EP1070856A1 - Dispositive de détection de la position d'un piston - Google Patents

Dispositive de détection de la position d'un piston Download PDF

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Publication number
EP1070856A1
EP1070856A1 EP00114195A EP00114195A EP1070856A1 EP 1070856 A1 EP1070856 A1 EP 1070856A1 EP 00114195 A EP00114195 A EP 00114195A EP 00114195 A EP00114195 A EP 00114195A EP 1070856 A1 EP1070856 A1 EP 1070856A1
Authority
EP
European Patent Office
Prior art keywords
measuring rod
sensor
sensor element
rod
piston
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
EP00114195A
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German (de)
English (en)
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EP1070856B1 (fr
Inventor
Herbert Kleine
Stephan Berkemann
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.)
Claas Industrietechnik GmbH
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Claas Industrietechnik GmbH
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Publication date
Application filed by Claas Industrietechnik GmbH filed Critical Claas Industrietechnik GmbH
Priority to DK00114195T priority Critical patent/DK1070856T3/da
Publication of EP1070856A1 publication Critical patent/EP1070856A1/fr
Application granted granted Critical
Publication of EP1070856B1 publication Critical patent/EP1070856B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2823—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT by a screw mechanism attached to the piston

Definitions

  • the invention relates to a device for detecting the position of a piston in a cylinder, in particular a pressure medium cylinder with a piston rod having a bore, in which a measuring rod is arranged, depending on the longitudinal movement the piston rod positively guides the measuring rod by an angle of rotation and the Rotation angle converted into an electrical sensor signal by means of a sensor device becomes.
  • a sensor device on an outer surface of the cylinder tube.
  • This sensor device works with one inside the cylinder on a peripheral surface the permanent magnet attached to the piston. Because the cylinder barrel or the cylinder wall consists of a magnetic material, a switching signal on a fixed magnetic field sensitive attached to the outside of the cylinder tube Sensor element generated as soon as the piston with the permanent magnet in the area of the sensor element is moved. The switching signal thus obtained can be in one downstream electronic evaluation unit for recognizing the position of the piston in the cylinder can be evaluated.
  • a disadvantage of the known device is that the Cylinder due to the attachment of the sensor element on the outside of the cylinder tube unwanted projections, which the cylinder is asymmetrical Gives surface contour and on the other hand requires a larger radial space.
  • the electrical lines connected to the sensor device must be in the vicinity to a central evaluation unit.
  • a sensor device with magnetic field sensitive Sensors in an axial extension to a position to be detected to arrange cylindrical part.
  • the known part to be detected it is a steering shaft of a steering wheel for motor vehicles, in which the Angle of rotation of the same is to be detected.
  • this known sensor device is only suitable for detecting the twisting of an elongated part. The capture the axial position, in particular of a piston, is from this known device not removable.
  • DE 195 45 923 A1 describes a device for detecting the position of a piston in known a cylinder with a piston rod which is provided with a bore in which a measuring rod is arranged.
  • a fixed sensor element is also provided, which includes the measuring rod within the bore of the piston rod. By relative shift the measuring rod to the fixed sensor element is inductive generates a sensor signal depending on the displacement of the piston rod.
  • the well-known Device is relatively complex and requires a relatively large amount of space because on the one hand, the measuring rod must be firmly connected to the piston rod within the bore must and must be provided on the other hand, the low-friction displaceability of the fixed sensor element relative to the measuring rod and the piston rod guarantee. Adequate sealing of the stationary sensor element must also be ensured be provided to the interior of the cylinder.
  • the object of the present invention is therefore a device for detecting the position to further develop a piston in a cylinder such that the position of the piston is simple Wise and reliable can be detected, the known shortcomings remedied as far as possible should be.
  • the invention is in connection with the preamble of the claim 1 characterized in that the sensor device at least one fixed Sensor element outside the pressure medium area and a movable one, from the Measuring rod driven, sensor element within the pressure medium area and the movement of the driven sensor element without contact from the fixed Sensor element is detected.
  • the particular advantage of the invention is that the design of the sensor device results in a simple measuring system which determines the relative position of the piston rod relative to the cylinder housing.
  • the contactless determination of the rotary movement of the measuring rod is particularly advantageous. This eliminates complex rotary unions, which lead to a reduction in costs and at the same time to new fields of application for the measuring system according to the invention.
  • By attaching the fixed sensor element outside the pressure medium area it can be configured in a particularly simple manner, since there are no special requirements with regard to the pressure medium and the pressure in the pressure medium. Only the environmental conditions, such as moisture and dust protection outside the lifting cylinder, must be taken into account when designing the sensor element.
  • Arranging the sensor device in an edge region of a pressurized space has the advantage that the space required for the lifting cylinder is not increased. Furthermore, a sensor device can easily be introduced into the lifting cylinder base. There is usually, to hold the cylinder, structurally unnecessary housing material into which the sensor device can be easily integrated without changing the function or the size of the lifting cylinder. This installation position also prevents damage to the sensor device from the outside. This installation position on the cylinder bottom also enables easy access to the sensor device, since the lifting cylinder does not have to be dismantled for mounting or checking the device.
  • Known sensor devices such as those which operate according to the magnetic, inductive or capacitive measuring principle, are available for the contactless transmission of the rotary movement of the measuring rod to the fixed sensor element.
  • the movable sensor element can be designed according to the measuring principle used and the movement of the measuring rod can be converted into a correspondingly recognizable signal depending on the measuring principle used. This can be a change in the distance between the two sensor elements, a rotation of the elements relative to one another, or also by constructive configurations of the elements with a corresponding movement of the same.
  • a removable sensor housing in the cylinder base which is equipped on the circumferential side with a seal and on the one hand receives the fixed sensor element from the pressure medium and on the other hand has a recess on the side connected to the pressure medium, which serves to receive a connecting element connected to the front end of the measuring rod, the connecting element being rotatably mounted in the recess about the longitudinal axis of the measuring rod.
  • This embodiment represents a particularly simple embodiment that is easy and inexpensive to manufacture.
  • the sensor housing is a simple turned part with a circumferential groove for receiving a seal and a recess on both end faces. In the recess, on the side of the sensor housing facing away from the pressure medium, the fixed sensor element can easily be attached.
  • the sensor element itself can in turn be connected directly to evaluation electronics and can be fastened in the recess of the sensor housing directly by means of a casting compound, clamping, pressing or screwing.
  • the sensor housing itself is fixed in a bore made centrally in the measuring rod arrangement in the cylinder base and closes the cylinder base from the pressure medium area.
  • Another stepped recess is provided on the pressure medium side of the sensor housing. This is used for fixing or mounting a connection element which has a congruent shape to the recess and is connected to the measuring rod. Due to the position of the sensor housing in the lifting cylinder base, the measuring rod is also fixed in the recess with respect to the piston rod.
  • the congruent shape of the connecting element end to the recess in the sensor housing brings about an almost play-free mounting of the connecting element in the recess. This is particularly advantageous since the movements of the connecting element made possible by play in this bearing lead to a change in the measuring accuracy.
  • This storage also enables a free rotary movement of the connecting element in connection with the measuring rod in the sensor housing.
  • connection element can be configured further by the connection element is designed for fixing and storage with a ring element, which on the one hand on a shoulder of the cylinder bottom and on the other hand in the recess supports.
  • a ring element which on the one hand on a shoulder of the cylinder bottom and on the other hand in the recess supports.
  • the connecting element has a central bore for receiving the front end of the measuring rod and the measuring rod is detachably and articulably connected to the connecting element in the bore by means of a bolt running transversely to the longitudinal axis thereof.
  • This configuration has the advantage that the measuring rod is decoupled in the axial direction from the connecting element at least in a certain area.
  • different orientations of the axes of the piston rod and measuring rod are compensated for and thus reduce the wear on the bearing of the measuring rod and on the guide element.
  • different materials can be coupled to one another through this connection point.
  • the connecting element can advantageously be made of a metallic material and the measuring rod made of a non-metal and connected. In this way, differently worn components can also be replaced and replaced independently of one another, and the standardized sensor elements can be adapted with a measuring rod length or twist embodiment adapted to the use of the pressure medium cylinder.
  • the sensor housing is in a special embodiment of the invention, on one of the Back of the measuring rod facing away from the cylinder base by means of a holding element attached.
  • the sensor element can be securely fixed in the cylinder base can also be easily removed from there.
  • the insertion in the cylinder bottom also enables a reduction in the manufacturing costs of the lifting cylinders used, by optionally also, for example, a pressure measurement system at the same location or a closure element can be inserted and fixed by means of the holding element.
  • the holding element is advantageously a Seegering, which engages in a groove in the bore of the cylinder bottom.
  • the movable sensor element as a permanent magnet and the fixed sensor element as a magnetic field sensitive Sensor element formed.
  • the movable sensor element is firmly attached to the Measuring rod connected connecting element bordered. In cooperation with the fixed Sensor element of the sensor device, this enables a non-contact measurement the path of the piston rod.
  • a movement of the piston rod is in a rotation of the measuring rod and a corresponding rotary movement of the connecting element transferred.
  • the sensor housing and / or the connecting element is advantageous made of a non-magnetizable material such as brass, whereby an improved effect of the measuring principle is achieved.
  • various sensors such as magnetoresistive sensors, Hall sensors and known as field plates. It has proven particularly cost-effective for mass use the Hall sensors. These can be opened easily with a small space requirement integrate an electronic circuit and then with additional evaluation circuits and equip interfaces.
  • the sensor device there is at least one permanent magnet aligned in the end portion such that the magnetic axis of the permanent magnet is perpendicular to the longitudinal axis of the measuring rod, and that at least one sensor element in radial distance to the permanent magnet is arranged within the sensor housing.
  • a permanent magnet In the end section of the connection element there is a permanent magnet with the magnet axis arranged perpendicular to the axis of rotation of the connecting element.
  • At least a magnetic field sensitive Sensor is on the circumference of the side facing the connection element the recess in the sensor housing and is, at least in the position with the smallest distance to one of the pole faces, approximately perpendicular to the magnetic field flows through.
  • Two or more sensors sensitive to magnetic fields are advantageous distributed around the circumference of the recess, thereby providing a more precise evaluation the position of the connecting element in the recess is made possible.
  • the decrease in Strength of the magnetic field through a sensor element is simultaneously increased by an Strength of the magnetic field recognized in the further sensor element.
  • Evaluation electronics evaluates the measured values of the magnetic field-sensitive sensors according to direction and strength of the magnetic field and determines the angle of rotation of the connecting element in the recess.
  • the evaluation electronics can determine the position of the piston recognize in the zero position and the associated angle of rotation. Furthermore, the Evaluation electronics the angle of rotation of the measuring rod directly into the position of the piston relative convert to the cylinder tube as a direct path signal.
  • the evaluation electronics can be provided with a microprocessor and storage means and also have an interface that communicates with a CAN bus system, for example.
  • At least one permanent magnet is on the End section is aligned that the magnetic axis of the permanent magnet radially offset in Direction to the longitudinal axis of the measuring rod, and that at least one sensor element approximately arranged centrally to the longitudinal axis of the measuring rod within the sensor housing are.
  • This arrangement of the sensor elements relative to one another can achieve that only the direction but not the strength of the magnetic field when the connection element rotates changed by the magnetic field sensitive sensor element.
  • the permanent magnet can be designed as a bar magnet and directly in an end hole on the connection element be arranged. The decentralized arrangement changes the direction of the Magnetic field through the centrally arranged, fixed sensor element when twisted of the connecting element in the recess on the sensor housing.
  • the magnetic field can also be generated by several permanent magnets.
  • the arrangement of two permanent magnets coaxial to the direction of rotation in the same is advantageous radial distance from the axis of rotation in a complementary orientation.
  • the magnetic field sensitive Sensor element is arranged centrally in the sensor housing and so executed that it can recognize the magnetic field direction. This is special Cost-effective because the magnetic field-sensitive sensor is simple and directly in one Integrated electronics module and so easily connected to other evaluation circuits can be.
  • the design of the measuring rod specifies the rotary movement of the connecting element in the recess in the sensor housing.
  • the measuring range or the measuring resolution can be predetermined solely by this design of the measuring rod.
  • the object causing the rotation such as a piston in a cylinder, only needs to have a bore with an opening cross section that corresponds to the contour of the measuring rod in cross section.
  • the execution of the measuring rod with a pitch-sized twist of at least 70 ° is particularly advantageous. In this way, long strokes of a piston can be recognized with a simple measuring rod with few twists. In addition, the large slope keeps the friction between the elements low.
  • slope angles in this area prevent the elements brought together from being unsuitable for transmitting a rotary movement and thus not being able to stimulate a mutual rotary movement. This reduces wear on the management and bearing points and minimizes the play between the elements.
  • the torsion of the measuring rod extends evenly over the entire length of the measuring rod.
  • the twist extends helically essentially along a circumferential angle of 360 °. This allows for easy A clear dependence of the angle of rotation of the measuring rod on the longitudinal movement achieve the piston rod because the connecting element over the entire stroke movement of the piston only undergoes a maximum of one revolution. On a special evaluation and determination of the completed number of revolutions of the measuring rod can according to the invention to be dispensed with.
  • the measuring rod can only show torsion in some areas.
  • the displacement measuring system according to the invention can be limited to the piston stroke range in which a special evaluation or only there a displacement measurement is necessary.
  • the measuring rod is only provided with a twist in the middle, for example, and configured in the further measuring rod region in such a way that there is no change in pitch and therefore no rotation of the measuring rod is caused in these stroke regions of the piston.
  • This embodiment is particularly suitable for movements which can be carried out by the lifting cylinder and which have a position different from the end stops of the piston, in which the position of the piston must be controlled or regulated or recognized in a particular manner.
  • the measuring rod has a twist only in the stroke range corresponding to the working position, for example to enable detection and possibly also control of the working position there.
  • this is provided with a twist in at least two places. In this way, individual positions of the piston and, if necessary, positions of actuated elements can be recognized and controlled. In this way, individual position detection means arranged outside the lifting cylinder can be saved in a cost-effective manner and no additional installation space is then required.
  • the measuring rod has areas with different Increases in torsion.
  • the measuring rod twist can be applied to the respective Adjusted requirement, be trained differently. This is a special one Advantage of the sensor device according to the invention over the known position and Position measuring systems. Due to the shape or the different slopes the torsion of the measuring rod results in special areas and forms of application, in which otherwise use is made of position detection means arranged outside the cylinder had to become. According to the invention, these can be shifted into the lifting cylinder and therefore no longer require additional installation space and are also available Damage is protected. Have different twists and turns the advantage that the measuring rod to the specific requirements along the piston stroke can be adjusted.
  • the measuring rod with different gradients of twist Mistake.
  • the measuring rod is equipped with a large slope of torsion, so that the measuring rod is only slightly rotated at these piston positions.
  • the measuring rod is provided with a smaller slope, so that in this piston stroke range occurs a greater twist of the connecting element.
  • the measuring rod is designed so that the measuring rod only have a twist of the rod at the ends and in the intermediate one Area there is no twisting of the measuring rod.
  • the individual end positions are of particular importance in order to to implement, for example, a so-called end position damping in terms of control technology can.
  • the inventive sensor device can also be used only as a position indicator the end positions of the piston are used.
  • the length of the measuring rod does not extend over the entire stroke of the piston rod. This considerably simplifies the sensor device, since then the bore in the piston rod does not have to be made over the entire piston stroke.
  • Such designs are particularly suitable if the position of the piston only has to be detected in the lower, retracted piston position. If the piston stroke exceeds the measuring rod length, this is then no longer guided by the guide part in the piston head and is then free in the cylinder.
  • the measuring rod end is then advantageously provided with a taper in order to be able to ensure that the measuring rod can be found again and securely inserted into the piston bore when the piston is immersed again in the measuring range. It is particularly advantageous if the measuring rod corresponds at least to the full stroke length of the piston rod. This ensures that the measuring rod is securely guided at all times.
  • the guide element has, at a free end, a resilient nose oriented inwards in the radial direction, which rests at least in regions on the peripheral surface of the measuring rod.
  • This configuration of the guide element enables particularly precise guidance of the measuring rod in the bore of the piston rod.
  • the nose acts slightly resiliently on the measuring rod and thus ensures that the measuring rod is guided without play. Wear on the measuring rod or on the guide element is also compensated for by the guide element itself in a certain range.
  • the nose of the guide element is hook-shaped and is equipped with a sealing lip which clings to the circumferential surface of the same in the direction of the measuring rod.
  • This hook-shaped configuration provides a special guiding property of the measuring rod in the bore of the piston rod, in that it also compensates for slight twisting of the circumferential surfaces of the measuring rod due to the sealing lip. Also, due to the slight surface guidance of the hook-shaped nose acting in the axial direction of the measuring rod, a good guiding property is achieved at the transitions between different gradients of the twisting of the measuring rod.
  • the measuring rod can also be further developed by the measuring rod has at least one hook-shaped support element which areas of the measuring rod clinging to the central bore on the peripheral surface of the same supports.
  • this embodiment is particularly suitable for longer ones Measuring rod in front of these in the retracted areas and positions of the piston rod to protect radial movements.
  • the opposite of the connecting element Side of the measuring rod attached a hook-shaped support element in a ring.
  • the measuring rod is made a little longer than necessary for the maximum piston stroke, so that the guide element and the support element in the extended position of the Do not interfere with the piston rod.
  • the measuring rod is generally from the connecting element held in the axial direction and by the guide element or guided the support element in the radial direction, the support element being designed such that it has no guiding properties related to the measuring rod.
  • This is the support element on the one hand on the outer contour of the measuring rod and on the other hand on the contour adapted to the bore in the piston rod.
  • a tractor 1 shown schematically in FIG. 1 has a front shovel 2 for lifting, transporting and loading goods, which can be actuated by means of first lifting cylinders 3 and second lifting cylinders 4 arranged in pairs.
  • the first lifting cylinders 3 serve to raise and lower the front loader rocker 5 and in connection therewith also the bucket 2.
  • the second lifting cylinders 4 serve to pivot the front bucket 2 relative to the front loader rocker 5.
  • the lifting cylinders 3, 4 are designed as hydraulic cylinders and are essentially of the same type. For example, the actuation of the second lifting cylinder 4 is described in more detail below in connection with FIGS. 2 and 3.
  • the second lifting cylinders 4 are used to adjust the front shovel 2, which is articulated on a front loader arm 5.
  • a console 6 for receiving the front loader arm 5 connects to the body of the agricultural tractor 1 on this front loader arm 5.
  • the front loader rocker arms 5 are in the upper and lower positions different positions of the front bucket 2 are shown relative to the front loader arm 5.
  • the position of the front loader arm 5 itself to the console 6 and the position of the front shovel 2 relative to the front loader rocker arm 5 can be simplified in a more inventive manner This is done by determining the relative piston positions to the respective cylinder tube 7 determine.
  • the front blade 2 is in a retracted position of the lifting cylinder 4 according to FIG. 2 in a transport position while it is in an extended position of the lifting cylinder 4 3 is in a dump position.
  • the controls of front loaders own usually an automatic parallel guidance of the front blade 2 to the footprint of the Agricultural tractor 1. This is done by a controller, depending on the position of the lifting cylinder 3, electro-hydraulic automatic one piston position on the two two lifting cylinders 4 set so that the bottom of the front blade 2 over the entire swivel path the front loader arm 5, from the lower to the upper position, parallel to the footprint the tractor 1 is held.
  • the position of the piston in at least one of the Lift cylinder 3 is determined by means of the measuring system according to the invention and sent to a controller to hand over.
  • the length of at least one lift cylinder 4 is in turn with an inventive Measuring system determined and reported back to the control.
  • the lifting cylinder 3 or 4 itself has a cylinder tube 7 in which a piston 8 is mounted so as to be longitudinally displaceable.
  • the piston 8 is firmly connected to a piston rod 9.
  • the piston rod 9 has a hinge eye 10 at a first end, which is connected, for example, in an articulated manner to a blade joint part 11 on the front loader rocker arm 5.
  • the piston rod 9 has a central bore 12 and a guide element 45 at one end facing away from the joint eye 10, so that a measuring rod 13 is guided as a measuring element so as to be longitudinally movable relative to the piston rod 9.
  • the piston rod 9 is hollow-bored and rests with the guide element 45 on the measuring rod 13 at least in regions on the circumference.
  • the measuring rod 13 has an incline-size over the entire length Twist 14, which extends along a circumferential angle of 360 ° over the extends the entire length of the measuring rod.
  • the measuring rod 13 is preferably in cross section rectangular, the edges of the rectangle each from one of the Piston rod 9 facing away from end face 15 to an end face facing piston rod 9 16 continuously and helically (helically) a circumferential angle of Cover 360 °.
  • a permanent magnet shown schematically in FIG 19 framed in a connecting element 20 firmly connected to the measuring rod 13.
  • This connecting element 20 is rotatably movable in a radial recess 21 of a mounted in the cylinder bottom 18 mounted sensor housing 22.
  • the sensor housing 22 has at least one bore for receiving a sensor element 24, which is at a radial distance from the permanent magnet 19 within the sensor housing 22 is arranged. This provides depending on the magnetic field of the permanent magnet 19 a sensor signal, which is evaluated in an electronic evaluation system and as a position measuring signal can be transmitted to a central control unit.
  • the evaluation electronics preferably assigned directly to the sensor element 24 and together with it in one Unit arranged within the sensor housing 22.
  • the sensor housing 22 itself can consist of a non-magnetizable material in which the sensor element 24 is enclosed.
  • the sensor element 24 is preferably one that works according to the Hall principle Hall sensor element formed.
  • the cylinder base 18 has an articulated eye for the articulated fastening of the lifting cylinder 3, 4 25 on.
  • this has a first hydraulic connection 27 in the cylinder base 18 and a second hydraulic connection 28 in one with connected to the cylinder tube 7 cylinder head 29. Through these connections 27, 28 a hydraulic fluid is supplied or discharged into the cylinder interior.
  • the piston rod 9 When pressurized of the cylinder 4, the piston rod 9 is moved in the longitudinal direction, the Measuring rod 13 according to the orientation of the twist 14 in a predetermined Direction of rotation 32 is rotated.
  • the sensor housing in the sensor housing also several sensor elements arranged uniformly in the circumferential direction in an outer ring of the sensor housing 22 may be arranged.
  • a plurality of sensor signals uniquely determine the position of the piston 8. The fact that the twist 14 only over an angle of rotation Extends 360 °, several intermediate positions of the piston 8 - not just the end positions 2 and 3 - are detected.
  • the measuring rod 13 is connected by means of a transverse bolt 17 connected to the connecting element 20.
  • the bolt 17 is in a transverse bore in the measuring rod 13 stored.
  • the connecting element 20 is plate-shaped and has a ring element 34, which is supported on a shoulder 35 of the cylinder bottom 18.
  • the connector 20 has a recess 36 on a side facing the measuring rod 13, in which can engage the end 15 of the measuring rod 13.
  • On one of the measuring rods 13 facing away from the ring element 34 is an end portion 37, which together is positioned with the ring element 34 in the cylinder base 18.
  • at least one movable sensor element is designed as a permanent magnet 19 arranged.
  • the holding element 38 is preferably designed as a retaining ring and is used for releasable attachment the sensor housing 22 or the connecting element 20 and the measuring rod 13 inside the cylinder tube 7.
  • the sensor housing 22 is in a groove by a seal 39 includes, which seals the pressure area of the lifting cylinder from the environment and arranged between the wall 40 of the cylinder bottom 18 and the sensor housing 22 pressed is.
  • the sensor housing 22 and the connecting element 20 are preferably made of a metallic Material, in particular brass, within which the sensor element 24 or the permanent magnet 19 are edged.
  • the piston rod 9 On a side facing the sensor housing 22, the piston rod 9 is with a Damping pin 41 formed.
  • the damping pin 41 extends in accordance with FIG. 2 shows the end position in a constriction section 42 of the cylinder tube 7 and enables hydraulic cushioning of the piston 8 in the retracted position the same.
  • the guide element 45 is frictional or non-positive used and has a resilient nose 43 which radially inwards against the measuring rod 13 presses.
  • the nose 43 can consist of a rigid plastic material.
  • the Contour of the guide element 45 corresponds at least in regions to the contour of the Measuring rod 13. It can be polygonal, preferably quadrangular.
  • the guide element 45 is also aligned coaxially to the piston rod 9.
  • Figure 5 shows a measuring rod 13 which is provided with a twist over the entire length of the measuring rod. It is shown here in an expanded form and, depending on the design and application of the measuring rod 13, can additionally be equipped with guide or holding elements, such as a bore, at the ends. Due to the fact that the measuring rod 13 is arranged in a stationary manner and has a twist 14 shaped in accordance with FIG. 5, the measuring rod 13 is rotated by an angle of rotation ⁇ in the event of an axial displacement of the piston 8 or the piston rod 9 about the longitudinal axis of the piston rod 9, so that a Corresponding angle-dependent signal is recognized by the sensor device.
  • the relationship between the translational path of the piston 8 or the piston rod 9 and the angle of rotation ⁇ of the measuring rod 13 can be determined by a characteristic curve.
  • a measuring signal representing the positioning of the piston rod 9 or the change in displacement thereof is thus formed.
  • the twist 14 of the measuring rod 13 has one in relation to the longitudinal direction of the measuring rod 13 forming angle of inclination ⁇ of at least 70 °, preferably 76 °.
  • the slope angle ⁇ should not fall below an inhibition angle ⁇ of 76 °.
  • Characterized in that the measuring rod 13 is locked in the longitudinal direction by the cross bolt 17, can additionally a decoupling between the connecting element 20 on the one hand and the Measuring rod 13 on the other hand. If the measuring rod 13 and the connecting element 20 can automatically compensate by pivoting about the Bolt axis of the bolt 17 are brought about.
  • a measuring rod 45 is provided, each of which has a twist 46 in the region of the front ends.
  • the twists 46 each sweep a circumferential angle of 180 °, so that there is a twist of 360 ° over the entire length of the measuring rod 45 and thus a clear assignment is given.
  • This measuring rod 45 is used to determine the position of the piston rod in an end region thereof.
  • the measuring rod 45 can preferably be used for end position damping.
  • the twist can also be arranged in any area of the measuring rod 13. The arrangement can be dependent on the use of the piston rod 9 or the piston 8. The measuring range is therefore determined solely by the shape of the measuring rod.
  • the measuring rod 13 and the piston rod 9 performs a calibration of the evaluation electronics.
  • This hysteresis error would have a negative impact on the Impact measurement result. Therefore a reference measurement is carried out in which the piston rod 9 Move the entire length in one direction and then in the other becomes.
  • a rotation angle characteristic curve is recorded depending on the path and in the Evaluation electronics saved. After recording this characteristic curve, the hysteresis error and the measured sensor value depending on the direction of movement the piston rod 9 is corrected in accordance with the determined hysteresis error become.
  • This calibration process is one-off after the sensor device has been installed or the measuring rod 13 made in the lifting cylinder 3.4.
  • the measuring rod 13 and the piston rod 9 can each be made of a metallic Material or be formed from a plastic.
  • the guide element 45 can also be in one piece be connected to a damping pin 41 and has an inwardly deflected Sealing lip 44 which, as shown, clings to the guide surfaces of the measuring rod 13.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Eye Examination Apparatus (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
EP00114195A 1999-07-19 2000-07-14 Dispositive de détection de la position d'un piston Expired - Lifetime EP1070856B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK00114195T DK1070856T3 (da) 1999-07-19 2000-07-14 Indretning til bestemmelse af positionen af et stempel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19933073A DE19933073A1 (de) 1999-07-19 1999-07-19 Vorrichtung zur Erfassung der Lage eines Kolbens
DE19933073 1999-07-19

Publications (2)

Publication Number Publication Date
EP1070856A1 true EP1070856A1 (fr) 2001-01-24
EP1070856B1 EP1070856B1 (fr) 2005-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00114195A Expired - Lifetime EP1070856B1 (fr) 1999-07-19 2000-07-14 Dispositive de détection de la position d'un piston

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WO2005038270A1 (fr) * 2003-10-17 2005-04-28 Clark Equipment Company Procede et appareil pour capteur de position de course pour verin hydraulique
US20130174727A1 (en) * 2010-10-26 2013-07-11 Jlg Industries, Inc. Cylinder length sensor mounting/retaining assembly
US9656530B2 (en) 2005-09-12 2017-05-23 Wirtgen Gmbh Automotive construction machine, as well as lifting column for a construction machine
US9879390B2 (en) 2006-12-22 2018-01-30 Wirtgen Gmbh Road milling machine and method for measuring the milling depth
CN114136254A (zh) * 2021-11-01 2022-03-04 庆安集团有限公司 作动器活塞杆可旋转的外置线位移传感器防扭转结构

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Publication number Priority date Publication date Assignee Title
DE10059542A1 (de) * 2000-11-30 2002-06-06 Deere & Co Landwirtschaftliche Maschine oder Gerät mit Positionierungszylinder
DE102019104768A1 (de) 2019-02-26 2020-08-27 Amazonen-Werke H. Dreyer Gmbh & Co. Kg Vorrichtung zur Erfassung der Hubhöhe einer Kolbenstange innerhalb eines Zylinders

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US3403365A (en) * 1964-05-04 1968-09-24 Gen Electric Shielded transducer having means to reduce core movement
DE7201445U (de) * 1972-04-06 Weiste H Langenveranderhcher hydraulischer Stellzylinder
US3654891A (en) * 1968-12-30 1972-04-11 Norsk Hydro Verksteder As Gauge cylinder assembly for position indicator and indicator system including such cylinder
DE2344143A1 (de) * 1972-10-23 1974-04-25 Anciens Ets Paul Wurth Luxembu Vorrichtung zur bestimmung der stellung des kolbens eines hydraulisch bzw. pneumatisch betriebenen zylinders
FR2216467A1 (fr) * 1973-10-09 1974-08-30 Poclain Sa
GB1369673A (en) * 1972-02-07 1974-10-09 Dowty Mining Equipment Ltd Fluid-operated jack with position signalling device
DE2339324A1 (de) * 1973-08-03 1975-02-13 Rexroth Gmbh G L Arbeitszylinder mit stellungsanzeigevorrichtung
US3956973A (en) * 1972-07-11 1976-05-18 Basic Aluminum Castings Company Die casting machine with piston positioning control
GB1526211A (en) * 1976-01-08 1978-09-27 Hydraulics & Pneumatics Ltd Devices for producing signals according to the position of a piston in a cylinder
US4386552A (en) * 1980-06-16 1983-06-07 Foxwell W John Power cylinder with internally mounted position indicator
US4552055A (en) * 1981-02-09 1985-11-12 Prince Manufacturing Company Power cylinder with internally mounted position indicator
EP0893668A1 (fr) * 1997-07-26 1999-01-27 Philips Patentverwaltung GmbH Capteur d'angle

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DE7201445U (de) * 1972-04-06 Weiste H Langenveranderhcher hydraulischer Stellzylinder
US2936737A (en) * 1955-07-25 1960-05-17 Miller J Carter Rotary actuator
US3403365A (en) * 1964-05-04 1968-09-24 Gen Electric Shielded transducer having means to reduce core movement
US3654891A (en) * 1968-12-30 1972-04-11 Norsk Hydro Verksteder As Gauge cylinder assembly for position indicator and indicator system including such cylinder
GB1369673A (en) * 1972-02-07 1974-10-09 Dowty Mining Equipment Ltd Fluid-operated jack with position signalling device
US3956973A (en) * 1972-07-11 1976-05-18 Basic Aluminum Castings Company Die casting machine with piston positioning control
DE2344143A1 (de) * 1972-10-23 1974-04-25 Anciens Ets Paul Wurth Luxembu Vorrichtung zur bestimmung der stellung des kolbens eines hydraulisch bzw. pneumatisch betriebenen zylinders
DE2339324A1 (de) * 1973-08-03 1975-02-13 Rexroth Gmbh G L Arbeitszylinder mit stellungsanzeigevorrichtung
FR2216467A1 (fr) * 1973-10-09 1974-08-30 Poclain Sa
GB1526211A (en) * 1976-01-08 1978-09-27 Hydraulics & Pneumatics Ltd Devices for producing signals according to the position of a piston in a cylinder
US4386552A (en) * 1980-06-16 1983-06-07 Foxwell W John Power cylinder with internally mounted position indicator
US4552055A (en) * 1981-02-09 1985-11-12 Prince Manufacturing Company Power cylinder with internally mounted position indicator
EP0893668A1 (fr) * 1997-07-26 1999-01-27 Philips Patentverwaltung GmbH Capteur d'angle

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Publication number Priority date Publication date Assignee Title
US7059238B2 (en) 2003-10-17 2006-06-13 Clark Equipment Company Method and apparatus for stroke position sensor for hydraulic cylinder
CN100487254C (zh) * 2003-10-17 2009-05-13 克拉克设备公司 液压缸的冲程位置传感器的方法和设备
WO2005038270A1 (fr) * 2003-10-17 2005-04-28 Clark Equipment Company Procede et appareil pour capteur de position de course pour verin hydraulique
US9656530B2 (en) 2005-09-12 2017-05-23 Wirtgen Gmbh Automotive construction machine, as well as lifting column for a construction machine
US9879391B2 (en) 2006-12-22 2018-01-30 Wirtgen Gmbh Road milling machine and method for measuring the milling depth
US12006642B2 (en) 2006-12-22 2024-06-11 Wirtgen America, Inc. Road milling machine and method for measuring the milling depth
US11655599B2 (en) 2006-12-22 2023-05-23 Wirtgen America, Inc. Road milling machine and method for measuring the milling depth
US9879390B2 (en) 2006-12-22 2018-01-30 Wirtgen Gmbh Road milling machine and method for measuring the milling depth
US20130174727A1 (en) * 2010-10-26 2013-07-11 Jlg Industries, Inc. Cylinder length sensor mounting/retaining assembly
US9482245B2 (en) * 2010-10-26 2016-11-01 Jlg Industries, Inc. Cylinder length sensor mounting/retaining assembly
CN103210182A (zh) * 2010-10-26 2013-07-17 Jlg工业公司 汽缸长度传感器安装/固定组件
CN114136254A (zh) * 2021-11-01 2022-03-04 庆安集团有限公司 作动器活塞杆可旋转的外置线位移传感器防扭转结构
CN114136254B (zh) * 2021-11-01 2024-04-09 庆安集团有限公司 作动器活塞杆可旋转的外置线位移传感器防扭转结构

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DE19933073A1 (de) 2001-01-25
ATE296964T1 (de) 2005-06-15
EP1070856B1 (fr) 2005-06-01
DK1070856T3 (da) 2005-10-03

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