JP2004322046A - Oil filter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil filter device capable of reducing an oil leak rate during filter replacement. <P>SOLUTION: This oil filter device is detachably mounted with a filter case 14 accommodating a filter element at the lower side of a filter base 13 connected to pipes 11 and 12. Further, shut-off valves 15 and 16 for protecting the discharge of a residual oil capable of blocking between the pipes and the filter base are interposed at a connection part between the pipes 11 and 12 and the filter base 13. Thus, before filter replacement by closing the shut-off valves 15 and 16, the residual oil within pipes can be prevented from discharging from the filter base 13 whose filter case 14 is detached, so that the oil leak rate can be reduced during filter replacement and surrounding contamination due to oil leak can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil filter device having a residual oil outflow prevention function.
[0002]
[Prior art]
In the hydraulic excavator, an upper swing frame is swingably mounted on a lower traveling body, an engine is mounted on the upper swing frame, and an oil filter device for filtering engine oil is provided near the engine. An oil tray is disposed below the filter device, and receives the engine oil flowing out of the oil filter device when the filter is replaced (for example, see Patent Document 1).
[0003]
Arranging the oil tray below such an oil filter device is limited to cases where there is a structural margin, and thus lacks versatility.
[0004]
On the other hand, in recent models of hydraulic excavators, as shown in FIG. 3 or 4, the hoses 2, 3 are pulled out from the filter base 1 directly attached to the engine to improve the maintainability at the time of filter replacement. There is a case where the oil filter device 4 is remotely installed in an easily accessible arbitrary place.
[0005]
For example, as shown in FIG. 3, in consideration of access from the ground side, the oil filter device 4 is remotely installed at a position lower than the original filter base 1, or the hoses 2 and 3 shown in FIG. There is a case where the oil filter device 4 is remotely installed in a place where a horizontal portion is formed in the hose route.
[0006]
In these oil filter devices 4, a filter case 6 with a built-in filter element is detachably mounted on a filter base 5.
[0007]
[Patent Document 1]
JP-A-2002-54177 (page 3, FIGS. 1 and 2)
[0008]
[Problems to be solved by the invention]
When the oil filter device 4 is remotely installed at a position lower than the original filter base 1 as shown in FIG. When a horizontal portion is formed on the route, there is a problem that the residual oil of the hose inner volume at the horizontal portion flows out as a larger amount of oil leakage than the filter base 5 from which the filter case 6 is removed at the time of filter replacement, and contaminates the surroundings.
[0009]
The present invention has been made in view of such a point, and an object of the present invention is to provide an oil filter device that can reduce the amount of oil leakage at the time of filter replacement.
[0010]
[Means for Solving the Problems]
The invention described in claim 1 provides a filter base to which a pipe is connected, a filter case with a built-in filter element detachably mounted on the filter base, and a pipe and a filter interposed at a connection portion between the pipe and the filter base. An oil filter device comprising a shutoff valve for preventing residual oil from leaking out between filter bases, and by closing the shutoff valve before replacing the filter to remove the filter case from the filter base, the residual oil in the piping is reduced. However, since it can be prevented from flowing out of the filter base from which the filter case has been removed, the amount of oil leakage at the time of filter replacement can be reduced, and the surrounding contamination due to the oil leakage can also be reduced.
[0011]
According to a second aspect of the present invention, in the oil filter device according to the first aspect, the filter case is mounted on a lower side of the filter base, and the residual oil in the pipe is confined in the pipe by a shut-off valve. By removing the filter case from the filter base while the residual oil in the filter case remains in the filter case, oil leakage from the filter case can be prevented.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIG. 1 and another embodiment shown in FIG.
[0013]
As shown in FIG. 1, a filter base 13 to which pipes 11 and 12 such as hoses are connected, a filter case 14 with a built-in filter element detachably mounted below the filter base 13, , 12 and a filter base 13, respectively, are provided with shutoff valves 15, 16 for preventing residual oil from flowing out, which can shut off the piping and the filter base.
[0014]
The filter base 13 is provided with a pair of oil inlet connection ports 17 and 18 at one side, an oil outlet port 19 at the center, and a connection 21 at the other side. The plate 22 is formed integrally. The mounting plate 22 is fixed to an arbitrary frame member 23 around the engine.
[0015]
One oil inlet connection port 17 is connected to a discharge port of an oil pump driven by an engine via a shut-off valve 15 and a pipe 11 such as a hose, and the other oil inlet connection port 18 is The blind plug 25 is closed by a so-called plug.
[0016]
The oil outlet side connection port 19 is connected to each part to be lubricated with the engine via a pipe 12 such as a sampling oil extraction fitting 26, a pipe joint 27, a shutoff valve 16 and a hose. The engine oil returned from the engine lubrication target to the engine oil pan is circulated through the strainer to the suction port of the oil pump.
[0017]
The filter case 14 has a thread groove formed in the upper opening, and is screwed to the outer peripheral surface of the filter base 13. The filter case 14 can be screwed to the filter base 13 by forward rotation, and can be easily removed from the filter base 13 by reverse rotation. Inside the filter case 14, a filter element such as filter paper is incorporated.
[0018]
The shut-off valves 15 and 16 each have an on-off valve body (not shown) that is rotated by an external operation unit 29 fitted in the respective valve main body 28.・ The filter base is in the closed state with the filter base blocked.
[0019]
Then, during a normal filtering operation for filtering the contamination in the oil by the oil filter device, the shut-off valves 15 and 16 are opened to communicate the pipe 11 with the oil inlet side connection port 17 of the filter base 13. At the same time, the oil outlet connection port 19 of the filter base 13 communicates with the pipe 12.
[0020]
On the other hand, prior to removing the filter case 14 from the filter base 13 in replacing the filter, the shut-off valves 15 and 16 are respectively closed to shut off the passages from the pipes 11 and 12 to the filter base 13, so that the pipe 11 is removed. , 12 has a horizontal portion at the same level as the hose connection portion or a portion higher than the hose connection portion, the residual oil in the pipe of the hose content integration is prevented from moving into the filter base 13 and the filter case is prevented. Since the residual oil in the piping can be prevented from flowing out of the filter base 13 from which the filter 14 has been removed, the amount of oil leakage at the time of filter replacement can be reduced, and the surrounding contamination due to the oil leakage can also be reduced.
[0021]
In the embodiment shown in FIG. 1, since the filter case 14 is mounted below the filter base 13, residual oil in the pipes is confined in the pipes 11 and 12 by the shutoff valves 15 and 16. At the same time, by removing the filter case 14 from the filter base 13 while the residual oil in the filter case remains in the filter case 14, oil leakage from the filter case 14 can be prevented.
[0022]
FIG. 2 shows another embodiment, which is an oil filter device different from that of FIG. 1 in that a filter case 14 is installed upside down on a filter base 13. The point in which the shutoff valves 15 and 16 for preventing residual oil outflow that can shut off between the pipe and the filter base are interposed at the connection part of the second embodiment is the same as the embodiment shown in FIG. Are denoted by the same reference numerals, and description thereof is omitted.
[0023]
As described above, in the oil filter device in which the height difference has occurred due to the remote installation, the amount of oil leaking from the filter base 13 can be reduced when the filter is replaced by removing the filter case 14 from the filter base 13, and the surroundings due to the oil leak can be reduced. Can be reduced.
[0024]
In addition, the shutoff valves 15 and 16 facilitate opening and closing operations between the piping and the filter base in a short time without soiling the hands, thereby improving workability.
[0025]
【The invention's effect】
According to the first aspect of the present invention, by closing the shut-off valve before replacing the filter to remove the filter case from the filter base, it is possible to prevent residual oil in the pipe from flowing out of the filter base from which the filter case has been removed. Since the oil leakage can be prevented, the amount of oil leakage at the time of filter replacement can be reduced, and the surrounding contamination due to the oil leakage can also be reduced.
[0026]
According to the second aspect of the present invention, the residual oil in the pipe is confined in the pipe by the shutoff valve, and the filter case is removed from the filter base while the residual oil in the filter case is stored in the filter case. Oil leakage from inside the case can also be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one embodiment of an oil filter device according to the present invention.
FIG. 2 is a perspective view showing another embodiment of the oil filter device according to the present invention.
FIG. 3 is a perspective view showing an example of a conventional remotely installed oil filter device.
FIG. 4 is a perspective view showing another example of the conventional remotely installed oil filter device.
[Explanation of symbols]
11, 12 Piping 13 Filter base 14 Filter case 15, 16 Shut-off valve

Claims (2)

A filter base to which the piping is connected,
A filter case with a built-in filter element detachably mounted on the filter base,
An oil filter device comprising: a shutoff valve for preventing residual oil from flowing out, which is interposed at a connection portion between a pipe and a filter base and can shut off between the pipe and the filter base. The oil filter device according to claim 1, wherein the filter case is mounted below the filter base.

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