JP2013203329A - Fixing structure of tank for vehicle - Google Patents

Abstract

A tank provided in a vehicle can be fixed with an appropriate tightening force.
A bracket 12 having a bottom plate portion 20a, a rear plate portion 20b, and left and right side plate portions 20c, 20c 'is attached to the outside of a vehicle frame 11, and a reducing agent tank 1 is placed on the bracket 12 to place a band 13 In the vehicle tank fixing structure, the band main body 28 is disposed on the groove-shaped upper bead 18 provided on the upper surface of the reducing agent tank 1, and the left and right side plate portions 20c and 20c ′ are fixed to the bracket 12. The hook portion 25 at one end of the J bolt 24 is hooked into the locking hole 26 formed at the same time, and the other end of the J bolt 24 is passed through the through holes 31 formed at the left and right end portions of the band body 28, A coil spring 32 is arranged on the protruding J bolt 24, and a nut is screwed into a male screw portion 30 provided at the other end of the J bolt 24 and tightened to pre-compress the coil spring 32. A reducing agent tank 1 is fixed to the bracket 12 while applying a.
[Selection] Figure 1

Description

  The present invention relates to a vehicle tank fixing structure in which a tank such as a reducing agent tank provided in a vehicle can be fixed with an appropriate tightening force.

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

  In order to fix the reducing agent tank to the vehicle frame, a dedicated bracket having a bottom plate portion, a rear plate portion, and left and right side plate portions is attached to the vehicle frame, and the reducing agent tank is placed on the bracket. Further, in order to prevent the reducing agent tank from moving forward and jumping upward, a band is disposed obliquely so as to pass through the front upper surface of the reducing agent tank and be fastened to the left and right side plate portions of the bracket. ing. The band includes a band main body disposed in a groove-shaped upper bead extending in the left-right width direction on the upper surface on the front side of the reducing agent tank, through holes provided in both left and right ends of the band main body, and the left and right side plate portions. J-bolts arranged between the locking holes provided on the left and right sides, hooking the bent portions of the J-bolts into the locking holes on the left and right side plates, and passing the male threaded portion of the J-bolts through the through-holes. Thus, the reducing agent tank is fixed to the bracket with a predetermined tightening force by screwing and tightening a nut to the male screw portion. There is also a type in which a rubber member (rubber) is attached to the band body so as to elastically fix the reducing agent tank.

JP 2011-131730 A

  By the way, the reducing agent tank is generally made of resin, and such a reducing agent tank made of resin is known to have a large coefficient of linear expansion. Expansion and contraction will occur. Accordingly, as described above, when the reducing agent tank is fixed at a predetermined strength by tightening a nut screwed into the male thread portion of the J bolt before use, the reducing agent tank expands due to a temperature change as described above. In some cases, the reducing agent tank is greatly deformed by the compression force of the band, and when the reducing agent tank contracts, the reducing agent tank is loosened between the band and the reducing agent tank is vibrated. There is a possibility that it may cause a problem when it is loose.

  Therefore, conventionally, in order to cope with such a problem, the thickness of the reducing agent tank has been increased to increase the rigidity of the reducing agent tank.

  However, when the thickness of the reducing agent tank itself is increased to increase the rigidity and strength, there is a problem that the weight of the reducing agent tank itself increases, and the production cost of the reducing agent tank also increases. .

  The present invention has been made in view of the above-described conventional problems, and it is an object of the present invention to provide a vehicle tank fixing structure that can fix a tank provided in a vehicle with an appropriate tightening force.

  According to the vehicle tank fixing structure of the present invention, a bracket having a bottom plate portion, a rear plate portion, and left and right side plate portions is attached to the outside of a vehicle frame, the tank is placed on the bracket, and the tank is bracketed by a band. A vehicle tank fixing structure, wherein a band main body is disposed on a groove-shaped upper bead extending in the left-right width direction on the front side of the upper surface of the tank, and formed on the left and right side plate portions. The hook of one end of the J bolt is hooked into the locking hole and the other end of the J bolt is passed through the through holes formed in the left and right ends of the band main body, and the other end of the J bolt protruding above the band main body is inserted. The tank is fixed to the bracket with a pre-compression force applied to the coil spring by arranging a coil spring and screwing and tightening a nut to the male thread at the other end of the J bolt. .

  Thus, the tank is fastened and fixed to the bracket in a state where a precompression force is applied by the coil spring. Therefore, even if the tank undergoes expansion / contraction deformation due to temperature changes due to climate or the like, the tank can be fixed with a substantially constant tightening force by the coil spring absorbing the deformation of the tank.

  In the vehicle tank fixing structure, the left and right side plates of the bracket and the through holes provided in both ends of the band main body are arranged in a straight line up and down, and the J bolt that hooks the hook into the locking hole is It is preferable to have a bent portion that is formed so as to face the locking hole after being bent sideways.

  In the vehicle tank fixing structure, a stepped portion is formed by providing a small-diameter male screw at the other end of the J-bolt, and a coil spring is disposed on the J-bolt protruding above the band body. It is preferable that a washer is disposed on the coil spring, and when the coil spring is compressed by tightening a nut screwed into the small-diameter male screw portion, the washer comes into contact with the step portion to define a tightening allowance of the coil spring.

  According to the vehicle tank fixing structure of the present invention, since the tank can be fastened and fixed to the bracket with a pre-compression force applied by a coil spring, even if the tank undergoes expansion / contraction deformation due to temperature changes due to climate, etc. The deformation of the tank is absorbed by the coil spring, so that the tank can be fixed with a substantially constant appropriate tightening force. Therefore, when the tank expands, the problem of the tank bending due to the compression force of the band, and the tank In the case of contraction, it is possible to obtain an excellent effect that it is possible to prevent the occurrence of the problem that the tightening force by the band is weak and the tank is loose.

  Further, since the stress acting on the tank can be reduced, there is an effect that a thin and lightweight tank can be used.

It is a side view which shows one Example of the fixing structure of the tank for vehicles of this invention. It is sectional drawing which looked at FIG. 1 from the II-II direction. It is a cutting | disconnection front view which shows the other structural example of the band which comprises this invention. It is a side view which shows the state which measures the deformation amount of a reducing agent tank. It is the graph which showed the deformation | transformation amount of the reducing agent tank corresponding to the reducing agent amount and temperature. It is a side view of the SCR system which equips the engine of a vehicle with a reducing agent tank.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 6 shows an SCR system 3 provided with a reducing agent tank 1 (urea water tank) in a vehicle engine 2 (for example, a diesel engine). The SCR system 3 of FIG. 6 includes a reducing agent injection nozzle 5 that injects urea water as a reducing agent into the exhaust pipe 4 in order from the exhaust upstream side, and an exhaust pipe 4 connected to the engine 2. An SCR catalyst 6 (selective reduction catalyst) that reduces and purifies NOx (nitrogen oxides) in the exhaust gas with ammonia generated from urea water injected into the exhaust gas is disposed. The urea water is stored in the reducing agent tank 1, supplied to the reducing agent supply pump 8 through the reducing agent supply pipe 7, and injected from the reducing agent injection nozzle 5. On the other hand, a part of the urea water supplied to the reducing agent supply pump 8 is returned to the reducing agent tank 1 through the reducing agent return pipe 9. The reducing agent supply pump 8 is controlled by the ECU 10 (engine control unit or electronic control unit), and the exhaust temperature at the inlet of the SCR catalyst 6 detected by an exhaust temperature sensor (not shown) becomes the activation temperature of the SCR catalyst 6. When it reaches, an amount of urea water corresponding to the amount of NOx in the exhaust gas is supplied to the reducing agent injection nozzle 5 and injected into the exhaust gas.

  1 and 2 show a fixing structure of the reducing agent tank 1 according to this embodiment. As shown in FIGS. 1 and 2, a bracket 12 is attached to a vehicle frame 11, the reducing agent tank 1 is placed on the bracket 12, and the reducing agent tank 1 is detachably fixed to the bracket 12 by a band 13. Yes.

  The reducing agent tank 1 is made of a resin tank having a high degree of freedom in molding, and the outer shape is formed in a substantially rectangular parallelepiped having a short side in the left-right width direction. The reducing agent tank 1 includes a front surface 1a directed to the outside of the vehicle, an upper surface 1b provided with a piping connection portion 16 to which the reducing agent supply port 14, the reducing agent return piping 15 and the like are connected, and left and right side surfaces 1c and 1c ′. And a rear surface 1d and a bottom surface 1e. In addition, a reducing agent supply port 17 is formed at the upper front side of the reducing agent tank 1 so that urea water can be easily supplied. A groove-shaped upper bead 18 extending in the left-right width direction is formed on the front upper surface 1 b of the reducing agent tank 1, and the left and right side surfaces 1 c, 1 c ′ of the reducing agent tank 1 are inclined from the upper bead 18. A groove-shaped side bead 19 extending rearward and rearward is formed.

  The vehicle frame 11 to which the bracket 12 is attached is composed of, for example, a side member of a ladder frame. In FIG. 1, the left side of the vehicle frame 11 is outside in the vehicle width direction.

  The bracket 12 includes a housing portion 20 that is formed by bending a steel plate and houses the reducing agent tank 1, and a mounting portion 21 that is integrally fixed to the housing portion 20 and attached to the vehicle frame 11. ing. And the accommodating part 20 of the bracket 12 includes a bottom plate part 20 a for placing the reducing agent tank 1, a rear plate part 20 b for supporting the rear surface 1 d of the reducing agent tank 1, and left and right sides of the reducing agent tank 1. And side plate portions 20c and 20c ′ for supporting the side surfaces 1c and 1c ′. The bottom plate portion 20a is formed in a substantially rectangular shape in plan view, and has a plurality of holes 22 for weight reduction. The side plate portions 20c and 20c ′ are formed to extend upward from both the left and right sides of the bottom plate portion 20a. The upper edges of the side plate portions 20c and 20c ′ have an inclined side 23 that is inclined downward from the upper end side of the rear plate portion 20b toward the front lower side, thereby exposing the substantially upper half of the reducing agent tank 1 from the bracket 12. .

  Further, when the reducing agent tank 1 is accommodated in the accommodating portion 20, a hook portion 25 at one end of the J bolt 24 constituting the band 13 is engaged with the side plate portions 20 c and 20 c ′ facing the lower end portion of the side bead 19. A locking hole 26 is formed to be stopped. The locking hole 26 has one triangular corner portion 26 ′ facing the band 13, and positions the hook portion 25 of the J bolt 24 at the corner portion 26 ′. The rear plate portion 20b is formed to extend from the rear end sides of the side plate portions 20c and 20c ′ to the inside of the accommodating portion 20. Further, a plurality of holes 22 for weight reduction are formed in the side plate portions 20c, 20c ′ and the rear plate portion 20b in the same manner as the bottom plate portion 20a.

  The attachment portion 21 is made of a steel material having a pair of L-shaped cross sections, and is provided along the corner portions of the side plate portions 20c, 20c ′ and the rear plate portion 20b. Further, a plurality of bolt holes (not shown) through which the mounting bolts 27 are inserted are formed in the mounting portion 21 and the rear plate portion 20b at intervals in the vertical direction, and the mounting portion 21 and the rear plate portion 20b are connected to each other. The bracket 12 is attached to the vehicle frame 11 by being fixed to the vehicle frame 11 with the mounting bolts 27.

  As shown in FIGS. 1 and 2, the band 13 has a band main body 28 that is formed in a plate shape extending in the left-right width direction and is accommodated in the upper bead 18. A locking piece 29 that is bent so as to project outward in the horizontal direction is formed in the portion, and the locking piece 29 has a through-hole through which the other end provided with the male screw portion 30 of the J bolt 24 passes. 31 is formed.

  The J bolt 24 has a hook portion 25 at one end hooked in a locking hole 26 provided in the side plate portions 20c and 20c ′ of the bracket 12 and the other end having a male screw portion 30 provided in a locking piece 29 of the band main body 28. It penetrates through the through hole 31. A coil spring 32 is disposed on the outer periphery of the J bolt 24 penetrating through the through hole 31, and a nut 33 is screwed and tightened to the male screw portion 30 provided at the other end of the J bolt 24. And the reducing agent tank 1 is fixed to the bracket 12. Reference numeral 36 in FIG. 2 is a washer.

  As shown in FIG. 2, the left and right side plate portions 20c, 20c ′ of the bracket 12 and the through holes 31 provided at both ends of the band main body 28 are arranged in a straight line up and down, and the hook portion 25 is The J bolt 24 hooked in the locking hole 26 has a bent portion 34 formed so as to face the through hole 31 after being bent sideways.

  FIG. 3 shows another example of the J bolt 24. A male threaded portion 30 'having a diameter smaller than that of the main body of the J bolt 24 is provided at the other end of the J bolt 24. A coil spring 32 is disposed on the other end of the J bolt 24 projecting upward from the band main body 28, and a washer 36 is disposed on the coil spring 32, and screwed into the small-diameter male thread 30 '. When the nut 33 is tightened and the coil spring 32 is compressed, the washer 36 comes into contact with the step portion 35 so that the tightening allowance of the coil spring 32 can be defined.

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

  As shown in FIG. 1, the bracket 12 is attached to the outside of the vehicle frame 11 by attachment bolts 27.

  In order to fix the reducing agent tank 1 to the bracket 12, as shown in FIGS. 1 and 2, the reducing agent tank 1 is placed inside the housing portion 20 of the bracket 12.

  Subsequently, a hook portion 25 provided at one end of the J bolt 24 constituting the band 13 is hooked in a locking hole 26 provided in the side plate portions 20c and 20c ′ of the bracket 12, and further, a band main body 28 constituting the band 13 is formed. The band body 28 is accommodated in the upper bead 18 formed on the upper surface of the reducing agent tank 1 by allowing the other end of the J bolt 24 to pass through the through holes 31 of the locking pieces 29 provided at both ends.

  Next, a coil spring 32 is fitted and disposed on the outer periphery of the other end of the J bolt 24 penetrating the through hole 31, and a washer 36 is further disposed, and a nut 33 is screwed into the male screw portion 30 at the other end of the J bolt 24. When tightened, the reducing agent tank 1 can be fixed to the bracket 12 with a pre-compression force applied to the coil spring 32.

  As described above, since the reducing agent tank 1 is fastened and fixed to the bracket 12 by the band 13 to which the pre-compression force is applied by the coil spring 32, the reducing agent tank 1 is deformed by expansion and contraction due to a temperature change due to climate or the like. Even if this occurs, the reductant tank 1 can always be fixed with a substantially constant appropriate tightening force by the coil spring 32 absorbing the deformation of the reductant tank 1. Therefore, the problem that the reducing agent tank 1 bends due to the tightening force of the band 13 when the reducing agent tank 1 expands can be reduced, and the tightening by the band 13 when the reducing agent tank 1 contracts. It is possible to prevent the occurrence of a problem that the power is weakened and the reducing agent tank 1 is rattled.

  Further, since the stress acting on the reducing agent tank 1 can be reduced, the thin and light reducing agent tank 1 can be used.

  The inventor conducted a test for measuring the amount of deformation of the reducing agent tank 1 when the amount of reducing agent to be accommodated and the temperature conditions were changed in the 19 liter type and 28 liter type reducing agent tanks 1.

  As shown in FIG. 4, the deformation amount of the reducing agent tank 1 is such that a line extending the front surface 1a and the upper surface 1b of the reducing agent tank 1 intersects and a line extending the rear surface 1d and the bottom surface 1e intersects. The length F in the diagonal direction connecting the two was measured.

  Then, as shown in FIG. 5, with respect to the reducing agent tanks 1 of 19 liter type and 28 liter type, when the reducing agent is at a specified amount of full tank at 23 ° C. and when the reducing agent is at a specified amount of full tank, The length F in the diagonal direction when the reducing agent is 1/3 of the specified amount at −20 ° C., and when the reducing agent is zero (empty) at −20 ° C. Changes were measured and the results are shown in FIG. The vertical axis in FIG. 5 represents the negative magnitude of the reducing agent tank 1 contracted.

  As is apparent from FIG. 5, the reducing agent tank 1 is most reduced when the reducing agent is 1/3 of the prescribed amount and is −20 ° C. In this most reduced point, the reducing agent tank 1 of the 28 liter type is reduced. Compared with the case where the reducing agent is at a specified amount of full tank at 23 ° C., the size is reduced by about 4 millimeters. In the 19 liter type reducing agent tank 1, the reducing agent is at a specified amount of full tank at 23 ° C. It is reduced by about 2 millimeters. From this, it was found that the reducing agent tank 1 deforms greatly depending on the amount and temperature of the reducing agent.

  Further, the inventor of the present invention uses the case where the reducing agent tank 1 is fixed using a band having rubber (rubber) on the band body as in the conventional case, and the reducing agent tank 1 using the band 13 having the coil spring 32 of the present invention. A test was conducted to determine the deformation ratio of the reducing agent tank 1 and the deformation ratio of the rubber and the coil spring 32 when they were fixed with the same tightening force.

The results are shown in Tables 1 and 2.

  From Table 1, the deformation ratio of the reducing agent tank 1 with rubber was 0.90, whereas the deformation ratio of the reducing agent tank 1 with the coil spring 32 in the present invention was 0.42. According to the present invention, it has been found that the amount of deformation of the reducing agent tank 1 can be reduced by 44% compared to the case where rubber is used.

  Here, as shown in FIG. 5, the reducing agent tank 1 is greatly deformed in accordance with the amount of reducing agent and the temperature. Therefore, when rubber having a small deformation ratio is used as shown in Table 1, the reducing agent tank 1 is reduced. Since the reducing agent tank 1 needs to be tightened and fixed in anticipation of the deformation amount of the reducing agent tank 1, there is a problem that the amount of deflection of the reducing agent tank 1 is increased due to the increase of the prior tightening force. For this reason, it is necessary to increase the thickness of the reducing agent tank 1 to increase the rigidity. Therefore, there is a problem that the weight of the reducing agent tank 1 increases and the production cost of the reducing agent tank 1 increases.

  On the other hand, in the present invention, since the band 13 is provided with the coil spring 32, the surface pressure at which the reducing agent tank 1 is tightened by the band 13 is lowered, and the bending deformation of the reducing agent tank 1 is reduced. There is an advantage that plastic deformation is difficult.

  Further, since the band 13 follows the expansion / contraction of the reducing agent tank 1 by the coil spring 32, a gap is prevented from being generated between the band 13 and the reducing agent tank 1, and the reducing agent tank 1 is rattled. Such a problem can be prevented in advance.

  Further, as shown in FIG. 2, the left and right side plate portions 20c, 20c ′ of the bracket 12 and the through holes 31 provided at both ends of the band body 28 are arranged in a straight line up and down, and the hook portion 25 Since the J bolt 24 hooked in the locking hole 26 of the side plate portions 20c, 20c ′ is bent sideways, the bent portion 34 is formed so as to face the through hole 31, so that the side plate portion 20c, 20c 'and the band main body 28 are vertically attracted by the J bolt 24, and the reducing agent tank 1 is fastened and fixed to the bracket 12 by the band 13 with a stable force.

  Further, as shown in FIG. 3, since the male screw portion 30 ′ having a diameter smaller than that of the J bolt 24 main body is provided at the other end of the J bolt 24 to form the stepped portion 35, it protrudes above the band main body 28. A coil spring 32 is disposed on the J bolt 24 and a washer 36 is disposed on the coil spring 32. When the nut 33 screwed into the small-diameter male screw portion 30 'is tightened to compress the coil spring 32, the washer 36 is The contact amount of the coil spring 32 can be defined by contacting the step portion 35. Therefore, the tightening of the reducing agent tank 1 by the band 13 can be easily fixed so that a constant tightening force is always maintained.

  The vehicle tank fixing structure of the present invention is not limited to the above-described embodiment, and can be applied to fixing various other tanks provided in the vehicle other than the reducing agent tank. Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Reductant tank 1b Upper surface 11 Vehicle frame 12 Bracket 13 Band 18 Upper bead 20 Housing part 20a Bottom plate part 20b Rear plate part 20c, 20c 'Side plate part 24 J bolt 25 Hook part 26 Locking hole 28 Band main body 30 Male thread part 30' Small threaded male thread part 31 Through hole 32 Coil spring 33 Nut 34 Bent part 35 Step part 36 Washer

Claims (3)

  A vehicle tank is fixed to the outside of the vehicle frame by attaching a bracket having a bottom plate portion, a rear plate portion, and left and right side plate portions, and placing the tank on the bracket and fixing the tank to the bracket with a band. A band body is disposed in a groove-like upper bead extending in the left-right width direction on the front side of the tank upper surface, and a hook portion at one end of a J bolt is inserted into a locking hole formed in the left and right side plate portions. The other end of the J bolt is passed through through holes formed in the left and right ends of the band body, and a coil spring is disposed on the other end of the J bolt protruding above the band body. A tank fixing structure for a vehicle, wherein a tank is fixed to a bracket in a state in which a precompression force is applied to a coil spring by screwing and tightening a nut to a male screw portion.   Through holes provided on the left and right side plate portions of the bracket and both ends of the band main body are arranged in a straight line up and down, and the J bolt that hooks the hook portion into the locking hole is bent sideways before the engagement. The vehicle tank fixing structure according to claim 1, further comprising a bent portion formed so as to face the blind hole.   A step portion is formed by providing a small-diameter male screw portion at the other end of the J bolt, a coil spring is disposed on the J bolt protruding above the band main body, and a washer is disposed on the coil spring. 3. The vehicular use according to claim 1, wherein when the nut screwed into the male screw portion having a diameter is tightened to compress the coil spring, the washer is abutted against the step portion to define a tightening allowance of the coil spring. Tank fixing structure.

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