CN110945217B - Oil separator structure of engine - Google Patents
Oil separator structure of engine Download PDFInfo
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- CN110945217B CN110945217B CN201880048433.0A CN201880048433A CN110945217B CN 110945217 B CN110945217 B CN 110945217B CN 201880048433 A CN201880048433 A CN 201880048433A CN 110945217 B CN110945217 B CN 110945217B
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- oil
- oil reservoir
- partition plate
- camshaft
- engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0461—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a labyrinth
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0488—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with oil trap in the return conduit to the crankcase
- F01M2013/0494—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with oil trap in the return conduit to the crankcase using check valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The oil separator structure of an engine of the present invention includes a bowl-shaped head cover and a partition plate. The partition plate is a plate body that is provided so as to close a part of the opening in the cover and that forms a passage for blow-by gas between the partition plate and the cover. An oil storage container for storing the separated and liquefied oil is provided on the side opposite to the cover in a portion where the partition plate is opened. The wall surface of the oil reservoir is formed in a convex shape protruding inward of the cover. In the oil reservoir, a drain valve is provided at a bottom side portion of a side wall surface portion along a depth direction of the oil reservoir.
Description
Technical Field
The present invention relates to an oil separator structure of an engine.
Background
In an engine mounted on a vehicle such as an automobile, blow-by gas leaks into a crankcase as combustion in a combustion chamber. Conventionally, a configuration has been adopted in which such blow-by gas is returned to an intake system after removing oil mist contained therein and is returned to a combustion chamber (patent documents 1 and 2)
Further, patent document 2 discloses a structure in which a cyclone oil separator is provided outside an engine. In this structure, the blow-by gas is introduced into a cyclone chamber, and the blow-by gas is turned into a swirling flow in the cyclone chamber to liquefy the oil mist, so that the oil is separated and recovered.
Further, in the oil separator structure of patent document 2, the oil stored in the injector chamber can be recovered to the cyclone chamber via a drain valve (check valve).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2009-121281
Patent document 2: japanese patent laid-open publication No. Hei 11-264312
Disclosure of Invention
However, in recent years, further improvement in engine power is desired, and the combustion pressure of the engine tends to increase. If the combustion pressure is increased in this manner, the amount of blow-by gas generated also increases. Therefore, if the engine power is increased, the blow-by gas treatment capacity needs to be further improved than before, and there is a demand for improvement in the separation and recovery capacity of oil contained in the gas.
Further, the proportion of the volume occupied by the engine in the vehicle is limited aerodynamically and in appearance, and therefore, it is required to improve the treatment capability of the blow-by gas and to avoid an increase in the size of the engine.
The present invention has been made to solve the above-described problems, and an object thereof is to provide an oil separator structure for an engine, which can improve the blow-by gas treatment capability and suppress an increase in size of the engine.
An oil separator structure for an engine according to an aspect of the present invention is an oil separator structure for liquefying oil mist contained in blow-by gas so as to separate and recover oil, the oil separator structure being provided in a cylinder head of the engine, the oil separator structure including: a bowl-shaped cover; and a partition plate provided so as to close a part of an opening portion in the head cover, and forming a passage for the blow-by gas between the partition plate and the head cover, wherein a part of the partition plate is open, an oil reservoir tank for storing the separated and liquefied oil is provided on a side opposite to the head cover in the part where the partition plate is open, a drain valve is provided in a side wall surface portion extending in a depth direction of the oil reservoir tank, a wall surface portion of the oil reservoir tank is formed in a convex shape protruding into the head cover, a part of the wall surface portion of the oil reservoir tank extending along a rotation locus of the camshaft at an interval is formed in an arc shape when viewed from an axial direction of the camshaft disposed in the cylinder head, and the oil reservoir tank is provided extending in an extending direction of the camshaft, the oil reservoir container has a wall surface portion that is formed in a shape of a continuous projection and recess in a radial direction of the camshaft, and the drain valve is provided in a bottom-most portion of the wall surface portion of the oil reservoir container in the depth direction.
Drawings
Fig. 1 is a schematic cross-sectional view showing a structure in a cylinder head of an engine according to an embodiment.
Fig. 2 is a view showing a section ii-ii of fig. 1, and is a schematic sectional view showing a structure in a cylinder head.
Fig. 3 is a schematic sectional view showing the structure of the oil separator in the cylinder head.
Fig. 4 is a view showing a section iv-iv of fig. 1, and is a schematic sectional view showing a structure of an oil separator in a cylinder head.
Fig. 5 is a schematic perspective view showing the structure of a partition plate of the oil separator structure.
Fig. 6 is a schematic perspective view showing a partition plate structure and a cloth member structure of the oil separator structure.
Fig. 7 is a schematic sectional view showing a partial structure of the oil separator structure in the cylinder head.
Fig. 8 is a schematic cross-sectional view showing a partial structure of the in-cylinder-head oil separator structure.
Fig. 9 is a schematic cross-sectional view showing the arrangement relationship between the boss and the oil reservoir in the cylinder head.
Fig. 10 is a schematic cross-sectional view showing the arrangement relationship between the boss and the oil reservoir in the cylinder head.
Fig. 11 is a schematic diagram showing the structure of the oil container according to the embodiment.
Fig. 12 is a schematic diagram showing the structure of an oil container according to a comparative example.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the embodiments except for the essential structure thereof.
[ embodiment ]
1. Structure of cylinder head 2 in engine 1
The structure of the cylinder head 2 in the engine 1 according to the embodiment will be described with reference to fig. 1 and 2.
As shown in fig. 1, in a cylinder head 2 in an engine 1, a camshaft 6 extending in the X direction is provided. As shown in fig. 2, the cylinder head 2 is further provided with a camshaft 7 in parallel with the camshaft 6.
As shown in fig. 1, the camshaft 6 includes a hollow shaft portion 6a and a cam portion 6b that is also hollow, and the shaft portion 6a and the cam portion 6b are arranged in the X direction. The cam portion 6b has a diameter larger than that of the shaft portion 6 a.
As shown in fig. 1 and 2, a bowl-shaped head cover 3 is provided to cover the upward Z direction of the cam shaft 6 and the cam shaft 7. The head cover 3 constitutes the Z-direction upper portion of the cylinder head 2. The partition plate 4 is joined to the Z-direction lower portion of the cover 3.
The partition plate 4 is provided so as to close a part of the opening of the cover 3 in the Z direction lower side, and a blow-by gas passage is formed between the partition plate 4 and the cover 3. An oil separator portion (oil separator structure) 5 is provided in the blow-by gas passage.
A blow-by gas discharge passage 8 extends from the X-direction right side portion of the head cover 3. The PCV valve 9 is incorporated in the discharge passage 3, not shown in detail.
As shown in fig. 2, an oil reservoir 41 having a convex shape protruding into the cover 3 is provided on the partition plate 4 on the side opposite to the cover 3, i.e., on the lower side in the Z direction. The oil reservoir 41 is a container for storing oil obtained by separating and liquefying oil mist contained in blow-by gas. A part of the side wall surface portion of the oil reservoir 41 is disposed with a gap radially outward with respect to the camshaft 5.
2. Structure of oil storage container 41
The structure of the oil container 41 will be described with reference to fig. 3 and 4.
As shown in fig. 3, the oil reservoir 41 is provided at a lower portion of the partition plate 4, and a bottom portion thereof is disposed at a right portion in the Y direction with respect to the camshaft 6 (not shown in fig. 3 and 4). As shown in fig. 3 and 4, the opening of the oil reservoir 41 in the Z direction is closed by a lid member 44.
As shown in fig. 3, a recovery hole 42 that communicates the internal space of the oil reservoir 41 with the blow-by gas passage in the Z direction upward of the partition plate 4 is provided in the lid member 44. In the oil separator structure of the engine 1 according to the present embodiment, the two recovery holes 42 are provided in the cover member 44.
As shown in fig. 3, the inner wall surface portion 41a on the left side in the Y direction of the oil reservoir 41 is formed to follow the rotation locus of the camshaft 6 with a gap, specifically, formed in an arc shape. As shown in fig. 4, the inner wall surface portion 41a of the oil reservoir 41 is formed so that a portion recessed in the radial direction of the camshaft 6 and a portion protruding therefrom are continuous in the extending direction (X direction) of the camshaft 6, and has a generally irregular shape.
As shown in fig. 3, a drain valve 43 is provided on the outer wall surface portion 41b on the right side in the Y direction of the oil reservoir 41 at the lower side in the Z direction (the bottom side of the reservoir). The drain valve 43 is a check valve (check valve).
Further, the drain valve 43 is provided on the lowermost side in the Z direction in the outer wall surface portion 41b of the oil reservoir 41.
3. Structure of partition plate 4
The structure of the partition plate 4 other than the oil reservoir 41 described above will be described with reference to fig. 5 and 6. Fig. 5 and 6 are schematic perspective views showing the structure of the partition plate 4, and fig. 5 and 6 are views seen from opposite sides in the X direction to each other.
As shown in fig. 5 and 6, the partition plate 4 includes a main body 40 as a plate body, the oil reservoir tank 41, the drain valve 43, a lid member 44, a separation wall portion 45, a throttle wall portion 46, a fabric member 47, and a drum portion 49.
The body portion 40 has a substantially rectangular shape elongated in the X direction which is the extending direction of the camshaft 6. Further, in the main body portion 40, a recovery hole 48 is opened in a portion between the separation wall portion 45 and the throttle wall portion 46 in the X direction, and an opening in the upper portion of the oil reservoir 41 is opened in a portion on the downstream side in the flow direction of the blow-by gas with respect to the throttle wall portion 46. A recovery tube portion 49 is provided below the recovery hole 48 in the Z direction, and the separated oil passes through the recovery hole 48 and the recovery tube portion 49 and returns to the crankcase.
In fig. 5 and 6, the opening of the upper portion of the oil reservoir 41 is shown in a closed state by the lid member 44, and therefore the opening of the upper portion of the oil reservoir 41 is not shown.
The lid member 44 is provided in a region slightly lower than the main surface of the body 40 on the upper side in the Z direction. In other words, the peripheral portion of the portion where the lid member 44 is provided is formed in a slope so that the main surface of the main body 40 on the upper side in the Z direction is in a mortar shape. This allows the liquefied oil to be smoothly recovered in the oil reservoir 41.
The separation wall 45 is formed upward in the Z direction from the main surface of the body 40 on the upper side in the Z direction. The separation wall 45 is formed integrally of two plate portions provided in the Y-Z plane direction and a connecting plate portion connecting the two plate portions. As described later, the separation plate portion 45 is combined with the hanging plate portion 31 of the head cover 3 to form a labyrinth structure, whereby the oil mist contained in the blow-by gas can be liquefied by its own weight and captured.
As shown in fig. 6, the throttle wall portion 46 is formed upward in the Z direction from the main surface of the body portion 40 on the upper side in the Z direction, and has a substantially trapezoidal shape when viewed from the front in the X direction. The throttle wall 46 is provided with a communication hole 46a penetrating in the X direction.
As described later, the engagement plate portion 32 of the cover 3 is engaged with the outer peripheral portion of the throttle wall portion 46 in an airtight state. Therefore, the passage of the blow-by gas is partitioned into two chambers on both sides in the X direction by the throttle wall portion 46. Also, communicating between the two chambers is a communication hole 46 a.
In the present embodiment, three communication holes 46a are opened in the throttle wall portion 46. The three communication holes 46a are arranged in the Y direction.
The cloth member 47 is a trapping member for trapping oil mist, and is disposed on the downstream side in the flow direction of the blow-by gas with respect to the throttle wall portion 46. As shown by the portion circled by the two-dot chain line in fig. 6, the cloth member 47 is integrally formed by two side surface portions 47a, 47b facing each other, an upper surface portion 47c at the upper portion in the Z direction, and a front surface portion 47d at the back side in the X direction.
The fabric member 47 is disposed in a state where a part of the throttle wall portion 46 enters from the opening portion 47 e. In this case, a gap SP is left between the front surface portion 47d of the fabric member 47 and the throttle wall portion 46.
In the present embodiment, the fabric member 47 is formed of a nonwoven fabric, for example.
4. Separation and recovery of oil mist
The structure of separating and collecting the oil mist in the oil separator unit 5 will be described with reference to fig. 7 and 8. Fig. 7 is a schematic cross-sectional view showing a partial structure of a chamber on the upstream side in the flow direction of the blow-by gas in the oil separator unit 5 (hereinafter, sometimes referred to as an "upstream side chamber"), and fig. 8 is a schematic cross-sectional view showing a partial structure of a chamber on the downstream side in the flow direction of the blow-by gas in the oil separator unit 5 (hereinafter, sometimes referred to as a "downstream side chamber").
First, as shown in fig. 7, a plurality of hanging plate portions 31 hanging downward in the Z direction from the inner side of the cover 3 are provided in the upstream chamber. In the upstream chamber, the separation wall portion 45 of the partition plate 4 and the suspended plate portion 31 of the cover 3 are engaged with each other with a space therebetween, and the labyrinth structure is configured as described above.
As shown by arrows in fig. 7, the blow-by gas introduced into the oil separator portion 5 passes through a labyrinth structure portion constituted by a combination of the separation wall portion 45 and the suspended plate portion 31 in the upstream side chamber. At this time, the flow path of the blow-by gas is bent by the labyrinth structure, and the oil is separated by the wall barrier and the self weight of the oil mist. Then, the liquefied and separated oil is recovered from the recovery hole 48 to the recovery cylinder 49.
Next, as shown in fig. 8, a communication hole 46a for allowing the blow-by gas to pass therethrough is opened in the throttle wall portion 46 which is the upstream end of the downstream side chamber.
In addition, as described above, the passage of the blowby gas between the upstream side chamber and the downstream side chamber is not limited to the communication hole 46 a. That is, the throttle wall portion 46 is joined to the joint plate portion 32 of the cover 3, and thereby the upstream side chamber and the downstream side chamber are hermetically blocked at a portion other than the communication hole 46 a.
As shown in fig. 8, the flow rate of the blow-by gas increases as it passes through the communication hole 46 a. Then, the accelerated blow-by gas collides against the fabric member 47 disposed to face each other with the gap SP therebetween. By this collision, the oil mist contained in the blow-by gas is caught by the cloth member 47. Further, with the above configuration, the oil mist trapped in the downstream side chamber contains a component having a finer particle size than that of the upstream side chamber.
The oil mist trapped in the downstream chamber is liquefied and then falls down to the main body 40 of the partition plate 4 (see fig. 5 and 6), and is collected from the collection hole 42 into the oil reservoir 41 (see fig. 3).
5. Oil recovery and discharge to the oil storage container 41
The oil recovery from the oil reservoir 41 and the oil discharge from the oil reservoir 41 to the crankcase will be described with reference to fig. 9 and 10. Fig. 9 is a schematic cross-sectional view showing a cross-section of the shaft portion 6a in the camshaft 6, and fig. 10 is a schematic cross-sectional view showing a cross-section of the cam portion 6b in the camshaft 6.
As shown in fig. 9 and 10, the oil reservoir 41 is formed in an arc shape such that the inner wall surface portion 41a follows each rotation locus of the shaft portion 6a and the cam portion 6b in the camshaft 6. Then, as shown in fig. 9, the oil reservoir 41 is formed to have a relatively large depth in a portion corresponding to the small-diameter shaft body portion 6a of the camshaft 6. This is because the inner wall surface portion 41a of the oil reservoir 41 projects from the surrounding portion (the portion corresponding to the cam portion 6 b) when viewed from the X direction.
As shown in fig. 9, the drain valve 43 is provided in the outer wall surface portion 41b at a deep portion of the oil reservoir 41.
On the other hand, as shown in fig. 10, the oil reservoir 41 is formed to have a relatively shallow depth in a portion corresponding to the shaft body portion 6b of the camshaft 6 having a large diameter. This is because the inner wall surface portion 41a of the oil reservoir 41 is recessed from the surrounding portion (portion corresponding to the shaft body portion 6 a) when viewed from the X direction.
The oil recovered from the recovery hole 42 into the oil reservoir 41 is stored in the oil reservoir 41 while the drain valve 43 is in the closed state. When the drain valve 43 is opened, the oil is returned from the oil reservoir 41 to the crankcase. In this case, since the inner wall surface portion 41a has an arc shape, the oil in the oil reservoir 41 can be smoothly discharged from the drain valve 43.
In the present embodiment, the inner wall surface portion 41a of the oil reservoir 41 is formed in an arc shape, but may be formed in a stepped shape. In this case, in order to suppress the oil from remaining in the oil reservoir 41, it is preferable that the inner wall surface portion is formed by a combination of wall surfaces that are inclined downward.
Here, the opening and closing operation of the drain valve 43 will be described. The open state and the closed state of the drain valve 43 are determined by the relative magnitude relationship between the pressure in the crankcase and the pressure in the downstream side chamber in the oil separator unit 5. Specifically, when the engine is driven, the downstream side chamber is often subjected to negative pressure with respect to the crankcase. In this case, the drain valve 43 is closed, and the separated and recovered oil is stored in the oil reservoir 41.
On the other hand, when the engine is stopped, the downstream side chamber becomes a positive pressure with respect to the inside of the crankcase. In this case, the drain valve 43 is opened, and the oil stored in the oil reservoir 41 is returned to the crankcase.
6. Position of drain valve 43 in oil reservoir 41
The position of the drain valve 43 in the oil container 41 will be described with reference to fig. 11 and 12. Fig. 11 is a schematic diagram schematically showing the configuration of an oil storage container 41 according to the present embodiment, and fig. 12 is a schematic diagram schematically showing the configuration of an oil storage container 941 according to a comparative example.
First, as shown in fig. 11, in the oil container 41 according to the present embodiment, the drain valve 43 is provided on the outer wall surface portion 41b which faces the inner wall surface portion 41a having an arc shape on the opposite side in the Y direction. Thus, the oil container 41 according to the present embodiment can set the depth H of the container regardless of the outer diameter of the drain valve 4341Designed to be deeper.
In addition, in the oil storage container 41, the depth H can be adjusted41Is designed deep to reach the liquid level L of the stored oil from the lower end of the drain valve 43OILHeight H ofOILHigh, so that the oil can be smoothly discharged from the drain valve 43.
Next, as shown in fig. 12, a drain valve 943 is provided in the bottom portion of the oil storage tank 941 according to the comparative example, below in the Z direction. Thus, the outer diameter D of the drain valve 943 of the oil storage tank 941 according to the comparative example is larger than that of the oil storage tank 941943Of the depth H of the container941Has to be made shallow.
Thus, in the oil storage tank 941 according to the comparative example, the oil level L from the bottom of the tank where the drain valve 943 is provided to the stored oil is reachedOILHeight H ofOILAnd also becomes shallow. Therefore, in the oil reservoir 941 according to the comparative example, the discharge of the oil from the drain valve 943 is not smooth as compared with the oil reservoir 41 according to the embodiment.
7. Effect
In the oil separator unit (oil separator structure) 5 of the engine 1 according to the present embodiment, the wall surface portion of the oil reservoir 41 is formed in a convex shape protruding into the head cover 3, the drain valve 43 is not provided on the bottom wall surface in the oil reservoir 41,and is provided at the bottom side portion of the outer side wall portion 41 b. This makes it possible to increase the container depth H of the oil reservoir 4141Accordingly, the amount of storable oil can be increased, and the separated and recovered oil can be smoothly discharged when the drain valve 43 is in the open state.
Therefore, in the oil separator section 5 of the engine 1 according to the present embodiment, the blow-by gas treatment capability can be improved, and the increase in size of the engine 1 can be suppressed.
In the oil separator section 5 of the engine 1 according to the present embodiment, the inner wall surface portion 41a of the oil reservoir 41 is formed in an arc shape so that the inner wall surface portion 41a of the oil reservoir 41 follows the rotation locus of the camshaft 6, and therefore, the capacity of the oil reservoir 41 can be increased while avoiding an increase in size of the engine 1. Therefore, the separated and recovered oil can be stored in the oil reservoir 41 until the drain valve 43 is opened without being affected by the oil splashed by the rotation of the camshaft 6 in the head cover 3, and the oil can be prevented from being rewound into blow-by gas, and the oil can be smoothly discharged when the separated and recovered oil is discharged, so that the oil is less likely to remain in the oil reservoir 41.
In the oil separator section 5 of the engine 1 according to the present embodiment, the portion where the partition plate 4 is open (the upper portion of the oil reservoir 41) is closed by the lid member 44, and therefore, the oil temporarily collected in the oil reservoir 41 can be prevented from being splashed into the passage of the blow-by gas. That is, the liquid level L of the oil in the oil reservoir 41 is caused by vibration of the engine 1 or the likeOILThe oil may fluctuate, and in this case, the lid member 44 may also suppress the backflow of the oil. Therefore, in the present embodiment, more excellent oil separation and recovery can be achieved.
In the oil separator unit 5 of the engine 1 according to the present embodiment, the inner wall surface portion 41a of the oil reservoir 41 is formed in a concave-convex shape, so that fluctuation of the liquid level of the oil with respect to the drain valve 43 can be suppressed while ensuring the oil reservoir capacity.
In the oil separator section 5 of the engine 1 according to the present embodiment, since the uneven shape of the inner wall surface section 41a of the oil reservoir 41 is provided along the shaft body section 6a and the cam section 6b of the camshaft 6, respectively, interference with the camshaft 6 can be avoided, and a large-capacity oil reservoir 41 can be realized.
In the oil separator 5 of the engine 1 according to the present embodiment, the passage of the blow-by gas is partitioned into two chambers by the throttle wall 46, and the communication hole 46a is provided in the throttle wall 46. Therefore, the flow velocity of the blow-by gas flowing from the upstream side rises when passing through the communication hole 46a, and the oil separation when colliding with the cloth member 47 as the trapping member is promoted. Then, the oil trapped by the fabric member 47 is less likely to be drawn into the blow-by gas again, and more excellent oil separation and recovery can be achieved.
In the oil separator section 5 of the engine 1 according to the present embodiment, the passage of the blow-by gas between the two chambers is blocked except for the communication hole 46a, and therefore, the blow-by gas leakage at the throttle wall portion 46 can be eliminated. Therefore, the blow-by gas can be reliably passed through the communication hole 46a, and the oil mist having a small mist diameter can be reliably captured.
In the oil separator section 5 of the engine 1 according to the present embodiment, a portion in which the partition plate 4 is opened, that is, a portion in which the oil reservoir 41 is provided is disposed in a chamber on the downstream side in the flow direction of the blow-by gas. This is because the chamber on the downstream side may become negative pressure with respect to the crankcase during driving of the engine 1. That is, since the drain valve 43 is provided in the oil reservoir 41, the blowby gas containing oil mist can be prevented from flowing back to the intake system of the engine 1 through the oil reservoir 41 even while the chamber on the downstream side is under negative pressure with respect to the crankcase.
In the oil separator section 5 of the engine 1 according to the present embodiment, the fabric member 47 is formed using a nonwoven fabric, and therefore, the oil mist can be reliably captured while suppressing an increase in manufacturing cost. That is, since the catching member is made of a general material such as a nonwoven fabric, not a special material, an increase in manufacturing cost can be suppressed.
[ modified examples ]
As mentioned above, the inner wall surface portion of the oil reservoir container is not limited to the circular arc shape, and may be formed in a stepped shape.
In the above embodiment, the lid member 44 is a flat plate-shaped member, but the present invention is not limited thereto. For example, the member may have a mortar-like shape having a surface inclined toward the recovery hole.
In the above embodiment, the engine 1 in which the camshaft 6 and the camshaft 7 are provided on the intake side and the exhaust side, respectively, in the cylinder head 2 is employed, but the present invention is not limited thereto. For example, the above structure may also be employed in a so-called single cam type engine having one camshaft.
In the above embodiment, the oil separator portion 5 is provided with the oil capturing portion of the labyrinth structure including the separation wall portion 45 and the oil capturing portion of the inertial collision structure including the cloth member 47, but the present invention is not limited thereto. For example, the inertial collision structured oil capture portion may be provided in both the upstream side chamber and the downstream side chamber, and conversely, the labyrinth structured oil capture portion may be provided in both the upstream side chamber and the downstream side chamber.
In the above-described embodiment, the engine 1 is a multi-cylinder engine, but the present invention is not limited thereto. Single cylinder engines may also be employed. In this case, the same effects can be obtained by adopting the same oil separator structure as described above.
In the above embodiment, as the camshaft 6, the camshaft having the hollow structure is used for both the shaft portion 6a and the cam portion 6b, but the present invention is not limited thereto. Camshafts of solid construction may also be employed.
In the above embodiment, the inner wall surface portion 41a of the oil reservoir 41 is formed in a concave-convex shape in conformity with the shaft body portion 6a and the cam portion 6b of the camshaft 6, but the present invention is not limited to this. The inner wall surface portion may be formed without unevenness.
In the above embodiment, the upper portion of the oil reservoir 41 is opened and the opened portion is closed by the lid member 44, but the present invention is not limited to this. For example, the main body of the flat plate body may be provided with a recovery hole, and a bottomed cylindrical oil reservoir may be joined to the lower side thereof. Thus, even if the cover member is not provided, the oil in the oil storage container can be prevented from splashing to the channel of the blow-by gas.
[ conclusion ]
The oil separator structure of the engine is provided in a cylinder head of the engine, liquefies oil mist contained in blow-by gas so as to separate and recover oil, and includes a bowl-shaped head cover and a partition plate.
In the oil separator structure of the engine, the partition plate is a plate body that is provided so as to close a part of an opening in the head cover, and that forms a passage for the blow-by gas between the partition plate and the head cover.
In the oil separator structure of the engine, a part of the partition plate is open, and an oil reservoir for storing the separated and liquefied oil is provided on the opposite side of the cover in the part of the partition plate open.
In the oil separator structure of the engine, a wall surface portion of the oil reservoir is formed in a convex shape protruding into the head cover.
In the oil separator structure of the engine, a drain valve is provided in the oil reservoir at a bottom side portion of a side wall surface portion extending in a depth direction of the oil reservoir.
In the oil separator structure of the engine, a wall surface portion of the oil reservoir is formed in a convex shape protruding inward the head cover, and the drain valve is provided not on a bottom wall surface of the oil reservoir but on a bottom side portion of the wall surface portion. This makes it possible to increase the container depth of the oil storage container, increase the amount of oil that can be stored, and smoothly discharge the separated and recovered oil when the drain valve is in the open state.
Therefore, in the oil separator structure of the engine, the blow-by gas treatment capability can be improved, and the increase in size of the engine can be suppressed.
In the oil separator structure of the engine, the following structure may be adopted: a portion of a wall surface portion of the oil reservoir container along a rotation locus of the camshaft is formed in an arc shape when viewed from an axial direction of the camshaft disposed in the cylinder head.
In the oil separator structure for an engine according to the above configuration, since a part of the wall surface portion of the oil reservoir (a portion along the rotation path of the camshaft) is formed in an arc shape, the capacity of the oil reservoir can be increased while avoiding an increase in the size of the engine. Therefore, the separated and recovered oil can be temporarily stored in the oil reservoir before the drain valve is opened without being affected by the oil splashed by the rotation of the camshaft in the head cover, and the oil can be prevented from being re-entrained in the blow-by gas.
In the oil separator structure of the engine, the following structure may be adopted: the partition plate has an opening, which is partially blocked by a cover member, and the cover member is provided with a hole for communicating the channel of the blow-by gas with the inner space of the oil storage container.
In the oil separator structure for an engine according to the above configuration, since the portion formed by opening the partition plate is closed by the lid member, the oil temporarily collected in the container can be prevented from being splashed into the passage of the blow-by gas. That is, the liquid level of the oil in the container may fluctuate due to vibration of the engine or the like, and in this case, the lid member can suppress the backflow of the oil. Therefore, in the oil separator structure having the above-described structure, more excellent oil separation and recovery can be achieved.
In the oil separator structure of the engine, the following structure may be adopted: the oil reservoir is provided to extend in the extending direction of the camshaft, and a portion of a wall surface portion of the oil reservoir that is recessed in the radial direction of the camshaft and a portion that protrudes from the wall surface portion of the oil reservoir are formed into a continuous uneven shape in the extending direction of the camshaft.
In the oil separator structure for an engine according to the above configuration, since the wall surface portion of the oil reservoir has a concave-convex shape in a part thereof, the oil reservoir capacity can be secured, and the fluctuation of the liquid level of the oil with respect to the drain valve can be suppressed.
In the oil separator structure of the engine described above, the following structure may be adopted: the camshaft is formed by a small-diameter shaft portion and a large-diameter cam portion provided along an extending direction of the camshaft, and the concave-convex shape in a part of a wall surface portion of the oil reservoir is provided along the shaft portion and the cam portion in the camshaft, respectively.
In the oil separator structure for an engine configured as described above, since the uneven shape of the wall surface portion of the oil reservoir is provided along the shaft body portion and the cam portion of the camshaft, respectively, it is possible to realize an oil reservoir having a large capacity while avoiding the camshaft.
In the oil separator structure of the engine, the following structure may be adopted: the blow-by gas passage is partitioned into two chambers on the upstream side and the downstream side in the flow direction of the blow-by gas by a wall portion provided in at least one of the cover and the partition plate, a communication hole having a flow passage narrower than at least a flow passage cross-sectional area of the chamber on the upstream side is provided in the wall portion partitioning the two chambers, and a trap member facing an outlet of the communication hole with a gap is provided in the chamber on the downstream side.
In the oil separator structure for an engine configured as described above, the passage for blow-by gas is divided into two chambers by the wall portion, and the communication hole is provided in the wall portion. Therefore, the flow velocity of the blow-by gas increases when the blow-by gas passes through the communication hole, and separation of the oil when the blow-by gas collides with the trap member is promoted. Further, the oil trapped by the trapping member is less likely to be drawn into the blow-by gas again, and more excellent oil separation and recovery can be achieved.
In the oil separator structure of the engine, the following structure may be adopted: the passage of the blowby gas between the two chambers is blocked except for the communication hole provided in the wall portion.
In the oil separator structure of an engine employing the above-described structure, the passage of the blow-by gas between the two chambers is blocked except for the communication hole, and therefore, the blow-by gas leakage at the wall portion can be eliminated. Therefore, the blow-by gas can be reliably passed through the communication hole, and the oil mist having a small mist diameter can be reliably captured.
In the oil separator structure of the engine, the partition plate opening portion is disposed in the downstream chamber.
In the oil separator structure for an engine according to the above configuration, a portion formed by opening the partition plate, that is, a portion where the oil reservoir is provided is disposed in the chamber on the downstream side. This is because the chamber on the downstream side may be under-pressurized with respect to the crankcase during driving of the engine. That is, since the drain valve is provided in the oil reservoir, even when the chamber on the downstream side is under negative pressure with respect to the crankcase, the blow-by gas containing the oil mist can be prevented from flowing into the intake system of the engine through the oil reservoir.
In the oil separator structure of the engine, the following structure may be adopted: the catching member is formed by containing a nonwoven fabric.
In the oil separator structure of an engine having the above-described configuration, since the trapping member is formed by including the nonwoven fabric, it is possible to reliably trap the oil mist while suppressing an increase in manufacturing cost. That is, since the catching member is made of a general material such as a nonwoven fabric without using a special material, an increase in manufacturing cost can be suppressed.
As described above, in the oil separator structure of the engine, the blow-by gas treatment capability can be improved, and the increase in size of the engine can be suppressed.
Claims (7)
1. An oil separator structure of an engine, provided in a cylinder head of the engine, for liquefying oil mist contained in blow-by gas so as to separate and recover oil, characterized by comprising:
a bowl-shaped cover; and
a partition plate provided so as to close a part of an opening portion in the cover, the partition plate forming a passage of the blow-by gas between the partition plate and the cover,
a portion of the partition plate is opened,
an oil storage container for storing the separated and liquefied oil is provided on the opposite side of the cover in a portion where the partition plate is opened,
in the oil reservoir, a drain valve is provided on a side wall surface portion extending in a depth direction of the oil reservoir,
the wall surface portion of the oil reservoir container is formed in a convex shape protruding inward of the cover,
a portion of a wall surface portion of the oil reservoir container extending along a rotation locus of the camshaft at an interval is formed in an arc shape when viewed from an axial direction of the camshaft disposed in the cylinder head,
the oil reservoir is provided extending along the extending direction of the camshaft,
a part of a wall surface of the oil reservoir container is formed into a concave-convex shape that is continuous in an extending direction of the camshaft, the part being recessed in a radial direction of the camshaft and the part being protruded,
the drain valve is provided at a bottommost portion in the depth direction of the side wall surface of the oil reservoir container.
2. An oil separator structure of an engine according to claim 1, characterized in that:
the opening of the partition plate is partially blocked by a cover member,
the lid member is provided with a hole portion for communicating the blow-by gas passage with the internal space of the oil reservoir.
3. The oil separator structure of an engine according to claim 1 or 2, characterized in that:
the camshaft is formed by a small-diameter shaft body part and a large-diameter cam part which are arranged along the extension direction of the camshaft,
the concave-convex shape in a part of the wall surface portion of the oil reservoir is provided along the shaft portion and the cam portion in the camshaft, respectively.
4. The oil separator structure of an engine according to claim 1 or 2, characterized in that:
the channel of the blow-by gas is partitioned into two chambers on the upstream side and the downstream side in the flow direction of the blow-by gas by a wall portion provided to at least one of the cover and the partition plate,
a communication hole having a flow passage narrower than at least the flow passage cross-sectional area of the upstream chamber is provided in the wall portion partitioning the two chambers,
the chamber on the downstream side is provided with a catching member facing the outlet of the communication hole with a gap.
5. The oil separator structure of an engine according to claim 4, wherein:
the passage of the blowby gas between the two chambers is blocked except for the communication hole provided in the wall portion.
6. The oil separator structure of an engine according to claim 4, wherein:
the partition plate has an opening portion disposed in the downstream chamber.
7. The oil separator structure of an engine according to claim 4, wherein:
the catching member is formed by containing a nonwoven fabric.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-146613 | 2017-07-28 | ||
| JP2017146613A JP6935259B2 (en) | 2017-07-28 | 2017-07-28 | Engine oil separator structure |
| PCT/JP2018/027138 WO2019021939A1 (en) | 2017-07-28 | 2018-07-19 | Oil separator structure for engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110945217A CN110945217A (en) | 2020-03-31 |
| CN110945217B true CN110945217B (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880048433.0A Active CN110945217B (en) | 2017-07-28 | 2018-07-19 | Oil separator structure of engine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6935259B2 (en) |
| CN (1) | CN110945217B (en) |
| DE (1) | DE112018003854B4 (en) |
| WO (1) | WO2019021939A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112128011B (en) * | 2020-09-16 | 2022-01-28 | 安徽江淮汽车集团股份有限公司 | Engine cylinder cover shield |
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| CN102297002A (en) * | 2010-06-24 | 2011-12-28 | 马自达汽车株式会社 | Oil separation device of engine |
| CN203559960U (en) * | 2012-10-31 | 2014-04-23 | 丰田纺织株式会社 | Oil mist separator |
| JP2015158132A (en) * | 2012-06-01 | 2015-09-03 | 株式会社マーレ フィルターシステムズ | Internal combustion engine oil separator |
| CN105715326A (en) * | 2014-12-18 | 2016-06-29 | 株式会社马勒滤清系统 | Oil Mist Separator |
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| JP6136725B2 (en) * | 2013-08-01 | 2017-05-31 | トヨタ紡織株式会社 | Oil mist separator |
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| JPS5985313U (en) * | 1982-11-30 | 1984-06-09 | スズキ株式会社 | cylinder head of internal combustion engine |
| JPS6117113U (en) * | 1984-07-04 | 1986-01-31 | トヨタ自動車株式会社 | Gas-liquid separation device for internal combustion engine blow-by gas reduction device |
| JPH11264312A (en) | 1997-10-20 | 1999-09-28 | Nippon Soken Inc | Vapor-liquid separation device |
| JP2009121281A (en) | 2007-11-13 | 2009-06-04 | Mahle Filter Systems Japan Corp | Oil separator for internal combustion engine |
| DE102010062321B4 (en) * | 2010-12-02 | 2023-10-12 | Elringklinger Ag | Oil separator unit |
| JP5994362B2 (en) * | 2012-04-27 | 2016-09-21 | トヨタ自動車株式会社 | Engine oil separator |
| JP2016133132A (en) * | 2015-01-15 | 2016-07-25 | トヨタ紡織株式会社 | Check valve and check valve structure |
| JP6469565B2 (en) * | 2015-12-29 | 2019-02-13 | 株式会社クボタ | engine |
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2017
- 2017-07-28 JP JP2017146613A patent/JP6935259B2/en active Active
-
2018
- 2018-07-19 CN CN201880048433.0A patent/CN110945217B/en active Active
- 2018-07-19 DE DE112018003854.8T patent/DE112018003854B4/en active Active
- 2018-07-19 WO PCT/JP2018/027138 patent/WO2019021939A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297002A (en) * | 2010-06-24 | 2011-12-28 | 马自达汽车株式会社 | Oil separation device of engine |
| JP2015158132A (en) * | 2012-06-01 | 2015-09-03 | 株式会社マーレ フィルターシステムズ | Internal combustion engine oil separator |
| CN203559960U (en) * | 2012-10-31 | 2014-04-23 | 丰田纺织株式会社 | Oil mist separator |
| JP6136725B2 (en) * | 2013-08-01 | 2017-05-31 | トヨタ紡織株式会社 | Oil mist separator |
| CN105715326A (en) * | 2014-12-18 | 2016-06-29 | 株式会社马勒滤清系统 | Oil Mist Separator |
| CN106246286A (en) * | 2015-06-11 | 2016-12-21 | 株式会社久保田 | Electromotor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112018003854T5 (en) | 2020-04-16 |
| CN110945217A (en) | 2020-03-31 |
| JP2019027342A (en) | 2019-02-21 |
| JP6935259B2 (en) | 2021-09-15 |
| WO2019021939A1 (en) | 2019-01-31 |
| DE112018003854B4 (en) | 2023-02-16 |
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