JPH0597013A - Electrically driven elr seat belt device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an electric ELR seat belt device in which the webbing can be pulled out at all times and unnecessary power consumption is suppressed. The winding shaft 14 around which the webbing 16 is wound is prevented from rotating in the webbing pull-out direction by engaging the ratchet teeth 46 of the lock wheel 42 and the pawl 70. A solenoid 74 is connected to the pawl. The solenoid is supplied with power from a battery 99 by an ignition switch 94 or a buckle switch 92 via a limit switch 88 and an acceleration sensor 90, and in a state where power is supplied, the pawl is separated from the ratchet teeth. The limit switch closes the contact by pulling out the webbing 16 from the winding shaft by a predetermined amount or more, and the buckle switch closes the contact when the seat belt is attached and closes the contact when the seat belt is not attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt device for protecting an occupant in a vehicle emergency, and more particularly to an electric ELR seat belt device having an electric ELR mechanism.

[0002]

2. Description of the Related Art In a seat belt device for protecting an occupant provided in a vehicle, webbings are wound in layers and housed on a winding shaft of a webbing winding device. In this webbing take-up device, the take-up shaft can rotate in the webbing pull-out direction and in the webbing take-up direction. When the vehicle is in emergency (during rapid deceleration), this is detected by an acceleration sensor and the webbing is taken up instantly. There is a so-called ELR (emergency locking retractor) that prevents rotation of the take-up shaft in the webbing pull-out direction. In this way, the occupant's body is prevented from moving due to inertial force during a vehicle emergency, and the occupant is protected.

In this ELR, a solenoid is driven by an electric signal from an acceleration sensor that operates at a predetermined acceleration, and a ratchet tooth of a lock wheel connected to a take-up shaft of a webbing take-up device is provided with a pawl of a lock lever. There is an electric type that meshes with each other to prevent rotation of the lock wheel and prevent rotation of the winding shaft in the webbing pull-out direction.

In this electric ELR seat belt device, a structure for preventing the webbing from being pulled out when the power supply to the solenoid is cut off in order to further ensure the operation is disclosed in JP-A-49-116733. Proposed.

FIG. 4 is a schematic block diagram of the electric ELR seat belt device 100. Solenoid 1
02 is a ratchet tooth of the lock wheel when the limit switch 106, the ignition switch 108, and the acceleration sensor 110 connected between the solenoid 102 and the battery 104 are activated to cut off the power supply from the vehicle battery 104. It engages with the pawl to prevent the winding shaft from rotating in the webbing pull-out direction.

The limit switch 106 closes its contacts when the webbing is pulled out from the winding shaft by a predetermined amount. Further, the ignition switch 108 is closed at its contact when it is turned on by operating the ignition switch key. This allows the solenoid 102
Power is supplied to. Further, the acceleration sensor 110 detects the acceleration and opens the contact when the vehicle reaches the emergency state from the normal running state, and the power supplied to the solenoid 102 is cut off.

This electric ELR seat belt device 100
In a state in which substantially the entire amount of the webbing is wound around the winding shaft, the ratchet teeth and the pawl are mechanically separated from each other, and the limit switch 106 is pulled out by a predetermined amount for the occupant to wear the seat belt. Closes the contacts and drives the solenoid 102. Further, by pulling out the webbing, the pawl can be engaged with the ratchet teeth, but the pawl is held in a separated state by driving the solenoid 102.

On the other hand, when the vehicle is in an emergency, the acceleration sensor 110 is activated to cut off the power supply to the solenoid 102. As a result, the pawl meshes with the ratchet teeth, and rotation of the winding shaft in the webbing pull-out direction is prevented.

However, in such an electric ELR seat belt device 100, the webbing cannot be pulled out by a predetermined amount or more unless the ignition switch 108 is turned on, which causes a trouble in wearing the seat belt. Regardless of whether it is on or off, the solenoid 1
02 is driven. Further, when the webbing is not pulled out, the solenoid 102 is not supplied with power to prevent the battery of the vehicle from rising.

By the way, there are some child seats that are mounted on a vehicle by a seat belt device. In this child seat, the tongue plate and the buckle are engaged with each other, and the child seat is held by the tension applied to the webbing by the urging force of the winding shaft in the webbing winding direction.

[0011]

However, in the seat belt device having the above structure, the ignition switch 1 is used.
Even when 06 is turned off, when the child seat is attached, power is supplied to the solenoid 102, which causes a problem that the battery of the vehicle goes up.

The present invention has been made in consideration of the above facts, and the webbing can be pulled out even when the ignition switch is in the off state, and the webbing can be pulled out when the ignition switch is in the off state to open the child seat. An object of the present invention is to provide an electric ELR seat belt device that does not become energized when worn.

[0013]

SUMMARY OF THE INVENTION An electric ELR seat belt device of the present invention for solving the above problems is a winding shaft in which a predetermined amount or more of webbing is pulled out from a winding shaft for winding webbing in layers. Lock means for preventing the rotation of the webbing in the pull-out direction, and the lock means is operated in a state in which the power can be supplied when the webbing is pulled out from the winding shaft by a predetermined amount or more and the power is cut off. The lock actuating means, the acceleration detection shutoff means for shutting off the power supply to the lock actuating means by detecting the emergency state of the vehicle, and the tongue plate and the buckle for mounting the webbing in the disengaged state. Supplying power to the lock operating means and supplying power to the lock operating means in the engaged state and the ignition switch in the off state And mounting detection blocking means for blocking, characterized by having a.

[0014]

In the electric ELR seat belt device of the present invention having the above-mentioned structure, the locking means can be operated by pulling out the webbing from the winding shaft by a predetermined amount when the ignition switch is turned on. When the acceleration detection cutoff unit detects an emergency state of the vehicle (for example, a sudden deceleration state), the power supply to the lock actuation unit is shut off to activate the lock unit. As a result, rotation of the winding shaft in the webbing pull-out direction is blocked, and the occupant is protected.

Further, even if the webbing is pulled out by a predetermined amount while the ignition switch is in the off state, if the seat belt is not yet worn, power is supplied to the lock operating means, but if the seat belt is worn, That is, when the tongue plate and the buckle are engaged, the power supply to the lock actuating means is cut off.

Therefore, in the electric ELR seat belt device of the present invention, when the ignition switch is in the on state, the webbing can be pulled out from the winding shaft and the webbing can be wound around the winding shaft freely. When the vehicle is in an emergency, the locking means prevents the winding shaft from rotating in the webbing pull-out direction. Further, even when the ignition switch is in the OFF state, the webbing take-up shaft is not prevented from being rotated by the locking means, and the webbing can be pulled out and taken up freely.

Further, when the webbing is wound around the winding shaft, no power is supplied to the lock operating means.
If the ignition switch is off,
The power supply to the lock actuating means is shut off by the operation of the attachment detecting and shutting off means.

Therefore, when the ignition switch is in the OFF state, power is not supplied to the lock actuating means in both the state in which the webbing is wound around the take-up shaft and the state in which the seat belt is attached, and unnecessary power consumption is suppressed. It is possible to prevent the battery of the vehicle from rising.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, a seat belt device 1
In the first embodiment, a occupant restraining webbing (hereinafter referred to as "webbing") 16 is pulled out from the webbing retractor 10 by a predetermined amount, and a tongue plate 96 having an intermediate portion of the webbing 16 inserted and a buckle 98 fixed to the vehicle body are provided. It is designed to engage. Further, the buckle 98 is provided with a buckle switch 92 whose contacts are opened by inserting the tongue plate 96. In this seat belt device 11, the tip of the webbing 16 is locked to the anchor plate 11A fixed to the lower part of the vehicle body, and the portion of the webbing 16 between the tongue plate 96 and the webbing retractor 10 is located above the vehicle body. It is inserted through the fixed shoulder anchor 11B.

FIG. 2 shows an exploded perspective view of the webbing retractor 10. In this webbing retractor 10, the frame 12 is fixed to the vehicle body by mounting bolts (not shown). The frame 12 has a pair of leg plates 12A extending parallel to each other on both sides.

The take-up shaft 14 is rotatably supported on the leg plates 12A, and the tongue plate 96 of the webbing 16 is opposed to the through-hole 14A radially extending to the center of the take-up shaft 14. The end on the side is locked. Further, the mainspring 18 is attached to one end of the winding shaft 14.
Is locked at one end thereof, and the winding shaft 14 is always biased in the webbing winding direction.

A projecting portion 20 into which an adapter 22 is fitted is formed at the end of the winding shaft 14 opposite to the mainspring 18. Further, a protrusion 24 is formed on the adapter 22, and a pinion gear 26 is provided at the tip. A pair of recesses 28 are formed in the protrusion 24. Further, a through hole 30 is formed near the base of the projecting portion 24. When the adapter 22 is fitted on the tip of the winding shaft 14, the projecting portion 20 penetrates through the through hole 30, and then the adapter 22.
It is configured so as to be projected from.

A pair of lock plates 32 are arranged around the protrusion 24. These lock plates 3
2 has a substantially C-shape in which a substantially U-shaped notch 34 is formed in the central portion, and the notches 34 are arranged to face each other. The winding shaft 1 is inserted into these notches 34.
4, the lock plate 32 rotates together with the winding shaft 14. Further, the width dimension of the notch 34 is formed to be slightly larger than the width dimension of the protruding portion 20, and the lock plate 32 is rotatable relative to the winding shaft 14 by a predetermined angle.

A claw portion 36 is formed at one end of each of the lock plates 32, and corresponds to a lock tooth 38A of an internal tooth ratchet wheel 38 fixed to the leg plate 12A. In the state where the claw portion 36 and the lock tooth 38A are meshed with each other, the rotation of the lock plate 32 is blocked by the inner tooth ratchet wheel 38, whereby the winding shaft 14 is rotated.
The rotation of the webbing in the pull-out direction is blocked.

A pair of pins 40 project from the lock plate 32, respectively, and are inserted into an elongated hole 44 formed in a lock ring 42. Ratchet teeth 46 are formed on the outer circumference of the lock wheel 42, and the lock wheel 42 is rotatable relative to the protrusion 24 of the adapter 22. A rotation wheel 48 that engages with the protrusion 24 and rotates integrally with the lock wheel 42 is disposed outside the lock wheel 42.

A locking claw 50 is formed in the center of the rotary wheel 48, and is fitted and locked in a recess 28 formed in the projecting portion 24 of the adapter 22. This rotary wheel 48 and the lock wheel 42 between the torsion coil spring 5
4 is interposed.

The torsion coil spring 54 is supported by a support protrusion 56 formed on the lock ring 42, one end of which is in contact with a spring locking pin 58 of the lock ring 42, and the other end of which is formed on the rotary wheel 48. It is in contact with the locking pin 60. The lock ring 42 is constantly urged in the webbing pull-out rotation direction of the winding shaft 14 by receiving the urging force of the torsion coil spring 54.

Therefore, normally, the pin 40 of the lock plate 32 is located at one end of the elongated hole 44, and the claw portion 36 of the lock plate 32 is separated from the lock teeth 38A. However, when relative rotation occurs between the lock ring 42 and the winding shaft 14 that rotates in the webbing pull-out direction, a rotation delay occurs against the biasing force of the torsion coil spring 54, and at the time of this rotation delay, the lock plate 32 moves. Guide the pin 40 to the other end of the long hole 44, and lock the pawl portion 36 with the lock teeth 38A.
It is designed to fit in.

An ELR lever 64 is arranged near the outer periphery of the lock wheel 42. As shown in FIGS. 2 and 3A, the ELR lever 64 includes arms 66 and 68 and is swingably supported by the leg plate 12A. Arm 66
A pawl 70 is formed at the tip end of the lock wheel 42 so as to face the ratchet teeth 46 of the lock wheel 42. By engaging with the ratchet teeth 46 of the lock wheel 42, the rotation of the lock wheel 42 in the webbing pull-out direction is stopped. Is becoming A tension coil spring 72 is arranged at the opposite end of the pawl 70 to bias the pawl 70 toward the ratchet teeth 46. A solenoid 74 is connected to the arm 66 near the pawl 70. Solenoid 7
4 is adapted to house the drive shaft 74A in the main body when power is supplied, and to separate the pawl 70 from the ratchet teeth 46 against the biasing force of the tension coil spring 72. Further, when power is not supplied to the solenoid 74, the drive shaft 74A is pulled out from the inside of the main body by the urging force of the tension coil spring 72.

Further, the ELR lever 64 can separate the pawl 70 from the ratchet teeth 46 even when the arm portion 66 is pushed against the biasing force of the tension coil spring 72.

The arm 68 of the ELR lever 64 is a cam 7
6 is supported. The cam 76 is a substantially circular plate of a thick plate, and is a projection portion 8 that is projected from the peripheral edge to one side in the radial direction.
0 forms a cam shape. The cam 76 is rotatably supported by the protruding portion 24 of the adapter 22, and the arm portion 76 can come into contact with the outer peripheral surface 78.

As shown in FIG. 2, an internal gear 82 is formed on the cam 76 coaxially with the pinion gear 26. The internal gear 82 includes a gear 84 rotatably supported by a cover 86. It engages with the pinion gear 26 via the pinion gear 26, whereby the rotation of the winding shaft 14 is decelerated and transmitted to the cam 76. Cam 76
Is rotated about once during the time when the winding shaft 14 is rotated and the webbing 16 is completely wound up and pulled out. The total amount of the webbing 16 means the anchor plate 11A shown in FIG. 1 when the tongue plate 96 and the buckle 98 are disengaged.
And shoulder anchor 11B and webbing retractor 1
The remaining amount of the webbing 16 stretched between 0 is set.

As shown in FIGS. 2 and 3 (A), a limit switch 88 is provided near the outer periphery of the cam 76, and the swinging portion 88 of the limit switch 88 is provided.
A contacts the outer peripheral surface 78 of the cam 76. In the limit switch 88, the swinging portion 88A has the protruding portion 8
The internal contact points are switched between a state in which the outer peripheral surface 78 of 0 is in contact with another outer peripheral surface 78.

As shown in FIG. 3B, the solenoid 74 has a vehicle battery 99 via a limit switch 88, an acceleration sensor 90 and a buckle switch 92.
It is connected to the. Further, an ignition switch 94 is arranged in parallel with the buckle switch 92. The ignition switch 94 is interlocked with an ignition key (not shown), and its contact is closed by turning on the ignition key. The acceleration sensor 90 is adapted to detect a sudden deceleration in case of an emergency of the vehicle, and to open the contact point when the rapid deceleration is detected.

As a result, the webbing 16 makes the winding shaft 1
Winding shaft 14 when pulling out from the state in which the entire amount is wound on 4
The cam 76 rotates in accordance with the rotation of the protrusion 80, and the swinging portion 88A of the limit switch 88 and the arm portion 68 of the ELR lever 64, which are in contact with the outer peripheral surface of the protrusion 80, are separated from the outer peripheral surface 78 of the protrusion 80 in order. .. As a result, the limit switch 8
Reference numeral 8 closes the contacts and power is supplied to the solenoid 74. The solenoid 74 operates so as to separate the pawl 70 from the ratchet teeth 46, and the arm portion 68 is floated from the outer peripheral surface 78.

Next, the operation of this embodiment will be described in detail with reference to FIG. When the occupant does not wear the seat belt and the webbing 16 is completely wound around the winding shaft 14, the swinging portion 88A of the limit switch 88 and the ELR lever are attached to the outer peripheral surface 78 of the protrusion 80 of the cam 76. 64
The arm 68 is in contact, the ELR lever 64 is pushed, and the pawl 70 is separated from the ratchet teeth 46 of the lock wheel 42.

The acceleration sensor 90 and the buckle switch 92 have their contacts closed, but the limit switch 88 has its contacts open so that the solenoid 74 is not supplied with power. That is, regardless of whether the ignition switch 94 is on or off, when the webbing 16 is not pulled out, power is not supplied to the solenoid 74, and even if this state is maintained, the battery 99 of the vehicle does not rise. ..

The winding shaft 14 is rotated by pulling out the webbing 16 for the occupant to wear the seat belt. The cam 76 rotates with the rotation of the winding shaft 14, and the swinging portion 88A of the limit switch 88 causes the protruding portion 8 to move.
0 away from the outer peripheral surface 78. As a result, the limit switch 88 closes the contacts, so that power is supplied to the solenoid 74. By supplying power to the solenoid 74, the solenoid 74 holds the pawl 70 of the ELR lever 64 in a state of being separated from the ratchet teeth 46 of the lock wheel 42.

On the other hand, when the cam 76 rotates as the winding shaft 14 rotates in the webbing pull-out direction, the ELR lever 64
The arm portion 68 is also separated from the outer peripheral surface 78 of the protrusion 80 so that the pawl 70 can be engaged with the ratchet teeth 46. However, since the pawl 70 is separated from the ratchet teeth 46 by the solenoid 74, the rotation of the winding shaft 14 in the webbing pull-out direction is not blocked. As a result, the ignition switch 94
The webbing 16 can be pulled out and accommodated regardless of whether it is turned on or off.

When the ignition switch 94 is turned on to start the engine, the webbing 16 is pulled out,
The tongue plate 96 and the buckle 98 are engaged with each other to mount the seat belt. In this case, the buckle switch 92
Is designed to open the contact, but the solenoid 74
Since power is supplied from the battery 99, the extra webbing 16 is forced by the urging force of the winding shaft 14.
Further, the occupant is held by a constant tension acting on the winding shaft 14 by the urging force of the tension coil spring 72 acting on the winding shaft 14.

Further, in this state, since the pawl 70 is separated from the ratchet teeth 46 of the lock wheel 42, the webbing 16 can be pulled out and stored in the webbing retractor 10, and the occupant can seatbelt. It is possible to take any riding posture even when it is worn.

In the case of an emergency of the vehicle, the acceleration sensor 9
0 opens the contact, and the power supply to the solenoid 74 is cut off. When the power supply to the solenoid 74 is cut off, the pawl 70 is urged toward the ratchet teeth 46 of the lock ring 42 by the urging force of the tension coil spring 72 and meshes with the ratchet teeth 46, so that the webbing pull-out direction of the lock ring 42 is increased. Prevent rotation to.

On the other hand, since the occupant's body tries to move in the anti-acceleration direction due to the inertial force, the webbing 16 moves the winding shaft 1
4, the take-up shaft 14 rotates in the webbing pull-out direction. For this reason, the locking wheel 42 that has rotated together with the winding shaft 14 is prevented from rotating by the ELR lever 64, and relative rotation occurs with respect to the winding shaft 14.

Due to this relative rotation, the pin 40 of the lock plate 32 rotating with the winding shaft 14 is locked by the lock ring 42.
The guide shaft 36 is moved by being guided by the long hole 44, and the claw portion 36 meshes with the lock tooth 38A of the internal tooth ratchet wheel 38 and the take-up shaft 1
The rotation of the webbing 4 in the pull-out direction is prevented. As a result, the occupant is securely restrained by the webbing 16.

Further, in the seat belt device 11, the tongue plate 96 and the buckle 98 are engaged with each other (that is, the contact of the buckle switch 92 is open).
When the ignition switch 94 is turned off, the power supply to the solenoid 74 is cut off.

For example, when the child seat is mounted and the ignition switch is turned off, the webbing 16 is prevented from being pulled out from the webbing retractor 10. Therefore, the child seat is held on the seat by the ebbing 16. In this state, the solenoid 74
Since the power supply from the battery 99 is cut off, the power of the battery 99 is not unnecessarily consumed.

The tongue plate 96 and the buckle 98 are also provided.
Even if the ignition switch 94 is turned off in a state where the buckle switch 92 is engaged, the buckle switch 92 is released by disengaging the tongue plate 96 from the buckle 98.
Closes the contacts, so that the solenoid 74 is supplied with power. As a result, the solenoid 74 is driven to release the meshing between the pawl 70 and the ratchet teeth 46, and the webbing 16 can be pulled out and wound up.

As described above, in this embodiment, the solenoid 74 when the ignition switch 94 is off is used.
It is possible to prevent unnecessary power consumption of the vehicle and prevent the battery of the vehicle from rising. Even if the ignition switch 94 is off, the webbing 1
6 can be pulled out and wound up freely.

In this embodiment, the winding shaft 14 is biased in the webbing winding direction by the torsion coil spring 54. However, the rotation of the winding shaft 14 in the webbing winding direction is driven by a driving means such as a motor. It may be performed by.

[0051]

As described above, the electric EL of the present invention is used.
In the R seat belt device, even when the ignition switch is off, the webbing can be pulled out and wound up freely, and the webbing is accommodated, or the ignition switch is off and the tongue plate and the buckle are engaged. Since the power supply is cut off in both cases, it is possible to obtain an excellent effect that unnecessary power consumption can be prevented and the battery of the vehicle can be prevented from rising.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an electric ELR seat belt device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a webbing retractor of an electric ELR seat belt device according to an exemplary embodiment of the present invention.

FIG. 3A is an electric EL according to an embodiment of the present invention.
It is a schematic block diagram which shows the operating state of the webbing retractor of an R seatbelt apparatus, (B) is a schematic block diagram which shows the electric ELR seatbelt apparatus which concerns on a present Example.

FIG. 4 is a schematic block diagram showing an electric ELR seat belt device according to a conventional example.

[Explanation of symbols]

 10 webbing retractor 11 seat belt device 14 retractor shaft 16 webbing 42 lock wheel (locking means) 70 pawl (locking means) 74 solenoid (lock actuating means) 88 limit switch 90 acceleration sensor (acceleration detection interrupting means) 92 buckle switch (Mounting detection shut-off means) 94 Ignition switch

Claims (1)

[Claims] 1. Locking means for preventing rotation of the take-up shaft in the webbing draw-out direction in a state where the webbing is taken out from a take-up shaft for taking up the webbing in layers in a predetermined amount or more; Lock actuating means for actuating the lock means when the webbing is pulled out by a predetermined amount or more and power can be supplied, and power to the lock actuating means by detecting an emergency state of the vehicle. In the non-engaged state of the tongue plate and the buckle for mounting the webbing and the acceleration detection shut-off means for shutting off the supply of the power, it is possible to supply power to the lock operating means, and in the engaged state and the ignition switch in the off state. An electric type E, which is equipped with a mounting detection cutoff means for cutting off the supply of power to the lock operating means.
LR seat belt device.