GB2202696A - An electrical crimp terminal using conductive paste - Google Patents
An electrical crimp terminal using conductive paste Download PDFInfo
- Publication number
- GB2202696A GB2202696A GB08800304A GB8800304A GB2202696A GB 2202696 A GB2202696 A GB 2202696A GB 08800304 A GB08800304 A GB 08800304A GB 8800304 A GB8800304 A GB 8800304A GB 2202696 A GB2202696 A GB 2202696A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrical wire
- conductors
- crimping portion
- conductive paste
- electrical
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
- H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
- H01R4/183—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section
- H01R4/184—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion
- H01R4/185—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion combined with a U-shaped insulation-receiving portion
Description
4 t 2202696 ELECTRICAL WIRE CONNECTING METHOD FOR CRIMP TERMINAL AND WIRE
CONNECTOR STRUCTURE
BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an electrical wire connecting method for a crimp terminal and a wire connector structure.
2. Description of the Prior Art
In general, a crimp terminal is composed of a contact portion mounted on an electrical instrument or the like to be connected, an electrical wire conductor crimping portion integrally formed with the contact portion, and a coating insulator crimping portion integral with the conductor crimping portion. The electrical wire conductor crimping portion is used to crimp the conductor of the electrical wire, that is, the wire core, to the terminal, and the coating insulator crimping portion is used to fasten an outer peripheral insulator of the electrical wire to the terminal with the coating outer peripheral insulator being continuous with the wire core.
Each of the electrical wire conductor crimping portion and the coating insulator crimping portion is composed of a tab member that is folded at both edges upwardly and - 1 0 1 curved to form resilient crimping arms. A space for receiving each of the wire core, that is, the conductor of the electrical wire and the coating insulator of the electric wire is defined by the tab member and its resilient crimping arms. The conductors from which the coating has been removed, that is, the wire cores, are inserted into the electrical wire conductor crimping portion, and the electrical wire with the coating is inserted into the coating crimping portion.
Q The respective crimping portions are crimped by tools to perform the connection.- The above-described crimping arms are plastically deformed to come into intimate contact with the wire cores. Even after the fastening pressure of the tool has been removed, the crimping arms are pressingly C> contacted with the wire cores due to resiliency remaining in the resilient crimping arms. The contact pressure of the resilient crimping arms against the wire cores depends upon the magnitude of the plastic deformation of the resilient crimping arms. If the plastic deformation is insufficient, the contact pressure for the core wires is insufficient, and the electric resistance between the electric wire conductor crimping portion and the wire cores is increased. As a result, there is a risk of heat generation or burning, or a malfunction of the electric instrument connected through the terminal would be caused.
61 1 In order to eliminate such a defect, there is a dimensional allowance for a height of the conductor crimping portion to set the wire conductor contact pressure to a suitable level in quality management. However, if a severe allowance would be determined, it would be inevitable to increase the number of the manufacture steps.
Also, a cross-sectional shape of the electric wires is substantially elliptical, and there are a number of gaps or voids between the wire conductor crimping portion and the wire cores and between the adjacent wire cores. As a result, insulating material such as oxide film or the like is generated on an inner circumferential surface of the wire conductor crimping portion and the outer peripheral surface of the wire cores to increase the electric resistance as the time lapses. In order to decrease the electric resistance, there has been provided a soldering process. However, the soldered part is cured or hardened to become fragile. If vibrations or the like would be applied to the fragile soldered part, the connection would readily be broken down.
SUMMARY OF THE INVENTION
In order to eliminate the above-noted defects, an object of the present invention is to provide an electrical wire connector structure for a crimp terminal, in which it is unnecessary to set a severe dimensional allowance 1 1 for an electrical wire conductor crimping portion, there is no fear that insulating material would be formed between the electrical wire conductor crimping portion and wire cores or between the adjacent wire cores, and an electric resistance of the connector structure is very small.
According to the present invention, there is provided an electrical wire connecting method for a crimp terminal, which comprises the steps of applying conductive paste to at least one of an interior of an electric wire conductor crimping portion of the crimp terminal and electrical wire conductors, and thereafter, inserting the electrical wire conductors into the electrical wire conductor crimping portion to fill, with the conductive paste, gaps or voids between the electrical wire conductor crimping portion and the electrical wire conductors.
According to the present invention, the spaces or gaps formed between an inner circumferential surface of the electrical wire conductor crimping portion and the electric conductors, i.e., wire cores and/or between the adjacent electrical wire cores are filled with the conductive paste. Accordingly, the electric resistance of the connecting portion between the electric wire conductor crimping portion and the electric wire cores is considerably reduced. Also, even if a dimension of the electrical wire conductor crimping portion would somewhat deviate from the predetermined dimensional c allowance, it is possible to suppress the increase of the electric resistance.
Also, according to the present invention, there are provided an electrical wire connecting method for a crimp terminal and an electrical wire connector structure therefor, which are characterized in that the gaps are filled with conductive paste so that it is possible to prevent the electric resistance of the electrical wire connecting portion from increasing due to oxide formation or the like.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings:
Fig. 1 is a perspective view of a terminal to which an electrical wire has been crimped, in accordance with the present invention; Figs. 2A, 2B, 2G and 2D show working processes for applying conductive paste according to the invention; Fig. 3 is a graph showing a relationship between an electric resistance of a crimped portion and a lapse of time according to the present invention; Fig. 4 is a perspective view of a terminal to which an electrical wire has been crimped in accordance with the conventional method; and Fig. 5 is a cross-sectional view taken along the line V-V of Fig. 4.
- 5 DETAILED DESCRIPTION OF THE INVENTION
A conventional terminal is shown in Figs. 4 and 5. The crimp terminal A is composed of a contact portion 1, an electrical wire conductor crimping portion 2 contiguous with the contact portion 1 and crimping the electrical wire conductors, and a coating crimping portion 3 contiguous with the electrical wire conductor crimping portion 2 and crimping an outer peripheral portion of the coating of the electrical wire.
The electrical wire conductor crimping portion 2 and the coating crimping portion 3 are provided with tab portions integral with-the contact portion 1, with both ends of the tab portions being bent upwardly and further curved inwardly to form resilient crimping arms 9 and 10, respectively. Spaces for receiving electrical wire conductors, i.e., wire cores 4 and a coating 5 of the electrical wire are internally formed by the resilient crimping arms 9 and 10 and the original tab portions which form bottom walls.
The thus constructured crimp terminal A is connected to the electrical wires, so that the wire cores 4 from which the coating 5 has been stripped and the non-stripped portion of the electric wire having the coating 5 are inserted into the electrical wire conductor crimping portion 2 and the coating crimping portion 3, respectively.
6 The resilient crimping arms 9 are plastically deformed in intimate contact with the wire cores 4 by the crimping pressure of a tool. Even after the crimping pressure of the tool has been removed, the resilient crimping arms 9 are held in press contact with the wire cores 4 by residual resilient or spring force in the resilient crimping arms 9.
The contact pressure of the wire cores 4 of the resilient crimping arms 9 depends upon the magnitude of the plastic deformation of the resilient crimping arms 9 by means of the tool. If the plastic deformation is insufficient, then the contact pressure of the wire cores 4 is insufficient, so that the electric resistance between the electrical wire conductor crimping portion 2 and the wire cores 4 will be increased.
Therefore, such a quality control for the products has been attained that dimensional allowance is set for a height H of the electrical wire conductor crimping portion 2 to avoid the excessive or insufficient contact pressure in the electrical wire conductors, as shown in Fig. 5. Also, cross-sectional shape of the electrical conductors is elliptical to form a number of voids or gaps 6 between the electrical wire crimping portion 2 and the wire cores 4 and/or between the adjacent wire cores 4. Accordingly, there are disadvantages that insulating material such as oxide film or the like is formed on outer surfaces of the wire cores 4 and inner surfaces of the electrical wire conductor crimping portion 2 to increase the electrical resistance as time lapses.
An embodiment of the present invention will now be described with reference to Figs. 1 to 3.
In Figs. 1, and 2A, 2B, 2C and 2D, the same reference numerals are used to indicate the same parts or components as in Figs. 4 and 5.
Fig. 1 is a perspective view showing a crimp terminal according to the present invention. In the same manner Q as in the conventional structure, the crimp terminal A is composed of a contact portion 1, an electrical wire conductor crimping portion 2 connected to the contact portion 1, and a coating crimping portion 3 integral with the electrical wire conductor crimping portion 2. However, according to the present invention, after electrically conductive paste has been applied to an interior of the electrical wire conductor crimping portion 2 and/or electrical wire conductors or cores 4 to be inserted into the electrical wire conductor crimping portion 2, the electrical wire is inserted into the electrical wire conductor crimping portion 2 to crimp the electrical wire conductor crimping portion 2, so that voids or gaps formed between the electrical wire cores 4 and the electrical wire conductor crimping portion 2 and between the electrical wire cores 4, which is different from the conventional technique.
Material having a good conductivity, such as copper paste or the like is. used as the conductive paste.
In the conductive paste applying method, as shown in Fig. 2A, the conductive paste 7 is kept in a container 8, and as shown in Fig. 2B, the electrical wire 4 is dipped into the conductive paste 7.
The-electrical wire 4 which has been picked up from the conductive paste 7 is inserted into the electrical wire conductor crimping portion 2 of the terminal B (see Figs. 2A and 2B).
Since the electrical wire cores 4 are coated with the conductive paste 7 with almost no void, when the electrical wire conductor crimping portion 2 is crimped, the conductive paste 7 is spread sufficiently between the conductor crimping portion 2 and the electrical wire cores 4 and among the adjacent wire cores 4.
Instead of dipping the electrical wire 4 into the conductive paste, the electrical wire crimping portion 2 may be dipped into the conductive paste so as to be sufficiently coated therewith, a nd then the electrical wire 4 is inserted into the thus dipped conductor crimping portion 2 so that the conductor crimping portion 2 is c.rimped. In this case, it is possible to fill the conductive paste 7 in the voids or gaps.
9 - t If the crimp terminal has the electrical conductor crimping portion 2, the crimp terminal may be of any desired shape. For example, the crimp terminal may be of the round type A having an aperture as shown in Fig. 1 or of the female type B as shown in Fig. 2A.
The electrical wire conductor connecting portion that has been filled with the conductor paste 7 has an increased contact area between the conductor crimping portion 2 and the wire cores 4 so that its electric resistance is reduced. In addition, since the conductor crimping portion 2 is sealed by the conductive paste 7, the formation of the oxide film is suppressed so that the increase in the electric resistance due to the aging as is inherent in the conventional structure may be prevented.
Fig. 3 is a graph showing the aging change of the electric resistance of the electrical wire connecting portion disposed in an atmosphere kept at a high temperature. In the graph, the ordinate indicates the resistance and the abscissa indicates the time. As is apparent from the graph, the electric resistance C of the conventional electrical wire conductor connecting portion is gradually increased but the electric resistance D of the connecting portion according to the present invention is kept at a low level without any aging change.
The effect that may be enjoyed by the present invention will now be described.
(a) Since the voids in the crimping portion is filled with the conductive paste so that the contact surface are kept apart from the atmosphere, the formation of the oxide film is suppressed, and it is possible to eliminate the gradual increase of the electric resistance due to the aging, which is inevitable in the conventional technique.
Therefore, it is possible to prevent the heat generation of the electrical wire conductor crimping portion and the accident of break-down thereof. Also, it is possible to provide a wire conductor crimping portion having a high reliability, in which there is no fear of malfunction of the electric instrument connected to the terminal.
In addition, the conductive paste is not hardened as in soldering, and there is no risk of cracks or disengagement. Therefore, the terminal may be used in the severe circumstance in which vibrations are applied to the terminal.
(b) It is necessary to keep a contact pressure at a suitable level between the electric wire conductor crimping portion and the wire cores. Therefore, the severe dimensional allowance must be set for the electrical wire conductor crimping portion in the conventional technique. This needs a number of steps to meet the requirement. Howeve according to the present invention, since it is unnecessary r, to set such a severe dimensional allowance, the crimping work may be facilitated to reduce the number of working steps.
z 4
Claims (10)
1. An electrical wire connecting method for a terminal (A) composed of a contact portion (1), an electrical wire conductor crimping potion (2) connected to the contact portion for crimping conductors (4) of an electrical wire, and a coating crimping portion (3) connected to said electrical wire conductor crimping portion for crimping an outer periphery of a coatina of the electrical wire, said method comprising the steps of:
applying conductive paste to at least one of an interior of the electrical wire conductor crimping portion of said crimp terminal and the conductors of the electrical wire; and thereafter, inserting said conductors of the electrical wires into the electrical wire conductor crimping portion to crimp the electrical wire conductor crimping portion whereby voids formed between the electrical wire conductor crimping portion and the conductors of the electrical wire are filled with the conductive paste.
2. The method according to claim 1, wherein voids between the conductors of the electrical wire are filled with the conductive paste.
13 1
3. The method according to claim 1, wherein in said step of applying, the conductors of the electrical wires are dipped into the conductive paste.
A
4. The method according to claim 1, wherein in said step of applying, the terminal is dipped into the conductive paste.
5. A wire connector structure for a crimp terminal (A), comprising a contact portion (1), an electrical wire conductor crimping portion (2) connected to said co ntact portion for crimping conductors of an electrical wire, and a coating crimping portion (3) connected to said electrical wire conductor connecting portion for crimping an outer periphery of a coating of the electrical wire, wherein voids between said electrical wire conductor crimping portion (2) and said conductors of the electrical wires are filled with conductive paste (7).
6. The structure according to claim 5, wherein voids formed between the adjacent conductors of the electrical wire are filled with the conductive paste.
7. The structure according to claim 5, wherein said crimp terminal is of the round type having an aperture in the contact portion.
8. The structure according to claim 6, wherein said crimp terminal is of the female type having a portion into which the electrical wire conductors are inserted.
1
9. A method of connecting an electrical wire to a terminal substantially as described herein with reference to Fiures 1 and 2 of the accompanying drawings.
10. A wire connector structure substantially as described herein with reference to Figures 1 and 2 of the accompanying drawings.
- i Published 1988 at The Patent OCce, State House, 68171 High Holborn, London WO 1R 4TP. Further copies may be obtained from The patent Offi Sales Branch, St Mary Gray, Orpington, Eent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Oray, Kent. Con. 1187.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6803787 | 1987-03-24 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8800304D0 GB8800304D0 (en) | 1988-02-10 |
| GB2202696A true GB2202696A (en) | 1988-09-28 |
| GB2202696B GB2202696B (en) | 1990-12-19 |
Family
ID=13362195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8800304A Expired - Fee Related GB2202696B (en) | 1987-03-24 | 1988-01-07 | Electrical wire connecting method for crimp terminal and wire connector structure |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3804470A1 (en) |
| GB (1) | GB2202696B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486653A (en) * | 1993-04-27 | 1996-01-23 | Yazaki Corporation | Crimp-style terminal |
| US5532433A (en) * | 1991-11-13 | 1996-07-02 | Yazaki Corporation | Waterproof-type terminal connection structure and method of producing same |
| WO2011071188A1 (en) * | 2009-12-09 | 2011-06-16 | Yazaki Corporation | Wire-Equipped Crimp Terminal and Method of Curing Coating Agent |
| US20110220385A1 (en) * | 2008-11-18 | 2011-09-15 | Auto Kabel Managementgesellschaft Mbh | Connection of Electrical Cables by Ultrasonic Welding |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19727314B4 (en) * | 1997-06-27 | 2012-01-12 | Bayerische Motoren Werke Aktiengesellschaft | crimp |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT245078B (en) * | 1963-10-24 | 1966-02-10 | Amp Inc | Method for connecting the ferrule part of an electrical connector, in particular a cable lug, to a conductor wire and connector for performing this method |
-
1988
- 1988-01-07 GB GB8800304A patent/GB2202696B/en not_active Expired - Fee Related
- 1988-02-12 DE DE19883804470 patent/DE3804470A1/en not_active Ceased
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5532433A (en) * | 1991-11-13 | 1996-07-02 | Yazaki Corporation | Waterproof-type terminal connection structure and method of producing same |
| US5486653A (en) * | 1993-04-27 | 1996-01-23 | Yazaki Corporation | Crimp-style terminal |
| US20110220385A1 (en) * | 2008-11-18 | 2011-09-15 | Auto Kabel Managementgesellschaft Mbh | Connection of Electrical Cables by Ultrasonic Welding |
| CN102216021A (en) * | 2008-11-18 | 2011-10-12 | 自动电缆管理有限责任公司 | Connection of electrical lines by means of ultrasonic welding |
| CN102216021B (en) * | 2008-11-18 | 2015-10-07 | 自动电缆管理有限责任公司 | Adopt the jockey of electric lead and the purposes of this device of ultrasonic bonding |
| WO2011071188A1 (en) * | 2009-12-09 | 2011-06-16 | Yazaki Corporation | Wire-Equipped Crimp Terminal and Method of Curing Coating Agent |
| US9401549B2 (en) | 2009-12-09 | 2016-07-26 | Yazaki Corporation | Method of curing a coating agent on a crimp terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3804470A1 (en) | 1988-10-06 |
| GB8800304D0 (en) | 1988-02-10 |
| GB2202696B (en) | 1990-12-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20060107 |