JP2017226307A - Vehicle front part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle front part structure capable of displacing a steering wheel promptly to a front side of the vehicle without depending on displacement of a brake booster.SOLUTION: A front side member 10 includes: a front-side extension part 101; a rear-side extension part 102 arranged more on a rear side of a vehicle from the front-side extension part 101; and a kick part 103 that joins a rear end of the front-side extension part 101 to a front end of the rear-side extension part 102. When a load is input to the front side member 10 from a front side of the vehicle, the kick part 103 deforms, so that the rear-side extension part 102 deforms toward the front side of the vehicle relatively to the front-side extension part 101. Behind a steering gear box 21 of a steering device 20, a mass body 31 supported on the rear-side extension part 102 is arranged. THen, when the rear-side extension part 102 deforms toward the front side of the vehicle relatively to the front-side extension part 101 by the deformation of the kick part 103, the mass body 31 comes into contact with the steering gear box 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle front structure that displaces a steering wheel forward of a vehicle when a collision occurs at the front of the vehicle.

  The vehicle front structure described in Patent Document 1 is configured to displace the brake booster when a collision occurs at the vehicle front. Specifically, when a load resulting from the collision is applied to the brake booster, the upper portion of the brake booster is displaced rearward of the vehicle. And since the steering column which supports a steering shaft is pulled in ahead of vehicles by such displacement of a brake booster, a steering wheel is displaced ahead of vehicles.

JP 2000-127990 A

  By the way, the vehicle has a pair of front side members arranged in parallel in the vehicle width direction. When a collision occurs at the front of the vehicle, the load resulting from the collision is absorbed by the deformation of both front side members. At this time, a load that cannot be absorbed by the deformation of both front side members is input to the brake booster via other components in the engine room. Therefore, a time lag occurs from when a collision occurs in the front of the vehicle to when the brake booster starts to be displaced, and there is a possibility that the displacement of the steering wheel toward the front of the vehicle may be delayed. Therefore, there is a demand for a structure that can quickly displace the steering wheel forward of the vehicle without depending on the displacement of the brake booster.

  A vehicle front structure for solving the above problems includes a pair of front side members arranged in parallel in the vehicle width direction, a steering device disposed between the front side members in the vehicle width direction, and Is provided. In the front structure of the vehicle, each front side member includes a front extending portion that extends in the vehicle longitudinal direction, a rear extending portion that is disposed on the vehicle rear side with respect to the front extending portion and extends in the vehicle longitudinal direction, A kick portion connecting the rear end of the front extension portion and the front end of the rear extension portion, and when the load is input from the front of the vehicle to the front side member, the kick portion is deformed and the rear side The extending portion is relatively displaced forward of the vehicle with respect to the front extending portion. In addition, the steering device includes a steering gear box supported by each front extending portion, a steering shaft coupled to the steering gear box, and a steering wheel coupled to the steering shaft. . A mass body that is supported by the rear extension portion of each front side member is provided behind the steering gear box, and the rear extension portion is formed with respect to the front extension portion by deformation of the kick portion. Thus, the mass body is configured to abut against at least one of the steering gear box and the steering shaft when the vehicle is relatively displaced forward of the vehicle.

  According to the above configuration, when a collision occurs at the front portion of the vehicle while traveling, the pair of front side members starts to deform as described above, and the mass body comes into contact with at least one of the steering gear box and the steering shaft. Then, the steering device is pushed forward by the inertia force of the mass body, and the state where the steering gear box is supported by the front side member is eliminated. Even after that, when the steering device is pushed forward of the vehicle by the mass body, the steering device moves forward of the vehicle, and the steering wheel is displaced forward of the vehicle. Therefore, the steering wheel can be displaced to the front of the vehicle at an early stage without depending on the displacement of the brake booster.

The perspective view which shows typically the front part structure of the vehicle of embodiment. The side view of the front part structure of the vehicle. Sectional drawing which shows the state by which the mass body was fixed to the floor panel in the front part structure of the vehicle. (A) is an operational view showing the front structure of the vehicle immediately after the front part of the vehicle collides with an obstacle, and (b) shows that the front side member is deformed by the front part of the vehicle colliding with the obstacle. FIG. 6 is an operation diagram showing the front structure of the vehicle in FIG.

Hereinafter, an embodiment of a vehicle front structure will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the vehicle front structure of the present embodiment includes a pair of front side members 10 arranged in parallel in the vehicle width direction, and a bumper reinforcement 11 extending in the vehicle width direction. ing. Each front side member 10 includes a front extending portion 101 extending in the vehicle front-rear direction, a rear extending portion 102 disposed rearward and lower than the front extending portion 101 and extending in the vehicle front-rear direction, Each has a kick portion 103 that connects the rear end of the front extension portion 101 and the front end of the rear extension portion 102. The kick portion 103 extends rearward and obliquely downward from a connection portion with the front extending portion 101.

  Further, a crash box 12 is provided at the front end of each front extending portion 101. Each front side member 10 supports a bumper reinforcement 11 via a crash box 12.

  A subframe 13 is provided below the front extending portion 101 of each front side member 10. Among the front portions of the subframe 13, one end in the vehicle width direction is a front attachment portion with respect to the front extending portion 101 of the front side member 10 located on one side in the vehicle width direction among the front side members 10. 14 are connected. Further, of the front portion of the sub-frame 13, the end on the other side in the vehicle width direction is attached to the front side extension portion 101 of the front side member 10 located on the other side in the vehicle width direction of each front side member 10. They are connected via the part 14. On the other hand, the end of one side in the vehicle width direction of the rear portion of the sub-frame 13 is connected to the rear side extending portion 102 of the front side member 10 located on one side of the front side member 10 by a bolt or the like. It is fixed. Of the rear part of the sub-frame 13, the end part on the other side in the vehicle width direction is fixed to the rear side extension part 102 located on the other side in the vehicle width direction among the front side members 10 by bolts or the like. Yes. As will be described in detail later, such a connection between the subframe 13 and each of the rear extending portions 102 is canceled when a collision occurs in the front portion of the vehicle.

  Note that a pair of under members 15 arranged in parallel in the vehicle width direction is attached to the subframe 13. Specifically, each under member 15 extends forward from the front portion of the subframe 13. A crash box 16 is provided at the front end of each under member 15.

  As shown in FIGS. 1 and 2, the vehicle steering device 20 includes a steering gear box 21 disposed on the subframe 13 and a steering shaft 22 connected to the steering gear box 21. Yes. The steering shaft 22 extends rearward and obliquely upward, and a steering wheel 23 is fixed to the rear end of the steering shaft 22. A fixing portion 211 is provided in the housing 21 </ b> A of the steering gear box 21, and the fixing portion 211 is fixed to the subframe 13. That is, in the present embodiment, the steering gear box 21 is supported by each front extending portion 101 via the subframe 13 and the front mounting portion 14.

  As shown in FIGS. 1 and 2, the vehicle is provided with a floor panel 30 that is supported by the rear extension 102 of each front side member 10. A portion of the floor panel 30 disposed on the rear extending portion 102 is fixed to the rear extending portion 102 by welding or the like. In addition, a mass body 31 located behind the steering gear box 21 is attached to the floor panel 30.

  As shown in FIGS. 1 and 3, the mass body 31 includes a battery case 32 and battery cells 33. The battery case 32 is provided with a pack lower panel 321 and a pack upper panel 322, and a battery cell 33 is provided in an accommodation space formed between the pack lower panel 321 and the pack upper panel 322. As shown in FIGS. 1 and 2, the battery case 32 is provided with a protrusion 311 that protrudes forward, and the front end of the protrusion 311 is disposed on the subframe 13. That is, the protruding portion 311 of the mass body 31 is disposed immediately after the steering gear box 21. In the present embodiment, the protrusion 311 is disposed at a position different from the steering shaft 22 in the vehicle width direction, specifically, at the center in the vehicle width direction.

  Next, with reference to FIG. 4, the operation when the front part of the traveling vehicle collides with the obstacle X will be described together with effects. In FIG. 4, illustration of some members such as the front attachment portion 14 is omitted for convenience of explanation of the operation.

  When the front part of the traveling vehicle collides with the obstacle X as indicated by the white arrow in FIG. 4A, the load that could not be absorbed by the crash box 12 among the loads caused by the collision is transferred to each front. Input to the side member 10. Then, each front side member 10 is deformed in such a manner that the rear extending portion 102 is relatively displaced forward with respect to the front extending portion 101 by the deformation of the kick portion 103.

  Further, in the present embodiment, the subframe 13 is provided with a pair of under members 15, and when the front part of the vehicle collides with the obstacle X, the load caused by the collision could not be absorbed by the crash box 16. A load is input to the subframe 13 via each under member 15.

  That is, when the rear extending portions 102 start to be relatively displaced forward due to the deformation of the front side members 10, the forward displacement of the subframe 13 is restricted by the input of the load from each under member 15. Therefore, the load applied to the connecting portion between each rear extension portion 102 and the subframe 13 increases, and the connecting portion is broken. That is, the connection between the subframe 13 and each of the rear extending portions 102 is canceled. Accordingly, the protrusion 311 of the mass body 31 that is relatively displaced forward together with each of the rear extending portions 102 is supported by the subframe 13 by the relative displacement of each of the rear extending portions 102 to the front extending portion 101 in the forward direction. It abuts on the steering gear box 21.

  In addition, the state where the steering gear box 21 is pushed forward by the inertial force of the mass body 31 and the forward displacement of the sub-frame 13 is restricted by the load input from the under member 15 is continued. Therefore, the load applied to the connection portion between the steering gear box 21 and the sub frame 13 increases, and the connection portion is broken. Then, as shown in FIG. 4B, the steering gear box 21 is displaced forward by the inertial force of the mass body 31. As a result, the steering device 20 moves forward and the steering wheel 23 is displaced forward. That is, in the present embodiment, the steering wheel 23 can be displaced forward by utilizing the deformation of each front side member 10. Therefore, the steering wheel 23 can be displaced forward quickly without depending on the displacement of the brake booster.

The above embodiment may be changed to another embodiment as described below.
The mass body 31 may have any shape as long as the steering device 20 can be pushed forward when each front side member 10 is deformed. For example, the mass body 31 may have a shape in which the protruding portion 311 is located at the same position as the steering shaft 22 in the vehicle width direction. In this case, when the mass body 31 is displaced forward due to the deformation of each front side member 10, the protruding portion 311 can be brought into contact with both the steering gear box 21 and the steering shaft 22. Further, depending on the shape of the mass body 31, the protruding portion 311 can be brought into contact with only the steering shaft 22.

  If the mass body has such a weight that the steering device 20 can be pushed forward by the inertia force when the front side member 10 is deformed by a collision at the front of the vehicle, the mass body other than the battery cell 33 may be used. Other parts may be provided.

The extending direction of the front extending portion 101 of the front side member 10 only needs to substantially coincide with the vehicle front-rear direction, and the extending direction may not completely coincide with the vehicle front-rear direction.
The extending direction of the rear extending portion 102 of the front side member 10 only needs to substantially coincide with the vehicle front-rear direction, and the extending direction may not completely coincide with the vehicle front-rear direction.

  DESCRIPTION OF SYMBOLS 10 ... Front side member, 101 ... Front side extending part, 102 ... Rear side extending part, 103 ... Kick part, 20 ... Steering device, 21 ... Steering gear box, 22 ... Steering shaft, 23 ... Steering wheel, 31 ... Mass body

Claims (1)

A pair of front side members arranged side by side in the vehicle width direction, and a steering device disposed between the front side members in the vehicle width direction,
Each of the front side members includes a front extending portion that extends in the vehicle longitudinal direction, a rear extending portion that is disposed on the vehicle rear side with respect to the front extending portion and extends in the vehicle longitudinal direction, and a rear end of the front extending portion. And a kick portion connecting the front end of the rear extension portion, and when a load is input from the front of the vehicle to the front side member, the kick portion is deformed and the rear extension portion is It is designed to be relatively displaced forward of the vehicle with respect to the front extension part,
The steering device includes a steering gear box supported by each of the front extending portions, a steering shaft connected to the steering gear box, and a steering wheel connected to the steering shaft. ,
A mass body supported by the rear extension part of each front side member is provided behind the steering gear box, and the rear extension part extends forward due to deformation of the kick part. A front structure of a vehicle, wherein the mass body is configured to abut against at least one of the steering gear box and the steering shaft when the vehicle is relatively displaced in front of the vehicle.

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