JP2014118034A - Hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic shovel capable of improving fitting workability of an exhaust processing device.SOLUTION: A first contact part 422 of a select reduction catalyst device 42 (one example of an exhaust processing device) has first to third contact faces 422a to 422c which are vertical to a radial direction whose center is a central axial line Ax2. And a first support plate 110 (one example of a first support part) of a bracket 43 has a first upper concavity 111 (one example of a first concavity) on which the first contact part 422 is mounted. The first upper concavity 111 has first to third support faces 111a to 111c to which the first to third contact faces 422a to 422c contact.

Description

  The present invention relates to a hydraulic excavator.

  An exhaust treatment device is mounted on the hydraulic excavator. The exhaust treatment device is connected to the engine via a connection pipe in order to process exhaust from the engine. Examples of the exhaust treatment device include a diesel particulate collection filter device for reducing particulate matter in the exhaust, a selective reduction catalyst device for reducing nitrogen oxide (NOx) in the exhaust, and the like.

  The exhaust treatment device is generally formed in a cylindrical shape, and is fixed on a concave portion of a mounting bracket formed by bending a plate-like member (see Patent Document 1).

International Publication Number WO2009 / 142058

  However, when a cylindrical exhaust treatment device is used, the position of the exhaust treatment device around the axis is not determined even if the exhaust treatment device is placed on the recess. For this reason, it is necessary to finely adjust the position of the exhaust treatment device by rotating the exhaust treatment device around the axis after the exhaust treatment device is placed on the recess.

  An object of the present invention is to provide a hydraulic excavator that can improve the workability of mounting an exhaust treatment device.

  A hydraulic excavator according to a first aspect of the present invention includes an engine, a cylindrical exhaust treatment device, and a first support portion. The exhaust processing device is disposed along a predetermined direction and processes exhaust from the engine. The first support part supports the exhaust treatment device. The exhaust treatment device includes a first contact portion formed on the side surface and in contact with the first support portion. The first abutting portion has first to third abutting surfaces perpendicular to the radial direction centered on the axis of the exhaust treatment device. The first support part includes a first recess on which the first contact part is placed. The first recess has first to third support surfaces with which the first to third contact surfaces come into contact.

  According to the hydraulic excavator according to the first aspect of the present invention, when the exhaust treatment device is attached, the first to third contact surfaces are brought into contact with the first to third support surfaces, thereby attaching the exhaust treatment device to the first support portion. The exhaust treatment device can be positioned. For this reason, it is possible to improve the mounting workability of the exhaust treatment device.

  The hydraulic excavator according to the second aspect of the present invention relates to the first aspect, and the first to third contact surfaces coincide with a regular octagonal or regular hexagonal outer shape centering on the axis.

  In the hydraulic excavator according to the second aspect of the present invention, the first recess can be opened sufficiently large, so that the exhaust treatment device can be stably supported in the first recess.

  A hydraulic excavator according to a third aspect of the present invention relates to the first or second aspect, and includes a second support portion that supports the exhaust treatment device. The exhaust treatment device includes a second contact portion formed on the side surface and in contact with the second support portion. The second contact portion is separated from the first contact portion in the direction in which the axis extends. The second contact portion has fourth to sixth contact surfaces perpendicular to the radial direction. The second support plate includes a second recess on which the second contact portion is placed. The second recess has fourth to sixth support surfaces with which the fourth to sixth contact surfaces come into contact.

  According to the hydraulic excavator according to the third aspect of the present invention, when the exhaust treatment device is attached, not only the first contact portion and the first support portion but also the second contact portion and the second support portion are positioned. It can be carried out. Therefore, since it can position on each of the front side and the rear side of the cylindrical exhaust treatment device, the exhaust treatment device can be positioned easily.

  A hydraulic excavator according to a fourth aspect of the present invention relates to the third aspect, and the fourth to sixth contact surfaces coincide with a regular octagonal or regular hexagonal outer shape centering on the axis.

  According to the hydraulic excavator of the fourth aspect of the present invention, the second recess can be opened sufficiently large, so that the exhaust treatment device can be stably supported in the second recess.

  A hydraulic excavator according to a fifth aspect of the present invention relates to any one of the first to fourth aspects, and includes a cylindrical second exhaust treatment device that is disposed along a predetermined direction and that treats exhaust from the engine. Prepare. The first support part includes a curved recess in which the second exhaust treatment device is placed. The curved recess has a curved support surface with which the second exhaust treatment device comes into contact.

  A hydraulic excavator according to a sixth aspect of the present invention relates to any one of the first to fifth aspects, and the contact portion is formed in an annular shape centering on the axis of the first exhaust treatment device. The contact portion has a plurality of contact surfaces including first to third contact surfaces.

  In the hydraulic excavator according to the sixth aspect of the present invention, the first to third contact surfaces can be appropriately selected from the plurality of contact surfaces formed on the side surface of the first exhaust treatment device. The degree of freedom of the arrangement position of the first exhaust treatment device can be improved.

  A hydraulic excavator according to a seventh aspect of the present invention relates to any one of the first to sixth aspects, and the contact portion is provided in a portion received by the support portion of the first exhaust treatment device.

  ADVANTAGE OF THE INVENTION According to this invention, the hydraulic shovel which can improve the workability | operativity of an exhaust-gas treatment apparatus can be provided.

1 is a perspective view of a hydraulic excavator according to an embodiment of the present invention. The figure which looked at the internal structure of the engine room from back. The top view which shows the internal structure of an engine room. The figure which looked at the diesel particulate collection filter apparatus and the selective reduction catalyst apparatus from back. The figure which looked at the exhaust processing unit from diagonally backward upper direction. The figure which looked at the bracket from diagonally behind the upper left. The figure which looked at the selective reduction catalyst device from the back. The external view of a bulge processing apparatus. The figure for demonstrating the preparation methods of the selective reduction catalyst apparatus by a bulge process. The figure for demonstrating the preparation methods of the selective reduction catalyst apparatus by a bulge process. The figure which shows the structure of a bracket. The figure which looked at the exhaust processing unit which concerns on other embodiment from diagonally back upper direction.

(Overall configuration of hydraulic excavator 100)
A hydraulic excavator 100 according to an embodiment of the present invention is shown in FIG. The excavator 100 includes a vehicle main body 1 and a work machine 4.

  The vehicle body 1 includes a traveling body 2 and a turning body 3. The traveling body 2 includes a pair of traveling devices 2a and 2b. Each traveling device 2a, 2b has crawler belts 2d, 2e. The traveling devices 2a and 2b cause the excavator 100 to travel by driving the crawler belts 2d and 2e with driving force from an engine 21 (see FIG. 2) described later.

  In the following description, the front-rear direction means the front-rear direction of the vehicle body 1. In other words, the front-rear direction is the front-rear direction viewed from the operator seated in the cab 5. Moreover, the left-right direction or the side means the vehicle width direction of the vehicle body 1. In other words, the left-right direction, the vehicle width direction, or the side is the left-right direction viewed from the operator. In the drawings, the front-rear direction is indicated by the x-axis, the left-right direction is indicated by the y-axis, and the up-down direction is indicated by the z-axis.

  The swivel body 3 is placed on the traveling body 2. The swivel body 3 is provided so as to be turnable with respect to the traveling body 2. The revolving unit 3 is provided with a cab 5. The revolving unit 3 includes a fuel tank 14, a hydraulic oil tank 15, an engine chamber 16, and a counterweight 18. The fuel tank 14 stores fuel for driving an engine 21 (see FIG. 2) described later. The fuel tank 14 is disposed in front of the hydraulic oil tank 15. The hydraulic oil tank 15 stores hydraulic oil discharged from a hydraulic pump 23 (see FIG. 2) described later. The hydraulic oil tank 15 is arranged side by side with the fuel tank 14 in the front-rear direction.

  The engine chamber 16 houses devices such as the engine 21 and the hydraulic pump 23 as will be described later. The engine compartment 16 is disposed behind the cab 5, the fuel tank 14, and the hydraulic oil tank 15. An upper portion of the engine chamber 16 is covered with an engine hood 17. The counterweight 18 is disposed behind the engine chamber 16. The internal structure of the engine chamber 16 will be described later.

  The work machine 4 is attached to the front center position of the revolving structure 3. The work machine 4 includes a boom 7, an arm 8, a bucket 9, a boom cylinder 10, an arm cylinder 11, and a bucket cylinder 12. A base end portion of the boom 7 is rotatably connected to the swing body 3. Further, the distal end portion of the boom 7 rotatably supports the proximal end portion of the arm 8. The tip of the arm 8 supports the bucket 9 in a rotatable manner. The boom cylinder 10, the arm cylinder 11, and the bucket cylinder 12 are hydraulic cylinders and are driven by hydraulic oil discharged from a hydraulic pump 23 described later. The boom cylinder 10 operates the boom 7. The arm cylinder 11 operates the arm 8. The bucket cylinder 12 operates the bucket 9. The work machine 4 is driven by driving these cylinders 10, 11, and 12.

(Internal structure of engine compartment 16)
FIG. 2 is a view of the internal structure of the engine compartment 16 as viewed from the rear. FIG. 3 is a top view showing the internal structure of the engine compartment 16.

  As shown in FIG. 2, an engine 21, a flywheel housing 22, a hydraulic pump 23, and an exhaust treatment unit 24 are disposed in the engine chamber 16. A cooling device 25 including a radiator and an oil cooler is disposed in the engine chamber 16. The cooling device 25, the engine 21, the flywheel housing 22, and the hydraulic pump 23 are arranged side by side in the vehicle width direction.

  As shown in FIG. 2, the excavator 100 includes a turning frame 26 and a body frame 27. The turning frame 26 includes a pair of center frames 26a and 26b extending in the front-rear direction. The turning frame 26 supports the engine 21 via a rubber damper.

  The vehicle body frame 27 is erected on the turning frame 26. The vehicle body frame 27 is disposed around equipment such as the engine 21 and the hydraulic pump 23. An exterior cover 28 is attached to the vehicle body frame 27. In FIG. 2, only a part of the exterior cover 28 is illustrated. The engine hood 17 shown in FIG. 1 is also attached to the vehicle body frame 27.

  As shown in FIGS. 2 and 3, the vehicle body frame 27 includes a plurality of column members 31-35 and a plurality of beam members 36 and 37. The column members 31-35 are arranged so as to extend upward from the revolving frame 26. The beam members 36 and 37 are supported by column members 31-35. Specifically, as shown in FIG. 3, the plurality of beam members 36 and 37 include a first beam member 36 and a second beam member 37. The first beam member 36 and the second beam member 37 are arranged away from each other in the front-rear direction. The first beam member 36 is disposed in front of the engine 21. The second beam member 37 is disposed behind the engine 21.

  The hydraulic pump 23 is driven by the engine 21. As shown in FIG. 2, the hydraulic pump 23 is disposed on the side of the engine 21. That is, the hydraulic pump 23 is arranged side by side with the engine 21 in the vehicle width direction. The hydraulic pump 23 is disposed at a position lower than the upper surface of the engine 21. In general, the hydraulic pump 23 needs to be regularly inspected.

  Therefore, in this embodiment, a space is provided below the diesel particulate filter device 41 so that the operator can open the exterior cover 28 and access the hydraulic pump 23.

  The flywheel housing 22 is disposed between the engine 21 and the hydraulic pump 23. The flywheel housing 22 is attached to the side surface of the engine 21. The hydraulic pump 23 is attached to the side surface of the flywheel housing 22.

  The exhaust treatment unit 24 includes a diesel particulate filter device 41, a selective reduction catalyst device 42, and a bracket 43. The exhaust processing unit 24 is disposed above the hydraulic pump 23. The exhaust processing unit 24 is disposed between the first beam member 36 and the second beam member 37. The exhaust processing unit 24 is supported by the beam members 36 and 37. That is, the diesel particulate filter device 41 and the selective catalytic reduction device 42 are supported by the vehicle body frame 27.

  The diesel particulate filter device 41 is a device that processes exhaust from the engine 21. The diesel particulate filter device 41 is connected to the exhaust port of the engine 21 via the first connection pipe 51. The diesel particulate filter device 41 collects particulate matter contained in the exhaust gas with a filter. The diesel particulate filter device 41 incinerates the collected particulate matter with a heater attached to the filter.

  Here, the first connecting pipe 51 is provided with an expandable / contractible bellows portion 54. The bellows portion 54 is configured, for example, by connecting a plurality of bellows type expansion joints. Such a first connecting pipe 51 is attached after the engine 21 and the exhaust processing unit 24 are arranged. In the present embodiment, the first connecting pipe 51 can be attached with good workability using the space provided below the selective reduction catalyst device 42.

  The diesel particulate filter device 41 has a substantially cylindrical outer shape. As shown in FIG. 3, the center axis Ax1 of the diesel particulate filter device 41 is arranged along the front-rear direction. Therefore, the central axis Ax1 of the diesel particulate filter device 41 is disposed orthogonal to the direction in which the engine 21 and the hydraulic pump 23 (see FIG. 2) are arranged. Further, the central axis Ax1 of the diesel particulate filter device 41 is arranged in parallel with the central axis Ax2 of the selective catalytic reduction device 42. That is, the diesel particulate filter device 41 and the selective catalytic reduction device 42 are arranged in parallel along the front-rear direction. However, the diesel particulate filter device 41 is farther from the engine 21 than the selective catalytic reduction device 42. Therefore, the distance between the central axis Ax1 of the diesel particulate filter device 41 and the engine 21 is larger than the distance between the central axis Ax2 of the selective catalytic reduction device 42 and the engine 21.

  The selective catalytic reduction device 42 is a device that processes exhaust from the engine 21. The selective catalytic reduction device 42 is connected to the diesel particulate filter device 41 via the second connection pipe 52. The selective reduction catalyst device 42 hydrolyzes the urea water injected from the urea water injection device 49 and selectively reduces nitrogen oxides NOx in the exhaust gas. Exhaust gas treated by the selective catalytic reduction device 42 passes through the third connection pipe 53 and is discharged above the engine hood 17.

  The selective catalytic reduction device 42 has a substantially cylindrical outer shape. The central axis Ax2 of the selective catalytic reduction device 42 is arranged along the front-rear direction. Accordingly, the central axis Ax2 of the selective catalytic reduction device 42 is arranged orthogonal to the direction in which the engine 21 and the hydraulic pump 23 are arranged.

  The selective catalytic reduction device 42 is disposed above the engine 21, flywheel housing 22 and hydraulic pump 23. The bottom of the selective catalytic reduction device 42 is located above the upper surface of the engine 21. The bottom of the selective catalytic reduction device 42 is disposed above the beam members 36 and 37. The bottom of the selective catalytic reduction device 42 is located at substantially the same height as the top of the diesel particulate filter device 41. The configuration of the selective reduction catalyst device 42 will be described later.

  Here, FIG. 4 is a view of the diesel particulate filter device 41 and the selective reduction catalyst device 42 as seen from the rear. FIG. 5 is a view of the exhaust processing unit 24 as viewed obliquely from behind and above.

  As shown in FIGS. 4 and 5, the diesel particulate filter device 41 and the selective catalytic reduction device 42 are arranged close to each other. The diesel particulate filter device 41 and the selective reduction catalyst device 42 are arranged side by side in the vehicle width direction with their longitudinal directions orthogonal to the vehicle width direction.

  At least a part of the diesel particulate filter device 41 is located below the selective reduction catalyst device 42. Specifically, the top of the diesel particulate filter device 41 is positioned below the top of the selective catalytic reduction device 42. The bottom of the diesel particulate filter device 41 is positioned below the bottom of the selective catalytic reduction device 42. The top of the diesel particulate filter device 41 is located above the beam members 36 and 37. The diesel particulate filter device 41 is disposed above the hydraulic pump 23.

  The bracket 43 connects the diesel particulate filter device 41 and the selective catalytic reduction device 42. Thereby, the diesel particulate filter device 41 and the selective reduction catalyst device 42 are integrated. The bracket 43 is fixed to the vehicle body frame 27. Thereby, the exhaust processing unit 24 is fixed to the vehicle body frame 27. The bracket 43 is detachably attached to the vehicle body frame 27 by fixing means such as bolts. Therefore, the exhaust treatment unit 24 can be removed from the vehicle by removing the bracket 43 from the vehicle body frame 27. The configuration of the bracket 43 will be described later.

  As described above, in the engine chamber 16, the engine 21, the first connection pipe 51, the diesel particulate filter device 41, the second connection pipe 52, the selective reduction catalyst device 42, and the third Are connected in order. Therefore, the exhaust from the engine 21 passes through the first connection pipe 51 and is sent to the diesel particulate filter device 41. In the diesel particulate filter device 41, the particulate matter is mainly reduced from the exhaust gas. Next, the exhaust gas passes through the second connection pipe 52 and is sent to the selective reduction catalyst device 42. In the selective reduction catalyst device 42, NOx is mainly reduced. Thereafter, the cleaned exhaust gas is discharged to the outside through the third connection pipe 53.

(Configuration of Selective Reduction Catalyst Device 42 and Bracket 43)
Next, the configurations of the selective catalytic reduction device 42 and the bracket 43 will be described with reference to the drawings. FIG. 6 is a view of the bracket 43 as viewed from the upper left behind. FIG. 7 is a view of the selective reduction catalyst device 42 as viewed obliquely from below. However, in FIG. 6, a connection band for fastening the diesel particulate filter device 41 and the selective catalytic reduction device 42 is omitted.

1. Bracket 43
As shown in FIG. 6, the bracket 43 includes a first support plate 110, a second support plate 120, a first support pipe 210, a second support pipe 220, a first connection member 310, and a second connection member. 320.

  The first support plate 110 is a plate-like member supported by the first support pipe 210 and the second support pipe 220. The first support plate 110 is disposed along the left-right direction. The first support plate 110 is disposed perpendicular to the front-rear direction.

  The first support plate 110 includes a first upper recess 111 (an example of a first recess) and a first lower recess 112 (an example of a curved recess). The first upper recess 111 is formed above the first lower recess 112. A rear portion of the selective catalytic reduction device 42 is placed in the first upper recess 111. A rear portion of the diesel particulate filter device 41 is placed in the first lower recess 112. The first lower recess 112 has a curved support surface 112a against which the diesel particulate filter device 41 abuts.

  The first upper recess 111 has a first support surface 111a, a second support surface 111b, and a third support surface 111c. The first to third support surfaces 111a to 111c are successively connected in the left-right direction. The first to third support surfaces 111a to 111c are in contact with first to third contact surfaces 422a to 422c described later. As a result, the rear portion of the selective catalytic reduction device 42 is supported by the first support plate 110.

  The first to third support surfaces 111a to 111c are each formed in a planar shape. The first support surface 111a is continuous with the second support surface 111b. The first support surface 111a forms an obtuse angle with the second support surface 111b. The second support surface 111b is continuous with the first support surface 111a and the third support surface 111c. In the present embodiment, the second support surface 111b is a horizontal plane. The third support surface 111c is continuous with the second support surface 111b. The third support surface 111c forms an obtuse angle with the second support surface 111b. In addition, the first support surface 111a preferably forms an angle of 90 degrees or more with the third support surface 111c, and more preferably forms an angle of 120 degrees or more. In the present embodiment, the first support surface 111a forms an angle of 90 degrees with the first support surface 111a.

  The second support plate 120 is a plate-like member supported by the first support pipe 210 and the second support pipe 220. The second support plate 120 is disposed along the left-right direction. The second support plate 120 is disposed perpendicular to the front-rear direction.

  The second support plate 120 has a second upper recess 121 (an example of a second recess) and a second lower recess 122. The second upper recess 121 is formed above the second lower recess 122. A front side portion of the selective catalytic reduction device 42 is placed on the second upper concave portion 121. A front side portion of the diesel particulate filter device 41 is placed in the second lower recess 122. The second lower concave portion 122 has a curved support surface 122a with which the diesel particulate filter device 41 abuts.

  The second upper recess 121 has a fourth support surface 121a, a fifth support surface 121b, and a sixth support surface 121c. The fourth to sixth support surfaces 121a to 121c are successively connected in the left-right direction. The fourth to sixth support surfaces 121a to 121c are in contact with later-described fourth to sixth contact surfaces 423a to 423c. As a result, the front portion of the selective catalytic reduction device 42 is supported by the second support plate 120.

  The fourth to sixth support surfaces 121a to 121c are each formed in a planar shape. The fourth support surface 121a is continuous with the fifth support surface 121b. The fourth support surface 121a forms an obtuse angle with the fifth support surface 121b. The fifth support surface 121b is continuous with the fourth support surface 121a and the sixth support surface 121c. In the present embodiment, the fifth support surface 121b is a horizontal plane. The sixth support surface 121c is continuous with the fifth support surface 121b. The sixth support surface 121c forms an obtuse angle with the fifth support surface 121b. The fourth support surface 121a preferably forms an angle of 90 degrees or more with the sixth support surface 121c, and more preferably forms an angle of 120 degrees or more. In the present embodiment, the fourth support surface 121a forms an angle of 90 degrees with the sixth support surface 121c.

  The first support pipe 210 is disposed along the front-rear direction. The first support pipe 210 is constituted by a square pipe member. The first support pipe 210 has a rear end portion 211, a front end portion 212, and an intermediate portion 213.

  The rear end portion 211 is connected to the vehicle body frame 27 (specifically, the beam member 37). The front end portion 212 is connected to the vehicle body frame 27 (specifically, the beam member 36). The intermediate part 213 is connected to the rear end part 211 and the front end part 212. The intermediate part 213 supports the first support plate 110 and the second support plate 120. In the present embodiment, the intermediate portion 213 is formed in a convex shape upward.

  The second support pipe 220 is disposed along the front-rear direction. The second support pipe 220 is arranged in parallel with the first support pipe 210. The second support pipe 220 is constituted by a square pipe member. The second support pipe 220 has a rear end portion 221, a front end portion 222, and an intermediate portion 223.

  The rear end 221 is connected to the vehicle body frame 27 (specifically, the beam member 37). The front end portion 222 is connected to the vehicle body frame 27 (specifically, the beam member 36). The intermediate part 223 is connected to the rear end part 221 and the front end part 222. The intermediate part 223 supports the first support plate 110 and the second support plate 120. In the present embodiment, the intermediate portion 223 is formed in a convex shape downward.

  The 1st connection member 310 and the 2nd connection member 320 are each arrange | positioned along the front-back direction. The first connecting member 310 and the second connecting member 320 are connected to the front surface of the first support plate 110 and the rear surface of the second support plate 120, respectively. The first connecting member 310 and the second connecting member 320 can be configured by a cylindrical or bar-like member or a bent plate-like member, respectively.

2. Selective reduction catalyst device 42
As illustrated in FIG. 7, the selective catalytic reduction device 42 includes a main body 421, a first contact portion 422, and a second contact portion 423.

  The main body 421 is a can body formed in a cylindrical shape. The main body 421 has a cylindrical side surface 421S. The main body 421 contains a catalytic converter.

  The first contact portion 422 is formed so as to protrude from the cylindrical side surface 421S. The first contact portion 422 extends in a belt shape along the circumferential direction centering on the central axis Ax2.

  The first contact portion 422 has a first contact surface 422a, a second contact surface 422b, and a third contact surface 422c. The first to third contact surfaces 422a to 422c are successively connected in the circumferential direction.

  The first to third contact surfaces 422 a to 422 c are in contact with the first to third support surfaces 111 a to 111 c of the first upper recess 111. Specifically, the first contact surface 422 a is in contact with the first support surface 111 a of the first upper recess 111. The second contact surface 422b is in contact with the second support surface 111b of the first upper recess 111. The third contact surface 422c is in contact with the third support surface 111c of the first upper recess 111.

  The first to third contact surfaces 422a to 422c are each formed in a planar shape. The first to third contact surfaces 422a to 422c are perpendicular to the radial direction around the central axis Ax2. The first contact surface 422a is continuous with the second contact surface 422b. The first contact surface 422a forms an angle greater than 180 degrees with the second contact surface 422b. The second contact surface 422b is continuous with the first contact surface 422a and the third contact surface 422c. In the present embodiment, the second contact surface 422b is a horizontal plane. The third contact surface 422c is continuous with the second contact surface 422b. The third contact surface 422c forms an angle greater than 180 degrees with the second contact surface 422b. The first contact surface 422a preferably forms an angle of 90 degrees or more with the third contact surface 422c, and more preferably forms an obtuse angle of 120 degrees or more.

  Such first to third contact surfaces 422a to 422c coincide with a regular octagonal outer shape centering on the central axis Ax2. That is, the first to third contact surfaces 422a to 422c overlap three consecutive sides among the eight sides of the regular octagon when viewed from the axial direction. Accordingly, in the present embodiment, the first contact surface 422a forms an angle of 90 degrees with the third contact surface 422c.

  Only a part of each of the first to third contact surfaces 422a to 422c may be in contact with the first to third support surfaces 111a to 111c, or each of the first to third contact surfaces 422a to 422c. May be in contact with the first to third support surfaces 111a to 111c.

  The second contact portion 423 is formed so as to protrude from the cylindrical side surface 421S. The second contact portion 423 extends in a belt shape along the circumferential direction centering on the central axis Ax2. The second contact portion 423 is separated from the first contact portion 422 in the axial direction in which the central axis Ax2 extends. In the present embodiment, the second contact portion 423 is disposed in front of the first contact portion 422.

  The second contact portion 423 includes a fourth contact surface 423a, a fifth contact surface 423b, and a sixth contact surface 423c. The fourth to sixth contact surfaces 423a to 423c are successively connected in the circumferential direction.

  The fourth to sixth contact surfaces 423 a to 423 c are in contact with the fourth to sixth support surfaces 121 a to 121 c of the second upper recess 121. Specifically, the fourth contact surface 423 a is in contact with the fourth support surface 121 a of the second upper recess 121. The fifth contact surface 423 b is in contact with the fifth support surface 121 b of the second upper recess 121. The sixth contact surface 423 c is in contact with the sixth support surface 121 c of the second upper recess 121.

  The fourth to sixth contact surfaces 423a to 423c are each formed in a planar shape. The fourth to sixth contact surfaces 423a to 423c are perpendicular to the radial direction around the central axis Ax2. The fourth contact surface 423a is continuous with the fifth contact surface 423b. The fourth contact surface 423a forms an angle greater than 180 degrees with the fifth contact surface 423b. The fifth contact surface 423b is continuous with the fourth contact surface 423a and the sixth contact surface 423c. In the present embodiment, the fifth contact surface 423b is a horizontal plane. The sixth contact surface 423c continues to the fifth contact surface 423b. The sixth contact surface 423c forms an angle greater than 180 degrees with the fifth contact surface 423b. Further, the fourth contact surface 423a preferably forms an angle of 90 degrees or more with the sixth contact surface 423c, and more preferably forms an obtuse angle of 120 degrees or more.

  Such fourth to sixth contact surfaces 423a to 423c coincide with a regular octagonal outer shape centered on the central axis Ax2. That is, when viewed from the axial direction, the fourth to sixth contact surfaces 423a to 423c overlap on three consecutive sides among the eight sides of the regular octagon. Therefore, in the present embodiment, the fourth contact surface 423a forms an angle of 90 degrees with the sixth contact surface 423c.

  Note that the fourth to sixth contact surfaces 423a to 423c only have to have shapes and sizes corresponding to the fourth to sixth support surfaces 121a to 121c, and the first to third contact surfaces 422a to 422a to 422a to 422c. It may have a shape or size different from 422c.

  Further, only a part of each of the fourth to sixth contact surfaces 423a to 423c may be in contact with the fourth to sixth support surfaces 111a to 111c, or each of the fourth to sixth contact surfaces 423a to 423c. May be in contact with the fourth to sixth support surfaces 111a to 111c.

(Method for Producing Selective Reduction Catalyst Device 42)
FIG. 8 is an external view of the bulge processing apparatus 60. 9 and 10 are diagrams for explaining a method of manufacturing the container 42A of the selective reduction catalyst device 42 by bulge processing. However, in FIGS. 9 and 10, a cross section of the forming die 61 provided in the bulge processing device 60 is shown so that the inside of the upper die 63 and the elastic body 62 of the bulge processing device 60 can be seen.

  First, as shown in FIG. 8, after the upper die 63 is mounted on the upper die 60a and the molding die (divided die) 61 is mounted on the lower die 60b, the container 42A is loaded on the molding die 61. The mold 61 is formed with a first recess 61 a and a second recess 61 b that are cavities having shapes corresponding to the first contact portion 422 and the second contact portion 423.

  Next, as shown in FIG. 9, the upper die 63 attached to the bulge processing device 60 is lowered to pressurize the elastic body 62 in the container 42A. As a result, the inner surface of the container 42A is pressurized by the elastic body 62, and the container 42A enters the first recess 61a and the second recess 61b, which are cavities provided in the molding die 61. As shown in FIG. (First contact portion 422 and second contact portion 423) are formed.

  Next, after raising the upper mold 63, the mold 61 is divided, and the container 42 </ b> A is taken out from the mold 61. Subsequently, the elastic body 62 is taken out from the container 42A.

  As described above, the container 42A of the selective reduction catalyst device 42 having the first contact portion 422 and the second contact portion 423 is formed.

(Feature)
(1) The first contact portion 422 of the selective reduction catalyst device 42 (an example of an exhaust treatment device) has first to third contact surfaces 422a to 422c perpendicular to the radial direction centered on the central axis Ax2. Have. The first support plate 110 (an example of the first support part) of the bracket 43 has a first upper recess 111 (an example of the first recess) on which the first contact part 422 is placed. The first upper recess 111 has first to third support surfaces 111a to 111c with which the first to third contact surfaces 422a to 422c are in contact.

  Therefore, when the selective reduction catalyst device 42 is attached, the selective reduction catalyst device for the first support plate 110 is brought into contact with the first to third contact surfaces 422a to 422c by contacting the first to third support surfaces 111a to 111c. 42 can be positioned. Therefore, the workability of attaching the selective catalytic reduction device 42 can be improved.

  In addition, even after the selective reduction catalyst device 42 is attached, the selective reduction catalyst device 42 can be supported with the first to third contact surfaces 422a to 422c being in contact with the first to third support surfaces 111a to 111c. Therefore, the positional shift of the selective catalytic reduction device 42 can be suppressed.

  (2) The first to third contact surfaces 422a to 422c coincide with the outer shape of a regular octagon centered on the central axis Ax2.

  Accordingly, the first contact surface 422a forms an angle of 90 degrees with the third contact surface 422c, and the first support surface 111a forms an angle of 90 degrees with the third support surface 111c. doing. Therefore, the first upper recess 111 can be opened sufficiently large, and the selective reduction catalyst device 42 can be stably supported in the first upper recess 111.

  (3) The second contact portion 423 of the selective reduction catalyst device 42 includes fourth to sixth contact surfaces 423a to 423c that are perpendicular to the radial direction about the central axis Ax2. The second contact portion 423 is separated from the first contact portion 422 in the axial direction. The second support plate 120 (an example of the second support part) of the bracket 43 has a second upper recess 121 (an example of the second recess) on which the second contact part 423 is placed. The second upper concave portion 121 includes fourth to sixth support surfaces 121a to 121c with which the fourth to sixth contact surfaces 423a to 423c abut.

  Therefore, when the selective catalytic reduction device 42 is attached, not only the first contact portion 422 and the first support plate 110 but also the second contact portion 423 and the second support plate 120 can be positioned. Therefore, since it can position on each of the front side and the rear side of the cylindrical selective reduction catalyst device 42, the selective reduction catalyst device 42 can be easily positioned.

  (4) The fourth to sixth contact surfaces 423a to 423c coincide with the outer shape of a regular octagon centered on the central axis Ax2.

  Therefore, the fourth contact surface 423a forms an angle of 90 degrees with the sixth contact surface 423c, and the fourth support surface 121a forms an angle of 90 degrees with the sixth support surface 121c. doing. Therefore, since the second upper recess 121 can be opened sufficiently large, the selective reduction catalyst device 42 can be stably supported in the second upper recess 121.

(Other embodiments)
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

  (A) Although the bracket 43 supports both the diesel particulate filter device 41 and the selective reduction catalyst device 42 in the above embodiment, the bracket 43 is not limited to this. As shown in FIG. 11, the bracket 43 may support only one of the diesel particulate collection filter device 41 and the selective reduction catalyst device 42. In this case, the bracket 43 only needs to have the first support plate 110 having the first upper concave portion 111 and the second support plate 120 having the second upper concave portion 121.

  (B) In the above embodiment, the first abutting portion 422 is formed over about a half circumference of the cylindrical side surface 421S as shown in FIG. 7, but the present invention is not limited to this. As shown in FIG. 11, the first contact portion 422 may be formed in an annular shape around the central axis Ax <b> 2 of the selective catalytic reduction device 42. In this case, as shown in FIG. 11, the first contact portion 422 preferably has a plurality of contact surfaces 422x including first to third contact surfaces 422a to 422c. As a result, the first to third contact surfaces can be appropriately selected from the plurality of contact surfaces, so that the degree of freedom of the arrangement position of the selective reduction catalyst device 42 can be improved.

  (C) In the above embodiment, the first support plate 110 and the second support plate 120 are directly supported by the first support pipe 210 and the second support pipe 220. However, the present invention is not limited to this.

  (D) In the above embodiment, the first support plate 110 and the second support plate 120 have been described as an example of the support portion, but the present invention is not limited to this. As shown in FIG. 12, the support part may be a semi-cylindrical table formed by bending a plate-like member. In this case, the 1st thru | or 3rd support surfaces 111a-111c should just be formed in the recessed part 111 extended along the front-back direction.

  (E) In the above embodiment, the first to third contact surfaces 422a to 422c coincide with the regular octagonal outer shape centered on the central axis Ax2, but the present invention is not limited to this. For example, the first to third contact surfaces 422a to 422c may coincide with a polygonal outer shape having fewer corners than a regular octagon, or a polygonal outer shape having more corners than a regular octagon. It may match.

  (F) In the above embodiment, the first lower concave portion 112 and the second lower concave portion 122 are formed to be curved, but the present invention is not limited to this. The first lower recess 112 and the second lower recess 122 may have the same configuration as the first upper recess 111 and the second upper recess 121.

  (G) In the above embodiment, the exhaust treatment device (the diesel particulate filter device 41 and the selective reduction catalyst device 42) has a substantially cylindrical outer shape, but is not limited thereto. The exhaust treatment device may be formed in a cylindrical shape.

  According to the present invention, it is possible to provide a hydraulic excavator that can improve the mounting workability of the exhaust treatment device, and thus is useful in the field of work machines.

21 Engine 24 Exhaust treatment unit 26 Swivel frame 27 Body frame 41 Diesel particulate collection filter device 42 Selective reduction catalyst device 422 First contact portions 422a to 422c First to third contact surfaces 423 Second contact portions 423a to 423c 4th thru | or 6th contact surface 110 1st support plate 111 1st upper side recessed part 111a-111c 1st thru | or 3rd support surface 120 2nd support plate 121 2nd upper side recessed part 121a-121c 4th thru | or 6th support surface

Claims (7)

An engine,
A cylindrical first exhaust treatment device disposed along a predetermined direction and treating exhaust from the engine;
A first support for supporting the first exhaust treatment device;
With
The first exhaust treatment device includes a first contact part formed on the side surface and in contact with the first support part,
The first abutting portion has first to third abutting surfaces perpendicular to a radial direction centering on an axis of the first exhaust treatment device,
The first support portion includes a first recess portion on which the first contact portion is placed,
The first recess has first to third support surfaces with which the first to third contact surfaces come into contact.
Hydraulic excavator. The first to third contact surfaces coincide with a regular octagonal or regular hexagonal outer shape centered on the axis.
The hydraulic excavator according to claim 1. A second support part for supporting the first exhaust treatment device;
The first exhaust treatment device includes a second contact part formed on the side surface and in contact with the second support part,
The second contact portion is separated from the first contact portion in a direction in which the axis extends.
The second contact portion has fourth to sixth contact surfaces perpendicular to the radial direction,
The second support plate includes a second recess portion on which the second contact portion is placed,
The second recess has fourth to sixth support surfaces with which the fourth to sixth contact surfaces come into contact.
The hydraulic excavator according to claim 1 or 2. The fourth to sixth contact surfaces coincide with a regular octagonal or regular hexagonal outer shape centered on the axis;
The hydraulic excavator according to claim 3. A cylindrical second exhaust treatment device disposed along the predetermined direction for treating exhaust from the engine;
The first support part includes a curved concave part on which the second exhaust treatment device is placed,
The curved recess has a curved support surface with which the second exhaust treatment device comes into contact.
The hydraulic excavator according to any one of claims 1 to 4. The contact portion is formed in an annular shape around the axis of the first exhaust treatment device,
The contact portion has a plurality of contact surfaces including the first to third contact surfaces.
The hydraulic excavator according to any one of claims 1 to 5. The contact portion is provided at a portion received by the support portion of the first exhaust treatment device.
The hydraulic excavator according to any one of claims 1 to 6.

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