EP3276182A1 - Cylindre à effet simple comportant un stockage d'huile - Google Patents

Cylindre à effet simple comportant un stockage d'huile Download PDF

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Publication number
EP3276182A1
EP3276182A1 EP17184133.1A EP17184133A EP3276182A1 EP 3276182 A1 EP3276182 A1 EP 3276182A1 EP 17184133 A EP17184133 A EP 17184133A EP 3276182 A1 EP3276182 A1 EP 3276182A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
chamber
oil
equipment
outlet
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.)
Withdrawn
Application number
EP17184133.1A
Other languages
German (de)
English (en)
Inventor
Rui Jorge Da Silva Bernardes
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.)
Aber- Embraiagens E Comandos Hidraulicos Antonio Bernardes Lda
Original Assignee
Aber- Embraiagens E Comandos Hidraulicos Antonio Bernardes Lda
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 Aber- Embraiagens E Comandos Hidraulicos Antonio Bernardes Lda filed Critical Aber- Embraiagens E Comandos Hidraulicos Antonio Bernardes Lda
Publication of EP3276182A1 publication Critical patent/EP3276182A1/fr
Withdrawn legal-status Critical Current

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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18—Combined units comprising both motor and pump
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members
    • 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
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation

Definitions

  • the present disclosure relates to a simple effect cylinder able for reserving a fluid and to an activation system of simple effect cylinders without resorting to oil tank for the storage thereof.
  • the oil storage is carried out inside the upper/lower chamber of the simple effect cylinder.
  • the system presented in this description consists of using a pump with a flow directional valve, of pressure control and anti-return integrated in a single body, and having the capacity of executing the bypass function of pneumatic or mechanical activation.
  • the installation consists of connecting only two hoses; the intake one and the pressure one directly to the upper and lower chamber of the cylinder, respectively.
  • the simple effect cylinder should preferably have a very small breather with air filter in the upper part thereof preventing the fluid contamination with atmosphere impurities and allowing the volume variation without pressurising or depressurizing therefore not creating movement resistance, nor hindering the pump suction preventing the cavitation thereof.
  • a simple effect cylinder means a cylinder that is activated by one side only carrying out work only in that direction.
  • This schematic arrangement allows the user to execute functions of empty bypass, moving upwards, moving upwards with overpressure annulled by the pressure control valve, moving downwards and end-of-stroke.
  • the end-of-stroke in this scheme needs no extra components or mechanical, pneumatic or hydraulic connections for proper functioning, because it is integrated in the simple effect cylinder. After the total movement of the simple effect cylinder, the oil coming in, comes out totally so that the simple effect cylinder extension no longer occurs.
  • the inlet/outlet is located in the second chamber/plunger chamber and functions as inlet when the fluid circulates in the direction of A to C and functions as outlet when the fluid circulates from C to A; when the inlet/outlet is located in the first chamber/plunger chamber of the rod it functions as outlet when the fluid circulates from A to C and as inlet when the fluid circulates from C to A.
  • the second opening for inlet/outlet of fluid may be located in a lower end of the second chamber.
  • said cylinder may further comprise a breather unit and air filter.
  • said cylinder may comprise an electronic unit for determining when the plunger goes through the first opening for inlet/outlet of fluid.
  • the piston plunger may comprise a segment or set of segments, being that said segment or said set of segments may be formed by a metal alloy, composite, or seal capable of withstanding wear by friction, pressure and/or temperature demands.
  • the cylinder herein disclosed may comprise a connection to a flow directional valve that may be activated pneumatically or hydraulically.
  • the flow directional valve may be of the 3/3 type.
  • the fluid may be oil.
  • the present disclosure further refers to an equipment comprising the cylinder herein disclosed.
  • the equipment may be a construction equipment or, a mining equipment or, a forest equipment.
  • the end-of-stroke scheme may be applied in telescopic cylinders, making the larger tube to be the last to expand.
  • the schematic arrangement is applicable to a cylinder, two cylinders or more, as well as to cylinders of tilting scissors for vehicles.
  • the cylinder without oil tank herein disclosed presents the advantage of suffering a huge reduction in the number of components, thus presenting, it allows a significant weight reduction, less maintenance, less cost and greater reliability, because the seals don't suffer pressure peaks in the extension movement limit and there is very little exchange of air with the exterior, therefore, the pollution of the system is minimal, since the oil functions in closed circuit.
  • the air breather is at the top of the chamber comprising it.
  • the second opening for inlet/outlet of oil is located in a lower end of the second chamber and wherein the first chamber comprises an air breather.
  • An embodiment comprises an electronic unit for determining when the plunger goes through the first opening for inlet/outlet of oil.
  • the piston plunger comprises a segment or a set of segments.
  • the segment or set of segments is formed by a metal alloy, composite, or seal capable of withstanding wear by friction, the pressure and/or temperature demands.
  • the cylinder is configured so that the piston plunger returns by gravity.
  • An embodiment comprises a connection to a flow directional valve and said flow directional valve.
  • the flow directional valve is activated pneumatically or hydraulically.
  • the flow directional valve is of the 3/3 type.
  • An embodiment comprises a pump with flow directional valve.
  • An embodiment comprises an anti-return valve of the oil through the pump.
  • An embodiment comprises a pressure control valve in the pump.
  • the equipment is a construction equipment or, a mining equipment or, a forest equipment.
  • the equipment is a vehicle equipment.
  • the mentioned simple effect cylinder may comprise the following elements in the constitution thereof: a rod chamber/upper chamber/first chamber ( 2 ), a plunger chamber/lower chamber/second chamber ( 5 ), a mobile piston and two inlets/outlets of fluid ( 6 , 7 ), being that one inlet/outlet ( 6 ) is located in the plunger chamber ( 5 ) and functions as inlet when the fluid circulates in the direction of A to C and functions as outlet when the fluid circulates from C to A; while the inlet/outlet ( 7 ) is located in the rod chamber ( 2 ) and functions as outlet when the fluid circulates from A to C and as inlet when the fluid circulates from C to A.
  • Rod chamber or upper chamber of the cylinder ( 2 ), lower chamber of the cylinder ( 5 ) and mobile piston should be understood as explained below.
  • Rod chamber or upper chamber of the cylinder ( 2 ) means the internal space of the cylinder located immediately above the piston plunger ( 4 ), comprising the piston rod ( 3 ), an inlet/outlet ( 6 ) of fluid and optionally an air breather and air filter ( 1 ).
  • Plunger chamber or lower chamber of the cylinder ( 5 ) means the internal space of the cylinder located immediately below the piston plunger ( 4 ) and comprising an inlet/outlet ( 7 ) of fluid.
  • Mobile piston means the set formed by the plunger ( 4 ) and by the rod ( 3 ) of the piston.
  • the lower chamber of the cylinder ( 5 ) is filled with fluid while the rod chamber of the cylinder ( 2 ) is partially filled with fluid. In this embodiment it occurs when the system is on end-of-stroke or when the system is moving upwards.
  • the upper chamber functions as a tank and is not empty, having typically an amount of oil necessary for the proper functioning of the system and that can be about 15% of oil or more.
  • the piston plunger ( 4 ) may present one or more segments in the constitution thereof.
  • the simple effect cylinder may present an electronic system for detecting the end-of-stroke mode.
  • Figure 1 represents an embodiment of the present disclosure. Said figure represents the system in a situation wherein the fluid circulation is made through the pump ( 11 ), of the anti-return valve ( 10 ) and the 3/3 valve (3 ways; 3 positions) ( 9 ) when it is in the resting position. This embodiment describes a situation designated as bypass.
  • FIG. 2 An embodiment is represented in figure 2 .
  • the system is represented executing the moving upwards function of the piston.
  • the pump ( 11 ) allows the fluid circulation in the direction of A to C, passing through the anti-return valve ( 10 ) and through the 3/3 valve (3 ways; 3 positions) ( 9 ), so that the fluid enters the lower chamber of the cylinder ( 5 ) through the inlet/outlet of the fluid ( 7 ).
  • Introducing fluid in the lower chamber of the cylinder (5) allows the piston to move upwards and the consequent outlet of fluid from the upper part of the cylinder ( 2 ) through the inlet/outlet of the fluid ( 6 ).
  • 3/3 valve (3 ways; 3 positions) ( 9 ) is activated pneumatically in the direction of Y to X.
  • Figure 3 represents an embodiment of the present disclosure.
  • the figure represents the system carrying out the moving upwardsfunction on overpressure.
  • the same is annulled when the pressure control valve is activated ( 8 ), allowing the fluid to circulate in the direction of A to C, transiting through the pressure control valve ( 8 ) and returning to the pump ( 11 ), thereby eliminating the overpressure exerted in the cylinder.
  • This embodiment occurs when the system exceeds working pressure.
  • Working pressure may be defined and adjustable to operation. Therefore, working pressure may be defined by the client and it may be adjustable.
  • the valve 8 may be tuned with a pressure 10% superior to the maximum system pressure.
  • different systems may need different working pressures.
  • 3/3 valve (3 ways; 3 positions) ( 9 ) is activated pneumatically in the direction of Y to X.
  • Figure 4 corresponds to an embodiment of the present disclosure wherein the system is on end-of-stroke.
  • the cylinder piston is in the maximum extension thereof.
  • the maximum extension of the cylinder piston occurs when the plunger thereof exceeds the inlet/outlet ( 6 ) of the fluid when it circulates in the direction A to C and when the lower chamber of the cylinder ( 5 ) is full with the fluid.
  • 3/3 valve (3 ways; 3 positions) ( 9 ) is activated pneumatically in the direction of Y to X.
  • Figure 5 further represents an embodiment of the present disclosure.
  • the figure represents the system operating moving downwards.
  • the moving downwards of the piston occurs by gravity and without any intervention or action of the pump ( 11 ).
  • the fluid is removed from the lower chamber of the cylinder ( 5 ) through the inlet/outlet ( 7 ), is transferred to the 3/3 valve (3 ways; 3 positions) ( 9 ), which is activated pneumatically in the direction of X to Y, and enters the rod chamber of the cylinder ( 2 ) through the inlet/outlet ( 6 ). Therefore, the lower chamber of the cylinder ( 5 ) is emptied of fluid that will afterwards fill in the rod chamber of the cylinder ( 2 ). Filling in the rod chamber ( 2 ) allows the cylinder piston to return to the initial position thereof, by gravity. In this embodiment, the fluid circulates in the direction of C to A.

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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)
EP17184133.1A 2016-07-29 2017-07-31 Cylindre à effet simple comportant un stockage d'huile Withdrawn EP3276182A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PT10955716 2016-07-29

Publications (1)

Publication Number Publication Date
EP3276182A1 true EP3276182A1 (fr) 2018-01-31

Family

ID=59895027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17184133.1A Withdrawn EP3276182A1 (fr) 2016-07-29 2017-07-31 Cylindre à effet simple comportant un stockage d'huile

Country Status (1)

Country Link
EP (1) EP3276182A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939284A (en) * 1958-10-08 1960-06-07 Gertz Donald Hydraulic drive with integral sump
GB2277354A (en) * 1993-03-15 1994-10-26 Scanlan Thomas Robert Hydraulic piston and cylinder assembly
CN201212499Y (zh) * 2008-06-26 2009-03-25 岳双喜 防爆缸防渗漏型电力液压推动器
CN201330766Y (zh) * 2008-12-11 2009-10-21 东风汽车有限公司 集成式全功能电动液压油缸
NO20150966A1 (en) * 2015-07-24 2017-01-25 Macgregor Norway As Hydraulic actuator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939284A (en) * 1958-10-08 1960-06-07 Gertz Donald Hydraulic drive with integral sump
GB2277354A (en) * 1993-03-15 1994-10-26 Scanlan Thomas Robert Hydraulic piston and cylinder assembly
CN201212499Y (zh) * 2008-06-26 2009-03-25 岳双喜 防爆缸防渗漏型电力液压推动器
CN201330766Y (zh) * 2008-12-11 2009-10-21 东风汽车有限公司 集成式全功能电动液压油缸
NO20150966A1 (en) * 2015-07-24 2017-01-25 Macgregor Norway As Hydraulic actuator

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