DE4133188A1 - Sealing unit for pressurised chambers, - is esp. used with pistons and piston rods and consists of sealing rings with leakage chamber between and leakage pipe - Google Patents

Sealing unit for pressurised chambers, - is esp. used with pistons and piston rods and consists of sealing rings with leakage chamber between and leakage pipe

Info

Publication number
DE4133188A1
DE4133188A1 DE19914133188 DE4133188A DE4133188A1 DE 4133188 A1 DE4133188 A1 DE 4133188A1 DE 19914133188 DE19914133188 DE 19914133188 DE 4133188 A DE4133188 A DE 4133188A DE 4133188 A1 DE4133188 A1 DE 4133188A1
Authority
DE
Germany
Prior art keywords
sealing
leakage
line
pistons
ring
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Withdrawn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
DE19914133188
Other languages
German (de)
Inventor
Werner Tischer
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
ZF Friedrichshafen 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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Priority to DE19914133188 priority Critical patent/DE4133188A1/en
Publication of DE4133188A1 publication Critical patent/DE4133188A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
    • B62D5/12—Piston and cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F16J15/004—Sealings comprising at least two sealings in succession forming of recuperation chamber for the leaking fluid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Sealing Devices (AREA)

Abstract

The sealing-unit for sealing pressurised compartments (4, 5) on relatively moving parts, esp. pistons (3) and piston-rods (6) in cylinders (2) of servo-engines (1). A sealing-ring (7) is positioned at each sealing-point. A second sealing-ring (8) is axially spaced apart from the first sealing-ring (7) at the sealing-point. Between the two sealing-rings (7, 8) is a leakage-chamber (10) between the two sealing-rings (7, 8) connected by a leakage pipe (11) to a pressurised container (12). The drainage pipe (11) contains a through-flow indicator (13) between the leakage chamber (10) and the pressurised container (12). USE/ADVANTAGE - The seal indicates any wear on each sealing-ring.

Description

Die Erfindung betrifft eine Dichtungsanordnung zur Abdichtung von Druckräumen an translatorisch relativ zueinander bewegbaren Teilen nach dem Oberbegriff des Anspruches 1. Die Dichtungsanordnung ist insbesondere vorgesehen zur Abdichtung von Kolben und Kolbenstangen in Zylindern von Lenk-Servomotoren, wobei an jeder Dichtstelle ein Dichtring angeordnet ist.The invention relates to a sealing arrangement for Sealing of pressure rooms relative to translational Movable parts according to the preamble of Claim 1. The sealing arrangement is special intended for sealing pistons and piston rods in Cylinders of steering servo motors, at each sealing point a sealing ring is arranged.

Derartige Dichtungsanordnungen sind allgemein bekannt zur Abdichtung zwischen Kolben und Zylindern von Lenk- Servomotoren. Durch Verschleiß eines druckbeaufschlagten Dichtringes vergrößert sich die Leckölmenge über der Dichtstelle langsam, und die mögliche Kraft des Servomotors bzw. seine Arbeitsgeschwindigkeit sinkt langsam ab. Besonders kritisch ist ein derartiger Verschleiß eines Dichtrings mit ansteigender Leckölmenge bei einem Zweikreis-Servomotor einer Lenkanlage. Die Leckverluste können vom Fahrer nicht bemerkt werden, so daß beim Ausfall eines Lenkkreises die gesamte Lenkung versagen kann, wenn unbemerkt die Dichtung des Servomotors des zweiten Lenkkreises zerstört ist.Such sealing arrangements are generally known for sealing between pistons and cylinders of steering Servo motors. By wear of a pressurized Sealing ring increases the amount of leak oil above the Sealing point slowly, and the possible power of the servo motor or its working speed slowly drops. Such wear and tear is particularly critical Sealing rings with increasing amount of leak oil at one Dual circuit servo motor of a steering system. The leakage losses can not be noticed by the driver, so in the event of failure of a steering circuit can fail the entire steering if unnoticed the seal of the second servo motor Steering circle is destroyed.

Der Erfindung liegt die Aufgabe zugrunde, die bekannte Dichtungsanordnung derart zu verbessern, daß ein Verschleiß an jedem Dichtring angezeigt wird.The invention has for its object the known Seal arrangement to improve such that wear is displayed on each sealing ring.

Diese Aufgabe wird durch die im Anspruch 1 gekennzeichnete Dichtungsanordnung gelöst. Vorteilhafte und zweckmäßige Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the in claim 1 marked seal arrangement solved. Beneficial and expedient embodiments of the invention are in the Subclaims specified.

Die Lösung erfolgt insbesondere dadurch, daß an der Dichtstelle zusätzlich in axialem Abstand zu dem einen Dichtring ein zweiter Dichtring angeordnet ist, daß zwischen den beiden Dichtringen ein Leckraum gebildet ist, der über eine Leckleitung an einen Druckmittelbehälter angeschlossen ist, und daß in der Leckleitung zwischen dem Leckraum und dem Druckmittelbehälter ein Durchflußanzeiger angeordnet ist. Durch diese Anordnung kann ein Verschleiß eines Dichtringes über die ansteigende Leckölmenge gemessen und angezeigt werden.The solution is in particular that at the Sealing point also at an axial distance from one Sealing ring a second sealing ring is arranged that between  a leakage space is formed between the two sealing rings a leak line connected to a pressure medium container is, and that in the leakage line between the leakage space and a flow indicator is arranged in the pressure medium container is. This arrangement can wear a Sealing ring measured over the increasing amount of leak oil and are displayed.

Wird in der Leckleitung zwischen dem Leckraum und dem Druckmittelbehälter eine Drosselblende eingebaut, so wird eine Entleerung der Arbeitsräume des Servomotors verzögert, so daß ein schneller Totalausfall verhindert wird.Is in the leak line between the leakage space and the Pressure medium tank a throttle orifice is installed an emptying of the working spaces of the servo motor is delayed, so that a quick total failure is prevented.

Die Erfindung ist nicht auf die Merkmalskombinationen der Ansprüche beschränkt. Für den Fachmann ergeben sich weitere sinnvolle Kombinationsmöglichkeiten von Ansprüchen und einzelnen Anspruchsmerkmalen aus der Aufgabenstellung.The invention is not based on the combinations of features of claims limited. For the person skilled in the art further sensible combinations of requirements and individual claim characteristics from the task.

Im folgenden wird die Erfindung anhand zweier in der Zeichnung dargestellter Ausführungsbeispiele näher erläutert. Es zeigtThe invention is based on two in the Drawing illustrated embodiments closer explained. It shows

Fig. 1 die erfindungsgemäße Dichtungsanordnung an einem Einkreis-Servomotor, Fig. 1 the sealing arrangement according to the invention to a single-loop servo motor,

Fig. 2 die Dichtungsanordnung an einem Zweikreis- Servomotor. Fig. 2 shows the sealing arrangement on a two-circuit servo motor.

Ein Servomotor 1 enthält in einem Zylinder 2 einen axial verschiebbaren Kolben 3, der zwei Druckräume 4 und 5 voneinander trennt. Der Kolben 3 ist mit einer Kolbenstange 6 verbunden, die eine Bewegung des Kolbens 3 auf nicht dargestellte, zu verstellende Teile, beispielsweise zu lenkende Fahrzeugräder, überträgt. Am Außenumfang des Kolbens 3 sind in axialem Abstand voneinander zwei Dichtringe 7 und 8 angeordnet. Zwischen den beiden Dichtringen 7 und 8 ist ein Leckraum 10 angeordnet, der in der Zeichnung durch eine Ringnut angedeutet ist. Von dem Leckraum 10 geht durch den Kolben 3 und die Kolbenstange 6 eine Leckleitung 11, deren Fortsetzung außerhalb der Kolbenstange zu einem Druckmittelbehälter 12 führt. In der Leckleitung ist zwischen dem Leckraum 10 und dem Druckmittelbehälter 12 ein Durchflußanzeiger 13 angeordnet. Eine Drosselblende 14 ist in der Leckleitung 11 angeordnet, zweckmäßigerweise in der Kolbenstange 6.In a cylinder 2, a servomotor 1 contains an axially displaceable piston 3 , which separates two pressure chambers 4 and 5 from one another. The piston 3 is connected to a piston rod 6 , which transmits a movement of the piston 3 to parts, not shown, to be adjusted, for example vehicle wheels to be steered. On the outer circumference of the piston 3 , two sealing rings 7 and 8 are arranged at an axial distance from one another. A leakage space 10 is arranged between the two sealing rings 7 and 8, which is indicated in the drawing by an annular groove. From the leakage space 10 , a leak line 11 passes through the piston 3 and the piston rod 6 , the continuation of which leads outside the piston rod to a pressure medium container 12 . A flow indicator 13 is arranged in the leakage line between the leakage space 10 and the pressure medium container 12 . A throttle orifice 14 is arranged in the leak line 11 , expediently in the piston rod 6 .

Am Austritt der Kolbenstange 6 aus dem Zylinder 2 sind in einem Abschlußdeckel 15 in axialem Abstand voneinander zwei Dichtringe 16 und 17 mit einem dazwischenliegenden Leckraum 18 angeordnet. Der Leckraum 18 ist durch eine Leckleitung 11A mit der Leckleitung 11 und damit über den Durchflußanzeiger 13 mit dem Druckmittelbehälter 12 verbunden. In der Leckleitung 11A ist eine Drosselblende 14A angeordnet. Anstelle der beiden Drosselblenden 14 und 14A kann eine gemeinsame Drosselblende direkt vor dem Durchflußanzeiger 13 in einem gemeinsamen Teilstück der Leckleitungen 11 und 11A angeordnet sein.At the outlet of the piston rod 6 from the cylinder 2 , two sealing rings 16 and 17 with an intervening leakage space 18 are arranged in an end cover 15 at an axial distance from one another. The leakage chamber 18 is connected through a leakage line 11 A with the leakage line 11 and thus through the flow indicator 13 with the pressure fluid reservoir 12th A throttle diaphragm 14 A is arranged in the leakage line 11 A. Instead of the two orifice plates 14 and 14 A, a common orifice plate can be arranged directly in front of the flow indicator 13 in a common section of the leak lines 11 and 11 A.

Das Ausführungsbeispiel der Fig. 2 entspricht im wesentlichen dem Beispiel der Fig. 1. Einander entsprechende Teile sind deshalb in beiden Figuren mit den gleichen Bezugszahlen bezeichnet. Die entsprechenden Teile des in Fig. 2 rechten Teiles des Zweikreis-Servomotors sind mit entsprechenden, jedoch um 30 erhöhten Bezugszahlen bezeichnet.The exemplary embodiment in FIG. 2 essentially corresponds to the example in FIG. 1. Parts that correspond to one another are therefore designated with the same reference numbers in both figures. The corresponding parts of the right-hand part of the two-circuit servo motor in FIG. 2 are designated by corresponding reference numerals, however, increased by 30.

In diesem Ausführungsbeispiel sind zusätzlich in einer Zylinderwand 20, die zwischen dem Druckraum 5 des linken Servomotors 1 und dem Druckraum 34 des rechten Servomotors 31 angeordnet ist, zwei Dichtringe 21 und 22 mit einem dazwischenliegenden Leckraum 23 angeordnet. Der Leckraum 23 ist durch eine Leckleitung 11B mit der Leckleitung 11 und damit über den Durchflußanzeiger 13 mit dem Druckmittelbehälter 12 verbunden. An der Leckleitung 11B ist eine Drosselblende 14B angeordnet.In this exemplary embodiment, two sealing rings 21 and 22 with an intermediate leakage space 23 are additionally arranged in a cylinder wall 20 which is arranged between the pressure space 5 of the left servo motor 1 and the pressure space 34 of the right servo motor 31 . The leakage chamber 23 is connected through a leakage line 11 B with the leakage line 11 and thus through the flow indicator 13 with the pressure fluid reservoir 12th A throttle diaphragm 14 B is arranged on the leak line 11 B.

Die Kolben 3 und 33 der beiden Servomotoren 1 und 31 sind beispielsweise durch Sprengringe 24 auf der Kolbenstange 6 in axialer Richtung gehalten. Zwischen den Kolben 3 und 33 und der Kolbenstange sind je zwei Dichtringe 25, 26 bzw. 27, 28 mit dazwischenliegendem Leckraum 29 bzw. 30 angeordnet. Die Leckräume 29 und 30 sind ebenfalls über die Leckleitung 11 und den Durchflußanzeiger 13 an den Druckmittelbehälter 12 angeschlossen.The pistons 3 and 33 of the two servomotors 1 and 31 are held in the axial direction, for example, by snap rings 24 on the piston rod 6 . Between the pistons 3 and 33 and the piston rod, two sealing rings 25 , 26 and 27 , 28 with an intervening leakage space 29 and 30 are arranged. The leak spaces 29 and 30 are also connected to the pressure medium container 12 via the leak line 11 and the flow indicator 13 .

Die Drosselblenden 14, 14A, 14B, 44A, die in der Kolbenstange 6, den Abschlußdeckeln 15 bzw. 45 bzw. in der Zylinderwand 20 angeordnet sind, können ersetzt werden durch eine einzige Drosselblende, die in einem gemeinsamen Teilstück der Leckleitung 11, 11A, 11B, 41A direkt vor dem Durchflußanzeiger 13 angeordnet ist.The throttle orifices 14 , 14 A, 14 B, 44 A, which are arranged in the piston rod 6 , the end caps 15 or 45 or in the cylinder wall 20 , can be replaced by a single throttle orifice which is in a common section of the leakage line 11 , 11 A, 11 B, 41 A is arranged directly in front of the flow indicator 13 .

Bei einem Verschleiß oder beim Ausfall eines der Dichtringe 7, 8, 16, 17, 21, 22, 25, 26, 27, 28, 37, 38, 46, 47 fließt Lecköl über die Leckleitung 11, 11A zum Druckmittelbehälter 12. Die Leckölmenge wird dabei mit Hilfe des Durchflußanzeigers 13 angezeigt, so daß der Schaden an einem oder mehreren der Dichtringe angezeigt wird. In the event of wear or failure of one of the sealing rings 7 , 8 , 16 , 17 , 21 , 22 , 25 , 26 , 27 , 28 , 37 , 38 , 46 , 47 , leakage oil flows via the leakage line 11 , 11 A to the pressure medium container 12 . The amount of leakage oil is displayed with the aid of the flow indicator 13 , so that the damage to one or more of the sealing rings is indicated.

BezugszeichenReference numerals

 1, 31 Servomotor
 2 Zylinder
 3, 33 Kolben
 4, 34 Druckraum
 5, 35 Druckraum
 6 Kolbenstange
 7, 37 Dichtring
 8, 38 Dichtring
 9 -
10, 40 Leckraum
11, 11A, 11B, 41A Leckleitung
12 Druckmittelbehälter
13 Durchflußanzeiger
14, 14A, 14B, 44A Drosselblende
15, 45 Abschlußdeckel
16, 46 Dichtring
17, 47 Dichtring
18, 48 Leckraum
19 -
20 Zylinderwand
21 Dichtring
22 Dichtring
23 Leckraum
24 Sprengring
25 Dichtring
26 Dichtring
27 Dichtring
28 Dichtring
29 Leckraum
30 Leckraum 1, 31 servo motor
2 cylinders
3, 33 pistons
4, 34 pressure room
5, 35 pressure room
6 piston rod
7, 37 sealing ring
8, 38 sealing ring
9 -
10, 40 leakage space
11, 11 A, 11 B, 41 A leakage line
12 pressure medium container
13 flow indicators
14, 14 A, 14 B, 44 A restrictor
15, 45 end cover
16, 46 sealing ring
17, 47 sealing ring
18, 48 leakage space
19 -
20 cylinder wall
21 sealing ring
22 sealing ring
23 leakage space
24 snap ring
25 sealing ring
26 sealing ring
27 sealing ring
28 sealing ring
29 leakage space
30 leakage space

Claims (5)

1. Dichtungsanordnung zur Abdichtung von Druckräumen (4, 5, 34, 35) an translatorisch relativ zueinander bewegbaren Teilen, insbesondere von Kolben (3, 33) und Kolbenstangen (6) in Zylindern (2) von Lenk- Servomotoren (1), wobei an jeder Dichtstelle ein Dichtring (7, 16, 21, 25, 27, 37, 46) angeordnet ist, dadurch gekennzeichnet,
  • - daß an der Dichtstelle zusätzlich in axialem Abstand zu dem einen Dichtring (7, 16, 21, 25, 27, 37, 46) ein zweiter Dichtring (8, 17, 22, 26, 28, 38, 47) angeordnet ist,
  • - daß zwischen den beiden Dichtringen (7, 8, 16, 17, 21, 22, 25, 26, 27, 28, 37, 38, 46, 47) ein Leckraum (10, 18, 29, 30, 40, 48) gebildet ist, der über eine Leckleitung (11, 11A, 11B, 41B) an einen Druckmittelbehälter (12) angeschlossen ist, und
  • - daß in der Leckleitung (11, 11A, 11B, 41B) zwischen dem Leckraum (10, 18, 29, 30, 40, 48) und dem Druckmittelbehälter (12) ein Durchflußanzeiger (13) angeordnet ist.
1. Sealing arrangement for sealing pressure chambers ( 4 , 5 , 34 , 35 ) on parts which can be moved in translation relative to one another, in particular of pistons ( 3 , 33 ) and piston rods ( 6 ) in cylinders ( 2 ) of steering servomotors ( 1 ), wherein a sealing ring ( 7 , 16 , 21 , 25 , 27 , 37 , 46 ) is arranged at each sealing point, characterized in that
  • that a second sealing ring ( 8 , 17 , 22 , 26 , 28 , 38 , 47 ) is additionally arranged at an axial distance from the one sealing ring ( 7 , 16 , 21 , 25 , 27 , 37 , 46 ),
  • - That between the two sealing rings ( 7 , 8 , 16 , 17 , 21 , 22 , 25 , 26 , 27 , 28 , 37 , 38 , 46 , 47 ) there is a leakage space ( 10 , 18 , 29 , 30 , 40 , 48 ) is formed, which is connected via a leak line ( 11 , 11 A, 11 B, 41 B) to a pressure medium container ( 12 ), and
  • - That in the leak line ( 11 , 11 A, 11 B, 41 B) between the leakage space ( 10 , 18 , 29 , 30 , 40 , 48 ) and the pressure medium container ( 12 ) a flow indicator ( 13 ) is arranged.
2. Dichtungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Leckleitung (11), in der Kolbenstange (6) angeordnet ist.2. Sealing arrangement according to claim 1, characterized in that the leakage line ( 11 ) is arranged in the piston rod ( 6 ). 3. Dichtungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Leckleitung (11A, 41A) in einem Abschlußdeckel (15, 45) des Zylinders (2) angeordnet ist. 3. Sealing arrangement according to claim 1, characterized in that the leak line ( 11 A, 41 A) is arranged in an end cover ( 15 , 45 ) of the cylinder ( 2 ). 4. Dichtungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Leckleitung (11B) in einer Zylinderwand (20) angeordnet ist, die in einem Zweikreis-Servomotor zwischen zwei Servomotoren (1, 31) angeordnet ist.4. Sealing arrangement according to claim 1, characterized in that the leakage line ( 11 B) is arranged in a cylinder wall ( 20 ) which is arranged in a two-circuit servo motor between two servo motors ( 1 , 31 ). 5. Dichtungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß in der Leckleitung (11, 11A, 11B, 41A) zwischen dem Leckraum (10, 18, 29, 30, 40, 48) und dem Druckmittelbehälter (12) eine Drosselblende (14, 14A, 14B, 44A) eingebaut ist.5. Sealing arrangement according to claim 1, characterized in that in the leakage line ( 11 , 11 A, 11 B, 41 A) between the leakage space ( 10 , 18 , 29 , 30 , 40 , 48 ) and the pressure medium container ( 12 ) has a throttle orifice ( 14 , 14 A, 14 B, 44 A) is installed.
DE19914133188 1990-10-08 1991-10-04 Sealing unit for pressurised chambers, - is esp. used with pistons and piston rods and consists of sealing rings with leakage chamber between and leakage pipe Withdrawn DE4133188A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19914133188 DE4133188A1 (en) 1990-10-08 1991-10-04 Sealing unit for pressurised chambers, - is esp. used with pistons and piston rods and consists of sealing rings with leakage chamber between and leakage pipe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4031805 1990-10-08
DE19914133188 DE4133188A1 (en) 1990-10-08 1991-10-04 Sealing unit for pressurised chambers, - is esp. used with pistons and piston rods and consists of sealing rings with leakage chamber between and leakage pipe

Publications (1)

Publication Number Publication Date
DE4133188A1 true DE4133188A1 (en) 1992-04-09

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19521101A1 (en) * 1995-06-09 1996-12-12 Rexroth Mannesmann Gmbh Hydraulic pressure intensifier unit, in particular for a press working according to the hydroforming process
DE19801327A1 (en) * 1998-01-16 1999-07-22 Rolf Hermanns Fluid operated rotary actuator with hydraulically or pneumatically operated piston
DE19906698A1 (en) * 1999-02-18 2000-08-31 Schuler Smg Gmbh & Co Kg Piston and cylinder device, with sealing ring against axial sealing surfaces of cylinder and sealing bush
EP1046570A2 (en) * 1999-04-22 2000-10-25 Volkswagen Aktiengesellschaft Hydraulic actuating device for actuating the steering of motor vehicles
WO2004044437A1 (en) * 2002-11-12 2004-05-27 National Oilwell Norway As Draining of oil leak in a hydraulic cylinder
EP1602832A1 (en) * 2004-06-02 2005-12-07 Tecnica dell'aria S.r.l. Double-acting operating cylinder
EP2014927A1 (en) * 2007-06-04 2009-01-14 MAGNETI MARELLI POWERTRAIN S.p.A. An actuation system for a servo-assisted mechanical transmission with oil leakage recovery
CN102705298A (en) * 2012-07-09 2012-10-03 杨志勤 Hydraulic reciprocating seal leakage recovery device
US20130180397A1 (en) * 2010-09-27 2013-07-18 Snecma Hydraulic device of a control device, such as a blade pitch-change device
WO2017123400A1 (en) * 2016-01-11 2017-07-20 Parker-Hannifin Corporation Optical sensor mounting interface with integrated hydraulic vent
WO2018015022A1 (en) * 2016-07-19 2018-01-25 Liebherr-Aerospace Lindenberg Gmbh Hydraulic flight control actuator having a double seal device and defined leakage
US10669930B2 (en) 2015-08-10 2020-06-02 Avl List Gmbh Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve
US10738690B2 (en) 2016-07-06 2020-08-11 Avl List Gmbh Connecting rod having an adjustable connecting rod length with a mechanical actuating means
US10876474B2 (en) 2016-05-31 2020-12-29 Avl List Gmbh Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine
US10954849B2 (en) 2015-12-14 2021-03-23 Avl List Gmbh Length-adjustable connecting rod with electromagnetically-actuatable switching valve
CN112879384A (en) * 2021-01-13 2021-06-01 一重集团大连工程技术有限公司 Ultrahigh pressure oil cylinder for compensating sealing clearance by using annular groove structure
US11066987B2 (en) 2017-02-24 2021-07-20 Avl List Gmbh Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19521101A1 (en) * 1995-06-09 1996-12-12 Rexroth Mannesmann Gmbh Hydraulic pressure intensifier unit, in particular for a press working according to the hydroforming process
DE19801327A1 (en) * 1998-01-16 1999-07-22 Rolf Hermanns Fluid operated rotary actuator with hydraulically or pneumatically operated piston
DE19906698B4 (en) * 1999-02-18 2007-05-03 Schuler Smg Gmbh & Co. Kg Piston-cylinder device
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