EP0965765A2 - Vérin - Google Patents

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Publication number
EP0965765A2
EP0965765A2 EP99890192A EP99890192A EP0965765A2 EP 0965765 A2 EP0965765 A2 EP 0965765A2 EP 99890192 A EP99890192 A EP 99890192A EP 99890192 A EP99890192 A EP 99890192A EP 0965765 A2 EP0965765 A2 EP 0965765A2
Authority
EP
European Patent Office
Prior art keywords
contact
cylinder
piston
fixed contact
electrically
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.)
Withdrawn
Application number
EP99890192A
Other languages
German (de)
English (en)
Other versions
EP0965765A3 (fr
Inventor
Gisela Schleich
Toni Hollerbach
Jürgen Osterried
Gernot Techet
Michael Knapp
Harald Schauer
Klaus Stolle
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.)
Hoerbiger Hydraulik GmbH
Original Assignee
Hoerbiger Hydraulik GmbH
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 Hoerbiger Hydraulik GmbH filed Critical Hoerbiger Hydraulik GmbH
Publication of EP0965765A2 publication Critical patent/EP0965765A2/fr
Publication of EP0965765A3 publication Critical patent/EP0965765A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the invention relates to a working cylinder, in particular for pivotable Flaps on vehicles or vehicle tops, with a pressure-operated, piston displaceable in a cylinder tube and at least a pair of electrical contacts that are in a defined position of the Open or open the piston in the cylinder tube, preferably one of the end positions close and thus produce a signal about the position of the piston, one of these contacts from the piston or an associated actuating section preferably essentially radial to the axis of the cylinder tube against the action of an elastic biasing element and relative to other, fixed contact is displaceable as soon as the piston in the defined position.
  • hydraulic automatic Control hoods or automatic trunk lid or engine compartment covers are currently microswitches or rotary angle sensors, Hall sensors, etc. in the hood installed. This increases the effort for assembly and Attitude. So integrating a simple switch into one would be existing system, for example directly in connection with the already required Working cylinders significantly cheaper.
  • limit switches are known from EP 0 448 906 A2 which an actuating section connected to the piston has an actuating pin shifts radially to the longitudinal axis of the cylinder tube and thus indirectly a contact of one located outside the cylinder tube Switch operated to generate a limit signal.
  • This construction has the disadvantage, however, that that which transfers the movement to the contact Element must be movable but must be sealed against high pressures, which is very complex and yet very prone to failure.
  • the switches arranged outside the cylinder tube have a relatively large amount of space, when used for, for example, vehicle tops or actuation arrangements is usually not available for pivotable flaps on vehicles.
  • the switches or cylinders are allowed in the conventional solutions only be installed in certain positions, otherwise there is dirt in the pressure medium this dirt is deposited around the insulated contact and a short circuit can cause. This enables faulty switching, which, especially in the Interaction with other working cylinders, to damage the system being able to lead. Also, the switch can often only be installed opposite the Cylinder connection bore.
  • the object of the present invention is therefore to create one preferably for use in vehicle roof systems or pivotable flaps on vehicles with suitable working cylinders at least a switch for the detection of at least one position of the piston in the Cylinder, which working cylinder with a simple, flexible construction and little elaborate production avoids the disadvantages of the known designs and the safe and trouble-free position control without sealing problems allowed.
  • the fixed contact with the cylinder is advantageously electrical conductively connected so that it can serve electrically as a ground and further connections can be avoided.
  • the Slidable contact electrically conductive via the elastic biasing element connected to the outside electrical line, against the piston or whose actuating section is electrically insulated and in its from fixed contact separate position also against the cylinder electrically is isolated.
  • the elastic pretensioning element ensures reliable switching behavior by clearly defining the force for the switching process.
  • The also allows the contact surfaces to be coated with more conductive materials can be to an even lower volume resistance to reach.
  • a bore preferably a threaded bore
  • the two interacting contacts in a preferably helical, insertable into the said threaded hole and the cylinder tight closing housing are included, from which only the electrical Cable is led out isolated from the housing.
  • the housing is advantageously electrically conductive, preferably by direct contact, connected to the cylinder, is the fixed one Contact with the housing electrically connected and is the sliding Contact in its position separate from the fixed contact the housing is electrically insulated. So with a simple structure with less Number of components ensures the safe function of the switch.
  • the housing with the Cylinder and / or the fixed contact by direct contact electrically is conductively connected, the construction and assembly can continue be simplified.
  • the piston or its actuating section by means of an actuator passed through the central opening of the socket made of electrically non-conductive material on the sliding contact acts.
  • this ensures good electrical contact through large areas Touching the two contacts as well as an accurate and quick one Switch with the slightest relative movements of the two contacts to each other ensured.
  • the actuating element can rest in the socket and the penetration of dirt or other impurities prevent between the contacts, so that even when the print medium is dirty and maintain the function of the switch safely in all installation positions remains.
  • a further increase in the accuracy of the switching is then given if a contact pin starts from the disc-shaped sliding contact protrudes into the central opening of the socket and not electrically conductive material of the actuator against the fixed contact is isolated. This is a safe guide and exactly in any case the position of the contact surfaces oriented orientation of the contacts to each other guaranteed.
  • a simple, yet functionally reliable structure with clear definability of the switching behavior is given when the sliding contact over an electrically conductive elastic element, preferably a coil spring, is electrically conductively connected to the line leading to the outside.
  • an electrically conductive elastic element preferably a coil spring
  • FIG. 1 shows a longitudinal section through a working cylinder according to the invention with two limit switches and Fig. 2nd FIG. 1 is an enlarged detail view of area B of FIG. 1.
  • a piston 4 is slidably guided between the bottom 2 and the cover 3.
  • the displacement of the piston 4 and thus the extension or retraction of the the piston 4 connected piston rod 5 is preferably on the pressure medium a hydraulic oil, which causes suitable controls and lines the bottom 2 or the cover 3, through which the piston rod 5 is passed sealed, is supplied.
  • the switch 6 and its installation area is enlarged Scale shown.
  • the advantageous embodiment is clearly too recognize in which the switch 6 from a inserted in a threaded bore 9, helical housing 10 with the electrical internals.
  • the extension 7 on the piston 4 moves one when the end position is reached Pin 11 made of insulating material radially from the axis of the cylinder tube 1 after outside, which pin 11 has a contact pin 12 of a first, displaceable Contact 13, preferably in the form of a disc, surrounds.
  • the pin 11 made of insulating material insulates the contact pin 12 electrically against the preferably socket-shaped fixed contact 14, which is fixed in Housing 10 is held.
  • the pin 11 fills the central opening of the socket-shaped, stationary contact 14 completely and thus prevents the penetration of dirt and contaminants between the contacts 13 and 14.
  • This sealing and protective function works in every position of the switch 6 and each position of the working cylinder A, so that their use has no restrictions is more subject to and the proper functioning also already contaminated hydraulic oil is ensured.
  • the disc-shaped contact 13 on the end face of the contact 14 and on thus keeps the electrical circuit closed.
  • the sliding contact 13 is by a coil spring 15 or a similar elastic element biased against the contact 14, the spring 15 between the contact 13 and one from the housing 10 and thus the working cylinder A to the outside guided electrical connector 16 for an electrical line to Control electronics is clamped.
  • This connector 16 as well Contact 13 in its position raised from contact 14 are indicated by the Insulation 17 against the housing 10 and thus the electrically acting as a mass Working cylinder A insulated.
  • the housing 10 could also be glued, inserted and by a kind Bayonet lock or held by a union nut or on functional similar way in the bottom 2, the lid 3 or for the Determination of intermediate positions also used in the cylinder tube 1 itself be.
  • connectors 16 for connection with plug-on or otherwise connectable lines could also be the line itself in the Working cylinder A or the housing 10 used and insulated from the outside be led.
  • the switch 6 according to the invention can also be used with corresponding Requirements on the working cylinder A itself and when installing it like this be arranged that the movement of the sliding contact 13 is not accurate radially but at an acute angle to the longitudinal axis of the cylinder tube 1, if need be, even parallel to this longitudinal axis, in which case one greater freedom for the arrangement of the supply and discharge lines for the pressure medium given is.
  • the latter coaxial arrangement of the switch 6 and the cylinder tube 1 is usually only possible at the bottom 2 of the working cylinder A. be.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP99890192A 1998-06-18 1999-06-16 Vérin Withdrawn EP0965765A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT104598A AT407283B (de) 1998-06-18 1998-06-18 Arbeitszylinder
AT104598 1998-06-18

Publications (2)

Publication Number Publication Date
EP0965765A2 true EP0965765A2 (fr) 1999-12-22
EP0965765A3 EP0965765A3 (fr) 2002-01-16

Family

ID=3505397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99890192A Withdrawn EP0965765A3 (fr) 1998-06-18 1999-06-16 Vérin

Country Status (2)

Country Link
EP (1) EP0965765A3 (fr)
AT (1) AT407283B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118519A1 (de) 2011-11-15 2013-05-16 Festo Ag & Co. Kg Fluidbetätigter Linearantrieb
EP2878831A1 (fr) * 2013-11-07 2015-06-03 Bümach Engineering International B.V. Cylindre de travail
DE202020002427U1 (de) 2020-06-02 2021-09-03 Bümach Engineering lnternational B.V. Arbeitszylinder und Positionsgeber
DE102021112746A1 (de) 2021-05-17 2022-11-17 Hans E. Winkelmann, Gesellschaft mit beschränkter Haftung Zylinder, Verwendung eines Zylinders

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207565A (en) * 1978-06-12 1980-06-10 Midland-Ross Corporation Piston overtravel indicator
EP0448906A2 (fr) * 1990-03-14 1991-10-02 Tc/American Monorail, Inc. Intensificateur de pression
DE4312248C1 (de) * 1993-04-15 1994-06-30 Weber Hydraulik Gmbh Elektrischer Kontaktschalter für Hydraulikzylinder

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316145A (en) * 1976-10-01 1982-02-16 Electro-Mechanical Products Fluid pressure actuator with proximity position sensor
US4385297A (en) * 1980-01-14 1983-05-24 Schmitt Wilhelm E Arrangement for sensing proximity of a reciprocating member
DE3525029C2 (de) * 1984-12-22 1995-08-31 Festo Kg Kolben-Zylinder-Anordnung
US4681992A (en) * 1986-03-06 1987-07-21 C. M. Smillie & Company Cushioned clamp cylinder with proximity switches
US4756229A (en) * 1986-09-25 1988-07-12 United Technologies Corporation Digital motor feedback for a position actuator
JPH01170801A (ja) * 1987-12-25 1989-07-05 Ckd Corp 流体圧シリンダのピストン位置検出装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207565A (en) * 1978-06-12 1980-06-10 Midland-Ross Corporation Piston overtravel indicator
EP0448906A2 (fr) * 1990-03-14 1991-10-02 Tc/American Monorail, Inc. Intensificateur de pression
DE4312248C1 (de) * 1993-04-15 1994-06-30 Weber Hydraulik Gmbh Elektrischer Kontaktschalter für Hydraulikzylinder

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118519A1 (de) 2011-11-15 2013-05-16 Festo Ag & Co. Kg Fluidbetätigter Linearantrieb
DE102011118519B4 (de) 2011-11-15 2019-10-17 Festo Ag & Co. Kg Fluidbetätigter Linearantrieb
EP2878831A1 (fr) * 2013-11-07 2015-06-03 Bümach Engineering International B.V. Cylindre de travail
DE202020002427U1 (de) 2020-06-02 2021-09-03 Bümach Engineering lnternational B.V. Arbeitszylinder und Positionsgeber
DE102021002734A1 (de) 2020-06-02 2021-12-02 Bümach International B.V. Arbeitszylinder und Positionsgeber
EP3919758A1 (fr) 2020-06-02 2021-12-08 Bümach Engineering International B.V. Cylindre de travail et capteur de position
DE102021112746A1 (de) 2021-05-17 2022-11-17 Hans E. Winkelmann, Gesellschaft mit beschränkter Haftung Zylinder, Verwendung eines Zylinders

Also Published As

Publication number Publication date
EP0965765A3 (fr) 2002-01-16
ATA104598A (de) 2000-06-15
AT407283B (de) 2001-02-26

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