JP2018091286A - Cylinder head cover and engine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the oil separation efficiency and to strengthen the prevention of re-mixing of mist-like oil into a gas according to an embodiment of the present invention. SOLUTION: A step portion 15 projecting inward of the flow path 13 is provided at the bottom of a flow path 13 of an oil separator 10 provided integrally with a cylinder head cover 2, and an upper step portion of the step portion 15 is provided. A filter 14 is arranged on the 15a, and the flow of the gas flowing into the flow path 13 from the gas inflow port 11 is directed upward (arrow X) with respect to the vertical direction toward the filter 14, and the stepped portion 15 of the gas. By passing the filter 14 after decelerating the flow, the oil separation efficiency can be improved, and the flow of the gas passing through the filter 14 is decelerated to be collected by the filter 14 after separation. It is possible to strengthen the prevention of re-mixing of mist-like oil into the gas after passing through the filter 14. [Selection diagram] Fig. 3

Description

  The present disclosure relates to a cylinder head cover that covers an upper surface of a cylinder head mounted on a vehicle and an engine including the same.

  As an engine mounted on a vehicle such as an automobile, an engine having an oil separator integrally formed in a cylinder head cover disposed on the cylinder head is known (for example, see Patent Document 1).

  This oil separator separates the mist-like oil from the blow-by gas containing the mist-like oil from the engine, and is provided in the flow path of the blow-by gas formed in the cylinder head cover as a housing and the flow path. And a filter. In addition, a separation surface is erected in the flow path downstream from the filter in a direction perpendicular to the flow of blow-by gas, and a gap is formed between one end edge of the separation surface and the upper wall of the flow path. Is provided.

  Further, a gas inlet communicating with the crank chamber of the engine is formed on one side upstream from the filter in the bottom wall that is the bottom of the flow path, and the top wall that is the top of the flow path. A gas outlet that communicates with the intake passage of the engine is formed on the other side downstream of the filter (more specifically, the separation surface). In addition, an oil discharge port is formed on the bottom wall of the flow channel so as to protrude downstream from the filter and upstream from the separation surface.

  In the oil separator configured as described above, blow-by gas from the engine flows into the flow path from the gas inlet, and mist-like oil is separated from the blow-by gas through the filter and discharged from the gas outlet. At the same time, the separated mist-like oil is collected from the oil discharge port to the inside of the cylinder head cover and used for lubricating the movable part of the camshaft.

  At this time, since the separation surface is provided in the flow path, the blow-by gas after the mist-like oil is separated flows to the gas outlet through the gap between the separation surface and the upper wall of the flow path. The separated mist-like oil is guided to the oil discharge port because the separation surface blocks the progress to the gas outlet. Thereby, it is possible to prevent the separation efficiency from being lowered without the mist-like oil after separation being mixed into the blow-by gas again.

JP 2010-248935 A

  However, in the oil separator of Patent Document 1, it is considered that the flow path from the gas inlet to the filter is substantially flat, and the flow (flow velocity) of blow-by gas to the filter is constant. Therefore, when the flow rate of blow-by gas is high, there is a possibility that the mist-like oil may flow out to the intake passage of the engine without being sufficiently collected by the filter.

  In addition, when the flow of blow-by gas to the filter is fast, the mist-like oil that has been collected and dropped by the filter is rolled up by the blow-by gas passing through the filter and mixed again into the blow-by gas after passing through the filter. There was also a risk of it. Therefore, there is still room for improvement in order to prevent re-mixing of mist-like oil into blow-by gas and to improve the oil collecting efficiency (that is, oil separation efficiency) in the filter.

  That is, by reducing the flow rate of blow-by gas with respect to the filter, it is possible to improve oil collection efficiency (oil separation efficiency) in the filter and to enhance prevention of remixing of mist-like oil into the blow-by gas. Development of a cylinder head cover provided with an oil separator and an engine using the same are expected.

  Therefore, the present invention has been made in view of the above-described circumstances, and at least one embodiment of the present invention aims to improve oil separation efficiency and enhance prevention of remixing of mist oil into gas. And

(1) A cylinder head cover according to at least one embodiment of the present invention is a cylinder head cover provided with an oil separator that is disposed in an upper part of an engine and separates the mist oil from a gas containing mist oil.
The oil separator includes a gas inlet through which the gas flows in, a gas outlet through which the gas flows out, a flow path through which the gas flows, the gas inlet and the gas outlet, A filter provided in the flow path and collecting the mist-like oil contained in the gas,
A step portion protruding toward the inside of the flow channel is provided at the bottom of the flow channel, and the filter is disposed on an upper step portion of the step portion.

  According to the configuration of (1), the bottom of the flow path of the oil separator is provided with a stepped portion projecting inward of the flow path, and the filter is disposed on the upper step of the stepped portion. Therefore, the flow of gas containing mist-like oil (for example, blow-by gas) that has flowed into the flow path from the gas inlet can be directed upward with respect to the vertical direction toward the filter (the cylinder head cover is in the horizontal direction). If installed). Therefore, the gas flow rate can be reduced as compared with the case where no step portion is provided at the bottom of the flow path, and the oil flow in the filter is reduced by passing the filter after the gas flow is decelerated by the step portion. The collection efficiency (that is, oil separation efficiency) can be improved.

Further, since the flow of gas passing through the filter can be decelerated, the separated mist-like oil collected and dropped by the filter is not rolled up by the gas passing through the filter, and is converted to the gas after passing through the filter. It is possible to strengthen the prevention of remixing of mist oil.
Thus, it is possible to realize a cylinder head cover that can improve the oil separation efficiency and enhance the prevention of the re-mixing of the mist-like oil into the gas.

  (2) In some embodiments, in the configuration of (1), an inclined portion that is inclined toward the engine side toward the outside of the flow path is formed at the bottom of the flow path on the upstream side of the stepped portion. It is further provided.

  According to the configuration of (2) above, the bottom of the flow path upstream from the stepped portion is provided with the inclined portion that is inclined toward the engine side toward the outside of the flow path. Can be directed downward with respect to the direction (when the cylinder head cover is installed horizontally). Therefore, the gas flow can be adjusted (decelerated) by the difference in height of the bottom of the flow path from the gas inlet to the filter, and the gas flow rate with respect to the filter can be further reduced. Therefore, it is possible to further enhance the oil collection efficiency (that is, oil separation efficiency) in the filter and the prevention of re-mixing of mist oil into the gas after passing through the filter.

  (3) In some embodiments, in the configuration of (2), an oil discharge port for discharging oil is provided at the tip of the inclined portion of the inclined portion.

  According to the configuration (3), since the oil discharge port for discharging oil is provided at the tip of the inclined portion of the inclined portion, the oil can be efficiently discharged to the engine side.

  (4) In some embodiments, in the configuration of any one of (1) to (3), a large number of the top portions of the flow paths upstream from the filter are arranged along the gas flow direction. A labyrinth portion having adjacent protrusions is provided.

  According to the configuration of (4) above, the labyrinth portion having a large number of adjacent protrusions along the flow direction of the gas containing the mist-like oil is provided on the top of the flow path upstream of the filter. Therefore, the mist-like oil contained in the gas can be collected in advance (that is, at a stage before passing through the filter) in advance. That is, the labyrinth portion can function as a preprocessing filter. Thereby, clogging of the filter by mist-like oil with a large particle size can be suppressed. Further, in the filter, since it is possible to specialize in collecting the mist-like oil having a small particle size from the gas after the mist-like oil having a large particle size is removed, the oil separation efficiency can be further improved.

  (5) In some embodiments, in any one of the configurations (1) to (4), the flow path has a volume downstream of the filter larger than a volume upstream of the filter. Features.

  According to the configuration of (5), since the volume of the flow path on the downstream side of the filter is larger than the volume of the flow path on the upstream side of the filter, the flow of gas passing through the filter can be further reduced. Therefore, it is possible to further enhance the oil collection efficiency (that is, oil separation efficiency) in the filter and the prevention of re-mixing of mist oil into the gas after passing through the filter.

(6) In some embodiments, in any one of the configurations (1) to (5), the oil discharge port protrudes outward from the flow path at the bottom of the flow path. And
A first outlet provided upstream of the filter;
A second outlet provided on the downstream side of the filter,
The second discharge port is characterized in that a protruding amount outward is larger than that of the first discharge port.

  According to the configuration of (6), the second outlet provided on the downstream side of the filter among the first outlet and the second outlet as the oil outlet is provided on the upstream side of the filter. The amount of outward projection of the flow path is formed larger from one discharge port (that is, it extends longer toward the lower side of the cylinder head cover). Therefore, at the second outlet, more mist-like oil collected by the filter can be recovered, and the collected mist-like oil can be more strongly prevented from being mixed again into the gas. .

  Further, the volume of the flow path downstream of the filter is increased by the amount of projection below the second discharge port from the first discharge port, and the flow of gas passing through the filter can be further reduced. it can. Therefore, it is possible to further enhance the oil collection efficiency (that is, oil separation efficiency) in the filter and the prevention of re-mixing of mist oil into the gas after passing through the filter.

  In addition, since the filter is disposed on the upper part of the stepped part protruding inward of the flow path and the second discharge port is provided on the downstream side thereof, the second exhaust having a large protruding amount is obtained by being raised by the stepped part. The exit can be easily formed.

  (7) An engine according to at least one embodiment of the present invention includes a cylinder head cover having any one of the configurations (1) to (6).

According to the configuration of (7), the bottom of the flow path of the oil separator provided integrally with the cylinder head cover is provided with the stepped portion projecting inward of the flow path. Since the filter is disposed in the upper stage portion, the flow of gas (for example, bouby gas) flowing into the flow path from the gas inlet can be directed upward in the vertical direction toward the filter. Therefore, the gas flow rate can be reduced as compared with the case where no step portion is provided at the bottom of the flow path, and the oil flow in the filter is reduced by passing the filter after the gas flow is decelerated by the step portion. The collection efficiency (that is, oil separation efficiency) can be improved. Further, since the flow of gas passing through the filter can be decelerated, the separated mist-like oil collected and dropped by the filter is not rolled up by the gas passing through the filter, and is converted to the gas after passing through the filter. It is possible to strengthen the prevention of remixing of mist oil.
Therefore, it is possible to realize an engine including a cylinder head cover that can improve the oil separation efficiency and enhance the prevention of re-mixing of mist-like oil into the gas.
Moreover, the effect by the structure in any one of said (2)-(6) can be show | played.

  According to at least one embodiment of the present invention, it is possible to improve oil separation efficiency and enhance prevention of re-mixing of mist oil into gas.

It is a perspective view showing an important section of an engine concerning one embodiment of the present invention. It is a top view which shows the cylinder head cover of FIG. 1 seeing from upper direction. It is sectional drawing which shows the cross section of the AA arrow in FIG. 1 and FIG.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. It should be noted that the shapes of the component parts described in the following embodiments and the relative arrangement thereof are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Absent.

FIG. 1 is a perspective view schematically showing a cylinder head cover 2 which is a main part of an engine 1 according to an embodiment of the present invention. FIG. 2 is a plan view showing the cylinder head cover of FIG. FIG. 3 is a cross-sectional view showing a cross section taken along arrows AA in FIGS. 1 and 2.
As shown in FIGS. 1 and 2, the engine 1 of this embodiment is mounted on a vehicle such as an automobile not shown, and includes a cylinder head cover 2, a cylinder head (not shown), a cylinder block (not shown), a crankcase ( (Not shown). A plurality of cylinders (not shown) are formed by a cylinder head and a plurality of cylinders (not shown) of the cylinder block.

  Furthermore, each cylinder accommodates a piston (not shown), and a crankshaft in the crankcase is connected to each piston via a connecting rod (not shown). Further, an oil pan (not shown) is provided at the lower part of the crankcase, and contains engine oil for lubrication and cooling. The cylinder head cover 2, the cylinder head, the cylinder block, the crankcase, the crankshaft, the connecting rod, and the oil pan constitute an engine body of the engine 1. A known valve mechanism is housed inside the cylinder head, and a cylinder head cover 2 is disposed on the upper part of the cylinder head. A fuel injection device (injector 3) is assembled to the cylinder head cover 2 through the opening 4.

  In the present embodiment, the case where the engine 1 is an in-line four-cylinder engine is illustrated and described. However, the present invention is not limited to this, and various other engines can of course be applied. Further, the engine 1 is configured in substantially the same manner as a general engine except for a configuration of an oil separator 10 which will be described later provided integrally with the cylinder head cover 2 and a shape change in the cylinder head cover 2 associated therewith. Then, detailed description shall be omitted.

  Specifically, as shown in FIG. 3, the cylinder head cover 2 used in the engine 1 is integrally provided with an oil separator 10 on the inner side located on the cylinder head side. The oil separator 10 separates the mist-like oil from the blow-by gas containing the mist-like oil, and includes a gas inlet 11 into which blow-by gas flows, a gas outlet 12 from which blow-by gas flows out, a gas flow And a flow path 13 through which blow-by gas circulates between the inlet 11 and the gas outlet 12. The oil separator 10 is provided in the flow path 13 and collects the mist-like oil contained in the blow-by gas. The oil separator 10 is provided in the flow path 13 and discharges the mist-like oil separated from the blow-by gas. And outlets 16 and 17.

  In the case of the present embodiment, a step portion 15 that protrudes inward of the flow path 13 is provided at the bottom 13 a of the flow path 13 in the oil separator 10, and the filter 14 is an upper stage of the step section 15. It is arranged in the part 15a. As a result, when the cylinder head cover 2 is arranged in a horizontal state, the blow-by gas flow that has flowed into the flow path 13 from the gas inlet 11 is directed upward toward the filter 14 in the vertical direction (to the filter 14 indicated by the arrow X). In the direction of inclining upward).

  Further, the top step portion 25 is also formed in the top portion 13 b of the flow path 13 corresponding to the portion of the step portion 15 formed in the bottom portion 13 a of the flow path 13. The top portion 13b bulged upward by the top step portion 25 and having a high height is extended in the longitudinal direction of the cylinder head cover 2 to form a bulge portion 26.

  Further, when the inclined portion 18 that is inclined toward the engine side toward the outside of the flow path 13, that is, the cylinder head cover 2, is disposed in a horizontal state at the bottom portion 13 a upstream of the step portion 15 in the flow path 13. It is preferable that an inclined portion 18 that directs the flow of blow-by gas downward (arrow Y) with respect to the vertical direction is provided.

The inclined portion 18 is provided in the vicinity of the oil discharge port (specifically, a first discharge port 16 to be described later), and is inclined downward from the gas inlet 11 side toward the first discharge port 16. Thereby, the flow of blow-by gas can be adjusted (decelerated) by the height difference of the bottom portion 13 a of the flow path 13 from the gas inlet 11 to the filter 14. In addition, the inclination part 18 is formed in the shape of a mortar, and the 1st discharge port 16 is formed in the lowest site | part.

  Moreover, it is preferable that the labyrinth part 19 which has many adjacent protrusions along the flow direction of blow-by gas is provided in the top part upstream from the filter 14 in the flow path 13. This makes it possible to collect in advance the mist-like oil contained in the blow-by gas having a large particle size (that is, at a stage before passing through the filter 14), so that the labyrinth portion 19 is moved forward. It becomes possible to function as a filter for processing.

  Furthermore, the flow path 13 preferably has a volume downstream from the filter 14 larger than a volume upstream from the filter 14. Thereby, the flow of blow-by gas passing through the filter 14 can be further reduced.

  Further, the oil discharge port protrudes from the bottom 13a of the flow channel 13 toward the outside of the flow channel 13, and the first discharge port 16 provided on the upstream side of the filter 14 and the downstream side of the filter. The second discharge port 17 is provided with a larger amount of outward projection than the first discharge port 16 (in other words, the cylinder head below the cylinder head cover 2). It is preferable to extend long toward the side). Thereby, more mist-like oil collected by the filter 14 can be collected at the second discharge port 17. Further, the volume of the flow path 13 on the downstream side of the filter 14 is increased by the amount by which the second discharge port 17 protrudes below the first discharge port 16, so that the flow of blow-by gas passing through the filter 14 is reduced. This can be further reduced.

  As described above, according to the engine 1 using the cylinder head cover 2 of the present embodiment, the bottom portion 13a of the flow path 13 of the oil separator 10 provided integrally with the cylinder head cover 2 has an inner portion of the flow path 13 therein. A step portion 15 projecting in the direction is provided, and the filter 14 is disposed on the upper step portion 15 a of the step portion 15. For this reason, the flow of blow-by gas flowing into the flow path 13 from the gas inlet 11 can be directed upward (arrow X) with respect to the vertical direction toward the filter 14. Therefore, the flow velocity of blow-by gas can be reduced compared with the case where the step portion 15 is not provided at the bottom portion 13a of the flow path 13, and the flow of the blow-by gas is decelerated by the step portion 15 and then passed through the filter 14. Thus, the oil collection efficiency (that is, oil separation efficiency) in the filter 14 can be improved.

Further, since the flow of blow-by gas passing through the filter 14 can be decelerated, the separated mist-like oil collected and dropped by the filter 14 is not wound up by the blow-by gas passing through the filter 14. The prevention of re-mixing of mist-like oil into the blow-by gas after 14 passes can be enhanced.
Therefore, it is possible to realize the cylinder head cover 2 and the engine 1 using the cylinder head cover 2 that can improve the oil separation efficiency and can enhance the prevention of the re-mixing of the mist-like oil into the blow-by gas.

  At this time, an inclined portion 18 that directs the flow of blow-by gas downward (arrow Y) with respect to the vertical direction is further provided at the bottom 13 a of the flow path 13 upstream from the stepped portion 15. The flow of blow-by gas can be adjusted (decelerated) by the height difference of the bottom portion 13a of the flow path 13, and the flow rate of blow-by gas with respect to the filter 14 can be further reduced. Therefore, the oil collection efficiency (that is, oil separation efficiency) in the filter 14 can be further improved, and the prevention of re-mixing of mist-like oil into the blow-by gas after passing through the filter 14 can be further enhanced.

  Further, by providing a labyrinth portion 19 having a large number of adjacent protrusions along the direction in which the blowby gas flows in the top portion upstream of the filter 14 in the flow path 13, of the mist-like oil contained in the blowby gas Those having a large particle diameter can be collected in advance (that is, at a stage before passing through the filter 14). That is, the labyrinth unit 19 can function as a preprocessing filter. Thereby, clogging of the filter 14 by mist-like oil with a large particle size can be suppressed. Further, the filter 14 can specialize in collecting the mist-like oil having a small particle diameter from the blow-by gas after the mist-like oil having a large particle diameter has been removed, so that the oil separation efficiency can be further improved. it can.

  Furthermore, by making the volume of the flow path 13 downstream from the filter 14 larger than the volume of the flow path 13 upstream from the filter 14, the flow of blow-by gas passing through the filter 14 can be further reduced. Therefore, the oil collection efficiency (that is, oil separation efficiency) in the filter 14 can be further improved, and the prevention of re-mixing of mist-like oil into the blow-by gas after passing through the filter 14 can be further enhanced.

  Further, the oil discharge port includes a first discharge port 16 provided on the upstream side of the filter 14 and a second discharge port 17 provided on the downstream side of the filter 14, and the second discharge port 17 is provided with the first discharge port. 16, it is preferable that the outward projecting amount of the flow path 13 is formed to be large (that is, it extends longer toward the lower side of the cylinder head cover 2). Thereby, at the 2nd discharge port 17, more mist-like oil collected by the filter 14 can be collect | recovered more, and it is prevented more strongly that the mist-like oil after collection is mixed again into blow-by gas. can do. Further, the volume of the flow path 13 on the downstream side of the filter 14 is increased by the amount by which the second discharge port 17 protrudes below the first discharge port 16, so that the flow of blow-by gas passing through the filter 14 is reduced. This can be further reduced. Therefore, the oil collection efficiency (that is, oil separation efficiency) in the filter 14 can be further improved, and the prevention of re-mixing of mist-like oil into the blow-by gas after passing through the filter 14 can be further enhanced.

  According to one embodiment of the present invention, the step portion 15 is provided in the bottom portion 13 a of the flow path 13, and the filter 14 is installed in the upper step portion 15 a of the step portion 15 to reduce the flow rate of blow-by gas with respect to the filter 14. As a result, the oil collection efficiency (oil separation efficiency) in the filter 14 can be improved and the prevention of re-mixing of the mist-like oil into the blow-by gas can be enhanced, so that vehicles such as automobiles, ships, trains, etc. Suitable for use in engines mounted on vehicles and cylinder head covers equipped on them.

DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder head cover 10 Oil separator 11 Gas inlet 12 Gas outlet 13 Channel 13a Bottom of channel 13b Top of channel 14 Filter 15 Step part 15a Upper stage 16 First outlet (oil outlet)
17 Second outlet (oil outlet)
18 Inclined portion 19 Labyrinth portion 25 Top step portion 26 Swelling portion

Claims (7)

A cylinder head cover provided with an oil separator that is disposed at the top of the engine and separates the mist oil from a gas containing the mist oil,
The oil separator is
A gas inlet into which the gas flows;
A gas outlet through which the gas flows;
A flow path through which the gas flows, communicating between the gas inlet and the gas outlet;
A filter provided in the flow path for collecting the mist oil contained in the gas;
With
At the bottom of the flow path, a stepped portion protruding toward the inside of the flow path is provided,
The cylinder head cover, wherein the filter is disposed in an upper stage part of the step part.   2. The cylinder head cover according to claim 1, wherein an inclined portion that is inclined toward the engine side toward the outside of the flow path is further provided at a bottom portion on the upstream side of the stepped portion in the flow path. .   The cylinder head cover according to claim 2, wherein an oil discharge port for discharging oil is provided at a tip of the inclined portion of the inclined portion.   The labyrinth part which has many adjacent protrusions along the direction through which the said gas flows is provided in the top part upstream from the said filter in the said flow path. The cylinder head cover according to one item.   The cylinder head cover according to any one of claims 1 to 4, wherein the flow path has a volume downstream from the filter larger than a volume upstream from the filter. The oil discharge port protrudes outward from the flow path at the bottom of the flow path,
A first outlet provided upstream of the filter;
A second outlet provided on the downstream side of the filter,
The cylinder head cover according to any one of claims 1 to 5, wherein the second discharge port is formed to have a larger protruding amount outward than the first discharge port. An engine comprising the cylinder head cover according to any one of claims 1 to 6.

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