WO2009049776A1 - Radial piston pump - Google Patents
Radial piston pump Download PDFInfo
- Publication number
- WO2009049776A1 WO2009049776A1 PCT/EP2008/008352 EP2008008352W WO2009049776A1 WO 2009049776 A1 WO2009049776 A1 WO 2009049776A1 EP 2008008352 W EP2008008352 W EP 2008008352W WO 2009049776 A1 WO2009049776 A1 WO 2009049776A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylinder block
- sleeve
- piston pump
- drive shaft
- radial piston
- Prior art date
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
- F04B1/0421—Cylinders
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B53/162—Adaptations of cylinders
- F04B53/166—Cylinder liners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0448—Steel
Definitions
- the invention relates to a radial piston pump according to the preamble of claim 1.
- Radial piston pumps of the type discussed here are known. They have a cylinder block, which surrounds a drive shaft and in which at least one piston arranged radially to this drive shaft is movable back and forth, which cooperates with a piston spring. The movement of the piston within the cylinder block is effected by means of an eccentric, which interacts with the drive shaft. The piston is moved radially outward by the drive shaft within the cylinder block against the force of the piston spring. It has been found that radial piston pumps of the type mentioned here, whose pistons are made of steel and whose cylinder block is made of nodular cast iron (for example of GGG60), are characterized by a relatively high weight.
- the object of the invention is therefore to provide a radial piston pump whose weight is reduced compared to conventional.
- a radial piston pump of the type mentioned here is created, which is characterized by the features mentioned in claim 1.
- the radial piston pump has a cylinder block of light metal, preferably made of aluminum or magnesium, which is significantly lighter than conventional cylinder blocks made of ductile iron.
- the at least one piston, which is movably mounted within the cylinder block, is guided in a sleeve of wear-resistant material, which is inserted into the cylinder block.
- the reciprocating within the sleeve piston is not in direct contact with the cylinder block, so it is not subject to increased wear even though it is made of aluminum.
- a preferred embodiment is characterized in that the sleeve is provided on its side facing the drive shaft with a collar, via which it is supported on the cylinder block. For a simple backup of the sleeve is created within the cylinder block.
- a preferred embodiment of the radial piston pump is characterized in that the collar of the sleeve is designed to be elastic. Characterized the force exerted by the sleeve on the cylinder block forces are resiliently intercepted, and preferably distributed over the entire collar surface.
- a preferred embodiment of the radial piston pump is characterized in that the sleeve has a closed bottom on its side facing away from the drive shaft.
- the radial piston pump is therefore relatively inexpensive to produce, because it can be dispensed with the realization of a conclusion of the sleeve receiving recess in the cylinder block.
- the sleeve has on its side facing away from the drive shaft an opening with a valve device.
- the sleeve is inserted from the inside into the cylinder block.
- the Pump is thus characterized by a particularly simple structure.
- the piston spring acts on the sleeve with a holding force.
- this has a collar, there is a particularly simple and secure mounting of the sleeve in the cylinder block.
- Figure 1 shows a schematic cross section through a first embodiment of a radial piston pump
- Figure 2 is a schematic cross section through a second
- Embodiment of a radial piston pump Embodiment of a radial piston pump.
- a radial piston pump 1 can be seen from the sectional illustration according to FIG. 1, which comprises a cylinder block 5 accommodated in a housing 3 in a rotationally fixed manner. This is annular. In the enclosed by him interior 7 a preferably sleeve-shaped eccentric 9 is housed, which is rotated by a drive shaft 11 in rotation, which rotates about its central axis 12.
- the cylinder block 5 is provided with at least one cylinder bore 13 which extends substantially radially to the drive shaft 1 1 and extends from the inner space 7 to an annular space 14 surrounding the cylinder block 5.
- six cylinder bores 13 arranged at the same distance from each other are provided.
- a hollow piston 15 is provided, of a accommodated in the interior of the piston 15 spring 17 is pressed against the outer surface of the eccentric 9.
- the eccentric 9 rotates about the central axis 12 of the drive shaft 11, so that the at least one piston 15 is pressed against the force of the spring 17 periodically to the outside.
- a bottom 21 of the piston 15 is pressed against the peripheral surface of the eccentric, so that upon rotation of the drive shaft 11, the piston 15 displaced outwardly from a radially outer region of the eccentric 9 and in a further rotation of the eccentric. 9 pressed inward by the spring 17.
- the peculiarity of the radial piston pump 1 is that in the cylinder bores 13 a also referred to as a piston cartridge sleeve 19 is introduced, so that the piston 15 does not directly contact the cylinder block 5 into contact, while a caused by the eccentric 9 during rotation of the drive shaft 11 Perform inward and outward movement.
- the length of the sleeve 19 substantially corresponds to the thickness of the annular cylinder block 5 measured in the radial direction.
- the radial piston pump 1 as I said, provided with six pistons which rest on the outside of the eccentric 9 and a different Ab- stand to the center of the radial piston pump 1 have:
- the piston located in Figure 1 above is in its maximum outwardly displaced position. He is so far as far inserted into the cylinder block 5.
- the spring 17 is compressed to the maximum.
- a fluid present in the interior of the hollow piston 15 is maximally compressed in this position and delivered to a pressure region of the radial piston pump 1.
- the sleeves 19 are cup-shaped and have a closed sleeve bottom 22.
- the sleeves 19 are formed as substantially cylindrical tubes, on their side facing the eccentric 9 and on their this opposite side are open.
- the cylinder bores 13 must be closed with plugs that can be pressed or screwed into the cylinder block 5, for example.
- the springs 17 are then based on the stopper, which close the cylinder bores 13 - seen in the radial direction - to the outside.
- the pumping action of the piston 15 is based on the fact that they are pressed by the eccentric 9 against the force of the spring 17 to the outside and are urged in a further rotation of the eccentric 9 by the spring 17 again in the direction of the drive shaft 11.
- the pistons 15 thus carry out a substantially radially extending inward and outward movement relative to the drive shaft 11.
- a fluid is sucked through holes 23 in the wall of the piston 15.
- the fluid is squeezed through openings 25 in the sleeves 19, wherein the openings 25 valves, here for example band valves are assigned, which are in a brought into the peripheral wall of the sleeve 19 groove.
- valves are realized by a circulating belt. It is also conceivable, instead of band valves on the sleeves 19, to provide other valves, for example check valves or seat valves, which flow in the flow direction of the fluid. down with respect to the openings 25 and the annular channel 27 may be provided.
- the spring 17 is compressed, which is supported on the one hand on the bottom 21 of the piston 15 and on the other hand on the sleeve bottom 22 of the sleeve 19 designed here in the shape of a cup.
- each piston 15 associated sleeve 19 This is made of a wear-resistant material, preferably made of thin-walled steel, which is preferably cured. It is inserted into the cylinder block 15, which consists of a light metal, preferably of aluminum or magnesium, due to the protective effect of the sleeves 19.
- the sleeves 19 may be pressed into the cylinder bores 13 in the cylinder block 5. In this case, the different thermal expansion factors of the cylinder block 5 and the sleeves 19 are taken into account. It is also conceivable to screw the sleeves 19 into the cylinder block 5. Since aluminum has a relatively low strength, it requires a correspondingly long thread and thus a relatively large radial space.
- the sleeves 19 are formed as substantially cylindrical tubes, additional plugs must be provided which close the cylinder bores 13 in the cylinder block 5 - seen in the radial direction - to the outside. These are preferably also out wear-resistant material, in a particularly preferred manner of the same material as the sleeves 19. They are fastened in a suitable manner in the cylinder block 5, preferably pressed or screwed.
- the stoppers are pressed in, in the same way as when the sleeves 19 are pressed in, the need arises to take into account the different coefficients of thermal expansion of the material from which the cylinder block 5 is formed and the material from which the stoppers are formed.
- screwing in the plugs the problem arises that aluminum has a relatively low strength, so that it also requires a correspondingly longer thread and thus a relatively large installation space.
- the sleeves 19, on their side facing the drive shaft 11, have a circumferential projection designated collar 31.
- the sleeves 19 By biased in the interior of the hollow piston 15 spring 17, which is also supported on the sleeve bottom 22, the sleeves 19 are pressed into the cylinder bores 13, so that they are supported on the collar 31 on the cylindrical view 5, wherein the outer periphery of the collar 31 is greater Therefore, they can not be pushed outward from the cylinder bores 13.
- the sleeves 19 can not be displaced in the direction of the eccentric 9 and slip out of the cylinder bores 13 inwardly. You will be charged with an external biasing force.
- the sleeves 19 are formed as substantially cylindrical tubes which have no bottom 22 exhibit.
- the sleeves 19 must be secured in other suitable manner, so that they can not be displaced in the direction of the eccentric 9 and can slip out of the cylinder bores 13 inwardly.
- the sleeves 19 can be firmly pressed or screwed into the cylinder block 5.
- the collar 31 of the sleeves 19 is preferably supported over its entire circumference on the inside of the cylinder block 9. It is preferably designed yielding, so that manufacturing tolerances in the contact area of the collar 31 on the inside of the cylinder block 5 can be compensated. By the collar 31, the length of the sleeves 19 is extended by the thickness thereof.
- the sleeves 19 are formed quasi cup-shaped, wherein the sleeve bottom 29 outside, so facing away from the drive shaft 11, is arranged in the cylinder bore 13.
- the openings 25 are arranged in the cylindrical wall 33 of the sleeve 19, here in the immediate vicinity of the sleeve bottom 22nd
- the sleeves 19 are inserted from the inside into the cylinder bores 13 in the cylinder block 5 and are supported on the inside of the annular cylinder block 5 with the collar 31.
- the cylindrical piston 15 are housed displaceable in the radial direction.
- An outward movement of the pistons 15 in the interior of the sleeves 19 is effected by the forces of the eccentric 9 acting on the bottom 21 of the pistons 15.
- a radial inward movement of the pistons 15 is caused by the springs 17 extending from the inside to the bottom. the 21 of the piston 15, also on the inside of the sleeve bottom 22. In a radial inward movement, a fluid is sucked into the space enclosed by the hollow piston interior.
- the weight of the radial piston pump 1 can be reduced by the fact that the cylinder block 5 made of light metal, preferably aluminum or magnesium.
- the cylinder block 5 made of light metal, preferably aluminum or magnesium.
- FIG. 2 shows a modified radial piston pump 1 ". Identical parts are provided with the same reference numerals, so that reference is made to the description of FIG.
- the only difference between the radial piston pumps according to FIGS. 1 and 2 is that in the radial piston pump 1 'according to FIG. 2 the fluid to be delivered does not come out of the Linderblock 5 enclosed interior of the radial piston pump is sucked, but from an annular space 35 which surrounds the cylinder block 5.
- the sleeves 19 shown in FIG. 2 are designed so long that their bottom 37 is in fluid communication with the annular space 35.
- the bottom 37 of the sleeves 19 is provided with a suction port 39, which is in fluid communication with the annular space 35 and is closed by a valve device 41.
- the valve device 41 has a valve plate 43 which is pressed sealingly against the suction opening 39 by a spring element 45 from the inside, that is to say from the inner space enclosed by the sleeve 19.
- the spring element 45 is supported on the one hand on the valve plate 43 from the inside, on the other hand on a base plate 47 housed in the interior of the sleeve 19, which is pressed radially outwards by the spring 17.
- the valve plate 43 acts quasi as a check valve: With a radial inward movement of the piston 15 creates a negative pressure in the interior 49 enclosed by this, so that a fluid present in the annular space 35 is sucked into the interior of the hollow piston 15 via the suction port 39.
- valve device 41 is preferably integrated in the plugs, which close the cylinder bores 13 in the cylinder block 5 to the outside, viewed in the radial direction.
- the cylinder block 5 of the radial piston pump 1 can be made of a light metal, preferably of aluminum or magnesium. This is protected in the operation of the radial piston pump 1 in the region of the cylinder bores 13 through the sleeves 19 from wear.
- the sleeves 19 are inserted from the inside into the cylinder bores 13 and are supported by their collar 31 on the inner surface of the cylinder block 5. Since the federal government is designed compliant, manufacturing tolerances are compensated, so that damage to the radial piston pump 1 can be avoided.
- All embodiments of the radial piston pump 1, V is also common that they are very simple. Since the length of the sleeves 19 is tuned to the radially measured thickness of the cylinder block 5 in a simple manner, the radial piston pumps can be designed very compact.
- the sleeves 19 réellere- From the inside of the cylinder block 5, which surrounds the interior 7, and the outer surface of the eccentric 5, there is always a free space anyway, so that here without further ado Bund 31 can be provided, with which the sleeves 19 are supported on the inside of the cylinder block 5.
- the radial piston pumps 1, 1 ' can therefore be designed very compact.
- the collar 31 is preferably elastic. In this way, manufacturing tolerances of the sleeve 19 and the inside of the cylinder block 5 can be optimally compensated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08838698A EP2212554B1 (en) | 2007-10-15 | 2008-10-02 | Radial piston pump |
DE112008002627T DE112008002627A5 (en) | 2007-10-15 | 2008-10-02 | Radial piston pump |
ES08838698T ES2391135T3 (en) | 2007-10-15 | 2008-10-02 | Radial piston pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007050365 | 2007-10-15 | ||
DE102007050365.4 | 2007-10-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009049776A1 true WO2009049776A1 (en) | 2009-04-23 |
WO2009049776A8 WO2009049776A8 (en) | 2009-07-16 |
Family
ID=40085662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/008352 WO2009049776A1 (en) | 2007-10-15 | 2008-10-02 | Radial piston pump |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2212554B1 (en) |
DE (1) | DE112008002627A5 (en) |
ES (1) | ES2391135T3 (en) |
WO (1) | WO2009049776A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR366337A (en) * | 1906-04-14 | 1906-10-02 | Joseph Monin | Central motion actuated multiple plunger pump |
WO1996028661A1 (en) * | 1995-03-11 | 1996-09-19 | Itt Automotive Europe Gmbh | Piston pump |
US5562430A (en) * | 1993-08-31 | 1996-10-08 | Robert Bosch Gmbh | Reciprocating piston pump with a housing block and at least one reciprocating piston pump element |
DE19801353A1 (en) * | 1998-01-16 | 1999-07-22 | Bosch Gmbh Robert | Radial piston pump providing HP fuel for fuel injection systems of internal combustion engines, especially with common rail injection system |
DE19928164A1 (en) * | 1999-06-19 | 2000-12-21 | Continental Teves Ag & Co Ohg | Reciprocating piston pump for electronically-regulating braking system has stepped piston with its larger diameter section displaced within pump capsule incorporating radial pressure valve |
EP1076174A2 (en) * | 1999-08-13 | 2001-02-14 | Robert Bosch Gmbh | Single cylinder high pressure pump |
-
2008
- 2008-10-02 DE DE112008002627T patent/DE112008002627A5/en not_active Withdrawn
- 2008-10-02 WO PCT/EP2008/008352 patent/WO2009049776A1/en active Application Filing
- 2008-10-02 ES ES08838698T patent/ES2391135T3/en active Active
- 2008-10-02 EP EP08838698A patent/EP2212554B1/en not_active Not-in-force
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR366337A (en) * | 1906-04-14 | 1906-10-02 | Joseph Monin | Central motion actuated multiple plunger pump |
US5562430A (en) * | 1993-08-31 | 1996-10-08 | Robert Bosch Gmbh | Reciprocating piston pump with a housing block and at least one reciprocating piston pump element |
WO1996028661A1 (en) * | 1995-03-11 | 1996-09-19 | Itt Automotive Europe Gmbh | Piston pump |
DE19801353A1 (en) * | 1998-01-16 | 1999-07-22 | Bosch Gmbh Robert | Radial piston pump providing HP fuel for fuel injection systems of internal combustion engines, especially with common rail injection system |
DE19928164A1 (en) * | 1999-06-19 | 2000-12-21 | Continental Teves Ag & Co Ohg | Reciprocating piston pump for electronically-regulating braking system has stepped piston with its larger diameter section displaced within pump capsule incorporating radial pressure valve |
EP1076174A2 (en) * | 1999-08-13 | 2001-02-14 | Robert Bosch Gmbh | Single cylinder high pressure pump |
Also Published As
Publication number | Publication date |
---|---|
DE112008002627A5 (en) | 2010-12-16 |
ES2391135T3 (en) | 2012-11-21 |
WO2009049776A8 (en) | 2009-07-16 |
EP2212554B1 (en) | 2012-08-29 |
EP2212554A1 (en) | 2010-08-04 |
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