DE1630067C

DE1630067C - Level regulator for pneumatic or hydropneumatic suspension systems, in particular for motor vehicles

Info

Publication number: DE1630067C
Authority: DE
Inventors: Hans-Jürgen Dr.-Ing. 5850 Hohenlimburg; Löhr Manfred 5868 Letmathe Hoffmann
Original assignee: Hoesch AG
Current assignee: Hoesch AG
Publication date: 1972-09-21

Description

3 43 4

die Ausschubkräfte vorhanden sind, am Stabilisator einer, in die Bohrung 20 hineinragenden Dichtkantethe extension forces are present on the stabilizer of a sealing edge protruding into the bore 20

anordnen, würde ein solches Element als zusätzliche 191 der hohlen Stange 19 auf und wird von einerwould arrange such an element as an additional 191 of the hollow rod 19 and is of a

Feder über den Stabilisator auf das Fahrzeug wirken. Feder 33 und dem Druck im Innenraum der BohrungThe spring acts on the vehicle via the stabilizer. Spring 33 and the pressure in the interior of the bore

Als weiterer Vorteil der Lösung ist der Fortfall eines 20 in dieser Lage gehalten,As a further advantage of the solution, the omission of a 20 is kept in this position,

die hohle Stange führenden Kolbens zu werten. 5 Wird das Fahrzeug beladen, so daß die hohleto evaluate the piston guiding the hollow rod. 5 If the vehicle is loaded so that the hollow

In den Figuren sind Ausführungsbeispiele der Er- Stange 19 einfährt, wird das Einlaßventil 31 vonIn the figures, embodiments of the first rod 19 retracts, the inlet valve 31 of

findung schematisch wiedergegeben. Es zeigt einem Anschlag 231 des Regelrohres 23 von derfinding shown schematically. It shows a stop 231 of the regulating tube 23 of the

F i g. 1 einen Niveauregler in Normalstellung im Dichtkante 191 abgehoben, und es strömt Öl vomF i g. 1 lifted a level regulator in the normal position in the sealing edge 191, and oil flows from the

Schnitt, Hochdruckspeicher über die Leitung 26, den Innen-Section, high pressure accumulator via line 26, the inner

Fig. 2 den Niveauregler der Fig. 1 im Schnitt io raum der Bohrung 20, eine Drosselbohrung 201 undFig. 2 the level controller of FIG. 1 in section io space of the bore 20, a throttle bore 201 and

gemäß der Linie II-II und ein Rückschlagventil 34, das in einer Ausnehmungaccording to the line II-II and a check valve 34, which is in a recess

F i g. 3 eine Anordnung von zwei Niveaureglern 202, die mit dem Innenraum 30 des Gehäuses 14F i g. 3 shows an arrangement of two level regulators 202, which are connected to the interior 30 of the housing 14

für eine Vorderachse. in Verbindung steht, untergebracht ist, in den Innen-for a front axle. is connected, is housed, in the interior

Ein zu einer Federungsanlage gehörender Niveau- raum 30 und von dort durch die Anschlußleitung 18 regler 11 ist mit einem Aufhängeteil 12 beispielsweise 15 zum Federelement. Durch die Drosselbohrung 201 am Aufbau und mit einer Aufhängung 13 an einer wird der Aufregelvorgang verzögert, so daß bei kurzmit einer Radachse verbundenen Halterung 17 be- zeitigem Öffnen des Einlaßventils 31, beispielsweise festigt. In einem zylindrischen Gehäuse 14, dessen beim Durchfahren von Schlaglöchern oder bei beide Seiten mit einer Dichtung 15 und einem Füh- Kurvenfahrt, keine sofortige Ausregelung erfolgt,
rungsstück 16 abschließen, ist eine hohle Stange 19, 20 Der Aufregelvorgang ist beendet, wenn die hohle an ihren beiden Enden abgedichtet, aus dem zylin- Stange 19 so weit ausfährt, daß das Einlaßventil 31 drischen Gehäuse 14 zu beiden Seiten herausragend, wieder auf der Dichtkante 191 liegt. Das Rückschlagverschiebbar geführt. Eine Anschlußleitung 18 stellt ventil 34 und eine Dichtung 35 sind für den Fall erdie Verbindung zwischen dem zylindrischen Gehäuse forderlich, daß durch mehrmaliges Auf- und Ab-14 und einem nicht dargestellten Federelement her. 25 regeln im Stand Druckausgleich zwischen dem nichtA level space 30 belonging to a suspension system and from there through the connection line 18 controller 11 is with a suspension part 12, for example 15, to the spring element. The regulating process is delayed by the throttle bore 201 on the structure and with a suspension 13 on one, so that when the holder 17 is briefly connected to a wheel axle, the inlet valve 31 is opened at an early stage, for example. In a cylindrical housing 14, which is not immediately regulated when driving through potholes or on both sides with a seal 15 and cornering,
Rung piece 16 complete, is a hollow rod 19, 20 The Aufregelvorgang is finished when the hollow sealed at both ends, extends from the cylinder rod 19 so far that the inlet valve 31 drical housing 14 protruding on both sides, again on the Sealing edge 191 lies. The non-return slidably guided. A connecting line 18 provides valve 34 and a seal 35 are required in the event that the connection between the cylindrical housing is made by repeated up and down 14 and a spring element, not shown. 25 do not regulate pressure equalization between the standstill

Eine durchgehende Bohrung 20 der hohlen Stange dargestellten Federelement und dem Hochdruck-A through hole 20 of the hollow rod shown spring element and the high pressure

19 ist auf der einen Seite durch das Aufhängeteil 12 speicher eintritt.19 is on one side through the suspension part 12 memory enters.

und auf der anderen Seite mit einem Deckel 37 ver- Beim Entladen des Fahrzeuges fährt die hohle schlossen. In die Bohrung 20 ragt ein mit ihr axial Stange 19 aus und das Regelrohr 23 wird von einer verlaufendes, in dem Aufhängeteil 12 befestigtes Rohr 3° Kante 192 der hohlen Stange 19 über den Anschlag 21, das über eine Leitung 22 mit einem nicht gezeich- 231 an- und das Auslaßventil 28 von der Querwand neten Niederdruckvorratsraum verbunden ist. Das 39 abgehoben, so daß die Flüssigkeit aus dem mit andere freie Ende dieses Rohres 21 taucht in ein von dem Federelement verbundenen Innenraum 30 des der Bohrung 20 aufgenommenes, verschiebbares Gehäuses 14 durch die Bohrung 281, eine Drossel-Regelrohr 23 ein, wobei eine Dichtung 24 in einem 35 bohrung 36 in den Innenraum 27 des Regelrohres 23, Führungskopf 25 den von der Bohrung 20 gebildeten das Rohr 21 und die Leitung 22 zum Niederdruck-Raum, der über eine Leitung 26 mit einem gleichfalls vorratsraum abfließt.and on the other side with a cover 37. When the vehicle is unloaded, the hollow moves closed. In the bore 20 protrudes with her axially rod 19 and the control tube 23 is of a running, fixed in the suspension part 12 tube 3 ° edge 192 of the hollow rod 19 over the stop 21, which is connected via a line 22 with a 231 not shown and the outlet valve 28 from the transverse wall Neten low pressure reservoir is connected. The 39 lifted off, so that the liquid from the with the other free end of this tube 21 dips into an interior space 30 of the connected by the spring element the bore 20 received, displaceable housing 14 through the bore 281, a throttle control tube 23 a, with a seal 24 in a 35 bore 36 in the interior 27 of the control tube 23, Guide head 25 the pipe 21 formed by the bore 20 and the line 22 to the low-pressure space, which also flows through a line 26 with a storage room.

nicht gezeichneten Hochdruckspeicher in Verbindung Der Abregelvorgang ist beendet, wenn die hohle steht, gegenüber einem Innenraum 27 des Regelrohres Stange 19 so weit eingefahren ist, daß das Auslaß-23, der unter Niederdruck steht, abdichtet. Das Regel- 40 ventil 28 wieder auf der Querwand 39 aufliegt,
rohr 23 wird an seinem unteren Ende von einem Bei der Anordnung von zwei parallel geschalteten Auslaßventil 28 in Gestalt eines als Hubventil arbei- Niveaureglern nach F i g. 3 greifen die hohlen Stantenden Stopfens, der eine axial verlaufende Bohrung gen 19 unter Einschaltung eines Verbindungsstückes 281 aufweist, aufgenommen und verschlossen, wenn 41 an einen Drehstab-Stabilisator 42 an. Sie stehen das Auslaßventil 28 auf einer den Ventilsitz bilden- 45 einerseits mit einem Hochdruckspeicher 43 und einem den Querwand 39 aufliegt. Diese Querwand 39 wird Niederdruckvorratsraum 44, andererseits mit den als unter Einschaltung von Sicherungsringen 40 von dem Federbeine 45 ausgebildeten Federelementen in Verzylindrischen Gehäuse 14 gehalten, wobei sie durch bindung. Bei Beladung federt das Fahrzeug ein und einander gegenüberliegende Langlöcher 38, die im der Drehstab-Stabilisator 42 führt eine Drehbewegung Mittelteil der hohlen Stange 19 angebracht sind, hin- 50 aus, die sich über das Verbindungsstück 41 auf die durchragt. Eine vorgespannte Ventilfeder 29, die an Niveauregler mit den hohlen Stangen 19 überträgt,
der Querwand 39 und am Auslaßventil 28 angreift Hierdurch wird der im Zusammenhang mit F i g. 1 und der Druckunterschied zwischen dem Innenraum beschriebene Regelvorgang ausgelöst. Es strömt so der Bohrung 20 und einem Innenraum 30 des Ge- lange Gas bei pneumatischer Federung bzw. Flüssighäuses 14 gewährleisten diesen Abschluß des Regel- 55 keit bei hydropneumatischer Federung in die Federrohres 23 in der Normalstellung wie beim Aufregeln. elemente, bis sich das Fahrzeug so weit angehoben Ein weiteres, als Einlaßventil 31 arbeitendes Hub- hat, daß der Drehstab-Stabilisator 42 seine Normalventil mit einer Dichtung 32 gleitet auf dem Mantel stellung erreicht hat und der Regelvorgang in den des Regelrohres 23 und liegt bei Normalstellung auf Niveaureglern dadurch beendet wird.High pressure accumulator (not shown) in connection. The regulating process is ended when the hollow is stopped, rod 19 is retracted so far in relation to an interior space 27 of the regulating tube that the outlet 23, which is under low pressure, seals off. The control valve 28 rests again on the transverse wall 39,
tube 23 is at its lower end by a level regulator according to FIG. 3, the hollow stump ends of the plug, which has an axially extending bore 19 with the inclusion of a connecting piece 281, is received and closed when 41 on a torsion bar stabilizer 42. You stand the outlet valve 28 on a valve seat forming 45 on the one hand with a high pressure accumulator 43 and on the transverse wall 39 rests. This transverse wall 39 is low-pressure storage space 44, on the other hand, with the spring elements formed by the spring struts 45 with locking rings 40 being held in the cylindrical housing 14, whereby they are held by binding. When loaded, the vehicle springs in and elongated holes 38 lying opposite one another, which are attached in the torsion bar stabilizer 42 performs a rotary movement in the middle part of the hollow rod 19, outwards which protrudes through the connecting piece 41 onto the. A preloaded valve spring 29 which transmits to level regulators with the hollow rods 19,
the transverse wall 39 and engages the outlet valve 28. As a result, the in connection with FIG. 1 and the pressure difference between the interior space described control process triggered. In this way, gas flows through the bore 20 and an interior space 30 of the pipe in the case of pneumatic suspension or liquid housing 14, ensuring this completion of the regulation in the case of hydropneumatic suspension in the spring tube 23 in the normal position as in the case of upward regulation. elements until the vehicle is raised so far Another, working as an inlet valve 31 has lift that the torsion bar stabilizer 42 has reached its normal valve with a seal 32 slides on the jacket position and the control process in that of the control tube 23 and is included Normal position on level regulators is thereby terminated.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Claim:

Level controller for pneumatic or hydropneumatic ^ Suspension systems, in particular of motor vehicles, the spring elements belonging to the suspension system when the value falls below the Target levels with a high-pressure accumulator and, if the target level is exceeded, with one Low pressure reservoir connects, with one in a cylindrical housing attached to the sprung or the unsprung masses of the vehicle is attached and its interior with the connected spring elements is in connection, axially displaceable hollow rod, which is attached to one end closed by a suspension part to the unsprung or spring-loaded Masses of the vehicle is articulated and its interior is connected to the high-pressure accumulator stands, and with a control tube slidably mounted in the hollow rod, its Interior space via a tube projecting coaxially into the hollow rod with the low-pressure reservoir is connected and which is at one end with an outlet valve for connection of the spring elements with the low-pressure reservoir forming pierced plug on one The transverse wall of the cylindrical housing, against which it is pressed by a valve spring, while it has a stop at its end slidably mounted in the hollow rod, through which, when the target level is exceeded, one shoulder of the hollow rod is taken so that the outlet valve from its valve seat on the transverse wall of the cylindrical Housing is lifted off, and with which there is an inlet valve when the target level is not reached to connect the spring elements with the high-pressure accumulator, the valve body of which on the Control tube is sealed and slidable, lifts from its valve seat in the hollow rod, characterized in that the hollow rod (19) is sealed at both ends protrudes from the cylindrical housing (14), in their always within the cylindrical housing (14) the remaining middle part is provided with opposing elongated holes (38) is through which the valve seat of the outlet valve (28) forming the transverse wall (39) of the cylindrical The housing (14) is held and guided in a displaceable manner with respect to the hollow rod (19), and also at its end opposite the suspension part (12) by a cover (37) is locked.

The invention relates to a level controller for pneumatic or hydropneumatic suspension systems, in particular of motor vehicles, which is used for Suspension system belonging spring elements when falling below the target level with a high pressure accumulator and when the target level is exceeded, it connects with a low-pressure reservoir, with a in a cylindrical housing attached to the sprung or unsprung masses of the vehicle is attached and the interior of which is connected to the connected spring elements, axially displaceable hollow rod which at one end closed by a suspension part to the unsprung or the sprung masses of the vehicle is articulated and its interior with the High-pressure accumulator is in connection, and with a slidably mounted in the hollow rod Control tube, the interior of which is connected to the low-pressure reservoir via a tube projecting coaxially into the hollow rod is connected and which is at one end with an outlet valve for connection of the spring elements with the low-pressure reservoir forming pierced plug on one Transverse wall of the cylindrical housing is supported against which it is pressed by a valve spring while it has a stop at its end displaceably mounted in the hollow rod, through which it is carried along by a shoulder of the hollow rod when the target level is exceeded, so that the The outlet valve is lifted from its valve seat on the transverse wall of the cylindrical housing, and with which there is an inlet valve for connecting the spring elements with the when the target level is not reached High-pressure accumulator, the valve body of which is slidable on the control tube in a sealed manner, from his The valve seat lifts off in the hollow rod.

The subject of an older German patent application that was not previously published is a strut with an internally arranged level controller of the type mentioned, in which a control tube, whose Entrainment takes place through a hollow piston rod of the strut, is arranged and in which the the Up and down controlling valves are designed as lift valves, so that a structurally simple, little stressed and hardly susceptible to wear level control device is created. On transfer this arrangement on a level controller not arranged inside a strut, but on a separate external level regulator would be the pressure inside the level regulator exert an extension force on the hollow rod taking the place of the piston rod, so that the Transmission linkage would have to be designed for these associated loads.

The object on which the invention is based is therefore to provide a level controller of the initially specified to create named genus, in which no extension forces act on the hollow rod.

This object is achieved according to the invention in that the hollow rod at both ends protrudes sealed from the cylindrical housing, in their always within the cylindrical housing remaining central part is provided with mutually opposite elongated holes which held the transverse wall of the cylindrical housing forming the valve seat of the outlet valve and relative to the hollow rod is displaceable, guided, and on its opposite to the suspension part End also covered by a lid

6a is closed.

With the elimination of the extension forces, due to the above feature, the suspension of the level controller in the vehicle are operationally simpler and lighter. Come in addition, that this version allows the articulation of this separate level controller to an auxiliary stabilizer which is only used for control. On the other hand, if you were to use a level control unit with