EP1317630A2 - Hydraulic cylinder - Google Patents
Hydraulic cylinderInfo
- Publication number
- EP1317630A2 EP1317630A2 EP01974212A EP01974212A EP1317630A2 EP 1317630 A2 EP1317630 A2 EP 1317630A2 EP 01974212 A EP01974212 A EP 01974212A EP 01974212 A EP01974212 A EP 01974212A EP 1317630 A2 EP1317630 A2 EP 1317630A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- end piece
- piston
- housing
- cylinder
- hydraulic cylinder
- 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.)
- Granted
Links
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
- F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means
-
- 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
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
Definitions
- the invention relates to a hydraulic cylinder, the housing of which is formed from a tubular housing part and a soapy base and an end piece on the head side, with a piston arrangement which is displaceably mounted in the tubular housing part and is guided out of the housing through the end piece on the head side, and with a displacement measuring arrangement , which has a housing-fixed and a piston-fixed element and which emits an electrical signal, - which is a measure of the position of the piston assembly with respect to the housing.
- Such hydraulic cylinders ⁇ are known.
- the electrical output signal of the displacement measuring arrangement of such a cylinder can, for. B. used to display the position of the piston assembly with respect to the housing or supplied as an actual value to a position control loop. Very large forces can be exerted with these cylinders.
- displacement measuring arrangements with the electronic components used in them and the electrical lines connecting them have a sensitive structure. If such a cylinder is used in a harsh environment, e.g. B. used in vehicle technology, there is a risk of damage to the displacement measuring arrangement, especially its evaluation electronics.
- the invention has for its object to provide a hydraulic cylinder of the type mentioned, in which the Components of the evaluation electronics of the displacement measuring arrangement are protected against mechanical damage.
- the outer end face of the bottom end piece can be designed as a flat support surface for the power transmission.
- the space available for accommodating the evaluation electronics can be enlarged if the piston arrangement is adapted to the shape of the housing for accommodating the evaluation electronics in such a way that the piston arrangement encloses a partial region of the bottom end piece protruding into the housing of the cylinder in the end position.
- the arrangement of the tube of the displacement measuring arrangement directly on the bottom end piece makes it possible to easily connect the components arranged within the tube to the evaluation electronics.
- the cylinder 10 is designed as a plunger cylinder. Its housing consists of a bottom end piece 11, a head end piece 12 and a tubular housing part 13 which is held between the end pieces 11 and 12. The end pieces 11 and 12 are fastened to the tubular housing part 13 by screws, of which two screws 14 and 15 are shown in the drawing.
- the piston 17 and the piston rod 18 are made as one piece.
- the piston 17 is guided in the tubular housing part 13.
- a slide ring 20 is arranged between the piston 17 and the tubular housing part 13.
- the piston rod 18 is guided in the end piece 12 on the head side.
- a slide ring 21 and two seals 22 and 23 are arranged between the piston rod 18 and the head-side end piece 12.
- Pressure medium is supplied to the cylinder 10 via a connection bore 26.
- the pressure medium flows from the connection bore 26 via a channel 27 into the space between the tubular housing part 13 and the piston rod 18. From there, the pressure medium passes through the through holes 24 into the space between the bottom side End piece 11 and the piston 17.
- a force acts on the piston arrangement 16 which results from the product of the cross-sectional area of the piston rod 18 and the pressure of the pressure medium.
- the cylinder 10 is provided with a magnetostrictive displacement measuring arrangement known per se.
- the displacement measuring arrangement has a housing-fixed element in the form of a rod 30 and a piston-fixed element in the form of a magnet 31.
- the rod 30 is surrounded by a tube 32, one end of which is held on the floor-end piece 11 and the other, free end of which is closed is.
- the tube 32 dips into a bore 33 of the piston assembly 16.
- Discs 34 and 35 are arranged in the piston rod 18 coaxially with the bore 33.
- the magnet 31 is held in the disk 35.
- the disks 34 and 35 are held in the piston rod 18 by a screw 36.
- the bottom end piece 11 is provided with a cup-shaped recess 39.
- a circuit board 40 is held in the recess 39 of the bottom end piece 11 and is equipped with the components of an electronic evaluation unit 41.
- the rod 30 is also held on the printed circuit board 40.
- the evaluation electronics 41 feeds signals into the rod 30 and evaluates the returning signals.
- the signals supplied to the rod 30 are generated by the magnet 31 corresponding to the position of the piston arrangement 16 with respect to the housing 11 to 13 influenced.
- the evaluation electronics 41 emits an output signal which is a measure of the position of the piston arrangement 16.
- the output signal is advantageously a current signal with a range from 0 to 20 mA or from 4 to 20 mA for the adjustment range of the cylinder.
- the recess 39 is accessible from the outside of the cylinder 10.
- the bottom end piece 11, the tubular housing part 12 and the head end piece are provided with channels 45, 46 and 47 which connect to one another.
- a first sealing ring 43 is arranged in the area in which the channel 45 merges into the channel 46.
- a second sealing ring 44 is arranged in the area in which the channel 46 merges into the channel 47.
- the sealing rings 43 and 44 prevent moisture from getting into the channels 45 to 47 and from there into the recess 39. In tight spaces, surface seals can be used instead of sealing rings.
- Electrical lines 49 lead from the printed circuit board 40 through the channels 45 to 47 into the head-side end piece 12 and exit there through a bushing 50 perpendicular to the direction of movement of the piston arrangement 16. Thus, both the electrical lines and the hydraulic line are connected to the cylinder 10 in the region of the head-end piece 12.
- the bottom end piece 11 projects into the tubular housing part 13 in two partial areas with different large diameters.
- the piston arrangement 16 is provided with a recess 52 in the region of the piston 17.
- the recess ' 52 encloses the piston arrangement 16 in the end position the portion of the bottom end piece 11 which projects into the tubular housing part 13 and faces the piston 17.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10044984 | 2000-09-11 | ||
DE10044984A DE10044984A1 (en) | 2000-09-11 | 2000-09-11 | Hydraulic cylinder |
PCT/EP2001/009781 WO2002020997A2 (en) | 2000-09-11 | 2001-08-24 | Hydraulic cylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1317630A2 true EP1317630A2 (en) | 2003-06-11 |
EP1317630B1 EP1317630B1 (en) | 2007-01-31 |
Family
ID=7655877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01974212A Expired - Lifetime EP1317630B1 (en) | 2000-09-11 | 2001-08-24 | Hydraulic cylinder |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1317630B1 (en) |
DE (2) | DE10044984A1 (en) |
WO (1) | WO2002020997A2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7023199B2 (en) | 2002-12-31 | 2006-04-04 | Caterpillar Inc. | Position sensing cylinder cap for ease of service and assembly |
US7059238B2 (en) * | 2003-10-17 | 2006-06-13 | Clark Equipment Company | Method and apparatus for stroke position sensor for hydraulic cylinder |
US7121185B2 (en) | 2004-05-28 | 2006-10-17 | Caterpillar Inc. | Hydraulic cylinder having a snubbing valve |
DE102004044950B4 (en) * | 2004-07-19 | 2012-05-31 | Bosch Rexroth Aktiengesellschaft | hydraulic cylinders |
US7537022B2 (en) * | 2005-11-09 | 2009-05-26 | Honeywell International Inc. | Valve actuator assembly |
DE202006012815U1 (en) * | 2006-08-17 | 2007-12-20 | Mts Sensor Technologie Gmbh & Co. Kg | travel length |
JP5865876B2 (en) * | 2013-07-31 | 2016-02-17 | Kyb株式会社 | Fluid pressure cylinder |
PT3428461T (en) * | 2017-07-14 | 2021-04-27 | Hydraulique Production Systems | Hydraulic cylinder and installation using at least one such hydraulic cylinder |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH642432A5 (en) * | 1978-05-11 | 1984-04-13 | Rotovolumetric Ag | DEVICE WITH A CYLINDER, A SLIDING PISTON AND A CAPACITIVE TRANSDUCER. |
DE3628278C3 (en) * | 1986-08-20 | 1996-09-26 | Storz E A Kg | Printing cylinder with digital measuring system |
GB8714842D0 (en) * | 1987-06-24 | 1987-07-29 | Russel A | Transducer |
DE3730940A1 (en) * | 1987-09-15 | 1989-03-23 | Herion Werke Kg | Device for indicating the position of the piston of a valve |
DE4306539C2 (en) * | 1993-03-03 | 1995-10-19 | Festo Kg | Arrangement for detecting the position of the piston of a working cylinder |
DE4336918C2 (en) * | 1993-10-29 | 2002-08-01 | Werner Herrmann | Measured value recording system with an assigned evaluation unit for the control of several vertical working cylinders holding a machine bed in the horizontal |
DE29518539U1 (en) * | 1995-11-22 | 1996-01-18 | Festo Kg, 73734 Esslingen | Position detection device |
DE29716805U1 (en) * | 1997-09-18 | 1997-12-18 | Enidine Gmbh | Piston-cylinder arrangement |
-
2000
- 2000-09-11 DE DE10044984A patent/DE10044984A1/en not_active Withdrawn
-
2001
- 2001-08-24 DE DE50111992T patent/DE50111992D1/en not_active Expired - Lifetime
- 2001-08-24 EP EP01974212A patent/EP1317630B1/en not_active Expired - Lifetime
- 2001-08-24 WO PCT/EP2001/009781 patent/WO2002020997A2/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0220997A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE10044984A1 (en) | 2002-03-21 |
WO2002020997A2 (en) | 2002-03-14 |
DE50111992D1 (en) | 2007-03-22 |
WO2002020997A3 (en) | 2002-06-06 |
EP1317630B1 (en) | 2007-01-31 |
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