JPH07251009A - Filter - Google Patents

Abstract

PURPOSE:To make a filter as compact as possible and from which a filter medium held in a casing is replaceable. CONSTITUTION:The opening of a closed-end cylindrical casing 1 for holding a filter medium 2 is covered with a setting plate 3. An annular clamp 4 is fitted to the shell part 8 of the casing 1. The inward flange part 4b of the annular clamp 4 is allowed to abut 4 against the shoulder part 9a of a diameter- expanding part 9 formed in the opening side of the casing 1. The ring nut part 4a of the annular clamp 4 is screwed in the male screw part 3c of the setting plate 3. A projection part 18 lengthened in the axial direction is provided on the outside end face in the axial direction of the inward flange part 4b of the annular clamp 4. The annular clamp 4 is turned and tightened by applying a tool to the projection part 18 and the setting plate 3 is combined with the casing 1. Thereby, the maximum outside diameter of a filter capable of replacing the filter medium is made small by providing the projection part for fitting the tool without forming the projection part on the outer circumferential face of the annular clamp.

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 with each other through a fastening member so that a filter medium can be replaced.

[0002]

2. Description of the Related Art Heretofore, there have been various filters in which a filter medium can be replaced. For example, Japanese Patent Laid-Open No. 21910/1990.
Some are disclosed in Japanese Patent Publication. In a filter having such a structure, a cylindrical casing having a bottom for accommodating the filter medium, a lid member (a pipe joint coupling member) for closing the opening of the casing so that the inside and outside of the casing can communicate with each other, and the lid member In order to integrate the casing with the casing, there is provided an annular fastener that is prevented from coming off by an enlarged diameter portion (outward flange portion) provided in the opening portion of the casing and screwed to the lid member.

The annular fastener in the above filter is provided with a plurality of protrusions having a plurality of wall thicknesses on its outer peripheral surface so that a hand tool such as a pin spanner can be applied when tightening the screw. However, the provision of the thick protrusions causes a large outer diameter of the annular fastening portion, resulting in an increase in size of the filter.

[0004]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the main object of the present invention is to provide a filter which can be made as compact as possible.

[0005]

According to the present invention, there is provided a casing having a cylindrical body with a bottom for accommodating a filter medium and a diameter-increasing portion provided in an opening of the body. When,
An end plate that has an outflow inlet into the casing, covers the opening, and has a male screw portion having a larger diameter than the enlarged diameter portion, a ring nut portion that can be screwed into the male screw portion, and the enlarged diameter portion. An annular fastener provided with an inward flange portion formed at an axial end portion of the ring nut portion so that the ring nut portion can be brought into contact with the ring nut portion while contacting the inward flange portion with the expanded diameter portion. A screw threadedly coupled to the male screw portion to integrate the casing and the end plate, wherein the annular fastener has at least one of both axial end faces of the ring nut portion. It is achieved by providing a filter characterized in that a tool engaging portion is provided when the ring nut portion is screwed into the male screw portion. Further, the annular fastener may be provided with a tool engaging projection when the ring nut portion is screwed into the male screw portion on the outer surface of the inward flange portion, and particularly, the tool engaging portion. However, it is preferable that it is formed so as to be substantially flush with the inner peripheral surface of the inward flange and extend along the outer peripheral surface of the body portion.

[0006]

With this configuration, the tool is hooked on the projection provided on the axial end surface of the annular fastener or the outer surface of the inward flange to rotate the casing without providing the projection on the outer peripheral surface of the annular fastener. It is possible to perform a work of tightening the annular fastener so that the end plate and the end plate are integrated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view showing an engine oil filter for an automobile to which the present invention is applied. In the figure, a cylindrical filter medium 2 is coaxially housed in a cylindrical casing 1 having a bottom, and the opening end portion of the lower end of the casing 1 in the figure has an end covering the opening. A set plate 3 as a plate is connected to the casing 1 by an annular fastener 4 that surrounds the casing 1.

The set plate 3 is provided at its center with a through screw hole 3a screwed into a pipe joint projecting from a cylinder block (not shown), and a plurality of communication holes are provided in the 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 portion through a number of holes provided in the cylindrical partition wall on the inner peripheral side thereof,
It is returned to the cylinder block through the through screw hole 3a. On the filter medium 2 side of the set plate 3, an annular disc-shaped valve 5 is provided 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 an increase in hydraulic pressure when the clogging of the filter paper exceeds a permissible value. Further, between the filter medium 2 and the bottom surface of the casing 1 (upper side in the figure), a check including a leaf spring for elastically holding the filter medium 2 between the set plate 3 and the bottom surface of the casing 1 is performed. The spring 7 is interposed.

The casing 1 has a body portion 8 for containing 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 opposing end surface of the expanded diameter portion 9. Further, the outer diameter of the set plate 3 is set to be slightly larger than the outer diameter of the expanded diameter portion 9, so that the abutting amount of the set plate 3 and the expanded diameter portion 9 can be made constant, It is possible to make the crushing margin of the O-ring 11 that is sandwiched between the halves constant. In addition,
An O-ring guide body 12 having an annular band material is fixed near the open end of the inner peripheral surface of the body portion 8 in order 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 male screw portion 3c formed on the outer peripheral surface of the set plate 3. It has a nut portion 4a and an inward flange portion 4b formed so as to extend radially inward from the axial end portion of the ring nut portion 4a and to be close to the outer peripheral surface of the body portion 8.
On the inner peripheral surface of the ring nut portion 4a, the male screw portion 3
A female screw portion 4c that is screwed into c is formed.

As shown in FIG. 2, a ring packing 15 is attached to an end surface 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. There is. 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 places (six places in the embodiment) so as to connect both annular ribs 13a and 13c. ing.

Further, as shown in FIG. 3, the male screw portion 3c of the set plate 3 is provided with anti-rotation grooves 17 at, for example, three positions at an equal angular pitch. The detent groove 17 is open to the axially inner end surface on the casing 1 side in the assembled state of the set plate 3, and is cut to the axially intermediate portion in the opposite outer end surface directions.
An engaging tongue piece 9b extending in the axial direction so as to engage with the detent groove 17 at the time of assembly at the end edge of the expanded diameter portion 9 of the casing 1.
Are respectively provided at corresponding positions. The radial ribs 16 are provided so as to correspond to the respective detent grooves 17, and the radial ribs 16 reinforce the reduction in rigidity due to the provision of the detent grooves 17. Further, the set plate 3 includes a peripheral wall of the through screw hole 3a and an annular rib 13a.
And a radial rib 28 is provided at a position that divides each communication hole 3b in the circumferential direction, and by these, the rigidity around the through screw hole 3a and the communication hole 3b of the set plate 3 can be increased.

In the filter thus constructed, the filter medium 2 is housed in the casing 1 and the rotation preventing groove 1 is provided.
7 and the engaging tongue piece 9b are engaged with each other to prevent the set plate 3 and the casing 1 from rotating relative to each other, while the annular fastener 4 is fitted from the body portion 8 side to the male screw portion 3c of the set plate 3.
Screw into. Then, by screwing the annular fastener 4, the shoulder portion 9a of the expanded diameter portion 9 abuts against the inward flange portion 4b and is prevented from coming off, and the casing 1 and the set plate 3 are joined and integrated.

By the way, in the annular fastener 4 according to the present invention, a thick plate-shaped projection as a tool engaging portion extending in the axial direction on the outer end surface 4d (upper surface in the drawing) of the inward flange portion 4b. 18 are provided at, for example, four positions at an equal angular pitch. It is possible to increase the fastening force by turning the annular fastener 4 so that the L-shaped claw portion at the tip of the tool having the free end formed in an arc shape is hooked on the protrusion 18. In addition, the filter medium 2 can be easily removed by hooking and turning it, and the filter medium 2 can be easily replaced.

The radially inward end face of the protrusion 18 is
As well shown in FIG. 1, it is formed so as to closely follow the outer peripheral surface of the body portion 8 of the casing 1. This makes it possible to prevent the annular fastener 4 from falling down with respect to the axis of the casing 1 when the annular fastener 4 is fitted into the body portion 8 and turned, and for centering when the annular fastener 4 is turned. Effective as a guide. Further, the thick plate-shaped protrusion 18 is formed so as to extend in the radial direction, and it is possible to prevent the ring nut portion 4a of the annular fastener 4 and the inward flange portion 4b from being opened, and thus the annular fastener 4 Has the effect of increasing the rigidity of.

The detent groove 17 of the set plate 3
An oil guide groove 19 having, for example, a semicircular cross-section, which is open in the rotation preventing groove 17 and penetrates in the axial direction, is formed in the portion. For example, when the oil inside the casing 1 starts to leak from the O-ring 11 due to improper mounting of the O-ring 11, the oil may flow out of the filter through the oil guide groove 19, so that the problem of oil leakage may occur at an early stage. Can be easily found.

In the above embodiment, the case where the projection is provided as the tool engaging portion is shown, but the present invention is not limited to the projection shape, and the recess is provided and the tip of the tool is recessed. You may make it engage with. Also in this case, the tool engaging portion can be provided without increasing the outer diameter of the filter as in the above-described embodiment.

FIG. 4 shows a set plate 3 according to the invention.
It is a principal part enlarged plan view which shows the 2nd Example of the tool engagement part of this, and attaches | subjects the same code | symbol about the same part as the said Example, and abbreviate | omits the detailed description. Projection 18 of the above embodiment
Was formed in a thick plate shape and its cross-sectional shape was rectangular, but the projection 21 of the present embodiment has a trapezoidal cross-sectional shape whose inner side in the radial direction is narrowed, as shown in FIG. It is shaped like an eggplant.

By forming the projection 21 having the trapezoidal cross section in this manner, the tool 22 having the hook 22a bent at an acute angle as shown in FIG. 4 is used.
The set plate 3 can be easily tightened by turning the tool 22 in the direction of arrow A in FIG. Other effects are similar to those of the first embodiment.

FIG. 5 is an enlarged plan view of an essential portion showing the third embodiment. The same parts as those in the above embodiment are designated by the same reference numerals and detailed description thereof will be omitted. The projecting portion 23 as the tool engaging portion in the present embodiment has a portion extending in the radial direction and the ring nut portion 4 as well shown in FIG.
It is formed so as to have an L-shaped cross-sectional shape composed of an outer peripheral surface of a and a portion extending in the circumferential direction so as to form the same surface.

Also in the case of the third embodiment, as in the second embodiment, the tool 22 having the claw portion 22b formed so as to have a shape substantially complementary to the projection 23 is used. As a result, the engagement between the tool 22 and the protrusion 23 can be further ensured, and the set plate 3 can be easily rotated and tightened. Other effects are similar to those of the first embodiment. In addition, the protrusion 23 may be formed to have a T-shaped cross-section outward in the radial direction so that the same tool can be used when loosening the set plate 3.

FIG. 6 (a) is a sectional view of the essential part showing the fourth embodiment, and FIG. 6 (b) is an enlarged plan view of the essential part similar to that of FIG. The same symbols are given to the parts of and the detailed description thereof is omitted. The protrusion 24 as a tool engaging portion in the present embodiment has an oval cross-sectional shape extending in the circumferential direction so as to form the same surface as the outer peripheral surface of the ring nut portion 4a of the annular fastener 4, It is formed so as to project from a corner of the ring nut portion 4a and the inward flange portion 4b. In the case of this embodiment, there is an effect of increasing the rigidity of the corner portion between the ring nut portion 4a and the inward flange portion 4b.

FIG. 7 is a sectional view of the essential parts showing the fifth embodiment, FIG. 8 is a partial side view taken along the line VIII in FIG. 7, and FIG. 9 is taken along the line IX in FIG. It is a partial end view,
The same parts as those in the above-mentioned embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The tool engaging portion in this embodiment is formed so as to extend in the axial direction from both axial end surfaces of the ring nut portion 4a of the annular fastener 4, respectively, and the ring nut portion 4a is shown in FIG. A protrusion 18 similar to that of the first embodiment is provided on the upper end surface of the shaft, and a large number of protrusions 25 are formed on the lower end surface of the ring nut portion 4a in the circumferential direction in the shape of a comb. Further, the expanded diameter portion 9 of the casing 1
Is provided with a tongue piece 26 extending from its axially open end face so as to be parallel to the protrusion 25 at a proper position in the circumferential direction. The tongue piece 26 may be a further extension of the engaging tongue piece 9b, and engages with the detent groove 17 of the set plate 3 as described above.

With this structure, when the annular fastener 4 is screwed onto the male screw portion 3c of the set plate 3, first, as in the first embodiment, a tool is hooked on the protrusion 18 and tightened. Next, as shown in the drawing, a rod-shaped tool 27 is inserted between the adjacent protrusions 25, and the tip end of the tool 27 is engaged with one circumferential end of the tongue piece 26 as shown in FIG. Then, the annular fastener 4 can be rotated by tilting the base end side of the tool 27 in the direction of the arrow B in the drawing with the engagement point serving as a fulcrum, so that the additional tightening of the annular fastener 4 is easily performed. be able to.

By providing a plurality of tongue pieces 26 and setting the relative pitches of the tongue pieces 26 and the projections 25 at unequal pitches, the position of the circumferential end of the tongue pieces 26 facing between the projections 25 can be adjusted. Since the tongue pieces 26 are different in the circumferential direction, it is possible to suitably perform the retightening by appropriately changing the inserting place of the tool 27. Further, in the embodiment, the tool engaging projections are provided on both end surfaces in the axial direction of the annular fastener 4, respectively. However, only the projections 25 provided in the shape of a comb tooth may be provided. In that case, only the rod-shaped tool 27 is provided. Can be used, and it is not necessary to prepare a special tool having a complicated shape. For example, a driver can be used.

[0028]

As described above, according to the present invention, the tool engaging portion for hooking the tool for turning and tightening the annular fastener is provided on the axial end surface of the annular fastener, so that The maximum outer diameter does not increase, and the filter can be prevented from increasing in size. Further, by providing the tool engaging portion on the inward flange portion of the annular fastener, the rigidity of the inward flange portion can be increased, the opening can be prevented, and the sealing property between the casing and the end plate can be improved. . Further, by forming the tool engaging portion so that the outer peripheral surface of the body of the casing can be guided, centering consistency between the casing and the annular fastener can be ensured, and the inclination of the axis line of the annular fastener at the time of turning can be secured. In addition to being able to prevent, it is possible to prevent the casing from collapsing due to vibration after tightening.

[Brief description of drawings]

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

2 is an end view of the engine mounting side as seen from the line II in FIG.

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

FIG. 4 is an enlarged plan view of an essential part of a tool engagement portion showing a second embodiment.

FIG. 5 is an enlarged plan view of an essential part of a tool engagement portion showing a third embodiment.

6A is a cross-sectional view of a main part showing a fourth embodiment, and FIG. 6B is an enlarged plan view of a main part similar to FIG.

FIG. 7 is a cross-sectional view of essential parts showing a fifth embodiment.

FIG. 8 is a partial side view seen from the arrow VIII line in FIG.

9 is a partial end view as seen from the arrow IX line in FIG. 7.

[Explanation of symbols]

 1 casing 2 filter media 3 set plate 3a screw hole 3b communication hole 3c male screw part 4 annular fastener 4a ring nut part 4b inward flange part 4c female screw part 4d outer end face 5 valve 6 relief valve 7 check spring 8 body part 9 expanded 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 Projection 19 Oil guide groove 21 Projection 22 Tool 22a Claw Part 23 Projection 24 Projection 25 Projection 26 Tongue 27 Tool 28 Radial rib

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiichi Terada, 7800 Nakase, Hamakita-shi, Shizuoka Prefecture, Toyo Roki Machine Manufacturing Co., Ltd. Co., Ltd. (72) Inventor Hiroshi Morikawa 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo Machine Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A casing having a cylindrical body with a bottom for accommodating a filter medium, a diameter-increasing portion provided in an opening of the body, and an opening having an outflow inlet into the casing. And an end plate having a male screw portion having a diameter larger than that of the enlarged diameter portion, a ring nut portion that can be screwed into the male screw portion, and an axial end portion of the ring nut portion that can come into contact with the enlarged diameter portion. And an annular fastener provided with an inward flange portion formed in, the ring nut portion is screwed to the male screw portion while abutting the inward flange portion to the expanded diameter portion, and the casing and the end. A filter configured to be integrated with a plate, wherein the annular fastener is screwed onto the male screw portion of the ring nut portion on at least one of both axial end faces of the ring nut portion. The tool engaging part of Filter, wherein the door. 2. A casing having a tubular body with a bottom for accommodating a filter medium and a diameter-increasing portion provided in an opening of the body, and an opening having an outlet / inlet port into the casing. And an end plate having a male screw portion having a diameter larger than that of the enlarged diameter portion, a ring nut portion that can be screwed into the male screw portion, and an axial end portion of the ring nut portion that can come into contact with the enlarged diameter portion. And an annular fastener provided with an inward flange portion formed in, the ring nut portion is screwed to the male screw portion while abutting the inward flange portion to the expanded diameter portion, and the casing and the end. A filter configured to be integrated with a plate, wherein the annular fastener is provided on an outer surface of the inward flange portion with a tool engaging protrusion when the ring nut portion is screwed into the male screw portion. A filter characterized by being provided. 3. The tool engaging portion is formed so as to be substantially flush with the inner peripheral surface of the inward flange and extend along the outer peripheral surface of the body portion. The filter according to claim 2.