EP1030974A1 - Dispositif filtrant place dans la chambre d'admission d'une pompe a piston - Google Patents

Dispositif filtrant place dans la chambre d'admission d'une pompe a piston

Info

Publication number
EP1030974A1
EP1030974A1 EP99924731A EP99924731A EP1030974A1 EP 1030974 A1 EP1030974 A1 EP 1030974A1 EP 99924731 A EP99924731 A EP 99924731A EP 99924731 A EP99924731 A EP 99924731A EP 1030974 A1 EP1030974 A1 EP 1030974A1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
rough
bore
piston pump
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Withdrawn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
EP99924731A
Other languages
German (de)
English (en)
Inventor
Norbert Alaze
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
Priority claimed from DE19847470A external-priority patent/DE19847470A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1030974A1 publication Critical patent/EP1030974A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F04B1/0452—Distribution members, e.g. valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • 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
    • 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
    • F04B1/0421—Cylinders
    • 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
    • F04B53/20—Filtering

Definitions

  • the invention relates to a piston pump for a vehicle brake system according to the preamble of the main claim.
  • Piston pumps of this type are known, for example, as mulchier and / or slip-controlled hydraulic vehicle brake systems.
  • the piston pump known from DE 41 07 979 A1 may be mentioned as an example.
  • the known piston pump has a pump housing with a pump bore in which a piston is axially displaceably received.
  • the piston can be driven by means of an eccentric drive to perform a reciprocating axial movement in the pump bore.
  • the piston can be guided directly in the pump bore of the pump housing or, as in the known piston pump, in a liner inserted into the pump bore. Furthermore, it is known to provide a filter for filtering fluid conveyed by the piston pump.
  • the piston pump according to the invention with the features of the main claim has a filter with a rough counter surface which rests on a surface that is, for example, smooth or also rough. Because of the rough, on the Channels with a small cross-section are formed on the opposite surface, through which the fluid to be conveyed is passed and thereby filtered. The roughness of the surface is chosen so that the channels formed have a cross section which corresponds to the size of through openings of filters for such piston pumps.
  • the invention has the advantage that the filter is simple and inexpensive to manufacture.
  • the rough surface can, for example, have knobs or a corrugation, it can be produced as or in the manner of a rim ice (claim 2), with corrugation or the like. Care must be taken to ensure that the corrugation is not continuous across the flow direction of the fluid to be conveyed is designed to allow the flow of fluid.
  • the filter is arranged in the pump bore and the rough surface is shaped to be complementary to the wall of the pump bore, the wall of the pump bore forming the counter surface against which the rough surface bears (claim 3).
  • Complementary means that the rough surface and the wall of the pump bore have the same curvature.
  • the piston pump has a liner, the outer circumferential surface of which is rough at least over part of the total surface and which bears against the wall of the pump bore which forms the counter surface.
  • the wall of the pump bore adjacent bushing forms the counter surface (claim 7).
  • the outer peripheral surface of the liner can be smooth or also rough.
  • the piston pump according to the invention is provided in particular as a pump in a brake system of a vehicle and is used to control the pressure in wheel brake cylinders.
  • ABS or ASR or FDR or EHB are used for such brake systems.
  • the pump is used, for example, to return brake fluid from a wheel brake cylinder or from several wheel brake cylinders into a master brake cylinder (ABS) and / or to convey brake fluid from a reservoir into a wheel brake cylinder or into several wheel brake cylinders (ASR or FDR or EHB) .
  • the pump is required, for example, in a brake system with wheel slip control (ABS or ASR) and / or in a brake system (FDR) serving as a steering aid and / or in an electrohydraulic brake system (EHB).
  • the wheel slip control (ABS or ASR) can, for example, prevent the vehicle's wheels from locking during braking when the brake pedal (ABS) is pressed hard and / or the vehicle's driven wheels spinning when the accelerator pedal (ASR) is pressed hard .
  • brake pressure is built up in one or more wheel brake cylinders independently of an actuation of the brake pedal or accelerator pedal, for example in order to prevent the vehicle from breaking out of the lane desired by the driver.
  • the pump can also be used in an electro-hydraulic brake system (EMS), in which the pump conveys the brake fluid into the wheel brake cylinder or into the wheel brake cylinder if an electric brake pedal sensor detects an actuation of the brake pedal or the pump for filling a memory serves the braking system.
  • EMS electro-hydraulic brake system
  • FIG. 1 shows an axial section of an inventive piston pump that is angled by 90 ° 2
  • FIG. 2 shows a cross section of the piston pump along line 11-11 in FIG. 1.
  • the piston pump according to the invention shown in the drawing has a pump housing 12 with a continuous, stepped pump bore 14.
  • the pump housing 12 is made of metal, in particular die-cast aluminum.
  • the pump housing 12 is part of a hydraulic block (not shown) of a vehicle brake system controlled by an anti-lock and drive slip system.
  • further hydraulic components such as, for example, solenoid valves, damper chambers and hydraulic accumulators are used in the hydraulic block and are hydraulically connected to one another and to the piston pump 10. For the sake of clarity, only a fragment of the hydraulic block surrounding the piston pump 10 is shown in the drawing.
  • a bushing 16 which is made of plastic as an injection molded part and has a bushing base 18 which is integral with it, is inserted into the pump bore 14.
  • a piston 20 made of plastic is axially displaceably received in the bushing 16.
  • the piston 20 is sealed at one end located on the liner 16 with a sealing ring 22 in the liner 16, which is inserted into a piston groove 24.
  • the piston 20 is guided with a plastic guide ring 26 in the pump bore 14 and sealed with a sealing ring 28 in the pump bore 14.
  • the guide ring 26 and the sealing ring 28 are inserted into one another in a step 30 of the pump bore 14 and are held in the step 30 of the pump bore 14 by an end edge 32 of the sleeve 16 facing them.
  • the piston 20 is designed as a stepped piston, ie it is guided and sealed in the sleeve 16 to a larger diameter than at its end projecting from the sleeve 16.
  • a single piston can also be used, which is guided and sealed to the same diameter at both ends (not shown).
  • the piston pump 10 has an eccentric that can be driven by an electric motor on the side of the piston 20 protruding from the liner 16, against the circumference of which the piston 20 formed by a helical compression spring
  • Piston return spring 36 is pressed, which is inserted between the liner bottom 18 and the piston 20 in the liner 16.
  • the piston pump 10 has a spring-loaded check valve with a valve ball 40 as the valve closing body.
  • the valve ball 40 is pressed by a valve closing spring 42 designed as a helical compression spring against a conical valve seat 44 formed centrally in the liner bottom 18.
  • the valve closing spring 42 is supported against a valve cage 46 which is provided with flow openings 48 for brake fluid to be delivered with the piston pump 10.
  • the valve cage 46 is manufactured as a stamped and deep-drawn part from sheet metal. It has a radially outwardly projecting, annular disk-shaped spring plate 50, on which the piston return spring 36 is seated and with which the piston return spring 36 presses the valve cage 46 against the liner bottom 18.
  • the piston return spring 36 is designed considerably stronger than the valve closing spring 42 of the inlet valve 38, so that it reliably holds the valve cage 46 against the force of the valve closing spring 42 in contact with the liner bottom 18 in all loads occurring during the operation of the piston pump 10.
  • the valve cage 46 in which the valve closing spring 42 and the valve ball 40 of the inlet valve 38 are received, is located on the side of the liner bottom 18 facing the piston 20, that is to say inside the liner 16.
  • a brake fluid inflow takes place through an inlet bore 52 in the pump housing 12, which radially opens into the pump bore 14, and further through an annular space in cross section between the bushing 16 and the pump bore 14 into a transverse channel 54 which runs transversely through the bushing base 18.
  • the transverse channel 54 appears in the middle of the bushing base due to the angled sectional view in FIG 18 to end, the transverse channel 54 actually goes through the Bushing bottom 18 through, as Figure 2 shows.
  • the transverse channel 54 is located on a side of the inlet valve 38 facing away from the piston 20.
  • a short central bore 56 leads from the transverse channel 54 to the inlet valve 38, which merges into its valve seat 44.
  • An outflow takes place through an outlet bore 58 which passes laterally next to the transverse channel 54 (FIG. 2) axially parallel to the bushing 16 through the bushing base 18.
  • the outlet bore 58 opens into a valve seat 60 of an outlet valve 62, which is designed as a spring-loaded check valve.
  • the outlet valve 62 has a valve ball 64 as a valve closing body, which is pressed against the valve seat 60 by a valve closing spring 66 designed as a helical compression spring.
  • valve closing spring 66 is supported against a closure cap 68 which closes the pump bore 14 on a side facing away from the eccentric element 34.
  • the cap 68 is held by a circumferential caulking 70 of the pump housing 12 and sealed pressure-tight.
  • the piston pump 10 has a filter 76 which is arranged in the inlet of the piston pump 10.
  • the filter 76 has a bushing 78 which is arranged at the level of the inlet bore 52 and surrounds the bushing 16.
  • the bushing 78 is integrally connected to the bushing 16 with longitudinal ribs 80, the longitudinal ribs 80 hold the bushing 78 at a radial distance from the bushing 16.
  • the bushing 78 has an outwardly protruding bead 82, the circumference of which abuts a wall of the pump bore 14.
  • the circumference of the beads 82 is rough, so that brake fluid flowing into the piston pump 10 can flow on the circumference of the beads 82 between them and the wall of the pump bore 14. Because the flow cross-sections between the rough Circumference of the beads 82 and the wall of the pump bore 14 are small, the brake fluid flowing into the piston pump 10 is filtered as it flows between the beads 82 and the wall of the pump bore 14.
  • the roughness of the circumference of the beads 82 is formed by grooves 84 (FIG. 2) with a smaller cross section and axially through the bead 82.
  • the grooves 84 produced by injection molding the bushing 16 give the circumference of the beads 82 the appearance of knurling.
  • Brake fluid flowing in through the inlet bore 52 of the piston pump 10 first reaches the outside of the bushing 78 of the filter 76, where the flow is divided and deflected to the beads 82 at both ends of the bushing 78. At the ends of the bushing 78, the brake fluid flows through the grooves 84 on the circumference of the beads 82 and is filtered in the process.

Landscapes

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

Abstract

L'invention concerne une pompe à piston (10) pour un système de freinage de véhicule notamment à régulation antiblocage et antipatinage. Pour produire un filtre (76), il est prévu selon l'invention d'entourer une garniture (16) de la pompe à piston (10) avec une douille (78) qui présente des bourrelets (82) au niveau de ses extrémités. Ces bourrelets (82) sont pourvus de rainures (84) à la manière d'un moletage, à travers lesquelles le liquide de frein arrivant dans la pompe à piston (10) s'écoule entre une paroi d'un alésage de pompe (14) et le bourrelet (82), ledit liquide étant ainsi filtré.
EP99924731A 1998-06-17 1999-03-30 Dispositif filtrant place dans la chambre d'admission d'une pompe a piston Withdrawn EP1030974A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19826913 1998-06-17
DE19826913 1998-06-17
DE19847470 1998-10-15
DE19847470A DE19847470A1 (de) 1998-06-17 1998-10-15 Kolbenpumpe
PCT/DE1999/000969 WO1999066206A1 (fr) 1998-06-17 1999-03-30 Dispositif filtrant place dans la chambre d'admission d'une pompe a piston

Publications (1)

Publication Number Publication Date
EP1030974A1 true EP1030974A1 (fr) 2000-08-30

Family

ID=26046854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99924731A Withdrawn EP1030974A1 (fr) 1998-06-17 1999-03-30 Dispositif filtrant place dans la chambre d'admission d'une pompe a piston

Country Status (4)

Country Link
US (1) US6267569B1 (fr)
EP (1) EP1030974A1 (fr)
JP (1) JP2002518636A (fr)
WO (1) WO1999066206A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6846049B2 (en) * 2000-12-27 2005-01-25 Continental Teves Ag & Co. Ohg Valve mechanism, especially for anti-skid automotive brake systems
US6668702B2 (en) * 2001-10-12 2003-12-30 Visteon Global Technologies, Inc. Method an apparatus for producing high pressure compressor cylinder liners
DE10235140B4 (de) * 2002-08-01 2005-02-17 J. Wagner Gmbh Kolbenpumpe
DE102005042196A1 (de) * 2005-09-06 2007-03-08 Robert Bosch Gmbh Kolbenpumpe mit reduziertem Schadraum
US20090057345A1 (en) * 2007-08-31 2009-03-05 Dukes Stephen A Fluid dispenser
DE102010030329A1 (de) * 2010-06-22 2011-12-22 Robert Bosch Gmbh Kolbenpumpe
DE102016219526B4 (de) * 2016-10-07 2021-04-29 Robert Bosch Gmbh Fluidfilter mit einem Filtersteg mit einem Außenabschnitt, einem Mittelabschnitt und einem Innenabschnitt, sowie Verfahren zur Erstellung eines Fluidflilters, sowie Magnetventil und Pumpenelement mit einem entsprechenden Fluidfilter

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773441A (en) * 1971-05-19 1973-11-20 A Schertz Combination sand bailer and fluid pump with automatic grit separator and lubricator
US4312479A (en) * 1980-02-19 1982-01-26 Stanadyne, Inc. Fuel injection nozzle with edge filter
JPS56136612A (en) * 1980-03-28 1981-10-26 Tokyo Giken Kogyo Kk Liquid filtering method
US4625923A (en) * 1985-07-01 1986-12-02 Semyon Fishgal Contaminants filtering and breaking
DE3840689A1 (de) * 1988-12-02 1990-06-07 Teves Gmbh Alfred Hydraulikpumpe
DE4107979C2 (de) 1991-03-13 1998-07-09 Bosch Gmbh Robert Hydraulische Hochdruckpumpe für Kraftfahrzeug-Bremsanlagen
DE4136590A1 (de) * 1991-11-07 1993-05-13 Bosch Gmbh Robert Pumpe
DE4202389A1 (de) * 1992-01-29 1993-08-05 Bosch Gmbh Robert Hydraulische bremsanlage, insbesondere fuer kraftfahrzeuge
DE4329211B4 (de) * 1993-08-31 2005-12-22 Robert Bosch Gmbh Hubkolbenpumpe mit einem Gehäuseblock und wenigstens einem Hubkolbenpumpenelement
WO1998012434A1 (fr) * 1996-09-19 1998-03-26 Robert Bosch Gmbh Pompe a piston
DE19732817B4 (de) * 1997-07-30 2005-06-30 Robert Bosch Gmbh Kolbenpumpe
KR100576980B1 (ko) * 1997-07-30 2006-05-10 로베르트 보쉬 게엠베하 피스톤 펌프
DE19800500A1 (de) * 1998-01-09 1999-07-15 Bosch Gmbh Robert Kolbenpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9966206A1 *

Also Published As

Publication number Publication date
JP2002518636A (ja) 2002-06-25
US6267569B1 (en) 2001-07-31
WO1999066206A1 (fr) 1999-12-23

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