JP2019059267A - Floor cross member structure of vehicle - Google Patents

Abstract

To ensure a space below a seat prior to a side impact, and further inhibit deformation of a vehicle in the event of the side impact.SOLUTION: A floor cross member structure 20 includes a pair of supports 23 and 24, an intermediate part 25, and a pair of ascending mechanisms 30 which are interposed between a side sill 14, which is disposed on a lateral part of an external side of a lower part of a vehicle body 11 in a vehicle width direction, and a floor tunnel 15 disposed in the center of the vehicle body 11 in the same direction. One of the supports 23 and 24 adjoins the side sill 14, and the other one adjoins the floor tunnel 15. The supports bear respective seat rails 17 of a seat 16 from below. Before a side impact is detected, the intermediate part 25 is located at a position where its upper surface 25a gets lower than the upper surfaces 23a and 24a of the respective supports 23 and 24. When the side impact is detected, the ascending mechanisms 30 cause the intermediate part 25 to ascend so that the height of the upper surface 25a gets equal to or lower than the height of the upper surfaces 23a and 24a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floor cross member structure of a vehicle provided between a side sill and a floor tunnel in a lower portion of a vehicle body to suppress deformation of the vehicle at the time of a side collision.

  A side sill extending in the front-rear direction is disposed immediately below the side door, which is a side portion on the vehicle outer side of the lower portion of the vehicle body in the vehicle width direction, as one of the strength members constituting the side opening of the vehicle. Further, a floor tunnel extending in the front-rear direction is disposed at a central portion of the lower portion of the vehicle body in the vehicle width direction.

Furthermore, a floor cross member extending in the vehicle width direction may be bridged between the side sill and the floor tunnel for the purpose of improving the rigidity and strength of the lower portion of the vehicle body.
When a collision body such as another vehicle collides from the side (a side collision) to a vehicle where such a floor cross member is applied to the lower part of the vehicle body, part of the load applied to the vehicle with the collision is a side sill and a floor cross It is transmitted to the floor tunnel through the members. The floor tunnel has high rigidity and restricts the inward movement of the floor cross member. Therefore, the load of the side collision applied to the side sill is received by the floor cross member restricted in the inward movement as described above. As a result, deformation of the vehicle is suppressed, a cabin space is secured, and a passenger is protected.

  As one form of the above-mentioned floor cross member, there is a thing provided with a pair of supporters and a general part. The pair of support portions are disposed at two locations separated from each other in the vehicle width direction, and each have an upper surface extending in the vehicle width direction. One of the two supports is adjacent to the side sill and the other is adjacent to the floor tunnel. Both supports respectively support the seat rails of the seat from below on their upper side. The general part is located at a position lower than the upper surface of the support part between the two support parts. The space between the general part and the seat is used as a space for the rear seat occupants to place their feet and to accommodate small items and the like.

  By devising the structure of the floor cross member having such a configuration, various structures have been considered in which a space can be secured under the seat before a side collision and the deformation of the vehicle can be further suppressed in the side collision.

  For example, in Patent Document 1, in the floor cross member, the portion on the side sill side relative to the support portion on the vehicle outer side is expanded to a position higher than the side sill. This extension is located inside the car below the side door. Therefore, the load applied to the side door due to the side collision is received by the extended portion, and the deformation of the vehicle is further suppressed.

  Further, in Patent Document 2, a reinforcing bead is formed on the ridge line portion of the support portion on the vehicle outer side in the floor cross member. The bead enhances the strength of the support portion on the outside of the vehicle and improves the performance of suppressing the deformation of the vehicle at the time of a side collision.

Japanese Patent Application Laid-Open No. 11-255154 Japanese Utility Model Application Publication 63-104287

  However, in the patent document 1, the support portion on the outside of the vehicle is located at a position lower than the extension portion. Therefore, when the load of the side collision is transmitted to the expanded portion, the floor cross member may be deformed at the step between the upper surface of the expanded portion and the upper surface of the support portion. Moreover, in the said patent document 2, a general part is located in the location lower than the upper surface of the support part of a vehicle outer side. Therefore, when the load of the side collision is transmitted to the support portion on the vehicle outer side, the floor cross member may be deformed at the step between the upper surface of the support portion on the vehicle outer side and the upper surface of the general portion. Therefore, in any of Patent Document 1 and Patent Document 2, it is possible to improve the performance of suppressing the deformation of the vehicle by making the floor cross member difficult to deform.

  The present invention has been made in view of such circumstances, and an object thereof is to secure a space under a seat before a side collision and to further suppress a deformation of the vehicle at the time of a side collision. The present invention is to provide a floor cross member structure.

  The floor cross member structure of the vehicle that solves the above problems is between the side sill disposed on the side outside the lower part of the vehicle body in the vehicle width direction and the floor tunnel disposed on the central part of the lower part of the vehicle body in the same direction. It is a floor cross member structure of a vehicle provided, which is disposed at two places separated from each other in the vehicle width direction, one adjacent to the side sill and the other adjacent to the floor tunnel and further extending in the vehicle width direction A pair of supports that support the seat rails of the seat from below at the top of the seat, and between the two supports before the side collision is detected or predicted. And an ascending machine for raising the height of the upper surface of the middle portion to be equal to or less than the height of the upper surfaces of the both supporting portions in accordance with the detection or prediction of the middle portion and the side collision. And a part.

  According to the above configuration, before the side collision is detected or predicted, the middle portion is not raised by the raising mechanism. The middle part is located between the two support parts at a position lower than the upper surface of the same support part. Therefore, a space is formed between the seat and the middle portion, and it is possible to place the rear passenger's foot, small objects, etc. here.

  When a collision body such as another vehicle collides with a vehicle from the side (side collision), part of the load applied to the vehicle due to the side collision is transmitted to the floor tunnel via the side sill and the floor cross member structure. Ru. The transmission of the load is mainly performed at the support portion at the upper portion having the upper surface extending in the vehicle width direction. The floor tunnel has high rigidity and regulates the inward movement of the floor cross member structure.

  On the other hand, when the side collision is detected or predicted, the middle portion is raised by the raising mechanism. Due to this rise, the upper surface of the intermediate portion approaches the upper surfaces of both support portions. The height difference between the top surface of the middle portion and the top surface of both supports is smaller than the height difference before the side collision is detected or predicted. Therefore, when the load applied to the vehicle due to the side collision is transmitted to the floor tunnel via the support on the outside of the floor cross member structure, the middle part and the support on the inside of the car, the middle part carries out the side collision The side impact load is received closer to the upper surface of the support to which the load is transmitted than before it is detected or predicted. Since the load is received by the intermediate portion, the support portion is less likely to be deformed inward as compared to before a side collision is detected or predicted, and a cabin space is secured.

  In the above-described floor cross member structure of a vehicle, the lifting mechanism portion extends or retracts in a direction along the upper surface of the intermediate portion according to detection or prediction of the side collision, and a direction of extension or contraction of the actuator It is preferable to provide a conversion transmission unit that vertically converts the same to transmit the same extension or contraction to the intermediate portion to ascend.

  According to the above configuration, when a side collision is detected or predicted, the actuator in the lifting mechanism extends or contracts in the direction along the upper surface of the middle portion. The extension or contraction of the actuator is converted by the conversion transmission unit up and down in the direction of extension or contraction and transmitted to the intermediate unit. Although it is such a simple structure, it is possible to raise the middle part so that the height of the upper surface thereof is equal to or less than the height of the upper surfaces of both the support parts.

  In the above-described floor cross member structure of a vehicle, the actuator includes a case, and a shaft protruding from the case in a direction along the upper surface of the intermediate portion according to detection or prediction of the side collision, and the conversion transmission The unit includes a lever supported by a shaft and coupled to the shaft, and raises the intermediate portion using rotation of the lever around the shaft along with the projecting operation of the shaft. Is preferred.

  According to the above configuration, when the side collision is detected or predicted, in the actuator, the shaft is protruded from the case in the direction along the upper surface of the middle portion. The protrusion causes the actuator to be extended. The projecting motion of the shaft is transmitted to a lever connected to the shaft, and the lever is pivoted about an axis. The pivoting of the lever is used to raise the middle part.

  In the above-described floor cross member structure of the vehicle, the shaft protrudes from the case in the vehicle width direction according to the detection or prediction of the side collision, and the shaft supporting the lever is in the front-rear direction of the vehicle Preferably, the conversion transmission unit includes a slider slidably provided in the vehicle width direction with respect to the intermediate portion, and the lever is coupled to the slider.

  According to the above configuration, when the shaft is protruded from the case in the vehicle width direction according to the detection or prediction of the side collision and the lever is rotated about an axis extending in the longitudinal direction of the vehicle, The connection with the slider pivots about an axis. With this turning, the position in the vehicle width direction of the connection portion of the lever with the slider and the position in the vertical direction change. Along with this change, the slider rises while sliding in the vehicle width direction with respect to the middle portion. As a result, the intermediate portion can be raised without moving in the vehicle width direction.

  In the above-described floor cross member structure of a vehicle, it is preferable that the intermediate portion has a guide hole extending in the vehicle width direction, and the slider includes a guide pin inserted in the guide hole.

  According to the above configuration, the guide pin in the slider is allowed to move in the same direction in the guide hole extending in the vehicle width direction with respect to the intermediate portion, and is restricted from moving in any other direction. . Through the movement of the guide pin along the guide hole, sliding of the slider in the vehicle width direction with respect to the intermediate portion is permitted. Therefore, when the shaft is protruded from the case in the vehicle width direction according to the detection or prediction of the side collision and the lever is pivoted, the slider ascends while sliding in the vehicle width direction with respect to the intermediate portion.

  In the above-mentioned floor cross member structure of a vehicle, the lever includes a long first arm and a long second arm inclined with respect to the first arm, and the first arm and The second arm portions are mutually connected at their end portions, and the axis is provided at a boundary between the first arm portion and the second arm portion, and the first arm portion is in a length direction from the axis Connected to the shaft at a point away from the shaft, the second arm is connected to the slider at a point away in the longitudinal direction from the axis, and the shaft is responsive to detection or prediction of the side collision When the lever is protruded and the lever is rotated, the first arm portion is positioned such that the connecting portion of the first arm portion with the shaft is located forward of the shaft in the protruding direction of the shaft. It is preferable to be in an inclined posture.

  According to the above configuration, when the shaft is protruded from the case according to the detection or prediction of the side collision and the lever is pivoted, the connection portion of the first arm with the shaft projects the shaft rather than the shaft. The first arm is inclined to be positioned forward in the direction. From this state, in order to retract the shaft, it is necessary to rotate the lever in the direction opposite to the above rotation direction to move the connecting portion of the first arm with the shaft toward the case side of the shaft. is there. However, the load of the middle part etc. is added to the lever. Therefore, it is difficult for the lever to pivot in the opposite direction. The shaft is held in the state of being protruded from the case, and the middle portion is held in the raised position.

  In the above-described floor cross member structure of a vehicle, the lifting mechanism portion is made uninflated at the lower side of the middle portion before the side collision is detected or predicted, and according to the detection or prediction of the side collision. An airbag for supplying an inflation gas and inflating it to raise the intermediate portion; and a plurality of locations under the intermediate portion, the intermediate portion being disposed before the side collision is detected or predicted It is preferable to provide a lying down state extending along the upper surface of the upper portion, and a standing post erected to intersect the upper surface of the middle portion when the side collision is detected or predicted.

  According to the above configuration, the airbag is uninflated below the middle portion before a side collision is detected or predicted. Therefore, the intermediate portion is not lifted by the air bag, and is located between the two support portions at a position lower than the upper surface of the same support portion. Also, at this time, the pedestal is in a lying down state extending along the upper surface of the middle portion. Therefore, the pedestal is unlikely to be an obstacle to the middle part being disposed at a position lower than the upper surfaces of the two support parts.

  On the other hand, when a side collision is detected or predicted, the air bag receives the supply of inflation gas and is inflated to raise the middle portion. Although it is such a simple structure, it is possible to raise the middle part so that the height of the upper surface thereof is equal to or less than the height of the upper surfaces of both the support parts. Also, at this time, the pedestal is erected so as to cross the upper surface of the middle portion. The upright pedestal restricts the middle section from being lowered from the raised position.

  In the above-mentioned floor cross member structure of the vehicle, each pillar is rotatably supported by the support shaft with respect to the intermediate portion, and for each pillar, the erected state from the fallen state with the support shaft as a fulcrum A biasing force is applied to turn the side to the side, and each pedestal is moved from the laid down state by the biasing force as the intermediate portion is lifted by the airbag according to the detection or prediction of the side collision. It is preferable to be switched to the standing state.

  According to the above configuration, the pedestal is laid down before the side collision is detected or predicted. When the air bag is inflated and the middle portion is raised according to the detection or prediction of the side collision, the pillar is switched from the laid state to the upright state by the rotational biasing force. Therefore, it is not necessary to use a special actuator for this switching or to control the actuator.

  In the above-described floor cross member structure of a vehicle, the upper surfaces of both support portions and the upper surface of the intermediate portion are formed by planes extending in the vehicle width direction, and the lifting mechanism portion responds to detection or prediction of the side collision. It is preferable that the intermediate portion is raised so that the upper surface of the intermediate portion is at the same height as the upper surfaces of both support portions.

Here, if there is a height difference (stepped portion) between the upper surface of the supporting portion and the upper surface of the middle portion, when a load of side collision is applied, the supporting portion tends to be deformed in the stepped portion.
In this respect, according to the above configuration, the middle portion is raised by the raising mechanism portion according to the detection or prediction of the side collision, and the upper surface of the middle portion is aligned with the same height as the upper surfaces of both support portions. The floor cross member structure is in a state where there is no step between the upper surfaces of the two support portions and the upper surface of the middle portion, or in a state close thereto. Therefore, when a load is applied to the vehicle from the side due to a side collision, the load is transmitted to the floor tunnel via the support portion and the intermediate portion whose heights of the upper surfaces are aligned. Therefore, the support portion is less likely to be deformed as compared to the case where the step portion is present between the upper surface of the support portion and the upper surface of the middle portion. As a result, deformation of the vehicle is effectively suppressed.

  According to the above-described floor cross member structure of the vehicle, it is possible to secure a space below the seat before the side collision and to further suppress the deformation of the vehicle at the time of the side collision.

In 1st Embodiment which applied the floor cross member structure of a vehicle to the vehicle body lower part, the fragmentary sectional view which shows this structure and its periphery part in 1st Embodiment. The fragmentary sectional view which expands and shows the floor cross member structure in FIG. FIG. 7 is a partial plan view showing the floor cross member structure at the lower part of the vehicle body and the periphery thereof in the first embodiment. FIG. 7 is a partial plan view showing the relationship between the guide hole of the middle portion (auxiliary plate portion) and the guide pin of the slider in the first embodiment. FIG. 7 is a partial cross-sectional view showing the state of the lifting mechanism before the actuator is actuated in the first embodiment. FIG. 6 is a partial cross-sectional view taken along line 6-6 in FIG. 5; FIG. 7 is a partial cross-sectional view showing the state of the lifting mechanism part during operation of the actuator in the first embodiment. FIG. 8 is a partial cross section taken along line 8-8 in FIG. 7; FIG. 7 is a partial cross-sectional view showing the state of the lifting mechanism when the actuator in the first embodiment completes its operation. FIG. 10 is a partial cross-sectional view along line 10-10 in FIG. 9; The fragmentary sectional view showing the state of the floor cross member structure before the rise mechanism part in a 2nd embodiment operates. The fragmentary sectional view showing the state of the floor cross member structure when the rise mechanism part in a 2nd embodiment completes operation.

First Embodiment
Hereinafter, a first embodiment in which a floor cross member structure of a vehicle is embodied will be described with reference to FIGS.

  In the following description, the forward direction of the vehicle is referred to as the front, and the reverse direction is referred to as the rear. Further, with the central portion in the vehicle width direction of the passenger compartment as a reference, the side closer to the central portion is referred to as “inward side”, and the side away from the central portion is referred to as “exterior side”.

  FIGS. 1 to 3 show the lower structure of the vehicle body 11 in the vehicle 10. The bottom of this substructure is constituted by the floor panel 12. A side sill 14 is one of the strength members constituting the side opening of the vehicle 10 immediately below the both side doors 13 (only one is shown in FIG. 1) on both sides of the floor panel 12 in the vehicle width direction. Each is arranged. Both side sills 14 extend in the front-rear direction of the vehicle 10. Further, a floor tunnel 15 (only a part of which is shown in FIGS. 1 and 3) extending in the front-rear direction is formed at the central portion of the floor panel 12 in the vehicle width direction. The floor tunnel 15 protrudes upward from the floor panel 12.

  Furthermore, floor cross member structures 20 are provided at a plurality of locations on the floor panel 12 for the purpose of improving the rigidity and strength of the vehicle body 11 or the like. The floor cross member structure 20 is provided at two places separated from each other in the front-rear direction below the driver's seat, and provided at two places separated from each other in the front-rear direction below the passenger seat. The pair of front and rear floor cross member structures 20 below the driver's seat and the pair of front and rear floor cross member structures 20 below the front passenger seat have the same configuration. However, the positional relationship between the components of the floor cross member structure 20 below the front passenger seat and the components of the floor cross member structure 20 below the driver's seat is axisymmetric with respect to the floor tunnel 15. In addition, when it is not necessary to distinguish a driver's seat and a front passenger seat, both shall be called "the seat 16." The respective seats 16 are mounted so as to be adjustable in the front-rear position with respect to a pair of seat rails 17 extending in the front-rear direction while being separated from each other in the vehicle width direction.

  A part of each floor cross member structure 20 is constituted by a floor cross member main body 21. Each floor cross member main body 21 has a configuration similar to that generally called a floor cross member. Each floor cross member main body 21 includes an elongated general portion 22 extending in the vehicle width direction, a support portion 23 adjacent to the outer side of the general portion 22, and a support portion 24 adjacent to the inner side of the general portion 22. Have. The upper surface 23a of each support portion 23 and the upper surface 24a of each support portion 24 are both formed by a flat surface, and are positioned at the same height. Both upper surfaces 23 a and 24 a are located at positions higher than the upper surface 22 a formed by a flat surface in the general portion 22.

  Each floor cross member main body 21 is bridged between the side sill 14 and the floor tunnel 15. The cross-sectional shape when each floor cross member main body 21 is cut along the front-rear direction has a hat shape.

The pair of support portions 23 and 24 of each floor cross member main body 21 has a function of supporting the seat rail 17 of each seat 16 from the lower side.
Each support 23 on the outside of the vehicle is adjacent to the side sill 14 on the inside of the vehicle, and each support 24 on the inside of the vehicle is adjacent to the floor tunnel 15. A flange portion (not shown) is formed at the peripheral edge of each floor cross member main body 21. In this flange portion, the floor cross member main body 21 is welded to the floor panel 12, side sill 14, floor tunnel 15, etc. Are joined by the fixing means of

Each floor cross member structure 20 includes an intermediate portion 25 and a pair of lifting mechanisms 30 in addition to the floor cross member main body 21.
As shown in FIGS. 4 to 6, each intermediate portion 25 includes an intermediate plate portion 26 and a pair of auxiliary plate portions 27 (see FIG. 2). The intermediate plate portion 26 has an elongated shape in which the dimension in the vehicle width direction is larger than the dimension in the front-rear direction. Assuming that each dimension of the general part 22, the support parts 23 and 24, and the intermediate plate part 26 in the front-rear direction is a width, each intermediate plate part 26 has a width similar to that of both the support parts 23 and 24 and the general part 22. (See Figure 3). The upper surface 25a of the intermediate plate portion 26 is constituted by a plane extending in the vehicle width direction.

  The pair of auxiliary plate portions 27 is fixed to both ends in the vehicle width direction below the respective intermediate plate portions 26. Each auxiliary plate 27 is formed with a pair of guide holes 28. Both guide holes 28 of each auxiliary plate 27 extend in the vehicle width direction while being separated from each other in the front-rear direction.

  Before each side collision is detected, each raising mechanism 30 holds the middle portion 25 at the initial position shown by a solid line in FIG. 5, and when the side collision is detected, the middle portion 25 is shown in FIG. In the above, it is a mechanism for moving to a raised position shown by a two-dot chain line. The initial position of the intermediate portion 25 is set at a position where the upper surface 25a of the intermediate portion 25 is lower than the upper surfaces 23a and 24a of both the support portions 23 and 24 (see FIG. 2). In the first embodiment, the initial position is set at a position where the upper surface 25 a is at an intermediate height between the upper surfaces 23 a and 24 a and the upper surface 22 a of the general portion 22. On the other hand, the elevation position is set at a position where the height difference between the upper surface 25a and the upper surfaces 23a and 24a is smaller than the height difference at the initial position. That is, the elevation position is set higher than the initial position. In the first embodiment, the rising position is set at a position where the upper surface 25a has a height equal to or close to the upper surfaces 23a and 24a.

As shown in FIGS. 9 and 10, each lifting mechanism unit 30 includes an actuator 31 and a conversion transmission unit 35.
As the actuator 31, one that extends in a direction along the upper surface 25 a of the intermediate portion 25 is used. In the first embodiment, the actuator 31 includes a case 32 which is disposed in a posture extending in the vehicle width direction and fixed to the general portion 22, and a shaft 33 which protrudes and retracts from the case 32 in the vehicle width direction. The one that extends to The pair of actuators 31 in the same floor cross member structure 20 are arranged such that the shafts 33 project from the case 32 in mutually opposite directions (directions toward the support portions 23 and 24) in the vehicle width direction ( See Figure 2).

  As such an actuator 31, for example, an electromagnetic solenoid configured to make the shaft 33 appear and retract with respect to the case 32 by converting electric energy into mechanical motion using an electromagnetic force can be used. The electromagnetic solenoid is provided with a spring (not shown) that biases the shaft 33 in a direction to retract the shaft 33 into the case 32. When the electromagnetic solenoid is deenergized by deenergizing the solenoid, the shaft 33 is pushed by a spring to be inserted into the case 32. On the other hand, the electromagnetic solenoid causes the shaft 33 to protrude from the case 32 against the spring when excited by energization. As described above, in the actuator 31, the shaft 33 is brought into and out of the case 32 in response to energization and de-energization of the electromagnetic solenoid.

At the tip of each shaft 33, a pin 34 extending in the front-rear direction is inserted. Both end portions in the front-rear direction of the pin 34 are exposed from the shaft 33.
Each conversion transmission unit 35 converts the direction of extension of the actuator 31 in the vertical direction, transmits the extension to the intermediate portion 25 and ascends, and includes a slider 36 and a lever 40.

  Each slider 36 is mounted slidably on the auxiliary plate 27 in the vehicle width direction. Each slider 36 is configured to include a main body plate portion 37, a pair of guide pins 38, and a pair of support pieces 39. The main body plate portion 37 is disposed in a state of being overlaid below the auxiliary plate portion 27. Both guide pins 38 have a cylindrical shape formed to have a diameter slightly smaller than the dimension (width) of the guide holes 28 in the front-rear direction. The two guide pins 38 project upward from the main body plate 37 in a state of being separated from each other in the front-rear direction, and are inserted into the corresponding guide holes 28. The two support pieces 39 project downward from locations separated from each other in the front-rear direction of the main body plate portion 37.

  Each lever 40 has a pair of elongated first arms 41, a single elongated second arm 42 inclined at an obtuse angle with respect to both first arms 41, and both levers 40. A connecting portion 43 connecting the first arm 41 and the second arm 42 is provided. The connecting portion 43 has a cylindrical shape extending in the front-rear direction. Both first arm portions 41 extend radially outward from both end portions in the front-rear direction of the connecting portion 43. The second arm portion 42 extends from an intermediate portion in the front-rear direction of the connecting portion 43 in a direction different from the first arm portions 41 in the radial direction of the connecting portion 43. One end of each first arm 41 and one end of the second arm 42 are connected to each other through a connecting portion 43.

  A shaft 44 extending in the front-rear direction is rotatably inserted into the connecting portion 43. The shaft 44 is fixed to other members such as the floor panel 12 and the floor cross member main body 21 so that the positional relationship with the case 32 does not change regardless of the presence or absence of a side collision.

  In both first arm portions 41, long holes 46 extending in the same direction are respectively formed at positions separated from the shaft 44 in the length direction of the first arm portions 41. The distal end portion of the shaft 33 is disposed between the two first arm portions 41, and both end portions of the pin 34 are inserted into the long holes 46 of the first arm portions 41. The pin 34 connects the first arms 41 to the tip of the shaft 33 at a position away from the shaft 44 in the longitudinal direction.

  In the second arm portion 42, a portion separated from the shaft 44 in the length direction of the second arm portion 42. In the first embodiment, the second arm portion 42 is in the length direction and opposite to the shaft 44. The side end is disposed between the two support pieces 39 of the slider 36. And the pin 47 extended in the front-back direction with respect to both the support piece 39 and the said edge part of the 2nd arm part 42 is penetrated. The end of the second arm 42 is connected to the two support pieces 39 by the pin 47.

  When the shaft 33 is maximally protruded and the lever 40 completes pivoting as shown in FIG. 9, the connecting portion (pin 34) of each first arm 41 with the shaft 33 is the shaft 44. Each first arm 41 is inclined toward the case 32 as it approaches the upper side so as to be positioned forward of the shaft 33 in the projecting direction.

  The floor cross member structure 20 further includes a collision sensor 51 and a controller 52 shown in FIG. One combination of the collision sensor 51 and the control device 52 is provided on the vehicle body 11 as being common to the four floor cross member structures 20. The collision sensor 51 detects a side collision when a collision body such as another vehicle collides with the vehicle 10 from the side (side collision). The controller 52 controls the operation of all the actuators 31 based on the signal from the collision sensor 51.

Next, the operation and effects of the first embodiment configured as described above will be described.
5 to 10 show the operation of the ascent mechanism 30 on the vehicle outer side in each floor cross member structure 20. FIG. Although the operation of the lifting mechanism 30 on the inside of the vehicle is not shown and described, the components of the lifting mechanism 30 on the inside of the vehicle perform the same operations as the components of the lifting mechanism 30 on the outside of the vehicle. However, there is a case in which each component of the raising mechanism 30 on the inside of the vehicle operates in a direction different from the component of the raising mechanism 30 on the outside of the vehicle.

  The controller 52 monitors whether a side collision has been detected by the collision sensor 51. When the side collision is not detected by the collision sensor 51, the controller 52 stops the energization of the actuator 31. When the electromagnetic solenoid is de-energized by this de-energization, as shown in FIGS. 5 and 6, most of the shaft 33 pressed by the spring continues to be retracted into the case 32. The pin 34 at the tip of the shaft 33 is located at the lower end of the elongated hole 46 in both first arm portions 41. The pin 34 is positioned closer to the case 32 than the shaft 44, and both first arm portions 41 are inclined so as to be lower toward the pin 34 (closer to the vehicle interior). The pin 47 of the second arm 42 is closest to the nearest support 23 at the same or close height to the axis 44. Both guide pins 38 of each slider 36 are located at the end closer to the nearest support 23 in the guide hole 28.

  The middle portion 25 is not lifted by the lifting mechanism portions 30 and each middle portion 25 is held at the initial position. In the initial position, the upper surface 25a of each intermediate portion 25 is located at a position lower than the upper surfaces 23a and 24a between the support portions 23 and 24 (see FIG. 2). Therefore, a space S1 having a size, in particular a height, is formed between each seat 16 and each middle portion 25 such that the rear passenger's foot can be placed or small items etc can be placed. .

  When a collision body such as another vehicle collides with the vehicle 10 from the side (side collision), part of the load applied to the vehicle 10 by the side collision is a floor tunnel via the side sill 14 and the floor cross member main body 21. 15 (see FIG. 1). The transmission of the load is mainly performed at the upper portions of the support portions 23 and 24 having the upper surfaces 23 a and 24 a extending in the vehicle width direction. The floor tunnel 15 has high rigidity, and restricts the movement of the floor cross member main body 21 to the inside of the vehicle.

  On the other hand, when a side collision is detected by the collision sensor 51, the control device 52 sets all the (four) actuators 31 on the side to which the load of the side collision is applied in the vehicle width direction with the floor tunnel 15 as a boundary. Power is supplied (see FIG. 3). When the electromagnetic solenoid for each actuator 31 is excited by this energization, the shaft 33 is projected from the case 32 toward the nearest support portion 23 or 24 in the vehicle width direction against the spring. Is extended in the vehicle width direction. The extension of each actuator 31 is converted by the conversion transmission unit 35 into the up and down direction of the extension direction and transmitted to the intermediate unit 25.

  For example, in the actuator 31 on the outside of the vehicle, as shown in FIGS. 5 and 6, the projecting motion of each shaft 33 is transmitted to both first arm portions 41 of each lever 40 via the pin 34 and the long hole 46. Ru. Therefore, toward the side where each first arm 41 approaches the nearest support 23 and the second arm 42 moves away from the support 23 (clockwise direction in FIG. 5) with the shaft 44 as the fulcrum. It is turned. At this time, each pin 34 moves in the long hole 46 in each first arm 41. As the position in the long hole 46 of the pin 34 changes, the lever 40 pivots about the shaft 44.

  The pivoting of each lever 40 is used to raise the intermediate portion 25. That is, as the levers 40 rotate, the pins 47 pivot about the shafts 44. With this turning, the position of each pin 47 in the vehicle width direction and the position in the vertical direction change.

  Here, the pair of guide pins 38 in each slider 36 is allowed to move only in the vehicle width direction in the pair of guide holes 28 in the intermediate portion 25 (auxiliary plate portion 27), and moves in the other direction. Be regulated. Through the movement of both guide pins 38 in both guide holes 28, sliding of the slider 36 in the vehicle width direction with respect to the intermediate portion 25 is permitted.

  Therefore, when the shaft 33 is protruded from the case 32 in the vehicle width direction in response to the detection of the side collision and the lever 40 is pivoted about the shaft 44, the slider 36 is in the vehicle width direction with respect to the intermediate portion 25. While sliding to the side away from the nearest support part 23, ascends. Both guide pins 38 move from the end on the support 23 side of the guide hole 28 in the vehicle width direction to an intermediate portion. As a result, the intermediate portion 25 is raised without moving in the vehicle width direction. The upper surface 25a of the intermediate portion 25 approaches the upper surfaces 23a and 24a of both the support portions 23 and 24 by this rise.

  7 and 8 show a state in which each lever 40 is pivoted by the respective shafts 33 projecting from the respective cases 32 until the respective pins 34 are positioned below the respective shafts 44. Both the first arm portions 41 are in the vertical state, and accordingly, the long holes 46 of the first arm portions 41 are also in the vertical state below the shaft 44, and the pins 34 are positioned at the upper end portions of the long holes 46. . Further, the second arm portion 42 approaches the support portion 23 when the expression is changed such that the pin 47 is positioned higher than the shaft 44 and closer to the support portion 23 due to the rotation of each lever 40. It becomes inclining state so that it becomes high according to. Each pin 47 is located at a position higher than the position when the intermediate portion 25 is in the initial position, and further away from the support portion 23. Both guide pins 38 are located at an intermediate portion in the longitudinal direction (vehicle width direction) of both guide holes 28. The upper surface 25 a of the intermediate portion 25 is located at an intermediate height between the initial position and the upper surfaces 23 a and 24 a of the support portions 23 and 24. The position of the intermediate portion 25 at this time is referred to as an intermediate position.

  In FIGS. 9 and 10, each lever 40 is further rotated by each shaft 33 protruding from each case 32 to a point where each pin 34 is closer to the nearest support 23 than below each shaft 44. Shows the condition being Both first arm portions 41 are inclined so as to approach the nearest support portion 23 toward the lower side. Each pin 34 is located at the lower end of both slots 46. Further, due to the rotation of each lever 40, each second arm 42 is in a vertical state in which each pin 47 is positioned above each shaft 44. As both guide pins 38 move to the end of the both guide holes 28 on the side far from the nearest support portion 23, each pin 47 is higher than the position when the intermediate portion 25 is at the intermediate position, Moreover, it is located at a position further away from the support portion 23. Each intermediate portion 25 is moved to the raised position. In the raised position, the upper surface 25a of each middle portion 25 is positioned at the same height as the upper surfaces 23a and 24a of the support portions 23 and 24 or a height close thereto.

  Although it is such a simple configuration, the difference in height between the upper surface 25a of the intermediate portion 25 and the upper surfaces 23a and 24a of the support portions 23 and 24 is smaller than the difference in height before a side collision is detected (0 or It becomes almost 0). Therefore, when the load applied to the vehicle 10 due to the side collision is transmitted to the floor tunnel 15 via the side sill 14, the support 23 on the vehicle outer side, the intermediate portion 25 and the support 24 on the vehicle inner side in the floor cross member structure 20, The intermediate portion 25 receives the load at a position closer to the upper surface 23a of the support portion 23 to which the load of the side collision is transmitted than before the side collision is detected. Therefore, since the load is received by the intermediate portion 25, the support portions 23, 24 are less likely to be deformed inwards than before the side collision is detected. As a result, the deformation of the vehicle 10 can be suppressed, and the cabin space can be secured.

Here, if there is a height difference (stepped portion) between the upper surface 25a and the upper surfaces 23a and 24a, when a load of side collision is applied, the supporting portions 23 and 24 tend to deform at the stepped portion.
In this respect, in the first embodiment, when the side collision is detected, the intermediate portions 25 are raised by the raising mechanism 30, so that the upper surface 25a is aligned with the same height as the upper surfaces 23a and 24a. Each floor cross member structure 20 is in a state where there is no step between the upper surface 25a of the intermediate portion 25 and the upper surfaces 23a and 24a of the support portions 23 and 24 or in a state close thereto. Therefore, when a load is applied to the vehicle 10 from the side due to a side collision, the load is applied to the floor tunnel 15 via the support portions 23 and 24 and the middle portion 25 where the heights of the upper surfaces 23a, 24a and 25a are equalized. It is transmitted. Therefore, the supporting portions 23 and 24 are less likely to be deformed as compared with the case where there is a step between the upper surfaces 23 a and 24 a of the supporting portions 23 and 24 and the upper surface 25 a of the middle portion 25. As a result, the deformation of the vehicle 10 can be effectively suppressed.

  When each shaft 33 is protruded from each case 32 and each lever 40 is rotated as described above in response to the detection of a side collision, a connection portion (pins with the shafts 33 of both first arm portions 41) The first arm portion 41 is inclined such that 34) is positioned forward of each shaft 44 in the projecting direction of the shaft 33. From this state, in order to retract each shaft 33, it is necessary to rotate each lever 40 in the direction opposite to the rotation direction so as to move each pin 34 to the case 32 side than each shaft 44. is there. However, the load of the intermediate portion 25 or the like is applied to each lever 40 via the second arm portion 42. Therefore, it is difficult for the lever 40 to pivot in the opposite direction. Each shaft 33 is held in a state of being protruded from each case 32, and each middle portion 25 is held in a raised position.

Second Embodiment
Next, a second embodiment of the floor cross member structure 20 of the vehicle 10 will be described with reference to FIGS. 11 and 12.

In the second embodiment, a lift mechanism portion 60 having a configuration different from that of the lift mechanism portion 30 in the first embodiment is employed.
Specifically, the lifting mechanism 60 for each floor cross member structure 20 includes an air bag 61, a gas generator 62, and a pair of pedestals 63. Before the side collision is detected, the air bag 61 is uninflated as shown in FIG.

  The gas generator 62 has an elongated shape, and has a gas injection portion 62a at one end thereof. Although a gas generating agent (not shown) for generating an expansion gas is accommodated in the gas generator 62, a high pressure expansion gas may be filled instead of the gas generating agent. The whole of the gas generator 62 is preferably disposed inside the airbag 61, but only a part including the gas ejection part 62a is disposed inside the airbag 61, and the remaining part is the exterior of the airbag 61 It may be located at

  The two pillars 63 are disposed at a plurality of locations below the middle portion 25, in the second embodiment, at both ends of the middle portion 25 in the vehicle width direction. The two pillars 63 are attached to the intermediate portion 25 by hinges 65, respectively. Each pedestal 63 is rotatably supported by a support shaft 64 extending in the front-rear direction at a hinge 65 with respect to the intermediate portion 25. As shown in FIG. 11, each pedestal 63 is in a collapsed state extending in the vehicle width direction in the direction along the upper surface 25a of the middle portion 25 before a side collision is detected. Each side pillar 63 is in the upright state orthogonal to the upper surface 25a of the middle portion 25 when a side collision is detected, as shown in FIG.

  An urging member (not shown) such as a torsion coil spring is attached to each support shaft 64, and with this support member, each leg 63 is erected from the above-mentioned folded state with the support shaft 64 as a fulcrum. It is biased to turn to the Each pillar 63 is put in a lying down state before a side collision is detected, and is placed by a turning biasing force of a biasing member as the intermediate portion 25 is raised by the air bag 61 according to the detection of a side collision. Is switched to the standing state.

The target controlled by the controller 52 based on the signal from the collision sensor 51 is changed from the actuator 31 to the gas generator 62.
In addition, the raising mechanism part 60 is provided with the control part (not shown) which controls that both the pillars 63 rotationally urged by the biasing member turn beyond the standing state. Further, the lifting mechanism portion 60 is provided with a regulating portion (not shown) for regulating the middle portion 25 from rising to a position higher than the upper surfaces 23a, 24a of the support portions 23, 24.

The configuration other than the above is the same as that of the first embodiment. Therefore, the same components as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.
Next, the operation and effects of the second embodiment will be described.

  If a side collision is not detected by the collision sensor 51, the controller 52 does not output a signal for operating the gas generator 62. As shown in FIG. 11, the inflation gas is not jetted from the gas jet portion 62 a of the gas generator 62, and the air bag 61 is in a non-inflated state. Therefore, the intermediate portion 25 is not lifted by the air bag 61 and is held at the initial position. In the initial position, the intermediate portion 25 is located between the support portions 23 and 24 at a position where the upper surface 25a is lower than the upper surfaces 23a and 24a, and a space S1 is secured below the seat 16. Further, at this time, both the pillars 63 are in the laid down state extending in the vehicle width direction in the direction along the upper surface 25 a of the intermediate portion 25. Therefore, both the pillars 63 are unlikely to be an obstacle to the arrangement of the upper surface 25a of the middle portion 25 at a position lower than the upper surfaces 23a and 24a.

  On the other hand, when a side collision is detected by the collision sensor 51, the control device 52 outputs a signal for operating the gas generator 62, as shown in FIG. In accordance with this signal, the inflation gas is jetted from the gas jetting unit 62 a of the gas generator 62 and is supplied to the air bag 61. The inflation gas inflates the air bag 61 to push up the middle portion 25. The middle portion 25 rises to the rising position. However, an excessive rise beyond the rising position of the middle part 25 is restricted by the restriction part (not shown). Even with such a simple configuration, the intermediate portion 25 can be raised so that the height of the upper surface 25a is equal to or less than the height of the upper surfaces 23a and 24a of the support portions 23 and 24.

  Further, at this time, each of the pillars 63 is switched from the laid state to the upright state in conjunction with the expansion of the air bag 61 and the ascent of the intermediate portion 25 by the turning biasing force of the biasing member. Therefore, it is not necessary to use a special actuator or control the actuator for this switching. Then, by the two leg posts 63 in the upright state, the intermediate portion 25 is restricted from being lowered from the raised position.

According to the second embodiment, the following effects can be obtained in addition to the above.
Inflating gas is supplied from the gas generator 62 to the air bag 61 to inflate it, and the intermediate portion 25 is lifted from the initial position to the raised position. Therefore, as compared with the case where the intermediate portion 25 is raised using another type (for example, an electromagnetic type) as a drive source, quick drive is possible. In addition, the gas generator 62 has the advantages of low cost and high operation reliability.

In addition, each embodiment mentioned above can also be implemented as a modification which changed this as follows.
<Items concerning the first embodiment>
-Each actuator 31 may extend or contract in a direction different from the vehicle width direction among the directions along the upper surface 25a of the intermediate portion 25.

The actuators 31 may be contracted instead of those extending in the direction along the upper surface 25 a of the intermediate portion 25.
In addition, as the actuator 31, one that causes the shaft 33 to protrude and retract with respect to the case 32 using oil pressure or air pressure may be used.

  Further, as the actuator 31, a pyrotechnic gas generator may be used. The actuator 31 of this type ignites and burns the built-in explosive according to an operation signal from the control device 52 to generate an expansion gas. The actuator 31 is actuated by the expansion gas to extend or contract in the direction along the upper surface 25 a of the intermediate portion 25.

The auxiliary plate 27 may be omitted, and the guide hole 28 may be provided directly in the intermediate plate 26.
The number of guide holes 28 in each auxiliary plate 27 may be changed to one or three or more.
<Items concerning the second embodiment>
-Each leg 63 may be made into the attitude | position extended in the direction different from the vehicle width direction among the directions in alignment with the upper surface 25a of the intermediate part 25 at the time of a fall state.

-Three or more pedestals 63 may be used for one middle part 25.
-When the middle part 25 is raised, a state in which each pedestal 63 intersects with the upper surface 25a of the middle part 25 in a form different from orthogonal may be set up.

-Each pedestal 63 may be switched from the laid state to the upright state by the actuator instead of the biasing member.
<Matters Common to First and Second Embodiments>
If the side collision is predicted instead of the detection, the lifting mechanism 30, 60 may be operated to raise the middle portion 25.

For example, a collision prediction sensor (precrash sensor) that predicts a side collision may be used as the detection device.
In this case, the control device 52 predicts a side collision if the probability of the side collision exceeds a preset threshold value based on the detection signal of the collision prediction sensor.

  DESCRIPTION OF SYMBOLS 10 Vehicle 11 vehicle body 14 side sill 15 floor tunnel 16 seat 17 seat rail 20 floor cross member structure 22a, 23a, 24a, 25a top surface 23, 24 support portion Reference Signs List 25 intermediate part 28 guide hole 30, 60 lift mechanism part 31 actuator 32 case 33 shaft 35 conversion conversion part 36 slider 38 guide pin 40 lever 41 ... 1st arm, 42 ... 2nd arm, 44 ... axis, 61 ... air bag, 63 ... pillars, 64 ... spindle, S1 ... space.

Claims (9)

A floor cross member structure of a vehicle provided between a side sill disposed on an outer side of a lower portion of a vehicle body in a vehicle width direction and a floor tunnel disposed on a central portion of the lower portion of the vehicle body in the same direction.
They are arranged at two locations apart from each other in the vehicle width direction, one is adjacent to the side sill, the other is adjacent to the floor tunnel, and further, the upper surface of the seat extends from the lower side to the seat rail of the seat. A pair of support parts to support,
Before the side collision is detected or predicted, an intermediate portion disposed between the two support portions lower than the upper surface of the same support portion;
A floor cross member for a vehicle, comprising: an elevation mechanism portion that raises the middle portion so that the height of the upper surface of the middle portion is less than or equal to the height of the upper surfaces of both support portions according to detection or prediction of the side collision Construction. The elevation mechanism unit is
An actuator that extends or retracts in a direction along the top surface of the intermediate portion in response to the detection or prediction of the side collision;
The floor cross member structure of a vehicle according to claim 1, further comprising: a conversion transmission unit configured to convert the direction of extension or contraction of the actuator in the vertical direction and to transmit the extension or contraction to the intermediate portion to ascend. The actuator includes a case, and a shaft protruding from the case in a direction along the upper surface of the intermediate portion in response to detection or prediction of the side collision,
The conversion transmission unit includes a lever supported by a shaft and coupled to the shaft, and raises the intermediate portion using rotation of the lever around the shaft along with the projecting operation of the shaft. The floor cross member structure of a vehicle according to claim 2, The shaft projects in the vehicle width direction from the case in response to detection or prediction of the side collision.
The shaft supporting the lever extends in the longitudinal direction of the vehicle,
The conversion transmission unit includes a slider provided slidably in the vehicle width direction with respect to the intermediate portion,
The vehicle floor cross member structure according to claim 3, wherein the lever is connected to the slider. The intermediate portion has a guide hole extending in the vehicle width direction.
The vehicle floor cross member structure according to claim 4, wherein the slider comprises a guide pin inserted into the guide hole. The lever includes an elongated first arm and an elongated second arm which is inclined with respect to the first arm.
The first arm and the second arm are mutually connected at their ends,
The shaft is provided at a boundary between the first arm and the second arm,
The first arm portion is connected to the shaft at a position separated in the length direction from the axis,
The second arm portion is connected to the slider at a position separated in the length direction from the axis,
When the shaft is protruded and the lever is rotated according to the detection or prediction of the side collision, the connecting portion of the first arm with the shaft protrudes in the same direction as the shaft. The floor cross member structure of a vehicle according to claim 4 or 5, wherein the first arm is in an inclined posture so as to be located forward. The elevation mechanism unit is
Before the side collision is detected or predicted, the middle portion is uninflated under the middle portion, and according to the side collision detection or prediction, the expansion gas is supplied and expanded to expand the middle portion. With an air bag to raise
The lower part of the middle part is disposed at a plurality of places, and before the side collision is detected or predicted, it is put into a lying down state extending along the upper surface of the middle part, and the side collision is detected or predicted The floor cross member structure of a vehicle according to claim 1, further comprising: an erected pedestal that intersects the upper surface of the intermediate portion. Each pedestal is rotatably supported by the support shaft with respect to the intermediate portion,
An urging force is applied to each of the pillars about the support shaft as a fulcrum to move it from the laid down state to the upset state,
The vehicle floor according to claim 7, wherein each pedestal is switched from the laid state to the erected state by the biasing force as the intermediate portion is raised by the airbag according to the detection or prediction of the side collision. Cross member structure. The upper surfaces of the two support portions and the upper surface of the middle portion are formed by planes extending in the vehicle width direction,
The raising mechanism portion raises the middle portion such that the upper surface of the middle portion is at the same height as the upper surfaces of the both supporting portions in accordance with the detection or prediction of the side collision. Vehicle floor cross member structure according to any one of the preceding claims.