vehicle

Abstract

A vehicle (1) comprises: an exhaust pipe (7) which is lead out from the engine of the vehicle; a tank (10) which stores an additive for purification of the exhaust of the vehicle (1); and a spare tire (6) which is attached to a first frame (4) that is towards the rear of the vehicle (1). The vehicle has a body configuration in which the tank (10) and an opening (9) of the exhaust pipe (7) are disposed at positions that oppose each other, with the spare tire (6) therebetween in the width direction of the vehicle (1).

Description

[Technical field]

[0001] The present invention relates to a vehicle equipped with a urea water tank. [Background technology]

[0002] One method for purifying nitrogen oxides (NOx) in exhaust gas emitted from diesel engines is to generate ammonia (NH3) by hydrolyzing urea water (urea aqueous solution) on a catalyst, and then selectively reduce and purify the nitrogen oxides contained in the exhaust gas using the generated ammonia. An exhaust purification device with this function is called urea selective catalytic reduction. Vehicles equipped with urea selective catalytic reduction are equipped with a urea water tank for storing urea water as an additive.

[0003] The urea water tank is provided with a tank body for storing urea water, a urea water injection pipe connected to the tank body, an atmosphere release valve for releasing the air inside the tank body to the atmosphere, a leveling valve for regulating the liquid level of the urea water stored inside the urea water tank, a urea water conveying means for sending the urea water to the catalyst side in appropriate amounts at a time, and a urea water supply pipe which is a passage for the sent-out urea water, etc. (For example, see Patent Document 1.) In addition, as the urea water conveying means, for example, there is one provided with a urea water pump having an outlet for discharging urea water sucked from an inlet installed in the bottom wall of the tank body below the tank body, and an arc-shaped liquid reservoir wall that rises from the bottom wall of the tank body and is provided to surround the urea water pump (for example, see Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2017-110620 [Patent Document 2] Japanese Patent Application Publication No. 2020-192876 Summary of the Invention [Problem to be solved by the invention]

[0005] In the inventions described in Patent Documents 1 and 2, the urea water tank is placed under the floor toward the rear of the vehicle (see Figure 3 in Patent Document 1 and Figure 1 in Patent Document 2). This position is close to the muffler (silencer) installed midway through the exhaust pipe and the exhaust outlet at the end of the exhaust pipe. For this reason, the tank is susceptible to thermal effects from the high-temperature components of the exhaust pipe and the exhaust gas released into the atmosphere, and depending on the driving conditions, the temperature of the urea water tank and the urea water inside it may rise excessively. Such problems of thermal effects are not limited to tanks that store urea water, but are also present in tanks that store other additives intended to purify exhaust gas.

[0006] Therefore, an object of the present invention is to suppress the thermal effect on a tank that stores an additive for purifying exhaust gas from an exhaust pipe and exhaust gas discharged from the exhaust pipe. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention employs a vehicle body structure comprising an exhaust pipe extending from an engine of a vehicle, a tank for storing an additive for purifying the exhaust of the vehicle, and a spare tire attached to a first frame near the rear of the vehicle, the tank and an opening of the exhaust pipe being positioned opposite each other across the spare tire in the width direction of the vehicle.

[0008] Here, a configuration may be adopted in which the tank, the spare tire, and the opening of the exhaust pipe are disposed rearward of the vehicle relative to an axle of a rear wheel provided on the vehicle.

[0009] In addition, a configuration can be adopted in which the tank includes an extension portion in which a pump portion that delivers additives toward the exhaust pipe is disposed, and the extension portion and an opening of the exhaust pipe are disposed opposite each other with respect to the center of the spare tire.

[0010] Alternatively, the tank can be configured to include an extension portion in which a pump portion that delivers additive toward the exhaust pipe is disposed, and a connection portion that extends from the extension portion toward the front side of the vehicle and leads to an additive injection port, and the connection portion and the opening of the exhaust pipe are positioned in overlapping positions in the fore-and-aft direction of the vehicle.

[0011] In each of these aspects, the vehicle may further include a pair of second frames extending along the fore-and-aft direction of the vehicle, the first frame may connect the pair of second frames to each other in the width direction of the vehicle, and the tank may be supported by one of the second frames and the first frame on the side of the spare tire.

[0012] In this case, a configuration can be adopted in which the first frame has a vehicle width direction member connecting a pair of the second frames, a first auxiliary frame protruding forward from the vehicle width direction member, and a second auxiliary frame protruding rearward from the vehicle width direction member, the tank is supported on the first frame via the first auxiliary frame and the second auxiliary frame, and a fixing point between the first auxiliary frame and the tank is located between a fixing point between the second auxiliary frame and the tank and a fixing point between the second frame and the tank in the vehicle width direction of the vehicle.

[0013] In addition, a configuration can be adopted in which a fixing point between the second auxiliary frame and the tank and a fixing point between the second frame and the tank are arranged at positions that overlap in the front-rear direction of the vehicle.

[0014] In each of these aspects, a configuration may be adopted in which the rear end of the exhaust pipe is inclined downward as it approaches the opening, and a configuration may be adopted in which the edge of the opening of the exhaust pipe is formed along a horizontal direction. Effect of the Invention

[0015] According to the present invention, it is possible to suppress the thermal effect on the tank that stores the additive. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a bottom view of a vehicle according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a plan view of the urea tank and its accessories mounted on the vehicle shown in FIG. [Diagram 3] Cross-sectional view of the urea tank in Figure 2 [Figure 4] 1 is a bottom view showing a mounting structure of a urea water tank to a vehicle; [Diagram 5] FIG. 2 is an enlarged cross-sectional view showing a structure for mounting a urea water tank to a vehicle; [Figure 6] Perspective view of urea water tank [Figure 7] A side view showing the vicinity of the exhaust pipe opening DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An embodiment of the present invention will be described with reference to the drawings. A vehicle 1 is equipped with a diesel engine, and is equipped with a urea selective catalytic reduction (urea SCR (Selective Catalytic Reduction) system) to purify nitrogen oxides in the exhaust emitted from the engine. The urea selective catalytic reduction system is a system in which urea water is injected into an exhaust pipe 7 through which exhaust gas passes as an additive for exhaust purification, and nitrogen oxides are reduced to nitrogen on a catalyst using ammonia produced by hydrolysis of the urea water as a reducing agent and then discharged. The system is applied to vehicles equipped with diesel engines and lean burn engines for which nitrogen oxide emissions are a problem.

[0018] As shown in Fig. 1, the body structure of the vehicle 1 is a structure in which a body is attached onto a frame including two second frames 2, 2 (hereinafter, in the embodiment, referred to as side members 2, 2) extending in the front-rear direction (hereinafter, simply referred to as the front-rear direction) of the vehicle 1, and a first frame 4 (hereinafter, in this embodiment, referred to as a cross member 4) connecting the side members 2, 2 in the width direction of the vehicle 1 (hereinafter, referred to as the vehicle width direction). The side members 2, 2 are present under the floor at least near the rear of the vehicle 1, and are disposed at intervals in the vehicle width direction. The cross members 4 are provided at multiple locations along the front-rear direction. A floor panel constituting a part of the body is fixed to the upper surfaces of the side members 2, 2.

[0019] FIG. 1 is a schematic bottom view of the vehicle from below. FIG. 1 illustrates only one cross member 4 located rearward of an axle (drive shaft) 5 disposed between left and right rear wheels 3, 3, and does not illustrate the other cross members 4. Also, only the side members 2, 2 are shown at least near the rear of the vehicle 1. In this embodiment, a differential is disposed between the left and right axles 5, 5, and a propeller shaft and a transmission are connected to the differential in this order toward the front side. In the embodiment, the rear wheels 3, 3 are drive wheels, but there is also a case where the rear wheels 3, 3 are not drive wheels and the front wheels are drive wheels.

[0020] An emergency tire wheel 6 (hereinafter referred to as the spare tire 6) is stored under the floor near the rear of the vehicle 1. The spare tire 6 is detachably suspended and fixed to the cross member 4 rearward of the drive shaft 5 via a predetermined fastener (e.g., bolts and nuts, etc.) as shown in Fig. 1. In some cases, the spare tire 6 can be raised and lowered by winding up and down a chain.

[0021] In addition, as shown in FIG. 1, an exhaust pipe 7 drawn from the engine is disposed under the floor of the vehicle 1. In the exhaust pipe 7, an exhaust purification device 50 consisting of urea selective catalytic reduction, a muffler (silencer) 8, and the like are disposed along the flow direction of the exhaust gas. The muffler 8 and an opening 9 at the end of the exhaust pipe 7 are disposed closer to the side member 2 on either side of the center line in the vehicle width direction of the vehicle 1 (in the embodiment, the side member 2 on the right side in the vehicle width direction). Here, the exhaust purification device 50 is a part of the above-mentioned urea selective catalytic reduction system. In the exhaust pipe 7 (including in the exhaust purification device 50), a nozzle (not shown) for injecting urea water is disposed. The nozzle for injecting urea water is generally disposed upstream of the exhaust purification device 50, but the injection position is appropriately selected depending on the specifications.

[0022] Further, in order to supply urea water into the exhaust pipe 7, the vehicle 1 is equipped with a tank 10 (hereinafter referred to as the urea water tank 10) that stores a certain amount of urea water.

[0023] The urea water tank 10 is a molded product made of a metal with excellent corrosion resistance, such as stainless steel, or a resin, such as polyethylene or polypropylene, or a fiberglass reinforced plastic (FRP), etc. Also, it may be made by integrally molding a plurality of molded members by a well-known method, such as welding, adhesion, or fusing.

[0024] As shown in Figures 1 and 2, the urea water tank 10 includes a tank body 11 having a hollow portion therein, and a plurality of brackets 20 protruding laterally from the tank body 11. In this embodiment, the tank body 11 is formed into a hollow tank body 11 by joining a concave lower member 15 that opens upward and a concave upper member 16 that opens downward (see Figure 6). The brackets 20 are provided on the upper member 16. As shown in Figures 4 and 5, the urea water tank 10 is detachably attached to the underside of a floor panel by fastening the brackets 20 to a vehicle member (frame F) with fixing means A such as bolts and nuts.

[0025] 3 and 4, the urea water tank 10 is provided with a urea water conveying means (pump section) 12 that conveys urea water by a driving force of a motor or the like. In FIG. 3, reference numeral 12a denotes a pump body 12a constituting the urea water conveying means 12, and reference numeral 12b denotes a heater 12b that heats the urea water to an appropriate predetermined temperature. By the action of the pump body 12a, the urea water is conveyed from a discharge port 12c provided in the bottom wall of the tank body 11 through the urea water supply pipe 36 to the exhaust pipe 7. In a plan view of the urea water tank 10, the pump body 12a, the heater 12b, and the discharge port 12c are surrounded by a circular arc-shaped first liquid reservoir wall 13a rising from the bottom wall of the tank body 11, and a second liquid reservoir wall 13b protruding laterally from the first liquid reservoir wall 13a. The urea water passes through an arc-shaped passage formed between the first liquid reservoir wall 13a, the second liquid reservoir wall 13b, and the like, and is guided to the central pump body 12a.

[0026] A cover (not shown) is attached as a protective member to the lower part of the tank body 11 so as to cover the urea water transport means 12 and part or all of the tank body 11. The cover protects the urea water tank 10 from impact and preferably has a predetermined level of thermal insulation to prevent an excessive rise in the temperature of the urea water.

[0027] As shown in FIG. 2, a urea water injection pipe 31, a leveling pipe 32, and a vent pipe 33 are connected to the upper part of the urea water tank 10. The urea water injection pipe 31 is drawn from an injection port 31c provided at the front end of the connection part 11a of the urea water tank 10, and serves as a passage for leading urea water refilled from the outside through an inlet 31b of a urea water filler 31a provided at any position of the vehicle 1 into the tank body 11. The leveling pipe 32 serves as a passage for releasing the air inside the urea water tank 10 to the urea water filler 31a side when refilling the urea water. The vent pipe 33 serves as a passage for releasing the internal gas to the atmosphere when the pressure inside the urea water tank 10 increases. An atmosphere release valve for opening and closing the passage is provided in the middle of the vent pipe 33. The atmosphere release valve is opened when the internal pressure of the urea water tank 10 reaches or exceeds a set pressure. In addition, in FIG. 2, reference numeral 34 denotes a signal cable 34, and reference numeral 35 denotes a power cable 35.

[0028] 2 and 3, in a plan view, the tank body 11 is closed on all four sides by an outer wall 14a facing the side member 2, an arc-shaped inner wall 14b facing the spare tire 6, a front wall 14c closing the front side of the vehicle 1, and a rear wall 14d closing the rear side of the vehicle 1. The tank body 11 also includes a portion where the urea water conveying means (pump section) 12 is disposed, i.e., an expansion section 11c where the pump section 12 that delivers urea water toward the exhaust pipe 7 is disposed, and connection sections 11a and 11b that extend from the expansion section 11c toward the front side of the vehicle 1 and reach an inlet 31c for urea water from the outside. The expansion section 11c is wider in the vehicle width direction than the connection sections 11a and 11b, and forms a large space capable of accommodating the urea water conveying means (pump section) 12. The extension portion 11c is formed toward the rear of the urea water tank 10 so that the urea water can easily flow in when the vehicle 1 is tilted upward. To ensure this large space, the extension portion 11c utilizes a large space on the rear side of the vehicle 1 relative to the center O of the spare tire 6, which is circular in plan view (see FIG. 1). The center O of the spare tire 6 is the center position of the wheel of the spare tire 6.

[0029] As shown in Fig. 1, the urea water tank 10 and the opening 9 of the exhaust pipe 7 are disposed at positions facing each other across the spare tire 6 in the vehicle width direction. That is, in this embodiment, the urea water tank 10 is disposed to the left of the spare tire 6 in the vehicle width direction, and the opening 9 of the exhaust pipe 7 is disposed to the right of the spare tire 6 in the vehicle width direction. This suppresses the thermal effects of the high-temperature components of the exhaust pipe 7 and the exhaust gas released into the atmosphere, and prevents the temperature of the urea water tank 10 and the urea water therein from excessively increasing. Note that the urea water tank 10 and the opening 9 of the exhaust pipe 7 may be reversed, so that the urea water tank 10 is disposed to the right of the spare tire 6 in the vehicle width direction, and the opening 9 of the exhaust pipe 7 is disposed to the left of the spare tire 6 in the vehicle width direction.

[0030] Also, in this embodiment, the urea water tank 10, the spare tire 6, and the opening 9 of the exhaust pipe 7 are disposed rearward of the axle 5 of the rear wheels 3 of the vehicle 1. The area rearward of the axle 5 of the rear wheels 3 is a place where relatively few parts are arranged, and by using this large space with few parts as the exhaust gas release area, the thermal impact on the surrounding components, including the urea water tank 10, can be suppressed.

[0031] Furthermore, in this embodiment, the connection portions 11a, 11b of the urea water tank 10 and the opening 9 of the exhaust pipe 7 are arranged in positions that overlap in the front-rear direction. In other words, the connection portions 11a, 11b of the urea water tank 10 and the opening 9 of the exhaust pipe 7 are aligned in the vehicle width direction, which has the advantage of further increasing the distance between the extension portion 11c located rearward of the connection portions 11a, 11b and the opening 9 of the exhaust pipe 7.

[0032] In this embodiment, the extension portion 11c of the urea water tank 10 and the opening 9 of the exhaust pipe 7 are disposed opposite each other with the center O of the spare tire 6 in between. This opposing arrangement means that, in the front-to-rear direction of the vehicle 1, the opening 9 of the exhaust pipe 7 is located forward of the center O of the spare tire 6, and the extension portion 11c of the urea water tank 10 is located rearward of the center O of the spare tire 6, as shown in Fig. 1. By disposing them in this way, the distance between the extension portion 11c of the urea water tank 10 and the opening 9 of the exhaust pipe 7 can be further increased.

[0033] In addition, the symbol Q in FIG. 1 indicates the center Q of the urea water conveying means (pump section) 12. The rear edge of the opening 9 of the exhaust pipe 7 is located forward of the center Q by a distance L0 in the front-rear direction, and in order to reduce the thermal effect, it is preferable to ensure this distance L0 as long as possible. Furthermore, the symbol R in FIG. 1 indicates a position of the arc-shaped inner wall 14b of the urea water tank 10 facing the spare tire 6 side, which faces the center O of the spare tire 6 in the vehicle width direction. This position R is the portion where the inner wall 14b protrudes most outward in the vehicle width direction. In the embodiment, the rear edge of the opening 9 of the exhaust pipe 7 is located forward of this position R in the front-rear direction. Furthermore, the symbol P in FIG. 1 indicates the center position P of the urea water tank 10 in the front-rear direction. That is, the position P is a position corresponding to a distance L1 / 2 from the front end of the urea water tank 10 with respect to the total length L1 of the urea water tank 10 in the front-rear direction. The rear edge of the opening 9 of the exhaust pipe 7 is located a distance L2 forward of this position P in the front-rear direction, and in order to reduce the thermal effect, it is preferable to ensure this distance L2 as long as possible.

[0034] Furthermore, when the vehicle 1 is parked on a horizontal road surface, if the rear end of the exhaust pipe 7 is inclined downward, that is, if the rear end of the exhaust pipe 7 is inclined downward as it approaches the opening 9, the thermal effect on the surrounding components including the urea water tank 10 can be further suppressed. This is because, by discharging the exhaust gas downward (towards the road surface), heat can be released to the road surface as much as possible. In addition to or instead of this method of inclining the exhaust pipe 7 downward, for example, as shown in FIG. 7, the edge of the opening 9 of the exhaust pipe 7 may be formed along the horizontal direction. In this way, by cutting the edge of the opening 9 of the exhaust pipe 7 approximately parallel to the horizontal direction, the exhaust gas is discharged more significantly toward the road surface, and the transfer of heat to the road surface can be further promoted.

[0035] The structure for fixing the urea water tank 10 to the vehicle 1 will be described.

[0036] As described above, the vehicle 1 includes a pair of side members 2, 2 extending in the front-rear direction, and a cross member 4 connecting the side members 2, 2 in the vehicle width direction. The urea water tank 10 is supported on the side of the spare tire 6 by one of the side members 2 and the cross member 4 connecting the two side members 2, 2. The urea water tank 10 is stably fixed because it is supported by two members arranged in different directions.

[0037] In this embodiment, as shown in Fig. 4, the cross member 4 has a vehicle width direction member 40 that connects the side members 2, 2 to each other, a first auxiliary frame 41 that protrudes forward from the vehicle width direction member 40, and a second auxiliary frame 42 that protrudes rearward from the vehicle width direction member 40. The urea water tank 10 also has a first mounting portion 21 fixed to the first auxiliary frame 41, a second mounting portion 22 fixed to the second auxiliary frame 42, and a third mounting portion 43 fixed to the side member 2 as mounting portions for fixing the urea water tank 10 to the vehicle 1 (see also Fig. 6). The first mounting portion 21, the second mounting portion 22, and the third mounting portion 23 are formed integrally with the tank body 11. In the urea water tank 10, the first mounting portion 21 is fixed to the first auxiliary frame 41, the second mounting portion 22 is fixed to the second auxiliary frame 42, and the third mounting portion 43 is fixed to the side member 2 on either side (in this embodiment, the side member 2 on the left side in the vehicle width direction).

[0038] Hereinafter, the fixing point between the first auxiliary frame 41 and the first mounting portion 21 will be referred to as the first fixing point, the fixing point between the second auxiliary frame 42 and the second mounting portion 22 will be referred to as the second fixing point, and the fixing point between the side member 2 and the third mounting portion 23 will be referred to as the third fixing point. At each of the first fixing point, the second fixing point, and the third fixing point, the urea water tank 10 is fixed to the frame F on the vehicle body side (corresponding to the first auxiliary frame 41, the second auxiliary frame 42, and the side member 2) by well-known fixing means such as bolts and nuts. Here, the first fixing point, the second fixing point, and the third fixing point refer to each mounting portion of the first mounting portion 21, the second mounting portion 22, and the third mounting portion 23, the portion of the frame F that is in contact with each mounting portion, and the portion where fixing means such as bolts and nuts are located. FIG. 5 shows an example of a fixing structure at each fixing point.

[0039] In Fig. 5, the upper side in the figure indicates the upper side of the vehicle 1, and the lower side in the figure indicates the lower side of the vehicle 1. The first mounting portion 21, the second mounting portion 22, and the third mounting portion 23 are formed with holes 21a, 22a, and 23a, respectively. The lower parts of the holes 21a, 22a, and 23a are countersunk portions of a slightly large diameter into which the heads b of the bolts 41a, 42a, and 43a used as the fixing means A are inserted, and the upper parts of the holes 21a, 22a, and 23a are through holes B of a slightly small diameter into which the shafts a of the bolts 41a, 42a, and 43a used as the fixing means A are inserted. The bracket 20 is attached to the lower surface of the frame F, and the shafts a of the bolts 41a, 42a, and 43a are inserted from the bottom to the top. At this time, annular collars G, C are respectively interposed between the inner surface of the through hole B and the shaft portions a of the bolts 41a, 42a, 43a, and between the inner surface of the hole in the frame F and the shaft portions a of the bolts 41a, 42a, 43a. The urea water tank 10 is fixed to the vehicle 1 by screwing nuts E onto the shaft portions a of the bolts 41a, 42a, 43a from above the frame F and tightening them. The urea water tank 10 can be freely attached and detached from below the vehicle 1 via the fixing means A, facilitating work when replacing the tank, etc.

[0040] 4, in the embodiment, the first fixing point between the first auxiliary frame 41 and the first mounting portion 21 is disposed in the vehicle width direction between the second fixing point between the second auxiliary frame 42 and the second mounting portion 22 and the third fixing point between the side member 2 and the third mounting portion 23. That is, the triangle connecting the three fixing points, the first fixing point, the second fixing point, and the third fixing point, is an acute triangle with all three interior angles less than 90 degrees. This enables the urea water tank 10 to be supported more stably.

[0041] The extension portion 11c of the urea water tank 10 is wider than the connection portions 11a and 11b, and is heavier than the connection portions 11a and 11b. Therefore, the front side of the urea water tank 10 is supported at one location, the first fixing point, while the rear side of the urea water tank 10 is supported at two locations, the second fixing point and the third fixing point. In this case, if the second fixing point and the third fixing point are disposed at the same position in the front-rear direction of the vehicle 1, the stable support of the urea water tank 10 is further improved. In FIG. 4, the bolt 42a of the second fixing point and the bolt 43a of the third fixing point are slightly offset in the front-rear direction, but by completely matching the positions of both, further stable support can be expected. However, in FIG. 4, the second mounting portion 22 and the third mounting portion 23 overlap in their ranges in the front-rear direction of the vehicle 1. That is, the second fixing point and the third fixing point overlap in their ranges in the front-rear direction. Therefore, it is possible to expect substantially the same effect as when the bolts 42a and 43a are disposed at exactly the same position in the front-rear direction.

[0042] In the above embodiment, the additive for purifying exhaust gas is urea water, and the configuration of the present invention has been described by taking the urea water tank for storing the urea water as an example, but the present invention can also be applied to a tank for storing an additive other than urea water, etc. Examples of additives other than urea water include an aqueous ammonia solution.

[0043] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Furthermore, the components in the above-mentioned embodiments may be arbitrarily combined within the scope of the invention.

[0044] This application is based on a Japanese patent application (Patent Application No. 2022-059269) filed on March 31, 2022, the contents of which are incorporated by reference into this application. [Explanation of symbols]

[0045] 1 vehicle 2 Side member (second frame) 3 Rear wheel 4 Cross member (first frame) 5 axles 6 Spare tire 7. Exhaust pipe 9 aperture 10. Urea tank 11 Tank body 12 Pump section 11a, 11b Connection 11c Extension 20 Bracket 21 First mounting part 22 Second mounting part 23 Third mounting part 31c inlet 40 Vehicle width direction member 41 First auxiliary frame 42 Second auxiliary frame 50 Exhaust purification device

Claims

1. An exhaust pipe extending from an engine of a vehicle; A tank in which an additive for exhaust gas purification of the vehicle is stored; a spare tire attached to a first frame near the rear of the vehicle; Equipped with the tank and the opening of the exhaust pipe are disposed at positions facing each other with the spare tire interposed therebetween in a width direction of the vehicle, The tank includes an expansion portion in which a pump portion that pumps an additive toward the exhaust pipe is disposed, The opening of the exhaust pipe and the extension portion are disposed at different positions in the front-rear direction. A vehicle body structure characterized by:

2. 2. The vehicle body structure according to claim 1, wherein the tank, the spare tire, and the opening of the exhaust pipe are disposed rearward of an axle of a rear wheel provided on the vehicle.

3. 3. The vehicle body structure according to claim 1, wherein the extension portion and the opening of the exhaust pipe are disposed opposite to each other with respect to a center of the spare tire.

4. The tank includes a connection portion extending from the expansion portion toward the front side of the vehicle and leading to an additive injection port, 3. The vehicle body structure according to claim 1, wherein the connection portion and the opening of the exhaust pipe are arranged at positions that overlap with each other in the front-rear direction of the vehicle.

5. The vehicle further includes a pair of second frames extending along a front-rear direction of the vehicle, The first frame connects the pair of second frames to each other in a width direction of the vehicle, 3. The vehicle body structure according to claim 1, wherein the tank is supported by one of the second frames and the first frame on a side of the spare tire.

6. the first frame includes a vehicle width direction member connecting the pair of second frames, a first auxiliary frame protruding forward from the vehicle width direction member, and a second auxiliary frame protruding rearward from the vehicle width direction member, the tank is supported on the first frame via the first auxiliary frame and the second auxiliary frame, 6. The vehicle body structure according to claim 5, wherein a fixing point between the first auxiliary frame and the tank is disposed between a fixing point between the second auxiliary frame and the tank and a fixing point between the second frame and the tank in a width direction of the vehicle.

7. The vehicle body structure according to claim 6, wherein a fixing point between the second auxiliary frame and the tank and a fixing point between the second frame and the tank are arranged at positions that overlap in the fore-and-aft direction of the vehicle.

8. 3. The vehicle body structure according to claim 1, wherein a rear end portion of the exhaust pipe is inclined downward as it approaches the opening.

9. The vehicle body structure according to claim 8 , wherein an edge of the opening of the exhaust pipe is formed along a horizontal direction.

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