JP5473660B2 - Seat belt guide structure - Google Patents

Description

  The present invention relates to a seat belt guide structure that defines a shoulder position of a seat belt, and more particularly to a seat belt guide structure suitable for use in a center portion of a three-seat seat.

  As a seat belt layout of a three-seat seat that is widely used for rear seats (particularly second seats) of automobiles, for example, a seat belt (center seat belt) for a center part seater is provided on either the left or right side wall of the vehicle body. What is pulled out from a retractor is known (for example, Unexamined-Japanese-Patent No. 2009-258552 etc.).

  In such a seat belt layout, since the center seat belt is pulled out from the retractor and is attached to the seat at a greatly different angle, the seat is usually provided at the upper end of the seat back at a position corresponding to the shoulder portion of the center portion. The center seat belt is pulled out to the seating surface side of the seat through the belt guide, and the center seated seater is mounted so as to be restrained under the insertion of the tongue to the buckle at the corresponding location.

JP 2009-255852 A

  By the way, in the event of an emergency such as a forward collision, when the seat belt is pulled forward by a load from the seated person, the seat belt tries to be linearly tensioned between the retractor and the seated person. The frame is required to have rigidity sufficient to withstand the load at that time. In order to withstand this emergency load, in Japanese Patent Application Laid-Open No. 2009-255852, the seat belt guide is detached from the position corresponding to the seat back shoulder by fixing the seat belt guide as a metal frame to the seat back frame by welding. In addition, the seat back frame is provided with a load transmission member, and the load acting on the seat belt guide is allowed to escape from the load transmission member to the vehicle body, thereby preventing excessive deformation of the seat back frame.

  However, in such a configuration, since the seat belt guide, the seat back frame, and the load transmitting member are required to have appropriate rigidity, there is a possibility that the weight of the entire seat back is increased.

  The present invention provides a seat belt that can prevent the seat belt from detaching from the position corresponding to the seat back shoulder due to an excessive load applied to the seat belt and excessive deformation of the seat back frame without increasing the weight. The purpose is to provide a guide structure.

  For the above purpose, according to the seat belt guide structure of the present invention according to claim 1, the pair of left and right seat belt guides that are inserted and held through the seat belt are inserted into the insertion holes of the brackets in the seat back. The leg part extends downward from the lower end of which the retractor placement side leg part is fixedly connected to the bracket so that it cannot be detached, and the other side leg part is loosely placed in the large-diameter insertion hole of the bracket. The free leg is defined as a free leg, and the free leg has a jaw portion engaged with the periphery of the large-diameter insertion hole of the bracket under the bending deformation of the fixed leg in the direction of the retractor arrangement with respect to the bracket. Is formed.

According to the second aspect of the present invention, the holding pipe into which the fixed leg of the seat belt guide is inserted has a penetrating portion in which the upper extending end and the lower extending end are respectively extended to the outside by appropriate lengths. The fixing leg of the seat belt guide is connected to the holding pipe so as not to be detached by the locking means fixed to the retractor arrangement side insertion hole of the bracket.
According to the third aspect of the present invention, the free leg of the seat belt guide extends downward via the lower end large diameter portion of the seat belt guide, and when the fixed leg is connected to the bracket, the seat belt guide The large-diameter portion at the lower end is inserted into the large-diameter insertion hole of the bracket.
Furthermore, according to the present invention of claim 4, the lower end large diameter portion of the seat belt guide is formed with ribs extending in the axial direction on its peripheral surface.

  In the first aspect of the present invention, the free leg of the seat belt guide is loosely inserted into the large-diameter insertion hole of the bracket, so that the tilt of the seat belt guide in the direction of the retractor arrangement side accompanying the bending deformation of the fixed leg is guaranteed. In addition, by providing the free leg with a jaw that can be engaged with the periphery of the large-diameter insertion hole, the free leg is prevented from coming off from the large-diameter insertion hole when the free leg is tilted. That is, the shock absorption due to the tilt of the seat belt guide sufficiently reduces the input load from the seat belt, so excessive deformation of the seat back frame without adding a load transmission member or strengthening the rigidity of the seat back frame Seat belt from the position corresponding to the shoulder of the seat back by preventing the free leg from coming out of the large diameter insertion hole under the engagement of the jaw part with the periphery of the large diameter insertion hole. Can be reliably prevented. Therefore, according to the first aspect of the present invention, it is possible to prevent the seat belt from being detached from the position corresponding to the seat back shoulder and excessive deformation of the seat back frame without increasing the weight.

Further, in the present invention according to claim 2, the holding pipe is fixed to the retractor arrangement side insertion hole of the bracket in a state where the holding pipe penetrates in the vertical direction, so that the upper extension end secures the space between the seat belt guide and the bracket. To function as a spacer. As a result, the bending deformation of the fixed leg can be obtained smoothly and the bending deformation portion can be specified at the upper end edge of the holding pipe, so that the jaw part can be more reliably engaged with the periphery of the large-diameter insertion hole in the free leg. Be improved.
In the present invention according to claim 3, when the fixed leg is connected to the bracket, the lower end large diameter portion of the seat belt guide is inserted into the large diameter insertion hole of the bracket. Backlash can be reliably prevented.
Further, in the present invention according to claim 4, since the lower end large-diameter portion of the seat belt guide is formed with a rib extending in the axial direction on its peripheral surface, the fitting to the large-diameter insertion hole of the bracket is possible. Certainty is further improved.

(A) (B) is each schematic front view of the seatbelt guide structure of this invention before the effect | action of an excessive load, and after the effect | action. It is a schematic perspective view of a rear seat having a seat belt guide. It is a schematic exploded perspective view of a seat belt guide structure.

  Of the pair of left and right legs of the seat belt guide, the retractor placement side leg can be fixedly connected to the bracket so that it cannot be detached, and the other side leg can be freely inserted into the large-diameter insertion hole of the bracket. Each leg is defined as a leg, and the free leg is formed with a jaw portion engaged with the periphery of the large-diameter insertion hole of the bracket under the bending deformation of the fixed leg in the direction of the retractor arrangement with respect to the bracket. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B are schematic front views of the seat belt guide structure of the present invention before and after the action of an excessive load, FIG. 2 is a schematic perspective view of a rear seat having a seat belt guide, and FIG. The schematic exploded perspective view of a seatbelt guide structure is shown, respectively. As shown in these drawings, in the seat belt guide structure 10 of the present invention, the seat belt guide 14 for inserting and holding the seat belt 12 is connected to a bracket 18 fixed to the seat back frame 16 under the condition of the seat. It is provided at the upper end of the back 20.

  As can be seen from FIG. 2, the seat belt guide 14 is a seat belt for a center part seater among seating parts (left and right seating parts 12L and 12R and a center seating part 12C) of a three-seat seat. In the case where a retractor (not shown), which is a seat belt retractor, is provided on one of the left and right side walls of the vehicle body, the side on which the retractor is provided is defined. The seat belt guide is arranged so that the shoulder position of the seat can be defined. Here, the vehicle body side wall (L side) on the left seating portion 12L side viewed from the seated person will be described as the retractor arrangement side.

  Note that the seat belt 12 pulled out from the retractor behind the seat back to the seat seating surface side can normally restrain at least the chest of the seated person by inserting a tongue at the tip of the seat belt 12 into the corresponding buckle on the seat side. Although the configuration of the seat belt of this type is known as described in Japanese Patent Application Laid-Open No. 2009-255852 and the like, a detailed description of the basic configuration of the seat belt is omitted here.

  As can be seen from FIG. 1A and FIG. 3, the seat belt guide 14 is formed, for example, from a synthetic resin material into a closed cross-sectional shape that allows the seat belt to be inserted, for example, a closed cross-sectional shape of a substantially triangular front surface. A pair of left and right leg portions 15L and 15R inserted through the insertion holes 19L and 19R of the bracket 18 extend downward from the lower ends thereof. The pair of left and right leg portions (leg portions of the seat belt guide) 15L and 15R are formed by bending a single bar, and the seat belt guide 14 is formed by integral molding with the bar.

  For example, the bracket 18 is formed in a substantially U-shaped cross section having upper and lower walls 18a and 18b, and is fixed to the seat back frame 16 (specifically, the upper end pipe of the seat back frame) by welding or the like so as to be sandwiched between the upper and lower walls. Has been. And the insertion holes 19L (retractor arrangement side insertion holes, 19L-a, 19L-b) aligned on the retractor arrangement side (L side) and the other side (R side) respectively on the upper and lower walls 18a, 18b of this bracket, 19R (19R-a, 19R-b) are provided, and the seat belt guide 14 is attached to the bracket 18 with the legs 15L (retractor arrangement side legs) and 15R inserted into the insertion holes on the respective sides. Arranged.

  Here, in the present invention, of the leg portions 15L and 15R of the seat belt guide, the retractor-placement-side leg portion 15L is fixedly connected to the bracket 18 so as not to be detached, and the other-side leg portion 15R. Are respectively defined as free legs that are loosely arranged in the corresponding insertion holes 19R of the bracket. In this embodiment, the holding pipe 22 into which the fixing leg (retractor arrangement side leg) 15L of the seat belt guide can be inserted extends the upper extension end 22a and the lower extension end 22b outward of the upper and lower walls, respectively. In a state where the seat belt guide is pulled out, it passes through the retractor arrangement side insertion hole 19L (19L-a, 19L-b) of the bracket and is fixed by welding or the like. The fixed leg 15L is connected to the bracket 18 so as not to be detached.

  The upper extending end 22a of the holding pipe 22 functions as, for example, a positioning spacer that defines an interval between the bracket and the seat belt guide. By maintaining this interval, the seat is interposed between the bracket and the seat belt guide. It is possible to secure a space for arranging the pads. Then, as a locking means 24 for locking and connecting the fixed leg 15L of the seat belt guide to the holding pipe 22, for example, a kerf 26 formed in the downwardly extending end 22b of the holding pipe 22 under the biasing force. A clip-like spring lock that is sandwiched can be exemplified, and this spring lock allows insertion of the distal end of the fixed leg by expansion against the urging force, and is fixed by engagement with alignment with the cut groove 28 of the fixed leg. It is configured to connect and hold the legs so that they cannot be detached.

  As can be seen from FIGS. 1A and 3, the seat belt guide 14 is formed integrally with the lower end large diameter portion 14a on the free leg 15R side of the seat belt guide, and the free leg 15R is The lower end extends through the large-diameter portion. And the insertion hole 19R (19R-a, 19R-b) of a bracket is formed in the large diameter which can insert the lower end large diameter part 14a of this seatbelt guide.

  In such a configuration, the seat belt guide 14 is mounted on the bracket when the fixed leg 15L and the free leg 15R are inserted into the holding pipe 22 and the insertion holes (large diameter insertion holes) 19R (19R-a, 19R-b). 18, and by extension, mounted on the seat back 20. The seat belt guide 14 is inserted with the insertion of the lower end large diameter portion 14a into the large diameter insertion hole 19R, that is, the upper wall insertion hole 19R-a. In addition to the prevention of detachment by the locking means 24, the rattling is also reliably prevented.

  In this embodiment, a spring lock is illustrated as the locking means 24 for connecting the fixed leg 15L to the holding pipe 22, but the fixed leg 15L of the seat belt guide is detached from the holding pipe 22 and eventually the bracket 18. Since it is sufficient if it can be connected impossible, it is not limited to this, You may use another member as a latching means. However, if such a spring lock is used as the locking means 24, the fixing leg 15L can be connected to the bracket 18 only by insertion from the outside of the upper end of the seat back, so that the seat belt guide 14 is attached to the seat back 20. Work can be done easily.

  By the way, in the event of an emergency such as a collision, when the seat belt 12 is pulled forward under the forward movement of the upper body of the seated person, the seat belt tends to be tensioned linearly between the seated person and the retractor. An excessive load F acts in the retractor arrangement direction (L direction) on the seat belt guide 14 that holds the seat belt (see FIG. 1A). In this invention, only the fixed leg 15L on the retractor arrangement side of the seat belt guide is fixedly connected to the bracket 18, and the free leg 15R on the other side is a large-diameter insertion hole 19R (19R-a 19R-b), the seat belt guide 14 is tilted toward the retractor arrangement side with bending deformation of the fixed leg 15L with the upper end of the holding pipe 22 as a fulcrum, for example. Thus, the other free leg 15R moves in a direction to escape from the large-diameter insertion hole 19R (19R-a, 19R-b).

  Therefore, in the present invention, in order to prevent the free leg 15R from coming off from the large-diameter insertion hole 19R (19R-a, 19R-b) of the bracket, the large-diameter insertion hole under the bending deformation of the fixed leg 15L, In particular, a jaw 30 that can be engaged with the periphery of the large-diameter insertion hole 19R-b of the lower wall 18b of the bracket is provided at the lower end of the free leg. In addition, the jaw part 30 is formed as a lower end step part made of, for example, a kerf.

  As described above, in the present invention, the free leg 15R of the seat belt guide is loosely disposed in the large-diameter insertion hole 19R (19R-a, 19R-b) of the bracket, thereby causing bending deformation of the fixed leg 15L. By providing the free leg with a jaw 30 that ensures the tilting of the seat belt guide 14 in the direction of the retractor arrangement and can be engaged with the periphery of the large-diameter insertion hole, the free leg from the large-diameter insertion hole is tilted. The omission is blocked. That is, since the input load from the seat belt 12 is sufficiently reduced by the impact absorption due to the tilt of the seat belt guide 14, the seat back frame 16 can be removed without adding a load transmission member or strengthening the rigidity of the seat back frame. Excessive deformation can be reliably prevented, and by preventing the free leg 15R from coming out of the large diameter insertion hole under the engagement of the jaw 30 with the large diameter insertion hole peripheral edge 19R (19R-b), The detachment of the seat belt from the position corresponding to the shoulder portion of the seat back 20 can be reliably prevented. Therefore, according to the present invention, it is possible to prevent the separation of the seat belt 12 from the position corresponding to the seat back shoulder and excessive deformation of the seat back frame 16 without increasing the weight.

  Here, in the present invention, since the holding pipe 22 is penetrated in the vertical direction, the holding pipe 22 is fixed to the retractor arrangement side insertion hole 19L (19L-a, 19L-b) of the bracket. It functions as a spacer for securing a gap between the belt guide 14 and the bracket 18. Accordingly, the bending deformation of the fixed leg 15L can be obtained smoothly, and the bending deformation portion can be specified at the upper end edge of the holding pipe 22. Therefore, the jaw with respect to the large-diameter insertion hole peripheral edge 19R (19R-b) at the free leg 15R. The certainty of engagement of the part 30 is further improved.

  In the present invention, when the fixed leg 15L is connected to the bracket 18, the lower end large diameter portion 14a of the seat belt guide is inserted into the large diameter insertion hole 19R (19R-a) of the bracket, so that the free leg 15R side The backlash of the seat belt guide 14 can be reliably prevented. In addition, in this structure, it is preferable to provide the rib 32 extended in an axial direction in the surrounding surface of this lower end large diameter part 14a. According to such a configuration, even if an error occurs in the diameter of the large-diameter insertion hole 19R (19R-a) or the diameter of the lower end large-diameter portion 14a, the rib 32 can absorb the error. Can be secured easily.

  By the way, the lower end large diameter portion 14a of the seat belt guide is larger in diameter than the free leg 15R. Therefore, if the seat belt guide 14 is erroneously reversed left and right and inserted into the bracket 18, the upper end of the holding pipe 22 is increased. The insertion length is regulated by the engagement of the lower large-diameter portion with respect to. The holding pipe locking means 24 is provided at the lower extension end 22b of the holding pipe that extends downward from the bracket 18 and restricts the insertion length of the free leg 15R by the lower end large diameter portion 14a. Therefore, the engagement between the locking means and the jaw portion 30 of the free leg does not occur. Therefore, by extending the free leg from the large diameter portion at the lower end, the seat belt guide 14 can be securely attached to the bracket 18 in the left-right direction. Can be prevented.

  In this embodiment, the bracket 18 is embodied as a substantially hollow shape having a substantially U-shaped cross section. However, the present invention is not limited to this, and the bracket may be formed from a solid block-shaped body.

  The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention. All modifications, alterations and the like within the technical scope of the present invention are included in the present invention. Needless to say.

  In general, the seat belt guide for the seat portion of the center part of the second seat is the target, but if it has a retractor on the left and right side walls of the rear part of the seat, the seat belt guide for the left and right seating parts, The present invention can also be applied to a seat belt guide for each seating part of the third seat or the front seat.

10 Seat belt guide structure 12 Seat belt 14 Seat belt guide 15 (15L, 15R) Leg (fixed leg, free leg)
18 Bracket 22 Holding pipe 24 Locking means 30 Jaw portion 32 Rib

Claims (4)

The seat belt guide structure is provided at the upper end of the seat back and defines the shoulder position on the seat by inserting the seat belt from the retractor disposed on either of the left and right side walls of the vehicle body,
A seat belt guide that inserts and holds the seat belt extends downward from the lower end of a pair of left and right legs that are inserted into the insertion holes of the bracket in the seat back. It is defined as a fixed leg that is connected so as not to be detached, and a free leg whose other side leg is loosely placed in the large-diameter insertion hole of the bracket. A seat belt guide structure formed with a jaw portion engaged with a peripheral edge of a large-diameter insertion hole of a bracket under bending deformation of a fixed leg. The holding pipe into which the seat belt guide fixed leg is inserted is fixed to the retractor insertion side insertion hole of the bracket under the penetrating extension of the upper extension end and the lower extension end to each outer side. 2. The seat belt guide structure according to claim 1, wherein a fixing leg of the seat belt guide is detachably connected to the holding pipe by a locking means arranged at the lower extension end. The free leg of the seat belt guide is extended downward through the lower end large diameter part of the seat belt guide, and when the fixed leg is connected to the bracket, the lower end large diameter part of the seat belt guide becomes the large diameter insertion hole of the bracket. The seat belt guide structure according to claim 1 or 2, wherein the seat belt guide structure is inserted. 4. The seat belt guide structure according to claim 3, wherein the large diameter portion of the lower end of the seat belt guide has a rib extending in the axial direction on its peripheral surface.

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