US3696714A - Fluid-operated cylinder - Google Patents

Fluid-operated cylinder Download PDF

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Publication number
US3696714A
US3696714A US4181*[A US3696714DA US3696714A US 3696714 A US3696714 A US 3696714A US 3696714D A US3696714D A US 3696714DA US 3696714 A US3696714 A US 3696714A
Authority
US
United States
Prior art keywords
piston
fluid
interspace
liner
cylindrical 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.)
Expired - Lifetime
Application number
US4181*[A
Other languages
English (en)
Inventor
Pier Luigi Panigati
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.)
Etablissement dOccident
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
Application granted granted Critical
Publication of US3696714A publication Critical patent/US3696714A/en
Assigned to ETABLISSEMENT D'OCCIDENT reassignment ETABLISSEMENT D'OCCIDENT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PANIGATI, PIER L.
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
    • F15B15/08—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
    • F15B15/1428—Cylinders
    • 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
    • F15B15/1442—End cap sealings
    • 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
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
    • F16J10/02—Cylinders designed to receive moving pistons or plungers
    • F16J10/04—Running faces; Liners

Definitions

  • the present invention relates to a fluid-operated cylinder both for single and double acting uses.
  • the sealing between the piston and the cylindrical wall in fluid-operated cylinders is obtained by seals or gaskets of resilient material provided on the lateral surface of the piston.
  • the main object of the present invention is that of providing a fluid-operated cylinder where the sealing between piston and housing is obtained for a much longer time period than that permissible in the cylinders in use at present.
  • Another object is that of providing a fluid-operated cylinder which can be manufactured at a lower cost than the known types, the performance being equal.
  • Another object of thisinvention is that of providing a fluid-operated cylinder of rational design and of efficient and regular operation.
  • a fluidoperated cylinder characterized in that the sealing between piston and cylindrical housing is obtained by means of a tubular element of resilient material, such as rubber, plastics material or the like, which extends to a length at least equal to the piston stroke length and is arranged in such manner as to define the said cylindrical housing in which the said piston is slidably mounted, the latter being peripherally rounded and having a maximum diameter slightly greater than the inner diameter of the said tubular element.
  • a tubular element of resilient material such as rubber, plastics material or the like
  • FIG. 1 is an axial section view of the fluid-operated cylinder according to the invention
  • FIGS. 2, 3 and 4 are partial axial section views of three respective embodiments of the fluid-operated cylinder according to the invention.
  • the fluid-operated cylinder consists of a tubular metal housing 1, preferably cylindrical in shape, within which a tubular element or liner is arranged which is also preferably of cylindrical shape and consisting of resilient material, such as rubber, plastics material or like elastomeric material.
  • the tubular element 2 defines a cylindrical space or chamber and extends to a length slightly longer than that of the piston stroke.
  • the fluidoperated cylinder includes heads 3 which may be provided both for single and double-acting operation.
  • a piston 5 Fixed to the stem 4 of the cylinder is a piston 5 without gaskets or seals and having a maximum diameter slightly larger than the inner diameter of the tubular element 2. With this arrangement the piston 5 causes the tubular element 2 to deform by pressing the same so as to provide the sealing. From FIG. 3 it appears clear that the liner 2c is pressed against the housing 1 thereby separating the interspace between the liner 2c and the housing 1 in two portions.
  • the piston 5 secured to the stem 4, such as by welding, also has a rounded outline in order to permit the sliding movement within the cylindrical space without damaging the tubular element 2, thus also reducing friction along the contact surface.
  • the rim 5a of the piston 5 has an arcuated outline in cross-section, which approximates a semicircle.
  • a turn out edge 2a at each end of the tubular element 2 is provided which is arranged to secure the tubular element 2 to the heads 3 and to engage with a respective metal ring 6 which is positioned between the tubular housing 1 and the said tum-out edge 2a.
  • a ring 7 is also connected to each end of the cylindrical housing 1, which has an inner shoulder 7a against which a ring 8 fixed to the cylindrical housing 1, abuts this ring 8 may consist, for example, of an elastic steel ring).
  • the ring 7 is connected to the relative head 3 by means of screws 9 which are screwed into relative threaded holes formed in the ring 7.
  • the ring 7 and head 3 may approach one another when screws 9 are tightened, thus causing the tum-out edge 2a to be pressed by the metal ring 6.
  • the ring 7 acts on the ring 8 which is fixed to the cylindrical housing 1 and thus causes the latter to urge against the metal ring 6 and to press the tum-out edge 2a of the tubular element 2.
  • this is a relative movement in so far as the cylindrical housing 1 being considered stationary, the screwing of the screws 9 causes the heads 3 to move towards the cylindrical housing.
  • the rim 5a of this piston presses and slightly stresses the tubular element 2, because as stated above, the maximum diameter of piston 5 is greater than that of the inner diameter of the tubular elements 2, thus providing an effective sealing.
  • the reciprocating movement of the piston 5 will cause wearing on the whole inner surface of the tubular element 2 between the heads 3. This is advantageous when bearing in mind that in conventional cylinders wear occurs on the gasket which is carried by the piston and is friction stressed during the whole piston stroke.
  • the work point continuously moves along the tubular element 2, thus the wear is distributed on a large surface and a longer useful life is attained. It is thus possible to provide a sealing life considerably longer than that possible with conventional cylinders.
  • the arrangement is completely similar to that described above except that the tubular element of resilient material is so arranged as to define a gap or tubular interspace with the cylindrical housing 1.
  • This interspace contains an interspace fluid which is the same as the cylinder operating fluid.
  • tubular element of resilient material has a thickness lower than that of the tubular element 2 in FIG. 1.
  • the securing system of the tubular element of resilient material in such embodiments is substantially the same as that described above. The only difference is shown by the metal ring 60 which has an L-shaped cross-section instead of the rectangular cross-section of the metal ring 6 in FIG. 1.
  • the said L-shaped cross-section of the metal ring 6a defines in fact the gap between the tubular element of resilient material and the cylindrical housing 1.
  • tubular elements 20 and 2d are provided with holes at the ends thereof in the embodiments shown in FIGS. 3 and 4.
  • tubular element 20 in FIG. 3 is formed with simple holes 10 at the ends thereof, while the tubular element 2d in FIG. 4 is provided with holes 1 1 having tabs 11a outwardly which act as single direction valves.
  • FIGS. 3, 4 and 5 The operation in the embodiments shown in FIGS. 3, 4 and 5 is completely similar to that described above, one difference being that the tubular elements of resilient material are deformed to a larger extent, as clearly shown in the same Figures.
  • the holes communicate the gap between the tubular element 2c and the cylindrical housing 1 with the relative work spaces defined by the piston 5. A fluid flow thus occurs throughout said holes 10.
  • the fluid can thus enter the gap through the holes 1 l, but cannot come out.
  • the fluid-operated cylinder according to the invention provides a regular and safe operation with a long useful life of the sealing between piston and cylindrical housing. Accuracy requirements in the geometrical and physical characteristics of the tube are also reduced, and thus the fluidoperated cylinder according to the invention may be manufactured at a lower cost relatively to the known types by making use of less costly material which may be machined with relatively large tolerances.
  • the structure according to the invention also permits a ready manufacturing of cylinders having a standart section and of any shape (square or another form) so that the overall dimensions of the parallepipedon being equal, the trust surface is greater and rotation is prevented at the same time.
  • Fu ermore the structure according to the invention pennits long stroke cylinder being readily manufactured.
  • cylinder according to the invention may be manufactured for particular applications only with the tubular element of resilient material, thus dispensing with the holding outer housing 1.
  • a fluid operated cylinder including a cylindrical housing, a piston slidable therein and a sealing member between said piston and said cylindrical housing, said sealing member being in the fonn of a deformable liner of substantially elastomeric material, said liner defining a cylinder cavity and extending over a length at least equal to the piston stroke length and allowing slidable movement of the piston therein, the normal diameter of said deformable liner being normally less than the inner diameter of said cylindrical housing thereby forming a tubular interspace therebetween, an interspace fluid within said interspace and wherein, according to the improvement, said liner has at least one opening at least near the end of stroke position of the piston, said opening providing communication between said tubular interspace and said cylinder cavity, said interspace fluid being the same as the cylinder operating fluid contained within said cylinder cavity and said piston having a diameter greater than the normal diameter of said liner and such as to press the liner portion nearest to said piston against the cylinder walls so as to separate thereby said interspace in two portions.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)
US4181*[A 1969-11-11 1969-12-29 Fluid-operated cylinder Expired - Lifetime US3696714A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2426969 1969-11-11
IT1149769 1969-12-10

Publications (1)

Publication Number Publication Date
US3696714A true US3696714A (en) 1972-10-10

Family

ID=26326406

Family Applications (1)

Application Number Title Priority Date Filing Date
US4181*[A Expired - Lifetime US3696714A (en) 1969-11-11 1969-12-29 Fluid-operated cylinder

Country Status (12)

Country Link
US (1) US3696714A (enrdf_load_stackoverflow)
JP (1) JPS5023095B1 (enrdf_load_stackoverflow)
AT (1) AT295019B (enrdf_load_stackoverflow)
CA (1) CA937255A (enrdf_load_stackoverflow)
CH (1) CH519670A (enrdf_load_stackoverflow)
DE (1) DE2053330A1 (enrdf_load_stackoverflow)
ES (1) ES385789A1 (enrdf_load_stackoverflow)
FR (1) FR2068979A5 (enrdf_load_stackoverflow)
GB (1) GB1331277A (enrdf_load_stackoverflow)
NL (1) NL6918558A (enrdf_load_stackoverflow)
SE (1) SE365849B (enrdf_load_stackoverflow)
SU (1) SU499833A3 (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527395A (en) * 1981-06-04 1985-07-09 Allied Corporation Master cylinder
US4696223A (en) * 1978-12-19 1987-09-29 American Standard Inc. Pneumatic pressure actuator
US5147328A (en) * 1989-06-02 1992-09-15 Becton, Dickinson And Company Syringe assembly
US5181588A (en) * 1991-05-06 1993-01-26 Emmons J Bruce Open framework disc brake caliper having an elastomeric cylinder liner
US5249649A (en) * 1991-06-03 1993-10-05 Emmons J Bruce Disc brake caliper of continuous hoop type
WO1994015757A1 (en) * 1993-01-18 1994-07-21 Danfoss A/S Process for mounting a cylinder sleeve in a base member, and a hydraulic machine
US5899136A (en) * 1996-12-18 1999-05-04 Cummins Engine Company, Inc. Low leakage plunger and barrel assembly for high pressure fluid system
GB2340191A (en) * 1998-03-02 2000-02-16 Cummins Engine Co Inc Low leakage plunger and barrel assembly for high pressure fluid system
US20050166984A1 (en) * 2002-04-30 2005-08-04 Jan Verhaeghe Fluid accumulator
US20090126815A1 (en) * 2007-11-08 2009-05-21 Rajabi Bahram S Lightweight high pressure repairable piston composite accumulator with slip flange
US20150354608A1 (en) * 2013-05-16 2015-12-10 Festo Ag & Co., Kg Drive Unit of a Fluid-Actuated Linear Drive and Method for its Manufacture
CN107859669A (zh) * 2017-12-27 2018-03-30 宣城铁凝机械有限公司 一种高密封度的打刀缸
CN108019397A (zh) * 2017-12-27 2018-05-11 宣城铁凝机械有限公司 一种高密封度的气液联动结构
CN108050126A (zh) * 2017-12-27 2018-05-18 宣城铁凝机械有限公司 一种打刀缸的气液联动结构
CN108050127A (zh) * 2017-12-27 2018-05-18 宣城铁凝机械有限公司 一种高密封度的气压缸
CN108087374A (zh) * 2017-12-27 2018-05-29 宣城铁凝机械有限公司 一种定位精准的气液联动结构
CN108087375A (zh) * 2017-12-27 2018-05-29 宣城铁凝机械有限公司 一种定位精准的打刀缸
US10473076B2 (en) * 2015-12-16 2019-11-12 Delphi Technologies Ip Limited High pressure pump with pump spring sealing sleeve

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2206335C3 (de) * 1972-02-10 1981-09-17 Binhack, Josef, Ing.(grad.), 7540 Neuenbürg Hydraulische Hub- oder Verschiebevorrichtung
CH642145A5 (de) * 1979-04-06 1984-03-30 Hydrowatt Syst Verfahren und einrichtung zur schmiermittelzufuehrung an einer kolben-zylinderanordnung.
JPS565546U (enrdf_load_stackoverflow) * 1979-06-25 1981-01-19
US4363387A (en) * 1979-11-13 1982-12-14 The Bendix Corporation Wheel cylinder and torque plate construction
NL185173C (nl) * 1981-02-20 1990-02-01 Noord Nederlandsche Maschf Hydraulische inrichting.
DE3145494A1 (de) * 1981-11-16 1983-05-26 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Einrichtung zur fuehrung des kolbens eines arbeitszylinders
JPS58177149U (ja) * 1982-05-21 1983-11-26 日産自動車株式会社 作業用防護マスク
DE19732934A1 (de) * 1997-07-31 1999-02-04 Mannesmann Rexroth Ag Hydraulischer Zylinder in Zugankerbauart, insbesondere für Kleinpressen
JP5464408B2 (ja) * 2009-05-18 2014-04-09 Ｓｍｃ株式会社 流体圧シリンダ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1621858A (en) * 1921-01-19 1927-03-22 Sherwood Charles Frederic Reciprocating pump
DE848441C (de) * 1948-11-30 1952-09-04 Ernst Dr Schnabel Dichtung
US3084717A (en) * 1957-08-28 1963-04-09 Howard M Purcell Piston type accumulator with flexible cylinder wall

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1621858A (en) * 1921-01-19 1927-03-22 Sherwood Charles Frederic Reciprocating pump
DE848441C (de) * 1948-11-30 1952-09-04 Ernst Dr Schnabel Dichtung
US3084717A (en) * 1957-08-28 1963-04-09 Howard M Purcell Piston type accumulator with flexible cylinder wall

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696223A (en) * 1978-12-19 1987-09-29 American Standard Inc. Pneumatic pressure actuator
US4527395A (en) * 1981-06-04 1985-07-09 Allied Corporation Master cylinder
US5147328A (en) * 1989-06-02 1992-09-15 Becton, Dickinson And Company Syringe assembly
US5181588A (en) * 1991-05-06 1993-01-26 Emmons J Bruce Open framework disc brake caliper having an elastomeric cylinder liner
US5249649A (en) * 1991-06-03 1993-10-05 Emmons J Bruce Disc brake caliper of continuous hoop type
WO1994015757A1 (en) * 1993-01-18 1994-07-21 Danfoss A/S Process for mounting a cylinder sleeve in a base member, and a hydraulic machine
US5899136A (en) * 1996-12-18 1999-05-04 Cummins Engine Company, Inc. Low leakage plunger and barrel assembly for high pressure fluid system
WO1999045299A1 (en) * 1996-12-18 1999-09-10 Cummins Engine Company, Inc. Low leakage plunger and barrel assembly for high pressure fluid system
GB2340191A (en) * 1998-03-02 2000-02-16 Cummins Engine Co Inc Low leakage plunger and barrel assembly for high pressure fluid system
GB2340191B (en) * 1998-03-02 2002-07-24 Cummins Engine Co Inc Low leakage plunger and barrel assembly for high pressure fluid system
US20050166984A1 (en) * 2002-04-30 2005-08-04 Jan Verhaeghe Fluid accumulator
US7048009B2 (en) * 2002-04-30 2006-05-23 Groep Stevens International, Naamloze Vennootschap Fluid accumulator
US20090126815A1 (en) * 2007-11-08 2009-05-21 Rajabi Bahram S Lightweight high pressure repairable piston composite accumulator with slip flange
US8695643B2 (en) * 2007-11-08 2014-04-15 Parker-Hannifin Corporation Lightweight high pressure repairable piston composite accumulator with slip flange
US20150354608A1 (en) * 2013-05-16 2015-12-10 Festo Ag & Co., Kg Drive Unit of a Fluid-Actuated Linear Drive and Method for its Manufacture
US9995323B2 (en) * 2013-05-16 2018-06-12 Festo Ag & Co., Kg Drive unit of a fluid-actuated linear drive and method for its manufacture
US10473076B2 (en) * 2015-12-16 2019-11-12 Delphi Technologies Ip Limited High pressure pump with pump spring sealing sleeve
CN107859669A (zh) * 2017-12-27 2018-03-30 宣城铁凝机械有限公司 一种高密封度的打刀缸
CN108019397A (zh) * 2017-12-27 2018-05-11 宣城铁凝机械有限公司 一种高密封度的气液联动结构
CN108050126A (zh) * 2017-12-27 2018-05-18 宣城铁凝机械有限公司 一种打刀缸的气液联动结构
CN108050127A (zh) * 2017-12-27 2018-05-18 宣城铁凝机械有限公司 一种高密封度的气压缸
CN108087374A (zh) * 2017-12-27 2018-05-29 宣城铁凝机械有限公司 一种定位精准的气液联动结构
CN108087375A (zh) * 2017-12-27 2018-05-29 宣城铁凝机械有限公司 一种定位精准的打刀缸

Also Published As

Publication number Publication date
NL6918558A (enrdf_load_stackoverflow) 1971-05-13
ES385789A1 (es) 1974-06-01
DE2053330A1 (de) 1971-05-27
SU499833A3 (ru) 1976-01-15
AT295019B (de) 1971-12-27
FR2068979A5 (enrdf_load_stackoverflow) 1971-09-03
GB1331277A (en) 1973-09-26
JPS5023095B1 (enrdf_load_stackoverflow) 1975-08-05
SE365849B (enrdf_load_stackoverflow) 1974-04-01
CH519670A (de) 1972-02-29
CA937255A (en) 1973-11-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ETABLISSEMENT D OCCIDENT, VADUZ, LIECHTENSTEIN) PO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PANIGATI, PIER L.;REEL/FRAME:003923/0321

Effective date: 19811020