EP0685647B1 - Hydraulischer Radialkolbenmotor mit veränderbarem Hubvolumen - Google Patents

Hydraulischer Radialkolbenmotor mit veränderbarem Hubvolumen Download PDF

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Publication number
EP0685647B1
EP0685647B1 EP95200926A EP95200926A EP0685647B1 EP 0685647 B1 EP0685647 B1 EP 0685647B1 EP 95200926 A EP95200926 A EP 95200926A EP 95200926 A EP95200926 A EP 95200926A EP 0685647 B1 EP0685647 B1 EP 0685647B1
Authority
EP
European Patent Office
Prior art keywords
eccentric ring
radial
motor according
pistons
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.)
Expired - Lifetime
Application number
EP95200926A
Other languages
English (en)
French (fr)
Other versions
EP0685647A2 (de
EP0685647A3 (de
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 OLEODINAMICA SpA
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Publication date
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Publication of EP0685647A2 publication Critical patent/EP0685647A2/de
Publication of EP0685647A3 publication Critical patent/EP0685647A3/de
Application granted granted Critical
Publication of EP0685647B1 publication Critical patent/EP0685647B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
    • 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
    • F03C1/0447—Controlling
    • F03C1/0457—Controlling by changing the effective piston stroke
    • F03C1/046—Controlling by changing the effective piston stroke by changing the excentricity of one element relative to another element
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F04B49/125—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts

Definitions

  • the object of this invention is a radial-actuator hydraulic motor, the cylinder capacity of which may be varied by means of an eccentric ring integral with the crankshaft, fitted with a hydraulic device having a dual valve to set and control the variation of eccentricity of such eccentric ring with respect to the crankshaft, and independent shift actuators mechanically linked to the said eccentric ring.
  • variable-displacement radial hydraulic motors have several disadvantages. For example, they do not stably maintain the cylinder capacity at all the values comprised within the range of variation; they need to be removed and detached from the working parts for the maintenance of such rotary-shaft valves and gaskets (which are severely stressed) and they are subject to significant losses of energy as a result of friction and discharge. All the foregoing combines to bring about in such motors inadequate performance, reliability and efficiency which considerably limit their applications.
  • control and setting devices of known type provide for the use of return springs for the movement of the eccentric ring operating pistons, rendering necessary special equipment and arrangements to achieve the positioning thereof inside the said eccentric ring.
  • a further aim of the invention is to provide a control device capable of being easily fitted to and/or removed from fixed-displacement motors for the conversion thereof into variable-displacement motors by using a small number of moving parts, gaskets and machined surfaces.
  • a variable-displacement hydraulic motor with radial cylinders supplied by a rotary fluid distributor and acting on an eccentric ring axially fixed to a crankshaft but capable of moving radially with respect thereto, such motor being provided with a device for setting and controlling the variation of eccentricity of the eccentric ring with respect to the crankshaft, which comprises at least one pair of actuating pistons located in counterposition to and independent of one another, arranged in a radial sense between the shaft and the ring, each of which is made mechanically integral with such eccentric ring via appropriate means of connection, and at least one pair of alternating-control valves to block the flow of the fluid operating such actuating pistons.
  • the rotary distributor drive shaft to have internal axial channels capable of connecting the valves to the radial ducts communicating with the outlets of the distributor controlling the supply and discharge of fluid.
  • control valves may be arranged in a radial sense in relation to the same section of shaft on which is fitted the eccentric ring or in an axial sense inside the drive shaft of the rotary distributor supplying the motor cylinders.
  • variable-displacement hydraulic motor is comprised of a housing 1 in which are located cylinders 3, each of which is placed in communication with a rotary distributor 4 located in a cover 1a attached to housing 1 by means of screws 1b, operated by a drive shaft 4d and capable of placing cyclically in a supply or discharge setting cylinders 3 in phase with the rotation of crankshaft 7.
  • radially pistons 5 which bear against the outer surface of a ring 6 capable of moving eccentrically in a radial sense with respect to the axis of crankshaft 7, such variation of eccentricity bringing about the variation of the cylinder capacity of of the motor.
  • shaft 7 has transverse locators 7a, 7b in relation to its zone of engagement with pistons 5.
  • Such locators are capable of maintaining ring 6 centred lengthwise and of enabling it to move in a transverse sense.
  • pistons 8 and 9 Inside shaft 7 in relation to the zone of engagement with eccentric ring 6 are located pistons 8 and 9 in counterposition, the outer end of which has T-shaped pins, respectively 8a, 9a, capable of being inserted axially in corresponding seats 6a of eccentric ring 6 with which they become mechanically integral in a radial sense.
  • Such link enables the pistons to follow the eccentric ring when the latter moves radially for reasons other than positive and controlled operation imparted via valves 10 and said pistons 8, 9.
  • shaft 7 also has longitudinal recesses 7c through which ring 6 is made to strike shaft 7, only in relation to the outer edges of the sliding plane of ring 6, thus making it possible to unload the resultant of the forces generated by pistons 5, which is substantially normal to the thrust axis of pistons 8 and 9, spreading the same equally over such outer edges.
  • This makes it possible to obtain a reduction of stress in relation to the axes of actuating pistons 8 and 9, which stress could bring about deformations with consequent hindrance of the sliding movement thereof.
  • each piston 8 and 9, and therefore of eccentric ring 6 is effected via an appropriate valve 10 which blocks the fluid to be supplied/discharged to/from pistons 8, 9 and coming from the rotary connection via axial ducts 4a, 4b provided on drive shaft 4d of distributor 4 which supplies the chambers of cylinders 3.
  • Such valves are of the alternating-control type in order to obtain the discharge of one piston when the other is being supplied, and vice versa.
  • valves are located radially inside the portion of shaft guiding eccentric ring 6 and are connected to respective pistons 8 and 9 via appropriate ducts 8b, 9b.
  • Static sealing of the ducts connected to shaft 7 is achieved by means of gaskets 4c, while dynamic sealing is implemented via gaskets 11 forming the subject of another patent in the name of the same applicant.
  • housing 1 and cover 1a of the motor is interposed a fixed body 1c in which are provided ducts 12 and 13 for the supply of fluid which flows via ducts 4a, 4b of drive shaft 4d to blocking valves 10.
  • Such operating fluid is supplied via an inlet under pressure P and a duct 12 on which is located a cartridge filter 12a.
  • the pressurized fluid emerging from filter 12a is fed via ducts 12 and 13 to a distributor 100 from which flow out pressure controls A and B for the operation of blocking valves 10.
  • controllable valves 10 To implement the variation and maintenance of intermediate cylinder capacities between maximum and minimum, the fluid supplied to and contained in actuating pistons 8 and 9 should remain intercepted by controllable valves 10 at nil discharge.
  • valves 10 are comprised (fig. 4) of a cylindrical body 10a provided with radial apertures 10b and 10c connected to fluid supply ducts 12 and 13.
  • a piston 14 capable of acting against a cone-seated shutter 15 housed in a guide tube with conical sealing seat 16a against which shutter 15 is pressed by a spring 15a.
  • the valve is closed at the top by a cap 17.
  • the operation of the variation and control device is as follows: Supplying fluid under pressure from inlet P communicating with distributor 100 and switching on the latter, brings about the supply of fluid to one of inlets 10b, 10c of valves 10 causing the alternating opening/closure of shutter 15 of each valve 10 and the consequent supply/discharge of fluid to/from pistons 8 and 9 respectively, which accordingly move in a transverse direction and in one sense or another, according to whether regulation is aimed at a higher or lower cylinder capacity.
  • the movement of pistons 8, 9 which are integral with eccentric ring 6 via T-shaped pins 8a, 9a brings about the shifting in a transverse sense of said ring 6 and therefore the desired variation of cylinder capacity.
  • the centring of distributor 100 after a preset interval interrupts the flow of fluid which remains under pressure in the circuit and blocks pistons 8 and 9 in the setting attained corresponding to the desired cylinder capacity.
  • blocking valves 10 may also be fitted in an axial sense inside shaft 4d driving rotary distributor 4 while there remains substantially unaltered the previously described features of setting and control of eccentricity of ring 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Hydraulic Motors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Vehicle Body Suspensions (AREA)
  • Reciprocating Pumps (AREA)
  • Braking Systems And Boosters (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (9)

  1. Hydraulikmotor mit veränderbarem Hub, mit Radialzylindern, die von einem Dreh-Fluidverteiler (4) gespeist werden und auf einen Exzenterring (6) einwirken, der axial an einer Kurbelwelle (7) angebracht ist, sich dieser gegenüber jedoch radial bewegen kann, ausgestattet mit einer Einrichtung zum Einstellen und Steuern der Veränderung der Exzentrizität des Exzenterrings (6) gegenüber der Kurbelwelle (7), umfassend mindestens ein Paar Betätigungskolben (8, 9), die in Gegenüberstellung und unabhängig voneinander angeordnet sind, dadurch gekennzeichnet, daß die Kolben (8, 9) in radialer Orientierung zwischen Welle (7) und Ring (6) angeordnet sind, wobei jeder von ihnen über geeignete Verbindungsmittel (8a, 9a) mit dem Exzenterring (6) mechanisch integriert ist, und mindestens ein Paar von gegensinnig angesteuerten Ventilen (10) zum Sperren des die Betätigungskolben (8, 9) betreibenden Fluidstroms vorgesehen ist.
  2. Motor nach Anspruch 1, dadurch gekennzeichnet, daß eine mechanische Kopplung zwischen den Betätigungskolben (8, 9) und dem Exzenterring (6) durch T-Stücke (8a, 9a) gebildet wird, die in Längsrichtung des Rings (6) einführbar sind und den Ring in radialer Richtung fixiert halten können.
  3. Motor nach Anspruch 1, dadurch gekennzeichnet, daß der Fluidstrom zwischen einem Einlaß (P) und einem Auslaß (T) über einen Vierwegeverteiler (100) sowie Kanäle (12, 13) in einer Verbindungseinheit (1c) zwischen einem Motorgehäuse (1) und einem den die Motorzylinder (3) speisenden Drehverteiler (4) enthaltenden Deckel (1a) stattfindet.
  4. Motor nach Anspruch 1 und 3, dadurch gekennzeichnet, daß die Verbindungseinheit (1c) für die Verbindung mit dem Deckel (1a) und dem Gehäuse (1) des Motors identische einander abgewandte Stirnflächen aufweist.
  5. Motor nach Anspruch 1, dadurch gekennzeichnet, daß die Sperrventile (10) gebildet werden durch einen Zylinderkörper (10a), der mit Radialöffnungen (10b, 10c) ausgestattet ist, die mit Kanälen (12, 13) verbunden sind, wobei in dem Körper (10a) verschieblich ein Kolben (14) gelagert ist, der gegen einen Kegelsitz-Verschluß (15) arbeitet, der in einer Führungshülse (16) mit kegelförmigem Dichtungssitz (16a) aufgenommen ist, gegen den der Verschluß (15) von einer Feder (15a) gedrückt wird, um den zu den Kolben (8, 9) führenden Kanal zu öffnen/schließen.
  6. Motor nach Anspruch 1, dadurch gekennzeichnet, daß eine Antriebswelle (4d) des Drehverteilers (4) axial verlaufende Innenkanäle (4b) aufweist, über die die Ventile (10) mit Radialkanälen (12, 13) verbunden werden können, welche mit Auslässen (A, B) eines die Zufuhr und das Ablassen von Fluid steuernden Verteilers (100) kommunizieren.
  7. Motor nach Anspruch 1, dadurch gekennzeichnet, daß die Sperrventile (10) in radialer Orientierung bezüglich des gleichen Querschnitts der Welle (7) angeordnet sind, auf dem der Exzenterring (6) sitzt.
  8. Motor nach Anspruch 1, dadurch gekennzeichnet, daß die Sperrventile (10) axial im Inneren der Antriebswelle (4d) des die Motorzylinder (3) speisenden Drehverteilers (4) angeordnet sind.
  9. Motor nach Anspruch 1, dadurch gekennzeichnet, daß die Welle (7) Längsausnehmungen (7c) und Queranschläge (7a, 7b) bezüglich der Zone aufweist, in der der Exzenterring (6) sitzt.
EP95200926A 1994-04-29 1995-04-12 Hydraulischer Radialkolbenmotor mit veränderbarem Hubvolumen Expired - Lifetime EP0685647B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI940840A IT1271634B (it) 1994-04-29 1994-04-29 Motore idraulico a cilindri radiali a cilindrata variabile mediante attuatori separati e relative valvole di comando
ITMI940840 1994-04-29

Publications (3)

Publication Number Publication Date
EP0685647A2 EP0685647A2 (de) 1995-12-06
EP0685647A3 EP0685647A3 (de) 1996-02-21
EP0685647B1 true EP0685647B1 (de) 2000-07-05

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ID=11368783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95200926A Expired - Lifetime EP0685647B1 (de) 1994-04-29 1995-04-12 Hydraulischer Radialkolbenmotor mit veränderbarem Hubvolumen

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EP (1) EP0685647B1 (de)
AT (1) ATE194411T1 (de)
DE (1) DE69517751T2 (de)
IT (1) IT1271634B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101432520B (zh) * 2006-04-20 2011-06-08 S.A.I会水利设备股份公司 具有星形缸体和连续可变排量的液压马达

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635458A1 (de) * 1996-08-31 1998-03-05 Tiefbohrtechnik Gmbh Tbt Membranpumpe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1385702A (en) * 1971-01-29 1975-02-26 Chamberlain Ind Ltd Hydraulic motors and the like
DE2654526C3 (de) * 1976-12-02 1982-09-30 G. Düsterloh GmbH, 4322 Sprockhövel Hydrostatische Radialkolbenmaschine
US4474104A (en) * 1983-04-11 1984-10-02 Double A Products Co. Control system for variable displacement pumps and motors
EP0342751B1 (de) * 1988-05-19 1993-03-31 Bruno Giamello Hydraulischer Radialkolbenmotor mit veränderbarem Hubvolumen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101432520B (zh) * 2006-04-20 2011-06-08 S.A.I会水利设备股份公司 具有星形缸体和连续可变排量的液压马达

Also Published As

Publication number Publication date
ATE194411T1 (de) 2000-07-15
EP0685647A2 (de) 1995-12-06
ITMI940840A1 (it) 1995-10-29
ITMI940840A0 (it) 1994-04-29
IT1271634B (it) 1997-06-04
EP0685647A3 (de) 1996-02-21
DE69517751D1 (de) 2000-08-10
DE69517751T2 (de) 2000-11-16

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