US3752001A - Electro-hydraulic pulse motor - Google Patents

Electro-hydraulic pulse motor Download PDF

Info

Publication number
US3752001A
US3752001A US00207164A US3752001DA US3752001A US 3752001 A US3752001 A US 3752001A US 00207164 A US00207164 A US 00207164A US 3752001D A US3752001D A US 3752001DA US 3752001 A US3752001 A US 3752001A
Authority
US
United States
Prior art keywords
pulse motor
housing
motor
valve
hydraulic
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
US00207164A
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 US3752001A publication Critical patent/US3752001A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/12—Arrangements for adjusting or for taking-up backlash not provided for elsewhere
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • F16H2057/0222—Lateral adjustment
    • F16H2057/0224—Lateral adjustment using eccentric bushes
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19623—Backlash take-up

Definitions

  • the electro-hydraulic pulse motor has a conventional arrangement in which the principal components 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 application 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 way of a 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 above-mentioned screw-nut coupling.
  • the axial shift of the valve spool from the initial neutral position opens an oil supply port provided in the four way pilot valve so as to introduce hydraulic fluid from a fluid power source into the hydraulic circuit for actuating the hydraulic motor.
  • This provides a large torque on the shaft of the hydraulic motor, which serves also as the output shaft of the electro-hydraluic pulse motor.
  • the output is used for driving a machine, for example on the one hand.
  • the output rotation of the hydraulic motor restores the valve spool of the four way pilot valve to the neutral position thereof whereupon the hydraulic circuit is blocked again by means of the screw-nut coupling, and one cycle of operation of the electro-hydraluic pulse motor is finished with respect to a pulse applied thereto.
  • the electro-hydraulic pulse motor having the above-mentioned arrangement is used as a control element in a control system
  • the electro-hydraulic pulse motor is required to have the best possible response characteristics with respect to incoming pulses, such as follow-up characteristics of the pilot valve, accuracy of the rotation of the output shaft thereof,and linearity of the output torque relative to change of the incoming inputs.
  • a rotatably fitted eccentric ring has conventionally been arranged in the prior art at the connecting portion between the electric pulse motor and the four way pilot valve so that the adjusting operation
  • the object of the present invention is to provide an improved electro-hydraulic pulse motor eliminating the above-mentioned defects.
  • FIG. 1 is a sectional view schematically showing a part of the conventional electro-hydraulic pulse motor
  • FIG. 2 is a schematic view taken along line 22 of FIG. 1;
  • FIG. 3 is an over-all perspective view including a partially cut out portion of an electro-hydraluic pulse motor according to the present invention
  • FIG. 4 is a schematical view taken along line 4-4 of FIG. 3.
  • an eccentric ring 14 is rotatably fitted to an electric pulse motor part 11, while the housing 13 of four way pilot valve part 12 is fitted to the periphery of the eccentric ring 14.
  • the eccentric ring 14 can be rotated by using a suitable tool through aperture 17 formed at a position in housing 13.
  • a slight rotation of the eccentric ring 14 causes radial displacement between the electric pulse motor part 11 and the four way pilot valve part 12, so that backlash present between gear 15 of the electric pulse motor part 11 and gear 16 of the four way pilot valve part 12 changes. Therefore, a properly adjusted rotation of eccentric ring 14 provides a properly adjusted backlash between the engagement of gears 15 and 16 which act as reduction gears.
  • aperture 17 has the defect that fine dust or other foreign material enters the interior of the four way pilot valve 12 through aperture 17 and the junction of eccentric ring 14 and housing 13.
  • a specific eccentric ring 20 is arranged so that the ring 20 is rotatably fitted to the periphery of one end 21a of the electric pulse motor part 21 and the periphery of one end 22a of the four way pilot valve part 22.
  • the eccentric ring 20 can be rotated by applying a slight turning force from outside so that the backlash of thereduction gears consisting of gears 15 and 16 may be adjusted.
  • this eccentric ring 20 is provided with one internal surface 200' which is fitted to the periphery of one end 21a of the electric pulse motor part 21 and another internal surface 20b which is fitted to the periphery of the end 220 of the four way pilot valve part 22, and these two internal surfaces 20a and 20b are formed so as to be eccentric to each other by a preselected amount, e.
  • the properly adjusted electro-hydraulic pulse motor has an excellent performance.
  • the interior of the electro-hydraulic pulse motor is completely shielded from the possibility Of contamination by fine dust or other foreign material.
  • An electro-hydraulic pulse motor comprising:
  • a housing for a hydraulic valve having one end disposed adjacent one end of said motor housing
  • a valve shaft within said valve housing and having a second gear disposed therein, aid gears being disposed to mesh with one another, and
  • a ring having two internal circular surfaces which are mutually eccentric, one of said surfaces being rotatably connected to an external peripheral surface of said end of said motor housing and the other internal surface being rotatably connected to an external peripheral surface of said end of said valve housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Hydraulic Motors (AREA)
  • Servomotors (AREA)
  • Multiple-Way Valves (AREA)
  • Gears, Cams (AREA)

Abstract

This disclosure relates to an improved electro-hydraulic pulse motor wherein an eccentric ring is provided for a joint of the electric pulse motor part and four way pilot valve part so that adjustment of the backlash in the reduction gear between the electric pulse motor part and the four way pilot valve part can be properly carried out from outside, and therefore the electrohydraulic pulse motor can be adjusted so as to have excellent performances without the interior thereof being contaminated with dust and other foreign material.

Description

United States Patent lnaba et al.
. in lll Aug. 14,1973
3,o11,3ss u 12/1961 ELECTRO-HYDRAULIC PULSE MOTOR Inventors: Seiuemon Inaba, Kawasaki; Kohei Ito, Fujisawa; Kanryo S, Kawasaki; Youichi Amemiya, Tokyo, all of Japan Fujitsu Limited, Kawasaki-shi, Kanagawa-ken, Japan Filed: Dec. 13, 1971 Appl. No.: 207,164
Foreign Application Priority Data Assignee:
Japan HAS /1 3196] US. Cl. 74/409, 251/248 Int. Cl. F16h 55/18 Field of Search 251/248; 74/409 References Cited UNITED STATES PATENTS- Moore 74/409 Primary Examiner-Alan Cohan Attorney-Nelson E. Kimmelman 5 Claims, 4 Drawing Figures 1 ELECTRO-HYDRAULIC PULSE Moron DISCLOSURE OF THE INVENTION The present invention relates to an improvement of an electro-hydraulic pulse motor.
The electro-hydraulic pulse motor has a conventional arrangement in which the principal components 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.
The above-mentioned conventional electrohydraulic pulse motor works on an operational principal such as disclosed below.
A predetermined amount of rotation of the electric pulse motor shaft in response to application 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 way of a 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 above-mentioned screw-nut coupling. The axial shift of the valve spool from the initial neutral position opens an oil supply port provided in the four way pilot valve so as to introduce hydraulic fluid from a fluid power source into the hydraulic circuit for actuating the hydraulic motor. This provides a large torque on the shaft of the hydraulic motor, which serves also as the output shaft of the electro-hydraluic pulse motor. The output is used for driving a machine, for example on the one hand. Also the output rotation of the hydraulic motor restores the valve spool of the four way pilot valve to the neutral position thereof whereupon the hydraulic circuit is blocked again by means of the screw-nut coupling, and one cycle of operation of the electro-hydraluic pulse motor is finished with respect to a pulse applied thereto.
Where the electro-hydraulic pulse motor having the above-mentioned arrangement is used as a control element in a control system, the electro-hydraulic pulse motor is required to have the best possible response characteristics with respect to incoming pulses, such as follow-up characteristics of the pilot valve, accuracy of the rotation of the output shaft thereof,and linearity of the output torque relative to change of the incoming inputs. I
This fact requires that backlash of the abovementioned reduction gear should be adjusted to the optimum, since the backlash of the reduction gear has a large effect, upon the performance.
Accordingly, for the purpose of properly adjusting the backlash, a rotatably fitted eccentric ring has conventionally been arranged in the prior art at the connecting portion between the electric pulse motor and the four way pilot valve so that the adjusting operation The object of the present invention is to provide an improved electro-hydraulic pulse motor eliminating the above-mentioned defects.
The present invention will be described, hereinafter, in more detail with reference to the accompanying drawinGs wherein:
FIG. 1 is a sectional view schematically showing a part of the conventional electro-hydraulic pulse motor;
FIG. 2 is a schematic view taken along line 22 of FIG. 1;
FIG. 3 is an over-all perspective view including a partially cut out portion of an electro-hydraluic pulse motor according to the present invention;
FIG. 4 is a schematical view taken along line 4-4 of FIG. 3.
Referring to FIGS. 1 and 2 which show a conventional backlash-adjusting mechanism, an eccentric ring 14 is rotatably fitted to an electric pulse motor part 11, while the housing 13 of four way pilot valve part 12 is fitted to the periphery of the eccentric ring 14.
The eccentric ring 14 can be rotated by using a suitable tool through aperture 17 formed at a position in housing 13.
A slight rotation of the eccentric ring 14 causes radial displacement between the electric pulse motor part 11 and the four way pilot valve part 12, so that backlash present between gear 15 of the electric pulse motor part 11 and gear 16 of the four way pilot valve part 12 changes. Therefore, a properly adjusted rotation of eccentric ring 14 provides a properly adjusted backlash between the engagement of gears 15 and 16 which act as reduction gears.
As mentioned before, however the presence of the aperture 17 has the defect that fine dust or other foreign material enters the interior of the four way pilot valve 12 through aperture 17 and the junction of eccentric ring 14 and housing 13.
Referring now to FIGS. 3 and 4 which show the present invention, a specific eccentric ring 20 is arranged so that the ring 20 is rotatably fitted to the periphery of one end 21a of the electric pulse motor part 21 and the periphery of one end 22a of the four way pilot valve part 22. a
The eccentric ring 20 can be rotated by applying a slight turning force from outside so that the backlash of thereduction gears consisting of gears 15 and 16 may be adjusted.
As clearly shown in FIG. 4, the inner side of this eccentric ring 20 is provided with one internal surface 200' which is fitted to the periphery of one end 21a of the electric pulse motor part 21 and another internal surface 20b which is fitted to the periphery of the end 220 of the four way pilot valve part 22, and these two internal surfaces 20a and 20b are formed so as to be eccentric to each other by a preselected amount, e.
In accordance with the arrangement of the eccentric ring 20 of the present invention, backlash present between gears 15 and 16 can be properly adjusted by rotating the eccentric ring 20 from outside, since the rotation of the eccentric ring 20 results in a radial displacement between the electric pulse motor part 21 and the four way pilot valve part 22 depending upon the eccentricity e.
Thus, the properly adjusted electro-hydraulic pulse motor has an excellent performance.
Further, in accordance with the present invention, the interior of the electro-hydraulic pulse motor is completely shielded from the possibility Of contamination by fine dust or other foreign material.
What we claim is:
I claim:
1. An electro-hydraulic pulse motor comprising:
a. a housing for said motor,
b. a housing for a hydraulic valve having one end disposed adjacent one end of said motor housing,
c. a motor shaft extending outwardly toward said valve housing from said end of said motor housing and having a first gear disposed thereon,
d. a valve shaft within said valve housing and having a second gear disposed therein, aid gears being disposed to mesh with one another, and
e. a ring having two internal circular surfaces which are mutually eccentric, one of said surfaces being rotatably connected to an external peripheral surface of said end of said motor housing and the other internal surface being rotatably connected to an external peripheral surface of said end of said valve housing.
2. The pulse motor according to claim 1 wherein said peripheral surface of said end of said motor housing has a diameter smaller than that of said peripheral surface of said end of said valve housing.
3. The pulse motor according to claim 1 wherein said ends of said motor and valve housings are contiguous.
4. The pulse motor according to claim 1 wherein said ring is rigid and is free from any apertures transverse to its axis.
5. The pulse motor according to claim 1 wherein said internal surfaces are adjacent one another and have different diameters.

Claims (5)

1. An electro-hydraulic pulse motor comprising: a. a housing for said motor, b. a housing for a hydraulic valve having one end disposed adjacent one end of said motor housing, c. a motor shaft extending outwardly toward Said valve housing from said end of said motor housing and having a first gear disposed thereon, d. a valve shaft within said valve housing and having a second gear disposed therein, aid gears being disposed to mesh with one another, and e. a ring having two internal circular surfaces which are mutually eccentric, one of said surfaces being rotatably connected to an external peripheral surface of said end of said motor housing and the other internal surface being rotatably connected to an external peripheral surface of said end of said valve housing.
2. The pulse motor according to claim 1 wherein said peripheral surface of said end of said motor housing has a diameter smaller than that of said peripheral surface of said end of said valve housing.
3. The pulse motor according to claim 1 wherein said ends of said motor and valve housings are contiguous.
4. The pulse motor according to claim 1 wherein said ring is rigid and is free from any apertures transverse to its axis.
5. The pulse motor according to claim 1 wherein said internal surfaces are adjacent one another and have different diameters.
US00207164A 1970-12-26 1971-12-13 Electro-hydraulic pulse motor Expired - Lifetime US3752001A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970131961U JPS5023754Y1 (en) 1970-12-26 1970-12-26

Publications (1)

Publication Number Publication Date
US3752001A true US3752001A (en) 1973-08-14

Family

ID=15070252

Family Applications (1)

Application Number Title Priority Date Filing Date
US00207164A Expired - Lifetime US3752001A (en) 1970-12-26 1971-12-13 Electro-hydraulic pulse motor

Country Status (5)

Country Link
US (1) US3752001A (en)
JP (1) JPS5023754Y1 (en)
DE (1) DE2163466C3 (en)
FR (1) FR2119726A5 (en)
GB (1) GB1352900A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960671A (en) * 1997-09-30 1999-10-05 Philadelphia Gear Corp. Eccentric pivotable mounting for changing gear reduction ratios

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016213562B4 (en) * 2016-07-25 2019-10-31 Valeo Siemens Eautomotive Germany Gmbh Torque transmitting shaft connection and manufacturing process, as well as powertrain, motor vehicle, program and manufacturing equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960671A (en) * 1997-09-30 1999-10-05 Philadelphia Gear Corp. Eccentric pivotable mounting for changing gear reduction ratios

Also Published As

Publication number Publication date
DE2163466B2 (en) 1977-08-18
DE2163466C3 (en) 1978-04-13
DE2163466A1 (en) 1972-07-06
GB1352900A (en) 1974-05-15
JPS5023754Y1 (en) 1975-07-17
FR2119726A5 (en) 1972-08-04

Similar Documents

Publication Publication Date Title
US4232708A (en) Fluid controller
US4285496A (en) Electro-hydraulic systems
US3185439A (en) Hydraulic motor control system
US4062601A (en) Self-contained modular pivot, notably for robots
DE2463055C2 (en) Control device for controlling the pressure medium supply to a hydraulic drive device via a directional control slide
US2932986A (en) Strain wave gear-species in which only one of the gears is input
US3457836A (en) Digitally operated electrohydraulic power system
US3807456A (en) Hydraulic controller including rotary valve
US3746045A (en) Servo valves
US4343601A (en) Fluid pressure device and shuttle valve assembly therefor
US3138069A (en) Power steering system
US3721266A (en) Rotary pilot valve
US3752001A (en) Electro-hydraulic pulse motor
US3576135A (en) Electromechanical control actuator system
US3099188A (en) Power steering gear
US3393608A (en) Power steering mechanism
US3254674A (en) Rotary servo valve
US4164892A (en) Control apparatus
US3071021A (en) Mechanical power amplifier
US2898890A (en) Motion transmitting device
US4438679A (en) Axial thrust compensating means for power steering control valve
US3905277A (en) Servo-assisted steering mechanism
US3752038A (en) Electro-hydraulic pulse motor
US3695295A (en) Rotary input/feedback mechanical servo valve
US3272082A (en) Hydraulic apparatus