EP2187064B1 - Pressurised medium cylinder with a guide jacket that has an ideal function - Google Patents
Pressurised medium cylinder with a guide jacket that has an ideal function Download PDFInfo
- Publication number
- EP2187064B1 EP2187064B1 EP08169244A EP08169244A EP2187064B1 EP 2187064 B1 EP2187064 B1 EP 2187064B1 EP 08169244 A EP08169244 A EP 08169244A EP 08169244 A EP08169244 A EP 08169244A EP 2187064 B1 EP2187064 B1 EP 2187064B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide sleeve
- cylinder
- piston
- housing
- region
- 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.)
- Not-in-force
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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
- F15B15/1428—Cylinders
-
- 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
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
- F15B2215/305—Constructional details thereof characterised by the use of special materials
Definitions
- the invention relates to a pressure medium cylinder for a hydraulic actuation system of a motor vehicle according to the preamble of patent claim 1.
- Such a pressure cylinder is used for example as a master cylinder or slave cylinder for a hydraulic clutch or brake system of a motor vehicle and is from the DE 103 52 941 A1 or the EP 1 602 544 A1 known. It is customary according to a particular embodiment, the housing and also the guide sleeve made of a polyamide material with a fiber additive, whereby a high stiffness and strength of the pressure cylinder can be achieved.
- the piston or its jacket region cooperating with the seal can also be made of a high-strength, fiber-reinforced plastic or of a metallic material in such a cylinder.
- the invention has the object to provide a pressure cylinder of the type mentioned above, which has a high mechanical strength and is also reliably fluid-tight over its service life.
- a pressure medium cylinder for a hydraulic actuation system of a motor vehicle having a housing with a first inner cylinder and with a pressure port and a guide sleeve made of plastic, which is connected to a fastening area formed thereon fixed to the housing and a second inner cylinder with a Cylinder jacket surface which is arranged axially to the first inner cylinder and forms a common liner with this.
- a piston is guided displaceably, which limits a variable pressure chamber.
- a housing-tight seal is provided, which cooperates with the piston and with the housing and / or with the guide sleeve.
- the pressure cylinder is characterized in that the fastening region of the guide sleeve and at least one section the cooperating with the piston cylinder surface of the guide sleeve made of different plastics are executed.
- the basic idea of the invention is to separate the functions of the guide sleeve.
- the guide sleeve has a supporting function in that it has to be supported against the assembly and operating forces occurring on the housing, on the other hand, favorable sliding properties are required for safe and permanent damage-free guidance of the piston.
- a rigid, high strength plastic in particular a glass fiber reinforced polyamide, e.g. PA 66 GF 35
- a tougher plastic e.g. a thermoplastic without fiber additives, e.g. PA 66 or a slip-modified thermoplastic material, e.g. PA 66 PTFE
- the wear on the piston made of plastic or metal can be significantly reduced, which in turn has a positive effect on the life of the seal and the entire pressure cylinder.
- At least a part of the cylinder jacket surface of the guide sleeve is made of a plastic, which has a reduced Gleitreibungsbeiwert in cooperation with the piston relative to the other guide sleeve.
- the basic idea of the invention can be realized in a simple manner if the cylinder jacket surface cooperating with the piston is provided with a plastic coating which differs from the carrier material, in particular with regard to its sliding properties. Instead, in the guide sleeve and an insert, so a further sleeve are inserted and cooperate with the piston. Following this design principle, it proves to be particularly advantageous in terms of manufacturing technology to design the guide sleeve as a composite component with an inner jacket region cooperating with the piston and with an outer jacket region on which the fastening region is formed.
- the guide sleeve is designed as a composite component with a first axial region facing the pressure chamber with a slid optimized material and with a second, the fastening region having second axial region with respect to a required strength, wherein the seal disposed on the first axial region is.
- the sliding-optimized first axial region may extend, for example, up to approximately one third of the total length of the guide sleeve.
- the pressure medium cylinder according to the invention can be designed both as a slave and as a master cylinder.
- Fig. 1 is designed as a hydraulic slave cylinder 10 pressure medium cylinder for actuating a friction clutch of a motor vehicle.
- the pressure medium cylinder 10 comprises first provided with a pressure port 12 on one side closed plastic housing 14 with a stepped cylindrical diameter recess 16, in the open, extended area a likewise made of plastic guide sleeve 18 is inserted and fixed there.
- a plurality of fastening areas in the form of radially splayed snap hooks 20 are provided on the outer peripheral surface of the guide sleeve 18, which in corresponding thereto Window 22 engage the housing 14, there latch and the guide sleeve 18 can thus be supported against the assembly and operating forces on the housing 14.
- an inner cylinder 17 is also formed with a cylinder jacket surface 19, which is arranged axially to an inner cylinder 15 formed in the front part of the housing 14 and with this a common bushing 15, 17 for a slidably disposed there, fiber reinforced Duroplast plastic piston formed on phenolic resin-based, thus limiting a variable piston pressure chamber 26.
- a lip seal 30 is inserted at a diameter step 28 of the housing, which at the same time rests sealingly on the piston 24, on the housing 14 and on the guide sleeve 18.
- the sealing ring 30 can be arranged according to a further, not shown embodiment, between the piston 24 and the housing 14 or between the piston 24 and the guide sleeve 18, wherein in the latter case, a further seal between the guide sleeve 18 and the housing 14 is required ,
- the piston 24 is the pressure chamber side designed with a central recess 32, between the bottom and the cylinder bottom, a helical compression spring 34 is inserted, which loads the piston 24 in its extended position.
- a spherical cap 37 of a pivotable push rod 38 At the opposite axial side of the piston 24 engages in a recess 36 a spherical cap 37 of a pivotable push rod 38, which serves to transmit an actuating force to a drawing not shown here clutch lever and a release further to a disengaging the friction clutch.
- the bushing 15, 17 from penetrating Impurities is inserted between the open end portion of the housing 14 and a surrounding of a Gleitschutzkappe 40 ball head 42 of the push rod 38, a closed bellows 44.
- Fig. 2 shows a modified according to the invention guide sleeve 181 for installation in the above-described slave cylinder 10.
- the guide sleeve is generally characterized by the fact that their attachment areas on the one hand and at least a portion of cooperating with the piston 24 cylinder jacket surface 19 on the other hand are made of different plastics.
- the guide sleeve 181 is designed as a composite component and comprises an inner jacket region 191 cooperating with the piston 24 and an outer jacket region 192, on which the attachment regions in the form of the snap hooks 201 are formed.
- the outer jacket portion 192 is made of a reinforced with glass fibers polyamide, eg PA 66 GF, ie a material with a high wear resistance and the inner, the guide surface of the piston having jacket portion 191 is in contrast from a thermoplastic without fiber additives, eg PA 66, which by a PTFE additive may be slip modified.
- the outer jacket 192 is first produced with the attachment regions 201 by an injection molding process, and in a further step, the inner jacket region is likewise produced by injection molding 191 generated.
- the process steps as far as this appears technologically advantageous can also be reversed. Due to the smaller volume and thus the lower shrinkage, the inner jacket portion 191 can be made extremely dimensionally stable, thereby improving the guidance of the piston 24 in this raceway section. Due to the illustrated material selection acting between the piston 24 and the guide sleeve 181 sliding friction is lowered and the wear of the parts, in particular also of the sealing ring 30 is significantly reduced.
- a radial staggering of the functional elements of the guide sleeve can alternatively also be achieved by a thin plastic coating in comparison to a composite construction, the extent of which is limited to approximately one millimeter and is preferably approximately 10-300 micrometers.
- the inner cylindrical surface of the guide sleeve can also be formed by a separately manufactured and mountable insert using an aforementioned appropriate plastic.
- Fig. 3 shows a guide sleeve 182, which is also used as a composite component, but here in contrast to that of Fig. 2 is designed with an axial division.
- This guide sleeve 182 has a first axial region 193 facing the pressure chamber 26, at the end face of which the abutment surface 195 for the sealing ring 30 (FIG. Fig. 1 ) is provided and which in turn is made of a gleitoptim investigating in cooperation with the piston 24 plastic.
- a second axial region 194 made of a high-strength Plastic connected to which the snap hooks 202 are formed to fix the guide sleeve 182 on the housing 14 of the pressure cylinder 10.
- a guide sleeve with a both radially and axially staggered component structure.
- the guide sleeves 181, 182 of Fig. 2 . 3 be brought to cover.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pens And Brushes (AREA)
- Braking Arrangements (AREA)
- Braking Systems And Boosters (AREA)
- Actuator (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
Die Erfindung betrifft einen Druckmittelzylinder für ein hydraulisches Betätigungssystem eines Kraftfahrzeuges gemäß dem Oberbegriff von Patentanspruch 1.The invention relates to a pressure medium cylinder for a hydraulic actuation system of a motor vehicle according to the preamble of patent claim 1.
Ein solcher Druckmittelzylinder wird beispielsweise als Geber- oder Nehmerzylinder für ein hydraulisches Kupplungs- oder Bremssystem eines Kraftfahrzeuges eingesetzt und ist aus der
Von dieser Problematik ausgehend, stellt sich die Erfindung die Aufgabe, einen Druckmittelzylinder der eingangs genannten Art bereitzustellen, der eine hohe mechanische Festigkeit aufweist und der ebenso über dessen Einsatzdauer zuverlässig fluiddicht ist.Based on this problem, the invention has the object to provide a pressure cylinder of the type mentioned above, which has a high mechanical strength and is also reliably fluid-tight over its service life.
Die vorgenannte Aufgabe wird mit einem Druckmittelzylinder der eingangs genannten Art gelöst, welcher zusätzlich die im Kennzeichen von Patentanspruch 1 genannten Merkmale umfasst.The above object is achieved with a pressure cylinder of the type mentioned, which additionally comprises the features mentioned in the characterizing part of claim 1.
Es wird demnach ein Druckmittelzylinder für ein hydraulisches Betätigungssystem eines Kraftfahrzeuges vorgeschlagen, der ein Gehäuse mit einem ersten Innenzylinder und mit einem Druckanschluss und eine Führungshülse aus Kunststoff aufweist, die mit einem daran ausgebildeten Befestigungsbereich fest mit dem Gehäuse verbunden ist und die einen zweiten Innenzylinder mit einer Zylindermantelfläche aufweist, welcher axial zu dem ersten Innenzylinder angeordnet ist und mit diesem eine gemeinsame Laufbuchse ausbildet. In der Laufbuchse ist ein Kolben verschiebbar geführt, der dabei einen variablen Druckraum begrenzt. Zur Abdichtung des Druckraumes ist eine gehäusefeste Dichtung vorgesehen, die mit dem Kolben und mit dem Gehäuse und/oder mit der Führungshülse zusammenwirkt. Der Druckmittelzylinder zeichnet sich dadurch aus, dass der Befestigungsbereich der Führungshülse und zumindest ein Abschnitt der mit dem Kolben zusammenwirkenden Zylindermantelfläche der Führungshülse aus unterschiedlichen Kunststoffen ausgeführt sind.It is therefore proposed a pressure medium cylinder for a hydraulic actuation system of a motor vehicle having a housing with a first inner cylinder and with a pressure port and a guide sleeve made of plastic, which is connected to a fastening area formed thereon fixed to the housing and a second inner cylinder with a Cylinder jacket surface which is arranged axially to the first inner cylinder and forms a common liner with this. In the liner, a piston is guided displaceably, which limits a variable pressure chamber. To seal the pressure chamber, a housing-tight seal is provided, which cooperates with the piston and with the housing and / or with the guide sleeve. The pressure cylinder is characterized in that the fastening region of the guide sleeve and at least one section the cooperating with the piston cylinder surface of the guide sleeve made of different plastics are executed.
Der grundlegende Gedanke der Erfindung liegt darin, die Funktionen der Führungshülse zu trennen. Zum einen kommt der Führungshülse eine Stützfunktion zu, indem sich diese gegenüber auftretenden Montage und Betriebskräften am Gehäuse abstützen muss, zum anderen sind zur sicheren und zur dauerhaften beschädigungsfreien Führung des Kolbens günstige Gleiteigenschaften erforderlich.The basic idea of the invention is to separate the functions of the guide sleeve. On the one hand, the guide sleeve has a supporting function in that it has to be supported against the assembly and operating forces occurring on the housing, on the other hand, favorable sliding properties are required for safe and permanent damage-free guidance of the piston.
Von dieser Überlegung ausgehend haben die Erfinder vorgesehen, die beiden Funktionsbereiche auch in konstruktiver Hinsicht zu trennen und diese mit unterschiedlichen, jeweils für den vorgesehenen Zweck optimierten Kunststoffen auszuführen. Somit kann zumindest für den Befestigungsbereich ein steifer, hochfester Kunststoff, insbesondere ein mit Glasfasern verstärktes Polyamid, z.B. PA 66 GF 35, mit einem hohen Verschleißwiderstand und zumindest für eine Teil der die Führungsfläche bildenden Mantelfläche ein demgegenüber zäherer Kunststoff, z.B. ein Thermoplast ohne Faserzusätze, z.B. PA 66 oder ein gleitmodifizierter Thermoplastwerkstoff, z.B. PA 66 PTFE, Verwendung finden. Dadurch kann der Verschleiß an dem aus Kunststoff oder Metall gefertigten Kolben deutlicht reduziert werden, was sich wiederum positiv auf die Lebensdauer der Dichtung und des gesamten Druckmittelzylinders auswirkt.Based on this consideration, the inventors have intended to separate the two functional areas also in terms of design and to carry out this with different, each optimized for the intended purpose plastics. Thus, at least for the attachment area, a rigid, high strength plastic, in particular a glass fiber reinforced polyamide, e.g. PA 66 GF 35, with a high wear resistance and at least for a part of the surface forming the guide surface on the other hand a tougher plastic, e.g. a thermoplastic without fiber additives, e.g. PA 66 or a slip-modified thermoplastic material, e.g. PA 66 PTFE, find use. As a result, the wear on the piston made of plastic or metal can be significantly reduced, which in turn has a positive effect on the life of the seal and the entire pressure cylinder.
Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous developments and refinements of the invention are specified in the subclaims.
Gemäß einer Ausgestaltung eines Druckmittelzylinders ist zumindest ein Teil der Zylindermantelfläche der Führungshülse aus einem Kunststoff gefertigt, der im Zusammenwirken mit dem Kolben gegenüber der übrigen Führungshülse einen verringerten Gleitreibungsbeiwert aufweist.According to one embodiment of a pressure cylinder, at least a part of the cylinder jacket surface of the guide sleeve is made of a plastic, which has a reduced Gleitreibungsbeiwert in cooperation with the piston relative to the other guide sleeve.
Der Grundgedanke der Erfindung ist auf einfache Weise realisierbar, wenn die mit dem Kolben zusammenwirkende Zylindermantelfläche mit einer, sich von dem Trägermaterial insbesondere hinsichtlich deren Gleiteigenschaften unterscheidenden Kunststoff-Beschichtung versehen ist. Anstelle dessen kann in die Führungshülse auch ein Einsatzteil, also eine weitere Hülse eingeführt werden und mit dem Kolben zusammenwirken. Diesem Aufbauprinzip folgend, erweist es sich fertigungstechnisch als besonders zweckmäßig, die Führungshülse als Verbundbauteil mit einem inneren, mit dem Kolben zusammenwirkenden Mantelbereich und mit einem äußeren Mantelbereich auszuführen, an welchem der Befestigungsbereich ausgebildet ist.The basic idea of the invention can be realized in a simple manner if the cylinder jacket surface cooperating with the piston is provided with a plastic coating which differs from the carrier material, in particular with regard to its sliding properties. Instead, in the guide sleeve and an insert, so a further sleeve are inserted and cooperate with the piston. Following this design principle, it proves to be particularly advantageous in terms of manufacturing technology to design the guide sleeve as a composite component with an inner jacket region cooperating with the piston and with an outer jacket region on which the fastening region is formed.
Es ist im Sinne der Erfindung jedoch nicht zwingend, die Mantelfläche der Führungshülse über deren gesamte axiale Länge mit einem anderen Kunststoff auszuführen. Eine Verkippung des Kolbens und damit ein abrasiver Verschleiß mit der Führungshülse treten nahezu nur im eingefahrenen Zustand des Kolbens auf. Damit genügt es auch, wenn die Führungshülse als Verbundbauteil mit einem zum Druckraum weisenden ersten Axialbereich mit einem gleitoptimierten Werkstoff und mit einem zweiten, den Befestigungsbereich aufweisenden zweiten Axialbereich hinsichtlich einer geforderten Festigkeit ausgeführt ist, wobei die Dichtung an dem ersten Axialbereich angeordnet ist. Der gleitoptimierte erste Axialbereich kann sich dabei beispielsweise bis zu etwa einem Drittel der Gesamtlänge der Führungshülse erstrecken.However, it is not mandatory in the context of the invention to design the outer surface of the guide sleeve over its entire axial length with another plastic. A tilting of the piston and thus an abrasive wear with the guide sleeve occur almost only in the retracted state of the piston. Thus, it is also sufficient if the guide sleeve is designed as a composite component with a first axial region facing the pressure chamber with a slid optimized material and with a second, the fastening region having second axial region with respect to a required strength, wherein the seal disposed on the first axial region is. The sliding-optimized first axial region may extend, for example, up to approximately one third of the total length of the guide sleeve.
Der erfindungsgemäße Druckmittelzylinder kann sowohl als Nehmer- als auch als Geberzylinder ausgeführt werden.The pressure medium cylinder according to the invention can be designed both as a slave and as a master cylinder.
Die Erfindung wird nachfolgend anhand der Figuren beispielhaft erläutert.The invention will be explained by way of example with reference to the figures.
Es zeigen:
- Fig. 1
- einen hydraulischen Nehmerzylinder mit einem Gehäuse und einer darin angeordneten Führungshülse gemäß dem Stand der Technik;
- Fig. 2
- eine Führungshülse, deren Mantelfläche und Hauptkörper radial gestaf- felt sind und aus unterschiedlichen Kunststoffen bestehen;
- Fig. 3
- eine axial geteilte Führungshülse, deren Teile aus unterschiedlichen Kunststoffen bestehen.
- Fig. 1
- a hydraulic slave cylinder with a housing and a guide sleeve arranged therein according to the prior art;
- Fig. 2
- a guide sleeve whose lateral surface and main body are radially stiffened and made of different plastics;
- Fig. 3
- an axially split guide sleeve whose parts are made of different plastics.
In
Der Kolben 24 ist druckraumseitig mit einer Zentralausnehmung 32 ausgeführt, zwischen deren Boden und dem Zylinderboden eine Schraubendruckfeder 34 eingesetzt ist, welche den Kolben 24 in dessen ausgefahrene Stellung belastet. An der gegenüberliegenden Axialseite des Kolbens 24 greift in einer Ausnehmung 36 eine Kugelkalotte 37 einer verschwenkbaren Stößelstange 38 an, welche zur Übertragung einer Betätigungskraft auf einen hier zeichnerisch nicht dargestellten Kupplungshebel und über einen Ausrücker weiter zu einem Ausrückorgan der Reibungskupplung dient. Zum Schutz des Zylinderinnenraums, insbesondere der Laufbuchse 15, 17 vor eindringenden Verunreinigungen ist zwischen dem offenen Endbereich des Gehäuses 14 und einem von einer Gleitschutzkappe 40 umgebenden Kugelkopf 42 der Stößelstange 38 ein geschlossener Faltenbalg 44 eingesetzt.The
Soweit beschrieben, entspricht der in
Die Führungshülse 181 ist dazu als Verbundbauteil ausgebildet und umfasst einen inneren, mit dem Kolben 24 zusammenwirkenden Mantelbereich 191 und einen äußeren Mantelbereich 192, an welchem die Befestigungsbereiche in Form der Schnapphaken 201 ausgebildet ist. Der äußere Mantelbereich 192 ist dazu aus einem mit Glasfasern verstärkten Polyamid, z.B. PA 66 GF, also einem Werkstoff mit einem hohen Verschleißwiderstand und der innere, die Führungsfläche des Kolbens aufweisende Mantelbereich 191 ist demgegenüber aus einem Thermoplast ohne Faserzusätze, z.B. PA 66, welches durch einen PTFE Zusatz gleitmodifiziert sein kann, hergestellt. Bei der Herstellung der Führungshülse 181 wird zunächst der Außenmantel 192 mit dem Befestigungsbereichen 201 durch ein Spritzgussverfahren hergestellt und in einem weiteren Schritt wird ebenfalls durch Spritzgießen der innere Mantelbereich 191 erzeugt. Selbstverständlich können die Prozessschritte soweit dieses technologisch vorteilhaft erscheint auch vertauscht werden. Aufgrund des kleineren Volumens und damit dem geringeren Schwund kann der innere Mantelbereich 191 äußerst maßhaltig gefertigt werden, so dass sich dadurch die Führung des Kolbens 24 in diesem Laufbahnabschnitt verbessert. Durch die erläuterte Werkstoffauswahl wird die zwischen dem Kolben 24 und der Führungshülse 181 wirkende Gleitreibung erniedrigt und der Verschleiß der Teile, insbesondere auch des Dichtrings 30 deutlich verringert.To this end, the
Eine radiale Staffelung der Funktionselemente der Führungshülse kann alternativ ebenso durch eine im Vergleich zu einer Verbundbauweise dünne Kunststoff-Beschichtung erzielt werden, wobei deren Erstreckung auf etwa einem Millimeter begrenzt ist und vorzugsweise ca. 10-300 Mikrometer beträgt. Als weitere Alternative kann die innere Zylindermantelfläche der Führungshülse auch durch ein separat gefertigtes und montierbares Einsatzteil unter Verwendung eines vorgenannten zweckmäßigen Kunststoffs gebildet werden.A radial staggering of the functional elements of the guide sleeve can alternatively also be achieved by a thin plastic coating in comparison to a composite construction, the extent of which is limited to approximately one millimeter and is preferably approximately 10-300 micrometers. As a further alternative, the inner cylindrical surface of the guide sleeve can also be formed by a separately manufactured and mountable insert using an aforementioned appropriate plastic.
Möglich ist ebenfalls eine Führungshülse mit einem sowohl radial als axial gestaffelten Komponentenaufbau. Dazu können beispielweise die Führungshülsen 181, 182 der
- 1010
- DruckmittelzylinderPressure cylinder
- 1212
- Druckanschlusspressure connection
- 1414
- Gehäusecasing
- 1515
- Innenzylinder des GehäusesInner cylinder of the housing
- 1616
- Ausnehmungrecess
- 1717
- Innenzylinder der FührungshülseInner cylinder of the guide sleeve
- 18, 181, 18218, 181, 182
- Führungshülseguide sleeve
- 1919
- ZylindermantelflächeCylinder surface
- 191191
- Innenmantelinner sheath
- 192192
- Außenmantelouter sheath
- 193193
- erster Axialbereichfirst axial area
- 194194
- zweiter Axialbereichsecond axial area
- 195195
- Anlageflächecontact surface
- 20, 20120, 201
- Befestigungsbereichfastening area
- 2222
- Fensterwindow
- 2424
- Kolbenpiston
- 2626
- Druckraumpressure chamber
- 2828
- Stufestep
- 3030
- Dichtringseal
- 3232
- Zentralausnehmungcentral opening
- 3434
- SchraubendruckfederHelical compression spring
- 3636
- Ausnehmungrecess
- 3737
- Kugelkalottespherical cap
- 3838
- Stößelstangepushrod
- 4040
- GleitschutzkappeGleitschutzkappe
- 4242
- Kugelkopfball head
- 4444
- Faltenbalgbellow
Claims (5)
- Pressure medium cylinder (10) for a hydraulic actuation system of a motor vehicle, comprising- a housing (14) with a first inner cylinder (15) and with a pressure port (12),- a guide sleeve (18) which is composed of plastic and is fixedly connected by means of a fastening region (20) to the housing (14) and has a second inner cylinder (17) with a cylinder lateral surface (19) which is arranged axially with respect to the inner first cylinder (15) of the housing (14) and forms with the latter a common liner (15, 17),- a piston (24) which is arranged movably in the liner (15, 17) and delimits a variable pressure chamber (26),- a seal (30) which is fixed with respect to the housing and interacts with the piston (24) and with the housing (14) and/or the guide sleeve (18),characterized
in that the fastening region (20) of the guide sleeve (18) and at least one section of the cylinder lateral surface (19), which interacts with the piston (24), of the guide sleeve (18) are formed from different plastics. - Pressure medium cylinder according to Claim 1, characterized
in that at least a part of the cylinder lateral surface (19) is produced from a plastic which, in interaction with the piston (24), has a lower coefficient of sliding friction than the rest of the guide sleeve (18). - Pressure medium cylinder according to Claim 1 or 2,
characterized
in that the cylinder lateral surface (19) has a plastic coating or an insert part. - Pressure medium cylinder according to one of the preceding claims,
characterized
in that the guide sleeve (18) is designed as a composite component having an inner casing region (191) which interacts with the piston (24) and having an outer casing region (192) on which the fastening region (201) is formed. - Pressure medium cylinder according to one of the preceding claims,
characterized
in that the guide sleeve (18) is designed as a composite component having a first axial region (193) pointing towards the pressure chamber (26) and having a second axial region (194) which has the fastening region (202), with the seal (30) being arranged on the first axial region (193).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE502008002756T DE502008002756D1 (en) | 2008-11-17 | 2008-11-17 | Pressure medium cylinder with a functionally optimized guide sleeve |
EP08169244A EP2187064B1 (en) | 2008-11-17 | 2008-11-17 | Pressurised medium cylinder with a guide jacket that has an ideal function |
AT08169244T ATE500427T1 (en) | 2008-11-17 | 2008-11-17 | PRESSURE MEDIA CYLINDER WITH A FUNCTION-OPTIMIZED GUIDE SLEEVE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08169244A EP2187064B1 (en) | 2008-11-17 | 2008-11-17 | Pressurised medium cylinder with a guide jacket that has an ideal function |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2187064A1 EP2187064A1 (en) | 2010-05-19 |
EP2187064B1 true EP2187064B1 (en) | 2011-03-02 |
Family
ID=40547419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08169244A Not-in-force EP2187064B1 (en) | 2008-11-17 | 2008-11-17 | Pressurised medium cylinder with a guide jacket that has an ideal function |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2187064B1 (en) |
AT (1) | ATE500427T1 (en) |
DE (1) | DE502008002756D1 (en) |
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FR2969086B1 (en) | 2010-12-21 | 2016-04-29 | Bosch Gmbh Robert | TANDEM MASTER CYLINDER PRIMER PISTON AND MASTER TANDEM MASTER CYLINDER EQUIPPED WITH SUCH A PRIMARY PISTON |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2794508B1 (en) * | 1999-06-04 | 2001-08-24 | Valeo | SIMPLIFIED DEVICE FOR HYDRAULICALLY CONTROLLING A CLUTCH, PARTICULARLY FOR A MOTOR VEHICLE |
US6581380B2 (en) * | 2001-07-16 | 2003-06-24 | Automotive Products (Usa), Inc. | Master cylinder with improved piston guidance |
DE10352941A1 (en) | 2003-11-11 | 2005-06-09 | Zf Friedrichshafen Ag | Pressure cylinder for hydraulic actuator, has piston sleeve enclosing dampening unit and moving axially against seating part formed against piston rod so that unit absorbs pressure pulsations introduced via pressure chamber |
ATE494194T1 (en) | 2004-06-04 | 2011-01-15 | Zahnradfabrik Friedrichshafen | HYDRAULIC CYLINDER |
-
2008
- 2008-11-17 EP EP08169244A patent/EP2187064B1/en not_active Not-in-force
- 2008-11-17 DE DE502008002756T patent/DE502008002756D1/en active Active
- 2008-11-17 AT AT08169244T patent/ATE500427T1/en active
Also Published As
Publication number | Publication date |
---|---|
ATE500427T1 (en) | 2011-03-15 |
EP2187064A1 (en) | 2010-05-19 |
DE502008002756D1 (en) | 2011-04-14 |
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