JP3461138B2 - Construction machinery - Google Patents

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 excavator, and more particularly to a construction machine equipped with 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 body that is rotatably provided on the lower revolving body and constitutes a vehicle body together with the lower traveling body, and work that is provided on the front side of the upper revolving body so that it can be lifted and lowered, and is operated by an actuator. It is composed of a device and the like.

Further, the upper revolving structure has a revolving frame provided with a working device on the front side, and the revolving frame has
An engine for driving the hydraulic pump, a hydraulic oil tank for supplying hydraulic oil to the hydraulic pump and storing hydraulic oil returning from the actuator, and the like are mounted.

Here, the hydraulic oil tank includes a box-shaped tank main body, a suction pipe, etc., which is provided at the bottom side of the tank main body and which connects the tank main body with the suction side of the hydraulic pump. A suction filter for cleaning the working oil flowing toward the suction pipe is attached to the open end of the suction pipe.

[0005]

In the hydraulic oil tank of the hydraulic excavator according to the above-mentioned prior art, the suction pipe is attached to the bottom surface side of the tank body, and the suction filter is attached to the open end side of the suction pipe. For this reason, when replacing the suction filter, for example, the operator must reach out 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 that work is troublesome and workability cannot be improved.

Further, it is necessary to separately secure a space for routing the suction pipe between the frame and the bottom surface side of the tank body, and the height of the entire hydraulic oil tank is increased by this space. Become. When the hydraulic oil tank becomes high in this way, the exterior cover that covers the hydraulic oil tank, the engine, and the like from above must also be made high, which causes 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 of the entire hydraulic oil tank low, there is a problem that it becomes difficult to secure the capacity of the hydraulic oil tank.

The present invention has been made in view of the above-mentioned problems of the prior art. The filter of the hydraulic oil tank can be easily attached to and removed from the suction pipe, and the workability at the time of filter replacement can be improved. , The purpose of the present invention is to provide a construction machine in which the total height of the hydraulic oil tank is lowered 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 vehicle body capable of traveling, a working device provided on the front side of the frame and operated by an actuator, It comprises an engine mounted on a frame for driving a hydraulic pump, and a hydraulic oil tank for supplying hydraulic oil to the hydraulic pump and storing hydraulic oil returned from the actuator.

The feature of the configuration adopted by the invention of claim 1 is that the plurality of side plates, the bottom plate and the top plate form a box shape.
And a plurality of side surfaces of the tank body
A suction pipe provided in a position below the one side plate in the plate, the open end of the intake write pipe positioned in said tank body
A filter for cleaning the hydraulic fluid flowing out toward the intake write pipe from detachably provided the tank body, the tank
The other aspects for lidding the filter replacement window was found provided positioned below the other side plate opposite to the one side plate, the filter replacement window among the plurality of side plates of the click body a lid provided detachably on a plate <br/>, retaining state the filter is provided through said filter replacement window between the filter and the lid to the opening end of the suction tube It is configured with a fixing tool that is fixed by.

With this configuration, when the filter is removed from the suction pipe when the filter is replaced, the lid body is first removed from the tank body together with the fixing tool to open the filter exchange window. Then, by subsequently removing the fixture provided between the filter and the lid from the filter exchange window to the outside, the filter can be removed from the opening end side of the suction pipe, and the filter can be exchanged through the filter exchange window. be able to.

Further, when the filter is attached to the opening end side of the suction pipe, first, the filter is inserted into the tank main body through the filter exchange window and held by the suction pipe. In this state, the lid is attached to the filter exchange window of the tank main body. By mounting, the filter can be fixed to the open end of the suction pipe in a retaining state by a fixture provided between the lid and the filter.

Here, a plurality of side plates, a bottom plate and an upper surface
Of the side plates of the tank body formed in a box shape by the plates
Filter the suction pipe on one of the side plates
Replacement windows, because it provided the other side plate opposite from said one side plate, at the time of replacement of the filter described above, the operator manually or through other filters replacement window from the side plate side of the tank body Tools and the like can be easily inserted into the tank body, and the filter mounting and removing operations can be performed smoothly.

According to a second aspect of the present invention, in the fixture, a rod-shaped member having a base end side attached to the filter and a tip end side extending toward the filter exchange window, and the rod-shaped member provided on the back surface side of the lid body are provided. And a supporting member that supports the member.

As a result, the rod-shaped member attached to the filter can be supported by the supporting member provided on the lid side.
The mounting posture of the filter with respect to the suction pipe can be stabilized. Also, when removing the filter from the suction pipe,
By removing the lid from the tank body, the support member can be removed together with the lid from the rod-shaped member, and in this state, the operator grasps the tip end side of the rod-shaped member through the filter exchange window to remove the rod-shaped member. With it the filter can be easily removed from the suction tube.

According to the third aspect of the present invention, a positioning projection is provided on the tip end side of the rod-shaped member, and the projection is brought into contact with the support member to prevent the filter from being pulled out from the open end of the suction pipe. Holds in a state. Accordingly, by bringing the protrusion provided on the tip end side of the rod-shaped member into contact with the support member, it is possible to hold the filter in a state in which it is not pulled out from the open end of the suction pipe.

Further, according to the invention of claim 4, the frame is provided with an exterior cover for covering an upper side of the engine, the hydraulic oil tank and the like, and the engine and the filter exchange window are located below the exterior cover. A skirt cover is provided to cover the lower circumference of the hydraulic oil tank.

As a result, when the filter is replaced,
By removing the skirt cover located below the exterior cover, the lid that covers the filter exchange window can be exposed from the inside of the vehicle body to the outside, and the filter can be smoothly replaced by removing the lid. be able to.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A small swing hydraulic excavator will be described below as an example of a construction machine according to an embodiment of the present invention.
A detailed description will be given with reference to FIGS.

In the drawings, 1 is an undercarriage, and 2 is an upper revolving structure which is rotatably mounted on the undercarriage 1 and constitutes a vehicle body of a hydraulic excavator together with the undercarriage 1. A working device 3 for performing excavation work and the like is provided on the front side of 2 so as to be able to move up and down.

The upper revolving structure 2 is generally constituted by a revolving 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 and 31 which will be described later. ing.

Reference numeral 4 denotes a swivel frame which constitutes the frame of the upper swivel body 2. As shown in FIG. 2, the swivel frame 4 has a flat bottom plate 4A whose rear end side is formed in a substantially circular shape.
From the bottom plate 4A, the left and right vertical plates 4B, 4B standing upright on the upper surface of the bottom plate 4A and extending in the front and rear directions, the upper plate 4C fixed to the upper surface of the front end of each vertical plate 4B, It is constituted by a horizontal plate 4D and the like which are erected upright and extend in the left-right direction across each vertical plate 4B.

The bottom plate 4A, the left and right vertical plates 4B, and the upper plate 4C are located on the front end sides of the brackets 4A and 4B, respectively.
E and 4E are provided, and the base end side of the working device 3 is attached to the bracket 4E. Then, a revolving device 5 is provided in the center of the bottom plate 4A, and by operating the revolving device 5, the upper revolving structure 2 revolves on the lower traveling structure 1.

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

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

Reference numeral 9 is a hydraulic oil tank provided on the revolving frame 4 on the front right 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 which will be described later. And a fixture 17 and the like, and is attached to the bottom plate 4A of the revolving frame 4 via the bracket 11 and the like. And this hydraulic oil tank 9
Is to supply the hydraulic oil to the hydraulic pump 8 and store the hydraulic oil returned from the actuators provided in the lower traveling body 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 rear plate 10B serving as a left side plate, a front side plate 10C, and a rear side plate 10.
D, a bottom plate 10E, and a top plate 10F, which are formed in a box shape of a hexahedron, and have the front plate 10A and the back plate 10
B is arranged to face each other in the left-right direction.

A mounting flange 10A1 for the lid 15 is fixed to the front plate 10A of the tank body 10 at the outer peripheral side of the filter exchange window 14 described later. Further, as shown in FIG. 5, the rear side surface plate 10D is formed as a concave recessed portion in which the intermediate portion in the width direction is recessed inward toward the inside of the tank body 10.

Reference numeral 12 denotes a suction pipe having a substantially L-shape provided connected between the hydraulic pump 8 and the tank main body 10. The suction pipe 12 has one end side having a tank main body as shown in FIGS. The rear end plate 10B of 10 has an open end 12A fixed to the lower end side. 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 to guide the hydraulic oil in the tank body 10 to the hydraulic pump 8 side.

Reference numeral 13 denotes a suction filter which is located inside 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 both end sides thereof are provided. Annular mounting plates 13A and 13B are provided. And the mounting plate 13A of the suction filter 13
A rod 18, which will be described later, is provided integrally therewith or detachably.

Further, the mounting plate 13B of the suction filter 13
Has its inner peripheral side inserted into the outer periphery of the opening end 12A of the suction pipe 12 and is in contact with an O-ring 21 described later, the suction filter 13 is positioned and fixed with respect to the opening end 12A by a fixture 17. There is. And the suction filter 13
When the operating oil in the tank body 10 flows out toward the suction pipe 12, foreign matter such as dust contained in the operating oil is captured and the operating oil is cleaned.

Reference numeral 14 denotes a back plate 10B of the tank body 10.
Is a filter exchange window formed at the lower end of the front plate 10A facing the front plate 10A. The filter exchange 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 exchange window 14 is for taking the suction filter 13 in and out of the tank body 10 when exchanging the suction filter 13.

Reference numeral 15 denotes a lid body which is detachably provided on the front plate 10A of the tank body 10 to cover the filter exchange window 14. The lid body 15 is fastened to the mounting flange 10A1 of the tank body 10 on the outer peripheral side. It is worn. A seal mounting cylinder 15A is fixed to the back side of the lid 15 at the inner peripheral side of the mounting flange 10A1. The seal mounting cylinder 15A has a mounting flange 10A1 on the outer peripheral side thereof. An O-ring 16 is attached to seal the space between them in a gas-liquid tight manner. The lid 15 is detached from the tank body 10 when the suction filter 13 is replaced, and the filter replacement window 14 is opened 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 includes a rod 18, a support bracket 19 and nuts 20 to 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 retaining state.

Reference numeral 18 denotes a rod as a rod-shaped member. The rod 18 has a base end side integrally or removably attached to the attachment plate 13A of the suction filter 13 as shown in FIGS. The tank main body 10 extends in the left-right direction toward the filter exchange window 14.

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

The vertical plate portion 19 of the support bracket 19
A through hole 19C1 is formed in the lower end side of C, and the tip end side of the rod 18 is inserted into the through hole 19C1 so that the support bracket 19 supports the tip end side of the rod 18 to the lid 15 side. It is configured to let.

Further, the support bracket 19 is such that the lower end side of the vertical plate portion 19C is in contact with a nut 20 described later,
By slightly elastically deforming the vertical plate portion 19C with respect to the horizontal plate portion 19B, it is possible to press the rod 18 toward the suction filter 13 side with an appropriate pressing force, whereby the mounting plate portion 13B of the suction filter 13 is O-ring 21
Is always brought into contact with the suction filter 13 to position the suction filter 13.

Reference numerals 20 and 20 denote two nuts as protrusions provided by screwing on the tip side of the rod 18. Each of the nuts 20 constitutes a double nut and is loosely secured to the tip side of the rod 18. It is screwed in the state. The nut 20 abuts on the vertical plate portion 19C of the support bracket 19 to hold the suction filter 13 in a state where the suction filter 13 is not pulled out from the open end 12A of the suction pipe 12. Further, each nut 20 is configured so that the pressing force applied from the support bracket 19 to the nut 20 can be variably adjusted by changing the screwing position with respect to the rod 18.

Reference numeral 21 denotes an O-ring which 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 opening end 12A of the suction pipe 12.
Is to liquid-tightly seal between the opening end 12A of the suction pipe 12 and the mounting plate 13B of the suction filter 13 by the pressing force applied from the support bracket 19 via the nut 20 and the lot 18.

A diversion control valve 22 is provided on the front side plate 10C of the tank body 10. The diversion control valve 22 is a return pipe (not shown) for circulating the return oil from the actuator toward the inside of the tank body 10. Connected to. The diversion control valve 22 is configured to open when the return oil is at a low temperature and directly return the return oil into the tank body 10.
Further, when the return oil from the actuator becomes high in temperature, the diversion control valve 22 gradually opens so that the opening degree becomes smaller. At this time, part of the return oil is partially cooled by the oil cooler 23 shown in FIG. Oil cooler 23
The return oil cooled to a low temperature is recirculated into the tank body 10.

Reference numeral 24 is a driver's seat provided on a floor plate 25 covering the turning frame 4, and the upper part of the driver's seat 24 is the canopy 2.
Covered by 6. Further, around the driver's seat 24, the lower traveling body 1, operation levers 27, 28 for operating the work device 3, and the like are arranged.

29 is located above the revolving frame 4,
An exterior 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 exterior cover 29 and covers the lower periphery of the filter exchange window 14 including the engine 7 and the hydraulic oil tank 9 from the right side. 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 when exchanging work 13 or the like. Further, the revolving frame 4 is provided with a left skirt cover 31 (see FIG. 1 ) that covers the lower periphery of the engine 7, the hydraulic pump 8 and the like from the left side.

The hydraulic excavator according to the present embodiment has the above-mentioned structure, and its operation will be described below.

First, when the engine 7 is started and the hydraulic pump 8 is driven, the working oil is drawn from the working oil tank 9 into the suction pipe 1.
2 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 to and discharged from, for example, the actuator of the working device 3 and the working device 3 is raised and lowered to perform excavation work of earth and sand. Also, at this time, the return oil from the actuator is
It is returned to the hydraulic oil tank 9 via the flow dividing control valve 22 and the like.

Next, the suction filter 1 from the hydraulic oil tank 9
In order to explain the work procedure when replacing 3, the working oil in the working oil tank 9 is first drained before carrying out the work, and then the skirt cover 30 is removed from the revolving frame 4 as shown in FIG. Remove. Then, as shown in FIG. 10, by removing the lid body 15 from the tank body 10, the support bracket 19 together with the lid body 15 is pulled out from the tip side of the rod 18, and the filter exchange window 14 is opened to the outside.

Next, in this state, the operator extends his hand through the filter exchange window 14 into the tank body 10 to grasp the tip end side of the rod 18, and pulls the rod 18 out through the filter exchange window 14. As a result, the suction filter 13 together with the rod 18 is removed from the open end 12A of the suction pipe 12, and the suction filter 13 is removed from the filter exchange window 14 to replace the suction filter 13.

When the suction filter 13 is attached to the suction pipe 12, by grasping the tip side of the rod 18 by hand, the suction filter 13 is inserted into the tank body 10 together with the rod 18 through the filter exchange window 14. 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 body 15
The vertical plate portion 19C of the rod 9 through the through hole 19C1
8 is inserted into the tip side. Then, in this state, the lid body 15 is fastened to the mounting flange 10A1 of the tank body 10, the filter exchange window 14 is covered with the lid body 15, and finally the skirt cover 30 is attached to the swivel frame 4. Complete the replacement work of 13.

In this case, the tip side of the rod 18 is supported by the support bracket 19, and the rod 18 is also supported.
The nut 20 provided on the tip side of the
The vertical plate portion 19C side of the above abuts with an appropriate pressing force.
Therefore, 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 12A of the suction pipe 12 in a detached 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 back plate 10B of the tank body 10 facing the front plate 10A in the left-right direction. Since the suction pipe 12 is provided on the lower side of the suction filter 1, the suction filter 1
During the replacement work of 3, the operator can easily insert a hand, a tool or the like into the tank main body 10 from the side of the upper swing body 2 through the filter replacement window 14, and the suction filter 13
Installation and removal work can be done smoothly.

As a result, as described in the prior art, for example, from the top plate 10F side of the tank body 10 to the bottom plate 10E.
Suction filter 13
It is no longer necessary to perform the replacement work, and it is possible to reduce the burden on the worker and improve workability and the like. Also, when cleaning the inside of the tank body 10, the worker can easily reach into the tank body 10 through the filter replacement window 14 in the same manner as in the replacement work of the suction filter 13 described above. 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 swivel frame 4 and the bottom plate 10E of the tank body 10. There is no need to specially secure a mounting space for 12. As a result, the hydraulic oil tank 9
This hydraulic oil tank 9 can be made large in the vertical direction with the height of the hydraulic oil tank 9 kept low.
Capacity can be sufficiently secured, and the visibility from the driver's seat 24 can be kept good.

Further, since the fixing tool 17 for the suction filter 13 used in the hydraulic oil tank 9 is constructed such that two nuts 20 are screwed on the tip end side of the rod 18, it is suitable for hydraulic excavator models and the like. Accordingly, even if the outer diameter of the hydraulic oil tank 9 is changed, the type of the suction filter 13 is changed, or a processing error occurs in the support bracket 19, the screwing position of each nut 20 with respect to the rod 18 is changed. By changing it, the pressing force applied to the nut 20 from the support bracket 19 can be variably adjusted.

As a result, even when the type of the hydraulic oil tank 9 or the suction filter 13 is changed according to the model, etc., the suction filter 13 can be held while being constantly pressed against the open end 12A of the suction pipe 12, Suction filter 1
3 can be stably attached to the suction pipe 12.

In the embodiment, the rod-shaped member is described as being constructed by using the rod 18 made of a cylindrical body, but instead of this, for example, an elongated plate-shaped body is used to construct the rod-shaped member. May be.

Further, in the embodiment, the supporting member is described as being constituted by using the supporting bracket 19 made of a plate-shaped member, but instead of this, the supporting member made of, for example, a frame-shaped member or a cylindrical member. May be configured.

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

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

Furthermore, in the embodiment, the hydraulic excavator was described 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 in detail above, according to the invention of claim 1, the tank body of the hydraulic oil tank is provided with a plurality of side plates and a bottom.
Formed in a box shape with a face plate and a top plate,
The suction pipe is provided on the lower side of one side plate in the plate, on the lower side of the other side plate opposite to the one side plate, filter to replace the filter provided at the opening end of the suction tube An exchange window is bored, the filter exchange window is covered by a lid, and a fixture is provided between the lid and the filter for fixing the filter to the open end of the suction pipe in a retaining state. since a configuration, replacement or the like in the filter, the operator remove the lid from the other side plate side of the tank body
After that, a hand, a tool or the like can be easily inserted into the tank main body through the filter exchange window, and the filter mounting and removing operations can be performed smoothly.

[0062] Thus, the operator, as described in the prior art, for example toward the upper face plate side of the tank body on the bottom plate side extend hand unnatural posture, that eliminates the need to perform replacement work of the filter Therefore , the burden on the operator can be reduced.
In addition , workability when replacing the filter can be improved.
In addition, it is not necessary to specially secure the installation space for the suction pipe as described in the prior art between the frame and the bottom surface side of the tank main body, so that the total height of the hydraulic oil tank can be kept low and capacity of the oil tank can be sufficiently ensured, it is possible to maintain good visibility from the driver's seat.

Further, the invention according to claim 2 is characterized in that the fixture is a rod-shaped member extending from the filter toward the filter exchange 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. Also, when removing the filter from the suction pipe, by grasping the tip side of the rod-shaped member through the filter exchange window and pulling out the rod-shaped member from the filter exchange window, the filter together with this rod-shaped member can be easily removed from the suction pipe. The workability at the time of filter replacement can be improved.

According to the third aspect of the present invention, a protrusion for positioning is provided on the tip side of the rod-shaped member, and the protrusion is brought into contact with the support member to prevent the filter from being pulled out from the open end of the suction pipe. Since the filter is held in this state, the filter can be positioned with respect to the open end of the suction pipe by the protrusion, and the filter can be securely prevented from coming off.

Further, in the invention of claim 4, the frame is provided with an exterior cover for covering the upper side of the engine, the hydraulic oil tank and the like, and the engine cover is provided under the exterior cover.
Since a skirt cover that covers the lower side of the hydraulic oil tank including the filter replacement window is provided, the lid that covers the filter replacement window can be exposed to the outside of the vehicle body by removing the skirt cover when replacing the filter. In this state, the lid can be removed and the filter replacement window can be opened to facilitate the filter replacement work.
Work efficiency can be improved.

[Brief description of 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 hydraulic excavator in FIG.

FIG. 3 is an enlarged front view showing an enlarged upper revolving structure in FIG. 1 with a skirt cover removed from a revolving frame.

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

5 is an enlarged view of an essential part showing the hydraulic oil tank and the like in FIG. 4 in an enlarged manner.

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

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

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

9 is an enlarged cross-sectional view of essential parts showing a filter, a filter exchange window, a lid, a fixture and the like as seen from the direction of the arrow IX-IX in FIG.

FIG. 10 is an enlarged cross-sectional view similar to FIG. 9, showing the filter and the lid removed.

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

[Explanation of symbols]

1 Lower Traveling Body 2 Upper Revolving Body 4 Revolving Frame 7 Engine 8 Hydraulic Pump 9 Hydraulic Oil Tank 10 Tank Main Body 10A Front Plate (Other Side Plate ) 10B Rear Plate (One Side Plate ) 10C Front Side Plate 10D Rear Side Plate 10E Bottom Face plate 10F Top plate 12 Suction tube 12A Open end 13 Suction filter 14 Filter exchange window 15 Lid 17 Fixing tool 18 Rod (rod-like member) 19 Support bracket (Support member) 20 Nut (protrusion) 29 Exterior cover 30, 31 Skirt cover

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Iwashita 1828 Shinji, Chiyoda-cho, Ibaraki Prefecture Kai 63-86033 (JP, U) Actual Kai 62-20201 (JP, U) Actual Kai Hei 6-85902 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02F 9 / 00 B60K 25/02 F15B 1/26

Claims (4)

(57) [Claims] 1. A frame constituting a drivable vehicle body,
A working device provided on the front side of the frame and operated by an actuator, an engine mounted on the frame for 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 the construction machine including a tank, the hydraulic oil tank includes a plurality of side plates, a bottom plate and an upper surface.
A tank body formed in a box shape of a plate, a suction tube provided positioned below the one side plate of the plurality of side plates of the tank body, intake write situated in said tank main body
A filter detachably provided at the open end of the pipe for cleaning hydraulic oil flowing from the inside of the tank body toward the suction pipe; and one of the plurality of side plates of the tank body. and provided et the filter replacement window located below the other side plate opposite the <br/> faceplate, provided detachably on the other side plate for lidding the filter replacement window wherein a lid, that constituted by the fixture for fixing in retaining state the filter is provided through said filter replacement window between the filter and the lid to the opening end of the suction tube And construction machinery. 2. The fixing member includes a rod-shaped member having a base end side attached to the filter and a tip end side extending toward the filter exchange window, and a support member provided on the back surface side of the lid to support the rod-shaped member. construction machine according to claim 1 ing constitute Ri by the door. 3. A positioning projection is provided on the tip side of the rod-shaped member, and the projection is brought into contact with the support member to hold the filter in a state in which the filter is not pulled out from the open end of the suction pipe. The construction machine according to claim 2, which is configured to: 4. An outer cover that covers the upper side of the engine, the hydraulic oil tank, and the like on the frame, and a lower peripheral portion of the hydraulic oil tank that is located below the external cover and includes the engine and a filter exchange window. Ru provided a skirt cover which covers the
The construction machine according to claim 1 , which is configured .