EP2202413A1 - Entraînement pneumatique à équilibrage de pression - Google Patents

Entraînement pneumatique à équilibrage de pression Download PDF

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Publication number
EP2202413A1
EP2202413A1 EP08022320A EP08022320A EP2202413A1 EP 2202413 A1 EP2202413 A1 EP 2202413A1 EP 08022320 A EP08022320 A EP 08022320A EP 08022320 A EP08022320 A EP 08022320A EP 2202413 A1 EP2202413 A1 EP 2202413A1
Authority
EP
European Patent Office
Prior art keywords
piston
movement
rod
pistons
housing
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Withdrawn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
EP08022320A
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German (de)
English (en)
Inventor
Francois Morand
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP08022320A priority Critical patent/EP2202413A1/fr
Publication of EP2202413A1 publication Critical patent/EP2202413A1/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Withdrawn legal-status Critical Current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
    • F15B15/08—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
    • F15B15/1447—Pistons; Piston to piston rod assemblies

Definitions

  • the present invention relates to a pneumatic cylinder.
  • pneumatic cylinders are known from the prior art for a long time. These pneumatic cylinders usually have a housing in the interior of which a piston is movable in a direction of movement, wherein this movement is generated by air pressure.
  • the pistons of these pneumatic cylinders and thus also the piston rods are usually movable between two end positions, wherein these end positions are given by the fact that the pistons abut attacks on these points within the cylinder.
  • pneumatic cylinders are required which allow a given stroke and retraction within a predetermined range at both stroke end positions, and preferably also when the pneumatic cylinder is pressurized.
  • the present invention is therefore based on the object to provide a cylinder available at the end positions by a certain path length withdraws, however, a withdrawal effecting this arrangement should be integrated into the cylinder itself.
  • a pneumatic drive according to the invention has a housing and a rod element movable relative to this housing in a first direction of movement and in a direction of movement opposite to the first direction of movement.
  • a receiving space is provided within the housing and a first arranged in this receiving space piston which is movable relative to this receiving space in both directions of movement, wherein a movement of this piston and the rod member are at least temporarily coupled together, and a first feed opening to the receiving space with To pressurize a gaseous medium.
  • the drive has a second piston, which is arranged in the receiving space and is movable relative to the receiving space in both directions of movement, wherein the first piston and the second piston in the directions of movement are mutually displaceable.
  • the rod element is in particular a piston rod, which in turn can serve as a drive for further elements.
  • the drive can be moved beyond its respective end positions or at least one end position also still by a certain amount, in which case it can in particular automatically return to its final position.
  • a movement of the second piston and the rod-shaped body are at least temporarily coupled to each other, in particular during the movement of the rod-shaped body in exactly one direction of movement.
  • the rod-shaped body serves in particular as a drive element of a machine.
  • a first stop element is provided in the housing, which limits a movement of the first piston in the first direction of movement. This is determined by this stop element, a first end position of the first piston, but preferably not determined by this stop the end position of the piston rod, but this can be offset over a certain amount x still beyond the determined by the stop element end position of the first piston.
  • a second stop element is arranged in the housing, which limits the movement of the second piston in the second direction of movement.
  • the housing has a second supply opening spaced from the first supply opening in order to supply the receiving space with the gaseous medium.
  • the first and the second piston are always arranged between the two feed openings.
  • the feed openings are at least partially provided in said stop elements.
  • the first piston and the second piston are arranged on a common carrier and this common carrier in turn is preferably fixed relative to the rod element.
  • the two pistons are particularly preferably arranged to be movable relative to the said carrier, which may likewise be designed as a rod.
  • the same areas, in particular equal areas are arranged on the two sides outside the piston, ie in particular within the receiving space. In this way it can be achieved that the forces acting on both pistons Forces are equal.
  • the housing is preferably a cylinder and in particular a cylinder with a passage opening for the rod-shaped body.
  • the two pistons can each slip or slide on the above-mentioned carrier within a distance of x millimeters. This distance corresponds to the distance between the respective retraction of the cylinder at the two end positions of the stroke.
  • the drive has a further rod-shaped body, which is also movable in said directions, wherein the two pistons between the first rod-shaped body and the second rod-shaped body are arranged.
  • the said further rod-shaped body is preferably also guided within the housing.
  • the rod-shaped bodies have a larger cross section than the carrier on which the pistons are arranged. It would also be possible that the rod-shaped body and the carrier are integrally formed.
  • the drive has at least one biasing means, which forces the two pistons apart.
  • the biasing means is a spring means which urges the two pistons apart.
  • an elastic element such as a spring, is particularly preferably provided between the two pistons so as to hold the two pistons at a distance of x millimeters with respect to each other. These x millimeters also correspond to the geometric difference between the stop and the beyond fully extended state of the cylinder.
  • the first piston is sealed off from the receiving space, in particular an inner wall of the receiving space, with a first sealing device, which allows the gaseous medium to pass substantially only in the first direction of movement.
  • this sealing means is a lip seal or labyrinth seal disposed on the respective piston in a manner in which air flows through the piston in one direction but not in the other direction.
  • these sealing devices are particularly preferably arranged so that the gas, or the air, can pass through them in a direction of the respective other piston, but not in the opposite direction. In this way, as will be explained in more detail below, a displacement of the piston rod beyond the end position can be achieved.
  • the drive has a discharge device for discharging the gaseous medium from the housing 2. In this way it is possible to lower the nominal pressure within the housing 2 or cylinder.
  • FIG. 1 shows a schematic representation of a pneumatic drive according to the invention 1.
  • This drive 1 has a housing 2, which is also referred to in the following as a lifting cylinder.
  • a receiving space 6 is formed, within which two pistons 12 and 8 are movable in directions of movement R1 and R2.
  • first rod member 4 which protrudes from the housing at least temporarily and another rod member 32 which protrudes in the opposite direction from the housing 2.
  • These two rod elements are formed here the same and between the two rod elements 4 and 32, the two pistons 12 and 8 are added.
  • the two rod elements 4 and 32 are each sealed by means of sealing means 42 and 44 relative to the housing 2.
  • the housing 2 and the cylinder is designed here as a through cylinder.
  • the reference numeral 22 refers to a supply port or a supply channel in order to supply the receiving chamber 6 with a flowable and in particular gaseous medium.
  • a further feed opening 24 is arranged on the other end side of the housing in order to supply the gaseous medium to the receiving space from this side.
  • the reference numeral 14 refers to a first stop member, which represents an end position for the first piston 8 and the reference numeral 16 to a second stop member, which forms an end position for the second piston 12.
  • first stop member which represents an end position for the first piston 8
  • second stop member which forms an end position for the second piston 12.
  • the two pistons 8 and 12 initially travel in the direction of the arrow R1.
  • the piston 8 is sealed by means of a first sealing device, such as here a lip-shaped annular seal 34 with respect to an inner wall of the receiving space or of the housing 2.
  • the first sealing device 34 is such that the gaseous medium in the direction R1 within the receiving space 6 can pass this sealing device 34 past.
  • a corresponding second sealing device 36 is also arranged on the second piston 12. This second sealing device 36 is designed such that the gaseous medium can pass in the direction R2 but not in the direction R1.
  • the reference number 52 refers to sealing devices (in the form of O-ring seals) with which the pistons are sealed in the directions opposite to the carrier 20.
  • the two pistons 8, 12 are urged apart by the suspension device 10 such that the distance between the two pistons 8, 12 x.
  • This maximum distance x is also determined by the length of the carrier 20
  • the carrier 20 and the two rod-shaped bodies 4, 32 are rigidly connected to each other, but it would also be possible for the carrier 20 and the two rod-shaped bodies to be displaceable against each other in the directions R1, R2.
  • the carrier 20 could telescope into one or the two rod-shaped bodies 4, 32.
  • FIG. 2 shows a more detailed representation of in FIG. 1 shown device.
  • the two sealing devices 34 and 36 which are each designed such that they allow the gaseous medium to pass through in each case in a direction in which the respective other piston is located.
  • Reference numeral 26 denotes a magnet detectable by a sensor (not shown). In this way, the end positions of the piston can be determined.
  • Reference numerals 46 and 48 refer to guide bodies or guide sleeves for guiding the rod-shaped body 4 and the further rod-shaped body 32
  • the housing is here, as mentioned above, formed as a passage housing and has on both sides, i. on the left and right with respect to the two pistons 8 and 12 each have the same areas. Also, the two pistons 8 and 12, at least in the region of their sealing means 34, 36 each designed the same and also have the same areas, so that in this particular application, the pressure forces acting on the piston are the same.
  • the housing has a total of through holes 54, wherein in the sections of these through holes 54 each of the two rod-shaped body 4 and 32 extend.
  • the further rod-shaped body is always, i. regardless of its position of movement inside the housing 2 out.
  • the two sealing devices 34, 36 could here as a lip seal, which in a However, it would also be possible that seals are provided which allow passage of air in both directions and then preferably a one-way valve is provided. In any case, the sealing mechanism always allows the air to pass only in one direction, namely from the respective front chamber 6a or rear chamber 6b into the region 6c between the two pistons 8, 12.
  • the suspension device 10 other elastic elements could also be provided push the two pistons 8 and 12 apart. Also spring elements could be provided, which bias the two pistons 8 and 12 respectively in the direction of the two rod-shaped body 4 and 32.
  • FIGS. 4a-4h show eight different operating situations of a pneumatic drive according to the invention. Only a few reference numbers have been inserted for simplicity.
  • the pneumatic drive is in the position I shown (the positions respectively refer to the end 4a of the first rod-shaped body in the direction R1).
  • Position 1 has been reached since the first piston 8 is now in contact with the first stop element 14. However, the two pistons 8 and 12 are still spaced apart by a distance x.
  • the present arrangement can also be modified to the effect that, for example, only at one end of the lifting movement of the additional distance x is generated, for example by appropriate modification of the sealing means.
  • the distance x shown could also be larger or smaller as in the FIGS. 4a-4h indicated.
  • the housing 2 and the cylinder are a passage cylinder for the rod-shaped bodies having the same portions on both sides of the pistons and also the same cylinder forces.
  • the above-mentioned maximum distance x between the two pistons also sets the range by which the rod-shaped body 4 can still be further moved or retracted at its two end positions.
  • the present invention thus allows a compact solution, which is installed directly in the cylinder.
  • This solution is also based on a pneumatic and mechanical system.
  • this solution allows high precision because of the four mechanical stop positions for the four position I - IV.
  • the system described also operates at different pressures (and also in the case of an increasing pressure). More specifically, the solution according to the invention remains efficient at all pressures and at the same time the system or the respective pistons can remain under pressure (between the two pistons 8, 12).
  • the present invention can be used in particular in machine tools or in transmissions application and therefore the invention is also directed to a machine tool or a transmission with a pneumatic drive of the type described here.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP08022320A 2008-12-23 2008-12-23 Entraînement pneumatique à équilibrage de pression Withdrawn EP2202413A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08022320A EP2202413A1 (fr) 2008-12-23 2008-12-23 Entraînement pneumatique à équilibrage de pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08022320A EP2202413A1 (fr) 2008-12-23 2008-12-23 Entraînement pneumatique à équilibrage de pression

Publications (1)

Publication Number Publication Date
EP2202413A1 true EP2202413A1 (fr) 2010-06-30

Family

ID=40578853

Family Applications (1)

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EP08022320A Withdrawn EP2202413A1 (fr) 2008-12-23 2008-12-23 Entraînement pneumatique à équilibrage de pression

Country Status (1)

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EP (1) EP2202413A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2503187A1 (fr) * 2011-03-25 2012-09-26 NAF Neunkirchener Achsenfabrik AG Dispositif d'entraînement pour un engin automobile
EP2503188A1 (fr) * 2011-03-25 2012-09-26 NAF Neunkirchener Achsenfabrik AG Cylindre de commutation pour un dispositif d'entraînement, notamment pour un engin automobile, dispositif d'entraînement, machine de travail et son procédé de fonctionnement dans ledit engin.
CN108591162A (zh) * 2018-05-16 2018-09-28 芜湖市艾德森自动化设备有限公司 一种新型液压缸用复合活塞结构
CN117048009A (zh) * 2023-08-18 2023-11-14 河北农业大学 一种石墨烯高分子复合材料的高效挤出设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS484203U (fr) * 1971-06-14 1973-01-18
JPS5298092U (fr) * 1976-01-21 1977-07-23
JPS53115290U (fr) * 1977-02-23 1978-09-13
US4205584A (en) 1977-04-16 1980-06-03 Dr.-Ing. Reiner Foerst Gmbh Tuning device for musical instruments
US4205594A (en) * 1977-08-08 1980-06-03 Burke Martin F Fluid operated apparatus
JPS55105606U (fr) * 1979-01-19 1980-07-23

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS484203U (fr) * 1971-06-14 1973-01-18
JPS5298092U (fr) * 1976-01-21 1977-07-23
JPS53115290U (fr) * 1977-02-23 1978-09-13
US4205584A (en) 1977-04-16 1980-06-03 Dr.-Ing. Reiner Foerst Gmbh Tuning device for musical instruments
US4205594A (en) * 1977-08-08 1980-06-03 Burke Martin F Fluid operated apparatus
JPS55105606U (fr) * 1979-01-19 1980-07-23

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2503187A1 (fr) * 2011-03-25 2012-09-26 NAF Neunkirchener Achsenfabrik AG Dispositif d'entraînement pour un engin automobile
EP2503188A1 (fr) * 2011-03-25 2012-09-26 NAF Neunkirchener Achsenfabrik AG Cylindre de commutation pour un dispositif d'entraînement, notamment pour un engin automobile, dispositif d'entraînement, machine de travail et son procédé de fonctionnement dans ledit engin.
CN102691690A (zh) * 2011-03-25 2012-09-26 纳夫诺因基兴阿奇森法布瑞克有限公司 控制缸、驱动装置、操作机器以及运行操作机器的方法
WO2012130639A1 (fr) * 2011-03-25 2012-10-04 Naf Neunkirchener Achsenfabrik Ag Dispositif d'entraînement pour engin de travail automoteur et procédé correspondant
CN103328860A (zh) * 2011-03-25 2013-09-25 纳夫诺因基兴阿奇森法布瑞克有限公司 用于汽车加工机器的驱动装置
CN103328860B (zh) * 2011-03-25 2016-04-06 纳夫诺因基兴阿奇森法布瑞克有限公司 用于汽车加工机器的驱动装置
US9353841B2 (en) 2011-03-25 2016-05-31 Naf Neunkirchener Achsenfabrik Ag Drive device for a self-propelled machine and corresponding method
CN102691690B (zh) * 2011-03-25 2016-08-17 纳夫诺因基兴阿奇森法布瑞克有限公司 控制缸、驱动装置、操作机器以及运行操作机器的方法
CN108591162A (zh) * 2018-05-16 2018-09-28 芜湖市艾德森自动化设备有限公司 一种新型液压缸用复合活塞结构
CN117048009A (zh) * 2023-08-18 2023-11-14 河北农业大学 一种石墨烯高分子复合材料的高效挤出设备
CN117048009B (zh) * 2023-08-18 2024-03-05 青岛新材料科技工业园发展有限公司 一种石墨烯高分子复合材料的高效挤出设备

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