GB689688A - Improvements in or relating to hydraulic power systems - Google Patents

Improvements in or relating to hydraulic power systems

Info

Publication number
GB689688A
GB689688A GB23746/49A GB2374649A GB689688A GB 689688 A GB689688 A GB 689688A GB 23746/49 A GB23746/49 A GB 23746/49A GB 2374649 A GB2374649 A GB 2374649A GB 689688 A GB689688 A GB 689688A
Authority
GB
United Kingdom
Prior art keywords
piston
valve
leakage
line
sump
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
GB23746/49A
Inventor
Hugh Graham Conway
George Orloff
Roy Fairclough
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.)
British Messier Ltd
Original Assignee
British Messier Ltd
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 British Messier Ltd filed Critical British Messier Ltd
Priority to GB23746/49A priority Critical patent/GB689688A/en
Publication of GB689688A publication Critical patent/GB689688A/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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/042—Controlling the temperature of the fluid
    • F15B21/0427—Heating
    • 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
    • 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
    • F15B2211/421—Flow control characterised by the type of actuation mechanically
    • F15B2211/422—Flow control characterised by the type of actuation mechanically actuated by biasing means, e.g. spring-actuated
    • 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
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/85—Control during special operating conditions
    • F15B2211/851—Control during special operating conditions during starting

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)

Abstract

689,688. Hydraulic machines. BRITISH MESSIER, Ltd. Sept. 13, 1950 [Sept. 14, 1949 ; Nov. 21, 1949], Nos. 23746/49 and 29783/49. Class 69 (ii). Leakage of working fluid from the pressure to the return side of a motor element, e.g. a jack piston 24, Fig. 2, is effected through a narrow aperture 57 and a passage 53 in series therewith controlled by a valve 54 which is normally held closed during movement of the piston and is opened at the end of the stroke, the valve port being of greater crosssectional area than the aperture 57. The valve 54 is opened against a spring 55 by a lifting member 58 itself actuated by a tappet 60 connected to a sleeve 62 by a cross-pin 61 slidable within a slot 63 in the piston rod 25. The leakage fluid exhausts through a space 65 to a line 19. In a modification the valve comprises a ball floating between two springs and the lifting member is eliminated. In a further modification wherein leakage through the piston 24, Fig. 3, is controlled from the other end of the jack the narrow aperture comprises a bored plug 72 at the end of the space 65 and in a still further modification a spring- biased lift valve is operated by a solenoid energised automatically at the end of the piston stroke. The controlled leakage serves to prevent freezing of the working fluid, and in operation a supply pump 11, Fig. 1, draws fluid from a sump 21 and delivers it through a by-pass valve 13 and a distributer 15 to the lower side of the piston 24 which at the end of its stroke allows restricted flow through a line 18, the distributer 15 and a line 20 back to the sump 21. An electrically-driven auxiliary pump 30 may replace the pump 11 and draw from the sump 21 through a duct 36 and deliver through a line 37 and the valve 15 to one or other side of the piston 24. The leakage construction may be applied to a jack having a locking device as described in Specification 527,225.
GB23746/49A 1949-09-14 1949-09-14 Improvements in or relating to hydraulic power systems Expired GB689688A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB23746/49A GB689688A (en) 1949-09-14 1949-09-14 Improvements in or relating to hydraulic power systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23746/49A GB689688A (en) 1949-09-14 1949-09-14 Improvements in or relating to hydraulic power systems

Publications (1)

Publication Number Publication Date
GB689688A true GB689688A (en) 1953-04-01

Family

ID=10200635

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23746/49A Expired GB689688A (en) 1949-09-14 1949-09-14 Improvements in or relating to hydraulic power systems

Country Status (1)

Country Link
GB (1) GB689688A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2366473A1 (en) * 1976-10-04 1978-04-28 Caterpillar Tractor Co HYDRAULIC SYSTEM FOR EXTREMELY COLD ENVIRONMENTS
EP0743468A2 (en) * 1995-04-26 1996-11-20 Steyr-Daimler-Puch Aktiengesellschaft Hydraulic activator and clutch provided therewith

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2366473A1 (en) * 1976-10-04 1978-04-28 Caterpillar Tractor Co HYDRAULIC SYSTEM FOR EXTREMELY COLD ENVIRONMENTS
EP0743468A2 (en) * 1995-04-26 1996-11-20 Steyr-Daimler-Puch Aktiengesellschaft Hydraulic activator and clutch provided therewith
EP0743468A3 (en) * 1995-04-26 1996-12-04 Steyr Daimler Puch Ag
US5690204A (en) * 1995-04-26 1997-11-25 Steyr-Daimler-Puch Aktiengesellschaft Hydraulic actuator and clutch therewith

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