JP6555147B2 - Vehicle seat - Google Patents

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 arranged in a direction substantially perpendicular to the first frame portion and the seat width direction.

  Conventionally, in a vehicle seat, when a heavy load caused by a collision of a vehicle is input to the seat back, a deformation regulation structure is provided to prevent the seat shape from collapsing and suppressing excessive collapse of 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, when the reclining plate is largely separated from the rear rod in the above-described prior art, the distance until the reclining plate comes into contact with a large load is increased, and there is a possibility that displacement regulation of the reclining plate with respect to the lower arm cannot be appropriately performed. 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 direction substantially perpendicular to the first frame portion and the seat width direction. A displacement regulating structure that regulates relative displacement in a direction substantially perpendicular to the seat width direction between the first frame portion and the second frame portion when an external load is input to the seat back is provided. The displacement regulating structure is provided in one of the two frame portions and protrudes in a direction approaching the other, and in the direction provided in the other of the two frame portions and approaching the protruding portion. An extension portion that extends, and the protruding portion abuts the extension portion in a direction substantially perpendicular to the seat width direction to restrict relative displacement between the two frame portions. .

  According to the first aspect of the present invention, when a relative displacement occurs between the two frame portions due to an external load input to the seat back, the configuration of the protruding portion formed on one of the two frame portions is utilized. The above-mentioned relative displacement can be regulated by bringing the extended portion extending from the other of the frame portions into contact with the protruding portion. By the above restriction, 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 distance between the protruding portion and the extending portion that is separated in the direction substantially perpendicular to the sheet width direction is smaller than the distance between the frame portions facing in the direction substantially perpendicular to the sheet width direction. .

  According to the second aspect of the invention, when an external load is input to the seat back, the projecting portion and the extending portion are brought into contact with each other at a stage before one and the other of the frame portions contact each other. Thus, the relative displacement can be regulated.

  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 fourth 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 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 first frame portion is disposed opposite to the outer peripheral surface of the tubular portion in a direction substantially perpendicular to the seat width direction. The projecting portion is configured by a diameter-enlarged portion that is expanded radially outward from the outer peripheral surface of the tubular portion, while the extending portion is a main body in a direction substantially perpendicular to the seat width direction in the first frame portion. It extends to the part and extends along the sheet width direction, and is arranged to be opposed to the enlarged diameter portion.

  According to the fourth aspect of the invention, the first frame portion is substantially perpendicular to the seat width direction with respect to the second frame portion by utilizing the configuration of the tubular portion that integrally has the enlarged diameter portion as the protruding portion. It is possible to simply and appropriately regulate the relative displacement by applying a force in the direction, and appropriately suppress the deformation of the sheet shape. Further, the extended part can be stably brought into contact with the protruding part over a wide range in the sheet width direction.

  The fifth invention is the following structure in the fourth invention described above. The enlarged-diameter portion has an arc shape that forms an outer peripheral shape that is concentrically curved with the outer peripheral surface of the tubular portion. And the extension site | part arrange | positioned facing the position of the radial direction outer side of the said enlarged diameter part is set as the structure which has the inner peripheral shape curved along the circular arc shape of the enlarged diameter part.

  According to the fifth aspect of the present invention, since the gap formed between the extension portion and the diameter-expanded portion is constant in the circumferential direction, the direction of relative displacement generated between both frame portions is shifted in the circumferential direction. Can also be regulated by bringing them into contact with each other properly.

  The sixth invention is the following structure in the fourth invention described above. The extending part disposed opposite to the radially outer position of the enlarged diameter part is configured to face a flat surface toward the enlarged diameter part.

  According to the sixth aspect of the present invention, the extension portion can be formed more easily than the case where the extension portion is bent. Therefore, it is effective when it is not necessary to consider the deviation in the circumferential direction with respect to the enlarged diameter portion of the extension portion. is there.

  A seventh invention is the following configuration according to any one of the first to seventh inventions described above. The first frame portion is disposed at an outer position in the seat width direction of the second frame portion, and the projecting portion of the second frame portion is formed at a position outside the seat width direction of the first frame portion and extends. The portion extends to a position where the protruding portion and the sheet width direction face each other in a substantially vertical direction.

  According to the seventh aspect of the present invention, the configuration of the projecting portion formed at a position outside the first frame portion of the second frame portion outside the seat width direction is used, and the second frame portion in the seat width direction is used. It is possible to appropriately restrict the movement of the first frame portion arranged at the outer position relative to the direction substantially perpendicular to the seat width direction by the input of an external load.

  The eighth invention is the following configuration in any of the first to seventh inventions 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 eighth 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. FIG. 4 is an 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. It is an enlarged view showing schematic structure of the vehicle seat of Example 2 by the side view corresponding to 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 (vehicle body) 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. Specifically, among the reclining plates 40 constituting the displacement regulating structure RS, the left reclining plate 40 arranged on the outer side in the vehicle width direction is brought close to the outer peripheral surface of the corresponding bush 6B1 on the same side. It is arranged and comes into contact with the outer peripheral surface of the bush 6B1 at an early stage of deformation so that the progress of the deformation can be stopped at an early stage.

  On the other hand, as shown in FIG. 4 and FIGS. 6 to 7, the right reclining plate 40 arranged on the inner side in the vehicle width direction has a corresponding bush 35 (6B1) on the same side on the outer side in the axial direction. Since the ring-shaped flange portion 35B projecting outward in the radial direction is formed at the end portion, in order to avoid interference with the bush 35 during assembly, the outer surface of the cylindrical portion 35A of the bush 35 is The distance is set to be separated. The above-described configuration will be described in more detail. If the above-described reclining plate 40 is shaped so as to be too close to the outer peripheral surface of the cylindrical portion 35A of the bush 35 on the corresponding side, the flange portion 35B of the bush 35 and It becomes easy to cause shape interference. Therefore, the reclining plate 40 described above has a shape in which the distance from the outer peripheral surface of the cylindrical portion 35A of the bush 35 described above is separated to a position where the above-described flange portion 35B and the radial arrangement do not overlap with each other. Has been.

  However, the reclining plate 40 extends toward the outer peripheral surface of the cylindrical portion 35A of the bush 35 and extends to the outer peripheral surface of the cylindrical portion 35A of the bush 35, and on the flange portion 35B of the bush 35. And a protruding portion 43 that is bent and extended to the outside in the sheet width direction up to a position facing in the radial direction. Due to the protrusion 43, the above-described right reclining plate 40 is reclined between the above-mentioned portions where the protrusion 43 and the flange 35B are opposed to each other in the radial direction. The gap TL2 is narrower than the gap TL1 between the plate 40 and the spacer 36 attached to the cylindrical portion 35A of the bush 35. Accordingly, the right reclining plate 40 is also brought into close contact with the outer peripheral surface of the corresponding bush 35 on the same side, and comes into contact with the outer peripheral surface (flange portion 35B) of the bush 35 at an early stage of deformation, so that the deformation can be quickly performed. Progress can be stopped.

  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 “tubular portion” of the present invention. Further, the flange portion 35B of the bush 35 corresponds to the “projection part” and the “diameter expansion part” of the present invention. Further, the protrusion 43 formed on the reclining plate 40 corresponds to the “extension part” 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 above-described bush 35 protrudes to the right side (outside in the seat width direction) which is on the inner side in the vehicle width direction than the bottom portion of the reclining plate 40 facing the outer peripheral surface of the cylindrical portion 35A. The flange portion 35B is positioned 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.

  Specifically, as shown in FIGS. 6 to 9, the right reclining plate 40 which is the inner side in the vehicle width direction extends from the bottom side portion thereof to the inner side in the vehicle width direction with respect to the bush 35 on the corresponding side. The protrusion 43 comes into contact with the flange portion 35B of the bush 35 by the approach movement, so as to prevent the movement in the approach direction at an early stage. As shown in FIG. 8, the protrusion 43 is configured so that each reclining plate 40 rotates 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 when the large load is input. As a result, it is formed at a position on the movement locus where it comes into contact with the outer peripheral surface of the flange portion 35B of the bush 35 by rotating forward and downward.

  More specifically, the protrusion 43 has a shape extending inward in the vehicle width direction (outside in the seat width direction) than the flange portion 35B of the bush 35 described above, and the flange portions 35B are disposed on both sides in the seat width direction. It is provided in a straddling state. The protrusion 43 has a configuration in which a portion surface facing the flange portion 35B in the radial direction is bent so as to have an arcuate inner peripheral shape curved along the arc shape of the flange portion 35B. It is said that. By adopting such a configuration, the protrusion 43 is configured such that the radial gap between the protrusion 43 and the flange portion 35B is uniform in the circumferential region where they face each other in the radial direction. ing. Therefore, even when the direction in which the projection 43 moves toward the flange portion 35B when the large load is input may deviate to some extent in the height direction, the approach movement always proceeds by the size of the gap. The protruding portion 43 can be brought into contact with the flange portion 35B without variation.

<Summary>
In summary, the sheet 1 of the present embodiment has the following configuration. That is, the first frame part (reclining plate 40) that supports the seat back (seat back 2) and the second frame part (cushion frame 30) provided side by side in a direction substantially perpendicular to the first frame part and the seat width direction. A vehicle seat having a lower arm 31), and a seat width direction 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 relative displacement in a substantially vertical direction is provided. The displacement regulating structure is provided on one of the frame portions (the bush 35 provided on the cushion frame 30) and a protruding portion (flange portion 35B) protruding in a direction approaching the other (the reclining plate 40). And an extension part (protrusion part 43) provided in the other of the frame parts and extending in a direction approaching the protrusion part, the protrusion part being in the seat width direction with respect to the extension part Is configured to restrict relative displacement between both frame portions by abutting in a substantially vertical direction.

  With such a configuration, when relative displacement occurs between the two frame portions (the lower arm 31 and the reclining plate 40) due to an external load input to the seat back (seat back 2), Utilizing the configuration of the protruding portion (flange portion 35B) formed on one of them (bush 35), the extending portion (projecting portion 43) extending from the other (reclining plate 40) of the two frame portions is used as the protruding portion. The above-mentioned relative displacement can be regulated by making it contact. By the above restriction, 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 distance (gap TL2) between the protruding portion (flange portion 35B) and the extending portion (projecting portion 43) that is separated in the direction substantially perpendicular to the seat width direction is the both frame portions (lower arm 31 and reclining plate). 40) is configured to be smaller than a distance (gap TL1) facing each other in a direction substantially perpendicular to the sheet width direction. With this configuration, when an external load is input to the seat back (seat back 2), one (bush 35) and the other (reclining plate 40) of the two frame portions are in contact with each other. Relative displacement can be regulated by bringing the projecting portion and the extending portion into contact with each other at the stage before contact.

  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.

  The second frame portion (cushion frame 30) is a main body portion (side cushion of the seat cushion 3) that is connected to the first frame portion (reclining plate 40) in the seat width direction. Lower arm 31) and a tubular portion (bush 35) that protrudes from the main body portion in the seat width direction and is bridged between both side skeletons (both lower arms 31) of the seat cushion. The first frame portion is disposed opposite to the outer peripheral surface of the tubular portion in a direction substantially perpendicular to the seat width direction. The protruding portion (flange portion 35B) is configured by a diameter-enlarged portion that is expanded radially outward from the outer peripheral surface of the tubular portion, while the extending portion (projection portion 43) is a seat in the first frame portion. It is configured to extend toward the main body in a direction substantially perpendicular to the width direction and to extend along the sheet width direction and to be opposed to the enlarged diameter portion. By adopting such a configuration, the first frame portion is substantially the same as the seat width direction with respect to the second frame portion by utilizing the configuration of the tubular portion integrally having the enlarged diameter portion as the protruding portion. It is possible to simply and appropriately regulate the relative displacement by applying a force in the vertical direction, and appropriately suppress the deformation of the sheet shape. Further, the extended part can be stably brought into contact with the protruding part over a wide range in the sheet width direction.

  Further, the enlarged diameter portion (flange portion 35B) has an arc shape that forms an outer peripheral shape concentrically curved with the outer peripheral surface of the tubular portion (bush 35). And the extension part (protrusion part 43) arrange | positioned facing the position of the radial direction outer side of the diameter expansion part is set as the structure which has the inner peripheral shape curved along the circular arc shape of the diameter expansion part. Yes. By adopting such a configuration, the gap (gap TL2) formed between the extension part and the enlarged diameter part is constant in the circumferential direction, so both frame parts (the lower arm 31 and the reclining plate 40). Even if the direction of the relative displacement generated between them deviates in the circumferential direction, the two can be appropriately brought into contact and regulated.

  In addition, the extended portion (projection portion 43) arranged to face the radially outer position of the enlarged diameter portion (flange portion 35B) is configured to face a flat surface toward the enlarged diameter portion. By adopting such a configuration, the extension part can be formed more easily than the case where the extension part is bent, so that it is not necessary to consider the deviation in the circumferential direction with respect to the enlarged part of the extension part. It is valid.

  Further, the first frame portion (reclining plate 40) is disposed at the outer position in the seat width direction of the second frame portion (lower arm 31 of the cushion frame 30), and the protruding portion (flange portion 35B) of the second frame portion is provided. The first frame portion is formed at a position outside the sheet width direction, and the extending portion (projecting portion 43) extends to a position where the protruding portion and the sheet width direction are opposed to each other in a substantially vertical direction. . By adopting such a configuration, the seat width of the second frame portion can be obtained by utilizing the configuration of the protruding portion formed at a position outside the first frame portion of the second frame portion in the seat width direction. The movement of the first frame portion arranged at the position outside the direction relative to the direction substantially perpendicular to the seat width direction by the input of an external load can be appropriately restricted.

  Further, local stress concentration is caused 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 fragile portion (stepped portion 31 </ b> C) that facilitates relative displacement is formed therebetween. 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 FIG. In the present embodiment, the protrusion 44 (extension part) formed on the reclining plate 40 arranged on the right side which is the inner side in the vehicle width direction is opposed to the flange part 35B (protrusion part) of the bush 35 in the radial direction. The part surface is formed so as to face a straight flat surface toward the flange portion 35B. With such a configuration, the protrusion 44 can be easily formed. The protrusion 44 has a shape that extends to the inner side in the vehicle width direction (outer side in the seat width direction) than the flange part 35B of the bush 35 described above, like the protrusion 43 shown in the first embodiment. The flange portion 35B is provided in a state straddling both sides in the sheet width direction. 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.

  Further, the second frame part is not limited to the skeleton element of the 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 of the second frame portion that contacts the first frame portion is not limited to the outer peripheral surface of the cylindrical member such as the bush shown in the above-described embodiment, but the outer peripheral surface of the rectangular tube-shaped member, and others. The structure surface of the member which has the shape may be sufficient. In addition to the reclining plate, the first frame portion that supports the seat back may be composed of various members that support the seat back such as a side frame of the seat back or a bracket connected to the side frame.

  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 manner by welding. There may be. Further, the second frame portion and the first frame portion may be provided in a state where the projecting portion and the extending portion are in contact with each other in an initial state before an external load is input. . Further, the protruding portion provided on one of the frame portions is formed at a position facing the other of the frame portions, and the extending portion protruding from the other does not extend in the seat width direction. The sheet width direction may be opposed to the substantially vertical direction, and may be configured to contact the protruding portion when an external load is input.

  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. May regulate the relative displacement in a substantially vertical direction, that is, in any one of the seat height direction and the seat front-rear direction. Moreover, the diagonal direction containing the said direction component may be sufficient. 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 projecting part and the extending part are formed integrally by being cut and raised from the second frame part or the first frame part or bent, and other parts are combined by joining such as welding. It may be done. Further, the protruding portion and the extending portion may be combined so as to be in contact with each other in line contact or point contact, in addition to the contact in surface contact with each other.

  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.

  Moreover, the diameter-enlarged part as a projecting part formed in a partial region of the tubular part is not limited to the axial end of the tubular part, but may be formed in a 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 tubular portion 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 (tubular portion)
35A Cylindrical part 35B Flange part (projection part, diameter expansion part)
36 Spacer 40 Reclining plate (support frame)
41 Dowel hole 42 Fastening hole 43 Projection (extension part)
44 Protrusion (extension part)
B1, B2 Bolt RS Displacement restricting structure TL1 Clearance TL2 Clearance F Floor

Claims (8)

A vehicle seat having a first frame portion that supports a seat back, and a second frame portion that is provided in a direction substantially perpendicular to the first frame portion and the seat width direction,
A displacement regulating structure that regulates relative displacement in a direction substantially perpendicular to a seat width direction between the first frame portion and the second frame portion when an external load is input to the seat back; ,
The displacement regulating structure is provided on one of the two frame portions and protrudes in a direction approaching the other, and is provided on the other of the two frame portions and faces the protruding portion. An extension part extending in the approaching direction, and the projecting part abuts the extension part in a direction substantially perpendicular to the seat width direction, thereby causing relative displacement between the two frame parts. Vehicle seats that are supposed to be regulated. The vehicle seat according to claim 1,
The distance between the projecting portion and the extending portion that is separated in the direction substantially perpendicular to the seat width direction is smaller than the distance between the frame portions facing in the direction substantially perpendicular to the seat width direction. Vehicle seats that are used. 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 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 first frame portion is disposed opposite to the outer peripheral surface of the tubular portion in a direction substantially perpendicular to the seat width direction.
While the protruding portion is constituted by a diameter-expanded portion that is expanded from the outer peripheral surface of the tubular portion toward the radially outer side,
The extending portion extends toward the main body portion in a direction substantially perpendicular to the seat width direction in the first frame portion, extends along the seat width direction, and is disposed opposite the enlarged diameter portion. A vehicle seat that is configured to be made. The vehicle seat according to claim 4,
The diameter-expanded portion has an arc shape that forms an outer peripheral shape that is concentrically curved with the outer peripheral surface of the tubular portion, and the extension portion that is disposed to face a radially outer position of the diameter-expanded portion is the A vehicle seat configured to have an inner circumferential shape that is curved along an arc shape of an enlarged diameter portion. The vehicle seat according to claim 4,
The vehicle seat, wherein the extended portion disposed opposite to the radially outer position of the enlarged diameter portion has a flat surface facing the enlarged diameter portion. The vehicle seat according to any one of claims 1 to 6,
The first frame portion is disposed at a position outside the second frame portion in the seat width direction, and the protruding portion of the second frame portion is formed at a position outside the first frame portion in the seat width direction. The vehicle seat is configured such that the extending portion extends to a position facing the protruding portion and a direction substantially perpendicular to the seat width direction. The vehicle seat according to any one of claims 1 to 7,
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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