GB1319482A - Hydraulic control system - Google Patents

Hydraulic control system

Info

Publication number
GB1319482A
GB1319482A GB2756270A GB2756270A GB1319482A GB 1319482 A GB1319482 A GB 1319482A GB 2756270 A GB2756270 A GB 2756270A GB 2756270 A GB2756270 A GB 2756270A GB 1319482 A GB1319482 A GB 1319482A
Authority
GB
United Kingdom
Prior art keywords
motor
control
fluid
displaced
motors
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
Application number
GB2756270A
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.)
Cessna Aircraft Co
Original Assignee
Cessna Aircraft 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 Cessna Aircraft Co filed Critical Cessna Aircraft Co
Publication of GB1319482A publication Critical patent/GB1319482A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
    • 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
    • F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
    • 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
    • Y10T137/87169—Supply and exhaust

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

1319482 Shovelling machines CESSNA AIRCRAFT CO 8 June 1970 [30 June 1969] 27562/70 Heading E1F [Also in Division F1] A hydraulic control system is such as to permit of control of the related operation of at least a first and a second hydraulic fluid actuated motor. In a preferred use of the system the motors involved are the boomswing, piston cylinder motor(s) 15 and shovelswinging motor(s) 19 and the system in such use permits of automatic retention of the level of the shovel as the boom is at least swung upwards. The system involves a supply of pressurised fluid, a reservoir and control valve means 23 communicating with the supply, the reservoir and the motors. The control valve means has a control element 31 that is shiftable to a position to both direct pressurised fluid to the first motor to actuate same and to direct hydraulic fluid displaced from the first motor as a result of its actuation to a flow divider 44 associated with the control valve means. The control divider directs a predetermined portion of the displaced fluid to the second motor to actuate same in correlation with actuation of the first motor. When such a system is used as described in a shovelling machine there is no longer need to match the motors so that the total volume displaced by the boom motor(s) is equal to that needed to extend the bucket motor(s) the required extent. Preferably a check valve is located between the flow divider and the second motor to prevent reverse flow from the second motor to the control means. A separate control means 26 is provided for the second motor, which means is such that it can override actuation of the second motor by said predetermined portion of displaced fluid. Three preferred embodiments of the system are described in detail.
GB2756270A 1969-06-30 1970-06-08 Hydraulic control system Expired GB1319482A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83760569A 1969-06-30 1969-06-30

Publications (1)

Publication Number Publication Date
GB1319482A true GB1319482A (en) 1973-06-06

Family

ID=25274935

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2756270A Expired GB1319482A (en) 1969-06-30 1970-06-08 Hydraulic control system

Country Status (4)

Country Link
US (1) US3563137A (en)
JP (1) JPS503124B1 (en)
DE (1) DE2029826A1 (en)
GB (1) GB1319482A (en)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827587A (en) * 1969-07-31 1974-08-06 Carrier Corp Automatic self-leveling forks
FR2140722A5 (en) * 1971-03-22 1973-01-19 Poclain Sa
US3765554A (en) * 1971-07-12 1973-10-16 Maxon Industries Self-loading truck
US3901264A (en) * 1972-03-06 1975-08-26 Gresen Manufacturing Co Adjustable flow control for hydraulic valves having high pressure main supply and controls fluid flow to cylinder and exhaust ports
US3811587A (en) * 1972-07-17 1974-05-21 Case Co J I Hydraulic leveling circuit for implement
US3856163A (en) * 1972-07-17 1974-12-24 Case Co J I Method of using a hydraulic leveling circuit on an implement
US3901395A (en) * 1973-07-11 1975-08-26 Case Co J I Implement stabilization method and apparatus
US4122868A (en) * 1975-01-24 1978-10-31 International Harvester Company Hydraulic valve assembly having an axial flow force balanced spool
US3987920A (en) * 1975-06-23 1976-10-26 J. I. Case Company Self-leveling system for material handling implement
US4126083A (en) * 1977-02-07 1978-11-21 Caterpillar Tractor Co. Attitude control for implement
US4354797A (en) * 1979-05-31 1982-10-19 Hitachi Construction Machinery Co., Ltd. Front loading hydraulic excavator
US4408518A (en) * 1981-03-17 1983-10-11 The Cessna Aircraft Company Series self-leveling valve
DE3420058A1 (en) * 1984-05-29 1985-12-05 Edelhoff Polytechnik GmbH & Co, 5860 Iserlohn MOTOR DRIVEN GAS COLLECTING VEHICLE WITH CONTAINERS DESIGNED AS INTERCHANGEABLE CONTAINERS
US4709618A (en) * 1985-10-02 1987-12-01 The Cessna Aircraft Company Series self-leveling valve with single spool for unloading and relief
US4815357A (en) * 1987-07-21 1989-03-28 Lull Corp. Adjustable divided flow self-leveling system
US4923362A (en) * 1988-06-06 1990-05-08 Deere & Company Bucket leveling system with dual fluid supply
US5275086A (en) * 1992-08-27 1994-01-04 Unlimited Solutions, Inc. Fluid actuator with internal pressure relief valve
US5447094A (en) * 1994-02-07 1995-09-05 Delta Power Hydraulic Co. Hydraulic system for bucket self-leveling during raising and lowering of boom
JP3542373B2 (en) * 1994-03-15 2004-07-14 三陽機器株式会社 Hydraulic circuit for working of cargo handling machinery
US5797310A (en) * 1997-01-29 1998-08-25 Eaton Corporation Dual self level valve
US5919026A (en) * 1997-06-02 1999-07-06 Kann Manufacturing Corporation Carry can discharge floor
US6308612B1 (en) 1998-09-24 2001-10-30 Delta Power Company Hydraulic leveling control system for a loader type vehicle
US6389953B1 (en) 1998-09-24 2002-05-21 Delta Power Company Hydraulic leveling control system for a loader type vehicle
JP3923242B2 (en) * 2000-07-14 2007-05-30 株式会社小松製作所 Actuator control device for hydraulic drive machine
AU2001294901A1 (en) * 2000-10-03 2002-04-15 Husco International, Inc. Two-way, self-level valve
US6647718B2 (en) * 2001-10-04 2003-11-18 Husco International, Inc. Electronically controlled hydraulic system for lowering a boom in an emergency
US6868672B2 (en) * 2003-05-13 2005-03-22 Sauer-Danfoss, Inc. Method of controlling a swinging boom and apparatus for controlling the same
JP3992644B2 (en) * 2003-05-19 2007-10-17 ナブテスコ株式会社 Multiple direction switching valve with bucket translation function
DE10325296A1 (en) * 2003-06-04 2004-12-23 Bosch Rexroth Ag Hydraulic control arrangement
JP4454967B2 (en) * 2003-06-12 2010-04-21 ナブテスコ株式会社 Shunt mechanism and valve device
JP4805027B2 (en) * 2006-05-30 2011-11-02 ナブテスコ株式会社 Hydraulic control device for loader
CN101755155B (en) * 2007-07-18 2013-02-27 卢克摩擦片和离合器两合公司 Pressure relief valve for a hydraulic assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798626A (en) * 1953-11-19 1957-07-09 Clark Equipment Co Mechanism for materials handling machines
US3179120A (en) * 1963-05-24 1965-04-20 Koehring Co Proportional flow divider
US3251277A (en) * 1964-04-23 1966-05-17 Parker Hannifin Corp Fluid system and valve assembly therefor

Also Published As

Publication number Publication date
DE2029826A1 (en) 1971-01-21
US3563137A (en) 1971-02-16
JPS503124B1 (en) 1975-01-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee