JPS58101857A - Seat belt winding-up device - Google Patents

Abstract

PURPOSE:To easily perform fastening of a seat belt and dissipate the pressure applied when the belt is fastened by detecting a slack of the seat belt when fastened by means of a control means and by controlling a winding-up drive means on the basis of the detection signal. CONSTITUTION:A retractor body 1 is fixed to a car body at a hole 1a and a seat belt 2 is fit to a belt winding-up shaft 7 with a rod inserted inside a loop. A shaft 5a of a motor 5 for winding up the belt is engaged to said shaft 7 and the body of the motor 5 is fixed to the retractor body 1. A pendulum 9 is held via a bracket 6 by the retractor body 1, whereby the pendulum 9 is oscillated at a collision of a car to raise a pawl 10 in order to engage a projection 10a with a gear 11 for locking. Only when signals indicating that the diameter of the wound belt is ''small'', a buckle is ''locked'' and the slack is ''present'' are inputted into a computer 12 from respective sensors 14-16, the computer controls the revolution of the motor 5 to achieve the expected purpose.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seatbelt monitoring device for automatically winding up a seatbelt attached to a vehicle to protect occupants, and particularly to a winding drive means and a winding force control device. It is related to the mechanism for

Conventionally, a seatbelt monitoring device that is equipped with a seatbelt in a vehicle and that automatically winds up the seatbelt generally uses a mainspring as a winding drive means, and one end of this mainspring spring is connected to the winding device. Generally, the seat belt is fixed to the main body of the seat belt, and the other end is fixed to a winding section for winding up the seat belt, thereby applying a belt winding force to the winding section.

When manually attaching and detaching the seat belt using the conventional winding device, there is a drawback that the force required for unwinding increases as the seat belt is unrolled.

Therefore, when the occupant unwinds and puts on the seatbelt, a high unwinding force is required, making it troublesome to put on the seatbelt and causing a reluctance to put on the seatbelt. In addition, while the occupant is wearing the seatbelt, the winding force is applied by the biasing force of the mainspring spring, so the seatbelt is subject to a tensile load, which causes strong discomfort to the occupant. It has the disadvantage of giving.

The present invention solves the above-mentioned drawbacks, and provides an easy-to-use and comfortable seat belt that makes it easy to put on the seat belt and does not give a feeling of pressure when putting on the seat belt. The purpose of the present invention is to provide an end-of-life monitoring device, which includes a retractor shaft for retracting a seat belt, a tractor main body for rotatably holding the retractor shaft, and a retractor main body provided between one end of the retractor shaft and the retractor main body. and a control means for controlling the winding drive means, the control means detecting loosening of the seat belt when the seat belt is worn. In addition, the above object is achieved by controlling the drive of the winding drive means based on the loosening detection signal.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. 1. The tractor body is fixed to the vehicle body through hole 1a. Reference numeral 2 denotes a seat belt whose one end is sewn together in a loop shape, and a rod 8 is inserted into the loop, and is disposed in a recessed portion of the belt winding shaft 7 and engaged with the belt winding shaft 7. The other end is fixed to an anchor, buckle, etc. (not shown).

Reference numeral 5 denotes a motor serving as a belt monitoring drive means, and its shaft 5a engages with a shaft 7, and the main body of the motor 5 is fixed to the tractor main body 1. 6 is fixed to the main body 1 with a bracket, and a pendulum 9 is movably supported. When deceleration is applied to the vehicle, such as in the case of a vehicle collision, the pendulum 9 swings, lifts the pawl 10, and the protrusion 10a engages with the gear 11, locking the rotation of the gear 11. Note that the gear 11 is fixed to the winding shaft 7 and rotates together with the winding shaft 7.

The drive current for the motor 5 is supplied from the battery 3, and the supply current is controlled by the combiator 12. The signals from each Haji sensor are input to the combiator 12. 14 is a sensor that determines the size of the belt winding diameter of the belt winding device, 15 is a buckle sensor that determines whether it is in an engaged state or a released state, and 16 is a pelt slack sensor that determines the slackness of the seat belt, that is, pelt slack. This is a sensor that determines the presence or absence of. Further, the computer 12 controls the drive current to the motor 5 according to the signals from each sensor as shown in the table of FIG. 3-1.

Next, the operation of the seat belt monitoring device will be explained in relation to the state of use of the seat belt.

The drive of the motor 5 is controlled by a computer 1-2, which is a control means, as shown in FIG. 3-1. That is, only when a signal indicating that the belt winding diameter is small, the buckle is tied, or the buckle is uncoupled and the slack is present is input to the combiator 12, the drive current for the motor 5 is output from the computer 12, and the motor 5 rotates. The shaft 7 is rotated and the belt 2 is wound up. Therefore, if a slack occurs, it is removed, and if the buckle is released, the belt is wound up on a winding device and stored in the device.

However, in other states, no drive current flows through the motor 5. Therefore, when the belt is being pulled out, the motor 5 idles due to the take-up shaft 7, and the belt is lowered by one tensile when being pulled out. Furthermore, even when the belt is worn, the motor 5 is not driven until a predetermined deflection of the belt occurs, so that the occupant does not feel pressured when the belt is worn.

Also, when the belt deflects more than a predetermined amount, the motor 5 is driven to pull the seat belt in and remove the sludge.
,, the protection performance of the belt does not deteriorate because of this.

FIG. 4 shows the belt tension-belt pull-out stroke characteristics. The solid line is the characteristic of this embodiment, and the broken line is the characteristic of the conventional device. The arrow indicates the direction in which the seat belt moves.

In this embodiment, an example of a single-wrap belt monitoring device is shown, but the present invention can also be applied to a double-wrap belt winding device.

Furthermore, although the belt monitoring shaft and the drive shaft of the motor are directly connected, the present invention is not limited to this, and a deceleration mechanism may be used in the middle.)

Furthermore, although the typical belt-stretched car belt draw-out stroke characteristics in this embodiment are shown in FIG. 4, the present invention is not limited to this, and depending on the control method, there is an effect that the protection performance for the person caught in the car is not deteriorated.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, a cross-sectional view taken along the line B-B in FIG. 2, a cross-sectional view taken along the line A-A in FIG. 1, FIG. Fig. 3-2 shows an operation table of the control means of this embodiment, and Fig. 4 shows a tension-stroke characteristic diagram of the belt monitoring device. 1... Retractor body, 2... Seat belt, 5...
...Motor, 7...Belt end-of-life shaft, 12...
・Computer, 3...Battery. Representative Patent Attorney Takashi Okabe Figure 1 @ Figure 2 1 stroke Figure 3-1 Figure 3-2 Figure 4 Belt 4 stroke

Claims (1)

[Claims] A winding shaft for winding a seat belt, a tractor body for rotatably holding a chain winding shaft, and a seat belt winding shaft provided between one end of the winding shaft and the retractor body, for winding the seat belt onto the winding shaft. It consists of a winding drive means for applying force and a control means for controlling the chain winding drive means, and the control means detects the slackness of the seatbelt when the seatbelt is worn, and based on the slackness detection signal. A seatbelt end-of-life detection device, characterized in that the drive of the end-of-life care drive means is controlled.