WO2004018894A1 - Variable gas-filled spring device - Google Patents

Variable gas-filled spring device Download PDF

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Publication number
WO2004018894A1
WO2004018894A1 PCT/EP2003/008820 EP0308820W WO2004018894A1 WO 2004018894 A1 WO2004018894 A1 WO 2004018894A1 EP 0308820 W EP0308820 W EP 0308820W WO 2004018894 A1 WO2004018894 A1 WO 2004018894A1
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WO
WIPO (PCT)
Prior art keywords
piston
tube
pressure
pressure chamber
tailgate
Prior art date
Application number
PCT/EP2003/008820
Other languages
German (de)
French (fr)
Inventor
Matthias Baur
Henrik Weber
Original Assignee
Daimlerchrysler 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 Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2004018894A1 publication Critical patent/WO2004018894A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F16F9/52—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics in case of change of temperature
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
    • E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
    • E05F1/1091—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a gas spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0245—Means for adjusting the length of, or for locking, the spring or dampers
    • F16F9/0263—Means for adjusting the length of, or for locking, the spring or dampers characterised by actuation means, e.g. manually-operated lever arrangement
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05Y2201/00—Constructional elements; Accessories therefore
    • E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefore
    • E05Y2201/404—Motors; Magnets; Springs; Weights; Accessories therefore characterised by the function
    • E05Y2201/416—Motors; Magnets; Springs; Weights; Accessories therefore characterised by the function for counterbalancing

Definitions

  • the invention relates to a device, in particular to support a pivoting movement, with a compression spring with a pressure chamber, which is arranged in a preferably cylindrical tube and has two end closures and is filled with a fluid, with a piston, through which the pressure chamber is divided into two working chambers, and which is guided in the pressure chamber by means of an axially displaceable piston rod.
  • Devices of the aforementioned type with compression springs are used, for example, in tailgates of motor vehicles in which the tailgate is also to be opened against its own weight and to be held automatically in the raised position.
  • the compression springs are also used to support the opening and closing process up to the independent opening and closing of the tailgate.
  • the object of the present invention is to develop a device with a compression spring in such a way that the opening and closing behavior of the actuated component can be controlled right up to automatic actuation.
  • one of the front ends of the pressure chamber is arranged to be axially displaceable by means of a controllable actuating device.
  • the volume of the damper volume and thus also the pressure within the damper volume is changed by shifting the end closure.
  • the force acting on the piston can be changed so that it exceeds or falls below the counterforce of the component to be moved depending on the desired direction of movement.
  • the possibility of controlling the actuating device enables an adjustable change in the pressure in the compression spring.
  • the actuating device has a motor with a gear and a spindle which is operatively connected to the closure, in order to be able to achieve the changes in the volume of the damper volume with this simple device. It is advantageous to design the sliding connection as an additional piston which interacts with the spindle.
  • the actuating device is also advantageously arranged in the tube on the side of the additional piston opposite the pressure chamber. With the arrangement of the actuating device in the pipe, which is aligned with the pressure chamber, a compact and thus only small additional installation space is possible.
  • the actuating device is controlled as a function of the position of the piston via a control device in order to be able to vary the volume and the pressure in the damper volume of the compression spring in a manner adapted to the stage of the pivoting movement.
  • control device has, in a meaningful addition, a displacement sensor with which the position of the piston rod and thus also the stage of the pivoting is determined and this value can be used via the control device to vary the values of the compression spring.
  • the displacement sensor is arranged in the non-displaceable, second end of the pressure chamber penetrated by the piston rod and in this position interacts directly with the piston rod.
  • control device has a temperature sensor.
  • the volume of the fluids used in fluid pressure springs is partly strongly temperature-dependent. With a temperature-related change in volume, the pressure of the fluid also changes, which is why a correction of volume and pressure for relevant temperature changes is necessary for uniform operation of the compression spring. It is also advantageous if the fluid is a gas.
  • Fig. 1 is a partial view of the rear part of a car with a tailgate in a partially broken away view
  • Fig. 2 shows a variable gas pressure spring in a partially schematic, sectional longitudinal view
  • Fig. 4 gas spring analogous to Fig. 3, with a high volume of the damper volume
  • Fig. 1 shows a car 1 with an open tailgate 2 in a half-open position shown in solid line and an end position with maximum opening angle, which is shown in dashed lines.
  • a device 4 for supporting the pivoting movement of the tailgate is arranged between the tailgate 2 and a body part 3 of the car.
  • the device 4 described in detail below with reference to FIG. 2 comprises a compression spring 5 and a control device 6 with which the properties of the compression spring can be changed.
  • the compression spring is designed as a gas pressure spring 5 and consists of a cylindrical tube 7, in which a piston rod 8 is guided with a piston 9 which is fixedly arranged on the end of the piston rod. Tube 7 and piston rod 8 are arranged on the tailgate 2 to be pivoted or on a body part 3.
  • a pipe connection 10 and a piston rod connection 11 are provided, which are spaced apart from one another by the gas pressure spring 5.
  • the gas pressure spring 5 shown in Fig. 2 shows in detail the tube 7, which is divided into two functions.
  • the tube 7 is designed as a work area 12 which is filled with a gas and is closed off from the environment by the closure 14 and a further closure designed as an additional piston 13.
  • the end 14 forms the end of the tube 7 on one side while the additional piston 13 is arranged inside the tube.
  • the piston 9 guided by the piston rod 8 is moved axially and divides the working area into two parts, the gas being located in a damper volume 12a formed between the piston 9 and the additional piston 13.
  • the piston rod 8 is guided on the line of symmetry of the tube 7 and passes through the end 1.
  • the movement of the piston 9 in the axial direction increases or decreases the damper volume 12a and relaxes or compresses the gas in the damper volume 12a.
  • the movement of the piston is resiliently damped by the gas with different spring constants.
  • the pressure conditions in the pressure chamber in the present embodiment according to the invention can be activated actively by axial. Moving the additional piston 13 can be varied.
  • a spindle 15, which interacts with the additional piston 13, is arranged inside the tube 7 and is actuated by a motor 17 via a gear 16.
  • the actuating device with the spindle 15, the gear 16 and the motor 17 is also arranged in the tube 7 in a space-saving and compact manner.
  • control device 6 is provided, with which the properties of the compression spring 5 can be varied, taking into account the movement of the additional piston 13.
  • the control unit 6 is designed so that there are 8 to determine the movement of the 'piston rod via a disposed within the terminal 14 position sensor 18, and therefore in the in Fig. 1 tailgate 2 of a car based on the opening state of the rear hatch of a stored functional relationship, and can handle ,
  • control unit 6 ' also detects the temperature via a temperature sensor 19, in order to be able to take into account changes in the pressure and volume values of the fluid in the damper volume 12a of the compression spring caused by temperature fluctuations.
  • control unit 6 can also interact with a sensor (not shown) for determining the distance of the tailgate to an obstacle, such as, for example, the garage ceiling. 3 and 4, the compression spring is shown in the position of the tailgate 2 shown in dashed lines in FIG. 1.
  • the piston rod 8 is moved out of the tube 7 at most.
  • the piston 9 lies against the end 14.
  • the additional piston 13 tracks the piston 9 in order to reduce the damper volume 12a and to increase the pressure and thus the force on the piston 9.
  • the additional piston 13 is displaced such that the opening movement is supported by the increase in the pressure force transmitted by the piston rod.
  • the transmitted pressure force from the compression spring 5 must be sufficient to at least compensate for the restoring force exerted by the weight of the tailgate and thus to prevent the tailgate from closing independently.
  • the opening movement of the tailgate can also take place automatically and solely through the interaction of the force of the compression spring with the weight of the tailgate.
  • the respective position of the tailgate can be determined with the displacement sensor 18, which records the displacement of the piston rod 9.
  • the distance traveled by the piston rod 9 is set in the control device via a function that has been entered in correlation with the angular position of the tailgate.
  • the damper volume 12a is increased by moving the additional piston 13 away from the piston 9 located in the ⁇ maximum pull-out position and thus reducing the pressure on the piston.
  • the remaining pressure force can either be easily overcome by manual activity or is reduced to such a value, that only the force resulting from the weight of the tailgate 2 (FIG. 1) leads to the piston 9 being retracted into the tube 7.
  • gas pressure spring according to the invention can also be used in combination with pretensioned springs, as are used in a conventional manner in trunk lids.
  • the additional piston 13 can be guided via the control unit in such a way that the force acting on the piston 9 due to the pressure in the damper volume 12a is always at least slightly less than the force resulting from the weight of the tailgate and transmitted via the piston rod 8 Force in the opposite direction and the tailgate is closed automatically.
  • the speed of the movement of the piston rod 8 can also be recorded by means of the displacement sensor 18 and the force generated by the pressure in the damper volume 12a can be adjusted by correspondingly positioning the pistons 9 and 13. This can be the case, for example, if the weight of the tailgate has increased in an unusual way due to accumulated snow in winter.
  • control device 6 interacts via an electrical connection 20 with the actuating device which moves the additional piston 13.

Abstract

The invention relates to a device, particularly for assisting a pivotal motion, comprising a pressure spring (5) having a pressure chamber (12a), which is located inside a preferably cylindrical tube (7) and inside of which a piston (9) is guided via a piston rod (8). The piston (9) divides the pressure chamber (12a) into two working chambers, whereby one of the working chambers forms the damper volume (12a). The damper volume (12a) is filled with a fluid and has endings at each of its faces. One ending (14) is mounted inside the tube (7) in a fixed manner, whereas the second ending is provided in the form of a displaceable supplementary piston (13), with which the pressure inside the damper volume (12a) can be altered by an axial displacement inside the tube (7).

Description

DaimlerChrysler AGDaimlerChrysler AG
Variable GasdruckfederVariable gas pressure spring
Die Erfindung betrifft eine Vorrichtung, insbesondere zur Unterstützung einer Schwenkbewegung, mit einer Druckfeder mit einem in einem vorzugsweise zylindrischen Rohr angeordneten Druckraum mit zwei stirnseitigen Abschlüssen, der mit einem Fluid befüllt ist, mit einem Kolben, durch den der Druckraum in zwei Arbeitskammern unterteilt ist und der mittels einer axial verschiebbaren Kolbenstange in dem Druckraum geführt ist .The invention relates to a device, in particular to support a pivoting movement, with a compression spring with a pressure chamber, which is arranged in a preferably cylindrical tube and has two end closures and is filled with a fluid, with a piston, through which the pressure chamber is divided into two working chambers, and which is guided in the pressure chamber by means of an axially displaceable piston rod.
Vorrichtungen der vorgenannten Art mit Druckfedern finden Anwendung beispielweise bei Heckklappen von Kraftfahrzeugen, bei denen die Heckklappe auch gegen ihr Eigengewicht aufgeklappt und in angehobener Position selbsttätig gehalten werden soll . Des weiteren werden die Druckfedern auch zur Unterstützung des Öffnungs- und Schließvorgangs bis hin zu einem selbständigen Öffnen und Schließen der Heckklappe genutzt.Devices of the aforementioned type with compression springs are used, for example, in tailgates of motor vehicles in which the tailgate is also to be opened against its own weight and to be held automatically in the raised position. The compression springs are also used to support the opening and closing process up to the independent opening and closing of the tailgate.
Separate Antriebseinrichtungen zur Betätigung von Klappen eines Fahrzeugs sind beispielweise aus der DE 10118303 Cl bekannt. Bei der in dieser Druckschrift beschriebenen Antriebseinrichtung wird die Klappe mittels eines auf ein mehrgelenkiges Scharnier einwirkenden Motors betätigt. Um die Leistung des Motors minimieren zu können, werden beim Schließen der Klappe zusätzlich zwei Federn gespannt, deren Spannungsenergie beim Öffnen der Klappe nutzbar ist. Diese Einrichtung ist mechanisch aufwendig und weist einen hohen Platzbedarf auf. Herkömmliche Druckfedern sind in den unterschiedlichsten Anwendungen bekannt. Aus der DE 3301544 AI ist eine Gasfeder als Huborgan zum Öffnen von nach oben schwenkbaren Klappen bekannt, bei der ein Kolben den Zylinder in zwei Arbeitsräume unterteilt. Es besteht aber keine Möglichkeit, auch den Schließprozess der Klappe mit dieser Druckfeder zu unterstützen.Separate drive devices for actuating flaps of a vehicle are known, for example, from DE 10118303 Cl. In the drive device described in this document, the flap is actuated by means of a motor acting on a multi-joint hinge. In order to be able to minimize the power of the motor, two springs are tensioned when the flap is closed, the tension energy of which can be used when the flap is opened. This device is mechanically complex and requires a lot of space. Conventional compression springs are known in a wide variety of applications. From DE 3301544 AI a gas spring is known as a lifting element for opening flaps which can be pivoted upwards, in which a piston divides the cylinder into two working spaces. However, there is no way to support the closing process of the flap with this compression spring.
Ausgehend von dem bekannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Vorrichtung mit einer Druckfeder so weiterzubilden, dass das Öffnungsund Schließverhalten des betätigten Bauteils bis hin zu einer automatischen Betätigung gesteuert werden kann.On the basis of the known prior art, the object of the present invention is to develop a device with a compression spring in such a way that the opening and closing behavior of the actuated component can be controlled right up to automatic actuation.
Zur Lösung dieser Aufgabe wird bei einer gattungsgemäßen Vorrichtung vorgeschlagen, dass einer der stirnseitigen Abschlüsse des Druckraumes mittels einer ansteuerbaren Betätigungseinrichtung axial verschieblich angeordnet ist.To achieve this object, it is proposed in a generic device that one of the front ends of the pressure chamber is arranged to be axially displaceable by means of a controllable actuating device.
Durch die Verschiebung des stirnseitigen Abschlusses wird das Volumen des Dämpfervolumens und damit auch der Druck innerhalb des Dämpfervolumens verändert. Durch Variierung des Druckes kann die auf den Kolben wirkende Kraft so verändert werden, dass sie die Gegenkraft des zu bewegenden Bauteils je nach gewünschter Bewegungsrichtung über- oder unterschreitet. Die Möglichkeit der Ansteuerung der Betätigungseinrichtung ermöglicht eine einstellbare Änderung des Druckes in der Druckfeder.The volume of the damper volume and thus also the pressure within the damper volume is changed by shifting the end closure. By varying the pressure, the force acting on the piston can be changed so that it exceeds or falls below the counterforce of the component to be moved depending on the desired direction of movement. The possibility of controlling the actuating device enables an adjustable change in the pressure in the compression spring.
In einer vorteilhaften Weiterbildung weist die Betätigungseinrichtung einen Motor mit einem Getriebe und eine mit dem Abschluss in Wirkverbindung stehende Spindel auf, um mit dieser einfachen Einrichtung die Änderungen des Volumens des Dämpfervolumens erzielen zu können. Günstig ist es dabei, den verschieblichen Anschluss als einen mit der Spindel zusammenwirkenden Zusatzkolben auszubilden.In an advantageous further development, the actuating device has a motor with a gear and a spindle which is operatively connected to the closure, in order to be able to achieve the changes in the volume of the damper volume with this simple device. It is advantageous to design the sliding connection as an additional piston which interacts with the spindle.
Weiter mit Vorteil ist die Betätigungseinrichtung an der dem Druckraum entgegengesetzten Seite des Zusatzkolbens in dem Rohr angeordnet . Mit der zu dem Druckraum fluchtenden Anordnung der Betätigungseinrichtung in dem Rohr, ist ein kompakter und damit nur geringen zusätzlichen Bauraum beanspruchender Einbau möglich.The actuating device is also advantageously arranged in the tube on the side of the additional piston opposite the pressure chamber. With the arrangement of the actuating device in the pipe, which is aligned with the pressure chamber, a compact and thus only small additional installation space is possible.
In günstiger Weiterbildung wird die Betätigungseinrichtung in Abhängigkeit von der Position des Kolbens über eine Steuereinrichtung gesteuert, um eine Variierung des Volumens und des Drucks in dem Dämpfervolumen der Druckfeder angepasst an das Stadium der Schwenkbewegung vornehmen zu können.In a favorable development, the actuating device is controlled as a function of the position of the piston via a control device in order to be able to vary the volume and the pressure in the damper volume of the compression spring in a manner adapted to the stage of the pivoting movement.
Hierzu weist die Steuereinrichtung in sinnvoller Ergänzung einen Wegsensor auf, mit dem die Position der Kolbenstange und damit auch das Stadium der Verschwenkung bestimmt und dieser Wert über die Steuereinrichtung zur Variierung der Werte der Druckfeder genutzt werden kann.To this end, the control device has, in a meaningful addition, a displacement sensor with which the position of the piston rod and thus also the stage of the pivoting is determined and this value can be used via the control device to vary the values of the compression spring.
In vorteilhafter Ausbildung ist der Wegsensor in dem nicht verschieblichen, zweiten, von der Kolbenstange durchgriffenen Abschluss des Druckraums angeordnet und wirkt in dieser Position direkt mit der Kolbenstange zusammen.In an advantageous embodiment, the displacement sensor is arranged in the non-displaceable, second end of the pressure chamber penetrated by the piston rod and in this position interacts directly with the piston rod.
In einer sinnvollen zusätzlichen Weiterbildung weist die Steuereinrichtung einen Temperatursensor auf . Das Volumen der in Fluiddruckfedern verwendeten Fluide ist teilweise stark temperaturabhängig. Mit einer temperaturbedingten Volumenänderung ändert sich auch der Druck des Fluids, weshalb ein Korrektiv von Volumen und Druck bei relevanten Temperaturänderungen für einen gleichmäßigen Betrieb der Druckfeder notwendig ist. Weiter ist es vorteilhaft, wenn das Fluid ein Gas ist.In a useful additional development, the control device has a temperature sensor. The volume of the fluids used in fluid pressure springs is partly strongly temperature-dependent. With a temperature-related change in volume, the pressure of the fluid also changes, which is why a correction of volume and pressure for relevant temperature changes is necessary for uniform operation of the compression spring. It is also advantageous if the fluid is a gas.
Weitere Vorteile und Merkmale der Erfindung können der nachfolgenden Beschreibung zu dem in der Zeichnung dargestellten Ausführungsbeispiel sowie den einzelnen Patentansprüchen entnommen werden.Further advantages and features of the invention can be found in the following description of the exemplary embodiment shown in the drawing and in the individual patent claims.
In der Zeichnung zeigt:The drawing shows:
Fig. 1 eine Teilansicht des hinteren Teils eines Pkw mit Heckklappe in teilweise aufgebrochener DarstellungFig. 1 is a partial view of the rear part of a car with a tailgate in a partially broken away view
Fig. 2 eine variable Gasdruckfeder in teilschematisierter, geschnittener LängsansichtFig. 2 shows a variable gas pressure spring in a partially schematic, sectional longitudinal view
Fig. 3 Gasdruckfeder mit maximal ausgefahrener Kolbenstange und geringem Volumen des DämpfervolumensFig. 3 gas spring with maximum extended piston rod and small volume of the damper volume
Fig. 4 Gasdruckfeder analog Fig. 3, mit hohem Volumen des DämpfervolumensFig. 4 gas spring analogous to Fig. 3, with a high volume of the damper volume
Fig. 1 zeigt einen Pkw 1 mit einer geöffneten Heckklappe 2 in einer in durchgezogenen Linie dargestellten halbgeöffneten Stellung und einer Endstellung mit maximalem Aufklappwinkel, die strichliniert dargestellt ist. Zwischen der Heckklappe 2 und einem Karosserieteil 3 des Pkw ist eine Vorrichtung 4 zur Unterstützung der Schwenkbewegung der Heckklappe angeordnet.Fig. 1 shows a car 1 with an open tailgate 2 in a half-open position shown in solid line and an end position with maximum opening angle, which is shown in dashed lines. A device 4 for supporting the pivoting movement of the tailgate is arranged between the tailgate 2 and a body part 3 of the car.
Die nachstehend anhand von Fig. 2 detailliert beschriebene Vorrichtung 4 umfasst eine Druckfeder 5 und ein Steuergerät 6, mit dem die Eigenschaften der Druckfeder verändert werden können. Die Druckfeder ist als Gasdruckfeder 5 ausgebildet und besteht aus einem zylindrischen Rohr 7, in dem eine Kolbenstange 8 mit einem stirnseitig fest an der Kolbenstange angeordneten Kolben 9 geführt ist . Rohr 7 und Kolbenstange 8 sind an der zu verschwenkenden Heckklappe 2 bzw. an einem Karosserieteil 3 angeordnet.The device 4 described in detail below with reference to FIG. 2 comprises a compression spring 5 and a control device 6 with which the properties of the compression spring can be changed. The compression spring is designed as a gas pressure spring 5 and consists of a cylindrical tube 7, in which a piston rod 8 is guided with a piston 9 which is fixedly arranged on the end of the piston rod. Tube 7 and piston rod 8 are arranged on the tailgate 2 to be pivoted or on a body part 3.
Hierzu ist ein Rohranschluss 10 und ein Kolbenstangen- anschluss 11 vorgesehen, die durch die Gasdruckfeder 5 voneinander beabstandet sind.For this purpose, a pipe connection 10 and a piston rod connection 11 are provided, which are spaced apart from one another by the gas pressure spring 5.
Die in Fig. 2 dargestellte Gasdruckfeder 5 zeigt detailliert das Rohr 7, das in seiner Funktion zweigeteilt ist. In einem ersten Bereich ist das Rohr 7 als Arbeitsbereich 12 ausgebildet, der mit einem Gas befüllt und durch den Abschluss 14 und einen weiteren, als Zusatzkolben 13 ausgebildeten Abschluss gegenüber der Umgebung abgeschlossen ist. Dabei bildet der Abschluss 14 an einer Seite das Ende des Rohres 7 während der Zusatzkolben 13 innerhalb des Rohres angeordnet ist .The gas pressure spring 5 shown in Fig. 2 shows in detail the tube 7, which is divided into two functions. In a first area, the tube 7 is designed as a work area 12 which is filled with a gas and is closed off from the environment by the closure 14 and a further closure designed as an additional piston 13. The end 14 forms the end of the tube 7 on one side while the additional piston 13 is arranged inside the tube.
In dem Arbeitsbereich 12 wird der durch die Kolbenstange 8 geführte Kolben 9 axial bewegt und unterteilt den Arbeitsbereich in zwei Teile, wobei das Gas in einem zwischen dem Kolben 9 und dem Zusatzkolben 13 gebildeten Dämpfervolumen 12a befindlich ist.In the working area 12, the piston 9 guided by the piston rod 8 is moved axially and divides the working area into two parts, the gas being located in a damper volume 12a formed between the piston 9 and the additional piston 13.
Die Kolbenstange 8 ist auf der Symmetrielinie des Rohres 7 geführt und durchgreift den Abschluss 1 .The piston rod 8 is guided on the line of symmetry of the tube 7 and passes through the end 1.
Die Bewegung des Kolbens 9 in axialer Richtung vergrößert oder verkleinert das Dämpfervolumen 12a und entspannt oder komprimiert das in dem Dämpfervolumen 12a befindliche Gas. Die Bewegung des Kolbens wird durch das Gas mit unterschiedlichen Federkonstanten federnd gedämp t. Während der Bewegung des Kolbens 9, der beispielsweise der Öffnungsbewegung der Heckklappe des Pkw (Fig. 1) folgt, können bei der vorliegenden erfindungsgemäßen Ausbildung die Druckverhältnisse in dem Druckraum aktiv durch axiales. Verschieben des Zusatzkolbens 13 variiert werden.The movement of the piston 9 in the axial direction increases or decreases the damper volume 12a and relaxes or compresses the gas in the damper volume 12a. The movement of the piston is resiliently damped by the gas with different spring constants. During the movement of the piston 9, which follows, for example, the opening movement of the tailgate of the car (FIG. 1), the pressure conditions in the pressure chamber in the present embodiment according to the invention can be activated actively by axial. Moving the additional piston 13 can be varied.
Hierzu ist auf der dem Kolben 9 entgegengesetzten Seite des Zusatzkolbens 13 innerhalb des Rohres 7 eine mit dem Zusatzkolben 13 zusammenwirkende Spindel 15 angeordnet, die über ein Getriebe 16 von einem Motor 17 betätigt wird. Die Betätigungseinrichtung mit der Spindel 15, dem Getriebe 16 und dem Motor 17 ist in platzsparender und kompakter Weise ebenfalls in dem Rohr 7 angeordnet.For this purpose, on the side of the additional piston 13 opposite the piston 9, a spindle 15, which interacts with the additional piston 13, is arranged inside the tube 7 and is actuated by a motor 17 via a gear 16. The actuating device with the spindle 15, the gear 16 and the motor 17 is also arranged in the tube 7 in a space-saving and compact manner.
Außerhalb des Rohres 7 ist das Steuergerät 6 vorgesehen, mit dem unter Berücksichtigung der Bewegung des Zusatzkolbens 13 die Eigenschaften der Druckfeder 5 variiert werden können. Das Steuergerät 6 ist dabei so ausgelegt, dass es die Bewegung der' Kolbenstange 8 über einen in dem Anschluss 14 angeordneten Wegsensor 18 und damit bei der in Fig. 1 Heckklappe 2 eines Pkw den Öffnungszustand dieser Heckklappe anhand eines hinterlegten funktionalen Zusammenhangs ermitteln und verarbeiten kann.Outside the tube 7, the control device 6 is provided, with which the properties of the compression spring 5 can be varied, taking into account the movement of the additional piston 13. The control unit 6 is designed so that there are 8 to determine the movement of the 'piston rod via a disposed within the terminal 14 position sensor 18, and therefore in the in Fig. 1 tailgate 2 of a car based on the opening state of the rear hatch of a stored functional relationship, and can handle ,
Darüber hinaus erfasst das Steuergerät 6 ' über einen Temperatursensor 19 auch die Temperatur, um auch durch Temperaturschwankungen verursachte Änderungen der Druck- und Volumenwerte des Fluids in dem Dämpfervolumen 12a der Druckfeder berücksichtigen zu können.In addition, the control unit 6 ' also detects the temperature via a temperature sensor 19, in order to be able to take into account changes in the pressure and volume values of the fluid in the damper volume 12a of the compression spring caused by temperature fluctuations.
In gleicher Weise kann das Steuergerät 6 auch mit einem nicht dargestellten Sensor zur Ermittlung des Abstandes der Heckklappe zu einem Hindernis, wie beispielsweise • der Garagendecke zusammenwirken. In den Fig. 3 und 4 ist die Druckfeder jeweils in der in Fig. 1 strichliniert dargestellten Position der Heckklappe 2 dargestellt .In the same way, the control unit 6 can also interact with a sensor (not shown) for determining the distance of the tailgate to an obstacle, such as, for example, the garage ceiling. 3 and 4, the compression spring is shown in the position of the tailgate 2 shown in dashed lines in FIG. 1.
In Fig. 3 ist die Kolbenstange 8 maximal aus dem Rohr 7 herausbewegt. Der Kolben 9 liegt dabei dem Abschluss 14 an. Der Zusatzkolben 13 wird dem Kolben 9 nachgeführt, um das Dämpfervolumen 12a zu verringern und den Druck und damit die Kraft auf den Kolben 9 zu erhöhen. Beim Öffnen der Heckklappe wird der Zusatzkolben 13 so verschoben, dass durch die Zunahme der von der Kolbenstange übertragenen Druckkraft die Öffnungsbewegung unterstützt wird. Im maximal geöffneten Zustand der Heckklappe muss die übertragene Druckkraft aus der Druckfeder 5 ausreichend sein, um die durch die Gewichtskraft der Heckklappe ausgeübte Rückstellkraft zumindest kompensieren und damit ein eigenständiges Schließen der Heckklappe verhindern zu können.In Fig. 3, the piston rod 8 is moved out of the tube 7 at most. The piston 9 lies against the end 14. The additional piston 13 tracks the piston 9 in order to reduce the damper volume 12a and to increase the pressure and thus the force on the piston 9. When the tailgate is opened, the additional piston 13 is displaced such that the opening movement is supported by the increase in the pressure force transmitted by the piston rod. When the tailgate is in the maximum open state, the transmitted pressure force from the compression spring 5 must be sufficient to at least compensate for the restoring force exerted by the weight of the tailgate and thus to prevent the tailgate from closing independently.
Bei entsprechender Steuerung der Bewegung des Zusatzkolbens 13 kann die Öffnungsbewegung der Heckklappe auch automatisch und allein durch das Zusammenspiel der Kraft der Druckfeder mit der Gewichtskraft der Heckklappe erfolgen. Die jeweilige Position der Heckklappe kann mit dem Wegsensor 18 ermittelt werden, der den zurückgelegten Weg der Kolbenstange 9 aufnimmt . Der zurückgelegte Weg der Kolbenstange 9 wird in der Steuereinrichtung über eine fest eingegebene Funktion in Korrelation zu der Winkelstellung der Heckklappe gesetzt.With appropriate control of the movement of the additional piston 13, the opening movement of the tailgate can also take place automatically and solely through the interaction of the force of the compression spring with the weight of the tailgate. The respective position of the tailgate can be determined with the displacement sensor 18, which records the displacement of the piston rod 9. The distance traveled by the piston rod 9 is set in the control device via a function that has been entered in correlation with the angular position of the tailgate.
Zur Einleitung des Schließvorgangs der Heckklappe wird wie in Fig. 4 gezeigt, das Dämpfervolumen 12a durch eine Bewegung des Zusatzkolbens 13 weg von dem in ■ der maximalen Auszugsposition befindlichen Kolben 9 vergrößert und damit der Druck auf den Kolben reduziert . Die verbleibende Druckkraft kann entweder durch manuelle Tätigkeit leicht überwunden werden oder ist auf einen solchen Wert reduziert, dass allein die aus der Gewichtskraft der Heckklappe 2 (Fig. 1) resultierende Kraft zu einem Einfahren des Kolbens 9 in das Rohr 7 führt .To initiate the closing process of the tailgate, as shown in FIG. 4, the damper volume 12a is increased by moving the additional piston 13 away from the piston 9 located in the ■ maximum pull-out position and thus reducing the pressure on the piston. The remaining pressure force can either be easily overcome by manual activity or is reduced to such a value, that only the force resulting from the weight of the tailgate 2 (FIG. 1) leads to the piston 9 being retracted into the tube 7.
Alternativ kann die erfindungsgemäße Gasdruckfeder auch in Kombination mit vorgespannten Federn, wie sie in herkömmlicher Weise bei Kofferraumdeckeln eingesetzt sind, verwendet werden.Alternatively, the gas pressure spring according to the invention can also be used in combination with pretensioned springs, as are used in a conventional manner in trunk lids.
Auch beim Schließvorgang der Heckklappe kann der Zusatzkolben 13 über das Steuergerät so geführt werden, dass die durch den Druck im Dämpfervolumen 12a auf den Kolben 9 wirkende Kraft immer zumindest geringfügig kleiner ist, als die aus der Gewichtskraft der Heckklappe resultierende und über die Kolbenstange 8 übertragene Kraft in entgegengesetzter Richtung und die Heckklappe damit automatisch geschlossen wird.Even when the tailgate is closing, the additional piston 13 can be guided via the control unit in such a way that the force acting on the piston 9 due to the pressure in the damper volume 12a is always at least slightly less than the force resulting from the weight of the tailgate and transmitted via the piston rod 8 Force in the opposite direction and the tailgate is closed automatically.
Mittels des Wegsensors 18 kann auch die Geschwindigkeit der Bewegung der Kolbenstange 8 aufgenommen und die durch den Druck im Dämpfervolumen 12a erzeugte Kraft durch entsprechende Positionierung der Kolben 9 und 13 angepasst werden. Dies kann beispielweise dann der Fall sein, wenn sich das Gewicht der Heckklappe durch aufgehäuften Schnee im Winter in ungewöhnlicher Weise erhöht hat.The speed of the movement of the piston rod 8 can also be recorded by means of the displacement sensor 18 and the force generated by the pressure in the damper volume 12a can be adjusted by correspondingly positioning the pistons 9 and 13. This can be the case, for example, if the weight of the tailgate has increased in an unusual way due to accumulated snow in winter.
In den Fig. 2, 3, 4 wirkt das Steuergerät 6 über einen elektrischen Anschluss 20 mit der den Zusatzkolben 13 bewegenden Betätigungseinrichtung zusammen. 2, 3, 4, the control device 6 interacts via an electrical connection 20 with the actuating device which moves the additional piston 13.

Claims

DaimlerChrysler AGPatentansprüche DaimlerChrysler AG patent claims
1. Vorrichtung insbesondere zur Unterstützung einer Schwenkbewegung, mit einer Druckfeder mit einem in einem vorzugsweise zylindrischen Rohr angeordneten Druckraum mit zwei stirnseitigen Abschlüssen, der mit einem Fluid befüllt ist, mit einem Kolben, durch den der Druckraum in zwei Arbeitskammern unterteilt ist und der mittels einer axial verschiebbaren Kolbenstange in dem Druckraum geführt ist, d a d u r c h g e k e n n z e i c h n e t, dass einer der stirnseitigen Abschlüsse des Rohres (7) mittels einer ansteuerbaren Betätigungseinrichtung axial verschieblich angeordnet ist.1.Device in particular to support a pivoting movement, with a compression spring with a pressure chamber arranged in a preferably cylindrical tube with two end closures, which is filled with a fluid, with a piston, through which the pressure chamber is divided into two working chambers and which by means of a axially displaceable piston rod is guided in the pressure chamber, characterized in that one of the end closures of the tube (7) is arranged to be axially displaceable by means of a controllable actuating device.
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, dass die Betätigungseinrichtung einen Motor (17) mit einem Getriebe (16) und eine mit dem verschieblichen Abschluss in Wirkverbindung stehende Spindel (15) aufweist .2. Device according to claim 1, so that the actuating device has a motor (17) with a gear (16) and a spindle (15) that is operatively connected to the movable end.
3. Vorrichtung nach Anspruch 1 oder 2 , d a d u r c h g e k e nn z e i c h n e t, dass der verschiebliche Anschluss ein mit der Spindel3. Device according to claim 1 or 2, d a d u r c h g e k e nn z e i c h n e t that the sliding connection one with the spindle
(15) zusammenwirkender Zusatzkolben (13) ist.(15) cooperating additional piston (13).
4. Vorrichtung nach einem der Ansprüche 1 bis 3 , d a d u r c h g e k e n n z e i c h n e t, dass die Betätigungseinrichtung an der einer als Dämpfervolumen (12a) ausgebildeten Arbeitskammer des Druck- raumes (12) entgegengesetzten Seite des Zusatzkolbens (13) in dem Rohr (7) angeordnet ist.4. Device according to one of claims 1 to 3, characterized in that the actuating device on the one designed as a damper volume (12a) working chamber of the pressure space (12) opposite side of the additional piston (13) in the tube (7) is arranged.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, dass die Betätigungseinrichtung in Abhängigkeit von der Position des Kolbens (9) über eine Steuereinrichtung (6) gesteuert wird.5. Device according to one of claims 1 to 4, so that the actuating device is controlled as a function of the position of the piston (9) via a control device (6).
6. Vorrichtung nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t, dass die Steuereinrichtung einen Wegsensor (18) aufweist .6. The device as claimed in claim 5, so that the control device has a displacement sensor (18).
7. Vorrichtung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t, dass der Wegsensor (18) in dem nicht verschieblichen, zweiten, von der Kolbenstange (8) durchgriffenen Abschluss (14) des Druckraums (12a) angeordnet ist.7. The device according to claim 6, so that the displacement sensor (18) is arranged in the non-displaceable, second end (14) of the pressure chamber (12a) penetrated by the piston rod (8).
8. Vorrichtung nach einem der Ansprüche 5 bis 7, d a d u r c h g e k e n-n-z e i c h n e t, dass die Steuereinrichtung (6) zumindest einen Sensor aufweist8. Device according to one of claims 5 to 7, d a d u r c h g e k e n-n-z e i c h n e t that the control device (6) has at least one sensor
9. Vorrichtung nach einem der Ansprüche 5 bis 7, d a d u r c h g e k e n n z e i c h n e t, dass der Sensor ein Temperatursensor (19) ist.9. Device according to one of claims 5 to 7, d a d u r c h g e k e n n z e i c h n e t that the sensor is a temperature sensor (19).
10. Vorrichtung nach einem der Ansprüche 1 bis 8, d a du r c h g e k e n n z e i c hn e t, dass das Fluid ein Gas ist. 10. The device according to one of claims 1 to 8, that the fluid is a gas.
PCT/EP2003/008820 2002-08-22 2003-08-08 Variable gas-filled spring device WO2004018894A1 (en)

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