WO2000006905A1 - Pompe a piston - Google Patents

Pompe a piston Download PDF

Info

Publication number
WO2000006905A1
WO2000006905A1 PCT/DE1999/000810 DE9900810W WO0006905A1 WO 2000006905 A1 WO2000006905 A1 WO 2000006905A1 DE 9900810 W DE9900810 W DE 9900810W WO 0006905 A1 WO0006905 A1 WO 0006905A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve seat
piston pump
piston
closing body
Prior art date
Application number
PCT/DE1999/000810
Other languages
German (de)
English (en)
Inventor
Wolfgang Schuller
Erika Mank
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 WO2000006905A1 publication Critical patent/WO2000006905A1/fr

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
    • 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
    • F04B53/121—Valves; Arrangement of valves arranged in or on pistons the valve being an annular ring surrounding the piston, e.g. an O-ring
    • 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
    • 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
    • F04B53/123—Flexible valves

Definitions

  • the invention relates to a piston pump according to the preamble of the main claim.
  • Piston pumps of this type are known per se.
  • a piston pump disclosed in DE 41 07 979 A1 which is provided for returning brake fluid from wheel brake cylinders in the event of a slip control or for building up brake pressure in a hydraulic vehicle brake system.
  • the known piston pump has a piston which can be driven by means of an eccentric element for a reciprocating stroke movement.
  • the piston of the known piston pump is guided axially displaceably in a liner, which is inserted into a pump bore in a pump housing. It is also possible to guide the piston directly in the pump bore, omitting the liner.
  • the known piston pump In order to control a flow direction of conveyed fluid through the piston pump, the known piston pump has an inlet and an outlet valve, both of which are designed as spring-loaded check valves.
  • the inlet valve is arranged on an end face of the piston located in the pump bore, the outlet valve is located on an outside of a liner bottom.
  • the two check valves of the well-known piston pump have a valve ball as a valve closing body, which are pressed against a valve seat by valve spring elements, in the inlet valve by a helical compression spring and in the outlet valve by spring tongues of a sheet metal cap.
  • These check valves require support for their valve spring elements; furthermore, in particular in the case of a helical compression spring as the valve spring element, an axial guidance of the valve closing body and the helical compression spring is to be considered in order to prevent lateral evasion of these two parts when the valve closing body is lifted off the valve seat.
  • the check valve has a band-shaped valve closing body.
  • the valve closing body is made of a resilient material, for example made of a metal sheet and forms in one piece with the
  • Valve closing body also a valve spring element.
  • the band-shaped valve closing body is fixed in such a way that it covers a valve seat and can be lifted off from the valve seat by an overpressure on an inflow side of the check valve relative to an outflow side, so that fluid flows through the check valve in an intended flow direction.
  • the piston pump according to the invention has the advantage that its check valve has a small space, which in particular allows the length of the piston pump to be shortened. Another advantage is a small clearance, which improves the efficiency of the piston pump.
  • An additional advantage is that the check valve has only one movable part, and that the movable part, namely the valve closing body, guides itself, so that separate guidance of the valve closing body and / or the valve spring element is unnecessary. The installation of the check valve is also low, the check valve is inexpensive to manufacture.
  • the band-shaped valve closing body of the check valve of the piston pump according to the invention consisting of spring-elastic material, can bear against the valve seat under prestress. Likewise, the valve closing body can only rest loosely on the valve seat, so that even a slight excess pressure to open the check valve is sufficient. It is also conceivable to design and arrange the band-shaped valve closing body such that it is at a distance from the valve seat in the undeformed basic state, that is to say the check valve is open in a basic position and is closed by an overpressure on the outflow side relative to the inflow side.
  • the piston pump has a prismatic valve seat part on which the valve seat is formed.
  • the valve seat part can be in one piece with another part of the piston pump and, for example, have the shape of a round or polygonal pin.
  • the valve seat is arranged on a side or circumferential surface of the valve seat part, which is completely or partially encompassed by the band-shaped valve closing body.
  • the band-shaped valve closing body is curved in a round or polygonal tube-like manner following an outline of the valve seat part, and is therefore designed to save space, resulting in a compact check valve which takes up little installation space.
  • valve closing body The attachment of the band-shaped valve closing body to the valve seat part is simple in this embodiment of the invention, since the valve closing body only has to be placed on the valve seat part, where it holds in the manner of a snap connection or a ring, without a separate fastening being necessary.
  • valve seat part is arranged on the piston of the piston pump and in particular in one piece with the piston (claim 4).
  • This embodiment of the invention has the advantage that, apart from the piston, only one part, namely the band-shaped valve closing body, is required for producing the check valve, which reduces the assembly effort to a minimum and reduces the manufacturing costs.
  • valve seat is designed as a raised, circumferential valve seat strip, on which the valve closing body rests sealingly when the check valve is closed.
  • the valve seat rail can For example, a triangular cross-section, ie have a sealing edge on which the valve closing body rests sealingly when the check valve is closed. This design of the valve seat results in a good sealing effect.
  • the check valve has a plurality of valve seats, which are jointly covered by the valve closing body.
  • the overall flow cross-section of the check valve is larger.
  • 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 required, for example, in the case of a brake system with wheel slip control (ABS or ASR) and / or in the case of a brake system (FDR) serving as steering aid and / or in the case of an electro-hydraulic 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 delivers the brake fluid into the wheel brake cylinder or into the wheel brake cylinders when an electric brake pedal sensor detects an actuation of the brake pedal or in which the pump is used to fill a reservoir serves the braking system.
  • EMS electro-hydraulic brake system
  • Figure 1 shows an axial section of a piston pump according to the invention
  • Figure 2 shows a cross section along line II-II in Figure 1 in a larger representation.
  • the piston pump according to the invention shown in the drawing is accommodated in a hydraulic block 12 of a slip-controlled hydraulic vehicle brake system (not shown).
  • a hydraulic block 12 of a slip-controlled hydraulic vehicle brake system (not shown).
  • further hydraulic components, not shown in the drawing such as solenoid valves, hydraulic accumulators and damper chambers are inserted and hydraulically with one another and with the piston pump 10 interconnected.
  • the hydraulic block 12 is connected to a master brake cylinder, not shown, via a main brake line, and wheel brake cylinders, not shown, are connected to the hydraulic block 12 via wheel brake lines.
  • the hydraulic block 12 forms a pump housing 12 of the piston pump 10 according to the invention and is referred to below as such.
  • a continuous pump bore 14 is provided in the pump housing 12, in which a piston 16 is received in an axially displaceable manner.
  • the piston 16 is composed in two parts from a thrust piece 18 and a valve piece 20.
  • the thrust piece 18 is made of steel by cold hammering, it protrudes from the pump bore 14 and has a hardened end face which forms a thrust face 22.
  • a cylindrical recess 24 is made coaxially in the thrust piece 18. In the field of Recess 24, windows 26 are recessed in a peripheral wall of the thrust piece 18.
  • the thrust piece 18 is placed with its recess 24 in the manner of a fit on a pin 28 of the valve piece 20, with an interference fit between the recess 24 and the pin 28, so that the thrust piece 18 is frictionally connected to the valve piece 20 by clamping force.
  • the valve piece 20 is made as an injection molded part made of fiber-reinforced plastic. It has a coaxial blind hole 30, which opens into the cylindrical recess 24 of the thrust piece 18 and ends closed at a free end of the valve piece 20.
  • the piston 16 is sealed with two sealing rings 32 in the pump bore 14, which are inserted into grooves in the valve piece 20 and in the thrust piece 18. Furthermore, a plastic guide ring 34 is inserted into the groove in the thrust piece 18, which guides the piston 16 in the pump bore 14 so as to be displaceable in the axial direction. Since the valve piece 20 is made of plastic, no guide ring is provided here.
  • a tubular filter 36 made of perforated plate with small holes is placed on the thrust piece 18, which filters brake fluid flowing into the piston pump 10.
  • an eccentric 38 which can be driven in rotation by an electric motor is provided on the side of the thrust piece 18 of the piston 16.
  • a piston return spring 40 designed as a helical compression spring which is inserted into the pump bore 14 on the side of the valve piece 20 of the piston 16 and on
  • Valve piece 20 engages, pushes the piston 16 in the direction of the eccentric 38 and thereby holds the piston 16 with its contact surface 22 in contact with a circumference of the eccentric 38.
  • the piston return spring 40 is supported on a cylindrical plug 42, which is inserted on the side of the valve piece 20 in the pump bore 14.
  • the piston pump 10 has a check valve designed according to the invention, which is arranged on the piston 16.
  • the valve piece 20 has a cylindrical pin, which is arranged on an end face of the valve piece 20 facing away from the thrust piece 18 and is integral with the valve piece 20.
  • the pin is arranged coaxially to the piston 16, it forms a valve seat part 46.
  • the blind hole 30 in the valve piece 20 extends into the valve seat part 46.
  • three radial valve bores 48 are made side by side, which pass from the blind hole 30 to the outer circumference of the valve seat part 46 designed as a pin (FIG. 2). Outer openings of the valve bores 48 form valve seats 50 of the inlet valve 44 of the piston pump 10.
  • valve bores 48 are surrounded by a valve seat strip 52 which is raised to the circumference of the cylindrical valve seat part 46 and has a triangular cross section, as a result of which a sealing edge is formed which is a good one Sealing of the inlet valve 44 causes in the closed state.
  • the valve seat part 46 designed as a pin has a flat, circumferential groove 54 at the level of the valve bores 48, into which a band-shaped valve closing body 56 is inserted.
  • the valve closing body 56 consists of a sheet-metal strip bent in a ring in the direction of its thickness, which occupies approximately a 3/4 circle on the circumference of the valve seat part 46.
  • the valve closing body 56 covers the valve seats 50 with its one end; it lies sealingly on the valve seats 50.
  • Valve piece 20 lifts the valve closing body 56 from the valve seats 50, so that the inlet valve 44 is open and brake fluid flows through it from the inside to the outside.
  • the valve closing body 56 also forms a valve spring element; due to its spring elasticity, it presses itself onto the valve seats 50, so that the inlet valve 44 is closed in its basic position.
  • the valve closing body 56 also automatically holds on the cylindrical valve seat part 46, since it encompasses this in an approximately 3/4 circle. To prevent rotation, the valve Bores 48 not overlapping end of the band-shaped valve closing body 56 to a nose 58 bent 90 ° inwards and engages in a recess in the valve seat part 46.
  • a pump inlet of the piston pump 10 takes place through an inlet bore 60 which is mounted radially to the pump bore 14 in the pump housing 12 and opens into the pump bore 14 approximately at the height of the window 26 of the thrust piece 18 of the piston 16.
  • Brake fluid flowing from the inlet bore 16 into the pump bore 14 flows through the filter sieve 36 and the windows 26 into the recess 24 of the thrust piece 18 and from there further into the blind hole 30 in the valve piece 20.
  • the recess 24 and the blind hole 30 form one on both Front closed central channel in the piston 16.
  • the brake fluid flows further from the blind hole 30 into the valve bores 48 of the inlet valve 44.
  • a pump outlet takes place through a blind hole 62 in the sealing plug 42, from which a radial hole 64 leads to an annular channel 66 which surrounds the sealing plug 42 between the latter and a wall of the pump hole 14.
  • An outlet bore 68 extends from the annular channel 66 and is made radially to the pump bore 14 in the pump housing 12.
  • a spring-loaded check valve is housed as an outlet valve 70, which is shown in the drawing as a symbol.
  • the plug 42 is by a circumferential caulking 72 of the
  • Pump housing 12 fastens the pump bore 14 in a pressure-tight manner in the end of the pump bore 14 facing away from the eccentric 38.

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)

Abstract

L'invention concerne une pompe à piston (10) destinée à une installation de freinage de véhicule hydraulique, en particulier à régulation antipatinage. Il est proposé, selon l'invention, d'utiliser comme soupape d'entrée (44) un téton (46), monté sur un piston (16) de façon à ne former avec celui-ci qu'une seule pièce, dans lequel se trouve un alésage de soupape (48) radial dont l'orifice extérieur forme un siège de soupape (50) qui est recouvert par un obturateur (56) courbé, en tôle métallique, en forme de cercle partiel. L'invention offre un avantage résidant dans le fait que la soupape d'entrée (44) de cette pompe à piston (10) peut être fabriquée de façon simple et économique, qu'elle ne nécessite qu'un faible espace d'installation et qu'elle ne présente qu'un faible espace mort.
PCT/DE1999/000810 1998-07-28 1999-03-22 Pompe a piston WO2000006905A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998133840 DE19833840A1 (de) 1998-07-28 1998-07-28 Kolbenpumpe
DE19833840.6 1998-07-28

Publications (1)

Publication Number Publication Date
WO2000006905A1 true WO2000006905A1 (fr) 2000-02-10

Family

ID=7875513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/000810 WO2000006905A1 (fr) 1998-07-28 1999-03-22 Pompe a piston

Country Status (2)

Country Link
DE (1) DE19833840A1 (fr)
WO (1) WO2000006905A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004037624A1 (fr) * 2002-10-26 2004-05-06 Continental Teves Ag & Co. Ohg Dispositif de transport

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10019403A1 (de) * 2000-04-19 2001-10-25 Bosch Gmbh Robert Rückschlagventil für eine Kolbenpumpe
DE10118925C1 (de) * 2001-04-18 2003-01-09 Bosch Gmbh Robert Kolbenpumpe
DE102017128221A1 (de) * 2017-11-29 2019-05-29 S O L O Kleinmotoren Gesellschaft Mit Beschränkter Haftung Druckbegrenzungsventil mit reduzierter Zahl von Bauteilen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2043002A1 (de) * 1970-08-29 1972-03-02 Ishkewich M Druck und Saugventil
US3787145A (en) * 1972-02-18 1974-01-22 Beatrice Foods Co Mixing pump assembly
DE2647768A1 (de) * 1976-10-22 1978-04-27 Barmag Barmer Maschf Radialkolbenpumpe
GB2021682A (en) * 1978-05-23 1979-12-05 Poclain Hydraulics Sa Fluid pump
WO1990015247A1 (fr) * 1989-06-07 1990-12-13 Zahnradfabrik Friedrichshafen Ag Pompe a pistons radiaux
DE4107979A1 (de) 1991-03-13 1992-09-17 Bosch Gmbh Robert Hydraulische hochdruckpumpe fuer kraftfahrzeug-bremsanlagen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1674718A (en) * 1927-03-07 1928-06-26 Dueo Company Valve for pumps
DE19712147A1 (de) * 1996-09-19 1998-03-26 Bosch Gmbh Robert Kolbenpumpe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2043002A1 (de) * 1970-08-29 1972-03-02 Ishkewich M Druck und Saugventil
US3787145A (en) * 1972-02-18 1974-01-22 Beatrice Foods Co Mixing pump assembly
DE2647768A1 (de) * 1976-10-22 1978-04-27 Barmag Barmer Maschf Radialkolbenpumpe
GB2021682A (en) * 1978-05-23 1979-12-05 Poclain Hydraulics Sa Fluid pump
WO1990015247A1 (fr) * 1989-06-07 1990-12-13 Zahnradfabrik Friedrichshafen Ag Pompe a pistons radiaux
DE4107979A1 (de) 1991-03-13 1992-09-17 Bosch Gmbh Robert Hydraulische hochdruckpumpe fuer kraftfahrzeug-bremsanlagen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004037624A1 (fr) * 2002-10-26 2004-05-06 Continental Teves Ag & Co. Ohg Dispositif de transport
US7478998B2 (en) 2002-10-26 2009-01-20 Continental Teves Ag & Co. Ohg Conveyor device

Also Published As

Publication number Publication date
DE19833840A1 (de) 2000-02-03

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