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WO2018024381A1 - Vehicle brake system piston pump comprising a lubricant - Google Patents

Vehicle brake system piston pump comprising a lubricant Download PDF

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Publication number
WO2018024381A1
WO2018024381A1 PCT/EP2017/061147 EP2017061147W WO2018024381A1 WO 2018024381 A1 WO2018024381 A1 WO 2018024381A1 EP 2017061147 W EP2017061147 W EP 2017061147W WO 2018024381 A1 WO2018024381 A1 WO 2018024381A1
Authority
WO
WIPO (PCT)
Prior art keywords
lubricant
eccentric
vehicle brake
brake system
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.)
Ceased
Application number
PCT/EP2017/061147
Other languages
German (de)
French (fr)
Inventor
Franz Hanschek
Oliver Gaertner
Harald Hermann
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
Priority to CN201780047442.3A priority Critical patent/CN109563820A/en
Priority to KR1020197003047A priority patent/KR20190033547A/en
Priority to JP2019504856A priority patent/JP2019525059A/en
Publication of WO2018024381A1 publication Critical patent/WO2018024381A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics
    • 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
    • F04B53/18—Lubricating
    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/38—Lubricating compositions characterised by the base-material being a macromolecular compound containing halogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/81—Braking systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/11—Kind or type liquid, i.e. incompressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/98—Lubrication

Definitions

  • the invention relates to a vehicle brake system piston pump, in which a piston by means of an eccentric is movable back and forth, between the piston and the eccentric a friction surface is formed and on the friction surface, a lubricant is provided.
  • Vehicles especially passenger cars, are usually equipped with a vehicle brake system with at least one wheel brake for braking a wheel of this vehicle.
  • the wheel brake is often designed hydraulically and is of a fluid or brake fluid, which is located within a fluid line, flowed.
  • a switched into the fluid line hydraulic unit sets the fluid by means of an associated
  • Vehicle brake system piston pump under pressure It comes in
  • slidable piston is used, which is driven by an eccentric.
  • the eccentric runs in an eccentric space.
  • the eccentric thus converts its rotating movement into a linear movement of the piston.
  • the eccentric rubs against a face of the piston acting as a friction surface.
  • a lubricant is provided to reduce friction.
  • a lubricating film of oil or grease between the piston and the eccentric is usually formed.
  • a lubricant as known from DE 697 23 040, a layer of a self-lubricating material is provided.
  • a vehicle brake system piston pump in which a piston can be moved back and forth by means of an eccentric, a friction surface is formed between the piston and the eccentric, and a lubricant is provided on the friction surface.
  • the lubricant is as a
  • the lubricant between the piston and the eccentric serves to reduce friction on the friction surface. Since the lubricant consumes or the lubricating layer wears, the amount of the lubricant or the thickness of the lubricating layer determines the
  • the vehicle brake system piston pump according to the invention has
  • Lubricant that is designed as a pourable dry substance.
  • Bulkable refers to a particulate or granular mixture that is to be moved in a space or container.
  • the property of bulkability is determined by the particle size, the particle distribution, the bulk density, the
  • Angle of repose which determines humidity and temperature.
  • the moisture is low in the lubricant according to the invention or the lubricant is formed as a dry matter.
  • the dry matter of this type is located at or in the vicinity of the friction surface between the piston and the eccentric.
  • the dry matter passes between eccentric and piston.
  • On the friction surface individual particles or grains of the lubricant are placed between the piston and the eccentric, thus forming a friction-reducing lubricating effect.
  • the particles are usually arranged side by side on the friction surface.
  • the pourability of the lubricant according to the invention makes it possible for other particles to reach the friction surface over and over again. At the same time that is
  • the eccentric is advantageously arranged in an eccentric space in which the lubricant is retained.
  • the vehicle brake system piston pump is designed such that the lubricant in the
  • the eccentric rotates with a shaft, wherein the center of gravity of the eccentric lies outside the axis of rotation of this shaft.
  • Around the eccentric around the eccentric space is formed, which surrounds the eccentric.
  • the inventive dry and at the same time pourable lubricant is advantageously circulated in this way.
  • the eccentric space thus serves as a storage space and at the same time as a circulation space for the lubricant.
  • the lubricant has such a strength that it is deformable between the piston and the eccentric.
  • Strength is the property of a substance, in this case the lubricant, to deform under a force.
  • the strength is advantageous so that the lubricant is crushed or crushed during movement of the eccentric and piston between the piston and the eccentric.
  • the individual particles of the lubricant according to the invention are thereby pressed flat and increase their areal extent.
  • the thus enlarged areal extent of the individual particles of the lubricant increases overall the surface of the lubricating layer between the piston and the eccentric.
  • each individual particle acts as a "platelike" platelet, these platelets in particular lying next to one another and thus forming a lubricating layer, by means of which the piston is spaced from the eccentric.
  • the lubricant is formed so that the lubricant is formed of a plurality of particles, each having a spherical shape.
  • the spherical shape of the individual particles allows a particularly easy-flowing, advantageous moving of the lubricant within the eccentric space by means of the Eccentric.
  • the individual spherical particles roll off each other as the particles move.
  • the lubricant is formed so that the lubricant is formed from a plurality of particles, each having a lens shape.
  • a lens mold represents a deformed sphere in which two opposite sides of the sphere are flattened. In optics, this lens shape is also referred to as a biconvex lens. In the present case, the lens shape has the advantage that the associated particles more easily slip between the eccentric and the piston due to the flattened shape.
  • Another advantage is that a lenticular particle rests with the flattened sides between the piston and the eccentric.
  • the lens thus arranged is further deformed by the piston and cylinder into a disk.
  • the lubricant is made of polytetrafluoroethylene.
  • Polytetrafluoroethylene also known as PTFE, is advantageously suitable herein as a dry lubricant, since PTFE has a very low dynamic coefficient of friction of 0.07 (in words: zero point zero seven).
  • the lubricant formed with PTFE is advantageously provided with additives, in particular graphite.
  • the lubricant according to the invention preferably has a shore
  • Hardness D is between 50 and 80 (in words: between fifty and eighty), especially between 55 and 70 (in words: between fifty-five and seventy). To measure the Shore D hardness is determined by means of a
  • the lubricant according to the invention is thus advantageously designed as a pourable dry substance.
  • the lubricant preferably consists of a plurality of particles, each having a spherical shape or lens shape.
  • the lubricant is made of polytetrafluoroethylene (PTFE).
  • the lubricant is made of molybdenum (IV) sulfide or perfluoroalkoxy polymer (PFA).
  • Other advantageous materials are polyetheretherketone (PEEK) or a special form of polyethylene ultrahigh molecular weight high density polyethylene (PE-UHMW).
  • PEEK polyetheretherketone
  • PE-UHMW polyethylene ultrahigh molecular weight high density polyethylene
  • the lubricant according to the invention is advantageously also designed as a mixture of different lubricants.
  • the invention is accordingly further directed to a use of such lubricant according to the invention in a vehicle brake system piston pump.
  • Fig. 2 is a partial longitudinal section of an inventive
  • FIG. 3 is a detail view of a first variant of FIG. 2,
  • FIG. 4 is a detail view of a second variant of FIG. 2,
  • Fig. 1 shows a portion of a vehicle brake system piston pump 10 which serves to generate hydraulic pressure on wheel brakes of a vehicle.
  • the pressure is generated by means of the vehicle brake system piston pump 10 by a piston 12 moves into a pressure chamber 14 while a
  • Liquid 16 is pressurized relative to the environment.
  • the movement of the piston 12 is generated by means of an eccentric 18, which rotates in an eccentric space 20.
  • the eccentric 18 is coupled to a rotatable eccentric shaft 22 stationary. The eccentric 18 converts so the
  • the eccentric 18 is eccentrically mounted on the eccentric shaft 22, which means that its gravity point 24 is located outside the axis 26 of the eccentric shaft 22. In this arrangement is within the eccentric space 20 between the
  • Eccentric 18 and an inner wall 28 of the eccentric 20 a cavity 30 is formed. This cavity 30 changes during the movement of the eccentric 18 on the eccentric shaft 22 its shape.
  • the lubricant 34 is formed in a conventional manner as a grease.
  • the grease lubricates during a movement of the
  • a structurally similarsammlungmsanlagen- piston pump 10 is illustrated, in which according to the invention, the lubricant 32 is formed as a pourable dry matter 36.
  • the dry matter 36 comprises a multiplicity of particles 38 which, according to FIGS. 2 and 3, each have a spherical shape.
  • FIG. 4 shows the dry matter 36 in an embodiment in which the particles 38 each have a lens shape.
  • the dry substance 36 is mounted within the eccentric space 20.
  • the dry matter 36 is conveyed to the friction surface 32 between the pistons 12 and the eccentric 18 during the movement of the eccentric 18.
  • the individual particles 38 of the dry substance 36 are between the piston 12 and the eccentric 18 compressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Transportation (AREA)
  • Lubricants (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Reciprocating Pumps (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a vehicle brake system piston pump, in which a piston is movable back and forth by means of an eccentric. A friction surface is formed between the piston and the eccentric, and a lubricant is provided on the friction surface, wherein according to the invention the lubricant is formed by a pourable dry substance.

Description

Beschreibung  description

Titel title

Fahrzeugbremsanlagen-Kolbenpumpe mit einem Schmiermittel Stand der Technik  Vehicle brake system piston pump with a lubricant state of the art

Die Erfindung betrifft eine Fahrzeugbremsanlagen-Kolbenpumpe, bei der ein Kolben mittels eines Exzenters hin und her bewegbar ist, zwischen dem Kolben und dem Exzenter eine Reibfläche ausgebildet ist und an der Reibfläche ein Schmiermittel vorgesehen ist. The invention relates to a vehicle brake system piston pump, in which a piston by means of an eccentric is movable back and forth, between the piston and the eccentric a friction surface is formed and on the friction surface, a lubricant is provided.

Fahrzeuge, insbesondere Personenkraftwagen, sind in der Regel mit einer Fahrzeugbremsanlage mit mindestens einer Radbremse zum Bremsen eines Rades dieses Fahrzeugs ausgestattet. Die Radbremse ist dabei oftmals hydraulisch ausgeführt und ist von einem Fluid bzw. Bremsfluid, welches sich innerhalb einer Fluidleitung befindet, angeströmt. Ein in die Fluidleitung geschaltetes Hydraulikaggregat setzt das Fluid mittels einer zugehörigen Vehicles, especially passenger cars, are usually equipped with a vehicle brake system with at least one wheel brake for braking a wheel of this vehicle. The wheel brake is often designed hydraulically and is of a fluid or brake fluid, which is located within a fluid line, flowed. A switched into the fluid line hydraulic unit sets the fluid by means of an associated

Fahrzeugbremsanlagen-Kolbenpumpe unter Druck. Dabei kommt ein Vehicle brake system piston pump under pressure. It comes in

verschiebbarer Kolben zum Einsatz, der von einem Exzenter angetrieben wird. Der Exzenter läuft in einem Exzenterraum um. Der Exzenter setzt seine drehende Bewegung also in eine lineare Bewegung des Kolbens um. Während seiner Bewegung reibt der Exzenter an einer als Reibfläche wirkenden Stirnseite des Kolbens. An der Reibfläche ist zur Minderung von Reibung ein Schmiermittel vorgesehen. Als Schmiermittel ist in der Regel ein Schmierfilm aus Öl oder Schmierfett zwischen dem Kolben und dem Exzenter ausgebildet. Insbesondere ist als Schmiermittel, wie aus DE 697 23 040 bekannt, eine Schicht aus einem selbstschmierenden Material vorgesehen. slidable piston is used, which is driven by an eccentric. The eccentric runs in an eccentric space. The eccentric thus converts its rotating movement into a linear movement of the piston. During its movement, the eccentric rubs against a face of the piston acting as a friction surface. On the friction surface, a lubricant is provided to reduce friction. As a lubricant, a lubricating film of oil or grease between the piston and the eccentric is usually formed. In particular, as a lubricant, as known from DE 697 23 040, a layer of a self-lubricating material is provided.

Offenbarung der Erfindung Erfindungsgemäß ist eine Fahrzeugbremsanlagen-Kolbenpumpe geschaffen, bei der ein Kolben mittels eines Exzenters hin und her bewegbar ist, zwischen dem Kolben und dem Exzenter eine Reibfläche ausgebildet ist und an der Reibfläche ein Schmiermittel vorgesehen ist. Dabei ist das Schmiermittel als ein Disclosure of the invention According to the invention, a vehicle brake system piston pump is provided, in which a piston can be moved back and forth by means of an eccentric, a friction surface is formed between the piston and the eccentric, and a lubricant is provided on the friction surface. The lubricant is as a

schüttfähiger Trockenstoff ausgebildet. pourable dry matter formed.

Bei Fahrzeugbremsanlagen-Kolbenpumpen dient das Schmiermittel zwischen dem Kolben und dem Exzenter dazu, an der Reibfläche Reibung zu verringern. Da das Schmiermittel sich verbraucht bzw. die Schmierschicht sich abnutzt, bestimmt die Menge des Schmiermittels bzw. die Dicke der Schmierschicht dieIn vehicle brake piston pumps, the lubricant between the piston and the eccentric serves to reduce friction on the friction surface. Since the lubricant consumes or the lubricating layer wears, the amount of the lubricant or the thickness of the lubricating layer determines the

Dauer, wie gut, insbesondere wie lange, zwischen Kolben und Exzenter geschmiert ist. Die Qualität der Schmierwirkung hat einen Einfluss auf die Lebensdauer der Fahrzeugbremsanlagen-Kolbenpumpe. Duration, how well, especially how long, between the piston and eccentric is lubricated. The quality of the lubricating effect has an influence on the service life of the vehicle brake system piston pump.

Die erfindungsgemäße Fahrzeugbremsanlagen-Kolbenpumpe weist ein The vehicle brake system piston pump according to the invention has

Schmiermittel auf, dass als ein schüttfähiger Trockenstoff ausgebildet ist. Lubricant that is designed as a pourable dry substance.

Schüttfähig bezeichnet ein partikelartiges bzw. körniges Gemenge, das in einem Raum bzw. Behältnis zu bewegen ist. Die Eigenschaft der Schüttfähigkeit wird durch die Partikelgröße, die Partikelverteilung, die Schüttdichte, den Bulkable refers to a particulate or granular mixture that is to be moved in a space or container. The property of bulkability is determined by the particle size, the particle distribution, the bulk density, the

Schüttwinkel, die Feuchtigkeit und die Temperatur bestimmt. Die Feuchtigkeit ist bei dem erfindungsgemäßen Schmiermittel gering bzw. das Schmiermittel ist als Trockenstoff ausgebildet. Der derartige Trockenstoff befindet sich an bzw. in der Nähe der Reibfläche zwischen Kolben und Exzenter. Der Trockenstoff gelangt dabei zwischen Exzenter und Kolben. An der Reibfläche legen sich einzelne Partikel bzw. Körner des Schmiermittels zwischen den Kolben und den Exzenter und es bildet sich so eine reibungsmindernde Schmierwirkung aus. Die Partikel sind dabei in der Regel auf der Reibfläche nebeneinander liegend angeordnet. Angle of repose, which determines humidity and temperature. The moisture is low in the lubricant according to the invention or the lubricant is formed as a dry matter. The dry matter of this type is located at or in the vicinity of the friction surface between the piston and the eccentric. The dry matter passes between eccentric and piston. On the friction surface, individual particles or grains of the lubricant are placed between the piston and the eccentric, thus forming a friction-reducing lubricating effect. The particles are usually arranged side by side on the friction surface.

Die Schüttfähigkeit des erfindungsgemäßen Schmiermittels ermöglichst es, dass immer wieder andere Partikel zu der Reibfläche gelangen. Zugleich ist dasThe pourability of the lubricant according to the invention makes it possible for other particles to reach the friction surface over and over again. At the same time that is

Schmiermittel mit seinen Partikeln vergleichsweise dick bzw. bildet eine vergleichsweise hohe, sich zugleich ständig austauschende Schichtdicke zwischen Kolben und Exzenter. Bei der erfindungsgemäßen Fahrzeugbremsanlagen-Kolbenpumpe ist vorteilhaft der Exzenter in einem Exzenterraum angeordnet, in dem das Schmiermittel zurückgehalten ist. Dabei ist insbesondere vorzugsweise die Fahrzeugbremsanlagen-Kolbenpumpe so ausgebildet, dass das Schmiermittel in dem Lubricant with its particles comparatively thick or forms a comparatively high, at the same time constantly changing layer thickness between piston and eccentric. In the vehicle brake system piston pump according to the invention, the eccentric is advantageously arranged in an eccentric space in which the lubricant is retained. In particular, preferably the vehicle brake system piston pump is designed such that the lubricant in the

Exzenterraum von dem Exzenter zu bewegen ist. Wie bereits erwähnt, wird mittels des Exzenters eine rotatorische Bewegung in eine translatorische Eccentric space to move from the eccentric is. As already mentioned, by means of the eccentric a rotational movement into a translatory

Bewegung des Kolbens umgesetzt. Der Exzenter läuft mit einer Welle um, wobei der Schwerpunkt des Exzenters außerhalb der Drehachse dieser Welle liegt. Um den Exzenter herum ist der Exzenterraum ausgebildet, der den Exzenter umschließt. Mit der Rotation des Exzenters wird auf diese Weise vorteilhaft das erfindungsgemäße, trockene und zugleich schüttfähige Schmiermittel umgewälzt. Der Exzenterraum dient also als Vorratsraum und zugleich als Umwälzraum für das Schmiermittel. Movement of the piston implemented. The eccentric rotates with a shaft, wherein the center of gravity of the eccentric lies outside the axis of rotation of this shaft. Around the eccentric around the eccentric space is formed, which surrounds the eccentric. With the rotation of the eccentric, the inventive, dry and at the same time pourable lubricant is advantageously circulated in this way. The eccentric space thus serves as a storage space and at the same time as a circulation space for the lubricant.

Vorzugsweise weist ferner bei der Fahrzeugbremsanlagen-Kolbenpumpe das Schmiermittel eine derartige Festigkeit auf, dass es zwischen dem Kolben und dem Exzenter verformbar ist. Als Festigkeit bezeichnet man die Eigenschaft eines Stoffes, in diesem Fall des Schmiermittels, sich unter einer Krafteinwirkung zu verformen. Die Festigkeit ist vorteilhaft also so, dass beim Bewegung von Exzenter und Kolben zwischen dem Kolben und dem Exzenter das Schmiermittel zerdrückt bzw. gequetscht wird. Die einzelnen Partikel des erfindungsgemäßen Schmiermittels werden dadurch flach gedrückt und vergrößern ihre flächige Erstreckung. Die derart vergrößerte flächige Erstreckung der einzelnen Partikel des Schmiermittels vergrößert insgesamt die Oberfläche der Schmierschicht zwischen Kolben und Exzenter. Bei einer Vielzahl Partikel wirkt dabei jedes einzelne Partikel als„fladenförmiges" Plättchen. Diese Plättchen liegen insbesondere nebeneinander und bilden derart eine Schmierschicht, mittels der der Kolben von dem Exzenter beabstandet ist. Erfindungsgemäß bevorzugt ist ferner bei der Fahrzeugbremsanlagen-Preferably, further, in the vehicle brake system piston pump, the lubricant has such a strength that it is deformable between the piston and the eccentric. Strength is the property of a substance, in this case the lubricant, to deform under a force. The strength is advantageous so that the lubricant is crushed or crushed during movement of the eccentric and piston between the piston and the eccentric. The individual particles of the lubricant according to the invention are thereby pressed flat and increase their areal extent. The thus enlarged areal extent of the individual particles of the lubricant increases overall the surface of the lubricating layer between the piston and the eccentric. In the case of a large number of particles, each individual particle acts as a "platelike" platelet, these platelets in particular lying next to one another and thus forming a lubricating layer, by means of which the piston is spaced from the eccentric.

Kolbenpumpe das Schmiermittel so ausgebildet, dass das Schmiermittel aus einer Vielzahl Partikel gebildet ist, die je Kugelform aufweisen. Die kugelige Form der einzelnen Partikel ermöglicht ein besonders leicht strömendes, vorteilhaftes Bewegen des Schmiermittels innerhalb des Exzenterraums mittels des Exzenters. Die einzelnen kugelförmigen Partikel rollen beim Bewegen der Partikel aneinander ab. Piston pump, the lubricant is formed so that the lubricant is formed of a plurality of particles, each having a spherical shape. The spherical shape of the individual particles allows a particularly easy-flowing, advantageous moving of the lubricant within the eccentric space by means of the Eccentric. The individual spherical particles roll off each other as the particles move.

Vorteilhaft ist alternativ bei der Fahrzeugbremsanlagen-Kolbenpumpe das Schmiermittel so ausgebildet, dass das Schmiermittel aus einer Vielzahl Partikel gebildet ist, die je Linsenform aufweisen. Eine Linsenform stellt eine verformte Kugel dar, bei der zwei gegenüberliegende Seiten der Kugel abgeflacht sind. In der Optik wird diese Linsenform auch als bikonvexe Linse bezeichnet. Die Linsenform hat vorliegend den Vorteil, dass die zugehörigen Partikel aufgrund der abgeflachten Form leichter zwischen den Exzenter und den Kolben rutschen.Advantageously, alternatively, in the vehicle brake system piston pump, the lubricant is formed so that the lubricant is formed from a plurality of particles, each having a lens shape. A lens mold represents a deformed sphere in which two opposite sides of the sphere are flattened. In optics, this lens shape is also referred to as a biconvex lens. In the present case, the lens shape has the advantage that the associated particles more easily slip between the eccentric and the piston due to the flattened shape.

Ein weiterer Vorteil ist, dass ein linsenförmiges Partikel sich mit den abgeflachten Seiten zwischen dem Kolben und dem Exzenter anordnet. Vorteilhaft wird die so angeordnete Linse von dem Kolben und dem Zylinder weiter zu einer Scheibe bzw. einem Fladen verformt. Another advantage is that a lenticular particle rests with the flattened sides between the piston and the eccentric. Advantageously, the lens thus arranged is further deformed by the piston and cylinder into a disk.

Vorzugsweise ist ferner bei der erfindungsgemäßen Fahrzeugbremsanlagen- Kolbenpumpe das Schmiermittel aus Polytetrafluorethylen hergestellt. Preferably, in the Fahrzeugbremsanlagen- piston pump according to the invention, the lubricant is made of polytetrafluoroethylene.

Polytetrafluorethylen, auch als PTFE bekannt, ist vorliegend vorteilhaft als trockenes Schmiermittel geeignet, da PTFE einen sehr geringen dynamischen Reibungskoeffizienten von 0,07 (in Worten: null Komma null sieben) aufweist.Polytetrafluoroethylene, also known as PTFE, is advantageously suitable herein as a dry lubricant, since PTFE has a very low dynamic coefficient of friction of 0.07 (in words: zero point zero seven).

Der Reibungskoeffizient ist nach Siebel/Kehl Spurzapfenprinzip mit V=0,65 m/s (in Worten: null Komma fünfundsechzig Meter pro Sekunde) und p=1 MPa in Worten: ein Megapascal) ermittelt. Vergleichend kann man sagen, dass PTFE ähnlich gut wie nasses Eis gleitet. Ein weiterer Vorteil von PTFE ist, dass die Haftreibung genauso groß ist wie die Gleitreibung. Ein Übergang von einemThe coefficient of friction is determined according to Siebel / Kehl's journal principle with V = 0.65 m / s (in words: zero point sixty-five meters per second) and p = 1 MPa in words: one megapascal). Comparatively, one can say that PTFE glides as well as wet ice. Another advantage of PTFE is that the static friction is just as great as the sliding friction. A transition from one

Stillstand zu einer Bewegung findet nahezu ohne Anlaufruck statt. Vorteilhaft ist ferner das mit PTFE gebildete Schmiermittel mit Zusatzstoffen, wie insbesondere Graphit, versehen. Ferner weist vorzugsweise das erfindungsgemäße Schmiermittel eine Shore-Standstill to a movement takes place almost without start-up pressure. Furthermore, the lubricant formed with PTFE is advantageously provided with additives, in particular graphite. Furthermore, the lubricant according to the invention preferably has a shore

Härte D zwischen 50 und 80 (in Worten: zwischen fünfzig und achtzig), insbesondere zwischen 55 und 70 (in Worten: zwischen fünfundfünfzig und siebzig) auf. Um die Shore-Härte D zu messen, wird mittels eines Hardness D is between 50 and 80 (in words: between fifty and eighty), especially between 55 and 70 (in words: between fifty-five and seventy). To measure the Shore D hardness is determined by means of a

federbelasteten Stahlstiftes die Eindringtiefe in das Material und somit die Härte des Materials bestimmt. Die hier angegebenen Werte beziehen sich auf eine Messung nach DIN 53 505. Der Vorteil des derartigen, erfindungsgemäßen Schmiermittels liegt darin, dass das Schmiermittel formstabil bei der Lagerung ist. Zugleich lässt sich der derartige Schmierstoff zwischen dem Kolben und dem Exzenter vorteilhaft verformen bzw. quetschen. spring-loaded steel pin determines the depth of penetration into the material and thus the hardness of the material. The values given here refer to one Measurement according to DIN 53 505. The advantage of such lubricant according to the invention is that the lubricant is dimensionally stable during storage. At the same time, such a lubricant can advantageously be deformed or squeezed between the piston and the eccentric.

Das erfindungsgemäße Schmiermittel ist also vorteilhaft als ein schüttfähiger Trockenstoff ausgebildet. Das Schmiermittel besteht vorzugsweise aus einer Vielzahl Partikel, die je Kugelform oder Linsenform aufweisen. Vorteilhaft ist das Schmiermittel aus Polytetrafluorethylen (PTFE) hergestellt. Alternativ ist das Schmiermittel aus Molybdän(IV)-sulfid oder aus Perfluoralkoxy-Polymer (PFA) hergestellt. Weitere vorteilhafte Materialien sind Polyetheretherketon (PEEK) oder eine Sonderform des Polyethylen dem ultrahochmolekularen high density Polyethylen (PE-UHMW). Der erfindungsgemäße Schmierstoff ist vorteilhaft auch als eine Gemisch unterschiedlicher Schmierstoffe ausgebildet. The lubricant according to the invention is thus advantageously designed as a pourable dry substance. The lubricant preferably consists of a plurality of particles, each having a spherical shape or lens shape. Advantageously, the lubricant is made of polytetrafluoroethylene (PTFE). Alternatively, the lubricant is made of molybdenum (IV) sulfide or perfluoroalkoxy polymer (PFA). Other advantageous materials are polyetheretherketone (PEEK) or a special form of polyethylene ultrahigh molecular weight high density polyethylene (PE-UHMW). The lubricant according to the invention is advantageously also designed as a mixture of different lubricants.

Die Erfindung ist entsprechend ferner auf eine Verwendung eines derartigen, erfindungsgemäßen Schmiermittels bei einer Fahrzeugbremsanlagen- Kolbenpumpe gerichtet. The invention is accordingly further directed to a use of such lubricant according to the invention in a vehicle brake system piston pump.

Nachfolgend werden Ausführungsbeispiele der erfindungsgemäßen Lösung anhand der beigefügten schematischen Zeichnungen näher erläutert. Es zeigt: Exemplary embodiments of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings. It shows:

Fig. 1 einen teilweisen Längsschnitt einer Fahrzeugbremsanlagen- Kolbenpumpe als Stand der Technik, 1 is a partial longitudinal section of a Fahrzeugbremsanlagen- piston pump as prior art,

Fig. 2 einen teilweisen Längsschnitt einer erfindungsgemäßen  Fig. 2 is a partial longitudinal section of an inventive

Fahrzeugbremsanlagen-Kolbenpumpe,  Vehicle brake piston pump,

Fig. 3 eine Detailansicht einer ersten Variante gemäß Fig. 2,  3 is a detail view of a first variant of FIG. 2,

Fig. 4 eine Detailansicht einer zweiten Variante gemäß Fig. 2,  4 is a detail view of a second variant of FIG. 2,

Fig. 1 zeigt einen Teil einer Fahrzeugbremsanlagen-Kolbenpumpe 10, die zum Erzeugen von hydraulischem Druck an Radbremsen eines Fahrzeugs dient. Der Druck wird mittels der Fahrzeugbremsanlagen-Kolbenpumpe 10 erzeugt, indem ein Kolben 12 sich in einen Druckraum 14 hineinbewegt und dabei eine Fig. 1 shows a portion of a vehicle brake system piston pump 10 which serves to generate hydraulic pressure on wheel brakes of a vehicle. The pressure is generated by means of the vehicle brake system piston pump 10 by a piston 12 moves into a pressure chamber 14 while a

Flüssigkeit 16 relativ zur Umgebung unter Überdruck setzt. Die Bewegung des Kolbens 12 wird mittels eines Exzenters 18 erzeugt, der in einem Exzenterraum 20 umläuft. Der Exzenter 18 ist dabei an einer drehbaren Exzenterwelle 22 ortsfest angekoppelt. Der Exzenter 18 wandelt so die Liquid 16 is pressurized relative to the environment. The movement of the piston 12 is generated by means of an eccentric 18, which rotates in an eccentric space 20. The eccentric 18 is coupled to a rotatable eccentric shaft 22 stationary. The eccentric 18 converts so the

Drehbewegung der Exzenterwelle 22 in eine translatorische Bewegung des Kolbens 12 um. Rotary movement of the eccentric shaft 22 in a translational movement of the piston 12 to.

Der Exzenter 18 ist außermittig auf der Exzenterwelle 22 gelagert, was bedeutet, dass sein Schwerepunkt 24 außerhalb der Achse 26 der Exzenterwelle 22 liegt. Bei dieser Anordnung ist innerhalb des Exzenterraums 20 zwischen dem The eccentric 18 is eccentrically mounted on the eccentric shaft 22, which means that its gravity point 24 is located outside the axis 26 of the eccentric shaft 22. In this arrangement is within the eccentric space 20 between the

Exzenter 18 und einer Innenwand 28 des Exzenterraums 20 ein Hohlraum 30 ausgebildet. Dieser Hohlraum 30 ändert während der Bewegung des Exzenters 18 an der Exzenterwelle 22 seine Form. Eccentric 18 and an inner wall 28 of the eccentric 20, a cavity 30 is formed. This cavity 30 changes during the movement of the eccentric 18 on the eccentric shaft 22 its shape.

Während der Bewegung des Exzenters 18 reibt dieser an der ihm zugewandten Stirnseite des Kolben 12. Es besteht zwischen dem Kolben 12 und dem Exzenter 18 eine Reibfläche 32. Um an dieser Reibfläche 32 eine Reibung zu minimieren, ist an der Reibfläche 32 ein zähflüssiges Schmiermittel 34 vorgesehen. During the movement of the eccentric 18, this rubs against the end face of the piston 12 facing it. There is a friction surface 32 between the piston 12 and the eccentric 18. In order to minimize friction on this friction surface 32, a viscous lubricant 34 is provided on the friction surface 32 intended.

Gemäß Fig. 1 ist das Schmiermittel 34 in herkömmlicher Weise als Schmierfett ausgebildet. Das derartige Schmierfett schmiert bei einer Bewegung des According to Fig. 1, the lubricant 34 is formed in a conventional manner as a grease. The grease lubricates during a movement of the

Exzenters 18 die Reibfläche 32 zwischen dem Kolben 12 und dem Exzenter 18 und verringert so die Reibung an der Reibfläche 32. Eccentric 18, the friction surface 32 between the piston 12 and the eccentric 18 and thus reduces the friction on the friction surface 32nd

In Fig. 2 bis 4 ist eine konstruktiv gleichartige Fahrzeugbremsanlagen- Kolbenpumpe 10 veranschaulicht, bei der in erfindungsgemäßer Weise das Schmiermittel 32 als ein schüttfähiger Trockenstoff 36 ausgebildet ist. Der Trockenstoff 36 umfasst eine Vielzahl Partikel 38, die gemäß Fig. 2 und 3 jeweils Kugelform aufweisen. Fig. 4 zeigt den Trockenstoff 36 in einer Ausführungsform, bei der die Partikel 38 jeweils Linsenform aufweisen. In Fig. 2 to 4, a structurally similar Fahrzeugbremsanlagen- piston pump 10 is illustrated, in which according to the invention, the lubricant 32 is formed as a pourable dry matter 36. The dry matter 36 comprises a multiplicity of particles 38 which, according to FIGS. 2 and 3, each have a spherical shape. FIG. 4 shows the dry matter 36 in an embodiment in which the particles 38 each have a lens shape.

Gemäß Fig. 2 bis 4 ist der Trockenstoff 36 innerhalb des Exzenterraums 20 gelagert. Der Trockenstoff 36 wird während der Bewegung des Exzenters 18 zu der Reibfläche 32 hin und dort zwischen den Kolben 12 und den Exzenter 18 gefördert. Die einzelnen Partikel 38 des Trockenstoffs 36 werden dabei zwischen dem Kolben 12 und dem Exzenter 18 zusammengedrückt. According to FIGS. 2 to 4, the dry substance 36 is mounted within the eccentric space 20. The dry matter 36 is conveyed to the friction surface 32 between the pistons 12 and the eccentric 18 during the movement of the eccentric 18. The individual particles 38 of the dry substance 36 are between the piston 12 and the eccentric 18 compressed.

Beim Zusammendrücken der einzelnen Partikel 38 werden diese abgeflacht und ihre Oberfläche vergrößert sich. Die Partikel 38 werden„fladenförmig". Die derartigen Partikel 38 legen sich dann zwischen den Kolben 12 und den ExzenterWhen the individual particles 38 are compressed, they are flattened and their surface area increases. The particles 38 become "flat-shaped." Such particles 38 then lie between the pistons 12 and the eccentric

18 und verringern an der Reibfläche 32 dauerhaft die Reibung. 18 and reduce friction on the friction surface 32 permanently.

Claims

Ansprüche claims 1. Fahrzeugbremsanlagen-Kolbenpumpe (10), bei der ein Kolben (12) mittels eines Exzenters (18) hin und her bewegbar ist, zwischen dem Kolben (12) und dem Exzenter (18) eine Reibfläche (32) ausgebildet ist und an der 1. vehicle brake system piston pump (10), in which a piston (12) by means of an eccentric (18) is movable back and forth, between the piston (12) and the eccentric (18) has a friction surface (32) is formed and on the Reibfläche (32) ein Schmiermittel (34) vorgesehen ist, Friction surface (32) a lubricant (34) is provided dadurch gekennzeichnet, dass das Schmiermittel (34) als ein schüttfähiger Trockenstoff (36) ausgebildet ist. characterized in that the lubricant (34) is designed as a pourable dry substance (36). 2. Fahrzeugbremsanlagen-Kolbenpumpe nach Anspruch 1 , 2. A vehicle brake system piston pump according to claim 1, dadurch gekennzeichnet, dass der Exzenter (18) in einem Exzenterraum (20) angeordnet ist, in dem das Schmiermittel (34) zurückgehalten ist. characterized in that the eccentric (18) is arranged in an eccentric space (20) in which the lubricant (34) is retained. 3. Fahrzeugbremsanlagen-Kolbenpumpe nach Anspruch 2, 3. vehicle brake system piston pump according to claim 2, dadurch gekennzeichnet, dass das Schmiermittel (34) in dem Exzenterraum (20) von dem Exzenter (18) zu bewegen ist. characterized in that the lubricant (34) in the eccentric space (20) is to be moved by the eccentric (18). 4. Fahrzeugbremsanlagen-Kolbenpumpe nach einem der Ansprüche 1 bis4. Vehicle brake system piston pump according to one of claims 1 to 3, 3, dadurch gekennzeichnet, dass das Schmiermittel (34) eine derartige Festigkeit aufweist, dass es zwischen dem Kolben (12) und dem Exzenter (18) verformbar ist. characterized in that the lubricant (34) has a strength such that it is deformable between the piston (12) and the eccentric (18). 5. Fahrzeugbremsanlagen-Kolbenpumpe nach einem der Ansprüche 1 bis 4, 5. A vehicle brake system piston pump according to one of claims 1 to 4, dadurch gekennzeichnet, dass das Schmiermittel (34) aus einer Vielzahl Partikel (38) gebildet ist, die je Kugelform aufweisen. characterized in that the lubricant (34) is formed from a plurality of particles (38) each having a spherical shape. 6. Fahrzeugbremsanlagen-Kolbenpumpe nach einem der Ansprüche 1 bis6. vehicle brake system piston pump according to one of claims 1 to 5, 5, dadurch gekennzeichnet, dass das Schmiermittel (34) aus einer Vielzahl Partikel (38) gebildet ist, die je Linsenform aufweisen. characterized in that the lubricant (34) is formed from a plurality of particles (38) each having a lens shape. 7. Fahrzeugbremsanlagen-Kolbenpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Schmiermittel (34) aus Polytetrafluorethylen hergestellt ist. 7. A vehicle brake system piston pump according to one of claims 1 to 6, characterized in that the lubricant (34) is made of polytetrafluoroethylene. 8. Fahrzeugbremsanlagen-Kolbenpumpe nach einem der Ansprüche 1 bis 7, 8. A vehicle brake system piston pump according to one of claims 1 to 7, dadurch gekennzeichnet, dass das Schmiermittel (34) eine Shore-Härte D zwischen 50 und 80, insbesondere zwischen 55 und 70 aufweist. characterized in that the lubricant (34) has a Shore hardness D between 50 and 80, in particular between 55 and 70. 9. Schmiermittel (34) für eine Pumpe, 9. lubricant (34) for a pump, dadurch gekennzeichnet, dass das Schmiermittel (34) als ein schüttfähigercharacterized in that the lubricant (34) as a pourable Trockenstoff (36) ausgebildet ist. Dry substance (36) is formed. 10. Verwenden eines Schmiermittels (34) nach Anspruch 9 in einem Exzenterraum (20) einer Fahrzeugbremsanlagen-Kolbenpumpe (10). 10. Use of a lubricant (34) according to claim 9 in an eccentric space (20) of a vehicle brake system piston pump (10).
PCT/EP2017/061147 2016-08-01 2017-05-10 Vehicle brake system piston pump comprising a lubricant Ceased WO2018024381A1 (en)

Priority Applications (3)

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CN201780047442.3A CN109563820A (en) 2016-08-01 2017-05-10 Vehicle brake apparatus-piston pump with lubriation material
KR1020197003047A KR20190033547A (en) 2016-08-01 2017-05-10 Vehicle brake system piston pump including lubricant
JP2019504856A JP2019525059A (en) 2016-08-01 2017-05-10 Vehicle brake device piston pump with lubrication means

Applications Claiming Priority (2)

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DE102016214127.9 2016-08-01
DE102016214127.9A DE102016214127A1 (en) 2016-08-01 2016-08-01 Vehicle brake system piston pump with a lubricant

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