JP4983611B2 - Centrifugal oil filter - Google Patents

Description

  The present invention relates to a centrifugal oil filter. More specifically, the present invention suppresses the occurrence of bubbles in oil by suppressing the oil injected from the injection nozzle from directly colliding with the oil level accumulated at the bottom of the housing. The present invention relates to a centrifugal oil filter.

  As a conventional centrifugal oil filter, for example, as shown in FIG. 8, a housing 104 in which an oil inlet 106 and an oil outlet 107 are formed, and a container-like centrifuge that is rotatably supported in the housing 104. The rotor 111, the oil introduction part 110 for introducing the oil flowing into the housing 104 from the oil inlet 106 into the centrifugal rotor 111, and the oil provided in the lower part of the centrifugal rotor 111 and introduced into the centrifugal rotor 111 An apparatus including an injection nozzle 119 that injects outside is known (see, for example, Patent Document 1). In the centrifugal oil filter 101, the centrifugal rotor 111 is rotated by the injection force (injection reaction force) of the injection oil from the injection nozzle 119, and foreign matters such as sludge contained in the oil in the centrifugal rotor 111. S is centrifuged.

Japanese Patent Laid-Open No. 10-66805

  However, in the conventional centrifugal oil filter 101, the upper part of the bottom of the housing 104 is open, so that when the amount of oil collected at the bottom of the housing 104 is large, the injection oil from the injection nozzle 119 is oil. It collides directly with the liquid surface, and air is entrained in the oil at the time of the collision, thereby generating bubbles B. As a result, the bubbles may cause problems such as a decrease in oil life, poor engine lubrication, and a decrease in hydraulic pressure.

  The present invention has been made in view of the above-described situation, and suppresses the occurrence of bubbles in the oil by suppressing the injection oil from the injection nozzle from directly colliding with the oil level accumulated at the bottom of the housing. An object of the present invention is to provide a centrifugal oil filter that can be used.

The present invention is as follows.
1. A housing having a bottomed cylindrical upper case having a lower opening, and a lower case removably attached to the upper case and having an oil inlet and an oil outlet formed therein;
A container-like centrifugal rotor rotatably supported in the housing;
Oil that extends upward from the center of the bottom of the lower case and has a hollow shaft shape that rotatably supports the centrifugal rotor, and has a lower end connected to the oil inlet and flows into the housing from the oil inlet. An oil introduction part for introducing the oil into the centrifugal rotor;
An injection nozzle that is provided in the centrifugal rotor and injects oil introduced into the centrifugal rotor in a direction tangential to the centrifugal rotor and inclined downward with respect to the horizontal ;
It is provided in the lower case so as to cover the upper part of the oil level accumulated at the bottom of the lower case, and the injection oil from the injection nozzle is prevented from directly colliding with the oil level accumulated at the bottom of the lower case. includes a baffle plate, the,
The baffle plate has an oil passage passage hole formed in an arc shape centered on the rotation axis of the centrifugal rotor, and an outer periphery side of the passage hole so as to cover a lower portion of the passage hole. A centrifugal oil filter, characterized in that a cover portion that is inclined and extended downward is provided .
2. The centrifugal rotor has a bottomed cylindrical rotor main body that is open at the bottom, and a lid that is detachably attached to a lower portion of the rotor main body and provided with the injection nozzle . The centrifugal oil filter as described.
3. In the baffle plate, a plurality of the passage holes are formed along the radial direction, and the hole areas of the plurality of passage holes are increased in the centrifugal direction of the baffle plate . Or 2. The centrifugal oil filter as described.

According to the centrifugal oil filter of the present invention, the oil introduced into the housing from the oil inlet is introduced into the centrifugal rotor by the oil introduction portion, and the oil introduced into the centrifugal rotor is jetted to the outside by the jet nozzle. The centrifugal rotor is rotated by the injection force of the injection oil, and foreign matters such as sludge contained in the oil in the centrifugal rotor are centrifuged. Also, the spray oil from the spray nozzle collides with the baffle plate and then falls to the bottom of the housing and is discharged from the oil outlet to the outside of the housing. As described above, the baffle plate prevents the injection oil from the injection nozzle from directly colliding with the oil liquid level accumulated at the bottom of the housing, so that the generation of bubbles in the oil can be suppressed. As a result, it is possible to prevent problems such as a decrease in oil life due to bubbles, poor engine lubrication, and a decrease in hydraulic pressure.
Further, the baffle plate, the cover portion covering the passage hole and the passage hole for the oil passage is provided, a part of the injection oil from the injection nozzle, the momentum is weakened is colliding with the cover portion At the same time, the oil is quickly dropped to the bottom of the housing through the passage hole, so that accumulation of oil on the baffle plate can be suppressed.
Further, the baffle plate has a plurality of passage holes formed along a radial direction thereof, and a hole area of the plurality of passage holes is increased in a centrifugal direction of the baffle plate. Oil that is diffused and injected from the injection nozzle to the outer periphery of the baffle plate at high engine speeds, etc., is quickly dropped to the bottom of the housing through the passage hole having a relatively large hole area. This is suitable for a case where it is desired to circulate a large amount of oil through the lubrication path at high rotations.
As a reference example, when the baffle plate is formed in a conical shape with a diameter decreasing downward, and the baffle plate has a central hole for oil passage at the center thereof, The oil that collided with the baffle plate flows over the baffle plate from the outer peripheral side to the center side over time, and then falls to the bottom of the housing through the center hole, so it is included in the oil flowing on the baffle plate. The bubbles are naturally degassed, and the generation of bubbles in the oil can be more reliably suppressed.
When a spiral guide wall for guiding oil on the baffle plate is provided on the upper surface of the baffle plate, the oil colliding with the baffle plate is guided on the baffle plate by the guide wall and spiraled. Furthermore, since it flows over time, the natural defoaming rate of the bubble contained in oil can be raised.
Further, when an oil passage passage hole is formed in the baffle plate in the vicinity of the outer peripheral guide wall of the adjacent guide walls, the amount of oil injected from the injection nozzle at the time of high engine rotation or the like When there is a relatively large amount of oil, the oil flowing spirally on the baffle plate is quickly dropped to the bottom of the housing through the passage hole, so if you want to circulate a large amount of oil in the lubrication path at high engine speeds, etc. It can respond suitably.

1. Centrifugal oil filter Embodiment 1 The centrifugal oil filter according to the present invention includes a housing, a centrifugal rotor, an oil introduction part, an injection nozzle, and a baffle plate described below.

  The “housing” is not particularly limited in structure, size, material, and the like as long as the oil inlet and the oil outlet are formed. The housing has, for example, a bottomed cylindrical upper case that is open at the bottom, and a lower case that is detachably attached to the upper case and has the oil inlet and the oil outlet formed therein. Can do.

  The “centrifugal rotor” is not particularly limited in structure, size, material, and the like as long as it is rotatably supported in the housing and has a container shape. The centrifugal rotor has, for example, a bottomed cylindrical rotor main body that is open at the bottom, and a lid that is detachably attached to a lower portion of the rotor main body and provided with an injection nozzle that will be described later. be able to.

  As long as the oil introduced into the housing from the oil inlet is introduced into the centrifugal rotor, the structure, the oil introduction form, etc. are not particularly limited. For example, the oil introduction portion can be formed in a hollow shaft shape that extends upward from the center of the bottom of the housing and rotatably supports the centrifugal rotor. For example, the hollow shaft-shaped oil introduction portion may have a lower end continuous to the oil inlet, and a communication port connected to the inlet of the centrifugal rotor may be formed on the outer peripheral side.

  The “injection nozzle” is not particularly limited in structure, size, number, etc. as long as it is provided outside the centrifugal rotor and injects oil introduced into the centrifugal rotor to the outside. The centrifugal rotor is rotated by the injection force of oil injected from the injection nozzle. The injection nozzle can be directed, for example, in a direction tangential to the centrifugal rotor and in a direction inclined downward with respect to the horizontal.

  The “baffle plate” is not particularly limited in structure, size, material, or the like as long as it suppresses the injection oil from the injection nozzle from directly colliding with the oil level accumulated in the bottom of the housing. The baffle plate is usually provided in the housing so as to cover the upper part of the oil level accumulated at the bottom of the housing. In addition, examples of the shape of the baffle plate include a disk shape, a conical shape, and an irregular shape. Furthermore, examples of the material of the baffle plate include metals such as iron and aluminum, resins, and the like.

The baffle plate may be provided with, for example, a passage hole for oil passage and a cover portion covering the passage hole (see FIG. 3).
The cover portion may cover, for example, the upper portion of the passage hole, but it is preferable that the cover portion covers the lower portion of the passage hole from the viewpoint that the oil on the valve plate can be dropped more quickly. . In this case, a part of the injection oil from the injection nozzle collides with the cover part after passing through the passage hole, the momentum is weakened, and it is quickly dropped to the bottom part of the housing.
The size, shape, number, and the like of the passage holes are not particularly limited. For example, a plurality of the passage holes are formed along the radial direction of the baffle plate. It can become larger toward the centrifugal direction.

  Here, the passage hole and the cover portion may be formed by, for example, bending an inner portion of a substantially U-shaped cut formed in the baffle plate downward or upward. Thereby, a passage hole and a cover part can be created more easily.

The baffle plate is formed, for example, in a conical shape with a diameter decreasing downward, and the baffle plate may have a center hole for oil passage at the center thereof (see FIGS. 4 and 4). 7).
In the case of the above-mentioned form, for example, a spiral guide wall for guiding oil on the baffle plate can be provided on the upper surface of the baffle plate (see FIG. 5). In this case, for example, in the baffle plate, an oil passage passage hole can be formed in the vicinity of the outer peripheral guide wall of the adjacent guide walls (see FIG. 6).

  Hereinafter, the present invention will be described in detail by way of Example 1 with reference to the drawings.

Example 1
(1) Configuration of Centrifugal Oil Filter A centrifugal oil filter 1A (hereinafter also simply referred to as “filter 1A”) according to the first embodiment is a metal upper case 2 as shown in FIG. And a housing 4 comprising a lower case 3. The upper case 2 has a bottomed cylindrical shape with the bottom opened. Further, the lower case 3 has a bottomed cylindrical shape with an open top, an oil inlet 6 is formed at the center of the bottom, and an oil outlet 7 is formed at the outer periphery thereof. . The lower end portion of the upper case 2 is fitted to the upper end portion of the lower case 3 via an O-ring 8.

  On the bottom center side of the lower case 3, there is provided a hollow shaft-like oil introduction portion 10 extending upward. A container-like centrifugal rotor 11 is supported on the oil introduction part 10 so as to be rotatable around an axis. In addition, the lower end side of the oil introducing portion 10 is connected to the oil inlet 6, and a communication port 13 that is connected to the inlet 12 of the centrifugal rotor 11 is formed on the outer periphery of the upper end. Therefore, the oil introduced into the housing 4 from the oil inlet 6 is introduced into the centrifugal rotor 11 by the oil introduction part 10. Further, the upper end small diameter portion 10 a of the oil introduction portion 10 is screwed or fitted into the center hole 15 a of the bolt 15 screwed to the upper end portion of the upper case 2.

  The centrifugal rotor 11 includes a metal rotor body 17 and a lid 18. The rotor body 17 has a bottomed cylindrical shape with the lower part opened. Further, the lower end portion of the rotor main body 17 is supported by the step portion 10b of the oil introducing portion 10, and the centrifugal rotor 11 is positioned in the vertical direction. The lid 18 is detachably attached to the lower portion of the rotor body 17. In addition, the lid 18 is provided with a plurality of raised portions 18a that protrude upward (for example, two) at a predetermined interval (for example, an interval of 180 degrees) along the circumferential direction. An injection nozzle 19 is provided on the raised portion 18a.

  The injection nozzle 19 is directed in a direction tangential to the centrifugal rotor 11 and in a direction inclined downward with respect to the horizontal. The centrifugal rotor 11 is rotated by the spray force of the oil sprayed from the spray nozzle 19.

  In the lower case 3, a metal disc-shaped baffle plate 20 is provided so as to cover the upper part of the oil level accumulated at the bottom of the lower case 3. As shown in FIGS. 2 and 3, the baffle plate 20 is provided with a plurality of passage holes 21 for oil passage and a cover portion 22 that covers the lower side of each passage hole 21. The passage hole 21 and the cover portion 22 are formed at the same time by bending an inner portion of a substantially U-shaped cut 27 formed in the baffle plate 20 downward. A plurality of the passage holes 21 are formed along the radial direction and the circumferential direction of the baffle plate 20. The plurality of passage holes 21 formed along the radial direction of the baffle plate 20 have larger hole areas in the centrifugal direction of the baffle plate 20. Further, a central hole 23 for oil passage is formed at the center of the baffle plate 20.

(2) Action of Centrifugal Oil Filter Next, the action of the filter 1A having the above configuration will be described.
As shown by solid line arrows in FIG. 1, the oil flowing into the housing 4 from the oil inlet 6 passes through the oil inlet 10 and is introduced into the centrifugal rotor 11 through the communication port 13 and the inlet 12. Is done. The introduction of the oil increases the oil pressure in the centrifugal rotor 11, and the oil is injected from the injection nozzle 19 toward the tangential direction of the centrifugal rotor 11. Then, the centrifugal rotor 11 is rotated in a predetermined direction (indicated by a broken line arrow in FIG. 1) by the injection force of the injection oil, and the foreign matter S such as sludge contained in the oil in the centrifugal rotor 11 is centrifuged by the rotation. It is separated and captured by the inner surface of the centrifugal rotor 11.
The foreign matter S captured on the inner surface of the centrifugal rotor 11 is removed by disassembling the housing 4 and the centrifugal rotor 11 and cleaning the inner surfaces of the rotor body 17 and the lid 18.

Part of the injection oil from the injection nozzle 19 collides with the baffle plate 20 and then drops to the bottom of the lower case 3 through the passage hole 21 and the center hole 23 and is discharged from the oil outlet 7 to the outside of the housing 4. Is done. Further, as indicated by solid line arrows in FIG. 3, a part of the injection oil from the injection nozzle 19 passes through the passage hole and collides with the cover part 22 to weaken its momentum. And is discharged from the oil outlet 7 to the outside of the housing 4.
The oil discharged from the oil outlet 7 to the outside of the housing 4 is collected in an oil pan of an engine (not shown) through an oil pipe 25 (see FIG. 1).

(3) Effect of Embodiment 1 As described above, in the filter 1A of Embodiment 1, the baffle plate 20 is provided in the bottom portion of the lower case 3, so that the injection oil from the injection nozzle 19 is transferred to the housing 4 by the baffle plate 20. The oil can be prevented from directly colliding with the oil level accumulated at the bottom of the oil, and the generation of bubbles in the oil can be suppressed. As a result, it is possible to prevent problems such as a decrease in oil life due to bubbles, poor engine lubrication, and a decrease in hydraulic pressure.

  Further, in the first embodiment, the baffle plate 20 is provided with the passage hole 21 for oil passage and the cover portion 22 that covers the lower side of the passage hole 21, so that part of the injection oil from the injection nozzle 19 is passed through the passage hole 21. Can be quickly dropped to the bottom of the lower case 3 after passing through and colliding with the cover portion 22 to weaken its momentum, and oil accumulation on the baffle plate 20 can be suppressed.

  In the first embodiment, a plurality of passage holes 21 are formed in the baffle plate 20 along the radial direction, and the hole areas of the plurality of passage holes 21 are increased in the centrifugal direction of the baffle plate 20. Therefore, oil that is diffused and injected from the injection nozzle 19 to the outer peripheral side of the baffle plate 20 at the time of high engine rotation or the like is applied to the bottom of the lower case 3 through the passage hole 21 having a relatively large hole area. It is dropped quickly. Thereby, it is possible to suitably cope with a case where a large amount of oil is desired to be circulated through the lubrication path at the time of high engine rotation or the like.

  Furthermore, in the first embodiment, the inner portion of the substantially U-shaped cut 27 formed in the baffle plate 20 is bent downward to form the passage hole 21 and the cover portion 22 at the same time. The cover part 22 can be created more easily.

( Reference example )
Next, a centrifugal oil filter (hereinafter simply abbreviated as “filter”) according to a reference example will be described. In the filter according to this reference example , the same components as those of the filter 1A of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The baffle plate which is the difference between the two is mainly described.

In the filter 1B according to this reference example , as shown in FIG. 4, a conical baffle plate 30 whose diameter is reduced downward is provided in the lower case 3 so as to cover the upper part of the oil level accumulated at the bottom of the lower case 3. Is provided. As shown in FIGS. 5 and 6, the baffle plate 30 is formed with a center hole 31 for oil passage at the center thereof. A spiral guide wall 32 for guiding oil on the baffle plate 30 is provided on the upper surface of the baffle plate 30. Further, the baffle plate 30 is formed with an oil passage passage hole 33 in the vicinity of the outer peripheral guide wall 32 of the adjacent guide walls 32.

(2) Operation of Centrifugal Oil Filter Next, the operation of the filter 1B having the above configuration will be described.
As shown in FIG. 4, a part of the injection oil from the injection nozzle 19 collides with the baffle plate 30, is guided by the guide wall 32 on the baffle plate 30, flows spirally, and then passes through the center hole 31. It is dropped to the bottom of the lower case 3 and discharged from the oil outlet 7 to the outside of the housing 4. Further, when the amount of oil injected from the injection nozzle 19 is relatively large at the time of high engine speed or the like, the oil flowing spirally on the baffle plate 30 passes through the passage hole 33 as shown by a solid line arrow in FIG. It is quickly dropped onto the bottom of the lower case 3 and discharged from the oil outlet 7 to the outside of the housing 4.

(3) From the above effect of the reference example, the filter 1B of the present embodiment, in addition to exhibiting the filter 1A substantially the same operation and effects of the first embodiment, the upper surface of the conical baffle plates 30, oil Since the oil that collided with the baffle plate 30 is guided on the baffle plate 30 by the guide wall 32 and flows in a spiral manner over time, the oil flowing on the baffle plate 30 is provided. Bubbles contained therein are naturally degassed, and generation of bubbles in the oil can be more reliably suppressed.

Further, in the above reference example , since the passage hole 33 for oil passage is formed in the baffle plate 30 in the vicinity of the guide wall 32 on the outer peripheral side of the adjacent guide walls 32, the injection nozzle 19 is used at the time of high engine speed or the like. When the amount of oil injected from the engine is relatively large, the oil flowing spirally on the baffle plate 30 is quickly dropped to the bottom of the housing 4 through the passage hole 33. This can be suitably handled when a large amount of oil is desired to be circulated.

In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the first embodiment and the reference example , the single baffle plates 20 and 30 are provided in the bottom of the lower case 3, but the present invention is not limited to this. For example, a plurality of baffle plates along the injection trajectory of the injection oil are provided. A single divided baffle plate may be provided.

In the first embodiment and the reference example , the foreign substance S to be centrifuged is captured by the inner surface of the centrifugal rotor 11. However, the present invention is not limited to this. For example, the inner cylinder for capturing the foreign substance in the centrifugal rotor 11. A filter medium or the like may be provided.

  Moreover, in the said Example 1, although the cover part 22 which covers the downward direction of the passage hole 21 was illustrated, it is not limited to this, For example, as shown with a virtual line in FIG. It is good also as part 22.

  Moreover, in the said Example 1, although the inside part of the substantially U-shaped notch 27 formed in the baffle plate 20 was bent and the cover part 22 was formed, it is not limited to this, For example, the baffle plate 20 A separate cover member may be retrofitted to the baffle plate 20.

  Moreover, in the said Example 1, although the disk-shaped baffle plate 20 was illustrated, it is not limited to this, For example, it is good also as the cone-shaped baffle plate 20 diameter-reduced below.

In the above reference example , the filter 1B including the conical baffle plate 30 provided with the guide wall 32 is exemplified, but the present invention is not limited to this, and for example, as shown in FIG. 7, no guide wall is provided. The filter 1 </ b> C including the conical baffle plate 40 may be used. Even in this case, since the oil colliding with the baffle plate 40 flows over the baffle plate 40 from the outer peripheral side toward the center side over time, it is dropped to the bottom of the housing 4 through the center hole 41. The bubbles contained in the oil flowing over 40 are naturally degassed, and the generation of bubbles in the oil can be more reliably suppressed.

Furthermore, in the above reference example , for example, as shown by the phantom line in FIG. 6, a two-stage structure in which another baffle plate 35 having substantially the same configuration as the baffle plate 30 is provided below the baffle plate 30. Alternatively, a two-stage structure in which the baffle plate 40 (see FIG. 7) is provided below the baffle plate 30 may be used. Moreover, in the said Example 1, it is good also as a two-stage structure which provides the said baffle plate 30 or the said baffle plate 40 under the baffle plate 20, for example.

  It is widely used as a filter for removing foreign substances contained in oil. In particular, it is suitably used as a filter for removing foreign matters such as sludge contained in engine oil.

1 is a longitudinal sectional view of a centrifugal oil filter according to Example 1. FIG. 3 is a plan view of a baffle plate according to Embodiment 1. FIG. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2. It is a principal part longitudinal cross-sectional view of the centrifugal oil filter which concerns on a reference example . It is a top view of the baffle plate concerning a reference example . FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 5. It is a principal part longitudinal cross-sectional view of the centrifugal oil filter of another form. It is a longitudinal cross-sectional view of the conventional centrifugal oil filter.

Explanation of symbols

  1A to 1C; centrifugal oil filter, 4; housing, 6; oil inlet, 7; oil outlet, 10; oil inlet, 11; centrifugal rotor, 19; injection nozzle, 20, 30, 40; 2, 33; Passing hole, 22; Cover, 23, 31; Center hole, 32; Guide wall.

Claims (3)

A housing having a bottomed cylindrical upper case having a lower opening, and a lower case removably attached to the upper case and having an oil inlet and an oil outlet formed therein;
A container-like centrifugal rotor rotatably supported in the housing;
Oil that extends upward from the center of the bottom of the lower case and has a hollow shaft shape that rotatably supports the centrifugal rotor, and has a lower end connected to the oil inlet and flows into the housing from the oil inlet. An oil introduction part for introducing the oil into the centrifugal rotor;
An injection nozzle that is provided in the centrifugal rotor and injects oil introduced into the centrifugal rotor in a direction tangential to the centrifugal rotor and inclined downward with respect to the horizontal ;
It is provided in the lower case so as to cover the upper part of the oil level accumulated at the bottom of the lower case, and the injection oil from the injection nozzle is prevented from directly colliding with the oil level accumulated at the bottom of the lower case. includes a baffle plate, the,
The baffle plate has an oil passage passage hole formed in an arc shape centered on the rotation axis of the centrifugal rotor, and an outer periphery side of the passage hole so as to cover a lower portion of the passage hole. A centrifugal oil filter, characterized in that a cover portion that is inclined and extended downward is provided . The centrifugal rotor according to claim 1, wherein the centrifugal rotor has a bottomed cylindrical rotor main body that is open at the bottom, and a lid that is detachably attached to a lower portion of the rotor main body and provided with the injection nozzle. Separable oil filter. Said baffle plate, along the radial direction and a plurality of the passing holes are formed, the hole area of the plurality of the passing holes is claim is greater toward the centrifugal direction of the baffle plate 1 or The centrifugal oil filter according to 2.

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