EP2908011A1 - Motor vehicle vacuum pump - Google Patents

Motor vehicle vacuum pump Download PDF

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Publication number
EP2908011A1
EP2908011A1 EP14155617.5A EP14155617A EP2908011A1 EP 2908011 A1 EP2908011 A1 EP 2908011A1 EP 14155617 A EP14155617 A EP 14155617A EP 2908011 A1 EP2908011 A1 EP 2908011A1
Authority
EP
European Patent Office
Prior art keywords
valve
vacuum pump
motor vehicle
outlet
microgrooves
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.)
Granted
Application number
EP14155617.5A
Other languages
German (de)
French (fr)
Other versions
EP2908011B1 (en
Inventor
Enver Des
Moritz Johannes Job
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.)
Pierburg Pump Technology GmbH
Original Assignee
Pierburg Pump Technology 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 Pierburg Pump Technology GmbH filed Critical Pierburg Pump Technology GmbH
Priority to EP14155617.5A priority Critical patent/EP2908011B1/en
Priority to JP2016547523A priority patent/JP6490699B2/en
Priority to PCT/EP2015/052090 priority patent/WO2015124415A1/en
Priority to CN201580008803.4A priority patent/CN106030114B/en
Priority to US15/115,694 priority patent/US11047391B2/en
Publication of EP2908011A1 publication Critical patent/EP2908011A1/en
Application granted granted Critical
Publication of EP2908011B1 publication Critical patent/EP2908011B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/10—Stators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/13—Noise

Definitions

  • the invention relates to a motor vehicle vacuum pump, which is designed as a positive displacement pump, for example as a vane pump.
  • the motor vehicle vacuum pump is an accessory in a motor vehicle, which is for example driven directly by an internal combustion engine or by a separate electric drive motor.
  • the motor vehicle vacuum pump has a pumping space in which a pump rotor rotates, which compresses a gas, usually air, within the pump space and pushes it out of the pump space into an outlet space through an outlet valve.
  • the outlet valve prevents backflow of compressed gas from the outlet space into the pumping space.
  • a leaf spring valve is often used because of its simple construction and high reliability, in which the valve body is formed as a leaf spring which rests in the closed position on a valve seat surrounding the valve opening and lifts at sufficient pressure difference from the valve seat, so that the exhaust valve opens becomes.
  • Problematic or at least undesirable in vacuum pumps with exhaust valves is the noise that results essentially from the high accelerations of the valve body, the lubricant in a lubricated vacuum pump and the sudden compression or decompression of the gas.
  • a mechanical automotive vacuum pump in which a channel or opening is provided for the purpose of noise reduction in the vicinity of the exhaust valve to gradually reduce the pressure changes in this area.
  • Object of the invention was in contrast to provide a motor vehicle vacuum pump with reduced noise.
  • the valve seat and / or the corresponding part of the valve body closing body on several microns which are oriented in a star-like manner in the lateral direction, so are arranged approximately radially, for example, circular valve opening.
  • the microgrooves in this way produce drainage in the closing plane of the outlet valve, via which a faster pressure equalization takes place in the interface between the valve seat and the corresponding part of the closing body when the outlet valve is opened.
  • the dissolving force for overcoming the adhesion force caused by the lubricant between the valve seat and the corresponding edge region of the closing body is thereby considerably reduced.
  • the opening movement of the closing body is harmonious, so that the noise during opening is reduced.
  • the Closing movement is thereby harmonious, so that the noise is reduced when closing the exhaust valve.
  • the groove depth t of the microgrooves is smaller than 0.2 mm, and more preferably smaller than 0.1 mm.
  • the groove width of the microgrooves is less than 0.5 mm, and is particularly preferably less than 0.25 mm.
  • the ratio of the length I of the microgrooves to their mutual lateral distance d is greater than 1.0.
  • the distance between two micro-grooves is usually smaller than the length of the micro-grooves.
  • the microgrooves do not intersect, but are arranged in a star-like manner. In rectilinear regions of the valve seat, the microgrooves are preferably arranged parallel to one another.
  • the microgrooves are provided either only on the valve seat or only on the closing body.
  • the microgrooves are provided only on the valve seat which surrounds the valve opening.
  • the positive effects on the noise emissions can not be significantly improved by providing the microgrooves on both the valve seat and the valve body closing body, so that by providing the micro grooves only one side of the interface, the manufacturing cost can be kept relatively low without functional disadvantage.
  • one longitudinal end of the microgrooves is toward the valve opening and the other longitudinal end of the microgrooves is open toward the outlet space.
  • valve seat is raised. This simple measure can in particular ensure that the microgrooves are always open on the outside at their outer longitudinal end to the outlet space.
  • the microgrooves are made by laser engraving or by embossing. In this way, the opening and closing behavior of the exhaust valve can be significantly improved with a relatively simple process.
  • the valve body is designed as a leaf spring. Such a design of the valve body is inexpensive and mechanically reliable.
  • FIG. 1 an open automotive vacuum pump 10 is shown, in which a partition wall 22 is visible, which separates a pumping space 12 from an outlet space 14, as in the cross-sectional view of FIG. 5 shown.
  • the vacuum pump 10 is a so-called mechanical vacuum pump, which is mechanically driven by an internal combustion engine, that rotates with a speed proportional to the speed of the internal combustion engine.
  • the vacuum pump 10 is driven in the installed state directly via the camshaft of the engine.
  • the vacuum pump 10 is designed as a compacting pump, and compresses discontinuously gas, in particular air.
  • an outlet valve 20 is provided on the partition 22, which opens at a corresponding overpressure in the pump chamber 12 and at non-overpressure in the pump chamber 12, a return flow of the Gas from the outlet chamber 14 back into the pump chamber 12 prevented.
  • the outlet valve 20 is In FIG. 5 represented together with the partition wall 22 in cross section.
  • the outlet valve 20 is designed as a so-called spring leaf valve.
  • a longitudinally oval-curved valve opening 24 is provided in the partition 22 .
  • a valve body 40, 40 ' is fixed, which in a first embodiment in the FIG. 3 and in a second embodiment in the FIG. 4 is shown in detail in plan view of his pump room side side.
  • the valve body 40, 40 ' has three sections in the longitudinal extent, namely the closing body section 43, 43', the hinge section 44 and the fastening section 46.
  • the valve body 40; 40 ' consists of spring plate and has in its joint portion 44 a taper 45, whereby the valve body 40; 40 'is formed in this section 44 easier bendable than in the adjacent sections 46,43.
  • the valve body 40, 40 ' has a mounting opening 48 and a recess 52.
  • the valve body 40 is fixed with a fastening means 50 in an example provided with a threaded bore 28 of the partition 22.
  • the fastener 50 may be a screw, a rivet, or other suitable fastener.
  • the recess 52 engages around a raised retaining lug 24 of the partition wall 22, so that the valve body 40 is fixed by the fastening means 50 and the retaining lug 24 clearly and non-rotatably on the partition wall 22.
  • the partition wall 22 has a joint depression 26.
  • valve body 40 At the other longitudinal end of the valve body 40; 40 'is a closing body 42,42' arranged in his in the FIG. 5 shown closed position completely closes the valve opening 24.
  • the partition wall 22 On the outlet-side 23, the partition wall 22 has a valve seat 30 which is raised in relation to the partition wall ground plane and has a planar design, onto which the corresponding strip-like edge region of the valve seat 30 extends FIGS. 3 and 4 shown pumping chamber side of the closing body rests in the closed position 42.
  • the web-like valve seat 30 has a raised height with respect to the neighboring areas of about 1 mm.
  • the valve seat 30 to 50 micro grooves 32 which are oriented in the lateral direction, ie star-like run from the inside to the outside and do not intersect.
  • the microgrooves 32 are oriented approximately perpendicular to the opening edge.
  • the microgrooves 32 have been laser engraved into the valve seat 30.
  • the microgrooves 32 typically have a groove depth t of 0.025 mm and a groove width b of 0.1 mm.
  • the length I of the microgrooves 32 may be 1.0 to 2.0 mm, the lateral distance d of two adjacent microgrooves to each other is less than 1.0 mm. In any case, the mean lateral distance d is always smaller than the length I of the microgrooves 32.
  • valve body 40 has on its side facing the valve seat 30 microgrooves 32' having the same dimensions and orientations as the microgrooves 32 in the valve seat 30.
  • the valve body 40 'having microgrooves 32' may be combined with a valve seat without micro grooves, or with a valve seat 30 according to the Figures 2 and 5 with micro grooves 32.
  • the microgrooves 32 on the valve seat 30 are open at their two longitudinal ends, so that the outer longitudinal ends open towards the outlet space and the inner longitudinal ends are open towards the pumping space. In this way, at both longitudinal ends, a fluid flow into the respective micro grooves can flow in or out, so that a corresponding pressure equalization in the micro groove is always possible. A drainage of the valve seat 30 is ensured in all operating states of the exhaust valve 20.
  • the vacuum pump 10 is preferably lubricated with oil, so that, in particular, oil is allowed to flow through the microgrooves 32 during an opening and a closing operation. 32 'flows in and out.
  • the valve body 40; 40 ' is biased so that it opens at a differential pressure of about 0.04 bar.
  • the oil can already flow in the direction of the opening center at the aforementioned differential pressure, so that the oil film between the valve seat 30 and the closing body 42; 43 'quickly breaks off.
  • a harmonic opening movement of the valve body 40 is made possible, so that the noise emissions are significantly reduced. This also applies analogously to the closing movement.

Abstract

Die Erfindung bezieht sich auf eine Kraftfahrzeug- Vakuumpumpe (10) mit einem Pumpraum (12), in dem ein Pumpenrotor verdichtend rotiert, einem Auslassraum (14), in den das verdichtete Gas aus dem Pumpraum (12) austritt, einer Trennwand (22), die den Pumpraum (12) von dem Auslassraum (14) abtrennt, und einem als Rückschlagventil ausgebildeten uslassventil (20) in der Trennwand (22), durch das das komprimierte Gas aus dem Pumpraum (12) in den Auslassraum (14) austritt. Das Auslassventil (20) wird von einer Ventilöffnung (24) in der Trennwand (22) und einem Ventilkörper (40) mit einem Schließkörper (42) gebildet. Auf der Austrittsseite der Trennwand (22) ist um die Ventilöffnung (24) herum ein Ventilsitz (30) vorgesehen, auf den der korrespondierende Teil des Schießkörpers (42) des Ventilkörpers (40) in seiner Schließstellung aufliegt. Der Ventilsitz (30) und/oder der korrespondierende Teil des Schließkörpers (42) weist mehrere Mikronuten (32) auf, die in lateraler Richtung orientiert sind.The invention relates to a motor vehicle vacuum pump (10) having a pump chamber (12) in which a pump rotor rotates in compression, an outlet chamber (14) into which the compressed gas exits from the pump chamber (12), a partition wall (22). separating the pumping space (12) from the outlet space (14) and an outlet valve (20) in the partition wall (22) designed as a check valve, through which the compressed gas exits the pumping space (12) into the outlet space (14). The outlet valve (20) is formed by a valve opening (24) in the partition (22) and a valve body (40) with a closing body (42). On the outlet side of the partition wall (22) around the valve opening (24) around a valve seat (30) is provided, on which rests the corresponding part of the shooting body (42) of the valve body (40) in its closed position. The valve seat (30) and / or the corresponding part of the closing body (42) has a plurality of micro-grooves (32) which are oriented in the lateral direction.

Description

Die Erfindung bezieht sich auf eine Kraftfahrzeug-Vakuumpumpe, die als Verdrängerpumpe ausgebildet ist, beispielsweise als Flügelzellenpumpe. Die Kraftfahrzeug-Vakuumpumpe ist ein Nebenaggregat in einem Kraftfahrzeug, das beispielsweise unmittelbar durch einen Verbrennungsmotor oder aber durch einen separaten elektrischen Antriebsmotor angetrieben wird.The invention relates to a motor vehicle vacuum pump, which is designed as a positive displacement pump, for example as a vane pump. The motor vehicle vacuum pump is an accessory in a motor vehicle, which is for example driven directly by an internal combustion engine or by a separate electric drive motor.

Die Kraftfahrzeug-Vakuumpumpe weist einen Pumpraum auf, in dem ein Pumpenrotor rotiert, der ein Gas, in der Regel Luft, innerhalb des Pumpraums komprimiert und durch ein Auslassventil aus dem Pumpraum in einen Auslassraum ausschiebt. Das Auslassventil verhindert einen Rückfluss von komprimiertem Gas aus den Auslassraum in den Pumpraum. Als Auslassventil wird wegen seiner einfachen Konstruktion und hohen Zuverlässigkeit häufig ein Blattfeder-Ventil eingesetzt, bei dem der Ventilkörper als Blattfeder ausgebildet ist, der in Schließstellung auf einem die Ventilöffnung umgebenden Ventilsitz aufliegt und bei ausreichender Druckdifferenz von dem Ventilsitz abhebt, so dass das Auslassventil geöffnet wird. Problematisch oder jedenfalls unerwünscht bei Vakuumpumpen mit Auslassventilen ist die Geräuschentwicklung, die im Wesentlichen aus den hohen Beschleunigungen des Ventilkörpers, des Schmiermittels bei einer geschmierten Vakuumpumpe und der plötzlichen Kompression oder Dekompression des Gases resultiert.The motor vehicle vacuum pump has a pumping space in which a pump rotor rotates, which compresses a gas, usually air, within the pump space and pushes it out of the pump space into an outlet space through an outlet valve. The outlet valve prevents backflow of compressed gas from the outlet space into the pumping space. As an outlet valve, a leaf spring valve is often used because of its simple construction and high reliability, in which the valve body is formed as a leaf spring which rests in the closed position on a valve seat surrounding the valve opening and lifts at sufficient pressure difference from the valve seat, so that the exhaust valve opens becomes. Problematic or at least undesirable in vacuum pumps with exhaust valves is the noise that results essentially from the high accelerations of the valve body, the lubricant in a lubricated vacuum pump and the sudden compression or decompression of the gas.

Aus DE 102 27 772 A1 ist eine mechanische Kraftfahrzeug-Vakuumpumpe bekannt, bei der zum Zwecke der Lärmverringerung in der Nähe des Auslassventils ein Kanal oder einer Öffnung vorgesehen ist, um die Druckänderungen in diesen Bereich graduell zu verringern.Out DE 102 27 772 A1 For example, a mechanical automotive vacuum pump is known in which a channel or opening is provided for the purpose of noise reduction in the vicinity of the exhaust valve to gradually reduce the pressure changes in this area.

Aus EP 1 953 389 A2 ist eine mechanische Kraftfahrzeug-Vakuumpumpe bekannt, bei der zum Zwecke der Lärmverringerung in dem als Blattfeder ausgebildeten Ventilkörper eine Öffnung vorgesehen ist, um die Druckänderungen in diesen Bereich graduell zu verringern. Zwar bewirkt diese Maßnahme eine spürbare Lärmverringerung, jedoch sind das Öffnungsverhalten und die Geräuschentwicklung beim Öffnen des Auslassventils insbesondere bei hohen Drehzahlen der Vakuumpumpe nicht immer befriedigend.Out EP 1 953 389 A2 For example, there is known a mechanical automotive vacuum pump in which an opening is provided for the purpose of noise reduction in the valve body formed as a leaf spring, to gradually reduce the pressure changes in this area. Although this measure causes a noticeable reduction in noise, but the opening behavior and noise when opening the exhaust valve, especially at high speeds of the vacuum pump are not always satisfactory.

Aufgabe der Erfindung war es demgegenüber, eine Kraftfahrzeug-Vakuumpumpe mit verringerter Geräuschentwicklung zu schaffen.Object of the invention was in contrast to provide a motor vehicle vacuum pump with reduced noise.

Diese Aufgabe wird erfindungsgemäß durch eine Kraftfahrzeug-Vakuumpumpe mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a motor vehicle vacuum pump with the features of claim 1.

Erfindungsgemäß weist der Ventilsitz und/oder der korrespondierende Teil des Ventilkörper- Schließkörpers mehrere Mikronuten auf, die quasi sternartig in lateraler Richtung orientiert sind, also bei beispielsweise kreisförmiger Ventilöffnung ungefähr radial angeordnet sind. Die Mikronuten stellen auf diese Weise in der Schließebene des Auslassventils eine Drainage her, über die in der Grenzfläche zwischen dem Ventilsitz und dem korrespondierenden Teil des Schließkörpers beim Öffnen des Auslassventils ein schnellerer Druckausgleich erfolgt. Bei einer ölgeschmierten Vakuumpumpe wird hierdurch insbesondere die Lösungskraft zum Überwinden der durch das Schmiermittel verursachten Adhäsionskraft zwischen dem Ventilsitz und dem korrespondierenden Randbereich des Schließkörpers erheblich verringert. Hierdurch wird die Öffnungsbewegung des Schließkörpers harmonischer, so dass auch die Geräuschentwicklung beim Öffnen verringert wird. Auch die Schließbewegung wird hierdurch harmonischer, so dass auch die Geräuschentwicklung beim Schließen des Auslassventils verringert ist.According to the invention, the valve seat and / or the corresponding part of the valve body closing body on several microns, which are oriented in a star-like manner in the lateral direction, so are arranged approximately radially, for example, circular valve opening. The microgrooves in this way produce drainage in the closing plane of the outlet valve, via which a faster pressure equalization takes place in the interface between the valve seat and the corresponding part of the closing body when the outlet valve is opened. In the case of an oil-lubricated vacuum pump, in particular the dissolving force for overcoming the adhesion force caused by the lubricant between the valve seat and the corresponding edge region of the closing body is thereby considerably reduced. As a result, the opening movement of the closing body is harmonious, so that the noise during opening is reduced. Also the Closing movement is thereby harmonious, so that the noise is reduced when closing the exhaust valve.

Vorzugsweise ist die Nuttiefe t der Mikronuten kleiner als 0,2 mm, und ist besonders bevorzugt kleiner als 0,1 mm. Gemäß einer bevorzugten Ausführungsform ist die Nutbreite der Mikronuten geringer als 0,5 mm, und ist besonders bevorzugt geringer als 0,25 mm. Versuche haben ergeben, dass bereits relativ wenige Mikronuten, beispielsweise weniger als 100 Mikronuten insgesamt, eine erhebliche Verringerung der Geräuschemissionen bewirken. Dadurch, dass die Mikronuten sowohl für sich alleine als auch in der Summe einen relativ kleinen Öffnungsquerschnitt aufweisen, sind die Rückströmungsverluste durch die Mikronuten vernachlässigbar.Preferably, the groove depth t of the microgrooves is smaller than 0.2 mm, and more preferably smaller than 0.1 mm. According to a preferred embodiment, the groove width of the microgrooves is less than 0.5 mm, and is particularly preferably less than 0.25 mm. Experiments have shown that already relatively few micro-grooves, for example, less than 100 microns total, cause a significant reduction in noise emissions. Due to the fact that the microgrooves have a relatively small opening cross-section both on their own and in their entirety, the backflow losses due to the microgrooves are negligible.

Vorzugsweise ist über mindestens die Hälfte des Ventilsitzes das Verhältnis der Länge I der Mikronuten zu ihrem gegenseitigen seitlichen Abstand d größer als 1,0. Mit anderen Worten, der Abstand zweier Mikronuten zueinander ist in der Regel geringer als die Länge der Mikronuten. Gemäß einer besonders bevorzugten Ausführungsform kreuzen sich die Mikronuten nicht, sondern sind sternartig angeordnet. In geradlinigen Bereichen des Ventilsitzes sind die Mikronuten bevorzugt parallel zueinander angeordnet.Preferably, over at least half of the valve seat, the ratio of the length I of the microgrooves to their mutual lateral distance d is greater than 1.0. In other words, the distance between two micro-grooves is usually smaller than the length of the micro-grooves. According to a particularly preferred embodiment, the microgrooves do not intersect, but are arranged in a star-like manner. In rectilinear regions of the valve seat, the microgrooves are preferably arranged parallel to one another.

Vorzugsweise sind die Mikronuten entweder nur an dem Ventilsitz oder nur an dem Schließkörper vorgesehen. Besonders bevorzugt sind die Mikronuten nur an dem Ventilsitz vorgesehen, der die Ventilöffnung umgibt. Tatsächlich können die positiven Effekte bezüglich der Geräuschemissionen durch ein Vorsehen der Mikronuten sowohl an dem Ventilsitz als auch an dem Schließkörper des Ventilkörpers nicht wesentlich verbessert werden, so dass durch das Vorsehen der Mikronuten an nur einer Seite der Grenzfläche die Herstellungskosten ohne funktionellen Nachteil relativ gering gehalten werden können.Preferably, the microgrooves are provided either only on the valve seat or only on the closing body. Particularly preferably, the microgrooves are provided only on the valve seat which surrounds the valve opening. In fact, the positive effects on the noise emissions can not be significantly improved by providing the microgrooves on both the valve seat and the valve body closing body, so that by providing the micro grooves only one side of the interface, the manufacturing cost can be kept relatively low without functional disadvantage.

Vorzugsweise ist bei geschlossenem Auslassventil ein Längsende der Mikronuten jeweils zur Ventilöffnung hin und ist das andere Längsende der Mikronuten jeweils zum Auslassraum hin geöffnet. Auch bei vollständig geschlossenem Auslassventil, also wenn der Schließkörper vollständig auf dem Ventilsitz aufliegt, sind die beiden Längsenden der Mikronuten offen, so dass auch bei vollständig geschlossenem Auslassventil die maximal mögliche Drainagefunktion in Nutlängsrichtung zur Verfügung steht.Preferably, with the outlet valve closed, one longitudinal end of the microgrooves is toward the valve opening and the other longitudinal end of the microgrooves is open toward the outlet space. Even when the exhaust valve is completely closed, that is, when the closing body rests completely on the valve seat, the two longitudinal ends of the micro grooves are open, so that the maximum possible drainage function is available in the groove longitudinal direction even when the exhaust valve is completely closed.

Gemäß einer bevorzugten Ausführungsform ist der Ventilsitz erhaben ausgebildet. Durch diese einfache Maßnahme kann insbesondere sichergestellt werden, dass die Mikronuten außenseitig an ihrem äußeren Längsende stets zum Auslassraum hin geöffnet sind.According to a preferred embodiment, the valve seat is raised. This simple measure can in particular ensure that the microgrooves are always open on the outside at their outer longitudinal end to the outlet space.

Vorzugsweise sind die Mikronuten durch Lasergravur oder durch Prägen hergestellt. Auf diese Weise kann mit einem relativ einfachen Verfahren das Öffnungs- und Schließverhalten des Auslassventils erheblich verbessert werden.Preferably, the microgrooves are made by laser engraving or by embossing. In this way, the opening and closing behavior of the exhaust valve can be significantly improved with a relatively simple process.

Gemäß einer bevorzugten Ausführungsform ist der Ventilkörper als Blattfeder ausgebildet. Eine derartige Konzeption des Ventilkörpers ist preiswert und mechanisch zuverlässig.According to a preferred embodiment, the valve body is designed as a leaf spring. Such a design of the valve body is inexpensive and mechanically reliable.

Im Folgenden werden unter Bezugnahme auf die Zeichnungen zwei Ausführungsbeispiele der Erfindung näher erläutert. Es zeigen:

  • Figur 1 eine geöffnete Kraftfahrzeug-Vakuumpumpe mit Blick auf die den Pumpraum von dem Auslassraum trennende Trennwand, in der ein Auslassventil vorgesehen ist,
  • Figur 2 eine Draufsicht auf die Trennwand einschließlich des Ventilsitzes im Bereich des Auslassventils,
  • Figur 3 eine Draufsicht auf die pumpraumseitige Seite des Ventilkörpers in einer ersten Ausführungsform,
  • Figur 4 eine Draufsicht auf die pumpraumseitige Seite des Ventilkörpers in einer zweiten Ausführungsform, und
  • Figur 5 einen Querschnitt der Trennwand im Bereich des Auslassventils.
In the following two embodiments of the invention will be explained in more detail with reference to the drawings. Show it:
  • FIG. 1 an opened motor vehicle vacuum pump with a view to the separating wall separating the pump space from the outlet space, in which an outlet valve is provided,
  • FIG. 2 a plan view of the partition wall including the valve seat in the region of the exhaust valve,
  • FIG. 3 a plan view of the pump chamber side of the valve body in a first embodiment,
  • FIG. 4 a plan view of the pump chamber side of the valve body in a second embodiment, and
  • FIG. 5 a cross section of the partition wall in the region of the exhaust valve.

In der Figur 1 ist eine geöffnete Kraftfahrzeug-Vakuumpumpe 10 dargestellt, bei der eine Trennwand 22 sichtbar ist, die einen Pumpraum 12 von einem Auslassraum 14 trennt, wie in der Querschnittsdarstellung der Figur 5 dargestellt. Die Vakuumpumpe 10 ist eine so genannte mechanische Vakuumpumpe, die mechanisch durch einen Verbrennungsmotor angetrieben wird, also sich mit einer zu der Drehzahl des Verbrennungsmotors proportionalen Drehzahl dreht. Beispielsweise wird die Vakuumpumpe 10 im eingebauten Zustand direkt über die Nockenwelle des Verbrennungsmotors angetrieben.In the FIG. 1 an open automotive vacuum pump 10 is shown, in which a partition wall 22 is visible, which separates a pumping space 12 from an outlet space 14, as in the cross-sectional view of FIG. 5 shown. The vacuum pump 10 is a so-called mechanical vacuum pump, which is mechanically driven by an internal combustion engine, that rotates with a speed proportional to the speed of the internal combustion engine. For example, the vacuum pump 10 is driven in the installed state directly via the camshaft of the engine.

Die Vakuumpumpe 10 ist als Verdichteter-Pumpe ausgebildet, und verdichtet diskontinuierlich Gas, insbesondere Luft. Um zwischen zwei Druckintervallen ein Rückströmen des Gases aus dem Auslassraum 14 zurück in den Pumpraum 12 zu verhindern, ist an der Trennwand 22 ein Auslassventil 20 vorgesehen, das bei einem entsprechenden Überdruck im Pumpraum 12 öffnet und bei Nicht-Überdruck im Pumpraum 12 einen Rückfluss des Gases aus dem Auslassraum 14 zurück in den Pumpraum 12 verhindert.The vacuum pump 10 is designed as a compacting pump, and compresses discontinuously gas, in particular air. In order to prevent a backflow of the gas from the outlet chamber 14 back into the pump chamber 12 between two pressure intervals, an outlet valve 20 is provided on the partition 22, which opens at a corresponding overpressure in the pump chamber 12 and at non-overpressure in the pump chamber 12, a return flow of the Gas from the outlet chamber 14 back into the pump chamber 12 prevented.

Das Auslassventil 20 ist In Figur 5 zusammen mit der Trennwand 22 im Querschnitt dargestellt. Das Auslassventil 20 ist als so genanntes Federblatt-Ventil ausgebildet. In der Trennwand 22 ist eine längsovalgekrümmte Ventilöffnung 24 vorgesehen. Auf der auslassraumseitigen Seite 23 der Trennwand 22, der die pumpraumseitige Seite 21 gegenüberliegt, ist ein Ventilkörper 40;40' fixiert, der in einer ersten Ausführungsform in der Figur 3 und in einer zweiten Ausführungsform In der Figur 4 in Draufsicht auf seine pumpraumseitige Seite im Detail dargestellt ist. Der Ventilkörper 40;40' weist in Längserstreckung jeweils drei Abschnitte auf, nämlich den Schließkörper-Abschnitt 43;43', den Gelenk-Abschnitt 44 und den Befestigung-Abschnitt 46.The outlet valve 20 is In FIG. 5 represented together with the partition wall 22 in cross section. The outlet valve 20 is designed as a so-called spring leaf valve. In the partition 22, a longitudinally oval-curved valve opening 24 is provided. On the outlet chamber side 23 of the partition 22, which faces the pump chamber side 21, a valve body 40, 40 'is fixed, which in a first embodiment in the FIG. 3 and in a second embodiment in the FIG. 4 is shown in detail in plan view of his pump room side side. The valve body 40, 40 'has three sections in the longitudinal extent, namely the closing body section 43, 43', the hinge section 44 and the fastening section 46.

Der Ventilkörper 40; 40' besteht aus Federblech und weist in seinem Gelenk-Abschnitt 44 eine Verjüngung 45 auf wodurch der Ventilkörper 40; 40' in diesem Abschnitt 44 leichter biegbar ausgebildet ist als in den daran angrenzenden Abschnitten 46,43. In dem Befestigungs-Abschnitt 46 weist der Ventilkörper 40;40' eine Befestigungs-Öffnung 48 und eine Ausnehmung 52 auf. Der Ventilkörper 40 ist mit einem Befestigungsmittel 50 in einer beispielsweise mit einem Gewinde versehenen Bohrung 28 der Trennwand 22 fixiert. Das Befestigungsmittel 50 kann eine Schraube, einen Niete oder ein anderes geeignetes Befestigungsmittel sein. Die Ausnehmung 52 umgreift eine erhabene Haltenase 24 der Trennwand 22, so dass der Ventilkörper 40 durch das Befestigungsmittel 50 und die Haltenase 24 eindeutig und unverdrehbar an der Trennwand 22 fixiert ist. Im Bereich des Gelenk-Abschnittes 44 des Ventilkörpers 40 weist die Trennwand 22 eine Gelenk-Vertiefung 26 auf.The valve body 40; 40 'consists of spring plate and has in its joint portion 44 a taper 45, whereby the valve body 40; 40 'is formed in this section 44 easier bendable than in the adjacent sections 46,43. In the attachment section 46, the valve body 40, 40 'has a mounting opening 48 and a recess 52. The valve body 40 is fixed with a fastening means 50 in an example provided with a threaded bore 28 of the partition 22. The fastener 50 may be a screw, a rivet, or other suitable fastener. The recess 52 engages around a raised retaining lug 24 of the partition wall 22, so that the valve body 40 is fixed by the fastening means 50 and the retaining lug 24 clearly and non-rotatably on the partition wall 22. In the region of the joint portion 44 of the valve body 40, the partition wall 22 has a joint depression 26.

An dem anderen Längsende des Ventilkörpers 40; 40' ist ein Schließkörper 42,42' angeordnet, der in seiner in der Figur 5 dargestellten Schließposition die Ventilöffnung 24 vollständig verschließt.At the other longitudinal end of the valve body 40; 40 'is a closing body 42,42' arranged in his in the FIG. 5 shown closed position completely closes the valve opening 24.

Auf der auslassseitigen Seite 23 weist die Trennwand 22 einen in Bezug auf die Trennwand-Grundebene erhaben und eben ausgebildeten Ventilsitz 30 auf, auf den der korrespondierende streifenartige Randbereich der in den Figuren 3 und 4 dargestellten pumpraumseitigen Seite des Schließkörpers in der Schließposition 42 aufliegt. Der stegartige Ventilsitz 30 weist eine erhabene Höhe gegenüber den Nachbarbereichen von ca. 1 mm auf.On the outlet-side 23, the partition wall 22 has a valve seat 30 which is raised in relation to the partition wall ground plane and has a planar design, onto which the corresponding strip-like edge region of the valve seat 30 extends FIGS. 3 and 4 shown pumping chamber side of the closing body rests in the closed position 42. The web-like valve seat 30 has a raised height with respect to the neighboring areas of about 1 mm.

In dem in den Figuren 3 und 5 dargestellten ersten Ausführungsbeispiel weist der Ventilsitz 30 bis 50 Mikronuten 32 auf, die in lateraler Richtung orientiert sind, also sternartig von innen nach außen verlaufen und sich nicht kreuzen. Die Mikronuten 32 sind im ungefähr senkrecht zum Öffnungsrand orientiert. Die Mikronuten 32 sind durch Lasergravur in den Ventilsitz 30 eingebracht worden. Die Mikronuten 32 haben typischerweise eine Nuttiefe t von 0,025 mm und einen Nutbreite b von 0, 1 mm. Die Länge I der Mikronuten 32 kann 1,0 bis 2,0 mm betragen, der seitliche Abstand d zweier benachbarter Mikronuten zueinander beträgt weniger ein als 1,0 mm. In jedem Fall ist der mittlere seitliche Abstand d stets kleiner als die Länge I der Mikronuten 32.In the in the Figures 3 and 5 illustrated first embodiment, the valve seat 30 to 50 micro grooves 32, which are oriented in the lateral direction, ie star-like run from the inside to the outside and do not intersect. The microgrooves 32 are oriented approximately perpendicular to the opening edge. The microgrooves 32 have been laser engraved into the valve seat 30. The microgrooves 32 typically have a groove depth t of 0.025 mm and a groove width b of 0.1 mm. The length I of the microgrooves 32 may be 1.0 to 2.0 mm, the lateral distance d of two adjacent microgrooves to each other is less than 1.0 mm. In any case, the mean lateral distance d is always smaller than the length I of the microgrooves 32.

In einer zweiten Ausführungsform weist der Ventilkörper 40' auf seiner dem Ventilsitz 30 zugewandten Seite Mikronuten 32' auf, die die gleichen Maße und Orientierungen aufweisen, wie die Mikronuten 32 in dem Ventilsitz 30. Der Ventilkörper 40' mit Mikronuten 32' kann kombiniert sein mit einem Ventilsitz ohne Mikronuten, oder aber mit einem Ventilsitz 30 gemäß den Figuren 2 und 5 mit Mikronuten 32.In a second embodiment, the valve body 40 'has on its side facing the valve seat 30 microgrooves 32' having the same dimensions and orientations as the microgrooves 32 in the valve seat 30. The valve body 40 'having microgrooves 32' may be combined with a valve seat without micro grooves, or with a valve seat 30 according to the Figures 2 and 5 with micro grooves 32.

Die Mikronuten 32 an dem Ventilsitz 30 sind an ihren beiden Längsenden offen, so dass die äußeren Längsenden zum Auslassraum hin geöffnet und die inneren Längsenden zum Pumpraum hin geöffnet sind. Auf diese Weise kann an beiden Längsenden stets ein Fluidstrom in die betreffende Mikronuten ein- oder ausströmen, so dass ein entsprechender Druckausgleich in der Mikronut stets möglich ist. Eine Drainage des Ventilsitzes 30 ist bei allen Betriebszuständen des Auslassventils 20 sichergestellt.The microgrooves 32 on the valve seat 30 are open at their two longitudinal ends, so that the outer longitudinal ends open towards the outlet space and the inner longitudinal ends are open towards the pumping space. In this way, at both longitudinal ends, a fluid flow into the respective micro grooves can flow in or out, so that a corresponding pressure equalization in the micro groove is always possible. A drainage of the valve seat 30 is ensured in all operating states of the exhaust valve 20.

Die Vakuumpumpe 10 ist bevorzugt ölgeschmiert, so dass bei einem Öffnungs- und einem Schließvorgang insbesondere Öl durch die Mikronuten 32; 32' zu- und abfließt. Der Ventilkörper 40; 40' ist derart vorgespannt, dass er bei einem Differenzdruck von ca. 0,04 bar öffnet. Durch die Mikronuten 32;32' kann bereits bei dem vorgenannten Differenzdruck das Öl in Richtung Öffnungs-Mitte fließen, so dass der Ölfilm zwischen dem Ventilsitz 30 und dem Schließkörper 42; 43' schnell abreißt. Hierdurch wird eine harmonische Öffnungsbewegung des Ventilkörpers 40 ermöglicht, so dass die Schallemissionen erheblich reduziert sind. Dies gilt analog auch für die Schließbewegung.The vacuum pump 10 is preferably lubricated with oil, so that, in particular, oil is allowed to flow through the microgrooves 32 during an opening and a closing operation. 32 'flows in and out. The valve body 40; 40 'is biased so that it opens at a differential pressure of about 0.04 bar. As a result of the micro-grooves 32, 32 ', the oil can already flow in the direction of the opening center at the aforementioned differential pressure, so that the oil film between the valve seat 30 and the closing body 42; 43 'quickly breaks off. As a result, a harmonic opening movement of the valve body 40 is made possible, so that the noise emissions are significantly reduced. This also applies analogously to the closing movement.

Claims (10)

Kraftfahrzeug- Vakuumpumpe (10) mit
einem Pumpraum (12), in dem ein Pumpenrotor verdichtend rotiert, einem Auslassraum (14), in den das verdichtete Gas aus dem Pumpraum (12) austritt,
einer Trennwand (22), die den Pumpraum (12) von dem Auslassraum (14) abtrennt, und
einem als Rückschlagventil ausgebildeten Auslassventil (20) in der Trennwand (22), durch das das komprimierte Gas aus dem Pumpraum (12) in den Auslassraum (14) austritt,
wobei das Auslassventil (20) von einer Ventilöffnung (24) in der Trennwand (22) und einem Ventilkörper (40;40') mit einem Schließkörper (42) gebildet wird,
wobei auf der Austrittsseite der Trennwand (22) um die Ventilöffnung (24) herum ein Ventilsitz (30) vorgesehen ist, auf den der korrespondierende Teil des Schließkörpers (42) des Ventilkörpers (40; 40') in seiner Schließstellung aufliegt, und
wobei der Ventilsitz (30) und/oder der korrespondierende Teil des Schließkörpers (42;42') mehrere Mikronuten (32; 32') aufweist, die in lateraler Richtung orientiert sind.Automotive vacuum pump (10) with
a pumping space (12) in which a pump rotor rotates in compression, an outlet space (14) into which the compressed gas leaves the pump space (12),
a partition (22) separating the pump space (12) from the outlet space (14), and
an outlet valve (20) in the dividing wall (22) designed as a check valve, through which the compressed gas exits the pump space (12) into the outlet space (14),
the outlet valve (20) being formed by a valve opening (24) in the dividing wall (22) and a valve body (40; 40 ') having a closing body (42),
wherein on the outlet side of the partition wall (22) around the valve opening (24) around a valve seat (30) is provided, on which the corresponding part of the closing body (42) of the valve body (40, 40 ') rests in its closed position, and
wherein the valve seat (30) and / or the corresponding part of the closing body (42; 42 ') has a plurality of micron grooves (32; 32') which are oriented in the lateral direction. Kraftfahrzeug- Vakuumpumpe (10) nach Anspruch 1, wobei die Nuttiefe t der Mikronuten (32; 32') geringer als 0,2 mm, und besonders bevorzugt kleiner als 0,1 mm ist.A motor vehicle vacuum pump (10) according to claim 1, wherein the groove depth t of the microgrooves (32; 32 ') is less than 0.2 mm, and more preferably less than 0.1 mm. Kraftfahrzeug- Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei die Nutbreite b der Mikronuten (32; 32') geringer als 0,5 mm, besonders bevorzugt geringer als 0,25 mm ist.Motor vehicle vacuum pump (10) according to one of the preceding claims, wherein the groove width b of the microgrooves (32; 32 ') is less than 0.5 mm, particularly preferably less than 0.25 mm. Kraftfahrzeug- Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei über mindestens die Hälfte des Ventilsitzes (30) das Verhältnis der Länge I der Mikronuten (32; 32') zu ihrem gegenseitigen seitlichen Abstand d größer als 1,0 ist.A motor vehicle vacuum pump (10) according to any one of the preceding claims, wherein over at least half of the valve seat (30) the ratio of the length l of the microgrooves (32; 32 ') to their mutual lateral distance d is greater than 1.0. Kraftfahrzeug-Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei sich die Mikronuten (32; 32') nicht kreuzen.A motor vehicle vacuum pump (10) according to any one of the preceding claims, wherein the microgrooves (32; 32 ') do not intersect. Kraftfahrzeug-Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei die die Mikronuten (32; 32') nur an dem Ventilsitz (30) oder dem Schließkörper (42') vorgesehen sind.Motor vehicle vacuum pump (10) according to one of the preceding claims, wherein the micro grooves (32; 32 ') are provided only on the valve seat (30) or the closing body (42'). Kraftfahrzeug-Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei ein Längsende der Mikronuten (32; 32') zur Ventilöffnung (24) und das andere Längsende zum Auslassraum (14) geöffnet ist.A motor vehicle vacuum pump (10) as claimed in any one of the preceding claims, wherein one longitudinal end of the microgrooves (32; 32 ') is open to the valve opening (24) and the other longitudinal end is opened to the outlet space (14). Kraftfahrzeug-Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei der Ventilsitz (30) erhaben ausgebildet ist.Motor vehicle vacuum pump (10) according to one of the preceding claims, wherein the valve seat (30) is formed raised. Kraftfahrzeug-Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei die Mikronuten (32; 32') durch Lasergravur oder Prägen hergestellt sind.A motor vehicle vacuum pump (10) according to any one of the preceding claims, wherein the microgrooves (32; 32 ') are made by laser engraving or embossing. Kraftfahrzeug-Vakuumpumpe (10) nach einem der vorangegangenen Ansprüche, wobei der Ventilkörper (40; 40') als Blattfeder ausgebildet ist.Motor vehicle vacuum pump (10) according to one of the preceding claims, wherein the valve body (40; 40 ') is designed as a leaf spring.
EP14155617.5A 2014-02-18 2014-02-18 Motor vehicle vacuum pump Active EP2908011B1 (en)

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EP14155617.5A EP2908011B1 (en) 2014-02-18 2014-02-18 Motor vehicle vacuum pump
JP2016547523A JP6490699B2 (en) 2014-02-18 2015-02-02 Automotive vacuum pump
PCT/EP2015/052090 WO2015124415A1 (en) 2014-02-18 2015-02-02 Motor vehicle vacuum pump
CN201580008803.4A CN106030114B (en) 2014-02-18 2015-02-02 Motor vehicle vavuum pump
US15/115,694 US11047391B2 (en) 2014-02-18 2015-02-02 Motor vehicle vacuum pump

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Also Published As

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CN106030114A (en) 2016-10-12
JP2017503965A (en) 2017-02-02
EP2908011B1 (en) 2017-11-08
WO2015124415A1 (en) 2015-08-27
CN106030114B (en) 2018-01-02
JP6490699B2 (en) 2019-03-27
US20170009770A1 (en) 2017-01-12
US11047391B2 (en) 2021-06-29

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