JP2018165114A - Rolling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling vehicle which prevents suction of outside air from a tire house to a heat exchanger cover, and can avoid situation where dust entered from an outside introduction port together with outside air is burnt by contact with an exhaust pipe in a heat exchanger cover.SOLUTION: A heat exchanger is arranged between an engine room and an outside air introduction chamber, and a heat exchanger cover 26 is fixed to a lower side of the outside air introduction chamber and is caused to communicate with the outside air introduction chamber. An exhaust pipe 31 of an engine extends to a tire house through the outside air introduction chamber and an exhaust through hole 32 of a bottom wall 26c of the heat exchanger cover 26. By a negative pressure during engine operation, outside air is introduced from the outside introduction port into the outside introduction chamber and the heat exchanger cover 26 to distribute the heat exchanger. The bottom wall 26c is molded into an inverted V shape in a side view, a discharge hole 36 is formed on the lowermost end of longitudinal inclination, and a peak P of the bottom wall 26c is positioned at the center of a cross-sectional contour line E forming a circular shape of the exhaust pipe 31.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a compaction vehicle, and more particularly to an exhaust structure that exhausts exhaust gas from an engine mounted as a driving power source to the vicinity of a road surface.

  Various exhaust structures are employed in industrial machines used for construction and the like in accordance with their forms. For example, in a mini excavator described in Patent Document 1, an exhaust pipe through which exhaust gas from an engine is guided is erected on a revolving body to which a working device is attached, and exhaust gas is discharged from the upper part thereof. An exhaust pipe cover is attached to the exhaust pipe so as to cover the exhaust pipe with a predetermined gap, thereby preventing contact with the periphery of the exhaust pipe.

  Because of such an exhaust structure, dust such as dead leaves may enter the gap between the exhaust pipe and the exhaust pipe cover, and dust tends to burn by contact with the hot exhaust pipe. A cutout is formed on the surface so that dust can be easily cleaned and removed with a brush or the like.

  On the other hand, compaction vehicles such as tire rollers and vibration rollers, which are a type of industrial machine, travel on the roadbed or roadbed while traveling with front and rear compaction wheels that also serve as traveling wheels provided at the front and rear of the vehicle body. Work to compact paving materials such as gravel and asphalt. During pavement construction, water is sprayed onto the compaction wheel for the purpose of preventing adhesion of the pavement material to the compaction wheel, or water is sprayed onto the road surface for the purpose of promoting cooling and hardening of the road surface after the compaction, A large amount of water used for these applications is stored in a water storage tank provided inside the rolling compaction vehicle.

  A compaction vehicle travels by driving a compaction wheel by HST (Hydro Static Transmission) using an engine as a power source, and engine exhaust cannot adopt normal rear exhaust due to restrictions on the layout of a water storage tank or HST. In response, for example, it is discharged from the tire house of the front rolling wheel to the vicinity of the road surface.

FIG. 2 is a cross-sectional view showing an engine room and an outside air introduction chamber of a tire roller as a rolling compaction vehicle, and actually shows a vehicle according to an embodiment of the present invention. The exhaust structure of the rolling vehicle will be described.
An outside air introduction chamber 20 is adjacent to the engine room 9 via a heat exchanger 21 such as a radiator, and the engine room 9 and the outside air introduction chamber 20 are covered from above by a hood 11 that can be opened and closed. When the cooling fan 10 a is driven by the engine 10, due to the negative pressure generated in the engine room 9, outside air is introduced into the outside air introduction chamber 20 from the outside air introduction port 24 provided in the hood 11, and the heat exchanger 21 is further connected. After that, it circulates into the engine room 9.

  The exhaust pipe 31 of the engine 10 extends from the engine room 9 through the outside air introduction chamber 20 to the inside of the tire house 15 of the front rolling tire 3f located below. By the guidance of the exhaust pipe 31, the exhaust gas from the engine 10 is discharged near the road surface.

Although the heat exchanger cover 26 shown in FIG. 2 is an embodiment of the present invention, the heat exchanger cover 101 shown in FIG. 12 is used instead in the prior art exhaust structure. This figure corresponds to the view A in FIG.
The heat exchanger cover 101 is manufactured by bending a steel plate, and is disposed below the outside air introduction chamber 20. The heat exchanger cover 101 has a concave shape as a whole toward the rear of the vehicle to cover the front surface of the heat exchanger 21, and its upper and lower portions are open. Due to the negative pressure generated in the engine room 9 by the cooling fan 10a, the outside air is introduced into the heat exchanger cover 101 through the gap 102 formed in the bottom wall 20c of the outside air introduction chamber 20, and further heat exchange as described above. It circulates in the engine room 9 through the vessel 21.

  An exhaust pipe 31 from the engine 10 is disposed so as to penetrate the interior of the heat exchanger cover 101 configured as described above vertically.

JP2013-203141A

  However, in the exhaust structure of the conventional tire roller shown in FIG. 12, the upper and lower portions of the heat exchanger cover 101 are opened widely so as to penetrate the exhaust pipe 31 up and down. Not only the outside air from the outside air inlet 24 but also the outside air in the tire house 15 is sucked and flows through the heat exchanger 21. The outside air in the tire house 15 close to the road surface may contain dust and mud, and may contain an anti-adhesive agent sprayed on the front rolling tire 3f to prevent the pavement material from adhering. Since these dust, mud, anti-adhesive agent, etc. adhere to and accumulate on the core of the heat exchanger 21, it is necessary to clean the heat exchanger 21 frequently, and unexpected troubles in the operating equipment in the engine room 9 occur. It can be a factor.

  If the upper part of the heat exchanger cover 101 is connected to the outside air introduction chamber 20 and the lower part is closed, the intake of outside air in the tire house 15 is eliminated. However, the upper connection of the heat exchanger cover 101 has no problem, but the lower blockage causes a new problem of dust accumulation in the heat exchanger cover 101.

  That is, the outside air from the outside air inlet 24 located on the upper side of the vehicle 1 may contain dust such as dead leaves, although it does not contain the above-mentioned sand dust, mud, adhesion preventing agent, and the like. A mesh panel 25 is provided at the outside air inlet 24 to prevent the entry of dust, but a part of the dust enters the outside air introduction chamber 20 and the heat exchanger cover 101 together with the outside air. .

  In the prior art shown in FIG. 12, since the lower part of the heat exchanger cover 101 is opened, the invading dust is discharged downward without accumulating. However, if the lower portion of the heat exchanger cover 101 is closed to prevent the intake of outside air from the inside of the tire house 15, dust accumulation cannot be avoided, and the accumulated dust may come into contact with the exhaust pipe 31 and burn.

  As a result, there is a trade-off relationship between prevention of inhalation of outside air in the tire house 15 and prevention of dust accumulation in the heat exchanger cover 101, and there is no measure for solving both of them. Although the technique of Patent Document 1 has been proposed as a countermeasure for eliminating the complexity of cleaning up dust, the exhaust structure is fundamentally different from that of the prior art shown in FIG. 12, and thus cannot be a solution. It was.

  The present invention has been made to solve such problems, and its object is to prevent outside air from being sucked into the heat exchanger cover from inside the tire house close to the road surface, and then introduce outside air. An object of the present invention is to provide a rolling-compact vehicle capable of avoiding a situation in which dust that enters with heat from the mouth and accumulates in a heat exchanger cover burns due to contact with an exhaust pipe.

  In order to achieve the above object, the compaction vehicle of the present invention is defined adjacent to an engine room in which an engine of a driving power source is housed, and outside air is passed through an outside air inlet opening above a vehicle body panel. Heat exchange that is arranged between the outside air introduction chamber to be introduced, and between the outside air introduction chamber and the engine room, and exhibits cooling action of the engine by heat exchange with the outside air flowing from the outside air introduction chamber to the engine And exhaust extending from the engine room through the outside air introduction chamber to the outside through an exhaust through hole formed in the bottom wall of the outside air introduction chamber, and guiding the engine exhaust gas to the vicinity of the road surface And a bottom wall of the outside air introduction chamber is formed so as to form an oblique shape having a vertex located within a cross-sectional outline of the exhaust pipe.

  According to the rolling compaction vehicle of the present invention, after preventing the outside air from being sucked into the outside air introduction chamber from the lower outside near the road surface, the dust that has entered the outside air introduction port together with the outside air and accumulated in the outside air introduction chamber is separated from the exhaust pipe. It is possible to avoid the situation of burning due to the contact of.

It is a side view showing a tire roller of an embodiment. It is sectional drawing which shows the engine room and external air introduction chamber of the tire roller of 1st Embodiment with the management of an exhaust pipe. It is sectional drawing equivalent to A arrow of FIG. 2 which shows the inside of the heat exchanger cover of 1st Embodiment, and an exhaust pipe. It is sectional drawing equivalent to the B arrow of FIG. 2 which shows the inside of the heat exchanger cover of 1st Embodiment, and an exhaust pipe. It is the D arrow line view of Drawing 2 which shows the inside of the heat exchanger cover of a 1st embodiment, and an exhaust pipe. It is the C arrow line view of FIG. 2 which looked at the heat exchanger cover of 1st Embodiment from front diagonally downward. It is sectional drawing equivalent to A arrow of FIG. 2 which shows the inside of the heat exchanger cover of another example of 1st Embodiment, and an exhaust pipe. It is sectional drawing equivalent to A arrow of FIG. 2 which shows the inside of the heat exchanger cover of 2nd Embodiment, and an exhaust pipe. It is sectional drawing equivalent to the B arrow of FIG. 2 which shows the inside of the heat exchanger cover of 2nd Embodiment, and an exhaust pipe. It is the arrow D figure of FIG. 2 which shows the inside of the heat exchanger cover of 2nd Embodiment, and an exhaust pipe. It is the arrow D figure of FIG. 2 which shows the inside of the heat exchanger cover of another example of 2nd Embodiment, and an exhaust pipe. It is the C arrow line view of FIG. 2 which looked at the heat exchanger cover of the prior art from the diagonally downward front.

Hereinafter, an embodiment in which the rolling vehicle of the present invention is embodied as a tire roller will be described.
FIG. 1 is a side view showing the tire roller of the present embodiment, and FIG. 2 is a cross-sectional view showing the engine room and the outside air introduction chamber of the tire roller together with the exhaust pipe. In the following description, the front / rear, left / right, and up / down directions are expressed mainly with respect to the driver who has boarded the vehicle.

  Three rubber front rolling tires 3f that also serve as running wheels are provided at the front part of a vehicle body 2 of a tire roller 1 (hereinafter also referred to as a vehicle), and these front rolling tires 3f. Are arranged in parallel in the left-right direction. Further, four rubber rear rolling tires 3r that also serve as traveling wheels are provided at the rear of the vehicle body 2, and these rear rolling tires 3r are arranged in parallel in the left-right direction.

  An operation console 5 having a steering 4 is installed on the vehicle body 2, a driver seat 6 is installed on the rear side of the operation console 5, and a roof 7 is provided so as to cover the operation console 5 and the driver seat 6 from above. Is provided. An operator seated in the driver's seat 6 operates the tire roller 1 by operating pedals (not shown) on the steering 4 and the floor 8, and the road surface by the front and rear compressed tires 3 f and 3 r during the rolling operation. The paving material placed on the floor is compacted.

  Although not shown, the vehicle body 2 is made of a frame made by welding steel plates, and an engine room 9 defined immediately before the operation table 5 accommodates various devices such as an engine 10 and an HST, and an openable hood 11 ( The vehicle body panel) is covered from above. A sealed space is defined by the vehicle body frame on both the left and right sides of the engine room 9 and below the engine room 9, and these sealed spaces communicate with each other and function as the water storage tank 12.

  A front water sprinkling pipe 13f is supported near the front rolling tire 3f, and a rear water sprinkling pipe 13r is supported near the rear rolling tire 3r. These water sprinkling pipes 13f and 13r are connected to the water storage tank 12 via a pipe (not shown). During the rolling operation, the water stored in the water storage tank 12 is pumped up by a pump and passes through the pipe to each water sprinkling pipe 13f. , 13r, and water is sprayed on the outer peripheral surfaces of the front and rear rolling tires 3f, 3r to prevent the pavement material from adhering.

  As shown in FIG. 2, the front rolling tire 3 f is disposed in a tire house 15 formed at the foremost part of the vehicle body 2 and is rotatably supported by the steering frame 16. The steering frame 16 is connected to a turning bearing 18 on the vehicle body 2 side via a yoke 17, and the yoke 17 and the steering frame 16 are rotated in the horizontal direction according to the operation of the steering 4 by a hydraulic steering device (not shown). The partial rolling tire 3f is steered.

  An outside air introduction chamber 20 is defined adjacent to the front side of the engine room 9, and the outside air introduction chamber 20 has a lateral width substantially equal to that of the engine room 9. A heat exchanger 21 such as a radiator for cooling the engine 10 is disposed between the outside air introduction chamber 20 and the engine room 9. The outside air introduction chamber 20 is defined by the following wall surfaces. The left and right sides are each defined by a side wall 20a, the front is defined by a front wall 20b, the lower front is defined by a bottom wall 20c, the lower rear is defined mainly by a heat exchanger cover 26 described later, and the upper is defined by a hood 11. The rear side faces the heat exchanger 21 without being defined.

  The bottom wall 20c of the outside air introduction chamber 20 is disposed at the same height as the swivel bearing 18, in other words, at a substantially intermediate position in the height direction of the heat exchanger 21, and an air cleaner 22 is disposed on the bottom wall 20c in the outside air introduction chamber 20. It is fixed by a bracket 23. A square-shaped outside air inlet 24 is formed at a position corresponding to the air cleaner 22 of the hood 11 immediately above.

  A mesh panel 25 is fixed to the outside air introduction port 24 in order to prevent dust such as dead leaves from entering through the outside air introduction port 24 opened upward. The mesh panel 25 of the present embodiment is manufactured by weaving a wire material vertically and horizontally. However, the configuration of the mesh panel 25 is not limited to this, and for example, punching metal may be used.

  3 is a cross-sectional view corresponding to the arrow A in FIG. 2 showing the inside of the heat exchanger cover and the exhaust pipe, and FIG. 4 is a cross-section corresponding to the arrow B in FIG. 2 showing the inside of the heat exchanger cover and the exhaust pipe. FIG. 5 is a view taken in the direction of arrow D in FIG. 2 showing the inside of the heat exchanger cover and the exhaust pipe. FIG. 6 is a view taken in the direction of arrow C in FIG.

As shown in FIGS. 2 to 6, the heat exchanger cover 26 is manufactured by bending a steel plate, and is disposed below the outside air introduction chamber 20 so as to face the tire house 15. The heat exchanger cover 26 is composed of left and right side walls 26a, a front wall 26b, and a bottom wall 26c as a whole, and is recessed toward the rear of the vehicle to cover the lower half of the front surface of the heat exchanger 21.
The shape of the heat exchanger cover 26 will be described in detail. Flange portions 26d are formed at the rear ends of the left and right side walls 26a. These flange portions 26d are connected to the bracket 27 that fixes the heat exchanger 21 to the vehicle body 2. Thus, the heat exchanger cover 26 is fixed to the vehicle body 2. The left and right side walls 26 a of the heat exchanger cover 26 and the upper end of the front wall 26 b are connected to the bottom wall 20 c of the outside air introduction chamber 20.

  As a result, the heat exchanger cover 26 functions as a part of the outside air introduction chamber 20 by communicating with the inside of the outside air introduction chamber 20 to form one space. The inside of the heat exchanger cover 26 communicates with the outside from the outside air inlet 24 through the outside air introduction chamber 20 on the one hand, and communicates with the inside of the engine room 9 through the heat exchanger 21 on the other hand. In the present invention, the inside of the heat exchanger cover 26 is also regarded as a part of the outside air introduction chamber 20, but in the present embodiment, for the sake of convenience, the inside of the heat exchanger cover 26 is described as being separate from the inside of the outside air introduction chamber 20.

  When the cooling fan 10a is driven by the engine 10, the outside air is introduced from the outside air introduction port 24 into the outside air introduction chamber 20 and the heat exchanger cover 26 by the negative pressure generated in the engine room 9, and further heat exchange is performed. It circulates in the engine room 9 through the vessel 21. The outside air is sucked as the intake air of the engine 10 from the air cleaner 22 in the outside air introduction chamber 20 and also has a cooling action of the engine 10 by heat exchange with the heat exchanger 21.

  On the other hand, as shown in FIG. 2 in particular, the exhaust pipe 31 of the engine 10 has a circular pipe shape, extends horizontally from the engine room 9 into the outside air introduction chamber 20, and is bent downward at a right angle at the center in the vehicle width direction. ing. The exhaust pipe 31 extends downward from the bent portion, passes through the outside air introduction chamber 20 and the heat exchanger cover 26, and passes through the circular exhaust through hole 32 formed in the bottom wall 26c. It extends to the inside of the tire house 15 of the rolling tire 3f. The exhaust pipe 31 is fixed to the vehicle body 2 side by a bracket 33 and has a lower end connected to a muffler end 34 fixed to the bottom surface of the vehicle body 2.

  By the guidance of the exhaust pipe 31, the exhaust gas from the engine 10 is exhausted rearward from the muffler end 34 in the vicinity of the road surface. Such exhaust gas discharge position and discharge direction are designed in consideration of the influence of exhaust gas on workers working in the surroundings while the tire roller 1 is in operation.

  Incidentally, as described in [Problems to be Solved by the Invention], in the prior art shown in FIG. 12, the upper and lower portions of the heat exchanger cover 101 are largely opened, and therefore, due to the negative pressure in the engine room 9. There is a problem that outside air from the inside of the tire house 15 containing dust, mud, anti-adhesive agent, etc. is sucked into the heat exchanger cover 101, causing troublesome cleaning and troubles of the heat exchanger 21. Further, when the lower portion of the heat exchanger cover 101 is closed to prevent the intake of outside air, there is a possibility that dust such as dead leaves accumulates in the heat exchanger cover 101 and burns by contact with the exhaust pipe 31. Therefore, both are in a trade-off relationship.

  In view of such problems, the present inventor has paid attention to a portion in the heat exchanger cover 26 where dust accumulation should be prevented. That is, it is necessary to prevent dust accumulation not only on the entire bottom wall 26 c in the heat exchanger cover 26 but on the periphery of the exhaust pipe 31 that may come into contact with the exhaust pipe 31. Therefore, if the bottom wall 26c is formed in an oblique shape so as to keep the dust away from the exhaust pipe 31, it is possible to prevent the dust from being burned by preventing the dust from contacting the exhaust pipe 31.

  Furthermore, if an exhaust hole for communicating the inside of the heat exchanger cover 26 and the lower outside (inside the tire house 15) is formed at the bottom of the inclined bottom wall 26c, the dust that has entered the heat exchanger cover 26 accumulates. Without being done, the bottom wall 26c is discharged in small amounts along the inclination of the bottom wall 26c. Therefore, it is possible to suppress the intake of outside air by keeping the discharge hole to a minimum size.

  Based on the above knowledge, in the present embodiment, the bottom wall 26c of the heat exchanger cover 26 is formed in an oblique shape, and a discharge hole is formed in the skirt portion thereof, which will be described as the first and second embodiments below. .

[First Embodiment]
The bottom wall 26c of the heat exchanger cover according to the present embodiment has two flat front and rear surfaces, and is formed by folding a steel plate (plate material) in half so as to form an inverted V shape when viewed from the side (one side). Has been. The left and right ends of the bottom wall 26c are welded to the side wall 26a, and the front and rear ends of the bottom wall 26c are separated from the front wall 26b and the heat exchanger 21, respectively. A discharge hole 36 having a belt shape is formed in the left-right direction for communicating the inside of the exchanger cover 26 and the inside of the tire house 15.

  A circular exhaust through hole 32 is formed in the center of the apex P of the bottom wall 26 c in the left-right direction, and the exhaust pipe 31 is inserted into the exhaust through hole 32. The inner peripheral edge of the exhaust through hole 32 and the outer peripheral surface of the exhaust pipe 31 may be separated from each other through a slight gap, may be brought into contact with each other, or may be joined by welding or the like.

  As a result, when viewed from the side, the apex P of the bottom wall 26c is positioned at the center of the circular cross-sectional outline E of the exhaust pipe 31. Then, with the exhaust pipe 31 as a reference, one surface of the bottom wall 26c is inclined so as to be lowered forward, and the other surface is inclined so as to be lowered rearward. A hole 36 is opened.

  Accordingly, the dust that has passed through the mesh panel 25 and has entered the heat exchanger cover 26 moves forward or backward following the inclination of either the front surface or the rear surface forming the bottom wall 26c, and reaches the lowest end of the inclination. Then, it is discharged downward from the discharge hole 36.

  For this reason, of the dust that has entered the heat exchanger cover 26, the dust that has fallen to a location separated from the exhaust pipe 31 on the bottom wall 26c, as well as the dust that has reached a position close to the exhaust pipe 31, that is, the exhaust gas. Dust that may burn in contact with the pipe 31 is also moved away from the exhaust pipe 31 by the inclination of the bottom wall 26c. Since any dust is finally discharged downward from the discharge hole 36, it is possible to avoid a situation in which dust is burned by contact with the exhaust pipe 31.

  Further, the connection portion between the upper portion of the heat exchanger cover 26 and the outside air introduction chamber 20 is sealed, and the lower portion of the heat exchanger cover 26 is only formed with a pair of discharge holes 36 having a band shape. As described above, the dust that has entered the heat exchanger cover 26 is discharged from the discharge hole 36 little by little following the inclination of the bottom wall 26c, so that the size of the discharge hole 36 is minimized and sufficiently discharged. Can achieve the function.

  For this reason, the outside air in the tire house 15 sucked into the heat exchanger cover 26 through the discharge hole 36 is kept to a minimum, and problems caused by dust, mud, anti-adhesive agent, etc. contained in the outside air, such as heat It is possible to prevent frequent cleaning of the exchanger 21 and troubles of operating equipment in the engine room 9 in advance.

  As is apparent from the above description, all the dust that has entered the heat exchanger cover 26 is moved away from the exhaust pipe 31 by the inclination of the bottom wall 26c. The dust once having lowered the inclination of the bottom wall 26c cannot approach the exhaust pipe 31 again by going back the inclination of the bottom wall 26c.

  In the present embodiment, the dust is automatically discharged by forming the discharge hole 36 at the lowermost slope of the bottom wall 26c, and the heat exchanger cover 26 is not required to be cleaned. Assuming that the exhaust hole 36 may be omitted, the lower portion of the heat exchanger cover 26 may be completely closed. In this case, the dust may be cleaned before the dust accumulates on the bottom wall 26c and reaches the height of the exhaust pipe 31. Since the outside air from the inside of the tire house 15 is not sucked into the heat exchanger cover 26, problems caused by dust, mud, an adhesion preventing agent, etc. can be completely eliminated.

On the other hand, it is also possible to prevent the outside air from being sucked in from the tire house 15 without omitting the discharge hole 36 as described above, which will be described below as another example of the first embodiment.
Since the basic configuration of this another example is the same as that of the exhaust structure of the first embodiment, the description of the overlapping parts is omitted, and the differences are focused on.

FIG. 7 is a cross-sectional view corresponding to the arrow A in FIG. 2 showing the inside of the heat exchanger cover 26 and the exhaust pipe 31 of another example.
A base end of a flexible sheet 41 made of rubber or the like is attached to the front end and the rear end of the bottom wall 26c, that is, the lowermost end in the inclined direction, by bolts 42, respectively. The left-right width of the flexible sheet 41 is the same as that of the discharge hole 36, and the longitudinal length is set longer than that of the discharge hole 36.

  When no negative pressure is generated in the heat exchanger cover 26 due to the engine being stopped, each flexible sheet 41 hangs down by its own weight, and the leading ends thereof are fixed to the fixing bracket 27 (inner wall) and the front wall 26b ( The exhaust hole 36 is opened toward the inside of the lower tire house 15.

  When the engine 10 is operated and negative pressure is generated in the heat exchanger cover 26, the flexible sheets 41 are sucked up by the negative pressure, and their tips are brought into contact with the fixed bracket 27 and the front wall 26b. As a result, the discharge hole 36 is closed, so that the outside air in the tire house 15 is not sucked into the heat exchanger cover 26, and only the outside air above the vehicle body 2 from the outside air introduction port 24 is introduced. Therefore, it is possible to prevent problems caused by dust, mud, adhesion preventing agents and the like contained in the outside air from the tire house 15 in advance.

  During operation of the engine 10, dust such as dead leaves enters the heat exchanger cover 26 together with the outside air introduced from the outside air inlet 24 and falls down on the bottom wall 26c. These dusts move forward or backward following the inclination of any surface before and after forming the bottom wall 26c, and move to the lowest end of the inclination.

  When the flexible sheet 41 hangs down when the engine is stopped, the discharge hole 36 is opened, and dust is discharged downward through the discharge hole 36. As a result, while preserving the function of automatically discharging the dust through the discharge hole 36, the inhalation of the outside air from the inside of the tire house 15 is eliminated, and the problems caused by dust, mud, anti-adhesive agent, etc. are completely eliminated. be able to.

[Second Embodiment]
Next, a second embodiment will be described. The difference from the first embodiment lies in the shape of the bottom wall 26c of the heat exchanger cover 26, and other configurations are the same as those of the first embodiment. Therefore, the description of the overlapping part is omitted, and the differences are mainly described.

  8 is a cross-sectional view corresponding to the arrow A in FIG. 2 showing the inside of the heat exchanger cover 26 and the exhaust pipe 31, and FIG. 9 is the arrow B in FIG. 2 showing the inside of the heat exchanger cover 26 and the exhaust pipe 31. FIG. 10 is a sectional view corresponding to the view, and FIG. 10 is a view taken in the direction of arrow D in FIG.

  The bottom wall 26c of the heat exchanger cover of the present embodiment is composed of two flat left and right surfaces, and is formed by folding the steel plate in half so as to form an inverted V shape when viewed from the front (one side), and its front end Is welded to the front wall 26 b of the heat exchanger cover 26. The left and right ends of the bottom wall 26c are separated from the left and right side walls 26a, respectively, and thereby discharge holes 51 are formed on the left and right sides of the bottom wall 26c so as to communicate the heat exchanger cover 26 and the tire house 15, respectively. Yes.

  On both the left and right sides of the lower portion of the front wall 26b, guide surfaces 52 that are inclined so as to descend toward the heat exchanger 21 are formed. These guide surfaces 52 reduce the length of the left and right discharge holes 51 to the minimum opening area that can discharge dust.

  As a result, the apex P of the bottom wall 26c is located at the center of the cross-sectional outline E that forms the circular shape of the exhaust pipe 31 in a front view. Then, with the exhaust pipe 31 as a reference, one surface of the bottom wall 26c is inclined to the left and the other surface is inclined to the right, and a bottom portion corresponding to the lowermost end of the inclinations. Each discharge hole 51 is open.

  Accordingly, the dust that has passed through the mesh panel 25 and entered the heat exchanger cover 26 moves to the left or right according to the inclination of either the left or right surface forming the bottom wall 26c, and a part of the dust. The dust moves backward following the inclination of the guide surface 52 and is discharged downward from the discharge hole 51 when reaching the lowest end of the inclination.

  For this reason, although not redundantly described, all the dust that has entered the heat exchanger cover 26 can be discharged downward from the discharge hole 51 as in the first embodiment. It can be avoided in advance. Further, by suppressing the size of the discharge hole 51 to the minimum, the outside air in the tire house 15 is prevented from being sucked into the heat exchanger cover 26, and dust, mud, and an adhesion preventing agent contained in the outside air are prevented. It is possible to prevent problems caused by the above.

  As described above, the exhaust structure of the present embodiment has the same effects as those of the first embodiment. Needless to say, the exhaust hole 51 can be omitted as described in the first embodiment. Also, a flexible sheet can be used as in another example of the first embodiment, and will be briefly described below as another example.

FIG. 11 is a view taken in the direction of arrow D in FIG. 2 showing the inside of the heat exchanger cover 26 and the exhaust pipe 31 of another example.
In this other example, the lower guide surface 52 of the front wall 26b is not formed, and discharge holes 61 equal to the longitudinal length of the heat exchanger cover 26 are formed on the left and right sides of the bottom wall 26c, respectively. And the base end of flexible sheets 62, such as rubber | gum, is attached to the left end and right end of the bottom wall 26c, ie, the lowest end of an inclination direction, respectively with the volt | bolt 63, and the front-back width of the flexible sheet 62 is the discharge hole 61. The left and right lengths are the same as that of the discharge hole 61.

  As in the other example of the first embodiment, during operation of the engine 10, the flexible sheets 62 are sucked up by the negative pressure generated in the heat exchanger cover 26, and the leading ends thereof are placed on the left and right side walls 26a (inner walls). Make contact. As a result, the discharge hole 61 is closed, and the intake of outside air from inside the tire house 15 is prevented. Then, the dust that has entered the heat exchanger cover 26 at this time moves to the left or the lowermost end following the inclination of the bottom wall 26c, and then the flexible sheet 62 hangs down by stopping the engine. The discharge hole 61 is opened and dust is discharged downward. Accordingly, although not redundantly described, the same operation and effect as another example of the first embodiment can be obtained.

  This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the exhaust structure of the tire roller 1 is embodied, but the type of the rolling vehicle is not limited to this, and may be applied to, for example, a vibration roller, a Macadam roller, or the like.

  In the above embodiment, the outside air introduction port 24 is formed in the openable / closable hood 11 to introduce outside air. However, the location where the outside air introduction port 24 is provided is not limited to this. The introduction port 24 may be formed as an opening.

  In the first embodiment, the bottom wall 26c is formed so as to form an inverted V shape when viewed from the side. In the second embodiment, the bottom wall 26c is formed so as to form an inverted V shape when viewed from the front. However, the shape of the bottom wall 26c is not limited to the above as long as the apex P of the bottom wall 26c is located within the cross-sectional outline E of the exhaust pipe 31. Therefore, for example, the bottom wall 26c may be bent back and forth and left and right so as to form a quadrangular pyramid. Even in this case, if the apex P of the bottom wall 26c is located within the cross-sectional outline E of the exhaust pipe 31, The same effect as the embodiment can be obtained.

9 Engine room 10 Engine 11 Hood (body panel)
15 Tire house (downside outside)
20 Outside air introduction chamber 21 Heat exchanger 24 Outside air inlet 26 Heat exchanger cover 26a Side wall (inner wall)
26b Front wall (inner wall)
27 Fixing bracket (inner wall)
26c Bottom wall 31 Exhaust pipe 32 Exhaust through hole 36, 51, 61 Discharge hole 41, 62 Flexible sheet

Claims (5)

An outside air introduction chamber, which is defined adjacent to an engine room in which an engine of a driving power source is housed, and into which outside air is introduced through an outside air introduction port which opens above the vehicle body panel;
A heat exchanger that is disposed between the outside air introduction chamber and the engine room, and exhibits a cooling action of the engine by heat exchange with outside air flowing from the outside air introduction chamber to the engine;
An exhaust pipe that extends from the engine room through the outside air introduction chamber to the outside through an exhaust through hole formed in the bottom wall of the outside air introduction chamber and guides the engine exhaust gas to the vicinity of the road surface. Prepared,
2. A rolling compact vehicle according to claim 1, wherein a bottom wall of the outside air introduction chamber is formed to have an oblique shape with a vertex located within a cross-sectional outline of the exhaust pipe. 2. The compaction vehicle according to claim 1, wherein the bottom wall of the outside air introduction chamber has a discharge hole that communicates the outside air introduction chamber and the lower outside at a slanted hem portion. The bottom wall of the outside air introduction chamber is formed by folding a plate material in half so as to form an inverted V shape when viewed from one side, and the apex is positioned within the cross-sectional outline of the exhaust pipe on one side. The compaction vehicle according to claim 1 or 2, characterized by the above-mentioned. The outside air introduction chamber is attached to a slanted hem portion of the bottom wall of the outside air introduction chamber and hangs downward under its own weight to open the discharge hole downward and away from the inner wall of the outside air introduction chamber. When a negative pressure is generated in the outside air introduction chamber for the introduction of outside air that has passed through, a flexible sheet that is sucked up by the negative pressure and closes the discharge hole by abutting against the inner wall of the outside air introduction chamber is further provided. The compaction vehicle according to claim 2, further comprising: The outside air introduction chamber is disposed below the outside air introduction chamber so as to face the inside of the tire house, covers the lower side of the heat exchanger, and communicates with the outside air introduction chamber to form one space. A heat exchanger cover that functions as part of the
The bottom wall of the heat exchanger cover is formed so as to form an oblique shape having a vertex located within a cross-sectional outline of the exhaust pipe. Rolling compaction vehicle.

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