US3516445A - Hydraulic actuating systems - Google Patents

Hydraulic actuating systems Download PDF

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Publication number
US3516445A
US3516445A US796345A US3516445DA US3516445A US 3516445 A US3516445 A US 3516445A US 796345 A US796345 A US 796345A US 3516445D A US3516445D A US 3516445DA US 3516445 A US3516445 A US 3516445A
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US
United States
Prior art keywords
valve
spool
port
pressure
service
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
US796345A
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English (en)
Inventor
Ronald E J Skeates
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.)
Sauer Danfoss Swindon Ltd
Original Assignee
GE Healthcare UK 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 GE Healthcare UK Ltd filed Critical GE Healthcare UK Ltd
Application granted granted Critical
Publication of US3516445A publication Critical patent/US3516445A/en
Assigned to SUNDSTRAND HYDRATEC LIMITED, AN ENGLISH COMPANY reassignment SUNDSTRAND HYDRATEC LIMITED, AN ENGLISH COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLESSEY COMPANY PLC, THE AN ENGLISH COMPANY
Assigned to PLESSEY COMPANY PLC THE reassignment PLESSEY COMPANY PLC THE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE SEPT. 23, 1981. Assignors: PLESSEY COMPANY LIMITED THE
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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/5762—With leakage or drip collecting
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y10T137/86694—Piston valve

Definitions

  • a hydraulic actuating arrangement in which a spool valve comprises a spool slidable in a bore in the body of the actuator, the spool being provided with a peripheral groove which, at least in the neutral position of the spool is trained so that leakage between the spool and said bore is intercepted by said groove and prevented from reaching the associated actuator (not shown).
  • a spool valve comprises a spool slidable in a bore in the body of the actuator, the spool being provided with a peripheral groove which, at least in the neutral position of the spool is trained so that leakage between the spool and said bore is intercepted by said groove and prevented from reaching the associated actuator (not shown).
  • Such an arrangement may be conveniently used in digger or loading equipment to prevent creepage of the associated actuator members.
  • This invention relates to hydraulic actuating systems of the kind in which a single positive-displacement hydraulic power source is made available for the selective utilisation in a number of hydraulic services, each having a separate spool valve by inter-connecting these spool valves by a transfer passage which passes from a pressure inlet in series through a port of each spool valve which is open when the valve spool is in an inoperative position, to reach a lowpressure return port, so that when each spool valve is in its inoperative position, the pressure source is unloaded via the transfer passage, while the transfer passage is closed to cause a pressure build-up when any spool is moved to an operative position, each spool valve having a pressure port communicating with the said pressure inlet via a nonreturn valve, one or more service ports, and one or more return ports communicating with a point at low pressure, the high-pressure, service, and low pressure ports of each valve being isolated by lands of the valve spool when the latter is in its inoperative position.
  • the valve spool of a service to be protected against creepage is provided with a peripheral groove which in the inoperative position of the valve spool faces the land separating the pressure port and the service port of the valve housing for the service controlled by the valve spool in question, this groove being, at least in the inoperative position of the spool, drained to a point at low pressure so that leakage from the pressure port towards the service port of the valve is intercepted by the groove and thus prevented from reaching the service port of the valve.
  • FIG. 1 is a diagrammatic plan view showing part of the hydraulic equipment and including a section of the valve assembly, and
  • FIG. 2 is an elevation, partly in section on line A-A of FIG. 1.
  • hydraulic liquid from a reservoir T is pumped via a positive-displacement pump P to a transfer passage 1, which is sub-divided by lands 6a, 6b and 60, respectively co-operating with valve spools 3a, 3b and 3c, into series-connected portions 1a, 1b, 1c and 1d, the latter being drained to the reservoir T by a return line 4, which also communicates with two low-pressure ports 21 for each spool valve 3a, 3b and 30 respectively arranged at each side of the transfer passage 1.
  • the inlet of the transfer passage 1 further communicates with a pressure gallery 9, see FIG. 2, which is connected to a pair of annular pressure ports 12 for each valve spool via a check valve 10 and branch passage 11.
  • a service port 14 and 24 Arranged at each side of the transfer passage, about half-way between the pressure port 12 and the return port 21 for each valve spool 3, is a service port 14 and 24 respectively, each service port 14 and 24 being faced by an annular port 16 or 26 respectively in the valve spool which, as the valve spool is moved to one or the other side from its illustrated inoperative central position, connects the service port with either the pressure port 12 or the low-pressure port 21 in a well known manner so that displacement of a spool 3 towards the left will connect its right-hand service port 14 to the associated pressure port 12 while venting the left-hand service port 24 to a low-pressure port 21 and vice versa thus causing operation of the associated service in one direction or the other according to the direction in which the valve spool has been displaced.
  • valve spool 3a In order to prevent such creepage in each of the last-mentioned valves along the lands 7 and 8 which, in cooperation with lands 15 and 25 of the valve housing 2 isolates, in the inoperative position of these valves, their pressure ports 12 from their service ports 14 and 24, a circumferential groove 17 is provided in each of the lands 7 and 8 of these valve spools at a point of their length which, when the valve spool is in its inoperative position, faces the land 15 or 25 of the valve housing which separates the pressure port 12 from the service port 14 or 24, and each of these grooves communicates, by radial bores 18 and a longitudinal bore 19 extending along the axis of the spool, with radial bores 20 which when the valve is in this inoperative position, open into one of the low-pressure ports 21,
  • a valve assembly for hydraulic actuating equipment of the kind hereinabove specified wherein the valve spool of a service to be protected against creepage is provided with a peripheral groove which in the inoperative position of the valve spool faces the land separating the pressure port and the service port of the valve housing for the service controlled 'by the valve spool in question, and means for connecting said groove to a point at low pres sure so that leakage from the pressure port towards the service port of the valve is intercepted by the groove and thus prevented from reaching the service port of the valve.
  • valve assembly as claimed in claim 1, wherein said valve spool has an inoperative position and at least one operative position, said means for connecting said groove being so constructed as to be operative only when the valve spool is in said inoperative position.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
US796345A 1968-02-07 1969-02-04 Hydraulic actuating systems Expired - Lifetime US3516445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB602468 1968-02-07

Publications (1)

Publication Number Publication Date
US3516445A true US3516445A (en) 1970-06-23

Family

ID=9807032

Family Applications (1)

Application Number Title Priority Date Filing Date
US796345A Expired - Lifetime US3516445A (en) 1968-02-07 1969-02-04 Hydraulic actuating systems

Country Status (5)

Country Link
US (1) US3516445A (enrdf_load_stackoverflow)
DE (1) DE1905794A1 (enrdf_load_stackoverflow)
FR (1) FR2001478A1 (enrdf_load_stackoverflow)
GB (1) GB1251812A (enrdf_load_stackoverflow)
SE (1) SE335676B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707984A (en) * 1971-09-02 1973-01-02 Caterpillar Tractor Co Hydraulic valve with leakage control
US3973583A (en) * 1973-05-21 1976-08-10 Sorenson Gerald T Fluid control system
US3996958A (en) * 1975-04-04 1976-12-14 Lajoie Enterprises Ltd. Hydraulic valve aspirator
US4566479A (en) * 1983-03-14 1986-01-28 Mannesmann Rexroth Gmbh Spool member of a multi-way-valve
US5218990A (en) * 1990-12-11 1993-06-15 Mannesmann Rexroth Gmbh Multiway valve with piston slide valve

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486087A (en) * 1943-07-29 1949-10-25 Galion Iron Works & Mfg Co Hydraulic valve
US3262467A (en) * 1964-07-27 1966-07-26 Parker Hannifin Corp Spool valve with cavitation-minimizing valve assembly
US3429341A (en) * 1965-05-07 1969-02-25 Hoerbiger Ventilwerke Ag Control slide valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486087A (en) * 1943-07-29 1949-10-25 Galion Iron Works & Mfg Co Hydraulic valve
US3262467A (en) * 1964-07-27 1966-07-26 Parker Hannifin Corp Spool valve with cavitation-minimizing valve assembly
US3429341A (en) * 1965-05-07 1969-02-25 Hoerbiger Ventilwerke Ag Control slide valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707984A (en) * 1971-09-02 1973-01-02 Caterpillar Tractor Co Hydraulic valve with leakage control
US3973583A (en) * 1973-05-21 1976-08-10 Sorenson Gerald T Fluid control system
US3996958A (en) * 1975-04-04 1976-12-14 Lajoie Enterprises Ltd. Hydraulic valve aspirator
US4566479A (en) * 1983-03-14 1986-01-28 Mannesmann Rexroth Gmbh Spool member of a multi-way-valve
US5218990A (en) * 1990-12-11 1993-06-15 Mannesmann Rexroth Gmbh Multiway valve with piston slide valve

Also Published As

Publication number Publication date
DE1905794A1 (de) 1969-09-04
GB1251812A (enrdf_load_stackoverflow) 1971-11-03
SE335676B (enrdf_load_stackoverflow) 1971-06-01
FR2001478A1 (enrdf_load_stackoverflow) 1969-09-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SUNDSTRAND HYDRATEC LIMITED, CHENEY MANOR, SWINDON

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PLESSEY COMPANY PLC, THE AN ENGLISH COMPANY;REEL/FRAME:004236/0447

Effective date: 19831024

Owner name: PLESSEY COMPANY PLC THE

Free format text: CHANGE OF NAME;ASSIGNOR:PLESSEY COMPANY LIMITED THE;REEL/FRAME:004236/0441

Effective date: 19820630