JP6669018B2 - Oil mist separator - Google Patents

Description

  The present invention relates to an oil mist separator, and more particularly, to an oil mist separator provided with a plurality of oil drain pipes having oil drain holes for discharging oil separated by an oil separating unit.

  As a conventional oil mist separator, for example, as shown in FIG. 7, a blow-by gas flow space formed by a cylinder head cover 103 opening on the cylinder head 102 side of the engine and a baffle plate 104 covering the opening of the cylinder head cover 103 An oil mist separator 101 provided with an oil separation section 111 for separating oil O contained in the blow-by gas G is generally known in the blow-by gas circulation space 105 (for example, Patent Document 1). reference). In the oil mist separator 101, oil drain pipes 115 and 116 are provided in an upstream area and a downstream area, respectively, of a partition wall 112 that constitutes an oil separating section 111, and separately in an upstream area and a downstream area having different oil separation properties. It has a structure that can drain oil.

JP 2005-120855 A No. 61-5309

  Here, the oil drain pipes 115 and 116 have a structure in which the accumulated oil itself blocks the oil drain holes 115a and 116a and the oil is discharged by its own weight when the oil accumulates to a certain amount or more. Therefore, a certain depth is required due to the above relationship. On the other hand, depending on the engine, there are cases where the depth of the oil drain pipes 115 and 116 cannot be ensured due to mechanical parts (for example, camshafts, cam retainers, etc.) of the cylinder head. In this case, for example, as shown in Patent Document 2, a check valve (also referred to as a "check valve") made of an elastic material such as rubber may be provided in the oil drain holes 115a and 116a. Can be However, when a check valve is provided in the configuration of the oil mist separator 101, a check valve is provided for each of the oil drain pipes 115 and 116, which increases the number of parts and increases the number of assembly steps. is there.

  The present invention has been made in view of the above situation, and has an object to provide an oil mist separator that can ensure sufficient oil drainage with a simple structure when a plurality of oil drain pipes are set. .

In order to solve the above problem, the invention according to claim 1 includes a blow-by gas flow space formed by a cylinder head cover that opens on the cylinder head side of the engine, and a baffle plate that covers the opening of the cylinder head cover. An oil separating portion for separating oil contained in the blow-by gas is provided in the blow-by gas distribution space, and an oil drain hole for discharging the oil separated by the oil separating portion is provided in the baffle plate. An oil mist separator provided with a plurality of oil drain pipes provided with a check valve provided so as to straddle at least two oil drain pipes, provided in each of the at least two oil drain pipes The plurality of oil drain holes are provided with one check valve. Thus the subject matter that are opened and closed to pass oil only to the discharge direction.
According to a second aspect of the present invention, in the first aspect of the present invention, the oil separation unit includes a partition wall that partitions the blow-by gas flow space into an upstream side and a downstream side, and the at least two oil drain pipes. One of the oil drain pipes is provided upstream of the partition wall in the blow-by gas flow direction, and the other drain pipe is provided downstream of the partition wall in the blow-by gas flow direction. The gist is that
According to a third aspect of the present invention, in the first or second aspect, the check valve includes a cap portion made of an elastic material, and the plurality of oil drain holes are opened and closed by elastic deformation of the cap portion. It is the gist that it is done.
According to a fourth aspect of the present invention, in the third aspect of the invention, the at least two oil drain pipes are provided with beams to connect the oil drain pipes to each other, and the check valve is A gist is provided that includes a core protruding from the cap portion and that the core is attached to the beam by being inserted into a mounting portion provided on the beam.
According to a fifth aspect of the present invention, in the fourth aspect, the mounting portion is a through hole formed in a direction intersecting a direction in which the oil drain pipe extends.
The invention according to claim 6 is the invention according to claim 4 or 5, wherein the beam portion is provided so as to connect side wall surfaces of the at least two oil drain pipes, and the at least two beam portions are provided. The gist is that the oil drain hole is provided at a position on an extension of the beam on each side wall surface of the oil drain pipe.

According to the oil mist separator of the present invention, the oil mist separator includes a check valve provided so as to straddle at least two oil drain pipes, and the plurality of oil drain holes provided in each of the at least two oil drain pipes includes one check valve. It can be opened and closed so that the oil passes only in the discharge direction. Thereby, when a plurality of oil drain pipes are set, sufficient oil drainage can be ensured with a simple structure.
Further, the oil separating portion includes a partition wall, one oil drain pipe is provided on the upstream side in the blow-by gas flow direction from the partition wall, and the other drain pipe is blow-by more than the partition wall. When provided on the downstream side in the gas flow direction, one check valve prevents backflow of oil in each oil drain hole of each oil drain pipe provided on the upstream and downstream sides of the partition wall. .
Further, when the check valve is provided with a cap portion made of an elastic material and the plurality of oil drain holes are opened and closed by elastic deformation of the cap portion, the check valve opening and closing operation is realized with a simpler structure. it can.
Further, a beam portion is provided on the at least two oil drain pipes so as to connect the oil drain pipes to each other, and the check valve includes a core portion protruding from the cap portion, and the core portion Is attached to the beam portion by being inserted into a mounting portion provided on the beam portion, the check valve can be attached with a simpler structure.
When the mounting portion is a through hole, the check valve can be mounted by pulling the core inserted into the through hole, and the reliability of mounting the check valve is improved.
Further, the beam portion is provided so as to connect side wall surfaces of the at least two oil drain pipes, and the oil drain hole is provided on each side wall surface at a position on an extension of the beam portion. If it is, a beam portion is provided over the side wall surface of each oil drain pipe, and the check valve is mounted sideways. Therefore, a sufficient space can be secured in the direction in which the core of the check valve is pulled, and the workability of mounting the check valve is improved. Further, the check valve attached to the beam portion can be easily visually checked, and the attached state can be easily confirmed.

The invention will be further described in the following detailed description, given by way of non-limiting example of an exemplary embodiment according to the invention and with reference to the referenced figures, wherein like reference numerals are used to refer to the figures. Similar parts are shown throughout the several figures.
It is a longitudinal section of an oil mist separator concerning an example. It is a principal part enlarged view of FIG. FIG. 3 is an enlarged cross-sectional view taken along line III-III of FIG. 2. FIG. 2 shows a state where the check valve is removed. It is a longitudinal section of an oil mist separator concerning other forms. It is a longitudinal section of an oil mist separator concerning other forms. It is a longitudinal section of the conventional oil mist separator.

  The matters shown here are for the purpose of exemplifying the exemplary embodiments and the embodiments of the present invention, and should be described so that the principles and conceptual features of the present invention can be most effectively and easily understood. It is intended to provide what seems to be possible. In this respect, it is not intended to show the structural details of the invention beyond that which is necessary for a fundamental understanding of the invention, and that some forms of the invention will be It will be clear to those skilled in the art how it is actually embodied.

<Oil mist separator>
The oil mist separator according to the present embodiment has a blow-by gas flow space ( 5), an oil separating portion (11) for separating oil contained in the blow-by gas is provided in the blow-by gas circulation space, and the baffle plate (4) is separated by the oil separating portion. An oil mist separator (1) provided with a plurality of oil drain pipes (15, 16) provided with oil drain holes (15a, 16a) for discharging oil (for example, see FIG. 1 and the like). A check valve (23, 23 ', 28) provided so as to straddle at least two oil drain pipes (15, 16), and a plurality of check valves provided in each of the at least two oil drain pipes (15, 16). The oil drain holes (15a, 16a) can be opened and closed by one check valve (23, 23 ', 28) so as to allow oil to pass only in the discharge direction (for example, FIGS. 3, 5 and 5). See FIG. 6 etc.).

  As the oil mist separator according to the present embodiment, for example, the oil separation section (11) includes a partition wall (12) that partitions the blow-by gas flow space (5) into an upstream side and a downstream side, and includes at least two oil mist separators. One oil drain pipe (15) of the drain pipes (15, 16) is provided upstream of the partition wall (12) in the blow-by gas flow direction, and the other drain pipe (16) is A mode provided on the downstream side of the partition wall (12) in the blow-by gas flow direction (for example, see FIG. 1 and the like) can be given. When the number of the oil drain pipes is three or more, usually, a plurality of one oil drain pipes and / or the other oil drain pipes are provided.

  In the case of the above-described embodiment, for example, a nozzle hole (12a) for injecting blow-by gas toward the downstream side is formed in the partition wall (12), and the oil separating portion (11) is provided with the nozzle hole (12a). ) Can be provided (for example, see FIG. 1 and the like).

  As the oil mist separator according to the present embodiment, for example, the check valves (23, 23 ′) include a cap portion (24) made of an elastic material, and a plurality of oil drain holes (15a) are formed by elastic deformation of the cap portion. , 16a) can be opened and closed (for example, see FIGS. 3 and 5).

  In the case of the above-described embodiment, for example, the beam portion (17) is provided in the at least two oil drain pipes (15, 16) so as to connect the oil drain pipes, and the check valves (23, 23 ′) are provided. ) Has a core (25) projecting from the cap (24), and is attached to the beam by inserting the core (25) into an attachment (18) provided on the beam (17). (See, for example, FIGS. 3 and 5).

  In the case of the above-described embodiment, for example, the mounting portion (18) can be a through hole that is drilled in a direction that intersects with the direction in which the oil drain pipes (15, 16) extend (see, for example, FIG. 3 and the like). .

  In the case of the above embodiment, for example, the beam portion (17) is provided so as to connect the side wall surfaces (15b, 16b) of at least two oil drain pipes (15, 16), and at least two oil drain pipes are provided. Oil drain holes (15a, 16a) may be provided on the side walls (15b, 16b) of (15, 16) at positions on the extension of the beam (17) (for example, FIG. 3). Etc.).

  In the case of the above embodiment, for example, the beam portion (17) may be provided with an oil guide (21) for collecting and dropping the oil discharged from the plurality of oil drain holes (15a, 16a). (For example, see FIG. 4 and the like). Thereby, the oil can be dropped to a predetermined target location.

  It should be noted that reference numerals in parentheses of each configuration described in the above-described embodiment indicate a correspondence relationship with a specific configuration described in Examples described later.

  Hereinafter, the present invention will be described specifically with reference to the drawings.

(1) Configuration of Oil Mist Separator As shown in FIG. 1, an oil mist separator 1 according to the present embodiment includes a cylinder head cover 3 that opens on the cylinder head 2 side of an engine, and a baffle plate 4 that covers the opening of the cylinder head cover 3. And a blow-by gas distribution space 5 formed by the above. The baffle plate 4 has an inlet 7 through which the blow-by gas G generated by the engine flows into the blow-by gas flow space 5. The cylinder head cover 3 has an outlet 8 through which the blow-by gas G from which the oil O is separated from the blow-by gas flow space 5 flows out.

  In the blow-by gas circulation space 5, an oil separating section 11 for separating oil O contained in the blow-by gas G is provided. The oil separating portion 11 partitions the blow-by gas distribution space 5 into an upstream side and a downstream side, and has a partition wall 12 formed with one or more nozzle holes 12a for injecting the blow-by gas G toward the downstream side, A collision wall 13 provided to face the nozzle hole 12a. The collision wall 13 is made of a filter through which the blow-by gas G can pass.

  As shown in FIGS. 2 and 3, the baffle plate 4 has a plurality of oil drain pipes 15 and 16 having oil drain holes 15a and 16a for discharging the oil separated by the oil separating unit 11 (2 in the drawings). Book) is provided. These oil drain pipes 15 and 16 extend downward from the baffle plate 4. The one oil drain pipe 15 is provided upstream of the partition wall 12 in the blow-by gas flow direction. Further, the other drain pipe 16 is provided downstream of the partition wall 12 in the blow-by gas flow direction.

  The oil drain pipes 15, 16 are provided with beams 17 so as to connect the side walls 15b, 16b to each other (see FIG. 3). The beam portion 17 is formed in a shape such that a peripheral edge side of a cap portion 24 of a check valve 23 to be described later can contact with the side wall surfaces 15 b and 16 b of the oil drain pipes 15 and 16. The beam portion 17 is provided with a mounting portion 18 for mounting a check valve 23 described later. The mounting portion 18 is a through hole formed in a direction intersecting (specifically, orthogonally) to the direction in which the oil drain pipes 15 and 16 extend. The side walls 15b and 16b of the oil drain pipes 15 and 16 are on the extension of the beam 17 (specifically, on the extension of the cross section of the beam 17 cut along a horizontal plane passing through the axis of the mounting portion 18). Are provided with oil drain holes 15a and 16a. These oil drain holes 15a, 16a have a substantially crescent shape in plan view. Further, the beam portion 17 is provided with an oil guide 21 for collecting and dropping the oil discharged from the plurality of oil drain holes 15a and 16a. The oil guide 21 is raised from the beam portion 17 and the side wall surfaces 15b, 16b of the oil drain pipes 15, 16 so as to surround a cap portion 24 of the check valve 23 described later (see FIG. 4).

  The oil mist separator 1 includes a check valve 23 (also referred to as a “check valve”) provided so as to straddle the oil drain pipes 15 and 16. The check valve 23 is made of an elastic material (for example, rubber, resin, or the like), and includes a cap portion 24 and a rod-shaped core portion 25 protruding from the center of the cap portion 24. The core portion 25 is provided with a projection 25a bulging toward the centrifugal side at an intermediate portion in the axial direction. The check valve 23 is mounted laterally on the beam 17 with the core 25 inserted into the mounting 18. Specifically, by pinching and pulling the shaft end side 25b of the core portion 25 inserted into the mounting portion 18, the projection 25a passes through the mounting portion 18 by elastic deformation and returns to the original shape, and The check valve 23 is attached to the beam portion 17 while being locked to the outer peripheral side.

  The check valve 23 is capable of opening and closing the plurality of oil drain holes 15a and 16a so as to allow oil to pass only in the discharge direction. Specifically, the plurality of oil drain holes 15a, 16a are closed by bringing the peripheral edge side of the cap portion 24 into contact with the beam portion 17 and the side wall surfaces 15b, 16b of the plurality of oil drain pipes 15, 16. On the other hand, the cap portion 24 is elastically deformed by the action of the negative pressure or the like of the intake system, and the peripheral edge of the cap portion 24 is separated from the beam portion 17 and the side wall surfaces 15b, 16b of the plurality of oil drain pipes 15, 16; The plurality of oil drain holes 15a and 16a are opened.

(2) Operation of Oil Mist Separator Next, the operation of the oil mist separator 1 having the above configuration will be described. The blow-by gas G generated in the engine flows into the blow-by gas flow space 5 from the inflow port 7 by the action of the negative pressure of the intake system or the like and collides with the partition wall 12, as indicated by a broken arrow in FIG. This separates the oil. Further, the blow-by gas G injected toward the downstream side from the nozzle hole 12a of the partition wall 12 collides with the collision wall 13 and passes therethrough, whereby oil is separated. Then, the blow-by gas G from which the oil has been sufficiently separated is sent to the intake system via the outlet 8.

  Here, in the oil separation section 11, the oil separation performance on the downstream side of the partition wall 12 is higher than the oil separation performance on the upstream side of the partition wall 12. The oil O separated and collected on the upstream side of the partition wall 12 of the oil separating section 11 is stored in the oil drain pipe 15. The oil separated and collected on the downstream side of the partition wall 12 of the oil separating section 11 is stored in the oil drain pipe 16. The oil O stored in each of the drain pipes 15 and 16 is indicated by phantom lines in FIGS. 3 and 4 when the cap portion 24 of the check valve 23 is elastically deformed by the action of negative pressure of the intake system or the like. As indicated by arrows, the oil is discharged from the oil drain holes 15a and 16a, guided by the oil guide 21, and dropped to a predetermined target location.

(3) Effects of Embodiment According to the oil mist separator 1 of this embodiment, the check valve 23 is provided so as to straddle the two oil drain pipes 15 and 16, and is provided for each of the oil drain pipes 15 and 16. The plurality of oil drain holes 15a and 16a can be opened and closed by one check valve 23 so as to allow oil to pass only in the discharge direction. Thereby, when a plurality of oil drain pipes 15 and 16 are set, sufficient oil drainage can be secured with a simple structure.

  In the present embodiment, the oil separating section 11 includes a partition wall 12, and one oil drain pipe 15 is provided on the upstream side of the partition wall 12 in the blow-by gas flow direction, and the other drain pipe 16 is provided. Is provided downstream of the partition wall 12 in the blow-by gas flow direction. Thereby, the one check valve 23 prevents the backflow of the oil in the oil drain holes 15a and 16a of the oil drain pipes 15 and 16 provided on the upstream side and the downstream side of the partition wall 12, respectively.

  In the present embodiment, the check valve 23 includes a cap portion 24 made of an elastic material, and the plurality of oil drain holes 15a and 16a are opened and closed by the elastic deformation of the cap portion 24. Thereby, the opening and closing operation of the check valve 23 can be realized with a simpler structure.

  In this embodiment, the two oil drain pipes 15 and 16 are provided with beams 17 so as to connect the oil drain pipes 15 and 16, and the check valve 23 projects from the cap portion 24. A core portion 25 is provided, and the core portion 25 is attached to the beam portion 17 by being inserted into an attachment portion 18 provided on the beam portion 17. Thereby, the check valve 23 can be attached with a simpler structure.

  Further, in the present embodiment, the mounting portion 18 is a through hole. Thereby, the check valve 23 can be attached by pulling the core portion 25 inserted into the through hole 18, and the reliability of the attachment of the check valve 23 is improved.

  Further, in this embodiment, the beam portion 17 is provided so as to connect the side wall surfaces 15b, 16b of the oil drain pipes 15, 16, and the respective side wall surfaces 15b, 16b are provided on the extension line of the beam portion 17. Oil drain holes 15a and 16a are provided at positions. Thereby, the beam part 17 is provided over the side wall surfaces 15b, 16b of the oil drain pipes 15, 16, and the check valve 23 is mounted laterally. Therefore, a sufficient space can be secured in the direction in which the core 25 of the check valve 23 is pulled, and the workability of mounting the check valve 23 is improved. Further, the check valve 25 attached to the beam portion 17 can be easily visually checked, and the attached state can be easily confirmed.

  Further, in this embodiment, the beam portion 17 is provided with an oil guide 21 for collecting and dropping the oil discharged from the plurality of oil drain holes 15a and 16a. Thereby, the oil can be dropped to a predetermined target location.

  It should be noted that the present invention is not limited to the above-described embodiment, but may be variously modified within the scope of the present invention according to the purpose and application. That is, in the above-described embodiment, the check valve 23 that straddles the two oil drain pipes 15 and 16 is exemplified. However, the present invention is not limited to this. For example, a check valve that straddles three or more oil drain pipes may be used.

  Further, in the above-described embodiment, the check valve 23 that is laterally attached to the beam portion 17 that connects the side wall surfaces 15b and 16b of the plurality of oil drain pipes 15 and 16 is exemplified. However, the present invention is not limited thereto. As shown in (1), a check valve 23 'may be attached vertically to the beam portion 17 connecting the bottom wall surfaces 15c, 16c of the plurality of oil drain pipes 15, 16. In this case, the oil drain holes 15a, 16a are usually formed in bottom wall surfaces 15c, 16c of the oil drain pipes 15, 16.

  Further, in the above-described embodiment, the check valve 23 including the cap portion 24 made of an elastic material is exemplified. However, the present invention is not limited to this. For example, as shown in FIG. 6, a plurality of oil drain holes 15a and 16a are closed. The check valve 28 may include an opening / closing plate 27 that is swingably supported between the open position and the open position. The opening / closing plate 27 is swung between respective positions according to the amount of oil accumulated in the plurality of oil drain pipes 15 and 16 (that is, the weight of the oil).

  Further, in the above-described embodiment, a through hole is illustrated as the mounting portion 18 into which the core portion 25 of the check valve 23 is inserted. However, the present invention is not limited to this. For example, a concave portion or a slit may be employed as the mounting portion 18. .

  Further, in the above-described embodiment, the collision wall 13 made of a filter through which the blow-by gas can pass is exemplified. However, the collision wall 13 is not limited to this. A collision wall may be formed by providing a wall portion on the side on which blow-by gas cannot pass.

  Further, in the above-described embodiment, the collision separation type oil separation unit 11 is exemplified. However, the invention is not limited thereto. For example, one of a collision separation type, a filtration separation type, a maze separation type, a centrifugal separation type, or the like, or The oil separation unit may be a combination of two or more types.

  Furthermore, in the above-described embodiment, the oil mist separator 1 having one set of the structure including the check valve 23 that straddles the plurality of oil drain pipes 15 and 16 is exemplified. However, the present invention is not limited thereto. The oil mist separator may be provided with two or more sets of the check valve 23 that straddles the pipes 15 and 16.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is understood that the language used in the description and illustration of the invention is illustrative and not restrictive. As detailed herein, changes may be made within the scope of the appended claims without departing from the scope or spirit of the invention in its form. Although reference has been made herein to particular structures, materials and examples in the description of the invention, it is not intended that the invention be limited to the disclosure herein, but rather that the invention be limited by the appended claims. It covers all functionally equivalent structures, methods, and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope shown in the claims of the present invention.

  The present invention is widely used as a technique for separating oil contained in blow-by gas generated in an engine.

  DESCRIPTION OF SYMBOLS 1; Oil mist separator, 2; Cylinder head, 3; Cylinder head cover, 4; Baffle plate, 5; Blow-by gas circulation space, 11; Oil separation part, 12; Partition wall, 15, 16; Oil drain pipe, 15a, 16a Oil drain holes, 15b, 16b; side wall surfaces, 17; beams, 18; mounting portions, 23, 23 ', 28; check valves, 24; caps, 25;

Claims (6)

A blow-by gas distribution space formed by a cylinder head cover that opens to the cylinder head side of the engine and a baffle plate that covers the opening of the cylinder head cover, wherein oil contained in the blow-by gas An oil mist separator provided with an oil drain pipe provided with an oil drain hole for discharging the oil separated by the oil separating section is provided on the baffle plate. hand,
A check valve provided so as to straddle at least two of the oil drain pipes,
The plurality of oil drain holes provided in each of the at least two oil drain pipes can be opened and closed by one check valve so as to allow oil to pass only in a discharge direction. Mist separator. The oil separation unit includes a partition wall that partitions the blow-by gas flow space into an upstream side and a downstream side,
One oil drain pipe of the at least two oil drain pipes is provided upstream of the partition wall in the blow-by gas flow direction, and the other drain pipe is blow-by gas lower than the partition wall. The oil mist separator according to claim 1, which is provided on a downstream side in a flow direction.   The oil mist separator according to claim 1, wherein the check valve includes a cap portion made of an elastic material, and the plurality of oil drain holes are opened and closed by elastic deformation of the cap portion. A beam portion is provided on the at least two oil drain pipes so as to connect the oil drain pipes to each other,
4. The oil according to claim 3, wherein the check valve has a core protruding from the cap portion, and is attached to the beam by inserting the core into a mounting portion provided on the beam. 5. Mist separator.   The oil mist separator according to claim 4, wherein the attachment portion is a through hole formed in a direction intersecting a direction in which the oil drain pipe extends. The beam portion is provided so as to connect side wall surfaces of the at least two oil drain pipes,
The oil mist separator according to claim 4, wherein the oil drain hole is provided on a side wall surface of each of the at least two oil drain pipes at a position on an extension of the beam.

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