EP1317630A2 - Cylindre hydraulique - Google Patents

Cylindre hydraulique

Info

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
Application number
EP01974212A
Other languages
German (de)
English (en)
Other versions
EP1317630B1 (fr
Inventor
Werner Ebel
Wilfried KÜBERT
Martin Laube
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Rexroth AG
Original Assignee
Bosch Rexroth AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bosch Rexroth AG filed Critical Bosch Rexroth AG
Publication of EP1317630A2 publication Critical patent/EP1317630A2/fr
Application granted granted Critical
Publication of EP1317630B1 publication Critical patent/EP1317630B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

L'invention concerne un cylindre hydraulique, dont le logement comporte une partie tubulaire ainsi qu'une pièce d'extrémité côté fond et une autre côté tête. Ledit cylindre comprend un ensemble piston logé étanche dans ce logement, ledit ensemble faisant saillie du logement par la pièce d'extrémité côté tête. Ce cylindre est équipé d'un ensemble de mesure de déplacement qui présente un élément fixé au logement, un élément fixé au piston et émet un signal électrique représentant une mesure de la position de l'ensemble piston par rapport au logement. Lors de l'utilisation d'un cylindre de ce type en conditions de service sévères, des composants de l'ensemble de mesure de déplacement, en particulier des circuits électriques, risquent d'être endommagés. Afin d'éviter tout risque d'endommagement, une électronique d'évaluation, en liaison avec un élément de l'ensemble de mesure de déplacement, est logée dans un évidement en forme de pot de la pièce d'extrémité côté fond du logement. Les cylindres selon cette invention conviennent particulièrement à des applications en conditions de service sévères, comme p. ex. en technique automobile.
EP01974212A 2000-09-11 2001-08-24 Cylindre hydraulique Expired - Lifetime EP1317630B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10044984A DE10044984A1 (de) 2000-09-11 2000-09-11 Hydraulischer Zylinder
DE10044984 2000-09-11
PCT/EP2001/009781 WO2002020997A2 (fr) 2000-09-11 2001-08-24 Cylindre hydraulique

Publications (2)

Publication Number Publication Date
EP1317630A2 true EP1317630A2 (fr) 2003-06-11
EP1317630B1 EP1317630B1 (fr) 2007-01-31

Family

ID=7655877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01974212A Expired - Lifetime EP1317630B1 (fr) 2000-09-11 2001-08-24 Cylindre hydraulique

Country Status (3)

Country Link
EP (1) EP1317630B1 (fr)
DE (2) DE10044984A1 (fr)
WO (1) WO2002020997A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
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 (de) * 2004-07-19 2012-05-31 Bosch Rexroth Aktiengesellschaft Hydrozylinder
US7537022B2 (en) * 2005-11-09 2009-05-26 Honeywell International Inc. Valve actuator assembly
DE202006012815U1 (de) * 2006-08-17 2007-12-20 Mts Sensor Technologie Gmbh & Co. Kg Weglängensensor
JP5865876B2 (ja) * 2013-07-31 2016-02-17 Ｋｙｂ株式会社 流体圧シリンダ
EP3428461B1 (fr) * 2017-07-14 2021-01-20 Hydraulique Production Systems Verin hydraulique et installation mettant en oeuvre au moins un tel verin hydraulique

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH642432A5 (de) * 1978-05-11 1984-04-13 Rotovolumetric Ag Einrichtung mit einem zylinder, einem in diesem verschiebbaren kolben und einem kapazitiven messwandler.
DE3628278C3 (de) * 1986-08-20 1996-09-26 Storz E A Kg Druckzylinder mit digitalem Wegmeßsystem
GB8714842D0 (en) * 1987-06-24 1987-07-29 Russel A Transducer
DE3730940A1 (de) * 1987-09-15 1989-03-23 Herion Werke Kg Vorrichtung zur anzeige der stellung des kolbens eines ventils
DE4306539C2 (de) * 1993-03-03 1995-10-19 Festo Kg Anordnung zur Erfassung der Position des Kolbens eines Arbeitszylinders
DE4336918C2 (de) * 1993-10-29 2002-08-01 Werner Herrmann Meßwerterfassungssystem mit einer zugeordneten Auswerteeinheit zur Ansteuerung mehrerer senkrechter, ein Maschinenbett in der Waagerechten haltenden Arbeitszylinder
DE29518539U1 (de) * 1995-11-22 1996-01-18 Festo Kg, 73734 Esslingen Positionserfassungsvorrichtung
DE29716805U1 (de) * 1997-09-18 1997-12-18 Enidine Gmbh Kolben-Zylinder-Anordnung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0220997A2 *

Also Published As

Publication number Publication date
DE10044984A1 (de) 2002-03-21
DE50111992D1 (de) 2007-03-22
WO2002020997A3 (fr) 2002-06-06
EP1317630B1 (fr) 2007-01-31
WO2002020997A2 (fr) 2002-03-14

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