US3889759A - Hydraulically propelled vehicle - Google Patents

Hydraulically propelled vehicle Download PDF

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Publication number
US3889759A
US3889759A US439528A US43952874A US3889759A US 3889759 A US3889759 A US 3889759A US 439528 A US439528 A US 439528A US 43952874 A US43952874 A US 43952874A US 3889759 A US3889759 A US 3889759A
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United States
Prior art keywords
drum
motor
pump
hydraulic
motors
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
US439528A
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English (en)
Inventor
Roger L Larson
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 Paving Products Inc
Original Assignee
Raygo Inc
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 Raygo Inc filed Critical Raygo Inc
Priority to US439528A priority Critical patent/US3889759A/en
Priority to AU68297/74A priority patent/AU475154B2/en
Priority to CA198,731A priority patent/CA998602A/en
Priority to ES426151A priority patent/ES426151A1/es
Priority to BE144415A priority patent/BE815146A/xx
Priority to BR4511/74A priority patent/BR7404511A/pt
Priority to JP49066601A priority patent/JPS5248406B2/ja
Priority to DE19752502598 priority patent/DE2502598A1/de
Application granted granted Critical
Publication of US3889759A publication Critical patent/US3889759A/en
Assigned to MINNESOTA RASCALS, INC. reassignment MINNESOTA RASCALS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RAYGO, INC., A CORP.OF MINN.
Assigned to RAYGO, INC. reassignment RAYGO, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MINNESOTA RASCALS, INC.
Assigned to RAYGO, INC., A CORP. OF OK reassignment RAYGO, INC., A CORP. OF OK ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RAYGO, INC., A CORP. OF MN
Assigned to CATERPILLAR PAVING PRODUCTS INC. reassignment CATERPILLAR PAVING PRODUCTS INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: RAYGO, INC., A CORP. OF OK
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/44—Control of exclusively fluid gearing hydrostatic with more than one pump or motor in operation
    • F16H61/456—Control of the balance of torque or speed between pumps or motors
    • 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
    • E01C19/26—Rollers therefor; Such rollers usable also for compacting soil self-propelled or fitted to road vehicles
    • E01C19/266—Rollers therefor; Such rollers usable also for compacting soil self-propelled or fitted to road vehicles fitted to vehicles, road-construction or earth-moving machinery, e.g. auxiliary roll readily movable to operative position ; provided with means for facilitating transport; Means for transporting rollers; Arrangements or attachments for converting vehicles into rollers, e.g. rolling sleeves for wheels
    • 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
    • E02F3/78—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices with rotating digging elements
    • 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
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/961—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements with several digging elements or tools mounted on one machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of fluid gearing
    • B60K17/105—Units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles

Definitions

  • ABSTRACT An earthworking machine having front and rear traction means and a hydraulic motor for each.
  • the motors are connected in a closed loop parallel circuit with a pump, and one of them drives its traction means through a plural speed transmission.
  • a first valve mechanism divides pump output fluid equally between the motors.
  • An orifice device in the motorpump circuit allows up to a predetermined small amount of fluid flowing to either motor to be diverted to the other motor.
  • Second valve means in the hydraulic circuit maintains the first valve mechanism effective except at times when the transmission is in other than a low speed working position.
  • Rascal 320A One such compactor that has recently become available is made by RAYGO, INC. of Minneapolis, Minnesota, and is known in the trade as its Rascal 320A. It features a pair of rear traction wheels driven through a two speed transmission by a first reversible hydraulic motor, and a compacting drum mounted on a yoke at the front of the machine for rotation on a generally transverse axis.
  • the drum which is of the same diameter as the wheels, is equipped with vibration producing mechanism and it is rotatably driven by a second reversible hydraulic motor. It thus constitutes the front part of the hydrostatic propulsion means on the machine.
  • Rascal 320-A is provided with a bulldozer blade at its front, ahead of the drum. This enables the machine to move a substantial amount of earth in levelling and scraping operations. for example, and at the same time effect compaction of the earth acted upon by the blade, by the drum behind it.
  • this invention to connect the reversible drum and wheel motors of the machine in a closed loop parallel circuit with a bidirectional pump, and to incorporate an equal flow ratio dividing and combining valve in one side of said circuit, along with an orifice device that makes possible diversion of small portions of the fluid flowing in either branch of the closed loop circuit at one side thereof to the other branch of the circuit at said side thereof, to thus compensate for any change in the effective diameter of the wheels that may occur due to material buildup thereon.
  • Still another object of the invention resides in the provision of a valve device such as described in the preceding paragraph, which is of the electromagnetic type, and which can be actuated to its position cancelling the effect of the divider-combiner valve mechanism as a consequence of shifting of the transmission out of its working speed to a higher speed ratio.
  • FIG. 1 is a diagrammatic view showing the hydrostatically propelled traction means of a compacting machine embodying the principles of this invention.
  • FIG. 2 is a diagram wherein graphic symbols illustrate the hydraulic circuitry for the hydrostatic propulsion means of this invention.
  • the numeral 5 generally designates a vibratory earth compacting machine of the type manufactured by RAYGO, INC. and known as its Rascal 320-A,
  • the machine is characterized by front and rear traction means 6 and 7, respectively; reversible hydraulic motors 8 and 9 drivingly connected with the front and rear traction means, respectively; and a bidirectional piston type pump 10 to supply fluid under pressure to the motors.
  • the pump is driven by an internal combustion engine 11, which may be of the Diesel variety, through a clutch l2 and a drive box 13.
  • the rear traction means 7 is here shown as comprising a pair of laterally spaced wheels 14 carried by an axle structure 15 and driven from the hydraulic motor 9 through a two speed transmission 16.
  • the front traction means 6 comprises a vibratory drum of the same diameter as the wheels, and which is rotatably carried by a yoke having arms indicated at 18, that embrace the opposite ends of the drum. These arms carry the bearings, not shown, in which the drum is rotatably journalled. Hydraulic motor driven vibration producing means is mounted inside the drum.
  • the spacing between the wheels 14 has been exaggerated, as in the actual machine, they are spaced apart a distance less than the axial dimension of the drum 6. Also for purposes of illustration, the multiplicity of tamping feet which project from the exterior of the drum have been omitted.
  • the blade is supported from the yoke arms 18, as by links 21, and it is raised and lowered hydraulically by double acting cylinders, not shown, having one end pivotally mounted on the yoke arms and having piston rods connecting with brackets on the rear of the blade, as indicated at 22.
  • a lever 24 which is accessible to an operator of the machine, enables the transmission 16 to be shifted into low and high speed positions.
  • the low speed position is the one selected for levelling and compacting operations of the machine, while the high speed position allows the machine to be more quickly driven from one work zone to another.
  • the presence of the plural speed transmission 16 causes one of the problems which are solved by this invention.
  • the scraper blade 20 ahead of the vibrator drum causes another.
  • FIG. 2 hydraulic diagram illustrates by means of graphic symbols, that the drum and wheel drive motors 8 and 9, respectively, are connected in a closed loop parallel circuit with the bidirectional pump 10.
  • one of the ports of the drum motor 8 is connected with one of the ports 31 of the wheel drive motor 9, as by means of a duct 32 having a branch 33 connected with one of the work ports 34 of the pump.
  • the ducts 32 and 33 comprise one side of the closed loop parallel pump-motor circuit.
  • the other side of the circuit comprises a duct 36 having its ends connected to the remaining ports 37 and 38 of the motors 8 and 9, respectively, and having a branch 39 connecting with the other work port 40 of the pump.
  • a characteristic of the closed loop parallel circuit thus far described is that pressure fluid from either work port of the pump will flow to whichever hydraulic motor 8 or 9 is more lightly loaded, and will bypass the more heavily loaded motor.
  • the propulsive effort will be dissipated, therefore, whenever the scraper or levelling blade 20 ahead of the compacting drum 6 exerts upward force on the drum sufficient to seriously reduce its tractive relationship to the ground over which the machine is travelling.
  • all of the pump output fluid will flow to the hydraulic motor 8 for the then unloaded compacting drum 6, in bypass relation to the wheel drive motor 9. This produces what is known as drum spin out; and the machine stalls whenever such spin out occurs.
  • valve instrumentality 42 connected in one side of the closed loop hydraulic circuit.
  • the main component of the valve instrumentality 42 comprises an equal ration flow divider-combiner valve mechanism 43. It has a pair of motor ports 44 and 45 which are connected with the ports 37 and 38 of the drum and wheel motors 8 and 9, respectively, by the duct 36. It also has a pump port 47 which is connected with the work port 40 of the pump by the branch 39 of duct 36.
  • the flow divider valve mechanism 43 is of conventional construction and, for example, can be one such as manufactured by Fluid Controls, Inc. and characterized by a pair of pressure compensated plungers, not shown, to regulate flow of fluid in either direction between its pump port 47 and its motor ports 44, 45.
  • the equal ratio flow dividercombiner valve mechanism 43 will function with reasonable accuracy to divide pressure fluid issuing from work port 40 of the pump, for example, into equal volumes for operation of the drum and wheel motors at the desired speeds. Moreover, it will perform this function regardless of whether or not the compactor drum is fully loaded. This is to say that even though the upward force exerted on the drum by the levelling blade may substantially reduce the loading thereof, the rear wheel motor 9 will still receive its share of pump output fluid, and there will be no possibility of drum spin out to interfere with propulsion of the machine.
  • the equal ratio flow dividercombiner valve operates in the same way when the motors 8 and 9 are being driven in the opposite direction by the pump. In that case, however, the flow of return fluid from the motors 8 and 9 to the work port 40 of the pump is controlled by the equal ratio combining action of the valve mechanism 43.
  • the valve instrumentality 42 also features a pressure compensated orifice device 50 which is shown as connected across the ports 37 and 38 of the two motors through the ends of the ducts 36 leading thereto.
  • the orifice device 50 can be said to perform a speed control function in the sense that it acts to automatically compensate for the changing volumetric efficiency of the two motors 8 and 9 due to increase in the rolling radius of the wheels 14 by the build up of material thereon occurring whenever the machine is operated in sticky mud.
  • a scraping device prevents all but an insignificant amount of material build up on the drum.
  • the orifice device is provided primarily because of build up on the rear wheels.
  • the orifice device 50 With the orifice device 50 in one side of the closed loop pump-motor circuit, however, a small amount of the pressure fluid will be allowed to pass between the ducts connecting the pump with the propel motors 8 and 9 at one side of the closed loop parallel circuit. As shown, the orifice device can be connected across the end portions of the duct 36 leading to the motor ports 37 and 38.
  • the orifice device 50 will be caused to open, for example,
  • valve 53 An equally important component in the circuit is a two position electromagnetic valve 53 which. in effect, removes the equal ratio flow divider valve 43 from the circuit any time the transmission 16 is shifted out of its low, or work speed position.
  • the valve 53 is connected across the end portions of the duct 36 at a location between the propel motors (8 and 9) and the equal ratio flow divider 43.
  • valve 53 establishes communication between the ports 37 and 38 of the propel motors. thus permitting supply fluid flowing to those motor ports from the pump, to pass to the motors in whatever proportions are necessary as determined by the ground as a differential.
  • This allows the machine to travel in second or higher speed, and makes possible the use of a plural speed transmission through which driving torque is transmitted to the rear wheels from the wheel propel motor 9.
  • the solenoid valve 53 can be of the normally open type connecting motor ports 37 and 38 as shown, in which case it is actuated to its closed position upon energization of its solenoid 54.
  • Solenoid 54 is in an energizing circuit which includes a switch 55. The switch can be closed to complete the energizing circuit for the solenoid 54 in consequence of actuation of the shift lever 24 to place the transmission in its low speed working position. as indicated in dotted lines in FIG. 2. Any suitable way of effecting such closure of switch 55 will suffice, as for example, a direct link connection 56 between the shift lever 24 and the movable contactor of the switch.
  • said orifice device modifying the fixed ratio aspect of the flow divider-combiner valve mechanism by allowing a predetermined maximum amount of flow to pass between the supply lines leading to the two hydraulic motors to thereby compensate for change in the volumetric efficiency of the motors resulting from an increase in the rolling radius of the traction wheels by buildup of material thereon.
  • valve being closed when the plural speed transmission is in its low speed mode
  • C. means for transmitting rotation to the drum comprising a first reversible fluid motor having a pair of ports;
  • D. means for transmitting rotation to the wheels comprising a second reversible fluid motor having a pair of ports, and plural speed transmission means drivingly connecting the wheels with said second motor;
  • F. means connecting said motors in a closed loop parallel circuit with the pump, comprising a first duct connecting with one of each of the motor ports and having a branch connecting with one of the work 2. an orifice device through which the ports of said ports of the pump, and a second duct connecting one motor are connectible with one another,
  • valve instrumentalities connecting with said first to a second position disrupting said last named duct and comprising communication;
  • an equal ratio flow divider valve having its inlet H. and means to effect actuation ofsaid valve mechaconnected with one pump through said branch of nism to said second position thereof in consesaid first duct, and having a pair of outlets conquence of actuation of the transmission means to nected with the ports of said one motor through 10 a low speed position.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Operation Control Of Excavators (AREA)
  • Road Paving Machines (AREA)
  • Motor Power Transmission Devices (AREA)
  • Control Of Fluid Gearings (AREA)
US439528A 1974-02-04 1974-02-04 Hydraulically propelled vehicle Expired - Lifetime US3889759A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US439528A US3889759A (en) 1974-02-04 1974-02-04 Hydraulically propelled vehicle
AU68297/74A AU475154B2 (en) 1974-02-04 1974-04-26 Hydraulically propelled vehicle
CA198,731A CA998602A (en) 1974-02-04 1974-05-02 Hydraulically propelled vehicle
ES426151A ES426151A1 (es) 1974-02-04 1974-05-09 Perfeccionamientos relativos a maquinas de movimiento de tierras.
BE144415A BE815146A (fr) 1974-02-04 1974-05-16 Engin de compactage des sols vibrant et a propulsion hydrostatique
BR4511/74A BR7404511A (pt) 1974-02-04 1974-05-31 Aperfeicoamentos em maquina de terraplenagem
JP49066601A JPS5248406B2 (enExample) 1974-02-04 1974-06-13
DE19752502598 DE2502598A1 (de) 1974-02-04 1975-01-23 Hydrostatischer fahrantrieb

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US439528A US3889759A (en) 1974-02-04 1974-02-04 Hydraulically propelled vehicle

Publications (1)

Publication Number Publication Date
US3889759A true US3889759A (en) 1975-06-17

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US439528A Expired - Lifetime US3889759A (en) 1974-02-04 1974-02-04 Hydraulically propelled vehicle

Country Status (8)

Country Link
US (1) US3889759A (enExample)
JP (1) JPS5248406B2 (enExample)
AU (1) AU475154B2 (enExample)
BE (1) BE815146A (enExample)
BR (1) BR7404511A (enExample)
CA (1) CA998602A (enExample)
DE (1) DE2502598A1 (enExample)
ES (1) ES426151A1 (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4402377A (en) * 1981-08-31 1983-09-06 Rexworks Inc. Off-road vehicle having wheel slip control
US4448274A (en) * 1979-03-21 1984-05-15 Lely Nv C Van Der Vehicle
US4903780A (en) * 1986-07-11 1990-02-27 Elda Barbieri Mobile, self-propelled crushing machine
US6604601B2 (en) * 2001-10-22 2003-08-12 Biomet-Ross, Inc. Lift truck drive train
US20060156713A1 (en) * 2004-12-01 2006-07-20 George Kadlicko Hydraulic drive system
WO2012006303A1 (en) 2010-07-06 2012-01-12 Jlg Industries, Inc. Selectable flow divider drive system
US20130098022A1 (en) * 2010-06-30 2013-04-25 Volvo Construction Equipment Ab Control device for a hydraulic pump of construction machinery

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5441501A (en) * 1977-09-07 1979-04-02 Kubota Ltd Slewing type working vehicle
AU577961B2 (en) * 1985-08-27 1988-10-06 M.I.M. Holdings Limited Wheel slip control for four wheel drive vehicles
JPS6272306U (enExample) * 1985-10-22 1987-05-09
JPH0535183Y2 (enExample) * 1986-04-08 1993-09-07
CN110876285A (zh) * 2019-12-17 2020-03-13 邵志远 一种切削式梯田开平机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091930A (en) * 1959-08-14 1963-06-04 Dowty Hydraulic Units Ltd Hydraulic apparatus
US3434557A (en) * 1966-04-05 1969-03-25 Anciens Ets Albaret Self-propelled compactor roller
US3435616A (en) * 1966-03-01 1969-04-01 Danfoss As Equalizing system for hydraulic motors
US3480099A (en) * 1967-11-28 1969-11-25 Deere & Co Interlocked change speed and auxiliary hydrostatic front wheel drive motor controls
US3516260A (en) * 1967-09-11 1970-06-23 Bell Telephone Labor Inc Vibrating cable-laying plow
US3605583A (en) * 1969-04-01 1971-09-20 Tampo Mfg Co Inc Vibratory roller compacting apparatus and method
US3641765A (en) * 1969-03-13 1972-02-15 Nat Res Dev Hydrostatic vehicle transmission
US3736732A (en) * 1971-10-12 1973-06-05 Deere & Co Auxiliary drive system for combines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091930A (en) * 1959-08-14 1963-06-04 Dowty Hydraulic Units Ltd Hydraulic apparatus
US3435616A (en) * 1966-03-01 1969-04-01 Danfoss As Equalizing system for hydraulic motors
US3434557A (en) * 1966-04-05 1969-03-25 Anciens Ets Albaret Self-propelled compactor roller
US3516260A (en) * 1967-09-11 1970-06-23 Bell Telephone Labor Inc Vibrating cable-laying plow
US3480099A (en) * 1967-11-28 1969-11-25 Deere & Co Interlocked change speed and auxiliary hydrostatic front wheel drive motor controls
US3641765A (en) * 1969-03-13 1972-02-15 Nat Res Dev Hydrostatic vehicle transmission
US3605583A (en) * 1969-04-01 1971-09-20 Tampo Mfg Co Inc Vibratory roller compacting apparatus and method
US3736732A (en) * 1971-10-12 1973-06-05 Deere & Co Auxiliary drive system for combines

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4448274A (en) * 1979-03-21 1984-05-15 Lely Nv C Van Der Vehicle
US4535859A (en) * 1979-03-21 1985-08-20 Lely Nv C Van Der Vehicle
US4402377A (en) * 1981-08-31 1983-09-06 Rexworks Inc. Off-road vehicle having wheel slip control
US4903780A (en) * 1986-07-11 1990-02-27 Elda Barbieri Mobile, self-propelled crushing machine
US6604601B2 (en) * 2001-10-22 2003-08-12 Biomet-Ross, Inc. Lift truck drive train
US7856817B2 (en) 2004-12-01 2010-12-28 Haldex Hydraulics Corporation Hydraulic drive system
US7516613B2 (en) 2004-12-01 2009-04-14 Haldex Hydraulics Corporation Hydraulic drive system
US20090193801A1 (en) * 2004-12-01 2009-08-06 George Kadlicko Hydraulic drive system
US20060156713A1 (en) * 2004-12-01 2006-07-20 George Kadlicko Hydraulic drive system
US20110061375A1 (en) * 2004-12-01 2011-03-17 George Kadlicko Hydraulic Drive System
US8196397B2 (en) 2004-12-01 2012-06-12 Concentric Rockford, Inc. Hydraulic drive system
US8596055B2 (en) 2004-12-01 2013-12-03 Concentric Rockford Inc. Hydraulic drive system
US20130098022A1 (en) * 2010-06-30 2013-04-25 Volvo Construction Equipment Ab Control device for a hydraulic pump of construction machinery
US9309899B2 (en) * 2010-06-30 2016-04-12 Volvo Construction Equipment Ab Control device for a hydraulic pump of construction machinery
WO2012006303A1 (en) 2010-07-06 2012-01-12 Jlg Industries, Inc. Selectable flow divider drive system
US20130087411A1 (en) * 2010-07-06 2013-04-11 Jlg Industries, Inc. Selectable flow divider drive system
AU2011276337B2 (en) * 2010-07-06 2014-04-24 Jlg Industries, Inc. Selectable flow divider drive system
US10371176B2 (en) * 2010-07-06 2019-08-06 Jlg Industries, Inc. Selectable flow divider drive system

Also Published As

Publication number Publication date
JPS5248406B2 (enExample) 1977-12-09
DE2502598A1 (de) 1975-08-07
BR7404511A (pt) 1976-02-10
AU6829774A (en) 1975-10-30
AU475154B2 (en) 1976-08-12
BE815146A (fr) 1974-09-16
ES426151A1 (es) 1976-07-01
JPS50108709A (enExample) 1975-08-27
CA998602A (en) 1976-10-19

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Legal Events

Date Code Title Description
AS Assignment

Owner name: RAYGO, INC., A CORP. OF OK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RAYGO, INC., A CORP. OF MN;REEL/FRAME:005250/0399

Effective date: 19900130

AS Assignment

Owner name: CATERPILLAR PAVING PRODUCTS INC., 735 FIRST NATION

Free format text: CHANGE OF NAME;ASSIGNOR:RAYGO, INC., A CORP. OF OK;REEL/FRAME:005541/0313

Effective date: 19880331