JPH047016Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is used for a seat belt device for protecting an occupant in a vehicle emergency, and particularly relates to a seat belt device in which webbing is automatically attached to an occupant when the occupant gets into the vehicle.

[Background Art] In a seat belt device, a webbing for restraining an occupant is attached to the occupant, and the webbing is used to restrain the occupant in the event of a vehicle emergency.

In order to automatically attach the webbing to the occupant after the occupant gets on the vehicle, one end of the webbing is attached to the door, and the webbing is driven in response to opening and closing of the door to attach and release the webbing to the occupant. A seat belt device has been proposed (see Japanese Utility Model Publication No. 58-54278). In this seat belt device, one end of the spiral spring is connected to the webbing take-up shaft, and the other end is locked to a spring case that houses the spiral spring. It is biased towards.

Engagement teeth are formed on the outer periphery of this case, and the engagement teeth engage with the drive member. The drive member is configured to reciprocate along a guide rail provided inside the door in conjunction with opening and closing of the door.

In the seat belt device, when the door is opened, the drive member moves along the guide rail so as to rotate the spring case in a direction that reduces the webbing winding force caused by the spiral spring. Thereby, the door can be opened with a small webbing winding force due to the spiral spring.

On the other hand, in the door closing operation, the driving member moves along the guide rail in a direction opposite to the moving direction so as to rotate the spring case in a direction that increases the webbing take-up force by the spiral spring. This prevents the seat belt from sagging when the door is closed.

However, in the above-mentioned seat belt device, the spring case is rotated in a predetermined direction as the door is opened, and as the spring case is rotated, the end of the spiral spring that is locked in the spring case is gradually rotated around the webbing take-up axis. Therefore, the biasing force of the spiral spring against the webbing take-up shaft in the webbing take-up direction gradually decreases as the amount of opening of the door increases. Incidentally, the force required to open the door is greatest at the initial stage of opening the door when it is in a stationary state. That is, the above-mentioned seat belt device has a problem in that the biasing force of the spiral spring is greatest at the beginning of opening the door, which requires the greatest force, resulting in poor operability when opening the door.

Further, when the door is opened, the spring case is rotated in a direction opposite to the predetermined direction in conjunction with the opening of the door, and as the spring case is rotated, the end of the spiral spring that is locked in the spring case is moved to the webbing take-up shaft. Since the webbing is gradually moved in the circumferential direction, the urging force exerted by the spiral spring on the webbing take-up shaft in the webbing take-up direction gradually decreases as the amount of opening of the door increases. Therefore, when the door is fully opened or partially opened, there is a problem in that the webbing becomes slack, making it difficult for the occupant to get on and off the vehicle smoothly.

Furthermore, in the seat belt device, the biasing force of the spiral spring in the webbing winding direction is greatest at the beginning of opening the door as described above.
There is a problem in that when the door is opened, the webbing that moves due to this opening slides against the occupant's body at the beginning of the movement.

In addition, in a seat belt device of the type that moves an anchor according to the opening and closing of the door, Utility Model Publication No. 55-94255,
JP-A-55-63932 and JP-A-55-19663 have been proposed.

[Purpose of the invention] Taking the above facts into consideration, the present invention provides a seat belt device that has a webbing attached to the door at one end, and the webbing is automatically attached to and released from the occupant in response to opening and closing of the door. In addition, it is possible to sufficiently reduce the opening resistance force of the door from the initial stage of opening the door, suppress the slack of the webbing that occurs when the door is changed from the open state to the closed state, and reduce the friction between the webbing and the occupant when the webbing is moved. The aim is to obtain a seat belt device that is capable of reducing forces.

[Summary of the invention] The seat belt device according to the invention includes a webbing for restraining an occupant, which has one end attached to a door and moves as the door is opened and closed, and a take-up shaft to which the other end of the webbing is attached and which winds the webbing. , an elastic body connected at one end to the take-up shaft and urging the take-up shaft in the webbing winding direction; and a winder to which the other end of the elastic body is attached and increases the webbing winding force by the elastic body. A rotating member rotatably supported in a force increasing direction and in a winding force decreasing direction in which the webbing winding force by the elastic body is decreased, a door opening/closing detection means for detecting opening/closing of a door, and the door opening/closing detection means When the closed state of the door is detected, the rotating member is placed in the first state in which it is rotated by the maximum amount in the direction of increasing the winding force, and the door opening/closing detection means changes the door from the closed state to the open state. The rotating member is placed in the second state in which it is rotated by the maximum amount in the direction of reducing the winding force when it is detected that the winding force is reduced, and the rotating member is rotated until the door opening/closing detection means detects the fully open state of the door. is held in the second state, and when the door opening/closing detection means detects the fully open state of the door, the rotating member is rotated to move at least the webbing between the first state and the second state. The present invention is characterized in that it has a control means for arranging the rotating member in a third state in which it does not sag and maintaining the rotating member in the third state until the closed state of the door is detected.

In the above invention, when the closed state of the door is detected by the door opening/closing detection means, the control means places the rotating member in the first state in which it is rotated by the maximum amount in the direction of increasing the winding force. Thereby, the webbing can be wound up by the winding shaft with a strong winding force, so that the webbing can be tightly attached to the occupant.

Further, when the door opening/closing detection means detects that the door in the closed state is opened, the rotating member is arranged in a second state in which the rotating member is rotated by the maximum amount in the direction of reducing the winding force by the control means; The pivot member is held in the second state until a fully open state of the door is detected. Therefore, at the initial stage of opening the door, the resistance force against opening the door can be sufficiently suppressed, so that the door can be opened easily.

Furthermore, when the fully open state of the door is detected by the door opening/closing detection means, the control means rotates the rotating member so that at least a third state in which the webbing does not slacken between the first state and the second state is caused. The rotating member is held in the third state until the closed state of the door is detected. Therefore,
It is possible to suppress the webbing from sagging when the door is fully open or half open, allowing the occupant to get on and off smoothly.

[Embodiment of the invention] FIG. 1 shows an automobile to which a seat belt device according to the present embodiment is applied. In this embodiment, the shoulder webbing 10 is automatically attached to the occupant seated on the seat 12.

That is, the outer end of the shoulder webbing 10 is secured to the rear upper part of the door 16 via the shoulder anchor 14, and the inner end of the shoulder webbing 10 is attached to the floor 18 in the center of the vehicle as a winding means. It is wound onto the device 20. This shoulder anchor 14 can be attached to the shoulder webbing 10 as needed.
It can be structured so that it can be attached and detached.

Further, a wrap webbing 22 is arranged on the floor portion 18 of the seat 12 on the outside of the vehicle, so that the occupant can wear it as necessary. This lap webbing has two tongue plates at the tip.
4 is attached, and its base is wound up by a biasing force onto a winding device 26 attached to the floor section 18. A buckling device 28 is attached to the inside of the seat 12 in correspondence with the tongue plate 24, and as shown in FIG. By pulling out and engaging the tongue plate 24 with the buckle device 28, the wrap webbing 22 can be attached. The take-up device 26 has a built-in inertia lock mechanism that instantly stops drawing out the wrap webbing 22 in case of a vehicle emergency.

Next, the winding device 20 will be explained according to FIGS. 3 to 7.

In this webbing retractor 20, the frame 11
2 is fixed to the floor part 18 with mounting bolts 114.

A pair of leg plates 11 are visible from both sides of the frame 112.
8 and 120 extend parallel to each other.

A winding shaft 122 is attached to these leg plates 118 and 120.
The winding shaft 11 is pivotally supported near both ends of the winding shaft 11.
One end of the shoulder webbing 10 is locked to the center of the shoulder webbing 2 and wound in layers.

An inertia lock mechanism 126 is attached to the outside of the leg plate 120 between it and the winding shaft 122.
This inertia lock mechanism 126 has a generally used structure, and detects the acceleration of the vehicle body or the acceleration of pulling out the shoulder webbing 10, and suddenly stops the webbing pulling rotation of the take-up shaft 122 in the event of a vehicle emergency. There is.

A plate-shaped holder 128 is fixed to the outside of the leg plate 118 with screws 130. A small diameter portion 132 formed at the end of the winding shaft 122 is attached to this plate-shaped holder 128.
The spring case 134, which serves as a rotating member, is pivotally supported at the distal end of the spring case 134 by its bottom plate.
This spring case 134 is connected to the small diameter part 132 by a stopper 136 that is press-fitted into the tip of the small diameter part 132.
Extraction from the file is blocked.

Further, this spring case 134 has a worm wheel 138 carved on its outer circumference, and the outer end of a mainspring spring 140 as an elastic body is locked on its inner circumference. This mainspring spring 140 is arranged coaxially with the small diameter portion 132, and its inner end is locked to the small diameter portion 132. Therefore, the mainspring spring 140 applies a winding force for the webbing 10 to the winding shaft 122, and when the spring case 134 is rotated in the direction d in FIG. The gripping force is increased, and conversely, when the webbing is rotated in the direction D in FIG. 4, the webbing winding force is decreased.

A worm gear 142 that meshes with the worm wheel 138 is pivotally supported by a bracket 148 of the holder 128 via a guide 144 and a shaft 146, as shown in FIG. That is, a guide 144 is fixed to an axially intermediate portion of a shaft 146 whose both ends are pivotally supported by a bracket 148, and rotates together with the shaft 146. The outer shape of this guide 144 is shown in FIG. It has a rectangular shape. A rectangular hole that fits into the guide 144 is provided protruding from the axial center of the worm gear 142 . Therefore, the worm gear 142 rotates together with the guide 144 and the shaft 146, but is relatively movable in the axial direction.

This relative movement is restricted by a large diameter portion 144A formed at one end of the guide 144 in the axial direction, that is, movement in the direction in which the worm gear 142 receives the reaction force of the mainspring spring 140 via the spring case 134. has been done. Also the guide 144
This large diameter portion 14 is connected via a worm gear 142 to
Actuator 150 is located near the end opposite to 4A.
is pivoted. As shown in FIG. 6, the actuator 150 has a circular hole through which the guide 144 passes, and is thereby able to rotate relative to the guide 144. Further, a compression coil spring 152 is interposed between the actuator 150 and the bracket 148 of the holder 128 and is pressed against the worm gear 142.
42 and can move in the axial direction of the shaft 146 by receiving the reaction force of the mainspring spring 140.

4 and 5 show a state in which the worm gear 142 and the actuator 150 have moved until they come into contact with the large diameter portion 144A, and the winding force by the mainspring spring 140 is in a weak state. On the contrary, FIG. 7 shows a state in which the coil has moved the maximum amount in the opposite direction against the biasing force of the compression coil spring 152, and the winding force by the mainspring spring 140 is in a strong state. (The winding force is sufficient to keep the webbing 10 in close contact with the occupant 30 without receiving a great pressure from the webbing 10.) When the actuator 150 is located between FIG. 4 and FIG. 7, winding is performed by the mainspring spring 140. The force is medium.

As shown in FIG.
4 and is attached to the opposite side of the plate-shaped holder 128 with a screw 156.
It corresponds to 58,159. These limit switches 158 are turned off when they are separated from the actuator 150, and turned on when they are in contact with the leg portion 150A of the actuator 150. Therefore, the limit switch 158 is turned off when the winding force is strong as shown in FIG. 4, and turned on when the winding force is weak as shown in FIG. 7. Conversely, the limit switch 159 is turned on when the winding force is strong as shown in FIG. When the winding force is medium, both limit switches 158 and 159 are turned off.

A small gear 160 is fixed to the shaft 146 near the large diameter portion 144A, and this small gear 160 meshes with a large gear 162. This large gear 162 is fixed to an output shaft 166 of a motor 164 which is fixed to the plate-shaped holder 128.

Next, FIGS. 8 and 9 show door opening detection means 170 as door opening/closing detection means for detecting the opening degree of the door 16. As shown in FIGS. A hinge 172 is fixed to the vehicle front end of the inner panel 16A of the door 16, and this hinge 172 is pivotally supported by a hinge 176 via a pin 174. This hinge 1
76 is fixed to the front pillar 178, the door 16 can be rotated via the pin 174 from the closed state shown by the solid line in FIG. 8 to the fully open state shown by the half-open state shown by the dashed line. There is.

A bracket 180 is fixed to the front pillar 178, and an arm 184 is fixed to the front pillar 178 by a pin 182.
is pivoted. This arm 184 extends into the door 16 through an opening 186 formed in the inner panel 16A, and a checker 188 is attached near the tip. This checker car 18
8 is the door 16 when the door 16 is wide open.
The function is to limit the opening angle of the door 16 by coming into contact with a portion of the door 16, or to apply a rotational resistance force to the door 16 at a predetermined opening angle of the door 16 by coming into contact with a spring member (not shown) attached to the door 16. have.

This checker 188 is provided with a contactor 190 shown in FIG. 9, which is biased toward a metal detection plate 192 fixed to the door 16 and slides with the detection plate 192 during movement. .
The checker 188 and the detection plate 192 are connected to a control unit 196 (FIG. 11) as a control means via wires 193 and 194, respectively.
Therefore, the resistance value between the wirings 193 and 194 can be detected linearly and continuously from the fully closed state to the fully open state of the door 16, as shown in FIG. Therefore, the resistance value regions A, B, and C are respectively set when the door 16 is fully closed and when the door 16 is fully closed.
It is designed to be able to distinguish between half open and fully open.

In the control circuit shown in FIG. 11, a control unit 196 centered on a microcomputer drives the motor 164 via a power supply circuit 198.

The outputs of the limit switches 158, 159 already described are transmitted to this control unit 196.

This control unit 196 controls the motor 164 so that when the door 16 is opened from the closed state, the tension of the webbing 10 is kept in a weak state, which is extremely small or zero, until the door 16 is in the half-open state. Further, the tension of the webbing 10 is maintained at a moderate level while the door 16 changes from a half-open state to a fully open state and vice versa in response to the closing operation of the door 16. Prevents necessary sagging. Further, after the door 16 is closed, the motor 164 is driven to increase the winding force of the webbing 10, thereby bringing the webbing 10 into a strong state that brings the webbing 10 into close contact with the occupant.

The operation of this embodiment configured as described above will be described in the 12th section.
This will be explained with reference to the flowchart shown in the figure.

At step 200 in FIG. 12A, it is determined whether the door 16 is open or closed. If the door 16 is closed as shown in FIG. 2, the process proceeds to step 202 in FIG. 12C. In step 202, it is determined whether or not the tension of the webbing 10 is strong.

While the door 16 remains closed,
Since the occupant needs to wear the webbing 10 relatively tightly, the tension of the webbing 10 needs to be strong. This strong state is detected by turning on limit switch 158 in FIG. 4, and the process returns to step 200 in FIG. 12A.

If the limit switch 158 is not turned on, this is detected because the limit switch 158 is turned off, and in step 204 the motor 164 rotates in the direction of increasing the tension on the webbing 10. Then, in step 206, the door 16 is opened again.
If the door 16 remains closed, it is determined again in step 208 whether the tension of the webbing 10 is high. If the tension of the webbing 10 is not strong, the process returns to step 204; if the tension is strong, the motor 164 is stopped in step 210, and the process returns to step 200.

If the door is not closed in step 206, that is, if the door 16 is open, it is detected by the door opening detection means 170, and if the door 16 is half open, the motor 164 is stopped in step 212. Thereafter, the process returns to step 202, and if the door 16 is fully open, the motor 164 is stopped in step 214, and then the process proceeds to step 216.

If a half-open state of the door is detected in step 200 of FIG.
Proceed to 18. This door open/close state is determined by a signal from the door opening detection means 170. If it is determined in step 218 that the tension in the webbing 10 is weak, that is, if the limit switch 159 in FIG. 4 is turned on, the process returns to step 200.

However, when the door 16 is opened to a half-open state in order for the passenger to exit the vehicle, the webbing 10 is pulled out from the take-up device 20 as the door 16 opens in a circular motion, so the tension of the webbing 10 increases. , the limit switch 159 is turned off. When it is detected in step 218 that the tension is not weak, the motor 164 rotates in a direction to weaken the winding force of the mainspring spring 140 in step 220.

Thereafter, in step 222, the open/closed state of the door 16 is determined again, and if the door 16 is still in the half-open state, it is determined again in step 224 whether the tension of the webbing 10 is in a weak state. If it is not in the weak state, the process returns to step 220, and if it is in the weak state, the motor 164 stops in step 226 and then returns to step 200.
Return to.

Therefore, the tension of the webbing 10 is made weak at the initial stage of opening the door 16, and the occupant does not feel pressured. This eliminates tension and allows the door to be opened comfortably. If it is determined in step 222 that the door 16 is in the closed or fully open state, that is, if the occupant closes the door 16 again or opens it from the half-open state to the fully open state, the motor is activated in steps 228 and 230, respectively. 16
4 is stopped, the process proceeds to steps 202 and 216.

When the door 16 is opened from the half-open state to the fully open state, it is determined in step 216 of FIG. 12D whether the tension of the webbing 10 is moderate. When the door 16 is fully open, the tension of the webbing 10 is medium, and when the door 16 is fully open, the webbing 10 is relatively slack.
It is necessary to make it easier for the occupant to get on and off the vehicle by putting the passenger in a somewhat tense state as shown in FIG.

This moderate tension in the webbing 10 is detected by the fact that neither limit switch 158, 159 in FIG. 4 is turned on, and the process proceeds to step 200. However, if the limit switch 158 is turned on, step 23
Since this is determined in step 234 and it is found that the tension of the webbing 10 is strong, step 234 is performed.
The motor 164 rotates in the direction of reducing the winding force.

Thereafter, the open/closed state of the door 16 is determined again in step 236, and if the door 16 is still fully open, the webbing is re-aligned in step 238.
It is determined whether the tension at 0 is medium or not. If it is not medium, the process returns to step 234, and if it is medium, the motor 164 is activated in step 240.
After the process is stopped, the process returns to step 200. Further, if it is detected in step 236 that the door 16 is partially open or closed, that is, if the occupant
When the motor 164 is moved from a fully open state to a half open state or a closed state, the motor 164 is stopped in steps 242 and 244, respectively, and then steps 216 and
Return to 202.

If the tension of the webbing 10 detected in step 232 is not in a strong state, that is, if the limit switch 158 is turned off, the motor 164 is activated to release the mainspring spring 14 in step 246.
It rotates in the direction of increasing the winding force of 0. Thereafter, in step 248, the open/closed state of the door is determined again. If the door 16 is still fully open, it is determined in step 250 whether the tension of the webbing 10 has reached a medium level. If the tension has not yet reached a medium level, return to step 246; if the tension has reached a medium level, proceed to step 240.
leading to. Further, if the door 16 is detected in step 248 as being half-open or closed, that is, if the door 16 is moved to the half-open or closed state after the motor 164 is rotated in the direction of increasing the winding force in step 246, steps 250, 252 to step 216 and 202, respectively.

In this way, if the door 16 is moved to the half-open state after the passenger gets on board, the tension of the webbing 10 becomes weak again, and the passenger can comfortably and automatically put on the webbing 10. When the door 16 is closed, the webbing 10 is wound up to a certain extent, and the tension of the webbing 10 becomes strong, so that the webbing 10 is brought into close contact with the occupant.

If necessary, in order to relieve the feeling of pressure on the occupant while driving, a timer or the like is used to adjust the tension of the webbing 10 after a predetermined period of time has passed after the door 16 is closed, to such an extent that there is no large gap between the webbing 10 and the occupant. It can also be reduced to

Next, FIG. 13 shows door opening detection means 300 used in a second embodiment of the present invention. The arm 184 in this embodiment has an extension 302 at the end opposite the checker 188.
2 slides in contact with a detection plate 304 attached to the front pillar 118.

The tip of this extension 302 and the detection plate 304 are connected to the control unit via wiring 193, 194, as in the previous embodiment. Therefore, similarly to the embodiment described above, the resistance value between the wirings 193 and 194 is linearly connected and detected.

In the above embodiment, limit switches 158, 1 for detecting the tension of the webbing 10 are used.
59 is used, and when both of these are off, it is detected that the tension of the webbing 10 is moderate, but as shown by the limit switch 158A shown by the imaginary line in FIG. 4th limit switch for
It may be arranged between the limit switches 158 and 159 shown in the figure. Furthermore, in the present invention, it is not necessary to detect the tension of the webbing 10. That is, depending on the degree of opening of the door 16, the motor 164
The winding force of the mainspring spring 140 may be rotated by a predetermined amount in the direction of decreasing or increasing the winding force of the mainspring spring 140. In the above embodiment, the degree of opening of the door is set to three levels: fully open, half open, and fully closed, but it can be further classified as necessary.

Furthermore, it goes without saying that the winding device used in the present invention is not limited to the structure shown in the above embodiments.

[Effects of the invention] As explained above, the seat belt device according to the invention can sufficiently suppress the resistance force against opening the door at the initial stage of opening the door, and can tightly attach the webbing to the occupant when the door is closed, and can This has the effect of suppressing the slack of the webbing when the door is in the fully open state and the slack of the webbing when the door is changed from the fully open state to the closed state.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an automobile showing an embodiment of the seat belt device according to the present invention, FIG.
4 is a left side view of FIG. 3, FIG. 5 is a sectional view taken along the line of FIG. 1, FIG. 6 is a sectional view taken along the line of FIG. 5, and FIG. The figure is an operation diagram of Fig. 4, Fig. 8 is a cross-sectional plan view showing the door opening degree detection means, Fig. 9 is a cross-sectional view taken along the line shown in Fig. 8, and Fig. 10 is a line showing the change in resistance value with respect to the door stroke. Figure 11 is a circuit diagram showing the control circuit used in the first embodiment, Figure 12 A, B, C, D
13 is a flowchart of the first embodiment, and FIG. 13 is a cross-sectional plan view showing door opening degree detection means used in the second embodiment of the present invention. 10...webbing, 16...door, 20...
Winding device, 30... Crew member, 122... Winding shaft, 1
34... Spring case (rotating member), 140... Clockwork spring (elastic body), 170... Door opening detection means (door opening/closing detection means), 184... Arm,
188...Checker, 192...Detection board, 19
6...Control unit (control means), 300...Door opening detection means, 304...Detection plate.

Claims (1)

[Claims for Utility Model Registration] (1) A webbing for restraining an occupant whose one end is attached to a door and moves as the door is opened and closed; a winding shaft to which the other end of the webbing is attached and which winds up the webbing; an elastic body that has one end connected to the take-up shaft and urges the take-up shaft in the webbing take-up direction; and an elastic body that has the other end attached to the elastic body and increases the webbing take-up force by the elastic body in a take-up force increasing direction. and a rotating member rotatably supported in a winding force decreasing direction to reduce the webbing winding force caused by the elastic body; a door opening/closing detection means for detecting opening/closing of the door; When the closed state is detected, the rotating member is rotated in the direction of increasing the winding force to maximize the winding force by the elastic body;
When the door opening/closing detection means detects that the door in the closed state is opened, the rotating member is rotated in the direction of reducing the winding force, and the winding force is applied by the elastic body until the door is fully opened. control means which rotates the rotating member when the fully open state of the door is detected by the door opening/closing detection means and keeps the winding force by the elastic body at a medium level until the closed state of the door is detected; A seat belt device characterized by having the following. (2) The scope of the utility model registration claim, characterized in that the door opening/closing detection means has an arm that rotates together with the door and is provided with a contact, and a detection plate that is attached to the door and slides with the contact. The seat belt device described in paragraph (1). (3) The utility model registration claim 1 is characterized in that the door opening/closing detection means has an arm that rotates together with the door and is provided with a contact, and a detection plate that is attached to the vehicle body and slides with the contact.
The seat belt device described in paragraph (1).