JP5493898B2 - Vehicle seat mounting structure - Google Patents

Description

  The present invention relates to a vehicle seat mounting structure having a foldable rear seat device, and more particularly to a vehicle seat mounting structure provided with a seat mounting portion for mounting a part of a rear seat device on a cross member behind a seat back.

  Conventionally, a seat device composed of a seat back and a seat cushion is subjected to a load accompanying acceleration / deceleration during traveling of the vehicle in addition to the weight of a seated occupant. A plurality of cross members extending in the width direction and forming a closed cross section are provided, and a seat mounting structure in which a seat device is attached to these cross members is employed.

  In Patent Document 1, a reinforcing member (cross member) extending in the vehicle width direction is formed at the front side position of the luggage floor panel (rear floor panel) in cooperation with the luggage floor panel and extending in the vehicle width direction. A seat mounting structure is disclosed in which a bracket that pivotally supports a mounting piece of a retractable rear seat back is mounted.

  In this seat mounting structure, the upper surface portion of the reinforcing member is formed in an inclined shape so as to gradually increase upward from the rear end thereof, and a mounting portion that is recessed into the upper surface portion of the reinforcing member and the corner portion of the front surface portion is formed. ing. With this configuration, the rear seat back mounting piece is firmly supported on the mounting part via the bracket, and when the rear seat back falls, the level difference between the luggage floor panel and the back of the seat back is reduced, improving the luggage storage performance. ing.

Body strength members such as cross members are set in terms of strength, rigidity, and location based on the vehicle design and required safety performance, and the layout of the seat device depends on the use of the vehicle, such as the size of the luggage compartment and the number of seats. It is set according to the vehicle model concept.
Moreover, in order to reduce development costs and shorten the development period, there is an increasing tendency to use a common underbody for the vehicle body and to develop a plurality of models using the underbody.

JP-A-8-40310

  When the arrangement position of the cross member is set in consideration of the layout of the sheet device, the sheet device can be firmly supported by the cross member. However, when developing multiple vehicle models using a common underbody, or when the layout of the seat device is restricted due to design, the seat device is greatly separated from the cross member in the front, and the seat device is attached to the cross member. There is a possibility that it cannot be done.

  In the seat mounting structure of Patent Document 1, when the seat device is in use (the seat back is standing up), the seat back is positioned directly above the reinforcing member, so the load input to the seat device is reinforced via the bracket. Can be supported by members. However, when the seat device is separated from the reinforcing member by a predetermined distance from the design requirements, the bracket needs to be enlarged and extended forward. Large brackets increase material costs and production costs, and cantilevered large brackets may not ensure sufficient mounting rigidity of the seat device.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seat mounting structure for a foldable rear seat device, which is a vehicle seat mounting structure capable of ensuring both freedom of layout of the rear seat device and securing of rigidity of the rear seat.

The vehicle seat mounting structure according to claim 1 includes a floor panel forming a floor surface of a passenger compartment, and a foldable rear seat device including a seat back and a seat cushion, and the rear seat device is mounted on the floor panel. The seat mounting structure includes a cross member that extends in the vehicle width direction with a predetermined distance from the lower end of the seat back to the rear in the vehicle front-rear direction, and includes a bulge that bulges forward in the vehicle front-rear direction. A seat attachment portion is formed, and a part of the rear seat device is attached to the seat attachment portion. The cross member includes an upper cross member member at least a part of which is joined to the upper surface of the floor panel, and the seat attachment portion. The portion is formed in the upper cross member member .

  In this seat mounting structure, since the seat mounting portion including the bulging portion that bulges forward in the vehicle front-rear direction is formed on the cross member, the cross member is separated from the lower end portion of the seat back of the rear seat device by a predetermined distance rearward in the vehicle front-rear direction. Even in this case, the distance between the lower end portion of the seat back of the rear seat device and the seat mounting portion can be shortened.

Invention 請 Motomeko 2 is the invention of claim 1, the support bracket for rotatably supporting one end portion in the vehicle width direction of the seat back of the rear seat apparatus is characterized in that provided in the sheet attachment portions .

According to a third aspect of the present invention, in the first or second aspect of the invention, the upper surface of the seat mounting portion is formed lower than the upper surface of the main body portion of the cross member via a stepped portion, and the center of rotation of the seat back is the The support bracket is attached so as to be positioned below the upper surface of the main body portion of the cross member.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the rear seat device includes a seat belt device that holds a posture of an occupant, and the retractor of the seat belt device is provided with respect to the bulging portion. It is arranged at a position adjacent to the vehicle width direction.
According to a fifth aspect of the present invention, in the invention of the fourth aspect , the retractor is attached to the rear seat device so as to be positioned adjacent to the bulging portion in the vehicle width direction when the rear seat device is in use. It is characterized by.

The invention of claim 6 is characterized in that, in the invention of claim 4 , the retractor is fixed to the cross member and the bulging portion via a retractor support bracket for supporting the retractor.
The invention of claim 7 is the invention according to any one of claims 1 to 6 , wherein the rear seat device includes a seat belt device buckle for maintaining the posture of an occupant, and the buckle is attached to the bulging portion. It is a feature.

The invention of claim 8 is the invention according to any one of claims 1 to 7 , wherein the floor panel includes a front floor panel that forms a lower surface of a passenger compartment, and a kick-up extending upward from a rear end of the front floor panel. A rear floor panel that is formed continuously with the front floor panel through the section and positioned above the front floor panel, and the cross member is provided in the kick-up section.

According to the first aspect of the present invention, the cross member is provided with the cross member extending in the vehicle width direction with a predetermined distance from the lower end of the seat back to the rear in the vehicle front-rear direction, and the bulging portion that bulges forward in the vehicle front-rear direction. Since the seat mounting portion is formed and a part of the rear seat device is attached to the seat mounting portion, the distance between the seat back lower end portion of the rear seat device and the seat mounting portion can be shortened, and the lower end portion of the seat back and the cross member The rear seat device can be attached to the cross member even when the distance in the vehicle front-rear direction is large. In addition, since the seat mounting portion is formed on the upper cross member member joined to the upper surface of the floor panel, the vertical distance between the seat device and the upper cross member member can be shortened, and the support rigidity of the seat device can be increased.
Therefore, the seat device can be laid out regardless of the position of the cross member, which is the vehicle body strength member, and the layout flexibility of the seat device can be increased while ensuring the support rigidity of the seat device.

According to the invention 請 Motomeko 2, support the support bracket for rotatably supporting one end portion in the vehicle width direction of the seat back of the rear seat apparatus for providing the seat attachment portion, the seat attachment portion to the rotational center of the seat back The overall length of the bracket in the vehicle front-rear direction can be suppressed, and the support rigidity of the seat back can be increased.

According to the invention of claim 3 , since the support bracket is attached so that the center of rotation of the seat back is located below the upper surface of the main body portion of the cross member, the center of rotation of the seat back can be arranged low, Sometimes, the cargo floor and the back of the seat back can be flattened.

According to the invention of claim 4 , since the retractor of the seat belt device is disposed at a position adjacent to the bulging portion in the vehicle width direction, it is between the lower end portion of the seat back and the main body portion of the cross member. A retractor can be arrange | positioned in the formed dead space, and space efficiency can be improved.
According to the invention of claim 5 , the mounting step of mounting the retractor on the vehicle body side can be omitted, and the components and the like can be made compact by integrating the retractor and the rear seat device. Moreover, when the rear seat device is in use, the same effect as in the fifth aspect can be obtained.

According to the invention of claim 6 , since the retractor is attached to the cross member and the bulging portion which are the vehicle body strength members, the space efficiency is enhanced as in the case of claim 5, and the reinforcement for securing the support rigidity of the retractor is performed. Therefore, it is possible to increase the support rigidity of the retractor, and to suppress an increase in the weight of the vehicle body.
According to the invention of claim 7 , the support rigidity of the buckle for the seat belt device can be increased without increasing the weight of the vehicle body.

According to the invention of claim 8 , since the cross member is provided using the kick-up portion, the rear seat device can be attached to the cross member without reducing the length of the rear floor panel in the vehicle front-rear direction. It can be secured. In addition, the vertical distance between the seat device and the cross member can be shortened, and the support rigidity of the seat device can be increased.

1 is a longitudinal sectional view of a rear seat device and a rear vehicle body related to Example 1 of the present invention. It is a top view of a rear body. It is a perspective view of the principal part containing a sheet | seat attachment part. It is a longitudinal cross-sectional view of the principal part containing a sheet | seat attachment part. It is a top view of the principal part containing a sheet | seat attachment part. It is a perspective view of a rear seat device. It is a side view of a rear seat device (use condition) and a fall mechanism. It is a side view of a rear seat device (in the middle of overturning) and a overturning mechanism. It is a side view of a rear seat device (a fall state) and a fall mechanism. It is a longitudinal cross-sectional view of a rear seat device (in a lying state) and a rear vehicle body. FIG. 3 is a diagram corresponding to FIG. 1 according to a second embodiment. FIG. 3 is a diagram corresponding to FIG. 3 according to the second embodiment. FIG. 6 is a diagram corresponding to FIG. 4 according to the second embodiment. FIG. 10 is a diagram corresponding to FIG. 10 according to the second embodiment. FIG. 7 is a diagram corresponding to FIG. 6 according to the third embodiment. FIG. 6 is a view corresponding to FIG. 1 according to a third embodiment. FIG. 10 is a diagram corresponding to FIG. 10 according to the third embodiment. It is a side view of the principal part containing a rear seat device (use condition) and a retractor. It is a side view of the principal part including a rear seat device (in a lying state) and a retractor.

Hereinafter, modes for carrying out the present invention will be described based on examples.
In the following embodiments, the front-rear direction of the vehicle will be referred to as the front-rear direction, and the left-right direction of the vehicle will be described as the left-right direction.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 2 is a plan view of the rear vehicle body with the rear seat device 30 removed.
The vehicle 1 includes a vehicle interior space 2 that includes a front seat device (not shown), a rear seat device 30, and the like, a front and rear side doors (not shown), and a portion of the vehicle compartment located behind the rear seat device 30. This is a passenger car having a cargo space 3 and a back door 5 that can open and close the rear opening 4.

  The vehicle body of the vehicle 1 includes a floor panel forming a floor surface of a passenger compartment, a pair of left and right front side frames (not shown), and a pair of left and right rear side frames 7 connected to a rear end portion of each front side frame. No. 1 stretched across a pair of rear side frames. 3 cross member 8, No. 3 is stretched across the pair of rear side frames 7 behind the cross member 8. 4 A cross member 9 and a pair of cab side panel members 10 constituting left and right side walls of the compartment space 2 and the cargo space 3 are provided. The floor panel includes a front floor panel 11 that forms a floor surface of a portion other than the luggage space 3 in the passenger compartment, a kick-up panel 19 that extends upward and rearward from the rear end of the front floor panel 11, and a spare. And a rear floor panel 12 that includes a tire pan 13 and forms a floor surface of the cargo space 3.

  The front floor panel 11, the kick-up panel 19, and the rear floor panel 12 are joined in a state where a pair of rear side frames 7 are bridged, and the No. 4 cross member 9 is joined to the kick-up panel. The upper surface of the rear side frame 7 is located above the rear floor panel 12.

  No. The three cross member 8 is provided in the rear part of the vehicle interior space 2 and on the upper surface of the front floor panel 11, is formed in a substantially hat-like cross section extending in the vehicle width direction, and has a closed cross section in cooperation with the front floor panel 11. . No. The three cross member 8 supports a front end portion of the seat cushion 32 of the rear seat device 30 in the vehicle front-rear direction.

  No. The four cross members 9 are arranged so as to extend in the vehicle width direction at positions spaced apart from the lower end portion of the rear seat device 30 by a predetermined distance rearward in the vehicle front-rear direction, and support the rear end portion of the rear seat device 30 in the vehicle front-rear direction. No. The four cross member 9 includes an upper cross member member 21 having a substantially hat-shaped cross section and a lower cross member member 22 having a substantially reverse hat-shaped cross section.

  The upper cross member member 21 is joined to the upper surface of the kick-up panel 19 to form an upper closed cross section in cooperation with the kick-up panel 19, and the lower cross member member 22 is joined to the lower surface of the kick-up panel 19. The kick-up panel 19 has a lower closed cross section. That is, no. The four cross members 9 constitute a vehicle body strength member having an upper closed cross-section portion composed of an upper cross-member member 21 and a kick-up panel 19 and a lower closed cross-section portion composed of a lower cross-member member 22 and a kick-up panel 19. Yes.

As shown in FIGS. 1 to 5, the upper cross member member 21 includes a main body portion 23 and a seat attachment portion 24 formed at a position offset from the central portion in the vehicle width direction of the upper cross member member 21 to the right by a small distance. Etc.
As shown in FIGS. 3 to 5, the main body 23 has an upper surface 23 a at the upper end, a front surface 23 b that is inclined downward from the front end of the upper surface 23 a, and a downward and downward inclination from the rear end of the upper surface 23 a. The rear surface portion 23c and the step portion 23d that extends from the upper surface portion 23a in the vehicle width direction are provided. Flange portions that are joined to the upper surface of the front floor panel 11 are provided at lower end portions of the front surface portion 23b and the rear surface portion 23c. The ratio of the length of the right main body portion 23 from the seat mounting portion 24 to the length of the left main body portion 23 from the seat mounting portion 24 is set to a ratio of about 4 to 6.

  The seat attachment portion 24 includes an upper surface portion 24a, a rear surface portion 24b bent vertically downward from a rear end portion of the upper surface portion 24a, and a bulging portion 25 that bulges forward in the vehicle front-rear direction from the front surface portion 23b. The upper surface part 24a is located below the upper surface part 23a of the main body part 23 through the step part 23d, and is formed integrally with the upper surface part 23a through the step part 23d. A flange portion for joining to the upper surface of the front floor panel 11 is provided at the lower end portion of the rear surface portion 24b.

  The bulging portion 25 is connected to the front end portion of the upper surface portion 24a and extends forward from the front end portion, the right side wall portion 25b, the left side wall portion 25c, and the upper wall portion 25a from the front end portion of the upper wall portion 25a. It has an inclined portion 25d. A flange portion joined to the upper surface of the front floor panel 11 is provided at the lower end side portion of the right side wall portion 25b, the left side wall portion 25c, and the inclined portion 25d.

  As shown in FIGS. 1 and 2, a pair of tires that bulge into the cargo space 3 and accommodate a part of a rear wheel (not shown) below the rear side of the pair of cab side panel members 10. A house 15 is provided. A gusset 16 as a reinforcing member is joined to the upper portion of the tire house 15 over the cab side panel member 10 and the tire house 15.

  The gusset 16 includes a vertical surface portion 16a extending in the vertical direction and a horizontal surface portion 16b extending by bending a lower end portion of the vertical surface portion 16a inward of the vehicle body, and has a substantially L-shaped cross section. The vertical surface portion 16a is joined to the cab side panel member 10, and the horizontal surface portion 16b constitutes a part of the upper wall portion of the suspension tower and supports the upper end portion of the shock absorber (not shown) of the rear wheel suspension. The front portion of the gusset 16 is connected to the upper surface of the left and right end portions of the upper cross member member 21 and the upper surface of the rear side frame 7 by the front connecting member 17, and the rear portion of the gusset 16 is connected to the rear side frame 7 by the rear connecting member 18. It is connected to the upper surface. The front and rear connecting members 17 and 18 are formed in a hat shape in cross section, and form a closed cross section in cooperation with the tire house 15.

Next, the rear seat device 30 will be described.
As shown in FIGS. 1 to 6, the rear seat device 30 is a three-seat bench seat, and includes a seat back 31 with a headrest, a seat cushion 32, a fall mechanism 33, a seat belt device 50, and the like. I have. The seat back 31 is configured to be foldable forward with respect to the seat cushion 32.

  As indicated by phantom lines in FIG. 2, the seat back 31 of the rear seat device 30 is divided into two at a position that is divided into about 4 to 6 in the vehicle width direction, that is, at the seat attachment portion 24. Therefore, one right occupant can be seated on the rear seat device 30 on the right side, and two persons, a center occupant and a left occupant, can be seated on the rear seat device 30 on the left side. In addition, by folding the seat back 31 on one side of the left and right side portions of the rear seat device 30, a luggage longer than the longitudinal length of the cargo space 3 is accommodated in the cargo space 3 using the rear surface of the seat back 31. It is also possible to do. The rear seat device 30 on the left side has substantially the same configuration as the rear seat device 30 on the right side except for the seating area, and therefore the rear seat device 30 on the right side on which the right occupant is seated will be described.

  As shown in FIG. 6, the seat back 31 includes a substantially rectangular seat back frame 34 made of a metal square pipe material, and a pair of left and right rotation support brackets extending downward from lower portions at both left and right ends of the seat back frame 34. 35 and a cushioning material or the like covering the whole.

  A pair of left and right pivot shafts 36 that rotatably support the seat back 31 are provided at lower ends of the pair of rotation support brackets 35, respectively. The pivot shaft 36 on the outer side (right side) in the vehicle width direction is supported by a support bracket 37 (see FIG. 2). As shown in FIG. 2, the support bracket 37 is fixed to the upper surface of the rear side frame 7 and in the vicinity of the front side of the front connection member 17. The pivot shaft on the outer side (left side) in the vehicle width direction of the rear seat device 30 on the left side is also supported by the rear end support bracket 37 in the same manner as described above.

  The pivot shaft 36 on the inner side (left side) in the vehicle width direction is supported by the seat mounting portion 24 by a support bracket 38 (see FIGS. 1 to 5). As shown in FIGS. 3 to 5, the support bracket 38 is configured to fasten and fix the bracket main body 38 a that pivotally supports the pivot shaft 36 on the inner side (left side) in the vehicle width direction and the seat bracket 24. And a flange portion 38b. The support bracket 38 also serves as a support bracket that supports the rotation shaft on the inner side (right side) in the vehicle width direction of the rear seat device 30 on the left side portion.

  The flange portion 38b is brought into contact with the upper surface of the upper wall portion 25a of the bulging portion 25 and the upper surface of the inclined portion 25d, and is fastened and fixed to the seat mounting portion 24 by four bolts 26 at four places, upper, lower, left and right. The bracket main body 38a extends forward and upward from the base end fixed to the flange 38b. A distal end portion of the bracket main body portion 38a is provided with a pin hole 38c that pivotally supports the pivot shaft 36, and the pin hole 38c is disposed at a position higher than the upper surface portion 23a of the main body portion 23 (see FIG. 1). .

  As shown in FIG. 6, the seat cushion 32 includes a substantially rectangular seat cushion frame 39 made of a metal square pipe material, and a pair of left and right links fixed to rear end portions of the left and right ends of the seat cushion frame 39. A member 40, a pair of left and right engagement pieces 41 provided on the lower surface of the left and right front end portions of the seat cushion frame 39, and a cushion material that covers the entire seat cushion frame 39 are provided.

  The pair of link members 40 are formed in a substantially square shape so as to curve backward and upward from the seat cushion frame 39. The upper end portion of the link member 40 is pivotally supported by the middle step portion of the rotation support bracket 35 via a pair of left and right pivot pins 42. When the seat back 31 is in use, the pivot pin 42 is pivotally supported. It is connected to the rotation support bracket 35 so as to be located behind and above the shaft 36 (see FIG. 7).

Next, the lodging mechanism 33 will be described.
As shown in FIGS. 6 to 9, the lying mechanism 33 is configured to slide the seat cushion 32 forward and move downward when the seat back 31 is tilted forward from the use state where the seat back 31 is erected. Yes. The fall mechanism 33 includes the pair of pivot shafts 36, the pair of link members 40, the pair of locked pieces 41, the pair of pivot pins 42, and the pair of connecting link members 43. A pair of connecting pins 44, a pair of pivot pins 45, a pair of front support brackets 46, and the like.

  Each connecting link member 43 includes a main body 43a, a locking portion 43b in which an upper end portion of the main body 43a is bent in the vehicle width direction, and a stopper portion 43c in which a lower rear side of the main body 43a is bent in the vehicle width direction. ing. The upper part of the main body 43 a is rotatably connected to the locked piece 41 via a connecting pin 44. Therefore, when the seat back 31 is in a standing state, the locking portion 43b is brought into contact with the front surface of the locked piece 41 and locked.

  As shown in FIGS. 1 and 6 to 9, each connecting link member 43 is rotatably supported by a pair of front support brackets 46. The front support bracket 46 is No. The three cross members 8 are fixed over the upper surface and the front surface.

  The front support bracket 46 includes a bracket body 46a that supports the pivot pin 45 and a flange 46b that is fixed to the lower end of the bracket body 46a. 3 It is fixed to the cross member 8. In the flange portion 46b, the stopper portion 43c is in contact with the horizontal receiving surface portion 46c when the seat back 31 is in a standing state.

Next, the seat belt device 50 worn by the center occupant will be described.
As shown in FIGS. 2 to 5, the seat belt device 50 includes a seat belt (not shown) that restrains an occupant when worn, a retractor 51 that accommodates the seat belt so that the seat belt can be wound and pulled out, and a front end portion of the seat belt. It is comprised from the anchor buckle 52 etc. which can be engaged with the anchor tongue (not shown) installed. The anchor buckle 53 is a right occupant anchor buckle seated on the rear seat device 30 on the right side.

  The retractor 51 is a known emergency seat belt retractor (ELR). The retractor support bracket 54 causes the front portion 23 b and the bulging portion of the main body portion 23 of the upper cross member member 21 to be adjacent to the right side of the seat mounting portion 24. 25 is fixed to the right side wall portion 25b.

  The retractor support bracket 54 has a substantially U-shaped cross section and includes a right wall portion 54a, a central wall portion 54b, and a left wall portion 54c. The retractor 51 is disposed so that its axial center is orthogonal to the wall portions 54a and 54c in a space between the right wall portion 54a and the left wall portion 54c, and the rotation axis of the retractor 51 is the right wall portion. 54a and the left wall 54c.

  The central wall portion 54b is formed in a rectangular shape, and bolt holes are formed at its four corners. Four weld nuts 55 corresponding to the respective bolt holes are joined to the rear surface of the front surface portion 23b corresponding to the bolt holes. By screwing the four bolts 56 inserted into the four bolt holes into the respective weld nuts 55, the central wall portion 54b is fastened to the front surface portion 23b. A synthetic resin spacer 57 is provided between the left wall portion 54 c and the right side wall portion 25 b of the bulging portion 25. The left wall portion 54c is fastened and fixed by two bolts 58 with the spacer 57 sandwiched between the right wall portion 25b.

  The anchor buckle 52 is disposed below the support bracket 38, and is fixed to the upper surface of the inclined portion 25 d of the bulging portion 25 by a bolt 60 by a buckle bracket 59. The buckle bracket 59 includes a bracket main body portion 59a and a flange portion 59b for fastening and fixing to the inclined portion 25d. The bracket main body 59 a supports the anchor buckle 53 simultaneously with the anchor buckle 52, so that the buckle bracket 59 is also used as the anchor buckle 53.

Next, the lying down operation of the rear seat device 30 will be described with reference to FIGS.
As shown in FIG. 7, when the rear seat device 30 is in use, the seat back 31 is rotated clockwise about the pivot shaft 36 supported by the support bracket 37 (see FIG. 2) and the support bracket 38, and the seat back 31 is standing. Therefore, the axial center of the pivot pin 42 is located behind the axial center of the pivot shaft 36 and above the vertical direction by a distance L1.

  At this time, with the movement of the link member 40 connected to the pivot pin 42, the seat cushion frame 39 is pulled rearward and upward compared to the lying down state, and the connection link member 43 rotates clockwise around the pivot pin 45. To do. The stopper portion 43c of the connecting link member 43 abuts on the receiving surface portion 45c of the front support bracket 46 to stop the rotation around the pivot pin 45, and the locking portion 43b locks the front surface of the locked piece 41. Thus, the forward movement of the seat cushion 32 is restricted. The axial center of the connecting pin 44 is located vertically above the axial center of the pivot pin 45 by a distance H1.

  When the rear seat device 30 is folded, the seat back 31 is rotated counterclockwise (forward) about the pivot shaft 36. Then, as shown in FIG. 8, the seat back 31 rotates counterclockwise about the pivot shaft 36, so that the pivot pin 42 moves to the front and lower position as it rotates. FIG. 8 shows a state in the middle of lying down where the vertical distance L2 between the axis of the pivot pin 42 and the axis of the pivot shaft 36 is shorter than the distance L1 in the use state.

  At this time, with the movement of the link member 40 connected to the pivot pin 42, the seat cushion frame 39 is pushed forward and downward, and the connection link member 43 rotates counterclockwise around the pivot pin 45. The stopper portion 43 c of the connecting link member 43 is separated from the receiving surface portion 46 c of the front support bracket 46, and the locking portion 43 b is spaced downward from the front side of the locked piece 41. The vertical distance H2 between the axis of the connecting pin 44 and the axis of the pivot pin 45 is shorter than the distance H1 in the use state. Therefore, the position of the seat cushion 32 is located forward and downward compared to the position in the use state.

  The left rotation of the seat back 31 is continued to bring the rear seat device 30 into a lying state (folding complete). As shown in FIG. 9, when the rear seat device 30 is in the lying down state, the pivot pin 42 moves further forward and downward as compared to the halfway down state. Since the vertical distance L3 between the axis of the pivot pin 42 and the axis of the pivot axis 36 is shorter than the distance L2 in the state of lying down, the step between the rear surface of the seat back 31 and the upper surface of the rear floor panel 12 is made small. can do.

  At this time, the seat cushion frame 39 is further pushed forward and downward, and the connection link member 43 rotates counterclockwise about the pivot pin 45. The stopper portion 43 c of the connection link member 43 abuts on the lower surface of the seat cushion frame 39 and stops the rotation of the connection link member 43. The axial center of the connecting pin 44 is positioned lower than the axial center of the pivot pin 45 by a distance H3, that is, the axial center of the connecting pin 44 is vertically higher by a distance H1 + H3 than in the state of use. It is set low.

  As described above, when the rear seat device 30 is in the lying state, the step between the rear surface of the seat back 31 and the upper surface of the rear floor panel 12 when the seat cushion 32 is pushed down can be reduced by pushing the seat cushion 32 forward and downward. Therefore, the space volume of the luggage compartment space 3 can be increased, and the capacity for storing the luggage on the rear surface of the seat back 31 can be enhanced.

Next, operations and effects of the seat mounting structure according to the first embodiment will be described.
The seat mounting structure includes a front floor panel 11 that forms a floor surface of the passenger compartment space 2, and a rear seat device 30 that includes a seat back 31 and a seat cushion 32 and can be folded. The rear seat device 30 is a front floor panel. No. 11 that extends in the vehicle width direction from the lower end of the seat back 31 by a predetermined distance rearward in the vehicle front-rear direction. 4 cross member 9 is provided. Since the seat attachment portion 24 including the bulging portion 25 that bulges forward in the vehicle front-rear direction is formed on the four cross member 9, and the rear end portion of the rear seat device 30 in the vehicle front-rear direction is attached to the seat attachment portion 24, the rear seat device 30 The distance between the lower end portion of the seat back 31 and the seat mounting portion 24 can be shortened. No. 4 that separated the rear seat device 30 from the lower end of the seat back 31 by a predetermined distance rearward in the vehicle front-rear direction even when the vehicle front-rear direction separation distance from the cross member 9 is large. 4 can be attached to the cross member 9. Therefore, no. Regardless of the position of the four cross members 9, the rear seat device 30 can be freely laid out in the vehicle compartment space 2, the support rigidity of the rear seat device 30 can be increased, and the mounting rigidity of the rear seat device 30 can be ensured.

  No. The four cross member 9 includes an upper cross member member 21 at least a part of which is joined to the upper surface of the front floor panel 11, and the seat attachment portion 24 is formed on the upper cross member member 21. The separation distance in the vertical direction of the member member 21 can be shortened, and the support rigidity of the seat device 30 can be increased.

  Since the support bracket 38 that rotatably supports one end of the seat back 31 of the rear seat device 30 in the vehicle width direction by the pivot shaft 36 is fixed to the seat mounting portion 24, the pivot of the seat back 31 from the seat mounting portion 24 is fixed. The overall length of the support bracket 38 up to the support shaft 36 in the longitudinal direction of the vehicle can be suppressed, and the support rigidity of the seat back 31 can be increased.

  The rear seat device 30 includes a seat belt device 50 that maintains the posture of the occupant, and the retractor 51 of the seat belt device 50 is disposed at a position adjacent to the bulging portion 25 in the vehicle width direction. And No. The retractor 51 can be arranged in a dead space formed between the upper cross member member 21 and the main body portion 23 of the four cross members 9, and space efficiency can be improved.

  Since the retractor 51 is fixed to the front surface part 23b of the main body part 23 and the right side wall part 25b of the bulging part 25 via the retractor support bracket 54 that supports the retractor 51, the support rigidity of the retractor 51 is increased and dead space is reduced. The retractor 51 can be arrange | positioned and space efficiency can be improved. The rear seat device 30 includes anchor buckles 52 and 53 for maintaining the posture of the occupant. Since the anchor buckles 52 and 53 are attached to the inclined portion 25d of the bulging portion 25, the support rigidity of the anchor buckles 52 and 53 is determined based on the weight of the vehicle body. Can be increased without increasing.

  The floor panel is formed continuously with the front floor panel 11 via a front floor panel 11 positioned below the passenger compartment space 2 and a kick-up panel 19 extending upward from the rear end of the front floor panel 11. A rear floor panel 12 positioned above the floor panel 11 is provided. Since the 4 cross member 9 is provided on the kick-up panel 19, the rear seat device 30 is set to No. 4 without reducing the length of the rear floor panel 12 in the vehicle front-rear direction. 4 It can be attached to the cross member 9 and a large cargo space 3 can be secured. In addition, the seat device 30 and The vertical separation between the upper cross member member 21 of the four cross members 9 can be shortened, and the support rigidity of the seat device 30 can be increased.

Next, the seat mounting structure of Example 2 will be described with reference to FIGS.
In this seat mounting structure, instead of the support bracket 38, a support bracket 38A that supports the pivot shaft 36 at a position lower than the vertical height of the upper surface portion 23a of the main body 23 is employed. The same main components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different components are described.
12 and 13, the seat belt device 50 is omitted for convenience of explanation.

  The seat attachment portion 24A of the vehicle 1A includes an upper surface portion 24a facing upward, a rear surface portion 24b, and a bulging portion 25A that bulges forward in the vehicle front-rear direction. The upper surface part 24a is located below the upper surface part 23a of the main body part 23 via the step part 23d, and is formed integrally with the upper surface part 23a via the step part 23d. The bulging portion 25A includes a curved portion 25e that is gently bent downward and connected to the front floor panel so as to project forward from the front end portion of the upper surface portion 24a, a right side wall portion 25f, and a left side wall portion 25g. .

The support bracket 38A includes a bracket main body portion 38d that supports the pivot shaft 36 on the inner side (left side) in the vehicle width direction, and a flange portion 38e for fastening and fixing the support bracket 38A to the seat attachment portion 24A.
The flange portion 38e is formed in a substantially curved shape so as to follow the upper surface of the curved portion 25e, is in contact with the upper surface of the curved portion 25e of the bulging portion 25A, and is curved by four bolts 26 at the upper, lower, left and right portions. It is fastened and fixed to the portion 25e. The bracket main body 38d is disposed in an inclined manner forward and upward from the base end connected to the flange 38e. A distal end portion of the bracket body portion 38d is provided with a pin hole 38f that pivotally supports the pivot shaft 36, and the pin hole 38f is set at a position lower than the upper surface portion 24a of the seat attachment portion 24A.

  As shown in FIG. 14, in order to arrange the pivot shaft 36 of the seat back 31 lower than the upper surface portion 23a and the upper surface portion 24a of the main body portion 23, when the seat back 31 is lying down, the luggage compartment floor surface and the seat back rear surface are arranged. It can be flattened, and the rear surface of the seat back can be used as a part of the luggage compartment without impairing the luggage storage performance.

Next, the seat mounting structure of Example 3 will be described with reference to FIGS.
In this seat mounting structure, a seat device 30A that supports the retractor 51 is employed. Main components similar to those of the second embodiment are illustrated with the same reference numerals, description thereof is omitted, and only different components are described.

  As shown in FIG. 15, the seat device 30A of the vehicle 1B includes a retractor support member 61 for supporting the retractor 51A to the seat device 30A. The retractor support member 61 is stretched between the pair of link members 40, and the left and right end portions of the retractor support member 61 are fixed to the respective link members 40 below the lower end portion of the seat back 31.

  The retractor 51A is arranged in the vehicle width direction so that its axis is substantially parallel to the retractor support member 61, and is supported by the retractor support member 61 via the retractor support bracket 54A. In the present embodiment, the retractor 51A is disposed below the lower end portion of the seat back 31 and substantially in the center in the vehicle width direction. The retractor support bracket 54A has a rectangular central wall portion 54b fastened and fixed to the retractor support member 61 by a bolt.

  As shown in FIGS. 16 and 18, when the seat back 31 is in use, the retractor 51 </ b> A can be disposed in a dead space formed between the lower end portion of the seat back 31 and the main body portion 23 of the upper cross member member 21. , Can increase the space efficiency.

  As shown in FIGS. 17 and 19, when the seat back 31 is in the lying down state, the link member 40 moves to the front and lower position as the seat back 31 is in use as the seat cushion 32 moves. The retractor 51 </ b> A does not protrude into the cargo space 3, and does not hinder luggage storage performance. Furthermore, the mounting process of mounting the retractor 51A to the vehicle body side member can be omitted, and the retractor 51 and the seat device 30A can be integrated to reduce the size of components and the like.

Next, a modification in which the above embodiment is partially changed will be described.
1] In the above embodiment, the upper cross member member, the lower cross member member, and the front floor panel between them are used for No. 1 Although the example which comprised 4 cross members was demonstrated, it should just be a vehicle body strength member, and a bulging part can be formed with the cross member provided with the single closed cross-section part.

2] In the above embodiment, an example in which the cross member is provided with one bulging portion has been described. However, it is also possible to provide the cross member at a plurality of locations. For example, when the rear seat device is divided into three equal parts and can be laid down, it is possible to provide two seat attachment portions at the left and right division positions and to provide two bulge portions.

3] In the above-described embodiments, the example in which the retractor is fixed to the upper cross member member and the example in which the retractor is fixed to the seat device have been described, but it is also possible to use both of them together. For example, the retractor for the left and right occupant may be fixed to the seat device, and the retractor for the center occupant may be fixed to the upper cross member member, and conversely, the retractor for the left and right occupant is fixed to the upper cross member member and The retractor may be fixed to the seat device.

4) In the above-described embodiment, an example has been described in which an overturning mechanism that moves the seat cushion forward and downward when the seatback is in the overturned state is described. However, the present invention is applied to a seat device that omits the overturning mechanism. It is also possible.

5) In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention relates to a vehicle seat mounting structure having a foldable rear seat device, and in particular, by providing a seat mounting portion for mounting a part of the rear seat device to a cross member at the rear of the seat back, while increasing the severity of the layout of the rear seat device. Support rigidity can be improved.

1, 1A, 1B Vehicle 2 Cabin space 9 4 cross member 11 front floor panel 12 rear floor panel 21 upper cross member member 22 lower cross member member 23 main body portion 23a upper surface portion 23d step portion 24 seat mounting portion 25, 25A bulging portion 30, 30A rear seat device 31 seat back 32 seat Cushion 36 Rotating shaft 38, 38A Rear center support bracket 50 Seat belt device 51, 51A Retractor 52, 53 Anchor buckle 54, 54A Retractor support bracket

Claims (8)

In a vehicle seat mounting structure for mounting a floor panel that forms a floor surface of a passenger compartment, and a foldable rear seat device that includes a seat back and a seat cushion, and the rear seat device is attached to the floor panel.
A cross member extending in the vehicle width direction with a predetermined distance from the lower end of the seat back to the rear in the vehicle front-rear direction;
Forming a seat mounting portion including a bulging portion bulging forward in the vehicle front-rear direction on the cross member, and attaching a part of the rear seat device to the seat mounting portion ;
The vehicle seat mounting structure , wherein the cross member includes an upper cross member member at least a part of which is joined to the upper surface of the floor panel, and the seat mounting portion is formed on the upper cross member member. . The vehicle seat mounting structure according to claim 1 , wherein a support bracket that rotatably supports one end portion of the seat back of the rear seat device in the vehicle width direction is provided in the seat mounting portion . The upper surface of the seat mounting portion is formed lower than the upper surface of the main body portion of the cross member through the step portion,
The vehicle seat mounting structure according to claim 1 or 2 , wherein the support bracket is mounted such that a center of rotation of the seat back is positioned below an upper surface of a main body portion of the cross member . The rear seat device includes a seat belt device that holds the posture of an occupant,
The vehicle seat mounting structure according to any one of claims 1 to 3 , wherein the retractor of the seat belt device is disposed at a position adjacent to the bulging portion in the vehicle width direction . 5. The vehicle seat attachment according to claim 4 , wherein the retractor is attached to the rear seat device so as to be adjacent to the bulging portion in the vehicle width direction when the rear seat device is in use. Construction. The vehicle seat mounting structure according to claim 4 , wherein the retractor is fixed to the cross member and the bulging portion via a retractor support bracket that supports the retractor . The rear seat device includes a seat belt device buckle for maintaining the posture of the occupant,
The vehicle seat mounting structure according to any one of claims 1 to 6 , wherein the buckle is mounted on the bulging portion . The floor panel is formed continuously with the front floor panel via a front floor panel that forms the lower surface of the passenger compartment and a kick-up portion that extends upward from the rear end of the front floor panel, and is more than the front floor panel. With a rear floor panel located above,
The vehicle seat mounting structure according to claim 1 , wherein the cross member is provided in the kick-up portion .