US20140150641A1 - Axial piston machine having a conical piston - Google Patents

Axial piston machine having a conical piston Download PDF

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Publication number
US20140150641A1
US20140150641A1 US14/095,295 US201314095295A US2014150641A1 US 20140150641 A1 US20140150641 A1 US 20140150641A1 US 201314095295 A US201314095295 A US 201314095295A US 2014150641 A1 US2014150641 A1 US 2014150641A1
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US
United States
Prior art keywords
piston
section
axial piston
piston machine
machine according
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
US14/095,295
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English (en)
Inventor
Michael Ruckgaber
Rolf Brockerhoff
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: BROCKERHOFF, ROLF, RUCKGABER, MICHAEL
Publication of US20140150641A1 publication Critical patent/US20140150641A1/en
Abandoned 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
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0076—Connection between cylinder barrel and inclined swash plate
    • 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
    • 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
    • F04B1/22—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 having two or more sets of cylinders or pistons
    • F04B1/24—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 having two or more sets of cylinders or pistons inclined to the main shaft axis

Definitions

  • the disclosure relates to an axial piston machine.
  • the DE 23 58 870 B2 has disclosed an axial piston machine of oblique axis construction which can be operated either as a pump or as a motor.
  • the axial piston machine comprises a housing, a drive shaft and a cylinder drum.
  • the drive shaft is mounted in the housing in such a way as to be rotatable with respect to a first axis of rotation by means of a hydrostatic sliding bearing.
  • the cylinder drum is mounted so as to be rotatable with respect to a second axis of rotation, which intersects the first axis of rotation.
  • the angle of inclination between the first and second axes of rotation can be adjusted by means of an adjusting device, wherein the disclosure under consideration can also be used in the case of axial piston machines in which said angle of inclination is fixed.
  • the cylinder drum has a plurality of circular-cylindrical cylinder bores, which are aligned parallel to the second axis of rotation.
  • a piston is accommodated in each cylinder bore in a manner which allows linear motion, said piston being connected at a first end to the drive shaft by means of a ball joint.
  • the ball joint is arranged away from the first axis of rotation on a flange of the drive shaft.
  • the pistons When the drive shaft rotates, the pistons rest against the cylinder bore, giving a rotary drive connection between the drive shaft and the cylinder drum.
  • the pistons have a section in the form of a circular cone which tapers toward the ball joint. This enables the pistons to be tilted relative to the associated cylinder bores, ensuring that they do not jam during the rotation of the drive shaft.
  • the pistons At the second end, that situated opposite the first end, the pistons have a spherical section, by means of which they rest in a substantially sealed manner on the cylinder bore, more specifically in each of the tilted positions thereof. This spherical section is also referred to as a piston land.
  • the section in the form of a circular cone merges without offsets and kinks into the spherical section.
  • this object is achieved by virtue of the fact that the piston has, at the second end, a flat end face, which forms a corner with the spherical section.
  • the length of the piston which projects into the cylinder bore is particularly great.
  • the ratio between the two said lengths determines the magnitude of the supporting forces acting between the piston and the cylinder bore.
  • the increase in said lengths means that said supporting forces are particularly small, thereby reducing wear on the cylinder bore.
  • the end face of the piston is preferably aligned perpendicularly to a center line defined by the conical section.
  • the corner between the end face and the spherical section of the piston can have a radius or a chamfer. This enables the piston to be inserted easily into the cylinder bore during the assembly of the axial piston machine. At the same time, the radius or chamfer do not hinder the tilting movement of the associated piston.
  • the cylinder drum can be composed of cast iron.
  • the wear caused by the piston on the cylinder bore is particularly great, and therefore the minimization according to the disclosure of said wear is particularly advantageous.
  • the use of the following types of materials is preferred: EN-GJS-400-15, EN-GJS-400-18, EN-GJS-500-7 and EN-GJS-600-3
  • the cylinder drum can be produced by casting. As a result, the cylinder drum can be produced at a particularly low cost.
  • the cylinder drum is preferably finish-machined in the region of the cylinder bore to ensure that the surface is particularly smooth and the bore diameter is particularly accurate there.
  • the cylinder bore can have a surface layer which has a greater hardness than the remainder of the cylinder drum.
  • wear can be further minimized
  • Surface layers of this kind typically have a low thickness of, for example, less than 20 ⁇ m.
  • the wear-related abrasion of said surface layer must never be greater than the thickness thereof during the entire operating life of the axial piston machine because the axial piston machine would otherwise suffer excessive wear after a very short time. The minimization according to the disclosure of wear in connection with the surface layer proposed is therefore particularly advantageous.
  • the section of the piston which is in the form of a circular cone can be interrupted adjacent to the spherical section by an encircling first groove, in which a separate first sealing ring is accommodated. It is not possible to completely exclude a small gap between the spherical section of the piston and the cylinder bore. It is for this reason that the seal at that point is supposed to be improved by the first sealing ring.
  • This sealing ring can be designed in accordance with DE 10 2009 018 297 A1, for example. For optimum sealing, it is important that the first sealing ring should be arranged very close to the spherical section of the piston.
  • the first groove must not project into the spherical section since, otherwise, the contact between the spherical section and the cylinder bore would be disrupted. This would result in increased wear on the cylinder bore.
  • the section of the piston which is in the form of a circular cone can be interrupted by an encircling second groove, in which a separate second sealing ring is accommodated, wherein the second sealing ring is arranged on the side of the first sealing ring remote from the spherical section.
  • the width of the spherical section can be between 2 and 8 mm. This width has proven advantageous in tests carried out by the applicant.
  • a spherical head of the ball joint can be arranged on the first end of the piston, wherein the distance between the center of the spherical head and the spherical section of the piston is between 80 mm and 140 mm. This distance has proven advantageous in tests carried out by the applicant. In particular, the overlap between the sealing rings and the cylinder bore for the maintenance of the sealing function in any position of the axial piston machine is assured.
  • FIG. 1 shows a longitudinal section through an axial piston machine according to the disclosure
  • FIG. 2 shows a side view of a piston of the axial piston machine shown in FIG. 1 .
  • FIG. 1 shows a longitudinal section through an axial piston machine 10 according to the disclosure.
  • the axial piston machine 10 comprises a housing 20 , in which a drive shaft 40 is mounted in such a way as to be rotatable with respect to a first axis 41 of rotation.
  • a first rotation bearing 42 in the form of a cylindrical roller bearing and a second rotation bearing 43 in the form of a taper roller bearing is installed between the drive shaft 40 and the housing 20 .
  • a drive journal 44 of the drive shaft 40 projects from the housing 20 and can have a multi-spline shaft profile.
  • a radial shaft sealing ring 45 is arranged between the drive shaft 40 and the housing 20 in the region of the drive journal 44 to ensure that no pressurized fluid, in particular no hydraulic oil, can escape from the axial piston machine 10 there.
  • the drive shaft 40 has a flange 46 .
  • the drive shaft 40 is connected to a plurality of pistons 80 , in each case by means of an associated ball joint 84 .
  • the ball joints 84 are arranged away from the first axis 41 of rotation.
  • a cylinder drum 60 which has a circular-cylindrical cylinder bore 62 for each piston 80 , is furthermore provided.
  • the end face 63 of the cylinder drum remote from the drive shaft 40 has a concave spherical curvature and rests on a matching first end face 31 on a control disk 30 .
  • This engagement between the cylinder drum 60 and the control disk 30 forms a hydrostatic sliding bearing, by means of which the cylinder drum 60 is mounted so as to be rotatable with respect to a second axis 61 of rotation.
  • the second axis 61 of rotation is defined by a separate bearing part 64 , which engages in the flange 46 of the drive shaft 40 by means of a ball joint 65 .
  • the ball joint 65 is arranged at the point of intersection of the first and second axes 41 ; 61 of rotation.
  • the bearing part 64 engages by means of a circular-cylindrical section in a matching circular-cylindrical bore in the cylinder drum 60 , which are arranged concentrically with respect to the second axis 61 of rotation.
  • a spring 66 in particular a helical spring, is installed under preload between the bearing part 64 and the cylinder drum 60 , with the result that the cylinder drum 60 is pressed against the control disk 30 .
  • the path of motion of the control disk 30 is limited by a first and a second end stop 22 ; 23 , which are in the form of screw bolts which are screwed into the housing 20 .
  • FIG. 2 shows a side view of a piston 80 of the axial piston machine shown in FIG. 1 , wherein all the pistons 80 of the axial piston machine are of identical design.
  • the piston 80 has a section 86 in the form of a circular cone which defines a center line 81 of the piston 80 .
  • the section 86 in the form of a circular cone tapers toward a first end 82 of the piston.
  • Arranged at the first end 82 of the piston 80 is the spherical head 85 of the ball joint by means of which the piston 80 is connected to the drive shaft.
  • the center of the spherical head 85 is arranged on the center line 81 .
  • the spherical section 87 of the piston is arranged on the second end 83 of the piston 80 , the end opposite the first end 82 .
  • the sphere diameter of the spherical section 87 corresponds to the bore diameter of the cylinder bore, wherein the center of the sphere is arranged on the center line 81 .
  • the section 86 in the form of a circular cone merges without offsets and kinks into the spherical section 87 .
  • the width 92 of the spherical section 87 is 3 mm, for example.
  • the distance 93 between the spherical section 87 and the center of the spherical head 85 is 99.5 mm, for example.
  • a flat end face 88 which is aligned perpendicularly to the center line 81 , is furthermore provided on the second end 83 of the piston 80 .
  • the end face 88 forms a corner, on which a small radius 89 is provided.
  • the section 86 in the form of a circular cone on the piston 80 is interrupted by a first and a second groove, which are formed in a rotationally symmetrical manner with respect to the center line 81 .
  • a first sealing ring 90 is accommodated in the first groove, wherein a second sealing ring 91 is accommodated in the second groove.
  • the first and/or second sealing ring 90 ; 91 can be designed in accordance with DE 10 2009 018 297 A1, for example, the entire contents of which are incorporated by reference into the present application.
  • the first sealing ring 90 is arranged as close as possible to the spherical section 87 . In the extreme case, that edge of the first groove which is on the right in FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Earth Drilling (AREA)
US14/095,295 2012-12-04 2013-12-03 Axial piston machine having a conical piston Abandoned US20140150641A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012222172.7 2012-12-04
DE102012222172.7A DE102012222172A1 (de) 2012-12-04 2012-12-04 Axialkolbenmaschine mit kegelförmigem Kolben

Publications (1)

Publication Number Publication Date
US20140150641A1 true US20140150641A1 (en) 2014-06-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US14/095,295 Abandoned US20140150641A1 (en) 2012-12-04 2013-12-03 Axial piston machine having a conical piston

Country Status (3)

Country Link
US (1) US20140150641A1 (zh)
CN (1) CN103850905B (zh)
DE (1) DE102012222172A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150377233A1 (en) * 2014-06-30 2015-12-31 Danfoss Power Solutions Gmbh & Co. Ohg Integrated lubrication pump

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014212183A1 (de) * 2014-06-25 2015-12-31 Robert Bosch Gmbh Schrägscheibenmaschine
DE102014212180A1 (de) * 2014-06-25 2015-12-31 Robert Bosch Gmbh Schrägscheibenmaschine
DE102016100920A1 (de) * 2015-11-11 2017-05-11 Linde Hydraulics Gmbh & Co. Kg Hydrostatische Axialkolbenmaschine in Schrägachsenbauweise
FR3063325B1 (fr) * 2017-02-27 2019-03-29 Vianney Rabhi Attelage articule pour dispositif d'etancheite pour piston
DE102019202483A1 (de) * 2019-02-25 2020-08-27 Robert Bosch Gmbh Axialkolbenmaschine mit einstückiger Zählperforation
EP4403770A1 (en) * 2023-01-17 2024-07-24 Hamilton Sundstrand Corporation Piston ball end

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4683810A (en) * 1984-12-13 1987-08-04 Dresser Industries, Inc. Two-stage composite piston
US4951551A (en) * 1987-03-20 1990-08-28 Kabushiki Kaisha Komatsu Seisakusho Variable displacement hydraulic motor
US6279452B1 (en) * 1996-11-27 2001-08-28 Brueninghaus Hydromatik Gmbh Axial piston motor with bearing flushing
US6575130B2 (en) * 1999-04-01 2003-06-10 Vaw Aluminium Ag Light metal cylinder block, method of producing same and device for carrying out the method

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
DE2358870B2 (de) 1973-11-26 1980-02-21 Hydromatik Gmbh, 7900 Ulm Axialkolbenmaschine mit einstuckigem Kolben
DE4429053C1 (de) * 1994-08-16 1995-11-02 Brueninghaus Hydromatik Gmbh Kugelkopf zur Abstützung eines Kolbens einer hydrostatischen Axial- oder Radialkolbenmaschine an deren Hubkörper
DE10216951A1 (de) * 2002-04-17 2003-11-06 Bosch Rexroth Ag Hydrotransformator
SE533152C2 (sv) * 2005-11-24 2010-07-06 Komatsu Ltd Sakai Internat Pat Pump/motor av böjd axeltyp med variabelt deplacement
DE102006045444A1 (de) * 2006-09-26 2008-04-03 Robert Bosch Gmbh Axialkolbenmaschine
ITBS20070094A1 (it) * 2007-07-12 2009-01-13 Omfb S P A Hydraulic Component Pompa ad asse inclinato
DE102009018297A1 (de) 2009-04-21 2010-10-28 Robert Bosch Gmbh Kolbensystem zum Abdichten eines in einem Zylinder geführten Kolbens
CN201433867Y (zh) * 2009-04-24 2010-03-31 上海电气液压气动有限公司 一种轴式液压柱塞泵或马达
DE102009058332B4 (de) * 2009-12-15 2019-11-28 Robert Bosch Gmbh Axialkolbenmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4683810A (en) * 1984-12-13 1987-08-04 Dresser Industries, Inc. Two-stage composite piston
US4951551A (en) * 1987-03-20 1990-08-28 Kabushiki Kaisha Komatsu Seisakusho Variable displacement hydraulic motor
US6279452B1 (en) * 1996-11-27 2001-08-28 Brueninghaus Hydromatik Gmbh Axial piston motor with bearing flushing
US6575130B2 (en) * 1999-04-01 2003-06-10 Vaw Aluminium Ag Light metal cylinder block, method of producing same and device for carrying out the method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150377233A1 (en) * 2014-06-30 2015-12-31 Danfoss Power Solutions Gmbh & Co. Ohg Integrated lubrication pump
US10487826B2 (en) * 2014-06-30 2019-11-26 Danfoss Power Solutions GmbH & Co., OHG Integrated lubrication pump

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Publication number Publication date
CN103850905A (zh) 2014-06-11
DE102012222172A1 (de) 2014-06-05
CN103850905B (zh) 2018-11-13

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RUCKGABER, MICHAEL;BROCKERHOFF, ROLF;SIGNING DATES FROM 20140210 TO 20140214;REEL/FRAME:032638/0783

STCB Information on status: application discontinuation

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