EP3631189B1 - High-pressure fuel pump and fuel filter device - Google Patents
High-pressure fuel pump and fuel filter device Download PDFInfo
- Publication number
- EP3631189B1 EP3631189B1 EP18719108.5A EP18719108A EP3631189B1 EP 3631189 B1 EP3631189 B1 EP 3631189B1 EP 18719108 A EP18719108 A EP 18719108A EP 3631189 B1 EP3631189 B1 EP 3631189B1
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- EP
- European Patent Office
- Prior art keywords
- section
- fuel
- filter device
- pump
- fuel filter
- 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.)
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Links
- 239000000446 fuel Substances 0.000 title claims description 64
- 239000012530 fluid Substances 0.000 description 14
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/34—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements by the filter structure, e.g. honeycomb, mesh or fibrous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/44—Filters structurally associated with pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/27—Fuel-injection apparatus with filters
Definitions
- the invention relates to high-pressure fuel pumps and fuel filter devices according to the preambles of the independent claims.
- the DE 10 2014 225 319 A1 describes a high-pressure fuel pump with a housing, an inlet, a delivery section, and an outlet.
- the high-pressure fuel pump is designed as a piston pump, and the delivery section accordingly includes a pump piston.
- a fuel filter device in the DE 10 2014 225 319 A1 not explicitly mentioned, but one is usually present in order to keep contaminants present in the fuel away from sensitive areas of the high-pressure fuel pump.
- the filter device is usually designed in the manner of a cylindrical pot, the flow through the filter section being from the outside inwards and the fuel flowing out of the filter device through the annular base section.
- valve for metering fluid which has a flow channel for the fluid leading from a fluid inlet to a metering opening and a filter device arranged in the flow channel through which the fluid flows.
- a high-pressure fuel pump not according to the invention comprises a pump housing, an inlet, a fuel filter device, a delivery section and an outlet.
- the fuel filter device has an annular base section and an overall at least approximately cylindrical filter section extending therefrom.
- the filter section in turn, has a plurality of web sections extending longitudinally from the base section.
- a screen section is arranged between each two adjacent web sections.
- the fuel filter assembly also includes a cap-like end portion remote from the base portion in the longitudinal direction.
- a first edge area of the screen section adjacent to the base section and/or a second edge area of the screen section adjacent to the end section are/is concavely curved towards this center when viewed from a center of the screen section lying in the plane of a lateral surface of the cylindrical filter section.
- the high-pressure fuel pump which is not according to the invention, has an increased service life and reliability, as well as an improved pump performance over the service life.
- Overall, rounded edge areas of a sieve section are realized in this way in the top view.
- the concave curvature that is meant here is not the curvature around a longitudinal axis of the fuel filter device that is already present and runs in the circumferential direction. Rather, the concave curvature referred to here lies more or less in the plane of a cylindrical lateral surface of the fuel filter device and runs in the axial direction, so to speak.
- the high-pressure fuel pump which is not according to the invention, and the corresponding fuel filter device are based on the knowledge that when there is a flow through the fuel filter device from the outside to the inside, as is the case with numerous high-pressure fuel pumps, there is a risk that a screen section that is Seen from the longitudinal axis of the fuel filter device, it actually curves outwards, folds inwards. This applies in particular when dirt particles have accumulated on the filter section. This also results in considerable bending stress on the web sections, especially in those areas that are adjacent to the base section or end section, which increases the risk of a web section breaking in these areas. This applies in particular when a screen section flaps back and forth as a result of load changes. However, these are precisely those areas which are now wider and thus reinforced due to the design according to the invention, which in turn reduces the risk of breakage in these areas.
- the first and/or the second edge area be elliptically or parabolically or circularly curved.
- An elliptical or parabolic curvature has the advantage that the widening of the web sections in the immediate vicinity of the base section and/or the end section is particularly large. If an ellipse is used as the basic geometry, it can be created from a conic or cylindrical section.
- the length of the curved first edge area, which is therefore adjacent to the base section is greater than the length of the curved second edge area, which is therefore adjacent to the end section.
- a lateral transition region between a web section and the end section and/or the base section is concave when viewed from the outside.
- notch-reducing radii are used in accordance with the present invention, thereby reducing localized stresses, which increases the life of the fuel filter assembly. This is possible in particular because of the concave curvature of the first and second edge regions provided according to the invention.
- the high-pressure fuel pump according to the invention is basically identical in structure to the high-pressure fuel pump mentioned above, which is not according to the invention.
- the strainer section of the fuel filter device is not curved radially outward in the normal state, but is essentially flat overall, so that the filter section has an overall polygonal cross section. Due to the principle, such a screen section cannot fold inwards even under the highest pressure load, for example due to dirt particles accumulated on the screen section, which means that the reduction in the possible outflow cross section and the resulting increase in flow resistance that would otherwise occur when flaps inwards do not occur.
- the measure according to the invention means that the area of a screen section available for the throughflow is reduced compared to a screen section curved radially outwards.
- this reduction hardly affects the efficiency or the pump performance of the high-pressure fuel pump.
- a high-pressure fuel pump contributes to the figures 1 and 2 overall reference numeral 10. It comprises a pump housing 12 which has a substantially cylindrical or rotationally symmetrical shape. In a side wall of the pump housing 12 is as shown figure 1 As can be seen, an inlet 14 is formed by an inlet connection piece 16 which is welded to the pump housing 12 . A first fluid channel section 18 runs inward in the radial direction in the pump housing 12 from the inlet 14 . It merges into a second fluid channel section 20, which runs upwards in the axial direction in the pump housing 12, up to a pressure damper device 22. This is a diaphragm damper, which is not described further here. The pressure damper device 22 is accommodated in a damper chamber 24 which is formed between an upper face 26 of the pump housing 12 and a housing cover 28 welded onto the pump housing 12 . The fluid channel section 20 opens into the damper chamber 24.
- a third fluid channel section 30 extends from the upper end face 26, ie away from the damper chamber 24, to in front of an inlet valve 32, which is designed as a quantity control valve.
- the inlet valve 32 can be held in an open position in a manner that is not described in detail here.
- the inlet valve 32 is designed as a non-return valve which opens towards a conveying chamber 34 .
- the pumping chamber 34 is essentially delimited by a wall of a blind hole (no reference number) extending axially in the pump housing 12 and a pump piston 36.
- the pump piston 36 is guided in a piston bushing (no reference number) with a sliding fit and can be moved in the axial direction.
- the delivery chamber 34 and the pump piston 36 together form a delivery section 38.
- a fourth fluid channel section 40 branches off in the radial direction from the conveying chamber 34 and leads via an outlet valve 42 designed as a check valve to an outlet connector 44 which forms an outlet 46 .
- the outlet port 44 is welded to the side wall of the pump housing 12 .
- a space (without reference number) located between the outlet valve 42 and the outlet socket 44 can be connected to the conveying space 34 via a pressure-limiting valve 48 .
- the high-pressure fuel pump 10 is part of a fuel system, not shown, of an internal combustion engine. Fuel is delivered to the inlet 14 at relatively low pressure by a pre-supply pump. From the outlet 46, fuel is conveyed under relatively high pressure to a fuel rail, to which injectors are connected, which inject the fuel into the combustion chambers of the internal combustion engine. The fuel first reaches the pressure damper device 22 through the inlet 14 and from there via the inlet valve 32 to the pumping chamber 34 , where it is compressed to a high pressure and ejected via the outlet 46 . The direction of flow in the first fluid channel section 18 and in the second fluid channel section 20 is in figure 1 indicated by an arrow 49.
- a fuel filter device 50 is arranged in the first fluid channel section 18 .
- This is pot-shaped overall and includes an annular base portion 52, which is made of brass in the present case is produced and is held in the first fluid channel section 18 via a press fit, that is to say is pressed into the first fluid channel section 18 .
- annular base portion 52 which is made of brass in the present case is produced and is held in the first fluid channel section 18 via a press fit, that is to say is pressed into the first fluid channel section 18 .
- An approximately cylindrical or cup-shaped filter section 54 extends axially downward away from the damper chamber 24.
- the filter section 54 is made of PPS plastic in the present case. It comprises a total of three web sections 56 which protrude from the base section 52 in the axial direction of the base section 52 .
- a screen section 58 formed by a screen-like filter means is present between each two adjacent web sections 56 .
- the lower protruding ends of the web sections 56 are connected to one another by an annular and upwardly closed cap-like end section 60, which is also made of PPS plastic.
- the end portion 60 is thus located remote from the base portion 52 .
- the filter device 50 could also be made entirely of plastic.
- the filter section 54 extends as seen from the base section 52 approximately counter to the direction of flow (arrow 49) of the fuel. This means that the fuel passes through the sieve sections 58 from radially outside to radially inside and then flows out of the fuel filter device 50 axially upwards through the base section 52 .
- a longitudinal axis of the fuel filter device 50 carries in figure 3 reference numeral 62.
- the base portion 52 has a larger outer diameter than the filter portion 54.
- the in figure 3 Visible sieve section 58 has two straight lateral longitudinal edges 64 that run parallel to the longitudinal axis 62, are spaced apart from one another by a distance a when viewed in the circumferential direction of the filter section 54.
- a first axial edge region 66 of the sieve section 58 is adjacent to the base section 52, and a second axial edge region 68 of the Screen section 58 is adjacent to end section 60 .
- the first edge region 66 is concavely curved towards this center 70 , namely elliptically, viewed from a center 70 of the sieve section 58 located on an imaginary cylindrical lateral surface of the filter section 54 .
- the first edge area could also be parabolically or circularly curved.
- the second edge region 68 is also concave, viewed from the center 70 of the sieve section 58, towards this center 70, namely again elliptically curved. Again, in an embodiment that is not shown, the second edge area could also be parabolically or circularly curved.
- lateral transitional areas 74 between the web sections 56 and the end section 60 and between the web sections 56 and the base section 52 are designed to be concavely rounded, as seen from the radial outside.
- lateral transitional areas 76, with which the web sections 56 run into a conical transitional area 78, which is present between the filter section 54 and the base section 52 are concavely rounded off, as seen from the radial outside.
- a developed length of the sieve section 58 in the circumferential direction between two adjacent web sections 56 is designated as a.
- b denotes a circumferential width of a land portion 56 (in an embodiment where one land portion has a different width than another land portion, b denotes the width of the circumferentially thinnest land portion).
- I becomes one Total length of a screen section 58 measured in the longitudinal direction 62 denotes.
- the course of the first edge region 66 can follow an ellipse, the extent of which is between 0.1 and 1 times l, seen in the longitudinal direction 62 of the fuel filter device 50, and the extent of which in the circumferential direction is between 0.1 and 0.5 times a. Furthermore, the course of the first edge area 66 can follow a radius with a radius dimension in the range of 0.1-0.5 times a. The first edge region 66 can be rounded towards the web sections 56 and towards the base section 52 either by a radius in the range of 0.1-0.5 times a or by an ellipse whose main or secondary vertex is smaller than a.
- the dimensioning rules mentioned above for the first edge area 66 can also be applied to the second edge area 68 in the same way.
- lateral transition areas 74 and 76 that their rounding can be in the range of 0.1-0.5 times a when using a radius.
- the major or minor vertex can be no more than 0.5 times a. Further rounding of edges of the web sections 56 can be carried out in the same way.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Die Erfindung betrifft Kraftstoff-Hochdruckpumpen sowie Kraftstoff-Filtereinrichtungen nach den Oberbegriffen der nebengeordneten Ansprüche.The invention relates to high-pressure fuel pumps and fuel filter devices according to the preambles of the independent claims.
Die
Aus der
Aus der
Das der Erfindung zugrunde liegende Problem wird durch Kraftstoff-Hochdruckpumpen sowie Kraftstoff-Filtereinrichtungen mit den Merkmalen der nebengeordneten Ansprüche gelöst.The problem on which the invention is based is solved by high-pressure fuel pumps and fuel filter devices with the features of the independent claims.
Eine nicht erfindungsgemäße Kraftstoff-Hochdruckpumpe umfasst ein Pumpengehäuse, einen Einlass, eine Kraftstoff-Filtereinrichtung, einen Förderabschnitt und einen Auslass. Die Kraftstoff-Filtereinrichtung weist einen ringförmigen Basisabschnitt und einen sich von dieser aus erstreckenden insgesamt mindestens in etwa zylindrischen Filterabschnitt auf. Der Filterabschnitt wiederum weist eine Mehrzahl von Stegabschnitten auf, die sich in Längsrichtung vom Basisabschnitt aus erstrecken. Jeweils zwischen zwei benachbarten Stegabschnitten ist ein Siebabschnitt angeordnet. Zu der Kraftstoff-Filtereinrichtung gehört ferner ein vom Basisabschnitt in Längsrichtung gesehen entfernt angeordneter kappenartiger Endabschnitt. Ein zum Basisabschnitt benachbarter erster Randbereich des Siebabschnitts und/oder ein zum Endabschnitt benachbarter zweiter Randbereich des Siebabschnitt sind/ist von einem in der Ebene einer Mantelfläche des zylindrischen Filterabschnitts liegenden Zentrum des Siebabschnitts aus gesehen zu diesem Zentrum hin konkav gekrümmt.A high-pressure fuel pump not according to the invention comprises a pump housing, an inlet, a fuel filter device, a delivery section and an outlet. The fuel filter device has an annular base section and an overall at least approximately cylindrical filter section extending therefrom. The filter section, in turn, has a plurality of web sections extending longitudinally from the base section. A screen section is arranged between each two adjacent web sections. The fuel filter assembly also includes a cap-like end portion remote from the base portion in the longitudinal direction. A first edge area of the screen section adjacent to the base section and/or a second edge area of the screen section adjacent to the end section are/is concavely curved towards this center when viewed from a center of the screen section lying in the plane of a lateral surface of the cylindrical filter section.
Die nicht erfindungsgemäße Kraftstoff-Hochdruckpumpe weist gegenüber dem Stand der Technik eine erhöhte Lebensdauer und Zuverlässigkeit auf, sowie eine über die Lebensdauer gesehen verbesserte Pumpleistung. Dies wird erreicht, indem die Stegabschnitte in den axialen Randbereichen der Siebabschnitte verstärkt ausgeführt werden, indem sie in Umfangsrichtung gesehen breiter ausgeführt sind. Dies wird wiederum dadurch bewirkt, dass der erste axiale Randbereich bzw. der zweite axiale Randbereich eines Siebabschnitts vom Zentrum des Siebabschnitts aus gesehen konkav gekrümmt ist. Insgesamt werden auf diese Weise in der Draufsicht abgerundete Randbereiche eines Siebabschnitts realisiert. Es versteht sich dabei, dass die konkave Krümmung, die hier gemeint ist, nicht jene ohnehin vorhandene in Umfangsrichtung verlaufende Krümmung um eine Längsachse der Kraftstoff-Filtereinrichtung ist. Vielmehr liegt die hier gemeinte konkave Krümmung quasi in der Ebene einer zylindrischen Mantelfläche der Kraftstoff-Filtereinrichtung und verläuft sozusagen in axialer Richtung.Compared to the prior art, the high-pressure fuel pump, which is not according to the invention, has an increased service life and reliability, as well as an improved pump performance over the service life. This is achieved in that the web sections are reinforced in the axial edge regions of the screen sections by being made wider as seen in the circumferential direction. This is in turn caused by the fact that the first axial edge area or the second axial edge area of a screen section is concavely curved as viewed from the center of the screen section. Overall, rounded edge areas of a sieve section are realized in this way in the top view. It goes without saying that the concave curvature that is meant here is not the curvature around a longitudinal axis of the fuel filter device that is already present and runs in the circumferential direction. Rather, the concave curvature referred to here lies more or less in the plane of a cylindrical lateral surface of the fuel filter device and runs in the axial direction, so to speak.
Die nicht erfindungsgemäße Kraftstoff-Hochdruckpumpe sowie die entsprechende Kraftstoff-Filtereinrichtung basieren auf der Erkenntnis, dass bei einer Durchströmung der Kraftstoff-Filtereinrichtung von außen nach innen, wie sie bei zahlreichen Kraftstoff-Hochdruckpumpen vorliegt, die Gefahr besteht, dass ein Siebabschnitt, der von einer Längsachse der Kraftstoff-Filtereinrichtung aus gesehen eigentlich nach außen gekrümmt ist, nach innen klappt.Dies gilt insbesondere dann, wenn sich auf dem Siebabschnitt Schmutzpartikel angelagert haben. Auch hierdurch kommt es zu einer erheblichen Biegebelastung der Stegabschnitte vor allem in jenen Bereichen, die zum Basisabschnitt bzw. zum Endabschnitt benachbart sind, wodurch die Gefahr eines Bruchs eines Stegabschnitts in diesen Bereichen erhöht wird. Dies gilt insbesondere dann, wenn es durch Lastwechsel zu einem Hin- und Her-Klappen eines Siebabschnitts kommt. Dies sind jedoch genau jene Bereiche, die aufgrund der erfindungsgemäßen Auslegung nunmehr breiter und somit verstärkt sind, wodurch eine Bruchgefahr in diesen Bereichen wiederum reduziert wird.The high-pressure fuel pump, which is not according to the invention, and the corresponding fuel filter device are based on the knowledge that when there is a flow through the fuel filter device from the outside to the inside, as is the case with numerous high-pressure fuel pumps, there is a risk that a screen section that is Seen from the longitudinal axis of the fuel filter device, it actually curves outwards, folds inwards. This applies in particular when dirt particles have accumulated on the filter section. This also results in considerable bending stress on the web sections, especially in those areas that are adjacent to the base section or end section, which increases the risk of a web section breaking in these areas. This applies in particular when a screen section flaps back and forth as a result of load changes. However, these are precisely those areas which are now wider and thus reinforced due to the design according to the invention, which in turn reduces the risk of breakage in these areas.
Zwar wird durch die Maßnahme die für die Durchströmung zur Verfügung stehende Fläche eines Siebabschnitts reduziert. Es hat sich jedoch herausgestellt, dass sich diese Reduktion nur geringfügig bzw. vernachlässigbar auf den Wirkungsgrad bzw. die Pumpleistung der Kraftstoff-Hochdruckpumpe auswirkt.It is true that the measure reduces the area of a screen section available for the throughflow. However, it has been found that this reduction has only a slight or negligible effect on the efficiency or the pumping capacity of the high-pressure fuel pump.
In einer ersten Weiterbildung wird vorgeschlagen, dass der erste und/oder der zweite Randbereich elliptisch oder parabolisch oder kreisförmig gekrümmt sind. Eine elliptische oder parabolische Krümmung hat den Vorteil, dass hierdurch die Verbreiterung der Stegabschnitte in der unmittelbaren Nachbarschaft zum Basisabschnitt und/oder zum Endabschnitt besonders groß ist. Wird eine Ellipse als Basisgeometrie verwendet, kann sie aus einem Kegel- oder Zylinderschnitt erzeugt sein.In a first development, it is proposed that the first and/or the second edge area be elliptically or parabolically or circularly curved. An elliptical or parabolic curvature has the advantage that the widening of the web sections in the immediate vicinity of the base section and/or the end section is particularly large. If an ellipse is used as the basic geometry, it can be created from a conic or cylindrical section.
Ferner ist möglich, dass, in Längsrichtung gesehen, die Länge des gekrümmten ersten Randbereichs, der also zu dem Basisabschnitt benachbart ist, größer ist als die Länge des gekrümmten zweiten Randbereichs, der also zu dem Endabschnitt benachbart ist. Dem liegt die Überlegung zugrunde, dass dann, wenn der entsprechende Siebabschnitt aufgrund der Durchströmung von außen nach innen nach innen klappt, jener Bereich des Siebabschnitts, der dann den geringsten Abstand zur Längsachse der Kraftstoff-Filtereinrichtung aufweist und damit am stärksten drosselt, nicht in der Mitte zwischen dem Basisabschnitt und dem Endabschnitt liegt, sondern zum Endabschnitt hin verschoben ist, also näher zum Endabschnitt liegt als zum Basisabschnitt. Somit steht für das Abströmen des Kraftstoffs aus der Kraftstoff-Filtereinrichtung ein insgesamt größerer Querschnitt zur Verfügung, wodurch das Gesamtdruckgefälle über die Kraftstoff-Filtereinrichtung reduziert wird.It is also possible that, viewed in the longitudinal direction, the length of the curved first edge area, which is therefore adjacent to the base section, is greater than the length of the curved second edge area, which is therefore adjacent to the end section. This is based on the consideration that when the corresponding screen section folds inwards due to the flow from the outside inwards, that area of the screen section which then has the smallest distance to the longitudinal axis of the fuel filter device and thus throttles the most, is not in the middle between the base section and the end section, but is shifted towards the end section, i.e. is closer to the end section than to the base section. An overall larger cross-section is therefore available for the fuel to flow out of the fuel filter device, as a result of which the total pressure drop across the fuel filter device is reduced.
Besonders vorteilhaft ist ferner, wenn ein seitlicher Übergangsbereich zwischen einem Stegabschnitt und dem Endabschnitt und/oder dem Basisabschnitt, von außen gesehen, konkav ist. Dort, wo bei den Kraftstoff-Filtereinrichtungen des Standes der Technik relativ scharfe Kerben vorhanden waren, werden erfindungsgemäß also kerbreduzierende Radien eingesetzt, wodurch örtliche Spannungen reduziert werden, was die Lebensdauer der Kraftstoff-Filtereinrichtung erhöht. Dies ist insbesondere wegen der erfindungsgemäß vorgesehenen konkaven Krümmung des ersten und des zweiten Randbereichs möglich.Furthermore, it is particularly advantageous if a lateral transition region between a web section and the end section and/or the base section is concave when viewed from the outside. Where there were relatively sharp notches in prior art fuel filter assemblies, notch-reducing radii are used in accordance with the present invention, thereby reducing localized stresses, which increases the life of the fuel filter assembly. This is possible in particular because of the concave curvature of the first and second edge regions provided according to the invention.
Die erfindungsgemäße Kraftstoff-Hochdruckpumpe ist zunächst grundsätzlich identisch aufgebaut wie die oben erwähnte nicht erfindungsgemäße Kraftstoff-Hochdruckpumpe. Jedoch ist der Siebabschnitt der Kraftstoff-Filtereinrichtung im Normalzustand anders als bei der ersten erfindungsgemäßen Kraftstoff-Hochdruckpumpe nicht nach radial außen gekrümmt, sondern insgesamt im Wesentlichen flach eben, so dass der Filterabschnitt einen insgesamt mehreckigen Querschnitt aufweist. Ein solcher Siebabschnitt kann prinzipbedingt auch bei höchster Druckbelastung beispielsweise durch auf dem Siebabschnitt angelagerte Schmutzpartikel nicht nach innen klappen, wodurch die ansonsten bei einem nach innen Klappen hervorgerufene Verringerung des möglichen Ausströmquerschnitts und die hierdurch hervorgerufene Erhöhung des Durchströmwiderstands ausbleiben.The high-pressure fuel pump according to the invention is basically identical in structure to the high-pressure fuel pump mentioned above, which is not according to the invention. However, unlike the first high-pressure fuel pump according to the invention, the strainer section of the fuel filter device is not curved radially outward in the normal state, but is essentially flat overall, so that the filter section has an overall polygonal cross section. Due to the principle, such a screen section cannot fold inwards even under the highest pressure load, for example due to dirt particles accumulated on the screen section, which means that the reduction in the possible outflow cross section and the resulting increase in flow resistance that would otherwise occur when flaps inwards do not occur.
Hierbei gilt, dass durch die erfindungsgemäße Maßnahme die für die Durchströmung zur Verfügung stehende Fläche eines Siebabschnitts gegenüber einem radial nach außen gewölbten Siebabschnitt reduziert ist. Wiederum hat sich jedoch herausgestellt, dass in der Praxis diese Reduktion den Wirkungsgrad bzw. die Pumpleistung der Kraftstoff-Hochdruckpumpe kaum beeinflusst.In this case, the measure according to the invention means that the area of a screen section available for the throughflow is reduced compared to a screen section curved radially outwards. However, it has again been found that in practice this reduction hardly affects the efficiency or the pump performance of the high-pressure fuel pump.
Nachfolgend werden Ausführungsformen der Erfindung unter Bezugnahme auf die beigefügte Zeichnung erläutert. In der Zeichnung zeigen:
- Figur 1
- einen ersten Längsschnitt durch eine erfindungsgemäße Kraftstoff-Hochdruckpumpe;
- Figur 2
- einen zweiten Längsschnitt durch die Kraftstoff-Hochdruckpumpe von
Figur 1 längs einer Linie II-II; - Figur 3
- eine perspektivische Darstellung einer nicht erfindungsgemäßen Kraftstoff-Filtereinrichtung der Kraftstoff-Hochdruckpumpe der
Figuren 1 und2 ; - Figur 4
- einen Schnitt durch einen Endabschnitt der Kraftstoff-Filtereinrichtung von
Figur 3 ; und - Figur 5
- einen Schnitt durch eine erfindungsgemäße Kraftstoff-Filtereinrichtung.
- figure 1
- a first longitudinal section through a high-pressure fuel pump according to the invention;
- figure 2
- a second longitudinal section through the high-pressure fuel pump
figure 1 along a line II-II; - figure 3
- a perspective view of a fuel filter device not according to the invention of the high-pressure fuel pump
figures 1 and2 ; - figure 4
- a section through an end portion of the fuel filter device of
figure 3 ; and - figure 5
- a section through a fuel filter device according to the invention.
Eine Kraftstoff-Hochdruckpumpe trägt in den
Wie aus
Vom Förderraum 34 zweigt in radialer Richtung ein vierter Fluidkanalabschnitt 40 ab, der über ein als Rückschlagventil ausgebildetes Auslassventil 42 zu einem Auslassstutzen 44 führt, welche einen Auslass 46 bildet. Der Auslassstutzen 44 ist an die Seitenwand des Pumpengehäuses 12 angeschweißt. Ein zwischen dem Auslassventil 42 und dem Auslassstutzen 44 gelegener Raum (ohne Bezugszeichen) ist über ein Druckbegrenzungsventil 48 mit dem Förderraum 34 verbindbar.A fourth
Die Kraftstoff-Hochdruckpumpe 10 ist Teil eines nicht weiter dargestellten Kraftstoffsystems einer Brennkraftmaschine. Zum Einlass 14 wird Kraftstoff bei relativ niedrigem Druck durch eine Vorförderpumpe gefördert. Vom Auslass 46 wird Kraftstoff unter relativ hohem Druck zu einem Kraftstoffrail gefördert, an welches Injektoren angeschlossen sind, die den Kraftstoff in Brennräume der Brennkraftmaschine einspritzen. Dabei gelangt der Kraftstoff durch den Einlass 14 zunächst zur Druckdämpfereinrichtung 22 und von dort über das Einlassventil 32 zum Förderraum 34, wo er auf einen hohen Druck verdichtet und über den Auslass 46 ausgestoßen wird. Die Strömungsrichtung im ersten Fluidkanalabschnitt 18 und im zweiten Fluidkanalabschnitt 20 ist in
Wie aus
Man erkennt aus der Darstellung in
Nun wird die Kraftstoff-Filtereinrichtung 50 in einem Beispiel stärker im Detail unter Bezugnahme auf die
Der erste Randbereich 66 ist von einem auf einer gedachten zylindrischen Mantelfläche des Filterabschnitts 54 gelegenen Zentrum 70 des Siebabschnitts 58 aus gesehen zu diesem Zentrum 70 hin konkav, nämlich elliptisch gekrümmt. In einer nicht dargestellten Ausführungsform könnte der erste Randbereich auch parabolisch oder kreisförmig gekrümmt sein. Auch der zweite Randbereich 68 ist von dem Zentrum 70 des Siebabschnitts 58 ausgesehen zu diesem Zentrum 70 hin konkav, nämlich wiederum elliptisch gekrümmt. Wiederum könnte in einer nicht dargestellten Ausführungsform auch der zweite Randbereich parabolisch oder kreisförmig gekrümmt sein. Eine Erstreckung des ersten Randbereichs 66 in axialer Richtung, also in Richtung der Längsachse 62, ist in
Durch die gekrümmten Randbereiche 66 und 68 verfügen die zu diesen Randbereichen 66 und 68 benachbarten Stegabschnitte 56 jeweils über einen verbreiterten Bereich, der in
Besonders vorteilhaft sind bei der in
Der Verlauf des ersten Randbereichs 66 kann einer Ellipse folgen, deren Ausdehnung in Längsrichtung 62 der Kraftstoff-Filtereinrichtung 50 gesehen zwischen 0,1 und 1 mal l beträgt, und deren Ausdehnung in Umfangsrichtung zwischen 0,1 und 0,5 mal a beträgt. Ferner kann der Verlauf des ersten Randbereichs 66 einem Radius folgen mit einem Radius-Maß im Bereich von 0,1-0,5 mal a. Eine Verrundung des ersten Randbereichs 66 zu den Stegabschnitten 56 sowie zum Basisabschnitt 52 hin kann erfolgen wahlweise durch einen Radius im Bereich von 0,1-0,5 mal a oder durch eine Ellipse, deren Haupt- oder Nebenscheitel kleiner als a ist.The course of the first edge region 66 can follow an ellipse, the extent of which is between 0.1 and 1 times l, seen in the
Die oben für den ersten Randbereich 66 genannten Dimensionierungsregeln können in gleicher Weise auch auf den zweiten Randbereich 68 angewendet werden.The dimensioning rules mentioned above for the first edge area 66 can also be applied to the
Für die seitlichen Übergangsbereiche 74 und 76 gilt, dass deren Rundung bei Verwendung eines Radius im Bereich von 0,1-0,5 mal a liegen kann. Bei Verwendung einer ellipsenförmigen Rundung können der Haupt- oder Nebenscheitel keiner als 0,5 mal a sein. Weitere Verrundungen von Kanten der Stegabschnitte 56 können in der gleichen Weise durchgeführt werden.It applies to the
Nun wird auf die in
Man erkennt aus
Claims (2)
- Fuel filter device (50) having an annular base section (52) and having an altogether cylindrical filter section (54) which extends from said base section, wherein the filter section (54) has a plurality of web sections (56) which extend from the base section (52) in a longitudinal direction (62), has in each case a screen section (58) between two adjacent web sections (56), and has an end section (60) which is arranged at a distance from the base section (52) as seen in the longitudinal direction (62), characterized in that the screen section (58) is altogether substantially planar, so that the filter section (54) has an altogether polygonal cross section.
- High-pressure fuel pump (10) having a pump casing (12), having an inlet (14) and having a fuel filter device (50) according to Claim 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017209293.9A DE102017209293A1 (en) | 2017-06-01 | 2017-06-01 | High-pressure fuel pump, as well as fuel filter device |
PCT/EP2018/059738 WO2018219548A1 (en) | 2017-06-01 | 2018-04-17 | High-pressure fuel pump and fuel filter device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3631189A1 EP3631189A1 (en) | 2020-04-08 |
EP3631189B1 true EP3631189B1 (en) | 2022-08-10 |
Family
ID=62027978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18719108.5A Active EP3631189B1 (en) | 2017-06-01 | 2018-04-17 | High-pressure fuel pump and fuel filter device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3631189B1 (en) |
DE (1) | DE102017209293A1 (en) |
ES (1) | ES2929775T3 (en) |
WO (1) | WO2018219548A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4131535A1 (en) * | 1991-09-21 | 1993-03-25 | Bosch Gmbh Robert | ELECTROMAGNETICALLY OPERATED INJECTION VALVE |
IT1319838B1 (en) * | 2000-02-15 | 2003-11-03 | Elasis Sistema Ricerca Fiat | IMPROVEMENT OF A SOLENOID VALVE FOR THE ADJUSTMENT OF THE PRESSURE OF FUEL SUPPLY TO A COMBUSTION ENGINE |
DE102013201897A1 (en) * | 2013-02-06 | 2014-08-07 | Robert Bosch Gmbh | Valve for metering fluid |
DE102014225319A1 (en) | 2014-12-09 | 2016-06-09 | Robert Bosch Gmbh | High-pressure fuel pump with a piston |
DE102015221308A1 (en) * | 2015-10-30 | 2017-05-04 | Robert Bosch Gmbh | High pressure pump for a fuel injection system |
-
2017
- 2017-06-01 DE DE102017209293.9A patent/DE102017209293A1/en active Pending
-
2018
- 2018-04-17 WO PCT/EP2018/059738 patent/WO2018219548A1/en active Application Filing
- 2018-04-17 ES ES18719108T patent/ES2929775T3/en active Active
- 2018-04-17 EP EP18719108.5A patent/EP3631189B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
ES2929775T3 (en) | 2022-12-01 |
DE102017209293A1 (en) | 2018-12-06 |
EP3631189A1 (en) | 2020-04-08 |
WO2018219548A1 (en) | 2018-12-06 |
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