JP5874213B2 - Lower body structure of the vehicle - Google Patents

Description

The present invention includes a lower body of a vehicle including an exhaust pipe extending in the longitudinal direction of the vehicle along the tunnel portion of the floor panel, and a harness that is-installing in the longitudinal direction along the lower surface of the floor panel Concerning structure.

Conventionally, as shown in Patent Document 1 below, even when a vehicle is damaged by an external force, avoiding the influence on the high voltage cable (harness) as much as possible, and mounting equipment for protecting the high voltage cable For the purpose of keeping it small and making the front compartment of the vehicle as compact as possible, it has a mounting unit in the front compartment in front of the dash panel, a battery in the rear of the dash panel, and a high voltage cable connected to the battery. in-installing structure for a high voltage cable of a vehicle which is provided along the panel, provided side by side a plurality of detail units constituting the mounting unit in a vehicle width direction in front of the dash panel, the surface of the vehicle behind the other after their details unit A high-voltage cable is formed so as to create a step in the direction and at a different distance from the dash panel. While-installing to pass dash panel portion facing the rear surface of the distance is greater side details unit from the panel to extend rearward of the vehicle body is introduced into the tunnel portion of the floor panel from the dash panel portion Has been done.

  In addition, as shown in Patent Document 2 below, for the purpose of providing a wire harness capable of improving workability, stability, durability, safety, etc., the interior of the vehicle of a hybrid vehicle or an electric vehicle is provided. A plurality of high-voltage wires that extend from the front side to the rear side inside the vehicle through the underside of the vehicle body frame and connect between the battery and the inverter, or between the motor and the inverter, and protection that protects the plurality of high-voltage wires In the wire harness comprising a member, the protection member is constituted by a plurality of separate parts including a vehicle interior protection member and a vehicle body underfloor protection member, and the vehicle body underfloor protection member has a non-circular cross section. A flat tube made of a synthetic resin having the insulating properties, and the flat tube is connected to an independent crest and trough in the circumferential direction of the member along the axial direction of the member. Formed in a bellows-like shape having a top surface that can be an underfloor installation surface in the mountain portion, and formed into a shape that can be bent in a predetermined direction before being routed under the vehicle body floor, and Formed in a seamless shape without slits along the axis of the member, and formed into a shape having an internal space that matches the state in which the high-voltage electric wires are arranged in a horizontal row, and protrudes from the vehicle body floor toward the ground It is formed in the shape which can be installed beside the lean hose provided in the said vehicle body frame, and is formed in the shape lower than the said lean hose.

  Furthermore, as shown in Patent Document 3 below, in order to prevent the metal pipe from rusting due to dew condensation that occurs in the metal pipe through which the power cable is inserted, the interior of the vehicle is arranged in the longitudinal direction of the vehicle. In a vehicle wiring structure in which a power supply and an electrical load arranged at intervals are connected by a power cable, between a lower position of the power supply installation location and a lower position of the electrical load installation location on the lower surface of the vehicle floor A metal pipe having both ends inserted into the vehicle, and a power cable inserted into the metal pipe and connected to the power source and an electrical load. From the exhaust pipe that is disposed in the tunnel portion formed in the panel and is inclined from both ends toward the bottom in the vertical direction, and heats the bottom It is known in which a structure having a heating means that.

JP 2011-063147 A JP 2010-012868 A JP 2010-143408 A

In-installing structure for a high voltage cable according to Patent Document 1, the rear portion of the high-voltage cables that are routed along the dash panel is introduced into the tunnel portion, the rear side of the vehicle along the upper bottom surface of the tunnel portion Therefore, it is possible to effectively protect the high voltage cable by preventing the obstacle on the road surface from contacting the high voltage cable when the vehicle is traveling. However, since an exhaust pipe that is in a high temperature state when the vehicle is running is disposed in the tunnel portion, there is a possibility that the high voltage cable may be damaged due to the influence of the exhaust pipe, and this is prevented. It is necessary to take measures to do this.

Note that Patent Document 1, by-installing apart from each other on the opposite side in the vehicle width direction and the high voltage cable and the exhaust pipe in the tunnel section, a high-voltage cable and the exhaust gas in a narrow limited space Although a configuration that avoids thermal expansion and interference of the pipe is disclosed, even in such a configuration, a large-diameter portion made of a catalyst or the like provided in the exhaust pipe is close to the high-voltage cable. It is inevitable to prevent the state from entering the state, and the thermal effect of the catalyst may reach the high-voltage cable.

  Further, by forming a protective cover, which is installed at the rear portion of the dash panel so as to cover the high voltage cable from below, with a heat insulating material, the radiant heat of the exhaust pipe is directly applied to the high voltage cable. It is also conceivable to prevent it from acting on. However, when configured in this way, air heated by the influence of the exhaust pipe when traveling on a congested road or the like is likely to stay in the protective cover, and the high voltage cable is overheated. May be more likely to occur.

  On the other hand, as disclosed in the above cited document 2, the protective member for protecting a plurality of high-voltage electric wires is a flat tube made of synthetic resin having a non-circular cross-sectional insulation, and the flat tube is formed under the vehicle floor. If the flat tube is formed in a shape that can be installed beside the lean hose provided in the vehicle body frame so as to protrude in the direction of the ground, and is formed in a shape that is lower than the lean hose, There is an advantage in that it can be prevented from contacting the road surface and can be effectively protected.

However, when extending the high-voltage wire, which is-installing along the body under floor part as described above in the engine room, the high pressure to avoid the sub-frame for suspension support disposed below a front portion of the vehicle body must-installing the wires, in order that it is desirable to extend the high-voltage cable to the front side of the dash panel via a tunnel portion formed on the floor panel of the vehicle body, it is-installing to the tunnel portion It is necessary to take measures to prevent the heat influence of the exhaust pipe on the high-voltage electric wire.

  Further, as disclosed in Patent Document 3, the power cable is covered with a metal pipe, and the power cable and the exhaust pipe are disposed adjacent to each other in a tunnel portion formed in the floor panel. However, if the metal pipe is heated by heat radiation from the exhaust pipe, it is possible to effectively prevent condensation in the metal pipe. There is a possibility that the disposed power cable may be damaged by the heat effect of the exhaust pipe, and in order to prevent this, there is a problem that an expensive power cable having heat resistance must be used.

The present invention has been made in view of the above problems, by properly-installing the harness along the lower surface of the floor panel, the harness receive a thermal influence of the exhaust pipe with a simple structure It aims at providing the lower body structure of the vehicle which can be prevented effectively.

According to a first aspect of the present invention, there is provided a dash panel that partitions an engine room of a vehicle and a vehicle compartment behind the vehicle, a floor panel installed so as to extend from a lower end portion of the dash panel to the rear side of the vehicle, and the floor panel A tunnel portion bulging upward in the center in the vehicle width direction, an exhaust pipe extending in the front-rear direction of the vehicle along the tunnel portion, and a lower surface of the floor panel. a lower body structure for a vehicle and a harness that is-installing in the longitudinal direction of the vehicle, together with the inside the tunnel portion is provided a heat insulator covering the installation portion of the exhaust pipe from above, the said heat insulator, the A recessed portion in which a part of the side surface is recessed inward in the vehicle width direction is formed, and is in a space formed between the recessed portion of the heat insulator and the tunnel portion. The harness is disposed at a position spaced below the upper lower surface of the tunnel portion, and the harness includes a harness rear portion disposed below the exhaust pipe, and a heat insulator from the front end portion of the harness rear portion. A vertically extending portion that extends upward through a space portion formed between the recessed portion and the tunnel portion of the exhaust pipe and extends above a maximum width portion in a portion adjacent to the exhaust pipe in the vehicle width direction. And a harness front portion that extends from the upper end of the vertically extending portion through the tunnel portion into the engine room.

The invention according to claim 2, in the lower vehicle body structure of the vehicle according to the claim 1, said harness, in which the distribution cord at a position spaced below the top of the heat insulator.

According to a third aspect of the present invention, in the lower body structure of the vehicle according to the first or second aspect , a catalyst having a larger diameter and a higher temperature than the tubular portion of the exhaust pipe is disposed in a front portion of the exhaust pipe. The harness vertically extending portion is disposed at a position shifted forward or backward from the maximum width portion of the catalyst.

According to a fourth aspect of the present invention, in the lower body structure of the vehicle according to the third aspect of the invention, a large-diameter functional portion of the exhaust pipe is provided in a rear side portion of the catalyst of the exhaust pipe and the vertically extending portion of the harness. It is what was done.

The invention according to claim 5 is the vehicle lower body structure according to any one of claims 1 to 4 , wherein the tunnel cross member extends in the vehicle width direction along the inner wall surface of the tunnel portion. A vertically extending portion of the harness is disposed on the front side of the tunnel cross member.

According to a sixth aspect of the present invention, in the lower body structure of the vehicle according to any one of the first to fifth aspects of the present invention, the lower surface projects from the lower end of the tunnel portion to the lower surface of the floor panel. along a frame member which extends in the longitudinal direction of the vehicle, in which the harness rear above the lower surface of the frame member is-installing.

According to a seventh aspect of the present invention, in the lower body structure of the vehicle according to the sixth aspect, a stepped portion is formed in which the lower surface of the front portion of the frame member is recessed above the lower surface of the rear portion. The rear portion of the subframe is attached to the front portion of the raised portion, and the harness front portion extends in the vehicle width direction from the front end portion of the harness rear portion to the tunnel portion side along the rear edge portion of the subframe. those which are-installing.

The invention according to claim 8, in the lower vehicle body structure of the vehicle according to the claim 7, together with the harness rear is-installing in the vehicle width direction outer side than the installation portion of the frame member, the harness rear from the front in which stepped raised portions harness in the vehicle width direction inner side through the lower of the frame member is-installing.

According to a ninth aspect of the present invention, in the lower body structure of the vehicle according to the seventh or eighth aspect of the present invention, a drop-off promoting portion that promotes the rear portion of the subframe to drop downward during a frontal collision of the vehicle is provided. Is.

In the invention according to claim 1, since that is configured to-installing the harness passes between the wall surface of the concave portion and the tunnel portion of the heat insulator, that said harness comes into contact with the obstacle on the road surface during traveling of the vehicle It is possible to effectively prevent thermal damage from occurring in the harness by blocking the heat effect of the exhaust pipe disposed in the tunnel portion by the heat insulator while preventing damage caused by the above. Further, since the harness is disposed at a position spaced below the upper lower surface of the tunnel portion, air heated to a high temperature due to the heat effect of the exhaust pipe when traveling on a congested road or the like is separated from the upper lower surface of the tunnel portion. Even when it stays between the heat insulator and the upper portion of the heat insulator, it is possible to effectively suppress the harness from being affected by the high-temperature air. Further, the harness passes through a rear portion of the harness disposed below the exhaust pipe in the tunnel portion, and a space formed between the recessed portion of the heat insulator and the tunnel portion from the front end portion of the rear portion of the harness. An upper and lower extending portion extending upward from the maximum width portion of the exhaust pipe adjacent to the vehicle width direction, and an engine extending from the upper end of the upper and lower extending portion through the tunnel portion. Since the front part of the harness extends in the room, the front part of the harness passes through the lower part of the dash panel while preventing the harness from being close to the maximum width part of the exhaust pipe. part of such a case configured to derive in the engine room, that-installing been harness below the dash panel during traveling of the vehicle is damaged in contact with an obstacle on the road surface Without causing condition, it has the advantage of properly-installing the harness.

  In the invention which concerns on Claim 2, since the said harness was arranged in the position spaced apart downward from the top part of the said heat insulator, from the upper lower surface of the heat insulator which tends to accumulate the hot air discharged | emitted from the exhaust pipe in a tunnel part. There is an advantage that the harnesses can be separated and thereby the harness can be more effectively suppressed from being damaged by heat.

In the invention according to claim 3 , a catalyst having a larger diameter and a higher temperature than the tubular portion of the exhaust pipe is disposed at the front portion of the exhaust pipe, and is shifted forward or rearward from the maximum width portion of the catalyst. Since the vertically extending portion of the harness is disposed at the position, the vertically extending portion of the harness can be compactly disposed in a limited space portion of the tunnel portion, and the influence of high heat generated in the catalyst is affected. There exists an advantage that it can control effectively that it extends to the up-and-down extending part of the said harness.

In the invention according to claim 4 , a silencer, an SCR (urea selective reduction catalyst system), a DPF (diesel particulate collection filter), a heat exchange are provided on the rear side of the exhaust pipe catalyst and the vertically extending portion of the harness. Since the large-diameter functional portion of the exhaust pipe composed of a vessel or a pipe assembly portion is provided, the above-mentioned various types of components are effectively prevented while the high-temperature effect generated in the large-diameter functional portion is prevented from reaching the vertically extending portion of the harness. There is an advantage that the large-diameter functional portion can be arranged compactly and appropriately.

According to a fifth aspect of the present invention, in the vehicle lower body structure in which the tunnel cross member extends in the vehicle width direction along the inner wall surface of the tunnel portion, the harness extends vertically on the front side of the tunnel cross member. Since the tunnel portion is reinforced by the tunnel cross member and the rigidity thereof is sufficiently secured, the vertically extending portion of the harness is compactly arranged in the tunnel portion, There are advantages such as effective protection.

In the invention according to claim 6, in the vehicle lower body structure having a frame member extending in the front-rear direction of the vehicle along the lower surface of the floor panel with the lower surface protruding downward from the lower end of the tunnel portion, because-installing the harness rear above the lower surface of the frame member, so as not to the harness rear damage in contact with the obstacle on the road surface during running of the vehicle, effectively harness rear by the frame members Can be protected.

In the invention according to claim 7, a stepped portion is formed in which the lower surface of the front portion of the frame member is recessed above the lower surface of the rear portion, and the rear portion of the subframe is formed at the front portion of the raised portion. attached together, because you-installing the harness front so as to extend in the vehicle width direction to the tunnel portion side from the front end of the rear the harness along the rear edge of the sub-frame, large projects downward said sub-frame from the floor panel The advantage that it is possible to prevent the obstacle from coming into contact with the front part of the harness and prevent the front part of the harness from being effectively protected by the subframe. There is.

In the invention according to claim 8, as well as-installing the harness rear in the vehicle width direction outer side than the installation portion of the frame member, the car from the front end of the harness rear through the lower stepped up portion of the frame member since the harness and-installing in the width direction inner side, the disposed exhaust tube is spaced the harness rear together with the harness rear can be prevented to effectively receive the heat damage of the exhaust pipe in the tunnel section, the draws harness in the tunnel portion without projecting below the floor panel, there is an advantage that the harness can be appropriately-installing.

In the invention according to claim 9 , it is possible to prevent the rear portion of the subframe from retreating and contacting the harness to the subframe by dropping the rear portion of the subframe downward during a frontal collision of the vehicle. Therefore, there is an advantage that damage to the harness can be effectively prevented.

It is side surface sectional drawing which shows embodiment of the lower vehicle body structure of the vehicle which concerns on this invention. It is a bottom view which shows the whole structure of the said lower vehicle body structure. It is the III-III sectional view taken on the line of FIG. It is a bottom view which shows the principal part structure of the said lower vehicle body structure. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. It is a front view which shows the specific structure of an insulator. It is a top view which shows the specific structure of an insulator. It is a side view which shows the specific structure of an insulator. It is a top view which shows the deformation | transformation state of the sub-frame support part at the time of front collision of a vehicle. It is side surface sectional drawing which shows the deformation | transformation state of the sub-frame at the time of the front collision of a vehicle. It is side surface sectional drawing which shows the deformation | transformation state of the vehicle body in the front collision initial stage of a vehicle. It is side surface sectional drawing which shows the deformation | transformation state of the vehicle body in the front collision middle stage of a vehicle.

  1 and 2 show an embodiment of a lower body structure of a vehicle according to the present invention. The vehicle includes a dash panel 3 that partitions the engine room 1 and a vehicle compartment 2 behind the floor, a floor panel 4 that extends from the lower end of the dash panel 3 to the rear side of the vehicle, and the engine room 1. And a pair of left and right front side frames 5 installed so as to extend in the front-rear direction of the vehicle.

  A crash can 6 is attached to the front end portion of the front side frame 5 to absorb collision energy by being crushed at the time of a frontal collision of the vehicle, and a bumper beam extending in the vehicle width direction so as to connect the left and right crash cans 6. 7 is provided. Between the left and right front side frames 5, an engine 8 constituting a drive mechanism of a hybrid vehicle and a transaxle device 9 including a motor generator and a power distribution mechanism are disposed.

  An exhaust pipe 11 is connected to the rear wall surface of the engine 8 via an exhaust manifold 10. The exhaust pipe 11 is introduced into a tunnel portion 12 in which a center portion in the vehicle width direction of the floor panel 4 is bulged upward, and the lower portion of the floor panel 4 extends in the vehicle front-rear direction along the tunnel portion 12. It is installed. The exhaust pipe 11 is provided with an upstream first catalyst 13 and a downstream second catalyst 14 which are larger in diameter and higher in temperature than the tubular portion of the exhaust pipe 11, and on the rear side thereof. A large-diameter functional portion (not shown) of the exhaust pipe 11 made of a silencer or the like is provided, and a heat insulator 15 is provided so as to cover the arrangement portion of the first catalyst 13 and the second catalyst 14 from above. .

  As shown in FIGS. 3 and 4, the left and right side portions of the floor panel 4 are joined to the inner wall surface of the side sill 16 installed so as to extend in the front-rear direction of the vehicle at the side portion of the passenger compartment 2. . A floor frame 17 extends in the front-rear direction of the vehicle body along the lower surface of the floor panel 4 at a portion that is inward of the side sill 16 in the vehicle width direction and continues to the rear end of the front side frame 5. It is installed. Further, on the inner side of the floor frame 17, a tunnel lower frame 18 that reinforces the lower end portion of the tunnel portion 12 extends in the longitudinal direction of the vehicle.

  The floor frame 17 and the tunnel lower frame 18 each have a joint flange portion joined to the lower surface of the floor panel 4 and a U-shaped cross section installed so that the lower surface protrudes below the lower end of the tunnel portion 12. And a main body portion. Then, the left and right floor frames 17 are inclined so that the installation interval with the tunnel lower frame 18 increases toward the rear portion, that is, as shown in FIGS. It is arranged in a shape.

  A torque box 19 that reinforces the front portion of the floor panel 4 by connecting the front end portion of the side sill 16 and the front end portion of the floor frame 17 is attached to the lower surfaces of the left and right side portions of the floor panel 4. Further, as shown in FIG. 4, the front end of the tunnel lower frame 18 extends outwardly of the vehicle body while curving in an arc shape when viewed from the bottom of the vehicle body, and as shown in FIGS. Is provided with a stepped-up portion 20 that is recessed so that the lower surface thereof is located above the main body portion (rear portion) of the tunnel lower frame 18, and the outer end in the vehicle width direction of the stepped-up portion 20 is provided. It is connected to the side wall surface of the floor frame 17.

  A rear portion 22 of a subframe 21 that supports a suspension member (not shown) for a front wheel is attached to a front portion of a stepped portion 20 provided at the front end of the tunnel lower frame 18. As shown in FIG. 5, an insertion hole 24 for the mounting bolt 23 is formed in the rear portion 22 of the subframe 21, and a spacer 25 for reinforcing the installation portion of the insertion hole 24 is disposed. Further, as shown in FIG. 6, a reference pin 26 protrudes upward in the vicinity of the installation portion of the insertion hole 24 and the spacer 25 and on the inner side in the vehicle width direction.

  In the raised portion 20 of the tunnel lower frame 18, a weld nut 28 to which a mounting bolt 27 installed so as to pass through an insertion hole 24 and a spacer 25 formed in the rear portion 22 of the subframe 21 is screwed. Is fixed, and a reinforcement 29 is provided to reinforce the raised portion 20, and the reference pin 26 is provided in the vicinity of the installation portion of the weld nut 28 and on the inner side in the vehicle width direction. A reference hole 30 to be inserted is formed.

  Further, in the vicinity of the insertion hole 24 and the spacer 25 formed in the sub-frame 21, a bead portion 31 recessed downward is installed so as to extend in the vehicle width direction. Due to the bead portion 31 and the reference pin 26 provided in the subframe 21 and the reference hole 30 provided in the raised portion 20 of the tunnel lower frame 18, the subframe is used during a frontal collision of the vehicle as will be described later. A drop-off promoting portion that promotes the rear portion 22 of 21 to drop downward is configured.

As shown in FIG. 1, a high-voltage battery 32 that supplies drive current to the motor generator of the transaxle device 9 and stores power generation energy supplied from the motor generator is installed at the rear portion of the vehicle body. . A harness 33 in which a plurality of high-voltage wires connecting the high-voltage battery 32 and the motor generator of the transaxle device 9 are bundled is arranged so as to extend in the vehicle front-rear direction along the lower surface of the floor panel 4. It has been searched .

  The harness 33 extends from the lead-out portion led out from the installation portion of the high-voltage battery 32 to the lower side of the floor panel 4 and extends between the floor frame 17 and the tunnel lower frame 18 to the front side of the vehicle. 34, a vehicle width direction extending portion 35 extending inward in the vehicle width direction from the front end portion to the tunnel portion 12 side along the rear edge portion of the subframe 21, and the heat insulator 15 from the inner end portion thereof. It has a vertically extending portion 36 that extends upward through the wall surface of the tunnel portion 12 and a harness front portion 37 that is introduced from the upper end portion of the tunnel portion 12 through the tunnel portion 12 into the engine room 1. The part is connected to the transaxle device 9.

The harness rear portion 34 has both front and rear end portions covered from below by a front support member 38 and a rear support member 39 and a pair of front and rear intermediate support members 40 and 41 disposed therebetween. by being supported on the lower surface, as shown in FIG. 3, the vehicle body front view, and is-installing so as to be positioned above the lower surface of the frame member made of the floor frame 17 and the tunnel lower frame 18.

Further, as shown in FIGS. 4 to 6, the front support member 38 has an extension portion 42 that supports the extension portion 35 of the harness 33 in the vehicle width direction so as to cover the vehicle width direction from below. It is installed. The vehicle width direction extending portion 35 of the harness 33 is between the rear portion 22 of the subframe 21 attached to the raised portion 20 of the tunnel lower frame 18 and the rear side wall surface of the raised portion 20. It passes below the stepped raised portion 20, and the vehicle width direction inner side portion of the heat insulator 15, are-installing to reach between the outside in the vehicle width direction sides of the tunnel portion 12.

  The heat insulator 15 is formed of an aluminum alloy material or the like, and as shown in FIGS. 7 to 10, an insulator body 43 having a U-shaped cross section and a lower end portion projecting outward from the vehicle width direction. The front portion of the insulator main body 43 is inclined in a forwardly rising shape so as to correspond to the upper portion of the tunnel portion 12 and the lower portion of the dash panel 3. The heat insulator 15 is disposed at a predetermined interval below the tunnel portion 12 by fixing the mounting flange 44 of the heat insulator 15 to the lower surface of the tunnel lower frame 18 or the like. The heat insulator 15 covers the installation portion of the exhaust pipe 11 from above, so that the heat of the exhaust pipe 11 is prevented from entering the vehicle compartment 2.

  A part of the front side surface of the heat insulator 15, that is, the side wall surface located in the vicinity of the vertically extending portion 36 of the harness 33, is partially inward in the vehicle width direction, that is, the center of the tunnel portion 12. A recessed portion 45 that is recessed on the portion side is formed. A vertically extending portion 36 of the harness 33 is introduced into a space formed between the recessed portion 45 of the heat insulator 15 and the tunnel portion 12, and is provided in a front portion of the exhaust pipe 11. The first catalyst 13 is installed so as to extend rearward of the maximum width portion of the first catalyst 13 and upward at a position shifted forward of the maximum width portion of the second catalyst 14.

  In addition, on the rear side of the recessed portion 45 formed in the heat insulator 15, there is a lower side to avoid interference with the tunnel cross member 46 extending in the vehicle width direction along the inner wall surface of the tunnel portion 12. A recessed portion 47 that is recessed is formed. In addition, a vertically extending portion 36 of the harness 33 is disposed in front of the tunnel cross member 46 and a recess 47 of the heat insulator 15 formed at a position corresponding to the tunnel cross member 46.

At a position corresponding to the recessed portion 45 provided in the heat insulator 15, the tunnel portion 12 is covered with the vertically extending portion 36 of the harness 33 and the extending portion 48 extending forward from the upper end portion thereof. A support member 49 made of synthetic resin is provided on the side wall surface (see FIG. 7). The extension 48 of the harness front portion 37 is a position spaced below the upper lower surface of the tunnel portion 12 and is located at the top of the heat insulator 15, that is, the top of the heat insulator 15. in a position spaced below the 19a, it is-installing so as to extend in the longitudinal direction of the vehicle.

  Further, as shown in FIGS. 4 and 8, the harness front portion 37 includes an upper portion 51 extending in the vehicle width direction between the tunnel portion 12 and the tunnel-shaped recess 50 formed in the dash panel 3, and The connecting portion 52 extends from the front end portion into the engine room 1 and is connected to the transaxle device 9. And the upper part 51 of the said harness front part 37 is supported by the tunnel-shaped recessed part 50 of the said dash panel 3 in the state coat | covered with the supporting member 53 made from a synthetic resin.

As described above, the dash panel 3 that partitions the engine room 1 of the vehicle and the passenger compartment 2 behind the vehicle, the floor panel 4 installed so as to extend from the lower end of the dash panel 3 to the rear side of the vehicle, and the floor A tunnel portion 12 having a center portion in the vehicle width direction of the panel 4 bulged upward, an exhaust pipe 11 extending in the vehicle front-rear direction along a lower portion of the floor panel 4 along the tunnel portion 12, and the floor in the lower vehicle body structure of a vehicle and a harness 33 that is-installing in the longitudinal direction along the lower surface of the panel 4, provided with a heat insulator 15 covering the installation portion of the exhaust pipe 11 from above the tunnel portion 12 A recess 45 is formed in the side surface of the heat insulator 15 so that a part thereof is recessed inward in the vehicle width direction. The recess 45 of the heat insulator 15 and the above-described ton are formed. Since the harness 33 is disposed in a space formed between the tunnel portion 12 and at a position spaced below the upper lower surface of the tunnel portion 12, the harness 33 is disposed along the lower surface of the floor panel 4. properly by-installing, the harness 33 is advantageous in that the receive thermal influence of the exhaust pipe 11 can be effectively prevented with a simple configuration.

  That is, in the above-described embodiment, a harness rear portion 34 that is disposed below the exhaust pipe 11 and extends in the front-rear direction of the vehicle along the lower surface of the floor panel 4, and a vehicle provided at the front end portion of the harness rear portion 34. A vertically extending portion 36 extending upward from an inner end portion of the width direction extending portion 35 through the space between the recessed portion 45 of the heat insulator 15 and the wall surface of the tunnel portion 12, and an upper end of the vertically extending portion 36 A harness front portion 37 extending through the tunnel portion 12 and extending into the engine room 1 is provided in the harness 33, and as shown in FIGS. 4 and 7, Since the extension portion 48 provided at the rear portion of the harness front portion 37 is disposed in a space portion formed between the recessed portion 45 of the heat insulator 15 and the tunnel portion 12, the vehicle The heat effect of the exhaust pipe 11 is reduced while preventing damage caused by the vertically extending portion 36 of the harness 33 and the extended portion 48 of the harness front portion 37 coming into contact with road obstacles during traveling. There is an advantage that it is possible to effectively prevent heat damage of the harness 33 by being blocked by 15.

  In addition, the vertically extending portion 36 of the harness 33 and the extended portion 48 of the harness front portion 37 are in a space formed between the recessed portion 45 of the heat insulator 15 and the tunnel portion 12, and the tunnel portion Since the air is heated at a high temperature under the influence of the exhaust pipe 11 when traveling on a congested road or the like, the air heated by the upper lower surface of the tunnel portion 12 and the heat insulator 15 Even when it stays between the upper part of the wire and the harness 33, it is possible to effectively suppress the harness 33 from being damaged by the high-temperature air.

In the above embodiment, since the extension portion 48 or the like of the upper and lower extending portion 36 and the harness front 37 of the harness 33, and-installing a position spaced below the top of the heat insulator 15, from the exhaust pipe 11 There is an advantage that the harness 33 can be separated from the upper lower surface of the heat insulator 15 in which the released hot air tends to accumulate, and thus the harness 33 can be more effectively prevented from being damaged by heat.

Furthermore, in the said embodiment, the harness front part 37 connected with the upper end of the up-and-down extending part 36 of the harness 33 arrange | positioned between the recessed part 45 of the heat insulator 15 and the tunnel part 12 is used for the said tunnel part. 12 so as to extend into the engine room 1 through the interior of the vehicle 12, so that the front part of the harness is led out into the engine room 1 through the lower part of the dash panel 3. can-installing been harness below the dash panel 3 during traveling of preventing the occurrence of a situation that damaged in contact with obstacles road, effectively protect the harness front 37.

  Moreover, in the said embodiment, as shown in FIG.2 and FIG.9, the 1st, 2nd catalysts 13 and 14 which are larger diameter and high temperature than the tubular part of this exhaust pipe 11 are provided in the front part of the said exhaust pipe 11. As shown in FIG. The vertically extending portion 36 of the harness 33 is disposed at a position shifted rearward from the maximum width portion of the first catalyst 13 and shifted forward from the maximum width portion of the second catalyst 14. Thus, the vertically extending portion 36 of the harness 33 can be compactly disposed in the limited space of the tunnel portion 12, and the influence of high heat generated in the first and second catalysts 13, 14 is the above. There is an advantage that it is possible to effectively prevent the harness 33 from reaching the vertically extending portion 36 of the harness 33 and to further effectively prevent the harness 33 from being damaged by heat.

  Further, as shown in the above-described embodiment, a silencer, SCR (not shown) is provided on the rear side of the vertically extending portion 36 of the harness 33 of the first catalyst 13 and the second catalyst 14 disposed in the front portion of the exhaust pipe 11. When a structure having a large-diameter function portion of the exhaust pipe 11 including a urea selective reduction catalyst system), a DPF (diesel particulate collection filter), a heat exchanger or a pipe assembly portion is provided, the large-diameter function portion It is possible to arrange the various large-diameter functional units in a compact and appropriate manner while preventing the influence of the high heat generated in step 1 from reaching the vertically extending portion 36 of the harness 33.

  Further, as shown in FIGS. 9 and 10, in a vehicle lower body structure in which a tunnel cross member 46 extends in the vehicle width direction along the inner wall surface of the tunnel portion 12, the front side of the tunnel cross member 46 is provided. When the vertically extending portion 36 of the harness 33 is disposed in the tunnel portion 12, the tunnel cross member 46 reinforces the tunnel portion 12 and sufficiently secures the rigidity thereof, while the harness 33 is placed in the tunnel portion 12. There is an advantage that the vertically extending portion 36 is disposed compactly and can be protected appropriately and effectively.

Furthermore, in the above embodiment, as shown in FIGS. 3 and 4, the lower surface extends in the front-rear direction of the vehicle along the lower surface of the floor panel 4 with the lower surface protruding downward from the lower end of the tunnel portion 12. in the lower vehicle body structure of a vehicle having a frame member comprising a floor frame 17 or tunnel lower frame 18, because of the-installing so as to position the harness rear 34 upper than the lower surface of the frame member, the harness rear 34 vehicle The harness rear portion 34 can be effectively protected by the frame member so as not to be damaged by contact with an obstacle on the road surface during traveling.

  Further, as shown in FIGS. 4 to 7, a stepped portion 20 is formed by recessing the front lower surface of the frame member formed of the tunnel lower frame 18 above the rear lower surface, and the stepped portion The rear portion 22 of the subframe 21 is attached to the front portion of the vehicle 20 and extends in the vehicle width direction extending in the vehicle width direction from the front end portion of the harness rear portion 34 toward the tunnel portion 12 side along the rear edge portion of the subframe 21. In the case where the structure is provided with the installation portion 35, the subframe 21 can be prevented from projecting greatly downward from the floor panel 4, and obstacles flying from the front when the vehicle travels can be prevented. The harness 33 is prevented from coming into contact with the vehicle width direction extending portion 35 of the harness 33, and the harness front portion 37 including the vehicle width direction extending portion 35 of the harness 33 is effective by the subframe 21. There is an advantage in that manner can be protected.

In particular, as shown in the above embodiment, the harness rear 34 while-installing in the vehicle width direction outer side than the installation portion of the frame member composed of a tunnel lower frame 18, below the stepped raised portion 20 of the frame member When the front end portion of the harness rear portion 34, that is, the vehicle width direction extending portion 35 of the harness 33 is extended to the inner side in the vehicle width direction, the inner portion is disposed in the tunnel portion 12. The harness rear portion 34 is separated from the exhaust pipe 11 to effectively prevent the harness rear portion 34 from receiving heat damage to the exhaust pipe 11, and the vehicle width direction extending portion 35 of the harness 33 is provided on the floor panel 4. without projecting downward, it can be advantageously properly-installing draw in the tunnel portion 12.

  Moreover, in the said embodiment, as shown in FIG. 5 etc., it is the vicinity of the insertion hole 24 and the spacer 25 which were formed in the sub-frame 21, Comprising: The bead part 31 dented below on the front side is set to the width direction The bead portion 31 and the reference pin 26 provided in the subframe 21 and the reference hole 30 provided in the stepped-up portion 20 of the tunnel lower frame 18 are installed at the time of a frontal collision of the vehicle. Since the drop-off promoting portion that promotes the rear portion 22 of the subframe 21 to drop downward is configured, damage to the harness 33 at the time of a frontal collision of the vehicle can be more effectively prevented.

  That is, when a large impact load that presses the sub-frame 21 toward the rear of the vehicle is input during a frontal collision of the vehicle, as shown in FIG. The rear portion 22 of the sub-frame 21 supported by the rear portion is retracted, and the reference pin 26 is retracted correspondingly, so that the reference hole 30 provided in the raised portion 20 of the tunnel lower frame 18 is expanded. As a result, the supporting rigidity of the weld nut 28 located near the reference hole 30 is significantly lowered.

  Further, as shown in FIG. 12, the rear portion 22 of the sub-frame 21 is deformed into a V-shape with the bead portion 31 as a base point in accordance with the pressing force for moving the sub-frame 21 backward. Is displaced rearward and the mounting bolt 23 is deformed so as to assume a forward leaning posture. As a result, as shown in FIG. 13, a large load acts in the direction in which the weld nut 28 to which the mounting bolt 23 is screwed is pulled out from the raised portion 20 of the tunnel lower frame 18, and as shown in FIG. The rear portion 22 of the subframe 21 is facilitated to drop downward.

  When the rear portion 22 of the sub-frame 21 is thus facilitated to drop downward during a frontal collision of the vehicle in this way, the reverse of the power train composed of the engine 8 and the transaxle device 9 is 21, and the front side frame 5 is gradually plastically deformed in accordance with the retreat of the power train, so that the impact energy input at the time of the frontal collision of the vehicle can be effectively absorbed. it can. Then, by dropping the rear portion 22 of the subframe 21 downward, the rear portion 22 of the subframe 21 is prevented from interfering with the vehicle width direction extending portion 35 of the harness 33 disposed behind the subframe 21. Thus, there is an advantage that damage to the harness 33 can be effectively prevented.

  Note that a drop-off promoting portion that promotes the drop-out of the sub-frame 21 is provided by the bead portion 31 and the reference pin 26 provided in the sub-frame 21 and the reference hole 30 provided in the step-up portion 20 of the tunnel lower frame 18. Instead of the above-described embodiment, the drop-off promoting portion may be configured by only one of them.

  Further, instead of the above configuration, the rear portion 22 of the subframe 21 and the vehicle body side member facing this in the vehicle front-rear direction are provided with interference portions that interfere with each other when the subframe 21 is retracted, and at least one of the interference portions, A conventional well-known guide structure (for example, refer to Japanese Patent Application Laid-Open No. 2008-126996) described above that forcibly guides the subframe 21 that moves backward in the event of a vehicle collision by providing a guide portion that is inclined to the lower rear side of the vehicle. It is good also as a structure provided in the position different from the installation part of the harness 33, and before the harness 33 and the sub-frame 21 collide. In this configuration, for example, the front-rear distance between the interference parts is made shorter than the front-rear distance between the sub-frame 21 and the harness 33, or the interference parts are installed at positions where they are in contact with each other in advance. By guiding the rear portion 22 of the subframe 21 along the guide portion to the lower rear side of the vehicle at the time of a collision, the rear portion 22 of the subframe 21 can be prevented from interfering with the harness 33.

  Further, in place of the combination of the reference pin 26 and the reference hole 26, a combination of a pin, a bolt, a rivet, or a claw portion in which a part of the subframe 21 is projectingly deformed and an opening that does not have a positioning reference function. Or, in the vicinity of the mounting bolt for attaching the rear portion 22 of the sub-frame 21, preferably a fragile portion such as a U-shaped or four-sided opening, a thin-walled portion, etc. You may comprise so that the fall of the rear part 22 of the said sub-frame 21 may be accelerated | stimulated by easily removing a mounting bolt from the said fastening part according to the impact load which acts sometimes.

DESCRIPTION OF SYMBOLS 1 Engine room 2 Car compartment 3 Dash panel 4 Floor panel 11 Exhaust pipe 12 Tunnel part 13,14 Catalyst 15 Heat insulator 17 Floor frame (frame member)
18 Tunnel lower frame (frame member)
20 Raised part 21 Subframe 26 Reference pin (drop-off promoting part)
30 Reference hole (drop-off promotion part)
31 Bead part (drop-off promotion part)
33 Harness 34 Harness rear portion 36 Vertically extending portion 37 Harness front portion 45 Recessed portion 46 Tunnel cross member

Claims (9)

A dash panel that partitions the engine room of the vehicle and the vehicle compartment behind it, a floor panel that extends from the lower end of the dash panel to the rear side of the vehicle, and a center in the vehicle width direction of the floor panel upward a tunnel portion which is bulged to an exhaust pipe which extends a lower portion of the floor panel in the longitudinal direction of the vehicle along the tunnel portion, is-installing in the longitudinal direction along the lower surface of the floor panel And a heat insulator that covers the exhaust pipe installation portion from above, and a part of the side surface of the heat insulator is disposed in the vehicle width direction. A recessed portion recessed into the inner side of the heat insulator is formed in a space formed between the recessed portion of the heat insulator and the tunnel portion, and the upper portion of the tunnel portion. The harness is disposed at a position spaced below the surface, and the harness includes a rear portion of the harness disposed below the exhaust pipe, and a recessed portion and a tunnel portion of the heat insulator from the front end portion of the harness rear portion. A vertically extending portion that extends upward through a space portion formed between the exhaust pipe and the upper portion of the exhaust pipe adjacent to the vehicle width direction of the exhaust pipe. A lower vehicle body structure for a vehicle, comprising: a harness front portion extending from the upper end of the portion into the engine room through the tunnel portion. The harness, the vehicle bottom structure according to claim 1, characterized in that it is-installing at a position spaced below the top of the heat insulator.   A catalyst that is larger in diameter and higher in temperature than the tubular portion of the exhaust pipe is disposed at the front portion of the exhaust pipe, and the harness is vertically extended at a position shifted forward or backward from the maximum width portion of the catalyst. The lower body structure of a vehicle according to claim 1, wherein an installation portion is provided.   4. The lower body structure of a vehicle according to claim 3, wherein a large-diameter functional portion of the exhaust pipe is provided at a rear side portion of the exhaust pipe catalyst and the vertically extending portion of the harness.   The tunnel cross member is extended in the vehicle width direction along the inner wall surface of the said tunnel part, and the up-and-down extension part of the said harness is arrange | positioned in the front side of this tunnel cross member. The lower body structure of a vehicle according to any one of the above. A frame member extending in the front-rear direction of the vehicle along the lower surface of the floor panel in a state where the lower surface protrudes downward from the lower end of the tunnel portion, and the harness rear portion is located above the lower surface of the frame member lower vehicle-body structure of a vehicle according to any one of claims 1 to 5, but is characterized in that the arrangement search. A stepped portion is formed in which the lower surface of the front portion of the frame member is recessed above the lower surface of the rear portion, and the rear portion of the subframe is attached to the front portion of the raised portion, and the rear portion of the subframe is attached. lower vehicle-body structure of a vehicle according to claim 6, characterized in that the harness front is-installing so as to extend in the vehicle width direction to the tunnel portion side from the front end of the rear the harness along the edge. Together with the frame said harness rear in the vehicle width direction outer side than the installation portion of the member is-installing, in the vehicle width direction inner side through the lower side of the stepped raised portion of the frame member from the front end of the harness rear lower vehicle-body structure of a vehicle according to claim 7, characterized in that the harness is-installing. The vehicle lower body structure according to claim 7 or 8, further comprising a drop-off promoting portion that promotes the rear portion of the subframe to drop downward during a frontal collision of the vehicle.

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