Vehicle seat

Abstract

The present disclosure provides a vehicle seat that suppresses forward sliding of a seated person when a vehicle is decelerated. A seat cushion provided in a vehicle seat of the present disclosure is formed so that the rigidity thereof is higher as the seat cushion is positioned in front of a vehicle at a hip support seat surface that supports the hip of a seated person seated in the vehicle seat.

Description

Technical Field

[0001] The present disclosure relates to a vehicle seat installed in a vehicle. Background Art

[0002] In the vehicle seat described in Japanese Unexamined Patent Application Publication No. 2015-67170, it includes a support member that is installed in a seat frame so as to bridge in the front-rear direction of the seat and supports a seat cushion. Summary of the Invention

[0003] In a vehicle, there is a problem that the heavier the weight of a passenger sitting on a vehicle seat, the more likely the passenger is to slide forward when the vehicle decelerates.

[0004] One aspect of the present disclosure aims to suppress the forward sliding of a passenger when the vehicle decelerates.

[0005] One embodiment of the present disclosure is a vehicle seat installed in a vehicle, which includes a seat cushion. The seat cushion is configured such that at a hip support seat surface that supports the hip of a passenger sitting on the vehicle seat, the stiffness of the seat cushion is higher as it is located more towards the front side of the vehicle.

[0006] According to the vehicle seat of the present disclosure configured as described above, since the heavier the weight of the passenger, the greater the front-rear support reaction force acting on the passenger when sitting on the vehicle seat, it is possible to suppress the forward sliding of the passenger when the vehicle decelerates.

[0007] In one embodiment of the present disclosure, the seat cushion may include a cushion pad and a support member. The cushion pad includes a hip support seat surface, and the support member supports the cushion pad below the hip support seat surface. The support member may be a spring member, and the spring constant of the spring member is larger as it is located more towards the front side of the vehicle.

[0008] According to the vehicle seat of the present disclosure configured as described above, by changing the spring constant of the spring member according to the position facing the hip support seat surface in the spring member, it is possible to change the stiffness of the seat cushion according to the position of the hip support seat surface. Brief Description of the Drawings

[0009] Figure 1 is a perspective view showing the configuration of a vehicle seat.

[0010] Figure 2 is a cross-sectional view showing a cushion pad supported by an S-shaped spring.

[0011] Figure 3 is a top view showing the configuration of an S-shaped spring.

[0012] Figure 4 This is a diagram showing the front and rear support reaction forces. Detailed implementation manners

[0013] The following describes the implementation manners of the present disclosure with reference to the accompanying drawings.

[0014] [1. First implementation manner]

[0015] [1-1. Structure of a vehicle seat]

[0016] The vehicle seat 1 of the present implementation manner is installed in a vehicle and, as Figure 1 shown, has a seat cushion 3 and a seat backrest 5. The seat cushion 3 is a part for supporting the buttocks of the seated person. The seat backrest 5 is a part for supporting the back of the seated person.

[0017] The vehicle seat 1 of the present implementation manner is used as a seat for a passenger car. In addition, the directions in the following descriptions and in the respective drawings represent the directions in the state where the vehicle seat 1 is assembled into the vehicle. Further, in the present implementation manner, 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.

[0018] The seat cushion 3 has two side frames 7a, 7b, a front panel 9, a front tube 11, and a rear tube 13.

[0019] The front panel 9 connects the front end portions of the two side frames 7a, 7b to each other. The front panel 9 supports the thighs of the occupant from below.

[0020] The front tube 11 and the rear tube 13 are formed of a round tube material made of metal. The front tube 11 and the rear tube 13 connect the two side frames 7a, 7b to each other. The front tube 11 is located at a position behind the front panel 9. The rear tube 13 is provided at a position further behind the front tube 11 and connects the vicinity of the rear ends of the two side frames 7a, 7b to each other.

[0021] As Figure 2 shown, the seat cushion 3 further includes a cushion pad 21 and a plurality of S-shaped springs 23. The cushion pad 21 is formed of an elastic resin (such as polyurethane, etc.).

[0022] The cushion pad 21 has a buttock support seat surface 21a and a thigh support seat surface 21b. Among them, the buttock support seat surface 21a mainly supports the buttocks of the seated person from below, and the thigh support seat surface 21b mainly supports the thighs of the seated person from below.

[0023] The thickness PT1 of the seat cushion pad 21 at the hip support seat surface 21a is fixed and independent of the position of the hip support seat surface 21a. A plurality of S-shaped springs 23 are hung between the front tube 11 and the rear tube 13 below the seat cushion pad 21 and support the portion of the seat cushion pad 21 corresponding to the hip support seat surface 21a.

[0024] [1-2. Structure of S-shaped spring]

[0025] As Figure 3 shown, each of the plurality of S-shaped springs 23 is a spring formed in a rectangular wave shape and has a plurality of bent portions. The S-shaped spring 23 may be a spring formed in a sine wave shape and have a plurality of curved portions.

[0026] The S-shaped spring 23 is formed by connecting (continuously) a plurality of straight portions 41 and a plurality of convex portions 43 in such a manner that the straight portions 41 and the convex portions 43 are arranged alternately along the front-rear direction of the vehicle.

[0027] The lengths of the plurality of straight portions 41 are different from each other. The intervals (lengths) of the plurality of convex portions 43 are different from each other.

[0028] The S-shaped spring 23 is formed such that the interval D1 of the convex portion 43a disposed at the foremost side of the vehicle is wider than the interval D2 of the convex portion 43b adjacent to the convex portion 43a at the rear side of the vehicle. In addition, the S-shaped spring 23 is formed such that the interval D2 of the convex portion 43b is wider than the interval D3 of the convex portion 43c adjacent to the convex portion 43b at the rear side of the vehicle. The interval of the convex portion 43 in the present embodiment can also be understood as the length of the convex portion 43 in the vehicle front-rear direction.

[0029] By configuring the intervals (lengths) of the convex portions 43 as described above, in the S-shaped spring 23, the spring constant on the front side of the vehicle is greater than the spring constant on the rear side of the vehicle. That is, in the hip support seat surface 21a of the seat cushion pad 21, the higher the stiffness, the more forward it is located on the vehicle.

[0030] The length of the straight portion 41a between the convex portion 43a and the convex portion 43b is longer than the length of the straight portion 41b between the convex portion 43b and the convex portion 43c. The adjacent convex portion 43a and the straight portion 41a may have the same interval (length). That is, D1 and d1 may have the same length. On the other hand, D1 and d1 may also have different lengths. Similarly, for example, D2 and d2 may have the same length. On the other hand, D2 and d2 may also have different lengths.

[0031] The height (projection amount) h1 of the convex portion 43a, the height (projection amount) h2 of the convex portion 43b, and the height (projection amount) h3 of the convex portion 43c are the same. h1, h2, and h3 may also be different. h1 and D1 may be the same. h1 and D1 may also be different. h2 and D2 may be the same. h2 and D2 may also be different. h3 and D3 may be the same. h3 and D3 may also be different.

[0032] [1-3. Front and rear support reaction forces]

[0033] As Figure 4 shown, the pelvic size of the seated person (in other words, the physical size of the seated person) causes the position where the ischium contacts the hip support seat surface 21a of the seat cushion pad 21 to change.

[0034] When a seated person with the largest pelvis PL1 among the three pelves PL1, PL2, and PL3 shown in Figure 4 sits on the vehicle seat 1, the ischium of the pelvis PL1 is located at point P1. When a seated person with 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 with the third largest pelvis PL3 sits on the vehicle seat 1, the ischium of the pelvis PL3 is located at point P3.

[0035] As described above, the larger the pelvis of the seated person, the more the ischium position of the seated person moves toward the front side of the vehicle.

[0036] The thickness PT1 of the seat cushion pad 21 at the hip support seat surface 21a is fixed and unchanged regardless of the position of the hip support seat surface 21a. Therefore, as Figure 4 shown, the elongation amounts k1, k2, and k3 of the S-shaped spring 23 are the same.

[0037] The elongation amount k1 is the elongation amount of the S-shaped spring 23 when a seated person with the pelvis PL1 sits on the vehicle seat 1. The elongation amount k2 is the elongation amount of the S-shaped spring 23 when a seated person with the pelvis PL2 sits on the vehicle seat 1. The elongation amount k3 is the elongation amount of the S-shaped spring 23 when a seated person with the pelvis PL3 sits on the vehicle seat 1.

[0038] Moreover, as described above, in the S-shaped spring 23, the closer it is to the front side of the vehicle, the greater the spring constant. Therefore, the force F1 is greater than the force F2. Similarly, the force F2 is greater than the force F3.

[0039] The force F1 is the front - rear support reaction force acting on the ischium of a seated person with pelvis PL1 when sitting on the vehicle seat 1. The force F2 is the front - rear support reaction force acting on the ischium of a seated person with pelvis PL2 when sitting on the vehicle seat 1. The force F3 is the front - rear support reaction force acting on the ischium of a seated person with pelvis PL3 when sitting on the vehicle seat 1. The front - rear support reaction force is a force acting in the rear direction of the vehicle along the front - rear direction of the vehicle.

[0040] Generally speaking, the heavier a person's weight, the larger their pelvis. Therefore, the heavier the weight of the seated person sitting on the vehicle seat, the more forward the buttocks of the seated person contact the seat cushion 3 on the front side of the buttocks support seat surface 21a. Thus, 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.

[0041] [1 - 4. Effects]

[0042] According to the embodiments described in detail above, the following effects can be obtained.

[0043] (1a) 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. Therefore, the vehicle seat 1 can inhibit the seated person from sliding forward when the vehicle decelerates.

[0044] (1b) The spring constants of the S - shaped springs 23 are not uniform, and the spring constants are different at different positions. Therefore, the stiffness of the seat cushion 3 varies with the different spring constants of the S - shaped springs 23.

[0045] [1 - 5. Corresponding relationships between terms]

[0046] In the embodiments described above, the S - shaped spring 23 corresponds to an example of the support member and the spring member.

[0047] [2. Other embodiments]

[0048] One embodiment of the present disclosure has been described above, but the present disclosure is not limited to the above - described embodiment and can be implemented with various modifications.

[0049] (2a) In the above - described embodiment, the manner in which the S - shaped spring 23 supports the seat cushion pad 21 is shown, but the support member for supporting the seat cushion pad 21 is not limited to the S - shaped spring. For example, it can also be a pan frame or the like.

[0050] In the above-described embodiment, a method of changing the stiffness of the seat cushion 3 by changing the intervals of the plurality of convex portions 43 of the S-shaped spring 23 is shown. However, a method other than changing the intervals of the plurality of convex portions 43 of the S-shaped spring 23 may be employed to change the stiffness.

[0051] A plurality of functions possessed by one component in the above-described embodiment may be implemented by a plurality of components, or one function possessed by one component in the above-described embodiment may be implemented by a plurality of components. Further, a plurality of functions possessed by a plurality of components may be implemented by one component, or one function implemented by a plurality of components may be implemented by one component. In addition, a part of the configuration of the above-described embodiment may be omitted. At least a part of the configuration of the above-described embodiment may be added to the configuration of the above-described other embodiment, or at least a part of the configuration of the above-described embodiment may be replaced with the configuration of the above-described other embodiment.

Claims

1. A vehicle seat installed in a vehicle, wherein the vehicle seat is characterized in that it has a seat cushion and The seat cushion is formed so that, at a buttocks support seat surface that supports buttocks of a seated person sitting on the vehicle seat, the rigidity of the seat cushion increases as the seat cushion is located on a front side of the vehicle.

2. The vehicle seat according to claim 1, characterized in that: The seat cushion comprises: a seat cushion block, the seat cushion block comprising the buttocks support seat surface; and a support member supporting the seat cushion block below the buttocks support seat surface, The support member is a spring member, and is formed so that the spring constant thereof increases as it is located on the front side of the vehicle.

3. The vehicle seat according to claim 2, characterized in that: The spring member as the supporting member has a plurality of straight portions and a plurality of convex portions, and the spring member is arranged such that the straight portions and the convex portions are alternately arranged.

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