螺旋压缩弹簧，用于将可变排量液压泵保持在相关联的操作阀的中立位置处的最大斜角;伺服阀包括用于选择性地控制控制泵和 限定在伺服电机中的一对流体室，通过可枢转地由枢轴销支撑到阀芯和伺服阀的控制杆连接的控制活塞，至少两个螺旋压缩弹簧，用于偏压控制活塞并控制扭矩和流量，以便 大致与恒定扭矩曲线相同，插入在螺旋压缩弹簧之间的浮动弹簧座，以及用于引导浮动弹簧座并且容纳在其基部的形成在壳体中的孔中的导杆，以限定由 偏置弹簧，压力室通过公共部件连通 定位到固定排量液压泵的排放通道。

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。