Vehicle seat

Abstract

The present disclosure provides a vehicle seat that reduces different seating comfort levels due to a seated person's posture. According to one aspect of the present disclosure, a vehicle seat mounted on a vehicle is provided with a seat cushion and a seat back. The seat cushion is provided with a hip supporting seat surface for supporting the hip of a seated person from below, and a thigh supporting seat surface for supporting the thighs of the seated person from below. The seat back is provided with a waist support surface for supporting the waist of the seated person and a chest support surface for supporting the chest of the seated person. The seat cushion and the seat back are disposed such that the hip angle formed between the hip support seat surface and the waist support surface is 93-101 degrees. The seat back is formed such that the angle formed between the waist support surface and the chest support surface, i.e., the neck angle, is 17.4-24.2 degrees.

Description

Technical Field

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

[0002] As described in Japanese Unexamined Patent Application Publication No. 2020-199919, since the sitting postures of a seated person on a vehicle seat (such as a standard posture, a hunchback posture, and a straight-back posture) are different, the seat pressure distribution when the seated person feels comfortable changes. Summary of the Invention

[0003] There is a problem that a vehicle seat acceptable to a seated person in a first posture (such as a standard posture) may become an unacceptable vehicle seat for a seated person in a second posture different from the first posture (such as a hunchback posture or a straight-back posture).

[0004] One aspect of the present disclosure aims to reduce the difference in sitting comfort caused by the posture of the seated person.

[0005] One solution of the present disclosure is a vehicle seat installed on a vehicle, which includes a seat cushion and a seat backrest.

[0006] The seat cushion sequentially includes a hip support seat surface and a thigh support seat surface along the front-rear direction of the vehicle from the rear side. Among them, the hip support seat surface supports the hip of the seated person sitting on the vehicle seat from below, and the thigh support seat surface supports the thigh of the seated person from below.

[0007] The seat backrest sequentially includes a lumbar support surface for supporting the lumbar region of the seated person and a chest support surface for supporting the chest of the seated person along the up-down direction of the vehicle from the lower side.

[0008] The seat cushion and the seat backrest are configured such that the hip angle formed between the hip support seat surface and the lumbar support surface is 93° to 101°.

[0009] The seat backrest is formed such that the neck angle formed between the lumbar support surface and the chest support surface is 17.4° to 24.2°.

[0010] According to the vehicle seat of the present disclosure configured as described above, regardless of the posture of the seated person, more seated persons can feel that the seat is acceptable, and thus the difference in sitting comfort caused by the posture of the seated person can be reduced.

[0011] In one solution of the present disclosure, the hip angle can be 97°, and the neck angle can be 20.8°.

[0012] The vehicle seat according to the above configuration can further reduce the difference in seating comfort caused by the posture of the seated person. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view showing the configuration of a vehicle seat.

[0014] FIG. 2 is a diagram for explaining the hip angle and the neck angle of the vehicle seat.

[0015] FIG. 3 is a bubble chart showing the results of a sensory test for selecting the vehicle seat with the most comfortable seating feeling.

[0016] FIG. 4 is a bubble chart showing the results of a sensory test for answering whether the seat is acceptable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0018] [1. First Embodiment]

[0019] [1-1. Configuration of Vehicle Seat]

[0020] The vehicle seat 1 of the present embodiment is installed in a vehicle and, as Figure 1 shown, it has 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.

[0021] The vehicle seat 1 of the present embodiment is used as a seat for a passenger car. In addition, the directions in the following description and in each drawing represent the directions in the state where the vehicle seat 1 is assembled to the vehicle. Further, in the present 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.

[0022] The seat cushion 3 sequentially includes a hip support seat surface 11 and a thigh support seat surface 12 along the front-rear direction of the vehicle from the rear side. Among them, the hip support seat surface 11 mainly supports the hips of the seated person from below, and the thigh support seat surface mainly supports the thighs of the seated person from below.

[0023] The seat back 5 sequentially includes a lumbar support surface 31 that mainly supports the lumbar region of the seated person and a chest support surface 32 that mainly supports the chest of the seated person along the up-down direction of the vehicle from the lower side.

[0024] As Figure 2As shown, the hip angle θ1 of the vehicle seat 1 is the angle formed between the hip support seat surface 11 and the lumbar support surface 31. The neck angle θ2 of the vehicle seat 1 is the angle formed between the lumbar support surface 31 and the chest support surface 32.

[0025] In the vehicle seat 1, the height difference between the heel point P1 and the hip point P2 (hereinafter referred to as the heel-hip height difference DH) is between 200 mm and 360 mm. The heel point P1 is the position where the heel of the seated person touches the floor of the vehicle. The hip point P2 is the outermost part of the femur of the seated person.

[0026] [1-2. Sensory test of sitting posture]

[0027] The applicant of the present application conducted a sensory test with 350 employees belonging to the applicant as subjects. They successively sat on the 1st vehicle seat, the 2nd vehicle seat, the 3rd vehicle seat, the 4th vehicle seat, the 5th vehicle seat, the 6th vehicle seat, the 7th vehicle seat, the 8th vehicle seat, and the 9th vehicle seat, and selected the vehicle seat that felt the most comfortable to sit on. Among them, the seating postures of the 1st vehicle seat to the 9th vehicle seat are different from each other. The 350 employees include Japanese employees, American employees, European employees, and Thai employees.

[0028] The hip angle θ1 of the 1st vehicle seat is set to 89°, and the neck angle θ2 is set to 27.6°. The 1st vehicle seat corresponds to a straight-back sitting posture.

[0029] The hip angle θ1 of the 2nd vehicle seat is set to 105°, and the neck angle θ2 is set to 14.0°. The 2nd vehicle seat corresponds to a hunched-back sitting posture.

[0030] The hip angle θ1 of the 3rd vehicle seat is set to 89°, and the neck angle θ2 is set to 14.0°. The 3rd vehicle seat corresponds to a forward-leaning sitting posture.

[0031] The hip angle θ1 of the 4th vehicle seat is set to 105°, and the neck angle θ2 is set to 27.6°. The 4th vehicle seat corresponds to a reclined sitting posture.

[0032] The hip angle θ1 of the 5th vehicle seat is set to 97°, and the neck angle θ2 is set to 20.8°. The 5th vehicle seat is a central sitting posture relative to all straight-back, hunched-back, forward-leaning, and reclined sitting postures.

[0033] The hip angle θ1 of the sixth vehicle seat is set at 93°, and the neck angle θ2 is set at 24.2°.

[0034] The hip angle θ1 of the seventh vehicle seat is set at 101°, and the neck angle θ2 is set at 17.4°.

[0035] The hip angle θ1 of the eighth vehicle seat is set at 93°, and the neck angle θ2 is set at 17.4°.

[0036] The hip angle θ1 of the ninth vehicle seat is set at 101°, and the neck angle θ2 is set at 24.2°.

[0037] As Figure 3 shown in the bubble chart C1, among all the subjects, 7% of the subjects replied that the seating feeling of the first vehicle seat was the most comfortable.

[0038] 8% of the subjects replied that the seating feeling of the second vehicle seat was the most comfortable.

[0039] 6% of the subjects replied that the seating feeling of the third vehicle seat was the most comfortable.

[0040] 12% of the subjects replied that the seating feeling of the fourth vehicle seat was the most comfortable.

[0041] 23% of the subjects replied that the seating feeling of the fifth vehicle seat was the most comfortable.

[0042] 10% of the subjects replied that the seating feeling of the sixth vehicle seat was the most comfortable.

[0043] 13% of the subjects replied that the seating feeling of the seventh vehicle seat was the most comfortable.

[0044] 7% of the subjects replied that the seating feeling of the eighth vehicle seat was the most comfortable.

[0045] 13% of the subjects replied that the seating feeling of the ninth vehicle seat was the most comfortable.

[0046] Figure 3 The figure G1 in

[0047] is a figure that converts the distribution of the bubble chart C1 into the distribution of the hip angle θ1. For the first vehicle seat and the third vehicle seat with a hip angle θ1 of 89°, 7% and 6% of the subjects respectively replied that the seating feeling of this seat was the most comfortable. Therefore, the average value of the subjects who like (in other words, feel the most comfortable seating feeling) a hip angle θ1 of 89° is (7 + 6) / 2 = 6.5%.

[0048] For the 6th vehicle seat and the 8th vehicle seat with a hip angle θ1 of 93°, 10% and 7% of the subjects respectively answered that the seating feeling of this seat was the most comfortable. Therefore, the average value of the subjects who liked a hip angle θ1 of 93° was (10 + 7) / 2 = 8.5%.

[0049] For the 5th vehicle seat with a hip angle θ1 of 97°, 23% of the subjects answered that the seating feeling of this seat was the most comfortable. Therefore, the average value of the subjects who liked a hip angle θ1 of 97° was 23%.

[0050] For the 7th vehicle seat and the 9th vehicle seat with a hip angle θ1 of 101°, 13% and 13% of the subjects respectively answered that the seating feeling of this seat was the most comfortable. Therefore, the average value of the subjects who liked a hip angle θ1 of 101° was (13 + 13) / 2 = 13%.

[0051] For the 2nd vehicle seat and the 4th vehicle seat with a hip angle θ1 of 105°, 8% and 12% of the subjects respectively answered that the seating feeling of this seat was the most comfortable. Therefore, the average value of the subjects who liked a hip angle θ1 of 105° was (8 + 12) / 2 = 10%.

[0052] The sum of the above five average values was (6.5 + 8.5 + 23 + 13 + 10) = 61%. Therefore, multiply the above five average values by (100 / 61) respectively, and calculate the proportions when the hip angle θ1 was 89°, 93°, 97°, 101°, and 105°, thus obtaining Figure G1.

[0053] As shown in Figure G1, when the hip angle θ1 changed from 89° to 93°, the increase rate of the proportion of subjects who answered that the seating feeling of this seat was the most comfortable was small.

[0054] In addition, when the hip angle θ1 changed from 93° to 97°, the increase rate of the proportion of subjects who answered that the seating feeling of this seat was the most comfortable was large.

[0055] In addition, when the hip angle θ1 changed from 105° to 101°, the increase rate of the proportion of subjects who answered that the seating feeling of this seat was the most comfortable was small.

[0056] In addition, when the hip angle θ1 changed from 101° to 97°, the increase rate of the proportion of subjects who answered that the seating feeling of this seat was the most comfortable was large.

[0057] Therefore, it can be considered that when the hip angle θ1 was 93° - 101°, the difference in seating comfort caused by the posture of the seated person could be effectively reduced.

[0058] Figure 3 In Figure G2, the distribution of the bubble chart C1 is transformed into the distribution of the neck angle θ2.

[0059] For the second and third vehicle seats with a neck angle θ2 of 14.0°, 8% and 6% of the subjects respectively answered that the seating feeling of this seat was the most comfortable. Therefore, the average value when the neck angle θ2 is 14.0° is (8 + 6) / 2 = 7%.

[0060] For the seventh and eighth vehicle seats with a neck angle θ2 of 17.4°, 13% and 7% of the subjects respectively answered that the seating feeling of this seat was the most comfortable. Therefore, the average value when the neck angle θ2 is 17.4° is (13 + 7) / 2 = 10%.

[0061] For the fifth vehicle seat with a neck angle θ2 of 20.8°, 23% of the subjects answered that the seating feeling of this seat was the most comfortable. Therefore, the average value when the neck angle θ2 is 20.8° is 23%.

[0062] For the sixth and ninth vehicle seats with a neck angle θ2 of 24.2°, 10% and 13% of the subjects respectively answered that the seating feeling of this seat was the most comfortable. Therefore, the average value of the subjects who like the neck angle θ2 of 24.2° is (10 + 13) / 2 = 11.5%.

[0063] For the first and fourth vehicle seats with a neck angle θ2 of 27.6°, 7% and 12% of the subjects respectively answered that the seating feeling of this seat was the most comfortable. Therefore, the average value of the subjects who like the neck angle θ2 of 24.2° is (7 + 12) / 2 = 9.5%.

[0064] The sum of the above five average values is (7 + 10 + 23 + 11.5 + 9.5) = 61%. Therefore, multiply the above five average values by (100 / 61) respectively, and calculate the proportions when the neck angles θ2 are 14.0°, 17.4°, 20.8°, 24.2°, and 27.6°, and thus Figure G2 is obtained.

[0065] As shown in Figure G2, when the neck angle θ2 changes from 14.0° to 17.4°, the increase rate of the proportion of subjects who answer that the seating feeling of this seat is the most comfortable is small.

[0066] When the neck angle θ2 changes from 17.4° to 20.8°, the increase rate of the proportion of subjects who answer that the seating feeling of this seat is the most comfortable is large.

[0067] When the neck angle θ2 changes from 27.6° to 24.2°, the increase rate of the proportion of subjects who answered that the seating feeling of the seat is the most comfortable is small.

[0068] When the neck angle θ2 changes from 24.2° to 20.8°, the increase rate of the proportion of subjects who answered that the seating feeling of the seat is the most comfortable is large.

[0069] Therefore, it can be considered that when the neck angle θ2 is 17.4° to 24.2°, the difference in seating comfort caused by the posture of the seated person can be effectively reduced.

[0070] The applicant of the present application conducted a sensory test. Taking 350 employees belonging to the applicant as subjects, they successively sat on the first vehicle seat, the second vehicle seat, the third vehicle seat, the fourth vehicle seat, and the fifth vehicle seat, and answered whether they accepted sitting on the above vehicle seats. Among them, the seating postures of the first vehicle seat to the fifth vehicle seat are different from each other.

[0071] As Figure 4 shown, for the first vehicle seat, 48% of all the subjects answered "acceptable".

[0072] For the second vehicle seat, 61% of all the subjects answered "acceptable".

[0073] For the third vehicle seat, 41% of all the subjects answered "acceptable".

[0074] For the fourth vehicle seat, 58% of all the subjects answered "acceptable".

[0075] For the fifth vehicle seat, 85% of all the subjects answered "acceptable".

[0076] In addition, Figure 4 the area of the circle formed by the dotted line in Figure 4 represents 100%. Moreover,

[0077] the circle formed by the solid line in

[0078] [1-3. Effects]

[0079] According to the embodiments described in detail above, the following effects can be obtained.

[0080] The vehicle seat 1 can reduce the difference in seating comfort caused by the posture of the seated person by forming the hip angle θ1 to be 93° to 101° and the neck angle θ2 to be 17.4° to 24.2°.

[0081] The vehicle seat 1 can further reduce the difference in seating comfort caused by the posture of the seated person when the hip angle θ1 is 97° and the neck angle θ2 is 20.8°.

[0082] [2. Other Embodiments]

[0083] One embodiment of the present disclosure has been described above, but the present disclosure is not limited to the above embodiment and can be implemented with various modifications.

[0084] (2a) Multiple functions of one component in the above embodiment can be realized by multiple components, or one function of one component in the above embodiment can be realized by multiple components. In addition, multiple functions of multiple components can be realized by one component, or one function realized by multiple components can be realized by one component. In addition, a part of the configuration of the above embodiment can be omitted. At least a part of the configuration of the above embodiment can also be added to the configuration of the above other embodiments, or at least a part of the configuration of the above embodiment can be replaced with the configuration of the above other embodiments.

Claims

1. A seat for a vehicle, which is installed on a vehicle. The seat for the vehicle includes a seat cushion and a seat backrest, and is characterized in that the seat cushion sequentially includes a hip support seat surface and a thigh support seat surface along the front-rear direction of the vehicle from the rear side. Among them, the hip support seat surface supports the hip of a seated person sitting on the seat for the vehicle from below, and the thigh support seat surface supports the thigh of the seated person from below. the seat backrest sequentially includes a lumbar support surface for supporting the lumbar region of the seated person and a chest support surface for supporting the chest of the seated person along the up-down direction of the vehicle from the lower side. the seat cushion and the seat backrest are configured such that the angle formed between the hip support seat surface and the lumbar support surface, i.e., the hip angle, is 93° to 101°. the seat backrest is formed such that the angle formed between the lumbar support surface and the chest support surface, i.e., the neck angle, is 17.4° to 24.2°.

2. The seat for a vehicle according to claim 1, characterized in that the hip angle is 97°, the neck angle is 20.8°.

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