US3669147A - Power transmission - Google Patents

Power transmission Download PDF

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Publication number
US3669147A
US3669147A US116375A US3669147DA US3669147A US 3669147 A US3669147 A US 3669147A US 116375 A US116375 A US 116375A US 3669147D A US3669147D A US 3669147DA US 3669147 A US3669147 A US 3669147A
Authority
US
United States
Prior art keywords
valve
spool
pilot valve
main
pilot
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
US116375A
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English (en)
Inventor
Robert G Farrell
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.)
Vickers Inc
Original Assignee
Sperry Rand 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 Sperry Rand Corp filed Critical Sperry Rand Corp
Application granted granted Critical
Publication of US3669147A publication Critical patent/US3669147A/en
Assigned to SPERRY CORPORATION reassignment SPERRY CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SPERRY RAND CORPORATION
Assigned to VICKERS, INCORPORATED reassignment VICKERS, INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SPERRY CORPORATION A DE 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/004—Fluid pressure supply failure
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0435—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being sliding valves
    • 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
    • Y10T137/86582—Pilot-actuated

Definitions

  • ABSTRACT [52] US. Cl ..l37/625.6, 91/6, 91/416, A power assisted directional comm] valve f hydraulic power 91/417 systems has a sliding spool actuated by a differential piston. A 5 l Int. Cl ..F 15b 15/17 follow up valve is telescoped within the Spool and controls the [58] Field Of Search ..-.137/625.63, 625.6, 625.64, admission and release of pilot pressure fl to and from the 137/6252; 91/417 6 large side of the actuating piston.
  • a remotely controlled directional valve comprising a main body, a main spool slidable in the body, porting in the body and grooving on the spool to direct fluid flow forwardly and reversely and to terminate flow to and from a work device, a centering spring for the main spool, means forming an actuating piston for the main spool and having large and small effective areas on its opposing faces, a follow-up pilot valve for ad mitting and releasing pressure fluid to and from the large side of the actuating piston, and an auxiliary pilot valve normally inoperative and responsive to overtravel of the follow-up pilot valve for admitting pressure fluid trapped by the main valve to the actuating piston in the event of failure of the main spool to shift when the follow-up pilot valve is shifted.
  • FIG. 1 is a longitudinal sectional view of a valve incorporating a preferred form of the present invention.
  • FIG. 2 is an enlarged fragmentary view of a portion of FIG. 1.
  • the main valve comprises a body and a sliding spool 12 which may be of any convenient form for controlling hydraulic power between a pressure supply and a work device.
  • Such valves may have a plurality of ports such as l4, l5, l7 and 19 in the body and of grooves such as 16 and 21 in the spool.
  • the ports 14 and 19 may communicate with the tank return passages in the hydraulic power system and the ports 15 and 17 communicate with the reversible motor passageways in the valve.
  • the valve will usually also contain other ports and grooves, not illustrated, but which are well known in the art.
  • the spool 12 is provided with a differential actuating piston 20, the left side of which has an effective area substantially pilot housing 22 is attached to the right end of the body 10 by suitable bolts and has a cylindrical bore 26 within which the piston 20 reciprocates. Sliding seals at 28 and 30 are provided for the spool 12 and the piston 20 respectively.
  • the main spool 12 has a pilot valve bore 32 which communicates near its left end through radial bores 34 with the tank return port 14 of the :main body 10. Near its right-hand end, the bore 32 communicates by passages 36 with the space at the small area side of the piston 20 which is constantly exposed to pilot fluid pressure, as will later be described.
  • a pilot valve spool 38 Slidable in the bore 32 is a pilot valve spool 38 having lands 40 and 42 which, in the neutral position illustrated, just close off the radial passages 34 and 36.
  • the spool 38 has an internal passage 44 which connects its left end face with the space at the right of the differential piston 20.
  • a pin 46 is pressed in the spool 38 and cooperates: with a groove 48 in the main spool 12 to limit the motion of the pilot valve relative to the main spool.
  • the lands 40 and 42 control the admission and exhaust of pilot pressure fluid to and from the large area side of piston 20, causing the spool 12 to follow-up the displacements of the stem 38.
  • the pilot valve spool 38 has a groove 50 which receives a rotary actuator comprising a lever 52 secured to a rotary shaft 54.
  • the shaft 54 projects through the wall of the pilot body 22 and may be connected to any desired operating mechanism, such as an external operating lever, to be moved by a suitable linkage connecting with the operators handle.
  • the top of the pilot body 22 is closed by a cap member 60 having a fluid terminal 64 for connection to a suitable source of pilot pressure fluid. Passages 66 in the cap 60 and the pilot body 22 supply such pressure fluid to the bore 26 at the left side of the differential piston 20 and also through radial passages 36 to the pilot valve itself.
  • the cap 60 also contains a detent plunger 70 connected to the lever 52 and a spring centering mechanism 82.
  • a detent release solenoid is indicated at 62.
  • the main spool 12 also contains a bore 84 coaxial with the pilot valve bore 32 and having an extension 86 which communicates by a radial port 88 with the groove 21 on the main spool.
  • a pin 90 Secured within the bore 84 by a pin 90 is an auxiliary pilot valve body 92 having a central bore 94 which slidably receives an auxiliary pilot spool 96.
  • the body 92 has ports 98 which are normally closed by the auxiliary pilot spool.
  • a spring 100 urges the pilot spool to its right-hand position against the retaining ring 102, as illustrated in HQ 2.
  • a washer 104 abuts a shoulder in the bore 94 of the body 92 and serves as a check valve opening to flow from the ports 98 toward the right-hand end of the auxiliary pilot valve.
  • a pin 106 at the right-hand end of the auxiliary pilot spool 96 serves as an abutment through which the main pilot spool 38 may shift the auxiliary pilot spool to the left upon overtravel of the main pilot spool.
  • the main spool 12 is normally shifted by pilot fluid pressure acting on the differential piston 20 and under control of the follow-up pilot valve 38. In the event, however, that there is a loss of pilot pressure due either to engine failure or breakages of the pilot supply line, it then becomes impossible to shift the main spool away from its spring centered position by the action of the pilot valve 38 alone. If the load device, such as a filled loader bucket, should be in an elevated position upon such an occurrence, the weight of the bucket will create a fluid pressure within the motor port 17 because the fluid in this port is trapped by the groove 21. When the operator shifts the control handle to lower the bucket, this shifts the follow up pilot spool 38, opening the large side of piston 20 to pilot pressure through passages 36.
  • the main spool 12 Since there is no pilot pressure, the main spool will not move. However, upon further travel of the main pilot valve 38, the auxiliary pilot valve is shifted to the left by contact with the operating pin 106. This opens the ports 98 and allows the trapped fluid pressure to pass through the check valve washer 104 and through the hollow interior 44 of the follow-up pilot valve to both sides of the actuating piston 20. Thus, the main spool 12 will be shifted to the left, opening the port 17 to the tank port 19 and allowing the loaded bucket to descend.
  • a remotely controlled directional valve comprising a main body, a main spool slidable in the body, porting in the body and grooving on the spool to direct fluid flow forwardly and reversely and to terminate flow to and from a work device, a centering spring for the main spool, means forming an actuating piston for the main spool and having large and small effective areas on its opposing faces, a follow-up pilot valve for admitting and releasing pressure fluid to and from the large side of the actuating piston, and an auxiliary pilot valve normally inoperative and responsive to overtravel of the follow-up pilot valve for admitting pressure fluid trapped by the main valve to the actuating piston, in the event of failure of the main spool to shift when the follow-up pilot valve is shifted.
  • auxiliary pilot valve includes a check valve opening to flow toward the actuating piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Servomotors (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)
  • Multiple-Way Valves (AREA)
  • Actuator (AREA)
US116375A 1971-02-18 1971-02-18 Power transmission Expired - Lifetime US3669147A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11637571A 1971-02-18 1971-02-18

Publications (1)

Publication Number Publication Date
US3669147A true US3669147A (en) 1972-06-13

Family

ID=22366803

Family Applications (1)

Application Number Title Priority Date Filing Date
US116375A Expired - Lifetime US3669147A (en) 1971-02-18 1971-02-18 Power transmission

Country Status (9)

Country Link
US (1) US3669147A (it)
JP (1) JPS5224703B1 (it)
AU (1) AU460376B2 (it)
CA (1) CA945868A (it)
DE (1) DE2202625C3 (it)
FR (1) FR2125572B1 (it)
GB (1) GB1328750A (it)
IT (1) IT945609B (it)
SE (1) SE362933B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296649A (en) * 1979-04-04 1981-10-27 Deere & Company Hydraulically operated transmission control
WO1997013074A3 (de) * 1995-09-30 1997-05-01 Eckehart Schulze Elektrohydraulische steuerventilanordnung
US11814822B2 (en) 2018-09-27 2023-11-14 Aalberts Integrated Piping Systems Limited Plumbing fitting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638489A (en) * 1899-06-15 1899-12-05 Chester B Albree Motor for tools.
US2363111A (en) * 1941-12-02 1944-11-21 Vinco Corp Hydraulic valve
US2685794A (en) * 1951-01-08 1954-08-10 Northrop Aircraft Inc Load maintainer
US2906246A (en) * 1953-06-18 1959-09-29 Ross Operating Valve Co Control system for fluid actuated devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1357067A (fr) * 1963-02-20 1964-04-03 Dispositif pour la commande automatique d'organes de transfert de liquides
US3515032A (en) * 1968-10-31 1970-06-02 Caterpillar Tractor Co Pilot bleed system for remote control valve operation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US638489A (en) * 1899-06-15 1899-12-05 Chester B Albree Motor for tools.
US2363111A (en) * 1941-12-02 1944-11-21 Vinco Corp Hydraulic valve
US2685794A (en) * 1951-01-08 1954-08-10 Northrop Aircraft Inc Load maintainer
US2906246A (en) * 1953-06-18 1959-09-29 Ross Operating Valve Co Control system for fluid actuated devices

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296649A (en) * 1979-04-04 1981-10-27 Deere & Company Hydraulically operated transmission control
WO1997013074A3 (de) * 1995-09-30 1997-05-01 Eckehart Schulze Elektrohydraulische steuerventilanordnung
US11814822B2 (en) 2018-09-27 2023-11-14 Aalberts Integrated Piping Systems Limited Plumbing fitting

Also Published As

Publication number Publication date
DE2202625A1 (de) 1972-08-24
GB1328750A (en) 1973-08-30
FR2125572A1 (it) 1972-09-29
SE362933B (it) 1973-12-27
CA945868A (en) 1974-04-23
AU3698071A (en) 1973-06-21
JPS5224703B1 (it) 1977-07-02
IT945609B (it) 1973-05-10
DE2202625C3 (de) 1979-02-01
FR2125572B1 (it) 1975-10-24
AU460376B2 (en) 1975-04-24
DE2202625B2 (de) 1978-06-08

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SPERRY CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:SPERRY RAND CORPORATION;REEL/FRAME:003794/0122

Effective date: 19790824

AS Assignment

Owner name: VICKERS, INCORPORATED TROY, MI A DE CORP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE NOVEMBER 2, 1983;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102

Owner name: VICKERS, INCORPORATED,MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102