EP0345459B1 - Pneumatisches Stellelement - Google Patents

Pneumatisches Stellelement Download PDF

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Publication number
EP0345459B1
EP0345459B1 EP89107990A EP89107990A EP0345459B1 EP 0345459 B1 EP0345459 B1 EP 0345459B1 EP 89107990 A EP89107990 A EP 89107990A EP 89107990 A EP89107990 A EP 89107990A EP 0345459 B1 EP0345459 B1 EP 0345459B1
Authority
EP
European Patent Office
Prior art keywords
switch
piston
housing
pneumatic
control element
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
Application number
EP89107990A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0345459A3 (en
EP0345459A2 (de
Inventor
Karl-Heinz Santelmann
Josef Stümpel
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP0345459A2 publication Critical patent/EP0345459A2/de
Publication of EP0345459A3 publication Critical patent/EP0345459A3/de
Application granted granted Critical
Publication of EP0345459B1 publication Critical patent/EP0345459B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B15/2892—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
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches

Definitions

  • the invention relates to a pneumatic control element, in particular for central locking systems in motor vehicles with a housing, with a piston rod which is displaceably mounted in the housing, with a piston which is connected to the piston rod and which, together with a housing part, forms a pressure chamber with a pneumatic pressure connection which connects the pressure chamber to a pressure source, with an electrical switch that can be actuated depending on the position of the piston rod relative to the housing, the switch being arranged in the pressure chamber and the switch being actuable by the piston, and a stamp being provided by the Piston is displaceable relative to the housing and through which the switch can be actuated.
  • Such a pneumatic actuator is previously known from US-A-3,303,755.
  • the actuating element there is designed as a double-acting diaphragm actuator, in which an electrical switch actuated by the piston is provided in the working chamber opposite the piston rod.
  • a stamp is arranged between the switch and the piston for actuating the switch.
  • a single-acting pneumatic actuating cylinder in which an electrical switch which can be actuated by the piston is arranged in the pressure chamber, which is located on the side of the piston facing away from the piston rod.
  • a stamp is provided between the switch and the piston, which, however, is not designed to be displaceable relative to the housing but rather to be pivotable.
  • This known pneumatic control element has the disadvantage that additional space is required for the arrangement of the electrical switch above the piston, so that this known control element has a large overall height, in view of the fact that such control elements are often arranged in doors or flaps of motor vehicles and the space available in such doors or flaps of the motor vehicle is often small, the required installation height of the pneumatic actuating element can be too large in certain installation situations due to this known arrangement of the switch. This can lead to the fact that motor vehicles with correspondingly narrow installation spaces cannot be equipped with such previously known pneumatic control elements and that accordingly the installation of the entire central locking system is put into question.
  • this known pneumatic control element has the disadvantage that, due to the known sensitivity of electrical switches to dirt and moisture, the housing space above the piston must be sealed with additional sealants against the ingress of moisture and dirt. Such sealants are often necessary only for this reason, so that additional, costly to procure and assemble parts are required by the known arrangement of the switch.
  • the object of the invention is to further develop the previously known pneumatic control elements in such a way that they can be manufactured more simply and more cost-effectively and that the switch actuation is safer than the previously known.
  • the stamp has an approach that operates the switch and that the switch is a snap switch that has a preferred switching position.
  • Such snap switches have the advantage of having a defined switchover point, so that the switchover takes place even with slight changes in the position of the piston or the piston rod relative to the housing.
  • the use of such snap switches caused difficulties because such snap switches have extensive mechanics, are filigree and therefore particularly sensitive to environmental influences such as moisture and dirt.
  • the snap switch can be actuated by a stamp which is displaceable relative to the housing by the piston of the pneumatic actuating element. This gives you more leeway with regard to the installation location of the snap switch in the pressure chamber and with regard to its installation position in the construction of the pneumatic actuating element according to the invention.
  • the stamp has an extension which actuates the snap switch, which also allows greater scope in the construction of the pneumatic actuating element according to the invention.
  • the pressure chamber of the pneumatic actuating element is connected via the pressure connection to a pneumatic pressure wave generating positive and / or negative pressure and, if appropriate, to pneumatic switching devices.
  • the connection is usually made via hose lines.
  • the pressure chamber is so compared to the environment of the pneumatic control element and environmental influences in this environment, such as. B. essentially sealed moisture and dirt. Due to the arrangement of the electrical snap switch in this pressure chamber, the electrical switch is essentially completely protected against all environmental influences, such as moisture and dirt in particular, because the pressure chamber together with the other parts, for. B. the central locking forms a closed system against the environment.
  • the switch is arranged on a plug-like part, the plug being insertable into a corresponding recess in the housing part.
  • the plug can have a guide in which the spring is arranged and in which the plunger is displaceably guided. This then has the advantage that the complete arrangement consisting of switch, plug, stamp, spring and shoulder are combined to form an assembly part and can be assembled together as a plug-like assembly part by inserting it into a corresponding recess in the housing part on the housing of the pneumatic actuating element according to the invention.
  • the switch is arranged on the same side of the housing as the pressure connection, because the pressure connection in each case takes up a structural depth and because the arrangement of the switch on the pneumatic actuating element according to the invention hardly takes up any more space than the pressure connection.
  • a membrane in particular a rolling membrane, is provided which seals the piston against the housing part.
  • a correspondingly tight fit of the piston in the housing part can be dispensed with.
  • the single figure shows a pneumatic actuator according to the invention in section.
  • the pneumatic actuating element according to the invention has a housing 1, which consists of a first upper housing part 2 and a second lower housing part 3.
  • the two housing parts 2 and 3 are connected to one another by a known latching connection
  • a piston rod 4 is arranged displaceably in the first upper housing part 2 of the housing 1.
  • the piston rod 4 is only weakly guided in the first upper housing part 2 in order, if necessary, to tolerances when installing the pneumatic actuating element according to the invention in the door or flap of a motor vehicle and a possible offset between the piston rod and parts of the rest of the central locking system to be connected to the piston rod or the lock. This weak guidance is brought about by the fact that a considerable play is provided between the piston rod 4 and the first housing part 2.
  • the piston rod 4 is firmly connected to a piston 5.
  • the piston 5 is substantially enclosed by a rolling membrane 6, the edge of which is bulged and is pressed in a corresponding groove between the first upper housing part 2 and the second lower housing part 3.
  • the lower second housing part 3 has a pneumatic pressure connection 8.
  • a recess or bore is provided in the second lower housing part 3, in which a stopper-like part 13 is inserted in a pressure-tight manner via a seal and is locked in a known manner.
  • An electrical switch 9, which is designed as a snap switch, is arranged on or in the plug 13.
  • a stamp 10 is arranged in the plug-like part or plug 13 in a corresponding guide (14).
  • the stamp 10 is loaded by a helical or cylindrical spring 11 in the starting position shown in the figure.
  • the spring 11 is also arranged in the guide 14 of the plug 13.
  • the stamp 10 has an extension 12 through which the switch 9 can be actuated.
  • the piston 5, the rolling membrane 6, the lower housing part 3 and the plug-like part 13 delimit a pressure chamber 7, which is connected to the surroundings of the pneumatic actuating element solely through the pneumatic pressure connection 8.
  • the pressure connection 8 is connected in a known manner via corresponding hose lines to a pressure source, so that the arrangement consisting of the pressure chamber 7, the hose line and the pressure source, which in the Figure is not shown, forms a system closed to the environment of the pneumatic actuator.
  • the pneumatic actuator according to the invention works as follows: In the figure, the unlocking position of the pneumatic actuator is shown, which is characterized in that the piston 5 and thus the piston rod 4 are in the position facing away from the electrical switch 9. In this case, the plunger 10 is relieved of the pressure by the piston 5, so that the spring 11 pushes the plunger 10 out of the guide 14 of the plug 13, as shown in the figure. In this case, the electrical switch 9 is also relieved of the attachment 12 and the electrical switch 9 has the switching position shown in the figure, in which the middle switching contact rests on the right fixed contact.
  • the pneumatic actuating element according to the invention is now supplied with negative pressure from the pressure source (not shown in the figure) via the pressure connection 8, a negative pressure is formed in the pressure chamber 7, which actuates the plunger 5 with the rolling membrane 6 in the direction of the electrical switch 9 into the locking position .
  • the piston 5 presses the roller 10 against the force of the spring 11 into the guide 14 of the plug-like part 13 via the rolling membrane 6.
  • the stamp 10 is thus moved down in the figure. With the stamp 10 is approach 12 of the stamp 10 in the direction in the figure downwards, whereby the electrical switch 9 is actuated such that the middle movable contact folds over and rests on the left contact in the figure.
  • the electrical switch 9 has then changed its electrical switching state.
  • the stamp 5 together with the rolling membrane 6 is pressed upwards again in the direction of the unlocking position shown in the figure.
  • the plunger 10 is relieved of the load by the piston 5 or the rolling diaphragm 6 and, due to the force of the spring 11, moves back up into the position shown in the figure.
  • the neck 12 is moved up again, so that the actuation of the electrical switch 9 by the neck 12, as shown in the figure, is canceled. Because of this relief, the electrical switch changes its switching state back to the position shown in the figure, in which the movable center contact rests against the fixed contact on the right in the figure.
  • the pneumatic actuator according to the invention can not only be used for central locking systems in motor vehicles.
  • the pneumatic control element it is also possible to use other devices in the motor vehicle such as. B. to control cooling air intakes in engine compartments with internal combustion engines.

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)
EP89107990A 1988-06-09 1989-05-03 Pneumatisches Stellelement Expired - Lifetime EP0345459B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8807543U 1988-06-09
DE8807543U DE8807543U1 (de) 1988-06-09 1988-06-09 Pneumatisches Stellelement

Publications (3)

Publication Number Publication Date
EP0345459A2 EP0345459A2 (de) 1989-12-13
EP0345459A3 EP0345459A3 (en) 1990-09-26
EP0345459B1 true EP0345459B1 (de) 1992-11-25

Family

ID=6824884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107990A Expired - Lifetime EP0345459B1 (de) 1988-06-09 1989-05-03 Pneumatisches Stellelement

Country Status (3)

Country Link
EP (1) EP0345459B1 (es)
DE (2) DE8807543U1 (es)
ES (1) ES2035982T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7044444B2 (en) 2003-02-04 2006-05-16 Mann & Hummel Gmbh Actuator element with position detection

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026381A1 (de) * 1990-08-21 1992-03-05 Hella Kg Hueck & Co Kraftfahrzeug-tuerverschluss
FR2670882B1 (fr) * 1990-12-20 1994-05-20 Bendix Europe Services Technique Dispositif de mesure de la position d'une tige de poussee d'un servomoteur pneumatique.
DE19929074A1 (de) * 1999-06-25 2000-12-28 Mann & Hummel Filter Stelleinrichtung mit Sensor
FR2891393B1 (fr) * 2005-09-23 2007-12-21 Dav Sa Dispositif de commande comportant un mecanisme de point dur et actionnant des contacts electriques
CN111379763A (zh) * 2018-12-31 2020-07-07 重庆海峻机电设备有限公司 一种带有测位装置的电机座

Family Cites Families (25)

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Publication number Priority date Publication date Assignee Title
GB147196A (en) * 1919-07-01 1921-10-06 Dorr Co Method for the selective recovery of organic materials from liquids
US2554266A (en) * 1948-12-02 1951-05-22 Bendix Aviat Corp Pressure actuated switch
US2921159A (en) * 1958-10-13 1960-01-12 Robertshaw Fulton Controls Co Push button control device
FR1279085A (fr) * 1961-02-07 1961-12-15 Sulzer Ag Assemblage étanche d'une pièce austénitique avec une pièce ferritique comportant un placage austénitique
AT239621B (de) * 1962-07-18 1965-04-12 Festo Maschf Stoll G Arbeitszylinder für pneumatische und hydraulische Arbeitsmedien
US3209094A (en) * 1962-11-05 1965-09-28 Robertshaw Controls Co Pressure switch with high and low pressure spring adjustments
US3303755A (en) * 1964-03-16 1967-02-14 Grinnell Corp Actuator position indicators
US3382770A (en) * 1964-10-01 1968-05-14 Parker Hannifin Corp Mechanism for controlling a fluid motor
US3414693A (en) * 1966-04-29 1968-12-03 Tomkins Johnson Co Cylinder head limit switch assembly
DE1601763B2 (de) * 1968-03-06 1972-01-27 Tuchenhagen, Otto, 2059 Buchen Pneumatisch gesteuerte zylinder kolben einheit mit elektrischeranzeige der kolbenendlage
US3566060A (en) * 1968-06-07 1971-02-23 F W Dwyer Mfg Co Inc Pressure responsive switch with improved diaphragm operating means
DD101469A1 (es) * 1972-12-21 1973-11-12
DE2421763A1 (de) * 1974-05-06 1975-11-20 Bosch Gmbh Robert Hydromechanischer druck-weg-wandler
FR2377021A1 (fr) * 1977-01-06 1978-08-04 Outillage Air Comprime Dispositif de detection de la position d'un piston
DE7916521U1 (de) * 1978-06-12 1982-03-18 Midland-Ross Corp., 44122 Cleveland, Ohio Zylinder- und Kolbeneinheit mit Kolbenüberweganzeige
DE7916523U1 (de) * 1978-06-12 1982-03-18 Midland-Ross Corp., 44122 Cleveland, Ohio Kolben-Zylinder-Aggregat mit einer Überweg-Anzeigeeinrichtung
DE2835406A1 (de) * 1978-08-12 1980-02-21 Bosch Gmbh Robert Membran-arbeitszylinder
DE2936821C2 (de) * 1979-09-12 1983-10-06 Daimler-Benz Ag, 7000 Stuttgart Pneumatische Zentralverriegelungsanlage für ein Kraftfahrzeug
DE3014331C2 (de) * 1980-04-15 1982-03-11 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Arbeitszylinder mit einem Kolbenendstellungsgeber
SE430531B (sv) * 1980-07-10 1983-11-21 Atlas Copco Ab Tryckfluidumdriven cylinderanordning med endlegesindikering
DE3122120A1 (de) * 1981-06-04 1983-01-05 Pierburg Gmbh & Co Kg, 4040 Neuss Wegsteller
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DE8128317U1 (de) * 1981-09-26 1983-03-10 Robert Bosch Gmbh, 7000 Stuttgart Schalterelement zur steuerung der zentralverriegelung in kraftfahrzeugen
DE3627695A1 (de) * 1986-08-14 1988-02-25 Teves Gmbh Alfred Elektrohydraulische schaltvorrichtung
DE8703595U1 (de) * 1987-03-10 1987-07-16 Hamke, Herbert, 32584 Löhne Elektrohydraulischer oder pneumatischer Schalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7044444B2 (en) 2003-02-04 2006-05-16 Mann & Hummel Gmbh Actuator element with position detection

Also Published As

Publication number Publication date
DE58902802D1 (de) 1993-01-07
ES2035982T3 (es) 1993-05-01
EP0345459A3 (en) 1990-09-26
DE8807543U1 (de) 1988-08-04
EP0345459A2 (de) 1989-12-13

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