EP2556252A1 - Element d'etancheite annulaire - Google Patents

Element d'etancheite annulaire

Info

Publication number
EP2556252A1
EP2556252A1 EP11705181A EP11705181A EP2556252A1 EP 2556252 A1 EP2556252 A1 EP 2556252A1 EP 11705181 A EP11705181 A EP 11705181A EP 11705181 A EP11705181 A EP 11705181A EP 2556252 A1 EP2556252 A1 EP 2556252A1
Authority
EP
European Patent Office
Prior art keywords
sealing
sealing element
piston
contour
contact surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11705181A
Other languages
German (de)
English (en)
Inventor
Oliver Gaertner
Wolfgang Schuller
Michael Schuessler
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2556252A1 publication Critical patent/EP2556252A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F04B39/0016—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons with valve arranged in the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston

Definitions

  • the invention relates to an annular sealing element, in particular for a hydraulic piston pump, for sealing a pressure area filled with a fluid, in which an end face is pressed against a contact surface of a piston. Furthermore, the invention relates to a hydraulic piston pump with an annular sealing element and a vehicle brake system with a hydraulic piston pump.
  • hydraulic piston pumps are usually axially on a piston and slide when retracting and extending the piston in a cylinder on an inner circumferential surface of the cylinder, on a so-called sealing surface over.
  • the sealing element is usually positioned between the cylinder and the piston so that it is pressed with one end face on a contact surface of the piston. This end face of the sealing element is a substantially flat surface.
  • DE 102 40 052 A1 discloses a sealing and guiding device, in particular for a cylindrical pumping element.
  • This device includes a
  • Sealing element made of an elastic material and a guide element made of a substantially inelastic material, wherein the sealing element is non-positively and / or positively connected fixedly connected to the guide element, so that the sealing element and the guide element are formed as a common assembly.
  • the sealing element comprises a lip arrangement which is arranged at a predetermined angle to the circumference of a surface to be sealed of a moving piston element. This allows the sealing element, the piston element in the pressureless and pressurized state seal, since it always provides forces in the direction perpendicular to the outer circumference of the piston member due to its elasticity.
  • the sealing element preferably has a region which, in the pressurized state of the sealing element, provides additional force to the lip arrangement for pressing the sealing element against the piston element. This is intended to further improve the safety of the seal.
  • the object of the invention is to provide a sealing element which allows a good seal, in particular between the end face of the sealing element and the corresponding contact surface of the piston.
  • the sealing element should also compensate for form inaccuracies of the contact surface of the piston and thus create a good fit.
  • annular sealing element in particular for a hydraulic piston pump, for sealing a pressure area filled with a fluid, in which an end face is pressed against a contact surface of a piston, and in which the end face is formed with a sealing contour such that the sealing contour passes through the applied pressure is elastically deformable on the contact surface.
  • the hydraulic piston pump comprises a cylindrical piston, which is mounted in and retracted in an inner space of a cylinder.
  • the interior of the cylinder is bounded by a cylindrical wall.
  • an inventive annular sealing element is arranged, which seals a filled with a fluid pressure area in the interior of the cylinder.
  • a negative pressure is built up in the pressure region and the piston sucks fluid into the pressure region via an inlet valve.
  • the piston forces the fluid through an outlet valve from the pressure area into a hydraulic system to do work.
  • a fluid is to be understood as meaning a gas or also a hydraulic fluid, such as a hydraulic oil based on mineral oil or glycol.
  • the annular sealing element according to the invention comprises an inner and outer lateral surface and an end face.
  • Sealing element abuts against an outer circumferential surface of the piston and the outer circumferential surface of the sealing element on the inner circumferential surface of the
  • the end face of the sealing element is pressed, for example by means of a return spring, which is mounted within the pressure range, against a contact surface - a shoulder of the piston - and thus held in position.
  • the end face is provided with a specific sealing contour, which has elastic properties.
  • This sealing contour is elastically deformed due to the applied pressure on the contact surface of the piston.
  • the sealing contour conforms precisely to a specific surface structure of the contact surface and seals it substantially fluid-tight. Due to the
  • Deformation of the sealing contour adapts the end face to the contact surface better than an end face with a substantially flat surface.
  • Tightness of the sealing element is advantageously increased.
  • manufacturing-related unevenness of the contact surface of the piston can be compensated in this way. Leakages of the hydraulic piston pump are reduced especially at low back pressures and thus increases the efficiency of the pump.
  • the sealing contour has at least one sealing lip.
  • the sealing lip can taper in cross section or have a dome-like shape.
  • the sealing lip is elastically deformable and abuts against the contact surface when pressure is applied.
  • a relatively narrow sealing lip fits due to their high Flexibility on bumps in the contact surface, such as dents or surveys, very good.
  • the sealing contour has a plurality of sealing lips, which are designed to be corrugated in cross section.
  • the sealing contour can, for example, as a so-called corrugated plate with preferably 10 to 15 individual
  • the individual sealing lips deform elastically when pressure is built up on the end face of the sealing element, so that the individual sealing lips optimally adapt to the surface structure of the contact surface.
  • the sealing lips can also - viewed in cross section - elastically deform by laterally applied pressure. This lateral pressure is present when high pressures prevail in the pressure area and fluid is forced into a region between the end face of the sealing element and the contact surface of the piston. In such a case, the fluid presses the sealing lips in the direction of the outer jacket surface of the sealing element and the sealing lips fit tightly against the contact surface and prevent leakage of the fluid in the direction of the wall of the cylinder.
  • Sealing lips with a wave shape in cross section adapt particularly well to a contact surface with little unevenness.
  • the sealing contour has a plurality of sealing lips which taper in cross section.
  • the sealing contour with multiple sealing lips also provides a particularly effective seal.
  • the sealing contour may also be formed as a so-called corrugated plate with preferably 10 to 15 individual sealing lips.
  • the individual sealing lips deform elastically when pressure is built up on the end face of the sealing element, so that the individual sealing lips of the Optimally adapt the surface structure of the contact surface.
  • Sealing lips which taper in cross section, are particularly suitable for contact surfaces, which have greater unevenness in the surface structure.
  • the sealing lips can adapt well with their tips, for example, to depressions or grooves and effectively seal them.
  • the sealing contour is formed spirally in plan view.
  • Such a spiral sealing contour is arranged in a spiral
  • Sealing lip formed, which may be designed, for example, dome-like or tapered in cross section.
  • the sealing contour preferably has 8 to 15 turns. The spiral shape allows a good seal over a large area.
  • the tips or crests of the sealing contour are slightly elastically deformed under pressure and fit well on the contact surface of the piston.
  • At least one, in particular two, high-pressure-side sealing lips are integrally formed on the side facing away from the end face of the sealing element.
  • the high-pressure side sealing lip is arranged on the opposite side of the front side.
  • the sealing lip has two legs, which on the one hand with the
  • the high pressure side sealing lip closes closely against the sealing surface of the cylinder and the outer surface of the piston.
  • the high-pressure side sealing lip may be formed in its contour such that a part of a
  • Valve housing is received, so that the valve housing on the outer circumferential surface of the piston supports the sealing element.
  • Sealing element is the Dichtlement a molded plastic injection molded part.
  • a sealing element is in one piece, preferably formed from an elastomer or elastomeric material. It is inexpensive to manufacture and easy to assemble in the manufacturing process with other components.
  • the sealing element is integrally formed on a valve housing.
  • the sealing element with the valve housing forms a single component.
  • This element is preferably in one
  • a hydraulic piston pump is provided with an annular sealing element.
  • the piston pump according to the invention comprises a cylinder and a piston which can be retracted and extended in the cylinder.
  • An annular sealing element according to the invention is arranged between the piston and an inner circumferential surface, the so-called sealing surface, and seals a fluid-filled one
  • a vehicle brake system is provided with a hydraulic piston pump.
  • Such a vehicle brake system for example, an anti-lock braking system (ABS), a traction control system (TCS - traction control system), an electronic stabilization program (ESP) or a
  • EHB electrohydraulic braking system
  • FIG. 1 shows a longitudinal section of a hydraulic piston pump with a first embodiment of a sealing element according to the invention
  • FIG. 2 is a perspective view of the detail II in Fig. 1 on an enlarged scale
  • FIG. 3 is a perspective view of a second embodiment of a sealing element according to the invention that is integrally formed on a valve cage,
  • Fig. 5 shows a cross section of a third embodiment of a
  • Fig. 1 illustrates a section of a hydraulic piston pump a cylinder 12 and a retractable in the cylinder 12 and extendable
  • the piston 14 comprises an inlet valve 16.
  • the inlet valve 16 is arranged in a valve housing 18, which is clamped on a holder 20.
  • the valve 16 is intended to suck fluid by means of a lifting movement of the piston 14 through an inlet device 22 in a pressure region 24 in the interior of the cylinder 12 and through an outlet, not shown with an outlet valve under pressure from the pressure region 24 in a hydraulic system for the performance of To promote work.
  • the fluid is present a brake fluid.
  • the valve housing 18 is cup-shaped designed as a cage in the interior of which a helical return spring 26 is located, which urges against a spherical closing body 28.
  • the closing body 28 thereby abuts against a valve seat 30, which is formed on the end face of the piston 14.
  • the piston 14 is resiliently biased in the axial direction by means of a return spring 32 arranged in the pressure region 24.
  • the return spring 32 is based on Fig. 1 at its left end supported on an end face of the cylinder 12 and urges at its right end against a spring support 34 which is formed as a part of the valve housing 18.
  • the spring support 34 is thus fixedly coupled to the piston 14, so that the return spring 32nd
  • Inlet valve 16 lifted from the valve seat 30 against the force of the helical return spring 26, since a negative pressure in the cylinder 12 is established. During this movement of the piston 14, the inlet valve 16 is opened and fluid is sucked into the pressure region 24 via the inlet device 22.
  • annular sealing element 36 is disposed of an elastic material, with which the pressure region 24 is sealed in the cylinder 12.
  • the sealing element 36 is pressed onto the piston 14 and is located axially on the outer surface of the
  • the sealing element 36 (see also Fig. 2) has on the side of the
  • Pressure region 24 faces, a high pressure side sealing lip 38 with two legs 40, 42, which on the one hand with the inner circumferential surface of the
  • Cylinder 12 and on the other with the outer circumferential surface of the piston 14 each include a certain angle ⁇ , ß.
  • ⁇ , ß In this high-pressure side
  • Sealing lip 38 engages a part of the valve housing 18 and holds this.
  • the sealing element 36 is thus radially inward against the inner circumferential surface of the cylinder 12 to slide there during the strokes of the piston 14 along and seal it.
  • Fig. 2 shows the annular sealing element 36 of FIG. 1 in an enlarged view.
  • an end face 44 with a low-pressure-side sealing contour 46 is arranged on the side opposite the high-pressure-side sealing lip 38.
  • This sealing contour 46 has an arrangement of some,
  • sealing lips 48 which taper in cross section.
  • the sealing lips 48 rest with their tips on a contact surface 50 of the piston 14 (see Fig. 1). If pressure is exerted on the end face 44 of the sealing element 36 - during retraction of the piston 14 via the return spring or at
  • Piston 14 The tapered sealing lips 48 tilt to the side, make contact with the contact surface 50 and seal in this way a range between the outer surface of the piston 15 and the inner circumferential surface of the cylinder 12 substantially fluid-tight.
  • Fig. 3, 4 and 5 show an annular sealing element 36 which with a
  • Valve housing 18 is formed as a one-piece component 52.
  • This one-piece component 52 is present as a molded plastic injection molded part, which is particularly inexpensive to manufacture.
  • the valve housing 18 of the component 52 has four webs 54 which receive and guide the closing body 28 of the inlet valve 16 inside. Further, the webs 54 with the holder 20 of the piston 14 are frictionally clamped (see Fig. 1).
  • the sealing element 36 of the component 52 has a sealing contour 46 with several, in particular 1 1, arranged in an annular, elastically deformable
  • Sealing lips 48 on. 3 and 4 the sealing lips 48, when viewed in cross section, taper to a point, whereas the sealing lips 48 in FIG. 5 have a wave-shaped cross-section. Under the influence of pressure p, the tapered or wave-shaped sealing lips 48 are pressed against the contact surface 50 of the piston 14 and deform elastically.
  • the fluid in the pressure region 24 also exerts a pressure parallel to the end face 44, d. H. perpendicular to the protruding sealing lips 48. These lie thereby according to this pressure direction of the fluid to the

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Sealing Devices (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

L'invention concerne un élément d'étanchéité annulaire (36), en particulier pour une pompe à piston hydraulique (10), pour l'étanchéité d'une zone de pression (24) remplie de fluide. Un côté frontal (44) de l'élément d'étanchéité annulaire (36) est pressé contre une surface d'appui (50) d'un piston (14), et le côté frontal (44) est réalisé avec un contour d'étanchéité (46) de telle sorte que le contour d'étanchéité (46) puisse être déformé élastiquement par la pression exercée sur la surface d'appui (50).
EP11705181A 2010-04-07 2011-02-09 Element d'etancheite annulaire Withdrawn EP2556252A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010003674A DE102010003674A1 (de) 2010-04-07 2010-04-07 Ringförmiges Dichtelement
PCT/EP2011/051847 WO2011124405A1 (fr) 2010-04-07 2011-02-09 Élément d'étanchéité annulaire

Publications (1)

Publication Number Publication Date
EP2556252A1 true EP2556252A1 (fr) 2013-02-13

Family

ID=43828065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11705181A Withdrawn EP2556252A1 (fr) 2010-04-07 2011-02-09 Element d'etancheite annulaire

Country Status (6)

Country Link
US (1) US20130199365A1 (fr)
EP (1) EP2556252A1 (fr)
JP (1) JP2013527899A (fr)
CN (1) CN102834613B (fr)
DE (1) DE102010003674A1 (fr)
WO (1) WO2011124405A1 (fr)

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Also Published As

Publication number Publication date
DE102010003674A1 (de) 2011-10-13
JP2013527899A (ja) 2013-07-04
CN102834613B (zh) 2016-08-03
WO2011124405A1 (fr) 2011-10-13
US20130199365A1 (en) 2013-08-08
CN102834613A (zh) 2012-12-19

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