JPS58185350A - Winding device of seat belt - Google Patents

Abstract

PURPOSE:To eliminate an oppressive feeling of a belt at its wearing further promptly and surely wind the belt, by adjusting the torque applied to the belt in accordance with an electric signal from a belt wearing detecting means and belt sag detecting means. CONSTITUTION:Driving voltage of an electric motor 53 driving a winding shaft 51 is supplied by a storage battery 9, and its supply voltage is controlled by a control circuit CONT. This circuit CONT receives an electric signal from a buckle sensor 7, which is turned on if a tongue plate is connected to a buckle, to supply the driving voltage to the motor 53 and operate the motor 53 then promptly remove a sag from a belt 2. While if a slack is generated in the belt 2 after its wearing, a slack sensor 8 is turned on to generate an output to the control circuit, and said circuit drives the motor 53 to remove the slack. Further at release of the wearing of the belt 2, the sensor 7 is turned off, and the control circuit drives the motor 53 to quickly wind the belt 2.

Description

[Detailed Description of the Invention] The present invention is unique! This invention relates to a 1-set seat belt retractor 9 that is installed in an II vehicle, etc., and particularly relates to drive torque control of a 1-acting seat belt retractor that is installed in an automobile, etc.

In general, a seat belt retractor installed in a vehicle generally uses a mainspring as a driving means, and one end of the mainspring spring is fixed to the main body of the retractor, and
The other end is fixed to the rounded winding 9 portion around which the sorting belt is wound, thereby applying a belt winding force to the winding 98.

In the conventional notebook belt winding device, when manually attaching and detaching the seat belt, the sorting belt is
There is a problem that as the I is extracted, the force required for derivation increases. Friend, when the occupant is tearing the seatbelt, the winding force is applied by the biasing force of the mainspring spring, so the seatbelt VC is always tensioned, and as time passes, There is a problem in that the unpleasant feeling of pressure given to the passengers increases. It is believed that the wearing of sorting belts is one of the reasons why JtVC is disliked.

In addition, the situation in which the slackness of the belt and the tension 3I of the seatbelt change during each movement of the occupant in the conventional seat belt control device is shown in Figure 5.

In view of the above-mentioned problems with the conventional type, an object of the present invention is to make it easy for the seat belt to be worn for a long time, to reduce the feeling of pressure when worn, and to ensure that the seat belt can be retracted quickly and reliably after the seat belt is released. The aim is to increase the convenience and comfort in wearing and winding operations (seat bells).

In the present invention, there is provided a take-up shaft for winding the seat belt, a drive means using an electric motor that engages with the take-up shaft, and a drive means for driving the electric motor in response to signals from the seat belt attachment detection means and the seat belt slack detection means. The seatbelt winding RL system is equipped with a control means for controlling the level tl of the applied voltage, and adjusts the torque applied to the seatbelt in accordance with the electric signals obtained by the sorting belt attachment detection means and the seatbelt slack detection means. Equipment is provided.

A seat belt retractor as an embodiment of the present invention is shown in FIG. FIG. 2 shows a 1-11 cross section of the device shown in FIG. 1, FIG. 3 shows the configuration of the slack sensor in the device shown in FIG. 1, and FIG. 4 shows the configuration of the control circuit in the device shown in FIG. In Figure 1, 1 is IJ) Hole 11 in the tractor body
is fixed to the vehicle body.

2 is a seat belt with one end sewn into a loop shape, a rod 21 is inserted into the loop, and a belt winding shaft 51
The winding shaft 51 is disposed in a recessed portion of the winding shaft 51 and engaged with the winding shaft 51 . The other end is fixed to an anchor, buckle, etc. (not shown). Reference numeral 53 denotes an electric motor which is a belt winding drive means, and its shaft 52 engages with the shaft 51, and the main body of the electric motor 53 is fixed to the tractor main body 1. IJ A pendulum 42 is movable on a gr/gut 41 fixed to the tractor body 1! 1 is supported. When deceleration l is applied to the vehicle in the case of an electronic collision, etc., the S9 element 42 swings, and the bowl 6 metal lifting protrusion 61 engages with the gear 54, completely locking the rotation of the gear 54. Note that the gear 54 is fixed to the snack shaft 51 and rotates together. The drive voltage for the electric motor 53 is supplied from the storage battery 9, and the supply voltage is controlled by the control circuit CONT.

controlled by

The configuration of vIAllIIYonro C0NT is shown in FIG.

A seatbelt attachment detection circuit consisting of a buckle sensor 7 and a resistor 111, and a slack sensor 8 and a resistor 11.
A seat belt slack ejection circuit comprising 4 is provided. A well-known CR filter having a 110-Fi resistor 112 and a capacitor 113; a well-known CR filter having a 120-Fi resistor 115 and a capacitor 116; 130m.

130b and 130a are one-shot circuits, respectively.
Resistor 132, 135, 138, capacitor 133°13
6.139, and a monostable multivibrator (the well-known Toshiba TC40478P is used) 131,
134.137. Note that 191 is Noah Gate.

Power supply regulator with 140μ resistor, capacitor 142, diode 143 and Nant gate 144
This is an Ng circuit. 150 is a motor drive circuit that constantly applies a weak tension to the seat belt 2 in order to prevent the seat belt 2 from stretching due to vehicle vibrations, etc.;
53b, capacitor 157, Zener diode 1
58, and transistor 152.154, 159ftJ
L Bisuru.

160 is 20 rolls of two types of seatbelts, one for removing the slack generated in the seatbelt 2 and the other for winding it up! Resistors 181, 162,
166, Zener diodes 165 and 164, and transistors 163 and 167. Note that 193 is an inverter and 194 is a NOR gate. 170ti circuit 1
This is a circuit for determining whether or not to add a weak tension of 50 to the belt 2, and a Dl flip-flop (for example, the well-known Toshiba fiTc40138P is used).
171.3 Human Powered Or Gate 172 and Or Gate 17
3. 192m, 192b, 192ari
The diode 195 is a Zener diode.

180μ bell) 2'gi & sagging immediately after putting it on, sagging caused by S sea bream, etc., and the seatbelt 2' after the buckle is removed! A motor drive circuit for use in transistor 4, which includes resistors 181, 182, 184, and 185 and transistor 1.
83.186.

A motor back emf detection circuit 200 is provided as shown in FIG. This circuit 200 is a circuit that detects the back electromotive force t- of the electric motor 53 to cut off the weak tension caused by the stretching prevention circuit 150 when the occupant moves the seat belt 2 while wearing the notebook belt. The circuit 200 includes resistors j1 to j5, a comparator (for example, the well-known Motorola MC3302 is used) 207,
Zener diode 205.202, capacitor 201
1 item is provided. An example of the waveform of the voltage supplied to the electric motor 53 is shown in FIG.

FIG. 3 shows a view of the configuration of the sulanokuse/su 8 in the device shown in FIG. 1, viewed from the frame 7 of the vehicle body (not shown) is.

370 is a well-known slot machine used in a three-point seat belt system, and is attached to the vehicle body frame (not shown).
etc.) 3801C, and a weak set load is applied by a spring 390 counterclockwise 'y51g1 in the figure. Reference numeral 300 denotes an operating section of the slack sensor 8 provided in the slide sheet. The slack sensor 8 and the fixed portion 31G of the fixed end 391 of the spring 390 are fixed to the vehicle body frame (not shown).

The operation of the FIG. 1 apparatus is described below. The electric motor 53 is driven by the storage battery g via the control circuit CON'l'. First, when the belt is pulled out from the belt winding lid for attachment, the output of the buckle sensor 7 is O, so the control circuit C0NT does not supply power to the electric motor 53. This is the first time! Since the Jb machine 53 is not operated and the belt 2 is pulled out and emptied, the belt 2 can be pulled out at a low belt tension.

Next, when the tongue plate (not shown) is connected to the buckle (not shown), the output of the buckle sensor 15 changes from "1" to rOJ, which is detected by the seat belt 2 attachment detection circuit 110& of h130a. 1 circuit operates, motor drive circuit 180 and power supply lI! 1 circuit works @ voltage (a in Figure 6 (3)) 4C and motor 5
3 is activated. Fortunately, the slack in the lap belt and shoulder belt when the belt 2 is attached is removed.

At this time, due to the tension of the belt 2, the slide 1 y 370d rotates clockwise in FIG. 3, resulting in the state shown by the dashed-dotted line. Therefore, the slack sensor sFi is turned off.

Thereafter, when the occupant is stationary, the belt 2 is not pulled out significantly, but due to vibrations of the vehicle, small movements of the occupant's body, etc., the electric motor 53 gradually timvs, and the slack sensor 8 detects the slack in the belt 2. There is a possibility that an impossible 81 degree sag may occur. However, control circuit C
For 0NT, the motor drive circuit 15 is
The belt 2 is
After the supply of dry cloth during installation, that is, after removing slack, a weak tensile force is always added (d, d' in Fig. 6 (3)). Therefore, it is possible to suppress the occurrence of small slack in the belt 2 due to vibrations of the vehicle or small movements of the occupant.

In this state, when the occupant's body makes a large movement, for example, when turning the steering wheel sharply at an intersection, or when reaching for a glove box, etc., the weak tension field for preventing sagging is removed. That is, when the occupant's body moves slowly, the electric WA 53 rotates in the opposite direction, and a negative electromotive force is generated. This electromotive force is detected by the electromotive force detection circuit 200, and by cutting off the low tension application to the motor 53, the P motor 53 is made to run idly, and the low tension is used to prevent the passenger from Allow the body to exercise (Figure 6 -).

After the occupant's body has been exercised, the occupant's body returns to its original state (11).
vlAK returns to belt 2, which generates sludge because no winding force is applied to it, but at the same time slip join) 370ij, as shown in Figure 3, the spring force of spring 19 is added to the belt's own weight to create a psychokinetic force. rotates counterclockwise in the figure, from 370' to 37 as shown by the solid line.
Move to 0.

Then, the slack sensor 8 is turned on. Control circuit C
The slack generation signal changes from "1" to "0" by the slack detection circuit 120a of 0NT, and is supplied to one human-powered filter of the NOR gate 1910 through the CR filter 120b. At this time, the Noah gate receives the buckle attachment signal from "1" to "o" from the buckle detection circuit 110m.
The changes to the W/SIT circuit 130e are done manually.
A signal "1" is input to. Then, the one-sent code is input to the NOR gate 194 via the inverter 193 as a signal that changes from "1" to rOJ.

Further, the output from the washer/bottom circuit 130 is manually input to the Noah gate 194, but since the buckle is already in the attached state, the signal rOJ is input. Therefore, the output of the Noah gate 194 becomes "1", the sludge removal power supply circuit 160 operates, and the sludge is removed. The voltage for removing Suranok is shown in Figure 6 (3).
9 ports shown in b < Voltage immediately after installation (1 in Figure 6 (3))
It is smaller than . In addition, in the case of a 3-point notebook belt, the sludge that is generated due to movement generally occurs on the shoulder belt; ! The scraping force may be small. Therefore, the pressure on the occupants is reduced as shown in Figure 6 (2).
), after removing the loss rank smaller than 1 in w
Needless to say, the symbol (/ in Fig. 6 (3)) is added. Next, when the belt 2 is released, the belt 2 tension detection circuit 110 receives the buckle sensor off signal.
A signal that changes from rOJ to “1” is generated at a, and CIl
The signal is input to the shoulder circuit 130b via the filter 110b. Then, using the motor drive [1M180 and the power supply circuit 160, the seat belt is quickly wound up by the seat belt winding and winding device. Thereafter, the low tension/motor drive circuit 150 is also turned off.

In carrying out the present invention, various modifications may be made in addition to the above-described embodiments. For example, in the example described above, -double 4! A two-fold belt winding device is used, but the second belt winding device is not limited to this, and a double-winding belt winding device or device can be used. Further, in the above-mentioned embodiments, a configuration in which the belt winding shaft and the drive shaft of the motor are directly connected is used, but the present invention is not limited to this, and a configuration may be adopted in which the sound of the deceleration mechanism is used in the middle.

Friend, in the above-mentioned embodiment, the electric power supplied to the motor is cut off at a predetermined time using a power/shield circuit, but this is not limited to VC. It can be configured to shut off when the output is off, or shut off when the output of the slack sensor changes from rOJ to "1".

Furthermore, in the above-mentioned embodiment, the height of the voltage supplied to the motor is set in advance in the control circuit (6th level).
A configuration in which control is performed according to @, b, @, and d in Figure (3) was used, but the configuration is not limited to this, and a configuration that automatically changes the level depending on the temperature in summer, winter, etc. can be used. .

Further, it is also possible to set it arbitrarily according to the passenger's preference.

Further, in the above embodiment, the low tension motor drive circuit 150 and the motor back electromotive force detection circuit 200 are used, but it is also possible to have a configuration in which these are not used.

According to the present invention, the seat belt is easy to wear, and
There is less pressure when wearing the seat belt, and after the seat belt is released, the seat belt is quickly and reliably unstretched, thereby increasing convenience and comfort in the seat belt wearing and winding operations.

[Brief explanation of drawings]

Figure 1 shows a seatbelt winding as an embodiment of the present invention *)
Figure 2 is a diagram showing the 1-1 cross section of the Figure 111 device, Figure 3 is a diagram showing the entire configuration of the slack sensor in the Figure 1 device, Figure 4 is the Figure 1 device Figures 5 and 6 are diagrams showing the configuration of the control circuit in Figure 1. Figures 5 and 6 are diagrams showing changes in operation over time. 1... Retractor body, 11... Hole, 2...・Seat belt, 21...rod, 41...bracket, 42
... Loss 9 child, 51 ... Belt winding shaft, 52
... Electric motor shaft, 53 - Electric motor, 54 - Gear, 6 - Bowl, 61 - Protrusion, 7 - Buckle sensor, 8 - Slack sensor, 9 - Storage battery, C
C) Nr...control. 'IJPJ Figure 1 ■ Figure 2 #S5 Figure □ - Waiting time Figure 6 - Time now

Claims (1)

[Claims] 1. A 41115 shaft for winding up the seat belt, a motorized electric motor engaged with the winding shaft, and
The signal I/C from the seatbelt attachment detection means and the seatbelt slack detection means is controlled by the prefecture's 11111 means for controlling the level of the voltage applied to the motor, and the seatbelt attachment detection means and the seatbelt slackness detection means are sent to the prefectural government. A seatbelt retractor and zero device that applies a torque of *m to the seatbelt in response to an electrical signal obtained by a detection request.