EP1435461A1 - Pneumatikzylinder mit Dämpfungsmitteln - Google Patents

Pneumatikzylinder mit Dämpfungsmitteln Download PDF

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Publication number
EP1435461A1
EP1435461A1 EP03104805A EP03104805A EP1435461A1 EP 1435461 A1 EP1435461 A1 EP 1435461A1 EP 03104805 A EP03104805 A EP 03104805A EP 03104805 A EP03104805 A EP 03104805A EP 1435461 A1 EP1435461 A1 EP 1435461A1
Authority
EP
European Patent Office
Prior art keywords
piston
cushioning
pressure chamber
pneumatic cylinder
nozzle
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Withdrawn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
EP03104805A
Other languages
English (en)
French (fr)
Inventor
Staffan Hedlund
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.)
Bosch Rexroth Teknik AB
Original Assignee
Bosch Rexroth Teknik AB
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 Bosch Rexroth Teknik AB filed Critical Bosch Rexroth Teknik AB
Publication of EP1435461A1 publication Critical patent/EP1435461A1/de
Withdrawn legal-status Critical Current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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/224—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston which closes off fluid outlets in the cylinder bore by its own movement

Definitions

  • the present invention relates to a pneumatic cylinder comprising a cylinder tube, a piston sliding within the cylinder tube, at least one piston packing ring disposed on the outer peripheral surface of the piston for defining at least one pressure chamber, at least one port for supplying and discharging compressed air to and from said pressure chamber separated by the piston, a respective air outlet for communicating with the pressure chamber associated with a port and positioned with an axial cushioning distance (X) to the end of the cylinder tube, and cushioning means for stopping the piston in a cushioning manner by restraining the discharged air flow from the pressure chamber.
  • X axial cushioning distance
  • the US 5,307,729 discloses a pneumatic cylinder with such cushioning means.
  • An adjusting screw is arranged on the end cover of the pneumatic cylinder for simultaneous setting of throttle means out from the cylinder for regulating the cushioning as well as the velocity.
  • the end cover is provided with a cushion sleeve serving as a main inlet/outlet channel and extending into the pressure chamber.
  • the piston is provided with a recess having a seal for the cooperating with the cushion sleeve.
  • the bypass channel is arranged with a radial distance from the central main inlet/outlet channel.
  • the port serves also as inlet channel when the piston is moving in the opposite direction. Since the cushioning means are completely integrated into the end cover, the known pneumatic cylinder is quite oblong.
  • the GB 2 347 176 shows a short pneumatic cylinder wherein the cushioning means are integrated into the wall section of the cylinder tube.
  • the cushioning means comprising discharge outlets and check valves.
  • To move the inner piston compressed air initially enters the pressure chamber via an outer port through a bypass channel, a check valve and a first bore.
  • a piston ring uncovers a second bore, so allowing unrestricted air flow from said port to the pressure chamber.
  • the restricted outflow serves to decelerate the piston.
  • this construction allows a short design but a thick-walled cylinder tube is needed for placing the cushioning means.
  • the cushioning means of the present invention comprise at least one channel with a cushioning nozzle arranged in the piston in order to discharge comcompressed air within the pressure chamber only through the cushioning nozzle when the piston packing ring passes over the air outlet on the discharge side just before the piston reaches the end of its stroke, wherein the piston channel connects the pressure chamber with the air outlet.
  • the piston channel itself comprises the function of the cushioning nozzle.
  • a separate cushioning nozzle part is not needed.
  • the pneumatic cylinder according to the present invention does not need a long cushion sleeve inside the pressure chamber and a long space for inserting the cushion sleeve, so that the length of the cylinder can be reduced, which enables the air cylinder to be miniaturized.
  • most of the simple cushioning means are integrated in the piston, a thin-walled cylinder design is realized.
  • an additional elastomeric cushioning disc is disposed on the inner side of the cylinder tube's end cover.
  • the elastomeric cushioning disc serves to absorb hard strokes, especially for pneumatic cylinders with a high piston speed.
  • each port is connected to an outer check choke valve for speed regulating the piston movement.
  • a block to which that speed-regulating means are assembled may be either fixed to the pneumatic cylinder or arranged in a place separated from the pneumatic cylinder to be connected to each other by piping.
  • a filter element is placed between the cushioning nozzle and the pressure chamber.
  • the filter element consists of porous ceramic or metal material whereby said filter element is changeable disposed inside the piston channel.
  • the at least one piston packing ring has the additional function of a non-return valve in order to speed up the piston when supplying compressed air to the pressure chamber.
  • the at least one cushioning nozzle is directly integrated in the piston packing ring forming a bore through the piston packing ring.
  • a separate piston channel through the piston is redundant.
  • the pneumatic cylinder according to Fig. 1 includes a cylinder tube 1, both ends thereof being closed by end covers 2a, 2b, respectively, a piston 3 which reciprocates within the cylinder tube 1 sliding air-tightly, and a piston rod 4 connected to the piston 3.
  • ports 5a, 5b for supplying and discharging comcompressed air are disposed, respectively, with an axial cushioning distance X.
  • These ports 5a, 5b communicate with a pair of pressure chambers 6a, 6b defined at both sides of the piston 3, via air outlets 7a, 7b, respectively.
  • the piston 3 is driven to be reciprocated in the cylinder tube 1 by supplying and discharging comcompressed air to/from the pressure chambers 6a and 6b from/to the ports 5a, 5b via the air outlets 7a, 7b.
  • Ports 5a, 5b are connected to outer check choke valves 14a and 14b, respectively, for speed regulating the piston movement when supplying the pressure chambers 6a or 6b with compressed air.
  • cushioning means are provided for stopping the piston 3 in a cushioning manner by restraining the flow of discharged air from the pressure chambers 6a, 6b, respectively.
  • the cushioning means comprise - referring to on side of the pneumatic cylinder only - a cushioning nozzle 8a (see detail A) inserted in a 90°-offset piston channel 9a.
  • An additional filter element 12a is placed between the cushioning nozzle 8a and the pressure chamber 6a in order to avoid a pollution of the cushioning nozzle 8a.
  • the cushioning nozzles 8a, 8b are directly integrated in the respective piston packing rings 13a, 13b forming bores through the piston packing rings 13a and 13b.
  • Both piston packing rings 13a, 13b are shaped as lip sealing rings fastened on the piston 3 in order to complete a non-return valve function for speed up the piston when supplying compressed air to the pressure chamber 6a or 6b.
  • a middle sealing ring 15 between both piston packing rings 13a and 13b is shaped as an O-ring.
  • cushioning means it is not needed to form a long cushioning sleeve inside the pressure chamber fixed on the piston or on the end cover. Furthermore, a thin-walled cylinder design is possible.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP03104805A 2002-12-30 2003-12-18 Pneumatikzylinder mit Dämpfungsmitteln Withdrawn EP1435461A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10261412A DE10261412A1 (de) 2002-12-30 2002-12-30 Pneumatikzylinder mit Dämpfungsmitteln
DE10261412 2002-12-30

Publications (1)

Publication Number Publication Date
EP1435461A1 true EP1435461A1 (de) 2004-07-07

Family

ID=32478061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03104805A Withdrawn EP1435461A1 (de) 2002-12-30 2003-12-18 Pneumatikzylinder mit Dämpfungsmitteln

Country Status (2)

Country Link
EP (1) EP1435461A1 (de)
DE (1) DE10261412A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009147405A1 (en) * 2008-06-06 2009-12-10 Isentropic Limited Fluid servo and applications
CN102454662A (zh) * 2010-11-06 2012-05-16 费斯托股份有限两合公司 带有终端阻尼装置的流体操纵的直线驱动机构
CN103148053A (zh) * 2013-03-04 2013-06-12 长沙理工大学 一种混凝土泵用泵送油缸的行程控制节能缓冲法
CN104712610A (zh) * 2013-12-13 2015-06-17 航宇救生装备有限公司 带缓冲装置的高速气缸
US11067104B1 (en) 2020-11-16 2021-07-20 Caterpillar Inc. Integrated cylinder piston and bearing as a hydraulic cushion
EP3882135A1 (de) * 2020-03-20 2021-09-22 Airbus Operations Limited Aktuator für eine flugzeugfahrwerksanordnung
CN113685393A (zh) * 2021-07-12 2021-11-23 浙江匠心液压科技有限公司 一种带缓冲结构的起升油缸

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013003622U1 (de) * 2013-04-18 2014-07-21 Bümach Engineering International B.V. Abschnittsgedämpfter Plungerzylinder

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592106A (en) * 1969-06-25 1971-07-13 Cascade Corp Ram with cushioned piston stroke
US3626812A (en) * 1970-07-09 1971-12-14 Bucyrus Erie Co Cylinder-cushioning arrangement
US3961564A (en) * 1973-03-05 1976-06-08 Parker-Hannifin Corporation Fluid motor and combination bumper and sealing ring therefor
US4257499A (en) * 1977-03-30 1981-03-24 Deschner Richard E Hydraulic cartridge for improved motion control
US4455923A (en) * 1981-09-19 1984-06-26 Pfaff Industriemaschinen Gmbh Air cylinder with end position damping
US5193433A (en) * 1989-05-24 1993-03-16 Ab Mecman Piston sealing and dampening device
DE29700256U1 (de) * 1996-03-01 1997-03-13 Karl Schaeff GmbH & Co. Maschinenfabrik, 74595 Langenburg System-Hydraulikzylinder mit oder ohne Endlagendämpfung
DE19903511A1 (de) * 1999-01-29 2000-08-03 Zahnradfabrik Friedrichshafen Stellmotor mit einer Abschalteinrichtung
US6186043B1 (en) * 1999-04-05 2001-02-13 Deere & Company Cushion hydraulic cylinder
US6279451B1 (en) * 1998-11-06 2001-08-28 Smc Corporation Air cylinder with cushion mechanism

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2182672B1 (de) * 1972-05-03 1975-03-21 Poclain Sa
DE2712669A1 (de) * 1977-03-23 1978-09-28 Volkswagenwerk Ag Anordnung mit einem pneumatik- zylinder
DE4035286C2 (de) * 1990-11-07 1993-12-16 Helmut Woerner Anschlag mit einer Dämpfungseinrichtung
SE467424B (sv) * 1990-11-09 1992-07-13 Mecman Ab Anordning foer aendlaegesdaempning och hastighetsreglering av roerelsen hos en kolv i en tryckmediecylinder

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592106A (en) * 1969-06-25 1971-07-13 Cascade Corp Ram with cushioned piston stroke
US3626812A (en) * 1970-07-09 1971-12-14 Bucyrus Erie Co Cylinder-cushioning arrangement
US3961564A (en) * 1973-03-05 1976-06-08 Parker-Hannifin Corporation Fluid motor and combination bumper and sealing ring therefor
US4257499A (en) * 1977-03-30 1981-03-24 Deschner Richard E Hydraulic cartridge for improved motion control
US4455923A (en) * 1981-09-19 1984-06-26 Pfaff Industriemaschinen Gmbh Air cylinder with end position damping
US5193433A (en) * 1989-05-24 1993-03-16 Ab Mecman Piston sealing and dampening device
DE29700256U1 (de) * 1996-03-01 1997-03-13 Karl Schaeff GmbH & Co. Maschinenfabrik, 74595 Langenburg System-Hydraulikzylinder mit oder ohne Endlagendämpfung
US6279451B1 (en) * 1998-11-06 2001-08-28 Smc Corporation Air cylinder with cushion mechanism
DE19903511A1 (de) * 1999-01-29 2000-08-03 Zahnradfabrik Friedrichshafen Stellmotor mit einer Abschalteinrichtung
US6186043B1 (en) * 1999-04-05 2001-02-13 Deere & Company Cushion hydraulic cylinder

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011522193A (ja) * 2008-06-06 2011-07-28 アイゼントロピック リミテッド 流体サーボ及び用途
CN102057168B (zh) * 2008-06-06 2013-07-10 等熵有限公司 流体伺服及应用
US8863641B2 (en) 2008-06-06 2014-10-21 Isentropic Ltd. Fluid servo and applications
WO2009147405A1 (en) * 2008-06-06 2009-12-10 Isentropic Limited Fluid servo and applications
CN102454662B (zh) * 2010-11-06 2015-07-01 费斯托股份有限两合公司 带有终端阻尼装置的流体操纵的直线驱动机构
CN102454662A (zh) * 2010-11-06 2012-05-16 费斯托股份有限两合公司 带有终端阻尼装置的流体操纵的直线驱动机构
CN103148053A (zh) * 2013-03-04 2013-06-12 长沙理工大学 一种混凝土泵用泵送油缸的行程控制节能缓冲法
CN104712610A (zh) * 2013-12-13 2015-06-17 航宇救生装备有限公司 带缓冲装置的高速气缸
EP3882135A1 (de) * 2020-03-20 2021-09-22 Airbus Operations Limited Aktuator für eine flugzeugfahrwerksanordnung
US11820495B2 (en) 2020-03-20 2023-11-21 Airbus Operations Limited Actuator for an aircraft landing gear assembly
EP4386214A3 (de) * 2020-03-20 2024-08-07 Airbus Operations Limited Aktuator für eine flugzeugfahrwerkanordnung
US11067104B1 (en) 2020-11-16 2021-07-20 Caterpillar Inc. Integrated cylinder piston and bearing as a hydraulic cushion
CN113685393A (zh) * 2021-07-12 2021-11-23 浙江匠心液压科技有限公司 一种带缓冲结构的起升油缸
CN113685393B (zh) * 2021-07-12 2024-02-23 浙江匠心液压科技有限公司 一种带缓冲结构的起升油缸

Also Published As

Publication number Publication date
DE10261412A1 (de) 2004-07-22

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