Filter device

Abstract

To provide a filter device having a simple configuration.SOLUTION: A filter device includes: a rod-like member; an end cap provided with a first end being one end of the rod-like member; a filter element provided in the end cap and having a cylindrical filter medium; and a cover provided with a second end (end opposite to the first end) of the rod-like member, for attaching the end cap and the filter element to a tank. The rod-like member has a length longer than the filter element and is provided so as to penetrate the filter element along a central axis of the filter element.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a filter device. [Background technology]

[0002] Patent document 1 discloses a filter device comprising a filter housing in which a replaceable filter element is received and a filter head for fixing the filter housing to a third component member such as a tank wall of a storage tank, the filter housing being articulated and supported on the filter head by a support portion that provides one or more degrees of freedom. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2022-547300 Summary of the Invention [Problem to be solved by the invention]

[0004] FIG. 10 is a diagram showing an outline of the invention described in Patent Document 1. The two-dot chain line in FIG. 10 indicates the flow of liquid. In the invention described in Patent Document 1, a filter housing and a filter element are provided in a filter head and an upper end cap provided at the top end of a tank, and a lower end cap is fitted over a mounting socket provided in the tank. In addition, in the invention described in Patent Document 1, fluid flows into the hollow portion of the filter element through a lower through-hole in the end cap and is filtered as it flows from the inside to the outside of the filter element. The filtered liquid then flows into the space between the filter element and the filter housing. The liquid then flows out of the interior of the filter housing (filter device) into the tank through a fluid passage formed in the filter housing.

[0005] However, the invention described in Patent Document 1 requires a filter housing that surrounds the filter element, resulting in a large number of parts. In addition, the structure of the filter head is complex, resulting in a large number of parts.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a filter device with a simple configuration. [Means for solving the problem]

[0007] In order to solve the above problems, the filter device of the present invention comprises, for example, a rod-shaped member, an end cap provided at one end of the rod-shaped member, a filter element provided at the end cap and having a cylindrical filter medium, and a cover provided at the other end of the rod-shaped member for attaching the end cap and the filter element to a tank, wherein the rod-shaped member is longer than the length of the filter element and is provided so as to penetrate the filter element along the central axis of the filter element.

[0008] Furthermore, the filter device according to the present invention is, for example, a filter device provided in a tank for storing oil, and comprises a filter element having a cylindrical filter medium, an end cap provided on the filter element, a rod-shaped member having one end connected to the end cap, and a cover connected to the other end of the rod-shaped member and provided on the tank so as to cover an opening provided in the tank, wherein the rod-shaped member, the filter element, and the end cap are arranged in the tank, the rod-shaped member is longer than the length of the filter element and is provided so as to penetrate the filter element along the central axis of the filter element, the end cap has a mating portion with which an inlet portion of the tank is mated, and the end cap is provided with a hole that connects the inlet portion with the hollow portion of the filter medium.

[0009] According to the filter device of the present invention, a rod-shaped member longer than the length of the filter element is provided so as to penetrate the filter element along the central axis of the filter element, with one end of the rod-shaped member being attached to the end cap attached to the filter element and the other end being attached to the cover, thereby achieving a filter device with a simple configuration.

[0010] The cover may have a plate-like member, a protrusion provided on the plate-like member, the protrusion having a hole formed therein into which the rod-like member is inserted, and a reinforcing portion provided around the protrusion for reinforcing the protrusion. This allows the reinforcing portion to distribute the load, resulting in a sturdy filter device despite its simple configuration.

[0011] The rod-shaped members may include a first rod-shaped member provided on the cover, a second rod-shaped member provided on the end cap, and a connecting member connecting the first rod-shaped member and the second rod-shaped member, the connecting member being provided between the filter element and the cover. This allows the rod-shaped members to be disassembled into the first rod-shaped member and the second rod-shaped member, shortening the distance required to pull out the filter element when replacing it and facilitating replacement of the filter element and maintenance of the filter device.

[0012] The rod-shaped member may have a flange portion provided between the cover and a plate provided at an end of the filter medium not adjacent to the end cap, and an elastic member may be provided between the flange portion and the plate, so that the filter element is movable in a first direction parallel to the central axis. This allows the function of a relief valve to be achieved with a simple configuration. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a filter device with a simple configuration. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram showing an outline of a hydraulic oil tank 100 in which a filter device 1 is provided. [Figure 2] 1 is a perspective view showing an outline of a filter device 1. FIG. [Figure 3] 1A and 1B are diagrams showing an outline of a filter device 1, in which (A) is a front view and (B) is a cross-sectional view taken along the line AA of (A). [Figure 4] 1 is a partially enlarged view showing an outline of a filter device 1. FIG. [Figure 5] 1 is a partially enlarged view showing an outline of a filter device 1. FIG. [Figure 6] 1A and 1B are diagrams showing a state in which the filter element 10 has moved in the +z direction, where (A) is an overall view of the filter device 1, and (B) is an enlarged cross-sectional view of part C in (A). [Figure 7] 1A and 1B are diagrams showing an outline of the cover 40, in which (A) is a front view and (B) is a perspective view seen from diagonally below. [Figure 8] (A) is an enlarged view of part B in Figure 3(A), (B) is an exploded view of (A), (C) is a half-sectional view of part of (B), and (D) is a view of (C) from the bottom of the page. [Figure 9] FIG. 2 is a diagram schematically illustrating a state in which the filter element 10 is removed. [Figure 10] FIG. 1 is a diagram showing an outline of the invention described in Patent Document 1. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Hereinafter, a filter device of the present invention will be described using a return filter installed in a tank as an example. The liquid filtered by the filter device is, for example, hydraulic oil, but is not limited to hydraulic oil. In the drawings, hatching indicating a cross section is partially omitted.

[0016] Fig. 1 is a diagram showing an outline of a hydraulic oil tank 100 in which a filter device 1 according to one embodiment of the present invention is provided. In Fig. 1, the essential parts of the hydraulic oil tank 100 are shown in perspective.

[0017] The hydraulic oil tank 100 is installed in a work machine (not shown), such as a wheel loader, and is a tank for storing hydraulic oil provided in a hydraulic circuit for supplying hydraulic oil to a hydraulic device of the work machine. In the hydraulic circuit, hydraulic oil passes through the hydraulic device and is introduced into the hydraulic oil tank 100. The hydraulic oil tank 100 has, for example, a box-shaped tank body 101, and the tank body 101 is hollow inside. Inside the tank body 101, a filter device 1 and a suction strainer 102 are mainly provided.

[0018] An inlet pipe 103 is provided on the bottom surface 101a of the tank body 101, through which hydraulic oil flows into the inside of the tank body 101. A filter device 1 is provided on the inlet pipe 103. The hydraulic oil that flows in from the inlet pipe 103 is guided to the filter device 1. The hydraulic oil L is filtered by the filter device 1 and stored in the hydraulic oil tank 100.

[0019] In addition, a suction pipe 104 is provided on the bottom surface 101a to allow hydraulic oil in the tank body 101 to flow out to a hydraulic pump (not shown). The suction pipe 104 is connected to a suction port of the hydraulic pump (not shown).

[0020] A suction strainer 102 is provided in the suction pipe 104 to prevent foreign matter from entering the suction pipe 104. The hydraulic oil stored in the hydraulic oil tank 100 is sucked into a hydraulic pump (not shown), flows out into the suction pipe 104 through the suction strainer 102, and is then supplied to the hydraulic device again.

[0021] Hereinafter, the direction along the central axis ax of the filter device 1 is referred to as the z direction, and the directions perpendicular to the z direction are referred to as the x direction and the y direction. The x direction and the y direction are also perpendicular to each other.

[0022] The inlet pipe 103 and the suction pipe 104 do not necessarily have to be provided on the bottom surface 101 a. For example, the inlet pipe 103 and the suction pipe 104 may be provided at a position close to the bottom surface 101 a on the side surface of the tank body 101, and the inlet pipe 103 and the suction pipe 104 may be L-shaped so that the part of the inlet pipe 103 where the filter device 1 is provided and the part of the suction pipe 104 where the suction strainer 102 is provided are aligned along the z direction.

[0023] Furthermore, openings 101c and 101d are formed in the upper end surface 101b of the tank body 101 to be used for maintenance of the filter device 1 and the suction strainer 102. A cover 40 (described in detail later) of the filter device 1 is attached to the upper end surface 101b so as to cover the opening 101c, and a cover 102a of the suction strainer 102 is attached to the upper end surface 101b so as to cover the opening 101d.

[0024] Bolt insertion holes (not shown) are formed in the periphery of the covers 40 and 102a. The covers 40 and 102a are fastened to the tank body 101 by threading bolts (not shown) inserted into the bolt insertion holes into bolt holes (not shown) in the tank body 101.

[0025] Fig. 2 is a perspective view showing an outline of the filter device 1. Fig. 3 is a view showing an outline of the filter device 1, where (A) is a front view and (B) is a cross-sectional view taken along line AA of (A). For the sake of explanation, Figs. 2 and 3 also show the inlet pipe 103 in addition to the filter device 1.

[0026] The filter device 1 mainly includes a filter element 10, an end cap 20, a rod-shaped member 30, and a cover 40. The inlet pipe 103 is provided at the −z side end of the filter device 1, i.e., at the end cap 20.

[0027] The filter element 10 has a cylindrical shape overall and mainly comprises a filter medium 11, an upper plate 12 (corresponding to the plate of the present invention), and a lower plate 13. The filter medium 11 is cylindrical and is a member that filters hydraulic oil. The filter medium 11 is formed, for example, by folding a sheet-like thin plate with holes formed over almost the entire area into a pleated shape, connecting both ends of the folded thin plate, and rolling it into a cylindrical shape. The upper plate 12 is provided at the end of the filter medium 11 on the +z side, and the lower plate 13 is provided at the end of the filter medium 11 on the -z side. In other words, the upper plate 12 and the lower plate 13 sandwich the filter medium 11.

[0028] 4 is a partially enlarged view showing an outline of the filter device 1. The upper plate 12 has a plate-shaped portion 12a that abuts against the end of the filter medium 11 on the +z side, and a cylindrical portion 12b provided on the periphery of the plate-shaped portion 12a. The plate-shaped portion 12a is formed with a hole 12c into which a rod-shaped member 32 (described in detail later) of the rod-shaped member 30 is inserted. Note that the cylindrical portion 12b is not essential.

[0029] FIG. 5 is a partially enlarged view showing the outline of the filter device 1. For the sake of explanation, FIG. 5 also shows the inlet pipe 103 in addition to the filter device 1. The lower plate 13 has an annular plate-shaped portion 13a that abuts the -z-side end of the filter medium 11, a cylindrical portion 13b provided on the inner peripheral edge of the plate-shaped portion 13a, and a cylindrical portion 13c provided on the outer peripheral edge of the plate-shaped portion 13a. A hollow portion 13d, which is the region inside the plate-shaped portion 13a and the cylindrical portion 13b, is an opening, and a rod-shaped member 32 is inserted into the hollow portion 13d. The hollow portion 13d is a hole that connects the interior (space S2) of the inlet pipe 103 (corresponding to the inlet portion of the present invention) with the hollow portion (space S1) of the filter medium 11. The cylindrical portions 13b and 13c are not essential. The end of the -z side of the filter medium 11 may be fixed with adhesive or the like, in which case the lower plate 13 is not essential.

[0030] 2 and 3, the end cap 20 is provided on the lower side (-z side) of the filter element 10. In other words, the end cap 20 is provided adjacent to the end of the filter medium on the side where the upper plate 12 is not provided. The end cap 20 is also placed on the upper side of the inlet pipe 103.

[0031] 5, end cap 20 mainly includes an annular plate-like portion 20a against which plate-like portion 13a abuts, a cylindrical portion 20b (corresponding to the fitting portion of the present invention) into which inlet pipe 103 is inserted, a cylindrical portion 20c that fits along cylindrical portion 13c, and a protrusion 20d formed on cylindrical portion 13c. A groove 20f formed in cylindrical portion 20b is provided with an elastically deformable sealing member (not shown), and inlet pipe 103 is fixed to cylindrical portion 20b by the sealing member.

[0032] The hollow portion 20e of the plate-like portion 20a is provided with an attachment portion 21 to which a rod-shaped member 32 (corresponding to a second rod-shaped member of the present invention) of the rod-shaped member 30 is attached. The attachment portion 21 mainly has a fixing portion 21a to which the rod-shaped member 32 is attached, and a rod-shaped connecting portion 21b that connects the fixing portion 21a to the plate-like portion 20a. A hole 21c is formed in the fixing portion 21a, and with an end 32a of the rod-shaped member 32 inserted into the hole 21c, the hole 21c and the rod-shaped member 32 are fixed by adhesive or the like. A space 21d between adjacent connecting portions 21b is a hole that communicates with the space S1 and the space S2.

[0033] The hole connecting space S1 and space S2 is not limited to space 21d. For example, the connecting portion connecting fixed portion 21a and plate-like portion 20a may be plate-shaped, and one or more holes provided in this connecting portion may connect space S1 and space S2.

[0034] Returning to the explanation of Figures 2 and 3, rod-shaped member 30 mainly has rod-shaped member 31 (corresponding to the first rod-shaped member of the present invention), rod-shaped member 32, and connecting member 33. Connecting member 33 has two connecting members 33a and 33b. The two connecting members 33a and 33b are integrated.

[0035] One end of the rod-shaped member 31 is connected to the cover 40, and the other end is connected to the connecting member 33a. One end of the rod-shaped member 32 is connected to the end cap 20, and the other end is connected to the connecting member 33b. The connecting member 33 connects the rod-shaped member 31 and the rod-shaped member 32.

[0036] In the present embodiment, the two connecting members 33a and 33b constitute the connecting member 33, but the form of the connecting member 33 is not limited to this. For example, the connecting member 33 may be composed of a single member.

[0037] The rod-shaped member 30 is disposed in a position extending upward from the end cap 20. The rod-shaped member 32 (as well as the rod-shaped member 30) is longer than the length of the filter element 10 and is provided so as to penetrate the filter element 10 along the central axis ax of the filter element 10 (which coincides with the central axis ax of the filter device 1).

[0038] 4, a hole 33c is provided in the connecting member 33a, and the end 31a of the rod-shaped member 31 is inserted into the hole 33c and fixed by adhesive or the like. A screw hole (female thread) 33d is provided in the connecting member 33b, and a male thread portion (not shown) formed on the end 32b of the rod-shaped member 32 is screwed into the screw hole 33d.

[0039] A flange portion 52 is provided on the -z side (filter element 10 side) of the connecting member 33. A hole 52a into which the rod-shaped member 32 is inserted is formed in the flange portion 52. A recess 52b is also formed in the flange portion 52, and the recess 52b faces the upper plate 12. An elastic member 51 (here, a coil spring) is provided between the recess 52b and the upper plate 12.

[0040] The elastic member 51 applies a force in the −z direction to the filter element 10, pressing the filter element 10 against the end cap 20. When the pressure in the internal space (space S1) of the filter element 10 exceeds a predetermined value, the filter element 10 moves in the +z direction against the biasing force of the elastic member 51.

[0041] 6A and 6B are diagrams showing the filter element 10 moving in the +z direction, with (A) being an overall view of the filter device 1 (and inlet pipe 103) and (B) being an enlarged cross-sectional view of part C in (A). When the pressure in space S1 exceeds a predetermined value, the filter element 10 moves in the +z direction, creating a gap between the lower plate 13 and the end cap 20. As a result, hydraulic oil flows out from this gap, preventing damage to the filter element 10 and other components. In this way, the function of a relief valve can be achieved with a simple configuration.

[0042] When filter element 10 moves in the +z direction, cylindrical portion 13b is positioned by protrusion 20d. Therefore, when the pressure in space S1 decreases and filter element 10 moves in the -z direction, lower plate 13 is again inserted inside cylindrical portion 20c.

[0043] FIG. 7 is a diagram showing an outline of the cover 40, where (A) is a front view and (B) is a perspective view seen from diagonally below. The cover 40 mainly comprises a plate-shaped member 41, a protrusion 42 provided on the plate-shaped member 41, and a reinforcing portion 43 provided around the protrusion 42. The protrusion 42 is provided on the -z side (the filter element 10 side) of the plate-shaped member 41. The protrusion 42 has a hole 42a into which the rod-shaped member 31 is inserted. The rod-shaped member 31 is fixed to the hole 42a by adhesive or the like while inserted into the hole 42a. The reinforcing portion 43 is a rib provided radially from the protrusion 42 and reinforces the protrusion 42. Note that the position, size, shape, number, etc. of the reinforcing portion 43 are not limited to those shown in the figure.

[0044] Fig. 8(A) is an enlarged view of part B in Fig. 3(A), Fig. 8(B) is an exploded view of Fig. 8(A), Fig. 8(C) is a half-sectional view of a part of Fig. 8(B), and Fig. 8(D) is a view of Fig. 8(C) viewed from the bottom of the paper.

[0045] When the threaded hole 33d of the connecting member 33b is unscrewed from the male thread portion 32c of the rod-shaped member 32, the rod-shaped member 32 and the connecting member 33 are disassembled. This allows the flange portion 52 and the elastic member 51 to be removed from the rod-shaped member 32 by moving the flange portion 52 and the elastic member 51 in the +z direction. By removing the flange portion 52 and the elastic member 51 from the rod-shaped member 32, the filter element 10 can be removed and replaced.

[0046] 9 is a diagram schematically illustrating a state in which the filter element 10 has been removed. With the flange portion 52 and the elastic member 51 removed from the rod-shaped member 32, the filter element 10 is pulled out in the +z direction, thereby removing the filter element 10 from the assembly of the end cap 20 and the rod-shaped member 32.

[0047] Next, the function of the filter device 1 will be explained using Figures 1 and 3. The two-dot chain lines in Figures 1 and 3 indicate the flow of hydraulic oil L. The filter device 1 is inserted into the tank body 101 through the opening 101c, the inlet pipe 103 and the end cap 20 are inserted into the cylindrical portion 20b, and the cover 40 is fixed to the upper end surface 101b. This sets the filter device 1 in the tank body 101, allowing the filter device 1 to perform its functions.

[0048] The hydraulic oil flows from space S2 of the inlet pipe 103 into space S1 of the filter element 10, is filtered as it flows from the inside to the outside of the filter medium 11, and flows into the internal space (space S3) of the tank body 101. The filtered hydraulic oil that has flowed into space S3 flows out of the suction pipe 104 via the suction strainer 102.

[0049] After filtering for a certain period of time, the filter medium 11 becomes clogged, and the filter medium 11, i.e., the filter element 10, must be replaced. To replace the filter medium 11, first remove the cover 40 from the tank body 101, then pull the entire filter device 1 out through the opening 101c, and remove the cover 40 from the tank body 101. Then, the rod-shaped member 32 and the connecting member 33 are disassembled, the flange portion 52 and the elastic member 51 are removed from the rod-shaped member 32, and the filter element 10 is pulled out in the +z direction. This removes the used filter element 10.

[0050] To replace the filter element 10, after removing the used filter element 10, a new filter element 10 is placed on the end cap 20 and the rod-shaped member 32 is inserted into the hole 12c. Then, the elastic member 51 and the flange portion 52 are inserted into the rod-shaped member 32, and the rod-shaped member 32 and the connecting member 33 are assembled together. In this way, the filter device 1 is reassembled.

[0051] According to this embodiment, the filter device 1 can be configured simply by fixing the filter element 10 with the rod-shaped member 30.

[0052] For example, if hydraulic oil is introduced from above or beside the filter device (return filter), the return filter can be provided on the top surface of the tank body 101, so the filter device does not become larger. However, depending on the internal configuration of the work machine, hydraulic oil may need to be introduced from below the filter device, which increases the device size. Also, if a filter housing is provided around the filter element 10, the number of parts increases and the device becomes larger.

[0053] In contrast, in this embodiment, the configuration is the bare minimum required, so even when hydraulic oil is introduced from below the filter device, the configuration of the filter device 1 is simple. In addition, the number of parts is small, so the device can be made smaller.

[0054] Furthermore, according to this embodiment, since the cover 40 is provided with the reinforcing portion 43, even if an external force is applied to the filter element 10 or the like and a large force is applied to the protrusion 42 via the rod-shaped member 31, the load is dispersed by the reinforcing portion 43. This allows for load dispersion without providing a filter housing or the like. Therefore, a sturdy filter device 1 can be achieved despite its simple configuration.

[0055] Furthermore, according to this embodiment, the rod-shaped members 31 and 32 can be disassembled using the connecting member 33, which shortens the distance required to pull out the filter element 10 when replacing it, making it easier to replace the filter element 10 and maintain the filter device 1.

[0056] For example, if the length of the rod-shaped member 30 is approximately 800 mm, if the rod-shaped member cannot be disassembled, the filter element 10 would have to be moved in the +z direction by more than 800 mm, making it difficult to replace the filter element 10. However, by making the rod-shaped member 30 disassemblable, it becomes easier to replace the filter element 10.

[0057] In this embodiment, a dismountable rod-shaped member 30 is used, but for example, if the height (length in the z direction) of the filter device 1 is short, the rod-shaped member 30 does not have to be dismountable. In this case, both ends of a single rod-shaped member may be attached to the cover 40 and the end cap 20, respectively, and a detachable flange portion 52 may be provided midway along the single rod-shaped member.

[0058] In addition, in the present embodiment, the inlet pipe 103 is inserted into the cylindrical portion 20b of the end cap 20, but the manner in which the inlet pipe 103 is provided in the cylindrical portion 20b is not limited to this. For example, the cylindrical portion of the end cap 20 may be inserted into the inlet pipe 103. The form of the cylindrical portion 20b is also not limited to this. In short, it is sufficient that the end cap 20 and the inlet pipe 103 are fitted together.

[0059] Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and design modifications within the scope of the gist of the present invention are also included. For example, the above examples have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add, delete, or replace other configurations to the configuration of one embodiment.

[0060] In the present invention, the term "substantially" does not only mean strictly identical, but also includes errors or deformations to the extent that identity is not lost. For example, "substantially perpendicular" is not limited to strictly perpendicular, but includes an error of, for example, several degrees. Furthermore, for example, when expressing orthogonal, parallel, coincident, etc., it includes not only strictly perpendicular, parallel, coincident, etc., but also substantially parallel, substantially perpendicular, substantially coincident, etc.

[0061] In addition, in the present invention, "vicinity" means including a certain range (which can be determined arbitrarily) near a reference position. For example, "near an end" is a concept indicating a certain range near the end, which may or may not include the end. [Explanation of symbols]

[0062] 1: Filter device 10: Filter element 11: Filter medium 12: Upper plate 12a: Plate-shaped part 12b: Cylindrical part 12c: hole 13: Lower plate 13a: Plate-shaped part 13b, 13c: cylindrical portion 13d: Hollow part 20: End cap 20a: Plate-shaped part 20b, 20c: Cylindrical part 20d: Protrusion 20e: Hollow part 20f: Groove 21: Mounting part 21a: Fixed part 21b:Connection part 21c:hole 21d: Space 30, 31, 32: Rod-shaped members 31a, 32a, 32b: Edge 32c: Male thread 33, 33a, 33b: connecting members 33c:hole 33d: screw hole 40: Cover 41: Plate-shaped member 42:Protrusion 42a: Hole 43: Reinforcement 51: Elastic member 52: Flange part 52a: hole 52b: recess 100: Hydraulic oil tank 101: Tank body 101a: Bottom 101b: Upper end surface 101c, 101d: Opening 102: Suction strainer 102a: Cover 103:Inflow pipe 104: Suction pipe

Claims

1. A rod-shaped member; an end cap provided at one end of the rod-shaped member; a filter element provided in the end cap and having a cylindrical filter medium; a cover provided at the other end of the rod-shaped member for attaching the end cap to a tank; Equipped with The rod-shaped member is longer than the length of the filter element and is provided so as to penetrate the filter element along the central axis of the filter element. A filter device characterized by:

2. A filter device provided in a tank in which oil is stored, a filter element having a cylindrical filter material; an end cap provided on the filter element; a rod-shaped member having one end connected to the end cap; a cover connected to the other end of the rod-shaped member and provided on the tank so as to cover an opening provided in the tank; Equipped with the rod-shaped member, the filter element, and the end cap are disposed within the tank; the rod-shaped member is longer than the length of the filter element and is provided so as to penetrate the filter element along the central axis of the filter element, the end cap has a fitting portion into which the inlet portion of the tank is fitted, The end cap is provided with a hole that connects the inlet portion with the hollow portion of the filter medium. A filter device characterized by:

3. The cover includes a plate-like member, a protrusion provided on the plate-like member, the protrusion having a hole formed therein into which the rod-like member is inserted, and a reinforcing portion provided around the protrusion for reinforcing the protrusion.

3. The filter device according to claim 1 or 2.

4. the rod-shaped member includes a first rod-shaped member provided on the cover, a second rod-shaped member provided on the end cap, and a connecting member connecting the first rod-shaped member and the second rod-shaped member, The connecting member is provided between the filter element and the cover.

4. A filter device according to claim 1, wherein the filter device is a filter element.

5. The rod-shaped member is provided with a flange portion, The flange portion is provided between the cover and a plate provided at an end of the filter medium not adjacent to the end cap, an elastic member is provided between the flange portion and the plate, The filter element is movable in a first direction parallel to the central axis.

5. A filter device according to claim 1, wherein the filter device is a filter element.

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