[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

DE3732978A1 - Device for calming foamed damping medium in shock absorbers - Google Patents

Device for calming foamed damping medium in shock absorbers

Info

Publication number
DE3732978A1
DE3732978A1 DE19873732978 DE3732978A DE3732978A1 DE 3732978 A1 DE3732978 A1 DE 3732978A1 DE 19873732978 DE19873732978 DE 19873732978 DE 3732978 A DE3732978 A DE 3732978A DE 3732978 A1 DE3732978 A1 DE 3732978A1
Authority
DE
Germany
Prior art keywords
tube
shock absorber
inner tube
annular space
bottom valve
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Withdrawn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
DE19873732978
Other languages
German (de)
Inventor
Manfred Ing Grad Grundei
Otto Samonil
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.)
ZF Friedrichshafen AG
Original Assignee
Fichtel and Sachs 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 Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Priority to DE19873732978 priority Critical patent/DE3732978A1/en
Publication of DE3732978A1 publication Critical patent/DE3732978A1/en
Withdrawn legal-status Critical Current

Links

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
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
    • F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
    • F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
    • F16F9/185—Bitubular units

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

Shock absorber (10) with an inner tube (11) and an outer tube (12) which is arranged around the inner tube, leaving an annular space (13). A piston (14) on a piston rod can be retracted and extended into and out of the inner tube. The interior (18) of the inner tube (11) is connected to the annular space via a bottom valve (17). An intermediate tube (19) is arranged in the annular space (13). The intermediate tube (19) is kept free at a predetermined distance (20) from the bottom valve (17). <IMAGE>

Description

Die Erfindung betrifft einen Stoßdämpfer mit einem, mit einem liquiden Dämpfermedium gefüllten Innenrohr und einem Außenrohr, welches unter Freilassung eines zumindest teil­ weise mit einem Druckgas gefüllten Ringraums um das Innen­ rohr herum angeordnet ist, mit einem Kolben, der an einer Kolbenstange in das Innenrohr ein- und ausfahrbar ist und mit einem Bodenventil, über das das Innenrohr zur Ableitung des Dämpfermediums mit dem Ringraum verbunden ist.The invention relates to a shock absorber with a a liquid damper medium filled inner tube and one Outer tube, which is at least partially free wise with a pressurized gas filled annulus around the inside tube is arranged around, with a piston, which on a Piston rod is retractable and extendable into the inner tube and with a bottom valve through which the inner pipe for discharge of the damper medium is connected to the annulus.

Bei bekannten Zweirohrstoßdämpfern, bei denen der Ringraum zum Teil mit einem Druckgas gefüllt ist und als Ausgleichs­ raum für das von der einfahrenden Kolbenstange verdrängte Volumen dient, kann es bei höheren Schwingungsfrequenzen zur Verschäumung des als Dämpfermedium verwendeten Öls mit dem in dem Ausgleichsraum befindlichen Gas kommen. Diese Verschäumung kann im ungünstigen Fall durch das Bodenventil in den Dämpferinnenraum gelangen und dort ein Gaspolster bilden, das zu Einbrüchen in der Dämpfkraft führt.In known two-tube shock absorbers, in which the annulus is partly filled with a compressed gas and as compensation space for the displaced by the retracting piston rod Volume serves, it can at higher vibration frequencies to foam the oil used as a damping medium the gas in the equalization room. These In the worst case, foaming can occur through the bottom valve get into the damper interior and there is a gas cushion form, which leads to drops in the damping force.

Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung zu schaffen, mit der die Verschäumung des Dämpfermediums verringert und das Eintreten des Schaums in das Bodenventil vermieden werden kann. The object of the present invention is a device to create with the foaming of the damper medium reduced and the entry of foam into the bottom valve can be avoided.  

Gelöst wird diese Aufgabe dadurch, daß in dem Ringraum ein Zwischenrohr angeordnet ist. Durch diese Maßnahmen wird ein Zweirohrstoßdämpfer geschaffen, bei dem das die Verschäu­ mung bewirkende Gas beschleunigt aus dem Öl separiert wer­ den kann. Das verschäumte Öl schlägt sich an dem Zwischen­ rohr nieder und kann an ihm in das klare Öl zurückfließen. Das verschäumte Öl wird auf diese Weise von dem Bodenventil ferngehalten und die Trennung des Gases von dem Öl beschleu­ nigt.This problem is solved in that in the annulus Intermediate tube is arranged. Through these measures, a Two-tube shock absorber created, in which the Schäu The accelerating gas accelerates who is separated from the oil that can. The foamed oil hits the middle pipe down and can flow back into the clear oil. The foamed oil is in this way from the bottom valve kept away and accelerated the separation of the gas from the oil nends.

Weitere vorteilhafte Maßnahmen sind in den Unteransprüchen beschrieben. Die Erfindung ist in der beiliegenden Zeich­ nung dargestellt und wird nachfolgend näher beschrieben.Further advantageous measures are in the subclaims described. The invention is in the accompanying drawing shown and will be described in more detail below.

Der in der einzigen Figur dargestellte Zweirohr-Stoßdämpfer 10 besteht im wesentlichen aus einem Innenrohr 11 und einem Außenrohr 12. Zwischen dem Innenrohr 11 und dem Außenrohr 12 besteht ein Ringraum 13 für das von der einfahrenden Kolbenstange 15 verdrängte Dämpfermedium. In dem Innenrohr 11 ist ein Kolben 14 hin- und hergehbar angeordnet, der an einer Kolbenstange 15 befestigt ist.The two-tube shock absorber 10 shown in the single figure consists essentially of an inner tube 11 and an outer tube 12 . Between the inner tube 11 and the outer tube 12 there is an annular space 13 for the damper medium displaced by the retracting piston rod 15 . A piston 14 , which is fastened to a piston rod 15 , is arranged in a reciprocating manner in the inner tube 11 .

Die Kolbenstange 15 ist in einer Kolbenstangenführung 16 aus dem Innenrohr 11 herausgeführt. Der Innenraum 18 des Innenrohrs 11 ist mit einem Dämpfermedium, vorzugsweise Öl gefüllt, das über ein Bodenventil 17 mit dem Ringraum 13 verbunden ist. The piston rod 15 is guided out of the inner tube 11 in a piston rod guide 16 . The interior 18 of the inner tube 11 is filled with a damper medium, preferably oil, which is connected to the annular space 13 via a bottom valve 17 .

Zur Beruhigung des während des Betriebs verschäumten Öls ist in dem Ringraum 13 ein Zwischenrohr 19 vorgesehen, das mit einem Abstand 20 gegenüber dem Bodenventil 17 frei­ liegt. Das Zwischenrohr 19 ist an der Kolbenstangenführung 16 befestigt, beispielsweise eingeklemmt, verschweißt oder verklebt. Bei einer Ausführungsform kann es vorgesehen sein, das Zwischenrohr 19 mit Durchbrechungen 21 zu ver­ sehen. To calm the foamed oil during operation, an intermediate pipe 19 is provided in the annular space 13 , which is exposed at a distance 20 from the bottom valve 17 . The intermediate tube 19 is fastened to the piston rod guide 16 , for example clamped, welded or glued. In one embodiment, it can be provided to see the intermediate tube 19 with openings 21 ver.

BezugszeichenReference numerals

10 Zweirohr-Stoßdämpfer
11 Innenrohr
12 Außenrohr
13 Ringraum
14 Kolben
15 Kolbenstange
16 Kolbenstangenführung
17 Bodenventil
18 Innenraum
19 Zwischenrohr
20 Abstand
21 Durchbrechung 10 two-tube shock absorbers
11 inner tube
12 outer tube
13 annulus
14 pistons
15 piston rod
16 piston rod guide
17 bottom valve
18 interior
19 intermediate tube
20 distance
21 breakthrough

Claims (7)

1. Stoßdämpfer mit einem mit einem, liquiden Dämpfermedium gefüllten Innenrohr und einem Außenrohr, welches unter Freilassung eines zumindest teilweise mit einem Druckgas gefüllten Ringraums um das Innenrohr herum angeordnet ist, mit einem Kolben, der an einer Kolbenstange in das Innen­ rohr ein- und ausfahrbar ist und mit einem Bodenventil, über das das Innenrohr zur Ableitung des Dämpfermediums mit dem Ringraum verbunden ist, dadurch gekennzeichnet, daß in dem Ringraum (13) ein Zwischenrohr (19) angeordnet ist.1. Shock absorber with an inner tube filled with a liquid damping medium and an outer tube, which is arranged around the inner tube with the release of an at least partially filled with a pressurized gas annular space, with a piston that can be extended and retracted into the inner tube on a piston rod is and with a bottom valve, via which the inner tube for discharging the damper medium is connected to the annular space, characterized in that an intermediate tube ( 19 ) is arranged in the annular space ( 13 ). 2. Stoßdämpfer nach Anspruch 1, dadurch gekennzeichnet, daß das Zwischenrohr (19) mit einem vorbestimmten Abstand (20) zum Bodenventil (17) freigehalten ist.2. Shock absorber according to claim 1, characterized in that the intermediate tube ( 19 ) with a predetermined distance ( 20 ) to the bottom valve ( 17 ) is kept free. 3. Stoßdämpfer nach den Ansprüchen 1 und 2, dadurch gekenn­ zeichnet, daß das Zwischenrohr (19) an der, dem Bodenventil (17) gegenüberliegenden Führung (16) für die Kolbenstange festgelegt ist. 3. Shock absorber according to claims 1 and 2, characterized in that the intermediate tube ( 19 ) on the, the bottom valve ( 17 ) opposite guide ( 16 ) for the piston rod is fixed. 4. Stoßdämpfer nach den Ansprüchen 1 bis 3, dadurch gekenn­ zeichnet, daß der Abstand (20) variabel ist.4. Shock absorber according to claims 1 to 3, characterized in that the distance ( 20 ) is variable. 5. Stoßdämpfer nach den Ansprüchen 1 bis 4, dadurch gekenn­ zeichnet, daß das Zwischenrohr (19) wahlweise aus Kunst­ stoff oder Metall ist.5. Shock absorber according to claims 1 to 4, characterized in that the intermediate tube ( 19 ) is optionally made of plastic or metal. 6. Stoßdämpfer nach den Ansprüchen 1 bis 5, dadurch gekenn­ zeichnet, daß das Zwischenrohr (19) Durchbrechungen (21) aufweist.6. Shock absorber according to claims 1 to 5, characterized in that the intermediate tube ( 19 ) has openings ( 21 ). 7. Stoßdämpfer nach den Ansprüchen 1 bis 6, dadurch gekenn­ zeichnet, daß das Zwischenrohr (19) mittig in dem Ringraum (13) angeordnet ist.7. Shock absorber according to claims 1 to 6, characterized in that the intermediate tube ( 19 ) is arranged centrally in the annular space ( 13 ).
DE19873732978 1987-09-30 1987-09-30 Device for calming foamed damping medium in shock absorbers Withdrawn DE3732978A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873732978 DE3732978A1 (en) 1987-09-30 1987-09-30 Device for calming foamed damping medium in shock absorbers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873732978 DE3732978A1 (en) 1987-09-30 1987-09-30 Device for calming foamed damping medium in shock absorbers

Publications (1)

Publication Number Publication Date
DE3732978A1 true DE3732978A1 (en) 1989-04-13

Family

ID=6337249

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873732978 Withdrawn DE3732978A1 (en) 1987-09-30 1987-09-30 Device for calming foamed damping medium in shock absorbers

Country Status (1)

Country Link
DE (1) DE3732978A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029490A1 (en) * 1990-09-18 1992-03-19 Boge Ag Vehicle hydraulic piston-cylinder vibration damper - has secondary piston fitted in guide tube inside main piston rod
DE102005001743B3 (en) * 2005-01-14 2006-07-06 Zf Friedrichshafen Ag Spring carrier for use between vehicle body and axel part, has threaded spindle with larger inner diameter than cylinder of vibration damper, so that cylinder can be deflected into threaded spindle
EP1681186A1 (en) 2005-01-14 2006-07-19 Zf Friedrichshafen Ag Spring support with adjustable spring plate
DE102015203522A1 (en) * 2015-02-27 2016-09-01 Zf Friedrichshafen Ag Piston rod cylinder unit with an intermediate pipe
CN109780118A (en) * 2019-03-05 2019-05-21 合肥工业大学 A kind of gradual damping shock absorber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB569347A (en) * 1941-11-12 1945-05-18 Monroe Auto Equipment Co Improvements in or relating to hydraulic shock absorbers
GB924478A (en) * 1960-11-24 1963-04-24 Woodhead Monroe Ltd Improvements in or relating to shock absorbers
DE3322366A1 (en) * 1983-06-22 1985-01-10 Fichtel & Sachs Ag, 8720 Schweinfurt TWO TUBE VIBRATION DAMPER FOR VEHICLES

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB569347A (en) * 1941-11-12 1945-05-18 Monroe Auto Equipment Co Improvements in or relating to hydraulic shock absorbers
GB924478A (en) * 1960-11-24 1963-04-24 Woodhead Monroe Ltd Improvements in or relating to shock absorbers
DE3322366A1 (en) * 1983-06-22 1985-01-10 Fichtel & Sachs Ag, 8720 Schweinfurt TWO TUBE VIBRATION DAMPER FOR VEHICLES

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029490A1 (en) * 1990-09-18 1992-03-19 Boge Ag Vehicle hydraulic piston-cylinder vibration damper - has secondary piston fitted in guide tube inside main piston rod
DE102005001743B3 (en) * 2005-01-14 2006-07-06 Zf Friedrichshafen Ag Spring carrier for use between vehicle body and axel part, has threaded spindle with larger inner diameter than cylinder of vibration damper, so that cylinder can be deflected into threaded spindle
EP1681186A1 (en) 2005-01-14 2006-07-19 Zf Friedrichshafen Ag Spring support with adjustable spring plate
EP1681183A2 (en) 2005-01-14 2006-07-19 Zf Friedrichshafen Ag Spring support with adjustable spring plate
DE102015203522A1 (en) * 2015-02-27 2016-09-01 Zf Friedrichshafen Ag Piston rod cylinder unit with an intermediate pipe
CN109780118A (en) * 2019-03-05 2019-05-21 合肥工业大学 A kind of gradual damping shock absorber

Similar Documents

Publication Publication Date Title
DE1263407B (en) Hydraulic buffer
DE2211355A1 (en) PROTECTIVE DEVICE FOR A VEHICLE OCCUPANT
DE7903640U1 (en) Gas spring with two-stage damping
DE2842555C2 (en)
DE1680680A1 (en) Hydropneumatic suspension with automatic level control and vibration damping
DE3110814A1 (en) HYDRAULIC SHOCK ABSORBER FOR DAMPING THE ENERGY OF A MOVING MASS
DE2749945A1 (en) PROCEDURE FOR THE RELEASE OF PRESSURE PULSES IN THE EARTH AND APPROPRIATE DEVICE
DE3732978A1 (en) Device for calming foamed damping medium in shock absorbers
DE3839446C2 (en)
DE2942029A1 (en) Shock and vibration absorber damping fluid - contains graphite and consists of polyglycol ether or ester and/or satd. aromatic or aliphatic carboxylic acid ester
DE2337665C3 (en) Hydraulic twin-tube vibration damper, in particular for vehicles
DE2759435C2 (en) Air springs for automobiles
DE1006672B (en) Hydraulic shock absorber
DE69831118T2 (en) Polygonal container tube for suspension damper
DE570800C (en) Hydro-pneumatic, double-acting shock absorber
EP0510350B1 (en) Method and apparatus for removal of damping fluid from a vibration damper and vibration damper therefor
DE2434053A1 (en) SHOCK ABSORBER
DE2015016B2 (en) Hydrodynamic railway centre buffer coupling damper - has floating piston separating higher pressure spring chamber from intermediate chamber
DE1954331A1 (en) Device for absorbing impact forces, especially for railway wagons
DE2146222C3 (en) Impact absorbers, in particular for motor vehicles, for braking impact impacts on components of vehicles
DE2258129C2 (en) Shock-absorbing buffer, especially elevator buffer
DE2646051A1 (en) Automotive spring shock absorber - has piston connecting rod widened section mounted in chamber with excess pressure valve
DE1958660U (en) SHOCK ABSORBER ELEMENT.
DE735460C (en) Telescopic tube shock absorbers for aircraft
DE1146312B (en) Two-pipe telescopic vibration damper with calmed compensation space, especially for motor vehicles

Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8130 Withdrawal