EP3018345A1 - Fluid-säulen-hydraulikmotor mit verbesserten mitteln zum halten des antrieb gegen zugehörige gleitflächen - Google Patents

Fluid-säulen-hydraulikmotor mit verbesserten mitteln zum halten des antrieb gegen zugehörige gleitflächen Download PDF

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Publication number
EP3018345A1
EP3018345A1 EP15193031.0A EP15193031A EP3018345A1 EP 3018345 A1 EP3018345 A1 EP 3018345A1 EP 15193031 A EP15193031 A EP 15193031A EP 3018345 A1 EP3018345 A1 EP 3018345A1
Authority
EP
European Patent Office
Prior art keywords
cover
piston
contact
sliding
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.)
Granted
Application number
EP15193031.0A
Other languages
English (en)
French (fr)
Other versions
EP3018345B1 (de
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
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 Parker Hannifin Manufacturing SRL filed Critical Parker Hannifin Manufacturing SRL
Publication of EP3018345A1 publication Critical patent/EP3018345A1/de
Application granted granted Critical
Publication of EP3018345B1 publication Critical patent/EP3018345B1/de
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.
EP15193031.0A 2014-11-07 2015-11-04 Fluid-säulen-hydraulikmotor mit verbesserten mitteln zum halten des antriebs gegen zugehörige gleitflächen Active EP3018345B1 (de)

Applications Claiming Priority (1)

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

Publications (2)

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

Family

ID=52232315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15193031.0A Active EP3018345B1 (de) 2014-11-07 2015-11-04 Fluid-säulen-hydraulikmotor mit verbesserten mitteln zum halten des antriebs gegen zugehörige gleitflächen

Country Status (1)

Country Link
EP (1) EP3018345B1 (de)

Citations (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
US3577830A (en) * 1967-09-29 1971-05-04 Riva Calzoni Spa Hydraulic motor
US3945766A (en) * 1972-10-28 1976-03-23 Rheinische Chamotte - Und Dinas Werke Radial piston machine
US4144799A (en) * 1976-06-25 1979-03-20 Ponchaux Jean Luc Fluid machine
US4310290A (en) * 1977-04-16 1982-01-12 G. L. Rexroth Gmbh Radial piston pump
US4683806A (en) 1984-08-17 1987-08-04 Paul Maschinenfabrik Gmbh & Co. Kg Piston guide for hollow piston of a radial piston engine
DE3726957A1 (de) 1987-08-13 1989-03-23 Duesterloh Gmbh Radialkolbenmaschine
EP0851119A2 (de) 1996-12-23 1998-07-01 RIVA CALZONI S.p.A. Hydraulikmotor mit radial angeordneten, rohrförmigen Antriebselementen

Patent Citations (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
US3577830A (en) * 1967-09-29 1971-05-04 Riva Calzoni Spa Hydraulic motor
US3945766A (en) * 1972-10-28 1976-03-23 Rheinische Chamotte - Und Dinas Werke Radial piston machine
US4144799A (en) * 1976-06-25 1979-03-20 Ponchaux Jean Luc Fluid machine
US4310290A (en) * 1977-04-16 1982-01-12 G. L. Rexroth Gmbh Radial piston pump
US4683806A (en) 1984-08-17 1987-08-04 Paul Maschinenfabrik Gmbh & Co. Kg Piston guide for hollow piston of a radial piston engine
DE3726957A1 (de) 1987-08-13 1989-03-23 Duesterloh Gmbh Radialkolbenmaschine
EP0851119A2 (de) 1996-12-23 1998-07-01 RIVA CALZONI S.p.A. Hydraulikmotor mit radial angeordneten, rohrförmigen Antriebselementen

Also Published As

Publication number Publication date
EP3018345B1 (de) 2017-06-07

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