EP1022461A2 - Hochdruckpumpe - Google Patents
Hochdruckpumpe Download PDFInfo
- Publication number
- EP1022461A2 EP1022461A2 EP00100848A EP00100848A EP1022461A2 EP 1022461 A2 EP1022461 A2 EP 1022461A2 EP 00100848 A EP00100848 A EP 00100848A EP 00100848 A EP00100848 A EP 00100848A EP 1022461 A2 EP1022461 A2 EP 1022461A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- support
- support piston
- pressure pump
- slide shoe
- 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
Links
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
- F04B1/0439—Supporting or guiding means for the pistons
Definitions
- the invention relates to a high pressure pump, in particular a radial piston pump according to the preamble of the claim 1.
- Radial piston pumps are used to generate high pressures, for example as a high-pressure fuel pump in common rail injection systems used. These pumps stand out due to low leakage and high volumetric efficiency from, the comparatively simple constructive Construction allows sealing gaps to be minimized the manufacturing tolerances required for the leak.
- the invention is based on the object to create a high pressure pump where the wear is reduced.
- the support piston - not as in the State of the art - on the eccentric ring but on the Supported shoe, so that there is no significant relative movement across the support piston axis in the contact area of the support piston can come. That is, the supporting force of the Support piston is placed on the eccentric ring via the sliding block transferred, the relative movement between the shoe and eccentric ring is irrelevant, because the sliding shoe with regard his choice of materials to an optimal one anyway Slidability and abrasion resistance is selected.
- the invention covers embodiments in which the Support piston directly or via an intermediate component is supported on the slide shoe.
- the support piston has a driving shoulder is designed to transmit the pull-out movement on the piston in contact with the holding device is feasible.
- This holding device is advantageously used as Holding disc designed with a hub-shaped middle section is placed on the piston and its peripheral portion for piston extension in contact with the support piston is feasible.
- the Support piston directly on the slide shoe.
- the support piston is via the holding disc or another holding device supported on the shoe.
- the holding disc with a large supporting force is applied, but must be a comparatively hard material used to form the retaining washer to minimize wear.
- the slide shoe is particularly easy to install, if he by means of a locking ring in a front Recording the support piston is fixed.
- the holding disc is preferably pressed onto the piston.
- the contact pressure of the slide shoe on the eccentric ring can be optimized especially at high speeds, by providing openings in the support piston, can be introduced into a pressure chamber via the pressure medium also preload the slide shoe hydraulically against the eccentric ring
- Figure 1 shows a rear view of a feed pump 1, such as for example in common rail fuel injection systems is used for internal combustion engines.
- a feed pump such as for example in common rail fuel injection systems is used for internal combustion engines.
- a high pressure pump to pressurize the fuel with Pressures of up to 2000 bar are usually radial piston pumps used in which several pump units, for example three pump units 2a, 2b, 2c in one pump housing 4 are included.
- FIG 2 shows a partial representation of a section by the radial piston pump according to Figure 1 along the line A-A. Accordingly, each pump unit 2 has a displacer housing 6 with a cylinder head 8 and one in the radial direction extending inwards, radially with respect to the cylinder head 8 reset cylinder 10, which in the pump housing 4 dips.
- a piston 12 is guided in the displacer housing 6 rests on an eccentric ring 16 via a slide shoe 14.
- the bearing surface of the eccentric ring 16 is by a Flattening formed, which in accordance with the representation Figure 2 extends perpendicular to the plane of the drawing.
- the eccentric ring 16 is on a sliding bush 18 an eccentric 20 of a drive shaft 22, which in turn is guided over slide bearings in the pump housing 4.
- a suction channel 28 In the cylinder head is a suction channel 28 with a suction valve 30 arranged via which the pressure medium (fuel) is feedable.
- a pressure channel 32 in the cylinder head 8 On the pressure side there is a pressure channel 32 in the cylinder head 8 provided, which leads to a pressure valve 34, that in the parting plane between the cylinder head 8 and one Mounting flange of the pump housing 4 is arranged.
- the output of the pressure valve 34 is via a pump housing side Pressure channel 36 with a not shown Bus line connected via which the three pumping units 2a, 2b, 2c delivered pressure medium (fuel) one Consumer, in the present case a common rail can be supplied is.
- the suction connection of the pump is via a pump housing Suction channel 38 with the inlet of the suction valve 30 connected.
- the pressure valve 34 and the suction valve 30 are both as spring-loaded seat valves, especially as Check valves executed.
- the piston 12 is connected to the support piston via a holding disc 24 connected so that an extension movement of the support piston 24 to the axis 42 of the drive shaft 22 towards the introduction a suction stroke is transferred to the piston 12.
- Cylinder 10 has a cylinder bore 46 in which the Piston 12 is guided.
- the cylinder bore 46 is in the mouth area extends radially so that an annular space 48 is formed is that of the piston 12, the shoe 14 and the Support piston 24 is limited.
- the holding disc 40 has a hub-shaped projection 50, with which they on the lower end in Figure 3 the piston 12 is pressed.
- the Holding disc 40 formed from a soft material his.
- the hub-shaped projection 50 dips into the annular space 48 a.
- the lower end face in FIG. 3 of the holding disc is approximately aligned with the adjacent end face of the piston 12, so that this and the retaining washer 40 flat on the Put on the slide shoe.
- Support piston 24 has a radially widened end portion 52, in the end face of which is a receptacle 54 for the slide shoe 14 is trained.
- the axial length of the receptacle 54 is included chosen so that the end face of the shoe 14 over the adjacent end face of the support piston 24 protrudes, so that the latter has no contact with the eccentric ring 16 (see Figure 2) has.
- An outer peripheral region 56 of the holding disk 40 extends itself into the receptacle 54 so that the support piston 24 with an annular end face 58 on the holding disc 40 and this in turn rests on the slide shoe 14. That is, the embodiment shown on the left is based the support piston 24 on the drive plate 40 on the Slide shoe 14 off. This is over one in an annular groove the receptacle 54 received circlip 60 in the axial direction secured to one shoulder of the shoe 14 is present. This shoulder is downgraded by the end support surface 62 of the slide shoe 14, so that the bearing surface of the slide shoe 62 is somewhat reduced becomes. However, this is accepted because the Assembly of the slide shoe 14 by inserting the fastening ring 60 is significantly simplified.
- Breakthroughs 64, 66 formed through the lower Outer peripheral edge 68 of the cylinder 10 in succession can be controlled or controlled.
- the openings 64, 66 open in the area of the spring chamber of the support piston 24, which with Pressure medium (for example fuel) is filled. That is, through the openings opened over the peripheral edge 68 64 or 66 pressure medium can enter the annular space 48 and the holding disk 40 and the slide shoe 14 in the direction preload on eccentric ring 16.
- Pressure medium for example fuel
- the piston 12 is in the position shown at its top dead center where the maximum pressurization of the pressure medium takes place. According to Figure 3 is then the breakthrough 66 fully controlled during the Breakthrough 68 is not fully controlled. In the Movement of the support piston 24 successively the breakthroughs 64, 66 open or closed, so that it depends on the relative arrangement and geometry of the openings 64, 66 in the annular space 48 from the stroke of the control piston 24 can generate dependent pressure over which the holding disc 40 and the slide shoe 14 in addition to the power of Compression spring 26 is pressed onto the eccentric ring 16. Regarding the exact functioning of this hydraulic Pressure of the slide shoe 14 on the eccentric ring 16 is on DE 197 27 247 mentioned in the introduction to the description A1, the content of which refers to the content of the present application is to be counted.
- FIG. 3 shows an improved one to the right of the central axis 44 Embodiment, which differs essentially from the above Embodiment differs in that the Support piston 24 not directly over the holding disc 40 but directly is supported on the slide shoe 14.
- the support piston 24 has one Radial shoulder 70, the outer periphery of the retaining plate 40th engages and rests on the slide shoe 62.
- the holding disc 40 associated ring end face 58 is designed such that they have a minimal gap to the retaining washer 40 stands, so that practically no support force on the holding disc 40 is introduced into the slide shoe 14.
- the invention is not limited to the two limited embodiments described above, at which the supporting force either via the holding disc 40 or is introduced directly into the slide shoe 14.
- the support piston 24 it is also conceivable for the support piston 24 to have its own Support ring on the shoe 14 so that the structure of the support piston 24 is simplified since none Radial gradation for receiving the holding disk 40 is provided must become.
- a high-pressure pump in particular one, Radial piston pump with at least one pump unit, the Piston over a sliding block on an eccentric ring Drive shaft is supported.
- a support piston is arranged in the pump unit, which is biased against the eccentric ring by a compression spring is.
- the axial movement of the support piston is via a retaining washer transferred to the piston of the pump unit.
- the support piston lies directly or over the drive plate or otherwise on the slide shoe.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims (8)
- Hochdruckpumpe, insbesondere Radialkolbenpumpe mit zumindest einer von einer Antriebswelle (22) angetriebenen Pumpeinheit (2), mit einem Verdrängergehäuse (6), in dem ein Kolben (12) axialverschiebbar geführt ist, der mit einem Gleitschuh (14) an einem Exzenterring (16) anliegt, der über einen den Kolben (12) zumindest abschnittsweise im Abstand umgreifenden, im Verdrängergehäuse (6) geführten und in eine Anlageposition vorgespannten Stützkolben (24) abgestützt ist, wobei die Auszugsbewegung des Stützkolbens (24) über eine Halteeinrichtung (40) auf den Kolben (12) übertragbar ist, dadurch gekennzeichnet, daß der Stützkolben (12) mittelbar oder direkt gegen den Gleitschuh (14) vorgespannt ist.
- Hochdruckpumpe nach Patentanspruch 1, dadurch gekennzeichnet, daß der Stützkolben (24) eine Mitnahmeschulter (58) hat, die zur Übertragung der Auszugsbewegung in Anlage an die Halteeinrichtung (40) bringbar ist.
- Hochdruckpumpe nach Patentanspruch 1 oder 2, dadurch gekennzeichnet, daß die Halteeinrichtung eine Haltescheibe (40) ist, die mit einem nabenförmigen Abschnitt (50) mit dem Kolben (12) verbunden ist und deren Umfangsabschnitt (56) zum Kolbenauszug in Anlage an dem Stützkolben (24) steht.
- Hochdruckpumpe nach Patentanspruch 3, dadurch gekennzeichnet, daß der Stützkolben (24) über die Haltescheibe (40) auf dem Gleitschuh (14) abgestützt ist.
- Hochdruckpumpe nach Patentanspruch 2, dadurch gekennzeichnet, daß der Stützkolben (24) im Anlagebereich an den Gleitschuh (14) eine Radialstufe hat, in die ein Umfangsabschnitt (56) der Haltescheibe (40) eintaucht.
- Hochdruckpumpe nach einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß der Stützkolben (24) eine Aufnahme (54) zur stirnseitigen Abstützung des Gleitschuhs (14) hat, wobei in einer Ringnut in der Umfangswandung der Aufnahme (54) ein Befestigungsring (60) zur Axialfestlegung des Gleitschuhs (14) angeordnet ist.
- Hochdruckpumpe nach einem der Patentansprüche 3 bis 6, dadurch gekennzeichnet, daß die Haltescheibe (40) auf den Kolben (12) aufgepreßt ist.
- Hochdruckpumpe nach einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß in der Wandung des Stützkolbens (24) zumindest ein Durchbruch (64, 66) vorgesehen ist, der während der Axialbewegung des Stützkolbens (24) aufsteuerbar ist, so daß Druckmittel in einen an den Gleitschuh (24) angrenzenden Druckraum (48) einleitbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19902324 | 1999-01-21 | ||
DE19902324A DE19902324A1 (de) | 1999-01-21 | 1999-01-21 | Hochdruckpumpe |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1022461A2 true EP1022461A2 (de) | 2000-07-26 |
EP1022461A3 EP1022461A3 (de) | 2001-01-03 |
EP1022461B1 EP1022461B1 (de) | 2004-10-06 |
Family
ID=7894979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00100848A Expired - Lifetime EP1022461B1 (de) | 1999-01-21 | 2000-01-17 | Hochdruckpumpe |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1022461B1 (de) |
DE (2) | DE19902324A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004061303A1 (de) * | 2003-01-07 | 2004-07-22 | Siemens Aktiengesellschaft | Radialkolbenpumpe |
WO2006048365A1 (de) * | 2004-11-04 | 2006-05-11 | Robert Bosch Gmbh | Hochdruckpumpe, insbesondere für eine kraftstoffeinspritzeinrichtung einer brennkraftmaschine |
DE102006042765A1 (de) * | 2006-09-12 | 2008-03-27 | Siemens Ag | Niederhalter für Hochdruckkolben, Anordnung und Verwendung |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19727294A1 (de) | 1997-06-27 | 1999-01-07 | Saarbergwerke Ag | Behälter für Fluide |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19507295B4 (de) * | 1995-03-02 | 2004-09-02 | Siemens Ag | Radialkolbenpumpe, insbesondere Kraftstoffpumpe für einen Verbrennungsmotor |
DE59706937D1 (de) * | 1996-07-01 | 2002-05-16 | Rexroth Mannesmann Gmbh | Vorrichtung zur Stabilisierung des Exzenterrings einer Radialkolbenpumpe |
JPH1030525A (ja) * | 1996-07-16 | 1998-02-03 | Denso Corp | 高圧サプライポンプ |
DE19943160A1 (de) * | 1998-09-10 | 2000-03-16 | Denso Corp | Kraftstoffeinspritzpumpe |
-
1999
- 1999-01-21 DE DE19902324A patent/DE19902324A1/de not_active Withdrawn
-
2000
- 2000-01-17 EP EP00100848A patent/EP1022461B1/de not_active Expired - Lifetime
- 2000-01-17 DE DE50008042T patent/DE50008042D1/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19727294A1 (de) | 1997-06-27 | 1999-01-07 | Saarbergwerke Ag | Behälter für Fluide |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004061303A1 (de) * | 2003-01-07 | 2004-07-22 | Siemens Aktiengesellschaft | Radialkolbenpumpe |
WO2006048365A1 (de) * | 2004-11-04 | 2006-05-11 | Robert Bosch Gmbh | Hochdruckpumpe, insbesondere für eine kraftstoffeinspritzeinrichtung einer brennkraftmaschine |
DE102006042765A1 (de) * | 2006-09-12 | 2008-03-27 | Siemens Ag | Niederhalter für Hochdruckkolben, Anordnung und Verwendung |
Also Published As
Publication number | Publication date |
---|---|
EP1022461B1 (de) | 2004-10-06 |
EP1022461A3 (de) | 2001-01-03 |
DE50008042D1 (de) | 2004-11-11 |
DE19902324A1 (de) | 2000-07-27 |
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