JP2017144752A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a deformation of a seat shape when a large load is applied, in a more appropriate manner.SOLUTION: A seat 1 comprises: a reclining plate 40 supporting a seat back 2; and a lower arm 31 of a cushion frame 30 aligned with the reclining plate 40 in a substantially perpendicular direction to a seat width direction. The seat includes a displacement restriction structure RS restricting a relative displacement between the reclining plate 40 and the lower arm 31 by a contact when an external load is applied to the seat back 2. The displacement restriction structure RS comprises: a first contact structure for contacting a cylindrical part 35A of a bush 35 extending from the lower arm 31 and a protruding part 43 of the reclining plate 40 both of which relatively approach to each other; and a second contact structure for contacting a flange part 35B of the bush 35 and the protruding part 43 of the reclining plate 40, both of which approach to each other when a relative displacement also occurs in a seat width direction substantially perpendicular to the above-mentioned contact direction.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat having a first frame portion that supports a seat back and a second frame portion that is provided side by side in a specific direction with the first frame portion.

  Conventionally, in a vehicle seat, a displacement regulation structure has been provided that prevents excessive collapse of the seat back and prevents the seat from collapsing and deforming when a large load resulting from a vehicle collision is input to the seat back. One is known (Patent Document 1). Specifically, at the connection point between the reclining plate that supports the seat back and the lower arm that forms the side skeleton of the seat cushion, the reclining plate is pressed against the rear rod that is bridged between the left and right lower arms when a heavy load is applied. It is to restrict deformation.

Japanese Patent Laying-Open No. 2015-3574

  However, in the above-described prior art, even if the reclining plate is pressed against the rear rod, the reclining plate may slide in the axial direction along the rear rod, and displacement of the reclining plate relative to the lower arm cannot be sufficiently controlled. The present invention was devised as a solution to the above-described problem, and the problem to be solved by the present invention is to more appropriately suppress the deformation of the sheet shape when a heavy load is input. is there.

  In order to solve the above problems, the vehicle seat of the present invention takes the following means.

  A first invention is a vehicle seat having a first frame portion that supports a seat back and a second frame portion that is arranged in a specific direction with the first frame portion, and is external to the seat back. It has a displacement regulating structure that regulates relative displacement between the first frame portion and the second frame portion by contact when a load is input. The displacement regulating structure has a first abutting structure that abuts the first approaching portions that are in a relatively close movement relationship between the two frame portions, and a direction that is substantially perpendicular to the abutting direction of the first abutting structure. And a second abutting structure that abuts the second approaching portions that are in a relationship of relatively moving between the two frame portions when relative displacement occurs between the two frame portions. Yes.

  According to the first aspect of the present invention, the relative displacement generated between the two frame portions due to the external load input to the seat back is regulated in two directions that are in a relation of moving toward each other by the displacement regulating structure. Therefore, the relative displacement can be appropriately regulated without causing a slip in the other direction. As a result, the seat back collapse due to the progress of the relative displacement is appropriately suppressed, so that the deformation of the seat shape can be appropriately suppressed.

  The second invention is the following configuration in the first invention described above. The first frame portion may be configured to cause relative displacement in two directions, a seat width direction and a direction substantially perpendicular to the seat width direction, with respect to the second frame portion due to an external load input to the seat back. Yes.

  According to the second aspect of the present invention, when an external load in the front-rear direction is input to the seat back, the first frame portion is appropriately deformed in a sliding direction such as spreading in the seat width direction with respect to the second frame portion. Therefore, the deformation of the sheet shape can be appropriately suppressed.

  The third invention is the following configuration in the second invention described above. The first frame portion and the second frame portion are connected to each other at a plurality of positions in a direction substantially perpendicular to the seat width direction. When an external load is input to the seat back, the first frame portion is The relative displacement is generated in such a manner that the two frame portions rotate in a direction substantially perpendicular to the sheet width direction with any one of a plurality of connection locations as a base point.

  According to the third aspect, it becomes easy to control the deformation mode of the first frame portion with respect to the second frame portion when an external load is input to the seat back. Therefore, the relative displacement that occurs between the two frame portions as a result of this deformation can also be regulated appropriately.

  According to a fourth invention, in any one of the first to third inventions described above, the following configuration is adopted. The first approach part and the second approach part, which are the constituent elements of the second frame part, are formed as an integral structure composed of one part, and the first approach part and the second approach part that are the constituent elements of the first frame part. The parts are also integrated with each other by one component.

  According to the fourth aspect of the invention, the relative displacement in the two directions generated between the two frame portions can be easily and appropriately restricted by the configuration integrally formed in each frame portion.

  According to a fifth invention, in any of the first to fourth inventions described above, the following configuration is adopted. The first approaching parts constituting the first contact structure are arranged apart from each other in the initial state, and the second approaching parts constituting the second contact structure are arranged apart from each other in the initial state. Yes.

  According to the fifth aspect, when the first frame part is assembled to the second frame part, interference between the first approaching parts and interference between the second approaching parts are less likely to occur, so that the assembly workability can be improved. it can.

  A sixth invention is the following configuration in any of the first to fifth inventions described above. The second frame portion includes a main body portion that forms a side skeleton of the seat cushion and is connected to the first frame portion in the seat width direction, and protrudes from the main body portion in the seat width direction between the side skeletons of the seat cushion. And a tubular portion cross-linked. The outer peripheral surface of the tubular portion is a component of the first abutting structure that is disposed to face the first approaching portion of the first frame portion in a direction substantially perpendicular to the seat width direction. In addition, the configuration of the second contact structure in which the diameter-enlarged portion formed on the outer peripheral surface of the tubular portion and expanded toward the radially outer side contacts the second approach portion of the first frame portion in the seat width direction. It is an element.

  According to the sixth aspect of the present invention, the relative displacement in the two directions generated between the two frame portions can be simply and appropriately regulated using the configuration of the tubular portion having the enlarged diameter portion.

  A seventh invention is the following configuration in any of the first to sixth inventions described above. At least any one of the first approaching portions constituting the first contact structure has a shape protruding so as to close a gap with the counterpart side.

  According to the seventh aspect, even when the first approaching parts are assembled in a form separated from each other, the first approaching parts are brought into early contact with each other when an external load is input to the seat back. Relative displacement can be regulated.

  The eighth invention is the following structure in the seventh invention described above. At least any one of the second approaching parts constituting the second contact structure has a shape protruding so as to close the gap with the other side.

  According to the eighth aspect of the invention, even when the second approaching parts are assembled so as to be separated from each other, the second approaching parts are brought into early contact with each other when an external load is input to the seat back. Relative displacement can be regulated.

  A ninth invention is the following structure in the seventh or eighth invention described above. The first approach part of the first frame part is configured as a projecting part partially projecting toward the first approach part of the second frame part, and this projecting part is the first approach part and the second approach part of the second frame part. It is set as the structure contact | abutted to both parts.

  According to the ninth aspect, the configuration of the projecting portion can be simplified, and the projecting portion can be made suitable for both the first approaching portion and the second approaching portion of the second frame portion by the displacement of only the projecting portion. It can be set as the structure which is made to contact | abut easily.

  A tenth aspect of the present invention is the following structure according to any one of the first to ninth aspects of the invention described above. The first frame portion is disposed at a position outside the second frame portion in the seat width direction, and the second approach portion of the second frame portion is located at an outer position in the seat width direction than the second approach portion of the first frame portion. It is arranged.

  According to the tenth aspect of the invention, the movement of the first frame portion sliding toward the outer side in the seat width direction with respect to the second frame portion can be appropriately restricted by the contact between the second approaching portions.

  An eleventh aspect of the present invention is the following structure in the first to tenth aspects of the invention described above. The second frame portion is formed with a weakened portion that causes a local stress concentration due to an external load input to the seat back to easily cause a relative displacement between the two frame portions.

  According to the eleventh aspect, it becomes easy to control the deformation mode of the first frame portion with respect to the second frame portion when an external load is input to the seat back so that the weak portion is a base point. Therefore, it can be appropriately performed at a position aimed at regulating the relative displacement generated between both frame portions.

1 is a perspective view illustrating a schematic configuration of a vehicle seat of Example 1. FIG. FIG. 2 is an exploded perspective view of FIG. 1. It is a right view of FIG. It is the IV section enlarged view of FIG. It is the perspective view which looked at FIG. 4 from the inner side. FIG. 4 is an enlarged view of a VI part in FIG. 3. It is the VII-VII sectional view taken on the line of FIG. FIG. 7 is an enlarged view corresponding to FIG. 6 illustrating a state in which the reclining plate is applied to the bush of the rear pipe due to a large load input to the seat back. It is the IX-IX sectional view taken on the line of FIG. FIG. 10 is a cross-sectional view illustrating a state in which the protruding portion of the reclining plate is applied to the flange portion of the bush from the state of FIG. 9. It is an enlarged view showing schematic structure of the vehicle seat of Example 2 by the side view corresponding to FIG. It is the XII-XII sectional view taken on the line of FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

<Basic structure of sheet 1>
First, the configuration of the seat 1 (vehicle seat) according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the seat 1 of this embodiment is configured as a left seat of an automobile. The seat 1 includes a seat back 2 that serves as a backrest for a seated occupant and a seat cushion 3 that serves as a seating portion. In the following description, the “sheet width direction” refers to the lateral width direction (left-right direction) of the sheet 1. The term “vehicle width direction” refers to the lateral width direction (left and right direction) of the vehicle, and the term “inner side in the vehicle width direction” refers to the right side of the seat 1. In the case of “outside”, it indicates the left side of the sheet 1.

  The seat 1 has a so-called “power seat” configuration in which the backrest angle of the seat back 2 and the seating position of the seat cushion 3 can be adjusted by electric operation by operating the switches, respectively. Has been. Specifically, the seat back 2 has a configuration in which lower end portions on both left and right sides thereof are connected to rear end portions on both left and right sides of the seat cushion 3 via electric recliners 4, respectively. . As a result, the seat back 2 is normally held in a state in which the backrest angle is fixed by each of the recliners 4 described above, and the backrest angle is adjusted by electrically operating each recliner 4 by operating a switch (not shown). It is set as the structure adjusted in the form inclined in the front-back direction.

  The seat cushion 3 is connected to a vehicle floor F (corresponding to a “vehicle main body” of the present invention) via a pair of left and right electric slide rails 5. As a result, the seat cushion 3 is normally held in a state in which the seating position is fixed by the slide rails 5 described above, and the seating position is adjusted by electrically operating the slide rails 5 by operating a switch (not shown). It is set as the structure adjusted to the front-back direction.

  The seat cushion 3 is configured such that an electric seat lifter 6 is interposed between the pair of left and right slide rails 5 described above. As a result, the seat cushion 3 is normally held in a state in which its seating height is fixed by the seat lifter 6 described above, and the seating height is adjusted by electrically operating the seat lifter 6 by operating a switch (not shown). It is set as the structure.

  By the way, the seat back 2 mentioned above is assembled | attached to the rear-end part of the seat cushion 3 as follows, as shown in FIGS. First, as shown in FIG. 2, the above-described seat back 2 includes a back frame 20 that constitutes a skeleton of the pair of left and right side frames 21 and an upper frame 22 that connects between the upper ends of the side frames 21. It is set as the structure assembled | assembled in the shape of a reverse U shape of front view.

  Each of the pair of left and right side frames 21 is formed of a vertically long steel plate having a surface facing in the seat width direction. Further, the upper frame 22 is formed of a steel plate material bent into a reverse U-shape when viewed from the side. The upper frame 22 is bridged so as to straddle between the upper ends of the side frames 21 described above, and is integrally coupled by welding. A thick plate-shaped reclining plate 40 is connected to the outer side surface portion on the lower end side of each side frame 21 via each recliner 4 described above. These reclining plates 40 are made of a steel plate material that is thicker than the side frames 21 described above, and have a higher structural strength than the side frames 21.

  On the other hand, the cushion frame 30 constituting the skeleton of the seat cushion 3 is assembled in a substantially U shape in plan view by a pair of left and right lower arms 31 and a front panel 32 connecting the front end portions of the lower arms 31. It has been configured. Each of the pair of left and right lower arms 31 is formed of a steel plate material that is long in the front-rear direction and faces in the sheet width direction. The front panel 32 is formed of a steel plate material that is long in the sheet width direction with the surface facing in the height direction. The front panel 32 is bridged so as to straddle between the upper portions on the front end side of the lower arms 31 described above.

  The seat back 2 described above is in a state in which the reclining plate 40 is assembled in advance to the lower ends of the left and right sides of the back frame 20 via the recliners 4 as described above (sub-assembled state). The seat arms 3 are integrally assembled to the rear end portions of the lower arms 31 by being fastened to the rear end portions of the lower arms 31 on the left and right sides of the seat cushion 3 by two bolts B1 and B2, respectively. Specifically, the seat back 2 is set in such a manner that each of the reclining plates 40 is partially overlapped with the rear end portion of each lower arm 31 of the seat cushion 3 on the outside in the seat width direction. The bolts B1 and B2 are inserted from the outside in the seat width direction and fastened at two overlapping positions in the front and rear, thereby being integrally assembled to the rear end portion of each lower arm 31.

  As a result of the above assembly, the seat back 2 is assembled in such a state that the lower end portions on both the left and right sides thereof are strongly supported by the rear end portions on both the left and right sides of the seat cushion 3 via the thick reclining plates 40 having high structural strength. Yes. Each reclining plate 40 described above is configured to be thicker and higher in structural strength than each of the lower arms 31 described above. The seat back 2 having the above-described structure strongly receives the backrest load received when the seated occupant leans from the front side by the support by the lower arms 31 of the seat cushion 3 connected via the reclining plates 40. Be able to.

  However, as shown in FIG. 8, the seat back 2 is configured so that the backrest load received from the back of the seated occupant is connected via the reclining plate 40 when a rear collision of the vehicle occurs. If the lower arm 31 is too large to cause plastic deformation, the load may not be received at a fixed position. That is, as the plastic deformation of each lower arm 31 progresses, the seat back 2 falls to the rear side. And if the amount of the seat back 2 to fall down becomes excessive, the support shape (seat shape) of the seat 1 that supports the body of the seated occupant will collapse, which is a problem.

  However, on the other hand, in order to prevent the seat back 2 from falling down due to the deformation, for example, if the structure strength is increased by increasing the thickness of each lower arm 31, the weight of each lower arm 31 is increased. In addition, plastic deformation may occur or breakage may occur in other places, and as a result, the fall of the seat back 2 may be promoted. Therefore, the seat 1 is brought into contact with the lower arm 31 after the plastic deformation of the lower arms 31 is performed within an appropriate range so that the amount of the seatback 2 that falls when the heavy load is input is not excessive. Displacement regulating structure RS is provided so that it can be regulated by the above.

  Specifically, when the above-described large load is input, the displacement regulating structure RS causes each reclining plate 40 connected to the rear end portion of each lower arm 31 to be plastically deformed with each lower arm 31. Excessive deformation is restricted by contacting the outer peripheral surfaces of the bushes 6B1 on both ends of the rear pipe 34 bridged between the lower arms 31. As shown in FIG. 9, among the bushes 6B1 constituting the displacement regulating structure RS, the right bush 35 (6B1) disposed on the inner side in the vehicle width direction is the corresponding reclining plate 40 as described above. In contact with the outer peripheral surface of the cylindrical portion 35A (actually the outer peripheral surface of a spacer 36 described later), and further, as shown in FIG. The reclining plate 40 (projection 43 thereof) is also brought into contact with the flange 35B protruding in a ring shape from the inner side in the seat width direction.

  Due to the displacement regulating structure RS described above, in the inner structure in the vehicle width direction of the seat 1, the reclining plate 40 is moved in addition to the forward and downward movement in which the reclining plate 40 is applied to the outer peripheral surface of the cylindrical portion 35 </ b> A of the bush 35. When there is a slip along the outer peripheral surface of the cylindrical portion 35 </ b> A of the bush 35 in the vehicle width direction, the movement in that direction is also restricted. By the movement restriction in the two directions, the relative displacement of the reclining plate 40 disposed on the inner side in the vehicle width direction with respect to the lower arm 31 is appropriately restricted.

  Here, the lower arm 31 on the inner side in the vehicle width direction of the cushion frame 30 described above corresponds to the “second frame portion” of the present invention. The reclining plate 40 on the same side corresponds to the “first frame portion” of the present invention. The bush 35 on the same side corresponds to the “rod” of the present invention. The cylindrical portion 35A of the bush 35 corresponds to the “first approach portion” of the present invention. Further, the flange portion 35B of the bush 35 corresponds to the “expanded portion” and the “second approach portion” of the present invention.

<Specific Configuration of Cushion Frame 30>
Hereinafter, a more specific configuration of the above-described displacement regulating structure RS will be described in detail together with its peripheral structure. First, a specific configuration of the cushion frame 30 described above will be described with reference to FIGS. That is, in the cushion frame 30 described above, in addition to the configurations of the lower arms 31 and the front panel 32 described above, a pair of left and right front links 6A and rear links 6B that constitute the seat lifter 6 described above are provided on the lower arms 31 on each side. Bushings 6A1 and 6B1 serving as connecting members for coupling, and a front pipe 33 and a rear pipe 34 for integrally connecting the bushes 6A1 and the bushes 6B1 on the left and right are assembled.

  The pair of left and right bushes 6A1 and 6B1 described above are fitted into the corresponding lower arms 31 to be assembled in such a manner as to penetrate in the axial direction in the seat width direction and are rotatably supported. It is assembled as a state. The upper end portions of the corresponding front links 6A and the upper end portions of the rear links 6B are respectively passed through the bushes 6A1 and 6B1 in the axial direction and integrally assembled by welding. Further, the front pipe 33 is bridged between the two front bushes 6A1 described above and assembled integrally by welding, and the rear pipe 34 is also bridged between the two rear bushes 6B1 and integrally assembled by welding. Yes.

  Note that the lower end portion of each front link 6A and the lower end portion of the rear link 6B described above are connecting shafts 6A2 that are directed axially in the seat width direction with respect to the upper portions of the corresponding slide rails 5 on the left and right sides, respectively. , 6B2 so as to be rotatably supported. As a result of the assembly, the pair of left and right front links 6A and rear links 6B are rotated upside down by a one-degree-of-freedom link motion between the lower arm 31 and the slide rail 5 on the left and right sides of the cushion frame 30 described above. The knot link mechanism is assembled. The up-and-down rotation of the pair of left and right front links 6A and rear links 6B is performed by the driving force exerted by the driving unit 6C connected to the bush 6B1 of the left rear link 6B on the outer side in the vehicle width direction. It has become.

  The drive unit 6C described above is coupled to the above-described bush 6B1 in a state where power can be transmitted via a gear meshing structure (not shown). In the initial state, the drive unit 6C holds the bush 6B1 in a state where the rotation of the bushing 6B1 is stopped by the braking force of the motor provided therein, and keeps the rotation of the front link 6A and the rear link 6B. It is supposed to be. The drive unit 6C drives the bush 6B1 in the corresponding rotational direction by driving the motor in the forward and reverse directions by operating a switch (not shown) provided at a predetermined position of the seat 1. The front link 6A and the rear link 6B are rotated up and down simultaneously to adjust the seating height of the seat cushion 3.

  Among the bushes 6B1 described above, the bush 35 connected to the upper end portion of the right rear link 6B which is the inner side in the vehicle width direction is a cylinder whose axial direction is directed in the seat width direction, as shown in FIGS. 35A and a ring-shaped flange portion 35B (see FIG. 7) projecting outward in the radial direction formed at the right end which is the inner side in the vehicle width direction of the cylindrical portion 35A. Yes. The flange portion 35B described above is formed in a shape projecting in an arc shape that forms an outer peripheral shape concentrically curved with the cylindrical portion 35A described above. The bush 35 described above is inserted into the lower arm 31 on the corresponding side to be assembled from the right side (outside in the seat width direction) on the inner side in the vehicle width direction, and the end portion on the side without the flange portion 35B of the cylindrical portion 35A. Thus, the end portion is mounted and welded so as to fit into the outer peripheral portion of the reduced diameter portion 34 </ b> A narrowed in a step shape formed at the corresponding right end portion of the rear pipe 34.

  And in the area | region where the said bush 35 was inserted in the said corresponding lower arm 31, the upper end part of the corresponding rear link 6B is penetrated to the axial direction, and is integrally assembled | attached by welding. The above-described bush 35 is assembled in such a manner that the flange portion 35B is positioned at the protruding position, with the cylindrical portion 35A protruding from the right side which is the inner side in the vehicle width direction of the lower arm 31 by the above-described assembly. It is in a state.

  Specifically, as shown in FIG. 7, the bush 35 has an outer peripheral portion of a cylindrical portion 35A interposed between the flange portion 35B and the lower arm 31, and a cylinder interposed between the lower arm 31 and the rear link 6B. Cylindrical spacers 36 are fitted into the outer peripheral portion of the portion 35 </ b> A so as to be sandwiched therebetween in the sheet width direction. By assembling via the spacers 36, the bushes 35 are assembled in a form that does not shift in the sheet width direction with respect to the corresponding lower arm 31. Specifically, the cylindrical portion 35A of the bush 35 described above is on the right side (the seat width direction) that is on the inner side in the vehicle width direction than the facing portion (projection portion 43 described later) of the reclining plate 40 that faces the outer peripheral surface of the cylindrical portion 35A. And the flange portion 35B is located at the protruding position. Note that the inner corner portion on the base side of the rise of the flange portion 35B of the bush 35 has a shape in which the bulge of R formed when the inner corner portion is formed is cut off. Thus, the spacer 36 fitted into the outer peripheral portion of the cylindrical portion 35A is brought into contact with the inner surface of the flange portion 35B in a form that does not lift up from the cylindrical portion 35A without climbing on the bulge of R. Yes.

  By the way, as shown in FIG.2 and FIGS.4-5, each lower arm 31 mentioned above is formed with the steel plate material long in the front-back direction which orient | assigns a surface to a sheet | seat width direction. Each of the lower arms 31 is connected to each of the reclining plates 40 described above in connection with each connection region 31B formed in a shape partitioned along the edge on the rear end side thereof. Specifically, the connection region 31B is configured such that a step-shaped step portion 31C bent in a crank shape is formed on the outer side in the seat width direction between the connection region 31B and the front body region 31A. . With the step portions 31C, the connection region 31B of each lower arm 31 is formed at a position offset to the outside in the sheet width direction with respect to the main body region 31A on the front side. In addition, the upper edge and the lower edge that leave the rear edge of each connection region 31B of each lower arm 31 described above are arranged on the outer side in the sheet width direction along each edge. A bent upper flange portion 31D and a lower flange portion 31E are formed. Each of the upper flange portion 31D and the lower flange portion 31E is formed so as to continuously extend in a flush manner in the front-rear direction so as to straddle the formation position of the stepped portion 31C in the front-rear direction.

  More specifically, each of the step portions 31C described above extends obliquely backward and downward over substantially the entire area in the height direction where the upper flange portion 31D and the lower flange portion 31E of each lower arm 31 are left. Is formed. Then, the respective reclining plates 40 corresponding to the connecting regions 31B partitioned from the main body regions 31A of the respective lower arms 31 through the respective step portions 31C are partially overlapped on the outside in the sheet width direction. The bolts B1 and B2 are respectively inserted and fastened from the outside in the seat width direction to the overlapping two portions of the front upper side and the rear lower side, and the respective reclining plates 40 are integrally assembled. Yes.

  Specifically, the connection region 31B of each lower arm 31 is arranged at the same position in the seat width direction as each disk-shaped recliner 4 coupled to the inner side surface of each reclining plate 40 assembled to the outer side surface portion. Has been. Therefore, the connection region 31B of each lower arm 31 has a rear edge portion of each recliner 4 so that each recliner 4 can be disposed at a relatively close position while avoiding interference with each recliner 4 described above. It is a shape that has been cut into a concave shape that is obliquely curved backward and downward along the outer peripheral shape.

  Then, the front upper end portion and the rear lower end portion of the connection region 31B of each lower arm 31 formed in a shape that extends obliquely to the rear are respectively bolts B1, B1 from the outside in the seat width direction. A round hole-shaped fastening hole 31Ba is formed so that B2 can be inserted. Further, a weld nut 31Bb capable of screwing and fastening bolts B1 and B2 inserted into each fastening hole 31Ba is welded to the inner side surface of the formation region of each fastening hole 31Ba in each connection region 31B. .

  On the other hand, each reclining plate 40 is formed in a substantially triangular flat plate shape that is assembled in a state in which the base regions thereof are overlapped in an obliquely upward angle posture with respect to each connection region 31B described above. In the upper and lower corners of the base region superimposed on each connection region 31B of each reclining plate 40, a round hole-shaped fastening is provided at a position corresponding to each fastening hole 31Ba formed in each connection region 31B described above. A hole 42 is formed. Each reclining plate 40 is set in a state in which the fastening holes 42 are aligned with the corresponding fastening holes 31Ba formed in the connection regions 31B of the lower arms 31 described above. The bolts B1 and B2 are respectively inserted into the fastening holes 42 and 31Ba from the outside in the seat width direction and screwed and fastened to the respective weld nuts 31Bb to be integrally assembled to the connection region 31B of each lower arm 31.

  Each reclining plate 40 described above is connected to the inner side surface thereof by welding the corresponding outer side surface of each recliner 4 integrally. Specifically, each of the reclining plates 40 described above includes three arcuate dowels 4A arranged in the circumferential direction so as to protrude from the outer surface portions of the corresponding recliners 4 connected thereto. Corresponding three arcuate dowel holes 41 that can be fitted from the inside are formed therethrough. The respective recliners 4 described above are firmly and integrally coupled to the respective reclining plates 40 by fitting the respective dowels 4A formed on the outer surface portions thereof into the respective dowel holes 41 and welding them. It is supposed to be in a state.

  For each lower arm 31 connected to each reclining plate 40 as described above, each bush 6B1 for connecting both end portions of the rear pipe 34 to each lower arm 31 is provided through the following positions. It has been. That is, as shown in FIGS. 6 to 7, each bush 6 </ b> B <b> 1 is a rear end portion of the main body region 31 </ b> A that is a region immediately below the connection region 31 </ b> B formed to extend obliquely behind the lower arm 31 described above. Are passed through in the sheet width direction. Since each bush 6B1 is passed through such a position, each bush 6B1 is relatively close to the bottom portion provided at an obliquely upward angle of each reclining plate 40 connected to each connection region 31B. It is set as the state provided in the position which comprises.

  As shown in FIG. 8, the seat 1 configured as described above has a seat back when the backrest load applied to the seat back 2 from the back of the seated occupant exceeds a certain value, such as when a rear collision of the vehicle occurs. A load of a strong bending moment that tends to be twisted rearward is applied to each reclining plate 40 that supports 2 on the lower end side. Due to the load of this strong bending moment, each lower arm 31 connected to each reclining plate 40 is subjected to an eccentric bending action due to its offset shape at the stepped portion 31C that is structurally weak, and is locally The stress is concentrated, and the buckling deformation is preferentially performed so that the rise of the step is tilted forward. Here, the step portion 31C corresponds to the “fragile portion” of the present invention.

  Then, with the buckling deformation of each stepped portion 31C, the connection region 31B located on the rear side of each stepped portion 31C is integrated with each reclining plate 40, and the body located on the front side of each stepped portion 31C. It is displaced forward and downward with respect to the region 31A. Specifically, when a backward load applied to the seat back 2 is input to each of the reclining plates 40 described above, as shown by the black arrows in FIG. The force pulled backward acts on the upper part of the connection region 31B of each lower arm 31, and the force pushed forward acts on the lower part of the connection region 31B of each lower arm 31. These forces are transmitted mainly at the fastening points of the bolts B1 and B2 that directly connect the reclining plates 40 and the lower arms 31.

  Then, due to the transmission of the respective forces, a force directed obliquely upward to the rear is applied to the fastening portion of the upper bolt B1 that becomes the connection portion of the upper portion, and the upper side of the connection region 31B of each lower arm 31 is applied. The portion receives a force so as to be pulled rearward and obliquely upward with respect to the main body region 31A. On the other hand, a force directed downward in the forward direction is applied to the fastening portion of the lower bolt B2 which is a connection portion of the lower portion, and the lower portion of the connection region 31B of each lower arm 31 is the main body. A force is applied to the region 31A so as to be pushed downward and obliquely downward.

  As a result, the upper portion of the connection region 31B of each lower arm 31 receives a load of a tensile force that is pulled in the in-plane direction with respect to the main body region 31A, but the main body region 31A is surfaced by the upper flange portion 31D. Since it is connected in a single shape, it exhibits a behavior that is relatively difficult to deform. On the other hand, the lower part of the connection region 31B of each lower arm 31 is subjected to a compressive force that is compressed in the in-plane direction with respect to the main body region 31A, and thus exhibits a behavior that is relatively easily deformed. As a result, each lower arm 31 has the above-described connecting regions 31B, together with the reclining plates 40, in the clockwise direction (front and lower) while buckling and deforming the stepped portion 31C around the fastening point of the upper bolt B1. The main body region 31A is displaced in a manner that rotates in the direction).

  As the plastic deformation of each lower arm 31 proceeds, the bottom portion of each reclining plate 40 that is in a positional relationship facing the outer peripheral surface of each bush 6B1 moves closer to the outer peripheral surface of each bush 6B1. Final contact. Due to this contact, the reclining plate 40 is restricted from moving further in the approaching direction. The reason is that each bush 6B1 with which each reclining plate 40 abuts is connected to the main body region 31A, not to the connection region 31B in each lower arm 31, and the force received from each reclining plate 40 after abutment. This is because it is possible to take this strongly. Therefore, since the above-mentioned contact prevents the seat back 2 connected to each reclining plate 40 from being tilted to the rear side, the support shape (seat shape) of the seat 1 that supports the body of the seated occupant is destroyed. Can be suppressed appropriately.

  In addition to the above-described configuration, as shown in FIGS. 6 to 7, the right reclining plate 40 which is the inner side in the vehicle width direction faces the outer peripheral surface of the cylindrical portion 35 </ b> A of the bush 35 on the bottom portion thereof. Thus, a protrusion 43 protruding in a trapezoidal shape is formed. As shown in FIG. 8 to FIG. 9, the protruding portion 43 is connected to the reclining plate 40 together with the connection region 31 </ b> B of each lower arm 31 and the fastening region of the upper bolt B <b> 1 with respect to the main body region 31 </ b> A. Is formed at a position on the movement locus that contacts the outer peripheral surface of the cylindrical portion 35 </ b> A of the bush 35.

  By forming such a protrusion 43, as shown in FIG. 7, the right reclining plate 40, which is the inner side in the vehicle width direction, is mounted on the cylindrical portion 35A of the bush 35 in its initial state. The gap TL in the radial direction formed between the spacers 36 is filled. Therefore, when the large load is input, each reclining plate 40 can be brought into contact with the outer peripheral surface of the cylindrical portion 35A of the bush 35 at an early stage of deformation to prevent the progress of deformation at an early stage.

  Further, the right reclining plate 40, which is the inner side in the vehicle width direction, is such that the protruding portion 43 is in contact with the outer peripheral surface of the cylindrical portion 35A of the bush 35, and the protruding portion 43 is the outer periphery of the cylindrical portion 35A of the bush 35. A flange in which the protrusion 43 protrudes at the outer end of the bush 35 described above even when a movement that slides inward in the vehicle width direction (outside in the seat width direction) along the surface may occur. The movement is restricted by being applied to the portion 35B from the inside. Accordingly, the protrusion 43 of the reclining plate 40 is brought into contact with the outer peripheral surface of the cylindrical portion 35A of the bush 35 and the inner side surface of the flange portion 35B, so that the movement is restricted in two directions. The relative displacement is appropriately regulated. Here, the protrusion 43 corresponds to the “projection part”, “first approach part”, and “second approach part” of the present invention.

  In addition, the above-mentioned protrusion structure is not provided in the reclining plate 40 of the other side arrange | positioned on the outer side of a vehicle width direction. The reason is that the bush 6B1 on the same side does not have a ring-like flange portion projecting radially outward, and the corresponding reclining plate 40 is brought close to the outer peripheral surface of the bush 6B1 in advance. It is because it is assembled. That is, since the bush 6B1 does not have a flange portion, the reclining plate 40 hardly causes interference with the shape of the bush 6B1 when the reclining plate 40 on the same side is assembled, and the reclining plate 40 is brought closer to the outer peripheral surface of the bush 6B1. This is because the assembling property does not deteriorate even if the shape is adopted. For this reason, the reclining plate 40 arranged on the outer side in the vehicle width direction is assembled in a state of being close to the outer peripheral surface of the bush 6B1 in the same manner as the reclining plate 40 on the other side, although there is no protrusion structure. It is set as the structure which has a magnitude | size.

  The reclining plate 40 disposed on the outer side in the vehicle width direction is applied to the outer peripheral surface of the corresponding bush 6B1 by the input of the large load described above, and then the outer side in the vehicle width direction (seat width direction) along the outer peripheral surface. Even if there is a movement that slides toward the outside), the movement in the same direction is restricted by being applied to the inner surface of the rear link 6B welded to the outer end portion of the bush 6B1. It has come to be.

  On the other hand, the reclining plate 40 disposed on the inner side in the vehicle width direction is formed with a flange portion 35 </ b> B protruding from the end portion of the corresponding bush 35. Therefore, when the reclining plate 40 has a shape that is not much packed with the outer peripheral surface of the cylindrical portion 35 </ b> A of the bush 35 described above, the reclining plate 40 is attached to the flange portion of the bush 35 when the reclining plate 40 is assembled. 35B and shape interference are likely to occur. Therefore, the basic shape of the reclining plate 40 described above is a shape in which the outer peripheral surface of the cylindrical portion 35A of the bush 35 described above is separated.

  However, the reclining plate 40 is formed with a protrusion 43 that partially protrudes toward the outer peripheral surface of the cylindrical portion 35A of the bush 35 in a part of the bottom portion facing the outer peripheral surface of the cylindrical portion 35A of the bush 35. ing. Since the protrusion 43 is partially protruding in this way, the reclining plate 40 can be connected to the spacer 36 attached to the cylindrical portion 35A of the bush 35 without deteriorating the assembly property described above. The gap TL can be provided in a closed state. Specifically, as shown in FIG. 7, the protruding portion 43 has an extent in which the protruding tip surface and the protruding tip surface of the flange portion 35 </ b> B of the bush 35 are substantially horizontally aligned in the sheet width direction in the initial state. More specifically, the flange portion 35B is formed in a shape protruding so as not to overlap the radial arrangement. Due to such a shape, the protruding portion 43 is configured to hardly cause interference with the flange portion 35B of the bush 35 when the reclining plate 40 is assembled.

  The protrusion 43 of the reclining plate 40 described above is in contact with the outer peripheral surface of the cylindrical portion 35A of the bush 35 when the large load is input, and then slides in the axial direction along the outer peripheral surface. It does not have to be displaced so as to come into contact with 35B. In other words, the protrusion 43 of the reclining plate 40 described above is inclined relative to the flange 35B of the bush 35 by the relative displacement with respect to the lower arm 31 including the component toward the outside in the seat width direction. It may be contacted at the same time or before the cylindrical portion 35A.

<Summary>
In summary, the sheet 1 of the present embodiment has the following configuration. That is, the first frame portion (reclining plate 40) that supports the seat back (seat back 2), and the second frame portion provided side by side with the first frame portion in a specific direction (a direction substantially perpendicular to the seat width direction). (A lower arm 31 of the cushion frame 30), and a vehicle seat (seat 1) having a relative relationship between the first frame portion and the second frame portion when an external load is input to the seat back. A displacement restricting structure (displacement restricting structure RS) that restricts displacement by contact is provided. The displacement restricting structure includes a first approaching portion (a cylindrical portion 35A of the bush 35 provided on the cushion frame 30 and a reclining) in which both frame portions (between the lower arm 31 and the reclining plate 40) move relatively close to each other. The first abutting structure that abuts the projections 43) of the plate 40 and the two frame portions when relative displacement occurs between the two frame portions in a direction substantially perpendicular to the abutting direction of the first abutting structure. A second abutting structure that abuts the second approaching portions (the flange portion 35B of the bush 35 provided on the cushion frame 30 and the projection 43 of the reclining plate 40) that are in a relatively close relationship with each other. , And so on.

  With such a configuration, the relative displacement generated between the two frame portions (between the lower arm 31 and the reclining plate 40) due to an external load input to the seat back (seat back 2) is The displacement is regulated in two directions (front downward direction and sheet width direction) that are close to each other by the (displacement regulating structure RS). Therefore, the relative displacement can be appropriately regulated without causing a slip in the other direction. As a result, the seat back collapse due to the progress of the relative displacement is appropriately suppressed, so that the deformation of the seat shape can be appropriately suppressed.

  Further, the first frame portion (reclining plate 40) is substantially in the seat width direction and the seat width direction with respect to the second frame portion (lower arm 31 of the cushion frame 30) due to an external load input to the seat back (seat back 2). It is configured to cause relative displacement in two directions, ie, a vertical direction. With such a configuration, when an external load in the front-rear direction is input to the seat back, the first frame portion is deformed in a sliding direction such as spreading in the seat width direction with respect to the second frame portion. Can be appropriately controlled, and the deformation of the sheet shape can be appropriately suppressed.

  Further, the first frame portion (reclining plate 40) and the second frame portion (lower arm 31 of the cushion frame 30) are connected at a plurality of locations (fastening locations of the bolts B1 and B2) in a direction substantially perpendicular to the seat width direction. When an external load is input to the seat back (seat back 2), the first frame portion is connected to the second frame portion at any one of a plurality of connection locations (the upper bolt B1). It is configured such that relative displacement is generated in such a manner as to rotate in a direction substantially perpendicular to the sheet width direction with a fastening point as a base point. With such a configuration, it becomes easy to control the deformation mode of the first frame portion with respect to the second frame portion when an external load is input to the seat back. Therefore, the relative displacement that occurs between the two frame portions (the lower arm 31 and the reclining plate 40) along with this deformation can also be appropriately regulated.

  In addition, the first approach portion (cylindrical portion 35A of the bush 35 provided on the cushion frame 30) and the second approach portion (flange portion 35B of the bush 35), which are constituent elements of the second frame portion, are each one component ( It is an integral structure composed of one part bush 35). Moreover, the 1st approach part and the 2nd approach part which are the components of the 1st flame | frame part (reclining plate 40) are also made into the integral structure mutually comprised by one component (projection part 43). With such a configuration, the relative displacement in two directions generated between the two frame portions (between the lower arm 31 and the reclining plate 40) can be easily and easily achieved by the configuration integrally formed in each frame portion. It can be regulated appropriately.

  In addition, the first approaching portions (the cylindrical portion 35A of the bush 35 provided on the cushion frame 30 and the protruding portion 43 of the reclining plate 40) constituting the first contact structure are arranged apart from each other in the initial state. The second approaching portions (the flange portion 35B of the bush 35 provided on the cushion frame 30 and the protruding portion 43 of the reclining plate 40) constituting the second contact structure are also arranged to be separated from each other in the initial state. With such a configuration, when the first frame part (reclining plate 40) is assembled to the second frame part (lower arm 31 of the cushion frame 30), interference between the first approaching parts and between the second approaching parts Since interference is less likely to occur, assembly workability can be improved.

  The second frame portion (cushion frame 30) includes a main body portion (lower arm 31) connected to the first frame portion (reclining plate 40), and a rod (bush that protrudes from the main body portion in the seat width direction). 35). The first abutting that the outer peripheral surface of the rod (the outer peripheral surface of the spacer 36 attached to the cylindrical portion 35A of the bush 35) abuts the first approaching portion (projecting portion 43) of the first frame portion from the outside in the radial direction. It is a structural component. A diameter-enlarged portion serving as a component of the second abutting structure that abuts the second approaching portion (projecting portion 43) of the first frame portion in the seat width direction in a partial region in the axial direction that is the seat width direction of the rod. (Flange part 35B) is formed in a shape projecting outward in the radial direction. By adopting such a configuration, it is possible to simply and appropriately regulate the relative displacement in two directions generated between both frame portions by using the configuration of a rod having an enlarged diameter portion.

  Further, at least one of the first approaching parts (the reclining plate 40) constituting the first contact structure is a gap (gap TL) with the other side (the spacer 36 attached to the cylindrical portion 35A of the bush 35). ) (A shape in which the reclining plate 40 has a protruding portion 43 protruding toward the cylindrical portion 35 </ b> A of the bush 35). By adopting such a configuration, the first approaching portions (the cylindrical portion 35A of the bush 35 provided on the cushion frame 30 and the protrusion 43 of the reclining plate 40) are assembled so as to be separated from each other. However, when an external load is input to the seat back (seat back 2), the first approaching portions can be brought into contact with each other at an early stage to restrict relative displacement.

  Further, the first approach portion of the first frame portion (projection portion 43 of the reclining plate 40) is configured as a projecting portion that partially protrudes toward the first approach portion of the second frame portion (cylindrical portion 35A of the bush 35). The projecting portion is configured to contact both the first approach portion (the cylindrical portion 35A of the bush 35) and the second approach portion (the flange portion 35B of the bush 35) of the second frame portion. By adopting such a configuration, the configuration of the projecting portion (projecting portion 43) can be simplified, and the projecting portion is displaced from the first approaching portion of the second frame portion and the second by only displacement of the projecting portion. It can be set as the structure which is easy to contact | abut appropriately with both approach parts.

  Further, the first frame part (reclining plate 40) is arranged at a position outside the second frame part (lower arm 31 of the cushion frame 30) in the seat width direction, and the second approach part of the second frame part (on the cushion frame 30). The provided flange portion 35B of the bush 35 is disposed at an outer position in the seat width direction than the second approach portion (projection portion 43) of the first frame portion. With such a configuration, the movement of the first frame portion sliding to the outside in the seat width direction with respect to the second frame portion can be appropriately restricted by contact between the second approaching portions.

  Further, a local stress concentration is generated in the second frame portion (lower arm 31 of the cushion frame 30) by an external load input to the seat back (seat back 2), so that both frame portions (the lower arm 31 and the reclining plate 40). A weak portion (stepped portion 31 </ b> C) that makes it easy to cause relative displacement is formed. By adopting such a configuration, the deformation mode of the first frame part (reclining plate 40) with respect to the second frame part when an external load is input to the seat back is controlled so as to be based on the weak part. It becomes easy. Therefore, it can be appropriately performed at a position aimed at regulating the relative displacement generated between both frame portions.

  Then, the structure of the sheet | seat 1 (vehicle seat) of Example 2 is demonstrated using FIGS. 11-12. In the present embodiment, the protrusion 43 (protruding part) formed on the reclining plate 40 arranged on the right side which is the inner side in the vehicle width direction is the cylindrical part 35A (first approaching part) of the bush 35 (6B1). It is made into the shape which has further the bending part 43A extended in the shape which bent toward the outer side of the sheet | seat width direction in which the flange part 35B (2nd approaching part) of the bush 35 is located in the front site | part which protruded toward it. Yes. By the bent portion 43A, the gap TW in the sheet width direction between the reclining plate 40 and the flange portion 35B of the bush 35 in the initial state is also filled. Therefore, when the large load is input, each reclining plate 40 is brought into contact with the outer peripheral surface of the cylindrical portion 35A of the bush 35 and the inner peripheral surface of the flange portion 35B at an early stage of deformation, so that the progress of the deformation is accelerated. I can stop. In addition, since it is the same as the structure shown in Example 1 about the structure except the above, suppose that the same code | symbol is attached | subjected and description is abbreviate | omitted.

<Other embodiments>
As mentioned above, although embodiment of this invention was described using two Examples, this invention can be implemented with various forms other than the said Example. For example, the configuration of the vehicle seat according to the present invention includes a seat that is applied to a vehicle other than a vehicle such as a railway, a seat other than a left seat of an automobile, and a seat that is used for various vehicles such as an aircraft and a ship. It can also be widely applied to.

  Moreover, the 2nd frame part fixed to a vehicle main body is not restricted to what comprises the frame | skeleton element of a seat cushion. That is, the second frame portion may be configured as a base member such as a bracket for connecting the seat back directly to a vehicle body such as a floor panel without going through the configuration of the seat cushion. In addition, the portion where the first frame portion abuts when the external load of the second frame portion is input is not limited to the outer peripheral surface of the cylindrical member such as the bush shown in the above embodiment, but is a square tube-shaped member. It may be an outer peripheral surface or a component surface of a member having another shape. Further, the first frame portion that is provided in an integrated relationship with the second frame portion and supports the seat back includes a reclining plate, a seat frame such as a bracket connected to the side frame of the seat back or the side frame. Various members that support the back can be applied.

  In addition, the second frame portion and the first frame portion are not limited to being configured separately from each other, and as in the relationship between the main body region and the connection region of the lower arm described in each of the above-described embodiments, It may be configured as a separate area in which relative displacement is caused by the input of an external load. The first frame portion is not limited to being connected to the second frame portion at a plurality of intermittent locations by fastening with a plurality of bolts, but is connected in a continuous form by welding. There may be. The second frame portion and the first frame portion are in a state where the first approaching portions are in contact with each other in the initial state before the external load is input, or the second approaching portions are in contact with each other. It may be provided as a contacted state.

  In addition, the displacement regulating structure that regulates the relative displacement by contact when an external load that causes a relative displacement between the two frame portions described above is input to the seat back is a seat width direction generated between the two frame portions. The relative displacement in any two directions that are substantially perpendicular to each other in the seat height direction and the seat front-rear direction may be restricted. When one of the two directions is an oblique direction, the other direction is a direction that is substantially perpendicular to the oblique direction. The two directions that are substantially perpendicular to each other indicate the respective direction components, and do not necessarily indicate only the two directions that are orthogonal to each other.

  In addition, as an external load input to the seat back to cause relative displacement between both the frame portions, in addition to a rear load accompanying a rear collision of the vehicle, a front load accompanying a front collision of the vehicle, Examples include a lateral load accompanying a side collision.

  In addition, the first approach part and the second approach part, which are components of the second frame part, are integrally formed by being cut and raised from the second frame part or bent, and are separate parts from each other. The separate structure to be formed may be formed by being combined with the second frame portion by welding or the like. In addition, the first approach part and the second approach part of the second frame part may be provided at different positions in the second frame part. It may be configured to fulfill. Similarly, the first approach part and the second approach part, which are constituent elements of the first frame part, are integrally formed by being cut and raised or bent from the first frame part. The separate structure to be formed may be formed by being combined with the first frame portion by joining such as welding. The first approach part and the second approach part of the first frame part may be provided at different positions in the first frame part, but the functions of both approach parts are controlled by parts common to each other. It may be configured to fulfill. Moreover, these 1st approach site | parts and 2nd approach site | parts may be combined so that it may contact | abut in the form of contact | abutting by a line contact or a point contact other than what contact | abuts in the form of surface contact mutually.

  Moreover, the weak part formed in a 2nd frame part may consist of a notch part and a thin part other than a level | step-difference part. Moreover, the structure by which the weak part is not formed in the 2nd frame part may be sufficient. In addition, the first approaching portion that is in a relationship of moving relatively closer to each other of the both frame portions may be formed with a protruding shape in either one of which closes the gap with the other side, A protruding shape may be formed. In addition, the second approaching portion that has a relationship of moving relatively close to each other of the two frame portions may also have a shape that protrudes into a shape that closes the gap with the other party on either side, A protruding shape may be formed.

  Further, the enlarged diameter portion as the second approaching portion formed in the partial region of the rod is not limited to the end portion in the axial direction of the rod, but may be formed in the partial region in the axial direction. The diameter-expanded portion may be provided so as to restrict the movement of the first frame portion to the outside in the sheet width direction, as well as the movement of the first frame portion to the inside in the sheet width direction. The rod is not limited to a circular cross section, and may be a square cross section or other irregular cross section.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 3 Seat cushion 4 Recliner 4A Dowel 5 Slide rail 6 Seat lifter 6A Front link 6A1 Bush 6A2 Connection shaft 6B Rear link 6B1 Bush 6B2 Connection shaft 6C Drive unit 20 Back frame 21 Side frame 22 Upper frame 30 Cushion frame 31 (Second frame part)
31A Body region 31B Connection region 31Ba Fastening hole 31Bb Weld nut 31C Stepped portion (fragile portion)
31D Upper flange portion 31E Lower flange portion 32 Front panel 33 Front pipe 34 Rear pipe 34A Reduced diameter portion 35 Bush (rod)
35A cylindrical part (first approaching part)
35B Flange (expanded part, second approach part)
36 Spacer 40 Reclining plate (support frame)
41 Dowel hole 42 Fastening hole 43 Projection (projection part, first approach part, second approach part)
43A Bending part B1, B2 Bolt RS Displacement restricting structure TL Gap TW Gap F Floor (vehicle body)

Claims (11)

A vehicle seat having a first frame part for supporting a seat back, and a second frame part provided side by side in a specific direction with the first frame part,
A displacement regulating structure that regulates relative displacement between the first frame portion and the second frame portion by contact when an external load is input to the seat back;
In the displacement restricting structure, the first abutting structure that abuts the first approaching portions that are in a relatively close moving relationship between the two frame portions, and the abutting direction of the first abutting structure are substantially the same. A second abutting structure that abuts the second approaching portions that are in a relation of relatively moving relative to each other when the relative displacement between the both frame portions occurs also in a vertical direction; A vehicle seat that is configured to have. The vehicle seat according to claim 1,
The first frame portion may cause relative displacement in two directions, a seat width direction and a direction substantially perpendicular to the seat width direction, with respect to the second frame portion due to an external load input to the seat back. Vehicle seat that is configured. The vehicle seat according to claim 2,
The first frame portion and the second frame portion are connected to each other at a plurality of locations in a direction substantially perpendicular to the seat width direction, and when an external load is input to the seat back, the first frame portion and the second frame portion are For a vehicle in which the frame portion is configured to cause the relative displacement in a manner in which the frame portion rotates in a direction substantially perpendicular to the seat width direction from any one of the plurality of connection locations with respect to the second frame portion. Sheet. The vehicle seat according to any one of claims 1 to 3,
The first approach part and the second approach part, which are constituent elements of the second frame part, are configured as an integral part composed of one part, and the first approach part is a constituent element of the first frame part. The vehicle seat in which the part and the second approaching part are also formed as a single component composed of one part. The vehicle seat according to any one of claims 1 to 4,
The first approaching parts constituting the first contact structure are arranged apart from each other in the initial state, and the second approaching parts constituting the second contact structure are also separated from each other in the initial state. Vehicle seats that are supposed to be placed. The vehicle seat according to any one of claims 1 to 5,
The second frame portion includes a main body portion that forms a side skeleton of the seat cushion and is connected to the first frame portion in the seat width direction, and projects from the main body portion in the seat width direction to A tubular portion bridged between both side skeletons,
The outer peripheral surface of the tubular portion is a component of the first abutting structure that is disposed so as to face the first approaching portion of the first frame portion in a direction substantially perpendicular to the seat width direction. A diameter-enlarged portion formed on the outer peripheral surface and expanded toward the outside in the radial direction is a component of the second abutting structure that abuts the second approaching portion of the first frame portion in the seat width direction. Vehicle seats. The vehicle seat according to any one of claims 1 to 6,
A vehicle seat in which at least one of the first approaching portions constituting the first contact structure projects into a shape that closes a gap with a counterpart. The vehicle seat according to claim 7,
A vehicle seat in which at least any one of the second approaching portions constituting the second contact structure protrudes into a shape that closes a gap with a counterpart. The vehicle seat according to claim 7 or claim 8,
The first approach part of the first frame part is configured as a projecting part partially projecting toward the first approach part of the second frame part, and the projecting part is the first part of the second frame part. A vehicle seat configured to abut against both an approaching part and the second approaching part. The vehicle seat according to any one of claims 1 to 9,
The first frame portion is disposed at an outer position in the seat width direction of the second frame portion, and the second approach portion of the second frame portion is seat width wider than the second approach portion of the first frame portion. A vehicle seat disposed at a position outside the direction. The vehicle seat according to any one of claims 1 to 10, wherein
A vehicle seat in which a fragile portion is formed in the second frame portion so that a local stress concentration is caused by an external load input to the seat back to easily cause a relative displacement between the two frame portions.

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