EP0586995B1 - Cylinder for hydraulic and/or pneumatic installations - Google Patents

Cylinder for hydraulic and/or pneumatic installations Download PDF

Info

Publication number
EP0586995B1
EP0586995B1 EP93113797A EP93113797A EP0586995B1 EP 0586995 B1 EP0586995 B1 EP 0586995B1 EP 93113797 A EP93113797 A EP 93113797A EP 93113797 A EP93113797 A EP 93113797A EP 0586995 B1 EP0586995 B1 EP 0586995B1
Authority
EP
European Patent Office
Prior art keywords
ring
cylinder
piston
sliding ring
groove
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.)
Revoked
Application number
EP93113797A
Other languages
German (de)
French (fr)
Other versions
EP0586995A1 (en
Inventor
Andreas Kühberger
Ewald Kohberg
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6467582&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0586995(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Publication of EP0586995A1 publication Critical patent/EP0586995A1/en
Application granted granted Critical
Publication of EP0586995B1 publication Critical patent/EP0586995B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies

Definitions

  • the invention relates to a cylinder for hydraulic and / or pneumatic systems, in particular for motor vehicles, consisting of a housing with an axial bore in which a piston is axially displaceably guided and pressurized with pressure medium on one end face, the cylinder having at least a connection for at least one pressure line is provided and that the piston is sealed off from the cylinder via at least one grooved ring and is guided on its outer surface between the grooved ring and its pressure-side end face via a slide ring.
  • Cylinders for hydraulic systems are known (e.g. DE-OS 38 16 608) in which the cylinder is provided with a connection for the pressure medium line and in which the piston is provided with at least one groove ring for sealing the piston against the cylinder wall.
  • a grooved ring is suitable at high pressures, but has the disadvantage that high actuation forces also have to overcome high frictional forces with respect to the cylinder.
  • the object of the invention is to develop a cylinder for hydraulic systems so that even at high Operating pressures without significant additional costs, a reduction in friction of the components that can be moved relative to one another and thus an improvement in the efficiency can be achieved.
  • the invention provides that the slide ring is mounted radially on the inside on an O-ring.
  • the slide ring supports or supports the piston relative to the cylinder wall and thus tilting or additional friction can be avoided. Furthermore, the preload of the slide ring can advantageously be set in a defined manner.
  • An essential embodiment of the invention provides that the slide ring is arranged in a separate groove.
  • the slide ring consists of a slide bearing material, e.g. Metals and / or plastics conceivable.
  • the slide ring and the grooved ring are arranged on a step-shaped, cylindrical section having different diameters, which is particularly favorable in terms of production technology.
  • the slide ring and the groove ring can be separated from one another by a disk arranged in the groove.
  • the cylinder shown in Figure 1 consists essentially of the housing 6 and the piston 1.
  • the housing 6 is provided with a connection for a pressure medium line, and with fastening connections.
  • the piston 1 is guided in an axially displaceable manner and hydraulic fluid is applied to its end face 7.
  • the piston 1 provides a groove 2 in a first groove, which is used to seal the piston 1 from the cylinder.
  • a slide ring 3 is arranged together with an O-ring 9 in a further groove 4.
  • the slide ring 3 is supported on the cylinder wall, it seals at the same time and receives the necessary preload through the radially inner O-ring 5.
  • the slide ring 3 reduces the high operating pressure compared to the groove ring 2, so that a reduction in friction is achieved becomes.
  • a piston 1 can be seen as an individual part from FIG. 2, which is equipped with a grooved ring 2.
  • the groove 4 there are first the O-ring 5 and then the slide ring 3 when viewed radially from the inside.

Description

Die Erfindung bezieht sich auf einen Zylinder für hydraulische und/oder pneumatische Anlagen, insbesondere für Kraftfahrzeuge, bestehend aus einem Gehäuse mit einer axialen Bohrung, in der ein Kolben axial verschiebbar geführt und auf der einen Stirnseite mit Druckmedium beaufschlagt ist, wobei der Zylinder mit mindestens einem Anschluß für mindestens eine Druckleitung versehen ist und daß der Kolben gegenüber dem Zylinder über mindestens einen Nutring abgedichtet und auf seiner Außenfläche zwischen dem Nutring und seiner druckseitig verlaufenden Stirnseite über einen Gleitring geführt ist.The invention relates to a cylinder for hydraulic and / or pneumatic systems, in particular for motor vehicles, consisting of a housing with an axial bore in which a piston is axially displaceably guided and pressurized with pressure medium on one end face, the cylinder having at least a connection for at least one pressure line is provided and that the piston is sealed off from the cylinder via at least one grooved ring and is guided on its outer surface between the grooved ring and its pressure-side end face via a slide ring.

Es sind Zylinder für hydraulische Anlagen bekannt (z.B. DE-OS 38 16 608 ), bei denen der Zylinder mit einem Anschluß für die Druckmittelleitung versehen ist und bei denen der Kolben mit mindestens einem Nutring zur Abdichtung des Kolbens gegenüber der Zylinderwandung versehen ist. Ein derartiger Nutring eignet sich bei hohen Drücken, hat jedoch den Nachteil, daß bei hohen Betätigungskräften auch hohe Reibungskräfte gegenüber dem Zylinder zu überwinden sind.Cylinders for hydraulic systems are known (e.g. DE-OS 38 16 608) in which the cylinder is provided with a connection for the pressure medium line and in which the piston is provided with at least one groove ring for sealing the piston against the cylinder wall. Such a grooved ring is suitable at high pressures, but has the disadvantage that high actuation forces also have to overcome high frictional forces with respect to the cylinder.

Alternativ wären servounterstützte Zylinder denkbar, die allerdings beim Kunden zu erheblichen Mehrkosten führen würden.Alternatively, servo-assisted cylinders would be conceivable, but this would lead to considerable additional costs for the customer.

Aufgabe der Erfindung ist es, einen Zylinder für hydraulische Anlagen so weiterzubilden, daß auch bei hohen Betriebsdrücken ohne wesentliche Mehrkosten eine Reibungsreduzierung der zueinander bewegbaren Bauteile und damit eine Verbesserung des Wirkungsgrades erzielbar ist.The object of the invention is to develop a cylinder for hydraulic systems so that even at high Operating pressures without significant additional costs, a reduction in friction of the components that can be moved relative to one another and thus an improvement in the efficiency can be achieved.

Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, daß der Gleitring radial innen auf einem O-Ring gelagert ist.To achieve this object, the invention provides that the slide ring is mounted radially on the inside on an O-ring.

Vorteilhaft ist bei dieser Ausbildung, daß der Betriebsdruck zunächst auf dem Gleitring anliegt der dann einen Druckabbau gegenüber dem Nutring bewirkt. Hierdurch werden die Anpresskräfte des Nutringes herabgesetzt, so daß der Wirkungsgrad und die Reibungsverhältnisse verbessert werden.It is advantageous with this design that the operating pressure is initially applied to the sliding ring, which then causes a pressure reduction compared to the grooved ring. As a result, the contact forces of the grooved ring are reduced, so that the efficiency and the friction conditions are improved.

Darüber hinaus ist von Vorteil, daß der Gleitring den Kolben gegenüber der Zylinderwandung abstützt bzw. lagert und somit ein Verkanten bzw. eine zusätzliche Reibung vermieden werden kann. Desweiteren läßt sich in vorteilhafter Weise die Vorspannung des Gleitringes definiert einstellen.In addition, it is advantageous that the slide ring supports or supports the piston relative to the cylinder wall and thus tilting or additional friction can be avoided. Furthermore, the preload of the slide ring can advantageously be set in a defined manner.

Eine wesentliche Ausgestaltung der Erfindung sieht vor, daß der Gleitring in einer separaten Nut angeordnet ist.An essential embodiment of the invention provides that the slide ring is arranged in a separate groove.

Eine weitere Ausführungsform sieht vor, daß der Gleitring aus einem Gleitlagerwerkstoff besteht, dabei sind z.B. Metalle und/oder Kunststoffe denkbar.Another embodiment provides that the slide ring consists of a slide bearing material, e.g. Metals and / or plastics conceivable.

Bei Anwendung nur einer Nut ist vorgesehen, daß der Gleitring sich direkt an einer Schulter des Nutringes abstützt.If only one groove is used, it is provided that the slide ring is supported directly on a shoulder of the groove ring.

Fertigungstechnisch besonders günstig sind der Gleitring und der Nutring auf einem stufenförmigen, unterschiedliche Durchmesser aufweisenden, zylindrischen Absatz angeordnet.The slide ring and the grooved ring are arranged on a step-shaped, cylindrical section having different diameters, which is particularly favorable in terms of production technology.

Bei Verwendung von einer Nut läßt sich der Gleitring und der Nutring durch eine in der Nut angeordnete Scheibe voneinander trennen.When using a groove, the slide ring and the groove ring can be separated from one another by a disk arranged in the groove.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen schematisch dargestellt.Preferred embodiments of the invention are shown schematically in the drawings.

Es zeigt:

  • Figur 1 einen Zylinder für eine hydraulische Anlage im Schnitt
  • Figur 2 einen Kolben als Einzelteil.
It shows:
  • Figure 1 shows a cylinder for a hydraulic system in section
  • Figure 2 shows a piston as a single part.

Der in Figur 1 dargestellte Zylinder besteht im wesentlichen aus dem Gehäuse 6 und dem Kolben 1. Das Gehäuse 6 ist mit einem Anschluß für eine Druckmittelleitung, und mit Befestigungsanschlüssen versehen. Der Kolben 1 ist axial verschiebbar geführt und auf seiner Stirnseite 7 mit hydraulischer Flüssigkeit beaufschlagt.The cylinder shown in Figure 1 consists essentially of the housing 6 and the piston 1. The housing 6 is provided with a connection for a pressure medium line, and with fastening connections. The piston 1 is guided in an axially displaceable manner and hydraulic fluid is applied to its end face 7.

Der Kolben 1 sieht in einer ersten Nut einen Nutring 2 vor, der der Abdichtung des Kolbens 1 gegenüber dem Zylinder dient. Zwischen dem Nutring 2 und der Stirnseite 7 des Kolbens 1 ist in einer weiteren Nut 4 ein Gleitring 3 zusammen mit einem O-Ring 9 angeordnet. Der Gleitring 3 stützt sich an der Zylinderwandung ab, dabei dichtet er gleichzeitig ab und erhält die notwendige Vorspannung durch den radial innen vorgesehenen O-Ring 5. Der Gleitring 3 baut den hohen Betriebsdruck gegenüber dem Nutring 2 ab, so daß eine Verminderung der Reibung erreicht wird.The piston 1 provides a groove 2 in a first groove, which is used to seal the piston 1 from the cylinder. Between the groove ring 2 and the end face 7 of the piston 1, a slide ring 3 is arranged together with an O-ring 9 in a further groove 4. The slide ring 3 is supported on the cylinder wall, it seals at the same time and receives the necessary preload through the radially inner O-ring 5. The slide ring 3 reduces the high operating pressure compared to the groove ring 2, so that a reduction in friction is achieved becomes.

Aus der Figur 2 ist als Einzelteil ein Kolben 1 zu entnehmen, der mit einem Nutring 2 bestückt ist. In der Nut 4 befinden sich von radial innen nach außen gesehen zuerst der O-Ring 5 und dann der Gleitring 3.A piston 1 can be seen as an individual part from FIG. 2, which is equipped with a grooved ring 2. In the groove 4 there are first the O-ring 5 and then the slide ring 3 when viewed radially from the inside.

BezugszeichenlisteReference list

  • 1 - Kolben1 - piston
  • 2 - Nutring2 - Nut ring
  • 3 - Gleitring3 - slide ring
  • 4 - Nut4 - groove
  • 5 - O-Ring5 - O-ring
  • 6 - Gehäuse6 - housing
  • 7 - Stirnseite7 - face

Claims (6)

  1. Cylinder for hydraulic and/or pneumatic installations, in particular for motor vehicles, comprising a housing with an axial bore in which a piston is guided to slide axially and is acted on at one end face by a medium under pressure, the cylinder being provided with at least one connection for at one pressure pipe and that the piston being sealed with respect to the cylinder by at least one piston ring and being guided on its external surface between the piston ring and the end of it which is exposed to pressure through a sliding ring,
    characterised in that
    the sliding ring (3) is supported radially on the inside on an O-ring (5).
  2. Cylinder according to claim 1,
    characterised in that
    the sliding ring (3) is arranged in a separate groove (4).
  3. Cylinder according to claim 1,
    characterised in that
    the sliding ring (3) is made of a sliding bearing material.
  4. Cylinder according to claim 1,
    characterised in that
    the sliding ring (3) abuts directly against a shoulder on the piston ring (2).
  5. Cylinder according to claim 1,
    characterised in that
    the sliding ring (3) and the piston ring (2) are arranged on a stepped cylindrical shoulder having different diameters.
  6. Cylinder according to claim 1,
    characterised in that
    the sliding ring (3) and the piston ring (2) are separated from one another by a disc arranged in a groove.
EP93113797A 1992-09-09 1993-08-28 Cylinder for hydraulic and/or pneumatic installations Revoked EP0586995B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4230123 1992-09-09
DE4230123A DE4230123A1 (en) 1992-09-09 1992-09-09 Cylinders for hydraulic and / or pneumatic systems

Publications (2)

Publication Number Publication Date
EP0586995A1 EP0586995A1 (en) 1994-03-16
EP0586995B1 true EP0586995B1 (en) 1997-02-19

Family

ID=6467582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93113797A Revoked EP0586995B1 (en) 1992-09-09 1993-08-28 Cylinder for hydraulic and/or pneumatic installations

Country Status (3)

Country Link
EP (1) EP0586995B1 (en)
JP (1) JP2660652B2 (en)
DE (2) DE4230123A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000009916A1 (en) * 1998-08-15 2000-02-24 Federal-Mogul Technology Limited Seal assembly for a disc brake
EP1219851A1 (en) 2001-01-02 2002-07-03 Ford Global Technologies, Inc. Hydraulic brake system for vehicles

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19516392C5 (en) * 1995-05-04 2004-04-29 Zf Sachs Ag Pressure fluid drive
EP1164316B1 (en) 2000-06-09 2009-11-25 FTE automotive GmbH Hydraulic actuator for a shifting rod
DE102014009360A1 (en) 2014-06-20 2014-12-04 Daimler Ag Closure element for closing an opening of a component
US20160017997A1 (en) 2014-07-17 2016-01-21 Danfoss Power Solutions Inc. Self-centering servo piston
DE102021205371A1 (en) * 2021-05-27 2022-12-01 Robert Bosch Gesellschaft mit beschränkter Haftung accumulator piston device

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708456B2 (en) * 1977-02-26 1980-10-02 Herbert 6395 Weilrod Urbaschek Sliding seal for pistons and piston rods
DE3406644A1 (en) * 1984-02-24 1985-08-29 Festo KG, 7300 Esslingen PISTON CYLINDER AGGREGATE
DE3436312A1 (en) * 1984-10-04 1986-04-10 Volkswagen AG, 3180 Wolfsburg Pressure transducer for a hydraulic system
JPS6170652U (en) * 1984-10-16 1986-05-14
DE3524774A1 (en) * 1985-07-11 1987-01-22 Daimler Benz Ag Pressure-medium working cylinder, in particular filling cylinder for hydrodynamic brakes
DE3545882A1 (en) * 1985-12-23 1987-06-25 Bbc Brown Boveri & Cie Piston/cylinder arrangement, in particular for a high-voltage circuit breaker
JPS6350590A (en) * 1986-08-13 1988-03-03 日本油脂株式会社 Deinking agent for regenerating old paper
JPS6439967U (en) * 1987-09-03 1989-03-09
DE3738741A1 (en) * 1987-11-14 1989-05-24 Teves Gmbh Alfred MASTER CYLINDER
DE3816608A1 (en) * 1988-05-16 1989-11-30 Teves Gmbh Alfred HYDRAULIC CYLINDER
JPH0444565U (en) * 1990-08-20 1992-04-15

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000009916A1 (en) * 1998-08-15 2000-02-24 Federal-Mogul Technology Limited Seal assembly for a disc brake
EP1219851A1 (en) 2001-01-02 2002-07-03 Ford Global Technologies, Inc. Hydraulic brake system for vehicles

Also Published As

Publication number Publication date
JP2660652B2 (en) 1997-10-08
DE59305481D1 (en) 1997-03-27
DE4230123A1 (en) 1994-03-17
EP0586995A1 (en) 1994-03-16
JPH0755013A (en) 1995-03-03

Similar Documents

Publication Publication Date Title
DE4329211B4 (en) Reciprocating pump with a housing block and at least one Hubkolbenpumpenelement
DE4407978C2 (en) piston pump
EP2880329B1 (en) Slave cylinder for a hydraulic disengagement arrangement for operating a clutch
EP2205865B1 (en) Piston pump for conveying a fluid and associated braking system
WO1999006702A1 (en) Piston pump
EP0914561B1 (en) Piston pump with a pipe segment as a bushing
EP0586995B1 (en) Cylinder for hydraulic and/or pneumatic installations
EP0334924A1 (en) Lockable hydraulic cylinder
EP1110017B1 (en) LOW-FRICTION SEAL and hydraulic cylinder
DE3831459A1 (en) Locking device for double-acting fluid cylinders, in particular hydraulic cylinders
DE4224328A1 (en) Master brake cylinder with central valve and additional device controlling the pressure medium quantity
EP0804686A1 (en) Piston pump
EP0164334B1 (en) Hydraulic cylinder with force multiplication
DE2706785C2 (en) Hydraulic correction device for a brake
DE4234626C2 (en) Pressure controlled valve
DE19854719B4 (en) piston pump
EP0931964B1 (en) Directional valve
DE19653270B4 (en) Master cylinder for hydraulic actuation systems
DE102005030732A1 (en) Piston and cylinder unit for especially clutch operation in motor vehicle has effective pressure area of piston made variable through piston's axial travel
DE10205814A1 (en) Pressure media storage unit for electrohydraulic brake comprises a gas and fluid separation element provided with a guide which is constituted as a valve blocking two fluid spaces from one another
EP0836006A2 (en) Piston pump
DE3625805A1 (en) HYDRAULIC PRESSURE TRANSLATOR
DE19813981C2 (en) Spool-controlled directional valve
DE3636443A1 (en) Pressure control unit, especially for pressure medium-operated motor vehicle brake systems
DE3443278A1 (en) Sealing arrangement subjected to pressure

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19940511

17Q First examination report despatched

Effective date: 19951208

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19970219

REF Corresponds to:

Ref document number: 59305481

Country of ref document: DE

Date of ref document: 19970327

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: FRIED. KRUPP AG HOESCH-KRUPP

Effective date: 19971016

26 Opposition filed

Opponent name: FTE AUTOMOTIVE GMBH

Effective date: 19971119

Opponent name: FRIED. KRUPP AG HOESCH-KRUPP

Effective date: 19971016

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: MANNESMANN SACHS AKTIENGESELLSCHAFT

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

R26 Opposition filed (corrected)

Opponent name: THYSSEN KRUPP AG * 19971119 FTE AUTOMOTIVE GMBH

Effective date: 19971016

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19990810

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19990825

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990918

Year of fee payment: 7

RDAH Patent revoked

Free format text: ORIGINAL CODE: EPIDOS REVO

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 20000306

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state

Free format text: 20000306