Filter Device

Abstract

To facilitate positioning of a component.SOLUTION: A filter device comprises: a bottomed cylindrical case; a head that covers an opening part of the case and has a flow passage hole serving as a flow passage of liquid; a connecting member which is provided at the head and makes the liquid flow into a space formed of the case and the head through the flow passage hole; and a fastening member for fixing the connecting member to the head. The fastening member has a head part, a circular column part thinner than the head part, and a first male screw part provided on an external peripheral face of the circular column part. The head has a first female screw part which is screwed with the first male screw part. The connecting member has a cylindrical part which abuts on the head on one end face and abuts on the head part on the other end face, the circular column part being inserted into a cylindrical hollow part. A circular ring-shaped first seal member is arranged between the cylinder part and the head, and a circular ring-shaped second seal member is arranged between the cylindrical part and the circular column part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a fuel filter device for an engine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 58-25662 Summary of the Invention [Problem to be solved by the invention]

[0004] 9, the fuel filter device described in Patent Document 1 has a connector 140 that communicates with a fuel tank and is attached to an upper lid by a bolt 151. The connector 140 has a cylindrical portion 141 into which the bolt 151 is inserted and a tubular portion 142 into which a hose is inserted that protrudes from the cylindrical portion 141.

[0005] In the fuel filter device described in Patent Document 1, when the bolt 151 is screwed into the top cover 120, the connector 140 may rotate together with the bolt 151. As a result, the position of the tubular portion 142 may change as the connector 140 rotates, and it may become impossible to position the tubular portion 142.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a filter device in which the positioning of components can be easily performed. [Means for solving the problem]

[0007] In order to solve the above problems, the filter device of the present invention comprises, for example, a cylindrical case with a bottom, a head that covers the opening of the case and has a flow path hole that serves as a liquid flow path, a connecting member provided on the head, and a fastening member that fixes the connecting member to the head, wherein the fastening member has a head, a cylindrical portion that is thinner than the head, and a first male thread portion provided on the outer surface of the cylindrical portion, the head has a first female thread portion that screws into the first male thread portion, the connecting member has a cylindrical portion with one end face abutting the head and the other end face abutting the head, the cylindrical portion is inserted into the hollow portion of the cylindrical portion, a first annular sealing member is provided between the cylindrical portion and the head, and a second annular sealing member is provided between the cylindrical portion and the cylindrical portion.

[0008] In the filter device according to the present invention, the cylindrical portion of the fastening member is inserted into the hollow portion of the tubular portion of the connecting member, the first male threaded portion of the fastening member is threadedly engaged with the first male threaded portion of the head, one end face of the tubular portion abuts against the head, and the other end face abuts against the head portion. A first annular seal member is provided between the tubular portion and the head, and a second annular seal member is provided between the tubular portion and the cylindrical portion. As a result, the tightening torque required to attach the fastening member to the head is reduced, and the connecting member is less likely to rotate even when the fastening member is rotated. This facilitates positioning of the connecting member (particularly, positioning in the rotational direction).

[0009] The cylindrical portion may have a first hole formed therein and communicating with the flow path hole, and a groove formed in at least one of the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the cylindrical portion at an overlapping portion between the cylindrical portion and the cylindrical portion and communicating with the first hole, and the second seal member may be provided between the groove and the head portion, thereby preventing the liquid flowing inside the groove from leaking from between the cylindrical portion and the head portion.

[0010] The cylindrical portion may be provided with a first coupling portion, the head may be provided with a second coupling portion having a shape corresponding to the first coupling portion, and the first coupling portion and the second coupling portion may be coupled together, thereby facilitating positioning of the cylindrical portion in the rotational direction.

[0011] The first coupling portion may be at least one first recess provided on the outer peripheral surface of the cylindrical portion, and the second coupling portion may be a first protrusion provided on the head, and the first coupling portion and the second coupling portion may be coupled together by inserting the first protrusion into the first recess. This allows the recess to also function as a lightening portion, preventing a decrease in dimensional accuracy of the inner peripheral surface of the cylindrical portion and preventing fuel leakage, etc.

[0012] The head may be provided with a second hole into which the cylindrical portion is inserted, the first coupling portion may be a first flat surface provided on the outer peripheral surface of the cylindrical portion, the second coupling portion may be a second flat surface that abuts against the first flat surface, and the second hole may have the second flat surface. This allows the cylindrical portion to be positioned in the rotational direction with a simple configuration.

[0013] The fuel supply system may further include a rotating member rotatably mounted on the head, the head including a cylindrical third hole, a cylindrical protrusion formed on a bottom surface of the third hole and having a diameter smaller than an inner diameter of the third hole, and a connecting hole connecting the third hole and the flow path hole, the connecting hole being formed inside the protrusion and having one end opening at a tip surface of the protrusion, the rotating member being inserted into the third hole and having a cylindrical insertion portion having an outer diameter substantially the same as the inner diameter of the third hole, a recess formed on a bottom surface of the insertion portion, the insertion portion being rotatable between a state in which the bottom surface of the insertion portion abuts against the tip of the protrusion and a state in which the recess and the protrusion overlap, and a ring-shaped third seal member being provided on an outer peripheral surface of the protrusion, the height of the third seal member being equal to or greater than the height of the protrusion. This allows the rotating member to be rotated with a weak force when rotating to switch between allowing and not allowing fuel to flow in.

[0014] The case may include a cylindrical nut that abuts against the outer peripheral surface of the case, the inner peripheral surface of the nut having a second female thread, the head having a second male thread that screws into the second female thread, the case having a second protrusion near an open end, and the head having a second recess into which the second protrusion is inserted. This makes it easy to position the case in the rotational direction. [Effects of the Invention]

[0015] According to the present invention, the positioning of the component can be easily performed. [Brief explanation of the drawings]

[0016] [Figure 1] 1A and 1B are diagrams showing a schematic overview of a filter device 1, in which (A) is a plan view and (B) is a side view. [Figure 2] 1 is a cross-sectional view showing an outline of a filter device 1. FIG. [Figure 3] 10 is a cross-sectional view showing an outline of a structure in which a fastening member 51 attaches a connecting member 40 to a head 20. FIG. [Figure 4] 10A and 10B are perspective views showing an outline of a state in which a fastening member 51 and a connecting member 40 are provided on a head 20, where (A) is a view seen obliquely from the front, and (B) is a view seen obliquely from below. [Figure 5] FIG. 2 is a diagram showing an outline of a rotary member 60. [Figure 6] FIG. 10 is a schematic cross-sectional view showing a state in which a rotation member 60 is provided in a hole 20b. [Figure 7] FIG. 10 is a schematic cross-sectional view showing a state in which a rotation member 60 is provided in a hole 20b. [Figure 8] 1A and 1B are diagrams showing an outline of a structure for positioning the case 10 and the head 20, in which (A) is a perspective view of the head 20 and (B) is a perspective view of the case 10. FIG. [Figure 9] 1 is a diagram showing an outline of a filter device 100 according to the prior art. [Figure 10] FIG. 2 is a cross-sectional view showing an outline of a filter device 2. [Figure 11]10A is a perspective view showing an outline of the state in which the fastening member 51 and the connecting member 40A are provided on the head 20A, FIG. 10B is a perspective view of the main part of the head 20A, and FIG. 10C is a perspective view of the connecting member 40A. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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 fuel filter as an example, in which fuel used in an internal combustion engine is used as a liquid. However, the present invention can be applied to various types of filter devices other than fuel filters, and various liquids other than fuel can be used.

[0018] First Embodiment 1A and 1B are diagrams schematically illustrating an outline of a filter device 1, where (A) is a plan view and (B) is a side view. Hereinafter, the direction along the center line ax is defined as the z direction, and the directions perpendicular to the z direction are defined as the x direction and the y direction.

[0019] The filter device 1 mainly includes a case 10, a head 20, a nut 30, a connecting member 40, fastening members 51 and 52, a rotating member 60, and a filter element 70 (see FIG. 2).

[0020] The case 10 is cylindrical with a bottom and has an open end 11c (see FIG. 2) on the +z side. The head 20 covers the open end 11c of the case 10. A cylindrical nut 30 abuts against the outer peripheral surface of the case 10, and the cylindrical nut 30 is attached to the head 20, thereby fixing the case 10 to the head 20. The case 10, head 20, and nut 30 are made of a highly corrosion-resistant material (for example, stainless steel, iron with a surface treatment such as plating, aluminum alloy, or synthetic resin).

[0021] The head 20 is provided with connecting members 40 and 45, fastening members 51 and 52, and a rotating member 60. The fastening member 51 secures the connecting member 40 to the head 20, and the fastening member 52 secures the connecting member 45 to the head 20. The connecting members 40 and 45 have the same shape and structure, and the fastening members 51 and 52 have the same shape and structure. The connecting member 40, the fastening members 51 and 52, and the rotating member 60 are formed using a highly corrosion-resistant material (for example, stainless steel).

[0022] Fig. 2 is a cross-sectional view taken along line AA in Fig. 1(A), and is a cross-sectional view showing an outline of the filter device 1. Note that hatching indicating cross sections of some components is omitted in Fig. 2. In Fig. 2, the flow of fuel is indicated by a chain double-dashed arrow.

[0023] The case 10 has a cylindrical case body 11 with a bottom, and a drain 12 provided on a bottom surface 11a of the case body 11. A head 20 is provided to cover an open end 11c of the case body 11.

[0024] The nut 30 has a protrusion 30a and a female thread portion 30b. The protrusion 30a abuts against a convex portion 11b provided on the outer peripheral surface of the case body 11. The female thread portion 30b is provided on the inner peripheral surface of the nut 30. The case 10 is attached to the head 20 by threading the female thread portion 30b into a male thread portion 20i provided on the outer peripheral surface of the cylindrical portion 20h of the head 20.

[0025] A filter element 70 is provided in the space formed by the case 10 and the head 20. The filter element 70 mainly includes a filter medium 71, an inner cylinder 72, and plates 73 and 74. The filter medium 71 is a cylindrical member formed by pleating a sheet of filter paper made of synthetic resin, paper, or the like and connecting both ends of the pleated filter paper to form a member with openings at both ends. The inner cylinder 72 is formed of a highly corrosion-resistant material (e.g., stainless steel) and is provided inside the filter medium 71. A plurality of holes 72a are formed throughout substantially the entire area of ​​the inner cylinder 72, connecting the outside and inside of the inner cylinder 72.

[0026] Plate 73 is provided at one end of filter medium 71 and inner cylinder 72, and plate 74 is provided at the other end. Plates 73 and 74 are generally cylindrical members with bottoms, and are integrated with filter medium 71 and inner cylinder 72 by adhesive.

[0027] The filter element 70 is attached to the head 20 by inserting the cylindrical portion 20j into the plate 74. A seal member 85 is provided between the cylindrical portion 20j and the plate 74. The seal member 85 is made of a soft elastic material (e.g., rubber) and is a member, such as an O-ring, that prevents fluid leakage.

[0028] The head 20 is provided with an inlet 20a which serves as a flow path for the liquid. The head 20 is also provided with a hole 20b (corresponding to the third hole of the present invention) in which a rotating member 60 is provided. The inlet 20a and the hole 20b are communicated with each other via a connecting hole 20e. The hole 20b, the connecting hole 20e, and the rotating member 60 will be described in detail later.

[0029] The head 20 is also provided with a connecting member 40 and a fastening member 51, and a connecting member 45 and a fastening member 52. The head 20 has a flow path hole (first flow path hole) connected to the connecting member 40 and a flow path hole (second flow path hole) connected to the connecting member 45. The first flow path hole and the second flow path hole are holes that serve as flow paths for liquid provided inside the head 20, the first flow path hole including an inlet portion 20a, a hole 20b, a connecting hole 20e, and a hole 20o (see FIG. 8), and the second flow path hole includes a hollow portion of the tubular portion 20j and an outlet portion 20q.

[0030] The connecting member 40 allows fuel to flow into the space S in which the filter element 70 is provided via the first flow path hole. The fuel that has flowed into the space S is filtered by the filter material 71 and flows out into the hollow portion of the inner cylinder 72. The connecting member 45 allows the fuel filtered by the filter element 70 to flow out of the filter device 1 via the second flow path hole and the outlet portion 52a provided in the fastening member 52.

[0031] 3 is a cross-sectional view showing an outline of the structure in which fastening member 51 attaches connecting member 40 to head 20. Note that the structure in which fastening member 52 attaches connecting member 45 to head 20 is the same as the structure in which fastening member 51 attaches connecting member 40 to head 20, and therefore a description thereof will be omitted.

[0032] The connecting member 40 has a cylindrical portion 41 and a hose plug 42 attached to the cylindrical portion 41. The hose plug 42 is a component to which a hose attached to a fuel tank (not shown) is attached, and protrudes radially outward from the cylindrical portion 41. The hollow portion of the cylindrical portion 41 and the hollow portion of the hose plug 42 are in communication. Therefore, fuel stored in the fuel tank is supplied from the tank to the connecting member 40.

[0033] The fastening member 51 has a head 51a, a cylindrical portion 51b that is thinner than the head 51a, and a male thread portion 51c provided on the outer circumferential surface of the cylindrical portion 51b. The head 20 has a female thread portion 20c, and the male thread portion 51c screws into the female thread portion 20c.

[0034] When the fastening member 51 is attached to the head 20 by threading the male thread portion 51c into the female thread portion 20c, one end face 41a of the cylindrical portion 41 abuts against the head 20, and the other end face 41b abuts against the head 51a. In this way, the connecting member 40 is attached to the head 20. At this time, the columnar portion 51b is inserted into the hollow portion of the cylindrical portion 41.

[0035] A ring-shaped seal member 81 is provided between the cylindrical portion 41 and the head 20. Furthermore, a ring-shaped seal member 82 is provided between the cylindrical portion 41 and the columnar portion 51b. The seal members 81 and 82 are formed using an elastic soft material (e.g., rubber) and are members that prevent fluid leakage, such as O-rings. The seal members 81 and 82 fix the cylindrical portion 41, i.e., the connecting member 40, to the head 20 and the fastening member 51.

[0036] Since the sealing members 81 and 82 are O-rings, even if the sealing members 81 and 82 are provided, the tightening torque when attaching the fastening member 51 to the head 20 does not become large.

[0037] An end surface 41a of the cylindrical portion 41 facing the head 20 is provided with a recess 41c in which a seal member 81 is provided. By providing the seal member 81 between the cylindrical portion 41 and the head 20, it is possible to prevent the fuel flowing through the connecting member 40 from leaking from between the cylindrical portion 41 and the head 20.

[0038] A hole 51e (corresponding to a first hole according to the present invention) communicating with inflow portion 20a is provided inside cylindrical portion 51b. Hole 51e communicates with groove 51d, so that groove 51d and inflow portion 20a communicate with each other, and fuel that has flowed into connecting member 40 flows into inflow portion 20a.

[0039] Groove 51d is provided on the outer peripheral surface of cylindrical portion 51b at the portion where cylindrical portion 41 and columnar portion 51b overlap. Note that, in the present embodiment, groove 51d is provided on the outer peripheral surface of columnar portion 51b, but the position of the groove is not limited thereto, and it is sufficient that the groove is provided on at least one of the inner peripheral surface of cylindrical portion 41 and the outer peripheral surface of columnar portion 51b.

[0040] The cylindrical portion 51b is provided with a recess 51f in which a seal member 82 is provided. The seal member 82 and the cylindrical portion 51b are provided between the groove 51d and the head 51a. Therefore, the fuel flowing through the groove 51d can be prevented from leaking from between the cylindrical portion 41 and the head 51a.

[0041] In this embodiment, the seal members 81 and 82 are O-rings, and are provided in the recesses 41c and 51f, respectively, but the seal members 81 and 82 are not limited to O-rings. For example, the seal members 81 and 82 may be flat packings having an annular shape. Furthermore, when the seal members 81 and 82 are flat packings, the recesses 41c and 51f are not essential.

[0042] 4A and 4B are perspective views showing an outline of the state in which the fastening member 51 and the connecting member 40 are provided on the head 20, where (A) is a view seen from diagonally front, and (B) is a view seen from diagonally below.

[0043] Recesses 41d are provided on the outer peripheral surface of the cylindrical portion 41. The recesses 41d are aligned along the axis of the cylindrical portion 41. There is at least one recess 41d, and preferably a plurality of recesses 41d are provided. In this embodiment, the recesses 41d are provided at 30-degree intervals.

[0044] A protrusion 20d is provided on the head 20. By inserting the protrusion 20d into the recess 41d, the protrusion 20d and the recess 41d are coupled together. As a result, when the fastening member 51 is rotated to screw the male threaded portion 51c into the female threaded portion 20c, the tubular portion 41 can be prevented from rotating due to the fastening member 51.

[0045] Because the cylindrical portion 41 is thick, it is desirable to provide a recess in order to maintain dimensional accuracy, etc. In this embodiment, by providing the recess 41d on the outer peripheral surface of the cylindrical portion 41, the recess 41d also serves as a recess, preventing a decrease in the dimensional accuracy of the inner peripheral surface of the cylindrical portion 41 and preventing fuel leakage, etc.

[0046] The recess 41d has a semicircular cross-sectional shape, is wide at the entrance, and tapers so that the inner diameter becomes smaller as it moves away from the entrance. The protrusion 20d has a shape corresponding to the recess 41d. That is, the protrusion 20d has a semicylindrical rod-like portion that is wide at the base and tapers so that it becomes thinner as it moves toward the tip.

[0047] In the present embodiment, the protrusion 20d has a cylindrical base and a semi-cylindrical other portion, but the shape of the protrusion 20d is not limited to this. For example, the entire protrusion 20d may be cylindrical.

[0048] In this embodiment, the cylindrical portion 41 is provided with a recess 41d, and the head 20 is provided with a protrusion as the protrusion 20d, but the cylindrical portion 41 may be provided with a protrusion, and the head 20 may be provided with a recess. It is sufficient that the cylindrical portion 41 is provided with a first coupling portion that is a protrusion or recess, and the head 20 is provided with a second coupling portion that has a shape corresponding to the first coupling portion, so that the first coupling portion and the second coupling portion can be coupled to each other.

[0049] Next, the hole 20b, the connecting hole 20e, and the rotating member 60 will be described in detail. FIG. 5 is a diagram showing an outline of the rotating member 60. The rotating member 60 has a cylindrical insertion portion 61 that is inserted into the hole 20b, and a lever 62 that is provided on the insertion portion 61. The lever 62 is provided on the +z side (upper side) of the insertion portion 61 and protrudes radially outward. As a result, an operator can grip the lever 62 and turn the rotating member 60. A recess 61b is provided on a bottom surface 61a of the rotating member 60.

[0050] 6 and 7 are schematic cross-sectional views showing a state in which a rotation member 60 is provided in the hole 20b. Fig. 6 shows a state in which the connecting hole 20e is not covered by the bottom surface 61a, and Fig. 7 shows a state in which the connecting hole 20e is covered by the bottom surface 61a.

[0051] Head 20 has cylindrical hole 20b, protrusion 20f, and connecting hole 20e. Hole 20b has hole 20m and hole 20n provided in bottom surface 20k of hole 20m. Rotating member 60 is inserted into hole 20m, and bottom surface 61a abuts against bottom surface 20k.

[0052] The protrusion 20f is provided on the bottom surface 20l of the hole 20n and protrudes from the bottom surface 20l toward the inside of the hole 20b in the z direction. The height of the protrusion 20f is equal to or less than the depth of the bottom surface 20l, but it is desirable that the height be approximately the same as the depth of the bottom surface 20l.

[0053] The connecting hole 20e connects the hole 20b and the inlet 20a. The connecting hole 20e is provided inside the protruding portion 20f along the z direction, and one end thereof opens to the tip surface of the protruding portion 20f.

[0054] The insertion portion 61 is rotatably inserted into the hole 20b, and its outer diameter is approximately the same as the inner diameter of the hole 20b. A seal member 83 is provided on the outer peripheral surface of the insertion portion 61 to prevent fuel from leaking between the hole 20b and the insertion portion 61. The seal member 83 is made of a soft elastic material (e.g., rubber) and is a member, such as an O-ring, that prevents fluid leakage.

[0055] In this embodiment, the sealing member 83 is an O-ring and is provided in the recess 61c, but the sealing member 83 is not limited to an O-ring. For example, the sealing member 83 may be a flat packing having a circular ring shape. Furthermore, when the sealing member 83 is a flat packing, the recess 61c is not essential.

[0056] An annular seal member 84 is provided on the outer peripheral surface of the protrusion 20f. The seal member 84 is made of a soft elastic material (e.g., rubber) and is a member that prevents fluid leakage, such as an O-ring. The height of the seal member 84 is equal to or greater than the height of the protrusion 20f, and the seal member 84 abuts against the bottom surface 61a. It is desirable that the height of the seal member 84 and the height of the protrusion 20f are approximately the same.

[0057] Lever 62 is used to rotate insertion portion 61 inside hole 20b between a state in which recess 61b and protrusion 20f overlap, leaving connecting hole 20e uncovered (see FIG. 6), and a state in which bottom surface 61a abuts against the tip of protrusion 20f, leaving connecting hole 20e covered (see FIG. 7). When recess 61b and protrusion 20f overlap, leaving connecting hole 20e uncovered (see FIG. 6), fuel that has flowed into inlet 20a flows into space S via connecting hole 20e, recess 61b, hole 20b, and hole 20o (see FIG. 8). In contrast, when connecting hole 20e is covered by bottom surface 61a (see FIG. 7), fuel that has flowed into inlet 20a does not flow into space S. In this way, simply by rotating rotating member 60, it is possible to switch between allowing and not allowing fuel to flow into space S.

[0058] Because the bottom surface 61a and the seal member 84 only come into contact with each other, there is little resistance when rotating the insertion portion 61. In particular, by using an O-ring as the seal member 84, there is little resistance when rotating because the bottom surface 61a and the seal member 84 come into contact with each other in a line. Therefore, the rotation member 60 can be rotated with a weak force.

[0059] 8A and 8B are diagrams showing an outline of the structure for positioning the case 10 and the head 20, with (A) being a perspective view of the head 20 and (B) being a perspective view of the case 10. A protrusion 11d is provided at the open end 11c of the case body 11, protruding in the opposite direction (+z direction) from the bottom surface 11a along the center line ax. The head 20 is also provided with a recess 20p into which the protrusion 11d is inserted.

[0060] When the nut 30 is rotated with the protrusion 11b in contact with the nut 30 to screw the male threaded portion 20i into the female threaded portion 30b and attach the case 10 to the head 20, the protrusion 11d is inserted into the recess 20p, so that the case 10 does not rotate together with the nut 30, and the case 10 and the head 20 are positioned in the circumferential direction. This makes it easy to position the drain 12.

[0061] In this embodiment, four protrusions 11d and four recesses 20p are provided at 90-degree intervals, but the positions and numbers of the protrusions 11d and the recesses 20p are not limited to this, and the shapes of the protrusions 11d and the recesses 20p are not limited to this either.

[0062] Furthermore, the protrusion 11d does not need to be provided at the opening end 11c, but may be provided near the opening end 11c. For example, the protrusion may be provided on the outer peripheral surface of the case body 11 near the opening end 11c so as to protrude radially outward.

[0063] According to this embodiment, the cylindrical portion 51b of the fastening member 51 that secures the connecting member 40 to the head 20 is inserted into the hollow portion of the cylindrical portion of the connecting member 40 that allows fuel to flow into the space S, and the seal member 81 is provided between the cylindrical portion 41 and the head 20, and the seal member 82 is provided between the cylindrical portion 41 and the cylindrical portion 51b, so that the tightening torque when attaching the fastening member 51 to the head 20 is not large. Therefore, the hose plug 42 can be easily positioned by rotating the fastening member 51 while gripping it.

[0064] For example, in a filter device 100 according to the prior art shown in FIG. 9 , a top cover 120 is attached to a case 110. A connector 140 is attached to the top cover 120 via a bolt 151, and plain washers 145 are attached to both sides of the connector 140. In the filter device 100, plain washers 145 are used instead of the seal members 81 and 82 of the present embodiment to secure the connector 140 to the top cover 120 and the bolt 151. However, a large tightening torque (approximately 40 N) is required to rotate the bolt 151 and deform the plain washer 145, making it difficult to rotate the bolt 151 while gripping the tubular portion 142, i.e., to position the tubular portion 142. In contrast, in the present embodiment, the use of seal members 81 and 82 allows the tightening torque to be reduced (approximately 20 N), making it easier to rotate the fastening member 51 while gripping the hose plug 42, i.e., to position the hose plug 42.

[0065] Furthermore, according to this embodiment, a seal member 82 is provided between the groove 51d and the head 51a, so that the fuel flowing inside the groove 51d can be prevented from leaking from between the cylindrical portion 41 and the head 51a.

[0066] Furthermore, according to this embodiment, the projection 20d is inserted into the recess 41d provided on the outer circumferential surface of the cylindrical portion 41, so that the connecting member 40 does not rotate when the fastening member 51 is rotated to attach it to the head 20. This facilitates positioning of the hose plug 42. In particular, the use of the seal members 81 and 82 reduces the tightening torque of the fastening member 51, allowing the projection 20d and recess 41d to be made smaller.

[0067] Furthermore, according to this embodiment, since the bottom surface 61a abuts against the sealing member 84, when rotating the insertion portion 61 between a state in which the bottom surface 61a abuts against the tip of the convex portion 20f and a state in which the concave portion 61b and the convex portion 20f overlap to switch between allowing or not allowing fuel to flow into the space S, the rotating member 60 can be rotated with a weak force.

[0068] Furthermore, according to this embodiment, the protrusion 11d is inserted into the recess 20p, so when the nut 30 is rotated to attach the case 10 to the head 20, the case 10 does not rotate together with the nut 30, and the circumferential positioning of the case 10 and the head 20, i.e., the positioning of the drain 12, can be easily performed.

[0069] In this embodiment, the hole 20b is provided in the first flow path hole, but the position of the hole 20b is not limited thereto, and the hole 20b may be provided in any flow path hole (including the first flow path hole and the second flow path hole). For example, the hole 20b may be provided in the second flow path hole (here, between the hollow portion of the cylindrical portion 20j and the outflow portion 20q).

[0070] <Second embodiment> In the first embodiment of the present invention, the hose plug 42 is positioned by inserting the protrusion 20d into the recess 41d, but the structure for positioning the hose plug 42 is not limited to this. A filter device 2 according to a second embodiment will be described below. Note that the same parts as those in the first embodiment are designated by the same reference numerals, and description thereof will be omitted.

[0071] 10 is a cross-sectional view showing an outline of the filter device 2. The filter device 2 mainly includes a case 10, a head 20A, a nut 30, a connecting member 40A, fastening members 51 and 52, a rotating member 60, and a filter element 70.

[0072] The head 20A is provided with a connecting member 40A and a fastening member 51. The connecting member 40A has a cylindrical portion 41A and a hose plug 42 provided in the cylindrical portion 41A.

[0073] The hollow portion of the cylindrical portion 41A communicates with the hollow portion of the hose plug 42. Therefore, fuel stored in the fuel tank is supplied from the tank to the cylindrical portion 41A and flows into the space S in which the filter element 70 is provided via the inlet portion 20a.

[0074] A seal member 81 is provided between the cylindrical portion 41A and the head 20. A recess 41e in which the seal member 81 is provided is provided on the end surface of the cylindrical portion 41A facing the head 20. In addition, a seal member 82 is provided between the cylindrical portion 41A and the columnar portion 51b.

[0075] Figure 11(A) is an oblique view showing an outline of the state in which the fastening member 51 and the connecting member 40A are attached to the head 20A, Figure 11(B) is an oblique view of the main parts of the head 20A, and Figure 11(C) is an oblique view of the connecting member 40A.

[0076] The head 20A differs from the head 20 in that it has a hole 20r (corresponding to the second hole of the present invention) into which one end of the cylindrical portion 41A is inserted.

[0077] The cylindrical portion 41A has an octagonal prism shape and is provided with a plurality of flat surfaces 41f on its outer circumferential surface. When the cylindrical portion 41A is inserted into the hole 20r, the flat surfaces 41f abut against the flat surfaces 20s of the hole 20r. This prevents the coupling member 40A from rotating when the fastening member 51 is rotated to attach it to the head 20A. This allows the hose plug 42 to be positioned with a simple configuration.

[0078] The shape of cylindrical portion 41A is not limited to an octagonal prism, as long as it has at least one flat surface 41f on its outer circumferential surface. For example, cylindrical portion 41A may be hexagonal, or may be cylindrical with a flat portion cut out from its outer circumferential surface. The number of flat surfaces 20s in hole 20r is also not limited to this, as long as the number of flat surfaces 20s is the same as the number of flat surfaces 41f.

[0079] The above describes an embodiment of the present invention in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present invention.

[0080] Furthermore, the above-described embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to having all of the described configurations. For example, the connecting member 40, the fastening member 51, and the structure for attaching them to the head 20, the rotating member 60, and the structure for attaching the rotating member 60 to the head 20, and the structure for attaching the case 10 to the head 20 can each be implemented separately. Furthermore, for example, the connecting member 40, the fastening member 51, and the structure for attaching them to the head 20 do not require the protrusion 20d and the recess 41d, and the connecting member 40 and the fastening member 51 can be attached to the head 20 without using the protrusion 20d and the recess 41d.

[0081] 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 with the configuration of one embodiment.

[0082] 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.

[0083] 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]

[0084] 1: Filter device 10: Case 11: Case body 11a: Bottom 11b: Convex part 11c: Open end 11d: Protrusion 12: Drain 20: Head 20a: Inlet 20b: hole 20c: Female thread 20d: Protrusion 20e: Connecting hole 20f: Convex part 20h: Cylindrical part 20i: Male thread 20j: Cylindrical part 20k, 20l: Bottom 20m, 20n: hole 20o: hole 20p: recess 20q:Outflow part 30: Nut 30a: Protrusion 30b: Female thread 40, 45: connecting member 41: Cylindrical part 41a, 41b: End face 41c, 41d: recessed portion 42: Hose plug 51, 52: Fastening members 51a: Head 51b: Cylindrical part 51c: Male thread 51d: Groove 51e: Hole 51f: recess 52a:Outflow part 60: Rotating member 61: Insertion section 61a: bottom 61b, 61c: recessed portion 62: Lever 70: Filter element 71: Filter medium 72: Inner cylinder 72a :hole 73, 74: Plate 81, 82, 83, 84, 85: sealing members 100: Filter device 110: Case 120: Upper lid 140: Connector 141: Cylindrical part 142 :Tubular part 145: Plain washer 151: Bolt

Claims

1. A cylindrical case with a bottom, a head that covers the opening of the case and has a flow path hole that serves as a flow path for liquid; a filter element disposed in a space defined by the case and the head; a connecting member provided on the head, the connecting member allowing the liquid to flow into the filter element from the flow path hole and allowing the liquid filtered by the filter element to flow out; a fastening member that fixes the connecting member to the head; Equipped with a rotating member rotatably provided on the head, the head is provided with a third hole in which the rotating member is provided, The fastening member has a head, a cylindrical portion that is thinner than the head, and a first male thread portion provided on an outer peripheral surface of the cylindrical portion, the head has a first female thread portion into which the first male thread portion is threaded, the connecting member has a cylindrical portion having one end surface abutting against the head and the other end surface abutting against the head portion; the cylindrical portion is inserted into the hollow portion of the tubular portion, a first seal member having an annular shape is provided between the cylindrical portion and the head, a second seal member having an annular shape is provided between the cylindrical portion and the columnar portion, the rotating member is inserted into the third hole and has a cylindrical insertion portion whose outer diameter is substantially the same as the inner diameter of the third hole; The head has the third hole having a cylindrical shape, a cylindrical protrusion provided on a bottom surface of the third hole and having a diameter smaller than an inner diameter of the third hole, and a connecting hole connecting the third hole and the flow path hole. A filter device characterized by:

2. a first hole communicating with the flow path hole is provided inside the cylindrical portion, a groove communicating with the first hole is provided on at least one of an inner circumferential surface of the cylindrical portion and an outer circumferential surface of the cylindrical portion at a portion where the cylindrical portion and the columnar portion overlap, The second seal member is provided between the groove and the head.

2. The filter device according to claim 1.

3. The cylindrical portion is provided with a first coupling portion, the head is provided with a second coupling portion having a shape corresponding to the first coupling portion, The first connecting portion and the second connecting portion are connected to each other.

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

4. the first coupling portion is at least one first recess provided on the outer circumferential surface of the cylindrical portion, the second coupling portion is a first protrusion provided on the head, The first projection is inserted into the first recess, thereby connecting the first connecting portion and the second connecting portion.

4. The filter device according to claim 3.

5. The head has a second hole into which the cylindrical portion is inserted, the first coupling portion is a first flat surface provided on an outer circumferential surface of the cylindrical portion, the second coupling portion is a second plane that abuts against the first plane, The second hole has the second plane.

4. The filter device according to claim 3.

6. The connecting hole is provided inside the convex portion, and one end opens to the tip surface of the convex portion, A recess is provided on the bottom surface of the insertion portion, the insertion portion is rotatable between a state in which a bottom surface of the insertion portion abuts against a tip of the protrusion and a state in which the recess and the protrusion overlap, a third seal member having an annular shape is provided on an outer peripheral surface of the protrusion, The height of the third seal member is equal to or greater than the height of the protrusion.

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

7. a cylindrical nut that contacts the outer peripheral surface of the case; A second female thread portion is provided on the inner peripheral surface of the nut, The head is provided with a second male thread portion that is threadedly engaged with the second female thread portion, The case has a second projection provided near an open end, The head is provided with a second recess into which the second protrusion is inserted.

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

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