US3765454A - Pressure graduated control valve - Google Patents

Pressure graduated control valve Download PDF

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Publication number
US3765454A
US3765454A US00328760A US3765454DA US3765454A US 3765454 A US3765454 A US 3765454A US 00328760 A US00328760 A US 00328760A US 3765454D A US3765454D A US 3765454DA US 3765454 A US3765454 A US 3765454A
Authority
US
United States
Prior art keywords
bore
spool
slot
communication
port
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
US00328760A
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English (en)
Inventor
D Carl
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.)
Fiat Allis Europe SpA
Allis Chalmers Corp
Original Assignee
Allis Chalmers Corp
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 Allis Chalmers Corp filed Critical Allis Chalmers Corp
Application granted granted Critical
Publication of US3765454A publication Critical patent/US3765454A/en
Assigned to FIATALLIS EUROPE S.P.A. reassignment FIATALLIS EUROPE S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FIATALLIS NORTH AMERICA, INC., A DE CORP
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
    • B62D11/02—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides
    • B62D11/06—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source
    • B62D11/10—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears
    • B62D11/14—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source
    • B62D11/18—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source the additional power supply being supplied hydraulically
    • 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
    • Y10T137/86702—With internal flow passage
    • 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
    • Y10T137/8671—With annular passage [e.g., spool]
    • 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
    • Y10T137/86718—Dividing into parallel flow paths with recombining
    • Y10T137/86734—With metering feature

Definitions

  • valve spool of a control valve having inlet, service and exhaust ports spaced axially along the valve spool bore.
  • the axial slot always communicates with the service port and extends axially a sufficient distance to permit communication between all three ports as the valve spool is moved from its closed position to its open position. In the closed position one end of the slot is blocked and the other opens-into the exhaust port. In the open position said one end of the slot is open to the inlet port and the other end of the slot is blocked from communication with the exhaust port.
  • the valve provides rapid pressure rises in the service port during initial and final movements of the spool from its closed position to its open position.
  • variable flow modulated valve shown in US. Pat. No. 3,556,]55.
  • An axial slot is formed in the spool of a control valve so as to extend, in the closed position ofthe spool, from a position adjacent an inlet port across a service port and into an exhaust port.
  • the opposite axial ends of the slot are enlarged in width by drilling holes in the spool of a diameter greater than the width of the slot.
  • the drilled opening at the inlet end of the slot is blocked by a land of a bore in which the valve spool reciprocates when the latter is in its closed position.
  • FIG. 1 is a section view showing a pair of steering control valves for a crawler tractor in their closed position
  • FIG. 2 shows one of the steering control valve spools shifted slightly toward an open position
  • FIG. 3 is a section taken along the line III-III in FIG. 2;
  • FIG. 4 is a view similar to that of FIG. 2 but showing the spool moved to a full open position
  • FIG. 5 is a pressure versus spool displacement graph.
  • a pair of steering clutches 11, 12 in the final drive housing 13 of a crawler tractor are controlled by a hydraulic control system including a valve assembly 16.
  • the valve assembly 16 includes a valve body 17 having a pair of bores 18, 19 in which a pair of valve spools 2.1, 22 are mounted for axial reciprocation between open and closed positions.
  • a pump 23 draws fluid from final drive housing 13, which serves as a reservoir, by way ofline 24 and delivers fluid under pressure via line-25 to an inlet passage 27 which is connected to inlet ports 28, 29 formed in the body 17.
  • a pair of service ports 31, 32 are formed in the body in intersecting relation to the bores l8, l9 and are in axially spaced relation to the inlet ports 28, 29.
  • the ser vice ports 31, 32 are connected to the clutches 11, 12 through appropriate conduits shown schematically by lines 33, 34.
  • a pair of exhaust ports 36, 37, spaced axially of the service ports 31, 32, are connected to one another by an internal passage 38 and are connected by an internal passage 39 to an outlet 41 in the body 17 which in turn is connected to the final drive housing 13 by an exhaust conduit 42.
  • Conventional biasing means 51, 52 are provided on the right ends of the valves 21, 22 to bias the valve spools 21, 22 to their illustrated closed positions.
  • the valve assembly 16 also includes an unloading valve 56 and a high pressure relief valve 57.
  • a pair of diametrically opposite and axially extending slots 71, 72 are formed in the spool 21, as by milling, so as to be of sufficient axial dimension to bridge the distance between inlet port 28 and exhaust port 36 during movement of the spool 21 from its closed position to its open position.
  • a pair of drilled openings 73, 74 extend radially in relation to the spool 21 and refect its axis 75. The diameters of the openings 73, 74 are greater than the width x of the slots 71, 72.
  • the slots 71, 72 have indentical widths.
  • annular recess 81 is provided in the spool 21 in spaced relation to the inlet and outlet openings 73, 74.
  • the annular recess 81 is in direct communication with service port 31 in all positions of the spool 21, but does not open into either the inlet port 28 or the exhaust port 36 in any operating position of the spool 21.
  • the recess 81 communicates with the openings 73, 74 only through the slots 71, 72.
  • the present invention provides a valve spool having an axial slot which is always in fluid communication with the service port.
  • the slot also communicates with the exhaust port in the closed position of the valve spool and with the inlet port in the spools open position.
  • the slots inlet and outlet ends that is the axially opposite ends, are enlarged to provide a more rapid pressure rise, in relation to valve spool movement, during initial and final movements of the spool from closed to open positions.
  • the inlet, service and exhaust ports arespaced axially of one another along the spool bore and communicate with the bore.
  • the inlet and service ports 28, 31 are separated by the bore land 76 and the service and exhaust ports 31 and 36 are separated by the bore land 77.
  • the bore land 76 cooperates with spool land 82 to prevent fluid flow from the inlet port 28 to the service port 31 in the closed position of the spool 31 as illustrated in FIG. 1.
  • the bore land 77 cooperates with spool land 83 to prevent flow from the service port 31 to exhaust port 36 when the spool 21 is in its closed position as shown in FIG. 4.
  • the slots 71, 72 and enlarged peripheral openings 73, 74 at their axially opposite ends provide a generally gradual pressure rise in the service port 31 as the spool 21 is moved from its closed to open position with the pressure rise being relatively rapid in the initial and final movement of the spool from closed to open positions.
  • This invention provides an excellent pressure versus displacement relationship for crawler tractor hydraulic steering clutch control.
  • a control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction from said inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by:
  • a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having an axially extending slot in its periphery in communication with said service port, and
  • first and second enlarged peripheral openings in said slot at its opposite axial ends respectively, said first opening being blocked by said first bore land and said second opening being in full free flow communication with said exhaust port when said spool is in its closed position, said first opening being in full free flow communication with said inlet port and said second opening being blocked by said second bore land when said spool is in its open position.
  • valve of claim 1 and further characterized by an annular recess in said spool between and spaced axially from said openings.
  • valve of claim 5 and further characterized by another slot on the diametrically opposite side of said spool'from said first mentioned slot and extending axially between and in free flow communication with said openings.
  • a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having, an axially extending slot in its periphery in communication with said service port, said slot being blocked from communication with said inlet port by said first bore land and said slot being in full free flow communication with said exhaust port when said spool is in its closed position, said slot being in full free flow communication with said inlet port and said slot being blocked from communication with said exhaust port by said second bore land when said spool is in its open position, said slot being in fluid communication with all said ports during a major part of the movement of said spool from said closed position to said open position.
  • valve of claim 7 and further characterized by an annular recess in said spool intermediate the axially other-slot is enlarged at its axial end nearest said exopposite ends of said slot.
  • a control valve of the type having a body with a bore, an inlet port communicating with said bore, a service port communicating with said bore and spaced in one axial direction fromsaid inlet port by a first bore land and an exhaust port communicating with said bore and spaced in said one axial direction from said service port by a second bore land, characterized by:
  • a spool reciprocatively mounted in said bore for axial movement between closed and open positions and having a pair of axially extending slots in its periphery in communication with said service port, said slots being blocked from communication with said inlet port by said first bore land and one of said slots being in communication with said exhaust port when said spool is in its closed position, the other of said slots being in communication with said inlet port and one slot being blocked from communication with said exhaust port by said second bore land when said spool is in its open position.
  • valve of claim 11 and further comprising an annular recess formed in said spool between said axial ends of said slots and wherein said slots open into said recess, said recess being in direct communication with said service port in all positions of said spool and said recess having communication with said inlet and outlet ports in the open and closed positions of said spool, respectively, by way of said one and other slots, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Multiple-Way Valves (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Safety Valves (AREA)
US00328760A 1973-02-01 1973-02-01 Pressure graduated control valve Expired - Lifetime US3765454A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32876073A 1973-02-01 1973-02-01

Publications (1)

Publication Number Publication Date
US3765454A true US3765454A (en) 1973-10-16

Family

ID=23282322

Family Applications (1)

Application Number Title Priority Date Filing Date
US00328760A Expired - Lifetime US3765454A (en) 1973-02-01 1973-02-01 Pressure graduated control valve

Country Status (9)

Country Link
US (1) US3765454A (ja)
JP (1) JPS49106028A (ja)
BR (1) BR7400746D0 (ja)
CA (1) CA991951A (ja)
DE (1) DE2403430A1 (ja)
ES (1) ES422788A1 (ja)
FR (1) FR2216495B1 (ja)
IT (1) IT1004305B (ja)
SE (1) SE403398B (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122867A (en) * 1975-01-06 1978-10-31 International Harvester Company Hydraulic valve with open center metering notches
US4188839A (en) * 1978-02-17 1980-02-19 Toyota Jidosha Kogyo Kabushiki Kaisha Throttling control valve and a system for controlling downshift timing of an automatic transmission for vehicles
WO1980001940A1 (en) * 1979-03-05 1980-09-18 Mcwilliams O Balanced spool valve
US4230152A (en) * 1978-01-16 1980-10-28 Fiat-Allis Construction Machinery, Inc. Multi-function control valve
US4559815A (en) * 1983-02-08 1985-12-24 Tectron (Eng) Ltd. Testing device for fuel injectors
US4676351A (en) * 1986-01-09 1987-06-30 Fiatallis Europe, S.P.A. Hydraulic operated control system to apply vehicle brakes
CN104047972A (zh) * 2014-06-19 2014-09-17 第一拖拉机股份有限公司 轮式拖拉机压力控制阀

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604108A1 (de) * 1975-02-04 1976-08-05 Caterpillar Tractor Co Drosselschlitz fuer einen ventilkolben
HU180152B (en) * 1980-07-03 1983-02-28 Danuvia Koezponti Szeszam Es K Hidraulic apparatus for controlling energy flow

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971536A (en) * 1958-06-26 1961-02-14 Caterpillar Tractor Co Hydraulic control valve throttling mechanism
US2986165A (en) * 1956-01-23 1961-05-30 Cleveland Pneumatic Ind Inc Balanced slide valve
US3004555A (en) * 1957-02-19 1961-10-17 Borg Warner Valves
US3176722A (en) * 1962-08-06 1965-04-06 Borg Warner Hydraulic valve device
US3370611A (en) * 1964-11-21 1968-02-27 Dowty Hydraulic Units Ltd Slide valves

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1120230B (de) * 1958-05-16 1961-12-21 Karl Marx Stadt Maschf Steuerschieber mit drehbarem Kolben zur Feinregulierung insbesondere der Bewegung von Arbeitskolben
US3148703A (en) * 1961-12-15 1964-09-15 Robertshaw Controls Co Rotary pneumatic pressure divider
US3507303A (en) * 1967-07-24 1970-04-21 Sanders Associates Inc Linear pressure differential valve
US3556155A (en) * 1969-01-24 1971-01-19 Caterpillar Tractor Co Variable flow-modulated valve
BE759150A (fr) * 1969-11-19 1971-04-30 Fujitsu Ltd Soupape pilote rotative

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986165A (en) * 1956-01-23 1961-05-30 Cleveland Pneumatic Ind Inc Balanced slide valve
US3004555A (en) * 1957-02-19 1961-10-17 Borg Warner Valves
US2971536A (en) * 1958-06-26 1961-02-14 Caterpillar Tractor Co Hydraulic control valve throttling mechanism
US3176722A (en) * 1962-08-06 1965-04-06 Borg Warner Hydraulic valve device
US3370611A (en) * 1964-11-21 1968-02-27 Dowty Hydraulic Units Ltd Slide valves

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122867A (en) * 1975-01-06 1978-10-31 International Harvester Company Hydraulic valve with open center metering notches
US4230152A (en) * 1978-01-16 1980-10-28 Fiat-Allis Construction Machinery, Inc. Multi-function control valve
US4188839A (en) * 1978-02-17 1980-02-19 Toyota Jidosha Kogyo Kabushiki Kaisha Throttling control valve and a system for controlling downshift timing of an automatic transmission for vehicles
WO1980001940A1 (en) * 1979-03-05 1980-09-18 Mcwilliams O Balanced spool valve
US4559815A (en) * 1983-02-08 1985-12-24 Tectron (Eng) Ltd. Testing device for fuel injectors
US4676351A (en) * 1986-01-09 1987-06-30 Fiatallis Europe, S.P.A. Hydraulic operated control system to apply vehicle brakes
CN104047972A (zh) * 2014-06-19 2014-09-17 第一拖拉机股份有限公司 轮式拖拉机压力控制阀

Also Published As

Publication number Publication date
DE2403430A1 (de) 1974-08-08
FR2216495A1 (ja) 1974-08-30
BR7400746D0 (pt) 1974-10-29
SE403398B (sv) 1978-08-14
IT1004305B (it) 1976-07-10
CA991951A (en) 1976-06-29
JPS49106028A (ja) 1974-10-08
ES422788A1 (es) 1976-05-01
FR2216495B1 (ja) 1979-10-19

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FIATALLIS EUROPE S.P.A., ZONA INDUSTRIALE SURBO, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FIATALLIS NORTH AMERICA, INC., A DE CORP;REEL/FRAME:004389/0443

Effective date: 19850228