EP2235368B1 - Pump, particularly high-pressure fuel pump - Google Patents
Pump, particularly high-pressure fuel pump Download PDFInfo
- Publication number
- EP2235368B1 EP2235368B1 EP08860875A EP08860875A EP2235368B1 EP 2235368 B1 EP2235368 B1 EP 2235368B1 EP 08860875 A EP08860875 A EP 08860875A EP 08860875 A EP08860875 A EP 08860875A EP 2235368 B1 EP2235368 B1 EP 2235368B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive shaft
- pump
- rotation
- piston
- axis
- 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.)
- Not-in-force
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- 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
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
-
- 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
- F04B1/0408—Pistons
Definitions
- the invention relates to a pump, in particular high-pressure fuel pump according to the preamble of claim 1.
- Such a pump is through the US 1 964 245 A known.
- This pump has a drive shaft with an eccentric to its axis of rotation formed portion on which a ring is rotatably mounted.
- the pump has at least one pump piston which is supported directly via its piston base or via a support element on the ring and is driven in a stroke movement during the rotation of the drive shaft.
- the ring has in the region of the system of the piston foot or the support element on at least approximately flat support surface.
- the support surface of the piston foot or of the support element on the ring is larger than the cross-sectional area of the shaft of the pump piston.
- the support surface of the piston foot or of the support element is usually circular and should be as large as possible to avoid tilting movements of the ring relative to the piston foot or support element.
- the extension of the support surface of the piston foot or of the support element in the tangential direction to the axis of rotation of the drive shaft is greater than the extent thereof in the direction of the axis of rotation of the drive shaft.
- it can lead to tilting of the ring.
- this tilting can lead to damage to the ring and / or the pump piston or support element at high speeds of the drive shaft.
- the pump should have a compact design as possible, the placement of a piston foot or support element with a large support surface, in particular in the direction of the axis of rotation of the drive shaft, difficult.
- the pump according to the invention with the features of claim 1 has the advantage that tilting of the ring can be effectively prevented by the formation of the support surface of the piston foot or the support member.
- FIG. 1 a pump in a longitudinal section
- FIG. 2 an enlarged section of the pump in a cross section along line II-II in FIG. 1 according to a first embodiment
- FIG. 3 the pump in a section along line III-III in FIG. 2
- FIG. 4 a section of the pump in section along line IV-IV in FIG. 2
- FIG. 5 the pump according to a second embodiment
- FIG. 6 the pump according to a third embodiment.
- a pump which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine.
- the pump has a housing 10, which may be designed in several parts and in which a rotationally driven drive shaft 12 is arranged.
- the drive shaft 12 is in the housing 10 via two spaced apart in the direction of the axis of rotation 13 of the drive shaft 12 bearings 14th and 15 rotatably mounted.
- the bearings 14,15 can be arranged in different parts of the housing 10.
- the direction of rotation of the drive shaft 12 is illustrated by an arrow 17.
- the drive shaft 12 In a region lying between the two bearing points 14,15 the drive shaft 12 has an eccentric to its axis of rotation 13 formed portion 20 which has a cylindrical shape and on which a ring 22 is rotatably mounted.
- one or more pump elements 24 are provided, each having a pump piston 26 which is at least indirectly driven by the portion 20 of the drive shaft 12 and the ring 22 mounted thereon in a lifting movement.
- the pump has two pump elements 24, these are for example as in FIG. 1 represented diametrically opposite each other, that is arranged to rotate 180 ° about the axis of rotation 13 of the drive shaft 12 to each other. If the pump has three pump elements 24, then these are arranged, for example, rotated by 120 ° about the axis of rotation 13 of the drive shaft 12 to each other.
- the pump piston 26 is slidably guided in each case in a cylinder bore 28 of a housing part of the pump and limited with its the drive shaft 12 facing away from a pump chamber 30.
- suction stroke of the pump piston 26 sucks this via an inlet valve 32 fuel from an inlet in the pump working space 30 at.
- delivery stroke of the pump piston 26 compresses the fuel in the pump chamber 30 and displaces fuel via an outlet valve 34 into an outlet, which leads, for example, to a high-pressure accumulator.
- the return movement of the pump piston 26 during its suction stroke is effected by a return spring 36.
- the ring 22 has, for each pump piston 26, an at least approximately planar contact surface 40 on which the pump piston 26 is supported directly with its piston foot 42 or via a support element 54 or 64.
- FIG. 2 the pump is shown according to a first embodiment, in which the pump piston 26 directly with his piston 42 on the foot Bearing surface 40 of the ring 22 is supported.
- the support surface 46 of the piston foot 42 is larger than the cross-sectional area of the shaft of the pump piston 26, which is arranged in the cylinder bore 28.
- the return spring 36 is clamped between the piston 42 and a housing part of the pump.
- the support surface 46 is at least approximately flat and has as in FIG. 3 shown in the tangential direction with respect to the axis of rotation 13 of the drive shaft 12 a greater extent than in the direction of the axis of rotation 13.
- the extension of the support surface 46 in the tangential direction is denoted by a and their extension in the direction of the axis of rotation 13 is denoted by b.
- the support surface 46 as in the Figures 2 and 3 represented in the tangential direction with respect to the rotational axis 13 of the drive shaft 12, starting from the longitudinal axis 27 of the pump piston 26 against the direction of rotation 17 of the drive shaft 12 a greater extent than in the direction of rotation 17 of the drive shaft 12.
- the extension of the support surface 46 against the direction of rotation 17 is c designated and whose extension in the direction of rotation 17 is designated d.
- the pump piston 26 is arranged such that its longitudinal axis 27 does not intersect the axis of rotation 13 of the drive shaft 12 but extends offset in the direction of rotation 17 of the drive shaft 12 with respect to the axis of rotation 13.
- the longitudinal axis 27 of the pump piston 26 thus extends in the area of the support surface 46 offset by a dimension f with respect to a rotation axis 13 of the drive shaft 12 containing radial plane 48 in the direction of rotation 17.
- the support surface 46 is preferably formed such that viewed in the tangential direction with respect to the axis of rotation 13 of the drive shaft 12 whose center M is at least approximately in the radial plane 48, as in the Figures 2 and 3 is shown. With respect to the longitudinal axis 27 of the pump piston 26, the support surface 46 is thus formed asymmetrically, since this counter to the direction of rotation 17 has the greater extent c and in the direction of rotation 17, the smaller extension d. With regard to the radial plane 48, however, the support surface 46 is formed symmetrically with its center M in the radial plane 48.
- the support surface 46 is for example as in FIG. 3 shown formed rounded at their pointing in the tangential direction to the axis of rotation 13 of the drive shaft 12 edges and formed at their pointing in the direction of the axis of rotation 13 edges at least approximately flat.
- the pump is shown in sections according to a second embodiment, in which the basic structure is the same as in the first embodiment, the pump piston 26 but supported by a plate-shaped support member 54 on the contact surface 40 of the ring 22.
- the support element 54 is connected to the piston foot 42 of the pump piston 26, which has a relative to the shaft of the pump piston 26 enlarged cross-sectional area, but has a smaller cross-sectional area than in the first embodiment.
- the support member 54 has on its side facing away from the ring 22 a recess 55 into which the piston 42 is inserted.
- the connection between the piston foot 42 and the support member 54 may be rigid or articulated.
- connection of the piston foot 42 with the support element 54 can take place, for example, by means of a clamp-like fastening element 58 which engages over the piston foot 42 and the support element 54.
- the support surface 56 of the support member 54, with this comes to rest on the contact surface 40 on the ring 22 is the same design as the support surface 46 of the piston 42 in accordance with the first embodiment.
- the pump is shown in sections according to a third embodiment, in which the basic structure is again the same as in the first embodiment, the pump piston 26 but supported by a support member 64 on the contact surface 40 of the ring 22.
- the support member 64 is arranged as an insert in a plunger 68, which in is formed substantially hollow cylindrical.
- the plunger 68 is slidably guided over its outer circumference in a bore of a housing part of the pump or over its inner circumference on a cylindrical projection of a housing part of the pump.
- the pump piston 26 protrudes into the plunger 68 and rests with its piston foot 42 on the side facing away from the ring 22 of the support member 64.
- the return spring 36 is supported on a spring plate 70 which abuts on the piston foot 42 as well as on a projection 72 projecting radially inward on the plunger 68 and thus acts on both the plunger 68 and the pump piston 26 and via this the support element 64 to the ring 22 out.
- the support member 64 has a ring 22 facing and abutting the abutment surface 40 support surface 66 which is formed the same as the support surface 46 of the piston 42 according to the first embodiment.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Die Erfindung geht aus von einer Pumpe, insbesondere Kraftstoffhochdruckpumpe nach der Gattung des Anspruchs 1.The invention relates to a pump, in particular high-pressure fuel pump according to the preamble of claim 1.
Eine solche Pumpe ist durch die
Die erfindungsgemäße Pumpe mit den Merkmalen gemäß Anspruch 1 hat den Vorteil, dass durch die Ausbildung der Abstützfläche des Kolbenfußes oder des Stützelements ein Verkippen des Rings wirksam verhindert werden kann.The pump according to the invention with the features of claim 1 has the advantage that tilting of the ring can be effectively prevented by the formation of the support surface of the piston foot or the support member.
In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Pumpe angegeben. Durch die Weiterbildung gemäß Anspruch 4 wird die Führung des Kolbenfußes bzw. Stützelements verbessert.In the dependent claims advantageous refinements and developments of the pump according to the invention are given. Through the development according to claim 4, the leadership of the piston foot or support element is improved.
Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen
In den
In einem zwischen den beiden Lagerstellen 14,15 liegenden Bereich weist die Antriebswelle 12 einen zu ihrer Drehachse 13 exzentrisch ausgebildeten Abschnitt 20 auf, der eine zylindrische Form aufweist und auf dem ein Ring 22 drehbar gelagert ist. Bei der Pumpe sind ein oder mehrere Pumpenelemente 24 vorgesehen, die jeweils einen Pumpenkolben 26 aufweisen, der zumindest mittelbar durch den Abschnitt 20 der Antriebswelle 12 und den darauf gelagerten Ring 22 in einer Hubbewegung angetrieben wird.In a region lying between the two
Wenn die Pumpe zwei Pumpenelemente 24 aufweist, so sind diese beispielsweise wie in
Der Pumpenkolben 26 ist jeweils in einer Zylinderbohrung 28 eines Gehäuseteils der Pumpe verschiebbar dicht geführt und begrenzt mit seiner der Antriebswelle 12 abgewandten Stirnseite einen Pumpenarbeitsraum 30. Beim nach innen zur Antriebswelle 12 gerichteten Saughub des Pumpenkolbens 26 saugt dieser über ein Einlassventil 32 Kraftstoff aus einem Zulauf in den Pumpenarbeitsraum 30 an. Beim nach außen von der Antriebswelle 12 weg gerichteten Förderhub verdichtet der Pumpenkolben 26 den Kraftstoff im Pumpenarbeitsraum 30 und verdrängt Kraftstoff über ein Auslassventil 34 in einen Auslass, der beispielsweise zu einem Hochdruckspeicher führt. Die Rückbewegung des Pumpenkolbens 26 bei dessen Saughub wird durch eine Rückstellfeder 36 bewirkt. Der Ring 22 weist für jeden Pumpenkolben 26 eine zumindest annähernd ebene Anlagefläche 40 auf, an der sich der Pumpenkolben 26 direkt mit seinem Kolbenfuß 42 oder über ein Stützelement 54 bzw. 64 abstützt.The
In
Der Pumpenkolben 26 ist derart angeordnet, dass dessen Längsachse 27 die Drehachse 13 der Antriebswelle 12 nicht schneidet sondern bezüglich der Drehachse 13 in Drehrichtung 17 der Antriebswelle 12 versetzt verläuft. Die Längsachse 27 des Pumpenkolbens 26 verläuft somit im Bereich der Abstützfläche 46 um ein Maß f bezüglich einer die Drehachse 13 der Antriebswelle 12 enthaltenden Radialebene 48 in Drehrichtung 17 versetzt.The
Die Abstützfläche 46 ist vorzugsweise derart ausgebildet, dass in tangentialer Richtung bezüglich der Drehachse 13 der Antriebswelle 12 betrachtet deren Mitte M zumindest annähernd in der Radialebene 48 liegt, wie dies in den
Es kann vorgesehen sein, dass am Ring 22 wie in
Die Abstützfläche 46 ist beispielsweise wie in
In
In
Claims (4)
- Pump, in particular a high-pressure fuel pump, with a rotary-driven drive shaft (12) having a portion (20) which is eccentric to its axis of rotation (13) and on which a ring (22) is mounted rotatably, with at least one pump piston (26) which is supported directly via its piston foot (42) or via a supporting element (54; 64) on the ring (22) and is driven in a lifting movement during the rotational movement of the drive shaft (12), the ring (22) having an at least approximately planar bearing face (40) in the region of support of the piston foot (42) or of the supporting element (54; 64), and the supporting face (46; 56; 66) of the piston foot (42) or of the supporting element (54; 64) on the ring (22) being larger than the cross-sectional area of the shank of the pump piston (26), and the extent (a) of the supporting face (46; 56; 66) of the piston foot (42) or of the supporting element (54; 64) in the tangential direction to the axis of rotation (13) of the drive shaft (12) being greater than its extent (b) in the direction of the axis of rotation (13) of the drive shaft (12), characterized in that the extent (c) of the supporting face (46; 56; 66) of the piston foot (42) or of the supporting element (54; 64) in the tangential direction with respect to the axis of rotation (13) of the drive shaft (12), starting from the longitudinal axis (27) of the pump piston (26) opposite to the direction of rotation (17) of the drive shaft (12), is greater than its extent (d) in the direction of rotation (17) of the drive shaft (12).
- Pump according to Claim 1, characterized in that the at least one pump piston (26) is arranged in such a way that its longitudinal axis (27) runs so as to be offset with respect to the axis of rotation (13) of the drive shaft (12) in the direction of rotation (17) of the drive shaft (12).
- Pump according to Claim 1 or 2, characterized in that, in the tangential direction to the axis of rotation (13) of the drive shaft (12), the centre (M) of the supporting face (46; 56; 66) of the piston foot (42) or of the supporting element (54; 64) is arranged at least approximately in a radial plane (48) containing the axis of rotation (13) of the drive shaft (12).
- Pump according to one of the preceding claims, characterized in that the ring (22) has, next to the bearing face (40) in the direction of the axis of rotation (13) of the drive shaft (12), guide faces (50) which project with respect to the said bearing face and between which the piston foot (42) or the supporting element (54; 64) is guided essentially non-displaceably in the direction of the axis of rotation (13) of the drive shaft (12).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007060772A DE102007060772A1 (en) | 2007-12-17 | 2007-12-17 | Pump, in particular high-pressure fuel pump |
PCT/EP2008/065590 WO2009077274A1 (en) | 2007-12-17 | 2008-11-14 | Pump, particularly high-pressure fuel pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2235368A1 EP2235368A1 (en) | 2010-10-06 |
EP2235368B1 true EP2235368B1 (en) | 2011-08-10 |
Family
ID=40325755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08860875A Not-in-force EP2235368B1 (en) | 2007-12-17 | 2008-11-14 | Pump, particularly high-pressure fuel pump |
Country Status (7)
Country | Link |
---|---|
US (1) | US8522755B2 (en) |
EP (1) | EP2235368B1 (en) |
JP (1) | JP5044701B2 (en) |
CN (1) | CN101903654B (en) |
AT (1) | ATE519944T1 (en) |
DE (1) | DE102007060772A1 (en) |
WO (1) | WO2009077274A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5925458B2 (en) * | 2010-10-04 | 2016-05-25 | Juki株式会社 | Sewing machine oil pump |
DE102011002701A1 (en) * | 2011-01-14 | 2012-07-19 | Robert Bosch Gmbh | high pressure pump |
JP5633387B2 (en) * | 2011-01-24 | 2014-12-03 | 株式会社デンソー | Fuel supply pump |
EP2628942B1 (en) * | 2012-02-14 | 2014-10-01 | Continental Automotive GmbH | Pump and common rail fuel injection system |
DE102013211755A1 (en) * | 2013-06-21 | 2014-12-24 | Robert Bosch Gmbh | high pressure pump |
US20150136051A1 (en) * | 2013-11-15 | 2015-05-21 | Delphi Technologies, Inc. | Camshaft and follower geometry |
DE102014220746B3 (en) * | 2014-10-14 | 2016-02-11 | Continental Automotive Gmbh | Fuel pump |
CN105715473A (en) * | 2016-04-01 | 2016-06-29 | 郑州科技学院 | Multi-cylinder high-pressure radial plunger pump |
CN108571432A (en) * | 2018-06-22 | 2018-09-25 | 上海坤释流体科技有限公司 | A kind of corrosion-resistant eccentric wheel pump |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1964245A (en) | 1931-09-22 | 1934-06-26 | Hydraulic Press Mfg Co | Constant delivery radial piston pump |
US5382140A (en) * | 1993-02-11 | 1995-01-17 | Elasis Sistema Ricerca Fiat Nel Mezzogiorno | Radial-piston pump |
DE19814506A1 (en) * | 1998-04-01 | 1999-10-14 | Bosch Gmbh Robert | Radial piston pump for high-pressure fuel supply |
DE19816044C2 (en) * | 1998-04-09 | 2002-02-28 | Bosch Gmbh Robert | Radial piston pump for high-pressure fuel generation |
JP3891240B2 (en) * | 1998-11-05 | 2007-03-14 | 株式会社デンソー | Fuel injection pump |
DE10058050C1 (en) * | 2000-11-23 | 2002-03-21 | Ats Spartec Inc | Radial piston pump for fluid feed has piston shoes of radial pistons attached to support ring via retaining rails and blocked against rotation by spring-assisted pressure rings |
DE10150351A1 (en) * | 2001-10-15 | 2003-05-08 | Bosch Gmbh Robert | Pump element and piston pump for high-pressure fuel generation |
DE10256528A1 (en) | 2002-12-04 | 2004-06-24 | Robert Bosch Gmbh | High pressure pump for a fuel injector of an internal combustion engine |
DE20313014U1 (en) * | 2003-08-21 | 2004-12-23 | Robert Bosch Gmbh | High pressure pump for a fuel injector of an internal combustion engine |
DE102004023541A1 (en) * | 2004-05-13 | 2005-12-01 | Robert Bosch Gmbh | High-pressure pump for a fuel injection device of an internal combustion engine |
-
2007
- 2007-12-17 DE DE102007060772A patent/DE102007060772A1/en not_active Withdrawn
-
2008
- 2008-11-14 CN CN2008801212378A patent/CN101903654B/en not_active Expired - Fee Related
- 2008-11-14 WO PCT/EP2008/065590 patent/WO2009077274A1/en active Application Filing
- 2008-11-14 EP EP08860875A patent/EP2235368B1/en not_active Not-in-force
- 2008-11-14 JP JP2010538524A patent/JP5044701B2/en not_active Expired - Fee Related
- 2008-11-14 US US12/808,942 patent/US8522755B2/en not_active Expired - Fee Related
- 2008-11-14 AT AT08860875T patent/ATE519944T1/en active
Also Published As
Publication number | Publication date |
---|---|
US8522755B2 (en) | 2013-09-03 |
CN101903654B (en) | 2013-01-02 |
DE102007060772A1 (en) | 2009-06-18 |
CN101903654A (en) | 2010-12-01 |
EP2235368A1 (en) | 2010-10-06 |
US20100269795A1 (en) | 2010-10-28 |
JP5044701B2 (en) | 2012-10-10 |
JP2011506838A (en) | 2011-03-03 |
ATE519944T1 (en) | 2011-08-15 |
WO2009077274A1 (en) | 2009-06-25 |
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