JPH09290109A - Oil strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil strainer with no possibility of increased resistance to circulation of oil even when it is made thin. SOLUTION: This oil strainer comprises an upper body 1 which has a discharge hole 5 and is arranged on a constitution part side of an automobile transmission, a lower body which has an inlet hole and is arranged on an oil pan side, a filter which divides an inner space formed by the upper body and the lower body and a holding frame which places the filter in the inner space and holds it on the lower body side. In addition, in the upper body, a plurality of recessed parts receiving projections existing on the constitution part side are projected toward the inside as projected walls 7a-7n and in the holding frame, radial ribs 11 extending radially around the discharge hole of the upper body as a center and crossing ribs 12o-12k extending in crossing-like shape between the radial ribs are provided and the crossing ribs are positioned on the upstream side and the downstream side of each projected wall by avoiding each projected wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil strainer used for a transmission of an automobile.

[0002]

2. Description of the Related Art As a conventional oil strainer of this kind,
For example, there is one disclosed in Japanese Utility Model Publication No. 6-41812. Although not specifically shown, the conventional oil strainer is mainly composed of an upper body, a lower body, and a filter, and the upper body and the lower body are box-shaped bodies having a lattice-like opening shape that allows passage of oil. Molded into a plurality of elastic locking claws and a shaft portion integrally formed on the upper body side, and a plurality of stepped portions and a boss portion integrally formed on the lower body side. By locking the claw to the step and fitting each shaft to the boss,
The upper body and lower body can be temporarily assembled.

Further, the filter is constructed such that it is superposed on the outer side of the temporarily assembled upper body and lower body, and its entire peripheral edge is joined with the flange portion of each body by an injection molding cover.

Therefore, under such a conventional oil strainer, the upper body and the lower body are provided with a lattice-like opening shape that allows the passage of oil, and a filter is provided on the outside of each body through an injection molding cover. Due to the fact that the composition that polymerizes is adopted, the expansion of the filtration area by the filter can be expected.

[0005]

However, in recent years, not only downsizing of the entire transmission but also downsizing of its vertical dimension has been strongly demanded in order to secure a ground clearance, so that these requirements are met. For this reason, if the conventional oil strainer described above is made smaller and thinner, for example, the structure in which the filter is polymerized on the outside is adopted, and the 雛 naturally reduces the oil flow passage area and increases the flow resistance. There is a good chance that it will happen.

Further, in the control valve which is one of the constituent parts of the transmission, the bolt head or the like as its fixing means is inadvertently projected on the oil strainer side,
Without a structure for receiving the protrusions such as the bolt head, the oil strainer cannot be made thin.

[0007]

SUMMARY OF THE INVENTION The present invention was developed to meet the demands of the field, and the invention according to claim 1 has an outlet and is provided on a component side of a transmission. An upper body to be arranged, a lower body having an inflow port arranged on the oil pan side, a filter for partitioning an internal space defined by the upper body and the lower body into an outflow passage and an inflow passage, and the filter. A holding frame that holds the lower body side in the internal space, the upper body is provided with a plurality of recesses for receiving the projections present on the component side of the transmission on its wall surface as a convex wall and projecting inward. The holding frame is provided with radial ribs radially extending around the outlet of the upper body and cross ribs extending crosswise between the radial ribs in an inner region of the base frame. The avoiding each convex wall adopts the configuration that is positioned on the upstream side and downstream side of each of the convex wall.

According to a second aspect of the invention, an upper body having an outflow port and disposed on the component side of the transmission, a lower body having an inflow port and disposed on the oil pan side, and an upper body are provided. A filter that divides the inner space defined by the lower body into an outflow passage and an inflow passage, and a holding frame that holds the filter on the lower body side in the inner space, and the upper body has a wall on which the transmission of the transmission is attached. A plurality of depressions for receiving the protrusions existing on the component side are provided as a convex wall and protrude inward as a convex wall, and the holding frame has a radial rib extending radially in the inner region of the base frame around the outlet of the upper body. , A cross rib extending in a cross shape between the radial ribs is provided, and the cross rib is positioned on the upstream side of the convex wall, avoiding the convex wall closest to the outflow port. It was.

According to a third aspect of the present invention, an upper body having an outflow port and disposed on the component side of the transmission, a lower body having an inflow port and disposed on the oil pan side, and an upper body are provided. A filter that divides the inner space defined by the lower body into an outflow passage and an inflow passage, and a holding frame that holds the filter on the lower body side in the inner space, and is located at a short distance from the outlet of the upper body. And a range in which the cross-sectional area of the outflow passage when viewed in a circumferential cross-section centered on the outflow port decreases toward the outflow port side,
The upper body has a range in which the cross-sectional area of the outflow passage increases toward the outflow side at a distance from the outflow port, while the upper body has a plurality of projections on the wall surface that receive the protrusions on the component side of the transmission. The holding frame is formed by projecting inwardly as a convex wall, and the holding frame extends radially in the inner region of the base frame with the radial ribs centering on the outlet of the upper body and the crossing between the radial ribs. Cross ribs are provided, and in the range where the cross-sectional area of the outflow passage decreases toward the outlet side, the cross ribs are located on the upstream side and the downstream side of each convex wall while avoiding each convex wall. did.

According to a fourth aspect of the present invention, an upper body having an outflow port and disposed on the component side of the transmission, a lower body having an inflow port and disposed on the oil pan side, and an upper body are provided. A filter that divides the inner space defined by the lower body into an outflow passage and an inflow passage, and a holding frame that holds the filter on the lower body side in the inner space, and is located at a short distance from the outlet of the upper body. And a range in which the cross-sectional area of the outflow passage when viewed in a circumferential cross-section centered on the outflow port decreases toward the outflow port side,
The upper body has a range in which the cross-sectional area of the outflow passage increases toward the outflow side at a distance from the outflow port, while the upper body has a plurality of projections on the wall surface that receive the protrusions on the component side of the transmission. The holding frame is formed by projecting inwardly as a convex wall, and the holding frame extends radially in the inner region of the base frame with the radial ribs centering on the outlet of the upper body and the crossing between the radial ribs. In the range where the cross-sectional area of the outflow passage decreases toward the outlet side, the cross rib is provided on the upstream side of the convex wall, avoiding the convex wall having the minimum cross-sectional area of the outflow passage. Adopted the configuration.

According to a fifth aspect of the invention, on the premise of the first to fourth aspects, a configuration is adopted in which the radial ribs of the holding frame are positioned to face the convex wall of the upper body.

According to a sixth aspect of the present invention, on the basis of the fifth aspect, a configuration is adopted in which the radiation rib is in contact with the convex wall surface.

According to a seventh aspect of the present invention, based on the first to sixth aspects, a support leg having a cross-sectional shape that is long in the radial direction and short in the crossing direction is interposed between the upper body and the holding frame. The structure in which the filter is held while the holding frame is curved toward the lower body by the action of the support leg is adopted.

Therefore, according to the invention of claim 1,
When viewed from the outlet of the upper body, the crossing ribs of the holding frame extending in the circumferential direction that blocks the oil along the concentric circles of the outlet, avoiding each convex wall, are located on the upstream side and the downstream side, Due to the presence of the convex wall, it is possible to effectively prevent the oil flow resistance from increasing by narrowing the outflow passage with the cross ribs even if the outflow passage at the relevant portion is narrow.

According to the second aspect of the invention, the crossing rib further narrows the outflow passage near the outflow port because the crossing rib is located upstream of the convex wall which is closest to the outflow port. Similarly, it is possible to effectively prevent the oil flow resistance from increasing.

According to the third aspect of the invention, in the range where the cross-sectional area of the outflow passage decreases toward the outlet side, the amount of oil passing through the filter increases toward the downstream side, and in addition, the outflow Since the cross-sectional area of the passage is reduced, the oil flow velocity increases rapidly due to these synergistic effects, and in the same range, the cross ribs of the holding frame avoid the convex walls and are located on the upstream and downstream sides. Because of the relationship,
It is possible to effectively prevent the oil flow resistance from increasing by suppressing a sudden change in the cross-sectional area of the outflow passage.

According to the fourth aspect of the present invention, in the range where the cross-sectional area of the outflow passage decreases toward the outlet side, the crossing rib avoids the convex wall that minimizes the cross-sectional area of the outflow passage, and its upstream side. Similarly, due to the relationship of being located at, the sudden change in the cross-sectional area of the outflow passage due to the crossing rib can be suppressed, and the oil flow resistance can be effectively prevented from increasing.

In the fifth to seventh aspects, for example,
Even if the internal space defined by the upper body and the lower body is in a negative pressure state and the holding frame is deformed to the outflow passage side where the convex wall exists with the filter, the deformation to the outflow passage side is effectively performed. It can be prevented.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments shown in the drawings. An oil strainer according to the embodiments is shown in FIG.
And a lower body 2, a filter 3 and a holding frame 4, the upper body 1 is arranged on the control valve side which is a component of the transmission, the lower body 2 is arranged on the oil pan side, and the filter 3 and the holding frame 4 are It is housed in an internal space defined by the upper body 1 and the lower body 2.

This will be described in detail. First, as shown in the figure, the upper body 1 has a desired substantially rhombic shape, is thinly molded from a synthetic resin material, and has one end connected to the control valve side. In addition to forming the oil outlet 5 having a shape and forming a fixing portion 6 at an appropriate position of the flange portion 1a, a plurality of recesses for receiving a protrusion such as a bolt head for fixing the control valve is formed on the wall surface thereof. The wall 7 is configured to project inward. Therefore, when viewed from the outside of the upper body 1, the convex walls 7 are arranged in a depressed state corresponding to the protrusions such as the bolt heads. The present invention is not limited to the illustrated circular shape and the polished shape.

Further, as is apparent from FIGS. 3 to 6, the upper body 1 is provided with a plurality of positively bending the holding frame 4 to the lower body 2 side at an appropriate position on the wall surface where the convex wall 7 does not exist. The pillar legs 8 are also provided so as to project inward, and the pillar legs 8 are set so that the one on the center side is high and the one on the peripheral edge side is low, although slightly.

The lower body 2 has a shape similar to that of the upper body 1 and is thinly formed of a synthetic resin material to form an oil inlet 9 having a relatively large elongated hole at one end. By joining the flange portion 2a of itself and the flange portions 1a of the upper body 1 by vibration welding or the like, the filter 3 and the holding frame 4 are housed in the defined internal space.

The filter 3 has a shape similar to that of the upper body 1 and is formed of a filtering material such as mesh or non-woven fabric to obtain a uniform and uniform holding action by each rib of the holding frame 4 which will be described later. The internal space defined by the body 1 and the lower body 2 is housed in such a manner that the internal space is partitioned into an outflow passage W1 and an inflow passage W2.

Similarly, the holding frame 4 is formed of a synthetic resin material with a shape similar to that of the upper body 1, and each flange portion 1 of the upper body 1 and the lower body 2 is formed.
a, 2a, a plurality of radial ribs 11 radially extending around the outlet 5 of the upper body 1 in the inner region of the base frame 10, and the radial ribs 11 intersect each other. A plurality of intersecting ribs 12 extending in a circular shape are provided. However, in a storage state with respect to the internal space, the pillar legs 8 provided on the side of the upper body 1 described above are used to make use of the difference in height to lower the lower body. The filter 3 is held between the lower body 2 and the second body while being slightly curved to the 2 side.

Then, the radiating rib 11 and the crossing rib 12 are provided.
The positional relationship between the upper body 1 and the convex wall 7 on the upper body 1 side will be described in detail. In particular, as apparent from FIG.
Is located so as to face each convex wall 7 of the upper body 1, and the respective convex walls 7 (specifically, 7a to 7n) are substantially completely avoided for the cross rib 12 (specifically, 12o to 12k). And located on the upstream side and the downstream side, respectively.

Because, in the outflow passage W1, the convex wall 7
The area where is present is the narrowest, but the radiation rib 1
As described above, 1 is a relationship in which the outlet 5 of the upper body 1 extends radially, and for example, even if the convex walls 7 are opposed to each other, the outflow passage of the portion where the convex wall 7 exists. W
There is almost no fear of narrowing 1 in the first place, but the crossing ribs 12 conversely extend from the outlet 5 of the upper body 1 along the concentric circle of the outlet 5 in the circumferential direction that blocks oil. Therefore, if the intersecting ribs 12 are made to face the respective convex walls 7, the outflow passage W1 is further narrowed, and the flow resistance of oil increases unnecessarily.

In the figure, X1 is a short distance from the outflow port 5 of the upper body 1, and the cross-sectional area of the outflow passage W1 when viewed in a circumferential cross section around the outflow port 5 is the outflow port 5 A range that decreases toward the side, X2 is a range where the cross-sectional area of the outflow passage W1 hardly changes, and X3 is a long distance from the outflow port 5, and the cross-sectional area of the outflow passage W1 is toward the outflow port 5 side. It is an increasing range. Therefore, under the present embodiment, the cross-sectional area of the outflow passage W1 when viewed in a circumferential cross-section around the outflow port 5 is in the state shown in FIG. 7. In the range X3, as shown by the phantom line in FIG. 2, it is possible to position the intersecting rib 12l so as to face the convex walls 7l and 7m, but in any case, in the ranges X1 and X2, The crossover ribs are located almost on the upstream side and the downstream side, respectively, avoiding each convex wall substantially completely, and at least closest to the convex wall that minimizes the cross-sectional area of the outflow passage W1, that is, the outflow port 5. For the convex walls 7a and 7b, the crossover rib 12a is provided.
・ Avoid 7b and position it upstream.

Further, under the present embodiment, the radiation rib 11
In the case of locating each of the radiating ribs 11 facing each of the convex walls 7, the radiating ribs 11 are positioned slightly apart from the surface of the convex wall 7 as shown in the figure. It is also possible to directly abut. It is needless to say that even if the radiating rib 11 is brought into contact with the surface of the convex wall 7, there is almost no fear of narrowing the outflow passage W1 as described above. This is because deformation due to pressure can be prevented more reliably.

Therefore, in the oil strainer having such a structure, the filter 3 and the holding frame 4 are housed in the internal space defined by both the bodies 1 and 2, and the upper body 1
When the flange portions 1a and 2a of the lower body 2 are joined to each other by vibration welding or the like, an extremely thin strainer body can be obtained.

Then, after that, as shown in FIG. 8, the upper body 1 is placed on the control valve 13 side and the lower body 2 is placed.
While arranging on the oil pan 14 side, the upper body 1
When the fixing portion 6 formed on the upper body 1 side is screwed to the control valve 13 side by connecting the outflow port 5 of the control valve 13 to the control valve 13, the protrusion 15 such as a bolt head present on the control valve 13 side is fixed. Since it can be received in the corresponding convex wall 7, the oil strainer itself can be installed very close to the control valve 13 side. Therefore, in combination with the thinning of the strainer body itself, the transmission itself can be greatly reduced in size.

Under this installation condition, if an oil pump (not shown) is operated, the oil in the oil pan 14 will flow from the inflow port 9 formed on the lower body 2 side into the inflow passage W2. Is sucked into the control valve 13 through the outflow passage W1 through the outflow port 5 after the impurities are filtered by the filter 3, but in the process of passing through the outflow passage W1, the upper body 1
Since the radial ribs 11 and the crossing ribs 12 of the holding frame 4 that holds the filter 3 are placed in the above-described positional relationship with respect to each of the convex walls 7 of FIG. Even if is protruding, the fear that the outflow passage W1 is narrowed and the oil flow resistance is unnecessarily increased can be completely eliminated.

In particular, in the range X1 where the cross-sectional area of the outflow passage W1 decreases toward the outflow port 5 side, in addition to the amount of oil passing through the filter 3 increasing toward the downstream side,
Since the cross-sectional area of the outflow passage W1 is reduced, the flow velocity of the oil rapidly increases due to these synergistic effects, and in the same range X1, the cross rib 12 of the holding frame 4 causes the outflow passage W1 to flow out.
The convex walls 7a and 7b having the smallest cross-sectional area of 1 prevent each convex wall, and suppress the sudden change of the cross-sectional area of the outflow passage W1 due to the relationship of being located on the upstream side and the downstream side, and the oil distribution. It is possible to effectively prevent the resistance from increasing.

Further, even if the holding space 4 is deformed to the side of the outflow passage W1 along with the filter 3 due to the negative pressure in the internal space, the filter 3 is still used under the present embodiment.
The holding frame 4 for holding the
In addition to being forcibly curved to the lower body 2 side by the, the radial ribs 11 of the holding frame 4 are positioned to face the convex wall 7 or directly contact the convex wall 7 surface. Therefore, this effectively prevents the deformation toward the outflow passage W1 side and causes no pressure loss. In addition to this, the filter 3 itself is supported by a small lattice shape partitioned by the ribs 11 and 12 of the holding frame 4, so that the filter 3 is reliably held with a uniform tensile strength.

In the above embodiment, the column leg 8 is used.
Is provided on the side of the upper body 1 in a substantially cylindrical shape, but the present invention is not limited to this.
As shown in FIG. 9, it may have a flat cross-sectional shape that is long in the radial direction and short in the crossing direction. Especially in this case, while maintaining the supporting strength and rigidity in a high temperature atmosphere,
It can also contribute to the reduction of distribution resistance. On the other hand, although not specifically shown, a column leg 8 extending in the direction of the upper body 1 is provided at the connecting portion of the radial rib 11 and the cross rib 12, and the column leg 8 is brought into contact with the upper body 1 side. The holding frame 4 may be configured to be curved toward the lower body 2 depending on the implementation.

[0035]

As described above, according to the present invention, by adopting the above structure, the oil strainer itself can be made thin, and the projections existing on the component parts of the transmission can be effectively absorbed.
Since it can be placed close to the component side, it can greatly contribute to downsizing of the entire transmission, which is a recent demand, and downsizing of the vertical dimension for securing the ground clearance. .

Moreover, in particular, according to Claims 1 and 2, when viewed from the outlet of the upper body, the cross ribs of the holding frame extending in the circumferential direction that blocks oil along the concentric circle of the outlet are provided. All convex walls, or at least the convex wall that is closest to the outflow port is avoided, and it is located upstream or downstream of the convex wall. However, it is possible to effectively prevent the flow resistance of the oil from being increased by further narrowing the outflow passage with the intersecting rib.

Further, under claims 3 and 4, in the range where the cross-sectional area of the outflow passage decreases toward the outlet side,
In addition to the increase in the amount of oil passing through the filter toward the downstream side, the cross-sectional area of the outflow passage decreases, so that the oil flow velocity rapidly increases due to these synergistic effects, and in the same range, the cross-sectional area decreases. The ribs are located on the upstream side or the downstream side of all the convex walls, or avoiding the convex walls that minimize the cross-sectional area of the outflow passage, and by suppressing the sudden change of the cross-sectional area of the outflow passage, It is possible to effectively prevent the oil flow resistance from increasing.

Further, in the fifth to seventh aspects, for example, the internal space defined by the upper body and the lower body is in a negative pressure state, and the holding frame has the filter and the convex wall. Even if an attempt is made to deform to the outflow passage side, the deformation to the outflow passage side can be effectively prevented, and there is no risk of causing pressure loss. Further, in particular, in claim 7,
In addition to the above function and effect, it is possible to contribute to the reduction of flow resistance while maintaining the supporting strength and rigidity in a high temperature atmosphere.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an oil strainer according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a relationship between an upper body and a holding frame from the inside.

FIG. 3 is an end view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a cross-sectional view taken along line CC of FIG.

FIG. 6 is a sectional view taken along line DD of FIG. 2;

FIG. 7 is a diagram illustrating a circumferential cross-sectional area of an outflow passage.

FIG. 8 is a cross-sectional view of an essential part showing a state of being installed on the transmission side of an automobile.

FIG. 9 is a perspective view of a main part showing another example of the support leg.

[Explanation of symbols]

1 Upper body 1a Same flange part 2 Lower body 2a Same flange part 3 Filter 4 Holding frame 5 Outlet 6 Fixing part 7 Convex wall (7a to 7n) 8 Support leg 9 Inlet 10 Base frame 11 Radiating rib 12 Crossing rib (12o ~ 12l) 13 control valve (component) 14 oil pan 15 protrusion W1 outflow passage W2 inflow passage X1 range in which the cross-sectional area of the outflow passage decreases toward the outlet side X2 range in which the cross-sectional area of the outflow passage hardly changes X3 outflow Range where the cross-sectional area of the passage increases toward the outlet side

Claims (7)

[Claims] 1. An oil strainer used for a transmission of an automobile, comprising an upper body having an outflow port and disposed on a component side of the transmission, and an inflow port having an upper port and disposed on an oil pan side. A lower body, a filter that divides an inner space defined by the upper body and the lower body into an outflow passage and an inflow passage, and a holding frame that holds the filter on the lower body side in the inner space. , A plurality of depressions for receiving the projections existing on the component side of the transmission are provided on the wall surface as convex walls and project inward, and the holding frame has the outlet of the upper body in the inner region of the base frame. Radial ribs that extend radially as a center and cross ribs that extend in a cross shape between the radial ribs are provided, and the cross ribs avoid the convex walls, and the upstream side and the downstream side of the convex walls. An oil strainer characterized by being located on the side. 2. An oil strainer used for a transmission of an automobile, comprising an upper body having an outflow port and disposed on the component side of the transmission, and an inflow port having an upper port and disposed on the oil pan side. A lower body, a filter that divides an inner space defined by the upper body and the lower body into an outflow passage and an inflow passage, and a holding frame that holds the filter on the lower body side in the inner space. , A plurality of depressions for receiving the projections existing on the component side of the transmission are provided on the wall surface as convex walls and project inward, and the holding frame has the outlet of the upper body in the inner region of the base frame. Radiation ribs that extend radially as a center and cross ribs that extend in a cross shape between the radiation ribs are provided, and the cross ribs are provided so as to avoid the convex wall closest to the outflow port. An oil strainer characterized by being located on the upstream side of the wall. 3. An oil strainer for use in a transmission of an automobile, comprising an upper body having an outflow port and disposed on the component side of the transmission, and an inflow port and disposed on the oil pan side. The lower body, a filter for partitioning an inner space defined by the upper body and the lower body into an outflow passage and an inflow passage, and a holding frame for holding the filter on the lower body side in the inner space. The area where the cross-sectional area of the outflow passage when viewed in a circumferential cross-section centered on the outflow port is close to the outflow port of the The upper body has a plurality of depressions for receiving the protrusions on the component side of the transmission as a convex wall, while the upper body has a range in which the road cross-sectional area increases toward the outlet side. The holding frame is provided with a radial rib extending radially around the outlet of the upper body, and a crossing rib extending crosswise between the radial ribs. In the range in which the cross-sectional area of the outflow passage decreases toward the outlet side, the cross ribs are located on the upstream side and the downstream side of the respective convex walls, avoiding the respective convex walls. . 4. An oil strainer used for a transmission of an automobile, comprising an upper body having an outflow port and arranged on the component side of the transmission, and an oil strainer having an inflow port and arranged on the oil pan side. A lower body, a filter that divides an inner space defined by the upper body and the lower body into an outflow passage and an inflow passage, and a holding frame that holds the filter on the lower body side in the inner space. The area where the cross-sectional area of the outflow passage when viewed in a circumferential cross-section centered on the outflow port is close to the outflow port of the The upper body has a plurality of depressions for receiving the protrusions on the component side of the transmission as a convex wall, while the upper body has a range in which the road cross-sectional area increases toward the outlet side. The holding frame is provided with a radial rib extending radially around the outlet of the upper body, and a crossing rib extending crosswise between the radial ribs. In the range in which the cross-sectional area of the outflow passage decreases toward the outflow port side, the crossing rib is located on the upstream side of the convex wall, avoiding the convex wall that minimizes the cross-sectional area of the outflow passage. Oil strainer to do. 5. The oil strainer according to claim 1, wherein the radiating rib of the holding frame is located opposite to the convex wall of the upper body. 6. The oil strainer according to claim 5, wherein the radiating rib is in contact with the convex wall surface. 7. A support leg having a cross-sectional shape that is long in the radial direction and short in the crossing direction is interposed between the upper body and the holding frame, and the holding frame is curved toward the lower body by the action of the support leg. The oil strainer according to any one of claims 1 to 6, which holds a filter.