JP2012166611A - Structure coping with crash of vehicle rear part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the safety of an occupant in a vehicle interior by effectively absorbing an impact load applied from a vehicle rear side.SOLUTION: This structure coping with the crash of a vehicle rear part includes: a pair of right and left rear side frames 2, 3 extending in a vehicle front/back direction in a vehicle rear part; a rear bumper 4 extended in the vehicle width direction behind the rear side frames 2, 3; and a hollow exhaust silencer 30 arranged in an exhaust path 28 of an engine and installed at a position overlapping the rear side frames 2, 3 in the vehicle front/back direction where a load transmission member 52 for transmitting an impact load applied on the rear bumper 4 from the vehicle rear side to the exhaust silencer 30 is arranged behind the exhaust silencer 30, and the exhaust silencer 30 pressing to the front side by the load transmission member 52 is received by a reception member including a vehicle body constituent member arranged in front of the exhaust silencer 30.

Description

  The present invention relates to a collision handling structure at the rear of a vehicle for absorbing an impact load applied from the rear of the vehicle.

  As a safety measure in the event of a vehicle collision, a technology that absorbs the impact load applied to the vehicle at the time of the collision by collapsing a part of the vehicle body such as a side frame is generally known. The transmitted impact can be mitigated, which increases the safety of the passenger.

  For example, in the case of a frontal collision, first, the crash can provided across the front end of the front side frame and the front bumper is crushed, so that the impact load is absorbed by the crash can and the impact load that cannot be absorbed by this crash can. Further, there is known a technique for absorbing the front side frame by collapsing.

  In addition to the above, various technologies have been developed as disclosed in Patent Documents 1 and 2 and the like regarding the collision-responsive structure at the front of the vehicle.

  For example, in the technique of Patent Document 1, the sub-bumper beam provided at the front end portion of the vehicle corresponds to the vehicle body portion at the rear end portion of the front vehicle by operating an actuator in an emergency in which a collision with the front vehicle is predicted. The collision energy is efficiently absorbed by being lowered to a height and causing the sub-bumper beam to collide with the vehicle body of the preceding vehicle.

  Further, in the technique of Patent Document 2, by operating a screw mechanism in an emergency in which a collision with a preceding vehicle is predicted, the sub-bumper beam is lowered in the same manner as in the technique of Patent Document 1, and the sub-bumper beam is moved forward. It is made to collide with the vehicle body.

  On the other hand, with regard to countermeasures for rear collision, for example, first, the crash can provided across the rear end portion of the rear side frame and the rear bumper is crushed, so that the impact load is absorbed by the crash can and can be absorbed thereby. There is known a technique in which a shock load that is not absorbed is absorbed by further crushing the rear side frame.

  Further, as another structure for dealing with a collision at the rear of the vehicle, Patent Document 3 discloses a technique for improving the safety of the occupant of the rear seat by sliding the rear seat forward when the rear vehicle collides. Has been.

JP 2007-203807 A JP 2007-203808 A JP-A-11-208337

  However, as a countermeasure against a rear collision, there is a case where the impact load cannot be absorbed sufficiently only by the crash can and the rear side frame at the rear part of the vehicle. Therefore, development of a technique for absorbing the impact load more effectively is required. .

  Further, the technique of Patent Document 3 is to move the occupant of the rear seat to the front in order to move away from the collision part at the time of a rear collision, and is not intended to effectively absorb the impact load. The impact cannot be reduced.

  Then, this invention makes it a subject to provide the collision response structure of the vehicle rear part which can improve the safety | security of the passenger | crew in a vehicle interior by absorbing effectively the impact load added from the vehicle rear.

  In order to solve the above-mentioned problems, the rear-vehicle collision response structure according to the present invention is configured as follows.

First, the invention according to claim 1 of the present application is
A pair of left and right rear side frames extending in the vehicle longitudinal direction at the rear of the vehicle;
A rear bumper extending in the vehicle width direction behind the rear side frame;
A collision-reducing structure for a rear portion of a vehicle having a hollow exhaust silencer provided in an exhaust path of an engine and disposed at a position overlapping the rear side frame and the vehicle longitudinal direction,
A load transmission member disposed behind the exhaust silencer and transmitting an impact load applied to the rear bumper from the rear of the vehicle to the exhaust silencer;
It is a vehicle body constituent member arranged in front of the exhaust silencer, and has a receiving member for receiving the exhaust silencer pushed forward by the load transmission member.

The invention according to claim 2 is the invention according to claim 1,
The receiving member is a rear suspension cross member constructed between the left and right rear side frames in front of the exhaust silencer.

Further, the invention according to claim 3 is the invention according to claim 1 or 2,
The exhaust silencer is provided at a position lower than a rear bumper reinforcement provided inside the rear bumper,
The load transmission member extends downward from the rear bumper reinforcement so that it can contact the rear end of the exhaust silencer when an impact load is applied to the rear bumper from the rear of the vehicle. And a support portion extending forward from the contact portion so that the bottom portion of the exhaust silencer can be supported in a state where the corresponding contact portion is in contact with the rear end portion of the exhaust silencer. Features.

Furthermore, the invention according to claim 4 is the invention according to claim 3,
Crash cans that absorb the impact load while being crushed when an impact load is applied to the rear bumper from the rear of the vehicle are provided across the rear end of each rear side frame and the rear bumper reinforcement, respectively.
The load transmitting member is disposed between the abutting portion and a rear end portion of the exhaust silencer after the crash can is crushed when an impact load is applied to the rear bumper from the rear of the vehicle. It is characterized in that it is arranged with an interval necessary for contacting the silencer.

The invention according to claim 5 is the invention according to claim 3 or 4,
The load transmission member is arranged so that a front end portion of the support portion overlaps with the exhaust silencer in a vehicle front-rear direction when an impact load is not applied to the rear bumper.

The invention according to claim 6 is the invention according to any one of claims 3 to 5, wherein
The load transmitting member is joined to the rear bumper reinforcement so that when the exhaust silencer is crushed between the load transmitting member and the receiving member, the load transmitting member is separated from the rear bumper reinforcement by a reaction force from the receiving member. It is characterized by.

Further, the invention according to claim 7 is the invention according to any one of claims 1 to 6,
The exhaust silencer is suspended and supported by each rear side frame via a pair of front and rear hanger members,
The hanger member extends in the vehicle width direction to a frame side fixing member fixed to the rear side frame, a silencer side fixing member fixed to the exhaust silencer, and the frame side fixing member and the silencer side fixing member, respectively. A connecting member connected rotatably about an axis;
In the hanger member on the front side, the silencer side fixing member is fixed to a front portion of the exhaust silencer, and a connecting portion between the silencer side fixing member and the connecting member is formed by the frame side fixing member and the connecting member. Arranged below and in front of the connecting portion of
In the hanger member on the rear side, the silencer side fixing member is fixed to a rear portion of the exhaust silencer, and a connecting portion between the silencer side fixing member and the connecting member includes the frame side fixing member and the connecting member. It is arranged below and behind the connecting part.

The invention according to claim 8 is the invention according to claim 1 or 2, wherein
A tie-down hook is provided on the lower surface of the rear side frame so as to protrude downward.
The tie-down hook is provided with the load transmission member.

The invention according to claim 9 is the invention according to claim 8,
The load transmitting member includes a contact portion disposed at the rear of the exhaust silencer so as to be able to contact the rear end portion of the exhaust silencer when an impact load is applied to the rear bumper from the rear of the vehicle. The exhaust silencer extends forward from the contact portion in the vehicle width direction outer side than the exhaust silencer so as to restrict the exhaust silencer from moving outward in the vehicle width direction when the portion is in contact with the exhaust silencer. And a restricting portion.

  According to the first aspect of the present invention, when an impact load is applied to the rear bumper from the rear of the vehicle, the impact load is transmitted to the exhaust silencer by the load transmission member disposed behind the exhaust silencer, and the load The exhaust silencer pushed forward by the transmission member is received by a receiving member provided in front of the exhaust silencer. For this reason, the exhaust silencer can be sandwiched between the receiving member and the load transmitting member and crushed, thereby effectively absorbing the impact load.

  According to the invention described in claim 2, since a rear suspension cross member is used as the receiving member, it is not necessary to use a new member as the receiving member. Therefore, an increase in the number of parts and an increase in vehicle weight can be avoided.

  Furthermore, according to the third aspect of the present invention, when an impact load is applied to the rear bumper from the rear of the vehicle, the load transmission member of the load transmission member is in a state where the contact portion of the load transmission member is in contact with the rear end portion of the exhaust silencer. By supporting the bottom portion of the exhaust silencer by the support portion, it is possible to prevent the exhaust silencer from dropping downward, and thus the exhaust silencer can be reliably pressed against the receiving member by the load transmitting member.

  Furthermore, when the invention according to claim 4 is applied to the invention according to claim 3, after the crash can straddling the rear side frame and the rear bumper reinforcement is crushed, the contact portion of the load transmitting member becomes the exhaust silencer. Therefore, after the impact load is absorbed by the crash can, the impact load can be absorbed by the exhaust silencer. For this reason, when the impact load is small enough to cope with the crash can alone, damage to the exhaust silencer can be avoided.

  Further, when the invention according to claim 5 is applied to the invention according to claim 3 or claim 4, when the impact load starts to be applied to the rear bumper from the rear of the vehicle, the exhaust silencer is supported by the support portion of the load transmission member. Since the bottom portion can be supported, the exhaust silencer can be more reliably prevented from falling off.

  Furthermore, when the invention according to claim 6 is applied to the invention according to any one of claims 3 to 5, when the load transmission member crushes the exhaust silencer with the receiving member, In addition, since the reaction force from the receiving member separates and falls from the rear bumper reinforcement, when the impact load is continuously applied from the rear of the vehicle after the absorption of the impact load by the exhaust silencer is completed, the load transmitting member becomes the receiving member. Can be avoided, so that it is possible to continue shock absorption due to the rear side frame being crushed.

  According to the seventh aspect of the present invention, of the pair of front and rear hangers used to suspend and support the exhaust silencer by the rear side frame, the front hanger member connects the silencer side fixing member and the connecting member. Is disposed below and in front of the connecting portion between the frame side fixing member and the connecting member, and in the rear hanger member, the connecting portion between the silencer side fixing member and the connecting member is connected to the frame side fixing member. Since the exhaust hanger member is subjected to an impact load from the rear, the connection part between the silencer side fixing member and the connection member is a frame when the exhaust load is applied to the exhaust silencer from the rear. The connecting part between the side fixing member and the connecting member pivots forward and upward, and the connecting part between the silencer side fixing member and the connecting member is fixed to the frame side in the rear hanger member. It pivots forward and downward the connecting portion between the timber and the coupling member as a central axis. Therefore, the exhaust silencer is pushed forward by the load transmitting member in a state where the front end is lifted higher than the rear end. Therefore, when the exhaust silencer is pushed forward by the load transmitting member, the height of the front end portion of the exhaust silencer is maintained as much as possible, so that the front end portion can be reliably received by the receiving member.

  According to the eighth aspect of the present invention, since the load transmitting member is provided on the tie-down hook projecting downward from the lower surface of the rear side frame, the impact on the exhaust silencer using the tie-down hook is provided. A load can be realized.

  Further, according to the invention described in claim 9, when an impact load is applied to the rear bumper from the rear of the vehicle, in a state where the contact portion of the load transmission member is in contact with the exhaust silencer, Since the movement of the exhaust silencer to the outside in the vehicle width direction is restricted, the exhaust silencer can be reliably pressed against the receiving member by the load transmission member.

It is a bottom view which shows the vehicle rear part to which the collision response structure which concerns on the 1st Embodiment of this invention is applied. It is the sectional view on the AA line of FIG. It is a perspective view which shows the exhaust silencer and load transmission member in 1st Embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 in a state where an impact load starts to be applied to the rear bumper from the rear of the vehicle. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 in a state where the exhaust silencer is pushed forward until it abuts against a rear suspension cross member. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 in a state where an exhaust silencer is crushed and a load transmission member is dropped. It is the side view seen from the vehicle left side which shows the structure of a hanger member. It is the side view seen from the vehicle left side which shows the state of a hanger member when an impact load is added to the exhaust silencer from the vehicle rear side. It is the side view seen from the vehicle left side which shows the vehicle rear part to which the collision response structure which concerns on the 2nd Embodiment of this invention is applied. FIG. 10 is a bottom view of the rear part of the vehicle shown in FIG. 9. It is the side view seen from the vehicle left side which shows the state where the exhaust silencer was crushed in 2nd Embodiment. It is the side view seen from the vehicle right side which shows the vehicle rear part to which the collision response structure which concerns on the 3rd Embodiment of this invention is applied. It is a bottom view of the vehicle rear part shown in FIG. It is the BB sectional view taken on the line of FIG. It is a perspective view which shows the tie-down hook and load transmission member in 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described. In the following description, terms indicating directions such as “front”, “rear”, “front / rear”, “right”, “left”, “left / right”, etc. It shall indicate the direction when the traveling direction is “front”.

[First Embodiment]
FIG. 1 is a bottom view showing a rear portion of a vehicle 1 to which a rear-end collision-corresponding structure according to a first embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view taken along line AA in FIG. .

  As shown in FIGS. 1 and 2, a pair of left and right rear side frames 2 and 3 extending in the vehicle front-rear direction are provided at the rear portion of the vehicle 1. A cargo room floor material (not shown) is installed between the left and right rear side frames 2 and 3.

  A rear bumper 4 extends in the vehicle width direction behind the rear side frames 2 and 3. The rear bumper 4 includes a rear bumper reinforcement 6 that extends in the vehicle width direction, and a rear bumper cover (not shown) that covers the rear bumper reinforcement 6. The rear bumper reinforcement 6 includes a front-side member 8 having a hat-like cross section that opens toward the rear side of the vehicle, and a rear-side member 10 that is joined to the front-side member 8 so as to close the rear-side opening portion of the front-side member 8 Have

  Further, crash cans 12 and 13 are provided across the rear end portions of the rear side frames 2 and 3 and the rear bumper reinforcement provided in the rear bumper 4, respectively. A flange 14 is provided at the front ends of the crash cans 12 and 13, and the flanges 14 and flanges 16 provided at the rear ends of the rear side frames 2 and 3 are joined together, The rear side frames 2 and 3 are connected. When an impact load is applied to the rear bumper 4 from the rear of the vehicle, the impact can be transmitted to the vehicle body by first absorbing the impact load while the crash cans 12 and 13 are crushed.

  Further, a rear suspension cross member 20 is installed between the left and right rear side frames 2 and 3. The rear suspension cross member 20 constitutes a part of a suspension device for rear wheels, and includes a pair of left and right connecting member portions 22 and 23 respectively connected to the lower surfaces of the left and right rear side frames 2 and 3. And a horizontal member portion 24 laid between the connecting member portions 22 and 23. Each of the connecting member portions 22 and 23 is curved so as to bulge inward in the vehicle width direction, and both end portions of the connecting member portions 22 and 23 are fixed to the lower surfaces of the rear side frames 2 and 3.

  A hollow exhaust silencer 30 provided in the exhaust path 28 of the engine is disposed behind the rear suspension cross member 20. As shown in FIG. 1, the exhaust silencer 30 is disposed between the left and right rear side frames 2 and 3 in the vehicle width direction. Further, the exhaust silencer 30 is disposed at a position overlapping the rear side frames 2 and 3 in the vehicle front-rear direction. In the present embodiment, the rear end portion of the exhaust silencer 30 is disposed on the rear side of the rear ends of the rear side frames 2 and 3, but is located on the front side of the rear ends of the rear side frames 2 and 3. It may be arranged. Further, as shown in FIG. 2, the exhaust silencer 30 is provided at a position lower than the rear side frames 2 and 3 and the rear bumper reinforcement 6, and for example, the left and right rear sides via a pair of front and rear hanger members 60 and 62. Suspended and supported by frames 2 and 3. A specific configuration of the hanger members 60 and 62 will be described later.

  An inlet pipe 32 for introducing exhaust gas is provided at the front part of the exhaust silencer 30, and the inlet pipe 32 is connected to an exhaust pipe 50 extending rearward from the engine side. Further, outlet pipes 34 and 35 for discharging exhaust gas are provided at both ends of the exhaust silencer 30 in the vehicle width direction, and the exhaust gas that has passed through the exhaust silencer 30 passes through the outlet pipes 34 and 35. It is discharged to the rear of the vehicle.

  As shown in FIG. 3, the exhaust silencer 30 includes a flat cylindrical wall portion 38 extending in the vehicle width direction, a pair of left and right side wall plates 40, 42 that closes both end openings of the cylindrical wall portion 38, and an exhaust silencer. And partition plates 44 and 46 that divide 30 internal spaces in the vehicle width direction. The upper surface of the cylindrical wall portion 38 is a substantially horizontal surface, but the lower surface of the cylindrical wall portion 38 is an inclined surface that is inclined upward toward the rear (see FIG. 2). The side wall plates 40 and 42 and the partition plates 44 and 46 are formed in a step shape in plan view, and are folded so as to be shortened in the vehicle front-rear direction when an impact load is received from the vehicle rear side. It has become easier. Therefore, when the exhaust silencer 30 receives an impact load from the rear side of the vehicle, the exhaust silencer 30 is easily crushed so as to be compressed in the vehicle front-rear direction, so that the impact load can be effectively absorbed. It has become.

  As shown in FIGS. 2 and 3, for example, a pair of left and right load transmission members 52 that transmit an impact load applied to the rear bumper 4 from the rear of the vehicle to the exhaust silencer 30 are disposed behind the exhaust silencer 30. However, in the present invention, the number of load transmission members 52 is not particularly limited.

  The load transmission member 52 extends downward from the rear bumper reinforcement 6 so that it can contact the rear end of the exhaust silencer 30 when an impact load is applied to the rear bumper 4 from the rear of the vehicle. A support portion 56 that extends forward from the contact portion 54 so that the bottom portion of the exhaust silencer 30 can be supported in a state where the corresponding contact portion 54 is in contact with the rear end portion of the exhaust silencer 30. Have

  The contact part 54 is joined to the lower surface of the front member 8 of the rear bumper reinforcement 6 and extends forward and downward from the joined part. The upper end portion of the contact portion 54 and the rear bumper reinforcement 6 are joined by welding, for example, and this joining force is generated when the load transmission member 52 crushes the exhaust silencer 30 with the rear suspension cross member 20. In addition, the reaction force from the rear suspension cross member 20 is such that the rear bumper reinforcement 6 is separated from the rear bumper reinforcement 6. That is, since the load transmission member 52 falls off after absorbing the impact load by crushing the exhaust silencer 30 with the rear suspension cross member 20, the load transmission member 52 is continuously applied from the rear of the vehicle. It is possible to avoid the interference of 52 with the suspension cross member 20, and thus it is possible to continue the shock absorption due to the rear side frames 2 and 3 being crushed.

  A surface 55 of the contact portion 54 facing the rear end portion of the exhaust silencer 30 is disposed along a substantially vertical direction, so that when the facing surface 55 contacts the rear end portion of the exhaust silencer 30. The impact load applied from the rear of the vehicle can be efficiently transmitted from the load transmission member 52 to the exhaust silencer 30.

  Between the abutting portion 54 and the rear end portion of the exhaust silencer 30, the abutting portion 54 contacts the exhaust silencer 30 after the crash cans 12 and 13 are crushed when an impact load is applied to the rear bumper 4 from the rear of the vehicle. An interval d necessary for contact is provided. As a result, after the crash cans 12 and 13 are crushed, the contact portion 54 comes into contact with the exhaust silencer 30. Therefore, after the impact load is absorbed by the crash cans 12 and 13, the impact is caused by the exhaust silencer 30. The load can be absorbed. For this reason, when the impact load from the rear of the vehicle is small enough to cope with only the crash cans 12 and 13, damage to the exhaust silencer 30 can be avoided.

  The support portion 56 extends forward from the lower end portion of the contact portion 56, and at least the front end portion of the support portion 56 is disposed at a position lower than the lower end of the rear end portion of the exhaust silencer 30. As a result, the crash cans 12 and 13 are crushed by an impact load from the rear of the vehicle, and when the load transmission member 52 moves forward, the front end portion of the support portion 56 interferes with the rear end portion of the exhaust silencer 30. Therefore, the support portion 56 can be reliably disposed below the exhaust silencer 30. Therefore, the exhaust silencer 30 can be supported from the lower side by the support portion 56, thereby preventing the exhaust silencer 30 from falling off.

  The front end portion of the support portion 56 is disposed so as to overlap the exhaust silencer 30 in the vehicle front-rear direction. Therefore, since the bottom portion of the exhaust silencer 30 can be supported by the support portion 56 when an impact load starts to be applied to the rear bumper 4 from the rear of the vehicle, the exhaust silencer 30 can be more reliably prevented from falling off.

  A specific example of an aspect in which the impact load is absorbed at the rear portion of the vehicle 1 when an impact load is applied to the rear bumper 4 from the rear of the vehicle will be described with reference to FIGS.

  As shown in FIG. 4, when an impact load is applied to the rear bumper 4 from the rear of the vehicle, the crash cans 12 and 13 are first crushed and the impact loads are absorbed by the crash cans 12 and 13. When the impact load is relatively small, it can be dealt with only by the impact absorption by the crash cans 12 and 13. However, when the impact load is relatively large, the impact absorption is continued in the following manner.

  When the crash cans 12 and 13 are crushed so as to be compressed in the vehicle front-rear direction, the load transmitting member 52 is pushed forward, and the contact portion 54 of the load transmitting member 52 is moved to the rear end of the exhaust silencer 30. The load transmission to the exhaust silencer 30 by the load transmission member 52 is started.

  Subsequently, as shown in FIG. 5, as the rear side frames 2 and 3 start to be crushed and the rear side frames 2 and 3 are compressed in the vehicle front-rear direction, the load transmission member 52 further moves forward, and the exhaust Push the silencer 30 forward. At this time, since the bottom surface of the exhaust silencer 30 is supported from below by the support portion 56 of the load transmission member 52, the exhaust silencer 30 can be prevented from falling off. The exhaust silencer 30 pushed forward by the load transmitting member 52 is finally pressed against the rear member part 24 of the rear suspension cross member 20 in particular.

  Thereafter, as shown in FIG. 6, the exhaust silencer 30 is crushed by being sandwiched between the suspension cross member 20 and the load transmission member 52 in parallel with the rear side frames 2 and 3 being crushed. Thus, since the impact load can be absorbed not only by the rear side frames 2 and 3 but also by the exhaust silencer 30, the impact absorbing effect can be enhanced.

  When the shock absorption by the exhaust silencer 30 is completed, the load transmission member 52 is separated from the rear bumper reinforcement 6 by the reaction force received from the rear suspension cross member 20 and falls. Thereby, it is possible to avoid that the impact transmission by the rear side frames 2 and 3 subsequently performed is hindered by the load transmission member 52.

  Next, the configuration of the hanger members 60 and 62 that suspend and support the exhaust silencer 30 will be described with reference to FIGS. 7 and 8. 7 and 8, only the hanger members 60 and 62 for supporting the exhaust silencer 30 by the left rear side frame 3 are shown, but the exhaust silencer 30 for supporting the exhaust silencer 30 by the right rear side frame 2 is shown. The hanger members 60 and 62 have the same configuration. 7 and 8, the rear bumper 4 and the load transmission member 52 are not shown, but both the members 4 and 52 are provided in the above-described configuration.

  As shown in FIG. 7, the front hanger member 60 includes a frame-side fixing pin 64 whose one end is fixed to the rear side frame 3 and a silencer-side fixing whose one end is fixed to the front portion of the exhaust silencer 30 via a bracket 76. A pin 68 and a connection member 72 having a substantially elliptical shape in side view, which is connected to the other end of the frame side fixing pin 64 and the other end of the silencer side fixing pin 68 around an axis extending in the vehicle width direction. Have. The long axis direction of the connecting member 72 is inclined forward and downward with respect to the vertical direction, and the connecting member 72 is connected to the frame side fixing pin 64 at the upper end in the long axis direction, and the lower side in the long axis direction. The end of the side is connected to the silencer side fixing pin 68. That is, the connection part (silencer side connection part) 69 between the silencer side fixing pin 68 and the connection member 72 is lower and the front side than the connection part (frame side connection part) 65 between the frame side fixing pin 64 and the connection member 72. Is arranged. Thus, when an impact load is transmitted to the exhaust silencer 30 from the rear, the silencer side connecting portion 69 is rotated forward and upward with the frame side connecting portion 65 as the central axis.

  On the other hand, the rear hanger member 62 includes a frame-side fixing pin 66 having one end fixed to the rear side frame 3 via flanges 14 and 16, and a silencer having one end fixed to the rear portion of the exhaust silencer 30 via a bracket 78. The side fixing pin 70, the other end of the frame side fixing pin 66, and the other end of the silencer side fixing pin 70 are connected to each other so as to be rotatable about an axis extending in the vehicle width direction. And have. The long axis direction of the connecting member 74 is inclined rearward and downward with respect to the vertical direction, and the connecting member 72 is connected to the frame side fixing pin 66 at the upper end portion in the long axis direction, and the lower side in the long axis direction. The end of the side is connected to the silencer side fixing pin 70. That is, the connection part (silencer side connection part) 71 between the silencer side fixing pin 70 and the connection member 74 is lower and front than the connection part (frame side connection part) 67 between the frame side fixing pin 66 and the connection member 72. Is arranged. Thereby, when an impact load is transmitted to the exhaust silencer 30 from the rear, the silencer side connecting portion 71 is rotated forward and downward with the frame side connecting portion 67 as the central axis.

  Thus, when an impact load is applied to the exhaust silencer 30 from the rear, in the front hanger member 60, the silencer side connecting portion 69 rotates forward and upward with the frame side connecting portion 65 as the central axis, and the rear hanger member 62. Then, the silencer side connecting portion 71 rotates forward and downward with the frame side connecting portion 67 as the central axis. As a result, as shown in FIG. 8, the exhaust silencer 30 is pushed forward by the load transmission member 52 in a state where the front end portion is lifted higher than the rear end portion. Therefore, when the exhaust silencer 30 is pushed forward by the load transmission member 52, the height of the front end portion of the exhaust silencer 30 is maintained as much as possible, so that the front end portion can be reliably received by the rear suspension cross member 20, Shock absorption by the exhaust silencer 30 can be performed reliably.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIGS. Note that in the second embodiment, detailed description of the same configuration as in the first embodiment is omitted. 9 to 11, members having the same functions as those in the first embodiment are denoted by the same reference numerals.

  FIG. 9 is a left side view showing the rear part of the vehicle 101 to which the rear vehicle collision corresponding structure according to the second embodiment of the present invention is applied, and FIG. 10 is a bottom view of the vehicle 101.

  As shown in FIGS. 9 and 10, also in the present embodiment, as in the first embodiment, a rear suspension cross member 120 is installed between the left and right rear side frames 2 and 3. The rear suspension cross member 120 constitutes a part of a suspension device for a rear wheel, and is fixed to the lower surfaces of the left and right rear side frames 2 and 3 and obliquely inward in the vehicle width direction from the connecting portion. A pair of left and right front connection members 122, 123 extending rearward, and left and right rear side frames extending obliquely rearward from the rear end of each front connection member 122, 123 outward in the vehicle width direction. A pair of left and right rear connecting member portions 124 and 125 fixed to the lower surfaces of 2 and 3, respectively, a front lateral member portion 126 laid between the left and right front connecting member portions 122 and 123, and left and right rear connecting members. A rear side member portion 128 installed between the portions 124 and 125.

  In the present embodiment, tire pans 110 provided on the luggage compartment floor for accommodating spare tires are disposed behind the rear suspension cross member 20, and therefore, on both sides in the vehicle width direction across the tire pans 110. A hollow exhaust silencer 130 is provided for each.

  Each exhaust silencer 130 is a so-called vertical type silencer, and is disposed below the rear side frames 2 and 3 along the vehicle front-rear direction. Each exhaust silencer 130 is disposed between the rear connection member portions 124 and 125 of the rear suspension cross member 120 and the rear end portions of the rear side frames 2 and 3 in the vehicle longitudinal direction. Each exhaust silencer 130 is suspended and supported by the rear side frames 2 and 3 via hanger members (not shown). Moreover, as this hanger member, the hanger members 60 and 62 similar to 1st Embodiment may be used, and another hanger member may be used.

  An inlet pipe 132 for introducing exhaust gas is provided at the front portion of the exhaust silencer 130, and the inlet pipe 132 is connected to an exhaust pipe 150 extending rearward from the engine side. An exhaust pipe 134 for exhaust gas exhaust is provided at the rear part of the exhaust silencer 130 so that exhaust gas that has passed through the exhaust silencer 130 is exhausted to the rear of the vehicle via the exhaust pipe 134. It has become.

  As shown in FIG. 9, for example, a tie-down hook 160 having a substantially U shape in a side view is provided on the lower surface of the rear end portion of the rear side frames 2 and 3 so as to protrude downward. The tie-down hook 160 has a front end bent forward and a rear end bent rearward, and the front and rear bent portions are joined to the lower surfaces of the rear side frames 2 and 3 by welding, for example.

  As shown in FIGS. 9 and 10, a plate-like load transmission member 152 is joined to the front portion of the tie-down hook 160 by welding, for example. The load transmission member 152 is disposed along a plane perpendicular to the vehicle front-rear direction immediately after the exhaust silencer 130. In the present embodiment, the load transmission member 152 is disposed at a slight distance from the rear end surface of the exhaust silencer 130, but may be disposed in contact with the rear end surface of the exhaust silencer 130. Good.

  As shown in FIG. 11, in the present embodiment, when an impact load is applied to the rear bumper 4 from the rear of the vehicle, the impact is first absorbed by the crash cans 12, 13 and then in parallel with the impact absorption by the rear side frames 2, 3. Then, load transmission from the load transmission member 152 to the exhaust silencer 130 is performed. At this time, the load transmission member 152 moves forward as the rear side frames 2 and 3 are crushed so as to be compressed in the vehicle front-rear direction, thereby pushing the exhaust silencer 130 forward. When the exhaust silencer 130 is pushed forward until the exhaust silencer 130 contacts the rear connection member portions 124 and 125 of the rear suspension cross member 120, the exhaust silencer 130 is sandwiched between the rear suspension cross member 120 and the load transmission member 152 and crushed. . Thereby, since the impact load can be absorbed not only by the rear side frames 2 and 3 but also by the exhaust silencer 130, the impact absorbing effect can be enhanced. As described above, in the present embodiment, by providing the load transmission member 152 on the tie-down hook 160, it is possible to achieve shock absorption by the exhaust silencer 130 using the tie-down hook 160.

  In the second embodiment, when the shock absorption by the exhaust silencer 130 is finished by adjusting the joining force between the rear side frames 2 and 3 and the tie-down hook 160, the tie-down hook 160 is moved to the rear suspension cross member. The reaction force received from 120 may be separated from the rear side frames 2 and 3, and in this case, the subsequent shock absorption by the rear side frames 2 and 3 is inhibited by the tie-down hook 160 and the load transmission member 152. It can be avoided.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIGS. Note that in the third embodiment, detailed description of the same configurations as those of the first or second embodiment will be omitted. 12 to 15, members having the same functions as those in the first or second embodiment are denoted by the same reference numerals.

  As shown in FIGS. 12 and 13, also in this embodiment, a rear suspension cross member 120 similar to that of the second embodiment is installed between the left and right rear side frames 2 and 3. A tire pan 210 provided on the cargo floor to accommodate the spare tire is disposed behind the tire 20. In the present embodiment, a hollow exhaust silencer 230 is disposed only on the right side of the tire pan 210.

  The exhaust silencer 230 is provided below the right rear side frame 2 so as to be inclined with respect to the vehicle front-rear direction so that the front end portion is disposed on the inner side in the vehicle width direction than the rear end portion. The exhaust silencer 230 is disposed between the rear connection member portion 124 of the rear suspension cross member 120 and the rear end portion of the rear side frame 2 in the vehicle longitudinal direction. The exhaust silencer 230 is suspended and supported by the rear side frame 2 via a hanger member (not shown). Moreover, as this hanger member, the hanger members 60 and 62 similar to 1st Embodiment may be used, and another hanger member may be used.

  The front part of the exhaust silencer 230 is connected to an exhaust pipe 250 extending rearward from the engine side. Further, an outlet pipe 234 for discharging exhaust gas is provided at the rear part of the exhaust silencer 230 so that the exhaust gas that has passed through the exhaust silencer 230 is discharged to the rear of the vehicle via the outlet pipe 234. It has become.

  As shown in FIG. 12, a tie-down hook 160 similar to that of the second embodiment is provided on the lower surface of the rear end portion of the right rear side frame 2 so as to protrude downward. A plate-shaped load transmission member 252 is joined to the front portion of the tie-down hook 160 by, for example, welding.

  As shown in FIGS. 12 to 15, the load transmission member 252 is disposed behind the exhaust silencer 230 so as to be able to contact the rear end portion of the exhaust silencer 230 when an impact load is applied to the rear bumper 4 from the rear of the vehicle. The disposed abutting portion 254 and the exhaust silencer 230 in the vehicle width direction so as to restrict the exhaust silencer 230 from moving outward in the vehicle width direction when the corresponding contact portion 254 is in contact with the exhaust silencer 230. And a restricting portion 258 extending forward from the contact portion 254 in the outer portion.

  The contact portion 254 is disposed along a plane perpendicular to the vehicle front-rear direction immediately after the exhaust silencer 230. Further, an outer extending portion 256 extending outward in the vehicle width direction is provided at the upper end portion of the contact portion 254.

  The restricting portion 258 is disposed along a surface perpendicular to the vehicle width direction outside the exhaust silencer 230 in the vehicle width direction. The restricting portion 258 is supported by the rear side frame 2 via, for example, a rod-like support member 270. The support member 270 includes a lower fixing portion 272 fixed to the outer surface of the restricting portion 258 by, for example, welding, a horizontal portion 274 extending inward in the vehicle width direction from the upper end of the lower fixing portion 272, and the horizontal portion. 274 and an upper fixing portion 276 extending upward from the inner end in the vehicle width direction. The upper fixing portion 276 is fixed to the outer surface of the rear side frame 2 by, for example, welding. Further, a rear extension 260 that extends rearward is provided at the upper end of the restricting portion 258.

  The outer extending portion 256 and the rear extending portion 260 are connected via a connecting portion 262. The outer extending portion 256, the rear extending portion 260, and the connecting portion 262 are disposed above the outlet pipe 234 so as to avoid interference with the outlet pipe 234 of the exhaust silencer 230.

  In the present embodiment, when an impact load is applied to the rear bumper 4 from the rear of the vehicle, the shock absorption by the crash cans 12 and 13 is first performed, and the shock absorption by the rear side frames 2 and 3 is performed in parallel with the second embodiment. Thus, load transmission from the contact portion 254 of the load transmission member 252 to the exhaust silencer 230 is performed. At this time, the contact portion 254 of the load transmission member 252 moves forward as the rear side frames 2 and 3 are crushed so as to be compressed in the vehicle front-rear direction, thereby pushing the exhaust silencer 230 forward. At this time, the restricting portion 258 of the load transmitting member 252 guides the exhaust silencer 230 forward or obliquely forward inward in the vehicle width direction in order to restrict the exhaust silencer 230 from moving outward in the vehicle width direction. be able to. On the other hand, the front end portion of the exhaust silencer 230 is restricted from moving inward in the vehicle width direction by the tire pan 210, so that the exhaust silencer 230 can be prevented from rotating around the vertical axis. .

  The exhaust silencer 230 thus pushed forward or obliquely forward by the load transmitting member 252 has a front end portion of the silencer having at least one of the rear connection member portion 124 or the rear side member portion 128 of the rear suspension cross member 120. And is sandwiched between the rear suspension cross member 120 and the load transmission member 252 and crushed. Thereby, since the impact load can be absorbed not only by the rear side frames 2 and 3 but also by the exhaust silencer 230, the impact absorbing effect can be enhanced. As described above, in this embodiment as well, as in the second embodiment, by providing the load transmission member 252 to the tie-down hook 160, the tie-down hook 160 is used to achieve shock absorption by the exhaust silencer 230. be able to.

  While the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

  For example, in the above-described embodiment, when an impact load is applied to the rear bumper 4 from the rear of the vehicle, the crash cans 12 and 13 are first crushed, and then the exhaust silencer 30 starts to be pushed forward by the load transmission member 52. Although the case where the rear side frames 2 and 3 start to be crushed and then the exhaust silencer 30 starts to be crushed has been described, in the present invention, this order is not necessarily limited thereto. Specifically, for example, after the rear side frames 2 and 3 start to be crushed, load transmission (pushing forward) to the exhaust silencer 30 by the load transmission member 52 is started, or the exhaust silencer 30 starts to be crushed. The rear side frames 2 and 3 may be started to be crushed later.

  In the above-described embodiment, the configuration in which the rear suspension cross members 20 and 120 are used as receiving members that receive the exhaust silencers 30, 130, and 230 pushed forward by the load transmitting members 52, 152, and 252 has been described. The receiving member in the invention may be a member other than the rear suspension cross member as long as it is a vehicle body structural member disposed in front of the exhaust silencer.

  Furthermore, the configuration of the exhaust silencer used to absorb the impact load in the present invention is not limited to the exhaust silencer 30, 130, 230 described in the first to third embodiments, and various exhaust silencers are used. be able to.

  Furthermore, in the above-described embodiment, the configuration using the above-described load transmission members 52, 152, and 252 has been described. There is no particular limitation as long as it can be transmitted to the network.

  As described above, according to the present invention, it is possible to improve the safety of passengers in the vehicle interior by effectively absorbing the impact load applied from the rear of the vehicle by the exhaust silencer. It may be suitably used in the vehicle manufacturing industry.

1, 101, 201: Vehicle, 2, 3: Rear side frame, 4: Rear bumper, 6: Rear bumper reinforcement, 12, 13: Crash can, 20, 120: Rear suspension cross member, 30, 130, 230: Exhaust silencer , 52, 152, 252: load transmitting member, 54: contact portion, 56: support portion, 60, 62: hanger member, 64, 66: frame side fixing pin, 68, 70: silencer side fixing pin, 72, 74 : Connection member, 65, 67: frame side connection part, 69, 71: silencer side connection part, 254: contact part, 258: restriction part, 160: tie-down hook.

Claims (9)

A pair of left and right rear side frames extending in the vehicle longitudinal direction at the rear of the vehicle;
A rear bumper extending in the vehicle width direction behind the rear side frame;
A collision-reducing structure for a rear portion of a vehicle having a hollow exhaust silencer provided in an exhaust path of an engine and disposed at a position overlapping the rear side frame and the vehicle longitudinal direction,
A load transmission member disposed behind the exhaust silencer and transmitting an impact load applied to the rear bumper from the rear of the vehicle to the exhaust silencer;
A rear-vehicle collision response structure, comprising: a vehicle body structural member disposed in front of the exhaust silencer, wherein the receiving member receives the exhaust silencer pushed forward by the load transmission member.   2. The rear vehicle collision-resistant structure according to claim 1, wherein the receiving member is a rear suspension cross member that is installed between the left and right rear side frames in front of the exhaust silencer. The exhaust silencer is provided at a position lower than a rear bumper reinforcement provided inside the rear bumper,
The load transmission member extends downward from the rear bumper reinforcement so that it can contact the rear end of the exhaust silencer when an impact load is applied to the rear bumper from the rear of the vehicle. And a support portion extending forward from the contact portion so that the bottom portion of the exhaust silencer can be supported in a state where the corresponding contact portion is in contact with the rear end portion of the exhaust silencer. 3. A collision-resolving structure for a rear portion of a vehicle according to claim 1 or 2, characterized in that: Crash cans that absorb the impact load while being crushed when an impact load is applied to the rear bumper from the rear of the vehicle are provided across the rear end of each rear side frame and the rear bumper reinforcement, respectively.
The load transmitting member is disposed between the abutting portion and a rear end portion of the exhaust silencer after the crash can is crushed when an impact load is applied to the rear bumper from the rear of the vehicle. 4. The collision response structure at the rear part of the vehicle according to claim 3, wherein the structure is arranged with a space necessary for contacting the silencer.   The load transmitting member is disposed so that a front end portion of the support portion overlaps with the exhaust silencer in a vehicle front-rear direction when no impact load is applied to the rear bumper. Item 5. A vehicle rear collision response structure according to Item 4.   The load transmitting member is joined to the rear bumper reinforcement so that when the exhaust silencer is crushed between the load transmitting member and the receiving member, the load transmitting member is separated from the rear bumper reinforcement by a reaction force from the receiving member. 6. The collision-resolving structure at the rear of the vehicle according to any one of claims 3 to 5, wherein The exhaust silencer is suspended and supported by each rear side frame via a pair of front and rear hanger members,
The hanger member extends in the vehicle width direction to a frame side fixing member fixed to the rear side frame, a silencer side fixing member fixed to the exhaust silencer, and the frame side fixing member and the silencer side fixing member, respectively. A connecting member connected rotatably about an axis;
In the hanger member on the front side, the silencer side fixing member is fixed to a front portion of the exhaust silencer, and a connecting portion between the silencer side fixing member and the connecting member is formed by the frame side fixing member and the connecting member. Arranged below and in front of the connecting portion of
In the hanger member on the rear side, the silencer side fixing member is fixed to a rear portion of the exhaust silencer, and a connecting portion between the silencer side fixing member and the connecting member includes the frame side fixing member and the connecting member. The vehicle rear portion collision response structure according to any one of claims 1 to 6, wherein the vehicle rear portion collision arrangement structure is disposed below and behind the connecting portion. A tie-down hook is provided on the lower surface of the rear side frame so as to protrude downward.
The vehicle rear portion collision response structure according to claim 1, wherein the tie-down hook is provided with the load transmission member.   The load transmitting member includes a contact portion disposed at the rear of the exhaust silencer so as to be able to contact the rear end portion of the exhaust silencer when an impact load is applied to the rear bumper from the rear of the vehicle. The exhaust silencer extends forward from the contact portion in the vehicle width direction outer side than the exhaust silencer so as to restrict the exhaust silencer from moving outward in the vehicle width direction when the portion is in contact with the exhaust silencer. The vehicle rear portion collision response structure according to claim 8, further comprising a restriction portion.

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