JP3040305B2 - filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter and, more particularly, to a filter in which a casing and an end plate are integrated via a fastening member so that a filter medium can be replaced.

[0002]

2. Description of the Related Art Conventionally, there is a filter in which a filter medium can be replaced in various filters.
Is disclosed in Japanese Unexamined Patent Application Publication No. 2000-205,878. In a filter having such a structure, a bottomed cylindrical casing for accommodating a filter medium, a lid member for closing an opening of the casing so as to be able to communicate between the inside and the outside of the casing (a member for coupling a pipe joint), and the lid member An annular fastener is provided which is prevented from coming off by an enlarged diameter portion (outward flange portion) provided at an opening of the casing to integrate the casing and the casing and is screwed to the lid member.

[0003] In the above-described structure, an O-ring or the like for providing a liquid-tight state is interposed between the casing opening and the lid member. However, there is a possibility that oil leakage may occur due to a sealing failure due to some cause such as an O-ring mounting failure. However, it is difficult to easily confirm the sealing failure with the above-mentioned conventional filter medium exchange type filter. there were.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, a main object of the present invention is to provide a filter capable of easily detecting a liquid leak due to a defective seal.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a casing having a bottomed cylindrical body for containing a filter medium and an enlarged diameter portion provided at an opening of the body. When,
An end plate having an inlet / outlet into the casing, covering the opening, and having an external thread portion having a larger diameter than the enlarged diameter portion; a ring nut portion screwable to the external thread portion; and the enlarged diameter portion An annular fastener provided with an inward flange portion formed at an axial end of the ring nut portion so as to be able to abut the ring nut portion, and provided between the casing and the radially inner portion of the end plate with respect to the male screw portion. And the ring nut portion is screwed to the male screw portion while the inward flange portion is in contact with the enlarged diameter portion to integrate the casing and the end plate. An engagement formed at the axial end of the enlarged diameter portion of the casing so as to extend toward the male thread portion so as to relatively prevent the casing and the end plate from rotating. A projecting piece and the engaging projecting piece An engaging recess formed on the outer peripheral surface of the male screw portion so as to be receivably opened on the casing side at both ends in the axial direction of the male screw portion and reaching the middle portion in the axial direction, wherein the male screw portion has A liquid flow passage is provided that opens on opposite sides of the axial direction of the male screw portion from the casing side and communicates with the engaging recess and is narrower in the circumferential direction of the male screw portion than the engaging recess. This is achieved by providing a filter characterized in that: Further, a casing having a bottomed cylindrical body for containing the filter medium and an enlarged diameter portion provided at an opening of the body, and an outlet having an outlet into the casing to cover the opening. An end plate having a male screw portion having a larger diameter than the enlarged diameter portion, a ring nut portion that can be screwed to the male screw portion, and an axial end portion of the ring nut portion formed to be able to abut the enlarged diameter portion. An annular fastener having an inward flange portion, and sealing means provided between the casing and the radially inner portion of the end plate with respect to the male screw portion. A filter in which the casing and the end plate are integrated by screwing the ring nut portion to the male screw portion while contacting the portion, wherein the filter is provided between the enlarged diameter portion and the inward flange portion. A fluid passage is provided in the On the outer surface of the Jo fasteners,
A protruding tool engagement protrusion for screwing the ring nut portion to the male screw portion is provided, and a fluid penetrates the annular fastener so as to communicate between the inside and the outside via the tool engagement protrusion. Preferably, a passage is provided.

[0006]

With this structure, in order to make the filter medium replaceable, in the filter in which the casing and the end plate covering the opening thereof are connected via the annular fastener, the casing and the end plate are structurally structured. In the event that liquid leakage occurs due to improper installation of the sealing means provided between the first and second seals, the leaked liquid easily flows out through the fluid passage, so that the operation for confirming the defective sealing can be performed quickly and easily. .

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

FIG. 1 is a longitudinal sectional view showing an automotive engine oil filter to which the present invention is applied. In the figure, a cylindrical filter medium 2 is accommodated coaxially in a bottomed cylindrical casing 1, and an end covering the opening is provided at an open end of a lower end of the casing 1 in the figure. A set plate 3 as a plate is connected to the casing 1 by an annular fastener 4 surrounding the casing 1.

The set plate 3 is provided at its center with a through screw hole 3a which is screwed to a pipe joint projecting from a cylinder block (not shown). A plurality of communication holes are provided in a portion surrounding the through screw hole 3a. 3b is provided. The engine oil enters the cylindrical filter paper of the filter medium 2 from the cylinder block side through the communication hole 3b, and flows out into the cylindrical hole through a number of holes provided in the cylindrical partition on the inner peripheral side thereof.
It is returned to the cylinder block via the through screw hole 3a. An annular dish-shaped valve 5 is provided on the filter medium 2 side of the set plate 3 as a reed valve for preventing backflow through the communication hole 3b in the casing 1.

A relief valve 6 is provided near the bottom of the casing 1 in the cylindrical hole of the filter medium 2 to release a rise in oil pressure when the filter paper clogs to an allowable value or more. In addition, between the filter medium 2 and the bottom surface of the casing 1 (above in the figure), a check made of a leaf spring for elastically holding the filter medium 2 between the set plate 3 and the bottom surface of the casing 1 A spring 7 is interposed.

The casing 1 includes a body 8 for accommodating the filter medium 2.
And an enlarged diameter portion 9 formed on the opening end side of the body portion 8, and the enlarged diameter portion 9 is formed by bending the cross-sectional shape of the body portion 8 into a crank shape. An O-ring 11 is sandwiched between the axially inner end surface of the outer peripheral portion of the set plate 3 and the opposite end surface of the enlarged diameter portion 9. Further, the outer diameter of the set plate 3 is set to be slightly larger than the outer diameter of the enlarged diameter portion 9, so that the abutting amount between the set plate 3 and the enlarged diameter portion 9 can be made constant. Can be made constant. In addition,
An O-ring guide body 12 having an annular band is fixed to the inner peripheral surface of the body 8 in the vicinity of the open end thereof so as to position the inner peripheral side of the O-ring 11.

The annular fastener 4 is formed in an inverted L-shaped cross section so as to cover the outer surface of the enlarged diameter portion 9, and a ring surrounding the externally threaded portion 3 c formed on the outer peripheral surface of the set plate 3. It has a nut portion 4a and an inward flange portion 4b extending radially inward from the axial end of the ring nut portion 4a and formed near the outer peripheral surface of the body portion 8.
On the inner peripheral surface of the ring nut 4a, the male screw 3
The female screw part 4c screwed with c is formed.

As shown in FIG. 2, a ring packing 15 is mounted on an end face of the set plate 3 on the engine mounting side in an annular groove 14 defined by concentric large and small annular ribs 13a and 13b. I have. Between the large annular rib 13a and the outermost outer wall 13c of the set plate 3, radial ribs 16 are formed at a plurality of positions (six in the embodiment) so as to connect the two annular ribs 13a and 13c to each other. ing. The set plate 3 is provided with a radial rib 2 at a position between the peripheral wall of the through screw hole 3a and the annular rib 13a and separating each communication hole 3b in the circumferential direction.
8, the rigidity around the through screw holes 3a and the communication holes 3b of the set plate 3 can be increased.

As shown in FIG. 3, the male screw portion 3c of the set plate 3 is provided with detent grooves 17 at equal angular pitches, for example, at three places. The detent groove 17 is opened to the axially inner end face on the casing 1 side when the set plate 3 is assembled, and is cut in the opposite outer end face direction to a middle portion in the axial direction.
An engaging tongue piece 9 b extending in the axial direction to engage with the detent groove 17 at the time of assembly is provided on an end edge of the enlarged diameter portion 9 of the casing 1.
Are provided at corresponding positions.

In the filter thus constructed, the filter medium 2 is accommodated in the casing 1 and the detent groove 1 is provided.
While engaging the engaging tongue piece 9b with the engaging tongue piece 9b to prevent the set plate 3 and the casing 1 from rotating with each other, the annular fastener 4 is fitted from the body portion 8 side and the male screw portion 3c of the set plate 3
To screw. Then, by screwing the annular fastener 4, the shoulder 9a of the enlarged diameter portion 9 comes into contact with the inward flange portion 4b and is prevented from coming off, and the casing 1 and the set plate 3 are combined and integrated.

The annular fastener 4 of this embodiment has an outer end surface 4d (upper surface in the figure) of an inward flange portion 4b.
The thick plate-shaped projections 18 as tool engagement projections extending in the axial direction are provided at, for example, four positions at an equal angular pitch. By turning the annular fastener 4 so that the L-shaped claw at the tip of a tool having a free end formed in an arc shape is hooked on the projection 18, the fastening force can be increased. Conversely, it can be easily removed by hooking and turning, and the filter medium 2 can be easily replaced.

The radially inward end face of the projection 18 is
As shown in FIG. 1, the casing 1 is formed so as to be close to the outer peripheral surface of the body 8 of the casing 1. In this way, when the annular fastener 4 is fitted to the body 8 and turned, the fall of the annular fastener 4 with respect to the axis of the casing 1 can be prevented, and the centering when turning the annular fastener 4 can be prevented. Effective as a guide. Further, the thick plate-shaped projection 18 is formed so as to extend in the radial direction, so that the opening between the ring nut portion 4a and the inward flange portion 4b of the annular fastener 4 can be prevented. Has the effect of increasing the rigidity of

In the set plate 3 according to the present invention, an oil guide groove 19 having, for example, a semicircular cross-sectional shape as a fluid passage which opens into the detent groove 17 and penetrates in the axial direction is formed in the detent groove 17. Is formed. For example, if the oil in the casing 1 starts to leak from the O-ring 11 due to the improper installation of the O-ring 11, the oil groove 19
The oil can flow out of the filter through the filter, so that a problem of oil leakage can be found early and easily.

FIG. 4 is a partially enlarged side view showing a second embodiment according to the present invention. Parts similar to those of the above-described embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted. In FIG. 4, an oil guide groove 20 is formed in the set plate 3 as a fluid passage extending from the end face of the detent groove 17 for receiving the engaging tongue piece 9b to the axially outer end face in the drawing. I have. As shown in the drawing, the oil guide groove 20 is formed in a tapered groove shape in which the groove width (circumferential width) is gradually narrowed toward the axially outer end face of the set plate 3. By doing so, the detent groove 1
It is possible to secure a sufficient amount of catching oil leaking into the inside 7 and to minimize the amount of outflow to the outside.

FIG. 5 is a partial cross-sectional view corresponding to FIG. 1 showing the third embodiment, and the same parts as those in the above-mentioned embodiment are denoted by the same reference numerals and detailed description thereof will be omitted. In the third embodiment, a portion of the annular fastener 4 where the projection 18 is provided is formed as a fluid passage so as to penetrate through the projection 18 from the inward flange portion 4b and communicate with the inside and outside of the annular fastener 4. An oil confirmation hole 21 is provided. By forming the hole in the thick portion in this way, it is advantageous in terms of strength, and there is an opening of the hole on the side facing outward when attached to the engine, so that it is possible to easily confirm oil leakage. Also, the protrusion 18
Since the oil flows out, it is possible to easily confirm the oil leak as compared with the case where it is unknown where the oil comes from the entire circumference.

FIG. 6 is a partial sectional view corresponding to FIG. 1 showing the fourth embodiment, FIG. 7 is a partial side view taken along the line VII in FIG. 6, and FIG. 8 is an arrow VIII in FIG. It is a partial end view seen from the line, and the same reference numerals are given to the same portions as those in the above-described embodiment, and the detailed description thereof will be omitted. In the fourth embodiment, an oil guide groove 22 as a fluid passage communicating with the thread portion of the ring nut portion 4a and extending in the radial direction is formed on the axially inner end face of the inward flange portion 4b of the annular fastener 4. It is recessed. By doing so, the oil guide groove 22 can be easily formed, and the oil flows out to the casing 1 side, so that the confirmation can be easily performed. Further, the oil guide groove 22 is provided on the lower surface of the protruding portion 18, so that the rigidity can be prevented from being reduced by providing the oil guide groove 22.

As shown in FIG. 8, an oil guide groove 23 as a fluid passage extending in the axial direction may be provided in the thread portion of the ring nut portion 4a. By forming the oil guide groove 23 by cutting off the thread,
The oil can flow out without being hindered by the thread, which can promote early detection of an oil leak. It is not necessary to provide the oil guide groove 22 and the main oil guide groove 23 at the same time, and only one of them may be provided.

FIG. 9 is a partial cross-sectional view corresponding to FIG. 1 showing the fifth embodiment, and FIG. 10 is a partial end view viewed from the arrow X in FIG. Are denoted by the same reference numerals and their detailed description is omitted. This fifth
In the embodiment of the present invention, a plurality of projections 24 as tool engagement projections are provided on the outer peripheral surface of the ring nut portion 4a of the annular fastener 4, and any projection 24 of the annular fastener 4 is provided. An oil confirmation hole 25 is formed in the portion as a fluid passage penetrating through the protrusion 24 and the ring nut portion 4a in the radial direction. By doing so, there is an effect that the strength is ensured by providing the hole in the thick portion, and that it is easy to confirm that the oil can flow out to the outer peripheral surface side of the annular fastener 4. In addition, since the oil flows out to the projection 24, it is possible to easily confirm the oil leakage as in the third embodiment.

Further, in the annular fastener 4 in the fifth embodiment, the oil confirmation hole 25 is not limited to be provided so as to penetrate in the radial direction as described above, and as shown in FIG. An oil checking groove extending in the axial direction may be provided by cutting off a part of the threaded portion of the ring nut portion 4a. Also in this case, by providing the annular fastener 4 at a position corresponding to the tool engaging projection 24, the rigidity of the annular fastener 4 can be prevented from lowering.

In the third to fifth embodiments, a semicircular notch 26 is preferably provided at the peripheral edge of the enlarged diameter portion 9 of the casing 1 as shown in FIG. This notch 26
And the oil confirmation hole 21, the oil guide groove 22, and the oil confirmation hole 25 in each embodiment are formed so as to substantially coincide with each other when the annular fastener 4 is rotated and tightened.
The leaked oil easily flows to the oil confirmation hole 21, the oil guide groove 22, and the oil confirmation hole 25 in each embodiment. Further, whether or not the O-ring 11 is attached can be confirmed from the notch 26.

As described above, since the edge of the enlarged diameter portion 11 abuts on the set plate 3 in the assembled state in order to restrict the crushing allowance of the O-ring 11, the amount of rotation of the annular fastener 4 when tightening is reduced. In order to make the notch 26 substantially uniform, the start of threading of the external thread 3c of the set plate 3 and the internal thread 4c of the annular fastener 4 are matched.
Can be easily adjusted. In addition, the cut depth of the notch 26 may be set to about １ ／ of the height of the O-ring 11, so that the O-ring 11 can be prevented from protruding from the notch 26.

[0027]

As described above, according to the present invention, when oil leaks due to improper installation of the sealing means or the like, oil flows into the engagement recess for rotation prevention, and is more circumferentially than the engagement recess. Since the leaked oil flows out through the narrowed liquid flow passage, the leaked oil can be discharged to the outside collectively, and the oil leak can be found early and the liquid flow passage is narrowed. It also has the effect of preventing intrusion of dust and the like from the outside. In addition, by providing a fluid passage between the enlarged diameter portion of the casing and the inward flange portion of the annular fastener, oil can flow out to the casing side and can be easily found, and the fluid passage is formed between the casing and the annular fastener. Because it is provided between the components,
It is possible to prevent trash clogging. Further, by providing the annular fastener with a fluid passage formed of a through hole communicating between the inside and the outside via the tool engagement projection, the fluid passage is provided in the thick portion, and the rigidity of the annular fastener is secured. In addition to the above, confirmation from the outside can be easily performed in the same manner as described above.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an engine oil filter for an automobile to which the present invention is applied.

FIG. 2 is an end view of the engine mounting side as viewed from the arrow II line in FIG. 1;

FIG. 3 is an exploded perspective view of a main part of the filter.

FIG. 4 is a partially enlarged side view showing a second embodiment.

FIG. 5 is a partial sectional view showing a third embodiment and corresponding to FIG. 1;

FIG. 6 is a partial sectional view corresponding to FIG. 1 showing a fourth embodiment.

FIG. 7 is a partial side view as seen from the arrow VII line in FIG. 6;

FIG. 8 is a partial end view as viewed from the arrow VIII line in FIG. 6;

FIG. 9 is a partial cross-sectional view corresponding to FIG. 1 showing a fifth embodiment.

FIG. 10 is a partial end view seen from the arrow X line in FIG. 9;

FIG. 11 is a perspective view showing another embodiment of the casing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Filter medium 3 Set plate 3a Screw hole 3b Communication hole 3c Male thread part 4 Annular fastener 4a Ring nut part 4b Inward flange part 4c Female thread part 4d Outer end face 5 Valve 6 Relief valve 7 Check spring 8 Body part 9 Large diameter part 9a Shoulder 9b engaging tongue 11 O-ring 12 O-ring guide body 13a / 13b annular rib 13c outer wall 14 annular groove 15 ring packing 16 radial rib 17 detent groove 18 protrusion 19 oil guide groove 20 oil guide groove 21 oil check Hole 22 Oil guide groove 23 Oil guide groove 24 Projection 25 Oil check hole 26 Notch 28 Radial rib

Continued on the front page (72) Inventor Keiichi Terada 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo ▲ ▼ Machine Manufacturing Co., Ltd. (72) Inventor Hiroaki Yamashita 7800 Nakase Nakase, Hamakita City, Shizuoka Prefecture Toyo ▲ ▼ Machine Manufacturing Co., Ltd. (72) Inventor Hiroshi Morikawa 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo Machine Manufacturing Co., Ltd. (56) References JP-A-7-100307 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) B01D 27/08 B01D 35/02 F01M 11/03

Claims (3)

(57) [Claims] 1. A casing having a bottomed cylindrical body for containing a filter medium, an enlarged diameter portion provided at an opening of the body, and an opening having an outflow / inflow port into the casing. And an end plate having an external thread portion having a diameter larger than that of the enlarged diameter portion, a ring nut portion screwable to the external thread portion, and an axial end portion of the ring nut portion so as to be able to contact the enlarged diameter portion. An annular fastener having an inward flange portion formed on the end plate, and a sealing means provided between the casing and the radially inner portion of the end plate with respect to the male screw portion, the inward flange portion having A filter in which the casing and the end plate are integrated by screwing the ring nut portion to the male screw portion while being in contact with the enlarged diameter portion, wherein the casing and the end plate are relatively opposed to each other. To prevent rotation, An engagement protrusion formed to extend toward the male screw portion at an axial end edge of the enlarged diameter portion of the ring, and an axial end surface of the male screw portion capable of receiving the engagement protrusion. An engaging recess formed in the outer peripheral surface of the external thread portion, which is open to the casing side and reaches the intermediate portion in the axial direction, wherein the external thread portion has an axially opposite end face of the external thread portion on the casing side. A filter that is open on the side opposite to the above and communicates with the engagement recess and that is narrower than the engagement recess in the circumferential direction of the male screw portion. 2. A casing having a cylindrical body with a bottom that accommodates a filter medium, an enlarged diameter portion provided at an opening of the body, and an opening having an outflow inlet into the casing. And an end plate having an external thread portion having a diameter larger than that of the enlarged diameter portion, a ring nut portion screwable to the external thread portion, and an axial end portion of the ring nut portion so as to be able to contact the enlarged diameter portion. An annular fastener having an inward flange portion formed on the end plate, and a sealing means provided between the casing and the radially inner portion of the end plate with respect to the male screw portion, the inward flange portion having A filter in which the ring nut portion is screwed to the male screw portion while being in contact with the enlarged diameter portion to integrate the casing and the end plate, wherein the enlarged diameter portion and the inward flange portion are provided. Fluid passage is provided between Filter, wherein the door. 3. A casing having a cylindrical body having a bottom and containing a filter medium, an enlarged diameter portion provided at an opening of the body, and an opening having an outlet and an inlet into the casing. And an end plate having an external thread portion having a diameter larger than that of the enlarged diameter portion, a ring nut portion screwable to the external thread portion, and an axial end portion of the ring nut portion so as to be able to contact the enlarged diameter portion. An annular fastener having an inward flange portion formed on the end plate, and a sealing means provided between the casing and the radially inner portion of the end plate with respect to the male screw portion, the inward flange portion having A filter in which the ring nut portion is screw-connected to the external thread portion while being in contact with the enlarged diameter portion, so that the casing and the end plate are integrated with each other; Screw the ring nut into the male thread A projecting tool engaging projection when the annular fastener is provided with a fluid passage penetrating through the tool engaging projection so as to communicate inside and outside. filter.