| Patent Number |
Title Of Patent |
Date Issued |
| 6047732 |
Directional control valve |
April 11, 2000 |
| A directional control valve has snap-locking device for retaining the slide of the directional control valve in at least one switching position. The snap-locking device has a snap-locking part with a snap-locking piston that allows an engagement part to engage and lock the slide of the |
| 5857333 |
Control system for hydraulic power units |
January 12, 1999 |
| The present invention relates to a control system for hydraulic power units, in particular hydraulic cylinder-piston-assemblies comprising a valve to be controlled by an electronic controller, the valve controlling the fluid path between the power unit, a pressure source and a reservoir. |
| 5852933 |
Hydraulic drives system for a press |
December 29, 1998 |
| The invention relates to a drive system for a hydraulic press. The drive system is of the type of secondary controlled system maintaining an impressed pressure of substantially constant magnitude in a pressure system. A hydraulic transformer comprises a pair of mechanically coupled h |
| 5829335 |
Control for hydraulic drive or actuator |
November 3, 1998 |
| A control for a hydraulic drive or actuator is provided, wherein the actuator has pressurized operating fluid applied thereto, and wherein the operating fluid is directed through an electrically controlled valve for establishing the amount of operating fluid to be fed to the actuator. An |
| 5726877 |
Method for the adaptive adjustment of the control parameters of an electro-hydraulic axis of mot |
March 10, 1998 |
| The invention relates to a servo hydraulic force controlled system comprising a cylinder, a control valve and a controller as well as a load defining the controlled system. The optimum setting of the controller is automatically performed by using a fuzzy-set-logic, wherein the charac |
| 5725361 |
Hydraulic unit |
March 10, 1998 |
| A hydraulic unit having a hollow oil container which has a receiving space for oil between an external outer wall and an internal outer wall, and having a pump unit which comprises an electric motor and a pump which can be driven by the electric motor. Such a hydraulic unit is to be furt |
| 5724223 |
Control of a proportional valve using mains voltage |
March 3, 1998 |
| A proportional valve has an output proportional to an electrical input signal. In a preferred embodiment, the valve is actuated by a proportional solenoid having a coil which is controlled by a control signal in proportion to voltage or current. The proportional solenoid is controlled |
| 5720168 |
Control device for a hydraulic pump |
February 24, 1998 |
| A control system for a variable-displacement hydraulic pump having an adjustment device and being electrical current-adjustable as required for supplying pressure to a first hydraulic apparatus (13), and pressure-adjustable for supplying pressure to a second hydraulic apparatus (14), |
| 5716051 |
One-piece seal with fastening section and sealing section |
February 10, 1998 |
| A one-piece axial seal is provided for sealing a passage at the interface between a first component and a second component, in particular a fluid conduit or a screw hole. The seal has a fastening section, comprising a projection adapted to be pressed into a bore provided in the first |
| 5713331 |
Injection and exhaust-brake system for an internal combustion engine having several cylinders |
February 3, 1998 |
| An injection system for an internal combustion engine having a plurality of cylinders is known which has a hydraulic pump with a delivery outlet to which a delivery line common to the cylinders is connected, and a plurality of injection units each of which is associated with a different |
| 5697336 |
Engine brake for a multi-cylinder internal combustion engine |
December 16, 1997 |
| The present invention proceeds from an engine brake for a multi-cylinder internal combustion engine with decompression valves actuatable by pressurization of hydraulic pistons outside of the exhaust stroke of the working piston of the internal combustion engine, in particular at the end |
| 5687816 |
Underground storage space |
November 18, 1997 |
| In an underground storage space, particularly for endangered goods, access is effected via a left the opening of which, leading into the storage space, can be closed by two covers which are arranged spaced apart from each other. |
| 5676109 |
Hydraulic system, in particular an engine brake for an internal combustion engine |
October 14, 1997 |
| The invention is based on a hydraulic system, in particular of an engine brake for an internal combustion engine, having at least one hydraulic actuating element, a positive displacement pump by which pressurized fluid can be pumped from a low-pressure region into a high-pressure region, |
| 5662390 |
Method and appliance for controlling a power-brake valve |
September 2, 1997 |
| In a power-brake system, a hydraulic pressure generated by means of a pump may be supplied, controllably in proportion to an actuation force via brake conduits, by a power-brake valve to individual brake cylinders. Control pressure conduits are connected to the brake cylinders or the |
| 5640892 |
Hydraulic control device |
June 24, 1997 |
| A hydraulic control device having a directional valve by means of which the direction of movement and the speed of a hydraulic consumer, especially a mobile working device can be modified. The hydraulic control device has a hydraulic pre-control device by which a control pressure can be |
| 5638678 |
Hydraulic drive system |
June 17, 1997 |
| A hydraulic drive system includes a first driven hydrostatic machine adjustable in volume and operating as a pump supplying fluid to a supply line for maintaining an impressed pressure therein, a second hydrostatic machine which is adjustable in volume and is connected to the supply line |
| 5628188 |
Torque control of hydrostatic machines via the pivot angle or the eccentricity of said machines |
May 13, 1997 |
| A circuit arrangement for controlling the output torque of a hydrostatic machine connected to a hydraulic system having an impressed operating pressure. The circuit arrangement has a control element for changing the output torque of the machine based upon operating parameters correspondi |
| 5591015 |
Constructional unit consisting of a hydraulic machine (hydraulic pump or hydraulic motor) and a |
January 7, 1997 |
| A constructional unit comprising a hydraulic machine having a drive or driven shaft and of a support by which the hydraulic machine is held with the interposition of material which deadens solid-conducted noise. Low noise emission of the hydraulic machine is obtained in the manner that t |
| 5558004 |
Control arrangement for at least one hydraulic consumer |
September 24, 1996 |
| A control arrangement for at least one hydraulic consumer in which the consumer can be controlled with respect to direction and speed via a directional control valve device, in which two consumer lines lead from the directional control valve device to the consumer, each of which cons |
| 5528911 |
Hydraulic control apparatus for a plurality of users |
June 25, 1996 |
| The present invention provides for a control apparatus for independently operating at least two users. The users can be the tilt cylinders and the lift cylinders of a loader. The control apparatus provides for the adjustment of the control valves and for the adjustment of the pressure |
| 5469704 |
Hydraulic drive apparatus comprising a cylinder |
November 28, 1995 |
| The invention relates to a hydraulic drive apparatus having a cylinder. Said cylinder comprises a piston movably mounted in a working chamber, a piston rod which is guided towards the outside through a cylinder head and a wear resistant primary seal and a leakage free secondary seal. Bot |
| 5410946 |
Hydraulic actuator |
May 2, 1995 |
| A hydraulic actuator including a single cylinder body which defined therein a pressure chamber in which a first piston with a piston rod and a second piston with a piston rod are independently movably inserted, a first working member secured to the first piston rod, a second working memb |
| 5341311 |
Method and apparatus for limiting the capacity of a hydrostatic machine |
August 23, 1994 |
| The present invention relates to a hydraulic secondary control system comprising a hydrostatic machine as a secondary unit which is connected to a pressure line in which an impressed pressure of approximately constant value is generated by a hydrostatic machine as a primary unit. The vol |
| 5333450 |
Apparatus for adjusting the working fluid pressure |
August 2, 1994 |
| An apparatus for adjusting the pressure of working fluid provided to the load or user via a hydraulically actuatable control valve is provided. The apparatus includes a comparator that compares a given or desired control pressure for the control valve with the predominant present load pr |
| 5332371 |
Hydraulic system |
July 26, 1994 |
| The present invention relates to a noise dampening assembly of a hydraulic machine and a drive motor, and provides for a structure comprising a block, in which the hydraulic machine is mounted by means of noise dampening elements. |
| 5326230 |
Closed loop control circuit for variable hydraulic pump |
July 5, 1994 |
| Closed loop control circuit for a variable hydraulic pump the output flow of the pump being variable by control means and the pump including at least two closed loop controllers actuating the control means, wherein at least one hydraulic switching element is provided which automatically |
| 5315829 |
Hydraulic system for hydraulic operators |
May 31, 1994 |
| The invention relates to a hydraulic system for hydraulic operators for delivering pressurized fluid to a blower drive means and to the hydraulic operators of a hydraulic machine, comprising a variable delivery pump, control valves connecting the hydraulic operators and the blower drive |
| 5315828 |
Valve assembly for load independent control of multiple hydraulic loads |
May 31, 1994 |
| The present invention relates to a valve assembly for the supply of users in hydraulic control systems with pressurized fluid for the load pressure (LS) independent control of several simultaneously actuated hydraulic users wherein the ratio of the partial flows once set is maintained at |
| 5314118 |
Piezoelectric controllable nozzle resistance for hydraulic apparatus |
May 24, 1994 |
| A nozzle resistance controlled by a piezoelectric element comprises a housing having a longitudinal bore, a piezoelectric element located in the longitudinal bore, a baffle plate supported by the piezoelectric element, a nozzle body located in the longitudinal bore such, that the bore |
| 5311974 |
Valve arrangement for a hydraulic transmission circuit |
May 17, 1994 |
| A valve arrangement for a hydraulic transmission circuit, in particular for a change-under-load transmission with a clutch valve arrangement for controlling at least one clutch and/or start-up clutch with the aid of a pressure-regulating valve whose normal position can be influenced |
| 5311548 |
Digital control electronic having a pulse width modulated (PWM)-output signal for the control of |
May 10, 1994 |
| A digital electronic control apparatus for controlling at least one electronic control element comprises. The apparatus comprises first and second pulse width modulated output signal generators, the frequency of the second signal being different from the first. The second pulse width |
| 5309881 |
Engine brake for a multicyclinder internal combustion engine |
May 10, 1994 |
| An engine brake for a multicylinder internal combustion engine includes valves that can be periodically opened briefly, in each case outside the exhaust stroke. In the vicinity of the applicable valve drive, a hydraulic piston is provided that is triggered synchronously with the engine r |
| 5295663 |
Pressure control valve |
March 22, 1994 |
| A pressure control valve is provided comprising an inlet bore, an annular channel and a control spool. So as to obtain a low control deviation and good stability an annular channel is provided at the outlet side of the valve. The axial extension of said annular channel is smaller than th |
| 5291915 |
Adjustable pressure relief valve |
March 8, 1994 |
| A pressure relief valve system is provided that makes it possible to provide numerous varied pressure relief functions with a minimum of structural changes. For this purpose, a standard distributing valve housing is equipped with a valve core that makes it possible to construct a dou |
| 5261232 |
Valve system for supplying fluid from a pair of fluid pressure sources to a load |
November 16, 1993 |
| The invention relates to a valve system for supplying fluid from a pair of fluid pressure sources to a load. A feed valve is provided which feeds--when required--a partial flow of the second fluid pressure source into the feed line of the load which is connected to the first fluid pr |
| 5257605 |
Engine brake for a multicylinder internal combustion engine |
November 2, 1993 |
| An engine brake for a multicylinder internal combustion engine includes valves that can be periodically opened briefly, in each case outside the exhaust stroke. In the vicinity of the applicable valve drive, a hydraulic piston is provided that is triggered synchronously with the engine r |
| 5247872 |
Multi-stage hydraulic actuator |
September 28, 1993 |
| A multi-stage hydraulic actuator including a cylinder body having an outer cylinder and an inner cylinder provided in the outer cylinder, first and second pistons inserted in the outer cylinder to independently move and provided with first and second working members, and third and fourth |
| 5245826 |
Vibration suppression apparatus for hydraulic system with improved accumulator filing circuit |
September 21, 1993 |
| A hydraulic control circuit for building machinery includes a hydraulic cylinder to operate a tool. To stabilize vibrations of the tool around the pitch axis, a hydraulic accumulator is provided to be connected to a pressure source via a fill line. A shut-off valve is disposed in the fil |
| 5239912 |
Hydraulic circuit to limit static and/or dynamic pressure loads |
August 31, 1993 |
| A circuit for limiting a static and/or dynamic pressure load in a hydraulically actuated use device which is controlled in a closed control circuit by means of a directional control valve and a mechanically or hydraulically releasable blocking device. Aa pressure control valve is arr |
| 5236319 |
Vane pump |
August 17, 1993 |
| A vane pump or a vane motor is here specified, having a variable displacement volume. The vane pump has a vane rotor and an annular stator that surrounds the rotor eccentrically and that is stabilized by means of a piston arrangement for adjusting the eccentricity that determines the |
| 5230272 |
Hydraulic positioning drive with pressure and position feedback control |
July 27, 1993 |
| A hydraulic drive is actuated by a CNC means via an electrically actuable valve. The pressure applied to the hydraulic drive or the force excerted by the hydraulic drive is supplied in the form of a signal to a pressure control means or a force control means. The output signal of the pre |
| 5222886 |
Cheek plate for a vane pump |
June 29, 1993 |
| A cheek plate for a vane pump is provided which is made of an aluminum alloy. The cheek plate has a first or casing face which faces towards the casing of the pump when installed in the pump. A second or rotor face of the cheek plate faces the rotor when the cheek plate is installed in t |
| 5218990 |
Multiway valve with piston slide valve |
June 15, 1993 |
| A multiway valve, which includes a piston slide valve and at least five control chambers, of which a middle chamber comprises an intake chamber for a pressure medium, chambers adjacent the middle chamber are connected to actuators, and chambers outside the adjacent chambers are connected |
| 5187933 |
Variable displacement pump with hydraulic adjustment for controlling the delivery rate and/or th |
February 23, 1993 |
| The invention relates to a variable displacement pump supplying fluid to a number of consumers. The pump control for adjusting the delivery rate is actuated by a signal which is produced by the respective highest loaded consumer. The signal is provided by a valve, in particular a pressur |
| 5182909 |
Valve system for load-independent hydraulic control of a plurality of hydraulic consumers |
February 2, 1993 |
| A valve system is provided for the load-independent control of a plurality of simultaneously operated hydraulic consumers, i.e. regardless of variations in load pressure. Fluid flow in a consumer line to each consumer passes across a compensating flow control valve, i.e. a compensato |
| 5180296 |
Hydraulic machine having axial user ports |
January 19, 1993 |
| A circular piston engine or machine is provided having a rotor with outer teeth and fixedly connected for rotation with the shaft. The rotor cooperates with an outer gear having inner teeth. The outer gear is supported by the housing at its outside and the user ports extend axially i |
| 5179889 |
Radial piston engine |
January 19, 1993 |
| A radial piston engine is provided having recesses in the area of movement of the rollers, adapted to receive roller sections on both roller end faces. For guiding the roller end faces, oppositely located guide surfaces are milled in the cylinder block for said rollers. |
| 5179836 |
Hydraulic system for a differential piston type cylinder |
January 19, 1993 |
| A first cylinder chamber of a hydraulic cylinder is connected to a pair of variable displacement pumps of which the first one is connected to a reservoir and second one is connected to the second cylinder chamber. This allows to bias the piston by a hydraulic force acting on either side |
| 5179330 |
Control circuit for an electrically controlled servo device |
January 12, 1993 |
| A control circuit includes a microprocessor, a table store and an amplifier stage to control a controlled device which has a non-linear or linear, but discontinuous response curve. To obtain a linear response curve of the controlled device the table store is loaded with a response curve |
| 5159812 |
Circuitry for controlling control coils of servo devices in a hydraulic system |
November 3, 1992 |
| The invention refers to a hydraulic system comprising at least a variable displacement pump and at least a consumer. Means are provided to generate electrical limit signals when at least one of the consumers, preferrably a load leading consumer indicates the need for an increased deliver |
