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GB1269653A - Hydraulic unit for use in the control of a load handling vehicle - Google Patents

Hydraulic unit for use in the control of a load handling vehicle

Info

Publication number
GB1269653A
GB1269653A GB2059669A GB2059669A GB1269653A GB 1269653 A GB1269653 A GB 1269653A GB 2059669 A GB2059669 A GB 2059669A GB 2059669 A GB2059669 A GB 2059669A GB 1269653 A GB1269653 A GB 1269653A
Authority
GB
United Kingdom
Prior art keywords
oil
sections
tank
valve
acting
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
GB2059669A
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.)
Balkankar DSO
Original Assignee
Balkankar DSO
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 Balkankar DSO filed Critical Balkankar DSO
Publication of GB1269653A publication Critical patent/GB1269653A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • 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
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant 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
    • F15B2211/40515—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
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

1,269,653. Lift trucks. DSO BALKANCAR. 22 April, 1969 [24 April, 1968], No. 20596/69. Heading B8H. [Also in Divisions F1 and F2] An hydraulic unit for use in the control of an electric lift truck (not shown) comprises an hydraulic distributer 18 with a single-acting section 21 connected to a lifting cylinder 23 and three double-acting sections 24, 25, 26 respectively connected to double acting cylinders 33, 34 and an hydraulic motor 35 which may be used for tilting or advancing the lifting gear or driving interchangeable attachments. Two pumps 1, 2 coupled to an electric motor 3 supply oil from a tank 4 to lines 7, 8. Valves 13, 15 are mechanically coupled respectively to sections 21, 25. The distributer 18 comprises a normally closed safety valve 18<SP>1</SP> and a by-pass valve 18<SP>11</SP>. When all the sections 21, 24, 25, 26 are inoperative a small portion of the oil entering the distributer 18 passes through a throttle T and all the sections 26, 25, 24, 21 to the tank 4, the pressure difference generated acting to open the by-pass valve 18<SP>11</SP> to return oil to the tank 4. On actuation of one or more of the sections the flow through the throttle is blocked and the by-pass valve 18<SP>11</SP> closes. On actuation of the sections 24, 26 the pumps 1,2 respectively supply oil to lines 7, 8 but the oil from the pump 2 passes through lines 12, 14, 16 and the open valves 13, 15 to the tank 4. On actuation of section 21 or section 25 in one of the most extreme positions, either valve 15 or 13 closes the oil path therethrough and the oil from the pump 2 passes through line 9, non-return valve 10 and line 11 to line 17 to join the oil from the pump 1.
GB2059669A 1968-04-24 1969-04-22 Hydraulic unit for use in the control of a load handling vehicle Expired GB1269653A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG987568 1968-04-24

Publications (1)

Publication Number Publication Date
GB1269653A true GB1269653A (en) 1972-04-06

Family

ID=3897297

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2059669A Expired GB1269653A (en) 1968-04-24 1969-04-22 Hydraulic unit for use in the control of a load handling vehicle

Country Status (4)

Country Link
DE (1) DE1920952A1 (en)
FR (1) FR2006844A1 (en)
GB (1) GB1269653A (en)
YU (1) YU31679B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158150A (en) * 1986-05-13 1992-10-27 Hydra-Powr, Inc. Hydraulic wheelchair
US5284249A (en) * 1993-02-05 1994-02-08 Dorr-Oliver Incorporated Direct hydraulic drive for large flotation cells
JP2001316096A (en) * 2000-02-28 2001-11-13 Toyota Industries Corp Hydraulic device for industrial vehicle

Also Published As

Publication number Publication date
YU101669A (en) 1973-04-30
DE1920952A1 (en) 1970-01-08
FR2006844A1 (en) 1970-01-02
YU31679B (en) 1973-10-31

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