EP0377529A1 - Druckmittelbetätigte Kolben-Zylinder-Einheit - Google Patents

Druckmittelbetätigte Kolben-Zylinder-Einheit Download PDF

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Publication number
EP0377529A1
EP0377529A1 EP90400007A EP90400007A EP0377529A1 EP 0377529 A1 EP0377529 A1 EP 0377529A1 EP 90400007 A EP90400007 A EP 90400007A EP 90400007 A EP90400007 A EP 90400007A EP 0377529 A1 EP0377529 A1 EP 0377529A1
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EP
European Patent Office
Prior art keywords
piston
cylinder
flow channel
fluid
cavity
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Withdrawn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
EP90400007A
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English (en)
French (fr)
Inventor
Roger Roux
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0377529A1 publication Critical patent/EP0377529A1/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Withdrawn legal-status Critical Current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
    • F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position

Definitions

  • the present invention relates to a fluid actuating cylinder, for example hydraulic or pneumatic.
  • the pressure of the actuating fluid is varied.
  • This way of proceeding requires the provision of fluid supply systems for the cylinders comprising control means adapted to be able to make these variations.
  • the present invention proposes an actuating cylinder which makes it possible to vary the speed of movement of its piston relative to its cylinder without auxiliary control means.
  • the actuating cylinder of the invention comprises a cylinder of which a piston is longitudinally movable and comprises between this piston and at least one radial wall at the end of the cylinder a fluid chamber and fluid flow means connected to this bedroom.
  • said flow means comprise means for limiting the flow of the fluid when the piston moves, at least in one direction, over part of its stroke.
  • said limiting means preferably act when the piston moves over part of its stroke situated on the side of said radial end wall of the cylinder.
  • said flow means can advantageously comprise means making it possible to avoid said limitation means when the piston moves in its other direction.
  • These means making it possible to avoid the limiting means preferably comprise a valve subjected to the action of a spring.
  • said radial end wall of said cylinder is provided with a longitudinal projecting part engaged in a cavity of the piston and having a main flow canan for the fluid emerging laterally, so that on part of the stroke of the piston, the interior wall of the cavity of the latter is opposite the peripheral opening of said main flow channel, the space extending between this interior wall of the piston cavity and the wall peripheral of said projecting part being such that, on said stroke portion of the piston, the flow of fluid is limited relative to its flow when the piston is on its other stroke portion.
  • the piston cavity preferably comprises a front part constituting said interior wall and, at the bottom, an interior chamber connected to said fluid chamber by a channel formed in the piston.
  • said projecting part preferably comprises a secondary flow channel extending said main flow channel and opening into said interior chamber of the piston, at least when said interior wall of the cavity of the piston is opposite. -vis the peripheral opening of said main flow channel, a valve preventing the fluid from flowing from the interior chamber of the piston cavity to the main flow channel.
  • a ring is mounted in the front part of the cavity of the piston, this ring forming said interior wall of the cavity.
  • This ring can advantageously be mounted radially movable.
  • the piston preferably carries, at its longitudinal ends, friction rings in said cylinder.
  • the cylinder carries a toothed wheel engaged with a longitudinal rack formed on the piston in order to cause this wheel to rotate during the longitudinal displacement of the piston.
  • the actuating cylinder shown in the figures and generally identified by the reference 1 comprises a cylinder generally identified by the reference 2.
  • This cylinder comprises a central cylindrical part 3 as well as two cylindrical end parts 4 and 5 screwed into the central part 3.
  • Radial walls 6 and 7 are screwed on the ends of the cylindrical end parts 4 and 5 of the cylinder 2.
  • a piston 8 In the cylinder 2 is mounted, longitudinally movable, a piston 8, thus forming on either side of the fluid chambers 9 and 10.
  • friction rings 11 and 12 and seals 13 and 14 which bear against the cylindrical inner wall of the cylindrical end parts 4 and 5 of the cylinder 2.
  • the cylinder 1 also comprises, inside and on either side of the piston 8, flow means for the fluid, generally identified by the references 15 and 15 a , which allow the arrival and the fluid outlet in the chambers 9 and 10, through the radial end walls 6 and 7.
  • the means 15 and 15 a are identical but mounted in opposite directions.
  • the flow means 15 comprises a longitudinal projecting part 16, one end of which is screwed into an axial passage passing through 17 of the radial end wall 6 of the cylinder 2, this part being cylindrical.
  • the longitudinal projecting part 16 is engaged in a cylindrical longitudinal cavity 18 of the piston 8.
  • a ring 19 which surrounds the longitudinal projecting part 16, providing between they have an annular space 20, this ring being held on the one hand by a shoulder 21 provided in the cavity 18 and on the other hand by a washer 22 fixed against the radial end face of the piston 8, so that the ring 19 is axially movable relative to the piston 8 in order to absorb any radial movements of the piston 8 relative to the cylinder 2.
  • the cavity 18 of the piston 8 has, at the bottom, an interior chamber 23 which is connected to the fluid chamber 9 by a longitudinal channel 24 formed in the piston 8.
  • a main flow channel 25 which comprises a longitudinal channel 26 opening into the passage 17 of the radial wall 6 of the cylinder 2, passage which can be connected to an external fluid conduit, as well as 'a radial channel 27 opening at the periphery of the longitudinal projecting part 16.
  • the longitudinal projecting part 16 also has a secondary canan 28 which extends towards the free end of this part 16 the channel 26 of the main flow channel 25 and which has a radial canan 29 opening at the periphery of the longitudinal projecting part 16.
  • a valve 30 closing this channel when it abuts in the direction of the main flow channel 25 on a frustoconical seat 31, this valve 30 being subjected in this direction to a spring 32.
  • the fluid flow means 15 has the following arrangements.
  • the peripheral opening of the radial channel 27 of the main flow channel 25 is disposed at a distance from an inner annular shoulder forming a stop 33 of the radial end wall 6 of the cylinder 2, formed around the axial passage 17 of this wall 6
  • the length of the ring 19 mounted in the cavity 18 of the piston 8 is such that, when the radial end wall of the piston 8 is in abutment against the shoulder 33, this ring 19 covers or extends opposite the peripheral opening of the radial channel 27 of the main flow channel 25.
  • the space annular 20 formed between the ring 19 and the peripheral wall of the longitudinal projecting part 16 is such that when this ring 19 covers the peripheral opening of the radial channel 27 of the main flow channel 25, the flow of the fluid is limited by relative to its flow when this ring 19 does not cover this opening, that is to say when the piston 8 is distant from the shoulder 33 of the radial end wall 6 of the cylinder 2 at least beyond the peripheral opening of the radial channel 27.
  • the constituent parts of the flow means 15 a identical and symmetrical to the flow means 15 and provided at the other end of the piston 8, bear the same reference numbers accompanied by the index a .
  • the radial channels 27 and 27 a flow means 15 and 15 a are formed such that the piston 8 has a central stroke in which the rings 19 and 19 a provided in the cavities 18 and 18 a do not cover the openings peripherals of these radial channels 27 and 27 has main flow channels 25 and 25 a .
  • the cylinder 1 described above operates in the following manner.
  • the end chamber 10 is supplied through the passage 17 a of the radial end wall 7. This supply of fluid to the chamber 10 and l 'Evacuation of the fluid from the chamber 9 occur symmetrically to what has just been described. This movement from right to left is therefore also at two speeds.
  • the central part of the piston 8 has a longitudinal rack 34 which is engaged with a toothed wheel 35 with transverse axis which is arranged in a projecting part 36 of the central part 3 of the cylinder 2 and which is carried by the latter.
  • the wheel 35 is rotated in one direction or the other. Thanks to the particular flow means 15 and 15 a , the rotary movement of the wheel 35 can be braked on the end parts of its reciprocating movements.
  • the jack 1 which has just been described can be applied whenever there is a need to brake, at the end of the travel in one direction or in the other, the element which the jack is intended to drive.
  • a particularly interesting application is in the field of driving closure elements such as doors or gates.
  • the cylinder 1 described above comprises at its two ends the flow means 15 and 15 a . It is understood that this cylinder could have only one of these flow means so that the movement of the piston 8 relative to the cylinder 2 would only be braked in the end part of its stroke in a direction of movement and not in its other direction.
  • the flow means 15, respectively the flow means 15 a is in fact constructed so as to ensure an evacuation of the fluid from the fluid chamber 9 with which it is associated in a first condition, on part of the piston stroke 8, directly through the main flow channel 25 and in a second condition, on a terminal of the piston stroke, also through the main flow channel 25 but passing through the space 20 separating the ring 19 from the cavity 18 of the piston 8 and the projecting part 16, space 20 in which the flow of the fluid is braked.
  • the flow means 15 is constructed so as to ensure, in the other direction of movement of the piston 8, a supply of fluid to the fluid chamber 9 initially through the secondary flow channel 28 and in a second step directly by the main flow channel 25, without being braked by the flow means 15, all along this stroke.
  • the end of the piston 8 not comprising the flow means can carry, in a conventional manner, a longitudinal cylinder rod.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP90400007A 1989-01-04 1990-01-03 Druckmittelbetätigte Kolben-Zylinder-Einheit Withdrawn EP0377529A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8900050A FR2641342A1 (fr) 1989-01-04 1989-01-04 Verin d'actionnement a fluide
FR8900050 1989-02-08

Publications (1)

Publication Number Publication Date
EP0377529A1 true EP0377529A1 (de) 1990-07-11

Family

ID=9377468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400007A Withdrawn EP0377529A1 (de) 1989-01-04 1990-01-03 Druckmittelbetätigte Kolben-Zylinder-Einheit

Country Status (2)

Country Link
EP (1) EP0377529A1 (de)
FR (1) FR2641342A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0617202A1 (de) * 1993-02-22 1994-09-28 Fibro GmbH Vorrichtung zur Endlagendämpfung eines bewegten Systems
DE4428648A1 (de) * 1993-12-09 1995-06-14 Smc Corp Stangenloser Zylinder mit Geschwindigkeitssteuermechanismus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108511A (en) * 1961-10-26 1963-10-29 Erickson Tool Co Hydraulic cylinder with adjustable chshioning means
US3447423A (en) * 1966-08-10 1969-06-03 Mathews Eng Co Ltd E Rotary fluid pressure actuators
CH539784A (de) * 1971-12-13 1973-07-31 Bbc Brown Boveri & Cie Hydraulischer Antrieb, insbesondere für elektrische Schaltgeräte
FR2181525A1 (de) * 1972-04-27 1973-12-07 Gratzmuller Jean Louis
EP0080579A1 (de) * 1981-11-26 1983-06-08 WABCO Westinghouse Steuerungstechnik GmbH & Co. Einrichtung zur Endabbremsung des Arbeitskolbens eines doppeltwirkenden Arbeitszylinders

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57149604A (en) * 1981-03-09 1982-09-16 Shin Meiwa Ind Co Ltd Single-acting cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108511A (en) * 1961-10-26 1963-10-29 Erickson Tool Co Hydraulic cylinder with adjustable chshioning means
US3447423A (en) * 1966-08-10 1969-06-03 Mathews Eng Co Ltd E Rotary fluid pressure actuators
CH539784A (de) * 1971-12-13 1973-07-31 Bbc Brown Boveri & Cie Hydraulischer Antrieb, insbesondere für elektrische Schaltgeräte
FR2181525A1 (de) * 1972-04-27 1973-12-07 Gratzmuller Jean Louis
EP0080579A1 (de) * 1981-11-26 1983-06-08 WABCO Westinghouse Steuerungstechnik GmbH & Co. Einrichtung zur Endabbremsung des Arbeitskolbens eines doppeltwirkenden Arbeitszylinders

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 253 (M-178)[1131], 11 décembre 1982; JP-A-57 149 604 (SHINMEIWA KOGYO) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0617202A1 (de) * 1993-02-22 1994-09-28 Fibro GmbH Vorrichtung zur Endlagendämpfung eines bewegten Systems
DE4428648A1 (de) * 1993-12-09 1995-06-14 Smc Corp Stangenloser Zylinder mit Geschwindigkeitssteuermechanismus
DE4428648C2 (de) * 1993-12-09 1998-03-26 Smc Corp Stangenloser Zylinder mit Geschwindigkeitssteuermechanismus

Also Published As

Publication number Publication date
FR2641342A1 (fr) 1990-07-06

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