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
  • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
• • 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
  • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
  • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
  • F15B11/0365—Tandem constructions
• • 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
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
• • 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
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/1423—Component parts; Constructional details
  • F15B15/1433—End caps
• • 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
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
• • 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
  • F15B15/20—Other details, e.g. assembly with regulating devices
  • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
  • F15B15/227—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having an auxiliary cushioning piston within the main piston or the cylinder end face
• • 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
  • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
  • E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
• • 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
  • F15B1/02—Installations or systems with accumulators
  • F15B1/04—Accumulators
• • 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
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/1423—Component parts; Constructional details
  • F15B15/1457—Piston rods
• • 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
  • F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations

Definitions

• the present invention concerns a hydraulic cylinder in accordance with the claims.
• Background of the Invention and Prior Art In connection with lifting loads by various types of lifting equipment such as cranes, construction equipment (machinery) and the like, a large amount of energy is used to change both the position of the lifting device's mass and the position of the mass of the lifted load. The energy consumed to lift for example the own weight of a crane arm or similar is not reused but is lost as heat generation and the like. There exists a need for a more energy efficient system in cranes and construction equipment to raise and lower loads.
• the design includes a variant of a second piston which in its one end is connected to the working cylinder and in its other end is movably arranged relative to the inner chamber of the piston rod.
• This design differs greatly from the design of the present invention.
• the second piston is not movably arranged in relation to both the working cylinder and the piston rod.
• a hydraulic cylinder which includes an inner chamber in the piston rod is known via US7478489.
• US7478489 is described a variant of a working cylinder with a piston rod that includes an inner chamber in which a fluid is compressed.
• This design differs substantially from the present invention. For example, it does not include a moveable second piston in accordance with the design according to the present patent application.
• a working cylinder which includes an inner chamber in the piston rod in which a liquid is arranged to be compressed is also described in US7441405. Even this design differs substantially from the present invention. For example, it does not include a moveably arranged second piston in accordance with the present invention.
• DEI 02007061294 describes a variant of a hydraulic cylinder including three lifting chambers. The design includes a working cylinder in the piston rod. Even this design differs
• US5219152 describes a variant of a shock-absorber which includes a first piston with a first piston rod that is hollow.
• the first piston rod has a second rod placed in the first hollow piston rod.
• This design differs substantially from the design in accordance with the present invention.
• the design in accordance with its description describes a shock- absorber which lacks a load carrying function in accordance with the design according to the present invention.
• US4526088 describes a variant of a shock-absorber which includes a variant of a floating piston with which the piston's movement in the cylinder may be affected. This design differs substantially from the design in accordance with the present patent application.
• the design in accordance with its description describes a shock-absorber which lacks a load carrying function in accordance with the present invention.
• One problem with existing energy efficient hydraulic cylinders with a movable piston in a second piston rod's inner chamber is that they are dampening which means that they can start to oscillate. This problem entails for example that these cylinders are unsuited for use in for example cranes and the like.
• the main purpose of the present invention is to create a device and a method for use of the device which eliminate or lessen at least one of the above mentioned problems. This purpose is achieved with the aid of a device and method in accordance with the claims. Detailed Description of the Invention
• Fig. 1 shows a first embodiment of the present hydraulic cylinder.
• Fig. 2 shows a cross-sectional view of the hydraulic cylinder in accordance with Fig. 1.
• Fig. 3 shows in a hydraulic diagram an example of use of the hydraulic cylinder in accordance with the present invention.
• Fig. 4 shows in a second hydraulic diagram a second example of an application for the present hydraulic cylinder.
• Fig. 5 shows in a third hydraulic diagram a third example of an application for a hydraulic cylinder in accordance with the present invention.
• Figs.6A and 6B show a first alternative embodiment of the present hydraulic cylinder.
• Figs.7A and 7B show a second alternative embodiment of the present hydraulic cylinder.
• Fig. 8 shows an alternative embodiment of the embodiments in accordance with Figs.6A and 6B.
• Fig. 9 shows schematically a hydraulic cylinder which is connected to a hydraulic unit.
• Figs.1 OA and 10B show a third alternative embodiment of the present hydraulic cylinder.
• Figs.l 1A and 1 IB show enlarged sections of Figs.1 OA and 10B.
• Figs.l2A and 12B show a fourth alternative embodiment of the present invention.
• Fig. 13 shows in a hydraulic diagram an exemplifying system for controlling pressure in a space and the flow to and from the inner space.
• FIG. 1 an exemplifying version of a hydraulic cylinder 1 is schematically shown in accordance with the present invention.
• the exemplifying hydraulic cylinder's design is only one of the possible embodiments for how a hydraulic cylinder according to the present invention may be designed.
• the shown hydraulic cylinder is not limiting for the design of a hydraulic cylinder in accordance with the present invention.
• the hydraulic cylinder 1 is, in its fundamental design, based upon some previously known hydraulic cylinder which has been modified in accordance with the present invention.
• the hydraulic cylinder (working cylinder) 1 includes a cylinder housing 2 and in it one movable piston 3.
• the cylinder housing 2 includes a cylinder 4, a first end 5 and a second end 6.
• the piston 3 includes a piston head 7 (or similar) and at least one piston rod 8.
• the piston rod 8 runs through a hole (lead-through) in the second end 6 in accordance with previously know technology.
• the first end 5 and the cylinder 4 may either be separate or integrated with one another.
• the second end 6 and the cylinder 4 may either be separate or integrated with one another.
• the piston head 7 separates the inner space of the cylinder housing into at least one first chamber 9 and at least one second chamber 10.
• the first chamber 9 is provided with at least one first connection 11 to which the first chamber in the hydraulic cylinder may be connected to a hydraulic circuit system.
• the second chamber 10 is provided with at least one second connection 12 such as a coupling or the like with which the hydraulic cylinder's second chamber 10 may be connected to a hydraulic circuit (hydraulic system, hydraulic circuit system). Connection of the hydraulic cylinder 1 to the hydraulic system and pressurization of each respective chamber 9 and 10 is done in accordance with previously known technology and this is why this technology is not described in more detail in this patent application.
• the piston 3 will however move in a direction relative to the cylinder where a lesser force (surface times pressure) works against the piston surface.
• the cylinder housing 2 further includes at least one mounting attachment 13 or the like with which the cylinder housing may be attached (connected) to an object or the like.
• the mounting attachment 13 and the first end 5 consist of an integrated unit.
• the piston rod 8 includes in its free end at least one mounting attachment 14 or similar with which the piston rod may be attached (connected) to an object in a for the purpose suitable manner.
• the mounting attachment 13 in the cylinder housing and the mounting attachment 14 in the piston rod consist preferably of a variant of previously known types of mounting attachments which are suitable for the purpose.
• the mounting attachment 13 and the mounting attachment 14 may consist of an ear or other previously known for the purpose suitable type of mounting attachment.
• a unique feature of the present invention is that the piston rod 8 in its axial direction is provided with an inner space 15 which forms a chamber in which a liquid such as hydraulic fluid (oil) or similar may be compressed by at least one second piston 16.
• the inner space 15 is preferably cylindrical with an axial center essentially parallel with the piston rod's 8 axial center.
• the inner cylindrical space's 15 axial center essentially coincides with the piston rod's axial center.
• the piston 16 is movably arranged in relation to the inner space 15. During movement of the piston 16 in the direction into the inner space 15, a compression of the fluid in the inner space will occur.
• the second piston 16 is arranged to be moveable in the inner space 15. Further, the piston 16 is free to move relative the cylinder 4 and in relation to the first end 5.
• the piston 16 runs freely in the essentially cylindrical inner space 15 in the piston rod 8 and the piston 16 is moveably arranged relative the cylinder housing and the cylinder's first end 5.
• the length and form of the piston 16 may vary greatly within the scope of the present invention.
• Fig. 2 shows a piston 16 which has the same or essentially the same diameter in its longitudinal direction. In alternative embodiments it is conceivable that the second piston's 16 diameter varies along its longitudinal direction.
• the inner cylindrical space 15 is via at least one connection 17 attached to a hydraulic circuit, hydraulic system or the like.
• the connection 17 consists of previously known attachment devices such as for example a hydraulic coupling.
• the hydraulic cylinder 1 includes the necessary seals so that satisfactory seals between the piston head and the cylinder housing 2 and between the second piston 16 and the walls in the inner space 15 are achieved. These consist of previously known technology and this is why this technology is not described in more detail in this patent application.
• the first piston 3 strives to move itself so that the chamber 9 lengthens in the hydraulic cylinder's
• the present hydraulic cylinder's design allows for the entire or essentially the entire surface 20 on the piston head in the direction towards the chamber 9 and the second piston's surface 18 to be exposed to the pressure in chamber 9. This leads to the hydraulic cylinder's diameter (dimension) being smaller than previously known designs. In previously known designs the corresponding surface 18 is not presented because it is permanently attached to the cylinder housing's end in these designs.
• a hydraulic cylinder 1 in accordance with the present invention is suitable to be utilized.
• the hydraulic cylinder 1 is used in a crane or similar.
• the hydraulic cylinder 1 is for example used to maneuver the crane arm's (boom's) upward and downward movements.
• the diagram shows a hydraulic pump and accompanying tank for hydraulic fluid (oil).
• the hydraulic cylinder 1 consists of a hydraulic cylinder of a double-acting type which is equipped with a piston rod 8 with an inner cylindrical space 15, in which a freely running piston 16 is moveably arranged.
• Fig. 3 shows schematically a conceivable application in a crane arm or other application where a load is lifted or balanced with at least one hydraulic cylinder in accordance with the present invention.
• at least one hydraulic cylinder is attached to a crane arm or other component in a vehicle (construction equipment) or similar.
• the inner space 15 is, via at least one connection such as a hydraulic coupling or similar, connected via at least one hose (tube, line) or similar to a first pressure accumulator 21.
• the hydraulic cylinder's plus side is connected via a check valve to a first pressure accumulator 21 and the inner space in the hydraulic piston.
• the pump piston's overpressure in the hydraulic cylinder's plus side will create an overpressure in the inner space of the piston rod.
• a restraining force alternatively a load bearing force, will be created in, alternatively with, the hydraulic cylinder by way of this overpressure. This restraining force will reduce the amount of energy used for the operation of the crane arm.
• the pressure in pressure accumulator 21 will normally during normal use be between 250 to 300 bar. In alternative embodiments, another for the purpose suitable pressure that deviates from the mentioned pressures may be used. With reference to Fig. 4, an alternative use of the hydraulic cylinder 1 is shown.
• the inner space 15 is via at least one connection, such as a hydraulic coupling or similar, connected via at least one hose (tube, line) or similar to a first pressure accumulator 21.
• the inner space 15 may even via at least one hose (tube, line) or similar be connected to at least one second pressure accumulator 22.
• the pressure accumulator 21 and/or the pressure accumulator 22 may in alternative embodiments be directly connected to the hydraulic cylinder but are preferably connected to the hydraulic cylinder via at least one check valve.
• the pressure in pressure accumulator 21 is during normal use between 250 to 300 bar.
• the pressure in pressure accumulator 22 is normally between 50 to 80 bar.
• the hydraulic diagram also shows a control valve, a second pressure tank and other hydraulic components such as check valves. Through repeated piston strokes a pressurization of the accumulator tank is created whereby a pressurization of the inner space of the hydraulic piston will occur.
• the pressure in the inner space 15 will cause the check valves to stop flow out from the inner space 15.
• a resisting upwardly directed force in relation to the crane arm
• a flow will be allowed via a valve to a tank valve.
• the resisting force is dimensioned (balanced) according to the force that is necessary to hold up the crane arm.
• the higher pressure from pressure accumulator 21 is used for back pressure during the strain of load (back pressure for both the crane arm's weight and for the lifted load).
• the lower pressure from pressure accumulator 22 is used as back pressure during minimal load strain (back pressure for the crane arm's weight). Thanks to this design less energy will be used for maneuvering
• Fig. 5 shows, in a hydraulic diagram, a third conceivable application for a hydraulic cylinder in accordance with the present invention.
• the hydraulic cylinder is connected between two vehicle parts such as between the chassis and the superstructure of a vehicle.
• a second cylinder 23 which is connected between the chassis and the superstructure (alternatively a counterweight or similar).
• the counterweight creates an overpressure in the inner space in the hydraulic cylinder which in turn is used to lessen energy consumption when maneuvering a crane arm, boom or the like.
• a first alternative embodiment of the present hydraulic cylinder is shown. It has unexpectedly been realized that the accumulator according to the previous figures may be integrated in the hydraulic cylinder's piston rod.
• the inner space 15 in the piston rod 8 is suitable for being filled with gas or a mixture of gasses.
• the piston rod 8 may be filled with nitrogen gas or another for the purpose suitable gas or combination of gases.
• the piston rod's free end it includes at least one refilling device 25 which may be opened and closed in conjunction with gas being filled to the inner space 15 in the piston rod 8.
• the piston 16 is hollow or essentially hollow along its entire length or partial part of its length.
• the piston rod 8 thereby forms a space 26 which in its one end is connected with the entire or part of the inner space 15.
• the second piston 16 includes at least one end side 27 or other material layer which will prevent a flow (leakage) of gas or fluids occurring from space 15 to the first chamber 9. This design allows for an increased volume of gas that may be compressed in relation to the case with a massive piston.
• Figs. 7 A and 7B an alternative embodiment of the present hydraulic cylinder is shown.
• the hydraulic cylinder includes at least one third piston 28 which is preferably arranged to be moveable inside the inner space 15 in the piston rod 8.
• the reason for this is to partition the inner space 15 into one first chamber (space) 29 and one second chamber (space) 30.
• the first chamber 29 is the partitioning part of the inner space 15 which lies closer to the piston rod's free end than the second chamber 30 which lies further from the free end.
• the technical effect of partitioning the inner space 15 into at least one first inner chamber 29 and at least one second inner chamber 30 is that it allows the hydraulic cylinder's back pressure to be increased and decreased.
• Fig. 7 A shows a piston 16 which is massively (solidly) designed.
• Fig. 7B shows a piston 16 which includes an inner space 26.
• an alternative embodiment of the present invention is shown where it includes one inner third piston 28 in the inner space 15 in the piston rod.
• the piston's 28 position is permanent or adjustably arranged with at least one adjusting device 31 in the inner space's longitudinal direction.
• the volume of chamber 30 may be adjusted by moving the inner third piston 28.
• Fig. 9 it is shown how the present hydraulic cylinder 1 allows for control of the pressure in chamber 30.
• the hydraulic cylinder's 1 characteristics in relation to another component, device or similar may be automatically controlled.
• the hydraulic unit may for example consist of a hydraulic cylinder or another hydraulic component in for example a loader (fork lift) or other for the purpose suitable equipment (vehicle, machine).
• Fig. 9 also shows that the piston is provided with at least one seal 33.
• a variant of a hydraulic cylinder 1 which includes a function and a device with which the second piston's 16 ability to move is temporarily limited.
• the hydraulic cylinder includes at least one second inner space 34, preferably a cylindrical space 34, in which the end 35 on piston 16 may be inserted in and out from.
• This design includes at least one seal 36 which creates a seal between the piston (piston rod) 16 when the piston 16 is inserted into the inner space 34.
• a limited pressure against surface 18 on the end 35 on the piston 16 is asserted. The second piston 16 will thus remain in the inserted position.
• the present invention includes at least one conduit (channel) 37 which connects chamber 9 with the second inner space 34.
• the exemplifying embodiment is provided with a valve 38.
• the valve 38 in the exemplifying embodiment consists of a valve which limits the flow between chamber 9 and the inner space 34 when the pressure drops below a certain predetermined level.
• the valve opens and a pressurization of the second inner space 34 may occur by the pressure in chamber 9 being conveyed via the conduit to the inner space 34.
• the pressure in chamber 9 is greater than in the inner space 15 in the piston rod and when the pressure in chamber 9 is greater than in the pressure that will cause the valve 38 to open, the higher pressure against the surface 18 than the pressure in the inner space 15 (against the second piston's end in the space) will cause the second piston 16 to move out from the inner space 34.
• the valve 38 may even include a function such as a check valve which prevents a flow in one direction but allows a flow in the other direction.
• the valve and the check valve may be integrated into one and the same unit (valve) or consist of separate units. In the case of separate units, an additional conduit (not shown in the figures) is preferably used to connect chamber 9 and the inner space.
• valve 38 may consist of controlled valve which may be operated to open and close the flow in conduit 37.
• the valve is controlled by a control system. Control may occur independent of the pressure present in chamber 9 and the inner space 15, alternatively with the sensing of the pressure in these. Control may for example be accomplished by electrical means or by another for the purpose suitable technology.
• the conduit 37 includes at least one restrictor (not shown in the figures) with which a delay of the valve's function may be achieved. Restriction prolongs the time before the valve 38 is activated thereby delaying the piston, piston rod being moved out from the inner space.
• the design includes at least one locking device with which the piston is locked into the inserted position.
• the locking device may consist of any locking device that is suitable for the purpose.
• Figs. 12A and 12B show how the design in accordance with the first embodiment shown in Figs. 1 and 2 and 6A and 6B is provided with a space 34 with a corresponding function that has been described in Figs. 10A and 10 B.
• the piston 16 may be hollow as shown in the figure or be of a solid variant.
• a hydraulic diagram shows an exemplifying embodiment of a system where the pressure in space 15 is arranged to be controllable.
• the control system even controls the flow to and from space 15.
• the system includes at least one control system 39 that includes at least one control unit which controls valve 38.
• the system includes preferably at least one pressure valve 40, pressure transmitter 41 and at least one pressure source 42.
• the pressure source 42 may consist of a hydraulic motor or another for the purpose suitable pressure source.
• Fig. 13 also shows a subsystem for the operation of the hydraulic cylinder's normal function that is to say to control the flow to and from chamber 9 and chamber 10.
• the system even allows for the back pressure (pressure) in space 15 to be controlled. This may be accomplished by controlling the flow of fluid (oil) in and out of space 15.
• the control system even allows for the possibility to control when the piston 16 is to leave its position in the space and when it should be repositioned in the space.
• the system may be controlled to operate with a dampening or without a dampening function.
• the speed of the function as a choke valve may be controlled by this design.
• the present invention achieves several advantages.
• the most important advantage is that at least one of the above mentioned disadvantages is eliminated or at least lessened.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Actuator (AREA)

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• 2014
  • 2014-06-09 SE SE1400288A patent/SE538615C2/sv unknown
• 2015
  • 2015-06-08 WO PCT/SE2015/000035 patent/WO2015190972A1/en active Application Filing
  • 2015-06-08 EP EP15807025.0A patent/EP3152445B1/de active Active

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