Vehicle seat

Abstract

The invention provides a vehicle seat. The seat for the vehicle is arranged on the vehicle and comprises a seat backrest serving as a backrest; and an impact absorbing member that absorbs an impact input to the seat back from the rear. The seat back has a main body portion in which the impact absorbing member is built, a back surface covering portion that covers the back surface of the main body portion, and a tension relieving portion that relieves the tension of the back surface covering portion when the head of a rear seat occupant collides with the back surface covering portion from the rear.

Description

Technical Field

[0001] The present invention relates to a vehicle seat arranged on a vehicle. Background Art

[0002] Japanese Patent Application Laid-Open No. 2016-7936 discloses a conventional vehicle seat. The vehicle seat is provided with a shock absorbing member built into the seat back in order to improve the occupant protection performance when the vehicle is involved in a rear-end collision. The shock absorbing member is configured to absorb the shock by compressing and deforming when receiving an excessive load from the seated occupant. Summary of the invention

[0003] However, in a vehicle with a rear seat arranged behind the front seat, when a head-on collision occurs, the rear seat occupant sitting on the rear seat is subjected to a forward load toward the seat back of the front seat. At this time, it is conceivable that the head of the rear seat occupant will collide with the back of the seat back of the front seat in a configuration structure in which the space between the front seat and the rear seat is relatively narrow.

[0004] Therefore, in the design of such a vehicle seat, in order to improve the protection performance of rear seat passengers when the vehicle is in a head-on collision, a structure disclosed in Japanese Patent Application Laid-Open No. 2016-7936 in which an impact absorbing component is built into the seat back can be adopted. According to this structure, when the vehicle is in a head-on collision, when the front load of the head of the rear seat passenger acts on the impact absorbing component via the cover on the back side of the seat back, the impact absorbing component deforms to absorb the impact, thereby improving the protection performance of the rear seat passengers. However, when the head of the rear seat passenger hits the cover of the seat back, the rear seat passenger cannot absorb the expected impact when the reaction force from the cover is large due to the tightness of the cover, etc., and the degree of damage increases. In such a case, the problem of reduced protection performance of the rear seat passengers may arise.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a technology for effectively improving the occupant protection performance when a rear seat occupant hits a seat back of a front seat in a frontal collision of a vehicle.

[0006] One embodiment of the present invention is a vehicle seat provided in a vehicle. The vehicle seat includes: a seat back serving as a backrest; and a shock absorbing member that absorbs shock inputted to the seat back from the rear. The seat back includes a main body portion in which the shock absorbing member is built, a back cover portion that covers the back of the main body portion, and a tension relief portion that relieves tension on the back cover portion when the head of a rear seat occupant hits the back cover portion from the rear.

[0007] In the vehicle seat of the above-mentioned method, the seat back that serves as the backrest has an impact absorbing component built into the main body, and has a tension relief portion that relieves the tension of the back cover portion when the head of the rear seat passenger hits the back cover portion that covers the back of the main body from the rear. Therefore, according to this vehicle seat, when the vehicle is in a head-on collision, the influence of the reaction force on the head of the rear seat passenger due to the tension of the back cover portion of the seat back can be suppressed to a low level. That is, the head of the rear seat passenger becomes less likely to be restrained by the back cover portion of the seat back. At this time, the impact absorbing component can absorb the impact of the seat back from the head of the rear seat passenger without being significantly hindered by the back cover portion, so that its original impact absorbing function can be fully exerted. As a result, the protection performance of the rear seat passenger sitting on the seat behind the vehicle seat can be improved.

[0008] As described above, according to the above aspect, it is possible to provide a technology that effectively improves the occupant protection performance when a rear seat occupant hits a seat back in a frontal collision of a vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Features, advantages, and technical and industrial significance of exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings, in which like symbols represent like elements, and wherein:

[0010] Figure 1 It is a side view showing a seat arrangement according to the vehicle seat of the first embodiment.

[0011] Figure 2 It is a perspective view of the seat back of the vehicle seat according to the first embodiment as seen from obliquely above and rearward.

[0012] Figure 3 The second cover is shown in the state before the second cover is mounted on the first cover. Figure 2 A three-dimensional view of a seat back.

[0013] Figure 4 for Figure 2 Cross-sectional view taken along line Ⅳ-Ⅳ.

[0014] Figure 5 To express in Figure 4 A sectional view showing a state in which a second cover is installed on a first cover in a seat back.

[0015] Figure 6 To express in Figure 3 sectional view showing a state in an initial stage of a collision in which a front load from a head of a rear seat occupant acts on a second cover member in a seat back.

[0016] Figure 7 To express in Figure 6A cross-sectional view showing a state in which the head of a rear seat occupant moves toward a shock absorbing member in a seat back.

[0017] Figure 8 To express in Figure 7 sectional view showing a state in which an impact absorbing member of a seat back is deformed.

[0018] Fig. 9 It is a perspective view showing a seat back of a vehicle seat according to a second embodiment when viewed from obliquely above and rearward.

[0019] Fig.10 for Fig. 9 Cross-sectional view along line X-X.

[0020] Fig.11 To express in Fig.10 A sectional view showing a state in which a second cover is installed on a first cover in a seat back. DETAILED DESCRIPTION

[0021] In the vehicle seat of the above-mentioned manner, preferably, the back cover portion includes a first cover member and a second cover member, the first cover member has an opening portion arranged at the rear of the impact absorbing member in a manner that allows the head of the rear seat occupant to enter, and the second cover member blocks the opening portion of the first cover member from the rear side, and the tension relief portion is constructed such that the second cover member is mounted on the first cover member in a detachable manner, and when the second cover member is subjected to a front load exceeding a reference value from the head of the rear seat occupant, the second cover member is detached from the first cover member, thereby relieving the tension of the second cover member.

[0022] According to the vehicle seat, when the head of the rear seat passenger hits the second cover of the seat back from behind and the second cover is subjected to a front load exceeding a reference value, the tension relief portion can release the second cover from the first cover to relieve the tension of the second cover. After that, the head of the rear seat passenger enters the main body through the opening of the first cover, so that the impact can be absorbed by the impact absorbing component built into the main body. In contrast, when the vehicle does not have a head-on collision, or when the front load received by the second cover from the head of the rear seat passenger is less than the reference value, the tension relief portion maintains the installation state of the second cover relative to the first cover.

[0023] In the vehicle seat of the above aspect, preferably, the lower end portion of the second cover is fixed to the first cover, and the upper end portion and the side end portion of the second cover are detachably attached to the first cover via the tension relief portion.

[0024] According to the vehicle seat, when the second cover is hit by the head of the rear seat passenger, the lower end portion of the second cover is used as a fixed end portion and the upper end portion is used as a free end portion to move to open the opening portion of the first cover, thereby allowing the head of the rear seat passenger to enter the main body portion through the opening portion. On the other hand, since the lower end portion of the second cover is always fixed to the first cover, the second cover can be easily returned from the open state of the opening portion of the first cover to the closed state.

[0025] In the vehicle seat of the above aspect, preferably, the tension relief portion is configured so that the second cover can be repeatedly attached to and detached from the first cover.

[0026] According to the vehicle seat, by configuring the tension relief portion in a manner that allows the second cover to be repeatedly attached and detached relative to the first cover, the second cover that has been temporarily detached from the first cover when the vehicle has a head-on collision can be easily reattached to the first cover. Therefore, the time and cost required for returning the second cover to its initial state can be kept low.

[0027] In the vehicle seat of the above aspect, the tension relief portion is preferably provided in the vicinity of an opening edge of the opening portion of the first cover member along the opening edge.

[0028] According to the vehicle seat, by providing the tension relief portion near the opening edge of the opening of the first cover along the opening edge, the size of the second cover can be set to slightly exceed the size of the opening of the first cover, thereby keeping the material cost of the second cover low.

[0029] In the vehicle seat of the above aspect, preferably, the back surface cover portion includes a third cover material that covers at least an upper end portion of the second cover material.

[0030] According to this vehicle seat, the third cover member can prevent the appearance from being deteriorated due to the upper end portion of the second cover member being exposed in the state of being attached to the first cover member.

[0031] In the vehicle seat of the above aspect, preferably, the opening of the first cover also serves as an inspection port for inspecting the main body.

[0032] According to this vehicle seat, the opening of the first cover can have a function for inspecting the main body in addition to the function of allowing the head of the rear seat occupant to enter when the vehicle is involved in a head-on collision.

[0033] Hereinafter, specific embodiments of the vehicle seat of the above-described embodiment will be described with reference to the drawings.

[0034] In the drawings referred to in the following description, the arrow FR indicates the front of the vehicle, and the arrow UP indicates the upper side of the vehicle. In addition, unless otherwise specified, the arrow X indicates the front-rear direction (vehicle length direction) of the vehicle seat when the seat back is in the upright position, the arrow Y indicates the left-right direction (vehicle width direction) of the vehicle seat, and the arrow Z indicates the up-down direction (vehicle height direction) of the vehicle seat.

[0035] Implementation Method 1

[0036] like Figure 1 As shown, the vehicle 1 involved in the first embodiment is a vehicle having a three-row seat arrangement structure arranged on a floor 2. That is, the vehicle 1 includes a front row seat, i.e., a vehicle seat 11, and two rear rows of seats, i.e., vehicle seats 12 and 13, arranged at the rear of the vehicle seat 11 in the front-rear direction X.

[0037] The vehicle seat 11 is a seat having a headrest. The passenger C1 sits on the vehicle seat 11. In contrast, the vehicle seats 12 and 13 are high-back seats without headrests. The passenger C2 sits on the vehicle seat 12, and the passenger C3 sits on the vehicle seat 13. At this time, the passenger C3 becomes the rear seat passenger C3 sitting on the vehicle seat 13, which is the rear seat relative to the vehicle seat 12. In this embodiment, a configuration structure in which the space between the vehicle seat 12 and the vehicle seat 13 is relatively narrow is adopted.

[0038] The seat arrangement structure in the vehicle 1 is merely an exemplary structure and is not limited to the Figure 1 For example, the rear seats can be arranged in three or more rows. In addition, the structure and shape of each vehicle seat can be Figure 1 The structure shown may be modified as appropriate. For example, the vehicle seats 12 and 13 may be modified to have a headrest.

[0039] 1. Overall structure of vehicle seats

[0040] like Figure 1 As shown, the vehicle seat 12 (hereinafter referred to as the "seat 12") includes: a seat cushion 40 having a seat surface; a seat back 20 which is erected from the seat cushion 40 upward in the vertical direction Z and serves as a backrest for the occupant C2; and a shock absorbing member 23 which absorbs shock inputted from the rear to the seat back 20. The seat back 20 includes a main body 21, a seat skin 30, and a tension relief portion 38.

[0041] like Figure 2As shown, an impact absorbing component 23 is built into the main body 21. The impact absorbing component 23 is a plate-shaped component made of a metal material, and is constructed to be able to undergo plastic deformation due to a load input from the rear. The impact absorbing component 23 is fixed to a metal frame tube 22 that forms a part of the seat frame. In addition, although not specifically shown in the figure, a pad made of a material softer than the seat surface 30 described later (for example, a foamed body such as polyurethane foam) is provided on the periphery of the impact absorbing component 23. In addition, in addition to being a component that absorbs impacts by plastic deformation, the impact absorbing component 23 may also be a component that absorbs impacts by elastic deformation. In such a case, the material of the impact absorbing component 23 is not particularly limited, and various materials can be used.

[0042] The body 21 is covered with a flexible seat cover 30. The seat cover 30 of the present embodiment is composed of a plurality of cover structural elements, including a front surface cover 31 covering the front surface of the body 21, an upper surface cover 32 covering the upper surface of the body 21, a side cover 33 covering the side of the body 21, and a back cover 34 covering the back surface 21a of the body 21. The plurality of cover structural elements are integrated by sewing.

[0043] The material of the seat cover 30 is not particularly limited as long as it is flexible. For example, genuine leather, artificial leather, polyvinyl chloride leather, fabric (cloth), and the like can be used as the material of the seat cover 30 as appropriate.

[0044] 2. Structure of the back cover

[0045] like Figure 2 as well as Figure 3 As shown, the back cover 34 includes a first cover member 35 and a second cover member 36 both of which are sheet-shaped.

[0046] The first cover member 35 is provided on the impact absorbing member 23 (see Figure 3 ) is a covering member for the opening 35a at the rear of the rear seat occupant C3. The opening 35a of the first cover member 35 is used as a cover member for allowing the head H of the rear seat occupant C3 to be Figure 6 Therefore, the size of the opening 35a of the first cover 35 is set to be larger than the head H of the rear seat occupant C3. In addition, the opening 35a also serves as an inspection port for inspecting the main body 21.

[0047] The second cover 36 is a cover member that blocks the opening 35a of the first cover 35 from the rear side. The lower end 36a of the second cover 36 is fixed to the first cover 35. That is, the lower end 36a of the second cover 36 is sewed in a state of being sandwiched between the first cover 35 and the other cover 39. In addition, the upper end 36b of the second cover 36 and the side ends 36c on both sides of the left-right direction Y are attached to the first cover 35 in a detachable manner through the tension relief portion 38. The second cover 36 can also be called a "split cover" that is split from the first cover 35.

[0048] like Figure 2 As shown, a head H (see FIG. 1 ) of the rear seat passenger C3 is set on the back side of the second cover member 36 in the event of a frontal collision of the vehicle 1. Figure 6 The collision assumed area A is set at a position partially overlapping with the opening 35a of the first cover 35 when the second cover 36 is viewed from the rear.

[0049] 3. Structure of the tension relief unit

[0050] The tension relief portion 38 has a function of relieving the tension of the second cover 36 when the head H of the rear seat occupant C3 hits the second cover 36 of the back cover portion 34 from behind. In order to achieve this function, the tension relief portion 38 is configured such that the second cover 36 is detachably mounted on the first cover 35, and the second cover 36 is subjected to a front load F exceeding a reference value (see reference 1 to the reference value) from the head H of the rear seat occupant C3. Figure 6 ), the second cover 36 is separated from the first cover 35, thereby relieving the tension of the second cover 36. That is, when there is no front load F acting on the second cover 36 from the rear or the front load F is lower than a preset value, the tension relieving portion 38 maintains the installation state of the second cover 36 relative to the first cover 35.

[0051] In this embodiment, the tension relief portion 38 is a Velcro tape composed of a detachable portion 38a provided on the first cover 35 and a detachable portion 38b provided on the second cover 36. The Velcro tape is a known structure, which is omitted from the figure and is a detachable tape using a pile structure. A first Velcro structure having a small mushroom-shaped bulge (or hook-shaped bristles) is arranged on the detachable portion 38a, and a second Velcro structure having round bristles is arranged on the detachable portion 38b.

[0052] According to the tension relief portion 38, when the two attachment and detachment portions 38a and 38b are attached, the mushroom-shaped objects (or bristles) of the first Velcro structure are hooked (entangled) on the round hairs of the second Velcro structure, and the installation state is simply adhered together. On the other hand, when the two attachment and detachment portions 38a and 38b are pulled with a load greater than a predetermined value, the mushroom-shaped objects (or bristles) of the first Velcro structure are separated from the entanglement, and the two Velcro structures are separated from each other. Thus, the tension relief portion 38 is configured to repeatedly attach and detach the second cover 36 relative to the first cover 35. In addition, it is also possible to set the attachment and detachment portion 38a on the second cover 36 and the attachment and detachment portion 38b on the first cover 35.

[0053] like Figure 2 as well as Figure 3 As shown, two detachable parts 38a and 38b constituting the tension relief part 38 are provided along the opening edge 35b near the opening edge 35b of the opening part 35a of the first cover member 35. In this embodiment, a plurality of tension relief parts 38 are provided at intervals along the opening edge 35b. Alternatively, all or part of the plurality of tension relief parts 38 may be combined into one.

[0054] like Figure 5 As shown in FIG. 1 , when the second cover 36 is mounted on the first cover 35, the user moves the second cover 36 so that the positions of the two attachment and detachment parts 38a and 38b of each tension relief part 38 are roughly aligned while holding the second cover 36. At this time, the user rotates the second cover 36 with the fixed end, i.e., the lower end 36a, as the center, and the free end, i.e., the upper end 36b, toward the first cover 35. As a result, as shown in FIG. Figure 4 As shown, the second cover member 36 is mounted on the first cover member 35 in a taut state.

[0055] 4. Seat back movement

[0056] Next, refer to Figures 6 to 8 , the operation of the seat back 20 of the seat 12 when the vehicle 1 is involved in a head-on collision will be described.

[0057] like Figure 6 As shown, when the vehicle 1 is subjected to a head-on collision, the rear seat passenger C3 will lean forward due to the reaction. As a result, the head H of the rear seat passenger C3 hits the collision assumption area A of the seat back 20 (see Figure 2 ).like Figure 7As shown, when the second cover 36 of the back cover portion 34 is subjected to a front load F exceeding a reference value from the head H of the rear seat occupant C3, the two mounting and disassembly portions 38a and 38b of the tension relief portion 38 peel off from each other. As a result, the second cover 36 is detached from the first cover 35 with its lower end portion 36a remaining, thereby relieving the tension in the initial state, and is bent in a manner that enters the opening portion 35a of the first cover 35. That is, the stress generated on the second cover 36 is relieved by the tension relief portion 38. Subsequently, the head H of the rear seat occupant C3 enters the opening portion 35a of the first cover 35 and moves toward the impact absorbing component 23. After the head H of the rear seat occupant C3 reaches the impact absorbing component 23, as shown in FIG. Figure 8 As shown, the shock absorbing member 23 absorbs the shock by plastically deforming forward.

[0058] 5. Effect

[0059] Next, the effects of the above-mentioned first embodiment will be described.

[0060] In the seat 12 of the first embodiment, the seat back 20 serving as a backrest has a built-in impact absorbing member 23 in the main body 21 and has a tension relieving portion 38 that relieves the tension of the back cover 34 when the head H of the rear seat occupant C3 hits the back cover 34 from behind. Therefore, according to the seat 12, when the vehicle 1 is subjected to a frontal collision, the influence of the reaction force on the head H of the rear seat occupant C3 due to the tension of the back cover 34 of the seat back 20 can be suppressed to a low level. That is, the head H of the rear seat occupant C3 is not easily restrained by the back cover 34 of the seat back 20. At this time, the impact absorbing member 23 can absorb the impact on the head H of the rear seat occupant C3 without being significantly hindered by the back cover 34, and can exert its original impact absorbing function. As a result, the protection performance of the rear seat occupant C3 seated on the seat 13 behind the seat 12 can be improved.

[0061] As described above, according to the seat 12 of the first embodiment, it is possible to improve the occupant protection performance when the rear seat occupant C3 strikes the seat back 20 in the event of a head-on collision of the vehicle 1 .

[0062] According to the seat 12 of the first embodiment, when the head H of the rear seat occupant C3 hits the second cover 36 of the seat back 20 from behind and the second cover 36 is subjected to a front load F exceeding a reference value, the tension relief portion 38 can release the second cover 36 from the first cover 35 to relieve the tension of the second cover 36. Thereafter, the head H of the rear seat occupant C3 enters the main body 21 through the opening 35a of the first cover 35, and the impact can be absorbed by the impact absorbing member 23 built into the main body 21. In contrast, when the vehicle 1 does not have a frontal collision, or when the front load F applied to the second cover 36 from the head H of the rear seat occupant C3 is equal to or less than the reference value, the tension relief portion 38 maintains the second cover 36 attached to the first cover 35.

[0063] According to the seat 12 of the first embodiment, when the second cover 36 is hit by the head H of the rear seat occupant C3, the lower end portion 36a is moved as a fixed end portion and the upper end portion 36b is moved as a free end portion, and the opening portion 35a of the first cover 35 is opened to allow the head H of the rear seat occupant C3 to enter the main body portion 21 through the opening portion 35a. On the other hand, since the lower end portion 36a of the second cover 36 is always fixed to the first cover 35, the second cover 36 can be easily returned from the open state of the opening portion 35a of the first cover 35 to the closed state.

[0064] According to the seat 12 of the first embodiment, the tension relief portion 38 is configured so that the second cover 36 can be repeatedly attached and detached relative to the first cover 35, so that the second cover 36 temporarily detached from the first cover 35 when the vehicle 1 is subjected to a head-on collision can be easily reattached to the first cover 35. Therefore, the man-hours and costs required for the operation of returning the second cover 36 to the initial state can be suppressed to a low level.

[0065] According to the seat 12 of the first embodiment, by providing the tension relief portion 38 along the opening edge 35b near the opening edge 35b of the opening portion 35a of the first cover 35, the size of the second cover 36 can be set to slightly exceed the size of the opening portion 35a of the first cover 35. Thus, the material cost of the second cover 36 can be suppressed to be low.

[0066] According to the seat 12 of the first embodiment, the opening 35a of the first cover 35 can have a function for inspecting the main body 21 in addition to the function of allowing the head H of the rear seat occupant C3 to enter when the vehicle 1 is in a head-on collision.

[0067] Next, other embodiments related to the above embodiment will be described with reference to the drawings. In other embodiments, the same elements as those of the above embodiment are denoted by the same reference numerals, and description of the same elements is omitted.

[0068] Implementation Method 2

[0069] like Fig. 9 As shown in FIG. 1 , the seat 12 of the second embodiment includes a seat back 20A having a different structure from that of the first embodiment. That is, the back cover 34A of the seat back 20A is different from the back cover 34 of the first embodiment in that a sheet-like third cover 37 is provided in addition to the first cover 35 and the second cover 36. The third cover 37 is provided so as to cover the upper end 36b of the second cover 36.

[0070] like Fig.11 As shown, when the second cover 36 is mounted on the first cover 35, the user moves the two mounting and dismounting parts 38a and 38b of each tension relief part 38 in a state of holding the second cover 36 so that the positions are roughly the same. At this time, the user rotates the second cover 36 with the fixed end, i.e., the lower end 36a, as the center, so that the free end, i.e., the upper end 36b, is toward the first cover 35, and inserts the upper end 36b of the second cover 36 into the gap 37a between the first cover 35 and the third cover 37. As a result, as shown in FIG. Fig.10 As shown, the second cover member 36 is mounted on the first cover member 35 in a tight state, and the upper end portion 36b of the second cover member 36 is covered by the third cover member 37 in a manner not visible from the outside.

[0071] The other structures and operations are the same as those in the first embodiment.

[0072] According to the seat 12 of the second embodiment, the third cover 37 can prevent the upper end portion 36 b of the second cover 36 , which is attached to the first cover 35 , from being exposed to deteriorate the appearance.

[0073] Otherwise, the same effects as those of the first embodiment are achieved.

[0074] In a modification particularly related to Embodiment 2, the side end 36c of the second cover 36 may be covered with another cover in addition to the upper end 36b of the second cover 36. This improves the effect of preventing the appearance of the second cover 36 attached to the first cover from being deteriorated.

[0075] The present invention is not limited to the above-mentioned typical embodiments, and various applications and modifications are conceivable without departing from the purpose of the present invention. For example, the following embodiments can be implemented by applying the above-mentioned embodiments.

[0076] Although the above embodiment exemplifies the case where the tension relief part 38 is a Velcro tape, the tension relief part 38 is not limited to the Velcro tape. For example, the tension relief part may be formed by a joining method such as sewing or bonding, and the second cover 36 may be detachably attached to the first cover 35.

[0077] Although the above method illustrates a structure in which the second cover 36 is detached from the first cover 35 with its lower end portion 36a remaining when the vehicle 1 is involved in a head-on collision, a structure in which the second cover 36 is completely detached from the first cover 35 as a whole when the vehicle 1 is involved in a head-on collision may be used instead.

[0078] In the above embodiment, the number of covers in the back cover portion 34 , 34A is two or three, but the number of covers is not limited thereto and may be one or four or more as needed.

Claims

1. A vehicle seat, which is arranged on a vehicle, characterized in that: include: The seat back that becomes a reclining seat; an impact absorbing member for absorbing the impact inputted to the seat back from the rear, The seat back includes a main body portion in which the impact absorbing member is built, a back cover portion covering a back surface of the main body portion, and a tension relief portion for relieving tension on the back cover portion when a rear seat occupant's head hits the back cover portion from behind.

2. The vehicle seat according to claim 1, wherein: The back cover includes a first cover member and a second cover member, the first cover member having an opening portion arranged at the rear of the impact absorbing member in a manner that allows the head of the rear seat occupant to enter, and the second cover member closing the opening portion of the first cover member from the rear side. The tension relief portion is configured to attach the second cover to the first cover in a detachable manner, and to detach the second cover from the first cover when the second cover receives a front load exceeding a reference value from the head of the rear seat occupant, thereby relieving tension in the second cover.

3. The vehicle seat according to claim 2, wherein: The lower end portion of the second cover member is fixed to the first cover member, and the upper end portion and the side end portion of the second cover member are detachably mounted on the first cover member via the tension relief portion.

4. The vehicle seat according to claim 2 or 3, wherein: The tension relief portion is configured to allow the second cover member to be repeatedly attached to and detached from the first cover member.

5. The vehicle seat according to claim 2 or 3, wherein: The tension relief portion is provided in the vicinity of an opening edge of the opening portion of the first cover member along the opening edge.

6. The vehicle seat according to claim 2 or 3, wherein: The back surface cover includes a third cover member that covers at least an upper end portion of the second cover member.

7. The vehicle seat according to claim 2 or 3, wherein: The opening of the first cover also serves as an inspection port for inspecting the main body.

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