EP3322903B1 - Doppeltwirkender hydraulikzylinder - Google Patents

Doppeltwirkender hydraulikzylinder Download PDF

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Publication number
EP3322903B1
EP3322903B1 EP16736882.8A EP16736882A EP3322903B1 EP 3322903 B1 EP3322903 B1 EP 3322903B1 EP 16736882 A EP16736882 A EP 16736882A EP 3322903 B1 EP3322903 B1 EP 3322903B1
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EP
European Patent Office
Prior art keywords
cylinder
double
pressure chamber
acting hydraulic
hydraulic cylinder
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
EP16736882.8A
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German (de)
English (en)
French (fr)
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EP3322903A1 (de
Inventor
Rolf Revenus
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.)
Maquet GmbH
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Maquet GmbH
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Publication date
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Publication of EP3322903A1 publication Critical patent/EP3322903A1/de
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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
    • F15B15/08—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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • 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
    • F15B15/1438—Cylinder to end cap 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
    • F15B2211/7053—Double-acting output members

Definitions

  • the invention relates to a double-acting hydraulic cylinder with a first connection for charging a first pressure chamber with a hydraulic fluid and a second connection for charging a second pressure chamber with the hydraulic fluid.
  • Double-acting hydraulic cylinders are known from the prior art.
  • Figure 8a shows an exemplary schematic diagram of a double-acting hydraulic cylinder 100 according to the prior art.
  • the well-known hydraulic cylinder 100 after Figure 8a comprises a cylinder housing 102 and a piston 104 guided in the cylinder housing 102.
  • the cylinder housing 102 comprises a first pressure chamber 106 formed by the cylinder housing 102 and a second pressure chamber 108 formed by the cylinder housing 102.
  • the first pressure chamber 106 and the second pressure chamber 108 are connected by the Pistons 104 separated from each other.
  • the first pressure chamber 106 is also referred to as cylinder chamber A
  • the second pressure chamber 108 is also referred to as cylinder chamber B.
  • the cylinder chambers 106, A, and 108, B must be connected to a supply unit/control unit 110, which supplies the hydraulic cylinder 100 with a liquid or gaseous medium.
  • the connection between the supply unit/control unit 110 and the connection 112 or 114 on the cylinder housing 102 is made via a flexible hose 116, 118.
  • a pressed ring eye 120 made of metal, a hollow screw 122 and two seals 124, 126 are attached to the respective end of the hose , like it in Figure 8c is shown schematically.
  • Figure 8c 12 is a schematic representation of an exposed banjo bolt 122 of the known hydraulic cylinder 100 according to FIG Figure 8a shown.
  • a hose 116, 118 with a nominal diameter of DN 3 and DN 4 is typically used.
  • the screw connection has a height L1 from the outer surface of the cylinder housing 102 to the end of the hollow screw 122 of approximately 15 mm.
  • the hoses 116, 118 are necessary if the in Figure 8a shown cylinder 100 is movably mounted.
  • Figure 8b shows a schematic representation of a double-acting hydraulic cylinder 200 according to the prior art.
  • Figure 8b In particular, a spare parts picture of the double-acting hydraulic cylinder 200 of the CSH1 MF3, MF4, MT4 and MS2 series according to the Bosch Rexroth catalog with the catalog number RD17332/07.13 is shown.
  • the A-side, ie on the piston side, and on the B-side, ie on the piston rod side each have a connection for a liquid medium.
  • this will be like in Figure 8b shown, realized by a connection bore 212, 214 in the housing of the double-acting hydraulic cylinder 200.
  • the well-known, double-acting hydraulic cylinders have the disadvantage that, if the Figure 8a shown cylinder housing 102 with the hose connections 112, 114 is used in tight spaces, which in Figure 8c shown hollow screw 122 is very exposed and disturbing at the respective end of the hose. This is particularly disadvantageous in that approximately 15 mm of installation space is lost in the length or width of the hydraulic cylinder. Furthermore, the known, double-acting hydraulic cylinders have the disadvantage that the exposed banjo bolt 122 can easily shear off on nearby components in the moving hydraulic cylinders due to the high cylinder forces during the displacement movement. In addition, the in Figure 8a shown hose connections 116, 118 relatively susceptible to damage in the known, double-acting hydraulic cylinders.
  • a double-acting hydraulic cylinder with the features of claim 1 achieves a compact and robust design of the double-acting hydraulic cylinder and at the same time reliable operation of the same, since in particular a first cylinder housing, a piston guided in the first cylinder housing and a second cylinder housing are provided.
  • a first pressure chamber and a second pressure chamber are provided in the first cylinder housing and are separated from one another by the piston.
  • a first connection is used at least to supply hydraulic fluid to the first pressure chamber, while a second connection is used at least to supply hydraulic fluid to the second pressure chamber.
  • the second cylinder housing surrounds the first cylinder housing at least in one section. The first connection and the second connection are arranged on an end of the double-acting hydraulic cylinder that faces away from the second pressure chamber.
  • the second pressure chamber can be acted upon by the hydraulic fluid via the section in which the second cylinder housing surrounds the first cylinder housing.
  • this connection can be provided on the A-side of the double-acting hydraulic cylinder.
  • the A side is located on a first side of the piston, while the B side is located on a second side of the piston opposite the first side.
  • connection hoses which extend between the connections of the double-acting hydraulic cylinder and the supply/control unit (such as a hydraulic unit), can be prevented during operation of the double-acting hydraulic cylinder. This enables the compact and robust construction of the double-acting hydraulic cylinder and, at the same time, the reliable operation of the same.
  • the second cylinder housing surrounds the first cylinder housing at least in a section along the longitudinal axis of the double-acting hydraulic cylinder.
  • a section in which the second cylinder housing surrounds the first cylinder housing can be provided, which section extends along the longitudinal axis of the double-acting hydraulic cylinder.
  • the end of the double-acting hydraulic cylinder facing away from the second pressure chamber is delimited by a cylinder base.
  • the cylinder base encloses an end of the first cylinder housing which is remote from the second pressure chamber and an end of the second cylinder housing which is remote from the second pressure chamber.
  • first connection and the second connection are arranged on the cylinder base.
  • both the first connection and the second connection can be provided on an end of the double-acting hydraulic cylinder that faces away from the second pressure chamber.
  • the first connection comprises a first through opening. Furthermore, the first through hole extends from a side surface of the cylinder bottom to the first pressure chamber. A first passage opening can thus be provided in the cylinder base, via which the first pressure chamber can be acted upon by the hydraulic fluid.
  • the first pressure chamber is preferably a pressure chamber on the piston side, while the second pressure chamber is a pressure chamber on the piston rod side.
  • the hydraulic cylinder is in particular a differential cylinder.
  • a pressure chamber on the piston side and a pressure chamber on the piston rod side of a differential cylinder can thus be provided, each of which is formed by the first cylinder housing.
  • a first sealing element is preferably arranged between the end of the first cylinder housing facing away from the second pressure chamber and the cylinder base. Furthermore, a second sealing element is arranged between the end of the second cylinder housing facing away from the second pressure chamber and the cylinder base. A first and second sealing element can thus be provided, with the aid of which the end of the first cylinder housing facing away from the second pressure chamber or the end of the second cylinder housing facing away from the second pressure chamber and the cylinder base can be sealed from one another.
  • the first cylinder case and the second cylinder case are arranged such that a clearance is formed between the first cylinder case and the second cylinder case.
  • the intermediate space extends from the end of the double-acting hydraulic cylinder that faces away from the second pressure chamber to an end of the double-acting hydraulic cylinder that faces away from the first pressure chamber.
  • an intermediate space can be provided between the first and second cylinder housing, this intermediate space being used to connect the second pressure chamber to the second port on the second pressure chamber opposite end of the double-acting hydraulic cylinder.
  • the rod bushing includes a recess.
  • the hydraulic fluid can be applied to the second pressure chamber via the section in which the second cylinder housing surrounds the first cylinder housing and via the recess in the rod bushing.
  • the pressure chamber on the piston rod side can thus be pressurized with the hydraulic fluid easily and reliably with the aid of the second connection, which is provided on the piston-side end of the double-acting hydraulic cylinder.
  • the first cylinder housing includes a first cylinder tube and the second cylinder housing includes a second cylinder tube.
  • a simple and robust construction of the double-acting hydraulic cylinder can be implemented.
  • the double-acting hydraulic cylinder preferably comprises at least one first holding element for holding the second cylinder housing. Furthermore, the at least one first holding element is arranged at least in sections around the second cylinder housing on an outer surface of the second cylinder housing. The first and second cylinder housings can thus be held easily and securely on the cylinder base with the aid of the at least one first holding element.
  • the first connection is preferably designed in such a way that it can be connected to a first connecting line at least for supplying the hydraulic fluid.
  • the second connection is designed in such a way that it can be connected to a second connecting line at least for supplying the hydraulic fluid.
  • the double-acting hydraulic cylinder can in particular be a differential cylinder, synchronous cylinder or tandem cylinder.
  • Figure 1a shows a schematic, perspective view of a double-acting hydraulic cylinder 10 according to an embodiment.
  • a double-walled cylinder is shown in a cut-open view.
  • the double-acting hydraulic cylinder 10 includes a first cylinder tube 14, a second cylinder tube 16, and a piston 26.
  • the piston 26 is connected to a piston rod 24.
  • the longitudinal axis 30 of the double-acting hydraulic cylinder 10 extends through a midpoint of the piston rod 24 along a longitudinal extent of the piston rod 24.
  • the first and second cylinder tubes 14, 16 are arranged concentrically around this longitudinal axis 30 of the double-acting hydraulic cylinder 10.
  • the first cylinder tube 14 is provided, on which the piston 26 slides in a sealed manner and generates the force of the actuator. Furthermore, the second cylinder tube 16 is arranged around this first cylinder tube 14 . A first end of the second cylinder tube 16 on the piston rod side is tightly connected to a rod bushing 22 . A second end of the cylinder tube 16 opposite the first end is tightly connected to a cylinder base 12 .
  • the first cylinder tube 14 serves as an inner cylinder tube, while the second cylinder tube 16 serves as an outer cylinder tube.
  • the second cylinder tube 16 is held on the cylinder base 12 via a wire ring 20a and an annular holding element 20b with the aid of screws 46a to 46d.
  • the cylinder base 12 and the annular holding element 20b form one section of the double-acting hydraulic cylinder 10.
  • the second cylinder tube 16 is sealed against this section. In the sectional view Figure 1a the screw 46d is not shown.
  • the double-acting hydraulic cylinder 10 includes a connection 34 for applying a hydraulic fluid to a pressure chamber 38 on the piston rod side.
  • this connection 34 is provided in the cylinder base 12 .
  • the connection 34 arranged in the cylinder base 12 is preferably connected to the intermediate space 40 between the first and second cylinder tubes 14, 16 via bores.
  • the closure 22 arranged on the piston rod-side end of the double-acting hydraulic cylinder 10 with a piston rod passage comprises a groove 42.
  • This closure 22 can also be referred to as a rod bushing.
  • the embodiment shown is introduced into the pressure chamber 38 on the piston rod side via this groove 42 in the rod bushing 22 .
  • connection 34 arranged in the cylinder base 12
  • the pressure chamber 38 on the piston rod side ie the B side of the double-acting hydraulic cylinder 10
  • the pressure chamber 38 on the piston rod side ie the B side of the double-acting hydraulic cylinder 10
  • the pressure chamber 38 on the piston rod side can be charged with the hydraulic fluid or hydraulic fluid can be discharged from the pressure chamber 38 .
  • the in Figure 1a The double-acting hydraulic cylinder 10 shown has a connection 32 for applying the hydraulic fluid to the pressure chamber 36 on the piston side and for draining hydraulic fluid from this pressure chamber.
  • This connection 32 and the pressure chamber 36 on the piston side are in Figure 1a not shown.
  • the outside diameter formed by the second cylinder tube 16 is the relevant variable.
  • Figure 1b shows a schematic plan view of the double-acting hydraulic cylinder 10 after Figure 1a .
  • the cylinder base 12 is shown schematically with the screws 46a to 46d extending through the cylinder base 12.
  • Figure 1b 12 is used to show first through third intersection lines 48a, AA, 48b, BB, and 48c, CC, with respect to cylinder head 12.
  • the following figures 2 , 3 and 4a are sectional views of sections along the in Figure 1b shown first to third cutting lines 48a to 48c.
  • figure 2 shows a schematic sectional representation of a longitudinal section along the section line 48a, AA in Figure 1b .
  • the schematic sectional view figure 2 are essentially the elements 12 to 44 of the double-acting hydraulic cylinder 10 after Figure 1a clearly visible.
  • the inside Figure 1a The connection 34 shown for applying hydraulic fluid to and discharging the pressure chamber 38 on the piston rod side is in figure 2 not visible.
  • the double-acting hydraulic cylinder 10 includes the first cylinder tube 14 and the one guided in the first cylinder tube 14 Piston 26.
  • the first cylinder tube 14 preferably comprises the piston-side pressure chamber 36 formed by the first cylinder tube 14 between the piston 26 and the first end, opposite the piston rod 24, of the cylinder tube 14 closed by the cylinder base 12 and the piston-rod-side pressure chamber 38 formed by the first cylinder tube 14 between the piston 26 and the second end of the cylinder tube 14 closed by the rod bushing 22.
  • the pressure chamber 36 on the piston side and the pressure chamber 38 on the piston rod side are separated from one another by the second piston 26.
  • the second end of the first cylinder tube 14 closed with the aid of the rod bushing 22 is also referred to as the end on the piston rod side
  • the second end of the cylinder tube 14 closed with the aid of the cylinder base 12 is also referred to as the end on the piston side.
  • a first sealing element 18a is arranged between the piston-side end of the first cylinder tube 14 and the cylinder base 12 .
  • a second sealing element 18b is arranged between the piston-side end of the second cylinder tube 16 and the cylinder base 12 .
  • a third sealing element 18c can be provided, which is arranged between the end of the second cylinder tube 16 on the piston rod side and the rod bushing 22 .
  • the first to third sealing elements 18a to 18c comprise a static sealing element, such as. B. an O-ring.
  • the second cylinder tube 16 can be reliably sealed against the cylinder base 12 or the rod bushing 22 at its piston-side and piston-rod-side ends.
  • the double-acting hydraulic cylinder 10 comprises a first and second screw connection 28a, 28b.
  • the first screw connection 28a serves to connect the piston 26 to the piston rod 24, while the second screw connection 28b serves to connect a unit on the piston rod side to the piston rod 24.
  • the first and second screw connection 28a, 28b comprise a thread, which is arranged on the piston-side or piston-rod-side end of the piston rod 24.
  • the rod bushing 22 serves to receive the piston rod 24.
  • the rod bushing 22 also serves to linearly guide the piston rod 24 and the piston 26 connected to the piston rod 24.
  • the piston rod 24 or the piston 26 is linearly displaced in a first piston movement direction P1 when the pressure chamber 36 on the piston side is acted upon by the hydraulic fluid. Furthermore, the piston rod 24 or the piston 26 is linearly displaced in a second piston movement direction P2 when the pressure chamber 38 on the piston rod side is acted upon by the hydraulic fluid.
  • the first and second piston movement directions are P1, P2 essentially parallel to the longitudinal axis 30 of the double-acting hydraulic cylinder 10.
  • the first and second piston movement directions P1, P2 represent opposite piston movement directions of the double-acting hydraulic cylinder 10.
  • FIG 2 shows that the second cylinder tube 16 surrounds the first cylinder tube 14 at least in a section 41 .
  • this section 41 extends along the longitudinal axis 30 of the double-acting hydraulic cylinder 10.
  • the intermediate space 40 formed by the first and second cylinder tubes 14, 16 extends essentially within this section 41.
  • the intermediate space 40 extends essentially from the cylinder base 12 to the Groove 42 provided in the rod bushing 22.
  • the groove 42 corresponds in particular to a recess in the rod bushing 22, which extends from the intermediate space 40 to the pressure chamber 38 on the piston rod side.
  • the intermediate space 40, the recess 42 of the rod bushing 22 and the pressure chamber 38 on the piston rod side are connected to one another.
  • FIG 2 The dimension D1 shown is given by an outer surface 44 of the second cylinder tube 16 .
  • This dimension D1 corresponds to an installation space for the double-acting hydraulic cylinder 10.
  • figure 3 shows a schematic longitudinal sectional view along section line 48b, BB, in Figure 1b .
  • the first connection 32 for pressurizing the pressure chamber 36 on the piston side is clearly visible.
  • the first connection 32 comprises a first through-opening 33.
  • this first through-opening 33 extends from a lateral surface 62 of the cylinder base 12 to the pressure chamber 36 on the piston side.
  • the first through-opening 33 extends essentially perpendicularly to the lateral surface 62 of the Cylinder base 12.
  • the first connection 32 is used to connect a first connecting line 52. This first connecting line 52 is in figure 3 not shown.
  • Figure 4a shows a schematic longitudinal sectional view along section line 48c, CC, in Figure 1b .
  • the second connection 34 for pressurizing the pressure chamber 38 on the piston rod side is clearly visible.
  • the second connection 34 includes a second through-opening 35.
  • This second through-opening 35 preferably extends from a lateral surface 62 of the cylinder base 12 to the intermediate space 40 formed by the first and second cylinder tubes 14, 16.
  • the second through-opening extends, for example 35 from the gap 40 obliquely upwards.
  • the second terminal 34 is used to connect a second connecting line 54.
  • This second connecting line 54 is in Figure 4a not shown. According to Figure 1a to 4a are the second connection 34, the gap 40, the recess 42 of the rod bushing 22 and the pressure chamber 38 on the piston rod side are connected to one another.
  • Figure 4b shows a schematic representation of a piston-side end of the in Figure 1a shown double-acting hydraulic cylinder 10.
  • the first and second connection 32, 34 clearly visible.
  • the first port 32 extending through the cylinder base 12 is arranged, for example, in a central area of the double-acting hydraulic cylinder 10
  • the second port 34 extending through the cylinder base 12 is arranged, for example, in a lateral area of the double-acting hydraulic cylinder 10.
  • Both the first connection 32 and the second connection 34 can be provided on the piston-side end of the double-acting hydraulic cylinder 10 .
  • figure 5 shows an exemplary schematic diagram of a double-acting hydraulic cylinder 10, which is not covered by the claims.
  • the double-acting hydraulic cylinder 10 includes the double-acting hydraulic cylinder 10 only a single cylinder tube 14.
  • the double-acting hydraulic cylinder 10 according to the embodiment of FIG figure 5 not the second cylinder tube 16 of the double-acting hydraulic cylinder 10 according to the embodiment of Figure 1a .
  • the embodiment of figure 5 to another aspect of the present invention.
  • the double-acting hydraulic cylinder 10 shown comprises the piston 26 guided in the cylinder tube 14 and separating the pressure chamber 36 on the piston side from the pressure chamber 38 on the piston rod side.
  • the pressure chamber 36 , 38 on the piston side and the piston rod side are formed by the cylinder tube 14 .
  • a rod bushing 22 on the piston rod side is provided, which receives the piston rod 24 and guides it linearly.
  • the first and second port 32, 34 includes the double-acting hydraulic cylinder 10, the first and second port 32, 34.
  • the first connection 32 is used to apply a hydraulic fluid to the pressure chamber 36 on the piston side
  • the second connection 34 is used to apply the hydraulic fluid to the pressure chamber 38 on the piston rod side.
  • the first port 32 includes a first through hole 33
  • the second port 34 includes a second through hole 35 .
  • These first and second through-openings 33, 35 preferably extend completely through the piston rod 24.
  • the first and second through-openings 33, 35 extend essentially parallel to the longitudinal axis 30 of the double-acting hydraulic cylinder 10.
  • FIG figure 5 extends the first Through opening 33 from an end of the piston rod 24 facing away from the piston 26 through the piston rod 24 to an end of the piston rod 24 facing the piston 26. Furthermore, according to FIG figure 5 the second passage opening 35 from the end of the piston rod 24 facing away from the piston 26 through the piston rod 24 to the end of the piston rod 24 facing the piston 26.
  • the first through opening 33 extends further from the end of the piston rod 24 facing the piston 26 parallel to the longitudinal axis 30 of the double-acting hydraulic cylinder 10 and completely through the piston 26 to the pressure chamber 36 on the piston side figure 5 shown that the second passage opening 35 continues to be angled from the end of the piston rod 24 facing the piston 26 and partially extends through the piston 26 to the pressure chamber 38 on the piston rod side.
  • the pressure chambers 36 , 38 on the piston side and the piston rod side are pressurized with the hydraulic fluid via the first or second connection 32 , 34 provided in the piston rod 24 .
  • Figure 6a shows a schematic representation of a double-acting hydraulic cylinder 10 with a first connection 32 and a second connection 34 according to an exemplary embodiment.
  • the first and second connection 32, 34 are arranged on the cylinder base 12 of the double-acting hydraulic cylinder 10.
  • the first and second port 32, 34 are connected to a hydraulic unit 50.
  • First port 32 is preferably connected to an A port of hydraulic unit 50 via a first connecting line 52
  • second port 34 is connected to a B port of hydraulic unit 50 via a second connecting line 54 .
  • the A port of the hydraulic unit 50 is used to supply the first port 32 with a hydraulic fluid
  • the B port of the hydraulic unit 50 is used to supply the second port 34 with the hydraulic fluid.
  • the end of the double-acting hydraulic cylinder 10 on the piston rod side is connected to a unit 56 on the piston rod side.
  • the unit 56 on the piston rod side can be displaced in the first or second direction of piston movement P1, P2 with the aid of the double-acting hydraulic cylinder 10.
  • the installation space 58 for the double-acting hydraulic cylinder 10 is shown in particular.
  • the installation space 58 is in Figure 6a shown schematically by dashed lines.
  • the installation space 58 is essentially defined by the outer surface 44 of the second cylinder tube 16 .
  • the installation space 58 thus essentially corresponds to that in figure 2 shown dimension D1.
  • the installation space 58 for the double-acting hydraulic cylinder 10 according to the embodiment of Figure 6a relatively small compared to the prior art.
  • Figure 6b shows a schematic representation of a double-acting hydraulic cylinder 100 with a connection 114 on the B-side of the double-acting hydraulic cylinder 100.
  • connection 114 arranged on the piston rod-side end of the double-acting hydraulic cylinder 100 is shown.
  • connection 112 which is arranged on the piston-side end of the double-acting hydraulic cylinder 100, is in Figure 6b not shown.
  • These connections 112, 114 are connected to the A connection or B connection of a hydraulic unit 50 via two connecting lines 52, 54.
  • the installation space 128 for the double-acting hydraulic cylinder 100 according to Figure 6b is shown schematically by dashed lines.
  • the installation space 128 is essentially given by the lateral expansion of the surface of the cylinder tube 102 and the exposed banjo bolt 122 . So the in Figure 6b The installation space 128 shown according to the prior art is relatively large compared to the installation space 58 according to the embodiment of FIG Figure 6a .
  • Figure 7a shows a schematic longitudinal sectional view of a double-acting hydraulic cylinder 10 according to an embodiment.
  • the installation space 58 is shown.
  • the second connection 34 comprises an exposed hollow screw 60.
  • the exposed hollow screw 60 preferably extends through an annular eyelet 64 into the second through opening 35.
  • the exposed banjo bolt 60 is located on the cylinder base 12 .
  • exposed hollow screw 60 for connecting the second connecting line 54.
  • dimension D1 corresponds to the outside diameter of the second cylinder tube 16
  • dimension D2 corresponds to the inside diameter of the first cylinder tube 14
  • dimension D3 corresponds to the wall thickness of the first and second cylinder tubes 14,
  • dimension D4 corresponds to the wall thickness of the first cylinder tube 14.
  • dimension D1 is 50 mm
  • dimension D2 is 35 mm
  • dimension D3 is 7.5 mm
  • dimension D4 is 3.5 mm.
  • Figure 7b shows a schematic longitudinal sectional view of a double-acting hydraulic cylinder 100 according to the prior art.
  • the installation space 128 is clearly visible.
  • dimensions L1 to L3 are shown.
  • the dimension L2 corresponds to the inside diameter of the cylinder tube 102, while the dimension L3 corresponds to the wall thickness of the cylinder tube 102.
  • dimension L1 is 20mm
  • dimension L2 is 35mm
  • dimension L3 is 3.5mm.
  • the sketched, cylindrical installation space 58 can be maintained by skillful placement of the second connection 34 .
  • the determining outer diameter D1 of the lateral surface 44 is only 50 mm.
  • This outside diameter D1 of the lateral surface 44 is at most 7.5 mm larger than the piston diameter or inside diameter D2 of the first cylinder tube 14. With other piston diameters and comparable pressure, the dimension 7.5 remains constant.
  • connection 114 or the exposed banjo bolt 122 is typically 23.5 mm beyond the piston diameter or inner diameter L2 of the cylinder tube 102 . Because of the drawn thread depth for a typically used hollow screw M8x1, the known solution cannot be optimized like the solution according to the invention.
  • Embodiments of the present invention provide a space-saving, safe supply of energy within a double-acting hydraulic cylinder 10 and mounting the A and B ports 32, 34 on the cylinder housing 12 close to each other.
  • the supply of the hydraulic fluid can also be realized via the piston rod 24, as is the case in the exemplary embodiment of FIG figure 5 is shown.
  • two bores 33, 35 can be made in the piston rod 24 or several tubes can be slid into one another in order to obtain two separate, oil-carrying spaces.
  • the A port 32 and the B port 34 are located at the outer end of the piston rod 24 .
  • This in figure 5 shown embodiment has compared to in Figure 1a shown embodiment has the disadvantage that the cross section of the piston rod 24 is weakened by the oil bores 33, 35.
  • arising from the construction after figure 5 compared to the structure after Figure 1a relatively high costs due to the holes 33, 35.
  • the double-acting hydraulic cylinder can also be designed as a synchronous cylinder or tandem cylinder.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP16736882.8A 2015-07-14 2016-07-11 Doppeltwirkender hydraulikzylinder Active EP3322903B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015111403.8A DE102015111403A1 (de) 2015-07-14 2015-07-14 Doppeltwirkender Hydraulikzylinder
PCT/EP2016/066438 WO2017009291A1 (de) 2015-07-14 2016-07-11 Doppeltwirkender hydraulikzylinder

Publications (2)

Publication Number Publication Date
EP3322903A1 EP3322903A1 (de) 2018-05-23
EP3322903B1 true EP3322903B1 (de) 2022-03-02

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Application Number Title Priority Date Filing Date
EP16736882.8A Active EP3322903B1 (de) 2015-07-14 2016-07-11 Doppeltwirkender hydraulikzylinder

Country Status (9)

Country Link
US (1) US10514050B2 (ja)
EP (1) EP3322903B1 (ja)
JP (1) JP6945519B2 (ja)
KR (1) KR20180030591A (ja)
CN (1) CN107923421B (ja)
BR (1) BR112018000735A2 (ja)
DE (1) DE102015111403A1 (ja)
RU (1) RU2018105075A (ja)
WO (1) WO2017009291A1 (ja)

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DE102017105015B4 (de) * 2017-03-09 2019-10-10 Tyrolon-Schulnig Gmbh Greif- und Transportvorrichtung
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US10514050B2 (en) 2019-12-24
JP2018520322A (ja) 2018-07-26
US20180156247A1 (en) 2018-06-07
DE102015111403A1 (de) 2017-01-19
KR20180030591A (ko) 2018-03-23
JP6945519B2 (ja) 2021-10-06
EP3322903A1 (de) 2018-05-23
CN107923421A (zh) 2018-04-17
BR112018000735A2 (pt) 2018-09-04
RU2018105075A (ru) 2019-08-14
WO2017009291A1 (de) 2017-01-19

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