EP2187064A1 - Cylindre de pression doté d'une douille de guidage à fonctionnement optimisé - Google Patents

Cylindre de pression doté d'une douille de guidage à fonctionnement optimisé Download PDF

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Publication number
EP2187064A1
EP2187064A1 EP08169244A EP08169244A EP2187064A1 EP 2187064 A1 EP2187064 A1 EP 2187064A1 EP 08169244 A EP08169244 A EP 08169244A EP 08169244 A EP08169244 A EP 08169244A EP 2187064 A1 EP2187064 A1 EP 2187064A1
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.)
Granted
Application number
EP08169244A
Other languages
German (de)
English (en)
Other versions
EP2187064B1 (fr
Inventor
Ralf Koberstein
Jörg Buhl
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 AT08169244T priority Critical patent/ATE500427T1/de
Priority to DE502008002756T priority patent/DE502008002756D1/de
Priority to EP08169244A priority patent/EP2187064B1/fr
Publication of EP2187064A1 publication Critical patent/EP2187064A1/fr
Application granted granted Critical
Publication of EP2187064B1 publication Critical patent/EP2187064B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 bear 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Systems And Boosters (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Braking Arrangements (AREA)
  • Pens And Brushes (AREA)
  • Actuator (AREA)
EP08169244A 2008-11-17 2008-11-17 Cylindre de pression doté d'une douille de guidage à fonctionnement optimisé Not-in-force EP2187064B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT08169244T ATE500427T1 (de) 2008-11-17 2008-11-17 Druckmittelzylinder mit einer funktionsoptimierten führungshülse
DE502008002756T DE502008002756D1 (de) 2008-11-17 2008-11-17 Druckmittelzylinder mit einer funktionsoptimierten Führungshülse
EP08169244A EP2187064B1 (fr) 2008-11-17 2008-11-17 Cylindre de pression doté d'une douille de guidage à fonctionnement optimisé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08169244A EP2187064B1 (fr) 2008-11-17 2008-11-17 Cylindre de pression doté d'une douille de guidage à fonctionnement optimisé

Publications (2)

Publication Number Publication Date
EP2187064A1 true EP2187064A1 (fr) 2010-05-19
EP2187064B1 EP2187064B1 (fr) 2011-03-02

Family

ID=40547419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08169244A Not-in-force EP2187064B1 (fr) 2008-11-17 2008-11-17 Cylindre de pression doté d'une douille de guidage à fonctionnement optimisé

Country Status (3)

Country Link
EP (1) EP2187064B1 (fr)
AT (1) ATE500427T1 (fr)
DE (1) DE502008002756D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2969086A1 (fr) * 2010-12-21 2012-06-22 Bosch Gmbh Robert Piston primaire de maitre-cylindre tandem et maitre-cylindre tandem equipe d'un tel piston primaire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794508A1 (fr) * 1999-06-04 2000-12-08 Valeo Dispositif simplifie de commande hydraulique d'un embrayage, notamment pour vehicule automobile
US20030010027A1 (en) * 2001-07-16 2003-01-16 Dangel Tim M. Master cylinder with improved piston guidance
DE10352941A1 (de) 2003-11-11 2005-06-09 Zf Friedrichshafen Ag Druckmittelzylinder für eine hydraulische Betätigunseinrichtung
EP1602544A1 (fr) 2004-06-04 2005-12-07 Zf Friedrichshafen Ag Maítre-cylindre hydraulique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794508A1 (fr) * 1999-06-04 2000-12-08 Valeo Dispositif simplifie de commande hydraulique d'un embrayage, notamment pour vehicule automobile
US20030010027A1 (en) * 2001-07-16 2003-01-16 Dangel Tim M. Master cylinder with improved piston guidance
DE10352941A1 (de) 2003-11-11 2005-06-09 Zf Friedrichshafen Ag Druckmittelzylinder für eine hydraulische Betätigunseinrichtung
EP1602544A1 (fr) 2004-06-04 2005-12-07 Zf Friedrichshafen Ag Maítre-cylindre hydraulique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2969086A1 (fr) * 2010-12-21 2012-06-22 Bosch Gmbh Robert Piston primaire de maitre-cylindre tandem et maitre-cylindre tandem equipe d'un tel piston primaire
WO2012084450A1 (fr) * 2010-12-21 2012-06-28 Robert Bosch Gmbh Piston primaire de maître-cylindre tandem et maître-cylindre tandem equipe d'un tel piston primaire.
US9643579B2 (en) 2010-12-21 2017-05-09 Robert Bosch Gmbh Primary piston for a tandem master cylinder and tandem master cylinder equipped with such a primary piston

Also Published As

Publication number Publication date
DE502008002756D1 (de) 2011-04-14
ATE500427T1 (de) 2011-03-15
EP2187064B1 (fr) 2011-03-02

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