JP2018165065A - Vehicle liquid supply structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly supply a liquid and improve the efficiency of a liquid supply work to a tank. When the inflow direction of the urea water W injected from the nozzle 5202 is changed in the curved pipe portion 32, the urea water W collides with the outer inner surface 46 of the curved pipe portion 32 to generate a vortex, and the urea water W becomes the urea water W. The air is mixed to generate bubbles, and the apparent volume of urea water W increases. However, since the bulging surface 48 that expands the cross-sectional area of the curved pipe portion 32 is formed, the liquid level of the urea water W is supplied in the upstream pipe portion 30 even if the apparent volume of the urea water W increases. The rate of ascent towards the mouth 22 can be reduced. [Selection diagram] Fig. 6

Description

  The present invention relates to a liquid supply structure for a vehicle.

In recent years, vehicles equipped with a urea water reduction SCR (Selective Catalytic Reduction) device using urea as an exhaust gas purification device for an internal combustion engine have been provided. Urea water is injected as a reducing agent in the inside to purify nitrogen oxides in the exhaust.
In this type of vehicle, a urea water tank that stores urea water, a liquid supply port that supplies urea water to the urea water tank, and a pipe that connects the liquid supply port and the urea water tank are provided.
From the viewpoint of smoothly performing the urea water supply operation by the supply gun, the liquid supply ports are arranged at the side and front and rear portions of the vehicle, while the urea water tank is provided at the lower part of the vehicle away from the liquid supply port. For this reason, a curved pipe portion that converts the inflow direction of the urea water supplied from the liquid supply gun to the liquid supply port toward the urea water tank side is provided in a pipe portion near the liquid supply port.
On the other hand, if a curved pipe is provided near the liquid supply port, when urea water is vigorously supplied from the liquid supply gun to the liquid supply port, the urea water collides with the wall surface of the curved pipe and creates a vortex. When air is mixed with urea water, bubbles are generated and the apparent volume of urea water increases.
For this reason, it becomes difficult for the urea water to smoothly flow into the urea water tank in the curved pipe portion, so the urea water flows backward from the curved pipe portion toward the liquid supply port during liquid supply, and the nozzle tip of the liquid supply gun When the liquid level reaches the sensor, it may be erroneously detected that the urea water tank is full.
In this case, since the supply of urea water from the nozzle of the liquid supply gun is stopped even though the urea water tank is not yet full, the liquid supply gun must be operated again. There is a problem that the efficiency of the supply work is reduced.
Such a problem occurs not only when the liquid is urea water (reducing agent) but also when the liquid is fuel or the like.
In addition, Patent Document 1 discloses a technique for smoothly flowing the liquid flowing through the pipe into the tank by forming a guide surface for forming a swirling flow in the liquid flowing through the pipe. If the liquid is mixed with air and the apparent volume increases, it cannot be dealt with.

JP 2010-137591 A

  The present invention has been made in view of the above circumstances, and it is advantageous in that the liquid of the vehicle is advantageous in smoothly supplying the liquid, improving the efficiency of supplying the liquid to the tank, and arranging the liquid piping. The object is to provide a supply structure.

In order to achieve the above object, an invention according to claim 1 is provided with a pipe for connecting a liquid supply port and a tank, and the pipe is a liquid supply structure for a vehicle having a curved pipe portion where the pipe is curved. And the bulging surface which expands the cross-sectional area of the said bending pipe part is formed in the outer side of the curvature radius direction of the said bending pipe part, It is characterized by the above-mentioned.
The invention according to claim 2 is characterized in that the bulging surface is formed so that the cross-sectional area is maximized at substantially the center in the extending direction of the bending tube portion.
According to a third aspect of the present invention, the bulging surface has an upstream bulging surface located closer to the liquid supply port than a center in the extending direction of the bending tube portion, and a center in the extending direction of the bending tube portion. A downstream bulging surface located on the side away from the liquid supply port, and the length of the downstream bulging surface along the extending direction of the curved tube portion is larger than the length of the upstream bulging surface. The upstream bulging surface is formed so as to rapidly increase the cross-sectional area of the bending tube portion as it approaches the center in the extending direction of the bending tube portion, and the downstream bulging surface is formed of the bending tube portion. It is formed so that the cross-sectional area of the said curved pipe part may reduce gradually as it leaves | separates from the center of the extending direction.
According to a fourth aspect of the present invention, the piping is disposed between a wheel house and a splash shield disposed outside the vehicle from the wheel house, and the curved pipe portion is arranged in the front-rear direction of the vehicle. It is arrange | positioned rather than the highest location of the wheel accommodated in a wheel house, and the said tank is arrange | positioned.

According to the first aspect of the present invention, since the bulging surface that enlarges the cross-sectional area of the curved tube portion is formed, even if liquid bubbles are generated during liquid supply and the apparent liquid volume increases, The rate at which the liquid level rises toward the liquid supply port can be reduced.
Further, since the bubbles in the bent tube portion disappear with time and are discharged to the outside from the liquid supply port, the liquid smoothly flows from the bent tube portion toward the tank.
Accordingly, it is possible to suppress the liquid level of the liquid staying in the curved pipe portion from rising and stopping the supply of the liquid even though the urea water tank is not full, and the efficiency of the supply work of the liquid to the tank This is advantageous for achieving the above.
According to the second aspect of the present invention, it is more advantageous to reduce bubbles generated by the liquid jetted to the liquid supply port colliding with the bulging surface, and to reduce the apparent volume of the liquid. This is advantageous in improving the efficiency of the supply work to the plant.
According to the third aspect of the present invention, it is advantageous in securing the degree of freedom of the layout of the piping in a limited space, and it is advantageous in arranging the liquid piping. In addition, it is more advantageous in increasing the efficiency of the operation of supplying the liquid to the tank.
According to the fourth aspect of the present invention, it is advantageous to protect the curved pipe portion and the pipe portion in the vicinity thereof with the wheel house and the splash shield, and it is advantageous to route the liquid pipe.

It is the side view which looked at the rear part of the vehicle of an embodiment from the left side. It is AA sectional view taken on the line of FIG. It is a perspective view of piping. It is a side view of a curved pipe part. (A) is the sectional view on the AA line of FIG. 4, (B) is the sectional view on the BB line of FIG. 4, (C) is the sectional view on the CC line of FIG. It is explanatory drawing which looked at the state from which a liquid is supplied to a liquid supply opening from a nozzle from upper direction. It is explanatory drawing which looked at the state from which a liquid is supplied to a liquid supply opening from a nozzle from the vehicle front.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a case will be described in which the vehicle includes an internal combustion engine and a urea water reducing SCR device, and the liquid is urea water.
In the drawing, the arrow FR indicates the front of the vehicle, the arrow LH indicates the vehicle width direction, and the arrow UP indicates the upper side of the vehicle. Further, the left and right sides of the vehicle are defined in a state of facing the front of the vehicle.

First, the structure of the rear part of the vehicle will be described.
As shown in FIGS. 1 and 2, a wheel house 14 that houses a rear wheel (wheel) 12 and a splash shield 16 are provided at the rear of the vehicle 10.
The wheel house 14 is made of a steel plate and has an arch shape.
The wheel house 14 is formed of a wheel house inner 14A on the inner side in the vehicle width direction and a wheel house outer 14B on the outer side in the vehicle width direction.
The splash shield 16 is made of synthetic resin and shields muddy water and the like that the rear wheel 12 jumps up.
The lower portion of the wheel house outer 14B is joined to the inner surface of the outer plate 18 of the vehicle 10, and the splash shield 16 is attached to the inner surface of the lower portion of the wheel house outer 14B at the outer end in the vehicle width direction. However, the inner part in the vehicle width direction is joined to the wheel house inner 14A.

Next, the vehicle liquid supply structure 20 will be described.
As shown in FIGS. 1 to 3, the vehicle liquid supply structure 20 includes a liquid supply port 22, a urea water tank 24, and a pipe 26 that connects the liquid supply port 22 and the urea water tank 24. Has been.
The liquid supply port 22 is a portion into which a nozzle of a liquid supply gun for supplying urea water is inserted. The liquid supply port 22 is disposed in a recess 18 </ b> A provided in the outer plate 18, and the recess 18 </ b> A is opened and closed by a lid 19.
The liquid supply port 22 is located above the rear wheel 12 as viewed from the vehicle width direction on the left side portion of the vehicle 10.
The liquid supply port 22 faces obliquely upward outward in the vehicle width direction, and the liquid supply port 22 is opened and closed by a cap 28.
The urea water tank 24 is disposed below the rear floor panel at the rear portion of the vehicle 10, and is disposed on the rear side and below the vehicle 10 with respect to the wheel house 14 in the present embodiment.

The pipe 26 includes an upstream pipe part 30, a curved pipe part 32, a first downstream pipe part 34, a second downstream pipe part 36, and a third downstream pipe part 38.
The upper end of the upstream pipe portion 30 is formed as a liquid supply port 22, and extends substantially linearly from the liquid supply port 22 in the vertical direction on the inner side in the vehicle width direction.
The curved pipe part 32 is a part where the pipe 26 is curved, in other words, a part where the inflow direction of the urea water flowing through the upstream pipe part 30 is changed toward the urea water tank 24 side, and in the vicinity of the liquid supply port 22. The one end is connected to the lower part of the upstream pipe part 30.

The curved pipe portion 32 is disposed in the space S between the wheel house 14 and the splash shield 16 behind the highest portion of the rear wheel 12 accommodated in the wheel house 14 when viewed from the vehicle width direction.
The first downstream pipe portion 34 is connected to the other end of the bending pipe portion 32 and extends below the vehicle and inward in the vehicle width direction below.
The second downstream pipe portion 36 is connected to the lower end (downstream end) of the first downstream pipe portion 34 and extends rearward of the vehicle below.
The third downstream pipe portion 38 is connected to the lower end (downstream end) of the second downstream pipe portion 36, extends rearward of the vehicle, and is connected to the urea water tank 24.
In FIG. 3, reference numeral 40 denotes a mounting bracket for attaching the upstream pipe portion 30 to the inner surface of the wheel house 14, and reference numeral 42 discharges air in the urea water tank 24 as the liquid level in the urea water tank 24 rises. Shows the breather pipe.

In the present embodiment, the liquid supply port 22 is disposed above the rear wheel 12 accommodated in the wheel house 14 when viewed from the vehicle width direction on the left side of the vehicle 10, and the upstream pipe portion 30; The curved tube portion 32, the first downstream tube portion 34, and the second downstream tube portion 36 are spaces S formed between the wheel house 14 and the splash shield 16 disposed on the vehicle outer side than the wheel house 14. The vehicle 10 is disposed behind the vertical line passing through the axle of the rear wheel 12.
As shown in FIG. 6, the extending direction of the upstream pipe part 30 and the extending direction of the first downstream pipe part 34 intersect with each other at an angle of approximately 90 ° via the curved pipe part 32 as viewed from above.
That is, by providing it behind the highest portion of the rear wheel 12 in the front-rear direction of the vehicle 10, in the limited space S between the wheel house 14 and the splash shield 16, which is a dead space, in the vicinity of the liquid supply port 22. It is possible to arrange the upstream pipe part 30, the curved pipe part 32, the first downstream pipe part 34, and the second downstream pipe part 36 except for.
Further, by arranging the upstream pipe portion 30 excluding the vicinity of the liquid supply port 22, the curved pipe portion 32, the first downstream pipe portion 34, and the second downstream pipe portion 36 in the space S, these pipe 26 portions The protection of is planned.

As shown in FIGS. 4, 5 </ b> A, 5 </ b> B, and 5 </ b> C, a bulging surface 48 that expands the cross-sectional area of the bending tube portion 32 is formed outside the bending tube portion 32 in the radius direction of curvature. .
More specifically, the inner surface of the bending tube portion 32 includes an inner inner surface 44 positioned on the inner side in the radius direction of curvature of the bending tube portion 32 and an outer inner surface 46 positioned on the outer side in the radius direction of curvature. .
The inner inner surface 44 is curved with a constant radius of curvature R.
A bulging surface 48 that expands the cross-sectional area of the bending tube portion 32 is formed on the outer inner surface 46. In the present embodiment, the entire area of the outer inner surface 46 is formed by the bulging surface 48. 4, 5 </ b> B, and 5 </ b> C, reference numeral 46 </ b> A indicates an outer inner surface that is curved with a constant radius of curvature larger than the radius of curvature R without the bulging surface 48.
The bulging surface 48 is formed so as to maximize the cross-sectional area of the bending tube portion 32 cut at a plane orthogonal to the extending direction of the bending tube portion 32 at approximately the center in the extending direction of the bending tube portion 32. . In other words, the bulging surface 48 is formed so that the cross-sectional area a of the bending tube portion 32 is approximately the center in the extending direction of the bending tube portion 32, and in this embodiment, the region 50 has the maximum cross-sectional area. It is a part that has.
More specifically, the bulging surface 48 has an upstream bulging surface 48 </ b> A located closer to the liquid supply port 22 than the center in the extending direction of the bending tube portion 32, and liquid supply from the center in the extending direction of the bending tube portion 32. A downstream bulging surface 48B located on the side away from the mouth 22;
The length L2 of the downstream bulging surface 48B along the extending direction of the inner surface of the bending tube portion 32 is formed with a dimension larger than the length L1 of the upstream bulging surface 48A.
The upstream bulging surface 48 </ b> A is formed so as to rapidly increase the cross-sectional area of the bending tube portion 32 as it approaches the center in the extending direction of the bending tube portion 32.
Further, the downstream bulging surface 48B is formed so as to gradually reduce the cross-sectional area of the bending tube portion 32 as the distance from the center in the extending direction of the bending tube portion 32 increases.

Next, the function and effect will be described.
As shown in FIGS. 6 and 7, when the tip of the nozzle 5202 of the liquid supply gun 52 is inserted into the upstream pipe portion 30 from the liquid supply port 22 and the trigger 5204 of the liquid supply gun 52 is pulled, the urea water W is Injected from the tip of 5202.
When the inflow direction of the urea water W injected from the nozzle 5202 is changed in the curved tube portion 32, a vortex is generated by colliding with the outer inner surface 46 of the curved tube portion 32, and air is mixed with the urea water W. As a result, bubbles are generated and the apparent volume of the urea water W increases.
However, since the bulging surface 48 that enlarges the cross-sectional area of the curved pipe portion 32 is formed on the outer inner surface 46, the liquid level of the urea water W remains upstream even if the apparent volume of the urea water W increases. The speed of rising toward the liquid supply port 22 in 30 can be reduced.
Further, the bubbles in the curved pipe portion 32 disappear with time, and since the upstream pipe portion 30 is located immediately above the bulging surface 48, it is discharged to the outside from the liquid supply port 22 via the upstream pipe portion 30. The water W flows smoothly from the curved pipe portion 32 to the first downstream pipe portion 34.
Therefore, in the liquid supply structure 20 of the vehicle 10 having the curved pipe portion 32 that converts the inflow direction of the urea water W supplied to the liquid supply port 22 in the vicinity of the liquid supply port 22, the urea water tank 24 is full. In spite of this, it is possible to prevent the urea water W remaining in the curved pipe portion 32 from rising and the sensor 5210 of the nozzle 5202 from erroneously detecting and stopping the supply of the urea water W. This is advantageous in improving the efficiency of the supply work to the urea water tank 24.

Further, in the present embodiment, the bulging surface 48 has a maximum cross-sectional area of the bending tube portion 32 cut at a plane orthogonal to the extending direction of the bending tube portion 32 at approximately the center in the extending direction of the bending tube portion 32. Formed as follows.
The portion of the bulging surface 48 at the approximately center in the extending direction of the bending tube portion 32 is a portion where the urea water W sprayed from the nozzle 5202 collides and bubbles are generated when the urea water W is supplied.
Therefore, it is more advantageous to reduce bubbles generated by the urea water W injected from the nozzle 5202 colliding with the bulging surface 48 and to reduce the apparent volume of the urea water W. This is advantageous in improving the efficiency of the supply work to 24.

In the present embodiment, the upstream bulging surface 48A is formed so as to rapidly increase the cross-sectional area of the bending tube portion 32 as it approaches the center in the extending direction of the bending tube portion 32. Since it does not extend to the portion 30, the space occupied by the upstream bulging surface 48A can be reduced while ensuring the cross-sectional area of the bending tube portion 32.
Therefore, while reducing the bubbles and efficiently reducing the apparent volume of the urea water W, the curved pipe portion 32 in which the upstream bulging surface 48A is formed has a minimum length, and the wheel house 14 and the splash shield 16 In the space S formed between them, it is advantageous for securing the degree of freedom of the layout of the piping 26, and it is advantageous for arranging the liquid piping.
Further, since the downstream bulging surface 48B is formed so as to gradually decrease the cross-sectional area of the bending tube portion 32 as it moves away from the center in the extending direction of the bending tube portion 32, the cross-sectional area of the bending tube portion 32 is rapidly reduced. Compared with the case of making it, the bubbles of the urea water W are more easily lost.
Therefore, the volume of the urea water W apparently reduced in the curved pipe portion 32 is effectively reduced, the rate at which the liquid level of the urea water W rises toward the liquid supply port 22 is reduced, and the urea water W Is more advantageous in smoothly flowing down from the curved pipe portion 32 to the urea water tank 24, and more advantageous in improving the efficiency of the operation of supplying the urea water W to the urea water tank 24.
Further, in the present embodiment, the liquid supply port 22 is disposed above the rear wheel 12 when viewed from the vehicle width direction, and the curved pipe portion 32 is more urea than the highest portion of the rear wheel 12 in the vehicle front-rear direction. Since it is arrange | positioned in the space between the wheel house 14 and the splash shield 16 in the back of the vehicle 10 which is the side by which the water tank 24 is arrange | positioned, the urea water is guided to the urea water tank 24 from the curved pipe part 32. The downstream pipe portion 34 and the second downstream pipe portion 36 can be disposed along the outline of the splash shield 16 that is directed rearward of the vehicle 10 (directed toward the urea water tank 24 side).
That is, the upstream pipe part 30 excluding the vicinity of the liquid supply port 22 in the limited space S between the wheel house 14 and the splash shield 16 that are dead spaces, the curved pipe part 32, the first downstream pipe part 34, The second downstream pipe portion 36 can be disposed, and the pipe 26 portion can be protected by the wheel house 14 and the splash shield 16, which is advantageous in arranging the liquid pipe.

  Although the present embodiment has been described with respect to the case where the liquid is urea water, the present invention adds the liquid to lower the combustion temperature of the particulate matter in the filter of the particulate filter as the exhaust gas purification device. Of course, various liquids such as an agent or a fuel supplied to an internal combustion engine may be used.

10 Vehicle 12 Rear wheel (wheel)
14 Wheel house 16 Splash shield 20 Liquid supply structure 22 Liquid supply port 24 Urea water tank (tank)
26 Piping 32 Curved pipe portion 48 Swelling surface 48A Upstream swelling surface 48B Downstream swelling surface 50 Region W Urea water (liquid)

Claims (4)

It has piping that connects the liquid supply port and the tank,
The piping is a liquid supply structure for a vehicle having a curved pipe portion where the piping is curved,
A bulging surface is formed on the outer side of the bending tube portion in the radius direction of curvature to enlarge the cross-sectional area of the bending tube portion.
A liquid supply structure for a vehicle. The bulging surface is formed so as to maximize the cross-sectional area at the approximate center in the extending direction of the bending tube portion.
The liquid supply structure for a vehicle according to claim 1. The bulging surface includes an upstream bulging surface positioned closer to the liquid supply port than the center in the extending direction of the bending tube portion, and a side farther from the liquid supplying port than the center in the extending direction of the bending tube portion. A downstream bulge surface located at
The length of the downstream bulging surface along the extending direction of the curved tube portion is formed with a dimension larger than the length of the upstream bulging surface,
The upstream bulging surface is formed so as to rapidly expand the cross-sectional area of the bending tube portion as it approaches the center in the extending direction of the bending tube portion,
The downstream bulging surface is formed so as to gradually reduce the cross-sectional area of the bending tube portion as it moves away from the center in the extending direction of the bending tube portion.
The vehicle liquid supply structure according to claim 2, wherein: The piping is arranged between a wheel house and a splash shield arranged outside the vehicle from the wheel house,
The curved pipe portion is arranged on the side where the tank is arranged in the front-rear direction of the vehicle from the highest portion of the wheel housed in the wheel house.
The vehicle liquid supply structure according to any one of claims 1 to 3, wherein the vehicle liquid supply structure is provided.

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