Seat structure for vehicle

Abstract

The invention provides a seat structure for a vehicle. A vehicle seat structure is provided with: a seat back main body which extends in the seat width direction and the seat vertical direction and which is capable of supporting the back of an occupant; and a center reaction force application part which is provided at a position where the back of the occupant comes into contact in the center of the seat back body in the seat width direction, and which is capable of applying a reaction force toward the upper side of the seat with respect to the back of the occupant that comes into contact with the center reaction force application part.

Description

Technical Field

[0001] The present invention relates to a vehicle seat structure. Background Art

[0002] Japanese Patent Application Laid-Open No. 2021-112972 discloses a seat device including a main frame connected to a seat cushion via a tilt shaft, and a sub-frame that is swingable in a roll direction relative to the main frame. Summary of the Invention

[0003] In the structure described in Japanese Patent Application Laid-Open No. 2021-112972, the subframe is caused to swing according to the inertial force acting on the occupant during driving, thereby stabilizing the occupant's posture. However, due to its relatively complex structure, there is room for improvement in making it a popular vehicle seat.

[0004] An object of the present invention is to provide a vehicle seat structure that can stabilize the posture of an occupant during driving with a simple structure.

[0005] The vehicle seat structure involved in Technical Solution 1 includes: a seat back main body, which extends in the seat width direction and the seat up-down direction and can support the back of the occupant; a central reaction force applying portion, which is arranged at a position in the central portion of the seat back main body in the seat width direction for the occupant's back to contact, and can apply a reaction force toward the upper side of the seat to the occupant's back that contacts it.

[0006] The vehicle seat structure according to Technical Solution 1 includes a seat back body extending in the seat width direction and the seat vertical direction and capable of supporting the occupant's back. Furthermore, a central reaction force application portion is provided in the central portion of the seat back body in the seat width direction, where the occupant's back contacts the central reaction force application portion. The central reaction force application portion is configured to apply a reaction force upward to the seat against the occupant's back upon contact. As a result, when the occupant's upper body contacts the central reaction force application portion during driving, a reaction force is applied from the central reaction force application portion to the occupant's spine upward to the seat, thereby promoting the occupant's upright posture and stabilizing the seating position.

[0007] Furthermore, since the seating posture can be stabilized simply by applying a biasing reaction force toward the upper side of the seat to the seated occupant, a large-scale structure that swings a portion of the frame is unnecessary, and the seating posture can be stabilized with a simple structure.

[0008] The vehicle seat structure involved in technical solution 2 is as follows:

[0009] In claim 1, the outer reaction force applying portions are arranged side by side on both sides of the central reaction force applying portion in the seat width direction and can apply a reaction force toward the lower side of the seat to the back of the occupant that contacts the outer reaction force applying portion.

[0010] In the vehicle seat structure according to claim 2, the outer reaction force applying members apply a reaction force to the occupant's back toward the lower side of the seat. By applying biasing reaction forces in different vertical directions using the central reaction force applying member and the outer reaction force applying members, an upward reaction force is applied to the lumbar vertebrae and a downward force is applied to the ilium. As a result, when an external force in the seat width direction is applied to the occupant during vehicle cornering, the upper body moves outward. This allows the head to be guided inward by the characteristics of the spine, thereby maintaining the seated posture during cornering.

[0011] The vehicle seat structure involved in technical solution 3 is:

[0012] In the second embodiment, the seat back body includes an upper outer reaction force applying portion on the seat upper side of the outer reaction force applying portion. The upper outer reaction force applying portion can apply a reaction force toward the seat lower side to the back of the occupant that contacts the upper outer reaction force applying portion.

[0013] In the vehicle seat structure according to claim 3, when the occupant is a driver, the driver's steering operation during steering causes the upper body to be prone to rolling inward. Consequently, the inwardly-turned shoulder blades move rearward. Consequently, a deflection reaction force is applied to the inwardly-turned shoulder blades from the upper side reaction force application portion, which in turn encourages the occupant's upper body to roll inward. As a result, the occupant can adopt a body posture that can withstand the external forces applied during steering, thereby stabilizing the seated posture.

[0014] The vehicle seat structure involved in the fourth technical solution is:

[0015] In the second embodiment, the seat back body includes an upper outer reaction force applying portion on the seat upper side of the outer reaction force applying portion. The upper outer reaction force applying portion can apply a reaction force toward the seat upper side to the back of the occupant that contacts the upper portion.

[0016] In the vehicle seat structure according to claim 4, when the occupant is a passenger other than the driver sitting in the passenger seat or a rear seat, the occupant's upper body is prone to rolling outward during steering, causing the outwardly tilted shoulder blade to move rearward. Consequently, the outwardly tilted shoulder blade receives a deflection reaction force directed upward from the upper side reaction force application portion. This encourages the occupant to tilt inward, allowing them to adopt a body posture that can withstand the external forces during steering, thereby stabilizing their seating posture.

[0017] The vehicle seat structure according to the fifth technical solution is as follows:

[0018] In any one of claims 1 to 4, the central reaction force applying portion is configured to include a cushion pad having an S-shaped cross section when viewed in the seat width direction.

[0019] In the vehicle seat structure according to claim 5, the deflection reaction force is applied by the cushion pad having an S-shaped cross section, thereby stabilizing the seating posture with a simple structure. Furthermore, the direction of the applied deflection reaction force can be reversed simply by reversing the vertical orientation of the cushion pad.

[0020] As described above, according to the vehicle seat structure according to the present invention, the posture of the occupant during driving can be stabilized with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Features, advantages, technical and industrial significance of representative embodiments of the present invention will be described in the following drawings for reference, wherein like symbols indicate like elements.

[0022] Figure 1 It is an enlarged perspective view showing an enlarged view of a vehicle seat according to an embodiment.

[0023] Figure 2 This is an enlarged perspective view showing an enlarged view of the cushion pad in the embodiment.

[0024] Figure 3A as well as Figure 3B This is an enlarged cross-sectional view of the main part showing the cross section of the central lower section cushion. Figure 3A The no-load condition is shown in Figure 3B The compressed state is shown in .

[0025] Figure 4A as well as Figure 4B This is a front view schematically showing a vehicle seat according to an embodiment. Figure 4A The vehicle seat is shown in FIG. Figure 4B: shows a vehicle seat arranged at the front passenger seat.

[0026] Figure 5 It shows the top view and rear view of the occupant in the driver's seat when turning left.

[0027] Figure 6 It shows the top view and rear view of the passenger in the front passenger seat when turning left.

[0028] Figure 7A This is a front view schematically showing a vehicle seat according to a first modified example. Figure 7B This is a front view schematically showing a vehicle seat according to a second modified example. Figure 7C It is a front view schematically showing a vehicle seat according to a third modified example.

[0029] Figure 8A This is an enlarged cross-sectional view of a main portion showing an enlarged cross section of the cushion pad in the fourth modified example. Figure 8B This is an enlarged cross-sectional view of a main portion showing an enlarged cross section of the cushion pad in the fifth modification.

[0030] Figure 9 This is a cross-sectional view schematically showing a cross section of the vehicle seat according to the sixth modified example when viewed in the seat width direction. DETAILED DESCRIPTION

[0031] A vehicle seat structure according to an embodiment will be described with reference to the drawings.

[0032] Figure 1 This is an enlarged perspective view of a vehicle seat 10 to which the vehicle seat structure according to the embodiment is applied. The arrows FR, UP, and RH in the figure respectively indicate the seat front, seat upper, and seat right directions of the vehicle seat 10. In the following description, when the terms "front-back," "up-down," or "left-right" are used without specific reference, these are assumed to indicate front-back in the seat front-back direction, up-down in the seat upper-lower direction, and left-right in the seat width direction.

[0033] like Figure 1 As shown, the vehicle seat 10 of this embodiment includes a seat cushion 12, a seat back 14, and a headrest 16. The seat cushion 12 extends in the seat front-to-back direction and the seat width direction and is configured to support the occupant's buttocks and thighs from below. Furthermore, the seat cushion 12 is supported by seat rails (not shown) and is configured to be movable in the front-to-back direction via the seat rails.

[0034] The rear end of the seat cushion 12 is connected to a seat back 14. The seat back 14 extends in the seat width direction and the seat vertical direction and is configured to support the occupant's back from behind. Furthermore, a headrest 16 is provided at the upper end of the seat back 14. The headrest 16 is configured to support the occupant's head from behind.

[0035] The seat back 14 is constructed to include a seat back body 18 and cushion pads 20. In this embodiment, six cushion pads 20 are arranged on the front surface of the seat back 14, as an example. The cushion pads 20 include an upper center cushion pad 20A and a lower center cushion pad 20B, which are arranged in the center portion in the seat width direction. The upper center cushion pad 20A and the lower center cushion pad 20B are provided in the center portion of the seat back body 18 in the seat width direction, where the occupant's back contacts the seat.

[0036] Furthermore, a right upper cushion pad 20C is disposed adjacent to the right of the center upper cushion pad 20A, and a right lower cushion pad 20D is disposed adjacent to the right of the center lower cushion pad 20B. Furthermore, a left upper cushion pad 20E is disposed adjacent to the left of the center upper cushion pad 20A, and a left lower cushion pad 20F is disposed adjacent to the left of the center lower cushion pad 20B.

[0037] Each of the six cushion pads 20 is detachably mounted on the seat back main body 18. For example, the cushion pads 20 can be attached to the seat back main body 18 by providing a frame (not shown) on the seat back main body 18 and inserting the cushion pads 20 into the frame. Alternatively, for example, a Velcro fastener can be provided on each of the seat back main body 18 and the cushion pads 20, enabling attachment and detachment using the Velcro fastener.

[0038] Figure 2 This is an enlarged perspective view showing the cushion pad 20 in this embodiment. In this embodiment, six cushion pads 20 are configured to have the same structure as an example.

[0039] like Figure 2 As shown, the cushion pad 20 is configured to include a first base plate portion 22 extending in the seat width direction and the seat vertical direction, and a second base plate portion 24 disposed opposite to the first base plate portion 22. Figure 2 As shown, the cushion pad 20 includes a connecting spring portion 26 connecting the first base portion 22 and the second base portion 24 in the seat longitudinal direction. The cushion pad 20 has a substantially S-shaped cross section when viewed in the seat width direction.

[0040] A plurality of through-holes 22A are formed in the first base plate portion 22. These through-holes 22A are formed in a substantially uniform shape, forming a substantially oblong shape with the seat width direction as the longitudinal direction. Five through-holes 22A are formed at equal intervals in the seat width direction. Furthermore, seven through-holes 22A are formed at equal intervals in the seat vertical direction.

[0041] The second base plate 24 has the same shape as the first base plate 22 and is spaced apart in the seat longitudinal direction from the first base plate 22. The second base plate 24 has a through hole 24A similar to that of the first base plate 22.

[0042] The connecting spring portions 26 are formed in eight positions spaced apart in the seat vertical direction, and each connecting spring portion 26 extends from one end portion of the cushion pad 20 in the seat width direction to the other end portion. Figure 2 The cushion pad 20 shown is a central lower cushion pad 20B. The connecting spring portion 26 of the central lower cushion pad 20B is formed into a generally S-shaped structure, curving upward from the first base plate portion 22 toward the second base plate portion 24 and then curving downward. Furthermore, a central reaction force applying portion is formed by including the central lower cushion pad 20B. Furthermore, the right lower cushion pad 20D and the left lower cushion pad 20F, arranged side by side on either side of the central lower cushion pad 20B in the seat width direction, constitute the outer reaction force applying portion.

[0043] Figure 3A as well as Figure 3B This is an enlarged cross-sectional view of the main part showing an enlarged cross section of the center lower cushion pad 20B. Figure 3A The no-load condition is shown in Figure 3B The compressed state is shown in Figure 3A In the state shown, when the first base plate portion 22 is pressed by the body P of the occupant while the second base plate portion 24 is fixed, the first base plate portion 22 is pressed toward Figure 3B That is, the connecting spring portion 26 is compressed and deformed, thereby shortening the distance between the first substrate portion 22 and the second substrate portion 24 .

[0044] Here, in Figure 3B In this state, a reaction force acts on the occupant's body from the first base plate portion 22 toward the front and upper side of the seat as indicated by the arrows in the drawing. That is, the center lower cushion pad 20B is configured to apply a reaction force toward the upper side of the seat to the occupant's back when it comes into contact with it.

[0045] Here, if the Figure 2If the cushion pad 20 is positioned in the opposite direction, the connection spring portion 26 will be oriented in the opposite direction. In this state, since the second base plate portion 24 is located on the passenger side, it is pressed toward the first base plate portion 22. This creates a reaction force from the second base plate portion 24 directed toward the front and below the seat, acting on the passenger. In other words, the structure allows the reaction force to be reversed simply by reversing the vertical position of the cushion pad 20.

[0046] exist Figure 4A as well as Figure 4B , a front view schematically showing the vehicle seat 10 according to the embodiment is shown. Figure 4A The vehicle seat is shown in FIG. Figure 4B : shows a vehicle seat arranged at the front passenger seat.

[0047] like Figure 4A As shown, in the vehicle seat 10 positioned at the driver's seat, the direction of the reaction force varies depending on the placement of the cushion pads 20. Specifically, the cushion pads 20 are installed so that the reaction force acts upward on the seat, with the center upper cushion pad 20A and center lower cushion pad 20B. In other words, the cushion pads 20 are installed so that the first base plate portion 22 is positioned toward the front of the seat.

[0048] The right upper cushion pad 20C and the right lower cushion pad 20D are mounted so that the reaction force acts downward on the seat.

[0049] As with the right upper cushion pad 20C and the right lower cushion pad 20D, the left upper cushion pad 20E and the left lower cushion pad 20F are attached with the cushion pads 20 oriented so that the reaction force acts toward the seat lower side.

[0050] Thus, in the vehicle seat 10 disposed at the driver's seat, the central lower cushion pad 20B constituting the central reaction force applying portion is configured to apply a reaction force to the occupant's back toward the upper side of the seat. Furthermore, the right lower cushion pad 20D and the left lower cushion pad 20F constituting the outer reaction force applying portions are configured to apply a reaction force to the occupant's back toward the lower side of the seat.

[0051] Furthermore, the right upper cushion pad 20C and the left upper cushion pad 20E, which are arranged above the seat of the right lower cushion pad 20D and the left lower cushion pad 20F, constitute an upper outer side reaction force applying portion. The upper outer side reaction force applying portion is configured to apply a reaction force toward the lower side of the seat to the back of the occupant that comes into contact therewith.

[0052] like Figure 4B As shown, in the vehicle seat 11 arranged at the passenger seat, the center upper cushion pad 20A and the center lower cushion pad 20B are mounted in such a direction that the reaction force acts toward the upper side of the seat.

[0053] The right upper cushion pad 20C is mounted so that the reaction force acts on the upper side of the seat, and the right lower cushion pad 20D is mounted so that the reaction force acts on the lower side of the seat. In other words, the cushion pads 20 are arranged so that the orientations of the cushion pads 20 can be changed by using the right upper cushion pad 20C and the right lower cushion pad 20D.

[0054] The left upper cushion pad 20E is mounted so that the reaction force acts on the upper side of the seat, and the left lower cushion pad 20F is mounted so that the reaction force acts on the lower side of the seat. In other words, the cushion pads 20 are arranged so that the orientations of the cushion pads 20 can be changed by using the left upper cushion pad 20E and the left lower cushion pad 20F.

[0055] Thus, in the vehicle seat 11 disposed at the passenger seat, the right upper cushion pad 20C and the left upper cushion pad 20E disposed above the seat of the right lower cushion pad 20D and the left lower cushion pad 20F constituting the outer reaction force applying portion constitute an upper outer reaction force applying portion. The upper outer reaction force applying portion is configured so as to apply a reaction force toward the upper side of the seat to the back of the occupant that comes into contact therewith.

[0056] effect

[0057] Next, the operation of the vehicle seat structure according to the present embodiment will be described.

[0058] In the vehicle seat structure according to this embodiment, Figure 1As shown, the seat back body 18 extends in the seat width direction and the seat vertical direction and is capable of supporting the passenger's back. In addition, a central lower section cushion pad 20B, which serves as a central reaction force application portion, is provided at the portion of the seat back body 18 in the central portion in the seat width direction where the passenger's back contacts. Here, the central lower section cushion pad 20B is constructed so as to apply a reaction force toward the upper side of the seat to the passenger's back that contacts it. Thus, when the passenger's back, especially the spine, contacts the central lower section cushion pad 20B while driving, a reaction force is applied from the central lower section cushion pad 20B to the passenger's spine toward the upper side of the seat. This promotes the passenger's upright waist posture and stabilizes the seating posture.

[0059] Furthermore, in this embodiment, the seated occupant's seated posture can be stabilized simply by applying a biasing reaction force toward the upper side of the seat. Therefore, a large-scale structure that causes a portion of the frame to swing is unnecessary, and the seated posture can be stabilized with a simple structure. In other words, the occupant's posture during driving can be stabilized with a simple structure.

[0060] Furthermore, in this embodiment, the right lower cushion pad 20D and the left lower cushion pad 20F, which constitute the outer reaction force applying portion, apply a reaction force to the occupant's back toward the lower side of the seat. By applying biased reaction forces in different vertical directions using the central reaction force applying portion and the outer reaction force applying portion, an upward reaction force is applied to the lumbar vertebrae and a downward force is applied to the ilium. As a result, when the vehicle turns and an external force in the seat width direction is applied to the occupant, the upper body can be moved outward. Furthermore, due to the characteristics of the spine, the head can be guided inward, resulting in a more stable seating posture.

[0061] The effect will be described below, for example, when turning left on a curve that turns to the left. When turning left, the occupant's upper body will move slightly toward the outside of the turn (to the right side of the seat). As a result, the reaction force from the center lower cushion 20B and the right lower cushion 20D generates a moment near the lumbar spine that tilts the pelvis. As a result, the spine is easily bent toward the inside of the turn (to the left side of the seat), generating a moment that supports the upper body on the inside of the turn. As a result, compared to a vehicle seat without a cushion 20, it is easier to maintain posture during turns.

[0062] In addition, in this embodiment, if Figure 4AAs shown, in the vehicle seat 10 disposed at the driver's seat, a reaction force is applied to the occupant's back (particularly near the shoulder blades) toward the lower side of the seat from the right upper cushion pad 20C and the left upper cushion pad 20E. This allows the driver to maintain a posture that can easily withstand the steering external force.

[0063] Regarding its function, use Figure 5 To explain. Figure 5 The top view and rear view of the passengers when the driver P1 turns left. Figure 5 As shown, in the case where the passenger is the driver, the driver P1 operates the steering device 100 when turning, so that the upper body PU1 is easily tilted to the inner side (left side of the seat). Therefore, the shoulder blade of the driver P1 on the inner side (left side of the seat) is further pressed against the seat back 14, and a biasing reaction force toward the lower side of the seat is input to the passenger from the left upper cushion 20E. As a result, by moving the upper body PU1 of the driver P1 in a manner close to the lower body PL1, it is possible to promote the tilting to the inner side (left side of the seat). That is, the body posture that can withstand the external force when turning left can be adopted, so that the sitting posture of the driver P1 can be stabilized.

[0064] On the other hand, Figure 4B As shown, in the vehicle seat 11 disposed at the passenger seat, a reaction force is applied to the occupant's back (particularly near the shoulder blades) toward the upper side of the seat from the right upper cushion pad 20C and the left upper cushion pad 20E. This allows the driver to maintain a posture that can easily withstand the steering external force.

[0065] Regarding its function, use Figure 6 To explain. Figure 6 It is a top view and a rear view of the passenger P2 sitting on the front passenger seat when turning left. Figure 6 As shown, if passenger P2 is a passenger other than the driver, passenger P2's upper body PU2 is prone to rolling outward (to the right side of the seat) during steering. Consequently, passenger P2's shoulder blades, which are on the right side of the seat, are pressed further against the seat back 14, and a biasing reaction force is applied to passenger P2 from the right upper cushion 20C toward the upper side of the seat. This causes passenger P2's upper body PU2 to move closer to their lower body PL2, thereby promoting inward (to the left side of the seat) rolling, thereby stabilizing passenger P2's seating posture.

[0066] In addition, in this embodiment, if Figure 2As shown, the cushion pad 20 has a generally S-shaped cross-section when viewed across the seat width. This allows for a simple structure to stabilize the occupant's seating posture. Furthermore, the direction of the applied deflection reaction force can be easily reversed simply by reversing the cushion pad 20 vertically. Furthermore, by using the same cushion pad 20, there's no need to prepare dedicated cushion pads tailored to the direction of the reaction force, thus reducing management complexity.

[0067] In addition, although in this embodiment Figure 4A as well as Figure 4B The direction of the reaction force is set as shown in FIG, but is not limited to this. For example, 7A to 7C The structure of the modified example is shown.

[0068] First modification example

[0069] Figure 7A 1 is a front view schematically showing a vehicle seat 30 according to a first modified example. Figure 7B 2 is a front view schematically showing a vehicle seat 32 according to a second modified example. Figure 7C It is a front view schematically showing a vehicle seat 34 according to a third modified example.

[0070] like Figure 7A As shown, in the vehicle seat 30 according to the first modified example, the upper center cushion pad 20A and the lower center cushion pad 20B are mounted in such a direction that the reaction force acts toward the upper side of the seat.

[0071] Furthermore, the right upper cushion pad 20C and the right lower cushion pad 20D of the vehicle seat 30 are mounted so that the reaction force acts toward the upper side of the seat. Furthermore, the left upper cushion pad 20E and the left lower cushion pad 20F are mounted so that the reaction force acts toward the upper side of the seat. That is, in the vehicle seat 30 according to the first modified example, all cushion pads 20 are mounted so that the reaction force acts toward the upper side of the seat.

[0072] Even when all the cushion pads 20 are mounted in the same direction as in this modified example, a certain posture improvement effect can be obtained by applying a reaction force in the direction in which the spine is extended.

[0073] Second modification example

[0074] like Figure 7B As shown, in the vehicle seat 32 according to the second modified example, the center upper cushion pad 20A and the center lower cushion pad 20B are mounted in such a direction that the reaction force acts toward the upper side of the seat.

[0075] Furthermore, the right upper cushion pad 20C and the right lower cushion pad 20D of the vehicle seat 32 are installed in such a direction that the reaction force acts toward the lower side of the seat and the inner side in the seat width direction (the left side of the seat). Furthermore, the left upper cushion pad 20E and the left lower cushion pad 20F are installed in such a direction that the reaction force acts toward the lower side of the seat and the inner side in the seat width direction (the right side of the seat).

[0076] For example, by inclining the extending direction of the connecting spring portion constituting the cushion pad 20 , the reaction force can be applied downward to the seat and inward in the seat width direction.

[0077] In this modified example, a reaction force acts on the occupant's back inward in the seat width direction from the right upper cushion pad 20C, the right lower cushion pad 20D, the left upper cushion pad 20E, and the left lower cushion pad 20F. This can prevent the occupant's upper body from moving outward when the vehicle turns, etc.

[0078] Third Amendment

[0079] like Figure 7C As shown, in the vehicle seat 34 according to the third modified example, the center upper cushion pad 20A and the center lower cushion pad 20B are mounted in such a direction that the reaction force acts toward the upper side of the seat.

[0080] Furthermore, the right upper cushion pad 20C and the right lower cushion pad 20D of the vehicle seat 34 are installed in such a direction that the reaction force acts toward the lower side of the seat and outward in the seat width direction (to the right side of the seat). Furthermore, the left upper cushion pad 20E and the left lower cushion pad 20F are installed in such a direction that the reaction force acts toward the lower side of the seat and outward in the seat width direction (to the left side of the seat).

[0081] In this modified example, even in a case where a large reaction force does not act from the cushion pad 20 as in the case of a shorter occupant, a force causing the pelvis of the occupant to tilt can be applied.

[0082] Fourth Amendment

[0083] Figure 8A This is an enlarged cross-sectional view of the main parts showing an enlarged cross section of a cushion pad 40 according to a fourth modified example. The cushion pad 40 according to this modified example is constructed to include a first base plate portion 42 and a second base plate portion 44 extending in the seat width direction and the seat vertical direction, and a connecting spring portion 46 connecting the first base plate portion 42 and the second base plate portion 44 in the seat front-rear direction.

[0084] The connecting spring portion 46 has a substantially S-shaped cross section when viewed in the seat width direction. Specifically, the connecting spring portion 46 is formed into a substantially S-shaped shape so that a first bulging portion 46A bulging from the first base plate portion 42 toward the second base plate portion 44 and a second bulging portion 46B bulging from the second base plate portion 44 toward the first base plate portion 42 are connected.

[0085] Here, in the connecting spring portion 46 of this modified example, the connection portion between the first protrusion 46A and the first base plate portion 42 and the connection portion between the second protrusion 46B and the second base plate portion 44 are offset in the seat vertical direction. In other words, an imaginary line extending in the seat front-rear direction from the connection portion between the first protrusion 46A and the first base plate portion 42 and an imaginary line extending in the seat front-rear direction from the connection portion between the second protrusion 46B and the second base plate portion 44 are offset in the seat vertical direction.

[0086] In this modification, the angle of the deflection reaction force can be adjusted by shifting the connection between the first bulge 46A and the first base plate 42 and the connection between the second bulge 46B and the second base plate 44 in the seat vertical direction.

[0087] Fifth Amendment

[0088] Figure 8B This is an enlarged cross-sectional view of the main parts showing an enlarged cross section of a cushion pad 50 according to a fifth modification. The cushion pad 50 of this modification is constructed to include a first base plate portion 52 and a second base plate portion 54 extending in the seat width direction and the seat vertical direction, and a connecting spring portion 56 connecting the first base plate portion 52 and the second base plate portion 54 in the seat front-rear direction.

[0089] The connecting spring portion 56 has a substantially S-shaped cross section when viewed in the seat width direction. Specifically, the connecting spring portion 56 is formed into a substantially S-shaped shape so that a first bulge 56A bulging from the first base plate portion 52 toward the second base plate portion 54 and a second bulge 56B bulging from the second base plate portion 54 toward the first base plate portion 52 are connected.

[0090] In this modification, the connection portion between the first bulged portion 56A and the first base plate portion 52 and the connection portion between the second bulged portion 56B and the second base plate portion 54 are set at substantially the same position in the seat vertical direction.

[0091] According to this modification, the gap between the first bulged portion 56A and the second base plate portion 54 is smaller than that of the connecting spring portion 26 of the embodiment, and the gap between the second bulged portion 56B and the first base plate portion 52 is smaller. As a result, compared to the embodiment, the connecting spring portion 56 is more likely to contact the first base plate portion 52 and the second base plate portion 54 during compression of the cushion pad 50, thereby enabling the reaction force to be applied earlier.

[0092] Sixth Amendment

[0093] Figure 9 It is a cross-sectional view schematically showing a cross section of a vehicle seat 60 according to a sixth modified example when viewed in the seat width direction.

[0094] like Figure 9 As shown, the vehicle seat 60 in this modification is different from the embodiment in that a plurality of cushion pads are arranged in the thickness direction of the seat back main body 18 .

[0095] The upper center cushion 62A and the lower center cushion 62B are mounted so that the reaction force acts upward on the seat. Furthermore, a rear upper center cushion 64A is positioned on the seat rear side relative to the upper center cushion 62A. Furthermore, a rear lower center cushion 64B is positioned on the seat rear side relative to the lower center cushion 62B.

[0096] The rear center upper cushion pad 64A and the rear center lower cushion pad 64B are mounted in such a direction that the reaction force acts toward the upper side of the seat.

[0097] In addition, in this modification, the right upper cushion pad, the right lower cushion pad, the left upper cushion pad and the left lower cushion pad (not shown) can be connected with the Figure 4A The same direction as the embodiment shown can be configured. Figure 4B The embodiments shown are configured in the same orientation.

[0098] A rear right upper cushion pad (not shown) is disposed adjacent to the right of the rear center upper cushion pad 64A, and a rear left upper cushion pad (not shown) is disposed adjacent to the left of the rear center upper cushion pad 64A. Furthermore, a rear right lower cushion pad (not shown) is disposed adjacent to the right of the rear center lower cushion pad 64B, and a rear left lower cushion pad (not shown) is disposed adjacent to the left of the rear center lower cushion pad 64B.

[0099] The orientations of the rear right upper cushion pad, rear right lower cushion pad, rear left upper cushion pad, and rear left lower cushion pad are not particularly limited, and may be the same orientation as or different from the cushion pads adjacent to the seat front side.

[0100] According to this modification, one of the center upper cushion pad 62A and the rear center upper cushion pad 64A is formed to be more easily deformed than the other, thereby changing the direction of the reaction force applied to the occupant according to the occupant's physique.

[0101] Although the vehicle seat structure according to the embodiment and the modified example has been described above, it is obvious that the vehicle seat structure can be implemented in various forms without departing from the scope of the present invention. Figure 1 As shown, six cushion pads 20 are provided on the seat back body 18, but the present invention is not limited thereto and the number of cushion pads may be varied. For example, a structure may be provided with only three cushion pads 20: a center lower cushion pad 20B, a right lower cushion pad 20D, and a left lower cushion pad 20F.

[0102] Furthermore, for example, a structure in which three or more cushion pads are arranged vertically may be employed. Furthermore, the shape of each cushion pad is not particularly limited and may be formed in a shape other than a rectangular parallelepiped.

[0103] Furthermore, although in the above embodiment Figure 2 As shown, eight connecting spring portions 26 are provided, but the present invention is not limited thereto, and the number of connecting spring portions may be increased or decreased. For example, if the connecting spring portions are formed of a resin having lower rigidity than the cushion pad of the embodiment, the rigidity of the cushion pad can be increased by reducing the spacing between the connecting spring portions and increasing the number of connecting spring portions.

[0104] Furthermore, while the above-described embodiment employs a structure that applies a deflection reaction force by using a connecting spring portion that is substantially S-shaped when viewed across the seat width, this is not limiting and other structures may be employed. For example, a structure may be employed in which the reaction force is applied in any direction by forming the cushion body from a soft material such as foamed polyurethane and arranging plates made of a harder material such as plastic at equal intervals within the cushion body. In this structure, the angle of the deflection reaction force can be adjusted by varying the inclination angle of the plates.

[0105] The following supplementary notes are disclosed with respect to the above-mentioned embodiment.

[0106] Note 1

[0107] A vehicle seat structure comprising:

[0108] A seat back body extending in the seat width direction and the seat up-down direction and capable of supporting the back of the occupant;

[0109] The central reaction force applying portion is provided at a portion of the seat back body in the central portion in the seat width direction where the back of the occupant contacts, and is capable of applying a reaction force toward the upper side of the seat to the back of the occupant contacting the seat back.

[0110] Note 2

[0111] The vehicle seat structure as described in Supplementary Note 1, wherein:

[0112] The outer reaction force applying portions are arranged side by side on both sides of the central reaction force applying portion in the seat width direction and are capable of applying a reaction force toward the seat lower side to the back of the occupant that contacts the outer reaction force applying portion.

[0113] Note 3

[0114] The vehicle seat structure as described in Supplementary Note 2, wherein:

[0115] The seat back body includes an upper outer reaction force applying portion on the seat upper side of the outer reaction force applying portion. The upper outer reaction force applying portion can apply a reaction force toward the seat lower side to the back of the occupant that contacts the upper outer reaction force applying portion.

[0116] Note 4

[0117] The vehicle seat structure as described in Supplementary Note 2, wherein:

[0118] The seat back body includes an upper outer reaction force applying portion on the seat upper side of the outer reaction force applying portion. The upper outer reaction force applying portion can apply a reaction force toward the seat upper side to the back of the occupant that contacts the upper portion.

[0119] Note 5

[0120] The vehicle seat structure as described in any one of Supplementary Notes 1 to 4, wherein:

[0121] The central reaction force applying portion is configured to include a cushion pad having an S-shaped cross section when viewed in the seat width direction.

Claims

1. A vehicle seat structure comprising: A seat back body extending in the seat width direction and the seat up-down direction and capable of supporting the back of the occupant; The central reaction force applying portion is provided at a portion of the seat back body in the central portion in the seat width direction where the back of the occupant contacts, and is capable of applying a reaction force toward the upper side of the seat to the back of the occupant contacting the seat back.

2. The vehicle seat structure according to claim 1, wherein: The outer reaction force applying portions are arranged side by side on both sides of the central reaction force applying portion in the seat width direction and are capable of applying a reaction force toward the seat lower side to the back of the occupant that contacts the outer reaction force applying portion.

3. The vehicle seat structure according to claim 2, wherein: The seat back body includes an upper outer reaction force applying portion on the seat upper side of the outer reaction force applying portion. The upper outer reaction force applying portion can apply a reaction force toward the seat lower side to the back of the occupant that contacts the upper outer reaction force applying portion.

4. The vehicle seat structure according to claim 2, wherein: The seat back body includes an upper outer reaction force applying portion on the seat upper side of the outer reaction force applying portion. The upper outer reaction force applying portion can apply a reaction force toward the seat upper side to the back of the occupant that contacts the upper portion.

5. The vehicle seat structure according to any one of claims 1 to 4, wherein: The central reaction force applying portion is configured to include a cushion pad having an S-shaped cross section when viewed in the seat width direction.

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