WO2012104065A2 - Ensemble piston d'une machine hydraulique à piston - Google Patents

Ensemble piston d'une machine hydraulique à piston Download PDF

Info

Publication number
WO2012104065A2
WO2012104065A2 PCT/EP2012/000424 EP2012000424W WO2012104065A2 WO 2012104065 A2 WO2012104065 A2 WO 2012104065A2 EP 2012000424 W EP2012000424 W EP 2012000424W WO 2012104065 A2 WO2012104065 A2 WO 2012104065A2
Authority
WO
WIPO (PCT)
Prior art keywords
piston
collar
shoe
caulking
plastic
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
Application number
PCT/EP2012/000424
Other languages
German (de)
English (en)
Other versions
WO2012104065A3 (fr
Inventor
Stephan Geise
Carsten Tuechert
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.)
Robert Bosch GmbH
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 WO2012104065A2 publication Critical patent/WO2012104065A2/fr
Publication of WO2012104065A3 publication Critical patent/WO2012104065A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly

Definitions

  • the invention relates to a piston assembly of a hydraulic piston machine with a sliding shoe made of plastic according to the preamble of patent claim 1 and a method for manufacturing the piston assembly, according to the preamble of
  • a hydraulic piston machine has a piston assembly with a working piston and a non-ferrous metal or steel sliding shoe attached thereto.
  • the working piston is supported on the slide shoe on a sliding surface of a swash plate.
  • a disadvantage of the method is that the molded plastic tends to adhere to the metallic working piston.
  • the invention is based on the object to provide a cost-effective piston assembly for a hydraulic piston engine with a sliding shoe made of plastic.
  • the piston assembly according to the invention for a hydraulic piston machine has a piston and a sliding shoe, which consists of plastic.
  • the sliding shoe has a sliding surface, via which it can be supported on a support surface of the hydraulic piston machine.
  • the piston is rotatably or pivotally connected to the sliding shoe via a joint which is formed by a piston foot and a joint mount arranged on the sliding shoe.
  • the piston foot on a taper, which is engaged behind by a collar of the joint receptacle.
  • the collar is caulked towards the taper.
  • the collar has been caulked warm in the heated state.
  • the plastic shoe is lighter than the metal and therefore saves weight. At the same time, the material costs are much lower compared to non-ferrous metals.
  • PEEK polyetheretherketone
  • thermoplastic material is reinforced with at least one filler.
  • this has at least one approximately axially disposed slot. So are avoided from the caulking resulting unwanted accumulation of material in the collar.
  • the piston is spherical and form-fitting of the
  • the joint receptacle is thus preferably formed hollow spherical.
  • the fit the entrainment of the shoe during the suction stroke of the piston is further improved.
  • a contact pressure of the shoe to the support surface of the piston engine and wear between the shoe and the support surface of the piston and the shoe is penetrated by a pressure medium channel, which opens into the sliding surface.
  • pressure medium is passed into a space between the shoe and the support surface, whereby the shoe is hydrostatically relieved.
  • the method for manufacturing a piston assembly according to the invention comprises according to the invention the step "caulking the collar of the joint receptacle towards the taper of the piston foot", whereby the piston assembly can be produced by a procedural low-cost and favorable step.
  • the collar is preferably caulked by pressing at least one jaw or a heating jaw of a tool for rejuvenation.
  • the step of heating is carried out in a preferred embodiment of the method either by infrared irradiation of the collar, or by heat conduction from a heating jaw of a tool towards the collar.
  • the cooling down step takes place
  • the heating jaw is preferably heated by applying a voltage or by magnetic induction.
  • the magnetic induction proves to be a fast and safe method for heating the heating jaw. It is particularly preferred if, in a process step preceded by caulking, the sliding shoe is formed by injection molding via a single step, whereby a high number of sliding shoes can be produced at low unit costs in a short time. The shoes do not have to be cut individually to your final contour, but fall urgeformt from the injection mold. Post-processing is minimized.
  • the bore can be made with a special plastic drill or a plastic drill suitable for plastics, for example a C02 laser, a Nd: YAG or excimer laser, which leaves no plastic particles or glass fibers behind.
  • Figure 1 shows an embodiment of a piston assembly in a longitudinal section
  • Figure 2 shows a first embodiment of a method for manufacturing the
  • Figure 3 shows a second embodiment of a method for manufacturing the
  • Figure 4 shows a third embodiment of a method for manufacturing the
  • FIG. 1 shows an embodiment of a piston arrangement 1 according to the invention in a longitudinal section.
  • the piston assembly 1 has a piston 2, which is only partially shown, and a shoe 4.
  • the shoe is made of the thermoplastic PEEK in an injection molding process.
  • the sliding shoe 4 has a sliding surface 6, via which it is supported on a sliding surface of a swashplate of a swashplate-type axial piston machine (not shown).
  • the sliding shoe 4 has a circumferential radial
  • the piston 2 has a piston foot 10, which is received in a form-fitting manner in a joint receptacle 12 of the sliding shoe 4.
  • the piston foot is spherical in shape, the joint receptacle 12 accordingly as well.
  • the piston foot has at a portion where it is connected to the piston 2, a taper 14 which is engaged behind by a collar 16 of the shoe 4.
  • the collar is inventively heat stiffened by means of heat conduction towards the taper 14.
  • the piston foot has an axial flattening 26 at its end portion, so that upon pivoting of the piston 2 from an axis Z, the pressure medium connection between the sliding surface 6 and the bore 18 is not interrupted.
  • the piston 10 is bordered in the shoe 4 with a very small game.
  • Figure 2 shows a first embodiment of a method for manufacturing the
  • a first step of injection molding A takes place in an injection mold 130, which is designed as a multi-cavity mold and preferably with a hot runner system is operated.
  • the sliding shoe 4 is molded in the injection mold 130 from a reinforced with fillers thermoplastic polyetheretherketone (PEEK).
  • the through-bore 22 is for this purpose with a special plastic drill or a CO2 laser drill 132, which leaves no plastic particles or glass fibers produced.
  • the fixed sliding block 4 is supplied to a caulking device 134, in which it is joined to the piston 2.
  • the piston 10 is fixed vertically in the joint seat 12.
  • the projecting collar 16 of the shoe 4, which is provided with slots (covered by the piston 2) is caulked by 3 lateral heating jaws 136 (only two visible) to the taper 14 towards warm.
  • the heating jaws 136 are made of steel and in the vicinity of the collar 16 cooling channels 138 are introduced. Through this, a cooling medium is introduced after the hot caulking of the collar 16 to cool the plastic in the caulked position. Since a contact force of the heating jaws, which now have cooling function, is withdrawn only after cooling, springback of the collar can be prevented. A brought into contact with the collar 16 surface of the heating jaws 136 is provided with a non-stick coating, so that the plastic can not adhere.
  • the hot caulking of the protruding collar can still be carried out by alternative heating methods. Two preferred methods are shown in FIGS. 3 and 4.
  • Figure 3 shows a second embodiment of a method for manufacturing the piston assembly 1. Shown is the heating of the collar 16 by irradiation with Infrared radiation of an infrared radiation source 240, in which the collar 16 of the shoe 4 can be heated in a very short time. As soon as the softening temperature of the plastic is reached, contour-adapted jaws 237 of a caulking device 234 press the collar 16 against the taper 14 of the piston foot 10. At the same time, the infrared radiation is switched off. The jaws 237 rapidly cool by convection of airflow and the plastic of the collar 16 solidifies in the new position.
  • FIG. 4 shows a third exemplary embodiment of a method for producing the piston assembly 1. Shown is the heating of the collar 16 by contour-matched heating jaws 336, which are heated by induction. A copper inductor 342 heats up the heating jaws 336 in just a few seconds. As soon as the heating jaws 336 have reached the softening temperature of the plastic, springs 344 press the heating jaws 336 and these push the collar 16 against the taper 14 of the piston foot 10. At the same time, the induction is switched off. The Hetzbacken 336 quickly cooled by an air purge and the plastic solidifies in the new position.
  • the through-bore 22 can be drilled with an Nd: YAG or excimer laser, or with a special plastic drill.
  • possible heating methods are convection by means of hot gas, laser heating, as well as internal and external friction by means of ultrasound, rotation or vibration.
  • a piston assembly for a hydraulic piston machine with a piston and with a sliding shoe made of plastic wherein a piston base and arranged on the sliding shoe pivot receptacle form a joint and the piston foot has a taper which is engaged behind by a collar of the joint receptacle.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne un ensemble piston pour une machine hydraulique à piston comprenant un piston et un patin qui est réalisé en matière plastique, la base du piston et un logement d'articulation disposé dans le patin formant ensemble une articulation. La base du piston présente un effilement sur lequel vient se plaquer un col du logement d'articulation. Selon l'invention, le col est soumis à un matage vers l'effilement. L'invention concerne également un procédé de production de l'ensemble piston.
PCT/EP2012/000424 2011-02-04 2012-02-01 Ensemble piston d'une machine hydraulique à piston Ceased WO2012104065A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011010296.5 2011-02-04
DE201110010296 DE102011010296A1 (de) 2011-02-04 2011-02-04 Kolbenanordnung einer hydraulischen Kolbenmaschine

Publications (2)

Publication Number Publication Date
WO2012104065A2 true WO2012104065A2 (fr) 2012-08-09
WO2012104065A3 WO2012104065A3 (fr) 2013-04-25

Family

ID=45569549

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/000424 Ceased WO2012104065A2 (fr) 2011-02-04 2012-02-01 Ensemble piston d'une machine hydraulique à piston

Country Status (2)

Country Link
DE (1) DE102011010296A1 (fr)
WO (1) WO2012104065A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10339791B2 (en) 2007-06-12 2019-07-02 Icontrol Networks, Inc. Security network integrated with premise security system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109253078A (zh) * 2018-11-27 2019-01-22 中国航发贵州红林航空动力控制科技有限公司 一种滑靴结构及其加工工艺

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1068078A (en) * 1964-10-12 1967-05-10 Boulton Aircraft Ltd Reciprocating pistons for pumps and motors
GB1156655A (en) * 1965-07-10 1969-07-02 Plessey Co Ltd Improvements in or relating to Swash Plate Pumps
JPH0712050A (ja) * 1993-06-14 1995-01-17 Toyota Autom Loom Works Ltd ワッブル型圧縮機のピストンロッド連結構造及び連結方法
US6183212B1 (en) 1999-02-17 2001-02-06 Stanadyne Automotive Corp. Snap-in connection for pumping plunger sliding shoes
DE102004060945A1 (de) 2004-12-17 2006-07-06 Bosch Rexroth Aktiengesellschaft Kolbenanordnung einer hydraulischen Kolbenmaschine
DE102008038767A1 (de) 2008-08-12 2010-02-18 Robert Bosch Gmbh Kolbeneinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10339791B2 (en) 2007-06-12 2019-07-02 Icontrol Networks, Inc. Security network integrated with premise security system

Also Published As

Publication number Publication date
DE102011010296A1 (de) 2012-08-09
WO2012104065A3 (fr) 2013-04-25

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