JP2009040385A - Method of connecting seat belt winding motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of connecting a seat belt winding motor capable of easily and quickly performing solid resistance welding having high non-destructive strength in an even metal structure without requiring skill in the work, capable of preventing disorder in winding condition of a structural conductor narrow wire of an electric wire due to uneven melting of the electric wire near the resistance welding part, and capable of finishing well in appearance near the resistance welding part of the electric wire without lowering strength of the electric wire itself. <P>SOLUTION: When a width at a right angle against the axial direction of a contact recessed surface 7 formed in an upper electrode 6 in the axial direction of an electric wire 3 is L and a vertical distance between a contact surface 7a of the upper electrode 6 with a motor terminal 2 and the deepest part of the contact recessed surface 7 is H, H and L are formed to satisfy a formula H/L=0.2-0.4. Further, the contact recessed surface 7 is arranged to be brought in contact with a release surface 3b over a resistance welding part 15 of the electric wire 3 to the motor terminal 2 in the axial direction of the electric wire 3, and formed to be gradually separated from the release surface 3b in the outside of both ends of the resistance welding part 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for connecting a seat belt wrapping motor, and more particularly to a method for connecting a seat belt wrapping motor for connecting a motor terminal of a seat belt wrapping motor to an electric wire.

For cruise control to achieve safe driving of the vehicle, the vehicle speed is controlled so that the distance between the vehicle and the preceding vehicle is maintained at a preset reference value. A vehicle speed / inter-vehicle distance control function equipped with a laser beam radar is provided. Furthermore, in recent years, instead of this laser beam radar, an advanced vehicle speed / inter-vehicle distance control function (hereinafter abbreviated as IHCC) equipped with a millimeter-wave radar that has little propagation loss due to rain and fog and does not deteriorate the detection function even under bad weather is used. It has come to be.
This type of IHCC incorporates a rear-end collision braking system (CMBS) and a pretensioner, and if the preceding vehicle is not detected within 100 m ahead of the traveling vehicle by the millimeter wave radar, the vehicle is controlled by the IHCC. The vehicle runs at a constant speed at a set speed preset by the driver.

  On the other hand, when the preceding vehicle is detected within 100 m ahead of the traveling vehicle by the millimeter wave radar, the vehicle speed of the preceding vehicle is detected by IHCC, and the vehicle speed of the preceding vehicle is slower than the set speed of the vehicle that follows the vehicle. In such a case, the throttle and brake are adjusted by the IHCC, and the vehicle is decelerated and controlled so as to avoid a rear-end collision with the preceding vehicle. When it is determined that there is a risk of a rear-end collision due to a sudden braking operation of the preceding vehicle or an interrupted vehicle, an alarm sound and a display alarm are generated by the IHCC control, and a seat belt entrainment motor of the pretensioner Is activated, and the seat belt of the driver's seat is lightly pulled in several times, and a bodily sensation alarm is issued to urge the driver to perform an emergency brake operation.

Furthermore, if it is determined that it is difficult to avoid a rear-end collision by the driver's brake operation, the seat belt retractor motor is urgently driven by the IHCC control, and the seat belts in the driver's seat and the passenger seat are pulled in strongly. The seat belt wearer is strongly restrained by safety, and at the same time, the automatic sudden braking is driven by the IHCC control.
In this way, under circumstances where it is difficult to avoid a rear-end collision, the safety restraint for the rear-end collision of the seat belt wearer is performed under the control of the IHCC, and the automatic sudden braking is activated to synergize with the driver's own brake operation. Due to the effect, a rear-end collision mitigation control operation that significantly reduces the relative speed during rear-end collision is performed.

At the time of the seat belt retracting operation by the seat belt retracting motor of the IHCC pretensioner described above, first, a prior sensation alarm is surely given to the driver. If a situation where it is difficult to avoid a rear-end collision occurs, the seat belt is engulfed quickly and securely, and the seat belt wearer is safely restrained and held, and suddenly It is necessary that the rear-end collision mitigation control under the brake drive is reliably performed.
For this purpose, it is required that the pretensioner's winding motor should operate steadily and adequately in response to impacts caused by sudden fluctuations in the vehicle's running vibration and vehicle speed in the event of an emergency. The motor terminal of the seat belt retractor motor is firmly connected to the energization line that supplies power to the seat belt retractor motor without breaking the connection due to vehicle running vibration, impact due to sudden fluctuations in vehicle speed, and other emergency impacts. Is required to be connected.

Conventionally, a method of using a printed circuit board has been basically used for connection between various motors and energization wires for supplying power to the motors. In the method of using this printed circuit board, a current-carrying wire is soldered to one end of a predetermined chip of the printed circuit board, and the motor terminal of the motor is inserted into a mounting hole provided in the printed circuit board at the other end position of this chip. Was soldered to the other end of the chip.
In addition, a connection method that does not use a printed circuit board is also used. In this case, the terminal of the motor and the terminal crimped to the energizing wire are connected by resistance welding. In this conventional method, a crimping terminal is crimped to the connection end of the conducting wire, and the crimping terminal and the motor terminal are sandwiched by two electrodes, and instantaneously through the contact resistance of the crimping terminal and the motor terminal. The current-carrying wire and the motor terminal are welded and connected via a crimping terminal by Joule heat generated by passing a large current through.

In the connection method of the motor terminal and the energization line using the printed circuit board described above, a printed circuit board is separately required and the number of parts is increased, resulting in a complicated configuration. In soldering, the composition of the solder and the flux can be changed. In addition, it is necessary to select appropriately according to the material of the motor terminal and adjust the amount of flux according to the welding conditions, and skill level is required to achieve accurate soldering, and processing time is also required It becomes long and efficient processing is difficult.
On the other hand, the conventional connection between the motor terminal and the conducting wire by resistance welding requires a separate crimping connection of the crimping terminal to the conducting wire, which is complicated and requires a processing time for the crimping process. If this is not performed correctly, there is a problem that complete resistance welding cannot be performed.

  The present invention has been made in view of the current state of the connection method between the motor terminal and the energization wire as described above, and its purpose is to easily and quickly with a work that does not require a degree of skill, and with a uniform metal structure. It is possible to perform resistance welding in a solid state with high strength, and there is little disturbance in the winding state of the thin conducting wire due to melting disturbance of the conducting wire in the vicinity of the resistance weld, and the strength of the conducting wire itself is also reduced It is another object of the present invention to provide a seatbelt winding motor connection method capable of finely finishing the appearance of the vicinity of the resistance welding portion of the energized wire.

  In order to achieve the above-mentioned object, when a collision occurrence situation is predicted in a running vehicle, the vehicle seat belt is engulfed and driven, so that a seat belt wearer can feel alarm and hold safety restraint. 2. The seat belt winding motor according to claim 1, wherein the seat belt winding motor connects the motor terminal of the seat belt winding motor to an energization line that supplies power to the seat belt winding motor. A first step of arranging the connection peripheral surface of the conductive wire on the connection surface of the motor terminal, a second step of arranging the lower electrode on the back surface of the connection surface of the motor terminal, and a first step The upper electrode formed with a contact concave surface in the axial direction of the conductive wire on the release peripheral surface facing the connection peripheral surface of the conductive wire arranged in contact with the motor terminal connection surface is opened to the contact concave surface. A third screw that is placed with its faces facing each other And a pressing force that presses the energizing wire against the motor terminal is applied to the upper electrode, a welding voltage is applied between the upper electrode and the lower electrode, and a welding current flowing through the energizing wire and the motor terminal is allowed to flow. A fourth step of resistance welding the electric wire to the motor terminal, L being a width perpendicular to the axial direction of the concavity concave surface formed in the axial direction of the conducting wire, and the confronting surface of the upper electrode and the motor terminal And H / L = 0.2 to 0.4, where H is the vertical distance from the deepest part of the contact concave surface.

In the first invention, in the first step, the connection peripheral surface of the conducting wire is disposed on the connection surface of the motor terminal of the seat belt winding motor, and in the second step, the back surface of the connection surface of the motor terminal. In the third step, the lower electrode is disposed in contact with the connection peripheral surface of the conductive wire that is disposed on the connection surface in the first step. The upper electrode on which the contact concave surface is formed is arranged with the release peripheral surface in contact with the contact concave surface.
In the fourth step, a pressing force for pressing the energizing wire against the motor terminal is applied to the upper electrode, a welding voltage is applied between the upper electrode and the lower electrode, and a welding current flowing through the energizing wire and the motor terminal is passed. As a result, the motor terminal of the seat belt retracting motor is resistance-welded to the energizing wire. In this case, the width perpendicular to the axial direction of the contact concave surface formed in the axial direction of the energization line is L, and the vertical distance between the contact surface of the upper electrode and the motor terminal and the deepest portion of the contact concave surface is H. The contact concave surface is formed so that H / L = 0.2 to 0.4.
For this reason, in the first aspect of the present invention, in a state where a curved surface having a shape suitable for welding is formed on the peripheral surface of the conductive wire on the motor terminal arranged on the lower electrode, the work does not require skill. The motor terminal of the seat belt winding motor is simply and quickly resistance-welded in a solid state with a uniform metal structure and high fracture strength.

  In the second invention, the contact concave surface formed on the upper electrode in the first invention is disposed in contact with the release surface of the conductive wire across the resistance welding portion between the conductive wire and the motor terminal in the axial direction of the conductive wire. The outer surface of the resistance welded portion is formed so as to gradually dissociate from the release surface.

  In the second invention, in addition to the action of the first invention, the contact concave surface formed on the upper electrode is a release surface of the conducting wire across the resistance welding portion between the conducting wire and the motor terminal in the axial direction of the conducting wire. Is arranged so as to be gradually dissociated from the release surface at both ends outside of the resistance welded portion, so that the configuration of the conducting wire is disturbed by the melted disturbance of the conducting wire near the resistance welded portion. This reduces the strength of the current-carrying wire itself and the appearance of the current-carrying wire near the resistance weld.

According to the first invention, in the first step, the connection peripheral surface of the conductive wire is disposed in contact with the connection surface of the motor terminal of the seatbelt winding motor, and in the second step, the connection surface of the motor terminal In the third step, the lower electrode is disposed in contact with the back surface, and in the third step, on the open peripheral surface facing the connection peripheral surface of the conductive line disposed in contact with the connection surface in the first step, in the axial direction of the conductive line. The upper electrode on which the contact concave surface is formed is disposed with the release peripheral surface facing the contact concave surface.
Then, in the fourth step, a pressing force for pressing the energizing wire against the motor terminal is applied to the upper electrode, a welding voltage is applied between the upper electrode and the lower electrode, and a welding current passing through the energizing wire and the motor terminal is passed. As a result, it is possible to easily and quickly resistance-weld the motor terminal of the seatbelt winding motor and the conducting wire with a uniform metal structure without requiring skill in the work.
In this case, the width perpendicular to the axial direction of the contact concave surface formed in the axial direction of the energization line is L, and the vertical distance between the contact surface of the upper electrode and the motor terminal and the deepest portion of the contact concave surface is H. Since the contact concave surface is formed so as to be H / L = 0.2 to 0.4, the shape of the contact wire is suitable for the circumferential surface of the conducting wire arranged on the lower electrode by the contact concave surface. A curved surface is formed, and the resistance welded portion between the motor terminal of the seat belt winding motor and the conducting wire is more firmly formed with a uniform metal structure, and the tensile fracture strength of the resistance welded portion can be greatly increased.

  According to the second invention, in addition to the effects obtained by the first invention, the concavity concave surface formed on the upper electrode has a conductive wire extending in the axial direction of the conductive wire over the resistance welding portion with the motor terminal of the conductive wire. Since the outer surface of the mutual resistance weld is formed so as to be gradually dissociated from the release surface at the outer end of the mutual resistance welded portion, at the position near the both ends of the resistance connecting portion during resistance welding, The disturbance of the winding state can be reduced, the strength of the conducting wire itself can be eliminated, and the appearance of the connection portion of the resistance welding portion with the conducting wire can be finished beautifully.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an explanatory view showing the overall configuration of the present embodiment, FIG. 1 (a) is an explanatory view before resistance welding, FIG. 1 (b) is an explanatory view at the time of resistance welding, and FIG. It is explanatory drawing which shows the structure of the principal part of a form, FIG. 2 (a) is explanatory drawing before resistance welding, FIG.2 (b) is sectional explanatory drawing at the time of resistance welding.

  According to the present embodiment, as already described, the motor terminal of the seat belt winding motor that is incorporated in the pretensioner that is interlocked with the rear-end collision reduction brake and drives the seat belt to wind up supplies power to the seat belt winding motor. A connection method of the seat belt winding motor according to the present embodiment will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1 (a), in the first step, the connection peripheral surface 3 a of the energization wire 3 is disposed on the connection surface 2 a of the motor terminal 2 of the seat belt retractor motor 1.
In the figure, reference numeral 5 denotes a rotation shaft of the seat belt winding motor 1, and this rotation shaft 5 is connected to a seat belt (not shown) via a transmission mechanism (not shown). When the seatbelt of the driver's seat is slightly pulled and driven several times in order to urge emergency brake operation and a sensory alarm is issued or it is difficult to avoid a rear-end collision, the seatbelt entrainment motor 1 drives the wearer. The seat belt is strongly retracted, and a safety restraining operation for restraining the wearer safely is performed.

In the second step, the lower electrode 4 is disposed in contact with the back surface 2 b of the connection surface 2 a of the motor terminal 2.
By the way, as shown in FIG. 1A, an upper electrode 6 is disposed opposite to the energization line 3 disposed on the connection surface 2a of the motor terminal 2, and the lower surface of the upper electrode 6 is in contact with the lower surface. Concave surface 7 is formed in the axial direction of the conducting wire. An air cylinder 8 is disposed above the upper electrode 6. When high-pressure air is introduced from the pressure hole 11 of the air cylinder 8 as indicated by an arrow A, the pressure shaft 10 of the air cylinder 8 is set. Is configured to be driven downwardly. Between the upper electrode 6 and the lower electrode 4, a welding power source 14 and a switch 13 in an open state when not welded are connected in series.

  In the third step, high-pressure air A for setting the resistance welding preparation state is introduced into the air cylinder 8 from the pressure hole 11 of the air cylinder 8, and the upper electrode 6 is moved by the pressure shaft 10 in the air cylinder 8. A pair of the upper electrode 6 and the open peripheral surface 3b facing the connection peripheral surface 3a with the motor terminal 2 of the conducting wire 3 which is gradually pushed down and arranged in contact with the connection surface 2a of the motor terminal 2 in the first step. The contact concave surface 7 is brought into a contact state, and a resistance welding preparation state is set.

In the fourth step, in the resistance welding preparation state set in the third step, adjustment is performed so that the pressure of the high-pressure air A introduced from the pressurizing hole 11 of the air cylinder 8 is gradually increased. A pressure of 80 kg / cm ² is applied to the conducting wire 3 by the shaft 10 through the upper electrode 6 to set a pressurized state.
Then, after the 80 kg / cm ² pressure state is maintained for 0.1 sec, the switch 13 is turned ON, and a welding voltage of 3.5 V is applied between the upper electrode 6 and the lower electrode 4, and 80 kg / cm ^The welding current 8000A is allowed to flow for 0.2 sec through the current-carrying wire 3 and the motor terminal 2 that are in contact with each other in a pressurized state of 2.
After the energization time of 0, 2 sec has elapsed, as indicated by the arrow D in FIG. 1B, the switch 13 is turned off and the energization is interrupted, but 80 kg / cm ² is applied for 0, ² sec after the energization interruption. The pressure state is maintained as it is, and 0.2 seconds have elapsed after the switch 13 is turned off, the lid 12a is released, the high pressure air in the air cylinder 8 is released from the release hole 12, and the pressurized state is released. The Then, the conductive wire 3 and the motor terminal 2 that are resistance welded to each other are removed from the upper electrode 6 and the lower electrode 4 to complete the resistance welding.

In this way, in the present embodiment, with the pressurized state of 80 kg / cm ² , the conduction wire 3 and the conductive wire 3 are generated by Joule heat generated under the conditions of a welding resistance value R = 0.45 mΩ and a welding current I = 8000 A. The contact portion of the motor terminal 2 is melted and pressed by pressure to perform resistance welding. In the present embodiment, as shown in FIG. 2A, a concavity concave surface 7 in the axial direction of the conducting wire 3 is formed on the surface of the upper electrode 6 facing the conducting wire 3 disposed on the motor terminal 2. A width perpendicular to the axial direction of the contact concave surface 7 is defined as L, and a vertical distance between the contact surface 7a of the upper electrode 6 with the motor terminal 2 and the deepest portion of the contact concave surface 7 is defined as H / L = 0.2 to 0.4 is selected.
Further, in the present embodiment, as shown in FIG. 2B, the contact concave surface 7 formed on the upper electrode 6 is resistance welded to the motor terminal 2 of the conducting wire 3 in the axial direction of the conducting wire 3. It is formed so as to come into contact with the release surface 3b over the portion 15 and to gradually dissociate from the release surface 3b outside both ends in the axial direction of the resistance welding portion 15.

  In general, a configuration in which a large number of conductive thin wires such as copper wires are bundled as the conducting wire 3 is used, and in this embodiment, 37 copper thin wires with a vinyl-coated diameter of 0.26 mm are bundled, The thing of the structure wound helically with the comparatively long period in the axial direction of the electricity wire 3 was used. In this way, in the conductive wire 3 having a configuration in which a bundle of conductor thin wires is spirally wound in the axial direction, when a tensile force is applied in the axial direction, the conductor thin wires are pivoted due to the spiral configuration of the conductor thin wire bundle. A component force that presses at right angles to the core direction is generated, and a current carrying wire structure with high pressure resistance against tensile fracture can be obtained.

By the way, the shape of the contact concave surface 7 of the upper electrode is such that the conductive wire 3 and the motor terminal 2 formed by bundling the thin conductor wires can be easily and quickly made by a uniform metal structure easily and quickly by work that does not require skill. Resistance welding so as to have excellent fracture resistance, and further, the disturbance of the winding state of the conductor thin wire of the conductive wire 3 due to the melting turbulence of the conductive wire 3 in the vicinity of the resistance weld 15 is reduced, and the strength of the conductive wire 3 itself This is an important condition for eliminating the decrease and finely finishing the appearance of the conductive wire 3 in the vicinity of the resistance welded portion 15. As the shape of the concavity concave surface 7 of the upper electrode 6, if H shown in FIG. 2A is too small relative to L, the conductive wire 3 becomes more crushed during resistance welding, and the motor terminal 2 of the conductive wire 3. However, the spiral winding state of the conductive thin wire constituting the conductive wire 3 is greatly broken at the position of the end portion in the axial direction of the resistance welding portion 15, and the strength of the conductive wire 3 itself is reduced. At the same time, sufficient resistance against breakage is not obtained in the resistance welded portion 15, and the appearance of the conducting wire 3 at the end position is not finished cleanly.
On the other hand, if H is too large with respect to L, the degree of crushing of the conducting wire 3 due to the pressing force of the upper electrode 6 is reduced, the contact resistance increasing region is reduced, and the rigid resistance welded portion 15 cannot be obtained.

Therefore, the inventors, as described above, for a plurality of cases in which the H / L values are changed, the welding voltage is 3.5 V, the pressing force is 80 kg / cm ² , the welding resistance value is R = 0.45 mm, and the welding current is I = 8000 A. With resistance welding, the tensile strength is increased with respect to the resistance welded body between the current-carrying wire 3 and the motor terminal 2 obtained, and the fracture strength is 20 kg / cm ² or more. The range of H / L was selected based on experiments.
According to the experiments by the inventors, when H / L = 0.15, when the tensile force is 14 kg / cm ² , the conductive wire 3 breaks near the end of the resistance weld 15 and H / L = 0.5. Then, when the tensile force became 16 kg / cm ² , the conductive wire 3 was broken in the vicinity of the resistance weld 15. On the other hand, at H / L = 0.19 to 0.4, it was confirmed that the resistance welded body 15 between the obtained conducting wire 3 and the motor terminal 2 has a breaking strength of 20 kg / cm ² or more. It was done.
Based on these experimental results and various data obtained by the inventors' long-term research on resistance welding, a condition of H / L = 0.2 to 0.4 is required between H and L. It was derived.

  As described above, in the present embodiment, the width perpendicular to the axial direction of the contact concave surface 7 formed on the upper electrode 6 in the axial direction of the conducting wire 3 is L, and the motor terminal 2 of the upper electrode 6 The vertical distance between the contact surface 7a and the deepest portion of the contact concave surface 7 is H, and H / L = 0.2 to 0.4. The release surface 3b is disposed so as to be in contact with the motor terminal 2 of the conductive wire 3 over the resistance welding portion 15 in the axial direction, and is formed so as to gradually dissociate from the release surface 3b outside both ends of the resistance welding portion 15. For this reason, according to the present embodiment, the resistance welded portion 15 between the motor terminal 2 of the seatbelt retractor motor 1 and the conducting wire 3 is easily and quickly destroyed by a uniform metal structure by work that does not require skill. In addition to being able to be formed in a strong state with high strength, near the end of the resistance connecting portion 15 during resistance welding, there is less disturbance in the winding state of the constituent conductor thin wires of the conducting wire 3, and the conducting wire 3 itself The strength of the conductive wire 3 is not reduced, and the appearance of the conductive wire 3 near the resistance weld 15 can be finely finished.

  It is explanatory drawing which shows the whole structure of one embodiment of this invention.   It is explanatory drawing which shows the structure of the principal part of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat belt winding motor 2 Motor terminal 2a Connection surface 3 Conductive wire 3a Connection peripheral surface 3b Release peripheral surface 4 Lower electrode 6 Upper electrode 7 Concave concave surface 8 Air cylinder 10 Pressurizing shaft 14 Welding power source

Claims (2)

When a collision occurrence is predicted for a running vehicle, a seat belt retracting motor that performs a sensible alarm and safety restraint for the seat belt wearer by driving the seat belt of the vehicle to be wound. Is a connection method of the seat belt winding motor that connects the motor terminal to an energization line that supplies power to the seat belt winding motor,
A first step of arranging a connection peripheral surface of the energization wire on a connection surface of a motor terminal of the seat belt winding motor;
A second step of placing a lower electrode in contact with the back surface of the connection surface of the motor terminal;
An upper electrode in which a concavity concave surface is formed in an axial direction of the energization wire on an open circumferential surface facing the connection circumferential surface of the energization wire disposed in contact with the motor terminal connection surface in the first step. A third step of placing the release peripheral surface in contact with the contact concave surface;
Applying a pressing force that presses the energizing wire against the motor terminal to the upper electrode, applying a welding voltage between the upper electrode and the lower electrode, and causing a welding current to flow through the energizing wire and the motor terminal. And a fourth step of resistance welding the conductive wire to the motor terminal,
The distance perpendicular to the axial direction of the contact concave surface formed in the axial direction of the conducting wire is L, and the vertical distance between the contact surface of the upper electrode with the motor terminal and the deepest portion of the contact concave surface And H / L = 0.2 to 0.4, and a method for connecting a seat belt winding motor, wherein H / L is 0.2 to 0.4. In the connection method of the seatbelt winding motor of Claim 1,
The concavity concave surface is in contact with the release surface over the resistance welded portion between the current-carrying wire and the motor terminal in the axial direction of the current-carrying wire, and gradually dissociates from the release surface outside both ends in the axial direction of the resistance-welded portion. A method for connecting a seatbelt winding motor, characterized in that:

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