JP2005124288A - Terminal connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal connection structure wherein a terminal is easily aligned with a choke coil for precise welding and securing while delamination at a welded part is surely prevented, for improving reliability in electrical connection. <P>SOLUTION: The other end 24e of a terminal 24 is welded and secured to one end 28a of a choke coil 28. After the welded fastening, the one end 28a side of the choke coil 28 is bent in a prescribed direction, to incorporate the terminal 24 and the choke coil 28 into a prescribed position. A gripping part 24f for wrapping and holding one end 28a of the choke coil 28 is provided to the prescribed position of terminal between the welded and fastened position of the terminal 24 and the bending position of the choke coil 28. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a terminal connection structure in which a terminal used for a wiper motor or the like and a choke coil are connected by welding.

  12 to 15 show a terminal connection structure of this type of wiper motor in which a terminal and a choke coil are inserted and assembled from a lateral direction into a connector part integrally formed on the outer surface of the side part of the gear case cover.

  On the outer surface of the side portion 1b of the gear case cover 1 that covers the opening of the gear case (not shown) used for the terminal connection structure of the wiper motor, as shown in FIGS. As shown in FIG.

  Then, as shown in FIGS. 12 and 13 (a) and 13 (b), five conductive terminals 3a, 3b for grounding, signal lines and power supply are provided on the inner surface of the ceiling portion 1a of the gear case cover 1. 3c, 3d, and 3e (generally indicated by reference numeral 3 in FIG. 12) are routed from above, and the bottoms of the connector part 2, that is, the side parts 1b of the gear case cover 1, are formed at five locations in two upper and lower stages The external connection terminals 4a, 4b, 4c, 4d, and 4e (generically indicated by reference numeral 4 in FIG. 12) are inserted into the insertion holes 1c and 1d from the lateral direction so as to protrude into the cylindrical connector portion 2 by a predetermined length. At this time, as shown in FIGS. 14A and 14B, the base end portions 4f of the external connection terminals 4a, 4b, 4c, 4d, and 4e are connected to one end sides of the terminals 3a, 3b, 3c, 3d, and 3e. Each of the crimp portions 3f formed in a curled shape (U-shape) is crimped and electrically connected.

  As shown in FIGS. 12 and 15, a cylindrical magnetic core 6 is provided at each of the other end portions 3g of the power supply terminal 3c, the high-speed drive terminal 3d for signals and the low-speed drive terminal 3e. The one end 7a of the choke coil 7 having a built-in coil is fixed by spot welding (this welding fixed portion is indicated by reference numeral 9 in FIG. 15). The choke coil 7 is a coil for the purpose of blocking a relatively high frequency current and allowing only a direct current or a relatively low frequency current to pass through. The relay terminal 8 is fixed to the other end 7b by spot welding. Has been.

  As shown in FIG. 12, a terminal assembly (terminal assembly part) 5 is constituted by the terminal 3 (3c, 3d, 3e), the choke coil 7 incorporating the magnetic core 6 and the relay terminal 8, and this terminal. When the assembly 5 is assembled by inserting it into the inner surface of the ceiling portion 1a of the gear case cover 1 and the connector portion 2 of the side portion 1b from the lateral direction, the one end portion 7a side of the choke coil 7 is attached to the fulcrum M as shown in FIG. It is bent in the K direction (forming) through the bending direction or bent in the L direction through the fulcrum N so as to be easily incorporated into the ceiling portion 1a of the gear case cover 1.

JP-A-8-275441

JP 2003-111348 A

  However, in the terminal connection structure used in the conventional wiper motor, the shape in which the terminal 3 constituting the terminal assembly 5 and the choke coil 7 are easily welded differs from the shape in which the gear case cover 1 is easily incorporated in the ceiling portion 1a. When the one end 7a side of the choke coil 7 is bent in a predetermined direction after the terminal 3 and the choke coil 7 are fixed by welding, the choke coil 7 is fixed to the other end 3g of the terminal 3 as shown in FIG. The welded portion 9 of the one end portion 7a becomes a bending fulcrum M, N, and a load is directly applied to the welded portion 9 of the one end portion 7a of the choke coil 7, and the welded portion 9 is peeled off from the other end portion 3g of the terminal 3. There was a risk of it. If a defect occurs in this welding fixation, there is a possibility of a conduction failure, and it has been difficult to improve the reliability of electrical connection.

  Moreover, when welding the one end part 7a of the choke coil 7 to the other end part 3g of the terminal 3, it required skill to position and weld both.

  Therefore, the present invention has been made to solve the above-described problems, and can easily position and fix the terminal and the choke coil by welding accurately and reliably prevent the welded portion from peeling off. It is an object of the present invention to provide a terminal connection structure capable of improving the reliability of electrical connection.

  According to the first aspect of the present invention, one end of the choke coil is fixed to one end of both ends of the terminal by welding, and after the welding is fixed, one end of the choke coil is bent in a predetermined direction. In the terminal connection structure in which the terminal and the choke coil are assembled at a predetermined position, one end of the choke coil is located at a predetermined position of the terminal between the welding fixing position of the terminal and the bending position of the choke coil. It is characterized by providing a gripping part for holding the wrapping.

  A second aspect of the present invention is the terminal connection structure according to the first aspect, wherein the grip portion is formed by bending a protruding piece at one end of the terminal into a substantially C shape, and the substantially C shape. It is characterized in that the inner diameter of the gripping portion is formed so as to be larger than the outer diameter of the choke coil.

  As described above, according to the first aspect of the present invention, the grip portion that holds the one end portion of the choke coil at a predetermined position of the terminal between the welding fixing position of the terminal and the bending position of the choke coil is provided. Since one end of the choke coil is welded and fixed to one end of the terminal, when the one end of the choke coil is bent in a predetermined direction, the contact between the terminal grip and the choke coil is bent. Thus, the load is not directly applied to the welded portion at one end of the choke coil, and it is possible to reliably prevent the welded portion from peeling off from one end of the terminal. As a result, the terminal and the choke coil can be fixed in a stable state over time, and it is possible to always maintain a good conductive state, thereby improving the reliability of electrical connection.

  According to the invention of claim 2, the gripping portion is formed by bending the protruding piece at one end of the terminal into a substantially C shape, and the inner diameter of the substantially C-shaped gripping portion is set to the outer diameter of the choke coil. The terminal and the choke coil are welded together by simply inserting one end of the choke coil into the substantially C-shaped gripping part at one end of the terminal. Easy positioning. As a result, the choke coil can be easily and accurately welded and fixed to the terminal without requiring skill.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of a wiper motor according to an embodiment of the present invention, FIG. 2 is a plan view of a gear case cover used in the wiper motor viewed from the inside, and FIG. 3 is integrally formed on the outer surface of a side portion of the gear case cover. 4 is an enlarged sectional view taken along line XX in FIG. 3, FIG. 5 is an enlarged sectional view taken along line YY in FIG. 3, and FIG. 6 is a terminal and choke inside the gear case cover. FIG. 7A is a partial cross-sectional view showing a state before attaching a holder to one end of each terminal routed in the connector portion, FIG. ) Is a partial vertical cross-sectional view showing a state before the holder is mounted, FIG. 8A is a partial cross-sectional view showing a state where the holder is mounted on one end of each terminal, and FIG. 8B is the holder. A partial longitudinal sectional view showing a state of wearing 9 (a) is a side view of the choke coil before bending, FIG. 9 (b) is a plan view before bending, and FIG. 9 (c) is a cross-sectional view taken along line ZZ in FIG. 9 (a). FIG. 10A is a side view after bending the choke coil, FIG. 10B is a plan view after bending, and FIG. 11 is a plan view for explaining the bending state of the choke coil. .

  As shown in FIG. 1, a wiper motor (motor) 10 has an aluminum die-cast gear case 13 coupled to a metal motor case 11 via screws 12A, and an opening 13a of the gear case 13 has an opening 13a. It is covered with a gear case cover 14 made of synthetic resin coupled to the gear case 13 via screws 12B. As shown in FIGS. 1 to 3, a substantially square cylindrical connector portion 15 is integrally formed on the outer surface of the side portion 14 b of the gear case cover 14. A wiper (not shown) is connected to an upper reversal position and a lower reversal position via a crank arm 17 connected to an output shaft 16 rotated by the wiper motor 10 and a link connecting rod (not shown) supported by a ball joint 17a of the crank arm 17. And reciprocating at low speed or high speed.

  As shown in FIG. 2, on the inner surface (lower surface) of the ceiling portion 14a of the gear case cover 14, a conductive terminal 21 for grounding, a conductive terminal 22 for auto-stop circuit (for signal lines), and a conductive terminal 22 for power supply are provided. The high-speed drive (for signal line) conductive terminal 24 and the low-speed drive (for signal line) conductive terminal 25 are routed respectively. Each of these terminals 21, 22, 23, 24, 25 is a long plate so as to extend from a predetermined position on the inner surface of the ceiling portion 14a of the gear case cover 14 to a position protruding into a substantially rectangular tube-shaped connector portion 15 by a predetermined length. And both end sides thereof are bent into a predetermined shape.

  Further, one end portions 21 a, 22 a, 23 a, 24 a, and 25 a of the long terminals 21, 22, 23, 24, and 25 are provided on the bottom surface 15 a (a gear case facing the connector portion 15) of the substantially rectangular tubular connector portion 15. A terminal insertion hole 14c formed in the side portion 14b) of the cover 14 is inserted into the connector portion 15 having a substantially rectangular tube shape to project a predetermined length to form an external connection terminal for the connector. That is, an external connection terminal for a connector is formed integrally with one end 21a, 22a, 23a, 24a, 25a of each long terminal 21, 22, 23, 24, 25.

  Further, as shown in FIGS. 3 to 8, one end portions 21a, 22a, 23a, 24a of the respective long terminals 21, 22, 23, 24, 25 projecting into the substantially square cylindrical connector portion 15 by a predetermined length. , 25a are positioned and fixed in the vertical and horizontal directions via a synthetic resin holder 30 fitted into the connector portion 15 having a substantially square cylindrical shape.

  Further, as shown in FIGS. 4 to 8, a holder 30 is held at the center of the rear part of one end 21 a, 22 a, 23 a, 24 a, 25 a of each long terminal 21, 22, 23, 24, 25. Stopping claws (locking portions) 21b, 22b, 23b, 24b, and 25b are integrally formed and locked to prevent the holder 30 from coming off on both sides of the rear portion of the one end portion 21a, 22a, 23a, 24a, and 25a. Protrusions (locking portions) 21c, 22c, 23c, 24c, and 25c are integrally projected. Further, a positioning recess formed on the inner surface of the ceiling portion 14a of the gear case cover 14 is provided at a predetermined position facing the inner surface of the ceiling portion 14a of the gear case cover 14 of each long terminal 21, 22, 23, 24, 25. Positioning projections 21d, 22d, 23d, 24d, and 25d that are locked to 14d are integrally formed.

  In addition, as shown in FIGS. 2 and 7A, the grounding terminal 21 and the auto-stop terminal 22 are formed of a single conductive metal plate via a plurality of connecting portions (cutting connecting portions) 26. The pair of long terminals 21 and 22 that are integrally formed are routed on the inner surface of the ceiling portion 14a of the gear case cover 14, and the respective one end portions 21a and 22a are held by holders. After being positioned and fixed at 30, the connecting portions 26 can be separated by cutting with a predetermined means.

  Further, as shown in FIGS. 2, 6 and 9 to 11, the other end portions (one end portions) 23e, 24e of the power source terminal 23, the high speed driving terminal 24, and the low speed driving terminal 25 are provided. 25e, one end portion 28a of a choke coil 28 having a cylindrical magnetic core 27 is fixed by spot welding (welding). The choke coil 28 is a coil intended to block a relatively high frequency current and allow only a direct current or a relatively low frequency current to pass through. The relay terminal 29 is fixed to the other end portion 28b by spot welding. Has been. As shown in FIG. 6, a terminal assembly (terminal assembly part) 20 is composed of the terminals 24 (23, 25), the choke coil 28 incorporating the magnetic core 27, and the relay terminal 29.

  As shown in FIGS. 9 to 11, each terminal between the welding fixing position of the other end 23 e, 24 e, 25 e of each terminal 23, 24, 25 and the bending position of the one end 28 a of each choke coil 28. Grasping portions 23f, 24f, and 25f that hold the one end portion 28a of each choke coil 28 so as to be wrapped are integrally formed at the other ends of 23, 24, and 25. As shown in FIG. 9C, the gripping portions 23f, 24f, and 25f are rectangular projecting pieces that are integrally formed on the lower end edges of the other end portions 23e, 24e, and 25e of the terminals 23, 24, and 25, respectively. The C-shaped gripping portions 23f, 24f, and 25f are integrally formed by being bent into a substantially C shape (curled shape), and the inner diameter R of the one end portion 28a of the choke coil 28 is made larger than the inner diameter R of the choke coil 28. Is also formed to have a large diameter (R> r). Then, one end portion 28a of each choke coil 28 is inserted into the gripping portion 23f, 24f, 25f of each terminal 23, 24, 25, and each choke is inserted into the other end portion 24e, 25e, 25e of each terminal 23, 24, 25. The one end portion 28a of the coil 28 is fixed by spot welding, and after this welding fixing, as shown in FIG. 11, the one end portion 28a side of each choke coil 28 is set in a predetermined direction (K direction or L direction). After bending, the terminals 23, 24, 25 and the choke coils 28 are incorporated into the inner surface of the ceiling portion 14 a of the gear case cover 14.

  As shown in FIGS. 3 and 7 (b), a rectangular columnar guide 15b is integrally formed for guiding the holder from the bottom surface 15a of the substantially square cylindrical connector portion 15 toward the opening end 15d. Each corner portion of the bottom surface 15a of the connector portion 15 is integrally formed with a positioning pin 15c whose tip is a triangular pyramid and whose body is a triangular prism.

  As shown in FIGS. 3 to 8, the holder 30 is formed of a synthetic resin in a substantially trapezoidal block shape, and one end portions 21 a and 22 a of the long terminals 21, 22, 23, 24, and 25 thereof. , 23a, 24a and 25a are formed with terminal through holes 31 through which the one end portions 21a, 22a, 23a, 24a and 25a are inserted, respectively, and for guiding the holder of the bottom surface 15a of the connector portion 15 A guide through hole 32 through which the guide 15b is inserted is formed at a position facing the guide 15b. Further, as shown in FIGS. 3, 5, and 6, the corner portions 33 at the four corners of the holder 30 are pressed against the positioning pins 15c of the bottom surface 15a of the connector portion 15 having a substantially rectangular tube shape so that the holder 30 is connected to the connector 30. The inclined surface (chamfered portion) is positioned in the portion 15.

  As shown in FIGS. 7B and 8B, a contactor 18 that rotates together with the output shaft 16 is rotated through a pivot shaft 19 at the approximate center of the inner surface of the ceiling portion 14a of the gear case cover 14. It is supported freely. The contact portion 18a attached to the tip of the contactor 18 comes into contact with the terminals 21, 22, and 23, and the signal and current are supplied to or disconnected from the commutator side of the armature shaft (not shown) of the wiper motor 10 by separating. It has become.

  Next, the terminals 21, 22, 23, 24, and the like are formed in the connector portion 15 integrally formed on the inner surface of the ceiling portion 14 a of the gear case cover 14 of the wiper motor 10 and the outer surface of the side portion 14 b of the gear case cover 14. A case where 25 is assembled will be described.

  As shown in FIGS. 6 and 7 (a), 7 (b), an external portion for the connector extends from a predetermined position on the inner surface of the ceiling portion 14a of the gear case cover 14 to a predetermined protruding position in the connector portion 15 having a substantially rectangular tube shape. Using long terminals 21, 22, 23, 24, 25 integrally formed with one end portions 21a, 22a, 23a, 24a, 25a serving as connection terminals, these long terminals 21, 22, 23, 24, 25 are used. One end portions 21a, 22a, 23a, 24a, 25a of the gear case cover 14 are inserted into the substantially rectangular tube-shaped connector portion 15 from the oblique lateral direction on the inner surface of the ceiling portion 14a of the gear case cover 14, and are inserted into the tubular connector portion 15. Make it protrude long.

  When the terminals 21, 22, 23, 24, 25 are inserted and assembled from the lateral direction into the inner surface of the ceiling portion 14a of the gear case cover 14 and the connector portion 15 of the side portion 14b, as shown in FIG. One end portion 28a side of each choke coil 28 constituting 20 is bent (formed) in the K direction via the fulcrum Q, or is bent in the L direction via the fulcrum S to form the ceiling portion of the gear case cover 14. It is easy to incorporate in 14a.

  When the choke coil 28 is bent on the one end 28a side, as shown in FIG. 11, the contacts 23f, 24f, 25f of the terminals 23, 24, 25 and the contacts of the choke coils 28 are bent at the fulcrum Q. , S, a load is not directly applied to the welded portion 28A of the one end portion 28a of each choke coil 28, and the welded portion 28A is peeled off from the other end portions 23e, 24e, 25e of the terminals 23, 24, 25. This can be surely prevented. Thereby, each terminal 23, 24, 25 and each choke coil 28 can be fixed in a stable state over time, and a good conductive state can always be maintained, and the reliability of electrical connection can be maintained. Can be increased. Further, at the time of welding before the bending process, each choke coil is connected to the substantially C-shaped gripping portions 23f, 24f, 25f at the lower end edges of the other end portions 23e, 24e, 25e of the terminals 23, 24, 25. Each terminal 23, 24, 25 and each choke coil 28 can be easily positioned by a simple operation of inserting only one end portion 28 a of 28. Thereby, each choke coil 28 can be easily and accurately welded and fixed to each terminal 23, 24, 25 without requiring skill.

  Further, one end portions 21 a, 22 a, 23 a, 24 a, 25 a of the long terminals 21, 22, 23, 24, 25 are connected to a substantially square cylindrical connector from an oblique lateral direction on the inner surface of the ceiling portion 14 a of the gear case cover 14. Each of the long terminals 21 and 22 is inserted into a positioning recess 14d formed at a predetermined position on the inner surface of the ceiling portion 14a of the gear case cover 14 when inserted into the cylindrical portion 15 and projected into the cylindrical connector portion 15 by a predetermined length. , 23, 24, 25, positioning protrusions 21 d, 22 d, 23 d, 24 d, 25 d are fitted into the long terminals 21, 22, 23, 24, 25 at predetermined positions on the inner surface of the ceiling portion 14 a of the gear case cover 14. Position and fix.

  Next, as shown in FIGS. 2 and 8 (a) and 8 (b), a holder 30 is fitted into the substantially rectangular tube-shaped connector portion 15 so as to protrude into the rectangular tube-shaped connector portion 15 by a predetermined length. The end portions 21 a, 22 a, 23 a, 24 a, 25 a of the long terminals 21, 22, 23, 24, 25 are positioned and fixed via the holder 30.

  Next, as shown in FIG. 8A, a pair of terminals 21 integrally formed among the long terminals 21, 22, 23, 24, 25 located on the inner surface of the ceiling portion 14 a of the gear case cover 14. , 22 are cut through a predetermined means. Thus, the terminals 21, 22, 23, 24, and 25 are assembled in the connector portion 15 that is integrally formed on the inner surface of the ceiling portion 14a of the gear case cover 14 and the side portion 14b of the gear case cover 14.

  Thus, the end portions 21 a, 22 a, 23 a, 24 a, 25 a of the long terminals 21, 22, 23, 24, 25 are formed in a substantially rectangular tube shape from the oblique lateral direction on the inner surface of the ceiling portion 14 a of the gear case cover 14. After inserting the connector portion 15 into the connector portion 15, the connector portion 2 is formed on the outer surface of the side portion 1 b of the conventional gear case cover 1 because the holder 30 is fitted into the substantially rectangular tube-shaped connector portion 15. Compared with the terminal connection structure having a protrusion, assembly workability can be further improved.

  In addition, five terminals 21, 22, 23, 24, and 25 that are routed at predetermined positions on the inner surface of the ceiling portion 14a of the gear case cover 14 are substantially squares that are integrally formed on the outer surface of the side portion 14b of the gear case cover 14. Each of the long terminals 21, 22, 23, 24, 25 is formed in a long length up to a position that protrudes a predetermined length in the tubular connector portion 15, and protrudes a predetermined length in the substantially square tubular connector portion 15. Since the one end portions 21a, 22a, 23a, 24a, 25a are integrated with one end side of each of the long terminals 21, 22, 23, 24, 25 as external connection terminals for connectors, the side of the conventional gear case cover 1 Compared to the terminal connection structure in which the connector part 2 is provided on the outer surface of the part 1b, the number of parts can be reduced and the cost can be reduced. Furthermore, up and down and left and right directions of one end portions 21a, 22a, 23a, 24a, and 25a of five long terminals 21, 22, 23, 24, and 25 projecting into the substantially square cylindrical connector portion 15 by a predetermined length. Can be accurately positioned and fixed easily via the holder 30 fitted in the substantially square tube-shaped connector portion 15, and the holder 30 from the substantially square tube-shaped connector portion 15 can be fixed. Can be prevented, and the reliability of electrical connection can be improved.

  In addition, according to the said embodiment, although the terminal connection structure of the wiper motor was demonstrated, of course, the said embodiment is applicable to motors other than a wiper motor.

It is a side view of the wiper motor of one embodiment of the present invention. It is the top view which looked at the gear case cover used for the said wiper motor from the inner side. It is a front view of the connector part integrally formed by the outer surface of the side part of the said gear case cover. It is an expanded sectional view which follows the XX line in FIG. It is an expanded sectional view which follows the YY line in FIG. It is a longitudinal cross-sectional view which shows the state just before attaching a terminal and a choke coil inside the said gear case cover. (A) is the fragmentary cross-sectional view which shows the state before attaching a holder to the one end part of each terminal routed in the said connector part, (b) is the fragmentary longitudinal cross-sectional view. (A) is a partial cross-sectional view showing a state where a holder is attached to one end of each terminal, and (b) is a partial vertical cross-sectional view thereof. (A) is a side view before bending of the choke coil, (b) is a plan view thereof, and (c) is a cross-sectional view taken along the line ZZ in FIG. (A) is a side view of the choke coil after bending, and (b) is a plan view thereof. It is a top view explaining the state of the bending process of the said choke coil. It is sectional drawing which shows the state before attaching a terminal and a choke coil inside the gear case cover used for the wiper motor of a prior art example. (A) is a partial cross-sectional view showing a state before each external connection terminal is mounted on the connector portion of the gear case cover of the conventional example, and (b) is a partial vertical cross-sectional view thereof. (A) is a partial cross-sectional view showing a state in which each external connection terminal is attached to the connector portion of the gear case cover of the conventional example, and (b) is a partial vertical cross-sectional view thereof. It is a top view explaining the state of the bending process of a choke coil after welding of a terminal and a choke coil of the above-mentioned conventional example.

Explanation of symbols

14 Gear case cover (predetermined position)
23, 24, 25 Terminals 23a, 24a, 25a One end 23e, 24e, 25e The other end (one end)
23f, 24f, 25f Holding part 28 Choke coil 28a One end R Inner diameter of holding part r Outer diameter of choke coil

Claims (2)

One end of the choke coil is fixed to one end of the both ends of the terminal by welding, and after the welding is fixed, the one end of the choke coil is bent in a predetermined direction to form the terminal and the choke coil. In the terminal connection structure that is built in the predetermined position,
A terminal connection structure characterized in that a holding portion is provided at a predetermined position of the terminal between a welding fixing position of the terminal and a bending position of the choke coil so as to wrap one end of the choke coil. The terminal connection structure according to claim 1,
The grip portion is formed by bending a protruding piece at one end of the terminal into a substantially C shape, and the inner diameter of the substantially C shape grip portion is larger than the outer diameter of the choke coil. A terminal connection structure characterized by being formed as described above.

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