EP1828600A1 - Kolbenanordnung einer hydraulischen kolbenmaschine - Google Patents
Kolbenanordnung einer hydraulischen kolbenmaschineInfo
- Publication number
- EP1828600A1 EP1828600A1 EP05807874A EP05807874A EP1828600A1 EP 1828600 A1 EP1828600 A1 EP 1828600A1 EP 05807874 A EP05807874 A EP 05807874A EP 05807874 A EP05807874 A EP 05807874A EP 1828600 A1 EP1828600 A1 EP 1828600A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- shoe
- sliding
- sliding shoe
- assembly according
- 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.)
- Ceased
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
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0602—Component parts, details
- F03C1/0605—Adaptations of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
- F16J1/22—Connection to driving members with connecting-rods, i.e. pivotal connections with universal joint, e.g. ball-joint
-
- 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
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
Definitions
- the invention relates to a piston arrangement of a hydraulic piston machine, for example an axial or radial piston machine according to the preamble of patent claim 1.
- a radial piston pump used as a gasoline pump in which the sliding shoes are made of plastic and are clipped onto ball heads of the pistons.
- the plastic materials used are selected for their wear resistance and must have a corresponding elasticity in order to clip the shoe can.
- clip-on is facilitated by forming elastic tongues in the clip-on area. Due to the required elasticity of the padded on the piston shoe area, it may happen under unfavorable operating conditions that solve the shoes from the piston, so that the pump wears prematurely.
- a further disadvantage is that a comparatively high installation effort is required for clipping the sliding shoes onto the pistons.
- the invention is based on the object to provide a piston assembly for a hydraulic piston engine, in which the production cost is simplified.
- the inventive piston assembly has a piston which is pivotally connected to a shoe.
- This shoe is molded by injection directly to the piston, so that no separate process step is required.
- the piston itself is a part of the injection mold, an extremely precise fit in the articulation region of the sliding shoe to the piston be assured that a reliable connection also, then allows when the piston surface in the connection area outside the predetermined tolerance, since these tolerances are compensated by the direct injection molding of the shoe.
- the shoe bearing the piston foot is preferably spherical and positively embraced by the shoe, so that a non-destructive non-releasable ball joint is formed.
- the piston and the sliding shoe are penetrated by a channel with a nozzle which opens into the sliding surface.
- a channel pressure medium from the piston chamber is guided in the sliding area, so that the contact pressure of the sliding block on the swash plate is reduced and the wear is minimized accordingly.
- the aforementioned nozzle can be formed either in the piston or in the shoe.
- the part located in the shoe and the part of the channel located in the piston must be designed so that the Druckstoff für remains open to the sliding surface during this Relativverschwenkung.
- this is made possible by the fact that in the transition region between the piston and slider a funnel-shaped extension is formed, whose opening is adapted to the maximum pivot angle during the relative pivoting of these components.
- the sliding blocks can be formed on the outer circumference of an annular end face, which is approximately in the same plane as the piston facing the mouth of the slide shoe penetrating channel portion. This annular end face can be formed for example by an annular groove.
- the sliding block is made of PEEK.
- This material is characterized by good sprayability, low shrinkage during the solidification process and high wear resistance, and is therefore particularly suitable for the Gleitschuhkonstrutation invention.
- the piston can also be made of plastic, so that, for example, piston and shoe can be injected in a tool in succession.
- the piston assembly 1 shows a three-dimensional representation of a piston assembly 1, as it can be used in an axial piston machine.
- the piston assembly 1 consists of a piston 2 which is provided with a sliding block 4.
- the piston is made of a CrMo steel
- the sliding block 4 is made of a wear-resistant thermoplastic, for example, reinforced PEEK.
- the peculiarity is that this shoe 4 is injected directly to the piston 2 and thus reliably connected to this.
- FIG. 2 shows a longitudinal section through the piston arrangement 1 according to FIG. 1.
- the piston 2 has a cylindrical section 6, which merges via a constriction 8 into a spherical piston foot 10.
- the piston 2 is penetrated in the axial direction by an axial bore, which is extended to an annular end face 12 of the piston 6 toward a space 14.
- the axial bore is narrowed to a nozzle 16, which opens axially via a funnel-shaped enlargement 18 in a flattened end region 20 of the piston foot 10.
- the geometry of the flattening 20 is selected so that its peripheral edge surrounds the mouth of the extension 18.
- a suction valve-valve body of the axial piston machine can be performed.
- the wall thickness S of the connecting portion 22 is chosen so that the shoe 4 can not be deducted during operation of the piston engine by elastic deformation of the piston 6, the release of this compound is thus only by force possible - such a load occurs during normal operation of the pump but not on.
- a channel section 24, which has a Pocket 26 opens into a sliding surface 28 of the sliding shoe 4, with which this rests on a swash plate of the axial piston machine.
- the diameter of the channel section 24 is selected larger than the diameter of the nozzle 16 and designed so that even with a Relatiwer- pivoting between the piston 2 and shoe 4 (see Figure 3), the pressure fluid flow path through the piston assembly remains open. That is, in the embodiment shown in Figure 2, even with Relativverschwenkung a partial overlap between the channel portion 24 and the funnel-shaped extension 18.
- the valve seat for the suction valve forming annular end face 12 with the adjoining end face areas of the space 14 defines a working space in a cylinder drum Axial piston machine in which a plurality of the above-described piston assemblies are guided axially movable.
- pressure medium flow path space 14, nozzle 16, extension 18, channel section 24 and pocket 26
- pressure fluid from this working space can reach the sliding surface 28 so that acts on the shoe a kind of back pressure, which reduces the contact pressure on the swash plate, wherein forms a film in the contact area, which additionally reduces the friction of the shoe 4, so that its wear is minimal.
- the sliding shoe 4 is molded directly onto the piston shoe 6.
- the piston 6 or, in the case of a multiple mold, a multiplicity of pistons 6 are inserted into the injection mold and optionally the spherical piston base 10 is coated with a release agent.
- the parting line is chosen so that it extends perpendicular to the plane in Figure 2 through the central axis 25.
- the injection molding is preferably carried out in the region facing the piston 6, FIG. 2 shows a preferred position of this injection point, which is indicated by the reference numeral. chen 29 is provided.
- the melt then flows around the spherical piston base 10 and fills the tool cavity, so that the undercut shown in FIG. 2 is formed.
- a molding pin is used in this area, through which then the contour of the KanalabSchnitt 24 and optionally the pocket 26 is formed.
- the outer periphery of the shoe 4 is set back in the right area (view of Figure 2), so that an annular end face 30 ensteht, which merges to avoid excessive stress forces via a groove 32 in the subsequent cylindrical peripheral surface.
- a holding means can be supported, via which the sliding shoes 4 of the axial piston pump are fixed with respect to a drive shaft in the axial direction and in the direction of rotation and biased in the direction of the swash plate.
- FIGS. 3 and 4 show an alternative exemplary embodiment of a piston arrangement 1, FIG. 4 showing a longitudinal section corresponding to FIG. 2 and FIG. 3 showing the piston 6 and the sliding block 4 of this piston arrangement with relative pivoting.
- the sliding shoe 4 is molded by injection directly to the piston 2, so that the piston 10 of the piston 2 of the spherical cap Connection area 22 is encompassed.
- the nozzle 16 is not formed in the piston 2 but in the shoe 4 in the variant shown in Figures 3 and 4. Accordingly, the nozzle 16 opens via the also formed on the shoe 4 funnel-shaped extension 18 in the piston foot 10 form-fitting embracing part of the connecting portion 22.
- a channel portion 24 is then formed, on the one hand in the apex of the piston 10 and on the other hand in the room 14 opens.
- the diameter of the channel section 24 is in turn made larger than that of the nozzle 16, which opens into a pocket 26 of the sliding surface 28.
- the preparation is similar to the above-described embodiment, wherein the funnel-shaped extension 18 and the nozzle 16 are formed in the shoe 4 by the piston 2 the front side closing mold pin.
- the injection point 29 is again in the same range as in the above-described exemplary embodiment.
- the annular end face 30 is formed by an annular groove 34, which is introduced into the radially recessed cylindrical portion of the sliding shoe 4, in the resulting annular groove 34 can engage the Qualcommsehrlebende connecting means of the axial piston machine.
- a piston assembly of a hydraulic piston machine for example an axial piston machine, wherein a sliding shoe is attached to a piston.
- this shoe is formed directly, for example by injection molding of the piston.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Reciprocating Pumps (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Hydraulic Motors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004060945A DE102004060945A1 (de) | 2004-12-17 | 2004-12-17 | Kolbenanordnung einer hydraulischen Kolbenmaschine |
PCT/DE2005/002001 WO2006063545A1 (de) | 2004-12-17 | 2005-11-08 | Kolbenanordnung einer hydraulischen kolbenmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1828600A1 true EP1828600A1 (de) | 2007-09-05 |
Family
ID=35709293
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05807874A Ceased EP1828600A1 (de) | 2004-12-17 | 2005-11-08 | Kolbenanordnung einer hydraulischen kolbenmaschine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090301295A1 (de) |
EP (1) | EP1828600A1 (de) |
DE (1) | DE102004060945A1 (de) |
WO (1) | WO2006063545A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011010278A1 (de) | 2011-02-04 | 2012-08-09 | Robert Bosch Gmbh | Kolbenanordnung einer hydraulischen Kolbenmaschine und Verfahren zu ihrer Herstellung |
DE102011010296A1 (de) | 2011-02-04 | 2012-08-09 | Robert Bosch Gmbh | Kolbenanordnung einer hydraulischen Kolbenmaschine |
DE102012002913A1 (de) | 2011-03-12 | 2012-09-13 | Robert Bosch Gmbh | Montagespritzgussverfahren zur Herstellung eines Kugelgelenks unter Verwendung eines Füllteils |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3183848A (en) * | 1962-05-09 | 1965-05-18 | Hydro Kinetics Inc | Cartridge type pumping apparatus |
US5490446A (en) * | 1994-03-22 | 1996-02-13 | Caterpillar Inc. | Apparatus and method for a piston assembly |
EP0770178B1 (de) * | 1994-07-08 | 1999-09-01 | Danfoss A/S | Kolben mit gleitschuh und verfahren zu dessen herstellung |
DE4424672A1 (de) * | 1994-07-13 | 1996-01-18 | Danfoss As | Kolben-Gleitschuh-Anordnung |
DE4424670B4 (de) * | 1994-07-13 | 2005-11-03 | Danfoss A/S | Hydraulische Kolbenmaschine |
US6183212B1 (en) * | 1999-02-17 | 2001-02-06 | Stanadyne Automotive Corp. | Snap-in connection for pumping plunger sliding shoes |
US6217289B1 (en) * | 2000-04-20 | 2001-04-17 | The Rexroth Corporation | Axial piston pump with auxiliary pump |
-
2004
- 2004-12-17 DE DE102004060945A patent/DE102004060945A1/de not_active Withdrawn
-
2005
- 2005-11-08 US US11/793,551 patent/US20090301295A1/en not_active Abandoned
- 2005-11-08 WO PCT/DE2005/002001 patent/WO2006063545A1/de active Application Filing
- 2005-11-08 EP EP05807874A patent/EP1828600A1/de not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO2006063545A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20090301295A1 (en) | 2009-12-10 |
DE102004060945A1 (de) | 2006-07-06 |
WO2006063545A1 (de) | 2006-06-22 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20070717 |
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AK | Designated contracting states |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KANE, BRIAN |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20080825 |
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REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
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18R | Application refused |
Effective date: 20130612 |