EP2761189B1 - Hydraulikzylinder mit ventileinrichtung - Google Patents

Hydraulikzylinder mit ventileinrichtung Download PDF

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Publication number
EP2761189B1
EP2761189B1 EP12768728.3A EP12768728A EP2761189B1 EP 2761189 B1 EP2761189 B1 EP 2761189B1 EP 12768728 A EP12768728 A EP 12768728A EP 2761189 B1 EP2761189 B1 EP 2761189B1
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EP
European Patent Office
Prior art keywords
connection
cylinder
cylindrical
hydraulic cylinder
valve device
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.)
Active
Application number
EP12768728.3A
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German (de)
English (en)
French (fr)
Other versions
EP2761189A1 (de
Inventor
Bertil Lundgren
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.)
Nordhydraulic AB
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Nordhydraulic AB
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Publication date
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Publication of EP2761189A1 publication Critical patent/EP2761189A1/de
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Publication of EP2761189B1 publication Critical patent/EP2761189B1/de
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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
    • 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
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • 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
    • F15B15/26—Locking mechanisms
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst

Definitions

  • the invention relates to a hydraulic cylinder according to the features in the preamble of claim 1 and a double-acting hydraulic cylinder according to the features in the preamble of claim 11.
  • the invention relates to a hydraulic cylinder comprising a hydraulic valve device mounted on the cylinder side for use in mobile hydraulic systems.
  • Mobile hydraulic systems are used, for example, to control mobile machines such as truck-mounted cranes and excavators.
  • Hydraulic valve devices are used to regulate the direction and amount of flow to a hydraulic or working cylinder, which in turn controls the position of the load.
  • the valves are used directly, i.e. mechanical, controlled.
  • most valve devices are remote controlled.
  • the driver or operator no longer controls the valve mechanically by means of a lever device, but instead uses an electric or hydraulic joystick for the remote control mentioned, which in turn controls magnetic coils or solenoids that regulate the fluid (hydraulic oil) in the valve device.
  • the valve device itself does not have to be in the vicinity of the driver or operator, but can be attached to a better location on the machine. If hose rupture protection is required, the best position for the valve can be directly on the hydraulic cylinder, in a so-called distributed valve system.
  • a distributed valve system can also lead to a simplification of the hydraulic piping system and a considerable reduction in the number of pipes and connections, etc.
  • the problem is often that it is expensive to mount the valve on the cylinder and that the space available for mounting the valve on the cylinder is very limited.
  • connection block 2 On the hydraulic cylinder 1 there is a connection block 2, which in this case is welded to the cylinder 1.
  • the connection block 2 contains a fastening side 3 with drilled channels A 'and B' for the two ports of the cylinder 1 and screw holes 5a for attaching a valve device.
  • the cylinder port A which faces the piston side of the hydraulic cylinder 1, is attached under the connection block 2 and cannot be seen in the figure. Instead, however, a connection line 6 can be seen that leads from the connection block 2 to the cylinder port B, which opens out on the piston rod side of the hydraulic cylinder 1.
  • connection block 2 is shown with a valve device 4 attached to the fastening side 3.
  • the connection ports of the directional valve to tank T and pump P are also shown.
  • the valve 4 must therefore be fastened with several large screw bolts 5b which are attached in the holes 5a provided in the connection block 2.
  • This connection means that both the valve 4 and the connection block 2 are relatively large and bulky.
  • fastening with several stable bolts can, in the worst case, lead to deformations in the housing of the valve 4, which, due to the extremely small clearance between the valve slide and the valve housing, can cause changes to the slide that endanger the functioning of the valve and the safety of the machine.
  • a valve device for mounting on a hydraulic cylinder with a first cylinder port having a first cylinder port connection for connection to a first cylinder port on the hydraulic cylinder.
  • the valve device contains a first cylindrical opening for enclosing a cylindrical connecting element which has a first radial fluid opening which is connected to the first cylinder port.
  • the cylindrical opening contains the first cylinder port connection inside.
  • At least two seals are arranged in such a way that they tightly seal the first radial fluid opening on both sides, so that a tight connection between the first cylinder port connection and the first radial fluid opening is created when the connection element is inserted into the first cylindrical opening is introduced.
  • the valve device has valves in the form of check valves.
  • a rotary feedthrough for a pneumatic or hydraulic cylinder belongs to the state of the art.
  • the bolt of this hinge-like device has fluid guides which make it possible to supply a hydraulic cylinder fastened to a wing of the device with fluid.
  • U.S. 3,233,523 A discloses a hydraulic cylinder according to the preamble of claim 1.
  • the invention relates to a hydraulic cylinder with a first cylinder port for connection to a valve device mounted on the hydraulic cylinder, the valve device having a first cylinder port connection for connection to the first cylinder port on the hydraulic cylinder, the first cylinder port connection being arranged so that it can be connected via a Directional valve is optionally connected to a first pressure connection on the pressure side of a pressure supply device, such as a hydraulic pump, or to a first tank connection on a tank.
  • a pressure supply device such as a hydraulic pump
  • the valve device contains a first cylindrical opening for enclosing a cylindrical connection element which has a first radial fluid opening which is connected to the first cylinder port, that the cylindrical opening contains the first cylinder port connection inside and that at least two seals are arranged in such a way that they tightly seal the first radial fluid opening on both sides, so that a tight connection is created between the first cylinder port connection and the first radial fluid opening when the connection element is inserted into the first cylindrical opening, that the hydraulic cylinder has a connection pipe which is firmly connected at its first end to the first cylinder port and which has the connection element with at least the one radial hole which leads into a part of the connection element of the hydraulic cylinder, which part leads to the first end of the pipe that the radial hole to a Enclosing element is to be connected in the valve device, the inside of which contains a cylinder port connection for an enclosing connection to the radial hole of the connection element.
  • the invention provides a valve device with a considerably improved connection, in particular to a double-acting hydraulic cylinder. Because the valve device encloses the connection pipe, the forces from the pressure of the hydraulic fluid in the valve housing are enclosed and the technical problem of the occurrence of a damaged valve slide is completely eliminated. In addition, the assembly of the valve device corresponding to the invention enables a considerable saving of space, since no special fastenings such as screw bolts or the like are required. Another advantage is that the line laying can be considerably simplified due to the valve device according to the invention, because fewer hoses are required and the hoses can also be laid along the hydraulic cylinders, which significantly reduces the required length of the hoses.
  • the Fig. 2 shows a hydraulic cylinder 1 corresponding to the invention with a connecting pipe 10 for connection to a valve device according to the invention.
  • the connecting pipe 10 has a first end 11 which is firmly connected to a first cylinder port A on the piston side of the hydraulic cylinder 1.
  • a free, second, opposite end 12 of the connection pipe 10 contains a connection element 12 a, which is to be connected to another cylinder port B on the piston rod side of the hydraulic cylinder 1.
  • a holder 13 is located at a certain distance d from the second end 12 of the connecting pipe 10 in order to hold the connecting pipe 10 on the hydraulic cylinder 1, but also in order to fasten the connection to a valve device 20, see FIG. Fig. 3 .
  • connection element 15 Fig. 3
  • the enclosing section 21 contains a continuous cylindrical opening 21A and 21B, which is shown by the connection element 15 of the connection pipe 10 is to be penetrated.
  • valve device 20 is shown in place on the connecting pipe 10 and with a piston rod line 16 connected to the connecting part 12a of the free second end 12.
  • the piston rod line 16 connects the valve device 20 to the piston rod side of the hydraulic cylinder 1.
  • the connection between the piston rod line 16 and the free second end 12 of the connecting pipe 10 is preferably arranged so that the valve device 20 is fastened in relation to the connecting pipe 10 and thus also to the hydraulic cylinder 1 and that the piston rod line 16 can be connected to the connecting pipe 10.
  • connection part 12a of free end 12 has a diameter that is smaller or at most as large as the inner diameter of the continuously formed cylindrical opening, which consists of the individual, but continuously connected openings 21A and 21B. This diameter ratio is a prerequisite for the connection part 12a also being able to be passed through the openings 21A and 21B.
  • the valve device 20 also contains connections to a pressure supply device, for example a pump P and a tank T, as well as further connections for a possible further connection to other valve devices.
  • Valve device 20 thus contains a first tank connection port T1 for connection to a tank T and a first pump connection port P1 for connection to a pump P.
  • valve device 20 has a second tank connection port T2 for a possible further connection to a tank connection port of a further valve device and a second pump connection port P2 for a possible further connection to a pump connection port on the same valve device. If the second tank connection port T2 and the other pump connection port P2 are used, the valve device 20 also serves as a feedthrough for the tank or pump connection to the other valve devices. If the second tank connection port T2 and the other pump connection port P2 are not used, they should be closed again using conventional means.
  • the valve device 20 is shown in FIGS Figure 3-5 shown without connected hoses for pumps and tank lines.
  • valve device 20 contains a continuous cylindrical opening 21A and 21B for enclosing the connection element 15 of the connection pipe 10, which is arranged such that it leads the hydraulic fluid partly to the first cylinder port A and partly to the second cylinder port B.
  • the valve device 20 instead contains two openings 21A and 21B which are separate from one another.
  • the cylinder port connections A 'and B' consist of groove-shaped depressions running all around, which are in connection with a directional valve 22 and a corresponding pressure relief valve 27A and 27B via the lines 23 and 24, respectively.
  • connection element 15 of the connection pipe 10 has a solid central part which effectively separates the first cylinder port connection A 'and the second B' from one another.
  • the first cylinder port connection A ′ is also referred to below as the piston connection because it leads to the first cylinder port A on the piston side of the hydraulic cylinder 1.
  • the second cylinder port connection B ′ is also referred to below as the piston rod connection because it leads to the second cylinder port B on the piston rod side of the hydraulic cylinder 1.
  • the connecting tube 10 contains the radial openings 18 and 19 for connecting piston connection A 'and piston rod connection B' respectively to the directional valve 22, which e.g. consists of a valve slide and controls the fluid (oil) via 4 connections or lines 23-26, all of which are connected at one end to the directional valve 22 in a fluid-carrying manner.
  • the second end of the first line 23 is connected to the piston connection A 'and the second line 24 to the piston rod connection B'.
  • the third line 25 is connected to the tank T via the first tank connection port T1 and the fourth line 26 is connected to the pump P via the first pump connection port P1.
  • the position of the directional valve 22 is electrically controlled remotely via a first solenoid S1.
  • a second solenoid S2 is attached to control a pressure regulator in the valve device 20 in a manner not shown here but known to those skilled in the art.
  • the invention is not limited to a specific control mode, but it is also suitable for use in mechanically controlled valves.
  • the directional valve 22 shown can be controlled displaceably to the left and right by means of the first solenoid S1 mentioned. In Fig. 4 it is shown in closed position 22c with no fluid flowing therethrough.
  • the first pump connection port P1 is connected to the piston connection A ′ via the fourth or first line 26 or 23 and via the radial openings 18.
  • a return flow from the piston rod connection B ′ to the first tank connection port T1 is conducted via the radial openings 19 and the second and third lines 24 and 25, respectively.
  • the first pump connection port P1 is connected to the piston rod connection B ′ via the fourth or the second line 26 or 24 and via the radial openings 19.
  • two known pressure relief valves 27A and 27B are shown in the figures, which serve as overload protection and connect the piston port A 'or the piston port B' to the tank port T1 when the pressure in the relevant port exceeds a certain, previously set value.
  • the valve device 20 preferably also contains three seals 28, 29 and 30 which are attached around the cylindrical connection element 15.
  • a first seal 28 is attached such that it tightly closes the connection between the first cylindrical opening 21A and the cylindrical connection element 15 in order to ensure that no fluid can penetrate into the first opening 21A.
  • a second seal 29 is attached in such a way that it tightly closes the connection between the second cylindrical opening 21B and the cylindrical connecting element 15 in order to ensure that no liquid can penetrate into the second opening 21b.
  • a third intermediate seal 30 is attached so that it separates the separate spaces that surround the fluid ports 18 and 19 when the respective valve lines 23 and 24 are connected to the cylinder port connections A 'and B', respectively, to ensure that the liquid cannot penetrate between the cylinder port connections.
  • the seals can consist of conventional O-rings, for example.
  • the openings 21A and 21B it is possible for the openings 21A and 21B to be provided with a seal for the cylindrical connection element 15, which seal consists of an adapted, sufficiently tight-fitting sealing element and does not allow hydraulic fluid to pass through.
  • a seal for the cylindrical connection element 15 which seal consists of an adapted, sufficiently tight-fitting sealing element and does not allow hydraulic fluid to pass through.
  • Those skilled in the art know of other suitable methods for a seal between a tube and an inner rod, and the invention is not limited to any of these known seals. But some kind of seal is required.
  • first and second tank connection ports T1 and T2 are attached to the opposite sides of the valve device 20.
  • first and the second pump connection port P1 and P2 are attached on the opposite sides of the valve device 20. All of these connection ports are attached so that they run essentially parallel to one another, so that the first tank or pump line T1, P1 is parallel to the hydraulic cylinder 1 on one side of the valve device 20 and the second tank or pump line T2, P2 is parallel to the hydraulic cylinder 1 on the other side of the valve device 20.
  • a crane boom 40 with a crane arm 41 and a crane bucket 42 is shown.
  • the boom 40 can be raised and lowered by means of a first hydraulic cylinder 1 on which a first valve device 20 is mounted, which is intended to control the relative movements of the piston rod 6 in relation to the piston.
  • a first line pair with a hose from the tank of the vehicle (not shown) and a hose from the pump are connected to the first valve device 20.
  • the valve device 20 is also connected via a connection pipe 10 to the first cylinder port A on the piston side of the hydraulic cylinder 1 and via a piston rod line 16 to the second cylinder port B on the piston rod side of the hydraulic cylinder 1.
  • a second line pair 44 is connected to a second valve device 20 ′, which controls the angle between the tree 40 and the crane arm 41 by means of a second hydraulic cylinder 1 ′.
  • a third pair of lines 45 coming from the second valve device 20 ′ is connected to a third valve device 20 ′′ which controls the predeterminable angle of the crane bucket 42.
  • FIG. 7 and 8 shows another embodiment of a valve device 35 according to the invention.
  • This valve device 35 is designed as a load-holding valve which differs from the valve device 20 described above primarily in that it does not contain a directional valve and that it has a pressure-regulated valve 37 and a check valve 38 instead.
  • a separate directional valve 36 is connected to the valve device 35. If the directional valve 36 is operated to the left, the hydraulic fluid from pump P flows through the check valve 38 and into the chamber on the piston side of the hydraulic cylinder 1 through the first cylinder port A. The pressure-regulated valve 37 normally remains closed in this position. When the piston rod is pushed up, the hydraulic fluid is forced out from the piston rod side of the cylinder through the second cylinder port B. The hydraulic fluid exiting the piston rod side of the cylinder is directed to tank T through directional valve 36.
  • the pressure side P1 is connected to the other cylinder port B. connected and the first cylinder port A is connected to the tank T at the same time. Since no fluid flows through the check valve 38 in this direction, S A and S B must jointly exceed the spring force of the spring 39 so that the pressure-regulated valve 37 moves into the next open position and the hydraulic fluid leaves the piston side of the cylinder through the first cylinder port A. can.
  • valve device 35 corresponds to a conventional load-holding valve with regard to the connection. What is new is how it is connected to the hydraulic cylinder 1. This is schematically in Fig. 7 and corresponds to the way in which the valve device 20 described above is connected to the hydraulic cylinder 1.
  • the valve device 35 thus in turn contains a through opening 21a-21b through which a connecting pipe 10 is inserted.
  • the connecting pipe 10 is firmly connected at its first end 11 to the first cylinder port A on the hydraulic cylinder 1.
  • the connecting pipe 10 also has a connecting element 15 with at least one radial hole 18.
  • the connecting element is in FIG Fig. 7 integrated in the valve device 35 and therefore not visible.
  • the connection to the separate parts 15A and 15B of the connecting pipe 10 can, however, preferably have essentially the same configuration as in the case of the valve device 20 described above, which is shown in FIG Fig. 4 is shown.
  • the valve device 35 in the form of a load holding valve does not contain a directional valve. Instead, the valve device 35 contains a pressure-regulated valve 37 and a check valve 38 in the Fig. 8 illustrated way.
  • valve device 35 This different configuration of the valve device also results in the connections to the valve device 35 being configured differently. Instead of being connected directly to pump P via a pump or tank connection port and to be connected to the tank T, the valve device 35 is connected to an external directional valve 36.
  • the valve device 35 therefore contains a first further connection A ′′, which is connected to the first cylinder port A via the pressure-regulated valve 37 and the check valve 38, and a second further connection B ′′, which may also be connected to the second cylinder port B via a pressure-regulated valve (not shown) or a check valve, comparable to that already explained for cylinder port A, is connected.
  • the load holding valve is intended to ensure that the hydraulic cylinder does not retract in an uncontrolled manner in the event of a hose rupture. If the hose connection between the first further connection A ′′ and the external directional valve 36 fails, it is still possible to control the lowering or retraction of the hydraulic cylinder. If the pressure on the piston side of the hydraulic cylinder is sufficient for the signal pressure S A from the first cylinder port A alone exceeds the spring force of the spring 39, the pressure-regulated valve 37 moves into a partially open position so that the hydraulic fluid can leave the piston side of the cylinder in a controlled manner through the first cylinder port A.
  • the pump P has to activate one Supply sufficient pressure so that the signal pressure S A from the first cylinder port A and the signal pressure S B from the second cylinder port B together exceed the spring force of the spring 39 and the pressure-regulated valve 37 opens.
  • the greater the pressure conveyed by the pump the greater the signal pressure S B from the second cylinder port e B and the more the pressure-regulated valve 37 is opened. Thanks to the load holding valve 35, it is thus possible to control the lowering of the hydraulic cylinder 1 by operating the external directional valve 36.
  • Both configurations of the valve devices 20 and 35 can be used for both single-acting and double-acting hydraulic cylinders.
  • a load-holding valve can also be designed so that it has a pressure-regulated valve and a check valve for both cylinder ports A and B. This is important in applications where the load can act on both sides in relation to the hydraulic cylinder.
  • the connecting pipe has radial holes for connection to the first cylinder port A.
  • One advantage of the radial holes 18 and 19 is that they are not attached axially to the end of the connecting pipe and that the pressure of the hydraulic fluid cannot generate any forces in the axial direction in this way. The forces are not only absorbed inside the valve device, but also by the seals 28, 29 and 30.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
EP12768728.3A 2011-09-28 2012-09-28 Hydraulikzylinder mit ventileinrichtung Active EP2761189B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1150891A SE535987C2 (sv) 2011-09-28 2011-09-28 Cylindermonterad hydraulisk ventil
PCT/EP2012/004096 WO2013045113A1 (de) 2011-09-28 2012-09-28 Ventileinrichtung

Publications (2)

Publication Number Publication Date
EP2761189A1 EP2761189A1 (de) 2014-08-06
EP2761189B1 true EP2761189B1 (de) 2020-09-16

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Application Number Title Priority Date Filing Date
EP12768728.3A Active EP2761189B1 (de) 2011-09-28 2012-09-28 Hydraulikzylinder mit ventileinrichtung

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EP (1) EP2761189B1 (da)
DK (1) DK2761189T3 (da)
SE (1) SE535987C2 (da)
WO (1) WO2013045113A1 (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104379703B (zh) 2012-06-15 2016-08-24 陶氏环球技术有限责任公司 使用3-(氨基)丙-1,2-二醇化合物处理液化烃的方法
IT201600112773A1 (it) * 2016-11-09 2018-05-09 Dinoil Spa Gruppo attuatore idraulico

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233523A (en) * 1962-10-17 1966-02-08 Scovill Manufacturing Co Fluid cylinder and valve control means therefor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4651220B2 (ja) * 2001-05-07 2011-03-16 株式会社小松製作所 スイベルジョイント付き流体シリンダ
FR2840656B1 (fr) * 2002-06-11 2006-01-06 Souchier Sa Articulation deportee de verins pneumatiques ou hydrauliques, notamment pour la commande d'ouvrants

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233523A (en) * 1962-10-17 1966-02-08 Scovill Manufacturing Co Fluid cylinder and valve control means therefor

Also Published As

Publication number Publication date
DK2761189T3 (da) 2020-10-19
SE1150891A1 (sv) 2013-03-19
EP2761189A1 (de) 2014-08-06
WO2013045113A1 (de) 2013-04-04
SE535987C2 (sv) 2013-03-19

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