JP2017105400A - Seat structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a seat structure for a vehicle which can reduce fatigue at long-time seating.SOLUTION: A seat structure for a vehicle has: a seat cushion frame 16; a planar member 44 which is formed into a substantially-triangular shape in a vehicle plane face view, and supports a load applied to a seat cushion 14; first regions 60 which are arranged in a pair in left and right parts with a virtual line X passing a center of the planar member 44 as a center, and whose spring constants are set smaller than that of a general part 68 of the planar member 44; a second region 62 which is opened toward a vehicle front side in the vehicle plane face view, formed into a substantial U-shape, and whose spring constant is set smaller than that of the general part 68 of the planar member 44, and larger than that of the first region 60; and a third region 64 which is formed into a substantial U-shape in the vehicle plane face view along a vehicle rear sideway 63 of the second region 62 in the planar member 44, and whose spring constant is set larger than that of the general part 68 of the planar member 44.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle seat structure.

  The following Patent Document 1 discloses a vehicle seat. The vehicle seat corresponds to a first human body support portion having a center at a position corresponding to a substantially central portion of a pair of sciatics of a pair of occupants in a seat cushion on which the occupant is seated, and the vicinity of the base of the thigh of the occupant. And a second human body support portion disposed on the vehicle front side from the single body support portion. The first human body support portion and the second human body support portion have different spring constants by changing the arrangement of coil springs, auxiliary planar support members, and the like. That is, the seat cushion has different spring constants in the vehicle longitudinal direction. Thereby, the stability at the time of static seating and the improvement of vibration absorption are achieved.

JP 2012-176330 A

  By the way, when an occupant sits on a vehicle seat for a long time, the occupant may be fatigued due to numbness at the bottom. Numbness occurs because when the user sits down, the hips are pressed and blood flow is worsened. In other words, if the seat cushion has a high seating pressure when seated, the buttocks are pressed more, so it is desirable to reduce the seating pressure in order to suppress numbness. In order to reduce the seat pressure, a configuration in which the spring constant of the support member of the seat cushion is changed can be considered. And since the seating pressure changes with the site | parts in a hip part, it is necessary to change a spring constant correspondingly. However, in the configuration disclosed in Patent Document 1, since the spring constant of the seat cushion is changed in the vehicle front-rear direction, the seat pressure is changed in the vehicle front-rear direction. Therefore, the seating pressure cannot be changed sufficiently according to the site in the buttocks, and as a result, the buttocks cannot be compressed. Therefore, the above prior art has room for improvement in this respect.

  In view of the above problems, an object of the present invention is to provide a vehicle seat structure that can reduce fatigue in sitting for a long time.

  According to a first aspect of the present invention, a vehicle seat structure includes a frame-like seat cushion frame constituting a skeleton of a seat cushion on which an occupant is seated, a substantially rectangular shape in a vehicle plan view, and the seat cushion frame. A pair of left and right members centering on a virtual line along the vehicle front-rear direction passing through the center of the planar member, and a flexible planar member that supports the load applied to the seat cushion by the surface. And a first part that is formed in a substantially circular shape in plan view of the vehicle and has a smaller spring constant than the general part of the planar member, and is arranged so as to surround the first part, and in plan view of the vehicle And a second part having a spring constant smaller than that of the general part of the planar member and larger than that of the first part. Previous A third portion of the planar member that is formed in a substantially U shape in a plan view of the vehicle along the rear portion of the second portion of the planar member and has a larger spring constant than the general portion of the planar member. And have.

  According to the first aspect of the present invention, the planar member is provided in the frame of the seat frame. When an occupant sits on the seat cushion, the load of the occupant is supported by the planar member. The planar member is provided with a first part, a second part, and a third part. The first part is arranged in a pair of left and right with a virtual line along the vehicle front-rear direction passing through the center of the planar member as a center, and is formed in a substantially circular shape in a vehicle plan view. Therefore, when the occupant sits on the seat cushion, a portion corresponding to the pair of left and right sciatic bones in the butt portion of the occupant is disposed at a position corresponding to the first portion in the seat cushion.

  Further, the second part is disposed so as to surround the first part, and is formed in a substantially U-shape that opens toward the front side of the vehicle in a plan view of the vehicle. Accordingly, a portion corresponding to the tailbone located at the approximate center of the pair of left and right sciatuses in the butt portion of the occupant seated on the seat cushion, and a thigh located approximately on the vehicle front side from the sciatal bone correspond to the second portion of the seat cushion. Placed in position.

  Furthermore, the third part is formed in a substantially U shape in a plan view of the vehicle along a portion of the planar member on the vehicle rear side of the second part. Therefore, the rear portion of the butt portion of the occupant seated on the seat cushion is disposed at a position corresponding to the third portion of the seat cushion.

  In general, a tactile site at the center of the pair of sciatic bones is relatively sensitive to the tactile sensation, but a rear part of the buttocks is relatively insensitive to the tactile sensation. In addition, the thigh becomes more sensitive to touch as it goes to the knee. That is, a sensitive part is likely to feel numbness due to deterioration of blood flow. On the other hand, since the sciatic bone in the butt portion of the occupant is arranged so as to protrude downward in the vehicle in the seated state, when the occupant is seated, the seating pressure at the site centering on the sciatic portion in the butt portion is highest. And in the site | part with a high seat pressure, the numbness due to the deterioration of blood flow is easy to occur. Based on these, in the present invention, the first part arranged in the part corresponding to the sciatica is set to have a smaller spring constant than the general part of the planar member. Therefore, since the first part is more easily bent than the general part of the planar member, it is possible to reduce the sitting pressure at the part corresponding to the sciatic bone where the normal sitting pressure is increased. In addition, since the second part has a spring constant larger than that of the first part and a spring constant smaller than that of the general part of the planar member, the second part is less likely to bend than the first part and the general of the planar member. It is easier to bend than the part. Therefore, it is possible to reduce the seat pressure while supporting the part corresponding to the coccyx and the thigh where the sense of touch is relatively sensitive. Apart from this, in the rear part of the buttocks where the sense of touch is relatively insensitive, even if the seat pressure is set relatively high, it is difficult for the occupant to feel numbness, so the third part spring corresponding to the rear part of the buttocks By setting the constant larger than the spring constant of the general part of the planar member, supporting the occupant's buttocks so that the posture of the occupant is appropriate while lowering the seating pressure of other parts where the sense of touch is sensitive Is possible. That is, by setting the seat pressure in accordance with the characteristics of each part in the butt portion of the occupant, the seat pressure in the entire butt portion can be lowered while reliably supporting the seated occupant. Thereby, it becomes possible to suppress the pressure of the butt portion of the passenger seated for a long time.

  The vehicle seat structure according to the first aspect of the present invention has an excellent effect of being able to reduce fatigue in sitting for a long time.

It is a schematic perspective view which shows the frame | skeleton etc. of the vehicle seat provided with the vehicle seat structure which concerns on one Embodiment. It is sectional drawing which shows the state which looked at the seat cushion of the vehicle seat provided with the vehicle seat structure which concerns on one Embodiment from the vehicle side surface. It is a top view which shows the planar member in the vehicle seat structure which concerns on one Embodiment.

  Hereinafter, an embodiment of a vehicle seat structure according to the present invention will be described with reference to FIGS. In these figures, the arrow FR indicates the front side in the vehicle longitudinal direction, the arrow OUT indicates the vehicle width direction outside, and the arrow UP indicates the vehicle vertical direction upper side.

  FIG. 1 shows a vehicle seat 10 provided in a vehicle compartment of the vehicle. The vehicle seat 10 includes a seat frame 12 that forms a skeleton. The seat frame 12 constitutes a seat cushion frame 16 that constitutes a seat cushion 14 that is a seating surface, and a seat back 18 that is a backrest, and rotates about the vehicle width direction toward the vehicle rear end side of the seat cushion frame 16. And a seat back frame 20 supported in a possible manner. In the drawing, the seat cushion pad 46 of the seat cushion 14 and the seat back pad of the seat back 18 are not shown for explaining the internal structure of the vehicle seat 10.

  The seat back frame 20 extends in a substantially vehicle width direction integrally connecting a pair of back side frames 22 that are spaced apart in the seat width direction and ends of the pair of back side frames 22 on the vehicle upper side. And a lower frame 26 that extends in the vehicle width direction and connects the ends of the pair of back side frames 22 on the vehicle lower side. The seat back frame 20 is attached to the lower end side of the vehicle so as to be rotatable about a shaft 28 that extends in the vehicle width direction on the rear end side of the seat cushion frame 16. Thereby, the reclining device (not shown) can be operated to recline the seat back 18. The upper frame 24 of the seat back frame 20 is formed with two headrest mounting holes 30 that are opened to the vehicle upper side where a headrest (not shown) is inserted and held, spaced apart in the seat width direction.

  The seat cushion frame 16 includes a pair of cushion side frames 32 that are spaced apart in the seat width direction, a front frame 34 that connects ends of the pair of cushion side frames 32 on the vehicle front side, and a pair of cushion side frames. The first connection frame 36 and the second connection frame 38 extending in the vehicle width direction connecting the 32 to each other. The first connection frame 36 is formed in a substantially cylindrical shape with the vehicle width direction as an axial direction (see FIG. 2), and is disposed in the vicinity of the front frame 34.

  Similar to the first connection frame 36, the second connection frame 38 is formed in a substantially cylindrical shape having the vehicle width direction as an axial direction (see FIG. 2), and is disposed on the vehicle rear side of the cushion side frame 32. Yes. In other words, the first connection frame 36 and the second connection frame 38 are spaced apart from each other in the vehicle front-rear direction. With the above-described configuration, the seat cushion frame 16 is formed in a substantially rectangular frame shape in a vehicle plan view.

  A seat slide rail 40 is provided on the vehicle lower side of the seat cushion frame 16. A pair of seat slide rails 40 are provided in the seat width direction so as to correspond to the cushion side frame 32, and the seat cushion frame 16 and thus the vehicle seat 10 can be moved along the vehicle front-rear direction. .

  A planar member 44 is attached to the first connection frame 36 and the second connection frame 38 in the seat cushion frame 16 so as to be bridged. The planar member 44 is made of a flexible cloth material as an example, and is formed in a substantially rectangular shape whose longitudinal direction is the vehicle front-rear direction in plan view of the vehicle. Further, the dimension of the planar member 44 in the seat width direction is set smaller than the dimension from one cushion side frame 32 to the other cushion side frame 32 in the seat cushion frame 16. Thus, the planar member 44 is provided in the frame of the seat cushion frame 16. As shown in FIG. 2, the planar member 44 is disposed on the vehicle lower side of the seat cushion pad 46 that is disposed on the vehicle upper side of the seat cushion frame 16 and has elasticity made of urethane resin or the like. The load applied to the lower side of the vehicle via the seat cushion pad 46 is supported by the surface.

  An end 48 on the vehicle front side of the planar member 44 is fastened to the first connection frame 36 by a bolt 50. Specifically, the end portion 48 is formed by an upper holding bracket 52 disposed on the vehicle upper side of the planar member 44 and a lower clamping bracket 54 disposed on the vehicle lower side of the planar member 44. It is pinched in the vertical direction of the vehicle. The upper sandwiching bracket 52 and the lower sandwiching bracket 54 are formed in an approximately L shape in a side view of the vehicle, and are formed in an arc shape so that the corners are along the outer periphery of the first connection frame 36. . The upper holding bracket 52, the lower holding bracket 54, the planar member 44, and the first connection with the corners of the lower holding bracket 54 in contact with the vehicle upper side of the first connection frame 36. The planar member 44 is attached to the first connection frame 36 by inserting bolts 50 into fastening holes (not shown) penetrating along the vehicle vertical direction, which are respectively formed in advance in the frame 36, and fastening them. . A retaining member 56 is attached to the front edge of the planar member 44. As a result, the front edge of the planar member 44 is prevented from coming off between the upper holding bracket 52 and the lower holding bracket 54. Further, at the end portion 48 of the planar member 44 on the vehicle front side, three fastening structures to the first connection frame 36 described above are provided apart from each other in the seat width direction. That is, three end portions 48 of the planar member 44 on the vehicle front side are fastened to the first connection frame 36.

  The end portion 58 on the vehicle rear side of the planar member 44 is sandwiched between the upper sandwiching bracket 52 and the lower sandwiching bracket 54 as well as the end portion 48 on the vehicle front side, and the lower sandwiching bracket. 54 is brought into contact with the second connecting frame 38, and the bolt 50 is inserted in the substantially vertical direction of the vehicle and fastened to be attached to the second connecting frame 38. Note that a retaining member 56 is attached to the rear edge of the planar member 44 in the same manner as the front edge, and the rear edge of the planar member 44 is between the upper sandwiching bracket 52 and the lower sandwiching bracket 54. It is restrained from leaving. Further, at the end portion 58 on the vehicle rear side of the planar member 44, three fastening structures to the second connection frame 38 described above are provided apart from each other in the seat width direction. That is, the end portion 58 of the planar member 44 on the vehicle rear side is fastened to the second connection frame 38 at three locations.

As shown in FIG. 3, the planar member 44 is provided with a first part 60, a second part 62, and a third part 64. As an example, the first portion 60 is configured to have a plurality of through holes (not shown) that are penetrated in the plate thickness direction of the planar member 44, and a pair of right and left in the buttocks B when the occupant P is seated on the seat cushion 14. Is located at a position corresponding to the sciatic bone IB (see FIG. 2). That is, the first portion 60 is a substantially central portion 66 in the vehicle front-rear direction in the planar member 44.
And a pair of left and right are arranged around a virtual line X along the vehicle front-rear direction passing through the center in the seat width direction, and is formed in a substantially circular shape in a vehicle plan view. Specifically, each of the first portions 60 is formed in a substantially elliptic shape and the longitudinal direction is inclined toward the vehicle front side and the seat width direction inner side.

  Moreover, since the 1st site | part 60 is set as the structure which has several through-holes, if a load is applied to a surface normal direction, it will be easy to deform | transform to the vehicle downward side. That is, the first part 60 has a smaller spring constant than the general part 68 that is a part other than the first part 60, the second part 62, and the third part 64 in the planar member 44.

  The second portion 62 includes a tailbone (not shown) located at the approximate center between the pair of left and right sciatic bones IB in the buttocks B when the occupant P is seated on the seat cushion 14 and the vehicle front side of the buttocks B (sciatica IB). It arrange | positions in the position corresponding to the thigh F which is located. That is, the second part 62 is disposed so as to surround the vehicle front-rear direction center part 66 and the first part 60 in the planar member 44, and is substantially U-shaped opening toward the front side of the vehicle in a plan view of the vehicle. It is formed in a shape. In addition, the second portion 62 is configured to have a plurality of through holes (not shown) that are penetrated in the plate thickness direction of the planar member 44 as an example, but the number thereof is smaller than that of the first portion 60 (units). The number of through holes per area is small). Therefore, the second portion 62 is more easily deformed than the general portion 68 of the planar member 44 and less likely to be deformed than the first portion 60 when a load is applied in the direction perpendicular to the surface. That is, the second portion 62 has a smaller spring constant than the general portion 68 of the planar member 44 and a larger spring constant than the first portion 60.

  The third portion 64 is disposed at a position corresponding to the rear portion BB (see FIG. 2) of the buttocks B when the occupant P is seated on the seat cushion 14. That is, the third portion 64 is formed in a substantially U shape in a vehicle plan view along the vehicle rear side portion 63 as a portion of the second portion 62 on the vehicle rear side. Moreover, this 3rd site | part 64 is set as the structure which piled up the cloth material as an example. Therefore, the third portion 64 is less likely to be deformed than the general portion 68 of the planar member 44 when a load is applied in the direction perpendicular to the plane. That is, the third portion 64 has a larger spring constant than the general portion 68 of the planar member 44.

  Next, the operation and effect of this embodiment will be described.

  In the present embodiment, as shown in FIG. 1, a planar member 44 is provided in the frame of the seat frame 12. As shown in FIG. 2, when the occupant P is seated on the seat cushion 14, the load of the occupant P is supported by the planar member 44. As shown in FIG. 3, the planar member 44 is provided with a first part 60, a second part 62, and a third part 64. The first portions 60 are arranged in a pair of left and right with a virtual line X along the vehicle longitudinal direction passing through the center of the planar member 44 as a center, and are formed in a substantially circular shape in a vehicle plan view. Therefore, when the occupant P is seated on the seat cushion 14, a portion corresponding to the sciatic IB in the hip B of the occupant P is disposed at a position corresponding to the first portion 60 in the seat cushion 14.

  The second portion 62 is disposed so as to surround the first portion 60 and is formed in a substantially U shape that opens toward the front side of the vehicle in a plan view of the vehicle. Accordingly, the portion corresponding to the tailbone (not shown) located at the approximate center of the pair of left and right sciatic bones IB in the butt B of the occupant P seated on the seat cushion 14 and the thigh F located substantially on the vehicle front side from the sciatic bone IB The cushion 14 is disposed at a position corresponding to the second portion 62.

  Further, the third portion 64 is formed in a substantially U shape in the vehicle plan view along the vehicle rear side portion 63 of the second portion 62 in the planar member 44. Accordingly, the rear portion BB of the butt portion B of the occupant P seated on the seat cushion 14 is disposed at a position corresponding to the third portion 64 of the seat cushion 14.

  In general, the tactile site at the center of the pair of sciatic bones IB is relatively sensitive to the tactile sensation, but the rear part of the buttocks B (the rear part BB) is relatively insensitive to tactile sensation. It is. Further, the thigh F becomes more sensitive to touch as it goes to the knee. That is, a sensitive part is likely to feel numbness due to deterioration of blood flow. On the other hand, the sciatic bone IB in the butt portion B of the occupant P is disposed so as to protrude downward in the vehicle in the seated state. Is the highest. And in the site | part with a high seat pressure, the numbness due to the deterioration of blood flow is easy to occur. Based on these, in the present embodiment, the first part 60 arranged at the part corresponding to the sciatica IB is set to have a smaller spring constant than the general part 68 of the planar member 44. Therefore, since the first portion 60 is more easily bent than the general portion 68 of the planar member 44, it is possible to reduce the seating pressure at the portion corresponding to the sciatic IB where the seating pressure normally increases. Further, since the second portion 62 has a spring constant larger than that of the first portion 60 and smaller than that of the general portion 68 of the planar member 44, it is less likely to bend than the first portion 60 and It is easier to bend than the general part 68 of the planar member 44. Therefore, it is possible to reduce the sitting pressure while supporting the part corresponding to the coccyx and the thigh F where the tactile sense is relatively sensitive. Apart from this, in the rear part BB of the buttocks B where the sense of touch is relatively insensitive, the occupant P is unlikely to feel numbness even if the seat pressure is set to be relatively high, and thus corresponds to the rear part BB of the buttocks B. By setting the spring constant of the third part 64 to be larger than the spring constant of the general part 68 of the planar member 44, the posture of the occupant P is made appropriate while lowering the seating pressure of other parts sensitive to the tactile sense. It is possible to support the butt B of the occupant P. That is, by setting the seat pressure in accordance with the characteristics of each part in the butt portion B of the occupant P, the seat pressure in the entire butt portion B can be lowered while reliably supporting the seated occupant P. Thereby, it becomes possible to suppress the compression of the buttocks B of the occupant P seated for a long time. For these reasons, fatigue in sitting for a long time can be reduced.

  In addition, in this embodiment, although the planar member 44 is comprised with the cloth material, it may not be restricted to this but may be comprised with other materials, such as an iron spring and urethane.

  Moreover, although the 1st site | part 60 and the 2nd site | part 62 are set as the structure which has multiple through-holes penetrated in the plate | board thickness direction of the planar member 44, not only this but 1st site | part 60 itself is a hole. It is good also as a formed structure, and the 1st site | part 60 and the 2nd site | part 62 may be comprised by another cloth with a small spring constant with respect to the general part 68 of the planar member 44. FIG. Further, other configurations may be used as long as the spring constant is small with respect to the general portion 68 of the planar member 44. Similarly, the third portion 64 has a configuration in which a plurality of cloth materials are stacked. However, the configuration is not limited to this, and other configurations are possible as long as the spring constant is large with respect to the general portion 68 of the planar member 44. Also good.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above, and various modifications other than those described above can be implemented without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 14 Seat cushion 16 Seat cushion frame 44 Planar member 60 1st site | part 62 2nd site | part 63 Vehicle rear side part (part of vehicle rear side of 2nd site | part)
64 Third part 68 General part P Crew X Virtual line

Claims (1)

A frame-shaped seat cushion frame that constitutes a skeleton of a seat cushion on which an occupant sits;
A planar member that is formed in a substantially rectangular shape in plan view of the vehicle, is provided within a frame of the seat cushion frame, and has a flexibility to support a load applied to the seat cushion by the surface;
A pair of left and right are arranged centering on an imaginary line along the vehicle longitudinal direction passing through the center of the planar member and are formed in a substantially circular shape in plan view of the vehicle, and the spring constant is made smaller than the general part of the planar member. A first part that is
The first portion is disposed so as to surround the first portion, and is formed in a substantially U shape that opens toward the front side of the vehicle in a plan view of the vehicle, and has a smaller spring constant than the general portion of the planar member and the first portion. A second part having a larger spring constant than the part;
A third U is formed in a substantially U shape in a plan view of the vehicle along the vehicle rear side portion of the second part of the planar member, and the spring constant is larger than the general part of the planar member. The site,
A vehicle seat structure comprising:

Images