US2381923A - Hydraulic drive - Google Patents

Hydraulic drive Download PDF

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Publication number
US2381923A
US2381923A US366840A US36684040A US2381923A US 2381923 A US2381923 A US 2381923A US 366840 A US366840 A US 366840A US 36684040 A US36684040 A US 36684040A US 2381923 A US2381923 A US 2381923A
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United States
Prior art keywords
pipe
piston
cylinder
fluid
space
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
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US366840A
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English (en)
Inventor
Obtresal Robert
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Individual
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Individual
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    • 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
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/26—Fluid-pressure drives
    • B23Q5/266—Fluid-pressure drives with means to control the feed rate by controlling the fluid flow
    • 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
    • F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a 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
    • F15B2211/42—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
    • F15B2211/455—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
    • F15B2211/40—Flow control
    • F15B2211/465—Flow control with pressure compensation

Definitions

  • 'I'his invention relates to hydraulic drives .anu refers more particularly to a device'regulating the speed of a drive actuated by hydraulic means. This device may be used in conjunction with all p machines wherein the speed of a driven body is subjected to certain variations resulting from changes in the resistance opposing the movement of the actuated body. vHowever, the device constituting the subject matter of the present invention is particularly applicable to machine tools, the feed movement of which is actu- .ated by a hydraulic drive, and n which the speed of the feed movement is dependent upon the feed resistance.
  • An object of the present invention is to eliminate this dependency between the speed of the drive and the resistance by the provision -of a ⁇ special regulating device.
  • Another object is the provision of a regulating device for hydraulic ydrives of machine tools andthe like which makes it possibleto maintain a substantially uniform speed of the drive ⁇ or of the feed movement despite changes in tm.
  • adjustable at will and which may -be usedfor -any desired step-wise variation in the speed of the drive or the feed movement.
  • this throttle valve is connected with an automatically operable regulating device which is situated in that part of the hydraulic circuit which suppliesl the' operating fluid to the driving mechans
  • the regulating device varies the amount of fluid flowing to the driving mechanism depending upon the difference in fluid pressure prevailing on both sides of the throttle valve, and upon an additional force which maintains constant this difference in pressure.
  • the hydraulic drive shown in the drawing includes a cylinder 25 containing a piston 26 which is connected on one side with ⁇ a piston rod 21. so that the two side surfaces of the piston 28 are of different size.
  • the comparatively wide piston rod 21 extends through a lsuitable opening formed in the cylinder 25 and is attached to the carriage of the machine tool.
  • the fluid used to loperate the piston 28 is circulated by a pump 34 situated within a container 28.
  • a pipe 35 connected to the pump 34 is provided with a Vbranch pipe 36 which leads to a regulatable throttle valve 31.
  • the pipe 35 communicates with the space 32a within a cylinder 32 of the regulating device.
  • the cylinder 32 contains a piston 39 which is loaded by a spring 4I. Consequently, the regulating device 32, 39 is inserted in that part of the hydraulic circuit which transmits fluid under pressure to the cylinder 25.
  • a pipe 35-a is in communication with the pipe 35 close to the pump 34.
  • This pipe 35-a leads to a relief valve 35-b which is provided with a 'pipe 35-c communicating with the interior of the container 28.
  • a pipe 3l connects the space 32h within the container 32 with a three way cock or change over valve 30.
  • the valve 30 is connected with the space 25a within the cylinder 25 by a pipe 29 and has a valve body provided with threey passages which connect the pipe 29 .with the pipe 3i in the position shown in'Flgure 2.
  • the other end of the cylinder 25 is in communication with the pipe 35 by a return flow pipe 33.
  • Another pipe 29a leads from the valve 38 to the 'interior of the container 28 for the fluid.
  • the throttle valve 31 is connected with the space 92h within the cylinder 32 by the pipe 38.
  • the regulating device 32, 39 includes a spring 4
  • Thek device is operated as follows:
  • the pump 34 causes a ow of liquid under' pressure through the pipe 35, ⁇ the kpipe 36, the throttle valve 31, the pipe 38, the space 32h within the container 32, 'the pipe 3
  • the pump 34 transmits the fluid under a higher pressure through the pipe 35 into the space ⁇ 32a within the cylinder 32. I'his higher pressure, which is also exerted' upon the adjacent surface of the piston 39, is balanced by the force P of the spring 4
  • a device for the circulation of the fluid to and from said cylinder comprising a container for the iiuid, a pump contacting the fluid within said container, a change over valve, a pipe connecting said change over valve l:with one side of said cylinder, aregulating device including a hollow casing having an opening formed therein through which the fluid may flow, a reciprocable piston situated Within said casing, said opening being so located relatively to the last-mentioned piston that it.may be partly covered thereby to vary the amount of fluid transmitted through the opening, a throttle valve, a pipe connecting -one side of said'throttle valve with the space within said casing on one side 'of the last-mentioned piston, another pipe connecting the other side oi said throttle valve with the space within said casing on the other side
  • a regulating device in combination with a piston, driven .by a. fluid, in a. cylinder having two ports o'n opposite sides of said piston respectively, and a container for the fluid provided with a pump. to supply the fluid tothe piston.
  • a pipe from said pump having three branches, a throttle valve having its inlet connected with one branch, a casing connected at one end with a second branch, 'the outlet of the throttle valve being connected with the other end of the casing, a reciprocable piston in said casing between the twoconnections and having a spring urging it toward the firstl mentioned connection, an outlet from said casing so related to said casing piston that vit may be partially covered thereby to vary the amount of fluid passing through -said outlet, a pipe connected with said outlet, means adapted to connect, alternatively, said'last mentioned pipe with one of the cylinder ports, and said cylinder port with said container, and a pipe connecting the third branch of the pipe from the pump with the other ROBERT OBTRESAL.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
US366840A 1939-06-15 1940-11-23 Hydraulic drive Expired - Lifetime US2381923A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2381923X 1939-06-15

Publications (1)

Publication Number Publication Date
US2381923A true US2381923A (en) 1945-08-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US366840A Expired - Lifetime US2381923A (en) 1939-06-15 1940-11-23 Hydraulic drive

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BE (1) BE439550A (enrdf_load_html_response)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532663A (en) * 1946-07-03 1950-12-05 Oilgear Co Clamping mechanism for draw presses
US2533833A (en) * 1946-08-10 1950-12-12 Int Harvester Co Opposed hydraulic ram power transmission, including hydraulically operated power transmission stop
US2618243A (en) * 1947-08-20 1952-11-18 Electro Hydraulics Ltd Alternative control system for fluid-operated motors
US2630787A (en) * 1947-10-06 1953-03-10 Sr Raymond Verch Hydraulic jacking system
US2840170A (en) * 1954-04-28 1958-06-24 United Aircraft Corp Servo control system for a variable pitch propeller
US2840171A (en) * 1955-10-28 1958-06-24 United Aircraft Corp Control system for a variable pitch propeller
US3200713A (en) * 1961-04-04 1965-08-17 Philips Corp Hydraulic servo-mechanism
US3203184A (en) * 1963-10-15 1965-08-31 Whittle Fluid pressure motive systems, for borehole drilling
US3233689A (en) * 1961-11-30 1966-02-08 Whittle Frank Fluid pressure motive systems, primarily for borehole drilling
US3413895A (en) * 1965-12-03 1968-12-03 Plessey Co Ltd Automatic control of piston-type hydraulic actuators
US5188015A (en) * 1991-12-26 1993-02-23 Kelley Company, Inc. Automatically sequenced hydraulic cylinder mechanism

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532663A (en) * 1946-07-03 1950-12-05 Oilgear Co Clamping mechanism for draw presses
US2533833A (en) * 1946-08-10 1950-12-12 Int Harvester Co Opposed hydraulic ram power transmission, including hydraulically operated power transmission stop
US2618243A (en) * 1947-08-20 1952-11-18 Electro Hydraulics Ltd Alternative control system for fluid-operated motors
US2630787A (en) * 1947-10-06 1953-03-10 Sr Raymond Verch Hydraulic jacking system
US2840170A (en) * 1954-04-28 1958-06-24 United Aircraft Corp Servo control system for a variable pitch propeller
US2840171A (en) * 1955-10-28 1958-06-24 United Aircraft Corp Control system for a variable pitch propeller
US3200713A (en) * 1961-04-04 1965-08-17 Philips Corp Hydraulic servo-mechanism
US3233689A (en) * 1961-11-30 1966-02-08 Whittle Frank Fluid pressure motive systems, primarily for borehole drilling
US3203184A (en) * 1963-10-15 1965-08-31 Whittle Fluid pressure motive systems, for borehole drilling
US3413895A (en) * 1965-12-03 1968-12-03 Plessey Co Ltd Automatic control of piston-type hydraulic actuators
US5188015A (en) * 1991-12-26 1993-02-23 Kelley Company, Inc. Automatically sequenced hydraulic cylinder mechanism

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