EP0280944B1 - Actuator - Google Patents

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Publication number
EP0280944B1
EP0280944B1 EP88102041A EP88102041A EP0280944B1 EP 0280944 B1 EP0280944 B1 EP 0280944B1 EP 88102041 A EP88102041 A EP 88102041A EP 88102041 A EP88102041 A EP 88102041A EP 0280944 B1 EP0280944 B1 EP 0280944B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston rod
braking device
cylinder according
braking
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
Application number
EP88102041A
Other languages
German (de)
French (fr)
Other versions
EP0280944A1 (en
Inventor
Klaus Dr. Ing. Denker
Oskar Dr. Ing. Peter
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
Publication of EP0280944A1 publication Critical patent/EP0280944A1/en
Application granted granted Critical
Publication of EP0280944B1 publication Critical patent/EP0280944B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member

Definitions

  • the invention relates to a cylinder according to the preamble of the main claim.
  • a working cylinder known from EP-A 0 124 727
  • the cylinder tube and the guide rods connected to one another via the yoke are fastened or guided on a short, U-shaped guide unit, as a result of which the load spacing is large and the load on the bearings is high .
  • the braking device has a large installation cross section, acts eccentrically on the piston rod with metallic contact surfaces and is relatively complex, which makes it expensive and voluminous and does not allow the braking effect to be metered in a controllable manner.
  • the cylinder according to the invention with the characterizing features of the main claim has the advantage that the guide unit is very powerful and relatively light, which makes the cylinder easier and lighter.
  • the Bremsein direction is very compact, simple and self-centering and can be arranged, for example, in a very practical manner between the cylinders receiving the guide rods.
  • FIG. 1 shows a plan view with a partial section through a working cylinder
  • FIG. 2 shows a section along 11-11 according to FIG. 1
  • FIG. 3 shows a modification of the exemplary embodiment according to FIG. 1.
  • 10 denotes a guide unit which consists of two cylinders 11, 12 which run parallel to one another and which are connected to one another by a transverse web 13, as a result of which the guide unit is given the shape of an H.
  • the cylinder head 14 of a working cylinder 15 is fastened, the other end of which is closed by a cover 16.
  • a double-acting piston (not shown in any more detail) is guided in a tightly sliding manner, the piston rod 17 of which extends outwards between the cylinders 11 and 12 parallel to these.
  • a coupling 19 is screwed, which is connected to a yoke 20.
  • a guide rod 21 or 22 is attached, which are guided in bores of the cylinders 11, 12, for. B. in plain or ball bearings.
  • the coupling 19 is connected to the yoke 20 with radial play in order to absorb influences of movement between the piston rod and guide rods or to keep them away from the piston rod.
  • Such influences of movement can come, for example, from a load which is attached to the free end face of the yoke 20.
  • the braking device 24 can be seen in particular from FIG. 2.
  • the braking device is accommodated in a cuboid housing 25 and consists of a plurality of segments 26, the inner sides of which rest against the piston rod 17 and the outer sides of which form a circular cylinder against which a rubber sleeve 27 rests. Between this and the inner periphery 25A of the housing 25, an annular space 28 is formed, which can be acted upon by a pressure medium through a bore 29. The pressure medium then presses on the rubber sleeve 27, which presses the segments 26 made of a brake material onto the piston rod 17 and brakes them.
  • the housing 25 of the braking device is fastened to the web 13 by means of a flange 30 and with the aid of screws 31, 32, to be precise on the opposite side of the cylinder head 14.
  • the braking device it is otherwise constructed exactly as described above — is attached to the free end of the cylinder tube 15 or to its cover 16.
  • the piston rod 17 passes through the cover 16 and also penetrates through the braking device to the outside.
  • the braking device described enables a large-area rubber sleeve due to its design, which transmits a high force to the segments 26 and thus a high braking force to the piston rod;
  • the position of the segments is determined by the housing and a stop 33, which is designed as a cover and closes the housing 25.
  • Such a brake unit also has the further advantages that it is self-centering with respect to the piston rod 17 and therefore does not need to be adjusted, furthermore that it acts on the piston rod with large-area brake segments and thus keeps the surface pressure low. On the one hand, this does not damage the piston rod, and on the other hand, high-quality brake materials create little wear.
  • the brake unit is not self-locking, so that an effect proportional to the pressure is achieved, which is a prerequisite for an easily controllable braking process.
  • the working cylinder described with its additional device has a modular structure and in this way enables the expansion of working cylinders into positioning guide units without this modular structure causing disadvantages in terms of increased space requirements. It is particularly suitable for attaching a displacement sensor, e.g. B. on one of the two guide rods 21, 22nd

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Braking Arrangements (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Arbeitszylinder nach der Gattung des Hauptanspruchs. Bei einem derartigen, aus der EP-A 0 124 727 bekannten Arbeitszylinder sind das Zylinderrohr und die miteinander über das Joch verbundenen Führungsstangen an einer nur kurzen, U-förmigen Führungseinheit befestigt bzw. geführt, wodurch der Lastabstand groß und die Belastung der Lager hoch wird. Die Bremseinrichtung hat einen großen Einbauquerschnitt, wirkt mit metallischen Anpreßflächen exzentrisch auf die Kolbenstange und ist verhältnismäßig aufwendig ausgebildet, wodurch sie teuer und voluminös ist und nicht erlaubt, die Bremswirkung gut steuerbar zu dosieren.The invention relates to a cylinder according to the preamble of the main claim. In such a working cylinder known from EP-A 0 124 727, the cylinder tube and the guide rods connected to one another via the yoke are fastened or guided on a short, U-shaped guide unit, as a result of which the load spacing is large and the load on the bearings is high . The braking device has a large installation cross section, acts eccentrically on the piston rod with metallic contact surfaces and is relatively complex, which makes it expensive and voluminous and does not allow the braking effect to be metered in a controllable manner.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Arbeitszylinder mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Führungseinheit sehr leistungsfähig und verhältnismäßig leicht ausgebildet ist, wodurch der Arbeitszylinder einfacher und leichter wird.The cylinder according to the invention with the characterizing features of the main claim has the advantage that the guide unit is very powerful and relatively light, which makes the cylinder easier and lighter.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale möglich. So ist beispielsweise die Bremsein richtung sehr kompakt, einfach und selbstzentrierend aufgebaut und kann beispielsweise auf sehr zweckkmäßige Weise zwischen den die Führungsstangen aufnehmenden Zylindern angeordnet sein.Advantageous further developments and improvements of the features specified in the main claim are possible through the measures listed in the subclaims. For example, the Bremsein direction is very compact, simple and self-centering and can be arranged, for example, in a very practical manner between the cylinders receiving the guide rods.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden beschreibung näher erläutert. Es zeigen Figur 1 eine Draufsicht mit teilweisem Schnitt durch einen Arbeitszylinder, Figur 2 einen Schnitt längs 11-11 nach Figur 1, Figur 3 eine Abwandlung des Ausführungsbeispiels nach Figur 1.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a plan view with a partial section through a working cylinder, FIG. 2 shows a section along 11-11 according to FIG. 1, FIG. 3 shows a modification of the exemplary embodiment according to FIG. 1.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist mit 10 eine Führungseinheit bezeichnet, die aus zwei parallel zueinander verlaufenden Zylindern 11, 12 besteht, die durch einen querverlaufenden Steg 13 miteinander verbunden sind, wodurch die Führungseinheit die Form eines H erhält. An der einen Stirnseite des Stegs 12 ist der Zylinderkopf 14 eines Arbeitszylinders 15 befestigt, dessen anderes Ende durch einen Deckel 16 verschlossen ist. Im Arbeitszylinder ist ein nicht weiter dargestellter, insbesondere doppeltwirkender Kolben dicht gleitend geführt, dessen Kolbenstange 17 zwischen den Zylindem 11 und 12 parallel zu diesen verlaufend nach außen tritt. Am freien Ende der Kolbenstange 17 ist eine Kupplung 19 angeschraubt, die mit einem Joch 20 verbunden ist. An den beiden Enden des Jochs ist je eine Führungsstange 21 bzw. 22 befestigt, die in Bohrungen der Zylinder 11, 12 geführt sind, z. B. in Gleit- oder Kugellagern.In FIG. 1, 10 denotes a guide unit which consists of two cylinders 11, 12 which run parallel to one another and which are connected to one another by a transverse web 13, as a result of which the guide unit is given the shape of an H. On one end face of the web 12, the cylinder head 14 of a working cylinder 15 is fastened, the other end of which is closed by a cover 16. In the working cylinder, a double-acting piston (not shown in any more detail) is guided in a tightly sliding manner, the piston rod 17 of which extends outwards between the cylinders 11 and 12 parallel to these. At the free end of the piston rod 17, a coupling 19 is screwed, which is connected to a yoke 20. At the two ends of the yoke, a guide rod 21 or 22 is attached, which are guided in bores of the cylinders 11, 12, for. B. in plain or ball bearings.

Die Kupplung 19 ist mit radialem Spiel mit dem Joch 20 verbunden, um Bewegungseinflüsse zwischen Kolbenstange und Führungsstangen aufzufangen bzw. von der Kolbenstange fernzuhalten. Derartige Bewegungseinflüsse können beispielsweise von einer Last herkommen, welche an der freien Stirnseite des Jochs 20 befestigt ist.The coupling 19 is connected to the yoke 20 with radial play in order to absorb influences of movement between the piston rod and guide rods or to keep them away from the piston rod. Such influences of movement can come, for example, from a load which is attached to the free end face of the yoke 20.

Die Bremseinrichtung 24 ist insbesondere aus Figur 2 näher erkennbar. Die Bremseinrichtung ist in einem quaderförmigen Gehäuse 25 untergebracht und besteht aus mehreren Segmenten 26, die sich mit ihren Innenseiten an die Kolbenstange 17 anlegen und deren Außenseiten einen Kreiszylinder bilden, an dem eine Gummimanschette 27 anliegt. Zwischen dieser und dem Innenumfang 25A des Gehäuses 25 ist ein Ringraum 28 gebildet, der durch ein Druckmedium über eine Bohrung 29 beaufschlagbar ist. Das Druckmedium drückt dann auf die Gummimanschette 27, welche die aus einem Bremswerkstoff bestehenden Segmente 26 an die Kolbenstange 17 andrückt und diese festbremst.The braking device 24 can be seen in particular from FIG. 2. The braking device is accommodated in a cuboid housing 25 and consists of a plurality of segments 26, the inner sides of which rest against the piston rod 17 and the outer sides of which form a circular cylinder against which a rubber sleeve 27 rests. Between this and the inner periphery 25A of the housing 25, an annular space 28 is formed, which can be acted upon by a pressure medium through a bore 29. The pressure medium then presses on the rubber sleeve 27, which presses the segments 26 made of a brake material onto the piston rod 17 and brakes them.

Das Gehäuse 25 der Bremseinrichtung ist mittels eines Flansches 30 am Steg 13 und mit Hilfe von Schrauben 31, 32 befestigt, und zwar an der gegenüberliegenden Seite des Zylinderkopfs 14.The housing 25 of the braking device is fastened to the web 13 by means of a flange 30 and with the aid of screws 31, 32, to be precise on the opposite side of the cylinder head 14.

Wie das Ausführungsbeispiel nach Figur 3 zeigt, ist die Bremseinrichtung - sie ist im übrigen genauso aufgebaut wie oben beschrieben - am freien Ende des Zylinderrohrs 15 bzw. an dessen Deckel 16 befestigt. In diesem Fall tritt die Kolbenstange 17 durch den Deckel 16 hindurch und dringt ebenfalls durch die Bremseinrichtung hindurch nach außen.As the exemplary embodiment according to FIG. 3 shows, the braking device — it is otherwise constructed exactly as described above — is attached to the free end of the cylinder tube 15 or to its cover 16. In this case, the piston rod 17 passes through the cover 16 and also penetrates through the braking device to the outside.

Die beschriebene Bremseinrichtung ermöglicht durch ihre Ausbildung eine großflächige Gummimanschette, welche eine hohe Kraft auf die Segmente 26 und damit eine hohe Bremskraft auf die Kolbenstange überträgt; Die Lage der Segment ist durch das Gehäuse und einen Anschlag 33 festgelegt, welcher als Deckel ausgebildet ist und das Gehäuse 25 verschließt. Eine derartige Bremseinheit hat zudem die weiteren Vorteile, daß sie selbstzentrierend in bezug auf die Kolbenstange 17 ist und deshalb nicht justiert zu werden braucht, desweiteren, daß sie mit großflächigen Bremssegmenten auf die Kolbenstange wirkt und damit die Flächenpressung gering hält. Dadurch wird einerseits die Kolbenstange nicht beschädigt, andererseits entsteht mit qualitativ hochwertigen Bremsmaterialien nur geringer Abrieb.The braking device described enables a large-area rubber sleeve due to its design, which transmits a high force to the segments 26 and thus a high braking force to the piston rod; The position of the segments is determined by the housing and a stop 33, which is designed as a cover and closes the housing 25. Such a brake unit also has the further advantages that it is self-centering with respect to the piston rod 17 and therefore does not need to be adjusted, furthermore that it acts on the piston rod with large-area brake segments and thus keeps the surface pressure low. On the one hand, this does not damage the piston rod, and on the other hand, high-quality brake materials create little wear.

Die Bremseinheit wirkt nicht selbsthemmend, wodurch eine dem Druck proportionale Wirkung erzielt wird, die Voraussetzung für einen gut steuerbaren Bremsvorgang ist.The brake unit is not self-locking, so that an effect proportional to the pressure is achieved, which is a prerequisite for an easily controllable braking process.

Der beschriebene Arbeitszylinder mit seiner zusätzlichen Einrichtung ist modular aufgebaut und ermöglicht auf diese Weise den Ausbau von Arbeitszylindern zu Positionier-Führungseinheiten, ohne daß durch diesen modularen Aufbau Nachteile im Hinblick auf erhöhten Raumbedarf entstehen würden. Er eignet sich besonders auch zum Anbau eines Wegsensors, z. B. auf einer der beiden Führungsstangen 21, 22.The working cylinder described with its additional device has a modular structure and in this way enables the expansion of working cylinders into positioning guide units without this modular structure causing disadvantages in terms of increased space requirements. It is particularly suitable for attaching a displacement sensor, e.g. B. on one of the two guide rods 21, 22nd

Claims (8)

1. Working cylinder with a pressure-loaded piston guided in a cylinder tube (15) and having a piston rod (17) which is connected by a yoke (20) to two guide rods (21, 22) extending in parallel and on both sides of the cylinder tube and guided in bearings, and with a pressure-loaded braking device (24) for the stop- braking and positioning of the piston rod, characterized in that the bearings are formed in two mutually parallel cylinders (11, 12) which are connected to one another via a transverse web (13) to form an integral H-shaped guide unit (10).
2. Cylinder according to Claim 1, characterized in that the cylinder head (14) of the cylinder tube (15) is connected to the end face of the transverse web (13).
3. Cylinder according to Claim 1 and/or 2, characterized in that the piston rod (17) is connected to the yoke (20) with radial play via a differential coupling (19), in order to prevent motional influences of the guide rods (21, 22) or of the load on the piston rod.
4. Cylinder according to one of Claims 1 to 3, characterized in that the braking device (24) is arranged between the cylinders (11, 12) and is self- centring, and is fastened on that side of the transverse web (13) which is located opposite the cylinder head (14) of the cylinder tube.
5. Cylinder according to one of Claims 1 to 3, characterized in that the braking device (24) is arranged at the free end of the cylinder tube.
6. Cylinder according to one of Claims 1 to 5, characterized in that the braking device (24) has several segments (26) which consist of a braking material and rest by means of their inner faces against the piston rod (17) and the outer faces of which form a circular cylinder, against which rests a sleeve (27) which can be subjected to a pressure medium.
7. Cylinder according to one of Claims 1 to 6, characterized in that the guide rods (21, 22) are mounted in ball guides or sliding guides.
8. Cylinder according to one of Claims 1 to 7, characterized in that the cylinder unit is equipped with a length-measuring system.
EP88102041A 1987-03-05 1988-02-12 Actuator Expired - Lifetime EP0280944B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8703310U DE8703310U1 (en) 1987-03-05 1987-03-05 Working cylinder
DE8703310U 1987-03-05

Publications (2)

Publication Number Publication Date
EP0280944A1 EP0280944A1 (en) 1988-09-07
EP0280944B1 true EP0280944B1 (en) 1990-05-09

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ID=6805474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88102041A Expired - Lifetime EP0280944B1 (en) 1987-03-05 1988-02-12 Actuator

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EP (1) EP0280944B1 (en)
DE (2) DE8703310U1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3820337A1 (en) * 1988-06-15 1989-12-21 Expert Maschbau PISTON-CYLINDER UNIT WITH ROTATIONAL PROTECTED PISTON ROD
DE4230781C2 (en) * 1992-09-15 1996-10-31 Christian Dipl Ing Boehner Fluid-powered linear module for handling systems
ITPD20130023A1 (en) * 2013-01-31 2014-08-01 Vesta Automation Srl DRIVE UNIT FOR CYLINDERS

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371583A (en) * 1966-03-11 1968-03-05 Leland F. Blatt Material-handling device actuator
US3788196A (en) * 1971-08-09 1974-01-29 Ultramation Inc Linear thruster
FR2456268A1 (en) * 1979-05-08 1980-12-05 Bruay Ind Guide for hydraulic or pneumatic jack - has parallel guide bars sliding in guide tubes with fixed power cylinder
EP0124727B1 (en) * 1983-04-06 1987-06-03 Robert Bosch Gmbh Working cylinder
DE3323962A1 (en) * 1983-07-02 1985-01-03 Albert Ing.(grad.) 2800 Bremen Zimmer Anti-rotation locking means on working cylinders operated by pressure medium

Also Published As

Publication number Publication date
DE8703310U1 (en) 1988-06-30
EP0280944A1 (en) 1988-09-07
DE3860135D1 (en) 1990-06-13

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