CA2129989A1 - Creep resistant metal to plastic interconnection - Google Patents
Creep resistant metal to plastic interconnectionInfo
- Publication number
- CA2129989A1 CA2129989A1 CA 2129989 CA2129989A CA2129989A1 CA 2129989 A1 CA2129989 A1 CA 2129989A1 CA 2129989 CA2129989 CA 2129989 CA 2129989 A CA2129989 A CA 2129989A CA 2129989 A1 CA2129989 A1 CA 2129989A1
- Authority
- CA
- Canada
- Prior art keywords
- plastic
- interconnection
- metal
- body member
- sleeve
- 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.)
- Abandoned
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 30
- 229920003023 plastic Polymers 0.000 title claims abstract description 30
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 24
- 239000002184 metal Substances 0.000 title claims abstract description 24
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920006397 acrylic thermoplastic Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
- F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B17/00—Connecting constructional elements or machine parts by a part of or on one member entering a hole in the other and involving plastic deformation
- F16B17/004—Connecting constructional elements or machine parts by a part of or on one member entering a hole in the other and involving plastic deformation of rods or tubes mutually
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
- F16L47/24—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics for joints between metal and plastics pipes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Insulated Metal Substrates For Printed Circuits (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Formation Of Insulating Films (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- General Details Of Gearings (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
A creep resistant metal to plastic interconnection is provided wherein the plastic member (14) is restrained from creeping or pulling apart from a metal member (12) by use of a metal sleeve (16).
Description
~l~g989 UO 93tl6290 PCT/US92/00956 TITLE
CREEP RESIST~T METAL TO PL,ASTIC I~TERCOI~TI~'ECTIO~'.
FIELD OF TE~E INVEI~TTIO.~' This invention relates to a metal to p]astic interconnection 5 device. More particularly, the invention relates to a device for interconnecting plastic and mètal parts to restrain both axial and circumferential movement of the parts.
BACKGROUND OF THE Tl~TVE!~T101~
Press fitted parts are typically made of metal due to plastic 10 creep problems. lnterconnected plastic parts tend to change dimensions and creep or pull apart as they are subjected to stresses and changes in temperature. These changes prevent the parts from maintaining an adequate seal and resist pull out forces. Accordingly, there is a need for a device whichfixes the movement between plastic and metal parts for interconnections.
SUMMARY OF THE I~ 'TlON
The present invention involves an insert molding or post mold press fit of a metal sleeve to the inner diameter of a plastic molded part which is then press fitted to another part. The plastic molded part with the insert is then press fitted to a rigid metal housing. Surprisingly, it has been 2 o found that the resistance to creep or pull apart increases during the period after the parts have been press fitted together. This is believed to be due to cold flow of the plastic material into surface imperfections in the rigid metal housing.
In another embodimenl of the invention a metal sleeve is press 2 5 fi~ted over a plastic part, after which a metal or plastic body is inserted into the plastic part. 1 he cold flow characteristic mentioned above also occurs in this embodiment.
The invention will be more fully described by reference to the acompanying drawings wherein like numerals refer to like parts.
CREEP RESIST~T METAL TO PL,ASTIC I~TERCOI~TI~'ECTIO~'.
FIELD OF TE~E INVEI~TTIO.~' This invention relates to a metal to p]astic interconnection 5 device. More particularly, the invention relates to a device for interconnecting plastic and mètal parts to restrain both axial and circumferential movement of the parts.
BACKGROUND OF THE Tl~TVE!~T101~
Press fitted parts are typically made of metal due to plastic 10 creep problems. lnterconnected plastic parts tend to change dimensions and creep or pull apart as they are subjected to stresses and changes in temperature. These changes prevent the parts from maintaining an adequate seal and resist pull out forces. Accordingly, there is a need for a device whichfixes the movement between plastic and metal parts for interconnections.
SUMMARY OF THE I~ 'TlON
The present invention involves an insert molding or post mold press fit of a metal sleeve to the inner diameter of a plastic molded part which is then press fitted to another part. The plastic molded part with the insert is then press fitted to a rigid metal housing. Surprisingly, it has been 2 o found that the resistance to creep or pull apart increases during the period after the parts have been press fitted together. This is believed to be due to cold flow of the plastic material into surface imperfections in the rigid metal housing.
In another embodimenl of the invention a metal sleeve is press 2 5 fi~ted over a plastic part, after which a metal or plastic body is inserted into the plastic part. 1 he cold flow characteristic mentioned above also occurs in this embodiment.
The invention will be more fully described by reference to the acompanying drawings wherein like numerals refer to like parts.
3 o BRIFF DI~iC~PT101~' OF ~E D~AWI~GS
FIG. 1 is a perspective view of the interconnection of this invention.
FIG. 2 is a longitudinal, sectional view, illustrating the structure and association of the sleeve within plastic and metal parts.
3 ~ FIG. 3 is a cross-sectional view ta}ien along line 3-3.
wo 93/16290 PCr/US92/00956 FIG. 4 is an elevational view of another embodiment of the invention in which a base member is plastic and a metal sleeve is fitted onto the outside of the base member.
FIG. 5 is a top view of the embodiment shown in FIG. 4.
PETAlLED DE~SCRlPllON OF THE lNVE~T10~
Referriny, now to FICS. 1-3 of lhe drawings, ri~id base member 12 has an annul;lr opening I0 which extend~ into base member 12 for receiving pl~stic body member 14. Plastic body member 14 is cytindric~l in shape ~nd is ad~pted to receive sleevc member 16. The interîit~ing parts are dimensioned o lO be press fitted together. With sleeve member 16 in place, plastic body member is press fitted into base member I~ to form an int¢rconnection.
In an ~Iternative embodiment shown in FIGS. 4 and ~, sleeve member I6 is positioned over the outer circular surf;~ce of pl~stic base member 2~ ~nd cylin~lric~l plastic or metallic member 2~ is press fitted into the base member. Member may be hollow or solid.
The interconnection of this invention has broad ~pplic~tions wherever plastic and metal p~rts are joined together. Plaslic parts can be ma~e economically by molding processes. lllese parts are less expensive and - ~ lighter in weight than par~s which are m~chined or molded from metal. In 20 :Iddition, the use of thermopl~stic parts is p;lrticul~rly desirable from a recycling standpoint. Preferred plastic m~teri;lls which can be recycled include thermoplastic polyesters such as those disclosed in U.S. Patent 4,352,904. Such materials may contain fillers or reinforcing agents such as glass fibers. Other materials having simil~r propert~es such as modified 25 epoxies, polyureth~nes, various polyhydroc~rbons, acrylics, polyvinyl chloride, polyamides, polyacet~ls and acrylonitrile may be used. The met:ll par~s for the interconnect;on may be steel, ;~luminum, brass or various well l;nown alloys.
Typical applications for the interconnection of this invention include 3 o engine block and transmission case core plugs, steering wheel gear plugs andnumerous other applications where one part is press fitted on the inside or outside of :mother part.
EXA~PLE
In one application of the present in~cntion end c~p ~lust covers for an 3 5 automotive streering racl; were fabricated from ~ reinforced polyester compositon, Rynite~45 sold by E. 1. du Pont de Nemours & Co. The dust 9 9 8 9 1 ~ ' `J ~ ~
. . -- . . -- . --. . . . . . . ~
. . . . . . -- -- -- -- . .
covers were assembled to form an interconnection as shown in FIGS. 1-3.
Base member 12 was cast aluminum and metal sleeve 16 was made from mild steel. Pull tests were conducted over a three day period under the environmental conditions shown in the following table:
TABLE
Pay Time Environment 8:00 AM - 40C
10:00 AM lS0C
4:00 PM 100% Humidi~, 26 2 8:00 AM -40C
2 10:00 A~ lS0C
~; 2 4:00PM lOO~o Hur~udity, 26C
3 8:00AM -40C
3 10:00AM lS0C
3 4:00 PM 100% Humidity, 26C
~ ~ - Press in force for both samples were in excess of 14S93.9 N/m Pull out `~ ~ force measured over 12404.82 N/m at breakage of the end of the cap without any sign of pull out in the press fit area.
FIG. 1 is a perspective view of the interconnection of this invention.
FIG. 2 is a longitudinal, sectional view, illustrating the structure and association of the sleeve within plastic and metal parts.
3 ~ FIG. 3 is a cross-sectional view ta}ien along line 3-3.
wo 93/16290 PCr/US92/00956 FIG. 4 is an elevational view of another embodiment of the invention in which a base member is plastic and a metal sleeve is fitted onto the outside of the base member.
FIG. 5 is a top view of the embodiment shown in FIG. 4.
PETAlLED DE~SCRlPllON OF THE lNVE~T10~
Referriny, now to FICS. 1-3 of lhe drawings, ri~id base member 12 has an annul;lr opening I0 which extend~ into base member 12 for receiving pl~stic body member 14. Plastic body member 14 is cytindric~l in shape ~nd is ad~pted to receive sleevc member 16. The interîit~ing parts are dimensioned o lO be press fitted together. With sleeve member 16 in place, plastic body member is press fitted into base member I~ to form an int¢rconnection.
In an ~Iternative embodiment shown in FIGS. 4 and ~, sleeve member I6 is positioned over the outer circular surf;~ce of pl~stic base member 2~ ~nd cylin~lric~l plastic or metallic member 2~ is press fitted into the base member. Member may be hollow or solid.
The interconnection of this invention has broad ~pplic~tions wherever plastic and metal p~rts are joined together. Plaslic parts can be ma~e economically by molding processes. lllese parts are less expensive and - ~ lighter in weight than par~s which are m~chined or molded from metal. In 20 :Iddition, the use of thermopl~stic parts is p;lrticul~rly desirable from a recycling standpoint. Preferred plastic m~teri;lls which can be recycled include thermoplastic polyesters such as those disclosed in U.S. Patent 4,352,904. Such materials may contain fillers or reinforcing agents such as glass fibers. Other materials having simil~r propert~es such as modified 25 epoxies, polyureth~nes, various polyhydroc~rbons, acrylics, polyvinyl chloride, polyamides, polyacet~ls and acrylonitrile may be used. The met:ll par~s for the interconnect;on may be steel, ;~luminum, brass or various well l;nown alloys.
Typical applications for the interconnection of this invention include 3 o engine block and transmission case core plugs, steering wheel gear plugs andnumerous other applications where one part is press fitted on the inside or outside of :mother part.
EXA~PLE
In one application of the present in~cntion end c~p ~lust covers for an 3 5 automotive streering racl; were fabricated from ~ reinforced polyester compositon, Rynite~45 sold by E. 1. du Pont de Nemours & Co. The dust 9 9 8 9 1 ~ ' `J ~ ~
. . -- . . -- . --. . . . . . . ~
. . . . . . -- -- -- -- . .
covers were assembled to form an interconnection as shown in FIGS. 1-3.
Base member 12 was cast aluminum and metal sleeve 16 was made from mild steel. Pull tests were conducted over a three day period under the environmental conditions shown in the following table:
TABLE
Pay Time Environment 8:00 AM - 40C
10:00 AM lS0C
4:00 PM 100% Humidi~, 26 2 8:00 AM -40C
2 10:00 A~ lS0C
~; 2 4:00PM lOO~o Hur~udity, 26C
3 8:00AM -40C
3 10:00AM lS0C
3 4:00 PM 100% Humidity, 26C
~ ~ - Press in force for both samples were in excess of 14S93.9 N/m Pull out `~ ~ force measured over 12404.82 N/m at breakage of the end of the cap without any sign of pull out in the press fit area.
Claims (4)
1. A metal to plastic interconnection comprising a rigid metal base (12) having an annular opening (10) therein for receiving a cylindrical plastic body member (14), said plastic body member having a longitudinal passage for receiving a metal sleeve (16), said sleeve extending axially into said plastic body member (14) for a portion of the length of said body member, said body member and said sleeve member being dimensioned to be press fitted into said annular opening in said metal base to form said interconnection.
2. The interconnection of Claim 1 wherein said plastic body member (14) is a thermoplastic member.
3. A metal to plastic interconnection comprising a plastic base member (22) having a circular outer surface and an annular opening for receiving a cylindrical body member (24), a metal sleeve (16) dimensioned to be press fitted onto the outer surface of said plastic base member, said cylindrical body member being dimensioned to be press fitted into said annular opening of said plastic base member to form said interconnection.
4. The interconnection of Claim 3 wherein said plastic base member (22) is a thermoplastic member.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US1992/000956 WO1993016290A1 (en) | 1992-02-14 | 1992-02-14 | Creep resistant metal to plastic interconnection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2129989A1 true CA2129989A1 (en) | 1993-08-19 |
Family
ID=22230775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2129989 Abandoned CA2129989A1 (en) | 1992-02-14 | 1992-02-14 | Creep resistant metal to plastic interconnection |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0589889A1 (en) |
| JP (1) | JPH07503515A (en) |
| AU (1) | AU1379692A (en) |
| BR (1) | BR9207084A (en) |
| CA (1) | CA2129989A1 (en) |
| WO (1) | WO1993016290A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH669025A5 (en) * | 1985-06-06 | 1989-02-15 | Fischer Ag Georg | METHOD FOR PRODUCING A TENSILE PIPE CONNECTION AND A PIPE CONNECTION. |
| DE3707341A1 (en) * | 1987-03-07 | 1988-09-15 | Aku Armaturen Gmbh | Connection member for pipe ends |
-
1992
- 1992-02-14 WO PCT/US1992/000956 patent/WO1993016290A1/en not_active Application Discontinuation
- 1992-02-14 BR BR9207084A patent/BR9207084A/en not_active Application Discontinuation
- 1992-02-14 EP EP92906322A patent/EP0589889A1/en not_active Ceased
- 1992-02-14 CA CA 2129989 patent/CA2129989A1/en not_active Abandoned
- 1992-02-14 JP JP4505770A patent/JPH07503515A/en active Pending
- 1992-02-14 AU AU13796/92A patent/AU1379692A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU1379692A (en) | 1993-09-03 |
| EP0589889A1 (en) | 1994-04-06 |
| JPH07503515A (en) | 1995-04-13 |
| WO1993016290A1 (en) | 1993-08-19 |
| BR9207084A (en) | 1995-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |