JP2020033880A - Cover internal oil separator device - Google Patents

Abstract

To provide a cover internal oil separator device which inhibits occurrence of oil caulking in an intake passage.SOLUTION: A cover internal oil separator device includes: a baffle chamber 34 enclosed by a chamber wall 33 forming an endless annular shape in an internal space of a cylinder head cover 11c; an inlet 35 communicating with a crank chamber 11d; and an outlet 36 communicating with an intake passage 12. An interior of the baffle chamber 34 includes an enclosure wall 37 which encloses a peripheral edge part of the inlet 35 in a state where a part at a side from the outlet 36 to the inlet 35 of the peripheral edge part of the inlet 35 opens.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to an oil separator device in a cover, and more particularly, to an oil separator device in a cover that suppresses occurrence of oil coking in an intake passage.

  In an oil separator device in a cover in which a baffle chamber is formed in an internal space of a cylinder head cover, a device in which a drain hole for dropping oil separated from blow-by gas is provided at an intermediate position between an inlet and an outlet of the blow-by gas has been proposed. (For example, see Patent Document 1).

JP-A-2000-045749

  By the way, the device described in Patent Document 1 has a structure in which oil is dropped from a drain hole formed near the outlet, but blow-by gas inside the device is sucked up from the outlet by a negative pressure of the intake system. Therefore, when a large amount of oil exists near the outlet, the oil may flow out of the outlet due to the negative pressure.

  As described above, when the oil flows out of the outlet of the oil separator loaded in the cover, the content of the oil contained in the blow-by gas joined to the intake air increases, which causes oil caulking in the intake passage.

  An object of the present disclosure is to provide an oil separator device in a cover that suppresses generation of oil coking in an intake passage.

  To achieve the above object, an oil separator device in a cover according to an aspect of the present invention includes a baffle chamber formed in an internal space of a cylinder head cover of an engine, and an inlet formed in the baffle chamber and communicating with a crank chamber of the engine. And an outlet formed in the baffle chamber and communicating with an intake passage of the engine, wherein the inlet and the outlet are arranged in one direction in the baffle chamber and are separated from each other in an oil separator device in a cover. The baffle chamber is provided with an enclosing wall that surrounds a peripheral portion of the entrance in a state where a part of the side from the exit toward the entrance in the one direction is open.

  According to one embodiment of the present invention, the generation of oil coking in the intake passage can be suppressed by reducing the oil flowing toward the vicinity of the outlet.

It is a lineblock diagram which illustrates an embodiment of an oil separator device in a cover. FIG. 2 is a perspective view illustrating the cylinder head cover of FIG. 1. FIG. 3 is a cross-sectional view illustrating a cross section in the XY plane of the oil separator device in a cover of FIG. FIG. 3 is a cross-sectional view illustrating a cross section in the YZ plane of the in-cover oil separator device of FIG.

  Hereinafter, an embodiment of an oil separator device in a cover will be described. In the figure, the X direction is the direction in which the entrance 35 and the exit 36 in the baffle chamber 34 are separated (one direction), the Z direction is the direction in which the chamber wall 33 and the surrounding wall 37 are erected, and the Y direction is the X direction and the Z direction. And the direction orthogonal to.

  As illustrated in FIG. 1, the in-cover oil separator device 30 is a part of the blow-by gas recirculation device 20 mounted on the engine 10, is formed in an internal space of the cylinder head cover 11 c of the engine 10, and This is a device for separating the oil L1 contained in the oil.

  The engine 10 includes an engine body 11 including a cylinder block 11a, a cylinder head 11b, and a cylinder head cover 11c, an intake passage 12, an exhaust passage 13, a turbocharger 14, and a blow-by gas recirculation device 20. .

  The cylinder block 11a has a cylinder (cylinder) 15, a piston 16, and a crankshaft 17 inside, and a crank chamber 11d is formed at a lower end. The cylinder head 11b is joined to an upper end of the cylinder block 11a to form a combustion chamber, and has an injector 18 and a valve mechanism 19 as a driving body. The valve operating mechanism 19 includes a supply / exhaust valve 19a, a rocker arm 19b, a rocker arm shaft 19c, a cam 19d, and a cam shaft 19e. The turbocharger 14 has a compressor 14 a arranged in the intake passage 12 and a turbine 14 b arranged in the exhaust passage 13.

  The blow-by gas recirculation device 20 includes an oil separator device 21 outside the cover, a gas recirculation passage 22, an oil recirculation passage 23, a recirculation valve 24, and an oil separator device 30 inside the cover.

  The oil separator device 21 outside the cover is a device that separates the oil L1 contained in the blow-by gas G1 after passing through the oil separator device 30 inside the cover. As a separation method of the oil separator device 21 outside the cover, a filtration method or a centrifugal separation method is exemplified. In addition, as the blow-by gas recirculation device 20, a device without the oil separator device 21 outside the cover is also exemplified.

  The gas recirculation passage 22 is a passage for recirculating the blow-by gas G1 from which the oil L1 has been separated to the intake passage 12. The blow-by gas recirculation device 20 is a device that recirculates the blow-by gas G1 using negative pressure in the intake passage 12. That is, the gas recirculation passage 22 can be connected as long as a negative pressure is generated in the intake passage 12.

  In the engine 10 equipped with the turbocharger 14 as in this embodiment, the gas recirculation passage 22 is preferably connected upstream of the compressor 14a. When the gas recirculation passage 22 is connected to a portion downstream of the compressor 14a, the blow-by gas G1 does not recirculate when the supercharging pressure by the compressor 14a is high. Further, the blow-by gas G1 that has not been supercharged through the gas recirculation passage 22 is recirculated to the intake passage 12, and the supercharging pressure may be reduced accordingly. As in this embodiment, in the engine 10 equipped with the turbocharger 14, the gas recirculation passage 22 is connected to a portion upstream of the compressor 14a, so that the negative pressure at a portion upstream of the compressor 14a It is possible to recirculate the blow-by gas G1 to the intake passage 12. Further, the blow-by gas G1 recirculated to the intake passage 12 can be supercharged by the compressor 14a, which is advantageous for avoiding a decrease in supercharging pressure.

  The oil return passage 23 is a passage for returning the separated oil L1 to the crank chamber 11d of the cylinder block 11a. The oil recirculation passage 23 only needs to be capable of recirculating the separated oil L1 to the crank chamber 11d.

  The recirculation valve 24 is a valve for adjusting the recirculation amount of the blow-by gas G1 from which the oil L1 has been separated.

  As illustrated in FIGS. 2 to 4, the oil separator device 30 in the cover is an inertial collision type oil separator device installed in the internal space of the cylinder head cover 11c. The oil separator device 30 in the cover includes a baffle chamber 34 surrounded by a ceiling 31, a floor 32, and a chamber wall 33 of the internal space of the cylinder head cover 11c, an inlet 35, an outlet 36, a surrounding wall 37, and a recess 38. And drain holes 39a and 39b.

  The engine 10 is mounted on the vehicle in a state where the rear is inclined downward in the Z direction as compared with the front in the X direction. Accordingly, the floor 32 in the internal space of the cylinder head cover 11c is inclined downward in the Z direction from the inlet 35 toward the outlet 36 in the X direction. The floor 32 is inclined downward in the Z direction from one side to the other side in the Y direction. That is, in other words, in FIG. 3, in the floor 32, in the diagonal direction from the upper left corner to the lower right corner, the lower right corner is inclined downward in the Z direction. As the floor 32 is inclined toward the corner in this manner, the oil L1 separated in the baffle chamber 34 is collected at a specific portion.

  The room wall 33 is a wall that stands in the Z direction, which is the standing direction from the ceiling 31 to the floor 32, and forms an endless ring when viewed in the Z direction. The chamber wall 33 may be formed such that the flow path of the blow-by gas G1 is a single path without branching when viewed in the Z direction, and the flow path is a meandering flow path or a labyrinth flow path. May be done. The chamber wall 33 of this embodiment has a shape in which the area in the ring on the side where the inlet 35 is formed is larger than the area in the ring on the side where the outlet 36 is formed, as viewed in the Z direction. .

  The baffle chamber 34 is a space surrounded by the ceiling 31, the floor 32, and the chamber wall 33 of the cylinder head cover 11c. The baffle chamber 34 performs gas-liquid separation by causing the blow-by gas G <b> 1 sucked by the negative pressure in the intake passage 12 to collide with the chamber wall 33 and the surrounding wall 37. The baffle chamber 34 has, as viewed in the Z direction, an inlet portion 34a in which the flow path of the blow-by gas G1 is spiral on the side where the inlet 35 is formed, and a flow path of the blow-by gas G1 on the side where the outlet 36 is formed. And an outlet portion 34b extending in the X direction. Note that a baffle plate against which the blow-by gas G1 can collide may be provided in the baffle chamber 34 at an intermediate position of the flow path of the blow-by gas G1.

  The inlet 35 is formed on the floor 32 of the baffle chamber 34 and communicates with the crank chamber 11d of the engine 10 via the cylinder head 11b. The inlet 35 has a duct portion 35a having both ends open, one end of the duct portion 35a opens to the floor 32, and the other end opens toward the inside of the cylinder head 11b. As described above, the duct portion 35a is opened at one end in the X direction, curved at an intermediate position, and opened at the other end in the Y direction, so that the oil L1 is separated from the blow-by gas G1 at the inlet 35. Is advantageous.

  The outlet 36 is formed on the ceiling 31 of the baffle chamber 34 and communicates with the intake passage 12 of the engine 10 via the oil separator device 21 outside the cover and the gas recirculation passage 22. The outlet 36 is connected to the lower end of the oil separator device 21 outside the cover.

  The surrounding wall 37 is erected in the Z direction similarly to the room wall 33, and viewed in the Z direction, has a channel shape (a channel steel shape), a U shape (a horseshoe shape), and a C shape (a half pipe shape). The wall is a wall that surrounds the periphery of the entrance 35 inside the baffle chamber 34. In the present disclosure, the peripheral portion of the entrance 35 indicates a portion of the periphery of the opening formed in the floor 32 at the entrance 35 inside the baffle chamber 34. The enclosing wall 37 has an end-like annular shape that has one end 37a present on the side of the outlet 36 joined to the chamber wall 33 and the other end 37b separated from the chamber wall 33, and opens to one side in the Y direction when viewed in the Z direction. Make.

  The surrounding wall 37 surrounds the periphery of the entrance 35 in a state where a part of the side from the exit 36 toward the entrance 35 in the X direction is open when viewed in the Z direction. Specifically, the surrounding wall 37 surrounds the periphery of the entrance 35 in a state where the space between the other end 37b and the chamber wall 33 is open.

  By surrounding the periphery of the inlet 35 with the surrounding wall 37, the blow-by gas G <b> 1 immediately after flowing into the inside of the baffle chamber 34 from the inlet 35 is guided toward the top 32 a of the floor 32. Thereafter, the blow-by gas G1 flows through the spiral flow path formed by the chamber wall 33 and the surrounding wall 37, and heads toward the outlet 36.

  As described above, the surrounding wall 37 covers not only the side from the entrance 35 to the exit 36 in the X direction but also the peripheral edge of the entrance 35 except for a part of the side from the exit 36 to the entrance 35 in the X direction. It is configured as follows. This prevents the oil O1 from spreading radially from the inlet 35, and the oil L1 collected by the inertial collision returns from the inlet 35 to the cylinder head 11b, thereby reducing the amount of the oil O1 reaching the outlet 36. To be advantageous.

  The recess 38 is formed on the floor 32 of the baffle chamber 34 and is recessed downward in the Z direction. The recess 38 is formed on the side of the entrance 34 a of the baffle chamber 34 opposite to the side where the closed end of the surrounding wall 37 opens when viewed in the Z direction. The concave portion 38 is the lowest portion in the cross-sectional view (cross-sectional view in the YZ plane) of the inlet 34a in the baffle chamber 34, and the oil L1 collected by the inertial collision of the spiral flow path of the inlet 34a. It is the site where they gather.

  The drain holes 39a and 39b are holes that penetrate the floor 32 of the baffle chamber 34, and are holes that communicate the baffle chamber 34 and the cylinder head 11b. The drain holes 39a and 39b are holes for dropping the oil L1 separated inside the baffle chamber 34 to the cylinder head 11b so that the oil L1 does not flow into the oil separator device 21 outside the cover. The drain holes 39a and 39b are arranged in the non-scattering region R1.

  The non-scattered region R1 is a region where the oil scattered by the device housed in the cylinder head 11b is prevented from entering the baffle chamber 34. The non-scattered region R1 is a region on the lower end surface of the cylinder head cover 11c where oil (not shown) scattered by a device housed in the cylinder head 11b is unlikely to hit. The non-scattered region R1 is desirably a region in which the scattered oil does not hit regardless of the operating state of the engine 10. However, the non-scattering region R1 excludes a region where the splashed oil hits when the engine speed is high, even if the splashed oil does not hit when the engine speed is low or medium. Is also good.

  As a device housed in the cylinder head 11b, there is a device which drives and scatters lubricating oil or the like toward the lower end surface of the cylinder head cover 11c. In the present disclosure, the device that scatters oil is a device that scatters oil upward in the Z direction when the engine speed is in a high rotation range. Rocker arms 19b and cams 19d are examples of such a device for scattering oil. In addition, examples of a device that scatters oil include a gear device that rotationally drives a camshaft 19e (not shown) and a hydraulic device for a compression release brake that ejects oil from itself.

  That is, it is desirable that the non-scattering region R1 is a region in which no device for scattering oil is located below the Z direction, and there are no devices for scattering oil when viewed in the Z direction on both sides in the Y direction. Therefore, as the non-scattering region R1, a portion of the camshaft 19e accommodated in the cylinder head 11b where the cam 19d is not joined or a portion of the rocker arm shaft 19c where the rocker arm 19b is not joined is exemplified.

  The drain hole 39a is arranged at a corner near the outlet 36 of the baffle chamber 34. In the corner near the outlet 36, the oil L1 collected inside the baffle chamber 34 due to inertial collision at the outlet 34b by the floor 32 of the baffle chamber 34 inclined from upper left to lower right in FIG. It is the part that collects intensively.

  The drain hole 39b is disposed in the recess 38 of the entrance 34a of the baffle chamber 34. The depression 38 is the lowest part of the inlet part 34a and the terminal part of the spiral flow path of the blow-by gas G1. That is, the recess 38 is a portion where the oil L1 is concentratedly stored at the inlet 34a.

  The operation of the blow-by gas recirculation device 20 including the oil separator device 30 in the cover will be described. The blow-by gas G1 inside the crank chamber 11d reaches the inlet 35 from the passage formed around the cylinder 15 via the cylinder head 11b by the suction negative pressure of the compressor 14a in the intake passage 12. Next, the blow-by gas G1 flows into the baffle chamber 34 from the inlet 35. At this time, the oil L1 captured by the surrounding wall 37 due to the inertial collision flows from the inlet 35 into the cylinder head 11b without spreading radially from the inlet 35.

  Next, the blow-by gas G1 flows along the spiral flow path formed at the inlet portion 34a by being surrounded by the chamber wall 33 and the surrounding wall 37. At this time, the blow-by gas G1 inertia collides with the chamber wall 33 and the surrounding wall 37, and the oil L1 is collected. The collected oil L1 flows into the recess 38 along the slope of the floor 32 of the inlet 34a, and drops into the cylinder head 11b from the drain hole 39b.

  Next, the blow-by gas G1 flows in the outlet portion 34b in one direction in the X direction, and flows into the oil separator device 21 outside the cover from the outlet 36. The oil L1 that has not flowed into the oil separator device 21 outside the cover flows into the corner of the baffle chamber 34 along the slope of the floor 32 of the outlet 34b, and drops from the drain hole 39a to the cylinder head 11b.

  Next, the blow-by gas G1 is returned to the intake passage 12 from the gas return passage 22 after the oil L1 is separated by the oil separator device 21 outside the cover. The oil L1 separated by the oil separator device 21 outside the cover is returned from the oil return passage 23 to the crank chamber 11d.

  As described above, in the oil separator device 30 in the cover, the drain holes 39a and 39b for dropping the oil L1 from the baffle chamber 34 to the cylinder head 11b are formed by the device accommodated in the cylinder head 11b. It is arranged in the region R1. In other words, the drain holes 39a and 39b only allow the oil L1 accumulated in the baffle chamber 34 to drop onto the cylinder head 11b, and even when the engine speed is high, the device stored in the cylinder head 11b. The scattered oil does not hit and does not enter.

  As described above, according to the oil separator device 30 in the cover, the intrusion of oil from the drain holes 39a and 39b into the baffle chamber 34 is avoided, and the oil L1 separated from the blow-by gas G1 through the drain holes 39a and 39b efficiently. Can be discharged. This is advantageous for reducing the amount of oil L1 flowing out of the baffle chamber 34 to the oil separator device 21 outside the cover via the outlet 36, and the oil separator L21 cannot be separated by the oil separator device 21 outside the cover. Can be avoided. As a result, the amount of oil L1 contained in the recirculated blow-by gas G1 is reduced, and the occurrence of oil coking in the intake passage 12 can be suppressed.

  In the present disclosure, the oil caulking in the intake passage 12 means that the oil L1 reaching the inside of the compressor 14a is carbonized by heat. If such sticking of the wings or seizure of the shaft occurs due to oil coking, the supercharging efficiency is reduced. Therefore, according to the oil separator device 30 in the cover, by suppressing the occurrence of oil caulking, it is possible to avoid a situation where the supercharging efficiency is reduced.

  Also, the oil separator device 30 in the cover reduces the oil L1 flowing out of the outlet 36 by forming the drain hole 39b at a position midway in the flow path of the blow-by gas G1 from the inlet 35 to the outlet 36. Is advantageous. The drain hole 39b is preferably disposed at the inlet 34a where the flow path of the blow-by gas G1 in the baffle chamber 34 becomes spiral, and is more preferably disposed at the recess 38 of the inlet 34a. . By arranging the drain hole 39b at the inlet portion 34a, it becomes possible to drop more oil L1 onto the cylinder head 11b from the inlet portion 34a where the amount of collected oil L1 is larger than the outlet portion 34b. . In addition, since the drain hole 39b is disposed in the recess 38, the collected oil L1 is dropped into the cylinder head 11b from the recess 38 into which the collected oil L1 flows intensively. The amount of incoming oil L1 can be reduced.

  In the above-described embodiment, two drain holes 39b are arranged in the recess 38, but the number of the drain holes 39b is not particularly limited. Further, the hole diameter of the drain hole 39b is not particularly limited. When the amount of the oil L1 flowing out of the outlet 36 can be reduced by the drain hole 39b, the drain hole 39a may not be disposed at the corner of the outlet portion 34b.

  Further, the oil separator device 30 in the cover sets the non-scattering region R1 where the drain holes 39a and 39b are arranged, directly above a portion of the rocker arm shaft 19c housed in the cylinder head 11b where the rocker arm 19b is not joined. And a region immediately above a portion of the camshaft 19e to which the cam 19d is not joined. In other words, the drain holes 39a and 39b are disposed immediately above a portion where oil does not scatter even when the engine speed is in a high rotation range, so that the scattered oil flows from the drain holes 39a and 39b to the baffle chamber 34. This is advantageous for avoiding intrusion into the building. In the present disclosure, the area directly above is an area in which no other device is interposed.

  The in-cover oil separator device 30 includes, inside the baffle chamber 34, an enclosing wall 37 that surrounds the periphery of the inlet 35 in a state where a part of the side from the outlet 36 toward the inlet 35 in the X direction is open. Therefore, the surrounding wall 37 makes it possible to collect the oil L1 at the peripheral edge of the inlet 35, and returns the collected oil L1 from the inlet 35 to the cylinder head 11b.

  As described above, according to the oil separator device 30 in the cover, it is possible to prevent the oil L1 from flowing radially from the inlet 35, and to prevent the oil L1 from flowing to the vicinity of the outlet 36 due to the negative pressure by the surrounding wall 37. it can. This is advantageous for reducing the amount of oil L1 flowing from the baffle chamber 34 to the oil separator device 21 outside the cover via the outlet 36, and the oil separator L21 cannot be separated by the oil separator device 21 outside the cover. Can be avoided. As a result, the amount of oil L1 contained in the recirculated blow-by gas G1 is reduced, and the occurrence of oil coking in the intake passage 12 can be suppressed.

  Also, the oil separator device 30 in the cover closes one side of the flow path of the blow-by gas G1 with the chamber wall 33 and closes the other with the surrounding wall 37, so that the blow-by gas G1 at the inlet 34a is viewed in the Z direction. The channel is spiraled. As a result, the chance of separating the oil L1 due to inertial collision can be increased, which is advantageous in reducing the amount of the oil L1 contained in the recirculated blow-by gas G1.

  The oil separator device 30 in the cover is configured such that the surrounding wall 37 guides the blow-by gas G1 flowing into the baffle chamber 34 from the inlet 35 to the top 32a of the floor 32. In other words, the surrounding wall 37 blocks the flow of the oil L1 along the inclination of the floor 32 of the baffle chamber 34. This prevents the oil L1 from flowing out from the inlet 35 caused by the floor 32 of the baffle chamber 34 being tilted diagonally, and returning the oil L1 from the inlet 35 to the cylinder head 11b, thereby returning the blow-by gas G1 It is advantageous to reduce the amount of oil L1 contained in the oil.

  The oil separator device 30 in the cover is not limited to the one in which the chamber wall 33 and the surrounding wall 37 are erected in the Z direction. For example, the oil separator device 30 in the cover includes a baffle chamber 34 surrounded by both side faces of the cylinder head cover 11c facing the Y direction and a chamber wall 33 erected in the Y direction, and the inlet 35 and the drain holes 39a, 39b are provided. The present invention is also applicable to those formed on the chamber wall 33.

Reference Signs List 10 engine 11a cylinder block 11b cylinder head 11c cylinder head cover 11d crank chamber 30 oil separator device in cover 34 baffle chamber 35 inlet 36 outlet 37 surrounding wall

Claims (4)

A baffle chamber formed in the internal space of the cylinder head cover of the engine, an inlet formed in the baffle chamber and communicating with the crank chamber of the engine, and an outlet formed in the baffle chamber and communicating with the intake passage of the engine. In the oil separator device in a cover, wherein the inlet and the outlet are arranged in one direction apart in the baffle chamber,
An oil separator in a cover, wherein the baffle chamber includes an enclosing wall that surrounds a periphery of the entrance with a part of a periphery of the entrance facing the exit toward the entrance being opened. apparatus. The baffle chamber is surrounded by a ceiling of the internal space, a floor, and a chamber wall that forms an endless ring when viewed from the ceiling toward the floor, and the entrance is formed in the floor.
2. The enclosure according to claim 1, wherein the surrounding wall forms an end-like ring when viewed in the standing direction, and one end on the outlet side is joined to the chamber wall and the other end is separated from the chamber wall. Oil separator device in the cover.   3. The oil separator device in a cover according to claim 2, wherein the chamber wall and the surrounding wall form a spiral flow path in which the blow-by gas flows in the baffle chamber when viewed in the upright direction. 4. The floor is tilted diagonally in the baffle chamber,
4. The oil separator device according to claim 2, wherein the surrounding wall is configured to guide the blow-by gas flowing into the baffle chamber from the inlet to the top of the floor. 5.

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