EP0931218A1 - Pompe a piston - Google Patents

Pompe a piston

Info

Publication number
EP0931218A1
EP0931218A1 EP98945034A EP98945034A EP0931218A1 EP 0931218 A1 EP0931218 A1 EP 0931218A1 EP 98945034 A EP98945034 A EP 98945034A EP 98945034 A EP98945034 A EP 98945034A EP 0931218 A1 EP0931218 A1 EP 0931218A1
Authority
EP
European Patent Office
Prior art keywords
piston
filter
liner
piston pump
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Withdrawn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
EP98945034A
Other languages
German (de)
English (en)
Inventor
Manfred Hauser
Norbert Alaze
Thorsten DÜRMEIER
Ursula Eckstein
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 DE19831450A external-priority patent/DE19831450A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0931218A1 publication Critical patent/EP0931218A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/144—Adaptation of piston-rods
    • F04B53/146—Piston-rod guiding arrangements
    • 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
    • F04B53/144—Adaptation of piston-rods
    • F04B53/147—Mounting or detaching of piston 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
    • F04B53/20—Filtering

Definitions

  • the invention relates to a piston pump according to the preamble of the main claim.
  • Such a piston pump is known from DE 40 27 794 A1.
  • the known piston pump has a rod-shaped piston which is accommodated in an axially displaceable manner in a liner which is inserted into a pump housing. One end of the piston protrudes from the liner. At this end of the piston, the piston is driven to a reciprocating reciprocating movement in the axial direction by means of an eccentric which can be driven by an electric motor and which acts on the piston on its end face protruding from the liner.
  • the piston is guided axially displaceably in the liner by means of a plastic guide ring inserted into the liner. At its end protruding from the liner, the piston is guided axially displaceably in the pump housing by means of a further plastic guide ring which is inserted into the pump housing.
  • the piston pump according to the invention with the features of the main claim has a filter element, which initially has the advantage that the fluid pumped by the piston pump is filtered.
  • the filter element is preferably in Arranged area of the piston pump and thereby prevents dirt particles from getting into the piston pump.
  • the filter element is attached to the liner in an extension of the liner and has a guide element which axially displaceably guides the piston outside the liner to the liner.
  • the invention enables the use of a sealing ring with a larger cross section for sealing the piston in the pump housing on the side of the piston protruding from the liner, without increasing the overall length of the piston pump.
  • a sealing ring of larger cross section reduces leakage of the piston pump in the direction of the eccentric that drives the piston, since the sealing ring has a larger volume of wear.
  • 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 to a master brake cylinder (ABS) and / or to convey brake fluid from a reservoir to a wheel brake cylinder or to several wheel brake cylinders (ASR or FDR or EHB) .
  • the pump is used, for example, in a brake system with wheel slip control (ABS or ASR) and / or a braking system (FDR) serving as a steering aid and / or an electro-hydraulic braking 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 delivers the brake fluid into the wheel brake cylinder or in the wheel brake cylinders when an electric brake pedal sensor detects an actuation of the brake pedal or in which the pump for filling a memory of the brake system serves.
  • EMS electro-hydraulic brake system
  • the invention is explained in more detail below with the aid of an exemplary embodiment which is shown in the drawing and is preferably selected.
  • the single figure shows a piston pump according to the invention in an axial section.
  • the piston pump according to the invention shown overall in FIG. 1, has a liner 12 with a liner bottom 13 that is integral with it, which is inserted into a stepped pump bore 14 of a hydraulic block, which forms a pump housing 16.
  • the hydraulic block of which only a fragment surrounding piston pump 10 is shown in the drawing, is part of a slip-controlled hydraulic vehicle brake system, which is otherwise not shown.
  • further hydraulic components such as solenoid valves and hydraulic accumulators are used in it, and a master brake cylinder and wheel brake cylinder are connected (not shown).
  • the hydraulic components are hydraulically interconnected by means of the hydraulic block.
  • a piston 18 is received in the bushing 12 over approximately the length of its length.
  • the piston 18 is composed in two parts of a valve part 20 and a thrust piece 22.
  • the valve part 20 is a rotationally symmetrical part, which is produced by injection molding from fiber-reinforced plastic and is provided with an axial through hole 24.
  • the valve part 20 is axially displaceably received in the liner 12, it is sealed with a sealing ring 26 in the liner 12. Since the valve part 20 is made of plastic, it is guided directly in the bushing 12, that is to say without using a guide ring or the like.
  • the valve part 20 has a coaxial connecting pin 28 which is integral with it and which projects from the valve part 20 on an open side of the bushing 12.
  • the thrust piece 22 is pressed onto the connecting pin 28.
  • the thrust piece 22 is a hollow cylindrical part made in particular by shaping such as cold hammering from metal, which is formed closed at its end facing away from the valve part 20 by an end wall 30 integral with the thrust piece 22.
  • the end wall 30 forms a contact surface 32.
  • the contact piece 22 is hardened, at least in the region of the end wall 30, in order to increase the wear resistance.
  • the thrust piece 22 is press-fitted to the connecting pin 28 of the valve member 20, i.e. the thrust piece 22 holds frictionally on the connecting pin 28 by a clamping force. 22 inlet holes 34 are provided in a peripheral wall of the thrust piece for fluid inlet.
  • the filter 36 has a filter frame 38, 40, 42 with filter webs 38 running parallel to the axis, which integrally connect two filter rings 40, 42 arranged at a distance from one another.
  • the filter frame 38, 40, 42 is an injection molded part made of fiber-reinforced plastic.
  • the filter webs 38 and the filter rings 40, 42 frame filter windows 44, in which a filter material (filter fabric) or a perforated plate is arranged as a filter sieve 46.
  • the filter screen 46 is tubular, it is continuous in the circumferential direction and is encapsulated with the filter frame 38, 40, 42, so that the filter screen 46 completely fills the filter window 44.
  • the filter ring 40 facing the bushing 12 is designed as a flange 40 projecting outward from the filter 36 as a fastening ring 40.
  • an end edge 48 of the bushing 12 is formed at the open end of the bushing 12 so as to stand outwards.
  • the fastening ring 40 of the filter 36 is formed, for example by hot stamping, over and behind the obliquely outward-facing end edge 48 of the bushing 12, as a result of which the filter 36 coaxially extends the bushing 12 on the open end face of the bushing 12.
  • the filter ring 40 fastened to the end edge 48 of the liner 12 and forming the fastening ring of the filter 36 has a larger inner diameter than an outer diameter of the thrust piece 22 of the piston 18, the fastening ring 40 is radially spaced from the thrust piece 22.
  • the filter webs 38 are also at a radial spacing arranged outside the thrust piece 22 of the piston 18.
  • the filter ring 42 remote from the bushing 12 has a smaller diameter than the filter ring 40 arranged at the front edge 48 of the bushing 12, the filter ring 42 remote from the bushing 12 is opposite the filter ring 40 arranged at the front edge 48 of the bushing 12 and opposite the filter webs 38 .
  • the filter ring 42 remote from the bushing 12 has an inner diameter corresponding to the outer diameter of the thrust piece 22 of the piston 18, it forms a guide ring 42 which axially guides the piston 18 to the bushing 12 on its thrust piece 22 projecting from the bushing 12.
  • the guide ring 42 which is integral with the filter 36 lies in the manner of a fit in the pump bore 14 in the pump housing 16, as a result of which an axial arrangement of the guide ring 42 and thus axial guidance of the piston 18 on its thrust piece 22 is ensured.
  • an O-ring 50 is inserted as a sealing ring in an annular step of the pump bore 14, which is held in its position in the pump bore 14 by the filter ring 42 forming the guide ring and which seals the piston 18 in the pump housing 16.
  • the filter 36 also forms an anti-loss device for the piston 18 in the bushing 12.
  • the inner diameter of the end face 48 of the bushing 12 arranged filter ring 40 is smaller than an outer diameter of the valve part 20 of the piston 18 outside the connecting pin 28, so that the filter ring 40 arranged on the end edge 48 of the bushing 12 pushes the piston 18 on the valve part 20 or on a flange ring 52 of the starting Piece 22, which rests on the valve part 20, holds in the liner 12.
  • a fluid inlet takes place through an inlet bore 54, which is made radially to the pump bore 14 in the pump housing 16 and opens into the pump bore 14 approximately at the level of the filter 36.
  • Brake fluid flowing from the inlet bore 54 into the piston pump 10 enters the pump bore 14 and from there through the filter windows 44 and the inlet holes 34 in the thrust piece 22 of the piston 18 into the hollow cylindrical thrust piece 22.
  • the brake fluid flows through the through hole 24 of the Valve part 20 to an inlet valve 56, which is arranged on a side of the valve part 20 facing a liner bottom 13.
  • the inlet valve 56 of the piston pump 10 is designed as a spring-loaded check valve.
  • An opening of the through hole 24 in the valve part 20 is designed as a conical valve seat 60, against which a valve ball 62 as a valve closing body by a helical compression spring
  • Venti closing spring 64 is pressed.
  • the valve closing spring 64 is supported against a bottom of a cup-shaped valve cage 66, which is made of sheet metal as a deep-drawn part and has passages 68.
  • the valve cage 66 On its open side, the valve cage 66 has a circumferential ring step 70, with which it rests on the end face of the valve part 20 of the piston 18, and a radial flange 72, on which it is pressed by a piston return spring 74 against the end face of the valve part 20 of the piston 18 becomes.
  • Valve ball 62 and valve closing spring 64 are received in valve cage 66.
  • the piston return spring 74 is supported against the liner bottom 13. It is designed to be considerably stronger than the valve closing spring 64, so that the piston return spring 74 holds the valve cage 66 securely against the force of the valve closing spring 64 on the valve part 20 under all loads occurring during the operation of the piston pump 10.
  • the piston pump 10 To drive the piston 18 to a reciprocating reciprocating movement in the axial direction, the piston pump 10 according to the invention has an electro- Motor-driven eccentric 76, against the circumference of which the piston 18 is pressed with its contact surface 32 by the piston return spring 74.
  • the O-ring 50 located in the bushing 12 is held with play in the axial direction between the radial flange 72 of the valve cage 66 and an annular step 78 on the valve part 20 of the piston 18.
  • a cylindrical closure element 80 is placed on the liner bottom 13 and connected to the liner 12 with a flange 82.
  • Closure element 80 closes the pump bore 14 in a pressure-tight manner and fixes the liner 12 in the pump housing 16.
  • An outlet valve 84 in the form of a spring-loaded check valve is accommodated in the closure element 80:
  • the closure element 80 has a coaxial blind bore 86 into which a helical compression spring as valve closing spring 88 and a valve ball 90 as
  • Valve closing bodies are used.
  • the valve ball 90 interacts with a conical valve seat 92, which is attached to an outside of the liner base 13 at an opening of a central bore 94 which axially penetrates the liner base 13.
  • the valve seat 92 is shaped and solidified by stamping. Brake fluid delivered with the piston pump 10 is discharged through radial channels 96 between the liner base 13 and the closure element 80 into a radial outlet bore 98 in the pump housing 16.
  • the filter ring 42 which forms the guide ring 42 for the piston 18, is arranged at a distance from the liner 12 and lies in the pump housing 14, and has the function of guiding the piston 18 axially when the piston pump according to the invention is in operation, the piston up to Inserting the liner 12 into the pump housing 16 to keep it axially aligned in the liner 12.
  • the guide ring 42 prevents the piston 18 from sloping in the liner 12, so that the liner 12 with the piston 18 inserted into it can be inserted and pressed into the pump bore 14 without problems, without the piston on the pump housing 16 or a step or the like.
  • the pump bore 14 abuts.
  • the piston 18 with the O-ring 50, with the inlet valve 56 placed on the piston 18 and the piston return spring 74 placed on the inlet valve 56 is inserted into the liner 12.
  • the filter 36 is placed on the front edge 48 of the liner 12 and connected to the liner 12 by hot stamping its fastening ring 40.
  • the filter 36 forming the captive retainer holds the piston 18 with the inlet valve 56 and the piston return spring 74 in the bushing 12.
  • the attachment of the closure element 80, in which the outlet valve 84 is inserted, with the flange 82 on the bushing 12 can be before or after Insert the piston 18 and attach the filter 36 to the liner 12.
  • the liner 12 with the inserted piston 18, the attached filter 36 and the attached closure element 80 forms a preassembly, which is completely assembled and inserted into the pump bore 14 and pressed in and fastened in a pressure-tight manner in the pump housing 16 by a circumferential caulking 100 of the pump housing 16.

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)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

L'invention concerne une pompe à piston (10) destinée à une installation de freinage hydraulique pour véhicule, à régulation antipatinage. Il est proposé, selon l'invention, de placer un filtre (36) tubulaire sur une boîte de glissement (12) de la pompe à piston (10), filtre qui présente une bague (42) formant une bague de guidage (42), qui est placée à une certaine distance de la boîte de glissement (12) et qui guide axialement le piston (18) sur une partie dépassant de la boîte de glissement (12). Grâce à l'invention, on peut se passer d'une bague de guidage séparée et réduire la longueur hors tout de la pompe à piston (10).
EP98945034A 1997-07-30 1998-07-23 Pompe a piston Withdrawn EP0931218A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19732812 1997-07-30
DE19732812 1997-07-30
DE19831450 1998-07-14
DE19831450A DE19831450A1 (de) 1997-07-30 1998-07-14 Kolbenpumpe
PCT/DE1998/002070 WO1999006698A1 (fr) 1997-07-30 1998-07-23 Pompe a piston

Publications (1)

Publication Number Publication Date
EP0931218A1 true EP0931218A1 (fr) 1999-07-28

Family

ID=26038691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98945034A Withdrawn EP0931218A1 (fr) 1997-07-30 1998-07-23 Pompe a piston

Country Status (4)

Country Link
US (1) US6224352B1 (fr)
EP (1) EP0931218A1 (fr)
JP (1) JP2001501283A (fr)
WO (1) WO1999006698A1 (fr)

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JP4622802B2 (ja) * 2005-02-10 2011-02-02 株式会社アドヴィックス ピストンポンプ
US20070041850A1 (en) * 2005-08-19 2007-02-22 Kelsey-Hayes Company Multi-piston pump and valve arrangement
DE102006010674A1 (de) * 2005-09-14 2007-03-15 Continental Teves Ag & Co. Ohg Kolbenpumpe
KR101021532B1 (ko) * 2005-11-23 2011-03-16 주식회사 만도 브레이크 시스템의 펌프
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JP4705551B2 (ja) * 2006-10-30 2011-06-22 日信工業株式会社 往復動ポンプ
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DE102006054061A1 (de) * 2006-11-16 2008-05-21 Robert Bosch Gmbh Kolbenpumpe für ein Fahrzeugbremssystem
US20090057345A1 (en) * 2007-08-31 2009-03-05 Dukes Stephen A Fluid dispenser
DE102007047418A1 (de) * 2007-10-04 2009-04-23 Robert Bosch Gmbh Kolbenpumpe zur Förderung eines Fluids und zugehöriges Bremssystem
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US8986253B2 (en) 2008-01-25 2015-03-24 Tandem Diabetes Care, Inc. Two chamber pumps and related methods
US8408421B2 (en) 2008-09-16 2013-04-02 Tandem Diabetes Care, Inc. Flow regulating stopcocks and related methods
AU2009293019A1 (en) 2008-09-19 2010-03-25 Tandem Diabetes Care Inc. Solute concentration measurement device and related methods
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WO2011014704A2 (fr) 2009-07-30 2011-02-03 Tandem Diabetes Care, Inc. Système de pompe de perfusion à cartouche jetable comprenant une décharge de pression et une rétroaction de pression
JP5471229B2 (ja) * 2009-09-18 2014-04-16 株式会社アドヴィックス ピストンポンプ
DE102009046351A1 (de) * 2009-11-03 2011-05-19 Robert Bosch Gmbh Kolben einer Kolbenpumpe mit einer Metallhülse
DE102010030329A1 (de) * 2010-06-22 2011-12-22 Robert Bosch Gmbh Kolbenpumpe
DE102010030498A1 (de) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe
WO2012012896A1 (fr) * 2010-07-24 2012-02-02 Clayton Hoffarth Pompe de fond de trou munie d'une soupape de séquence
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Also Published As

Publication number Publication date
JP2001501283A (ja) 2001-01-30
US6224352B1 (en) 2001-05-01
WO1999006698A1 (fr) 1999-02-11

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