WO1991014871A1 - Piston position sensing device - Google Patents

Piston position sensing device Download PDF

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Publication number
WO1991014871A1
WO1991014871A1 PCT/SE1991/000072 SE9100072W WO9114871A1 WO 1991014871 A1 WO1991014871 A1 WO 1991014871A1 SE 9100072 W SE9100072 W SE 9100072W WO 9114871 A1 WO9114871 A1 WO 9114871A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
position sensor
cylinder tube
adjustable
sensor
Prior art date
Application number
PCT/SE1991/000072
Other languages
French (fr)
Inventor
Torbjörn JOSDAL
Original Assignee
Ab Mecman
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 Ab Mecman filed Critical Ab Mecman
Publication of WO1991014871A1 publication Critical patent/WO1991014871A1/en

Links

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
    • 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
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches

Definitions

  • the invention concerns a device for sensing the position of a piston in the inside of a fluid pressure cylinder, of the kind defined in the preamble of claim 1.
  • sensing devices of this kind comprise a guide for the position sensor, being situated on the outside of the cylinder tube, e.g. forming a longitudinal bead formed integrally with the cylinder tube or in the form of a tension rod disposed between the end plates of the fluid pressure cylinder.
  • the sensor is fastened on the outside of the cylinder tube by means of a hose clamp.
  • One advantage with such an outer placing of the position sensor is that it is easily accessible and thus may easily be fastened in any desired position, usually by means of fastener screws.
  • a position sensor at the outside is exposed to damages from external mechanical or chemical influences.
  • the electrical connections of the sensor are exposed to damage and often have to be protected by covers or the like making an altered positioning of the position sensor more difficult.
  • the aim of the invention is to achieve a device of the kind stated above, which eliminates the above indicated drawbacks and at the same time facilitates production, mounting and positioning of the position sensor along its guide.
  • the position sensor or sensors are well protected within a cavity in the wall of the cylinder tube, whereas the outside of the cylinder tube may be free from protruding elements.
  • the fastening of the position sensor in a desired axial position along the cavity serving as a guide can be achieved in different ways, e.g. by means of fastening screws through the material of the cylinder tube between the outside and the cavity.
  • position rods are used, each extending from the respective cylinder tube end to the position sensor as stated in claim 2, said position rods being fastenable in desired
  • the rod or the rods may cooperate with the associated position sensor by means of a screw thread being engaged to a gear rack on the sensor, the positioning being effected by rotation of the position rod
  • the two position rods abutting the position sensor from each side may preferably be fastened by means of the above-mentioned locking means and be cut off at the ends of the cylinder tube.
  • the position of the sensor may be changed by releasing the locking means, inserting a new rod from one end (so that the sensor is slid correspondingly), cutting off the protruding rods and locking the rods in the new position.
  • Electric connection to the respective position sensor may preferably be accomplished by means of at least one electrically conductive rail, extending within the cavity and interacting with connecting elements on the position sensor, as stated in claims 4-9.
  • each sensor is preferably provided with a projection, protruding into a respective guide channel, for the associated position rod, the two guide channels communicating, with a central portion of the cavity (as stated in claim 10).
  • two or more position sensors may of course be arranged in separate, axial ly extending cavities, one for each sensor.
  • Fig. 1 shows a fluid pressure cylinder in a partly cut sideview with the central portion cut away
  • Fig. 2 shows a cross section through the cylinder tube with its cavity
  • Fig. 3 shows a cross section through a profiled element with electric connecting wires
  • Fig. 4 shows a cross section of the profiled element according to Fig. 3 together with a first position sensor
  • Fig. 5 shows correspondingly to Fig. 4 a second position sensor together with the profiled element and the position rods
  • Fig. 6 shows in a plane view from below the two position
  • the fluid pressure cylinder shown in Fig. 1 comprises a cylinder tube 1, within which a not shown piston is slidable between two end plates 2, 3, whereas a piston rod 4, which is connected to the piston, extends through one of the end plates 3.
  • the position of the piston is sensed by means of two position sensors 5, 6, e.g. of magnetoresistive type, which emit a position indicating signal when the piston reaches a certain position relative to the respective sensor.
  • this cavity is arranged in the upper part, while further longitudinal channels 8a, 8b, 8c, 8d for the reception of tension rods or fastening screws for the end plates (not shown) are provided at the sides of the cylinder tube.
  • the cavity 7 comprises an upper portion 7a with guide slots 7b, 7c projecting laterally on both sides, in which upper portion a profiled element 9 of a synthetic material with a number of electrically conductive rails 10a-e is inserted, and a central portion 7d with guide channels 7e, 7f associated laterally thereto on each side.
  • the position sensors 5 and 6 are placed in the central portion 7d of the cavity, one position sensor 5 being provided with a lateral projection 5a, protruding into the guide channel 7e, and the other position sensor 6 being provided with a lateral projection 6a, that protruding into the other guide channel 7f (c.f.Fig. 4, 5 and 6).
  • the two position sensors 5, 6 can be displaced independently by means of its respective pair of position rods 11a, 11b resp. 12a, 12b, being guided in the respective guide channel 7e, 7f.
  • the rods 11a, 11b resp. 12a, 12b are locked by means of locking screws 13a, 13b and cut off at the ends of the cylinder tube. If a position sensor is to be displaced hereafter, the associated locking screws are released and a new rod is inserted, whereafter the screws are locked and the protruding rod ends are removed.
  • the position rods, at least one in each pair may suitably be provided with a longitudinal scale or markings facilitating the determination of the position of the associated sensor.
  • Each position sensor 5, 6 is supplied with electrical energy through a common conductor rail 10c and a conductor rail 10b and 10d, respectively, while a piston position indicating signal is emitted through an outer signal rail 10a and 10e, respectively.
  • the position sensor 5 is provided with three contact tongues 14a, 14b, 14c, making contact with the rails 10a, 10b and 10c
  • the position sensor 6 is provided with contact tongues 15c, 15d, 15e making contact with the respective rails 10c, 10d and 10e.
  • the rails 10a-e are connectd e.g. to a
  • central unit with a power source and to a signal indicating device or the like, via terminals 16, 17 (Fig. 1) and a cable (not shown).
  • the above described device is simple to manufacture and to assemble.
  • the rails 10a-e are attached to the profiled element 9, e.g. by rolling of wires into corresponding slots in the profiled element and the profiled element is inserted into the upper portion 7a, 7b, 7c of the cavity 7.
  • the position sensors 5, 6 are identically alike and are turned with the projections 5a, 6a pointing in opposite directions before they are fitted into the respective portions 7d, 7e and 7d, 7f of the cavity, whereafter the desired positioning takes place by means of the respective rods 11a, 11b and 12, 12b as described above.
  • the position rods may cooperate with the position sensor in any other way, e.g. as indicated in the general part of the description (by means of a screw thread). In such a case, only one position rod is needed to adjust the position of a sensor. Further, a separate cavity may be disposed for each position sensor.
  • the electric connections of the position sensor may likewise be elaborated in any other way, e.g. with flexible cable

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

Device for sensing the position of a piston in a cylinder tube (1). At least one position sensor (6) is displaceably adjustable inside a longitudinal cavity (7) within the wall of the cylinder tube (1). The position sensor (6) is adjustable into a desired position by means of at least one position rod extending from the respective end of the cylinder tube within the cavity (7).

Description

PISTON POSITION SENSING DEVICE
The invention concerns a device for sensing the position of a piston in the inside of a fluid pressure cylinder, of the kind defined in the preamble of claim 1.
Normally, sensing devices of this kind comprise a guide for the position sensor, being situated on the outside of the cylinder tube, e.g. forming a longitudinal bead formed integrally with the cylinder tube or in the form of a tension rod disposed between the end plates of the fluid pressure cylinder. There are also known devices where the sensor is fastened on the outside of the cylinder tube by means of a hose clamp. One advantage with such an outer placing of the position sensor is that it is easily accessible and thus may easily be fastened in any desired position, usually by means of fastener screws. However, a position sensor at the outside is exposed to damages from external mechanical or chemical influences. Likewise, the electrical connections of the sensor are exposed to damage and often have to be protected by covers or the like making an altered positioning of the position sensor more difficult.
The aim of the invention is to achieve a device of the kind stated above, which eliminates the above indicated drawbacks and at the same time facilitates production, mounting and positioning of the position sensor along its guide.
This aim is achieved by the features stated in the characterizing part of claim 1. Thus, the position sensor or sensors are well protected within a cavity in the wall of the cylinder tube, whereas the outside of the cylinder tube may be free from protruding elements. The fastening of the position sensor in a desired axial position along the cavity serving as a guide can be achieved in different ways, e.g. by means of fastening screws through the material of the cylinder tube between the outside and the cavity. Preferably, however, position rods are used, each extending from the respective cylinder tube end to the position sensor as stated in claim 2, said position rods being fastenable in desired
positions by means of locking means. The rod or the rods may cooperate with the associated position sensor by means of a screw thread being engaged to a gear rack on the sensor, the positioning being effected by rotation of the position rod
(in this or similar cases only one position rod is needed to position one sensor), or by the respective position rod being slid from the end of the cylinder tube until its inner end portion abuts the position sensor and the latter is slid to a desired position. Thereafter, the two position rods abutting the position sensor from each side may preferably be fastened by means of the above-mentioned locking means and be cut off at the ends of the cylinder tube. If desired, the position of the sensor may be changed by releasing the locking means, inserting a new rod from one end (so that the sensor is slid correspondingly), cutting off the protruding rods and locking the rods in the new position. Electric connection to the respective position sensor may preferably be accomplished by means of at least one electrically conductive rail, extending within the cavity and interacting with connecting elements on the position sensor, as stated in claims 4-9.
When using two position sensors in the same cavity, each sensor is preferably provided with a projection, protruding into a respective guide channel, for the associated position rod, the two guide channels communicating, with a central portion of the cavity (as stated in claim 10). Alternatively, two or more position sensors may of course be arranged in separate, axial ly extending cavities, one for each sensor. The invention will be explained in greater detail below with reference to the accompanying drawings, which illustrate an example of the invention.
Fig. 1 shows a fluid pressure cylinder in a partly cut sideview with the central portion cut away;
Fig. 2 shows a cross section through the cylinder tube with its cavity;
Fig. 3 shows a cross section through a profiled element with electric connecting wires;
Fig. 4 shows a cross section of the profiled element according to Fig. 3 together with a first position sensor;
Fig. 5 shows correspondingly to Fig. 4 a second position sensor together with the profiled element and the position rods
effective on the two position sensors; and
Fig. 6 shows in a plane view from below the two position
sensors, the profiled element according to Fig. 3 and 4 as well as two pairs of position rods (the central portion is cut away). The fluid pressure cylinder shown in Fig. 1 comprises a cylinder tube 1, within which a not shown piston is slidable between two end plates 2, 3, whereas a piston rod 4, which is connected to the piston, extends through one of the end plates 3. The position of the piston is sensed by means of two position sensors 5, 6, e.g. of magnetoresistive type, which emit a position indicating signal when the piston reaches a certain position relative to the respective sensor.
According to the invention the position sensors 5, 6 are
slidably adjustable in a longitudinal cavity 7 formed in the wall of the cylinder tube. In the shown embodiment this cavity is arranged in the upper part, while further longitudinal channels 8a, 8b, 8c, 8d for the reception of tension rods or fastening screws for the end plates (not shown) are provided at the sides of the cylinder tube.
The cavity 7 comprises an upper portion 7a with guide slots 7b, 7c projecting laterally on both sides, in which upper portion a profiled element 9 of a synthetic material with a number of electrically conductive rails 10a-e is inserted, and a central portion 7d with guide channels 7e, 7f associated laterally thereto on each side. The position sensors 5 and 6 are placed in the central portion 7d of the cavity, one position sensor 5 being provided with a lateral projection 5a, protruding into the guide channel 7e, and the other position sensor 6 being provided with a lateral projection 6a, that protruding into the other guide channel 7f (c.f.Fig. 4, 5 and 6).
Hereby, the two position sensors 5, 6 can be displaced independently by means of its respective pair of position rods 11a, 11b resp. 12a, 12b, being guided in the respective guide channel 7e, 7f. Upon adjusting the two sensors into a respective desired position, the rods 11a, 11b resp. 12a, 12b are locked by means of locking screws 13a, 13b and cut off at the ends of the cylinder tube. If a position sensor is to be displaced hereafter, the associated locking screws are released and a new rod is inserted, whereafter the screws are locked and the protruding rod ends are removed. The position rods, at least one in each pair, may suitably be provided with a longitudinal scale or markings facilitating the determination of the position of the associated sensor.
Each position sensor 5, 6 is supplied with electrical energy through a common conductor rail 10c and a conductor rail 10b and 10d, respectively, while a piston position indicating signal is emitted through an outer signal rail 10a and 10e, respectively. Thus, the position sensor 5 is provided with three contact tongues 14a, 14b, 14c, making contact with the rails 10a, 10b and 10c, whereas the position sensor 6 is provided with contact tongues 15c, 15d, 15e making contact with the respective rails 10c, 10d and 10e. The rails 10a-e are connectd e.g. to a
central unit with a power source and to a signal indicating device or the like, via terminals 16, 17 (Fig. 1) and a cable (not shown).
Obviously, the above described device is simple to manufacture and to assemble. The rails 10a-e are attached to the profiled element 9, e.g. by rolling of wires into corresponding slots in the profiled element and the profiled element is inserted into the upper portion 7a, 7b, 7c of the cavity 7. The position sensors 5, 6 are identically alike and are turned with the projections 5a, 6a pointing in opposite directions before they are fitted into the respective portions 7d, 7e and 7d, 7f of the cavity, whereafter the desired positioning takes place by means of the respective rods 11a, 11b and 12, 12b as described above.
The above-described device may be modified by one skilled in the art within the scope of the following claims. Thus, the position rods may cooperate with the position sensor in any other way, e.g. as indicated in the general part of the description (by means of a screw thread). In such a case, only one position rod is needed to adjust the position of a sensor. Further, a separate cavity may be disposed for each position sensor. The electric connections of the position sensor may likewise be elaborated in any other way, e.g. with flexible cable
connections.

Claims

C L A I M S
1. Device for sensing the position of a piston in a cylinder tube (1) of a fluid pressure cylinder, comprising at least one adjustable position sensor (5,6) displaceable along a guide at the cylinder tube, c h a r a c t e r i z e d in
- that the guide is constituted by at least one longitudinal cavity (7) being formed in the wall of the cylinder tube (1); and
- that said at least one position sensor (5, 6) is
adjustable into a desired position inside the cavity
(7) by means of at least one position rod (11a, 11b,
12a, 12b) extending within the cavity from one end of the cylinder tube to the position sensor.
2. Device according to claim 1, c h a r a c t e r i z e d in that said at least one position sensor (5,6) is adjustable by means of two position rods (11a, 11b, 12a, 12b) each extending from the respective cylinder tube end to the position sensor, said position rods being lockable in desired positions by means of locking means (13a, 13b).
3. Device according to claim 2, c h a r a c t e r i z e d in that said locking means are constituted by locking screws (13a, 13b) in threaded holes being provided in the material between the outside of the cylinder tube (1) and said
longitudinal cavity (7).
4. Device according to any of the claims 1-3, c h a r a c t e r i z e d in that electric connection to said position sensors (5, 6) is achieved by means of at least one electrically conductive rail (10a-e), extending within the cavity (7) and interacting with contact elements (14a, 14b, 14c, 15c, 15d, 15e) on the position sensor (5, 6).
5. Device according to claim 4, c h a r a c t e r i z e d in that said at least one electrically conductive rail (10a-e) is affixed to a profiled element (9) which is inserted into the cavity, said profiled element (9) preferably being manufactured from a synthetic material.
6. Device according to claim 5, c h a r a c t e r i z e d in that said at least one electrically conductive rail is constituted by a conductive wire inserted into a slot in the profiled element (9).
7. Device according to claim 5 or 6, c h a r a c t e r i z e d in that the profiled element (9) and the cavity (7) have
mutually cooperating longitudinal guide means (7b, 7c).
8. Device according to any of the claims 4-7, wherein two position sensors are adjustable within the same cavity (7), c h a r a c t e r i z e d in that each position sensor cooperates with a respective signal conductive rail (10a, 10e).
9. Device according to claim 8, c h a r a c t e r i z e d in that at least one current supplying rail (10c) is common to both of the position sensors (5, 6).
10. Device according to any one of the preceding claims, wherein two position sensors (5,6) are adjustable within the same cavity (7), c h a r a c t e r i z e d in that each position sensor (5, 6) is provided with a projection (5a, 6a) protuding into a respective guide channel (7e, 7f) for the associated position rod (11a, 11b, 12a, 12b), the two guide channels (7c, 7f) communicating with a central portion (7d) of the cavity.
PCT/SE1991/000072 1990-03-28 1991-01-31 Piston position sensing device WO1991014871A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9001134-7 1990-03-28
SE9001134A SE465890B (en) 1990-03-28 1990-03-28 KOLVLAEGESAVKAENNARE

Publications (1)

Publication Number Publication Date
WO1991014871A1 true WO1991014871A1 (en) 1991-10-03

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ID=20379023

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000072 WO1991014871A1 (en) 1990-03-28 1991-01-31 Piston position sensing device

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SE (1) SE465890B (en)
WO (1) WO1991014871A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4408639A1 (en) * 1994-03-09 1995-09-14 Mannesmann Ag Working cylinder with a cylinder housing profile
EP0713980A3 (en) * 1994-10-26 1997-03-26 Festo Kg A driving device
EP0985831A2 (en) 1998-09-09 2000-03-15 Festo AG & Co Linear drive
EP2051352A1 (en) * 2007-08-29 2009-04-22 Festo AG & Co. KG Electric linear drive device
FR2994128A1 (en) * 2012-08-02 2014-02-07 Peugeot Citroen Automobiles Sa Shock absorber assembly for vehicle i.e. car, has part forming body of shock absorber, and cylindrical opening formed in body of shock absorber, where opening is matched with rib and connection parts are positioned in extension of rib

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230023A (en) * 1977-12-05 1980-10-28 Scovill Manufacturing Company Clamping apparatus
DE3516346C1 (en) * 1985-05-07 1986-04-30 Daimler-Benz Ag, 7000 Stuttgart Clamping device for fastening a position sensor to the tie rod of a pressure-medium cylinder
GB2195711A (en) * 1986-10-07 1988-04-13 Festo Kg Piston and cylinder assembly with a position indicator
US4793241A (en) * 1986-11-13 1988-12-27 C K D Kabushiki Kaisha Piston position detector for fluid pressure cylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230023A (en) * 1977-12-05 1980-10-28 Scovill Manufacturing Company Clamping apparatus
DE3516346C1 (en) * 1985-05-07 1986-04-30 Daimler-Benz Ag, 7000 Stuttgart Clamping device for fastening a position sensor to the tie rod of a pressure-medium cylinder
GB2195711A (en) * 1986-10-07 1988-04-13 Festo Kg Piston and cylinder assembly with a position indicator
US4793241A (en) * 1986-11-13 1988-12-27 C K D Kabushiki Kaisha Piston position detector for fluid pressure cylinder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4408639A1 (en) * 1994-03-09 1995-09-14 Mannesmann Ag Working cylinder with a cylinder housing profile
DE4408639C2 (en) * 1994-03-09 1998-04-16 Mannesmann Ag Working cylinder with a cylinder housing profile
EP0713980A3 (en) * 1994-10-26 1997-03-26 Festo Kg A driving device
EP0985831A2 (en) 1998-09-09 2000-03-15 Festo AG & Co Linear drive
EP0985831A3 (en) * 1998-09-09 2000-09-13 Festo AG & Co Linear drive
EP2051352A1 (en) * 2007-08-29 2009-04-22 Festo AG & Co. KG Electric linear drive device
US7973435B2 (en) 2007-08-29 2011-07-05 Festo Ag & Co. Kg Electrical linear drive
RU2473162C2 (en) * 2007-08-29 2013-01-20 ФЕСТО АГ унд Ко.КГ Electric linear driving device
FR2994128A1 (en) * 2012-08-02 2014-02-07 Peugeot Citroen Automobiles Sa Shock absorber assembly for vehicle i.e. car, has part forming body of shock absorber, and cylindrical opening formed in body of shock absorber, where opening is matched with rib and connection parts are positioned in extension of rib

Also Published As

Publication number Publication date
SE9001134D0 (en) 1990-03-28
SE9001134L (en) 1991-09-29
SE465890B (en) 1991-11-11

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