JP2014031755A - Exhaust device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust device for a vehicle that can be easily constituted at low cost, can reduce pressure loss due to exhaust resistance, and can easily drain and remove water to outside an exhaust pipe.SOLUTION: An upper part of an exhaust pipe 11 comprises a vertical exhaust pipe part 14A on the side of an engine 2 and a bent exhaust pipe part 14B connected thereto tilting from an upper end of the vertical exhaust pipe part backward and upward, and a backward exhaust port 15 is formed in the bent exhaust pipe part. A cylindrical member 21 is fitted around the bent exhaust pipe part with a gap S interposed, and a return part 28 is formed inward from an external end edge 27a of the cylindrical member. The return part is located outside the backward exhaust port, and an upper-end opening part 31 formed of its inner edge part is formed in a similar shape smaller than the backward exhaust port. Since no other body is present as exhaust resistance on an inner surface of the exhaust pipe, exhaust gas can be discharged powerfully in a pressure loss reduced state. The majority of drops of water come into contact with the return part and can be prevented from scattering from an upper-end opening part, and the drops of water fall along an external surface of the exhaust pipe, so that water can be easily drained to outside the exhaust pipe and removed.

Description

  The present invention relates to an exhaust device for a vehicle that is employed in, for example, an industrial vehicle such as a construction vehicle or a forklift equipped with a bucket device at the front.

  Conventionally, the following configuration is provided as this type. That is, the exhaust pipe is provided with a curved portion whose upper side (tip side) is curved, and the upper end portion (tip portion) of the exhaust pipe is inclined forward with respect to the vertical direction by the formation of the curved portion. Thus, an exhaust port at the upper end (tip) of the exhaust pipe is opened forward. And the water droplet capture | acquisition member is provided inside the upper end part (tip part) of the exhaust pipe. This water droplet capturing member has a water droplet damming ring that protrudes inwardly from the exhaust pipe, and a protrusion ring that protrudes in an annular shape from the inner end of the water droplet damming ring toward the base side of the exhaust pipe. It is fixed to the opening edge of each other by welding or the like.

  In such a conventional configuration, even when the engine is started with soot attached to the inner surface of the exhaust pipe and water droplets due to condensation, the water droplets and soot mixed together become a black liquid droplet. It rises along the inner surface and is reliably dammed by the water drop damming ring, and is not discharged from the exhaust port to the outside of the exhaust pipe, but accumulates inside the exhaust pipe. In addition, since the water droplet capturing member has a protruding ring, water droplets that are detached from the inner surface of the exhaust pipe can be captured by the water droplet capturing member and are not discharged to the outside from the exhaust port. Further, the water droplets contained in the exhaust gas in the exhaust pipe collide with the inner surface of the curved portion, and are pushed up from here to the upper end of the exhaust pipe by connecting the inner surface of the exhaust pipe. Damped on the side.

  And since the protruding ring is inclined upward toward the protruding end, water droplets blocked on the upper side of the water droplet damming ring accumulate on the protruding ring, and from here along the outer peripheral surface of the protruding ring It flows to the lower side. For this reason, the water droplets contained in the exhaust gas remain inside the exhaust pipe without being discharged from the exhaust port to the outside of the exhaust pipe. Therefore, when the engine is started, black liquid water droplets are not discharged from the exhaust port, and the surroundings of the exhaust pipe can be prevented from being contaminated by black liquid water droplets (see, for example, Patent Document 1).

JP 2008-261242 A (paragraph [0010], paragraph [0023], FIG. 5) Japanese Patent No. 3535690

  However, in the above-described conventional configuration, since the water droplet capturing member is provided inside the exhaust pipe, the exhaust gas discharged into the exhaust pipe collides with the water droplet capturing member. Pressure loss will increase. Further, since most of the water droplets are not discharged from the exhaust port to the outside of the exhaust pipe but remain inside the exhaust pipe, the drainage and removal thereof cannot be easily performed.

  Accordingly, the invention according to claim 1 of the present invention provides a vehicle exhaust system that can be configured simply and inexpensively, can reduce pressure loss due to exhaust resistance, and can easily drain and remove the exhaust pipe. It is intended to do.

  In order to achieve the above-mentioned object, an exhaust system for a vehicle according to claim 1 of the present invention is an exhaust system for a vehicle in which an exhaust pipe communicated with the engine side is disposed upward from the vehicle body side. The upper part of the exhaust pipe is composed of a vertical exhaust pipe part on the engine side, and a bent exhaust pipe part that is connected in an inclined manner from the upper end of the vertical exhaust pipe part to the rear upper side. A rear exhaust port is formed in the pipe portion, and a cylindrical member is provided that is fitted outside the bent exhaust pipe portion with a gap, and a return portion from the outer edge of the cylindrical member to the inside is provided. The return portion is formed outside the rear exhaust port, and the upper end opening formed by the inner edge of the return portion is formed in a small similar shape to the rear exhaust port. Is.

  Therefore, according to the first aspect of the present invention, the exhaust gas discharged from the engine to the exhaust pipe of the vehicle exhaust system flows vertically in the vertical exhaust pipe portion and then enters the bent exhaust pipe portion. After flowing through the inside of the cylindrical exhaust pipe in an upwardly inclined manner and discharged from the backward exhaust port into the cylindrical member, it can be discharged backward through the upper end opening of the cylindrical member. At this time, since the exhaust pipe has no other substance that becomes exhaust resistance on the inner surface, the exhaust gas can be discharged in a state in which the pressure loss is reduced.

  In addition, water droplets are likely to be generated while warming from the start of engine operation, and these water droplets can flow along the inner surface of the exhaust pipe due to the force of the exhaust gas, and can be discharged rearward from the rear exhaust port. At this time, since the return portion is located outside the rearward exhaust port, most of the water droplets can come into contact with the return portion to prevent scattering from the upper end opening. Then, the water droplets received by the return portion flow downward along the inner surface of the return portion, then flow into the gap, and drop down along the outer surface of the exhaust pipe.

  According to a second aspect of the present invention, the exhaust system for a vehicle according to the first aspect is provided with a cylindrical heat guard that is fixed by being fitted around the exhaust pipe with a gap. A return portion from the outer end edge portion of the upper heat guard fitted to the exhaust pipe portion to the inside is formed.

  Therefore, according to the second aspect of the present invention, the exhaust gas discharged from the engine into the exhaust pipe can be discharged from the rear exhaust port into the upper heat guard, and discharged backward through the upper end opening of the upper heat guard. obtain. The exhaust pipe is heated to a high temperature by such an exhaust gas flow, but the tubular heat guard is fitted and fixed over almost the entire length, so that the exhaust pipe is brought into direct contact with the surface of the exhaust pipe from the outside. Can protect against burns and fires. Moreover, the return part which receives a water droplet can be added to the upper heat guard of the heat guard which is a normal component.

  According to the first aspect of the present invention described above, the exhaust gas discharged from the engine to the exhaust pipe of the vehicle exhaust device flows vertically upward in the vertical exhaust pipe and then enters the bent exhaust pipe. After flowing through the bent exhaust pipe portion in a rearward and upward direction and discharged from the backward exhaust port into the cylindrical member, it can be discharged rearward through the upper end opening of the cylindrical member. At this time, since the exhaust pipe has no other exhaust resistance on its inner surface, the exhaust gas can be exhausted vigorously with reduced pressure loss.

  In addition, water droplets are likely to be generated while the engine is warmed from the start of operation, and the water droplets flow along the inner surface of the exhaust pipe by the force of the exhaust gas and can be discharged rearward from the rear exhaust port. At this time, since the return portion is located outside the rearward exhaust port, most of the water droplets abut on the return portion, and scattering from the upper end opening can be prevented. Then, the water droplets received by the return portion flow downward along the inner surface of the return portion, then flow into the gap, travel down to the outer surface of the exhaust pipe, and fall down to the outside of the exhaust pipe. Can be easily drained and removed. And a return part can be comprised simply and cheaply by adding to the normal component side.

  According to the second aspect of the present invention described above, the exhaust gas discharged from the engine to the exhaust pipe can be discharged from the rear exhaust port into the upper heat guard, and passes backward through the upper end opening of the upper heat guard. Can be discharged. The exhaust pipe is heated to a high temperature by such an exhaust gas flow, but the tubular heat guard is fitted and fixed over almost the entire length, so that the exhaust pipe is brought into direct contact with the surface of the exhaust pipe from the outside. Can protect against burns and fires. Moreover, the return part which catches a water droplet can be comprised simply and cheaply by adding to the upper heat guard of the heat guard which is a normal component.

1 is a rear view of a vehicle exhaust device according to a first embodiment of the present invention. FIG. It is a side view of the exhaust apparatus for vehicles. It is a rear view of the principal part of the exhaust apparatus for vehicles. It is a vertical side view of the principal part of the exhaust apparatus for vehicles. It is a cross-sectional top view of the intermediate part of the exhaust apparatus for vehicles. It is a cross-sectional top view of the upper end part of the exhaust apparatus for vehicles. It is a disassembled perspective view of the upper end part of the cylindrical member in the exhaust apparatus for vehicles.

[Embodiment 1]
Embodiment 1 of the present invention will be described below with reference to the drawings.
1 to 4, an engine 2 is mounted on a vehicle body 1 of a vehicle such as a forklift. A vehicle exhaust device 10 is provided at the rear of the vehicle body 1. The vehicle exhaust device 10 includes an exhaust pipe 11 disposed upward from the vehicle body 1 side and a heat fitted on the exhaust pipe 11. It is constituted by a guard (tubular member) 21 or the like.

  The exhaust pipe 11 is cylindrical and includes a lower exhaust pipe 12, an intermediate exhaust pipe 13, and an upper exhaust pipe 14. The lower exhaust pipe 12 is composed of a lower vertical exhaust pipe portion 12A and a lower bent exhaust pipe portion 12B which is continuously provided inclined downward from the lower end of the lower vertical exhaust pipe portion 12A. The lower bent exhaust pipe 12B is fixed to the vehicle body 1 through a flange-like member 16 fitted and fixed to the lower portion of the lower vertical exhaust pipe 12A, and the lower bent exhaust pipe 12B is connected to the engine 2 via a silencer or a connecting pipe. Communicated. The intermediate exhaust pipe 13 is connected to the lower vertical exhaust pipe portion 12A so as to be inclined upward from the upper end to the other side.

  The upper exhaust pipe 14 is connected to a long vertical exhaust pipe portion 14A provided in a vertical manner from the upper end of the intermediate exhaust pipe 13, and to be inclined rearward and upward from the upper end of the vertical exhaust pipe portion 14A. And a short bent exhaust pipe portion 14B. The bent exhaust pipe portion 14B is integrated with the upper end of the vertical exhaust pipe portion 14A. At this time, the inclination angle θ of the bent exhaust pipe portion 14B to the rear upper side is the vertical exhaust pipe portion axis ( The vertical axis) is about 150 degrees with respect to A, and is rearward and slightly outward. Further, the rearward exhaust port 15 of the bent exhaust pipe portion 14B is formed in a downwardly inclined shape, and at this time, the exhaust port edge line 15a is such that the upper end is slightly separated from the lower end with respect to the vertical exhaust pipe portion axis A. Inclined. That is, the front lower inclination angle β is about 10 degrees with respect to the vertical line a parallel to the vertical exhaust pipe axis A. An example of the exhaust pipe 11 is configured by the above 12-16 and the like.

  A tubular heat guard (cylindrical member) 21 is fitted and fixed to the exhaust pipe 11 over almost the entire length. Here, the inner diameter of the heat guard 21 is set larger than the outer diameter of the exhaust pipe 11. And is fitted outside the exhaust pipe 11 with a gap S therebetween. That is, the heat guard 21 is externally fitted to the lower heat guard 22 that is externally fitted to the lower vertical exhaust pipe 12A, the intermediate heat guard 23 that is externally fitted to the intermediate exhaust pipe 13, and the upper exhaust pipe 14. It consists of an upper heat guard 24. The upper heat guard 24 includes a vertical heat guard portion 24A that is externally fitted to the vertical exhaust pipe portion 14A, and a bent exhaust pipe that is connected to the upper end of the vertical heat guard portion 24A so as to be inclined rearward and upward. It consists of a bent heat guard portion 24B fitted on the portion 14B.

  The lower heat guard 22, the intermediate heat guard 23, and the vertical heat guard portion 24A are octagonal cylinders (an example of a rectangular cylinder) and have the same assembly configuration. That is, as shown in FIGS. 4 and 5, four portions of the perforated plate are bent by press molding or the like to form a U-shaped bent plate body 25 having five sides as a whole and surround the exhaust pipe 11. The two bent plate bodies 25 are coupled to each other and integrated (fixed) to the exhaust pipe 11 side via the connecting body 17 in a state where the side portions on the open side of the two bent plate bodies 25 are phase-polymerized. Is called.

  The connecting body 17 includes a nut body 18 fixed at two positions displaced by 180 degrees on the outer periphery of the lower vertical exhaust pipe portion 12A, the intermediate exhaust pipe 13, and the vertical exhaust pipe portion 14A, and a bi-fold plate body 25. A pair of left and right (a pair of front and rear) tightened and connected from a bolt body 19 that is passed from the outside through a through-hole 26 formed between a pair of phase-polymerized plate sides and screwed into the nut body 18. Has been. The pair of connecting members 17 are disposed at two locations (one or a plurality of locations) in the length direction of the lower vertical exhaust pipe portion 12A, the intermediate exhaust pipe 13 and the vertical exhaust pipe portion 14A.

  With the above configuration, the lower heat guard 22 is disposed outside the lower vertical exhaust pipe portion 12A, the intermediate heat guard 23 is disposed outside the intermediate exhaust pipe 13, and the vertical heat guard portion is disposed outside the vertical exhaust pipe portion 14A. 24A can be integrated (fixed) via the connecting body 17 in a state in which 24A is fitted with a substantially equal gap S therebetween.

  As shown in FIGS. 4, 6, and 7, the bent heat guard portion 24B has no phase polymerization plate portion on the rear exhaust port 15 side (rear position) compared to the vertical heat guard portion 24A. Thus, the three portions of the perforated plate are bent by press molding or the like to form a U-shaped bent plate body 27 having four sides as a whole. At this time, the perforated plate is such that the outer edge 27a of the bent plate body 27 has an inclined surface parallel to the inclination of the exhaust port edge line 15a outside the exhaust port edge line 15a of the rearward exhaust port 15. Is formed. Then, a return portion 28 made of a C-shaped (inverted C-shaped) plate body is welded to the outer end edge portion 27a at the outer end edge portion 27a so as to face each other inward. Protrusively formed. Here, the return portion 28 is configured such that the end faces 28a opposed to each other at two locations on the upper and lower sides are equivalently contacted (butted together). A bent body 29 protruding into the gap S is integrally formed from the lower ends of the two return portions 28.

  Therefore, the side portions on the open side of the two bent plate bodies 27 are phase-polymerized so as to surround the bent exhaust pipe portion 14B, and the opposed end surfaces 28a of the two return portions 28 are connected to each other (matching). In this state, the bent plate body 27 is joined and integrated (fixed) to the bent exhaust pipe portion 14B (exhaust pipe 11) side through the connecting body 17. At that time, the connecting body 17 is acted through a through-hole 30 formed between a pair of side edges of the two folded plate bodies 27 that are phase-polymerized.

  With the above-described configuration, the bent heat guard portion 24B can be integrated (fixed) via the connecting body 17 in a state where the bent heat guard portion 24B is fitted outside the bent exhaust pipe portion 14B with a gap S therebetween. At this time, the return portion 28 is positioned outward of the rearward exhaust port 15 (outwardly corresponding to the gap S), and an upper end opening formed by the opposed inner edge portions of the return portions 28. 31 is formed in a small similar shape with respect to the rearward exhaust port 15 of the vertical elliptical shape. That is, the upper end opening 31 is formed in a downwardly inclined shape like the rearward exhaust port 15, and the upper end opening height h is about 80% with respect to the rearward exhaust port height H when viewed in the vertical direction. ing. Therefore, the return portion 28 is opposed to the outside of the rearward exhaust port 15 with a length corresponding to about 10% of the rearward exhaust port height H. Note that the width of the return portion 28 in the vertical and horizontal directions is set in consideration of the sum of the length of the rear exhaust port height H of about 10% and the length of the gap S. An example of the heat guard 21 is configured by the above 22-31 and the like.

Hereinafter, the operation in the first embodiment will be described.
The exhaust gas G from the engine 2 is discharged to the vehicle exhaust device 10 through a silencer or the like. That is, as shown in FIGS. 2 and 4, the exhaust gas G discharged to the lower bent exhaust pipe portion 12B in the exhaust pipe 11 flows vertically upward in the lower vertical exhaust pipe portion 12A, and then the intermediate portion. It enters the exhaust pipe 13 and flows in an inclined manner in the middle exhaust pipe 13 upward. Next, the exhaust gas G flows vertically upward in the vertical exhaust pipe portion 14A, and then enters the bent exhaust pipe portion 14B. Then, the exhaust gas G is discharged from the backward exhaust port 15 into the bent heat guard portion 24B, and is discharged backward through the upper end opening 31 of the bent heat guard portion 24B.

  As the exhaust gas G flows in the vehicle exhaust device 10 in this manner, the exhaust sound can be released (exhausted) from the upper side of the vehicle body 1 to the rear upper side, thereby reducing the noise around the vehicle. it can. Further, since there is no other substance that becomes exhaust resistance on the inner surface of the exhaust pipe 11, the exhaust gas G can be exhausted vigorously in a state in which the pressure loss is reduced. The exhaust pipe 11 is heated to a high temperature by such a flow of the exhaust gas G, but the tubular heat guard (cylindrical member) 21 is fitted and fixed over almost the entire length, so that the exhaust pipe 11 is exhausted from the outside. Burns due to direct contact with the surface of the tube 11, fire occurrence, etc. can be protected.

  Further, during the period from the start of operation of the engine 2, water droplets W (water droplets made of a transparent liquid material) are easily generated, and the water droplets W flow with the exhaust gas G. That is, the water droplet W flows along the inner surface of the exhaust pipe 11 by the momentum of the exhaust gas G, and is discharged rearward from the rearward exhaust port 15. At this time, since the return portion 28 is positioned outside the rearward exhaust port 15, most of the water droplets W abut on the return portion 28, and discharge (scattering) from the upper end opening 31 can be prevented. The water droplet W received by the return portion 28 flows downward along the inner surface of the return portion 28, is received by the upper surface of the bent body 29, then flows into the gap S, and travels down to the outer surface of the exhaust pipe 11. Will fall into.

  Therefore, most of the water droplets W discharged backward from the rearward exhaust port 15 can be prevented from being scattered by the return portion 28, and through the gap S between the exhaust pipe 11 and the heat guard 21 to the outside of the exhaust pipe 11. Can be easily drained and removed. And the return part 28 can be comprised simply and cheaply by adding to the heat guard 21 side which is a normal component.

  In the first embodiment described above, the exhaust pipe 11 includes the lower exhaust pipe 12, the intermediate exhaust pipe 13, and the upper exhaust pipe 14, and the intermediate exhaust pipe 13 is inclined to prevent interference with other objects in the layout. However, this is a type without an inclined structure in the middle, that is, one vertical exhaust pipe portion 14A is erected from the vehicle body 1 side, and the upper end of this vertical exhaust pipe portion 14A is shown. Alternatively, the bent exhaust pipe portion 14B may be continuously provided so as to be inclined rearward and upward.

  In the first embodiment described above, the heat guard 21 is shown as the cylindrical member, but this may be another normal tubular part set in the exhaust pipe 11, and the heat guard is a protective member. Also called plate or heat protection.

  In the first embodiment described above, the form in which the octagonal tubular heat guard 21 is employed as the tubular member is shown. However, as the tubular member, the square member such as a rectangular tubular member or a polygonal tubular member is used. A cylindrical type or a type adopting a cylindrical type may be used.

  In the first embodiment described above, a form in which the rearward upward inclination angle θ of the bent exhaust pipe portion 14B is about 150 degrees with respect to the vertical exhaust pipe portion axis (vertical axis) A is shown. However, the inclination angle θ is suitably changed, such as about 140 degrees or about 160 degrees.

  In the first embodiment described above, the rearward exhaust port 15 is formed in a downwardly inclined shape with the front lower inclination angle β being about 10 degrees with respect to the vertical line a parallel to the vertical exhaust pipe axis A. The downward inclination type is suitable for preventing rain from entering, but the front downward inclination angle β is arbitrarily adjusted, and is parallel to the vertical line a and has no inclination. It may be an upwardly inclined form.

  In the first embodiment described above, there is shown a form in which the return portion 28 is opposed to the outside of the rearward exhaust port 15 at a length corresponding to about 10% of the rearward exhaust port height H. The facing ratio is adjusted based on the effect of preventing water droplets W from scattering and the effect of reducing pressure loss. That is, for example, the upper end opening height h is about 70% or about 90% with respect to the rearward exhaust port height H, and the rearward exhaust port height H is about 1.5% or about 0.5%. It is adjusted to a format in which the return portions 28 are opposed to each other with a length corresponding to the split.

  In the first embodiment described above, the bent heat guard portion 24B is shown as having a pair of bent plate bodies 27, but this is formed by welding between the bent plate bodies 27 and between the end faces 28a of the return portions 28. The integrated form may be used.

  In the above-described first embodiment, as the return portion 28, the end face 28a opposed to each other at the two upper and lower locations is shown to be equivalent (butted), but this is the case at the upper and lower two locations. It may be in the form of phase polymerization.

  In the first embodiment described above, a form in which the bent body 29 that protrudes into the gap S from the lower end of the two return portions 28 is integrally formed is shown, but this is a form in which the bent body 29 is omitted. May be.

DESCRIPTION OF SYMBOLS 1 Car body 2 Engine 10 Exhaust device 11 for vehicles Exhaust pipe 14 Upper exhaust pipe 14A Vertical exhaust pipe part 14B Bent exhaust pipe part 15 Backward exhaust port 15a Exhaust port edge line 16 Gutter-shaped member 17 Connection body 21 Heat guard (cylindrical shape) Element)
24 Upper heat guard 24A Vertical heat guard portion 24B Bent heat guard portion 25 Bending plate body 27 Bending plate body 27a Outer edge portion 28 Return portion 28a End surface 29 Folding body 31 Upper end opening β Front downward inclination angle S Clearance H Backward Exhaust port height h Upper end opening height G Exhaust gas W Water drop

Claims (2)

  An exhaust pipe for a vehicle in which an exhaust pipe communicated with the engine side is disposed upward from the vehicle body side, and an upper part of the exhaust pipe includes a vertical exhaust pipe section on the engine side and the vertical exhaust pipe section And a bent exhaust pipe portion that is continuously inclined from the upper end to the rear upper side, and a rear exhaust port is formed in the bent exhaust pipe portion. A tubular member to be fitted is provided, and an inward return portion is formed from the outer end edge portion of the tubular member, and the return portion is located outward of the rearward exhaust port, and the inner edge portion The vehicular exhaust apparatus, wherein the upper end opening formed is formed in a similar shape smaller than the rearward exhaust port. A cylindrical heat guard that is fitted and fixed with a gap in the exhaust pipe is provided, and an inward return portion is formed from the outer edge of the upper heat guard that is fitted on the bent exhaust pipe. The vehicle exhaust device according to claim 1, wherein the vehicle exhaust device is provided.

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