US20150167653A1 - Cylinder Drum of a Hydrostatic Axial Piston Machine having a Wear-Resistant Layer - Google Patents

Cylinder Drum of a Hydrostatic Axial Piston Machine having a Wear-Resistant Layer Download PDF

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Publication number
US20150167653A1
US20150167653A1 US14/571,193 US201414571193A US2015167653A1 US 20150167653 A1 US20150167653 A1 US 20150167653A1 US 201414571193 A US201414571193 A US 201414571193A US 2015167653 A1 US2015167653 A1 US 2015167653A1
Authority
US
United States
Prior art keywords
cylinder drum
wear
layer
resistant layer
cylinder
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.)
Abandoned
Application number
US14/571,193
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English (en)
Inventor
Bernd Gaertner
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
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GAERTNER, BERND
Publication of US20150167653A1 publication Critical patent/US20150167653A1/en
Priority to US15/679,711 priority Critical patent/US10281042B2/en
Abandoned 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1045—Cylinders
    • 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
    • F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
    • F16J10/02—Cylinders designed to receive moving pistons or plungers
    • F16J10/04—Running faces; Liners
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
    • 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
    • F04B1/14—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 having stationary cylinders
    • F04B1/141—Details or component parts
    • F04B1/143—Cylinders
    • 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
    • F04B1/20—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 having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2035—Cylinder barrels
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/0813—Carbides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/14—Self lubricating materials; Solid lubricants

Definitions

  • the disclosure relates to a hydrostatic axial piston machine having a cylinder drum which has a sliding surface and therefore together with another component forms a sliding pair.
  • a cylinder drum rotates in relation to a stationary disk-shaped control or distributor plate.
  • Cylinder (bores) are formed in the cylinder drum, and in these cylinder (bores) pistons perform a lifting movement along a lifting direction directed axially in relation to the axis of rotation of the cylinder drum.
  • a drive shaft to which the pistons are coupled is set obliquely in relation to said lifting direction.
  • a swash plate to which the pistons are coupled is set obliquely in relation to said lifting direction.
  • the cylinders are connected alternately to a high-pressure side and a low-pressure side of the machine via the distributor plate. In this case, for example, the cylinder drum and the pistons guided therein form a sliding pair within the meaning of the present document.
  • EP 1 122 330 B1 and EP 1 122 331 B1 each disclose a method for nitrocarburizing in gas.
  • the document WO/0142528 A1 discloses a method for nitrocarburizing an injection nozzle in a salt bath until a connecting layer has reached a thickness of up to 3 ⁇ m. Thereafter, the injection nozzle is further treated in a gas nitriding method. The aim of this is to keep the connecting layer thin or in gas nitriding to reduce the size thereof again.
  • the cylinder drum is suitable as a component of a hydrostatic axial piston machine and has a wear-resistant layer.
  • the wear-resistant layer is produced by nitrocarburizing in a salt bath or by nitrocarburizing in gas and has a comparatively thin ductile connecting layer, the thickness of which is, for example, 4 to 16 pm.
  • the cylinder drum withstands a higher Hertzian stress compared to embodiments with a wear-resistant layer which has been produced by a conventional nitriding or nitrocarburizing method.
  • the abrasive and adhesive wear resistance is retained in the process.
  • the small changes in dimension make it possible to achieve a relatively high process reliability with low tolerances.
  • the wear-resistant layer is produced by nitrocarburizing in a salt bath and the connecting layer has a thickness of 10 to 16 ⁇ m.
  • the wear-resistant layer is produced by gas nitrocarburizing and the connecting layer has a thickness of 5 to 12 ⁇ m.
  • the wear-resistant layer is produced by nitrocarburizing in a salt bath and the connecting layer has a thickness of 4 to 8 ⁇ m.
  • the cylinder drum is a bushingless swash plate cylinder drum.
  • the cylinder drum is an oblique-axis cylinder drum.
  • the wear-resistant layer has a comparatively thick diffusion layer.
  • the thickness of the diffusion layer can be at least 50 ⁇ m.
  • the wear-resistant layer is produced by gas nitrocarburizing—e.g. according to variant b—it is particularly preferable if this is effected in two stages, the first stage comprising a comparatively low treatment temperature and a comparatively long treatment duration, and the second stage comprising an increase in the carbon content of the connecting layer by the addition of carbon donors at a comparatively high treatment temperature.
  • the carbon content of the connecting layer is increased as a result.
  • the two-stage gas nitrocarburizing makes it possible to achieve reduced changes in dimension of the component and a higher process reliability and a higher operational reliability of the cylinder drum, in particular in the case of components with low tolerances.
  • a carbon donor can already be added in the first stage.
  • FIG. 1 shows a longitudinal section through the cylinder drum according to the disclosure
  • FIG. 2 shows the cylinder drum as shown in FIG. 1 in an elevated view.
  • FIG. 1 shows a cylinder drum 1 of the exemplary embodiment of the axial piston machine according to the disclosure in an oblique-axis construction in a sectional illustration. It has an approximately circular cylindrical shape and, during operation of the axial piston machine, rotates about its longitudinal axis 2 .
  • the cylinder drum 1 has a spherical shape on one end face 4 and is pressed with this end face 4 against a distributor disk.
  • the other end face 6 faces towards a flange of a drive shaft, the cylinder drum 1 being set opposite said flange in the case of a constant-displacement machine and being settable at various angles in relation to said flange in the case of a variable-displacement machine.
  • FIG. 2 shows an elevated view of the end face 6 of the cylinder drum 1 which faces towards the flange or the shaft.
  • a plurality of cylinder bores 8 are introduced on the circumference thereof in a uniformly distributed manner and extend over a large part of the length of the cylinder drum 1 .
  • each cylinder bore has a through bore 10 , via which the cylinder bore 8 is alternately connected to a high-pressure kidney and a low-pressure kidney of the distributor disk as it revolves about the longitudinal axis 2 .
  • a piston is guided in each cylinder bore 8 and is hinged on its side remote from the cylinder drum 1 to the flange, the lifting movement of the piston in the cylinder bore being produced during a joint revolution owing to the oblique position of the flange. Therefore, each piston forms a sliding pairing with the cylinder drum 1 —more precisely with the cylinder bore 8 .
  • the cylinder drum 1 shown in FIGS. 1 and 2 was nitrocarburized in a furnace with gas or in a salt bath after its manufacture.
  • An oxide layer OS, an underlying connecting layer VS and an underlying diffusion layer DS were thereby produced in particular in the region of the lateral surface of the cylinder bore 8 , these layers serving as a wear-resistant layer for the cylinder bore 8 .
  • the connecting layer VS has a thickness of 5 to 12 ⁇ m, while the underlying diffusion layer DS has a thickness of at least 50 ⁇ m.
  • the disclosure discloses a cylinder drum of a hydrostatic axial piston machine, wherein a plurality of cylinder bores, in each of which a piston is moved in a manner subject to intensive wear, are introduced into the cylinder drum.
  • the cylinder bores of the cylinder drum are nitrocarburized in a salt bath or in gas to minimize the wear, a thin uniform connecting layer having a thickness of 4 to 16 ⁇ m and a comparatively thick underlying diffusion layer being provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US14/571,193 2013-12-16 2014-12-15 Cylinder Drum of a Hydrostatic Axial Piston Machine having a Wear-Resistant Layer Abandoned US20150167653A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/679,711 US10281042B2 (en) 2013-12-16 2017-08-17 Cylinder drum of a hydrostatic axial piston machine having a wear-resistant layer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013226091.1 2013-12-16
DE102013226091.1A DE102013226091A1 (de) 2013-12-16 2013-12-16 Zylindertrommel einer hydrostatischen Axialkolbenmaschine mit einer Verschleißschutzschicht

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/679,711 Division US10281042B2 (en) 2013-12-16 2017-08-17 Cylinder drum of a hydrostatic axial piston machine having a wear-resistant layer

Publications (1)

Publication Number Publication Date
US20150167653A1 true US20150167653A1 (en) 2015-06-18

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US14/571,193 Abandoned US20150167653A1 (en) 2013-12-16 2014-12-15 Cylinder Drum of a Hydrostatic Axial Piston Machine having a Wear-Resistant Layer
US15/679,711 Active US10281042B2 (en) 2013-12-16 2017-08-17 Cylinder drum of a hydrostatic axial piston machine having a wear-resistant layer

Family Applications After (1)

Application Number Title Priority Date Filing Date
US15/679,711 Active US10281042B2 (en) 2013-12-16 2017-08-17 Cylinder drum of a hydrostatic axial piston machine having a wear-resistant layer

Country Status (3)

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US (2) US20150167653A1 (zh)
CN (1) CN104712512B (zh)
DE (1) DE102013226091A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9951409B2 (en) 2015-09-30 2018-04-24 Varel International Ind., L.P. Modified surface properties of percussion tools used in downhole drilling

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017205842A1 (de) 2017-04-06 2018-10-11 Robert Bosch Gmbh Zylindertrommel mit Verdrängerkolben und Axialkolbenmaschine mit der Zylindertrommel

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EP0733720A1 (de) * 1995-03-22 1996-09-25 August Bilstein GmbH Oberflächenbehandelte Kolbenstange
US5571341A (en) * 1994-03-16 1996-11-05 Ina Walzlager Schaeffler Kg Thermochemical treatment of thin-walled structural steel elements
US20120048427A1 (en) * 2010-03-16 2012-03-01 Manabu Kubota Steel for nitrocarburizing, nitrocarburized steel part, and producing method of nitrocarburized steel part
CN102758773A (zh) * 2012-06-29 2012-10-31 上海市机械制造工艺研究所有限公司 一种液压变量泵缸体

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DE4027011A1 (de) 1990-08-27 1992-03-05 Degussa Verfahren zur verbesserung der korrosionsbestaendigkeit nitrocarburierter bauteile aus eisenwerkstoffen
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AT3588U1 (de) 1999-12-07 2000-05-25 Steyr Daimler Puch Ag Verfahren zum nitrieren bzw. nitrocarburieren von werkstücken aus legierten stählen
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US5571341A (en) * 1994-03-16 1996-11-05 Ina Walzlager Schaeffler Kg Thermochemical treatment of thin-walled structural steel elements
EP0733720A1 (de) * 1995-03-22 1996-09-25 August Bilstein GmbH Oberflächenbehandelte Kolbenstange
US20120048427A1 (en) * 2010-03-16 2012-03-01 Manabu Kubota Steel for nitrocarburizing, nitrocarburized steel part, and producing method of nitrocarburized steel part
CN102758773A (zh) * 2012-06-29 2012-10-31 上海市机械制造工艺研究所有限公司 一种液压变量泵缸体

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9951409B2 (en) 2015-09-30 2018-04-24 Varel International Ind., L.P. Modified surface properties of percussion tools used in downhole drilling

Also Published As

Publication number Publication date
DE102013226091A1 (de) 2015-06-18
US10281042B2 (en) 2019-05-07
CN104712512A (zh) 2015-06-17
US20170343107A1 (en) 2017-11-30
CN104712512B (zh) 2020-05-15

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GAERTNER, BERND;REEL/FRAME:034951/0333

Effective date: 20150204

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION