EP1600642B1 - Dispositif hydraulique - Google Patents

Dispositif hydraulique Download PDF

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Publication number
EP1600642B1
EP1600642B1 EP04716722A EP04716722A EP1600642B1 EP 1600642 B1 EP1600642 B1 EP 1600642B1 EP 04716722 A EP04716722 A EP 04716722A EP 04716722 A EP04716722 A EP 04716722A EP 1600642 B1 EP1600642 B1 EP 1600642B1
Authority
EP
European Patent Office
Prior art keywords
fluid pressure
cylinder
inner cylinder
tank chamber
chamber
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 - Fee Related
Application number
EP04716722A
Other languages
German (de)
English (en)
Other versions
EP1600642A4 (fr
EP1600642A1 (fr
Inventor
Teruaki Kabushiki Kaisha Opton YOGO
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.)
Opton Co Ltd
Original Assignee
Opton Co Ltd
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 Opton Co Ltd filed Critical Opton Co Ltd
Publication of EP1600642A1 publication Critical patent/EP1600642A1/fr
Publication of EP1600642A4 publication Critical patent/EP1600642A4/fr
Application granted granted Critical
Publication of EP1600642B1 publication Critical patent/EP1600642B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/025—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir
    • F04B23/026—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir a pump-side forming a wall of the reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18—Combined units comprising both motor and pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/06—Details
    • F15B7/10—Compensation of the liquid content in a system

Definitions

  • the present invention relates to a fluid pressure apparatus in which both ports of a fluid pressure pump, driven by an electric motor and rotatable in both directions, are respectively connected to both ports of a fluid pressure actuator through a pair of pipe lines.
  • An object of the present invention is to provide a fluid pressure apparatus whose installation position is not restricted.
  • a fluid pressure apparatus provided with a fluid pressure pump driven by an electric motor and rotatable in both directions, both ports of a fluid pressure actuator and both ports of the fluid pressure pump being respectively connected through a pair of pipe lines, wherein a sliding cavity is formed between an outer cylinder and an inner cylinder.
  • the sliding cavity is divided into a preload chamber and a tank chamber by a piston slidably inserted in the sliding cavity.
  • the tank chamber and the pair of pipe lines are connected through check valves respectively provided in directions so as to allow discharge from the tank chamber to the fluid pressure actuator.
  • the tank chamber is preloaded with the air pressure introduced into the preload chamber, and the fluid pressure pump is disposed in the inner cylinder.
  • the fluid pressure pump may be a swash plate pump. Also, it may be possible to arrange the outer cylinder and the inner cylinder coaxially with a rotating shaft of the electric motor, and mount the outer cylinder and the inner cylinder on the electric motor. Furthermore, the tank chamber may communicate with the inside of the inner cylinder. Alternatively, a top end of the rotating shaft of the electric motor may be rotatably supported by a lid member closing one end of the outer cylinder and one end of the inner cylinder.
  • Fig. 1 is a cross-sectional view of a fluid pressure apparatus as an embodiment of the present invention.
  • Fig. 2 is a hydraulic circuit diagram of the fluid pressure apparatus according to the present embodiment.
  • a fluid pressure pump 1 is a swash plate piston pump that can be rotated in both directions. During a rotation in a forward direction, an operating fluid is drawn in from the side of a first port 2 and discharged from the side of a second port 4. During a rotation in a reverse direction, the operating fluid is drawn in from the side of the second port 4 and discharged from the side of the first port 2.
  • the fluid pressure pump 1 is connected so as to be rotationally driven by an electric motor 6, such as a servomotor.
  • a head side pipe line 8 and a rod side pipe line 10 are respectively connected to the first port 2 and the second port 4.
  • the head side pipe line 8 is connected to a head side port 14 of a fluid pressure cylinder 12 of a single-rod type, while the rod side pipe line 10 is connected to a rod side port 16 of the fluid pressure cylinder 12.
  • any fluid actuator may be employed, such as a fluid pressure cylinder of a double-rod type and a fluid pressure motor.
  • An after-mentioned tank chamber 18 is connected to the head side pipe line 8 through a pilot check valve 20.
  • the pilot check valve 20 is oriented in a direction to allow the flow from the tank chamber 18 toward the head side pipe line 8.
  • the pilot check valve 20 is connected so as to introduce the fluid pressure in the rod side pipe line 10 as a pilot pressure, and be opened to make the head side pipe line 8 communicate with the tank chamber 18 when the fluid pressure in the rod side pipe line 10 is increased.
  • the rod side pipe line 10 is connected to the tank chamber 18 through a pilot check valve 22.
  • the pilot valve 22 is oriented in a direction to allow the flow from the tank chamber 18 toward the rod side pipe line 10.
  • the pilot check valve 22 is connected so as to introduce the fluid pressure in the head side pipe line 8 as a pilot pressure, and be opened to make the rod side pipe line 10 communicate with the tank chamber 18 when the fluid pressure in the head side pipe line 8 is increased.
  • the head side pipe line 8 and the rod side pipe line 10 are connected to the tank chamber 18 through relief valves 24, 26, respectively.
  • the relief valves 24, 26 may be provided when necessary.
  • a tank body 36 including a tubular outer cylinder 32 and a tubular inner cylinder 34 having a smaller diameter than the outer cylinder 32 and being formed within the outer cylinder 32.
  • the outer diameter of the outer cylinder 32 is designed to be approximately the same as the outer diameter of the electric motor 6.
  • the outer cylinder 32 and the inner cylinder 34 are arranged coaxially with each other.
  • a ring-shaped sliding cavity 38 is formed between the outer cylinder 32 and the inner cylinder 34, one end of the ring-shaped sliding cavity 38 being closed by a wall 40.
  • the wall 40 is mounted on one end of the electric motor 6, and thereby the tank body 36 is fixed to the electric motor 6.
  • a rotating shaft 42 of the electric motor 6 is provided so as to be positioned coaxially with the outer cylinder 32 and the inner cylinder 34.
  • a ring-shaped piston 44 sealed by O-rings 46, 48 is slidably inserted in the sliding cavity 38.
  • the sliding cavity 38 is divided into a preload chamber 50, on the side of the wall 40, and the tank chamber 18 by the piston 44.
  • a lid member 52 is mounted to the other end of the sliding cavity 38 defined by the outer cylinder 32 and the inner cylinder 34, thereby closing the tank chamber 18.
  • the lid member 52 is also inserted inside the inner circumference of the inner cylinder 34 so as to rotatably support a top end of the rotating shaft 42, through a bearing 54.
  • a pump chamber 56 is formed by being enclosed by the inner cylinder 34, the wall 40, and the lid member 52.
  • the rotating shaft 42 sealed by a seal 57, penetrates the pump chamber 56.
  • a cylinder block 58 engagingly attached to and integrally rotatable with the rotating shaft 42, is disposed within the pump chamber 56.
  • the cylinder block 58 is provided with a plurality of cylinder holes 60 bored in the axial direction. Through holes 62 are respectively bored adjacent to the cylinder holes 60, and pistons 64 are slidably inserted into the respective cylinder holes 60, so that cylinder chambers 66 are formed by the cylinder holes 60 and the pistons 64.
  • a valve plate 68 is provided between the cylinder block 58 and the lid member 52, such that the through holes 62 may communicate with the first port 2 and the second port 4 through a not-shown pair of port holes formed in the valve plate 68 in accordance with the rotation of the cylinder block 58
  • a shoe 70 provided to be spherically connected to one end of each of the pistons 64, is designed to slide on an anti-friction member 74 attached to a swash plate 72.
  • the swash plate 72 is firmly attached to the wall 40 of the tank body 36 so as to be restricted from rotation.
  • a coil spring 76 housed in the preload chamber 50, biases the piston 44 toward the tank chamber 18.
  • the preload chamber 50 which is connected to a connection port 78, is connected to an air pressure source 80 through the connection port 78.
  • the operating fluid is drawn from the head side port 14 of the fluid pressure cylinder 12 through the head side pipe line 8 into the first port 2 of the fluid pressure pump 1. Also, the pressure fluid is supplied from the second port 4, through the rod side pipe line 10, and the rod side port 16 to the fluid pressure cylinder 12.
  • a cylinder rod 86 is driven in a pulling direction.
  • the amount of the operating fluid discharged from the head side port 14 is different from the amount of the pressure fluid flowing in from the rod side port 16 by the volume of the cylinder rod 86.
  • the excess amount of the operating fluid is discharged through the head side pipe line 8 to the tank chamber 18, since the pilot check valve 20 is opened by the operation of the pilot pressure from the rod side pipe line 10.
  • the operation speed and the moving amount of the fluid pressure cylinder 12 can be controlled by controlling the electric motor 6.
  • the operating fluid is drawn from the second port 4 of the fluid pressure pump 1 through the rod side port 16 of the fluid pressure cylinder 12, and the rod side pipe line 10, while the pressure fluid is supplied to the fluid pressure cylinder 12 through the first port 2, the head side pipe line 8, and the head side port 14. Accordingly, the cylinder rod 86 is driven in a pushing direction.
  • the amount of the operating fluid discharged from the rod side port 16 is different from the amount of the pressure fluid flowing in from the head side port 14 by the volume of the cylinder rod 86 in the same manner as described above.
  • the deficient amount of the operating fluid is supplied from the tank chamber 18 to the rod side pipe line 10 through the pilot check valve 22, since the pressure in the rod side pipe line 10 is decreased, and thereby the pilot check valve 22 is opened.
  • the operating fluid is supplied to the rod side pipe line 10 through the pilot check valve 22 due to the preload applied to the tank chamber 18, which prevents the occurrence of cavitation on the drawing side of the fluid pressure pump 1.
  • both pilot check valves 20 and 20 are opened by the operating fluid pressure in the tank chamber 18 due to the preload of the compressed air from the air pressure source 80. Thereby, the pressure in the tank chamber 18 is introduced into the head side pipe line 8 and the rod side pipe line 10.
  • the fluid pressure is introduced through both ports 14 and 16 of the fluid pressure cylinder 12, and the cylinder rod 86 is made difficult to move by a small external force even if the external force is applied to the cylinder rod 86 and, therefore, is prevented from deflecting.
  • the tank chamber 18 is preloaded by the piston 44 regardless of the installation position of the tank body 36, there is no restriction on the installation position of the fluid pressure apparatus.
  • the circular tank chamber 18 is provided outside the fluid pressure pump 1, a sufficient volume of the tank chamber 18 can be secured and downsizing of the fluid pressure apparatus can be achieved.
  • the present invention is not limited to the above described embodiment.
  • the fluid pressure apparatus of the present invention presents an advantage that an appropriate preload pressure can be applied regardless of its installation position as well as an advantage that downsizing can be achieved.
  • a fluid pressure apparatus capable of applying an appropriate preload pressure regardless of its installation position and capable of being downsized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (5)

  1. Dispositif hydraulique muni d'une pompe hydraulique
    (1) entraînée par un moteur électrique (6) et pouvant tourner dans les deux sens, les deux accès d'un actionneur hydraulique (12) et les deux accès de la pompe hydraulique (1) étant respectivement connectés par l'intermédiaire de deux conduits (8, 10), dans lequel :
    une cavité de coulissement (38) est formée entre un cylindre externe (32) et un cylindre interne (34), la cavité de coulissement (38) étant divisée en une chambre de précharge (50) et une chambre réservoir (18) par un piston (44) inséré de façon coulissante dans la cavité de coulissement (38) ;
    la chambre réservoir (18) et les deux conduits sont connectés par l'intermédiaire de clapets anti-retour (20, 22) prévus respectivement dans des directions permettant d'évacuer du fluide de la chambre réservoir (18) vers l'actionneur hydraulique (12), la chambre réservoir (18) étant préchargée par l'intermédiaire du piston (44) par une pression d'air introduite dans la chambre de précharge (50) ; et
    la pompe hydraulique (1) est disposée dans le cylindre interne (34).
  2. Dispositif hydraulique selon la revendication 1, dans lequel la pompe hydraulique (1) est une pompe à piston à plateau oscillant.
  3. Dispositif hydraulique selon la revendication 1 ou 2, dans lequel le cylindre externe (32) et le cylindre interne (34) sont agencés coaxialement à un arbre de rotation (42) du moteur électrique (6), et le cylindre externe (32) et le cylindre interne (34) sont montés sur le moteur électrique.
  4. Dispositif hydraulique selon l'une quelconque des revendications 1 à 3, dans lequel la chambre réservoir (18) communique avec l'intérieur (82) du cylindre interne (34).
  5. Dispositif hydraulique selon l'une quelconque des revendications 1 à 4, dans lequel une extrémité supérieure de l'arbre de rotation (42) du moteur électrique (6) est portée à rotation par un élément de couvercle (52) fermant une extrémité du cylindre externe (32) et une extrémité du cylindre interne (34).
EP04716722A 2003-03-03 2004-03-03 Dispositif hydraulique Expired - Fee Related EP1600642B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2003056258A JP2004263806A (ja) 2003-03-03 2003-03-03 液圧装置
JP2003056258 2003-03-03
PCT/JP2004/002660 WO2004079205A1 (fr) 2003-03-03 2004-03-03 Dispositif hydraulique

Publications (3)

Publication Number Publication Date
EP1600642A1 EP1600642A1 (fr) 2005-11-30
EP1600642A4 EP1600642A4 (fr) 2007-07-04
EP1600642B1 true EP1600642B1 (fr) 2008-10-15

Family

ID=32958691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04716722A Expired - Fee Related EP1600642B1 (fr) 2003-03-03 2004-03-03 Dispositif hydraulique

Country Status (6)

Country Link
US (1) US20050175467A1 (fr)
EP (1) EP1600642B1 (fr)
JP (1) JP2004263806A (fr)
KR (1) KR20050105971A (fr)
DE (1) DE602004017135D1 (fr)
WO (1) WO2004079205A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4317862B2 (ja) 2006-09-15 2009-08-19 三菱重工業株式会社 軌道系交通システム
CN102454647A (zh) * 2010-10-20 2012-05-16 住友重机械工业株式会社 注射成型机及液压驱动器
US10871174B2 (en) 2015-10-23 2020-12-22 Aol Prime mover system and methods utilizing balanced flow within bi-directional power units
WO2020106291A1 (fr) * 2018-11-21 2020-05-28 Aoi (Advanced Oilfield Innovations, Dba A. O. International Ii, Inc.) Système de moteur principal et procédés faisant appel à un flux de fluide équilibré
DE102019215975A1 (de) * 2019-10-17 2021-04-22 Deere & Company Hydraulische Anordnung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457467A (en) * 1945-03-08 1948-12-28 Cons Vultee Aircraft Corp Electrically and hydraulically operated extensible strut
JPS61294201A (ja) * 1985-06-24 1986-12-25 Matsushita Electric Ind Co Ltd 油圧ユニツト
JPS63150102U (fr) * 1987-03-23 1988-10-03
JPS63176880A (ja) * 1988-01-12 1988-07-21 Ogura:Kk 油圧作動装置
US5144801A (en) * 1989-04-28 1992-09-08 Parker Hannifin Corporation Electro-hydraulic actuator system
JPH0960607A (ja) * 1995-08-23 1997-03-04 Opton Co Ltd 油圧駆動装置
JPH1026101A (ja) * 1996-07-10 1998-01-27 Opton Co Ltd 液圧装置
US20010023928A1 (en) * 2000-01-06 2001-09-27 Green David Kentfiled Electrohydraulic valve actuator
US6979185B2 (en) * 2000-08-01 2005-12-27 Kaempe Staffan I Bi-rotational pump/hydraulic actuator
FR2831226B1 (fr) * 2001-10-24 2005-09-23 Snecma Moteurs Actionneur electrohydraulique autonome

Also Published As

Publication number Publication date
WO2004079205A1 (fr) 2004-09-16
US20050175467A1 (en) 2005-08-11
KR20050105971A (ko) 2005-11-08
EP1600642A4 (fr) 2007-07-04
JP2004263806A (ja) 2004-09-24
DE602004017135D1 (de) 2008-11-27
EP1600642A1 (fr) 2005-11-30

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