EP0607069A1 - Flüssigkeitsmotorkolben - Google Patents

Flüssigkeitsmotorkolben Download PDF

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Publication number
EP0607069A1
EP0607069A1 EP94400045A EP94400045A EP0607069A1 EP 0607069 A1 EP0607069 A1 EP 0607069A1 EP 94400045 A EP94400045 A EP 94400045A EP 94400045 A EP94400045 A EP 94400045A EP 0607069 A1 EP0607069 A1 EP 0607069A1
Authority
EP
European Patent Office
Prior art keywords
piston
axis
piston body
cylindrical wall
section
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.)
Granted
Application number
EP94400045A
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English (en)
French (fr)
Other versions
EP0607069B1 (de
Inventor
Louis Martin
Jean-Pierre Souply
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.)
Poclain Hydraulics France SA
Original Assignee
Poclain Hydraulics France SA
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 Poclain Hydraulics France SA filed Critical Poclain Hydraulics France SA
Publication of EP0607069A1 publication Critical patent/EP0607069A1/de
Application granted granted Critical
Publication of EP0607069B1 publication Critical patent/EP0607069B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0406—Pistons

Definitions

  • a piston is already known comprising a first and a second piston body , whose generators are parallel to the same axis, which are slidably mounted inside, and with respect to said first and second cylindrical walls of the cylinder and with which they delimit first and second working chambers of a fluid, respectively , a sealing means sealing between the first piston body and the first pa cylindrical king and a communication means providing permanent communication between said first and second working chambers.
  • the means of communication comprises a central conduit formed in the central part of the second piston body, and at least one transverse conduit, also formed in this second piston body connecting the central conduit to the first working chamber, said central conduit opening into the second working chamber.
  • said means of communication comprises at least one reduction in the cross section of the second piston body, each reduction in the cross section extending longitudinally at the radial periphery of said second piston body between an end cross section of the second piston body and the first piston body.
  • the main advantage of the embodiments in accordance with the invention lies in obtaining reduced pressure drops and, in a preferred embodiment, in obtaining a good ability to adapt the guidance of the piston to possible unevenness of the cam. , all this by adopting a mechanically resistant piston, simple to machine.
  • each cylinder duct 11 communicates alternately with a distribution duct 22, then with a distribution duct 23, then again with a distribution duct 22 , during the relative rotation of the cylinder block 7 with respect to the pressurized fluid distributor 12.
  • a plurality of cylinders is provided in the cylinder block 7, these cylinders each comprising a first cylindrical wall 26, of axis 27, and, a second cylindrical wall 28, coaxial with the first cylindrical wall, also of axis 27, the axes 27 of the various cylinders being arranged substantially radially with respect to the axis of rotation 5 and being angularly regularly spaced around the axis of rotation 5.
  • first and second cylindrical walls could have separate axes, but nevertheless parallel.
  • a shoulder 29, contained in a plane perpendicular to the axis 27 of the cylindrical walls connects them.
  • the diameter D28 of the second cylindrical wall is also less than that, D26, of the first cylindrical wall, the second cylindrical wall 28 being located between the axis of rotation 5 and the first cylindrical wall 26.
  • this first cylindrical wall 26 opens, opposite the shoulder 29, into the enclosure 30 delimited by the casing 1.
  • a piston comprises a first piston body 31, having a cylindrical face 32 of diameter equal to D26, with play close to operation allowing the sliding of the first piston body 31 relative to the first cylindrical wall 26, and, a second body of piston 33, coaxial with the first body 31, having a cylindrical face 34 of diameter equal to D28, with play close to operation allowing the sliding of this second piston body 33 relative to the second cylindrical wall 28.
  • a transverse face 37 belonging to the first piston body 31 and the delimitation, substantially perpendicular to the axis 27, connects the cylindrical faces 32 and 34, a groove 38 making the connection of the transverse face 37 to the second cylindrical face 34.
  • the first (31) and second (33) piston bodies are inserted into, and slidably mounted relative to the first (26) and second (28) cylindrical walls, and determine working chambers (35, 25) n fluid, respectively.
  • the working chamber 35 is delimited by the first cylindrical wall 26, the shoulder 29, the transverse face 37 and the groove 38.
  • the second working chamber 25 is delimited by a transverse face 39, perpendicular to the axis 27, constituting the internal end of the second piston body 33, by the bottom 40, perpendicular to the axis 27, delimiting the second cylindrical wall 28, and by this second cylindrical wall 28 itself.
  • the working chamber 25 is also connected to the cylinder duct 11.
  • a transverse groove 41 is formed in the first piston body 31, opens into the cylindrical face 32 and receives a sealing member 42 , which provides the seal between the first cylindrical wall 26 and the first piston body 31.
  • a roller 52 cylindrical, with axis 53 and generators parallel to the axis of rotation 5, is rotatably mounted on the end of the first piston body 31 opposite to the second piston body 33 and supports the piston on cam 9.
  • a means of communication carries out the communications between the second working chamber 25 and the first working chamber 35.
  • two flats 43 defined by planes parallel to each other and, at the axis 27, equidistant from this axis 27, extending between the transverse face 39 and the groove 38, delimit two reductions 44 of the cross section of the second piston body 33, which are symmetrical with respect to the axis 27, and each correspond to the surface between the second cylindrical wall 28 and the flat 43 intersecting said second cylindrical wall.
  • the flats 43 are furthermore symmetrical with respect to the transverse plane T, containing the axis 27, perpendicular to the direction D5 of the axis of rotation 5.
  • Two longitudinal conduits 45 are thus provided, at the location of the reductions 44, between the second cylindrical wall 28 and the two flats 43 and connect the two working chambers 25 and 35, opening into the groove 38. These conduits 45, because of their constitution, open at the radial periphery 34 of the second piston body 33.
  • the plane P containing the axis of rotation 5 and the axis 27 is also the plane of symmetry of each reduction 44.
  • FIGS. 3A, 3B, 3C close to the previous one, is distinguished by the replacement of the flats 43 by flats 143, symmetrical with respect to the transverse plane T perpendicular to the direction D5, containing the axis 27, these flats 143 being oblique to said plane T, converging towards the face transverse 39 of the end of the second piston body 33, and thereby defining two longitudinal conduits 145, of transverse sections 144 increasing from the groove 38 to the transverse face 39.
  • These conduits 145 which open at the radial periphery 34 of the second piston body 33, are also symmetrical with respect to the axis 27, and connect the working chambers 25 and 35.
  • the plane P, containing the axis of rotation 5, and the axis 27, is a plane of symmetry of each reduction 144.
  • FIGS. 4A, 4B, 4C adopt two reductions 244 of the cross section of the second piston body 33, each consisting of the intersection of a rectangle, of which a median 246 is contained in the plane P, radial, containing the axis of rotation 5 and the axis 27 and whose two sides 247 parallel to the plane P intersect the second cylindrical wall 28 (and therefore the radial periphery 34 of the second piston body 33).
  • two longitudinal conduits 245 are formed, which open at the radial periphery of the second piston body 33, which are symmetrical with respect to the transverse plane T perpendicular to the axis of rotation 5 and to the direction D5 and containing the axis 27, which are also symmetrical with respect to the axis 27, and which connect the two working chambers 25 and 35, opening into the groove 38.
  • the plane P is a plane of symmetry of each reduction 244.
  • FIGS. 5A, 5B, 5C close to that of FIGS. 4A, 4B, 4C, is distinguished by the form of two reductions 344 of the cross section of the second piston body 33.
  • the cross section 344 of each reduction corresponds to the intersection of a U, whose concave transverse bar 348, constituted by a semicircle, joins two parallel branches 349, the straight line 350, equidistant from the two branches 349, being contained in the plane P, radial, containing the axis of rotation 5 and the axis 27, intersection of said U with the radial periphery 34 of the second piston body 33, and therefore with the second cylindrical wall 28.
  • two longitudinal conduits 345 are formed in the second piston body 33, open in its radial periphery, connect the working chambers 25 and 35 by opening into the groove 38, and are symmetrical with respect to the transverse plane T, perpendicular to the direction D5 of the axis of rotation 5 and containing the axis 27, and, with respect to the axis 27 itself.
  • the cross sections 344 are also constant along each conduit 345, from the transverse face 39 to the groove 38.
  • the plane P is a plane of symmetry of each reduction 344.
  • FIGS. 6A, 6B, 6C close to that of FIGS. 5A, 5B, 5C, is distinguished only by the fact that the section of a reduction 444, also constituted by the intersection of a U with the cylindrical face 34 of the second piston body 33, and therefore with the second cylindrical wall 28, grows along the corresponding conduit 445 from the groove 38 to the transverse face 39 of this second piston body 33.
  • the edges 451 which are in contact with the second cylindrical wall 28 diverges symmetrically with respect to the radial plane P, containing the axis of rotation 5 and the axis 27, from the groove 38 to the transverse face 39.
  • the symmetries with respect to the plane T, relative to the axis 27 and relative to the plane P remain, as is the connection between the working chambers 25 and 35.
  • the plane P which contains the axis of rotation 5 and the axis 27, also contains the contact edge of the roller 52 with the cam 9.
  • the various reductions 44; 144; 244; 344; 444 of the cross section of the second piston body 33 have led to the removal of the material constituting said second piston body 33 in the areas of intersection of said plane P with the second cylindrical surface 28.
  • the concomitance of these characteristics allows a certain pivoting , in fact limited, but nevertheless useful and sufficient, of the piston around an axis orthogonal to the axis of rotation 5 and to the axis 27 of the piston.
  • the longitudinal conduits 45; 145; 245; 345; 445 first make the connection of the working chambers 25 and 35, and therefore allow the fluid under pressure admitted by the distribution conduits 22, or 23, to act on the surface of the transverse face 39, on those of the reductions of section 44; 144; 244; 344; 444, and, on the surface of the transverse face 37, that is to say, in total, on the surface of the entire cross section of the first cylindrical wall 26.
  • these same longitudinal conduits allow the evacuation of the fluid out of the cylinders via the other distribution conduits (23, or, 22).
  • the length of the longitudinal conduits 45; 145; 245; 345; 445 is not constant: maximum when the transverse face 39 is closest to the bottom 40, this length decreases as the distance between the transverse face 39 and the bottom 40 increases, and also decreases the pressure drop longitudinal ducts. This characteristic is naturally sought after and allows a high efficiency of the hydraulic motor to be obtained.
  • the sections of the longitudinal conduits can be progressive (FIGS. 3A, 3B and 3C, and, FIGS. 6A, 6B, 6C), these conduits being also easy to produce, since they open out at the radial periphery 34 of the second body piston 33.
  • the machining is carried out on small parts - the pistons - which makes them economical and easy.
  • the central parts of the pistons, free of conduits, are not weakened, neither by a central conduit, nor by transverse conduits.
  • the machining of the embodiments of FIGS. 2A, 2B, 2C, and, 3A, 3B, 3C are simple millings using "one size” cutters.
  • the machining of the embodiments of FIGS. 4A, 4B, 4C; 5A, 5B, 5C; and, 6A, 6B, 6C can be made by "three size” cutters. That of FIGS. 4A, 4B, 4C, can also be obtained by electroerosion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
EP19940400045 1993-01-13 1994-01-07 Flüssigkeitsmotorkolben Expired - Lifetime EP0607069B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9300218A FR2700364B1 (fr) 1993-01-13 1993-01-13 Piston de moteur hydraulique.
FR9300218 1993-01-13

Publications (2)

Publication Number Publication Date
EP0607069A1 true EP0607069A1 (de) 1994-07-20
EP0607069B1 EP0607069B1 (de) 1997-09-17

Family

ID=9442978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940400045 Expired - Lifetime EP0607069B1 (de) 1993-01-13 1994-01-07 Flüssigkeitsmotorkolben

Country Status (3)

Country Link
EP (1) EP0607069B1 (de)
DE (1) DE69405590T2 (de)
FR (1) FR2700364B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002016769A1 (de) * 2000-08-23 2002-02-28 Bosch Rexroth Ag Hydraulische radialkolbenmaschine
EP2821648A1 (de) 2013-03-06 2015-01-07 Mitsubishi Heavy Industries, Ltd. Hydraulikmaschine und vorrichtung zur erzeugung von erneuerbarer energie

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2836960B1 (fr) * 2002-03-08 2004-07-09 Poclain Hydraulics Ind Moteur hydraulique a cylindres radiaux etages

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1351938A (en) * 1970-06-23 1974-05-15 Lucas Industries Ltd Rotary hydraulic machines with reciprocating pistons

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1351938A (en) * 1970-06-23 1974-05-15 Lucas Industries Ltd Rotary hydraulic machines with reciprocating pistons

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002016769A1 (de) * 2000-08-23 2002-02-28 Bosch Rexroth Ag Hydraulische radialkolbenmaschine
US7028600B2 (en) 2000-08-23 2006-04-18 Bosch Rexroth Ag Hydraulic radial piston engine
EP2821648A1 (de) 2013-03-06 2015-01-07 Mitsubishi Heavy Industries, Ltd. Hydraulikmaschine und vorrichtung zur erzeugung von erneuerbarer energie
EP2821648B1 (de) * 2013-03-06 2018-12-26 Mitsubishi Heavy Industries, Ltd. Hydraulikmaschine und vorrichtung zur erzeugung von erneuerbarer energie

Also Published As

Publication number Publication date
EP0607069B1 (de) 1997-09-17
FR2700364A1 (fr) 1994-07-13
FR2700364B1 (fr) 1995-03-31
DE69405590D1 (de) 1997-10-23
DE69405590T2 (de) 1998-03-12

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