JP4389669B2 - Element exchange type filter - Google Patents

Description

  The present invention relates to an element exchange type filter capable of exchanging elements.

  As an example of an element exchange type filter, an element exchange type oil filter for filtering lubricating oil of an internal combustion engine will be described. In this element exchange type oil filter, an element exchange type oil filter provided with a mechanism for discharging lubricating oil stored in the casing in advance when the element inside the casing is exchanged is disclosed in Patent Document 1 below. ing.

  According to the oil drain method disclosed in Patent Document 1, grooves extending in the axial length direction are formed in the respective screw regions of the oil filter cap and the oil filter case. When the oil filter cap that has been loosened several times at the time of oil replacement is set to a predetermined position, a drain passage (oil drain) for draining oil is formed by arranging the two grooves facing each other. The discharged lubricating oil can be discharged to the outside.

  Here, conventionally, since the oil filter cap was made of aluminum, the base material strength of the oil filter cap was sufficient even when a groove that crosses all the screws was formed in the screw region. Even after the oil filter cap was tightened to the oil filter case with a predetermined axial force, the screw strength was sufficient, and the phenomenon that the oil filter cap loosened gradually based on the internal pressure (creep phenomenon) did not occur.

However, in recent years, there has been a demand for lighter element-exchangeable filters, and it has been studied to change the oil filter cap from aluminum to resin. If the oil filter cap is changed to resin and a groove that crosses all the screws is formed in the screw area, the thread will be divided, so that it is possible to obtain integrated strength as a whole screw area. This is not possible, and it is considered that the screw strength is insufficient. If the screw strength is insufficient, after tightening the oil filter cap to the oil filter case with the specified axial force, the oil filter cap gradually loosens against the oil filter case due to the creep phenomenon, and the lubricating oil leaks from the inside. Can be considered.
Japanese Patent Laid-Open No. 10-202015

  The problem to be solved by the present invention is that, in the element exchange type filter, when a groove for forming a discharge passage is formed in each screw region of the filter cap and the filter case, the filter is separated from the filter case. The cap may be loosened. Therefore, the present invention has a structure in which the filter cap does not loosen with respect to the filter case even when a groove for forming the discharge passage is formed in each screw region of the filter cap and the filter case. It is to provide an element exchange type filter.

  In the element exchange type filter according to the present invention, the liquid is introduced into the casing, the liquid introduced into the casing is filtered by the element accommodated therein, and the filtered liquid is led out of the casing. In the element exchange type filter, the casing has a bottomed cylindrical shape, and a male screw region in which a male screw is engraved from the front end side to the bottom side is provided on an outer peripheral surface thereof. 1 casing and a 2nd casing which consists of a bottomed cylindrical shape and the internal peripheral surface is provided with the internal thread area | region in which the internal thread which can be screwed together with the external thread provided in the said 1st casing is engraved And have.

  The male screw region has a substantially linear first liquid escape region extending in the axial length direction from the distal end side. The first liquid escape region includes a groove forming region crossing the male screw, and a bottom side. A screw remaining region that does not cross the male screw, and the female screw region has a substantially linear second liquid relief region extending in the axial length direction from the bottom side, and the second liquid relief region is When the first casing and the second casing are rotated in a direction that separates the first casing and the second casing from a state where the first casing and the second casing are screwed to the maximum, including a groove forming region that crosses the female screw, A discharge passage for discharging the liquid stored in the casing to the outside is formed at a position where the first oil relief groove and the second oil relief groove are arranged to face each other.

  According to another aspect of the invention, the screw remaining region is configured by a region where at least one peak closest to the bottom side is left in the male screw of the male screw region. Further, the male screw remaining in the screw remaining region leaves the base side of the male screw, and a groove is formed on the tip side.

  In another form of the invention, the second liquid escape region of the second casing includes a remaining screw region that does not cross the female screw on the tip side. In addition, a receding region directed inward in the radial direction is provided at a predetermined position of the groove forming region of the first casing.

  According to the element exchange type filter having the above configuration, the first liquid relief region provided in the first casing includes a groove forming region that crosses the male screw and a screw remaining region that does not cross the male screw on the bottom side. . As a result, in the male screw region on the bottom side of the first casing, there is a remaining screw region, so that the male screw continues, and the strength of the male screw on the bottom side of the first casing can be improved.

  In general, when tightening a screw, it is known that about 80 to 90% of the tightening axial force is borne by a screw thread formed at the base (bottom side) of the male screw region. Therefore, in the present invention, for example, by configuring the male screw of the male screw region as a screw remaining region from a region that leaves at least one mountain closest to the bottom side, the strength of the male screw on the bottom side can be improved. This makes it possible to obtain the function of locking the screws.

  As a result, for example, when the first casing is made of resin, it is possible to prevent the creep phenomenon from occurring in the screw region and to prevent the first casing from loosening with respect to the second casing. It becomes. Thereby, the lubricating oil does not leak from the inside, and the reliability of the element exchange type filter can be maintained.

  Further, according to another embodiment, the male screw remaining in the screw remaining region is discharged in the groove on the distal end side by forming a shape in which the base side of the male screw remains and a groove is formed on the distal end side. While it is possible to form a passage, it avoids the division of the male screw on the base side of the male screw, thereby contributing to an increase in the strength of the male screw and ensuring the function of locking the screw. It is possible.

  According to another embodiment, the screw engagement area between the female screw and the male screw at the root (bottom side) of the male screw region is also formed in the second liquid escape region of the second casing. Is enlarged, and the function of locking the screw can be further expanded. In addition, when the first casing is rotated and loosened with respect to the second casing, the remaining screw area provided in the second liquid escape area of the second casing faces the recess of the groove forming area of the first casing. Thus, a predetermined space is secured between the recess and the remaining screw region, and the internal oil can be discharged to the outside.

  Hereinafter, the structure of an element exchange type filter in each embodiment based on the present invention will be described with reference to the drawings. In each embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description will not be repeated.

(Embodiment 1)
First, the structure of an element exchange filter 1A according to Embodiment 1 based on the present invention will be described with reference to FIGS. FIG. 1 is an overall perspective view showing the structure of an oil filter cap 10 used in the element exchange type filter 1A in the present embodiment, and FIG. 2 is used in the element exchange type filter 1A in the present embodiment. FIG. 3 is an overall perspective view showing the structure of the oil filter case 20, FIG. 3 is a partially enlarged sectional view showing the structure of the element exchange type filter 1A in the present embodiment, and FIG. A state in which the filter cap 10 is most tightened is shown, and (b) shows a state in which the oil filter cap 10 is loosened to form an oil relief region. FIG. 4 is a schematic diagram showing an arrangement pattern of remaining screw areas provided in an oil relief area provided in the oil filter cap 10.

  Element exchange type filter 1A in the present embodiment introduces lubricating oil as a liquid for lubricating the inside of the internal combustion engine into the casing, and filters the lubricating oil introduced into the casing with the oil element accommodated therein. The oil filter has a configuration in which the filtered lubricating oil is led out of the casing, and the oil element inside the casing is periodically replaced. The casing is composed of an oil filter cap 10 as a first casing and an oil filter case 20 as a second casing.

(Structure of oil filter cap 10)
Referring to FIG. 1, an oil filter cap 10 includes a cylindrical main body portion 11 having a bottomed cylindrical shape, and a head portion 12 provided in a region located at the bottom portion of the cylindrical main body portion 11. Yes. The oil filter cap 10 is made of a resin material. On the head 12 side of the outer peripheral surface of the cylindrical main body 11, a ring-shaped convex wall 7 is provided. In addition, a male screw region 100 in which a male screw 13 is engraved is provided on the outer peripheral surface of the cylindrical main body 11 from the tip side toward the head 12 side.

  The male screw region 100 is provided with two substantially linear oil relief regions 100A and 100B extending in the axial direction from the tip side as liquid escape regions. The first oil relief regions 100 </ b> A and 100 </ b> B are provided on the outer peripheral surface of the cylindrical main body 11 at positions facing each other by 180 °. The first oil relief regions 100A and 100B include a groove forming region 101 in which a groove having a predetermined width is formed so as to cross the male screw 13 from the tip side, and the male screw 13 without crossing the male screw 13 on the head 12 side. Includes a remaining screw region 102 continuously present. In the present embodiment, the remaining screw region 102 is composed of a region in which a single screw portion closest to the head 12 side remains. Therefore, for the single thread closest to the head 12 side, the thread is connected all around. It should be noted that not only a single thread, but also a double thread or several threads closest to the head 12 side is not provided with a groove, and a remaining screw region 102 is formed. Can be connected.

(Structure of oil filter case 20)
Next, referring to FIG. 2, the oil filter case 20 includes a cylindrical main body 21 having a bottomed cylindrical shape, and a bottom 22 provided in a region located at the bottom of the cylindrical main body 21. is doing. The oil filter case 20 is made of aluminum, a resin material, or the like. A female screw region 200 in which a female screw 23 that can be screwed into the male screw 13 provided in the oil filter cap 10 is provided on the inner peripheral surface of the cylindrical main body 21.

  The female screw region 200 is provided with two substantially linear second oil relief regions 200A and 200B extending in the axial length direction from the bottom 22 side as liquid escape regions. The second oil relief regions 200 </ b> A and 200 </ b> B are provided on the inner peripheral surface of the cylindrical main body 21 at positions facing each other by 180 °. The second oil relief regions 200A and 200B include a groove forming region 201 in which a groove having a predetermined width is formed so as to cross the female screw 23 as a whole.

  Next, with reference to FIG. 3A, a state in which the oil filter cap 10 is most tightened to the oil filter case 20 in a state where the oil element 50 is housed therein is shown. An O-ring 70 is provided in a recessed area formed between the protruding wall 7 and the head 12 side to keep the inside in a confidential state.

  Generally, when tightening a screw, it is known that 80 to 90% of the tightening axial force is borne by a screw thread formed at the root of the male screw region. Therefore, in the oil filter cap 10 according to the present embodiment, since the screw thread remaining region 102 exists in the male screw region 100 on the head 12 side (bottom side) of the oil filter cap 10, the male screw 13 is Since it is continuous without being divided, the strength of the thread formed at the root of the male screw region can be improved. As a result, it is possible to obtain a screw locking function.

(Action / Effect)
As described above, according to the element exchange type filter 1A in the present embodiment, by providing the remaining screw region 102 in the groove forming region 101 provided in the oil filter cap 10, it is possible to obtain the function of preventing screw loosening. Therefore, the state in which the oil filter cap 10 is fastened to the oil filter case 20 is stably maintained, and the oil filter cap 10 can be prevented from being loosened with respect to the oil filter case 20. Thereby, the lubricating oil does not leak from the inside, and the reliability of the element exchange type filter 1A can be maintained.

  On the other hand, from the state in which the oil filter cap 10 and the oil filter case 20 are screwed to the maximum (the state shown in FIG. 3A), the oil filter cap 10 and the oil filter case 20 are separated by loosening the screws. When the first oil relief grooves 100A and 100B and the second oil relief grooves 200A and 200B are arranged to face each other (the state shown in FIG. 3B), the first oil relief grooves A space defined by facing the grooves 100A and 100B and the second oil relief grooves 200A and 200B forms a discharge passage for discharging the lubricating oil stored in the casing to the outside.

  In the present embodiment, as shown in FIG. 4A, the oil filter cap 10 is provided with two first oil relief regions 100A and 100B, and a screw remaining region 102 is provided in each region. As described above, as shown in FIG. 4B, the screw remaining region 102 is provided only in one first oil relief region 100A, and the screw remaining region 102 is not provided in the other first oil relief region 100B. It is also possible to adopt a configuration in which all the male screws 13 in the male screw region 100 are crossed.

(Embodiment 2)
Next, the structure of element exchange type filter 1B in Embodiment 2 based on this invention is demonstrated with reference to FIGS. FIG. 5 is a partially enlarged perspective view showing the structure of the oil filter cap 10 used in the element exchange filter 1B in the present embodiment, and FIG. 6 shows the structure of the element exchange filter 1B in the present embodiment. FIG. 7 is a schematic view showing an arrangement pattern of screw remaining areas provided in an oil relief area provided in the oil filter cap 10.

  The element exchange type filter 1 in the present embodiment is characterized by the structure of the oil filter cap 10. In the first embodiment, all the threads of the male screw 13 are left as the remaining screw region 102. However, as shown in FIG. A groove having a predetermined width similar to that of the oil relief region 101 is formed on the distal end side while the base side is left.

(Action / Effect)
As described above, the element exchange filter 1 according to the present embodiment can provide the same effects as the element exchange filter according to the first embodiment. Furthermore, as shown in FIG. 6, since it is possible to form a discharge passage with a groove on the tip side, the male screw is prevented from being divided on the base side of the male screw 13, so that the male screw strength is increased. It is also possible to secure the function of preventing the screws from loosening.

  In the present embodiment as well, as in the case of the first embodiment, the screw remaining region 102A is not only the region where the one screw thread closest to the head 12 side is left, but also the head 12 It is also possible to provide the remaining screw region 102A without providing a groove in the two or several threads closest to the side. Further, as shown in FIG. 7A, from the viewpoint of workability of the oil drain, two first oil relief regions 100A and 100B are provided in the oil filter cap 10, and a screw remaining region 102A is provided in each region. In addition, as shown in FIG. 7B, the screw remaining region 102A is provided only in one first oil relief region 100A, and the screw remaining region 102A is not provided in the other first oil relief region 100B. It is also possible to adopt a configuration in which all the male screws 13 in the male screw region 100 are crossed.

(Embodiment 3)
Next, the structure of element exchange filter 1C according to Embodiment 3 based on the present invention will be described with reference to FIGS. FIG. 8 is a first partial enlarged cross-sectional view showing the structure of the element replaceable filter 1 in the present embodiment, and FIG. 9 is a second view showing the structure of the element replaceable filter 1C in the present embodiment. FIG.

  In the element exchange type filter 1 according to the present embodiment, a groove forming region 201 in which a groove is formed so as to cross the female screw 23 from the bottom 22 also in one second oil relief region 200A of the oil filter case 20; The distal end side does not cross the female screw 23 and includes a screw remaining region 202 where the female screw 23 continuously exists. Whether the other second oil relief region 200B is left as it is or a configuration in which the screw remaining region 202 is similarly provided is appropriately selected. Further, a recessed portion 103 is provided at a predetermined position of the groove forming region 101 of the oil filter cap 10 as a retracted region toward the inner side in the radial direction of the cylindrical main body 11. The receding region may be a groove extending not only to a partial recess but also to the tip end side of the cylindrical main body 11.

(Action / Effect)
As described above, also by the element exchange filter 1C in the present embodiment, the same effects as those of the element exchange filter 1A in the first embodiment can be obtained. Furthermore, in the present embodiment, the screw remaining area is provided in the oil relief area of both the oil filter cap 10 and the oil filter case 20, so that the screw strength is improved and the loosening prevention effect is further enhanced. Can do. In addition, when the oil filter cap 10 is loosened with respect to the oil filter case 20, the discharge passage defined by the space where the first oil relief groove 100A and the second oil relief groove 200A are opposed to each other is the second oil relief region 200A. 9, the recess 103 is provided at a position facing the remaining screw region 202 in a state where the screw remaining region 202 is opposed to the recess 103, as shown in FIG. A predetermined space is ensured between the screw remaining area 202 and the internal oil can be discharged to the outside.

  In the above embodiment, the oil relief groove is provided at a position opposed to 180 ° so that two discharge passages can be formed. However, the oil filter cap 10 and the oil filter case 20 It is also possible to employ a configuration in which oil relief grooves are provided one by one, or a configuration in which three or more oil relief grooves are provided.

  Moreover, although the case where this invention is applied to the element exchange type filter for filtering the lubricating oil which lubricates the inside of an internal combustion engine was described, it has the same mechanism and is a filter which filters the foreign material which exists in a liquid. In contrast, the present invention can be applied.

  Accordingly, the above-described embodiment disclosed herein is illustrative in all respects and does not serve as a basis for limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. Further, all modifications within the meaning and scope equivalent to the scope of the claims are included.

It is a whole perspective view which shows the structure of the oil filter cap used for the element exchange type filter in Embodiment 1 based on this invention. It is a whole perspective view which shows the structure of the oil filter case used for the element exchange type filter in Embodiment 1 based on this invention. It is a partial expanded sectional view which shows the structure of the element exchange type filter in Embodiment 1 based on this invention. It is a schematic diagram which shows the arrangement pattern of the screw residual area | region provided in the oil relief area | region provided in the oil filter cap in Embodiment 1 based on this invention. It is a partial expansion perspective view which shows the structure of the oil filter cap used for the element exchange type filter in Embodiment 2 based on this invention. It is a partial expanded sectional view which shows the structure of the element exchange type filter in Embodiment 2 based on this invention. It is a schematic diagram which shows the arrangement pattern of the screw residual area | region provided in the oil relief area | region provided in the oil filter cap in Embodiment 2 based on this invention. FIG. 6 is a first partial enlarged cross-sectional view showing a structure of an element exchange type filter in a third embodiment. FIG. 10 is a second partial enlarged cross-sectional view showing the structure of the element exchange type filter in the third embodiment.

Explanation of symbols

  1A, 1B, 1C Element exchange type filter, 7 convex wall, 10 oil filter cap, 11 cylindrical main body, 12 head, 13 male screw, 20 oil filter case, 21 cylindrical main body, 22 bottom, 23 female Screw, 50 Oil element, 70 O-ring, 100 Male thread area, 100A, 100B First oil relief area, 101 Groove formation area, 102, 102A Screw remaining area, 103 Recess, 200 Female thread area, 200A, 200B Second oil Relief area, 201 groove forming area, 202 screw remaining area.

Claims (5)

An element exchange type filter that introduces liquid into the casing, filters the liquid introduced into the casing by an element accommodated therein, and leads the filtered liquid to the outside of the casing,
The casing is
A first casing having a cylindrical shape with a bottom, and provided with a male screw region in which a male screw is engraved from the tip side toward the bottom side on the outer peripheral surface;
A second casing having a cylindrical shape with a bottom and provided with a female screw region in which a female screw capable of being screwed into a male screw provided in the first casing is provided on an inner peripheral surface thereof. And
The male screw region has a substantially linear first liquid escape region extending in the axial length direction from the distal end side, and the first liquid escape region includes a groove forming region across the male screw and the bottom side. Including a remaining screw area that does not cross the male thread,
The female screw region has a substantially linear second liquid escape region extending in the axial length direction from the bottom side thereof, and the second liquid escape region includes a groove forming region crossing the female screw,
When the first casing and the second casing are rotated in the direction in which the first casing and the second casing are separated from the state in which the first casing and the second casing are screwed to the maximum, the first oil relief groove and the second casing An element exchange type filter in which a discharge passage for discharging the liquid stored in the casing to the outside is formed at a position where the oil escape groove is opposed to the oil release groove. The screw remaining area is
2. The element exchange type filter according to claim 1, wherein the male screw in the male screw region is composed of a region where at least one peak closest to the bottom side is left.   The element exchange type filter according to claim 2, wherein the male screw remaining in the screw remaining region has a base portion side of the male screw remaining and a groove is formed on a tip end side.   The element exchange type filter according to any one of claims 1 to 3, wherein the second liquid escape region of the second casing includes a screw remaining region that does not cross the female screw on the tip end side.   The element exchange type filter according to claim 4, wherein a receding region directed inward in the radial direction is provided at a predetermined position of the groove forming region of the first casing.

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