GB1386576A - Tractor hydraulic lift system - Google Patents

Tractor hydraulic lift system

Info

Publication number
GB1386576A
GB1386576A GB1116373A GB1116373A GB1386576A GB 1386576 A GB1386576 A GB 1386576A GB 1116373 A GB1116373 A GB 1116373A GB 1116373 A GB1116373 A GB 1116373A GB 1386576 A GB1386576 A GB 1386576A
Authority
GB
United Kingdom
Prior art keywords
pressure
chamber
passage
fluid
control 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
Application number
GB1116373A
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.)
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Motor Co Ltd
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Motor Co Ltd
Publication of GB1386576A publication Critical patent/GB1386576A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • A01B63/1117—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 using a hitch position sensor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2271—Actuators and supports therefor and protection therefor
    • 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
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves
    • 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
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/35—Directional control combined with flow 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
    • F15B2211/40—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
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a 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
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

1386576 Tractor hydraulic Systems FORD MOTOR CO LTD 7 March 1973 [8 March 1972] 11163/73 Heading A1P A control mechanism for a tractor hydraulic lift system has passages 15 and 16 in a lift cylinder body 10 supplying fluid to and from the lift cylinder through a lift control valve 46. A constant displacement pump supplier fluid via passage 12 to the valve assembly and fluid is returned to sump via passage 14. A control valve 17 shown in the neutral position in Fig. 1 moves to the left for raising and to the right for lowering the implement. In the lowering position Fig. 4 (not shown) port 26 is uncovered and fluid is fed to chamber 27 thus forcing the unload valve 19 to the right and permitting pump supply fluid in passage 12 to return to sump via passage 14. At the same time control valve 17 progressively uncovers axially spaced metering ports 31 connected with the lift covered as the control valve 17 moves to the left. (Fig. 3, not shown, being the full raise position.) Pressure in supply passage 15 is also fed to chamber 40 in bushing 34 of automatic flow control valve 20. Position of the valve 20 is determined by balance between spring 39 plus pressure in chamber 40 against pressure in chamber 42. Chamber 42 is fed with pump supply pressure from passage 12 via passage 44. The flow control valve 20 operates only when the unload valve 19 is not passing the output of the pump directly to passage 14 and sump. Pressure drop across passages 12 and 15 depends on number of ports 29 uncovered by land 30. In the slow raise position Fig. 2 (not shown) ports 29 are partially uncovered so that pressure drop across passages 12 and 15 is fairly high. In this condition full pump pressure in chamber 42 overcomes combined spring and passage 15 pressure in chamber 40 to move the automatic flow control valve 20 to the left Fig. 2 (not shown) so that the land 35 uncovers port 33 and pump pressure is released via passage 37 to sump. With control valve 17 in full raise position Fig. 3 (not shown) ports 29 are fully uncovered resulting in low pressure drop between passages 15 and 12. In this condition pressure in chamber 40 plus spring pressure overcomes pump pressure in chamber 42 so that valve 20 moves to the right preventing return of fluid via passage 37 and making maximum fluid available for ram operation. In order to prevent overheating by fluid being continually by-passed via passage 37, the valve system is designed so that when the control valve 17 is permitting only a small amount of fluid to pass to the inlet passage 15, the land 25 will uncover groove 26 so as to pressurize chamber 27 and unload the system via passage 14.
GB1116373A 1972-03-08 1973-03-07 Tractor hydraulic lift system Expired GB1386576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23280772A 1972-03-08 1972-03-08

Publications (1)

Publication Number Publication Date
GB1386576A true GB1386576A (en) 1975-03-12

Family

ID=22874675

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1116373A Expired GB1386576A (en) 1972-03-08 1973-03-07 Tractor hydraulic lift system

Country Status (11)

Country Link
JP (1) JPS48103303A (en)
AR (1) AR193790A1 (en)
AU (1) AU476353B2 (en)
BE (1) BE796376A (en)
BR (1) BR7301102D0 (en)
CA (1) CA964163A (en)
DE (1) DE2308146C2 (en)
FR (1) FR2174837B1 (en)
GB (1) GB1386576A (en)
IT (1) IT976990B (en)
ZA (1) ZA7382B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2452612C2 (en) * 1974-11-06 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart Switching valve
DE3018926A1 (en) * 1980-05-17 1981-11-26 Robert Bosch Gmbh, 7000 Stuttgart HYDRAULICALLY ACTUATED LIFTING DEVICE ON WORK VEHICLES
CN101846110B (en) * 2010-05-18 2012-12-26 陈浩 Full-balanced control valve
FR3083271B1 (en) * 2018-06-27 2020-09-04 Safran Landing Systems CONTROL PROCEDURE FOR A THREE-POSITION DRAWER DISPENSER

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1363918A (en) * 1963-03-04 1964-06-19 Renault Hydraulic implement lifting and force control device for agricultural tractors
US3565110A (en) * 1969-08-04 1971-02-23 Commercial Shearing Control valves

Also Published As

Publication number Publication date
AU476353B2 (en) 1976-09-16
DE2308146A1 (en) 1973-09-13
IT976990B (en) 1974-09-10
CA964163A (en) 1975-03-11
BR7301102D0 (en) 1974-09-24
AU5092873A (en) 1974-07-11
BE796376A (en) 1973-07-02
ZA7382B (en) 1973-09-26
AR193790A1 (en) 1973-05-22
FR2174837B1 (en) 1976-05-14
FR2174837A1 (en) 1973-10-19
DE2308146C2 (en) 1985-01-24
JPS48103303A (en) 1973-12-25

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee