JP2009030346A - Oil storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil storage tank capable of being efficiently arranged in a space above a revolving frame while ensuring a sufficient space for connecting a pipe. <P>SOLUTION: This hydraulic fluid tank 30 is provided with three sets of two faces being mutually and substantially parallel (vertical faces 51b, 51d, vertical faces 51c, 52b, and a ceiling face 52a and a bottom face 52c) and an inclined face 51a. The inclined face 51a is provided with a pipe connection part 31 being a connection part with a return pipe 41 for returning hydraulic fluid into the tank from the outside and is inclined for at least one of the vertical faces 51b-51d, 52b, the ceiling face 52a, and the bottom face 52c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oil storage tank placed on a turning frame such as a hydraulic excavator, for example.

In general, an engine, a cooling unit including a radiator and a fan for cooling the engine, a hydraulic oil tank, a fuel tank, and the like are mounted on a turning frame of a construction machine such as a hydraulic excavator.
In such a construction machine such as a hydraulic excavator, the work is performed while turning the turning frame. Therefore, it is preferable that the space on the turning frame is saved as much as possible.

For example, Patent Document 1 discloses a configuration around an engine room of a hydraulic excavator on which an engine, an air cleaner, a radiator, an oil cooler, a hydraulic oil tank, a fuel tank, and the like are placed.
JP 2001-073407 A (published March 21, 2001)

However, the conventional hydraulic excavator has the following problems.
That is, in order to save the space on the swing frame of the hydraulic excavator described above, it is necessary to arrange each component efficiently. For this reason, in oil storage tanks, etc., to which oil piping is connected, even when placed close to the wall surface in the space on the swivel frame, it is necessary to secure the space to connect the piping by devising the shape of the wall surface etc. It may not be possible.

  The subject of this invention is providing the oil storage tank which can be efficiently arrange | positioned in the space on a turning frame, fully ensuring the space for piping connection.

  An oil storage tank according to a first aspect of the present invention is configured by combining three sets of two surfaces that are substantially parallel to each other, and is an oil storage tank that stores oil in an internal space, and includes three sets of two surfaces. And an inclined surface. The inclined surface is connected obliquely to any one of the surfaces, and has a connection opening through which a pipe for supplying oil returning from the outside or sending out to the outside passes.

Here, for example, in an oil storage tank that is mounted on a turning frame of a construction machine such as a hydraulic excavator, a new surface that is obliquely connected to any one of six surfaces constituting a substantially hexahedral tank ( Sloped surface). An opening for pipe connection is formed on the inclined surface.
Thereby, for example, since the pipe connected to the oil storage tank is connected to the newly provided inclined surface, in order to secure the connection space of the pipe, the wall surface of the component adjacent to the oil storage tank, etc. There is no need to provide a space between them. As a result, in the arrangement space in which the oil storage tank is placed, the size of the oil storage tank can be increased, or the arrangement area of each part in the arrangement space can be reduced to efficiently arrange each part. Further, the shape of the partition plate disposed adjacent to the oil storage tank can be smoothed for simplification.

An oil storage tank according to a second aspect of the invention is the oil storage tank according to the first aspect of the invention, wherein the inclined surface is a side surface that intersects the bottom surface and the ceiling surface substantially perpendicularly among the two surfaces of the three sets. Is arranged.
Here, the inclined surface provided with the pipe connection port is provided on the side surface side.
In this way, by connecting the piping to the piping connection port formed on the inclined surface provided on the side surface side, in particular, the space around the side surface of the oil storage tank is effectively utilized, and each part is efficiently Can be arranged.

An oil storage tank according to a third invention is the oil storage tank according to the first or second invention, and is configured by combining a substantially U-shaped first member and a second member.
Here, the substantially seven-sided oil storage tank including the inclined surface described above is configured by combining two substantially U-shaped components (first member and second member).
Here, the substantially U-shaped component refers to a component that is formed by three surfaces that are continuous in one direction so as to cross each other substantially perpendicularly and has a substantially U shape in a side view.
Accordingly, for example, the inclined surface described above is provided on one side of two substantially U-shaped parts, and the first member and the second member are combined and joined to each other by welding or the like. An oil storage tank having a desired shape can be formed.

An oil storage tank according to a fourth aspect of the present invention is the oil storage tank according to any one of the first to third aspects of the present invention, further comprising a strainer that is housed in the internal space for filtering the oil. The strainer is disposed at a substantially central portion on the bottom surface constituting the internal space.
Here, the strainer accommodated in the oil storage tank for filtering the oil is arranged at substantially the center of the bottom surface of the oil storage tank.

Here, if a strainer is placed at the corner of the bottom surface of the oil storage tank, the oil level around the strainer becomes low depending on the direction in which the oil storage tank is tilted, and the oil supply to the strainer is sufficient. There is a risk of being lost.
For this reason, by arranging the strainer near the center of the bottom surface of the oil storage tank, the oil can be stably supplied to the strainer regardless of which direction the oil storage tank is tilted.

  An oil storage tank according to a fifth aspect of the present invention is the oil storage tank according to any one of the first to fourth aspects, wherein the oil storage tank is disposed above the strainer and is supplied from outside through a pipe. It further includes a filter that removes foreign substances and drops them downward. The filter is disposed at a position that does not overlap the strainer in plan view.

Here, the filter and the strainer are arranged so as not to overlap each other in plan view.
As a result, even when the oil dripped from the filter disposed above the strainer contains a large amount of air bubbles, the oil once accumulates in the oil reservoir and then flows into the strainer to directly enter the strainer. It is possible to avoid flowing in. As a result, it is possible to prevent the oil containing bubbles from flowing into the pump through the strainer and causing problems such as aeration.

  According to the oil storage tank of the present invention, the size of the oil storage tank can be increased or the arrangement area of each component can be reduced efficiently in the space in which the oil storage tank is placed.

A hydraulic excavator (construction machine) 1 equipped with a hydraulic oil tank (oil storage tank) 30 according to an embodiment of the present invention will be described below with reference to FIGS.
[Configuration of hydraulic excavator 1 as a whole]
As shown in FIG. 1, the hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, a turning frame 3, a work implement 4, a counterweight 5, an engine 6, an equipment room 9, and a cab 10. It is equipped with.

The lower traveling body 2 has the crawler belt P wound around the left and right ends in the traveling direction to rotate the hydraulic excavator 1 forward and backward, and the revolving frame 3 is mounted on the upper surface side in a state where the revolving frame 3 can be swiveled. .
The turning frame 3 can turn in any direction on the lower traveling body 2, and a work machine 4, a counterweight 5, an engine 6, and a cab 10 are mounted on the upper surface thereof.

  The work machine 4 is configured to include a boom 11, an arm 12 attached to the tip of the boom 11, and a bucket 13 attached to the tip of the arm 12. Then, the work machine 4 performs work on a civil engineering work site where excavation of earth and sand, gravel, and the like is performed while the boom 11, the arm 12, the bucket 13, and the like are moved up and down by the hydraulic cylinders 11a, 12a, and 13a. .

The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and hardened. The counterweight 5 is provided at the rear part of the revolving frame 3 to balance the vehicle body during mining. ing.
The engine 6 is a drive source for driving the lower traveling body 2 and the work implement 4, and is disposed at a position adjacent to the counterweight 5 on the turning frame 3 (see FIG. 2).

The equipment room 9 is disposed on the revolving frame 3 behind the work machine 4 and accommodates a hydraulic oil tank 30 described later, a fuel tank (not shown), an operation valve, and the like.
The cab 10 is a driver's cab where an operator of the excavator 1 gets on and off, and is disposed on the left front side on the revolving frame 3 on the left side of the work machine 4 so that the tip of the work machine 4 can be seen. .

[Configuration near the hydraulic oil tank 30]
The hydraulic oil tank 30 according to the present embodiment is an oil storage tank for storing hydraulic oil (oil) that is circulated by a hydraulic pump. As shown in FIGS. 2 and 3, the hydraulic oil tank 30 is on the base portion of the swivel frame 3. It is located on the right side and in the vicinity of the center in the front-rear direction. Further, as shown in FIGS. 4 and 5, the hydraulic oil tank 30 is disposed close to the partition plate 21 that is disposed so as to be sandwiched between the hydraulic oil tank 30 and the engine 6. Furthermore, the hydraulic oil tank 30 is connected to three return pipes 41 as shown in FIGS. The detailed configuration of the hydraulic oil tank 30 will be described in detail later.

The partition plate 21 is a plate material configured by combining a plurality of panels, and has a substantially flat surface at a portion close to the hydraulic oil tank 30.
The return pipe 41 is a pipe that connects the main valve 45 (see FIGS. 3 and 5) and the hydraulic oil tank 30, and as shown in FIGS. 4 and 5, the inclined surface 51a (see FIG. 5) in the hydraulic oil tank 30. 8)) is connected to the pipe connecting portion 31 attached to.

As shown in FIG. 8, the pipe connection portion 31 is an inclination included in the first member 51 out of two substantially U-shaped members (the first member 51 and the second member 52) constituting the hydraulic oil tank 30. It is attached to an opening (connection opening) 51aa formed in the surface 51a.
The delivery pipe 42 is a pipe connecting the main valve 45 and the hydraulic pump 46 (both see FIG. 3 and FIG. 5), and passes through a gap between the hydraulic oil tank 30 and the partition plate 21 that are arranged close to each other. Then, the hydraulic oil sent out from the hydraulic pump 46 is sent to the main valve 45.

(Configuration of hydraulic oil tank 30)
As shown in FIGS. 6, 7 (a) and 7 (b), the hydraulic oil tank 30 includes a pipe connecting portion 31 to which one end of the return pipe 41 described above is connected, a filter 43, a strainer 44, It has.
As shown in FIG. 6, the filter 43 is attached to a ceiling surface 52 a (see FIG. 8) in the hydraulic oil tank 30. The filter 43 is connected to the pipe connection portion 31 to which the return pipe 41 is connected, and filters out impurities contained in the circulating hydraulic oil supplied from the return pipe 41. The hydraulic oil that has passed through the filter 43 is dropped into the tank as it is.

  As shown in FIG. 6, the strainer 44 is attached to an opening 52 ca (see FIG. 8) formed near the center of the bottom surface 52 c of the hydraulic oil tank 30. The strainer 44 filters the hydraulic oil when the hydraulic oil dripped from the filter 43 and stored in the tank is discharged from the bottom surface by the suction force of the hydraulic pump 46 (FIGS. 6 and 7 (b)). )).

  As shown in FIGS. 7A and 7B, the filter 43 and the strainer 44 are arranged at positions shifted so as not to overlap each other in plan view. More specifically, the filter 43 and the strainer 44 are arranged along diagonal lines on the ceiling surface 52a of the hydraulic oil tank 30, respectively. Thereby, the area of the ceiling surface 52a can be minimized, and the size of the hydraulic oil tank 30 in a plan view can be minimized. A separation plate 43 a is disposed between the filter 43 and the strainer 44. Thereby, even when a large amount of air is mixed in the hydraulic oil dropped into the tank through the filter 43, the hydraulic oil containing air is prevented from being discharged through the strainer 44 as it is. be able to. That is, the hydraulic oil that has passed through the filter 43 flows into the strainer 44 after being stored in the hydraulic oil tank 30 for a certain period of time. For this reason, air can be gradually removed from the hydraulic oil while being stored in the tank. As a result, it is possible to prevent problems such as the discharge amount from the hydraulic pump 46 becoming unstable due to the air biting into the hydraulic pump 46 disposed on the downstream side of the strainer 44.

Furthermore, as shown in FIG. 8, the hydraulic oil tank 30 is configured by combining a first member 51 and a second member 52 that are substantially U-shaped members.
The first member 51 has three vertical surfaces 51b, 51c, 51d arranged substantially perpendicular to each other, and an inclined surface 51a arranged so as to obliquely connect the vertical surfaces 51b and 51c. is doing. The inclined surface 51a has an opening 51aa at the top, and the above-described pipe connecting portion 31 is attached to the inclined surface 51a. The inclined surface 51a and the three vertical surfaces 51b to 51d constitute a part of the side surface of the hydraulic oil tank 30 and intersect each other substantially vertically in one direction so as to be substantially U-shaped in plan view. Is arranged. The vertical surfaces 51b and 51d are disposed substantially parallel to each other, and the vertical surface 51c is disposed substantially parallel to a vertical surface 52b of the second member 52 described later.

  The second member 52 has three planes (a ceiling surface 52a, a vertical surface 52b, and a bottom surface 52c) arranged substantially perpendicular to each other. The ceiling surface 52a and the bottom surface 52c are disposed substantially parallel to each other, and constitute the upper surface and the lower surface of the hydraulic oil tank 30. And the ceiling surface 52a has opening 52aa used as the inspection opening of the strainer 44, and opening 52ab to which the upper part of the filter 43 is attached. The bottom surface 52 c has an opening 52 ca to which the strainer 44 is attached. The vertical surface 52b constitutes the side surface of the hydraulic oil tank 30 together with the other vertical surfaces 51b to 51d of the first member 51 and the inclined surface 51a.

The first member 51 and the second member 52 are slid and moved in the horizontal direction and then joined together by welding.
In this embodiment, the inclined surface 51a as a new surface is provided with respect to the substantially rectangular parallelepiped hydraulic oil tank 30 by the above configuration. And the piping connection part 31 to which the return piping 41 is connected is attached with respect to this newly provided inclined surface 51a.

  As a result, even if the side surface of the hydraulic oil tank 30 is disposed close to the partition plate 21 on the revolving frame 3 and the other surroundings are closed by parts such as the main valve 45, the return The pipe connection part 31 for the pipe 41 can be provided on the inclined surface 51a. As a result, the space on the swivel frame 3 can be saved by enlarging the size of the hydraulic oil tank 30 in the front-rear direction and reducing the installation interval of each component while ensuring a sufficient space for pipe connection. Can be planned.

[Features of the hydraulic oil tank 30]
(1)
In the hydraulic oil tank 30 of this embodiment, as shown in FIG. 6 and the like, there are three sets of two substantially parallel surfaces (vertical surfaces 51b and 51d, vertical surfaces 51c and 52b, and a ceiling surface 52a and a bottom surface 52c). And an inclined surface 51a. The inclined surface 51a is provided with a pipe connection portion 31 that is a connection portion with a return pipe 41 from which hydraulic oil is returned from the outside into the tank. The vertical surfaces 51b to 51d, 52b, the ceiling surface 52a, and the bottom surface 52c are provided. Are inclined with respect to at least one of the

  As a result, even when other parts are arranged close to the four sides of the four side surfaces (vertical surfaces 51b to 51d, vertical surface 52b) constituting the hydraulic oil tank 30 having a substantially rectangular parallelepiped shape, the hydraulic oil tank 30 is newly provided. Since the pipe connection part 31 is provided on the inclined surface 51a, a sufficient pipe connection space can be secured. As a result, the size of the hydraulic oil tank 30 mounted on the hydraulic excavator 1 can be enlarged, and other parts can be arranged close to the hydraulic oil tank 30, so that space saving on the revolving frame 3 can be saved. You can plan.

(2)
In the hydraulic oil tank 30 of the present embodiment, as shown in FIG. 6 and the like, a part of the side surface that intersects the inclined surface 51a including the pipe connecting portion 31 described above substantially perpendicularly to the ceiling surface 52a and the bottom surface 52c. It is formed as.
As a result, other parts and the like can be disposed close to the hydraulic oil tank 30 while ensuring a sufficient connection space for the return pipe 41 from the side surface side. As a result, each component can be efficiently arranged in the space on the revolving frame 3.

(3)
As shown in FIG. 8, the hydraulic oil tank 30 of the present embodiment is configured by combining two substantially U-shaped parts (first member 51 and second member 52).
Thereby, the hydraulic oil tank 30 including the inclined surface 51a can be easily configured by sliding and moving in the horizontal direction and combining them by welding.

(4)
As shown in FIG. 6 and the like, the hydraulic oil tank 30 of this embodiment includes a strainer 44 for filtering the hydraulic oil circulated by the hydraulic pump 46. The strainer 44 is disposed near the center of the bottom surface 52 c of the hydraulic oil tank 30.
As a result, even when the hydraulic excavator 1 is in operation, even when vibration is applied to the vehicle body and the liquid level of the hydraulic oil stored in the hydraulic oil tank 30 is shaken, the hydraulic oil tank 30 is arranged at substantially the center. Therefore, it is possible to minimize the amount of hydraulic oil sucked into the strainer 44 from becoming unstable.

(5)
In the hydraulic oil tank 30 of the present embodiment, as shown in FIGS. 7A and 7B, impurities contained in the hydraulic oil supplied from the return pipe 41 connected to the pipe connection portion 31 are removed. A filter 43 is provided. And the filter 43 is arrange | positioned in the position shifted so that it may not overlap with respect to the strainer 44 in planar view.

  As a result, the hydraulic oil dropped into the hydraulic oil tank 30 via the filter 43 can be prevented from flowing directly into the strainer 44. As a result, even when the hydraulic oil dropped from the filter 43 contains a large amount of air, the air can be released before the hydraulic oil is sucked into the strainer 44. Therefore, it is possible to prevent the discharge amount from becoming unstable due to air biting into the hydraulic pump 46 or the like.

(6)
In the present embodiment, as shown in FIGS. 2 to 5, as the arrangement structure of each component on the turning frame 3, the above-described hydraulic oil tank 30 and the partition plate 21 arranged in proximity to the hydraulic oil tank 30. And.
Thereby, even when the hydraulic oil tank 30 is disposed close to the partition plate 21, the space on the swivel frame 3 can be saved while sufficiently securing a pipe connection space connected to the hydraulic oil tank 30. Can do. Alternatively, the longitudinal length of the hydraulic excavator 1 in the hydraulic oil tank 30 can be increased.

(7)
In this embodiment, as shown in FIG. 3, by adopting the above-described hydraulic oil tank 30, a portion of the partition plate 21 facing the hydraulic oil tank 30 can be made flat.
Thereby, in order to ensure a piping connection space, it is not necessary to provide a complicated cut shape or the like on the partition plate side. As a result, the shape of the partition plate 21 can be simplified.

(8)
As shown in FIGS. 1 and 2, the hydraulic excavator 1 of the present embodiment has a structure including the hydraulic oil tank 30 and the partition plate 21 described above.
As a result, as described above, even when each component including the partition plate 21 is disposed close to the side surface of the hydraulic oil tank 30 in the space on the revolving frame 3, a sufficient space for pipe connection is ensured. Can do. Therefore, the space on the revolving frame 3 can be saved, and the size of the hydraulic oil tank 30 can be enlarged in the same size space.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.
(A)
In the said embodiment, the inclined surface 51a to which the pipe connection part 31 is attached was demonstrated and demonstrated as an example formed as a part of side surface in the hydraulic oil tank 30 along a substantially vertical direction. However, the present invention is not limited to this.

For example, a surface that obliquely intersects the substantially vertical direction may be used as the inclined surface including the pipe connection portion.
Even in this case, space is saved by increasing the size of the oil storage tank or reducing the installation interval of each component arranged in the space on the swivel frame 3 while ensuring a sufficient piping connection space for the oil storage tank. As described above, the same effect as described above can be obtained.

(B)
In the said embodiment, the example using the return piping 41 was given and demonstrated as piping connected with respect to the piping connection part 31 provided in the inclined surface 51a. However, the present invention is not limited to this.
For example, the type of pipe connected to the pipe connecting portion may be appropriately determined according to the nature of the oil storage tank to be connected, such as connecting another pipe.

(C)
In the said embodiment, the hydraulic oil tank 30 demonstrated and demonstrated the example comprised combining two substantially U-shaped components (the 1st member 51 and the 2nd member 52). However, the present invention is not limited to this.
For example, it may be a tank formed in a substantially rectangular parallelepiped shape from the beginning, or a tank configured by covering a box-shaped vessel with a lid from above.

  Further, even when the oil storage tank is configured by combining two substantially U-shaped parts, the oil storage tank may be combined not only by sliding in the horizontal direction but also by sliding in the vertical direction. However, it is more preferable to be configured as in the above embodiment in that it is easy to form an inclined surface by combining two parts by sliding in the horizontal direction.

(D)
In the said embodiment, the hydraulic oil tank 30 was mentioned as an example and demonstrated as an oil storage tank which concerns on this invention. However, the present invention is not limited to this.
For example, the present invention can naturally be applied to other oil storage tanks such as a fuel tank disposed on a revolving frame.

(E)
In the said embodiment, the hydraulic excavator 1 was mentioned as an example and demonstrated as a construction machine carrying the hydraulic-oil tank (oil storage tank) 30 which concerns on this invention. However, the present invention is not limited to this.
For example, the construction machine including the oil storage tank according to the present invention may be various construction machines including equipment driven by hydraulic pressure, such as a bulldozer, a wheel loader, a forklift, and the like.

  The oil storage tank of the present invention efficiently arranges each component by increasing the size of the oil storage tank or reducing the arrangement area of each component arranged in the space on the revolving frame where the oil storage tank is arranged. Therefore, the present invention is widely applicable to various tanks to which pipes and the like are connected.

The side view which shows the structure of the external appearance of the hydraulic shovel which concerns on one Embodiment of this invention. The perspective view which shows the structure on the turning frame of the hydraulic shovel of FIG. The top view which shows the structure on the turning frame of FIG. The perspective view which shows the structure of a hydraulic-oil tank periphery among the structures on the turning frame of FIG. 2 and FIG. The perspective view which shows the structure of a hydraulic-oil tank periphery among the structures on the turning frame of FIG. 2 and FIG. The perspective view which shows the structure of the hydraulic oil tank contained in FIG. (A) And (b) is the top view and front view of a hydraulic-oil tank of FIG. The perspective view which shows the combination of the substantially U-shaped member which comprises the hydraulic oil tank of FIG.

Explanation of symbols

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Turning frame 4 Working machine 5 Counterweight 6 Engine 9 Equipment chamber 10 Cab 11 Boom 11a Hydraulic cylinder 12 Arm 12a Hydraulic cylinder 13 Bucket 13a Hydraulic cylinder 21 Partition plate 30 Hydraulic oil tank (oil storage tank)
31 Pipe connection part 41 Return pipe 42 Delivery pipe 43 Filter 43a Separator plate 44 Strainer 45 Main valve 46 Hydraulic pump 51 First member 51a Inclined surface 51aa Opening (connection opening)
51b Vertical surface 51c Vertical surface 51d Vertical surface 52 Second member 52a Ceiling surface 52aa Opening 52ab Opening 52b Vertical surface 52c Bottom surface 52ca Opening

Claims (5)

An oil storage tank configured by combining three sets of two surfaces substantially parallel to each other, and storing oil in an internal space,
Three sets of the two faces;
An inclined surface that is connected obliquely to any of the surfaces and has a connection opening through which a pipe that supplies oil that returns from the outside or is sent to the outside passes;
Oil storage tank equipped with. The inclined surface is disposed on the side surface side that intersects substantially perpendicularly to the bottom surface and the ceiling surface among the two surfaces of the three sets.
The oil storage tank according to claim 1. It is configured by combining a substantially U-shaped first member and a second member,
The oil storage tank according to claim 1 or 2. A strainer that is housed in an internal space for filtering the oil;
The strainer is disposed at a substantially central portion on the bottom surface constituting the internal space.
The oil storage tank according to any one of claims 1 to 3. It is disposed above the strainer, and further includes a filter that removes foreign matter from the oil supplied from the outside through the pipe and drops the oil downward.
The filter is disposed at a position that does not overlap the strainer in plan view.
The oil storage tank according to any one of claims 1 to 4.

Images