US3803925A - Rack and pinion swing actuator for a backhoe - Google Patents

Rack and pinion swing actuator for a backhoe Download PDF

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Publication number
US3803925A
US3803925A US00280587A US28058772A US3803925A US 3803925 A US3803925 A US 3803925A US 00280587 A US00280587 A US 00280587A US 28058772 A US28058772 A US 28058772A US 3803925 A US3803925 A US 3803925A
Authority
US
United States
Prior art keywords
bracket
housing
shaft
pinion
reaction shaft
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
US00280587A
Other languages
English (en)
Inventor
J Jackson
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor 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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to US00280587A priority Critical patent/US3803925A/en
Priority to JP48069712A priority patent/JPS5743700B2/ja
Priority to CA175,760A priority patent/CA976384A/en
Priority to GB3543673A priority patent/GB1395847A/en
Priority to BE134570A priority patent/BE803601A/xx
Application granted granted Critical
Publication of US3803925A publication Critical patent/US3803925A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type
    • 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
    • E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
    • E02F3/382—Connections to the frame; Supports for booms or arms
    • E02F3/384—Connections to the frame; Supports for booms or arms the boom being pivotable relative to the frame about a vertical axis
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/188—Reciprocating or oscillating to or from alternating rotary including spur gear
    • Y10T74/18808—Reciprocating or oscillating to or from alternating rotary including spur gear with rack

Definitions

  • ABSTRACT There is disclosed a backhoe having a readily removable swing actuator.
  • the swing actuator comprises a reaction shaft receivable in a socket on a swing sup- 5 Claims, 4 Drawing Figures .--'MENTEBAPR 16 1914 V 13,803; 925
  • the present invention relates to backhoes and pertains more particularly to a readily removable swing actuator for a backhoe.
  • Backhoes are normally mounted on a transversely supported frame attached to the rear of a tractor or similar vehicle, and have a boom swing frame pivotally mounted to the support frame for swinging movement about a vertically disposed pivot axis.
  • a hydraulic motor is normally secured to the frame and coupled to the boom for swinging it about the pivotal axis.
  • Various types of hydraulic motors and drives are employed for such application.
  • One desirable form of such actuator comprises a linear hydraulic motor with a rack and pinion drive for transmitting the driving force to the boom.
  • Known actuators of this type are generally built into the support frame, and are such an integral part of the support structure that the entire boom support structure must often be removed in order to remove or repair the swing actuator. This requires that the backhoe be transported to a shop that is equipped to perform this work. Such action and the manner of construction result in considerable down time in order to effect such repair or replacement. This results in such repair being extremely time consuming as well as expensive.
  • a swing actuator of the rack and pinion type which is built into the support structure is exemplified by U.S. Pat. No. 2,980,401, issued Oct. 13, 1959 to H].
  • Anothertype of swing actuator having a readily detachable swing motor is illustrated or disclosed in U.S. Pat. No. 2,978,116, issued Apr. 4, 1961 to BL.
  • Wells et al. This Wells patent illustrates one approach to solving the problem of expensive down time, should the hydraulic swing actuator fail.
  • Another object of the present invention is to provide a rack and pinion type swing actuator for a backhoe with novel coupling meansto permit ready attachment and detachment to a backhoe without the necessity for disassembly.
  • a further object of the present invention is to provide a novel rack and pinion swing actuator and coupling means for detachably coupling the actuator for swing actuation of a backhoe.
  • a rack and pinion type swing actuator having a reaction shaft about which the actuator swings to actuate or swing the backhoe linkage.
  • the reaction shaft is slidably received in a socket on the swing actuator support wherein the reaction shaft is held in non-rotatable position.
  • the reaction shaft holding socket is built into the stationary support frame for the backhoe, and permits removal and replacement of the actuator without disturbing the relationship of any of the other components of the backhoe assembly.
  • Simple coupling means attaches or couples the swing housing to the boom swing frame of the backhoe to transmit torque thereto.
  • FIG. 1 is a side elevational view of a backhoe embodying the principles of the present invention
  • FIG. 2 is a detailed elevational view of a pivotal support in combination with a swing actuator in accordance with the present invention
  • FIG. 3 is a sectional view, taken generally along lines IIIIII of FIG. 4;
  • FIG. 4 is a top view, with portions broken away, of the swing actuator in accordance with the present invention.
  • FIG. 1 there is illustrated a swing actuator generally designated by the numeral 10, operatively connected between a swing frame I2 and a stationary support frame 14 of a backhoe, generally designated by the numeral 16.
  • the stationary support frame 14 is secured in a suitable manner to' the back end of a suitable vehicle such as a tractor or loader 18.
  • the swing frame or support 12 is pivotally supported to the stationary frame 14 for pivotal movement about a vertical axis, and supports the bucket linkage comprising a boom 20 and a stick 22, to which is pivotally supported a suitable bucket 24.
  • These linkages are all manipulated by the usual hydraulic rams as illustrated.
  • the frames 12 and 14, as best seen in FIG. 2, arepivotally connected together by means of upper and lower brackets.
  • the lower bracket generally comprises a rearward extending bracket member 26 received between the arms of a bifurcated bracket 28 and pivotally connected together by means of a pivot pin 30.
  • the upper bracket comprises bifurcated member or bracket 32, extending rearwardly from stationary support member 14, and receiving the bracket member 34 extending forward from the swing frame 12.
  • the bracket mem bers are pivotally connected together by means of a hollow pin or sleeve 36.
  • the sleeve 36 extends through bores 38 of the bifurcated member 32 and journals bracket member 34 thereto by means of suitable bearing means 40.
  • the sleeve 36 is formed with an internal spline 42, and is non-rotatably secured to the bifurcated bracket member 32 by means of a flange 44 having a stub shaft 46 with splines projecting into the spline bore 42 of the sleeve 36.
  • the flange 44 is non-rotatably secured to the bracket 32 by suitable means such as bolts 48 and dowels or pins 50.
  • the sleeve 36, together with flange 44 define a socket for receiving and non-rotatably supporting a reaction shaft to be described.
  • FIGS. 3 and 4 there is illustrated a preferred embodiment of the swing actuator of the present invention, comprising generally a housing 52 having a removable cover 54 secured thereto in a suitable manner such as by screws or bolts 56.
  • a reaction shaft 58 is rotatably mounted in the housing 52 such as by suitable bearing means 60 and 62, and has suitable seal means 64.
  • the reaction shaft 58 includes splines 66 extending into and engaging splines 42 of sleeve 36, so as to nonrotatably secure the shaft 58 with respect to the stationary frame and bracket members 32.
  • a pinion gear 68 is non-rotatably secured in a suitable manner to the reaction shaft 58 and is drivingly engaged by a reciprocable rack member 70.
  • the rack 70 is formed between a pair of pistons, only one of which is shown at 72, and which are reciprocally mounted in cylinders 74 and 76, which are coaxially disposed in opposed relationship and suitably secured such as by means of bolts 78 and 80 to the housing 52.
  • Suitable inlet ports 82 and 84 are provided for the introduction of pressurized fluid into the cylinders 74 and 76 for operation of the pistons 72.
  • the housing 52 is provided with suitable brackets 86 and 88, extending outward therefrom and operatively connected such as by means of bolts 90 and 92 to the swing frame 12.
  • This bracket means provides appropriate means for operatively connecting the swing actuator to the swing frame 12 for transmitting torque or force thereto for swinging the frame about its pivot point or pivot mountings.
  • the swing actuator unit may be completely removed simply by removing bolts 90 and 92 and lifting the housing 52 upward to remove reaction shaft 58 from the socket defined by the central bore of the sleeve 36.
  • the removal of the actuating unit in no way affects the support by means of the pivot brackets of the support or swing frame 12.
  • a pivotal support bracket assembly for pivotally supporting a backhoe boom for swinging movement about a vertical axis, said assembly comprising:
  • a linear actuator mounted in said housing and drivingly connected to said shaft;
  • a stub shaft having splines formed thereon for engaging said splines in said sleeve
  • a detachable swing actuator assembly for a backhoe and the like comprising:
  • a vertically oriented swivel mount comprising a fixed bifurcated first bracket comprising upper and lower spaced members having a vertically oriented cylindrical bore formed therein;
  • a hollow pin having internal splines formed therein mounted in said bore and pivotally mounting a second bracket member to said first bracket;
  • a swing actuator comprising a housing, a reaction shaft including a pinion rotatably mounted in said housing and a linear hydraulic actuator including a rack drivingly connected to said reaction shaft;
  • reaction shaft having a splined portion extending into and non-rotatably connected by cooperative engagement of said splines to said hollow pin;
  • a swing drive actuator for a backhoe comprising:
  • a bracket for pivotally supporting a boom for swinging movement about a vertical axis
  • said bracket including means defining a nonrotatable socket
  • a linear hydraulic motor attached to said housing and including a rack drivingly connecting said hydraulic motor to said pinion;
  • a swing drive actuator for a backhoe comprising:
  • bracket for pivotally supporting a boom for swinging movement about a vertical axis; said bracket including a pin having an axial bore defining a non-rotatable socket having splines formed therein;
  • a linear hydraulic motor attached to said housing and including a rack drivingly connecting said hydraulic motor to said pinion;
  • a swing drive actuator for a backhoe comprising:
  • said bracket including a pin having an axial bore defining a non-rotatable socking having splines formed therein;
  • said pin comprises a pivotal support for said bracket

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)
  • Transmission Devices (AREA)
  • Shovels (AREA)
  • Actuator (AREA)
US00280587A 1972-08-14 1972-08-14 Rack and pinion swing actuator for a backhoe Expired - Lifetime US3803925A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00280587A US3803925A (en) 1972-08-14 1972-08-14 Rack and pinion swing actuator for a backhoe
JP48069712A JPS5743700B2 (enrdf_load_stackoverflow) 1972-08-14 1973-06-20
CA175,760A CA976384A (en) 1972-08-14 1973-07-05 Rack and pinion swing actuator for a backhoe
GB3543673A GB1395847A (en) 1972-08-14 1973-07-25 Rack and pinion swing actuators for backhoes or the like of earth moving vehicles
BE134570A BE803601A (fr) 1972-08-14 1973-08-14 Dispositif a cremaillere et a pignon pour commander le pivotement d'une chargeuse-pelleteuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00280587A US3803925A (en) 1972-08-14 1972-08-14 Rack and pinion swing actuator for a backhoe

Publications (1)

Publication Number Publication Date
US3803925A true US3803925A (en) 1974-04-16

Family

ID=23073726

Family Applications (1)

Application Number Title Priority Date Filing Date
US00280587A Expired - Lifetime US3803925A (en) 1972-08-14 1972-08-14 Rack and pinion swing actuator for a backhoe

Country Status (5)

Country Link
US (1) US3803925A (enrdf_load_stackoverflow)
JP (1) JPS5743700B2 (enrdf_load_stackoverflow)
BE (1) BE803601A (enrdf_load_stackoverflow)
CA (1) CA976384A (enrdf_load_stackoverflow)
GB (1) GB1395847A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929239A (en) * 1974-04-25 1975-12-30 Case Co J I Backhoe actuator
US3954196A (en) * 1974-10-15 1976-05-04 The Warner & Swasey Company Material handling apparatus
US4249842A (en) * 1978-09-28 1981-02-10 Johnson Howard L Self loading multiple bale trailer
US5323690A (en) * 1993-03-05 1994-06-28 Sims James O Fluid actuator assembly for imparting rotational movement to a boom

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6197783U (enrdf_load_stackoverflow) * 1984-11-30 1986-06-23
JPS62152298A (ja) * 1985-12-26 1987-07-07 Matsushita Electric Ind Co Ltd 超音波ホ−ン

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978116A (en) * 1957-11-25 1961-04-04 Massey Ferguson Inc Swivel post and power oscillator assembly
US3040717A (en) * 1958-09-08 1962-06-26 Houdaille Industries Inc Piston-rack rotary actuator
US3165842A (en) * 1962-07-26 1965-01-19 Wain Roy Corp Mechanism for attaching implements to vehicles
US3278046A (en) * 1964-06-05 1966-10-11 Case Co J I Backhoe support
US3436849A (en) * 1965-12-20 1969-04-08 Freddie J Haynes Back hoe apparatus having movable teeth
US3493135A (en) * 1968-03-08 1970-02-03 Bucyrus Erie Co Braked ball and socket support for bucket attachment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978116A (en) * 1957-11-25 1961-04-04 Massey Ferguson Inc Swivel post and power oscillator assembly
US3040717A (en) * 1958-09-08 1962-06-26 Houdaille Industries Inc Piston-rack rotary actuator
US3165842A (en) * 1962-07-26 1965-01-19 Wain Roy Corp Mechanism for attaching implements to vehicles
US3278046A (en) * 1964-06-05 1966-10-11 Case Co J I Backhoe support
US3436849A (en) * 1965-12-20 1969-04-08 Freddie J Haynes Back hoe apparatus having movable teeth
US3493135A (en) * 1968-03-08 1970-02-03 Bucyrus Erie Co Braked ball and socket support for bucket attachment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929239A (en) * 1974-04-25 1975-12-30 Case Co J I Backhoe actuator
US3954196A (en) * 1974-10-15 1976-05-04 The Warner & Swasey Company Material handling apparatus
US4249842A (en) * 1978-09-28 1981-02-10 Johnson Howard L Self loading multiple bale trailer
US5323690A (en) * 1993-03-05 1994-06-28 Sims James O Fluid actuator assembly for imparting rotational movement to a boom

Also Published As

Publication number Publication date
BE803601A (fr) 1974-02-14
JPS4958266A (enrdf_load_stackoverflow) 1974-06-06
JPS5743700B2 (enrdf_load_stackoverflow) 1982-09-16
GB1395847A (en) 1975-05-29
CA976384A (en) 1975-10-21

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STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)

AS Assignment

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515