US3194261A - Cross line relief mechanism for reversible hydraulic motor - Google Patents

Cross line relief mechanism for reversible hydraulic motor Download PDF

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Publication number
US3194261A
US3194261A US229601A US22960162A US3194261A US 3194261 A US3194261 A US 3194261A US 229601 A US229601 A US 229601A US 22960162 A US22960162 A US 22960162A US 3194261 A US3194261 A US 3194261A
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US
United States
Prior art keywords
passage
line
fluid
valve
transfer passage
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
US229601A
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English (en)
Inventor
Francis H Tennis
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.)
Koehring Co
Hydraulic Unit Specialties Co
Original Assignee
Hydraulic Unit Specialties Co
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 Hydraulic Unit Specialties Co filed Critical Hydraulic Unit Specialties Co
Priority to US229601A priority Critical patent/US3194261A/en
Priority to BE661340D priority patent/BE661340A/xx
Priority to GB14098/65A priority patent/GB1058786A/en
Priority to FR12905A priority patent/FR1436876A/fr
Application granted granted Critical
Publication of US3194261A publication Critical patent/US3194261A/en
Assigned to KOEHRING COMPANY, A CORP. OF DE reassignment KOEHRING COMPANY, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KOEHRING COMPANY A WI CORP.
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
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type
    • Y10T137/7764—Choked or throttled pressure type
    • Y10T137/7766—Choked passage through main valve head
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7771—Bi-directional flow valves

Definitions

  • This invention relates to hydraulic control instrumentalities and refers more particularly to a cross line relief mechanism for a hydraulic system of the type comprising a reversible hydraulic motor and a control valve by which operation of the motor is governed, which cross line rel lief mechanism provides for transfer of hydraulic fluid from one side of the motor to the other when the control valve is in its hold position and there is a lluid pressure difference across the motor which is in excess of a predetermined high value.
  • a cross line relief mechanism is employed in a hydraulic system wherein a reversible hydraulic motor is connected with a load that tends to exert high inertia forces upon the motor, such as the laterally swinging boom of a large crane, the carriage of a power shovel, or the like.
  • a motor is set in motion by shifting a control valve connected therewith to an operating position at which the valve directs pressure lluid from a source thereof to one side of the motor and at the same time permits return fluid from the other side of the motor to flow back to a reservoir or the like.
  • the control valve When the control valve is shifted back to its neutral or hold position, it cuts olf the motor from both the pressure fluid source and the reservoir, in effect blocking the lines that connect the motor with the control valve.
  • thevmotor tends to push return fluid into one of its lines connected with the control valve an-d to draw a void in the other line.
  • a cross line relief mechanism prevents this unsafe condition by permitting fluid to bleed from one to the other of the lines connected with the motor when the fluid pressure difference between the lines exceeds a predetermined high value.
  • a cross line relief mechanism comprising a body having a pair of ports, each connectable with one side of a reversible hydraulic motor, and having only a single relief valve controlled transfer passage through which pressure fluid can llow in either direction, from either body port to the other.
  • Another object of the present invention is to provide a cross line relief mechanism having a pair of motor ports, a single transfer passage through which fluid can flow in either direction between the motor ports, and a pair of relief valve units, each having poppet mechanism to control communication between one of the motor ports and the transfer passage.
  • a further object of this invention is to provide a cross line relief mechanism of the character described, which affords unusually smooth and effective deceleration of an inertia load.
  • Still another object of this invention is to provide a cross line relief mechanism of the character described which can be embodied in an accessory or attachment that is adapted to be secured to the body of a conventional hydraulic control valve of either the integral type or the so-called stacked or sectional type, to adapt such valve for use with a reversible hydraulic motor that drives a high inertia load.
  • FGURE 1 is a sectional view of a cross line relief mechanism embodying the principles of this invention installed, as an accessory or attachment, upon a hydraulic control valve of the sectional type and connected with a double acting hydraulic cylinder, the cross line relief mechanism being shown in an inoperative condition such as obtains when there is no pressure difference across the cylinder; and
  • FGURE 2 is a fragmentary sectional view on an enlarged scale of the cross line relief mechanism illustrated in FGURE l, shown in its operative condition in which it is relieving a substantially high pressure on the left hand side ofthe cylinder.
  • cross line relief mechanism 5 of this invention is shown as embodied in an attachment for one section of a more or less conventional hydraulic control valve 6 of the sectional or stacked type, which valve is connected with a reversible hydraulic motor such as a double acting hydraulic cylinder 'l'. lt will be understood, however, that the Cross line relief mechanism 5 could Y to the .valve body outlet.
  • valve body k8 isA so formed as to be adapted kfor assembly with' other ⁇ similarV bodies thatare connectable with otherhydraulic motors, and with end sections (not shown)V which provide for connection of the open center passage Slw'ith va pump or the .like and of the return iuid passage means ltlftvith 'a reservoiror the' like.v Y
  • rlfhevalve body 8 hasa bore 13 therein in which a spool or Valve element 14 is slidable in opposite directions froin a neutral "position in which it is shown to either of a pairof operating positions.
  • - 37 is comprised of three ypassage sections, namely a mainV section 137 which extends Vlengthwise between but termi nates short of thej'r'notorport-s,tand 'opposite end secf., tions 237 which connect theendportions ofthe main section V137-/Wit-htl1e.,adjacent motor ports.
  • the spool directs return fluid from the .i
  • the control ⁇ valve is shown as having incorporated :therein anticavitation'means :21,of the'type'disclosed in thecopending application ⁇ oFrancis TenhisgfSerial No. 191,163, tiled April 30, 1962, com-y prising a shortpassageZZ connecting each serviceV passage 18 with, its adjacent leg ⁇ of the return iiuid passage means 1l); Communication through each of the passages 22 is controlled by lfa check valve 23ofi the type that Vmoves in a direction counter to the direction of lloW that it permits; 'Dhu-s if the spool is in one ⁇ of its operating posi-r tions, and if themoto'r, 7 is driven by its load gat arate so rhigh that ,the 'pistoni24 ofthe motor is'evacuating one side of the cylinder 25 ⁇ faster than hydraulic huid can be I v supplied thereto in the vthe normal manner,
  • the crosslinerelief mechanism 5 comprises aV body 30 which is adapt-ed tov be jsuitablyI secu-red to Vthe control valve 6, with one fa'ceilll of the body 30 atwise abutting ⁇ that face 32 Iofthe control valvebody 8. to ⁇ which the;
  • port 36 that isfconnectable with one of the;lines or, ducts 12 leading to the doubleacting cylinder.
  • the .valve unit here shown comprises the subject'ot ⁇ asecond copending appli- 'Y .cation of lrancis-H-Tennisl andDfonald BetthlefSerial .”NO. 202,508,fled June T121, 1962;".
  • each l valve unit comprises an louter:poppetin'enitberv 42 )vhich yisaxially slidable back and forth ina cup-lik'ejcas? 'ing 40 having its rim ⁇ portioh screwgthreaded into a ksuitablytapped holeinthe body openinginto b'ne'end portion of the main section E137 of the transferV passagefatfa loca# non certainty Qppesitegtiie iadjscentvaive restes.
  • the cylindrical side wall 41 of the casing surrounds the outer poppet member d2 with substantial clearance to dene an annular passage 4l around said poppet member.
  • the inner tubular member 52 extends forwardly into a rearwardly opening counterbore 53 in the outer poppet, and cooperates with the latter to define a pressure charnber 45 adjacent to the bottom of the counterbore 53.
  • the front portion of the inner tubular member and the cylindrical skirt 44 on the rear of the outer poppet thus comprise a cylinder and piston, but it will be noted that in this instance the usual relationship is reversed, in that the outer poppet member, which as the movable element can be considered the piston, surrounds the inner tubular member which is fixed and may therefore be considered i the cylinder.
  • a coaxial bore 46 that extends through the front portion of the outer poppet member provides for communicating the pressure chamber 45 with what might be termed the system port provided by the adjacent branch 23S of the transfer passage, Hence pressure of fluid in the chamber 45 is normally the same as that of fluid in the system port and at the motor port with which it communicates via the service passage 33.
  • the valve seat 33 has a somewhat smal-ler diameter than that of pressure chamber 45, and hence the fluid in that chamber tends to maintain the outer poppet member engaged with the seat 38, against the tendency of pressure fluid acting upon the front of the outer poppet member through the seat 3S to move the poppet member off of its seat.
  • the front end portion 43 of the outer poppet member is shown reduced to a diameter less than the inside diameter of its skirt 44, so as to define a forwardly facing annular surface 49 which -is spaced behind its seat engaging surface, and upon which pressure of fluid in the main section 137 of the transfer passage is manifested.
  • F[he effective area of the surface 49, of course, is somewhat greater than the c-ross sectional area of the skirt i4 on the rear of the outer poppet member.
  • each valve unit also includes an inner or pilot poppet 50 which is adapted to open in response to substantially high pressure in the associated line passage 33 or system port 233, and which, when so opened, effects opening of the passage 238 to the main section lr37 of the transfer passage, in this case by causing unseating of the outer poppet member 42.
  • the seat Si with which the pilot poppet cooperates is formed in the inner tubular member 52 by a portion thereof, spaced behind its front end, that has a reduced inside diameter.
  • the valve element on the pilot poppet that engages this seat comprises an enlarged head 54, the
  • Opening or unseating of the pilot poppet permits iiuid to flow rearwardly out of the pressure chamber 45 through the seat 5l, and through radial bores 5l in the inner tubular member, spaced behind the seat 5l; thence around the rear of the main poppet member and forwardly into the main section 137 of the transfer passage, through the annular passage dl provided by the clearance space between the outer tubular member and the outer poppet member.
  • the iiow restricting plunger el is an elongated tubular member which is freely slidable in the bore 46 in the front of the main poppet member, with a small clearance, so as to move rearwardly in response to the rearward flow of fluid through said bore When the pilot poppet opens.
  • Extending coaxially forwardly from the valve element 5d of the pilot is a conical projection 63 which is adapted to be partway received in the rear end of the tubular plunger 6l when the latter is in its rearmost position, to substantially close the rear of the tubular plunger while allowing restricted liow from passage 33 to the chamber d5 through the clearance space between the plunger 6l and the bore le in the front of the outer poppet.
  • the tubular plunger 6l When the pilot poppet is closed the tubular plunger 6l remains in a forward position in which a circumferential flange 64 thereon near its rear end engages the bottom d5 of the counterbore in the outer poppet member. T he plunger 61 is lightly biased to this normal forward position, in which its rear end is spaced from the projection 63 on the pilot poppet, by means of a small coiled compression spring 68 which reacts between the flange 6don the plunger 6l and the inner tubular member 52.
  • this inf vention provides a Cross, ⁇ linelrelief mechanism forfa re- ;versible hydraulic motora/herein a singletransfer. passage wherein flow' of u'id through said transfer passage. is con- Y combination of: Y i Y v (A) a bodyhaving a pair offline-passages adapted for Y trolledby'a pair Vof combinedhigh pressurefrelief andvoid control valves which 4assure stable, chatterffreeoperation of thecross line Vrelief mechanism and provide for'smoothl deceleration of; the
  • a hydraulic control instrumentality 'vofftlzneytype'-Y comprisinga -bodyhaving' a .pair of linepassageseach coni Y, nectable withone side :of 'fa reversiblehydraulic;motor,V .cross line relief means'k for transferringhydraulicpressure. fluid from either line passage in which'an abnormally high pressure developstoi-the otherrlineipassage,v comprising: e
  • A. hydrauliccontrol ⁇ instrumentality comprising the connection with the Opposite sides yof: a reversible uid motor; Y f Y therewith; I (C) f annular valve seats sages;
  • the cross line relielE mechanisms 6 l v of Vthis invention may be employed ina hydraulic circuit apart frornthe control valve thereof, in whichV case the X .'(E) meansrnountingthevalve Ameclia'nisirisinthebordy at locationswholly;outsidethe linexpassag'es andgop-I to the pressure. ofsaid relief iuid'inthetransfer, pas-l:
  • each of the valve mechanisms comprises a high pressure relief valve as Well as a reverse acting check valve, 10 WILLIAM F O DEA Prmmry Exammer' so as to enable pressure fluid from either line passage in M. CARY NELSON, Examiner.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Safety Valves (AREA)
  • Details Of Valves (AREA)
US229601A 1962-10-10 1962-10-10 Cross line relief mechanism for reversible hydraulic motor Expired - Lifetime US3194261A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US229601A US3194261A (en) 1962-10-10 1962-10-10 Cross line relief mechanism for reversible hydraulic motor
BE661340D BE661340A (en:Method) 1962-10-10 1965-03-19
GB14098/65A GB1058786A (en) 1962-10-10 1965-04-02 Improvements in or relating to hydraulic control valve instrumentalities
FR12905A FR1436876A (fr) 1962-10-10 1965-04-12 Mécanisme de décompression à canaux croisés pour un moteur hydraulique réversible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US229601A US3194261A (en) 1962-10-10 1962-10-10 Cross line relief mechanism for reversible hydraulic motor

Publications (1)

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US3194261A true US3194261A (en) 1965-07-13

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Application Number Title Priority Date Filing Date
US229601A Expired - Lifetime US3194261A (en) 1962-10-10 1962-10-10 Cross line relief mechanism for reversible hydraulic motor

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US (1) US3194261A (en:Method)
BE (1) BE661340A (en:Method)
GB (1) GB1058786A (en:Method)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273468A (en) * 1965-01-26 1966-09-20 Fawick Corp Hydraulic system with regenerative position
US3398649A (en) * 1966-11-16 1968-08-27 Borg Warner Hydraulic control system
US3730220A (en) * 1970-04-24 1973-05-01 Dowty Technical Dev Ltd Selector valves
US4487106A (en) * 1983-11-04 1984-12-11 Towmotor Corporation Fluid operated system
US4597410A (en) * 1985-08-30 1986-07-01 Husco International Cross line relief valve mechanism
EP0359354A1 (en) * 1988-08-29 1990-03-21 Pneumo Abex Corporation Fluid control valve with variable pressure gain
US20060213562A1 (en) * 2005-03-28 2006-09-28 Robert D. Jacobson Cross-over relief valve assembly for use in bi-directional circuit
US20160097462A1 (en) * 2014-10-01 2016-04-07 Nabtesco Corporation Hydraulic valve
US20160098045A1 (en) * 2014-10-01 2016-04-07 Nabtesco Corporation Aircraft hydraulic valve
US20190195384A1 (en) * 2017-12-25 2019-06-27 Nabtesco Corporation Fluid valve and opening motion promoting device
CN109990066A (zh) * 2019-03-04 2019-07-09 江苏沃得农业机械有限公司 一种收割机的转向刹车阀

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2954011A (en) * 1959-06-25 1960-09-27 Cessna Aircraft Co Pressure fluid control system and valve
US2989072A (en) * 1959-04-24 1961-06-20 Fawick Corp Relief valve for high pressures

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989072A (en) * 1959-04-24 1961-06-20 Fawick Corp Relief valve for high pressures
US2954011A (en) * 1959-06-25 1960-09-27 Cessna Aircraft Co Pressure fluid control system and valve

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273468A (en) * 1965-01-26 1966-09-20 Fawick Corp Hydraulic system with regenerative position
US3398649A (en) * 1966-11-16 1968-08-27 Borg Warner Hydraulic control system
US3730220A (en) * 1970-04-24 1973-05-01 Dowty Technical Dev Ltd Selector valves
US4487106A (en) * 1983-11-04 1984-12-11 Towmotor Corporation Fluid operated system
WO1985001995A1 (en) * 1983-11-04 1985-05-09 Towmotor Corporation Fluid operated system
GB2159582A (en) * 1983-11-04 1985-12-04 Towmotor Corp Fluid operated system
GB2180080B (en) * 1985-08-30 1989-08-09 Husco Int Inc Cross line relief valve mechanism
GB2180080A (en) * 1985-08-30 1987-03-18 Husco Int Inc Cross line relief valve mechanism
US4597410A (en) * 1985-08-30 1986-07-01 Husco International Cross line relief valve mechanism
EP0359354A1 (en) * 1988-08-29 1990-03-21 Pneumo Abex Corporation Fluid control valve with variable pressure gain
US20060213562A1 (en) * 2005-03-28 2006-09-28 Robert D. Jacobson Cross-over relief valve assembly for use in bi-directional circuit
US7234487B2 (en) 2005-03-28 2007-06-26 Eaton Corporation Cross-over relief valve assembly for use in bi-directional circuit
US20160097462A1 (en) * 2014-10-01 2016-04-07 Nabtesco Corporation Hydraulic valve
US20160098045A1 (en) * 2014-10-01 2016-04-07 Nabtesco Corporation Aircraft hydraulic valve
US10059434B2 (en) * 2014-10-01 2018-08-28 Nabtesco Corporation Aircraft hydraulic valve
US10088066B2 (en) * 2014-10-01 2018-10-02 Nabtesco Corporation Hydraulic valve
US20190195384A1 (en) * 2017-12-25 2019-06-27 Nabtesco Corporation Fluid valve and opening motion promoting device
US10995877B2 (en) * 2017-12-25 2021-05-04 Nabtesco Corporation Fluid valve and opening motion promoting device
CN109990066A (zh) * 2019-03-04 2019-07-09 江苏沃得农业机械有限公司 一种收割机的转向刹车阀

Also Published As

Publication number Publication date
GB1058786A (en) 1967-02-15
BE661340A (en:Method) 1965-09-20

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Owner name: KOEHRING COMPANY 200 EXECUTIVE DRIVE, BROOFIELD, W

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOEHRING COMPANY A WI CORP.;REEL/FRAME:003995/0514

Effective date: 19810505