JP2015110354A - Occupant protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an occupant protection device capable of suppressing the folding deformation of a roll bar when inputting a load, while keeping the size of a residential space of an occupant.SOLUTION: An occupant protection device is equipped with a roll bar 7 arranged on a back surface side of a seat 5. A base portion 8 of the roll bar 7 has a first bending portion 20 bending to either one side in a vehicle fore-and-aft direction toward a vehicle upper side, and a second bending portion 22 formed higher than the first bending portion 20 of the vehicle and bending to the other side in the vehicle fore-and-aft direction toward the vehicle upper side. The base portion 8 has a tilting portion 21 formed between the first bending portion 20 and the second bending portion 22, and extending while tilting to the one side toward the vehicle upper side. On the one side rather than the tilting portion 21, an auxiliary bracket 24 having a load receiving portion 23 opposite to a vehicle body floor 4 at an interval is arranged on the base portion 8.

Description

  The present invention relates to an occupant protection device.

  Conventionally, a vehicle including a roll bar that protects an occupant when the vehicle rolls over is known. Some of these roll bars have a bent portion in the middle of the vehicle in the vertical direction in order to efficiently secure a passenger's living space. For this reason, when a load is input to the roll bar when the vehicle rolls over, the input load may be concentrated on the bent portion of the roll bar, and the roll bar may be easily bent and deformed.

  Therefore, in patent document 1, the intensity | strength of the whole roll bar is improved by attaching another flame | frame part to the main flame | frame part in a roll bar.

JP 7-277119 A

  However, the roll bar described in Patent Document 1 has a problem that the space occupied by the occupant decreases because the space occupied by the roll bar increases by adding another frame portion.

  Then, an object of this invention is to provide the passenger | crew protection apparatus which can suppress the bending deformation of a roll bar at the time of load input, maintaining the magnitude | size of a passenger | crew's living space.

  In the occupant protection device according to the present invention, a roll bar is provided on the back side of the seat. The base portion of the roll bar is bent to one side of the vehicle front-rear direction as it goes upwards of the vehicle, and extends from the first bent portion toward the upper side of the vehicle. And an inclined portion extending inclined to one side. Furthermore, the base portion has a second bent portion that is formed on the upper portion of the inclined portion and bends to the other side in the vehicle front-rear direction as it goes upward of the vehicle. An auxiliary bracket having a load receiving portion facing the vehicle body floor with a gap is disposed on the one side of the inclined portion.

  The occupant protection device according to the present invention has an effect that the roll bar can be prevented from being deformed at the time of load input while maintaining the size of the occupant's living space.

It is the perspective view which looked at the driver's seat vicinity inside the vehicle by the embodiment of the present invention from the vehicles back side. It is the perspective view which looked at the roll bar from the vehicle back side. It is the perspective view which looked at the roll bar from the vehicle front side. It is a side view of a roll bar. It is a front view of a roll bar. It is the sectional view on the AA line of FIG. It is a graph which shows the reaction force of a roll bar at the time of the load input to a roll bar.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the arrow FR indicates the front of the vehicle, and the arrow UPR indicates the upper side of the vehicle.

  As shown in FIG. 1, a pair of roof side rails 1, 1 extending along the vehicle front-rear direction are disposed on the left and right sides of the upper part of the vehicle body. The roof side rail 1 is a rigid vehicle body skeleton member, and an upper end portion of a pillar 2 extending in the vehicle vertical direction is joined to the roof side rail 1. Between the left and right roof side rails 1 and 1, a roof panel 3 that constitutes a roof portion at the top of the vehicle body is disposed. Specifically, the roof side rail 1 has a closed cross-sectional structure including a roof side rail inner 1a and a roof side rail outer 1b. The pillar 2 is constituted by a pillar inner 2a and a pillar outer 2b in a closed cross-sectional structure. The roof panel 3 is provided with a plurality of beads 3a extending along the vehicle front-rear direction.

  A bulkhead 4 (see FIG. 6) for partitioning the vehicle compartment and the engine room is disposed on the floor portion at the bottom of the vehicle body. A driver's seat 5 and a passenger seat (not shown) are disposed on the upper surface 4a of the bulkhead 4, and a carpet 6 is interposed between the bulkhead 4, the driver's seat 5 and the passenger seat. . The carpet 6 is composed of three layers: a relatively soft surface layer, an intermediate layer having a relatively high elasticity, and a relatively hard back layer.

  The driver's seat 5 mainly includes a seat cushion 5a that forms a seat surface of the seat, and a seat back 5b that is connected to the vehicle rear end portion of the seat cushion 5a and forms a seat back. A headrest 5c that supports the head of the occupant is integrally provided on the upper portion of the seat back 5b. The headrest 5c may be provided separately from the seat back 5b, and the headrest 5c may not be provided on the seat back 5b.

  A roll bar 7 is disposed on the back side of the driver's seat 5 (in the present embodiment, behind the vehicle) to protect the occupant when the vehicle rolls over. The roll bar 7 is extended toward the upper side of the vehicle from a base portion 8 fixed to the bulkhead 4 which is a part of the vehicle body floor, to a height near the upper end of the seat back 5b of the driver seat 5 from the base portion 8. Main body 9. In the present embodiment, the roll bar 7 and the roof side rail 1 are connected by a connecting bracket 10. The connecting bracket 10 includes a roll bar side bracket 10 a attached to the main body 9 of the roll bar 7 and a roof side rail side bracket 10 b attached to the roof side rail inner 1 a of the roof side rail 1. . Further, a Z-shaped bracket 11 is interposed between the roof side rail inner 1a and the roof side rail outer 1b where the roof side rail side bracket 10b is mounted on the roof side rail 1.

  As shown in FIG. 2 to FIG. 5, the roll bar 7 is disposed in a pair with a gap in the vehicle width direction, and is bent so as to be convex upwardly of the vertical pipes 12 and 13 extending in the vehicle vertical direction. And a curved pipe 14 that connects the upper ends of the left and right vertical pipes 12, 13. In addition, the roll bar 7 is arranged at intervals in the vehicle vertical direction and extends in the vehicle width direction to connect the left and right vertical pipes 12, 13 to each other (three in this embodiment) horizontal pipes 15. Have Further, an upper plate 16 is bridged between the left and right vertical pipes 12, 13 and the horizontal pipe 15 on the upper portion (main body portion 9) of the roll bar 7. A lower plate 17 is bridged between the left and right vertical pipes 12, 13 and the horizontal pipe 15 at the lower part (base part 8) of the roll bar 7.

  In the present embodiment, the lower end of the vertical pipe 12 on the inner side in the vehicle width direction of the roll bar 7 is sandwiched between the lower plate 17 and the back surface 4b of the bulkhead 4, and the vertical pipe 13 on the outer side in the vehicle width direction. Is opposed to the upper surface 4a of the bulkhead 4 with a gap C1. The upper plate 16 and the lower plate 17 are joined to the left and right vertical pipes 12 and 13 and the horizontal pipe 15 by welding. Such a roll bar 7 is attached to the back surface 4b of the bulkhead 4 by a lower plate 17 using bolts 18 and nuts 19 (see FIG. 6).

  As shown in FIG. 6, the base portion 8 of the roll bar 7 has a first bent portion 20 that bends toward the vehicle front side toward the vehicle upper side, and extends from the first bent portion 20 toward the vehicle upper side. And an inclined portion 21 that extends toward the front side of the vehicle as it goes upward. Further, the base portion 8 of the roll bar 7 has a second bent portion 22 that is formed on the upper portion of the inclined portion 21 and bends toward the vehicle rear side as it goes upward of the vehicle. In the present embodiment, the first bent portion 20 and the inclined portion 21 are formed on the vehicle upper side of the flattened portion of the roll bar 7 by crushing the lower end portion of the longitudinal pipe 12 on the inner side in the vehicle width direction into a flat plate shape. doing. That is, the first bent portion 20 of the base portion 8 has a shape in which the vehicle front side surface of the vertical pipe 12 on the inner side in the vehicle width direction is recessed toward the vehicle rear side. In addition, in FIG. 6, the code | symbol CL shows the centerline of the vertical pipe 12 inside a vehicle width direction.

  Further, an auxiliary bracket 24 having a load receiving portion 23 facing the upper surface 4 a of the bulkhead 4 with a distance C <b> 2 is disposed on the base portion 8 of the roll bar 7 on the vehicle front side with respect to the inclined portion 21. An interval C2 between the load receiving portion 23 and the upper surface 4a of the bulkhead 4 is smaller than an interval C1 between the lower end portion of the vertical pipe 13 on the outer side in the vehicle width direction and the upper surface 4a of the bulkhead 4, and is about 10 mm, for example. Specifically, the auxiliary bracket 24 includes a fixing portion 25 that is fixed to the longitudinal pipe 12 and the lower plate 17 on the inner side in the vehicle width direction, an extension portion 26 that extends downward from the fixing portion 25 toward the vehicle, And a load receiving portion 23 formed at the lower end of the extending portion 26. In order to prevent the deformation of the first bent portion 20 and the second bent portion 22 from being restrained, the fixed portion 25 has a longitudinal pipe 12 and a lower plate on the inner side in the vehicle width direction above the second bent portion 22 in the vehicle width direction. 17 is fixed. The extending part 26 has a cover part 27 that covers the first bent part 20, the inclined part 21, and the second bent part 22 from the vehicle front side so as not to be exposed to the outside. The load receiving portion 23 is formed in a flat plate shape and has a flat surface 23 a that faces the upper surface 4 a of the bulkhead 4.

  Below, the effect by this embodiment is demonstrated.

  (1) The occupant protection device according to the present embodiment includes a roll bar 7 disposed on the back side of a seat (in the present embodiment, a driver's seat 5). The roll bar 7 includes a base portion 8 that is fixed to the vehicle body floor, and a main body portion 9 that extends from the base portion 8 to a height near the upper end of the seat back 5b of the driver's seat 5 toward the upper side of the vehicle. The base portion 8 extends toward the upper side of the vehicle from the first bent portion 20 that bends to one side in the vehicle front-rear direction (in this embodiment, the vehicle front side) as it goes upward. And an inclined portion 21 that inclines toward the one side and extends toward the upper side of the vehicle. The base portion 8 of the roll bar 7 has a second bent portion 22 that is formed at an upper portion of the inclined portion 21 and bends to the other side (vehicle rear side) in the vehicle front-rear direction as it goes upward of the vehicle. Further, an auxiliary bracket 24 having a load receiving portion 23 facing the vehicle body floor with a gap is disposed on the base portion 8 of the roll bar 7 on the one side of the inclined portion 21.

  The load input to the roll bar 7 from the roof side rail 1 or the pillar 2 through the connecting bracket 10 due to the rollover of the vehicle or the like, as shown in FIG. Part (part B in FIG. 5). An input load is transmitted to the bulkhead 4 from the lower end portion of the roll bar 7 on the inner side in the vehicle width direction.

  Here, the base portion 8 of the roll bar 7 is bent to the vehicle front side, and the second bending portion 20 is bent to the vehicle rear side above the first bending portion 20 and to the vehicle rear side. And a bent portion 22. Furthermore, the base portion 8 is formed between the first bent portion 20 and the second bent portion 22, and has an inclined portion 21 that extends inclined toward the vehicle front side as it goes upward of the vehicle. For this reason, when a load is input to the roll bar 7, as indicated by an arrow C in FIG. 6, the roll bar 7 is bent and deformed forward of the vehicle with the first bent portion 20 and the second bent portion 22 as base points. Can be controlled.

  When the roll bar 7 is bent and deformed toward the front of the vehicle with the first bent portion 20 as the base point, the bulkhead in which the load receiving portion 23 of the auxiliary bracket 24 disposed on the base portion 8 is part of the vehicle body floor via the carpet 6. 4 hits. For this reason, after the load receiving portion 23 hits the bulkhead 4, the input load is mainly transmitted from the load receiving portion 23 to the bulkhead 4.

  As shown in FIG. 7, the reaction force of the roll bar 7 is initially large (time T0 to T1), and the reaction force decreases after the load receiving portion 23 hits the bulkhead 4 (time T1). . On the other hand, the reaction force of the auxiliary bracket 24 provided with the load receiving portion 23 is zero at the initial time (time T0 to T1), and after the load receiving portion 23 comes into contact with the bulkhead 4 (time T1), the reaction force is to some extent. It grows up to. The reaction force of the carpet 6 is low at the initial contact (time T1 to T2) of the load receiving portion 23, but after time T2, the reaction force gradually increases at the stage where the load receiving portion 23 crushes each layer of the carpet 6. It gets bigger.

  Therefore, the concentration of the input load on the roll bar 7 is alleviated, and the reaction force peak of the roll bar 7 can be reduced. Even if the main body portion 9 of the roll bar 7 has a bent portion other than the first bent portion 20 and the second bent portion 22, the concentration of the input load on the bent portion can be reduced. For this reason, it is possible to absorb the energy of the load input without breaking the roll bar 7, and efficient energy absorption becomes possible. Therefore, the bending deformation of the roll bar 7 at the time of load input can be suppressed.

  Here, since the auxiliary bracket 24 disposed on the base portion 8 of the roll bar 7 is not intended to improve the strength of the entire roll bar 7, it is sufficient that the size is relatively small. For this reason, even if the auxiliary bracket 24 is added to the roll bar 7, the occupied space of the roll bar 7 is not so large. Therefore, the size of the occupant's living space can be maintained.

  As described above, according to the present embodiment, it is possible to suppress the bending deformation of the roll bar 7 during load input while maintaining the size of the occupant's living space.

  (2) The 1st bending part 20 of the said base part 8 may be made into the shape which dented the surface of the said one side (vehicle front side) toward the other side (vehicle rear side).

  By concave the front surface of the first bent portion 20 of the base portion 8 toward the rear of the vehicle, the depressed portion (first bent portion 20) when a load is input to the roll bar 7. The roll bar 7 can be controlled to be locally deformed. Thereby, the energy at the initial stage of load input can be absorbed by the roll bar 7, and more efficient energy absorption becomes possible.

  (3) The load receiving portion 23 may be formed in a flat plate shape, and may have a flat surface 23a that faces the vehicle body floor.

  By forming a flat surface 23 a facing the bulkhead 4 which is a part of the vehicle body floor in the load receiving portion 23, when the load receiving portion 23 hits the bulkhead 4 when a load is input to the roll bar 7. The input load is easily transmitted from the load receiving portion 23 to the bulkhead 4. Thereby, energy can be efficiently absorbed by the auxiliary bracket 24, and more efficient energy absorption becomes possible.

  The occupant protection device of the present invention has been described by taking the above embodiment as an example. However, the present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention.

  For example, the roll bar may be disposed on the back side of the passenger seat, or may be disposed on the back side of a seat other than the driver seat and the passenger seat. In addition, the above-described embodiment includes the bending direction of the first bent portion and the second bent portion formed in the base portion of the roll bar, the inclined direction of the inclined portion, etc., with “one side of the vehicle longitudinal direction” as the vehicle rear side. May be reversed.

4 Bulkhead (body floor)
5 Driver's seat
5a Seat cushion 5b Seat back 7 Roll bar 8 Base portion 9 Body portion 20 First bent portion 21 Inclined portion 22 Second bent portion 23 Load receiving portion 23a Plane 24 Auxiliary bracket

Claims (3)

A seat having a seat cushion and a seat back; and a roll bar disposed on the back side of the seat, wherein the roll bar is fixed to a vehicle body floor, and the seat of the seat from the base portion. In the occupant protection device having a main body extending toward the vehicle upper side to a height near the upper end of the back,
The base portion is bent to one side in the vehicle front-rear direction as it goes upward of the vehicle, and extends from the first bent portion toward the vehicle upper side, and the one side as it goes upward of the vehicle. An inclined portion extending inclined to the side, and a second bent portion that is formed on the upper portion of the inclined portion and bends to the other side in the vehicle front-rear direction as it goes upward of the vehicle,
An occupant protection device, wherein an auxiliary bracket having a load receiving portion facing the vehicle body floor with a gap is disposed on the one side with respect to the inclined portion.   The occupant protection device according to claim 1, wherein the first bent portion of the base portion has a shape in which the surface on the one side is recessed toward the other side.   The occupant protection device according to claim 1, wherein the load receiving portion is formed in a flat plate shape and has a flat surface facing the vehicle body floor.

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