EP0106036A1 - Socket-and-locknut head for hydraulic cylinder - Google Patents

Socket-and-locknut head for hydraulic cylinder Download PDF

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Publication number
EP0106036A1
EP0106036A1 EP83107320A EP83107320A EP0106036A1 EP 0106036 A1 EP0106036 A1 EP 0106036A1 EP 83107320 A EP83107320 A EP 83107320A EP 83107320 A EP83107320 A EP 83107320A EP 0106036 A1 EP0106036 A1 EP 0106036A1
Authority
EP
European Patent Office
Prior art keywords
liner
cylinder
head
fact
annular shoulder
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.)
Withdrawn
Application number
EP83107320A
Other languages
German (de)
English (en)
French (fr)
Inventor
Remo Sisler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0106036A1 publication Critical patent/EP0106036A1/en
Withdrawn legal-status Critical Current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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1438—Cylinder to end cap assemblies

Definitions

  • This invention refers.to a hydraulic or pneumatic cylinder or the like, with head-locking device, of the type comprising a tubular liner defining a cylindrical chamber closed by two lateral heads mechanically secured to the liner itself.
  • head-locking device of the type comprising a tubular liner defining a cylindrical chamber closed by two lateral heads mechanically secured to the liner itself.
  • hydraulic, pneumatic, oleodynemic or similar cylinders of the aforementioned type, in which the extreme heads of the cylinder are mechanically secured to the intermediate liner by means of stay rods arranged outside and parallel to the axis of the cylinder itself.
  • There are also equally known cylinders whose heads are screwed directly onto the threaded ends of the liner, or welded to the liner.
  • the methods of assembling the heads in the known cylinders present a number of problems and in particular do not offer satisfactory operating reliability - fluid seal - or extreme simplicity in construction and assembling; in fact, their setting, during construction and assembling calls for specialized personnel provided with sophisticated equipments.
  • the use of stay rods calls for rectangular-shaped heads which must be machined and drilled at the corners in order to allow the passage of the stay rods themselves with subsequent longer production times and higher manufacturing costs; the stay rods are moreover,subjected tti different degrees of elongation which present the correct assembling of the heads and their precise axial positioning.
  • a problem common to all types of known cylinders which causes considerable difficulty when fitting the cylinder onto any type of power-consuming machine, consists in the impossibility of orientating the heads in different directions, once assembled, in order to adapt the position of the fluid inlets to the feeding ducts which are usually rigid and have pre-established positions.
  • the cylinder liner consists of a simple tube of limited thickness, which is subject to stress which causes it to become oval during the machining and assembling of the cylinder itself..
  • 'A scope of the invention is to provide a hydraulic, pneumatic,oleodynamic cylinder or the like, provided with a device for securing the heads to the liner, in order to overcome the aforementioned problems and, in particular, to ensure a high degree of operational reliability together with extreme structural and assembling simplicity.
  • a further scope of the invention is to provide a hydraulic, or pneumatic cylinder or the like, as described above, in which the same means for assembling and securing the heads to the liner, act as stiffening elements and prevent the ovalization of the liner itself.
  • a still further scope of the invention is to provide a cylinder, as described, in which the heads can be rotated with respect to the liner, in order to align the fluid inlets precisely with the feeding ducts, and can then be locked in the desired position, thereby ensuring the perfect alignment and correct axial positioning of the heads.
  • a hydraulic, pneumatic, oleodynamic or similar cylinder comprising a tubular liner defining a chamber closed by end heads mechanically secured to the liner itself, characterized by the fact that the locking device comprises an annular shoulder element on the outside of each cylindrical end of the liner and a locknut which is screwed against said annular shoulder element and on the inside of a peripheral wall of the closing head; said annular shoulder element of the liner and said peripheral wall of the locknut presenting opposing flat surfaces for the axial positioning of the head and coaxial cylindrical surfaces for centering the head with respect to the liner itself.
  • the cylinder substantially comprises a tubular liner 1 the ends of which are closed by a respective head 2 into which tightly penetrates the corresponding end of the liner 1.
  • each end of the liner 1 ends with a cylindrical portion la which extends with a portion 1b, with respect to an annular shoulder element acting as an axial stop for the head 2 and as a centering element for the head itself.
  • the annular shoulder element 3 is designed to enter a circular seat 4 provided inside a peripheral wall 5 of the head, which extends from the end wall 6.
  • Both the annular element 3 of the liner and the annular seat 4 in the head present opposing flat shoulder surfaces 3a, 4a arranged at right-angles to the axis of the cylinder, in order to ensure th the correct axial positioning of the parts, and also comprise cylindrical surfaces 3b, 4b, coaxial to the cylinder, in order to achive and maintain a perfect centering or coaxial alignment of the head 2 with respect to the liner 1.
  • the annular shoulder 3 on the liner is integral with the body of the liner and in a slightly retracted position with respect to the extreme edge of the liner itself; in this way the cylindrical extension 1b of the liner penetrated into a corresponding seat7 inside and close to the end wall of the head, in such a way that by making the extension 1b and the seat 7 with equal diameters, barring machining allowances, an additional centering effect is achieved between the liner 1 and the head 2. Consequently, due to the particular shape of the locking device according to the invention, it is possible to keep the axial length of the cylindrical extension 1b of the liner slightly shorter than the axial length or depth of the seat 7 so that the end of the liner does not strike against the end wall 6. of the head. This not only makes the correct assembly of the parts very much easier, but also their construction due to the fact that it is not necessary to keep to precise machining tolerances.
  • Reference 8 indicates a locknut fitted on the corresponding end of the liner 1, which can be screwed on the inside of the cylindrical wall 5 of the head, to tighten it against the annular shoulder 3 of the liner itself. Consequently, the open end of the cylindrical wall 5 of the head 2 is provided with an internally threaded seat 9, into which is screwed the externally threaded body 8a of the locknut 8, as shown; the locknut 8 also presents a rear flange 8b provided with notches to enable it to be gripped with a normal wrench.
  • the head 2 is locked to the liner 1 by means of the interposition of a split ring 10 between the locknut 8 and the annular shoulder 3.
  • This intermediate ring 10 is made elaxtically deformable in a radial direction by means of a crosswire cut 10a to allow it to cross over the annular shoulder 3 on the liner during assembly.
  • the intermediate thrust ring 10 may present a cross-section of any shape whatsoever, however this ring advantageously presents an L-shaped cross-section so as to define a collar 11 which penetrates into the locknut 8 in such a way as to avoid any distortion, as well as an annular flange 12 designed, on one side, to form a shoulder surface against the front end 8c of the locknut, and on the other side against a radial surface 3c of the annular shoulder 3, situated on the opposite side of the previous front shoulder surface 3a.
  • a washer 13 is provided in an annular seat 14 made on the inside of the peripheral wall 5 of the head, to form a seal between the liner 1 and the head 2.
  • FIG. 3 A second simplified embodiment is shown in the detail of figure 3 which embodies the principles of this invention.
  • the annular shoulder element consists of a ring 15, split or made in two parts, placed in a seat 16 machined on the outer surface of the liner 1.
  • the shoulder ring 15 is in a retracted position with respect to the extreme edge of the.liner and co-operates with a seat in the peripheral wall of the head 2 to define an axial stop, and for keeping the parts centered.
  • the head is also locked to the liner 1 by means of a locknut 8, as in the previous case.
  • the extension of the body of the liner beyond the seat 16 of the ring also serves for centering and for forming a seal.
  • Figure 4 of the drawings shows a third solution which is even more advantageous and more economical than the first two, and is especially suitable for cylinders operating at low pressures.
  • the example in figure 4 also comprises a cylindrical liner 1 and a closing head 2, at each end, mechanically fixed to the liner 1 by means of a locknut 8 screwed onto the head itself.
  • the annular shoulder on the liner in this case, consists of the extreme edge 17, which is bent or curved outwards radially, starting from a tubular section cut to the desired length from a steel tube of even thickness.
  • the machining operations necessary for machining the annular shoulder 3 in the previous examples are totally eliminated, as they are replaced by a simple operation consisting of bending the extreme edges of the liner.
  • This third solution proves to be advantageous as it makes it possible to immediately produce cylinders of any length whatsoever.
  • having the.heads and locknuts at one's disposal it is simply necessary to cut the tubes to the required length, fit the two loclmuts facing in the right direction and then shape the extreme edges, bending them radially outwards, to complete the construction of the cylinder in the desired dimensions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP83107320A 1982-07-26 1983-07-26 Socket-and-locknut head for hydraulic cylinder Withdrawn EP0106036A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8284950A IT1226875B (it) 1982-07-26 1982-07-26 Dispositivo per l'assemblaggio frontale rapido tra la camicia e le relative testine dei cilindri a funzionamento oleodinamico, pneumatico idraulico e varie
IT8495082 1982-07-26

Publications (1)

Publication Number Publication Date
EP0106036A1 true EP0106036A1 (en) 1984-04-25

Family

ID=11326316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107320A Withdrawn EP0106036A1 (en) 1982-07-26 1983-07-26 Socket-and-locknut head for hydraulic cylinder

Country Status (2)

Country Link
EP (1) EP0106036A1 (it)
IT (1) IT1226875B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1264990A2 (de) * 2001-05-09 2002-12-11 Hyco Pacoma GmbH Hydraulikzylinder mit Schwenkzapfen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH221672A (de) * 1940-05-17 1942-06-15 Osten Dinnies Von Der Dichtring.
US2691536A (en) * 1950-07-13 1954-10-12 Wiz Products Inc Gasket and retainer for pipe couplings
US2982590A (en) * 1959-03-30 1961-05-02 Clark Equipment Co Cylinder construction
GB1326445A (en) * 1969-11-07 1973-08-15 Sge Research Pty Ltd Coupling arrangements for cylindrical articles
FR2183363A5 (it) * 1972-05-04 1973-12-14 Belles Ondes Forges
DE2747676A1 (de) * 1977-10-25 1979-04-26 Festo Maschf Stoll G Kolben-zylinder-aggregat
GB2077379A (en) * 1980-06-06 1981-12-16 Ekman K R Coupling device for tubular members

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH221672A (de) * 1940-05-17 1942-06-15 Osten Dinnies Von Der Dichtring.
US2691536A (en) * 1950-07-13 1954-10-12 Wiz Products Inc Gasket and retainer for pipe couplings
US2982590A (en) * 1959-03-30 1961-05-02 Clark Equipment Co Cylinder construction
GB1326445A (en) * 1969-11-07 1973-08-15 Sge Research Pty Ltd Coupling arrangements for cylindrical articles
FR2183363A5 (it) * 1972-05-04 1973-12-14 Belles Ondes Forges
DE2747676A1 (de) * 1977-10-25 1979-04-26 Festo Maschf Stoll G Kolben-zylinder-aggregat
GB2077379A (en) * 1980-06-06 1981-12-16 Ekman K R Coupling device for tubular members

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OELHYDRAULIK UND PENEUMATIK, vol. 9, no. 4, April 1965, pages 132-141, Mainz, DE. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1264990A2 (de) * 2001-05-09 2002-12-11 Hyco Pacoma GmbH Hydraulikzylinder mit Schwenkzapfen
EP1264990A3 (de) * 2001-05-09 2003-04-02 Hyco Pacoma GmbH Hydraulikzylinder mit Schwenkzapfen

Also Published As

Publication number Publication date
IT1226875B (it) 1991-02-21
IT8284950A0 (it) 1982-07-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19830806

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19841026