JP4725553B2 - Drain mechanism of fluid filter - Google Patents

Description

  The present invention relates to a drain mechanism of a fluid filter, and more specifically, a fluid filter that includes a loosening-restricting structure having a simple and inexpensive structure that has high strength and excellent durability, and that can suppress loosening of a screw-type drain member. It relates to the drain mechanism.

  2. Description of the Related Art Conventionally, as a fluid filter, for example, an element exchange type fluid filter that replaces a filter element when a filter medium is clogged due to use for a predetermined time and reaches the end of its life is generally known.

  As a drain mechanism 100 of such an element exchange type fluid filter, for example, as shown in FIG. 8, a drain mechanism 103 is screwed into a drain hole 102 formed in a cap 101 is known. (For example, refer patent document 1 etc.). Thus, when the filter element is replaced, prior to releasing the engagement between the case and the cap 101 and separating them, the drain member 103 is loosened and removed from the drain hole 102 to open the drain hole 102. Residual oil inside the housing can be discharged from the drain hole 102.

  However, in the conventional drain mechanism 100, since the drain member 103 is coupled to the drain hole 102 of the cap 101 only by screwing, vibration due to long-time operation of the device equipped with the fluid filter and the screw portion When the tightening torque is reduced due to the deformation, the drain member 103 is easily loosened.

JP 2004-160348 A

  The present invention has been made in view of the above-described situation, and includes a slack-restricting structure having a simple and inexpensive structure with high strength and excellent durability, and a fluid filter capable of suppressing the loosening of a screw-type drain member. An object is to provide a drain mechanism.

The present invention is as follows.
1. A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In the drain mechanism of the fluid filter comprising: a first restricting portion provided on the cap side; and a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member. A loosening restriction structure having a restricting portion and an elastic support that elastically supports at least one of the first restricting portion and the second restricting portion, and one of the first restricting portion and the second restricting portion. Comprises at least one protrusion, the other comprises at least one groove, and the first restricting portion and the second restricting portion are formed of the cap and the drain. Arranged to engage in a state in which the member screwed,
The cap is provided with a seal member that seals with the drain member, and the seal member is provided with the first restricting portion including the protrusion via the elastic support ,
The drain mechanism of a fluid filter, wherein the first restricting portion and the elastic support are provided on an outer peripheral side of the seal member.
2. A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In the drain mechanism of the fluid filter comprising: a first restricting portion provided on the cap side; and a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member. A loosening restriction structure having a restricting portion and an elastic support that elastically supports at least one of the first restricting portion and the second restricting portion, and one of the first restricting portion and the second restricting portion. Comprises at least one protrusion, the other comprises at least one groove, and the first restricting portion and the second restricting portion are formed of the cap and the drain. Arranged to engage in a state in which the member screwed,
The cap is provided with a seal member that seals with the drain member, and the seal member is provided with the first restricting portion including the protrusion via the elastic support,
The drain mechanism of a fluid filter, wherein the first restricting portion and the elastic support are provided on an inner peripheral side of the seal member.
3. A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In the drain mechanism of the fluid filter comprising: a first restricting portion provided on the cap side; and a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member. A loosening restriction structure having a restricting portion and an elastic support that elastically supports at least one of the first restricting portion and the second restricting portion, and one of the first restricting portion and the second restricting portion. Comprises at least one protrusion, the other comprises at least one groove, and the first restricting portion and the second restricting portion are formed of the cap and the drain. Arranged to engage in a state in which the member screwed,
The drain member is provided with a seal member that seals with the cap, and the seal member is provided with the second restricting portion including the protrusion via the elastic support ,
The drain mechanism for a fluid filter, wherein the second restricting portion and the elastic support are provided on an outer peripheral side of the seal member.
4). A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In the drain mechanism of the fluid filter comprising: a first restricting portion provided on the cap side; and a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member. A loosening restriction structure having a restricting portion and an elastic support that elastically supports at least one of the first restricting portion and the second restricting portion, and one of the first restricting portion and the second restricting portion. Comprises at least one protrusion, the other comprises at least one groove, and the first restricting portion and the second restricting portion are formed of the cap and the drain. Arranged to engage in a state in which the member screwed,
The drain member is provided with a seal member that seals with the cap, and the seal member is provided with the second restricting portion including the protrusion via the elastic support,
The drain mechanism of a fluid filter, wherein the second restricting portion and the elastic support are provided on an inner peripheral side of the seal member.

  According to the drain mechanism of the fluid filter of the present invention, in the tightened state of the cap and the drain member, the second regulating portion on the drain member side is located near or in contact with the first regulating portion on the cap side. Is done. And even if the screwing of the cap and the drain member is slightly loosened from this state, the cap and the drain member are restricted from rotating more than necessary due to the contact of the first restricting portion and the second restricting portion. Thereby, it can suppress that a drain member loosens and raise | generates an oil leak. In addition, since at least one of the first restricting portion and the second restricting portion is elastically supported by the elastic support body, the first restricting portion and the second restricting portion are temporarily applied when the drain member is screwed into the cap. Even in the contact state, the elastic support body is elastically deformed, and the first restricting portion or the second restricting portion absorbs or diverges the pressure caused by the contact, so that the damage can be prevented.

Further, the sealing member is provided for sealing between the drain member to the cap, when the first regulating portion consisting of the projection on the sealing member is provided through the elastic support, the sealing member Thereby, the sealing performance between the cap and the drain member can be improved. Moreover, since the seal member, the first restricting portion, and the elastic support can be used together, an increase in the number of parts can be suppressed. In addition, since the sealing member is provided on the cap side, for example, when the internal fluid is discharged using the drain jig, the sealing performance between the drain jig and the cap can be improved, and surrounding contamination can be prevented as much as possible.
Further, in the case where the first restricting portion and the elastic support member are formed of protrusions provided on the outer peripheral side of the seal member, the loosening restricting structure does not come into contact with the fluid to be filtered. Can be prevented.
In addition, one of the first restricting portion and the second restricting portion is composed of at least one protrusion, and the other is composed of at least one groove, and the first restricting portion and the second restricting portion are the cap and the since it is arranged to engage in a state in which the drain member is screwed to the first restricting portion and the second restricting portion engaged when these are screwed when screwing the drain member to the cap. Therefore, the operator can confirm an appropriate torque for tightening the drain member. Thereby, the drain member can be tightened with an appropriate torque, and liquid leakage due to insufficient tightening or deterioration of the seal member due to excessive tightening can be suppressed.
In addition, when the first restricting portion and the elastic support body are formed of protrusions provided on the inner peripheral side of the seal member, the seal member can be disposed at the back of the screw portion of the cap and the drain member. The screw portion can be prevented from being contaminated with liquid.
Further, the with the drain member is provided with a sealing member for sealing between the cap, if the said sealing member and the second regulating portion consisting of said protrusion is provided through the elastic support, the sealing member ∎ You can with improved sealability between the cap and the drain member. Further, since the seal member, the second restricting portion, and the elastic support can be used together, an increase in the number of parts can be suppressed. Moreover, since the seal member is provided on the drain member side, the seal member can be easily replaced.
Further, in the case where the second restricting portion and the elastic support are made of protrusions provided on the outer peripheral side of the seal member, the loosening restricting structure does not come into contact with the fluid to be filtered. Can be prevented.
Further, in the case where the second restricting portion and the elastic support body are formed of protrusions provided on the inner peripheral side of the seal member, the seal member can be disposed at the back of the screw portion of the cap and the drain member. The screw portion can be prevented from being contaminated with liquid.

1. Fluid Filter The fluid filter according to the present invention includes a drain mechanism and a housing described below. This fluid filter can comprise, for example, a filter element housed in a housing.
The “housing” is not particularly limited in its structure, shape, material, and the like as long as it includes a cap and a case that can be engaged and disengaged with each other. Examples of the engagement / disengagement mechanism between the cap and the case include, for example, (1) a screwing mechanism including male and female screw portions that can be screwed together, and (2) a bayonet mechanism including a groove portion and a convex portion that can be engaged and disengaged with each other. Can be mentioned. The case is usually formed with an inflow port for taking in liquid from the outside and an outflow port for delivering the liquid to the outside.

2. Drain mechanism The drain mechanism according to the present invention includes a cap, a drain member, and a loosening restriction structure described below.
As long as the “cap” is engaged with the case and has a drain hole, its structure, shape, material, etc. are not particularly limited. The cap side includes a first restricting portion described later.
As long as the “drain member” is detachably attached to the cap from the outside and can close the drain hole, the structure, shape, material, and the like are not particularly limited. The drain member side includes a second restricting portion described later. Moreover, this drain member can have a plug part in which a male screw that can be screwed into a female screw formed on the inner peripheral surface of the drain hole is formed, for example.
Usually, a seal member (for example, an O-ring or the like) is provided between the drain member and the cap.
The installation form of the “seal member” includes, for example, (1) a form in which a seal member is interposed between a bottom part of the cap and a flange part provided on the drain member, and (2) the drain hole Examples include one or a combination of two or more forms in which a seal member is interposed between the inner peripheral surface and the outer peripheral surface of the drain member (for example, the outer peripheral surface of the plug portion). Can do.
The “loosening-around restricting structure” includes the first restricting portion, the second restricting portion, and an elastic support described later.
As long as the “first regulating portion” is provided on the cap side, its structure, shape, material, etc. are not particularly limited. The first restricting portion can be formed on the cap itself or when the seal member is attached to the cap.
As long as the “second regulating portion” is provided on the drain member side, the structure, shape, material, and the like are not particularly limited. The second restricting portion can be formed on the drain member itself, or when the seal member is attached to the drain member.
The first restricting portion and the second restricting portion are brought into contact with each other by relative rotation of the cap and the drain member, and the cap and the drain member are tightened with respect to the cap-side first restricting portion. Thus, the second restricting portion on the drain member side is located at a position where it approaches or abuts. And even if the screwing of the cap and the drain member is slightly loosened from this state, the cap and the drain member are restricted from rotating more than necessary due to the contact of the first restricting portion and the second restricting portion.
As long as the “elastic support” elastically supports at least one of the first restricting portion and the second restricting portion, its structure, shape, material, etc. are not particularly limited. When the drain member is screwed into the cap, the elastic support body is elastically deformed and the first restricting portion or the second restricting portion comes into contact even if the first restricting portion and the second restricting portion are temporarily in contact with each other. Since the pressure due to the water is absorbed or released, the mutual damage is prevented.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, an oil filter attached to a cylinder block (not shown) of an internal combustion engine is exemplified as the element exchange type filter.

(1) Configuration of Oil Filter As shown in FIG. 1, the oil filter 1 according to the present embodiment is housed in a housing 4 including a metal case 2 and a cap 3 that are detachable from each other, and the housing 4. The filter element 5 and the drain mechanism 7 are provided.

  An external thread portion 8 is formed on the outer peripheral surface of the cap 3 and an O-ring 9 is attached. An internal thread portion 10 is formed on the inner peripheral surface of the case 2. When the male screw portion 8 and the female screw portion 10 are screwed together and the case 2 and the cap 3 are engaged via the O-ring 9, the inside of the housing 4 is sealed so as to be kept liquid tight. . Inside the housing, the upper and lower ends of the filter element 5 are sealed by the case protrusions 6 provided on the plate 12 and the case 2 by the urging force of the spring 11 via the sealing members 13 and 14. Thus, the oil is filtered.

  Further, a drain hole 15 having a female screw 15a formed on the inner periphery thereof is provided at the center of the bottom 3a of the cap 3. An O-ring 17 that is a seal member is attached to the lower end portion of the bottom 3 a of the cap 3 so as to surround the drain hole 15. Furthermore, an annular cap protrusion 18 is provided at the upper end of the bottom 3 a of the cap 3.

  Next, the drain mechanism 7 will be described. As shown in FIGS. 1 and 2, the drain mechanism 7 includes a metal drain bolt 20 that is a drain member, a metal valve member 21, and a spring 11. The drain bolt 20 has a plug portion 22 in which a male screw 22 a is formed, and a flange portion 23 connected to the lower portion of the plug portion 22. Then, when the male screw 22 a of the drain bolt 20 and the female screw 15 a of the drain hole 15 are screwed together and the drain bolt 20 is screwed into the drain hole 15, the flange portion 23 of the drain bolt 20 is pressed against the O-ring 17. Thus, the drain hole 15 is sealed.

  The valve member 21 is formed in a tray shape as a whole, and has a contact portion 25 that contacts the outer peripheral surface of the cap protrusion 18. The contact portion 25 of the valve member 21 is normally brought into contact with the cap protrusion 18 by the biasing force of the spring 11, and the drain hole 15 is metal-sealed. Therefore, even if the drain bolt 20 is removed from the drain hole 15, only a small amount of residual oil inside the housing 4 flows out from the drain hole 15 to the outside.

(2) Loosening restriction structure A loosening restriction structure 40 is provided between the cap 3 and the drain bolt 20. As shown in FIGS. 1 to 4, the loosening restriction structure 40 includes a first restriction portion 41 provided on the cap 3 side, a second restriction portion 42 provided on the drain bolt 20 side, and the first restriction portions. And an elastic support 43 that elastically supports at least one of the portion 41 and the second restricting portion 42. The first restricting portion 41 and the second restricting portion 42 come into contact with each other by the relative rotation of the cap 3 and the drain bolt 20.

  In the present embodiment, the first restricting portion 41 and the elastic support body 43 are formed by protrusions provided on the outer peripheral portion of the O-ring 17. Further, the second restricting portion 42 is composed of one arc-shaped groove formed in the flange portion 23 of the drain bolt 20. And the 1st control part 41 and the 2nd control part 42 are arrange | positioned so that the cap 3 and the drain bolt 20 may be engaged in the state screwed together.

  At both ends of the second restricting portion 42, a first abutment surface 44 with which the first restricting portion 41 abuts when rotating the drain bolt 20 in the tightening direction, and a first restriction when rotating the drain bolt 20 in the loosening direction. A second abutment surface 45 with which the portion 41 abuts is formed. The first contact surface 44 is tapered, and the second contact surface 45 is vertical.

(3) Action of Oil Filter Next, the action of the oil filter 1 will be described. At the time of assembling the oil filter 1 or after discharging the oil from the drain hole 15, the drain bolt 20 is screwed into the drain hole 15 of the cap 3 through the O-ring 17. At this time, the first contact surface 44 of the second restricting portion 42 of the drain bolt 20 contacts the first restricting portion 41 of the O-ring 17, but the first restricting portion 41 follows the taper of the first contact surface 44. The elastic support body 43 is elastically deformed and the first restricting portion 41 rides on the flange portion 23 outside the second restricting portion 42. When the drain bolt 20 is further tightened to reach an appropriate torque, the first restricting portion 41 comes to the position of the second restricting portion 42 and enters the second restricting portion 42 by the elastic support body 43.

  When the oil filter is used, the first restricting portion 41 comes into contact with the vertical second contact surface 45 of the second restricting portion 42 even if the drain bolt 20 tries to rotate in a loosening direction due to, for example, long-time vibration. Therefore, loosening of the drain bolt 20 can be prevented without riding up.

  Further, when removing the drain bolt 20 in order to drain the oil from the drain hole 15, a large force is applied to the drain bolt 20 to rotate it in a loosening direction. Thereby, the 1st control part 41 and the elastic support body 43 deform | transform or are damaged, and remove | deviate from the 2nd control part 42. FIG. Since the O-ring 17 is assumed to be replaced every time the drain is removed, the first restricting portion 41 may be damaged.

(4) Configuration of Draining Jig Next, the draining jig 30 will be described. As shown in FIG. 5, the draining jig 30 is made of synthetic resin and has a cylindrical shape as a whole. This draining jig 30 is provided in a pipe-shaped portion 31 having both ends opened, a locking portion 32 having a shape bulging outwardly provided at the upper end portion of the pipe-shaped portion 31, and an intermediate portion of the pipe upper portion 31. And a receiving plate-like flange portion 33.

  The pipe-like portion 31 is formed with a drain passage 35 including a center hole 35a and a plurality of slits 35b cut out downward from the upper end thereof. Further, the locking portion 32 can be engaged with and disengaged from the cap protrusion 18 with elastic deformation by the slit 35 b, so that the draining jig 30 can be fixed to and released from the cap 3. Further, in a state where the drain jig 30 is fixed to the cap 3, the flange portion 33 of the drain jig 30 is pressed against the O-ring 17 of the cap 3 and sealed (see FIG. 5).

  In a state where the valve member 21 is removed from the drain hole 15, the operator inserts the drain jig 30 into the drain hole 15 and presses the valve member 21 against the biasing force of the spring 11 at the tip side. Then, the seal of the drain hole 15 by the valve member 21 is released, and the residual oil inside the housing 4 is discharged to the outside through the slit 35b and the center hole 35a formed in the drain jig 30. .

(5) Effects of the Embodiment As described above, in the present embodiment, the cap 3 is provided with the O-ring 17 that performs the seal with the drain bolt 20, so the seal between the cap 3 and the drain bolt 20 is provided. Can be improved. Further, since the O-ring 17 is formed with the first restricting portion 41 and the elastic support body 43, the O-ring 17 can be used as the first restricting portion 41 and the elastic support body 43, so that an increase in the number of parts can be suppressed. it can. Furthermore, since the O-ring 17 is provided on the cap 3 side, when draining the internal fluid using the drain jig 30, the sealing property between the drain jig 30 and the cap 3 is improved and the surrounding contamination is increased. Can be prevented as much as possible.

  In the present embodiment, the first restricting portion 41 and the elastic support body 43 are formed by protrusions provided on the outer peripheral portion of the O-ring 17, so that the fluid to be filtered is not loosened and the restricting structure 40 is not touched. Deterioration such as corrosion of the turning regulation structure 40 can be prevented.

  In the present embodiment, the second restricting portion 42 is composed of one groove formed in the flange portion 23 of the drain bolt 20, and the first restricting portion 41 and the second restricting portion 42 are the cap 3 and the drain bolt 20. Are arranged so as to engage with each other so that when the drain bolt 20 is screwed into the cap 3, the first restricting portion 41 and the second restricting portion 42 are engaged when they are screwed together. become. Therefore, the operator can confirm the proper torque for tightening the drain bolt 20, realize the tightening of the drain bolt 20 with the proper torque, and cause deterioration of the O-ring 17 due to liquid leakage due to insufficient tightening or excessive tightening. Etc. can be suppressed.

  In this embodiment, both end portions of the second restricting portion 42 are formed with a tapered first contact surface 44 against which the first restricting portion 41 comes into contact when rotating the drain bolt 20 in the tightening direction. A second contact surface 45 with which the first restricting portion 41 comes into contact when the bolt 20 is rotated in the loosening direction is formed vertically. For this reason, when the drain bolt 20 is fastened to the cap 3, the first restricting portion 41 can easily escape from the second restricting portion 42 along the first contact surface 44, so that the tightening operation is not hindered. . In addition, after the drain bolt 20 is tightened, even if the drain bolt 20 tries to loosen due to vibration or the like, the first restricting portion 41 comes into contact with the second abutting surface 45 of the second restricting portion 42, so that the drain bolt 20 is surely loosened. Can be prevented.

In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above-described embodiment, the second restricting portion 42 is made of one groove, but is not limited to this. For example, the second restricting portion 42 may be made of a plurality of grooves, or may be made of one or a plurality of protrusions. You may make it consist. In particular, when it is made of a single protrusion, the first restricting portion 41 and the second restricting portion 42 are preferably provided at positions where they are engaged when the cap and the drain bolt are screwed together.
Moreover, in the said Example, although the 1st contact surface 44 of the 2nd control part 42 is formed in the taper shape, it is not limited to this, For example, it is set as a perpendicular | vertical surface like the 2nd contact surface 45, for example. Also good.
Furthermore, in the said Example, although the 1st control part 41 shall consist of one processus | protrusion, it is not limited to this, For example, you may consist of a some processus | protrusion.
Moreover, in the said Example, although the O-ring 17 was provided in the cap 3, and the 1st control part 41 and the elastic support body 43 were provided in the O-ring 17, it is not limited to this, For example, it shows in FIG. As described above, the O-ring 17 may be provided on the drain bolt 20 and the second restricting portion 42 and the elastic support body 43 may be provided on the O-ring 17. In this case, a first restricting portion 41 made of a groove or the like is formed on the cap 3 side (not shown). Also in this case, the second restricting portion 42 and the elastic support body 43 can be composed of one or a plurality of protrusions provided on the outer peripheral side or inner peripheral side of the O-ring 17. In this case, since the O-ring 17 is provided on the drain bolt 20 side, the O-ring 17 can be replaced more easily than when the O-ring 17 is mounted on the cap 3 side.
Further, in the above embodiment, the first restricting portion 41 and the elastic support body 43 or the second restricting portion 42 and the elastic support body 43 are made of protrusions provided on the outer peripheral portion of the O-ring 17. For example, the protrusion may be a protrusion provided on the inner peripheral portion of the O-ring 17. In this case, the O-ring 17 is disposed at the back of the screw portion of the cap 3 and the drain bolt 20. For this reason, it can prevent that this screw part is contaminated with the liquid. Also in this case, the O-ring 17 can be provided on the cap 3 side or the drain bolt 20 side (see FIG. 7), as in the case of being provided on the outer peripheral portion of the O-ring 17.
In the above embodiment, the O-ring 17 is interposed between the cap 3 and the drain bolt 20. However, the present invention is not limited to this. For example, the O-ring 17 is provided when the sealing property is not particularly problematic. It does not have to be. In this case, the 1st control part 41 and the 2nd control part 42 can be integrally formed with the cap 3 and the drain bolt 20, or can be attached with another member.

  It is widely used in oil filters, fuel filters and related fields for filtering foreign matters, wear powder, carbon and the like mixed in oil for lubricating an internal combustion engine.

It is a longitudinal cross-sectional view of the filter which concerns on an Example. It is an enlarged view of a drain mechanism. It is a figure which shows a drain bolt, (A) is a top view, (B) is a front view. It is a figure which shows an O-ring, (A) is a top view, (B) is a front view. It is a principal part expanded sectional view in the discharge state of the oil of an oil filter. It is explanatory drawing for demonstrating the drain bolt and O-ring of another form. Furthermore, it is explanatory drawing for demonstrating the drain bolt and O-ring of another form. It is a longitudinal cross-sectional view for demonstrating the conventional drain mechanism.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1; Oil filter, 3; Cap, 7: Drain mechanism, 17: O-ring, 20: Drain bolt, 40: Loosening restriction structure, 41; First restriction part, 42; Second restriction part, 43; .

Claims (4)

A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In a fluid filter drain mechanism comprising:
A first restricting portion provided on the cap side, a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member, and the first restricting portion, An elastic support body that elastically supports at least one of the second restriction portions;
One of the first restricting portion and the second restricting portion is composed of at least one protrusion, and the other is composed of at least one groove,
The first restricting portion and the second restricting portion are arranged to engage with each other in a state where the cap and the drain member are screwed together ,
The cap is provided with a seal member that seals with the drain member, and the seal member is provided with the first restricting portion including the protrusion via the elastic support ,
The drain mechanism of a fluid filter, wherein the first restricting portion and the elastic support are provided on an outer peripheral side of the seal member. A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In a fluid filter drain mechanism comprising:
A first restricting portion provided on the cap side, a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member, and the first restricting portion, An elastic support body that elastically supports at least one of the second restriction portions;
One of the first restricting portion and the second restricting portion is composed of at least one protrusion, and the other is composed of at least one groove,
The first restricting portion and the second restricting portion are arranged to engage with each other in a state where the cap and the drain member are screwed together ,
The cap is provided with a seal member that seals with the drain member, and the seal member is provided with the first restricting portion including the protrusion via the elastic support ,
The drain mechanism of a fluid filter, wherein the first restricting portion and the elastic support are provided on an inner peripheral side of the seal member. A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In a fluid filter drain mechanism comprising:
A first restricting portion provided on the cap side, a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member, and the first restricting portion, An elastic support body that elastically supports at least one of the second restriction portions;
One of the first restricting portion and the second restricting portion is composed of at least one protrusion, and the other is composed of at least one groove,
The first restricting portion and the second restricting portion are arranged to engage with each other in a state where the cap and the drain member are screwed together ,
The drain member is provided with a seal member that seals with the cap, and the seal member is provided with the second restricting portion including the protrusion via the elastic support ,
The drain mechanism for a fluid filter, wherein the second restricting portion and the elastic support are provided on an outer peripheral side of the seal member. A cap attached to the case and having a drain hole; and a drain member that can be screwed into the cap by relative rotation, closes the drain hole by screwing, and opens the drain hole by releasing the screwing. In a fluid filter drain mechanism comprising:
A first restricting portion provided on the cap side, a second restricting portion provided on the drain member side and contacting the first restricting portion by relative rotation of the cap and the drain member, and the first restricting portion, An elastic support body that elastically supports at least one of the second restriction portions;
One of the first restricting portion and the second restricting portion is composed of at least one protrusion, and the other is composed of at least one groove,
The first restricting portion and the second restricting portion are arranged to engage with each other in a state where the cap and the drain member are screwed together ,
The drain member is provided with a seal member that seals with the cap, and the seal member is provided with the second restricting portion including the protrusion via the elastic support ,
The drain mechanism of a fluid filter, wherein the second restricting portion and the elastic support are provided on an inner peripheral side of the seal member.

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