Vehicle seat

Abstract

To inhibit a seated person from sliding forward when a vehicle is decelerated.SOLUTION: One embodiment of the present disclosure is a vehicle seat to be mounted in a vehicle. The vehicle seat includes a seat cushion 3. The seat cushion 3 is so formed as to have higher stiffness at a position closer to the front side of the vehicle in a buttocks-supporting seat surface 21a supporting the buttocks of a seated person on the vehicle seat. The seat cushion 3 may include a cushion pad 21 including the buttocks-supporting seat surface 21a; and a support member 23 supporting the cushion pad 21 at a position below the buttocks-supporting seat surface 21a. The support member 23 may be a spring member 23 which is so formed as to have a greater spring constant at a position closer to the front side of the vehicle.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a vehicle seat mounted on a vehicle.

Background Art

[0002] Patent Document 1 describes a vehicle seat including a support member that is mounted in a bridging manner in the front-rear direction of the seat within a seat frame and supports a seat pad.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There has been a problem that the heavier the weight of the occupant of the vehicle seat, the easier it is for the occupant to slide forward when the vehicle decelerates. An object of the present disclosure is to suppress the forward sliding of the occupant when the vehicle decelerates.

Means for Solving the Problems

[0005] One aspect of the present disclosure is a vehicle seat (1) mounted on a vehicle, including a seat cushion (3). The seat cushion (3) is formed such that the rigidity increases as it is located closer to the front side of the vehicle on a hip support seating surface (21a) that supports the hips of an occupant sitting on the vehicle seat (1).

[0006] The vehicle seat (1) of the present disclosure configured as described above can increase the front-rear support reaction force acting on the occupant when sitting on the vehicle seat as the weight of the occupant increases, and thus can suppress the forward sliding of the occupant when the vehicle decelerates.

[0007] In one aspect of the present disclosure, the seat cushion (3) may include a cushion pad (21) including a hip support seating surface (21a) and a support member (23) that supports the cushion pad (21) below the hip support seating surface (21a). The support member (23) may be a spring member (23) formed such that the spring constant increases as it is located closer to the front side of the vehicle.

[0008] In the vehicle seat (1) of the present disclosure configured as described above, in the spring member (23), by changing the spring constant of the spring member (23) according to the position facing the hip support seating surface (21a), the rigidity of the seat cushion (3) can be changed according to the position of the hip support seating surface (21a).

[0009] Note that the reference numerals in each of the above parentheses are examples showing the correspondence with the specific configurations and the like described in the embodiments to be described later, and the present disclosure is not limited to the specific configurations and the like indicated by the reference numerals in the above parentheses.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [1. First Embodiment] [1-1. Configuration of Vehicle Seat] The vehicle seat 1 of the present embodiment is mounted on a vehicle and includes, as shown in FIG. 1, a seat cushion 3 and a seat back 5. The seat cushion 3 is a part for supporting the hips of the seated person. The seat back 5 is a part for supporting the back of the seated person.

[0012] The vehicle seat 1 of this embodiment is used as a seat for a passenger car. In the following description and in each drawing, the directions refer to the directions in the state where the vehicle seat 1 is assembled to a vehicle (i.e., a passenger car). Also, in this embodiment, the seat width direction coincides with the left - right direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

[0013] The seat cushion 3 includes a pair of left - and - right side frames 7, a front panel 9, a front pipe 11, and a rear pipe 13. The front panel 9 bridges the front ends of the pair of left - and - right side frames 7. The front panel 9 supports the thighs of the seated occupant from below.

[0014] The front pipe 11 and the rear pipe 13 are made of metal round pipe materials. The front pipe 11 and the rear pipe 13 bridge the pair of left - and - right side frames 7. The front pipe 11 is installed behind the front panel 9. The rear pipe 13 is installed further behind the front pipe 11 and bridges the vicinity of the rear ends of the pair of left - and - right side frames 7.

[0015] As shown in FIG. 2, the seat cushion 3 further includes a cushion pad 21 and a plurality of S - springs 23. The cushion pad 21 is formed of an elastic resin (e.g., urethane, etc.).

[0016] The cushion pad 21 includes, along the front - rear direction of the vehicle, a hip - support seating surface 21a that mainly supports the hips of the seated person from below and a thigh - support seating surface 21b that mainly supports the thighs of the seated person from below, in order from the rear side.

[0017] The thickness PT1 of the cushion pad 21 at the hip - support seating surface 21a is constant regardless of the position of the hip - support seating surface 21a. A plurality of S springs 23 are spanned between the front pipe 11 and the rear pipe 13 below the cushion pad 21, and support a portion of the cushion pad 21 corresponding to the hip support seating surface 21a.

[0018] [1-2.Structure of S spring] As shown in FIG. 3, each of the plurality of S springs 23 is a spring formed in a rectangular wave shape with a plurality of bent portions. Note that the S spring 23 may be a spring formed in a sine wave shape with a plurality of curved portions.

[0019] The S spring 23 is formed by connecting a plurality of straight portions 41 and a plurality of convex portions 43 such that one straight portion 41 and one convex portion 43 are alternately arranged along the longitudinal direction of the vehicle.

[0020] The S spring 23 is formed such that the interval D1 between the convex portions 43a arranged at the frontmost side of the vehicle is wider than the interval D2 between the convex portions 43b adjacent to the convex portions 43a at the rear side of the vehicle. Further, the S spring 23 is formed such that the interval D2 between the convex portions 43b is wider than the interval D3 between the convex portions 43c adjacent to the convex portions 43b at the rear side of the vehicle. Note that the interval between the convex portions 43 in the present embodiment is the length of the convex portion 43 along the longitudinal direction of the vehicle. Thereby, the spring constant of the S spring 23 at the front side of the vehicle is larger than the spring constant at the rear side of the vehicle. That is, the closer to the front side of the vehicle, the higher the rigidity at the hip support seating surface 21a of the cushion pad 21.

[0021] [1-3.Front and rear support reaction forces] As shown in FIG. 4, depending on the size of the pelvis of the seated person (i.e., the build of the seated person), the position where the ischium contacts the hip support seating surface 21a of the cushion pad 21 varies.

[0022] When a seated person having the largest pelvis PL1 among the three pelvises PL1, PL2, and PL3 shown in FIG. 4 sits on the vehicle seat 1, the ischium of the pelvis PL1 is located at point P1. When a seated person having the second largest pelvis PL2 sits on the vehicle seat 1, the ischium of the pelvis PL2 is located at point P2. When a seated person having the third largest pelvis PL3 sits on the vehicle seat 1, the ischium of the pelvis PL3 is located at point P3.

[0023] Thus, the larger the pelvis of the seated person, the more the position of the ischium of the seated person moves to the front side of the vehicle. Since the thickness PT1 of the cushion pad 21 on the hip support seat surface 21a is constant regardless of the position of the hip support seat surface 21a, as shown in FIG. 4, the elongation k1 of the S spring 23 when a seated person having the pelvis PL1 sits on the vehicle seat 1, the elongation k2 of the S spring 23 when a seated person having the pelvis PL2 sits on the vehicle seat 1, and the elongation k3 of the S spring 23 when a seated person having the pelvis PL3 sits on the vehicle seat 1 are the same.

[0024] And, as described above, the S spring 23 has a spring constant that becomes larger as it is located closer to the front side of the vehicle. Therefore, the front-rear support reaction force F1 acting on the ischium of the seated person when a seated person having the pelvis PL1 sits on the vehicle seat 1 is larger than the front-rear support reaction force F2 acting on the ischium of the seated person when a seated person having the pelvis PL2 sits on the vehicle seat 1. Similarly, the front-rear support reaction force F2 is larger than the front-rear support reaction force F3 acting on the ischium of the seated person when a seated person having the pelvis PL3 sits on the vehicle seat 1. The front-rear support reaction force is a force that acts toward the rear of the vehicle along the front-rear direction of the vehicle.

[0025] Generally, the larger the pelvis of a person with a heavier weight, so the heavier the weight of the seated person on the vehicle seat, the more the buttocks of the seated person contact the seat cushion 3 on the front side of the hip support seat surface 21a. As a result, the heavier the weight of the seated person, the greater the front-rear support reaction force acting on the seated person when sitting on the vehicle seat 1.

[0026] [1-4. Effect] According to the embodiments described in detail above, the following effects can be obtained. (1a) As the weight of the occupant increases, the vehicle seat 1 can increase the front and rear support reaction forces acting on the occupant when sitting on the vehicle seat 1, so that the forward sliding of the occupant during deceleration of the vehicle can be suppressed.

[0027] (1b) In the vehicle seat 1, in the S spring 23, by changing the spring constant of the S spring 23 according to the position facing the hip support seat surface 21a, the rigidity of the seat cushion 3 can be changed according to the position of the hip support seat surface 21a.

[0028] [1-5. Corresponding relationships of expressions] In the embodiments described above, the S spring 23 corresponds to the support member and the spring member. [2. Other embodiments] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment and can be implemented with various modifications.

[0029] (2a) In the above embodiment, the form in which the S spring 23 supports the cushion pad 21 is shown. However, the support member that supports the cushion pad 21 is not limited to the S spring and may be, for example, a pan frame.

[0030] (2b) In the above embodiment, the form in which the rigidity of the seat cushion 3 is changed by changing the interval between the plurality of convex portions 43 of the S spring 23 is shown. However, the rigidity may be changed by a method other than changing the interval between the plurality of convex portions 43 of the S spring 23.

[0031] (2c) The multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Also, the multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of another of the above embodiments.

Explanation of Signs

[0032] 1…Vehicle seat, 3…Seat cushion, 21a…Hip support seating surface

Claims

1. A vehicle seat mounted on a vehicle, the vehicle seat comprising a seat cushion formed such that the rigidity thereof increases as the seat cushion approaches the front side of the vehicle, the seat cushion supporting the buttocks of a seated person sitting on the vehicle seat.

2. The vehicle seat according to claim 1, wherein the seat cushion comprises a cushion pad including the buttocks support seating surface, and a support member supporting the cushion pad below the buttocks support seating surface, wherein the support member is a spring member formed such that the spring constant thereof increases as the support member approaches the front side of the vehicle.

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