Vehicle seat

Abstract

To provide a vehicle seat that can achieve simplification of configuration while applying energization force to a seat back.SOLUTION: A vehicle seat 10 has: a seat back side frame 30 which constitutes a part of a skeleton of a seat back 16 for supporting a back part of a crewman, extends along a side part of the seat back 16, and is configured from a pipe material; a support bracket 22 which supports the seat back 16 so that the seat back can rotate around a seat width direction with respect to a seat cushion capable of supporting a hip and a thigh part of the crewman, and in which a long hole part 42 penetrated in the seat width direction is formed; and an energization component 38 comprising an insertion part 38A inserted in the seat back side frame 30, an insertion part 38B that is inserted through the long hole part 42 and contacts the long hole part 42 during inclining of the seat back 16, and an energization force generating part 38C which applies energization force to the seat back 16 during inclining of the seat back 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] Patent Document 1 below discloses an invention relating to a vehicle seat. In this vehicle seat, a seat back is biased by a spiral spring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-130261 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the prior art of Patent Document 1, multiple parts such as brackets and bearings are used to attach the spiral spring, and there is room for improvement in terms of simplifying the configuration while applying a spring force to the seat back.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a vehicle seat that can apply a biasing force to the seat back while simplifying the structure. [Means for solving the problem]

[0006] The vehicle seat according to the first aspect includes a seatback side frame made of pipe material, which forms part of the skeleton of the seatback that supports the back of the occupant, extends along the side of the seatback, and supports the seatback rotatably around the seat width direction relative to a seat cushion that can support the buttocks and thighs of the occupant, and has a through-portion that penetrates in the seat width direction; and a biasing member that includes an insertion portion inserted into the seatback side frame, an insertion portion that is inserted into the through-portion and abuts against the support portion when the seatback is tilted, and a biasing force generating portion that is interposed between the insertion portion and the insertion portion and applies a biasing force to the seatback when the seatback is tilted.

[0007] In the vehicle seat according to the first aspect, part of the framework of the seat back that supports the back of the occupant is made up of a seat back side frame, which extends along the side of the seat back and is made up of a pipe material.

[0008] In this aspect, the seat back is supported by the support portion so as to be rotatable around the seat width direction relative to the seat cushion that can support the buttocks and thighs of the occupant.

[0009] Incidentally, when biasing the seat back against the seat cushion, it is conceivable to adopt a configuration in which a spiral spring is interposed between the seat back and the seat cushion.

[0010] However, when such a configuration is adopted, it is necessary to use a plurality of parts such as bearings to mount the spiral spring.

[0011] In this aspect, the seat back is biased by a biasing member that includes an insertion portion, an insertion portion, and a biasing force generating portion that is interposed between the insertion portion and the insertion portion.

[0012] Specifically, the insertion portion is inserted into the seatback side frame, and the insertion portion is inserted into a through-hole formed in the support portion and passing through the support portion in the seat width direction. In this aspect, when the insertion portion abuts against the support portion when the seatback is tilted, the biasing force generated in the biasing force generating portion is applied to the seatback.

[0013] Therefore, in this aspect, the number of parts can be reduced compared to a configuration in which the seat back is biased by a spiral spring.

[0014] A vehicle seat according to a second aspect is the vehicle seat according to the first aspect, wherein the biasing force generating portion is a coil spring whose axial direction is the seat width direction.

[0015] According to the second aspect of the vehicle seat, the spring-loading portion is a coil spring, and the spring-loading portion is torsionally deformed around the seat width direction, thereby ensuring the amount of relative movement between the insertion portion and the insertion-through portion around the seat width direction, and thus ensuring the stroke of the seat back.

[0016] A vehicle seat according to a third aspect is the vehicle seat according to the first aspect, wherein the biasing force generating portion is a torsion bar extending in the seat width direction.

[0017] According to the vehicle seat of the third aspect, the biasing force generating portion is a torsion bar extending in the seat width direction, and the biasing force generating portion is torsionally deformed around the seat width direction to move the insertion portion and the insertion-through portion relative to each other around the seat width direction. Furthermore, compared to a configuration in which the biasing force generating portion is a coil spring, the space required for installing the biasing member can be reduced.

[0018] The vehicle seat according to the fourth aspect is the vehicle seat according to the third aspect, in which a crushed portion is formed by crushing the seatback side frame toward the inner periphery at the portion above the seat of the seatback side frame, and a locking portion formed by bending the tip end of the insertion portion is locked to the inner periphery of the crushed portion.

[0019] According to the fourth aspect of the vehicle seat, a crushed portion is formed in the seat upper portion of the seatback side frame by crushing the seatback side frame toward the inner periphery. The inner periphery of the crushed portion is engaged with a locking portion formed by bending the tip end of the insertion portion.

[0020] Therefore, in this aspect, the relative movement between the insertion portion and the seatback side frame is restricted, and the biasing force of the biasing member can be efficiently transmitted to the seatback side frame.

[0021] A vehicle seat according to a fifth aspect is a vehicle seat according to any one of the first to fifth aspects, wherein the through-hole is formed along an arc centered on a pivot axis of the seat back relative to the seat cushion when viewed from the seat width direction.

[0022] According to the vehicle seat of the fifth aspect, the through-hole formed in the support portion is formed along an arc centered on the pivot axis of the seat back relative to the seat cushion when viewed from the seat width direction, and the insertion portion of the urging member can be displaced along the through-hole.

[0023] When the seat back is tilted, if an initial input is applied to the seat back by the biasing member, the seat back can be displaced by inertial movement.

[0024] However, in a configuration in which the size of the through-hole is approximately the same as the cross-sectional area of ​​the insertion portion of the biasing member, the biasing force of the biasing member acts as resistance to the inertial movement of the seat back immediately after the initial input from the biasing member to the seat back when the seat back is tilted, and therefore such a configuration is not preferable from the perspective of ensuring the stroke of the seat back.

[0025] In this aspect, the insertion portion of the biasing member can be moved along the through-hole formed in the support portion immediately after the initial input from the biasing member to the seat back when the seat back is tilted. In other words, in this aspect, the seat back can be moved by inertia while the insertion portion of the biasing member is moving along the through-hole in the support portion. As a result, in this aspect, the stroke of the seat back can be further ensured. [Effects of the Invention]

[0026] As described above, the vehicle seat according to the present invention has the excellent effect of being able to simplify the configuration while applying a biasing force to the seat back. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a front view schematically showing the configuration of a main part of a vehicle seat according to a first embodiment. [Figure 2] 1 is a side view schematically showing the configuration of a vehicle seat according to a first embodiment. [Figure 3] 1 is a side view (view taken in the direction of arrow 3 in FIG. 1) that schematically shows the configuration of a main part of the vehicle seat according to the first embodiment. [Figure 4] FIG. 10 is a front view schematically showing the configuration of a main part of a vehicle seat according to a second embodiment. [Figure 5] 5 is a cross-sectional view (a cross-sectional view showing a state cut along line 5-5 in FIG. 4) that schematically shows the relationship between the seatback side frame and the biasing member in the vehicle seat according to the second embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0028] First Embodiment A first embodiment of a vehicle seat according to the present invention will be described below with reference to Figures 1 to 3. Note that arrows FR, UP, and LH, which are appropriately shown in each figure, respectively indicate the forward direction, upward direction, and left direction of a "vehicle seat 10 (hereinafter referred to as seat 10)" according to this embodiment. In this embodiment, the forward direction of the seat generally coincides with the forward direction of a vehicle 12 on which the seat 10 is mounted, the upward direction of the vehicle 12, and the leftward direction of the seat 10 generally coincides with the leftward direction of the vehicle 12.

[0029] As shown in FIG. 2, the seat 10 is for use in the rear seat and includes a "seat cushion 14" that supports the buttocks and thighs of the occupant, a "seat back 16" that supports the back of the occupant, and a headrest 17 that supports the head of the occupant.

[0030] The seat cushion 14 includes a seat cushion pad 18, which constitutes the main part of the seat cushion 14 and is made of urethane foam, and a seat cushion frame 20, which constitutes the skeleton of the seat cushion 14. The seat cushion 14 is supported on the floor portion F of the vehicle 12.

[0031] Meanwhile, the lower end of the seat back 16 is connected to a center hinge portion H provided on the floor portion F via a "support bracket 22" serving as a support portion. The configuration of the support bracket 22 will be described later. It is also possible to adopt a configuration in which the seat rear portion of the seat cushion frame 20 and the lower end of the seat back 16 are connected by the support bracket 22.

[0032] The seat back 16 includes a seat back pad 24 that constitutes the main part of the seat back and is made of urethane foam, and a seat back frame 26 that constitutes the framework of the seat back.

[0033] More specifically, as shown in FIG. 1, the seatback frame 26 includes a pair of “seatback side frames 30 ”, a seatback upper frame (not shown), and a seatback lower frame 32 .

[0034] The seatback side frames 30 are made of pipe material and extend along the sides of the seatback 16, and are arranged at intervals from each other in the seat width direction. As shown in Figure 5, the portion of the seatback side frame 30 above the seat has four recesses on the inner periphery of the seatback side frame 30 at equal intervals in the circumferential direction.

[0035] Hereinafter, this portion of the seatback side frame 30 will be referred to as the "crushed portion 30A." Furthermore, the position of the crushed portion 30A in the seat up-down direction coincides with the position in the seat up-down direction of an upper corner B1 of a rectangular parallelepiped test block B with a side length of 300 mm that is placed on a loading platform D provided behind the seat 10 in the vehicle 12, when the seatback 16 is in the design reference position, as shown in Fig. 2.

[0036] 1, a spacer 34 is provided at the end of the seatback side frame 30 on the seat underside. This spacer 34 is configured to include a cylindrical fitting portion 34A that can be fitted into the seatback side frame 30, and a disk-shaped abutment portion 34B that abuts against the end surface of the seatback side frame 30 on the seat underside. In addition, the spacer 34 is formed with a through portion 36 that extends in the extension direction of the seatback side frame 30.

[0037] The upper portions of the seatback side frames 30 are connected to each other by a seatback upper frame made of pipe material extending in the seat width direction, and the lower portions of the seatback side frames 30 are connected to each other by a seatback lower frame 32 made of pipe material extending in the seat width direction. The headrest 17 is supported by a headrest holder (not shown) provided on the seatback upper frame.

[0038] The seatback side frame 30 configured as described above is pivotally supported by the support bracket 22 via a connecting bracket 37 provided on the lower portion of the seat so as to be rotatable around the width direction of the seat.

[0039] Here, this embodiment is characterized in that the seat back 16 can be biased against the seat cushion 14 by the support bracket 22 and the "biasing member 38" interposed between the support bracket 22 and the seat back side frame 30. The configurations of the support bracket 22 and the biasing member 38 will be described in detail below.

[0040] The support bracket 22 includes a lower piece 22A whose thickness direction is the seat vertical direction, and a rising piece 22B extending from the outer peripheral edge of the lower piece 22A in the seat width direction toward the upper side of the seat, with its thickness direction also being the seat width direction. The lower piece 22A is attached to the seat cushion frame 20 by an attachment member (not shown).

[0041] 3, the rising piece 22B is formed with a through-hole 40 and an "elongated hole 42" that penetrate in the seat width direction. The through-hole 40 is provided in the rising piece 22B at the front upper side of the seat, and a connecting bracket 37 is attached to the through-hole 40 via a shaft (not shown).

[0042] On the other hand, when viewed from the seat width direction, the elongated hole 42 is formed along an arc having its center at the center of the through-hole 40, i.e., the "rotation axis S" of the seat back 16 relative to the seat cushion 14. A part of the urging member 38 is inserted into the elongated hole 42.

[0043] The biasing member 38 is formed by bending a steel wire, and includes an "insertion portion 38A," a "through-hole portion 38B," and a "biasing force generating portion 38C."

[0044] More specifically, the insertion portion 38A extends linearly and is inserted into the seatback side frame 30. The insertion portion 38A is inserted into the through-hole 36 of the spacer 34, and is thereby positioned so as to be located at the center of a cross section of the seatback frame 26 as viewed from the extension direction thereof.

[0045] On the other hand, the insertion portion 38B extends in the seat width direction and is inserted into the long hole portion 42 of the rising piece portion 22B, so that it displaces along the long hole portion 42 when the seat back 16 rotates around the rotation axis S.

[0046] The biasing force generating portion 38C is interposed between the insertion portion 38A and the insertion portion 38B, and is a coil spring with its axial direction aligned with the seat width direction. The biasing force generating portion 38C is capable of applying a biasing force to the seat back 16 when the seat back 16 is tilted rearward by a predetermined angle or more from a state in which it is in the design standard position, or when the seat back 16 is tilted forward by a predetermined angle or more from a state in which it is in the design standard position.

[0047] <Actions and Effects of This Embodiment> Next, the operation and effects of this embodiment will be described.

[0048] 2, in this embodiment, part of the framework of the seat back 16 that supports the back of the occupant is made up of a seat back side frame 30. This seat back side frame 30 extends along the side of the seat back 16 and is made up of a pipe material.

[0049] In this embodiment, the seat back 16 is supported by the support bracket 22 so as to be rotatable about the seat width direction relative to the seat cushion 14, which is capable of supporting the buttocks and thighs of the occupant.

[0050] Incidentally, when biasing the seat back 16 against the seat cushion 14, it is conceivable to adopt a configuration in which a spiral spring is interposed between the seat back 16 and the seat cushion 14.

[0051] However, when such a configuration is adopted, it is necessary to use a plurality of parts such as bearings to mount the spiral spring.

[0052] In this embodiment, as shown in FIG. 1, the seat back 16 is biased by a biasing member 38 having an insertion portion 38A, an insertion portion 38B, and a biasing force generating portion 38C interposed between the insertion portion 38A and the insertion portion 38B.

[0053] More specifically, the insertion portion 38A is inserted into the seatback side frame 30, and the insertion portion 38B is inserted into an elongated hole 42 that is formed in the support bracket 22 and penetrates the support bracket 22 in the seat width direction. In this embodiment, when the insertion portion 38B abuts against the end of the elongated hole 42 when the seatback 16 is tilted, the biasing force generated in the biasing force generating portion 38C is applied to the seatback 16.

[0054] Therefore, in this embodiment, the number of parts can be reduced compared to a configuration in which the seat back 16 is biased by a spiral spring.

[0055] In addition, in this embodiment, the spring force generating portion 38C is a coil spring, and the spring force generating portion 38C is torsionally deformed around the seat width direction, thereby ensuring the amount of relative movement between the insertion portion 38A and the insertion portion 38B around the seat width direction, and ultimately ensuring the stroke of the seat back 16.

[0056] In addition, in this embodiment, as shown in FIG. 3, the elongated hole portion 42 formed in the support bracket 22 is formed along an arc centered on the pivot axis S of the seat back 16 relative to the seat cushion 14 when viewed from the seat width direction, and the insertion portion 38B of the urging member 38 can be displaced along the elongated hole portion 42.

[0057] When the seat back 16 is tilted, if there is an initial input to the seat back 16 by the biasing member 38, the seat back 16 can be displaced by inertial movement.

[0058] However, in a configuration in which the size of the through-hole through which the insertion portion 38B of the urging member 38 is inserted is approximately the same as the cross-sectional area of ​​the insertion portion 38B, when the seat back 16 is tilted, the urging force of the urging member 38 acts as resistance to the inertial movement of the seat back 16 immediately after the initial input from the urging member 38 to the seat back 16, and therefore, such a configuration is not preferable from the viewpoint of ensuring the stroke of the seat back 16.

[0059] Here, in this embodiment, when the seat back 16 is tilted, immediately after an initial input is applied from the biasing member 38 to the seat back 16, the insertion portion 38B of the biasing member 38 can be moved along the elongated hole portion 42 formed in the support bracket 22. In other words, in this embodiment, while the insertion portion 38B of the biasing member 38 is moving along the elongated hole portion 42, the seat back 16 can be moved by inertia, and as a result, in this embodiment, the stroke of the seat back 16 can be further ensured.

[0060] As described above, the seat 10 according to this embodiment can provide a biasing force to the seat back 16 while simplifying the configuration.

[0061] In addition, in this embodiment, as shown in FIG. 2, a collapsed portion 30A is provided in the portion above the seat of the seatback side frame 30, and the collapsed portion 30A has lower bending rigidity than other portions of the seatback side frame 30.

[0062] Therefore, in this embodiment, when the vehicle 12 is involved in a frontal collision, etc., and the test block B moves inertially toward the front of the vehicle and comes into contact with the crushed portion 30A, the portion of the seatback side frame 30 above the crushed portion 30A will bend and deform toward the rear of the seat, starting from the crushed portion 30A.

[0063] As a result, in this embodiment, when the vehicle 12 is involved in a frontal collision or the like, the headrest 17 can be prevented from moving toward the occupant.

[0064] Second Embodiment A second embodiment of the vehicle seat according to the present invention will be described below with reference to Figures 4 and 5. Note that the same components as those in the first embodiment described above are given the same reference numerals and descriptions thereof will be omitted.

[0065] In the "vehicle seat 50 (hereinafter referred to as the seat 50)" according to this embodiment, as shown in FIG. 4, the "biasing member 52" is formed by bending a steel wire similar to the biasing member 38, and includes an "insertion portion 52A" and an "insertion portion 52B," but the "biasing force generating portion 52C" is a torsion bar extending in the seat width direction.

[0066] As shown in FIG. 5, the tip of the insertion portion 52A is bent into a U-shape that protrudes upward toward the seat, forming a "locking portion 52A1." This locking portion 52A1 is locked to the inner periphery of the crushed portion 30A of the seatback side frame 30.

[0067] 4, the biasing force generating portion 52C is a torsion bar extending in the seat width direction, and the biasing force generating portion 52C is torsionally deformed around the seat width direction, thereby allowing the insertion portion 52A and the insertion-through portion 52B to move relative to each other around the seat width direction. Therefore, the present embodiment also basically provides the same functions and effects as the first embodiment described above.

[0068] Furthermore, in this embodiment, the space required for installing the biasing member 52 can be reduced compared to a configuration in which the biasing force generating portion 52C is a coil spring.

[0069] Furthermore, in this embodiment, as shown in FIG. 5, a locking portion 52A1 formed by bending the tip of the insertion portion 52A is locked to the inner periphery of a crushed portion 30A provided in the upper seat portion of the seatback side frame 30.

[0070] Therefore, in this embodiment, the relative movement between the insertion portion 52A and the seatback side frame 30, more specifically, the relative rotation of the insertion portion 52A with respect to the seatback side frame 30 around the extension direction of the seatback side frame 30 is restricted, thereby allowing the biasing force of the biasing member 52 to be efficiently transmitted to the seatback side frame 30. [Explanation of symbols]

[0071] 10 Vehicle seats 14 seat cushion 16 Seat back 22 Support bracket (support part) 30 Seatback side frame 30A crushed part 38 biasing member 38A Insertion section 38B Insertion part 38C Force generating section 42 Long hole section (through section) 50 Vehicle seats 52 biasing member 52A Insertion section 52A1 Locking part 52B Insertion part 52C Force generating section S Rotating shaft

Claims

1. a seatback side frame made of a pipe material, which forms part of a framework of the seatback that supports the back of the occupant and extends along a side of the seatback; a support portion that supports the seat back rotatably around the seat width direction relative to a seat cushion that can support the buttocks and thighs of an occupant and that has a through-portion that penetrates in the seat width direction; an urging member including: an insertion portion inserted into the seatback side frame; an insertion portion inserted through the through-hole and abutting against the support portion when the seatback is tilted; and an urging force generating portion interposed between the insertion portion and the insertion portion and applying an urging force to the seatback when the seatback is tilted; A vehicle seat having:

2. The biasing force generating portion is a coil spring whose axial direction is the seat width direction. The vehicle seat according to claim 1 .

3. The biasing force generating portion is a torsion bar extending in the seat width direction. The vehicle seat according to claim 1 .

4. A crushed portion is formed by crushing the seatback side frame toward the inner periphery of the seat upper side of the seatback side frame, and a locking portion formed by bending the tip end of the insertion portion is locked to the inner periphery of the crushed portion. The vehicle seat according to claim 3.

5. The through-hole is formed along an arc having a center at a pivot axis of the seat back relative to the seat cushion as viewed in the seat width direction. The vehicle seat according to any one of claims 1 to 4.

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