JP2013203141A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine configured to remove trash such as dead leaves having entered between an exhaust pipe and an exhaust pipe cover without disassembling the exhaust pipe cover.SOLUTION: A mini-shovel machine includes: a rotating body; a working apparatus mounted on the rotating body; a muffler arranged in the rotating body to guide exhaust gas of an engine; an exhaust pipe 13 having an exhaust port 13a for emitting the exhaust gas exhausted from the muffler, at a position above the rotating body; and an exhaust pipe cover 21, which is disposed on the rotating body to surround a periphery of the exhaust pipe 13 while leaving a clearance 13b with the exhaust pipe 13, and prevents contact with the exhaust pipe 13. First and second notch parts 21A2, 21B2 are formed in a lower end part of the exhaust pipe cover 21 for forming an opening 30 that allows insertion of a cleaning tool such as a brush.

Description

  The present invention relates to a working machine such as a mini excavator provided with an exhaust pipe cover disposed with a gap between the exhaust pipe so as to surround a peripheral surface of the exhaust pipe that discharges engine exhaust gas at an upper position of the vehicle body. About.

  There exists a thing shown by patent document 1 as this kind of prior art. This prior art is an agricultural machine, and this agricultural machine has a bonnet, that is, a muffler through which engine exhaust gas is guided in a vehicle body, and has an exhaust port through which the exhaust gas guided to this muffler is discharged at an upper position of the vehicle body. And an exhaust pipe that is erected and held on the muffler. In addition, a cover cylinder, that is, an exhaust pipe cover, is provided so as to surround the exhaust pipe with a gap between the exhaust pipe and the upper surface, and the lower end portion of the exhaust pipe cover has an exhaust pipe. Is integrally provided at the lower end portion of each of the two.

Japanese Utility Model Publication No. 61-26583

  The above-described prior art disclosed in Patent Document 1 has a problem in cleaning and removing dust when dust such as dead leaves enters the gap between the cover cylinder and the exhaust pipe. That is, at the time of cleaning such dust, in order to realize the cleaning of the dust, a complicated disassembly work for removing the cover cylinder integrated with the exhaust pipe from the exhaust pipe is necessary, which is a large-scale cleaning work. .

  In recent years, working machines such as mini excavators have been developed with exhaust gas treatment devices, but the exhaust gas temperature of work machines without exhaust gas treatment devices is about 300 ° C. However, it is known that the temperature of the exhaust gas rises to about 600 ° C. due to the high heat generated by the combustion of NOx and PM (particulate matter) during the exhaust gas treatment. Therefore, the exhaust pipe that discharges the exhaust gas is likely to be heated to a high temperature, and when dust such as dead leaves comes into contact with such a high-temperature exhaust pipe, the dust is likely to burn. Therefore, as described above, a gap is formed between the exhaust pipe and the cover cylinder, that is, the exhaust pipe cover, and the exhaust gas processing apparatus has a structure in which dust such as dead leaves may enter the gap. In the working machine equipped with, cleaning of the dust that has entered the gap becomes a particularly important problem.

  The present invention has been made from the above-described prior art, and its purpose is to clean and remove dust such as dead leaves that have entered between the exhaust pipe and the exhaust pipe cover without disassembling the exhaust pipe cover. An object of the present invention is to provide a working machine that can perform the above.

  In order to achieve this object, the present invention provides a vehicle body, a working device attached to the vehicle body, a muffler arranged in the vehicle body, through which exhaust gas from the engine is guided, and exhaust gas discharged from the muffler. An exhaust pipe having an exhaust port for discharging at an upper position of the vehicle body and an exhaust pipe disposed on the vehicle body with a gap between the exhaust pipe and surrounding the exhaust pipe to prevent contact with the exhaust pipe A working machine including a cover is characterized in that a cutout portion for forming an opening allowing the insertion of the cleaning tool is formed at the lower end portion of the exhaust pipe cover.

  The present invention configured as described above disassembles the exhaust pipe cover when dust such as dead leaves enters from the gap between the exhaust pipe and the exhaust pipe cover and accumulates near the lower end of the exhaust pipe and the exhaust pipe cover. Without removing the dust, a cleaning tool such as a brush can be inserted into the opening formed by the notch formed in the lower end portion of the exhaust pipe cover, and the dust can be easily removed.

  According to the present invention, the vehicle body includes a revolving body, a driver seat is disposed on the revolving body, the revolving body includes a counterweight disposed behind the driver seat, the exhaust pipe and the exhaust pipe cover. The exhaust pipe cover is arranged so that the opening is positioned only on the driver's seat side.

  In the present invention configured as described above, since the opening formed by the cutout portion of the exhaust pipe cover is located only on the driver's seat side, the opening is concealed on the driver's seat side. Contact to the exhaust pipe heated by the gas can be prevented. Further, according to the present invention, even when dust enters the gap portion that is formed near the exhaust pipe and the exhaust pipe cover and is formed on the driver's seat side and communicates with the opening portion described above, the dust in the gap portion is collected in the opening portion. Along with trash, it can be removed with a cleaning tool.

  Further, the present invention provides the first divided cover according to the above-mentioned invention, wherein the exhaust pipe cover extends along the extending direction of the exhaust pipe, and is opposed to each other with a gap so as to sandwich the exhaust pipe. A cutout portion is formed at a lower end portion of the first divided cover portion and a lower end portion of the second divided cover portion. It consists of a 2nd notch part.

  The present invention configured as described above can dissipate heat of the exhaust pipe due to the exhaust gas from the gap formed between the first divided cover part and the second divided cover part. It is possible to prevent the exhaust pipe cover from being heated and the exhaust pipe cover from being heated. Also, dust such as dead leaves entering the gap between the first divided cover portion and the second divided cover portion and accumulated near the lower end of the exhaust pipe and the exhaust pipe cover is inserted into the opening with a cleaning tool such as a brush. Can be easily removed by cleaning.

  Further, the present invention is characterized in that, in the above invention, the first divided cover portion and the second divided cover portion have attachment portions attached to the upper surface of the counterweight at respective lower ends.

  In the present invention configured as above, the exhaust pipe cover including the first divided cover portion and the second divided cover portion can be stably erected and held by attaching the attachment portion to the upper surface of the counterweight.

  In the present invention, since a notch for forming an opening that allows insertion of the cleaning tool is formed in the lower end portion of the exhaust pipe cover, dead leaves that have entered the gap between the exhaust pipe and the exhaust pipe cover The dust can be easily removed by inserting a cleaning tool such as a brush into the opening formed by the notch without disassembling the exhaust pipe cover as in the prior art. Thereby, the cleaning operation of the dust collected at the lower end portion of the exhaust pipe cover can be performed more efficiently than in the past. Therefore, the present invention is also suitable as a work machine equipped with an exhaust gas treatment device, in which the temperature of the exhaust gas tends to be high, and it is desired to prevent dust such as dead leaves from contacting the exhaust pipe. Furthermore, the present invention is also suitable as a mini excavator that is often used in a work environment that tends to generate garbage such as dead leaves, such as in a town.

It is a side view which shows the vehicle body of the mini excavator which comprises 1st Embodiment of the working machine which concerns on this invention. It is a rear view of the vehicle body with which the mini excavator shown in FIG. 1 is equipped. It is the perspective view which looked at the vehicle body of the mini excavator shown in FIG. 1 from diagonally forward. It is a top view of the vehicle body of the mini excavator shown in FIG. It is a figure which shows the positional relationship of the operator who sat in the driver | operator seat of the mini shovel shown in FIG. 1, a rear left support | pillar, and an exhaust pipe, (a) A figure is a rear view, (b) A figure is a top view. It is a figure explaining the height position of the exhaust port of the exhaust pipe with which 1st Embodiment is equipped. It is a figure which shows the exhaust pipe and exhaust pipe cover with which 1st Embodiment is equipped, (a) A figure is a front view, (b) A figure is a top view, (c) A figure is a perspective view seen from the front side, (d) The figure is a perspective view seen from the back side. It is a figure which shows the exhaust pipe and exhaust pipe cover with which 1st Embodiment is equipped, (a) A figure is a rear view, (b) A figure is BB sectional drawing of (a) figure, (c) A figure is (a). CC sectional drawing of a figure, (d) figure is AA sectional drawing of (a) figure, (e) figure is a side view. It is an expansion perspective view which shows each upper part of the exhaust pipe and exhaust pipe cover with which 1st Embodiment is equipped. 1A and 1B are views showing a cover holding portion provided in the first embodiment, wherein FIG. 1A is an exploded perspective view of the cover holding portion, and FIG. 2B is a perspective view showing a state where the cover holding portion is attached to an exhaust pipe. FIG. It is a figure which shows the cover holding part with which 1st Embodiment is equipped, (a) A figure is an expanded perspective view which shows the state which attached the cover holding part to the exhaust pipe, (b) The figure attached the cover holding part to the exhaust pipe. It is an enlarged plan view which shows a state. It is a disassembled perspective view which shows the attachment relation of the exhaust pipe and exhaust pipe cover with which 1st Embodiment is equipped. It is principal part sectional drawing which shows the arrangement | positioning relationship of the tail pipe and exhaust pipe with which 1st Embodiment is equipped. It is a side view which shows the vehicle body of the mini excavator which comprises 2nd Embodiment of the working machine which concerns on this invention. It is a rear view of the vehicle body of the mini excavator shown in FIG. It is a top view of the vehicle body of the mini excavator shown in FIG. It is a top view which shows the state which remove | excluded the roof of the cab from the vehicle body of the mini excavator shown in FIG. It is the perspective view which looked at the vehicle body of the mini excavator shown in FIG. 14 from diagonally forward. It is a figure which shows the exhaust pipe and exhaust pipe cover with which 2nd Embodiment is equipped, (a) A figure is a front view, (b) A figure is a top view, (c) A figure is a perspective view seen from the front side, (d) The figure is a perspective view seen from the back side. It is a figure which shows the exhaust pipe and exhaust pipe cover with which 2nd Embodiment is equipped, (a) A figure is a rear view, (b) A figure is AA sectional drawing of (a) figure, (c) A figure is (a). BB sectional drawing of a figure, (d) figure is CC sectional drawing of (a) figure, (e) figure is a side view. It is a principal part top view which shows the arrangement | positioning relationship of the tail pipe and exhaust pipe with which 2nd Embodiment is equipped.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a work machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a vehicle body of a mini excavator constituting a first embodiment of a working machine according to the present invention, FIG. 2 is a rear view of the vehicle body provided in the mini excavator shown in FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is a plan view of the mini excavator body shown in FIG. 1, FIG. 5 is an operator sitting on the driver seat of the mini excavator shown in FIG. FIG. 4 is a diagram showing the positional relationship between the exhaust pipe and the exhaust pipe, in which FIG.

  As shown in FIGS. 1-4, the working machine which concerns on 1st Embodiment consists of a mini excavator, for example. The first embodiment includes a traveling body 1, a revolving body 2 disposed on the traveling body 1, and a work device (not shown) supported by a support portion 16 disposed on the front side of the revolving body 2. ing. The working device includes a boom, an arm, a bucket, and the like, and can perform earth and sand excavation work and the like. The traveling body 1 and the revolving body 2 described above constitute a vehicle body.

  A driver's seat 3 is disposed on the revolving frame 2 a of the revolving structure 2, and a canopy 4 is provided so as to cover the driver's seat 3. The canopy 4 is made of a canopy having four pillars, for example. That is, the canopy 4 includes a front right column 5a, a front left column 5b, a rear right column 5c, and a rear left column 5d. In addition, the canopy 4 includes a roof 6 that is disposed above the support columns 5 a to 5 d and covers the driver's seat 3.

  A counterweight 7 that secures a weight balance is provided at a portion of the revolving structure 2 located on the rear side of the driver's seat 3. The counterweight 7 is provided with an exhaust pipe 13 having an exhaust port 13 a for discharging engine exhaust gas at a position above the counterweight 7. Further, an exhaust pipe cover 21 that is disposed so as to surround the peripheral surface of the exhaust pipe 13 and prevents contact with the exhaust pipe 13 is provided.

  In the first embodiment, as shown in FIG. 4, the exhaust pipe 13 and the position near the virtual straight line 18 connecting the ship point of the driver's seat 3, that is, the seat reference point 17, and, for example, the rear left column 5d. An exhaust pipe cover 21 is disposed. Thus, as shown in FIG. 5, when the operator 22 is seated on the driver's seat 3, the exhaust pipe 13 and the exhaust pipe cover 21 are positioned behind the operator.

  FIG. 6 is a view for explaining the height position of the exhaust port of the exhaust pipe provided in the first embodiment.

  The mini excavator according to the first embodiment has a height dimension of the exhaust pipe 13, a height dimension 6a1 of the uppermost part 6a of the roof 6 of the canopy 4 and a lowermost part 6b as shown in FIG. The height dimension is set so as to be included in the height region 23 between the height dimension 6b1. The exhaust pipe 13 is arranged so that the direction of the exhaust port 13a of the exhaust pipe 13 is directed rearward, for example. The height dimension from the ground where the mini excavator is installed to the exhaust port 13a of the exhaust pipe 13 is set to a height dimension higher than the average height of an adult, for example, a height dimension of 170 cm or more.

  7A and 7B are views showing an exhaust pipe and an exhaust pipe cover provided in the first embodiment. FIG. 7A is a front view, FIG. 7B is a plan view, and FIG. 7C is a perspective view seen from the front side. (D) The figure is a perspective view seen from the back side, FIG. 8 is a figure which shows the exhaust pipe and exhaust pipe cover with which 1st Embodiment is equipped, (a) A figure is a rear view, (b) A figure is (a). FIG. 4B is a cross-sectional view taken along the line B-B of FIG. 4A, FIG. 5C is a cross-sectional view taken along the line C-C of FIG.

  As shown in FIGS. 7 and 8, the lower end of the exhaust pipe 13 has a hole communicating with the cylindrical portion of the exhaust pipe 13 and is integrally provided with a flange 19 fixed to the upper surface of the counterweight 7. It is. The flange 19 is fixed to the upper surface of the counterweight 7 by a bolt 15.

  In the first embodiment, a cutout portion is provided in the lower end portion of the exhaust pipe cover 21 to form an opening 30 that allows insertion of a cleaning tool such as a brush (not shown). As shown in FIG. 1, the exhaust pipe cover 21 is arranged so that the opening 30 is located only on the driver's seat 3 side, for example. The exhaust pipe cover 21 is disposed with a gap 13 b between the exhaust pipe 13 and the exhaust pipe 13.

  As shown in FIGS. 7 and 8, the exhaust pipe cover 21 extends along the extending direction of the exhaust pipe 13 and is disposed opposite to each other with a gap 21 </ b> C so as to sandwich the exhaust pipe 13. It includes a first divided cover portion 21A and a second divided cover portion 21B. In addition, the above-described cutout portion includes a first cutout portion 21A2 formed at the lower end portion of the first divided cover portion 21A, and a second cutout portion 21B2 formed at the lower end portion of the second divided cover portion 21B. Consists of. 21 A of 1st division | segmentation cover parts and the 2nd division | segmentation cover part 21B are provided with the flat 1st attachment part 21A3 and 2nd attachment part 21B3 which are attached to the upper surface of the counterweight 7 in each lower end. These mounting portions 21A3 and 21B3 are fastened together with the flange 19 of the exhaust pipe 13 by the bolt 15 described above and fixed to the counterweight 7. A large number of slits 21A1 are formed on the side surface of the first divided cover portion 21A. Similarly, a large number of slits are also formed on the side surface of the second divided cover portion 21B.

  FIG. 9 is an enlarged perspective view showing an upper part of each of the exhaust pipe and exhaust pipe cover provided in the first embodiment, FIG. 10 is a view showing a cover holding portion provided in the first embodiment, and FIG. FIG. 11B is an exploded perspective view of the holding portion, FIG. 11B is a perspective view of the cover holding portion attached to the exhaust pipe, and FIG. 11 is a view of the cover holding portion provided in the first embodiment. FIG. 12A is an enlarged perspective view showing a state where the cover holding portion is attached to the exhaust pipe, FIG. 12B is an enlarged plan view showing a state where the cover holding portion is attached to the exhaust pipe, and FIG. 12 is provided for the first embodiment. It is a disassembled perspective view which shows the attachment relationship of the exhaust pipe and exhaust pipe cover.

  As shown in FIGS. 9 to 12, the first embodiment includes a cover holding portion 24 that holds the exhaust pipe cover 21 on the exhaust pipe 13. As shown in FIG. 11B, the cover holding portion 24 includes an annular member 24a disposed with a gap 13b between the exhaust pipe 13 and the annular member 24 so as to surround the peripheral surface of the exhaust pipe 13. A support member, which will be described later, that supports 24a and is fixed to the periphery of the exhaust pipe 13 by, for example, welding, a standing member that is fixed to the annular member 24a by, for example, welding and extends in the vertical direction, and the standing member And an attaching means for attaching the exhaust pipe cover 21. For example, the annular member 24a is welded to the support member.

  The support member described above includes a pair of support members 24b and 24c arranged so as to face each other with the exhaust pipe 13 therebetween. The above-mentioned standing members are arranged so as to face each other with the exhaust pipe 13 in between, and a pair of bent parts that are attached to the first divided cover part 21A or the second divided cover part 21B of the exhaust pipe cover 21 are bent. It consists of standing members 24d and 24e.

  As shown in FIG. 10B and FIG. 12, the pair of support members 24 c and 24 d are disposed, for example, in the upper part of the exhaust pipe 13. The lower portions of the pair of standing members 24d and 24e are fixed to the annular member 24a supported by the support members 24c and 24d, for example, by welding.

  Mounting members 24f and 24g formed with female threads are fixed to the upper portions of the standing members 24d and 24e, respectively, and the corresponding bolts 25 shown in FIG. 9 are attached to the female threads of the mounting members 24f and 24g. Each of the first divided cover portion 21A and the second divided cover portion 21B is held in the exhaust pipe 13 by being screwed and fastened. The attachment members 24f and 24g and the bolts 25 described above constitute attachment means for attaching the first divided cover portion 21A and the second divided cover portion 21B included in the exhaust pipe cover 21 to the standing members 24d and 24e.

  As shown in FIG. 11B, the pair of support members 24b and 24c and the pair of standing members 24d and 24e are arranged so as to be orthogonal to each other in plan view. Further, one cover holding portion 24 having the above-described configuration is provided, and the upper portions of the first divided cover portion 21A and the second divided cover portion 21B are held by the cover holding portion 24 as described above, and the first division The lower end portions of the cover portion 21A and the second divided cover portion 21B, that is, the first and second attachment portions 21A3 and 21B3 are fixed to the counterweight 7 as described above.

  As shown in FIG. 12, the upper surface 7b of the counterweight 7 is formed with a hole 7C through which engine exhaust gas is guided, and a plurality of bolt holes 7b1 are formed around the hole 7C. The hole 19a formed in the flange 19 of the exhaust pipe 13 and the hole formed in the first mounting portion 21A3 of the first divided cover portion 21A are adapted to the bolt hole 7b1 of the upper surface 7b of the counterweight 7, and the exhaust pipe The hole 19a formed in the flange 19 of the 13th hole and the hole formed in the second mounting portion 21B3 of the second divided cover portion 21B are matched with the other bolt holes 7b1 on the upper surface of the counterweight 7 and The first divided cover portion 21A, the second divided cover portion 21B, and the exhaust pipe 13 are fastened, and the first divided cover portion 21A, the second divided cover portion 21B, and the exhaust pipe 13 are illustrated on the counterweight 7. As shown in FIG. 1, it is fixed in a self-supporting state so as not to contact the canopy 4 and is held upright.

  FIG. 13 is a cross-sectional view of the main part showing the positional relationship between the tail pipe and the exhaust pipe provided in the first embodiment.

  On the revolving frame 2a of the revolving structure 2 described above, a muffler 10 that silences the exhaust gas of an engine (not shown) and a tail pipe 11 that guides the exhaust gas discharged from the muffler 10 are disposed. For example, the counterweight 7 is formed with a passage 7a communicating with the hole 7c of the counterweight 7 shown in FIG. The tail pipe 11 is inserted into the passage 7a so as not to come into contact with the wall surface of the counterweight 7 forming the passage 7a, and the upper end 11a thereof is inserted into the exhaust pipe 13.

  In the first embodiment configured as described above, the exhaust gas of the engine is guided to the exhaust pipe 13 through the muffler 10 and the tail pipe 11, and the exhaust port 13 a of the exhaust pipe 13 is externally disposed above the counterweight 7. Released.

  Further, according to the first embodiment, the opening 30 that allows insertion of a cleaning tool such as a brush is formed in the lower end portions of the first and second divided cover portions 21A and 21B included in the exhaust pipe cover 21. Since the first and second cutout portions 21A2 and 21B2 are formed, dust such as dead leaves enters through the gaps 13b and 53b between the exhaust pipe 13 and the first and second divided cover portions 21A and 21B. When the first and second divided cover portions 21A and 21B collect in the vicinity of the lower ends thereof, the first and second divided cover portions 21A and 21B are not disassembled without disassembling the first and second divided cover portions 21A and 21B. A cleaning tool such as a brush can be inserted into the opening 30 formed by the first and second cutout portions 21A2 and 21B2 formed at the lower end portion of the lens, and the dust can be easily removed by cleaning. Thereby, the cleaning operation | work of the dust collected on the lower end part of the 1st, 2nd division | segmentation cover parts 21A and 21B can be performed efficiently. Therefore, this first embodiment is a mini excavator that is provided with an exhaust gas treatment device as described above, and the temperature of the exhaust gas is likely to be high, and that it is particularly desired to prevent contact of dust such as dead leaves with the exhaust pipe 13. Is also suitable. Furthermore, the first embodiment is suitable for a mini excavator that is often used in a work environment such as a town where dust such as dead leaves is likely to be generated.

  Further, according to the first embodiment, the opening 30 formed by the first and second cutout portions 21A2 and 21B2 of the first and second divided cover portions 21A and 21B is located only on the driver's seat 3 side. As described above, since the first and second divided cover portions 21A and 21B are arranged, the opening portion 30 is hidden on the driver's seat 3 side, and contact with the exhaust pipe 13 heated thereby is made. Can be prevented. In addition, the first embodiment is formed in the vicinity of the exhaust pipe 13 and the first and second divided cover portions 21 </ b> A and 21 </ b> B on the driver's seat 3 side and communicates with the opening 30, that is, the driver's seat 3. Even if dust enters the gap formed between the first and second divided cover portions 21A and 21B, the dust in the gap together with the dust collected in the opening 30 can be It can be removed with a cleaning tool.

  Moreover, according to this 1st Embodiment, since the heat | fever of the exhaust pipe 13 by exhaust gas can be dissipated from the clearance gap 21C formed between 21A of 1st division | segmentation cover parts and the 2nd division | segmentation cover part 21B. It is possible to prevent the heat of the exhaust pipe 13 from being trapped between the exhaust pipe 13 and the first and second divided cover portions 21A and 21B and heating the first and second divided cover portions 21A and 21B. In addition, dust such as dead leaves that have entered from the gap 21C between the first and second divided cover portions 21A and 21B and accumulated near the lower ends of the exhaust pipe 13 and the first and second divided cover portions 21A and 21B are also open. It can be easily removed by inserting a cleaning tool such as a brush into 30.

  Further, by attaching the first and second attachment portions 21A3 and 21B3 to the upper surface 7b of the counterweight 7, the exhaust pipe cover 21 including the first divided cover portion 21A and the second divided cover portion 21B is stably erected. Can be retained.

  In addition, according to the first embodiment, as shown in FIGS. 4 and 5, when the operator 22 sitting on the driver's seat 3 tries to visually confirm the rear, the seat reference point 17 of the driver's seat 3 and the driving The exhaust pipe 13 is completely or substantially completely hidden behind the rear left column 5d located on a virtual straight line 18 connecting the rear left column 5d standing on the rear side of the seat 3. Become. Therefore, although the operator 22 sitting in the driver's seat 3 is blocked from view by the rear left column 5d, the view is not blocked by the exhaust pipe 13, and the workability of the work performed by the mini excavator is improved. be able to. Moreover, since this 1st Embodiment can ensure a favorable back view, it can ensure the safety | security with respect to the structure and person which exist behind the said mini excavator.

  Further, according to the first embodiment, the exhaust pipe 13 is heated by the exhaust gas being guided, but the rear left support column in which the radiant heat from the surface of the exhaust pipe 13 is erected behind the driver's seat 3. Blocked by 5d. Thereby, it is possible to prevent the operator 22 seated in the driver's seat 3 from being given unpleasant warmth due to the heat of the exhaust gas. Therefore, in the working machine provided with the above-described exhaust gas processing device in which the temperature of the exhaust gas tends to be high, the surface temperature of the exhaust pipe 13 tends to be high. As described above, the first embodiment is also suitable as a mini excavator in which the surface temperature of the exhaust pipe 13 is increased and the radiant heat described above is increased.

  In the first embodiment, the supporting members 24b and 24c fixed to the peripheral surface of the exhaust pipe 13, the annular member 24a supported by the supporting members 24b and 24c, and the annular member 24a are fixed. The first and second divided cover portions include the standing members 24d and 24e, and the mounting members 24f and 24g and the bolts 25 for attaching the first and second divided cover portions 21A and 21B to the standing members 24d and 24e. 21A and 21B can be stably held.

  In the first embodiment, the heat of the exhaust pipe 13 heated by the exhaust gas is transmitted to the support members 24b and 24c fixed to the peripheral surface of the exhaust pipe 13, and exhausted from these support members 24b and 24c. The first member is transmitted to an annular member 24a disposed with a gap 13b between the pipe 13 and is fixed to the annular member 24a from the annular member 24a and attached to standing members 24d and 24e extending in the vertical direction. , Transmitted to the second divided cover portions 21A, 21B. Therefore, the heat transferred from the exhaust pipe 13 to the support members 24b and 24c is cooled mainly at the portion of the annular member 24a located between the support members 24b and 24c and the standing members 24d and 24e. The portions of the standing members 24d and 24e attached to the member 24a and the portions of the standing members 24d and 24e to which the first and second divided cover portions 21A and 21B are attached and the bolts are provided. After being cooled, the upright members 24d and 24e are transmitted to the first and second divided cover portions 21A and 21B via the mounting members 24f and 24g and the bolts 25.

  Thus, according to the first embodiment, a heat insulating material or a long body disposed so as to surround the exhaust pipe 13 with heat transmitted from the exhaust pipe 13 to the first and second divided cover portions 21A and 21B. It can be lowered without requiring a cylindrical member to be formed. Therefore, safety when contacting the first and second divided cover portions 21A and 21B provided in the first embodiment is ensured. Moreover, this 1st Embodiment does not require a heat insulating material and the cylindrical member which forms a elongate body, but is 1st via the annular member 24a arrange | positioned with the clearance gap 13b between the exhaust pipes 13. The second divided cover portions 21A and 21B can be held in the exhaust pipe 13. Thereby, this 1st Embodiment can implement | achieve the exhaust pipe cover holding structure with a simple structure, and can reduce manufacturing cost.

  In the first embodiment, the first divided cover portion 21A included in the exhaust pipe cover 21 is supported by a pair of support members 24b and 24c fixed to the exhaust pipe 13 and these support members 24b and 24c. It can be attached to the exhaust pipe 13 via an annular member 24a and a standing member 24d of a pair of standing members 24d and 24e fixed to the annular member 24a. Further, the second divided cover portion 21B has a pair of support members 24b and 24c fixed to the exhaust pipe 13, an annular member 24a supported by the support members 24b and 24c, and an upright structure fixed to the annular member 24a. It can be attached to the exhaust pipe 13 via the member 24e. Further, since each of the pair of standing members 24d and 24c is bent, a relatively large strength can be secured. Accordingly, the first cover portion 21A and the second cover portion 21B included in the exhaust pipe cover 21 can be stably erected and held on the exhaust pipe 13.

  In the first embodiment, a gap 21C is formed between the first divided cover portion 21A and the second divided cover portion 21B facing each other, and the first and second divided cover portions 21A and 21B are also formed. Since the slits 21A1 and the like are formed on the side surfaces, the heat of the exhaust pipe 13 is not trapped between the first divided cover portion 21A and the second divided cover portion 21B and the exhaust pipe 13, and the heat of the exhaust pipe 13 is It is possible to dissipate to the outside through the gap 21C and the slit 21A. Therefore, it is possible to suppress the heating of the first and second divided cover portions 21A and 21B due to such a bulky heat.

  In the first embodiment, the pair of support members 24b and 24c are fixed to the upper portion of the exhaust pipe 13, and the pair of standing members 24d and 24e are mounted on the annular member 24a supported by the support members 24b and 24c. The lower part is fixed. With this configuration, the attachment position of the exhaust pipe cover 21 in the cover holding portion 24 can be a high position above the exhaust pipe 13. Here, the lower portion of the exhaust pipe 13 is located near the introduction portion of the exhaust gas discharged from the muffler 10, and the temperature of the lower portion becomes higher due to the high temperature of the exhaust gas. On the other hand, the temperature of the upper part of the exhaust pipe 13 is lower than that of the lower part of the upper part of the exhaust pipe 13 due to the temperature drop accompanying the rise of the exhaust gas. As described above, the heat of the upper part of the exhaust pipe 13 whose temperature has been lowered is included in the exhaust pipe cover 21 via the support members 24b and 24c, the annular member 24a, and the standing members 24d and 24e. Since it is transmitted to 21A and 21B, the temperature of these 1st, 2nd division | segmentation cover parts 21A and 21B attached to the exhaust pipe 13 by the cover holding | maintenance part 24 can be restrained comparatively low.

  In the first embodiment, the pair of support members 24b and 24c and the pair of standing members 24d and 24e are arranged so as to be orthogonal to each other in plan view. When considering a virtual center line that passes through the center of the pair of support members 24d and 24e in plan view and equally divides the support members 24d and 24e to the left and right, the first split cover portion 21A side and the second The portion of the annular member 24a positioned on the divided cover portion 21B side and each of the pair of standing members 24d and 24e are arranged symmetrically with respect to the above-mentioned center line, so that a stable weight balance between the left and right is ensured. Thus, stable holding of the first and second divided cover portions 21A and 21B with respect to the exhaust pipe 13 can be realized. Further, the heat transfer path transmitted from the support members 24b and 24c to the first divided cover portion 21A or the second divided cover portion 21B via the annular member 24a and the standing members 24d and 24e may be a relatively long path. This contributes to lowering the temperatures of the first and second divided cover portions 21A and 21B.

  Further, according to the first embodiment, the upper portions of the first and second divided cover portions 21A and 21B are held by the cover holding portion 24 and the lower portions are fixed to the counterweight 7, so that these As described above, the first and second divided cover portions 21A and 21B can be stably erected and held in a self-standing state that does not come into contact with surrounding members. Accordingly, the first and second divided cover portions 21A and 21B can be cooled by the air surrounding the first and second divided cover portions 21A and 21B, and the heat of the first and second divided cover portions 21A and 21B can be reduced. It is prevented from being transmitted to surrounding members. In addition, since only one cover holding portion 24 that tends to have a large number of members is provided, it contributes to a reduction in manufacturing costs.

  In the first embodiment, the height of the exhaust pipe 13 is set to a height dimension in which the exhaust port 13a is disposed between the uppermost part 6a and the lowermost part 6b of the roof 6 of the canopy 4. It is. With this configuration, the exhaust gas discharged from the exhaust port 13a of the exhaust pipe 13 is blocked by the portion between the uppermost part 6a and the lowermost part 6b of the canopy 6 when the revolving structure 2 is turning, etc. The flow of exhaust gas in the direction of the seat 3 can be reduced. In the mini excavator provided with the exhaust gas treatment device as described above, the temperature of the exhaust gas discharged from the exhaust port 13a of the exhaust pipe 13 is high, but as described above, the exhaust gas flows less in the direction of the driver's seat 3 as described above. Therefore, also from this point, the first embodiment is particularly suitable as a mini excavator provided with the exhaust gas processing device.

  In addition, since the exhaust pipe 13 can be prevented from protruding from the roof 6 of the canopy 4 in the first embodiment, restrictions due to height restrictions imposed when the mini excavator is carried on a trailer are eased. Can be made. Further, in the first embodiment, when the entrance is attempted from the entrance of the building for carrying out the work in the building, the exhaust pipe 13 is provided as long as the entrance height is higher than the height of the roof 6. You can enter the building without hitting the top of the entrance. That is, this 1st Embodiment can ease the restrictions at the time of conveyance of the said mini excavator, or the work in a building.

  Further, in this first embodiment, the exhaust pipe 13 is arranged so that the exhaust port 13a faces rearward, so that the discharged exhaust gas is operated with the exhaust gas discharge direction being the direction opposite to the driver's seat 3. It can be prevented from flowing in the direction of the seat 3.

  In the first embodiment, since the height dimension from the ground where the mini excavator is installed to the exhaust port 13a of the exhaust pipe 13 is set to a height dimension that is higher than the average height of an adult, It is possible to realize protection from the exhaust gas for the people existing around.

  In the first embodiment, as shown in FIG. 13, a passage 7 a into which the tail pipe 11 is inserted is provided in the counterweight 7, and the upper end 11 a of the tail pipe 11 is inserted into the exhaust pipe 13. Therefore, the exhaust gas guided from the muffler 10 to the tail pipe 11 is not radiated to the wall surface forming the passage 7 a of the counterweight 7, and between the tail pipe 11 and the wall surface forming the passage of the counterweight 7. A gap is provided in Therefore, the counterweight 7 is not directly heated, and the temperature rise of the counterweight 7 due to the exhaust gas can be suppressed to be low. Therefore, it is possible to prevent discomfort caused by contact with the counterweight 7 while the exhaust gas is discharged from the exhaust pipe 13.

  14 is a side view showing the body of a mini excavator constituting a second embodiment of the working machine according to the present invention, FIG. 15 is a rear view of the body of the mini excavator shown in FIG. 14, and FIG. 16 is a mini excavator shown in FIG. FIG. 17 is a plan view showing a state in which the roof of the cab is removed from the mini excavator vehicle body shown in FIG. 14, and FIG. 18 is a perspective view of the mini excavator vehicle body shown in FIG. It is.

  As shown in FIGS. 16 to 18, the work machine according to the second embodiment is also composed of, for example, a mini excavator, and includes a traveling body 41 that constitutes a vehicle body and a revolving body 42, and is illustrated on the front side of the revolving body 42. The support part 56 to which the working apparatus which is not attached is attached is provided. The working device includes a boom, an arm, a bucket, and the like, and can perform earth and sand excavation work and the like.

  A counterweight 47 that secures a weight balance is provided at a portion of the revolving structure 2 located on the rear side of the cab 44. The counterweight 47 is provided with an exhaust pipe 53 (described later) having an exhaust port 53a through which engine exhaust gas is discharged above the counterweight 47 in an upright state in a state of being separated from the cab 44. Further, an exhaust pipe cover 61 is provided so as to surround the exhaust pipe 53 to be described later and an upper part thereof so as to prevent contact with the exhaust pipe 53.

  In the second embodiment, as shown in FIG. 17, on a virtual straight line 58 that connects a seat reference point 57 that is a ship point of the driver's seat 43 and a rear left support column 45 included in the driver's cab 44, for example. An exhaust pipe 53 and an exhaust pipe cover 61, which will be described later, are arranged. As a result, when the operator is seated on the driver's seat 43, the exhaust pipe 53 and the exhaust pipe cover 61 are positioned behind the operator.

  FIG. 19 is a view showing an exhaust pipe and an exhaust pipe cover provided in the second embodiment, wherein (a) is a front view, (b) is a plan view, and (c) is a perspective view seen from the front side; (D) is a perspective view seen from the back side, FIG. 20 is a view showing an exhaust pipe and an exhaust pipe cover provided in the second embodiment, (a) is a rear view, and (b) is (a). FIG. 4A is a cross-sectional view taken along the line A-B in FIG. 4A, FIG. 4D is a cross-sectional view taken along the line C-C in FIG.

  As shown in FIGS. 19 and 20, the lower end of the exhaust pipe 53 has a hole portion that communicates with the tubular portion of the exhaust pipe 53 and is integrally provided with a flange 59 that is fixed to the upper surface of the counterweight 47. It is. The flange 59 is fixed to the upper surface of the counterweight 47 with a bolt 55.

  This second embodiment also includes a cutout portion in the lower end portion of the exhaust pipe cover 61 that forms an opening 70 that allows insertion of a cleaning tool such as a brush (not shown). As shown in FIG. 14, the exhaust pipe cover 61 is disposed so that the above-described opening 70 is located only on the side of the cab 44 where the driver's seat 43 is disposed, for example.

  The exhaust pipe cover 61 extends along the direction in which the exhaust pipe 53 extends, and the first divided cover portion 61A and the second divided cover are arranged to face each other with a gap 61C so as to sandwich the exhaust pipe 53. It consists of part 61B. The above-described cutout portion includes a first cutout portion 61A2 formed at the lower end portion of the first divided cover portion 61A and a second cutout portion 61B2 formed at the lower end portion of the second divided cover portion 61B. ing. 61 A of 1st division | segmentation cover parts and the 2nd division | segmentation cover part 61B are provided with flat 1st attachment part 61A3 and 2nd attachment part 61B which are attached to the upper surface of the counterweight 47 in each lower end. These mounting portions 61A3 and 61B3 are fastened together with the flange 59 of the exhaust pipe 53 by the bolt 55 described above and fixed to the counterweight 47. A large number of slits 61A1 are formed on the side surface of the first divided cover portion 61A. Similarly, a large number of slits are formed on the side surface of the second divided cover portion 61B.

  As shown in FIG. 19 (d) and FIG. 20 (a), a connecting tool 62 is integrally welded to the first divided cover portion 61A, for example. The connector 62 and the second divided cover portion 61B are fastened by a bolt 63.

  FIG. 21 is a plan view of a main part showing the positional relationship between the tail pipe and the exhaust pipe provided in the second embodiment.

  Similarly to the first embodiment, the second embodiment also has a muffler 50 that silences the exhaust gas of an engine (not shown) guided on the revolving frame 42a of the revolving structure 42, and the exhaust discharged from the muffler 50. A tail pipe 51 for guiding gas is disposed. A passage 47a is formed in the counterweight 47. The tail pipe 51 is inserted into the passage 47 a so as not to contact the wall surface of the counterweight 47 forming the passage 47 a, and the upper end 51 a thereof is inserted into the exhaust pipe 53. The engine exhaust gas is discharged from the exhaust port 53a of the exhaust pipe 53 through the muffler 50 and the tail pipe 51, as in the first embodiment.

  Similarly to the first embodiment, the second embodiment also has an opening 70 that allows a cleaning tool such as a brush to be inserted into the lower ends of the first and second divided cover portions 61A and 61B included in the exhaust pipe cover 61. Since the first and second cutout portions 61A2 and 61B2 forming the first and second cutout portions 61A2 and 61B2 are formed, dust such as dead leaves enters the gap 53b between the exhaust pipe 53 and the first and second divided cover portions 61A and 61B. If the first and second divided cover portions 61A and 61B are collected near the lower ends, the opening 70 is the same as in the first embodiment without disassembling the first and second divided cover portions 61A and 61B. The cleaning tool such as a brush can be inserted into the dust and the dust can be easily removed by cleaning, and the same effect as the first embodiment can be obtained.

  Also in the second embodiment, when an operator sitting in the driver's seat 43 in the driver's cab 44 wants to visually check the rear, the operator can stand up to the seat reference point 57 of the driver's seat 43 and the rear side of the driver's seat 43. The exhaust pipe 53 is completely or substantially completely hidden behind the rear left column 45 located on a virtual straight line 58 connecting the rear left column 45 to be provided. Accordingly, the operator sitting in the driver's seat 43 is less likely to be blocked by the exhaust pipe 53, and a good rear view can be secured. Thereby, the same operation effect as a 1st embodiment is obtained. The second embodiment is also suitable for a mini excavator that includes an exhaust gas treatment device and that tends to increase the radiant heat of the exhaust pipe 53.

  In addition, the operational effects obtained by providing the same components as those in the first embodiment are the same as those in the first embodiment.

  In the first embodiment, the exhaust pipe 13 and the exhaust pipe cover 21 are arranged in the vicinity of a virtual straight line 18 that connects the seat reference point 17 of the driver's seat 3 and the rear left column 5d of the canopy 4. The exhaust pipe 13 and the exhaust pipe cover 21 may be arranged on the straight line 18. In the second embodiment, the exhaust pipe 53 and the exhaust pipe cover 61 are arranged on a virtual straight line 58 that connects the seat reference point 57 of the driver's seat 43 and the rear left support column 45 included in the driver's cab 44. However, the exhaust pipe 53 and the exhaust pipe cover 61 may be arranged near the virtual straight line 58.

  Moreover, although the said 1st Embodiment has arrange | positioned the exhaust pipe 13 and the exhaust pipe cover 21 in the position near the virtual straight line 18 which connects the seat reference point 17 of the driver's seat 3 and the rear left support | pillar 5d of the canopy 4. FIG. The exhaust pipe 13 and the exhaust pipe cover 21 are arranged on a virtual straight line connecting the seat reference point 17 of the driver's seat 3 and the rear right support column 5c of the canopy 4 or in the vicinity of the virtual straight line. It may be configured. Similarly, in the second embodiment, the exhaust pipe 53 and the exhaust are arranged on a virtual straight line 58 that connects the seat reference point 57 of the driver's seat 43 in the driver's cab 44 and the rear left support column 45 included in the driver's cab 44. Although the pipe cover 61 is disposed, the exhaust pipe is located on or near a virtual straight line connecting the seat reference point 57 of the driver's seat 43 and the rear right support column included in the driver's cab 44. 53 and the exhaust pipe cover 61 may be arranged. Those configured as described above can also ensure a good rear view of an operator or the like seated on the driver's seat 3 or 43.

  In the first embodiment, the exhaust pipe 13 is arranged so that the exhaust port 13a faces the rear of the cab 3. However, the exhaust pipe 13 may be arranged so that the exhaust port 13a faces the side. Good. The same applies to the second embodiment, and the exhaust pipe 53 may be arranged so that the exhaust port 53a faces the rear of the cab 44 or the side of the cab 44.

  In the first embodiment, only one cover holding portion 24 for holding the exhaust pipe cover 21 on the exhaust pipe 13 is provided in the upper part of the exhaust pipe 13. 7, the exhaust pipe cover 21 may be held by the exhaust pipe 13 by the cover holding portions 24 provided in both the upper part and the lower part of the exhaust pipe 13.

  Moreover, although the work machine which concerns on the said 1st, 2nd embodiment consists of a mini excavator, respectively, this invention is not limited to a mini excavator. The present invention can also be applied to a working machine such as a hydraulic excavator that is larger than a mini excavator.

1 Running body (car body)
2 Revolving body (car body)
3 Driver's seat 7 Counterweight 7a Upper surface 13 Exhaust pipe 13a Exhaust port 13b Gap 16 Support part 21 Exhaust pipe cover 21A First divided cover part 21A2 First cutout part 21A3 First attachment part 21B Second divided cover part 21B2 Second cut Notch portion 21B3 Second mounting portion 21C Clearance 30 Opening portion 41 Traveling body (vehicle body)
42 Revolving body (car body)
43 Driver's seat 47 Counterweight 47b Upper surface 53 Exhaust pipe 53a Exhaust port 53b Clearance 56 Support part 61 Exhaust pipe cover 61A First divided cover part 61A2 First cutout part 61A3 First attachment part 61B Second divided cover part 61B2 Second cut Notch 61B3 First attachment 61C Clearance 70 Opening

Claims (4)

Exhaust having a vehicle body, a working device attached to the vehicle body, a muffler arranged in the vehicle body, through which exhaust gas from the engine is guided, and an exhaust port for discharging exhaust gas discharged from the muffler at a position above the vehicle body In a work machine provided with an exhaust pipe cover disposed on the vehicle body with a gap between the pipe and the exhaust pipe so as to surround the exhaust pipe, and preventing contact with the exhaust pipe,
A working machine, wherein a notch for forming an opening that allows insertion of a cleaning tool is formed in a lower end portion of the exhaust pipe cover. The work machine according to claim 1,
The vehicle body includes a revolving body, a driver's seat is disposed on the revolving body, the revolving body includes a counterweight disposed behind the driver's seat, and the exhaust pipe and the exhaust pipe cover are attached to the counterweight. A work machine characterized in that an exhaust pipe cover is disposed so as to stand on an upper surface so that the opening is located only on the driver's seat side. The work machine according to claim 2,
The exhaust pipe cover extends along the extending direction of the exhaust pipe, and includes a first divided cover portion and a second divided cover portion that are arranged to face each other with a gap so as to sandwich the exhaust pipe. The cutout portion includes a first cutout portion formed at a lower end portion of the first divided cover portion and a second cutout portion formed at a lower end portion of the second divided cover portion. A working machine characterized by The work machine according to claim 3,
The work machine characterized in that the first divided cover part and the second divided cover part have attachment parts attached to the upper surface of the counterweight at their lower ends.

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