JP2004068288A - Hydraulic oil tank of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic oil tank for a construction machine capable of obtaining versatility applicable for various kinds of machines and favorable maintenance. <P>SOLUTION: A drain port (30) is formed in a suction port block (20) provided at the lower part of a hydraulic oil tank body (11). A drain plug (31) opening/closing the drain port (30) is preferably arranged at the side of the suction port block (20). A hydraulic oil drain passage (40) communicating with the drain port through a drain plug (41) is preferably arranged separately from a screw hole (42) for screwing the drain plug (41). The hydraulic oil drain passage (40) may be formed in a drain plug (46). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hydraulic oil tank for a construction machine.
[0002]
[Prior art]
Construction machinery is generally configured to drive main operations such as operation of a work machine by hydraulic pressure, and for this purpose, a large hydraulic oil tank is provided, but this hydraulic oil tank has a large volume. Therefore, the place where it can be arranged is limited to some extent. As a result, in many cases, it becomes difficult to attach and detach the drain plug provided on the lower surface of the hydraulic oil tank, which causes a problem that maintenance is not good at the time of maintenance such as replacement of hydraulic oil.
[0003]
Various hydraulic oil tanks have been considered as means for solving the above-mentioned problems. For example, Japanese Patent Application Laid-Open No. 2002-81093 discloses that a hydraulic oil discharge path is provided on the lower surface of a hydraulic oil tank to improve maintainability. Means for realizing a hydraulic oil tank are disclosed.
[0004]
A hydraulic oil tank according to the related art will be described with reference to FIGS. 12 to 14 by taking the structure disclosed in the above-mentioned JP-A-2002-81093 as an example. FIG. 12 is a side view of a hydraulic shovel to which a hydraulic oil tank according to the prior art is applied, FIG. 13 is a front sectional view of the hydraulic oil tank according to the related art, and FIG. It is principal part sectional drawing of the hydraulic oil tank by a prior art.
[0005]
12 to 14, the hydraulic excavator 50 has an upper revolving unit 52 mounted on an upper portion of a lower traveling unit 51, and has a working machine 53 in front of the upper revolving unit 52. A hydraulic oil tank 55 is disposed on the upper right side of the revolving frame 54 of the upper revolving unit 52, and the hydraulic oil tank 55 is supported on the upper portion of the revolving frame 54 by support members 56, 57, 60. , Its lower surface is at a height h above the revolving frame 54.
[0006]
The support member 56 includes a pipe member 64 and a flange 65 to form a hydraulic oil discharge passage 70 therein. A drain plug 81 is screwed into a screw hole 80 provided in the flange 65 from below. The frame 54 is provided with an opening 67 that allows the drain plug 81 to be attached and detached.
[0007]
12 to 14, the lower surface of the hydraulic oil tank 55 is arranged at a height h above the frame 54 so that the suction port 63 protruding from the lower surface of the hydraulic oil tank 55 does not interfere with the lower frame 54. Also in this case, the drain plug 81 is located near the frame 54, so that it is easy to extract the hydraulic oil when replacing the hydraulic oil.
[0008]
[Problems to be solved by the invention]
However, in the above-described hydraulic oil tank 55, since a long hydraulic oil discharge passage 70 is formed on the lower surface of the hydraulic oil tank 55 by the pipe member 64 and the like and is used as the support member 56, the following problem occurs. is there.
(1) The cost is increased by forming the long hydraulic oil discharge passage 70 with the pipe member 64 or the like.
(2) Two projecting portions from the lower surface of the hydraulic oil tank 55 are the suction port 63 and the support member 56 as the hydraulic oil discharge passage 70. At this time, the arrangement position of the projecting portion of the support member 56 as the hydraulic oil discharge path 70 cannot be arbitrarily selected, and is limited to the lower corner of the hydraulic oil tank 55. In addition, the support member 56 serving as the oil discharge path 70 may have a crack in a welded portion or the like during a long-term use, and this crack is directly linked to oil leakage. As a result, the easiness of application of the hydraulic oil tank 55 to multiple models is impaired.
[0009]
The present invention has been made in view of the above-described problems, and has as its object to provide a hydraulic oil tank for a construction machine that can realize versatility applicable to various types and good maintainability.
[0010]
Means for Solving the Problems, Functions and Effects
In order to achieve the above object, a first invention provides a hydraulic oil tank of a construction machine, wherein a suction port block is provided at a lower portion of a hydraulic oil tank body, and a drain port is formed in the suction port block. ]
According to the first invention, the following actions and effects can be obtained.
Since the drain port is formed in the suction port block provided at the lower portion of the hydraulic oil tank body, the drain port can be disposed at the lowermost portion of the hydraulic oil tank without using a pipe material or the like as in the related art. Thereby, it is possible to facilitate the operation of extracting the hydraulic oil at the time of replacing the hydraulic oil at a low cost.
Further, the projecting portion of the lower surface of the hydraulic oil tank is only the suction port block, and the horizontal position of the projecting portion can be arbitrarily selected within the lower surface of the hydraulic oil tank.
As a result, the hydraulic oil tank can be easily applied to various types of hydraulic oil tanks.
[0012]
According to a second aspect, in the first aspect, a drain plug for opening and closing the drain port is provided on a side surface of the suction port block.
[0013]
According to the second invention, in addition to the effect of the first invention, the hydraulic oil does not fall onto the hand when the drain plug is pulled out, so that the hydraulic oil does not scatter. Therefore, there is no dirt due to the hydraulic oil when replacing the hydraulic oil, and the workability can be improved.
[0014]
According to a third aspect, in the first aspect, a hydraulic oil discharge passage communicating with the drain port via the drain plug is provided separately from a screw hole for screwing a drain plug for opening and closing the drain port.
[0015]
According to the third invention, it is possible to discharge the hydraulic oil from the hydraulic oil discharge path without loosening by merely loosening the screw of the drain plug. It is also possible to connect a recovery hose or the like to the hydraulic oil discharge path to discharge the hydraulic oil. As a result, scattering of the hydraulic oil can be completely prevented.
[0016]
In a fourth aspect based on the third aspect, the hydraulic oil discharge passage is formed in the drain plug.
[0017]
According to the fourth aspect, the same operation and effect as in the third aspect can be obtained only by screwing a drain plug having a hydraulic oil discharge passage therein to the drain port formed in the suction port block. . Therefore, the suction port block can have a very simple structure.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a hydraulic oil tank of a construction machine according to the present invention will be described in detail with reference to FIGS.
[0019]
First, a first embodiment will be described with reference to FIGS.
FIG. 1 is a side view of a hydraulic shovel to which a hydraulic oil tank according to the present invention is applied, FIG. 2 is a top view of a main part of the hydraulic shovel, and FIG. 3 is a QQ view of FIG.
[0020]
1 to 3, a hydraulic excavator 1 includes a lower traveling body 2 having a crawler-type traveling device, and an upper revolving body 3 rotatably mounted on an upper portion of the lower traveling body 2. A work machine 4 is attached to the front part of a swing bracket 5 via a swing bracket 5 so as to be able to swing horizontally and horizontally, and work is performed by a swing cylinder 6 attached between the swing bracket 5 and the swing frame of the upper swing body 3. The machine 4 is a so-called swing type excavator that swings right and left. A hydraulic oil tank 10 is provided so as to straddle above the swing cylinder 6.
[0021]
The hydraulic oil tank 10 has a bottom plate left edge 12a on the main frame 9a on the upper swing body 3 via the inner bracket 7, and a bottom plate right edge 12b on the bottom frame 9b of the upper swing body 3 via the outer bracket 8. Each is supported. A suction port block 20 is provided on the lower surface of the hydraulic oil tank 10 at a position avoiding the swing cylinder 6 in plan view.
[0022]
FIG. 4 is a sectional side view of a main part of the hydraulic oil tank of the first embodiment, and FIG. 5 is a bottom view of the same, and is a P view of FIG. 4 and 5, a suction port block 20 is fixed around the lower surface 12c of the bottom plate 12 of the main body 11 of the hydraulic oil tank 10 by welding 21 or the like. In the suction port block 20, a suction port 22 and a drain port 30 are formed. The upper end of the drain port 30 is opened at the upper surface 12d of the bottom plate 12 by a hole 12e provided in the bottom plate 12, and a drain plug 31 is screwed into a threaded portion at the lower end of the drain port 30. . A maintenance hole 9c of a required size is formed in a portion of the bottom frame 9b of the upper swing body 3 below the drain plug 31.
[0023]
With the configuration of the first embodiment, the following operation and effect can be obtained.
(1) Since the drain port 30 is provided in the suction port block 20 integrally fixed to the bottom plate 12 of the hydraulic oil tank 10 without using a pipe material or the like as shown in the prior art, when the hydraulic oil is changed, A configuration that enables the operation oil removal work to be easily performed is realized at low cost.
(2) The protruding portion on the lower surface of the hydraulic oil tank 10 is only the suction port block 20, and the horizontal position of this protruding portion can be arbitrarily selected within the lower surface of the hydraulic oil tank 10. This facilitates disposing the hydraulic oil tank 10 across the swing cylinder 6.
(3) As a result of the above (1) and (2), the hydraulic oil tank 10 according to the present invention has versatility that can be easily applied to various types of construction machines.
[0024]
Next, a second embodiment will be described with reference to FIG.
FIG. 6 is a cross-sectional side view of a main part of a hydraulic oil tank according to the second embodiment. Note that the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted.
In FIG. 6, the lower end of the drain port 30 is formed in the suction port block 20 so as to face horizontally, and the drain plug 31 is screwed to the side surface of the suction port block 20.
[0025]
According to the second embodiment, when the drain plug 31 is pulled out in the direction of the arrow M shown in the drawing, the hydraulic oil is discharged in the direction of the arrow N shown in FIG. The oil does not fall on the hands of the workers, so that the hydraulic oil does not splash. For this reason, contamination by hydraulic oil can be prevented, and workability at the time of hydraulic oil replacement can be improved. Other effects are the same as in the first embodiment, and a description thereof will be omitted.
[0026]
Although the drain plug 31 is provided on the front side surface of the suction port block 20 in FIG. 6, it is needless to say that the drain plug 31 may be provided on another side surface of the block 20 without being limited to this.
[0027]
Next, a third embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional side view of a main part of a hydraulic oil tank according to a third embodiment. Note that the same components as those in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted below.
In FIG. 7, an enlarged diameter portion 33 having a larger diameter than the upper small diameter portion is formed below the drain port 30 of the suction port block 20, and a stepped portion 34 is provided between the small diameter portion and the enlarged diameter portion 33. Is provided. A hydraulic oil discharge passage 40 penetrating inward and outward in the horizontal direction is formed in the side surface of the enlarged diameter portion 33. A drain plug 41 is screwed into a screw hole 42 screwed into the lower end of the enlarged diameter portion 33, and the conical surface 41 a at the tip of the drain plug 41 comes into contact with the stepped portion 34 and the drain port 30. Is sealed. The cylindrical portion 41 b located below the conical surface 41 a of the drain plug 41 has an outer diameter slightly smaller than the inner diameter of the enlarged diameter portion 33.
[0028]
Further, a sleeve 43 is connected to the outlet of the hydraulic oil discharge passage 40 by welding 43a or the like. This sleeve 43 prevents the hydraulic oil from flowing along the surface of the suction port block 20, and also prevents the hydraulic oil from flowing. It facilitates connection of a collection hose (not shown). A maintenance hole 9c of a required size is formed in a portion of the bottom frame 9b of the upper swing body 3 below the sleeve 43.
[0029]
According to the third embodiment, since the hydraulic oil discharge passage 40 is provided separately from the screw hole 42 into which the drain plug 41 is screwed, the operation can be performed without loosening the drain plug 41 only by loosening the screw. Oil can be drained. Further, a hydraulic oil recovery hose can be connected to the sleeve 43 attached to the outlet of the hydraulic oil discharge passage 40 to discharge the hydraulic oil. As a result, the hydraulic oil is smoothly discharged via the hydraulic oil discharge passage 40 and the sleeve 43 at the time of discharge, so that scattering of the hydraulic oil can be completely prevented. Other effects are the same as in the first embodiment, and a description thereof will be omitted.
[0030]
Although the hydraulic oil discharge passage 40 and the sleeve 43 are provided on the front side surface of the suction port block 20 in FIG. 7, the invention is not limited thereto, and may be provided on another side surface of the suction port block 20.
[0031]
Next, a fourth embodiment will be described with reference to FIGS. FIG. 8 is a bottom view of an essential part of a hydraulic oil tank according to a fourth embodiment, and FIG. 9 is a cross-sectional side view taken along the line EE of FIG. The same components as those in FIGS. 1 to 7 are denoted by the same reference numerals, and the description thereof will not be repeated.
[0032]
8 and 9, a small-diameter portion 35 extending horizontally from the lower end of the drain port 30 is formed in the suction port block 20, and an enlarged-diameter portion 36 is formed at the tip of the small-diameter portion 35. A stepped portion 37 is provided between the enlarged diameter portion 36. A drain plug 41 is screwed into a screw hole 42 screwed into the outer end of the enlarged diameter portion 36 (side surface of the suction port block 20), and the conical surface 41 a at the tip of the drain plug 41 is brought into contact with the stepped portion 37. The drain port 30 is sealed by being in contact therewith. The enlarged diameter portion 36 is provided with a hydraulic oil discharge passage 40 penetrating downward and to the outside, and a sleeve 43 is fixed to an outlet of the hydraulic oil discharge passage 40 by welding 43a or the like.
[0033]
According to the fourth embodiment, when hydraulic fluid is discharged by loosening the screw connection of the drain plug 41, leakage of hydraulic fluid from the screw hole 42 can be reduced. The other effects are the same as the effects in the third embodiment, and the description is omitted here.
[0034]
In FIG. 9, the drain plug 41 is arranged so as to make the suction port block 20 compact. However, the drain plug 41 is arranged at any position and in the suction port block 20 without being limited to this. Good.
[0035]
Next, a fifth embodiment will be described with reference to FIG. FIG. 10 is a cross-sectional side view of a main part of a hydraulic oil tank according to a fifth embodiment. Note that the same components as those in FIGS. 1 to 9 are denoted by the same reference numerals, and description thereof is omitted below.
[0036]
In FIG. 10, the enlarged diameter portion 33 formed at the lower end of the drain port 30 has a stepped conical surface 46a of the drain plug 46 screwed into a screw hole 47 screwed at the lower end of the enlarged diameter portion 33. It is sealed by contacting the attachment portion 34. In the drain plug 46, a deep hole 46d is drilled in the shaft core portion, and a required number of communication holes 46c for drilling the outer peripheral surface of the cylindrical portion 46b and the deep hole 46d are drilled. The outer diameter of the cylindrical portion 46b of the drain plug 46 is formed slightly smaller than the inner diameter of the enlarged diameter portion 33. The hydraulic oil discharge passage 40 is formed by the enlarged diameter portion 33, the communication hole 46c, and the deep hole 46d. Is formed.
[0037]
Further, a sleeve 46e is formed on the outer periphery of the lower end portion of the hydraulic oil discharge passage 40, thereby preventing the hydraulic oil from flowing along the surface of the drain plug 46, and a hydraulic oil collecting hose (not shown). Easy connection.
[0038]
According to the fifth embodiment, the drain port 30 is disposed in the suction port block 20, and the drain plug 46 having the hydraulic oil discharge passage 40 is screwed into the enlarged diameter portion 33 below the drain port 30. The same operation and effect as in the third to fourth embodiments can be obtained. Thus, the suction port block 20 can have a very simple structure.
[0039]
Next, a sixth embodiment will be described with reference to FIG. FIG. 11 is a sectional side view of a main part of a hydraulic oil tank according to a sixth embodiment. Note that the same components as those in FIGS. 1 to 10 are denoted by the same reference numerals, and description thereof will be omitted.
[0040]
In FIG. 11, a suction port block 20 includes an upper block 20a fixed to a bottom plate 12 of a hydraulic oil tank main body 11, and a lower block 20b integrally attached to a lower surface of the upper block 20a with a required number of bolts 20c. And A horizontal port at the lower end of the suction port 22 is formed in the lower block 20b, and a suction sleeve 20d is fixed to a horizontal port outlet (a side surface of the suction port block 20) of the suction port 22.
[0041]
According to the sixth embodiment, the direction, length, height, and the like of the suction sleeve 20d of the lower block 20b can be arbitrarily selected without affecting the hydraulic oil tank main body 11, so that design is free. The degree of application is increased, and application to multiple models becomes easier. Also, the removal and repair of the lower block 20b can be performed. Other effects are the same as those of the first embodiment, and a description thereof will not be repeated.
[0042]
Note that, in the present embodiment, an example is shown in which the suction port block 20 (FIG. 4) of the first embodiment is divided into two parts to form an assembling structure, but other second to fifth embodiments are described. The suction port block 20 of the embodiment (FIGS. 6 and 7 and FIGS. 9 and 10) can also be implemented in the same manner, and can be easily analogized. Further, the number of divisions is not limited to two.
[0043]
Although the embodiment of the hydraulic oil tank of the construction machine has been described above by taking the hydraulic excavator as an example, the present invention is not limited to the hydraulic excavator, and the hydraulic oil tank of another construction machine can be similarly implemented. It is possible, and the same operation and effect as described above can be obtained.
[0044]
As described above, according to the present invention, the following effects can be obtained.
Since the drain port is formed in the suction port block integrally provided at the lower part of the hydraulic oil tank, a configuration in which the drain port is provided at the lowermost part of the hydraulic oil tank can be performed at low cost. In addition, since the horizontal position of the suction port block can be arbitrarily selected within the bottom surface of the hydraulic oil tank, the position of the suction port block can be set according to the arrangement position of the hydraulic oil tank, making it easy to use various types of hydraulic oil tanks. Can be applied. Therefore, it is possible to provide a hydraulic oil tank for a construction machine that realizes versatility applicable to various types and good maintainability.
In addition, by arranging the drain plug on the side of the suction port block, hydraulic oil does not scatter when the drain plug is removed, so there is no dirt due to hydraulic oil when replacing hydraulic oil, improving workability. it can.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic shovel to which a hydraulic oil tank according to the present invention is applied.
FIG. 2 is a top view of a main part of FIG. 1;
FIG. 3 is a QQ view of FIG. 2;
FIG. 4 is a sectional side view of a main part of the hydraulic oil tank according to the first embodiment.
FIG. 5 is a P view of FIG. 4;
FIG. 6 is a cross-sectional side view of a main part of a hydraulic oil tank according to a second embodiment.
FIG. 7 is a cross-sectional side view of a main part of a hydraulic oil tank according to a third embodiment.
FIG. 8 is a bottom view of a main part of a hydraulic oil tank according to a fourth embodiment.
FIG. 9 is a sectional view taken along the line EE of FIG. 8;
FIG. 10 is a cross-sectional side view of a main part of a hydraulic oil tank according to a fifth embodiment.
FIG. 11 is a cross-sectional side view of a main part of a hydraulic oil tank according to a sixth embodiment.
FIG. 12 is a side view of a hydraulic shovel to which a hydraulic oil tank according to a conventional technique is applied.
13 is a detailed view of a main part of a section taken along line GG of FIG.
FIG. 14 is a sectional view of a main part of a hydraulic oil tank according to a conventional technique.
[Explanation of symbols]
Reference Signs List 1 hydraulic excavator, 6 swing cylinder, 9b bottom frame, 9c maintenance hole, 10 hydraulic oil tank, 11 hydraulic oil tank body, 12 bottom plate, 12c lower surface, 12d upper surface, 12e hole, 20 ... Suction port block, 20a ... Top block, 20b ... Bottom block, 20d ... Suction sleeve, 22 ... Suction port, 30 ... Drain port, 31 ... Drain plug, 33 ... Expanded portion, 34 ... Stepped portion, 35 ... Small diameter Part, 36: enlarged diameter part, 37: stepped part, 40: hydraulic oil discharge path, 41: drain plug, 41a: conical surface, 41b: cylindrical part, 42: screw hole, 43: sleeve, 46: drain plug, 46a: conical surface, 46b: cylindrical portion, 46c: communication hole, 46d: deep hole, 46e: sleeve, 47: screw hole.

Claims (4)

In hydraulic oil tanks of construction machinery,
A hydraulic oil tank for construction machinery, wherein a suction port block (20) is provided at a lower portion of a hydraulic oil tank body (11), and a drain port (30) is formed in the suction port block (20). The hydraulic oil tank for a construction machine according to claim 1,
A hydraulic oil tank for a construction machine, wherein a drain plug (31) for opening and closing the drain port (30) is disposed on a side surface of the suction port block (20). The hydraulic oil tank for a construction machine according to claim 1,
A hydraulic oil discharge passage (40) communicating with the drain port (30) via the drain plug (41) is provided separately from the screw hole (42) for screwing the drain plug (41) for opening and closing the drain port (30). A hydraulic oil tank for construction machinery, which is disposed. The hydraulic oil tank for a construction machine according to claim 3,
A hydraulic oil tank for a construction machine, wherein the hydraulic oil discharge passage (40) is formed in the drain plug (46).

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