US3782572A - Public works machine - Google Patents

Public works machine Download PDF

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Publication number
US3782572A
US3782572A US00235442A US3782572DA US3782572A US 3782572 A US3782572 A US 3782572A US 00235442 A US00235442 A US 00235442A US 3782572D A US3782572D A US 3782572DA US 3782572 A US3782572 A US 3782572A
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United States
Prior art keywords
drive wheels
hydraulic
wheels
pressure
vehicle
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Expired - Lifetime
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US00235442A
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English (en)
Inventor
J Gautier
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Poclain SA
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Poclain SA
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Publication date
Application filed by Poclain SA filed Critical Poclain SA
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Publication of US3782572A publication Critical patent/US3782572A/en
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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
    • E02F3/434—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like providing automatic sequences of movements, e.g. automatic dumping or loading, automatic return-to-dig

Definitions

  • This invention relates to a method for adjusting the position of the working equipment with which a public [21] PP N04 2351442 works machine is provided, which is constituted by a group of front drive wheels and a group of rear drive wheels, by said working equipment which is articu- [30] Foreign Application P i i D lated to the frame of the machine, whilst a double- Mar. 22 i971 France 7110033 effect drive member is Coupled between the working V H equipment and the frame and comprises two chambers connected selectively to a source of pressurised fluid 52 U.S. c1.
  • the present invention relates to a method of adjusting the position of the working equipment of a public works machine, and machine carrying out said method.
  • the invention proposes precisely to remedy the above-mentioned disadvantages and to this end has firstly for an object a method by which a substantially permanent contact of the wheel assembly of the machine may be ensured on the ground.
  • the invention also has for an object the machines applying the method.
  • the invention therefore relates to a method of adjusting the position of the working equipment with which a public works machine is provided, which is constituted by a group of front drive wheels and a group of rear drive wheels, by said working equipment, which is articulated on the frame of the machine, whilst a douhie-effect drive member is coupled between the working equipment and the frame, and comprises two chambers selectively connected to a source of pressurised fluid and to a discharge tank, or isolated from said sources of fluid and tank.
  • the working equipment is disposed in a predetermined position, isolating said two chambers, and the displacement of the machine is controlled.
  • the position of the working equipment subsequent to the predetermined position is made to be a function of the values of the resistant torques of the front and rear groups os wheels.
  • the invention also has for its object a public works machine applying the above-mentioned method.
  • This machine is constituted by a group of front drive wheels and by a group of rear drive wheels, by at least one bydraulic drive motor coupled to each group of drive wheels and connected to a source of pressurised fluid by a feed conduit, by a working equipment articulated to the frame of the machine, by a first double-effect drive member which is coupled between the working equipment and the frame and comprises two chambers, by a first and a second conduit connected respectively to said two chambers, a first distributor with at least three positions connecting, in a first position, the first conduit to a source of pressurized fluid and the second conduit to a discharge tank, connecting, in a second postion, the first conduit to said discharge tank and the second conduit to the source of pressurised fluid and isolating, in a third position, said two chambers from said tank and source of fluid.
  • Third and fourth conduits are connected in shunt to the first and second conduits respectively between the first drive member and the first distributor, whilst a second distributor with three positions is interposed on the third and fourth conduits between on the one hand the connections of said third and foruth conduits to the first and second conduits and, on the other hand, a source of pressurized fluid and a discharge tank, and this second distributor, in its first position, connects the third conduit to said latter source of pressurised fluid and the fourth conduit to said latter discharge tank, in its second position, connects the third conduit to the discharge tank and the fourth conduit to the source of pressurized fluid, and in its third position, isolates the first and second conduits from the source of pressurised fluid and from the discharge tank.
  • fifth and sixth conduits are connected on the one hand to the conduits feeding the hydraulic motor or motors driving the groups of front and rear drive wheels respectively, on the other hand to the two chambers of a second drivemernber for controlling the position of the movable member of the second distributor coupled between said movable member and the body of said second distributor.
  • the second drive member advantageously comprises a body and an element which is movable with respect to said body, whilst an elastic element is interposed between said movable element and said body of said second drive member.
  • a third distributor is advantageously interposed on the third and fourth conduits between the connections of said third and fourth conduits to the first and second conduits, and the second distributor, whilst this third distributor has two positions, in a first position of said third distributor, the first and second conduits are connected to the inlet of the second distributor, and in the second position of the third distributor, the first and second conduits are connected to the inlet of the second distributor, and in the second position of the third distributor, the first and second conduits are isolated from said second distributor.
  • the first and second drive members are preferably constituted by double'effect hydraulic jacks.
  • FIGS. 1 and 2 schematically show a machine of the loading type in the course of two cases of use:
  • FIG. 3 shows the hydraulic circuit of a machine according to the invention.
  • a public works machine such as a loader, may, in a first phase of use, tend to take the position of FlG. l.
  • the machine advances, the bucket l abuts on the material 2 and does not manage to penetrate into said material.
  • the force of reaction of the material 2 on the bucket l is transmitted, by the working equipment 3, to the frame d of the machine, the front wheels 5 of which tend to lose contact with the ground 6.
  • a double-effect jack 8 is coupled between the working equipment 3, which is articulated to the frame 4 about axis 9, and said frame 4.
  • the rod of the piston of the jack is articulated to the working equipment 3 about axis 10 and the cylinder is articulated to the frame 4 about axis 11.
  • FIG. 3 shows the jack 8 having two chambers 12 and 13 connected to a first distributor 14 via a first conduit 15 and a second conduit 16 respectively.
  • the distributor 14 is itself connected by conduits 17 and 18, respectively, to a hydraulic pump 19 and to a discharge tank 20.
  • the movable member of the distributor 14 has three positions which correspond respectively, the first position to the communications of conduit 15 with conduit 17 and of conduit 16 with conduit 18, the second position to the communications of conduit 15 with conduit 18 and of conduit 16 with conduit 17, and finally, the third position, to the communication of the conduit 17 with conduit 8,. and to the isolation of conduits 15 and 16.
  • each of these motors comprises two chambers that may be selectively placed in communication with a pump 23, 24, and with the discharge tank 20, by means of distributors and 26 with possibly coupled controls.
  • These distributors are three-way distributors. They are connected on the one hand to the two chambers of each motor by two conduits, the distrubutor 25 by conduits 27 and 28 of the motor 21, the distributor 26 by conduits 29 and to distributor 26, on the other hand, to pumps 23, 24 and to tank 20, the distributor 25 by conduits 31 and 32, the distributor 26 by conduits 33 and 34.
  • each distributor places conduits 27 and 31, 28 and 32, 29 and 33, 30 and 34 in communication; whilst the selection of the second position of these distributors places conduits 27 and 32, 28 and 31, 29 and 34, 30 and 33 in communication.
  • the third position of the distributors 25 and 26 corresponds to the communicating of the conduits 31 and 32 and 33 and 34 to the isolation of conduits 27, 28, 29 and 30 from pumps 23, 24 and tank 20.
  • a distributor 35 is connected on the one hand by conduits 36, 37, respectively, to conduits l5 and 16 art, on the other hand, by conduits 38, 39 to the delivery of a pump 40 and to the discharge tank 20.
  • the distributor 35 places conduits 37 and 38, and conduits 36 and 39 in communication, whilst, in its second position, this distributor communicates conduits 36 and 3d and conduits 37 and 39.
  • the conduit 38 is placed in communication with conduit 39 and duits 36 and 37 are isolated from pump 40 and tank 20.
  • a jack in two parts is coupled to the movalbe member of the distributor 35, afirst chamber 41 of said jack, in which the piston 42 moves, being connected by conduit 43 to conduit 27 which feeds motors 21 in the sense corresponding to the forward movement of the machine, whilst a second chamber 44 of the jack, in which piston 45 moves, is connected by conduit 46 to conduit 29 which feeds motors 22 in the sense likewise corresponding to the forward movement of the machine.
  • a spring 48 is interposed between the piston 42 and the body of the distributor 35.
  • a two way distributor 47 is interposed on conduits 36 and 37. in a first position, the distributor 47 maintains the free communication between the two parts of each of conduits 36, 37 whilst, in its second position, it isolates parts of conduits 36, 37, connected to conduits 15, A6 of the distributor 35, and places in communication the remaining parts of the conduits 36, 37, connected to the distributor 35. It is possible to select positions of distributor 47 by acting on lever 47a.
  • conduits that may be placed in communication with the deliveries of the pumps are provided with shunt conduits 49 which are connected to the discharge tank 20 and on which a discharge valve 50 is interposed. It is also known to connect the suction of the different pumps to the tank 20 by conduits 5E.
  • the pump 40 feeds pressurised fluid tochamber E3 of jack 8.
  • the above-mentioned servocontrol can be provisionally neutraiised as desired. This is the case where, in order to change a front wheel 5, for example, it is desired to remove this wheel 5 from the ground 7 and to keep it removed. To this end, it is sufficient to dispose the distributor 457, by acting on lever 47a, on its second position, and to isolate in this way the jack 8 from the servo-control to which it was previously subjected.
  • the range of difference between the pressures prevailing in the conduits 43 and 46 is adjustable by the choice of the value of the tightness of spring 48, in the same way as the range of pressures themselves may be adjusted by adapting the sections of pistons 42 and 45.
  • the resulting functioning of the use of the machine which has been described therefore comes from an automatic control of the resistant torques acting concomitantly on the wheels of the two groups of front wheels 5 and rear wheels 7, and from automatic adjustment of the position of the working equipment 3 controlled by the values of these resistant torques.
  • a method of operating an earthworking machine of the type having an earthworking implement mounted for vertical adjustment on a supporting vehicle having front drive wheels and rear drive wheels comprising the steps of driving the front and rear drive wheels to move the vehicle in a forward direction, monitoring the drive torque applied to the front drive wheels and the rear drive wheels, causing said earthworking implement to be moved upwardly in response to the detection of substantially less drive torque being applied to the front drive wheels than to the rear drive wheels and causing said earthworking implement to be moved downwardly in response to detection of substantially less torque being applied to said rear drive wheels than said front drive wheels.
  • step of monitoring the drive torque to the front drive wheels and to the rear drive wheels is accomplished by sensing the infeed pressure of hydraulic drive fluid supplied to respective hydraulic drive motors driving said front drive wheels and said rear drive wheels.
  • An earthworking machine comprising a vehicle having front drive wheels and rear drive wheels, front motor means drivingly coupled to said front drive wheels, rear motor means drivingly coupled to said rear drive wheels, an earth-working implement mounted on said vehicle and extending forwardly from said vehicle for engagement with a surface being worked, power adjusting means for adjusting the vertical height of said earthworking implement with respect to said vehicle, control means responsive to a lowering of the resistance to forward rotation of said front drive wheels to a level substantially less than the resistance to forward rotation of the rear drive wheels for actuating said power adjusting means to move said earthworking implement upwardly with respect to said vehicle and responsive to a lowering of the resistance to forward rotation of said rear drive wheels to a level substantially less than the resistance to forward rotation of said front drive wheels for actuating said power adjusting means to lower said earthworking implement with respect to said vehicle.
  • control means includes pressure comparing means for comparing the inlet pressure of said front hydraulic motor with the inlet pressure of said rear hydraulic motor.
  • control means incudes a pilot valve having a movable control member, a first pressure responsive power means connected to a hydraulic power conduit extending from a source of hydraulic pressure'to an inlet on said front hydraulic motor and a second pressure responsive power means connected to a hydraulic power conduit extending from a source of hydraulic pressure to an inlet on said rear hydraulic motor, said first and second pressure responsive power means being connected to said movable control member in opposing manner whereby each pressure responsive power means tends to oppose operation of the other and a lowering of the pressure in either power conduit below the pressure in the other power conduit causes said control member to be shifted by the pressure responsive power means con nected to the power conduit having the higher pressure.
  • said power adjusting means comprises a hydraulic actuator comprising a piston and cylinder assembly connected between said earthworking implement and said vehicle, first and second conduits extending between said piston and cylinder assembly and said pilot valve, a hydraulic pressure source line also connected to said pilot valve, said movable control member including internal passageways for directing pressurized hydraulic fluid from said hydraulic pressure source line to one or the other of said conduits connected to said hydraulic cylinder when said first and second pressure responsive power means are creating an unbalanced force on said movable control member.
  • the invention of claim 8 additionally including manually operable valve means connected to said conduits between said pilot valve and said hydraulic cylinder for blocking said conduits from communication with said pilot valve.
  • the invention of claim 9 further including selectively operable valve means for providing pressurized hydraulic fluid to said first and second conduits selectively at a point between said manual valve means and said hydraulic cylinder.
  • a method for operating an earthworking machine of the type having an earthworking implement mounted for vertical adjustment on a supporting vehicle having front drive wheels and rear drive wheels comprising the steps of driving the front and rear drive wheels to move the vehicle, monitoring the drive torque applied to the front drive wheels and the rear drive wheels, causing said earthworking imple ment to be moved vertically in response to the detection of substantially less drive torque being applied to either the front drive wheels or the rear drive wheels than is being applied to the other wheels to lower the wheels having the lower drive torque to consequently increase the drive torque of said wheels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Operation Control Of Excavators (AREA)
US00235442A 1971-03-22 1972-03-16 Public works machine Expired - Lifetime US3782572A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7110033A FR2140722A5 (pt) 1971-03-22 1971-03-22

Publications (1)

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US3782572A true US3782572A (en) 1974-01-01

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US00235442A Expired - Lifetime US3782572A (en) 1971-03-22 1972-03-16 Public works machine

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US (1) US3782572A (pt)
AR (1) AR193724A1 (pt)
BE (1) BE780613A (pt)
BR (1) BR7201594D0 (pt)
DE (1) DE2213167C2 (pt)
ES (1) ES401082A1 (pt)
FR (1) FR2140722A5 (pt)
GB (1) GB1357993A (pt)
IT (1) IT953995B (pt)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905501A (en) * 1973-02-09 1975-09-16 Poclain Sa Control means for public works machine
WO1981001690A1 (en) * 1979-12-10 1981-06-25 A Manna Differential lock control
US4320813A (en) * 1979-12-10 1982-03-23 Caterpillar Tractor Co. Differential lock control
WO1995033896A1 (en) * 1994-06-07 1995-12-14 Hdrk Mining Research Limited Sensor feedback control for automated bucket loading
DE19528134A1 (de) * 1995-08-01 1997-02-06 Bernhard Grimm Radlager-Zusatzschaufel für Kabelgräben und Fundamente
US5968103A (en) * 1997-01-06 1999-10-19 Caterpillar Inc. System and method for automatic bucket loading using crowd factors
US5974352A (en) * 1997-01-06 1999-10-26 Caterpillar Inc. System and method for automatic bucket loading using force vectors
US6211471B1 (en) 1999-01-27 2001-04-03 Caterpillar Inc. Control system for automatically controlling a work implement of an earthmoving machine to capture, lift and dump material
DE19961801B4 (de) * 1998-12-21 2006-12-07 Komatsu Ltd. Hydrauliksteuervorrichtung für ein Nutzfahrzeug
US20080127530A1 (en) * 2006-11-30 2008-06-05 Deere & Company Automated Blade with Load Management Control
US20080234902A1 (en) * 2007-03-20 2008-09-25 David August Johnson Method and system for controlling a vehicle for loading or digging material
US20080234901A1 (en) * 2007-03-20 2008-09-25 Daivd August Johnson Method and system for controlling a vehicle for loading or digging material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233691A (en) * 1962-10-17 1966-02-08 Biasi Charles P De Hydraulic system, apparatus and arrangement for driving and steering vehicles
US3542228A (en) * 1968-03-08 1970-11-24 Case Co J I Hydrostatic control device for loader tractor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231117A (en) * 1962-10-23 1966-01-25 Tractor vehicle and drive therefor
US3388821A (en) * 1966-09-22 1968-06-18 Warner Swasey Co Hydraulic control means for loaders
US3563137A (en) * 1969-06-30 1971-02-16 Cessna Aircraft Co Hydraulic self-leveling control for boom and bucket

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233691A (en) * 1962-10-17 1966-02-08 Biasi Charles P De Hydraulic system, apparatus and arrangement for driving and steering vehicles
US3542228A (en) * 1968-03-08 1970-11-24 Case Co J I Hydrostatic control device for loader tractor

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905501A (en) * 1973-02-09 1975-09-16 Poclain Sa Control means for public works machine
WO1981001690A1 (en) * 1979-12-10 1981-06-25 A Manna Differential lock control
US4320813A (en) * 1979-12-10 1982-03-23 Caterpillar Tractor Co. Differential lock control
WO1995033896A1 (en) * 1994-06-07 1995-12-14 Hdrk Mining Research Limited Sensor feedback control for automated bucket loading
AU680134B2 (en) * 1994-06-07 1997-07-17 Noranda Inc. Sensor feedback control for automated bucket loading
US5941921A (en) * 1994-06-07 1999-08-24 Noranda Inc. Sensor feedback control for automated bucket loading
DE19528134A1 (de) * 1995-08-01 1997-02-06 Bernhard Grimm Radlager-Zusatzschaufel für Kabelgräben und Fundamente
DE19800184B4 (de) * 1997-01-06 2007-01-04 Caterpillar Inc., Peoria System und Verfahren zur automatischen Schaufelbeladung unter Verwendung von Kraftvektoren
US5968103A (en) * 1997-01-06 1999-10-19 Caterpillar Inc. System and method for automatic bucket loading using crowd factors
US5974352A (en) * 1997-01-06 1999-10-26 Caterpillar Inc. System and method for automatic bucket loading using force vectors
DE19800185B4 (de) * 1997-01-06 2007-02-08 Caterpillar Inc., Peoria System und Verfahren zur automatischen Schaufelbeladung unter Verwendung von Massendurchdringungsfaktoren
DE19961801B4 (de) * 1998-12-21 2006-12-07 Komatsu Ltd. Hydrauliksteuervorrichtung für ein Nutzfahrzeug
US6211471B1 (en) 1999-01-27 2001-04-03 Caterpillar Inc. Control system for automatically controlling a work implement of an earthmoving machine to capture, lift and dump material
US20080127530A1 (en) * 2006-11-30 2008-06-05 Deere & Company Automated Blade with Load Management Control
US8726543B2 (en) * 2006-11-30 2014-05-20 Deere & Company Automated blade with load management control
US20140277966A1 (en) * 2006-11-30 2014-09-18 Deere & Company Automated blade with load management control
US9038289B2 (en) * 2006-11-30 2015-05-26 Deere & Company Automated blade with load management control
US20080234902A1 (en) * 2007-03-20 2008-09-25 David August Johnson Method and system for controlling a vehicle for loading or digging material
US20080234901A1 (en) * 2007-03-20 2008-09-25 Daivd August Johnson Method and system for controlling a vehicle for loading or digging material
WO2008115546A3 (en) * 2007-03-20 2008-11-06 Deere & Co Method and system for controlling a vehicle for loading or digging material
US7853384B2 (en) 2007-03-20 2010-12-14 Deere & Company Method and system for controlling a vehicle for loading or digging material
US8036797B2 (en) * 2007-03-20 2011-10-11 Deere & Company Method and system for controlling a vehicle for loading or digging material

Also Published As

Publication number Publication date
FR2140722A5 (pt) 1973-01-19
IT953995B (it) 1973-08-10
DE2213167A1 (pt) 1972-09-28
BE780613A (fr) 1972-07-03
ES401082A1 (es) 1975-02-16
GB1357993A (en) 1974-06-26
AR193724A1 (es) 1973-05-22
DE2213167C2 (de) 1982-04-29
BR7201594D0 (pt) 1973-06-12

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