JP6524653B2 - Reductant tank mounting structure - Google Patents

Description

  The present invention relates to a reductant tank mounting structure of a selective catalytic reduction system for supplying reductant to the exhaust of an internal combustion engine.

  There is a selective catalytic reduction system which injects urea water into the exhaust gas of an internal combustion engine and purifies nitrogen oxides contained in exhaust gas. When this system is mounted on a vehicle, it is necessary to mount a reductant tank for storing a reductant such as urea water. If the vehicle body is small, such as an ordinary car, it is difficult to secure a consolidated space for the reducing agent tank because there are other on-vehicle parts that give priority to the layout.

  If a reducing agent tank is disposed in a portion leading to the inside of the vehicle, an offensive odor may be generated when the reducing agent urea water leaks, so it is desirable to arrange the reducing agent tank outside the vehicle. According to the reducing agent tank disposition structure disclosed in Patent Document 1, the reducing agent tank is disposed between the floor panel and the spare tire that is detachably attached below the floor panel. The reducing agent tank is installed using a space around the mounting position of the spare tire.

JP 2008-265689 A

  By the way, when the tire is held at the lower part of the vehicle body, it is easily damaged by external factors such as a rear collision by another vehicle, a heat damage by an exhaust system, a chipping by a spray, and the like. Thus, locating the reductant tank between the floor panel and the tire exposes the reductant tank to a similar vulnerable environment.

  If the reductant tank is damaged and the reductant leaks out, the system can not be supplied with reductant. If the system incorporates a safety device that prevents the internal combustion engine from being restarted if the reductant is not supplied, the vehicle will not be an internal combustion engine if the reductant tank is damaged even if it is a minor collision that does not affect the running of the vehicle. It will not be possible to restart the engine. Therefore, when the reductant tank is placed outside the vehicle, it needs to be protected so as not to be easily damaged in the situation where the vehicle travels.

  Therefore, the present invention provides a reducing agent tank mounting structure in which the reducing agent tank is disposed below the floor panel and protected from the outside.

The reducing agent tank mounting structure of the present invention comprises a floor panel, a tire carrier provided on the lower surface of the floor panel, a tire with the outer surface of the wheel facing downward and the tire held on the lower surface of the floor panel by the tire carrier A reductant tank which is arranged to be contained in a range enclosed by the panel and the tire and stores the reductant, and a hanging member provided on the lower surface of the floor panel and vertically suspending the reductant tank. There is.

Furthermore, it may further comprise a pump module for delivering the reducing agent. In this case, the hanger may extend from the lower surface of the floor panel toward the center of the reducing agent tank, and the pump module may be disposed near the center of the reducing agent tank together with the hanger . Alternatively, the pump module may be integrally formed with the reductant tank.

  According to the reducing agent tank mounting structure of the present invention, the reducing agent tank can be disposed outside the vehicle, and the reducing agent tank is protected by the floor panel and the tire. Will not be damaged.

  In addition, according to the reducing agent tank mounting structure further including the hanger, since the reducing agent tank can be easily moved up and down, the workability at the time of supplying the reducing agent is improved.

  Further, according to the reducing agent tank mounting structure further including the pump module, the reducing agent is delivered to be pushed out by the pump module. Therefore, since the inside of the piping to which the reducing agent is delivered is pressurized, the piping is not crushed and the reducing agent can be reliably delivered. At this time, if the pump module is integrally formed with the reducing agent tank, the pump module is always immersed in the reducing agent. When urea water is used as the reducing agent, urea can be prevented from being deposited inside the pump module to cause the pump module to malfunction.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the reducing agent tank mounting structure of the 1st Embodiment of this invention. Sectional drawing which cut | disconnected the reducing agent tank shown by FIG. 1 in the perpendicular direction at the center of a tire. The schematic diagram which shows the range enclosed by the floor panel and the tire in FIG. Sectional drawing of the state which rotated the tire shown by FIG. 2 to the 2nd tire position. FIG. 5 is a cross-sectional view of a state where the reducing agent tank shown in FIG. 4 is lowered to a second tank position. Sectional drawing which shows the reducing agent tank mounting structure of the 2nd Embodiment of this invention. Sectional drawing which shows the reducing agent tank mounting structure of 3rd Embodiment of this invention.

  The reducing agent tank mounting structure 10 according to the first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a perspective view seen from above the floor panel 2 provided flush with the rear of the vehicle 1. As shown in FIG. 1, the reducing agent tank mounting structure 10 is provided on the lower surface of the floor panel 2 of the vehicle 1.

  The reducing agent tank mounting structure 10 holds the reducing agent tank 14, which is an example of a reducing agent tank, together with the pump module 42 outside the vehicle by the hanger 43 so as to be contained in the range T. Here, the range T is a range enclosed by the floor panel 2 and the tire 13 mounted on the lower surface of the floor panel 2 as shown in FIG. The reducing agent tank 14 is protected by the floor panel 2 and the tire 13 from external impact and the like.

  For convenience of the description of the embodiment, "front (front)", "rear (rear)", "left" and "right" are defined based on the traveling direction of the vehicle 1, and "upper" and "lower" are defined based on gravity. Do. Further, in the present embodiment, the reducing agent tank 14 is formed in an annular shape as shown in FIG. Therefore, as shown in FIGS. 2 to 5, the direction radially extending from the central axis of the reducing agent tank 14 is defined as the radial direction R.

  The reducing agent tank mounting structure 10 includes a floor panel 2, a tire carrier 12, a tire 13, and a reducing agent tank 14 that stores urea water W. The tire carrier 12 is provided on the lower surface of the floor panel 2. The tire 13 is held by the tire carrier 12 on the lower surface of the floor panel 2 with the outer surface of the wheel 31 directed downward. The reducing agent tank 14 is disposed so as to fall within the range T enclosed by the floor panel 2 and the tire 13.

  On the lower surface of the floor panel 2 shown in FIG. 1, a cross member 3 which is a framework member of the vehicle 1, a rear end cross member 4, side members 5 and 6, and a tire carrier 12 are provided. The cross member 3 extends in the vehicle width direction near the rear wheels to reinforce the rigidity of the floor panel 2. The rear end cross member 4 extends in the vehicle width direction at the rear end portion of the vehicle 1 to alleviate a rear collision. The side members 5 and 6 extend in the vehicle length direction on the left and right sides of the floor panel 2 to reinforce the rigidity of the floor panel 2.

  As shown in FIG. 2, the tire carrier 12 includes brackets 22 and 23, carrier bars 24 and 25, an auxiliary carrier bar 26, and hooks 28.

  The brackets 22 and 23 are provided one each for the side member 5 which is a framework member and the cross member 3. The bracket may be either one or three or more.

  The carrier bars 24 and 25 are formed in a shape capable of supporting the outer side surface (outer side wall portion 36) of the tire 13 from the lower side of the vehicle 1 by appropriately bending a long bar made of metal, and the base end The parts are rotatably supported by the brackets 22 and 23, respectively. The tips of the carrier bars 24 and 25 cross each other, and the tip of the carrier bar 24 is supported by the tip of the carrier bar 25.

  The auxiliary carrier bar 26 is formed into a shape that can support the circumferential surface (tread portion 37) of the tire 13 by appropriately bending a long bar made of metal, and is fixed to the floor panel 2 by welding or the like. There is. The hooks 28 are suspended from the lower surface of the floor panel 2. The proximal end has a telescopic mechanism, and the distal end is formed in a bowl shape. The tip of the hook 28 is configured to be engageable with the tip of the carrier bar 25.

  As shown in FIG. 4, the tire 13 includes a wheel 31 and a rubber tire 32 provided on an outer peripheral portion of the wheel 31. The wheel 31 includes a disc portion 33 which is formed in a substantially disc shape which is gently curved, and a rim portion 34 which stands up from the peripheral edge of the disc portion 33, and is formed in a cylindrical shape closed at one end. The outer side surface of the wheel 31 is the side facing the outer side of the vehicle when the vehicle is mounted, for example, the side where the disc portion 33 extends from the rim portion 34. In addition, it is also a surface located on the opposite side to the side facing the reducing agent tank 14 in the disc portion 33.

  A rubber tire 32 is provided on the outer peripheral portion of the rim portion 34. The rubber tire 32 is formed in an annular shape having elasticity from a composite material including rubber or the like, and includes an inner sidewall portion 35, an outer sidewall portion 36, and a tread portion 37.

  As shown in FIG. 2, the inner and outer side wall portions 35 and 36 are bulged by high-pressure gas filled in the inside of the rubber tire 32 to a position slightly outward of the width of the wheel 31 in the direction along the rotation axis of the tire 13. . The tread portion 37 is formed to close between the outer peripheral edge of the inner sidewall portion 35 and the outer peripheral edge of the outer sidewall portion 36.

  The tire 13 is held at a first tire position A1 mounted on the lower surface of the floor panel 2 with the outer surface of the wheel 31 on the disc portion 33 side facing downward by the tire carrier 12.

  In the present specification, to fall within the range T enclosed by the floor panel 2 and the tire 13 means that the wheel is in a state in which the tire 13 in the transversely placed state is held at the first tire position A1, as shown in FIG. It is said that it is included in the space surrounded by the disk portion 33 which is the outer side surface 31, the rim portion 34 above the disk portion 33, the inner sidewall portion 35 of the tire 13 and the floor panel 2.

  As shown in FIGS. 4 and 5, the hanger 43 is connected to the hoisting device 51 fixed to the lower surface of the floor panel 2, the chain 52 hanging down from the hoisting device 51, and the hanging lower end of the chain 52. And a disc-shaped tray 53. The tray 53 can be raised or lowered by winding up or unwinding the chain 52 by operating the hoisting device 51. The reducing agent tank 14 is supported on the upper surface of the tray 53.

  In other words, the reducing agent tank mounting structure 10 is provided with the tire carrier 12 functioning as the first holding means, the hanger 43 functioning as the second holding means, and at least two holding means. As shown in FIGS. 2 to 5, the tire 13 is held on the floor panel 2 by the tire carrier 12 which is the first holding means, and the reducing agent tank 14 is the floor which is the hanging means 43 which is the second holding means. It is held by panel 2. The tire carrier 12 and the hanger 43 are mechanisms independent of each other.

  As shown in FIG. 2, the reducing agent tank 14 together with the pump module 42 for delivering the urea water W out of the reducing agent tank 14, as shown in FIG. 3, the inside of the wheel 31 of the tire 13 outside the vehicle and the floor panel 2. It is arrange | positioned so that it may be settled in the range T enclosed by, and the urea water W is stored. The reducing agent tank 14 is formed of an impact resistant resin or the like, and has a hollow and substantially annular shape including a bottom wall 61, an outer peripheral wall 62, an inner peripheral wall 63, and an upper wall 64.

  The bottom wall 61 includes a flat portion 65 supported by the tray 53 and a curved portion 66 extending from the periphery of the flat portion 65 along the disk portion 33. The outer peripheral wall 62 extends from the outer peripheral edge of the bottom wall 61 and is formed in a curved shape following the inner peripheral surface of the wheel 31 and the inner sidewall portion 35 of the tire 13.

  The inner peripheral wall 63 surrounds the outer periphery of the chain 52 and extends from the inner peripheral edge of the bottom wall 61 along the outer shape of the pump module 42. That is, the pump module 42 is disposed near the center (inner side) together with the chain 52 in the radial direction R, and is mounted at a stable position close to the hanger 43. A hole 71 communicating with the inside and the outside of the reducing agent tank 14 is formed in the inner peripheral wall 63, and a suction passage 72 extending from the pump module 42 to the lower part of the bottom wall 61 is inserted into the hole 71.

  The upper wall 64 is formed to close between the upper edge of the outer peripheral wall 62 and the upper edge of the inner peripheral wall 63. An inlet 73 is formed in the upper wall 64 so as to face the floor panel 2 in order to replenish the urea water W. The inlet 73 is sealed by a removable lid 74.

  The pump module 42 is disposed together with the reducing agent tank 14 so as to fall within the range T shown in FIG. The pump module 42 supplies urea water W to the selective catalytic reduction system through a pipe 75 extending to the exhaust system from the space between the floor panel 2 and the upper wall 64 of the reducing agent tank 14.

  In the reducing agent tank mounting structure 10 configured as described above, the procedure for lowering the reducing agent tank 14 from the first tank position B1 where the reducing agent tank 14 is disposed in the range T will be described using FIGS. 2 to 5. explain.

  In order to lower the reducing agent tank 14 shown in FIG. 2 and supply the reducing agent tank 14 with urea water W, as shown in FIG. 4, the base end of the hook 28 is extended and the engagement between the carrier bar 25 and the hook 28 Cancel the match. The carrier bars 24, 25 are pivoted downward to move the tire 13 to the second tire position A2.

  As shown in FIG. 5, the tire 13 is removed from the tire carrier 12, and the hanger 43 is unwound to move the reducing agent tank 14 to the second tank position B2. The lid 74 is removed from the inlet 73 and the urea water W is replenished.

  Again, in order to store the reducing agent tank 14 in the range T, a cushion 76 which combines positioning of the reducing agent tank 14 provided on the lower surface of the floor panel 2 by the hanger 43 and space formation between the floor panel 2 and the upper wall 64. And to the state of the first tank position B1 shown in FIG. Next, the tire 13 is placed on the tire carrier 12 and the carrier bars 24 and 25 are rotated upward. After the distal end of the carrier bar 25 is engaged with the distal end of the hook 28, the proximal end of the hook 28 is tightened toward the floor panel 2. Thus, the tire 13 is held in the state of being mounted on the lower surface of the floor panel 2, that is, in the state of the first tire position A1 shown in FIG.

  In this state, the upper surface of the upper wall 64 is formed lower than the upper end surface of the inner sidewall portion 35. The reducing agent tank 14 is blocked by the tire 13 and the floor panel 2 and can not be seen from the outside of the vehicle 1. In addition, at least a portion of the tire 13 overlaps the cross member 3, the rear end cross member 4, and the side members 5 and 6 provided on the lower surface of the floor panel 2 in the vehicle height direction. Being interrupted by the cross member 3, the rear end cross member 4 and the side members 5 and 6, the tire 13 is only partially visible from the outside of the vehicle 1.

  Furthermore, in the case where the hanger 43 that suspends the reducing agent tank 14 is operated from outside the vehicle and not inside the vehicle, when the tire 13 is attached to the tire carrier 12, the operation part of the hanger 43 is also hidden. Therefore, the lifting gear 43 can not be operated without lowering the tire carrier 12, and it is possible to prevent the operation in an incorrect procedure.

  Further, in this state, the inner sidewall portion 35 is in contact with the lower surface of the floor panel 2 and the outer sidewall portion 36 is in contact with the carrier bars 24 and 25 so as to be sandwiched. The vibration and impact in the vertical direction applied from the outside are absorbed by the elastic inner and outer side wall portions 35 and 36.

  In the reducing agent tank mounting structure 10 of the present embodiment configured as described above, as shown in FIG. 2, the circumferential surface and the lower surface of the reducing agent tank 14 and the inlet 73 are protected by the tire 13 The upper surface of the cross member 3, the rear end cross member 4 and the side members 5 and 6, which are the upper and lower members, is protected by the floor panel 2. Therefore, even if so-called chipping, in which a stalagmite splashed up by the front wheel flies toward the reducing agent tank 14 during traveling, is prevented by the tire 13, the droplets do not collide with the reducing agent tank 14. In addition, since the periphery of the reducing agent tank 14 is covered by the tire 13 and the floor panel 2, the reducing agent tank 14 is not directly affected by the heat generated by the exhaust system disposed on the lower surface of the floor panel 2. . Further, since the outer peripheral portion of the tire 13 surrounding the reducing agent tank 14 is configured by the rubber tire 32 having elasticity, even when an impact is applied by a rear collision of the vehicle 1 or the like, the rubber tire 32 reduces the impact.

  In this way, the reducing agent tank 14 is protected so as not to be damaged even by a slight impact or chipping. Therefore, it can be prevented that the internal combustion engine can not be restarted due to the damage to the reducing agent tank 14.

  Next, the reducing agent tank mounting structure 10 according to the second and third embodiments will be described. The components having the same or similar functions as the components of the first embodiment are denoted by the same reference numerals and the description of the corresponding first embodiment is referred to, and the description thereof is omitted here. The configuration other than that described below is the same as that of the first embodiment.

Second Embodiment
The reducing agent tank mounting structure 10 of the second embodiment of the present invention will be described with reference to FIG. The reducing agent tank mounting structure 10 according to the second embodiment is different from the first embodiment in that the reducing agent tank mounting structure 10 is integrally configured to be included in the reducing agent tank 14 as shown in FIG.

  In order to include the pump module 42 inside the reducing agent tank 14, the inlet 73 larger than the pump module 42 may be formed and the pump module 42 may be assembled, or another opening may be formed and assembled. In this embodiment, the reducing agent tank 14 including the pump module 42 is supported by the tray 53.

  If the internal combustion engine is not operated for a long time and crystals of urea are deposited inside the pump module 42, the pump module 42 may malfunction. In this embodiment, since the pump module 42 is always immersed in the urea water W inside the reducing agent tank 14, precipitation of crystals can be suppressed and malfunction of the pump module 42 can be prevented.

Third Embodiment
A reducing agent tank mounting structure 10 according to a third embodiment of the present invention will be described with reference to FIG. The reducing agent tank mounting structure 10 of the third embodiment is a first embodiment in that the tire 13 is held at a first tire position A1 by a suspended tire carrier 44 shown in FIG. 7 instead of the tire carrier 12. It is different from the form. The suspension type tire carrier 44 has substantially the same configuration as the suspension tool 43, and the tire 13 is suspended by a chain.

  As in the other embodiments, this embodiment is a first holding means that extends in the vertical direction of the vehicle and functions as a hanging type tire carrier 44 provided on the axial direction of the tire 13; and a hanging type tire carrier 44 And two independent holding means with a second holding means functioning as an adjacent hanger 43.

  The reducing agent tank mounting structure of the present invention is not limited to the above embodiment. Vehicles may coexist with reductant tanks of other constructions. In the case where the vehicle includes a chassis and a cabin instead of the floor panel, the hanger may be disposed at a position higher than the outline of the tire. The container of the reducing agent tank may be made of resin or metal. Although the container is suspended via the tray, the tray may be omitted and the container may be suspended directly on the hanger. Although the pump module is suspended together with the reducing agent tank, only the pump module may be disposed inside the vehicle.

  Reference Signs List 2 floor panel 10 reducing agent tank mounting structure 12 tire carrier (first holding means) 13 tire 14 reducing agent tank 31 wheel 42 pump module 43 suspension member 2 holding means), A1 ... first tire position, T ... range, W ... urea water (reducing agent)

Claims (3)

Floor panel,
A tire carrier provided on the lower surface of the floor panel;
A tire held on the lower surface of the floor panel by the tire carrier with the outer surface of the wheel facing downward;
A reducing agent tank which is arranged to be contained in the area enclosed by the floor panel and the tire and stores the reducing agent;
A reducing agent tank mounting structure, comprising: a hanger provided on the lower surface of the floor panel and suspending the reducing agent tank so as to be able to move up and down. The hanger extends from the lower surface of the floor panel toward the center of the reductant tank,
The reducing agent tank mounting structure according to claim 1, further comprising: a pump module disposed near the center of the reducing agent tank together with the hanger and delivering the reducing agent to the outside of the reducing agent tank. The reducing agent tank mounting structure according to claim 1 , further comprising: a pump module formed integrally with the reducing agent tank and delivering the reducing agent to the outside of the reducing agent tank.

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