JP2012020606A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of improving restraining performance of a waist part, reducing tightening force of a chest part of an occupant, and improving operability of a tongue, while suppressing an increase in costs.SOLUTION: The seat belt device 1 includes a webbing 2, a seat belt retractor 3, a tongue 4, a first guide anchor 5, a buckle 6, and a second guide anchor 7. The webbing 2 is slidably guided from the seat belt retractor 3 to the first guide anchor 5, slidably guided by the second guide anchor 7 after being slidably inserted through an opening 41 formed at the tongue 4, again guided by the tongue 4, and connected to a rear end side from the opening 41. The tongue 4 includes a posture holding part 40 brought into contact with a surface of the webbing 2 to suppress the rotation when tension T is applied in a winding direction of the webbing 2 in a seat belt non-attaching state.

Description

  The present invention relates to a seat belt device used for a vehicle such as an automobile, and more particularly to a seat belt device capable of achieving both improvement in restraining performance and operability of a waist.

  2. Description of the Related Art A vehicle such as an automobile is generally provided with a three-point seat belt device that restrains an occupant on a seat that includes a seat portion on which the occupant sits and a backrest portion that is positioned on the back of the occupant. Such a seat belt device includes a webbing that restrains an occupant, a seat belt retractor that winds the webbing, a guide anchor that is provided on the vehicle body side and guides the webbing, and a belt anchor that fixes the webbing to the vehicle body side. A buckle disposed on the side surface of the seat and a tongue disposed on the webbing, and the occupant is restrained by the webbing by fitting the tongue to the buckle.

  The webbing is divided into a shoulder portion that is spanned between the guide anchor and the buckle and a wrap portion that is spanned between the buckle and the belt anchor when the seat belt is worn, The occupant's lower back is restrained and the occupant's chest is restrained by the shoulder.

  By the way, when a vehicle collision or sudden deceleration occurs when the seat belt is worn, the occupant tends to move forward by inertial force. The seat belt retractor has a pretensioner that winds up the webbing and restrains the occupant in an emergency such as a collision or sudden deceleration, and a lock mechanism that locks the webbing so that it is not pulled out. However, since the webbing is divided into a wrap part and a shoulder part by the tongue, the action of the seat belt retractor mainly acts on the shoulder part. As a result, depending on vehicle conditions, a submarine phenomenon may occur in which an occupant passes through the lap and moves forward. In order to suppress such a submarine phenomenon, a method of improving the restraining performance of the lap portion by pulling in or moving the buckle in an emergency has been proposed (for example, see Patent Document 1).

  Similarly, as a method for suppressing the submarine phenomenon, for example, seat belt devices described in Patent Document 2 and Patent Document 3 have been proposed. The seat belt device described in these patent documents includes a webbing for restraining an occupant, a seat belt retractor for winding the webbing, a tongue connected to a tip of the webbing, and the webbing provided on the vehicle body side. A first guide anchor that guides the vehicle, a buckle disposed on a side surface of the seat, and a second guide anchor disposed on a side surface of the seat opposite to the buckle, and the webbing from the seat belt retractor After being guided by the first guide anchor and inserted through the tongue, the guide is guided by the second guide anchor and again guided by the tongue. In such a seat belt device, when the tongue is fitted to the buckle, the lap portion is configured in a double manner.

JP 2004-161037 A JP 49-104323 A JP 2004-50914 A

  However, the invention described in Patent Document 1 requires a gas generator and a dedicated moving mechanism, resulting in an increase in the number of parts and an increase in production cost.

  In addition, in the invention described in Patent Document 2, since the pulley is arranged at the portion corresponding to the second guide anchor and the connecting portion between the tongue and the webbing, when the occupant's waist is about to move forward, The load applied to the lap portion is transmitted to the shoulder portion as it is, and there is a problem that the tightening force of the occupant's chest increases.

  Further, in the invention described in Patent Document 3, the anchor plate corresponding to the second guide anchor has a structure that makes it difficult to slide the webbing. Therefore, when the pretensioner of the seat belt retractor is operated, the webbing of the lap portion is performed. There was a problem that it was difficult to pull in and it was difficult to improve the restraining performance of the waist.

  Furthermore, in the seat belt apparatus in which the lap portion is doubled when the seat belt is mounted as described in Patent Document 2 and Patent Document 3, the tongue is connected by the winding operation of the webbing when the seat belt is not mounted. The portion is pulled downward and rotated, and the tip end portion (engagement portion with the buckle) side of the tongue is directed upward, so that the occupant is difficult to grasp the tongue and the operability is poor.

  The present invention has been devised in view of the above-described problems, can suppress the increase in cost, can improve the restraint performance of the waist, can reduce the tightening force of the chest of the occupant, An object of the present invention is to provide a seat belt device capable of improving operability.

  According to the present invention, there is provided a seatbelt device for restraining the occupant to a seat having a seat portion on which the occupant sits and a backrest portion located on the back surface of the occupant, the webbing for restraining the occupant, and the webbing A seat belt retractor that winds up, a tongue that is connected to the tip of the webbing, a first guide anchor that is provided on the vehicle body side and guides the webbing, and a tip of the tongue that is disposed on a side surface of the seat An engaging buckle; and a second guide anchor disposed on a side surface of the seat opposite to the buckle, wherein the webbing is slidably guided from the seat belt retractor to the first guide anchor. And after being slidably inserted through the opening formed in the tongue, the second guide anchor is slidably guided, and again the The tongue is connected to the rear end side of the opening, and the tongue contacts the surface of the webbing when tension is applied in the winding direction of the webbing when the seat belt is not attached. Thus, there is provided a seat belt device characterized by having a posture holding portion for suppressing rotation.

  The webbing includes a shoulder portion spanned between the first guide anchor and the tongue, and a lap portion spanned between the tongue and the second guide anchor, and the wrap The first wrap portion spanned between the opening of the tongue and the second guide anchor, and the second wrap spanned between the second guide anchor and the connecting portion of the tongue. The first wrap portion may be disposed on the lower side and the second wrap portion may be disposed on the upper side when the seat belt is worn.

  When the webbing is wound up with the seat belt attached, the tongue and the second guide are movable in the direction in which the first wrap portion and the second wrap portion are pulled into the seat belt retractor. You may be guided by the anchor.

  The second guide anchor may have the same configuration as the first guide anchor. Here, “the same configuration” means “substantially the same configuration”, and it is sufficient that at least the webbing insertion portion has the same configuration, and the outer shape, size, mounting means on the vehicle body side, etc. It means that it can be changed.

  The tongue is configured such that, for example, the posture holding unit is disposed closer to the seat than the webbing in a state where the seat belt is not attached.

  The tongue includes a main body portion including the opening, a connection portion with the webbing, and an engagement portion with the buckle, and a cover member connected to the main body portion, and the cover member is in the posture. You may comprise the holding | maintenance part.

  The posture holding portion may be configured by a webbing insertion portion formed at a position in parallel with or higher than the connecting portion of the tongue.

  According to the seat belt device of the present invention described above, one end of the webbing is connected to the seat belt retractor, the other end is connected to the tongue, and the intermediate portion is connected to the first guide anchor, the tongue opening, and the second guide anchor. By guiding each slidably, the webbing of the lap portion can be easily pulled in when the pretensioner is operated, and the restraining performance of the waist can be improved. In addition, since no rotating parts such as pulleys are used to guide the webbing, the load applied to the lap part is not transmitted to the shoulder part as it is, and the tightening force of the occupant's chest is reduced. Can do. Furthermore, by forming the posture holding portion on the tongue, the rotation of the tongue when the seat belt is not worn can be suppressed, and the operability of the tongue can be improved. In addition, by adopting a seat belt device in which the lap portion is doubled when the seat belt is mounted, an increase in the number of parts and an increase in production cost can be suppressed, and an increase in cost can be suppressed.

  In addition, the webbing wrap part is composed of a first wrap part and a second wrap part, the first wrap part connected to the shoulder part is on the lower side, and the second wrap part connected to the first wrap part is on the upper side. By arrange | positioning, it can make it easy to draw in a lap | wrap part via a shoulder part at the time of the action | operation of a pretensioner, and the restraint performance of a waist | hip | lumbar part can be improved. In addition, when the occupant comes into contact with the first lap portion by the forward movement of the occupant (that is, when a load is applied to the lap portion), the length of the first wrap portion is between the tongue and the second guide anchor. It is easy to fix, it is difficult to transmit the load applied to the lap portion to the shoulder portion, and the tightening force of the chest of the occupant can be reduced.

  In addition, the webbing can be effectively slid by guiding the webbing to the tongue and the second guide anchor so that the first wrap part and the second lap part can move when the pretensioner is operated. , Waist restraint performance can be improved.

  In addition, by making the second guide anchor the same configuration as the first guide anchor, the conventional first guide anchor excellent in slidability and anti-reversal performance can be used as the second guide anchor. There is no need to produce new parts, and cost increases can be suppressed.

  Further, by disposing the posture holding unit on the seat side of the tongue, it is possible to easily configure the posture holding unit suitable for the seat belt device in which the lap portion is doubled when the seat belt is mounted.

  In addition, the tongue is composed of a main body and a cover member, and the posture holding portion is formed on the cover member, so that it is suitable for a seat belt device having a simple configuration and a lap portion being doubled when the seat belt is mounted. A tongue can be constructed.

  In addition, when the posture holding part is configured by a webbing insertion part formed in parallel with or higher than the tongue connection part, the tongue connection part is pulled downward by winding the webbing. However, the webbing insertion portion contacts the surface of the webbing, and the rotation of the tongue can be easily suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general view which shows embodiment of the seatbelt apparatus which concerns on this invention, (A) is a seatbelt non-wearing state, (B) is a seatbelt wearing state. It is a figure which shows the effect | action of the seatbelt apparatus shown in FIG. 1, (A) at the time of seat belt non-wearing, (B) at the time of seat belt wearing, (C) at the time of pretensioner operation, (D) at the time of emergency , Shows. It is explanatory drawing of the tongue shown in FIG. 1, (A) is a top view, (B) has shown the side view. It is a figure which shows the effect | action of the tongue shown in FIG. 3, (A) has shown the low tension state, (B) has shown the high tension state. It is a figure which shows the modification of a tongue, (A) is a 1st modification, (B) is a 2nd modification, (C) has shown the 3rd modification.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is an overall view showing an embodiment of a seat belt device according to the present invention, in which (A) is a seat belt non-mounted state, and (B) is a seat belt mounted state. 2 is a diagram showing the operation of the seat belt device shown in FIG. 1, wherein (A) is when the seat belt is not worn, (B) is when the seat belt is worn, (C) is when the pretensioner is activated, (D) shows an emergency. In FIG. 1, the occupant's drawing is omitted.

  As shown in FIGS. 1 (A) and 1 (B), an embodiment of a seat belt device 1 according to the present invention includes a seat S including a seat portion S1 on which an occupant sits and a backrest portion S2 positioned on the back surface of the occupant. A seat belt device 1 for restraining an occupant is provided with a webbing 2 for restraining the occupant, a seat belt retractor 3 for winding the webbing 2, a tongue 4 connected to the tip of the webbing 2, and a vehicle body side. A first guide anchor 5 that guides the webbing 2, a buckle 6 that is disposed on the side surface of the sheet S and that engages with the tip of the tongue 4, and a second guide that is disposed on the side surface of the sheet S opposite to the buckle 6. The webbing 2 is slidably guided from the seat belt retractor 3 to the first guide anchor 5 and is slidably inserted into an opening 41 formed in the tongue 4. After that, the second guide anchor 7 is slidably guided, is guided again by the tongue 4, and is connected to the rear end side of the opening 41. When a tension is applied in the winding direction of the webbing, the posture holding unit 40 is brought into contact with the surface of the webbing 2 to suppress rotation. Here, the case where the seat S is a passenger seat is illustrated.

  The webbing 2 has one end connected to the seat belt retractor 3, the other end connected to the tongue 4, and an intermediate portion connected to each of the first guide anchor 5, the opening 41 of the tongue 4, and the second guide anchor 7. As will be described later, the wrap portion 22 is doubled when the seat belt is worn. When the seat belt device 1 having such a configuration is employed, an increase in the number of parts and an increase in production cost can be suppressed, and cost reduction can be achieved.

  Specifically, as shown in FIG. 1B, the webbing 2 includes a shoulder portion 21 spanned between the first guide anchor 5 and the tongue 4, and the tongue 4 and the second guide anchor 7. A wrap portion 22 spanned between the first wrap portion 22a spanned between the opening 41 of the tongue 4 and the second guide anchor 7, and a second wrap portion 22. The second wrap portion 22b spanned between the guide anchor 7 and the connecting portion 42 of the tongue 4 is configured to be double, and when the seat belt is worn, the first wrap portion 22a is disposed on the lower side, The two wrap portions 22b are configured to be disposed on the upper side.

  Further, the webbing 2 can be moved in the direction in which the first wrap part 22a and the second wrap part 22b are pulled into the seat belt retractor 3 when the webbing 2 is wound up with the seat belt mounted. Guided by the guide anchor 7.

  The present embodiment is characterized in that the intermediate portion of the webbing 2 is slidably guided by the first guide anchor 5, the tongue 4 and the second guide anchor 7, respectively. That is, the webbing 2 is guided so as to generate a certain frictional force with each of the first guide anchor 5, the tongue 4 and the second guide anchor 7. In addition, the structure of the 1st guide anchor 5, the tongue 4, and the 2nd guide anchor 7 is mentioned later.

  The seat belt retractor 3 generally includes a spool to which one end of the webbing 2 is connected, a spring for imparting a winding force to the spool, a lock mechanism for stopping the webbing 2 from being pulled out, And a pretensioner that instantaneously winds the webbing 2 in an emergency such as sudden deceleration. Such a pretensioner is often composed of a gas generator connected to an ECU (electronic control unit), and when the ECU predicts or detects an emergency, a signal is transmitted to the gas generator and the gas generator is activated. As a result, the spool is instantaneously rotated to wind up the webbing 2. The seat belt retractor 3 may have a motor that substitutes or assists the spring spring, or may use a motor-type pretensioner instead of the explosive-type pretensioner. The seat belt retractor 3 is built in, for example, the center pillar of the vehicle body or the seat S. As the seat belt retractor 3, those conventionally used in general can be arbitrarily used, and other detailed description is omitted.

  The first guide anchor 5 is generally a part obtained by molding a resin on a metal core, and is disposed on the vehicle body side such as a center pillar. The first guide anchor 5 has an insertion hole through which the webbing 2 is inserted, and a guide piece for slidably guiding the webbing 2 is often embedded in the insertion hole. The insertion hole has a gap of about one to two sheets of the webbing 2, and both end portions often have a rolled up shape to suppress jamming (deviation) of the webbing 2. The guide piece is made of, for example, a metal material or a resin material having a low friction coefficient. In addition, what was generally used conventionally can be arbitrarily used for this 1st guide anchor 5, and other detailed description is abbreviate | omitted.

  The buckle 6 is a device that removably fixes the engaging portion 43 of the tongue 4. For example, the buckle 6 has a pin that can be engaged with the engaging portion 43 of the tongue 4, and when the engaging portion 43 of the tongue 4 is inserted into the slot portion formed at the top of the buckle 6, the pin is engaged, By operating a button arranged on the surface of the buckle 6, the engagement of the pin is released and the tongue 4 can be detached from the buckle 6. Moreover, the buckle 6 is fixed to the side surface portion of the seat portion S1 of the seat S or the floor surface portion of the vehicle body by, for example, a metal anchor. As the buckle 6, any conventionally used one can be arbitrarily used, and other detailed description is omitted.

  The second guide anchor 7 is a part corresponding to a conventional belt anchor or anchor plate. As shown in the figure, the buckle 6 and the seat S of the seat S are disposed on the opposite side with respect to each other. Here, the case where it is directly fixed to the side surface portion of the seat portion S1 of the seat S is illustrated, but it may be fixed to the side surface portion of the seat portion S1 or the floor surface portion of the vehicle body via a metal anchor. .

  In the present embodiment, the second guide anchor 7 is a component that guides the webbing 2 in a slidable manner. Therefore, the second guide anchor 7 is required to have the same function although the arrangement position is different from that of the first guide anchor 5. Therefore, the second guide anchor 7 shown in the present embodiment has the same configuration as the first guide anchor 5. That is, the second guide anchor 7 is a part obtained by molding a resin on a metal core, similar to the first guide anchor 5. For example, the second guide anchor 7 slides the webbing 2 through an insertion hole through which the webbing 2 is inserted. And a guide piece that is movably guided.

  Thus, by making the 2nd guide anchor 7 the same structure as the 1st guide anchor 5, the 1st guide anchor 5 excellent in slidability and inversion prevention performance can be used as the 2nd guide anchor 7. The second guide anchor 7 suitable for this embodiment can be obtained without producing new parts, and the cost increase can be suppressed. The “same configuration” means “substantially the same configuration”, as long as at least the webbing insertion portion has the same configuration, and the outer shape, size, mounting means on the vehicle body side, etc. are changed as appropriate. Means you can.

  The tongue 4 is a component that is connected to the tip of the webbing 2 and holds the intermediate part of the webbing 2 in a slidable manner. The occupant is restrained to the seat S by the webbing 2 by being fitted to the buckle 6. Here, FIG. 3 is an explanatory view of the tongue shown in FIG. 1, in which (A) is a plan view and (B) is a side view.

  The tongue 4 shown in FIG. 3 includes an opening 41, a connection part 42 with the webbing 2, and a body part 4a provided with an engagement part 43 with the buckle 6, and a cover member 4b connected to the body part 4a. And the cover member 4 b constitutes the posture holding unit 40. With this configuration, the tongue 4 suitable for the seat belt device 1 in which the lap portion 22 is doubled when the seat belt is mounted can be configured with a simple configuration.

  The opening 41 is a portion through which the intermediate portion of the webbing 2 is inserted. Since the opening 41 is a portion that guides the webbing 2 so as to be slidable, the opening 41 has a gap that is at least equal to the thickness of the webbing 2 and has a size that does not easily reverse the webbing 2, for example, the webbing 2. It is composed of a gap of about 1 to 2 sheets.

  The connection part 42 is a core part formed by the connection opening part 42a formed on the rear end side of the opening part 41 and the main body part 4a. As shown in FIG. 3 (B), the webbing 2 is fixed to the connection part 42 by having its tip part inserted through the connection opening 42a and then folded and sewn to itself. Further, the connecting portion 42 is formed so that its position is shifted to the pillar side with respect to the opening portion 41 and the engaging portion 43. With this configuration, the webbing 2 can be easily connected, and interference between the webbing 2 connected to the connection part 42 and the webbing 2 inserted through the opening 41 can be suppressed. The illustrated webbing 2 connection method is merely an example, and may be fixed by a fixing bracket such as a bolt or a rivet.

  The engaging portion 43 is a part of a metal part that constitutes the core of the main body portion 4a, and has an engaging opening 43a. The engaging portion 43 protrudes from the distal end side of the main body portion 4a, and an engaging opening 43a is formed in a substantially central portion. The engaging opening 43 a is a portion that engages with the pin of the buckle 6.

  The cover member 4 b is a component that is mounted on the surface of the main body portion 4 a and has a covering surface disposed on the sheet S side of the main body portion 4 a, and this covering surface constitutes the posture holding portion 40. Further, the cover member 4b has an opening 4c through which the engaging portion 43 can be inserted, and the opening 4c is inserted through the engaging portion 43 so as to be engageable with the main body portion 4a. The method of engaging the cover member 4b and the main body 4a may be a method of engaging the engaging claw with the recess, or an engaging method using a fixing bracket such as a bolt or a rivet. As shown in FIG. 3B, in the state where the cover member 4b is engaged with the main body portion 4a, a gap through which the webbing 2 can be inserted is formed between the posture holding portion 40 and the main body portion 4a. . Further, the surface of the cover member 4b opposite to the posture holding portion 40 has an opening or a notch through which the webbing 2 can be inserted.

  The posture holding portion 40 is a portion that can come into contact with the surface of the webbing 2, and a position substantially parallel to the connecting portion 42 of the tongue 4, for example, as shown in FIG. It is formed to a position adjacent to the portion 42a. Here, the outer shape of the end portion of the posture holding unit 40 is formed in an arc shape, but is not limited thereto, and may be a linear shape or another curved shape. The operation of the posture holding unit 40 will be described later.

  Next, the operation of the above-described seat belt device 1 when the seat belt is mounted will be described with reference to FIG. In addition, in each figure of FIG. 2, the figure is abbreviate | omitted about the center pillar in which the seatbelt retractor 3 is incorporated and the 1st guide anchor 5 is arrange | positioned.

  FIG. 2A shows a state before the occupant P is seated on the seat S, that is, a state where the seat belt is not worn (used). At this time, the webbing 2 is stretched along the center pillar on the door side of the vehicle body. At this time, the tongue 4 is locked to the webbing 2 with the distal end portion (engagement portion 43) facing downward by the action of a posture holding portion 40 described later.

  FIG. 2B shows a state where an occupant P is seated on the seat S and a seat belt is attached. The occupant P seated on the seat S pulls the tongue 4 to engage with the buckle 6. At this time, the webbing 2 includes a shoulder portion 21 spanned between the first guide anchor 5 and the tongue 4 and a lap portion 22 spanned between the tongue 4 and the second guide anchor 7. And the wrap portion 22 is between the first wrap portion 22a spanned between the opening 41 of the tongue 4 and the second guide anchor 7, and between the second guide anchor 7 and the connection portion 42 of the tongue 4. And the second wrap portion 22b spanned between the two. Further, in the double wrap portion 22, the first wrap portion 22a continuous with the shoulder portion 21 is disposed on the lower side, and the second wrap portion 22b continuous with the first wrap portion 22a is disposed on the upper side. Yes.

  FIG. 2C shows a state in which the pretensioner of the seat belt retractor 3 is activated. When an emergency such as a vehicle collision or a sudden deceleration is predicted or detected, the pretensioner of the seat belt retractor 3 is activated to drive the spool of the seat belt retractor 3 in the direction in which the webbing 2 is wound up. Since the webbing 2 is slidably guided by the first guide anchor 5, the shoulder portion 21 is drawn in the direction a in the figure. Further, since the webbing 2 is guided by the tongue 4 so as to be slidable, the first wrap portion 22a is drawn in the direction b in the figure. Further, since the webbing 2 is slidably guided by the second guide anchor 7, the second wrap portion 22b is pulled in the direction c in the figure. That is, the webbing 2 can move in the direction in which the first wrap portion 22a and the second wrap portion 22b are pulled into the seat belt retractor 3 when the pretensioner is operated, so that the first guide anchor 5, the tongue 4 and the second guide anchor. 7 is guided.

  With this configuration, when the pretensioner of the seat belt retractor 3 is operated, the webbing 2 of the lap portion 22 can be easily pulled in, and the length of the lap portion 22 (the first wrap portion 22a and the second wrap portion 22b) can be reduced. The occupant P can be tightened with the lap portion 22 and the restraining performance of the waist can be improved.

  FIG. 2D shows a state after the pretensioner is activated in an emergency such as a vehicle collision or a sudden deceleration. The seat belt retractor 3 after the pretensioner is operated locks the webbing 2 so that the webbing 2 is not pulled out by the lock mechanism. In such an emergency, the occupant P tries to move forward by inertial force. At this time, a load in the direction d in the figure is input to the wrap portion 22 (directly the first wrap portion 22a) of the webbing 2. Since the webbing 2 spanned between the tongue 4 and the second guide anchor 7 is guided so as to be difficult to slide due to the frictional force generated by the load in the d direction, the first lap portion 22a is pulled out. The length is fixed without being damaged. In addition, a load in the d direction is input to the second wrap portion 22b via the first wrap portion 22a. However, the second wrap portion 22b has a tension acting in a direction in which it is drawn by the pretensioner. Since the tension acting on the first wrap portion 22a and the second wrap portion 22b is balanced, the length of the second wrap portion 22b is fixed without being pulled out. Therefore, the wrap part 22 can improve the restraint performance of the occupant P at the waist, and can restrain the occupant P effectively.

  Further, since the webbing 2 is not pulled out to the wrap portion 22, the load applied to the wrap portion 22 is not transmitted to the shoulder portion 21 as it is, and the tightening force of the chest of the occupant P can be reduced. . Further, by improving the restraining performance of the waist, the upper body of the occupant P can be bent at an early stage, and the so-called submarine phenomenon can be effectively suppressed while the occupant P is restrained by the shoulder portion 21. it can. When an impact absorbing mechanism such as a torsion bar is formed on the seat belt retractor 3, the impact when the occupant P is restrained by the shoulder portion 21 can be effectively mitigated.

  Next, the operation of the above-described seat belt device 1 when the seat belt is not worn will be described with reference to FIG. 4A and 4B are diagrams showing the action of the tongue shown in FIG. 3, wherein FIG. 4A shows a low tension state and FIG. 4B shows a high tension state.

  As shown in FIGS. 4A and 4B, the tongue 4 includes a metal core material 44 and a resin portion 45 that covers the core material 44. The exposed portion of the core member 44 constitutes the engaging portion 43, and the resin portion 45 constitutes the outer shape of the main body portion 4a. The resin portion 45 is made of, for example, a nylon resin from the viewpoint of slidability and strength. The cover member 4b is also preferably formed of a resin, but is not required to be as strong as the main body 4a, and thus is made of, for example, an inexpensive polypropylene resin. In this way, it is possible to suppress an increase in cost by producing each part with a material suitable for each function.

  As shown in FIG. 4A, the webbing 2 has an intermediate part inserted through the opening 41 of the tongue 4 and a tip part connected to the connection part 42 of the tongue 4. Further, the posture holding unit 40 configured by the cover member 4 b is disposed on the seat side with respect to the webbing 2. In this way, by disposing the posture holding unit 40 on the seat side of the tongue 4, the posture holding unit 40 suitable for the seat belt device 1 in which the lap unit 22 is doubled when the seat belt is mounted is easily configured. be able to. When the tension of the webbing 2 is low, the tongue 4 is locked to the webbing 2 with the engagement portion 43 facing downward due to its own weight.

  As shown in FIG. 4B, when the webbing 2 is wound up or the like due to high tension, the webbing 2 inserted through the opening 41 is pulled upward and connected to the connection part 42. The webbing 2 is pulled downward. Therefore, the tongue 4 tries to rotate to the sheet side. Then, the posture holding unit 40 comes into contact with the surface of the webbing 2. However, since sufficient tension acts on the webbing 2, the movement of the posture holding unit 40 is prevented. Therefore, the rotation of the tongue 4 is suppressed, and the tip of the tongue 4 (engagement portion 43) can be made difficult to be in an upward state. As a result, when the occupant P seated on the seat S tries to engage the tongue 4 with the buckle 6, the tongue 4 can be easily grasped and the operability can be improved.

  Finally, a modified example of the tongue 4 will be described. Here, FIG. 5 is a figure which shows the modification of a tongue, (A) has shown the 1st modification, (B) has shown the 2nd modification, (C) has shown the 3rd modification. In addition, in each figure, about the same component as the tongue 4 shown in FIG. 4, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The first modification shown in FIG. 5A is formed by shifting the resin part 45 and the connection part 42 constituting the opening 41 to the pillar side. According to this configuration, the gap between the main body 4a and the cover member 4b can be formed wide, and the webbing 2 can be easily inserted into the opening 41. According to the first modified example, similarly to the embodiment shown in FIG. 4, the rotation of the tongue 4 can be suppressed by the posture holding unit 40, and the operability can be improved.

  In the second modification shown in FIG. 5 (B), instead of the cover member 4b, a protrusion 46 having a webbing insertion hole 46a is formed in the connecting portion 42 of the main body 4a. Also by the protrusion 46, when the tongue 4 tries to rotate to the sheet S side, the inner surface of the webbing insertion hole 46a constitutes the posture holding portion 40, and the rotation of the tongue 4 can be suppressed, and the operability is improved. Can be improved.

  In the third modified example shown in FIG. 5C, the protrusion 47 has an opening 41 that serves as both the opening 41 for connection and the connection opening 42 a of the connection 42, and has a webbing insertion hole 47 a above the connection 42. Is formed. At this time, in order to make it easy to insert the webbing 2 and to make it easy to slide, it is preferable that the connecting portion 42 is formed to be shifted to the pillar side. The intermediate portion of the webbing 2 is inserted so as to meander through the opening 41 and the webbing insertion hole 47a, and the tip of the webbing 2 is wound around and connected to the connection portion. Even with this configuration, when the tongue 4 tries to rotate to the sheet S side, the inner surface of the webbing insertion hole 47a constitutes the posture holding portion 40, and the rotation of the tongue 4 can be suppressed, thereby improving the operability. be able to. As described above, the posture holding unit 40 may be configured by the webbing insertion part (the protrusion 47 and the webbing insertion hole 47a) formed at a position higher than the connection part 42.

  The present invention is not limited to the above-described embodiment, and can be applied to a seat other than the passenger seat (for example, a driver seat, a rear seat, etc.), and the like without departing from the spirit of the present invention. Of course, various modifications are possible.

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus 2 ... Webbing 3 ... Seat belt retractor 4 ... Tongue 4a ... Main-body part 4b ... Cover member 4c ... Opening part 5 ... 1st guide anchor 6 ... Buckle 7 ... 2nd guide anchor 21 ... Shoulder part 22 ... Wrap Part 22a ... first wrap part 22b ... second wrap part 40 ... posture holding part 41 ... opening part 42 ... connection part 42a ... connection opening part 43 ... engagement part 43a ... engagement opening part 44 ... core material 45 ... resin Portions 46, 47 ... projections 46a, 47a ... webbing insertion holes

Claims (7)

A seat belt device for restraining the occupant to a seat having a seat part on which the occupant sits and a backrest part located on the back of the occupant,
A webbing that restrains the occupant; a seat belt retractor that winds the webbing; a tongue that is connected to a tip of the webbing; a first guide anchor that is provided on a vehicle body side and guides the webbing; A buckle disposed on a side surface and engaged with a front end portion of the tongue; and a second guide anchor disposed on a side surface of the seat opposite to the buckle,
The webbing is slidably guided from the seat belt retractor to the first guide anchor, and is slidably inserted into an opening formed in the tongue, and then slidable to the second guide anchor. Guided, again guided by the tongue and connected to the rear end side from the opening,
The tongue has a posture holding portion that suppresses rotation by contacting the surface of the webbing when tension is applied in a winding direction of the webbing when the seat belt is not attached.
A seat belt device characterized by that.   The webbing includes a shoulder portion spanned between the first guide anchor and the tongue, and a lap portion spanned between the tongue and the second guide anchor, and the wrap The first wrap portion spanned between the opening of the tongue and the second guide anchor, and the second wrap spanned between the second guide anchor and the connecting portion of the tongue. The first wrap portion is disposed on the lower side and the second wrap portion is disposed on the upper side when the seat belt is worn. Seat belt device.   When the webbing is wound up with the seat belt attached, the tongue and the second guide are movable in the direction in which the first wrap portion and the second wrap portion are pulled into the seat belt retractor. The seat belt device according to claim 2, wherein the seat belt device is guided by an anchor.   The seat belt device according to claim 1, wherein the second guide anchor has the same configuration as the first guide anchor.   2. The seat belt device according to claim 1, wherein the tongue is configured such that the posture holding portion is disposed closer to the seat than the webbing in a state in which the seat belt is not attached.   The tongue includes a main body portion including the opening, a connection portion with the webbing, and an engagement portion with the buckle, and a cover member connected to the main body portion, and the cover member is in the posture. The seat belt device according to claim 5, wherein the seat belt device constitutes a holding portion. 6. The seat belt device according to claim 5, wherein the posture holding portion is configured by a webbing insertion portion formed in a position parallel to or higher than the connecting portion of the tongue.