JP2020011578A - Support structure of vehicle seat - Google Patents

Abstract

To improve assembly workability of a seat back to a vehicle body without inducing looseness of the seat back.SOLUTION: A support structure of a vehicle seat 1 having tiltable seat backs 3, 4 includes: a pin 6a (a shaft body) which is fixed to the vehicle body and extends in a vehicle width direction; a spherical body 22 which is arranged on a side surface part 12 on an outer side of a vehicle of the seat back 3, 4 and has a mounting hole 24 extending in the vehicle width direction; and a holding part 12a which has receiving surfaces (32a, 44a) which have an arc-shaped cross section corresponding to an outer peripheral surface of the spherical body 22, and holds the spherical body 22 by the receiving surfaces so as to be capable of rolling. The seat backs 3, 4 are supported so as to be capable of swinging in a longitudinal direction with respect to the vehicle body with the pin 6a as a fulcrum by inserting the pin 6a into the mounting hole 24.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a seat structure for a vehicle such as an automobile, and more particularly to a support structure for a vehicle seat suitable for a rear seat.

  2. Description of the Related Art There is known a vehicle rear seat that includes a seat cushion and a seat back, and in which a luggage compartment can be expanded by tilting a seat back forward so as to be folded on the seat cushion. Patent Document 1 is disclosed as an example of this type of rear seat.

  The rear seat disclosed in Patent Literature 1 includes a pair of left and right seatbacks that can be split and folded. The left and right seatbacks are each supported by a vehicle body side pin fixed to a wheel house frame so as to protrude into the vehicle interior and a fixture fixed to a central portion of the vehicle body floor so as to be tiltable (swingable). . More specifically, a through hole is formed in a side portion of the seat back frame on the vehicle outside (door side), and a vehicle body side pin is inserted into the through hole. A seat-side pin is provided, and the seat-side pin is supported by a fixture. With this configuration, the left and right seatbacks are supported so as to be tiltable in the front-rear direction with respect to the vehicle body with the vehicle-side pin and the seat-side pin as fulcrums.

  Note that a cylindrical resin cap is inserted into the through hole, and the vehicle body side pin is accurately inserted inside the resin cap (referred to as a mounting hole). The outer peripheral surface of the resin cap has a mountain-shaped cross section in which tapered surfaces are formed on both sides in the width direction (both sides in the axial direction). Swingable. Therefore, when assembling the seat back to the vehicle body, by tilting the resin cap with respect to the seat back frame, that is, by tilting the mounting hole, the seat back is tilted with respect to the vehicle body side pin. Patent Document 1 describes that a vehicle body side pin can be inserted into a through hole (mounting hole) of a seat back frame, thereby simplifying an operation of assembling a seat back to a vehicle body.

Japanese Patent No. 5895743

  However, in the conventional vehicle seat disclosed in Patent Document 1, the outer peripheral surface of the resin cap has a mountain shape, and the outer peripheral surface of the resin cap and the inner peripheral surface of the through hole are in a state close to line contact. Therefore, there is a possibility that the resin cap is deformed so as to crush the crests on the outer periphery due to the load of the occupant or the like. Such a deformation forms a gap between the resin cap and the inner peripheral surface of the through-hole in which the resin cap is inserted, causing rattling of the seat back, which is one of the factors that hinder ride comfort.

  Further, since a flange portion for guiding the vehicle body side pin to the mounting hole is provided at one end of the cylindrical resin cap, if the resin cap is inclined, the flange portion hits a side surface portion of the seat back frame. Therefore, the range of angles at which the resin cap (mounting hole) can be tilted is relatively small, and it is difficult to mount the seat back to the vehicle body in a state where the seat back is largely tilted with respect to the vehicle body side pin. Therefore, it cannot be said that the conventional vehicle seat sufficiently contributes to the improvement of the assembling workability.

  The present invention has been made in view of the above circumstances, and can improve the workability of assembling a seatback to a vehicle body without inducing rattling of the seatback. It is an object of the present invention to provide a support structure.

  A support structure for a vehicle seat according to one aspect of the present invention is a support structure for a vehicle seat having a retractable seat back, the shaft body being fixed to a vehicle body and extending in a vehicle width direction; And a spherical body having a mounting hole extending in the vehicle width direction and a receiving surface having an arc-shaped cross section corresponding to the outer peripheral surface of the spherical body, and the spherical surface is rolled on the receiving surface. And a holding portion for holding the seat back so that the seat back is swingably supported in the front-rear direction with respect to the vehicle body with the shaft being a fulcrum by inserting the shaft into the mounting hole. Is what it is. In addition, "the shaft body fixed to the vehicle body and extending in the vehicle width direction" refers to both the case where the shaft body is directly fixed to the vehicle body and the case where the shaft body is fixed via a member such as a bracket. Including.

  In this support structure for a vehicle seat, the side surface of the seat back is supported by a shaft fixed to the vehicle body, and the shaft is formed into a spherical body that is rollably held on the side surface of the seat back. It is inserted into the provided mounting hole. Therefore, the range of the allowable inclination angle of the mounting hole is relatively large, and when the seatback is incorporated into the vehicle body, the shaft body can be inserted into the mounting hole with the seatback tilted more greatly. . In addition, since the spherical body is received by the receiving surface having an arc-shaped cross section corresponding to the outer peripheral surface thereof, the load is easily dispersed even when a load or the like of the occupant is applied, so that the spherical body is unlikely to be deformed (shattered). Therefore, it is possible to effectively suppress a gap from being formed between the spherical body and the holding portion (receiving surface) and causing rattling of the seat back.

  In this support structure, the spherical body includes a boss formed along an opening edge of the mounting hole, and the holding portion engages with the boss to define a rolling range of the spherical body. It is preferable to provide a regulating unit for regulating.

  According to this structure, it is possible to prevent the spherical body from rolling and the mounting hole from being hidden by the holding portion, while securing a relatively large range of the inclination angle of the mounting hole. This contributes to the improvement of the workability of assembling the seat back.

  In each of the above support structures, a tapered portion having an inner diameter that decreases from the outside to the inside of the mounting hole is formed on an inner peripheral surface of an end of the mounting hole, which is an entrance side of the shaft body. Preferably, it is provided.

  According to this structure, the leading end of the shaft body is easily guided to the mounting hole, which contributes to an improvement in workability of assembling the seat back.

  In each of the above support structures, when the side portion of the seat back is defined as a first side portion and the shaft body is defined as a first shaft portion, the seat back is in contact with the first side portion in the vehicle width direction. Is provided on a second side surface on the opposite side with a second shaft extending outward from the second side along the same axis as the first shaft, and the second portion is provided on a floor portion of the vehicle body. A support portion rotatably supporting the shaft body, wherein the second shaft portion is engaged with the support portion to restrict the second shaft portion from being displaced in the axial direction; Is preferably provided.

  According to this structure, it is possible to position the seatback at a specific position in the vehicle width direction while supporting the seatback with the first shaft inserted into the spherical body (mounting hole).

  In each of the above support structures, the first shaft body extends from the inner wall portion of the vehicle body toward the vehicle interior, and the support portion is, on the floor portion, the center of the vehicle interior in the vehicle width direction or the center thereof. It is provided in the vicinity position.

  Such a structure is often adopted for a rear row of two rows and a third row of three rows. In such a structure, it may be required to assemble the vehicle body with the seat back inclined with respect to the first shaft body. This is particularly useful when the support portion is provided on the floor portion of the vehicle body.

  According to the vehicle seat support structure according to each of the above aspects, the workability of assembling the seat back to the vehicle body can be further improved without inducing rattling of the seat back.

1 is a perspective view of a vehicle seat (rear seat) according to an embodiment of the present invention. It is a figure which shows the support structure of the seat back of a rear seat, (a) is a front view of a seat back frame, (b) is a side view of a seat back frame. It is a side view which shows the support structure of the vehicle outside of a seat back frame. FIG. 3 is an exploded perspective view showing a support structure on the vehicle outside of the seat back frame. FIG. 5 is a cross-sectional view (a cross-sectional view taken along line VV in FIG. 3) illustrating a support structure on the vehicle outside of the seat back frame. It is a perspective view for explaining the support structure inside the vehicle of the seat back frame. FIG. 3 is an exploded perspective view for explaining a support structure on the vehicle interior side of a seat back frame. FIG. 4 is an explanatory diagram illustrating a procedure for assembling a seat back to a vehicle body. It is sectional drawing of the seat back frame which shows the relationship between a spherical body (mounting hole) and a pin.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Overall configuration of vehicle seat]
FIG. 1 is a perspective view of a vehicle seat according to an embodiment of the present invention. The vehicle seat 1 shown in FIG. 1 is a rear seat used as a rear seat of the vehicle, and corresponds to a rear seat of a vehicle having two front and rear rows or a third row of a vehicle having three front and rear rows. Is what you do.

  Note that terms (directions, front and rear, left and right, etc.) relating to “direction” used in the following description are based on the vehicle seat 1 mounted on the vehicle.

  The vehicle seat 1 is a so-called splittable seat that can divide and tilt a seatback. Specifically, as shown in FIG. 1, the vehicle seat 1 includes a seat cushion 2 extending in a vehicle width direction, a left seat back 3 provided corresponding to a left area of the seat cushion 2, The seat cushion 2 includes a right seat back 4 provided corresponding to a right region of the seat cushion 2, and headrests 3a, 4a provided in the right and left seat backs 3, 4, respectively. The left seat back 3 and the right seat back 4 can be individually tilted in the front-rear direction, and are tilted forward so as to be folded on the seat cushion 2 as shown by a two-dot chain line in FIG. The luggage space can be expanded.

  The ratio of the left seat back 3 to the right seat back 4 in the vehicle width direction is 5: 5 in this example. However, this ratio is not limited to 5: 5, but may be 6: 4 or the like.

  The seat cushion 2 of the vehicle seat 1 is fixedly supported by a floor portion 7 of the vehicle body. On the other hand, the left seat back 3 and the right seat back 4 are respectively supported over a floor portion 7 of the vehicle body and an inner wall portion 6 of the vehicle body such as a wheel house frame.

[Support structure for vehicle seat (seat back)]
2A and 2B are diagrams illustrating a support structure of the left seat back 3 of the vehicle seat 1, wherein FIG. 2A is a front view of the seat back frame 10 of the left seat back 3, and FIG. It is a side view. The left seat back 3 includes a seat back frame 10 shown in FIG. 1, a seat back pad (not shown) attached to the seat back frame 10, a seat cover (not shown) that covers the seat back pad from the outside, and the like. I have.

  The seatback frame 10 is a skeleton of the left seatback 3 formed by joining a plurality of metal members such as pipe members, and has a substantially rectangular shape in a front view. On the outer side (left side) of the seat back frame 10, there is an inner wall portion 6 such as a wheel house frame swelling toward the vehicle interior, and a side portion 12 on the outer side (left side) of the seat back frame 10. Of these, the portion below the central portion in the up-down direction is offset toward the inside of the vehicle (the central portion in the vehicle width direction) with respect to the upper portion so as to avoid the bulging inner wall portion 6.

  At a position near the lower end of the side portion 12 on the vehicle outside of the seat back frame 10, a holding portion 12 a holding the spherical body 22 is provided, and a pin 6 a fixed to the inner wall portion 6 (the first shaft of the present invention) Corresponding to the body) is inserted into a mounting hole 24 (see FIG. 5) provided in the spherical body 22. Thereby, the side portion 12 on the vehicle outside of the seat back frame 10 is supported by the pin 6a so as to be able to tilt (swing) in the front-rear direction.

  3 to 5 show details of the support structure of the side portion 12 on the vehicle outside of the seat back frame 10, FIG. 3 is a side view, FIG. 4 is an exploded perspective view, and FIG. Each of the supporting structures is shown in a diagram (a cross-sectional view taken along line VV in FIG. 3).

  As shown in FIGS. 3 to 5, the side portion 12 on the vehicle outside of the seat back frame 10 has a bracket 20 formed of a metal plate having a U-shaped cross section, and a retainer 40 fixed to the bracket 20.

  The bracket 20 has a circular opening 30 penetrating in the vehicle width direction. The opening 30 is formed by, for example, burring, and an annular rising portion 32 that rises toward the inside (rightward) of the vehicle is formed around the opening 30. The inner peripheral surface of the opening 30, that is, the inner peripheral surface 32 a of the rising portion 32 has a maximum inner diameter at the position of the outer side surface of the bracket 20 (left side surface / joining surface Fa of the retainer 40 described later), and the inner side of the vehicle ( It is tapered so that the inner diameter gradually decreases toward the right side (specifically, toward the right), specifically, so as to have an arc-shaped cross section corresponding to the outer peripheral surface of the spherical body 22.

  The spherical body 22 is inserted into the opening 30 from the vehicle outside (left side) of the bracket 20, and the retainer 40 is fixed to the vehicle exterior side surface (left side surface) of the bracket 20 from outside the spherical body 22. .

  The retainer 40 is a metal plate-shaped member having a circular opening 42 penetrating in the vehicle width direction at the center. The opening 42 is formed by, for example, burring, similarly to the opening 30 of the bracket 20, and an annular rising portion 44 that rises toward the vehicle outside (left side) is formed around the opening 42. . The inner peripheral surface of the opening 42 of the retainer 40, that is, the inner peripheral surface 44 a of the rising portion 44 is formed symmetrically with the inner peripheral surface 32 a of the rising portion 32 of the bracket 20. That is, the inner peripheral surface 44a is spherical in detail so that the inner diameter is maximized at the position of the joint surface Fa with the bracket 20 in the vehicle width direction and the inner diameter gradually decreases toward the outer side (left side) of the vehicle. It is tapered so as to have an arc-shaped cross section corresponding to the outer peripheral surface of the body 22.

  The retainer 40 is integrally fixed to the bracket 20 with the spherical body 22 received in the opening 42. Specifically, the rivet R1 is inserted from the inside of the bracket 20 (right side) to the through hole 34 of the bracket 20 and the through hole 46 of the retainer 40, and is outside the retainer 40 (outside left). By caulking, the retainer 40 is fixed to the bracket 20. Thus, the spherical body 22 is inserted into the inside of the rising portion 32 of the bracket 20 and the inside of the rising portion 44 of the retainer 40, and is prevented from falling off in the vehicle width direction by the rising portions 32, 44. The spherical body 22 is held on the side portion 12 on the vehicle outside (left side) of the seat back frame 10.

  The inner peripheral surface 32a of the rising portion 32 of the bracket 20 and the inner peripheral surface 44a of the rising portion 44 of the retainer 40 are arc-shaped in cross section corresponding to the outer peripheral surface of the spherical body 22 as described above. , Can roll with respect to the side surface portion 12 of the seat back frame 10. That is, the holding portion 12 a is constituted by the rising portion 32 of the bracket 20 and the rising portion 44 of the retainer 40, and the holding portion 12 a has a receiving surface having an arc-shaped cross section corresponding to the outer peripheral surface of the spherical body 22. Then, the spherical body 22 is rotatably held by the receiving surface.

  The spherical body 22 is integrally formed of a resin material such as a POM (polyacetal resin) material or a material having excellent strength and durability, such as an oil-impregnated sintered metal. The spherical body 22 is provided with a plurality of concave portions on its surface, so that the sliding resistance between the rising portions 32 and 44 and the inner peripheral surfaces 32a and 44a of the rising portions 32 and 44 is reduced while maintaining strength and durability. It is configured.

  As shown in FIGS. 4 and 5, the spherical body 22 has, at the center thereof, a mounting hole 24 penetrating in the vehicle width direction, and the pin 6a is inserted into the mounting hole 24 as described above. Thus, the side portion 12 on the vehicle outside (left side) of the seat back frame 10 is supported by the pins 6a so as to be able to tilt (swing) in the front-rear direction. The pin 6a extends straight (without leaning back and forth) and horizontally from the inner wall portion 6 of the vehicle body in the vehicle width direction.

The spherical body 22 has an annular boss 26 along each opening edge of the mounting hole 24. When the spherical body 22 is tilted by a certain angle or more, the bosses 26 are configured such that the tip 32b of the rising portion 32 of the bracket 20 (corresponding to the restricting portion of the present invention) and the tip 44b of the rising portion 44 of the retainer 40 (the present invention). (Corresponding to the regulating portion). Thereby, the inclination angle (rolling range) of the spherical body 22 is regulated within a certain range. In our example, the angle formed by the central axis A _x2 central axis A _x1 and the pin 6a of the mounting hole 24 theta is not to exceed 30 °, the inclination angle of the spherical body 22 is adapted to be regulated ( (See FIG. 9). In other words, the spherical body 22 is allowed to be inclined when the angle θ is in the range of 0 ° to 30 °.

  6 and 7 show the support structure of the side portion 13 on the vehicle inner side (right side) of the seat back frame 10 in detail. FIG. 6 is a perspective view, and FIG. 7 is an exploded perspective view showing the support structure. Is shown.

  The side portion 13 on the vehicle interior side of the seat back frame 10 has a bracket 50 made of a metal plate. The bracket 50 is provided with a pin 52 (corresponding to a second shaft body of the present invention) extending inward (to the right) of the vehicle. As shown in FIGS. Is supported by the support member 60 provided on the floor portion 7 of the vehicle body, so that the side portion 13 on the vehicle interior side of the seat back frame 10 is supported by the support member 60 so as to be able to tilt (swing) in the front-rear direction. ing.

  The support member 60 includes a plate-shaped base portion 62 fixed to the floor portion 7 by bolts or the like (not shown), a pin support portion 64 erected at the center of the base portion 62, and fixed to the pin support portion 64. And a cover member 66 to be formed. The portion of the support member 60 other than the cover member 66 is integrally formed of a metal material.

  The pin support 64 includes a pair of pin support plates 64a (corresponding to the support of the present invention) facing each other at a predetermined interval in the vehicle width direction. The pin support plates 64a support the pins 52, the left pin support plate 64a supports the pins 52 of the left seat back 3, and the right pin support plate 64a supports the pins of the right seat back 4. 52 is supported.

  The pin support plate 64a is provided with bearing portions 65 formed of U-shaped notches that are open upward and viewed from the side, and the bearing portions 65 support the pins 52. Specifically, a peripheral groove 52a having a groove width slightly larger than the thickness of the pin support plate 64a is formed in the pin 52, and the pin 52 has the pin support plate 64a interposed in the peripheral groove 52a. It is supported by the bearing 65 in this state. Thus, the pin 52 is rotatably supported by the bearing 65 in a state where the displacement in the vehicle width direction is restricted.

  The cover member 66 is a box-shaped member made of, for example, resin and has an opening at the bottom, and is fixed to the upper end portion of the pin support portion 64 so that each pin support plate 64a (bearing portion 65) as shown in FIG. ), The pins 52 of the left and right seatbacks 3 and 4 are integrally covered from above. This prevents the pins 52 of the respective seatbacks 3 and 4 from unintentionally falling off the bearing 65. The cover member 66 is detachably fixed to the pin support 64 by bolts B1. In FIG. 2A, the right seat back 4 is omitted.

  Although the support structure of the left seat back 3 of the vehicle seat 1 has been described in detail here, the support structure of the right seat back 4 is also symmetrical left and right (that is, the right side of the right seat back 4 is on the outside of the vehicle). And the left side is the side portion 13 on the inside of the vehicle), and is basically the same as the left seat back 3. Therefore, a detailed description of the support structure of the right seat back 4 is omitted.

[Assembling of vehicle seat (seat back) to vehicle body]
FIGS. 8A to 8C are explanatory diagrams illustrating the procedure for assembling the left seat back 3 to the vehicle body. Each of FIGS. 8A to 8C is a cross-sectional view corresponding to a cross section taken along line VIII-VIII of FIG.

  In order to incorporate the left seat back 3 into the vehicle body, first, it is necessary to insert a pin 6 a projecting from the inner wall portion 6 of the vehicle body into the mounting hole 24 of the spherical body 22. In this case, when the pin 6a is inserted into the mounting hole 24 along the vehicle width direction, the pin support portion 64 of the support member 60 and the left seat back 3 interfere. Therefore, as shown in FIG. 8A, the left seat back 3 is inclined such that the side portion 13 on the inside of the vehicle is located behind the side portion 12 on the outside of the vehicle. (Left) to insert the pin 6 a into the mounting hole 24.

In this case, since the spherical bodies 22 are rollably holding the side surface portion 12, as shown in FIG. 9, even if the central axis A _x2 central axis A _x1 and the pin 6a of the mounting hole 24 is not parallel , abuts the tip of the pin 6a in the inlet portion of the mounting hole 24, if pressed on the left seat back 3 to the left in this state, naturally the central axis a _x2 central axis a _x1 and the pin 6a of the mounting hole 24 The spherical body 22 is rolled so that the two coincide with each other, whereby the pin 6a is inserted into the mounting hole 24. That is, the pin 6a can be inserted into the mounting hole 24 with the left seat back 3 inclined with respect to the pin 6a. In this case, a tapered portion 70 is provided at the tip of the pin 6a, and the tapered portion 24a is provided on the inner peripheral surface of the entrance portion of the mounting hole 24 as described above. Can be smoothly inserted while being guided.

  After the pin 6a is inserted into the mounting hole 24, the side portion 13 on the vehicle interior side of the left seat back 3 is moved forward as shown in FIG. 8B, and as shown in FIG. The pin 52 provided on the side surface 13 is supported by the pin support 64 of the support member 60. Specifically, the pin 52 is supported by the bearing 65 such that the pin support plate 64a is interposed in the circumferential groove 52a of the pin 52. When the pin 52 is supported by the bearing portion 65 in this manner, the displacement of the pin 52 in the axial direction (vehicle width direction) is restricted by the pin support plate 64a, whereby the left seat back 3 is positioned at a specific position in the vehicle width direction. Positioned.

  Here, the left seat back 3 has been described, but the right seat back 4 can be incorporated into the vehicle body in the same procedure as the left seat back 3 except that the left and right sides are different.

  After assembling the left seat back 3 and the right seat back 4 into the vehicle body, the cover member 66 is attached and fixed to the pin support 64 of the support member 60. This completes the work of attaching the seat backs 3 and 4 to the vehicle body.

  8A to 8C, an example has been described in which the seatbacks 3 and 4 are inclined such that the side portion 13 on the inside of the vehicle is located behind the side portion 12 on the outside of the vehicle. The seat backs 3 and 4 are tilted up and down so that the inner side surface portion 13 is located above the vehicle outer side portion 12, thereby causing interference between the support members 60 (pin support portions 64) and the seat backs 3 and 4. May be avoided.

[Effects, etc.]
In the support structure of the vehicle seat 1 described above, the outer side surface portions 12 of the seat backs 3 and 4 are supported by pins 6a fixed to the inner wall portion 6 of the vehicle body. 10 is inserted into the mounting hole 24 of the spherical body 22 which is held so as to be able to roll. For this reason, the allowable range of the inclination angle of the mounting hole 24 is relatively large, and when the seatbacks 3 and 4 are incorporated in the vehicle body, the seatbacks 3 and 4 are tilted more greatly to support the support member 60 (the pin support portion 64). ) Can be reliably avoided. Therefore, the labor for paying attention so that the seatbacks 3, 4 and the support member 60 do not interfere with each other is reduced, and the workability when assembling the left seatback 3 to the vehicle body is improved.

  Here, for example, as a method of assembling the seat back, the position of the support member is provided further inside the vehicle (center side in the vehicle width direction) so that the support member of the seat back does not interfere with the support member of the floor portion. After the temporary insertion into the pin fixed to the seat, the seat back pin is placed on the support member inside the vehicle, and the seat back is moved to the outside of the vehicle, and the seat back bearing is fixed to the pin fixed to the inner wall of the vehicle body. It is also conceivable to insert a bush. However, when such a structure is employed, play is required in the vehicle width direction by the amount of movement in order to position the final assembly position. In the present invention, the play in the width direction of the seat corresponding to the movement amount is not required, and the positioning can be easily performed inside the vehicle, for example, by suppressing the variation in the position between the left and right seatbacks, It is also possible to improve the appearance and stabilize the forward tilt operation.

  Moreover, the receiving surface of the holding portion 12 a that holds the spherical body 22 (that is, the inner peripheral surface 32 a of the rising portion 32 of the bracket 20 and the inner peripheral surface 44 a of the rising portion 44 of the retainer 40) is formed on the outer peripheral surface of the spherical body 22. Since it is formed in a corresponding arc-shaped cross section, even if a load of an occupant or the like is applied, the load is easily dispersed, and the spherical body 22 is hardly deformed (set). Therefore, the spherical body 22 is deformed and a gap is formed between the receiving surface (the inner peripheral surfaces 32a and 44a) of the holding portion 12a, whereby rattling of the seatbacks 3 and 4 is effectively suppressed. You.

  A boss 26 is formed on the spherical body 22, and the boss 26 is engaged with the holding part 12 a (ie, the rising part 32 of the bracket 20 and the rising part 44 of the retainer 40), so that the spherical body 22 is formed. Rolling range is regulated. Therefore, while the range of the inclination angle of the mounting hole 24 is relatively large, the mounting hole 24 is reliably prevented from being unintentionally hidden by the holding portion 12a.

  Further, in the support structure of the vehicle seat 1, a pin 52 is provided on the inner side surface portion 13 of each of the seat backs 3 and 4, and the pin 52 is connected to a support member 60 (pin support plate 64a) fixed to the floor portion 7. ), The pin 52 has a peripheral groove 52a formed therein, and the pin 52 has a pin support plate 64a interposed in the peripheral groove 52a to restrict axial displacement. It is supported by the bearing 65 in this state. Therefore, the entirety of the seat backs 3 and 4 is located at a specific position in the vehicle width direction while the side surfaces 12 on the vehicle outside of the seat backs 3 and 4 are supported by the pins 6a inserted into the mounting holes 24. It can be positioned properly. That is, the seat backs 3, 4 are prevented from rattling in the vehicle width direction.

[Modifications, etc.]
The support structure of the vehicle seat 1 described above is an example of a preferred embodiment of the support structure of the vehicle seat according to the present invention, and the specific structure of the vehicle seat 1 and the specific structure of the vehicle seat 1 are described. The general support structure can be appropriately changed without departing from the gist of the present invention. For example, the following embodiment may be adopted.

  (1) In the embodiment, the holding part 12 a that holds the spherical body 22 so as to rollably includes the rising part 32 of the bracket 20 and the rising part 44 of the retainer 40, which constitute the side part 12 of the seat back frame 10. Have been. However, the configuration of the holding unit 12a is not limited to this. For example, the holding portion 12a may be a member provided separately from the bracket 20 so as to rollably hold the spherical body 22, and may be configured by a member assembled to the bracket 20 together with the spherical body 22. .

  (2) In the embodiment, the peripheral groove 52a is provided in the pin 52 that supports the side portion 13 (bracket 50) on the vehicle interior side of the seatbacks 3 and 4, and the pin supporting plate 64a is interposed in the peripheral groove 52a. This restricts the axial displacement of the pin 52 (positions the seatbacks 3, 4 in the vehicle width direction). That is, the side wall portions on both sides of the circumferential groove 52a correspond to the “engaging portions” of the present invention that regulate the axial displacement of the pin 52 (second shaft body). However, the structure for regulating the axial displacement of the pin 52 is not limited to this. For example, a portion (engaging portion) that protrudes radially outward such as a flange portion is provided on the pin 52, and a portion that sandwiches the protruding portion from both sides in the vehicle width direction is provided on the pin support portion 64 of the support member 60, so that May be restricted in the axial direction.

  (3) In the embodiment, the pin 52 provided on the side portion 13 (bracket 50) inside the vehicle of the seat back 3 is supported by the pin support portion 64 of the support member 60 fixed to the floor portion 7. , And the reverse structure may be adopted. That is, by disposing a supporting member having a pin extending in the vehicle width direction on the floor portion 7 side, and providing a supported portion having a cutout portion for receiving the pin on the side surface portion 13 of the seat back 3, The left seat back 3 may be tiltably (swingably) supported by the pins.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 3 Left seat back 4 Right seat back 6 Side wall 6a Pin (first shaft body)
12 Side part (first side part)
12a holding part 13 side part (second side part)
20 Bracket 40 Retainer 52 Pin (second shaft)
52a circumferential groove 60 support member 64 pin support portion 64a pin support plate (support portion)
65 Bearing

Claims (5)

A vehicle seat support structure having a retractable seat back,
A shaft fixed to the vehicle body and extending in the vehicle width direction;
A spherical body provided on a side surface of the seat back and having a mounting hole extending in a vehicle width direction, and a receiving surface having an arc-shaped cross section corresponding to an outer peripheral surface of the spherical body; And a holding unit for holding the rolling so that
The vehicle seat, wherein the seatback is supported by the shaft body inserted into the mounting hole so as to be swingable in the front-rear direction with respect to the vehicle body with the shaft body serving as a fulcrum. Support structure. It is a support structure of the vehicle seat of Claim 1, Comprising:
The spherical body includes a boss formed along an opening edge of the mounting hole,
The support structure for a vehicle seat, wherein the holding portion includes a regulating portion that regulates a rolling range of the spherical body by engaging with the boss portion. The vehicle seat support structure according to claim 1 or 2,
At the end of the mounting hole, the inner peripheral surface of the end on the inlet side of the shaft body is provided with a tapered portion whose inner diameter decreases from the outside to the inside of the mounting hole. Characteristic vehicle seat support structure. It is a support structure of the vehicle seat according to any one of claims 1 to 3,
When the side portion of the seatback is defined as a first side portion and the shaft body is defined as a first shaft body,
The seat back has a second shaft extending outwardly from the second side surface along a same axis as the first shaft body on a second side surface opposite to the first side surface in the vehicle width direction. Equipped with a body,
A support portion for rotatably supporting the second shaft body is provided on a floor portion of the vehicle body,
The second shaft portion is provided with an engagement portion that regulates displacement of the second shaft portion in the axial direction by engaging with the support portion. Support structure. It is a support structure of the vehicle seat of Claim 4, Comprising:
The first shaft body extends from the inner wall portion of the vehicle body toward the vehicle interior,
The support structure for a vehicle seat, wherein the support portion is provided at a center or a position near the center of a vehicle room in a vehicle width direction on the floor portion.