Vehicle seat webbing guide structure

Abstract

To provide a vehicular seat webbing guide structure that can easily stabilize a force limiter load.SOLUTION: A vehicular seat webbing guide structure is equipped with a seat belt webbing 14, a seat frame 20, and a guide member 31 for guiding the webbing 14. The guide member 31 is equipped with a top wall 32 extending in a fore-and-aft direction L, a front wall 33 extending downward from a front end part of the top wall portion 32, a side wall extending downward from an end portion in a width direction on the top wall 32, a rear wall 37 extending downward from a rear end part 32a of the top wall 32, and an insertion port 32c in which the webbing 14 is inserted. The rear wall 37 is provided with a first hooking portion 40. The webbing 14 extends from the lower side toward the rear end part 32a of the top wall 32 and extends forward from the rear end part 32a. The seat frame 20 is provided with a second hooking portion 42 that hooks to the first hooking portion 40 to regulate upward movement in a vertical direction Z of the first hooking portion 40.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a guide structure for a webbing of a vehicle seat. [Background technology]

[0002] Patent Document 1 discloses a vehicle seat provided with a resin guide member that guides the webbing of a seat belt. The guide member is fixed to an upper portion of a seat back frame of a vehicle seat so as to cover the upper portion. The guide member is formed in a generally quadrangular pyramid shape and has a front wall, a rear wall, side walls connecting the ends of the front wall and the rear wall, and a top wall connecting the upper portions of the front wall, rear wall, and side walls.

[0003] A passage opening extending in the vehicle width direction is provided in the rear portion of the top wall to prevent the webbing from being inverted. The webbing worn by an occupant sitting in the vehicle seat is inserted through the passage opening. The webbing extends from the bottom to the top, and is then inserted through the passage opening and extends forward. By inserting the webbing through the passage opening, the webbing is prevented from being inverted upside down.

[0004] The front wall and the side walls are provided with fixing holes, and the guide member is fixed to the seat back frame by inserting screws into the fixing holes. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-64715 Summary of the Invention [Problem to be solved by the invention]

[0006] When the vehicle decelerates and the occupant's body moves forward, a load acts on the webbing toward the front. As a result, the webbing presses the front edge of the passage opening toward the front. As a result, the guide member elastically deforms. This causes the rear portion of the guide member to lift upward, and the position of the webbing also changes upward. This change in the position of the webbing makes the force limiter load, which is the load that the webbing applies to the occupant, unstable. [Means for solving the problem]

[0007] Various aspects of a guide structure for a webbing of a vehicle seat for solving the above problems will be described. [Aspect 1] A webbing guide structure for a vehicle seat comprising a seat belt webbing, a seat frame constituting a seat back, and a resin guide member attached to an upper end portion of the seat frame and guiding the webbing, wherein the guide member comprises a top wall extending in the front-to-rear direction of the vehicle seat, a front wall extending from a front end portion of the top wall to the lower side in the up-down direction of the vehicle seat, side walls of the top wall extending downward from ends of the vehicle seat in the width direction to the lower side, a rear wall extending downward from a rear end portion of the top wall, and an insertion opening through which the webbing is inserted, wherein a first hooking portion is provided on the rear wall, and the webbing extends from the lower side toward the rear end portion of the top wall and extends forward from the rear end portion in the front-to-rear direction, and the seat frame is provided with a second hooking portion that hooks onto the first hooking portion to restrict the first hooking portion from moving upward in the up-down direction.

[0008] According to the above configuration, when a load acts on the webbing in the forward direction, the load is transmitted from the webbing to the rear end portion of the top wall in the forward direction. Accordingly, the load is transmitted upward to the rear wall. Here, the first hooking portion of the rear wall of the guide member hooks onto the second hooking portion of the seat frame, restricting upward movement. This prevents the guide member from elastically deforming and changing the position of the webbing. This makes it easier to stabilize the force limiter load.

[0009] [Aspect 2] The guide member has a fastening portion that fastens the guide member to the seat frame, and the fastening portion is provided on at least one of the front wall and the side wall among the rear wall, the front wall, and the side wall. This is a guide structure for a webbing of a vehicle seat described in [Aspect 1].

[0010] When a fastening portion is provided on the rear wall of the guide member and the rear wall is fastened to the seat frame, the following problem occurs: The fastening portion on the rear wall is covered from above by the webbing, making it difficult for an operator to check the position of the fastening portion when attaching the guide member to the seat frame.

[0011] In this regard, with the above-described configuration, the fastening portion is not covered by the webbing, making it easier to check the position of the fastening portion during the fastening operation. [Aspect 3] A guide structure for a webbing of a vehicle seat as described in [Aspect 1] or [Aspect 2], in which the first hooking portion is a protruding portion that protrudes rearward in the fore-and-aft direction, and the second hooking portion is hooked onto the protruding portion by being located above the protruding portion.

[0012] For example, if the first hooking portion is a recess and the second hooking portion is a protrusion that hooks onto the recess, it is preferable to make the recess deeper to prevent the recess and protrusion from being disengaged. However, making the recess deeper requires making the rear wall thicker, which results in a larger guide member.

[0013] In this regard, according to the above configuration, the first hooking portion can be realized by a simple configuration of providing a protrusion, so the guide member does not become large. [Aspect 4] The seat frame is provided with a hole that opens to the upper side and into which the rear wall is inserted, and the second hooking portion is the edge portion on the rear side of the hole.This is a guide structure for a webbing for a vehicle seat as described in [Aspect 3].

[0014] According to the above configuration, when attaching the guide member to the seat frame, the first hooking portion can be hooked to the second hooking portion by the simple operation of passing the protrusion through the hole. Also, by providing a hole in the seat frame, the second hooking portion can be easily realized.

[0015] [Aspect 5] A rib is provided on the surface of the rear wall facing the seat frame, and the seat frame is provided with a contact surface that faces the rib in the fore-and-aft direction and comes into contact with the rib. This is a guide structure for a webbing of a vehicle seat described in any one of [Aspect 1] to [Aspect 4].

[0016] With this configuration, when a load is applied from the webbing to the front of the guide member, the rib of the guide member comes into contact with the contact surface. The portion of the guide member where the rib is provided receives the force from the contact surface, making the guide member less susceptible to elastic deformation. This further stabilizes the force limiter load. [Effects of the Invention]

[0017] According to the present invention, the force limiter load of the seat belt is more likely to be stabilized. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view of a vehicle seat according to one embodiment. [Figure 2] FIG. 2 is a perspective view of the guide mechanism according to the embodiment attached to a seat frame. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a perspective view of the seat frame and the guide member according to the embodiment, as viewed from the front side. [Figure 5] FIG. 5 is a perspective view of the guide member according to the embodiment, seen from below. [Figure 6] FIG. 6 is an exploded perspective view of the seat frame and the guide member according to the embodiment, as viewed from the outside. [Figure 7] FIG. 7 is a perspective view of the seat frame and the guide member according to the embodiment, as viewed from the outside. [Figure 8] FIG. 8 is a cross-sectional view taken along line 3-3 in FIG. 2 according to a modified example. [Figure 9] FIG. 9 is a cross-sectional view taken along line 3-3 in FIG. 2 according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of a webbing guide structure for a vehicle seat will be described below with reference to Figures 1 to 9. In the following, the front-to-rear direction of the vehicle seat 10 will be referred to as the front-to-rear direction L, the up-to-down direction as the up-to-down direction Z, and the width direction as the width direction W, and the front-to-rear direction L is the same as the front-to-rear direction of the vehicle. In addition, in the width direction W, the direction away from the center of the vehicle seat 10 will be referred to as the outward side, and the direction towards the center will be referred to as the inward side.

[0020] As shown in FIG. 1, a vehicle seat 10 includes a seat cushion 11, a seat back 12 provided at the rear end of the seat cushion 11, and a headrest 13 provided at the upper end of the seat back 12.

[0021] The vehicle seat 10 is also provided with a seat belt webbing 14. A tongue 15 is attached to the webbing 14. A guide mechanism 30 that guides the webbing 14 is provided at the upper end of the seat back 12, at a position away from the center of the seat back 12 in the width direction W. The seat cushion 11 is also provided with a buckle 16 to which the tongue 15 is attached and detached. The buckle 16 is located at the end of the seat cushion 11 on the opposite side of the guide mechanism 30 with respect to the center of the width direction W.

[0022] <Seat back 12, seat frame 20> 2, a seat frame 20 is provided inside the seat back 12. A cushioning material (not shown) is attached to the seat frame 20.

[0023] At the upper end portion of the seat frame 20, at a position away from the center in the width direction W of the seat frame 20, a first attachment portion 21 to which the guide mechanism 30 is attached is provided. As shown in Figures 3 to 7, the first mounting portion 21 includes a front plate 23 and a rear plate 24 that face each other in the front-to-rear direction L and extend in the up-down direction Z, and an outer plate 25 and an inner plate 26 that face each other in the width direction W and extend in the up-down direction Z.

[0024] 3, the upper end of the front plate 23 is bent rearward. The front plate 23 is also provided with a first mounting hole 23a. The rear panel 24 has a bent portion 24a that extends from the bottom to the top and bends forward, and an inclined portion 24b that extends upward from the front end of the bent portion 24a while sloping forward. The inclined portion 24b is bent forward at its upper end. That is, the rear panel 24 has a step formed by the bent portion 24a and the inclined portion 24b. The rear surface of the inclined portion 24b is a contact surface 24c.

[0025] 3 and 6, a hole 24d that opens upward is provided at the connection between the bent portion 24a and the inclined portion 24b in the first attachment portion 21. In this embodiment, a rear edge 43 of the hole 24d is the second hook portion 42 described in the "Summary of the Invention."

[0026] 6 and 7, the outer plate 25 extends forward from the outer end of the rear plate 24 and is joined to the front plate 23. The outer plate 25 is provided with a second mounting hole 25a. The inner plate 26 extends forward from the inner end of the rear plate 24 and is joined to the front plate 23.

[0027] As shown in FIGS. 2 and 3, a path cover 27 through which the webbing 14 is passed is attached to the rear plate 24. As shown in FIGS. 2 and 4, the seat frame 20 is provided on its front side with a second mounting portion 22 to which the guide mechanism 30 is attached.

[0028] <Guide mechanism 30> 2 and 3, the guide mechanism 30 includes a guide member 31, an attachment member 38, and a design member 39. The guide member 31, the attachment member 38, and the design member 39 are made of resin.

[0029] As shown in FIGS. 3 to 7, the guide member 31 includes a top wall 32, a front wall 33, side walls 34, and a rear wall 37. 3 and 4, the top wall 32 extends in the front-to-rear direction L. A restricting portion 32b that protrudes upward and extends in the width direction W is provided at a rear end portion 32a of the top wall 32. The restricting portion 32b has a first insertion opening 32c that penetrates in the front-to-rear direction L and through which the webbing 14 is inserted.

[0030] As shown in FIGS. 3 to 5, the front wall 33 extends downward from the front end portion of the top wall 32. The front wall 33 is provided with a screw as a first fastening portion 33a that is fastened to the seat frame 20. The front wall 33 is also provided with a first fastening hole 33b into which the first fastening portion 33a is inserted. The first fastening hole 33b is located forward of the first mounting hole 23a in the front plate 23 of the seat frame 20. The guide member 31 is fastened to the seat frame 20 by inserting the first fastening portion 33a into the first fastening hole 33b in the front wall 33 and the first mounting hole 23a in the front plate 23.

[0031] As shown in FIGS. 4 to 7, the side wall 34 includes an outer wall 35 and an inner wall 36. The outer wall 35 extends downward from the outer end of the top wall 32. The outer wall 35 is provided with a screw as a second fastening portion 35a that is fastened to the seat frame 20. The outer wall 35 is also provided with a second fastening hole 35b into which the second fastening portion 35a is inserted. The second fastening hole 35b is positioned outside the second mounting hole 25a in the outer panel 25 of the seat frame 20. The guide member 31 is fastened to the seat frame 20 by inserting the second fastening portion 35a into the second fastening hole 35b in the outer wall 35 and the second mounting hole 25a in the outer panel 25.

[0032] Additionally, an inner wall 36 extends downwardly from the inner end of the top wall 32 . 3, the rear wall 37 extends downward from the rear end portion 32a of the top wall 32. A protruding portion 41 serving as a first hook portion 40 protruding rearward is provided at the lower end of the rear wall 37.

[0033] As shown in FIGS. 3 and 7, the lower end of the rear wall 37 is inserted into the hole 24d of the seat frame 20. The second hooking portion 42 of the seat frame 20 is positioned above the first hooking portion 40 of the guide member 31 and is thereby hooked onto the first hooking portion 40 .

[0034] 3 and 5, a rib 50 is provided on the surface of the rear wall 37 that faces the inclined portion 24b of the seat frame 20. The rib 50 is formed of a plurality of protruding pieces that are aligned in the width direction W. The rib 50 faces and contacts the contact surface 24c of the seat frame 20.

[0035] 2 and 3, the mounting member 38 is attached to the restricting portion 32b of the guide member 31 and the second mounting portion 22 of the seat frame 20. A second insertion opening 38a through which the webbing 14 is inserted is provided on the front side of the mounting member 38.

[0036] The design element 39 is attached to the front side of the mounting element 38. A third insertion opening 39a through which the webbing 14 is inserted is provided on the front side of the design element 39. The third insertion opening 39a of the design element 39 is located in front of the second insertion opening 38a of the mounting element 38.

[0037] As shown in FIG. 1, the design member 39 is disposed on the surface of the seat back 12. <Webbing 14> 3, the webbing 14 passes through the inside of the path cover 27, extends from the lower side toward the rear end portion 32a of the top wall 32, and is inserted from the rear end portion 32a through the first insertion opening 32c of the restricting portion 32b and extends forward. The webbing 14 is then inserted through the second insertion opening 38a of the mounting member 38 and the third insertion opening 39a of the design member 39, and extends forward of the seat back 12.

[0038] The first insertion opening 32c in this embodiment corresponds to the insertion opening described in "SUMMARY OF THE INVENTION." The first fastening portion 33a and the second fastening portion 35a in this embodiment correspond to the fastening portions described in "SUMMARY OF THE INVENTION."

[0039] The operation of this embodiment will be described. When a load acts on the webbing 14 in the front direction, the load is transmitted from the webbing 14 to the rear end portion 32a of the top wall 32 of the guide member 31 in the front direction.

[0040] Here, the first hooking portion 40 of the rear wall 37 of the guide member 31 is hooked to the second hooking portion 42 of the seat frame 20, thereby preventing the rear wall 37 from moving upward. Therefore, the guide member 31 is prevented from elastically deforming and changing the position of the webbing 14.

[0041] The effects of this embodiment will be described. (1) When the first hooking portion 40 of the rear wall 37 of the guide member 31 and the second hooking portion 42 of the seat frame 20 are hooked together, the above-described effect is achieved, making it easier to stabilize the force limiter load.

[0042] (2) The first fastening portion 33a is provided on the front wall 33, and the second fastening portion 35a is provided on the outer wall 35. According to this configuration, the first fastening portion 33a and the second fastening portion 35a are not covered by the webbing 14. Therefore, it is easy to check the positions of the first fastening portion 33a and the second fastening portion 35a during the fastening operation.

[0043] Furthermore, compared to when fastening portions are provided on the inner wall 36 of the guide member 31, the front wall 33 and the outer wall 35 extend along the shape of the seat frame 20, making it easier to fasten the guide member 31.

[0044] (3) The first hook portion 40 is the protruding portion 41, and the second hook portion 42 is hooked onto the protruding portion 41 by being positioned above the protruding portion 41. According to this configuration, the first hooking portion 40 can be realized by the simple configuration of providing the protrusion 41.

[0045] (4) The seat frame 20 is provided with a hole 24d into which the rear wall 37 of the guide member 31 is inserted, and the second hook portion 42 is the rear edge 43 of the hole 24d. According to this configuration, when attaching the guide member 31 to the seat frame 20, the first hooking portion 40 can be hooked to the second hooking portion 42 by the simple operation of passing the protrusion 41 through the hole 24d. Also, by providing the hole 24d in the seat frame 20, the second hooking portion 42 can be easily realized.

[0046] (5) The rib 50 of the rear wall 37 is in contact with the contact surface 24c of the seat frame 20 while facing the contact surface 24c in the front-rear direction L. According to this configuration, when a load acts on the guide member 31 from the webbing 14 toward the front, the rib 50 comes into contact with the contact surface 24c. Then, the portion of the guide member 31 where the rib 50 is provided receives the force from the contact surface 24c, making it difficult for the guide member 31 to elastically deform. Therefore, the force limiter load is further stabilized.

[0047] In this embodiment, "hooked" means a state in which two members are hooked together and do not move when a load is applied to them, whereas "fastened" means a state in which two members are fixed and do not move by a force acting on them from a member other than the two members, such as a screw, i.e., a state in which both members are fixed and do not move regardless of the presence or absence of a load.

[0048] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0049] The rib 50 may be omitted. The second hook portion 42 is not limited to the rear edge 43 of the hole 24d. For example, as shown in Fig. 8, the hole 24d may be omitted, and the second hook portion 42 may be formed in a hook shape that protrudes from the rear surface of the seat frame 20 toward the upper side of the protrusion 41 serving as the first hook portion 40.

[0050] The first hook portion 40 is not limited to the protruding portion 41 that protrudes rearward. For example, as shown in Fig. 9, the second hook portion 42 may be a protruding portion that protrudes rearward from the inclined portion 24b, and the first hook portion 40 may be a recessed portion that hooks onto the protruding portion.

[0051] The fastening portion may be provided on the inner wall 36 of the guide member 31. Alternatively, the fastening portion may be provided on either the front wall 33 or the outer wall 35. [Explanation of symbols]

[0052] 10...Vehicle seat 11...Seat cushion 12...Seat back 13...Headrest 14...Webbing 15...Tongue 16...Buckle 20...Seat frame 21...First mounting part 22...Second mounting part 23...Front panel 23a...First mounting hole 24…Rear plate 24a...Bending part 24b…Slope part 24c…Contact surface 24d…hole 25...Outer plate 25a...Second mounting hole 26...Inner plate 27... Pass Cover 30...Guide mechanism 31...Guide member 32...Top wall 32a...Rear end part 32b…Regulatory Department 32c...First insertion port (insertion port) 33...Front wall 33a...First fastening part (fastening part) 33b…First fastening hole 34…Side wall 35...Outside wall 35a...Second fastening part (fastening part) 35b…Second fastening hole 36...Inner wall 37…Back wall 38...Mounting member 38a...Second insertion port 39...Design components 39a...Third insertion port 40...First hook part 41...Protrusion 42…Second hook part 43...Edge 50...Ribs

Claims

1. A webbing guide structure for a vehicle seat, comprising: a seat belt webbing; a seat frame constituting a seat back; and a resin guide member attached to an upper end portion of the seat frame and guiding the webbing, the guide member includes a top wall extending in the front-rear direction of the vehicle seat, a front wall extending downward in the up-down direction of the vehicle seat from a front end portion of the top wall, side walls extending downward from ends of the top wall in the width direction of the vehicle seat, a rear wall extending downward from a rear end portion of the top wall, and an insertion opening through which the webbing is inserted, The rear wall is provided with a first hook portion, the webbing extends from the lower side toward the rear end portion of the top wall and extends from the rear end portion to the front side in the front-to-rear direction, The seat frame is provided with a second hook portion that is hooked onto the first hook portion to restrict the first hook portion from moving upward in the up-down direction. A guide structure for webbing in a vehicle seat.

2. the guide member has a fastening portion that fastens the guide member to the seat frame, The fastening portion is provided on at least one of the front wall and the side wall among the rear wall, the front wall, and the side wall. The guide structure for a webbing of a vehicle seat according to claim 1.

3. the first hook portion is a protruding portion that protrudes rearward in the front-rear direction, The second hooking portion is positioned above the protruding portion and hooked onto the protruding portion. The guide structure for a webbing of a vehicle seat according to claim 2.

4. the seat frame is provided with a hole that opens to the upper side and into which the rear wall is inserted, The second hook portion is an edge portion on the rear side of the hole. The guide structure for a webbing of a vehicle seat according to claim 3.

5. a rib is provided on a surface of the rear wall facing the seat frame, the seat frame is provided with a contact surface that faces the rib in the front-rear direction and that comes into contact with the rib. The guide structure for a webbing of a vehicle seat according to any one of claims 1 to 4.

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