EP0309728A2 - Piston pour des machines à piston axial - Google Patents

Piston pour des machines à piston axial Download PDF

Info

Publication number
EP0309728A2
EP0309728A2 EP88113639A EP88113639A EP0309728A2 EP 0309728 A2 EP0309728 A2 EP 0309728A2 EP 88113639 A EP88113639 A EP 88113639A EP 88113639 A EP88113639 A EP 88113639A EP 0309728 A2 EP0309728 A2 EP 0309728A2
Authority
EP
European Patent Office
Prior art keywords
piston
sleeve
light material
piston according
shoulder surfaces
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
EP88113639A
Other languages
German (de)
English (en)
Other versions
EP0309728B1 (fr
EP0309728A3 (en
Inventor
Heinz Berthold
Josef Beck
Ivan Pecnik
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 Hydraulik GmbH
Original Assignee
Brueninghaus Hydraulik 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 Hydraulik GmbH filed Critical Brueninghaus Hydraulik GmbH
Publication of EP0309728A2 publication Critical patent/EP0309728A2/fr
Publication of EP0309728A3 publication Critical patent/EP0309728A3/de
Application granted granted Critical
Publication of EP0309728B1 publication Critical patent/EP0309728B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0082—Details
    • F01B3/0085—Pistons

Definitions

  • the invention relates to a piston according to the preamble of claim 1.
  • a piston of this type is described and shown in U.S. Patent No. 3,187,644.
  • the annular shoulder surfaces are formed by oblique flanks which engage in the cast light material. Due to the presence of inclined flanks, when the materials are obtained, the contraction movements of the hollow body and the light material are compensated in such a way that the contact of the respective oblique flank of the hollow body with the associated oblique flank of the light material is retained. This results in an engagement of the hollow body in the light material, but a firm connection is not guaranteed. Therefore, in the known embodiment, a positive rotation lock is provided for the light material to prevent the light material from being unscrewed from the piston.
  • the invention has for its object to improve the attachment of the light material in the hollow body while ensuring a simple configuration.
  • the annular shoulder surfaces extend essentially perpendicular to the longitudinal axis of the piston, and there is a non-positive connection of the light material on the annular shoulder surfaces.
  • the radial contraction of the cast-in light material when it cools down is harmless and the axial contraction of the light material can come into full effect and bring about the desired connection by tensioning.
  • An additional anti-rotation lock, e.g. additional approximately axially extending shoulder surfaces is not required.
  • the positions of the annular shoulder surfaces deviate from a position perpendicular to the longitudinal axis of the piston, as long as the following condition is fulfilled.
  • Such a deviation is harmless as long as the axial contraction difference between the piston material and the light material is greater than the radial contraction difference, i.e. than the radial dimension by which the relevant shoulder surface of the light material moves away from the associated shoulder surface of the hollow body. If this condition is met, the light material is firmly braced on the at least two annular shoulder surfaces.
  • solid materials are suitable as light materials, the expansion coefficient of which is not significantly smaller than that of the piston material.
  • a light material with an expansion coefficient that is equal to that of the piston material is also suitable, because the desired tension on the shoulder surfaces is also achieved in that the light material is subject to a greater temperature gradient during casting and therefore one in comparison with the contraction of the piston material, greater contraction of the light material takes place.
  • light materials with a larger expansion coefficient than that of the piston material are preferably to be used. Aluminum, magnesium or alloys of these metals and plastics are particularly suitable.
  • the solution according to the invention is functional both with helical shoulder surfaces and / or in a closed ring shape (claims 2 to 4).
  • the developments according to claims 5 to 13 relate to the realization of a longitudinal channel in the piston in order to create a hydrostatic bearing for the piston head.
  • This channel is preferably formed by a sleeve embedded in the light material.
  • the individual design features lead to simple and practicable construction methods, which also enable cost-effective production.
  • the embodiment according to claim 5 enables simple fixing of the sleeve in the position to be cast.
  • the training according to claims 8 to 11 allow in a simple manner the formation of a nozzle or a filter in the longitudinal channel.
  • the piston generally designated 1 has a sack-shaped recess 2 which is open to the end face 3 or to the working surface of the piston 1.
  • the cylindrical recess 2 in the present exemplary embodiment is filled with a light material 4, which is introduced by casting, die casting or forging.
  • a plurality of, in the present exemplary embodiment four, circumferential grooves 5 having an axial spacing from one another are provided in the circumferential wall of the recess 2, of which at least the shoulder surfaces 6 facing away from one another are perpendicular to the axis 7 of the piston 1.
  • Aluminum, magnesium or alloys of these metals or plastic can be used as the light material.
  • the piston 1 is made of steel. Particularly in the case of such a light material 4, which has a larger expansion coefficient than that of the piston material, both radial and axial contraction of the piston 1 and the light material 4 results in the cooling of the materials. In the present exemplary embodiment, the axial contraction of the light material 4 results to the desired tension S. The radial contraction of the light material 4 is harmless because it has no effect on the tension S.
  • the fixation of the light material 4 in the piston 1 according to the invention leads to a positive connection in the axial direction and to a non-positive connection in the radial direction.
  • the light material cannot loosen during the operation of the piston 1 under the loads to be expected and thus do not cause any additional noises or functional problems.
  • the piston 1 has, at its end facing away from its end face 3, a spherical piston head 11 for storage in a correspondingly spherical bearing recess 12, either of a so-called sliding shoe 13, which, with its sliding surface 14 facing away from the piston 1, when using the piston 1 for a Axial piston machine with a plurality of pistons 1 arranged on a pitch circle for the purpose of driving the piston 1 against a swash plate, or directly in a drive disk when using the piston 1 for an inclined axis machine.
  • an axial channel 15 is provided in the piston 1, which opens out on the end face 3 and on the spherical bearing surface 16 of the piston head 11, and through which an oil pressure is applied piston head bearing generally designated 17 (or to the sliding surface 14 of the sliding block 13 through a further channel 15 in the sliding block 13).
  • the end of the sleeve 19 facing away from the end face 3 projects beyond the light material 4, ie this end of the sleeve 19, designated by 21, is inserted in a socket or bore 22 which extends axially from the end of the recess 2 by the dimension b Piston 1 extends into it.
  • a cross-sectional constriction in the form of a nozzle 24 is provided in the sleeve 19, which is preferably formed by a pinch in the region of the nozzle 24. Because of this crushing, further shoulder surfaces 25 or a waist are formed on the sleeve 19, due to which the sleeve 19 is axially secured in the light material due to the embedding.
  • the sleeve 19 can preferably have at its end in the region of the end face 3 a further cross-sectional constriction in the form of a filter gap 26, which can be formed by a pinch on both sides of the sleeve 19 and thereby obtains its gap-shaped cross section.
  • the sleeve 19 projects beyond the end face 3 of the piston 1 by the dimension c, and the filter gap 26 is attached to the free, projecting end of the sleeve 19.
  • Fig. 3 shows the filter gap 26 and the sleeve 19 in a side view from the right.
  • the nozzle 24 is advantageous to arrange the nozzle 24 at a greater distance d from the end face 3 or from the filter gap 26, preferably near its end 21.
  • the embodiment according to FIG. 3 differs from the one described above essentially in that the shoulder surfaces 6 of the piston 1 are formed by a helical spiral groove 27 and an annular groove 5.1, the latter of which, in the present exemplary embodiment, is at the end of the light material facing away from the end face 3 of the piston 1 4 is arranged.
  • This configuration enables inexpensive production and a form-fitting rotation lock for the light material 4 in order to prevent an axial turning out.
  • the further development comprising the sleeve 19 is also not present, but only a simple channel 15 in the form of a bore.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP88113639A 1987-09-28 1988-08-22 Piston pour des machines à piston axial Expired - Lifetime EP0309728B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873732648 DE3732648A1 (de) 1987-09-28 1987-09-28 Kolben fuer axialkolbenmaschinen
DE3732648 1987-09-28

Publications (3)

Publication Number Publication Date
EP0309728A2 true EP0309728A2 (fr) 1989-04-05
EP0309728A3 EP0309728A3 (en) 1989-10-04
EP0309728B1 EP0309728B1 (fr) 1992-09-23

Family

ID=6337053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113639A Expired - Lifetime EP0309728B1 (fr) 1987-09-28 1988-08-22 Piston pour des machines à piston axial

Country Status (3)

Country Link
EP (1) EP0309728B1 (fr)
JP (1) JP2876480B2 (fr)
DE (2) DE3732648A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102086852A (zh) * 2009-12-03 2011-06-08 丹佛斯公司 液压活塞机器,尤其是水压机器

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108786C2 (de) * 1991-03-18 1995-01-05 Hydromatik Gmbh Leichtkolben für hydrostatische Axial- und Radialkolbenmaschinen
DE19706075C2 (de) 1997-02-17 2001-05-17 Brueninghaus Hydromatik Gmbh Kolben für eine hydrostatische Maschine
KR20030062479A (ko) * 2002-01-17 2003-07-28 한라공조주식회사 사판식 압축기용 중공피스톤
JP2008169910A (ja) * 2007-01-11 2008-07-24 Fuji Koki Corp 電動弁
JP4758916B2 (ja) * 2007-01-18 2011-08-31 株式会社不二工機 電動弁
DE102019130844A1 (de) 2019-11-15 2021-05-20 Danfoss A/S Hydraulische Kolbenmaschine
DE102019130843A1 (de) * 2019-11-15 2021-05-20 Danfoss A/S Kolben einer hydraulischen Kolbenmaschine und hydraulische Kolbenmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187644A (en) * 1963-08-19 1965-06-08 Sundstrand Corp Hydraulic pump or motor device pistons
US3633467A (en) * 1968-12-28 1972-01-11 Komatsu Mfg Co Ltd Hydraulic pump or motor device plungers
US3707113A (en) * 1971-02-16 1972-12-26 Caterpillar Tractor Co Piston for hydraulic translating unit
FR2182476A5 (fr) * 1972-04-24 1973-12-07 Eaton Corp
US3915071A (en) * 1972-07-28 1975-10-28 Linde Ag Piston for hydrostatic machines
WO1983003650A1 (fr) * 1982-04-05 1983-10-27 Adomis, Jr., Peter, P. Piston plein pourvu d'un tube central de lubrification

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA985959A (en) * 1972-12-21 1976-03-23 Caterpillar Tractor Co. Piston for hydraulic translating unit
JPS57144349A (en) * 1981-02-27 1982-09-06 Toni:Kk Piston device and caulking tool therefor
DE3204264A1 (de) * 1982-02-08 1983-08-18 Char'kovskij politechničeskij institut imeni V.I. Lenina, Char'kov Mehrteiliger kolben fuer hydraulische verdraengungsmaschinen und verfahren zu dessen herstellung
JPS62215166A (ja) * 1986-03-14 1987-09-21 Taiho Kogyo Co Ltd 複合ピストンおよびその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187644A (en) * 1963-08-19 1965-06-08 Sundstrand Corp Hydraulic pump or motor device pistons
US3633467A (en) * 1968-12-28 1972-01-11 Komatsu Mfg Co Ltd Hydraulic pump or motor device plungers
US3707113A (en) * 1971-02-16 1972-12-26 Caterpillar Tractor Co Piston for hydraulic translating unit
FR2182476A5 (fr) * 1972-04-24 1973-12-07 Eaton Corp
US3915071A (en) * 1972-07-28 1975-10-28 Linde Ag Piston for hydrostatic machines
WO1983003650A1 (fr) * 1982-04-05 1983-10-27 Adomis, Jr., Peter, P. Piston plein pourvu d'un tube central de lubrification

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102086852A (zh) * 2009-12-03 2011-06-08 丹佛斯公司 液压活塞机器,尤其是水压机器
US9915248B2 (en) 2009-12-03 2018-03-13 Danfoss A/S Hydraulic piston machine, in particular water hydraulic machine

Also Published As

Publication number Publication date
JPH01108470A (ja) 1989-04-25
EP0309728B1 (fr) 1992-09-23
DE3732648C2 (fr) 1989-10-19
JP2876480B2 (ja) 1999-03-31
EP0309728A3 (en) 1989-10-04
DE3732648A1 (de) 1989-04-13
DE3874849D1 (de) 1992-10-29

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