JP2011011612A - Lower vehicle body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a low floor of a cabin by installing seat rails at a low position while ensuring the rigidity of a vehicle body.SOLUTION: A lower vehicle body structure of a vehicle includes a floor panel 1 forming a bottom part of a cabin, seat rails 13 installed extending in the longitudinal direction of a vehicle body along the floor panel 1, an occupant seat 3 support in a longitudinally movable manner along the seat rails 13, and a cross member 17 installed extending in the vehicle width direction along the floor panel 1, and projecting upward of an upper surface of a cabin floor 21. A downwardly recessed part 22 is formed in a vicinity of a center part in the vehicle width direction of the cross member 17, and the seat rails 13 are installed so as to pass the recessed part 22.

Description

  The present invention includes a floor panel that forms a bottom portion of a passenger compartment, and a seat rail that is installed so as to extend in the front-rear direction of the vehicle body along the floor panel. The present invention relates to a lower body structure of a vehicle that is movably supported.

  Conventionally, as shown in Patent Document 1 below, for the purpose of diversifying seat arrangement patterns, a floor panel that forms the bottom of a passenger compartment, and the rear of a vehicle body along the left and right side portions of the floor panel. A cross that extends in the vehicle width direction on the floor panel in a vehicle including a seat rail having a pair of left and right long rails extending to the vicinity of the end portion and an occupant seat that is slidably supported along the seat rail. A member and a rail bracket connected to the wall surface of the cross member and extending in the front-rear direction of the vehicle body are installed, and the seat rail is attached to the rail bracket.

  Further, as shown in Patent Document 2 below, the seat cushion is foldably supported by a hinge device provided in front of a rail device that supports an occupant's seat so as to be movable back and forth, and the seat rail device and the seat cushion frame described above are supported. In order to improve the support rigidity of the occupant seat without increasing the number of the lock device, in the vehicle seat configured to fix the occupant seat to the floor by a locking device provided between the Providing a pressing member that is pressed against the floor by the urging force of the urging member provided on both rear sides of the seat cushion frame is performed.

JP 2008-105508 A JP 2000-94991 A

  When the seat rail having a pair of left and right long rails extending to the vicinity of the rear end portion of the vehicle body along the left and right side portions of the floor panel is disposed as disclosed in Patent Document 1, for example, a driver's seat Easy by slidably supporting the middle row seat arranged on the rear side of the seat and the passenger seat and the rear row seat arranged on the rear side along the seat rail comprising the long rail. With such a configuration, there is an advantage that a variety of seat arrangements can be realized by moving the occupant seat including the middle row seat and the rear row seat over a wide range.

  However, in the lower body structure according to Patent Document 1, a cross member is installed to extend in the vehicle width direction on the top surface of the floor panel that forms the bottom of the passenger compartment, and the seat rail is fixed on the cross member. Since it is configured to sufficiently secure the support rigidity of the occupant seat and the vehicle body rigidity, the installation position of the occupant seat that is slidably supported along this seat rail is unavoidable, There is a problem that it is difficult to flatten the floor surface of the passenger compartment or to lower the floor.

  In order to make the seat rail installation height as low as possible while flattening the floor surface of the passenger compartment to lower the passenger compartment, the cross member installed on the upper surface of the floor panel is omitted, or the It is conceivable to reduce the vertical dimension. However, in such a configuration, it is not possible to prevent a decrease in the operability due to the fact that the effect of improving the vehicle body rigidity by the cross member is not sufficiently obtained, and the vehicle body is not deformed at the time of a side collision. There is a problem that it cannot be effectively suppressed.

  Further, as shown in Patent Document 2, in a vehicle including a rail device that supports an occupant seat so as to be movable back and forth, and a pressing member that is pressed against the floor by the biasing force of the biasing member, When the cross member is installed on the upper surface of the floor panel so as to extend in the vehicle width direction, the urging member interferes with the cross member when the occupant seat is moved back and forth along the seat rail device. There is a problem that the range of front and rear movement of the seat is limited.

  The present invention has been made in view of the above-described problems, and has a vehicle body structure that can lower a vehicle cabin by lowering a passenger compartment by installing a seat rail at a low position while ensuring the rigidity of the vehicle body. It is intended to provide.

  The invention according to claim 1 is a floor panel that forms the bottom of the passenger compartment, a seat rail that is installed so as to extend in the front-rear direction of the vehicle body along the floor panel, and is movable back and forth along the seat rail. A supported occupant seat, and a cross member installed so as to extend in the vehicle width direction along the floor panel and to protrude upward from the floor surface of the passenger compartment. In the vicinity of the portion, a recessed portion that is recessed downward is provided, and the seat rail is installed so as to pass through the recessed portion.

  According to a second aspect of the present invention, in the lower body structure of the vehicle according to the first aspect, a plurality of rows of occupant seats arranged at the front and rear of the vehicle interior are slidably supported along the seat rail. It has been done.

  According to a third aspect of the present invention, in the lower body structure of the vehicle according to the first or second aspect, a lower section that forms a closed cross section extending in the vehicle width direction along the lower surface of the floor panel is provided below the cross member. A frame is provided.

  The invention according to claim 4 is the vehicle lower body structure according to any one of claims 1 to 3, wherein a gap is formed between the recessed portion of the cross member and the seat rail, A reinforcing member is installed so as to cover this gap.

  According to a fifth aspect of the present invention, in the lower body structure of the vehicle according to the fourth aspect of the present invention, the reinforcing member includes a joint portion that is joined to a side wall surface of the seat rail.

  According to a sixth aspect of the present invention, in the vehicle lower body structure according to any one of the first to fifth aspects, the left and right rear wheels installed so that the cross member bulges toward the vehicle interior side. The houses are arranged so as to connect each other.

  In the invention according to claim 1, since the recessed portion that is recessed downward is provided near the center of the cross member in the vehicle width direction, and the seat rail is installed so as to pass through the recessed portion, the recessed portion is crossed. As in the case where the member is formed on the outer side in the vehicle width direction, the vehicle body is improved by making the seat rail installation height as low as possible without causing a situation where the reinforcing action of the vehicle body by the cross member is impaired. While lowering the floor, there is an advantage that the vehicle body rigidity can be sufficiently secured to improve the operability of the vehicle effectively, and the deformation of the vehicle body can be effectively suppressed during a side collision of the vehicle.

  In the invention according to claim 2, since the plurality of rows of occupant seats arranged in the front and rear of the vehicle interior are supported so as to be slidable along the seat rail, the occupant seats can be mounted on the vehicle with a simple configuration. By moving in the front-rear direction, the seat arrangement can be varied in a variety of ways by efficiently using the vehicle interior space.

  In the invention according to claim 3, since the lower frame forming the closed cross section extending in the vehicle width direction along the lower surface of the floor panel is provided below the cross member, the cross member formed by forming the recessed portion is provided. The lowering of the strength can be sufficiently compensated for by the lower frame, and there is an advantage that the seat rail can be installed at a low position and the cabin can be lowered while securing the rigidity of the vehicle body.

  In the invention according to claim 4, since a gap is formed between the recessed portion of the cross member and the seat rail, and a reinforcing member is installed so as to cover the gap, the recessed portion formed on the upper surface of the cross member. By forming the concave portion into a constricted shape, the recessed portion can be easily formed by means such as pressing, and the strength reduction due to the formation of the gap is effectively compensated by the reinforcing member. While securing rigidity, there is an advantage that the seat rail can be installed at a low position to lower the cabin floor.

  In the invention according to claim 5, since the reinforcing member is provided with a joint portion joined to the side wall surface of the seat rail, the load input to the seat rail at the time of a side collision of the vehicle is transmitted from the reinforcing member to the cross member. Therefore, there is an advantage that the vehicle body can be effectively supported by being transmitted to the vehicle body and the vehicle body rigidity can be sufficiently improved with a simple configuration.

  In the invention according to claim 6, since the left and right rear wheel houses installed so as to bulge toward the vehicle interior side are connected to each other by the cross member, the vehicle is driven from the rear suspension to the rear wheel house. Since the input load, the side impact load input at the time of a side collision of the vehicle and the like can be effectively supported by the cross member, the rigidity of the vehicle body and the safety of the vehicle can be effectively achieved with a simple configuration. There is an advantage that can be improved.

It is side surface sectional drawing which shows embodiment of the lower vehicle body structure of the vehicle which concerns on this invention. It is a top view which shows the vehicle interior structure of the said vehicle. It is a top view which shows the specific structure of the said lower vehicle body structure. It is a perspective view which shows the specific structure of a cross member. It is front sectional drawing which shows the specific structure of the passenger | crew seat of a back row. It is front sectional drawing which shows the specific structure of a cross member. It is a top view which shows the specific structure of a cross member. It is front sectional drawing which shows the specific structure of the passenger | crew seat of a middle row. It is side surface sectional drawing which shows the specific structure of the passenger | crew seat of a back row. It is side surface sectional drawing which shows the state which moved the passenger | crew seat of the back row ahead. It is a top view which shows specific structures, such as a locking mechanism.

  1 and 2 show an embodiment of a lower body structure of a vehicle according to the present invention. In this vehicle, a front row seat having a driver seat and a passenger seat (not shown) is disposed on a floor panel 1 that forms the bottom of the passenger compartment, and a middle row of passenger seats 2 on the rear side thereof. And a so-called minivan type of a three-row seat in which a rear row passenger seat 3 is disposed. The middle-row occupant seat 2 is composed of a left seat 2a and a right seat 2b each having a seat cushion 4 and a seat back 5 independent on the left and right. On the other hand, the passenger seat 3 in the rear row is of a so-called bench seat type having an integral seat cushion 6 and a seat back 7 extending in the vehicle width direction.

  Further, on the lower surface of the floor panel 1, a lower side frame lower member 8 made of a hat-shaped member having an open upper surface is installed so as to extend in the front-rear direction of the vehicle along both left and right side portions. FIG. 3 shows a state in which the floor panel 1 is viewed from above with the occupant seats 2, 3 and the like removed. As shown in FIG. 3, a rear wheel house 9 is provided on both left and right sides of the rear part of the vehicle body so as to bulge toward the vehicle interior side, and a side sill 10 extends in the front-rear direction of the vehicle body on the front side. It is installed as follows. Further, on the rear left and right of the upper surface of the floor panel 1, an upper member 11 of a rear side frame made of a rigid member having a hat-shaped cross section with an open bottom surface extends in the longitudinal direction of the vehicle body along the installation portion of the lower member 8. It is arranged.

  On the floor panel 1, a pair of left and right outer seat rails (short rails) 12 and 12 and a pair of left and right inner seat rails 13 and 13 (long rails) extending in the front-rear direction between the outer seat rails 12 and 12. And are installed. As shown in FIGS. 4 and 5, the outer seat rail 12 and the inner seat rail 13 are made of channel steel having a C-shaped cross section having a predetermined strength and rigidity with an upper surface opened, and these outer seat rails 12. The occupant seats 2 and 3 are slidably supported along a predetermined range in the front-rear direction along the inner seat rail 13.

  The inner seat rail 13 extends from a substantially central portion in the front-rear direction in the vehicle interior adjacent to the installation portion of the front row seat (not shown) to the rear end portion of the vehicle body, specifically, the installation portion of the rear bumper reinforcement 14. A mounting plate 15 provided at the rear end of the inner seat rail 13 is fixed to the upper portion of the rear bumper reinforcement 14 via mounting bolts or the like (see FIGS. 1 and 3). On the other hand, the outer seat rail 12 extends from a position close to the installation portion of the front row seat to the vicinity of the middle portion in the front-rear direction of the rear wheel house 9, and its entire length is set shorter than the inner seat rail 13.

  In the vehicle interior, there are a plurality of cross members made of a hat-shaped member in section, that is, Nos. 3 to 5 located from the front side of the vehicle body. 3-No. No. 5 cross members 16 to 18 are installed so as to extend in the vehicle width direction along the upper surface of the floor panel 1 and protrude into the vehicle interior (upward). 3-No. The outer seat rail 12 and the inner seat rail 13 are respectively installed in an inclined state of front-lowering via the five cross members 16 to 18. In addition, on the lower surface of the floor panel 1, no. By disposing the lower frame 20 having a hat-shaped cross section along the four cross members 17, a closed cross section 19 extending in the vehicle width direction is formed by the lower frame 20 and the floor panel 1.

  On the upper surface of the floor panel 1, a conventionally well-known floor trim material 21 provided with an insulator made of a felt material or glass wool having a sound insulation function and a heat insulation function, and a surface layer material made of a carpet material or the like covering the upper surface. Is installed. And said No .. 3 cross member 16 and no. 5 cross member 18 is equivalent to the vertical dimension of the said outside seat rail 12 and the inside seat rail 13 rather than the floor surface (refer FIG. 1 and FIG. 5) of the vehicle interior in which the upper surface position consists of the upper surface of the said floor trim material 21. FIG. The distance is set low. Thereby, the above-mentioned No. 3 cross member 16 and no. 5 The upper surface of the outer seat rail 12 and the inner seat rail 13 fixed on the cross member 18 and the upper surface of the floor trim material 21 are configured to be flush with each other.

  On the other hand, the above-mentioned No. The four cross member 17 is disposed so as to connect both the rear wheel houses 9 and 9 between the left and right rear wheel houses 9 and 9, and is located above the upper surface (floor surface) of the floor trim material 21. . The vertical dimension is set so that the upper surface of the four cross member 17 protrudes. And said No .. The rear end of the outer seat rail 12 is connected to the front surfaces of the left and right sides of the cross member 17 and The front end portion of the upper member 11 of the rear side rail is connected to the rear surfaces of the left and right side portions of the four cross member 17. The outer seat rail 12 and the rear side rail upper member 11 are installed so as to be continuous in the front-rear direction via the four cross members 17 (see FIG. 3).

  Moreover, as shown in FIGS. 4 to 7, the No. corresponding to the installation portion of the inner seat rail 13. In the vicinity of the center of the cross member 17 in the vehicle width direction, a recessed portion 22 that is recessed downward is formed. The inner seat rail 13 is installed so as to straddle the front and rear of the four cross members 17. No. above. The recessed portion 22 of the four cross member 17 is formed in a trapezoidal shape that expands upward in a front view, and the vehicle width direction dimension is set to be larger than the width dimension of the inner seat rail 13, whereby the recessed portion A predetermined gap 23 is formed between the inner seat rail 13 and the inner seat rail 13. Furthermore, the reinforcing member 24 is disposed along the left and right wall surfaces of the inner seat rail 13 by installing the reinforcing member 24 so as to cover the gap 23.

  The reinforcing member 24 includes a trapezoidal upper surface plate 25 that is formed to expand toward the side wall surface of the inner seat rail 13 in a plan view, and a pair of front and rear side plates that project downward from the oblique sides. 26. And the outer edge part of the said upper surface board 25 and the lower side part of the side plate 26 are said No .. While being joined to the upper surface and the side surface of the four cross member 17, a joining flange 27 provided at the tip of the side plate 26 is joined to the side wall surface of the inner seat rail 13. In this manner, with the gap 23 formed between the recessed portion 22 and the inner seat rail 13 covered with the reinforcing member 24, the recessed portion 22 and the inner seat rail 13 are connected via the reinforcing member 24. The connection part of is reinforced.

  The left seat 2a constituting the middle row passenger seat 2 has a pair of left and right slide members 29 provided on the bottom surface of the seat cushion 4, as shown in FIG. By sliding displacement along the rail 12 and the inner seat rail 13, the outer seat rail 12 is supported so as to be movable back and forth within the installation range of the outer seat rail 12. On the other hand, the right seat 2b of the passenger seat 2 has a pair of left and right slide members 29 provided at the bottom of the seat cushion 6 along the outer seat rail 12 and the inner seat rail 13 provided on the right side of the vehicle body. By sliding displacement, the outer seat rail 12 is supported so as to be movable back and forth within the installation range.

  Further, the slide member 29 of the occupant seat 2 is provided with a lateral slide rail 30 on its upper surface for supporting the seat cushion 4 so as to be slidable in the vehicle width direction. The seat cushion 6 of the occupant seat 2 slides and displaces in the vehicle width direction along the lateral slide rail 30, thereby adjusting the installation positions of the left seat 2 a and the right seat 2 b in the left-right direction, and both seats. The installation interval between 2a and 2b is adjusted.

  As shown in FIGS. 5 and 9, the rear row of the occupant seat 3 has a pair of left and right slide members 31 that slide and displace along the inner seat rails 13, 13 in the vicinity of the center of the lower surface of the seat cushion 6. They are arranged at a predetermined interval. Further, on the passenger seat 3 in the rear row, a seat support member 32 that supports the passenger seat 3 on the floor surface of the passenger compartment composed of the upper surface of the upper member 11 of the rear side frame is provided on the lower surface of the seat cushion 6. By being provided at the front portion, the seat support member 32 and the slide member 31 are respectively disposed on the left and right sides of the lower surface of the seat cushion 6 in a state of being separated in the vehicle width direction.

  The seat support member 32 includes a support bracket 33 attached to the lower surface of the seat cushion 6, a support leg 35 swingably connected to the support bracket 33 via a connection pin 34, and the support leg 35. And a roller 36 pivotally supported at the lower end of the roller. In addition, a lock member 37 made of a lock pin or the like is provided below the support bracket 33 to restrict the swinging displacement of the support leg 35 and hold the support leg 35 in an upright state.

  That is, the distal end portion of the lock member 37 is urged toward the support leg 35 in accordance with the urging force of the urging member composed of a compression coil spring or the like (not shown), and the engagement formed on the support leg 35. When the leading end of the lock member 37 is inserted into a joint hole (not shown), the support leg 35 is normally held upright. In this way, the support leg 35 is held upright while the bottom surface of the roller 36 is in contact with the upper member 11 of the rear side frame, thereby supporting the passenger seat 3 on the floor surface. A sheet support member 32 is configured.

  As shown in FIG. 11, the slide member 31 of the occupant seat 3 is provided with a lock mechanism including a lock arm 40 that restricts the forward and backward movement of the slide member 31, and a locking piece 41 provided at the distal end portion thereof. The sliding displacement of the seat cushion 6 is restricted by being fitted into the engagement hole formed in the inner seat rail 13 in accordance with the urging force of the urging member (not shown). An operation for operating the locking piece 41 to disengage from the engagement hole of the inner seat rail 13 by swinging and displacing the lock arm 40 via a wire 43 in front of the lower surface of the seat cushion 6. A handle 44 is provided. When the occupant grasps the operation handle 44 and performs the unlocking operation, the sliding restriction state of the occupant seat 3 by the lock arm 40 is released, and the occupant seat 3 is allowed to move back and forth. It is configured.

  Further, the operation handle 44 is driven by the lock member 37 of the seat support member 32 in conjunction with the operation, so that the swinging displacement of the operation handle 44 from the lock position where the support leg 35 is held in an upright state. A wire 45 for displacing to a permissible unlock position is connected. When an occupant in the vehicle interior operates the operation handle 44 to drive the lock arm 40 and thereby performs an operation of releasing the sliding restriction state of the occupant seat 3, the lock member is interlocked with this operation. A driving force for driving 37 to the unlocked position is applied through the wire 45 so that the swinging displacement of the support leg 35 is allowed.

  The occupant moves the occupant seat 3 in the longitudinal direction of the vehicle along the inner seat rail 13 in a state where the occupant operates the operation handle 44 to release the restriction of the occupant seat 3 by the lock arm 40. When the occupant seat 3 is moved back and forth, the locking member 37 is driven to the unlocked position and the swinging displacement of the supporting leg 35 is allowed. 4 when the installation part of the cross member 17 is reached. The seat support member 32 is displaced so as to get over the four cross members 17.

  And after moving the said passenger | crew seat 3 of the said back row back and forth, the latching piece 41 of the said lock arm 40 is engaged with the engagement hole of the inner side seat rail 13, and the said passenger | crew seat 3 is made into a movement control state. When the operation is performed, a biasing member made of a compression coil spring or the like is inserted into the engagement hole of the support leg 35 which is brought up in response to a biasing force of a biasing means consisting of its own weight or a torsion coil spring or the like not shown. The support leg 35 is held in an upright state by inserting the distal end portion of the lock member 37 in accordance with the urging force. As a result, the occupant seat 3 is supported on the floor surface formed by the upper surface of the upper member 11 of the rear side frame or the outer rail 11 by the seat support member 32.

  Further, the seat cushion 6 of the occupant seat 3 includes seat belt buckles 47 to 49 for restraining the occupant seated on the occupant seat 3 in a plan view, as shown in FIGS. It is disposed at a position overlapping the inner seat rail 13, that is, near the center side in the vehicle width direction of the occupant seat 3. The left and right buckles 47 and 49 are engaged with locking brackets provided on seat belts (not shown) pulled out from retractors disposed on the sides of the vehicle body by passengers seated on the left and right sides of the passenger seat 3. In addition, the occupant seated on the occupant seat 3 is restrained by engaging a latch of a seat belt (not shown) provided at the center of the occupant seat 3 with the buckle 48. Has been protected.

  The floor panel 1 forming the bottom of the passenger compartment as described above, the outer seat rail 12 and the inner seat rail 13 installed so as to extend in the front-rear direction of the vehicle body along the floor panel 1, the seat rail 12, The passenger seats 2 and 3 supported so as to be movable back and forth along No. 13 and No. 1 installed so as to extend in the vehicle width direction along the floor panel 1 and protrude above the floor surface of the passenger compartment. 4 cross member 17. In the vicinity of the center of the cross member 17 in the vehicle width direction, a recessed portion 22 that is recessed downward is provided, and the inner seat rail 13 is installed so as to pass through the recessed portion 22, thereby ensuring the rigidity of the vehicle body. There is an advantage that the interior seat rail 13 can be installed at a low position to lower the vehicle floor.

  That is, in the said embodiment, the recessed part 22 used as the installation part of a pair of inner side seat rails 13 and 13 which supports the back passenger | crew seat 3 which consists of a bench seat provided with the integral seat cushion 6 extended in a vehicle width direction is provided. , No. above. Since the four cross members 17 are formed, as shown by the phantom lines in FIG. As in the case where the inner seat rail 13 is installed on the upper surface of the four cross member 17, the installation height of the inner seat rails 13, 13 and the upper end portion 3a of the passenger seat 3 are prevented from being positioned upward. However, the above-mentioned No. The vehicle body can be effectively reinforced by the four cross members 17.

  And said No .. When the recessed portion 22 is formed on the outer side in the vehicle width direction of the four cross member 17, the strength of the portion where the vibration load and the like during traveling input from the rear suspension to the rear wheel house 9 is concentrated decreases. And No. above. There is a tendency that the reinforcing action of the vehicle body by the four cross members 17 cannot be obtained sufficiently. On the other hand, as described above, the recessed portion 22 is No. No. 4 when formed near the center of the cross member 17 in the vehicle width direction. Since the vehicle body can be sufficiently reinforced by the four cross members 17, the installation height of the inner seat rail 13 can be made as low as possible by providing the recessed portion 22, and the vehicle compartment can be lowered and the vehicle body can have sufficient rigidity. Thus, there are advantages that the vehicle stability can be effectively improved and the deformation of the vehicle body can be effectively suppressed at the time of a side collision.

  Further, in the above-described embodiment, a plurality of rows of passenger seats including the middle row of passenger seats 2 and the rear row of passenger seats 3 disposed on the front and rear sides of the vehicle interior are arranged on the outer rail 12 and the inner seat rail 13. Since each of the occupant seats 2 and 3 is moved in the longitudinal direction of the vehicle with a simple configuration, the vehicle interior space can be used efficiently, and a variety of seat arrangements can be realized. There are advantages. In particular, when the inner seat rail 13 is formed by a long rail extending from the proximity position of the front row seat to the rear end of the vehicle body as described above, the occupant seat 3 is formed along the inner seat rail 13. The slide member 31 is slid and displaced, so that Since the occupant seat 3 can be moved greatly so as to straddle the front and rear of the four cross members 17, the seat arrangement can be changed in various ways.

  The present invention is limited to a three-row seat type vehicle in which a middle row passenger seat 2 and a rear row passenger seat 3 are arranged on the rear side of the front row seat including the driver seat and the passenger seat. However, the present invention can also be applied to a two-row seat type vehicle including a front row seat and a rear row seat behind the front row seat, or a multi-row seat type vehicle in which three or more rear row seats are arranged behind the front row seat.

  Moreover, as shown in the said embodiment, said No. in which the recessed part 22 for seat rail installation was formed. When the lower frame 20 that forms the closed cross section 19 extending in the vehicle width direction along the lower surface of the floor panel 1 is provided below the four cross members 17, No. 4 due to the formation of the recessed portion 22. The lower strength of the four cross members 17 can be sufficiently compensated for by the lower frame 20, so that the vehicle interior can be lowered by installing the inner seat rail 13 at a low position while ensuring the rigidity of the vehicle body. There is.

  Furthermore, in the above-described embodiment, no. Since the gap 23 is formed between the recessed portion 22 formed in the 4 cross member 17 and the inner seat rail 13 installed in the recessed portion 22, the above-mentioned No. 4 cross member 17 is formed. By forming the recessed portion 22 formed on the upper surface of the four cross member 17 into a constricted shape, the recessed portion 22 can be easily formed by means such as press working. And since it comprised so that the strength reduction resulting from this clearance gap 23 being formed by installing the reinforcement member 24 so that the clearance gap 23 might be covered, while ensuring the rigidity of a vehicle body, There is an advantage that the inner seat rail 13 can be installed at a low position to lower the vehicle floor.

  In particular, as shown in the above-described embodiment, when the reinforcing member 24 is provided with a joint portion including a joint flange 27 joined to the side wall surface of the inner seat rail 13, the reinforcing member 24 and the inner seat The rail 13 can be firmly coupled. Therefore, the load input to the inner seat rail 13 at the time of a side collision of the vehicle is transmitted from the reinforcing member 24 to No. Since it can be transmitted to and supported by the four cross members 17, there is an advantage that the rigidity of the vehicle body can be effectively improved with a simple configuration.

  In addition, as shown in the above embodiment, No. When the four cross members 17 are arranged so as to connect the left and right rear wheel houses 9 and 9 installed so as to bulge out to the vehicle interior side, the rear wheel is removed from the rear suspension when the vehicle is running. The load input to the house 9, the side impact load input at the time of a side impact of the vehicle, etc. Since it can be effectively supported by the four cross members 17, there is an advantage that the rigidity of the vehicle body and the safety of the vehicle can be effectively improved with a simple configuration.

  In the above-described embodiment, the above-mentioned No. is applied to the passenger seat 3 in the rear row. A seat that supports the occupant seat 3 on the floor surface of the passenger compartment formed by the slide member 31 that slides and displaces along the inner seat rail 13 so as to straddle the front and rear of the four cross members 17 and the floor trim material 21 and the like. A support member 32 is provided, and this seat support member 32 is used for moving the occupant seat 3 back and forth. 4 Since it is configured to be displaceable so that it crosses over the cross member 17, There is an advantage that the occupant seat 3 can be stably supported by both the slide member 31 and the seat support member 32 while sufficiently ensuring the reinforcing function of the vehicle body by setting the upward protrusion amount of the four cross member 17 large. .

  In particular, as shown in the above embodiment, the slide member 31 that slides and displaces along the inner seat rail 13, 4 When the seat support member 32 that can be displaced so as to get over the cross member 17 is disposed in a state of being separated in the vehicle width direction of the occupant seat 3, the occupant seat 3 can be configured with a simple configuration. Since the support strength can be further improved, there is an advantage that it is possible to effectively prevent the passenger seat 3 from rattling during traveling of the vehicle and to ensure the comfort of the passenger.

  Further, in the above-described embodiment, the seat belt buckles 47 to 49 for restraining the occupant seated on the occupant seat 3 are disposed at positions that overlap the seat rail 13 in a plan view. The load input to the occupant seat 3 via 49 can be transmitted to the seat rail 13 and effectively supported. Therefore, even when a large load is applied to the seat belt in the event of a vehicle collision or the like, problems such as deformation of the seat cushion 6 of the occupant seat 3 or reduction of the restraining force of the occupant may occur. And there is an advantage that the sitting posture of the occupant can be stably maintained.

  Further, as shown in the above embodiment, the rear side frame upper members 11 extending in the front-rear direction of the vehicle body are installed on the left and right sides of the upper surface of the floor panel 1, and the rigid members including the seat support members 32 are arranged on the upper members 11. In this case, the upper member 11 can effectively reinforce the left and right side portions of the rear portion of the vehicle body, and the support function of the occupant seat 3 by the seat support member 32 on the upper member 11 is sufficient. Can be demonstrated. For this reason, there is an advantage that it is possible to effectively prevent the occupant seat 3 from rattling and maintain the comfort of the occupant seated on the occupant seat 3 in a good state.

  Moreover, in the said embodiment, the sheet | seat support member 32 is No.2. 4 A displaceable lock member 37 is provided at an unlock position that allows displacement so as to get over the cross member 17 and a lock position that restricts the ride-over displacement, and forward / backward movement of the occupant seat 3 is restricted. Since the lock member 37 is driven to the unlocked position in conjunction with the unlocking operation of the lock mechanism 40 including the locking arm 40, the seat is used when the occupant performs the operation of moving the occupant seat 3 back and forth. The support member 32 can be automatically shifted to a displaceable state. Accordingly, as described above, No. 1 is projected so as to protrude above the floor surface of the passenger compartment. Even when the 4 cross member 17 is installed, when the occupant seat 3 is slid and displaced in the front-rear direction of the vehicle body without requiring a complicated operation, no. No. 4 by swinging and displacing the seat support member 32 so as to get over the cross member 17. The occupant seat 3 can be moved back and forth without being obstructed by the four cross members 17.

  In the above-described embodiment, the example in which the seat support member 32 is provided only on the front surface of the lower surface of the seat cushion 6 has been described in order to reduce the vehicle weight and the manufacturing cost as much as possible. Instead of this, a structure may be employed in which seat support members 32 are provided on both the front and rear sides of the lower and right side portions of the lower surface of the seat cushion 6, respectively. When configured in this manner, the comfort of the occupant seated on the occupant seat 3 can be effectively maintained by stably supporting the occupant seat 3 by the seat support member 32.

DESCRIPTION OF SYMBOLS 1 Floor panel 2 Middle row passenger seat 3 Rear row passenger seat 9 Wheel house 13 Seat rail 17 4 Cross member 19 Closed section 20 Lower frame 21 Floor trim material (floor surface)
22 Recessed part 23 Gap 24 Reinforcement member 27 Joining flange part (joining part)

Claims (6)

  A floor panel forming the bottom of the passenger compartment, a seat rail installed so as to extend in the longitudinal direction of the vehicle body along the floor panel, and an occupant seat supported so as to be movable back and forth along the seat rail; A cross member that extends in the vehicle width direction along the floor panel and protrudes upward from the floor surface of the passenger compartment, and is recessed downward near the center of the cross member in the vehicle width direction. A lower vehicle body structure for a vehicle, characterized in that a recessed portion is provided and the seat rail is installed so as to pass through the recessed portion.   2. The lower body structure of a vehicle according to claim 1, wherein a plurality of rows of occupant seats arranged in front and rear of the passenger compartment are slidably supported along the seat rail.   The lower body structure of a vehicle according to claim 1 or 2, wherein a lower frame forming a closed cross section extending in the vehicle width direction along the lower surface of the floor panel is provided below the cross member.   4. A gap is formed between the recessed portion of the cross member and the seat rail, and a reinforcing member is installed so as to cover the gap. Lower body structure of the vehicle.   The vehicle lower body structure according to claim 4, wherein the reinforcing member includes a joint portion joined to a side wall surface of the seat rail.   The said cross member is arrange | positioned so that between the left and right rear wheel houses installed so that it may bulge to the vehicle interior side may mutually be connected. Lower body structure of the vehicle.

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