DE102007023088A1 - Vibration damper for motor vehicle, has internal piston rod sealed opposite to hollow piston rod by inner hydraulic seal, where inner hydraulic seal exhibits small breaking force than outer hydraulic seal - Google Patents
Vibration damper for motor vehicle, has internal piston rod sealed opposite to hollow piston rod by inner hydraulic seal, where inner hydraulic seal exhibits small breaking force than outer hydraulic seal Download PDFInfo
- Publication number
- DE102007023088A1 DE102007023088A1 DE200710023088 DE102007023088A DE102007023088A1 DE 102007023088 A1 DE102007023088 A1 DE 102007023088A1 DE 200710023088 DE200710023088 DE 200710023088 DE 102007023088 A DE102007023088 A DE 102007023088A DE 102007023088 A1 DE102007023088 A1 DE 102007023088A1
- Authority
- DE
- Germany
- Prior art keywords
- piston rod
- hydraulic seal
- piston
- vibration damper
- hollow
- 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- Withdrawn
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
- F16F9/32—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
- F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
-
- 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
- F16F9/182—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 comprising a hollow piston rod
-
- 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
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/362—Combination of sealing and guide arrangements for piston rods
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft einen Schwingungsdämpfer, insbesondere einen Schwingungsdämpfer für ein Kraftfahrzeug mit einem Kolben-Zylinderaggregat gemäß dem Oberbegriff des Anspruchs 1.The The present invention relates to a vibration damper, in particular a vibration damper for a Motor vehicle with a piston-cylinder unit according to the preamble of claim 1.
Bei Schwingungsdämpfern innerhalb eines Kraftfahrzeuges ist es seit langem bekannt, dass es beim Auftreten des so genannten „Stick-Slip-Effektes" zwischen einer Kolbenstangendichtung und einer Kolbenstange, insbesondere bei kleinen Fahrbahnunebenheiten zu Komforteinbußen kommt. Dies liegt insbesondere darin begründet, dass beim Federungsvorgang eine nicht unerhebliche Losbrechkraft zwischen der Kolbenstange einerseits und der Kolbenstangendichtung andererseits überwunden werden muss, wobei für die Größe der Losbrechkraft maßgebend eine relativ hohe Haftreibung ist, die bei der Kolbenstangenbewegung überwunden werden muss. Da bis zur Überwindung der Losbrechkraft die Kolbenstange nur eine kleine Wegstrecke mit einer geringen Geschwindigkeit beim Federungsvorgang zurücklegt, kann der Schwingungsdämpfer nur eine unbedeutende Dämpfwirkung erreichen, wobei unmittelbar nach dem Überwinden der Losbrechkraft die Kolbenstange in eine Gleitreibungsphase übergeht und aufgrund einer verminderten Reaktionskraft auf die Kolbenstange eine Beschleunigung erfährt, die mit einem plötzlichen Anstieg der Dämpfkraft verbunden ist. Letzteres wird dabei oftmals als unkomfortabler Stoß empfunden.at vibration Within a motor vehicle, it has long been known that when the so-called "stick-slip effect" occurs between a piston rod seal and a piston rod, especially for small road bumps to loss of comfort comes. This is due in particular to the fact that during the suspension process a not inconsiderable breakout force between the piston rod on the one hand and the piston rod seal on the other hand overcome must be, where for the size of the breakaway force a relatively high static friction is overcome in the piston rod movement must become. There to overcome the breakout force the piston rod with only a small distance travels at a low speed during the suspension process, can the vibration damper only an insignificant damping effect achieve, immediately after overcoming the breakout force the Piston rod goes into a sliding friction phase and due to a decreased reaction force on the piston rod an acceleration learns that with a sudden Increase in damping force connected is. The latter is often perceived as an uncomfortable shock.
Aus
der
Die Erfindung beschäftigt sich mit dem Problem, einen gattungsgemäßen Schwingungsdämpfer dahingehend zu verbessern, dass durch eine Losbrechkraft einer Dichtung an einer Kolbenstange auftretende Komforteinbußen zumindest reduziert werden.The Invention busy with the problem of a generic vibration damper to the effect to improve that by a breakaway force of a seal on a Piston rod occurring comfort losses are at least reduced.
Diese Aufgabe wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs 1 gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.These The object is achieved by the Subject of the independent Claim 1 solved. Advantageous embodiments are the subject of the dependent Claims.
Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, einen Schwingungsdämpfer mit einem äußeren und einem inneren Kolben-Zylinderaggregat auszustatten, wobei ein Kolben bzw. eine Kolbenstange des äußeren Kolben-Zylinderaggregates zugleich den Zylinder des inneren Kolben-Zylinderaggregates bildet, in welchem eine innere Kolbenstange bzw. ein innerer Kolben verstellbar gelagert sind. Die Kolbenstange, im weiteren oftmals auch als äußere Kolbenstange bezeichnet, und der Kolben sind dabei hohl ausgebildet, so dass in deren Hohlräumen die weitere, nämlich innere Dämpfereinrichtung Platz findet. Dabei ist die innere Kolbenstange gegenüber der Hohlkolbenstange über eine vergleichsweise kleine Dichtung hydraulisch abgedichtet, wodurch eine Losbrechkraft insbesondere bei geringen Fahrbahnunebenheiten deutlich reduziert werden kann. Die steigert den Fahrkomfort. Von besonderem Vorteil bei diesem Schwingungsdämpferkonzept ist darüber hinaus, dass die innere Dämpfereinrichtung lediglich optional, insbesondere bei höherpreisigen Fahrzeugen einsetzbar ist, so dass beispielsweise je nach Ausstattungslinie der erfindungsgemäße Schwingungsdämpfer entweder als konventioneller Schwingungsdämpfer, das heißt ohne innere Dämpfereinrichtung, oder als Komfort-Schwingungsdämpfer, das heißt mit innerer Dämpfereinrichtung eingesetzt werden kann.The The present invention is based on the general idea, a Vibration damper with an outer and to equip an inner piston-cylinder unit, wherein a piston or a piston rod of the outer piston-cylinder unit at the same time forms the cylinder of the inner piston-cylinder unit, in which an inner piston rod or an inner piston mounted adjustable are. The piston rod, in the other often as an outer piston rod designated, and the piston are hollow, so that in their cavities the others, namely inner damper device Takes place. The inner piston rod is opposite to the Hollow piston rod over a comparatively small seal hydraulically sealed, thereby a breakout force especially at low road bumps can be significantly reduced. This increases ride comfort. From particular advantage of this vibration damper concept is, moreover, that the inner damper device only optional, especially for higher priced vehicles used is, so that, for example, depending on the equipment line of the vibration damper according to the invention either as a conventional vibration damper, this means without inner damper device, or as a comfort vibration damper, this means used with inner damper device can be.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus der Zeichnung und aus der zugehörigen Figurenbeschreibung anhand der Zeichnung.Further important features and advantages of the invention will become apparent from the Dependent claims, from the drawing and the associated Description of the figures with reference to the drawing.
Ferner kann radseitig – d.h. auf dem dem Fahrzeugrad zugeordneten Endbereich – in dem inneren Kolben wenigstens ein Dämpferventil angeordnet ist. Das Dämpferventil ist nur am inneren Kolben angebracht. Dadurch wird erreicht, dass dann, wenn sich nur der innere Kolben bewegt, die Dämpfungswirkung geringer ist, als bei einer gleichzeitigen Bewegung des äußeren, hohlen Kolbens und des inneren Kolbens. Vorteilhafterweise hat die Kolbenfläche des inneren Kolbens etwa einen Anteil von zwei Dritteln an der Gesamtkolbenfläche beider Kolben.Further can be wheel-side - i. on the vehicle wheel associated end region - in the inner piston at least a damper valve is arranged. The damper valve is only attached to the inner piston. This ensures that then, when only the inner piston moves, the damping effect is less than a simultaneous movement of the outer, hollow Piston and the inner piston. Advantageously, the piston surface of the inner piston about a proportion of two-thirds of the total piston area of both Piston.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It it is understood that the above and the following yet to be explained features not only in the specified combination, but also in other combinations or alone, without to leave the scope of the present invention.
Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert.One preferred embodiment The invention is illustrated in the drawing and will be described in the following Description closer explained.
Die
einzige
Entsprechend
Um
insbesondere bei geringen Fahrbahnunebenheiten ein unangenehmes
Stoßen
innerhalb des Schwingungsdämpfers
Die
innere Kolbenstange
Im
inneren Kolben
Generell
kann durch den erfindungsgemäßen Schwingungsdämpfer
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710023088 DE102007023088A1 (en) | 2007-05-16 | 2007-05-16 | Vibration damper for motor vehicle, has internal piston rod sealed opposite to hollow piston rod by inner hydraulic seal, where inner hydraulic seal exhibits small breaking force than outer hydraulic seal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710023088 DE102007023088A1 (en) | 2007-05-16 | 2007-05-16 | Vibration damper for motor vehicle, has internal piston rod sealed opposite to hollow piston rod by inner hydraulic seal, where inner hydraulic seal exhibits small breaking force than outer hydraulic seal |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102007023088A1 true DE102007023088A1 (en) | 2007-12-27 |
Family
ID=38721323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200710023088 Withdrawn DE102007023088A1 (en) | 2007-05-16 | 2007-05-16 | Vibration damper for motor vehicle, has internal piston rod sealed opposite to hollow piston rod by inner hydraulic seal, where inner hydraulic seal exhibits small breaking force than outer hydraulic seal |
Country Status (1)
Country | Link |
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DE (1) | DE102007023088A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008008007A1 (en) | 2008-02-07 | 2009-08-13 | Daimler Ag | Vibration damper, particularly for wheel-guiding spring strut of motor vehicle, has damping device with piston arranged in axially adjustable manner in working chamber of cylinder |
DE102022100397A1 (en) | 2022-01-10 | 2023-07-13 | Industrial Science GmbH powered by IAV | absorber device and damper device |
-
2007
- 2007-05-16 DE DE200710023088 patent/DE102007023088A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008008007A1 (en) | 2008-02-07 | 2009-08-13 | Daimler Ag | Vibration damper, particularly for wheel-guiding spring strut of motor vehicle, has damping device with piston arranged in axially adjustable manner in working chamber of cylinder |
DE102022100397A1 (en) | 2022-01-10 | 2023-07-13 | Industrial Science GmbH powered by IAV | absorber device and damper device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
8127 | New person/name/address of the applicant |
Owner name: DAIMLER AG, 70327 STUTTGART, DE |
|
R120 | Application withdrawn or ip right abandoned |
Effective date: 20130525 |