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EP2369172A2 - Fluid rotation machine with a sensor assembly - Google Patents

Fluid rotation machine with a sensor assembly Download PDF

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Publication number
EP2369172A2
EP2369172A2 EP11001518A EP11001518A EP2369172A2 EP 2369172 A2 EP2369172 A2 EP 2369172A2 EP 11001518 A EP11001518 A EP 11001518A EP 11001518 A EP11001518 A EP 11001518A EP 2369172 A2 EP2369172 A2 EP 2369172A2
Authority
EP
European Patent Office
Prior art keywords
sensor
housing
rotary machine
shaft
encoder
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.)
Granted
Application number
EP11001518A
Other languages
German (de)
French (fr)
Other versions
EP2369172B1 (en
EP2369172A3 (en
Inventor
Tom Tychsen
Dietmar Weiss
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.)
Danfoss Power Solutions ApS
Original Assignee
Sauer Danfoss ApS
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 Sauer Danfoss ApS filed Critical Sauer Danfoss ApS
Publication of EP2369172A2 publication Critical patent/EP2369172A2/en
Publication of EP2369172A3 publication Critical patent/EP2369172A3/en
Application granted granted Critical
Publication of EP2369172B1 publication Critical patent/EP2369172B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C2/00—Rotary-piston engines
    • F03C2/08—Rotary-piston engines of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/103—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member one member having simultaneously a rotational movement about its own axis and an orbital movement
    • F04C2/104—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member one member having simultaneously a rotational movement about its own axis and an orbital movement having an articulated driving shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/05—Speed
    • F04C2270/052—Speed angular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/86—Detection

Definitions

  • the invention relates to a fluid rotary machine comprising a housing, a shaft guided out of the housing and a sensor arrangement which has an encoder, which is in operative connection with the shaft, and a receiver.
  • Such a machine is off US Pat. No. 6,539,710 B2 known.
  • the first section has an externally toothed gear which cooperates with an internally toothed ring gear. Between the gear and the ring gear pressure pockets are formed, which are supplied via a rotating valve spool assembly each with pressurized fluid or connected to a low pressure region.
  • the gear is connected via a cardan shaft with the shaft.
  • the gear is engaged with a crankpin, which transmits the orbiting motion of the gear to a sensor shaft.
  • US 4,593,555 describes a hydraulic motor in which one uses a pressure sensor to determine the rotational speed of the shaft.
  • US Pat. No. 6,062,123 describes a power-assisted steering device with a motor and a sensor that scans a position of a steering handwheel shaft.
  • the sensor is arranged radially to the axis of the steering wheel shaft.
  • DE 198 24 926 C2 describes a further hydraulic steering device, in which an inner spool is provided on its front side with a row of teeth that can be scanned by a sensor.
  • DE 10 2005 036 483 B4 describes a hydraulic rotary machine whose shaft is provided with a donor having on its outer periphery a tooth structure of teeth and grooves.
  • a transmitter is arranged, which directs a light beam to the threaded structure. From the thread structure of the light beam is reflected to a receiver.
  • the sensor arrangements in the machines mentioned in the introduction have proven themselves in principle. But they often require a relatively complicated installation of the sensor. The sensor is then often in a position where it basically bothers. If the sensor is placed in a position where it interferes less, there is the problem that it can not directly detect the rotation of the shaft, but is in communication with the shaft through a plurality of play-engaged engagement points. A similar problem arises when the shaft can twist, for example, at high torques within the movement train.
  • the invention has the object of advantageously arranging the sensor arrangement on the fluid rotary machine.
  • the sensor arrangement has a receiving area in which the encoder is arranged, wherein the receiving area is in fluid communication with the interior of the housing and is sealed to the outside and the receiver outside of Housing and the receiving area is arranged.
  • the receiving area seals the interior of the machine to the outside, so that one in the sensor assembly requires no opening through which a moving element is guided and must then be sealed. If you can save a seal between moving parts, this increases the reliability. The wear remains small and the susceptibility to errors decreases.
  • hydraulic fluid may enter the receiving area and then simultaneously lubricate the contact surfaces of the transmitter with the housing or other element. This in turn means that the encoder can rotate virtually freely, so that an extremely small moment is required to turn the encoder. This in turn keeps the twist of the transmission element very small when using a transmission element.
  • a particularly simple embodiment is to arrange the receiving area within the housing.
  • the receiving area may be formed as a receiving space.
  • the receiving area is formed in an end cap of the fluid rotary machine.
  • the receiving area may be formed, for example, as a bore or as a recess in the front cover. There will be no through hole provided. Otherwise, the tightness would no longer be guaranteed. Again, you need in the sensor assembly no opening through which a moving element is performed. You can make the front cover or other parts of the housing made of stainless steel. A Interaction between donor and receiver is not disturbed when the interaction is due to a magnetic field.
  • the encoder on a support member which cooperates with low friction with the end cover.
  • the sensor arrangement has a sensor housing in which the receiving area is arranged.
  • it is the sensor housing that seals the interior of the machine to the outside.
  • no opening for a moving element is required in the sensor assembly, which would have to be sealed.
  • the sensor housing can be manufactured as a separate component. This simplifies the production on the one hand.
  • the sensor housing can be particularly well adapted to the needs of the sensor arrangement, in particular to that of the encoder.
  • the encoder has a carrier element which cooperates with low friction with the sensor housing.
  • the sensor arrangement even if a liquid or a fluid which penetrates into the receiving area does not have a lubricating effect per se, as is the case, for example, with water-hydraulic machines.
  • the sensor housing is screwed into a front cover of the fluid rotary machine.
  • the sensor housing has for this purpose, for example, an external thread, which is in engagement with a corresponding internal thread in the end cap. This simplifies the manufacture of the sensor housing and the mounting of the sensor arrangement on the machine. Moreover, in this embodiment, it is relatively easy to seal the receiving area to the outside. You just have to arrange a seal between the sensor housing and the front cover and screw the sensor housing with sufficient force in the front cover.
  • the receiver is clipped onto the sensor housing. So you connect the receiver to the sensor housing with a detachable connection that can be made relatively quickly and released again.
  • This has the advantage that the fluid rotary machine can be relatively easily provided with different types of sensor arrangements by replacing the receiver. Also, a repair is simplified. In a sensor arrangement, the receiver is usually the most error-prone part.
  • the encoder has a magnet.
  • the magnet generates the magnetic field, which is also measurable at the receiver.
  • the magnetic field has to be only a few millitesla. If the magnet is moved due to a movement of the encoder caused by the shaft itself, this causes a change in the magnetic field at the recipient's place. It is also possible that several magnets are arranged on the encoder. Due to the varying magnetic field, the receiver can then draw conclusions about the movement of the encoder and thus the shaft. If the transmitter has a magnet, ideally the sensor housing will be made of a material that is non-magnetic, so that the magnetic field at the receiver is undisturbed.
  • the receiver has a magnetoresistive or a Hall sensor element.
  • a magnetoresistive element changes its electrical resistance when an external magnetic field is applied. This can then be read out.
  • a Hall sensor element when current flows through it, provides an output voltage that is proportional to a vertical component of the magnetic field and the current. That is, even with a non-moving magnet, unlike a coil magnet arrangement, a current can always be read out.
  • the transmitter and receiver elements of a Hall, rotation, speedometer generator or optical sensor With all these sensors, the rotating movement of the shaft, which is in operative connection with the encoder, can be detected.
  • the transmitter has a magnet and the receiver has a Hall sensor.
  • the speedometer generator supplies a voltage proportional to the speed.
  • an LED can scan the sensor through a transparent sensor housing.
  • the sensor arrangement preferably has an output element for outputting a quadrilateral signal.
  • the output element can also output an analog current signal, which varies in particular between 2 milliamps and 20 milliamps.
  • an analog voltage signal may be output that typically varies between 0.1 volts and 0.9 volts.
  • a quadrilateral signal has the advantage that it is less sensitive to noise. For example, one can select a quadrature signal as a TTL signal.
  • the sensor arrangement has a memory in which at least two values can be stored.
  • the storage of two values in the memory can be used in particular to determine a direction of rotation of the shaft. For example, one can first normalize two values stored at different times, and then calculate a rotational speed from them taking into account the transition from 360 ° to 0 °.
  • An in Fig. 1 illustrated hydraulic motor 1 has a housing 2, from which a shaft 3 is led out. On the shaft 3, a mechanical power can be removed.
  • the shaft 3 is rotatable about an axis 4. It forms the part of a movement train, which in addition to the shaft 3 has a propeller shaft 5 and an externally toothed gear 6, which is arranged in an internally toothed toothed ring 7 and forms with the toothed ring 7 in a conventional manner pressure pockets which, depending on their Position are supplied with hydraulic fluid under pressure or hydraulic fluid to a low pressure port can dismiss.
  • a schematically illustrated spool 8 is provided, which is connected to the shaft 3.
  • the motion strand thus has, with the gear 6, a first section which orbits around the axis 4. Furthermore, the movement strand in the region of the shaft 3 has a second section which rotates about the axis 4.
  • the housing 2 is closed on the opposite side of the shaft by a front cover 9. Outside on the front cover 9, a sensor arrangement 10 is arranged. However, the sensor arrangement 10 can also be arranged at least partially in the housing 2 or in the front cover 9. With the sensor assembly 10, the rotation of the shaft 3 should be detected as accurately as possible.
  • the sensor arrangement 10 can have a sensor housing 11 which surrounds a receiving area in which an encoder 12 is arranged.
  • the receiving area may be formed as a receiving space.
  • the encoder 12 has a support member 13 which is formed of a material which cooperates with low friction with the material of the sensor housing 11.
  • On the carrier element one or more donor elements are arranged.
  • the encoder elements 14 are formed as magnets 29 and as permanent magnets.
  • On the outside of the sensor housing 11, a receiver 15 is arranged, which by the magnetic field of the donor elements 14 is applied and passed on a non-illustrated line or wireless electrical signals containing the information about the rotational movement of the shaft 3, and a controller, not shown.
  • the front cover 9 has centrally a through opening 16. Via the passage opening 16, the interior of the housing 2 is in communication with the receiving area of the sensor housing 11, so that hydraulic fluid can also penetrate from the interior of the housing 2 into the interior of the sensor housing 11. Between the sensor housing 11 and the end cover 9, a seal 17 is arranged so that the hydraulic fluid can not escape to the outside. The necessary sealing forces are ensured by a mounting arrangement with which the sensor housing 11 is attached to the front cover 9. This fastening arrangement is symbolized here by a screw 18. In fact, a plurality of screws 18 will be provided.
  • the sensor housing 11 is formed of a material that is non-magnetic and that allows the magnetic field from the donor elements 14 pass, so that this magnetic field can be detected by the receiver 15.
  • the encoder 12 may have a carrier element 13. It is advantageous if the support element 13 cooperates with low friction with the end cover 9. If the encoder 12 in the sensor housing 11 is described below or in the preceding, it is alternatively always possible for the encoder 12 to be arranged generally in the receiving area and in particular in the housing 2 or in the front cover 9.
  • the carrier element 13 is connected via a transmission element 19 to a second section of the movement strand, which rotates about the axis 4. This is the end of the propeller shaft 5, which is engaged with the shaft 3 via a Vernierungsgeomtrie 20.
  • the transmission element 19 is designed as a tachometer shaft, ie it is torsionally rigid.
  • the encoder 12 thus always has exactly the same angular position as the shaft 3 with a high degree of accuracy.
  • the deviation amounts to a maximum of 5 °, preferably even to a maximum of 2 ° and in particularly preferred cases to a maximum of 1 °.
  • the cardan shaft has a longitudinal channel 21, which also passes through the first section of the movement strand.
  • the gear 6 rotates at the same speed as the cardan shaft 5 and thus at the same speed as the transmission element 19.
  • a tachometer shaft instead of a tachometer shaft, one can also use another transmission element, for example a thin metal rod or the like.
  • FIG Fig. 2 In order to eliminate this deviation, one can use an embodiment as shown in FIG Fig. 2 is shown. Here, the same elements are provided with the same reference numerals.
  • the transmission element 19 is formed here longer than in the embodiment according to Fig. 1 so it's immediate can be fixed in the shaft 3. A possible play in the gearing geometry 20 then no longer plays a role.
  • the transmission element 19 is rotatably connected to the encoder 12 and / or with the shaft 3, but slidably connected in a direction parallel to the axis 4.
  • These ends of the transmission element 19 are then guided into corresponding recesses in the transmitter 12 and / or in the shaft 3, which have a corresponding polygonal cross-section. This allows the end to be displaced axially to a certain extent in the respective recesses, so that a change in length of the transmission element 19 can be accommodated, as may arise, for example, in the event of a temperature change.
  • Fig. 3 shows another hydraulic machine. Same elements as in the Fig. 1 and 2 are provided with the same reference numerals.
  • the shaft 3 is connected via a tooth geometry 20 with the propeller shaft 5, which in turn is connected via a second tooth geometry 22 with the gear 6.
  • a second propeller shaft 23 is provided to connect the gear 6 with the valve spool 8, which rotates together with the shaft 3 to the formed between the gear 6 and the toothed ring 7 Pressure pockets to supply the hydraulic fluid position correct.
  • the transmission element 19 is connected at one end to the shaft 3 and at the other end to the encoder 12. Accordingly, the encoder 12 with high accuracy the same angular position as the shaft 3. Game in the toothing geometries 20, 22 is without influence.
  • Fig. 3b shows an enlarged view of a detail B from Fig. 3a ie the sensor arrangement 10.
  • Fig. 3b shows a section CC after Fig. 3c , It can be seen that the transmission element 19 has at its end, which is received in the support member 13, a square cross-section and the support member 13 has a corresponding receptacle.
  • the sensor housing 11 is formed, for example, of stainless steel and the support member 13 made of a plastic, preferably PEEK (polyetheretherketones).
  • magnets 29 instead of magnets 29 as donor elements 14, of course, other donor elements can be used.
  • the transmitter element 14 may also have an optical marking which is externally provided by the sensor housing 11, the housing 2 or the end cover 9 scanned through can be.
  • the radiation does not necessarily have to be visible radiation. It is also possible to use radiation in the infrared or ultraviolet range. Other electromagnetic waves can, if they can penetrate the sensor housing 11, the housing 2 or the front cover 9, are used for the signal transmission from the transmitter 12 to the outside.
  • the sensor housing 11 is sealed by the seal 17 with respect to the end cover 9. Accordingly, although hydraulic fluid can penetrate into the interior of the sensor housing 11, but not to the outside.
  • the sensor housing 11 is designed so that it can absorb the pressures occurring in the interior of the housing 2. However, no seals are required in order to seal off moving parts in the area of the sensor arrangement 10.
  • Fig. 4a shows an embodiment similar to the embodiment according to Fig. 3a , The same elements are provided with the same reference numerals.
  • the transmission element 19 is connected to the propeller shaft 5 and indeed at the end which faces away from the shaft 3.
  • the transmission element 19 is indeed arranged eccentrically in this area.
  • the transmission element 19 is subjected to bending only to an extent that it can withstand during operation in the long term.
  • a second difference relates to the sensor arrangement 10, which in Fig. 4b is shown enlarged.
  • the sensor housing 11 has an external thread 24 which is screwed into an internal thread 25 in the passage opening 16 in the front cover 9. As a result, both the production of the sensor housing 11 and the mounting of the sensor housing 11 is simplified.
  • the sensor housing 11 may be formed as a rotating part. The assembly takes place simply in that the sensor housing 11 is screwed into the front cover 9, wherein by sealing the seal 17 seals between the end cover 9 and the sensor housing 11.
  • the carrier element 13 is held by a snap ring 26 in the sensor housing 11.
  • the transmission element 19 protrudes through the end cover 9, so that the support element 13, which is already preassembled in the sensor housing 11, can be placed on the transmission element 19 before the sensor housing 11 is screwed into the end cover 9.
  • the sensor housing 11 has a groove 27 on its outer periphery.
  • a bracket 28 shown only schematically is clipped into the groove 27. This clamp 28 holds the receiver 15 on the front side of the sensor housing 11 fixed.
  • the receiver 15 can be easily assembled in this way, but also replaced.
  • Magnetoresistive sensor elements 30 may comprise Wheatstone bridges, which output a signal with which the angular position of the shaft 3 or that of the encoder 3 operatively connected to the shaft 3 can be measured.
  • two output signals 31 and 32 may be a sine or a cosine, as shown in FIG Fig. 5a is shown. With the help of these two output signals 31, 32, the angle can then be determined.
  • Fig. 5a Normalized output signals 31, 32 are shown as a function of the angle.
  • a sawtooth voltage 33 is often output.
  • the sawtooth voltage is shown as a function of time. At points of lowest voltage, the angles are 0 ° or 360 °. If the receiver 15 has a magnetoresistive or a Hall sensor element 30 and the transmitter 12 has a magnet 29, then one has the necessary elements for a Hall or rotation sensor 34. Of course, other types of rotation sensors 34 as a Hall sensor 34 conceivable. Also quite different types of sensors 34 are conceivable. In particular, the previously mentioned optical sensor 34, in which the encoder 12 is scanned by electromagnetic waves, represents a further possibility. In a tacho-generator sensor 34, a voltage proportional to the speed is supplied.
  • the output signals 31, 32 or the sawtooth voltage 33 can be used for further processing.
  • these signals are converted into a quadrilateral signal 35.
  • quadrilateral signal 35 represents a digital signal that can be recognized and used by a variety of consumers. Voltage losses in the connecting lines have no influence on signal quality. The slope of the edge typically varies between 5 microseconds and 50 milliseconds, and at least 90 pulses per cycle are typically used.
  • the output signals 31, 32 are cut into segments of a predetermined frequency, the frequency depending on the desired resolution.
  • an output element 36 ( Fig. 6 ) to a spend.
  • a memory 37 In order to obtain a direction of rotation of the shaft 3, you can see a memory 37, as in Fig. 6 is shown, use.
  • the memory 37 then stores at least two values of the angular position of the shaft 3 it can use the sinusoidal or cosinusoidal output signals 31, 32 or the sawtooth voltage 33. Taking into account the transition from 360 ° to 0 °, the direction of rotation is also displayed next to the speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

The machine i.e. hydraulic motor (1), has a housing (2), and a shaft guided in the housing. A sensor arrangement (10) has a transducer (12) that stays in effective connection with the shaft. The arrangement has a retaining area in which the transducer is arranged. The retaining area stays in fluid connection with an inner area of the housing, and sealed outwardly. A receiver (15) is arranged at an outer side of the housing and the retaining area. The transducer has a support element that works together with a sensor housing (11), where the sensor housing is screwed to a front cover (9).

Description

Die Erfindung betrifft eine Fluid-Rotationsmaschine mit einem Gehäuse, einer aus dem Gehäuse geführten Welle und eine Sensoranordnung, die einen Geber, der mit der Welle in Wirkverbindung steht, und einen Empfänger aufweist.The invention relates to a fluid rotary machine comprising a housing, a shaft guided out of the housing and a sensor arrangement which has an encoder, which is in operative connection with the shaft, and a receiver.

Eine derartige Maschine ist aus US 6 539 710 B2 bekannt. Der erste Abschnitt weist ein außen verzahntes Zahnrad auf, das mit einem innen verzahnten Zahnring zusammenwirkt. Zwischen dem Zahnrad und dem Zahnring sind Drucktaschen gebildet, die über eine rotierende Ventilschieberanordnung jeweils mit Druckfluid versorgt oder mit einem Niederdruckbereich verbunden werden. Das Zahnrad ist über eine Kardanwelle mit der Welle verbunden. Das Zahnrad steht mit einem Kurbelzapfen in Eingriff, der die orbitierende Bewegung des Zahnrades auf eine Sensorwelle überträgt.Such a machine is off US Pat. No. 6,539,710 B2 known. The first section has an externally toothed gear which cooperates with an internally toothed ring gear. Between the gear and the ring gear pressure pockets are formed, which are supplied via a rotating valve spool assembly each with pressurized fluid or connected to a low pressure region. The gear is connected via a cardan shaft with the shaft. The gear is engaged with a crankpin, which transmits the orbiting motion of the gear to a sensor shaft.

US 4 593 555 beschreibt einen hydraulischen Motor, bei dem man einen Drucksensor verwendet, um die Rotationsgeschwindigkeit der Welle zu ermitteln. US 4,593,555 describes a hydraulic motor in which one uses a pressure sensor to determine the rotational speed of the shaft.

US 6 062 123 beschreibt eine hilfskraftunterstützte Lenkeinrichtung mit einem Motor und einem Sensor, der eine Position einer Lenkhandradwelle abtastet. Der Sensor ist radial zur Achse der Lenkhandradwelle angeordnet. US Pat. No. 6,062,123 describes a power-assisted steering device with a motor and a sensor that scans a position of a steering handwheel shaft. The sensor is arranged radially to the axis of the steering wheel shaft.

DE 198 24 926 C2 beschreibt eine weitere hydraulische Lenkeinrichtung, bei der ein innerer Steuerschieber an seiner Stirnseite mit einer Zahnreihe versehen ist, die von einem Fühler abgetastet werden kann. DE 198 24 926 C2 describes a further hydraulic steering device, in which an inner spool is provided on its front side with a row of teeth that can be scanned by a sensor.

DE 10 2005 036 483 B4 beschreibt eine hydraulische Rotationsmaschine, deren Welle mit einem Geber versehen ist, der an seinem äußeren Umfang eine Zahnstruktur aus Zähnen und Nuten aufweist. Im Gehäuse ist ein Sender angeordnet, der einen Lichtstrahl auf die Gewindestruktur richtet. Von der Gewindestruktur wird der Lichtstrahl zu einem Empfänger reflektiert. DE 10 2005 036 483 B4 describes a hydraulic rotary machine whose shaft is provided with a donor having on its outer periphery a tooth structure of teeth and grooves. In the housing, a transmitter is arranged, which directs a light beam to the threaded structure. From the thread structure of the light beam is reflected to a receiver.

In vielen Anwendungsbereichen derartiger Maschinen, insbesondere bei hydraulischen Rotationsmaschinen, benötigt man Sensoren, um die Maschine mit ausreichender Genauigkeit steuern zu können, beispielsweise in Verbindung mit einem zugehörigen Dieselmotor, um Energie zu sparen.In many applications of such machines, especially in hydraulic rotary machines, one needs sensors to control the machine with sufficient accuracy can, for example in conjunction with an associated diesel engine to save energy.

Die eingangs erwähnten Sensoranordnungen in den Maschinen haben sich zwar prinzipiell bewährt. Sie erfordern aber vielfach einen verhältnismäßig komplizierten Einbau des Sensors. Der Sensor befindet sich dann oft an einer Position, wo er im Grunde stört. Wenn der Sensor an einer Position angeordnet wird, wo er weniger stört, besteht das Problem, dass er nicht die Drehung der Welle direkt ermitteln kann, sondern mit der Welle über mehrere spielbehaftete Eingriffsstellen in Verbindung steht. Eine ähnliche Problematik ergibt sich dann, wenn sich die Welle verwinden kann, beispielsweise bei großen Drehmomenten innerhalb des Bewegungsstranges.The sensor arrangements in the machines mentioned in the introduction have proven themselves in principle. But they often require a relatively complicated installation of the sensor. The sensor is then often in a position where it basically bothers. If the sensor is placed in a position where it interferes less, there is the problem that it can not directly detect the rotation of the shaft, but is in communication with the shaft through a plurality of play-engaged engagement points. A similar problem arises when the shaft can twist, for example, at high torques within the movement train.

Der Erfindung liegt die Aufgabe zugrunde, die Sensoranordnung vorteilhaft an der Fluid-Rotationsmaschine anzuordnen.The invention has the object of advantageously arranging the sensor arrangement on the fluid rotary machine.

Diese Aufgabe wird bei einer Fluid-Rotationsmaschine der eingangs genannten Art dadurch gelöst, dass die Sensoranordnung einen Aufnahmebereich aufweist, in dem der Geber angeordnet ist, wobei der Aufnahmebereich mit dem Inneren des Gehäuses in Fluidverbindung steht und nach außen abgedichtet ist und der Empfänger außerhalb des Gehäuses und des Aufnahmebereichs angeordnet ist.This object is achieved in a fluid rotary machine of the type mentioned above in that the sensor arrangement has a receiving area in which the encoder is arranged, wherein the receiving area is in fluid communication with the interior of the housing and is sealed to the outside and the receiver outside of Housing and the receiving area is arranged.

Man macht sich bei einer derartigen Ausbildung in vorteilhafter Weise zunutze, dass der Aufnahmebereich das Innere der Maschine nach außen abdichtet, so dass man bei der Sensoranordnung keine Öffnung benötigt, durch die ein sich bewegendes Element geführt wird und die dann abgedichtet werden muss. Wenn man eine Dichtung zwischen bewegten Teilen einsparen kann, erhöht dies die Betriebssicherheit. Der Verschleiß bleibt klein und die Fehleranfälligkeit sinkt. Wenn die Sensoranordnung beispielsweise mit einer hydraulischen Maschine gekoppelt ist, dann kann Hydraulikflüssigkeit in den Aufnahmebereich eindringen und schmiert dann gleichzeitig die Berührungsflächen des Gebers mit dem Gehäuse oder einem anderen Element. Dies wiederum führt dazu, dass sich der Geber praktisch frei drehen kann, so dass ein außerordentlich kleines Moment erforderlich ist, um den Geber zu drehen. Dies wiederum hält bei Verwendung eines Übertragungselements die Verwindung des Übertragungselements sehr klein. Eine besonders einfache Ausgestaltung ist es, den Aufnahmebereich innerhalb des Gehäuses anzuordnen. Der Aufnahmebereich kann als Aufnahmeraum ausgebildet sein.One makes use of such a configuration in an advantageous manner that the receiving area seals the interior of the machine to the outside, so that one in the sensor assembly requires no opening through which a moving element is guided and must then be sealed. If you can save a seal between moving parts, this increases the reliability. The wear remains small and the susceptibility to errors decreases. For example, if the sensor assembly is coupled to a hydraulic machine, hydraulic fluid may enter the receiving area and then simultaneously lubricate the contact surfaces of the transmitter with the housing or other element. This in turn means that the encoder can rotate virtually freely, so that an extremely small moment is required to turn the encoder. This in turn keeps the twist of the transmission element very small when using a transmission element. A particularly simple embodiment is to arrange the receiving area within the housing. The receiving area may be formed as a receiving space.

Vorzugsweise ist der Aufnahmebereich in einem Stirndeckel der Fluid-Rotationsmaschine ausgebildet. Ein solcher Aufbau ist besonders kompakt. Der Aufnahmebereich kann beispielsweise als Bohrung beziehungsweise als Einbuchtung im Stirndeckel ausgebildet sein. Man wird dabei keine durchgehende Bohrung vorsehen. Ansonsten wäre die Dichtigkeit nicht mehr gewährleistet. Auch hier benötigt man bei der Sensoranordnung keine Öffnung, durch die ein sich bewegendes Element geführt ist. Man kann den Stirndeckel oder auch andere Teile des Gehäuses aus rostfestem Stahl herstellen. Eine Wechselwirkung zwischen Geber und Empfänger wird, wenn die Wechselwirkung durch ein Magnetfeld bedingt ist, so nicht gestört.Preferably, the receiving area is formed in an end cap of the fluid rotary machine. Such a construction is particularly compact. The receiving area may be formed, for example, as a bore or as a recess in the front cover. There will be no through hole provided. Otherwise, the tightness would no longer be guaranteed. Again, you need in the sensor assembly no opening through which a moving element is performed. You can make the front cover or other parts of the housing made of stainless steel. A Interaction between donor and receiver is not disturbed when the interaction is due to a magnetic field.

Bevorzugterweise weist der Geber ein Trägerelement auf, das mit dem Stirndeckel reibungsarm zusammenwirkt. Man benötigt dann an sich im Aufnahmebereich keine Flüssigkeit oder ein Fluid, das eine schmierende Wirkung hat. Aufgrund des reibungsarmen Zusammenwirkens von Stirndeckel und Trägerelement ist die Sensoranordnung auch so verwendbar.Preferably, the encoder on a support member which cooperates with low friction with the end cover. One then does not need a liquid or a fluid in the receiving area which has a lubricating effect. Due to the low-friction interaction of the front cover and the carrier element, the sensor arrangement is also usable.

Vorzugsweise weist die Sensoranordnung ein Sensorgehäuse auf, in dem der Aufnahmebereich angeordnet ist. In dieser Ausgestaltung ist es das Sensorgehäuse, das das Innere der Maschine nach außen abdichtet. Auch in diesem Fall wird bei der Sensoranordnung keine Öffnung für ein sich bewegendes Element benötigt, das abgedichtet werden müsste. Das Sensorgehäuse kann als separates Bauteil hergestellt werden. Dies vereinfacht zum einen die Herstellung. Zum anderen kann das Sensorgehäuse so besonders gut an die Bedürfnisse der Sensoranordnung, insbesondere an die des Gebers, adaptiert werden.Preferably, the sensor arrangement has a sensor housing in which the receiving area is arranged. In this embodiment, it is the sensor housing that seals the interior of the machine to the outside. Also in this case, no opening for a moving element is required in the sensor assembly, which would have to be sealed. The sensor housing can be manufactured as a separate component. This simplifies the production on the one hand. On the other hand, the sensor housing can be particularly well adapted to the needs of the sensor arrangement, in particular to that of the encoder.

Bevorzugterweise weist der Geber ein Trägerelement auf, das mit dem Sensorgehäuse reibungsarm zusammenwirkt. In diesem Fall kann man die Sensoranordnung auch dann verwenden, wenn eine Flüssigkeit oder ein Fluid, das in den Aufnahmebereich eindringt, an sich keine schmierende Wirkung hat, wie dies beispielsweise bei wasserhydraulischen Maschinen der Fall ist.Preferably, the encoder has a carrier element which cooperates with low friction with the sensor housing. In this case, one can use the sensor arrangement even if a liquid or a fluid which penetrates into the receiving area does not have a lubricating effect per se, as is the case, for example, with water-hydraulic machines.

Vorzugsweise ist das Sensorgehäuse in einen Stirndeckel der Fluid-Rotationsmaschine eingeschraubt. Das Sensorgehäuse weist zu diesem Zweck beispielsweise ein Außengewinde auf, das mit einem entsprechenden Innengewinde im Stirndeckel in Eingriff steht. Dies vereinfacht die Herstellung des Sensorgehäuses und die Montage der Sensoranordnung an der Maschine. Darüber hinaus ist es bei dieser Ausgestaltung relativ einfach, den Aufnahmebereich nach außen abzudichten. Man muss lediglich eine Dichtung zwischen dem Sensorgehäuse und dem Stirndeckel anordnen und das Sensorgehäuse mit ausreichender Kraft in den Stirndeckel einschrauben.Preferably, the sensor housing is screwed into a front cover of the fluid rotary machine. The sensor housing has for this purpose, for example, an external thread, which is in engagement with a corresponding internal thread in the end cap. This simplifies the manufacture of the sensor housing and the mounting of the sensor arrangement on the machine. Moreover, in this embodiment, it is relatively easy to seal the receiving area to the outside. You just have to arrange a seal between the sensor housing and the front cover and screw the sensor housing with sufficient force in the front cover.

Vorzugsweise ist der Empfänger auf das Sensorgehäuse aufgeclipst. Man verbindet also den Empfänger mit dem Sensorgehäuse mit einer lösbaren Verbindung, die relativ schnell hergestellt und wieder gelöst werden kann. Dies hat den Vorteil, dass man die Fluid-Rotationsmaschine durch Auswechseln des Empfängers relativ einfach mit unterschiedlichen Arten von Sensoranordnungen versehen kann. Auch wird eine Reparatur vereinfacht. Bei einer Sensoranordnung ist in der Regel der Empfänger das fehleranfälligste Teil.Preferably, the receiver is clipped onto the sensor housing. So you connect the receiver to the sensor housing with a detachable connection that can be made relatively quickly and released again. This has the advantage that the fluid rotary machine can be relatively easily provided with different types of sensor arrangements by replacing the receiver. Also, a repair is simplified. In a sensor arrangement, the receiver is usually the most error-prone part.

Bevorzugterweise weist der Geber einen Magnet auf. Der Magnet erzeugt das Magnetfeld, das auch noch am Empfänger messbar ist. Das Magnetfeld muss dabei nur wenige Millitesla betragen. Wird der Magnet aufgrund einer durch die Welle hervorgerufenen Bewegung des Gebers selbst bewegt, so bewirkt dies eine Änderung des Magnetfelds am Ort des Empfängers. Dabei ist es auch möglich, dass mehrere Magnete am Geber angeordnet sind. Aufgrund des variierenden Magnetfeldes kann der Empfänger dann Rückschlüsse auf die Bewegung des Gebers und damit der Welle ziehen. Weist der Geber einen Magnet auf, so wird man das Sensorgehäuse idealerweise aus einem Material bilden, das unmagnetisch ist, so dass das Magnetfeld am Empfänger ungestört anliegt.Preferably, the encoder has a magnet. The magnet generates the magnetic field, which is also measurable at the receiver. The magnetic field has to be only a few millitesla. If the magnet is moved due to a movement of the encoder caused by the shaft itself, this causes a change in the magnetic field at the recipient's place. It is also possible that several magnets are arranged on the encoder. Due to the varying magnetic field, the receiver can then draw conclusions about the movement of the encoder and thus the shaft. If the transmitter has a magnet, ideally the sensor housing will be made of a material that is non-magnetic, so that the magnetic field at the receiver is undisturbed.

Vorzugsweise weist der Empfänger ein magnetoresistives oder ein Hall-Sensorelement auf. Ein magnetoresistives Element ändert seinen elektrischen Widerstand, wenn ein äußeres Magnetfeld angebracht wird. Dieser kann dann ausgelesen werden. Ein Hall-Sensorelement liefert, wenn es von einem Strom durchflossen wird, eine Ausgangsspannung, die einer senkrechten Komponente des Magnetfeldes und dem Strom proportional ist. Das heißt, auch bei einem nicht bewegten Magnet kann anders als bei einer Spulen-Magnetanordnung immer ein Strom ausgelesen werden.Preferably, the receiver has a magnetoresistive or a Hall sensor element. A magnetoresistive element changes its electrical resistance when an external magnetic field is applied. This can then be read out. A Hall sensor element, when current flows through it, provides an output voltage that is proportional to a vertical component of the magnetic field and the current. That is, even with a non-moving magnet, unlike a coil magnet arrangement, a current can always be read out.

Vorzugsweise sind Geber und Empfänger Elemente eines Hall-, Rotations-, Tacho-Generator- oder Optik-Sensors. Mit all diesen Sensoren kann die rotierende Bewegung der Welle, die mit dem Geber in Wirkverbindung steht, erfasst werden. Im Fall des Hall-Sensors weist der Geber einen Magnet und der Empfänger einen Hall-Sensor auf. Der Tacho-Generator liefert eine zur Drehzahl proportionale Spannung. Eine LED kann im Falle des Optik-Sensors durch ein transparentes Sensorgehäuse hindurch den Geber abtasten.Preferably, the transmitter and receiver elements of a Hall, rotation, speedometer generator or optical sensor. With all these sensors, the rotating movement of the shaft, which is in operative connection with the encoder, can be detected. In the case of the Hall sensor, the transmitter has a magnet and the receiver has a Hall sensor. The speedometer generator supplies a voltage proportional to the speed. In the case of the optical sensor, an LED can scan the sensor through a transparent sensor housing.

Bevorzugterweise weist die Sensoranordnung ein Ausgabeelement zum Ausgeben eines Vierecksignals auf. Das Ausgabeelement kann aber auch ein analoges Stromsignal ausgeben, das insbesondere zwischen 2 Milliampere und 20 Milliampere variiert. Alternativ kann ein analoges Spannungssignal ausgegeben werden, das typischerweise zwischen 0,1 Volt und 0,9 Volt variiert. Ein Vierecksignal hat aber den Vorteil, dass es weniger rauschempfindlich ist. Beispielsweise kann man als Vierecksignal ein TTL-Signal wählen.The sensor arrangement preferably has an output element for outputting a quadrilateral signal. However, the output element can also output an analog current signal, which varies in particular between 2 milliamps and 20 milliamps. Alternatively, an analog voltage signal may be output that typically varies between 0.1 volts and 0.9 volts. A quadrilateral signal has the advantage that it is less sensitive to noise. For example, one can select a quadrature signal as a TTL signal.

Vorzugsweise weist die Sensoranordnung einen Speicher auf, in dem zumindest zwei Werte speicherbar sind. Das Speichern von zwei Werten im Speicher kann insbesondere dazu benutzt werden, eine Drehrichtung der Welle zu ermitteln. Man kann beispielsweise zwei zu verschiedenen Zeiten gespeicherte Werte erst normalisieren und dann aus diesen unter Berücksichtigung des Übergangs von 360° zu 0° eine Drehgeschwindigkeit berechnen.Preferably, the sensor arrangement has a memory in which at least two values can be stored. The storage of two values in the memory can be used in particular to determine a direction of rotation of the shaft. For example, one can first normalize two values stored at different times, and then calculate a rotational speed from them taking into account the transition from 360 ° to 0 °.

Die Erfindung wird im Folgenden anhand von bevorzugten Ausführungsbeispielen in Verbindung mit der Zeichnung beschrieben. Hierin zeigen:

Fig. 1
einen hydraulischen Motor als Beispiel für eine Fluid-Rotationsmaschine,
Fig. 2
eine zweite Ausführungsform eines hydraulischen Motors,
Fig. 3
eine dritte Ausführungsform eines hydraulischen Motors,
Fig. 4
eine vierte Ausführungsform eines hydraulischen Motors,
Fig. 5
Darstellungen eines Ausgabesignals einer Sensoranordnung und
Fig. 6
eine schematische Darstellung der Fluid-Rotationsmaschine mit einem Ausgabeelement und einem Speicher.
The invention will be described below with reference to preferred embodiments in conjunction with the drawing. Herein show:
Fig. 1
a hydraulic motor as an example of a fluid rotary machine,
Fig. 2
a second embodiment of a hydraulic motor,
Fig. 3
a third embodiment of a hydraulic motor,
Fig. 4
a fourth embodiment of a hydraulic motor,
Fig. 5
Representations of an output signal of a sensor arrangement and
Fig. 6
a schematic representation of the fluid rotary machine with an output element and a memory.

Die Erfindung wird im Folgenden anhand eines hydraulischen Motors als Beispiel für eine Fluid-Rotationsmaschine erläutert. Sie ist jedoch nicht auf hydraulische Motoren beschränkt.The invention will be explained below with reference to a hydraulic motor as an example of a fluid rotary machine. However, it is not limited to hydraulic motors.

Ein in Fig. 1 dargestellter hydraulischer Motor 1 weist ein Gehäuse 2 auf, aus dem eine Welle 3 herausgeführt ist. An der Welle 3 kann eine mechanische Leistung abgenommen werden.An in Fig. 1 illustrated hydraulic motor 1 has a housing 2, from which a shaft 3 is led out. On the shaft 3, a mechanical power can be removed.

Die Welle 3 ist um eine Achse 4 drehbar. Sie bildet den Teil eines Bewegungsstranges, der neben der Welle 3 eine Kardanwelle 5 und ein außen verzahntes Zahnrad 6 aufweist, das in einem innen verzahnten Zahnring 7 angeordnet ist und mit dem Zahnring 7 in an sich bekannter Weise Drucktaschen bildet, die in Abhängigkeit von ihrer Position mit Hydraulikflüssigkeit unter Druck versorgt werden oder Hydraulikflüssigkeit zu einem Niederdruckanschluss entlassen können. Zur Steuerung der Flüssigkeitsversorgung dieser Drucktaschen ist ein schematisch dargestellter Steuerschieber 8 vorgesehen, der mit der Welle 3 verbunden ist.The shaft 3 is rotatable about an axis 4. It forms the part of a movement train, which in addition to the shaft 3 has a propeller shaft 5 and an externally toothed gear 6, which is arranged in an internally toothed toothed ring 7 and forms with the toothed ring 7 in a conventional manner pressure pockets which, depending on their Position are supplied with hydraulic fluid under pressure or hydraulic fluid to a low pressure port can dismiss. To control the liquid supply of these pressure pockets, a schematically illustrated spool 8 is provided, which is connected to the shaft 3.

Der Bewegungsstrang weist also mit dem Zahnrad 6 einen ersten Abschnitt auf, der um die Achse 4 orbitiert. Ferner weist der Bewegungsstrang im Bereich der Welle 3 einen zweiten Abschnitt auf, der um die Achse 4 rotiert.The motion strand thus has, with the gear 6, a first section which orbits around the axis 4. Furthermore, the movement strand in the region of the shaft 3 has a second section which rotates about the axis 4.

Das Gehäuse 2 ist an der der Welle gegenüberliegenden Seite durch einen Stirndeckel 9 verschlossen. Außen am Stirndeckel 9 ist eine Sensoranordnung 10 angeordnet. Die Sensoranordnung 10 kann aber auch zumindest teilweise im Gehäuse 2 oder im Stirndeckel 9 angeordnet sein. Mit der Sensoranordnung 10 soll die Drehung der Welle 3 möglichst genau erfasst werden können.The housing 2 is closed on the opposite side of the shaft by a front cover 9. Outside on the front cover 9, a sensor arrangement 10 is arranged. However, the sensor arrangement 10 can also be arranged at least partially in the housing 2 or in the front cover 9. With the sensor assembly 10, the rotation of the shaft 3 should be detected as accurately as possible.

Die Sensoranordnung 10 kann ein Sensorgehäuse 11 aufweisen, das einen Aufnahmebereich umgibt, in dem ein Geber 12 angeordnet ist. Der Aufnahmebereich kann als Aufnahmeraum ausgebildet sein. Der Geber 12 weist ein Trägerelement 13 auf, das aus einem Material gebildet ist, das mit dem Material des Sensorgehäuses 11 reibungsarm zusammenwirkt. Auf dem Trägerelement ist ein oder sind mehrere Geberelemente angeordnet. Im vorliegenden Ausführungsbeispiel sind die Geberelemente 14 als Magnete 29 bzw. als Permanentmagnete ausgebildet. Auf der Außenseite des Sensorgehäuses 11 ist ein Empfänger 15 angeordnet, der durch das Magnetfeld der Geberelemente 14 beaufschlagt wird und über eine nicht näher dargestellte Leitung oder leitungslos elektrische Signale, die die Information über die Drehbewegung der Welle 3 enthalten, und eine nicht näher dargestellte Steuerung weitergeben.The sensor arrangement 10 can have a sensor housing 11 which surrounds a receiving area in which an encoder 12 is arranged. The receiving area may be formed as a receiving space. The encoder 12 has a support member 13 which is formed of a material which cooperates with low friction with the material of the sensor housing 11. On the carrier element one or more donor elements are arranged. In the present embodiment, the encoder elements 14 are formed as magnets 29 and as permanent magnets. On the outside of the sensor housing 11, a receiver 15 is arranged, which by the magnetic field of the donor elements 14 is applied and passed on a non-illustrated line or wireless electrical signals containing the information about the rotational movement of the shaft 3, and a controller, not shown.

Der Stirndeckel 9 weist zentrisch eine Durchgangsöffnung 16 auf. Über die Durchgangsöffnung 16 steht das Innere des Gehäuses 2 mit dem Aufnahmebereich des Sensorgehäuses 11 in Verbindung, so dass Hydraulikflüssigkeit aus dem Inneren des Gehäuses 2 auch in das Innere des Sensorgehäuses 11 vordringen kann. Zwischen dem Sensorgehäuse 11 und dem Stirndeckel 9 ist eine Dichtung 17 angeordnet, so dass die Hydraulikflüssigkeit nicht nach außen gelangen kann. Die notwendigen Dichtungskräfte werden durch eine Befestigungsanordnung gewährleistet, mit der das Sensorgehäuse 11 am Stirndeckel 9 befestigt ist. Diese Befestigungsanordnung ist hier durch eine Schraube 18 symbolisiert. Tatsächlich werden mehrere Schrauben 18 vorgesehen sein.The front cover 9 has centrally a through opening 16. Via the passage opening 16, the interior of the housing 2 is in communication with the receiving area of the sensor housing 11, so that hydraulic fluid can also penetrate from the interior of the housing 2 into the interior of the sensor housing 11. Between the sensor housing 11 and the end cover 9, a seal 17 is arranged so that the hydraulic fluid can not escape to the outside. The necessary sealing forces are ensured by a mounting arrangement with which the sensor housing 11 is attached to the front cover 9. This fastening arrangement is symbolized here by a screw 18. In fact, a plurality of screws 18 will be provided.

Das Sensorgehäuse 11 ist aus einem Material gebildet, das unmagnetisch ist und das das Magnetfeld von den Geberelementen 14 hindurchtreten lässt, so dass dieses Magnetfeld vom Empfänger 15 erfasst werden kann.The sensor housing 11 is formed of a material that is non-magnetic and that allows the magnetic field from the donor elements 14 pass, so that this magnetic field can be detected by the receiver 15.

Statt ein Sensorgehäuse 11 zu verwenden, kann man den Aufnahmebereich auch im Stirndeckel 9 anordnen. Es ist auch möglich, den Aufnahmebereich an einer anderen Stelle im Gehäuse anzuordnen. Will man den Aufnahmebereich im Stirndeckel 9 anordnen, so wird man statt der Durchgangsöffnung 16 eine nicht durchgehende Bohrung oder eine Einbuchtung vorsehen. Auf diese Weise ist die Dichtigkeit auch ohne Sensorgehäuse 11 gewährleistet. Auch in diesem Fall kann der Geber 12 ein Trägerelement 13 aufweisen. Vorteilhaft ist es, wenn das Trägerelement 13 mit dem Stirndeckel 9 reibungsarm zusammenwirkt. Wenn im Folgenden oder im vorherigen der Geber 12 im Sensorgehäuse 11 beschrieben ist, so ist es alternativ immer möglich, dass der Geber 12 generell im Aufnahmebereich und insbesondere im Gehäuse 2 oder im Stirndeckel 9 angeordnet ist.Instead of using a sensor housing 11, one can also arrange the receiving area in the front cover 9. It is also possible to arrange the receiving area at a different location in the housing. If you want to arrange the receiving area in the front cover 9, so you will instead of Through hole 16 provide a non-continuous bore or indentation. In this way, the tightness is ensured even without sensor housing 11. Also in this case, the encoder 12 may have a carrier element 13. It is advantageous if the support element 13 cooperates with low friction with the end cover 9. If the encoder 12 in the sensor housing 11 is described below or in the preceding, it is alternatively always possible for the encoder 12 to be arranged generally in the receiving area and in particular in the housing 2 or in the front cover 9.

Das Trägerelement 13 ist über ein Übertragungselement 19 mit einem zweiten Abschnitt des Bewegungsstranges verbunden, der um die Achse 4 rotiert. Dies ist das Ende der Kardanwelle 5, das mit der Welle 3 über eine Verzahnungsgeomtrie 20 in Eingriff steht.The carrier element 13 is connected via a transmission element 19 to a second section of the movement strand, which rotates about the axis 4. This is the end of the propeller shaft 5, which is engaged with the shaft 3 via a Verzahnungsgeomtrie 20.

Das Übertragungselement 19 ist als Tachometerwelle ausgebildet, d.h. es ist verwindungssteif. Zum Antrieb des Gebers 12, der im Aufnahmebereich bzw. im Sensorgehäuse 11 durch die Hydraulikflüssigkeit zusätzlich geschmiert ist, ist praktisch kein Drehmoment erforderlich, so dass das Übertragungselement 19 praktisch nicht auf Torsion beansprucht wird. Der Geber 12 hat also mit einer hohen Genauigkeit immer genau die gleiche Drehwinkellage wie die Welle 3. Die Abweichung beträgt maximal 5°, vorzugsweise sogar nur maximal 2° und in besonders bevorzugten Fällen maximal 1°.The transmission element 19 is designed as a tachometer shaft, ie it is torsionally rigid. To drive the encoder 12, which is additionally lubricated in the receiving area or in the sensor housing 11 by the hydraulic fluid, virtually no torque is required, so that the transmission element 19 is practically not claimed to torsion. The encoder 12 thus always has exactly the same angular position as the shaft 3 with a high degree of accuracy. The deviation amounts to a maximum of 5 °, preferably even to a maximum of 2 ° and in particularly preferred cases to a maximum of 1 °.

Damit das Übertragungselement 19 zum Geber 12 geführt werden kann, weist die Kardanwelle einen Längskanal 21 auf, der auch den ersten Abschnitt des Bewegungsstranges durchsetzt. Das Zahnrad 6 dreht sich mit der gleichen Geschwindigkeit wie die Kardanwelle 5 und damit mit der gleichen Geschwindigkeit wie das Übertragungselement 19. Es entsteht also im Längskanal 21 in Rotationsrichtung keine Relativbewegung zwischen dem Übertragungselement 19 und der Kardanwelle 5. Wenn der Längskanal 21 einen zu geringen Durchmesser aufweist, um dem Übertragungselement 19 über eine volle Umdrehung den notwendigen Freiraum zu lassen, dann erfolgt allenfalls eine Biegebewegung des Übertragungselements 19, die aber unkritisch ist.So that the transmission element 19 can be guided to the encoder 12, the cardan shaft has a longitudinal channel 21, which also passes through the first section of the movement strand. The gear 6 rotates at the same speed as the cardan shaft 5 and thus at the same speed as the transmission element 19. Thus, there is no relative movement between the transmission element 19 and the cardan shaft 5 in the longitudinal channel 21 in the direction of rotation Has diameter to allow the transmission element 19 over a full revolution the necessary space, then at most a bending movement of the transmission element 19, which is not critical.

Anstelle einer Tachometerwelle kann man auch ein anderes Übertragungselement verwenden, beispielsweise einen dünnen Metallstab oder dergleichen.Instead of a tachometer shaft, one can also use another transmission element, for example a thin metal rod or the like.

Bei der Ausgestaltung nach Fig. 1 ergibt sich unter Umständen eine Abweichung zwischen der Winkelposition der Welle 3 und der Winkelposition des Gebers 12 aufgrund eines Spiels in der Verzahnungsgeometrie 20.In the embodiment according to Fig. 1 Under certain circumstances, a deviation between the angular position of the shaft 3 and the angular position of the encoder 12 due to a game in the tooth geometry 20 results.

Um diese Abweichung zu beseitigen, kann man eine Ausgestaltung verwenden, wie sie in Fig. 2 dargestellt ist. Hier sind gleiche Elemente mit den gleichen Bezugszeichen versehen.In order to eliminate this deviation, one can use an embodiment as shown in FIG Fig. 2 is shown. Here, the same elements are provided with the same reference numerals.

Das Übertragungselement 19 ist hier länger ausgebildet als bei der Ausgestaltung nach Fig. 1, so dass es unmittelbar in der Welle 3 befestigt werden kann. Ein mögliches Spiel in der Verzahnungsgeometrie 20 spielt dann keine Rolle mehr.The transmission element 19 is formed here longer than in the embodiment according to Fig. 1 so it's immediate can be fixed in the shaft 3. A possible play in the gearing geometry 20 then no longer plays a role.

In beiden Fällen ist das Übertragungselement 19 mit dem Geber 12 und/oder mit der Welle 3 drehfest verbunden, aber in eine Richtung parallel zur Achse 4 verschiebbar verbunden. Dies lässt sich beispielsweise dadurch erreichen, dass die Enden des Übertragungselements 19 einen polygonartigen Querschnitt haben, beispielsweise in Form eines Quadrats. Diese Enden des Übertragungselements 19 sind dann in entsprechende Ausnehmungen im Geber 12 und/oder in der Welle 3 geführt, die einen entsprechenden polygonartigen Querschnitt haben. Damit lässt sich das Ende in gewissem Umfang in den jeweiligen Ausnehmungen axial verschieben, so dass eine Längenänderung des Übertragungselements 19 aufgenommen werden kann, wie sie sich beispielsweise bei einer Temperaturänderung ergeben kann.In both cases, the transmission element 19 is rotatably connected to the encoder 12 and / or with the shaft 3, but slidably connected in a direction parallel to the axis 4. This can for example be achieved in that the ends of the transmission element 19 have a polygonal cross-section, for example in the form of a square. These ends of the transmission element 19 are then guided into corresponding recesses in the transmitter 12 and / or in the shaft 3, which have a corresponding polygonal cross-section. This allows the end to be displaced axially to a certain extent in the respective recesses, so that a change in length of the transmission element 19 can be accommodated, as may arise, for example, in the event of a temperature change.

Fig. 3 zeigt eine weitere hydraulische Maschine. Gleiche Elemente wie in den Fig. 1 und 2 sind mit den gleichen Bezugszeichen versehen. Fig. 3 shows another hydraulic machine. Same elements as in the Fig. 1 and 2 are provided with the same reference numerals.

Auch hier ist die Welle 3 über eine Verzahnungsgeometrie 20 mit der Kardanwelle 5 verbunden, die ihrerseits wiederum über eine zweite Verzahnungsgeometrie 22 mit dem Zahnrad 6 verbunden ist. Eine zweite Kardanwelle 23 ist vorgesehen, um das Zahnrad 6 mit dem Ventilschieber 8 zu verbinden, der gemeinsam mit der Welle 3 rotiert, um den zwischen dem Zahnrad 6 und dem Zahnring 7 ausgebildeten Drucktaschen die Hydraulikflüssigkeit positionsrichtig zuzuführen.Again, the shaft 3 is connected via a tooth geometry 20 with the propeller shaft 5, which in turn is connected via a second tooth geometry 22 with the gear 6. A second propeller shaft 23 is provided to connect the gear 6 with the valve spool 8, which rotates together with the shaft 3 to the formed between the gear 6 and the toothed ring 7 Pressure pockets to supply the hydraulic fluid position correct.

Das Übertragungselement 19 ist an einem Ende mit der Welle 3 verbunden und am anderen Ende mit dem Geber 12. Dementsprechend hat der Geber 12 mit hoher Genauigkeit die gleiche winkelmäßige Position wie die Welle 3. Spiel in den Verzahnungsgeometrien 20, 22 ist hier ohne Einfluss.The transmission element 19 is connected at one end to the shaft 3 and at the other end to the encoder 12. Accordingly, the encoder 12 with high accuracy the same angular position as the shaft 3. Game in the toothing geometries 20, 22 is without influence.

Fig. 3b zeigt in vergrößerter Darstellung eine Einzelheit B aus Fig. 3a, d.h. die Sensoranordnung 10. Fig. 3b zeigt einen Schnitt C-C nach Fig. 3c. Daraus ist ersichtlich, dass das Übertragungselement 19 an seinem Ende, das im Trägerelement 13 aufgenommen ist, einen quadratischen Querschnitt hat und das Trägerelement 13 eine entsprechende Aufnahme aufweist. Fig. 3b shows an enlarged view of a detail B from Fig. 3a ie the sensor arrangement 10. Fig. 3b shows a section CC after Fig. 3c , It can be seen that the transmission element 19 has at its end, which is received in the support member 13, a square cross-section and the support member 13 has a corresponding receptacle.

Das Sensorgehäuse 11 ist beispielsweise aus Edelstahl gebildet und das Trägerelement 13 aus einem Kunststoff, vorzugsweise PEEK (Polyetheretherketone).The sensor housing 11 is formed, for example, of stainless steel and the support member 13 made of a plastic, preferably PEEK (polyetheretherketones).

Anstelle von Magneten 29 als Geberelemente 14 lassen sich natürlich auch andere Geberelemente verwenden.Instead of magnets 29 as donor elements 14, of course, other donor elements can be used.

Wenn beispielsweise das Sensorgehäuse 11, das Gehäuse 2 oder der Stirndeckel 9 für eine Strahlung, beispielsweise eine optische Strahlung, durchlässig ist, dann kann das Geberelement 14 auch eine optische Markierung aufweisen, die von außen durch das Sensorgehäuse 11, das Gehäuse 2 oder den Stirndeckel 9 hindurch abgetastet werden kann. Bei der Strahlung muss es sich nicht unbedingt um eine sichtbare Strahlung handeln. Möglich ist auch die Verwendung von Strahlung im infraroten oder ultravioletten Bereich. Auch andere elektromagnetische Wellen können, sofern sie das Sensorgehäuse 11, das Gehäuse 2 oder den Stirndeckel 9 durchdringen können, für die Signalübertragung vom Geber 12 nach außen verwendet werden.If, for example, the sensor housing 11, the housing 2 or the end cover 9 is permeable to radiation, for example optical radiation, then the transmitter element 14 may also have an optical marking which is externally provided by the sensor housing 11, the housing 2 or the end cover 9 scanned through can be. The radiation does not necessarily have to be visible radiation. It is also possible to use radiation in the infrared or ultraviolet range. Other electromagnetic waves can, if they can penetrate the sensor housing 11, the housing 2 or the front cover 9, are used for the signal transmission from the transmitter 12 to the outside.

Das Sensorgehäuse 11 ist über die Dichtung 17 gegenüber dem Stirndeckel 9 abgedichtet. Dementsprechend kann Hydraulikflüssigkeit zwar in das Innere des Sensorgehäuses 11 vordringen, nicht jedoch nach außen. Das Sensorgehäuse 11 ist so ausgelegt, dass es die im Inneren des Gehäuses 2 auftretenden Drücke aufnehmen kann. Man benötigt allerdings keine Dichtungen, um im Bereich der Sensoranordnung 10 bewegte Teile gegeneinander abzudichten.The sensor housing 11 is sealed by the seal 17 with respect to the end cover 9. Accordingly, although hydraulic fluid can penetrate into the interior of the sensor housing 11, but not to the outside. The sensor housing 11 is designed so that it can absorb the pressures occurring in the interior of the housing 2. However, no seals are required in order to seal off moving parts in the area of the sensor arrangement 10.

Fig. 4a zeigt eine Ausgestaltung ähnlich zu der Ausgestaltung nach Fig. 3a. Gleiche Elemente sind mit den gleichen Bezugszeichen versehen. Fig. 4a shows an embodiment similar to the embodiment according to Fig. 3a , The same elements are provided with the same reference numerals.

Im Wesentlichen ergeben sich zwei Änderungen:In essence, there are two changes:

Zum einen ist das Übertragungselement 19 mit der Kardanwelle 5 verbunden und zwar an dem Ende, das von der Welle 3 abgewandt ist. Damit ist das Übertragungselement 19 zwar in diesem Bereich exzentrisch angeordnet. Man macht sich aber die Erkenntnis zunutze, dass die Kardanwelle 5 mit der gleichen Geschwindigkeit wie die Welle 3 rotiert und es somit im Grunde unerheblich ist, ob man das Übertragungselement 19 an einem rotierenden und orbitierenden Abschnitt der Kardanwelle 5 befestigt oder, wie in Fig. 1, an einem nur rotierenden Abschnitt der Kardanwelle 5. Die einzige Voraussetzung ist, dass das Übertragungselement 19 nur in einem Umfang auf Biegung beansprucht wird, den es im Betrieb auf Dauer auch aushalten kann.On the one hand, the transmission element 19 is connected to the propeller shaft 5 and indeed at the end which faces away from the shaft 3. Thus, the transmission element 19 is indeed arranged eccentrically in this area. However, one makes use of the knowledge that the propeller shaft 5 at the same speed as the Shaft 3 rotates and thus it is basically irrelevant whether the transmission element 19 is attached to a rotating and orbiting portion of the propeller shaft 5 or, as in Fig. 1 , The only requirement is that the transmission element 19 is subjected to bending only to an extent that it can withstand during operation in the long term.

Ein zweiter Unterschied betrifft die Sensoranordnung 10, die in Fig. 4b vergrößert dargestellt ist.A second difference relates to the sensor arrangement 10, which in Fig. 4b is shown enlarged.

Das Sensorgehäuse 11 weist ein Außengewinde 24 auf, das in ein Innengewinde 25 in der Durchgangsöffnung 16 im Stirndeckel 9 eingeschraubt ist. Dadurch wird sowohl die Herstellung des Sensorgehäuses 11 als auch die Montage des Sensorgehäuses 11 vereinfacht. Das Sensorgehäuse 11 kann als Drehteil ausgebildet werden. Die Montage erfolgt einfach dadurch, dass das Sensorgehäuse 11 in den Stirndeckel 9 eingeschraubt wird, wobei durch das Einschrauben die Dichtung 17 zwischen dem Stirndeckel 9 und dem Sensorgehäuse 11 abdichtet.The sensor housing 11 has an external thread 24 which is screwed into an internal thread 25 in the passage opening 16 in the front cover 9. As a result, both the production of the sensor housing 11 and the mounting of the sensor housing 11 is simplified. The sensor housing 11 may be formed as a rotating part. The assembly takes place simply in that the sensor housing 11 is screwed into the front cover 9, wherein by sealing the seal 17 seals between the end cover 9 and the sensor housing 11.

Das Trägerelement 13 ist durch einen Sprengring 26 im Sensorgehäuse 11 gehalten. Das Übertragungselement 19 ragt durch den Stirndeckel 9 hindurch, so dass das im Sensorgehäuse 11 bereits vormontierte Trägerelement 13 auf das Übertragungselement 19 aufgesetzt werden kann, bevor das Sensorgehäuse 11 in den Stirndeckel 9 eingeschraubt wird.The carrier element 13 is held by a snap ring 26 in the sensor housing 11. The transmission element 19 protrudes through the end cover 9, so that the support element 13, which is already preassembled in the sensor housing 11, can be placed on the transmission element 19 before the sensor housing 11 is screwed into the end cover 9.

Das Sensorgehäuse 11 weist eine Nut 27 an seinem Außenumfang auf. Eine nur schematisch dargestellte Klammer 28 ist in die Nut 27 eingeclipst. Diese Klammer 28 hält den Empfänger 15 an der Stirnseite des Sensorgehäuses 11 fest. Der Empfänger 15 kann auf diese Weise leicht montiert, aber auch ausgetauscht werden.The sensor housing 11 has a groove 27 on its outer periphery. A bracket 28 shown only schematically is clipped into the groove 27. This clamp 28 holds the receiver 15 on the front side of the sensor housing 11 fixed. The receiver 15 can be easily assembled in this way, but also replaced.

Man kann als Empfänger 15 ein magnetoresistives oder ein Hall-Sensorelement 30 verwenden. Dies bietet sich insbesondere dann an, wenn der Geber 12 ein Magnet 29 ist. Magnetoresistive Sensorelemente 30 können Wheatstone-Brücken aufweisen, die ein Signal ausgeben, mit dem die Winkelposition der Welle 3 beziehungsweise die des mit der Welle 3 in Wirkverbindung stehenden Gebers 12 gemessen werden kann. Insbesondere können zwei Ausgangssignale 31 und 32 ein Sinus bzw. ein Kosinus sein, wie es in Fig. 5a dargestellt ist. Mit Hilfe dieser beiden Ausgangssignale 31, 32 kann dann der Winkel bestimmt werden. In Fig. 5a sind normalisierte Ausgangssignale 31, 32 als Funktion des Winkels dargestellt. Im Falle des Hall-Sensorelements 30 wird oftmals eine Sägezahnspannung 33 ausgegeben. In Fig. 5b ist die Sägezahnspannung als Funktion der Zeit dargestellt. An Punkten geringster Spannung befinden sich die Winkel 0° bzw. 360°. Wenn der Empfänger 15 ein magnetoresistives oder ein Hall-Sensorelement 30 aufweist und der Geber 12 einen Magnet 29 aufweist, dann hat man die notwendigen Elemente für einen Hall- bzw. Rotations-Sensor 34. Natürlich sind auch andere Typen von Rotations-Sensoren 34 als ein Hall-Sensor 34 denkbar. Auch ganz andere Arten von Sensoren 34 sind denkbar. Insbesondere stellt der zuvor schon erwähnte Optik-Sensor 34, bei dem der Geber 12 durch elektromagnetische Wellen abgetastet wird, eine weitere Möglichkeit dar. Bei einem Tacho-Generator-Sensor 34 wird eine zur Drehzahl proportionale Spannung geliefert.It is possible to use a magnetoresistive or a Hall sensor element 30 as the receiver 15. This is particularly useful when the encoder 12 is a magnet 29. Magnetoresistive sensor elements 30 may comprise Wheatstone bridges, which output a signal with which the angular position of the shaft 3 or that of the encoder 3 operatively connected to the shaft 3 can be measured. In particular, two output signals 31 and 32 may be a sine or a cosine, as shown in FIG Fig. 5a is shown. With the help of these two output signals 31, 32, the angle can then be determined. In Fig. 5a Normalized output signals 31, 32 are shown as a function of the angle. In the case of the Hall sensor element 30, a sawtooth voltage 33 is often output. In Fig. 5b the sawtooth voltage is shown as a function of time. At points of lowest voltage, the angles are 0 ° or 360 °. If the receiver 15 has a magnetoresistive or a Hall sensor element 30 and the transmitter 12 has a magnet 29, then one has the necessary elements for a Hall or rotation sensor 34. Of course, other types of rotation sensors 34 as a Hall sensor 34 conceivable. Also quite different types of sensors 34 are conceivable. In particular, the previously mentioned optical sensor 34, in which the encoder 12 is scanned by electromagnetic waves, represents a further possibility. In a tacho-generator sensor 34, a voltage proportional to the speed is supplied.

An sich kann man die Ausgangssignale 31, 32 beziehungsweise die Sägezahnspannung 33 benutzen und sie zur weiteren Verarbeitung weiterleiten. Vorteilhaft ist es aber, wenn man diese Signale in eine Vierecksignal 35 umwandelt. Ein solches Vierecksignal 35 stellt ein digitales Signal dar, das von einer Vielzahl von Verbrauchern erkannt und benutzt werden kann. Spannungsverluste in den verbindenden Leitungen haben keinen Einfluss auf eine Signalqualität. Die Steilheit der Flanke variiert typischerweise zwischen 5 Mikrosekunden und 50 Millisekunden, und es werden in der Regel zumindest 90 Pulse pro Zyklus verwendet. Um die sinus- beziehungsweise kosinusförmigen Ausgangssignale 31, 32 in das Vierecksignal 35 zu verwandeln, werden die Ausgangssignale 31, 32 in Segmente mit einer vorgegebenen Frequenz geschnitten, wobei die Frequenz von der gewünschten Auflösung abhängt.In itself, one can use the output signals 31, 32 or the sawtooth voltage 33 and forward them for further processing. However, it is advantageous if these signals are converted into a quadrilateral signal 35. Such quadrilateral signal 35 represents a digital signal that can be recognized and used by a variety of consumers. Voltage losses in the connecting lines have no influence on signal quality. The slope of the edge typically varies between 5 microseconds and 50 milliseconds, and at least 90 pulses per cycle are typically used. In order to convert the sinusoidal or cosinusoidal output signals 31, 32 into the quadrilateral signal 35, the output signals 31, 32 are cut into segments of a predetermined frequency, the frequency depending on the desired resolution.

Unabhängig von einem Signaltyp dient ein Ausgabeelement 36 (Fig. 6) zu einem Ausgeben.Regardless of a signal type, an output element 36 ( Fig. 6 ) to a spend.

Um auch eine Drehrichtung der Welle 3 zu erhalten, kann man einen Speicher 37, wie er in Fig. 6 dargestellt ist, verwenden. Der Speicher 37 speichert dann mindestens zwei Werte der Winkelposition der Welle 3. Dazu kann er die sinus- beziehungsweise kosinusförmigen Ausgangssignale 31, 32 beziehungsweise die Sägezahnspannung 33 verwenden. Unter Berücksichtigung des Übergangs von 360° nach 0° wird dann auch neben der Geschwindigkeit die Drehrichtung ausgegeben.In order to obtain a direction of rotation of the shaft 3, you can see a memory 37, as in Fig. 6 is shown, use. The memory 37 then stores at least two values of the angular position of the shaft 3 it can use the sinusoidal or cosinusoidal output signals 31, 32 or the sawtooth voltage 33. Taking into account the transition from 360 ° to 0 °, the direction of rotation is also displayed next to the speed.

Claims (12)

Fluid-Rotationsmaschine mit einem Gehäuse, einer aus dem Gehäuse geführten Welle und eine Sensoranordnung, die einen Geber, der mit der Welle in Wirkverbindung steht, und einen Empfänger aufweist, dadurch gekennzeichnet, dass die Sensoranordnung (10) einen Aufnahmebereich aufweist, in dem der Geber (12) angeordnet ist, wobei der Aufnahmebereich mit dem Inneren des Gehäuses (2) in Fluidverbindung steht und nach außen abgedichtet ist und der Empfänger (15) außerhalb des Gehäuses (2) und des Aufnahmebereichs angeordnet ist.A fluid rotary machine comprising a housing, a shaft guided out of the housing, and a sensor arrangement comprising an encoder, which is operatively connected to the shaft, and a receiver, characterized in that the sensor arrangement (10) has a receiving area, in which the Encoder (12) is arranged, wherein the receiving area in fluid communication with the interior of the housing (2) and is sealed to the outside and the receiver (15) outside the housing (2) and the receiving area is arranged. Fluid-Rotationsmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Aufnahmebereich in einem Stirndeckel (9) der Fluid-Rotationsmaschine (1) ausgebildet ist.Fluid rotary machine according to claim 1, characterized in that the receiving area in an end cap (9) of the fluid rotary machine (1) is formed. Fluid-Rotationsmaschine nach Anspruch 2, dadurch gekennzeichnet, dass der Geber (12) ein Trägerelement (13) aufweist, das mit dem Stirndeckel (9) reibungsarm zusammenwirkt.Fluid rotary machine according to claim 2, characterized in that the encoder (12) is a carrier element (13) which cooperates with the front cover (9) friction. Fluid-Rotationsmaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Sensoranordnung (10) ein Sensorgehäuse (11) aufweist, in dem der Aufnahmebereich angeordnet ist.Fluid rotary machine according to claim 1, characterized in that the sensor arrangement (10) has a sensor housing (11), in which the receiving area is arranged. Fluid-Rotationsmaschine nach Anspruch 4, dadurch gekennzeichnet, dass der Geber (12) ein Trägerelement (13) aufweist, das mit dem Sensorgehäuse (11) reibungsarm zusammenwirkt.Fluid rotary machine according to claim 4, characterized in that the encoder (12) has a carrier element (13) which cooperates with the sensor housing (11) with low friction. Fluid-Rotationsmaschine nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das Sensorgehäuse (11) in einen Stirndeckel (9) der Fluid-Rotationsmaschine (1) eingeschraubt ist.Fluid rotary machine according to claim 4 or 5, characterized in that the sensor housing (11) in an end cap (9) of the fluid rotary machine (1) is screwed. Fluid-Rotationsmaschine nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass der Empfänger (15) auf das Sensorgehäuse (11) aufgeclipst ist.Fluid rotary machine according to one of claims 4 to 6, characterized in that the receiver (15) is clipped onto the sensor housing (11). Fluid-Rotationsmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Geber (12) einen Magnet (29) aufweist.Fluid rotary machine according to one of claims 1 to 7, characterized in that the encoder (12) has a magnet (29). Fluid-Rotationsmaschine nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Empfänger (15) ein magnetresistives oder ein Hall-Sensorelement (30) aufweist.Fluid rotary machine according to one of claims 1 to 8, characterized in that the receiver (15) comprises a magnetic-resistant or a Hall-sensor element (30). Fluid-Rotationsmaschine nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass Geber (12) und Empfänger (15) Elemente eines Hall-, Rotations-, Tacho-Generator- oder Optik-Sensors (34) sind.Fluid rotary machine according to one of claims 1 to 9, characterized in that the encoder (12) and receiver (15) elements of a Hall, rotation, speedometer generator or optical sensor (34). Fluid-Rotationsmaschine nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Sensoranordnung (10) ein Ausgabeelement (36) zum Ausgeben eines Vierecksignals (35) aufweist.Fluid rotary machine according to one of claims 1 to 10, characterized in that the sensor arrangement (10) has an output element (36) for outputting a quadrilateral signal (35). Fluid-Rotationsmaschine nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Sensoranordnung (10) einen Speicher (37) aufweist, in dem zumindest zwei Werte speicherbar sind.Fluid rotary machine according to one of claims 1 to 11, characterized in that the sensor arrangement (10) has a memory (37) in which at least two values can be stored.
EP11001518.7A 2010-03-25 2011-02-24 Fluid rotation machine with a sensor assembly Active EP2369172B1 (en)

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US20110236244A1 (en) 2011-09-29
US8893566B2 (en) 2014-11-25
DE102010012850A1 (en) 2011-09-29
CN102207086B (en) 2015-06-17
CN102207086A (en) 2011-10-05
EP2369172A3 (en) 2017-05-10

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