JP5769047B2 - Urea water tank mounting structure - Google Patents

Description

  The present invention relates to a tank for storing urea water to be added as a reducing agent to a selective reduction catalyst for reducing and purifying NOx mounted on a vehicle.

Use of an SCR (Selective Catalytic Reduction) catalyst using urea to purify nitrogen oxide (NOx) in exhaust gas has been put into practical use as an exhaust gas treatment device for engines. An exhaust gas treatment apparatus using an SCR catalyst is an SCR having a property of selectively reacting nitrogen oxide (NOx) in exhaust gas with a reducing agent in the middle of an exhaust pipe through which exhaust gas flows, even in the presence of oxygen. And the urea water is injected into the exhaust passage upstream of the exhaust system of the SCR catalyst, NOx in the exhaust gas is selectively adsorbed on the SCR catalyst, and urea in the urea water is hydrolyzed to be a reducing agent. It is an apparatus for reducing the NOx emission concentration by supplying ammonia (NH ₃ ) to the SCR catalyst, reducing NOx adsorbed on the SCR catalyst, decomposing it into nitrogen and water and discharging it.

  In a vehicle using such an exhaust gas processing apparatus using an SCR catalyst, it is necessary to mount a urea water tank for storing urea water to be injected into the exhaust passage upstream of the SCR catalyst.

  FIG. 5 is a conventional view in which a urea water tank 10 for storing urea water is attached to the vehicle body.

  By the way, a vehicle equipped with an exhaust gas treatment device using an SCR catalyst uses the urea water tank 10 and an oxidation catalyst, and therefore the entire system itself causes a weight increase. In particular, since the mounting structure of the urea water tank 10 is heavy, it affects the running performance of the vehicle, the fuel consumption, and the layout of the vehicle. Therefore, weight reduction and space saving are important. As shown in FIG. 5, the conventional urea water tank 10 is provided with an outrigger 40 projecting laterally from the side rail 30 of the main body frame 20. A front outrigger 50 and a rear outrigger 60 that are arranged in the frame front-rear direction (vehicle front-rear direction) are provided back and forth. A plurality of support members 70 are bridged between the front and rear bottoms of the front and rear outriggers 50 and 60. The urea water tank 10 is mounted on the support member 70 by a mounting member 80. The mounting member 80 is fixed on the support member 70 along the outer peripheral shape of the lower part of the urea water tank 10. And the support member 70 outer peripheral shape part is mounted so that the outer peripheral surface part of the bottom part of the urea water tank 10 may be positioned. A mounting structure is described in which the urea water tank 10 is fixed so as to be covered between the mounting member 80 and the front-side outrigger 50 by two belt-like straps 90. For example, it is disclosed in Patent Document 1.

JP 2009-203967 A

  However, in the urea water tank mounting structure disclosed in FIG. 5 and Patent Document 1, there are many components such as the support member 70, the mounting member 80, and the two straps 90 of the fixing member. The urea water tank 10 placed on 70 is heavy and needs to reinforce the vehicle body mounting portion.

  Further, in the urea water tank 10 shown in FIG. 5 and the urea water tank disclosed in Patent Document 1, a structure directly attached to the front outrigger 50 of the main body frame has a plurality of structures in order to stabilize the mounting member 80. It is necessary to dispose the support member 70, which increases the weight and cost.

  Accordingly, the present invention provides a urea water tank mounting structure that suppresses an increase in the weight of the urea water tank and the urea water tank mounting structure parts and prevents damage to the harness and the piping and enables appropriate handling in view of the problems of the prior art. The purpose is to do.

In order to solve this problem, the present invention provides a side rail passing in the front-rear direction of the vehicle, a first outrigger fixed to the side rail, a second outrigger disposed at an interval from the first outrigger, In the mounting structure of the urea water tank that is mounted on the vehicle and stores the urea water, the vehicle body having a frame member of a vehicle body having a support frame that connects the first outrigger and the second outrigger, the urea water tank is flat. A through hole formed so as to penetrate the substantially central part of the rectangular parallelepiped shape in the shortest height direction of the rectangular parallelepiped shape forming a flat shape, and one end side of the through hole is formed through the through hole. mounted in the first outriggers over the frame member, the other end pressing member for pressing the frame side the urea solution tank from the front surface side is provided rod And a member, said aqueous urea tank by said rod-like member, characterized in that it is fixed in the first outrigger cantilevered form for the chromatography of the vehicle body frame member.

With such a configuration, one end side is attached to the vehicle body side frame and the other end side is inserted into the through hole in the through hole formed so as to penetrate substantially the center of the flat rectangular water tank. Since the urea water tank is fixed to the rod-like member at the other end, the number of parts for mounting the urea water tank is reduced and the mounting structure is simplified, so the weight and cost of the mounting device can be reduced. It becomes.
In addition, since the center of the flat water tank is fixed, the center of gravity of the urea water tank is fixed, and the moment generated at the center of gravity and the fixed part is minimized with respect to vibrations caused by vehicle travel. The urea water tank can be stably fixed, the stress generated in the frame mounting portion of the rod-like member can be reduced, and the reinforcement of the portion can be simplified.
Further, since a fastening member such as a bolt for attaching the urea water tank to the frame does not come out, it is possible to prevent damage to the harness and piping routed in the vicinity of the frame, and it is possible to handle a suitable harness and actuator piping.

  Preferably, in the present invention, the two mounting holes and the two rod-shaped members are provided at an equal pitch centered on the center of gravity of the urea water tank when the urea water tank is full. It is good to have.

  By adopting such a configuration, the urea water tank has two mounting holes and two rod-like members provided with reference to the center of gravity when the urea water tank is full. The mounting balance is good and the mounting is stable.

  In the present invention, preferably, an elastic member is interposed between the pressing member provided on the other end side of the rod-shaped member and the urea water tank, and the pressing member is elastic member via the rod-shaped member. It is good to press the side wall.

  By adopting such a configuration, the pressing member has a structure for fixing the urea water tank via the elastic member, so that a mounting plane with a large area can be secured in the urea water tank, and the urea water tank by the pressing material can be secured. Damage (damage due to metal) and vibration transmitted from the rod-shaped member or urea water tank can be suitably absorbed by the elastic member.

  In the present invention, it is preferable that the rod-like member is attached to the frame member of the vehicle body via a bracket member having a closed cross-sectional shape attached to the frame member of the vehicle body.

  By adopting such a configuration, the bracket member on one end side attached to the vehicle body side of the rod-shaped member has a closed cross-sectional shape, so that it is possible to prevent a decrease in frame rigidity. Further, since a fastening member such as a bolt for attaching the urea water tank to the frame does not come out, it is possible to prevent damage to the harness and piping routed in the vicinity of the frame, and it is possible to handle suitable harness and actuator piping.

  As described above, according to the present invention, an increase in the weight of the urea water tank mounting structure part is suppressed, the frame rigidity is prevented from being lowered, damage to the harness and piping can be prevented and suitable handling can be performed, and vibration transmitted from the vehicle can be prevented. It can be set as the urea water tank attachment structure suppressed suitably.

The schematic explanatory drawing of the vehicle carrying the urea water tank in the embodiment of the present invention is shown. It is a perspective view of the urea water tank mounting part in the embodiment of the present invention. It is a urea water tank and urea water tank attachment structure perspective view in the embodiment of the present invention. It is an attachment structure detailed drawing of the urea water tank which shows the example of the present invention. It is a perspective view of the urea water tank and attachment part periphery of a prior art.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the following description, the front-rear direction and the left-right direction are defined based on the state of being seated in the driver's seat of the vehicle.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

1 and 2, the urea water tank 115 according to the first embodiment is mounted on the rear portion of the rear wheel shaft 130 of the large rear engine bus 120.
A chassis frame 150 on which the vehicle body 140 is mounted is disposed inside the vehicle body 140 of the large rear engine bus 120, and a urea water tank 115 is attached to the chassis frame 150.

  The chassis frame 150 shown in FIG. 2 has a space between the two side rails 160 having a space in the vehicle width direction and an open section of a “U” shape passing in the vehicle front-rear direction. The first cross member 170 to be fastened, the second cross member 171 in front of the vehicle from the first cross member 170, and the side rail 160 so as to be continuous with the first cross member 170 on both outer sides in the vehicle width direction of the first cross member 170. The first outrigger 200 fixed to the first outrigger 200, the second outrigger 210 disposed behind the first outrigger 200 at a distance, and the support frame 205 connecting the lower portions of the first outrigger 200 and the second outrigger 210. It consists of and.

  The engine room of the rear engine bus is disposed behind the second outrigger 210 and houses the engine and the drive device.

  The first outrigger 200 shown in FIG. 2 has two sides with a frame 182 having a rectangular frame at a position in line with the first cross member 170 on the outer side in the vehicle width direction of the first cross member 170. Each of the rails 160 and 160 extends outward and is welded to the web surface of the side rail 160 with the side rail 160 interposed therebetween. A reinforcement 183 is welded so as to cover the entire surface of the rectangular frame 182, and a joint portion with the web surface of the side rail 160 is also welded to the web surface to maintain rigidity.

In the second outrigger 210, a rectangular frame member 184 abuts on the web surface of the side rail 160 on both sides of a cross frame member 180 having a closed cross-sectional shape in which the upper surfaces of the two side rails 160 are bridged in the vehicle width direction. In this manner, each of them is arranged so as to extend downward, and each is welded to the web surface of the side rail 160.
In the frame of the rectangular frame member 184, a reinforcing member is disposed in a truss shape in order to maintain the rigidity of the frame.

The urea water tank 115 shown in FIG. 2 and FIG. 3 and the bracket 190 as a mounting structure part of the urea water tank 115 are the left side of the vehicle rear, the web surface of the side rail 160, the first outrigger 200, the first The two outriggers 210 are arranged in a region surrounded by a support frame 205 that connects lower portions of the first outrigger 200 and the second outrigger 210 and strengthens rigidity of the lower portion.
A vehicle body 140 formed in a bus outer shape is fastened to the outer portion 201 constituting the framework of the first outrigger 200 and the outer portion 211 constituting the framework of the second outrigger 210, and the mounting portion for the urea water tank 115 is mounted. Has a closed cross-sectional shape in plan view.

The urea water tank 115 shown in FIGS. 3 and 4 is a flat surface formed in a flat rectangular parallelepiped shape, and the urea water tank center of gravity position 280 when the urea water tank 115 is filled is used as a reference. Thus, two cylindrical through-holes 220 for mounting that penetrate the flat portion are provided on both sides of the center of gravity 280.
The urea water tank 115 is a container having a sealed container shape for storing urea water therein. A liquid meter 260 for monitoring the liquid amount is attached to the upper part of the tank, and an inlet 270 for supplying urea water is disposed obliquely upward in the vehicle outward direction.

  The bracket 190 for attaching the urea water tank 115 is a sheet metal plate having a basic cross section on a trapezoid, and mounting holes 330 are provided in the flanges 320 which are mounting seats on both ends of the lower side of the trapezoidal shape. A frame plate 340, a rectangular reinforcing plate 370, and a joining pipe 230, which is a cylindrical bar-shaped member. The frame plate 340 is fastened by inserting bolts 360 into female screws provided on the mounting plane of the mounting holes 330 and the mounting stays 250 (see FIG. 2) disposed in the first outrigger 200. A reinforcing plate 370 is welded between the upper side and the lower side of the trapezoidal cross-sectional shape that is the basic cross section of the frame plate 340, and the cylindrical joining pipe 230 penetrates the trapezoidal upper surface of the frame plate 340 for reinforcement. It is in contact with the plate 370. The reinforcing plate 370 and the joining pipe 230 are welded to the joining pipe 230 and the penetrating portion of the trapezoidal shape.

As shown in FIG. 4, the joining pipe 230 includes a cylindrical pipe 380 and a cylindrical boss 390 welded to the tip of the pipe 380 on the entire circumference. The tip shape is a convex shape in which the edge of the boss 390 protrudes from the tip edge of the pipe 380.
A female screw portion 430 into which the bolt 500 is screwed is disposed at the center of the mounting seat surface 410 of the boss 390.

According to the above configuration, the components of the bracket 190 that attaches the urea water tank 115 to the first outrigger 200 have a small number of parts, and the center of gravity 280 in a state where the urea water tank 115 is full is used as a reference. Since the fitting pipe 230 of the bracket 190 is fitted and attached, the outer fitting shape of the bracket 190 can be made compact, and the weight can be reduced and the cost can be reduced by reducing the number of parts.
Further, since the urea water tank 115 is structured to be attached to the first outrigger 200 via the bracket 190, only one support frame 205 connecting the lower portions of the first outrigger 200 and the second outrigger 210 is required. Reduction of parts cost and assembly man-hour can be achieved.

The two through holes 220 for attachment of the urea water tank 115 are provided at equal pitches around the center of gravity 280 when the urea water is full in the tank.
Therefore, since the mounting structure captures a well-balanced center of gravity, the excessive weight of the urea water tank 115 is not applied to the joint pipe 230 or its peripheral parts (for example, outriggers or mounting brackets) when the vehicle travels. The reinforcement around the mounting portion can be reduced.

As shown in FIGS. 3 and 4, the structure of the attachment portion of the urea water tank 115 is a rubber buffer 460 that is an elastic member made of cylindrical rubber, and a dish-shaped central portion that constitutes the pressing member is a concave shape with a circular seat. The plate includes a pressing plate 470 that has a circular hole in contact with the rubber buffer 460, a bolt 500 that is screwed to the tip of the joining pipe 230, and a bracket 190.
Then, the assembly procedure is as follows. The mounting through hole 220 of the urea water tank 115 is inserted into the joining pipe 230 of the bracket 190 attached to the first outrigger 200, and then the surface side 285 of the urea water tank 115 is attached. The rubber buffer 460 is inserted into the mounting seat surface 290 provided on the outer periphery of the through-hole 220 for use. The pressing seat surface 480 of the pressing plate 470 is brought into contact with the seating surface 490 that receives the surface pressure of the rubber buffer 460, and the bolt 500 is inserted into the female screw portion 430 disposed at the tip of the joining pipe 230 and fastened.

According to the above configuration, the vibration from the undercarriage shown in FIG. 1 is transmitted to the side rail 160, is transmitted from the side rail 160 to the bracket 190 via the first outrigger 200, and is pressed from the joint pipe 230 which is the tip thereof. It is absorbed by the rubber buffer 460 through the seat surface 490 that receives the surface pressure of 470.
For this reason, it is possible to secure a wide mounting plane in the urea water tank 115, effectively absorb vibration transmitted from the vehicle side, and generate stress around the mounting hole portion of the urea water tank 115. Can be reduced.

  Further, since the urea water tank 115 is structured to be attached to the first outrigger 200 via the bracket 190, only one support frame 205 connecting the lower portions of the first outrigger 200 and the second outrigger 210 is required. Reduction of parts cost and assembly man-hour can be achieved.

  As a urea water tank mounting structure that suppresses the increase in the weight of urea water tank mounting structure parts, prevents a decrease in frame rigidity, prevents damage to the harness and piping, and enables appropriate handling, and suitably suppresses vibration transmitted from the vehicle Can be used.

DESCRIPTION OF SYMBOLS 115 Urea water tank 120 Vehicle 190 Bracket 200 1st outrigger 210 2nd outrigger 220 Mounting through-hole 230 Joining pipe 285 Tank surface 290 Urea water tank mounting seat surface 310 Tank rear wall 330 Mounting hole 380 Pipe 460 Rubber buffer 470 Press plate 500 volts

Claims (4)

A side rail passing in the front-rear direction of the vehicle, a first outrigger fixed to the side rail, a second outrigger spaced from the first outrigger, the first outrigger, and the second outrigger, In the mounting structure of the urea water tank that is mounted on the vehicle and includes the frame member of the vehicle body having the support frame that connects the urea water and stores the urea water.
The urea water tank is formed in a flat rectangular parallelepiped shape, and has a through hole formed so as to pass through the substantially central portion of the rectangular parallelepiped shape in the shortest height direction of the rectangular parallelepiped shape forming the flat shape, and penetrates the through hole. and one end is attached to the first outriggers over of the vehicle body frame member, the other end is provided with a rod-shaped member pressing member for pressing the frame side the urea solution tank from the front surface side is provided, the aqueous urea tank There mounting structure of the bar by a member, the urea water tank, characterized in that it is fixed in the first outrigger cantilevered form for the chromatography of the vehicle body frame member.   The two mounting holes and the two rod-shaped members are provided around the center of gravity of the urea water tank when the urea water is full in the urea water tank. Urea water tank mounting structure.   An elastic member is interposed between the pressing member provided on the other end side of the rod-shaped member and the urea water tank, and the pressing member presses a side wall of the elastic member via the rod-shaped member. The urea water tank mounting structure according to claim 1, wherein:   3. The urea water tank mounting structure according to claim 1, wherein the rod-like member is attached to the frame member of the vehicle body via a bracket member having a closed cross-sectional shape attached to the frame member of the vehicle body.

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