WO2012146337A1 - Maître-cylindre de frein pour une installation de frein de véhicule - Google Patents

Maître-cylindre de frein pour une installation de frein de véhicule Download PDF

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Publication number
WO2012146337A1
WO2012146337A1 PCT/EP2012/001332 EP2012001332W WO2012146337A1 WO 2012146337 A1 WO2012146337 A1 WO 2012146337A1 EP 2012001332 W EP2012001332 W EP 2012001332W WO 2012146337 A1 WO2012146337 A1 WO 2012146337A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing element
annular groove
master cylinder
side wall
annular
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.)
Ceased
Application number
PCT/EP2012/001332
Other languages
German (de)
English (en)
Inventor
Martin Struschka
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 Active Safety GmbH
Original Assignee
Lucas Automotive GmbH
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 Lucas Automotive GmbH filed Critical Lucas Automotive GmbH
Publication of WO2012146337A1 publication Critical patent/WO2012146337A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/236—Piston sealing arrangements
    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/06—Details
    • F15B7/08—Input units; Master units
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/008—Reduction of noise or vibration

Definitions

  • the invention relates to a master cylinder for a vehicle brake system, comprising a housing, a bore formed in the housing with a longitudinal axis in which at least one pressure piston for limiting a pressure chamber for hydraulic fluid along the axis is slidably guided, an annular groove in the housing and a arranged in the annular groove annular sealing element having a substantially axially extending first, radially inner annular sealing element legs for sealing engagement with the pressure piston, a substantially axially extending second, radially outer annular sealing element legs for sealing engagement with a bottom of the annular groove and a first and the second sealing element legs in the radial direction interconnecting, annular sealing element back having a flat outer back surface having a radially outer peripheral edge and a radially inner peripheral edge and a side wall of the R. ingrut facing.
  • a master cylinder is known for example from US 2004/0144248 AI.
  • an unactuated initial state of the master cylinder is usually the pressure chamber hollow toward the pressure piston in a position in which the pressure chamber is formed by a trained in the piston wall, so-called overrun in liquid-conducting connection with a reservoir for hydraulic fluid.
  • this initial state can thus take place pressure equalization between the usually under atmospheric pressure reservoir and the pressure chamber and it can, if necessary, trailing hydraulic fluid from the reservoir into the pressure chamber.
  • the master brake cylinder is actuated to build up the brake pressure, the pressure piston moves into the bore, whereby at the same time the overflow opening formed in the piston wall moves under the first, radially inner sealing element leg of the sealing element and thus the liquid-conducting connection between the pressure chamber and the reservoir for hydraulic fluid is interrupted to allow pressure buildup in the pressure chamber.
  • a slip control unit is frequently arranged between the master brake cylinder and the wheel brake or brakes, for example an ABS system, a traction control system and / or a vehicle dynamics control system.
  • whose control valves represent bottlenecks for the hydraulic fluid and thus limit the hydraulic fluid flow rates.
  • the bottlenecks mentioned decisively determine which pressure build-up and pressure reduction rates are possible in the entire brake system.
  • EP 1 658 212 B1 proposes making the sealing element back uneven and provided with at least one peripheral sealing surface.
  • a distance between the outer back surface of the sealing element and the side wall of the annular groove of the radially outer peripheral edge of the back surface to the radially inner peripheral edge thereof increases continuously.
  • the distance between the outer back surface and the side wall of the annular groove at the radially outer peripheral edge is at least approximately equal to zero.
  • the side wall of the annular groove extends perpendicular to the longitudinal axis of the bore in which the pressure piston is guided, and the outer back surface of the sealing element is inclined to this axis so that the radially outer peripheral edge of the back surface of the side wall is closer than the radially inner peripheral edge of the back surface.
  • the outer back surface of the sealing member may extend in the initial state perpendicular to the axis of the bore, in which case the side wall of the annular groove is inclined with respect to this axis so that the radially outer peripheral edge of the back surface of the side wall is closer than the radially inner peripheral edge of the back surface.
  • the back surface of the sealing element during operation of the master cylinder ie at a pressure build-up in the pressure chamber, first at the radially outer peripheral edge of the back surface on the side wall of the sealing element receiving annular groove applies (if this radially outer peripheral edge not already in the starting position on the side wall anlag) and thereby forms an annular seal.
  • a second annular seal is formed by the radially outer sealing element leg, the outer peripheral side of which bears sealingly against the bottom of the annular groove.
  • the entire sealing element consists of elastomer material and is therefore deformable, the plane of the back surface of the pressure chamber settles with increasing pressure Sealing element starting from its radially outer peripheral edge successively more and more to the side wall of the annular groove until at a sufficiently high pressure, the entire flat back surface sealingly abuts the side wall of the annular groove. Decreases the pressure in the pressure chamber of the master cylinder again, the back surface of the sealing element dissolves, starting at its radially inner peripheral edge successively from the side wall of the annular groove.
  • hydraulic fluid from the reservoir can thus flow without hindrance behind the sealing element, the pressure difference is then sufficient to lift the radially outer peripheral edge of the back surface of the side wall of the annular groove and the radially outer sealing element leg from the bottom of the annular groove , so that the hydraulic fluid can flow outside of the sealing element or around the sealing element around into the pressure chamber to effect a pressure equalization.
  • the master cylinder extends between the radially inner sealing element leg and the radially outer sealing element leg of the sealing element back an annular support leg in the axial direction, the free end is formed to rest against the one side wall opposite, the other side wall of the annular groove.
  • this support leg ensures that the entire sealing element is positioned correctly in the annular groove and, for example, the radially outer peripheral edge of the back surface already in the initial position sealingly abuts the associated side wall of the annular groove.
  • the support leg gives the entire sealing element greater stability.
  • the annular support leg is preferably with at least one radial passage opening, but more preferably provided with a plurality of such radial passage openings which are arranged distributed over the circumference of the support leg.
  • at least one radial passage opening is arranged at the free end of the support leg, wherein further radial passage openings can also be arranged at the free end of the support leg or at other axial locations of the support leg.
  • Peripheral surface provided with at least one sealing lip.
  • FIG. 1 shows a longitudinal section through a master cylinder according to the invention
  • FIG. 2 shows an enlarged view of the region of a first pressure piston and a sealing element associated therewith from FIG. 1,
  • FIG. 3 shows the view from FIG. 2 in a state in which the sealing element is overflowed
  • Figure 4 shows a cross section of the sealing element of Figure 3
  • Figure 5 is a spatial, partially sectioned view of the sealing element.
  • Fig. 1 shows in longitudinal section a master cylinder 10 for a hydraulic vehicle brake system, which is often referred to only as a master cylinder.
  • the main- Cylinder 10 has a housing 12 with a bore 14 extending therein along an axis A, which is open at its right in Fig. 1 end.
  • a first pressure chamber 22 is limited in the bore 14, which is in fluid communication with a first brake circuit of the vehicle brake system, not shown here, via an outlet opening 24.
  • Analog is limited between the first pressure piston 16 and the second pressure piston 18 in the bore 14, a second pressure chamber 26 which is in the ready state of the master cylinder 10 via an outlet 28 in fluid communication with a likewise not shown, the second brake circuit of the vehicle brake system.
  • Each brake circuit are associated with certain wheel brakes (not shown) of a vehicle in a conventional manner.
  • a first return spring 30 is disposed between the first pressure piston 16 and the bottom 20 of the bore 14 and biases the first pressure piston 16 in the in the Figs. 1 and 2 reproduced rest position or initial position.
  • a second return spring 32 which is supported on the first pressure piston 16, biases the second pressure piston 18 into the starting position shown in FIG.
  • the master cylinder 10 shown here is in the operating state, that is, in a state installed in a vehicle, usually connected to a brake booster not shown here to form a structural unit.
  • a force output member (not shown) of the brake booster engages in a recess 34 of the second pressure piston 18 to initiate the boost force generated by the brake booster in the master cylinder 10.
  • An applied by a vehicle user via an unillustrated brake pedal actuating force is transmitted to the power output member of the brake booster and thus also acts on the second pressure piston 18.
  • the master cylinder 10 is in the operating state in fluid communication with a reservoir, not shown, for hydraulic fluid, with two connecting pieces in 12 existing terminals 36 and 38 is inserted on top of the housing.
  • hydraulic fluid located in the hydraulic fluid reservoir can flow through bores 40, 42 in the housing 12 into two annular follow-up chambers 44, 46 and from there through supply openings 48, 50 into the pressure pistons 16, 18 into the first pressure chamber 16 second pressure chamber mer 18 arrive when the pressure piston 16, 18 are in their initial position.
  • the further detailed structure and function of such a master cylinder 10 as well as the components cooperating therewith are well known to those skilled in the art and therefore will be described herein only insofar as is necessary to understand the present invention.
  • annular sealing elements 52, 54 are used for sealing the pressure pistons 16, 18 in the bore 14.
  • FIGS. 2 to 5 the structure and mode of operation of the sealing elements 52 will be described using the sealing element 52 assigned to the first pressure piston 16 as an example and 54 explained in more detail.
  • the sealing element 52 is received in an annular groove 56 which is formed in the housing 12 and a bottom 58 and two side walls 60 and 62 which are opposite and in the embodiment shown both radially and perpendicular to the axis A.
  • the sealing element 52 is an integrally molded component of an elastomer material customary for such sealing elements. It has a substantially axially extending first, radially inner annular sealing element limb 64, a substantially radially extending second, radially outer annular sealing element limb 66 and a substantially radially extending sealing element back 68 connecting the two sealing element limbs 64 and 66 with a planar, outer back surface 70. Between the first, inner sealing element leg 64 and the second, outer sealing element leg 66 extends from the sealing element back 68 on the side remote from the back surface 70 side an annular support leg 72 in the axial direction beyond the two sealing element legs 64, 66 addition.
  • the free end of the support leg 72 is formed with an annular contact surface 74 for planar engagement with the side wall 60 of the annular groove 56.
  • the support leg 72 is provided in the region of its free end with a plurality of radial passage openings 76 which are arranged distributed over the circumference (see also Fig. 5).
  • annular, planar back surface 70 of the sealing member 52 is arranged inclined to the axis A, that its radially outer peripheral edge 82 is close to the side wall 62 or in contact therewith, while a radially inner peripheral edge 84 of the back surface 70 of this side wall 62 is further away.
  • the back surface 70 of the sealing member 52 from the outer peripheral edge 82 to the inner peripheral edge 84 continuously away from the side wall 62 of the annular groove 56, ie, a gap s between the back surface 70 and the side wall 62 becomes continuously larger in a direction radially inward.
  • hydraulic fluid can pass from the lag chamber 44 through an annular gap 86 and the lag opening 48 into and out of the first pressure chamber 22.
  • a braking pressure building up in the pressure chamber 22 acts on the sealing element 52 and on the one hand causes the two sealing element legs 64, 66 to be forced apart in the radial direction and thus more firmly against the outer peripheral surface of the first pressure piston 16 or to the bottom 58 create the annular groove 56, and leads to the other to the fact that the flat back surface 70 of the sealing member 52, starting from its radially outer peripheral edge 82 increasingly applied to the side wall 62 of the annular groove 56. If the pressure in the first pressure chamber 22 is sufficiently high, the entire back surface 70 is in abutment with the side wall 62.
  • the outer sealing member leg 66 as long as the mentioned pressure difference, pulled slightly radially inwardly, whereby the sealing lip 80 is lifted from the bottom 58 of the annular groove 56 and clears the way for the pressurized hydraulic fluid under pressure.
  • the latter flows, as symbolized by an arrow F in Fig. 3, then further through the radial passage openings 76 in the support leg 72 as long as in the first pressure chamber 22 until said pressure difference is at least substantially balanced.
  • the danger of a sudden Pressure equalization upon reaching the starting position of the pressure piston 16 is overcome in this way.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

L'invention porte sur un maître-cylindre de frein (10) pour une installation de frein de véhicule, comprenant - un corps (12), - un alésage (14) formé dans le corps (12) et présentant un axe longitudinal (A), alésage dans lequel au moins un piston de pression (16) qui délimite une chambre de pression (22) pour le fluide hydraulique est guidé mobile en translation le long de l'axe (A), - une gorge annulaire (56) formée dans le corps (12), et - un élément d'étanchéité annulaire (52) qui est placé dans la gorge annulaire (56) et qui présente une première branche d'élément d'étanchéité annulaire radialement intérieure (64) s'étendant sensiblement axialement, destinée à s'appuyer à joint étanche contre le piston de pression (16), une deuxième branche d'élément étanchéité annulaire radialement extérieure (66) s'étendant sensiblement axialement, destinée à s'appuyer à joint étanche contre un fond (58) de la gorge annulaire (56), et un dos d'élément d'étanchéité annulaire (68) qui présente une surface extérieure de dos plane (70), qui relie l'une à l'autre les première et deuxième branches d'élément d'étanchéité (64 et 66) dans la direction radiale, surface de dos qui présente un bord circonférentiel radialement extérieur (82) et un bord circonférentiel radialement intérieur (84) et qui est en regard d'une paroi latérale (62) de la gorge annulaire (56). Pour obtenir une étanchéité parfaite et pour éviter un choc d'équilibrage entre la pression atmosphérique et une dépression régnant dans la chambre de pression (22), une distance (s) établie entre la surface extérieure de dos (70) et la surface latérale (62) de la gorge annulaire (56) croît continuellement du bord circonférentiel radialement extérieur (82) au bord circonférentiel radialement intérieur (84).
PCT/EP2012/001332 2011-04-27 2012-03-27 Maître-cylindre de frein pour une installation de frein de véhicule Ceased WO2012146337A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011018782.0 2011-04-27
DE102011018782A DE102011018782A1 (de) 2011-04-27 2011-04-27 Hauptbremszylinder für eine Fahrzeugbremsanlage

Publications (1)

Publication Number Publication Date
WO2012146337A1 true WO2012146337A1 (fr) 2012-11-01

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PCT/EP2012/001332 Ceased WO2012146337A1 (fr) 2011-04-27 2012-03-27 Maître-cylindre de frein pour une installation de frein de véhicule

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WO (1) WO2012146337A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101561956B1 (ko) * 2014-11-28 2015-10-20 한국델파이주식회사 차량용 마스터 실린더

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002149A1 (fr) * 1977-11-15 1979-05-30 Societe Anonyme D.B.A. Joint annulaire d'étanchéité pour générateurs de pression hydraulique
US20040144248A1 (en) 2003-01-29 2004-07-29 Advics Co., Ltd. Master cylinder having a seal retainer
EP1658212B1 (fr) 2003-08-18 2007-03-07 Continental Teves AG & Co. oHG Cylindre, destine notamment a des systemes de freinage hydrauliques de vehicules automobiles
DE102006040487B3 (de) * 2006-08-30 2007-11-08 Lucas Automotive Gmbh Dichtelement für einen Bremszylinder einer Fahrzeugbremsanlage
US20090071325A1 (en) 2007-09-05 2009-03-19 Nissin Kogyo Co., Ltd. Cylinder device
EP2165898A1 (fr) 2008-09-19 2010-03-24 Nissin Kogyo Co., Ltd. Appareil de cylindre
EP2165897A1 (fr) * 2008-09-19 2010-03-24 Nissin Kogyo Co., Ltd. Appareil de cylindre
WO2012080253A1 (fr) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Maitre-cylindre de systeme de freins de vehicules automobiles a joint anti-retournement et joint pour un tel maitre-cylindre.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5854307B2 (ja) * 1977-07-15 1983-12-03 アイシン精機株式会社 ピストンカツプ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002149A1 (fr) * 1977-11-15 1979-05-30 Societe Anonyme D.B.A. Joint annulaire d'étanchéité pour générateurs de pression hydraulique
US20040144248A1 (en) 2003-01-29 2004-07-29 Advics Co., Ltd. Master cylinder having a seal retainer
EP1658212B1 (fr) 2003-08-18 2007-03-07 Continental Teves AG & Co. oHG Cylindre, destine notamment a des systemes de freinage hydrauliques de vehicules automobiles
DE102006040487B3 (de) * 2006-08-30 2007-11-08 Lucas Automotive Gmbh Dichtelement für einen Bremszylinder einer Fahrzeugbremsanlage
US20090071325A1 (en) 2007-09-05 2009-03-19 Nissin Kogyo Co., Ltd. Cylinder device
EP2165898A1 (fr) 2008-09-19 2010-03-24 Nissin Kogyo Co., Ltd. Appareil de cylindre
EP2165897A1 (fr) * 2008-09-19 2010-03-24 Nissin Kogyo Co., Ltd. Appareil de cylindre
WO2012080253A1 (fr) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Maitre-cylindre de systeme de freins de vehicules automobiles a joint anti-retournement et joint pour un tel maitre-cylindre.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101561956B1 (ko) * 2014-11-28 2015-10-20 한국델파이주식회사 차량용 마스터 실린더
WO2016085209A1 (fr) * 2014-11-28 2016-06-02 이래오토모티브시스템 주식회사 Maître-cylindre pour véhicule
US10252706B2 (en) 2014-11-28 2019-04-09 Erae Ams Co., Ltd. Master cylinder for vehicle

Also Published As

Publication number Publication date
DE102011018782A1 (de) 2012-10-31

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