WO2001007757A2 - Kolbenanordnung für eine kolbenmaschine - Google Patents
Kolbenanordnung für eine kolbenmaschine Download PDFInfo
- Publication number
- WO2001007757A2 WO2001007757A2 PCT/EP2000/006072 EP0006072W WO0107757A2 WO 2001007757 A2 WO2001007757 A2 WO 2001007757A2 EP 0006072 W EP0006072 W EP 0006072W WO 0107757 A2 WO0107757 A2 WO 0107757A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- arrangement according
- recess
- piston arrangement
- joint
- 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
- F04B1/12—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
Definitions
- the invention relates to a piston arrangement according to the preamble of claim 1.
- a piston arrangement is described in DE 197 34 217 AI.
- This known piston arrangement has a piston with a base section, from which an articulated part extends in one axial direction and a hollow cylindrical peripheral wall in the other axial direction up to the front free end of the hollow piston, which encloses a cylindrical cavity in the piston.
- the joint part which extends in the other axial direction is formed by a hemispherical joint recess in which the joint ball of a sliding block is pivotally mounted, a recess edge projecting beyond the equator of the joint recess being flanged to a position which engages behind the joint ball in a form-fitting manner.
- the piston which is prefabricated with a cross-sectional oversize, is positively connected to the joint ball of the sliding block after it has been connected to the sliding block by cold flanging a recess edge projecting radially from the lateral surface of the piston.
- the piston is then hardened on its outer surface, after which the outer surface is finished, in particular by grinding.
- This known method requires a considerable amount of work, the machining step being the last step.
- a considerable widening of the flare is to be expected, which can be attributed to the fact that due to the considerable tensions occurring during cold deformation, the flare springs back and therefore the flare only engages behind the joint ball with a relatively large amount of play.
- the jacket surface of the piston forming a guide surface can extend into the region of the recess edge, whereby on the one hand improved guidance for the piston is achieved and on the other hand, a shorter design for the piston arrangement and, as a result, also for the piston machine can be achieved.
- the invention has for its object a
- the arrangement of the joint ball on the slide shoe instead of the piston creates a longer sliding surface. By closing off the cavity, a dead volume that is also compressed when a piston is open toward the working volume is avoided.
- the hollow piston has an annular cavity which is delimited on the inside by a central pin which extends from the base section of the hollow piston " to a cover which is in contact with the
- the central pin forms an axial support and stabilizing element which is able to be supported axially on the cover and thereby the
- Base section significantly stabilized.
- the base portion can be formed with a smaller axial length.
- material and weight can also be saved, which is due to the reduced longitudinal dimension of the
- Figure 1 shows a piston assembly according to the invention in axial section.
- FIG. 2 shows the piston arrangement according to FIG. 1 in a modified configuration
- Fig. 5 shows the piston arrangement in a further modified embodiment.
- the piston arrangement generally designated 1, comprises a hollow piston 2, preferably made of steel, and a sliding block 3, preferably made of bronze or brass, which are pivotally connected to one another by a ball joint connection 1A while ensuring unilateral limited pivoting movements between the hollow piston 2 and the sliding block 3.
- the central axes of the piston 2 and the sliding block 3 are designated 2a and 3a.
- the hinge connection 1A has a dome-shaped or spherical segment-shaped joint recess 5 with a depth a that is greater than the spherical radius r of a joint ball 4 pivotally mounted therein, a recess edge 7 axially projecting beyond the equator 6 of the joint recess 5 engaging behind the joint ball 4 and thereby in this spherical ring zone convergent shape of the joint ball 4 can at least partially follow while maintaining a play of movement.
- the axial length b of the recess edge 7 is dimensioned so long that in the maximum swivel position shown in Fig. 1 it extends into the corner region between the joint ball 4 and a ball neck or a base part 8 of the sliding block 3 extends. Tapered in the present embodiment the recess edge 7 towards its free end, the outer lateral surface preferably being a conical surface.
- the cavity 9 which is designed as an annular space, extends from a rear base section 11, in which the joint recess 5 is arranged, to an end section, which is formed by a cover 12 and is preferably connected to the circumferential wall of the remaining piston part by a friction welding process.
- the gap between the welded parts before the friction welding process is illustrated by a dashed line.
- the annular cavity 9 surrounds a cylindrical central pin 13, which extends in one piece from the base section 11 to the front and is also connected by friction welding to the cover 12 or to a central pin extension 14 projecting therefrom.
- the closed design of the hollow piston 2 avoids an enlargement of the cross section of the hollow piston at high pressure and compression losses due to the relatively large volume of the piston chambers.
- a channel 19a, 19b extends longitudinally through the hollow piston 2 and the slide shoe 3 and opens into a flat recess 22 arranged on the flat foot surface 21 of the slide shoe 3.
- the working pressure in the hydraulic medium can extend up to the recess 22 in the functional operation of the hydrostatic machine reproduce where the hydraulic medium causes lubrication and the pressure relieves pressure in a manner known per se.
- the hollow piston 2 preferably consists of hardenable steel, in particular of steel hardenable by nitriding. In order to increase the strength and hardness, its outer surface is preferably nitrided and hardened.
- the present ball-and-socket joint 1A is suitable for the pivotable support of a piston 2 for piston machines, in particular axial piston machines, on a support surface S against which the slide shoe 3 rests with its foot surface 21.
- the support surface S can be the oblique surface of a so-called oblique writing.
- the slide shoe 3 can be manufactured as a finally finished component in large numbers and provided for connection to the hollow piston 2.
- the hollow piston 2 is preferably also prefabricated and made available in large numbers as a prefabricated piston blank.
- the recess edge 7 extends axially with an inner diameter d, which can be adapted to the diameter of the joint ball 4 or the joint recess 5, taking into account a play of movement, so that the joint ball 4 can be inserted into the joint recess 5.
- the front cover 12 and the remaining piston part 2b are produced with a cross-sectional oversize x, which is hardened after welding, if necessary after prior nitriding, and finished by machining, for example by grinding.
- the order of the process steps can be before or after welding, namely the incorporation of the cavity 9 of the joint recess 5 and the channel 19a as desired. It is advantageous to carry out the positive connection of the joint ball 4 to the hollow piston 2 after the nitriding and / or hardening and finishing of the jacket surface 2c as the last step.
- the recess edge 7 is removed by means of a suitable heating device, e.g. In the form of a heating ring 23 shown in the drawing, approximately in the width of the axial length b, heated to a temperature at which the hardness of the material is reduced, so that even after the material has cooled, the recess edge 7 can be crimped with lower deformation forces or to a Temperature can be heated, at which the strength of the material is reduced and the recess edge 7 can be hot flanged. In both cases, the recess edge 7 can be crimped plastically with relatively low forces into the shape shown in FIG. 1, which engages the articulated ball 4 in a form-fitting manner.
- a suitable heating device e.g. In the form of a heating ring 23 shown in the drawing, approximately in the width of the axial length b, heated to a temperature at which the hardness of the material is reduced, so that even after the material has cooled, the recess edge 7 can be crimped with lower deformation forces or to
- the relatively low deformation forces ensure that the recess edge 7 without mechanical overloading of the e.g. made of softer material is deformed shoe 3.
- the heating can be done by direct heating e.g. by means of a flame or inductively by an inductive electrical heating device. Due to the local heating of the recess edge 7, the hardened material becomes soft again in this area and it can therefore be easily deformed without the remaining area of the piston 2 suffering significant losses in hardness.
- a major advantage of the above-described method is that the hollow piston 2 can be completely finished before being joined and connected to the sliding block 3, without the above-described one Special measures with regard to the flaring would be necessary, such as covering the recess edge 7 to be deformed during nitriding, in particular gas nitriding, turning off already nitrided areas prior to flanging, etc.
- the optimal play of the ball joint connection 1 set very easily and can also be reliably reproduced in series production.
- the configuration according to the invention leads on the one hand to a substantial stabilization of the hollow piston 2 and not only with regard to bending stresses but also with regard to axial compressive stresses to which the hollow piston 2 is exposed in particular during a pressure stroke, in which a pressure force, indicated by arrow 25, against its working surface 26 on its surface acts free end, which is received by the sliding block 3 in the articulation 1A.
- a pressure force indicated by arrow 25 against its working surface 26 on its surface acts free end, which is received by the sliding block 3 in the articulation 1A.
- the equally large and opposite directional resistance force, indicated by arrow 27, is introduced into the hollow piston 2, specifically against the base section 3.
- the base section 3 is thus the part of the hollow piston 2 that is directly exposed to the compressive stresses.
- the central pin 13 forms an axially effective support or
- the base section 3 and / or the lid 12 can have a smaller axial dimension, i.e. be made thinner. Consequently, the hollow piston 2 or a piston machine having this hollow piston 2, in particular
- the supporting and stabilizing function of the center pin 13 is already fulfilled when the center pin 13 extends between the base section 3 and the cover 12, which may be a separate component which is held between the base section 3 and the cover 12.
- the support and stabilization function of the central pin 13 is limited to a compressive stress, since it is only able to transmit compressive stresses due to the lack of connection to the base section 3 and the cover 12.
- Such a center pin 13 would be ineffective in the presence of tensile stresses.
- the tensile forces occurring during the suction stroke in the functional operation of the piston engine are significantly lower than during the pressure stroke, such a center pin 13 in the form of an additional component can also ensure the functionality of the piston engine, since the risk of overloading exists mainly only during a pressure stroke.
- a preferred manufacturing measure for the central pin 13 and the peripheral wall 15 is to produce these parts by cold or hot extrusion. In such a manufacturing process, not only is a higher strength achieved in the material structure of these parts, but 9 U-shaped fiber structures are also created in the material by the extrusion with respect to the bottom of the ring hollow part, whereby the strength of the stability is further increased. Within the scope of the invention, however, it is also possible to manufacture the annular cavity 9 not by cutting but by cutting by deep drilling.
- FIG. 2 differs from the above-described exemplary embodiment in that instead of one, it is in one piece trained center pin 13 a two-piece center pin 13 is provided, which is formed by a pin or a sleeve, which is or in axial holes 12a corresponding cross-sectional size in the base portion 3 and in the cover 12 and is fixed therein, for example by welding, soldering or Glue.
- the exemplary embodiments according to FIGS. 3 to 5 include configurations that improve the sliding bearing of the sliding block 3. These measures make it possible, among other things, to manufacture the body 24 of the sliding shoe 3 from a less slippery material, e.g. from a metal of greater strength, e.g. from steel. On the other hand, it is common to make the slide shoe 3 from copper and zinc alloys, such as e.g. Form brass or bronze. Although these materials have good sliding properties, their strength is relatively low and lower than steel. 3, the hemispherical surface of the joint recess 5 is covered by a sliding material layer 25, e.g. Brass or bronze, lined. This layer 25 extends to the equator 6 of the joint recess 5. If the sliding material layer 25 is thicker than a film, the radial dimension of the recess 5 needs to be increased by the layer thickness.
- a sliding material layer 25 e.g. Brass or bronze
- the slide bearing layer 25 also extends into the region of the recess edge 7.
- the slide bearing layer 25 also extends into the region of the recess edge 7.
- a corresponding slide bearing layer 26 is arranged on the preferably flat foot surface 21 of the slide shoe body 24.
- This sliding material layer 25 can extend over the entire surface of the foot surface 21 or only over partial surfaces, for example in the form of preferably concentric rings. 3 and / or 4 can also be formed in this embodiment.
- the sliding material layer 25, 26 can be a prefabricated material layer which e.g. is attached to the surface carrying it by soldering, welding and gluing, or it can also be a layer application which is applied in a liquid or pasty state and then hardens.
- both the base portion 11 and the end portion or lid 12 can be made with a smaller axial dimension, i.e. thinner, are formed, which both reduces the axial length and saves material and weight.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00951318A EP1248906B1 (de) | 1999-07-21 | 2000-06-29 | Kolbenanordnung für eine kolbenmaschine |
DE50011468T DE50011468D1 (de) | 1999-07-21 | 2000-06-29 | Kolbenanordnung für eine kolbenmaschine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999134217 DE19934217A1 (de) | 1999-07-21 | 1999-07-21 | Kolbenanordnung für eine Kolbenmaschine |
DE19934217.2 | 1999-07-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001007757A2 true WO2001007757A2 (de) | 2001-02-01 |
WO2001007757A3 WO2001007757A3 (de) | 2002-08-01 |
Family
ID=7915558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/006072 WO2001007757A2 (de) | 1999-07-21 | 2000-06-29 | Kolbenanordnung für eine kolbenmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1248906B1 (de) |
DE (2) | DE19934217A1 (de) |
WO (1) | WO2001007757A2 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10306792B4 (de) * | 2003-01-23 | 2007-03-22 | Valeo Compressor Europe Gmbh | Kolben, insbesondere für einen Axialkolben-Verdichter, und Verfahren zur Herstellung desselben |
DE102007008049A1 (de) * | 2007-02-17 | 2008-08-21 | Thyssenkrupp Vdm Gmbh | Gleitender Reibung ausgesetztes Bauteil |
DE102008060841B4 (de) | 2008-12-05 | 2021-10-28 | Robert Bosch Gmbh | Hohlkolben für eine Kolbenmaschine |
EP2466136A1 (de) * | 2010-12-15 | 2012-06-20 | Continental Automotive GmbH | Kolben und Druckpumpe |
DE102011103883A1 (de) * | 2011-06-10 | 2012-12-13 | Robert Bosch Gmbh | Verfahren zur Herstellung eines Kolbens und Kolben für eine Kolbenmaschine |
CN102865221A (zh) * | 2012-10-07 | 2013-01-09 | 四川省宜宾普什驱动有限责任公司 | 一种空心柱塞 |
CH707789A1 (de) | 2013-03-25 | 2014-09-30 | Liebherr Machines Bulle Sa | Kolben für eine Axialkolbenmaschine. |
DE102013211888A1 (de) * | 2013-06-24 | 2014-12-24 | Robert Bosch Gmbh | Hohlkolben für eine Schrägscheibenmaschine und Schrägscheibenmaschine |
CN103711689A (zh) * | 2014-01-09 | 2014-04-09 | 北京理工大学 | 一种空心结构高压液压泵柱塞 |
CH714075A1 (de) | 2017-08-21 | 2019-02-28 | Liebherr Machines Bulle Sa | Verfahren zur Herstellung einer Kugel-Gelenk-Verbindung sowie Kugel-Gelenk-Verbindung. |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3188973A (en) * | 1960-04-14 | 1965-06-15 | Council Scient Ind Res | Hydraulic pumps and motors |
GB1115620A (en) * | 1965-06-14 | 1968-05-29 | Sundstrand Corp | Piston |
DE2364725A1 (de) * | 1973-12-27 | 1975-07-10 | Sundstrand Corp | Kolben, insbesondere zur verwendung in hydraulischen kolbenmotoren und kolbenpumpen, sowie verfahren zu seiner herstellung |
FR2532367A1 (fr) * | 1982-08-24 | 1984-03-02 | Bronzavia Sa | Pompes a pistons axiaux solidaires de patins glissants sur une surface inclinee |
US5553378A (en) * | 1994-09-01 | 1996-09-10 | Sundstrand Corporation | Method of manufacturing a piston |
WO1998042949A1 (de) * | 1997-03-26 | 1998-10-01 | Brueninghaus Hydromatik Gmbh | Verfahren zum herstellen einer kugelgelenkverbindung |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4108786C2 (de) * | 1991-03-18 | 1995-01-05 | Hydromatik Gmbh | Leichtkolben für hydrostatische Axial- und Radialkolbenmaschinen |
US5490446A (en) * | 1994-03-22 | 1996-02-13 | Caterpillar Inc. | Apparatus and method for a piston assembly |
DE19620167C2 (de) * | 1996-05-20 | 1998-11-12 | Brueninghaus Hydromatik Gmbh | Hohlkolben mit radial verschweißtem Deckel |
US5724733A (en) * | 1996-08-08 | 1998-03-10 | Caterpillar Inc. | Method of producing a piston assembly |
-
1999
- 1999-07-21 DE DE1999134217 patent/DE19934217A1/de not_active Withdrawn
-
2000
- 2000-06-29 DE DE50011468T patent/DE50011468D1/de not_active Expired - Lifetime
- 2000-06-29 WO PCT/EP2000/006072 patent/WO2001007757A2/de active IP Right Grant
- 2000-06-29 EP EP00951318A patent/EP1248906B1/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3188973A (en) * | 1960-04-14 | 1965-06-15 | Council Scient Ind Res | Hydraulic pumps and motors |
GB1115620A (en) * | 1965-06-14 | 1968-05-29 | Sundstrand Corp | Piston |
DE2364725A1 (de) * | 1973-12-27 | 1975-07-10 | Sundstrand Corp | Kolben, insbesondere zur verwendung in hydraulischen kolbenmotoren und kolbenpumpen, sowie verfahren zu seiner herstellung |
FR2532367A1 (fr) * | 1982-08-24 | 1984-03-02 | Bronzavia Sa | Pompes a pistons axiaux solidaires de patins glissants sur une surface inclinee |
US5553378A (en) * | 1994-09-01 | 1996-09-10 | Sundstrand Corporation | Method of manufacturing a piston |
WO1998042949A1 (de) * | 1997-03-26 | 1998-10-01 | Brueninghaus Hydromatik Gmbh | Verfahren zum herstellen einer kugelgelenkverbindung |
Also Published As
Publication number | Publication date |
---|---|
DE19934217A1 (de) | 2001-02-01 |
EP1248906A2 (de) | 2002-10-16 |
EP1248906B1 (de) | 2005-10-26 |
WO2001007757A3 (de) | 2002-08-01 |
DE50011468D1 (de) | 2005-12-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0970291B1 (de) | Verfahren zum herstellen einer kugelgelenkverbindung | |
DE10250147B4 (de) | Kugelgelenk | |
EP1198325B1 (de) | Hohlkolben für eine kolbenmaschine und verfahren zum herstellen eines hohlkolbens | |
EP0808988B1 (de) | Hohlkolben mit radial verschweisstem Deckel | |
WO2001007757A2 (de) | Kolbenanordnung für eine kolbenmaschine | |
EP0922868A2 (de) | Axialgelenk | |
DE10341791B4 (de) | Hohlkolben für eine Kolbenmaschine und Verfahren zum Herstellen eines Hohlkolbens | |
DE10109598A1 (de) | Kolben für einen hydrostatischen Zylinderblock | |
DE19934218C2 (de) | Verfahren zum Herstellen einer Kugelgelenkverbindung zwischen einem Gleitschuh und einem Kolben und Axialkolbenmaschine mit einer Kugelgelenkverbindung | |
DE19734217A1 (de) | Verfahren zur Herstellung einer Kolbenanordnung | |
DE10219195C1 (de) | Einstückig ausgebildeter Nocken | |
DE10135489B4 (de) | Kolben mit einem hohlen Kolbenkörper für hydrostatische Einheiten | |
EP1378628B1 (de) | Hohlkolben für eine Kolbenmaschine und Verfahren zum Herstellen eines Hohlkolbens | |
EP0032668A1 (de) | Matrize für Massivumformung im Kalt- oder Halbwarmverfahren | |
DE102017203433A1 (de) | Verfahren zur Herstellung eines Kolbens | |
CH714838A1 (de) | Kolben-Gleitschuh-Einheit für eine Axialkolbenmaschine. | |
DE10332362A1 (de) | Hydraulisches Abstützelement | |
EP1336756A2 (de) | Hohlkolben mit Hohlkugelfüllung | |
EP1225349A2 (de) | Fügeverfahren für eine Kugelgelenkverbindung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2000951318 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10049221 Country of ref document: US |
|
AK | Designated states |
Kind code of ref document: A3 Designated state(s): US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
WWP | Wipo information: published in national office |
Ref document number: 2000951318 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2000951318 Country of ref document: EP |