Vehicle seats

Abstract

To provide a vehicular seat as one example that can suppress a position where a seat belt is supported from being largely shifted downward, even when large tension is generated in the seat belt.SOLUTION: A lateral guide 71 of a belt guide 7 is positioned at a front side and an upper side of a seat, with respect to a stationary part 73 of the belt guide 7, and further two side part guides 72 have linear portions 74 extending linearly from the lateral guide 71 toward a back frame 5 side. This enables most of downward loads acting on the lateral guide 71 to act on the linear portions 74 as compressive loads, in the belt guide 7, so that bending moment Mo occurring in the side part guides 72 become smaller, in the belt guide 7. This can suppress a position where the seat belt is supported from being shifted largely downward, even when large tension acts on the lateral guide 71.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle seat having a belt guide for a seat belt. [Background technology]

[0002] As shown in Patent Document 1, a belt guide for a seat belt is provided above a seat back and receives tension generated in a so-called shoulder belt. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5305430 Summary of the Invention [Problem to be solved by the invention]

[0004] When a large tension is generated in the seat belt, a downward force acts on the belt guide in addition to a force toward the front of the seat. If the belt guide is deformed and the position where the seat belt is supported is displaced significantly downward, the seat belt may no longer be supported in the appropriate position.

[0005] In view of the above, the present disclosure discloses an example of a vehicle seat that can prevent the position that supports the seat belt from being displaced significantly downward even when a large tension is generated in the seat belt. [Means for solving the problem]

[0006] A vehicle seat having a back frame (5) that forms the framework of the seat back and a belt guide (7) fixed to the upper side of the back frame (5) and that transmits the tension acting on the seat belt to the back frame (5) preferably has at least one of the following constituent features:

[0007] In other words, the constituent elements are that the belt guide (7) is a rod-shaped lateral guide (71) that extends in the seat width direction and can come into contact with the seat belt over the entire width direction, and is equipped with the lateral guide (71) that receives the tension generated in the seat belt, side guides (72) that are provided at one end and the other end of the longitudinal direction of the lateral guide (71) and extend from the lateral guide (71) toward the back frame (5), and fixed portions (73) that are provided at the tip ends of each of the two side guides (72) in the extension direction and fixed to the back frame (5), the lateral guide (71) is located on the front side and above the seat with respect to the fixed portions (73), and further, the two side guides (72) have straight portions (74) that extend linearly from the lateral guide (71) toward the back frame (5).

[0008] As a result, in the belt guide 7, most of the downward load acting on the lateral guide 71 acts as a compressive load on each straight portion 74. Accordingly, in the belt guide 7, the bending moment generated in each side guide 72 is reduced. Therefore, even if a large tension on the seat belt acts on the lateral guide 71, the position supporting the seat belt can be prevented from being displaced significantly downward.

[0009] It is desirable that the cross-sectional shape of each of the fixing portions (73) is configured to be flat, and that the second moment of area of ​​each of the two side guides (72) is greater than the second moment of area of ​​each of the two fixing portions (73).

[0010] Furthermore, the fixed portion (73) is curved so as to grip a portion of the back frame (5) from the rear side of the seat, and a connecting portion (75) connected to the fixed portion (73) is provided at the tip end of each of the two side guides (72) in the extension direction, and it is desirable that the connecting portion (75) contacts the back frame (5) and is configured to have a load receiving portion (76) connected to the fixed portion (73), and a curved portion (77) curved in an arc shape that connects the load receiving portion (76) and the straight portion (74).

[0011] Furthermore, the horizontal guide 71, the straight portion 74, the curved portion 77, the load receiving portion 76, and the fixed portion 73 are preferably made of a single piece of steel.

[0012] Incidentally, the symbols in each of the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0013] [Figure 1] 3A and 3B are diagrams showing a back frame, a belt guide, and the like according to the first embodiment. [Figure 2] FIG. 2 is a view showing a belt guide according to the first embodiment. [Figure 3] FIG. 2 is a view showing a belt guide according to the first embodiment. [Figure 4] FIG. 2 is a view showing a belt guide according to the first embodiment. [Figure 5] FIG. 2 is a view showing a belt guide according to the first embodiment. [Figure 6] FIG. 2 is a view showing a belt guide according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following "Embodiments of the Invention" are examples of embodiments that fall within the technical scope of the present disclosure. In other words, the invention-specific matters set forth in the claims are not limited to the specific configurations, structures, etc. shown in the following embodiments.

[0015] This embodiment is an example in which a vehicle seat according to the present disclosure is applied to a seat (hereinafter referred to as a vehicle seat) mounted on a vehicle such as a car. Arrows and diagonal lines indicating directions are added to each figure to make it easier to understand the relationship between the figures and the shapes of components or parts.

[0016] Therefore, the vehicle seat is not limited to the directions indicated in the drawings. The directions indicated in the drawings are directions when the vehicle seat according to the present embodiment is assembled to a vehicle. Also, the hatched drawings do not necessarily represent cross-sectional views.

[0017] At least one component or part that is described with a reference numeral is provided unless otherwise specified, such as "one." In other words, unless otherwise specified, such as "one," two or more components may be provided. The vehicle seat disclosed in the present disclosure includes at least the components or parts that are described with a reference numeral.

[0018] (First embodiment) <1. Overview of vehicle seats (seat backs)> The vehicle seat 1 shown in Fig. 1 is a part of a vehicle seat used in the rear seat of a vehicle. The seat back 3 is a part for supporting the back of a seated occupant. The seat back 3 is an integrated unit consisting of the seat back of a seat at one end in the vehicle width direction (the right side in Fig. 1) and the seat back of a seat in the center in the vehicle width direction.

[0019] The seat back 3 includes at least a back frame 5, a belt guide 7, and a cushioning material (not shown). The back frame 5 is a member that forms the framework of the seat back 3. The back frame 5 according to this embodiment is a member formed by bending a metal pipe material into a rectangular frame shape.

[0020] When the back frame 5, i.e., the seat back 3, is mounted on a vehicle, the lower portion at one end of the seat width direction, the lower portion at the other end of the seat width direction, and the upper portion at one end of the seat width direction are directly or indirectly connected to the vehicle.

[0021] The belt guide 7 is fixed to the upper side of the back frame 5. Specifically, the belt guide 7 is fixed to a beam-shaped portion 5A of the back frame 5. The beam-shaped portion 5A is a portion that extends approximately horizontally in the seat width direction above the back frame 5.

[0022] The belt guide 7 receives tension generated in the seat belt 11 and transmits the tension to the back frame 5. That is, a retractor (winding device) 11A for the seat belt 11 is fixed to the back frame 5 via a reinforcing wire or the like.

[0023] When the seat belt 11 is in use, the shoulder belt of the seat belt 11 extends obliquely downward from the belt guide 7. Therefore, when tension is generated in the seat belt 11, at least a load toward the front of the seat and a load toward the downward direction act on the belt guide 7.

[0024] <2. Belt guide structure> 2 and 3, the belt guide 7 is configured to have one lateral guide 71, two side guides 72, and two fixed portions 73, etc. As shown in Fig. 4, each of the two side guides 72 is configured to have a straight portion 74 and a connecting portion 75, etc. Each connecting portion 75 is configured to have a load receiving portion 76 and a curved portion 77, etc.

[0025] As shown in FIG. 2, the lateral guide 71 is a rod-shaped portion that extends in the seat width direction and can come into contact with the seat belt 11 over the entire width direction, and is a portion that receives tension generated in the seat belt 11.

[0026] As shown in FIG. 3, the two side guides 72 are provided at one end and the other end of the horizontal guide 71 in the longitudinal direction, respectively, and are portions that extend from the horizontal guide 71 toward the back frame 5 side.

[0027] The two fixing portions 73 are provided at the tip ends of the two side guides 72 in the extension direction, respectively, and are fixed to the back frame 5. As shown in Fig. 4, each fixing portion 73 is curved in a C-shape so as to grip a part of the back frame 5 from the rear side of the seat.

[0028] Each fixing portion 73 according to this embodiment is fixed to the back frame 5 by welding at a location indicated by "xxx" in Fig. 4. In other words, the belt guide 7 according to this embodiment is fixed to the surface of the back frame 5 on the seat rear side by welding.

[0029] The lateral guide 71 is located on the front side of the seat and above each fixed portion 73. Specifically, the lateral guide 71 is located forward of the front end of the back frame 5 and above the upper end of the back frame 9.

[0030] Furthermore, the two straight portions 74 extend linearly from the lateral guide 71 toward the back frame 5. In this embodiment, if each straight portion 74 were extended to the back frame 5, the extended straight portion 74 (see imaginary line L1) would be located at the front end of the back frame 5.

[0031] The connecting portion 75 is a portion provided on the tip side of each side guide 72 in the extension direction and connected to the corresponding fixed portion 73. In other words, each connecting portion 75 is located between each straight portion 74 and the corresponding fixed portion 73 and connects each straight portion 74 and the corresponding fixed portion 73.

[0032] Each load receiving portion 76 is in contact with the back frame 5 and is connected to each fixing portion 73. Each load receiving portion 76 is curved to fit along the back frame 5 and contacts the back frame 5, and is not fixed to the back frame 5 by welding.

[0033] Each curved portion 77 is a portion curved in an arc shape that connects each load receiving portion 76 and the corresponding straight portion 74. As shown in FIG. 2, the horizontal guide 71, each straight portion 74, each curved portion 77, each load receiving portion 76, and each fixed portion 73 are formed from a single steel material by bending.

[0034] 5, the cross-sectional shape of each fixing portion 73 is configured to be flat. The second moment of area of ​​each side guide 72 is greater than the second moment of area of ​​each fixing portion 73. Note that the second moment of area is the second moment of area about a neutral axis parallel to the seat width direction.

[0035] Specifically, the second moment of area for each fixing portion 73 is the second moment of area about a neutral axis parallel to the major axis direction, and the second moment of area for each side guide 72 is the second moment of area about a neutral axis parallel to the lateral guide 71.

[0036] In this embodiment, the cross-sectional shape of the horizontal guide 71 and each side guide 72 is the cross-sectional shape of a solid round bar that is the material. The cross-sectional shape of each fixing portion 73 is a substantially oval shape that is formed by flattening the solid round bar by plastic processing.

[0037] 3. Features of the Vehicle Seat (Especially the Belt Guide) According to the Present Embodiment When a large tension acts on the seat belt 11, a downward load Fo (see FIG. 6) acts on the belt guide 7. The load Fo generates a bending moment Mo that moves the lateral guide 71 downward.

[0038] 6, the lateral guide 71 indicated by the two-dot chain line indicates the position when the connecting portion 75 is configured in a straight line connected to the straight portion 74. If a load Fo acts on the lateral guide 71 indicated by the two-dot chain line, the bending moment M1 will be larger than the bending moment Mo because the arm length is larger than in this embodiment (see FIG. 6).

[0039] That is, in the belt guide 7 according to this embodiment, most of the load Fo acting on the lateral guide 71 acts as a compressive load on each straight portion 74. Accordingly, in this embodiment, the length of the arm that generates the bending moment Mo is shortened, and therefore the bending moment Mo is also shortened.

[0040] Furthermore, even if a large tension is applied to the seat belt 11 on the lateral guide 71, it is possible to prevent the support position of the seat belt 11 from being displaced significantly downward. Note that the buckling deformation of the straight portion 74 and the connecting portion 75 is negligibly small.

[0041] Furthermore, the position of the "horizontal guide 71" is located above the "horizontal guide 71 shown by the two-dot chain line." Therefore, even if the downward displacement amount of the "horizontal guide 71" is the same as the downward displacement amount of the "horizontal guide 71 shown by the two-dot chain line," the position of the "horizontal guide 71" after displacement is located above the "horizontal guide 71 shown by the two-dot chain line" after displacement.

[0042] Moreover, as described above, in reality, the downward displacement of the "lateral guide 71" is smaller than the downward displacement of the "lateral guide 71 indicated by the dotted line," so the position supporting the seat belt 11 can be prevented from being displaced significantly downward.

[0043] Furthermore, since the second moment of area of ​​each of the two side guides 72 is greater than the second moment of area of ​​each of the two fixing portions 73, it is possible to reliably prevent the position supporting the seat belt 11 from being displaced significantly downward.

[0044] (Other embodiments) In the above-described embodiment, the lateral guide 71, the straight portions 74, the curved portions 77, the load receiving portions 76, and the fixed portions 73 are formed from a single steel material by bending, as shown in Fig. 2. However, the present disclosure is not limited to this.

[0045] That is, the disclosure may be, for example, an L-shaped member in which the lateral guide 71 is configured as a separate member, and each side guide 72 is configured only with a straight portion 74 and a load-receiving portion 76, with each curved portion 77 eliminated.

[0046] In the above-described embodiment, each fixing portion 73 is configured to have a flat shape. However, the present disclosure is not limited to this. That is, in the present disclosure, for example, each fixing portion 73 may also be configured to maintain the same cross-sectional shape as the linear portion 74.

[0047] In the above-described embodiment, each fixing portion 73 is configured to be curved in a C-shape so as to grip a portion of the back frame 5 from the rear side of the seat. However, the present disclosure is not limited to this. In other words, the present disclosure is sufficient as long as the fixing portion 73 has a shape that follows the outer shape of the beam-like portion 5A, for example.

[0048] In the above-described embodiment, a portion of the fixing portion 73 is welded to the back frame 5. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, the fixing portion 73 and the load receiving portion 76 are welded to the back frame 5.

[0049] In the above-described embodiment, if each straight portion 74 were extended to the back frame 5, the extended straight portion 74 (see the imaginary line L1) would be located at the front end of the back frame 5. However, the present disclosure is not limited to this.

[0050] In the above-described embodiment, the vehicle seat according to the present disclosure is applied to a vehicle. However, the application of the invention disclosed in this specification is not limited thereto. That is, the present disclosure can also be applied to seats used in vehicles such as railway cars, ships, and aircraft, as well as stationary seats used in theaters, homes, etc.

[0051] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0052] 1... Vehicle seat 3... Seat back 5... Back frame 5A... Beam-shaped part 7... Belt guide 9... Back frame 11... Seat belt 71... Lateral guide 72... Side guide 73: Fixed portion 74: Straight portion 75: Connecting portion 76: Load receiving portion 77... Curved section

Claims

1. A back frame that forms the framework of the seat back, a belt guide fixed to an upper side of the back frame, the belt guide transmitting tension acting on the seat belt to the back frame; In a vehicle seat comprising: The belt guide is a rod-shaped lateral guide extending in the seat width direction and capable of contacting the seat belt over the entire width direction, the lateral guide receiving tension generated in the seat belt; Side guides are provided at one end and the other end of the horizontal guide in the longitudinal direction, and extend from the horizontal guide toward the back frame; and a fixing portion provided at a tip end of each of the two side guides in the extension direction and fixed to the back frame; the lateral guide is located on the front side and upper side of the seat with respect to the fixed portion, Furthermore, the two side guides have a straight portion extending in a straight line from the lateral guide toward the back frame side, and a curved portion located between the fixed portion and the straight portion and curved in an arc shape convex toward the lower side of the seat.

2. A back frame that forms the framework of the seat back, a belt guide fixed to an upper side of the back frame, the belt guide transmitting tension acting on the seat belt to the back frame; In a vehicle seat comprising: The belt guide is a rod-shaped lateral guide extending in the seat width direction and capable of contacting the seat belt over the entire width direction, the lateral guide receiving tension generated in the seat belt; Side guides are provided at one end and the other end of the horizontal guide in the longitudinal direction, and extend from the horizontal guide toward the back frame; and a fixing portion provided at a tip end of each of the two side guides in the extension direction and fixed to the back frame; the lateral guide is located on the front side and upper side of the seat with respect to the fixed portion, Furthermore, the two side guides have linear portions that extend linearly from the lateral guides toward the back frame, A vehicle seat in which each of the fixing portions has a flat cross-sectional shape.

3. A vehicle seat as described in Claim 2, wherein the second moment of area of ​​each of the two side guides is greater than the second moment of area of ​​each of the two fixed portions.

4. the fixing portion is curved so as to grip a part of the back frame from the rear side of the seat, A connecting portion connected to the fixing portion is provided at a tip end side of each of the two side guides in the extension direction, The connecting portion is a load receiving portion that contacts the back frame and is connected to the fixed portion; The vehicle seat according to claim 1 , wherein the curved portion connects the load receiving portion and the straight portion.

5. 5. The vehicle seat according to claim 4, wherein the lateral guide, the straight portion, the curved portion, the load receiving portion, and the fixed portion are formed from a single steel material.

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