知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

278 条记录 (耗时 0.023 秒)

    Margin valve
    11.
    发明授权
    Margin valve 失效
    边缘阀

    公开(公告)号：US4196588A

    公开(公告)日：1980-04-08

    申请号：US901409

    申请日：1978-05-01

    申请人： Howard L. Johnson

    发明人： Howard L. Johnson

    IPC分类号： F15B11/05 ,  F15B11/17 ,  F16H39/46

    CPC分类号： F15B11/17 ,  F15B2211/20538 ,  F15B2211/20553 ,  F15B2211/20584 ,  F15B2211/253 ,  F15B2211/7052 ,  F15B2211/76 ,  Y10T137/2544 ,  Y10T137/2703 ,  Y10T137/8663

    摘要： A supply or demand margin valve for use in hydraulic systems having at least one load provided with hydraulic fluid under pressure by a main pump, a pilot pump and at least one control valve for the load. The margin valve includes a valve body having a bore with a spool reciprocally received within the bore. A first port in the body extends to the bore and is adapted to be connected to the pilot pump. A second port in the body extends to the bore and spaced in relation to the first port and is adapted to be connected to a component of a hydraulic system other than a pilot pump. A spring is disposed in the valve body for applying a biasing force to the spool to urge the spool in one direction and a third port is in fluid communication with the pressure responsive surface and is adapted to be connected to a main pump so as to apply a force to the spool to urge the spool in the same direction as the spring. A fourth port connects with a pressure responsive surface for applying a force to the spool in bucking relation to the spring and a feedback passage in connection with an additional pressure responsive surface is in fluid communication with the second port for applying an additional force to the spool in bucking relation to the spring.

    摘要翻译： 用于液压系统的供应或需求裕度阀，其具有至少一个负载，所述负载通过主泵，先导泵和用于负载的至少一个控制阀在压力下提供液压流体。 边缘阀包括具有孔的阀体，该孔具有往复地容纳在孔内的卷轴。 主体中的第一个端口延伸到孔中，并适于连接到先导泵。 主体中的第二端口延伸到孔并且相对于第一端口间隔开，并且适于连接到不同于先导泵的液压系统的部件。 弹簧设置在阀体中，用于向阀芯施加偏置力以在一个方向上推动阀芯，并且第三端口与压力响应表面流体连通，并且适于连接到主泵以便施加 向阀芯施力以沿与弹簧相同的方向推动阀芯。 第四端口连接有压力响应表面，用于以与弹簧成弹性关系的方式向卷轴施加力，并且与额外的压力响应表面相关联的反馈通道与第二端口流体连通以向线轴施加额外的力 与春天的关系。

    Hydraulic controller
    12.
    发明授权
    Hydraulic controller 失效
    液压控制器

    公开(公告)号：US4189921A

    公开(公告)日：1980-02-26

    申请号：US14171

    申请日：1979-02-22

    申请人： Kenneth K. Knapp

    发明人： Kenneth K. Knapp

    IPC分类号： F04B49/00 ,  F04B49/06 ,  F04B49/08 ,  F16H61/42 ,  F16H61/433 ,  F16H61/46 ,  F16H61/465 ,  F16H39/46

    CPC分类号： F16H61/433 ,  F04B49/002 ,  F04B49/06 ,  F04B49/08 ,  F16H61/46 ,  F16H61/465

    摘要： A hydraulic controller for a hydrostatic transmission to control a number of functions of a variable displacement pump or motor of the transmission. A valve includes a spool biased in one direction by a spring and in the opposite direction by fluid pressure in a chamber communicating with the charge pump. A variable orifice communicates the chamber with a drain. The size of the orifice is controlled electrically by a signal representative of swashplate position. Depending upon the pressure of the fluid in the chamber, the valve will directly vary the pressure ported from the charge pump to the standard controller. A needle roller has one end in contact with the end of the spool communicating with the chamber. A high pressure signal is provided via a shuttle valve across the high and low pressure conduits of the transmission to the other end of the needle roller. The control valve is thereby responsive to both pump displacement and the highest pressure within the transmission thereby making it a torque limiting controller. Various other modifications are described.

    摘要翻译： 一种用于静液传动的液压控制器，用于控制变速箱的可变排量泵或电动机的多个功能。 阀包括通过弹簧沿一个方向偏置的阀芯，并且在与电荷泵连通的腔室中的流体压力沿相反方向。 可变孔口将腔室与排水管连通。 孔口的尺寸由表示斜盘位置的信号电气控制。 取决于腔室中的流体的压力，阀将直接改变从电荷泵移动到标准控制器的压力。 针辊的一端与与腔室连通的线轴的端部接触。 高压信号通过穿梭阀穿过变速器的高压和低压管道提供给针辊的另一端。 因此，控制阀响应于泵的位移和变速器内的最高压力，从而使其成为转矩限制控制器。 描述各种其它修改。

    Hydraulic control apparatus
    13.
    发明授权
    Hydraulic control apparatus 失效
    液压控制装置

    公开(公告)号：US4188787A

    公开(公告)日：1980-02-19

    申请号：US912340

    申请日：1978-06-05

    申请人： Raymond J. Bromell ,  George Homanick

    发明人： Raymond J. Bromell ,  George Homanick

    IPC分类号： B66C13/20 ,  B66D1/44 ,  F04B49/00 ,  F15B1/02 ,  F15B11/02 ,  F16H39/46

    CPC分类号： F15B11/02 ,  F15B1/02 ,  F15B2211/20546 ,  F15B2211/20561 ,  F15B2211/212 ,  F15B2211/265 ,  F15B2211/30505 ,  F15B2211/30525 ,  F15B2211/50518 ,  F15B2211/5151 ,  F15B2211/55 ,  F15B2211/57 ,  F15B2211/6313 ,  F15B2211/6355 ,  F15B2211/7052 ,  F15B2211/88 ,  Y10S417/904

    摘要： Disclosed are methods and apparatus for controlling the flow of hydraulic fluid to and from a work cylinder. The disclosed system includes a reversible variable displacement pump interconnected between a work cylinder and a selector valve which may connect the pump with any of a plurality of fluid reservoirs. The fluid reservoirs contain hydraulic fluid at variable pressures so that the pressure at the work cylinder may be raised to pressures well above the pressure differential capacity of the pump at maximum flow rate by selectively increasing the pressure on the reservoir side of the pump. The system includes means for controlling the pressure at each port of the pump so that the pressue on the output port is always greater than the pressure on the input port regardless of the direction of flow through the pump and regardless of pressures at other points in the system. Relief circuits are provided to prevent system overloading, to prevent overloading of the pump and to protect against overloading the lift apparatus employing the hydraulic system of the invention.

    摘要翻译： 公开了用于控制液压流体与工作缸流动的方法和装置。 所公开的系统包括在工作缸和选择阀之间互连的可逆变量泵，其可将泵与多个流体储存器中的任何一个连接。 流体储存器包含可变压力的液压流体，从而通过选择性地增加泵的储存器侧的压力，使得工作缸处的压力可以以最大流量升高到远高于泵的压差容量的压力。 该系统包括用于控制泵的每个端口处的压力的装置，使得输出端口上的压力总是大于输入端口上的压力，而不管流过泵的方向如何，而不管其中的其他点的压力如何 系统。 提供泄压电路以防止系统过载，以防止泵的过载并且防止使用本发明的液压系统的提升装置的超载。

    Anti-stall control for electrical hydrostatic transmission control system
    15.
    发明授权
    Anti-stall control for electrical hydrostatic transmission control system 失效
    电动液压传动控制系统的防失控制

    公开(公告)号：US4180979A

    公开(公告)日：1980-01-01

    申请号：US918117

    申请日：1978-06-22

    申请人： Charles R. Cornell

    发明人： Charles R. Cornell

    IPC分类号： F02D29/04 ,  F16H61/42 ,  F16H61/435 ,  F16H61/46 ,  F16H61/465 ,  F16H39/46

    CPC分类号： F02D29/04 ,  F16H61/435 ,  F16H61/46 ,  F16H61/465 ,  Y10S60/911

    摘要： A control system for a hydrostatic transmission is disclosed of the type including an engine driven fluid pump and a fluid motor. The control system includes a main control operable in response to an electrical command signal to vary the displacement of the pump, and a command signal generator for generating the command signal. The anti-stall control includes means for comparing electrical signals representative of engine speed and a reference speed, and generating an electrical anti-stall signal representative of the maximum percentage of commanded pump displacement which is permissible without causing the engine to drop below the reference speed. The anti-stall control includes means for electrically multiplying the anti-stall signal and the command signal, downstream of the shaping and rate limiting circuits. The invention provides a simple, inexpensive anti-stall control which can be adjusted to have the maximum possible gain (responsiveness) without inducing circuit instability.

    摘要翻译： 公开了一种用于静液传动的控制系统，其包括发动机驱动的流体泵和流体马达。 控制系统包括可响应于电命令信号而改变泵的位移的主控制器，以及用于产生命令信号的命令信号发生器。 防失速控制包括用于比较表示发动机速度和参考速度的电信号的装置，并且产生代表所允许的指令泵排量的最大百分比的电防失信号，而不会使发动机降低到参考速度以下 。 防失速控制包括在整形和速率限制电路的下游将防失速信号和指令信号电相乘的装置。 本发明提供了一种简单，便宜的防失速控制，其可以被调节以具有最大可能的增益（响应性）而不引起电路不稳定性。

    Load responsive fluid control valves
    16.
    发明授权
    Load responsive fluid control valves 失效

    公开(公告)号：US4176521A

    公开(公告)日：1979-12-04

    申请号：US899510

    申请日：1978-04-24

    申请人： Tadeusz Budzich

    发明人： Tadeusz Budzich

    IPC分类号： F15B11/044 ,  F15B13/04 ,  F16H39/46

    CPC分类号： F15B13/0842 ,  F15B11/0445 ,  F15B13/0417 ,  F15B2211/20553 ,  F15B2211/25 ,  F15B2211/3051 ,  F15B2211/30535 ,  F15B2211/3056 ,  F15B2211/3116 ,  F15B2211/50563 ,  F15B2211/575 ,  F15B2211/71 ,  F15B2211/761

    摘要： A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve. System is powered by a single fixed or variable volume pump. The direction flow control valve is equipped with a load responsive control which automatically regulates pump discharge pressure to maintain either a constant low pressure level or low pressure differential at the motor exhaust. The pump discharge pressure is either regulated by bypassing of excess flow to reservoir, or by a special load responsive control, which varies the pump displacement. Direction control valve may also be equipped with a control responsive to load pressure for controlling negative loads and an inlet pressure throttling control for simultaneous control of multiplicity of loads.

    Automatic control for a hydrostatic vehicle transmission
    17.
    发明授权
    Automatic control for a hydrostatic vehicle transmission 失效
    自动控制静液压车辆变速箱

    公开(公告)号：US4167853A

    公开(公告)日：1979-09-18

    申请号：US869235

    申请日：1978-01-13

    申请人： Karlmann Hamma ,  Willy Holdenried ,  Rudolf Michel

    发明人： Karlmann Hamma ,  Willy Holdenried ,  Rudolf Michel

    IPC分类号： F16H61/46 ,  F16H61/465 ,  F15B21/04 ,  F16H39/46

    CPC分类号： F16H61/465 ,  F16H61/46 ,  F16H61/433

    摘要： An automatic control for an automotive-vehicle hydrostatic transmission in which the engine drives a variable-displacement hydrostatic (axial-piston) pump which is connected with the motor by hydraulic lines. The hydrostatic (axial-piston) motor can be connected to the wheels of the vehicle. The control circuit comprises a filling pump, a metering throttle, a reversing valve and an adjusting device. The metering throttle is provided in a bypass between the filling pump and the reversing valve and is connected to the line communicating with the control element. A further throttle is provided in this line and has a diameter/length ratio less than 1.

    摘要翻译： 一种用于汽车液压静力传动的自动控制装置，其中发动机驱动通过液压管线与电动机连接的可变排量静液压（轴向 - 活塞）泵。 静液压（轴向 - 活塞）电机可以连接到车辆的车轮。 该控制电路包括一个灌装泵，一个计量节流阀，一个换向阀和一个​​调节装置。 计量节流阀设置在填充泵和换向阀之间的旁路中，并且连接到与控制元件通信的管线。 在该线上提供另一节流阀，其直径/长度比小于1。

    Hydraulic controller
    20.
    发明授权
    Hydraulic controller 失效
    液压控制器

    公开(公告)号：US4091617A

    公开(公告)日：1978-05-30

    申请号：US795689

    申请日：1977-05-11

    申请人： Charles R. Cornell

    发明人： Charles R. Cornell

    IPC分类号： F04B49/06 ,  F16H61/42 ,  F16H61/46 ,  F16H61/475 ,  F16H39/46

    CPC分类号： F16H61/475 ,  F04B49/06 ,  F16H61/46 ,  F04B2201/1204 ,  F04B2205/08 ,  F16H61/433 ,  Y10S60/911

    摘要： An electro-hydraulic control for a hydrostatic transmission including a variable displacement hydraulic pump and fluid operable servos to vary the displacement of the pump. The electro-hydraulic control is in series between the charge pump and the standard manual controller and determines the maximum pressure of the charge fluid ported to the standard controller. The electro-hydraulic control includes a spool biased toward a first position to port fluid from the charge pump to the standard controller, and biased toward a second position to relieve to tank the pressure of fluid ported to the manual controller. The biasing toward the second direction is accomplished, in part, by pressure in a fluid chamber exerting a biasing force on the spool, the fluid chamber being in communication with drain through a variable orifice which is variable in response to a pressure command signal. This signal is generated by control logic including a torque command signal generator which is variable to correspond to a maximum desired input torque setting and circuitry providing a torque approximation signal representing the product of pump displacement and the instantaneous pressure command signal. The circuitry compares the torque command and torque approximation signals and generates a new pressure command signal tending to minimize the difference between the torque command and approximation signals. As a result, the commanded maximum system pressure varies such that the product of maximum system pressure and pump displacement (equal to input torque) is constant, for a given input torque setting.

    摘要翻译： 一种用于静液压变速器的电动液压控制装置，其包括可变排量液压泵和流体可操作的伺服机构，以改变泵的排量。 电液控制串联在电荷泵和标准手动控制器之间，并确定输入到标准控制器的充电流体的最大压力。 电液压控制包括一个向第一位置偏置的阀芯，用于将流体从电荷泵输送到标准控制器，并且朝向第二位置偏压，以缓解输送到手动控制器的流体的压力。 朝向第二方向的偏压部分地通过在阀芯上施加偏置力的流体室中的压力来实现，流体室通过可变孔口而连通，可变孔口响应于压力指令信号而变化。 该信号由包括扭矩指令信号发生器的控制逻辑产生，转矩指令信号发生器可以变化以对应于最大期望输入转矩设置，以及提供表示泵位移和瞬时压力指令信号的乘积的转矩近似信号的电路。 该电路比较转矩指令和转矩近似信号，并产生一个新的压力指令信号，以使转矩指令和近似信号之间的差异最小化。 因此，对于给定的输入转矩设置，指令的最大系统压力变化，使得最大系统压力和泵排量（等于输入转矩）的乘积是恒定的。