JP2013018460A - Seat belt device for automobile - Google Patents

Abstract

An object of the present invention is to prevent damage to a webbing and improve waist restraint.
The webbing is provided with a lock mechanism for locking the webbing drawer, and a force limiter mechanism for limiting the webbing load to a predetermined first load while the webbing drawer is locked by the locking mechanism. The seat belt retractor 12 that can be wound from the side, the lap outer pretensioner 16 that pulls in the other end of the webbing to generate a load on the webbing when a collision is detected, and the lap outer pretensioner 16 are operated. And a tongue plate 20 provided with a limiting mechanism for restricting movement relative to the webbing when a predetermined load is generated on the webbing, and an energy that operates by a second load smaller than a predetermined webbing damage load to absorb energy. The tongue plate 20 is detachably connected with an absorption mechanism. Includes a buckle 22, the.
[Selection] Figure 1

Description

  The present invention relates to an automotive seat belt device, and more particularly to an automotive seat belt device that reliably restrains an occupant and ensures safety in an emergency.

  As a seat belt device, various technologies such as a pretensioner for winding a webbing at the time of collision prediction have been proposed.

  For example, in the technique described in Patent Document 1, a pretensioner that pulls in the buckle to remove the slack of the webbing, an energy absorbing mechanism that is provided on the seat belt retractor side and that feeds the webbing when a predetermined load is exceeded, It has. And even if an energy absorption mechanism act | operates and webbing is drawn out, it has been proposed to prevent a passenger | crew's waist | hip | lumbar part from moving ahead with a webbing fastening tongue plate.

  In the technique disclosed in Patent Document 2, the first tension is generated by pulling the buckle, and the occupant is restrained within a range where the collision avoidance operation is possible. It has been proposed to include a second pretensioner mechanism that winds up the seat belt from the state and generates a second tension to restrain the occupant against the collision.

JP 2001-163179 A Japanese Patent No. 2946995

  In the technique described in Patent Document 1, the buckle side is pulled in to remove the slack of the webbing, and the webbing is tightened with the webbing tightening tongue plate. This prevents the occupant's waist from moving forward. Further, the shoulder belt load is absorbed by the energy absorption mechanism so as to be constant. However, the load on the lap belt increases when the waist moves forward while the webbing is tightened, so that the load on the lap belt increases compared to when the webbing tightening tongue plate is not applied. It is necessary to use a webbing having a higher load resistance than when no plate is applied.

  Further, in the technique described in Patent Document 2, the webbing is taken up by the second pretensioner mechanism and the occupant is restrained after removing the slack of the webbing by pulling the buckle by the first pretensioner mechanism. . Since the webbing is folded at the tongue plate and divided into the shoulder belt side and the lap belt side, when the second pretensioner is operated, the tension on the shoulder belt side tends to be higher than the tension on the lap belt side. There is room for improvement when considering the restraint of the waist.

  The present invention has been made in view of the above-described facts, and an object of the present invention is to prevent webbing damage and improve waist restraint.

  In order to achieve the above object, the invention described in claim 1 includes a lock mechanism for locking the webbing drawer, and a first webbing load determined in a state where the webbing drawer is locked by the lock mechanism. A seat belt retractor that has a force limiter mechanism that limits the load and is capable of winding the webbing from one end, and a pretensioner that pulls the other end of the webbing and generates a load on the webbing when a collision is detected Means, a tongue plate provided with a limiting mechanism for restricting movement relative to the webbing when the pretensioner means is actuated and a predetermined load is generated on the webbing, and a second load smaller than a predetermined webbing damage load. Equipped with an energy absorption mechanism that operates to absorb energy, and the tongue plate is removable It is characterized by and a buckle connected to.

  According to the first aspect of the present invention, the seat belt retractor includes a lock mechanism for locking the webbing drawer, and a first load in which the webbing load is predetermined in a state where the webbing drawer is locked by the lock mechanism. The webbing can be taken up by providing a force limiter mechanism that restricts the webbing. That is, when a load is generated on the webbing due to deceleration of the automobile, the webbing drawer is locked by the lock mechanism, and the webbing load is limited to the first load by the force limiter mechanism.

  The pretensioner means pulls the other end of the webbing to generate a load on the webbing when a collision is detected. Further, the tongue plate is provided with a restriction mechanism for restricting movement relative to the webbing when the pretensioner means is actuated to generate a predetermined load on the webbing. A tongue plate is detachably connected to the other end of the buckle.

  That is, by pulling in the other end of the webbing with the pretensioner means and restricting the movement of the webbing with the tongue plate restricting means, the initial waist restraint can be improved and the load on the thigh can be reduced. Can be reduced.

  However, when the pretensioner means and the tongue plate limiting mechanism operate together, the load on the lap belt side of the webbing may increase and damage the webbing. However, the buckle has a predetermined webbing damage load. An energy absorbing mechanism that operates by absorbing a smaller second load and absorbs energy is provided, whereby damage to the webbing can be reliably prevented. Therefore, waist restraint can be improved while preventing webbing damage.

  The energy absorbing mechanism may be set to operate with a load larger than the first load as the second load, as in the second aspect of the invention. Thereby, an occupant can be restrained efficiently.

  The seat belt retractor may further include a motor for winding the webbing before collision when it is determined that collision avoidance is impossible, as in the invention described in claim 3. That is, since the webbing is taken up by the motor after it is determined that collision avoidance is impossible, the operation timing can be delayed as much as possible to reduce the operation frequency of the motor. As a result, since the operation frequency is reduced, it is possible to wind the webbing with a stronger load than before, and it is possible to reliably restrain the occupant before the collision. Further, since the webbing can be wound with a strong load by the motor, the pretensioner configured to wind the webbing using an inflator, a micro gas generator (MGG), or the like can be eliminated.

  Furthermore, the structure which has a member which absorbs energy by carrying out the plastic deformation by a 2nd load may be applied to an energy absorption mechanism like the invention of Claim 4.

  As described above, according to the present invention, it is possible to prevent the webbing from being damaged and improve the waist restraint.

It is a figure showing a schematic structure of a seat belt device for cars concerning an embodiment of the invention. 1 is a diagram showing a schematic configuration of a seat belt retractor applicable to an automobile seat belt device according to an embodiment of the present invention. It is a figure showing a schematic structure of a lap outer pretensioner applicable to a seat belt device for vehicles concerning an embodiment of the invention. It is a figure which shows schematic structure of the tongue plate applicable to the seatbelt apparatus for motor vehicles concerning embodiment of this invention. It is a figure which shows schematic structure of the buckle part applicable to the seatbelt apparatus for motor vehicles concerning embodiment of this invention. It is a block diagram which shows the structure of the control system of the seatbelt apparatus for motor vehicles concerning embodiment of this invention. It is a flowchart which shows the flow of the process performed in the control system of the seatbelt apparatus for motor vehicles concerning embodiment of this invention. It is a figure for demonstrating the operation | movement order of each mechanism of the seatbelt apparatus for motor vehicles concerning embodiment of this invention. It is a figure which shows an example of the change of a shoulder belt load and a lap belt load when the seatbelt apparatus for motor vehicles concerning embodiment of this invention act | operates.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an automobile seat belt apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, an automobile seat belt apparatus 10 according to an embodiment of the present invention includes a seat belt retractor 12 disposed on a side surface of a vehicle body such as a center pillar. The seat belt retractor 12 includes a pretensioner mechanism (details will be described later) for winding the webbing 14.

  One end of the webbing 14 can be taken up by the seat belt retractor 12, and the other end is fixed to the side surface of the vehicle seat or the vehicle body via a lap outer pretensioner 16 described later.

  Further, a shoulder anchor 18 is provided above the seat belt retractor 12, and the webbing 14 is inserted therethrough.

  Further, a tongue plate 20 is movably provided on the webbing 14, and the occupant is restrained by engaging the tongue plate 20 with the buckle 22. In the present embodiment, the tongue plate 20 is provided with a lock mechanism for restricting the movement of the webbing relative to the tongue plate 20 when a predetermined load is applied to the webbing (details will be described later). The shoulder anchor 18 side of the webbing 14 from the tongue plate 20 is referred to as a shoulder belt, and the lap outer pretensioner side from the tongue plate 20 is referred to as a lap belt.

  Further, the tongue plate 20 can be inserted into one end of the buckle 22 and is connected to the tongue plate 20. On the other hand, the other end of the buckle 22 is fixed to the vehicle body or the seat side surface via an energy absorbing mechanism (details will be described later).

  Here, a specific configuration of the seat belt retractor 12 will be described. FIG. 2 is a diagram showing a schematic configuration of a seat belt retractor 12 applicable to the automobile seat belt device 10 according to the embodiment of the present invention.

  As shown in FIG. 2, the seat belt retractor 12 is provided with a spool 24 for winding the webbing 14, and a force limiter mechanism for keeping the tension of the webbing 14 constant.

  The spool 24 has a hollow central portion and is provided with a torsion bar 26 in the hollow portion. The torsion bar 26 constitutes a main part of the force limiter mechanism. The torsion bar 26 is connected to the spool 24 via a connecting member 27 in the vicinity of the center of the spool 24 and functions as a rotating shaft of the spool 24 and absorbs a load applied to the webbing load and keeps the load constant. Acts as a force limiter mechanism. Specifically, in the force limiter mechanism, when a tension exceeding a predetermined load is applied to the webbing 14 in a state where the spool 24 is locked by a lock mechanism 32 described later, the torsion bar 26 is twisted. As a result, the spool 24 connected to the torsion bar 26 via the connecting member 27 rotates and the webbing 14 is pulled out, so that the tension of the webbing 14 is kept constant.

  A pretensioner mechanism 28 is provided at one end of the torsion bar 26, and a spring mechanism 30 is provided at the other end.

  The spring mechanism 30 acts to urge the spool 24 in the winding direction, and the webbing 14 is wound around the spool 24 by the spring mechanism 30.

  The pretensioner mechanism 28 includes a lock mechanism 32 for locking the drawing of the webbing 14. The lock mechanism 32 is provided on the rotation shaft of the spool 24. The lock mechanism 32 is configured to lock the rotation of the spool 24 when a predetermined condition (such as when a predetermined load is applied to the spool or when a predetermined acceleration is applied to the automobile) is satisfied. Since various techniques are applicable, detailed description is omitted.

  The pretensioner mechanism 28 includes a pretensioner motor 34 and various gears. In the present embodiment, as shown in FIG. 2, the transmission gear 36 coupled to the lock mechanism 32 meshes with the pinion gear 40 connected to the rotation shaft of the pretensioner motor 34 via the reduction gear 38. Yes. That is, the webbing 14 can be wound around the spool 24 by driving the pretensioner motor 34. As the transmission gear 36, a planetary gear or the like constituted by a plurality of gears may be applied.

  Next, a specific configuration of the wrap outer pretensioner 16 will be described. FIG. 3 is a diagram showing a schematic configuration of a lap outer pretensioner 16 applicable to the automobile seat belt device 10 according to the embodiment of the present invention.

  Although various configurations can be applied to the wrap outer pretensioner 16, in this embodiment, by pulling the joint anchor 44 through the wire 42, tension is applied to the webbing 14 connected to the joint anchor 44. An example of such a configuration will be described.

  Specifically, the wrap outer pretensioner 16 includes a wire 42 having one end connected to the joint anchor 44, a piston (not shown) to which the other end of the wire 42 is fixed, and a cylinder into which the piston is slidably inserted. 46 and a micro gas generator (MGG) 48 that supplies gas from one end side of the cylinder 46.

  That is, by operating the MGG 48, gas is generated from one end side of the cylinder 46, and by moving the piston in the cylinder 46 by the pressure of the gas, the wire 42 is driven in the direction of the arrow in FIG. As a result, the joint anchor 44 connected to the wire 42 is pulled, whereby tension is applied to the webbing.

  Then, the specific structure of the tongue plate 20 provided with the lock mechanism is demonstrated. FIG. 4 is a diagram showing a schematic configuration of a tongue plate 20 applicable to the automobile seat belt device 10 according to the embodiment of the present invention. 4B and 4C are cross-sectional views taken along the line A-A ′ of FIG.

  The tongue plate 20 includes a tongue portion 50 that is connected to the buckle by being inserted into the buckle 22, and a main body portion 54 that is provided with an insertion hole 52 through which the webbing 14 is inserted.

  Further, as shown in FIG. 4B, a cam 56 is rotatably provided in an insertion hole 52 through which the webbing 14 is inserted in the main body portion 54 of the tongue plate 20 according to the present embodiment. The rotation of the cam 56 can limit the movement of the webbing 14 with respect to the tongue plate 20. That is, when the cam 56 is at the position shown in FIG. 4B, the webbing 14 can be moved, and as shown in FIG. 4C, the webbing 14 is pulled toward the lap belt with a predetermined load. In this case, the cam 56 rotates and the webbing 14 is sandwiched between the insertion hole 52 on the shoulder belt side and the cam 56, so that the movement of the webbing 14 is limited and the locked state is established. In addition, you may make it employ | adopt another structure as a lock mechanism which restrict | limits the movement of the webbing 14. FIG.

  Next, the energy absorption mechanism provided in the buckle 22 will be described. FIG. 5 is a diagram showing a schematic configuration of a buckle portion applicable to the automobile seat belt device 10 according to the embodiment of the present invention.

  The buckle 22 is provided with an energy absorption mechanism. The energy absorption mechanism 58 is formed of a metal plate formed in a zigzag shape, and one end of the metal portion rate is connected to the buckle 22 connected to the tongue plate 20. Connected. The other end is fixed to the vehicle body or the side of the seat.

  In the present embodiment, as shown in FIG. 5A, the occupant is restrained by inserting and connecting the tongue plate 20 to the buckle 22. In this state, when the load of the webbing 14 increases and exceeds a predetermined load, as shown in FIG. 5B, the zigzag portion of the metal plate constituting the energy absorbing mechanism 58 is stretched and plastically deformed. . Energy is absorbed by plastic deformation of the metal plate.

  In the present embodiment, the energy absorbing mechanism 58 is set so that the metal plate is plastically deformed with a load sufficiently smaller than the webbing damage load. In addition, the operating load of the energy absorbing mechanism 58 is set to a value larger than the load for releasing the webbing tension by the force limiter mechanism described above. That is, after the force limiter mechanism is activated first, the energy absorbing mechanism 58 is activated when the webbing load is further increased, and the movement of the webbing 14 with respect to the tongue plate 20 is restricted and the load is increased. Is to prevent.

  FIG. 6 is a block diagram showing a configuration of a control system of the automobile seat belt apparatus 10 according to the embodiment of the present invention.

  In the present embodiment, a pre-crash system 60 that predicts an automobile collision and a collision detection system 62 that detects an automobile collision are provided.

  The pre-crash system 60 includes a pre-crash ECU 64 that performs calculations for predicting a car collision.

  Various sensors for predicting an automobile collision are connected to the pre-crash ECU 64. In this embodiment, a radar 66, a vehicle speed sensor 68, an acceleration sensor 70, and a camera 72 are connected.

  For example, the radar 66 receives a radio wave reflected from an object by emitting a millimeter wave to the surroundings, and based on a propagation time, a frequency difference caused by the Doppler effect, or the like, a distance to the object or a relative speed with the own vehicle. It is possible to apply one that measures the above. The measurement result of the radar 66 is output to the pre-crash ECU 64.

  The vehicle speed sensor 68 is provided in a rotating part such as a transmission or a hub, and can detect a vehicle speed. The vehicle speed sensor 68 outputs a detection result to the pre-crash ECU 64.

  The acceleration sensor 70 detects acceleration generated by acceleration, deceleration, collision, or the like, and outputs the detection result to the pre-crash ECU 64.

  In addition, the camera 72 is provided to take an image of the surroundings of the automobile, detect surrounding obstacles, and measure the distance to the obstacle, and outputs the imaging results to the pre-crash ECU 64.

  Then, the pre-crash ECU 64 obtains the detection results of the radar 66, the vehicle speed sensor 68, and the acceleration sensor 70, and the imaging result of the camera 72, and predicts a collision. As a collision prediction method, for example, the time until the vehicle collides with the obstacle is calculated based on the input information, and the collision is possible when the calculated time becomes a predetermined time or less according to the vehicle speed or the like. It can be judged that there is sex.

  The pre-crash ECU 64 is connected to the pre-tensioner motor 34 described above, and controls the driving of the pre-tensioner motor 34 when a collision is predicted. As a result, the webbing 14 is wound around the spool 24 and the occupant is restrained by the shoulder belt.

  On the other hand, the collision detection system 62 includes an airbag ECU 74 for controlling the airbag that is deployed at the time of the collision.

  The airbag ECU 74 is connected to the acceleration sensor 70 and the vehicle speed sensor 68 described above, and is connected to an occupant detection sensor 76 and a buckle switch 78.

  The occupant detection sensor 76 detects, for example, a load applied to the seat cushion and outputs a detection result to the airbag ECU 74.

  The buckle switch 78 detects, for example, that the tongue plate 20 has been inserted, and outputs the detection result to the airbag ECU 74.

  The airbag ECU 74 controls the deployment of the airbag device provided in the automobile based on information obtained from the acceleration sensor 70, the vehicle speed sensor 68, the occupant detection sensor 76, and the buckle switch 78. .

  In addition, the airbag ECU 74 is connected to the wrap outer pretensioner 16 described above, and controls to ignite the MGG 48 of the wrap outer pretensioner 16 when a collision is detected by the airbag ECU 74. As a result, gas is generated from the MGG 48, the joint anchor 44 is pulled through the wire 42, and the occupant is restrained by the lap belt.

  Next, the operation of the automobile seat belt apparatus according to the embodiment of the present invention configured as described above will be described. FIG. 7 is a flowchart showing the flow of processing performed in the control system of the automobile seat belt apparatus 10 according to the embodiment of the present invention.

  First, in step 100, it is determined whether or not a collision has been predicted. This determination determines whether or not the pre-crash ECU 64 of the pre-crash system 60 has predicted a collision (whether or not collision avoidance is possible), waits until the determination is affirmed, and proceeds to step 102.

  In step 102, the pre-crash ECU 64 drives the pretensioner motor 34, whereby the webbing 14 is wound around the spool 24, and the process proceeds to step 104. Thus, when the pretensioner motor 34 is driven, the shoulder belt is wound up, and when the predetermined load is reached, the lock mechanism 32 of the seat belt retractor 12 is operated, and the webbing withdrawal is limited. .

  In step 104, it is determined whether or not a collision has been detected. This determination determines whether or not a collision has been detected by the airbag ECU 74. If the determination is negative, the process proceeds to step 106, and if the determination is affirmative, the process proceeds to step 110.

  In step 106, it is determined whether or not a collision has been avoided. The determination is made by determining whether or not the collision has been predicted by the pre-crash ECU 64 of the pre-crash system 60, thereby determining whether or not the collision has been avoided. If the determination is negative, the process returns to step 104. If the result is affirmative, the routine proceeds to step 108.

  In step 108, the pre-crash ECU 64 controls the pretensioner motor 34 to drive the webbing 14 in the opening direction (direction to pull out from the spool 24), thereby releasing the webbing tension and returning to step 100 to return to the above-described processing. Is repeated. Steps 106 and 108 are processing provided as fail-safe in the event that prediction is lost. In other words, in the present embodiment, when the collision avoidance is impossible, the pretensioner motor 34 is operated to wind up the webbing, and therefore the processing of steps 106 and 108 may be omitted.

  On the other hand, in step 110, the airbag ECU 74 controls and operates the lap outer pretensioner 16, thereby pulling the lap belt by the lap outer pretensioner 16 to restrain the occupant and end the series of processes. That is, when the wrap outer pretensioner 16 is operated, the cam 56 of the tongue plate 20 is rotated and locked as shown in FIG. 4C, and the movement of the webbing relative to the tongue plate 20 is limited. Thereafter, when the load on the shoulder belt and the load on the lap belt rise as the automobile decelerates, the force limiter mechanism of the seat belt retractor 12 operates to keep the load on the shoulder belt constant. Further, when the load further rises and the lap belt load rises, the energy absorbing mechanism 58 is activated to keep the lap belt load constant, thereby preventing the webbing from being damaged.

  Here, a specific operation example of the automobile seat belt device 10 will be described with reference to a transition example of a load applied by the webbing 14. FIG. 8 is a view for explaining the operation sequence of each mechanism of the automobile seat belt device 10 according to the embodiment of the present invention. FIG. 9 is a diagram showing an example of changes in the shoulder belt load and the lap belt load when the automobile seat belt device 10 according to the embodiment of the present invention is operated.

  In the present embodiment, as shown in FIG. 9A, the pretensioner motor 34 is operated to start winding of the shoulder belt after determining that the collision is confirmed (collision avoidance) as the collision prediction (FIG. 9). As shown in FIG. 8, the locking mechanism 32 of the seatbelt retractor 12 is activated when a constant load is reached after winding the shoulder belt (point B in FIG. 9), and the webbing 14 is pulled out. Limited.

  Conventionally, the webbing take-up operation is intended to eliminate the slack of the webbing before the collision, so it is necessary to operate the occupant before moving forward due to braking acceleration, etc. Operate. Therefore, since the operation frequency is high, the winding cannot be performed with a load that is strong enough to pull the occupant back. On the other hand, in this embodiment, since the pretensioner motor 34 is operated after the collision is determined as described above, the winding timing of the webbing 14 is delayed as much as possible, and the operation frequency of the pretensioner motor 34 is increased. Can be reduced. Accordingly, since the operation frequency is reduced, the webbing 14 can be wound with a load stronger than before, and the occupant can be reliably restrained before the collision. Further, since the webbing 14 can be wound with a strong load by the pretensioner motor 34, a pretensioner using an inflator, MGG, or the like can be eliminated.

  On the other hand, when a collision is detected by the airbag ECU 74 and the lap outer pretensioner 16 is actuated as shown in FIG. 8 (point C in FIG. 9), the tension of the lap belt and the tension of the shoulder belt increase. The cam 56 of the tongue plate 20 rotates and the locking mechanism of the tongue plate 20 operates (point D in FIG. 9). By the operation of the wrap outer pretensioner 16 and the lock mechanism operation of the tongue plate 20, the initial waist restraint can be improved, and the load on the thigh can be reduced.

  Thereafter, when the shoulder belt load and the lap belt load are further increased, as shown in FIG. 8, the force limiter mechanism of the seat belt retractor 12 is actuated to keep the shoulder belt load constant (point E in FIG. 9). When the load on the lap belt side further increases, the energy absorbing mechanism 58 operates (point F in FIG. 9), and the webbing 14 is prevented from being damaged.

  That is, by combining the lock mechanism of the tongue plate 20 and the energy absorption mechanism 58, it is possible to prevent the lap belt load from rising more than necessary and prevent the webbing 14 from being damaged. By reducing the tension at the bottom of the belt, an effect of reducing the amount of chest deflection can be expected.

  In the present embodiment, since the load at which the energy absorbing mechanism 58 operates is set to be sufficiently smaller than the damage load on the webbing 14, the lock mechanism of the tongue plate 20 operates to increase the load on the webbing 14. However, since the energy absorbing mechanism 58 operates before the webbing 14 is damaged, the webbing 14 can be reliably prevented from being damaged.

  Further, since the load Y at which the energy absorbing mechanism 58 operates is set to a larger value than the load X at which the force limit mechanism of the seat belt retractor 12 operates, the shoulder belt is activated by operating the force limiter mechanism first. The load can be kept constant and the load on the chest can be reduced. Subsequently, the energy absorbing mechanism 58 is operated, so that the lap belt load is kept constant and the load on the waist is released last. Therefore, the load on the thigh is reduced while restraining the waist. Can do. In other words, the occupant can be restrained efficiently by setting the load Y at which the energy absorbing mechanism 58 operates to be larger than the load X at which the force limiter mechanism operates.

  Therefore, by adopting the configuration as described above, it is possible to improve the waist restraint while preventing the webbing 14 from being damaged.

  In the above-described embodiment, the pre-crash system 60 and the collision detection system 62 have been described as separate configurations. However, the present invention is not limited to this, and various types of operations such as collision prediction and airbag control are performed by a single ECU as an integrated configuration. You may make it apply the structure which performs control. Further, the pre-crash system 60 is not an essential component and may be omitted.

  In the above embodiment, the energy absorbing mechanism 58 provided in the buckle 22 is one that absorbs energy by utilizing plastic deformation of a zigzag metal plate. However, the present invention is not limited to this. is not. For example, as in a force limiter mechanism of the seat belt retractor 12, energy may be absorbed using torsion of a torsion bar, or a configuration that absorbs other energy may be applied.

DESCRIPTION OF SYMBOLS 10 Automobile seat belt apparatus 12 Seat belt retractor 14 Webbing 16 Wrap outer pretensioner 20 Tang plate 22 Buckle 26 Torsion bar 28 Pretensioner mechanism 32 Lock mechanism 34 Pretensioner motor 48 MGG
56 cam 58 energy absorption mechanism

Claims (4)

A lock mechanism for locking the webbing drawer, and a force limiter mechanism for limiting the webbing load to a predetermined first load while the webbing drawer is locked by the lock mechanism are provided, and the webbing is wound from one end side. A retractable seat belt retractor;
Pretensioner means for pulling in the other end of the webbing to generate a load on the webbing when a collision is detected;
A tongue plate provided with a limiting mechanism for limiting movement relative to the webbing when the pretensioner means is actuated to generate a predetermined load on the webbing;
A buckle that includes an energy absorbing mechanism that operates with a second load smaller than a predetermined webbing damage load to absorb energy, and wherein the tongue plate is detachably coupled;
An automobile seat belt apparatus comprising:   2. The vehicle seat belt device according to claim 1, wherein the energy absorbing mechanism is set to operate with a load larger than the first load as the second load.   The automobile seat belt device according to claim 1, wherein the seat belt retractor further includes a motor that winds up the webbing before the collision when it is determined that the collision can not be avoided.   4. The vehicle seat belt device according to claim 1, wherein the energy absorption mechanism includes a member that absorbs energy by plastic deformation with the second load. 5.

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