JP6515785B2 - Vehicle substructure - Google Patents

Description

  The present invention relates to a vehicle lower structure including a suspension member supported by a vehicle body frame and a mounting device provided on the suspension member for supporting an engine from the rear side of the vehicle.

  The lower structure of the vehicle described in Patent Document 1 includes a pair of side members extending substantially in the front-rear direction of the vehicle and a cross member extending in the vehicle width direction. One end of the cross member in the longitudinal direction is connected to a midway position of one side member in the longitudinal direction of the vehicle of the pair of side members, and the longitudinal position of the cross member is midway in the longitudinal direction of the other side member The other end in the direction is connected.

  In the lower structure of the vehicle of the same document 1, when the collision energy resulting from the collision between the front of the vehicle and the obstacle is input to the front of the side member, the side member is deformed. There is. At this time, collision energy is also input to the engine, and the engine moves to the rear of the vehicle. Then, when the cross member is pushed by the engine moving to the rear of the vehicle in this manner, a load associated with the movement of the engine to the rear of the vehicle is applied to the connecting portion connecting the cross member and the side member, and the connecting portion is broken. And the cross member can be removed from the side member. As a result, the movement of the engine to the rear of the vehicle is not impeded by the cross member, and thus the deformation of the vehicle front of the side member is not impeded by the engine or the like.

  Further, as a lower structure of a vehicle, for example, a structure as shown in FIG. 8 is also known. That is, as shown in FIG. 8, the lower structure of the vehicle includes a suspension member 210 supported by a vehicle body frame 201. The front portion of the vehicle body frame 201 is provided with an impact absorbing portion 202 for absorbing the collision energy. The impact energy is absorbed by the deformation of the impact absorbing portion 202.

  The front of the vehicle of suspension member 210 is located forward of the rear end of the vehicle of impact absorbing portion 202, and the front of the vehicle of suspension member 210 is connected to impact absorbing portion 202 via front side connecting portion 220. There is. Further, the vehicle rear portion of the suspension member 210 is located rearward of the engine 230, and the vehicle rear portion of the suspension member 210 is connected to the vehicle body frame 201 via the rear connection portion 240.

  The lower structure shown in FIG. 8 is provided with a mounting device 250 for supporting the engine 230 from the rear side of the vehicle. The mounting device 250 includes a bracket 251 fixed to the engine 230, a vibration damping portion 252 for damping vibration from the engine 230 inputted through the bracket 251, and the vibration damping portion 252 as the suspension member 210. And a fixing member 253 for fixing.

JP, 2005-112197, A

  In order to cause the impact absorbing portion 202 of the vehicle body frame 201 to sufficiently exhibit the function of absorbing the collision energy, it is necessary to secure a deformation amount of the impact absorbing portion 202, that is, a crushable stroke. In the lower structure shown in FIG. 8, when the rear connection portion 240 is broken when the shock absorbing portion 202 is deformed by the input of the collision energy, the suspension member 210 is deformed according to the deformation of the shock absorbing portion 202. Will be displaced to the rear of the vehicle. Therefore, by releasing the connection between the rear portion of the suspension member 210 and the vehicle body frame 201, the deformation of the shock absorbing portion 202 is less likely to be inhibited by the suspension member 210.

  Incidentally, when the above-mentioned collision energy is input to the shock absorbing portion 202 of the vehicle body frame 201 and the shock absorbing portion 202 is deformed, the vehicle of the suspension member 210 connected to the shock absorbing portion 202 via the front connection portion 220. The collision energy is also input to the front. Therefore, a load F is applied to the rear connection portion 240 connecting the vehicle rear portion of the suspension member 210 and the vehicle body frame 201 via the suspension member 210.

  However, as shown in FIG. 9, the suspension member 210 may be deformed due to the above-described collision energy being input. As described above, when the suspension member 210 is deformed, a part of the impact energy is absorbed by the deformation, so that the above-described load F applied to the rear connection portion 240 is reduced. When the load F applied to the rear connection portion 240 is small, the rear connection portion 240 is not broken and the connection between the vehicle rear portion of the suspension member 210 and the vehicle body frame 201 via the rear connection portion 240 is May be maintained. In this case, since the suspension member 210 can not be displaced to the rear of the vehicle according to the deformation of the shock absorbing portion 202, the deformation of the shock absorbing portion 202 is inhibited by the suspension member 210 and absorption of collision energy by the shock absorbing portion 202 There is a possibility that the function may not be fully exhibited.

  The object of the present invention is to break the rear connection part connecting the rear part of the suspension member to the vehicle body frame when the vehicle collides with an obstacle at the front part, thereby causing the collision by the shock absorbing part of the vehicle body frame An object of the present invention is to provide a vehicle undercarriage that can fully exhibit the energy absorption function.

  The lower structure of the vehicle for solving the above problems includes a vehicle body frame provided with a shock absorbing portion at the front of the vehicle, a suspension member, and a front connecting portion connecting the vehicle front of the suspension member and the shock absorbing portion. And a rear side connecting portion for connecting the suspension member and the vehicle body frame on the rear side of the vehicle than the engine, and a mount located on the rear side of the vehicle than the engine and attached to the suspension member and supporting the engine from the rear side of the vehicle And an apparatus. In the lower structure of the vehicle, the mounting device includes a bracket fixed to the engine, a vibration damping portion for damping vibration from the engine input through the bracket, and a vibration damping portion fixed to the suspension member. And a fixing member. Further, the bracket is located on the front side of the vehicle with respect to the vibration damping portion and the fixing member, and has a portion facing the fixing member in the longitudinal direction of the vehicle. In addition, at least one of the opposing portions facing each other in the vehicle longitudinal direction in the fixing member and the bracket is provided with a projecting portion that protrudes toward the other. The fixing member is brought into contact with the bracket via the projection by the displacement of the bracket to the rear of the vehicle due to the movement of the engine to the rear of the vehicle due to the collision between the front portion of the vehicle and the obstacle. ing.

  When the impact absorbing portion provided on the vehicle front of the vehicle body frame is deformed due to the vehicle colliding with an obstacle at the front, collision energy resulting from the collision is also input to the suspension member. Therefore, a load (hereinafter, also referred to as a "first load") is applied to the rear connection portion connecting the suspension member and the vehicle body frame through the suspension member.

  In addition, when a collision that deforms the shock absorbing portion occurs at the front of the vehicle, the engine moves to the rear of the vehicle due to the collision. When the load (hereinafter also referred to as “second load”) associated with the movement of the engine to the rear of the vehicle is also applied to the rear connection portion, the first load applied to the rear connection portion is small. Even in the case, it is easy to break the rear connection portion.

  In the above-mentioned configuration, the above-mentioned projecting portion is provided on at least one of the facing portions of the fixing member and the bracket facing each other in the vehicle longitudinal direction. As a result, when the engine moves to the rear of the vehicle due to the vehicle colliding with the obstacle at the front, the bracket is displaced to the rear of the vehicle, and the bracket abuts on the fixing member via the projection. The suspension member to which the fixing member is attached is pushed by the engine to the rear of the vehicle. As a result, the second load is applied to the rear connection portion through the suspension member. Further, as described above, when the impact absorbing portion of the vehicle body frame is deformed, the first load is also applied to the rear side connecting portion via the suspension member. Therefore, as compared with the case where the second load is not applied to the rear side connecting portion, the total of the loads applied to the rear side connecting portion becomes large, and thus the rear side connecting portion is easily broken. Then, when the rear connection portion is broken, the connection between the vehicle rear portion of the suspension member and the vehicle body frame via the rear connection portion is cancelled. As a result, the suspension member is easily displaced to the rear of the vehicle according to the deformation of the shock absorbing portion, and therefore the deformation of the shock absorbing portion is less likely to be inhibited by the suspension member.

  Therefore, when the vehicle collides with an obstacle at the front, the rear side connection portion connecting the rear portion of the suspension member to the vehicle body frame is broken to absorb the collision energy by the impact absorbing portion of the vehicle body frame. Will be able to make full use of

BRIEF DESCRIPTION OF THE DRAWINGS The side view which shows typically one Embodiment of the lower structure of a vehicle, and the structure of the periphery of it. The perspective view which shows schematic structure of the suspension member which comprises the lower structure of the vehicle. Sectional drawing which shows the rear side connection part which comprises the lower structure of the vehicle, and its periphery member. Sectional drawing which shows the mounting apparatus which comprises the lower structure of the vehicle, and a part of suspension member. FIG. 7 is an operation view showing a state in which a shock absorber of a vehicle body frame and a suspension member are deformed due to a front part of a vehicle colliding with an obstacle; (A) is a side view showing that the connection portion between the bracket and the vibration damping part is broken in the mounting apparatus, (b) is a side view showing that the bracket is in contact with the fixing member via the projecting part, c) is a side view showing a state in which the rear connection portion is deformed due to the load caused by the movement of the engine to the rear of the vehicle. Sectional drawing which shows typically a mode that the back side connection part fractured | ruptured. The side view which shows the lower structure of the conventional vehicle typically. FIG. 12 is an operation view showing a state in which a shock absorber of a vehicle body frame and a suspension member are deformed due to a front part of a vehicle colliding with an obstacle in a lower structure of a conventional vehicle.

Hereinafter, one embodiment of the lower structure of the vehicle will be described according to FIGS. 1 to 7.
As shown in FIG. 1, the vehicle lower structure of the present embodiment includes a suspension member 20 supported by a vehicle body frame 10. The front portion of the vehicle body frame 10 is provided with an impact absorbing portion 11 for absorbing collision energy caused by the front portion of the vehicle colliding with an obstacle. The impact absorbing portion 11 has a crash box 12 and a bending deformation portion 13 disposed on the vehicle rear side of the crash box 12. The crash box 12 can absorb collision energy by deforming in such a manner that the length in the longitudinal direction of the vehicle becomes short. Further, by bending, the bending deformation portion 13 changes the direction in which load is applied due to the collision energy input through the crash box 12 and suppresses the deformation of the vehicle body frame 10.

  As shown in FIGS. 1 and 2, the suspension member 20 includes a pair of side member portions 21 disposed on both sides in the vehicle width direction, and a cross member portion 22 extending in the vehicle width direction. The member portion 21 extends in the longitudinal direction of the vehicle. Further, the vehicle front end of the side member portion 21 is located on the vehicle front side of the bending deformation portion 13 and on the vehicle rear side of the vehicle front end of the crash box 12. Further, both ends in the longitudinal direction of the cross member portion 22 are respectively connected to middle positions in the vehicle longitudinal direction of the pair of side member portions 21.

  Further, the lower structure of the vehicle comprises a pair of front side connecting portions 30 connecting the vehicle front portion of the side member portion 21 and the shock absorbing portion 11 of the vehicle body frame 10, the vehicle rear portion of the side member portion 21 and the vehicle body frame 10 And a pair of rear side connecting portions 40 to be connected.

  The structure of the rear side connection part 40 is shown in figure by FIG. As shown in FIG. 3, the rear side connection portion 40 is provided with a cylindrical support portion 41 fixed to the suspension member 20 and a shaft member 42 extending in the vehicle vertical direction. The shaft member 42 is supported by the support portion 41, and the upper end of the shaft member 42 protrudes upward from the support portion 41. The upper end of the shaft member 42 is fixed to the vehicle body frame 10.

  As shown in FIGS. 1 and 4, the lower structure of the vehicle is provided with a mounting device 50 located on the rear side of the vehicle than the engine 100 and supporting the rear portion of the engine 100. The mounting device 50 is disposed at a halfway position (for example, the center) in the longitudinal direction of the cross member portion 22. The mounting device 50 includes a bracket 51 fixed to the engine 100, a vibration damping portion 52 for damping vibration from the engine 100 input through the bracket 51, and a lock for fixing the vibration damping portion 52 to the suspension member 20. And a member 53. The vibration damping portion 52 includes a cylindrical portion 521 in which an impact absorbing material such as rubber is accommodated and a cylindrical portion 521 via the impact absorbing material in a state where it can be displaced in the vehicle longitudinal direction and the vehicle width direction. A supported vibrating portion 522 is provided. The vibrating portion 522 has a shaft portion projecting downward in the vehicle, and the shaft portion is supported by the cylindrical portion 521 via an impact absorbing material.

  The fixing member 53 is provided with a main body portion 531 having an arc shape in top view and an attached portion 532 radially extending from the lower end of the main body portion 531. The main body portion 531 supports the cylindrical portion 521 of the vibration damping portion 52. Further, the mounting portion 532 is fixed to the suspension member 20 by bolt fastening or the like.

  The bracket 51 is located forward of the main body portion 531 of the fixing member 53 in the vehicle, and is connected to the vibrating portion 522 of the vibration damping portion 52. The bracket 51 is configured to extend downward from the connecting portion with the vibrating portion 522. The lower portion of the bracket 51 is opposed to the main body 531 of the fixing member 53 in the vehicle longitudinal direction.

  Further, as shown in FIG. 4, at a portion of the main body portion 531 of the fixing member 53 facing the lower portion of the bracket 51 in the vehicle longitudinal direction, a projecting portion 54 projecting toward the bracket 51 located forward of the vehicle is provided ing. The projecting portion 54 is disposed closer to the upper end than the lower end of the main body portion 531, and is not in contact with the bracket 51.

  In the present embodiment, the protruding portion 54 is formed in a substantially U-shape in a side view by bending the both end portions of one plate material. Specifically, the protrusion 54 has a base 542, a first extension 543 extending to the rear of the vehicle from the upper end of the base 542, and a second extension extending to the rear of the vehicle from the lower end of the base 542 And a portion 544. The rear end of the vehicle of each of the extension portions 543 and 544 is fixed to the main portion 531 of the fixing member 53 by welding or the like.

  Next, with reference to FIGS. 5 to 7, an operation when the front part of the vehicle collides with an obstacle will be described. 6 (a), (b) and (c), illustration of the vehicle body frame 10 is omitted for convenience of explanation.

  As shown in FIG. 5, when the collision energy resulting from the collision between the front part of the vehicle and the obstacle is input to the shock absorbing unit 11, the suspension connected to the shock absorbing unit 11 via the front connection unit 30. The collision energy is also input to the member 20. Then, a first load F <b> 1 which is a load based on the collision energy is applied to the rear connection portion 40 via the suspension member 20.

  When the collision energy is input to the suspension member 20 as described above, the side member portion 21 of the suspension member 20 may be deformed by the collision energy. Specifically, the side member portion 21 is deformed in such a manner that a portion located on the vehicle rear side of the front connection portion 30 and on the vehicle front side of the mounting device 50 is displaced downward.

  In addition, when the impact absorbing portion 11 is deformed by the input of the collision energy, the collision energy is also input to the engine 100, and the engine 100 moves to the rear of the vehicle. As shown in FIG. 6A, when the engine 100 moves to the rear of the vehicle in this manner, the bracket 51 fixed to the engine 100 also starts to be displaced. As described above, when the bracket 51 starts to be displaced, a load is applied to the connection portion between the bracket 51 and the vibrating portion 522, and the connection portion is broken. Then, as shown in FIG. 6 (b), the bracket 51 moves integrally with the engine 100 to the rear of the vehicle and abuts on the main body 531 of the fixing member 53 via the projection 54.

  As shown in FIG. 5 and FIG. 6B, in the suspension member 20, the attachment portion, which is the portion to which the mounting device 50 is attached, is displaced downward of the vehicle by the input of the collision energy. On the other hand, since the bracket 51 is separated from the mounting device 50, the position of the bracket 51 in the vehicle vertical direction is not displaced downward. That is, the protrusion 54 provided on the fixing member 53 is displaced relative to the bracket 51 in the lower direction of the vehicle. However, the protrusion 54 is fixed relatively upward in the main body 531 of the fixing member 53. Therefore, even if the mounting portion is displaced downward, the bracket 51 fixed to the engine 100 can be made to abut on the fixing member 53 via the projection 54.

  When the bracket 51 abuts on the fixing member 53 via the projection 54 in this manner, the suspension member 20 is pushed by the engine 100 rearward of the vehicle. As a result, the second load F2, which is a load accompanying the movement of the engine 100 to the rear of the vehicle, is transmitted to the suspension member 20. Then, as shown in FIG. 7, not only the first load F1 but also the second load F2 is applied to the rear side connecting portion 40 connecting the suspension member 20 to the vehicle body frame 10. As a result, as shown in FIG. 6C and FIG. 7, the shaft member 42 of the rear connection portion 40 is deformed, and thereafter, the shaft member 42 is broken.

  Then, when the shaft member 42 of the rear side connecting portion 40 is broken, the connection between the vehicle rear portion of the suspension member 20 and the vehicle body frame 10 via the rear side connecting portion 40 is cancelled. As a result, in response to the deformation of the shock absorbing portion 11, the suspension member 20 is displaced rearward of the vehicle. As a result, the shock absorbing portion 11 is deformed without being blocked by the suspension member 20.

As described above, according to the above configuration and operation, the following effects can be obtained.
(1) When a collision with an obstacle occurs at the front of the vehicle, the rear connection 40 receives the first load F1 and the second load F2. By thus increasing the total load applied to the rear connection portion 40, the shaft member 42 of the rear connection portion 40 can be easily broken. Then, when the rear connection portion 40 is broken, the suspension member 20 is displaced to the rear of the vehicle according to the deformation of the impact absorbing portion 11. Therefore, the impact energy absorbing function of the impact absorbing portion 11 of the vehicle body frame 10 can be sufficiently exhibited.

  (2) The second load F2 associated with the movement of the engine 100 to the rear of the vehicle at a stage where the amount of movement of the engine 100 to the rear of the vehicle is smaller than in the case where the fixed member 53 is not provided with the protrusion 54 Is added to the rear connection portion 40 via the fixing member 53 and the suspension member 20. Therefore, the rear connection portion 40 can be broken early.

The above embodiment may be changed to another embodiment as described below.
The mounting device 50 may have a configuration in which a protrusion is provided on the bracket 51 instead of the fixing member 53. In this case, it is preferable to provide a protrusion at the lower part of the bracket 51 facing the main body 531 of the fixing member 53 in the vehicle longitudinal direction. In this configuration, when the bracket 51 is displaced to the rear of the vehicle together with the engine 100 due to the input of the impact energy, the bracket 51 abuts on the fixing member 53 via the projecting portion, and as a result, the second load F2 is mounted on the mounting device 50. And the suspension member 20 to the rear connecting portion 40. Therefore, the same effect as the above (1) and (2) can be obtained.

  The mounting device 50 may be provided with protrusions that come in contact with each other at the time of a collision between the front portion of the vehicle and an obstacle, on both the fixing member 53 and the bracket 51. In this case, when the bracket 51 is displaced to the rear of the vehicle together with the engine 100 due to the input of the impact energy, the bracket 51 abuts on the fixing member 53 via the projections provided on both the bracket 51 and the fixing member 53. Become. As a result, the second load F 2 is transmitted to the rear connection portion 40 via the mounting device 50 and the suspension member 20. Therefore, even with such a configuration, the same effects as the above (1) and (2) can be obtained.

  The mounting device 50 breaks the connection portion even if a load is applied to the connection portion between the bracket 51 and the vibrating portion 522 due to the movement of the engine 100 to the rear of the vehicle due to the collision between the front portion of the vehicle and the obstacle. The configuration may not be Even in such a case, when the bracket 51 is displaced rearward with the movement of the engine 100 to the rear of the vehicle, the bracket 51 abuts on the fixing member 53 via the projection 54, and the second load F2 is generated. Can be applied to the rear connection portion 40. Therefore, the same effect as the above (1) and (2) can be obtained.

  The mounting device 50 includes a connecting portion that connects the bracket 51 and the vibrating portion 522, and the connecting portion is configured to release the connection between the bracket 51 and the vibrating portion 522 when a load equal to or greater than a specified value is applied. May be In this case, the bracket 51 is separated from the vibrating portion 522 when a load equal to or greater than a specified value is applied to the connecting portion due to the movement of the engine 100 to the rear of the vehicle due to a collision between the front portion of the vehicle and the obstacle. It will move to the rear of the vehicle with the As a result, the second load F2 is applied to the rear side connecting portion 40, and the rear side connecting portion 40 is broken.

  DESCRIPTION OF SYMBOLS 10 Vehicle body frame 11 Shock absorption part 20 Suspension member 30 Front connection part 40 Rear connection part 50 Mount apparatus 51 Bracket 52 Vibration damping part 53 Fixing member 54 ... protrusion, 100 ... engine.

Claims (1)

A vehicle body frame provided with a shock absorbing portion at the front of the vehicle, a suspension member, a front connecting portion connecting the vehicle front of the suspension member and the shock absorbing portion, and the suspension at the vehicle rear side of the engine A rear side connecting portion connecting the member and the vehicle body frame; and a mounting device located at the rear of the vehicle with respect to the engine and attached to the suspension member and supporting the engine from the rear side of the vehicle.
The mounting device includes a bracket fixed to the engine, a vibration damping portion for damping vibration from the engine inputted through the bracket, and a fixing member for fixing the vibration damping portion to the suspension member And have
The bracket is positioned on the front side of the vehicle with respect to the vibration damping unit and the fixing member, and has a portion facing the fixing member in the longitudinal direction of the vehicle.
Among the brackets, a portion that is located on the vehicle front side with respect to the vibration damping unit and the fixing member, and that is opposed to the fixing member in the vehicle longitudinal direction is fixed to the engine.
At least one of the opposing portions of the fixing member and the bracket that are opposed to each other in the vehicle longitudinal direction is provided with a projecting portion that protrudes toward the other,
The fixing member is brought into contact with the bracket via the projecting portion by displacing the bracket to the rear of the vehicle by the movement of the engine to the rear of the vehicle due to a collision between a front portion of the vehicle and an obstacle. The undercarriage of the vehicle has become.

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