JP3076495B2 - 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.

The annular fastener in the above-mentioned filter has a plurality of thick protrusions on its outer peripheral surface in order to hang a hand tool such as a pin wrench at the time of screw tightening. However, the provision of the thick protrusion has a problem that the outer diameter of the annular fastening portion is large and the filter becomes large.

[0004]

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

[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 And 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 the ring nut portion is caused to contact the inward flange portion with the enlarged diameter portion. Wherein the casing and the end plate are integrated with each other by screw connection with the male screw portion, wherein the annular fastener has at least one of both axial end surfaces of the ring nut portion. A tool is engaged when the ring nut portion is screwed into the male screw portion.
It is achieved by providing a filter, wherein the collision portion of the order is provided. Also, the tool
A protrusion for engaging the ring nut and the inward
It is provided to protrude from the corner with the flange.
In addition, the projection for engaging the tool is provided with the ring nut.
From the comb-shaped protrusion formed on the outer axial end face of the
And at the enlarged diameter portion, from its axial opening end face.
A plurality of tongue pieces extending parallel to the comb-shaped protrusion
Is provided around the comb-shaped protrusion and the plurality of tongue pieces.
Preferably, the relative pitch in the direction is unequal. Ah
Alternatively, it is preferable that the annular fastener is provided with a tool engaging projection for screwing the ring nut portion to the male screw portion on an outer surface of the inward flange portion. use collision portion, may form an inner peripheral surface and substantially the same surface of the inward flange and is formed so as to extend along the outer peripheral surface of the barrel.

[0006]

With this configuration, the casing is turned by applying a tool to the projection provided on the axial end face of the annular fastener or the outer face of the inward flange without providing a projection on the outer peripheral surface of the annular fastener. An operation for tightening the annular fastener so as to integrate the end plate with the end plate can be performed.

[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.

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. The radial ribs 16 are provided corresponding to the respective detent grooves 17, and the reduction in rigidity due to the provision of the detent grooves 17 is reinforced by the radial ribs 16. The set plate 3 has a peripheral wall of the through screw hole 3a and an annular rib 13a.
And radial ribs 28 are provided at positions that divide the communication holes 3b in the circumferential direction, so that the rigidity around the through screw holes 3a and the communication holes 3b of the set plate 3 can be increased.

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.

Incidentally, the annular fastener 4 according to the present invention has an inward flange portion 4 which is one of both end surfaces in the axial direction.
A thick plate-shaped projection 18 as a tool engagement projection (projection for engaging a tool) extending in the axial direction on the outer end surface 4d (upper surface in the figure) of the outer surface 4b of FIG. For example, at four locations. 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

The detent groove 17 of the set plate 3
Is formed in the detent groove 17 and an oil guide groove 19 having a semicircular cross section, for example, penetrating in the axial direction is formed. For example, when 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 can flow out of the filter through the oil guide groove 19, so that the problem of the oil leak can be quickly and quickly solved. Can be easily found.

[0019]

FIG. 4 shows a set plate 3 according to the present invention.
FIG. 5 is an enlarged plan view of a main part of a second embodiment of the tool engaging portion of FIG. Projection 18 of the above embodiment
Was formed in a thick plate shape, and the cross-sectional shape was rectangular. However, as shown in FIG. 4, the protrusion 21 of this embodiment has a trapezoidal cross-sectional shape in which the inside in the radial direction is narrowed. It is formed so as to form.

By forming the projection 21 having a trapezoidal cross-sectional shape in this manner, a tool 22 having a hook 22a bent at an acute angle as shown in FIG.
By turning the tool 22 in the direction of the arrow A in FIG. 4 in a more reliable manner, the set plate 3 can be easily turned and tightened. Other effects are similar to those of the first embodiment.

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

Also in the case of the third embodiment, a tool 22 having a claw portion 22b formed so as to have a substantially complementary shape to the projection 23 as in the second embodiment is used. Thereby, the engagement between the tool 22 and the projection 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. Note that the projection 23 may be formed to have a T-shaped cross-section facing outward in the radial direction so that the same tool can be used when the set plate 3 is loosened.

FIG. 6A is a 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. Are given the same reference numerals, and detailed description thereof is omitted. The protrusion 24 as a tool engagement 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 protrude from a corner between 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 between the ring nut portion 4a and the inward flange portion 4b.

FIG. 7 is a sectional view of a principal part showing a fifth embodiment, FIG. 8 is a partial side view taken along the line VIII of FIG. 7, and FIG. 9 is a view taken along the line IX of FIG. It is a partial end view,
The same parts as those in the above embodiment are denoted 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, and is shown in FIG. A protrusion 18 similar to that of the first embodiment is provided on the upper end surface of the ring nut 4a, and a number of protrusions 25 are formed in a circumferential direction on the lower end surface of the ring nut portion 4a. Also, the enlarged diameter portion 9 of the casing 1
, A tongue piece 26 extending in parallel with the projection 25 from its axial opening end face is provided at an appropriate 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.

In this structure, when the annular fastener 4 is screwed into the male screw portion 3c of the set plate 3, a tool is first hooked on the projection 18 as in the first embodiment and tightened. Next, as shown in the figure, a bar-shaped tool 27 is inserted between the adjacent projections 25, and the tip of the tool 27 is engaged with one circumferential end of the tongue piece 26 as shown in FIG. The annular fastener 4 can be turned by tilting the base end side of the tool 27 in the direction of arrow B in the drawing with the engagement point as a fulcrum, so that the annular fastener 4 can be easily retightened. be able to.

By providing a plurality of tongue pieces 26 and making the relative pitch between the tongue pieces 26 and the protrusion 25 unequal, the position of the circumferential end of the tongue piece 26 facing between the protrusions 25 can be adjusted. Since each tongue piece 26 is different in the circumferential direction, retightening can be suitably performed by appropriately changing a place where the tool 27 is inserted. Further, in the embodiment, the tool engagement projections are provided on both end faces in the axial direction of the annular fastener 4, however, only the projection 25 provided in a comb shape may be used, in which case only the bar-shaped tool 27 is used. It is not necessary to prepare a special tool having a complicated shape, and for example, a driver can be used.

[0028]

Effects of the Invention According to the present invention, by providing the collision portion for engaging a tool when tightening turning screwed annular fastener in the axial direction end surface of the annular fastener, maximum outer diameter of the annular fastener does not become large, it is possible to prevent an increase in the size of the filter, and the ring nut the projection
Provide so as to protrude from the corner with the inward flange
Rigidity of the corner between the ring nut and the inward flange
Can be further increased, the outer axis of the ring nut part
And a comb-shaped projection formed on the end face in the direction.
It is parallel to the comb-shaped protrusion from the axial opening end face of the diameter part.
And a plurality of tongue pieces that extend
To make the circumferential relative pitch with the tongue piece unequal pitch
More suitable by changing the insertion place of the tool as appropriate
Can be retightened . Moreover, improved by providing the collision portion for tool engagement to inward flange portion of the annular fastener, it is possible to increase the rigidity of the inward flange portion, to prevent the mouth opening of the sealing between the casing and the end plate I can do it.
Further, by forming a butt portion for the tool engaging the outer peripheral surface of the body portion of the casing guide capable, it can ensure centering consistency between the casing and the annular fastener, turning the ring fastener axis during tightening In addition to preventing inclination, the casing can be prevented from falling due to vibration or the like after tightening.

[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 an enlarged plan view of a main part of a tool engaging portion showing a second embodiment.

FIG. 5 is an enlarged plan view of a main part of a tool engaging portion according to a third embodiment.

FIG. 6A is a 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 an essential part cross-sectional view showing a fifth embodiment.

FIG. 8 is a partial side view as seen from the arrow VIII line in FIG. 7;

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

[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 Engagement 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 piece 27 Tool 28 Radial rib

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keiichi Terada 7800 Nakase, Hamakita City, Shizuoka Prefecture Toyo ▲ ▼ Machine manufacturing Co., Ltd. Co., Ltd. (72) Inventor Hiroshi Morikawa 7,800 Nakase, Hamakita City, Shizuoka Pref. Toyo Machine Manufacturing Co., Ltd. (56) References Japanese Utility Model Sho-51-128364 (JP, U) Japanese Utility Model Sho-51-128365 (JP) , U) Jpn. 63-13658 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 27/08 B01D 35/02

Claims (5)

(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. And an annular fastener provided with an inward flange portion formed on the casing. The ring nut portion is screwed to the male screw portion while the inward flange portion is in contact with the enlarged diameter portion, and the casing and the end are joined together. A filter configured to integrate the ring nut portion with the male screw portion on at least one of both axial end surfaces of the ring nut portion. Protrusion for engaging a tool with the <br/> Is provided, The filter characterized by the above-mentioned. (2) The projection for engaging the tool is
From the corner between the ring nut and the inward flange.
2. The device according to claim 1, wherein the device is provided so as to output.
The filter according to. (3) The projection for engaging the tool is
The comb formed on the outer axial end face of the ring nut
The enlarged diameter portion has an axial direction.
Extend from the open end face so as to be parallel to the comb-shaped protrusion
Multiple tongue pieces are provided, A circumferential relative pinion between the comb-shaped protrusion and the plurality of tongue pieces is provided.
The switches are unequal pitch
3. The filter according to 2. 4. 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 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. And an annular fastener provided with an inward flange portion formed on the casing. The ring nut portion is screwed to the male screw portion while the inward flange portion is in contact with the enlarged diameter portion, and the casing and the end are joined together. A filter configured to integrate a plate and a plate, wherein the annular fastener is provided on an outer surface of the inward flange portion with a tool engagement protrusion for screwing the ring nut portion to the male screw portion. A filter characterized in that it has been used. Wherein said tool engaging end collision portion, characterized in that it is formed so as to extend along the outer peripheral surface of the forming the inner peripheral surface and substantially the same surface of the inward flange and the barrel The filter according to claim 4 , wherein