JP2009011960A - Oil strainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil strainer the filter unit of which can be inserted into the strainer body even when the centerline of the inlet opening crosses an axis of the strainer body. <P>SOLUTION: The oil strainer S1 has the filter unit U1 inserted into the hollow strainer body B1. The strainer body is equipped with the outlet opening A2 at its one end, the insertion opening A3 for inserting the filter which is located at the other end of the strainer body and of which the centerline agrees with the longitudinal axis of the strainer body and the inlet opening A1 which is located between these two openings and keeps the centerline crossing the longitudinal axis. The filter unit is equipped with the unit body 11 having a filter F and the blocking part 15 located at one end of the unit body for blocking the insertion opening. When the unit body is inserted into the strainer body from the insertion opening along the longitudinal axis, the circumferential part of the insertion opening and the outer periphery of the blocking part are engaged. The oil strainer is thus characterized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oil strainer, and more particularly to an oil strainer in which a filter unit is inserted and disposed inside a hollow strainer body.

  2. Description of the Related Art Conventionally, as an oil strainer for a vehicle such as an automobile, for example, as disclosed in Patent Document 1, a strainer body is constituted by a tubular body, and a filter unit is inserted and held from an inlet opening of the strainer body. Thus, it is known that the filter unit is disposed inside the strainer body.

By adopting such a configuration, the strainer body is manufactured as compared with the case where the strainer body is divided into two parts such as a split body and the substantially plate-like filter unit is sandwiched to join the divided bodies (for example, see Patent Document 2). In addition, the process of assembling the filter unit can be greatly simplified. In addition, it is necessary to ensure sufficient sealing performance at the joints between the divided bodies.
JP 2001-120920 A JP-A-8-121138

  However, when the center line of the inlet opening is substantially along the longitudinal axis (longitudinal center line) of the strainer body as in the oil strainer disclosed in Patent Document 1, there is no problem from the inlet opening. The filter unit can be inserted into the strainer body, but the center line of the inlet opening crosses the axis of the strainer body, such as when the strainer body is bent in the vicinity of the inlet and formed into an L shape. In this case, the filter unit cannot be inserted into the strainer body from the inlet opening. Therefore, in such a case, as shown in Patent Document 2, the actual situation is that the strainer main body is formed by splitting the split body into two parts and the filter unit is sandwiched to join the split bodies. .

  Therefore, the present invention basically provides an oil strainer in which the filter unit can be inserted and disposed in the strainer body even when the center line of the inlet opening intersects the axis of the strainer body. It was made as a purpose.

  Therefore, the oil strainer according to the present invention is an oil strainer in which a filter unit is inserted into a hollow strainer body, and the strainer body is provided on one end side of the strainer body. An outlet opening through which the fluid flows out, an insertion opening having a center line along the longitudinal axis of the strainer body at the other end of the strainer body, and a filter being inserted therein, and intersecting the longitudinal axis between these openings. The filter unit includes a unit main body having a filter and a closing portion that is formed on a terminal side of the unit main body and closes the insertion opening. And the unit main body is inserted into the strainer main body along the longitudinal axis from the insertion opening. And the outer peripheral portion of the closed portion are joined, it is obtained by it said.

  In this case, it is preferable that the side surface portion of the unit main body of the filter unit is fitted in a groove formed in the inner peripheral portion of the strainer main body.

  In the above case, it is more preferable that the outer peripheral portion of the closing portion of the filter unit is fitted to the peripheral edge portion of the insertion opening and is welded and joined at the fitting portion.

  In this case, more preferably, the peripheral edge portion of the insertion opening is, in order from the terminal side, the first inner peripheral surface, the second inner peripheral surface smaller than this, and the third inner peripheral surface smaller than this. And an inner peripheral step portion connected by an inclined surface between the first inner peripheral surface and the second inner peripheral surface, while the outer peripheral portion of the closing portion is the first outer peripheral surface in order from the terminal side And a second outer peripheral surface that is smaller than this, and a third outer peripheral surface that is smaller than this, and an outer peripheral step portion connected by an inclined surface between the second outer peripheral surface and the third outer peripheral surface, When the outer peripheral portion of the closing portion is fitted to the peripheral portion of the insertion opening, the outer peripheral step abuts against the inner peripheral step, and the second outer peripheral surface and the first inner peripheral surface An annular first gap is formed between them, and an annular second gap is formed between the third outer peripheral surface and the second inner peripheral surface. By portion where the outer peripheral step portion abuts on the inner peripheral step portion is melted, the outer peripheral portion of the closure portion is fusion bonded to the periphery of the insertion opening.

  In all the cases described above, a substantially flat baffle plate may be integrally provided outside the strainer body.

  According to the present invention, in addition to the outlet opening and the inlet opening, the insertion opening having the center line along the longitudinal axis of the strainer body is provided, so that the center line of the inlet opening is the longitudinal axis of the strainer body. Even when the unit body of the filter unit cannot be inserted from the inlet opening, the unit body can be inserted into the strainer body from the insertion opening along the longitudinal axis of the strainer body without any trouble. . And the peripheral part of the said insertion opening part and the outer peripheral part of the said closure part are joined in the state in which the unit main body was inserted in the strainer main body along the said longitudinal axis from the said insertion opening part. In this case, since it is joined only between the peripheral edge portion of the insertion opening and the outer peripheral portion of the closing portion, the strainer main body is formed of a split part and the filter unit is sandwiched to join the split parts. Compared to the structure, the joining operation is facilitated, and the area of the joined portion can be greatly reduced, so that more reliable sealing performance can be stably obtained.

  In this case, preferably, the side surface portion of the unit body of the filter unit is fitted in a groove formed in the inner peripheral portion of the strainer body, so that the insertion operation of the filter unit into the strainer body is easier and easier. The filter unit can be securely held in the strainer body.

In the above case, more preferably, the outer peripheral portion of the blocking portion of the filter unit is fitted to the peripheral portion of the insertion opening, and is welded and joined at the fitting portion.
The insertion opening can be more reliably closed, and the sealing performance of the joint portion between the insertion opening and the closing part can be more sufficiently ensured.

  In this case, preferably, when the outer peripheral portion of the closing portion is fitted to the peripheral portion of the insertion opening portion, the outer peripheral step portion of the closing portion hits the inner peripheral step portion of the insertion opening portion, and the abutted portion Is sandwiched between the annular first and second gaps. Therefore, when the portion where the outer peripheral stepped portion hits the inner peripheral step portion is melted and the outer peripheral portion of the closing portion is welded and joined to the peripheral portion of the insertion opening portion, the excess molten resin is the first and first 2 It collects in the gap and does not leak inside and outside. Thereby, it can prevent that the welding burr | flash protrudes in the inside and outside of a junction part.

  Also, in all of the above cases, by providing a substantially flat baffle plate on the outside of the strainer body, it is possible to reduce the man-hour for forming and assembling both separately, and the assembly cost when using a baffle plate It can greatly contribute to the reduction of.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is an overall perspective view of an oil strainer according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the strainer body of the oil strainer, and FIG. 3 is a perspective view illustrating a process of inserting a filter unit into the strainer body. 4 is a cross-sectional view of the oil strainer taken along line Y4-Y4 in FIG. 1, FIG. 5 is an explanatory view showing an enlarged main part of FIG. 4, and FIG. 6 is a line Y6-Y6 in FIG. FIG. 3 is a cross-sectional view of the oil strainer taken along the line.

  As shown in these drawings, the oil strainer S1 according to the present embodiment is tubular and is configured by disposing a filter unit U1 inside the strainer body B1. The oil strainer S1 is used, for example, disposed on the upper side of an oil pan attached to an engine or transmission of an automobile, and the upper portion of the strainer body B1 is bent obliquely to form an outflow pipe portion 2. The oil outlet side (downstream side) connecting flange 2f is integrally formed at the tip (upper end), and the central opening of the flange 2f constitutes an outlet opening A2 through which oil flows out.

  A large-diameter boss 3 is formed at the other end of the strainer body B1, and this terminal boss 3 is along the longitudinal axis Lb (longitudinal center line) of the strainer body B1 (preferably coincident). An opening A3 (insertion opening) having a center line L3 is provided. As shown in FIG. 3, the filter unit U1 is inserted into the strainer body B1 from the insertion opening A3 along the longitudinal axis Lb.

  Further, in the vicinity of the other end side of the strainer main body B1, an inflow pipe portion 1 is formed that is bent obliquely downward on the side of the terminal boss portion 3, and an opening at its tip (lower end) Constitutes an inlet opening A1 into which the gas flows. The center line L1 of the inlet opening A1 intersects the longitudinal axis Lb of the strainer body B1 between the outlet opening A2 and the insertion opening A3. Therefore, it is impossible to insert the filter unit U1 from the inlet opening A1 into the strainer body B1.

In the above configuration, the oil is sucked up from the lower side of the inflow pipe portion 1 in FIG. 4 through the inlet opening A1, filtered by the filter F, and then upward from the outflow pipe portion 2 through the outlet opening A2. It flows out (see broken line arrow c in FIG. 4).
The strainer body B1 is preferably a tubular body having a substantially circular cross-section, and more preferably is integrally formed by using, for example, an injection molding method using a synthetic resin material, and the filter unit U1 is an insertion opening of the strainer body B1. By being inserted from A3 along the longitudinal axis Lb, it is incorporated in the strainer body B1 (see FIG. 3).

  Thus, by providing the insertion opening A3 having the center line L3 along the longitudinal axis Lb of the strainer body B1 separately from the inlet opening A1 and the outlet opening A2, the center line L1 of the inlet opening A1 is provided. Even if the filter unit U1 crosses the longitudinal axis Lb of the strainer body B1 and the filter unit U1 cannot be inserted from the inlet opening A1, the filter unit U1 is obstructed from the insertion opening A3 along the longitudinal axis Lb of the strainer body B1. And can be inserted into the strainer body B1.

  As shown in FIGS. 3, 4, and 6, the filter unit U <b> 1 includes a unit main body 11 having a plane mesh filter F having a predetermined mesh and having an overall plate shape. The outer periphery of the filter F is supported by a frame-shaped filter frame 12, and a large number of crosspieces 13 are provided inside the filter frame 12 in a grid pattern to reinforce the substantially planar filter F.

  An oil inflow side (upstream side) terminal portion of the unit main body 11 is provided with a closing portion 15 that closes the insertion opening A3 in a state of being completely inserted into the strainer main body B1 from the insertion opening A3. The blocking portion 15 includes a vertical wall portion 16 that shields the insertion opening A3, and a peripheral wall portion 17 that extends from the outer edge of the vertical wall portion 16 so as to protrude toward the terminal side. The entire filter unit U1 is preferably integrally formed by using, for example, an injection molding method using a synthetic resin material. The filter F portion may be a metal mesh, and the filter frame 12, the crosspiece 13 and the closing portion 15 may be insert-molded using a synthetic resin material.

  As shown in FIGS. 2, 4, and 6, the inner peripheral portion of the strainer body B <b> 1 is preferably provided with a pair of fitting groove portions 5 along the longitudinal direction in a portion corresponding to the unit body 11 of the filter unit U <b> 1. When the filter unit U1 is inserted into the strainer main body B1, the left and right side portions of the unit main body 11 (that is, the left and right side portions of the filter frame 12) are fitted into the fitting groove portion 5. Inserted.

  Thus, the side part of the unit main body 11 is fitted and inserted into the fitting groove part 5 formed in the inner peripheral part of the strainer main body B1, thereby inserting the filter unit U1 into the strainer main body B1. It can be performed more easily and reliably, and the filter unit U1 can be held more stably in the strainer body B1.

  A concave portion 6 for engaging the tip end portion 11a of the unit main body 11 is formed inside the bent portion of the outlet pipe portion 2 of the strainer main body B1, and the filter unit U1 is completely inserted into the strainer main body B1. In this case, the unit main body tip 11a is engaged with the recess 6.

  7 and 8 show first and second modifications of the filter unit U1, respectively. In the first modification shown in FIG. 7, ribs that extend outward and extend in the longitudinal direction on the left and right side surfaces of the unit body 11 ′ of the filter unit U 1 ′ (that is, the left and right sides of the filter frame 12 ′). 12r is formed, and along this, along the longitudinal direction in which the rib 12r is fitted to the inner peripheral portion of the strainer main body B1 ′ in a portion corresponding to the unit main body 11 ′ of the filter unit U1 ′. A pair of fitting groove portions 5 'are provided. When the filter unit U1 ′ is inserted into the strainer body B1 ′, the ribs 12r of the left and right side surfaces of the unit body 11 ′ (that is, the left and right sides of the filter frame 12 ′) are in the fitting groove 5 ′. It is inserted and fitted.

  Further, in the second modified example shown in FIG. 8, a pair extending outwardly and extending in the longitudinal direction on the inner peripheral portion of the strainer main body B1 ″, above and below the portion corresponding to the unit main body 11 of the filter unit U1. The projections 7 are provided, and the pair of projections 7 form fitting groove portions 5 '' for fitting the left and right side portions of the unit body 11 (that is, the left and right side portions of the filter frame 12). When the filter unit U1 is inserted into the strainer body B1 ″, the left and right side portions of the unit body 11 (that is, the left and right side portions of the filter frame 12) are fitted into the fitting groove 5 ″. Inserted.

  When the unit main body 11 of the filter unit U1 is completely inserted into the strainer main body B1 along the longitudinal axis Lb of the strainer main body B1 from the insertion opening A3, as shown in FIGS. 4 and 5, the insertion opening A3 Are joined to the outer peripheral portion of the blocking portion 15 of the filter unit U1. Specifically, the peripheral wall portion 17 that forms the outer periphery of the closing portion 15 of the filter unit U1 is fitted to the peripheral edge portion of the insertion opening A3, and is welded and joined at the fitting portion using, for example, an ultrasonic welding method. Yes.

In this case, since it is joined only between the peripheral edge portion of the insertion opening A3 and the peripheral wall portion 17 of the blocking portion 15 of the filter unit U1, the strainer main body is divided into two parts and the filter unit is sandwiched between them. Compared to the conventional structure that joins bodies together, the joining work becomes easier, and the area of the joined portion can be greatly reduced, so that more reliable sealing performance can be obtained stably. .
Further, the peripheral wall portion 17 of the closing portion 15 of the filter unit U1 is fitted to the peripheral edge portion of the insertion opening A3 and welded and joined at the fitting portion, thereby more reliably closing the insertion opening A3, The sealability of the joint portion between the insertion opening A3 and the closing portion 15 can be more sufficiently ensured.

Next, a more specific structure of the joint portion between the insertion opening A3 and the closing portion 15 will be described.
As shown in more detail in FIG. 5, the inner peripheral portion of the terminal boss portion 3 is, in order from the upstream side, a first inner peripheral surface H1, a smaller second inner peripheral surface H2, and a smaller second inner peripheral surface H2. 3 is provided, and an inner peripheral stepped portion Hd is formed between the first inner peripheral surface H1 and the second inner peripheral surface H2 by an inclined surface.

  On the other hand, the peripheral wall portion 17 constituting the outer peripheral portion of the closing portion 15 includes, in order from the terminal side, a first outer peripheral surface K1, a second outer peripheral surface K2 smaller than this, and a third outer peripheral surface K3 smaller than this. And an outer peripheral stepped portion Kd connected by an inclined surface is formed between the second outer peripheral surface K2 and the third outer peripheral surface K3. The third outer peripheral surface K3 is located on the outer peripheral portion of the vertical wall portion 16.

  The first outer peripheral surface K1 and the third outer peripheral surface K3 of the peripheral wall portion 17 of the closing portion 15 are substantially the same as the first inner peripheral surface H1 and the third inner peripheral surface H3 of the terminal boss portion 3, respectively. The dimension is set so that the part 17 can be inserted into the terminal boss part 3 without hindrance and does not rattle in the inserted state.

  Further, the second outer peripheral surface K2 and the third outer peripheral surface K3 of the peripheral wall portion 17 are set smaller than the first inner peripheral surface H1 and the second inner peripheral surface H2 of the terminal boss portion 3, respectively. Therefore, when the peripheral wall portion 17 is completely inserted and fitted into the terminal boss portion 3, an annular shape is formed between the second outer peripheral surface K 2 of the peripheral wall portion 17 and the first inner peripheral surface H 1 of the terminal boss portion 3. A first gap portion J1 is formed, and an annular second gap portion J2 is formed between the third outer peripheral surface K3 of the peripheral wall portion 17 and the second inner peripheral surface H2 of the terminal boss portion 3. Yes.

  The welding is performed in a state where the outer peripheral step portion Kd of the peripheral wall portion 17 and the vicinity thereof and the inner peripheral step portion Hd of the terminal boss portion 3 and the vicinity thereof are abutted, and the abutting portion D is mainly melted. However, since the outer side and the inner side of the molten portion D are sandwiched between the annular first and second gap portions J1 and J2, excess molten resin is accumulated in the gap portions J1 and J2, and leaks into the inner side and the outer side. Never leave. That is, the welding burr does not protrude inside and outside.

Next, another embodiment of the present invention will be described. In the following description, components having the same configuration as those in the first embodiment and having the same function are denoted by the same reference numerals, and further description thereof is omitted.
FIG. 9 is a longitudinal sectional view of an oil strainer S2 according to the second embodiment of the present invention.
In the oil strainer S2 according to the second embodiment, the closed portion 25 of the filter unit U2 is formed in a plate shape, that is, the vertical wall portion is not composed of the vertical wall portion and the peripheral wall portion. This is different from the oil strainer S1 according to the first embodiment.

  A stepped portion 25d is formed on the outer peripheral portion of the plate-like closing portion 25, and a stepped receiver for holding the stepped portion 25d on the inner peripheral portion of the terminal portion 23 where the insertion opening A3 of the strainer body B2 is formed. A portion 23d is formed, and the closing portion 25 is welded and joined to the terminal portion 23 of the strainer body B2 in a state where the step portion 25d of the closing portion 25 is abutted against the receiving portion 23d. In this case, the laser welding method is suitable.

  In the configuration of the second embodiment, since it is not necessary to provide a boss portion in the insertion opening A3 of the strainer body B2, the oil strainer S2 can be made compact.

FIG. 10 is a perspective view showing a process of inserting the filter unit U3 into the strainer body B3 in the oil strainer S3 according to the third embodiment of the present invention.
In the oil strainer S3 according to the third embodiment, the strainer body B3 is formed of a tubular body having a substantially rectangular cross section, and the inlet pipe portion is provided on the inlet side (upstream side) of the strainer body B3. The difference from the oil strainer S2 according to the second embodiment is that the inlet opening A1 is formed directly at the inlet end of the straight pipe portion of the strainer body B3.

  Accordingly, the blocking portion 35 of the filter unit U3 is formed in a rectangular plate shape. In addition, ribs 32r extending outward and extending in the longitudinal direction are formed on the left and right side surfaces of the unit body 31 (that is, the left and right sides of the filter frame 32). In the inner peripheral portion, a pair of fitting groove portions 33 along the longitudinal direction for fitting the rib 32r is provided at a portion corresponding to the unit main body 31 of the filter unit U3. When the filter unit U3 is inserted into the strainer body B3, the ribs 32r on the left and right side surfaces of the unit body 31 (that is, the left and right sides of the filter frame 32) are fitted into the fitting groove 33. Inserted.

  In the configuration of the third embodiment, there is no need to provide a boss portion in the insertion opening A3 of the strainer main body B3, and no inlet pipe portion is provided on the inlet side of the strainer main body B3. Since it is formed directly at the inlet side end of the straight pipe portion of the strainer body B3, the oil strainer S3 becomes more compact and can be installed without any trouble even when the gap between the oil pan and the engine is narrow.

FIG. 11 is an overall perspective view of an oil strainer S4 according to the fourth embodiment of the present invention.
The oil strainer S4 according to the fourth embodiment is, for example, intended for the oil strainer S1 of the first embodiment, and a substantially flat baffle plate Pb is integrally provided outside the strainer body B1. . As is well known, the baffle plate Pb suppresses the oil ripples in the oil pan (not shown), and is set in a shape and a size suitable for the inner periphery of the oil pan.

  In this case, the baffle plate Pb can be set according to the layout in the oil pan, but in the present embodiment, for example, the baffle plate Pb has an angle that is substantially parallel or slightly inclined with respect to the longitudinal axis Lb of the strainer body B1. It is set to be substantially horizontal when installed in the oil pan. It is preferable that the baffle plate Pb is integrally formed when the strainer body B1 is formed.

Thus, by providing the baffle plate Pb integrally on the outside of the strainer body B1, the number of steps for forming and assembling the two separately can be reduced, and the assembly cost when using the baffle plate Bp can be reduced. .
In the example of FIG. 11, the oil strainer S <b> 1 of the first embodiment is targeted, but a baffle plate can be integrally provided on the outside of the strainer body in the same manner for the oil strainers of other embodiments.

  12 is a longitudinal sectional view of an oil strainer S5 according to a fifth embodiment of the present invention, FIG. 13 is a perspective view of a filter unit U5 according to the fifth embodiment, and FIG. 14 is according to the fifth embodiment. It is sectional drawing of the strainer main body B5.

As can be seen from FIGS. 12 and 14, in the oil strainer S <b> 5 according to the present embodiment, the strainer body B <b> 5 is formed into an integral tubular body by joining a pair of halves 47 and 48.
Thus, when a hollow body is obtained by abutting and joining a pair of halves, particularly as a method of forming a synthetic resin hollow body, the synthetic resin halves are abutted together, A method of obtaining a hollow molded product by joining the halves together by filling a molten resin into an internal passage formed along the periphery of the abutting portion or a passage formed between mold walls. Is known. Also, a method is known in which when the halves are joined together in this way, the passage is filled with molten resin in a mold for molding the halves.
By adopting such a method, it is possible to more stably ensure the joining strength between the halves and the sealing property of the abutting portion as compared with the case of conventional bonding or heat melting.

For example, Japanese Examined Patent Publication No. 2-38377 basically includes a male mold part and a female mold part for molding a set of halves in one mold, and these molds are provided in the other mold. A pair of mold structures provided with a female mold part and a male mold part opposite to the mold part are disclosed, and each half is molded (injected) simultaneously by using such a mold. After molding), one mold is slid with respect to the other so that the halves remaining in each female mold part are brought into contact with each other, and a molten resin is injected into the periphery of this contact part. A method (so-called die slide injection (DSI) method) in which both are joined is disclosed.
According to this DSI method, productivity can be greatly improved as compared with the conventional method in which the halves are molded and abutted and joined in completely separate processes.

  Further, for example, in Japanese Examined Patent Publication No. 7-4830, there is basically a mold that can be opened and closed, and one mold is predetermined with respect to the other. Each mold is provided with a molding part composed of at least one male molding part and two female molding parts in a repeating order of male / female / female in the rotational direction for each predetermined angle. A mold structure for rotary injection molding is disclosed, and by using such a mold, for each rotation (for example, forward / reverse inversion), each half is molded and a pair of abutted halves A rotary injection molding method (so-called die rotary injection (DRI) method) is disclosed in which joining is performed and a finished product is obtained for each rotational operation.

  More preferably, the strainer body B5 is formed by the DSI method or the DRI method, and is shown in FIGS. 12 and 14 by combining both the halves 47 and 48 together in a mold. As described above, an internal passage 49 is formed along the periphery of the abutting portion, and the halves 47 and 48 are joined to each other by filling the internal passage 49 with the molten resin 50.

In the present embodiment, the longitudinal axis of the strainer main body B5 has a curved shape with a gently curved central portion, and correspondingly, the unit body 41 of the filter unit U5 has a side surface shape with a gently curved central portion. It has. Since the degree of this bending is gentle, the filter unit U5 can be inserted into the strainer body B5 without hindrance.
As shown in FIG. 14, between the inner peripheral surface of the strainer main body B5 and the internal passage 49, preferably, a pair of fitting groove portions 43 along the longitudinal direction in a portion corresponding to the unit main body 41 of the filter unit U5. When the filter unit U5 is inserted into the strainer body B5, the left and right side surfaces of the unit body 41 (that is, the left and right sides of the filter frame 42) are fitted into the fitting groove 43. Inserted together.

  The upper and lower surfaces of the filter frame 42 are provided with notches 42c that open upward or downward at a plurality of predetermined locations, so that the fill frame 42 can be flexibly deformed to some extent in the vertical direction. Accordingly, when the filter unit U5 is inserted into the strainer body B5, the filter frame 42 can be smoothly inserted along the longitudinal axis of the strainer body B5. When the strainer body B5 is further bent in side view, the filter F can be flexibly deformed by providing a large number of notches 42c in the filter frame 42 even if the filter F is formed flat. The filter unit U5 can be easily inserted.

In addition, an inclined surface portion that is inclined up and down is formed at the distal end portion of the filter unit U5 (that is, the distal end portion 42a of the filter frame 42), and it is easy to engage with the groove portion formed on the inner surface of the strainer body B5. Yes.
Note that the blocking portion 45 of the filter unit U5 is formed in a substantially circular plate shape as in the second embodiment. Thereby, it is not necessary to provide a boss | hub part in insertion opening part A3 of strainer main body B5. Also, on the inlet side of the strainer main body B5, as in the second embodiment, no inlet pipe portion is provided, and the inlet opening A1 is directly connected to the inlet side terminal of the straight pipe portion of the strainer main body B5. Is formed. Therefore, a more compact oil strainer S5 is obtained.

In addition, although all the above embodiments were about the oil strainer in which the entire strainer body is formed in a substantially tubular shape, the present invention is also applicable to an oil strainer having a strainer body of another form. Can do. For example, even if only the inlet tube portion and the outlet tube portion are tubular, and the strainer body portion between them is, for example, a relatively flat shape, the third opening and the filter unit are formed in a shape corresponding thereto. Accordingly, the filter unit can be inserted into the strainer body from the third opening without any trouble.
Thus, it goes without saying that the present invention is not limited to the above-described embodiments, and various changes and improvements can be made without departing from the scope of the invention.

1 is an overall perspective view of an oil strainer according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the strainer main body of the said oil strainer. It is a perspective view which shows the insertion process in the strainer main body of a filter unit. It is sectional drawing of the said oil strainer along the Y4-Y4 line | wire in FIG. It is explanatory drawing which expands and shows the principal part of FIG. It is sectional drawing of the said oil strainer along the Y6-Y6 line | wire in FIG. It is a figure which shows the 1st modification of the said filter unit, and is sectional drawing equivalent to FIG. It is a figure which shows the 2nd modification of the said filter unit, and is sectional drawing equivalent to FIG. It is a longitudinal cross-sectional view of the oil strainer which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the process of inserting a filter unit in a strainer main body in the oil strainer which concerns on the 3rd Embodiment of this invention. It is a whole perspective view of the oil strainer which concerns on the 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the oil strainer which concerns on the 5th Embodiment of this invention. It is a perspective view of the filter unit concerning a 5th embodiment. It is sectional drawing of the strainer main body which concerns on 5th Embodiment.

Explanation of symbols

5, 33, 43 (strainer body) fitting groove 11, 31, 41 (filter unit) unit body 15, 25, 35, 45 (filter unit) closed part A1 inlet opening A2 outlet opening A3 insertion opening Part B1, B2, B3, B4, B5 Strainer body F Filters H1, H2, H3 First, second and third inner peripheral surfaces (of the terminal boss part) Hd Inner peripheral step parts of the terminal boss part J1, J2 1st, 2nd gap K1, K2, K3 (of closed part) 1st, 2nd, 3rd inner peripheral surface Kd (of closed part) Inner peripheral step part L2, L3 (outlet opening part, insertion opening part) ) Center line Kb Long axis of strainer body Pb Baffle plate S1, S2, S3, S4, S5 Oil strainer U1, U2, U3, U4, U5 Filter unit

Claims (5)

An oil strainer in which a filter unit is inserted and arranged inside a hollow strainer body,
The strainer body is provided on one end side of the strainer body and has an outlet opening through which oil flows out, and an insertion opening having a center line along the longitudinal axis of the strainer body on the other end side of the strainer body to insert a filter. And an inlet opening through which oil flows with a center line intersecting the longitudinal axis between the two openings,
The filter unit includes a unit main body having a filter, and a closing portion that is formed on the terminal side of the unit main body and closes the insertion opening.
In a state where the unit main body is inserted into the strainer main body along the longitudinal axis from the insertion opening, a peripheral portion of the insertion opening and an outer peripheral portion of the closing portion are joined.
Oil strainer characterized by that.   2. The oil strainer according to claim 1, wherein a side surface portion of the unit main body of the filter unit is fitted in a groove formed in an inner peripheral portion of the strainer main body.   3. The oil strainer according to claim 1, wherein an outer peripheral portion of the closed portion of the filter unit is fitted to a peripheral portion of the insertion opening and welded and joined at the fitting portion. The peripheral edge portion of the insertion opening has, in order from the terminal side, a first inner peripheral surface, a second inner peripheral surface smaller than the first inner peripheral surface, and a third inner peripheral surface smaller than the first inner peripheral surface. While comprising an inner peripheral step connected by a slope between the peripheral surface and the second inner peripheral surface,
The outer peripheral portion of the blocking portion has, in order from the terminal side, a first outer peripheral surface, a second outer peripheral surface smaller than the first outer peripheral surface, and a third outer peripheral surface smaller than the second outer peripheral surface. Provided with an outer peripheral step connected by an inclined surface between the outer peripheral surface,
When the outer peripheral portion of the closing portion is fitted to the peripheral portion of the insertion opening, the outer peripheral step abuts against the inner peripheral step, and the second outer peripheral surface and the first inner peripheral surface An annular first gap is formed between the third outer circumferential surface and the second inner circumferential surface, and an annular second gap is formed between the third outer circumferential surface and the second inner circumferential surface.
The outer peripheral portion of the closing portion is welded and joined to the peripheral portion of the insertion opening by melting the portion where the outer peripheral step is in contact with the inner peripheral step.
The oil strainer according to claim 3.   The oil strainer according to any one of claims 1 to 4, wherein a substantially flat baffle plate is integrally provided outside the strainer body.

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