EP1287944A2 - Procédé pour fabriquer un piston creux pour machine à piston - Google Patents

Procédé pour fabriquer un piston creux pour machine à piston Download PDF

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Publication number
EP1287944A2
EP1287944A2 EP02023313A EP02023313A EP1287944A2 EP 1287944 A2 EP1287944 A2 EP 1287944A2 EP 02023313 A EP02023313 A EP 02023313A EP 02023313 A EP02023313 A EP 02023313A EP 1287944 A2 EP1287944 A2 EP 1287944A2
Authority
EP
European Patent Office
Prior art keywords
piston
mandrel
peripheral wall
section
hollow piston
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
Application number
EP02023313A
Other languages
German (de)
English (en)
Other versions
EP1287944A3 (fr
EP1287944B1 (fr
Inventor
Gerhard Beutler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brueninghaus Hydromatik GmbH
Original Assignee
Brueninghaus Hydromatik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brueninghaus Hydromatik GmbH filed Critical Brueninghaus Hydromatik GmbH
Publication of EP1287944A2 publication Critical patent/EP1287944A2/fr
Publication of EP1287944A3 publication Critical patent/EP1287944A3/fr
Application granted granted Critical
Publication of EP1287944B1 publication Critical patent/EP1287944B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49252—Multi-element piston making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49256—Piston making with assembly or composite article making

Definitions

  • the invention relates to a method for manufacturing a hollow piston for a piston machine according to the Preamble of claim 1.
  • a hollow piston according to the preamble of claim 1 is in DE 196 20 167 C2.
  • This previously known Hollow piston exists between the peripheral wall and the central mandrel is a ring hole made by deep drilling is machined. This is a labor and predetermined time-consuming manufacturing effort, by the relatively high manufacturing costs are required.
  • the production of this known Hollow piston also with a relatively high Material loss occurs due to the cutting The ring hole is worked in.
  • this points Hollow piston a ball joint part in the form of a joint ball on, which from the base portion of the hollow piston in the Cavity extends in opposite axial direction.
  • the invention has for its object a hollow piston of the type specified in such a way that at Ensuring a simple or inexpensive Manufacturing, a stable design is achieved, and a to specify the corresponding manufacturing process.
  • the peripheral wall and the central mandrel without cutting to the base section of the Molded hollow piston. This does not only mean that a material loss caused by deep drilling avoided, but also when deep drilling resulting, circumferential grooves in the Inner surface of the peripheral wall and the outer surface avoided the mandrel, making the hollow piston a receives much greater stability because the Circumferential scores significantly reduce that Resistance of the hollow piston against bending loads.
  • the one-piece molding of the peripheral wall and the central mandrel easier to manufacture and perform faster without disposing of the Chips needed.
  • peripheral wall and the to form the central mandrel by extrusion. This will not just a simple and quick transformation reached, but extrusion also result in the Longitudinal direction of the piston directed material fibers, whereby the peripheral wall and the mandrel a particularly large Resistance to bending stresses received and also are basically of great strength, which is also by extrusion due to material and Microstructure compaction is achieved.
  • the peripheral wall and the central mandrel can alternatively also be formed in that these parts with the base section made of sintered material exist and with which between the peripheral wall and the Mandrel extending ring hole are shaped and sintered.
  • This also makes it not just a simple one Achieved inexpensive manufacture, but it can too the advantage can be exploited that a sintered material suitable as a sliding material, which can be attributed to that the pores present in a sintered material Form lubricant pockets that provide good lubrication and a relatively low wear of the sliding surfaces guarantee.
  • a hollow piston according to the invention consists of two pot-shaped blank sections, the shape and Size of their inner shape, i.e. the shape of the cavity halves, are identical. This makes it possible to at least Design of the inner shapes of the hollow pistons same Use tools and manufacturing measures. hereby the manufacturing process is significantly simplified, and it can reduce the manufacturing cost considerably become.
  • the hollow piston generally designated 1 with a cylindrical lateral surface 2 has a base section 3 on, of which there is a joint part in one longitudinal direction 4, a joint ball 5 in the present exemplary embodiment with a ball neck 5a, and in the other longitudinal direction a hollow cylindrical peripheral wall 6 and a cylindrical extend central mandrel 7, which at its the base portion 3 opposite ends through a cover 8 with each other are connected. Between the peripheral wall 6 and the mandrel 7 there is an annular cavity 9 which is closed on all sides is.
  • the End face 11 at the front free end of the hollow piston 1 a frustoconical shape. However, it can also be one have another shape, e.g. a radial plane face his.
  • the hollow piston 1 is made of two or three parts assembled and manufactured, namely a base body part 1a according to FIG. 1a, a cover part 1b according to FIG. 1b and optionally a centering disc 1c according to FIG. 1c.
  • the Base body part 1a and the cover part 1b are for the purpose Further training as a piston blank 1e according to FIG. 1e on a Gap 12 axially placed against each other, which are in Length range of the annular cavity 9 is, where preferably a distance a from the cover 8 and also one Has distance b from the base section 3.
  • annular cavity 9 extends in each case both in the base part 1a and in the cover part 1b, whereby peripheral wall sections 6a, 6b and Mandrel sections 7a, 7b result, which face each other.
  • the centering disc 1c is between the peripheral wall 6b and the mandrel section 7b of the base body part 1a inserted (s. Fig. 1d), with its central hole 13 and her Outside diameter to the cross-sectional size of the mandrel section 7b and the inner diameter of the peripheral wall portion 6b is adjusted.
  • the diameter of the mandrel section 7b may be slightly tapered (not shown) or the Inner diameter of the peripheral wall portion 6b can be slightly expanded, so that in a small axial distance b from the free end of the base part 1a gives a contact shoulder 14 for the centering disc 1c.
  • the centering disc 1c has a through hole 13a, preferably on its outer edge, e.g. a notch on that or through a flow passage between the two the centering disc 1c separate cavity sections guaranteed.
  • the outer diameter of the main body part 1a and Cover part 1b are each with respect to the diameter d of Hollow piston 1 prefabricated with an oversize x.
  • the Base section 3 is on the base body part 1a by an axial Dimension c extended, which is dimensioned so long that the Joint ball 5 with its ball neck 5a are formed therefrom can, e.g. by cutting off.
  • the hollow piston 1 or the base body part 1a and that Cover part 1b exist in the present embodiment Made of metal, especially steel, which is suitable for extrusion suitable.
  • the base body part 1a and the cover part 1b are at Attachment to the surfaces of the division joint 12 by welding connected to each other, preferably by friction welding what by rotating one part relative to the other can be achieved, as is known per se. While of rubbing, the peripheral wall portions 6b and Mandrel section 7b in the area of the dividing joint 12 as strong heated so that they melt in the region of the dividing line 12 and weld them together, being inside and outside Weld beads 15 can form. During the rotation and of welding is in particular the mandrel section 7b supported radially by the centering disc 1c.
  • FIG. 2 in the same or Comparable parts with the same reference numerals shows a piston blank 1e, which differs from above-described embodiment only thereby distinguishes that the parting line 12 more to the free end the peripheral wall 6 is offset, e.g. near the Cover 8 or up to cover 8.
  • the base body part 1a and the cover part 1b are preferably one-piece moldings, d. H. your Are peripheral wall portions 6a, 6b and mandrel portions 7a, 7b each in one piece on the associated base section 3 or Molded lid 8. Preferred measures for this can e.g. Sintering and extrusion, in particular cold extrusion, his.
  • the base part 1a and that Cover part 1b shaped in that the respective sintered material in entered a corresponding cavity of a shape and is sintered.
  • Extrusion takes place in itself known extrusion dies of the appropriate shape, wherein the peripheral wall portion 6b and the Mandrel section 7b and possibly also the Circumferential wall section 6a and the mandrel section 7a each a blank, not shown, formed by extrusion become.
  • the main body part 1a and that Cover part 1b there is a sufficient one Shape accuracy for the main body part 1a and that Cover part 1b, with an additional sintered part good for a sliding function due to im Sintered pores contained in the functional mode act as lubrication pockets.
  • the extrusion gives one in the base area of the cavity 9 adjacent material area u-shaped extending fiber course 16, as shown in FIG. 4.
  • This The course of the fibers also results on the inner surface of the Cavity 9, which in Fig. 6 by longitudinal lines and the reference numeral 16a is clarified.
  • Another advantage is that both of the above Manufacturing measures no material is to be cut to the to achieve the desired shape of the annular cavity 9. The existing material is thus optimally used.
  • Machining can be carried out within the scope of the invention the surface of the piston blank 1d also in several Steps. So it is e.g. possible after Welding and before hardening the final shape of the Hollow piston 1 corresponding shape according to FIG. 1, e.g. by turning or grinding, with an oversize to produce at least on the outer surface 18 and after above-described hardness the entire lateral surface or only the hollow cylindrical surface e.g. by grinding finish, with the joint ball 5 already before Hardening can be finished.
  • FIGS. 7 to 7c differs from the above Embodiment in that the base part 1a and the cover part 1b at least in the area of it Circumferential wall sections 6b and mandrel sections 7b and Cavity sections are identical, preferably also on the outside and thus the same overall design and therefore can be identical parts. Because of the central arrangement of the parting line 12 with respect to the Annular cavity 9 the length of the peripheral wall portions 6a, 6b and mandrel sections 7b is reduced and these parts are more stable due to this reduction Centering disc 1c is omitted, as shown in FIGS. 7 and 7c.
  • this Embodiment is before or after welding the Base body part 1a with the cover part 1b the latter to cut to dimension e in Fig. 7c. hereby a certain loss of material is predetermined, however the advantage is achieved that the base body part 1a and the cover part 1b are at least the same on the cavity side and therefore there is only one device for manufacturing each these parts are needed. This also reduces the Number of different parts, which means that Manufacturing process is simplified overall and the Manufacturing costs can be reduced.
  • the lid part 1b a disc with a central hole 19, in particular one Through hole is formed, which depends on the cross-sectional size the mandrel 7 is adapted, the mandrel 7 in the hole 19 extends into and the peripheral wall 6 to disc-shaped cover part 1b extends.
  • the cover part 1b can be Soldering or welding connected to the base body part 1a e.g.
  • the parts are preferably by laser welding connected with each other. Otherwise, the hollow piston 1 in this embodiment with those already described Establish process steps.
  • the cover part 1b e.g. be integrally formed by sintering, or it can be machined, especially by turning.
  • the hollow piston 1 can with in all embodiments a sliding shoe only indicated in Fig. 1 22, which is connected to the hollow piston 1 by an articulated connection 23 is connected to form a piston assembly 24 which at a Piston machine with a swash plate to move the Hollow piston 1 an axial support and an axial Drive of the hollow piston 1 enables.
  • the slide shoe 22 instructs its side facing the hollow piston 1 hemispherical joint recess 25, whose Recess edge 26 over the equator 27 of the joint recess 25 is also extended and into a joint ball 5 backward form when ensuring a Movement play is flanged.
  • That of the joint recess 25 opposite surface of the slide shoe 22 is one preferably flat sliding surface 28, which for articulated Support on the swash plate is used.
  • the sliding shoe 22 consists of metal, e.g. a copper or brass alloy like bronze, or steel.
  • the recess edge 26 can be cold or warm. This Flaring can be done before finishing the Shell surface 18 of the hollow piston or as the last Processing step after finishing the outer surface 18 of the hollow piston 1 take place.
  • the articulated connection 23 can also be formed in that the joint recess 25 with the Recess edge 26 are arranged on the hollow piston 1 and themselves extend towards the shoe 22, and the Slide shoe 22 has the joint ball 5, which in the Joint recess 25 is pivotally mounted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP02023313A 1999-07-21 2000-06-30 Procédé pour fabriquer un piston creux pour machine à piston Expired - Lifetime EP1287944B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19934216 1999-07-21
DE19934216A DE19934216A1 (de) 1999-07-21 1999-07-21 Hohlkolben für eine Kolbenmaschine und Verfahren zum Herstellen eines Hohlkolbens
EP00943956A EP1198325B1 (fr) 1999-07-21 2000-06-30 Piston creux pour machine a piston et procede pour fabriquer un piston creux

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP00943956A Division EP1198325B1 (fr) 1999-07-21 2000-06-30 Piston creux pour machine a piston et procede pour fabriquer un piston creux
EP00943956.3 Division 2000-06-30

Publications (3)

Publication Number Publication Date
EP1287944A2 true EP1287944A2 (fr) 2003-03-05
EP1287944A3 EP1287944A3 (fr) 2003-04-23
EP1287944B1 EP1287944B1 (fr) 2006-06-07

Family

ID=7915557

Family Applications (3)

Application Number Title Priority Date Filing Date
EP02023313A Expired - Lifetime EP1287944B1 (fr) 1999-07-21 2000-06-30 Procédé pour fabriquer un piston creux pour machine à piston
EP02023312A Expired - Lifetime EP1288495B1 (fr) 1999-07-21 2000-06-30 Piston creux pour machine à piston
EP00943956A Expired - Lifetime EP1198325B1 (fr) 1999-07-21 2000-06-30 Piston creux pour machine a piston et procede pour fabriquer un piston creux

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP02023312A Expired - Lifetime EP1288495B1 (fr) 1999-07-21 2000-06-30 Piston creux pour machine à piston
EP00943956A Expired - Lifetime EP1198325B1 (fr) 1999-07-21 2000-06-30 Piston creux pour machine a piston et procede pour fabriquer un piston creux

Country Status (4)

Country Link
US (1) US6662709B1 (fr)
EP (3) EP1287944B1 (fr)
DE (4) DE19934216A1 (fr)
WO (1) WO2001007201A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102335812A (zh) * 2010-07-20 2012-02-01 台州市百达电器有限公司 一种往复式压缩机活塞的制作方法

Families Citing this family (20)

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Publication number Priority date Publication date Assignee Title
US6314864B1 (en) * 2000-07-20 2001-11-13 Sauer-Danfoss Inc. Closed cavity piston for hydrostatic units
DE10206728B4 (de) † 2002-02-18 2006-08-24 Brueninghaus Hydromatik Gmbh Hohlkolben und Verfahren zu dessen Herstellung durch Sintern
US6732633B1 (en) * 2003-01-14 2004-05-11 Sauer-Danfoss Inc. Reduced dead volume hollow piston
DE10306792B4 (de) * 2003-01-23 2007-03-22 Valeo Compressor Europe Gmbh Kolben, insbesondere für einen Axialkolben-Verdichter, und Verfahren zur Herstellung desselben
US6994014B2 (en) * 2004-06-29 2006-02-07 Sauer-Danfoss Inc. Closed cavity piston for hydrostatic power units and method of manufacturing the same
JP4110479B2 (ja) * 2004-09-28 2008-07-02 アイシン精機株式会社 弁開閉時期制御装置
DE102004061863A1 (de) * 2004-12-22 2006-07-06 Brueninghaus Hydromatik Gmbh Kolben für Axialkolbenmaschine in Schrägachsenbauweise und Verfahren zur Herstellung solcher Kolben
US7313997B2 (en) * 2006-05-26 2008-01-01 Visteon Global Technologies, Inc. Copper alloy piston shoe
US7654240B2 (en) * 2006-08-18 2010-02-02 Caterpillar Inc. Engine piston having an insulating air gap
DE102006060015B4 (de) * 2006-12-19 2025-07-10 Robert Bosch Gmbh Hohlkolben für eine Axialkolbenmaschine
DE102008060841B4 (de) 2008-12-05 2021-10-28 Robert Bosch Gmbh Hohlkolben für eine Kolbenmaschine
DE102009056903A1 (de) 2009-12-03 2011-06-09 Danfoss A/S Hydraulische Kolbenmaschine, insbesondere wasserhydraulische Maschine
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
AU2014270792B2 (en) * 2013-05-22 2017-08-31 Hydac Drive Center Gmbh Axial piston pump having a swash-plate type construction
DE102013211888A1 (de) * 2013-06-24 2014-12-24 Robert Bosch Gmbh Hohlkolben für eine Schrägscheibenmaschine und Schrägscheibenmaschine
DE102017119967A1 (de) * 2017-08-31 2019-02-28 Schaeffler Technologies AG & Co. KG Herstellungsverfahren, Kolbenrohling, Kolben sowie Axialkolbenmaschine mit dem Kolben
JP7228994B2 (ja) * 2018-11-15 2023-02-27 株式会社小松製作所 ピストン及び油圧ポンプ・モータ
CN109926801B (zh) * 2019-04-16 2024-04-09 四川坤成润科技有限公司 一种空芯柱塞的加工方法
CN113878085B (zh) * 2021-10-08 2024-04-26 江苏龙城精锻集团有限公司 一种高压柱塞泵中空柱塞锻件及其一步成形工艺和模具
CN113878086B (zh) * 2021-10-08 2024-04-26 江苏龙城精锻集团有限公司 一种高压柱塞泵中空柱塞锻件及其二步成形工艺和模具

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US3319575A (en) * 1965-06-14 1967-05-16 Sundstrand Corp Piston
DE2653867A1 (de) * 1976-11-26 1978-06-01 Linde Ag Hohlkolben und verfahren zu dessen herstellung
US4494448A (en) 1982-02-23 1985-01-22 Vsesojuzny Nauchno-Issledovatelsky I Proektno-Konstruktorsky Institut Promyshelennykh Gidroprivodov I Girodoavtomatiki Composite piston of positive displacement hydraulic machine and method for manufacturing same
DE3406782A1 (de) 1983-02-25 1984-08-30 Linde Ag, 6200 Wiesbaden Kolben fuer eine hydrostatische maschine
DE4108786C2 (de) * 1991-03-18 1995-01-05 Hydromatik Gmbh Leichtkolben für hydrostatische Axial- und Radialkolbenmaschinen
US5642654A (en) * 1994-09-01 1997-07-01 Sundstrand Corporation Piston and method of manufacturing the same
DE19620167C2 (de) * 1996-05-20 1998-11-12 Brueninghaus Hydromatik Gmbh Hohlkolben mit radial verschweißtem Deckel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102335812A (zh) * 2010-07-20 2012-02-01 台州市百达电器有限公司 一种往复式压缩机活塞的制作方法
CN102335812B (zh) * 2010-07-20 2016-08-03 台州市百达电器有限公司 一种往复式压缩机活塞的制作方法

Also Published As

Publication number Publication date
EP1288495B1 (fr) 2006-05-31
EP1287944A3 (fr) 2003-04-23
US6662709B1 (en) 2003-12-16
DE50003918D1 (de) 2003-11-06
EP1288495A3 (fr) 2003-04-23
WO2001007201A1 (fr) 2001-02-01
EP1198325A1 (fr) 2002-04-24
DE50012944D1 (de) 2006-07-20
EP1288495A2 (fr) 2003-03-05
DE19934216A1 (de) 2001-02-01
EP1287944B1 (fr) 2006-06-07
DE50012872D1 (de) 2006-07-06
EP1198325B1 (fr) 2003-10-01

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