Vehicle seat

Abstract

To suppress rattling of a tilt down mechanism.SOLUTION: The vehicle seat 10 is equipped with the seat cushion 12, which has the pair of right and left side frames 22 and the cushion pipe 26 that spans between the pair of right and left side frames 22 and supports the buttocks of a seated occupant from the seat lower side, and the seat back 14, which supports the back of the seated occupant from the seat rear side. Furthermore, the vehicle seat 10 is equipped with the tilt down mechanism 16 that displaces the seat cushion 12 in the seat downward direction by tilting the seat back 14 in the seat forward direction and the cushion pipe interference portion 44 with which part of the cushion pipe 26 interferes, and the cushion pipe 26 is bent as a result of part of the cushion pipe 26 interfering with the cushion pipe interference portion 44.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Patent Document 1 below discloses a vehicle seat equipped with a tilt-down mechanism. In the vehicle seat described in this document, when the seat back is tilted forward and folded, the seat cushion is displaced forward and downward. This allows the seat back to be folded and stored with the seat back and seat cushion stacked vertically. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-066248 Summary of the Invention [Problem to be solved by the invention]

[0004] In a vehicle seat equipped with a tilt-down mechanism, it is desirable to be able to suppress rattle of the tilt-down mechanism when no load is applied or when a passenger is seated.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a vehicle seat that can suppress rattle of a tilt-down mechanism. [Means for solving the problem]

[0006] The vehicle seat of the first aspect has a pair of left and right side frames and a cushion pipe suspended between the pair of left and right side frames, and is equipped with a seat cushion that supports the buttocks of a seated occupant from below the seat, a seat back that supports the back of the seated occupant from the rear side of the seat, a tilt-down mechanism that displaces the seat cushion toward the lower side of the seat by tilting the seat back toward the front side of the seat, and a cushion pipe interference portion with which a portion of the cushion pipe interferes, and the cushion pipe is bent due to the portion of the cushion pipe interfering with the cushion pipe interference portion.

[0007] In the vehicle seat of the first aspect, the tilt-down mechanism allows the seat cushion to be displaced downward when the seat back is tilted toward the front of the seat. Here, a portion of the cushion pipe interferes with the cushion pipe interference portion, causing the cushion pipe to bend. As a result, a biasing force (a biasing force caused by the bending of the cushion pipe) is input from another portion of the cushion pipe to the tilt-down mechanism via a pair of left and right side frames. By inputting this biasing force to the tilt-down mechanism, rattle of the tilt-down mechanism can be suppressed.

[0008] The vehicle seat of the second aspect is the vehicle seat of the first aspect, in which an engagement recess that is open on the upper side of the seat is formed in the cushion pipe interference portion, and when a load from an occupant seated on the seat cushion is input to the cushion pipe, the cushion pipe bends, and a portion of the cushion pipe is positioned within the engagement recess, and a portion of the cushion pipe is supported within the engagement recess.

[0009] In the vehicle seat of the second aspect, when a load from an occupant seated on the seat cushion is input to the cushion pipe, the cushion pipe bends and a portion of the cushion pipe is positioned within the engagement recess. This causes a portion of the cushion pipe to be supported within the engagement recess. While a portion of the cushion pipe is supported within the engagement recess, a biasing force caused by the cushion pipe bending due to the load from the occupant is input to the tilt-down mechanism. This makes it possible to suppress rattle of the tilt-down mechanism when the occupant is seated. [Effects of the Invention]

[0010] The vehicle seat according to the present invention has the excellent effect of being able to suppress rattle of the tilt-down mechanism. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view of a vehicle seat according to an embodiment of the present invention, viewed from the left side. [Figure 2] FIG. 2 is a perspective view of the cushion frame and the like, seen from diagonally above. [Figure 3] FIG. 10 is a side view of the cushion pipe interference portion and the like as viewed from the left side. DETAILED DESCRIPTION OF THE INVENTION

[0012] 1 to 3, a vehicle seat 10 according to an embodiment of the present invention will be described. In the drawings, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, the arrow LH indicates the left side in the seat width direction, and the arrow RH indicates the right side in the seat width direction. In the following description, unless otherwise specified, when referring to front-rear, up-down, and left-right directions, these refer to front-rear in the seat front-rear direction, up-down in the seat up-down direction, and left-right in the seat width direction.

[0013] 1, the vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks of a seated occupant from below, and a seat back 14 that supports the back of the seated occupant from behind. The vehicle seat 10 also includes a tilt-down mechanism 16 that tilts the seat back 14 forward to displace the seat cushion 12 downward.

[0014] As shown in FIGS. 1 and 2, the seat cushion 12 includes a cushion frame 18 that forms the framework of the seat cushion 12, and a cushion pad 20 attached to the cushion frame 18.

[0015] The cushion frame 18 includes a pair of left and right side frames 22 that are spaced apart in the left-right direction and extend in the front-rear direction, and a front connection portion 24 that spans between the pair of left and right side frames 22 and connects the front ends of the pair of left and right side frames 22 in the left-right direction. The cushion frame 18 also includes a cushion pipe 26 that spans between the pair of left and right side frames 22 and connects the intermediate portions of the pair of left and right side frames 22 in the front-rear direction in the left-right direction.

[0016] The cushion pipe 26 is formed, for example, by bending a cylindrical steel material. The cushion pipe 26 includes a first extending portion 26A extending in the left-right direction and a pair of left and right second extending portions 26B extending forward from both left and right ends of the first extending portion 26A. The cushion pipe 26 also includes a pair of left and right third extending portions 26C extending outward in the seat width direction from ends of the pair of left and right second extending portions 26B opposite the first extending portion 26A. Ends of the pair of left and right third extending portions 26C opposite the second extending portions 26B are joined by welding or the like to central portions of the pair of left and right side frames 22 in the front-rear direction. One of the plurality of cushion springs 28 is attached to the pair of left and right second extending portions 26B of the cushion pipe 26.

[0017] The seat back 14 is configured to include a back frame 30 that forms the framework of the seat back 14 and a back pad 32 attached to the back frame 30.

[0018] The back frame 30 includes a pair of left and right side frames 34 that are spaced apart in the left-right direction and extend in the up-down direction. Lower ends of the pair of left and right side frames 34 are supported by a pair of left and right rear brackets 36 that are spaced apart in the left-right direction so as to be rotatable about an axial direction that is the left-right direction. The pair of left and right rear brackets 36 are also fixed to the upper rail of a seat slide rail 38. Furthermore, rear portions of the pair of left and right rear brackets 36 are connected in the left-right direction via a rear connecting member 40, and front portions of the pair of left and right rear brackets 36 are connected in the left-right direction via a front connecting member 42.

[0019] A pair of left and right cushion pipe interference portions 44, spaced apart in the left-right direction, are fixed to the rear connecting member 40 via brackets 46. As shown in FIGS. 2 and 3 , the cushion pipe interference portion 44 includes a rear wall portion 44A extending in the up-down direction, a bottom wall portion 44B serving as a lower support portion extending forward from the lower end of the rear wall portion 44A, and a front wall portion 44C extending upward from the front end of the bottom wall portion 44B. The vertical dimension of the rear wall portion 44A is set to be larger than the vertical dimension of the front wall portion 44C. An engagement recess 44D, the upper side of which is open, is formed by the front wall portion 44C, the bottom wall portion 44B, and a lower portion 44A1 of the rear wall portion 44A. The pair of left and right cushion pipe interference portions 44 are adapted to interfere with the first extension portion 26A of the cushion pipe 26. More specifically, the first extending portion 26A of the cushion pipe 26 interferes with the front surface of the upper portion 44A2 of the rear wall portion 44A. Furthermore, when the first extending portion 26A of the cushion pipe 26 interferes with the front surface of the upper portion 44A2 of the rear wall portion 44A, the cushion pipe 26 is bent in the front-rear direction. More specifically, when the first extending portion 26A of the cushion pipe 26 interferes with the front surface of the upper portion 44A2 of the rear wall portion 44A, the first extending portion 26A of the cushion pipe 26 is displaced from position P1 to position P2, and the ranges between the first extending portion 26A and the pair of left and right third extending portions 26C are bent in the front-rear direction.

[0020] As shown in Figures 1 and 2, the tilt-down mechanism 16 is configured to include a pair of left and right front links 48, a pair of left and right first rear links 50, and a pair of left and right second rear links 52.

[0021] The pair of left and right front links 48 are formed in a shape whose longitudinal direction is the up-down direction in a side view of the seat. The lower ends of the pair of left and right front links 48 are supported by a pair of left and right front brackets 54 arranged at a distance in the left-right direction so as to be rotatable about an axial direction in the left-right direction. The pair of left and right front brackets 54 are also fixed to the upper rail of the seat slide rail 38. The upper ends of the pair of left and right front links 48 are each connected to the front end side of the cushion frame 18 so as to be rotatable about an axial direction in the left-right direction.

[0022] The pair of left and right first rear links 50 are formed in a shape whose longitudinal direction is the up-down direction in a side view of the seat. The lower end portions of the pair of left and right first rear links 50 are supported by the pair of left and right rear brackets 36 so as to be rotatable about the left-right direction as an axial direction. The upper end portions of the pair of left and right first rear links 50 are connected to the rear end portions of the pair of left and right side frames 22 so as to be rotatable about the left-right direction as an axial direction.

[0023] The pair of left and right second rear links 52 are formed in a shape whose longitudinal direction is the up-down direction in a side view of the seat. The lower ends of the pair of left and right second rear links 52 are respectively connected to the rear ends of the pair of left and right side frames 22 rearward of the upper ends of the pair of left and right first rear links 50 so as to be rotatable about their axial directions in the left-right direction. In addition, the upper ends of the pair of left and right second rear links 52 are respectively connected to the pair of left and right side frames 34 so as to be rotatable about their axial directions in the left-right direction.

[0024] 2, the pair of left and right side frames 22 are each provided with abutment portions 22A against which the pair of left and right second rear links 52 abut. When the pair of left and right second rear links 52 abut against the abutment portions 22A, the rotation of the pair of left and right second rear links 52 relative to the pair of left and right side frames 22 is restricted.

[0025] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0026] As shown in FIGS. 1 and 2 , in the vehicle seat 10 of this embodiment, the seat back 14 can be tilted forward by operating an operating unit (not shown). When the seat back 14 is tilted forward with the pair of left and right second rear links 52 abutting against the abutment portions 22A, the pair of left and right front links 48 and the pair of left and right first rear links 50 tilt forward. As a result, the cushion frame 18, to which the pair of left and right front links 48 and the pair of left and right first rear links 50 are connected, is displaced downward while being displaced forward. As a result, the seat cushion 12 is displaced downward while being displaced forward. Furthermore, in this embodiment, the seat back 14 and the seat cushion 12, which have been tilted forward, can be stored in a state where they are stacked vertically.

[0027] 2 and 3, when the first extending portion 26A of the cushion pipe 26 interferes with the front surface of the upper portion 44A2 of the rear wall portion 44A of the cushion pipe interference portion 44, the cushion pipe 26 is bent in the front-rear direction. As a result, a biasing force due to this bending is input from the pair of left and right third extending portions 26C of the cushion pipe 26 to the tilt-down mechanism 16 via the pair of left and right side frames 22. By inputting this biasing force to the tilt-down mechanism 16, rattle of the tilt-down mechanism 16 can be suppressed. In particular, rattle of the rotating portions of each link (the pair of left and right front links 48, the pair of left and right first rear links 50, and the pair of left and right second rear links 52) can be suppressed.

[0028] Furthermore, in the vehicle seat 10 of this embodiment, when a load from an occupant seated on the seat cushion 12 is input to the cushion pipe 26, the cushion pipe 26 bends such that the first extending portion 26A is displaced downward relative to the pair of left and right third extending portions 26C. As a result, the first extending portion 26A of the cushion pipe 26 is disposed in the engaging recess 44D of the cushion pipe interference portion 44 and contacts the lower portions 44A1 of the front wall portion 44C, the bottom wall portion 44B, and the rear wall portion 44A (i.e., the first extending portion 26A of the cushion pipe 26 is located at position P3 shown in FIG. 3). As a result, the first extending portion 26A of the cushion pipe 26 is supported from the front side, below side, and rear side by the lower portions 44A1 of the front wall portion 44C, the bottom wall portion 44B, and the rear wall portion 44A. Here, when the first extending portion 26A of the cushion pipe 26 is supported within the engaging recess 44D, the biasing force caused by the bending of the cushion pipe 26 due to the load from the occupant is input to the tilt-down mechanism 16. This makes it possible to suppress rattling of the tilt-down mechanism 16 when the occupant is seated.

[0029] In the present embodiment, an example has been described in which, when a load from an occupant seated on the seat cushion 12 is input to the cushion pipe 26, the cushion pipe 26 bends in response to the load from the occupant, and a portion of the cushion pipe 26 is supported within the engagement recess 44D. However, the present invention is not limited to this. For example, a configuration in which the load from the occupant seated on the seat cushion 12 is not input to the cushion pipe 26 may also be employed.

[0030] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0031] 10 Vehicle seats 12 seat cushions 14 Seat back 16 Tilt down mechanism 22 Side frame 26 Cushion pipe 44 Cushion pipe interference part 44D Engagement recess

Claims

1. a seat cushion having a pair of left and right side frames and a cushion pipe stretched across the pair of left and right side frames, the seat cushion supporting the buttocks of a seated occupant from below the seat; a seat back that supports the back of a seated occupant from the rear side of the seat; a tilt-down mechanism that tilts the seat back toward the front of the seat to displace the seat cushion toward a lower side of the seat; a cushion pipe interference portion with which a part of the cushion pipe interferes; Equipped with A portion of the cushion pipe interferes with the cushion pipe interference portion, causing the cushion pipe to bend.

2. The cushion pipe interference portion has an engagement recess formed therein, the engagement recess being open on the upper side of the seat, 2. The vehicle seat according to claim 1, wherein a load from an occupant seated on the seat cushion is input to the cushion pipe, causing the cushion pipe to bend, so that a portion of the cushion pipe is positioned within the engagement recess and is supported within the engagement recess.

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