JPS5945240A - Seat belt retractor - Google Patents

Abstract

PURPOSE:To completely put a seat belt into a retractor, by using a motor to wind the belt and by controlling the motor to rewind the blet when it is pulled but not put on. CONSTITUTION:A rotation angle detecting ratchet 14 is secured at one end of a winding shaft 12 rotatably supported on a housing 11. A worm wheel 16 is rotatably fitted so that a friction transmitting spring 15 is located between the ratchet 14 and the worm wheel. A motor 18 is secured on the upper part of the housing 11. The torque of the motor 18 is transmitted to a worm 22 through transmission means 19-21. The worm 22 is engaged with the worm wheel 16. A central processing unit 24 controls the motor 18 through a transistor bridge circuit 27 so that the motor is rotated forward or backward. When a belt 1 is pulled out but not put on, it is detected by a displacement detector 23 and the CPU24 controls the motor 18 to drive it to rewind the belt.

Description

[Detailed Description of the Invention] This invention relates to a seat belt retractor! 7-
This invention relates to winding and unwinding of a belt using a motor system.

Conventionally, seatbelt retractors using a motor include those shown in No. 119 and No. 2 Minami (Japanese Patent Publication No. 52-9891).

This seatbelt retractor rotates a buckle engagement switch 2Vc, a motor 3, and a retractor 8 via a worm 4, a fan-shaped gear 5, a lever 6, and 7 ratchet wheels when the seatbelt 1 is pulled out and put on. Rotate the belt in the direction of loosening, and make the total belt constant length Ii/? ! After the lever 6 is pulled out, the lever 6 and the pawl 7 engage to maintain the tension lock state.

However, in such conventional seat belt retractors, the belt mechanism JJ9. r) is the winding k
,,Since it was supposed to be done with the retractable spring in 8,
Frequent belt pulling and winding V causes the winding force of the winding spring to decrease by 11! J (/) Since it is impossible for Komachi to wind all of the pulled out belt into the winder 8, there is a disadvantage that a part of the belt is pulled 1t4σt1-tajima.

There is no seatbelt retractor that does not use such an inconvenient retracting spring, and instead uses a motor to retract it and even pull it out! One person has already proposed J =, and according to this, there will be no inconvenience caused by the reduction in VC of the 9 windings of the above-mentioned volume Q12.
7597).

However, even with this seat belt retractor that has a durable motor, when winding the belt due to the motor, the rotation of the winding shaft stops for a certain period of time (1 to 2 seconds).
When the winding is completed, the device that controls the winding determines that the winding is complete and stops the winding process, causing the seat belt to get caught on the occupant's arm or headrest, causing the belt to wind up. If the belt stops in the middle of being wound, the belt will not be wound any further, and the belt will be taken out and the edge will be wound into the tractor.
.

This remaining belt portion becomes an obstacle to getting on and off the vehicle, and is not aesthetically pleasing, which is a problem that needs to be solved.

The present invention was made by focusing on both the disadvantages of the seat belt retractor that uses a winding spring and the problems that need to be solved with the seat belt retractor that uses a motor. By providing a means to rewind the K-belt when the buckle switch is OFF (when the belt is not attached) and the tank is not engaged with the buckle, ii. ? It is for a purpose.

The details of the present invention will be explained below based on the VC shown in FIG.

In Figures 3 and 4 VC, 11 is a housing formed into a substantially U-shape, and 12 is the top plate a of the housing.

It is a winding shaft that is rotatably supported by the belt 11b and to which the end of the belt 1 is fixed.

One end VC of this winding shaft 12 is
2. Rotation in the drawer direction k I! A known emergency locking mechanism 13 is provided for stopping the vehicle.

Further, a rotation angle detection mold wheel 1 is provided at the other end protrusion of the winding shaft 12.
4 is fixed, and furthermore, a worm wheel 1 (3) is loosely fitted with a freely rotatable VC while holding a tqτ friction transmission spring 15. The end Vr- of the winding shaft 12 is connected to a snap 7'37f1.
7 is engaged, and the worm wheel 16 is only prevented from being removed.

18tj: A motor fixed to the upper part of the housing 11. The rotation shaft 188 of the motor 18 protrudes rearward from the side plate 11a, and the worm 19 is fixed thereto. This worm 19 is fixed to a shaft 20 which is rotatably supported on the side plate 11a so as to be directly fired with the worm 19, and is connected to a worm wheel 21 by IY/.

Furthermore, a worm 22 that meshes with a worm wheel 16 that is loosely fitted onto the winding shaft 12 is fixed to the end of the shaft 20.

Therefore, when the motor 18 is rotated, the rotation is caused by the worm 1.9. Worm wheel 2 ], , Worm 2
The deceleration signal is transmitted to the Tetsuta wheel 16 via two wheels. The worm wheel IO turns kfl- is transmitted to the winding shaft 12vc via the mold wheel 14 due to the frictional force with the imperial transmission spring 16.

23 is a displacement detection device using two 7-otocouplers,
Side plate of housing 11], 1. aK has arrived at the same time.

Next, FIG. 5 shows an embodiment using a microcomputer such as a belt control device.

In the figure, 24 is a CPU of a microcomputer, which has an output port and an input port, and a ROM'25.k that stores all programs and constant data. And input signals, calculation results, etc.?
27 is a transistor bridge circuit for controlling the forward and reverse rotation of the motor 18, and by reversing the motor 18, the V-belt's % @ J [iV 5 times] is stored temporarily. , and is controlled so as to give an appropriate slack to the belt by rotating the belt in the forward direction. 28 is an input for inputting a signal from the vehicle speed pulse generator 61 to add a value for giving an appropriate slack to the belt. Capo), 50 is when the fastening point is attached to the tank buckle sewn to the belt drawer end #L (seat belt wearing state)
29 is an input capo that inputs this signal), 3],
, 82U! J) This is an input port for inputting signals from the displacement detection device 23 for detecting the rotation angle sound of the winding shaft 12 of the tractor.

As shown in the detailed diagram of FIG. 6, the displacement detection device 23 receives pulse signals SI + S from two photocouplers.
t k microcomputer l°7! It counts, detects the rotation direction and rotation angle sound of the retractor, and detects the relative position sound of the seatbelt. Mouth [weight-bearing]

Next, a belt control device is used to rewind the belt.
The operation of the built-in microcomputer 7? Further explanation will be given according to the flowchart shown in FIG.

That is, when the tank or the buckle is completely removed and the buckle switch, which is the attachment detection device, changes from the ON state to the OFF state, ■[Buckle 5WON → OFF This routine starts from J, and the buckle signal 7) iO of the boat 29 is released.
When the T/c changes from the N-like column to the OFF state, the CPU 24 of the microcomputer outputs a signal 7 from the output port to the transistor bridge circuit 27 to wind it up.
■“Start winding the belt” is performed. This winding v'L
- Therefore, the rotation angle detection model wheel 14 rotates, and from this, the displacement detection device 23 detects the rotation angle of the winding shaft 12, and determines whether the winding is completed or not. In other words, the determination as to whether or not the winding is complete is determined by the fact that the winding pulse accompanying the rotation of the ratchet wheel for detecting the rotation angle of the vcs takes a short time (2 seconds in this embodiment, as shown in "Timed Interruption" to be described later). Will it come out or not? It is detected, and if it comes out, it is during winding v, and it becomes NO, and it is determined again, and if there is no flow, winding is "completed", and Y88
Then, proceed to ``Drawer?''. In the next ■ "Drawer?", if the above 6 'Completion'% is ``Complete'' with some remaining part caused by the belt getting caught on an arm etc. during winding, then the 1,000Q is By pulling out the belt again, the question ``Draw out?'' becomes yes, and ``Belt winding V starts [) 449s'' The belt is re-winded. Therefore, (2) "belt winding start" means both the initial belt winding and the re-winding. Rough sieve: If "Is the winding complete?" is Yes, is this Yes the true VC winding remaining? In the case of ``Complete'' with no pregnancy left, of course no withdrawal will be made, so ■ ``Withdraw'' will be NO. s < 2r
The belt will not be re-winded by proceeding to ``Start Belt Winding''.

This is the basic routine that makes up all the essential parts of the present invention.

Next [According to the scheduled interrupt shown in Figure 8, the previous H video "Is the winding complete?" ” will be explained in detail.

This flowchart shows the rotation of the retractor winding shaft (
Detected when the retractor is rotating?
Complete? If the take-up shaft is rotating, it will be Yes and proceed to "Timer clear T2 ← 0".
Clear the timer (T,) to determine if it has stopped for more than 2 seconds, and proceed with ■l'-NEXTjK. -The rotation of the take-up shaft has stopped and 1■ [Is the retractor rotating? ” is N
If it is o, proceed to ■ "T2) 2 seconds" and continue for more than 2 seconds ■ Proceed to "Wind up! llF clear", and if it is within 2 seconds, proceed to the processing meeting of the above ■ "Wind υF clear"■[NEX'
Proceed to l'J.

On the other hand, if ■ "Is the retractor rotating?" is No and the winding is stopped, the timer determines that the time t
Check, that time or more than 2 profit.

If T, > 20,
If you advance to Ic, and before that proceed to ■ "NEXT" and proceed to ■ "Clear Winding F", i17. teeth,? ■ Clear all the %Q capture flags used in the motor drive process shown in Figure 9 and take up the winding! 1 is completed.

FIG. 9 shows a process in which all motor control is performed based on the routine for all rotation detection shown in FIG. 8. Check the winding determination flag stored in the RAM 25, and if the flag is set, proceed to ■ "Motor winding 9-way movement", and when the flag is cleared, the winding 1r is set. The motor is output from the output boat so as to control the motor continuously, and the motor continues to rotate in the winding direction, continuing the winding process. 0 "Winding v F? 'If J is clear, that is, if winding V is completed, O
rNormal control", the winding 9, etc., which is applied to the belt drawer, and the target position control by comparing the current position of the belt with the target position, etc., are performed. I'm going back.

], 0 shows the winding determination process in the main routine. That is, at 01 buckle sw'i' J, the buckle switch is turned on by the signal from the boat 29.
, OFF'i is determined, and ON state (belt attachment status f:, q
), proceed to ○ "Other processing" and perform all the tightening, loosening, etc. after wearing the belt. On the other hand, in the OFF state (belt not attached state), [phase] [ON-+OFF j
Compare with the signal of the cross switch (before vc-cU), and
When the state changes from N to OFF, that is, when the tongue is injured from the buckle, the process proceeds to (2) ``Set winding 9F'', sets the winding flag t, and performs winding 9 control using the motor drive routine shown in FIG. On the other hand, if the belt is pulled to the arm during winding, and it is OFF from the front f, 1Q, proceed to ■ ``Belt drawer'' and enter the [stock], -, (belt position). (Compared with last time) It is determined whether the belt has been fully pulled out or not, and if the belt has been fully pulled out, proceed to o "Wind-up F set".

Therefore, the 0 "winding υF upper set it, FiIK
When z y y comes out of the buckle, 2■ If the belt is pulled out in 2, the winding flag is set to 5, and the winding is started using the motor engraving routine shown in Figure @9. The material is taken up and re-wound. Enthusiasm [phase]
If "Belt drawer" is "None", the above o "Other processing" is performed without setting the winding jig flag.
All other processes in the main routine are executed at 0 [Buckle SW? I will return to J.

Above processing 2 judgment? This is done repeatedly within the microcomputer.

As explained above, the present invention includes a winding shaft with a fixed end portion of the seat belt, a motor that rotates the winding shaft in the belt winding direction, and a direction in which the seat belt is pulled out. a displacement detection device that detects the entire displacement of the seatbelt in the retracting direction and rotation angle in the pull-out direction when a signal is activated; a mounting detection device that detects the sound of the seatbelt being worn; and a mounting detection device and the displacement detection device. A bell that moves the motor based on the output) and a ttt control device that activates the belt when the seat belt is not worn. Since the drawer is equipped with a means to make the belt resistant to rewinding, the crew member can use the belt and I! :When removing the ILJ, press the seat bell after removing the tank from the buckle)
With SJHR, even if the seatbelt gets caught on an arm or headrest, winding ends mid-way, and the seatbelt remains outside the retractor, it can be re-wound with a simple operation. Therefore, it is possible to completely store the entire belt inside the retractor without leaving any part of the belt outside the retractor, and it is possible to completely store the entire belt inside the retractor without leaving any part of the belt outside the retractor. Both issues are to be determined.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing an example of a conventional seatbelt retractor, Fig. 2 is a schematic configuration diagram thereof, and Fig. 3 is a front view showing an example of the bottom of a seatbelt retractor according to the present invention. , FIG. 4 is a top view of the same, FIG. 5 is a schematic configuration diagram of an embodiment using a microcomputer of the present invention, and FIG.
The figure is a detailed configuration diagram of the displacement detection device, Figure 7 is a flowchart showing an overview of the present invention, and Figure 8 (a) is when winding is complete? FIG. 8(b) is a flowchart showing a part of FIG. 8(a) in detail, FIG. 9 is a flowchart for fully controlling the motor, and FIG. 1O is a flowchart showing the winding determination process. 1...Seat belt, 11...Housing, 12.
... Winding shaft, 14... Rotation angle detection claw group, 1δ...
Motor, 23...Displacement detection device, 24...Microcomputer, 25...ROM, 26...RAM,
27...Transistor bridge. Figure 3 1 (Towards the Invention) Figure 10 Commissioner of the Japan Patent Office 1, Indication of the case 1988 patent (□11 [No. 154829 2° Name of the invention Seatbelt retractor 3, Person making the amendment Case and Relationship: Applicant (899) Nissan Motor Co., Ltd. 4, Agent No. 5, Suiseikai Building (2), 1-29 Akashi-cho, Chuo-ku, Tokyo 104
Correct the figure as shown in the attached sheet.

Claims (1)

[Claims] (1) A take-up shaft to which the seat belt end is fixed, and the entire belt winding direction of this take-up shaft. A motor that rotates the motor in the pull-out direction, a signal activated according to the rotation # of the take-up shaft, a displacement of the seat belt in the take-up direction and a displacement in the pull-out direction. a belt control device that fully drives a motor based on the outputs of the seat belt detection device and the displacement detection device; and a belt rewinding device that extracts belt sound when the seat belt is not worn. A seatbelt retractor characterized by having a means for performing retracting.