EP0589889A1 - Creep resistant metal to plastic interconnection - Google Patents
Creep resistant metal to plastic interconnectionInfo
- Publication number
- EP0589889A1 EP0589889A1 EP92906322A EP92906322A EP0589889A1 EP 0589889 A1 EP0589889 A1 EP 0589889A1 EP 92906322 A EP92906322 A EP 92906322A EP 92906322 A EP92906322 A EP 92906322A EP 0589889 A1 EP0589889 A1 EP 0589889A1
- Authority
- EP
- European Patent Office
- 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.)
- Ceased
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 35
- 229920003023 plastic Polymers 0.000 title claims abstract description 35
- 239000002184 metal Substances 0.000 title claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 24
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 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
- 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
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010951 brass 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
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 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
Definitions
- This invention relates to a metal to plastic interconnection 5 device. More particularly, the invention relates to a device for interconnecting plastic and metal parts to restrain both axial and circumferential movement of the parts.
- 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.
- FIG. 1 is a perspective view of the interconnection of this
- FIG. 2 is a longitudinal, sectional view, illustrating the structure and association of the sleeve within plastic and metal parts.
- FIG. 3 is a cross-sectional view taken along line 3-3.
- 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. DETAILED DESCRIPTION OF THE INVENTION
- rigid base member 12 has an annular opening 10 which extends into base member 12 for receiving plastic body member 14.
- Plastic body member 14 is cylindrical in shape and is adapted to receive sleeve member 16. The interfitting parts are dimensioned to be press fitted together. With sleeve member 16 in place, plastic body member is press fitted into base member 12 to form an interconnection.
- sleeve member 16 is positioned over the outer circular surface of plastic base member 22 and cylindrical plastic or metallic member 24 is press fitted into the base member.
- Member may be hollow or solid.
- plastic parts can be made economically by molding processes. These parts are less expensive and lighter in weight than parts which are machined or molded from metal.
- thermoplastic parts is particularly desirable from a recycling standpoint.
- Preferred plastic materials 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 similar properties such as modified epoxies, polyurethanes, various polyhydrocarbons, acrylics, polyvinyl chloride, polyamides, polyacetals and acrylonitrile may be used.
- the metal parts for the interconnection may be steel, aluminum, brass or various well known alloys.
- Typical applications for the interconnection of this invention include engine block and transmission case core plugs, steering wheel gear plugs and numerous other applications where one part is press fitted on the inside or outside of another part.
- end cap dust covers for an automotive streering rack were fabricated from a reinforced polyester compositon, Rynite ® 545 sold by E. I. du Pont de Nemours & Co. The dust 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:
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
Raccordement métal-plastique résistant au fluage, dans lequel l'utilisation d'une douille métallique (16) empêche l'élément en plastique (14) de fluer ou de se séparer d'un élément métallique (12).A creep-resistant metal-to-plastic connection wherein the use of a metal bushing (16) prevents the plastic member (14) from creeping or separating from a metal member (12).
Description
TITLE CREEP RESISTANT METAL TO PLASTIC INTERCONNECTION. FIELD OF THE INVENTION This invention relates to a metal to plastic interconnection 5 device. More particularly, the invention relates to a device for interconnecting plastic and metal parts to restrain both axial and circumferential movement of the parts.
BACKGROUND OF THE INVENTION Press fitted parts are typically made of metal due to plastic 10 creep problems. Interconnected 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 which fixes the movement between plastic and metal parts for interconnections. 15 SUMMARY OF THE INVENTION
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 20 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 embodiment of the invention a metal sleeve is press
25 fitted over a plastic part, after which a metal or plastic body is inserted into the plastic part. The 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. 30 BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the interconnection of this
"f. invention.
FIG. 2 is a longitudinal, sectional view, illustrating the structure and association of the sleeve within plastic and metal parts.
35 FIG. 3 is a cross-sectional view taken along line 3-3.
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. DETAILED DESCRIPTION OF THE INVENTION
Referring now to FIGS. 1-3 of the drawings, rigid base member 12 has an annular opening 10 which extends into base member 12 for receiving plastic body member 14. Plastic body member 14 is cylindrical in shape and is adapted to receive sleeve member 16. The interfitting parts are dimensioned to be press fitted together. With sleeve member 16 in place, plastic body member is press fitted into base member 12 to form an interconnection.
In an alternative embodiment shown in FIGS. 4 and 5, sleeve member 16 is positioned over the outer circular surface of plastic base member 22 and cylindrical plastic or metallic member 24 is press fitted into the base member. Member may be hollow or solid.
The interconnection of this invention has broad applications wherever plastic and metal parts are joined together. Plastic parts can be made economically by molding processes. These parts are less expensive and lighter in weight than parts which are machined or molded from metal. In addition, the use of thermoplastic parts is particularly desirable from a recycling standpoint. Preferred plastic materials 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 similar properties such as modified epoxies, polyurethanes, various polyhydrocarbons, acrylics, polyvinyl chloride, polyamides, polyacetals and acrylonitrile may be used. The metal parts for the interconnection may be steel, aluminum, brass or various well known alloys.
Typical applications for the interconnection of this invention include engine block and transmission case core plugs, steering wheel gear plugs and numerous other applications where one part is press fitted on the inside or outside of another part.
EXAMPLE In one application of the present invention end cap dust covers for an automotive streering rack were fabricated from a reinforced polyester compositon, Rynite®545 sold by E. I. du Pont de Nemours & Co. The dust
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
Press in force for both samples were in excess of 1000 Lbf. Pull out force measured over 850 Lbf at breakage of the end of the cap without any sign of pull out in the press fit area.
Claims
1. A metal to plastic interconnection comprising a rigid metal base having an annular opening therein for receiving a cylindrical plastic body member, said plastic body member having a longitudinal passage for receiving a metal sleeve, said sleeve extending axially into said plastic body member 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 is a thermoplastic member.
3. A metal to plastic interconnection comprising a plastic base member having a circular outer surface and an annular opening for receiving a cylindrical body member, a metal sleeve 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 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 |
|---|---|
| EP0589889A1 true EP0589889A1 (en) | 1994-04-06 |
Family
ID=22230775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92906322A Ceased EP0589889A1 (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
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9316290A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2129989A1 (en) | 1993-08-19 |
| AU1379692A (en) | 1993-09-03 |
| 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 |
|---|---|---|---|
| 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: 19931014 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE |
|
| 17Q | First examination report despatched |
Effective date: 19941221 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
| 18R | Application refused |
Effective date: 19960222 |