JP2011062658A - Spin-on filter and element assembly for the filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spin-on filter capable of preventing foreign matter from entering into a surface contact part between a filter head and a case and a screw connection part from an outside; and to provide an element assembly for the spin-on filter. <P>SOLUTION: The spin-on filter includes a gasket 70 which is disposed so as to be held between a filter head 2 and an element case 30 on the outer side than the screw connection part by means of a male screw 21a formed on a filter head 2 (body 10) and a female screw 36a formed on an element case 30 (case cover 35) and the surface contact part between a first seal surface 10a formed on the filter head 2 and a second seal surface 35a formed on the element case 30, and prevents foreign matter from entering the screw connection part and the surface contact part from the external part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a spin-on filter used for filtering fluid such as oil, and more particularly to a spin-on filter used in an environment where the fluid pressure is high and an element assembly for the filter.

  Spin-on filters have been conventionally used in various ways as engine oil filters and the like. A conventional spin-on filter is configured such that an element assembly including a filter element in a cylindrical case is detachably attached to a filter head fixed to an engine or the like, and is detachably attached. (For example, refer to Patent Document 1). When the hydraulic oil is filtered in such a spin-on filter, the hydraulic pressure of the hydraulic oil in the case acts in a direction to push the case downward and away from the filter head. This force acts on the screw coupling portion between the filter head and the case, but in the spin-on filter disclosed in Patent Document 1, since the inflow passage and the outflow passage are provided on the inner diameter side of the screw coupling portion, The effective diameter of the screw portion can be increased, thereby making it possible to sufficiently increase the strength of the screw coupling portion and to be used even in an environment where the hydraulic pressure is high. Yes. In addition, by providing a seal ring and a surface contact part between the filter head and the case on the outer peripheral side of the screw coupling part, the hydraulic oil can be prevented from leaking to the outside even if the hydraulic pressure in the case becomes high. Can be done.

JP-A-5-96107

  By the way, in such a spin-on filter, when the working hydraulic pressure in the case becomes higher, the force acting in the direction of pushing the case downward and away from the filter head increases, so that the surface contact portion between the filter head and the case is slightly increased. Gaps may occur. At this time, if foreign matter such as mud or dust enters the gap from the outside, the force acting on the screw connection part will remain without being released even if the hydraulic pressure in the case is sufficiently reduced. There is a problem that a larger torque than usual is required to remove the head from the head.

  The present invention has been made in view of such problems, and a spin-on filter that can prevent foreign matter from entering the surface contact portion and the screw coupling portion between the filter head and the case and an element assembly for the filter. The purpose is to provide a solid.

  To achieve the above object, a spin-on filter according to the present invention (for example, the oil filter 1 in the embodiment) includes a filter head and a case (for example, the element case 30 in the embodiment) with a filter element built therein. And an element assembly that is screwed onto the filter head. At this time, the case has a case main body having an upper end opened and a lower end closed, and a cover member (for example, the case cover 35 in the embodiment) attached to the case main body so as to cover the upper end opening. The element assembly is configured by attaching the cover member in a state where the filter element is built in the case body. The filter head is provided with a projecting connection portion formed in a cylindrical shape (for example, the outer cylindrical portion 21 in the embodiment) and a male screw is formed on the outer peripheral surface of the projecting connection portion. A through-hole penetrating vertically is formed and a female screw is formed in the through-hole. The male screw and the female screw are screwed together so that the element assembly can be detachably attached to the filter head. When the element assembly is attached to the filter head, the filter head and the cover member come into surface contact so that the space between the filter head and the cover member is sealed. Composed. In addition, it is provided so as to be sandwiched between the filter head and the cover member outside the screw coupling portion and the surface contact portion, and foreign matter enters the screw coupling portion and the surface contact portion from the outside. A sealing member (for example, the gasket 70 in the embodiment) for preventing this is provided.

  In the spin-on filter configured as described above, the seal member is formed using an elastic material, and has a lip portion that is formed upright toward the filter head, and the lip portion is connected to the filter head. It is preferable that the filter head and the cover member are clamped between the filter head and the cover member in a state of elastic deformation. In the seal member, it is preferable that the lip portion is formed to be inclined outward so that a tip end portion thereof is located outside a base end portion.

  In the spin-on filter configured as described above, the seal member preferably includes a plurality of the lip portions.

  In the spin-on filter configured as described above, it is preferable that the seal member is fixed to the cover member and configured integrally with the element assembly.

  On the other hand, an element assembly for a spin-on filter according to the present invention includes a case body whose upper end is open and whose lower end is closed, and a filter that is inserted and held in the case body and that filters the fluid flowing through the case body An element and a cover member attached to the upper end portion of the case body so as to cover the opening in a state where the filter element is disposed in the case body. The cover member is formed with a through-hole penetrating vertically, and a female screw is formed in the through-hole. The female screw is screwed to a male screw formed on the filter head, and the element assembly is attached to the cover member. The filter head can be detachably attached to the filter head. When the filter head is attached to the filter head in this way, the cover member comes into surface contact with the filter head and seals a space between the cover member and the filter head. Configured to do. In addition, when the element assembly is attached to the filter head, the cover member and the filter head are provided on the cover member outside the portion in surface contact with the female screw and the filter head. And a seal member that prevents foreign matter from entering the screw coupling portion and the surface contact portion from the outside.

  In the element assembly for a spin-on filter having the above-described configuration, the seal member is formed using an elastic material and has a lip portion formed so as to stand upward, and the element assembly includes the filter head. When the lip portion is attached to the filter head, it is preferable that the lip portion is sandwiched between the filter head and the cover member in a state where the lip portion is elastically deformed in contact with the filter head. In the seal member, it is preferable that the lip portion is formed to be inclined outward so that a tip end portion thereof is located outside a base end portion.

  In the spin-on filter element assembly configured as described above, it is preferable that the seal member includes a plurality of the lip portions.

  According to the spin-on filter and the filter element assembly according to the present invention, the seal member is provided so as to be sandwiched between the filter head and the cover member (case) outside the screw coupling portion and the surface contact portion. Even if a slight gap is generated in the surface contact portion between the filter head and the case, foreign matters such as mud and dust can be prevented from entering the gap and the screw coupling portion from the outside. For this reason, when the operating hydraulic pressure in the case is sufficiently reduced, the force acting on the screw coupling portion is released, so that the case (element assembly) can be removed from the filter head by a normal magnitude torque. . In addition, it is possible to prevent water from entering the surface contact portion and the screw coupling portion from the outside by the seal member, thereby preventing corrosion of the screw coupling portion and the like.

  In the above spin-on filter and element assembly, the seal member is formed using an elastic material and has a lip portion that is formed upright toward the filter head, and the lip portion is in contact with the filter head. It is preferable to be configured to be sandwiched between the filter head and the cover member in a state of being elastically deformed. Further, at this time, in the sealing member, it is preferable that the lip portion is formed to be inclined outward so that the tip end portion is located outside the base end portion. In general, the larger the crushing margin, the better the sealing performance (sealability) and dimensional stability. However, the surface of the surface contact portion between the filter head and the cover member (case) must be increased unless the tightening (mounting) torque is increased. When pressure decreases and hydraulic pressure fluctuations and vibrations occur, it becomes easy to loosen. However, when the sealing member has the lip portion as described above, the case (element assembly) can be attached to the filter head with a low torque while maintaining the sealing performance with a sufficient crushing allowance.

  In the above spin-on filter and element assembly, the seal member is preferably configured to have a plurality of lip portions. With this configuration, the seal member can be used without increasing the mounting torque of the case so much. Sealability can be further improved.

  In the above spin-on filter, it is preferable that the seal member is fixed to the cover member and configured integrally with the element assembly. With such a configuration, the element assembly is removed from the filter head as necessary. When the element is replaced with a new element assembly, the seal member is also replaced together, so that the initial performance of the seal member can be maintained.

It is sectional drawing which shows the oil filter which concerns on 1st Embodiment of this invention. It is a principal part enlarged view of sectional drawing which shows the said oil filter. It is sectional drawing which shows the element assembly which comprises the said oil filter. (A) is a top view which shows the gasket which comprises the said element assembly, (b) is sectional drawing shown along arrow bb in (a). It is sectional drawing which shows the oil filter which concerns on 2nd Embodiment of this invention. It is a principal part enlarged view of sectional drawing which shows the said oil filter.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an oil filter 1 that is an example of a spin-on filter according to the present invention includes a filter head 2 and an element assembly 3 that is detachably screw-attached to the filter head 2. Configured. In this oil filter 1, the filter head 2 is fixed to, for example, a hydraulic device, and the element assembly 3 is removed from the filter head 2 and replaced with a new element assembly 3 as necessary.

  The filter head 2 is entirely constituted by a body 10 made of a metal material such as cast iron or aluminum. The body 10 has an inlet port 11 and an outlet port 13 and communicates with these ports 11 and 13 respectively. A first passage 12 and a second passage 14 are formed as shown. Both the passages 12 and 14 are separated by a wall 15, and a bypass passage 15 a connecting both the passages 12 and 14 is formed in the wall portion 15, and a relief valve 18 is provided in the bypass passage 15 a. . The relief valve 18 normally closes the bypass passage 15a, and the differential pressure P (= P1-P2) between the hydraulic pressure P1 in the first passage 12 and the hydraulic pressure P2 in the second passage 14 is equal to or higher than a predetermined pressure Pa (P>). When Pa), the bypass passage 15a is opened.

  As shown in FIG. 2, a double-cylindrical projecting portion including an outer cylindrical portion 21 and an inner cylindrical portion 23 projecting downward is provided on the lower surface side of the body 10. For this reason, a ring-shaped outer passage 22 extending in the vertical direction is formed between the inner peripheral surface of the outer cylindrical portion 21 and the outer peripheral surface of the inner cylindrical portion 23, and the first passage 12 is formed above the outer passage 22. It communicates and the lower part is open. A cylindrical inner passage 24 extending vertically is formed in the inner cylindrical portion 23, and communicates with the second passage 14 at the upper portion of the inner passage 24, and the lower portion is opened.

  As shown in the figure, the inner cylindrical portion 23 projects more downward than the outer cylindrical portion 21, and the lower end portion 23 a of the inner cylindrical portion 23 protrudes further downward than the lower end portion of the outer cylindrical portion 21. ing. A male screw 21 a is formed on the outer peripheral surface of the outer cylindrical portion 21. On the lower surface of the body 10 on the outer peripheral side from the outer cylindrical portion 21, a first seal surface 10a that abuts on a first seal ring 61 and a second seal surface 35a formed on the upper surface of a case cover 35 described later is formed. . Furthermore, a third seal surface 10b that comes into contact with a gasket 70 described later is formed on the lower surface of the body 10 on the outer peripheral side of the first seal surface 10a.

  As shown in FIG. 3, the element assembly 3 includes an element case 30 and a filter element 50 inserted and held in the element case 30. The element case 30 includes a cylindrical case body 31 having an upper end opened and a lower end closed, and a case cover 35 attached to cover the upper end opening of the case body 31.

  The case cover 35 is made of a metal material in the same manner as the filter head 2, and a through hole 36 penetrating vertically is formed at the center of the case cover 35. A female screw 36a that is screwed with the male screw 21a is formed. For this reason, the element assembly 3 can be attached to the filter head 2 while rotating, by screwing the female screw 36 a with the male screw 21 a of the outer cylindrical portion 21. A plurality of communication holes 37 penetrating vertically are formed in the case cover 35 on the outer peripheral side from the through hole 36. The communication hole 37 is used for sucking outside air and discharging oil above the element assembly 3 while the screw engagement remains when the element assembly 3 is replaced. It is possible to prevent the hydraulic oil from falling at once and splashing to the operator or the device at the moment when the screw is removed by 37.

  A ring-shaped stepped portion 35b is formed on the upper surface of the case cover 35 on the outer peripheral side from the communication hole 37, and a first seal ring 61 is installed on the stepped portion 35b. Further, on the upper surface of the case cover 35 on the outer peripheral side with respect to the stepped portion 35b, a second seal surface 35a that abuts on the first seal surface 10a formed on the lower surface of the filter head 2 (body 10) is formed. Further, a ring-shaped concave groove 35c is formed on the upper surface of the case cover 35 on the outer peripheral side from the second seal surface 35a, and a gasket 70 described later is installed in the concave groove 35c.

  A ring-shaped groove 38 is formed on the outer peripheral surface of the case cover 35. After the case cover 35 is inserted into the upper end opening of the case main body 31, the upper end portion of the case main body 31 is press-formed inward. It enters into the ring-shaped groove 38. Thereby, the case cover 35 is firmly coupled to the upper end portion of the case main body 31. A second seal ring 62 for sealing (sealing) the coupling portion is installed in a seal ring groove formed below the ring-shaped groove 38 and covered with the case body 31. A plurality of guide portions 40 projecting downward are provided on the outer periphery of the lower end of the case cover 35. A stepped portion is formed on the inner peripheral portion of each guide portion 40, and the upper end outer peripheral portion of the filter element 50 is supported by the stepped portion.

  The filter element 50 includes a filter medium 54 having a cross section of a chrysanthemum shape and an outer diameter of a substantially cylindrical shape by joining ends of the filter medium bent in a bellows shape. The inner peripheral portion is supported by a cylindrical center tube 53. The center tube 53 has a large number of small holes 53a and is made of a punch sheet or the like. The hydraulic oil filtered through the filter medium 54 passes through the small holes 53a and is the inner space. It flows into the two spaces 82.

  A compression coil spring 55 is disposed at the bottom of the case body 31, and the filter element 50 is urged upward by the compression coil spring 55. For this reason, the outer peripheral portion of the upper end of the filter element 50 (the outer peripheral portion of the upper end plate 51) is received by the guide portion 40 formed in the case cover 35, and in this state, the filter element 50 is held in the element case 30. Yes. If it hold | maintains in this way, the space in the element case 30 will be divided | segmented into the 1st space 81 outside the filter element 50, and the 2nd space 82 in the filter element 50 (center tube 53).

  The upper end plate 51 of the filter element 50 is formed with a communication hole 51a penetrating vertically at the center thereof, and this communication hole is held in the element case 30 as described above. 51 a faces the through hole 36 of the case cover 35. Therefore, in a state before the element assembly 3 is attached to the filter head 2 (single state shown in FIG. 3), the second space 82 in the center tube 53 is connected to the first space 81 via the communication hole 51a. Communicate. A third seal ring 63 is provided on the inner periphery of the communication hole 51a.

  When the element assembly 3 is attached to the filter head 2 while rotating so that the female screw 36a of the case cover 35 is screwed with the male screw 21a of the outer cylindrical portion 21, as shown in FIGS. The lower end portion 23 a of the cylindrical portion 23 enters the communication hole 51 a of the upper end plate 51. Therefore, the first space 81 is partitioned by the inner cylindrical portion 23 and separated from the second space 82, and the second space 82 communicates with the inner passage 24 through the communication hole 51a. At this time, this portion is sealed by the third seal ring 63. At the same time, the first space 81 communicates with the outer passage 22, and this space is outside the screw coupling portion, the first seal ring 61 sandwiched between the stepped portion 35 b and the first seal surface 10 a, and Sealing is performed by a contact portion between the first seal surface 10a and the second seal surface 35a.

  The gasket 70 is for preventing foreign matter such as mud and dust and water from entering between the filter head 2 (body 10) and the case cover 35 from the outside, and is formed in a ring shape using an elastic material such as rubber. Formed on the outer peripheral side of the screw coupling portion formed by the male screw 21a and the female screw 36a and the contact portion formed by the first seal surface 10a and the second seal surface 35a. As shown in FIG. 4, a ring-shaped convex portion 71 is formed on the lower surface of the gasket 70, and the convex portion 71 is fitted into a concave groove 35 c formed in the case cover 35 so that the gasket 70 is in the case. It is installed on the upper surface of the cover 35.

  A ring-shaped first lip portion 72 is formed on the upper surface of the gasket 70, and a ring-shaped second lip portion 73 erected upward on the outer peripheral side of the first lip portion 72. Is formed. The first and second lip portions 72 and 73 are formed to be inclined toward the outer peripheral side so that the distal end portions are located on the outer peripheral side with respect to the base end portion. Therefore, when the element assembly 3 is attached to the filter head 2 as described above, the tip ends of the first and second lip portions 72 and 73 come into contact with the third seal surface 10b of the body 10 and the upper surface of the gasket 70 Elastically deforms in a direction approaching. As a result, the gasket 70 provides a seal between the body 10 and the case cover 35, and prevents foreign matter and water from entering from the outside.

  The filtration of hydraulic oil by the oil filter 1 configured as described above will be briefly described. The hydraulic oil to be filtered is sent from the inlet port 11 into the first passage 12 and flows into the first space 81 through the outer passage 22 as indicated by an arrow IN in FIG. Then, it is filtered from the first space 81 through the filter medium 54 and flows into the second space 82. The hydraulic oil that has flowed into the second space 82 is sent out from the outlet port 13 through the inner passage 24 and the second passage 14 as indicated by an arrow OUT. In this case, when the filter medium 54 is clogged and the differential pressure P between the hydraulic oil before and after passing through the filter medium becomes equal to or higher than a predetermined pressure Pa, the relief valve 18 opens the bypass passage 15a.

  When the hydraulic oil is filtered as described above, the hydraulic pressure of the hydraulic oil in the element case 30 acts in a direction to push the element case 30 downward and away from the filter head 2. This force acts on the screw coupling portion, but in this embodiment, both the passage flowing into the element case 30 (the outer passage 22) and the passage flowing out from the element case 30 (the inner passage 24). Since the passage is provided on the inner diameter side of the screw coupling portion, the effective diameter of the screw portion can be increased. For this reason, it is possible to sufficiently increase the strength of the screw coupling portion, and it can be used even in an environment where the hydraulic pressure is high. Further, since the first seal ring 61 and the contact portion by the first seal surface 10a and the second seal surface 35a are provided on the outer peripheral side of the screw coupling portion, the hydraulic pressure in the element case 30 becomes high. However, it is possible to prevent the hydraulic oil from leaking outside.

  By the way, when the working hydraulic pressure is further increased, the force acting in the direction of pushing the element case 30 downward and moving it away from the filter head 2 increases, so that there is a slight gap between the first seal surface 10a and the second seal surface 35a. May occur. At that time, if foreign matter such as mud and dust enters the gap from the outside, the force acting on the screw coupling portion remains without being released even if the hydraulic pressure in the element case 30 is sufficiently reduced. In order to remove the case 30 from the filter head 2, a larger torque than usual is required. However, in the oil filter 1 according to the present invention, the gasket 70 is provided on the outer peripheral side with respect to the contact portion formed by the first and second seal surfaces 10a, 35a. Water can be prevented from entering. Therefore, when the working hydraulic pressure in the element case 30 is sufficiently reduced, the force acting on the screw coupling portion is released, so that the element case 30 can be detached from the filter head 2 with a normal torque. . In addition, since water can be prevented from entering, corrosion of the screw coupling portion and the like can be prevented.

  In addition, as described above, the gasket 70 is formed using an elastic material such as rubber, and has the first and second lip portions 72 and 73 standing upward. The element case 30 can be attached to the filter head 2 with low torque while maintaining the sealing performance due to the crushing allowance. In addition, since the gasket 70 includes a plurality of lip portions of the first lip portion 72 and the second lip portion 73, the sealing performance can be further improved without increasing the mounting torque so much. it can.

  In the above embodiment, the gasket 70 has two lip portions, the first and second lip portions 72 and 73. However, the gasket 70 has one or three or more lip portions. It may be configured. Moreover, you may comprise a gasket, without providing a lip | rip part, The embodiment is demonstrated below with reference to FIG. 5 and FIG.

  In the oil filter 100, the gasket is configured without a lip portion, and the lower surface shape of the filter head and the shape of the case cover are different from the oil filter 1 described above, and the first seal ring 61 is formed from the screw coupling portion. In addition to being provided on the inner side, a contact portion by the seal surface is also provided on the inner side of the screw coupling portion. In the following description, parts having functions similar to those of the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the filter head 2 in the oil filter 100, a fourth seal surface 136b and a first seal ring 61 formed on a case cover 135, which will be described later, are in contact with the outer peripheral surface of the outer cylindrical portion 21 below the male screw 21a. A sealing surface 21b is formed. A first seal surface 10 a that contacts a second seal surface 135 a formed on the upper surface of the case cover 135 is formed on the lower surface of the body 10 on the outer peripheral side of the outer cylindrical portion 21. Further, a third seal surface 10b that comes into contact with a gasket 170 described later is formed on the lower surface of the body 10 on the outer peripheral side from the first seal surface 10a.

  The element assembly 3 in the oil filter 100 includes an element case 130 and a filter element 50 inserted and held in the element case 130. The element case 130 includes a case body 31 and a case cover 135 attached to cover the upper end opening of the case body 31.

  The case cover 135 is made of a metal material in the same manner as the filter head 2, and a through hole 136 penetrating vertically is formed at the center thereof. A female screw 136a is formed to be screwed with the male screw 21a. For this reason, the element assembly 3 can be attached to the filter head 2 while rotating the element assembly 3 such that the female screw 136 a is screwed with the male screw 21 a of the outer cylindrical portion 21. A fifth seal surface 136b is formed on the inner peripheral surface of the through hole 136 below the female screw 136a so as to come into contact with the fourth seal surface 21b formed in the outer cylindrical portion 21. Further, a seal ring groove 136c is formed on the inner peripheral surface of the through hole 136 below the fifth seal surface 136b, and the first seal ring 61 is disposed in the seal ring groove 136c.

  On the upper surface of the case cover 135, a second seal surface 135 a is formed that contacts the first seal surface 10 a formed on the lower surface of the filter head 2 (body 10). Further, a ring-shaped concave groove 135c is formed on the upper surface of the case cover 135 on the outer peripheral side from the second seal surface 135a, and a gasket 170 described later is disposed in the concave groove 135c.

  A ring-shaped groove 138 is formed on the outer peripheral surface of the case cover 135. After the case cover 135 is inserted into the upper end opening of the case main body 31, the upper end portion of the case main body 31 is press-formed inward. It enters into the ring-shaped groove 138. Thereby, the case cover 135 is firmly coupled to the upper end portion of the case main body 31. A second seal ring 62 that seals the coupling portion is installed in a seal ring groove formed below the ring-shaped groove 138 and is covered with the case body 31. A plurality of guide portions 140 projecting downward are provided on the outer periphery of the lower end of the case cover 135. A stepped portion is formed on the inner peripheral portion of each guide portion 140, and the upper end outer peripheral portion of the filter element 50 is supported by the stepped portion.

  The gasket 170 is for preventing foreign matter such as mud and dust and water from entering between the filter head 2 (body 10) and the case cover 135 from the outside, and is formed in a ring shape using an elastic material such as rubber. And are provided on the outer peripheral side of the screw coupling portion formed by the male screw 21a and the female screw 136a and the contact portion formed by each sealing surface. As shown in FIG. 6, a gasket 170 is installed in a concave groove 135 c formed on the upper surface of the case cover 135. When the element assembly 3 is attached to the filter head 2, the upper surface of the gasket 170 abuts against the third seal surface 10 b of the body 10 to seal between the body 10 and the case cover 135, and foreign matter enters from the outside. It comes to prevent.

  Also in the oil filter 100 configured as described above, both the passage (outer passage 22) that flows into the element case 130 and the passage (inner passage 24) that flows out from the element case 130, like the oil filter 1 described above. Is provided on the inner diameter side of the screw coupling portion, the effective diameter of the screw portion can be increased. For this reason, it is possible to sufficiently increase the strength of the screw coupling portion, and it can be used even in an environment where the hydraulic pressure is high. Further, the first seal ring 61 and the contact portion by the fourth seal surface 21b and the fifth seal surface 136b are provided inside the screw coupling portion, and further, the first seal surface 10a is disposed outside the screw coupling portion. Since the contact portion with the second seal surface 135a is provided, the hydraulic oil can be prevented from leaking to the outside even when the hydraulic pressure in the element case 130 becomes high.

  In addition, the operating hydraulic pressure becomes higher and the force acting in the direction of pushing the element case 130 downward and moving away from the filter head 2 increases, and a slight gap is generated between the first seal surface 10a and the second seal surface 135a. Even in this case, since the gasket 170 is provided on the outer peripheral side with respect to the contact portion formed by the first and second seal surfaces 10a and 35a, foreign matter and water can enter from between the seal surfaces from the outside. Can be prevented. Therefore, when the working hydraulic pressure in the element case 130 is sufficiently reduced, the force acting on the screw coupling portion is released, so that the element case 130 can be detached from the filter head 2 with a normal magnitude torque. . In addition, since water can be prevented from entering, corrosion of the screw coupling portion and the like can be prevented.

  In the above-described embodiment, an example in which the filter head is configured integrally is shown. However, the outer cylindrical portion may be manufactured separately from the body, and the filter head may be configured by screwing them together. . In this way, the body can be easily cast and machined, and the filter head can be easily manufactured.

DESCRIPTION OF SYMBOLS 1 Oil filter (spin-on filter) 2 Filter head 3 Element assembly 10 Body 21 Outer cylindrical part (projection connection part) 21a Male screw 30 Element case (case) 31 Case main body 35 Case cover (cover member) 36 Through-hole 36a Female screw 50 Filter element 70 Gasket (seal member) 72 First lip portion 73 Second lip portion

Claims (9)

A spin-on filter having a filter head and an element assembly that is built in a case and is screwed into the filter head;
The case includes a case main body having an upper end opened and a lower end closed, and a cover member attached to the case main body so as to cover the upper end opening. The filter element is incorporated in the case main body. The element assembly is configured by attaching the cover member in a state,
The filter head is provided with a projecting connecting portion formed in a cylindrical shape, a male screw is formed on the outer peripheral surface of the projecting connecting portion, and a through-hole penetrating vertically is formed in the cover member. A female screw is formed in the hole, the male screw and the female screw are screwed together, and the element assembly can be removably attached to the filter head,
When the element assembly is attached to the filter head, the filter head and the cover member are in surface contact with each other to seal a space between the filter head and the cover member;
It is provided so as to be sandwiched between the filter head and the cover member outside the screw coupling portion and the surface contact portion, and prevents foreign matter from entering the screw coupling portion and the surface contact portion from the outside. A spin-on filter comprising a seal member.   The seal member is formed using an elastic material, and has a lip portion that is formed upright toward the filter head, and the lip portion is elastically deformed in contact with the filter head. The spin-on filter according to claim 1, wherein the spin-on filter is sandwiched between a filter head and the cover member.   3. The spin-on filter according to claim 2, wherein in the sealing member, the lip portion is formed to be inclined outward so that a tip end portion thereof is located outside a base end portion.   The spin-on filter according to claim 2 or 3, wherein the seal member includes a plurality of the lip portions.   The spin-on filter according to claim 1, wherein the seal member is fixed to the cover member and configured integrally with the element assembly. A case main body having an upper end opened and a lower end closed, a filter element inserted and held in the case main body for filtering a fluid flowing through the case main body, and the filter element disposed in the case main body An element assembly having a cover member attached to the upper end of the case body so as to cover the opening,
The cover member is formed with a through-hole penetrating vertically, and a female screw is formed in the through-hole. The female screw is screwed to a male screw formed on the filter head, and the element assembly is attached to the filter head. So that the cover member comes into surface contact with the filter head and seals the space between the cover member and the filter head when attached to the filter head. Composed of
Provided on the cover member outside the portion in surface contact with the female screw and the filter head, and sandwiched between the cover member and the filter head when the element assembly is attached to the filter head A spin-on filter element assembly comprising a seal member that prevents foreign matter from entering the screw coupling portion and the surface contact portion from the outside.   The seal member is formed using an elastic material, and has a lip portion that is erected upward. When the element assembly is attached to the filter head, the lip portion is the filter. 7. The element assembly for a spin-on filter according to claim 6, wherein the element assembly is sandwiched between the filter head and the cover member in a state of being elastically deformed in contact with the head.   8. The element assembly for a spin-on filter according to claim 7, wherein in the sealing member, the lip portion is formed to be inclined outward so that a tip end portion thereof is located outside a base end portion.   The element assembly for a spin-on filter according to claim 7 or 8, wherein the seal member includes a plurality of the lip portions.

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