EP0355179B1 - Linear actuator assembly - Google Patents

Linear actuator assembly Download PDF

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Publication number
EP0355179B1
EP0355179B1 EP88113407A EP88113407A EP0355179B1 EP 0355179 B1 EP0355179 B1 EP 0355179B1 EP 88113407 A EP88113407 A EP 88113407A EP 88113407 A EP88113407 A EP 88113407A EP 0355179 B1 EP0355179 B1 EP 0355179B1
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EP
European Patent Office
Prior art keywords
housing
sensor device
motor
linear drive
drive assembly
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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EP88113407A
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German (de)
French (fr)
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EP0355179A1 (en
Inventor
Kurt Stoll
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Festo SE and Co KG
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Festo SE and Co KG
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 Festo SE and Co KG filed Critical Festo SE and Co KG
Priority to EP88113407A priority Critical patent/EP0355179B1/en
Priority to ES198888113407T priority patent/ES2030811T3/en
Priority to DE8888113407T priority patent/DE3870876D1/en
Priority to JP1183533A priority patent/JP2928276B2/en
Priority to US07/389,004 priority patent/US4987822A/en
Priority to KR1019890011738A priority patent/KR950003066B1/en
Publication of EP0355179A1 publication Critical patent/EP0355179A1/en
Application granted granted Critical
Publication of EP0355179B1 publication Critical patent/EP0355179B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S91/00—Motors: expansible chamber type
    • Y10S91/04—Magnets

Definitions

  • the invention relates to a linear drive device, with a linear motor, in particular pneumatically operated by pressure medium, which has a housing in which there is an axially displaceable piston which is connected to an actuating rod protruding from the motor housing on one working side, in particular as a valve device trained control device for motor control, and with a responsive at certain positions of the actuating rod sensor device, wherein the control device and the sensor device are arranged in the region of the control side opposite the working side of the linear motor and are firmly connected to this to form a jointly manageable work unit.
  • the linear motor is regularly designed as a piston-cylinder unit whose piston rod, which is connected to the piston and protrudes from the cylinder, represents the actuating rod which can be connected to a component to be moved or another power take-off.
  • the linear motor is brought to the desired location and the pressure medium required for actuation, eg compressed air, is brought in or out via pressure medium lines or hoses.
  • the pressure medium flow control devices are used, which are often designed as valve devices and are operated, for example, electrically.
  • a sensor device is provided which operates one or more, for example on an electrical, magnetic, pneumatic or mechanical basis May contain sensors with which predetermined positions of the actuating rod can be detected in order to switch the control device in dependence thereon.
  • a linear drive device of the type mentioned at the outset is known from DE-U-8632990.
  • Your sensor device is formed by a position sensor which can be actuated in a contactless manner and which is mounted together with a solenoid valve forming the valve device in the region of the end face of the linear motor opposite the piston rod.
  • the position sensor responds to the position of the piston and can actuate the solenoid valve to influence the operating state of the linear motor. Since the linear motor, the position sensor and the solenoid valve are combined to form a work unit that can be handled together, rapid assembly is possible at the respective place of use.
  • the known linear drive device has a relatively large width. This results mainly from the sensor device arranged on the outer circumference of the motor housing, which must be attached in the stroke area of the piston responsible for its actuation. In order to obtain a structural unit with the sensor device, the valve device is also provided radially outside the sensor device, as a result of which the overall width is increased again. Ultimately, it would also be problematic to implement a possibly desired adjustability of the sensor device, for which it would be necessary to keep a large part of the circumferential area of the linear motor free for the axial adjustment of the two devices.
  • a switching rod is arranged on the piston side opposite the actuating rod, which is connected to the arrangement consisting of piston and actuating rod so as to be movable and has at least one rod portion on the control side protruding from the motor housing with the sensor device for actuating it cooperating switching section, and that the control device and the sensor device are arranged transversely to the axial direction next to each other in the axial direction following the linear motor on its control side, with a space of movement for the displacement movement of the shift rod being available between the two devices.
  • both the sensor device and the control device are arranged on the control side of the linear motor facing away from the piston rod, so that the peripheral area of the motor housing remains free and even in confined spaces, the drive device can be accommodated without problems is possible.
  • the two devices are practically shielded from the working side by the motor housing, which considerably reduces the risk of damage during operation.
  • the provided shift rod makes it possible to place both devices on the control side, whereby the arrangement of the sensor device and the control device lying next to one another nevertheless enables a relatively short working unit to be realized.
  • the control device can be arranged without problems where it does not hinder or impair the switching processes between the switching rod and the sensor device. In particular, options for axial adjustment of the sensor device can be provided if necessary, without the control device interfering.
  • the control rod also allows easy adjustment of the switching time, since the switching section is arranged outside the linear motor in a clearly recognizable manner.
  • a linear drive device with a sensor device and a control device also emerges from DE-U-8603346.
  • Piezoelectric transducers in the area of the housing faces serve as the control device.
  • the control device formed by a slide valve is located laterally in the circumferential area of the working space receiving the piston, and the use of a switching rod is also not provided.
  • a linear motor results from JP-A-58/83202, the piston of which carries a further rod on the side opposite the actuating rod, which rod participates in the detection of the respective piston position.
  • the sensor device designed as a detector is arranged axially following this rod on the outside of the device housing, as a result of which an increased axial overall length is established.
  • a control device for motor control that can be actuated by means of the sensor device is not provided in this linear drive device.
  • the development according to claim 2 enables a simple and inexpensive construction.
  • the space available for the devices on the control side of the linear motor is optimally used.
  • both the control device and the sensor device are optimally protected, the linear drive device being given a relatively smooth surface on the outside, which considerably facilitates handling.
  • the development according to claim 10 allows a flexible adjustment of the desired switching time.
  • the development according to claim 11 allows a largely dispensing with external lines, which reduces both the manufacturing and assembly costs and the susceptibility to failure.
  • the development according to claim 12 allows a simple, momentary connection of the individual components of the linear drive device to existing pressure medium and / or electrical lines, for example from a bus. This can be electrical and / or pneumatic multi-pin plug are used, so that mix-ups are excluded.
  • a particular advantage of the invention is that the working side of the linear drive device can remain free of any add-on components and there is sufficient space for the power take-off to be actuated.
  • the individual components are outside the working area of the drive device, so that damage is excluded from the outset.
  • the linear drive devices 1, 1 ', 1''shown in FIGS. 1 to 3 each contain a linear motor 2, which is expediently designed in the manner of a piston-cylinder unit. It has a motor housing 3 designed in the manner of a cylinder, which encloses a piston chamber 4, in which there is a piston 6, which can be moved back and forth in the axial direction according to double arrow 5.
  • the piston 6 seals two cylinder spaces 7, 8 from one another in a sealed manner.
  • the cross section of the piston chamber 4 is expediently circular-cylindrical, which simplifies production, and the outer circumference 9 of the motor housing 3 is also kept circular-cylindrical in the exemplary embodiment.
  • the outer circumference can be square or rectangular in cross-section, so that the motor housing 3 has a cuboid shape overall.
  • the piston seals are not shown in the figures, their design is known to the person skilled in the art.
  • actuating rod 14 which runs coaxially to the piston chamber 4 and which crosses the associated cylinder chamber 8 in the longitudinal direction and penetrates the facing end wall 15 of the motor housing 3 with sealing and being guided so as to be displaceable to the surroundings.
  • the end wall 15 can be an integral part of the motor housing 3, but it can also be a separate and in particular detachably fixed cover.
  • the penetration point of the piston rod is indicated at 17; here too, seals have been omitted for the sake of simplicity.
  • the side on which the actuating rod 14 protrudes from the motor housing 3 represents the working side 18 of the linear drive devices 1, 1 ', 1 ⁇ .
  • the actuating rod 14 can be connected to a component to be moved or any power take-off, which in Fig. 1 is indicated by dashed lines at 19. If the two cylinder spaces 7, 8 are filled or ventilated with pressure medium in a suitable manner via corresponding connection openings 20, 21, the piston 6, together with the firmly attached actuating rod 14, performs an axial displacement movement indicated by a double arrow 5, within the scope of which the respective decrease in force 19 is moved in a corresponding manner.
  • the two cylinder spaces 7, 8 each represent work spaces, whereas in the case of modifications of the device according to the invention, not shown, one of the two spaces can also remain depressurized when the piston is returned to an initial position by being acted upon the actuating rod 14 is effected from the outside or via a return spring.
  • control device 22 The control of the pressure medium supply and discharge with respect to the two cylinder spaces 7, 8 is carried out by a schematically indicated control device 22.
  • This is preferably a valve device containing one or more valves, the actuation of which is carried out electrically, and corresponding electrical connection cables are shown in FIGS 1 and 2 indicated by dashed lines at 23.
  • supply lines 24 are connected to the control device 22 (shown in broken lines in FIG. 2), which lead to a pressure medium source 25 and / or pressure medium sink 26, both of which are indicated schematically.
  • the respective linear drive device 1, 1 ', 1 ⁇ also has a sensor device 31 (not shown in Fig. 3) with which certain, previously definable displacement positions of the piston 6 and the actuating rod 14 can be detected in order to depend on certain Shift positions trigger functional processes of external or internal components.
  • the respective signal emitted by the sensor device 31 at the detection times is used internally in that the signals are used to actuate the control device 22.
  • the sensor device 31 for example, end positions of the piston 6, but also intermediate positions, can be detected.
  • the linear motor 2, the control device 22 and the sensor device 31 of the respective Linear drive device 1, 1 ', 1 ⁇ are firmly connected to one another and thus form a compact work unit within which they can be handled together.
  • the work unit thus represents a summary of three components 2, 22, 31 in the exemplary embodiments, which can be assembled uniformly at the place of use, so that complex individual assembly consisting of a large number of individual components is unnecessary.
  • the control device 22 and the sensor device 31 are each arranged on the control side 28 of the linear motor 2 opposite the working side 18, so that the working side 18 can remain free of additional components, which improves the mounting options and damages the devices 22 , 31 is excluded by moving components.
  • a quick exchange can be carried out in the event of a defect, and individual components can also be replaced if necessary in adaptation to the respective operating conditions.
  • the sensor device 31 shown in the exemplary embodiments according to FIGS. 1 and 2 is particularly advantageous. It contains several, for example two, sensors 32 which are designed as proximity switches which can be switched without contact. They work together with a switching section 33, which consists of magnetic material or at least contains magnetic components.
  • the switching section 33 is fastened to one end region of a switching rod 34, which is fixed in particular in the same way as the actuating rod 14 with its opposite end on the piston 6 on the axial side 35 opposite the actuating rod 14.
  • Both rods 14, 34 are preferably arranged coaxially to one another, and it can be two components which are connected to one another and on which the piston 6 is subsequently mounted.
  • the rods 14, 34 can also be separate components which are firmly connected to the piston 6.
  • the switching rod 34 penetrates the End wall 15 opposite axial end wall 36 of the motor housing 3, wherein guide and sealing devices, also not shown, are provided in the penetration area.
  • the switching part 33 accordingly carries out a corresponding axial movement, and the sensors 32 arranged in the axial direction 5 laterally next to their movement path emit a signal at the point in time at which they are radially opposite the switching part 33.
  • the control device 22 and the sensor device 31 are accommodated in a common device housing 37, 37 '.
  • the device housing 37 is a separate component with respect to the motor housing 3, which is fixed to the motor housing 3 and in particular is detachably connected here. It is attached to the motor housing 3 on the control side 28, e.g. as shown in the manner of a flange connection by means of screw connections 38. Since the same outer contour and the same transverse dimensions as for the motor housing 3 have been chosen for the device housing 37, the overall result is an elongated work unit which is narrow across the longitudinal direction.
  • the device housing 37 preferably closes the installation space 39 for the devices 22, 31 from the outside, so that no contamination can occur and trouble-free operation is ensured.
  • One end wall 36 of the motor housing 3 expediently forms a closure cover for the flanged-on device housing 37.
  • the device housing is at least partially formed by the motor housing.
  • a housing 40 which contains both the motor housing 3 and the control device 22 and the sensor device 31 protectively encased.
  • the enveloping housing 40 thus simultaneously forms the device housing 37 ', but which also contains the motor housing 3.
  • both the motor housing 3 and a device housing surrounding the two devices 22, 31 are housed together in an enveloping protective housing.
  • sensors 32 are adjustable in the direction of movement of the shift rod 34, so that the switching time can be variably adjusted.
  • the sensors 32 in the embodiment according to FIG. 1 are adjustably arranged on a longitudinal guide 44 on the inside of the device housing 37.
  • the sensors 32 are arranged on the inside of the enveloping housing 40 and can also be adjustable in a corresponding manner.
  • control device 22 is expediently also fixed on the inside of the device housing 37. It is provided that the control device 22 and the sensor device 31 lie opposite one another transversely to the longitudinal direction 5 and in particular diametrically, so that a movement space 45 for the shift rod 34 remains between the two devices 22, 31. In this way, a short, compact arrangement can be achieved, and since the subunit of the working unit consisting of control device 22 and sensor device 31 is practically completely covered by the motor housing 3 in the longitudinal direction of the linear motor 2 from the working side 18, a slim, outward jagged arrangement.
  • FIG. 4 schematically shows the arrangement of the linear motor 2, the control device 22 and the sensor device 31 within the work unit the linear drive device 1 is indicated, and a three-block arrangement can be seen in which the two devices 22, 31, which are arranged next to one another transversely to the longitudinal direction 5, follow at the same time in the axial direction of view 46 of the linear motor 2.
  • FIG. 5 Another arrangement is shown schematically in FIG. 5, in which the linear motor 2, the sensor device 31 and the control device 22 also represent a three-block unit, the individual components of which are arranged one behind the other in the axial direction 5. This embodiment allows a further reduction in the transverse dimensions.
  • the control device 22 and sensor device 31 are expediently fastened to the inside of this housing 40.
  • the motor housing 3 can expediently be flanged to an end face 41 of the housing 40, the housing 40 having a through opening for the actuating rod 14.
  • the pressure medium connection between the control device 22 and the connection openings 20, 21 on the motor housing 3 takes place via loosely laid pressure medium lines 29. Because of the compact arrangement, the length of the lines can be kept very short, and through the individual housings they can be housed at least partially protected from external influences.
  • the pressure medium lines 29 are designed in the form of pressure medium channels 30 which run in the wall of the motor housing 3 and partially of the device housing 37, so that external lines can be dispensed with if the control device 22 is arranged accordingly. This makes assembly considerably easier. It is also possible, to move to the motor housing 3 by the control device 22 via pressure medium lines, from where the connection to the cylinder spaces 7, 8 is then established via channels formed only in the motor housing 3.
  • connection options 47 shown in dashed lines are provided in FIGS. 1 and 2, which are preferably combined in the form of plug-type connection units and fixed to the device housing 37, 37 '. They are in permanent connection with the corresponding points of the two devices 22, 31 via the cables 23 or supply lines 24 and allow external lines 49, which lead to the pressure medium source 25, pressure medium sink 26 or e.g. an electronic control unit 48 (indicated by dashed lines).
  • connection unit allows the lines 49 to be quickly detachably coupled within the framework of central plug connections, e.g. so-called pneumatic and / or electrical multi-pin plug devices can be used. Connection to a bus is therefore possible without any problems. It is advantageous in all of this if the connection options 47 are arranged on the connection side 50 opposite the working side 18, so that there is no increase in the overall width of the linear drive device even when the connection is established.
  • the invention thus combines various devices to form a structural unit, devices with three or four functional levels being present, depending on the embodiment. 1, 2 and 4, there are three levels, the first level being represented by the linear motor 2, the actuator, the second level by the control device (Processor) and sensor device existing subunit and the third level from the level of connection options 47, the bus level. 5 there are four levels, since the devices 22, 31 are arranged axially one after the other.
  • a major advantage of the invention is that the user can get a complete solution tailored to his problem from a single source, whereas in the past he had to order, store, assemble and maintain a large number of individual components in order to obtain the desired equipment. Commissioning is also much easier with the solution according to the invention, since practically only two plug connections (pneumatic and electrical multi-pin plug) have to be made in order to make the device ready for operation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Linear Motors (AREA)
  • Catching Or Destruction (AREA)
  • Colloid Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft eine Linear-Antriebseinrichtung, mit einem insbesondere pneumatisch druckmittelbetätigten Linearmotor, der über ein Gehäuse verfügt, in dem sich ein in Axialrichtung verschiebbarer Kolben befindet, der mit einer an einer Arbeitsseite aus dem Motorgehäuse herausragenden Betätigungsstange verbunden ist, mit einer insbesondere als Ventileinrichtung ausgebildeten Steuereinrichtung für die Motoransteuerung, und mit einer bei bestimmten Stellungen der Betätigungsstange ansprechenden Sensoreinrichtung, wobei die Steuereinrichtung und die Sensoreinrichtung im Bereich der der Arbeitsseite entgegengesetzten Steuerseite des Linearmotors angeordnet und mit diesem unter Bildung einer gemeinsam handhabbaren Arbeitseinheit fest verbunden sind.The invention relates to a linear drive device, with a linear motor, in particular pneumatically operated by pressure medium, which has a housing in which there is an axially displaceable piston which is connected to an actuating rod protruding from the motor housing on one working side, in particular as a valve device trained control device for motor control, and with a responsive at certain positions of the actuating rod sensor device, wherein the control device and the sensor device are arranged in the region of the control side opposite the working side of the linear motor and are firmly connected to this to form a jointly manageable work unit.

Bei solchen Linear-Antriebseinrichtungen ist der Linearmotor regelmäßig als Kolben-Zylinder-Aggregat ausgebildet, dessen mit dem Kolben verbundene und aus dem Zylinder herausragende Kolbenstange die Betätigungsstange darstellt, die mit einem zu bewegenden Bauteil oder einer anderen Kraftabnahme verbindbar ist. Der Linearmotor wird zum gewünschten Einsatzort gebracht, und das zur Betätigung notwendige Druckmedium, z.B. Druckluft, wird über Druckmittelleitungen oder -schläuche heran- bzw. abgeführt. Zur Steuerung des Druckmittelstromes werden Steuereinrichtungen verwendet, die häufig als Ventileinrichtungen ausgebildet sind und z.B. elektrisch betätigt werden. Um eine automatische Motoransteuerung zu bewirken, ist eine Sensoreinrichtung vorhanden, die einen oder mehrere, z.B. auf elektrischer, magnetischer, pneumatischer oder mechanischer Basis arbeitende Sensoren enthalten kann, mit denen vorherbestimmte Stellungen der Betätigungsstange erfaßt werden können, um in Abhängigkeit davon die Steuereinrichtung zu schalten.In such linear drive devices, the linear motor is regularly designed as a piston-cylinder unit whose piston rod, which is connected to the piston and protrudes from the cylinder, represents the actuating rod which can be connected to a component to be moved or another power take-off. The linear motor is brought to the desired location and the pressure medium required for actuation, eg compressed air, is brought in or out via pressure medium lines or hoses. To control the pressure medium flow control devices are used, which are often designed as valve devices and are operated, for example, electrically. In order to bring about automatic motor control, a sensor device is provided which operates one or more, for example on an electrical, magnetic, pneumatic or mechanical basis May contain sensors with which predetermined positions of the actuating rod can be detected in order to switch the control device in dependence thereon.

Eine Linear-Antriebseinrichtung der eingangs genannten Art geht aus der DE-U-8632990 hervor. Ihre Sensoreinrichtung ist von einem berührungslos betätigbaren Positionssensor gebildet, der zusammen mit einem die Ventileinrichtung bildenden Magnetventil im Bereich der der Kolbenstange entgegengesetzten Stirnseite des Linearmotors angebracht ist. Der Positionssensor spricht auf die Stellung des Kolbens an und kann das Magnetventil betätigen, um den Betriebszustand des Linearmotors zu beeinflußen. Da der Linearmotor, der Positionssensor und das Magnetventil zu einer gemeinsam handhabbaren Arbeitseinheit zusammengefaßt sind, ist am jeweiligen Einsatzort eine rasche Montage möglich.A linear drive device of the type mentioned at the outset is known from DE-U-8632990. Your sensor device is formed by a position sensor which can be actuated in a contactless manner and which is mounted together with a solenoid valve forming the valve device in the region of the end face of the linear motor opposite the piston rod. The position sensor responds to the position of the piston and can actuate the solenoid valve to influence the operating state of the linear motor. Since the linear motor, the position sensor and the solenoid valve are combined to form a work unit that can be handled together, rapid assembly is possible at the respective place of use.

Allerdings verfügt die bekannte Linear-Antriebseinrichtung über eine relativ große Baubreite. Dies resultiert hauptsächlich von der am Außenumfang des Motorgehäuses angeordneten Sensoreinrichtung, die im Hubbereich des für ihre Betätigung zuständigen Kolbens angebracht sein muß. Um eine Baueinheit mit der Sensoreinrichtung zu erhalten, ist zudem die Ventileinrichtung radial außerhalb der Sensoreinrichtung vorgesehen, wodurch sich die Baubreite nochmals vergrößert. Problematisch wäre letztlich auch die Verwirklichung einer evtl. gewünschten Verstellbarkeit der Sensoreinrichtung, für die es erforderlich wäre, einen großen Teil des Umfangbereiches des Linearmotors für die axiale Justierung der beiden Einrichtungen freizuhalten.However, the known linear drive device has a relatively large width. This results mainly from the sensor device arranged on the outer circumference of the motor housing, which must be attached in the stroke area of the piston responsible for its actuation. In order to obtain a structural unit with the sensor device, the valve device is also provided radially outside the sensor device, as a result of which the overall width is increased again. Ultimately, it would also be problematic to implement a possibly desired adjustability of the sensor device, for which it would be necessary to keep a large part of the circumferential area of the linear motor free for the axial adjustment of the two devices.

Es ist daher das Ziel der Erfindung, eine Linear-Antriebseinrichtung gemäß der eingangs genannten Art zu schaffen, die unter Beibehaltung der einheitlich handhabbaren Arbeitseinheit auch bei evtl. gewünschter Justierbarkeit der Sensoreinrichtung kompaktere Querabmessungen besitzt.It is therefore the object of the invention to create a linear drive device according to the type mentioned at the outset which, while maintaining the uniformly manageable working unit, has more compact transverse dimensions even if the sensor device may be desired to be adjustable.

Dieses Ziel wird dadurch erreicht, daß an der der Betätigungsstange entgegengesetzten Kolbenseite eine Schaltstange angeordnet ist, die mit der aus Kolben und Betätigungsstange bestehenden Anordnung mitbewegbar fest verbunden ist und an ihrem an der Steuerseite aus dem Motorgehäuse herausragenden Stangenabschnitt mindestens eine mit der Sensoreinrichtung zu deren Betätigung zusammenarbeitende Schaltpartie aufweist, und daß die Steuereinrichtung und die Sensoreinrichtung quer zur Axialrichtung nebeneinanderliegend in Axialrichtung auf den Linearmotor folgend an dessen Steuerseite angeordnet sind, wobei zwischen den beiden Einrichtungen ein Bewegungsraum für die Verschiebebewegung der Schaltstange zur Verfügung steht.This goal is achieved in that a switching rod is arranged on the piston side opposite the actuating rod, which is connected to the arrangement consisting of piston and actuating rod so as to be movable and has at least one rod portion on the control side protruding from the motor housing with the sensor device for actuating it cooperating switching section, and that the control device and the sensor device are arranged transversely to the axial direction next to each other in the axial direction following the linear motor on its control side, with a space of movement for the displacement movement of the shift rod being available between the two devices.

Man erhält auf diese Weise eine sehr schlank bauende LinearAntriebseinrichtung, bei der sowohl die Sensoreinrichtung als auch die Steuereinrichtung auf der von der Kolbenstange abgewandten Steuerseite des Linearmotors angeordnet ist, so daß der Umfangsbereich des Motorgehäuses freibleibt und auch bei beengten Platzverhältnissen noch eine problemlose Unterbringung der Antriebseinrichtung möglich ist. Zugleich sind die beiden Einrichtungen durch das Motorgehäuse von der Arbeitsseite praktisch abgeschirmt,was die Beschädigungsgefahr im Betrieb erheblich reduziert. Die vorgesehene Schaltstange ermöglicht es, beide Einrichtungen auf die Steuerseite zu legen, wobei sich durch die nebeneinander liegende Anordnung von Sensoreinrichtung und Steuereinrichtung dennoch eine relativ kurz bauende Arbeitseinheit verwirklichen läßt. Die Steuereinrichtung kann problemlos dort angeordnet werden, wo sie die Schaltvorgänge zwischen Schaltstange und Sensoreinrichtung nicht behindert oder beeinträchtigt. Insbesondere können bei Bedarf Möglichkeiten zur axialen Justierung der Sensoreinrichtung vorgesehen werden, ohne daß eine Behinderung durch die Steuereinrichtung eintritt. Die Steuerstange erlaubtzudem eine einfache Einstellung des Schaltzeitpunktes, da die Schaltpartie gut erkennbar außerhalb des Linearmotors angeordnet ist.In this way, a very slim linear drive device is obtained, in which both the sensor device and the control device are arranged on the control side of the linear motor facing away from the piston rod, so that the peripheral area of the motor housing remains free and even in confined spaces, the drive device can be accommodated without problems is possible. At the same time, the two devices are practically shielded from the working side by the motor housing, which considerably reduces the risk of damage during operation. The provided shift rod makes it possible to place both devices on the control side, whereby the arrangement of the sensor device and the control device lying next to one another nevertheless enables a relatively short working unit to be realized. The control device can be arranged without problems where it does not hinder or impair the switching processes between the switching rod and the sensor device. In particular, options for axial adjustment of the sensor device can be provided if necessary, without the control device interfering. The control rod also allows easy adjustment of the switching time, since the switching section is arranged outside the linear motor in a clearly recognizable manner.

Aus der DE-U-8603346 geht ebenfalls eine Linear-Antriebseinrichtung mit einer Sensoreinrichtung und einer Steuereinrichtung hervor. Als Steuereinrichtung dienen piezoelektrische Wandler im Bereich der Gehäuse-Stirnseiten. Die von einem Schieberventil gebildete Steuereinrichtung befindet sich jedoch seitlich im Umfangsbereich des den Kolben aufnehmenden Arbeitsraumes, auch ist die Verwendung einer Schaltstange nicht vorgesehen.A linear drive device with a sensor device and a control device also emerges from DE-U-8603346. Piezoelectric transducers in the area of the housing faces serve as the control device. However, the control device formed by a slide valve is located laterally in the circumferential area of the working space receiving the piston, and the use of a switching rod is also not provided.

Aus der JP-A-58/83202 ergibt sich ein Linearmotor, dessen Kolben an der der Betätigungsstange entgegengesetzten Seite eine weitere Stange trägt, die bei der Detektion der jeweiligen Kolbenstellung mitwirkt. Allerdings ist die als Detektor ausgebildete Sensoreinrichtung axial auf diese Stange folgend an der Außenseite des Einrichtungsgehäuses angeordnet, wodurch sich eine vergrößerte axiale Baulänge einstellt. Eine unter Vermittlung der Sensoreinrichtung betätigbare Steuereinrichtung für die Motoransteuerung ist bei dieser Linear-Antriebseinrichtung nicht vorgesehen.A linear motor results from JP-A-58/83202, the piston of which carries a further rod on the side opposite the actuating rod, which rod participates in the detection of the respective piston position. However, the sensor device designed as a detector is arranged axially following this rod on the outside of the device housing, as a result of which an increased axial overall length is established. A control device for motor control that can be actuated by means of the sensor device is not provided in this linear drive device.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen aufgeführt.Advantageous developments of the invention are listed in the subclaims.

Die Weiterbildung nach Anspruch 2 ermöglicht einen einfachen und kostengünstigen Aufbau. Bei der Weiterbildung nach Anspruch 3 ist der für die Einrichtungen zur Verfügung stehende Platz an der Steuerseite des Linearmotors optimal ausgenutzt.The development according to claim 2 enables a simple and inexpensive construction. In the development according to claim 3, the space available for the devices on the control side of the linear motor is optimally used.

Bei einer Bauform gemäß Anspruch 4 ist ein einfaches Austauschen einzelner Komponenten im Defektfalle möglich. Bei der Weiterbildung nach Anspruch 5 ergibt sich ein Optimum für die Schutzwirkung durch das Motorgehäuse und die Reduzierung der Baubreite.In a design according to claim 4, simple replacement of individual components in the event of a defect is possible. In the development according to claim 5, there is an optimum for the protective effect by the motor housing and the reduction in the overall width.

Bei den Weiterbildungen gemäß den Ansprüchen 6 - 9 ist sowohl die Steuereinrichtung als auch die Sensoreinrichtung optimal geschützt untergebracht, wobei die Linear-Antriebseinrichtung nach außen hin eine relativ glatte Oberfläche erhält, was die Handhabung beträchtlich erleichtert.In the developments according to claims 6-9, both the control device and the sensor device are optimally protected, the linear drive device being given a relatively smooth surface on the outside, which considerably facilitates handling.

Die Weiterbildung nach Anspruch 10 gestattet eine flexible Justierung des jeweils gewünschten Schaltzeitpunktes. Die Weiterbildung nach Anspruch 11 ermöglicht einen weitgehenden Verzicht auf externe Leitungen, was sowohl die Herstellungs- und Montagekosten als auch die Störungsanfälligkeit reduziert.The development according to claim 10 allows a flexible adjustment of the desired switching time. The development according to claim 11 allows a largely dispensing with external lines, which reduces both the manufacturing and assembly costs and the susceptibility to failure.

Die Weiterbildung gemäß Anspruch 12 erlaubt einen einfachen, momentartigen Anschluß der einzelnen Komponenten der LinearAntriebseinrichtung an vorhandene Druckmittel- und/oder Elektroleitungen, z.B. von einem Bus. Hierbei können elektrische und/oder pneumatische Multipolstecker Verwendung finden, so daß Anschlußverwechslungen ausgeschlossen sind.The development according to claim 12 allows a simple, momentary connection of the individual components of the linear drive device to existing pressure medium and / or electrical lines, for example from a bus. This can be electrical and / or pneumatic multi-pin plug are used, so that mix-ups are excluded.

Ein besonderer Vorteil der Erfindung besteht auch darin, daß die Arbeitsseite der Linear-Antriebseinrichtung von jeglichen Anbaukomponenten frei bleiben kann und genügend Platz für die zu betätigende Kraftabnahme vorhanden ist. Außerdem befinden sich die einzelnen Komponenten außerhalb des Arbeitsbereiches der Antriebseinrichtung, so daß Beschädigungen von vornherein ausgeschlossen sind.A particular advantage of the invention is that the working side of the linear drive device can remain free of any add-on components and there is sufficient space for the power take-off to be actuated. In addition, the individual components are outside the working area of the drive device, so that damage is excluded from the outset.

Die Erfindung wird nachfolgend anhand der beiliegenden Zeichnung näher erläutert. In dieser zeigen:

Fig. 1
eine erste Ausführungsform der erfindungsgemäßen Linear-Antriebseinrichtung in stark schematisierter Darstellungsweise im Längsschnitt,
Fig. 2
eine weitere Ausführungsform einer Linear-Antriebseinrichtung in einer der Fig. 1 entsprechenden Darstellungsweise,
Fig. 3
einen vergrößerten Ausschnitt eines weiteren Ausführungsbeispiels einer Linear-Antriebseinrichtung, ebenfalls schematisch und im Querschnitt, und
Fig. 4 und 5
verschiedene Anordnungsmöglichkeiten der Einrichtungskomponenten in schematischer Darstellung.
The invention is explained in more detail below with reference to the accompanying drawing. In this show:
Fig. 1
1 shows a first embodiment of the linear drive device according to the invention in a highly schematic representation in longitudinal section,
Fig. 2
1 shows another embodiment of a linear drive device in a representation corresponding to FIG. 1,
Fig. 3
an enlarged section of a further embodiment of a linear drive device, also schematically and in cross section, and
4 and 5
Different arrangement options of the furnishing components in a schematic representation.

Die in den Fig. 1 bis 3 abgebildeten Linear-Antriebseinrichtungen 1, 1', 1'' enthalten jeweils einen Linearmotor 2, der zweckmäßigerweise in Art eines Kolben-Zylinder-Aggregates ausgebildet ist. Er verfügt über ein in Art eines Zylinders ausgebildetes Motorgehäuse 3, das einen Kolbenraum 4 umschließt, in dem sich ein in Axialrichtung gemäß Doppelpfeil 5 hin und her bewegbar geführter Kolben 6 befindet. Der Kolben 6 trennt zwei Zylinderräume 7, 8 abgedichtet voneinander ab. Der Querschnitt des Kolbenraumes 4 ist zweckmäßigerweise kreiszylindrisch, was die Fertigung vereinfacht, und auch der Außenumfang 9 des Motorgehäuses 3 ist beim Ausführungsbeispiel kreiszylindrisch gehalten. Daneben bestehen aber auch andere Gestaltungsmöglichkeiten, ohne den Erfindungsgedanken zu verlassen, beispielsweise kann der Außenumfang im Querschnitt gesehen quadratisch oder rechteckförmig sein, so daß das Motorgehäuse 3 insgesamt quaderförmige Gestalt hat. Die Kolbendichtungen sind der Einfachheit halber in den Figuren nicht dargestellt, ihre Ausgestaltung ist dem Fachmann bekannt.The linear drive devices 1, 1 ', 1''shown in FIGS. 1 to 3 each contain a linear motor 2, which is expediently designed in the manner of a piston-cylinder unit. It has a motor housing 3 designed in the manner of a cylinder, which encloses a piston chamber 4, in which there is a piston 6, which can be moved back and forth in the axial direction according to double arrow 5. The piston 6 seals two cylinder spaces 7, 8 from one another in a sealed manner. The cross section of the piston chamber 4 is expediently circular-cylindrical, which simplifies production, and the outer circumference 9 of the motor housing 3 is also kept circular-cylindrical in the exemplary embodiment. But there are also also other design options without departing from the inventive concept, for example the outer circumference can be square or rectangular in cross-section, so that the motor housing 3 has a cuboid shape overall. For the sake of simplicity, the piston seals are not shown in the figures, their design is known to the person skilled in the art.

An der einen Axialseite 10 des Kolbens 6 setzt eine koaxial zum Kolbenraum 4 verlaufende Betätigungsstange 14 an, die den zugeordneten Zylinderraum 8 in Längsrichtung durchquert und die zugewandte Stirnwand 15 des Motorgehäuses 3 unter Abdichtung und verschiebbar geführt zur Umgebung hin durchdringt. Die Stirnwand 15 kann einstückiger Bestandteil des Motorgehäuses 3 sein, es kann sich aber auch um einen separaten und insbesondere lösbar fest angebrachten Deckel handeln. Die Durchdringungsstelle der Kolbenstange ist bei 17 angedeutet, auch hier wurde auf die Darstellung von Dichtungen der Einfachheit halber verzichtet.On one axial side 10 of the piston 6 there is an actuating rod 14 which runs coaxially to the piston chamber 4 and which crosses the associated cylinder chamber 8 in the longitudinal direction and penetrates the facing end wall 15 of the motor housing 3 with sealing and being guided so as to be displaceable to the surroundings. The end wall 15 can be an integral part of the motor housing 3, but it can also be a separate and in particular detachably fixed cover. The penetration point of the piston rod is indicated at 17; here too, seals have been omitted for the sake of simplicity.

Die Seite, an der die Betätigungsstange 14 aus dem Motorgehäuse 3 herausragt, stellt die Arbeitsseite 18 der Linear-Antriebseinrichtungen 1, 1′, 1˝ dar. Hier läßt sich die Betätigungsstange 14 mit einem zu bewegenden Bauelement oder jeder beliebigen Kraftabnahme verbinden, die in Fig. 1 beispielhaft gestrichelt bei 19 angedeutet ist. Wenn die beiden Zylinderräume 7, 8 über entsprechende Anschlußöffnungen 20, 21 in geeigneter Weise mit Druckmittel befüllt bzw. belüftet werden, führt der Kolben 6 zusammen mit der fest angebrachten Betätigungsstange 14 eine durch Doppelpfeil 5 angedeutete axiale Verschiebebewegung aus, im Rahmen derer die jeweilige Kraftabnahme 19 in entsprechender Weise bewegt wird. Beim Ausführungsbeispiel stellen die beiden Zylinderräume 7, 8 also jeweils Arbeitsräume dar, wohingegen bei nicht dargestellten Modifikationen der erfindungsgemäßen Einrichtung einer der beiden Räume auch drucklos bleiben kann, wenn die Rückstellung des Kolbens in eine Anfangsstellung durch Beaufschlagung der Betätigungsstange 14 von außen oder über eine Rückstellfeder bewirkt wird.The side on which the actuating rod 14 protrudes from the motor housing 3 represents the working side 18 of the linear drive devices 1, 1 ', 1˝. Here, the actuating rod 14 can be connected to a component to be moved or any power take-off, which in Fig. 1 is indicated by dashed lines at 19. If the two cylinder spaces 7, 8 are filled or ventilated with pressure medium in a suitable manner via corresponding connection openings 20, 21, the piston 6, together with the firmly attached actuating rod 14, performs an axial displacement movement indicated by a double arrow 5, within the scope of which the respective decrease in force 19 is moved in a corresponding manner. In the exemplary embodiment, the two cylinder spaces 7, 8 each represent work spaces, whereas in the case of modifications of the device according to the invention, not shown, one of the two spaces can also remain depressurized when the piston is returned to an initial position by being acted upon the actuating rod 14 is effected from the outside or via a return spring.

Die Steuerung der Druckmittelzufuhr bzw. -abfuhr hinsichtlich der beiden Zylinderräume 7, 8 übernimmt eine schematisch angedeutete Steuereinrichtung 22. Bei dieser handelt es sich vorzugsweise um eine ein oder mehrere Ventile enthaltende Ventileinrichtung, deren Betätigung elektrisch erfolgt,und entsprechende elektrische Anschlußkabel sind in den Fig. 1 und 2 gestrichelt bei 23 angedeutet. An die Steuereinrichtung 22 sind außerdem Zuleitungen 24 angeschlossen (in Fig. 2 gestrichelt dargestellt), die zu einer Druckmittelquelle 25 und/oder Druckmittelsenke 26 führen, die beide schematisch angedeutet sind. Daneben besteht zwischen der Steuereinrichtung 22 und den beiden Anschlußöffnungen 20, 21 des Linearmotors 2 ebenfalls eine Druckmittelverbindung, die über Druckmittelleitungen 29 bewerk stelligt wird (in Fig. 2 gestrichelt angedeutet), die im Falle des Ausführungsbeispiels nach Fig. 3 in noch zu erläuternder Kanalform als Druckmittelkanäle 30 ausgestaltet sind.The control of the pressure medium supply and discharge with respect to the two cylinder spaces 7, 8 is carried out by a schematically indicated control device 22. This is preferably a valve device containing one or more valves, the actuation of which is carried out electrically, and corresponding electrical connection cables are shown in FIGS 1 and 2 indicated by dashed lines at 23. In addition, supply lines 24 are connected to the control device 22 (shown in broken lines in FIG. 2), which lead to a pressure medium source 25 and / or pressure medium sink 26, both of which are indicated schematically. In addition, there is also a pressure medium connection between the control device 22 and the two connection openings 20, 21 of the linear motor 2, which is accomplished via pressure medium lines 29 (indicated by dashed lines in FIG. 2), which, in the case of the exemplary embodiment according to FIG. 3, has a channel shape to be explained are designed as pressure medium channels 30.

Die jeweilige Linear-Antriebseinrichtung 1, 1′, 1˝ verfügt zusätzlich noch über eine Sensoreinrichtung 31 (in Fig. 3 nicht dargestellt), mit der sich bestimmte, vorher festlegbare Verschiebestellungen des Kolbens 6 und der Betätigungsstange 14 detektieren lassen, um in Abhängigkeit bestimmter Verschiebestellungen Funktionsabläufe externer oder interner Bauelemente bzw. Komponenten auszulösen. Beim Ausführungsbeispiel erfolgt eine interne Verwendung des jeweiligen von der Sensoreinrichtung 31 zu den Detektionszeitpunkten ausgesendeten Signals, indem die Signale zur Betätigung der Steuereinrichtung 22 verwendet werden. Mit der Sensoreinrichtung 31 lassen sich beispielsweise Endstellungen des Kolbens 6, aber auch dazwischenliegende Positionen erfassen.The respective linear drive device 1, 1 ', 1˝ also has a sensor device 31 (not shown in Fig. 3) with which certain, previously definable displacement positions of the piston 6 and the actuating rod 14 can be detected in order to depend on certain Shift positions trigger functional processes of external or internal components. In the exemplary embodiment, the respective signal emitted by the sensor device 31 at the detection times is used internally in that the signals are used to actuate the control device 22. With the sensor device 31, for example, end positions of the piston 6, but also intermediate positions, can be detected.

Es ist nun vorgesehen, daß der Linearmotor 2, die Steuereinrichtung 22 und die Sensoreinrichtung 31 der jeweiligen Linear-Antriebseinrichtung 1, 1′, 1˝ fest miteinander verbunden sind und somit eine kompakte Arbeitseinheit bilden, innerhalb derer sie gemeinsam handhabbar sind. Die Arbeitseinheit stellt also eine Zusammenfassung von bei den Ausführungsbeispielen drei Komponenten 2, 22, 31 dar, die einheitlich am Einsatzort montiert werden kann, so daß sich eine aufwendige Einzelmontage bestehend aus einer Vielzahl von Einzelkomponenten erübrigt. Von besonderem Vorteil ist dabei, daß die Steuereinrichtung 22 und die Sensoreinrichtung 31 jeweils auf der der Arbeitsseite 18 entgegengesetzten Steuerseite 28 des Linearmotors 2 angeordnet sind, so daß die Arbeitsseite 18 frei von Zusatzbauteilen bleiben kann, was die Montagemöglichkeiten verbessert und eine Beschädigung der Einrichtungen 22, 31 durch sich bewegende Bauelemente ausschließt.It is now provided that the linear motor 2, the control device 22 and the sensor device 31 of the respective Linear drive device 1, 1 ', 1˝ are firmly connected to one another and thus form a compact work unit within which they can be handled together. The work unit thus represents a summary of three components 2, 22, 31 in the exemplary embodiments, which can be assembled uniformly at the place of use, so that complex individual assembly consisting of a large number of individual components is unnecessary. It is particularly advantageous that the control device 22 and the sensor device 31 are each arranged on the control side 28 of the linear motor 2 opposite the working side 18, so that the working side 18 can remain free of additional components, which improves the mounting options and damages the devices 22 , 31 is excluded by moving components.

Wenn die drei Komponenten 2, 22, 31 wie beim Ausführungsbeispiel lösbar miteinander verbunden sind, läßt sich im Defektfalle ein schneller Austausch vornehmen, außerdem können einzelne Komponenten in Anpassung an die jeweiligen Einsatzbedingungen notfalls ausgetauscht werden.If the three components 2, 22, 31 are detachably connected to one another, as in the exemplary embodiment, a quick exchange can be carried out in the event of a defect, and individual components can also be replaced if necessary in adaptation to the respective operating conditions.

Die in den Ausführungsbeispielen gemäß Fig. 1 und 2 dargestellte Sensoreinrichtung 31 ist besonders vorteilhaft. Sie enthält mehrere, z.B. zwei, Sensoren 32, die als berührungslos schaltbare Näherungsschalter ausgebildet sind. Sie arbeiten mit einer Schaltpartie 33 zusammen, die aus magnetischem Material besteht oder zumindest magnetische Bestandteile enthält. Die Schaltpartie 33 ist am einen Endbereich einer Schaltstange 34 befestigt, die insbesondere in gleicher Weise wie die Betätigungsstange 14 mit ihrem entgegengesetzten Ende am Kolben 6 an der der Betätigungsstange 14 entgegengesetzten Axialseite 35 festgelegt ist. Beide Stangen 14, 34 sind vorzugsweise koaxial zueinander angeordnet, und es kann sich um zwei einstückig miteinander verbundene Bauteile handeln, auf die der Kolben 6 nachträglich aufgezogen ist. Die Stangen 14, 34 können aber auch separate Bauteile sein, die fest mit dem Kolben 6 verbunden sind. Jedenfalls durchdringt die Schaltstange 34 die der Stirnwand 15 entgegengesetzte axiale Stirnwand 36 des Motorgehäuses 3, wobei im Durchdringungsbereich ebenfalls nicht näher dargestellte Führungs- und Dichteinrichtungen vorgesehen sind.The sensor device 31 shown in the exemplary embodiments according to FIGS. 1 and 2 is particularly advantageous. It contains several, for example two, sensors 32 which are designed as proximity switches which can be switched without contact. They work together with a switching section 33, which consists of magnetic material or at least contains magnetic components. The switching section 33 is fastened to one end region of a switching rod 34, which is fixed in particular in the same way as the actuating rod 14 with its opposite end on the piston 6 on the axial side 35 opposite the actuating rod 14. Both rods 14, 34 are preferably arranged coaxially to one another, and it can be two components which are connected to one another and on which the piston 6 is subsequently mounted. The rods 14, 34 can also be separate components which are firmly connected to the piston 6. In any case, the switching rod 34 penetrates the End wall 15 opposite axial end wall 36 of the motor housing 3, wherein guide and sealing devices, also not shown, are provided in the penetration area.

Wenn der Kolben 6 gemäß Doppelpfeil 5 verschoben wird, führt demgemäß die Schaltpartie 33 eine entsprechende Axialbewegung aus, und die in Axialrichtung 5 gesehen seitlich neben deren Bewegungsbahn angeordneten Sensoren 32 senden zu dem Zeitpunkt ein Signal aus, zu dem sie der Schaltpartie 33 radial gegenüberliegen.If the piston 6 is shifted according to the double arrow 5, the switching part 33 accordingly carries out a corresponding axial movement, and the sensors 32 arranged in the axial direction 5 laterally next to their movement path emit a signal at the point in time at which they are radially opposite the switching part 33.

Bei allen abgebildeten Ausführungsbeispielen ist die Steuereinrichtung 22 und die Sensoreinrichtung 31 in einem gemeinsamen Einrichtungsgehäuse 37, 37′ untergebracht. Bei den Ausführungsbeispielen gemäß Fig. 1 und 3 ist das Einrichtungsgehäuse 37 ein mit Bezug zum Motorgehäuse 3 separates Bauteil, das mit dem Motorgehäuse 3 fest und hierbei insbesondere lösbar verbunden ist. Es ist an der Steuerseite 28 am Motorgehäuse 3 befestigt, z.B. wie abgebildet in Art einer Flanschverbindung durch Verschraubungen 38. Da für das Einrichtungsgehäuse 37 die gleiche Außenkontur und die gleichen Querabmessungen wie für das Motorgehäuse 3 gewählt worden sind, ergibt sich insgesamt eine längliche Arbeitseinheit, die quer zur Längsrichtung schmal baut. Das Einrichtungsgehäuse 37 schließt den Einbauraum 39 für die Einrichtungen 22, 31 nach außen hin vorzugsweise ab, so daß keine Verunreinigungen eintreten können und ein störungsfreier Betrieb gewährleistet ist. Zweckmäßigerweise bildet die eine Stirnwand 36 des Motorgehäuses 3 einen Verschlußdeckel für das angeflanschte Einrichtungsgehäuse 37.In all the illustrated exemplary embodiments, the control device 22 and the sensor device 31 are accommodated in a common device housing 37, 37 '. In the exemplary embodiments according to FIGS. 1 and 3, the device housing 37 is a separate component with respect to the motor housing 3, which is fixed to the motor housing 3 and in particular is detachably connected here. It is attached to the motor housing 3 on the control side 28, e.g. as shown in the manner of a flange connection by means of screw connections 38. Since the same outer contour and the same transverse dimensions as for the motor housing 3 have been chosen for the device housing 37, the overall result is an elongated work unit which is narrow across the longitudinal direction. The device housing 37 preferably closes the installation space 39 for the devices 22, 31 from the outside, so that no contamination can occur and trouble-free operation is ensured. One end wall 36 of the motor housing 3 expediently forms a closure cover for the flanged-on device housing 37.

Bei einem nicht näher dargestellten Ausführungsbeispiel ist das Einrichtungsgehäuse zumindest teilweise vom Motorgehäuse gebildet.In one embodiment, not shown, the device housing is at least partially formed by the motor housing.

Beim Ausführungsbeispiel gemäß Fig. 2 ist ein Gehäuse 40 vorgesehen, das sowohl das Motorgehäuse 3 als auch die Steuereinrichtung 22 und die Sensoreinrichtung 31 schützend umhüllt. Hier bildet das umhüllende Gehäuse 40 also gleichzeitig das Einrichtungsgehäuse 37′, das aber zusätzlich noch das Motorgehäuse 3 enthält. Bei einer nicht näher dargestellten Ausführungsform ist vorgesehen, daß sowohl das Motorgehäuse 3 als auch ein die beiden Einrichtungen 22, 31 umgebendes Einrichtungsgehäuse gemeinsam in einem umhüllenden Schutzgehäuse untergebracht sind.In the exemplary embodiment according to FIG. 2, a housing 40 is provided, which contains both the motor housing 3 and the control device 22 and the sensor device 31 protectively encased. Here, the enveloping housing 40 thus simultaneously forms the device housing 37 ', but which also contains the motor housing 3. In one embodiment, not shown, it is provided that both the motor housing 3 and a device housing surrounding the two devices 22, 31 are housed together in an enveloping protective housing.

Neben der bereits oben beschriebenen Sensorart können auch andere Sensoren verwendet werden. Hierbei ist insbesondere an optische, elektronische, induktive oder pneumatische Sensoren gedacht. Vorteilhaft ist aber auf jeden Fall, wenn die Sensoren 32 in Bewegungsrichtung der Schaltstange 34 verstellbar sind, so daß der Schaltzeitpunkt variabel einstellbar ist. Zu diesem Zweck sind die Sensoren 32 beim Ausführungsbeispiel gemäß Fig. 1 an einer Längsführung 44 an der Innenseite des Einrichtungsgehäuses 37 verstellbar angeordnet. Beim Ausführungsbeispiel gemäß Fig. 2 sind die Sensoren 32 an der Innenseite des umhüllenden Gehäuses 40 angeordnet und können auch in entsprechender Weise verstellbar sein.In addition to the type of sensor already described above, other sensors can also be used. In particular, optical, electronic, inductive or pneumatic sensors are considered. However, it is advantageous in any case if the sensors 32 are adjustable in the direction of movement of the shift rod 34, so that the switching time can be variably adjusted. For this purpose, the sensors 32 in the embodiment according to FIG. 1 are adjustably arranged on a longitudinal guide 44 on the inside of the device housing 37. In the exemplary embodiment according to FIG. 2, the sensors 32 are arranged on the inside of the enveloping housing 40 and can also be adjustable in a corresponding manner.

Zurückkommend auf Fig. 1, erkennt man, daß die Steuereinrichtung 22 zweckmäßigerweise ebenfalls an der Innenseite des Einrichtungsgehäuses 37 festgelegt ist. Dabei ist vorgesehen, daß sich die Steuereinrichtung 22 und die Sensoreinrichtung 31 quer zur Längsrichtung 5 und insbesondere diametral mit Abstand gegenüberliegen, so daß zwischen den beiden Einrichtungen 22, 31 ein Bewegungsraum 45 für die Schaltstange 34 verbleibt. Auf diese Weise läßt sich eine kurz bauende, kompakte Anordnung erzielen, und da die aus Steuereinrichtung 22 und Sensoreinrichtung 31 bestehende Untereinheit der Arbeitseinheit in Längsrichtung des Linearmotors 2 von der Arbeitsseite 18 aus gesehen vom Motorgehäuse 3 praktisch vollständig abgedeckt ist, liegt gleichzeitig eine schlanke, nach außen hin unzerklüftete Anordnung vor. In Fig. 4 ist schematisch die Anordnung des Linearmotors 2, der Steuereinrichtung 22 und der Sensoreinrichtung 31 innerhalb der Arbeitseinheit der Linear-Antriebseinrichtung 1 angedeutet, und man erkennt eine Drei-Block-Anordnung, bei der in in Axialrichtung gerichteter Blickrichtung 46 auf den Linearmotor 2 gleichzeitig die beiden Einrichtungen 22, 31 folgen, die quer zur Längsrichtung 5 nebeneinander angeordnet sind.Returning to FIG. 1, it can be seen that the control device 22 is expediently also fixed on the inside of the device housing 37. It is provided that the control device 22 and the sensor device 31 lie opposite one another transversely to the longitudinal direction 5 and in particular diametrically, so that a movement space 45 for the shift rod 34 remains between the two devices 22, 31. In this way, a short, compact arrangement can be achieved, and since the subunit of the working unit consisting of control device 22 and sensor device 31 is practically completely covered by the motor housing 3 in the longitudinal direction of the linear motor 2 from the working side 18, a slim, outward jagged arrangement. 4 schematically shows the arrangement of the linear motor 2, the control device 22 and the sensor device 31 within the work unit the linear drive device 1 is indicated, and a three-block arrangement can be seen in which the two devices 22, 31, which are arranged next to one another transversely to the longitudinal direction 5, follow at the same time in the axial direction of view 46 of the linear motor 2.

Eine andere Anordnungsweise ist schematisch in Fig. 5 abgebildet, bei der der Linearmotor 2, die Sensoreinrichtung 31 und die Steuereinrichtung 22 ebenfalls eine Drei-Block-Einheit repräsentieren, deren einzelne Komponenten in Axialrichtung 5 aufeinanderfolgend hintereinander angeordnet sind. Diese Ausführungsform erlaubt eine weitere Reduzierung der Querabmessungen.Another arrangement is shown schematically in FIG. 5, in which the linear motor 2, the sensor device 31 and the control device 22 also represent a three-block unit, the individual components of which are arranged one behind the other in the axial direction 5. This embodiment allows a further reduction in the transverse dimensions.

Bei der Ausführungsform gemäß Fig. 2, bei der das umhüllende Gehäuse 40 gleichzeitig das Einrichtungsgehäuse 37′ darstellt, sind Steuereinrichtung 22 und Sensoreinrichtung 31 zweckmäßigerweise an der Innenseite dieses Gehäuses 40 befestigt. Gleiches gilt für das Motorgehäuse 3, das zweckmäßigerweise an einer Stirnseite 41 des Gehäuses 40 angeflanscht sein kann, wobei das Gehäuse 40 eine Durchgangsöffnung für die Betätigungsstange 14 aufweist.In the embodiment according to FIG. 2, in which the enveloping housing 40 simultaneously represents the device housing 37 ', the control device 22 and sensor device 31 are expediently fastened to the inside of this housing 40. The same applies to the motor housing 3, which can expediently be flanged to an end face 41 of the housing 40, the housing 40 having a through opening for the actuating rod 14.

Bei den Ausführungsbeispielen gemäß Fig. 1 und 2 erfolgt die Druckmittelverbindung zwischen der Steuereinrichtung 22 und den Anschlußöffnungen 20, 21 am Motorgehäuse 3 über lose verlegte Druckmittelleitungen 29. Wegen der kompakten Anordnung kann die Länge der Leitungen sehr gering gehalten werden, und durch die einzelnen Gehäuse können sie zumindest zum Teil von äußeren Einflüssen geschützt untergebracht werden. Beim Ausführungsbeispiel gemäß Fig. 3 ist eine andere Variante realisiert. Dort sind die Druckmittelleitungen 29 in Gestalt von Druckmittelkanälen 30 ausgebildet, die in der Wandung des Motorgehäuses 3 und teilweise des Einrichtungsgehäuses 37 verlaufen, so daß bei entsprechender Anordnung der Steuereinrichtung 22 auf externe Leitungen verzichtet werden kann. Dies erleichtert die Montage erheblich. Es ist auch möglich, von der Steuereinrichtung 22 über Druckmittelleitungen das Motorgehäuse 3 anzufahren, von wo aus anschließend über lediglich im Motorgehäuse 3 ausgebildete Kanäle die Verbindung zu den Zylinderräumen 7, 8 erfolgt.In the exemplary embodiments according to FIGS. 1 and 2, the pressure medium connection between the control device 22 and the connection openings 20, 21 on the motor housing 3 takes place via loosely laid pressure medium lines 29. Because of the compact arrangement, the length of the lines can be kept very short, and through the individual housings they can be housed at least partially protected from external influences. Another variant is realized in the embodiment according to FIG. 3. There, the pressure medium lines 29 are designed in the form of pressure medium channels 30 which run in the wall of the motor housing 3 and partially of the device housing 37, so that external lines can be dispensed with if the control device 22 is arranged accordingly. This makes assembly considerably easier. It is also possible, to move to the motor housing 3 by the control device 22 via pressure medium lines, from where the connection to the cylinder spaces 7, 8 is then established via channels formed only in the motor housing 3.

Die Zufuhr der für den Betrieb der Linear-Antriebseinrichtungen 1, 1′, 1˝ notwendigen Energie erfolgt von außen über bereits erwähnte Druckmittelzuleitungen 24 und elektrische Anschlußkabel 23, die auch für die Sensoreinrichtung 31 zuständig sein können. Um nicht jede Leitung bzw. jedes Kabel einzeln verlegen zun müssen, ist vorgesehen, daß in den Fig. 1 und 2 gestrichelt dargestellte Anschlußmöglichkeiten 47 vorhanden sind, die vorzugsweise in Gestalt steckerartiger Anschlußeinheiten zusammengefaßt und am Einrichtungsgehäuse 37, 37′ festgelegt sind. Sie stehen über die Kabel 23 bzw. Zuleitungen 24 in dauernder Verbindung mit den entsprechenden Stellen der beiden Einrichtungen 22, 31 und erlauben von außen her der Anschluß externer Leitungen 49, die zur Druckmittelquelle 25, Druckmittelsenke 26 oder z.B. einer elektronischen Steuereinheit 48 (gestrichelt angedeutet) führen können. Die Ausbildung als Anschlußeinheit gestattet es, die Leitungen 49 im Rahmen zentraler Steckverbindungen schnell lösbar anzukuppeln, wobei z.B. sogenannte pneumatische und/oder elektrische Multipolsteckereinrichtungen Verwendung finden können. Der Anschluß an einen Bus ist somit problemlos möglich. Vorteilhaft ist bei alledem, wenn die Anschlußmöglichkeiten 47 an der der Arbeitsseite 18 entgegengesetzten Anschlußseite 50 angeordnet sind, so daß auch bei hergestellter Anschlußverbindung keine Vergrößerung der Baubreite der Linear-Antriebseinrichtung eintritt.The supply of the energy required for the operation of the linear drive devices 1, 1 ', 1˝ takes place from the outside via already mentioned pressure medium supply lines 24 and electrical connecting cables 23, which can also be responsible for the sensor device 31. In order not to have to lay each line or each cable individually, it is provided that connection options 47 shown in dashed lines are provided in FIGS. 1 and 2, which are preferably combined in the form of plug-type connection units and fixed to the device housing 37, 37 '. They are in permanent connection with the corresponding points of the two devices 22, 31 via the cables 23 or supply lines 24 and allow external lines 49, which lead to the pressure medium source 25, pressure medium sink 26 or e.g. an electronic control unit 48 (indicated by dashed lines). The design as a connection unit allows the lines 49 to be quickly detachably coupled within the framework of central plug connections, e.g. so-called pneumatic and / or electrical multi-pin plug devices can be used. Connection to a bus is therefore possible without any problems. It is advantageous in all of this if the connection options 47 are arranged on the connection side 50 opposite the working side 18, so that there is no increase in the overall width of the linear drive device even when the connection is established.

Durch die Erfindung werden also verschiedene Einrichtungen zu einer baulichen Einheit zusammengefaßt, wobei je nach Ausführungsform Einrichtungen mit drei oder vier funktionellen Ebenen vorhanden sind. Gemäß Fig. 1, 2 und 4 sind drei Ebenen vorhanden, wobei die erste Ebene vom Linearmotor 2, dem Aktor, repräsentiert wird, die zweite Ebene durch die aus Steuereinrichtung (Prozessor) und Sensoreinrichtung bestehende Untereinheit und die dritte Ebene von der Ebene der Anschlußmöglichkeiten 47, der Busebene. Beim Ausführungsbeispiel gemäß Fig. 5 sind vier Ebenen vorhanden, da die Einrichtungen 22, 31 axial aufeinanderfolgend angeordnet sind.The invention thus combines various devices to form a structural unit, devices with three or four functional levels being present, depending on the embodiment. 1, 2 and 4, there are three levels, the first level being represented by the linear motor 2, the actuator, the second level by the control device (Processor) and sensor device existing subunit and the third level from the level of connection options 47, the bus level. 5 there are four levels, since the devices 22, 31 are arranged axially one after the other.

Ein wesentlicher Vorteil der Erfindung liegt auch darin, daß der Anwender eine komplette, auf sein Problem zugeschnittene Lösung aus einer Hand erhalten kann, während er früher eine Vielzahl von Einzelkomponenten bestellen, lagerhalten, montieren und warten mußte, um die gewünschte Einrichtung zu erhalten. Auch die Inbetriebnahme ist mit der erfindungsgemäßen Lösung wesentlich einfacher, da praktisch nur zwei Steckverbindungen (pneumatischer und elektrischer Multipolstecker) hergestellt werden müssen, um die Einrichtung betriebsbereit zu machen.A major advantage of the invention is that the user can get a complete solution tailored to his problem from a single source, whereas in the past he had to order, store, assemble and maintain a large number of individual components in order to obtain the desired equipment. Commissioning is also much easier with the solution according to the invention, since practically only two plug connections (pneumatic and electrical multi-pin plug) have to be made in order to make the device ready for operation.

Claims (12)

  1. Linear drive assembly, with a linear motor (2), in particular pneumatic and pressure-medium-operated, which has a housing (3) in which is located a piston (6) capable of movement in the axial direction (5) and connected to an actuating rod (18) protruding from the motor housing (3) on one operating side (18), with a control element (22), in particular in the form of a valve assembly, to control the motor, and with a sensor device (13) responding at particular positions of the actuating rod (14), in which the control element (22) and the sensor device (31) are located in that area of the control side (28) of the linear motor (2) opposite the operating side (18) and are permanently connected to the linear motor so as to form a single, easily-handled operating unit, characterized in that, on that piston side (35) opposite the actuating rod (14) is mounted a switch rod (34), permanently connected to and able to move with the assembly comprising the piston (6) and actuating rod (14), and having on that section of rod projecting from the motor housing (3) on the control side (28) one or more switch sections (33) working in conjunction with the sensor device (31) for its actuation, and that the control element (22) and the sensor device (31) are mounted consecutively alongside one another at right-angles to the axial direction (5), on the control side (28) of the linear motor (2) in the axial direction (5), With room for movement (45) for the sliding motion of the switch rod (34) between the two elements (22, 31).
  2. Linear drive assembly according to claim 1, characterized in that the switch rod (34) is mounted coaxially to the actuating rod (14).
  3. Linear drive assembly according to claims 1 or 2, characterized in that the control element (22) and the sensor device (31) lie diametrically opposite one another.
  4. Linear drive assembly according to any of claims 1 to 3, characterized in that the linear motor (2), the control element (22) and the sensor drive (31) are detachable and in particular are joined to one another so as to be replaceable.
  5. Linear drive assembly according to any of claims 1 to 4, characterized in that sub-unit containing the control element (22) and sensor device (31) is completely covered by the motor housing (3), viewed in the longitudinal direction (5) of the linear motor (2) from the operating side (18).
  6. Linear drive assembly according to any of claims 1 to 5, characterized in that the control element (22) and the sensor device (31) are accommodated in a common equipment housing (37, 37').
  7. Linear drive assembly according to claim 6, characterized in that the equipment housing is formed at least partially by the motor housing.
  8. Linear drive assembly according to claim 6, characterized in that the equipment housing (37) is firmly but releasably secured to the motor housing (3) on the control side (28) of the linear motor (2), e.g. by a bolted connection (38) in the form of a flanged connection.
  9. Linear drive assembly according to any of claims 6 to 8, characterized in that the motor housing (3) and the control element (22) together with the sensor device (31) are accommodated in a common encasing housing (40), whereby the two elements (22, 31) can also be mounted in an equipment housing located inside the encasing housing (40).
  10. Linear drive assembly according to any of claims 1 to 9, characterized in that the sensor device (31) has one or more sensors (32), expediently adjustable in the direction of movement of the switch rod (34), in particular in the form of a non-contacting proximity sensor responding to the switch section (33).
  11. Linear drive assembly according to any of claims 1 to 10, characterized in that the control element (22) is connected via pressure medium lines (29) with at least one of the two cylinder chambers (7, 8) separated from one another by the piston (6) of the motor housing (31), which run in the area of the housing, and may be in the form of pressure medium ducts (30) formed at least in part by the housing walls.
  12. Linear drive assembly according to any of claims 1 to 11, characterized in that there are connections (47) linked to the control element (22) and the sensor device (31) for external electrical and/or pneumatic lines (49) or the like, located expediently on the connection side (50) of the operating unit opposite the operating side (18) and in particular combined to form plug or socket type connection units, which may if necessary be located on the equipment housing (37, 37').
EP88113407A 1988-08-18 1988-08-18 Linear actuator assembly Expired - Lifetime EP0355179B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP88113407A EP0355179B1 (en) 1988-08-18 1988-08-18 Linear actuator assembly
ES198888113407T ES2030811T3 (en) 1988-08-18 1988-08-18 LINEAR IMPULSION DEVICE.
DE8888113407T DE3870876D1 (en) 1988-08-18 1988-08-18 LINEAR DRIVE DEVICE.
JP1183533A JP2928276B2 (en) 1988-08-18 1989-07-14 Linear drive
US07/389,004 US4987822A (en) 1988-08-18 1989-08-02 Linear actuator
KR1019890011738A KR950003066B1 (en) 1988-08-18 1989-08-18 Liner-actuator assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88113407A EP0355179B1 (en) 1988-08-18 1988-08-18 Linear actuator assembly

Publications (2)

Publication Number Publication Date
EP0355179A1 EP0355179A1 (en) 1990-02-28
EP0355179B1 true EP0355179B1 (en) 1992-05-06

Family

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EP88113407A Expired - Lifetime EP0355179B1 (en) 1988-08-18 1988-08-18 Linear actuator assembly

Country Status (6)

Country Link
US (1) US4987822A (en)
EP (1) EP0355179B1 (en)
JP (1) JP2928276B2 (en)
KR (1) KR950003066B1 (en)
DE (1) DE3870876D1 (en)
ES (1) ES2030811T3 (en)

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Also Published As

Publication number Publication date
DE3870876D1 (en) 1992-06-11
US4987822A (en) 1991-01-29
EP0355179A1 (en) 1990-02-28
JPH0266304A (en) 1990-03-06
KR900003544A (en) 1990-03-26
ES2030811T3 (en) 1992-11-16
KR950003066B1 (en) 1995-03-30
JP2928276B2 (en) 1999-08-03

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