JPS5963253A - Seat belt taking-up device - Google Patents

Abstract

PURPOSE:To improve protectivity for a man on board, by actuating seat belt take-up driving means based on signals sent from seat belt fastening detection means, seat belt slack detection means and collision predicting detection means. CONSTITUTION:Seat belt fastening detection means 7, seat belt slack detection means 8, a brake circuit 10 and a car speed detection lead switch 11 are connected to the belt take-up driving means that is, a control circuit CONT, which is connected to a motor 53. The brake circuit 1 and the lead switch 11 constitute the collision predicting detection means. A motor 53 is driven by a signal from the fastening detection means 7 so that the belt is taken up to be fitted to the man on board. When a slack happens in the belt, the motor 53 is driven by the signal from the detection means 8 to take the slack of the belt. Further, if brake is applied when the car is running at a prescribed car speed or more, the belt is fastened by the motor 53 that is driven by the signal from a switch 11 of the circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding device for an automobile seat belt.

(1) Conventionally, a spiral spring is used to wind up a seatbelt, which increases the pull-out force of the seatbelt and increases the pressure on the occupant when wearing the seatbelt, causing discomfort. This is a major reason why people are reluctant to wear seatbelts.

The present invention improves the comfort of occupants when wearing a seatbelt by reducing the pull-out force of the seatbelt and the tightening force when wearing the seatbelt.In addition, when there is a high risk of a vehicle collision, the seatbelt is retracted and the seatbelt is tightened. The purpose is to improve the protection performance of the occupant by eliminating slack and tightening the occupant.The seatbelt winding reshaft that winds up the seatbelt and the drive that applies the seatbelt winding force to the seatbelt winding reshaft are designed to improve the protection performance of the occupant by eliminating slack and tightening the occupant. a seatbelt attachment detection means for detecting whether the seatbelt is fastened; a seatbelt slack detection means for detecting whether the seatbelt is slack; and a seatbelt slack detection means for detecting whether the vehicle is at high risk of collision. Collision prediction detection means and control means are provided, and the control means operates the drive means based on signals from the seat belt fastening (2) detection means, the seat belt slack detection means, and the collision prediction detection means. It is designed to take up the slack in the seat belt.

The present invention will be explained below based on examples.

1 to 4 relate to the first embodiment of the present invention, FIG. 1 is a front view of the seat belt retractor of the first embodiment of the present invention, and FIG. 2 is a front view of the seat belt retractor of the first embodiment of the present invention, and FIG. 3 is a detailed view of the slat sensor in the device shown in FIG. 1, and FIG. 4 is a circuit diagram of the control circuit in the device shown in FIG. 1.

In FIG. 1, one beam is fixed to the vehicle body through a hole 11 in the tractor body. Reference numeral 2 denotes a seat belt having one end sewn together into a loop shape, into which a rod 21 is inserted, and is disposed in a recessed portion of a belt S take-up shaft 51 and engaged with the wind-up shaft 51. The other end is fixed to an anchor, pawl, etc. (not shown). A motor 53 is a belt winding drive means, and its shaft 52 engages with the shaft 51, and the main body of the motor (3) 53 is fixed to the tractor main body 1.

A pendulum 42 is movably supported by a plumket 41 fixed to the retractor body 1. When deceleration is applied to the vehicle, such as in the case of a vehicle collision, the pendulum 42 swings, lifts the bowl 6, and the protrusion 61 engages with the gear 54, thereby controlling the rotation of the gear 54. Note that the gear 54 is fixed to the winding shaft 51 and rotates together. The drive voltage for the motor 53 is supplied from the battery 9, and the supply voltage is controlled by a control circuit C0NT serving as a control means.

The configuration of the control circuit C0NT is shown in FIG.

A seatbelt attachment detection circuit comprising a buckle sensor and a resistor 111 constituting the seatbelt I/attachment detection means 7; a seatbelt slack detection circuit comprising a slack sensor and a resistor 114 constituting the seatbelt slack detection means 8; Brake switch 10 installed
Brake circuit 10 consisting of a1 lamp 10b and resistor 1
A brake operation detection (4) output circuit consisting of Zener diodes 13 2a and 12b and a reed switch 11 for vehicle speed detection are provided.

110 is a well-known CR filter including a resistor 112 and a capacitor 113. 120 is a well-known CR filter including a resistor 115 and a capacitor 116. 1
30a, '130b, 130C are one-shot circuits,
Resistor 132, 135, 138, capacitor 1, respectively
33, 136, 139, and a monostable multi-bi break (for example, the well-known Toshiba TC4047BP).

) 131.134.137. Note that 191 is Noah Gate.

150 is an arbitrary set vehicle speed detection circuit, which includes a resistor 152a,
152b, 155.156a, 157a.

157b, 157C1157d, capacitor 153.1
54, 158, and a comparator 159 (for example, the well-known Motorola MC3302 is used). Note that 14 is an AND gate.

160 is a power supply circuit that creates two types of power supply for supplying the seatbelt winding force, one for removing the slack generated in the seatbelt 2 and the other for removing and winding the slack when the seatbelt 2 is attached (5), and resistor 161 .162.1
66, Zener diodes 164 and 165, and transistors 163 and 167. Note that 16 is an inverter and 15 is an AND gate.

Reference numeral 180 is a motor used to remove sludge immediately after the belt 2 is attached, slack caused by the movement of the occupant, sludge when braking at a preset vehicle speed or higher, and when winding the seat belt 2 after the buckle is released. The drive circuit includes resistors 181, 182, 184, 185 and transistors 183, 186. 192a, 192b,
192c and 192d are diodes.

FIG. 3 shows a diagram of the configuration of the slug sensor 8 in the device shown in FIG. 1, viewed from the vehicle body frame (not shown) side. 3
70 is a well-known slip joint used in three-point seat belts, and bolt 3 is attached to the vehicle body frame (not shown), etc.
It is rotatably attached at 80, and the spring 3
At 90 in the figure (6), a weak set load is applied in the anti-chronological direction.

300 is a slack sensor 8 installed at the slip joint
This is the operating part of the Sludge sensor 8 and spring 39
The fixed portion 310 of the fixed end 391 of 0 is fixed to the vehicle body frame (not shown).

The operation of the first embodiment will be explained below.

In FIG. 1, a motor 53 is driven by a battery 9 via a control circuit C0NT. First, when the belt is pulled out from the belt winding device for use in the device, the buckle sensor 7 does not operate, so the control circuit C0NT does not supply power to the motor 53. Therefore, the motor 53 does not operate and idles as the belt 2 is pulled out, so that the belt 2 is pulled out with a low belt tension.

Next, when the tongue plate (not shown) is connected to the buckle (not shown), the output of the puncture sensor 15 changes from "1" to "0", and this changes to the seatbelt 2 attachment detection circuit 1.
10a, the one-shot circuit 130b is activated, the motor drive circuit 180 and the power supply circuit 160 are activated, and the motor 53 is activated at a high voltage (7). Then, the sludge on the lap belt and shoulder belt immediately after the belt 2 is attached is quickly removed.

At this time, the slip joint 370 rotates clockwise in FIG. 3 due to the tension of the belt 2, resulting in the state shown by the dashed line. Therefore, the slack sensor 8 is in the OFF state, and when the passenger normally operates the vehicle at the normal potentiometer, the belt 2 is hardly pulled out due to the resistance of the slip joint 370 or the like.

In this state, when the occupant's body moves significantly, for example, when turning the steering wheel significantly at an intersection or the like, or when reaching for a glove box or the like, the motor 53 runs idle and the occupant's body can move with weak tension. and,
After the occupant's body has been moved, when the occupant's body returns to its original state, no winding force is applied to the belt 2, causing slack, but at the same time, the slip joint 370 is bent as shown in FIG. Similarly, the spring 19 under its own weight.
It rotates counterclockwise (8) in the figure due to the spring force applied, and moves from 370' to 370 as shown by the solid line. Then, the sludge sensor 8 is turned on. The sludge generation signal changes from "1" to "10" by the sludge detection circuit 120a of the control circuit C0NT, and is supplied to one input terminal of the NOR gate 191 through the CR filter 120b. At this time, the buckle attachment signal "0" from the seatbelt 2 attachment detection circuit 110a is input to the Noah gate, and the signal "0" is input to the one-shot circuit 13C.
"1" is input. The one-shot signal is then input to the AND gate 15. Also, and gate 15
The output from the one-shot circuit 130b is input to the inverter 16 through the inverter 16. At this time, Wanshi day soto episode 1? The output of &L30b is "0" since the buckle is already in the attached state, and a signal of "1" is input to the AND gate 15 via the inverter 16.

Therefore, the output of the AND gate 15 becomes "1", and the slack removal power supply circuit 160 operates, driving the motor 53 to promptly remove the slack (9) generated by the movement of the occupant. This voltage for removing the thread is lower than the voltage immediately after attachment. This is because, in general, in the case of a three-point seat belt, the slack caused by the movement of the occupant occurs in the shoulder belt, so the winding force applied to the retractor may be small. Therefore, the feeling of pressure on the occupant when removing slack is also reduced.

Furthermore, when the vehicle occupant steps on the brake (including braking during deceleration) at a speed higher than a predetermined vehicle speed (for example, 40 km/h) due to the danger of a collision, the motor 53 is rotated at a high voltage. Remove sludge from belt 2.

A vehicle speed signal from the vehicle speed detection reed switch 11 is input manually to a set vehicle speed/detection circuit 150 , a voltage corresponding to the vehicle speed signal is charged to a capacitor 154 , and inputted to one end of a comparator 159 . Further, to the other input terminal of the comparator 159, a voltage corresponding to the set vehicle speed set by the resistors 156a and 156b is input. In this state, when the vehicle speed exceeds the set vehicle speed, in other words, the voltage charged to the resistors 156a and 156b
When the voltage becomes higher than the voltage corresponding to the set vehicle speed set by , the output of the comparator 159 changes from rOJ to "1" and is input to the AND gate 14.

The other end of the AND gate 14 is input with the output of a brake circuit currently installed in the vehicle, which includes a brake switch 10a, a lamp 10b, and a brake operation detection circuit, which includes a resistor 12a, 112b, and a Zener diode 13. When you step on the button, a signal from "0" to "1" is input.

Therefore, when the brake is stepped on at a speed higher than an arbitrary set vehicle speed, the output of the AND gate 14 becomes "1", and the motor drive circuit 1
80 and the power supply circuit 160 actuate to operate the motor 53 at a high voltage, tightening the seat belt 2 and removing slack generated by the occupant's clothes, etc., thereby improving the protection performance of the occupant in the event of a vehicle collision. It works to improve. In addition, the seat belt 2 is retracted even when the occupant brakes to avoid danger or decelerates at a speed higher than a preset vehicle speed, but this does not pose a problem to driving and the vehicle stops braking. The winding of the seat belt 2 is released depending on whether the vehicle speed is lower than the set vehicle speed or the vehicle speed is lower than the set vehicle speed.

Next, when the belt 2 is released, the buckle sensor off signal causes the belt 2 attachment detection circuit 110a to be set to "0".
A signal that changes from to "1" is generated, and the CR filter 11
0 to the one-shot circuit 130a. Then, the motor drive circuit 180 and the power supply circuit 160 promptly wind the seat belt onto the seat belt retractor.

In the first embodiment, the vehicle speed signal and the brake switch signal were used as a collision prediction detection means for determining the risk of a vehicle collision. May be combined with signals.

　　　　.

In this case, when the vehicle approaches an obstacle such as a vehicle at a vehicle speed higher than an arbitrary set vehicle speed, the motor operates to tighten the seat belt and remove the seat belt.

Further, as the collision prediction detection means, a G sensor that senses vehicle deceleration caused by braking or the like may be used.

Further, in this embodiment, a single-wound belt winding device is used, but the present invention is not limited to this, and a double-wound belt winding device can be used. Further, although a configuration in which the belt winding shaft and the drive shaft of the motor are directly connected is used, the present invention is not limited to this, and a configuration in which a speed reduction mechanism is used in the middle may be used.

In addition, although the electric power supplied to the motor is cut off at a predetermined time using a one-shot circuit, the present invention is not limited to this, but there is also a configuration in which a Tensilon sensor is installed and the power is cut off when a predetermined tension is reached, or a configuration in which the output of a Surasoku sensor is 0” to “1”
It can be configured to be shut off by a signal that changes to .

As explained in detail above, according to the present invention, the seat belt is easy to put on, and there is less pressure when putting it on.
When determining danger during high-speed driving, the seat belt can be tightened and slack can be removed to improve occupant protection, which is an excellent effect. Further, after the seat belt is released (13), the seat belt is quickly and reliably wound up, so that comfort and safety when wearing the seat belt and convenience in the winding operation can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view of the seatbelt monitoring device of the present invention, FIG. 2 is a side sectional view showing the cross section of the device shown in FIG. 1, and FIG.
The diagrams are a detailed diagram of the slack sensor in the device shown in Figure 1, and Figure 4.
Each figure shows a circuit diagram of a control circuit in the apparatus shown in FIG. 1... Retractor body, 2... Seat belt, 51
. . . Seat belt winding shaft, 53 . . . Motor serving as driving means, 7 . Battery, 10・
...Brake circuit, C0NT...A control circuit that serves as a control means. Representative Patent Attorney Takashi Okabe (14) Figure 2 51 4 Figure 3

Claims (1)

[Claims] Seat belt reshaft to wind the seat belt,
A driving means for applying a seatbelt (S) force to the seatbelt winding reshaft, a seatbelt attachment detection means for detecting whether the seatbelt is attached, and a seatbelt slack detection means for detecting whether the seatbelt is slack. comprising a detection means, a collision prediction detection means for detecting whether there is a great risk of a vehicle collision, and a control means,
Seatbelt winding, characterized in that the control means operates the drive means based on signals from the seatbelt attachment detection means, the seatbelt slack detection means, and the collision prediction detection means to take up the slack in the seatbelt. Tension device.