EP1944510A1 - Machine à piston avec cylindre pivotable - Google Patents

Machine à piston avec cylindre pivotable Download PDF

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Publication number
EP1944510A1
EP1944510A1 EP07120753A EP07120753A EP1944510A1 EP 1944510 A1 EP1944510 A1 EP 1944510A1 EP 07120753 A EP07120753 A EP 07120753A EP 07120753 A EP07120753 A EP 07120753A EP 1944510 A1 EP1944510 A1 EP 1944510A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston engine
engine according
spring element
cylinder sleeve
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.)
Withdrawn
Application number
EP07120753A
Other languages
German (de)
English (en)
Inventor
Jörg Dantlgraber
Josef BÜDEL
Heino Försterling
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 EP1944510A1 publication Critical patent/EP1944510A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04B1/2092—Means for connecting rotating cylinder barrels and rotating inclined swash plates
    • 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
    • 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
    • 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 invention relates to a piston engine according to the preamble of patent claim 1.
  • Such, designed as an axial piston piston machine is, for example, from the post-published DE 10 2005 056 631.6 known.
  • This conventional solution has two approximately in the axial direction oppositely directed rows of pistons, which are in operative connection with one of a swash plate frontally supported cylinder drum, which has a plurality of pivotally mounted and supported on an end face of a drum base of the cylinder barrel cylinder sleeves.
  • the rows of pistons each consist of a plurality of pistons, which are each received in a cylindrical sleeve of the cylinder drums relative to axially displaceable and connected to a shaft which acts as a drive or output shaft depending on the design of the axial piston machine.
  • the rotation of the pistons about the shaft axis and a corresponding pivoting or wobbling movement of the cylinder drums results in a transverse movement between the pistons and the cylinder drums, made possible by the end faces of the drum base being provided with spherical protrusions as bearing seat elements are, on each of which one of the cylinder sleeves is supported on the foot side, so that the cylinder sleeves are pivotally mounted with respect to the swash plate.
  • the cylinder sleeves are biased by spring elements, which act against the sealing points opposite flat surfaces of the cylinder sleeves, sealingly against the spherical projections of the drum base.
  • a disadvantage of such reciprocating engines is that between the cylinder sleeves and acting on the flat surfaces of the cylinder sleeves spring elements, a sliding movement can occur, causing friction losses and affects the pivoting or tumbling motion of the cylinder sleeves.
  • a further disadvantage is that a tilting moment can occur which leads to tilting of the cylinder sleeves from the bearing seat elements and thereby to a pressure medium leakage and to a deteriorated volumetric efficiency of the piston engine. It has also been shown that in such solutions no constant contact pressure can be achieved.
  • the present invention seeks to provide a piston engine, in which with minimal manufacturing effort a constant mechanical contact / bias of the cylinder sleeves is achieved against the crowned bearing seat elements without hindering the pivoting or tumbling motion of the cylinder sleeves.
  • the piston engine according to the invention has at least one pivotally mounted cylinder sleeve, in which a piston is immersed, which is operatively connected to a drive / output shaft, wherein the cylinder sleeve is biased by at least one spring element against a bearing seat member.
  • the spring element is pivotable in accordance with the movement of the cylinder sleeve.
  • This solution has the advantage that the pivoting or wobbling movement of the cylinder sleeves by the spring elements (hold-down springs) is not affected, since the spring elements over the prior art according to the DE 10 2005 056 631.6 are pivotable, so that a sliding movement between the cylinder sleeves and the spring elements and a tilting moment of the cylinder sleeves is avoided on the bearing seat elements or at least greatly reduced. Furthermore, due to the pivotable spring elements a centric, substantially constant contact force the cylinder sleeves against the bearing seat member and thus achieves a high sealing effect at static spring load and significantly reduced friction.
  • this is designed as an axial piston machine with at least one swash plate, on each of which a cylinder drum is supported, which has a plurality of pivotally mounted on an articulated or spherical projections end face of a drum base of the cylinder drum supported cylindrical sleeves in which piston are guided, which are operatively connected to a drive / output shaft, wherein the cylinder sleeves are biased by at least one spring element against a respective hinge element, such as a ball screw, or a convex projection of the drum base.
  • a respective hinge element such as a ball screw, or a convex projection of the drum base.
  • the spring element engages with a first end portion of an inner circumferential groove of the cylinder sleeve and is supported with a second end portion of the cylinder barrel, so that the cylinder sleeves are biased against a respective hinge element or a convex projection of the drum base.
  • the spring element engages via spring legs in the inner circumferential groove of the cylinder sleeve.
  • the spring legs each have an axial section extending approximately in the axial direction, which merges into a radial section bent outwards and back to the inner circumferential groove.
  • the spring element has three or five spring legs, which are arranged approximately crown-shaped and engage in the inner circumferential groove. Due to the three or five spring legs is a statically certain support of the cylinder sleeve on the hinge element or the projection of the drum base and thereby achieved a high Abkipp. With minimal manufacturing effort.
  • Such a spring element can be particularly advantageous in terms of production as a sheet metal bent part.
  • the second end portion of the spring element for articulated mounting of the spring element is at least partially spherical, so that the spring element with the cylinder sleeve is pivotable.
  • an engaging on the cylinder sleeve end portion of the spring element is connected via a flexible tensile element, preferably a wire, with an attacking on the cylinder drum end portion.
  • a flexible tensile element preferably a wire
  • the pivoting movement of the upper part is made possible by the flexurally soft tension element.
  • the lower part of the spring element may be stationary or articulated relative to the drum base or the ball head in this solution.
  • the flexurally soft tensioning element extends substantially along the longitudinal axis of the spring element.
  • the spring element preferably extends into the joint element and is connected via this with the cylinder drum.
  • a ball screw is used, which is screwed into a receptacle of the cylinder drum, wherein an end portion of the spring element between the ball screw and the cylinder drum axially fixed but is pivotally mounted.
  • the cylinder sleeves are each prestressed against the bearing seat element by means of at least one tension spring, for example a helical spring.
  • the spring element passes through the cylinder drum at least in sections and is connected to the rear side with this.
  • the spring element engages in the region of a sealing portion on the cylinder sleeve, so that any tilting moment that may occur is further reduced and tilting of the cylinder sleeves from the bearing seat elements is prevented.
  • the spring element is arranged in the cylinder sleeve such that the cylinder sleeve and the spring element extend substantially along a common longitudinal axis.
  • the hinge elements or the convex projections dip into the cylinder sleeves in sections. It is advantageous if the cylinder sleeves are spaced from an end face of the drum base, so that the cylinder sleeves do not accumulate on a pivoting movement on this surface. In the same level with the drum level plane lying sealing level, the distance can also be achieved by an annular groove (concentric with the sleeve / Kugelkopfachse) in the drum disc.
  • the spherical projections bound with their surfaces at least partially cylinder chambers of the cylinder sleeves.
  • the joint elements or the convex projections each have a bore open towards the cylinder space, which opens into an opening of the drum base, which can be brought into coincidence with controlling the swash plates ,
  • the spring elements form a flow cross-section.
  • FIG. 1 shows a longitudinal section through a designed as an axial piston piston engine according to the invention 1, which can be operated both as a hydraulic motor and as a pump.
  • the axial piston machine 1 has a housing 2 indicated by dashed lines, on which a suction port, not shown, and a pressure port (not shown) are formed.
  • the housing 2 is designed in several parts and has two covers 4, 6, between which a sleeve-shaped middle part 8 is clamped to limit an interior 10.
  • the interior 10 is penetrated by a drive shaft 12 which is mounted in the housing 2 via a roller bearing 14, which is inserted into an inner bore 16 of the lid 4, and by a roller bearing 18 which is arranged in an inner bore 20 of the lid 6 , A protruding from the housing 2 free end portion 22 of the drive shaft 12 is connectable to a drive motor, not shown.
  • a drive motor not shown.
  • two swash plates 24, 26, each with an obliquely to the shaft axis W of the drive shaft 12 extending support surface 28, 30 are arranged.
  • cylinder drum 32, 34 On each of these is mounted on the drive shaft 12 cylinder drum 32, 34 supported, which has a plurality of cylinder sleeves 36, 38, in each of which a piston 40, 42 of a piston row 44, 46 is immersed.
  • the cylinder drums 32, 34 are pivotally mounted on the drive shaft 12, so that due to their inclination during a rotation of the drive shaft 12, a wobbling motion is effected.
  • the cylinder drums 32, 34 are each driven by two engaging on a casing part 48, 50 of the cylinder drums 32, 34 driving pins 52 in the direction of rotation, each in a ball bearing portion 54, 56 of the drive shaft 12 passing through transverse bore 58, 60 are inserted in sections.
  • the cylinder drums 32, 34 are each supported by a drum bottom 62, 64 on the respective support surface 28, 30, wherein they by means of a tension spring 66, 68, between each one on the bearing portion 54, 56 pivotable support ring 70, 72 and a in an inner peripheral groove 74, 76 of the drum base 62, 64 received circlip 78, 80 extends, are biased against the respective support surface 28, 30.
  • the swash plates 24, 26 are symmetrical to in FIG. 1 arranged vertically extending center plane M, wherein the support surfaces 28, 30 are each inclined to the center plane M.
  • the pistons 42 have a substantially conical shape and form with the piston 40 respectively end portions of a double piston 82 facing away from each other, which is screwed with a central portion 84 in a threaded bore 86 of a radially projecting drive flange 88 of the drive shaft 12.
  • the depth of engagement of the central portion 84 is limited by a radial shoulder 90 of the double piston 82, which rests in the end position with a shoulder surface 92 frontally on the drive flange 88. Further details of the axial piston machine 1 are based on the detailed representation of the cylinder drum 34 in FIG. 2 explained.
  • each of the pistons 42 is spaced from the central portion 84 (see FIG. 1 ) extending shank 94, which with a conical piston head 96 in a cylinder bore 98 of the cylinder sleeves 38th dips and sealingly abuts a peripheral wall 100 of the cylinder sleeves 38 and a cylinder space 102 limited.
  • a kelchartiger to the cylinder chamber 102 toward the open piston chamber 104 is each frontally formed, which merges into a provided with an internal thread 106 blind bore 108 and allows the piston head 96 can be acted upon in a compression stroke with high pressure, so that it geometrically to which can be adapted radially expanding cylinder sleeve 38 during a compression stroke of the piston 42 and thus sealingly abuts the peripheral wall 100 of the cylinder sleeves 38 in each working position.
  • an insert 110 can be inserted into the piston chamber 104, which is secured by a screw 112 passing through it and being in operative engagement with the internal thread 106.
  • the insert 110 has a gap so that the piston head 96 can radially expand during a compression stroke to prevent leakage.
  • the cylinder sleeves 38 are biased via a sealing portion 114 by means of a spring element 116 against each one, as in a stepped bore 118 of the cylinder barrel 34 screwed ball screw 120 formed bearing seat member of the drum base 64. In a variant of the invention, not shown, the cylinder sleeves 38 are biased against a convex projection of the drum bottom 64.
  • the spring element 116 engages with a dipping into the cylinder sleeve portion 122 at this 122 and is pivotally mounted according to the movement of the cylinder sleeve 38.
  • the pivoting or tumbling motion of the cylinder sleeves 38 is substantially unaffected by the spring elements 116, so that a sliding movement between the cylinder sleeves 38 and the spring elements 116 and a tilting moment of the cylinder sleeves 38 on the ball screws 120 avoided or at least greatly reduced. Due to the pivotally mounted spring elements 116 a centric, substantially constant contact force of the cylinder sleeves 38 against the ball screws 120 and thus a high sealing effect at substantially reduced friction is further achieved.
  • the spring elements 116 are loaded only statically, since these according to the sleeve movement a pivoting movement To run.
  • the spring element 116 engages in the illustrated embodiment with the first end portion 122 at an inner circumferential groove 124 of the cylinder sleeve 38 and is attached via a second end portion 126 to the cylinder barrel 34, so that the cylinder sleeve 38 is biased against the ball screw 120.
  • the spring element 116 engages via spring legs 128 in the inner circumferential groove 124 of the cylinder sleeve 38 having an axially extending axial portion 130 which extends at a distance through a through hole 131 of the ball screw 120 and into a bent outwardly and back to the inner circumferential groove 124 radial portion 132nd passes.
  • the spring element 116 has five spring legs 128, which are approximately crown-shaped and engage in the inner circumferential groove 124. Due to the five spring legs 128, a statically determined support of the cylinder sleeve 38 and thereby a high Abkipphow achieved with minimal manufacturing effort.
  • the inner circumferential groove 124 is formed in the region of the sealing portion 114 of the cylinder sleeve 38, so that a possibly occurring tilting moment is further reduced and tilting of the cylinder sleeves 38 is prevented.
  • the spring element 116 extends through the ball screw 120 into a space 134 and is connected via this to the drum base 64, wherein the end portion 126 of the spring element 116 to its articulated mounting partially spherical with spherical segments 136 and between a corresponding recess 138 of the ball screw 120th and the drum base 64 is arranged positively but pivotally.
  • the spring element 116 is arranged in the cylinder sleeve 38 such that the cylinder sleeve 38 and the spring element 116 substantially extend along a common longitudinal axis 140. Such a spring element 116 is particularly advantageous in one piece as sheet metal part produced.
  • the cylinder sleeves 38 are each biased by means of at least one tension spring, such as a coil spring, against the ball screw.
  • FIG. 3 is a detailed illustration of an axial piston machine 1 according to another embodiment of the invention shown that differs from the above-described embodiment essentially in that the engaging on the cylinder sleeve 38 end portion 122 of the spring element 116 via a flexurally soft tension member 146 with the cylinder drum 34 and the Bearing seat member 120 engaging end portion 126 is connected.
  • the bending-soft tension element 146 is formed in the illustrated embodiment as a wire, which engages over a respective transverse strut 148, 150 on a cylinder sleeve 152 of the upper part 122 or the ball segments 136 of the lower part 126 and the pivoting movement of the upper part 122 allows.
  • the cylinder sleeve 152 and the ball segments 136 allow a sufficiently large flow cross-section of the spring element 116. It has proven to be particularly advantageous if the flexurally soft tension element 146 extends along the longitudinal axis 140 of the spring element 116. As a result, a centric contact force of the cylinder sleeves 38 against the bearing seat element 120 and thus a high sealing effect is achieved.
  • the lower part 126 of the spring element 116 is according to FIG. 3 articulated relative to the cylinder drum 34. Since in this variant, a pivoting movement of the upper part 122 is made possible by the flexurally soft tensioning element 146, the lower part 126 in an embodiment, not shown, of the spring element 116, however, also be stationary relative to the cylindrical drum 34.
  • the ball screws 120 are respectively penetrated by the cylinder chamber 102 to open hole 118, which opens into an opening 142 of the drum bottom 64, so that, as shown , the bore 118 is extended through the drum bottom 64 and can be brought into overlap with unillustrated control kidneys of the swash plate 26, so that in dependence on the rotational position (inner, outer dead center) of the cylinder drum 34 made a connection with the suction or the pressure port is to nachzusaugen pressure medium in the cylinder chamber 102 or with High pressure pressurized fluid to lead to a consumer.
  • the spring elements 116 form a flow cross-section.
  • the cylinder sleeves 38 are at the foot side spaced from an end face 144 of the drum base 64, so that the cylinder sleeves 38 do not accumulate on a transverse movement and are lifted from the ball screws 120.
  • a piston engine 1 with at least one pivotally mounted cylinder sleeve 36, 38 in which a piston 40, 42 is immersed, which is operatively connected to a drive / output shaft 12, wherein the cylinder sleeve 36, 38 by means of at least one spring element 116 against a bearing seat member 120 is biased.
  • the spring element 116 is pivotable in accordance with the movement of the cylinder sleeve 36, 38.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP07120753A 2007-01-05 2007-11-15 Machine à piston avec cylindre pivotable Withdrawn EP1944510A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710001795 DE102007001795A1 (de) 2007-01-05 2007-01-05 Kolbenmaschine

Publications (1)

Publication Number Publication Date
EP1944510A1 true EP1944510A1 (fr) 2008-07-16

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ID=39201898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07120753A Withdrawn EP1944510A1 (fr) 2007-01-05 2007-11-15 Machine à piston avec cylindre pivotable

Country Status (2)

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EP (1) EP1944510A1 (fr)
DE (1) DE102007001795A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012065682A1 (fr) * 2010-11-19 2012-05-24 Robert Bosch Gmbh Machine à pistons hydraulique
EP3477102A1 (fr) * 2017-10-25 2019-05-01 Innas B.V. Dispositif hydraulique et joint de pivot
CN110630462A (zh) * 2019-09-30 2019-12-31 北京工业大学 一种全水润滑的柔性浮杯式轴向柱塞泵

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010052561A1 (de) 2010-11-25 2012-05-31 Robert Bosch Gmbh Verfahren zur Anbindung von Kolben an eine Rotorplatte, Triebwelle und Hydraulikmaschine
CN108552121B (zh) * 2018-07-03 2023-09-29 安徽国援智能科技有限公司 一种旋转式蜂卡制作装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968286A (en) * 1956-05-29 1961-01-17 Reiners Walter Hydraulic axial-piston machine
US4466338A (en) * 1981-06-26 1984-08-21 Hydromatik Gmbh Oblique-shaft axial piston machine having a follower plate for the cylinder drum
US5636561A (en) * 1992-10-30 1997-06-10 Felice Pecorari Volumetric fluid machine equipped with pistons without connecting rods
WO2004055369A1 (fr) * 2002-12-18 2004-07-01 Bosch Rexroth Ag Machine a piston axiaux

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006003122A1 (de) 2005-11-25 2007-05-31 Robert Bosch Gmbh Axialkolbenmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968286A (en) * 1956-05-29 1961-01-17 Reiners Walter Hydraulic axial-piston machine
US4466338A (en) * 1981-06-26 1984-08-21 Hydromatik Gmbh Oblique-shaft axial piston machine having a follower plate for the cylinder drum
US5636561A (en) * 1992-10-30 1997-06-10 Felice Pecorari Volumetric fluid machine equipped with pistons without connecting rods
WO2004055369A1 (fr) * 2002-12-18 2004-07-01 Bosch Rexroth Ag Machine a piston axiaux

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012065682A1 (fr) * 2010-11-19 2012-05-24 Robert Bosch Gmbh Machine à pistons hydraulique
EP3477102A1 (fr) * 2017-10-25 2019-05-01 Innas B.V. Dispositif hydraulique et joint de pivot
WO2019081558A1 (fr) * 2017-10-25 2019-05-02 Innas Bv Dispositif hydraulique et articulation rotoïde
US11802539B2 (en) 2017-10-25 2023-10-31 Innas, Bv Hydraulic device and a pivot joint
CN110630462A (zh) * 2019-09-30 2019-12-31 北京工业大学 一种全水润滑的柔性浮杯式轴向柱塞泵

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Publication number Publication date
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