JP5994362B2 - Engine oil separator - Google Patents

Description

  The present invention relates to an engine oil separation device, and more particularly to an engine oil separation device arranged on a return path of blow-by gas to an intake system.

  In a vehicular engine (internal combustion engine), blow-by gas including unburned gas and exhaust gas leaks into the crankcase from the combustion chamber through the gap between the cylinder and the piston, preventing air pollution and engine oil. In order to prevent deterioration, etc., a blow-by gas reduction device is provided to ventilate the crankcase.

  Of these blow-by gas reduction devices, those equipped with an oil separation device (oil separator) that captures and collects liquid components such as oil mist from high-temperature blow-by gas that is recirculated from the crankcase of the engine into the intake passage are often used. ing.

  As a conventional oil separation device of this type of engine, a cylindrical drain passage forming member that protrudes downward in the vertical direction from the bottom wall portion of the gas-liquid separation chamber and forms a drain passage leading to the gas-liquid separation chamber, A throttle hole-shaped discharge hole for discharging oil is arranged on the lower surface of the drain passage forming member, and the discharge hole is closed by the oil flowing down in the drain passage, so that blow-by gas passes through the drain passage and passes through the gas-liquid separation chamber. The thing which suppressed flowing in is known (for example, refer patent document 1).

JP 2011-074900 A

  However, when a gas-liquid separation chamber structure with high oil separation performance is adopted, the pressure loss in the gas-liquid separation chamber increases, that is, the negative pressure in the gas-liquid separation chamber increases. In the engine oil separation device in which the discharge hole is disposed on the lower surface of the passage forming member, the oil flowing down the outer surface of the drain passage forming member and concentrated on the lower surface enters the drain passage from the discharge hole. There was a problem that.

  In particular, when the drain passage forming member is disposed at a position where oil scattered from the camshaft is applied in the head cover, the amount of oil that adheres to the outer surface of the drain passage forming member and flows down to the lower surface is large. There was a problem that the oil easily entered.

  The present invention has been made in order to solve the above-described conventional problems, and the oil that has flew by cam hoisting directly enters the discharge hole or flows down the outer surface of the drain passage forming member. An object of the present invention is to provide an oil separation device for an engine that can prevent oil from entering from a discharge hole.

In order to achieve the above object, an oil separation apparatus for an engine according to the present invention is (1) disposed in a head cover of an engine, separating oil contained in blow-by gas generated inside the engine, and separating the oil. An oil separation device for an engine that recirculates a subsequent blow-by gas to an intake passage of the engine, wherein the oil-liquid separation chamber separates the oil from the blow-by gas, and projects vertically downward from the gas-liquid separation chamber. A bottomed cylindrical drain passage forming member that forms a drain passage that communicates with the gas-liquid separation chamber, and the drain passage forming member is a side surface of the drain passage forming member and is connected to the nearest valve drive cam. while opening at a position not pair, it has a discharge hole for discharging the oil flowing down the drain passage is separated by the gas-liquid separation chamber to the outside, the de It flows down along the side surface by tilting obliquely downward along the side surface vertically above the discharge hole on the side surface of the passage forming member and setting the lower end of the slope to a position horizontally spaced from the discharge hole. The oil flow-down path is changed, and an oil circulation shielding member for guiding the oil is provided at a position spaced horizontally from the discharge hole .

  Unlike the case where the drain hole is formed on the lower surface of the drain passage forming member where the oil that has flowed down is collected by this configuration, the discharge hole is formed on the side surface upstream in the flow direction from the lower surface where the oil is concentrated. Oil is prevented from being sucked from the discharge hole.

  In addition, since the oil pumped up to the valve drive cam does not directly adhere to the discharge hole formed on the side surface of the drain passage forming member and not facing the nearest valve drive cam, The oil pumped up by the valve drive cam is not directly sucked from the discharge hole.

  Also, on the side of the drain passage forming member that does not face the nearest valve drive cam, the amount of oil that flows down from the upper part of the discharge hole through the surface is small, so that the oil is prevented from being sucked from the discharge hole. The

  Therefore, it is possible to prevent the oil flying by the lifting of the valve drive cam from directly entering the discharge hole or the oil flowing down along the side surface of the drain passage forming member from entering the discharge hole.

  With this configuration, the oil that flows down along the side surface of the drain passage forming member is guided to a position separated from the discharge hole, so that the oil can be prevented from entering the discharge hole.

In the engine oil separation device having the configuration described in (1 ) above, ( 2 ) it is preferable that the discharge hole is disposed on the opposite side of the direction facing the nearest valve drive cam.

  With this configuration, the amount of oil that is scooped up by the valve drive cam and adheres to the surface of the drain passage forming member and flows down is the smallest on the surface of the drain passage forming member opposite to the valve drive cam. Therefore, it is possible to further prevent oil from entering the discharge hole.

In the engine oil separator having the configuration according to any one of (1) to ( 2 ), ( 3 ) the drain passage forming member is supplied to the valve drive cam by the rotation of the nearest valve drive cam. It is preferable to arrange in the direction in which the oil to be pumped up.

  Due to this configuration, due to restrictions on mounting the gas-liquid separation chamber and drain passage forming member in the internal space of the head cover, the drain passage forming member can be placed in the discharge hole even when the drain passage forming member is installed in the direction of pumping up the oil by the valve drive cam. Oil can be prevented from entering.

  According to the present invention, the drain passage forming member opens to a side surface of the drain passage forming member and does not face the nearest valve drive cam, and is separated in the gas-liquid separation chamber to flow down the drain passage. Since it is configured to have a discharge hole for discharging oil to the outside, the oil that flies by lifting the valve drive cam directly enters the discharge hole or travels along the side of the drain passage forming member. Therefore, it is possible to provide an oil separation device for an engine that can prevent oil flowing down from entering through the discharge hole.

1 is a cross-sectional view of an engine equipped with an engine oil separation device according to a first embodiment of the present invention. It is principal part sectional drawing of the oil separation apparatus of the engine which concerns on the 1st Embodiment of this invention. It is a partial section perspective view of the oil separation device of the engine concerning a 1st embodiment of the present invention. It is a fragmentary sectional view of the oil separation device of the engine concerning a 1st embodiment of the present invention. It is principal part sectional drawing of the oil separation apparatus of the engine which concerns on the 1st Embodiment of this invention. It is a perspective view of the drain passage formation member of the oil separation device of the engine concerning a 2nd embodiment of the present invention. It is a perspective view of the drain passage formation member of the oil separation device of the engine concerning a 2nd embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIGS. 1-5 is a figure which shows 1st Embodiment of the oil separation apparatus of the engine which concerns on this invention.

  First, the configuration will be described. The engine oil separator according to the present embodiment shown in FIGS. 2 to 5 is installed in the in-line multi-cylinder internal combustion engine shown in FIG. 1, for example, a four-cycle gasoline engine (hereinafter simply referred to as an engine) 10. Yes.

As shown in FIG. 1, the engine 10 includes a head cover 11, a cylinder head 12, a cylinder block 13, and a crankcase 14 in order from the top in the figure, and a plurality of cylinders 13 a of the cylinder head 12 and the cylinder block 13. A plurality of cylinders 15 are formed (only one is shown in the figure).
Here, the head cover 11, the cylinder head 12, the cylinder block 13, and the crankcase 14 constitute a block (engine block) that forms the outer wall of the engine 10.

Each cylinder 15 accommodates a piston 16, and although not shown in detail, a crankshaft 17 in the crankcase 14 is connected to each piston 16 via a connecting rod 18.
An oil pan 19 is provided at the lower part of the crankcase 14, and contains engine oil for lubrication and cooling (hereinafter simply referred to as oil) (not shown).

A known valve operating mechanism 20 and ignition device 23 are accommodated inside the head cover 11 and the cylinder head 12, and the valve operating mechanism 20 is driven based on power from the crankshaft 17. .
The engine 10 is provided with an oil pump (not shown) that is driven based on the power of the crankshaft 17. The oil pump pumps oil from the oil pan 19 and camshafts 21 and 22 of the valve mechanism 20. Etc., or each rotating / sliding portion such as a bearing portion of the crankshaft 17 is lubricated and cooled.

  Air is sucked into the combustion chamber 10a formed in the upper part of the piston 16 in each cylinder 15 through the intake passage 31 and the intake port 10b according to the stroke of the piston 16, and after combustion in the combustion chamber 10a. The exhaust gas is exhausted to the outside of the engine 10 through the exhaust port 10c and an exhaust passage (not shown).

  The intake passage 31 of the engine 10 includes a throttle body 33 that accommodates the throttle valve 32 so that the throttle valve 32 can be opened and closed, and an upstream intake pipe 34 and a downstream intake pipe provided on the upstream and downstream sides of the throttle body 33 in the intake direction. 35.

  An air cleaner 36 having a filter element 36 f is provided on the upstream side of the upstream side intake pipe 34, and air from which dust or the like has been removed by the air cleaner 36 is taken into the upstream side intake pipe 34. Yes.

  The downstream side intake pipe 35 is formed integrally with the surge tank 37, and is fastened and fixed to the cylinder head 12 that forms the intake port 10 b of the engine 10. A fuel injection valve 24 is mounted near the intake port 10b of the cylinder head 12 to which the downstream intake pipe 35 is fixed.

  On the other hand, during operation of the engine 10, blow-by gas including unburned gas and exhaust gas leaks from the combustion chamber 10 a through the gap between the cylinder 13 a and the piston 16 into the internal space of the crankcase 14.

  Therefore, the engine 10 is equipped with a PCV type blow-by gas reduction device that forcibly ventilates the inside of the crankcase 14 in order to prevent air pollution, oil deterioration inside the engine 10, and corrosion prevention. The oil separator 50 of the present embodiment is provided in the blow-by gas recirculation path.

  Specifically, the engine 10 is formed with at least one ventilation passage 10v that communicates the inner space of the head cover 11 and the cylinder head 12 that accommodates the valve mechanism 20 and the inner space of the crankcase 14.

Further, between the engine 10 and the upstream side intake pipe 34, there is an air introduction pipe 41 that introduces fresh air from the intake passage 31 a upstream of the throttle valve 32, that is, new air directly into the engine 10. It is intervened.
Between the engine 10 and the downstream side intake pipe 35, a blowby gas recirculation pipe 42 that recirculates blowby gas generated inside the cylinder block 13 and the crankcase 14 to the intake passage 31 b on the downstream side of the throttle valve 32. A PCV valve 43 capable of opening and closing a reflux passage in the blow-by gas reflux pipe 42 and an oil separator 50 located in the middle of the blow-by gas reflux path 44 via the blow-by gas reflux pipe 42 are provided. Yes.

  The oil separation device 50 forms a gas-liquid separation chamber 51 in a part of the blow-by gas recirculation path 44 via the blow-by gas recirculation pipe 42, and the mist-like oil contained in the blow-by gas in the gas-liquid separation chamber 51. The oil component is separated from the blow-by gas by capturing the gas in a recoverable manner.

  The oil separation device 50 forms a substantially bottomed cylindrical drain passage forming member 62 that hangs downward from the gas-liquid separation chamber 51 at the lower portion of the gas-liquid separation chamber 51. Oil separated from blow-by gas in the gas-liquid separation chamber 51 is discharged through a drain passage 65 (see FIG. 2), which will be described later, which is an internal space.

  In the present embodiment, the camshafts 21 and 22 of the valve mechanism 20 are configured to rotate clockwise as indicated by an arrow a. In addition, due to restrictions on mounting the oil separation device 50 in the internal space of the head cover 11, the gas-liquid separation chamber 51 of the oil separation device 50 is disposed in the space above the camshaft 22, and the drain passage forming member of the oil separation device 50 is provided. 62 is disposed in a space outside the camshaft 22 (leftward in FIG. 1).

  Therefore, as described above, the oil pumped up from the oil pan 19 by the oil pump is dripped onto the camshaft 22, so that the valve drive cams 22 a to 22 d provided on the camshaft 22 (FIG. 2 to FIG. 2). The oil pumped up by (see FIG. 4) is likely to fly to the oil pumping direction indicated by the arrow b, that is, toward the side where the drain passage forming member 62 is arranged, and is easily applied to the drain passage forming member 62. Yes.

  Next, a detailed configuration of the oil separation device 50 will be described. As shown in FIGS. 2 to 4, a plurality of substantially cylindrical cyclone portions 51 c formed in a tapered shape with the lower end opened are provided in the gas-liquid separation chamber 51. The blow-by gas introduced from the gas inlet 53 is supplied along the tangential direction to the internal space above each cyclone 51c.

  The blow-by gas introduced into each cyclone portion 51c changes from a linear flow to a vortex flow inside the cyclone portion 51c, and rotates and descends spirally while increasing the rotation speed along the inner wall of the cyclone portion 51c. At this time, the relatively fine mist-like oil contained in the blow-by gas is separated from the blow-by gas by obtaining a centrifugal force by the swirling motion and colliding with the inner wall of the cyclone part 51c, and is transmitted along the inner wall of the cyclone part 51c. The liquid is collected while flowing down and is dropped from the lower end onto the upper surface of the bottom wall member 61 of the gas-liquid separation chamber 51.

  On the other hand, the blow-by gas from which oil has been separated and removed flows into a gas outlet pipe (not shown) disposed coaxially with the central axis inside the cyclone portion 51 c and is discharged from the oil separation device 50. The discharged blowby gas is returned to the intake system of the engine 10 through the PCV valve 43. In this way, the oil separator 50 functions as a tangential inflow tandem cyclone separator.

  The PCV valve 43 opens according to the pressure in the internal space of the oil separator 50 and the intake negative pressure of the intake system. Further, the PCV valve 43 may be constituted by an electromagnetic valve that can be freely opened and closed.

  Further, the internal configuration itself of the gas-liquid separation chamber 51 of the oil separation device 50 is not limited to the cyclonic configuration using the centrifugal separation action as described above, and may be a configuration using other methods. For example, as the internal configuration of the gas-liquid separation chamber 51, a collision plate that blocks the flow of blow-by gas is provided inside the gas-liquid separation chamber 51, and the mist-like oil contained in the blow-by gas collides with the collision plate by the blow-by gas. The structure of inertial collision type that attaches to the collision plate or collects it, or the partition plate is provided inside the gas-liquid separation chamber 51 to increase the floating distance of the mist-like oil and the oil falls by its own weight A labyrinth (maze) type configuration may be used. Alternatively, the internal configuration of the gas-liquid separation chamber 51 may be a combination of these cyclone type, inertial collision type, and labyrinth type.

  The oil separation device 50 includes a bottom wall member 61 that forms an inner bottom wall surface 51a of the gas-liquid separation chamber 51 so as to collect the oil separated in the gas-liquid separation chamber 51, and a vertically downward direction from the bottom wall member 61. And a drain passage forming member 62 having a substantially bottomed cylindrical shape that forms a drain passage 65 having a circular cross section that protrudes to the side (or may be inclined) and communicates with the gas-liquid separation chamber 51.

  The bottom wall member 61 is supported by the head cover 11 of the engine 10. For example, the bottom wall member 61 is attached to the head cover 11 as a part of the head cover 11, thereby partitioning the space on the valve mechanism 20 side and the gas-liquid separation chamber 51. ing. Alternatively, the bottom wall member 61 is supported by the head cover 11 so as to be positioned on the inner side of the head cover 11, thereby serving as a baffle plate that restricts scattering of oil from the valve operating mechanism 20 side. Alternatively, it may be supported by the head cover 11 so as to be located on the outer side of the head cover 11, and the drain passage forming member 62 may penetrate a part of the head cover 11.

  The bottom wall member 61 is at least internally disposed so as to guide oil that has flowed down on the inner bottom wall surface 51a of the gas-liquid separation chamber 51 by gas-liquid separation of the blow-by gas in the gas-liquid separation chamber 51 into a drain passage 65 described later. The upper surface side forming the bottom wall surface 51a is inclined with respect to the horizontal plane.

  The bottom wall member 61 and the drain passage forming member 62 are made of, for example, the same resin excellent in heat resistance and molding accuracy, and are integrated by molding or by partial welding after molding. Further, the drain passage forming member 62 and the internal drain passage 65 have a gentle taper shape such as a die cutting gradient for injection molding of the drain passage forming member 62, for example.

  The drain passage forming member 62 includes a substantially cylindrical tubular portion 62a that constitutes a side surface thereof, and a disk-like bottom wall portion 62b that constitutes a bottom surface thereof and closes a lower end side of the tubular portion 62a. Yes.

  The cylindrical part 62a has a relatively large diameter on the upper end side connected to the bottom wall member 61 in order to give a die-cutting gradient at the time of injection molding, and a bottom wall part 62b is formed. The taper is tapered so that the diameter is relatively small on the lower end side.

  A drain hole 62h that communicates with the internal drain passage 65 and opens in a substantially horizontal direction is formed on the lower side surface of the cylindrical portion 62a of the drain passage forming member 62. The discharge hole 62 h communicates with the lower end portion of the drain passage 65 inside the drain passage forming member 62.

  In other words, the discharge hole 62h is disposed at a position substantially equal to the upper surface of the bottom wall portion 62b in the vertical direction. As a result, the oil flowing down in the drain passage 65 is quickly discharged from the discharge hole 62h without staying on the upper surface of the bottom wall portion 62b at the lower end. The discharge hole 62h is formed in a circular shape, and its diameter is set to about 4 mm, for example.

  The camshaft 22 has a plurality of valve driving cams for driving a valve corresponding to any of the plurality of cylinders 15 (only some of the valve driving cams 22a, 22b, 22c, and 22d are shown in FIGS. 3 and 4). Is provided. Among these valve drive cams 22a, 22b, 22c, and 22d, the valve drive cam 22b is the nearest valve drive cam for the drain passage forming member 62 and the discharge hole 62h formed in the drain passage forming member 62.

  Here, as described above, the oil pumped up from the oil pan 19 by the oil pump is dripped onto the camshaft 22. For this reason, the oil is scooped up and flew toward the drain passage forming member 62 as shown by the arrow b by the clockwise rotation shown by the arrow a of the valve drive cam 22b provided on the camshaft 22. become. The oil adheres and flows down mainly on the surface of the drain passage forming member 62 facing the valve drive cam 22 b and concentrates on the lower surface of the drain passage forming member 62.

  Therefore, in the present embodiment, the oil pumped up by the valve drive cam 22b is prevented from directly entering the discharge hole 62h and the oil flowing down from the upper part of the discharge hole 62h is prevented from entering the discharge hole 62h. Therefore, the discharge hole 62h is a side surface of the drain passage forming member 62 and is opened at a position not facing the valve drive cam 22b nearest to the discharge hole 62h. That is, the discharge hole 62h is formed not in the bottom wall portion 62b of the drain passage forming member 62 but in the cylindrical portion 62a, and is disposed at a position not facing the valve drive cam 22b.

  2 to 4, the discharge hole 62h is located at a position (hereinafter referred to as a side surface position) that opens in a direction (hereinafter referred to as a side surface direction) when the drain passage forming member 62 is viewed from the valve drive cam 22b. Has been placed. In other words, the discharge hole 62h is open in a direction orthogonal to a line connecting the discharge hole 62h and the valve drive cam 22b in a substantially horizontal plane.

  Further, as shown in FIG. 5, the discharge hole 62 h is a position (hereinafter referred to as a rear position) that opens in a direction (hereinafter referred to as a rear direction) when viewed from the valve drive cam 22 b when the drain passage forming member 62 is viewed. ). Here, in other words, the back direction is the direction opposite to the direction facing the nearest valve drive cam 22b.

  When the discharge hole 62h is provided at the rear surface position, oil flying toward the discharge hole 62h due to the valve drive cam 22b being lifted up or from the upper part of the discharge hole 62h, compared to when the discharge hole 62h is provided at the side surface position. Since less oil flows down, it is possible to further prevent oil from entering the discharge hole 62h.

  The position of the discharge hole 62h is not strictly limited only to the side surface position of the drain passage forming member 62 illustrated in FIGS. 2 to 4 or the back surface position of the drain passage forming member 62 illustrated in FIG. Any position that does not face the valve drive cam 22b in the cylindrical portion 62a of the drain passage forming member 62 may be used.

  2-5, the position of the lower end of the drain hole 62h and the drain passage forming member 62 in which the discharge hole 62h is disposed is disposed vertically below the central axis of the valve drive cam 22b. The vertical position of the discharge hole 62h and the lower end portion of the drain passage forming member 62 where the discharge hole 62h is disposed may be above the central axis of the valve drive cam 22b.

  Next, the operation will be described. In the engine oil separation device according to the present embodiment configured as described above, the drain passage forming member 62 having the drain passage 65 therein has a restriction on mounting the oil separation device 50 in the internal space of the head cover 11. It is arranged in the oil pumping direction by the nearest valve drive cam 22b.

  For this reason, the oil splashed up by the valve drive cam 22b mainly adheres to the surface of the drain passage forming member 62 that faces the valve drive cam 22b, and travels down the surface of the drain passage forming member 62 to the lower part. It flows down, gathers at its lower end, and drops downward.

  That is, the splashed oil scooped up on the valve drive cam 22b adheres and flows down mainly on the surface of the cylindrical portion 62a of the drain passage forming member 62 facing the valve drive cam 22b. They are collected on the surface of the bottom wall 62b and dropped downward.

  On the other hand, the amount of oil that is scooped up by the valve drive cam 22b and adheres to the surface of the drain passage forming member 62 is smaller than that of the surface of the drain passage forming member 62 facing the valve drive cam 22b. The number is smaller on the side surface in which the discharge hole 62h is provided at the position shown in FIGS. 1 to 4, and the number is smaller on the rear surface in which the discharge hole 62h is provided at the position shown in FIG.

  Therefore, unlike the case where the discharge hole 62h is formed in the bottom wall portion 62b where the oil flowing down is concentrated, the discharge hole 62h is formed in the cylindrical portion 62a upstream of the bottom wall portion 62b where the oil is concentrated. Therefore, the oil is prevented from being sucked from the discharge hole 62h.

  Further, since the oil pumped up to the valve drive cam 22b does not directly adhere to the discharge hole 62h formed in the side surface position or the back surface position of the cylindrical portion 62a, the oil is lifted up to the valve drive cam 22b. The obtained oil is not directly sucked from the discharge hole 62h.

  Further, in the side surface portion and the rear surface portion with respect to the valve drive cam 22b, there is little oil flowing down from the upper portion of the discharge hole 62h along the surface of the cylindrical portion 62a, so that the oil flowing down along the surface of the cylindrical portion 62a is discharged. Inhalation through the hole 62h is prevented.

  As described above, in the present embodiment, the drain passage forming member 62 opens to a position on the side surface of the drain passage forming member 62 so as not to face the nearest valve drive cam 22b. And having a discharge hole 62h for discharging the oil flowing down the drain passage 65 to the outside.

  With this configuration, unlike the case where the discharge hole 62h is formed on the lower surface of the drain passage forming member 62 where the oil flowing down is collected, the discharge hole 62h is formed on the side surface upstream in the flow direction from the lower surface where the oil is collected. Therefore, the oil is prevented from being sucked from the discharge hole 62h.

  Further, the oil pumped up to the valve drive cam 22b is directly attached to the discharge hole 62h formed on the side surface of the drain passage forming member 62 and not facing the nearest valve drive cam 22b. Therefore, the oil pumped up by the valve drive cam 22b is not directly sucked from the discharge hole 62h.

  Further, on the side of the drain passage forming member 62 that does not face the nearest valve drive cam 22b, there is little oil flowing down from the upper part of the discharge hole 62h along the surface, so oil is sucked from the discharge hole 62h. It is prevented.

  Therefore, it is possible to prevent the oil flying by the valve drive cam 22b from directly entering the discharge hole 62h or the oil flowing down along the side surface of the drain passage forming member 62 from entering the discharge hole 62h. Can do.

  Further, in the present embodiment, the discharge hole 62h is configured to be disposed on the side opposite to the direction facing the nearest valve drive cam 22b.

  With this configuration, the amount of oil that is scooped up by the valve drive cam 22b and adheres to the surface of the drain passage forming member 62 is reduced on the opposite side of the direction opposite to the valve drive cam 22b of the drain passage forming member 62. Since it is the smallest in terms of surface, it is possible to further prevent oil from entering the discharge hole 62h.

  Further, in the present embodiment, the drain passage forming member 62 is configured to be arranged in a direction in which oil supplied to the valve drive cam 22b is pumped up by the rotation of the nearest valve drive cam 22b.

  With this configuration, even if the drain passage forming member 62 is installed in the direction of pumping up the oil by the valve drive cam 22b due to restrictions on mounting the gas-liquid separation chamber 51 and the drain passage forming member 62 in the internal space of the head cover. The oil can be prevented from entering the discharge hole 62h.

(Second Embodiment)
6 and 7 are views showing a second embodiment of the engine oil separator according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. To do.

  As shown in FIGS. 6 and 7, the oil flow down the surface of the cylindrical part 62 a is changed in the vicinity of the upper part of the discharge hole 62 h of the cylindrical part 62 a of the drain passage forming member 62. An oil flow blocking member 66 or an oil flow blocking member 67 is provided to prevent the oil from being sucked into the discharge hole 62h by guiding the oil to a position separated from the hole 62h.

  In FIG. 6, the oil circulation blocking member 66 is formed in a gable roof shape protruding radially outward from the surface of the cylindrical portion 62a, and is composed of two inclined portions 66a and 66b. The oil circulation blocking member 66 guides the oil flowing down from the upper side of the discharge hole 62h toward the discharge hole 62h in the horizontal direction in the direction away from the discharge hole 62h by the two inclined portions 66a and 66b. Thus, the oil is prevented from being sucked into the discharge hole 62h.

  In FIG. 6, the inclined portion 66 a and the inclined portion 66 b are coupled at a position vertically above the discharge hole 62 h, and the vertically upward position is separated from the vertically upward position as the apex. It is inclined at. The oil flowing down from the upper side of the discharge hole 62h toward the discharge hole 62h is branched at the apex portion where the inclined portion 66a and the inclined portion 66b are joined, and one of the oils is guided to the left in the drawing by the inclined portion 66a. At the same time, the other is guided to the right in the drawing by the inclined portion 66b.

  As a result, the oil guided to the lower ends of the inclined portions 66a and 66b flows down at a position sufficiently separated from the discharge hole 62h in the horizontal direction, so that the oil is prevented from being sucked into the discharge hole 62h.

  Further, as shown in FIG. 7, a single-flow roof-shaped oil circulation blocking member 67 protruding radially outward from the surface of the cylindrical portion 62a is provided in the vicinity of the upper portion of the discharge hole 62h. The oil that flows down from the upper side of the discharge hole 62h toward the discharge hole 62h is guided in a direction away from the discharge hole 62h in the horizontal direction, thereby preventing the oil from being sucked into the discharge hole 62h. May be.

  In FIG. 7, a central portion between the upper end of the oil flow blocking member 67 and the lower end of the tilt is disposed at a position vertically above the discharge hole 62 h. The oil that flows down from the upper side of the discharge hole 62h toward the discharge hole 62h is guided in the right direction on the paper surface by the oil circulation blocking member 67, so that the oil is prevented from being sucked into the discharge hole 62h.

  Further, the drain passage forming member 62 is formed in a cylindrical shape having a square cross section. For this reason, the oil flowing down the surface adjacent to the surface provided with the oil circulation blocking member 67 and the discharge hole 62h is prevented from moving to the surface provided with the discharge hole 62h and being sucked into the discharge hole 62h. The

  The inclined lower end of the oil circulation blocking member 67 extends to the boundary between the surface where the oil circulation blocking member 67 and the discharge hole 62h are provided and the adjacent surface. For this reason, a part of the oil flowing down the cylindrical portion 62a of the drain passage forming member 62 is guided to the surface adjacent to the surface provided with the discharge hole 62h by the oil flow blocking member 67. The oil is further prevented from being sucked into 62h.

  In FIG. 7, the discharge hole 62 h is formed in a square shape. However, in the bottomed cylindrical drain passage forming member 62 as shown in FIG. 6, a rectangular discharge hole 62 h may be provided. Moreover, in the bottomed cylindrical drain passage forming member 62 as shown in FIG. 6, a single-flow roof-shaped oil circulation blocking member 67 as shown in FIG. 7 may be provided.

  As described above, in this embodiment, the flow path of the oil flowing down along the side surface is changed above the discharge hole 62h on the side surface of the drain passage forming member 62, and the oil is guided to a position separated from the discharge hole 62h. It is comprised from what provided the oil distribution | circulation shielding member to do.

  With this configuration, the oil flowing down along the side surface of the drain passage forming member 62 is guided to a position separated from the discharge hole 62h, so that the oil can be prevented from entering the discharge hole 62h.

  As described above, the oil separation device for an engine according to the present invention is such that the oil flying by cam hoisting directly enters the discharge hole or flows down along the outer surface of the drain passage forming member. It is possible to prevent intrusion from the engine, and is useful for all oil separation devices for engines arranged on the recirculation path of blow-by gas to the intake system.

DESCRIPTION OF SYMBOLS 10 Engine 11 Head cover 21, 22 Camshaft 22a-22d Valve drive cam 31 Intake passage 42 Blow-by gas recirculation pipe 43 PCV valve 44 Blow-by gas recirculation path 50 Oil separator 51 Gas-liquid separation chamber 51a Inner bottom wall surface 51c Cyclone part 53 Gas introduction Port 61 Bottom wall member 62 Drain passage forming member 62a Tubular portion 62b Bottom wall portion 62h Discharge hole 65 Drain passage 66, 67 Oil distribution blocking member 66a, 66b Inclined portion

Claims (3)

An engine oil separation device that is disposed in an engine head cover and separates oil contained in blow-by gas generated in the engine and returns the blow-by gas after separation to the intake passage of the engine. And
A gas-liquid separation chamber for separating the oil from the blow-by gas;
A bottomed cylindrical drain passage forming member that protrudes vertically downward from the gas-liquid separation chamber and forms a drain passage leading to the gas-liquid separation chamber;
The drain passage forming member opens to a position on the side surface of the drain passage forming member that does not face the nearest valve drive cam, and the oil separated in the gas-liquid separation chamber and flowing down the drain passage is externally supplied. have a discharge hole to discharge to,
Flowing down the side surface of the drain passage forming member vertically above the discharge hole, inclined obliquely downward along the side surface, and the lower end of the inclined surface being horizontally spaced from the discharge hole. An oil separation device for an engine, characterized in that an oil flow shielding member for changing the oil flow path to guide the oil is provided at a position spaced horizontally from the discharge hole . 2. The engine oil separator according to claim 1, wherein the discharge hole is disposed on a side opposite to a direction facing the nearest valve drive cam. 3. The engine according to claim 1, wherein the drain passage forming member is disposed in a direction in which oil supplied to the valve drive cam is scraped up by rotation of the nearest valve drive cam. Oil separator.

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