JP4749298B2 - Oil strainer - Google Patents

Description

The present invention is, for example, provided in an internal combustion engine of an automobile, relates to oil stray Na for filtering oil circulating in the internal combustion engine.

  Conventionally, as an oil strainer of this type, as disclosed in, for example, Patent Document 1, a strainer main body formed as a whole in a cylindrical shape and a filter provided inside the strainer main body. It has been known. The strainer body is formed by combining a first tubular body made of resin and a second tubular body extending in the center line direction. The mating portion of the first tubular body and the second tubular body is welded. An oil inflow hole is formed in the first tubular body, and an oil outflow hole is formed in the second tubular body. Then, after the oil sucked from the oil inflow hole of the first tubular body is filtered by passing through the filter, it flows out from the oil outflow hole of the second tubular body to the outside.

Further, when two resin members are welded as described above, welding burrs are generated. As a countermeasure when this welding burr occurs, for example, in Patent Document 2, when welding a cylindrical case and a cover that covers the opening of the case, the case and the welded portion of the cover are closer to the inside of the case. Further, it is disclosed that a welding burr accommodating portion for accommodating a welding burr is provided. As a result, when the welding burr is detached from the welded part due to vibration or impact, the welded burr can be accommodated in the welded burr accommodating part, and the welded burr is not dropped into the case.
Japanese Patent Laid-Open No. 2002-210310 Japanese Patent Laid-Open No. 2002-248685

  By the way, in patent document 2, the burr | flash accommodating part is provided only in the case inner side rather than the welding part, ie, the centerline direction one side of a case. Therefore, when the first tubular body and the second tubular body constituting the oil strainer of Patent Document 1 are welded, when the burr accommodating portion is formed by applying the technique disclosed in Patent Document 2, the first tubular body is formed. The burr accommodating portion is formed only on one side in the center line direction from the welded portion of the body and the second tubular body. For this reason, the welding burr formed so as to extend from the welded portions of the first tubular body and the second tubular body toward the other side in the center line direction is not accommodated in the welded burr accommodating portion and is detached from the welded portion. It may be dropped into the oil storage space. When this weld burr is sucked together with oil by the oil strainer, the filter is likely to be clogged.

  The present invention has been made in view of such a point, and an object of the present invention is to form a strainer main body by welding the first tubular body and the second tubular body to the center of the tubular body. Even if welding burrs are generated so as to extend to both sides in the linear direction, these welding burrs are prevented from falling off from the strainer body to prevent clogging of the filter.

In order to achieve the above object, according to the first aspect of the present invention, as an invention of an oil strainer, a strainer body formed by welding one end side in the center line direction of the first tubular body and one end side in the center line direction of the second tubular body. An inner side of the first tubular body, the inner diameter of the first tubular body is set to be larger than the outer diameter of the second tubular body, and one end of the first tubular body. A first welded portion is provided on the inner peripheral side of the side, and a first space component is provided on one side and the other side of the first tubular body from the first welded portion, respectively, A second welded portion to be welded to the first welded portion is provided on the outer peripheral side of one end side of the second tubular body, and one side in the center line direction of the second tubular body from the second welded portion and On the other side, a welding burr accommodating portion is formed together with the first space constituting portion. Space structure portions are provided respectively, the first welded portion and the second welding portion are each configured that are positioned to protrude radially outward from the body wall portion of the first tubular member and second tubular member to.

According to a second aspect of the present invention, in the first aspect of the present invention, the filter is formed integrally with one of the first tubular body and the second tubular body.

According to a third aspect of the present invention, in the first aspect of the present invention, the strainer main body and the filter are separated from each other, and the filter is provided with a clamping portion that is clamped between the first tubular body and the second tubular body. The configuration is as follows .

  According to the first aspect of the present invention, the strainer body can be obtained by welding the first welded portion of the first tubular body and the second welded portion of the second tubular body. A welding burr accommodating portion can be formed by the first space constituting portion and the second space constituting portion on one side in the center line direction from the first welded portion and the second welded portion of the strainer main body, and also on the other side. A weld burr accommodating portion can be formed. As described above, since the welding burr accommodating portions can be formed on both sides in the center line direction of the first welding portion and the second welding portion, the welding burrs generated so as to extend from the first welding portion and the second welding portion to both sides in the center line direction. Can be accommodated in the welding burr accommodating portion. As a result, the welding burr does not fall off from the strainer body, so that it is not sucked into the oil strainer together with the oil, and the clogging of the filter can be prevented.

Moreover , since the 1st welding part and the 2nd welding part protrude radially outward rather than the main body wall part of the 1st tubular body and the 2nd tubular body, the 1st welding part and the 2nd welding part are carried out at the time of welding operation | work. Can be easily and reliably held by the jig from the outside of the first tubular body and the second tubular body, and the force by the jig can be sufficiently transmitted to the first welded portion and the second welded portion. Thereby, a 1st welding part can be firmly pressed on a 2nd welding part, and both can be welded reliably.

According to the invention of claim 2 , since the filter is integrally formed on one of the first tubular body and the second tubular body, the number of parts constituting the oil strainer can be reduced, and the number of assembly steps can be reduced.

According to the invention of claim 3 , when the filter is separated from the strainer main body, the first tubular body and the second tubular body are simply integrated by welding, and the sandwiching portion of the filter is sandwiched between both tubular bodies. Thus, the filter can be fixed to the strainer body .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows an oil strainer 1 according to an embodiment of the present invention. The oil strainer 1 includes a strainer body 12 and a filter 3 (shown in FIG. 2). For example, although not shown, the oil strainer 1 is disposed in an oil pan that constitutes an oil storage space of an internal combustion engine of an automobile. Is attached. The strainer body 12 has a cylindrical shape extending substantially in the vertical direction in a state of being attached to the cylinder block, and is divided at an intermediate position in the vertical direction, and constitutes the lower side with the outflow side tubular body 10 constituting the upper side thereof. It consists of an inflow side tubular body 11. The outflow side tubular body 10 and the inflow side tubular body 11 are made of resin. The vertical dimension of the outflow side tubular body 10 is set to be longer than the vertical dimension of the inflow side tubular body 11, and the dividing surface of the strainer body 12 is located on the lower side of the strainer body 12. In the state where the filter 3 is arranged inside the outflow side tubular body 10, the lower end side that is one end side in the center line direction of the outflow side tubular body 10 and the upper end that is one end side in the center line direction of the inflow side tubular body 11. The side is welded. The outflow side tubular body 10 is a first tubular body, and the inflow side tubular body 11 is a second tubular body.

  A bent portion 13 that is bent at a substantially right angle is formed at the upper portion of the outflow side tubular body 10. The upper end opening of the outflow side tubular body 10 is connected to an inlet (not shown) of an oil pump of the engine, and constitutes an oil outlet 10a through which oil in the strainer body 12 flows out. Yes. A flange 14 is formed at the upper end of the outflow side tubular body 10 so as to surround the oil outlet 10a. The flange 14 is formed with an insertion hole 14a through which a fastening member (not shown) for fastening to the cylinder block is inserted, and a groove 14b into which an O-ring (not shown) as a seal member is fitted. It is formed so as to surround the oil outlet 10a. The lower side of the bent portion 13 of the outflow side tubular body 10 extends substantially linearly. The lower side of the outflow side tubular body 10 from the substantially central portion in the vertical direction is a filter housing portion 15 that houses the filter 3, and is higher than the upper portion of the outflow side tubular body 10 corresponding to the outer diameter of the filter 3. The diameter has been expanded.

  A main body wall portion 10 b of the outflow side tubular body 10 is configured by the filter housing portion 15 and a portion above the filter housing portion 15. On the lower end side of the main body wall portion 10b, a large-diameter portion 16 larger in diameter than the main body wall portion 10b is connected, and as shown in FIG. A stepped portion 10 c is formed corresponding to the formation site of the large diameter portion 16. In addition, a first surface 10d extending in the radial direction and a second surface 10e extending in the center line direction are formed on the outer peripheral surface of the main body wall portion 10b corresponding to the shape of the large-diameter portion 16. The large diameter portion 16 is located concentrically with the filter housing portion 15.

  As shown in FIG. 3, an upper stepped portion 16a and a lower stepped portion 16b positioned downward from the upper stepped portion 16a are formed on the inner peripheral side of the large diameter portion 16, and these steps are formed. A portion between the portions 16a and 16b is a welded portion 16c (shown only in FIG. 3). The upper step portion 16a and the lower step portion 16b are first space constituting portions, and the welding portion 16c is a first welding portion.

  On the other hand, as shown in FIG. 2, the inflow side tubular body 11 includes a main body wall portion 11b and an outer cylinder portion 30 formed so as to surround the upper end side of the main body wall portion 11b. The main body wall portion 11b has a cylindrical shape extending substantially linearly. The outer diameter of the main body wall portion 11b is smaller than the filter housing portion 15 of the outflow side tubular body 10, and has a loose taper shape that decreases in diameter toward the lower side. The lower end opening of the main body wall 11b constitutes an oil inlet 11a (shown in FIG. 3) for allowing the oil in the oil pan to flow into the oil strainer. As shown in FIG. 2, an annular portion 11c that protrudes radially outward and extends in the circumferential direction is formed on the outer peripheral surface of the upper end portion of the main body wall portion 11b. The outer cylinder part 30 is integrally formed at the projecting direction tip of the annular part 11c. A gap is provided between the outer cylinder part 30 and the main body wall part 11b. In this gap, a plurality of ribs 32 connecting the outer cylinder part 30 and the main body wall part 11 b are arranged at intervals in the circumferential direction of the outer cylinder part 30.

  The outer diameter of the outer cylinder portion 30 is set smaller than that of the large diameter portion 16. The center line Y of the outer cylinder part 30 is substantially in agreement with the center line of the main body wall part 11b. As shown in FIG. 3, an upper stepped portion 30a and a lower stepped portion 30b positioned downward from the upper stepped portion 30a are formed on the outer peripheral surface of the outer cylindrical portion 30, and these stepped portions 30a are formed. , 30b is a welded portion 30c (shown only in FIG. 3). The upper step portion 30a and the lower step portion 30b are second space constituting portions, and the welding portion 30c is a second welding portion. The upper step part 30a of the outer cylinder part 30 is positioned so as to face the upper step part 16a in the welding step described later, and the lower step part 30b of the outer cylinder part 30 is similarly located on the lower side. It is positioned so as to face the step portion 16b.

  At the upper end portion of the outer cylinder portion 30, a filter pressing portion 30d that protrudes upward and extends in an annular shape is formed. The cross-sectional shape of the filter pressing portion 30d is a pointed shape as it goes upward, and the upper end portion is located above the upper end portion of the main body wall portion 11b. At the lower end portion of the outer cylinder portion 30, a flange portion 30e that protrudes radially outward and extends in the circumferential direction is formed.

  The filter 3 has a bottomed cylindrical shape that extends along the center line of the filter housing portion 15 as a whole, and is disposed in the filter housing portion 15 so that the bottom wall portion side is located on the upper side. On the bottom wall portion and the peripheral wall portion of the filter 3, a mesh portion 3a constituting a mesh for oil filtration is formed. On the opening side opposite to the bottom wall portion of the filter 3, a flange 3b extending outward in the radial direction is formed. The outer diameter of the flange 3 b is set to be larger than the inner diameter of the filter housing portion 15 and slightly smaller than the inner diameter of the large diameter portion 16. The flange 3b fits into the stepped portion 10c of the outflow side tubular body 10, and is sandwiched in the thickness direction by the stepped portion 10c and the filter pressing portion 30d. Thereby, the filter 3 is fixed to the strainer body 12. This flange 3b is a clamping part. The mesh part 3a is provided with a plurality of ribs 3c. The ribs 3c, the mesh part 3a, and the flange 3b are integrally formed of a resin material.

  Next, the manufacturing method of the oil strainer 1 comprised as mentioned above is demonstrated. First, the outflow side tubular body 10 and the inflow side tubular body 11 are formed by an injection molding method. This is the first tubular body forming step and the second tubular body forming step of the present invention. The filter 3 is also formed by an injection molding method.

  Then, it moves to the welding process which welds and integrates the outflow side tubular body 10 and the inflow side tubular body 11 by an ultrasonic welding method. As shown in FIG. 3, the ultrasonic welding machine A used at this time has a receiving jig A <b> 1 that holds the outflow side tubular body 10, a horn A <b> 2 that holds the inflow side tubular body 11, and a horn A <b> 2. A vibration exciter A3 that vibrates with sound waves is provided, a receiving jig A1 is disposed on the lower side, and a horn A2 and a vibration exciter A3 are disposed on the upper side.

  First, the filter 3 is inserted from the large diameter portion 16 side of the outflow side tubular body 10. When the flange 3b of the filter 3 reaches and fits the stepped portion 10c of the outflow side tubular body 10, the filter 3 is positioned by the stepped portion 10c. And the outflow side tubular body 10 is hold | maintained at the receiving jig | tool A1 in the state which the large diameter part 16 side faced upwards. Further, the inflow side tubular body 11 is held by the horn A2 with the outer cylinder part 30 side facing downward. That is, in the welding process, the positional relationship between the outflow side tubular body 10 and the inflow side tubular body 11 is upside down with respect to the use state of the finished product, and the outflow side tubular body 10 is positioned on the lower side, The inflow side tubular body 11 is located on the upper side. At this time, the center line of the large-diameter portion 16 and the center line of the outer cylinder portion 30 coincide with each other.

  In the state where the outflow side tubular body 10 is received and held by the jig A1, the large diameter portion 16 protrudes outward in the radial direction from the main body wall portion 10b, so that it is formed corresponding to the large diameter portion 16. The receiving jig A1 is in contact with the first surface 10d and the second surface 10e. At this time, the receiving jig A1 may not be brought into contact with the outflow side of the first surface 10d of the main body wall 10b. Similarly, since the outer cylindrical portion 30 of the inflow side tubular body 11 protrudes radially outward from the main body wall portion 11b, the horn A2 is in contact with the flange portion 30e side of the outer cylindrical portion 30.

  When the horn A2 is moved downward, the outer cylindrical portion 30 of the inflow side tubular body 11 is inserted into the large diameter portion 16 of the outflow side tubular body 10, and eventually the welded portion of the outflow side tubular body 10 is obtained. 16c and the welding part 30c of the inflow side tubular body 11 contact. At this time, the upper step part 16a of the outflow side tubular body 10 and the upper step part 30a of the inflow side tubular body 11 face each other, and the lower step part 16b of the outflow side tubular body 10 and the lower side of the inflow side tubular body 11 The side step part 30b faces each other.

  Thereafter, the horn A2 is pressed downward and is vibrated ultrasonically by the vibrator A3, and the welded portion 16c of the outflow side tubular body 10 and the welded portion 30c of the inflow side tubular body 11 are melted by frictional heat. As the welded portions 16c and 30c melt, the inflow side tubular body 11 moves downward. As a result, as shown in FIG. 4, a space is formed by the upper and lower step portions 16a and 30a, which becomes the outflow side welding burr accommodating portion S1 located on the outflow side, and the lower step portions 16b and 30b. A space is also formed by this, and this becomes the inflow side welding burr accommodating portion S2 located on the inflow side. That is, the outflow side welding burr accommodating portion S1 and the inflow side welding burr accommodating portion S2 are respectively formed on the outflow side and the inflow side on both sides in the vertical direction of the welding portions 16c and 30c. When the downward movement distance of the inflow side tubular body 11 reaches a predetermined distance, the filter pressing portion 30d hits the flange 3b of the filter 3 so that the flange 3b is brought into contact with the outflow side tubular body 10 and the inflow side tubular body 11. The sandwiched state is entered, and the vibration of the vibrator A3 is stopped, and the downward movement of the horn A2 is stopped.

  In the welding step, a welding burr extending toward the outflow side from the welding portions 16c and 30c of the outflow side tubular body 10 and the inflow side tubular body 11 and a welding burr extending toward the inflow side are generated. The welding burr extending toward the outflow side is accommodated in the outflow side welding burr accommodating portion S1, and the welding burr extending toward the inflow side is accommodated in the inflow side welding burr accommodating portion S2.

  As described above, according to the oil strainer 1 according to this embodiment, the outflow side burr storage portion S1 and the inflow side burr storage portion S2 can be formed on the outflow side and the inflow side of the welded portions 16c and 30c, respectively. Thereby, the welding burr | flash produced | generated so that it may extend to the outflow side and inflow side from the welding parts 16c and 30c can be accommodated in the outflow side and inflow side welding burr | flash accommodating part S1, S2, respectively. As a result, the welding burr does not fall off from the strainer body 12, and therefore, the filter 3 is prevented from being clogged without being sucked into the oil strainer 1 together with the oil.

  In addition, since the welded portion 16c is positioned so as to protrude radially outward from the main body wall portion 10b of the outflow side tubular body 10, the vicinity of the welded portion 16c is located outside the first tubular body 10 in the welding step. Can be easily and reliably held by the receiver A1 via the first surface 10d and the second surface 10e, and the welded portion 30c protrudes radially outward from the main body wall portion 11b of the inflow side tubular body 11. Therefore, the vicinity of the welded portion 30c can be easily and reliably held by the horn A2 via the outer flange portion 30e of the second tubular body 11. Thereby, the pressing force by the receiver A1 and the horn A2 can be sufficiently transmitted to the welding portions 16c and 30c. In addition to this, since the receiving jig A1 is in contact with the second surface 10e which is the outer peripheral surface of the large diameter portion 16, it is possible to prevent the welded portion 16c from being displaced outward and escaping. The rigidity of the welded portion 30c is increased by connecting the main body wall portion 11b of the inflow side tubular body 11 and the outer cylindrical portion 30 with a plurality of ribs 32, and the welded portion 30c is prevented from escaping and escaping. it can. By the above, the welding part 16c of the outflow side tubular body 10 can be firmly pressed on the welding part 30c of the inflow side tubular body 11, and the welding parts 16c and 30c can be reliably welded.

  Further, by simply welding the outflow side tubular body 10 and the inflow side tubular body 11, the filter 3 can be fixed to the strainer body 12 by sandwiching the flange 3 b of the filter 3 between the tubular bodies 10 and 11.

  In this embodiment, the annular portion 11c of the inflow side tubular body 11 is positioned on the outflow side with respect to the welding portion 30c. However, the present invention is not limited to this, and the annular portion 11c is located at the same position as the welding portion 30c in the center line direction. May be provided. Thereby, the welding part 30c is supported from the inner side by the annular part 11c, and the rigidity can be improved. As a result, in the welding process, it is possible to prevent the welded portion 30c from being displaced inward and escaping.

  In this embodiment, the strainer body 12 and the filter 3 are separated from each other. However, the present invention is not limited to this. For example, as in the modification shown in FIG. It may be formed integrally with 11b. Thereby, the number of parts which comprise oil strainer 1 can be decreased, and an assembly man-hour can be reduced. Although not shown, the filter 3 may be integrally formed with the outflow side tubular body 10.

  In this embodiment, the outflow side tubular body 10 and the inflow side tubular body 11 are ultrasonically welded. However, the present invention is not limited to this, and spin welding may be performed. In this case, the outflow side tubular body 10 is fixed, and the inflow side tubular body 11 is pressed against the outflow side tubular body 10 and rotated in the same manner as in the ultrasonic welding method. The welding burr generated at this time can also be accommodated in the welding burr accommodating portions S1 and S2.

  Further, the strainer 1 can be used not only as an internal combustion engine but also as an oil filtration part for an automatic transmission of an automobile or other power machine.

As described above, the oil strainer according to the present invention, for example, that is suitable to arrange in the oil pan of an internal combustion engine.

It is a perspective view of the oil strainer which concerns on embodiment of this invention. It is sectional drawing in the II-II line of FIG. It is a figure equivalent to Drawing 2 showing the state just before welding an outflow side tubular body and an inflow side tubular body. It is a figure equivalent to Drawing 3 showing the state where the outflow side tubular body and the inflow side tubular body were welded. It is a figure equivalent to FIG. 2 which concerns on the modification of embodiment.

DESCRIPTION OF SYMBOLS 1 Oil strainer 2 Strainer main body 3 Filter 10 Outflow side tubular body (1st tubular body)
10b Main body wall 11 Inflow side tubular body (second tubular body)
11b Main body wall part 16 Large diameter part 16a, 16b Step part (1st space structure part)
16c Welding part (first welding part)
30 outer cylinder part 30a, 30b level | step difference part (2nd space structure part)
30c Welding part (second welding part)
30e collar (clamping part)
A welding machine S1 outflow side welding burr storage part S2 inflow side welding burr storage part

Claims (3)

An oil strainer in which a filter is provided inside a strainer body in which one end side in the center line direction of the first tubular body and one end side in the center line direction of the second tubular body are welded,
An inner diameter on one end side of the first tubular body is set larger than an outer diameter on one end side of the second tubular body,
A first welded portion is provided on the inner peripheral side of the one end side of the first tubular body, and a first space configuration is provided on one side and the other side in the center line direction of the first tubular body from the first welded portion. Each part is provided,
A second welded portion welded to the first welded portion is provided on the outer peripheral side of one end side of the second tubular body, and one side in the center line direction of the second tubular body from the second welded portion. And on the other side, the second space constituting part that constitutes the welding burr accommodating part together with the first space constituting part is provided , respectively .
The oil strainer according to claim 1, wherein the first welded portion and the second welded portion are positioned to project radially outward from the main body wall portions of the first tubular body and the second tubular body, respectively . The oil strainer according to claim 1 ,
An oil strainer, wherein the filter is integrally formed with one of the first tubular body and the second tubular body. The oil strainer according to claim 1 ,
The strainer body and the filter are separated.
An oil strainer, wherein the filter is provided with a clamping portion that is clamped between the first tubular body and the second tubular body.

Images