JP2023000143A - vehicle seat - Google Patents

Abstract

To improve comfortability of an occupant in a vehicle seat where at least a seating face is made of rigid resin.SOLUTION: A seat is given in which: at least a seating face thereof is made of rigid resin; and the seating face includes a recess part formed in the center part in the crosswise direction, and curve surface parts which are arranged at both right and left sides of the recess part and protrude upward. When an occupant dummy whose estimated ischium pitch is 94 mm of JM05 type or more and estimated ischium pitch is 147 mm of AF95 type or less is seated, the recess part has a depth where a tail part of the occupant dummy at the bottom edge of ischium is separated along the crosswise direction width wider than the ischium pitch. The tail part of the occupant dummy in the crosswise direction outside of the bottom edges of the ischium at both right and left sides is supported by the curve surface parts at both right and left sides. A cross-sectional shape of the seating face where a longitudinal position is defined by the hip point is given in which the curve part forming the curve surface part contacts with the tail part, and an inclination angle of a tangent line passing through a contact point between the tail part and the curve part with respect to the cross wise direction is 10-16 degrees.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat in which at least a seat surface portion is made of hard resin, and to improving the comfort of an occupant.

Patent Literature 1 describes a seat cushion that is made of a soft resin (urethane) and that is laid on the upper surface of a seat of a wheelchair or the like. This cushion has a recess formed in the rear edge thereof, and the sitting bone is accommodated in the recess when a person is seated. As a result, body pressure is not concentrated on the ischium, and it is said that the buttocks are less likely to hurt.

JP-A-2003-000394

In order to facilitate the cleaning of the interior of public vehicles and reduce the time and effort required to wash the seats, seats with only the seat surface or both the seat and backrest made of hard resin are adopted. can be considered. However, in the conventionally used seat made of hard resin, there is room for improvement in terms of improving the comfort of the occupant because the buttocks under the seat bone come into contact with the hard seat surface when the occupant sits down. . On the other hand, if the occupant in the seat tends to shift to the left or right of the seat as the vehicle shakes, the seating position of the occupant becomes unstable. There is room.

SUMMARY OF THE INVENTION An object of the present invention is to improve the comfort of an occupant in a vehicle seat in which at least a seat surface portion is formed of hard resin.

A vehicle seat according to the present invention is a vehicle seat in which at least a seat surface portion is formed of a hard resin, and the seat surface of the vehicle seat includes a recess formed in a central portion in the left-right direction and left and right sides of the recess. An occupant dummy having a isch bone pitch equal to or greater than JM05 type with an estimated ischal pitch of 94 mm and equal to or less than AF95 type with an estimated isch bone pitch of 147 mm was seated. In this case, the recess has a width in the left-right direction wider than the pitch of the seat bones, and has a depth such that the buttocks of the lower ends of the seat bones corresponding to the occupant dummy are spaced apart from each other. The buttocks outside the lower end in the left-right direction are supported by the curved surface portions on both the left and right sides, and are positioned in the front-rear direction by hip points set according to the vehicle seat in the vehicle. On the other hand, the transverse cross-sectional shape perpendicular to the curved surface portion is in contact with the hip portion at the curved portion, and the tangent line of the curved portion passing through the contact point of the hip portion and the curved portion has an inclination angle of 10 degrees to 16 degrees with respect to the left-right direction. It is a vehicle seat in the range of degrees.

According to the vehicle seat according to the present invention, regardless of whether at least the seat surface portion is made of hard resin, when an adult occupant of many physiques sits on the seat, the space between the buttock portion of the lower end of the seat bone and the inner surface of the concave portion can be adjusted. Since a gap can be provided at the bottom, the buttocks are less likely to hurt. This can improve the comfort of many occupants. Further, in the cross-sectional shape of the seat, the tangent line passing through the contact point between the buttocks portion and the curved portion of the seat is inclined at an angle of 16 degrees or less with respect to the left-right direction. As a result, it is possible to obtain comfortable sitting comfort without tightening the buttocks only by pressing the buttocks to the center of the seat. Furthermore, since the inclination angle is 10 degrees or more, it is possible to prevent the occupant from slipping sideways even when the vehicle sways in the lateral direction of the seat. This can also improve the comfort of many occupants.

1 is a schematic top view of a seat arrangement configuration of a vehicle equipped with a vehicle seat according to an embodiment of the present invention; FIG. 1 is a perspective view of a vehicle seat according to an embodiment; FIG. FIG. 2 is a side view of a state in which an occupant dummy is seated on the vehicle seat according to the embodiment; FIG. 4 is a cross-sectional view taken along line AA of FIG. 3 showing the relationship between the seat surface of the vehicle seat and the buttocks corresponding to the occupant dummy; It is a figure which shows one example of a crew member's pelvis. FIG. 5 is a view corresponding to FIG. 4 showing the relationship between the seat surface and the buttocks corresponding to occupant dummies of JM05 type (a) and AF95 type (b) in an example of the vehicle seat of the embodiment;

An embodiment of a vehicle seat according to the present invention will be described below. FIG. 1 is a top view of a seat arrangement configuration of a vehicle 1 in which a vehicle seat 10 of the embodiment is mounted.

A plurality of vehicle seats 10 are mounted on a vehicle 1 such as a public bus and used. A vehicle interior of the vehicle 1 is provided with a plurality of vehicle seats 10 on which passengers are seated. The vehicle seat 10 is hereinafter referred to as the seat 10 . For example, at least some of the plurality of passenger seats 10 are arranged side by side in the front-rear direction along the wall surface 2 at the end in the vehicle width direction of the vehicle interior. An occupant seated on the seat 10 faces the vehicle width direction. On the other hand, a driver's seat (not shown) on which the driver sits is provided in the front part of the vehicle interior. The vehicle 1 may omit the driver's seat and be an automatically driven vehicle whose operation is controlled according to a predetermined schedule. A doorway (not shown) that is opened and closed by a door is provided at the end opposite to the plurality of seats 10 in the vehicle width direction of the vehicle 1, and passengers get on and off the vehicle 1 through the doorway. Note that the plurality of seats may be arranged side by side in the vehicle width direction, for example, in the rear portion of the vehicle compartment.

The seat 10 will be described in detail below with reference to FIGS. 2 to 6. FIG. FIG. 2 is a perspective view of the seat 10. FIG.

The seat 10 comprises a seat portion 12 and a back portion 50 which are separated from each other. The seat surface portion 12 and the backrest portion 50 are made of hard resin. The hard resin is, for example, polypropylene resin (PP) or polyethylene terephthalate resin (PET). As a result, in the vehicle 1 provided with the seat 10, wiping is easier than when the flexible seat 10 formed of a cushioning material such as cloth or urethane is used, so that the vehicle interior can be cleaned more easily. Since it is not necessary to remove the sheet 10 from 1 and wash it, labor for washing can be reduced.

The seat surface portion 12 has a plate shape that is substantially rectangular when viewed from above. The seat surface portion 12 is rotatably supported in the front-rear direction with respect to the wall surface 2 by two seat support portions 40 and 41 that are fixed to the wall surface 2 with a left-right separation. The backrest portion 50 is fixed to the wall surface 2 by a plurality of locking structures provided between the wall surface 2 and the backrest portion 50 .

The seat portion 12 is of a flip-up type, and one seat support portion 40 includes a cover 42 and a spiral spring (not shown) provided within the cover 42 . One end of a spiral spring is fixed to a shaft (not shown) protruding from one lateral end surface of the base end portion of the seat surface portion 12 . The seat surface portion 12 is urged in a direction to rotate rearward toward a substantially upright state from a state in which the seat surface portion 12 is disposed so as to fall forward and protrude from the wall surface 2 by the elasticity of the spiral spring. As a result, when an occupant is seated on the seat 10, the seat surface portion 12 protrudes forward due to the weight of the occupant. Raised. The seat 10 is not limited to a flip-up type, and may be in a state in which the seat portion is always fixed to the vehicle 1 . Further, in the seat 10, the seat surface portion and the backrest portion may be integrated by integral molding or the like.

The seat surface 14, which is the upper surface of the seat surface portion 12, has a concave portion 16 formed in the middle portion in the front-rear direction and in the center portion in the left-right direction, and convex curved surface portions 18 and 20 that are provided on both left and right sides of the concave portion 16 and protrude upward. have.

FIG. 3 is an occupant dummy equivalent within a predetermined range having a seat bone pitch equal to or larger than JM05 type having an estimated ischal bone pitch of 94 mm and equal to or smaller than an AF95 type having an estimated ischal bone pitch of 147 mm on the seat 10 (hereinafter referred to as an occupant dummy equivalent to a predetermined range dummy). .) is a side view of the state in which 60 is seated. FIG. 4 is a cross-sectional view taken along line AA of FIG. 3 showing the relationship between the seat surface 14 of the seat 10 and the buttocks portion 61 of the predetermined range dummy equivalent 60. As shown in FIG. In FIGS. 3 and 4, the shape of an AM50 type occupant dummy, which is an intermediate form of 60a and 60b (FIG. 6) corresponding to occupant dummies of JM05 type and AF95 type, which are defined in the present invention, is used. and the seat 10 will be described. Here, "equivalent to an occupant dummy" means an AM50 occupant dummy, or based on the shape of the AM50 occupant dummy, the width of the buttocks of the AM50 occupant dummy is adjusted to match the width of the buttocks of the dummy assumed to be seated. It means the pseudo shape of the occupant obtained by enlarging or reducing the shape of the AM50 type occupant dummy and the pitch of the sit bones. When the predetermined range dummy 60 is seated on the seat 10, the recess 16 has a lateral width W1 (FIG. 4) wider than the ischial bone pitch of the predetermined range dummy 60, and the buttocks 61a at the bottom end of the predetermined range dummy 60. have a depth d apart from each other. Accordingly, as will be described later, the pain in the buttocks 61 of many occupants corresponding to the predetermined range dummy 60 can be reduced, so that the comfort of the occupants can be improved.

Here, the predetermined range dummy equivalents 60 include JM05 to JM95 types, JF05 to JF95 types, AM05 to AM95 types, and AF05 to AM95 type occupant dummies. JM represents Japanese adult males and JF represents Japanese adult females. AM represents adult US males and AF represents adult US females. Numbers such as 05, 95, etc. following JM, JF, AM, and AF are dummies corresponding to the physiques of people belonging to that number's percentage of the whole group when the people in that group are arranged in descending order of height. show. For example, the JM05 type is a dummy with a small physique that belongs to the bottom 5% when a group of Japanese adult males is arranged in descending order of height. The AF95 type is a large-bodied dummy that belongs to the bottom 95% of the group of adult US women in ascending order of height. In addition, females tend to have a smaller ischial pitch than males, and Americans tend to have a larger ischial pitch than Japanese. It is also known that the minimum ischial bone pitch is 94 mm and the maximum ischial bone pitch is 147 mm in the height range from JF05 to AM95. For this reason, it is presumed that the JM05 type is equivalent to an occupant dummy with an estimated ischal pitch of 94 mm, and the AF95 type is equivalent to an occupant dummy with an estimated ischal bone pitch of 147 mm, which is the maximum. be done. The ischium pitches of the JM05 type and the AF95 type are assumed to be the estimated ischium pitches described above.

As shown in FIG. 4 , the AM50 type has a sit bone pitch that is intermediate between the estimated isch bone pitches of the JM05 type and the AF95 type. there is

FIG. 5 shows an example of an occupant's pelvis. Left and right sit bones 63 are provided at the left and right lower ends of the pelvis of the occupant when viewed from the front. In this example, the hip portion 61a at the lower end of the ischium 63 can be prevented from coming into contact with the seat surface 14 of the seat 10, so that the occupant's pain when sitting can be suppressed.

Further, as shown in FIG. 4, when the predetermined range dummy 60 is seated on the seat 10, the buttocks 61b on the left and right sides of the predetermined range dummy, which are laterally outward from the lower ends of the ischial bones, are located on the left and right sides of the seat surface 14. It is supported by convex curved surfaces 18 and 20 . At this time, the cross-sectional shape of the seat surface 14 is such that the curved portions 18a and 20a forming the convex curved surface portions 18 and 20 are in contact with the bottom portion 61b of the dummy equivalent 60 within a predetermined range, and the bottom portion 61b and the curved portions 18a and 20a are in contact with each other. The inclination angle of the tangent line L1 of the curved portions 18a and 20a passing through the points of contact P1 and P2 with respect to the horizontal direction is in a predetermined range of 10 degrees to 16 degrees. In FIG. 4, W2 and W3 indicate the lateral widths of the convex curved surface portions 18 and 20, respectively. As for the inclination angle, a narrow predetermined range of 12 degrees to 15 degrees is recommended as an easy-to-use range. Here, the cross-sectional shape is a cross-sectional shape whose longitudinal position is determined by the hip point HP set according to the seat 10 and which is perpendicular to the longitudinal direction of the seat surface 14 . That is, the cross-sectional shape of the seat 10 in FIG. 4 is set at a position passing through the hip point HP. The hip point HP is a position corresponding to the center of rotation of the thighs with respect to the trunk, which is determined by the value reported by the vehicle manufacturer. The hip point HP is actually determined by the positions in the front-back direction, the height direction, and the left-right direction. In order to determine it, it is sufficient to know the position of the hip point HP in the front-rear direction, and FIG. 4 shows a dashed-dotted line extending in the left-right direction through the height position of the hip point HP as the hip point HP.

FIG. 6 shows the relationship between the seat surface 14 and the buttocks 71 and 72 of the occupant dummies 60a and 60b of the JM05 type (a) and the AF95 type (b) in an example of the seat 10. As shown in FIG. As shown in FIG. 6(a), the JM05-type buttocks portion 71 has a relatively small length in the left-right direction. As a result, the curved portions 18a and 20a forming the left and right convex curved surface portions 18 and 20 in the lateral cross-sectional shape of the seat surface 14 are in contact with the hip portion 71 relatively centrally in the left-right direction. A tangent line L2 passing through the points of contact P1 and P2 on 18a and 20a has a relatively large inclination angle of 15 degrees with respect to the horizontal direction.

On the other hand, as shown in FIG. 6B, the rear portion 72 of the AF95 type has a relatively large length in the left-right direction. As a result, the curved portions 18a and 20a forming the left and right convex curved surface portions 18 and 20 in the lateral cross-sectional shape of the seat surface 14 are in contact with the hip portion 72 relatively outside in the left-right direction. , 20a, the angle of inclination of the tangent line L3 passing through the points of contact P1 and P2 with respect to the horizontal direction is 12 degrees, which is relatively small. In both cases of FIGS. 6A and 6B, the angle of inclination with respect to the left-right direction of tangent lines L2 and L3 passing through points of contact P1 and P2 of the buttocks 71 and 72 and the curved portions 18a and 20a is in the range of 12 degrees to 15 degrees. be.

As described above, the inclination angles of the tangent lines L1 to L3 of the curved portions 18a and 20a are 16 degrees or less. As a result, it is possible to obtain comfortable sitting comfort without tightening the buttocks only by pressing the buttocks to the center of the seat. Furthermore, since the inclination angle is 10 degrees or more, even if the vehicle 1 swings in the left-right direction of the seat 10, the occupant's lateral shift can be suppressed. For example, when the seats 10 are arranged side by side in the longitudinal direction of the vehicle 1 as shown in FIG. Since the occupant can be prevented from slipping laterally with the seat surface shape of No. 10, lateral slippage of the occupant can be suppressed regardless of acceleration or deceleration. Further, when the inclination angle is configured to fall within a predetermined range of 12 degrees to 15 degrees, high effects can be obtained in both suppression of pain in the buttocks of the occupant and suppression of side slip of the occupant. . On the other hand, as a comparative example different from the present invention, in the configuration in which the inclination angle is smaller than 10 degrees, the effect of suppressing the side slip of the passenger seated on the seat is reduced. Further, as a comparative example, in a configuration in which the inclination angle is greater than 16 degrees, the tightening feeling of the buttocks due to the left and right curved surface portions is increased.

Therefore, according to the seat 10 described above, regardless of the seat 10 having the seat surface portion 12 made of hard resin, an adult occupant of many physiques, while sitting on the seat 10, can feel the buttocks of the lower end of the seat bone and the inner surface of the recess 16. A gap can be provided between them, and relatively soft buttocks outside the lower ends of the ischial bones on both left and right sides of many adult occupants in the left and right direction are supported by the convex curved surfaces 18 and 20 on both left and right sides. That is, the portion including the lower end of the ischium surrounded by the dashed frame in FIG. As a result, the buttocks of many passengers are less likely to get hurt, and the comfort of many passengers can be improved. Further, in the cross-sectional shape of the seat 10, the tangent lines L1 to L3 passing through the points of contact between the buttock portion and the curved portions 18a and 20a of the seat 10 are inclined with respect to the left-right direction at an inclination angle within a predetermined range of 10 degrees to 16 degrees. Therefore, it is possible to obtain a comfortable sitting feeling without tightening the buttocks, and it is possible to suppress the lateral shift of the occupant even when the vehicle 1 swings in the lateral direction of the seat 10.例文帳に追加This can also improve the comfort of many occupants.

The present inventor conducted a sensory evaluation test by an evaluator in order to confirm the effect of the embodiment. In this test, the inclination angle of the seating surface 14 of the seat 10 was set to a predetermined range of 12 degrees to 15 degrees, and the recessed portion 16 had a width in the lateral direction wider than the pitch of the seat bones when a JM05 type occupant dummy was seated. A seat 10 having a depth such that the buttocks of the lower ends of the seat bones corresponding to the occupant dummy are spaced apart by 5 mm or more was used. Then, 10 or more evaluators were sequentially seated in a vehicle having the seat 10 . The 10 or more raters are adults, including men and women. After the vehicle was kept stationary for about 20 minutes with the evaluator seated, the evaluator confirmed whether or not he/she felt pain. Also, after the vehicle was kept running for about 20 minutes, the evaluator confirmed whether or not pain occurred. As a result of the evaluation test, good evaluation results were obtained from all evaluators.

In the above embodiment, both the seat surface portion 12 and the backrest portion 50 of the seat 10 are made of hard resin. may be made of a material other than hard resin, such as soft resin.

Reference Signs List 1 vehicle, 2 wall surface, 10 vehicle seat (seat), 12 seat surface, 14 seat surface, 16 concave portion, 18, 20 convex curved surface portion, 18a, 20a curved portion, 40, 41 seat support portion, 42 cover, 50 backrest Part 60 Predetermined range dummy 60a, 60b occupant dummy equivalent 61, 61a, 61b buttocks 63 ischium 71, 72 buttocks.

Claims (1)

A vehicle seat in which at least a seat surface portion is formed of a hard resin,
The seat surface of the vehicle seat has a concave portion formed in a central portion in the left-right direction, and curved surface portions provided on both left and right sides of the concave portion and convex upward,
When an occupant equivalent having a seat bone pitch of JM05 type or higher with an estimated ischal pitch of 94 mm and AF95 type or lower with an estimated ischal pitch of 147 mm is seated,
The recess has a width in the left-right direction wider than the pitch of the sit bones and a depth such that the buttocks of the lower ends of the sit bones corresponding to the occupant dummy are separated from each other,
In addition, the buttocks on the right and left sides corresponding to the occupant dummy, which are laterally outward of the lower ends of the seat bones, are supported by the curved surface portions on the left and right sides, and move forward and backward at a hip point set according to the vehicle seat in the vehicle. The cross-sectional shape, which has a defined directional position and is orthogonal to the front-rear direction of the seat surface, is in contact with the hip portion at the curved portion that forms the curved surface portion, and extends from the curved portion that passes through the contact point between the hip portion and the curved portion. The angle of inclination of the tangent to the horizontal direction is in the range of 10 degrees to 16 degrees,
vehicle seat.

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