JP6602333B2 - Compaction vehicle - Google Patents

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. Then, 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 A pipe, a mesh panel disposed at the outside air introduction port, and a discharge hole for communicating the outside air introduction chamber and the lower outside through a bottom wall of the outside air introduction chamber, and a minimum gap between the discharge holes Dimensions before Characterized in that it is set to more than the maximum gap size of the mesh of the mesh panel.

  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 C arrow line view of FIG. 2 which looked at the heat exchanger cover of 1st Embodiment from front diagonally downward. It is the schematic which compared the maximum clearance dimension of the mesh of a mesh panel, and the minimum clearance dimension of the annular clearance by an exhaust through-hole. 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 figure which looked at the heat exchanger cover of 3rd Embodiment from the front. It is sectional drawing equivalent to A arrow of FIG. 2 which shows the inside of the heat exchanger cover of 4th Embodiment, and an exhaust pipe. It is the figure which looked at the heat exchanger cover of 4th Embodiment from the front. 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 with a driver on the vehicle as a main subject.

  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, and each mesh has a square shape with an equal size. 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 and FIG. 5 are C arrow views of FIG.

  As shown in FIGS. 2 to 5, 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 upper ends of the left and right side walls 26a and the front wall 26b of the heat exchanger cover 26 are connected to the bottom wall 20c of the outside air introduction chamber 20, and the rear end of the bottom wall 26c of the heat exchanger cover 26 is abutted against the fixing bracket 27 to form silicon. Sealer 29 is filled.

  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 focused on the size of dust such as dead leaves entering the heat exchanger cover 26. That is, since the mesh panel 25 is disposed in the outside air introduction port 24, there is no possibility that dust larger than the maximum gap size of the mesh enters the heat exchanger cover 26. On the other hand, it is not only the entire bottom wall 26 c in the heat exchanger cover 26 that needs to prevent dust accumulation, but only around the exhaust pipe 31 that may come into contact with the exhaust pipe 31. An exhaust through hole 32 into which the exhaust pipe 31 is inserted is formed in the bottom wall 26c, and an annular gap 35 (in the present invention) is formed between the inner peripheral edge of the exhaust through hole 32 and the outer peripheral surface of the exhaust pipe 31. This corresponds to a discharge hole and may be simply referred to as an annular gap hereinafter), and the inside of the heat exchanger cover 26 and the inside of the tire house 15 (downside outside) communicate with each other through the annular gap 35.

Therefore, if the minimum clearance dimension of the annular clearance 35 is set to be the same as or slightly larger than the maximum clearance dimension of the mesh of the mesh panel 25, there is a possibility that the intake pipe 31 will come into contact with the intake of outside air being minimized. It is possible to avoid a situation in which dust is discharged from the annular gap 35 to the outside outside (in the tire house 15) and the dust burns.
Based on the above knowledge, in this embodiment, the minimum clearance dimension of the annular clearance 35 by the exhaust through-hole 32 is optimally set with respect to the maximum clearance dimension of the mesh of the mesh panel 25. explain.

[First Embodiment]
FIG. 6 is a schematic diagram comparing the maximum gap size of the mesh of the mesh panel 25 and the minimum gap size of the annular gap 35 formed by the exhaust through holes 32.
The mesh panel 25 of the present embodiment is manufactured by weaving wire materials vertically and horizontally, so that each mesh has a square shape with an equal size. Therefore, the maximum gap size of the mesh can be grasped as L1 corresponding to the diagonal line of each mesh. Accordingly, dust having a size exceeding the maximum clearance dimension L1 is prevented from entering the outside air introduction chamber 20 by the mesh panel 25, and only dust having a maximum clearance dimension L1 or less passes through the mesh panel 25 and enters the outside air introduction chamber 20 or heat. It enters the exchanger cover 26.

  On the other hand, since the exhaust pipe 31 is located at the center of the exhaust through hole 32, the annular gap 35 around the exhaust pipe 31 has a uniform width in the circumferential direction. Therefore, the minimum gap dimension of the annular gap 35 can be grasped as L 2 corresponding to the width of the annular gap 35. Therefore, if the dust is less than the minimum gap dimension L2, it can be discharged downward from the annular gap 35. In addition, when the exhaust pipe 31 is located eccentrically with respect to the center of the exhaust through hole 32, a portion where the width of the annular gap 35 is the narrowest corresponds to the minimum gap dimension L2.

  In the present embodiment, as shown in FIG. 6, the minimum clearance dimension L2 of the annular clearance 35 is set slightly larger than the maximum clearance dimension L1 of the mesh (L2> L1). For this reason, with respect to the dust having the maximum gap dimension L1 or less that has passed through the mesh panel 25, the annular gap 35 can discharge the dust having a larger minimum gap dimension L2 or less. As a result, among the dust that has entered the heat exchanger cover 26, the dust that has fallen on the bottom wall 26c remains accumulated, but the dust that has reached the periphery of the essential exhaust pipe 31, that is, the exhaust pipe 31. The dust that may burn in contact with the gas is reliably discharged downward through the annular gap 35.

  In addition, the dust accumulated in the heat exchanger cover 26 may move on the bottom wall 26c and approach the exhaust pipe 31 due to the inclination or vibration of the vehicle body 2 that occurs during traveling or transportation of the vehicle 1. is there. However, even in such a case, dust is discharged downward through the annular gap 35 without contacting the exhaust pipe 31.

  Therefore, in any situation, it is possible to prevent the dust that has entered the heat exchanger cover 26 from entering the heat exchanger cover 26 together with the outside air through the outside air inlet 24, and the situation where the dust burns due to the contact with the exhaust pipe 31 can be prevented. It can be avoided.

  Further, as described above, the connection portion between the upper part of the heat exchanger cover 26 and the outside air introduction chamber 20 is sealed, and the lower part of the heat exchanger cover 26 has an annular shape with a necessary minimum size capable of discharging dust. The gap 35, more specifically, an annular gap 35 having a size capable of achieving a minimum gap dimension L2 slightly larger than the maximum gap dimension L1 of the mesh is only opened. For this reason, the outside air in the tire house 15 sucked into the heat exchanger cover 26 through the annular gap 35 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.

[Second Embodiment]
Next, a second embodiment will be described. The difference from the first embodiment is in the shape of the bottom wall 26c of the heat exchanger cover 26 and the shape of the annular gap 35, and other configurations are the same as those in the first embodiment. Therefore, the description of the overlapping part is omitted, and the differences are mainly described.

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 the second embodiment, and FIG. 8 is the inside of the heat exchanger cover 26 and the exhaust of the second embodiment. FIG. 3 is a cross-sectional view corresponding to an arrow B in FIG.
The bottom wall 26c of the heat exchanger cover 26 of this embodiment is formed so as to be inclined toward the heat exchanger 21 side, and its rear end is abutted against the fixing bracket 27 and filled with the silicon sealer 29.

  Further, the exhaust through-hole 32 of the present embodiment has a semicircular shape in a region in front of the vehicle, and extends to the lowermost end in the inclination direction of the bottom wall 26c while maintaining a lateral width corresponding to the inner diameter thereof. As a result, the annular gap 35 is the same as that of the first embodiment in that it surrounds the periphery of the exhaust pipe 31 with a uniform width in the circumferential direction. However, the heat exchanger cover 26 is provided on the heat exchanger 21 side. It has a wide area which connects the inside and the inside of the lower tire house 15. The width of the annular gap 35 surrounding the periphery of the exhaust pipe 31 is set to the same dimension as that of the first embodiment, and this width corresponds to the minimum gap dimension L 2 of the annular gap 35.

Accordingly, as in the first embodiment, the minimum clearance dimension L2 of the annular clearance 35 is set slightly larger than the maximum clearance dimension L1 of the mesh, and therefore enters the heat exchanger cover 26 and around the exhaust pipe 31. The reached dust is reliably discharged downward through the annular gap 35.
In addition, due to the inclination provided on the bottom wall 26c, the dust that has entered the heat exchanger cover 26 moves to the lowest end of the bottom wall 26c along the inclination. That is, it is kept away from the exhaust pipe 31 and is held at the lowermost end of the bottom wall 26c. Is done. Further, since the annular gap 35 is extended to the heat exchanger 21 side, a part of the dust is discharged downward through the extended portion of the annular gap 35 in the process of moving to the lowest end.

  Due to the above factors, according to the present embodiment, it is possible to more reliably prevent the dust that has entered the heat exchanger cover 26 from coming into contact with the exhaust pipe 31 as compared with the first embodiment. It is possible to avoid the situation where garbage burns. In addition, since the opening area of the annular gap 35 is slightly increased as compared with the first embodiment, the outside air from the tire house 15 containing the dust, mud, adhesion preventing agent and the like into the heat exchanger cover 26 can be obtained. Suction can be kept to a minimum.

  Further, since the exhaust through hole 32 formed in the bottom wall 26c has a shape opened to the heat exchanger 21 side, in the assembly work of the vehicle body 2, the exhaust pipe 31 is first fixed to the vehicle body 2 before the heat The exchanger cover 26 can be attached to the fixed bracket 27 of the heat exchanger 21, and the effect that the assembling work can be facilitated is also obtained.

  Further, since the left and right front rolling tires 3f are displaced in the front-rear direction in accordance with steering about the turning bearing 18, the front rolling tire 3f is disposed on the heat exchanger cover 26 disposed immediately thereafter. There is a case where a shape that avoids interference with the is required. The inclination of the bottom wall 26c of this embodiment contributes not only to the discharge of dust but also to the prevention of interference with the front rolling tire 3f as shown in FIG. For example, as shown in FIG. 12, the heat exchanger cover 101 of the prior art needs to be formed into a complicated shape in which both the left and right sides are cut out in a triangular shape. On the other hand, the heat exchanger cover 26 according to this embodiment is used. Is a simple shape in which the bottom wall 26c is inclined in one direction. For this reason, manufacture of the heat exchanger cover 26 becomes easy and can be implemented at low cost.

[Third Embodiment]
Next, a third embodiment will be described. The difference from the second embodiment is that the bottom wall 26c is also inclined in the left-right direction, and other configurations are the same as those of the second embodiment. Therefore, the description of the overlapping part is omitted, and the differences are mainly described.
FIG. 9 is a front view of the heat exchanger cover 26 according to the third embodiment.

The bottom wall 26c of the heat exchanger cover 26 of the present embodiment is composed of two surfaces divided into left and right sides, and is inclined so as to descend to the heat exchanger 21 side, respectively, and from the left and right sides in the left and right direction orthogonal to the inclination direction. It is formed so as to be inclined downward toward the annular gap 35 side. The shape of the annular gap 35 is the same as in the second embodiment.
In the present embodiment, due to the inclination provided on the bottom wall 26c, the dust that has entered the heat exchanger cover 26 moves to the annular gap 35 side along the inclination and is discharged downward. Therefore, almost no dust is deposited on the bottom wall 26c, so that it is possible to more reliably prevent dust from contacting the exhaust pipe 31 as compared with the second embodiment.

[Fourth Embodiment]
Next, a fourth embodiment will be described.
In the first to third embodiments, dust is discharged through the annular gap 35 of the bottom wall 26c of the heat exchanger cover 26. In this embodiment, the rear end of the bottom wall 26c and the fixing bracket 27 of the heat exchanger 21 The point is that dust is discharged through a belt-like gap 41 (corresponding to the discharge hole of the present invention) formed between the two. Since the basic configuration is the same as that of the exhaust structure of the second embodiment, the description of the overlapping parts is omitted, and the differences will be mainly described.

10 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 the fourth embodiment, and FIG. 11 is a front view of the heat exchanger cover 26 of the fourth embodiment. It is a figure.
The bottom wall 26c of the heat exchanger cover 26 is formed so as to be inclined toward the heat exchanger 21 side. In the present embodiment, the annular gap 35 is not formed in the bottom wall 26c, and the inner peripheral edge of the exhaust through hole 32 and the outer peripheral surface of the exhaust pipe 31 are directly connected by welding or the like.

  A belt-like gap 41 is formed between the rear end of the bottom wall 26c and the fixed bracket 27 of the heat exchanger 21 so as to extend to the entire left and right sides of the heat exchanger cover 26. A base end of a flexible sheet 42 made of rubber or the like is attached to the lowermost end with a bolt 43. The left-right width of the flexible sheet 42 is the same as that of the belt-like gap 41, and the longitudinal length is set longer than that of the belt-like gap 41.

  When no negative pressure is generated in the heat exchanger cover 26 due to the engine being stopped, the flexible sheet 42 hangs down by its own weight and separates the tip from the fixed bracket 27 of the heat exchanger 21, thereby forming a belt-like gap as a discharge hole. 41 is opened toward the lower tire house 15. The longitudinal length of the belt-like gap 41 thus opened (the distance between the fixing bracket 27 and the tip of the flexible sheet 42) corresponds to the minimum gap dimension L2, which is larger than the maximum gap dimension L1 of the mesh of the mesh panel 25. Is also set slightly larger.

  Then, when the engine 10 is operated and a negative pressure is generated in the heat exchanger cover 26, the flexible sheet 42 is sucked up by the negative pressure and the tip is brought into contact with the fixed bracket 27. As a result, the belt-like gap 41 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 on the vehicle body upper side 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 have a size that is less than or equal to the maximum gap dimension L1 that has passed through the mesh panel 25, and move to the lowermost end following the inclination of the bottom wall 26c.

  When the flexible sheet 42 hangs down when the engine is stopped, the belt-like gap 41 opens with the minimum gap dimension L2 (longitudinal length), and the dust is discharged downward through the belt-like gap 41. As a result, the accumulation of dust on the bottom wall 26c is almost eliminated, so that it is possible to more reliably prevent the dust from contacting the exhaust pipe 31 as compared with the second embodiment, for example.

  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 above embodiment, the minimum clearance dimension L2 of the annular clearance 35 is set slightly larger than the maximum clearance dimension L1 of the mesh, but the present invention is not limited to this. In order to obtain the same effect as that of the above embodiment, the minimum gap dimension L2 may be set to be equal to or larger than the maximum gap dimension L1.

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 introduction port 25 Mesh panel 26 Heat exchanger cover 26c Bottom wall 31 Exhaust pipe 32 Exhaust through hole 35 Annular gap (exhaust hole)
41 Band gap (discharge hole)
42 Flexible sheet

Claims (6)

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 extending from the engine room to the outside through the exhaust air through hole formed in the bottom wall of the outside air introduction chamber via the outside air introduction chamber, and guiding the exhaust gas of the engine to the vicinity of the road surface;
A mesh panel disposed at the outside air inlet;
A discharge hole communicating the outside air introduction chamber and the lower outside through the bottom wall of the outside air introduction chamber;
A rolling compaction vehicle, wherein a minimum clearance dimension of the discharge hole is set to be equal to or larger than a maximum clearance dimension of the mesh of the mesh panel. 2. The compaction vehicle according to claim 1, wherein the discharge hole is an annular gap formed between an inner peripheral edge of the exhaust through hole and an outer peripheral surface of the exhaust pipe. The bottom wall of the outside air introduction chamber is formed so as to be inclined toward the heat exchanger side,
3. The compaction vehicle according to claim 2, wherein the annular gap extends to a lowermost end in a tilt direction of a bottom wall of the outside air introduction chamber. The bottom wall of the outside air introduction chamber is formed to be inclined so as to descend from both sides to the annular gap side in a direction orthogonal to the direction of inclination to the heat exchanger side. The compaction vehicle described in 1. The bottom wall of the outside air introduction chamber is formed to be inclined so as to descend toward the heat exchanger side, and the lowermost end in the inclination direction is separated from the heat exchanger side to form a band-shaped gap,
The bottom wall is attached to the lowermost end in the inclination direction, hangs down under its own weight, and is spaced apart from the heat exchanger side to open the strip-shaped gap as the discharge hole toward the outside, while the outside air introduction port is When a negative pressure is generated in the outside air introduction chamber for the introduction of the outside air, a flexible sheet is further provided that is sucked up by the negative pressure and closes the belt-shaped gap by contact with the heat exchanger side. The compaction vehicle according to claim 1. 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 compaction vehicle according to any one of claims 1 to 5, wherein the discharge hole is provided in a bottom wall of the heat exchanger cover.

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