JP2015013621A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat allowing an occupant seated on a seat cushion section to easily perform stretching motions of his shoulders while securing physical posture retaining property and lateral G holding property of the occupant.SOLUTION: In a main support section 21, a center support section 21A is set in a central portion of a vehicle vertical direction, and a first support section 21B is set at an upper position of the center support section 21A. In each of side support sections 22, a second support section 22A is set at a side position of the center support section 21A, and a third support section 22B is set at an upper position of the second support section 22A. Hardness of the first support section 21B and the second support section 22A is set to a value higher than that of the center support section 21A. Hardness of the third support section 22B is set to a value lower than that of the center support section 21A.

Description

  The present invention relates to a vehicle seat including a seat back portion that stands on the rear side of a seat cushion portion on which an occupant sits and supports the back of the occupant.

  2. Description of the Related Art Conventionally, there has been known a vehicle seat that includes side support portions that protrude to the front of the vehicle and support the left and right sides of the center part of the occupant on both sides of the seat back portion that stands on the rear side of the seat cushion portion on which the occupant sits (For example, refer to Patent Document 1). Here, the side support part is set so that the width direction inner side part which contacts a passenger | crew is comparatively soft, and the width direction outer side part which is the outer side is set so that it may become comparatively hard.

Japanese Unexamined Patent Publication No. 2005-40479

By the way, when the occupant seated in the seat cushion part performs a stretching action of the shoulder part that is effective in recovering fatigue of the shoulder muscles in the sitting state, that is, a stretching action that pulls both shoulders back to the body and brings the shoulder blades together. Arms and shoulders come into contact with the widthwise outer portion of the side support.
On the other hand, in the conventional vehicle seat, since the outer side portion of the side support portion in the width direction is relatively hard, the side support portion is not easily deformed even when the arm of the occupant comes into contact. This hinders the operation of pulling the arms and shoulders backwards during stretching, and there is a problem that it is difficult to perform a sufficient stretching operation.
In addition, in order not to inhibit the stretching operation of the shoulder portion, it is conceivable that the hardness of the seat back portion is reduced and can be easily deformed by the pressing force of the occupant. However, in this case, the body of the seated occupant cannot be sufficiently supported, and there is a concern that the occupant may become unstable particularly when a lateral G acts.

  The present invention has been made paying attention to the above-mentioned problem, and it is possible for a vehicle capable of facilitating the stretching operation of the shoulder while ensuring the posture retaining property and the lateral G-holding property of the occupant seated on the seat cushion portion. The purpose is to provide a sheet.

In order to achieve the above object, a vehicle seat according to the present invention includes a seat cushion portion on which an occupant is seated, and a seat back portion that stands on the rear side of the seat cushion portion and supports the occupant. The portion includes a main support portion at the center in the vehicle width direction, and a pair of side support portions that are provided on both the left and right sides of the main support portion and project forward from the main support portion.
And the said main support part sets the center support part in the center part of the vehicle up-down direction, and has set the 1st support part in the upper position of the said center support part. Further, the side support part sets a second support part at a lateral position of the central support part, and sets a third support part at a position above the second support part. Furthermore, the coefficient of restitution of the first support part and the second support part is set to a value equal to or higher than that of the central support part, and the hardness of the third support part is lower than that of the central support part. Set to value.

In the vehicle seat of the present invention, the hardness of the first support portion set in the main support portion is set to a value equal to or higher than that of the central support portion of the main support portion. Here, since the 1st support part is set in the upper position of the center support part set to the center part of the vehicle up-and-down direction of the main support part, the crew member who sat on the seat cushion part by this 1st support part Can support the back. For this reason, the posture maintenance property of the seated passenger can be secured.
Moreover, the hardness of the 2nd support part set to the side support part is set to the value equivalent to or higher than the center support part of the main support part. Here, since the 2nd support part is set in the side position of the center support part set to the center part of the vehicle up-and-down direction of the main support part, the side part (body side part) of the crew member who sat down on the seat cushion part ) Can be supported. For this reason, even if lateral G acts on the occupant, the occupant can be stably supported, and so-called lateral G hold performance can be ensured.
On the other hand, the hardness of the 3rd support part set to the side support part is set to a value lower than the center support part of the main support part. Here, since the 3rd support part is set in the upper position of the 2nd support part set as the side support part, it contacts the occupant's upper arm part seated on the seat cushion part. For this reason, even if a passenger | crew performs the stretching operation | movement of a shoulder part in the state seated on the seat cushion part, a 3rd support part can be changed easily and a stretching operation | movement is not inhibited. Accordingly, it is possible to easily perform an operation of pulling an arm or a shoulder to the back of the body and to perform a stretching operation of the shoulder.
As a result, it is possible to facilitate the stretching operation of the shoulder while ensuring the posture retaining property and the lateral G-holding property of the occupant seated on the seat cushion portion.

1 is an overall perspective view showing a vehicle seat of Embodiment 1. FIG. FIG. 3 is a front view illustrating a seat back portion according to the first embodiment. It is explanatory drawing which shows the positional relationship of the seat back part of Example 1, and a passenger | crew's frame | skeleton. It is explanatory drawing which shows the stretch operation | movement of a shoulder part. It is an effect | action figure which shows the state which the passenger | crew who seated on the vehicle seat of Example 1 is performing the stretch operation | movement of a shoulder part. FIG. 6 is an operation explanatory diagram illustrating a lateral G hold property when a lateral G acts on an occupant seated on the vehicle seat according to the first embodiment. It is a whole perspective view which shows the vehicle seat of Example 2. FIG. (a) is explanatory drawing which shows the structure of the seat back part of the vehicle seat of Example 3, (b) is a perspective view which shows the seat frame of the vehicle seat of Example 3. FIG.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the vehicle seat of this invention is demonstrated based on Example 1- Example 3 shown to drawing.

Example 1
First, the configuration will be described.
The configuration of the vehicle seat in the first embodiment will be described by dividing it into [the overall configuration of the vehicle seat] and [the detailed configuration of the seat back portion].

[Overall structure of vehicle seat]
FIG. 1 is an overall perspective view illustrating a vehicle seat according to a first embodiment. Hereinafter, based on FIG. 1, the whole structure of the vehicle seat of Example 1 is demonstrated.

  As shown in FIG. 1, the vehicle seat 1 of the first embodiment includes a seat cushion portion 10 and a seat back portion 20.

  The seat cushion portion 10 is a so-called seating portion on which an occupant (not shown here) is seated. The seat cushion portion 10 has a recessed center so that an occupant can sit stably. The seat cushion portion 10 is supported on the passenger compartment floor surface 2 via a seat bracket 11 and is movable in the vehicle front-rear direction.

The seat back portion 20 is a so-called backrest that stands on the rear side 10 a of the seat cushion portion 10 and supports the back of an occupant seated on the seat cushion portion 10. Here, the seat back portion 20 is provided to be able to be tilted with respect to the seat cushion portion 10 via a hinge mechanism (not shown).
The seat back portion 20 includes a seat frame that is a skeleton member, a flexible seat pad, and a skin material. Then, a seat pad is attached around the seat frame and covered with a skin material. A headrest 12 that supports the head of the occupant is provided on the upper portion of the seat back portion 20.

[Detailed configuration of seat back]
FIG. 2 is a front view illustrating the seat back portion of the first embodiment. FIG. 3 is an explanatory diagram illustrating a positional relationship between the seat back portion and the occupant's skeleton in the first embodiment. Hereinafter, based on FIG.2 and FIG.3, the detailed structure of the seat back part of Example 1 is demonstrated.

As shown in FIG. 2, the seat back portion 20 has a main support portion 21 and a pair of side support portions 22 and 22. The main support portion is a portion that is disposed at a center portion in the vehicle width direction and supports a body center portion of a seated occupant. The pair of side support portions 22, 22 are provided on both the left and right sides of the main support portion 21 in the vehicle width direction, and protrudes forward of the vehicle from the main support portion 21. That is, the pair of side support portions 22 and 22 are portions that respectively support the left and right sides of the center part of the seated occupant.
Here, the “occupant's body central portion” is a torso portion centered on the occupant's spine, so-called back and waist. In addition, “both left and right sides of the central part of the body” refers to the vicinity of the passenger's side, shoulders, arms, and the like.

As shown in FIG. 2, the main support portion 21 is provided with a central support portion 21A and a first support portion 21B.
21 A of said center support parts are the center parts of the vehicle up-down direction, Comprising: The area | region which supports the gravity center 31 (refer FIG. 3) vicinity of the seated passenger 30 is set.
The first support portion 21B is a vehicle upper position of the central support portion 21A set to the main support portion 21, and is set to a region that supports the scapula 32a and the lower corner 32b of the scapula 32 of the seated occupant 30. The Here, the minimum dimension W1 in the vehicle width direction of the first support portion 21B is 250 mm.

As shown in FIG. 2, the side support portion 22 includes a second support portion 22A and a third support portion 22B.
22 A of said 2nd support parts are the side positions of the center support part 21A set to the main support part 21, Comprising: The area | region which supports the thorax side part 33a near the 9th thoracic vertebra of the seated crew member 30 Set to
The “thoracic vertebra” refers to the middle bone of the spine (the so-called spine), the “seventh thoracic vertebra” is the seventh thoracic vertebra from the top, and the “ninth thoracic vertebra” is the ninth thoracic vertebra from the top. . The “thorax” is a skeleton of the chest, and is a portion surrounded by the thoracic vertebra, a pair of ribs, and the sternum. Furthermore, the second support portion 22A is provided on each of the left and right side support portions 22, 22, but the maximum interval W2 between the left and right second support portions 22A, 22A is set to 360 mm.
The third support portion 22B is set in the vehicle upper position of the second support portion 22A set in the side support portion 22 and in an area in contact with the upper arm portion 34 of the seated occupant 30.
Further, here, the boundary between the second support portion 22A and the third support portion 22B is gradually inclined outward in the vehicle width direction toward the vehicle lower side.

The restitution coefficient (hardness) of the first support portion 21B is higher than the restitution coefficient of the central support portion 21A set on the main support portion 21, and the restitution coefficient of the second support portion 22A set on the side support portion 22. Is set to a lower value.
The restitution coefficient (hardness) of the second support portion 22A is the restitution coefficient of the central support portion 21A and the first support portion 21B set in the main support portion 21, and the third support portion set in the side support portion 22. It is set to a value higher than the restitution coefficient of 22B.
The restitution coefficient (hardness) of the third support portion 22B is the restitution coefficient of the central support portion 21A and the first support portion 21B set in the main support portion 21, and the second support portion set in the side support portion 22. It is set to a value that is lower than the restitution coefficient of 22A.

That is, the value of the coefficient of restitution (hardness) of each of the support portions 21A, 21B, 22A, and 22B in the seat back portion 20 is represented by the following formula (1).
3rd support part 22B <center support part 21A <1st support part 21B <2nd support part 22A ... (1)
In addition, in order to make the restitution coefficient of each support part 21A, 21B, 22A, 22B different, the seat pad which consists of a material of a different restitution coefficient for each support part 21A, 21B, 22A, 22B is used. In addition, a boundary region set to the same coefficient of restitution as the central support portion 21A is provided between the support portions 21A, 21B, 22A, and 22B.

Next, the operation will be described.
First, the “shoulder stretching operation” will be described, and then the operation of the vehicle seat of the first embodiment will be described separately as “shoulder stretch allowing operation” and “body support operation”.

[Stretching the shoulder]
FIG. 4 is an explanatory view showing a shoulder stretching operation. The shoulder stretching operation will be described below with reference to FIG.

If the driving of the vehicle is continued, the occupant (especially the driver) is forced to take a certain posture for a long time, the shoulder muscles are strengthened, and stiff shoulders and accumulation of fatigue occur. To eliminate stiff shoulders and recover from fatigue, the shoulder stretching action is effective, as shown in FIG. 4, by pulling both shoulders backward to bring the left and right shoulder blades together. .
Here, when the shoulder is stretched, the shoulder is rotated toward the back of the body with the top of the head as the center, and the arm is rotated toward the lower side of the vehicle with the shoulder as the center. As a result, the left and right shoulder blades at the base of the shoulder come close to each other.

[Shoulder stretch tolerance]
FIG. 5 is an operation explanatory view showing a state in which the shoulder is stretched by sitting on the vehicle seat of the first embodiment. Hereinafter, based on FIG. 5, the shoulder stretch permission effect | action of Example 1 is demonstrated.

  In the vehicle seat 1 of the first embodiment, the coefficient of restitution of the third support portion 22B of the side support portion 22 that contacts the upper arm portion 34 of the seated occupant 30 is the central support portion 21A or the first support portion 21A set in the main support portion 21. It is set to a value lower than the restitution coefficient of the support portion 21B (see FIG. 2) and the restitution coefficient of the second support portion 22A set to the side support portion 22. That is, the third support portion 22 </ b> B is a region having the lowest coefficient of restitution among the side support portions 22.

As a result, when the occupant 30 seated on the seat cushion portion 10 performs a shoulder stretch operation for rotating the shoulder portion toward the rear of the body in this seated state, as shown in FIG. The contacted third support portion 22B is easily deformed. Therefore, the seat back portion 20 does not hinder the shoulder stretching operation, and the occupant 30 can sufficiently move the arm (upper arm portion 34) toward the rear of the body.
As a result, it becomes easy to stretch around the scapula moving the arm and shoulder to the back of the body, it becomes easy to take a posture effective in recovering fatigue of the shoulder muscles, and the shoulder stretch operation can be sufficiently performed.

[Body support]
FIG. 6 is an operation explanatory diagram showing the lateral G hold property when the lateral G acts on the occupant seated on the vehicle seat of the first embodiment. Hereinafter, based on FIG.6 and FIG.3, the body support effect | action of Example 1 is demonstrated.

  In the vehicle seat 1 of the first embodiment, the coefficient of restitution of the first support portion 21B of the main support portion 21 that supports the scapula 32a and the lower corner 32b of the scapula 32 of the seated occupant 30 is set in the main support portion 21. It is set to a value that is higher than the restitution coefficient of the center support portion 21 </ b> A and is lower than the restitution coefficient of the second support portion 22 </ b> A set to the side support portion 22. That is, in the main support portion 21, the hardness of the upper part of the vehicle facing the scapula 32 is relatively higher than the hardness of the lower part of the vehicle.

As a result, even if the occupant 30 seated on the seat cushion portion 10 puts weight on the rear of the vehicle and a pressing force acts on the seat back portion 20, the seat back portion 20 is easily deformed by the pressing force. Can be prevented, and the occupant 30 can be stably supported.
In particular, the pressing force around the scapula 32 is larger than the pressing force due to the waist near the seat cushion portion 10. However, since the coefficient of restitution of the first support portion 21B that supports the scapula 32 is harder than that of the central support portion 21A, the first support portion 21B can be stably supported even if the pressing force is large. In other words, the posture retainability of the occupant 30 seated on the vehicle seat 1 can be ensured.

  Further, in the first embodiment, the coefficient of restitution of the second support portion 22A of the side support portion 22 that supports the thoracic side portion 33a in the vicinity of the seventh to ninth thoracic vertebrae of the seated occupant 30 is set in the main support portion 21. Further, the coefficient of restitution of the central support portion 21 </ b> A and the first support portion 21 </ b> B and the value of the restitution coefficient of the third support portion 22 </ b> B set to the side support portion 22 are set higher. That is, the second support portion 22 </ b> A is a region having the highest coefficient of restitution among the side support portions 22.

Here, when the acceleration G (lateral G) in the vehicle lateral direction acts on the occupant 30 seated on the seat cushion portion 10 and the body of the occupant 30 moves in the vehicle width direction, as shown in FIG. The chest side surface 35 contacts the second support portion 22 </ b> A of the side support portion 22.
At this time, since the second support portion 22A is the region with the highest coefficient of restitution, even if the chest side surface 35 contacts the second support portion 22A, the second support portion 22A is not easily deformed.
As a result, the chest side surface 35 of the occupant 30, that is, the thorax side surface portion 33a near the seventh thoracic vertebra to the ninth thoracic vertebra is supported by the second support portion 22A, and so-called lateral G-holding property can be ensured.

In addition, here, the coefficient of restitution of the second support portion 22A is set to a value higher than that of the first support portion 21B set to the main support portion 21. For this reason, it is possible to prevent the first support portion 21B from becoming unnecessarily hard, and when the occupant 30 moves in the vehicle width direction due to the lateral G, the occupant 30 is stably supported, and at the time of normal seating Deterioration of sitting comfort can be prevented.
That is, when the occupant 30 moves in the vehicle width direction due to the lateral G, a pressing force greater than the force of the occupant 30 acts on the second support portion 22A that contacts the occupant 30. On the other hand, a pressing force by the occupant 30 acts on the first support portion 21B that supports the back of the seated occupant 30, and it is difficult for more force to be applied. Therefore, even if the restitution coefficient of the first support portion 21B is set to a value lower than that of the second support portion 22A, the posture retention is not impaired.

Next, the effect will be described.
In the vehicle seat of the first embodiment, the effects listed below can be obtained.

(1) In the vehicle seat 1 comprising: a seat cushion portion 10 on which an occupant sits; and a seat back portion 20 that stands on the rear side of the seat cushion portion 10 and supports the occupant.
The seat back portion 20 is provided on the left and right sides of the main support portion 21 at the center in the vehicle width direction, and a pair of side support portions 22 and 22 projecting forward of the vehicle from the main support portion 21. And having
The main support portion 21 sets a center support portion 21A at the center portion in the vehicle vertical direction, and sets a first support portion 21B above the center support portion 21A.
The side support portion 22 sets a second support portion 22A at a lateral position of the central support portion 21A, and sets a third support portion 22B at an upper position of the second support portion 22A.
The hardness of the first support portion 21B and the second support portion 22A is set to a higher value than the central support portion 21A,
The hardness of the third support portion 22B is set to a value lower than that of the central support portion 21A.
Thereby, it is possible to easily perform the stretching operation of the shoulder while ensuring the posture retaining property and the lateral G-holding property of the occupant seated on the seat cushion portion 10.

(2) The hardness of the second support portion 22A is set to a value higher than that of the first support portion 21B.
Thereby, in addition to the effect of (1), the lateral G hold property of the seated occupant can be improved.

(3) The first support portion 21B is set in a region that supports the scapula 32a and the lower corner 32b of the scapula 32 of the occupant 30 seated on the seat cushion portion 10,
The second support portion 22A is set in a region that supports the thoracic side portion 33a of the occupant 30,
The third support portion 22B is configured to be set in a region in contact with the upper arm portion 34 of the occupant 30.
Thereby, in addition to the effect of (1) or (2), an appropriate part of the seated occupant 30 can be supported, and the side support part 22 does not get in the way when the shoulder is stretched. can do.

(Example 2)
Example 2 is an example in which the hardness is varied for each support portion by providing a slit in the seat pad.

  FIG. 7 is an explanatory diagram illustrating a configuration of a seat back portion of the vehicle seat according to the second embodiment. Hereinafter, based on FIG. 7, the vehicle seat of Example 2 is demonstrated. In addition, about the structure equivalent to Example 1, the code | symbol same as Example 1 is attached | subjected and detailed description is abbreviate | omitted.

As shown in FIG. 7, the vehicle seat 1 </ b> A according to the second embodiment includes a main support portion 41 at the center in the vehicle width direction, and a pair of side support portions 42 and 42 provided on the left and right sides of the main support portion 41. The seat back part 40 which has is provided.
In the main support portion 41, a central support portion 41A is set at a central portion in the vehicle vertical direction, and a first support portion 41B is set above the central support portion 41A.
In the side support portion 42, a second support portion 42A is set at a side position of the central support portion 41A, and a third support portion 42B is set at an upper position of the second support portion 42A.

The restitution coefficient (hardness) of the first support portion 41B is equal to the restitution coefficient of the central support portion 41A set on the main support portion 41, and the restitution coefficient of the second support portion 42A set on the side support portion 42. The value is set lower than the coefficient. Further, the restitution coefficient (hardness) of the second support part 42A is the restitution coefficient of the center support part 41A and the first support part 41B set in the main support part 41, and the third support part 42B set in the side support part 42. It is set to a value higher than the coefficient of restitution.
The restitution coefficient (hardness) of the third support portion 42B is the restitution coefficient of the central support portion 41A and the first support portion 41B set in the main support portion 41, and the second support portion 42A set in the side support portion 42. Is set to a value lower than the coefficient of restitution.

That is, the value of the coefficient of restitution (hardness) of each of the support portions 41A, 41B, 42A, and 42B in the seat back portion 40 is expressed by the following equation (2).
3rd support part 42B <center support part 41A = 1st support part 41B <2nd support part 42A ... (2)

Further, in the second embodiment, in order to make the restitution coefficients of the support portions 41A, 41B, 42A, and 42B different, as shown in FIG. 7, the center support portion 41A, the first support portion 41B, and the third support portion 42B. A slit is provided in a sheet pad forming each of the above.
Here, the central support portion 41A and the first support portion 41B are provided with a relatively small first slit S1 having the same size. On the other hand, the third support portion 42B is provided with a second slit S2 having a larger width and length than the first slit S1.
Thereby, the slit area per unit area in the 3rd support part 42B becomes larger than the slit area per unit area in 41 A of 1st support parts and the 1st support part 41B. Here, the “slit area” is an opening area generated by the first slit S1 or the second slit S2.

  As a result, the larger the slit area per unit area, the wider the opening area, so that the coefficient of restitution can be reduced. In the second embodiment, the same seat pad can be used, and there is no need to change the material of the seat pad for each support portion.

Example 3
Example 3 is an example in which the hardness is varied for each support portion by increasing the seat frame.

  FIG. 8A is an explanatory diagram showing the configuration of the seat back portion of the vehicle seat of the third embodiment, and FIG. 8B shows the seat frame of the seat back portion of the vehicle seat of the third embodiment. It is a perspective view. Hereinafter, based on FIG. 8, the vehicle seat of Example 3 is demonstrated. In addition, about the structure equivalent to Example 1, the code | symbol same as Example 1 is attached | subjected and detailed description is abbreviate | omitted.

As shown in FIG. 8 (a), the vehicle seat 1B according to the third embodiment includes a main support portion 51 at the center in the vehicle width direction and a pair of side support portions 52 provided on the left and right sides of the main support portion 51. 52. The seat back part 50 which has 52. is provided.
In the main support portion 51, a central support portion 51A is set at a central portion in the vehicle vertical direction, and a first support portion 51B is set above the central support portion 51A.
In the side support portion 52, a second support portion 52A is set at a side position of the central support portion 51A, and a third support portion 52B is set at an upper position of the second support portion 52A.

The hardness of the first support portion 51B is equal to the hardness of the central support portion 51A set to the main support portion 51, and is lower than the hardness of the second support portion 52A set to the side support portion 52. Is set to Further, the hardness of the second support portion 52A is higher than the hardness of the central support portion 51A and the first support portion 51B set in the main support portion 51 and the hardness of the third support portion 52B set in the side support portion 52. Is set to a value.
And the hardness of the 3rd support part 52B is lower than the hardness of the center support part 51A set to the main support part 51 and the 1st support part 51B, and the hardness of the 2nd support part 52A set to the side support part 52. Is set to a value.

That is, the values of the hardness (hardness) of the support portions 51A, 51B, 52A, 52B in the seat back portion 50 are represented by the following formula (3).
Third support portion 52B <center support portion 51A = first support portion 51B <second support portion 52A (3)

Further, in the third embodiment, in order to vary the hardness of each support portion 51A, 51B, 52A, 52B, as shown in FIG. 8B, in the seat frame F constituting the seat back portion 50, the occupant ( A reinforcing wire 53 for supporting the lower side of the trunk from the side of the rib cage near the seventh thoracic vertebra to the ninth thoracic vertebra is added. In addition, 54 in FIG.8 (b) is a pad support plate.
Further, the hardness of the seat pad (not shown) in the third support portion 52B is lowered.

  Thereby, even if the seat pad rigidity (repulsion coefficient) of the main support portion 51 and the second support portion 52A is the same, the hardness of the second support portion 52A can be increased, and the lateral width of the vehicle seat 1B can be increased. G hold property can be improved.

  As mentioned above, although the vehicle seat of this invention has been demonstrated based on Example 1-3, it is not restricted to these Examples about a concrete structure, Each claim of a claim Design changes and additions are allowed without departing from the gist of the invention.

In the first embodiment, the hardness of each of the support portions 21A, 21B, 22A, and 22B set in the seat back portion 20 is set in order from the lowest, the third support portion 22B, the center support portion 21A, the first support portion 21B, 2 shows an example of setting so as to be 22A support portions. Further, in the second embodiment, the hardness of each support portion 41A, 41B, 42A, 42B set in the seat back portion 40 is set in order from the lowest, the third support portion 42B, the central support portion 41A and the first support portion 41B, The example which sets so that it may become the 2nd support part 42A was shown.
However, the present invention is not limited to this. The hardness of the central support portion 21A, the first support portion 21B, and the second support portion 22A may be set to an equivalent value, and only the hardness of the third support portion 22B may be set to a low value. In this case, since only the hardness of the 3rd support part 22B which a passenger | crew's upper arm part contacts should just differ, the vehicle seat 1 can be made easy to form.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 10 Seat cushion part 12 Headrest 20 Seat back part 21 Main support part 21A Center support part 21B 1st support part 22 Side support part 22A 2nd support part 22B 3rd support part 30 Crew 31 Center of gravity 32 Scapula 32a Scapula Barb 32b Lower corner 33a Thorax side 34 Upper arm

Claims (3)

In a vehicle seat comprising: a seat cushion portion on which an occupant sits; and a seat back portion that stands on the rear side of the seat cushion portion and supports the occupant;
The seat back portion includes a main support portion at a vehicle width direction center portion, and a pair of side support portions provided on the left and right sides of the main support portion and projecting forward of the vehicle from the main support portion,
The main support part sets a center support part at a center part in the vehicle vertical direction, sets a first support part above the center support part,
The side support part sets a second support part at a side position of the central support part, sets a third support part at an upper position of the second support part,
The hardness of the first support part and the second support part is set to a value equal to or higher than that of the central support part,
The vehicle seat, wherein the hardness of the third support portion is set to a value lower than that of the central support portion. The vehicle seat according to claim 1,
The vehicle seat, wherein the hardness of the second support portion is set to a value equal to or higher than that of the first support portion. In the vehicle seat according to claim 1 or 2,
The first support portion is a region that supports the scapula spine and the lower angle of the scapula of the occupant seated on the seat cushion portion,
The second support portion is a region that supports the thoracic side portion of the occupant,
The vehicle seat, wherein the third support portion is a region that contacts an upper arm portion of the occupant.