WO2001011235A1 - Radial piston pump - Google Patents
Radial piston pump Download PDFInfo
- Publication number
- WO2001011235A1 WO2001011235A1 PCT/EP2000/007143 EP0007143W WO0111235A1 WO 2001011235 A1 WO2001011235 A1 WO 2001011235A1 EP 0007143 W EP0007143 W EP 0007143W WO 0111235 A1 WO0111235 A1 WO 0111235A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- eccentric ring
- radial piston
- piston pump
- pump according
- eccentric
- 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
- F04B1/0413—Cams
Definitions
- the invention relates to a radial piston pump with a rotating pump shaft, a section of which is connected to a non-rotatably arranged eccentric ring and with a needle bearing arranged on the outer surface of the eccentric ring, consisting of a needle sleeve with radially inwardly directed ribs between which roller needles roll, the outer of which Raceway are formed by the inner circumferential surface of the needle sleeve and the inner raceway of which is formed by the circumferential surface of the eccentric ring, and at least one pump plunger arranged in a pump housing and running radially to the pump shaft is supported with its end face on the needle sleeve.
- Such a generic eccentric arrangement of a reciprocating pump is previously known from DE 196 25 686 A1.
- this known eccentric arrangement comprises a drive shaft with a reduced diameter shaft journal on which an eccentric ring is attached.
- This eccentric ring consists of a bearing sleeve which is pressed onto the shaft journal with a sleeve section. At both ends, the sleeve section of the bearing sleeve merges into a radially outwardly directed flange, the inclinations of the flanges being different.
- the actual eccentric ring made of a polymeric material is held between the two flanges of the bearing sleeve.
- the eccentric ring made of the polymeric material is in turn surrounded on its outer surface by a ring which functions as the inner bearing ring of the attached needle bearing.
- Radially movable reciprocating pistons are supported with their end faces on the needle sleeve of the needle bearing.
- the disadvantage of this eccentric arrangement is that it is composed of several parts, namely the bearing sleeve, the actual eccentric ring and the bearing ring comprising the eccentric ring.
- Such a multi-part eccentric arrangement is complex to manufacture and assemble.
- the object of the invention is therefore to develop an improved eccentric arrangement for a radial piston pump.
- the eccentric ring is designed as a non-cutting hollow sheet metal part with two spaced-apart receiving bores.
- the advantage of the solution according to the invention lies mainly in the fact that this eccentric arrangement is designed to be considerably simpler because, compared to the closest prior art, the actual eccentric ring made of a polymer material and the bearing ring comprising it are unnecessary. Thanks to the hollow, eccentric ring without cutting, the press-on forces caused by the overlap between the shaft and the eccentric ring can also be better compensated for. In addition, the chipless technology makes it easy to produce eccentric rings of different sizes in any size.
- FIGS. 1, 2 and 3 show a longitudinal section through an eccentric arrangement with differently designed eccentric rings
- Figures 4 and 5 show a longitudinal section through differently designed eccentric rings.
- FIG. 1 shows an eccentric arrangement of a radial piston pump according to the invention, in which the pump shaft 1 provided with the end section 2 rotates about its longitudinal axis 3.
- the eccentric ring 4 is held by means of a force fit or a positive fit, which with its outer surface forms the inner race 13 for bearing needles 10 guided in the cage 11.
- the associated outer race 14 is provided by the needle sleeve 7, which is provided at each end with a radially inwardly directed rim 8 and 9. Both rims 8 and 9 have such a radial extent that they partially cover the eccentric ring 4 on the end face.
- Pump plungers 12 rest on the lateral surface of the needle sleeve 7 and are set in a radial up and down movement when the pump shaft 1 rotates.
- the eccentric ring 4 is designed as a non-cutting hollow sheet metal part, the receiving bores 5 and 6 of which are spaced apart from one another in the axial direction extend coaxially about the longitudinal axis 3 of the pump shaft 1, so that when the eccentric ring 4 is connected to the pump shaft 1 in a rotationally fixed manner, the pump plungers 12 be moved radially.
- the eccentric arrangement shown in FIG. 2 differs from that in FIG. 1 firstly by the differently designed needle sleeve 18 and secondly by the differently designed eccentric ring 17.
- the needle sleeve 18 has a flange 19 with an elongated radial extension, so that it partially covers the eccentric ring 17 on its end face, while the associated rim 20 ends its radial extension above the lateral surface of the eccentric ring 17. This ensures that the needle sleeve 17 can be easily pushed onto the eccentric ring 17 from left to right.
- the eccentric ring 17 is in turn formed as a non-cutting hollow sheet metal part which is provided with two receiving bores 5 and 6, which extend concentrically around the axis of rotation 3.
- the eccentric ring 17 In its upper part, the eccentric ring 17 has two radially inwardly directed first ribs 15 and 16, to which two inwardly directed, opposing second ribs 21 and 22 are connected. In the lower part, the rims 21, 22 rest directly on the cylindrical part of the eccentric ring 17 forming the inner race 13. The press-on length and thus the stability of the eccentric ring 17 are improved by the second ribs 21, 22.
- the eccentric arrangement shown in FIG. 3 has the needle sleeve 26, the two radially inwardly directed rims 27 and 28 of the same length and do not cover the eccentric ring 23.
- the eccentric ring 23 is composed of two non-cutting sleeves 24 and 25, which are matched in their radial extent so that they fit into each other.
- the two bushes 24 and 25 are joined together in such a way that the associated bases 30 and 29 with the associated receiving bores 5 and 6 face away from one another.
- the receiving holes 5 and 6 are made by a punching process.
- the eccentric ring shown in FIG. 4 and designated 31 has on the left side the first flange 15, which is folded radially inwards and encloses the receiving bore 5. On the right side, the eccentric ring 31 is provided with the flange 34, which surrounds the disk 32, which is provided with the eccentrically offset receiving bore 33. The mounting on the shaft section 2 now takes place in such a way that the eccentric ring 31 is pressed on by means of the receiving bore 5 and by means of the receiving bore 33 of the disk 32.
- the eccentric ring 23 shown in Figure 5 is similar to that shown in Figure 3 and again consists of the two parts 24 and 25 joined into one another, the part 25 being provided with a further inboard rim 35. In this way, the stability of the eccentric ring 23 is increased due to the extended.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00956281A EP1203157A1 (en) | 1999-08-10 | 2000-07-26 | Radial piston pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19937613.1 | 1999-08-10 | ||
DE1999137613 DE19937613A1 (en) | 1999-08-10 | 1999-08-10 | Radial piston pump |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001011235A1 true WO2001011235A1 (en) | 2001-02-15 |
Family
ID=7917773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/007143 WO2001011235A1 (en) | 1999-08-10 | 2000-07-26 | Radial piston pump |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1203157A1 (en) |
DE (1) | DE19937613A1 (en) |
WO (1) | WO2001011235A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0539849A1 (en) * | 1991-10-28 | 1993-05-05 | INA Wälzlager Schaeffler KG | Eccentric anti-friction drive for fluid power apparatus |
US5842405A (en) * | 1996-06-27 | 1998-12-01 | Robert Bosch Gmbh | Eccentric arrangement for a reciprocating piston pump |
-
1999
- 1999-08-10 DE DE1999137613 patent/DE19937613A1/en not_active Withdrawn
-
2000
- 2000-07-26 WO PCT/EP2000/007143 patent/WO2001011235A1/en not_active Application Discontinuation
- 2000-07-26 EP EP00956281A patent/EP1203157A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0539849A1 (en) * | 1991-10-28 | 1993-05-05 | INA Wälzlager Schaeffler KG | Eccentric anti-friction drive for fluid power apparatus |
US5842405A (en) * | 1996-06-27 | 1998-12-01 | Robert Bosch Gmbh | Eccentric arrangement for a reciprocating piston pump |
Also Published As
Publication number | Publication date |
---|---|
EP1203157A1 (en) | 2002-05-08 |
DE19937613A1 (en) | 2001-02-15 |
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