WO2011078238A1

WO2011078238A1 - Reducing agent tank fixing structure

Info

Publication number: WO2011078238A1
Application number: PCT/JP2010/073167
Authority: WO
Inventors: 和宏小平; 章浩戸塚
Original assignee: いすゞ自動車株式会社; 日野自動車株式会社
Priority date: 2009-12-24
Filing date: 2010-12-22
Publication date: 2011-06-30
Also published as: CN102596619B; JP2011131730A; CN102596619A; JP5372727B2

Abstract

Provided is a reducing agent tank fixing structure such that even a small reducing tank agent can be fixed to a bracket, and that the reducing agent tank can be easily mounted on and removed from the bracket. A laterally extending groove-like upper bead (20) is formed on an upper surface (18) at the front of the reducing agent tank (11). Furthermore, groove-like side beads (21) which extend obliquely rearward from the upper bead (20) are formed on both side surfaces (19) of the reducing agent tank (11). The bracket (13), which comprises a bottom plate section (24) and back plate sections (25), are provided to a vehicle frame (12), said bottom plate section (24) serving to place the reducing agent tank (11), and said back plate sections (25) serving to support the backside of the reducing agent tank (11). The reducing agent tank (11) is placed on the bracket (13) in such a way that the front side of the reducing agent tank (11) faces the outside of the vehicle. A band (14) is applied to the reducing agent tank (11) in such a way that an intermediate section of the band (14) is placed in the upper bead (20) and the side beads (21), and that both ends of the band (14) are anchored to the bracket (13) with a tensile force provided.

Description

Reducing agent tank fixing structure

The present invention relates to a reducing agent tank fixing structure for detachably fixing a reducing agent tank to a vehicle frame.

SCR system purifies NOx (nitrogen oxide) in engine exhaust gas using urea (urea water) as a reducing agent. The urea water is stored in a reducing agent tank and appropriately supplied into the exhaust pipe of the engine (see Patent Document 1).

As shown in FIGS. 11A and 11B, the reducing

agent tanks

50 and 51 are mounted on a dedicated bracket 52 attached to a vehicle frame (not shown), and the two

bands

53 and 54 are attached. Used to fix to the bracket 52.

Japanese Patent No. 3687918

By the way, as a method for fixing the reducing agent tank, it is common to use two bands as described above. However, when the reducing agent tank is small, there is a problem that it is difficult to secure a space for a portion where the band is hung.

Also, it was necessary to make the structure fixed so that the tank could be easily assembled and removed at the factory.

Accordingly, an object of the present invention is to solve the above-described problems and provide a reducing agent tank fixing structure that can be fixed to a bracket even with a small reducing agent tank and that can be easily detached from the bracket.

In order to solve the above problems, the present invention is directed to a reducing agent tank fixing structure in which a reducing agent tank is detachably fixed to a vehicle frame, and extends laterally to an upper surface on the front side of the reducing agent tank with the vehicle outside as a front side. A bottom plate for forming a groove-shaped upper bead and a groove-shaped side bead extending obliquely rearward from the upper bead on both sides of the reducing agent tank, and for mounting the reducing agent tank on the vehicle frame And a bracket having a back plate portion for supporting the back surface of the reducing agent tank. The reducing agent tank is placed on the bracket with the front side facing the outside of the vehicle, and the band of the reducing agent tank is placed on the reducing agent tank. The intermediate portion is hung in the upper bead and the side bead, and both ends of the band are locked to the bracket while applying tension to the band.

The bracket may be formed with a pair of opposing side plate portions for supporting the side surfaces of the reducing agent tank, and both end portions of the band may be locked to the side plate portions.

A locking hole for locking both ends of the band is formed in the bracket, and the band is formed in a plate shape extending in a lateral direction and is accommodated in the upper bead, and the locking A J-bolt having a hook portion locked in the hole and a male screw portion fastened to the end portion of the band main body may be provided.

The band main body is formed by forming a metal plate extending laterally along the shape of the upper bead of the reducing agent tank, and the band main body includes a rubber interposed between the band main body and the reducing agent tank. A part may be provided.

The locking hole is formed to have a triangular shape and a corner portion directed in the extending direction of the band extending along the side bead of the reducing agent tank on the bracket, and the hook portion of the band at the corner portion. May be positioned.

Insertion holes for inserting the J bolts are formed at both ends of the band main body, and hooks for regulating the insertion depth into the insertion holes are preferably formed on the J bolts. .

According to the present invention, even a small reducing agent tank can be fixed to the bracket and can be easily detached from the bracket.

FIG. 1 is a perspective view of a reducing agent tank fixing structure according to an embodiment of the present invention. FIG. 2 is a side view of FIG. FIG. 3 is a plan view of FIG. 4 is a rear view of FIG. FIG. 5 is an enlarged perspective view of a main part of the band. FIG. 6A is an enlarged plan view of the main part of the band, and FIG. 6B is an enlarged front view of the main part of the band. FIG. 7 is a front view of the band main body. FIG. 8 is a fragmentary cross-sectional view of the band disassembled. 9A is a plan view of the J bolt, and FIG. 9B is a view taken along the line AA in FIG. 9A. FIG. 10 is a schematic diagram of an SCR system. FIG. 11A is an explanatory view showing a conventional reducing agent tank fixing structure, and FIG. 11B is an explanatory view showing another conventional reducing agent tank fixing structure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 10 shows an SCR system 1 in which a reducing agent tank (urea water tank) 11 according to this embodiment is used. The SCR system 1 is applied to an engine 2 mounted on a vehicle.

As shown in FIG. 10, a reducing agent injection nozzle 4 that injects urea water as a reducing agent into the exhaust pipe 3 in order from the upstream side of the exhaust to the exhaust pipe 3 connected to the engine (for example, diesel engine) 2. And an SCR catalyst (selective reduction catalyst) 5 for reducing and purifying NOx (nitrogen oxide) in the exhaust gas with ammonia generated from urea water injected into the exhaust pipe 3. The urea water is stored in the reducing agent tank 11 and is supplied to the reducing agent supply pump 7 through the reducing agent supply pipe 6. On the other hand, part of the urea water supplied to the reducing agent supply pump 7 is returned to the reducing agent tank 11 via the reducing agent return pipe 9. The reducing agent supply pump 7 is controlled by an ECU (engine control unit or electronic control unit) 8, and the exhaust temperature at the inlet of the SCR catalyst 5 detected by an exhaust temperature sensor (not shown) is the activation temperature of the SCR catalyst 5. Is reached, an amount of urea water corresponding to the amount of NOx in the exhaust gas is supplied to the reducing agent injection nozzle 4.

FIG. 1 shows a fixing structure of the reducing agent tank 11 according to this embodiment.

As shown in FIG. 1, the reducing agent tank 11 is detachably fixed to the vehicle frame 12 via a bracket 13 and a band 14.

The reducing agent tank 11 is made of a resin tank having a high degree of molding freedom, and the outer shape is formed in a substantially rectangular parallelepiped. The reducing agent tank 11 includes a front surface 16 directed to the outside of the vehicle, an upper surface 18 provided with a piping connection portion 17 to which piping such as the reducing agent supply piping 6 and the reducing agent return piping 9 are connected, and left and right side surfaces 19. , Having a back surface (not shown) and a bottom surface (not shown). In addition, a reducing agent supply port 15 is formed on the front side of the reducing agent tank 11 so that urea water can be easily supplied to the reducing agent tank 11. A groove-like upper bead 20 is formed on the upper surface 18 on the front side of the reducing agent tank 11 so as to extend in the left-right direction (side) and traverse. A groove-like side bead 21 extending obliquely rearward from the bead 20 is formed.

The vehicle frame 12 is made of, for example, a side member of a ladder frame. In FIG. 1, the left side of the vehicle frame 12 is the outside in the vehicle width direction.

The bracket 13 includes a housing portion 22 that is formed by bending a steel plate and houses the reducing agent tank 11, and a mounting portion 23 that is provided integrally with the housing portion 22 and attached to the vehicle frame 12.

As shown in FIGS. 1, 2, and 3, the accommodating portion 22 includes a bottom plate portion 24 for placing the reducing agent tank 11, a back plate portion 25 for supporting the back surface of the reducing agent tank 11, And a side plate portion 26 for supporting the left and right side surfaces 19 of the reducing agent tank 11. The bottom plate portion 24 is formed in a substantially rectangular plate shape in plan view, and has a plurality of holes 27 for weight reduction. The side plate portion 26 is formed to extend upward from both the left and right sides of the bottom plate portion 24. The upper edge 28 of the side plate portion 26 is inclined so that the front side is lowered, and the front side of the reducing agent tank 11 is exposed in a wide area. Further, a locking hole 29 for locking the band 14 is formed in the side plate portion 26 facing the lower end portion of the side bead 21 when the reducing agent tank 11 is stored in the storage portion 22. The locking hole 29 is formed through the side plate portion 26 so that a hook portion 30 of the band 14 to be described later can be hooked. Further, the locking hole 29 is formed in a triangular shape and is formed so that the corner portion 46 faces in the extending direction of the band 14, and the hook portion 30 is positioned by the corner portion 46. The back plate portion 25 is formed to extend from the rear end side of each side plate portion 26 to the inside of the accommodating portion 22. In addition, the side plate portion 26 and the back plate portion 25 are formed with a plurality of holes 27 for weight reduction, similar to the bottom plate portion 24.

As shown in FIGS. 2, 3, and 4, the attachment portion 23 is made of a steel material having a pair of L-shaped cross sections, and is provided along the corner portion 31 of the side plate portion 26 and the back plate portion 25. Further, a plurality of bolt holes 32 through which mounting bolts (not shown) are inserted are formed in the mounting portion 23 and the back plate portion 25 at intervals in the vertical direction, and the bracket 13 is attached to the vehicle frame 12 via the mounting bolts. It is designed to be attached.

As shown in FIGS. 1 and 2, the band 14 is formed in a plate shape extending in the left-right direction and is accommodated in the upper bead 20, and the band body 33 provided in the band body 33 and the reducing agent tank 11. And a J bolt 35 which is accommodated in the side bead 21 and locked in the locking hole 29 of the side plate 26 and fastened to the end of the band main body 33.

As shown in FIGS. 5, 6 and 7, the band main body 33 is formed by press-molding a metal plate extending in the left-right direction. The band main body 33 is bent so as to bend the central portion 36 in the left-right direction upward, and follows the shape of the upper bead 20 of the reducing agent tank 11. The band main body 33 has ribs 37 extending upward from both front and rear sides, and is formed with sufficient strength. Insertion holes 38 for inserting the J bolts 35 are formed in the left and right ends of the band main body 33.

As shown in FIGS. 6 and 8, the rubber portion 34 is for preventing the band main body 33 from directly touching and damaging the reducing agent tank 11, and is formed in a groove shape so that the upper bead 20, the band main body 33, An interposition part 39 interposed therebetween, and a locking part 40 which is formed to extend inward from the front and rear ends of the interposition part 39 and which is formed in a key shape and locked to the rib 37 of the band main body 33. .

As shown in FIG. 9, the J bolt 35 is formed at one end and hooked to the locking hole 29 of the side plate portion 26, and is formed at the other end and fastened to the end of the band main body 33. Insertion depth of the band main body 33 into the insertion hole 38 formed in the male screw portion 41, the intermediate portion 47 formed between the hook portion 30 and the male screw portion 41 and extending linearly, and the intermediate portion 47 adjacent to the male screw portion 41 And a collar part 42 for regulating the above. The hook portion 30 is configured to expose the distal end portion 43 to the outside of the bracket 13 when being hooked in the locking hole 29 of the side plate portion 26. Moreover, the front-end | tip part 43 of the hook part 30 has the notch part 44 which notches the side surface of the side which protrudes on the outer side of the bracket 13, and the hook part 30 and the other apparatus adjacent to the hook part 30 do not interfere. It has become. The male screw portion 41 is inserted through the insertion hole 38 of the band main body 33. As shown in FIG. 1, a nut 45 is screwed into the male screw portion 41, and tension is applied to the band 14 by tightening the nut 45.

Next, the operation of this embodiment will be described.

When removing the reducing agent tank 11 from the bracket 13, the nut 45 screwed into the J bolt 35 is loosened, and the band 14 is removed from the bracket 13. Thereby, fixation of the reducing agent tank 11 is released, and the reducing agent tank 11 can be removed from the bracket 13. Since the J bolt 35 is inclined so that the tip of the male screw portion 41 faces the outside of the vehicle, the nut 45 can be easily loosened.

When the reducing agent tank 11 thus removed from the bracket 13 is attached to the bracket 13 again, the reducing agent tank 11 is placed on the bracket 13, the band body 33 is placed in the upper bead 20, and the J bolt 35 is placed on the side. The hook is placed in the retaining hole 29 of the bracket 13 and the nut 45 is tightened. The reducing agent tank 11 is pressed against the bottom plate portion 24 and the back plate portion 25 of the bracket 13 and is firmly and easily fixed to the bracket 13. At this time, there is only one band 14, and positioning of the band 14 can be easily and accurately performed by the upper bead 20 and the side bead 21, so that the reducing agent tank 11 is fixed efficiently and firmly. it can. Further, since the insertion depth of the J bolt 35 of the band 14 into the insertion hole 38 is regulated by the flange portion 42, the hook portion 30 moves to the position of the insertion hole 28 and the positions of the male screw portion 41 and the hook portion 30. The hook portion 30 can be easily hung on the locking hole 29 of the bracket 13 when the reducing agent tank 11 is attached to the bracket 13.

Thus, the groove-shaped upper bead 20 extending in the left-right direction and traversing is formed on the upper surface 18 on the front side of the reducing agent tank 11, and continuous from the upper bead 20 obliquely rearward to the left and right side surfaces 19 of the reducing agent tank 11. Thus, a groove-shaped side bead 21 is formed, and the vehicle frame 12 has a bottom plate portion 24 for mounting the reducing agent tank 11 and a back plate portion 25 for supporting the back surface of the reducing agent tank 11. The reducing agent tank 11 is placed on the bracket 13 with the front side facing the outside of the vehicle, and the intermediate portion of the band 14 is hung on the reducing agent tank 11 in the upper bead 20 and the side bead 21. Since both ends of the band 14 are locked to the bracket 13 while applying tension to the band 14, even a small reducing agent tank 11 can be fixed to the bracket 13. Further, the reducing agent tank 11 can be easily detached from the bracket 13.

A pair of side plate portions 26 for supporting the left and right side surfaces 19 of the reducing agent tank 11 are formed on the bracket 13 so as to face each other, and both ends of the band 14 are locked to the side plate portions 26. Can be locked at positions close to the upper surface 18 of the reducing agent tank 11, and the reducing agent tank 11 can be easily fixed by the short band 14.

The bracket 13 is formed with a locking hole 29 for locking both ends of the band 14, and the band 14 is formed in a plate shape extending in the left-right direction and is accommodated in the upper bead 20. And the J bolt 35 having the male screw portion 41 fastened to the end of the band main body 33 and having the hook portion 30 to be locked in the locking hole 29, the reducing agent tank 11 is attached to the bracket 13. The two bands 14 can be firmly and easily fixed.

The band body 33 is formed by forming a metal plate extending in the left-right direction so as to follow the shape of the upper bead 20 of the reducing agent tank 11. The band body 33 is interposed between the band body 33 and the reducing agent tank 11. Since the rubber portion 34 is provided, the band main body 33 can be made strong according to the J bolt 35, and the reducing agent tank 11 can be prevented from coming into contact with the band main body 33 and being damaged. And the band main body 33 can be fitted to the upper bead 20, and the reducing agent tank 11 can be supported in a wide area.

The locking hole 29 is formed in a triangular shape and is formed so that the corner portion 31 faces the extending direction of the band 14 extending along the side bead 21 of the reducing agent tank 11 on the bracket 13. Since the 14 hook portions 30 are positioned, the hook portions 30 can be easily positioned with a simple structure.

Insertion holes 38 through which the J bolts 35 are inserted are formed at the left and right ends of the band main body 33, and flanges 42 are formed in the J bolts 35 to regulate the insertion depth into the insertion holes 38. Therefore, when the band 14 is removed from the bracket 13, it can be prevented that the position of the male screw portion 41 and the position of the hook portion 30 with respect to the band main body 33 are interchanged and become difficult to handle.

Although the locking hole 29 is formed to penetrate the side plate portion 26, it does not necessarily have to penetrate if the J bolt 35 is hung.

Further, although the reducing agent is made of urea water, it may be made of another liquid.

The reducing agent tank 11 is not limited to a resin tank, and may be a metal tank.

The locking hole 29 is formed in a triangular shape, but may be a polygonal shape such as a rectangle or a fan shape as long as the corner portion 46 is directed in the extending direction of the band 14, or other shapes. May be.

11 Reductant tank 12 Vehicle frame 13 Bracket 14 Band 15 Reductant supply port 18 Upper surface 19 Side surface 20 Upper bead 21 Side bead 24 Bottom plate portion 25 Back plate portion 26 Side plate portion 29 Locking hole 30 Hook portion 33 Band body 35 J bolt 41 Male thread

Claims

In a reducing agent tank fixing structure for detachably fixing a reducing agent tank to a vehicle frame, a groove-shaped upper bead extending laterally is formed on the front upper surface of the reducing agent tank with the vehicle outside as a front side, and the reducing agent Groove-shaped side beads extending diagonally rearward from the upper bead are formed on both sides of the tank, and the vehicle frame has a bottom plate portion for mounting the reducing agent tank and supports the back surface of the reducing agent tank. A bracket having a back plate portion is provided, and the reducing agent tank is placed on the bracket with the front side facing the outside of the vehicle, and the middle portion of the band is placed on the reducing agent tank with the upper bead and the side bead. A reducing agent tank fixing structure characterized in that both ends of the band are engaged with the bracket while applying tension to the band.
The fixing of the reducing agent tank according to claim 1, wherein a pair of side plate portions for supporting the side surface of the reducing agent tank is formed on the bracket so as to face each other, and both end portions of the band are locked to the side plate portion. Construction.
A locking hole for locking both ends of the band is formed in the bracket, and the band is formed in a plate shape extending in a lateral direction and is accommodated in the upper bead, and the locking The reducing agent tank fixing structure according to claim 1, further comprising a J-bolt having a hook portion locked in the hole and having a male screw portion fastened to an end portion of the band main body.
The band main body is formed by forming a metal plate extending laterally along the shape of the upper bead of the reducing agent tank, and the band main body includes a rubber interposed between the band main body and the reducing agent tank. The reducing agent tank fixing structure according to claim 3, wherein a portion is provided.
The locking hole is formed to have a triangular shape and a corner portion directed in the extending direction of the band extending along the side bead of the reducing agent tank on the bracket, and the hook portion of the band at the corner portion. 4. The reducing agent tank fixing structure according to claim 3, wherein the reducing agent tank is positioned.
An insertion hole for inserting the J bolt is formed at both ends of the band body, and a flange for restricting the insertion depth into the insertion hole is formed on the J bolt. 3. A fixing structure of the reducing agent tank according to 3.