EP0721067B1 - Druckmittelbetätigte Zylinder-Kolben-Anordnung mit einem Magnetfeldsensor - Google Patents
Druckmittelbetätigte Zylinder-Kolben-Anordnung mit einem Magnetfeldsensor Download PDFInfo
- Publication number
- EP0721067B1 EP0721067B1 EP95120518A EP95120518A EP0721067B1 EP 0721067 B1 EP0721067 B1 EP 0721067B1 EP 95120518 A EP95120518 A EP 95120518A EP 95120518 A EP95120518 A EP 95120518A EP 0721067 B1 EP0721067 B1 EP 0721067B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- permanent magnet
- cylinder
- piston arrangement
- cylinder piston
- magnetic field
- 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
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 39
- 230000004907 flux Effects 0.000 claims abstract description 9
- 239000003302 ferromagnetic material Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000012811 non-conductive material Substances 0.000 claims description 2
- 230000005294 ferromagnetic effect Effects 0.000 abstract description 6
- 239000000696 magnetic material Substances 0.000 abstract 1
- 229910001369 Brass Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
Definitions
- the invention relates to a pressure-operated cylinder-piston arrangement with a permanent magnet on the piston and a magnetic field sensor on the cylinder for querying a path signal, wherein the permanent magnet has a ring shape and is magnetized in the axial direction of the cylinder-piston arrangement, with ring discs made of ferromagnetic material for steering the Magnetic flux.
- a pressure-actuated cylinder-piston arrangement of the above specified genus has become known, for example through DE 35 10 601 A1. It is on the piston rod ring-shaped, axially polarized permanent magnet pushed on. A ring disc made of ferromagnetic material, which also Piston forms, directs the magnetic flux against the cylinder wall. There is a magnetic field sensor on the outside of the cylinder arranged. In this way, the piston releases at one Position by the magnetic field sensor, a signal so that the Piston position is detected.
- the invention is based on the arrangement of the genus specified at the beginning and beats the in the characterizing Features specified in the first claim in front.
- the permanent magnet comes into direct contact Close to the inside wall of the cylinder without touching it.
- the ring disk arranged on one side of the permanent magnet made of ferromagnetic material directs the magnetic Flow along the shortest route against the cylinder. In particular thereby avoiding scattering of the magnetic flux, so that the magnetic flux is confined to a narrow area becomes.
- the outer diameter of the ring disk is made ferromagnetic material is slightly larger than that Outside diameter of the permanent magnet. This will do a suitable one due to the design of the washer or washers Redirection of the flow towards the cylinder wall achieved.
- the axial dimensions of the washer made of ferromagnetic material at most half the size are as the axial dimensions of the permanent magnet. Thereby scatter is largely avoided and the magnetic flux is concentrated.
- the washers can be axially on both sides of the permanent magnet to be ordered. In this case there is a magnetic flux essentially from one ring disc to the other Washer. However, it is better if only one ferromagnetic Washer on one side of the permanent magnet is applied so that only at this point the maximum of Field strength is achieved so that the sensor only this position displays. In special cases, however, it can be recommended be to also use two ferromagnetic washers, whereby then, depending on the arrangement, a somewhat wider area of the Maximum is obtained, or two peaks in the field of ferromagnetic Washers.
- the outside diameter of the permanent magnet slightly smaller than the inside diameter of the cylinder. This ensures that the permanent magnet is not compatible with the Inner wall of the cylinder comes into contact, so that wear on the permanent magnet is prevented. The resulting a somewhat larger distance from the magnetic field sensor does not result Disadvantages because the ferromagnetic ring disk is sufficiently close can reach the inner wall of the cylinder.
- the bushing consists in particular of austenitic steel and is welded into the recess and in a blind hole picks up the sensor. It is clear that in particular If, instead of welding, brazing is also sufficient can be. Through the welded socket and the blind hole the interior of the cylinder is separated from the sensor in the socket. The sensor can be easily replaced. The recess in the cylinder can go inside the cylinder pass. In this case, it is advantageous if the inner end machined the bushing together with the inner surface of the cylinder is. This procedure ensures that despite the used Bush the inner surface of the cylinder completely smooth is, so that no additional stress for the seals arise.
- the invention also proposes that the piston be made of magnetic there is no or little conductive material. With this suggestion should be avoided that the permanent magnet in the piston finds its magnetic return, causing the magnetic field would be reduced in the recess or on the sensor. It was found that low magnetic conductivity for the Material of the piston is at least not disadvantageous.
- the magnetic field sensor is usually fixed to the cylinder.
- the arrangement can also be made such that the magnetic field sensor in a suitable recess along the Cylinder is slidable.
- the job can of the piston in which the magnetic field sensor changes that emits the signal triggered by the permanent magnet of the piston.
- the permanent magnet has relatively small dimensions. So the radial Thickness of the permanent magnet less than a third of the radius of the piston. In particular, it was found that the radial Thickness of the permanent magnet about the sixth part of the radius of the piston to achieve very good results.
- the axial dimensions of the permanent magnet are same as the radial thickness or slightly larger.
- the axial dimensions of the washer or washers Ferromagnetic material are in a preferred embodiment the invention at most half as large as that axial dimensions of the permanent magnet. This ensures one slightly axial expansion of the magnetic field and a corresponding Accuracy of the display by the magnetic field sensor.
- the cylinder-piston arrangement 1 consists essentially of the Cylinder 10, the piston 11 and the piston rod 12.
- the cylinder is closed on one side by the cover 13, which also carries the connecting line 14.
- the piston rod guide 15 is provided is held by the locking ring 16.
- the second hydraulic connection is designated 17.
- a recess 20 is provided in the wall of the cylinder 10, in which the bushing 21 is inserted or welded is.
- This bushing 21 takes the magnetic field sensor in the blind bore 22 2, the connections of which are designated by 23.
- the Magnetic field sensor can be, for example, a reed switch which is housed in a protective tube. It is better however, to provide a magnetic field sensor that in particular has no moving parts and for example on inductive The magnetic field is determined and the corresponding one Emits signal.
- the piston 11 consists essentially of the two parts 18 and 19.
- the parts 18 and 19 are on the threaded pin 30 of the Piston rod 12 held. Due to the two-part training of Piston 11 can be in the annular groove 31 of part 19 of the annular Permanent magnet 3 are inserted.
- the washers 32 and 33 are arranged on both sides of the permanent magnet 3, the washers 32 and 33 are arranged.
- the Permanent magnet 3 is parallel to the central axis 39 of the cylinder-piston arrangement 1 magnetized. For example, the north pole shows towards the piston rod guide 15, the south pole against it towards the cover 13.
- the permanent magnet 3 In the position shown of the piston 11 is the permanent magnet 3 arranged with respect to the recess 20 such that this permanent magnet is located at a point entirely within the Limits of the recess 20 is located, which receives the socket 21. In this way, the magnetic field of the permanent magnet Reach sensor 2 so that a path signal is obtained.
- the Distance "s" indicates approximately how long the switching path is. there it doesn't matter whether the piston is off one or the other in the other direction towards the recess.
- the two washers 32 and 33 can both be made of ferromagnetic Material. Better results or a more precise one However, the signal is received when one of the washers, for example, the washer 32, made of ferromagnetic Material exists while the other washer either is omitted, the width of the annular groove 31 then increasing would decrease, or if this other washer 33 made of aluminum, Brass or a similar material is made. at Such an arrangement will then only open the magnetic field sensor address the position of a ferromagnetic washer 32.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Fluid-Pressure Circuits (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
Claims (10)
- Druckmittelbetätigte Zylinder-Kolben-Anordnung mit einem Permanentmagneten (3) am Kolben (11) und einem Magnetfeldsensor (2) am Zylinder (10) zur Abfrage eines Wegsignales, wobei der Permanentmagnet eine Ringform aufweist und in Achsrichtung der Zylinder-Kolben-Anordnung magnetisiert ist, mit Ringscheiben (32,33) aus ferromagnetischem Material zur Lenkung des Magnetflusses, dadurch gekennzeichnet, daß der Permanentmagnet (3) in einer nach außen offenen Ringnut (31) des Kolbens (11) angeordnet ist, wobei der Außendurchmesser des Permanentmagneten (3) nur geringfügig kleiner ist als der Innendurchmesser des Zylinders (10), daß die Ringnut (31) an einer Seite des Permanentmagneten (3) eine Ringscheibe (32) aus ferromagnetischem Material aufnimmt, deren Innen- und Außendurchmesser im wesentlichen dem Innen- und Außendurchmesser des Permanentmagneten (3) entsprechen, und daß in dem Zylinder (10) eine Ausnehmung (20) für eine Buchse (21) aus magnetisch nicht leitendem Werkstoff angeordnet ist, die den Magnetfeldsensor (2) aufnimmt.
- Zylinder-Kolben-Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Außendurchmesser der Ringscheibe (32) aus ferromagnetischem Material geringfügig größer ist als der Außendurchmesser des Permanentmagneten (3).
- Zylinder-Kolben-Anordnung nach einem oder beiden der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die axialen Abmessungen der Ringscheibe (32) aus ferromagnetischem Material höchstens halb so groß sind als die axialen Abmessungen des Permanentmagneten (3).
- Zylinder-Kolben-Anordnung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß nur auf einer Seite des Permanentmagneten (3) eine Ringscheibe (32) aus ferromagnetischem Material angeordnet ist.
- Zylinder-Kolben-Anordnung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Buchse (21) insbesondere aus austenitischem Stahl besteht und in die Ausnehmung (20) eingeschweißt ist und in einer Sackbohrung (22) den Sensor (2) aufnimmt.
- Zylinder-Kolben-Anordnung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Innenende der Buchse (21) zusammen mit der Innenfläche des Zylinders (10) bearbeitet ist.
- Zylinder-Kolben-Anordnung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kolben (11) aus magnetisch nicht oder wenig leitendem Werkstoff besteht.
- Zylinder-Kolben-Anordnung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Magnetfeldsensor (2) in Achsrichtung der Zylinder-Kolben-Anordnung (1) verschiebbar ist.
- Zylinder-Kolben-Anordnung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die radiale Dicke des Permanentmagneten (3) kleiner ist als ein Drittel des Radius des Kolbens (11).
- Zylinder-Kolben-Anordnung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die radiale Dicke des Permanentmagneten (3) etwa dem sechsten Teil des Radius des Kolbens (11) entspricht.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19500137A DE19500137A1 (de) | 1995-01-04 | 1995-01-04 | Druckmittelbetätigte Zylinder-Kolben-Anordnung mit einem Magnetfeldsensor |
DE19500137 | 1995-01-04 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0721067A2 EP0721067A2 (de) | 1996-07-10 |
EP0721067A3 EP0721067A3 (de) | 1998-02-11 |
EP0721067B1 true EP0721067B1 (de) | 2002-08-28 |
Family
ID=7750997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95120518A Expired - Lifetime EP0721067B1 (de) | 1995-01-04 | 1995-12-23 | Druckmittelbetätigte Zylinder-Kolben-Anordnung mit einem Magnetfeldsensor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0721067B1 (de) |
AT (1) | ATE223002T1 (de) |
DE (2) | DE19500137A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29607993U1 (de) * | 1996-05-03 | 1996-08-01 | Festo Kg, 73734 Esslingen | Kolben für einen Arbeitszylinder |
DE19637296A1 (de) * | 1996-09-13 | 1998-03-19 | Wabco Gmbh | Kolben/Zylinder-Anordnung |
DE19712829B4 (de) * | 1997-03-26 | 2005-02-17 | Sick Ag | Vorrichtung zur Erkennung der Position eines beweglichen Gegenstandes |
DE19752671B4 (de) * | 1997-11-28 | 2006-11-23 | Ludwig Ehrhardt Gmbh | Blockzylinder zur Aufnahme und Führung von Werkzeugen auf einer Werkzeugmaschine oder auf einem Arbeitstisch |
DE19756639A1 (de) | 1997-12-19 | 1999-06-24 | Zahnradfabrik Friedrichshafen | Schalteinrichtung |
DE19756637A1 (de) * | 1997-12-19 | 1999-06-24 | Zahnradfabrik Friedrichshafen | Schalteinrichtung |
DE10053995A1 (de) | 2000-10-31 | 2002-05-08 | Continental Teves Ag & Co Ohg | In einen Hauptzylinder integrierter Signalgeber mit Hall-Sensor |
DE10304551A1 (de) * | 2003-02-04 | 2004-08-12 | Mann + Hummel Gmbh | Stellelement mit Lageerkennung |
DE10310428A1 (de) * | 2003-03-11 | 2004-09-30 | Hydac Technology Gmbh | Kolbenspeicher |
DE102005030722A1 (de) * | 2005-07-01 | 2007-01-04 | Bosch Rexroth Teknik Ab | Druckmittelzylinder |
CN102943784B (zh) * | 2012-11-19 | 2015-06-10 | 湖南特力液压有限公司 | 缸筒、液压缸及包含该液压缸的泵送设备 |
DE202013010056U1 (de) * | 2013-11-07 | 2015-02-10 | Bümach Engineering International B.V. | Arbeitszylinder |
DE102016210002A1 (de) * | 2016-06-07 | 2017-12-07 | Zf Friedrichshafen Ag | Getriebe mit einer Schalteinheit |
CN109162996B (zh) * | 2018-11-06 | 2024-06-14 | 江苏中天科技电缆附件有限公司 | 深孔内壁应变片的粘贴装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8209420U1 (de) * | 1982-04-02 | 1983-09-15 | Robert Bosch Gmbh, 7000 Stuttgart | Kolben fuer beruehrungslose abtastung der kolbenstellung |
DE3510601A1 (de) * | 1985-03-23 | 1986-09-25 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | Kolbeneinheit fuer einen arbeitszylinder mit einer einrichtung zum erfassen der kolbenposition |
CH674058A5 (de) * | 1986-10-22 | 1990-04-30 | Festo Kg | |
JPS63122902A (ja) * | 1986-11-13 | 1988-05-26 | Ckd Controls Ltd | 移動体の位置確認装置 |
DE9010114U1 (de) * | 1990-07-03 | 1990-09-06 | Festo KG, 7300 Esslingen | Arbeitszylinder |
DE4122481C2 (de) * | 1991-07-06 | 1995-08-31 | Kuhnke Gmbh Kg H | Kolben-Zylinder-Anordnung |
DE9305640U1 (de) * | 1993-04-15 | 1994-08-25 | Hydraulik Techniek, Emmen | Druckmittelbetätigter Arbeitszylinder |
-
1995
- 1995-01-04 DE DE19500137A patent/DE19500137A1/de not_active Withdrawn
- 1995-12-23 DE DE59510348T patent/DE59510348D1/de not_active Expired - Fee Related
- 1995-12-23 EP EP95120518A patent/EP0721067B1/de not_active Expired - Lifetime
- 1995-12-23 AT AT95120518T patent/ATE223002T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0721067A3 (de) | 1998-02-11 |
ATE223002T1 (de) | 2002-09-15 |
DE59510348D1 (de) | 2002-10-02 |
DE19500137A1 (de) | 1996-07-11 |
EP0721067A2 (de) | 1996-07-10 |
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