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US3741669A - Ground compacting apparatus - Google Patents

Ground compacting apparatus Download PDF

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Publication number
US3741669A
US3741669A US00158862A US3741669DA US3741669A US 3741669 A US3741669 A US 3741669A US 00158862 A US00158862 A US 00158862A US 3741669D A US3741669D A US 3741669DA US 3741669 A US3741669 A US 3741669A
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US
United States
Prior art keywords
roller
shaft
motor
eccentric
drive 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
US00158862A
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English (en)
Inventor
J Harris
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.)
TAMPO Manufacturing CO
Original Assignee
TAMPO Manufacturing CO
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Filing date
Publication date
Application filed by TAMPO Manufacturing CO filed Critical TAMPO Manufacturing CO
Application granted granted Critical
Publication of US3741669A publication Critical patent/US3741669A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
    • E01C19/286—Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll

Definitions

  • a slender elongated Steel drive Shaft extends [58] F leld of Search 94/50, 50 V i one end of the hollow shaft A hydraulic motor i detachably mounted for vibration with the roller and is [56] References C'ted connected by a spline connection to one end portion of UNITED STATES PATENTS the drive shaft. The other end portion of the drive shaft 3,623,407 11/1971 Dresher 94 50 v x is g y connected to an interior Portion of the hollow 2,248,478 7/1941 Mall 94/50 V shaft.
  • vibration is caused by eccentric means within the roller and driven rapidly about the roller axis.,As the eccentric re volves about the roller axis it exerts forces tending to lift the roller from the ground and then to thrust the roller downwardly again against the ground.
  • the present invention is more particularly concerned with drives of the direct type, where much difficulty has been encountered in providing a satisfactory coupling unit for connecting a hydraulic motor to the eccentric shaft. This difficulty stems from some very unusual force and deflection patterns which make stock couplings unsuitable.
  • Deflection of the shaft carrying the eccentric results from the centrifugal force associated with the revolving eccentric.
  • the shaft When the shaft is at rest, it is coaxial with the roller and an end thereof might be coupled directly to a parallel output shaft on a hydraulic drive motor.
  • centrifugal force causes the mid-portion of the shaft to bow outwardly in the direction of the eccentric. This tends to displace the ends of the shaft in opposite directions and also to incline the end portions of the shaft with respect to the axis of the roller, so that misalignment of the motor and the driven eccentric shaft is a normal condition in this harsh environment. Many couplings cannot accommodate such misalignment.
  • the torque criteria also are distinctive.
  • the eccentric drive motors supply about 20 to about 50 horsepower typically, and this energy is dissipated as work in compacting the ground and in lifting the roller for the next compacting stroke.
  • the work input to the system consists of accelerating the eccentric back to the desired speed after it is slowed by extraction of energy in these two parts of the cycle.
  • These speed variations at the shaft should not, however, also exist at the drive motor because such would produce an undesirable torque variation pattern.
  • a large torque increase feeding back to the hydraulic drive motor would raise pressure and cause pulsing of hoses, motor, pump and prime mover.
  • the use of a soft elastomeric coupling for smoothing out the speed variations at the eccentric bearing shaft and minimizing feedback to the drive motor gives rise to overheating difficulties and coupling unit failure.
  • a principal object of the present invention is to overcome the difficulties noted above and to provide a simple but reliable drive for coupling a drive motor to an eccentric shaft of a vibratory compactor.
  • a more particular object of the invention is to directly couple together a hydraulic drive motor and the eccentric shaft of a vibratory roller with a coupling which will maintain chatter-free drive contact areas, will absorb displacements and torque variations, and will not heat up excessively.
  • a flexible, elongated, steel drive shaft for directly coupling an eccentric shaft to a hydraulic drive motor.
  • the eccentric shaft is hollow and is mounted in bearings coaxial with a vibratory roller.
  • the motor is mounted for vibration with the roller and preferably is coaxial therewith adjacent one end of the eccentric shaft.
  • the metal drive shaft is connected at one end to the motor, extends into the adjacent end of the hollow eccentric shaft, and is fastened to an interior portion of the eccentric shaft.
  • the elongated steel drive shaft provides not only sufficient strength to withstand the loads generated in the system but also the flexibility required for accommodating torque variations and eccentric shaft deflections. It is preferred that the main body of the drive shaft be slender as compared with the opening in the hollow eccentric shaft so as to provide an air space surrounding the drive shaft to facilitate the dissipation of heat generated by the twisting of one end of the drive shaft relative to the other in response to cyclical speed variations at the eccentric shaft.
  • FIG. 1 is a schematic plan view of a ground compact ing machine of the self-propelled vibratory roller type embodying the invention.
  • FIG. 2 is a partial cross-sectional view taken generally along the axis of the vibratory roller of the machine of FIG. 1 and illustrating in deta'il the novel eccentric drive of the present invention.
  • a compactor machine is there shown as including a tractor frame 10 and spaced parallel wheels 12 and 14 supporting the frame for ground traversing movement.
  • the wheels are driven by an internal combustion engine 16 acting preferably through a hydrostatic transmission schematically illustrated as including a hydraulic pump 18 and a motor 20.
  • the apparatus 24 includes a frame means 25 mounted for pivotal movements about a vertical axis at pin 22 so that the machine may be steered as the wheels 12 and 14 are driven.
  • the roller support frame 25 resiliently supports a freely rotatable ground contacting roller 26.
  • the roller 26 is provided with an eccentric mass therein for imparting vibratory action and will be hereinafter more fully described with reference to FIG. 2.
  • a hydraulic drive motor 28, for rotating the eccentric means is mounted for vibration with the roller 26 and may be driven by an engine driven pump 30 carried by the tractor frame 10 and coupled to the motor 28 by hose means 32.
  • the roller 26 includes a cylindrical shell 34 which defines the outer ground contacting periphery of the roller 26.
  • Two transversely extending closures 36 support the shell 34 and are disposed at opposite end portions of the shell. These closures are spaced inwardly of the outer edges of the roller shell 34 and are provided with bearing receiving portions 37.
  • the frame means 25 includes portions thereof disposed opposite the ends of the roller 26 and mounting means 40 are interposed between these portions of the frame and the adjacent roller end closures 36.
  • Each of the mounting means 40 includes a suspension beam member 41 connected to the adjacent frame portion by elastomeric bodies 42 which permit the beam member 41 to vibrate relative to the frame.
  • the suspension beam 41 in turn supports the roller 26 for rotation by means of bearings 43 interposed between hub members 47 at the ends of the roller 26 and sleeves 48 fixed in place on the beams 41.
  • the resilient means 42 is provided to absorb much of the shock and to prevent interference between the frame 25 and the roller 26.
  • a hollow shaft 38 carrying an eccentric 45 is supported for rotation within the bearing receiving portions 37 of the roller 26 by means of bearings 46.
  • bearings 46 preferably are of the spherical bearing type, but other suitable types may be used if desired. It can be appreciated that as the shaft means 38 is rotated, the eccentric 45 develops vibratory oscillations in the resiliently mounted, independently rotatable roller 26.
  • the hydraulic eccentric drive motor 23 is received loosely within an opening 49 in the adjacent portion of the frame 25 and is secured to an end portion of the mounting means 40 by bolts 53 screwed into the adjacent sleeve 48, or by any other suitable means.
  • This drive motor 28 is provided with a rotary power output element 50 which is aligned with the central axis of the roller 26 and which protrudes into a central opening in the adjacent roller hub portion 47.
  • the rotary output element 50 of the motor is connected to the eccentric shaft means 38 by a flexible,
  • the drive shaft 54 extends axially through the hub portion 47 of the roller and within the opening 52in the hollow eccentric shaft 38.
  • An enlarged inner end 58 of the drive shaft 54 is secured within the opening 52 by means of a cross pin 56.
  • the steel shaft 54 also maintains a relatively constant driving force on the shaft 38 and the motor 28 by absorbing the torque wind up experienced in vibratory rollers by reason of the fact that energy dissipation occurs primarily over short time intervals while energy input occurs at a substantially constant rate.
  • the present invention is well suited to such patterns because the ends of the elongated steel shaft 54 may twist relative to each other to smooth out the speed variations without generating excessive loads.
  • ground compacting apparatus of the type having a rotatable vibratory roller for contacting the ground to be compacted, eccentric means within said roller, and motor means for driving said eccentric means to vibrate said roller, the improvement comprising:
  • an eccentric support shaft supporting said eccentric means within said roller and having an opening extending axially inwardly from at least one end thereof;
  • a flexible metal drive shaft of smaller cross section than said axial opening in said eccentric support shaft said flexible drive shaft being connected at one end portion thereof to said motor means, extending freely into said axial opening in said eccentric support shaft in spaced relation to the walls of said opening, and being connected at an opposite end portion thereof to said eccentric support shaft.
  • a ground compactor of the vibratory roller type comprising:
  • a hollow shaft carried by said roller for rotation about the axis of said roller, said shaft having an eccentric mass thereon within said roller so that upon rotation of said hollow shaft said mass revolves about the axis of said roller to vibrate said roller relative to the ground,
  • a metal drive shaft rigidly coupled at its ends respectively to said shaft means and said rotary power output element, said drive shaft having a smaller cross section than said opening in said shaft means and extending along said opening in spaced relation to the walls thereof at least as far as said adjacent bearing means for said shaft means and being flexible to absorb deflection and shock loads developed as said shaft means is rotated to move said eccentric mass about the axis thereof.
  • ground compacting apparatus of the type having a ground contacting roller which includes a cylindrical shell and transversely extending closures at opposite end portions of the shell, frame means movable over the surface to be compacted and having portions oppo site the ends of said roller, a mounting unit between each of said frame portions and said roller, means resiliently connecting each of said mounting units to one of said frame portions for vibration relative thereto, means rotatably connecting each of said mounting units to one of said closures .of said roller to permit rotation of said roller relative to said mounting units, shaft means extending generally axially of said roller and having at least one eccentric mass thereon between said closures of said roller, bearing means at opposite end portions off said shaft means for supporting said shaft means within said roller, and an eccentric drive motor carried by one of said mounting units and having a rotary output element directed toward an end of said shaft means, the improvement comprising:
  • a flexible metal drive shaft rigidly connected to said rotary output element of said motor and extending into said opening in spaced relation to the walls of said opening, an inner end portion of said metal drive shaft being rigidly connected to said shaft means at a location between said bearing means for transmitting rotating motion from said motor output element to said shaft means.
  • said bearing means includes a spherical bearing at each end portion of said hollow shaft to permit flexing of said hollow shaft during revolution of said eccentric mass, and wherein said drive shaft flexes to accommodate deflections of said hollow shaft relative to said motor.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
US00158862A 1971-07-01 1971-07-01 Ground compacting apparatus Expired - Lifetime US3741669A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15886271A 1971-07-01 1971-07-01

Publications (1)

Publication Number Publication Date
US3741669A true US3741669A (en) 1973-06-26

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Application Number Title Priority Date Filing Date
US00158862A Expired - Lifetime US3741669A (en) 1971-07-01 1971-07-01 Ground compacting apparatus

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US (1) US3741669A (es)
CA (1) CA952753A (es)
ES (1) ES404349A1 (es)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899263A (en) * 1973-01-10 1975-08-12 Koehring Co Compactor
US4313691A (en) * 1980-05-23 1982-02-02 American Hoist & Derrick Company Lubrication and bearing structure for concentric, independently rotating drum and vibratory shaft
US4340320A (en) * 1980-07-14 1982-07-20 Caterpillar Tractor Co. Drive mechanism
US4389137A (en) * 1980-11-20 1983-06-21 Wacker-Werke Gmbh & Co. Kg Oscillator for soil or road tampers
US5479728A (en) * 1994-03-08 1996-01-02 The Charles Machine Works, Inc. Apparatus for backfilling and tamping a trench
US20090143952A1 (en) * 2007-11-29 2009-06-04 Caterpillar Paving Products Inc. Power management system for compaction vehicles and method
US20100086353A1 (en) * 2008-10-03 2010-04-08 Caterpillar Paving Products, Inc. Compactor with smooth hose routing
US20110255919A1 (en) * 2010-04-16 2011-10-20 Liebherr-Werk Biberach Gmbh Self-Propelled Surface Cutter Having Fixed Support of the Rotary Cutter Drive
CN102251463A (zh) * 2010-04-16 2011-11-23 利勃海尔比伯拉赫有限公司 具有旋转切割器驱动器的固定支撑件的自推进表面切割机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248478A (en) * 1938-07-08 1941-07-08 Mall Arthur William Roller vibrator
US2745326A (en) * 1952-05-17 1956-05-15 George P Green Roller for road machines
US3192839A (en) * 1961-08-17 1965-07-06 Richier Sa Adjustable vibration cylinder, notably for road roller
US3416419A (en) * 1967-08-07 1968-12-17 Hyster Co Tandem roller
US3437019A (en) * 1967-05-31 1969-04-08 Hyster Co Vibratory compactor
US3605583A (en) * 1969-04-01 1971-09-20 Tampo Mfg Co Inc Vibratory roller compacting apparatus and method
US3616730A (en) * 1970-06-29 1971-11-02 American Hoist & Derrick Co Vibratory roller
US3623407A (en) * 1969-11-21 1971-11-30 Ingersoll Rand Co Vibratory compaction roller

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248478A (en) * 1938-07-08 1941-07-08 Mall Arthur William Roller vibrator
US2745326A (en) * 1952-05-17 1956-05-15 George P Green Roller for road machines
US3192839A (en) * 1961-08-17 1965-07-06 Richier Sa Adjustable vibration cylinder, notably for road roller
US3437019A (en) * 1967-05-31 1969-04-08 Hyster Co Vibratory compactor
US3416419A (en) * 1967-08-07 1968-12-17 Hyster Co Tandem roller
US3605583A (en) * 1969-04-01 1971-09-20 Tampo Mfg Co Inc Vibratory roller compacting apparatus and method
US3623407A (en) * 1969-11-21 1971-11-30 Ingersoll Rand Co Vibratory compaction roller
US3616730A (en) * 1970-06-29 1971-11-02 American Hoist & Derrick Co Vibratory roller

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899263A (en) * 1973-01-10 1975-08-12 Koehring Co Compactor
US4313691A (en) * 1980-05-23 1982-02-02 American Hoist & Derrick Company Lubrication and bearing structure for concentric, independently rotating drum and vibratory shaft
US4340320A (en) * 1980-07-14 1982-07-20 Caterpillar Tractor Co. Drive mechanism
US4389137A (en) * 1980-11-20 1983-06-21 Wacker-Werke Gmbh & Co. Kg Oscillator for soil or road tampers
US5479728A (en) * 1994-03-08 1996-01-02 The Charles Machine Works, Inc. Apparatus for backfilling and tamping a trench
CN101474993A (zh) * 2007-11-29 2009-07-08 卡特彼勒铺路产品公司 用于压实车的动力管理系统及方法
US20090143952A1 (en) * 2007-11-29 2009-06-04 Caterpillar Paving Products Inc. Power management system for compaction vehicles and method
US8374766B2 (en) * 2007-11-29 2013-02-12 Caterpillar Paving Products Inc. Power management system for compaction vehicles and method
CN101474993B (zh) * 2007-11-29 2013-09-18 卡特彼勒铺路产品公司 用于压实车的动力管理系统及方法
US20100086353A1 (en) * 2008-10-03 2010-04-08 Caterpillar Paving Products, Inc. Compactor with smooth hose routing
US8376655B2 (en) * 2008-10-03 2013-02-19 Caterpillar Paving Products Inc. Compactor with smooth hose routing
US20110255919A1 (en) * 2010-04-16 2011-10-20 Liebherr-Werk Biberach Gmbh Self-Propelled Surface Cutter Having Fixed Support of the Rotary Cutter Drive
CN102251463A (zh) * 2010-04-16 2011-11-23 利勃海尔比伯拉赫有限公司 具有旋转切割器驱动器的固定支撑件的自推进表面切割机
CN102251463B (zh) * 2010-04-16 2015-12-02 利勃海尔传动部件比伯拉赫有限公司 具有旋转切割器驱动器的固定支撑件的自推进表面切割机

Also Published As

Publication number Publication date
CA952753A (en) 1974-08-13
ES404349A1 (es) 1975-06-01

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