US3156156A - Hydraulic lifting devices of tractors - Google Patents

Hydraulic lifting devices of tractors Download PDF

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Publication number
US3156156A
US3156156A US832814A US83281459A US3156156A US 3156156 A US3156156 A US 3156156A US 832814 A US832814 A US 832814A US 83281459 A US83281459 A US 83281459A US 3156156 A US3156156 A US 3156156A
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United States
Prior art keywords
valve
fluid
ram
hitch
pilot valve
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
US832814A
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English (en)
Inventor
Peras Lucien
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.)
Renault SA
Original Assignee
Renault SA
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Filing date
Publication date
Priority claimed from FR774018A external-priority patent/FR1222459A/fr
Application filed by Renault SA filed Critical Renault SA
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Publication of US3156156A publication Critical patent/US3156156A/en
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Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
    • A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
    • A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
    • A01B63/111—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements
    • A01B63/114—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements to achieve a constant working depth
    • A01B63/1145—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements to achieve a constant working depth for controlling weight transfer between implements and tractor wheels
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
    • A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
    • A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
    • A01B63/1006—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means the hydraulic or pneumatic means structurally belonging to the tractor
    • A01B63/1013—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means the hydraulic or pneumatic means structurally belonging to the tractor and being located inside the tractor body
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
    • A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
    • A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
    • A01B63/111—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements

Definitions

  • the essential object of this invention is to provide a device of this character which constitutes a simple and reliable system of maintaining at a constant preselected level the points where the farming equipments are coupled to the drawing rods or arms irrespective of the movements and stress applied by the ground surface to the towed equipment.
  • this device constitutes a practical and simple means whereby one or more auxiliary hydraulic cylinders, jacks, or rams can be fed with fluid under pressure.
  • FIGURE 1 is a diagrammatic elevational and sectional view showing the essential component elements of the device of this invention shown in its stabilized position with the hydraulic circuit by-passed;
  • FIGURE 2 is a similar view of the device showing its operation when the control lever is moved to its position demanding the lifting of the drawing arm;
  • FIGURE 3 is a similar view showing the operation of the device when the control lever is moved to its position demanding the lowering of the lifting arm;
  • FIGURE 4 is a similar view showing the operation of the so-called modulation device when it is desired to transfer one fraction of the coupled equipment to the tractor;
  • FIGURE 5 is similar view showing the operation of the device when it is desired to supply fluid under pressure to auxiliary hydraulic cylinders, jacks or rams.
  • the hydraulic lifting device of this invention comprises a fluidfilled sump 1 having immersed therein the inlet end of the pipe 2 for supplying the hydraulic circuit with fluid forced therethrough by a pump 3 driven from the tractor through means not shown, this hydraulic circuit being adapted, through a distributor designated as a whole by the reference numeral 4, to supply fluid under pressure to a single-acting lifting cylinder 5 having its piston 6 connected through a connecting-rod 7 to a bell-crank lever fulcrumed on a pin 3 and having a rear arm 9 constituting the arm for lifting the equipment (not shown) coupled to the tractor.
  • the distributor 4 comprises a control slide or pilot valve 10 connected in the known manner through linkage means 11 both to the lifting arm 9 and to the control lever 12 whereby the operator may control at will the upward and downward movements of this arm 9.
  • the slide valve ll) constitutes a double piston and the piston body lll controls the passage of derivated fluid which takes place in this example through a groove or exhaust port 13 formed in the wall of the slide-valve cylinder at the outlet end of a chamber 14 branched off the distribution circuit and supplied with fluid under pressure through a throttled passage 15.
  • the pressure developing in this chamber 14- when the passage 13 is closed is available for actuating through the medium of a piston 16 a by-pass valve 17.
  • Outlet valve 18 Downstream of by-pass Valve 17 is an outlet valve 18 also constituting under normal conditions of operation a non-return valve in relation to the lifting cylinder 5 fed through the pipe line 19.
  • this valve 13 can be kept positively open by means of a push-member 26 adapted to be actuated by the other piston body 10 of the slide-valve which, in this case, will act as a cam controlling this outlet valve.
  • a nozzle adjustable by means of a needle or metering valve 2 1 downstream of the outlet valve 13 is a nozzle adjustable by means of a needle or metering valve 2 1, and downstream of this nozzle is a branch pipe 22 connecting the circuit feed line 2 to the outlet pipe I? loading to a servo-cylinder 5, a non-return valve 23 being interposed therein.
  • a valve 24 mounted in the feed line 2, after the branch pipe 22 and before the distributor is a valve 24 whereby the cross-sectional area available for the passage of the fluid may be modified at will within limits corresponding to the function to be set forth presently in the part of the description dealing with the operation of the device.
  • a relief valve 25' provided in this example, for the sake of safety, with a control rod 26 adapted to be actuated by the movable member 6 of cylinder 5 when the maximum lifting position not to be overstepped is attained.
  • a three-way cock 27 in pipe 1? adapted, when. it is desired to feed auxiliary cylinders, to isolate the lifting cylinder and to connect the circuit of these auxiliary cylinders through a branch pipe 29.
  • This lifting device operates as follows:
  • the arm 9 causes the slide valve 10 to resume its initial position; to do this, the arm 9 engages the linkage 11 bearing now on the control lever 12 locked in a given position.
  • the circuit is by-passed as already described, and the lifting arm 9 is held in a stable position since the valves 18 and 23 will then prevent any fluid from flowing back from the cylinder 5.
  • a moderate flow takes place through the throttle orifice 15, and the dimension of this orifice is so selected as to avoid any unduly long lifting time for the highest possible fluidity of the hydraulic medium.
  • FIG. 3 The operation obtaining in case of a demand for a lowering movement from the upper position of the lifting arm is shown in FIG. 3.
  • the slide valve 10 By moving the control lever 12 forwards, the slide valve 10 will move to the rear as shown in the drawing.
  • the passage 13 is not open in the direction of the sump, the by-pass valve 17 remains open and the piston body 10 causes the valve 18 to open by engaging the push member 20.
  • the fluid hitherto trapped by this valve for maintaining the lifting arm in the requisite position is then forced to the sump through the by-pass valve as indicated by the arrows but must pass through the nozzle 21 controlled by the adjustable needle valve, the latter having actually the function of permitting the adjustment of the arm-lowering movement.
  • the lifting arm restores the slide valve 10 to its initial position and the downward movement is discontinued when the piston body 10 allows the push-member r to re-close the valve 18, whereafter the circuit remains only in its by-pass condition.
  • FIG. 4 illustrates the so-called modulation operation obtaining when, for the reason already set forth, it is desired to transfer to the rear axle of the tractor one fraction of the weight of the machine coupled thereto.
  • valve 24 is actuated with a view to reduce the cross-sectional area available for the passage of fluid, the fluid pressure in the circuit portion located upstream of this valve will be increased and transmitted to the lifting cylinder as a consequence of the opening of valve 23.
  • this modulating valve 24 The reduction in the cross-sectional area which is caused by this modulating valve 24 is so determined that the increased fluid pressure which can thus be applied to the lifting cylinder will not exceed that resulting from the weight of the equipment coupled to the tractor. Consequently, upon actuating this valve, this equipment will be relieved since one fraction of its weight will be transferred to the driving wheels of the tractor, as required, but without being raised.
  • This valve is to be operated only temporarily and therefore a return member will be associated therewith to urge the valve to its normal through-flow position (full cross-sectional area of its passage).
  • FIG. 5 The operation of the arrangement for supplying pressurized fluid to auxiliary cylinders is illustrated in FIG. 5.
  • the three-way cock 27 is set in the proper position for isolating the main cylinder circuit in any desired position of the lifting arm 9, while connecting the pressure side of the circuit to the pipe 28 for supplying fluid under pressure to the auxiliary cylinder or cylinders, for example a ram or hydraulic jack.
  • control lever 12 Since after the actuation of the cock 27, the circuit remains in its by-pass condition, the control lever 12 must then be operated in the proper direction to raise the arm 9, as shown in the figure, in order to eliminate the by-pass flow of fluid by displacing the slide valve 10 forwards with a view to cause a forced feeding of the device connected to the pipe line 28.
  • the stabilization position for example when a hydraulic lifting cylinder is operated, is obtained by restoring manually the control lever 12 to its initial position causing the by-passing of the hydraulic circuit due to the movement of the slide valve to the corresponding position.
  • the operation in the arm-lowering direction is obtained in the same manner as that described, by moving the control lever 12 forwards in relation to its by-pass setting position indicating the position in which the lifting arm has been retained.
  • a tractor having a hitch for connecting an implement thereto and a hydraulic control system having a manual control lever for controlling said system for raising and lowering the hitch
  • said system including a fluid ram connected to the hitch, a fluid circuit comprising a pump, a reservoir, and a distributor comprising a pilot valve having a neutral position and operable from said neutral position in opposite directions to extreme operative positions for controlling the action of said fluid on said fluid ram, means defining two parallel flow paths in said fluid circuit connecting said pump with said fluid ram, one of said flow paths being connected between said pump and fluid ram and including a first non-return valve, a second flow-path of said two flow-paths connected to said one flow path upstream of said first non-return valve and downstream thereof comprising a throttle valve and a second non-return valve biased to a closed position and serially connected with said throttle valve, a by-pass valve biased to a closed position and in communication with said second flow path upstream of said second non-return valve to bypass the fluid to said
  • a tractor having a hitch for connecting an implement thereto and a hydraulic control system having a manual control lever for controlling said system for raising and lowering the hitch
  • said system including a fluid ram connected to the hitch, a fluid circuit comprising a pump, a reservoir, and a distributor comprising a pilot valve having a neutral position and operable from said neutral position in opposite directions to extreme operative positions for controlling the action of said fluid on said fluid ram, means defining two parallel flow paths in said fluid circuit connecting said pump with said fluid ram, one of said flow paths being connected between said pump and fluid ram and including a first non-return valve, a second flow-path of said two flow-paths connected to said one flow path upstream of said first non-return valve and downstream thereof comprising a throttle valve and a second non-return valve biased to a closed position and serially connected with said throttle valve, a by-pass valve biased to a closed position and in communication with said second flow path upstream of said second non-return valve to bypass the fluid to said
  • a tractor having a hitch for connecting an implement thereto and a hydraulic control system having a manual control lever for controlling said system for rais ing and lowering the hitch
  • said system including a fluid ram connected to the hitch, a fluid circuit comprising a pump, a reservoir, and a distributor comprising a pilot valve having a neutral position and operable from said neutral position in opposite directions to extreme operative positions for controlling the action of said fluid on said fluid ram, means defining two parallel flow paths in said fluid circuit connecting said pump with said fluid ram, one of said flow paths being connected between said pump and fluid ram and including a first non-return valve, a second flow-path of said two flow-paths connected to said one flow path upstream of said first non-return valve and downstream thereof comprising a throttle valve and a second non-return valve biased to a closed position and serially connected with said throttle valve, a bypass valve biased to a closed position and in communication with said second flow path upstream of said second non-return valve to bypass the fluid to
  • a tractor having a hitch for connecting an implcment thereto and a hydraulic control system having a manual control lever for controlling said system for raising and lowering the hitch
  • said system including a fluid ram connected to the hitch, a fluid circuit comprising a pump, a reservoir, and a distributor comprising a pilot valve having a neutral position and operable from said neutral position in opposite directions to extreme operative positions for controlling the action of said fluid on said fluid ram, means defining two parallel flow paths in said fluid circuit connecting said pump with said fluid ram, one of said flow paths being connected between said pump and fluid ram and including a first non-return valve, a second flow-path of said two flow-paths connected to said one flow path upstream of said first nonreturn valve and downstream thereof comprising a throttle valve and a second non-return valve biased to a closed position and serially connected with said throttle valve, a by-pass valve biased to a closed position and in communication with said second flow path upstream of said second non-return valve to bypass the fluid
  • a tractor having a hitch for connecting an implement thereto and a hydraulic control system having a manual control lever for controlling said system for raising and lowering the hitch
  • said system including a fluid ram connected to the hitch, a fluid circuit comprising a pump, a reservoir, and a distributor comprising a pilot valve having a neutral position and operable from said neutral position in opposite directions to extreme operative positions for controlling the action of said fluid on said fluid ram, means defining two parallel flow paths in said fluid circuit connecting said pump with said fluid ram, one of said flow paths being connected between said pump and fluid ram and including a first non-return valve, a second flow-path of said two flowpaths connected to said one flow path upstream of said first non-return valve and downstream thereof comprising a throttle valve and a second non-return valve biased to a closed position and serially connected with said throttle valve, a metering valve in said second flow-path downstream of said second non-return valve, a by-pass valve biased to a closed position and in communication

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
US832814A 1958-09-08 1959-08-10 Hydraulic lifting devices of tractors Expired - Lifetime US3156156A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR774018A FR1222459A (fr) 1958-09-08 1958-09-08 Dispositif de relevage hydraulique pour tracteurs
FR813982 1959-12-23

Publications (1)

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US3156156A true US3156156A (en) 1964-11-10

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US832814A Expired - Lifetime US3156156A (en) 1958-09-08 1959-08-10 Hydraulic lifting devices of tractors

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US (1) US3156156A (fr)
FR (1) FR76796E (fr)
GB (1) GB927176A (fr)
OA (1) OA01448A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239012A (en) * 1960-08-26 1966-03-08 Massey Ferguson Inc Hydraulic power unit and control system for tractors
US4183287A (en) * 1975-02-22 1980-01-15 Kubota Tekko Co., Ltd. Hydraulic control apparatus for tractor
EP1795061A4 (fr) * 2004-08-24 2008-07-16 Yanmar Co Ltd Structure d'élévateur hydraulique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1325023A (fr) * 1962-03-14 1963-04-26 Siderurgie Fse Inst Rech Procédé de régulation pour captage sans combustion des gaz provenant de l'affinage pneumatique des fontes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2375946A (en) * 1942-07-08 1945-05-15 Western Electric Co Control system
US2477710A (en) * 1945-10-15 1949-08-02 Deere & Co Pressure fluid follow-up servomotor
US2482249A (en) * 1944-11-01 1949-09-20 Deere & Co Hydraulic mechanism
US2538143A (en) * 1943-02-01 1951-01-16 Deere & Co Power lift
US2847030A (en) * 1955-01-03 1958-08-12 Ford Motor Co Valve means for tractor hydraulic system
US2851938A (en) * 1956-05-28 1958-09-16 Deere Mfg Co Tractor hydraulic power lift control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2375946A (en) * 1942-07-08 1945-05-15 Western Electric Co Control system
US2538143A (en) * 1943-02-01 1951-01-16 Deere & Co Power lift
US2482249A (en) * 1944-11-01 1949-09-20 Deere & Co Hydraulic mechanism
US2477710A (en) * 1945-10-15 1949-08-02 Deere & Co Pressure fluid follow-up servomotor
US2847030A (en) * 1955-01-03 1958-08-12 Ford Motor Co Valve means for tractor hydraulic system
US2851938A (en) * 1956-05-28 1958-09-16 Deere Mfg Co Tractor hydraulic power lift control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239012A (en) * 1960-08-26 1966-03-08 Massey Ferguson Inc Hydraulic power unit and control system for tractors
US4183287A (en) * 1975-02-22 1980-01-15 Kubota Tekko Co., Ltd. Hydraulic control apparatus for tractor
EP1795061A4 (fr) * 2004-08-24 2008-07-16 Yanmar Co Ltd Structure d'élévateur hydraulique
US20080250917A1 (en) * 2004-08-24 2008-10-16 Yanmar Co., Ltd. Hydraulic Lift Structure
US7775151B2 (en) 2004-08-24 2010-08-17 Yanmar Co., Ltd. Hydraulic lift structure

Also Published As

Publication number Publication date
OA01448A (fr) 1969-07-04
FR76796E (fr) 1961-12-01
GB927176A (en) 1963-05-29

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