JP2019196081A - Vehicle front part structure - Google Patents

Abstract

To provide a vehicle front part structure which inhibits increase of air resistance during running while reducing sound emitted from an engine room to the outside of a vehicle.SOLUTION: A vehicle front part structure 10 includes a sound insulation body 20 which is disposed within a front wheel house 7 of a vehicle 1 in which an engine 3 is mounted on a front part 2 and blocks sound emitted from the engine 3 to the front wheel house 7 side. The sound insulation body 20 has: a sound insulation wall part 21 disposed at the vehicle rear relative to a drive shaft 8 and a tie rod 9 of the vehicle 1 and at the vehicle side relative to the engine 3; and an air guide wall part 22 which is disposed between the drive shaft 8 and the tie rod 9 and the sound insulation wall part 21 and at the vehicle side relative to a front end part 21c of the sound insulation wall part 21. The air guide wall part 22 guides inflow air that flows from the engine 3 side into the front wheel house 7 and passes through the vehicle front relative to the sound insulation wall part 21 so that the inflow air passes through a space between the air guide wall part 22 and the sound insulation wall part 21 and flows to the vehicle rear.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a vehicle front structure.

  As a vehicle front structure for reducing sound leaking from the engine room of a vehicle to the outside of the vehicle, for example, a structure in which a sound insulation wall or the like is arranged between a wheel and a side member in a wheel house is known (for example, Patent Document 1). reference).

JP 2010-52660 A

  Generally, in the vehicle wheel house, an opening for connecting the engine room and the wheel house is formed on the vehicle rear side of the drive shaft and the tie rod. For this reason, the sound generated by the engine passes through the opening from the engine room and is transmitted into the wheel house and leaks outside the vehicle. In view of this, it is conceivable that a sound insulation wall is disposed at a position where the opening is blocked to block noise leaking from the engine room through the opening to effectively reduce outside noise.

  By the way, when the vehicle travels, for example, traveling wind that flows toward the rear side of the vehicle along the side surface of the vehicle body is generated, and inflow air that flows from the engine room through the opening described above into the front wheel house is generated. For this reason, when the sound insulation wall is arranged at a position that closes the opening, the flow of the inflowing air that attempts to pass through the opening is disturbed by the sound insulation wall, and the inflowing air that has entered the sound insulation wall flows out toward the side of the vehicle. Become. As a result, the inflow air toward the side of the vehicle and the traveling wind toward the rear of the vehicle collide with each other, which may increase the air resistance of the vehicle.

  Therefore, an object of the present disclosure is to provide a vehicle front structure that can suppress an increase in air resistance during traveling while reducing sound from the engine room to the outside of the vehicle.

  A vehicle front structure according to an aspect of the present disclosure includes a sound insulator that is disposed in a front wheel house of a vehicle in which an engine is mounted on the front, and that blocks sound from the engine to the front wheel house. A sound insulation wall portion disposed on the vehicle rear side in the vehicle front-rear direction from the vehicle drive shaft and tie rod and on the vehicle side direction in the vehicle width direction from the engine, and the drive shaft, tie rod and sound insulation wall portion in the vehicle front-rear direction. And an air guide wall portion disposed on the side of the vehicle in the vehicle width direction from the front end portion of the sound insulation wall portion, and the air guide wall portion flows into the front wheel house from the engine side. The inflowing air that passes the vehicle front side in the vehicle front-rear direction than the sound insulation wall portion passes between the air guide wall portion and the sound insulation wall portion. To guide the flow in the vehicle rear in both longitudinal directions.

  According to various aspects of the present disclosure, it is possible to suppress an increase in air resistance during traveling while reducing sound from the engine room to the outside of the vehicle.

FIG. 1 is a perspective view showing a vehicle front structure according to the present embodiment. FIG. 2 is a perspective view showing a state in which the sound insulator is removed from FIG. FIG. 3 is a plan view schematically showing the vehicle front structure. FIG. 4 is a perspective view schematically showing a sound insulator. FIG. 5 is a plan view schematically showing the positional relationship between the sound insulation wall portion and the air guide wall portion. FIG. 6 is a plan view schematically showing a positional relationship between the sound insulation wall portion and the air guide wall portion of the sound insulation body according to the modification.

  Hereinafter, exemplary embodiments will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a vehicle front structure 10 according to the present embodiment. FIG. 2 is a perspective view showing a state in which the sound insulating body 20 is removed from FIG. FIG. 3 is a plan view schematically showing the vehicle front structure 10. As shown in FIGS. 1 to 3, the vehicle 1 is a passenger car or the like in which an engine 3 is mounted on a front 2. In the following description, the vehicle front-rear direction, the vehicle width direction, and the vehicle height direction of the vehicle 1 are referred to as an x-axis direction, a y-axis direction, and a z-axis direction, respectively. When the vehicle 1 travels, for example, traveling wind that flows toward the vehicle rear side in the x-axis direction is generated along the side surface of the vehicle body of the vehicle 1.

  In addition to the engine 3 described above, the vehicle 1 includes a subframe 4 that holds the engine 3 and the like, a pair of front side members 5 that secure rigidity of the front 2 portion, a front wheel 6, and a front wheel house 7 in which the front wheel 6 is disposed. A drive shaft 8 that transmits the driving force from the engine 3 to the front wheels 6 and a tie rod 9 that changes the direction of the front wheels 6 according to steering are provided. In addition, the vehicle 1 employs a vehicle front structure 10 including a sound insulator 20. The vehicle front structure 10 may be employed on either the left side or the right side of the vehicle 1, and may be employed on both the left side and the right side. Hereinafter, although the vehicle front part structure 10 employ | adopted on the left side of the vehicle 1 is illustrated and demonstrated, the vehicle front part structure 10 employ | adopted on the right side of the vehicle 1 may also be provided with the same structure.

  The sub frame 4 is a member arranged below the engine 3 and extends substantially horizontally in the x-axis direction along the lower surface of the vehicle body of the vehicle 1. More specifically, the sub frame 4 extends at least from below the drive shaft 8 and the tie rod 9 to the vicinity of the rear end of the front wheel house 7 in the x-axis direction.

  The front side member 5 is a long member disposed on each of the left and right sides of the engine room. For example, the front side member 5 extends in the x-axis direction from the vicinity of a dash panel (not shown) to the front of the vehicle 1. The lower surface portion 5a of the front side member 5 has the following shape, for example. The lower surface portion 5a of the front side member 5 is located near or overlapping with the subframe 4 in the vicinity of the rear end portion of the front wheel house 7 as viewed from the y-axis direction (that is, a position near the lower surface of the vehicle body of the vehicle 1). Exists. The lower surface portion 5 a of the front side member 5 extends upward in the z-axis direction toward the front of the vehicle and extends to above the drive shaft 8 and the tie rod 9. The lower surface portion 5 a of the front side member 5 extends substantially horizontally to the front portion of the vehicle 1 when viewed from the y-axis direction on the vehicle front side of the drive shaft 8 and the tie rod 9.

  The front wheel 6 is accommodated in the front wheel house 7. The front wheel 6 is connected to an end portion of a drive shaft 8 connected to the engine 3 via a transmission or the like. The front wheel 6 is connected to a tie rod 9 and is directed in a direction corresponding to the traveling direction of the vehicle 1 as the tie rod 9 advances and retreats in the y-axis direction according to steering.

  As viewed from the y-axis direction, the subframe 4, the front side member 5, the drive shaft 8, and the tie rod 9 define an opening P (see FIG. 2). That is, the area surrounded by the subframe 4, the front side member 5, the drive shaft 8, and the tie rod 9 is not blocked by a partition wall or the like. Note that “not blocked” is not necessarily limited to an aspect in which no member is present in the opening P, and an amount of member that allows sound and airflow to pass through the opening P is opened. A mode existing in the part P is also included. The opening P is formed so as to connect the engine room and the front wheel house 7. The sound generated by the engine 3 is transmitted from the engine room through the opening P to the front wheel house 7. In addition, when the vehicle 1 travels, inflow air flows from the engine room through the opening P into the front wheel house 7.

  FIG. 4 is a perspective view schematically showing the sound insulator 20. As shown in FIGS. 1 to 4, the sound insulator 20 is a member that is disposed in the front wheel house 7 of the vehicle 1 and blocks sound from the engine 3 toward the front wheel house 7. In particular, the sound insulator 20 blocks sound transmitted from the engine room through the opening P into the front wheel house 7. The sound insulator 20 is disposed at a position where the opening P is blocked in the front wheel house 7. In addition, the sound insulator 20 guides inflow air that passes through the opening P from the engine room and flows into the front wheel house 7.

  The sound insulation body 20 includes a sound insulation wall portion 21, an air guide wall portion 22, an upper connection portion 23, and a lower connection portion 24. The sound insulator 20 may be formed of a sound absorbing material such as a glass fiber material, for example, and may be formed of a sound absorbing material having a sound absorption rate of 0.2 to 0.8 at a frequency of 500 Hz to 2000 Hz. Good.

  The sound insulation wall portion 21 blocks sound transmitted from the engine room through the opening P to the front wheel house 7. The sound insulation wall 21 is located on the vehicle rear side in the x-axis direction from the drive shaft 8 and tie rod 9 of the vehicle 1 and on the vehicle side in the y-axis direction from the engine 3 (that is, the vehicle center in the y-axis direction of the vehicle 1). On the side opposite to the side). The sound insulating wall portion 21 has, for example, a plate shape and is disposed so as to close at least a part of the opening P. The sound insulation wall portion 21 is disposed at a position where inflow air flowing into the front wheel house 7 from the engine 3 side passes through the vehicle front side in the x-axis direction from the sound insulation wall portion 21.

  The sound insulating wall 21 is formed so that the lower end 21 a extends along the upper surface 4 a of the subframe 4 and the upper end 21 b extends along the lower surface 5 a of the front side member 5 when disposed in the front wheel house 7. Yes. More specifically, when the sound insulating wall portion 21 is disposed in the front wheel house 7, its lower end portion 21 a extends substantially horizontally in the x-axis direction, and its upper end portion 21 b is behind the sound insulating wall portion 21. It may be formed so as to extend upward in the z-axis direction from the end toward the front side. That is, the sound insulating wall 21 may have a substantially triangular shape that widens from the rear end toward the front side. The front end portion 21c of the sound insulating wall portion 21 is separated from the rear end portion 22c of the air guide wall portion 22 and extends, for example, along the z-axis direction.

  The air guide wall portion 22 guides inflow air that passes through the opening P from the engine room and flows into the front wheel house 7. The flow of incoming air guided by the air guide wall 22 will be described later. The air guide wall portion 22 may further block the sound transmitted from the engine room through the opening P to the front wheel house 7. The air guide wall portion 22 is disposed between the drive shaft 8 and the tie rod 9 and the sound insulating wall portion 21 in the x-axis direction, and is disposed on the side of the vehicle in the y-axis direction from the front end portion 21c of the sound insulating wall portion 21. . The air guide wall portion 22 has a plate shape, for example, and is disposed so as to close at least a part of the opening P. The air guide wall portion 22 is disposed at a position where inflow air flowing into the front wheel house 7 from the engine 3 side easily hits the air guide wall portion 22. The air guide wall 22 is disposed at a position where it does not interfere with the locus of the tie rod 9 during steering.

  The air guide wall portion 22 is formed so that the lower end portion 22 a extends along the upper surface portion 4 a of the subframe 4 and the upper end portion 22 b extends along the lower surface portion 5 a of the front side member 5 when disposed in the front wheel house 7. Has been. More specifically, when the air guide wall portion 22 is disposed in the front wheel house 7, its lower end portion 22a extends substantially horizontally in the x-axis direction, and its upper end portion 22b is an air guide wall. It may be formed so as to extend upward in the z-axis direction from the rear end of the portion 22 toward the front side. The rear end portion 22c of the air guide wall portion 22 is separated from the front end portion 21c of the sound insulating wall portion 21, and extends, for example, along the z-axis direction. The air guide wall portion 22 may have a quadrangular shape extending in the z-axis direction as a longitudinal direction.

  The upper connecting portion 23 connects the sound insulating wall portion 21 and the air guide wall portion 22 upward. The upper connecting portion 23 maintains the positional relationship between the sound insulation wall portion 21 and the air guide wall portion 22 and ensures the rigidity of the sound insulation body 20 as a whole. The upper connecting portion 23 is formed along the lower surface portion 5 a of the front side member 5.

  The lower connection part 24 connects the sound insulation wall part 21 and the air guide wall part 22 downward. The lower connecting portion 24 maintains the positional relationship between the sound insulation wall portion 21 and the air guide wall portion 22 and ensures the rigidity of the sound insulation body 20 as a whole. The lower connecting portion 24 is formed along the upper surface portion 4 a of the subframe 4.

  As described above, the front end portion 21c of the sound insulating wall portion 21 and the rear end portion 22c of the air guide wall portion 22 are separated from each other in the x-axis direction. Thereby, a gap G is formed between the front end portion 21 c of the sound insulating wall portion 21 and the rear end portion 22 c of the air guide wall portion 22. Here, the upper portion of the gap G is defined by the upper connecting portion 23 and the lower portion thereof is defined by the lower connecting portion 24. That is, the gap G has a substantially rectangular shape defined by the front end portion 21 c of the sound insulating wall portion 21, the rear end portion 22 c of the air guide wall portion 22, the upper connecting portion 23, and the lower connecting portion 24.

  Next, the positional relationship between the sound insulation wall 21 and the air guide wall 22 when viewed from the z-axis direction will be described. FIG. 5 is a plan view schematically showing the positional relationship between the sound insulation wall 21 and the air guide wall 22.

  When viewed from the z-axis direction, the extending direction of the sound insulating wall portion 21 and the extending direction of the air guide wall portion 22 have an inclination of an angle θ. Here, the air guide wall portion 22 extends, for example, in parallel to the x-axis direction, and the sound insulation wall portion 21 extends toward the vehicle center side in the y-axis direction with respect to the x-axis direction as it goes toward the front of the vehicle. Extending at an angle θ. The angle θ is, for example, not less than 15 degrees and not more than 25 degrees.

  Further, in the x-axis direction, the front end portion 21c of the sound insulating wall portion 21 and the rear end portion 22c of the air guide wall portion 22 are separated by a distance L. The distance L is the width of the gap G in the x-axis direction. The distance L may be set to a distance that allows the inflowing air F1 and F2 to suitably pass through the gap G. For example, the distance L is set to a distance according to the layout of the front 2 portion of the vehicle 1.

  Then, with reference to FIG. 5, the flow of inflow air F1, F2 at the time of driving | running | working of the vehicle 1 is demonstrated.

  During traveling of the vehicle 1, for example, inflow air F <b> 1 and F <b> 2 flows into the front wheel house 7 through the opening P from the engine room. The inflow air F1 is air that flows so as to go from the vehicle front side to the vehicle rear side in the x-axis direction toward the side opposite to the vehicle center side in the y-axis direction. The inflow air F2 is air that flows substantially parallel to the y-axis direction toward the side opposite to the vehicle center side in the y-axis direction.

  When the inflow air F1 flows into the front wheel house 7, the inflow air F1 passes through the gap G and flows to the rear side of the vehicle. That is, the inflowing air F1 passes between the rear end portion 22c of the air guide wall portion 22 and the front end portion 21c of the sound insulation wall portion 21, and flows to the vehicle rear side in the x-axis direction along the sound insulation wall portion 21. Guided by the guide wall 22. In other words, the air guide wall portion 22 flows into the front wheel house 7 from the engine 3 side, and the inflow air F1 passes through the vehicle front side in the x-axis direction from the sound insulation wall portion 21 and the inflow air F1 is the air guide wall. It is guided so as to pass between the portion 22 and the sound insulation wall portion 21 and flow toward the vehicle rear side in the x-axis direction. The inflowing air F <b> 1 that flows to the vehicle rear side along the sound insulating wall portion 21 merges with traveling wind that flows toward the vehicle rear side along the side surface of the vehicle body of the vehicle 1. At this time, since the inflow air F1 flows in the direction along the traveling wind, it is difficult to disturb the flow of the traveling wind.

  When the inflowing air F2 flows into the front wheel house 7, the inflowing air F2 changes its direction so as to hit the air guide wall portion 22 and flow toward the rear side of the vehicle, passes through the gap G, and flows toward the rear side of the vehicle. That is, the inflowing air F2 passes between the rear end portion 22c of the air guide wall portion 22 and the front end portion 21c of the sound insulation wall portion 21, and flows to the vehicle rear side in the x-axis direction along the sound insulation wall portion 21. Guided by the guide wall 22. In other words, the air guide wall portion 22 flows into the front wheel house 7 from the engine 3 side, and the inflow air F2 passes through the vehicle front side in the x-axis direction from the sound insulation wall portion 21 and the inflow air F2 is the air guide wall. It is guided so as to pass between the portion 22 and the sound insulation wall portion 21 and flow toward the vehicle rear side in the x-axis direction. The inflow air F <b> 2 that has flowed to the vehicle rear side along the sound insulation wall portion 21 merges with the traveling wind that flows toward the vehicle rear side along the side surface of the vehicle body of the vehicle 1. At this time, since the inflowing air F2 flows in a direction along the traveling wind, it is difficult to disturb the flow of the traveling wind.

  As described above, in the vehicle front structure 10, the sound insulating body 20 includes the sound insulating wall portion 21 disposed on the vehicle rear side of the drive shaft 8 and the tie rod 9 and on the vehicle side of the engine 3, and the drive shaft 8. And an air guide wall portion 22 disposed between the tie rod 9 and the sound insulation wall portion 21. For this reason, the sound insulating body 20 can block the opening P between the engine room formed on the vehicle rear side of the drive shaft 8 and the tie rod 9 and the front wheel house 7. Therefore, the vehicle front part structure 10 can block the sound leaking from the engine room through the opening P to the outside of the vehicle, and can effectively reduce the outside noise. In the sound insulating body 20, a gap G is formed between the sound insulating wall portion 21 and the air guide wall portion 22. The inflowing airs F1 and F2 that flow into the front wheel house 7 through the opening P from the engine room when the vehicle 1 travels pass through the gap G and pass along the sound insulation wall 21 to the rear side of the vehicle in the x-axis direction. It is guided by the air guide wall 22 so as to flow. That is, the inflowing air F1, F2 is prevented from flowing out toward the vehicle side by being disturbed by the sound insulating body 20. Thus, since the inflow air F1 and F2 flows to the vehicle rear side along the sound insulation wall portion 21, they smoothly merge with the traveling wind flowing toward the vehicle rear side along the side surface of the vehicle body of the vehicle 1. Therefore, the flow of the traveling wind is hardly disturbed by the inflowing air F1 and F2, and the adverse effect on the air resistance of the vehicle 1 is reduced. As described above, according to the vehicle front structure 10, it is possible to suppress an increase in air resistance during traveling while reducing sound from the engine room to the outside of the vehicle.

  The above-described embodiments can be implemented in various forms with various changes and improvements based on the knowledge of those skilled in the art.

  For example, the front end 21c of the sound insulation wall 21 and the rear end 22c of the air guide wall 22 need only be separated in the y-axis direction and may not be separated in the x-axis direction. In other words, the distance L may be 0 mm. FIG. 6 is a plan view schematically showing the positional relationship between the sound insulation wall portion 21 and the air guide wall portion 22 of the sound insulation body 20A according to the modification. As shown in FIG. 6, in the sound insulating body 20 </ b> A, the front end portion 21 c of the sound insulating wall portion 21 and the rear end portion 22 c of the air guide wall portion 22 are in the same position when viewed from the y-axis direction. Also in the sound insulating body 20A, the front end portion 21c of the sound insulating wall portion 21 and the rear end portion 22c of the air guide wall portion 22 are separated in the y-axis direction, and this separated portion forms a gap G. Also in the sound insulator 20A having such a configuration, the inflowing airs F1 and F2 pass between the rear end portion 22c of the air guide wall portion 22 and the front end portion 21c of the sound insulating wall portion 21 as in the sound insulator 20. Then, the air guide wall portion 22 is guided so as to flow along the sound insulating wall portion 21 toward the vehicle rear side in the x-axis direction. In other words, also in the sound insulator 20A, the air guide wall portion 22 flows into the front wheel house 7 from the engine 3 side, and flows in air F1 and F2 passing through the vehicle front side in the x-axis direction from the sound insulating wall portion 21. The inflowing air F1, F2 is guided so as to pass between the air guide wall portion 22 and the sound insulation wall portion 21 and flow to the vehicle rear side in the x-axis direction.

  Further, the lower portion of the opening P may be defined by a suspension member instead of the subframe 4. That is, the suspension member, the front side member 5, the drive shaft 8, and the tie rod 9 may define the opening P.

  The sound insulator 20 may not have the upper connecting portion 23. The sound insulating body 20 may not have the lower connecting portion 24. The sound insulator 20 may further include a connecting portion other than the upper connecting portion 23 and the lower connecting portion 24.

  Moreover, the sound insulation wall part 21 may be comprised by the some wall part mutually spaced apart, and the air guide wall part 22 may be comprised by the some wall part mutually spaced apart. In addition, a plurality of gaps G may be formed in the sound insulator 20.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Front, 3 ... Engine, 7 ... Front wheel house, 8 ... Drive shaft, 9 ... Tie rod, 10 ... Vehicle front part structure, 20 ... Sound insulation, 21 ... Sound insulation wall part, 22 ... Air guide wall part , F1, F2 ... inflow air.

Claims (1)

It is arranged in a front wheel house of a vehicle equipped with an engine on the front, and includes a sound insulation body that blocks sound from the engine to the front wheel house side,
The sound insulator is
A sound insulation wall portion arranged on the vehicle rear side in the vehicle longitudinal direction from the drive shaft and tie rod of the vehicle and on the vehicle side side in the vehicle width direction from the engine;
An air guide wall disposed between the drive shaft and the tie rod in the vehicle front-rear direction and the sound insulation wall, and disposed closer to the vehicle side in the vehicle width direction than the front end of the sound insulation wall; Have
The air guide wall portion flows into the front wheel house from the engine side, and the inflow air passes through the vehicle front side in the vehicle front-rear direction than the sound insulation wall portion. A vehicle front structure that guides the vehicle so as to pass through the sound insulation wall and flow to the vehicle rear side in the vehicle front-rear direction.

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