WO2008074499A1 - Piston creux pour une machine à pistons axiaux - Google Patents

Piston creux pour une machine à pistons axiaux Download PDF

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Publication number
WO2008074499A1
WO2008074499A1 PCT/EP2007/011221 EP2007011221W WO2008074499A1 WO 2008074499 A1 WO2008074499 A1 WO 2008074499A1 EP 2007011221 W EP2007011221 W EP 2007011221W WO 2008074499 A1 WO2008074499 A1 WO 2008074499A1
Authority
WO
WIPO (PCT)
Prior art keywords
hollow piston
main body
piston according
rounding
section
Prior art date
Application number
PCT/EP2007/011221
Other languages
German (de)
English (en)
Inventor
Stefan Hoppe
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2008074499A1 publication Critical patent/WO2008074499A1/fr

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
    • 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 is based on a hollow piston according to the preamble of the main claim.
  • Engine pistons in axial piston machines are subject to a high load, which is caused by centrifugal forces.
  • the solid pistons commonly used in axial piston machines set limits to operation at higher speeds.
  • lightweight pistons are used with cavity, which are produced by welding two items. At present, the inner contour of the prefabrication parts is produced by machining production processes.
  • a lid is applied to the piston main body, which is connected to the main body by various methods.
  • a hollow piston with radially welded lid is known, wherein the hollow piston and the lid are firmly connected to each other by electron beam welding.
  • the inner contour of the hollow piston produced by means of a cutting process has an annular space which is formed between the main body of the piston and a mandrel extending along the longitudinal axis of the main body. At the end of the annular space facing a head portion of the piston, this circular arc-shaped rounded portions make it difficult or impossible to produce this contour by means other than machining methods.
  • the invention is therefore an object of the invention to provide a hollow piston with increased fracture skill.
  • the hollow piston according to the invention with the characterizing feature of the main claim has the advantage that it can be produced by means of a cost-effective method and provides improved material properties and surface quality over the hollow piston produced in the prior art by means of machining process.
  • a strength-optimized Lightweight piston provided for hydrostatic machines, by means of which the disadvantages of the prior art are overcome, as is made possible by the specific inner contour of the hollow piston according to the invention to produce the piston by means of a cold extrusion process, so that machining operations for producing the inner contour are not necessary.
  • the rounding at the end of the annular space facing the head portion of the piston is formed as a first inner profile, which in the cross section of the hollow piston has a first rounded corner between the first end surface of the annular space and the jacket wall of the annular space
  • Main body forms, wherein the rounding of the first corner corresponds to an ellipse section, so that an elliptical rounding profile instead of a circular arc-shaped rounding is formed.
  • This special geometry of the rounding allows for the use of optimized cold extrusion tools and a corresponding optimized cold extrusion process, which is not the case in a circular arc formation of the rounding
  • the radius of the elliptical rounding profile in the axial direction of the hollow cylinder is twice as large as the radius of the elliptical rounding profile in the radial direction of the hollow cylinder, the preferred dimensions for the axial radius being approximately 2.8 mm and for the radial Radius about 1.4 mm.
  • FIG. 1 shows a schematic cross section through an axial piston machine according to the prior art
  • Fig. 2a a erfindunmultien hollow piston
  • FIG. 2b shows an enlarged section of the rounding profile of the hollow piston of Fig. 2a in the area IIb and
  • Fig. 1 shows an axial piston machine 1 according to the prior art.
  • the axial piston machine 1 is designed in swash plate design with adjustable displacement and comprises as essential components a hollow cylindrical housing 2, a housing 1 attached to the terminal block 3, a swash plate 4, a control body 5, a drive shaft 6, a cylinder drum 7, in which the cylinder bores 8, 9 are arranged distributed radially evenly.
  • the hollow pistons 10, 11 slidably disposed, with the ball heads 12, 13 formed rod ends of the hollow piston 10, 11 are supported on the swash plate via sliding shoes 14, 15.
  • the hollow pistons 10, 11 have according to the prior art circular arc-shaped fillets, as indicated by the dashed line.
  • the control body 5 is fixed to the housing interior facing the inner surface of the terminal block 3 and provided with two through openings in the form of kidney-shaped control slots 19, 20 via a pressure channel 21 and suction channel 22 in the terminal block 3 to a pressure or Suction line are connected.
  • the housing interior facing and spherically formed control surface of the control body 5 serves as a bearing surface for the cylinder drum. 7
  • the drive shaft 6 projects through a through hole in the housing end wall 23 in the housing 2 and is rotatably supported by a bearing 24 in this through hole and by means of another bearing 25 in the connection block 3.
  • the cylinder drum 7 is rotatably connected by means of a splined connection 26 with the drive shaft 6.
  • the cylinder bores are provided with mouth channels 27, 28, which open on the same pitch circle as the control slots 19, 20 of the control body 5.
  • a bushing 29, 30 is used in the cylinder bores 8, 9 .
  • Each slide shoe 14, 15 is on its sliding disk 31 of the swash plate 4 facing sliding surface, each with a pressure pocket, not shown provided, via a respective through hole 32, 33 in the shoe 14, 15 connected to a stepped, axial passage 34, 35 in the associated piston 10, 11 and in this way with the piston 10, 11 in the cylinder bore 8, 9 delimited working space connected to the cylinder.
  • a throttle is formed in the region of the associated ball head 12, 13.
  • FIG. 2a shows a hollow piston 10 for hydrostatic machines, in particular for the axial piston machine 1 shown in FIG. 1, according to the invention.
  • the hollow piston 10 is preferably produced by means of a cold extrusion process.
  • the material is made to flow under the action of a high pressure.
  • a stamp presses the workpiece blank by a shaping in the cross-section reduced tool opening - a die. Forming in cold extrusion takes place at room temperature, whereby a high dimensional accuracy and a pronounced high surface quality can be achieved.
  • the hollow piston 10 has a cylindrical main body 36 with a first end portion 37 and a second end portion 38.
  • the cylindrical main body 36 has a length of about 88 mm in this embodiment.
  • a lid 39 is provided at the second end portion 38.
  • the lid 39 is fixedly connected to the second end portion 38 of the cylindrical main body 36, for example, by welding.
  • a connecting portion 40 closes which connects the first end portion of the cylindrical main body 36 with a head portion 41.
  • the head portion 41 is as in the example shown in Fig. 1 designed as a ball head condyle.
  • the cylindrical main body 36 further includes an annular cavity 42 formed between a shell wall 43 of the main body 36 and a mandrel 44 centrally disposed in the main body 36.
  • the annular space 42 has a diameter of about 22 mm in this embodiment.
  • the mandrel 44 extends along a longitudinal axis L of the cylindrical main body 36.
  • the thus formed annular space 42 is defined by the shell wall 43, the mandrel 44 and a first end surface 45 which is adjacent to the connecting portion 40, and a second end surface 46 on the lid 39 , limited.
  • the first end surface 46 faces the second end surface 47.
  • a passage 49 extends through the mandrel 44, the lid 39 and the head portion 41.
  • the passage 49 in the head portion 41 may be provided with a restriction 50. Through the passage 49, a connection between the working volume of the cylinder bores 8, 9 and the through holes 32, 33 in the shoes 14, 15 created.
  • a first inner profile 47 is formed at the first end face 45 and the jacket wall 43.
  • the first inner profile 47 corresponds in cross-section of the piston 10 a first rounded corner, but according to the invention has an elliptical rounding profile instead of a circular arc-shaped rounding ProfiIs, as it is known from The prior art is known.
  • a second inner profile 48 Opposite the first corner 47 is a second inner profile 48 which, in cross-section of the piston 10, corresponds to a second rounded corner 48 between the first end face 45 and the mandrel 44.
  • the rounding is circular arc-shaped with a radius of approximately 1.4 mm. In another embodiment, however, both corners may be formed with elliptical rounding profile.
  • the radius of the elliptical rounding profile in the axial direction of the cylindrical main body 36 is according to the invention about twice as large as the radius of the rounding profile in the radial direction of the main body 36 and in the example is thus approx. 2.8 mm.
  • the axial radius of the elliptical rounding is about 2.8 mm and the radial radius is about 1.4 mm.
  • the radius of the circular arc-shaped rounding is also about 1.4 mm. Since the first inner profile or the first corner 47 is designed with an elliptical rounding profile with the same radial radius but about twice as large axial radius, the manufacturability can be ensured by cold extrusion under this retention of the radial mass.
  • Fig. 3 is an enlarged and schematic view of the elliptical rounding according to the invention is shown. Due to the elliptical rounding not only a production of the hollow piston 10 is made possible by means of cold extrusion, but also a smooth transition from the cylindrical shell wall 43 to the bottom of the hole at the first end surface 45 achieved what to a higher breaking strength leads in particular under radial load. As already mentioned, this design also leads to significantly reduced component load at this point, which reduces the wear of the piston. As can be clearly seen in FIG. 3, the main axis of the ellipse is inclined relative to the longitudinal axis L of the hollow piston 10.
  • the end of the ellipse oriented towards the head section 41 is inclined to the longitudinal axis L by an intermediate angle ⁇ .
  • the intermediate angle ⁇ between the main axis 51 and the longitudinal axis L is less than 45 °, preferably about 30 °. An angle of 30 ° reduces the stress at this point particularly advantageous.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

Piston creux (10) pour une machine à pistons axiaux (1), comprenant un corps principal cylindrique (36) doté d'une première partie terminale (37) et d'une deuxième partie terminale (38). Un couvercle (39) est prévu sur la deuxième partie terminale (38), et une partie de liaison (40) vers une partie de tête (41) est prévue sur la première partie terminale (37). Le corps principal cylindrique (36) présente une cavité annulaire (42) qui est formée entre une paroi d'enveloppe (43) du corps principal (36) et un dôme (44) s'étendant le long d'un axe longitudinal (L) du corps principal (36). La cavité annulaire (42) présente une première face terminale (45) limitrophe de la partie de liaison (40) du corps principal (36), et une deuxième face terminale (46) opposée à la première. Un premier profil intérieur (47) est formé entre la première face terminale (45) de la cavité annulaire (42) et la paroi d'enveloppe (43) du corps principal (36). Le premier profil intérieur (47) est réalisé arrondi, sachant que l'arrondi correspond à un segment d'ellipse, de sorte qu'un profil d'arrondi elliptique est formé.
PCT/EP2007/011221 2006-12-19 2007-12-19 Piston creux pour une machine à pistons axiaux WO2008074499A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006060015.0 2006-12-19
DE200610060015 DE102006060015A1 (de) 2006-12-19 2006-12-19 Hohlkolben für eine Axialkolbenmaschine

Publications (1)

Publication Number Publication Date
WO2008074499A1 true WO2008074499A1 (fr) 2008-06-26

Family

ID=39273132

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/011221 WO2008074499A1 (fr) 2006-12-19 2007-12-19 Piston creux pour une machine à pistons axiaux

Country Status (2)

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DE (1) DE102006060015A1 (fr)
WO (1) WO2008074499A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102155368A (zh) * 2011-05-24 2011-08-17 钱永平 新型高压柱塞泵
US9695454B2 (en) 2012-05-23 2017-07-04 Glykos Finland Oy Production of fucosylated glycoproteins
US9915248B2 (en) 2009-12-03 2018-03-13 Danfoss A/S Hydraulic piston machine, in particular water hydraulic machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017119967A1 (de) 2017-08-31 2019-02-28 Schaeffler Technologies AG & Co. KG Herstellungsverfahren, Kolbenrohling, Kolben sowie Axialkolbenmaschine mit dem Kolben

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB248720A (en) * 1925-03-07 1927-06-10 Gilbert Michel Improvements in and relating to the manufacture of pistons from magnesium and magnesium alloys
GB855582A (en) * 1958-08-27 1960-12-07 Lucas Industries Ltd Plungers for oil pumps or motors of the swash plate type
US3319575A (en) * 1965-06-14 1967-05-16 Sundstrand Corp Piston
DE8509011U1 (de) * 1985-03-26 1986-12-18 Linde Ag, 6200 Wiesbaden Hohlkolben für eine hydrostatische Kolbenmaschine
EP0882640A2 (fr) * 1997-06-06 1998-12-09 KYOHO MACHINE WORKS Ltd. Renforcement pour un élément de structure creux d'un véhicule, avec diminution de l'épaisseur vers les extrémités
DE19934216A1 (de) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Hohlkolben für eine Kolbenmaschine und Verfahren zum Herstellen eines Hohlkolbens
EP1076181A2 (fr) * 1999-08-12 2001-02-14 Brueninghaus Hydromatik Gmbh Piston creux pour machine à pistons alternatifs
WO2005028928A2 (fr) * 2003-09-10 2005-03-31 Brueninghaus Hydromatik Gmbh Piston creux destine a une machine a pistons et procede de fabrication d'un piston creux
DE102004061863A1 (de) * 2004-12-22 2006-07-06 Brueninghaus Hydromatik Gmbh Kolben für Axialkolbenmaschine in Schrägachsenbauweise und Verfahren zur Herstellung solcher Kolben

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB248720A (en) * 1925-03-07 1927-06-10 Gilbert Michel Improvements in and relating to the manufacture of pistons from magnesium and magnesium alloys
GB855582A (en) * 1958-08-27 1960-12-07 Lucas Industries Ltd Plungers for oil pumps or motors of the swash plate type
US3319575A (en) * 1965-06-14 1967-05-16 Sundstrand Corp Piston
DE8509011U1 (de) * 1985-03-26 1986-12-18 Linde Ag, 6200 Wiesbaden Hohlkolben für eine hydrostatische Kolbenmaschine
EP0882640A2 (fr) * 1997-06-06 1998-12-09 KYOHO MACHINE WORKS Ltd. Renforcement pour un élément de structure creux d'un véhicule, avec diminution de l'épaisseur vers les extrémités
DE19934216A1 (de) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Hohlkolben für eine Kolbenmaschine und Verfahren zum Herstellen eines Hohlkolbens
EP1076181A2 (fr) * 1999-08-12 2001-02-14 Brueninghaus Hydromatik Gmbh Piston creux pour machine à pistons alternatifs
WO2005028928A2 (fr) * 2003-09-10 2005-03-31 Brueninghaus Hydromatik Gmbh Piston creux destine a une machine a pistons et procede de fabrication d'un piston creux
DE102004061863A1 (de) * 2004-12-22 2006-07-06 Brueninghaus Hydromatik Gmbh Kolben für Axialkolbenmaschine in Schrägachsenbauweise und Verfahren zur Herstellung solcher Kolben

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9915248B2 (en) 2009-12-03 2018-03-13 Danfoss A/S Hydraulic piston machine, in particular water hydraulic machine
CN102155368A (zh) * 2011-05-24 2011-08-17 钱永平 新型高压柱塞泵
CN102155368B (zh) * 2011-05-24 2014-03-05 钱永平 新型高压柱塞泵
US9695454B2 (en) 2012-05-23 2017-07-04 Glykos Finland Oy Production of fucosylated glycoproteins

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Publication number Publication date
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