GB2149855A - Jack made partly from composite materials - Google Patents

Jack made partly from composite materials Download PDF

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Publication number
GB2149855A
GB2149855A GB08428373A GB8428373A GB2149855A GB 2149855 A GB2149855 A GB 2149855A GB 08428373 A GB08428373 A GB 08428373A GB 8428373 A GB8428373 A GB 8428373A GB 2149855 A GB2149855 A GB 2149855A
Authority
GB
United Kingdom
Prior art keywords
jack
rod
jacks
thin metallic
polymer matrix
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.)
Granted
Application number
GB08428373A
Other versions
GB8428373D0 (en
GB2149855B (en
Inventor
Andre Gerard
Georges Andre
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.)
Aciers et Outillage Peugeot SA
Original Assignee
Aciers et Outillage Peugeot SA
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 Aciers et Outillage Peugeot SA filed Critical Aciers et Outillage Peugeot SA
Publication of GB8428373D0 publication Critical patent/GB8428373D0/en
Publication of GB2149855A publication Critical patent/GB2149855A/en
Application granted granted Critical
Publication of GB2149855B publication Critical patent/GB2149855B/en
Expired legal-status Critical Current

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
    • F15B15/08—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
    • F15B15/1457—Piston rods
    • 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
    • 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
    • F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
    • F15B2215/30—Constructional details thereof
    • F15B2215/305—Constructional details thereof characterised by the use of special materials

Abstract

The invention has for object a jack of the type comprising a cylindrical body (7) in which there slides a piston (16) attached to a rod (15) sliding through a bore (14) in one of the ends (11) of the jack, characterised in that the body of the jack comprises a thin metallic tubular core (3) surrounded by an envelope formed of a composite material constituted by a cross-linked polymer matrix and reinforcing fibres. The rod may also be made of a polymer matrix with reinforcing fibres therein, and optionally having a thin metallic tubular envelope around the matrix. <IMAGE>

Description

SPECIFICATION Jack made partly from composite materials The present invention relates to a jack made partly from composite materials.
Up until now, jacks have been constructed completely of metal. However, for certain applications these jacks prove to be of too great a weight. Therefore, jacks of lower weight have been sought, which jacks should be capable of resisting pressures as high as those which completely metallic jacks can resist.
The present invention aims to provide such jacks. The invention has for an object a jack of the type comprising a cylindrical body in which there slides a piston and attached rod which slides through one of the ends of the jack, characterised in that the body of the jack comprises a thin metallic tubular core surrounded by an envelope portion formed from a composite material constituted by a crosslinked polymer matrix with reinforcing fibres.
The composite materials which are used in the present invention are materials of the type denoted as "high performance", characterised by high mechanical strength both in flexion and in compression.
The comprise a cross-linked polymer matrix which is obtained by cross-linking of a thermosettable resin, These thermosettable resins used for the invention may be, among others, epoxy resins and polyimide resins.
The reinforcing fibres are "high performance" fibres such as glass fibres or carbon fibres.
The body of the jack is advantageously comprised of a thin metallic tubular core and one or more windings of reinforcing fibre filaments embedded in a cross-linked polymer matrix. The body of the jack can be formed by winding filaments impregnated with thermosettable resin upon a thin metallic tube, and cross-linking of the resin.
The present invention additionally permits a reduction or elimination of the step of precise machining of the bore of the jack body, dependent upon the level of manufacturing tolerance or precision chosen for the body.
The rod for the jack can be produced by the moulding of a mixture of a thermosettable resin and reinforcing fibres in a thin metallic tube. After cross-linking of the resin a hybrid rod is obtained comprising a thin metallic envelope around a fibre reinforced resin interior portion. This rod is particularly light and possesses good mechanical properties. As with the metallic core of the body of the jack, this metallic envelope of the rod reduces or eliminates the machining step, according to the chosen degree of precision of the tube.
It is also possible to obtain the jack rod by moulding of the mixture in a mould.
After cross-linking, removal from the mould is carried out and a particularly light and effective rod is obtained. By way of variant, it is possible to obtain the rods by continuous drawing in a thermally regulated machine equipped with a die through which the mixture is extruded and cross-linked. The rods are then cut to the desired length.
The ends of the jacks can be metallic, of plastics material, or of a composite material.
These ends, which include a fluid inlet or outlet, take the form of an end closure and serve to cap the extremities of the body of the jack.
The ends of the jacks are glued onto the body portion by a thermosettable glue, suitably an epoxy glue.
The jack rods are likewise glued to the pistons, which in the conventional manner are made from metal, and at their other extremity to the operating mechanism.
The jacks according to the present invention are thus appreciably easier to assemble than the conventional metallic jacks of the "double tube" type where a mechanical operation such as crimping was necessary.
These jacks have compression strengths which can reach 25.1or Pa and even 50.106 Pa in the case of those with bodies having a metallic core.
These jacks furthermore have weights less than 50% of those of those of conventional metallic jacks.
These jacks possess, furthermore, a very good resistance to shocks, especially from impact of small projectiles, whereas conventional metallic jacks are easily subjected to permanent deformation. This good impact resistance permits the continued functioning of the jacks even in case of accidental impact, which is very important from the point of view of safety, (in particular in the automobile industry, armaments industry and aeronautics).
The invention is set forth below in greater detail with the aid of drawings which are representative only of some forms of embodiment.
In the drawings: Figure 1 is a cross-sectional view of a jack body used in the invention; Figure 2 is a cross-sectional view of a jack rod used in the invention; Figure 3 is a variant of Fig. 2; Figure 4 is a longitudinal sectional view of a jack according to the present invention.
The body of the jack represented diagrammatically in Fig. 1 is constituted by a cylindrical winding 1 of filaments of fibres such as glass fibres embedded or encased in a matrix 2 of thermosettable resin around a thin metallic tubular core 3.
The rod of the jack as represented in Fig. 2 is constituted by a matrix 4 of cylindrical form containing reinforcing fibres 5 in the dispersed state.
The rod of the jack as represented in Fig. 3 is a variant of Fig. 2 and includes a thin metallic envelope 6.
The jack according to the invention as represented in Fig. 4 includes a cylindrical body 7 as represented in Fig. 1. Its two extremities 8 and 9 are capped by end closures 10 and 11 respectively which are glued onto the extremities 8 and 9.
The end caps 10 and 11 are equipped with pipes 1 2 and 1 3 respectively for the supply and exit of hydraulic fluid.
The end cap 11 is provided with a bore 1 4 through which there slides the jack rod 15, which is likewise of composite material. A metallic piston 1 6 is glued to the extremity of this rod 15.
The following example i!lustrates the manufacture of jacks according to the invention.
EXAMPLE a) Jack Body The jack body is constituted by a spooling or winding of glass fibres R impregnated with epoxy resin, constituted by a mixture of 100 parts by weight of bisphenol A diglycidyl ether having an epoxy equivalent of 1 90 and a viscosity of 1 3.5 Pa.s at 25"C. and of 38 parts by weight of 4,4'-methylene dianiline upon a thin metallic tube of XC 48, thickness 3/10 and an internal diameter of 28 mm.
The winding of the impregnated glass fibres R upon the metallic tube is carried out in such a way as to lead eventually to the following hybrid composite structure.: steel tube 3/10 a layer at 90 a layer at + 45 a layer at 90 After winding the assembly is stoved for 2 hours at 80"C.
b) Jack rod The jack rod is constituted by glass fibres E impregnated with epoxy resin (fibre/resin percentage 75/25).
The composite rod is moulded by extrusion drawing of glass fibres E impregnated with epoxy resin through a die heated at 140"C.
The drawing speed is 1 m./min.
The cutting of the rod to length is effected continuously. Then the glueing of the metallic extremities (piston and operating element) is effected with the aid of an epoxy glue (treatment for 1 hour at 1 30on).
c) Assembly The jack ends are constituted by two pieces of Z 200 C13 steel.
The assembling of the body and the ends is effected by glueing with an epoxy glue (treatment for 1 hour at 1 30 C).
Thus one obtains a jack able to withstand a pressure of 35.106 Pa.
The total weight of the composite materials and the ends of the jack represents only 371 g., that is a gain of about 60% compared with a conventional metallic jack.

Claims (5)

1. A jack of the type comprising a cylindrical body in which there slides a piston attached to a rod sliding through one of the ends of the jack. characterised in that the jack body comprises a thin metallic tubular core surrounded by an envelope formed of a composite material constituted by a cross-linked polymer matrix and reinforcing fibres.
2. A jack according to claim 1, characterised in that the rod of the jack comprises a composite material constituted by a crosslinked polymer matrix and reinforcing fibres.
3. A jack according to claim 2, characterised in that the rod of the jack further comprises a thin metallic envelope.
4. A jack substantially as hereinbefore described and illustrated with reference to Figs.
1,2 and 4.
5. A jack substantially as hereinbefore described and illustrated with reference to Figs.
1,3 and 4.
GB08428373A 1983-11-10 1984-11-09 Jack made partly from composite materials Expired GB2149855B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8317972A FR2554876B1 (en) 1983-11-10 1983-11-10 COMPOSITE MATERIAL BASED CYLINDER

Publications (3)

Publication Number Publication Date
GB8428373D0 GB8428373D0 (en) 1984-12-19
GB2149855A true GB2149855A (en) 1985-06-19
GB2149855B GB2149855B (en) 1987-11-25

Family

ID=9294022

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08428373A Expired GB2149855B (en) 1983-11-10 1984-11-09 Jack made partly from composite materials

Country Status (5)

Country Link
DE (1) DE8433253U1 (en)
ES (1) ES282838Y (en)
FR (1) FR2554876B1 (en)
GB (1) GB2149855B (en)
IT (1) IT1179817B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701065A3 (en) * 1994-08-27 1996-12-27 Lingk & Sturzebecher Gmbh Pressure actuator for high pressure hydraulics
BE1014152A3 (en) * 2001-05-03 2003-05-06 Groep Stevens Int Nv Vehicle with hydraulic cylinder, uses aqueous liquid as hydraulic fluid and has cylinder made from fibre reinforced polymer parts
ITMI20120272A1 (en) * 2012-02-23 2013-08-24 Cifa Spa TUBULAR BODY IN COMPOSITE MATERIAL AND RELATIVE PROCEDURE FOR IMPLEMENTING THE TUBULAR BODY
EP4317710A3 (en) * 2022-08-03 2024-04-03 Carbonveneta Tecnologia Nei Compositi S.r.l. Pneumatic cylinder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4261385A1 (en) * 2023-01-24 2023-10-18 DWL Baumaschinen AG Straightening press unit for a trenchless line construction

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1547888A (en) * 1975-09-04 1979-06-27 Oiles Industry Co Ltd Plastics air cylinder assembly

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451089A (en) * 1945-08-20 1948-10-12 Casimir A Miketta Hydraulic cylinder construction
DE1188880B (en) * 1958-10-20 1965-03-11 Reinhold Ficht Working cylinder with hydraulically or pneumatically acted upon piston, in particular control cylinder
US3343460A (en) * 1965-08-20 1967-09-26 Otis V Jones Method and means for joining end caps to a cylinder
FR1541967A (en) * 1967-10-26 1968-10-11 Improvements in the assembly of piston-cylinder systems
US4300439A (en) * 1979-09-10 1981-11-17 United Technologies Corporation Ballistic tolerant hydraulic control actuator and method of fabricating same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1547888A (en) * 1975-09-04 1979-06-27 Oiles Industry Co Ltd Plastics air cylinder assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701065A3 (en) * 1994-08-27 1996-12-27 Lingk & Sturzebecher Gmbh Pressure actuator for high pressure hydraulics
BE1014152A3 (en) * 2001-05-03 2003-05-06 Groep Stevens Int Nv Vehicle with hydraulic cylinder, uses aqueous liquid as hydraulic fluid and has cylinder made from fibre reinforced polymer parts
ITMI20120272A1 (en) * 2012-02-23 2013-08-24 Cifa Spa TUBULAR BODY IN COMPOSITE MATERIAL AND RELATIVE PROCEDURE FOR IMPLEMENTING THE TUBULAR BODY
WO2013124729A1 (en) * 2012-02-23 2013-08-29 Cifa Spa Tubular body made of composite material and corresponding method for making said tubular body
EP4317710A3 (en) * 2022-08-03 2024-04-03 Carbonveneta Tecnologia Nei Compositi S.r.l. Pneumatic cylinder

Also Published As

Publication number Publication date
GB8428373D0 (en) 1984-12-19
ES282838Y (en) 1986-09-01
IT8468125A0 (en) 1984-11-09
IT1179817B (en) 1987-09-16
ES282838U (en) 1986-02-01
FR2554876A1 (en) 1985-05-17
FR2554876B1 (en) 1988-02-26
IT8468125A1 (en) 1986-05-09
DE8433253U1 (en) 1985-03-21
GB2149855B (en) 1987-11-25

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee