EP1430224A1 - Connecting element for connecting a piston to a restoring element - Google Patents
Connecting element for connecting a piston to a restoring elementInfo
- Publication number
- EP1430224A1 EP1430224A1 EP02774375A EP02774375A EP1430224A1 EP 1430224 A1 EP1430224 A1 EP 1430224A1 EP 02774375 A EP02774375 A EP 02774375A EP 02774375 A EP02774375 A EP 02774375A EP 1430224 A1 EP1430224 A1 EP 1430224A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connecting element
- piston
- element according
- ring
- restoring
- 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
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 present invention relates to a connecting element for connecting a piston to a return element of a radial piston pump, the piston being movably mounted in a cylinder, being resetable via the return element and being in contact with a piston shoe.
- FIG. 4 shows a simplified sectional view of essential components of a radial piston pump.
- the radial piston pump shown in FIG. 4 is a pump with internal support, in which a stroke movement of an eccentric 17 is transmitted to the pistons 2 oscillating in the radial direction by means of an eccentric ring 13 via a piston shoe 3.
- a stroke movement of an eccentric 17 is transmitted to the pistons 2 oscillating in the radial direction by means of an eccentric ring 13 via a piston shoe 3.
- the piston 2 is mounted in a cylinder 4 and the piston 2 is reset from its top dead center position by means of a return spring 6, a support piston 5 and a ring element 14.
- the ring element 14 is attached to the piston 2 by means of shrinking or pressing on. This results in a non-positive connection between the piston 2 and the ring element 14.
- the spring force of the spring 6 acts directly on the ring element 14 via the support piston 5.
- the ring element 14 In operation, damage to the ring element 14 now frequently occurs because, on the one hand, the restoring force of the spring 6 is transmitted via the ring element 14 and, on the other hand, the ring element 14 must be firmly attached to the piston 2. Therefore, the The material of the ring element 14 must be selected such that, on the one hand, no cracks occur due to bending stresses caused by the spring force or as a result of the shrinking process, and on the other hand the press fit between the ring element 14 and the piston 2 must be sufficiently strong.
- a ring element has therefore been proposed in the prior art which eliminates the contrast between different material requirements for the ring element.
- a ring element is shown in Figure 5.
- the functions performed by the ring element have been transferred to two components.
- an annular base 14 is provided, which is shrunk onto the piston 2 in a known manner.
- a perforated disc 15 is provided as the second component, which engages a small shoulder of the ring base 14 and thus enables the piston 2 to be reset from its top dead center position by the return spring 6.
- the materials for the two components 14 and 15 can be selected optimally.
- the ring base 14 can be produced from a relatively tough material in order to enable easy shrinking on and the perforated disk 15 can be produced from a very hard material in order to absorb the bending stresses that occur.
- actuating element that is simple and inexpensive to manufacture and enables a secure connection of the two components.
- the connection is no longer carried out in a force-locking manner, but rather in a form-fitting manner.
- the elaborate shrinking or pressing of the ring element onto the piston used in the prior art can thereby be dispensed with.
- the geometry of the connecting element according to the invention can be made very simple. A simple test that can be carried out can, for example, immediately identify a faulty assembly in the connecting element according to the invention. If necessary, the connecting element according to the invention engages correctly and thus provides the positive connection or it is pulled off the piston during the pull-off test. As a result, faulty assembly can always be detected with absolute certainty.
- the connecting element is formed in two parts from a first part and a second part.
- the first part is arranged in a form-fitting manner in a recess formed in the piston, and the second part is in contact with the first part on the one hand and is connected to the piston shoe on the other hand.
- the first part is preferably designed as a retaining ring or snap ring, so that standard components can be used for the first part. This results in considerable cost advantages.
- the second part is preferably designed as an easy-to-manufacture perforated disk, so that manufacturing-related cost advantages can also be achieved here. Since the connecting element is also connected to the piston shoe, it can also enable the piston shoe to be reset at the same time. It should be noted that the restoring element can be in direct or indirect contact with the piston shoe.
- the connecting element is designed as a one-piece, essentially ring-shaped component.
- An inner region of the connecting element provides a positive connection with the piston.
- An outer area of the connecting element provides a connection to the restoring element or the piston shoe.
- the inner region of the connecting element is preferably formed by at least one surface which is bent out from a main plane of the one-piece connecting element.
- the inner area, which provides the positive connection is particularly preferably provided by four symmetrically arranged, identical surfaces. This results in a very good power distribution.
- the recess in the piston for the positive connection is preferably designed as an annular groove. As a result, the recess can also be provided in the piston simply and inexpensively. It should be noted that, however, it is also possible for recesses to be formed in the piston in accordance with the respective engagement areas of the connecting element for producing the positive connection.
- FIG. 1 shows a schematic sectional view of a connecting element according to a first exemplary embodiment of the present invention
- FIG. 2 shows a schematic sectional view of a connecting element according to a second exemplary embodiment of the present invention
- FIG. 3 shows a schematic top view of the connecting element shown in FIG. 2,
- Figure 4 is a schematic sectional view of a connecting element according to the prior art.
- Figure 5 is a schematic sectional view of a connecting element according to another prior art.
- a connecting element 1 according to a first exemplary embodiment of the present invention is described below with reference to FIG. 1.
- the connecting element 1 is formed in two parts and comprises a first part and a second part.
- the first part is a locking ring 7 and is arranged in a form-fitting manner in a groove 9 formed in a piston 2.
- the second part is designed as a perforated disc 8, the inside diameter of which is somewhat larger than the outside diameter of the piston 2.
- the inner region of the perforated disk 8 is in contact with the locking ring 7 in such a way that it rests on the locking ring 7.
- the perforated disk 8 is connected on the one hand to a piston shoe 3 and on the other hand the perforated disk 8 rests on a shoulder of a support piston 5.
- the perforated disc lies on the side facing away from the piston shoe 3 the locking ring.
- the perforated disc 8 comprises a first outer plane in which it is in contact with the piston shoe 3 on the one hand and with the support piston 5 on the other hand, a second inner plane with which it is in contact with the locking ring 7 and a tapering area which the connects the outer and inner levels.
- the support piston 5 is moved by means of a return spring 6 in order to enable the piston 2 to be reset from its top dead center position.
- the piston 2 is mounted in a cylinder 4 so that it can move back and forth.
- the piston 2 is reset from the top dead center position shown in FIG. 1 via the support piston 5 and the outer area of the perforated disk 8, as a result of which the piston 2 is pressed downward over the inner area of the perforated disk 8 and the locking ring 7.
- the piston shoe 3 is also reset via the support piston 5 and the perforated disc 8.
- the groove 9 in the piston 2 is designed as an annular groove, so that an inexpensive standard retaining ring or a snap ring can be used as the first part 7.
- FIGS. 2 and 3 show a connecting element 1 according to a second exemplary embodiment of the present invention 15.
- the same or functionally the same parts are designated with the same reference numerals as in the first embodiment.
- the connecting element 1 is formed in one piece in accordance with the second exemplary embodiment.
- the number of parts can be reduced and in particular the manufacturing costs and the assembly costs for the connecting element 1 can be significantly reduced.
- Connecting element 1 has an inner region 11 and an outer region 12.
- the inner region 11 enables the positive connection between the connecting element 1 and the piston 2.
- the outer region 12 serves to receive and transmit the
- four engagement surfaces 10 are formed on the inner region 11 of the connecting element 1 engage a groove 9 formed in the piston 2 in order to produce a positive connection between the connecting element 1 and the piston 2.
- the engagement surfaces 10 are produced by punching out and bending out from a base plane E of the essentially disk-shaped connecting element 1.
- the outer regions 12 are also produced by bending the outer edge of the connecting element 1 out of the base plane E.
- the outer regions 12 are arranged on a different plane than the inner regions 11 (cf. FIG. 2).
- the connecting element 1 can be produced, for example, by punching out a sheet-like material and then bending the inner regions to the engagement surfaces 10 or the outer edge to the outer region 12.
- both the geometry of the groove 9 and the geometry of the engagement surfaces 10 of the connecting element 1 can be selected as desired.
- the groove 9 is designed as an annular groove.
- the present invention thus relates to a connecting element 1 for connecting a piston 2 to a piston shoe 3 of a radial piston pump.
- the piston 2 is movably mounted in a cylinder 4 and can be reset from its top dead center position via a reset element 6.
- the connecting element 1 is positively connected to the piston 2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10147981 | 2001-09-28 | ||
DE10147981A DE10147981A1 (en) | 2001-09-28 | 2001-09-28 | Connecting element for piston movable inside cylinder by means of re-adjusting element, consists of two parts with first part in piston cavity |
PCT/DE2002/003458 WO2003031816A1 (en) | 2001-09-28 | 2002-09-16 | Connecting element for connecting a piston to a restoring element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1430224A1 true EP1430224A1 (en) | 2004-06-23 |
EP1430224B1 EP1430224B1 (en) | 2005-01-19 |
Family
ID=7700704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02774375A Expired - Lifetime EP1430224B1 (en) | 2001-09-28 | 2002-09-16 | Connecting element for connecting a piston to a restoring element |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040177752A1 (en) |
EP (1) | EP1430224B1 (en) |
JP (1) | JP2005504926A (en) |
DE (2) | DE10147981A1 (en) |
WO (1) | WO2003031816A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10344459B4 (en) * | 2003-09-25 | 2012-06-14 | Robert Bosch Gmbh | Piston pump, in particular high-pressure piston pump |
DE102008000824A1 (en) * | 2008-03-26 | 2009-10-01 | Robert Bosch Gmbh | Pump, in particular high-pressure fuel pump |
DE102008043436A1 (en) * | 2008-11-04 | 2010-05-06 | Robert Bosch Gmbh | Piston pump with a piston holder |
DE102009027689A1 (en) | 2009-07-14 | 2011-01-20 | Robert Bosch Gmbh | Fuel high-pressure pump for fuel injection system of internal-combustion engine of motor vehicle, has slots extending from central through-hole of spring disk, which is supported at guided piston in axial direction |
DE102010038468A1 (en) * | 2010-07-27 | 2012-02-02 | Robert Bosch Gmbh | high pressure pump |
DE102011017573A1 (en) * | 2011-04-27 | 2012-10-31 | Robert Bosch Gmbh | Spring plate for a plunger assembly of a high pressure pump and high pressure pump |
DE102011017571A1 (en) * | 2011-04-27 | 2012-10-31 | Robert Bosch Gmbh | Spring plate for a plunger assembly of a high pressure pump and high pressure pump |
DE102016203768B4 (en) * | 2015-11-12 | 2017-10-26 | Robert Bosch Gmbh | Pump, in particular high-pressure pump of a fuel injection system, with a mounting assembly of plunger assembly and pump cylinder head, in particular by a latching connection between spring plate and plunger body |
GB201521130D0 (en) * | 2015-12-01 | 2016-01-13 | Delphi Internat Operations Luxembourg S À R L | Fuel pump |
WO2022169608A1 (en) * | 2021-02-05 | 2022-08-11 | Wagner Spray Tech Corporation | Piston coupler for a reciprocating pump |
DE102022113946A1 (en) | 2022-06-02 | 2023-12-07 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Pneumatic piston and a method for producing the same |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5382140A (en) * | 1993-02-11 | 1995-01-17 | Elasis Sistema Ricerca Fiat Nel Mezzogiorno | Radial-piston pump |
DE4401074B4 (en) * | 1994-01-15 | 2007-01-18 | Robert Bosch Gmbh | Pump arrangement, in particular for conveying fuel from a reservoir to an internal combustion engine |
DE4443868A1 (en) * | 1994-12-09 | 1996-06-13 | Teves Gmbh Alfred | Radial piston machine |
DE19650246A1 (en) * | 1996-12-04 | 1998-06-10 | Bosch Gmbh Robert | High-pressure fuel pump housed on engine wall |
IT239879Y1 (en) * | 1996-12-23 | 2001-03-13 | Elasis Sistema Ricerca Fiat | REFINEMENTS TO A PISTON PUMP, IN PARTICULAR TO A RADIAL APISTON PUMP FOR THE FUEL OF AN INTERNAL COMBUSTION ENGINE. |
DE19729791A1 (en) * | 1997-07-11 | 1999-01-14 | Bosch Gmbh Robert | Radial piston pump for high-pressure fuel supply |
DE19753593A1 (en) * | 1997-12-03 | 1999-06-17 | Bosch Gmbh Robert | Radial piston pump for high-pressure fuel supply |
DE19801398A1 (en) * | 1998-01-16 | 1999-07-22 | Bosch Gmbh Robert | Radial piston pump for the fuel delivery to a motor fuel injection system |
DE19802475A1 (en) * | 1998-01-23 | 1999-07-29 | Bosch Gmbh Robert | Radial piston pump to supply fuel at high pressure for fuel injection system of internal combustion engine |
DE19804275A1 (en) * | 1998-02-04 | 1999-08-12 | Bosch Gmbh Robert | Radial piston pump for high-pressure fuel supply |
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 |
DE19829546A1 (en) * | 1998-07-02 | 2000-01-13 | Bosch Gmbh Robert | Radial piston pump |
JP4016237B2 (en) * | 1999-04-16 | 2007-12-05 | 株式会社デンソー | Fuel injection pump |
-
2001
- 2001-09-28 DE DE10147981A patent/DE10147981A1/en not_active Withdrawn
-
2002
- 2002-09-16 EP EP02774375A patent/EP1430224B1/en not_active Expired - Lifetime
- 2002-09-16 WO PCT/DE2002/003458 patent/WO2003031816A1/en active IP Right Grant
- 2002-09-16 JP JP2003534766A patent/JP2005504926A/en not_active Withdrawn
- 2002-09-16 DE DE50202081T patent/DE50202081D1/en not_active Expired - Fee Related
-
2004
- 2004-03-26 US US10/810,104 patent/US20040177752A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO03031816A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003031816A1 (en) | 2003-04-17 |
DE50202081D1 (en) | 2005-02-24 |
EP1430224B1 (en) | 2005-01-19 |
US20040177752A1 (en) | 2004-09-16 |
JP2005504926A (en) | 2005-02-17 |
DE10147981A1 (en) | 2003-04-24 |
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