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EP3018345B1 - Moteur à colonne de fluide hydraulique doté de moyens ameliorés permettant de retenir les éléments de propulsion contre des surfaces de glissement associées - Google Patents

Moteur à colonne de fluide hydraulique doté de moyens ameliorés permettant de retenir les éléments de propulsion contre des surfaces de glissement associées Download PDF

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Publication number
EP3018345B1
EP3018345B1 EP15193031.0A EP15193031A EP3018345B1 EP 3018345 B1 EP3018345 B1 EP 3018345B1 EP 15193031 A EP15193031 A EP 15193031A EP 3018345 B1 EP3018345 B1 EP 3018345B1
Authority
EP
European Patent Office
Prior art keywords
piston
cover
contact
fluid
hydraulic motor
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.)
Active
Application number
EP15193031.0A
Other languages
German (de)
English (en)
Other versions
EP3018345A1 (fr
Inventor
Loris De Leonardis
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.)
Parker Hannifin Manufacturing SRL
Original Assignee
Parker Hannifin Manufacturing SRL
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Filing date
Publication date
Application filed by Parker Hannifin Manufacturing SRL filed Critical Parker Hannifin Manufacturing SRL
Publication of EP3018345A1 publication Critical patent/EP3018345A1/fr
Application granted granted Critical
Publication of EP3018345B1 publication Critical patent/EP3018345B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • 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

Definitions

  • the present invention relates to a fluid-column hydraulic motor provided with improved means for sealingly retaining the propulsion members against associated sliding surfaces.
  • Said propulsion members may be arranged radially, axially or inclined.
  • hydraulic motors will also be understood as referring to the said fluid column motors.
  • the technical problem which is posed therefore is that of providing a fluid-column hydraulic motor, in particular, but not necessarily of the radial type, which has simplified means for retaining the external cylinder of the propulsion members against respective surfaces with which they must make contact in a sealingly stable manner.
  • the hydraulic motor in the version with radial propulsion members comprises a casing 1 having, housed inside it, the shaft 2 mounted on bearings and provided with the eccentric cam 3 against which the propulsion members 10 act radially.
  • Each propulsion member 10 is contained inside the casing 1 closed by respective covers 4 which are fastened to the casing by respective fixing means which are preferably inserted in the radial direction.
  • Said propulsion members 10 are in turn formed by a cylinder 11, one of the two radial end edges of which bears against the outer surface 3a of the said eccentric cam 3, and by a piston 12 telescopically slidable in a radial direction inside the cylinder 11 and having one of its two radial end edges in bearing contact against a respective sliding surface 4b of the cover 4.
  • the sliding surface 4b of the cover 4 has a convex spherical shape and correspondingly the contact surface 12b of the piston 12 is shaped as a corresponding concave spherical surface.
  • said retaining means have substantially three elements both in the contact zone between the cylinder 11 and the eccentric cam 3 and in the contact zone between the piston 12 and the cover 4.
  • said locking elements consist of: a respective shoe 13 provided with a coaxial hole 13a having a diameter slightly greater than the external diameter of the cylinder 11 so as to allow the passage thereof.
  • Said shoe 13 also has at least one pair of opposite and parallel edges having a substantially L-shaped cross-section and extending in the manner of a cylindrical profile coaxial with the axis of the eccentric cam 3.
  • the short arm 13d of each L has an upper surface 13f designed to form an engaging element for a single ring 15 having its centre on an axis parallel to that of the drive shaft 2 and passing through the centre of the spherical cam and arranged around each edge 13c of all the shoes 13 for retaining each cylinder 11.
  • the opposite rings 15 radially retain all the shoes 13 which, in turn, keep the associated cylinder 11 in bearing contact against the eccentric cam 3 during rotation thereof.
  • a resilient element in the example a wave spring 16, which is designed to impart a radial force for ensuring relative contact between the sliding surfaces which is constant and independent of the working phases of the propulsion member.
  • the retaining elements are in turn formed by a ring 17 which has its centre on the radial/transverse axis Y-Y and is constrained to the cover 4 of the motor and which has a concave spherical surface 17a which is concentric with the concave spherical surface 12b and is designed to push against a corresponding convex spherical surface 18a of shoe 18 in turn acting in the radial direction on an annular edge 12a of the piston 12.
  • a wave spring 16 is arranged between shoe 18 and annular edge 12a so as to ensure constant contact between the sliding surfaces during the various working phases of the propulsion member 10.
  • the end 12a of the piston 12 making contact with the sliding surface 4b of the cover 4 is in contact with an internal spring 13 arranged between piston 12 and cylinder 11 and able to exert the dual thrusting action between cylinder and eccentric cam and between piston and crown of the cover.
  • the same end 12 also has a radially inner surface 12d opposite to the surface 12b making contact with the sliding surface on the cover 4, which inner surface 12d has a convex spherical shape parallel to that of the sliding surface 4b of the cover 4.
  • the casing 1 of the motor has an annular projection 1a axially directed towards the inside of the motor and provided with a concave, spherical shaped, upper surface 1d parallel to the said convex, radially inner, spherical surface 12d of the end of the piston 12.
  • the spring 13 pushes the top end 12a of the piston 12 against the cover 4, bringing the respective surfaces 12b and 4b into contact with each other, while keeping at the same time the radially inner surface 12d spaced from the corresponding surface 1d of the projection 1a, thus determining the triple effect of: a stable sealed contact of the piston of the propulsion member against the corresponding sliding surface of the cover, a free floating movement of the cylinder inside the motor casing, and also mechanical retention of the piston which, in the event of malfunction, is prevented, by the projection 1a, from coming out of its correct working position, thus avoiding possible serious damage to the motor which would otherwise occur if the piston were left free to come of its position.
  • the sealed contact of the cylinder against the eccentric cam may be obtained in accordance with the prior art.
  • the motor according to the invention results in a significant reduction in the parts required for its operation and also a substantial simplification of the machining operations which must be carried out on the single parts and the assembly operations; the formation of the convex and concave spherical surfaces on the respective covers and projections of the casing, piston and cover may in fact be easily realized during production of the two components and does not require additional machining and/or handling during assembly of the motor.
  • the scope of the present invention also includes the equivalent configuration of the propulsion member inverted with an inner cylinder and outer piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)

Claims (5)

  1. Moteur hydraulique à colonne de fluide comprenant un carter (1), un arbre d'entraînement (2) pourvu d'une came excentrique (3), une pluralité d'éléments de propulsion (10) agissant sur ladite came excentrique et comprenant chacun un cylindre (11) et un piston (12) qui sont coaxiaux, mobiles de manière télescopique l'un par rapport à l'autre de façon à être déployés ou rétractés, lesdits éléments de propulsion (10) étant contenus dans des logements respectifs du carter (1) fermés par un couvercle (4), le moteur hydraulique à colonne de fluide comprenant en outre des moyens de maintien de manière étanche des extrémités des cylindres (11) contre la came excentrique (3) et des extrémités des pistons (12) contre des surfaces de contact glissant respectives (4b) du couvercle (4), dans lequel la surface (4b) du couvercle (4) établissant un contact glissant avec le piston (12) a une forme sphérique convexe, les moyens de maintien de l'extrémité libre (12a) du piston (12) contre ladite surface de contact glissant (4b) comportent une surface radialement extérieure (12b) en contact avec la surface de contact glissant (4b) du couvercle (4) qui est conçue avec la forme d'une surface sphérique concave (12b) parallèle à la surface sphérique convexe de la surface de contact glissant (4b) du couvercle (4) et une surface radialement intérieure (12d) opposée à la surface radialement extérieure (12b), laquelle surface intérieure (12d) a une forme sphérique convexe parallèle à celle de la surface de contact glissant (4b) du couvercle (4), et caractérisé en ce que le carter (1) du moteur comporte une saillie annulaire (1a) orientée axialement vers l'intérieur du moteur et pourvue d'une surface supérieure, concave, de forme sphérique (1d) parallèle à ladite surface sphérique, convexe, radialement intérieure (12d) de l'extrémité correspondante du piston (12), et en ce que, dans des conditions de travail, un espace est maintenu entre ladite surface sphérique, convexe, radialement intérieure (12d) de l'extrémité correspondante du piston (12) et la surface supérieure, parallèle, convexe, de forme sphérique (1a) de la saillie (1a).
  2. Moteur hydraulique à colonne de fluide selon la revendication 1, caractérisé en ce que l'extrémité (12a) du piston (12) établissant un contact avec la surface de glissement (4b) du couvercle (4) est en contact avec un ressort interne (13) disposé entre un piston (12) et un cylindre (11) et pouvant exercer la double action de poussée entre un cylindre et la came excentrique et entre un piston et une couronne du couvercle.
  3. Moteur hydraulique à colonne de fluide selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est du type à éléments de propulsion radiaux.
  4. Moteur hydraulique à colonne de fluide selon la revendication 1 ou 2, caractérisé en ce qu'il est du type à éléments de propulsion axiaux
  5. Moteur hydraulique à colonne de fluide selon la revendication 1 ou 2, caractérisé en ce qu'il est du type à éléments de propulsion inclinés.
EP15193031.0A 2014-11-07 2015-11-04 Moteur à colonne de fluide hydraulique doté de moyens ameliorés permettant de retenir les éléments de propulsion contre des surfaces de glissement associées Active EP3018345B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20141917 2014-11-07

Publications (2)

Publication Number Publication Date
EP3018345A1 EP3018345A1 (fr) 2016-05-11
EP3018345B1 true EP3018345B1 (fr) 2017-06-07

Family

ID=52232315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15193031.0A Active EP3018345B1 (fr) 2014-11-07 2015-11-04 Moteur à colonne de fluide hydraulique doté de moyens ameliorés permettant de retenir les éléments de propulsion contre des surfaces de glissement associées

Country Status (1)

Country Link
EP (1) EP3018345B1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040716A (en) * 1958-06-28 1962-06-26 Hahn Theodor Piston engines
GB1246647A (en) * 1967-09-29 1971-09-15 Riva Calzoni Spa Hydraulic motor
DE2253022C2 (de) * 1972-10-28 1974-12-12 G.L. Rexroth Gmbh, 8770 Lohr Radialkolbenmaschine
US4144799A (en) * 1976-06-25 1979-03-20 Ponchaux Jean Luc Fluid machine
DE2716888C3 (de) * 1977-04-16 1985-08-22 Mannesmann Rexroth GmbH, 8770 Lohr Hydrostatische Radialkolbenpumpe
DE3430362A1 (de) 1984-08-17 1986-02-27 Paul Pleiger Maschinenfabrik GmbH & Co KG, 5810 Witten Radialkolbenmotor
DE3726957A1 (de) 1987-08-13 1989-03-23 Duesterloh Gmbh Radialkolbenmaschine
DE69731174T2 (de) 1996-12-23 2006-03-09 Parker Calzoni S.R.L., Anzola Dell'emilia Hydraulikmotor mit radial angeordneten, rohrförmigen Antriebselementen

Also Published As

Publication number Publication date
EP3018345A1 (fr) 2016-05-11

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