JP2008010341A - Terminal joining method and terminal joining structure, and seat belt retractor and seat belt device having the terminal joining structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal joining method and a terminal joining structure wherein a power supply terminal of a motor and a connecting terminal of a harness can be joined without giving thermal influence on the motor, and to provide a seat belt retractor and a seat belt device having the terminal joining structure in which durability of a joint part can be improved more. <P>SOLUTION: In this terminal joining method and this terminal joining structure, the connecting terminal 4 of the harness 3 is diagonally fixed by a pedestal 5 against the power supply terminal 2 of the motor 1, and the power supply terminal 2 and the connecting terminal 4 are joined by resistive welding. A protrusion 21b of the connecting terminal 4 is arranged so as to be contacted with the power supply terminal 2, and the resistive welding is carried out by contacting an electrode 31 for the resistive welding from the rear faces of the connecting terminal 4 and the power supply terminal 2. At this time, the arrangement direction Y-Y of the protrusion 21b and the extension direction Z-Z of the power supply terminal 2 are made to be nearly coincident. The motor 1 having such a terminal joining structure, for example, is used for the seat belt retractor 41 or the seat belt device 51. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and a structure for joining a power feeding terminal of a motor and a joining terminal of a harness, and a seat belt retractor and a seat belt device, and more particularly, a terminal suitable for a small motor used for a motor retractor of an electric seat belt. The present invention relates to a joining method, a terminal joining structure, and a seat belt retractor and a seat belt apparatus having the terminal joining structure.

  6A and 6B are diagrams showing a conventional terminal joining method for a motor used in a seat belt retractor (motor retractor for an electric seat belt), where FIG. 6A is a harness before joining, and FIG. 6B is a harness after joining. Is shown.

  As shown in FIG. 6A, the motor 61 is housed in the body casing 62 and the lid member 63. Note that the rotation shaft of the motor 61 protrudes from the end opposite to the lid member 63. The lid member 63 is formed with a notch 63a, and the plus-side and minus-side power supply terminals 64 are exposed to the outside from the notch 63a. Further, the lid member 63 is formed with two restraining portions 63 b for fixing the harness 65 at two locations in a direction orthogonal to the arrangement of the power supply terminals 64. The restraining portion 63b is composed of a flange member 63k formed on the lid member 63 and wall members 63w disposed on both sides of the flange member 63k.

  As shown in FIG. 6B, the harness 65 is brought from above the lid member 63, and is arranged so as to reach the power supply terminal 64 clockwise via the restraining portion 63b. The tip of the harness 65 and the power supply terminal 64 are joined by a predetermined tab terminal 66. The tab terminal 66 has a portion covering the power supply terminal 66 and a portion into which the tip of the harness 64 is inserted, and each portion is crimped by a predetermined tool and joined to the power supply terminal 64 and the harness 65.

  Further, Patent Document 1 (Japanese Patent Laid-Open No. 2005-297777: webbing take-up device) states that “an electric harness 52 for driving a motor is wound around the base plate 54, and the electric harness 52 is further connected to the motor 44. Is connected to the power supply terminal 56 provided in the main body portion by a crimp terminal structure (see paragraph [0032] and FIG. 4). Although a detailed description of the crimp terminal structure is not described, as far as FIG. 4 is referred to, when the screw terminal is provided on the cover motor 58 and the cover motor 58 is mounted on the motor 44, the power supply terminal 56 and the terminal are connected. The base is configured to be electrically connected, and a round or groove terminal is connected (crimped) to the tip of the electrical harness 52, and the terminal is placed on the terminal base and connected by tightening a screw. I guess that.

  In the terminal joining method described in FIG. 6 and Patent Document 1 described above, both are mechanical joining by pressure bonding, and there is a limit to the durability of the joint as compared with welding, brazing, soldering, or the like. However, when connecting the power feeding terminal of the motor and the connection terminal of the harness, the joining method such as welding has a large thermal influence on the inside of the motor, and the joining method cannot be simply switched.

Here, Patent Document 2 (Japanese Utility Model Laid-Open No. 5-72050: Resistance welding terminal) states that “a flat plate welding having a connection portion for an electric wire on one side and a resistance welding projection for the other side terminal on the other side. There is disclosed a resistance welding terminal in which a plurality of resistance welding projections are formed in a regular polygonal shape on the welded portion. 1). The resistance welding terminal described in Patent Document 2 has protrusions arranged in a regular polygon shape for the purpose of contact stability and splash splash prevention (see paragraph [0007]). Uses a wire harness connection terminal for automobiles, and an output electric wire such as a sensor is connected to the crimping piece 13 ”(see paragraph [0003]). It is necessary to consider the thermal effects during resistance welding after connecting these parts by resistance welding and then connecting the harness and wires separately to the necessary parts such as sensors. There is no.
JP 2005-297777 A Japanese Utility Model Publication No. 05-72050

  The present invention has been devised in view of the above-described problems, and can connect the power feeding terminal of the motor and the connection terminal of the harness without causing a thermal effect on the motor, thereby further improving the durability of the joint. It is an object of the present invention to provide a terminal joining method and a terminal joining structure that can be improved, and a seat belt retractor and a seat belt device having the terminal joining structure.

  According to the present invention, a terminal joining method for joining a power supply terminal of a motor and a connection terminal of a harness, wherein a plurality of protrusions are formed on a surface of the power supply terminal or the connection terminal, and the protrusions are used as counterpart terminals A terminal joining method is provided, which is arranged so as to be in contact and subjected to resistance welding. The protrusions may be formed along a predetermined arrangement direction, and the arrangement direction and the extending direction of the power supply terminals may be substantially matched. Further, the arrangement direction may be set to a direction that substantially coincides with the extending direction of the power supply terminals when the harness is arranged on the motor at a predetermined attachment angle.

  According to the present invention, there is also a terminal joint structure for joining the power feeding terminal of the motor and the connection terminal of the harness, the connection terminal being fixed obliquely with respect to the power feeding terminal, and the connection terminal and the power feeding terminal. Are joined by resistance welding, and a terminal joint structure is provided. The harness may be fixed to an end portion of the motor by a pedestal having a gate portion that bundles a plurality of the harnesses and a passage portion that supports the harness at a predetermined height.

  According to the present invention, in a seat belt retractor comprising a spool that winds up a seat belt and a motor that rotates the spool, a terminal that joins a power supply terminal of the motor and a connection terminal of a harness that transmits power to the motor. The joint structure is provided with a seat belt retractor in which the connection terminal is fixed obliquely with respect to the power supply terminal, and the connection terminal and the power supply terminal are joined by resistance welding. The harness may be fixed to an end portion of the motor by a pedestal having a gate portion that bundles a plurality of the harnesses and a passage portion that supports the harness at a predetermined height.

  Further, according to the present invention, the seat belt that restrains the occupant, the seat belt retractor that winds up the seat belt so that the seat belt can be pulled out, the tongue that is slidably supported by the seat belt, and the vehicle body structure are fixed. In the seatbelt device provided with the buckle that can be engaged with the tongue, the seatbelt retractor includes a spool that winds up the seatbelt, and a motor that rotates the spool, and the power supply terminal of the motor and the motor A terminal joint structure for joining a connection terminal of a harness for power transmission is characterized in that the connection terminal is fixed obliquely to the power supply terminal, and the connection terminal and the power supply terminal are joined by resistance welding. A seat belt device is provided. The harness may be fixed to an end portion of the motor by a pedestal having a gate portion that bundles a plurality of the harnesses and a passage portion that supports the harness at a predetermined height.

  According to the terminal joining method of the present invention described above, by providing a plurality of projections on the harness junction terminals, the contact area between the terminals can be reduced, and the pressure and resistance during resistance welding are concentrated around the projections. Can be made. Therefore, compared with the case where there is no projection, the pressurizing load and current amount during resistance welding can be reduced, and the thermal influence and damage to the motor can be avoided. In addition, resistance welding can be stably employed in the connection between the motor power supply terminal and the harness connection terminal, and a stronger bond can be obtained compared to mechanical bonding such as crimping, and durability can be improved. It can be improved further.

  Further, according to the terminal joint structure of the present invention, in a limited shape and space of joining the power feeding terminal of the motor and the joint terminal of the harness, it is easy to handle the harness, and the assembly accuracy can be improved. The stress applied to the harness and the joint can be relaxed, and the durability can be further improved.

  Furthermore, according to the seat belt retractor and the seat belt apparatus of the present invention, since the terminal joining structure of the present invention is adopted, the life of the seat belt retractor and the seat belt apparatus can be further extended.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a diagram showing a terminal connection structure of the present invention, (A) is a side view, (B) is a top view, and FIG. 2 is a perspective view showing a connection terminal used in the terminal connection method of the present invention. FIG. 3 is a diagram showing a resistance welding process of the terminal connection method of the present invention.

  In the terminal connection structure shown in FIGS. 1A and 1B, the connection terminal 4 of the harness 3 is obliquely fixed to the power supply terminal 2 of the motor 1 by a pedestal 5, and the power supply terminal 2 and the connection terminal 4 are resistance-welded. Are joined together.

  The motor 1 is accommodated in the body casing 11 and the lid member 12. The cover member 12 is formed with a notch 12a, and the plus-side power supply terminal 2a and the minus-side power supply terminal 2b are exposed to the outside from the notch 12a. Such a motor 1 is used for motors, such as a seatbelt retractor, for example.

  The harness 3 is an electric wire that sends electricity to the motor 1, and the plus-side harness 3a is connected to the plus-side feeding terminal 2a, and the minus-side harness 3b is connected to the minus-side feeding terminal 2b. The plus side harness 3a and the minus side harness 3b are guided to the motor 1 from the same direction by the pedestal 5, and are branched on the pedestal 5 into a plus side and a minus side as shown in FIG.

  The connection terminal 4 is a so-called round terminal, and is fixed by being crimped to the tip of the harness 3. As shown in FIG. 2, the connection terminal 4 includes a flat plate portion 21 that forms a joint portion with the power supply terminal 2 and a crimping portion 22 that is joined to the harness 3. The connection terminal 4 is not limited to the illustrated round terminal, and various types such as a groove-type terminal and a square terminal can be used.

  The flat plate portion 21 is formed with a round hole 21a penetrating through the central portion. In general, in the case of a round terminal, a round hole 21a is formed so that it can be inserted into a screw-clamped type terminal block. However, in the present invention, since the round hole 21a is not used, the round hole 21a is formed in the flat plate portion 21. A non-type may be adopted. On the surface of the flat plate portion 21, two protrusions 21b and 21b arranged in a predetermined direction are formed. These protrusions 21b and 21b are formed along an arrangement direction YY that forms a predetermined angle α with respect to the center line XX of the connection terminal 4 (the direction in which the harness 3 extends). The angle α is determined by the mounting angle of the harness 3 with respect to the motor 1. That is, as shown in FIG. 1A, when the harness 3 is fixed to the base 5 and joined to the power supply terminal 2, the arrangement direction YY of the protrusions 21 b is the extension direction ZZ of the power supply terminal 2. Are almost identical. The height and diameter of the protrusion 21b are determined from conditions such as the resistance value of the flat plate portion 21, the pressure load during resistance welding, and the current value. As shown in the figure, when the protrusions 21b are provided at two places, the diameter of the protrusions 21b is set to 30 to 40% with respect to the diameter of the flat plate portion 21, and the height of the protrusions 21b is set to 20 with respect to the diameter of the protrusions 21b. Preferably, the height is about%. For example, when the flat plate portion 21 has a diameter of 7.5 mm and the round hole 21a has a diameter of 3.3 mm, the plate is formed with a height of 0.3 mm and a diameter of 1.5 mm.

  Further, the protrusions 21 b and 21 b may be formed not on the connection terminal 4 but on the power supply terminal 2 of the motor 1. In this case, the protrusions 21b and 21b have the arrangement direction YY substantially coincided with the extending direction ZZ of the power supply terminal 2, and the intervals at which the protrusions simultaneously contact the flat plate portion 21 of the joining terminal 4 (in other words, And an interval larger than the diameter of the round hole 21a and smaller than the diameter of the flat plate portion 21).

  The crimping portion 22 includes a front crimping portion 22a to be crimped to the exposed wire of the harness 3, and a rear crimping portion 22b to be crimped to the harness 3 at a portion covering the wire. In addition, although what used the open | release both ends of the front crimping | compression-bonding part 22a and the back crimping | compression-bonding part 22b is used here, it is not limited to this, Of course, a cylindrical thing may be employ | adopted. It is.

  The pedestal 5 includes a gate portion 5a that bundles the plus-side harness 3a and the minus-side harness 3b, and a passage portion 5b that supports the plus-side harness 3a and the minus-side harness 3b at a predetermined height. It is installed at the top.

  The gate portion 5a is provided on each of the two struts 5c and 5c erected on the pedestal 5 with a gap through which at least one harness 3 can pass, and on each upper portion of the face of the strut 5c facing each other. It consists of stoppers 5d and 5d. The stopper 5d is disposed at a height that allows at least two harnesses 3 (that is, the plus-side harness 3a and the minus-side harness 3b) to pass through the gap between the columns 5c and 5c. In addition, what is necessary is just to arrange | position the stopper 5d to the height which can pass the one harness 3 when the clearance gap between the support | pillars 5c is set to the width | variety which can pass the two harnesses 3. FIG.

  The passage portion 5b is formed by a wall portion 5e and a column 5c that are erected on the pedestal 5. The plus-side harness 3a and minus-side harness 3b passed through the gate portion 5a are bifurcated at the wall portion 5e and guided to predetermined power supply terminals 2a and 2b. The height at which the passage portion 5 b is arranged varies depending on the type and size of the motor 1, the thickness of the harness 3, etc., but here the tip of the harness 3 (connection terminal 4) is approximately 45 ° with respect to the power supply terminal 2. The contact height is set at an angle of. A groove corresponding to the passage portion 5b may be formed on the side surface of the pedestal 5, and a protrusion that functions as a stopper may be provided in a part of the groove.

  By installing the pedestal 5, the harness 3 can be supported at a predetermined mounting angle and a plurality of harnesses 3 can be bundled. Therefore, the harness 3 can be fixed with a simple structure, and the harness 3 can be easily handled, so that the assembling accuracy can be improved and the stress applied to the harness 3 and the joint can be reduced. Can do. The pedestal 5 may be molded integrally with the lid member 12, or after being molded with another member, the pedestal 5 is fixed to the lid member 12 with an adhesive or an engagement structure (combination of hooked projections and engagement holes). May be. Further, when the harness 3 is fixed, the cable holder 6 may be used together. By using the cable holder 6, the harness 3 can be prevented from being twisted.

  Next, the terminal joining method of the present invention will be described. In the terminal joining method of the present invention, the harness 3 and the power feeding terminal 2 of the motor 1 are joined using the joining terminal 4 shown in FIG. 2, and the joining terminal 4 and the power feeding terminal 2 are directly connected by resistance welding. To be joined. At this time, as shown in FIG. 3, the protrusion 21 b of the joining terminal 4 is disposed so as to contact the power feeding terminal 2, and the resistance welding electrode 31 is brought into contact with the joining terminal 4 and the back surface of the power feeding terminal 2, And applying a predetermined current. At this time, the arrangement direction YY of the protrusions 21b and the extending direction ZZ of the power supply terminal 2 are substantially matched. Note that “substantially coincident” means that the protrusions 21b do not have to be completely coincident with each other as long as they are in contact with the surface of the power supply terminal 2.

  According to the terminal joining method described above, the contact area between the joining terminal 4 and the power feeding terminal 2 can be reduced, and the nugget can be stably formed by concentrating the pressurizing load and resistance at the time of resistance welding around the protrusion 21b. The thermal influence on the inside of the motor can be avoided, and damage to the motor can be prevented. Therefore, it is possible to obtain a stronger bond as compared with a conventional mechanical bond such as a pressure bonding, and to further improve the durability.

  Various processes other than the resistance welding process can be considered, and any of the following methods may be employed. For example, (1) after attaching the body casing 11, the lid member 12, and the pedestal 5 to the motor 1, the joint terminal 4 is resistance-welded to the power supply terminal 2, and the harness 3 is crimped to the joint terminal 4 and fixed to the pedestal 5. (2) The body casing 11, the lid member 12, and the base 5 are attached to the motor 1, the joint terminal 4 is crimped to the harness 3, the joint terminal 4 is resistance-welded to the power supply terminal 2, and the harness 3 is attached to the base 3. (3) The body casing 11, the lid member 12, and the pedestal 5 are attached to the motor 1, the joining terminal 4 is crimped to the harness 3 and fixed to the pedestal 5, and the joining terminal 4 is connected to the feeding terminal 2. For example, a resistance welding method may be considered.

  Next, a seat belt retractor and a seat belt device using the terminal joining structure described above will be described. Here, FIG. 4 is a front view showing the seat belt retractor of the present invention, and FIG. 5 is an overall schematic diagram of the seat belt apparatus of the present invention.

  As shown in FIG. 4, the seat belt retractor 41 of the present invention includes a spool 43 that winds up the seat belt 42 and a motor 1 that rotates the spool 43, and a harness that transmits power to the power supply terminal 2 of the motor 1 and the motor 1. In the terminal joint structure for joining the three connection terminals 4, the connection terminals 4 are fixed obliquely to the power supply terminals 2, and the connection terminals 4 and the power supply terminals 2 are joined by resistance welding. The harness 3 is fixed to a pedestal 5 connected to an end of the motor 1 opposite to the rotating shaft 1a. As shown in FIG. 1, the pedestal 5 has a gate portion 5a for bundling the harness 3. And a passage portion 5b for supporting the harness 3 at a predetermined height. The terminal joint is covered and protected by a rubber or plastic cover 44, and the harness 3 is finally connected to a vehicle battery (not shown) so that it can transmit power to the motor 1. .

  The spool 43 has a power transmission means 45 connected to an end portion on the same side as the rotating shaft 1a of the motor 1 and a lock means 46 connected to an end portion on the opposite side. The power transmission means 45 incorporates a gear mechanism (not shown) connected to the rotating shaft 1 a of the motor 1, and decelerates the driving force of the motor 1 and transmits it to the spool 43. A spring means 47 containing a spring (not shown) for urging the spool 43 in the direction of winding the seat belt 42 is provided outside the power transmission means 45. The lock means 46 is a means for preventing the spool 43 from rotating in the direction in which the seat belt 42 is pulled out when a large deceleration greater than a predetermined deceleration occurs during a collision or the like. A deceleration sensing means (vehicle sensor) for operating the locking means may be provided in the vicinity of the locking means 46. The seat belt retractor 41 may be provided with a pretensioner that operates in an emergency and winds up the seat belt 42 to fix the occupant.

  The spool 43, the motor 1, the power transmission means 45, and the lock means 46 are connected to and integrated with a frame 48 having a substantially U-shaped cross section. Further, a frame cover 48a is connected to a portion of the frame 48 where the seat belt 42 is wound, so that a winding space is secured. Although the spring type retractor using the spring means 47 for winding the seat belt 42 in an emergency has been described with reference to FIG. 4, it is possible to cope with an emergency by using only the motor 1 without using the spring means 47. Of course, it may be a motor type retractor.

  Thus, if the terminal joining structure concerning the motor 1 of the seat belt retractor 41 is adopted, a strong joining can be obtained without damaging the inside of the motor 1, which is called joining of the feeding terminal 2 and the joining terminal 4. In a limited shape and space, the harness 3 can be easily handled, the assembling accuracy can be improved, the stress applied to the harness 3 and the joint can be relaxed, and the durability can be further improved. In other words, the life of the seat belt retractor 41 can be extended.

  As shown in FIG. 5, the seat belt device 51 of the present invention is supported by a seat belt 42 that restrains an occupant, a seat belt retractor 41 that winds up the seat belt 42 so that it can be pulled out, and a seat belt 42 that is slidable. The tongue 52 and the buckle 53 engageable with the tongue 52 are provided, and the seat belt retractor 41 employs the one shown in FIG. That is, the seat belt retractor 41 includes a spool 43 that winds up the seat belt 42 and a motor 1 that rotates the spool 43, and joins the power supply terminal 2 of the motor 1 and the connection terminal 4 of the harness 3 that transmits power to the motor 1. In the terminal joining structure, the connection terminal 4 is fixed obliquely with respect to the power supply terminal 2, and the connection terminal 4 and the power supply terminal 2 are joined by resistance welding. The details of the seat belt retractor 41 are as described above, and therefore, a duplicate description is omitted. The seat belt retractor 41 is accommodated in a vehicle seat 54. The seat belt 42 is wound around a guide anchor 55 fixed to a vehicle body (not shown), and the front end of the seat belt retractor 41 is secured to the vehicle body or vehicle seat by the belt anchor 56. 54.

  Thus, if the motor 1 having such a terminal connection structure is adopted for the seat belt retractor 41 of the seat belt device 51, in addition to the above effects, the life of the entire seat belt device 51 can be extended. The installation location and specific shapes of the seat belt 42, the tongue 52, the buckle 53, the vehicle seat 54, the guide anchor 55, and the belt anchor 56 are not limited to those illustrated, Any shape is acceptable.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, such as the protrusion 21b may be formed of a protrusion group having a plurality of small protrusions. is there.

It is a figure which shows the terminal connection structure of this invention, (A) is a side view, (B) is a top view. It is a perspective view which shows the connection terminal used with the terminal connection method of this invention. It is a figure which shows the resistance welding process of the terminal connection method of this invention. It is a front view which shows the seatbelt retractor of this invention. 1 is an overall schematic view of a seat belt device of the present invention. It is a figure which shows the conventional terminal joining method of the motor used for an electric seatbelt, (A) is before joining of a harness, (B) has shown after joining of a harness.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 1a Rotating shaft 2 Power supply terminal 2a Positive side power supply terminal 2b Negative side power supply terminal 3 Harness 3a Positive side harness 3b Negative side harness 4 Junction terminal 5 Base 5a Gate part 5b Passage part 5c Post 5d Stopper 5e Wall part 11 Body casing 12 Lid member 12a Notch portion 21 Flat plate portion 21a Round hole 21b Protrusion 22 Crimp portion 22a Front crimp portion 22b Back crimp portion 31 Electrode 41 Seat belt retractor 42 Seat belt 43 Spool 44 Cover 45 Power transmission means 46 Lock means 47 Spring means 48 Frame 48a Frame cover 51 Seat belt device 52 Tongue 53 Buckle 54 Vehicle seat 55 Guide anchor 56 Belt anchor 61 Motor 62 Trunk casing 63 Lid member 63b Restraining part 63k Ling member 63w Wall member 64 Conductive terminals 65 connected to the terminal

Claims (7)

  A terminal joining method for joining a power supply terminal of a motor and a connection terminal of a harness, wherein a plurality of protrusions are formed on a surface of the power supply terminal or the connection terminal, and the protrusions are arranged so as to contact a counterpart terminal. A terminal joining method characterized by applying resistance welding.   2. The terminal joining method according to claim 1, wherein the protrusion is formed along a predetermined arrangement direction, and resistance welding is performed by substantially matching the arrangement direction and the extending direction of the power supply terminal. .   The terminal according to claim 2, wherein the arrangement direction is set to a direction substantially coincident with an extending direction of the power supply terminal when the harness is arranged on the motor at a predetermined mounting angle. Joining method.   A terminal joining structure for joining a power supply terminal of a motor and a connection terminal of a harness, wherein the connection terminal is fixed obliquely with respect to the power supply terminal, and the connection terminal and the power supply terminal are joined by resistance welding. A terminal junction structure characterized by that.   The said harness is being fixed to the edge part of the said motor with the base which has the gate part which bundles the said several harness, and the channel | path part which supports the said harness with predetermined | prescribed height. The terminal junction structure described. In a seat belt retractor comprising a spool for winding a seat belt and a motor for rotating the spool,
6. The seat belt retractor according to claim 4, wherein a terminal joint structure for joining the power feeding terminal of the motor and a connection terminal of a harness that transmits power to the motor has the terminal joint structure according to claim 4 or 5. A seat belt that restrains an occupant, a seat belt retractor that winds up the seat belt so that the seat belt can be pulled out, a tongue that is slidably supported by the seat belt, and a buckle that is fixed to a vehicle body structure and engageable with the tongue In a seat belt device comprising:
The seat belt retractor according to claim 6, wherein the seat belt retractor is the seat belt retractor.