WO2005090783A1 - Pompe a piston radial - Google Patents

Pompe a piston radial Download PDF

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Publication number
WO2005090783A1
WO2005090783A1 PCT/EP2005/050176 EP2005050176W WO2005090783A1 WO 2005090783 A1 WO2005090783 A1 WO 2005090783A1 EP 2005050176 W EP2005050176 W EP 2005050176W WO 2005090783 A1 WO2005090783 A1 WO 2005090783A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
polygon ring
plate
pump according
radial
Prior art date
Application number
PCT/EP2005/050176
Other languages
German (de)
English (en)
Inventor
Siegfried Haberland
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2005090783A1 publication Critical patent/WO2005090783A1/fr

Links

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

Definitions

  • the invention relates to a radial piston pump for supplying high pressure fuel to a
  • Fuel injection system of an internal combustion engine preferably having a plurality of pump elements arranged radially with respect to a drive shaft mounted in a pump housing, the pump elements each having a piston which is actuated by a polygon ring mounted on an eccentric section of the drive shaft.
  • Such a radial piston pump is known for example from DE 102 21 305 AI.
  • the pistons of the pump elements are held by a piston spring in contact with the polygon ring of the drive shaft.
  • a so-called piston foot plate is provided at the end of the piston, which faces the drive shaft, which is firmly connected to the piston. The piston spring is clamped between the pump housing and the piston footplate.
  • a disadvantage of this concept is that the spring rate and preload force of the piston spring have to be increased with increasing maximum speed of the radial piston pump.
  • the space required for the piston spring increases and the mechanical load on the radial piston pump, in particular the piston foot, the polygon ring and the drive shaft increases.
  • a large contact pressure between the piston footplate and the polygon ring increases the friction and thus the drive power requirement.
  • the formation of a stable lubricating film made of fuel between the polygon ring and the piston base plate becomes more difficult.
  • Fuel injection system of an internal combustion engine preferably with a plurality of pump elements arranged radially with respect to a drive shaft mounted in a pump housing, the pump elements each having a piston which is actuated by a polygon ring mounted on an eccentric section of the drive shaft, provided in accordance with the invention that the piston or pistons form-fit are coupled to the polygon ring.
  • the piston spring can be dispensed with entirely. This also eliminates all of the disadvantages mentioned above.
  • Radial piston pump can be reached. With the same injection quantity, this in turn leads to the pump elements of the radial piston pump being able to be made smaller, thus reducing the manufacturing costs and space requirements for the radial piston pump.
  • the elimination of the piston springs also means that the piston can be better guided in the pump housing, which improves the service life of the pump elements and improves the volumetric efficiency of the radial piston pump.
  • Radial piston pump is provided that there is a flat for each piston on the polygon ring that the
  • Polygon ring has at least one groove per piston, that the at least one groove per piston runs parallel to the flattened portion, and that each piston has a piston plate that forms a positive connection with the at least one groove.
  • the piston plate and the piston are made in one piece, which enables a particularly compact and cost-effective design. Because the piston plate and the piston are made in one piece and the piston is guided very well in the pump housing, tilting of the piston plate relative to the polygon ring or to the flats of the polygon ring can be effectively prevented.
  • a flattening is provided for each piston on the polygon ring, the polygon ring having at least one groove per piston, which runs parallel to the flattening, and is a tappet with a on each piston Tappet plate arranged, which forms a positive connection with the at least one groove.
  • the piston and the plunger can each be manufactured individually, which simplifies their processing.
  • a washer is attached to at least one end face of the polygon ring with a shoulder per flattening of the polygon ring and the shoulder and the flattening form a groove , Due to the multi-part construction of the polygon ring, the groove can be produced particularly inexpensively.
  • it is particularly simple to provide a groove on each of the two end faces of the polygon ring, so that the piston plate or the plunger plate is positively connected to the polygon ring on both sides. This almost completely eliminates tilting moments and at least doubles the resilience of the positive connection between the piston and the drive shaft.
  • the at least one disk on the polygon ring can be fastened in a rotationally fixed manner to the polygon ring by one or more beads, so that the geometry of the groove among all Load conditions of the radial piston pump always remain the same and thus the piston plate or the plunger plate can always move in the groove or grooves with the required ease of movement.
  • the contact area between the piston plate or the plunger plate on the one hand and the groove in the polygon ring on the other hand can be increased with otherwise the same dimensions if the piston plate or the plunger plate is designed as a square or square. This further reduces the risk of the polygon ring tipping relative to the pistons and the surface load between the piston plate and the groove in the polygon ring decreases, which increases the service life of the radial piston pump according to the invention.
  • At least one guide surface can be formed on the piston plate or on the plunger plate, which together with the groove or the shoulder of the polygon ring ensures that the piston or the plunger is secured against rotation.
  • the service life of the radial piston pump according to the invention is significantly improved if the piston is guided in the pump housing in the area of the piston plate.
  • the tappet is guided in the pump housing in the region of the piston plate, since in this embodiment the guidance of the tappet in the pump housing ensures that no transverse forces can act on the pistons of the pump element.
  • FIG. 1 shows a longitudinal section through a radial piston pump according to the prior art
  • FIG. 2 shows a cross section through a radial piston pump according to the prior art
  • FIG. 3 shows a first exemplary embodiment of a positive connection according to the invention between piston and polygon ring in cross section
  • FIG. 4 shows the first exemplary embodiment in longitudinal section
  • FIG. 5 shows a plan view of a second exemplary embodiment of a piston according to the invention and a polygon ring according to the invention
  • FIG. 6 shows a third exemplary embodiment of a positive connection according to the invention
  • FIG. 7 shows a fourth exemplary embodiment according to the invention of a positive connection according to the invention.
  • Figure 8 shows another embodiment with a plunger between the piston and polygon ring.
  • FIG. 1 shows a radial piston pump according to the prior art in longitudinal section.
  • the radial piston pump consists of a pump housing 1, in which a drive shaft 3 is rotatably mounted.
  • the drive shaft 3 has an eccentric section 5.
  • the eccentric section 5 drives three pump elements 9 evenly distributed over the circumference via a polygon ring 7.
  • Each pump element 9 has a piston 11 which is guided in a cylinder bore 13 and delimits a delivery chamber 15.
  • a suction side 19 and a high-pressure side 21 are present in a cylinder head 17 of the pump elements 9.
  • the suction side 19 of the cylinder head 17 is a Low pressure bore 23 in the pump housing 1 is supplied with fuel.
  • a first check valve 25 is arranged on the suction side 19 and prevents the backflow of fuel (not shown) from the delivery chamber 15 into the low-pressure bore 23.
  • the high-pressure side 21 of the pump element 9 opens into a high-pressure duct 27 in the pump housing 1.
  • a second check valve 29 is provided on the high-pressure side 21 of the pump element, which prevents the backflow of fuel under high pressure from the high-pressure duct 27 into the delivery chamber 15.
  • the pump elements 9 are screwed to the pump housing 1 by means of screws, not shown, and are pressed by the screw connection onto a cylinder foot surface 31 of the pump housing.
  • the eccentric section 5 together with the polygon ring 7 causes the pistons 11 to oscillate in the cylinder bores 15 and thus suck fuel from the suction side 19 and to the high pressure side 21 promote.
  • a piston footplate 33 which is firmly connected to the pistons 11, is pressed against the polygon ring 7 by a compression spring 35.
  • Compression spring 35 limits the maximum operating speed of the radial piston pump known from the prior art.
  • FIG. 3 shows a first exemplary embodiment of a positive connection according to the invention between the piston 11 and the polygon ring 7 in cross section.
  • Figure 4 shows the same embodiment in longitudinal section.
  • the cylinder bore 13 is designed as a stepped bore.
  • the piston 11 is as
  • Step piston executed and dimensioned so that the two
  • the piston 11 At the end of the piston 11 facing the polygon ring 7, the piston 11 has a piston plate 39.
  • the piston plate 39 On its side facing the polygon ring 7, the piston plate 39 is spherical, that is to say slightly curved, as shown in FIG. 3 by the dash-dotted line 41, which is greatly exaggerated.
  • the piston plate 39 is guided in the groove 43. This means that in the direction of the longitudinal axis (not shown) of the
  • Piston 11 a positive connection between the piston 11 and polygon ring 7 is made with the help of the piston plate 39 of the piston 11 and the groove 33 of the polygon ring 7.
  • the piston plate 39 can be displaced in the groove 43 perpendicular to the longitudinal axis of the piston 11, as is indicated in FIG. 3 by a double arrow 39. This displaceability perpendicular to the longitudinal axis of the piston 11 is necessary so that the polygon ring 7 can execute the eccentric movement impressed by the eccentric section 5 of the drive shaft 3.
  • an equalizing bore 53 is provided. Due to the excellent guidance of the piston 11 designed as a stepped piston in the housing 1, it is possible for the piston 11 to be held on only one side by a groove 43 of the polygon ring. It is of course also possible for a groove 43 (not shown in FIG. 4) to be present on both sides of the piston. Of course, the mountability of the radial piston pump according to the invention must then be taken into account.
  • the positive connection between the piston 11 and the polygon ring 7 according to the invention allows the permissible operating speed of a radial piston pump according to the invention to be increased.
  • the diameter of the pistons 11 can be reduced with the same delivery rate, which has an advantageous effect on the installation space requirement and the volumetric efficiency of the radial piston pump according to the invention.
  • FIG. 5 shows a top view of a piston, also designed as a stepped piston, and a polygon ring 7 according to the invention with a groove 43.
  • the piston plate 39 is square. This results in a larger contact area between the piston foot 39 and the groove 43 of the polygon ring 7. As a result, the load capacity of the positive connection according to the invention between the piston 11 and the polygon ring 7 is further increased.
  • the square design of the piston plate 39 has the further advantage that the piston 11 cannot rotate about its longitudinal axis.
  • the second embodiment variant of an interlocking connection according to the invention shown in FIG. 5 thus simultaneously includes a rotation lock of the piston 11.
  • piston plates 39 or piston plates 39 with only one flattening in the area of groove 43 also not shown also have the advantages mentioned above as a double-edged (not shown).
  • FIG. 6 shows a third exemplary embodiment of a positive connection according to the invention between a piston 11, which is also designed as a stepped piston, and the polygon ring 7.
  • the piston plate 39 is circular and a guide surface 55 is provided on the piston 11, which together with the shoulder 47 of the polygon ring 7 causes the piston 11 to be secured against rotation about its longitudinal axis.
  • FIG. 7 shows a fourth exemplary embodiment of a positive connection according to the invention between a piston 1 and the polygon ring 7 in a longitudinal section.
  • a disk 57 is provided on each end of the polygon ring 7, which has a shoulder 47.
  • This shoulder 47 can be produced, for example, by bending the disk 57.
  • the shoulders 47 of the disks 57 together with a flat 37 of the polygon ring 7 each form a groove 43, in which the piston plate 39 in the manner previously described is positively guided.
  • the piston 11 is thus positively connected to the polygon ring 7 on both sides.
  • the disks 57 are connected to the polygon ring 7 in a rotationally fixed manner, for example with the aid of beads (not shown) or by pressing the disks 57 with the polygon ring 7 (not shown).
  • a relatively good assemblability is ensured despite the positive connection of the piston 11 and the polygon ring 7 on both sides. Because the piston 11 is positively connected to the polygon ring 7 on both sides, increased forces in the axial direction of the piston 11 can be transmitted between the polygon ring 7 and the piston 11.
  • FIG. 8 shows a further exemplary embodiment of a positive connection according to the invention between the piston 11 and the polygon ring 7.
  • the piston 11 is not directly connected to the polygon ring 7 in a form-fitting manner, but a plunger 59 is provided, which has a plunger plate 61 at its end facing the polygon ring 7.
  • Ram plate 61 is positively connected to the polygon ring 7 in the manner already described with the aid of a groove 43.
  • the plunger 59 has a blind hole 63 into which the piston 11 projects. Some clearance is provided between the blind hole 63 and the piston 11 so that any misalignment can be compensated for and the plunger plate 61 always lies flat on the flat 37 of the polygon ring.
  • the piston 11 can be pinned to the plunger 59 by a pin 65, for example, and thus be positively connected. Alternatively, the piston 11 can also be positively connected to the plunger 69 with the aid of a spring ring 67.
  • a second groove 69 is provided in the piston 11 and a third groove 71 is provided in the blind hole 63 of the plunger 59.
  • the side of the piston plate 39 or the plunger plate 61 facing the flattening 37 can be spherical, as has already been explained in connection with FIG. 3.
  • the cylinder bore 13 is also designed as a stepped bore.
  • the plunger 59 is guided in a shoulder 13b of the stepped bore 13, so that no transverse forces act on the piston 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe à piston radial. Le piston (11) des éléments pompe (9) est relié par liaison de forme à une bague polygonale (7) qui est montée rotative par une section excentrique (7) sur un arbre menant (3). On obtient ainsi une construction simple et des vitesses de régime admissible élevées.
PCT/EP2005/050176 2004-03-18 2005-01-17 Pompe a piston radial WO2005090783A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004013245.3 2004-03-18
DE200410013245 DE102004013245A1 (de) 2004-03-18 2004-03-18 Radialkolbenpumpe

Publications (1)

Publication Number Publication Date
WO2005090783A1 true WO2005090783A1 (fr) 2005-09-29

Family

ID=34960231

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/050176 WO2005090783A1 (fr) 2004-03-18 2005-01-17 Pompe a piston radial

Country Status (2)

Country Link
DE (1) DE102004013245A1 (fr)
WO (1) WO2005090783A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2540548A (en) * 2015-07-20 2017-01-25 Delphi Int Operations Luxembourg Sarl Novel pump design

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006043187B3 (de) * 2006-09-14 2008-04-03 Siemens Ag Fluidpumpe, insbesondere Hochdruck-Kraftstoffpumpe für Einspritzsysteme von Brennkraftmaschinen

Citations (6)

* Cited by examiner, † Cited by third party
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
US2324291A (en) * 1942-06-15 1943-07-13 Hydraulie Controls Inc Pump
FR2174365A5 (fr) * 1972-03-01 1973-10-12 Ferodo Sa
GB2351780A (en) * 1998-04-09 2001-01-10 Bosch Gmbh Robert Radial piston pump for use in a common rail fuel injection system for internal combustion engines
WO2003058064A1 (fr) * 2002-01-11 2003-07-17 Robert Bosch Gmbh Pompe a carburant destinee a un moteur a combustion interne
DE10236853A1 (de) * 2002-08-10 2004-02-26 Continental Teves Ag & Co. Ohg Radialkolbenpumpe, insbesondere für eine schlupfgeregelte Bremsanlage

Patent Citations (6)

* Cited by examiner, † Cited by third party
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
US2324291A (en) * 1942-06-15 1943-07-13 Hydraulie Controls Inc Pump
FR2174365A5 (fr) * 1972-03-01 1973-10-12 Ferodo Sa
GB2351780A (en) * 1998-04-09 2001-01-10 Bosch Gmbh Robert Radial piston pump for use in a common rail fuel injection system for internal combustion engines
WO2003058064A1 (fr) * 2002-01-11 2003-07-17 Robert Bosch Gmbh Pompe a carburant destinee a un moteur a combustion interne
DE10236853A1 (de) * 2002-08-10 2004-02-26 Continental Teves Ag & Co. Ohg Radialkolbenpumpe, insbesondere für eine schlupfgeregelte Bremsanlage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2540548A (en) * 2015-07-20 2017-01-25 Delphi Int Operations Luxembourg Sarl Novel pump design

Also Published As

Publication number Publication date
DE102004013245A1 (de) 2005-10-06

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