JP2002089380A - Construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To purify the air to be sucked into an engine without frequently performing the maintenance of an air cleaner. SOLUTION: A dust guide plate 24 is provided so as to partition between an intake air port 14C and a dust discharge port 14D of a casing 14 in a lower side of a centrifugal air cleaner 13 provided inside of a building cover 8. This dust guide plate 24 is provided with an inclined surface 24B for leading the dust D discharged outside from the dust discharge port 14D to a lower side of a turning frame 5. With this structure, the dust D separated from the air sucked into the casing 14 and discharged from the dust discharge port 14D is led to the lower side of the turning frame 5 by the dust guide plate 24, and discharged out of a car body. Contamination of the air to be sucked into the casing 14 from the intake air port 14C with the dust D discharged outside is thereby restricted, and the clean air can be supplied to an engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic shovel and a hydraulic crane, and more particularly to a construction machine having an air cleaner for purifying air sucked into an engine.

[0002]

2. Description of the Related Art In general, a construction machine such as a hydraulic excavator or a hydraulic crane is provided with a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a vertically movable upper revolving body. And a working device.

[0003] An engine is provided on a revolving frame constituting the upper revolving superstructure, and an air cleaner for separating dust contained in air and supplying clean air to the engine is connected to an intake side of the engine. Have been.

Here, a centrifugal air cleaner is known as an air cleaner according to the prior art. The centrifugal air cleaner has an air inlet for sucking air and a dust outlet for discharging dust in the sucked air to the outside. And a filter element provided in the casing and connected to an intake pipe of the engine.

The centrifugal type air cleaner centrifugally separates dust in the air sucked into the casing from an intake port and discharges the dust to the outside of the casing from a dust discharge port. The clean air is supplied to the engine by being captured by the element.

[0006]

The above-described engine, air cleaner and the like are provided in a building cover provided on a revolving frame, and a space formed below the air cleaner in the building cover is provided. Usually, devices such as relatively small electric parts and device cases that cover these devices are provided.

[0007] However, the above-mentioned centrifugal air cleaner usually has a structure in which a dust discharge port is provided downward, and dust centrifugally separated from air in the casing is discharged downward through the dust discharge port. I have. Therefore, for example, when an equipment case or the like is disposed by utilizing a space formed below the air cleaner, dust emitted from a dust emission port of the air cleaner accumulates on an upper surface of the equipment cover and the like. This dust mixes again into the air sucked into the air cleaner from the intake port when the engine is operating, and returns to the air cleaner.

As a result, a large amount of dust is sucked into the air cleaner during operation of the engine, and the filter element is clogged at an early stage. Therefore, maintenance work of the air cleaner such as cleaning and replacement of the filter element is frequently performed. There is a problem that must be.

The present invention has been made in view of the above-described problems of the prior art, and provides a construction machine capable of purifying air sucked into an engine without frequently performing maintenance work on an air cleaner. It is intended to be.

[0010]

In order to solve the above-mentioned problems, the present invention relates to a frame structure constituting a vehicle body, an engine provided on the frame structure, and an engine connected to an intake side of the engine. The present invention is applied to a construction machine provided with an air cleaner that is provided at a predetermined position and separates dust contained in air to supply clean air to an engine.

A feature of the structure adopted by the invention of claim 1 is that the air cleaner has a casing having a suction port for sucking air and a dust discharge port for discharging dust in the sucked air to the outside, And a filter element provided in the engine and connected to an intake pipe of the engine, and a dust guide for guiding the dust discharged from a dust discharge port of the casing toward the outside of the vehicle body on the frame structure side. I have provided a board.

With this configuration, when the engine is operated and air is sucked into the intake port of the air cleaner, the dust contained in the air is separated from the air by the air cleaner, and the dust outside the air cleaner is discharged through the dust discharge port. Will be released. At this time, the dust discharged from the air cleaner is guided to the outside of the vehicle body by the dust guide plate provided on the frame structure side, so that the dust is prevented from being mixed into the air sucked into the air cleaner from the intake port again. be able to. Therefore, the amount of dust sucked into the air cleaner can be reduced, and the frequency of maintenance work on the air cleaner can be reduced.

According to a second aspect of the present invention, the dust guide plate is provided with an inclined surface for guiding the dust discharged from the dust discharge port of the cleaner toward the lower side of the frame structure.

According to this structure, the dust discharged from the dust discharge port of the air cleaner can be guided to the lower side of the frame structure along the inclined surface of the dust guide plate.

According to a third aspect of the present invention, the intake port and the dust discharge port of the air cleaner are provided downward, and the dust guide plate is arranged so as to partition between the intake port and the dust discharge port.

With this configuration, the dust discharged from the dust discharge port of the air cleaner can be separated from the intake port by the dust guide plate, and this dust mixes with the air sucked from the intake port again. Thus, it is possible to suppress the return to the inside of the air cleaner.

According to a fourth aspect of the present invention, a device case is provided on the frame structure below the air cleaner and covers the devices, and the dust guide plate is provided by using the device case. .

According to a fifth aspect of the present invention, the frame structure is provided with an under cover for closing the lower surface thereof, and the dust guided by the dust guide plate is provided between the under cover and the frame structure. The configuration is such that a gap is provided below the body for discharging.

With this configuration, the dust discharged from the dust discharge port of the air cleaner is guided to the lower side of the frame structure along the inclined surface of the dust guide plate.
The air can be discharged to the lower side of the frame structure through a gap between the frame structure and the under cover.

According to a sixth aspect of the present invention, there is provided a structure in which a dust guide pipe for guiding dust discharged from the dust discharge port toward the outside of the vehicle body is provided at the dust discharge port of the casing.

[0021] With this configuration, the dust discharged from the dust discharge port is introduced into the dust guide tube without diffusing around the dust discharge port. It can be discharged out of the vehicle body through a pipe.

According to a seventh aspect of the present invention, the frame structure is provided with an undercover for closing the lower surface thereof, and the dust guide tube has a base end connected to the dust discharge port of the casing and a tip end provided on the undercover. It is configured to protrude to the outside of the vehicle body through the insertion hole.

With this configuration, the dust introduced into the dust guide tube can be reliably discharged to the outside of the vehicle body through the under cover, and the dust is separated from the air cleaner inside the vehicle body by the under cover. It is possible to suppress a reversal toward.

According to an eighth aspect of the present invention, the dust guide tube is constituted by a flexible hose.

With this configuration, for example, even when various devices are provided around the air cleaner, the dust guide tube is appropriately bent so as not to interfere with the devices, and is thus discharged from the dust discharge port. It can be arranged outside the vehicle body.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine according to an embodiment of the present invention will be described in detail below with reference to FIGS.

FIGS. 1 to 7 show a first embodiment of the present invention. In the drawings, reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 includes a lower traveling body 2 and a lower traveling body 2. The upper revolving body 3 is mounted on the upper revolving body 3 so as to be revolvable, and a working device 4 is provided on the front side of the upper revolving body 3 so as to be able to move up and down.

The revolving superstructure 3 includes a revolving frame 5 as a frame structure, a cab 6 provided on the front left side of the revolving frame 5 to define a driver's cab, and a revolving frame 5.
A fuel tank 7 provided on the front right side of the vehicle, a building cover 8 provided on the rear side of the cab 6 and the fuel tank 7 and covering an engine 10, an air cleaner 13 and the like described later, and a fuel tank 7 provided on the rear side of the building cover 8 And a counter weight 9.

Here, the turning frame 5 is shown in FIGS.
As shown in the figure, a center frame 5A is located at the center in the left and right directions and extends forward and backward.
Left and right side frames 5B, 5B (only the right side is shown) located on the left and right sides of A and extending forward and backward, and the center frame 5 extending left and right from the center frame 5A.
A plurality of overhanging beams 5C and 5D connecting between A and the side frame 5B, and a counterweight mounting plate 5E which is located at the rear end of the center frame 5A and extends leftward and rightward to which the counterweight 9 is mounted. It has a framework structure that includes.

A plurality of engine supporting members 5F, 5F,... For supporting the engine 10, which will be described later, are fixed to the center frame 5A and the counterweight mounting plate 5E, respectively. Radiator supporting members 5G, 5G for supporting a radiator 11, which will be described later, are respectively fixed. Further, between the overhang beam 5D and the counterweight mounting plate 5E, a battery support plate 5H extending forward and backward along the right side frame 5B and supporting a battery 21 described later.
Is fixed.

An engine 10 is mounted on the revolving frame 5 in the building cover 8.
The hydraulic pump is mounted on each engine support member 5F of the revolving frame 5, and drives a hydraulic pump (both not shown) serving as a hydraulic pressure source of a hydraulic actuator mounted on the hydraulic excavator 1.

A radiator 11 is provided near the engine 10 and provided in the building cover 8.
1 is mounted on a radiator support member 5G of the revolving frame 5 in a state of facing the fan 10A of the engine 10. The radiator 11 radiates heat of the engine cooling water circulating between the engine 10 and the cooling air from the fan 10A to cool the engine cooling water.

An intake pipe 12 is connected to an intake port of the engine 10.
And the radiator 11. And
The intake pipe 12 supplies the air cleaned by an air cleaner 13 described later to the engine 10.

13 is attached to the tip of the intake pipe 12,
A centrifugal air cleaner connected to the intake side of the engine 10 through the intake pipe 12;
Is constituted by a casing 14, an air introduction pipe 17, a filter element 18, and the like, which will be described later.

Reference numeral 14 denotes a casing which forms the outer shell of the air cleaner 13. As shown in FIGS. 4 and 5, the casing 14 is formed into a bottomed cylindrical shape as a whole by a cylindrical portion 14A, a bottom portion 14B and the like. And the casing 14
Is fixed to the fuel tank 7 using a band 15 attached to the outer peripheral side of the cylindrical portion 14A, and the tip of the intake pipe 12 is connected to the center of the bottom 14B.

Here, the casing 1 is attached to the cylindrical portion 14A.
A cylindrical intake port 14C for sucking air into the casing 4 and a cylindrical dust discharge port 14D for discharging dust D centrifugally separated from the air sucked into the casing 14 to the outside of the casing 14 are arranged in the axial direction. And project downward. A spiral blade 14E is provided in the cylindrical portion 14A near the intake port 14C.
Is for the air sucked into the casing 14 from the intake port 14C to generate a swirling flow in the casing 14.

When the engine 10 operates, the intake port 1
The air sucked into the casing 14 through the 4C flows along the blades 14E of the casing 14 to generate a swirling flow in the casing 14 as shown by an arrow A in FIG. As a result, the dust D contained in the air is separated from the air by centrifugation, and the engine 10
Is stopped, the dust D is discharged to the outside of the casing 14 through the dust discharge port 14D.

At the tip of the dust discharge port 14D,
A vacuum suction valve 16 made of thin rubber or the like is attached. When the air is sucked into the engine 10 through the intake port 14C during operation of the engine 10, for example, the vacuum suction valve 16 As a result, the discharge port 16A closes (see FIG. 6), the operation of the engine 10 stops, and the inside of the casing 14 becomes positive pressure (atmospheric pressure), so that the discharge port 16A opens (see FIG. 7). Things.

Reference numeral 17 denotes an air introduction pipe connected to the distal end of the intake pipe 12 and extending into the casing 14.
, The air sucked from the intake port 14C of the casing 14 through a large number of ventilation holes 17A, 17A,.
Lead to.

Numeral 18 denotes a filter element accommodated in the casing 14. The filter element 18 extends in the axial direction of the casing 14 by being inserted into the outer peripheral side of the air introducing pipe 17. The filter element 18 captures dust that has not been centrifuged out of the dust contained in the air sucked into the casing 14.

Reference numeral 19 denotes a cover for covering the casing 14.
The lid 19 is connected to the air introducing pipe 1 by using a bolt 20, for example.
7, the casing 14 is covered, and the filter element 18 is prevented from coming off. Therefore, the lid 1
By removing 9, the filter element 18 can be attached to and detached from the air introduction pipe 17.

Reference numerals 21 and 21 denote batteries which are provided near the radiator 11 and are provided in the building cover 8 and serve as power sources for electric components mounted on the hydraulic excavator 1.
1 is mounted on the battery support plate 5H of the turning frame 5, as shown in FIGS.

Reference numeral 22 denotes a relay case, which is located below the air cleaner 13 and is provided in the building cover 8 as an equipment case. The relay case 22 houses electric equipment such as a relay (not shown) therein. To accommodate. Here, the relay case 22 is mounted on the overhang beams 5C and 5D of the turning frame 5, and is disposed between the fuel tank 7 and the battery 21.

The relay case 22 and the turning frame 5
Between the side frame 5B and the side frame 5B
A gap 23 extending forward and backward is formed along the gap, and the gap 23 is for discharging dust discharged from the dust discharge port 14 </ b> D of the air cleaner 13 to the lower side of the turning frame 5.

A dust guide plate 24 is fixed to the upper surface 22A of the relay case 22 by welding or the like and extends upward from the revolving frame 5 toward the air cleaner 13. The dust guide plate 24 is connected to the intake port 14C of the air cleaner 13. It is arranged so as to partition between the dust discharge port 14D.

Here, the dust guide plate 24 is formed by, for example, bending a thin steel plate or the like, and is disposed so as to face a vertical surface 24 A extending vertically upward from the relay case 22 and the building cover 8. An inclined surface 24B is turned obliquely downward from the upper end of 24A toward the upper surface 22A of the relay case 22.

Then, the dust guide plate 24 partitions between the intake port 14C and the dust discharge port 14D of the air cleaner 13, and the dust D discharged from the dust discharge port 14D is
By dropping on the side frame 5B side along the inclined surface 24B of the dust guide plate 24, the revolving frame 5 passes through the gap 23 between the relay case 22 and the side frame 5B without being deposited on the upper surface 22A of the relay case 22. Is discharged to the lower side.

Reference numeral 25 denotes an under cover for closing the lower surface of the revolving frame 5, and the under cover 25 covers the engine 10, the radiator 11, etc. mounted on the revolving frame 5 from below. Here, the right end side of the under cover 25 is attached to, for example, a bracket 26 fixed to the side frame 5B of the turning frame 5, as shown in FIG.

A gap 27 extending forward and backward along the side frame 5B is formed between the right edge of the under cover 25 and the side frame 5B, and the dust D falling through the gap 23 is formed. Can be discharged through the gap 27 below the under cover 25, that is, outside the upper swing body 3. Further, a number of air holes 25A, 25A,... For taking in outside air into the building cover 8 are formed in a portion of the under cover 25 below the air cleaner 13.

The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation of purifying the air sucked into the engine 10 by the air cleaner 13 when the engine 10 operates will be described below.

First, when the engine 10 is operated, the inside of the casing 14 of the air cleaner 13 is in a negative pressure state, and air containing dust D is sucked into the casing 14 from the intake port 14C. At this time, the vacuum suction valve 16 provided on the tip side of the dust discharge port 14D has the discharge port 16A closed as shown in FIG.

The air sucked into the casing 14 generates a swirling flow along the blades 14E of the casing 14, while the filter element 18 and the air introduction pipe 17
Is introduced into the intake pipe 12 through the ventilation hole 17A or the like.

Here, the dust D in the air sucked into the casing 14 is first centrifuged from the air by generating a swirling flow as shown by an arrow A in FIG. Then, it is guided to the dust discharge port 14D while floating inside the casing 14.

On the other hand, dust D that has not been centrifuged in the casing 14 is captured by the filter element 18 when air is introduced into the intake pipe 12 through the filter element 18, the ventilation hole 17 A of the air introduction pipe 17, and the like. Is done. For this reason, the engine 10
The air introduced into the engine 10 can be sufficiently cleaned, and the engine 10 can be protected.

Next, when the operation of the engine 10 is stopped and the pressure in the casing 14 becomes positive (atmospheric pressure), as shown in FIG. 7, the vacuum suction valve 1 attached to the dust discharge port 14D
The discharge port 16A of No. 6 is opened. As a result, the dust D is released to the outside of the casing 14 through the dust discharge port 14D, and falls toward the relay case 22.

Here, on the upper surface 22 A of the relay case 22, the intake port 14 C of the casing 14 and the dust discharge port 14
Since the dust guide plate 24 protrudes in a state of partitioning between the dust guide plate 24 and the dust guide plate 24, the dust D discharged to the outside from the dust discharge port 14 </ b> D
Is guided to the side frame 5B side of the revolving frame 5 along the inclined surface 24B of the dust guide plate 24 without dropping to the side of the intake port 14C. Then, the dust D is discharged to the lower side of the turning frame 5 through a gap 23 formed between the side frame 5B and the relay case 22, and is further formed between the under cover 25 and the side frame 5B. It is discharged below the under cover 25 through the gap 27, that is, outside the upper rotating body 3.

Therefore, dust D separated from the air in the casing 14 of the air cleaner 13 can be prevented from accumulating on the upper surface 22A of the relay case 22. Even if a small amount of dust adheres, the dust D can be isolated from the intake port 14C of the casing 14 by the dust guide plate 24.

As a result, the dust D discharged to the outside of the casing 14 is
When air is sucked into the casing 14 from C, it is possible to reliably prevent the air from being mixed into the air and returning to the inside of the casing 14, so that clean air can always be supplied to the engine 10. Further, it is possible to prevent a large amount of dust D from being sucked into the casing 14 during operation of the engine 10 and to prevent the filter element 18 from being clogged at an early stage, and to perform maintenance work for the air cleaner 13 such as cleaning and replacement of the filter element 18. Frequency can be reduced.

Thus, according to the present embodiment, below the centrifugal separation type air cleaner 13 provided in the building cover 8, the partition between the intake port 14 C and the dust discharge port 14 D of the air cleaner 13 is provided. Since the dust guide plate 24 for guiding the dust discharged from the discharge port 14D to the outside of the upper swing body 3 is provided, the dust separated in the casing 14 of the air cleaner 13 and discharged to the outside of the casing 14 is It is possible to reliably prevent the air from being mixed into the air sucked into the casing 14 again from the intake port 14C and returning to the inside of the casing 14.

As a result, it is possible to prevent a large amount of dust from being sucked into the casing 14 during operation of the engine 10 and the filter element 18 from being clogged at an early stage.
In addition to reducing the frequency of maintenance work on the air cleaner 13 such as cleaning and replacement of the filter element 18, it is possible to always supply clean air to the engine 10 and to reliably protect the engine 10.

Since the dust guide plate 24 is provided with the inclined surface 24B for guiding the dust discharged from the dust discharge port 14D of the air cleaner 13 toward the lower side of the turning frame 5, the dust is released from the dust discharge port 14D. By discharging the dust to the lower side of the revolving frame 5, the dust is reliably prevented from being mixed into the air sucked into the casing 14 from the intake port 14C and sucked into the casing 14 again. The air supplied to the engine 10 can be purified.

Since the dust guide plate 24 is provided in the relay case 22 disposed below the air cleaner 13, the limited space in the building cover 8 can be effectively used.

The turning frame 5 is provided with an under cover 25 for closing the lower surface thereof. Between the side frame 5B and the under cover 25 of the turning frame 5, a forward and rearward direction is provided along the side frame 5B. Is formed, the dust outlet 14D of the air cleaner 13 is formed.
Dust that has been guided from the dust guide plate 24 and has fallen can be discharged through the gap 27 below the under cover 25, that is, outside the upper rotating body 3.

Next, FIGS. 8 and 9 show a second embodiment of the present invention. The feature of this embodiment is that dust discharged from the dust discharge port is supplied to a dust discharge port of an air cleaner. In that a dust guide tube is provided to guide the dust to the outside. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 31 denotes a dust guide hose attached to a dust discharge port 14D of the casing 14 constituting the air cleaner 13. The dust guide hose 31 is constituted by a flexible hose such as a rubber hose.
The dust D discharged from the dust discharge port 14 </ b> D is guided to the outside of the upper rotating body 3.

Here, the proximal end 3 of the dust guide hose 31
1A is inserted into the dust discharge port 14D so as to cover the vacuum suction valve 16, and is fixed to the dust discharge port 14D by a hose band 32. Further, the distal end side 31B of the dust guide hose 31 is a free end and hangs down,
It projects to the lower surface side of the under cover 33 through a hose insertion hole 33A of the under cover 33 described later.

Reference numeral 33 denotes an under cover used in the present embodiment instead of the under cover 25 according to the first embodiment described above. The under cover 33 is a bracket 26 fixed to the side frame 5B of the revolving frame 5. To close the lower surface of the revolving frame 5.

Here, a hose insertion hole 33A having a diameter larger than the outer diameter of the dust guide hose 31 is formed in a portion of the under cover 33 immediately below the dust guide hose 31. A number of ventilation holes 33B, 33B,... For taking in outside air into the building cover 8 are formed in a portion of the under cover 33 below the air cleaner 13.

The dust guide hose 31 is attached to the dust outlet 14D such that the base end 31A covers the vacuum suction valve 16, and the distal end 31B is connected to the hose insertion hole 3D.
It projects to the lower surface side of the under cover 33 through 3A. Thereby, the dust discharge port 14 of the air cleaner 13
Dust discharged from D is introduced into the dust guide hose 31 without diffusing around the dust discharge port 14D, and from the tip side 31B of the dust guide hose 31 to the lower surface side of the under cover 33, that is, the upper swivel. It is configured to be reliably discharged to the outside of the body 3.

This embodiment is provided with the dust guide hose as described above.
The dust D centrifuged in the inside is discharged to the outside of the casing 14 through the dust discharge port 14D when the vacuum suction valve 16 attached to the dust discharge port 14D opens.

Here, since the dust guide hose 31 is connected to the dust discharge port 14D, the discharged dust D is introduced into the dust guide hose 31 without diffusing around the dust discharge port 14D. . And dust D
Falls along the dust guide hose 31 and is discharged from the tip side 31B of the dust guide hose 31 to the lower surface side of the under cover 33, that is, to the outside of the upper rotating body 3.

As described above, in the present embodiment, all the dust D discharged from the air cleaner 13 can be reliably discharged to the outside of the upper revolving unit 3 by using the dust guide hose 31. On the other hand, the dust D discharged to the outside of the upper revolving unit 3 does not return to the inside of the building cover 8 partitioned by the under cover 33, so that the dust D is sucked into the air cleaner 13 in the building cover 8 again. Can be reliably suppressed.

As a result, clean air can always be supplied to the engine 10 via the air cleaner 13, and the filter element 18 of the air cleaner 13 can be prevented from being clogged at an early stage, and the filter element 18 can be cleaned and replaced. It is possible to reduce the frequency of maintenance work on the air cleaner 13 such as.

Further, since the dust guide hose 31 is constituted by a flexible hose, even if various devices such as an engine and a radiator are provided around the air cleaner 13, for example, the dust guide hose 31 can be used. The under cover 3 is flexed as appropriate so as not to disturb the devices, and then is moved from the dust discharge port 14D of the air cleaner 13 to the under cover 3.
3 can be easily disposed in the hose insertion hole 33A.

In the above-described first embodiment, the case where the dust guide plate 24 is provided on the relay case 22 disposed below the air cleaner 13 has been described as an example. The air cleaner is not limited to
A dust guide plate may be provided on the band 15 for attaching the fuel tank 3 to the fuel tank 7, or a dust guide plate may be provided on the fuel tank 7.

Further, in the above-described second embodiment, the dust guide hose 31 made of a rubber hose or the like has been described as an example of the dust guide tube. However, the present invention is not limited to this, and has no flexibility, for example. The dust guide tube may be constituted by a metal pipe or the like.

Further, in each of the above-described embodiments, the hydraulic excavator 1 is taken as an example of a construction machine, but the present invention is not limited to this, and is widely applicable to other construction machines such as a hydraulic crane and a wheel loader. can do.

[0078]

As described above in detail, according to the first aspect of the present invention, the air cleaner connected to the intake side of the engine provided on the frame structure is connected to the intake port for sucking air and the air in the sucked air. A casing having a dust discharge port for discharging dust to the outside, and a filter element provided in the casing; on the frame structure side, dust discharged from the dust discharge port of the casing is disposed outside the vehicle body. Since the dust guide plate is provided to guide the dust toward the air cleaner, it is possible to prevent the dust discharged from the dust discharge port from being mixed into the air sucked from the intake port and sucked into the air cleaner again. Therefore, the amount of dust sucked into the air cleaner can be reduced, the frequency of maintenance work on the air cleaner can be reduced, and in addition, clean air can always be supplied to the engine to protect the engine. Can be.

According to the second aspect of the present invention, the dust guide plate is provided with the inclined surface for guiding the dust discharged from the dust discharge port of the air cleaner toward the lower side of the frame structure. The dust discharged from the dust discharge port of the air cleaner can be discharged to the lower side of the frame structure along the inclined surface of the dust guide plate. Thus, it is possible to reliably prevent the dust discharged from the dust discharge port from being mixed into the air sucked from the ventilation port and returning to the inside of the air cleaner, and to purify the air supplied to the engine.

According to the third aspect of the present invention, the intake port and the dust discharge port of the air cleaner are provided downward, and the dust guide plate is arranged so as to partition between the intake port and the dust discharge port. The dust discharged from the dust discharge port of the air cleaner can be separated from the intake port by the dust guide plate, and this dust is prevented from being mixed into the air sucked from the intake port and sucked into the air cleaner again. Can be.

According to the fourth aspect of the present invention, the frame structure is provided with an equipment case located below the air cleaner and covering the equipment, and the dust guide plate is provided using the equipment case. Therefore, the space formed below the air cleaner can be effectively used.

Further, according to the invention of claim 5, the frame structure is provided with an undercover for closing the lower surface side thereof, and the space between the undercover and the frame structure is guided by the dust guide plate. Since a gap is provided to discharge dust to the lower side of the frame structure, dust released from the dust discharge port of the air cleaner can be discharged to the lower side of the frame structure, and this dust is discharged from the intake port. It is possible to reliably prevent the air from entering the air cleaner and returning to the inside of the air cleaner, thereby always supplying clean air to the engine.

According to the sixth aspect of the present invention, a dust guide tube for guiding the discharged dust to the outside of the vehicle body is provided at the dust discharge port of the air cleaner. Diffusion around the discharge port can be suppressed, and all discharged dust can be introduced into the dust guide tube and discharged to the outside of the vehicle body through the dust guide tube. Thus, clean air can be constantly supplied to the engine, and the frequency of maintenance work on the air cleaner can be reduced.

According to the seventh aspect of the present invention, the dust guide tube has a base end connected to the dust discharge port of the casing and a tip end connected to the outside of the vehicle body through the insertion hole of the under cover provided in the frame structure. Because it was configured to protrude,
Dust introduced into the dust guide tube can be reliably discharged to the outside of the vehicle body through the under cover. Thus, it is possible to reliably prevent the dust discharged to the outside of the vehicle body from returning to the air cleaner inside the vehicle body partitioned by the under cover.

Further, according to the eighth aspect of the present invention, since the dust guide tube is constituted by a flexible hose,
For example, even when various devices are provided around the air cleaner, the dust guide tube is flexed appropriately so that the dust guide tube is directed out of the vehicle body from the dust discharge port so as not to obstruct the devices. And can be easily arranged.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator to which a first embodiment of the present invention is applied.

FIG. 2 is an enlarged front view showing an engine, an air cleaner, and the like disposed on a revolving frame with a part of FIG. 1 cut away.

FIG. 3 shows an engine, an air cleaner and the like in FIG.
FIG. 3 is a transverse cross-sectional view as seen from the −III direction.

FIG. 4 is an enlarged perspective view showing main parts such as an air cleaner and a dust guide plate.

FIG. 5 is an enlarged cross-sectional view showing a main part of an air cleaner, a dust guide plate, and the like, as viewed from a direction indicated by arrows VV in FIG.

6 is an enlarged sectional view of a main part showing a state in which the vacuum suction valve in FIG. 5 is closed.

FIG. 7 is an enlarged sectional view of a main part showing a state where a vacuum suction valve in FIG. 5 is opened.

FIG. 8 is an enlarged perspective view of a principal part of a dust guide hose, an air cleaner, and the like according to a second embodiment at the same position as in FIG. 4;

9 is an enlarged sectional view of the air cleaner, the dust guide hose, and the like in FIG. 8 as viewed from the same position as in FIG.

[Explanation of symbols]

 5 Revolving frame (frame structure) 10 Engine 12 Intake pipe 13 Air cleaner 14 Casing 14C Intake port 14D Dust discharge port 16 Vacuum suction valve 18 Filter element 22 Relay case (equipment case) 24 Dust guide plate 24A Vertical surface 24B Inclined surface 25 Under Cover 27 Clearance 31 Dust guide hose (dust guide tube) 33 Under cover 33A Hose insertion hole (insertion hole)

Claims (8)

[Claims] 1. A frame structure that constitutes a vehicle body, an engine provided on the frame structure, and a cleaner provided to be connected to an intake side of the engine to separate dust contained in the air to provide a clean air. A construction machine comprising an air cleaner for supplying air to an engine, wherein the air cleaner has a casing having an intake port for sucking air and a dust discharge port for discharging dust in the sucked air to the outside, and provided in the casing. A filter element connected to an intake pipe of the engine, and a dust guide plate is provided on the frame structure side for guiding dust discharged from a dust discharge port of the casing toward the outside of the vehicle body. A construction machine having a configuration. 2. The construction machine according to claim 1, wherein the dust guide plate is provided with an inclined surface for guiding dust discharged from a dust discharge port of the air cleaner toward a lower side of the frame structure. . 3. The air cleaner according to claim 1, wherein an intake port and a dust discharge port of the air cleaner are provided downward, and the dust guide plate is arranged so as to partition between the intake port and the dust discharge port. Construction machinery. 4. The frame structure is provided with an equipment case located below the air cleaner and covering equipment, and the dust guide plate is provided using the equipment case. Or the construction machine according to 3. 5. An under cover for closing the lower surface of the frame structure, and dust guided by the dust guide plate is provided between the under cover and the frame structure. The construction machine according to claim 1, 2, 3, or 4, wherein a clearance is provided at a lower side for discharging. 6. A frame structure that constitutes a vehicle body, an engine provided on the frame structure, and a cleaner provided to be connected to an intake side of the engine to separate dust contained in air and to provide clean air. A construction machine comprising an air cleaner for supplying air to an engine, wherein the air cleaner has a casing having an intake port for sucking air and a dust discharge port for discharging dust in the sucked air to the outside, and provided in the casing. And a filter element connected to an intake pipe of the engine, and a dust discharge pipe for guiding dust discharged from the dust discharge port toward the outside of the vehicle body is provided at a dust discharge port of the casing. A construction machine having a configuration. 7. An under cover for closing the lower surface side of the frame structure, wherein the dust guide tube has a base end connected to a dust discharge port of the casing and a distal end provided in the under cover. The construction machine according to claim 6, wherein the construction machine is configured to protrude to the outside of the vehicle body through a hole. 8. The construction machine according to claim 6, wherein the dust guide tube is formed of a flexible hose.