JP2012117249A - Hydraulic excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic excavator to which an exhaust gas after-treatment device can be easily attached and detached even if the hydraulic excavator has a small length in the vehicle body longitudinal direction, for example, like a rearward small-turning hydraulic excavator.SOLUTION: A rearward small-turning hydraulic excavator 1 is equipped with: an exhaust gas after-treatment device 20 which decreases the particulate material contained in the exhaust gas of an engine 6; a counter weight 5 having a notch 5a; cover members 33, 34 capable of opening and closing relative to the counter weight 5; a step portion 24 on which the end parts of the cover members 33, 34 are mounted when they are closed; a frame member 31 disposed nearly vertically above the exhaust gas after-treatment device 20; and a notch 24a which is formed in a part of the step portion 24, and near which an end part of the exhaust gas after-treatment device 20 passes when the exhaust gas after-treatment device 20 is attached or detached.

Description

  The present invention relates to a hydraulic excavator equipped with an exhaust gas aftertreatment device in the vicinity of a boundary portion between an engine room and a counterweight.

In recent years, construction machines such as hydraulic excavators are equipped with an exhaust gas aftertreatment device for removing particulate matter contained in engine exhaust gas in order to comply with exhaust gas regulations.
For example, Patent Document 1 discloses an exhaust gas aftertreatment device including a diesel particulate filter, a selective reduction catalyst, and the like for a large hydraulic excavator accommodated in a recess of a counterweight.

However, the conventional hydraulic excavator has the following problems.
That is, in the hydraulic excavator disclosed in the above publication, the exhaust gas aftertreatment device including the diesel particulate filter is mounted in the recess of the counterweight. In the hydraulic excavator having a small counterweight, it is difficult to mount the exhaust gas aftertreatment device at the same position as the large excavator disclosed in the above publication due to space problems. Therefore, it is necessary to provide an exhaust gas aftertreatment device on the engine room side. However, the exhaust gas aftertreatment device is housed in the engine room because the rear visibility deteriorates when it protrudes upward from the engine room.

  On the other hand, the exhaust gas aftertreatment device needs to be attached to and detached from the vehicle body by lifting it with a crane for maintenance or the like. Further, as described above, the exhaust gas aftertreatment device is housed in the engine room, and since there is a frame member constituting the engine room above the exhaust gas aftertreatment device, a part of the exhaust gas aftertreatment device is attached to the frame member at the time of attachment / detachment There is a risk of interference.

  An object of the present invention is to easily attach and detach an exhaust gas aftertreatment device even for a hydraulic excavator having a small vehicle body length in the longitudinal direction of the vehicle body, such as a small rear-turning hydraulic excavator. It is to provide a possible hydraulic excavator.

  A hydraulic excavator according to a first aspect of the invention is a rear small turning type hydraulic excavator in which the amount of the end of the counterweight that protrudes from the lower traveling body during turning is a predetermined ratio or less with respect to the width of the lower traveling body, The vehicle body portion, the exhaust gas aftertreatment device, the counter weight, the cover member, the step portion, the frame member, and the structural discontinuity portion are provided. The car body is equipped with an engine. The exhaust gas aftertreatment device is disposed adjacent to the engine and reduces particulate matter contained in the exhaust gas of the engine. The counterweight is attached to the rear part of the vehicle body part and has a substantially U-shaped shape having a recess on the vehicle body part side. The cover member covers the upper open space of the recess and is attached in a state that can be opened and closed with respect to the counterweight. The step portion is formed along the inner wall surface of the concave portion of the counterweight, and the end portion is placed when the cover member is closed. The frame member is attached to the vehicle body, and is disposed substantially vertically above the exhaust gas aftertreatment device. The structural discontinuous part is provided in a part of the step part formed obliquely with respect to the front-rear direction of the vehicle body part.

Here, in the rear small turning type hydraulic excavator equipped with the exhaust gas aftertreatment device, the storage space of the engine room is limited, and the frame member is arranged directly above the exhaust gas aftertreatment device. In order to make it possible to easily attach and detach the exhaust gas aftertreatment device during maintenance or the like, the following configuration is adopted.
The front-rear direction of the vehicle body means a front-rear direction with the front face of the operator sitting in the cab of the excavator as the front direction. The exhaust gas aftertreatment device is a filter device that reduces particulate matter contained in engine exhaust gas. Here, the exhaust gas suspended by a crane or the like when the exhaust gas aftertreatment device is attached or detached. The main body part of the gas aftertreatment device, and the piping connecting the main body part and the engine are included. The step portion is formed along the vicinity of the upper end portion of the inner wall surface of the counterweight recess. For example, when the cover member is closed, the upper surface of the cover member and the upper surface of the counterweight are flat. Form. The structural discontinuity is a structurally discontinuous portion in a direction perpendicular to the cross section of the stepped portion, and is formed by cutting out a part of the stepped portion, for example. Alternatively, a plurality of stepped portions may be formed between the stepped portions.

  In the hydraulic excavator of the present invention, since the frame member is disposed immediately above the exhaust gas aftertreatment device, even if the exhaust gas aftertreatment device is lifted as it is using a crane or the like, it interferes with the frame member. Therefore, in the present invention, in order to avoid such interference with the frame member, the exhaust gas aftertreatment device is slid to a predetermined position in the engine room, and then the exhaust gas aftertreatment device is lifted and removed. To do.

At this time, in the rear small turning type excavator, in order to avoid interference with the counterweight, it is preferable that the moving distance in the horizontal direction of the exhaust gas aftertreatment device is as short as possible.
Therefore, in the hydraulic excavator of the present invention, it is necessary for the exhaust gas aftertreatment device to pass through a part of the step formed obliquely with respect to the longitudinal direction of the vehicle body along the inner wall surface of the counterweight recess. Structural discontinuities are provided to ensure a safe space. Moreover, the structural discontinuity is not conspicuous in appearance because the cover member is covered.

As a result, a structural discontinuity for securing the space necessary for passing the exhaust gas aftertreatment device, even when the space in the engine room is limited, such as a hydraulic excavator of a small rear turning type The exhaust gas aftertreatment device can be slid in the engine room and then lifted and removed using a crane or the like.
As a result, a relatively large device such as an exhaust gas aftertreatment device can be efficiently arranged in the engine room and can be easily attached and detached.

  A hydraulic excavator according to a second aspect of the invention is the hydraulic excavator according to the first aspect of the invention, and is a partition plate that partitions a first end portion on the front side of a vehicle body portion in an exhaust gas aftertreatment device and an engine room on which the engine is mounted. The distance in the front-rear direction of the vehicle body between the first end in the exhaust gas aftertreatment device and the distance in the front-rear direction of the vehicle body between the second end opposite to the first end and the structural discontinuity Almost equal. Further, the distance between the third end of the exhaust gas aftertreatment device disposed below the frame member and the frame member is structurally different from the fourth end of the exhaust gas aftertreatment device opposite to the third end. It is substantially equal to the distance in the left-right direction perpendicular to the front-rear direction of the vehicle body part between the discontinuous parts.

Here, the movement distances required for sliding the exhaust gas aftertreatment device in the engine room when the exhaust gas aftertreatment device is attached and detached are specified in the front-rear direction and the left-right direction, respectively.
The exhaust gas aftertreatment device has a longitudinal direction arranged along the longitudinal direction of the vehicle body, the first end is the front end of the exhaust gas aftertreatment device, and the second end is the rear of the exhaust gas aftertreatment device. Each means an end. Further, the short side direction of the exhaust gas aftertreatment device is arranged along the left-right direction of the vehicle body, the third end portion is an end portion on the interference side with respect to the frame member of the exhaust gas aftertreatment device, and the fourth end portion is exhausted. The end part on the opposite side to the end part (third end part) on the interference side of the gas aftertreatment device is meant.

Thus, in the state where the exhaust gas aftertreatment device is mounted in the engine room, the vehicle body is moved in the horizontal direction by the distance in the front-rear direction between the second end portion and the structural discontinuity portion in the front-rear direction of the vehicle body. In the left-right direction, it can be moved by a distance that can eliminate interference between the exhaust gas aftertreatment device and the frame member in plan view.
As a result, the exhaust gas aftertreatment device can be efficiently arranged in the engine room and can be easily attached and detached while utilizing the area of the engine room to the minimum.

A hydraulic excavator according to a third aspect of the invention is the hydraulic excavator according to the first or second aspect of the invention, wherein the cover member includes an engine hood that covers an open space above the engine room, and an exhaust gas aftertreatment device. And a cover that covers the open space.
Here, in the above-described rear small turning type hydraulic excavator, in order to improve the rear visibility, a member such as an engine hood is also formed in a flat plate shape so as to be flat with respect to the upper surface of the counterweight.
For this reason, the flat cover member is less rigid than the box-shaped cover member, so it is difficult to form a single large member that covers the engine room and the exhaust gas aftertreatment device installation part. .

Here, since the flat cover member that covers the engine room or the like is provided separately for the engine hood and the cover, a minimum rigidity can be secured even with a flat cover member having low rigidity.
Further, since the cover member is divided and provided in this way, the above-described lifting after the slide movement is performed even when the frame member is arranged at the joint portion and arranged immediately above the exhaust gas aftertreatment device. Thus, it can be avoided that the frame member interferes and the exhaust gas aftertreatment device cannot be attached or detached.

A hydraulic excavator according to a fourth invention is the hydraulic excavator according to the third invention, and both the engine hood and the cover are formed of flat plates.
Here, the engine hood and the cover are formed of flat members.
As a result, the rear visibility of the operator can be improved in the rear small turning type hydraulic excavator. Further, the reduction in rigidity due to the flat plate member can ensure the minimum rigidity by dividing the cover member as described above.

A hydraulic excavator according to a fifth invention is the hydraulic excavator according to any one of the first to fourth inventions, wherein the structural discontinuous portion is disposed obliquely with respect to the front-rear direction in the stepped portion. It is provided in the part.
Here, a structural discontinuous portion is provided at a portion formed obliquely with respect to the front-rear direction of the vehicle body among the stepped portions formed along the inner peripheral surface of the concave portion of the counterweight.
Thereby, since it is not necessary to cut out a part of the counterweight in order to provide the structural discontinuity portion, it is possible to avoid a decrease in the weight of the counterweight.

A hydraulic excavator according to a sixth invention is the hydraulic excavator according to any one of the first to fifth inventions, wherein the structural discontinuity is formed by cutting out a part of the stepped portion. It is a missing part.
Thereby, a structural discontinuous part can be provided with a simple configuration.

  A hydraulic excavator according to a seventh aspect of the present invention includes a vehicle body portion, an exhaust gas aftertreatment device, a counterweight, a cover member, a step portion, a frame member, and a structural discontinuity portion. The car body is equipped with an engine. The exhaust gas aftertreatment device is disposed adjacent to the engine and reduces particulate matter contained in the exhaust gas of the engine. The counterweight is attached to the rear part of the vehicle body part and has a substantially U-shaped shape having a recess on the vehicle body part side. The cover member covers the upper open space of the recess and is attached in a state that can be opened and closed with respect to the counterweight. The step portion is formed along the inner wall surface of the concave portion of the counterweight, and is placed when the cover member is closed. The frame member is attached to the vehicle body, and is disposed substantially vertically above the exhaust gas aftertreatment device. The structural discontinuous part is provided in a part of the step part formed obliquely with respect to the front-rear direction of the vehicle body part.

Here, in a hydraulic excavator equipped with an exhaust gas aftertreatment device, for example, the storage space of the engine room is limited like a small rear swivel type hydraulic excavator, and a frame member is disposed immediately above the exhaust gas aftertreatment device. Even in such a configuration, the following configuration is employed so that the exhaust gas aftertreatment device can be easily attached and detached during maintenance or the like.
The front-rear direction of the vehicle body means a front-rear direction with the front face of the operator sitting in the cab of the excavator as the front direction. The exhaust gas aftertreatment device is a filter device that reduces particulate matter contained in engine exhaust gas in order to comply with exhaust gas regulations. Here, the exhaust gas aftertreatment device is attached and detached. In addition, a main body of an exhaust gas aftertreatment device that is suspended by a crane or the like and a pipe connected to the main body are also included. The stepped portion is a protrusion formed along the vicinity of the upper end of the inner wall surface of the concave portion of the counterweight. For example, when the cover member is closed, the upper surface of the cover member and the upper surface of the counterweight Forms a flat surface. And the said structural discontinuity part may be formed by notching a part of said level | step-difference part, for example, or may be formed between the level | step-difference part provided in multiple numbers and the level | step-difference part.

  In the hydraulic excavator of the present invention, since the frame member is disposed immediately above the exhaust gas aftertreatment device, even if the exhaust gas aftertreatment device is lifted as it is using a crane or the like, it interferes with the frame member. Therefore, in the present invention, in order to avoid such interference with the frame member, the exhaust gas aftertreatment device is slid to a predetermined position in the engine room, and then the exhaust gas aftertreatment device is lifted and removed. To do.

At this time, for example, in a small rear swivel excavator, it is preferable that the movement distance of the exhaust gas aftertreatment device in the horizontal direction is as short as possible in order to avoid interference with the counterweight.
Therefore, the hydraulic excavator of the present invention is necessary for passing the exhaust gas aftertreatment device through a part of the step portion formed obliquely with respect to the longitudinal direction of the vehicle body along the inner wall surface of the counterweight recess. Structural discontinuities are provided to ensure a safe space. Moreover, the structural discontinuity is not conspicuous in appearance because the cover member is covered.

Thus, for example, even when the space in the engine room is limited, such as a small rear swivel excavator, a structural insufficiency for securing the space necessary for passing the exhaust gas aftertreatment device is not obtained. The continuous portion is provided in a part of the stepped portion, and the exhaust gas aftertreatment device is slid in the engine room, and then lifted and detached using a crane or the like.
As a result, a relatively large device such as an exhaust gas aftertreatment device can be efficiently arranged in the engine room and can be easily attached and detached.

  According to the hydraulic excavator of the present invention, a relatively large device such as an exhaust gas aftertreatment device can be easily mounted and removed while being efficiently arranged in the engine room.

The side view which shows the structure of the external appearance of the hydraulic shovel which concerns on one Embodiment of this invention. The top view which shows the hydraulic shovel of FIG. (A) is a top view which shows the structure of the boundary part vicinity of the counterweight and engine room in the hydraulic shovel of FIG. (B) is a simplified diagram showing an engine hood and a cover. AA arrow directional cross-sectional view of Fig.3 (a). The rear view which shows the structure of the boundary part vicinity of the counterweight and engine room in the hydraulic shovel of FIG. The conceptual diagram which shows the state which closed the cover which covers the exhaust-gas aftertreatment apparatus of Fig.3 (a). The rear view which shows the structure of the boundary part vicinity of the counterweight and engine room in the hydraulic shovel which concerns on other embodiment of this invention.

A hydraulic excavator 1 according to an embodiment of the present invention will be described below with reference to FIGS.
The “front-rear direction” and “left-right direction” used in the following description are the “front-rear direction”, “the front-rear direction”, "Left-right direction" shall be shown.

[Configuration of hydraulic excavator 1 as a whole]
As shown in FIGS. 1 and 2, the hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, a swivel base 3, a work implement 4, a counterweight 5, an engine 6, an equipment room 9, The cab 10 is provided. The hydraulic excavator 1 has a rear end turning radius within 120% of the width B of the lower traveling body 2 and a minimum front turning radius exceeding 120% so that safety behind the vehicle body is ensured during turning. This is a hydraulic excavator of the so-called rear small turning type (defined by Japanese Industrial Standards (JIS A 8340-4)).

The lower traveling body 2 has the crawler belt P wound around the left and right end portions in the traveling direction to rotate the hydraulic excavator 1 forward and backward, and the swivel base 3 is mounted on the upper surface side in a swingable state. .
The swivel base 3 can be swung in any direction around the swivel center O on the lower traveling body 2, and has a work machine 4, a counterweight 5, an engine 6, and a cab 10 on the upper surface. is doing. The configuration around the exhaust gas aftertreatment device 20 (see FIG. 3A) disposed at the boundary portion between the space (engine room 11) on which the engine 6 is mounted on the swivel base 3 and the counterweight 5. Will be described in detail later.

The work implement 4 is configured to include a boom, an arm attached to the tip of the boom, and a bucket attached to the tip of the arm. While moving the arm, bucket, and the like up and down by a hydraulic cylinder, Work at the site of civil engineering work where excavation of earth and sand and gravel.
The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and hardened. The counterweight 5 is attached to the rear end of the swivel base 3 to balance the vehicle body during mining. Is provided. Further, as shown in FIG. 3A, the counterweight 5 has a concave portion 5 a that is notched in a concave shape on the side facing the engine room 11.

The engine 6 is a drive source for driving the lower traveling body 2 and the work machine 4, and is disposed in the engine room 11 adjacent to the counterweight 5.
The equipment room 9 is disposed on the side of the work machine 4 and houses a fuel tank, a hydraulic oil tank, an operation valve, and the like (not shown).
The cab 10 is a driver's cab in which an operator of the excavator 1 gets on and off, and is disposed on the left front side on the swivel 3 so that the tip of the work machine 4 can be seen. .

[Structure around the exhaust gas aftertreatment device 20]
In the hydraulic excavator 1 of this embodiment, as shown in FIG. 2, an exhaust gas aftertreatment device 20 is provided in the vicinity of the boundary portion between the recess 5 a of the counterweight 5 and the engine room 11.
The exhaust gas aftertreatment device 20 is mounted as an aftertreatment device that reduces particulate matter contained in the exhaust gas of the engine 6, and the main body of the exhaust gas aftertreatment device 20 as shown in FIG. A section 20a and a pipe 21 are provided.

  The pipe 21 is connected to the engine pipe 6 a of the engine 6, and takes in the exhaust gas discharged from the engine 6 into the exhaust gas aftertreatment device 20. The pipe 21 is joined to the engine pipe 6a by bolting, and when the exhaust gas aftertreatment device 20 described later is lifted by a crane or the like for maintenance or the like, the body 21 and the exhaust gas aftertreatment device 20 are mounted on the vehicle body. It is taken out. Further, as shown in FIG. 5, the pipe 21 is arranged so that a frame member 31 described later is positioned in the vertical direction in a state where the pipe 21 is installed on the swivel base 3. For this reason, when the exhaust gas aftertreatment device 20 is taken out from the vehicle body, it is necessary to lift the exhaust gas aftertreatment device 20 after sliding it in the engine room 11 so that the pipe 21 and the frame member 31 do not interfere with each other. is there. The removal of the exhaust gas aftertreatment device 20 will be described in detail later.

In the hydraulic excavator 1 of the present embodiment, the relatively large exhaust gas aftertreatment device 20 is efficiently disposed in the concave portion 5a of the counterweight 5, and the exhaust gas aftertreatment device 20 is smoothly moved out of the vehicle body during maintenance or the like. The following configuration is provided so that it can be removed.
Specifically, as shown in FIGS. 3 (a), 3 (b), and 4, the step portion 24, the frame member 31, the partition plate 32, the cover (cover) Member) 33 and an engine hood (cover member) 34 are provided.

  As shown in FIG. 3A, the stepped portion 24 is formed at a position that is lower than the upper surface of the counterweight 5 by a predetermined distance along the inner peripheral surface side of the concave portion 5 a of the counterweight 5. It protrudes toward the inside of the counterweight 5 in the direction (see FIG. 6). And the edge part of the cover 33 which covers the upper space of the exhaust-gas aftertreatment apparatus 20 is mounted in the level | step-difference part 24, as shown in FIG.3 (b). Further, the step portion 24 has a notch (structural discontinuity portion) 24a in a part thereof.

  The notch 24a is provided so as to allow a part of the exhaust gas aftertreatment device 20 to pass through when the exhaust gas aftertreatment device 20 (to be described later) is slid in the engine room 11 to take it out of the vehicle body. It is the concave part formed in the predetermined position. As shown in FIG. 3A, the notch 24a is formed in a part of the step portion 24 disposed along the direction inclined by the angle θ with respect to the longitudinal direction of the vehicle body.

  As shown in FIG. 3B, the frame member 31 is a frame that is placed with the cover members (cover 33, engine hood 34) covering the concave portion 5a of the counterweight 5 being closed, It is attached along the longitudinal direction of the car body. More specifically, the frame member 31 is disposed along a portion where the cover 33 and the engine hood 34 are adjacent to each other. When both the cover members are closed, the end portions of the both cover members are respectively located on the frame member 31. Placed on top.

  As shown in FIG. 3A, the partition plate 32 is a plate-like member serving as a boundary on the front side of the vehicle body in the engine room 11, and is disposed along the width direction of the vehicle body. That is, the engine room 11 is formed as a space surrounded by the partition plate 32 and the inner peripheral surface of the recess 5 a of the counterweight 5. Here, in the rear small turning type hydraulic excavator such as the hydraulic excavator 1 of the present embodiment, it is necessary to make the rear part of the vehicle body as small as possible. . On the other hand, it is also necessary to mount a relatively large device such as the exhaust gas aftertreatment device 20 in the engine room 11 in a detachable state. For this reason, in this embodiment, the minimum space which can carry out sliding movement of the exhaust-gas aftertreatment apparatus 20 mentioned later is ensured in the engine room 11. FIG.

  The cover 33 is a flat cover member that can be opened and closed to cover the upper space of the exhaust gas aftertreatment device 20 disposed in the recess 5 a of the counterweight 5. When the cover 33 is closed with respect to the vehicle body, the end portion thereof is fully closed with the stepped portion 24 and the frame member 31 being respectively mounted (see the broken line portion in FIG. 3A). ). When the cover 33 is in the fully closed state, as shown in FIG. 4, the upper surface of the counterweight 5 and the upper surface of the cover 33 form a substantially smooth surface. In addition, the cover 33 is not obstructed. Therefore, the rear visibility from the inside of the cab 10 can be improved.

  The engine hood 34 is a part of a cover member that covers the concave portion 5 a of the counterweight 5, and is provided separately from the cover 33 described above. The engine hood 34 is placed on the stepped portion 24 formed along the inner peripheral portion of the concave portion 5a of the counterweight 5 in the closed state, like the cover 33 (the broken line portion in FIG. 3A). reference). The engine hood 34 is formed as a plate-like member, and forms a substantially smooth surface with the upper surface of the counterweight 5 in the closed state. Therefore, similarly to the cover 33, the rear visibility of the operator in the cab 10 is not blocked, and the rear visibility from the cab 10 can be improved.

  Here, in the present embodiment, the cover member that covers the recess 5 a of the counterweight 5 is divided into the cover 33 and the engine hood 34. Thereby, for example, when performing maintenance or the like of the exhaust gas aftertreatment device 20, it is possible to perform work by opening only the cover 33, and conversely, when performing inspection or the like in the engine room 11, Only the engine hood 34 can be opened for operation. Therefore, the operator can perform work by opening only one cover member provided in a divided manner, so that the burden during work can be reduced.

  As described above, the cover 33 and the engine hood 34 provided separately are both formed of plate-like members. Usually, when a cover member is formed of such a plate-like member, there is a demerit that it is inferior in strength as compared with a box-type cover member. However, in the present embodiment, the cover member that has conventionally been one member is divided into the cover 33 and the engine hood 34. For this reason, even if the cover member has a lower strength than before, a sufficient strength can be ensured by limiting the size.

<Removal process of exhaust gas aftertreatment device 20>
Since the excavator 1 of the present embodiment is a small rear turning type, the engine room 11 behind the cab 10 is space-saving. A relatively large exhaust gas aftertreatment device 20 that is required to be attached to and detached from the vehicle body during maintenance or the like is mounted in the engine room 11 of the excavator 1. For this reason, in this embodiment, when the exhaust gas aftertreatment device 20 is disposed in the recess 5a formed in the counterweight 5 in the engine room 11 and the exhaust gas aftertreatment device 20 is removed, the exhaust gas aftertreatment device 20 After sliding horizontally in the engine room 11 to a predetermined position (see broken line 20 in FIG. 3A) in order to avoid interference with the frame member 31 and the like of the processing device 20 (pipe 21). Then, hang it with a crane and remove it from the car body.

Here, the slide movement of the exhaust gas aftertreatment device 20 is preferably as small as possible in order to avoid interference with the counterweight 5.
Therefore, in the present embodiment, the inside of the recess 5a of the counterweight 5 can be moved to a predetermined position where the exhaust gas aftertreatment device 20 and other members do not interfere with each other with a movement amount as small as possible. A notch 24a is provided by notching a part of the stepped portion 24 formed along the peripheral surface.

Specifically, when the exhaust gas aftertreatment device 20 is removed, as shown in FIG. 3A, the movement amount X in the vehicle body width direction (vertical direction in FIG. 3A) and the vehicle body front-rear direction. The exhaust gas aftertreatment device 20 is slid in the amount of movement Y in the left-right direction in FIG.
Here, the movement amount X is defined as a movement amount larger than the minimum movement amount X1 (where X> X1) necessary to avoid interference between the frame member 31 installed immediately above and the pipe 21. . On the other hand, the amount of movement Y corresponds to the end of the exhaust gas aftertreatment device 20 generated when the exhaust gas aftertreatment device 20 is slid by the amount of movement X in the width direction of the vehicle body and the inner wall surface of the recess 5a of the counterweight 5. Is defined as a minimum movement amount Y1 (where Y> Y1) necessary to avoid the interference.

Note that the movement amounts X and Y are calculated by the following relational expression (1), where the inclination angle θ with respect to the vehicle body longitudinal direction of the stepped portion 24 in which the notch 24a is formed.
tan θ = X / Y (1)
From the above, in this embodiment, in the front-rear direction of the vehicle body, the distance between the partition plate 32 and the front side end (first end) of the exhaust gas aftertreatment device 20 is ensured by a movement amount Y or more. The arrangement position of the exhaust gas aftertreatment device 20 is determined. Then, the exhaust gas aftertreatment device 20 is moved by a movement amount Y in the longitudinal direction of the vehicle body, and the movement amount X necessary for avoiding the interference between the pipe 21 (third end) and the frame member 31 is A part of the stepped portion 24 that interferes with a portion where the rear end (second end) and the side end (fourth end) intersect with each other when the exhaust gas aftertreatment device 20 is moved in the width direction. Is provided with a notch 24a.

As a result, in the rear small swivel excavator 1, the exhaust gas aftertreatment device 20 can be efficiently disposed at a position adjacent to the engine 6, and the exhaust gas aftertreatment device 20 is merely slid by a predetermined amount. Thus, the attachment and detachment can be easily performed.
Further, in the hydraulic excavator 1 of the present embodiment, only a part of the stepped portion 24 is cut out as a space through which the exhaust gas aftertreatment device 20 is lifted, and the counterweight 5 itself is not cut out. For this reason, the above-described effect can be obtained without losing the left and right weight balance of the counterweight 5.
Further, the stepped portion 24 that is partially cut away as a space through which the exhaust gas aftertreatment device 20 is lifted is not exposed on the surface of the vehicle body. For this reason, the above-described effect can be obtained without impairing the appearance of the vicinity of the counterweight 5 of the excavator 1.

[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)
In the above embodiment, the frame member 31 is provided immediately above the pipe 21 of the exhaust gas aftertreatment device 20, and the pipe 21 and the frame member 31 interfere when the exhaust gas aftertreatment device 20 is lifted as it is. The configuration has been described as an example. However, the present invention is not limited to this.

For example, as shown in FIG. 7, an arrangement configuration in which a frame member 31 is arranged immediately above the main body 20 a of the exhaust gas aftertreatment device 20 may be employed.
Even in this case, as in the above embodiment, after the exhaust gas aftertreatment device 20 is slid to a predetermined position where the pipe 21 and the frame member 31 do not interfere, the exhaust gas aftertreatment device 20 is lifted by a crane or the like. Thus, the same effect as described above can be obtained.

(B)
In the said embodiment, the example which applied this invention with respect to the hydraulic excavator 1 of the back small turning type was given and demonstrated. However, the present invention is not limited to this.
For example, the present invention can be applied not only to the small rear turning type but also to a small-sized or medium-sized hydraulic excavator having a short vehicle body length in the longitudinal direction of the vehicle body.

(C)
In the above embodiment, a part of the stepped portion 24 is used as a structural discontinuity for securing a space through which the exhaust gas aftertreatment device 20 that has been slid to a predetermined position in the engine room 11 is lifted. An example in which the cutout 24a is used has been described. However, the present invention is not limited to this.

  As the structural discontinuous portion, for example, a gap between a plurality of step portions provided along the inner wall surface of the concave portion of the counterweight 5 may be used in addition to the notch 24a.

  The present invention produces an effect that a relatively large device such as an exhaust gas aftertreatment device is efficiently arranged in the engine room and can be easily attached and detached. It can be widely applied to various work vehicles equipped with an exhaust gas aftertreatment device.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Swivel base 4 Working machine 5 Counterweight 5a Recess 6 Engine 6a Engine piping 7 Slide door 9 Equipment room 10 Cab 11 Engine room 20 Exhaust gas aftertreatment device 20a Main body part 21 Piping 24 Step part 24a Cutting Notch (structural discontinuity)
31 Frame member 32 Partition plate 33 Cover (cover member)
34 Engine hood (cover member)
B Width O Turning center P Track C Radius X, Y Travel distance

JP 2008-156835 A (published July 10, 2008)

Claims (7)

A rear small swing type hydraulic excavator in which the amount of the end of the counterweight that protrudes from the lower traveling body when turning is a predetermined ratio or less with respect to the width of the lower traveling body,
The vehicle body where the engine is mounted,
An exhaust aftertreatment device disposed adjacent to the engine to reduce particulate matter contained in the exhaust gas of the engine;
A frame member attached to the vehicle body and disposed substantially vertically above the exhaust gas aftertreatment device;
A counterweight attached to the rear portion of the vehicle body portion and having a recess cut out on the vehicle body portion side;
A cover member that covers the upper open space of the recess and is attached to the counterweight in an openable / closable state;
A stepped portion formed along the inner wall surface of the concave portion of the counterweight, the end portion of which is placed when the cover member is closed;
A structural discontinuity provided in a part of the step formed obliquely with respect to the front-rear direction of the vehicle body,
A hydraulic excavator equipped with. The distance in the front-rear direction of the vehicle body between the first end on the front side of the vehicle body in the exhaust gas aftertreatment device and the partition plate that partitions the engine room on which the engine is mounted is the exhaust gas aftertreatment. A distance in the front-rear direction of the vehicle body between the second end opposite to the first end of the device and the structural discontinuity;
The distance between the third end of the exhaust gas aftertreatment device disposed below the frame member and the frame member is the fourth end of the exhaust gas aftertreatment device opposite to the third end. Approximately equal to the distance in the left-right direction perpendicular to the front-rear direction of the vehicle body part between the structural discontinuity part and
The hydraulic excavator according to claim 1. The cover member has an engine hood that covers an open space above the engine room, and a cover that covers an open space above the exhaust gas aftertreatment device.
The hydraulic excavator according to claim 1 or 2. The engine hood and the cover are both formed by flat plates.
The hydraulic excavator according to claim 3. The structural discontinuity is provided in a portion arranged obliquely with respect to the front-rear direction in the stepped portion,
The hydraulic excavator according to any one of claims 1 to 4. The structural discontinuity is a notch formed by notching a part of the step.
The hydraulic excavator according to any one of claims 1 to 5. The vehicle body where the engine is mounted,
An exhaust aftertreatment device disposed adjacent to the engine to reduce particulate matter contained in the exhaust gas of the engine;
A counterweight attached to the rear portion of the vehicle body portion and having a recess cut out on the vehicle body portion side;
A cover member that covers the upper open space of the recess and is attached to the counterweight in an openable / closable state;
A stepped portion that is formed along the inner wall surface of the recess of the counterweight, and is placed when the cover member is closed;
A frame member attached to the vehicle body and disposed substantially vertically above the exhaust gas aftertreatment device;
A structural discontinuity provided in a part of the step formed obliquely with respect to the front-rear direction of the vehicle body,
A hydraulic excavator equipped with.

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