US3752038A - Electro-hydraulic pulse motor - Google Patents

Electro-hydraulic pulse motor Download PDF

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Publication number
US3752038A
US3752038A US00207105A US3752038DA US3752038A US 3752038 A US3752038 A US 3752038A US 00207105 A US00207105 A US 00207105A US 3752038D A US3752038D A US 3752038DA US 3752038 A US3752038 A US 3752038A
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US
United States
Prior art keywords
pulse motor
hydraulic
electro
valve spool
screw
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
US00207105A
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English (en)
Inventor
S Inaba
K Ito
K Shimizu
Y Amemiya
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.)
Fujitsu Ltd
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Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Application granted granted Critical
Publication of US3752038A publication Critical patent/US3752038A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F15B9/14—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 rotary servomotors
    • 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
    • F03C1/0678—Control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/924—Coupled nut and bolt
    • Y10S411/95—Rachet and nut-carried pawl

Definitions

  • Kanagaiva-ken Japan Filed: iiZEf lifi 97l-f Appl. No.2 207,105
  • ABSTRACT This disclosure relates to an improved electrohydraulic pulse motor having an arrangement wherein novel stop means are provided for screw-nut coupling which couples the four-way pilot valve part to the hydraulic motor part while providing a feedback loop in the operation of the electro-hydraulic pulse motor so that the axial motion of a valve spool of the four-way pilot valve part which motion is driven by the electric pulse motor part, is properly restricted so as not to fail in delivering control action to the hydraulic line formed in the electro-hydraulic pulse motor.
  • the present invention relates to an improvement of an electro-hydraulic pulse motor and more particularly relates to an improved internal structure of the feedback screw-nut coupling of an electro-hydraulic pulse motor.
  • the conventional electro-hydraulic pulse motor has an arrangement in which the principal parts thereof consisting of an electric pulse motor, a rotary-type four-way pilot valve and an axial piston hydraulic motor, are operatively coupled to each other by a reduction gear and a screw-nut coupling having feedback operation and forming a feedback loop in the hydraulic line of the electro-hydraulic pulse motor.
  • a predetermined amount of rotation of the electric pulse motor shaft in response to the impression of an electric pulse or of electric pulse train to the input of the electric pulse motor, is transmitted to the valve spool of the four-way pilot valve part by means of the reduction gear so as to cause rotation of the valve spool.
  • the rotation of the valve spool is transformed into an axial shift of the valve spool by the abovementioned screw-nut coupling and the axial shift of the valve spool from the initial neutral position opens an oil supply port provided for the four-way pilot valve part so as to introduce hydraulic fluid from the fluid power source actuating the hydraulic motor part to provide a large torque on theshaft of the hydraulic motor part which is also the output shaft of the electro-hydraulic pulse motor, the output being used for driving, e.g., a machine on the one hand.
  • the output rotation of the hydraulic motor part restores the valve spool of the four-way pilot valve part to the neutral position thereof, where the hydraulic line is blocked, again by means of the screw-nut coupling, and one cycle of operation of the. electro-hydraulic'pulse motor is finished with respect to a pulse input impressed thereto.
  • the object of the present invention is to provide an electro-hydraulic pulse motor provided with an internal structure capable of eliminating the above-mentioned drawback.
  • FIG. I is a sectional view of an electro-hydraulic pulse motor
  • FIG. 2 is a partial view of a stopping sturcture of the valve spooldevised generally and conventionally;
  • FIG. 3 is a partially sectional view of a stopping structure of the valve spool provided in an electrohydraulic pulse motor according to the present invention.
  • FIG. 1 shows the overall arrangement of an electrohydraulic pulse motor, input I is arranged at electric pulse motor part 2, and an electric pulse signal is impressed to the input 1.
  • the electric pulse motor part 2 is coupled to a rotary type four way pilot valve part 4 having a sleeve 7 and valve spool 5 by means of a reduction gear 3 provided between one end portion of the spool 5 and the shaft of the electric pulse motor part 2.
  • The. rotary type four way pilot valve part 4 is also coupled to an axial piston type hydraulic motor part 6 by means of a feedback screw-nut coupling formed by a screw 9 threaded at one end portion of the valve spool 5 and a nut 8 threaded at an inner end portion of shaft 6' of the hydraulic motor part 6.
  • Reference numerals Ill and 12 shown in FIG. I are oil supply and return port connected to the ports of the four way pilot erally and conventionally devised to restrict the amount of axial shift of the valve spool 5 to a predetermined value in order to avoid disconnection of the coupling between screw 7 and nut 8. That is, stop projections 13 and 13' are made at the end walls of screw nut 8 and the inside of the casing of an electro-hydraulic pulse motor.
  • valve spool 5 rotates with the shaft 6' of hydraulic motor part 6 in a unitary condition through over tight contact of the spool 5 and projection 13 of nut 8 when the hydraulic motor part 6 is actauted by I hydraulic fluid force introduced by the four way pilot .valve part 4 and therefore, the valve spool 5 is prevented from being restored to the initial neutral position thereof.
  • means to properly restrict the axial motion of the valve spool 5 is provided so that the above-mentioned drawback can be completely eliminated.
  • FIG. 3 which illustrates an embodiment of the present invention
  • a stop member It! is disposed at a side wall portion of nut 8
  • valve spool 5' is provided with'a channel 15 between screw 9 and stem portion 16, which co-operates with stop member 10 so as to restrict the shifting motion of spool 5' shown by an arrow in FIG. 3, relative to shaft 6' of hydraulic motor part 6, to a predetermined value. That is, the end I9 of valve spool 5' does not make any contact with the end face 14 of nut 8. Also, as shown in FIG.
  • the channel 15 has a predetermined amount of axial width corresponding to the predetermined amount of shift of valve spool 5' and is formed in a skewed state at the same skewing angle as the lead angle of screw 7.
  • the rotationally shifting valve spool 5' comes into contact with stop member 10 embedded in the side wall'portion of nut 8, at both end portions 17 and 18 of valve spool 5 but without being affected by the above-mentioned large thrust force produced on valve spool 5.
  • the stop member is arranged so as to be rigidly embedded in nut 8 as shown in FIG. 3, so that it can sufficiently bear the load given by valve spool 5.
  • the electrohydraulic pulse motor of the present invention can never be subject to the above-mentioned accident.
  • the present invention is illustrated in accordance with a preferred embodiment.
  • the'structure is of course applicable to the case where the screw 7 is formed at the end of shaft 6' of the hydraulic motor part 6 and nut 8 is formed at the end of valve spool 5 of the four-way pilot valve part 4.
  • An electro-hydraulic pulse motor comprising an electric pulse motor
  • a rotary pilot valve including a sleeve and a valve spool inserted in the sleeve to be axially slideable with respect to said sleeve and operatively associated with the electric pulse motor;
  • stop means comprising a channel formed in said screw, stop ends fonned in opposing ends of the channel, and a stop member disposed in said nut radially projecting into the channel whereby relative rotational motion between the screw and the nut as well as axial movement of the valve spool is restricted to a predetermined magnitude due to contact of the stop member and the respective stop ends of the channel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Servomotors (AREA)
  • Transmission Devices (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Control Of Position Or Direction (AREA)
US00207105A 1970-12-26 1971-12-13 Electro-hydraulic pulse motor Expired - Lifetime US3752038A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970131958U JPS5129440Y1 (enExample) 1970-12-26 1970-12-26

Publications (1)

Publication Number Publication Date
US3752038A true US3752038A (en) 1973-08-14

Family

ID=15070176

Family Applications (1)

Application Number Title Priority Date Filing Date
US00207105A Expired - Lifetime US3752038A (en) 1970-12-26 1971-12-13 Electro-hydraulic pulse motor

Country Status (5)

Country Link
US (1) US3752038A (enExample)
JP (1) JPS5129440Y1 (enExample)
DE (1) DE2164819C3 (enExample)
FR (1) FR2119724A5 (enExample)
GB (1) GB1369245A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051765A (en) * 1974-07-23 1977-10-04 Nisshin Sangyo Co., Ltd. Electric-hydraulic pulse motor having an improved rotary guide valve means
US4426912A (en) 1980-10-23 1984-01-24 Commissariat A L'energie Atomique Apparatus for the continuous adjustment of a jack piston stroke
US4503888A (en) * 1983-10-04 1985-03-12 Mts Systems Corporation Servovalve spool control for digital rotary servovalve

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH657433A5 (de) * 1981-09-14 1986-08-29 Sig Schweiz Industrieges Vorrichtung zur begrenzung des drehwinkels bei schraubengetrieben und fluidische regeleinrichtung.
EP1505468B1 (de) * 1998-05-28 2006-07-19 Weber-Hydraulik GmbH Baueinheit
DE59913690D1 (de) * 1998-05-28 2006-08-31 Weber Hydraulik Gmbh Baueinheit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051765A (en) * 1974-07-23 1977-10-04 Nisshin Sangyo Co., Ltd. Electric-hydraulic pulse motor having an improved rotary guide valve means
US4426912A (en) 1980-10-23 1984-01-24 Commissariat A L'energie Atomique Apparatus for the continuous adjustment of a jack piston stroke
US4503888A (en) * 1983-10-04 1985-03-12 Mts Systems Corporation Servovalve spool control for digital rotary servovalve

Also Published As

Publication number Publication date
DE2164819B2 (de) 1973-08-09
DE2164819A1 (de) 1972-07-06
GB1369245A (en) 1974-10-02
FR2119724A5 (enExample) 1972-08-04
DE2164819C3 (de) 1974-03-14
JPS5129440Y1 (enExample) 1976-07-24

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