JP2017210047A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately suppress a reclining plate from being peeled off from a recliner coupled thereto at the time when a large load is inputted thereto.SOLUTION: A seat 1 has a reclining plate 40 which is coupled to a lower frame 31 forming a framework of a seat cushion 3 and connected through a recliner 4 to a back frame 20 forming a framework of a seat back 2. In the reclining plate 40, at an edge part at a rear side, where the reclining plate receives compressed loads in a downward direction from welded portions thereof with the dowels 4A, coupled portions thereof to the recliner 4, with a fastened position of a bolt B2 at which the plate is coupled to the lower arm 31 as a supporting point, by an external load to be inputted to the seat back 2, is provided a reinforcement part 45 which enhances buckling strength of the reclining plate 40.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 reclining plate coupled to a lower arm constituting a skeleton of a seat cushion and connected to a seat back frame constituting a skeleton of a seat back via a recliner.

  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, in the above-described conventional technology, the reclining plate may be deformed due to an overload due to the input of the large load described above, and the welded portion with the recliner may be peeled off. The present invention was devised as a solution to the above problem, and the problem to be solved by the present invention is to appropriately prevent the reclining plate from being detached from the coupled state with the recliner when a heavy load is input. Is to be able to.

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

  1st invention is a vehicle seat which has a reclining plate connected with the lower arm which comprises the frame | skeleton of a seat cushion, and connected with the seat back frame which comprises the frame | skeleton of a seat back via a recliner. With respect to the reclining plate, the reclining plate is placed in a region that receives a compressive load in a direction substantially perpendicular to the seat width direction from the connecting portion with the recliner with the connecting portion with the lower arm as a fulcrum by an external load input to the seat back. A reinforcing portion is provided to increase the buckling strength of the.

  According to the first invention, it is possible to suppress the reclining plate from being buckled and deformed by an external load input to the seat back. Therefore, it is possible to appropriately prevent the reclining plate from being detached from the coupled state with the recliner when a large load is input.

  The second invention is the following configuration in the first invention described above. A long structure in which the reinforcing portion extends in the length direction of a line segment extending in a direction substantially perpendicular to the seat width direction connecting the connecting portion of the reclining plate with the lower arm of the reclining plate and the central portion of the recliner connected to the reclining plate. It is said that.

  According to the second invention, the buckling strength of the reclining plate can be appropriately increased over a wide range without enlarging the reinforcing portion more than necessary.

  The third invention is the following configuration in the second invention described above. In the region in the length direction of the line segment, the reinforcing portion is provided so as to straddle the connecting portion between the reclining plate and the recliner passing through the region in the length direction.

  According to the third aspect of the present invention, it is possible to more appropriately suppress the reclining plate from being detached from the coupled state with the recliner when a large load is input.

  The fourth invention is the following structure in the third invention described above. The reinforcing part has a shape extending in the length direction toward the joint part up to a middle region until reaching the joint part with the lower arm of the reclining plate.

  According to the fourth aspect of the invention, it is possible to easily control the deformation so that the reclining plate can be buckled and deformed by concentrating the stress between the intermediate portion where the reinforcing portion extends and the joint portion of the lower arm. .

  According to a fifth invention, in any of the first to fourth inventions described above, the following configuration is adopted. The reinforcing part is formed as a bent part in the sheet width direction formed at the edge of the reclining plate.

  According to the fifth aspect, the reinforcing portion can be formed simply and rationally.

  A sixth invention is the following configuration in any of the first to fifth inventions described above. The reclining plate is coupled to the recliner at a position rising from the coupling portion with the lower arm in the seat upward direction. The reinforcement part is provided in the edge part of the back side of a reclining plate.

  According to the sixth aspect of the invention, it is possible to set a reinforcing portion that can appropriately suppress buckling deformation at the time of a rear collision of a vehicle that is subjected to a particularly large compression load on the reclining plate.

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 as viewed in IV of FIG. 1. 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 corresponding to FIG. 6 showing the compression load applied to a reclining plate by the heavy load input into the seat back.

  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. 1, the above-described seat back 2 includes a back frame 20 that constitutes a skeleton of a 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.

<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 the R. Yes.

  By the way, as shown in FIGS. 2-6, 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 lower arm 31 has the above-described reclining plate 40 coupled to 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 disc-shaped recliner 4 coupled to the inner side surface of each reclining plate 40 assembled to these outer side surface portions. 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, as shown in FIGS. 2 to 4 and 6, each reclining plate 40 is arranged in a state in which the surface is directed in the seat width direction, and the bottom region of each of the lower arms 31 described above is disposed. It is formed in a substantially triangular flat plate shape that is assembled in a state of being superimposed at an obliquely upward angle posture with respect to the connection region 31B. Specifically, in each reclining plate 40, the upper region 40A coupled to each of the recliners 4 is offset inward in the seat width direction with respect to the lower region 40B coupled to the connection region 31B of each lower arm 31. The shape is bent into a crank shape.

  Each of the reclining plates 40 described above is set such that the lower region 40B thereof is overlapped from the outside in the seat width direction with respect to the connection region 31B of each of the lower arms 31 described above, and two bolts B1 at the front and rear thereof. , B2 to be firmly and integrally coupled. Specifically, each reclining plate 40 described above has round holes that are aligned with the corresponding fastening holes 31Ba formed in the connection regions 31B described above at the two corners in the front and rear portions of the lower region 40B. A fastening hole 42 having a shape 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, and then the fastening holes 42, The bolts B1 and B2 are inserted from the outside in the seat width direction so as to penetrate 31Ba, and are screwed and fastened to the respective weld nuts 31Bb, so that they are integrally assembled to the connection region 31B of each lower arm 31.

  Further, each of the reclining plates 40 described above is joined to the inner side surface portion of the upper region 40A by integrally welding the corresponding outer side surface portion of each recliner 4. Specifically, each of the above-described reclining plates 40 is provided with three arcuate dowels 4A arranged in the circumferential direction so as to protrude from the outer surface portions of the corresponding recliners 4 coupled thereto, respectively. Corresponding three arc-shaped dowel holes 41 that can be fitted from the inside in the direction are formed through. 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. Each of the dowels 4A described above and the corresponding dowel hole 41 fitted and welded to each of the dowels 4A are circumferentially positioned at the same circumferential position drawn around the central portion 4R serving as the rotation center of each recliner 4. It is in a state of being formed side by side at equal intervals.

  Further, at the rear edge of each reclining plate 40, a reinforcing portion 45 is formed that is bent so as to protrude substantially vertically toward the outside in the seat width direction. As shown in FIG. 6, these reinforcing portions 45 are bent in a substantially uniform shape on the outer side in the sheet width direction from the upper region 40 </ b> A to the lower region 40 </ b> B at the rear edge of each reclining plate 40. It is formed into a vertically extending substantially flat plate shape. With the above-described configuration, each reinforcing portion 45 is connected to the fastening portion of the rear bolt B2 that is a connecting portion with the connection region 31B of each lower arm 31 of each reclining plate 40, and each recliner 4 coupled to each reclining plate 40. The center portion 4R has a long shape extending in the length direction of the line segment L extending in the height direction connecting the center portion 4R.

  Specifically, the reinforcing portion 45 is provided in each of the lower two dowels 4A and the dowels in the region in the length direction in which the line segment L extends, which is a connecting portion between the reclining plate 40 and the recliner 4 passing through the region. A portion formed by welding with the hole 41 is formed so as to straddle the length direction in which the line segment L extends. In addition, the reinforcing portion 45 extends in the length direction in which the line segment L extends to reach the fastening position of the rear bolt B2 that is a connecting portion between each reclining plate 40 and the connection region 31B of each lower arm 31. However, it has a shape that extends only to the middle region reaching the lower region 40B.

  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.

  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.

  Further, when a large rearward load due to the occurrence of a rear collision or the like of the vehicle is input to the seat back 2 as described above, each reclining plate 40 that supports the seat back 2 described above is applied to the reclining plate 40 described above, as shown in FIG. On the other hand, a load of a strong bending moment that is to be twisted backward around the central portion 4R of each recliner 4 is applied from a welded portion with each dowel 4A that is a coupling portion with each recliner 4. Due to the load described above, each reclining plate 40 has a fastening position of the rear bolt B2 that is a coupling portion with each lower arm 31 as a fulcrum, and a downward direction in a region behind the coupling portion with each recliner 4. A strong compressive stress that is pushed into the body is applied.

  However, each of the reclining plates 40 is formed with a reinforcing portion 45 that acts on the rear edge of the reclining plate 40 so as to increase the buckling strength of the rear region of the reclining plate 40. With the above-described configuration, each reclining plate 40 is less likely to buckle and deform in a region in the length direction of the line segment L where each reinforcing portion 45 is formed, even if the above-described compressive stress is applied. However, each reclining plate 40 has a lower region 40B where each reinforcing portion 45 is interrupted, that is, between the fastening portion of the rear side bolt B2 that is a connecting portion between the reinforcing portion 45 of each reclining plate 40 and each lower arm 31. In the region where each reinforcing portion 45 is not formed, compressive stress due to a decrease in buckling strength is concentrated, and the region where the width in the front-rear direction is the narrowest is bent outward in the seat width direction as a buckling line BL. It is designed to buckle and deform. Due to the buckling deformation, each reclining plate 40 can appropriately absorb the energy of the external load input to the seat back 2.

<Summary>
In summary, the sheet 1 of the present embodiment has the following configuration. In other words, the recliner (recliner 4) is coupled to the lower arm (lower arm 31) constituting the skeleton of the seat cushion (seat cushion 3) and the seat back frame (back frame 20) constituting the skeleton of the seat back (seat back 2). It is the vehicle seat (seat 1) which has the reclining plate (reclining plate 40) connected through this. The recliner (recliner 4) is connected to the recliner (recliner 4) with a connecting portion (fastening position of the bolt B2) to the lower arm (lower arm 31) by an external load input to the seat back (seat back 2). The reclining plate (reclining plate 40) is placed in a region (rear region) on the side that receives a compressive load in a direction (downward) substantially perpendicular to the seat width direction from the joint (welded portion with each dowel 4A). A reinforcing portion (reinforcing portion 45) that increases the buckling strength is provided.

  With such a configuration, it is possible to suppress the reclining plate (the reclining plate 40) from being buckled and deformed by an external load input to the seat back (the seat back 2). Therefore, it is possible to appropriately suppress the reclining plate (reclining plate 40) from being detached from the coupled state with the recliner (recliner 4) when a large load is input.

  Further, the reinforcer (reinforcement part 45) is connected to the recliner plate (recliner plate 40) with the lower arm (lower arm 31) (the fastening part of the bolt B2) and the recliner (recliner plate 40) coupled to the recliner (recliner plate 40). The recliner 4) has a long structure extending in the length direction of a line segment (line segment L) extending in a direction substantially perpendicular to the sheet width direction connecting the center portion (center portion 4R). By adopting such a configuration, the buckling strength of the reclining plate (reclining plate 40) is set to the length of the line segment (line segment L) without enlarging the reinforcing part (reinforcing part 45) more than necessary. The direction can be appropriately increased over a wide range.

  Further, in the region in the longitudinal direction of the line segment (line segment L), the reinforcing portion (reinforcing portion 45) is a connecting portion between the reclining plate (reclining plate 40) and the recliner (recliner 4) passing through the region. It is provided so as to straddle (welded portion with each dowel 4A) in the length direction. With such a configuration, it is possible to more appropriately suppress the reclining plate (the reclining plate 40) from being detached from the coupled state with the recliner (the recliner 4) when a heavy load is input.

  Further, the joint portion (bolt B2 is fastened) up to an intermediate region from the reinforcement portion (reinforcement portion 45) to the joint portion (fastening position of the bolt B2) of the reclining plate (reclining plate 40) with the lower arm (lower arm 31). It is set as the shape extended in the said length direction toward a location. With such a configuration, the reclining plate (reclining plate 40) is connected to the connecting portion (the fastening point of the bolt B2) between the intermediate region in which the reinforcing portion (reinforcing portion 45) extends and the lower arm (lower arm 31). The deformation can be easily controlled so that the stress can be concentrated between the two so as to cause the buckling deformation.

  Further, the reinforcing part (reinforcing part 45) is formed as a bent part in the sheet width direction formed at the edge of the reclining plate (reclining plate 40). By setting it as such a structure, a reinforcement part (reinforcement part 45) can be formed simply and rationally.

  Further, the reclining plate (reclining plate 40) is coupled to the recliner (recliner 4) at a position where it rises in the seat upward direction from a coupling portion (a fastening position of the bolt B2) with the lower arm (lower arm 31). A reinforcing part (reinforcing part 45) is provided at the rear edge of the reclining plate (reclining plate 40). By adopting such a configuration, a reinforcing portion capable of appropriately suppressing buckling deformation at the time of rear collision of a vehicle that is subjected to a particularly large compression load on the reclining plate (reclining plate 40). (Reinforcing part 45) can be set.

<Other embodiments>
As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above 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 reclining plate may be configured to be coupled to the recliner at a position where the reclining plate does not stand up from the coupling portion with the lower arm but rises to the rear side or the lower side. Further, the recliner is overlapped and joined to the inner surface portion in the seat width direction of the reclining plate, or is overlapped and joined to the outer surface portion in the seat width direction, or the upper edge portion of the reclining plate. It may be fitted and joined from above on a fitting portion that is formed in a concave shape formed in an arc shape.

  In addition to the rear load associated with the rear collision of the vehicle, the reinforcing portion provided on the reclining plate is used with respect to the seat back such as the forward load associated with the front collision of the vehicle and the side load associated with the side collision of the vehicle. It may be provided at a position where the buckling strength can be increased with respect to a large load applied from various directions. For example, a reinforcing portion may be provided in a region in front of the joint portion of the reclining plate with the recliner with respect to a large forward load input to the seat back.

  The reinforcing portion is not necessarily formed at the edge of the reclining plate, and may be provided in the intermediate region. Further, the reinforcing portion may be one that raises the buckling strength by bending a part of the reclining plate to increase the buckling strength, or by forming streaky irregularities on a part of the reclining plate. Further, the reinforcing portion may be formed by welding another member in addition to what is formed by the shape of the reclining plate itself as described above.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 3 Seat cushion 4 Recliner 4A Dowel 4R Center part 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 Frame 31 Lower arm 31A Main body region 31B Connection region 31Ba Fastening hole 31Bb Weld nut 31C Stepped portion 31D Upper flange portion 31E Lower flange portion 32 Front panel 33 Front pipe 34 Rear pipe 34A Reduced diameter portion 35 Bushing 35A Cylindrical portion 35B Flange portion 36 Spacer 40 Reclining Plate 40A Upper region 40B Lower region 41 Dowel hole 42 Fastening hole 43 Projection 44 Projection Part 45 reinforcing portion B1, B2 bolt RS displacement restriction structure TL1 gap TL2 gap F floor L line BL buckling line

Claims (6)

A vehicle seat having a reclining plate coupled to a lower arm constituting a skeleton of a seat cushion and connected via a recliner to a seat back frame constituting a skeleton of a seat back,
A region on the reclining plate that receives a compressive load in a direction substantially perpendicular to the seat width direction from the connecting portion with the recliner with the connecting portion with the lower arm as a fulcrum by an external load input to the seat back. Further, a vehicle seat provided with a reinforcing portion for increasing the buckling strength of the reclining plate. The vehicle seat according to claim 1,
A length direction of a line segment in which the reinforcing portion extends in a direction substantially perpendicular to a seat width direction connecting a connecting portion of the reclining plate with the lower arm and a center portion of the recliner connected to the reclining plate. A vehicle seat having a long structure extending in the direction of the vehicle. The vehicle seat according to claim 2,
The vehicle seat in which the reinforcing portion is provided in a region in the length direction of the line segment so as to straddle a connecting portion between the reclining plate and the recliner passing through the region. The vehicle seat according to claim 3,
The vehicle seat, wherein the reinforcing portion has a shape extending in the length direction toward the coupling portion up to an intermediate region from the reclining plate to the coupling portion with the lower arm. The vehicle seat according to any one of claims 1 to 4,
A vehicle seat in which the reinforcing portion is formed as a bent portion in the seat width direction formed at an edge of the reclining plate. The vehicle seat according to any one of claims 1 to 5,
The reclining plate is coupled with the recliner at a position rising in the seat upward direction from the coupling portion with the lower arm,
A vehicle seat in which the reinforcing portion is provided at a rear edge of the reclining plate.

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