JPH037240Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a webbing retractor for a seat belt device used to protect occupants in vehicle emergencies.

[Background technology]

There is a webbing retractor using two mainspring springs as a technique for optimizing the tension applied to the webbing when the occupant is wearing the webbing, and for optimizing the close contact force of the webbing to the occupant. This webbing take-up device uses a mainspring spring to bias the take-up shaft to which one end of the webbing is attached with a weak urging force when the passenger is wearing the webbing, and when the passenger is not wearing the webbing, the take-up shaft is biased. It is biased with a strong biasing force by two mainspring springs.

However, in the above-mentioned webbing retractor, a biasing force is applied to the webbing via the retracting shaft in accordance with the amount of webbing pulled out, so there is a problem in that the close force of the webbing to the occupant changes depending on the physique of the occupant wearing the webbing. There is. For example, if a large passenger wears webbing,
Since the amount of the webbing that is pulled out is large, the above-mentioned close contact force is large, which sometimes causes discomfort.

[Purpose of invention]

The present invention has been developed in view of the above-mentioned conventional problems, and its purpose is to provide a webbing wrapper that can maintain a constant contact force of the webbing against the occupant when the occupant is wearing the webbing, regardless of the occupant's physique. The objective is to provide a device for removing

[Summary of the idea]

In order to achieve the above object, the present invention provides a webbing winding elastic body whose one end is connected to the winding shaft of the webbing for occupant restraint, and whose one end is moved together with the winding shaft as the winding shaft rotates. , an actuator that moves the other end of the webbing take-up elastic body in the winding direction and pull-out direction of the occupant restraint webbing, and a first actuator that is rotated in accordance with the movement of the other end of the webbing take-up elastic body. a gear and a second gear which is rotated in accordance with the movement of the one end of the webbing winding elastic body;
a gear meshing with the first gear and the second gear;
a moving member that is moved according to the difference between the amount of rotation of the gear and the amount of rotation of the second gear; and detecting the position of the moving member to determine the relative position of the other end of the webbing winding elastic body with respect to the one end. a position detecting means for detecting the position; and an actuator is driven based on the output of the position detecting means, so that the other end of the webbing winding elastic body is positioned at a position where a predetermined winding force is applied to the webbing when the webbing is attached. and an actuator drive control device that controls the actuator to position the actuator.

[Effect]

In the present invention, the movable member is comprised of a first gear that rotates in accordance with the movement of the other end of the webbing winding elastic body and a second gear that rotates in response to the movement of one end of the webbing winding elastic body. The movement is made according to the difference in the amount of rotation between the two. Therefore, the moving member has a relative position with respect to one end of the other end of the webbing winding elastic body;
That is, the webbing is moved to a position corresponding to the winding force applied to the webbing. The position of this moving member is detected, and when the webbing is attached, the other end of the webbing winding elastic body is positioned at a position where a predetermined winding force is applied to the webbing based on the output of the position detection means. Therefore, a predetermined tension is applied to the webbing when the occupant is wearing the webbing, and the close force of the webbing to the occupant can be kept constant regardless of the occupant's physique. The relative position of one end of the elastic body for webbing winding with respect to the other end is detected by a gear, a moving member, and a position detecting means such as a switch that detects the position of the moving member. Since the winding force can be detected, a webbing winding device that achieves the above object can be obtained at a low cost.

[Example of idea]

Embodiments of the webbing retractor according to the present invention will be described below based on the drawings.

FIG. 1 shows this embodiment in an exploded manner.
Further, FIG. 2 shows a partial cross section thereof.

The frame 10 fixed to the vehicle body is a plate material having a U-shaped cross section, and has leg plates on both sides (only one leg plate 10A is shown in FIG. 1).

A winding shaft 12 is pivotally supported between both leg plates of the frame 10, and one end of a webbing 16 (not shown in FIG. 1) for restraining an occupant is connected to the cylindrical winding portion 14 of the winding shaft 12. ing.

A tongue plate 18 is attached to the other end of the webbing 16 as shown in FIG. 3, and the buckle device 20 shown in the figure can lock this by inserting the tongue plate 18.

In addition, in FIG. 3, illustration of the tongue plate engagement structure of the buckle device 20 is omitted.
Further, the buckle device 20 is installed upright on the vehicle body.

The winding shaft 12 winds up the webbing 16, and when the webbing 16 is pulled out and the tongue plate 18 is locked to the buckle device 20, the webbing 16 is attached to the passenger.

An inertia lock mechanism (not shown in FIG. 1) is connected to the shaft 22 of the take-up shaft 12 protruding from the leg plate on the opposite side of the leg plate 10A, and this inertia lock mechanism is activated in the event of a vehicle emergency to lock the webbing. 16 drawers can be prevented.

In this embodiment, the webbing 1
The winding of the vehicle 6 and its close contact with the passenger are carried out by the following configuration.

In FIG. 1, a spring case consisting of a spring case main body 24 and its cover 26 is attached to the outer surface of the leg plate 10A. The spring case body 24 is attached to the outer surface of the leg plate 10A with screws 28 and 30, and the cover 26 is attached to the spring case body 24 with screws 32 and 34.

A mainspring spring 36 as an elastic body for winding the webbing 16 is housed in this spring case, and its inner end extends from the leg plate 10A to the spring case main body 2.
The shaft 22 of the winding shaft 12 protrudes into the winding shaft 4.

A spring seat 38 is rotatably supported on the shaft 22 on the side closest to the leg plate 10A within the spring case body 24, and a worm, which is also rotatably supported on the shaft 22, is attached to the spring seat 38. A wheel 40 is fixed with screws so as to accommodate the mainspring spring 36.

Further, the outer side of the mainspring spring 36 is connected to its inner peripheral surface, and a worm gear 42 is meshed with the worm wheel 40. This worm gear 42 is a motor 4 attached to the inner surface of the spring case body 24 on the side of the leg plate 10A with screws 44 and 46.
8 (actuator), and therefore the motor 48 can drive the mainspring spring 36 in the webbing winding direction or the webbing pulling direction of the winding shaft 12.

Further, a seat 50 is fitted into the spring case body 24, and the seat 50 is attached to the worm wheel 4.
0 on the cover 26 side.

A round hole 52 is formed approximately in the center of this seat 50, and a gear 54 provided on the worm wheel 40 projects from the round hole 52 toward the cover 26 side.

Furthermore, gear support shafts 56, 58, and 60 are provided upright on the seat 50 and are directed toward the cover 26, and a gear 62 that meshes with the gear 54 is rotatably supported on the gear support shaft 56. There is.

A gear 64 is provided coaxially with this gear 62, and the gear 64 meshes with a gear 66 rotatably supported by the gear support shaft 58.

This gear 66 is also provided with a gear 68 coaxially, so that the driving force of the motor 48 is transmitted to the outer end of the mainspring spring 36 and the gear 4
2. Worm wheel 40, gears 54, 62, 6
4 and 66 to the gear 68.

In addition, a spring seat 38, a mainspring spring 3
6. A gear 70 is attached to the intermediate portion of the shaft 22 that passes through the worm wheel 40 and the seat 50 and projects from the gear 54.

This gear 70 meshes with a gear 72 rotatably supported by the gear support shaft 60.
A gear 74 is provided coaxially.

Therefore, the gear 74 is rotated via the shaft 22 and the gears 70 and 72 in accordance with the rotation of the winding shaft 12.

Here, a planetary gear mechanism is housed within the spring case.

The first gear 76 and the second gear 78 are the shaft 2
2, and a second gear 78 is housed within the first gear 76.

The first gear 76 is meshed with the gear 68, and the second gear 78 is meshed with the gear 74, so that the gear 76 can rotate to a rotational position corresponding to the position of the outer end of the mainspring spring 36. The gear 78 can rotate to a rotational position corresponding to the position of the inner end of the mainspring spring 36.

Further, a third gear 80 (a planetary gear in this embodiment) of the planetary gear mechanism is located between the gears 76 and 78 and meshes with the internal gear (not shown) of the gear 76 and the gear 78. and is rotatably supported by a shaft 82. This shaft 82 has a cam plate 84
The cam plate 84 is erected facing toward the cover 26, and the cam plate 84 is rotatably supported by the shaft 22 on the seat 50 side of the planetary gear mechanism.

Therefore, the third gear 80 is rotated and moved to a position corresponding to the difference between the amount of rotation of the first gear 76 and the amount of rotation of the second gear 78.

Furthermore, the position of the third gear 80 is detected by the following gear position detector.

A printed circuit board 86 is attached to the surface of the cam plate 84 on the seat 50 side, and an arcuate conductive layer 90A, as shown in FIG.
90B is formed.

Further, contacts 94A and 94B that are in contact with the conductor layer 90A, and contacts 96A and 96B that are in contact with the conductor layer 90B are attached to the sheet 50.
A, 94B, conductor layer 90B and contact 96
A, 96B to switch 100, 1 in FIG.
02 are formed respectively.

FIG. 5 shows the circuit configuration of the actuator drive control device that drives the motor 48.
In the figure, the switches 100, 102 and the buckle switch 104 are connected to a processing circuit 106 mainly composed of a microcomputer.

The buckle switch 104 is built into the buckle device 20 shown in FIG. The switch 110 is turned on by a lever 108.

Further, in FIG. 5, transistors 112 and 114 are turned on and off by the processing circuit 106, thereby driving and controlling relays 116 and 118, respectively.

The motor 48 is connected to these relays 116 and 118, so that the relay 1
When only one of 18 is driven, the motor 48 is driven in one direction, and when only the other is driven, the motor 48 is driven in the other direction.

In addition, in FIG. 5, the switches 100, 10
2, 104 has a 5V power supply voltage to regulator 1
20 through a resistor, and relay 1
16, 118, and the regulator 120 are supplied with a power supply voltage of 12V.

The present embodiment has the above configuration, and its operation will be explained below.

In FIG. 1, the gear 78 is connected to the winding shaft 12.
0, 72, and 74, when the winding shaft 12 is driven in the winding direction of the webbing 16, the winding shaft 12 is driven in the direction L in the figure, and the winding shaft 12 is driven in the direction in which the webbing 16 is pulled out. When it is rotated, it is rotated in the direction M in the figure.

Since the gear 76 is connected to the worm wheel 40 via the gears 54, 62, 64, 66, and 68, the worm wheel 40 is driven in the tensioning direction of the mainspring spring 36 (that is, in the winding direction of the webbing 16). When the worm wheel 40 is driven in the relaxation direction of the mainspring spring 36 (that is, the direction in which the webbing 16 is pulled out), the worm wheel 40 is rotated in the L direction.

Therefore, when the planetary gear 80 is moved in the L direction, the amount of extension of the mainspring spring 36 is reduced, and when the planetary gear 80 is moved in the M direction, the amount of extension is increased.

Therefore, there is a certain correlation between the amount of extension of the mainspring spring 36, that is, the force for winding the webbing 16 onto the winding shaft 12, and the movement position of the planetary gear 80.

In this embodiment, as shown in FIG. 4, the switch 100 is turned off with the conductor layer 90A and contacts 94A, 94B in a non-contact state, and the conductor layer 90B and contacts 96A, 96B in a non-contact state. When the switch 102 is turned off in this state, the force of the webbing 16 coming into close contact with the occupant when the webbing 16 is attached is smaller than in the past, and does not give a feeling of pressure to the occupant. .

Also, from this proper tension state, the planetary gear 8
0 moves in the M direction and the conductor layer 90A and the contacts 94A, 94B are in contact with each other, so that only the switch 100 is turned on.
The winding force of No. 6 is extremely large.

Then, when the planetary gear 80 moves in the L direction from the above-mentioned proper tension state and the conductor layer 90B and the contacts 96A, 96B come into contact with each other, so that only the switch 102 is turned on, the mainspring spring 36 expands. There is almost no amount, so the webbing 16 is not wound up.

As described above, there is a certain correlation between the winding force of the webbing 16 onto the winding shaft 12 and the moving position of the planetary gear 80, and the switches 100 and 102 are turned on and off depending on the winding force. It has been turned off.

The ON and OFF states of the switches 100 and 102 are monitored by the processing circuit 106 shown in FIG. 5, and the processing circuit 106 drives and controls the motor 48 in the following manner depending on their ON and OFF states.

FIG. 6 shows the processing procedure of the processing circuit 106. In the first step 200, it is determined whether or not the buckle flag, which is set when the buckle device 20 and the tongue plate 18 are disengaged, is set. ing.

This buckle flag is reset when the webbing 16 is stored in the webbing take-up device. Therefore, when the occupant puts on the webbing 16, it has been reset, and in step 200, it is determined that the buckle flag is not set, and the webbing 16 is reset.
Proceed to 202.

In this step 202, the buckle switch 104
It is determined whether the engagement between the buckle device 20 and the tongue plate 18 has been released by determining whether the buckle device 20 has changed from an on state to an off state.

When the occupant is pulling out the webbing 16, the buckle switch 104 is in the off state, and the tongue plate 18 is in the off state.
0 and the webbing 16 is being attached, the buckle switch 104 is in the on state, so in these cases, it is determined in step 202 that the engagement will not be released.

Once this determination is made, it is determined in step 204 whether the switch 100 is on, and in step 206 it is determined whether the switch 102 is on.

If a negative determination is made in both steps 204 and 206, the motor 48 is controlled to stop in step 208, and if a positive determination is made in step 204, the motor 48 is controlled in the direction in which the webbing 16 is pulled out. is driven in step 210, and then in step 206
If a positive determination is made in , the motor 48
is driven in the winding direction of the webbing 16 in step 212.

Through the above processing, the movement of the planetary gear 80 is controlled with the target position shown in FIG. 4, so that the webbing 16 is brought into the above-mentioned proper tension state.

Therefore, the webbing 16 can be easily pulled out with less force than before, and when the webbing 16 is attached, the force of contact with the occupant is moderate and does not give a feeling of pressure to the occupant.
Therefore, the occupant does not feel fatigued by wearing the webbing.

Next, a case will be described in which the webbing 16 is stored in the device after the operation is completed.

In this case, the engagement between the buckle device 20 and the tongue plate 18 is released and the buckle switch 10 is released.
4 changes from the on state to the off state.

As a result, a positive determination is made in step 202, a buckle flag is set in step 214, and a positive determination is made in step 200.
Proceed to step 216.

In step 216, it is determined whether the storage flag is set.

This storage flag is set when the webbing 16 is completely wound up in the webbing take-up device, and a process is performed to weaken the winding force of the webbing 16 in order to make it easier to pull out the webbing 16, as will be described later. It will be reset later. Therefore, a negative determination is made in step 216.

Based on this determination, the process advances to step 218, where it is determined whether the timer flag is set.

This timer flag is set when the timer starts, and is reset when the timer expires. Therefore, a negative determination is made in step 218 and the timer is started in step 220, after which a timer flag is set in step 222.

When the timer flag is set in step 222, an affirmative determination is made in step 218 and the process proceeds to step 224, where it is determined whether the timer has timed up.

If it is determined in step 224 that the timer has not timed up, the step
226, the motor 48 is driven in the winding direction of the webbing 16 for a predetermined period of time. Note that this operation of winding up the webbing 16 for a predetermined period of time is not performed if the timer does not time up and returns to step 226 again.

In this way, the mainspring spring 36 strongly biases the webbing 16 in the winding direction during the timer period as the winding operation is performed for the above-mentioned predetermined time, and the strong biasing force ensures that the webbing 16 is winding is performed.

When the timer times up, an affirmative determination is made in step 224.

Once this determination has been made, the process proceeds to step 228.
The timer flag is reset and the storage flag is set, and the setting of the storage flag causes an affirmative determination in step 216.

Then the steps 204, 206, 208, 210, 212
Similar processing is performed in steps 230, 232, 234, 236,
238, which causes the planetary gear 80 to move to the fourth position.
In the position shown in the figure, the webbing 16 is tensioned so that it can be easily pulled out. In the next step 238, the storage flag and buckle flag are reset.

As explained above, according to the present embodiment, a constant tension that does not give a feeling of pressure to the occupant while the webbing 16 is being worn can be applied to different physiques of the occupants.
Since the webbing 16 is controlled by the motor 48 regardless of the posture or seat position, the occupant will not feel fatigued by wearing the webbing 16.

Furthermore, since the tension of the webbing 16 during installation is reduced compared to the conventional one, the occupant can easily change his or her posture and move the seat.

Further, since the force for pulling out the webbing 16 is reduced by controlling the drive of the motor 48, the webbing 16 can be easily attached.

Then, the buckle device 20 and the tongue plate 1
When the engagement with the webbing 8 is released, the winding force of the webbing 16 is increased by drive control of the motor 48, so that the webbing 16 can be completely wound up as in the conventional device.

In addition, if the timer time of the above-mentioned timer is set to, for example, about 10 seconds, the webbing can be removed when the passenger gets off the vehicle.
Even if the webbing 16 is pulled, the pulling operation is generally within a few seconds, so it can be assumed that the webbing 16 is completely retracted due to the timer time-up. Therefore, the webbing 16 can be reliably and completely retracted. becomes.

FIG. 7 and FIG. 8 show a second embodiment of the device according to the present invention, and since the constituent parts not shown in the figures are the same as those in the previous embodiment, their explanation will be omitted. .

In FIG. 7, a printed circuit board 88 is attached to the surface of the gear 76 on the cover 26 side, and an arc-shaped conductor layer 93 is formed on the printed circuit board 88.

Also, contacts 97, 9 are provided on the inner surface of the cover 26.
8 is attached, and these contacts 9
7, 98 and the conductor layer 93 form a switch 122 in FIG.

This switch 122 is turned on when the gear 76 reaches a predetermined rotational position, and at this rotational position, the outer end of the mainspring spring 36 is driven to a position where a large predetermined winding force can be obtained.

The present embodiment has the above configuration, and its operation will be explained below.

The processing circuit 106 determines that sufficient biasing force for winding the webbing 16 is obtained when the switch 122 is turned on.

This determination is made in place of step 226 in FIG.
2 is not turned on and the outer end of the mainspring spring 36 is not driven to a position where a large predetermined winding force can be obtained, the motor 48 is driven in the winding direction, and the switch 122 is turned on. When it is determined that sufficient urging force is obtained for winding up the webbing 16, the motor 48
Control the stop.

This stop control is continued until it is determined in step 224 that the timer has timed up, and thereafter the same control operations as in the embodiment described above are performed.

As described above, in this embodiment, the other end of the mainspring spring 36 is controlled to stop at an accurate position where a constant and sufficient winding force can be obtained when winding the webbing 16 despite fluctuations in the power supply voltage of the motor 48, etc. Therefore, it is possible to completely store the webbing 16 without any error.

[Effect of idea]

As explained above, according to the present invention, it is possible to make the webbing close contact force to the occupant appropriate, so that the occupant does not feel fatigued by giving the occupant a feeling of pressure while wearing the webbing. It also makes it easier for passengers to change their posture and move their seats. Furthermore, it is possible to set the webbing contact force to an appropriate value even if the physiques of the occupants are different.

[Brief explanation of drawings]

Fig. 1 is an exploded view of the first embodiment of the device according to the present invention, Fig. 2 is a partial cross-sectional view of the first embodiment, Fig. 3 is an explanatory diagram of the configuration of the buckle switch, Fig. 4 is the substrate,
An explanatory diagram of the positional relationship between planetary gears and contacts, FIG. 5 is a circuit configuration diagram of the device according to the present invention, and FIG.
FIG. 7 is a flowchart for explaining the processing procedure of the processing circuit in the figure, FIG. FIG. 3 is an explanatory diagram of connections of the configured switch. 12... Winding shaft, 36... Mainspring spring, 48
...Motor, 76,78,80...Gear, 84...
...Cam plate, 86...Printed circuit board, 94
A, 94B, 96A, 96B...Contact, 1
06... Processing circuit, 116, 118... Relay.

Claims (1)

[Scope of utility model registration request] an elastic body for taking up webbing, one end of which is connected to a take-up shaft of the webbing for occupant restraint, and the one end of which is moved together with the take-up shaft as the take-up shaft rotates; and the other end of the elastic body for taking up webbing. an actuator that moves the webbing in the winding direction and the pull-out direction of the webbing for occupant restraint; a first gear that rotates in accordance with the movement of the other end of the webbing winding elastic body; a second gear that is rotated in accordance with the movement of one end; and a moving member that meshes with the first gear and the second gear and is moved in accordance with the difference between the amount of rotation of the first gear and the amount of rotation of the second gear. a position detecting means for detecting the position of the movable member and a relative position of the other end of the webbing winding elastic body with respect to the one end; an actuator drive control device that controls the other end of the webbing take-up elastic body to be located at a position where a predetermined take-up force is applied to the webbing when the webbing is attached;
A webbing take-up device comprising: