JP4626388B2 - Undercarriage of the vehicle - Google Patents

Description

  The present invention relates to a vehicle lower structure, and more particularly to a vehicle lower structure in which a canister is disposed in the vicinity of a fuel tank below a vehicle floor.

  In a vehicle, an engine and a transmission are mounted vertically in the front part of the vehicle, and fuel is placed at a position where the upper surface is covered with a floor in front of the rear axle of the vehicle and the left and right sides are sandwiched between a pair of subframes. A tank is provided, a recess extending in the front-rear direction of the vehicle is formed on the lower surface of the fuel tank, and an exhaust pipe connected to the engine and a propeller shaft connected to the transmission are extended to the rear of the fuel tank through the recess. There is a vehicle out.

  The canister is connected to the fuel tank by the evaporation pipe, temporarily absorbs the evaporated fuel generated in the fuel tank, and inhales and processes the evaporated fuel when the engine is operating, and releases the evaporated fuel to the outside of the vehicle. The amount is reduced. However, in order to reduce the amount of evaporated fuel released to the outside of the vehicle, it is desired to arrange a canister in the vicinity of the fuel tank so as to reduce the amount of permeation from the evaporation pipe and to use a large canister.

Conventionally, a lower structure of a vehicle is provided with a transfer and a canister located below the floor of the vehicle body, and by placing one of the canisters in an empty space on the backward trajectory of the other transfer, Some have made it possible to install large canisters.
Also, the canister arrangement structure shortens the purge passage by arranging a canister between the rear surface of the connecting wall connecting the front floor panel and the rear floor panel and the front surface of the fuel tank supported below the rear floor panel. There is something.
JP-A-5-193522 JP-A-8-58404

  By the way, conventionally, in the lower structure of the vehicle, a limited space below the floor is divided by the propeller shaft in the width direction of the vehicle, and it has been difficult to arrange a large canister in the vicinity of the fuel tank. . Further, when the canister is disposed so as to be adjacent to the exhaust pipe, the canister is excessively heated, and there is a disadvantage that the amount of adsorption of the evaporated fuel is reduced.

According to the present invention, an engine and a transmission are vertically mounted on a front portion of a vehicle including left and right side frames and a plurality of cross members communicating between the side frames, and the front side of the rear wheel axle of the vehicle. The fuel tank is disposed at a position where the upper surface is covered with the floor and the left and right sides are sandwiched between the both side frames, and a recess extending in the front-rear direction of the vehicle is formed on the lower surface of the fuel tank and connected to the engine. An exhaust pipe and a propeller shaft connected to the transmission are extended to the rear of the fuel tank through the recess, and between two cross members arranged immediately before the fuel tank among the plurality of cross members. A canister is disposed in a space in which the vehicle width direction is sandwiched between the propeller shaft and one of the side frames. Mounted on the vehicle body other by canister bracket covering the lower side of the canister, the bottom structure of a vehicle which is connected to an air suction filter through an air suction pipe in the vehicle width direction outer side end portion of the canister, in a plan view of the vehicle, the The space between the two side frames is widened so that the portion passing through the side of the canister is widest , and a heat shield plate facing the exhaust pipe is provided at the inner end of the canister bracket in the vehicle width direction. Is disposed at a position closer to the heat shield plate side than the one side frame in the vehicle width direction, while the outer end portion of the canister bracket in the vehicle width direction extends outward from the one side frame. Insert the air suction filter between the one side frame and the outer body panel. Characterized in that attached as writing.

  In the lower structure of the vehicle according to the present invention, the canister is disposed in a space sandwiched between the propeller shaft and the side frame in the vicinity of the front side of the fuel tank, and the distance between the side frames in the plan view of the vehicle is By setting it so that the part that passes through the side is widest, the length of the evaporation pipe connecting the fuel tank and the canister can be shortened, and the permeation amount of evaporated fuel from the evaporation pipe is reduced. A large canister can be installed to expand the space divided in the vehicle width direction by the propeller shaft and adsorb the evaporated fuel generated in the fuel tank. Can be reduced.

According to the present invention, it is possible to optimally arrange peripheral parts of the canister so that the length of the evaporation pipe can be shortened and a large canister can be arranged.
Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

  1 to 6 show a first embodiment of the present invention.

  1-3, 2 is a vehicle, 4 is a vehicle body, 6 is a body panel, 8L is a left side frame directed in the vehicle front-rear direction, and 8R is a right side facing the left side frame 8L directed in the vehicle front-rear direction. Side frames, 10F and 10F are front wheels, 10B and 10B are rear wheels, 12F is a front wheel axle, and 12B is a rear wheel axle. The left side frame 8L and the right side frame 8R are below the floor 14, and as front body members 16 and first to sixth cross members 18-1 to 18-6 oriented to the vehicle width direction, and rear parts as body members. It is connected with the member 20.

  As shown in FIG. 1, the body panel 6 includes a left side panel portion 6L along the left side frame 8L and a right side panel portion 6R along the right side frame 8R.

  An engine 22 and a transmission 24 connected to the rear portion of the engine 22 are vertically mounted on the front portion of the vehicle 2, and a transfer 26 connected to the rear portion of the transmission 24 is mounted. The transmission 24 and the transfer 26 are disposed in a floor tunnel 28 formed in a mountain shape that opens downward on the floor 14.

  An exhaust pipe 30 extending to the rear side of the vehicle 2 is connected to the engine 22. In addition, one end of a rear propeller shaft 32 extending to the rear side of the vehicle 2 is connected to the transfer 26. The other end of the rear propeller shaft 32 is connected to a rear differential 34 connected to the rear wheel axle 12B.

  A little behind the center part of the vehicle 2 in the front-rear direction, on the rear side of the vehicle 2 is in front of the rear wheel axle 12B, that is, between the fourth cross member 18-4 and the fifth cross member 18-5. The canister 36 is disposed at a position where the upper surface is covered with the floor 14 and the left and right sides are sandwiched between the pair of the left side frame 8L and the right side frame 8R, and the fifth cross member 18-5 and the sixth cross member 18- 6, a fuel tank 38 is disposed at a position where the upper surface is covered by the floor 14 and the left and right sides are sandwiched between the pair of left side frame 8L and right side frame 8R.

  As shown in FIGS. 1 to 3, the exhaust pipe 30 includes a first catalytic converter 40-1 on the engine 22 side of the front portion of the vehicle 2, and a second catalytic converter 40-2 at a central portion in the front-rear direction of the vehicle 2. A sub-muffler 42 is provided at a portion between the fourth cross member 18-4 and the fifth cross member 18-5, and below the floor 14 at a portion between the sixth cross member 18-6 at the rear portion of the vehicle 2 and the rear member 20. The main muffler 44 is connected to the main muffler 44.

  As shown in FIGS. 1 and 4, the canister 36 is disposed in the space 46 sandwiched between the rear propeller shaft 32 and the left side frame 8 </ b> L in the vicinity of the front side of the fuel tank 38, and is attached to the body panel 6 and the floor 14. It is supported by the attached canister bracket 48.

  Further, as shown in FIG. 1, in the plan view of the vehicle 2, the space between the left side frame 8 </ b> L and the right side frame 8 </ b> R, which are both side frames, is a space W that passes through the side of the canister 36. The interval W is set so as to be widest as compared with the front interval WF and the rear interval WB, and the canister 36 has a structure that is not easily affected by heat from the exhaust pipe 30.

  As shown in FIG. 4, a recess 50 extending in the front-rear direction of the vehicle 2 is formed on the lower surface of the fuel tank 38. The exhaust pipe 30 connected to the engine 22 and the rear propeller shaft 32 connected to the transmission 24 are passed through the recess 50 and extend to the rear of the fuel tank 38.

  As shown in FIG. 4, when the vehicle 2 is viewed from the rear, the recess 50 is formed in a mountain shape having an open bottom and is formed so as to substantially overlap the floor tunnel 28. The rear propeller shaft 32 is disposed in the vicinity of the mountain-shaped top 50P of the recess 50, and the sub-muffler 42 of the exhaust pipe 30 is below the rear propeller shaft 32 and to the right in the width direction of the vehicle 2. It is arranged at an offset position. The canister 36 is disposed on the side opposite to the side where the exhaust pipe 30 is biased with respect to the rear propeller shaft 32 in the width direction of the vehicle 2.

  As shown in FIG. 6, the canister 36 includes an evaporation pipe 52 connected to the fuel tank 38 on the side surface on the left side frame 8 </ b> L side, a purge pipe 54 connected to the engine 22 at the front of the vehicle 2, and a rear part of the vehicle 2. A switching valve / internal pressure sensor unit 60 is attached, and a heat shield plate 58 attached to the canister bracket 48 is disposed on the side surface on the rear propeller shaft 32 side. Yes. A harness 62 is connected to the switching valve / internal pressure sensor unit 60.

  Further, an air suction filter 64 is connected to the canister 36 via an air suction pipe 56. As shown in FIGS. 1 and 2, the air suction filter 64 is disposed at a position aligned with the canister 36 in the width direction of the vehicle 2 with the left side frame 8L interposed therebetween.

  As shown in FIGS. 4 and 5, the air suction filter 64 includes a filter element 68 in a filter case 66. The air suction pipe 56 includes a canister side air suction pipe 56-1 and an atmosphere side air suction pipe 56-2. The canister 36 and the canister bracket 48 are integrally attached to the upper surface.

  As shown in FIG. 6, the canister bracket 48 has a rectangular shape in which peripheral parts such as the canister 36, air suction filter 64, switching valve / internal pressure sensor unit 60 and the like are collectively installed on the upper surface and the lower surface of each of these parts is covered. Lower member 70, left side mounting portions 72L-1 and 72L-2 rising from the left front and rear corner portions of lower member 70, and right side mounting portion 72R rising from the right front and rear corner portions of lower member 70 -1, 72R-2, a left bracket portion 74L connected to the front left side mounting portion 72L-1 of the vehicle 2, a right side bracket portion 74R connected to the front right side mounting portion 72R-1 of the vehicle 2, And a frame recess 76 that allows the left side frame 8L to pass therethrough.

  In the canister bracket 52, the left side mounting portions 72L-1 and 72L-2 on the left side of the vehicle 2 are mounted on the left standing upper portion 6G of the body panel 6 with mounting bolts 78 as fixtures. The right attachment portions 72R-1 and 72R-2 are attached to the lower surface of the floor 14. In FIG. 5, reference numeral 80 </ b> L denotes a left pillar that rises from the left standing upper part 6 </ b> G of the body panel 6.

  Next, the operation of the first embodiment will be described.

  As shown in FIGS. 1 and 2, the canister 36 is disposed in a space 46 sandwiched between the rear propeller shaft 32 and the left side frame 8 </ b> L in the vicinity of the front side of the fuel tank 38. The space between the left side frame 8L and the right side frame 8R is widened so that the portion passing through the side of the canister 36 is widest in the width W. Accordingly, the canister 36 extending in the width direction of the vehicle 2 is disposed in the vicinity of the fuel tank 38, and the length of the evaporation pipe 52 that connects the fuel tank 38 and the canister 36 can be shortened. The amount of permeated fuel can be reduced.

  In addition, a space 46 divided in the width direction of the vehicle 2 can be expanded by the rear propeller shaft 32, and a large canister 36 having a capacity sufficient to adsorb evaporated fuel by the fuel tank 38 can be disposed. Thus, the amount of evaporated fuel adsorbed can be increased, and the amount of evaporated fuel released to the outside of the vehicle can be reduced.

  Further, as shown in FIG. 4, the recess 50 formed on the lower surface of the fuel tank 38 is formed in a mountain shape opened downward, the rear propeller shaft 32 is disposed in the vicinity of the mountain-shaped top portion 50 </ b> P, and the exhaust pipe 30. The sub muffler 42 is disposed at a position below the rear propeller shaft 32 and offset in the width direction of the vehicle 2, and the canister 36 is disposed on the side where the exhaust pipe 30 is offset in the width direction of the vehicle 2. Are arranged on the opposite side. Accordingly, the canister 36 is disposed at a position away from the exhaust pipe 30 and the heat shield plate 58 is attached to the side surface of the canister 36 on the side close to the exhaust pipe 30, so that the canister 36 is excessively heated. And the amount of evaporated fuel adsorbed to the canister 36 can be increased, and the amount of evaporated fuel released to the outside of the vehicle can be reduced.

  Furthermore, an air suction filter 64 connected to the canister 36 via an air suction pipe 56 is disposed at a position facing the canister 36 across the left side frame 8L in the width direction of the vehicle 2. Thereby, the length of the air suction pipe 56 can be shortened, the passage resistance of the air suction pipe 56 can be reduced, and the evaporated fuel generated in the fuel tank 38 can be easily adsorbed to the canister 36. The size of the air suction filter 64 can be increased by utilizing the space formed between the left side frame 8L and the left side panel portion 6L, and the life of the air suction filter 64 can be extended.

  The canister 36 and the air suction filter 64 are integrally attached to the vehicle 2 with a canister bracket 48 that covers the lower surface. As a result, the canister 36 and the air suction filter 64 can be protected from stepping stones by the canister bracket 48, and the peripheral parts of the canister 36 are collectively arranged on the upper surface of the canister bracket 48 as shown in FIG. Can be used effectively.

  As a result, the canister 36 is disposed in the space 46 sandwiched between the rear propeller shaft 32 and the left side frame 8L in the vicinity of the front side of the fuel tank 38, and the left side frame 8L and the right side in the plan view of the vehicle 2. The space between the side frames 8R is widened so that the portion passing through the side of the caster 36 is widest in the width W, thereby optimizing the arrangement of the peripheral components of the canister 36, and the fuel tank 38 and the canister 36, the length of the evaporation pipe 52 that communicates with the fuel pipe 36 can be shortened, the amount of evaporated fuel permeated from the evaporation pipe 52 can be reduced, and the space divided in the width direction of the vehicle 2 by the rear propeller shaft 32 can be expanded. In addition, a large-sized canister 36 sufficient to adsorb the evaporated fuel generated in the fuel tank 38 can be disposed, thereby reducing the amount of evaporated fuel released outside the vehicle. It is possible.

  Further, when the vehicle 2 is viewed from the rear, the concave portion 50 is formed in a mountain shape having an open bottom, the rear propeller shaft 32 is disposed in the vicinity of the mountain-shaped top portion 50P, and the exhaust pipe 30 is connected to the rear propeller shaft 32. The canister 36 is disposed on the side opposite to the side where the exhaust pipe 30 is biased with respect to the rear propeller shaft 32 in the width direction of the vehicle 2. As a result, the canister 36 can be disposed at a position away from the exhaust pipe 30, and the canister 36 can be prevented from being heated excessively. Reduce the amount of evaporated fuel released to

  Further, an air suction filter 64 connected to the canister 36 via an air suction pipe 56 is disposed at a position aligned with the canister 36 in the width direction of the vehicle 2 with the left side frame 8L interposed therebetween, so that it is adjacent to the canister 36. The air suction filter 64 is disposed at a position where the air suction pipe 56 can be shortened, the passage resistance of the air suction pipe 56 is reduced, and the evaporated fuel generated in the fuel tank 38 is adsorbed to the canister 36. In addition, the air suction filter 64 can be enlarged, and the life of the air suction filter 64 can be extended.

  FIG. 7 shows a special configuration of the present invention and shows a second embodiment.

  In the following embodiments, portions having the same functions as those of the first embodiment will be described with the same reference numerals.

  The features of the second embodiment are as follows. That is, on the lower member 70 on the rear propeller shaft 32 side of the canister bracket 48, the heat shield plate 58 is disposed on the rear propeller shaft 32 side by being separated from the end surface of the canister 36 by the extension portion 82. An air circulation space 84 was formed between the end face of the heat shield plate 58 and the heat shield plate 58. In addition, an air introduction plate 86 is provided on the front side of the heat shield plate 58 so as to be directed to the right side of the vehicle 2 and actively guide the traveling wind into the air circulation space 84.

  According to the configuration of the second embodiment, the canister 36 is effectively prevented from being excessively heated by the traveling wind passing through the air circulation space 84 formed by the heat shield plate 58 and the end face of the canister 36. can do.

  FIG. 8 shows a special configuration of the present invention and shows a third embodiment.

  The features of the third embodiment are as follows. That is, the lower member 70 on the front side of the canister bracket 48 is provided with a protective cover 92 that covers each of the peripheral components such as the canister 36 and the switching valve / internal pressure sensor unit 60 and the front side of the vehicle 2. The protective cover 92 includes a front cover portion 94 that covers the front side of the canister 36 and the switching valve / internal pressure sensor unit 60 and the like, and an upper cover portion 96 that covers the upper side of the canister 36 and the switching valve / internal pressure sensor unit 60 and the like.

  According to the configuration of the third embodiment, the protective cover 92 can easily protect each peripheral component such as the canister 36 and the switching valve / internal pressure sensor unit 60 from a stepping stone or the like.

  Optimization of parts arranged around the canister can be applied to various vehicles.

It is a top view of vehicles in the 1st example. It is a side view of a vehicle in the 1st example. FIG. 3 is a bottom view of the rear portion of the vehicle according to an arrow III in FIG. 2 in the first embodiment. FIG. 4 is a cross-sectional view as seen from the rear side of the vehicle according to an arrow IV-IV in FIG. It is the figure seen from the back side of vehicles of a canister part in the 1st example. It is a perspective view of a canister part in the 1st example. It is a perspective view of a canister part in the 2nd example. It is a perspective view of a canister part in the 3rd example.

Explanation of symbols

2 Vehicle 8 Side frame 14 Floor 22 Engine 24 Transmission 30 Exhaust pipe 32 Rear propeller shaft 36 Canister 38 Fuel tank 46 Space 48 Canister bracket 50 Recess 52 Evaporation pipe 54 Purge pipe 56 Air suction pipe 64 Air suction filter

Claims (2)

An engine and a transmission are vertically mounted on the front portion of a vehicle having left and right side frames and a plurality of cross members communicating between the side frames, and the upper surface is floored in front of the rear axle of the vehicle. the fuel tank is disposed at a position with the left and right sides are sandwiched the side frames covered, and this on the lower surface of the fuel tank to form a recess extending in the longitudinal direction of the vehicle, an exhaust pipe connected to the engine A propeller shaft connected to the transmission extends through the recess to the rear of the fuel tank, and the propeller shaft between two cross members disposed immediately before the fuel tank among the plurality of cross members. A canister is disposed in a space sandwiched between the side frame and one of the side frames in the vehicle width direction. Attached to the vehicle body by the canister bracket covering the lower static, in the lower structure of a vehicle which is connected to an air suction filter through an air suction pipe in the vehicle width direction outer side end portion of the canister, in a plan view of the vehicle, the side frames The space between the canisters is widened so that the portion passing through the side of the canister is widest , and a heat shield plate facing the exhaust pipe is provided at the inner end of the canister bracket in the vehicle width direction. The canister bracket is disposed at a position closer to the heat shield plate side than the one side frame in the direction, and the outer end of the canister bracket in the vehicle width direction is extended outward from the one side frame and the air Insert the suction filter between the one side frame and the outer body panel. Substructure of the vehicle, characterized in that Attach. 2. The vehicle lower structure according to claim 1, wherein the canister includes a switching valve / internal pressure sensor unit at an outer end in a vehicle width direction .

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