JP2017160955A - Oil strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit a large amount of air from flowing out from an oil strainer at one time, in an oil strainer inside which a filter medium is disposed.SOLUTION: The oil strainer includes: an oil suction part; an oil outflow part; a case part provided with an inclined part displaced upward from a side of the outflow part to a side of the suction part, in a top plate part; and the filter medium disposed inside the case part so that oil passes from an upper side to a lower side in a process of oil moving to the outflow part from the suction part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an oil strainer in which a filter medium is disposed. Specifically, the present invention relates to a technical field for suppressing noise caused by air taken into an oil strainer.

JP-A-11-93633

As an oil circulation mechanism for circulating oil, for example, there is one attached to a transmission of a vehicle.
An oil circulation mechanism attached to a transmission of a vehicle is provided with an oil strainer in which a filter medium is disposed so as not to send impurities when circulating stored oil to the transmission or the like. There is (for example, Patent Document 1).

However, in an oil strainer provided with a filter medium, an air reservoir may be formed by the filter medium, and the oil pump sucks up a large amount of air in the air reservoir via the oil strainer when the vehicle suddenly moves. May end up.
If the oil pump sucks up a large amount of air, noise (pump sound) and a decrease in hydraulic pressure will occur, and the passenger may feel uncomfortable.

  Therefore, in view of the above situation, an object of the present invention is to prevent a large amount of air from flowing out from an oil strainer at a time in an oil strainer in which a filter medium is disposed.

An oil strainer according to the present invention includes an oil suction portion, an oil outflow portion, a case portion in which an inclined portion that is displaced upward from the outflow portion side to the suction portion side is provided on the top plate portion, and the oil And a filter medium disposed in the case part so that the oil passes from the upper part to the lower part in the process of moving from the suction part to the outflow part.
As a result, an air pocket is hardly formed near the filter medium.

It is desirable that the suction portion of the oil strainer described above is provided on the side of the case portion.
As a result, bending of the oil movement path in the oil strainer is reduced.

It is desirable that the filter medium of the oil strainer described above is disposed in an inclined state so as to be displaced upward from the end portion on the suction portion side to the end portion on the outflow portion side.
Thereby, the air which passed the filter medium is induced | guided | derived so that it may flow out from an outflow part.

It is desirable that the filter medium of the above-described oil strainer is a cylindrical body and the axial direction is a substantially horizontal direction.
Thereby, the air in the vicinity of the filter medium in the pre-filtration chamber is easily moved upward along the curve of the outer shape of the filter medium.

  According to the present invention, it is possible to prevent a large amount of air from flowing out from the oil strainer at a time in the oil strainer in which the filter medium is disposed.

It is the schematic which shows the vehicle carrying the oil strainer of embodiment of this invention. It is sectional drawing which shows the state by which the oil strainer was arrange | positioned at the oil pan. It is sectional drawing for demonstrating the motion of the bubble which entered the filtration front chamber. It is sectional drawing for demonstrating the oil strainer as a prior art example. It is sectional drawing for demonstrating the movement path | route of oil. It is sectional drawing for demonstrating 2nd Embodiment. It is a perspective view which shows the filter medium of 3rd Embodiment. It is sectional drawing for demonstrating the oil strainer of 3rd Embodiment. It is sectional drawing for demonstrating a modification.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention oil strainer is demonstrated with reference to an accompanying drawing.

<1. Oil Strainer Configuration>
The configuration of the oil strainer in the first embodiment will be described.
FIG. 1 is a diagram illustrating an example of a positional relationship among a transmission 1, an engine 2, an oil pan 3, an oil strainer 4, and an oil pump 5 arranged inside the vehicle 100.

  The transmission 1 is a mechanism that enables a change in the gear ratio when the power obtained from the engine 2 is transmitted to the wheels. Oil (ATF: Automatic Transmission Fluid) is used to improve fuel efficiency and riding comfort. The smooth operation used is necessary. Therefore, the transmission 1 is provided with an oil circulation mechanism for circulating oil.

  The oil circulation mechanism includes an oil pan 3 for storing oil, an oil strainer 4 for removing impurities from the oil, an oil pump 5 for sucking up oil, and the like.

Specific configurations of the oil pan 3 and the oil strainer 4 will be described with reference to FIG.
The oil pan 3 has a box-like shape opened upward and is attached to the lower part of a transmission (not shown). The oil is stored in the oil pan 3 as shown by a matte surface in FIG.
The oil strainer 4 is disposed so as to be immersed in the oil stored in the oil pan 3, and an oil pump 5 is attached to the upper side.

The oil strainer 4 includes a case portion 6 that is hollow inside, and a pipe-shaped cylindrical portion 7 that extends upward from one end of the case portion 6.
The internal space of the case portion 6 is a filtration chamber 8. In addition, although the inside of the filtration chamber 8 is substantially filled with oil, illustration is abbreviate | omitted.
The case portion 6 is provided with a suction portion 9 for sucking stored oil in the oil pan 3, and the suction portion 9 is formed with a suction hole 9 a that is open to the side.

  At least a part of the cylindrical portion 7 is an outflow portion 10 for allowing oil to flow out from the filtration chamber 8, and an opening at the upper end of the outflow portion 10 is an outflow hole 10a.

A ceiling portion in the filtration chamber 8 is a top plate portion 11, and at least a part of the top plate portion 11 is an inclined portion 12 that is displaced upward from the outflow portion side to the suction side.
A filter medium 13 for removing iron powder and the like contained in the oil is disposed in the filtration chamber 8.
The filter medium 13 has a large number of holes penetrating from the upper surface 13a to the lower surface 13b.
The end of the filter medium 13 on the suction part 9 side is an inflow part side end part 13c, and the end part on the outflow part 10 side is an outflow part side end part 13d.
A part of the space in the filtration chamber 8 where the oil before passing through the filter medium 13 is located is a pre-filtration chamber 14, and a part of the space in the filtration chamber 8 where the oil after passing through the filter medium 13 is located is a post-filtration chamber. It is set to 15.
Further, the oil located in the pre-filtration chamber 14 is prevented from moving to the post-filtration chamber 15 unless it passes through the filter medium 13.

<2. Oil movement>
The movement of oil in the oil strainer 4 will be described.
First, the movement of oil when the engine 2 is idling (or when the vehicle 100 is stopped) will be described with reference to FIG.
The oil pump 5 in the present embodiment is configured to move in conjunction with a drive shaft that drives the wheels of the vehicle 100. Therefore, when the vehicle is stopped, no power is supplied to the oil pump 5, so that the operation of the oil pump 5 is stopped. The oil pump 5 may be configured to obtain power from the engine 2.

  The oil stored in the oil pan 3 fluidly moves in the front / rear, left / right, upper / lower directions in accordance with the movement of the vehicle 100. ) May enter. In addition, the bubbles a contained in the oil may enter the pre-filtration chamber from the suction portion 9.

In the idling state of the engine 2, the oil pump 5 stops driving, so that the movement of oil from the suction portion 9 toward the outflow portion 10 stops, and the bubbles a that have entered the pre-filtration chamber 14 move upward due to buoyancy. To do. At this time, since the top plate portion 11 is provided with the inclined portion 12, the bubbles a move in a direction away from the outflow portion 10 so as to follow the inclination of the inclined portion 12 (see arrows in FIG. 3).
Therefore, even if an air pocket is formed by collecting a large number of bubbles, it is formed at a position away from the filter medium 13 and the outflow portion 10.

  The oil strainer 4 in the present embodiment passes from the upper surface 13a of the filter medium 13 toward the lower surface 13b when the oil passes through the filter medium 13. Therefore, when the operation of the oil pump 5 is stopped, the force that works to bring the air bubbles a located in the pre-filtration chamber 14 closer to the filter medium 13 is lost, and the force that rises due to buoyancy works effectively. That is, the bubble a naturally moves in a direction away from the filter medium 13.

On the other hand, unlike the present embodiment, a case where oil passes from the lower surface 13b of the filter medium 13 toward the upper surface 13a will be described.
An example is shown in FIG.
In the oil strainer 4 ′ different from the present embodiment, the suction hole 9a is provided in the lower surface of the case portion 6, the substantially lower half of the filtration chamber 8 is the pre-filtration chamber 14, and the substantially upper half is the post-filtration chamber. It is set to 15.

  Therefore, in the oil strainer 4 ′, as shown in the drawing, the oil that has flowed into the pre-filtration chamber 14 passes from the lower surface 13b toward the upper surface 13a, and therefore enters the pre-filtration chamber 14 when the drive of the oil pump 5 is stopped. The bubble a moves in a direction approaching the lower surface 13b of the filter medium 13 by buoyancy.

  At this time, since the drive of the oil pump 5 is stopped, the force enough to pass through the filter medium 13 does not act on the bubbles a, so that the bubbles a are easily accumulated in the lower part of the filter medium 13. That is, a large number of bubbles a gather and an air reservoir A as shown in FIG. 4 is likely to be formed near (directly below) the filter medium 13.

  Accordingly, when the engine 2 is driven from the idling state in order to start the vehicle 100, the oil pump 3 is driven together, so that the air reservoir A formed immediately below the filter medium 13 passes through the filter medium 13 and flows out. The oil pump 3 is reached via the part 10. If the oil pump 3 sucks up a large amount of air, noise (pump sound) is generated, and the ride comfort of the passenger is deteriorated.

Next, the oil movement path R when the oil pump 5 is driven and the oil in the oil strainer 4 is sucked up by the oil pump 5 will be described with reference to FIG.
As shown in FIG. 5, the oil flowing in from the suction hole 9 a of the suction part 9 passes through the filter medium 13 from the upper surface 13 a side to the lower surface 13 b side and is filtered, and then moves toward the outflow hole 10 a of the outflow part 10. To do.

  The suction part 9 (suction hole 9 a) of the oil strainer 4 in the present embodiment is provided on the side of the case part 6. As a result, the oil that has flowed into the pre-filtration chamber 14 can reach the oil pump 5 from the suction portion 9 by a change in direction of approximately 90 ° (a change in direction of at least less than 180 °).

  On the other hand, it is also possible to provide the suction part 9 (suction hole 9a) in the upper part or the lower part of the case part 6 (that is, in a state where the suction hole 9a is opened upward or downward). However, when the suction portion 9 is provided on the upper surface side of the case portion 6, the oil movement path moves from the upper side to the lower side by moving to the pre-filtration chamber 14, and then passes through the filter medium 13 and then 180 °. The oil pump 5 is reached by changing the direction and moving from below to above. Further, when the suction portion 9 is provided on the lower surface side of the case portion 6, the direction is changed from the upper side to the lower side by changing the direction by 180 ° after moving to the pre-filtration chamber 14 by moving from the lower side to the upper side. After passing through the filter medium 13, the oil pump 5 reaches the oil pump 5 from the outflow portion 10 by performing a 180 ° direction change again.

  Therefore, by providing the suction part 9 on the side of the case part 6, the bending of the moving path R can be reduced and the pressure loss can be reduced.

<3. Second Embodiment>
The configuration of the oil strainer 4A in the second embodiment will be described with reference to FIG.
The oil strainer 4 </ b> A according to the second embodiment is different from the oil strainer 4 in the arrangement mode of the filter medium 13 arranged in the filtration chamber 8.
Specifically, as shown in FIG. 6, the filter medium 13 is disposed in the filtration chamber 8 in an inclined state so as to be displaced upward from the suction portion side end portion 13c to the outflow portion side end portion 13d.

  Thereby, even when the engine 2 is in an idling state (or when the vehicle 100 is stopped) in a state where the bubbles a pass from the pre-filter chamber 14 through the filter medium 13 and reach the post-filter chamber 15, the bubbles a are filtered by the buoyancy. After moving upward until it reaches the lower surface 13b of 13, it moves toward the outflow part 10 along the inclination of the lower surface 13b. Therefore, it is suppressed that many bubbles a gather and form an air pocket in the post-filtration chamber 15. As a result, the oil pump 5 can be prevented from sucking a large amount of air at the time of starting.

  Further, the oil flowing in from the suction part 9 approaches a top surface 13a of the filter medium 13 closer to the direction perpendicular to the upper surface 13a than shown in FIG. 2, and passes through a large number of holes provided in the filter medium 13 (movement path in FIG. 6). R). Therefore, the pressure loss can be further reduced.

<4. Third Embodiment>
The configuration of the oil strainer 4B in the third embodiment will be described with reference to FIGS.
The oil strainer 4B in the third embodiment is different from the above-described filter medium 13 in the shape of the filter medium 13B. Specifically, as shown in FIG. 7, the filter medium 13 </ b> B includes a filter part 13 e formed into a cylindrical body in which many holes functioning as a filter for filtering impurities are formed and both ends are opened, and a filter part 13e and a non-filter part 13f attached so as to close the opening at one end.

FIG. 8 shows a state in which the filter medium 13B is disposed in the filtration chamber 8 of the oil strainer 4B.
In the filtration chamber 8 of the oil strainer 4B, the filter medium 13B is disposed in a state where the axial direction is substantially horizontal. The pre-filtration chamber 14 is a space outside the filter medium 13B, and the post-filtration chamber 15 is a space inside the filter medium 13B.
Further, in order for the oil located in the pre-filtration chamber 14 to move to the post-filtration chamber 15, it is necessary to pass through the pipe-shaped filtration portion 13e of the filter medium 13B. That is, the space of the post-filtration chamber 15 is communicated only with the internal space of the cylindrical portion 7.

  FIG. 8 shows the movement path R of oil when sucked up by the oil pump 5. The oil stored in the oil pan 3 moves from the suction hole 9a of the suction part 9 toward the outflow hole 10a of the outflow part 10 through the filtration part 13e of the filter medium 13B, as shown in the figure.

Although illustration is omitted, the bubble a that has entered the pre-filtration chamber 14 rises toward the top plate portion 11 when it is located above the filter medium 13B, and is separated from the outflow portion 10 along the inclined portion 12. Move to.
The bubbles a located below the filter medium 13B are moved upward along the outer shape (curved shape) of the filter part 13e of the filter medium 13B. Since the outer shape of the filtering part 13e is curved, it is difficult for the filtering medium 13B to prevent the movement of the bubbles a due to buoyancy.

There is also a moving path R that moves from the pre-filtration chamber 14 to the post-filtration chamber 15 through a filtering hole formed in the lower portion of the filtering portion 13e of the filter medium 13B.
However, it is also possible to configure so that no filtering hole is formed in the lower part (substantially lower half) of the filtering part 13e. That is, in the filtration part 13e, many holes for filtration may be formed only in the upper part (substantially upper half). In this case, the moving path R is only a path that passes through the filtering unit 13e from the top to the bottom as shown in FIG.
As a result, as described in the first embodiment, the bubbles a are unlikely to accumulate in the lower portion of the filter medium 13. In particular, since the outer shape of the filtration part 13e is curved, the bubbles a are less likely to accumulate in the lower part of the filter medium 13.

<5. Modification>
As shown in FIG. 9, an upper hole 11 a opened upward may be provided at the highest position of the top plate portion 11 of the case portion 6 of the oil strainer 4. The upper hole 11 a is a hole for removing an air pocket formed in the pre-filtration chamber 14. That is, as shown in the figure, the bubbles a and the air reservoir A existing in the pre-filtration chamber 14 are easily moved to the outside of the case portion 6 through the upper hole 11a.

  Further, when the upper hole 11a is provided, the oil flows from the upper hole 11a, so that there is a possibility that it becomes a main oil movement path depending on the size of the hole. In order to suppress this and make the main movement path of oil the inflow hole 9a, it is preferable to make the diameter of the upper hole 11a smaller than the diameter of the inflow hole 9a (see FIG. 9).

<5. Summary>
The oil strainer 4 (4A, 4B) described in the above embodiments and modifications includes an oil suction portion 9, an oil outflow portion 10, and an inclined portion 12 that is displaced upward from the outflow portion side to the suction portion side. And a filter medium 13 (which is disposed in the case portion 6 so that the oil passes from the upper side to the lower side in the course of the movement of the oil from the suction portion 9 to the outflow portion 10). 13B).
Thereby, an air pocket is made difficult to form in the filter medium 13 (13B) vicinity.
Accordingly, it is possible to suppress a large amount of air from flowing out from the outflow portion 10 at the time of starting or the like.
In addition, since the air that has entered the pre-filtration chamber 14 is easily moved in the direction away from the outflow portion 10 by the inclined portion 12 provided in the top plate portion 11, a large amount of air may flow out from the outflow portion 10. More suppressed.

Further, as described in the first embodiment, the suction part 9 may be provided on the side of the case part 6.
Thereby, the bending of the oil movement path R in the oil strainer 4 (4A, 4B) is reduced.
Accordingly, pressure loss (friction loss) can be reduced. As a result, the load on the oil pump 5 can be reduced, and the fuel efficiency of the vehicle 100 can be improved.

Furthermore, as described in the second embodiment, the filter medium 13 may be disposed in an inclined state so as to be displaced upward from the suction portion side end portion 13c to the outflow portion side end portion 13d.
As a result, the air that has passed through the filter medium 13 is guided to flow out from the outflow portion 10.
Therefore, since the air pool A is not easily formed in the filter medium rear chamber 15, it is possible to prevent a large amount of air from flowing out from the outflow portion 10 at one time.
Further, when the suction part 9 (suction hole 9a) is provided on the side of the oil strainer 4A, it is difficult to cause a decrease in pressure loss even if the position of the suction part 9 (suction hole 9a) is set to a low position. Therefore, since the suction part 9 (suction hole 9a) can be provided at a low position on the side of the oil strainer 4A, the suction hole 9a can be hardly exposed from the oil surface.

Furthermore, as described in the third embodiment, the filter medium 13B may be a tubular body (tubular filtration portion 13e), and the axial direction may be a substantially horizontal direction.
Thereby, the air (bubbles a) in the vicinity of the filter medium 13B in the pre-filtration chamber 14 is easily moved upward along the curve of the outer shape of the filter medium 13B.
Therefore, since the air passing through the filter medium 13B can be reduced, it is possible to prevent the air from flowing out from the outflow portion 10.

  Each of the above-described configurations can be applied not only to the oil circulation mechanism targeted for the transmission 1, but also to the oil circulation mechanism targeted for various mechanisms (for example, the engine 2) that require oil supply in the vehicle. It is.

  It is also possible to suppress the intake of air (bubbles) from the suction portion 9 into the pre-filtration chamber 14 by increasing the amount of oil stored in the oil pan 3. However, in this case, an increase in the vehicle weight due to the increase in oil and an increase in oil agitation resistance due to a rotating member or the like disposed inside the oil pan 3 in order to agitate the stored oil, The fuel efficiency will be reduced. According to the present invention, the interruption of oil supplied to the transmission 1 and the intake of bubbles can be suppressed without causing such a problem.

  4, 4A, 4B ... oil strainer, 6 ... case part, 9 ... suction part, 10 ... outflow part, 11 ... top plate part, 12 ... inclined part, 13, 13B ... filter material, 13c ... end part on suction part side, 13d ... Outlet side end

Claims (4)

An oil intake,
The oil spill,
A case part in which an inclined part that is displaced upward from the outflow part side to the suction part side is provided on the top plate part;
An oil strainer comprising: a filter medium disposed in the case portion so that the oil passes from the upper side to the lower side in a process in which the oil moves from the suction portion to the outflow portion. The oil strainer according to claim 1, wherein the suction portion is provided on a side of the case portion. The oil strainer according to claim 1, wherein the filter medium is disposed in an inclined state so as to be displaced upward from an end portion on the suction portion side to an end portion on the outflow portion side. The oil strainer according to claim 1, wherein the filter medium is a cylindrical body and has an axial direction substantially horizontal.

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