EP1798422B1 - Dispositif de capteur pour un dispositif piston-cylindre - Google Patents

Dispositif de capteur pour un dispositif piston-cylindre Download PDF

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Publication number
EP1798422B1
EP1798422B1 EP06024877A EP06024877A EP1798422B1 EP 1798422 B1 EP1798422 B1 EP 1798422B1 EP 06024877 A EP06024877 A EP 06024877A EP 06024877 A EP06024877 A EP 06024877A EP 1798422 B1 EP1798422 B1 EP 1798422B1
Authority
EP
European Patent Office
Prior art keywords
piston
sensor device
cylinder unit
unit according
housing
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.)
Not-in-force
Application number
EP06024877A
Other languages
German (de)
English (en)
Other versions
EP1798422A3 (fr
EP1798422A2 (fr
Inventor
Thomas Nowotka
Jürgen Lindenthal
Alfred Memmel
Achim Thomä
Alfred Wirth
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP1798422A2 publication Critical patent/EP1798422A2/fr
Publication of EP1798422A3 publication Critical patent/EP1798422A3/fr
Application granted granted Critical
Publication of EP1798422B1 publication Critical patent/EP1798422B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means

Definitions

  • the invention relates to a sensor device for a piston-cylinder unit according to the preamble of patent claim 1.
  • a sensor device which is arranged in a receiving opening of the cylinder.
  • the sensor device comprises an axially movable sensor, which is biased by a spring on the surface of a piston rod.
  • a cover closes the bore in the cylinder and acts as a support surface for the spring. In the cover a passage opening for a cable harness to the sensor is executed.
  • a piston-cylinder unit in the design of a vibration damper is often filled via the open end of the cylinder with damping medium.
  • the piston is introduced into the cylinder together with the piston rod, thereby brushing the sensor, the u. U. can even clamp on the piston.
  • a vibration damper which has an end cap on an end face of a cylinder in which a sensor device in the form of magnetic field sensors is injected together with electronic circuits.
  • a basic requirement in the use of magnetic field sensors is that the distance of a sensor as exactly as possible to the measuring surface, in this case the piston rod, must be complied with so that usable signals are present. At least in theory, this requirement can be fulfilled with a spraying method, but then it has to be accepted that, in the event of a defect or an impermissible signal deviation of the sensor, both the sensor and the end cap can no longer be used and thus represent a cost factor.
  • EP 0 894 983 A2 describes a sensor that is clamped on a cylinder. This purpose is a clamp-like housing that engages around the cylinder. Clamping screws in the housing then provide the holding forces.
  • the sensor is arranged parallel to the piston rod extending groove.
  • the EP 1 544 476 A2 discloses a housing for a sensor, wherein the sensor is aligned radially in the direction of the piston rod. An adjusting device is not recognizable.
  • Object of the present invention is to realize a sensor device for a piston-cylinder unit, in which on the one hand a defined position of a
  • the big advantage is that the sensor device is not in contact with the working spaces of the piston-cylinder unit. Consequently, no sealing measures must be taken. Furthermore, there is a larger space for the readjustment movement of the sensor device.
  • the rotary joint is designed on the outer edge side of the housing. This makes the swivel joint easily accessible during assembly.
  • pivoting movement is supported by a spring. Due to the lever ratios to the swivel joint, a sufficiently large adjusting force can be achieved with a very weak spring.
  • the housing has a support surface for the spring, so that additional components can be omitted.
  • the spring is designed as a leaf spring. With regard to a small spring force, the leaf spring is wave-shaped. A leaf spring offers the additional advantage that the support surface can be formed by a groove.
  • a particularly compact unit is achieved in that the sensor device has a carrier which is designed in one piece with the spring.
  • the carrier consists of a plastic, so that any spring shapes can be produced.
  • the housing may carry an elastomeric body which acts as a spring on the sensor device.
  • a housing-side bearing part has a longitudinal slot for radial mounting movement of a bearing part of the sensor device, wherein the bearing part is mounted on at least one lateral flattening in a defined mounting position in the housing side bearing part.
  • the sensor device comprises not only the sensor itself, but also a signal processing unit.
  • the sensor device has a printed circuit board with a section angled in the direction of the surface of the piston rod, on which the sensor is arranged.
  • the sensor device is a comparatively expensive component. So that no special protective measures, eg. B. when painting the piston Cylinder unit are necessary, the housing is made radially divisible and can therefore be attached at the end of the assembly.
  • the sensor device should not only maintain its radial position but also its axial position during a piston rod movement. Therefore, the housing-side bearing part has an axial securing device for the sensor device.
  • a holder for a train protection is attached to the cylinder of the piston-cylinder unit.
  • the bearing part of the sensor device has a cable guide for a cable set of the sensor device.
  • FIG. 1 shows an upper part of a piston-cylinder unit in the design of a known per se vibration damper 1 of any design.
  • a piston rod 5 is guided axially displaceable and via a connecting joint 7 z. B. attached to a vehicle body or a vehicle cabin.
  • the vibration damper 1 has a pressure stop spring 9 in the form of an elastomer body, which comes from a defined retraction position of the piston rod on an end face 47 of an end cap 11 to the plant.
  • the one-piece end cap 11 as an outer-side housing on the cylinder 3 includes a sensor device 13, which controls the movement of the piston rod, for. B. stroke position or piston rod speed detected.
  • a segment-like receiving opening 15 is executed, which extends radially to a through hole 53 for the piston rod 5.
  • the sensor device includes, inter alia, a carrier 17 for a board 19 and a cable set 21, which has a sleeve 23 with Has transverse webs, which engages in a cylinder-side bracket 25, are supported on the front side and thus form a train protection for the harness.
  • the receiving opening 15 of the housing has at the outer edge of a bearing part 27 with a longitudinal slot 29.
  • a bearing member 31 At the sensor device 13 is a bearing member 31 with two lateral flats 33 available. The distance of the lateral flattening is at most as large as the slit width of the longitudinal slot 29, so that the sensor device can be mounted with a radial assembly movement into the housing-side bearing part 27.
  • the housing-side bearing part 27 and the bearing part 31 of the sensor device 13 form a pivot 35 (FIG. Fig. 3 ), via which the sensor device can perform a pivoting movement in the direction of the piston rod 5.
  • a cable guide 34 of the cable set 21 is executed ( Fig. 2 ).
  • FIGS. 2 and 3 shows the cut end cap 11 and the housing with the receiving opening 15.
  • a spring 37 which is formed in this embodiment as a wave-shaped leaf spring.
  • the spring 37 is supported at the end on a support surface of a groove 39 on the housing 11.
  • the carrier 17 is made of a plastic which may be made in one piece with the spring 37.
  • a sensor 41 is arranged on an angled in the direction of the piston rod 5 section 43 of the circuit board 19, so that no cable connections are necessary between the sensor and the board.
  • the two flats 33 are aligned in the direction of the longitudinal slot 29 of the bearing part 27 ( Fig.1 ).
  • the bearing part 31 of the sensor device in the bearing part 27 has reached the middle position, the sensor device 13 is given away into the receiving opening 15 until the sensor 41 rests against the piston rod 5.
  • the pivot 35 is locked against a radial force.
  • the spring 37 is axially tensioned and then inserted with its outwardly facing end in the lateral groove 39 of the receiving opening.
  • the sensor device 13 is not loaded by the stop buffer 9, since radially and in the circumferential direction extending webs 45 for a power flow from the end face 47 (FIG. Fig. 1 ) of the end cap 11 on the cylinder 3 provide.
  • the Fig. 4 shows a piston-cylinder unit 1, which is constructed very similar, as already to Fig. 1 is described. Notwithstanding, there is no stop buffer 9, so that the sensor device 13 is accessible on the front side of the housing 11. In addition, in the Fig. 4 a protective tube 49 with a pictorial eruption for better representation of the sensor device 13 located.
  • the main difference to the Fig. 1 to 3 is that the housing 11 radially into two segments 11 a; 11b is divisible executed.
  • a dividing joint 51 extends from the outer edge to the passage opening 53 for the piston rod 5.
  • Fig. 5 is the housing 11 with its segments 11 a; 11 b shown in a separate position.
  • segment 11a On the segment 11a are T-shaped, axially extending webs 55th executed, which can be inserted into T-shaped grooves 57 of the segment 11 b and thus firmly connect the segments to each other to the housing 11.
  • the structure of the carrier 17 with the board 19 corresponds to the Fig. 2 .
  • the pivot bearing 27 has an annular web 59, on the end face 61 of the carrier 17 comes in the final assembly position to the plant.
  • a second annular web 63 As a further support surface is a second annular web 63, which is designed concentrically to the pivot bearing 27 at a radial distance.
  • the housing 11 has a cylindrical bearing body 65 which serves as a bearing for an elastic transmission element 67, in accordance with the assembly position Fig. 6 comes to rest on the lateral edge of the carrier 17 and a spring force on the sensor device 13 transmits, so that they pivot about the pivot bearing 35, formed by the bearing parts 27; 31, can perform.
  • An angular web 69 represents an axial securing device for the sensor device 13.
  • the board 19 is protected by a potting compound, not shown, as it is often used in electrical engineering.
  • the variant after the 4 to 6 has the advantage that the housing can still be mounted even if the connection joint 7 is already connected to the piston rod 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Claims (15)

  1. Unité cylindre-piston (1), comprenant un cylindre (3), dans lequel une tige de piston (5) est guidée de manière déplaçable axialement, avec un dispositif de capteur (13) qui détecte le comportement de déplacement de la tige de piston (5), le dispositif de capteur (13) étant disposé dans un logement (15) et pouvant effectuer un mouvement de réglage dans la direction de la surface de la tige de piston, le logement (15) pour le dispositif de capteur (13) faisant partie d'un boîtier (11) fixé à l'extérieur du cylindre (3) ,
    caractérisée en ce que
    le dispositif de capteur (13) est monté dans le boîtier (11) par le biais d'une articulation pivotante (35) et effectue autour de cette articulation pivotante (35) un mouvement de pivotement dans la direction de la surface de la tige de piston (5).
  2. Unité cylindre-piston selon la revendication 1,
    caractérisée en ce que
    l'articulation pivotante (35) est réalisée du côté du bord extérieur sur le boîtier (11).
  3. Unité cylindre-piston selon la revendication 1,
    caractérisée en ce que
    le mouvement de pivotement est supporté par un ressort (37 ; 67) .
  4. Unité cylindre-piston selon la revendication 3,
    caractérisée en ce que
    le boîtier (11) présente une surface de support pour le ressort (37).
  5. Unité cylindre-piston selon la revendication 3,
    caractérisée en ce que
    le ressort (37) est réalisé sous forme de ressort à lame.
  6. Unité cylindre-piston selon la revendication 4,
    caractérisée en ce que
    la surface de support est formée par une rainure (39) .
  7. Unité cylindre-piston selon la revendication 3,
    caractérisée en ce que
    le dispositif de capteur (13) présente un support (17) qui est réalisé d'une seule pièce avec le ressort (39).
  8. Unité cylindre-piston selon la revendication 7,
    caractérisée en ce que
    le support (17) se compose de plastique.
  9. Unité cylindre-piston selon la revendication 3,
    caractérisée en ce que
    le boîtier (11) porte un corps en élastomère (67), qui agit en tant que ressort (39) sur le dispositif de capteur (13).
  10. Unité cylindre-piston selon la revendication 1,
    caractérisée en ce
    qu'une partie de palier (27) du côté du boîtier présente une fente longitudinale (29) pour le mouvement de montage radial d'une partie de palier (31) du dispositif de capteur (13), la partie de palier (31) pouvant être montée dans une position de montage définie dans la partie de palier (27) du côté du boîtier par le biais d'au moins un méplat latéral (33).
  11. Unité cylindre-piston selon la revendication 1,
    caractérisée en ce que
    le dispositif de capteur (13) présente une platine (19) avec une portion (43) coudée dans la direction de la surface de la tige de piston (5), sur laquelle est disposé le capteur (41).
  12. Unité cylindre-piston selon la revendication 1,
    caractérisée en ce que
    le boîtier (11a ; 11b) est réalisé de manière à pouvoir être divisé radialement.
  13. Unité cylindre-piston selon la revendication 10,
    caractérisée en ce que
    la partie de palier (27) du côté du boîtier présente une fixation axiale (69) pour le dispositif de capteur (13).
  14. Unité cylindre-piston selon la revendication 1,
    caractérisée en ce
    qu'une fixation (25) pour une protection contre la traction d'un jeu de câbles (21) du dispositif de capteur (13) est fixée sur le cylindre (3) de l'unité cylindre-piston (1).
  15. Unité cylindre-piston selon la revendication 10,
    caractérisée en ce que
    la partie de palier (31) du dispositif de capteur (13) présente un guide-câble pour un jeu de câbles (21) du dispositif de capteur (13).
EP06024877A 2005-12-13 2006-12-01 Dispositif de capteur pour un dispositif piston-cylindre Not-in-force EP1798422B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005059984A DE102005059984A1 (de) 2005-12-13 2005-12-13 Sensoreinrichtung für ein Kolben-Zylinderaggregat

Publications (3)

Publication Number Publication Date
EP1798422A2 EP1798422A2 (fr) 2007-06-20
EP1798422A3 EP1798422A3 (fr) 2009-08-12
EP1798422B1 true EP1798422B1 (fr) 2011-10-26

Family

ID=37864507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06024877A Not-in-force EP1798422B1 (fr) 2005-12-13 2006-12-01 Dispositif de capteur pour un dispositif piston-cylindre

Country Status (3)

Country Link
EP (1) EP1798422B1 (fr)
AT (1) ATE530775T1 (fr)
DE (1) DE102005059984A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114323447B (zh) * 2022-03-10 2022-05-27 浙江华朔科技股份有限公司 一种用于铝合金壳体的密封性检测封堵工装

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839591A (en) 1986-12-16 1989-06-13 Kayaba Kogyo Kabushiki-Kaisha Magnetic stroke sensor for detecting the stroke of a fluid-power cylinder
JPH1151011A (ja) * 1997-07-30 1999-02-23 Smc Corp 流体圧シリンダにおける位置検出センサ取付具
DE20106298U1 (de) * 2001-04-10 2001-06-21 FESTO AG & Co., 73734 Esslingen Linearantrieb
JP2005531736A (ja) 2002-07-02 2005-10-20 コンティネンタル・テーベス・アクチエンゲゼルシヤフト・ウント・コンパニー・オッフェネ・ハンデルスゲゼルシヤフト ショックアブソーバ並びにショックアブソーバ運動を検出する装置
DE20211518U1 (de) * 2002-07-13 2002-09-12 FESTO AG & Co., 73734 Esslingen Als Hall-Sensor ausgebildeter Positionssensor
DE10242266A1 (de) * 2002-09-12 2004-03-25 Continental Teves Ag & Co. Ohg In einen Hauptzylinder integrierter Signalgeber Magneto-Widerstand
US7162947B2 (en) * 2003-12-19 2007-01-16 Caterpillar Inc Mount for cylinder position sensor

Also Published As

Publication number Publication date
EP1798422A3 (fr) 2009-08-12
ATE530775T1 (de) 2011-11-15
EP1798422A2 (fr) 2007-06-20
DE102005059984A1 (de) 2007-06-14

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