| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 181 | Torque generator steering device | US997441 | 1997-12-23 | US5873243A | 1999-02-23 | Sohan L. Uppal; Leslie J. Kasper |
| A torque generator steering device (11) including a gerotor gear set (17) disposed adjacent an end cap (15) and having the input shaft (21) extending through the end cap and through the orbiting and rotating star member (31). The valving of the device, including a spool valve (37) and a sleeve valve (39), is disposed on the side of the gerotor gear set (17) toward an output shaft (23). Preferably, the input shaft (21) is integral with the spool valve (37), and the sleeve valve (39) is integral with the output shaft (23). A coupling arrangement (77) is provided to translate orbital and rotational movement of the star (31) into rotational follow-up movement of the sleeve valve (39). The result is a very short, compact torque generator having substantially reduced backlash between the input shaft (21) and the output shaft (23). | ||||||
| 182 | Torque or force amplifying actuator and method for controlling actuator | US677131 | 1996-07-09 | US5791228A | 1998-08-11 | Vito R. Gervasi |
| A hydraulic or pneumatic actuator wherein the movement of the power transfer shaft is controlled by a movable vent. The actuator is divided into two cells by a power transfer shaft to which is attached a vent follower. In an equilibrium position, the vent is closed off by the vent follower. Moving the vent location to either side of the vent follower causes fluid or gas to escape from one or the other cell. This creates a pressure difference between the cells causing the vent follower to move until it arrives at an equilibrium position. When the vent follower is caused to move the power transfer shaft also moves accordingly. In the rotary version, the vent follower operates in a wiper-type fashion. Movement of the vent follower causes the power transfer shaft to rotate. In the linear version, the power transfer shaft is attached to a piston head. The piston head is fitted into a cylinder which divides the cylinder into two hydraulic or pneumatic cells. The power transfer shaft extends out of one of the cylinders. The position of the vent can be moved to either side of the piston. When the vent is moved to one side of the piston, a pressure imbalance occurs across the piston forcing it to move in the direction of the vent. When the piston moves, the power transfer shaft moves in or out as the case may be. | ||||||
| 183 | High-flow direct-drive rotary servovalve | US555574 | 1995-11-08 | US5597014A | 1997-01-28 | Ralph L. Vick |
| A rotary valve (10) is adapted to be associated with a fluid source (P) and a fluid return (R), and is adapted to control the flows of fluid (via control ports C.sub.1 and C.sub.2) with respect to the opposed chambers of a fluid-powered load. The valve has a body (11) provided with an elongated bore (12). The body has a plurality of passageways (23, 24, 25, 26) communicating spaced locations along the bore with the source, return and load control ports, respectively. A spool member (28) is rotatably mounted in the bore. The spool member has a passage adapted to cooperate with a body passageway so as to define at least one flow-metering port therebetween. The area of this flow-metering port or orifice (34) is a function of the angular displacement of the spool member relative to the body from a null position. The improvement comprises each of the upstream approach walls (32, 35) adjacent the orifice being relieved at an angle (.beta.) of at least 21.degree. with respect to a radial plane so as to cause the flow through the orifice, whether directed inwardly or outwardly, to be substantially radial, thereby to eliminate tangential Bernoulli reaction forces acting on the spool member. | ||||||
| 184 | Rotary servo actuator with internal valve | US568277 | 1990-08-15 | US5020417A | 1991-06-04 | Paul P. Weyer |
| A fluid-powered servo actuator having a body, an annular piston, and a shaft extending co-axially therewithin. The shaft has an interior chamber located within the body with two fluid channels extending to the chamber in which the piston is mounted. One channel communicates with each side of the piston. A valve spool is positioned in the shaft chamber, and a cam follower or threads are used to longitudinally move the valve spool therewithin in response to its selected rotation. The valve spool has a pair of valve lands which, when in a neutral position, close the two channels. When the valve spool is moved longitudinally, pressurized fluid is communicated with one or the other of the channels to cause the piston to move longitudinally. Splines or rollers convert the longitudinal movement of the piston into rotational movement of the shaft. The cam follower or threads cause the resulting rotational movement of the shaft to move the valve spool back to the neutral position when the shaft has rotated by an amount and in a direction corresponding to the selected amount and direction the valve spool was rotated. | ||||||
| 185 | Hydraulic motor control system with rotating servo-valve | US502577 | 1990-03-30 | US4977816A | 1990-12-18 | Werner Kuttruf |
| A hydraulic control mechanism to control operating elements, such as a hydraulic motor, or hydraulic cylinder, employing presetting of a set point, for example via a stepping motor, and mechanical feedback of an actual value. Functional elements are provided in the form of rotary pistons that fit inside one another, rotating relative to one another, and serving for the sensitive regulation of the direction and quantity of a pressure medium stream that is supplied from a pressure medium source to the operting element and flows back therefrom to the tank. One rotary piston is positively connected with the presetting of the set point, and the other rotary piston is positively connected with the operating element for the mechanical actual value feedback. In this way, in contrast to known control mechanisms where a slide or seat valve is actuated by a longitudinal movement, the rotational movement of the set point and actual value are directly compared with one another. This results in a considerably greater precision both statically (positioning precision, concentricity) as well as dynamically (sequence trueness, path deviation). The control mechanism is a better overload safety device, has a simpler construction, and is more economical. | ||||||
| 186 | Hydraulic valve control and feedback utilizing a harmonic drive differential | US337193 | 1982-01-05 | US4449442A | 1984-05-22 | Steven J. Ebbing; Robert J. Hermans |
| This invention relates to a motor control unit and a feedback arrangement to minimize the effects of backlash in a rotary output system. The system includes a source of energy. The motor control has a directional control element moveable from a null position. The motor control unit is coupled to the source of energy and to a motor which in turn is coupled to the rotary output and to a second input of a differential harmonic drive that has first and second inputs and an output. The first input of the differential harmonic drive is coupled to a rotational command input unit and the differential harmonic drive output is drivingly coupled to the moveable direction control element. In response to a given rotational command input when the second input is in an initial static position, whereupon the motor is coupled to the source of energy through the motor control unit, the rotary output is driven a precise number of revolutions dependent upon the given rotational command input. The second input is simultaneously driven a given number of revolutions in a direction to provide feedback, such that the differential harmonic drive output moves to return the moveable element to the null condition, and the system is then in a condition to respond to additional rotational command input. | ||||||
| 187 | Pressure regulator for a fluid motor | US276142 | 1981-06-22 | US4420014A | 1983-12-13 | Robert R. Riggs; Paulmer D. Hunt |
| A regulator assembly which receives a variable reference signal to control the fluid pressure of a supply fluid supplied to a motor. The variable reference signal which represents the work performed by the motor also passes through a relief valve. When the output torque of the motor reaches a predetermined value, the relief valve opens and a portion of the fluid supplied to the motor is vented to an exhaust conduit to protect any mechanism operated by the motor from receiving excessive torque. | ||||||
| 188 | Hydraulic motor control | US914065 | 1978-06-08 | US4194365A | 1980-03-25 | Rene G. Stoufflet; Victor Yeou |
| A control system for stopping a hydraulic motor in a predetermined position comprises a valve connected in parallel across the motor, the valve having a closed position and an open position in which flow is via a throttle orifice. When the motor is being driven normally the valve is closed. When the main control regulator for the motor is moved to stop the motor, the valve is automatically opened to allow limited fluid flow through the motor during a slowing down phase. A detector senses when the motor is a predetermined distance from its desired stopping position, and moves the valve to its closed position. Overload valves are provided to prevent overpressures. | ||||||
| 189 | Hydraulic speed change gear having an automatic pressure control device | US775322 | 1977-03-07 | US4087969A | 1978-05-09 | Noriyuki Takahashi; Masao Nishikawa |
| A hydraulic speed change gear designed to automatically control its hydraulic circuit pressure to be held at all times at a substantially constant level irrespective of the loading condition so as to enable the pressure oil in the hydraulic circuit to be used as a pressure source for other various hydraulic equipment. To this end, the gear includes a fixed displacement hydraulic pump adapted to be driven by an input shaft, a variable displacement hydraulic motor having an output shaft, a closed hydraulic circuit connecting between said pump and said motor, a hydraulic supply pump drivably coupled to said input shaft, a supply passage connected with a discharge port of said supply pump and with said closed hydraulic circuit through check valves, and an oil pressure control device connected with said closed hydraulic circuit and said supply passage for reducing the oil pressure in said supply passage in proportion to a pressure rise in said closed hydraulic circuit. | ||||||
| 190 | Control valve and fluid motor arrangement | US36333873 | 1973-05-24 | US3863546A | 1975-02-04 | SAIDA YOUICHI; ITO HAJIME; IMANAGA KOJIRO |
| A control valve for a rotary type hydraulic servo-actuating mechanism comprising a hollow casing having therewithin a valve portion and a manifold portion, pressurized oil feeding and discharging ports communicated with the valve portion, a spindle slidably and rotatably mounted in the hollow casing, and a pair of oil paths axially formed in the spindle and communicated with long grooves open to the valve portion in the hollow casing. The valve is further provided with means to feed back thereto the motion derived from the servo-actuating mechanism.
|
||||||
| 191 | Hydraulic, rotary servo-actuator | US40762973 | 1973-10-18 | US3858484A | 1975-01-07 | SAIDA YOUICHI; ITO HAJIME; IMANAGA KOJIRO; JYUMONJI TOMOJI |
| A hydraulic, rotary servo-actuator of the type having a casing, a first control valve, an input shaft provided therewithin with hydraulic fluid supply and discharge passageways, and a hydraulically actuated member further has other hydraulic fluid supply and discharge passageways formed within its casing and respectively communicating with a fluid supply source and a fluid reservoir both outside the servo-actuator and a second control valve formed within the casing and operating to communicate and shut off selectively these other passageways respectively with and from the passageways formed within the input shaft thereby to prevent excessive actuated movement of the hydraulically actuated member.
|
||||||
| 192 | Control equipment for hydrostatic or hydraulic systems (ii) | US30414572 | 1972-11-06 | US3804119A | 1974-04-16 | CHRISTENSEN H |
| The invention relates to a control valve assembly for a hydrostatic control system such as a power steering assembly. A common control valve assembly of this type has relatively rotatable inner and outer elements connected respectively to a vehicle steering wheel and a servomotor. Paired holes in the inner and outer elements permit the flow of fluid therethrough when the unit is in its neutral position with the paired holes in respective registration. In prior art units disturbing vibrations occur during the transition from the neutral position to a working position when the paired holes are moved out of registration. These vibrations are eliminated by making the holes in the outer element of varying size and larger than the corresponding holes in the inner element so that a gradual or progressive reduction of the porting area takes place instead of the paired holes closing simultaneously. Also, a chamber having a flow restricting orifice is incorporated downstream from the holes of the inner element. This provides a sound absorbing system by means of which disturbing noises can be greatly reduced.
|
||||||
| 193 | Power transmission | US3747350D | 1972-02-03 | US3747350A | 1973-07-24 | WEST D; MARTIN W |
| A hydraulic power transmission for driving and braking high inertia loads, such as the swing mechanism of a power shovel, uses a directional valve to control flow between the pressure source and the motor and a pilot operated relief valve to regulate the pressure in the supply. A triplex controller modulates the pilot pressure applied to the relief valve and simultaneously that applied to variably shift the directional valve. This enables an operator to modulate the pressure applied either in a driving or a braking direction to the fluid motor. When in the braking mode, the supply pressure is maintained at a low level only sufficient to charge the motor inlet while the motor decelerates.
|
||||||
| 194 | Process for controlling and regulating piston-driven engines with hydrostatic motion transducers | US3704585D | 1970-12-14 | US3704585A | 1972-12-05 | RABIGER WOLFGANG |
| An apparatus and method for controlling a piston engine hydrostatic movement convertor by activating a valve for applying fluid to and for withdrawing fluid from the convertor. The valve is controlled by a correspondence error signal and a dead point error signal. The former signal is derived from a comparison of the position of the piston and the angle of rotation of a driving shaft and represents divergence of the piston and shaft from their required relative positions. The dead point error signal is derived from measuring any discrepancy between a nominal dead point and the actual dead point attained by the piston. At any instant, one of the error signals controls the fluid valve as determined by the engine speed. When the engine speed is below a predetermined rate the correspondence signal regulates, and when the speed is faster the dead point error signal controls. Preferably, the transfer of control from the correspondence error signal to the dead point error signal occurs at a higher speed than that at which transfer is made from the dead point error signal to the correspondence error signal.
|
||||||
| 195 | Electro-hydraulic servomotor | US3530764D | 1968-12-26 | US3530764A | 1970-09-29 | TOMITA TAMAKI |
| 196 | Control valve for use with hydraulic step motor | US3499468D | 1968-04-25 | US3499468A | 1970-03-10 | TSUCHIYA YOSHITSUGU |
| 197 | Control valve for use with fluid step motor | US3489177D | 1967-07-19 | US3489177A | 1970-01-13 | TSUCHIYA YOSHITSUGU; UYAMA KAZUYOSHI |
| 198 | Control mechanism for machine tool | US46654065 | 1965-06-24 | US3315569A | 1967-04-25 | DEVER LEWIS A |
| 199 | Valve | US43385665 | 1965-02-19 | US3280842A | 1966-10-25 | WEISENBACH CHARLES O |
| 200 | Hydraulic system | US43716765 | 1965-03-04 | US3273860A | 1966-09-20 | WEISENBACH CHARLES O |
QQ群二维码
意见反馈
意见反馈