EP2578754A2 - Deux cylindres servant aux fonctions d'inclinaison et de pas d'une lame de remblayage - Google Patents

Deux cylindres servant aux fonctions d'inclinaison et de pas d'une lame de remblayage Download PDF

Info

Publication number
EP2578754A2
EP2578754A2 EP12187472.1A EP12187472A EP2578754A2 EP 2578754 A2 EP2578754 A2 EP 2578754A2 EP 12187472 A EP12187472 A EP 12187472A EP 2578754 A2 EP2578754 A2 EP 2578754A2
Authority
EP
European Patent Office
Prior art keywords
blade
pitch
tilt
push
cylinders
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.)
Withdrawn
Application number
EP12187472.1A
Other languages
German (de)
English (en)
Inventor
Bryan D Sulzer
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.)
Deere and Co
Original Assignee
Deere and 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 Deere and Co filed Critical Deere and Co
Publication of EP2578754A2 publication Critical patent/EP2578754A2/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
    • E02F3/845—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically using mechanical sensors to determine the blade position, e.g. inclinometers, gyroscopes, pendulums
    • 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
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/7609—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers
    • E02F3/7618—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers with the scraper blade adjustable relative to the pivoting arms about a horizontal axis

Definitions

  • the present invention relates to bulldozers, and, more particularly relates to a hydraulic cylinder arrangement for effecting tilt and pitch control of a blade coupled to a dozer blade support frame.
  • U.S. Patents 3,184,869 and 5,996,703 each disclose a system including individual valves for controlling operation of right and left push-beam cylinders, but a selector valve is included by which tilt and pitch modes of operation are selected. Thus, no simultaneous tilt and pitch operations are possible for effecting a "blended" tilt and pitch movement of the dozer blade.
  • each control system includes right and left lift cylinders which are operative for raising and lowering the dozer blade, but this operation will also affect the pitch setting of the blade since the blade swings about the transverse axis defined by the coupling assemblies by which the push-beams are secured to the track frames.
  • an improved control arrangement for a bulldozer blade is provided.
  • An object of the present invention is to provide a bulldozer blade mounted at the front of a push frame for being pitched about a transverse axis defined by the coupling of the blade with the push frame and for being tilted about a longitudinal axis centered between opposite ends of the blade by simultaneous or separate operation of right and left push-beam cylinders.
  • the vehicle 10 includes a tractor 12 including a main frame 14 supported on an undercarriage 16 including right and left track assemblies positioned on laterally opposite sides of the tractor for propulsion of the vehicle 10, the track assemblies being mirror images of each other with only the left track assembly being shown at 18.
  • the left track assembly 18 includes a fore-and-aft extending track frame 20 carrying an idler 22 at its forward end and having a rear end positioned just ahead of a drive sprocket 23 rotatably mounted to the tractor main frame 14 in a position in fore-and-aft alignment with, the track frame 20.
  • an endless track assembly 26 Looped about the idler 22 and drive sprocket 24 and supported by upper and lower track support rollers 25 carried by the track frame 20 is an endless track assembly 26, here shown simplified and in phantom.
  • the undercarriage 16 may take any other suitable conventional form.
  • Mounted on an upper rear region of the main frame 14 is an operators station 28 from which an operator can control the vehicle 10.
  • a push frame 30 comprising fore-and-aft extending, right and left push-beams 32 and 34 respectively positioned laterally outwardly of, and having rear ends coupled to outer rear locations of, the right and left track assemblies by right and left pivot couplings 36 and 38, with only the connection of the left coupling with the left track assembly frame 20 being shown.
  • the right and left pivot couplings 36 and 38 define a transverse pivot axis 40 about which the push-beams 32 and 34 may pivot vertically.
  • the push frame 30 further includes a cross-beam assembly 42 including forwardly converging right and left beam sections having outer ends fixed to inner front regions of the push-beams 32 and 34 and having inner ends fixed together by a ball joint structure 44 allowing relative movement between them.
  • the cross-beam assembly 42 aids in the stability of the push frame 30.
  • a transverse blade 50 is coupled so as to be supported by the push frame 30.
  • the push-beams 32 and 34 project forwardly beyond the cross-beam assembly 42 and have forward ends respectively defined by right and left pivot couplings 52 and 54, the latter being respectively received between right and left upright plates of right and left coupling brackets 56 and 58, respectively located at lower right and left regions at the backside of the blade 50.
  • a coupling pin 60 secures the right pivot coupling 52 to the right coupling bracket 56 and a left coupling pin 62 secures the left pivot coupling 54 to the left coupling bracket 58, with the pins 60 and 62 defining a second transverse pivot axis 66 about which the blade 50 may be rocked, in a manner described below, to change its pitch angle relative to the ground.
  • right and left double-acting push-beam cylinders 68 and 70 are provided for effecting pitch and tilt angle changes of the blade 50, respectively, having respective cylinder ends pivotally coupled to the push-beams 32 and 34 at right and left brackets 72 and 74 at upper edge locations spaced rearwardly from respective forward ends of the push-beams 32 and 34, and having respective rod ends pivotally coupled to attachment brackets 76 and 78 respectively located at upper right and left end locations at the back side of the blade 50.
  • the push-beam cylinders 68 and 70 are individually controlled, in a manner described below, for pitching the blade 50 about the axis 66 and tilting the blade about a longitudinal axis 80 located in a vertical plane extending longitudinally halfway between the push-beams 32 and 34.
  • Right and left hydraulic lift cylinders 82 and 84 have their cylinder barrels respectively trunnion-mounted to upper, right and left forward regions at the opposite sides of the tractor 12, and have their respective rod ends coupled to right and left mounting brackets 86 and 88 at respective regions of the back side of the blade 50 respectively spaced inwardly of the right and left push-beam connection brackets 56 and 58, with a pair of pivot couplings 90, for example, or any other suitable coupler, being used for securing the lift cylinder rod ends to the brackets 86 and 88.
  • the operator can raise and lower the blade 50 relative to the tractor 12 using the lift cylinders 82 and 84.
  • FIG. 3 there is shown an electro-hydraulic control system 100 for controlling the operation of the push-beam cylinders 68 and 70, noting that while the lift cylinders 82 and 84 are illustrated, the operator lift input and lift control valve for controlling the cylinders 82 and 84 are omitted for the sake of brevity, with it to be understood that any conventional control arrangement for the selective extension and retraction of the cylinders 82 and 84 could be used.
  • the control system 100 includes first and second electro-magnetic direction control valves 102 and 104, respectively, with each control valve being coupled to a pump 106 by a branched supply line 108, and coupled to a sump 110 by a branched return line 112.shown here connected to the inlet of the pump 106, as well.
  • the first direction control valve 102 is respectively coupled to the head and rod ends of the right push-beam cylinder 68 by first and second pressure/return lines 114 and 116.
  • the second direction control valve 104 is respectively coupled to the head and rod ends of the left push-beam cylinder 70 by third and fourth pressure/return lines 118 and 120.
  • the upper and lower ends of the first direction control valve 102 respectively include right cylinder extend and contract solenoids 122 and 124.
  • the second direction control valve 104 includes upper and lower ends respectively provided with left cylinder extend and retract solenoids 126 and 128.
  • an electronic controller 130 which preferably is a microprocessor-based controller adapted to sense a plurality of inputs and responsively produce output signals which are delivered to the direction control valves 102 and 104.
  • the electronic controller 130 contains an operator command processor 132 coupled for receiving electrical operator inputs from operator tilt and pitch input devices 134 and 136, respectively, these devices being in the form of control levers, or the like, which operate a potentiometer or other suitable variable signal generating device that delivers an electrical signal at each different position of the tilt and input devices which is proportional to the movement of the lever in increasing distances from a neutral position.
  • the operator command processor 132 receives a current blade position signal from a position processor 138, which determines the blade position based upon generated feedback position signals received from position or stroke sensors 140 and 142 respectively associated with the push-beam cylinders 68 and 70; based upon a generated feedback position signal received from position or stroke sensors 144 and 146 respectively associated with the lift cylinders 82 and 84; and based upon information received from a table of geometric relationships 148 placed in the ROM of the controller 130, the table also providing information to the operator command processor 132.
  • a representative tilt and/or pitch value will be sent to a position limiting circuit 150 which determines from the signal received from the position processor whether or not one or the other of the cylinders 68 and 70 is approaching a position which might result in interference, or a desired preset position for holding or limiting the relative pitch and tilt angles of the blade. If such a stroke position is being approached, the position limiting circuit 150 sends an appropriate signal to the output conditioning circuit 152 which, in turn, acts to appropriately cut or reduce the command signal sent to one or the other or both of the control valves 102 and 104.
  • the position of the lift cylinders 82 and 84 is monitored by the stroke sensors 144 and 146 so that, if the lift cylinders 82 and 84 are used to elevate or lower the blade 50, this fact is taken into account for the purpose of modifying the pitch of the blade 50 through operation of the cylinders 68 and 70 in a direction and magnitude for compensating for any change in pitch occurring due to the repositioning of the height of the blade 50 by the lift cylinders 82 and 84.
  • control system 100 permits tilt and pitch input command signals to be simultaneously sent to the controller 130 and for "blended" output signals to be sent to the control valves 102 and 104 for simultaneously effecting pitch and tilt angle changes of the blade 50.
  • This allows the control system 100 and/or the operator to operate with more simultaneous degrees of freedom than is possible with the prior art control systems, which lends to improved operator finesse and, consequently, increased machine productivity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
EP12187472.1A 2011-10-07 2012-10-05 Deux cylindres servant aux fonctions d'inclinaison et de pas d'une lame de remblayage Withdrawn EP2578754A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/269,157 US20130087351A1 (en) 2011-10-07 2011-10-07 Dual Cylinders For Effecting Tilt And Pitch Functions Of A Dozer Blade

Publications (1)

Publication Number Publication Date
EP2578754A2 true EP2578754A2 (fr) 2013-04-10

Family

ID=46968087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12187472.1A Withdrawn EP2578754A2 (fr) 2011-10-07 2012-10-05 Deux cylindres servant aux fonctions d'inclinaison et de pas d'une lame de remblayage

Country Status (3)

Country Link
US (1) US20130087351A1 (fr)
EP (1) EP2578754A2 (fr)
JP (1) JP2013083143A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106759589A (zh) * 2016-12-09 2017-05-31 广西玉柴重工有限公司 一种挖掘机可倾斜推土铲装置
US20200407951A1 (en) * 2018-06-29 2020-12-31 Komatsu Ltd. Work machine and system including work machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9615499B2 (en) 2014-12-03 2017-04-11 Cnh Industrial Canada, Ltd. Hydraulic work unit leveling and calibration system for an agricultural implement
US9689142B2 (en) 2015-05-15 2017-06-27 Cnh Industrial America Llc Radial pattern mechanically adjustable blade pitch mount
US9945096B2 (en) 2016-02-10 2018-04-17 Deere & Company Force-based work vehicle blade pitch control
CN113309160B (zh) * 2021-06-25 2023-02-07 三一重机有限公司 推土铲过载保护结构及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184869A (en) 1963-09-30 1965-05-25 Allis Chalmers Mfg Co Dozer hydraulic tilt and pitch control
US5996703A (en) 1996-02-12 1999-12-07 Komatsu Ltd. Dozing apparatus of a bulldozer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044838A (en) * 1975-04-21 1977-08-30 American Tractor Equipment Corporation Automatic control for ripper tool
US5950141A (en) * 1996-02-07 1999-09-07 Komatsu Ltd. Dozing system for bulldozer
US5685377A (en) * 1996-09-05 1997-11-11 Caterpillar Inc. Auto-return function for a bulldozer ripper
US6129155A (en) * 1998-12-02 2000-10-10 Caterpillar Inc. Method and apparatus for controlling a work implement having multiple degrees of freedom
US8333248B1 (en) * 2011-06-20 2012-12-18 Bryan D Sulzer Automatic pitch hold of a electrohydraulically controlled ripper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184869A (en) 1963-09-30 1965-05-25 Allis Chalmers Mfg Co Dozer hydraulic tilt and pitch control
US5996703A (en) 1996-02-12 1999-12-07 Komatsu Ltd. Dozing apparatus of a bulldozer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106759589A (zh) * 2016-12-09 2017-05-31 广西玉柴重工有限公司 一种挖掘机可倾斜推土铲装置
US20200407951A1 (en) * 2018-06-29 2020-12-31 Komatsu Ltd. Work machine and system including work machine

Also Published As

Publication number Publication date
JP2013083143A (ja) 2013-05-09
US20130087351A1 (en) 2013-04-11

Similar Documents

Publication Publication Date Title
EP2578754A2 (fr) Deux cylindres servant aux fonctions d'inclinaison et de pas d'une lame de remblayage
US9873991B2 (en) Frame distortion control
US9637889B2 (en) Automated moldboard draft control system and method
US4201268A (en) Adjustment mechanism for dozer blade
US4405019A (en) Adjustment and stabilizer mechanism for dozer blade
US5403144A (en) Blade tilt assembly for a front end loader
US3631930A (en) Mounting arrangement for bulldozer blades
US9593461B2 (en) Work tool pitch control system for a machine
CA3064719C (fr) Commande de lame au-dessous de la conception
EP1118719A2 (fr) Système de régulation de la hauteur de lame d'une niveleuse motorisée
US10036139B2 (en) Machine input device having multi-axis tool control
JPS5980829A (ja) 整地スクレ−パ付きトラクタ
AU2020244560A1 (en) Blade Levelling Apparatus & Mounting System
US20060096137A1 (en) Coordinated linkage system for a work vehicle
EP3155183B1 (fr) Excavateur
US20160194853A1 (en) Split Walking Beams for Raising and Lowering Respective Sides of a Vehicle or Implement Frame to Control a Tilt Angle or Height Thereof
US3677350A (en) Hydraulic motor grader blade lift, centershift control
US11629477B2 (en) Self-propelled work vehicle and control method for blade stabilization accounting for chassis movement
US3513916A (en) Elevation control for excavator
US20080210446A1 (en) Dozer blade tilt with independent functioning lift cylinders
US4175625A (en) Articulating grader having structure for raising and lowering mold board without disturbing setting
DE102022109094A1 (de) System und verfahren zum kippen einer kettenladerschaufel zum erreichen einer gewünschten querneigung
US3324583A (en) Articulated grader
US10760243B2 (en) Work tool attachment for a work machine
US11821162B2 (en) System and method for adaptive calibration of blade position control on self-propelled work vehicles

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20160503