JP6332102B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure.

  Patent Document 1 below discloses a vehicle front structure for effectively absorbing collision energy at the time of a frontal collision of a vehicle. Briefly, in this prior art, an Rr mount bracket fixed to the rear portion of a power plant (also referred to as “power unit”) is supported by the rear frame portion via the Rr mount, and the Rr mount has a vehicle width direction. A fragile portion is set at the rear portion of the annular portion with the axial direction as. Further, an inclined surface inclined toward the vehicle lower side toward the vehicle rear side is set on the rear end surface of the side wall portion of the Rr mount bracket, and a steering gear box is disposed opposite to the vehicle rear side of the inclined surface. ing.

  In this prior art, the rear part of the annular part of the Rr mount is damaged at the time of a frontal collision of the vehicle, so that the power plant moves to the rear side of the vehicle. Then, the power plant is moved rearward and downward by bringing the inclined surface of the Rr mount bracket into contact with the steering gear box during the movement.

JP 2015-44439 A

  However, in the above prior art, it is necessary to break the rear portion of the annular portion of the Rr mount, so that the degree of freedom in design is low.

  An object of the present invention is to obtain a vehicle front structure capable of effectively absorbing the collision energy at the time of a frontal collision of the vehicle while securing the degree of design freedom in consideration of the above facts.

The vehicle front portion structure of the present invention described in claim 1 is disposed in a power unit chamber provided in the front portion of the vehicle and generates a driving force for the vehicle to travel, and is positioned on the vehicle lower side of the power unit. And a sub-frame that is disposed on the vehicle rear side of the power unit, connects the power unit and the sub-frame, and is close to the vehicle front side with respect to at least one of a steering gear box and a stabilizer attached to the sub-frame. A bracket that is fixed to the rear end of the power unit in the vehicle front-rear direction, and a mount that is attached to the upper surface side of the subframe and supports the power unit via the bracket. A coupling portion comprising: the mouse for the subframe. The mounting portion is provided with a movement allowing portion that allows relative movement of the connecting portion relative to the sub-frame toward the vehicle rear side when a load greater than a predetermined value is input to the connecting portion from the vehicle front side. The connecting portion is inclined toward the vehicle front side toward the vehicle upper side and is linear in a vehicle side view, and when the connection portion moves relative to the sub frame relative to the vehicle rear side. An inclined surface that contacts at least one of the surfaces is set.

  According to the above configuration, when the movement allowable portion is set in the mounting portion of the mount with respect to the subframe, when a load of a predetermined value or more is input to the connecting portion from the vehicle front side, Relative movement to the vehicle rear side is allowed. For this reason, if a connection part is pushed to the vehicle rear side with the load more than predetermined value with a power unit at the time of front collision of a vehicle, a connection part will move relatively to the vehicle rear side with respect to a sub-frame. Since the movement allowing portion is set at the mounting portion of the mount with respect to the subframe, the degree of freedom in design is relatively high.

  Further, the connecting portion is configured to include a portion disposed close to the front side of the vehicle with respect to at least one of the steering gear box and the stabilizer attached to the subframe. An inclined surface that is inclined toward the front side of the vehicle and is linear in a side view of the vehicle and abuts against at least one of the sub-frame when the connecting portion moves relative to the rear side of the vehicle is set. . For this reason, when the connecting part is displaced to the vehicle rear side together with the power unit at the time of a frontal collision and the inclined surface of the connecting part comes into contact with the at least one side, and the inclined surface of the connecting part is further displaced to the vehicle rear side, the at least one Is guided by the inclined surface and pushed up to the vehicle upper side.

  When the at least one is pushed upward in the vehicle as described above, collision energy is absorbed, and interference (contact) between the at least one and a member disposed on the vehicle rear side is suppressed. Also, at this time, the power unit can be displaced to the space where the at least one of them was originally arranged, so that the movement stroke of the power unit toward the rear side of the vehicle becomes longer and the collision energy is effectively absorbed. The

  As described above, according to the vehicle front structure of the present invention, there is an excellent effect that it is possible to effectively absorb the collision energy at the time of the frontal collision of the vehicle while ensuring the degree of design freedom.

1 is a perspective view showing a part of a vehicle front portion structure according to an embodiment of the present invention as viewed from the obliquely forward front side of a vehicle. It is a perspective view showing the main composition part of the vehicle front part structure concerning one embodiment of the present invention in the state seen from the vehicles back slanting upper part side. FIG. 3 is a perspective view showing the vehicle front structure of FIG. 2 as viewed from the diagonally upper front side of the vehicle. FIG. 3 is an enlarged perspective view showing a main part of the vehicle front structure shown in FIG. It is a side view which expands and shows the principal part of the vehicle front part structure of FIG.

  A vehicle front structure according to an embodiment of the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the front side of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow LH indicates the left side of the vehicle.

(Configuration of the embodiment)
FIG. 1 is a perspective view of a part of the vehicle front structure according to the present embodiment as viewed from the obliquely front side above the vehicle. A power unit chamber 14 is provided in the vehicle front portion 10 shown in FIG. The power unit chamber 14 is provided on the front side of the vehicle with respect to the dash panel 15 (see FIG. 5), and the power unit 12 is shown in the power unit chamber 14 (in FIG. 1, only the outline is shown in a simplified manner with a two-dot chain line). Is arranged. The power unit 12 is also called a power plant. The power unit 12 includes an engine on the right side of the vehicle and a transmission 12T (see FIG. 2) on the left side of the vehicle, and generates a driving force for the vehicle (automobile) to travel.

  A pair of left and right front side members 16 are disposed on both sides of the vehicle front portion 10 with the longitudinal direction of the vehicle being the longitudinal direction. An apron upper member 18 is disposed outside the front side member 16 in the vehicle width direction and above the vehicle. The apron upper member 18 and the front side member 16 are joined to a suspension tower 20 disposed therebetween. The suspension tower 20 supports the upper end of a front suspension (not shown).

  In addition, a pair of left and right front side members 16 and a suspension member 22 as a subframe located on the vehicle lower side of the power unit 12 are disposed in the vehicle front portion 10. The suspension member 22 is formed in a substantially rectangular frame shape when viewed from the upper side of the vehicle, and a pair of front and rear front cross portions 22F and 22R arranged with the vehicle width direction as the longitudinal direction, and the vehicle longitudinal direction as the longitudinal direction. And a pair of left and right side portions 22A and 22B (see FIG. 2). The suspension member 22 has four corners connected to the left and right front side members 16 via suspension member supports 24 and supports left and right front suspensions (not shown).

  A front mount 26 is fixed to the suspension member 22 at a vehicle left side portion of the front cross portion 22F, and a rear mount 28 is fixed to a vehicle left side portion of the rear cross portion 22R. The power unit 12 is supported by the suspension member 22 via a front mount 26 and a rear mount 28. Further, side mounts 30 and 32 are fixed to the pair of left and right front side members 16, and the power unit 12 is supported by the front side member 16 via the side mounts 30 and 32. The structure in which the rear portion of the power unit 12 is attached to the rear cross portion 22R of the suspension member 22 will be described in detail later.

  FIG. 2 is a perspective view of the main components of the vehicle front structure according to the present embodiment as seen from the obliquely upward rear side of the vehicle. FIG. 3 shows the vehicle front structure of FIG. It is shown in the perspective view of the state seen from the front diagonal upper side. In FIG. 3, illustration of the front mount 26 (see FIG. 1) and the like is omitted. FIG. 4 is an enlarged perspective view showing a main part of the vehicle front structure shown in FIG. 2 as viewed obliquely from the upper front side of the vehicle. 2 to 4, the engine is not shown on the right side of the vehicle in the power unit 12. Further, FIG. 5 shows an enlarged side view of the main part of the vehicle front structure shown in FIG.

  As shown in FIG. 2, a long steering gear box 34 and a stabilizer 36 are disposed on the vehicle rear side of the power unit 12. The steering gear box 34 extends in the vehicle width direction and is attached to the rear cross portion 22R of the suspension member 22 via attachment members 35 on both sides of the power unit chamber 14. Further, the stabilizer 36 extends in the vehicle width direction, and an intermediate portion in the vehicle width direction (a range including a position in the vehicle width direction in which the rear mount 28 is disposed) is disposed on the vehicle rear side with respect to the steering gear box 34. . The stabilizer 36 is also attached to the rear cross portion 22R of the suspension member 22 via attachment members 37 on both sides of the power unit chamber 14. Note that the steering gear box 34 and the stabilizer 36 are well-known configurations, and thus detailed description thereof is omitted. In FIG. 5, the cross section of the steering gear box 34 is shown as a block.

  As shown in FIG. 3, a connecting portion 40 that connects the transmission 12 </ b> T of the power unit 12 and the rear cross portion 22 </ b> R of the suspension member 22 is disposed on the vehicle rear side of the power unit 12. The rear mount 28 described above constitutes a part of the connecting portion 40. The connecting portion 40 is configured to include a portion (a part of a bracket 38 to be described later) disposed close to the front side of the vehicle with respect to the steering gear box 34, and the power unit 12 (transmission 12T) in the vehicle front-rear direction. A bracket 38 fixed to the rear end of the rear end is provided. The above-described rear mount 28 is attached to the rear cross portion 22R of the suspension member 22 and supports the power unit 12 via a bracket 38. Hereinafter, the connection part 40 is demonstrated concretely.

  As shown in FIG. 4, the bracket 38 is formed in a substantially U shape (substantially U shape) with the vehicle rear side opened as viewed from above the vehicle, and includes a front wall portion 38A and a pair of left and right side wall portions 38B. I have. The front wall portion 38A is fixed to the rear wall portion of the transmission case 12C constituting the outline of the transmission 12T with a bolt 42 (see FIG. 2). The pair of left and right side wall portions 38B are bent from both ends of the front wall portion 38A in the vehicle width direction and extend to the vehicle rear side.

  As shown in FIG. 5, the rear end surface 38Z of the side wall portion 38B is a vertical surface 38X whose upper end extends in the vehicle vertical direction, and is continuous in the vehicle vertical direction intermediate portion below the vertical surface 38X. Is an inclined surface 38Y (sliding base shape) that is inclined to the vehicle front side and is linear in a vehicle side view. The aforementioned steering gear box 34 is arranged close to the vehicle rear side above the inclined surface 38Y, and the steering gear box 34 is opposed to the inclined surface 38Y than the terminal on the vehicle rear side of the rear mount 28. The vehicle front-rear direction position on the vehicle front side is set. Further, the upper side of the vertical surface 38X and the inclined surface 38Y is set on the vehicle upper side with respect to the rear mount 28.

  As shown in FIG. 4, a mount main body 28H of the rear mount 28 is inserted between the pair of side wall portions 38B. The mount main body 28H includes an outer cylinder 28A and an inner cylinder 28B arranged concentrically with the vehicle width direction as an axial direction, and an elastic portion (for example, vulcanized and bonded) interposed between the outer cylinder 28A and the inner cylinder 28B. The rubber part) 28C is a main part. The inner cylinder 28 </ b> B is fixed between the rear lower ends of the pair of side wall portions 38 </ b> B of the bracket 38 with bolts 44 (see FIG. 2) and nuts 46.

  A front flange 28D projects from the front end and the front side of the lower end of the outer cylinder 28A. The front flange portion 28D is formed in a substantially U shape with the vehicle rear side opened as viewed from the vehicle upper side. A rear flange portion 28E projects from the rear end portion and the rear side of the lower end portion of the outer cylinder 28A. The rear flange portion 28E is formed in a substantially U shape with the front side of the vehicle opened when viewed from the upper side of the vehicle. The front flange portion 28D and the rear flange portion 28E are configured to include attachment portions 28X and 28Y of the rear mount 28 with respect to the rear cross portion 22R of the suspension member 22.

  On both the left and right sides of the front flange portion 28D, slit portions 50 (notches) serving as a movement allowing portion opened to the front side of the vehicle with the longitudinal direction of the vehicle as the longitudinal direction are formed to penetrate. Similarly, slit portions 52 (notches) serving as movement-permitting portions that open to the front side of the vehicle with the longitudinal direction of the vehicle as the longitudinal direction are also formed through both the left and right sides of the rear flange portion 28E. Bolt insertion holes 22X and 22Y (see FIG. 5) are formed through the upper wall portion 22r of the rear cross portion 22R of the suspension member 22 so as to correspond to the vehicle rear side ends of the slit portions 50 and 52. .

  As shown in FIG. 5, weld nuts 56 and 58 are fixed in advance to the outer peripheral portions of the bolt insertion holes 22X and 22Y on the back surface (the surface facing the vehicle lower side) of the upper wall portion 22r of the rear cross portion 22R. ing. Then, the bolts 60 and 62 are inserted from the vehicle upper side to the rear end side of the slit portions 50 and 52 and the bolt insertion holes 22X and 22Y in this order and screwed into the weld nuts 56 and 58, whereby the front flange portion 28D and The rear flange portion 28E is fixed to the upper wall portion 22r of the rear cross portion 22R of the suspension member 22. The above-described slit portions 50 and 52 are set in the mounting portions 28X and 28Y of the rear mount 28, so that when a load F of a predetermined value or more is input to the connecting portion 40 from the front side of the vehicle, the suspension member 22 Relative movement of the connecting portion 40 with respect to the rear cross portion 22R toward the vehicle rear side (refer to the direction of the arrow RR) is allowed.

  Further, the inclined surface 38Y formed on the bracket 38 of the connecting portion 40 is located on the vehicle upper side with respect to the rear mount 28 when the connecting portion 40 moves relative to the rear cross portion 22R of the suspension member 22 toward the vehicle rear side. A part of the part is set to contact the steering gear box 34. In the figure, a state in which the inclined surface 38Y of the bracket 38 is in contact with the steering gear box 34 is indicated by a two-dot chain line.

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  In the present embodiment, the slits 50 and 52 (see FIG. 4) are set in the attachment portions 28X and 28Y of the rear mount 28 with respect to the suspension member 22, so that the load F on the connecting portion 40 is a predetermined value or more from the front side of the vehicle. Is input, the relative movement of the connecting portion 40 with respect to the suspension member 22 toward the vehicle rear side is allowed. For this reason, when the connecting part 40 is pushed to the rear side of the vehicle with the load F of the predetermined value or more together with the power unit 12 at the time of a frontal collision of the vehicle, the connecting part 40 moves relative to the rear side of the vehicle with respect to the suspension member 22. Forty rear mounts 28 are detached from the suspension member 22. In addition, since the movement permissible portions (slit portions 50 and 52 in this embodiment) for the relative movement are set in the attachment portions 28X and 28Y of the rear mount 28 with respect to the suspension member 22, the degree of freedom in design is increased. Relatively high.

  Further, the connecting portion 40 is configured to include a part of a bracket 38 that is disposed close to the front side of the vehicle with respect to the steering gear box 34, and the bracket 38 of the connecting portion 40 is located on the upper side of the vehicle. An inclined surface 38Y that contacts the steering gear box 34 when the connecting portion 40 moves relative to the suspension member 22 relative to the suspension member 22 is set. Has been. For this reason, after the bracket 38 is displaced to the vehicle rear side together with the power unit 12 that is a heavy object at the time of a frontal collision, the inclined surface 38Y of the bracket 38 contacts the steering gear box 34, and then the inclined surface 38Y of the bracket 38 is When displaced to the side, the steering gear box 34 is guided to the inclined surface 38Y and pushed up to the vehicle upper side.

  When the steering gear box 34 is pushed upward in this way, collision energy is absorbed, and interference (contact) between the steering gear box 34 and the stabilizer 36 or the like arranged on the vehicle rear side is caused. It can be suppressed. At this time, since the power unit 12 can be displaced to the space where the steering gear box 34 was originally disposed, the power unit 12 can be interfered (contacted) with the dash panel 15 through the member. The moving stroke is lengthened and the collision energy is effectively absorbed.

  Further, when the pushed-up steering gear box 34 breaks at the rear end surface 38Z (for example, the vertical surface 38X) of the side wall portion 38B of the bracket 38, the collision energy is absorbed at the time of the break, and the reaction against the connecting portion 40 after the breakage. The connecting portion 40 can be retracted while suppressing an increase in force.

  As described above, according to the vehicle front structure of the present embodiment, it is possible to effectively absorb the collision energy at the time of the frontal collision of the vehicle while ensuring the degree of freedom of design.

  In the present embodiment, the collision energy is effectively absorbed at the time of the frontal collision of the vehicle, so that the so-called bottom load when the power unit 12 interferes with the dash panel 15 via the member and the cabin (floor) at that time. ) Can be reduced.

(Supplementary explanation of the embodiment)
As a modification of the above-described embodiment, the connecting portion (bracket or mount) corresponding to the connecting portion 40 is configured to include a portion disposed close to the front side of the vehicle with respect to the stabilizer (36). The connecting portion is inclined toward the vehicle front side toward the vehicle upper side and is linear in a vehicle side view, and the connection portion is relative to the vehicle rear side with respect to the subframe (suspension member (22)). It is also possible to adopt a configuration in which an inclined surface that comes into contact with the stabilizer (36) when set is set.

  As another modified example, a portion where a connecting portion (bracket or mount) corresponding to the connecting portion 40 is disposed close to the front side of the vehicle with respect to each of the steering gear box (34) and the stabilizer (36) is provided. In addition, the connecting portion is inclined to the vehicle front side toward the vehicle upper side and is linear in a vehicle side view and is connected to the subframe (suspension member (22)). It is also possible to adopt a configuration in which inclined surfaces that respectively contact the steering gear box (34) and the stabilizer (36) are set when the portion moves relative to the vehicle rear side.

  Furthermore, as another modification, the mount corresponding to the rear mount 28 of the connecting portion 40 is configured to include a portion disposed close to the front side of the vehicle with respect to the steering gear box (34). The connecting portion (corresponding to the connecting portion 40) is inclined to the front side of the vehicle toward the vehicle upper side and is linear in a vehicle side view and includes the mount with respect to the subframe (suspension member (22)). It is also possible to adopt a configuration in which an inclined surface that comes into contact with the steering gear box (34) is set when the element) moves relative to the vehicle rear side.

  Moreover, in the said embodiment, although the sub-frame is made into the frame-shaped suspension member 22, a sub-frame is spanned linearly between the front side members (16), for example, and is extended in the vehicle width direction. A cross member such as a suspension member (not frame-shaped) may be used.

  Further, as a modification of the above embodiment, the flange portions corresponding to the front flange portion 28D and the rear flange portion 28E are penetrated in the vehicle vertical direction instead of the slit portions 50 and 52 and opened to the vehicle front side. A notch as a non-slit-shaped movement allowing portion may be formed.

  In addition, the said embodiment and the above-mentioned some modification can be implemented combining suitably.

  Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. .

10 Vehicle front 12 Power unit 14 Power unit room 22 Suspension member (subframe)
28 Rear mount (mount)
28X, 28Y Rear mount mounting part (Mount mounting part)
34 Steering gear box 36 Stabilizer 38 Bracket 38Y Inclined surface 40 Connection part 50, 52 Slit part (movement allowance part)

Claims (1)

A power unit that is disposed in a power unit chamber provided in the front of the vehicle and generates a driving force for the vehicle to travel;
A subframe located on the vehicle lower side of the power unit;
A portion disposed on the vehicle rear side of the power unit, connecting the power unit and the sub frame, and disposed adjacent to the vehicle front side with respect to at least one of a steering gear box and a stabilizer attached to the sub frame. And a bracket that is fixed to the rear end of the power unit in the vehicle front-rear direction and a mount that is attached to the upper surface side of the subframe and supports the power unit via the bracket. When,
Have
A movement that allows relative movement of the connecting portion relative to the sub frame toward the vehicle rear side when a load greater than or equal to a predetermined value is input to the connecting portion from the vehicle front side to the mounting portion of the mount relative to the sub frame. The tolerance part is set,
The connecting portion is inclined to the vehicle front side toward the vehicle upper side and is linear in a vehicle side view, and at least when the connection portion moves relative to the subframe relative to the vehicle rear side. The vehicle front part structure in which the inclined surface which contact | abuts one side is set.

Images