US3760687A - Electro-hydraulic pulse motor - Google Patents

Electro-hydraulic pulse motor Download PDF

Info

Publication number
US3760687A
US3760687A US00207163A US3760687DA US3760687A US 3760687 A US3760687 A US 3760687A US 00207163 A US00207163 A US 00207163A US 3760687D A US3760687D A US 3760687DA US 3760687 A US3760687 A US 3760687A
Authority
US
United States
Prior art keywords
oil
hydraulic
hydraulic motor
pulse motor
pilot valve
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
US00207163A
Other languages
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
Original Assignee
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 US3760687A publication Critical patent/US3760687A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F03C1/06—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
    • 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
    • F03C1/0636—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 having rotary cylinder block
    • F03C1/0644—Component parts
    • F03C1/0663—Casings, housings
    • 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

Definitions

  • ABSTRACT The disclosure relates to an improved electro-hydraulic pulse motor having an arrangement wherein a novel tubular member is disposed in the chamber of the hydraulic motor part so that a drain opening provided in the chamber for returning the hydraulic fluid which has leaked out of the hydraulic motor part, is displaced in the direction of the output shaft of the hydraulic motor part and as a result of this, hydraulic fluid is always reserved in the chamber to enable lubrication of the moving elements of the hydraulic motor part, even if the electro-hydraulic pulse motor is used in the vertical position with the shaft vertically upward.
  • the present invention relates to an improvement of an electro-hydraulic pulse motor and more particularly relates to an improved internal structure of the hydraulic motor part of an electro-hydraulic pulse motor.
  • the electro-hydraulic pulse motor has a conventional arrangement in which principal the parts thereof consisting of an electric pulse motor, a rotary pilot valve and an axial piston hydraulic motor, are operatively coupled to each other by a reduction gear and a screwnut coupling having feedback operation and forming a feedback loop in a hydraulic circuit of the electrohydraulic pulse motor.
  • a predetermined amount of rotation of the electric pulse motor shaft in response to an electric pulse input is transmitted to the valve spool of the rotary pilot valve part by means of a reduction gear so as to cause rotation of the spool.
  • the rotation of the spool is transformed into an axial displacement of the valve spool by the above-mentioned screwnut coupling and the axial displacement of the spool opens an oil supply port provided for the rotary pilot valve part so as to introduce hydraulic fluid from the fluid power source actuating the hydraulic motor part to provide an amplified rotational output on the output shaft of the hydraulic motor part, the output being used for driving a machine on the one hand.
  • the output rotation of the hydraulic motor part restores the spool of the rotary pilot valve part again by means of the screw-nut coupling.
  • the electro-hydraulic pulse motor is often employed e.g. as a drive motor for a numerically controlled machine tool to provide a vertical feed motion to the machine tool, and in this case, the electro-hydraulic pulse motor must be mounted on the machine tool in a vertical position, that is, the output shaft thereof directs upwardly.
  • FIGURE shows a sectional view of an electrohydraulic pulse motor according to the present invention.
  • an electric pulse motor part I is shown coupled to a rotary type four way pilot valve part 2 having a valve spool 2a by means of a reduction gear 4 provided between one end portion of the spool 2a and the shaft la of the electric pulse motor part 1.
  • the rotary type four way pilot valve part 2 is also coupled to an axial piston type hydraulic motor part 3 by means of a feedback screw-nut coupling 5, coupling one end portion of the spool 2a to the output shaft 3d of the hydraulic motor part.
  • An oil supply line 6 introduces hydraulic fluid into a hydraulic motor part 3 from a hydraulic power source (not shown) via a fluid supply port 6a and the rotary type pilot valve part 2.
  • Reference numeral 7 shows an oil return line through which hydraulic fluid returns to the hydraulic power source via a fluid return port 7a.
  • Reference numeral 8 shows an oil line through which the inner chamber 3a of the hydraulic motor part 3 communicates with the oil return line 7. The return line 7 opens to the chamber 3a at a connecting portion 9.
  • a tubular member 10 is arranged in the chamber 3a so as to be either fixedly connected or threadedly engaged at one end thereof to the above-mentioned connecting portion 9.
  • the tubular member 10 extends along the output shaft 3d and has an oil drain opening 10a at the other end thereof.
  • the hydraulic fluid overflowing in the chamber 3a returns via the oil return line 7 through the bore of the tubular member 10 and also the oil line 8.
  • An electro-hydraulic pulse motor comprising an electric pulse motor:
  • a rotary type four way pilot valve having a stationary sleeve and a spool coupled to the electric pulse motor at one end part of the spool, the spool being rotatable and axially movable with respect to the stationary sleeve;
  • an axial piston type hydraulic motor having an inner chamber, a plurality of pistons operable within the inner chamber and an output shaft;
  • tubular member having two ends, said tubular member extending along said output shaft of said hydraulic motor and disposed within said inner chamber of said hydraulic motor, one end of said tubular member being fixed within the bottom portion of said inner chamber and the other end constituting an oil drain opening;
  • third oil line means connected between said one end of said tubular member and said return line of said first oil line means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Hydraulic Motors (AREA)
  • Servomotors (AREA)
US00207163A 1970-12-26 1971-12-13 Electro-hydraulic pulse motor Expired - Lifetime US3760687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970131959U JPS4845597Y1 (enExample) 1970-12-26 1970-12-26

Publications (1)

Publication Number Publication Date
US3760687A true US3760687A (en) 1973-09-25

Family

ID=15070203

Family Applications (1)

Application Number Title Priority Date Filing Date
US00207163A Expired - Lifetime US3760687A (en) 1970-12-26 1971-12-13 Electro-hydraulic pulse motor

Country Status (5)

Country Link
US (1) US3760687A (enExample)
JP (1) JPS4845597Y1 (enExample)
DE (1) DE2163456A1 (enExample)
FR (1) FR2119725A5 (enExample)
GB (1) GB1369244A (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4503888A (en) * 1983-10-04 1985-03-12 Mts Systems Corporation Servovalve spool control for digital rotary servovalve
US5036659A (en) * 1989-11-13 1991-08-06 Sundstrand Corporation Swash plate type pump with flow path through cavity containing swash plate
EP1092868A3 (en) * 1999-10-13 2004-02-04 Teijin Seiki Co., Ltd. Electro-hydraulic servomotor
CN102797621A (zh) * 2012-08-13 2012-11-28 台州帕克兰液压机械有限公司 一种曲轴连杆式液压马达

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015101A1 (de) * 1990-05-11 1991-11-14 Eckehart Schulze Hydraulische antriebsvorrichtung
CN104806441A (zh) * 2015-04-13 2015-07-29 武汉海力威机电科技有限公司 一种内闭环伺服液压马达及其控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3361077A (en) * 1964-07-09 1968-01-02 Lucas Industries Ltd Pumps
US3530764A (en) * 1967-12-27 1970-09-29 Toyoda Machine Works Ltd Electro-hydraulic servomotor
US3623402A (en) * 1970-07-06 1971-11-30 Abex Corp Hydraulic motor drive
US3662858A (en) * 1970-08-27 1972-05-16 Gen Motors Corp Self-purging lubricant reservoir

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3361077A (en) * 1964-07-09 1968-01-02 Lucas Industries Ltd Pumps
US3530764A (en) * 1967-12-27 1970-09-29 Toyoda Machine Works Ltd Electro-hydraulic servomotor
US3623402A (en) * 1970-07-06 1971-11-30 Abex Corp Hydraulic motor drive
US3662858A (en) * 1970-08-27 1972-05-16 Gen Motors Corp Self-purging lubricant reservoir

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4503888A (en) * 1983-10-04 1985-03-12 Mts Systems Corporation Servovalve spool control for digital rotary servovalve
US5036659A (en) * 1989-11-13 1991-08-06 Sundstrand Corporation Swash plate type pump with flow path through cavity containing swash plate
EP1092868A3 (en) * 1999-10-13 2004-02-04 Teijin Seiki Co., Ltd. Electro-hydraulic servomotor
CN102797621A (zh) * 2012-08-13 2012-11-28 台州帕克兰液压机械有限公司 一种曲轴连杆式液压马达

Also Published As

Publication number Publication date
FR2119725A5 (enExample) 1972-08-04
DE2163456A1 (de) 1972-07-06
GB1369244A (en) 1974-10-02
JPS4845597Y1 (enExample) 1973-12-27

Similar Documents

Publication Publication Date Title
US1943061A (en) Hydraulic drive for machine tools
US2300009A (en) Power transmission
US4603616A (en) Rotary actuator
GB1009572A (en) Hydraulic axial piston-type machine
US3357362A (en) Hydrostatic power unit
US3760687A (en) Electro-hydraulic pulse motor
US3222991A (en) Bearing preload mechanism for machine tool
US4041800A (en) Stroke length adjusting devices
US2676571A (en) Hydraulic linear motor
US4753071A (en) Self-powered rotating-cylinder type linear actuator utilizing rotation-generated centrifugal head for piston positioning
US3115751A (en) Hydraulic reciprocatory device
US2014162A (en) Hydraulic press
GB2064700A (en) Ball piston
US3190190A (en) Rotary actuator
US2346254A (en) Pump stroke varying structure
US2612113A (en) Pumping unit
US2028850A (en) Machine tool feed
RU1798136C (ru) Устройство дл абразивной обработки
JP2538434Y2 (ja) 電油サーボアクチュエータ
US2502234A (en) Control for hydraulic motors
GB2038672A (en) Feed drive system
US2846903A (en) Machine tools with a hydraulic feed arrangement for a rotating spindle supporting the tool
US2971341A (en) Machine tool control means
US1206387A (en) Hydraulic variable and differential speed gear.
US1112632A (en) Control apparatus for power-driven mechanisms.