US3904129A - Hydraulic system for vehicular spreader - Google Patents

Hydraulic system for vehicular spreader Download PDF

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Publication number
US3904129A
US3904129A US506558A US50655874A US3904129A US 3904129 A US3904129 A US 3904129A US 506558 A US506558 A US 506558A US 50655874 A US50655874 A US 50655874A US 3904129 A US3904129 A US 3904129A
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Prior art keywords
control valve
flow control
pump
speed
valve
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Expired - Lifetime
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US506558A
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English (en)
Inventor
Allan L Lorenc
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Highway Equipment Co
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Highway Equipment Co
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Priority to US506558A priority Critical patent/US3904129A/en
Priority to CA229,184A priority patent/CA1019225A/fr
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C17/00—Fertilisers or seeders with centrifugal wheels
    • A01C17/006—Regulating or dosing devices
    • 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
    • E01C19/12—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 distributing granular or liquid materials
    • E01C19/20—Apparatus for distributing, e.g. spreading, granular or pulverulent materials, e.g. sand, gravel, salt, dry binders
    • E01C19/201—Apparatus for distributing, e.g. spreading, granular or pulverulent materials, e.g. sand, gravel, salt, dry binders with driven loosening, discharging or spreading parts, e.g. power-driven, drive derived from road-wheels
    • E01C19/202—Apparatus for distributing, e.g. spreading, granular or pulverulent materials, e.g. sand, gravel, salt, dry binders with driven loosening, discharging or spreading parts, e.g. power-driven, drive derived from road-wheels solely rotating, e.g. discharging and spreading drums
    • E01C19/203—Centrifugal spreaders with substantially vertical axis
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/082—Servomotor systems incorporating electrically operated control means with different modes
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/255—Flow control functions
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7121—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in series
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/0971—Speed responsive valve control
    • Y10T137/0989—Acceleration responsive valve control

Definitions

  • a vehicular spreader has a pressure-compensated flow control valve receiving fluid from a variable displacement pump. Bypass fluid from the valve controls the displacement of the pump.
  • the controlled flow of the valve feeds a manual selector valve having two positions. In one position, the selector valve feeds constant speed spinner motors for dispensing salt or the like. Connected in series with the spinner motors is a rateresponsive differential control valve which controls the speed of the conveyor motor feeding materials to the spinner as a function of ground speed of the vehicle.
  • a feedback signal from the conveyor motor to the differential control valve insures an accurate, quick response even at low speeds.
  • the selector valve permits high-speed operation of the conveyor for pit dumping with the differential control valve closed, or the use of an auxiliary hydraulic device with the differential control valve opened.
  • the present invention relates to hydraulic control systems; and more particularly, it relates to a hydraulic control system for a spreader of the type used to dispense material from a moving vehicle.
  • a hydraulic control system for a spreader of the type used to dispense material from a moving vehicle In a system of this type it is desirable that the amount of material spread over a given area by the vehicle be controlled to give a constant coverage per area, even though the vehicle speed may vary.
  • a large hopper is mounted on a truck, and a conveyor is located beneath the discharge aperture of the hopper for feeding materials to one or more spinners at the rear of the vehicle.
  • the ground speed of the vehicle is sensed, and a signal (either electrical, mechanical or hydraulic) representative of the ground speed is generated and used to actuate a control valve associated with a variable speed motor driving the conveyor. As the vehicle'speeds up, the speed of the conveyor motor is increased, and vice versa.
  • a variable displacement pump is driven by the vehicles engine.
  • the pump feeds a pressure-compensated flow control valve.
  • the bypass fluid from the valve controls the displacement of the pump, and the controlled flow of the valve feeds a manual selector valve having two positions. In one position, the selector valve feeds one or more constant speed spinner motors for dispensing material.
  • a rate-responsive pressure differential control valve which controls the speed of a conveyor motor feeding materials to the spinners.
  • the differential control valve receives one input from a remote speed sensing device generating a mechanical signal representative of vehicle speed, and a second mechanical feedback signal representative of the present speed of the conveyor motor. These two signals, and more particularly the difference between them, controls the positioning of an orifice spool for shunting fluid from the conveyor motor, and thereby decreasing its speed, as the vehicle slows down. Conversely, the position of the orifice spool is controlled to feed more fluid to the conveyor motor as the vehicle speed increases.
  • the feedback control of the differential control valve has been found to insure an accurate response even at low speeds, and the response is quick at all speeds. Further, since the valve has a mechanically controlled variable orifice, control of the conveyor motor is continuous. Still further, the problem of hunting described above has been eliminated as have the problems associated with most spring-biased control valves.
  • the spinner motors are not connected in the hydraulic circuit, and this permits high-speed actuation of the conveyor motor for pit dumping, in which case the differential control valve is capable of being closed manually to render conveyor motor speed independent of vehicle speed. Further, with the manual selection valve in the second position, the system permits use of an auxiliary device, if desired, by opening the differential control valve and using quick disconnects to insert the auxiliary device into the circuit.
  • FIG. 1 is a schematic diagram of a hydraulic system incorporating the present invention
  • FIG. 2 is a schematic diagram similar to FIG. 1, wherein the solid lines indicate fluid flow in using the present system with an auxiliary hydraulic speed control device;
  • FIG. 4 is a view similar to FIG. 1 wherein the solid lines indicate fluid flow for conveyor pit dumping speed control.
  • Reference numeral 11 indicates a variable displacement hydraulic pump having an inlet port 12 receiving fluid from the reservoir 10 and discharging it through an outlet 13.
  • the pump 11 may be a radial piston, variable displacement hydraulic pump manufactured and sold under the designation PR-24, PR-30, PR-40 or PR- Jy John Deere & Company of Moline, Ill.
  • the pump is iriven by a shaft which, in turn, is driven by the Jrime mover of the vehicle on which the system is in- ;talled, although obviously a secondary prime mover :ould be used.
  • Variation of the pump displacement is iccomplished by hydraulic rather than mechanical neans; and for this purpose, a flow control inlet port 17 s provided. As the flow through the flow control inlet )ort 17 increases, the pressure increases to reduce the iisplacement of the pump or destrokes the pump.
  • the output of the pump 11 is fed through a conduit l8 to the inlet of a manually adjustable pressure- :ompensated flow control valve generally designated 20 which includes an outlet port 21 for controlled flow jthat is, a constant flow of fluid depending upon the ietting), a bypass flow port 22, and an inlet port 23. Fluid from the bypass port 22 is fed back to the flow :ontrol input port 17 of the pump 11 by means of a :onduit 24, shown in dashed line.
  • the output of the lalve 20 may be controlled manually, and this is diagrammatically represented by the arrow 27.
  • One such lalve, although the invention is not so limited, is part Io. FC-Sl, sold by Brand Hydraulic, Inc., of Omaha, ⁇ leb.
  • the output of the valve 20 is coupled through a :onduit 28, and the fluid flow through the conduit 28 s substantially constant depending upon the setting of :he valve 20, as manually controlled, preferably by a ever located in the cab of the vehicle on which the syszem is mounted.
  • the combination of the pump 1 l and valve 20, as dis- :losed, is considered an important feature of the invenzion. They cooperate to achieve a controlled flow 1hrough the conduit 28 which is substantially constant et manually variable, and which is quite efficient in :erms of power consumed by the hydraulic system, particularly in view of the fact that the pump 11 is driven )y a variable speed source, namely, the prime mover of :he vehicle. It must be appreciated that the dispensing ate of the material is controlled by the ground speed )f the vehicle, not the engine speed.
  • the conduit 28 is connected to a manual selector 'alve 30 having two positions, designated respectively i1 and 32. V
  • the output 31a of the first position of the selector 'alve 30 is connected by means of a conduit 33 to the input of a pressure-compensated flow divider generally designated by reference numeral 35 and having a first output port 36 and a second output port 37.
  • the output ports 36, 37 are connected respectively to a pair of spinner motors 38, 39, the outputs of which are connected in common to a conduit 40 which feeds the input of a rate-responsive differential control valve 42.
  • the output of the valve 42 is connected by means of a return conduit 43 to the reservoir 10.
  • the output port 32a of the second position of the manual selector valve is connected to the conduit 45 which is provided with a quick disconnect coupling 46 including a first half 46a shown connected to a mating second half 46b whereby the output 32a is connected to the input of the differential control valve 42.
  • a second input control shaft represented by the dashed line 61 is rotated at an angular velocity representative of the speed of a conveyor motor 62.
  • the rotation of the shaft till is a feedback signal representative of the speed of the hydraulic motor driving the conveyor beneath the hopper of the vehicle.
  • the inlet port 57 of the valve 42 is connected to the inlet of the conveyor motor 62, and the outlet port 58 of the valve 42 is connected to the outlet of the conveyor motor 62.
  • the differential control valve 42 is connected hydraulically in parallel with the conveyor motor 62.
  • the shaft 60 rotates at a higher angular velocity, thereby rotating the spool 56 slightly to decrease the orifice of the valve 42 and force more hydraulic fluid to the conveyor motor 62, causing it to increase in speed.
  • the increase in speed of the conveyor motor 62 causes an increase in the rotational velocity of the shaft 61 which, in turn, moves the spool 56 via the feedback connection until equilibrium is established.
  • the system is shown set up in the spinner speed control modethat is, this is the normal mode of dispensing materials at the rear of the vehicle as a function of ground speed.
  • the spinner speed control mode that is, this is the normal mode of dispensing materials at the rear of the vehicle as a function of ground speed.
  • the manual pressure compensated flow control valve is also set by the operator. This valve gives the operator an opportunity to vary the speed of the spinner motors 38, 39, depending upon the type of material being dispensed and the coverage desired. For example, the setting for dispensing fertilizer on a field may be different than that used to spread salt on a highway. In either case, it will be observed that the speed of the vehicle should control the speed of the conveyor motor so as to accomodate changes in vehicular speed while achieving the same spreading rate.
  • the pump 11 pumps fluid through the pressure compensated flow control valve 20, and through the manual selector valve to the conduit 33 which feeds the pressure-compensated flow divider 35.
  • the flow divider 35 feeds equal amount of fluid to the spinner motors 38, 39; and the fluid re-combines and is fed via conduit 40 to the differential control valve 42 and conveyor motor 62, as discussed. From these, the fluid is returned to the reservoir 10 by means of conduit 43.
  • the feedback conduit 24 connecting the bypass flow port 22 of the valve 20 is also connected in circuit with the flow control input port 17 of the pump 11.
  • flow in the conduits 18 and 28 is substantially constant, once set, and independent of the variations in engine speed within the range of the pump.
  • the spinner motors 38, 39 are constant speed motors.
  • the differential flow control valve 42 is regulated in accordance with the ground speed of the vehicle and the feedback signal representative of the speed of the conveyor motor 62, as represented by the shaft 61.
  • the material is dispensed at a predetermined, controlled rate as a function of vehicle ground speed.
  • the manual selector valve 30 is set in the second position 32 wherein the conduit 28 communicates with the outlet port 32a and the conduit 45.
  • the disconnect half 46a is connected to disconnect half 46b to feed the differential control valve 42 directly.
  • the differential control valve 42 is closed manually so that all of the fluid passing through conduit 45 is fed directly to the conveyor motor 62, thereby operating it at top speed.
  • the hydraulic pump 11 and pressure-compensated flow control valve 20 are connected in circuit as previously disclosed.
  • This mode is used, for example, when it is desired to dump the contents of the truck hopper.
  • the truck of course, will be at a stop, so it is not desired that the dumping be accomplished as a function of ground speed, which remains zero.
  • the differential control valve 42 is closed, and the speed of the conveyor motor 62 is controlled by the pressure-compensated flow control valve 20.
  • the system is shown set up for use with an auxiliary hydraulic device, such as a hydraulic-motor-driven charging elevator, if desired, or similar apparatus.
  • the manual selector valve 30 is again in the second position 32, and the pump 11 and pressure compensated flow control valve 20 are connected in circuit as discussed above.
  • the disconnect half 46a is connected to the disconnect half 49, and disconnect half 50 is connected to disconnect half 46b, thereby communicating the auxiliary feed conduit 51 and auxil iary return conduit 52 with the device, and connecting it in circuit with the differential control valve 42 which is automatically opened when the vehicle is stopped or input is deactivated to short-circuit the conveyor motor 62.
  • the apparatus of claim 1 further comprising a seector valve having a first and a second position and :onnected to the controlled flow output of said flow :ontrol valve, the first output thereof communicating with said spinner motor means; a disconnect communi- :ating said manual selector valve in said second posi- IiOl'l directly with said differential flow control valve and said conveyor motor, whereby when said selector lalve is in said second position and said differential lalve is closed, said conveyor motor may be operated at desired speed as controlled by said pressure compen- ;ated flow control valve in a pit dump mode.
  • the apparatus of claim 5 further comprising sec- )nd quick disconnect means adapted to replace said first quick disconnect means to interrupt the fluid cir- :uit for the insertion of an auxiliary hydraulic device, whereby when said differential valve means is open, ;aid auxiliary device may be operated by said pump and ;aid conveyor motor is bypassed.
  • a variable displacement pump having an input flow control port associated with a mechanism for de-stroking said pump as the volume at said inlet flow control port increases; pressurecompensated flow control valve means delivering fluid from said pump at a constant flow rate and including a bypass port; means for communicating said bypass port with said input flow control port of said pump means; means communicating said spinner motor means with the output of said flow control valve; and a differential flow control valve having a spooloperated orifice connected across said conveyor motor, the position of said spool being responsive to a first signal representative of ground speed of the vehicle and a second signal representative of the speed of said conveyor motor.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
US506558A 1974-09-16 1974-09-16 Hydraulic system for vehicular spreader Expired - Lifetime US3904129A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US506558A US3904129A (en) 1974-09-16 1974-09-16 Hydraulic system for vehicular spreader
CA229,184A CA1019225A (fr) 1974-09-16 1975-06-12 Systeme hydraulique pour epandeuse mobile

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US506558A US3904129A (en) 1974-09-16 1974-09-16 Hydraulic system for vehicular spreader

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230280A (en) * 1978-12-11 1980-10-28 Highway Equipment Company Vehicular spreader with digital electronic ground speed link
FR2537381A1 (fr) * 1982-12-10 1984-06-15 Epoke Ks Appareil d'epandage destine a etre monte sur un vehicule
EP0125740A1 (fr) * 1980-11-27 1984-11-21 C. van der Lely N.V. Epandeur
FR2548861A1 (fr) * 1977-05-09 1985-01-18 Lely Nv C Van Der Dispositif pour epandre une matiere granuleuse ou pulverulente sur ou dans le sol
FR2571209A1 (fr) * 1984-10-09 1986-04-11 Lebon Cie Sarl Procede de regulation du debit d'une epandeuse de produit en fonction du grammage, dispositif pour la mise en oeuvre de ce procede et epandeuse pourvue de ce dispositif
EP0282812A2 (fr) * 1987-03-11 1988-09-21 Amazonen-Werke H. Dreyer GmbH & Co. KG Système hydraulique pour entraîner un épandeur
US5584640A (en) * 1994-04-20 1996-12-17 Eaton Corporation Grain tank unloading auger drive means
US5636118A (en) * 1992-11-09 1997-06-03 Lextron, Inc. Method and apparatus for uniform delivery of feed ration along a feedbunk
EP0997064A3 (fr) * 1998-10-30 2000-07-19 Flexi-Coil Ltd. Dispositif de démarrage pour machines de distribution de produits agricoles
FR2798554A1 (fr) * 1999-09-18 2001-03-23 Rauch Landmaschfab Gmbh Dispositif distributeur de produit d'epandage a disques epandeurs et mecanisme agitateur entraines par moteurs hydrauliques
US6508419B1 (en) 1998-09-03 2003-01-21 Turfco Manufacturing, Incorporated Broadcast spreading top dresser
US6817552B2 (en) 2002-02-06 2004-11-16 Turfco Manufacturing, Inc. Broadcast spreading top dresser
US20050242124A1 (en) * 2004-04-28 2005-11-03 Turfco Manufacturing, Inc. Top dresser
US20140076981A1 (en) * 2012-09-14 2014-03-20 Cnh America Llc Motor control system and method for agricultural spreader
US9491902B1 (en) 2013-02-06 2016-11-15 Turfco Manufacturing, Inc. Broadcast spreading top dresser for sand

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US3441039A (en) * 1966-01-17 1969-04-29 Highway Equipment Co Speed control monitor

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US3441039A (en) * 1966-01-17 1969-04-29 Highway Equipment Co Speed control monitor

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548861A1 (fr) * 1977-05-09 1985-01-18 Lely Nv C Van Der Dispositif pour epandre une matiere granuleuse ou pulverulente sur ou dans le sol
US4230280A (en) * 1978-12-11 1980-10-28 Highway Equipment Company Vehicular spreader with digital electronic ground speed link
EP0125740A1 (fr) * 1980-11-27 1984-11-21 C. van der Lely N.V. Epandeur
US5046664A (en) * 1980-11-27 1991-09-10 C. Van Der Lely, N.W. Spreader
FR2537381A1 (fr) * 1982-12-10 1984-06-15 Epoke Ks Appareil d'epandage destine a etre monte sur un vehicule
FR2571209A1 (fr) * 1984-10-09 1986-04-11 Lebon Cie Sarl Procede de regulation du debit d'une epandeuse de produit en fonction du grammage, dispositif pour la mise en oeuvre de ce procede et epandeuse pourvue de ce dispositif
EP0282812A2 (fr) * 1987-03-11 1988-09-21 Amazonen-Werke H. Dreyer GmbH & Co. KG Système hydraulique pour entraîner un épandeur
EP0282812A3 (fr) * 1987-03-11 1988-12-28 Amazonen-Werke H. Dreyer GmbH & Co. KG Système hydraulique pour entraíner un épandeur
US5636118A (en) * 1992-11-09 1997-06-03 Lextron, Inc. Method and apparatus for uniform delivery of feed ration along a feedbunk
US5584640A (en) * 1994-04-20 1996-12-17 Eaton Corporation Grain tank unloading auger drive means
US6508419B1 (en) 1998-09-03 2003-01-21 Turfco Manufacturing, Incorporated Broadcast spreading top dresser
EP0997064A3 (fr) * 1998-10-30 2000-07-19 Flexi-Coil Ltd. Dispositif de démarrage pour machines de distribution de produits agricoles
FR2798554A1 (fr) * 1999-09-18 2001-03-23 Rauch Landmaschfab Gmbh Dispositif distributeur de produit d'epandage a disques epandeurs et mecanisme agitateur entraines par moteurs hydrauliques
US6817552B2 (en) 2002-02-06 2004-11-16 Turfco Manufacturing, Inc. Broadcast spreading top dresser
US20050242124A1 (en) * 2004-04-28 2005-11-03 Turfco Manufacturing, Inc. Top dresser
US20140076981A1 (en) * 2012-09-14 2014-03-20 Cnh America Llc Motor control system and method for agricultural spreader
US9763384B2 (en) * 2012-09-14 2017-09-19 Cnh Industrial America Llc Motor control system and method for agricultural spreader
US9491902B1 (en) 2013-02-06 2016-11-15 Turfco Manufacturing, Inc. Broadcast spreading top dresser for sand

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