DE102013200370A1 - Hydraulic damper for use in vehicle brake assembly piston pump, has inlet valve for preventing back-flow of hydraulic fluid flowed into chamber, and outlet throttle provided for throttling leaking out of hydraulic fluid from chamber - Google Patents
Hydraulic damper for use in vehicle brake assembly piston pump, has inlet valve for preventing back-flow of hydraulic fluid flowed into chamber, and outlet throttle provided for throttling leaking out of hydraulic fluid from chamber Download PDFInfo
- Publication number
- DE102013200370A1 DE102013200370A1 DE201310200370 DE102013200370A DE102013200370A1 DE 102013200370 A1 DE102013200370 A1 DE 102013200370A1 DE 201310200370 DE201310200370 DE 201310200370 DE 102013200370 A DE102013200370 A DE 102013200370A DE 102013200370 A1 DE102013200370 A1 DE 102013200370A1
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- Germany
- Prior art keywords
- chamber
- damper
- hydraulic
- hydraulic fluid
- inlet valve
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Classifications
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- 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
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- 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
-
- 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
- B60T8/4068—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 the additional fluid circuit comprising means for attenuating pressure pulsations
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- 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
-
- 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
- F04B11/0033—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a mechanical spring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Pipe Accessories (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Erfindung betrifft einen hydraulischen Dämpfer für eine Fahrzeugbremsanlagen-Kolbenpumpe mit einer Dämpferkammer zum Dämpfen von Druckpulsationen eines Hydraulikfluids. The invention relates to a hydraulic damper for a vehicle brake system piston pump with a damper chamber for damping pressure pulsations of a hydraulic fluid.
Hydraulische Dämpfer der oben genannten Art werden bei Fahrzeugbremsanlagen an der Druckseite von Kolbenpumpen in der Regel unmittelbar hinter einem Auslassventil verwendet, um Druckpulsationen, welche durch die Bewegung eines Kolbens der Kolbenpumpe bedingt sind, zu dämpfen. Es sind hydraulische Dämpfer bekannt, die ein Flüssigkeitsvolumen umfassen, wobei aber die Funktion dieser Dämpfer abhängig von der Größe des eingebrachten Volumens ist. Das erforderliche Volumen kann verhältnismäßig groß sein und dadurch die Baugröße der gesamten Fahrzeugbremsanlagen-Kolbenpumpe sowie des zugehörigen Hydroaggregats negativ beeinflussen. Bei einer anderen Art von hydraulischen Dämpfern ist eine Stahlmembrane in einem elastischen Massefederelement, beispielsweise einem Gummielement, gelagert. Beim Anlegen von zu dämpfendem Druck wird das Massefederelement inklusive der Stahlmembrane elastisch ausgelenkt. Diese Art eines hydraulischen Dämpfers baut zwar vergleichsweise klein, kann aber nur Drucke bis ca. 50 bar aufnehmen. Hydraulic dampers of the above type are used in vehicle brake systems on the pressure side of piston pumps usually immediately downstream of an exhaust valve to dampen pressure pulsations, which are caused by the movement of a piston of the piston pump. Hydraulic dampers are known which comprise a volume of fluid, but the function of these dampers is dependent on the size of the volume introduced. The required volume can be relatively large and thereby adversely affect the size of the entire vehicle brake system piston pump and the associated hydraulic unit. In another type of hydraulic damper, a steel diaphragm is mounted in an elastic mass spring element, for example a rubber element. When applying pressure to be damped, the mass spring element including the steel diaphragm is elastically deflected. Although this type of hydraulic damper builds relatively small, but can only record pressures up to 50 bar.
Offenbarung der ErfindungDisclosure of the invention
Erfindungsgemäß ist ein hydraulischer Dämpfer für eine Fahrzeugbremsanlagen-Kolbenpumpe mit einer Dämpferkammer zum Dämpfen von Druckpulsationen eines Hydraulikfluids geschaffen, bei dem an der Dämpferkammer ein Einlassventil zum Verhindern eines Zurückströmens von in die Dämpferkammer eingeströmtem Hydraulikfluid und eine Auslassdrossel zum Drosseln eines Ausströmens von aus der Dämpferkammer ausströmendem Hydraulikfluid vorgesehen sind. According to the invention, there is provided a hydraulic damper for a vehicle brake system piston pump having a damper chamber for damping pressure pulsations of a hydraulic fluid, to which damper chamber an inlet valve for preventing backflow of hydraulic fluid that has flowed into the damper chamber and an outlet damper for throttling outflow out of the damper chamber Hydraulic fluid are provided.
Mit dem erfindungsgemäßen Dämpfer ist es möglich, Druckpulsationen von Hydraulikfluid, welches von einer Kolbenpumpe gepumpt wird, über den gesamten relevanten Betriebstemperaturbereich von –40° C bis +80° C erheblich zu reduzieren. Der Dämpfer verhält sich aufgrund des darin mittels des Einlassventils zurückgehaltenen Hydraulikfluids bei gleichzeitig gezielter Abströmung durch eine Auslassdrossel hindurch im gesamten Temperaturbereich hochdynamisch. Dabei wird als Federelement in der erfindungsgemäßen Dämpferkammer besonders bevorzugt ein gegen das einströmende Hydraulikfluid federnd vorgespannter Kolben genutzt. Die erfindungsgemäße Auslassdrossel wirkt zusammen mit einem solchen Kolben ideal zusammen, um sich gerade bei Abweichungen im Förderverhalten, wie Drucküberhöhungen bei Tieftemperatur oder einen höheren Volumenstrom bei Hochtemperatur, angepasst federnd nachstellen zu können. Mit der derartigen Stellfunktion wird im Abströmbereich der Kolbenpumpe besonders bei hochviskoser Flüssigkeit oder einem hohen Volumenstrom die Ausschubpulsation der zugehörigen Kolbenpumpe reduziert. Mit dem derartigen dynamischen Dämpfer reduziert sich damit die erforderliche Antriebsleistung für die Kolbenpumpe. Ferner sinkt die Belastung auf deren kraftübertragende Einzelteile, wie Lager, Kolben und Hochdruckdichtring. With the damper according to the invention, it is possible to significantly reduce pressure pulsations of hydraulic fluid which is pumped by a piston pump over the entire relevant operating temperature range of -40 ° C to + 80 ° C. Due to the hydraulic fluid retained therein by means of the inlet valve, the damper behaves highly dynamically at the same time as a targeted outflow through an outlet throttle over the entire temperature range. In this case, a piston which is spring-biased against the inflowing hydraulic fluid is particularly preferably used as the spring element in the damper chamber according to the invention. The exhaust throttle according to the invention cooperates ideally with such a piston, so that it can be adjusted in a spring-like manner precisely in the event of deviations in the conveying behavior, such as pressure peaks at low temperature or a higher volume flow at high temperature. With the actuating function of this type, the ejection pulsation of the associated piston pump is reduced in the outflow region of the piston pump, particularly in the case of highly viscous fluid or a high volume flow. With such a dynamic damper thus reduces the required drive power for the piston pump. Furthermore, the load on their force-transmitting items, such as bearings, pistons and high-pressure seal decreases.
Bei einer vorteilhaften Weiterbildung dieses erfindungsgemäßen hydraulischen Dämpfers ist das Einlassventil als ein federloses Ventil gestaltet. Das derart federlose Ventil weist ein besonders reaktionsschnelles Verhalten auf. Es kann daher als so genanntes Flatterventil von dem sich in der Dämpferkammer in Strömungsrichtung vor bzw. stromauf von der erfindungsgemäßen Auslassdrossel kurzfristig aufbauenden Pulsationsdruck sehr schnell geschlossen werden. In an advantageous development of this hydraulic damper according to the invention, the inlet valve is designed as a springless valve. The springless valve has a particularly responsive behavior. It can therefore be closed very quickly as a so-called flutter valve of which in the damper chamber in the flow direction before or upstream of the exhaust throttle according to the invention short-term building up pulsation.
Vorzugsweise ist ferner bei dem hydraulischen Dämpfer gemäß der Erfindung das Einlassventil als ein Plattenventil gestaltet. Die dabei plattenförmige bzw. scheibenförmige Gestalt des zum Einlassventil gehörenden Ventilschließkörpers, der auch als ein Hut bezeichnet werden könnte, schafft für den, das Einlassventil schließenden Fluidstrom eine große Druckangriffsfläche. Preferably, furthermore, in the hydraulic damper according to the invention, the inlet valve is designed as a plate valve. The plate-shaped or disk-shaped shape of the inlet valve-associated valve closing body, which could also be referred to as a hat, creates a large pressure application area for the fluid flow closing the inlet valve.
Das Einlassventil und das Auslassventil des erfindungsgemäßen hydraulischen Dämpfers sind bevorzugt als eine Baueinheit an einer gemeinsamen Stützscheibe angeordnet. Vorzugsweise sind die beiden Bauteile dabei konzentrisch an der Stützscheibe angeordnet, besonders bevorzugt zentrisch an der dabei kreisförmigen Stützscheibe. Die derartige Anordnung vereinfacht insbesondere die Montage des erfindungsgemäßen Dämpfers. The inlet valve and the outlet valve of the hydraulic damper according to the invention are preferably arranged as a structural unit on a common support disk. In this case, the two components are preferably arranged concentrically on the support disk, more preferably centrically on the circular support disk. Such an arrangement simplifies in particular the assembly of the damper according to the invention.
Die Stützscheibe ist vorzugsweise mit einer Sicke versteift. Die Sicke ist vorteilhaft mittels eines Stanz- oder Prägevorgangs kostengünstig herzustellen. Sie ist dabei insbesondere kreisförmig und zentrisch an der dann ebenfalls kreisförmigen Stützscheibe angeordnet. The support disk is preferably stiffened with a bead. The bead is advantageous to produce inexpensively by means of a stamping or stamping process. It is in particular circular and centric arranged on the then also circular support disk.
Mit der Sicke ist vorzugsweise zugleich ein Abstandshalter für einen zugehörigen Dämpferkolben gebildet. Dabei kann mittels einer einfachen Auswölbung des Materials der Sicke an der zum Dämpferkolben gewandten Stirnseite der Stützscheibe eine punktförmige oder stegförmige Erhöhung geschaffen sein, welche verhindert, dass es zwischen einer, der Stützscheibe zugewandten Stirnseite des Dämpferkolbens und der Stützscheibe selbst zu einem Ankleben bzw. Anhaften kommen könnte. With the bead is preferably formed at the same time a spacer for an associated damper piston. It can be created by means of a simple bulge of the material of the bead on the damper piston facing the end face of the support disk, a punctiform or web-shaped elevation, which prevents it between a, the support disk facing end of Damper piston and the support disk itself could come to sticking or sticking.
Die Stützscheibe ist ferner bevorzugt einteilig mit einer Hülse verbunden, in der insbesondere ein zugehöriger Dämpferkolben geführt ist. Die derartige Hülse kann auf kostengünstige Weise eine präzise Kolbenlauffläche bereitstellen und zugleich Stütz- und Haltefunktionen für die Bauteile Einlassventil und Auslassdrossel übernehmen. The support disk is also preferably integrally connected to a sleeve in which in particular an associated damper piston is guided. The sleeve of this kind can provide a precise piston running surface in a cost-effective manner and at the same time take over supporting and holding functions for the components inlet valve and outlet throttle.
Darüber hinaus ist vorzugsweise an bzw. in der Stützscheibe ein Dichtwulst ausgebildet. Der Dichtwulst ist insbesondere durch eine axiale Auslenkung der Stützscheibe gegen einen benachbarten Gehäuseboden gedrängt. Mit dem Anpressen gegen den Gehäuseboden kann eine aus dem zugehörigen Gehäuse in die Dämpferkammer führende Leitungsverbindung, die sich durch den Dichtwulst hindurch erstreckt, abgedichtet werden. Vorzugsweise ist der Dichtwulst dabei zentrisch bzw. in der Mitte der Stützscheibe angeordnet, so dass mit diesem auf den Dichtwulst eine am gesamten Umfang gleichmäßige Anpressung ausgeübt wird. Der Dichtwulst wird besonders bevorzugt mittels eines kostengünstigen Crimpvorgangs hergestellt. In addition, a sealing bead is preferably formed on or in the support disk. The sealing bead is urged in particular by an axial deflection of the support disk against an adjacent housing bottom. By pressing against the housing bottom, a line connection leading from the associated housing into the damper chamber, which extends through the sealing bead, can be sealed. Preferably, the sealing bead is arranged centrally or in the middle of the support disk, so that with this on the sealing bead over the entire circumference uniform contact pressure is exerted. The sealing bead is particularly preferably produced by means of a cost-effective crimping process.
Die Auslassdrossel des erfindungsgemäßen hydraulischen Dämpfers ist vorzugsweise mit einer Drosselscheibe, insbesondere einer ringförmigen Drosselscheibe gestaltet. Die Drosselscheibe ist insbesondere an der Stützscheibe ebenfalls mit einem Crimpvorgang eingefasst und auf diese Weise dort formschlüssig gehaltert. The outlet throttle of the hydraulic damper according to the invention is preferably designed with a throttle disk, in particular an annular throttle disk. The throttle disk is also bordered in particular on the support disk with a crimping process and in this way is held there in a form-fitting manner.
Die Erfindung ist auch auf eine Verwendung eines derartigen erfindungsgemäßen hydraulischen Dämpfers zum Dämpfen von Druckpulsationen einer Fahrzeugbremsanlagen-Kolbenpumpe gerichtet. Bei einer solchen Fahrzeugbremsanlagen-Kolbenpumpe können die oben genannten Vorteile besonders herausgearbeitet und genutzt werden. The invention is also directed to a use of such a hydraulic damper according to the invention for damping pressure pulsations of a vehicle brake system piston pump. In such a vehicle brake system piston pump, the advantages mentioned above can be specially worked out and used.
Nachfolgend wird ein Ausführungsbeispiel der erfindungsgemäßen Lösung anhand der beigefügten schematischen Zeichnungen näher erläutert. Es zeigt: An exemplary embodiment of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings. It shows:
In
In
In der Dämpferkammer
In der Hülse
An der Stützscheibe
Das sich dann in der Dämpferkammer
Die Drosselscheibe
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE201310200370 DE102013200370A1 (en) | 2013-01-14 | 2013-01-14 | Hydraulic damper for use in vehicle brake assembly piston pump, has inlet valve for preventing back-flow of hydraulic fluid flowed into chamber, and outlet throttle provided for throttling leaking out of hydraulic fluid from chamber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201310200370 DE102013200370A1 (en) | 2013-01-14 | 2013-01-14 | Hydraulic damper for use in vehicle brake assembly piston pump, has inlet valve for preventing back-flow of hydraulic fluid flowed into chamber, and outlet throttle provided for throttling leaking out of hydraulic fluid from chamber |
Publications (1)
Publication Number | Publication Date |
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DE102013200370A1 true DE102013200370A1 (en) | 2014-07-17 |
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DE201310200370 Pending DE102013200370A1 (en) | 2013-01-14 | 2013-01-14 | Hydraulic damper for use in vehicle brake assembly piston pump, has inlet valve for preventing back-flow of hydraulic fluid flowed into chamber, and outlet throttle provided for throttling leaking out of hydraulic fluid from chamber |
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DE (1) | DE102013200370A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160102657A1 (en) * | 2014-10-08 | 2016-04-14 | Robert Bosch Gmbh | Piston Pump for a Hydraulic Vehicle Brake System |
WO2022118112A1 (en) * | 2020-12-01 | 2022-06-09 | □ベルト・ボッシュ・ゲゼルシャフト・ミト・べシュレンクテル・ハフツング | Pump device |
JP7476350B2 (en) | 2020-12-01 | 2024-04-30 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Pumping equipment |
-
2013
- 2013-01-14 DE DE201310200370 patent/DE102013200370A1/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160102657A1 (en) * | 2014-10-08 | 2016-04-14 | Robert Bosch Gmbh | Piston Pump for a Hydraulic Vehicle Brake System |
US10648466B2 (en) * | 2014-10-08 | 2020-05-12 | Robert Bosch Gmbh | Piston pump for a hydraulic vehicle brake system |
WO2022118112A1 (en) * | 2020-12-01 | 2022-06-09 | □ベルト・ボッシュ・ゲゼルシャフト・ミト・べシュレンクテル・ハフツング | Pump device |
JP7476349B2 (en) | 2020-12-01 | 2024-04-30 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Pumping equipment |
JP7476350B2 (en) | 2020-12-01 | 2024-04-30 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Pumping equipment |
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