EP0898085B1 - Druckmittelmotor für elektrorheologische Flüssigkeiten - Google Patents
Druckmittelmotor für elektrorheologische Flüssigkeiten Download PDFInfo
- Publication number
- EP0898085B1 EP0898085B1 EP98114617A EP98114617A EP0898085B1 EP 0898085 B1 EP0898085 B1 EP 0898085B1 EP 98114617 A EP98114617 A EP 98114617A EP 98114617 A EP98114617 A EP 98114617A EP 0898085 B1 EP0898085 B1 EP 0898085B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- valves
- pressurized
- fluid motor
- electrorheological
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/06—Use of special fluids, e.g. liquid metal; Special adaptations of fluid-pressure systems, or control of elements therefor, to the use of such fluids
- F15B21/065—Use of electro- or magnetosensitive fluids, e.g. electrorheological fluid
Definitions
- the invention relates to a pressure medium motor for electrorheological fluids, with a housing surrounding two working chambers, a piston movable in the housing, which separates the working chambers from each other, an inlet channel for the supply of an electrorheological fluid from a space of higher pressure, an outlet channel for the discharge of electrorheological Liquid in a space of low pressure and electrorheological valves with a respective one working chamber with the inlet channel or the outlet channel connecting annular gap whose boundary surfaces form electrodes for generating an electric field.
- Electrorheological fluids also known as electroviscous liquids, change their viscosity as a function of the field strength of an electric field to which they are exposed. Under the effect of an electric field, electrorheological fluids become tough or even stiff. It is known to use electrorheological fluids as working fluid in hydraulic systems in order to be able to electrically control hydraulic processes directly by means of electrorheological valves.
- a pressure medium motor embodied as a differential cylinder which serves as a servomotor is intended for aircraft and is operated with an electrorheological fluid.
- Control is provided by electrorheological valves integrated in the cylinder.
- the four valves are designed as annular gaps, which are formed by the insertion of two pipes in the cylinder.
- the piston of the cylinder is passed through the inner tube.
- the supply and discharge of the electrorheological fluid via nozzles, which are arranged in the middle between the two end faces of the cylinder in the cylinder wall. Due to the short connection between the valves and the cylinder chambers, the high response speed of the electrorheological fluid can be well utilized in this known embodiment.
- the invention is based on the object, a pressure medium engine of the type mentioned with integrated valves to create the compact outer dimensions, a high differential pressure between the two working chambers and thus a relatively large actuating force that achieves high dynamics and in which a good heat dissipation is given by direct metallic heat conduction.
- the object is achieved in that the electrorheological valves through the housing wall in the longitudinal direction penetrating holes and in the holes arranged, insulated from the housing elements are formed, the holes and the elements together annular gaps constant gap width and limit the elements to a high voltage and the housing can be applied to ground potential.
- the electrode gaps of the electrorheological valves can be guided over the entire length of the housing, so that one, measured on the length of the pressure medium motor, high pressure difference can be achieved. All annular gaps are in direct contact with the housing wall that can be produced from a metal, which ensures good heat dissipation.
- Each valve can be formed by several holes with high voltage elements. It is therefore a large cross-sectional area of the valves and thus a high volume flow and high dynamics of the pressure medium motor can be achieved.
- the inventive design of the pressure medium motor also allows a mechanically simple structure with identical components, namely holes and elements of the same size, to form the four valves.
- the elements may in a simple embodiment consist of cylindrical rods or spikes, but they may also have the shape of a coil extending along the bore.
- the elements can be mounted, with their ends protruding from the bores, in end caps which are fastened to the end faces of the housing and made of highly insulating material, e.g. engineering thermoplastics such as PPS or ceramics.
- the end caps may further form chambers through which the annular gaps of the valves are connected to the inlet channel and the outlet channel or a working chamber. This has the advantage that the entire annular gap cross section is available as an inlet cross section.
- the four valves may be connected to the working chambers and the inlet channel and the outlet channel in two different ways via the chambers in the end caps.
- the inlet channel and the outlet channel lie on one end side of the housing and the valves are connected via the other end face of the housing with the working chambers.
- This embodiment has the advantage that a unit of motor, pump and tank or memory can be flanged to the one end face of the pressure medium motor, resulting in a very compact overall mechanical structure of an aggregate, for example, in industrial robots for accurate positioning or as power steering for Passenger or truck can be used. Since the electrorheological fluid has a very high response speed of usually 1 ms, such an aggregate can also be used as a high-frequency cylinder in material testing.
- the inlet channel and the outlet channel are guided to chambers on both end sides of the housing and connected there in each case with the annular gaps of another valve. This results in very short connection paths to the respective working chamber at all four valves.
- FIG. 1 illustrates the mode of operation of the pressure medium motor operating in the following with an electrorheological fluid.
- the lines denote the flow channels through which the electrorheological working fluid from a pump P is conveyed to a non-pressurized container T. Between the pump P and the tank T there are two parallel flow channels.
- the upper channel contains in series one behind the other the annular gap valves 1a and 2b illustrated by circular surfaces, the lower flow channel the annular gap valves 2a and 1b, viewed in the flow direction. Between the annular gap valves 1a, 2b is at the upper flow channel connected to a working chamber A of the pressure medium motor, between the annular gap valves 2a, 1b, the other working chamber B of the pressure medium motor is connected to the lower flow channel.
- the annular gap valves 1a, 1b are blocked by applying a high voltage, i. by the electric field generated by the high voltage in the annular gap, the viscosity of the electrorheological working fluid within the annular gap is increased so much that against the flow resistance caused thereby only a fraction of the delivered amount of liquid can pass through the annular gap valves 1a, 1b.
- the pressure at the pump outlet and in the annular gap valve 2a switched to passageway increases with the working chamber B connected to this passage.
- the pressure in the working chamber A remains at the low level of the container T, since the valve 2b is also on passage. Due to the pressure difference between the working chamber B and the working chamber A, the piston is moved in the direction of the working chamber A.
- the annular gap valves 2a, 2b are blocked by applying a high voltage and the annular gap valves 1a, 1b de-energized and thus switched to passage. If the valves are switched quickly back and forth, the piston can be set to a vibration corresponding to the switching frequency.
- the pressure medium motor shown in Figures 2 to 6 has a cylindrical housing 1, which consists of metal.
- the housing 1 has a central, continuous cylinder bore 2, in which a piston 3 with a piston rod 4 is guided axially movable.
- the piston 3 is with a Sliding seal 5 sealed against the wall of the cylinder bore 2 and divides the cylinder bore 2 into two working chambers A, B.
- a series of cylindrical bores 6 are provided parallel to the cylinder bore 2, which completely penetrate the housing 1 and have a uniform diameter .
- Through the holes 6 extend cylindrical mandrels 7 made of metal, which have a smaller diameter than the holes 6 and are centered with respect to the holes.
- end caps 9, 10 which are mounted pressure-tight on both end sides of the housing 1.
- the end caps 9, 10 are made of an insulating material, such as PPS or polycarbonate, which may be reinforced with fillers, such as glass fibers.
- the end caps 9, 10 on a cylindrical projection 11 which engages in each case into the end of the cylinder bore 2 and closes it.
- the end caps 9, 10 are provided with central through holes 12 in which the piston rod 4 is guided and sealed.
- the end caps 9, 10 each have on their side facing the housing 1 two semi-cylindrical chambers 13, 14 and 15, 16 which are separated from one another by a radial wall 17 and 18, respectively.
- the walls 17, 18 are aligned with each other so that their center plane are perpendicular to each other.
- Each of the four groups of annular gaps forms an electrorheological annular gap valve 1a, 1b, 2a, 2b.
- the mandrels 7 of each annular gap valve are connected to one another in the end cap 9 by a high-voltage distributor 19 and can be connected to a high-voltage source independently of the spikes of the other annular gap valves.
- the housing 1 is connected to ground potential. If high voltage is applied to the spikes 7 of an annular gap valve, an electric field is generated in the annular gaps 8 of this annular gap valve and the viscosity of the electrorheological working fluid in the annular gaps 8 of this valve is increased.
- the chamber 16 is connected via a channel 20 in the housing 1 with the working chamber A and the chamber 15 via a channel 21 in the housing 1 with the working chamber B.
- the chamber 14 is connected to the inlet channel 22 and the chamber 13 to the outlet channel 23.
- the working fluid supplied via the inlet channel 22 of the chamber 14 can thus enter the chamber 16 either via the annular gap valve 1a or into the chamber 15 via the annular gap valve 2a. Accordingly, the working fluid from the chamber 16 via the annular gap valve 2b and from the chamber 15 via the annular gap valve 1b respectively in the chamber 13 and from there in the outlet channel 23 are discharged.
- the invention described is equally suitable for pressure medium motors that work with a magnetorheological working fluid. Instead of an electric field, a magnetic field is then to be built up in the annular gaps with the aid of suitable coils.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
- Servomotors (AREA)
- Fluid-Damping Devices (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19735466 | 1997-08-16 | ||
DE19735466A DE19735466B4 (de) | 1997-08-16 | 1997-08-16 | Druckmittelmotor für elektrorheologische Flüssigkeiten |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0898085A2 EP0898085A2 (de) | 1999-02-24 |
EP0898085A3 EP0898085A3 (de) | 2000-01-19 |
EP0898085B1 true EP0898085B1 (de) | 2006-05-10 |
Family
ID=7839107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98114617A Expired - Lifetime EP0898085B1 (de) | 1997-08-16 | 1998-08-04 | Druckmittelmotor für elektrorheologische Flüssigkeiten |
Country Status (5)
Country | Link |
---|---|
US (1) | US6116144A (ja) |
EP (1) | EP0898085B1 (ja) |
JP (1) | JPH11125215A (ja) |
KR (1) | KR19990023619A (ja) |
DE (2) | DE19735466B4 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19717693A1 (de) * | 1997-04-26 | 1998-10-29 | Schenck Ag Carl | Stell- und Dämpfervorrichtung |
DE19955959A1 (de) * | 1999-11-19 | 2001-05-23 | Schenck Pegasus Gmbh | Druckmittelmotor auf Basis elektrorheologischer Flüssigkeiten |
US6823895B2 (en) * | 2001-05-31 | 2004-11-30 | The Board Of Regents Of The University And Community College System Of Nevada On Behalf Of The University Of Nevada | Magnetorheological fluid device |
DE102004010532A1 (de) * | 2004-03-04 | 2005-12-15 | Fludicon Gmbh | Ventilansteuerung von hydraulischen Aktoren auf Basis elektrorheologischer Flüssigkeiten |
DE102004026454B4 (de) * | 2004-05-29 | 2007-10-25 | Bundesrepublik Deutschland, vertreten durch das Bundesministerium der Verteidigung, dieses vertreten durch das Bundesamt für Wehrtechnik und Beschaffung | Schwimmende Rohrlagerung |
DE102010001595B4 (de) * | 2010-02-04 | 2012-05-16 | Sumitomo (Shi) Demag Plastics Machinery Gmbh | Spritzgießmaschine sowie hydraulische Antriebseinheit hierfür |
RU2634166C2 (ru) * | 2014-08-18 | 2017-10-24 | Катарина Валерьевна Найгерт | Магнитореологический привод прямого электромагнитного управления характеристиками потока верхнего контура гидравлической системы с гидравлическим мостиком (варианты) |
CN106438565B (zh) * | 2016-12-08 | 2018-02-02 | 广东技术师范学院 | 一种防尘控热装置及其方法 |
DE102017214660B4 (de) * | 2017-08-22 | 2022-12-15 | Bayerische Motoren Werke Aktiengesellschaft | Druckbolzen einer Presse sowie Presse mit Druckbolzen |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3050034A (en) * | 1960-04-04 | 1962-08-21 | Ct Circuits Inc | Transducer-controlled servomechanism |
US3501099A (en) * | 1967-09-27 | 1970-03-17 | Physics Int Co | Electromechanical actuator having an active element of electroexpansive material |
US3552275A (en) * | 1968-07-29 | 1971-01-05 | Boeing Co | Electric fluid actuator |
US3587613A (en) * | 1969-07-18 | 1971-06-28 | Atomic Energy Commission | Electro-fluid valve having strip electrodes |
US3599428A (en) * | 1970-04-29 | 1971-08-17 | Boeing Co | Electric fluid actuator |
DE3063743D1 (en) * | 1979-05-15 | 1983-07-21 | Secr Defence Brit | A hydraulic servo valve arrangement |
JP2599602B2 (ja) * | 1987-11-02 | 1997-04-09 | 株式会社ブリヂストン | 起振装置 |
DE3738630C2 (de) * | 1987-11-13 | 1995-06-08 | Rexroth Mannesmann Gmbh | Elektrohydraulische Druckwandlervorrichtung |
US4840112A (en) * | 1988-01-12 | 1989-06-20 | Ga Technologies Inc. | Combined valve/cylinder using electro-rheological fluid |
US5014829A (en) * | 1989-04-18 | 1991-05-14 | Hare Sr Nicholas S | Electro-rheological shock absorber |
US5161653A (en) * | 1989-04-18 | 1992-11-10 | Hare Sr Nicholas S | Electro-rheological shock absorber |
US5158109A (en) * | 1989-04-18 | 1992-10-27 | Hare Sr Nicholas S | Electro-rheological valve |
GB2244006B (en) * | 1990-05-04 | 1994-05-25 | Blatchford & Sons Ltd | An artificial limb |
US5170866A (en) * | 1991-04-01 | 1992-12-15 | Motorola, Inc | Motion-damping device using electrorheological fluid |
USH1292H (en) * | 1992-09-23 | 1994-03-01 | The United States Of America As Represented By The Secretary Of The Navy | Electro-rheological fluid damped actuator |
US5866971A (en) * | 1993-09-09 | 1999-02-02 | Active Control Experts, Inc. | Hybrid motor |
GB2285494B (en) * | 1994-01-05 | 1998-04-22 | Ckd Corp | Control apparatus for an electroviscous fluid |
-
1997
- 1997-08-16 DE DE19735466A patent/DE19735466B4/de not_active Expired - Fee Related
-
1998
- 1998-08-04 EP EP98114617A patent/EP0898085B1/de not_active Expired - Lifetime
- 1998-08-04 DE DE59813531T patent/DE59813531D1/de not_active Expired - Lifetime
- 1998-08-11 US US09/132,609 patent/US6116144A/en not_active Expired - Fee Related
- 1998-08-11 JP JP10237973A patent/JPH11125215A/ja active Pending
- 1998-08-14 KR KR1019980033111A patent/KR19990023619A/ko not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
EP0898085A3 (de) | 2000-01-19 |
DE19735466A1 (de) | 1999-02-18 |
US6116144A (en) | 2000-09-12 |
EP0898085A2 (de) | 1999-02-24 |
KR19990023619A (ko) | 1999-03-25 |
JPH11125215A (ja) | 1999-05-11 |
DE19735466B4 (de) | 2007-06-28 |
DE59813531D1 (de) | 2006-06-14 |
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