JP2007314061A - Seat structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat structure for a vehicle capable of preventing unlocking by an external force of a seat back in a prescribed backward tilting state. <P>SOLUTION: In this seat structure, a lock mechanism 40 has a vehicle body side gear 41 fixed to a vehicle body side and having external teeth on an outer periphery and a seat side gear 42 rotatably supported by vertical frame members 22a and 23 of a seat back frame 21 and having an external gear 42c on an outer periphery. The lock mechanism 40 is constituted to lock the seat back in the engaged state of the external teeth 41a and 41b of the vehicle body side gear 41 and the external tooth 42c of the seat side gear 42 on a surface substantially parallel to the vehicle body side surface. A portion where the seat side gear 42 in the vertical frame members 22a and 23 is supported is reinforced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seat structure having a lock mechanism that locks rotation of a seat back, and belongs to the technical field of a vehicle seat structure.

  A vehicle seat needs to prevent the seat posture from changing even when an external force due to an impact is applied to protect the occupant. For example, Patent Document 1 discloses that a seat cushion is provided on the side wall side of the cushion. In a side flip-up type seat that can be flipped up to the side wall of the vehicle body by a hinge provided at the portion, it is disclosed that the hinge is reinforced by a reinforcing member.

Japanese Utility Model Publication No. 5-26602

  By the way, although the said patent document 1 is targeting the side flip-up type | formula seat, while the seat back is supported so that rotation in the front-back direction is possible, it is for vehicles which can be locked by the lock mechanism in this predetermined back tilt state. A sheet exists.

  An example of such a vehicle seat will be described. As shown in FIG. 10, the seat back of the vehicle seat includes a vertical frame portion in which a frame extends along both left and right side portions of the seat back, and It has a horizontal frame part that connects the upper and lower parts of the left and right vertical frame parts, and the lower part of the vertical frame part is connected to the upper part of a bracket fixed to the floor (vehicle body) via a rotating shaft. Therefore, it is supported so that it can rotate in the front-rear direction around the rotation axis. Further, the lock mechanism is formed on the bracket and is rotatably supported by the vehicle body side gear having outer teeth formed on the outer periphery and the vertical frame portion of the seat back frame, and has a seat having outer teeth on the outer periphery. And the external gear of the vehicle body side gear and the external gear of the seat side gear are configured to lock in a state where they are engaged on a surface substantially parallel to the side end surface of the seat back. In this example, the lock mechanism is provided only on one vertical frame portion side.

  However, in such a configuration, the following problems may occur. That is, as shown in FIG. 11, for example, there is a luggage space behind the seat. For example, a load placed on the floor is moved forward by an external force due to an impact and is moved to one vertical frame. When the lower part of the seat back frame is fixed to the floor via the bracket, the one vertical frame part is deformed and pushed forward. At the same time, the one vertical frame portion side of the upper horizontal frame portion is deformed and moves forward. As a result, the upper side of the other vertical frame part (left side in FIG. 11) connected to the upper horizontal frame part falls inward, and as a result, the seat side gear is displaced inward in the vehicle width direction. The engagement with the vehicle body side gear may be disengaged, and as a result, the seat back may be unlocked.

  Therefore, an object of the present invention is to provide a vehicle seat structure capable of preventing unlocking due to an external force of a seat back in a predetermined backward tilt state when the lock mechanism is configured as described above.

  In order to solve the above-described problems, the present invention is configured as follows.

  First, the invention according to claim 1 of the present application is such that the seat back is supported so as to be pivotable in the front-rear direction, and can be locked in a predetermined backward tilt state by a lock mechanism, and the frame of the seat back Is a vehicle seat structure having a vertical frame portion extending along both left and right side portions of the seat back, wherein the lock mechanism is fixed to the vehicle body side, and the vehicle body side gear having outer teeth formed on the outer periphery thereof; It has a seat side gear that is rotatably supported by the vertical frame portion of the seat back frame and has external teeth on the outer periphery, and the external teeth of the vehicle body side gear and the external teeth of the seat side gear are substantially parallel to the side surface of the vehicle body. It is configured to lock in a state of meshing on the surface, and a portion of the vertical frame portion of the seat back frame where the seat side gear is supported is reinforced.

  According to a second aspect of the present invention, in the vehicle seat structure according to the first aspect, the lock mechanism is provided outside a vertical frame portion of a seat back frame.

  According to a third aspect of the present invention, in the vehicle seat structure according to the first or second aspect, the vehicle body side gear is provided on a rotating shaft of a seat back. .

  Furthermore, the invention according to claim 4 is the vehicle seat structure according to claim 3, wherein the seat side gear is provided above the vehicle body side gear in the vertical frame portion of the seat back frame. It is characterized by.

  According to a fifth aspect of the present invention, in the vehicle seat structure according to the third aspect, the vertical frame portion of the seat back frame has a surface portion substantially parallel to the side surface of the vehicle body, and the seat side The rotation shaft of the gear is provided at a position where displacement due to an external force in the substantially parallel surface portion is small.

  According to a sixth aspect of the present invention, the seat back is supported so as to be pivotable in the front-rear direction, and can be locked in a predetermined backward tilted state by a lock mechanism, and the frame of the seat back is A vehicle seat structure having a vertical frame portion extending along both left and right side portions of a seat back, wherein the lock mechanism is fixed to a vehicle body side and has outer teeth formed on an outer periphery thereof, and the seat back A seat-side gear that is rotatably supported by the vertical frame portion of the frame and has outer teeth on the outer periphery, and the outer teeth of the vehicle body-side gear and the outer teeth of the seat-side gear are substantially parallel to the side surface of the vehicle body. The vertical frame portion of the seat back frame has a surface portion substantially parallel to the side surface of the vehicle body, and the seat side gear and the vehicle body side gear are Place In rearwardly inclined state of, and being provided at substantially the same height position in the substantially parallel surface portions.

  Next, the effect of the present invention will be described.

  According to the first aspect of the present invention, the lock mechanism is rotatably supported by the vehicle body side gear that is fixed to the vehicle body side and has external teeth formed on the outer periphery thereof, and the vertical frame portion of the seat back frame. A seat side gear having external teeth on the outer periphery, and configured to lock in a state in which the external teeth of the vehicle body side gear and the external teeth of the seat side gear mesh with each other on a surface substantially parallel to the side surface of the vehicle body. Even in such a case, since the vertical frame portion of the seat back frame is reinforced at the portion where the seat side gear is supported, even if an external force acts on the seat back in a predetermined backward tilt state, The portion of the portion where the seat side gear is supported is less likely to be deformed, and the engagement between the vehicle body side gear and the seat side gear is difficult to disengage. For example, even when an external force from the rear as described in the problem to be solved by the above-described invention is applied, the vertical frame portion is difficult to fall inward, that is, the seat side gear is in the vehicle width direction with respect to the vehicle body side gear. And the meshing between the vehicle body side gear and the seat side gear is difficult to disengage.

  By the way, if the lock mechanism is provided on the inner side of the vertical frame portion, the size of the vehicle body side gear or the like cannot be sufficiently increased due to the relationship with other members (for example, pad material) arranged on the inner side, and rigidity is increased. Hard to secure.

  However, according to the second aspect of the present invention, since the lock mechanism is provided outside the vertical frame portion of the seat back frame, the outer diameter of the vehicle body side gear is increased and the rigidity is easily improved. .

  Further, according to the invention of claim 3, since the vehicle body side gear is provided on the rotation shaft of the seat back, the vehicle body side gear is supported by the rotation shaft of the vertical frame portion of the seat back. However, it is difficult for the vehicle body side gear and the seat side gear to disengage from each other.

  Here, when the vehicle body side gear is provided on the rotation axis of the seat back in this way, the rotation axis is provided at the lower portion of the vertical frame portion. In this case, the seat side gear is set to the vertical frame portion. When it is provided in front of or behind the pivot shaft, the longitudinal width of the vertical frame portion increases, and the lower portion of the seat back increases in size in the front-rear direction.

  However, according to the invention described in claim 4, since the seat side gear is provided above the vehicle body side gear, the longitudinal width of the vertical frame portion is not increased, and the size can be reduced.

  By the way, in order to make it easy to attach the seat side gear to the vertical frame portion of the seat back frame, it is conceivable to provide a surface portion substantially parallel to the side surface of the vehicle body on the vertical frame portion and to provide the seat side gear on the surface portion. However, when the vertical frame portion described in the problem to be solved by the invention falls, the seat back is inclined backward, so that the substantially parallel surface portion of the vertical frame portion is displaced more inward as the rear side. Therefore, it is necessary to consider this.

  Therefore, in the invention according to claim 5, the rotation shaft of the seat side gear is provided at a position where the displacement due to the deformation by the external force in the substantially parallel surface portion is small. Engagement with the side gear is difficult. When an external force from the rear as described in the problem to be solved by the invention is applied, the position where the displacement due to the external force is small is the front portion of the surface portion.

  According to the invention of claim 6, the vertical frame portion of the seat back frame has a surface portion substantially parallel to the side surface of the vehicle body, and the seat side gear and the vehicle body side gear In the rearward tilt state, the substantially parallel surface portions are provided at substantially the same height position, so that they are less affected by the difference in the amount of inward tilt of the vertical frame member in the height direction, and the vehicle body side gear and the seat side gear It becomes difficult to disengage.

  Embodiments of the present invention will be described below.

  As shown in FIG. 1, left and right rear seats 3 and 4 are provided on a rear floor 2 of a vehicle 1 according to the present embodiment. The rear side of the rear seats 3 and 4 on the floor 2 is a luggage space 2a in which the luggage L can be placed.

  As shown in FIG. 2, the left rear seat 3 includes a seat cushion 10, a seat back 20, and a support mechanism 30 that supports these on the vehicle body. The right rear seat 4 is symmetrical with the rear seat 3 and will not be described.

  As shown in FIGS. 2 and 3, a seat back frame 21 constituting a skeleton of the seat back 20 is disposed inside the seat back 20. The seat back frame 21 is formed of a round pipe member and extends substantially vertically along the side end portion of the seat back 20, and left and right vertical frame portions 22a and 22b, and upper end portions of both the vertical frame portions 22a and 22b. A frame-like frame member 22 having a rectangular shape in rear view having horizontal frame portions 22c, 22d that connect each other, and a U-shaped frame member fixed to the vertical frame portions 22a, 22b of the frame-like frame member 22 from the outside. 23, 23. As shown in FIG. 6, the U-shaped frame member 23 has a side end surface 20a of the seat back 20 (the side end surface 20a is substantially parallel to the side surface of the vehicle body. A surface portion 23a substantially parallel to the surface portion 23a, 24a, and bent portions 23b, 23c, which are provided to be bent inwardly at the front and rear edges of the surface portions 23a, 24a and reinforce the surface portions 23a, 24a, 24b, 24c. The vertical frame portion of the seat back frame in the claims includes a combination of the vertical frame portion 22a and the U-shaped member 23 in the present embodiment, or the vertical frame portion 22b and the U-shaped member 23. Corresponds to the combination.

  As shown in FIGS. 2 and 3, the rear of the seat back frame 21, the rear of the frame-shaped frame member 22 and the U-shaped frame members 23, 23 have substantially the same shape as the back of the seat back 3 in a rear view. A back plate 24 is attached via brackets 25. The back plate 24 prevents a large impact from being applied to a seated occupant when a load loaded behind the seat 3 moves forward due to an external force due to the impact and comes into contact with the seat back 20. It is provided for the purpose of making it, and is composed of an iron plate. The plate 24 may be a resin plate or the like.

  As shown in FIGS. 2 and 3, the support mechanism 30 includes front brackets 31 and 31 (only the left one is shown in the drawings) fixed to the floor 2 below the front portions of the left and right side portions of the seat cushion 10. The lower brackets 33, 33 fixed to the floor 2 below the rear part of the same side, and the lower part is fixed to the vertical surface part of the lower brackets 33, 33, and the U-shape of the seat back frame 21 is set to the upper part. The lower parts of the member 23, 23 have upper brackets 35, 35 connected via support pins 34, 34, and the seat back 20 can be rotated back and forth around the support pins 34, 34. I support it.

  A seat cushion frame 11 constituting a skeleton of the seat cushion 10 is disposed inside the seat cushion 10. The seat cushion frame 11 includes a front and rear frame member 12 (only the left side is shown in FIG. 2) that extends front and rear in the left and right sides of the seat cushion 10, and front and rear portions of the left and right front and rear frame members 12. A horizontal frame member (not shown) to be connected.

  The front end portion of the left and right front and rear frame members 12 is connected to the front portion of the front bracket 31 via a link 36 constituting the support mechanism 30. Further, a front end portion of an L-shaped connecting member 37 constituting the support mechanism 30 is fixed to the rear portion of the front and rear frame member 12, and an upper end portion of the connecting member 37 is connected via a connecting pin 38. The lower part of the U-shaped member 23 of the seat back frame 21 is connected. The right side has the same configuration.

  According to the seat 3 having such a configuration, when the seat back 20 is rotated forward, the seat cushion 10 moves downward while moving forward via the connecting member 37. As shown in FIG. 4, a state in which the seat back 20 is moved forward substantially horizontally is realized.

  Next, the lock mechanism 40 that locks the seat back 20 in the predetermined backward tilt state shown in FIG. 2 and the forward tilt state shown in FIG. 4 will be described.

  The lock mechanism 40 is provided only on the left U-shaped member 23 side of the seat back frame 21, and as shown in FIG. 5, the lock mechanism 40 is integrally formed on the upper part of the upper bracket 35 of the support mechanism 30. A gear 41; a seat side gear 42 rotatably supported on the U-shaped member 23 of the seat back frame 21 above the vehicle body side gear 41; and a lock member 43 that locks the seat side gear 42. is doing. The gears 41 and 42 and the lock member 43 are disposed along the outer surface of the surface portion 23a (surface portion substantially parallel to the side surface of the vehicle body) substantially parallel to the side end surface 20a of the seat back 20 in the U-shaped frame member 23. , Meshing on a plane parallel to the plane.

  The vehicle body side gear 41 is formed of an iron plate having a thickness of about 10 mm, is provided on the support pin 34 of the seat back 20, and is formed in an arcuate outer peripheral portion centering on the support shaft pin 34 in the upper bracket 35. And two sets of external teeth 41a and 41b each having two recesses. As shown in FIGS. 6 and 7, large-diameter portions 34 a and 34 b are provided at both ends of the support pin 34, and the vehicle-body side gear 41 and the surface portion 23 a of the U-shaped member 23 are formed by the large-diameter portions 34 a and 34 b. Are slidable so that these members 41 and 23a are not separated from each other.

  The seat side gear 42 is formed of an iron plate having a thickness similar to that of the vehicle body side gear 41, a base portion 42a through which the support pin 44 is inserted, a main body portion 42b extending from the base portion 42a to the back side of the seat back 20, An external tooth 42c, which is formed of two convex portions that extend in the direction of the vehicle body side gear 41 from the main body portion 42b and can be engaged with the concave portions of the external teeth 41a and 41b of the vehicle body side gear 41, and a lock member 43 from the tip of the main body portion 42b. And a convex portion 42d protruding to the side. Large diameter portions 44a and 44b are provided at both ends of the support pin 44, and the large diameter portions 44a and 44b sandwich the seat side gear 42 and the surface portion 23a of the U-shaped member 23 so that they can slide. These members 42 and 23a are not separated from each other. The support pin 44 is provided at a position close to the front side of the seat back 20 in the surface portion 23 a of the U-shaped member 23. This position is a position where the displacement due to the torsion due to the external force is small in the surface portion 23a of the U-shaped member 23 when an external force is applied to the seat back 20 from the rear. The seat side gear 42 is urged in a counterclockwise direction indicated by reference numeral a by an urging means (not shown).

  The lock member 43 is formed of an iron plate having the same thickness as the vehicle body side gear 41, and includes a base portion 43a through which the support pin 45 is inserted, and a main body portion 43b extending from the base portion 43a in the seat side gear 42 direction. Yes. Large diameter portions 45a and 45b are provided at both ends of the support pin 45, and the lock member 43 and the surface portion 23a of the U-shaped member 23 are slidable by the large diameter portions 45a and 45b. These members 43 and 23a are not separated. Further, the lock member 43 is urged in the counterclockwise direction indicated by the symbol a by urging means (not shown). The urging force is set larger than the urging force that urges the seat side gear in the direction indicated by the reference symbol (a).

  In order to facilitate the forward operation of the seat back 20, a lock release string (not shown) for rotating the lock member 43 in the clockwise direction (counter arrow A direction) is provided on the distal end side of the main body 43b. One end is connected, and the other end of the release string is connected to a lock release lever (not shown) provided on the upper side of the seat back 20.

  In a predetermined rearward tilt state, the outer teeth 41a on the rear side of the vehicle body side gear 41 and the outer teeth 42c of the seat side gear 42 mesh with each other, and the main body of the lock member 43 urged by the urging means. The front end of 43b is pressed against the protrusion 42d of the seat side gear 42, whereby the seat back 20 is locked in a predetermined rearward tilt state.

  On the other hand, when the lock release lever is operated and the lock member 43 is rotated in the clockwise direction (counter arrow A direction), the seat side gear 42 is rotated in the counterclockwise direction (arrow A direction) by the urging means. The engagement of the external teeth 41a on the rear side of the vehicle body side gear 41 and the external teeth 42b of the seat side gear 42 is released. That is, the lock of the seat back 20 in a predetermined backward tilt state is released.

  In this state, when the seat back 20 is pushed forward of the vehicle, the seat back 20 rotates forward about the support pin 34. When the seat back 20 is tilted forward to a position where the front external teeth 41b of the vehicle body side gear 41 and the external teeth 42c of the seat side gear 42 can engage with each other, the lock member 43 is rotated counterclockwise by the urging means. The lock member 43 rotates in the clockwise direction (counter arrow A direction), and the tip of the main body 43a of the lock member 43 protrudes from the seat side gear 42. The outer teeth 41b on the front side of the vehicle body side gear 41 and the outer teeth 42c of the seat side gear 42 mesh with each other while being pressed against the portion 42d. That is, the seat back 20 is locked in a predetermined forward state.

  On the other hand, if the lock release lever is operated in this state, although the detailed description is omitted, the seat back 20 is unlocked in a predetermined forward-turned state. Then, it can be rotated to a predetermined backward tilted state and locked in that state.

  Here, in the seat 3 according to the present embodiment, as shown in FIGS. 6, 7, and 8, the vehicle body side gear 41, the seat side, in the surface portion 23 a of the U-shaped member 23 of the seat back frame 21. A reinforcing plate 50 is provided on the back surface of the portion where the gear 42 and the lock member 43 are disposed. The reinforcing plate 50 is for reinforcing the portion so that the seat side gear 42 is not easily displaced in the vehicle width direction with respect to the vehicle body side gear 41 by an external force. When viewed from the side, the shape is such that it substantially overlaps the vehicle body side gear 41, the seat side gear 42, and the lock member 43, and the holes 50 a, 50 b, 50 c are located at positions corresponding to the support shaft pins 34 and the support pins 44, 45. And is welded to the surface portion 23 a of the U-shaped member 23.

Next, the effect of the vehicle seat structure according to the present embodiment will be described.
First, the lock mechanism 40 is fixed to the floor 2 (vehicle body side), the vehicle body side gear 41 having outer teeth 41a and 41b formed on the outer periphery, and the vertical frame portions 22a and 23 of the seat back frame 21 (as described above). The vertical frame portion of the seat back frame of the claims corresponds to a combination of the vertical frame portion 22a of the frame-shaped frame member 22 and the U-shaped member 23), and is rotatably supported on the outer periphery. A seat side gear 42 having external teeth 42c, and the external teeth 41a, 41b of the vehicle body side gear 41 and the external teeth 42c of the seat side gear are locked in a state where they are meshed on a plane substantially parallel to the side surface of the vehicle body. Even in such a configuration, the vertical frame portions 22a and 23 of the seat back frame 21 are reinforced at portions where the seat side gear 42 is supported, so Even when an external force is applied to the seat back 20 (shown in FIG. 2), the portions of the vertical frame portions 22a and 23 where the seat side gear 42 is supported are not easily deformed, and the vehicle body side gear 41 and the seat side gear are not deformed. 42 becomes difficult to come off. For example, even when an external force from the rear acts on the right side portion of the left seat back 20 as shown in FIG. 11, the portions of the vertical frame portions 22a and 23 where the seat side gear 42 is supported are less likely to fall down. That is, the seat side gear 42 is less likely to be displaced in the vehicle width direction with respect to the vehicle body side gear 41, and the engagement between the vehicle body side gear 41 and the seat side gear 42 is less likely to be disengaged.

  In addition, since the lock mechanism 40 is provided outside the vertical frame portions 22a and 23 of the seat back frame 21, the outer diameter of the vehicle body side gear 42 can be increased to increase the rigidity.

  Further, since the vehicle body side gear 41 is provided on the rotation shaft 34 of the seat back 20, the vehicle body side gear 41 is a surface portion 23 a constituting the vertical frame portion of the seat back 20 supported by the support shaft pin 34. However, the vehicle body side gear 41 and the seat side gear 42 are not easily disengaged from each other.

  Further, since the seat side gear 42 is provided above the vehicle body side gear 41, the longitudinal width of the vertical frame portions 22a, 23 is not increased, and the size can be reduced.

  By the way, when the vertical frame portions 22a and 23 are provided with the surface portion 23a substantially parallel to the side surface of the vehicle body and the seat side gear 42 is provided on the surface portion 23a, the vertical frame described with reference to FIG. When the part falls down, the seat back 20 tilts backward, so that the substantially parallel surface part 23a of the vertical frame parts 22a and 23 is displaced more inward toward the rear side. Since the rotation shaft 44 of the seat side gear 42 is provided at a position where the displacement due to the external force in the surface portion 23a of the U-shaped member 23 is small, the vehicle body side gear 41 and the seat side gear 42 are disengaged. It becomes difficult.

  In the present embodiment, the portion of the U-shaped frame member 23 of the seat back frame 21 is reinforced by joining the reinforcing plate 50 to the portion where the vehicle body side gear 41 and the seat side gear 42 are provided. However, it may be reinforced by increasing the thickness of the part, forming a rib at the part, or forming a U-shaped frame with a highly rigid member.

  Moreover, you may comprise like other embodiment shown in FIG. That is, in this embodiment, the lock mechanism 60 is integrally formed on the upper bracket 35 'fixed to the vehicle body side as in the above embodiment, and the outer body 61a, 61b is formed on the outer periphery. A side gear 61, a seat-side gear 62 having an outer tooth 62a on the outer periphery thereof, rotatably supported by a surface portion 23a 'substantially parallel to the vehicle body side surface of the U-shaped member 23' of the seat back frame; The outer teeth 61a and 61b of the vehicle body side gear 61 and the outer teeth 62a of the seat side gear 62 are engaged with each other, and the reinforcing plate as in the above embodiment is provided. The support pin 64 of the seat side gear 62 and the support shaft pin 34 ′ of the vehicle body side gear 61 are provided so as to have substantially the same height when the seat back is tilted backward. There. According to this embodiment, since the support pin 64 of the seat side gear 62 and the support shaft pin 34 'of the vehicle body side gear 61 are substantially at the same height position, the inner side in the height direction of the vertical frame portion 23'. It becomes difficult to be affected by the difference in the amount of leaning, and the engagement between the vehicle body side gear 61 and the seat side gear 62 becomes difficult to come off. Note that if the support portion of the seat side gear 62 on the parallel surface portion 23a ′ is reinforced inwardly, the rigidity of the portion increases, and the vehicle body side gear 61 and the seat side gear 62 due to inward tilting, etc. Further, disengagement is less likely to occur, the thickness of the seat side gear 62 can be reduced, and the length of the rear seat 3 in the vehicle width direction can be reduced.

  In each of the above embodiments, the present invention is applied only to the vertical frame portion on the side closer to the vehicle body side of the left and right vertical frame portions, but when the lock mechanism is provided on both the left and right vertical frame portions, Applicable to both vertical frame portions.

  In the present invention, the lock mechanism is rotatably supported by the vertical frame portion of the seat back frame and has a seat side gear having external teeth on the outer periphery, and the external teeth of the vehicle body side gear and the external teeth of the seat side gear And the vertical frame portion of the seat back frame is reinforced at the portion where the seat side gear is supported. Therefore, even when an external force is applied to the seatback in a predetermined backward tilted state, a portion where the seat side gear is supported in the vertical frame portion is not easily deformed, and therefore the meshing between the vehicle body side gear and the seat side gear is performed. Is difficult to release and prevents the lock mechanism from being unlocked, and can be widely applied to vehicle seat structures having such a lock mechanism.

1 is a schematic plan view of a rear part of a vehicle compartment according to an embodiment of the present invention. It is a left view of a left rear seat (predetermined rearward tilt state). It is a rear view of a left rear seat. FIG. 6 is a left side view of the left rear seat (forward-turned state). FIG. 3 is an enlarged view of a lock mechanism portion of FIG. 2 (a connecting member 37 that is not related to the lock mechanism is omitted as appropriate); It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is C arrow line view of FIG. FIG. 6 is a view corresponding to FIG. 5 according to another embodiment. It is explanatory drawing of the subject which it is going to solve (the 1). It is explanatory drawing of the subject which it is going to solve (the 2).

Explanation of symbols

1 Vehicle 3, 4 Rear seat (seat)
DESCRIPTION OF SYMBOLS 10 Seat cushion 20 Seat back 21 Seat back frame 22a The vertical frame part of a frame-shaped frame member (the vertical frame part of a seat back frame)
23 U-shaped member (vertical frame part of seat back frame)
23a Surface part (surface part substantially parallel to the vehicle body side surface in the vertical frame part)
30 Support mechanism 34, 34 'Support pin (rotating shaft)
40, 60 Lock mechanism 41, 61 Car body side gear 41a, 61a External teeth 42, 62 Seat side gear 42a, 42b, 62a, 62b External teeth 44, 64 Support pin 50 Reinforcing member

Claims (6)

The seat back is supported so as to be pivotable in the front-rear direction, and can be locked in a predetermined rearward tilted state by a lock mechanism, and the frame of the seat back extends vertically along both the left and right sides of the seat back. A vehicle seat structure having a frame part,
The locking mechanism includes a vehicle body side gear fixed to the vehicle body and having outer teeth formed on the outer periphery thereof, and a seat side gear rotatably supported on the vertical frame portion of the seat back frame and having outer teeth on the outer periphery thereof. The outer teeth of the vehicle body side gear and the outer teeth of the seat side gear are configured to lock in a state where they are engaged on a surface substantially parallel to the side surface of the vehicle body,
A vehicle seat structure characterized in that a portion of the vertical frame portion of the seat back frame where a seat side gear is supported is reinforced. In the vehicle seat structure according to claim 1,
The vehicle seat structure according to claim 1, wherein the lock mechanism is provided outside a vertical frame portion of a seat back frame. In the vehicle seat structure according to claim 1 or 2,
The vehicle seat structure is characterized in that the vehicle body side gear is provided on a pivot shaft of a seat back. In the vehicle seat structure according to claim 3,
The vehicle seat structure, wherein the seat side gear is provided above a vehicle body side gear in a vertical frame portion of the seat back frame. In the vehicle seat structure according to claim 3,
The vertical frame portion of the seat back frame has a surface portion substantially parallel to the side surface of the vehicle body,
The vehicle seat structure according to claim 1, wherein the rotation shaft of the seat side gear is provided at a position where the displacement by the external force in the substantially parallel surface portion is small. The seat back is supported so as to be pivotable in the front-rear direction, and can be locked in a predetermined rearward tilted state by a lock mechanism, and the frame of the seat back extends vertically along both the left and right sides of the seat back. A vehicle seat structure having a frame part,
The locking mechanism includes a vehicle body side gear fixed to the vehicle body and having outer teeth formed on the outer periphery thereof, and a seat side gear rotatably supported on the vertical frame portion of the seat back frame and having outer teeth on the outer periphery thereof. And the outer teeth of the vehicle body side gear and the outer teeth of the seat side gear are configured to be locked in a state of being engaged on a surface substantially parallel to the side surface of the vehicle body,
The vertical frame portion of the seat back frame has a surface portion substantially parallel to the side surface of the vehicle body,
The vehicle seat structure, wherein the seat side gear and the vehicle body side gear are provided at substantially the same height in the substantially parallel surface portion in the predetermined rearward tilt state.

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