JP4623468B2 - Oil strainer - Google Patents

Description

  The present invention relates to an oil strainer that is provided in, for example, an internal combustion engine of an automobile and filters oil circulating in the internal combustion engine.

  Conventionally, as this kind of oil strainer, for example, an oil strainer configured to form an oil inflow space by combining an upper divided body and a lower divided body divided into two in the vertical direction is known. (For example, see Patent Documents 1 and 2).

The lower divided body of these oil strainers of Patent Documents 1 and 2 is provided with a flat plate-shaped filter portion that filters oil and flows into the oil inflow space, and the outer peripheral portion of the filter portion is separated in the circumferential direction. In addition, engaging portions that protrude upward from the plurality of locations are provided. On the other hand, an oil outflow hole is formed in the upper wall portion of the upper divided body, and an engaged portion is formed at a location corresponding to the engaging portion on the outer peripheral portion of the upper wall portion. When manufacturing these oil strainers of Patent Documents 1 and 2, by combining the outer peripheral portion of the lower divided body and the outer peripheral portion of the upper divided body, the engaging portion is engaged with the engaged portion. Both parts are integrated. Thereby, for example, it is not necessary to prepare an expensive welding apparatus required when integrating by using a welding method, manufacturing management is simplified, and both divided bodies can be easily integrated.
JP 2002-106316 A JP 2002-153712 A

  However, in the oil strainers of Patent Documents 1 and 2, the plurality of engaging portions are separated from each other in the circumferential direction of the outer peripheral portion of the filter portion, and the engaged portions are also separated from each other corresponding to the engaging portions. . Therefore, the filter part of the lower divided body is engaged with the upper divided body only at locations apart from each other in the circumferential direction, and is not engaged with the upper divided body between adjacent engaging parts. . As a result, for example, due to a change in ambient temperature, oil pulsation, or the like, the gap between adjacent engaging portions in the outer peripheral portion of the filter portion is easily separated from the outer peripheral portion of the upper divided body, and the seal between the two divided bodies There is a possibility that the property will be lowered. If the sealing performance between the two divided bodies deteriorates, air will be sucked in from the mating part of both divided bodies, and oil suction failure will occur, and unfiltered oil will be sucked into the oil inflow space As a result, the lubrication performance deteriorates.

  The present invention has been made in view of such a point, and the object of the present invention is to configure an oil strainer by combining a divided body provided with a filter portion and a divided body provided with an oil outflow portion. It is possible to ensure the sealing property of the joint part of both divided bodies without using the welding method, to suppress poor oil suction and to suck in unfiltered oil, and to ensure high lubrication performance Is to make it.

In order to achieve the above object, according to the first aspect of the present invention, there is provided an oil strainer in which the first divided body and the second divided body are combined so as to form an oil inflow space. has a number of holes which constitute the network of oil filtration, a filter unit for flowing the oil filtered by the net-th upward Symbol oil inflow space, to extend from the outer periphery of the filter portion to the second split body side The filter part and the first wall part are integrally formed of a resin material, and the second divided body allows the oil that has flowed into the oil inflow space to flow out. An oil outflow portion, and a second wall portion connected to the oil outflow portion and extending to a location corresponding to the inner surface or the outer surface of the first wall portion, on the second wall portion side surface of the first wall portion, An annular engagement portion along the first wall portion Made, above the surface of the first wall portion side of the second wall portion, the engaging engaged portion of the annular engaging the engagement portion is formed, the one between the engaging portion and the engaged portion Consists of a ridge part, the other is a concave part into which the ridge part fits, and the engaging part and the engaged part are engaged with each other so that the first divided body and the second divided body are integrated. It is set as the structure which was made into.

  According to a second aspect of the present invention, in the first aspect of the present invention, an oil reservoir is formed outside the oil inflow space by an engagement portion between the engagement portion and the engaged portion by the first wall portion and the second wall portion. The structure is formed.

  In the invention of claim 3, in the invention of claim 1 or 2, the dividing direction of the first divided body and the second divided body is the vertical direction, and the first divided body is located below the second divided body. The second wall portion extends to a position corresponding to the inner surface of the first wall portion, and the lower end portion of the second wall portion and the filter portion of the first divided body are separated in the vertical direction.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the second wall portion is formed in a flange shape extending in a direction intersecting with the inner surface of the first wall portion, and is engaged with the distal end portion of the second wall portion. The part is formed.

  According to the first aspect of the present invention, the annular engagement portion is formed in the first divided body including the filter portion, and the annular engaged portion is formed in the second divided body including the oil outflow portion. Since the engaging portion and the engaged portion are engaged, the first divided body and the second divided body can be easily integrated without using a welding method. And in the state which the engaging part and the to-be-engaged part engaged, since this engaging part and to-be-engaged part have comprised the cyclic | annular form corresponding to the outer peripheral part of a filter part, the joining part of both division bodies Can be sealed over the entire circumference. As a result, air can no longer be sucked in from the mating part of both divided bodies and the oil suction failure can be suppressed, and unfiltered oil can be suppressed from being sucked into the oil inflow space, High lubrication performance can be ensured.

  According to the invention of claim 2, when the engagement state between the engaging portion and the engaged portion is weak due to the change over time, the oil level moves during use of the oil strainer and the two parts are divided. When the body mating part comes out of the liquid level, the oil in the oil reservoir part is sucked into the oil inflow space from between the engaging part and the engaged part, so that air is sucked into the oil inflow space. Can be prevented in advance.

  According to the invention of claim 3, for example, when the oil strainer is disposed in the oil pan storing the oil before filtration, the oil pan is deformed by an upward impact and is positioned on the lower side. When the upward force is applied to the first divided body, the first divided body is separated into the second divided portion by separating the filter portion of the first divided body and the lower end portion of the second divided body in the vertical direction. It can be easily displaced upward with respect to the body. Thereby, it can suppress that an excessive force is applied to both division bodies, and can make an oil strainer hard to break.

  According to the invention of claim 4, when the oil pan applies an upward force to the first divided body as described above, the second wall portion of the second divided body has a flange shape, so that the first The two wall portions are easily bent and deformed, and the engaged portion of the second wall portion can be easily detached from the engaging portion of the first wall portion. As a result, the oil strainer can be made more difficult to break.

  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.

(Embodiment 1)
FIG. 1 shows an oil strainer 1 according to Embodiment 1 of the present invention. The oil strainer 1 has a cylindrical shape extending in the substantially vertical direction as a whole, and is disposed in an oil pan P of an internal combustion engine of an automobile as shown in FIG. The liquid level of the oil in the oil pan P is indicated by a symbol L.

  The oil strainer 1 is divided in the vertical direction at the lower portion thereof, and is composed of an upper divided body 20 and a lower divided body 30. Both the divided bodies 20 and 30 are formed by molding a resin material. The upper divided body 20 has a cylindrical shape as a whole, and includes an upper end side portion 21 formed so as to extend in a substantially vertical direction, and an inclined portion 22 extending obliquely downward from the lower end portion of the upper end side portion 21. ing. A downstream end opening 23 connected to an intake port of an oil pump (not shown) of the internal combustion engine is formed at the upper end portion of the upper end side portion 21. This upper end side portion 21 constitutes an oil outflow portion.

  A mounting flange 24 that extends substantially horizontally toward the outside of the downstream end opening 23 is formed integrally with the peripheral edge of the downstream end opening 23 of the upper end side portion 21. The mounting flange 24 is formed with an insertion hole (both not shown) for the fastening member. The mounting flange 24 constitutes a mounting portion, and is fastened and fixed to the peripheral portion of the suction port of the oil pump by the fastening member. Thereby, the downstream end opening 23 and the suction port of the oil pump communicate with each other.

  The lower end surface of the upper divided body 20 is formed substantially horizontally and intersects the center line of the inclined portion 22. Therefore, the lower end portion of the upper divided body 20 is pointed. An upstream end opening 25 is formed in the lower end surface of the upper divided body 20. On the outer surface on the lower end side of the inclined portion 22, a protruding ridge portion 26 that protrudes from the outer surface and forms an annular shape that is continuous in the circumferential direction of the inclined portion 22 is formed. The protruding direction of the protruding portion 26 is a direction substantially orthogonal to the center line of the inclined portion 22. The cross-sectional shape of the protrusion 26 is formed in a substantially arc shape.

  The lower divided body 30 includes a filter portion 31 formed so as to cover the upstream end opening 25 of the upper divided body 20, and an annular shape extending obliquely upward from the outer peripheral portion of the filter portion 31 toward the upper divided body 20. It is comprised with the surrounding wall part 32 of this. The filter part 31 and the peripheral wall part 32 are integrally formed. The filter portion 31 has a large number of hole portions 31a constituting a mesh for oil filtration and is formed in a circular plate shape as a whole. The mesh of the filter portion 31 is formed when the lower divided body 30 is formed by a mesh forming surface provided in a mold (not shown) of the lower divided body 30.

  The peripheral wall portion 32 has a larger diameter than the inclined portion 22 of the upper divided body 20, is inclined in the same direction as the inclined portion 22, and extends to a location corresponding to the outer surface of the inclined portion 22. It faces the outer surface of the inclined portion 22. The lower divided body 30 is a first divided body, and the upper divided body 20 is a second divided body. Moreover, the said surrounding wall part 32 is a 1st wall part, and the said inclination part 22 is a 2nd wall part.

  A gap S <b> 1 is formed between the inner surface of the peripheral wall portion 32 and the outer surface of the inclined portion 22. A tapered surface 33 is formed on the upper end side of the inner surface of the peripheral wall portion 32 so as to increase in diameter upward. On the lower end side of the inner surface of the peripheral wall portion 32 with respect to the taper surface 33, a concave strip portion 36 having a shape into which the protruding portion 26 is fitted is formed. The concave portion 36 has an annular shape that is continuous in the circumferential direction of the peripheral wall portion 32. The cross-sectional shape of the concave portion 36 is formed in a substantially arc shape. The concave ridge portion 36 is an engaging portion formed on the surface of the peripheral wall portion 32 on the inclined portion 22 side, and the ridge portion 26 is engaged on the surface of the inclined portion 22 on the peripheral wall portion 32 side. It is a joint. The protruding portion 26 and the recessed portion 36 are for holding the divided bodies 20 and 30 in an integrated state and for sealing between the divided bodies 20 and 30.

  The circular arc shape of the cross section of the concave ridge portion 36 is set more gently than the circular arc shape of the cross section of the protruding ridge portion 26. Thus, in a state where the protrusion 26 is fitted into the recess 36 and the protrusion 26 and the recess 36 are engaged with each other, the protrusion 26 and the recess 36 extend over the entire circumference. As a result, the contact surface pressure is increased and they are in close contact with each other. As a result, the mating portion between the upper divided body 20 and the lower divided body 30 is sealed.

  In the state where the protrusion 26 and the recess 36 are engaged and the upper divided body 20 and the lower divided body 30 are integrated, an oil inflow space R is formed by both the divided bodies 20 and 30. In this state, a gap S <b> 2 is formed between the lower end portion of the inclined portion 22 of the upper divided body 20 and the upper surface of the filter portion 31 of the lower divided body 30.

  Next, the assembly procedure of the oil strainer 1 configured as described above will be described. First, after the upper divided body 20 and the lower divided body 30 are formed, the lower end portion of the upper divided body 20 is positioned inside the upper end portion of the lower divided body 30. At this time, since the tapered surface 33 is formed at the upper end of the lower divided body 30, the operation can be easily performed. Then, after setting the upper divided body 20 and the lower divided body 30 in a press-fitting machine (not shown), the lower end portion of the upper divided body 20 is brought into the lower divided body 30 by operating the press-fitting machine. At this time, the protruding portion 26 is elastically deformed so that the peripheral wall portion 32 of the lower divided body 30 is slightly enlarged in diameter, and the inclined portion 22 of the upper divided body 20 is elastically reduced in diameter. Deform. Thereafter, when the protrusion 26 is fitted into the recess 36, the peripheral wall 32 and the inclined portion 22 are restored, and the protrusion 26 and the recess 36 are engaged. Thereby, since it is possible to easily integrate the upper divided body 20 and the lower divided body 30 in a state of ensuring the sealing performance without using a welding method, it is not necessary to prepare an expensive welding apparatus, Manufacturing management can also be simplified.

  According to the oil strainer 1 configured as described above, when the mounting flange 24 is attached to the oil pump and the oil pump is operated, the oil in the oil pan P is filtered by the filter portion 31 and then the oil inflow space. Flows into R. The oil flowing into the oil inflow space R is sucked into the oil pump from the downstream end opening 23 of the upper divided body 20. At this time, as described above, since the mating portion of the upper divided body 20 and the lower divided body 30 is sealed over the entire circumference, air is not sucked from the mating portions of both the divided bodies 20 and 30. Oil suction failure can be suppressed, and unfiltered oil can be prevented from being sucked into the oil inflow space R. Thereby, high lubrication performance can be ensured in the internal combustion engine.

  In addition, a recessed strip portion may be formed on the inclined portion 22 of the upper divided body 20, and a protruding strip portion may be formed on the peripheral wall portion 32 of the lower divided body 30.

  Moreover, you may make it enlarge the area of the filter part 31 like the modifications 1 and 2 of Embodiment 1 shown in FIG.3 and FIG.4, respectively. In the first modification, on the lower end side of the inclined portion 22 of the upper divided body 20, an extending portion 27 extending from the inclined portion 22 in a substantially horizontal direction, and an annular wall extending downward from the outer edge portion of the extending portion 27. The part 28 is integrally formed. The extending portion 27 has a plate shape continuous in the circumferential direction of the inclined portion 22, and the outer edge portion has a circular shape. The annular wall portion 28 is inclined in substantially the same direction as the inclined portion 22. A protruding portion 26 is formed on the outer surface of the annular wall portion 28. On the other hand, the filter part 31 of the lower divided body 30 is formed in a larger circular plate shape than the filter part 31 of the first embodiment. The peripheral wall portion 32 of the lower divided body 30 is formed to have a larger diameter than the annular wall portion 28 of the upper divided body 20 and is inclined in the same direction as the annular wall portion 28. Furthermore, in the first modification, the holes 31a constituting the mesh of the filter part 31 extend in the same direction as the peripheral wall part 32, and the die cutting at the time of molding is facilitated.

  As shown in FIG. 4, in Modification 2 of Embodiment 1, the annular wall portion 28 of the upper divided body 20 extends substantially vertically, and correspondingly, the peripheral wall portion of the lower divided body 30. 32 also extends substantially vertically. In these modified examples 1 and 2, a concave ridge portion may be formed on the annular wall portion 28, and a ridge portion may be formed on the peripheral wall portion 32.

  In the first embodiment, the peripheral wall portion 32 of the lower divided body 30 is positioned outside the inclined portion 22 of the upper divided body 20. However, the present invention is not limited thereto, and the inclined portion 22 of the upper divided body 20 is not limited thereto. May be extended to a position corresponding to the outer surface of the peripheral wall portion 32 of the lower divided body 30, and the peripheral wall portion 32 may be positioned inside the inclined portion 22. In this case, a concave ridge portion may be formed on the inner surface of the inclined portion 22, and a ridge portion may be formed on the outer surface of the peripheral wall portion 32, or a ridge portion may be formed on the inner surface of the inclined portion 22, and the peripheral wall portion. A concave line portion may be formed on the outer surface of 32.

(Embodiment 2)
FIG. 5 shows an oil strainer 1 according to Embodiment 2 of the present invention. The oil strainer 1 according to the second embodiment is different from that according to the first embodiment in the shape of the lower portion of the upper divided body 20 and the shape of the lower divided body 30, and the other parts are the same. Different parts will be described in detail, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

  In the upper divided body 20 of the second embodiment, an extending portion 40 having a flange shape extending in a substantially horizontal direction from the lower end portion of the inclined portion 22 is formed. The extending portion 40 extends to a location corresponding to the inner surface of the peripheral wall portion 32 and is continuous in the circumferential direction of the inclined portion 22. A protrusion 26 is integrally formed at the distal end of the extension 40. The filter portion 31 of the lower divided body 30 is formed in a larger circular plate shape than that of the first embodiment. The peripheral wall portion 32 of the lower divided body 30 extends substantially vertically upward from the outer peripheral portion of the filter portion 31, and the extending direction of the peripheral wall portion 32 and the extending direction of the extending portion 40 intersect each other. . The concave portion 36 is formed in the vicinity of the upper end portion of the peripheral wall portion 32. In a state where the concave strip portion 36 and the protruding strip portion 26 are engaged, the lower end portion of the upper divided body 20 and the filter portion 31 are separated in the vertical direction. The extension 40 may extend in an umbrella shape.

  Also in the oil strainer 1 according to the second embodiment, the same operational effects as those of the first embodiment can be obtained.

  In addition, since the lower end portion of the upper divided body 20 and the filter portion 31 of the lower divided body 30 are separated in the vertical direction, for example, the oil pan P moves upward (indicated by a white arrow in FIG. 5). When an upward force is applied to the lower divided body 30 by receiving an impact and deforming as indicated by the phantom line, the engagement state between the protruding portion 26 and the recessed portion 36 is released, and the lower divided portion is released. The body 30 is easily displaced upward with respect to the upper divided body 20. Thereby, it is possible to suppress an excessive force from being applied to both divided bodies 20 and 30, and it is possible to make the oil strainer 1 difficult to break.

  Furthermore, in the second embodiment, since the protrusion 26 is formed at the tip of the flange-shaped extension 40, the oil pan P applies an upward force to the lower divided body 30 as described above. In this case, the extending portion 40 is easily bent and deformed, and the protruding portion 26 can be easily detached from the recessed portion 36, and the oil strainer 1 can be further prevented from being damaged.

  In addition, as in Modification 1 of Embodiment 2 shown in FIG. 6, the lower end portion of the inclined portion 22 protrudes downward from the extending portion 40, and a plurality of cutout portions 22b are circumferentially connected to the protruding portion 22a. You may make it form apart. In this modified example 1, when the oil pan P is deformed and the lower divided body 30 is displaced upward as described above and the filter part 31 comes into contact with the protruding part 22a of the inclined part 22, it is filtered by the filter part 31. It is possible to guide the oil from the notch 22b to the oil inflow space R, and a sufficient amount of oil can be ensured by the oil pump.

  Further, as in Modification 2 of Embodiment 2 shown in FIG. 7, the peripheral wall portion 32 of the lower divided body 30 protrudes downward from the filter portion 31, and a plurality of cutout portions 32b are circumferentially connected to the protruding portion 32a. You may make it form away in a direction. In the second modification, it is possible to avoid the oil pan P deformed upward as described above from coming into contact with the filter unit 31 and to guide the oil in the oil pan P from the notch 32b to the filter unit 31. The amount of oil sucked into the oil pump can be secured sufficiently.

  Moreover, you may make it form the level | step-difference part 40a below to the outer peripheral part of the extension part 40 of the upper side division body 20 like the modification 3 of Embodiment 2 shown in FIG. As a result, an oil reservoir 41 is formed outside the oil inflow space R by the peripheral wall 32 and the extension 40 in the vicinity of the engaging portion between the protrusion 26 and the recess 36. As a result, when the engagement state between the protruding portion 26 and the recessed portion 36 is weak due to the change over time, the oil as shown by the phantom line, for example, by turning the vehicle while the oil strainer 1 is used. When the liquid level L of the nozzle moves and the engaging portion between the protrusion 26 and the concave portion 36 comes out of the liquid level L, the oil in the oil reservoir 41 is sucked into the oil inflow space R from the engaging portion. Therefore, it is possible to prevent air from being sucked into the oil inflow space R. Similarly, in the first embodiment shown in FIGS. 1 to 4 and the second embodiment shown in FIGS. 5 to 7, the oil reservoir 41 is formed by extending the first wall portion above the engaging portion. be able to.

  Further, the upper divided body 20 may be divided into a plurality of parts, for example, on the oil pump side and the lower divided body 30 side. In addition, the shape of the upper divided body 20 may be a shape that extends linearly from the upper end side to the lower end side, or a shape having a plurality of bent portions.

  The shape of the oil strainer 1 may be a cylindrical shape with a polygonal cross section or an elliptical cylindrical shape in addition to the cylindrical shape.

  In the first and second embodiments, the case where the present invention is applied to the oil strainer 1 of the internal combustion engine has been described. However, the present invention is applied to an oil strainer attached to various power machines such as an automatic transmission of an automobile. Can be applied.

  Moreover, in the said Embodiment 1, 2, although the division | segmentation direction of the two division bodies 20 and 30 is made into the up-down direction, the division direction of the division bodies 20 and 30 is good also as a horizontal direction or a diagonal direction. .

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

1 is a side view of an oil strainer according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view of the oil strainer according to Embodiment 1 in use. 6 is a cross-sectional view of an oil strainer according to Modification 1 of Embodiment 1. FIG. FIG. 6 is a view corresponding to FIG. 3 according to a second modification of the first embodiment. FIG. 3 is a view corresponding to FIG. 2 according to the second embodiment. FIG. 6 is a view corresponding to FIG. 3 according to a first modification of the second embodiment. FIG. 9 is a view corresponding to FIG. 3 according to a second modification of the second embodiment. FIG. 9 is a view corresponding to FIG. 2 according to a third modification of the second embodiment.

1 Oil strainer 20 Upper divided body (second divided body)
21 Upper end side (oil outflow part)
22 Inclined part (second wall part)
26 Projection (engaged part)
30 Lower segment (first segment)
31 Filter part 32 Perimeter wall part (1st wall part)
36 Concave part (engagement part)
41 Oil reservoir R Oil inflow space

Claims (4)

An oil strainer in which the first divided body and the second divided body are combined so as to form an oil inflow space,
The first divided member has a number of holes which constitute the network of oil filtration, a filter unit for flowing the oil filtered by the net-th upward Symbol oil inflow space, the first from the outer periphery of the filter portion An annular first wall portion formed so as to extend to the two-part body side, and the filter portion and the first wall portion are integrally formed of a resin material,
The second divided body includes an oil outflow portion for letting out the oil that has flowed into the oil inflow space, and a second wall portion that continues to the oil outflow portion and extends to a location corresponding to the inner surface or the outer surface of the first wall portion. Prepared,
An annular engagement portion along the first wall portion is formed on the surface of the first wall portion on the second wall portion side, and the engagement surface is formed on the surface of the second wall portion on the first wall portion side. An annular engaged portion that engages with the joint portion is formed, and one of the engaging portion and the engaged portion is formed by a protruding portion, and the other is formed by a recessed portion that fits the protruding portion. The oil strainer is characterized in that the engaging portion and the engaged portion are engaged and the first divided body and the second divided body are integrated. The oil strainer according to claim 1,
An oil strainer, wherein an oil reservoir is formed by an engagement portion between an engagement portion and an engaged portion outside the oil inflow space by a first wall portion and a second wall portion. The oil strainer according to claim 1 or 2,
The dividing direction of the first divided body and the second divided body is the vertical direction, the first divided body is disposed below the second divided body, and the second wall portion corresponds to the inner surface of the first wall portion. To the point where
An oil strainer, wherein a lower end portion of the second wall portion and a filter portion of the first divided body are separated in a vertical direction. The oil strainer according to claim 3,
The second wall portion is formed in a flange shape extending in a direction intersecting with the inner surface of the first wall portion, and an engaged portion is formed at a tip portion of the second wall portion.

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