EP1866547B1 - Vorrichtung zur einstellung des kolbenhubs an einem druckmittelaktivierten kolben-zylinder-mittel - Google Patents

Vorrichtung zur einstellung des kolbenhubs an einem druckmittelaktivierten kolben-zylinder-mittel Download PDF

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Publication number
EP1866547B1
EP1866547B1 EP06717011.8A EP06717011A EP1866547B1 EP 1866547 B1 EP1866547 B1 EP 1866547B1 EP 06717011 A EP06717011 A EP 06717011A EP 1866547 B1 EP1866547 B1 EP 1866547B1
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EP
European Patent Office
Prior art keywords
piston
junction
cylinder
arrangement according
stop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP06717011.8A
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English (en)
French (fr)
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EP1866547A4 (de
EP1866547A1 (de
Inventor
Mats Eklund
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Wipro Infrastructure Engineering AB
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Wipro Infrastructure Engineering AB
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Application filed by Wipro Infrastructure Engineering AB filed Critical Wipro Infrastructure Engineering AB
Priority to PL06717011T priority Critical patent/PL1866547T3/pl
Publication of EP1866547A1 publication Critical patent/EP1866547A1/de
Publication of EP1866547A4 publication Critical patent/EP1866547A4/de
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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
    • F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke

Definitions

  • the present invention concerns a device for adjusting the piston stroke of a pressure medium-activated piston-cylinder means as specified by the introduction to claim 1.
  • Pressure medium-activated piston-cylinder means are often constructed with a cylinder housing with a closed end part and an end part provided with a cylinder head provided with an opening through which a piston rod protrudes.
  • the piston rod is attached to a piston provided with sealing rings, which piston can be displaced between an inner end location where the piston is located in association with the closed end of the cylinder housing, and an outer end location where the position is located in association with the cylinder head.
  • the cylinder housing is provided with connections in the form of at least one inlet and one outlet for the passage of a pressure medium into and out from the cylinder housing.
  • the inlet and the outlet are preferably located in association with the end parts of the cylinder housing.
  • the closed end part of the cylinder housing normally demonstrates an attachment in the form of an attachment point mounted in bearings or provided with a bush, intended to constitute one attachment.
  • the piston rod further demonstrates a second attachment point mounted in bearings or provided with a bush at its free end, intended to constitute the second attachment point.
  • the cylinder housing is divided by the piston, which is located between the connections, into a pressurised side and a return side.
  • the pressurised medium is led into the connection of the pressurised side, which is normally that side that is located closest to the closed end part, the piston is displaced, accompanied by the piston rod, in the direction towards the cylinder head with the piston rod protruding out through the cylinder head, whereby the piston and the piston rod execute the pressure stroke and adopt their extended outer end location.
  • the medium that is present on the second side of the piston i.e. in the return side of the cylinder housing, is led away out through the outlet connection.
  • the pressurised medium is led in through the return connection and presses the piston in the direction towards the closed end of the cylinder housing.
  • the medium that is located on the second side of the piston is thus led away out through the inlet connection.
  • hydraulic cylinders are in general constructed according to the principle described above, there are few opportunities for adjusting the piston stroke, i.e. the distance between its attachment points, since it is intended that the piston be displaced between its end points.
  • the piston stroke of the cylinder must be carefully adjusted since the attachment of the attachment points may demonstrate variations that deviate from the intended dimension.
  • the present invention aids in simplifying this careful adjustment.
  • One method of adjusting the distance is to displace the attachments on the equipment that it is intended that the hydraulic cylinder is to control, but this change cannot be carefully adjusted when the components that comprise the device are worn, with the subsequent changes in the distance between the attachment points.
  • FR 2 231 873 A1 discloses another arrangement for setting the piston stroke.
  • pressurised medium may be here used to denote hydraulic oil that has been placed under pressure by a hydraulic oil pump and that is led through pipes or tubes to the cylinder through a valve, or to denote pressurised air that has been generated by a compressor. Other types of medium are also possible.
  • Pressure medium-activated piston-cylinder means are currently used within a large number of different areas, for example the operating tools of loading machines in which precision with respect to the piston stroke, i.e. the distance between its end positions, is not of critical significance.
  • Other areas of use involve the said precision of the end positions having great significance, one example of this is the tail lifts of lorries or busses.
  • a tail lift is used not only to lift a load from the ground level up to the level of the loading floor of the vehicle with the rear wall essentially horizontal, but also to enclose the loading space of the vehicle with the rear wall in an essentially vertical position.
  • the tail lift normally comprises an end wall for a loading volume, which end wall is hinged at the lower edge of the loading volume.
  • a lift arrangement is arranged with which the tail wall can be lowered and raised between the ground level and the level of the loading floor.
  • the tail lift is used as follows: the tail wall in its horizontal position is first raised to the level of the loading floor with the aid of the lift arrangement. The lifting motion ceases when the tail wall reaches the level of the loading floor. The tail wall is subsequently rotated around the hinged edge with the aid of one or several piston-cylinder means arranged between the loading floor and jointed control arms that are arranged at the tail wall. When the piston rod of the piston-cylinder means is pressed out towards its outer end position, the tail wall is rotated around its joints towards the vertical position. When the piston-cylinder means reaches its outer end position, the tail wall is pressed against the edges of the loading volume, and this loading volume is closed. If the piston stroke, i.e.
  • the distance between the cylinder head and the outer end position of the piston rod, of the piston-cylinder means is too long, this means that the tail wall will press too hard against the edges of the loading volume, whereby the edges of the loading volume may be damaged.
  • One of the attachments of the piston-cylinder means must be displaced if this occurs, something that requires a great deal of work. Furthermore, such a displacement of the attachment point entails a change in the lowered position of the tail wall, and further adjustment is required for this reason. Furthermore, the arrangement requires subsequent adjustments as the attachments and fittings become worn.
  • One aim of the present invention is to provide an arrangement that solves these shortcomings.
  • the pressure medium-activated piston-cylinder means shown in Figure 1 is of the type that is activated by a pressurised hydraulic oil, and the term "hydraulic cylinder" will for this reason be used in the following text, with reference number 1. It should, however, be realised that the adjustment arrangement can be used for piston-cylinder means that are activated by other types of pressure medium.
  • the hydraulic cylinder 1 comprises a cylinder housing 2 with a first end 3 that is closed by, for example, an end wall in the form of a cap 4 that has been welded onto it or that permanently seals the end of the cylinder housing 2 by another method.
  • the cylinder housing 2 comprises a second end 5 provided with an end wall in the form of a cylinder head 6 demonstrating an opening 7 equipped with seals and essentially centred in the cylinder head 6.
  • Connections 8, 9 for the passage of a flow of the activating medium are arranged in association with the ends 3, 5 of the cylinder housing 2.
  • the cylinder housing 2 is divided into a pressurised side 10 and a return side 11 by a piston (not shown in the drawings) to which a piston rod 12 that extends out through the opening 7 in the cylinder head 6 is attached.
  • the return side 11 is normally also termed the "piston rod side" since the return flow is pressed out from the cylinder housing 2 through the connection 8 by the piston when this moves in the direction towards the cylinder head 6.
  • the piston rod 12 is composed of two parts, the first one 13 of which is attached to the piston (not shown).
  • the end of the first part 13 that is directed towards the piston (not shown) is provided with threads that fit a threaded hole in the piston.
  • a guide 15 in the form of a drilled hole whose central axis coincides with the longitudinal axis of the piston rod 12 is arranged at the free end 14 of the first part 13, i.e. the end that is directed out through the cylinder head 6.
  • a groove 16 in the first part 13 has been created for a locking ring 17 by lathing or by another method, the role of which locking ring will be described below.
  • the piston executes its stroke from one end 3 of the cylinder housing 2 to the second end 5, with a length that is determined by the distance between the end walls 4, 6 of the cylinder housing 2.
  • a junction 18 having the form of a sheath is arranged in association with the cylinder head 6, which junction has the form of a length-adjustment sheath, a stop 19 with the form of a sheath, and a locking nut 20.
  • the first part 13 of the piston rod 12 is extended with an extended second part 21, the extension of whose longitudinal axis coincides with the longitudinal axis of the first part 13.
  • the second part 21 is provided with grooves 22 with the form of a screw with threads at one 23 of its ends, which second part is located with this end in contact with the free end 14 of the first part 13. Furthermore, the end of the second part 21 that is directed towards the free end 14 of the first part 13 is provided with a section having a somewhat smaller diameter that forms a peg 24 that fits into the guide 15 in the end of the first part 13, and that is taken up into the guide 15 by sliding.
  • This arrangement means that the total length of the piston rod 12, i.e. the total length of the first part 13 and the second part 21, can be increased by withdrawing the peg 24 a certain amount from the guide 15, without drawing it out completely.
  • the second part 21 is provided at its free end 23 with a mounting head 25 mounted in bearings or on bushes, intended to be mounted into the unit that is to be controlled, in this example this is the rear wall of a tail lift (not shown).
  • a mounting head 25 mounted in bearings or on bushes, intended to be mounted into the unit that is to be controlled, in this example this is the rear wall of a tail lift (not shown).
  • the junction comprises, as is shown in Figure 2 , a sheath with an outer spanner grip 26 at one of its ends and it is further provided with inner 27 and outer 28 grooves having the shape of screws and in the form of threads. It is intended that the inner threads 27 interact with the threads of the second part 21 and they extend into the junction 18 to be terminated with a groove 29 for the locking ring 17 corresponding to the groove 16 in the first part 13. It is intended that the locking ring 17 locks the axial displacement of the junction 18 at the first part 13 but allows the junction 18 to rotate at the first part 13. It is intended that the outer threads 28 interact with the stop 19, and extend from the end of the junction 18 that is opposite to the end that has the spanner grip 26.
  • the stop 19 comprises, as can be seen in Figure 2 , a sheath that has grooves 30 having the form of screws and in the form of threads at its inner surface intended to interact with the outer threads 28 of the junction 18 when this is screwed into the stop 19.
  • the stop 19 has been given an inner diameter that corresponds to the outer diameter of the junction 18, and it is an advantage if the outer diameter that it has been given is less than the diameter of the cylinder housing 2. It is intended that the stop 19 make contact with its contact surface 32 against the cylinder head 6 when the piston (not shown) is located at its inner end position. Furthermore, the stop is provided with a stop screw 31 for locking the rotation of the stop 19 around the junction 18.
  • the locking nut 20 is arranged at the second part 21 of the piston rod 12, and it locks the junction 18 to the second part 21 in a known manner by the nut 20 and the junction 18 being screwed in a direction towards each other.
  • a locking screw 33 can also be arranged at the locking nut 20. The purpose of the locking screw 33 is to lock further the rotation of the nut 20 around the second part 21 in such a manner that the locking screw 33 is directed radially inwards from the outer surface of the nut 20 through the body thickness of the nut and onto the second part 21. Thus the nut 20 is prevented from rotating around the second part 21 when the locking screw 33 is tightened.
  • the parts that constitute the stroke adjustment arrangement are arranged in a second embodiment such that the junction 18 surrounds the stop 19 with the form of a sheath in a manner that allows rotation.
  • the function of the stroke adjustment arrangement is as follows: when the end position for the piston stroke is to be adjusted, i.e. the total length of the first part 13 and the second part 21, the piston (not shown) is placed at its outer end position directed towards the cylinder head 6 accompanied by the first part 13, the second part 21 and the parts that are included in the adjustment arrangement. Initially, both the stop 19 and the junction 18 can be placed in contact with the cylinder head 6 when the piston is located at its inner end position. If the piston stroke is too small, the locking nut 20 is loosened, after which the second part 21 is threaded outwards in the direction away from the first part 13, or the junction 18 is threaded outwards away from the stop 19, until the correct piston stroke is achieved.
  • first part 13 that is part of the piston rod 12 and the second part 21 is in this way adjusted continuously with the peg 15 of the second part 21 located in the guide 24 in the first part 13 but withdrawn somewhat from the guide, i.e. the total length of the piston rod 12 is increased.
  • a spanner (not shown) is placed against the spanner grip 26 of the junction and rotated, with the locking screw 31 at the stop 19 in its withdrawn position.
  • the piston stroke obtained is subsequently locked through the rotation of the junction 18 around the second part 21 being locked through the locking nut 20 being tightened against the junction 18 using a spanner (not shown) designed for this purpose and the locking screw 33 of the nut 20 being tightened against the second part 21.
  • the inner end position of the hydraulic cylinder i.e. the shortest distance between the attachments of the hydraulic cylinder
  • the piston is moved to its inner end position in order to adjust this second end position.
  • the stop 19 is turned using a suitable spanner (not shown) with its contact surface 32 making contact with the cylinder head 6.
  • the first part 13 that is part of the piston rod 12 is drawn by this turning operation outwards from its inner end position accompanied by the piston since the stop 19 is placed in contact with the cylinder head 6 and the threads 30 inside the stop 19 interact with the external threads 28 on the junction 18, whereby the distance between the attachments increases.
  • the locking ring 17 locks the displacement of the junction 18 in the longitudinal direction of the piston rod 12 while allowing the junction 18 to rotate around the first part 13, the first part 13 is drawn continuously outwards while the stop 19 lies simultaneously in contact with the cylinder head 6. The rotation continues until the correct distance has been achieved, and when this position has been reached the locking screw 31 is tightened whereby the stop 19 is locked to the junction 18.
  • groove with the form of a screw can be used to denote also a groove with a steep rise in which a rider runs.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Claims (9)

  1. Vorrichtung zur Einstellung des Kolbenhubs an einem druckmittelaktivierten Kolben-Zylinder-Mittel (1), umfassend einen Zylinder (2), in welchem eine verlängerte Kolbenstange (12) angeordnet ist, deren eines Ende sich durch eine Öffnung (7) hindurch in eine Stirnwand (6) erstreckt, welche einen Teil des Zylinders darstellt, und an deren zweitem Ende ein Kolben befestigt ist, wobei die Kolbenstange (12) unter Beaufschlagung des Kolbens zwischen einer inneren und einer äußeren Endstellung verschieblich ist, wobei die Kolbenstange (12) ein erstes Teil (13) und ein zweites Teil (21), von denen eines in dem anderen derart aufgenommen ist, dass ein Gleiten ermöglicht wird, und eine mit einem Schlitz (27) versehene, in Form einer Schraube ausgebildete Verbindungsstelle (18) umfasst, welche Verbindungsstelle relativ zu den beiden Teilen (13, 21) drehbar ist, aber relativ zu einem der Teile nicht axial verschieblich ist, wobei der Ausmaß, zu welchem ein Teil in dem anderen Teil aufgenommen ist, durch drehendes Zusammenwirken mit der Verbindungsstelle (18) bestimmt werden kann, dadurch gekennzeichnet, dass das erste Teil (13) durch drehendes Zusammenwirken zwischen der Verbindungsstelle (18) und einem Anschlag (19) mit der Form einer Hülse relativ zur Stirnwand (6) des Zylinders axial einstellbar ist, welche Hülse mit einem Schlitz (30) mit der Form einer Schraube versehen ist, welcher Anschlag in der inneren Endstellung des Kolbens mit der Stirnwand (6) des Zylinders in Berührung gelangt.
  2. Vorrichtung nach Anspruch 1, wobei der Schlitz (27, 28) mit der Form einer Schraube Gewinde umfasst, welche in der Außenfläche und in der Innenfläche der Verbindungsstelle (18) aufgenommen sind, welche Innengewinde (27) mit in dem zweiten Teil (21) aufgenommenen Gewinden (22) zusammenwirken.
  3. Vorrichtung nach Anspruch 2, wobei der Schlitz (30) des Anschlags (19), welche die Form einer Schraube aufweist, Gewinde umfasst, welche in ihrer Innenfläche aufgenommen sind, wobei sie mit Außengewinden (28) der Verbindungsstelle (18) zusammenwirken.
  4. Vorrichtung nach Anspruch 2, wobei eine selbstsichernde Mutter (20) für das zweite Teil (21) vorgesehen ist, welche die Verbindungsstelle (18) mit dem zweiten Teil (21) verriegelt.
  5. Vorrichtung nach Anspruch 4, wobei die selbstsichernde Mutter mit einer Verriegelungsschraube (33) versehen ist, welche das Drehen der Mutter um das zweite Teil herum verhindert.
  6. Vorrichtung nach einem der vorgehenden Ansprüche, wobei eine Verriegelungsschraube (31) für den Anschlag (19) vorgesehen ist, welche den Anschlag mit der Verbindungsstelle (18) verriegelt.
  7. Vorrichtung nach einem der vorgehenden Ansprüche, wobei die Teile (13, 21) der Kolbenstange (12) eine Führung und einen Dübel (15, 24) umfassen.
  8. Vorrichtung nach einem der vorgehenden Ansprüche, wobei eine Sicherungsring (17) in einem Schlitz (16, 29) montiert ist, welcher in dem ersten Teil (13) oder in der Verbindungsstelle (18) aufgenommen ist, um welche Sicherungsring herum die Verbindungsstelle drehbar ist.
  9. Verwendung einer Vorrichtung nach einem der Ansprüche 1 bis 8 an einem mit einer Ladebordwand versehenen Fahrzeug.
EP06717011.8A 2005-03-18 2006-03-14 Vorrichtung zur einstellung des kolbenhubs an einem druckmittelaktivierten kolben-zylinder-mittel Expired - Lifetime EP1866547B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06717011T PL1866547T3 (pl) 2005-03-18 2006-03-14 Urządzenie do regulowania suwu tłoka w układach tłokowo-cylindrowych uruchamianych ośrodkiem ciśnieniowym

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0500628A SE528417C8 (sv) 2005-03-18 2005-03-18 Anordning för justering av slaglängden hos ett tryckmediumaktiverat kolvsylinerorgan
PCT/SE2006/000326 WO2006098682A1 (en) 2005-03-18 2006-03-14 Device for adjusting the piston stroke at a pressure medium-activated piston-cylinder means

Publications (3)

Publication Number Publication Date
EP1866547A1 EP1866547A1 (de) 2007-12-19
EP1866547A4 EP1866547A4 (de) 2012-05-30
EP1866547B1 true EP1866547B1 (de) 2013-06-19

Family

ID=36991968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06717011.8A Expired - Lifetime EP1866547B1 (de) 2005-03-18 2006-03-14 Vorrichtung zur einstellung des kolbenhubs an einem druckmittelaktivierten kolben-zylinder-mittel

Country Status (5)

Country Link
EP (1) EP1866547B1 (de)
DK (1) DK1866547T3 (de)
PL (1) PL1866547T3 (de)
SE (1) SE528417C8 (de)
WO (1) WO2006098682A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102588380B (zh) * 2012-03-26 2015-11-25 徐州重型机械有限公司 一种液压油缸
IT202200001004A1 (it) * 2022-01-21 2023-07-21 A D R S P A Dispositivo di regolazione angolo massimo di sterzata

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736294A (en) * 1951-08-09 1956-02-28 Smith Corp A O Adjustable stroke ram and piston assembly
US3815480A (en) * 1969-11-17 1974-06-11 R Spyra Variable stroke cylinder
FR2201409B1 (de) * 1972-09-25 1976-01-23 Nouri Jacques Fr
FR2220699B1 (de) * 1973-03-09 1978-03-10 Commissariat Energie Atomique
FR2231873A1 (en) * 1973-06-04 1974-12-27 Perrier & Ses Fils Jack with two-way adjustable piston travel - has hollow piston rod with two rotatable threaded adjusters

Also Published As

Publication number Publication date
SE0500628L (sv) 2006-09-19
PL1866547T3 (pl) 2013-11-29
EP1866547A4 (de) 2012-05-30
EP1866547A1 (de) 2007-12-19
SE528417C8 (sv) 2007-01-30
DK1866547T3 (da) 2013-09-02
WO2006098682A1 (en) 2006-09-21
SE528417C2 (sv) 2006-11-07

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