EP0872646B1 - Druckluftzylinder - Google Patents
Druckluftzylinder Download PDFInfo
- Publication number
- EP0872646B1 EP0872646B1 EP98107107A EP98107107A EP0872646B1 EP 0872646 B1 EP0872646 B1 EP 0872646B1 EP 98107107 A EP98107107 A EP 98107107A EP 98107107 A EP98107107 A EP 98107107A EP 0872646 B1 EP0872646 B1 EP 0872646B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- compressed air
- air cylinder
- pressure chamber
- cylinder according
- 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.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
- F02D9/06—Exhaust brakes
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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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
- F15B15/1423—Component parts; Constructional details
- F15B15/1476—Special return means
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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
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
Definitions
- the invention relates to an air cylinder according to the preamble of claim 1.
- Compressed air cylinders of this type can be found in many fields Application, for example for actuating the exhaust flap an engine brake in commercial vehicles.
- Such a compressed air cylinder has a cylinder housing, a piston, a piston rod, a return spring and a cylinder cover. Via an outer channel Compressed air supplied to the piston and the one with it connected piston rod against a strong retaining spring pushes outwards. When retracting the piston in retracted position, it can not be avoided that dust and water get inside the cylinder housing. The appropriate deposits lead to increased abrasion between piston and cylinder housing and between Piston rod and outlet face of the same, what the Printing cylinder life reduced.
- the exhaust flap When braking commercial vehicles, the exhaust flap is partly which is actuated by the air cylinder, eccentrically arranged on a torsion bar by the piston rod is rotated, and thus the exhaust flap.
- the torsion bar has a certain elasticity to the exhaust flap a certain maximum exhaust pressure by a gap open and keep constant at this pressure. Thereby damage to the engine (piston valve train) itself avoided.
- Another way is to open the Exhaust flap by a gap using an im Compressed air cylinder causes existing coil spring. Both Constructions are relatively expensive and in their function is imprecise. There are set losses of the Spring and high frictional resistance.
- the invention is based on the problem of a Form air cylinder of the type mentioned at where the compressed air is also used to retract the piston rod retracted position can be used.
- the restoring force for the piston is said to be considerably increased become.
- exhaust flap such as a torsion bar, should can be dispensed with.
- a pressure chamber as Retractor provided at the same time, however somewhat delayed with the introduction of compressed air into the Cylinder housing is filled with this when the Piston rod is extended. Relieve that Cylinder housing from the pressure of the compressed air, so that presses in the Pressure chamber under the same high pressure compressed air Return the piston to the retracted position, specifically via a corresponding connection to the outside, that is facing away from the cylinder housing, end face of the piston, so that this with high pressure in its retracted position is pushed back; then the piston should be in this retracted position.
- the cylinder housing can be connected by connecting valves in the piston part of the compressed air supplied into the joint with this and coaxially provided pressure chamber.
- the pressure build-up in the pressure chamber is delayed.
- an inlet valve within the Pistons are provided, which in the compressed air supply Cylinder housing opens with a delay, while the Extend the piston with the piston rod outwards.
- Reverse outlet valve opens the pressure chamber in Direction of the cylinder housing if there is one in the pressure chamber Pressure relief takes place.
- For the compressed air supply and the Compressed air discharge is a single common external duct intended.
- another exterior Cylinder are provided by a second end face of the circular cylindrical air cylinder protrudes inwards; in this can be a correspondingly narrowed outer bulb be snapped into place.
- the ratio of the printing areas determines the pressure conditions.
- a connecting channel between the cylinder housing and the pressure chamber can also be designed in a simple manner, preferably Recesses arranged in a circular symmetry in the area of the Circumferential sealing rubber rings or their holder provided become.
- the low dimensioning causes one corresponding delay in the pressure build-up in the pressure chamber and thereby a pressure drop between the cylinder housing and Pressure chamber during the dynamic actuation of the Air cylinder to build up an essentially identical final pressure.
- the exit point of the piston from the front end wall of the air cylinder can be slightly with compressed air be charged. This ensures that no dirt enters the inside of the air cylinder, both when extending and when retracting the Piston rod.
- a compression spring provided that, however, less massive than in the state of Technology can be trained. This is between the inside the piston which is adjacent to the pressure chamber, and opposite end face, the exit side of the Piston rod, arranged.
- the piston in an inner piston and an outer piston be divided.
- the diameter ratio of both Partial piston is after the acting on the piston rod Axial forces determined.
- the inner part of the piston can be slightly opposite outer partial piston axially towards the bottom or Inlet channel of the cylinder housing slidably formed his. This can be done by using a snap ring bracket Seegerring or the like as a retaining ring between the two Partial pistons are effected. At the same time are preferred corresponding annular recesses on the inner part of the piston provided in which corresponding outer ribs on Fit the outer circumference of the inner piston part.
- the connecting channel of the piston between which the Compressed air-absorbing cylinder housing around the piston and The O-sealing ring can be used to push the piston rod outwards a small one on the outer cylinder of the piston Flattening on one or more distributed around the circumference Have digits. Instead, it can also have a central Bore at the piston end of the piston rod, one communicating cross hole to the pressure chamber, and a Sealing device for the central bore Connection channel are made.
- Inside the inside Partial cylinder can be a small holding cylinder for one small holding piston are formed, the compressed air via an end O-ring opposite the end of the Holding cylinder seals against a compression spring, and at lack of compressed air around the inlet duct releases the connection.
- the pressure cylinder is usually provided with a stop.
- a stop This can for example in the form of a stop ring on Inner circumference of the cylinder housing in the area of the Exit point of the piston rod facing half of the Cylinder housing are provided. Or it can in Middle area of the cylinder housing a narrower central Stop cylinders are provided in which the described inner piston can retract.
- Figure 1 shows a generally designated 10 Compressed air cylinder, which has a base 11 on the exhaust pipe 9 a commercial vehicle is arranged. During the first End face 14 stationary, but articulated, on the base 11 attached, emerges from the opposite second Face 16 of the compressed air cylinder 10, the piston rod 18th slidable. About an articulated with the end of the Piston rod 18 connected flap lever 26 is the Exhaust flap 12 rotatable within the exhaust pipe 9, the a torsion bar 24 is rotatably mounted.
- Figure 2 shows the top view of that shown in Figure 1
- This narrowing 25 has a certain effect Torsional flexibility. This allows the exhaust flap 12 to open a small gap to reach a determined maximum pressure, the exhaust pipe 9 by a gap release and thereby engine damage, e.g. B. in Prevent valve operation.
- Figure 3 shows the circular cylindrical cross section a first embodiment of a compressed air cylinder 10, with an outer wall 15, a centrally arranged Piston rod 18, a pressure chamber 40 and a stop ring 17 for the - not shown - piston of the air cylinder.
- Wiping lip 56 is provided on the opposite second end face 16 of the Air cylinder 10 is around the exit area of the Piston rod 18 with an outer sealing element 54 Wiping lip 56 is provided.
- the first end face is designated 14, the feed channel to the pressure chamber at 30, the wiper lip of the outer Sealing element 54 with 56, the discharge channel from the pressure chamber is designated 32.
- Air cylinders generally designated 110, the fixed first face with 114, the opposite second End face from which the piston rod 118 emerges with 116, the cylinder housing with 122, the pressure chamber with 140, the inlet valve of the piston 120 into the pressure chamber 140 with 134, the corresponding outlet valve from the pressure chamber with 136.
- the two corresponding connection channels to common outer channel 128 are designated 130 and 132, the connection channel to the cylinder housing with 129.
- the main difference of the embodiment of Figure 5 compared to the embodiment of Figure 3 and Figure 4 consists in the elimination of a retaining spring by a push ball device on a rear Extension rod 119 is realized, which is an annular groove 138, in which two opposing balls 139 intervene, which are biased by compression springs 141.
- the compressed air supplied through the common outer duct 128 pushes the piston rod 118 against the pressure of this Compression springs 141 to the front.
- the piston 120 is pressed down to the stop and snaps back through the preloaded balls 139 in retracted stationary position.
- the air cylinder generally designated 210, the lower fixed, articulated Connection with 214, the opposite end face with 216, from which the piston rod 218 emerges, sealed by an outer sealing part 254 with wiping lip 256.
- the common outer channel is at 228, the connecting channel to Cylinder housing 222 designated 229.
- another outer piston 221 with a defined, significantly smaller cross-section on the inside protruding fitting cylinder housing 223 insertable and such is designed so that the pressure on the exhaust valve 12 from Outer piston 221 of the piston is collected. exceeds the force or pressure on the piston rod 218 which from External cylinder outgoing force, so this gradually gives the exhaust flap 12 opens a gap. The exhaust gas pressure is reduced.
- the feed channel to the pressure chamber is designated 230 and in Area of the O-sealing ring 231 arranged. He is in individual not recognizable from FIG. 6 and exists preferably from recesses in the guide ring groove 233 on Outer periphery of the piston 220.
- a outer sealing element 254 provided with wiper lip 256.
- this area becomes a small proportion of Compressed air passed (not shown in the drawing), which for a small annular compressed air outlet around the Piston rod 18 around, both when extending as well as when retracting the piston rod 18, so that the Inside of the air cylinder reliably from entering Pollution and the like is kept free.
- Figure 7a shows the side view of a piston 220 with the Feed channel 230 to and from the pressure chamber Area of the guide ring groove 233 for the O-sealing ring 231.
- Figure 7b shows the same arrangement in longitudinal section, wherein the supply channel 230 at a peripheral region of the piston 220 is visible.
- Figure 8a shows the same reference numerals 6, the outer sealing element 254 with scraper lip 256 in a larger representation, around that Roaming compressed air both when extending and to represent when retracting the piston with piston rod 218. Furthermore, the pressure chamber 240 of the compressed air cylinder 210 designated.
- FIG. 8b shows a slightly different representation, with the Piston 220 is shown in more detail.
- FIG. 9 shows the longitudinal section through the one in FIG. 6 Air cylinder shown when extended Piston rod 218, the end of which is pivotable Actuation lever 270 for an exhaust flap 212 within one Exhaust pipe is shown.
- a holding device for the piston rod is here at one stationary console 262 a stable pressure profile spring 260 am End of the piston rod 218 between the operating lever 270 the exhaust valve 212 of an engine brake and the stationary one Console 262 provided.
- FIG. 10 shows the area of the exit of the piston rod 218 and the actuating lever 270 when the piston rod is retracted.
- Figure 11 shows an enlarged view of the general with 320 designated piston, which consists of an outer sub-piston 360 and an inner sub-piston 362.
- the sealing after outside through a guide ring groove 331 for one Sealing ring 333.
- By flattening the sealing ring 333 on a small section becomes a connecting channel 330 between the arranged below the piston 320 Cylinder housing and the one arranged above the piston Pressure chamber in the area around the piston rod 318.
- the seal between the two pistons is through a sealing bead 366 on the lower face of the Piston 320 made that on an inner groove 368 as well one arranged against the forces occurring Stop rib 369 of the outer piston part 360 are held.
- a snap ring 565 closes between the two pistons arranged a slight axial movement of the same against each other and thus a corresponding return movement of the Piston rod 318 allows for overpressure.
- the Piston rod 318 is inside by a Bearing 371 stored.
- Figure 12 shows the printing cylinder in its entirety, from shown in Figure 11, the detailed representation of the piston is.
- a base 311 an inlet and Outlet channel 328 for the compressed air
- a piston 320 and one Piston rod 318 provided.
- the radius ratio between outer and inner partial piston is due to the occurring Pressure ratios determined.
- the upper snap ring 365 related to the lower mutual Sealing bead 366 enables a slight axial Displacement of the piston rod 318 with the over it Bearing 371 rigidly connected inner piston 362 opposite the outer partial piston 360.
- an annular stop 323 for an inner circumferential ring 361 of the outer sub-piston 360 intended.
- Air cylinder 310 with the second end face 316 is via a cylinder guide piece 327, a seal 353 and an outlet sealing member 354 led to the outside includes a wiper lip 356 and a snap ring 365 or the like is recorded.
- Compression spring 380 tensioned to the retention forces of the Piston rod 318 and vibrations even at extreme Exclude conditions.
- Figure 13 describes a fifth embodiment of a Compressed air cylinder 410, which except for the piston in essentially in the same way as the performance example of Figure 12 is constructed and therefore not in detail must be described. Again, there is an additional one Compression spring 480 opposite the piston 420 and the opposite end face 416 of the compressed air cylinder 410 intended.
- the piston rod is designated by 418 and by 416 the second end face, with 454 the outlet sealing device, at 427 the opposite Guide part for the piston rod 418, with 423 Ring stop for an outer stop ring 461 of the outer Partial piston 460, with 462 is the inner part of the piston referred to, both together are generally designated 420, the base is 411, the off-inlet duct for the compressed air designated 428, the outer O-ring seal for the Piston 420 or the outer partial piston 460 has 433 designated, the snap ring between the two pistons is with Designated 465. A seal between the inner piston and Outer piston is secured by an O-ring 466. Also here is a relative movement between the two pistons by appropriate profile-like design at the bottom End guaranteed.
- the lower end of the piston rod 418 has a special connection channel between the Pressure chamber 460 and the cylinder housing 422 on through a piston-side axial longitudinal bore 490, and one of these crossing cross bore 492 connected to the pressure chamber 440 is formed.
- Inside the inner part of the piston 462 is a small central holding cylinder 430 formed, the associated holding piston 431 via an end O-ring 494 then against the end face 496 of the holding cylinder 430 seals against a compression spring 498 when over the Inlet 428 compressed air on the bottom side of the holding piston 431 presses. Without pressure, the holding piston 431 in the in Figure 13 shown rest position and gives the Connection channel with the holes 490, 492 to the inlet channel 428 free via a mesh filter 499.
- FIG. 14 shows the longitudinal section of a compressed air cylinder 510 with a first end face 514 on a base 511, the is rotatably supported, and an opposite second End face 516.
- the base 511 has an outer Connection channel 528, 529 to the cylinder housing 522 on the lower end of the piston 520 rests in this Embodiment of an outer piston 560 and an inner partial piston 562, which has two O-rings 566, 568, and a lower connecting snap ring 565 a peripheral portion of the inner sub-piston 562 and an adjacent circumferential groove 564 on the inner circumference of the outer partial piston 560 so sealed together are that a slight elastic movement of the Inner piston 562 with the piston rod 518 opposite Outer piston 560 towards the bottom of the cylinder housing 522 is made possible, for example, in order to occur Overpressure on a connected exhaust flap open at short notice.
- the compression spring 580 the can be relatively weak, offers in addition to the pressure chamber 540 a security against undesirable displacement of the piston rod 518, as well as against Vibrations from the junction of the free end of the Piston rod 518 to the respective device to be actuated, etc. may occur.
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- General Engineering & Computer Science (AREA)
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Description
Claims (24)
- Druckluftzylinder (10, 100, 200), vorzugsweise zur Betätigung der Abgasklappe (12) einer Motorbremse,a) dessen erste Stirnseite (14, 114, 214) vorzugsweise ortsfest und vorzugsweise schwenkbar gelagert ist,b) aus dessen gegenüberliegender zweiten Stirnseite (16, 116, 216) eine Kolbenstange (18, 118, 218) eines in einem Zylindergehäuse (22, 122, 222) verschiebbaren Kolbens (20, 120, 220) austritt,c) wobei die Kolbenstange (18) mit einem Betätigungsmechanismus, vorzugsweise einer Achse (24) einer Abgasklappe (12) einer Motorbremse über einen Klappenhebel (26), verbunden ist,d) wobei ein Außenkanal (28, 128, 228) zum Zu- und Abführen von Druckluft vorgesehen ist, der über einen Verbindungskanal (29, 129, 229) mit dem Zylindergehäuse verbunden ist,e) wobei eine Halteeinrichtung (38, 138, 238) für den Kolben in eingefahrener Stellung vorgesehen ist, undf) wobei eine Rückzieheinrichtung für den Kolben von der ausgefahrenen in die eingefahrene Stellung vorgesehen ist,
dadurch gekennzeichnet,g) daß die Rückzieheinrichtung aus einer Druckkammer (40, 140, 240) besteht,h) mit einem Zuführkanal (30, 130, 230) und einem Abführkanal (32, 132, 232), der ein Einlaßventil (34, 134, 234) bzw. ein Ablaßventil (36, 136, 236) aufweist,i) welche mit dem Außenkanal (28, 128, 228) in Verbindung stehen,j) wobei die Druckkammer (40, 140, 240) über den Zuführkanal (30, 130, 230) und das Einlaßventil (34, 134, 234) im wesentlichen gleichzeitig mit dem Zylindergehäuse mit Druckluft füllbar ist,k) wobei die Druckkammer nach der Druckentlastung des Zylindergehäuses auf die außenliegende Stirnseite (27, 127, 227) des Kolbens (20, 120, 220) Druck ausüben kann,l) derart, daß dieser in eingefahrene Stellung gedrückt wird. - Druckluftzylinder nach Anspruch 1, dadurch gekennzeichnet, daß das Einlaßventil (34, 134) und das Ablaßventil (36, 136) vorgespannte Kugelventile sind, die durch Druckluft zu öffnen sind.
- Druckluftzylinder nach Anspruch 1 oder 2, gekennzeichnet durch eine Verzögerungseinrichtung der Druckluftzufuhr zur Druckkammer (40, 140, 240), vorzugsweise in Form des Einlaßventiles (34, 134), derart, daß sich der Luftdruck in der Druckkammer langsamer als im Zylindergehäuse (22, 122, 222) aufbaut, so daß dort nach der Betätigung des Druckluftzylinders zunächst ein niedrigerer Luftdruck herrscht.
- Druckluftzylinder nach einem der Ansprüche 1 bis 3, gekennzeichnet durch eine Rückhaltefeder (88) in der Druckkammer (40) für den Kolben (20), vorzugsweise an der Kolbenstange (18), als Halteeinrichtung.
- Druckluftzylinder nach einem der Ansprüche 1 bis 3, gekennzeichnet durch eine Halteeinrichtung in Form einer Vertiefung wie einer Ringnut (138) an einer hinteren Verlängerungsstange (119) des Kolbens (120), in welche unter Druck wie unter Federdruck stehende Halteglieder, wie Kugeln (139), angreifen.
- Druckluftzylinder nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Druckkammer (40, 140) zwischen Kolben (20, 120, 220) und zweiter Stirnseite (16, 116, 216) angeordnet ist.
- Druckluftzylinder nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet,a) daß der Kolben (220) einen der zweiten Stirnseite (216) zugewandten äußeren Kolben (221) aufweist, der in ausgefahrener Stellung in ein passendes äußeres Zylindergehäuse (223) in Anschlagstellung einschiebbar ist, wobei äußerer Kolben und passendes äußeres Zylindergehäuse einen reduzierten Querschnitt aufweisen,b) daß zwischen Zylindergehäuse (222) und Druckkammer (240) ein derart enger oder mehrere derart enge, um den Umfang regelmäßig verteilte Zuführkanäle (230), die identisch mit den Abführkanälen sind, vorgesehen sind, daß in der Druckkammer (240) während der Betätigung des Druckluftzylinders zunächst ein niedrigerer Druck als im Zylindergehäuse (222) herrscht.
- Druckluftzylinder nach Anspruch 7, dadurch gekennzeichnet, daß die engen Zuführkanäle (230) durch definierte Aussparungen am Abdichtungs-O-Ring (231) oder an der zugeordneten Ringnut (233) am Umfang des Kolbens (220) gegenüber der gemeinsamen Innenwandung von Zylindergehäuse (222) bzw. Druckkammer (240) bestehen, welche für einen verzögerten Druckluftaufbau in der Druckkammer sorgen.
- Druckluftzylinder nach einem der Ansprüche 1 bis 8, gekennzeichnet durch ein mittels Spiralfeder (52, 152) oder dergleichen vorgespanntes Einlaßventil (34, 134) in die Druckkammer (40, 140) und/oder einen in definierter Weise gering gewählten Einlaßdurchmesser eines oder mehrerer Verbindungskanäle (230) in die Druckkammer (240) zur Erzeugung eines zunächst niedrigeren Druckes in der Druckkammer nach der Betätigung des Druckluftzylinders.
- Druckluftzylinder nach einem der Ansprüche 1 bis 11, gekennzeichnet durch eine äußere Dichtlippe (54, 154, 254) zwischen Austritt der Kolbenstange (18, 118, 218) aus der zweiten Stirnseite (16, 116, 216) des Druckluftzylinders, die von innen her stets unter derartigem Luft-Überdruck steht, daß diese sowohl beim Einfahren als beim Ausfahren der Kolbenstange aus einem schmalen Ringspalt um die Kolbenstange herum beim Ein- und Ausfahren der Kolbenstange ausgeblasen wird.
- Druckluftzylinder nach Anspruch 10, daß die äußere Dichtlippe (54, 154, 254) des Abstreifers eine Abstreiflippe (56, 156, 256) aufweist, und daß der Luft-Überdruck in diesem Bereich aus einem Verbindungsspalt zwischen Druckkammer (40, 140, 240) und Kolbenstange (18, 118, 218) oder durch eine Drosselbohrung und Membran im Zylinderdeckel herrührt.
- Druckluftzylinder nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die Haltekraft des Außenkolbens (221) am äußeren Zylindergehäuse (223) durch das Flächenverhältnis des eigentlichen inneren Kolbens (220) zum äußeren Kolben (221) bestimmt ist.
- Druckluftzylinder nach einem der Ansprüche 1 bis 12, gekennzeichnet durch einen Druckregler für die am Außenkanal (28, 128, 228) eingeführte Druckluft.
- Druckluftzylinder nach einem der Ansprüche 1 bis 13, gekennzeichnet durch eine Druck-Profilfeder (260) am Ende der Kolbenstange (218) zwischen einem Betätigungshebel (270) eines mit ihr verbundenen Verbrauchers, wie der Abgasklappe (212) einer Motorbremse, und einer stationären Konsole (262), um eine Halteeinrichtung (260) für die Kolbenstange in eingefahrener Kolbenstellung zu bilden.
- Druckluftzylinder nach einem der Ansprüche 1 bis 14, gekennzeichneta) durch ein gemeinsames zylindrisches Gehäuse, das durch einen gemeinsamen Kolben (20, 120, 220) in ein Zylindergehäuse (22, 122, 222) und eine Druckkammer (40, 140, 240) unterteilt ist, undb) wenigstens eine als Einlaßventil (34, 134, 234) sowie eine als Auslaßventil (36, 136, 236) wirkende, im Kolben oder Kolbenumfang vorgesehene Einrichtung, sowiec) eine Verzögerungseinrichtung zur Betätigung jedes dieser Ventile.
- Druckluftzylinder nach einem der Ansprüche 1 bis 15, gekennzeichnet durch eine Druckfeder (380, 480, 580), vorzugsweise relativ schwach ausgebildet, zwischen Innenseite (340, 440, 540) des Kolbens (320, 420, 520) und gegenüberliegender Stirnseite (316, 416, 516) des Zylindergehäuses (322, 422, 522) zur Erhöhung der Rückstellkraft und zur noch besseren Verhinderung von Vibrationen gegenüber an der Kolbenstange (318, 418, 518) wirkenden Achsialkräften bei extremen Einsatzbedingen.
- Druckluftzylinder nach einem der Ansprüche 1 bis 16, dadurch gekennzeichnet, daß der Kolben (320, 420, 520) aus einem äußeren Teilkolben (360, 460, 560) und einem inneren Teilkolben (362, 462, 562) besteht, deren Durchmesserverhältnis nach den an der Kolbenstange (318, 418, 518) auftretenden Achsialkräften bestimmt ist, wobei eine gegenseitige Abdichtungseinrichtung (366; 466; 566, 568) vorgesehen ist.
- Druckluftzylinder nach Anspruch 17, dadurch gekennzeichnet, daß der innere Teilkolben (362, 462, 562) in Richtung Druckluftkanal (328, 428, 528) geringfügig achsial verschiebbar ausgebildet ist.
- Druckluftzylinder nach Anspruch 18, dadurch gekennzeichnet, daß die geringfügige achsiale Verschiebbarkeit des inneren Teilkolbens gegenüber dem äußeren Teilkolben durch einen in einer Außennut des inneren Teilkolbens außerhalb des Bereiches des äußeren Teilkolbens vorgesehenen Sprengring (365, 465, 565), Seegerring oder dergleichen bewirkt wird, der achsial geringfügig elastisch nach außer erweiterbar ist, wobei am Innenumfang des äußeren Teilkolbens eine Umfangs-Aussparung (564) oder sonstige Halterungseinrichtung zur Aufnahme einer äußeren Ringwulst (467, 567) des inneren Teilkolbens (362, 462, 562) vorgesehen ist, die auch den Eingriff beider Teilkolben für eine gemeinsame Verschiebung weg vom Einlaßkanal (328, 428, 528) sicherstellen.
- Druckluftzylinder nach einem der Ansprüche 17 bis 19, dadurch gekennzeichnet, daß als Abdichtungsmittel zwischen dem äußeren Teilkolben (460, 560) und dem inneren Teilkolben (462, 562) in Umfangsnuten verlaufende O-Dichtungsringe (466; 566, 568) oder eine am äußeren, dem Einlaßkanal (328) zugewandten Endabschnitt eine in einer Ringnut (322) beines Teilkolbens (362) und einem gegenüberliegenden Auflagerrand am anderen Teilkolben (360) gehalterte Dichtungsmembran (366) angeordnet ist.
- Druckluftzylinder nach einem der Ansprüche 1 bis 20, dadurch gekennzeichnet, daß der Verbindungskanal des Kolbens zwischen Druckkammer (340, 440, 540) und Zylindergehäuse durch eine kleine Abflachung (330) des O-Ringes (333) gebildet wird.
- Druckluftzylinder nach einem der Ansprüche 1 bis 21, dadurch gekennzeichnet, daß der Verbindungskanal zwischen Druckkammer (440) und dem, dem Einlaßkanal (28) zugewandten Boden des Zylindergehäuses (422) durch eine kolbenseitige achsiale Bohrung (490) der Kolbenstange (418) und eine mit dieser und der Druckkammer (440) in Verbindung stehende Querbohrung (492) gebildet wird,
wobei die achsiale Bohrung (490) dann durch einen O-Ring (494) an der Stirnseite eines kleinen achsialen Halbekolbens (431) und entgegen einer Druckfeder (498) gegen die Stirnseite (496) eines zugeordneten achsialen Haltezylinders (430) abgedichtet wird, wenn der Einlaßkanal (428) unter dem Druck von Druckluft steht, und andernfalls der Verbindungskanal durch Verschieben des Haltekolbens (431) freigegeben wird. - Druckluftzylinder nach Anspruch 22, dadurch gekennzeichnet, daß der Haltekolben auf einem Maschenfilter (499) aufsitzt.
- Druckluftzylinder nach einem der Ansprüche 1 bis 21, gekennzeichnet durch einen äußeren Anschlagring (323, 423) am Innenumfang des Zylindergehäuses (322, 422) oder durch einen zentralen Anschlagzylinder (523) zur Aufnahme eines inneren Teilkolbens (562).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19716564A DE19716564A1 (de) | 1997-04-19 | 1997-04-19 | Druckluftzylinder |
DE19716564 | 1997-04-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0872646A1 EP0872646A1 (de) | 1998-10-21 |
EP0872646B1 true EP0872646B1 (de) | 2003-06-18 |
Family
ID=7827121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98107107A Expired - Lifetime EP0872646B1 (de) | 1997-04-19 | 1998-04-18 | Druckluftzylinder |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0872646B1 (de) |
DE (2) | DE19716564A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004038398B3 (de) * | 2004-08-06 | 2006-04-13 | Technomatik Gmbh & Co. Kg | Verfahren zur stufenlosen Stellungsregelung eines Pneumatikzylinders sowie Pneumatikzylinder mit stufenloser Stellungsregelung |
DE102006034886A1 (de) * | 2006-07-25 | 2008-01-31 | Behr Gmbh & Co. Kg | Fluidstromregelungseinrichtung |
DE102011106629A1 (de) * | 2011-06-17 | 2012-12-20 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Steuerzylinder für eine Motorbremse mit Mitteln zur Erzeugung einer Rückfederung |
CN102493878B (zh) * | 2011-12-01 | 2014-09-10 | 瑞立集团瑞安汽车零部件有限公司 | 一种用于汽车的排气制动阀及汽车 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3023740A (en) * | 1960-05-25 | 1962-03-06 | Fairchild Stratos Corp | Delayed pneumatic actuator |
DE3066506D1 (en) * | 1979-10-11 | 1984-03-15 | Knorr Bremse Gmbh | Pneumatic positioning device for sustaining at least one element, for example an aeration or deaeration screen |
DE3125127A1 (de) * | 1981-06-26 | 1984-08-30 | Wabco Fahrzeugbremsen Gmbh, 3000 Hannover | Arbeitszylinder |
AT383871B (de) * | 1985-11-13 | 1987-09-10 | Enfo Grundlagen Forschungs Ag | Einfachwirkender arbeitszylinder |
DE3914811A1 (de) * | 1988-09-21 | 1990-03-22 | Bosch Gmbh Robert | Einkammer-arbeitszylinder |
DE19617058A1 (de) * | 1996-04-29 | 1997-10-30 | Andreas Ing Grasl | Druckluftzylinder zur Betätigung von Rauchabzugsklappen in Rauch- und Wärmeabzugsanlagen |
-
1997
- 1997-04-19 DE DE19716564A patent/DE19716564A1/de not_active Withdrawn
-
1998
- 1998-04-18 EP EP98107107A patent/EP0872646B1/de not_active Expired - Lifetime
- 1998-04-18 DE DE59808731T patent/DE59808731D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59808731D1 (de) | 2003-07-24 |
DE19716564A1 (de) | 1998-10-22 |
EP0872646A1 (de) | 1998-10-21 |
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