EP0863310A1 - Moteur hydraulique dont les axes longitudinaux des éléments de propulsion sont inclinés à la fois par rapport aux autres éléments de propulsion et par rapport à l'axe de l'arbre d'entraínement - Google Patents

Moteur hydraulique dont les axes longitudinaux des éléments de propulsion sont inclinés à la fois par rapport aux autres éléments de propulsion et par rapport à l'axe de l'arbre d'entraínement Download PDF

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Publication number
EP0863310A1
EP0863310A1 EP98200246A EP98200246A EP0863310A1 EP 0863310 A1 EP0863310 A1 EP 0863310A1 EP 98200246 A EP98200246 A EP 98200246A EP 98200246 A EP98200246 A EP 98200246A EP 0863310 A1 EP0863310 A1 EP 0863310A1
Authority
EP
European Patent Office
Prior art keywords
motor according
drive shaft
respect
propulsion members
cylinder
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Withdrawn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
EP98200246A
Other languages
German (de)
English (en)
Inventor
Alessandro Breveglieri
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.)
RIVA CALZONI OLEODINAMICA S.P.A.
Original Assignee
Riva Calzoni SpA
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 Riva Calzoni SpA filed Critical Riva Calzoni SpA
Publication of EP0863310A1 publication Critical patent/EP0863310A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0602—Component parts, details
    • F03C1/0605—Adaptations of pistons

Definitions

  • the present invention relates to a hydraulic motor, the propulsion members of which are arranged with their axis inclined both with respect to the longitudinal axis of the other propulsion members and with respect to the axis of the drive shaft.
  • these motors of the known type have some limitations due mainly to the fact that they generate limited starting torques, in particular when there is a reduction in the inclination of the element which is integral with the drive shaft and which is acted on by the propulsion members in order to cause rotation of the latter, or, for the same inclination of said element, the inclination of the propulsion members with respect to the latter becomes minimal.
  • the technical problem which is posed, therefore, is that of providing a hydraulic motor which is able to overcome the abovementioned limitations.
  • the motor should be able to be made indifferently with the cylinder capacity fixed or variable so as to be adaptable to the most varied applicational requirements and be able to operate with the same efficiency both as a motor and as a pump.
  • propulsion members should be retained against the respective contact and reaction surfaces via associated means which also ensure a seal against the thrusting fluid and allow the dead volumes of the fluid itself during the cycle to be reduced.
  • a hydraulic motor comprising a drive shaft, propulsion members, an element which is coaxial with the drive shaft and integral with the latter and which is acted on by said propulsion members and an eccentric body for reaction to the thrust of said propulsion members, wherein each propulsion member has a longitudinal axis inclined both with respect to the longitudinal axis of the other propulsion members and with respect to the axis of the drive shaft.
  • the motor according to the invention comprises a body 10 which supports by means of a bearing 11a one end of the drive shaft 12, the other end of which is supported by an additional bearing 11b integral with a cover 13 closing the body 10 of the motor.
  • the middle part of the drive shaft 12, including the body 10 and the cover 13, has keyed onto it a disc 15 which is made to rotate by the propulsion members 20 described further below and which therefore forms the element for operating the drive shaft itself.
  • Said disc 15 has formed in it the ducts 15a for distribution of the fluid operating the propulsion members and on its surface opposite that of the cover 13 there are formed spherical seats 15b inside each of which one of the two ends of the propulsion members 20 is received.
  • Said propulsion members 20 consist of a cylinder 21, one of the two end edges of which is in abutment against the associated spherical seat 15b formed in the disc 15, and a piston 22, telescopically slidable inside the cylinder 21 and having one of the two end edges in abutment against the surface 32a of a body 30 which is eccentric with respect to the drive shaft 12.
  • the bearing edge of said cylinder 21 and said piston 22 against the associated sliding-contact surfaces 15b and 32a, respectively, of the disc 15 and the eccentric cam 30, essentially consists (Fig. 3) of an annular edge 21a, 22a having a contact surface 21b, 22b parallel to the surface of the eccentric cam, and a tooth 21c,22c extending outwards and designed to engage with retaining means 40 described below.
  • the eccentric body (Fig. 3) is essentially composed of a bell-piece 30, the narrowest part of which is formed by a tube 31 designed to allow the drive shaft 12 to pass through and be arranged, with a limited part of its end edge 31a, in abutment against the disc 15.
  • the widest part 32 of the bell-piece is shaped with two opposite spherical convex surfaces 32a and 32b forming, respectively, the reaction surface of the piston 22 and the abutment surface of the eccentric cam 30 against the body 10, so that the said cam 30 is prevented from performing movements in a direction parallel to that of the drive shaft.
  • said retaining and locking means 40 consist of a sliding piece 43 having a hole 43a with a diameter slightly greater than the external diameter of the piston 21 so as to allow the latter to pass through.
  • Said sliding piece 43 has an upper surface 43b designed to form an engaging seat for a bowl-shaped element 45 comprising a hollow cylindrical part 45a coaxial with the tube 31 of the eccentric cam 30 and a bowl-shaped part 45b with a turned-back edge for allowing engagement with the eccentric cam 30.
  • the bowl-shaped part 45b has moreover openings 45d designed to allow the propulsion member 20 to pass through.
  • the bowl 45 once engaged with the eccentric cam 30, presses against each edge 43c of all the sliding pieces 43 arranged around each cylinder 21, sliding pieces which, in turn, keep the associated cylinder 21 in abutment against the eccentric cam 30 during rotation thereof.
  • a resilient element is arranged between them, said resilient element in the example consisting of a wave spring 46, designed to impart a force of relative contact between the sliding-contact surfaces, which is constant and independent of the working phases of the propulsion member and compatible with the spatial position assumed by the eccentric cam 30.
  • the retaining elements 40 again consist of a sliding piece 48 pushed in abutment against the shoulder 21c of the cylinder by a ring 47, which is coaxial with the cylinder 21 and associated with two pins 49, the axis of which lies on the radial axis of the cylinder and which are both fastened to the disc 15 by means of a support 18.
  • Said pins 49 therefore allow rotation of the cylinder 21 about its radial axis.
  • a wave spring 46 is arranged between sliding piece 48 and annular edge 21a so as to ensure constant adherence of the sliding-contact surfaces during the various working phases of the propulsion member 20.
  • the cylinder 21 is essentially as a whole designed to rotate about a centre point arranged on its longitudinal axis, so as to follow spherical trajectories during rotation of the drive shaft; this ensures that the propulsion member 20 does not lose its adherence against the associated contact surfaces of the disc 15 and the body 30 during rotation of the latter.
  • the motor according to the invention may also be realized with a variable cylinder capacity: in this case the eccentric body 30 may be made to rotate along an arc with a circumference having its centre on the centre of the spherical surface of contact between the cover-piece 30 and the body 10.
  • Said rotation is performed by means of a cylinder 50 which is radially integral with the casing of the motor 10 and the piston 51 of which acts on a radial surface of the eccentric body 30.
  • the free end of the piston 51 consists of a flat flange 51a which prevents rotation of the eccentric cam 30 about its longitudinal axis, interfering with a corresponding lug 33 of the eccentric bell-piece 30.
  • the eccentric bell-piece 30 rotates so as to be arranged with its longitudinal axis at an angle, with respect to the motor axis, which is smaller than the preceding one; in this way each propulsor 20 performs (Fig. 5) a smaller compression and expansion stroke than the preceding one (Fig. 2), causing an actual reduction in the cylinder capacity of the motor.
  • Said displacement of the eccentric cover-piece 30 which causes the variation in eccentricity with respect to the drive shaft is not linear, but is performed along an arc, the centre of which is the centre of the surface 32b, making it possible to obtain significant variations in the cylinder capacity with very small dimensions and with minimum sliding of the spherical surface 32a of the eccentric cam 30 with respect to the contact surface of the pistons 22.
  • the propulsors are located at an angle both with respect to the axis of rotation of the drive shaft and with respect to one another and, during each cycle, follow a trajectory of the conoidal type, the vertex of which is the centre of the spherical cover-piece 30 forming the eccentric cam of the motor and the base of which is defined by the circular trajectory of the spherical seats 16a of the disc 16.
EP98200246A 1997-02-27 1998-01-28 Moteur hydraulique dont les axes longitudinaux des éléments de propulsion sont inclinés à la fois par rapport aux autres éléments de propulsion et par rapport à l'axe de l'arbre d'entraínement Withdrawn EP0863310A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI970429 1997-02-27
IT97MI000429A IT1290556B1 (it) 1997-02-27 1997-02-27 Motore idraulico ad organi propulsori con asse longitudinale inclinato sia rispetto agli altri propulsori sia rispetto all'asse dell'albero

Publications (1)

Publication Number Publication Date
EP0863310A1 true EP0863310A1 (fr) 1998-09-09

Family

ID=11376205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200246A Withdrawn EP0863310A1 (fr) 1997-02-27 1998-01-28 Moteur hydraulique dont les axes longitudinaux des éléments de propulsion sont inclinés à la fois par rapport aux autres éléments de propulsion et par rapport à l'axe de l'arbre d'entraínement

Country Status (4)

Country Link
EP (1) EP0863310A1 (fr)
JP (1) JPH10238452A (fr)
CA (1) CA2230522A1 (fr)
IT (1) IT1290556B1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1548517A (fr) * 1967-10-23 1968-12-06
US3885459A (en) * 1970-02-20 1975-05-27 New Invent Sa Telescopic piston-cylinder assembly for hydraulic machines and machinery components

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1548517A (fr) * 1967-10-23 1968-12-06
US3885459A (en) * 1970-02-20 1975-05-27 New Invent Sa Telescopic piston-cylinder assembly for hydraulic machines and machinery components

Also Published As

Publication number Publication date
JPH10238452A (ja) 1998-09-08
ITMI970429A1 (it) 1998-08-27
CA2230522A1 (fr) 1998-08-27
IT1290556B1 (it) 1998-12-10

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