US3858484A - Hydraulic, rotary servo-actuator - Google Patents

Hydraulic, rotary servo-actuator Download PDF

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Publication number
US3858484A
US3858484A US407629A US40762973A US3858484A US 3858484 A US3858484 A US 3858484A US 407629 A US407629 A US 407629A US 40762973 A US40762973 A US 40762973A US 3858484 A US3858484 A US 3858484A
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United States
Prior art keywords
input shaft
hydraulic
passageways
hydraulic fluid
actuator
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Expired - Lifetime
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US407629A
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English (en)
Inventor
Youichi Saida
Hajime Ito
Kojiro Imanaga
Tomoji Jyumonji
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Mitsubishi Metal Corp
Mitsubishi Materials Corp
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Mitsubishi Metal Corp
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Assigned to MITSUBISHI MATERIALS CORPORATION reassignment MITSUBISHI MATERIALS CORPORATION CHANGE OF ADDRESS Assignors: MITSUBISHI KINZOKU KABUSHIKI KAISHA, 5-2, OTEMACHI 1-CHOME, CHIYODA-KU, TOKYO-TO
Assigned to MITSUBISHI MATERIALS CORPORATION reassignment MITSUBISHI MATERIALS CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MITSUBISHI KINZOKU KABUSHIKI KAISHA, 5-2, OTEMACHI 1-CHOME, CHIYODA-KU, TOKYO-TO
Assigned to MITSUBISHI KINZOKU KABUSHIKI KAISHA reassignment MITSUBISHI KINZOKU KABUSHIKI KAISHA CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MITSUBISHI KINZOKU KOGYO KABUSHIKI KAISHA, 6, OTEMACHI 1-CHOME, CHIYODA-KU, TOKYO-TO
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    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/10—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage

Definitions

  • ABSTRACT A hydraulic, rotaryservo-actuator of the type having a casing, a first control valve, an input shaft provided therewithin with hydraulic fluid supply and discharge passageways, and a hydraulically actuated member further has other hydraulic fluid supply and discharge passageways formed within its casing and respectively communicating with a fluid supply source and a fluid reservoir both outside the servo-actuator and a second control valve formed within the casing and operating to communicate and shut off selectively these other passageways respectively with and from the passageways formed within the input shaft thereby to prevent excessive actuated movement of the hydraulically actuated member.
  • This invention relates to hydraulic-type, rotaryaction servo-actuators and more particularly to a servoactuator of this type provided with an input shaft and an output shaft coaxially disposed relative to the input shaft and rotatably fitted on the inner part thereof and having a servo-valve at the fitted surfaces of the input and output shafts.
  • a servo-actuator of this type is provided with a servovalve which, structurally, is built-in at the mutually fitted surfaces of the input shaft and the output shaft and is adapted to return automatically to the neutral position when the output shaft rotates in response to a rotation of the input shaft. For this reason, there is no risk of the output shaft rotating excessively beyond a predetermined maximum rotational angle under normal operational conditions.
  • an object of the invention is to provide a hydraulic, rotary servo-actuator of the type referred to above in which, without externally installing a special rotation control mechanism, excessive rotation of the output shaft is prevented by safety means comprising a control valve provided in built-in state at the fitted surfaces of the input shaft and the cylindrical enclosure and operating when the output shaft in rotation reaches an angular posit-ion just short of the above mentioned limiting maximum angle to shut off either one or both of the hydraulic fluid supply to a fluid supply path and the fluid discharge from a fluid discharge.
  • a hydraulic, rotary servo-actuator comprising: a closed cylindrical enclosure having therewithin a plurality of hydraulic action chambers; an input shaft rotatably supported along the central axis of the cylindrical enclosure by a wall part thereof and having a part extending in the interior of the enclosure; an actuated member having a part passing through a wall of the enclosure and having a central axial bore, into which the input shaft is rotatably fitted, and further having a rotor part provided with hydraulically actuated parts movably disposed within the hydraulic action chambers; and a first control valve provided in the central axial bore and operating to communicate the hydraulic action chambers selectively with hydraulic fluid supply and discharge passageways formed within the input shaft, the servo-actuator being characterized in that-other hydraulic fluid supply and discharge passageways respectively communicating with a hydraulic fluid supply source and a hydraulic fluid reservoir both outside of the servo-actuator are formed within a wall of the enclosure, and in that a second control valve for operating
  • FIG. 1 is a side view, for the most part in longitudinal section, showing the essential parts of one example of the hydraulic, rotary servo-actuator according to the invention
  • FIG. 2 is a cross section taken along the plane indicated by line II II in FIG. 1 as viewed in the arrow direction;
  • FIG. 3a is a diagrammatic end view showing the rotor of the servo-actuator in neutral position
  • FIG. 3b is a diagrammatic end view indicating a second control valve in neutral position
  • FIG. 4a is a diagrammatic end view showing the rotor in a clockwise rotated position
  • FIG. 4b is a diagrammatic end view indicating the state of the second control valve corresponding to the state of rotor indicated in FIG. 4a;
  • FIG. Sa is a diagrammatic end view showing the rotor in a counterclockwi'sely rotated position
  • FIG. 5b is a diagrammatic end view indicating the state of the second control valve corresponding to the state of the rotor indicated in FIG. 5a;
  • FIG. 6 is a diagrammatic projection of a hydraulic fluid groove as viewed in the direction of the arrow A in FIG. 4b.
  • FIG. 1 there is illustrated an example-of a hydraulic, rotary servo-actuator 10 according to this invention the principal structural parts of which are a cylindrical enclosure 1 having two ends respectively closed by end walls 4 and S of disc shape, an output shaft 2 formed integrally and coaxially with a rotor part 7 accommodated rotatably within the enclosure 1, the ends of the output shaft 2 extending out through central journal holes 4A and 5B in the end walls 4 and 5, respectively, and an input shaft 3 rotatably and coaxially fitted within an axial bore formed in the output shaft from its end extending out through the central hole 58 to the middle part of the rotor 7.
  • the cylindrical enclosure 1 is provided in its interior with two longitudinal partition walls 6A and 6B extending radially inward to the rotor part 7 and disposed in substantially diametrically opposite positions.
  • the outer surface of the rotor part 7 is engaged in a liquidtight yet slidable manner with the innermost edges of the partition walls 6A and 6B.
  • the rotor part 7 is provided with pressure-actuated members 7A and 7B of vane-like shape secured unitarily at their base parts to the rotor part 7 on substantially diametrically opposite sides thereof and extending radially outward therefrom to the inner cylindrical surface of the cylindrical enclosure 1, where the outermost tips of the vanes 7A and 7B are engaged in a liquid-tight yet slidable manner with the inner surface of the enclosure
  • four hydraulic action chambers 30, 31, 32, and 33 are formed between the inner surface of-the cylindrical enclosure 1 and the outer cylindrical surface of the rotor part 7 by these surfaces, the partition walls 6A and 6B, and the vanes 7A and 7B.
  • a control valve or a servo-valve 8 is provided at the fitting surfaces of the output shaft 2 and the input shaft 3 slidablyfitting thereinto.
  • This control valve 8 is formed by hydraulic fluid recesses or grooves 9A and 9Bformed in the inner wall surface of the aforementioned central bore 12 of the output shaft 2 and hydraulic fluid recesses or grooves 11A and 118 formed in the outer surface of the input shaft 3.
  • the fluid grooves 9A and 9B are communicatively connected via suitable passageways to the aforedescribed hydraulic action chambers and 32 and hydraulic action chambers 31 and 33, respectively.
  • the input shaft3 is provided therewithin with longitudinal hydraulic fluid passageways 13 and 14.
  • the passageway 13 for fluid supply opens at one end thereof intothe above mentioned fluid groove 118 formed on the outer surface of theinput shaft 3 and is communicatively connected at its other end by way of a 'mechanism to be described hereinafter to a hydraulic fluid supply source (not shown) outside of the actuator.
  • hydraulic fluid supply passageway 13 of the input shaft I coincides with the fluid groove 9A communicating with the aforementioned hydraulic action chambers 30 and 32, while the fluid groove 1 1A communicating with the fluid discharge passageway 14 of the input shaft registers with the fluid groove 98 communicating with the hydraulic action chambers 31 and 33, hydraulic fluid is supplied into the hydraulic action chambers 30 and 32, while hydraulic fluid is discharged from the hydraulic action chambers 31 and 33.
  • the rotor 7 is rotated in the clockwise direction as viewed in FIG. 3a until it reaches the state indicated in FIG. 4a.
  • a vitally important feature of this invention lies in the provision of a separate control valve 50 for limiting the quantity of the hydraulic fluid entering the fluid chambers thereby to prevent the pressure-actuated vane members 7A and 7B of the rotor 7 from colliding with the longitudinal partition walls 6A and 6B of the cylin drical enclosure 1 at the time of rotation, this control valve 50 being provided at the slidably fitted surfaces of the input shaft 3, the output shaft 2, and the end wall 5 of the enclosure 1.
  • the right end (as viewed in FIG. 1) of the output shaft 2, being provided with a central bore 12, for rotatably accommodate the input shaft 3, has the shape of a sleeve 2S rotatably fitted in the journal hole 58 of the end wall 5 as mentioned hereinbefore.
  • the end wall 5 is provided with a hydraulic fluid supply inlet 17 and discharge outlet 18, which are respectively connected by suitable piping (not shown) to the aforementioned hydraulic fluid supply source and reservoir.
  • the inlet 17 and the outlet 18 on their inner sides are communicatively connected by a hydraulic fluid supply passageway 15 and a hydraulic fluid discharge passageway 16, respectively to the journal bore 58.
  • the sleeve-shaped part 25 of the output shaft 2 is provided in its outer peripheral surface with arcuate fluid grooves 19 and 20 adapted to communicate with the fluid supply passageway 15 and discharge passageway 16 at their endsopening into the bore 58 in accordance with the angular position of the output shaft 2.
  • the fluid grooves 19and 20 are communicatively connected respectively by radially extending passageways 21 and 22 in the output shaft 2'to the central bore 12 of the output shaft 2.
  • the input shaft 3 is provided in its outer peripheral surface with arcuate fluid grooves 23 and 24 communicatively connected on their inner sides to the aforedescribed fluid supply passageway 13 and fluid discharge passageway 14, respectively. Furthermore, these fluid grooves 23 and 24 are adapted to communicate on their outer sides with the inner open ends of the above mentioned radial passageways 21 and 22 provided in the sleeve part 28 of the output shaft 2.
  • the fluid supply passageway 13 in the input shaft 3 is in communication by way of the arcuate fluid groove 23, the radial passageway 21, the arcuate groove 19, and the radial supply passageway 15 with the fluid inlet 17, while the fluid discharge passageway 14 is in communication by way of the arcuate groove 24, the radial passageway 22, the arcuate groove 20, and the radial discharge passageway 16 with the fluid outlet 18.
  • the ledge or shoulder 198 of the fluid groove 19 can be caused to close the fluid supply passageway in the end wall 5 thereby to shut off the supply of hydraulic fluid to the supply passageway 13 within the input shaft 3. Consequently, at a stage prior to the action of the control valve 8, which is an essential characteristic of 5 this actuator, the fluid supply is shut off. Therefore, the control valve 50 comprising the arcuate grooves 19 and of the output shaft 2 and the hydraulic fluid supply and discharge passageways l5 and 16 of the end wall 5 constitutes a safety device for preventing excessive rotation of the rotor 7.
  • the neutral position of the control valve 50 is dia' grammatically indicated in FIG. 3b, while its operational position at the time when the output shaft 2 has rotated counterclockwise is indicated in FIG. 4b.
  • the width of the arcuate fluid groove 19 is reduced at its end as indicated in FlG. 6.
  • a hydraulic, rotary servo-actuator comprising:
  • an actuated member comprising a part having a central axial bore, into which said input shaft is rotatably fitted, a rotor part provided with hydraulically actuated parts movably disposed within said chambers, and an output shaft connected unitarily to said rotor part;
  • a first control valve provided in said input shaft and central axial bore and operating to communicate the chambersselectively with hydraulic fluid supply and discharge passageways formed within the input shaft;
  • a second control valve provided within the input shaft and central axial bore and operating interrelatedly with said first control valve to communicate and shut off selectively said other supply and discharge passageways respectively with and from the aforesaid passageways formed within the input shaft thereby to prevent excessive actuated movement of said hydraulically actuated parts.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Servomotors (AREA)
  • Fluid-Driven Valves (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US407629A 1972-10-21 1973-10-18 Hydraulic, rotary servo-actuator Expired - Lifetime US3858484A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10486272A JPS5310235B2 (enrdf_load_stackoverflow) 1972-10-21 1972-10-21

Publications (1)

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US3858484A true US3858484A (en) 1975-01-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US407629A Expired - Lifetime US3858484A (en) 1972-10-21 1973-10-18 Hydraulic, rotary servo-actuator

Country Status (9)

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US (1) US3858484A (enrdf_load_stackoverflow)
JP (2) JPS5310235B2 (enrdf_load_stackoverflow)
CA (1) CA991054A (enrdf_load_stackoverflow)
DE (1) DE2352799A1 (enrdf_load_stackoverflow)
FR (1) FR2203943B1 (enrdf_load_stackoverflow)
GB (1) GB1435215A (enrdf_load_stackoverflow)
IT (1) IT998791B (enrdf_load_stackoverflow)
SE (1) SE402021B (enrdf_load_stackoverflow)
SU (1) SU1022668A3 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177713A (en) * 1975-05-12 1979-12-11 The Garrett Corporation Electrohydraulic proportional actuator apparatus
US4485726A (en) * 1979-05-10 1984-12-04 Jidosha Kiki Co., Ltd. Assistor for transmission
DE3545907A1 (de) * 1984-12-26 1986-07-10 Hitachi, Ltd., Tokio/Tokyo Drehventil

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5416314U (enrdf_load_stackoverflow) * 1977-07-07 1979-02-02
JPS5959066U (ja) * 1982-10-09 1984-04-17 株式会社リコー 読取装置
JPS59111464A (ja) * 1982-12-16 1984-06-27 Konishiroku Photo Ind Co Ltd 画像読取装置
JPS59217004A (ja) * 1983-05-20 1984-12-07 Matsushita Electric Ind Co Ltd 流体サ−ボアクチエ−タ
JPS6145238A (ja) * 1984-08-09 1986-03-05 Fuji Xerox Co Ltd スリツト露光装置
DE3535885A1 (de) * 1985-10-08 1986-05-07 Manfred Dipl.-Ing. 7052 Schwaikheim Egner Fluidischer gelenkantrieb
FR2607200B1 (fr) * 1986-11-26 1991-09-06 Applic Mach Motrices Dispositif actionneur hydraulique rotatif a palette, destine notamment a l'entrainement d'une gouverne d'aeronef
JPH03268513A (ja) * 1990-03-16 1991-11-29 Fujitsu Ltd クロック信号断検出方式

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1876104A (en) * 1930-11-29 1932-09-06 Tucker Gilmore Mfg Company Steering mechanism
US2260979A (en) * 1938-04-15 1941-10-28 George G Morin Hydraulic device
US2372710A (en) * 1941-12-11 1945-04-03 Houdaille Hershey Corp Hydraulic steering motor and shimmy dampener for airplane landing gear wheels
US2613649A (en) * 1948-10-22 1952-10-14 G G Bakewell Steering motor for airplane landing wheels
US3732027A (en) * 1970-06-18 1973-05-08 K Lupke Method and apparatus for converting digital input signals into distinct output positions or velocities

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE865403C (de) * 1939-12-19 1953-02-02 Kloeckner Humboldt Deutz Ag Hydraulische Schaltvorrichtung
US2447825A (en) * 1942-02-06 1948-08-24 Leonard Pelham Lee Pressure fluid servomotor
US2475445A (en) * 1946-11-16 1949-07-05 Vickers Inc Servomotor with rotary input and rectilinear output
FR1090588A (fr) * 1953-09-26 1955-03-31 Rech Etudes Production Sarl Servo-mécanisme pour l'asservissement de deux arbres en rotation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1876104A (en) * 1930-11-29 1932-09-06 Tucker Gilmore Mfg Company Steering mechanism
US2260979A (en) * 1938-04-15 1941-10-28 George G Morin Hydraulic device
US2372710A (en) * 1941-12-11 1945-04-03 Houdaille Hershey Corp Hydraulic steering motor and shimmy dampener for airplane landing gear wheels
US2613649A (en) * 1948-10-22 1952-10-14 G G Bakewell Steering motor for airplane landing wheels
US3732027A (en) * 1970-06-18 1973-05-08 K Lupke Method and apparatus for converting digital input signals into distinct output positions or velocities

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177713A (en) * 1975-05-12 1979-12-11 The Garrett Corporation Electrohydraulic proportional actuator apparatus
US4485726A (en) * 1979-05-10 1984-12-04 Jidosha Kiki Co., Ltd. Assistor for transmission
DE3545907A1 (de) * 1984-12-26 1986-07-10 Hitachi, Ltd., Tokio/Tokyo Drehventil
US4735233A (en) * 1984-12-26 1988-04-05 Hitachi, Ltd. Rotary valve

Also Published As

Publication number Publication date
JPS4967083A (enrdf_load_stackoverflow) 1974-06-28
FR2203943B1 (enrdf_load_stackoverflow) 1976-11-19
JPS5310235B2 (enrdf_load_stackoverflow) 1978-04-12
JPS504494A (enrdf_load_stackoverflow) 1975-01-17
FR2203943A1 (enrdf_load_stackoverflow) 1974-05-17
GB1435215A (en) 1976-05-12
DE2352799A1 (de) 1974-05-02
IT998791B (it) 1976-02-20
CA991054A (en) 1976-06-15
SE402021B (sv) 1978-06-12
SU1022668A3 (ru) 1983-06-07

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Owner name: MITSUBISHI KINZOKU KABUSHIKI KAISHA

Free format text: CHANGE OF NAME;ASSIGNOR:MITSUBISHI KINZOKU KOGYO KABUSHIKI KAISHA, 6, OTEMACHI 1-CHOME, CHIYODA-KU,TOKYO-TO;REEL/FRAME:005797/0034

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Effective date: 19910222