US3905501A - Control means for public works machine - Google Patents

Control means for public works machine Download PDF

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Publication number
US3905501A
US3905501A US438378A US43837874A US3905501A US 3905501 A US3905501 A US 3905501A US 438378 A US438378 A US 438378A US 43837874 A US43837874 A US 43837874A US 3905501 A US3905501 A US 3905501A
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US
United States
Prior art keywords
pipe
regulator
pipes
chambers
automatically operable
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
US438378A
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English (en)
Inventor
Jean E Leroux
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.)
Poclain SA
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Poclain SA
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 Poclain SA filed Critical Poclain SA
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Publication of US3905501A publication Critical patent/US3905501A/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance

Definitions

  • a public works machine comprising:
  • a double-acting drive member coupled between said frame and said working equipment and which comprises two chambers;
  • the machine also comprises a two-position regulator, in the first position of which corresponds to effective operation of said automatically operable means, communication can be established between said two chambers of said drive device and fluids at pressures corresponding to those in said feed pipes to said front and rear motors, and in the second position of which, which corresponds to the placing of said automatically operable means out of operation, said two chambers of the drive device are placed in communication with said discharge reservoir means.
  • a two-position regulator in the first position of which corresponds to effective operation of said automatically operable means, communication can be established between said two chambers of said drive device and fluids at pressures corresponding to those in said feed pipes to said front and rear motors, and in the second position of which, which corresponds to the placing of said automatically operable means out of operation, said two chambers of the drive device are placed in communication with said discharge reservoir means.
  • the feed pipes to said front and rear motors may be connected respectively by said third and fourth pipes to said two chambers of said drive device.
  • said two-position regulator is preferably interposed between said third and fourth pipes and said feed pipes. In its first positionit places said third and fourth pipes in communication with said feed pipes, and in its second position it places said third and fourth pipes in communication with said discharge reservoir 1 ,-.
  • the machine comprises a secondlthree position regulator to which is coupled a second automatically operable means for selection of thejposition'pf the second three-position regulator in I merriber tending to maintain said second regulator in its third position, when the effects of the pressure of fluids in saidtwofchambers are equal and opposite said two chambers of said second automatically operable device being connected respectively by pipes to said feed pipes to' said front and rear motors, and wherein said third *andfourth pipes are connected to said second three-position regulator, a fifth pipe connected to means forsupplying fluid under pressure and a sixth pipe conirected to a discharge reservoir are connected to said second three-position regulator, the three positions of said second three-position regulator correspond to the preponderance of the effect
  • said two-position regulatordsr arranged in said fifth pipe which it separates intotwo portions and is connected by a seventh pipe to.-said;discharge reservoir means, in its first position said two-position regulator places said two portions of said .fifth pipe to which it is connected in communication in its second position said two-position regulatorisolates said two portions of the fifth pipe from one another. and places said seventh pipe in communication with that one of said two portions of said fifth pipe which'is, connected to said second three-position regulator.
  • FIGS land 2 illustrates diagrammatically a machine of the loader. type during two phases of use
  • FIG. 3 shows the hydraulic circuit of an embodiment of a machine in accordance with the invention.
  • FIG.,4 shows the hydraulic circuit of another embodiment of a machine in accordance with the invention
  • a publicworks machine such as a loader, may in a first phase of use tend to adopt the position shown in FIG. 1.
  • the bucket l bears on material 2 but does not succeed in penetrating into the material.
  • the force of the reaction of the material 2 against the bucket 1 is transmitted by the working equipment 31 0 the frame 4 of the machine with the result that the front wheels 5 of the machine tend to lose contact with the ground 6.
  • a double-acting jack 8 is coupled between the working equipment 3, which is articulated on the frame 4 for pivotal movement about the axis 9, and the said frame 4.
  • the pistonrod of the jack is articulated on the working equipment 3 for pivotal movement about the axis 10 and the cylinder is articulated on the frame 4 for pivotal movement about axis 11.
  • the two chambers 12 and 13 of the jack are connected to a first three-position regulator 14 respectively by a first pipe 15 and a second pipe 16.
  • the regulator 14 is in turn connected by pipes 17 and 18 to a hydraulic pump 19 and a discharge reservior 20 respectively.
  • the movable member of the regulator 14 has three positions as follows:
  • the pipe 15 is placed in communication with the pipe 18 and the pipe 16 with the pipe 17, and
  • each of these motors comprises two chambers capable selectively of being put in communication with a pump 23, 24 respectively and with the discharge reservoir 20 by means of manually operatable regulators 25, 26 which may, if required, be coupled.
  • These regulators each have three positions. They are connected to the two chambers of the respective motor by two pipes, the regulator 25 by the pipes 27 and 28 to the motor 21, the regulator 26 by the pipes 29 and to the motor 22, and to the pumps 23, 24 and the reservoir 20, the regulator 25 by the pipes 31 and 32, the regulator 26 by the pipes 33 and 34. In the first position of each regulator 25, 26 the pipes 27 and 31, 28 and 32, 29 and 33, 30 and 34 are placed in communication.
  • the regulator 14 is provided with a lever 35 for optional manual, as shown, or pedal control of the positiin of its movable member.
  • the regulator 14 is coupled to a resilient member 36 which acts to bias the movable member of the regulator 14 to its third position, and to a double-acting jack indicated diagrammatically by the chambers 37 and 38, the action of fluid under pressure capable of being contained in the chambers 37, 38 being opposite that of the resilient member 36.
  • a two-position regulator 39 is connected by pipes 40 and 41 to the chambers 37 and 38 respectively, and by pipes 42 and 43 to the delivery pipes 31 and 33 respectively, from the pumps 23 and 24.
  • a pipe 44 connects the regulator 39 to the reservoir 20.
  • the regulator 39 has a manual control 45.
  • the two positions of its movable member are as follows:
  • pipes 46 connect the delivery pipes 17, 31, 33 of the various pumps to the reservoir 20 by means of pipes 18, 32 and 34, respectively, a calibrated discharge valve 47 being arranged in each of the pipes 46.
  • FIG. 4 a number of the members already described with reference to FIGS. 1 to 3 are again found. Similar members are indicated by the reference numbers used in FIGS. 1 to 3.
  • the pipe 18 consists of two sections 18a and 18b which are connected to the distributor 14, a non-return valve 48 being arranged in the section 18a of the said pipe 18, which is tapped off from the delivery pipe 17 from the pump 19.
  • the section 18b is connected to the reservoir 20.
  • the non-return valve 48 enables flow of the fluid from the pump 19 towards the regulator 14 through the pipe 18a.
  • the three positions of the regulator 14 are therefore as follows;
  • Another three-position regulator 49 is coupled to a resilient member 50 which acts to bias the movable member of the regulator 49 into one of its positions, called the third position or mean position, and to a double-acting jack indicated diagrammatically by the chambers 51 and 52, the action of fluid under pressure capable of being contained in the chambers 51, 52 being opposite to that of the resilient member 50.
  • the chambers 51 and 52 are connected by pipes 53 and 54 to the delivery pipes 31 and 33 from the pumps 23 and 24 respectively.
  • a pipe 62 connects the regulator 49 to the reservoir 20.
  • a two-position regulator 55 is connected to the delivery pipe 56 from a low-pressure pump 57, and to the reservoir 20 by a pipe 58. Finally, a pipe 59 connects the regulators 49 and 55.
  • the pump 57 is connected to the reservoir 20 by its suction pipe 60, and a pipe 46 is tapped off from the delivery pipe 56 and is connected to the reservoir 20, a calibrated discharge valve 47 being arranged in the pipe 46.
  • the regulator 55 is provided with a manual controller 61 for controlling the position of its movable member.
  • the three positions of the regulator 49 are as follows:
  • the two positions of the regulator 55 are as follows:
  • the pumps 19, 23 and 24 are again connected to the reservoir by suction pipes 63.
  • the pump 19 through the pipes 17 and 16 feeds the chamber 13 of the jack 8 with fluid under pressure.
  • the rod of the jack 8 is thus, biased outwardly, which brings about a lifting of the working equipment 3 and consequently a return of the front wheels 5 towards the ground 6.
  • the relative torque opposing those wheels increases again and the pressure in the pipes 27, 31 and 42 and 41 likewise increases.
  • the movable member of the regulator 14 is then biased towards its intermediate position (third position) under the effect of the return member 36.
  • the pump 19 delivers fluid to the reservoir 20 through; the pipes 17 and 18 and, because the pipes 15 and 16 are blocked at the distributor 14, the chambers 12 and 13 of the jack 8 are isolated and the rod of the said jack 8 is maintained in position with respect to the cylinder. of this jack.
  • the functioningof the machine which has been describedthus is an automatic control of the opposing torques acting concomitantly on the wheels of the two sets of front 6 and rear wheels 4, and an automatic subordinate adjustment of the position of the working equipment 3 to the values of these opposing torques.
  • the best possible adhesion of the driving wheels 5 and 7 is obtained and consequently, at given power from themachine, the maximum force of penetratiori for thetool 1, without its being necessary for the driver of the machine to have to appreciate the adhesion conditions at the time, or to be particularly experienced in reacting in optimum manner.
  • FIG. 3 is considerably simpler than that described in the above referred to US. Pat. No. 3,782,572 in the sense that the regulator 14 and the pump ,19 are used both to supply fluid under pressure to one of the chambers 12 or 13 and place the other chamber in communication with the reservoir 20 by operation on the lever 35, and to subordinate the position of the working equipment 3 to the values of the torques opposing the wheels 5 and 7 by the action of fluid in the chambers 37 and 38 and of the resilient member 36.
  • the regulator 55 is similar to the regulator 39 of FIG. 3.
  • the distributor 55 is in its first position.
  • the pressures of the fluids in the feed pipes 27 and 29 to the motors 21 and 22, and consequently in the pipes 31 and 53 and 33 and 54 act to place the movable member of the regulator 49 in one of its positions.
  • the pressure falls in the pipes 27, 31 and 53 so that the regulator 49 is placed in its first position.
  • Fluid delivered to the pipe 56 by the lowpressure pump 57 flows through the pipes 59 and 40 to the chamber 37 while the chamber 38 is placed in communication with the reservoir 20 through the pipes 41 and 62.
  • the regulator 14 is placed in its second position.
  • a public works machine comprising:
  • a double-acting drive member coupled between said frame and said working equipment and which comprises two chambers;
  • a three-position regulator comprising the sole valve means for providing work fluid for said doubleacting drive member which:
  • automatically operable control means for automatically positioning said regulator in accordance with the values of the torques opposing said front and rear sets of wheels and comprising a doubleacting drive device having two chambers which are respectively connected to a third pipe and a fourth pipe which can be placed in communication respectively with fluids at pressure corresponding to those in said feed pipe to said front and rear motors, and a return member tending to maintain said regulator in its third position when the effects of the pressure of fluids in said two chambers are equal and opposite.
  • said automatically operable control means includes a second three position regulator to which is coupled a second automatically operable means for selection of the position of the second three position regulator in dependance on the values of the torques opposing the front and rear wheels and which comprises a double-acting drive device having two chambers and a return member tending to maintain said second regulator in its third position, when the effects of the pressures of fluids in said two chambers are equal and opposite said two chambers of said second automatically operable device being connected respectively by pipes to said feed pipes to said front and rear motors, and wherein said third and fourth pipes are connected to said second three-position regulator, a fifth pipe connected to means for supplying fluid under pressure and a sixth pipe connected to a discharge reservoir are connected to said second three-position regulator, the three positions of said second three-position regulator correspond to the preponderance of the effect of fluid in one or other of said chambers of said second automatically operable means, or with equality of the said effects, and said second three-position regulator connects said third pipe to said fifth pipe
  • feed pipes to said front and rear motors are respectively connectable by said third and fourth pipes to respective ones of said chambers of said drive device.
  • said automatically operable control means includes a second three-position regulator to which is coupled a second automatically operable means for selection of the position of the second three-position regulator in dependance on the values of the torques opposing the front and rear wheels and which comprises a double-acting drive device having two chambers and a return member tending to maintain said second regulator in its third position, when the effects of the pressures of fluids in said two chambers are equal and opposite said two chambers of said second automatically operable device being connected respectively by pipes to said feed pipes to said front and rear motors, and wherein said third and fourth pipes are connected to said second three-position regulator, a fifth pipe is connected to means for supplying fluid under pressure and a sixth pipe connected to a discharge reservoir are connected to said second three-position regulator, the three positions of said second three-position regulator correspond to the preponderance of the effect of fluid in one or other of said chambers of said second automatically operable means, or with equality of the said effects, and said second three-position regulator connects said third pipe to

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Motor Power Transmission Devices (AREA)
US438378A 1973-02-09 1974-01-31 Control means for public works machine Expired - Lifetime US3905501A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7304754A FR2217487B1 (it) 1973-02-09 1973-02-09

Publications (1)

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US3905501A true US3905501A (en) 1975-09-16

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Application Number Title Priority Date Filing Date
US438378A Expired - Lifetime US3905501A (en) 1973-02-09 1974-01-31 Control means for public works machine

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US (1) US3905501A (it)
JP (1) JPS578251B2 (it)
AR (1) AR201756A1 (it)
BE (1) BE810481A (it)
DE (1) DE2405942A1 (it)
FR (1) FR2217487B1 (it)
GB (1) GB1449961A (it)
IT (1) IT1004900B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225279A (en) * 1977-04-07 1980-09-30 Societe Anonyme Secmafer Airport towing vehicle for handling large transport aircrafts
EP0041199A1 (en) * 1980-05-29 1981-12-09 Sperry Corporation Power transmission
US4776751A (en) * 1987-08-19 1988-10-11 Deere & Company Crowd control system for a loader
US4984989A (en) * 1989-09-07 1991-01-15 Milwaukee School Of Engineering Fluid power demonstration facility
US20050278100A1 (en) * 2004-06-15 2005-12-15 Deere & Company , A Delaware Corporation Crowd control system for a loader
US20110125332A1 (en) * 2009-11-20 2011-05-26 Halliburton Energy Services, Inc. Systems and Methods for Specifying an Operational Parameter for a Pumping System

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61261507A (ja) * 1985-05-15 1986-11-19 株式会社イナックス 吸音構造及び吸音壁構成用ブロツク

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3542228A (en) * 1968-03-08 1970-11-24 Case Co J I Hydrostatic control device for loader tractor
US3583585A (en) * 1969-06-10 1971-06-08 Tyrone Hydraulics Hydraulic control system for a backhoe
US3782572A (en) * 1971-03-22 1974-01-01 Poclain Sa Public works machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3542228A (en) * 1968-03-08 1970-11-24 Case Co J I Hydrostatic control device for loader tractor
US3583585A (en) * 1969-06-10 1971-06-08 Tyrone Hydraulics Hydraulic control system for a backhoe
US3782572A (en) * 1971-03-22 1974-01-01 Poclain Sa Public works machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225279A (en) * 1977-04-07 1980-09-30 Societe Anonyme Secmafer Airport towing vehicle for handling large transport aircrafts
EP0041199A1 (en) * 1980-05-29 1981-12-09 Sperry Corporation Power transmission
US4776751A (en) * 1987-08-19 1988-10-11 Deere & Company Crowd control system for a loader
US4984989A (en) * 1989-09-07 1991-01-15 Milwaukee School Of Engineering Fluid power demonstration facility
US20050278100A1 (en) * 2004-06-15 2005-12-15 Deere & Company , A Delaware Corporation Crowd control system for a loader
US7356397B2 (en) 2004-06-15 2008-04-08 Deere & Company Crowd control system for a loader
US20110125332A1 (en) * 2009-11-20 2011-05-26 Halliburton Energy Services, Inc. Systems and Methods for Specifying an Operational Parameter for a Pumping System
US8543245B2 (en) * 2009-11-20 2013-09-24 Halliburton Energy Services, Inc. Systems and methods for specifying an operational parameter for a pumping system

Also Published As

Publication number Publication date
JPS49112401A (it) 1974-10-26
AR201756A1 (es) 1975-04-15
FR2217487A1 (it) 1974-09-06
BE810481A (fr) 1974-08-01
FR2217487B1 (it) 1975-03-07
GB1449961A (en) 1976-09-15
IT1004900B (it) 1976-07-20
DE2405942A1 (de) 1974-08-15
JPS578251B2 (it) 1982-02-16

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