JP2000291061A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working efficiency of a construction machine when a suction filter of a hydraulic oil tank is to be exchanged, to thereby alleviate the burden of an operator. SOLUTION: A hydraulic oil tank 9 is set on the right side of a revolving frame 4, and a suction pipe 12 for introducing hydraulic oil in a tank body 10 to a suction side of a hydraulic pump is attached onto a rear plate 10B of the tank body 10. Further, a suction filter 13 is attached onto an opening end 12A side of the suction pipe 12, and a filter exchanging window is perforated in a front plate 10A of the tank body 10, which window is covered by a cover body 15. A fixture 17 formed of a rod 18 and a supporting bracket 19 is arranged between the suction filter 13 and the cover body 15, and the suction filter 13 is fixed to the opening end 12A of the suction pipe 12 so as to be prevented from slipping out, by means of the fixture 17.

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 more particularly to a construction machine having a hydraulic oil tank for storing hydraulic oil supplied to and discharged from an actuator.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
An undercarriage, an upper revolving structure rotatably provided on the lower revolving structure, and an upper revolving structure constituting a vehicle body together with the lower revolving structure; It is composed of a device and the like.

[0003] The upper revolving superstructure has a revolving frame provided with a working device on the front side.
An engine that drives the hydraulic pump, a hydraulic oil tank that supplies hydraulic oil to the hydraulic pump and stores hydraulic oil returned from the actuator are mounted on the hydraulic pump.

Here, the hydraulic oil tank includes a box-shaped tank body, a suction pipe provided on the bottom side of the tank body, and communicating between the tank body and a suction side of the hydraulic pump. And a suction filter for purifying hydraulic oil flowing toward the suction pipe is attached to an open end of the suction pipe.

[0005]

By the way, the hydraulic oil tank of the hydraulic shovel according to the prior art described above has a structure in which a suction pipe is mounted on the bottom side of the tank body and a suction filter is mounted on the open end side of the suction pipe. Therefore, for example, when replacing the suction filter, the worker must extend his hand from the top side to the bottom side of the tank body and remove the suction filter from the bottom side of the tank body. There is a problem in that work is troublesome, and workability and the like cannot be improved.

In addition, it is necessary to separately provide a space for drawing the suction pipe between the frame and the bottom side of the tank body, and the height of the entire hydraulic oil tank is increased by the space. Become. When the hydraulic oil tank becomes high in this way, the outer cover that covers the hydraulic oil tank, the engine, and the like from above must also be made high, causing problems such as poor visibility from the driver's seat.

On the other hand, if the tank body itself is made small in the vertical direction in order to keep the height dimension of the entire hydraulic oil tank low, there is a problem that it is difficult to secure the capacity of the hydraulic oil tank.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and a filter of a hydraulic oil tank can be easily attached to and detached from a suction pipe, and workability at the time of filter replacement can be improved. It is another object of the present invention to provide a construction machine in which the total height of a hydraulic oil tank is reduced to ensure a sufficient capacity.

[0009]

In order to solve the above-mentioned problems, a construction machine according to the present invention comprises a frame constituting a movable vehicle body, a working device provided at a front side of the frame and operated by an actuator, and It comprises an engine mounted on a frame to drive a hydraulic pump, and a hydraulic oil tank that supplies hydraulic oil to the hydraulic pump and stores hydraulic oil returned from the actuator.

The first aspect of the present invention is characterized in that the hydraulic oil tank includes a tank body having a hexahedron shape and a suction pipe provided below one side surface of the tank body. A filter for cleaning the operating oil flowing out toward the suction pipe, a filter replacement window provided below the other side opposite to the one side, and a filter replacement window provided. A lid detachably provided on the other side surface for covering, and a filter provided between the lid and the filter through the filter exchange window so that the filter is positioned at an opening end of the suction pipe; It is constituted by a fixture which is fixed in a retaining state.

With this configuration, when removing the filter from the suction pipe at the time of replacement of the filter or the like, first, the lid is removed from the tank body together with the fixture to open the filter replacement window. Then, by taking out the fixture provided between the filter and the lid from the filter replacement window to the outside, the filter can be removed from the opening end side of the suction pipe, and the filter is replaced through the filter replacement window. be able to.

When the filter is mounted on the opening end side of the suction pipe, the filter is first inserted into the tank body through the filter replacement window and held by the suction pipe, and in this state, the lid is attached to the filter replacement window of the tank body. By attaching the filter, the filter can be fixed to the open end of the suction pipe in a retaining state by the fixing tool provided between the lid and the filter.

The filter replacement window is provided on the other side of the tank body made of a hexahedron opposite to the one side on which the suction pipe is provided. The user can easily insert a hand or a tool into the tank main body from the other side of the tank main body through the filter replacement window, so that the filter mounting and removing operations can be performed smoothly.

According to a second aspect of the present invention, in the fixing device, a rod-like member having a base end attached to the filter and a distal end extending toward the filter replacement window, and the rod-like member provided on the back side of the lid body. And a supporting member for supporting the member.

Thus, the rod-like member attached to the filter can be supported by the support member provided on the lid body side.
The mounting posture of the filter with respect to the suction pipe can be stabilized. When removing the filter from the suction pipe,
By removing the lid from the tank body, the support member can be removed from the rod-like member together with the lid, and in this state, the operator grasps the distal end side of the rod-like member through the filter replacement window to thereby remove the rod-like member. Together with the filter can be easily removed from the suction tube.

According to a third aspect of the present invention, a projection for positioning is provided on the tip end side of the rod-shaped member, and the projection comes into contact with the support member so that the filter is prevented from being pulled out from the open end of the suction pipe. Hold in state. Thus, the filter can be held in a state in which the filter is prevented from being removed from the opening end of the suction pipe by bringing the protrusion provided on the tip end side of the rod-shaped member into contact with the support member.

Further, according to a fourth aspect of the present invention, the frame is provided with an exterior cover for covering an upper portion of the engine, the hydraulic oil tank, and the like, and the frame includes the engine and the filter replacement window located below the exterior cover. A skirt cover is provided to cover the lower periphery of the hydraulic oil tank.

[0018] Thereby, when replacing the filter,
By removing the skirt cover arranged below the exterior cover, the lid covering the filter replacement window can be exposed from inside the vehicle body to the outside. By removing this lid, the filter replacement operation can be performed smoothly. be able to.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a construction machine according to an embodiment of the present invention, a small-swing hydraulic excavator will be described as an example in FIG.
This will be described in detail with reference to FIG.

In the drawings, reference numeral 1 denotes an undercarriage, and 2 denotes an upper revolving body which is mounted on the undercarriage 1 so as to be pivotable and which together with the undercarriage 1 forms a vehicle body of a hydraulic shovel. A work device 3 for performing an excavation work or the like is provided on the front side of 2 so as to be able to move up and down.

The upper swing body 2 is generally constituted by a swing frame 4, an engine 7, a hydraulic pump 8, a hydraulic oil tank 9, a driver's seat 24, a canopy 26, an outer cover 29, skirt covers 30, 31 and the like, which will be described later. ing.

Reference numeral 4 denotes a revolving frame which constitutes a frame of the upper revolving unit 2. As shown in FIG. 2, the revolving frame 4 has a flat bottom plate 4A having a substantially circular rear end side.
And left and right vertical plates 4B and 4B erected on the upper surface side of the bottom plate 4A and extending forward and backward, an upper plate 4C fixed to the front end upper surface of each vertical plate 4B, and a bottom plate 4A. A horizontal plate 4D and the like are provided standing upright and extend in the left-right direction across the vertical plates 4B.

The bottom plate 4A, the left and right vertical plates 4B, and the upper plate 4C have brackets 4 located at the front ends thereof.
E and 4E are provided, and the base end side of the working device 3 is attached to the bracket 4E. A turning device 5 is provided at the center of the bottom plate 4 </ b> A, and the upper turning structure 2 turns on the lower traveling structure 1 by operating the turning device 5.

Reference numeral 6 denotes a counterweight provided on the rear side of the revolving frame 4 to balance the weight with the working device 3. The counterweight 6 is formed in a substantially arc shape by a casting or the like when viewed from above. . Here, the counterweight 6 is configured such that its rear surface arc shape is within a predetermined turning radius (within the vehicle width of the lower traveling body 1), so that the driver's seat 24 is provided.
This prevents the counterweight 6 with poor visibility from interfering with the obstacle.

Reference numeral 7 denotes an engine located on the front side of the counterweight 6 and mounted on the rear side of the revolving frame 4. Reference numeral 8 denotes a hydraulic pump driven by the engine 7. The hydraulic pump 8 operates in the hydraulic oil tank 9. The oil is pressure-fed toward the undercarriage 1, the actuator of the working device 3, and the like.

Reference numeral 9 denotes a hydraulic oil tank provided on the revolving frame 4 at the right front side of the engine 7. The hydraulic oil tank 9 includes a tank body 10, a suction pipe 12, a suction filter 13, and a lid 15 described later. And a fixture 17 and the like, and are attached to the bottom plate 4A of the turning frame 4 via the bracket 11 and the like. And this hydraulic oil tank 9
Is for supplying hydraulic oil to the hydraulic pump 8 and for storing hydraulic oil returned from actuators provided in the lower traveling unit 1 and the working device 3 in the tank body 10.

Here, as shown in FIGS. 5 to 8, the tank body 10 includes a front plate 10A serving as a right side plate, a back plate 10B serving as a left side plate, a front side plate 10C, and a rear side plate 10C.
D, a bottom plate 10E and a top plate 10F. The front plate 10A and the back plate 10
B are arranged facing each other in the left-right direction.

A mounting flange 10A1 for a lid 15 is fixed to the front plate 10A of the tank body 10 at the outer peripheral side of a filter exchange window 14 described later. Further, as shown in FIG. 5, the rear side plate 10 </ b> D is formed as a concave portion in which a middle portion in the width direction is depressed in a V-shape toward the inside of the tank body 10.

Numeral 12 is a substantially L-shaped suction pipe provided between the hydraulic pump 8 and the tank body 10, and the suction pipe 12 has one end on the tank body as shown in FIGS. The opening end 12A is fixed to the lower end of the back plate 10B of the rear panel 10A. The other end of the suction pipe 12 is connected to the suction side of the hydraulic pump 8 via a rubber hose or the like, and is configured to guide hydraulic oil in the tank body 10 to the hydraulic pump 8 side.

Reference numeral 13 denotes a suction filter which is provided in the tank body 10 and is detachably provided at the open end 12A of the suction pipe 12. The suction filter 13 is formed in a horizontally long cylindrical shape, and has both ends. Annular mounting plates 13A and 13B are provided. Then, the mounting plate 13A of the suction filter 13
A rod 18 described later is provided integrally or detachably.

The mounting plate 13B of the suction filter 13
The suction filter 13 is positioned and fixed with respect to the opening end 12A by the fixture 17 in a state where its inner peripheral side is inserted into the outer periphery of the opening end 12A of the suction pipe 12 and abuts on an O-ring 21 described later. I have. And the suction filter 13
When the hydraulic oil in the tank body 10 flows out toward the suction pipe 12, foreign substances such as dust contained in the hydraulic oil are captured and the hydraulic oil is cleaned.

14 is a back plate 10B of the tank body 10.
The filter replacement window 14 is formed in the front plate 10A of the tank body 10 as a circular hole having a diameter larger than that of the suction filter 13. ing. The filter replacement window 14 allows the suction filter 13 to be taken in and out of the tank body 10 when the suction filter 13 is replaced.

Reference numeral 15 denotes a lid detachably provided on the front plate 10A of the tank main body 10 to cover the filter exchange window 14. The lid 15 has its outer peripheral side fastened to the mounting flange 10A1 of the tank main body 10. Is being worn. On the back side of the lid 15, a seal mounting cylinder 15A is fixedly mounted on the inner peripheral side of the mounting flange 10A1. On the outer peripheral side of the seal mounting cylinder 15A, the mounting flange 10A1 of the tank body 10 is fixed. An O-ring 16 is provided to seal the space between them in a gas-liquid tight manner. The lid 15 is detached from the tank body 10 at the time of replacing the suction filter 13 or the like, and opens the filter replacement window 14 to the outside.

Reference numeral 17 denotes a fixture provided between the suction filter 13 and the lid 15 through the filter exchange window 14. The fixture 17 is provided by a rod 18, a support bracket 19, and nuts 20, which will be described later. It is configured. The fixture 17 fixes the suction filter 13 to the open end 12A of the suction pipe 12 in a state where the suction filter 13 cannot be removed.

Reference numeral 18 denotes a rod as a rod-like member. The rod 18 has a base end integrally or detachably attached to a mounting plate 13A of the suction filter 13 as shown in FIGS. The inside of the tank body 10 extends in the left-right direction toward the filter replacement window 14.

Reference numeral 19 denotes a support bracket as a support member provided on the back side of the lid 15.
Is formed as shown in FIGS. 9 and 10 by bending an elongated plate made of a metal plate or the like in two steps.
5, an attachment plate portion 19A fixedly attached to the back surface side,
The tank body 1 is bent substantially L-shaped from the mounting plate portion 19A.
0, a horizontal plate portion 19B extending in the left-right direction to the suction filter 13 side, and a vertical plate portion 19C bent substantially in an L shape from the tip of the horizontal plate portion 19B and extending downward to the rod 18 side.
And is constituted by.

The vertical plate 19 of the support bracket 19
C has a through hole 19C1 formed at the lower end thereof, and the front end of the rod 18 is inserted into the through hole 19C1 so that the support bracket 19 supports the front end of the rod 18 on the lid 15 side. It is configured to be.

Further, the support bracket 19 is arranged such that the lower end of the vertical plate portion 19C is in contact with a nut 20 which will be described later.
By slightly elastically deforming the vertical plate portion 19C with respect to the horizontal plate portion 19B, the rod 18 can be pressed with an appropriate pressing force toward the suction filter 13, so that the mounting plate portion 13B of the suction filter 13 can be pressed. O-ring 21
, So that the suction filter 13 is positioned.

Reference numerals 20 and 20 denote two nuts as projections provided by screwing on the distal end side of the rod 18. Each of the nuts 20 constitutes a double nut and is loosened on the distal end side of the rod 18. It is screwed in a state. The nut 20 abuts the vertical plate 19C of the support bracket 19 to hold the suction filter 13 against the open end 12A of the suction pipe 12 in a retaining state. Further, each nut 20 is configured such that the pressing force from the support bracket 19 applied to the nut 20 can be variably adjusted by changing the screwing position with respect to the rod 18 as described above.

An O-ring 21 is located between the back plate 10B of the tank body 10 and the suction filter 13 and is provided on the outer peripheral side of the open end 12A of the suction pipe 12.
Is a liquid-tight seal between the open end 12A of the suction pipe 12 and the mounting plate 13B of the suction filter 13 by a pressing force applied from the support bracket 19 via the nut 20 and the lot 18.

Reference numeral 22 denotes a diversion control valve provided on the front side plate 10C of the tank main body 10. The diversion control valve 22 is a return pipe (not shown) for allowing return oil from the actuator to flow toward the inside of the tank main body 10. Connected to. The diversion control valve 22 is configured to open when the return oil is at a low temperature, and to return the return oil directly into the tank body 10.
Further, when the return oil from the actuator becomes high in temperature, the branching control valve 22 gradually opens so that the degree of opening becomes smaller in response to this, and at this time, a part of the return oil is removed from the oil cooler 23 shown in FIG. To the oil cooler 23
The return oil cooled to a low temperature by the above is returned into the tank body 10.

Reference numeral 24 denotes a driver's seat provided on a floor plate 25 that covers the revolving frame 4. Above the driver's seat 24 is a canopy 2.
6. Further, around the driver's seat 24, operation levers 27 and 28 for operating the lower traveling body 1, the working device 3, and the like are arranged.

Reference numeral 29 is located above the revolving frame 4,
An outer cover that covers the upper side of the engine 7 and the hydraulic oil tank 9;
Reference numeral 30 denotes a right skirt cover which is located below the outer cover 29 and covers the lower periphery of the filter replacement window 14 including the engine 7 and the hydraulic oil tank 9 from the right. The skirt cover 30 is a suction filter. As shown in FIG. 3, it is configured to be attached to and detached from the revolving frame 4 at the time of replacement work of the thirteen. Further, the revolving frame 4 is provided with a left skirt cover 31 (see FIG. 2) and the like that covers the lower periphery of the engine 7, the hydraulic pump 8, and the like from the left.

The hydraulic shovel according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic shovel will be described.

First, when the engine 7 is started and the hydraulic pump 8 is driven, the hydraulic oil is supplied from the hydraulic oil tank 9 to the suction pipe 1.
2 and is sucked into the hydraulic pump 8. Then, by operating the operation levers 27 and 28, the pressure oil from the hydraulic pump 8 is supplied / discharged to, for example, an actuator or the like of the working device 3, and the working device 3 is raised and lowered to perform earth excavation work or the like. At this time, the return oil from the actuator is
It is returned to the hydraulic oil tank 9 via the diversion control valve 22 and the like.

Next, the suction filter 1 is removed from the hydraulic oil tank 9.
3 will be described. First, before the operation, the hydraulic oil in the hydraulic oil tank 9 is drained in advance, and then the skirt cover 30 is removed from the turning frame 4 as shown in FIG. Remove. Then, as shown in FIG. 10, by removing the lid 15 from the tank body 10, the support bracket 19 is pulled out together with the lid 15 from the distal end side of the rod 18, and the filter replacement window 14 is opened to the outside.

Next, in this state, the operator extends the hand from the filter exchange window 14 into the tank main body 10, grasps the tip side of the rod 18, and pulls the rod 18 out of the filter exchange window 14. Thus, the suction filter 13 is removed together with the rod 18 from the opening end 12A of the suction pipe 12, and the suction filter 13 is removed from the filter replacement window 14 to replace the suction filter 13.

When the suction filter 13 is mounted on the suction pipe 12, the suction filter 13 is inserted into the tank body 10 from the filter replacement window 14 together with the rod 18 by grasping the distal end of the rod 18 by hand. Then, the suction filter 13 is inserted into the opening end 12A of the suction pipe 12 and temporarily fixed.

Next, the support bracket 1 provided on the lid 15
9 through the through hole 19C1.
8 on the tip side. Then, in this state, the lid 15 is fastened to the mounting flange 10A1 of the tank body 10, the filter replacement window 14 is covered with the lid 15, and finally the skirt cover 30 is attached to the revolving frame 4 to obtain the suction filter. 13 is completed.

In this case, the distal end side of the rod 18 is supported by the support bracket 19 and the rod 18
The nut 20 provided on the tip side of the
The vertical plate portion 19C contacts with an appropriate pressing force.
For this reason, the suction filter 13 is pressed against the O-ring 21 through the rod 18, and the suction filter 13 can be fixed to the open end 12 </ b> A of the suction pipe 12 in a retaining state.

Thus, in the present embodiment, the filter replacement window 14 is provided on the front plate 10A of the tank body 10 constituting the hydraulic oil tank 9, and the rear plate 10B of the tank body 10 facing the front plate 10A in the left-right direction. Side, the suction pipe 12 is provided at the lower side thereof, so that the suction filter 1
3 can be easily inserted into the tank body 10 through the filter exchange window 14 from the side of the upper revolving unit 2 and the suction filter 13
Mounting work and removal work can be performed smoothly.

Thus, as described in the prior art, for example, from the top plate 10F side of the tank body 10 to the bottom plate 10E
Reach in an unreasonable posture toward the side
There is no need to perform the replacement work, and the burden on the worker can be reduced, and the workability and the like can be improved. Also, when cleaning the inside of the tank body 10, the operator can easily reach into the tank body 10 through the filter replacement window 14 in substantially the same manner as in the above-described replacement work of the suction filter 13, and the cleaning is performed. Work can be performed easily.

Since the suction pipe 12 is attached to the back plate 10B of the hydraulic oil tank 9, the suction pipe as described in the prior art is provided between the revolving frame 4 and the bottom plate 10E of the tank body 10. There is no need to secure a special mounting space for the Twelve. Thereby, the hydraulic oil tank 9
With the height of the hydraulic oil tank 9 kept low, the entire hydraulic oil tank 9 can be formed large in the vertical direction.
Can be sufficiently secured, and the visibility from the driver's seat 24 can be kept good.

Further, the fixture 17 for the suction filter 13 used for the hydraulic oil tank 9 has a structure in which two nuts 20 are screwed to the distal end side of the rod 18 so that it is suitable for a hydraulic excavator or the like. Accordingly, even when the outer diameter of the hydraulic oil tank 9 is changed, the type of the suction filter 13 is changed, or a processing error or the like occurs in the support bracket 19, the screwing position of each nut 20 with respect to the rod 18 is changed. By changing, the pressing force applied from the support bracket 19 to the nut 20 can be variably adjusted.

Thus, even when the type of the hydraulic oil tank 9 or the suction filter 13 is changed according to the model or the like, the suction filter 13 can be kept pressed against the opening end 12A of the suction pipe 12 at all times. Suction filter 1
3 can be stably attached to the suction pipe 12.

In the embodiment, the rod-shaped member is described as being formed by using the rod 18 made of a cylindrical body. Alternatively, for example, the rod-shaped member may be formed by using an elongated plate-shaped member. You may.

Further, in the embodiment, the support member is described as being constituted by using the support bracket 19 formed of a plate-like body. However, instead of this, the support member formed of, for example, a frame-like body or a cylindrical body is used. May be configured.

Further, in the embodiment, the nut 20 is provided on the distal end side of the rod 18, and the nut 20 constitutes the protrusion for positioning the suction filter 13. An annular protrusion may be integrally formed on the outer periphery of the distal end side of 18, and the annular protrusion may constitute a positioning protrusion.

Further, in the embodiment, the canopy type excavator in which the driver's seat 24 is covered by the canopy 26 has been described as an example, but the present invention is not limited to this.
For example, as in a modification shown in FIG. 11, the driver's seat 24 may be applied to a cab-type hydraulic excavator provided in the cab 41.

Further, in the embodiments, the description has been made by taking the hydraulic excavator as an example of the construction machine, but the present invention is not limited to this, and can be applied to other construction machines such as a hydraulic crane and a bulldozer. .

[0061]

As described above in detail, according to the first aspect of the present invention, the hydraulic oil tank is provided with the suction pipe located below one side of the tank body composed of a hexahedron. On the lower side of the other side opposed to the side, a filter replacement window for replacing a filter provided at the opening end of the suction pipe is formed, and the filter replacement window is covered with a lid,
Since a fixing device is provided between the lid and the filter to fix the filter to the open end of the suction pipe in a retaining state, an operator can remove the tank body when replacing the filter. Hands or tools can be easily inserted into the tank body from the side through the filter replacement window, and the work of mounting and removing the filter can be performed smoothly.

This eliminates the need for the worker to extend his / her hand in an unreasonable posture from the top side to the bottom side of the tank body, for example, as described in the prior art, and reduces the burden on the worker. Thus, workability and the like at the time of filter replacement can be improved. In addition, it is not necessary to secure a special space for mounting the suction pipe between the frame and the bottom side of the tank body as described in the related art, so that the overall height of the hydraulic oil tank can be kept low, A sufficient capacity of the oil tank can be ensured, and a good view from the driver's seat can be maintained.

According to a second aspect of the present invention, there is provided a fixing device, comprising: a rod-shaped member extending from the filter toward the filter replacement window;
Since the support member is provided on the back surface side of the lid and supports the rod-shaped member, the support member can stabilize the mounting posture of the filter with respect to the suction pipe, and enhance the function as a fixture for fixing the filter to the suction pipe. be able to. Further, when removing the filter from the suction pipe, the tip side of the rod-shaped member is grasped through the filter replacement window, and the rod-shaped member is pulled out from the filter replacement window, whereby the filter can be easily removed together with the rod-shaped member from the suction pipe. In addition, workability at the time of filter replacement can be improved.

According to a third aspect of the present invention, a positioning projection is provided on the distal end side of the rod-shaped member, and the projection is brought into contact with the supporting member to prevent the filter from being pulled out of the opening end of the suction pipe. Since the filter is held in this state, the filter can be positioned with respect to the opening end of the suction pipe by the projection, and the filter can be reliably prevented from being removed.

Further, according to the invention of claim 4, the frame is provided with an outer cover for covering the upper side of the engine, the hydraulic oil tank and the like, and the engine, the engine, the hydraulic oil tank and the like are provided below the outer cover.
A skirt cover is provided to cover the lower periphery of the hydraulic oil tank including the filter replacement window.When replacing the filter, the cover covering the filter replacement window can be exposed outside the vehicle body by removing the skirt cover. In this state, by removing the lid and opening the filter replacement window, the filter replacement operation can be performed smoothly,
Work efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a plan view showing the excavator in FIG.

FIG. 3 is an enlarged front view showing the upper revolving superstructure in FIG. 1 in a state where a skirt cover is removed from a revolving frame.

FIG. 4 is a plan view showing a state in which an engine, a hydraulic oil tank, and the like are mounted on a turning frame.

FIG. 5 is an enlarged view of a main part showing, in an enlarged manner, a hydraulic oil tank and the like in FIG. 2;

FIG. 6 is a front view showing a hydraulic oil tank in FIG. 5;

7 is a right side view of the hydraulic oil tank as viewed from the direction of arrows VII-VII in FIG. 5;

FIG. 8 is a left side view of the hydraulic oil tank as seen from the direction of arrows VIII-VIII in FIG.

FIG. 9 is an enlarged sectional view of a main part of the filter, the filter replacement window, the lid, the fixture, and the like, as viewed from the direction indicated by arrows IX-IX in FIG.

FIG. 10 is an enlarged sectional view similar to FIG. 9, showing a state where a filter and a lid are removed.

FIG. 11 is a front view showing a hydraulic excavator according to a modification of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving unit 4 Revolving frame 7 Engine 8 Hydraulic pump 9 Hydraulic oil tank 10 Tank body 10A Front plate (other side surface) 10B Back plate (one side surface) 12 Suction pipe 12A Open end 13 Suction filter 14 Filter Exchange window 15 Lid 17 Fixture 18 Rod (rod-like member) 19 Support bracket (support member) 20 Nut (projection) 29 Exterior cover 30, 31 Skirt cover

 ──────────────────────────────────────────────────の Continued on the front page (72) Koji Nishimura, Inventor 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. (72) Inventor Kazunori Yamada 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi, Ltd. (72) Inventor Hiroshi Iwashita 1828 Shinji, Chiyoda-cho, Niigata-gun, Ibaraki F-term (reference) 2D015 BA04 CA00 3D037 CA00 CB06 CB15 CB23 CB29 CB30 3H086 AA26 AE02 AE11 AE32

Claims (4)

[Claims] 1. A frame constituting a movable vehicle body,
A working device provided on the front side of the frame and operated by an actuator, an engine mounted on the frame and driving a hydraulic pump, and a hydraulic oil for supplying hydraulic oil to the hydraulic pump and storing hydraulic oil returning from the actuator In a construction machine comprising a tank, the hydraulic oil tank includes a tank body having a hexahedron, a suction pipe provided below one side surface of the tank body, A filter for purifying the operating oil flowing out, a filter replacement window provided under the other side opposite to the one side, and the other for covering the filter replacement window. A lid detachably provided on a side surface, and the filter provided at a position between the lid and the filter through the filter exchange window, the filter being attached to an open end of the suction pipe. A construction machine characterized by comprising a fixing member for fixing in a retaining state. 2. The fixing device according to claim 1, wherein the fixing member includes a rod-like member having a base end attached to the filter and a distal end extending toward the filter replacement window, and a support member provided on the back side of the lid to support the rod-like member. The construction machine according to claim 1, wherein the construction machine comprises: 3. A positioning projection is provided on a tip side of the rod-shaped member, and the projection abuts on the support member to hold the filter in a state of being prevented from being pulled out from an opening end of the suction pipe. The construction machine according to claim 2, wherein 4. An outer cover for covering an upper side of the engine, the hydraulic oil tank or the like is provided on the frame, and a lower portion of the hydraulic oil tank including the engine and a filter replacement window is positioned below the outer cover. The construction machine according to claim 1, further comprising a skirt cover covering a side periphery.