JP6970252B1 - Engine with blow-by gas treatment and blow-by gas treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine provided with a blow-by gas treatment device and a blow-by gas treatment device capable of suppressing the retention of oil contained in blow-by gas and suppressing the freezing of water contained in oil at a low temperature. To do. A blow-by gas processing apparatus 100 guides a separation unit 330 that separates a blow-by gas BG taken from a blow-by gas intake unit into oil and gas, and an oil separated from the blow-by gas BG by the separation unit 330. The oil guide units 151 and 152 are provided. The separation unit 330 is provided so as to be inclined in a direction in which the oil separated from the blow-by gas BG by the separation unit 330 is guided to the oil guide units 151 and 152. [Selection diagram] FIG. 4

Description

The present invention relates to an engine that is mounted on an internal combustion engine such as a diesel engine and includes a blow-by gas processing device and a blow-by gas processing device that separates blow-by gas into oil and gas for processing.

For example, the head cover of a diesel engine has a built-in blow-by gas filter. The blow-by gas filter separates blow-by gas into oil and a gas such as unburned gas.

Patent Document 1 discloses an oil mist separator capable of improving the oil separation efficiency by discharging the scattered oil flowing into the gas flow path to the cam chamber side at a position away from directly below the gas introduction port. The oil mist separator described in Patent Document 1 separates oil from blow-by gas flowing in a gas flow path.

Between the cylinder head cover and the baffle plate, a room partitioned from the gas flow path including the gas inlet and a first guide wall are provided. The first guide wall extends downwardly inclined toward the gas inlet and the room above the gas inlet and the room. The baffle plate has a drain hole formed in the horizontal inner bottom of the room for draining oil in the room.

As a result, the scattered oil that has flowed into the gas flow path among the scattered oil that is flipped up by the rotation of the camshaft collides with the inclined first guide wall and is guided into the room through the first guide wall. .. Then, the scattered oil in the room is discharged to the cam chamber side at a position away from directly under the gas inlet through the drain hole of the room, thereby improving the oil separation efficiency.

JP-A-2018-119474

However, in the oil mist separator described in Patent Document 1, a drain hole is formed in the horizontal inner bottom portion of the room. Therefore, even if there is a drain hole, the inner bottom of the room is parallel to the installation surface (for example, a horizontal plane) on which the vehicle on which the engine is mounted is placed. Therefore, even if the drain hole is formed on the horizontal inner bottom surface, the scattered oil may stay on the horizontal inner bottom portion of the room.

The scattered oil contains water (water vapor). Therefore, the water contained in the stagnant scattered oil may freeze at the horizontal inner bottom of the room at low temperatures. If the water contained in the accumulated scattered oil freezes, it may block the horizontal inner bottom surface and drain hole of the room. Then, the scattered oil in the room cannot pass through the drain hole formed in the horizontal inner bottom portion, and is not discharged to the cam room side at a position away from directly under the gas inlet. In this respect, the oil mist separator described in Patent Document 1 has room for improvement.

The present invention has been made to solve the above problems, and can suppress the retention of oil contained in blow-by gas and prevent the water contained in the oil from freezing at a low temperature. It is an object of the present invention to provide an engine equipped with a blow-by gas processing device and a blow-by gas processing device.

The subject is a blow-by gas processing apparatus for treating blow-by gas generated in an engine, a flow velocity increasing operation unit for increasing the flow velocity of the blow-by gas along a direction inclined with respect to the vertical direction, and the flow velocity increasing operation unit. A collision plate that collides the blow-by gas whose flow velocity has increased to separate the oil and the gas, an oil guide portion that guides the oil separated from the blow-by gas toward the inside of the engine, and the collision plate. The oil that is connected to the surface of the flow velocity increasing operation unit facing the oil guide unit and is inclined downward from the surface toward the oil guide unit and flows along the surface of the oil guide unit. The surface is inclined downward toward the oil guide portion, and the inclination angle of the oil outlet inclination guide portion with respect to the horizontal plane is larger than the inclination angle of the surface with respect to the horizontal plane. It is solved by the blow-by gas treatment apparatus according to the present invention, which is characterized by being large.

According to the blow-by gas processing apparatus according to the present invention, the flow velocity increasing operation unit causes the blow-by gas to collide with the collision plate while increasing the flow velocity of the blow-by gas along a direction inclined with respect to the vertical direction (vertical direction). This ensures that the blow-by gas is separated into oil and gas. Then, the oil separated from the blow-by gas in the collision plate falls on the surface of the flow velocity increasing operation unit facing the collision plate. Here, the surface of the flow velocity increasing operation portion is inclined downward toward the oil guide portion. Therefore, the oil that has fallen on the surface of the flow velocity increasing operation unit flows on the surface of the flow velocity increasing operation unit by its own weight and is guided to the oil guide unit. Thereby, the blow-by gas treatment apparatus according to the present invention can suppress the retention of the oil contained in the blow-by gas and suppress the freezing of the water contained in the oil at a low temperature. Thus, the operation for separating the blanking Robaigasu in the oil and gas is performed more reliably.
Further, the oil outlet inclination guide portion is connected to the surface of the flow velocity increase operation unit and the oil guide portion, and is inclined downward from the surface of the flow velocity increase operation unit toward the oil guide portion. Then, the oil outlet inclination guide portion guides the oil flowing along the surface of the flow velocity increase operation portion to the oil guide portion. Here, the inclination angle of the oil outlet inclination guide portion with respect to the horizontal plane is larger than the inclination angle of the surface of the flow velocity increasing operation portion with respect to the horizontal plane. As a result, the oil outlet inclined guide portion can quickly guide the oil separated from the blow-by gas and flowing along the surface of the flow velocity increasing operation portion to the oil guide portion. Further, it is possible to prevent the oil from staying in the vicinity of the surface of the flow velocity increasing operation portion, and to prevent the oil separated from the blow-by gas from being mixed into the blow-by gas again.

Blow-by gas processing equipment according to the present invention is preferably provided between the impingement plate and the flow velocity increased operating unit, and further comprising a filter through which the blow-by gas.

Blow-by gas processing apparatus according to the present invention further comprises a filter through which blow-by gas. The filter is provided between the flow velocity increasing operation unit and the collision plate. Accordingly, oil separated from the blow-by gas in opposition veneer passes through the filter, fall on the surface of the ramped flow rate operation part facing the impact plate. Therefore, the blow-by gas is surely separated into the oil and the gas.

The blow-by gas processing apparatus according to the present invention preferably has the filter and the collision plate mounted therein, and further includes a setting unit for inclining the filter and the collision plate downward toward the oil guide portion. It is characterized by that.

According to the blow-by gas processing apparatus according to the present invention, a setting unit on which a filter and a collision plate are placed is further provided. The setting unit tilts the filter and the collision plate downward toward the oil guide unit. As a result, the oil separated from the blow-by gas in the collision plate falls through the filter to the surface of the flow velocity increasing operation unit, and is reliably guided by the oil guide unit.

In the blow-by gas processing apparatus according to the present invention, preferably, the setting unit includes, from front Symbol surface outwardly protruding to form an oil guide clearance area as a space between said surface filter prior Symbol blow the separated from the gas oil is characterized by flowing along the front Symbol surface that put in the oil guide clearance area.

According to the blow-by gas processing apparatus according to the present invention, the setting unit on which the filter is placed protrudes outward from the surface of the flow velocity increasing operation unit, and guides oil as a space between the surface of the flow velocity increasing operation unit and the filter. Form a gap area. The oil separated from the blanking Robaigasu flows along the surface of the ramped flow rate operation part in the oil guide clearance area. As a result, the oil separated from the blow-by gas is more reliably suppressed from staying on the surface of the flow velocity increasing operation unit, and the oil separated from the blow-by gas is formed between the surface of the flow velocity increasing operation unit and the filter. The oil is guided more reliably from the oil guide gap area toward the oil guide.

In the blow-by gas processing apparatus according to the present invention, preferably, the flow rate rise operation unit, passed through the blow-by gas having a hole aperture supplied to the collision plate, the axis of the throttle hole is in the vertical direction It is characterized in that it extends along an inclined direction and is orthogonal to the inner surface of the collision plate.
According to the blow-by gas processing apparatus according to the present invention, the flow velocity increasing operation unit has a throttle hole through which the blow-by gas is passed and supplied to the filter. The axis of the diaphragm hole is orthogonal to the inner surface of the collision plate. Therefore, the blow-by gas that has passed through the throttle hole of the flow velocity increase operation unit and whose flow velocity has increased collides perpendicularly with the inner surface of the collision plate. As a result, the blow-by gas receives a stronger impact force from the collision plate and is surely separated from the oil and the gas. Since the axis of the throttle hole extends along a direction inclined with respect to the vertical direction, the oil separated from the blow-by gas in the collision plate is different from the flow direction of the blow-by gas that collides with the inner surface of the collision plate. It falls on the surface of the flow velocity increase operation unit in a different direction (that is, in the vertical direction). Therefore, it is possible to prevent the oil separated from the blow-by gas in the collision plate from entering the throttle hole and to prevent the throttle hole from being closed. As a result, the operation of colliding the blow-by gas with the collision plate and separating the oil and the gas is performed more reliably.

Oite the blow-by gas processing apparatus according to the present invention, preferably, the flow rate rise operation unit includes a plurality of the throttle hole, the plurality of throttle holes, in a direction crossing the inclination direction of the surface The feature is that they are arranged at positions offset from each other.
According to the blow-by gas processing apparatus according to the present invention, the oil guided to the oil guide portion along the inclination direction of the surface of the flow velocity increasing operation portion enters, for example, the throttle holes arranged on the downstream side among the plurality of throttle holes. It is possible to suppress this and prevent the throttle hole on the downstream side from being blocked. As a result, the operation of colliding the blow-by gas with the collision plate and separating the oil and the gas is performed more reliably.

The blow-by gas treatment device according to the present invention is preferably provided on the side opposite to the oil outlet inclined guide portion when viewed from the oil guide portion, and the oil outlet inclined guide portion is provided from the lowermost portion of the oil outlet inclined guide portion. It is characterized by further including an oil tilt guide return portion formed by tilting so as to have a slope opposite to the slope.

According to the blow-by gas processing apparatus according to the present invention, an oil tilt guide return portion is further provided. The oil tilt guide return portion is provided on the side opposite to the oil outlet tilt guide portion when viewed from the oil guide portion. Further, the oil tilt guide return portion is formed so as to have a slope opposite to the slope of the oil outlet tilt guide portion from the lowermost portion of the oil outlet tilt guide portion. Therefore, oil inclined guide return unit, when the oil separated from the blanking Robaigasu has flowed through the oil outlet inclined guide portion from the surface of the flow rate rise operation unit, the oil outlet inclined guide by force when the oil is flowing Oil can be temporarily stored by suppressing the outflow from the section and the oil guide section. Then, the oil tilt guide return unit can guide the oil back to the oil guide unit.

In the blow-by gas processing apparatus according to the present invention, preferably, the length of the oil tilt guide return portion is longer than the length of the oil outlet tilt guide portion in the direction in which the oil guide portion is extended. ..

According to the blow-by gas processing apparatus according to the present invention, the oil separated from the blanking Robaigasu is also flowed from the surface of the ramped flow rate operation part through the oil outlet inclined guide portion, the oil inclined guide return portion has flowed While suppressing the overflow of oil, it is possible to store the oil with a margin and then flush it back to the oil guide.

Further, the subject is an engine including a blow-by gas processing device for processing blow-by gas generated in the engine, and the blow-by gas processing device increases the flow velocity of the blow-by gas along a direction inclined with respect to the vertical direction. An operation unit for increasing the flow velocity, a collision plate for colliding the blow-by gas whose flow velocity has increased by the operation unit for increasing the flow velocity to separate it into oil and gas, and the oil separated from the blow-by gas into the engine. The surface is connected to the oil guide portion that guides toward the oil guide portion, the surface of the flow velocity increasing operation portion that faces the collision plate, and the oil guide portion, and is inclined downward from the surface toward the oil guide portion. It has an oil outlet inclined guide portion that guides the oil flowing along the oil to the oil guide portion, and the surface thereof is inclined downward toward the oil guide portion so as to the horizontal plane of the oil outlet inclined guide portion. The tilt angle is solved by the engine according to the present invention, which is characterized in that the tilt angle is larger than the tilt angle of the surface with respect to the horizontal plane.

According to the engine according to the present invention, the flow velocity increasing operation unit of the blow-by gas processing device collides the blow-by gas with the collision plate while increasing the flow velocity of the blow-by gas along the direction inclined with respect to the vertical direction (vertical direction). Let me. This ensures that the blow-by gas is separated into oil and gas. Then, the oil separated from the blow-by gas in the collision plate falls on the surface of the flow velocity increasing operation unit facing the collision plate. Here, the surface of the flow velocity increasing operation portion is inclined downward toward the oil guide portion. Therefore, the oil that has fallen on the surface of the flow velocity increasing operation unit flows on the surface of the flow velocity increasing operation unit by its own weight and is guided to the oil guide unit. Thereby, the engine according to the present invention can suppress the retention of the oil contained in the blow-by gas and the freezing of the water contained in the oil at a low temperature. Thus, the operation for separating the blanking Robaigasu in the oil and gas is performed more reliably.
Further, the oil outlet inclination guide portion of the blow-by gas treatment device is connected to the surface of the flow velocity increase operation unit and the oil guide portion, and is inclined downward from the surface of the flow velocity increase operation unit toward the oil guide portion. Then, the oil outlet inclination guide portion guides the oil flowing along the surface of the flow velocity increase operation portion to the oil guide portion. Here, the inclination angle of the oil outlet inclination guide portion with respect to the horizontal plane is larger than the inclination angle of the surface of the flow velocity increasing operation portion with respect to the horizontal plane. As a result, the oil outlet inclined guide portion can quickly guide the oil separated from the blow-by gas and flowing along the surface of the flow velocity increasing operation portion to the oil guide portion. Further, it is possible to prevent the oil from staying in the vicinity of the surface of the flow velocity increasing operation portion, and to prevent the oil separated from the blow-by gas from being mixed into the blow-by gas again.

According to the present invention, a blow-by gas treatment device and a blow-by gas that can suppress the retention of oil when the blow-by gas is separated into oil and gas and prevent the oil from freezing at a low temperature. An engine equipped with a processing device can be provided.

It is sectional drawing which shows the engine which includes the blow-by gas processing apparatus which concerns on embodiment of this invention. It is sectional drawing in the XZ plane which shows the structural example of the blow-by gas processing apparatus which concerns on this embodiment. It is a perspective view which shows the structural example of the separation part of the blow-by gas processing apparatus which concerns on this embodiment, and the peripheral area thereof. FIG. 3 is a cross-sectional view taken along the line DD along the Y direction of the separated portion of the blow-by gas processing apparatus according to the present embodiment shown in FIG. 3 and the peripheral region thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
Since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are added, but the scope of the present invention is particularly limited to the present invention in the following description. Unless otherwise stated, the present invention is not limited to these aspects. Further, in each drawing, the same components are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.

(Overview of Engine 1)
FIG. 1 is a cross-sectional view showing an engine including a blow-by gas processing apparatus according to an embodiment of the present invention.
The engine 1 shown in FIG. 1 is an internal combustion engine, for example, an industrial diesel engine. The engine 1 is a multi-cylinder engine such as a supercharged high-output 3-cylinder engine or a 4-cylinder engine equipped with a turbocharger. The engine 1 is mounted on a vehicle such as a construction machine, an agricultural machine, or a lawn mower.

(Structural example of engine 1)
The engine 1 includes a cylinder block 2, a cylinder head 3, a head cover 4, an oil pan 7, and a blow-by gas processing device 100. The cylinder head 3 is assembled on the cylinder block 2. The head cover 4 is assembled on the cylinder head 3. The cylinder block 2 has an upper cylinder 5 and a lower crankcase 6. The oil pan 7 is arranged at the lower part of the crankcase 6. The piston 8 is arranged in the cylinder 5. The crankshaft 9 is arranged in the crankcase 6. The piston 8 is connected to the crank shaft 9 via a connecting rod 10.

As shown in FIG. 1, the cylinder 5 has a valve drive cam chamber 11. The valve drive cam shaft 12 is housed in the valve drive cam chamber 11. The tappet 13 can move up and down along the tappet guide hole 14. The lower part of the tappet 13 rests on the valve camshaft 12. The push rod 15 passes through the insertion hole 16. The rocker arm 17 is arranged in the head cover 4. The upper end of the push rod 15 is in contact with the rocker arm 17.

The rocker arm 17 is urged toward the upper end of the push rod 15 by a spring 18. The intake valve 19 and the exhaust valve 20 move up and down by the power transmitted via the push rod 15 and the rocker arm 17 by rotating the valve camshaft 12, and open and close the intake port and the exhaust port, respectively. ..

As shown in FIG. 1, for example, an oil outflow hole 21 is provided in the tappet 13. An oil drop hole 22 is provided from the valve cam chamber 11 to the crankcase 6. As a result, the insertion hole 16, the inside of the tappet 13, the oil outflow hole 21, the valve cam chamber 11, and the oil drop hole 22 form an oil return path 99. The oil return path 99 can return the oil in the head cover 4 to the oil pan 7 through the inside of the crankcase 6. Each cylinder of the cylinder head 3 is connected to an intake passage 30 and an exhaust passage 31.

As shown in FIG. 1, blow-by gas BG may be generated in at least one of the compression stroke and the combustion stroke of the engine 1. The blow-by gas BG is a gas that flows into the crankcase 6 through the gap between the piston 8 and the cylinder 5 shown in FIG. 1, and includes unburned fuel components, burned gas components, and mist of oil and the like. There is. The blow-by gas BG leaking from the gap between the cylinder 5 and the piston 8 to the crankcase 6 rises into the head cover 4 through, for example, the oil return path 99 described above. That is, when the blow-by gas BG leaks into the crankcase 6 from the gap between the cylinder 5 and the piston 8, for example, the oil drop hole 22 of the oil return path 99 as the blow-by gas passage path, the valve cam chamber 11, and the tappet. It penetrates into the head cover 4 through the oil outflow hole 21 of the 13 and the insertion hole 16. The oil return path 99 described above is an example of a blow-by gas passage path. The blow-by gas passage route is not limited to the oil return route 99 described above.

As shown in FIG. 1, a blow-by gas processing device 100 is provided in the head cover 4. The blow-by gas processing apparatus 100 has a role of separating the blow-by gas BG into an oil OL (see FIG. 2) and a gas (treated gas) G (see FIG. 2) from which the mist of the oil OL is separated. For example, the gas G contained in the blow-by gas BG is sent to the pipe 41 connected to the external intake system of the head cover 4 via the blow-by gas processing device 100. The gas G contained in the blow-by gas BG is, for example, an unburned gas component or a combustion gas component obtained by removing the oil OL and the mist of the oil OL from the blow-by gas BG. The oil (lubricant component) OL is collected in the oil pan 7 through, for example, the head cover 4, the cylinder head 3, and the oil return path 99.

The connection pipe 50T and the pipe 41 of the intake pipe 50 shown in FIG. 1 are connected to each other by a blow-by gas mixing joint 70. When the new intake AR is sucked into the intake pipe 50, it passes through the air cleaner 52 and the connecting pipe 50T and enters the main pipe 71 of the blow-by gas mixing joint 70. On the other hand, the gas G after the oil OL is separated from the blow-by gas BG by the blow-by gas processing device 100 enters the sub-pipe 72 of the blow-by gas mixing joint 70 from the outlet portion 40 of the blow-by gas processing device 100 through the pipe 41. As a result, the new intake AR and the gas G are mixed in the blow-by gas mixing joint 70 to become the intake air B.

On the other hand, the exhaust gas from the exhaust passage 31 is supplied to the turbine 62 of the turbocharger 60 to rotate the turbine 62 and the blower 61 at high speed. The mixed intake air B is supplied to the blower 61 of the turbocharger 60 and compressed. The compressed intake air C is supercharged to the intake passage 30 of the intake system.

(Blow-by gas processing device 100)
Next, a preferable structural example of the blow-by gas treatment apparatus 100 shown in FIG. 1 will be described with reference to FIGS. 2 to 4.
FIG. 2 is a cross-sectional view taken along the XX plane showing a structural example of the blow-by gas processing apparatus according to the present embodiment.
FIG. 3 is a perspective view showing a structural example of a separated portion of the blow-by gas processing apparatus according to the present embodiment and a peripheral region thereof.
FIG. 4 is a cross-sectional view taken along the line DD along the Y direction of the separated portion of the blow-by gas processing apparatus according to the present embodiment shown in FIG. 3 and the peripheral region thereof.

Here, the X direction shown in FIGS. 1 to 4 is the front-rear direction of the engine 1 shown in FIG. 1, that is, the axial direction of the crank shaft 9. The Y direction is the left-right direction of the engine 1. The Z direction is the vertical direction of the engine 1. The X, Y, and Z directions are orthogonal to each other.

As shown in FIGS. 1 and 2, the blow-by gas processing device 100, also referred to as a breather device or a bleeder, is arranged in the head cover 4. As shown in FIG. 2, the blow-by gas processing apparatus 100 can separate the blow-by gas BG into an oil OL and a gas G, and guide the oil OL and the gas G by different routes.

The blow-by gas processing apparatus 100 shown in FIG. 2 has a main structural portion 101 and an outlet portion 40. The main structural portion 101 is provided in the head cover 4. The outlet portion 40 is provided so as to project above the head cover 4. Moreover, as shown in FIG. 2, the outlet portion 40 is arranged, for example, at a position CP at a substantially central position with respect to the front-rear direction, which is the X direction of the main structural portion 101. The outlet portion 40 adjusts the pressure of the gas G to be supplied to the intake system of the engine 1 at the position CP at the substantially center of the engine 1, for example, and uses only the gas G derived from the main structural portion 101 as the engine. It is sent to the pipe 41 of the intake system of 1. The outlet portion 40 is provided with, for example, a pressure regulating valve (diaphragm). The pressure regulating valve provided at the outlet portion 40 suppresses the new intake AR from flowing into the engine 1 through the blow-by gas mixing joint 70 and the intake system pipe 41 shown in FIG.

<Main structural part 101 of blow-by gas processing apparatus 100>
First, a preferable structural example of the main structural portion 101 of the blow-by gas treatment apparatus 100 will be described with reference to FIGS. 1 and 2.
As shown in FIGS. 1 and 2, the main structural portion 101 is housed in the head cover 4. Specifically, the head cover 4 has an upper surface portion 4A, a front surface portion 4B, a rear surface portion 4C, and left and right surface portions 4D. The main structural portion 101 is arranged in a space surrounded by the upper surface portion 4A, the front surface portion 4B, the rear surface portion 4C, and the left and right surface portions 4D. As shown in FIG. 2, the main structural portion 101 takes in and guides the blow-by gas BG, and separates the oil OL and the gas G contained in the blow-by gas BG from the blow-by gas BG. Then, the main structural portion 101 guides the oil OL and the gas G by separate routes so that the oil OL and the gas G separated from the blow-by gas BG do not leak to the outside of the engine 1. Therefore, the head cover 4 is held by the cylinder head 3 in a state where the inside of the head cover 4 is kept airtight with respect to the outside of the head cover 4. As a result, the blow-by gas BG and the oil OL and the gas G separated from the blow-by gas BG are suppressed from leaking to the outside of the engine 1.

As shown in FIG. 2, the main structural portion 101 generally includes a first blow-by gas intake portion 111, a second blow-by gas intake portion 112, a separation portion 330, a first oil guide groove portion 151, and a first portion. 2 It has an oil guide groove portion 152, a first oil drain 161 and a second oil drain 162. Each of the first oil guide groove portion 151 and the second oil guide groove portion 152 is an example of the "oil guide portion" of the present invention.

As shown in FIG. 2, the main structural portion 101 includes a partition wall portion 200, a guide wall portion 203, and a guide plate 295 in order to form the above-mentioned components. The partition wall portion 200 is arranged in the XY plane in the head cover 4, that is, horizontally, and partitions the lower region 4P of the head cover 4 and the upper regions 4Q and 4R. Therefore, the lower region 4P and the upper regions 4Q and 4R are spaces that are independent of each other.

As shown in FIG. 2, the guide wall portion 203 reliably guides only the treated gas G, that is, the gas G after separating the oil OL mist from the blow-by gas BG, to the outlet portion 40. The guide wall portion 203 is arranged between the partition wall portion 200 and the upper surface portion 4A of the head cover 4, and partitions the upper region 4Q and the upper region 4R. Therefore, the upper region 4Q and the upper region 4R are spaces that are independent of each other.

<1st blow-by gas intake section 111 and 2nd blow-by gas intake section 112>
Next, the first blow-by gas intake unit 111 and the second blow-by gas intake unit 112 will be described with reference to FIG.
The first blow-by gas intake portion 111 and the second blow-by gas intake portion 112 are holes formed by the partition wall portion 200 and the guide plate 295, and take in the blow-by gas BG. The partition wall portion 200 is divided into a first guide lower surface portion 231 side and a second guide lower surface portion 232 side with the separation portion 330 at the center. The first blow-by gas intake portion 111 is provided at a position closer to the front surface portion 4B (that is, the front side of the engine 1) and takes in the blow-by gas BG from the front side. Further, the second blow-by gas intake portion 112 is provided at a position closer to the rear surface portion 4C (that is, the rear side of the engine 1) and takes in the blow-by gas BG from the rear side.
The guide plate 295 shown in FIG. 2 has a portion separated from the partition wall portion 200 so as to face the first guide lower surface portion 231 and the second guide lower surface portion 232, and is arranged along the XY plane. ing.

As shown in FIG. 1, when the blow-by gas BG that has risen in the crankcase 6 reaches the lower region 4P of the head cover 4 shown in FIG. 2, it passes through the first blow-by gas intake portion 111 and is the second of the partition wall portion 200. 1 It is taken in between the guide lower surface portion 231 and the guide plate 295, and is guided toward the separation portion 330. Alternatively, the blow-by gas BG is taken in between the second guide lower surface portion 232 and the guide plate 295 through the second blow-by gas intake portion 112, and is guided toward the separation portion 330. Then, the blow-by gas BG reaches the impactor 120 of the separation portion 330 at the central position RP with respect to the X direction, which is the front-rear direction, as shown by the arrow shown in FIG.

<Separation unit 330>
Next, a preferable structural example of the separation unit 330 will be described with reference to FIGS. 2 to 4.
The separation unit 330 shown in FIG. 2, also referred to as an impactor type separator, has an impactor 120, a filter 130, and a collision plate 133, and has a first blow-by gas intake unit 111 and a second blow-by gas in the front-rear direction of the engine 1. It is provided between the intake portion 112 and the intake portion 112. More specifically, the separation portion 330 is provided at the central portion, that is, at the central position RP between the first oil drain 161 and the second oil drain 162 in the front-rear direction of the engine 1.

As shown in FIGS. 3 and 4, the separation portion 330 is provided in the partition wall portion 200 of the head cover 4 so as to be tilted by a predetermined inclination angle θ with respect to the horizontal plane along the XY plane. Specifically, the separating portion 330 is provided so as to be inclined in a direction in which the oil OL separated from the blow-by gas BG by the separating portion 330 is guided to the first oil guide groove portion 151 and the second oil guide groove portion 152. More specifically, the upper surface 122 of the impactor 120 is tilted by a predetermined tilt angle θ with respect to the horizontal plane along the XY plane. The upper surface 122 is the surface of the impactor 120 facing the inner surface (that is, the lower surface) of the collision plate 133, and is an example of the “surface” of the present invention. The upper surface 122 of the impactor 120 is inclined downward toward the first oil guide groove portion 151 and the second oil guide groove portion 152. The filter 130 and the collision plate 133 are placed on the setting portions 400 and 400 provided on the upper surface 122 of the impactor 120, tilted at a predetermined tilt angle θ with respect to the horizontal plane, and are fixed detachably. .. The separation portion 330 is provided so as to be inclined so as to be lowered toward the first oil guide groove portion 151 and the second oil guide groove portion 152 side. The inclination angle θ is, for example, about 5 degrees or more and 45 degrees or less. When the inclination angle θ is smaller than 5 degrees, the oil OL separated from the blow-by gas BG by the separation portion 330 is promptly sent to the first oil guide groove portion 151 and the second oil guide groove portion 152 via the oil outlet inclination guide portion 500. It becomes difficult to induce. Further, when the inclination angle θ is larger than 45 degrees, the separated oil OL can be quickly guided to the first oil guide groove portion 151 and the second oil guide groove portion 152 via the oil outlet inclination guide portion 500, while the impactor. The effective opening area of the inlet portion of the throttle hole 121 of the 120 is narrowed, and it becomes difficult to guide the blow-by gas BG to the impactor 120. In particular, when the inclination angle θ is, for example, 60 degrees or more, the effective opening area of the inlet portion of the throttle hole 121 of the impactor 120 becomes particularly narrow. Then, the blow-by gas BG stays at the inlet portion of the throttle hole 121 of the impactor 120, and the risk of freezing the water content in the blow-by gas BG increases.

Next, each component of the separation unit 330 will be described in order with reference to FIGS. 2 to 4.
<Impactor 120 of separation unit 330>
The impactor 120 shown in FIG. 2 has a function of a nozzle or an orifice. As shown in FIG. 4, the impactor 120 preferably has at least two throttle holes 121. The aperture hole 121 is a hole that penetrates the impactor 120. The direction of the axis 121C of the narrowing hole 121 is not along the vertical direction or the vertical direction which is the Z direction, but is inclined with respect to the Z direction by the above-mentioned inclination angle θ. That is, the axis 121C of the aperture hole 121 is orthogonal to the inner surface of the collision plate 133.

The two throttle holes 121 and 121 are, for example, through holes having a circular cross section, and in the examples shown in FIGS. 3 and 4, they are arranged in series along the Y direction as illustrated in FIG. 4 (A). There is. As another example, as illustrated in FIG. 4B, the two diaphragm holes 121 and 121 may be arranged in a staggered manner with respect to the Y direction. In other words, the two diaphragm holes 121 and 121 may be arranged at positions offset from each other in the X direction when viewed along the Y direction. Details of the arrangement of the two diaphragm holes 121 and 121 will be described later. The number of aperture holes 121 set is not limited to two, and may be one or three or more. Further, the cross-sectional shape of the aperture hole 121 is not limited to a circular shape, but may be a triangle, a quadrangle, or the like.

The impactor 120 is a flow velocity increasing operation unit capable of increasing the flow velocity of the blow-by gas BG by passing the blow-by gas BG diagonally upward along the throttle hole 121. The impactor 120 is arranged at the center position RP with respect to the X direction of the partition wall portion 200. As a result, the blow-by gas BG taken in by the first blow-by gas intake unit 111 and the blow-by gas BG taken in by the second blow-by gas intake unit 112 are evenly guided to the impactor 120. The impactor 120 guides the blow-by gas BG to the filter 130 after increasing the flow velocity of the blow-by gas BG flowing into the throttle hole 121.

<Filter 130 of separation unit 330>
As shown in FIGS. 2 and 3, the filter 130 is interchangeably mounted on the partition wall portion 200, that is, on the setting portions 400, 400. The filter 130 is made of a material such as glass wool. However, the material of the filter 130 is not particularly limited. The filter 130 is fixed by mounting screws 139, 139 so as to be sandwiched between the collision plate 133 and the setting portions 400, 400 of the impactor 120. That is, an impactor 120 as a flow velocity increasing operation unit is arranged on the lower surface of the filter 130. A collision plate 133 is arranged on the upper surface of the filter 130. The collision plate 133 is, for example, a metal plate and extends in a direction parallel to the upper surface 122 of the impactor 120. The collision plate 133 has, for example, screw holes 138,138 for passing two mounting screws 139,139.

As shown in FIGS. 3 and 4, the upper surface 122 of the impactor 120 is provided with convex setting portions 400, 400 protruding outward from the upper surface 122 of the impactor 120. The setting units 400 and 400 are portions for inclining the filter 130 and the collision plate 133 downward toward the first oil guide groove portion 151 and the second oil guide groove portion 152, and specifically, the filter 130 and the collision plate. It is a part for fixing the 133 detachably in a state of being tilted at the above-mentioned tilt angle θ. The setting portions 400 and 400 are formed so as to bulge in a circular shape on the upper surface 122 of the impactor 120. The positions of the setting units 400 and 400 correspond to the positions of the screw holes 138 and 138 of the collision plate 133, respectively. Each setting unit 400, 400 is provided so as to be inclined in a direction in which the oil OL separated from the blow-by gas BG is guided to the first oil guide groove portion 151 and the second oil guide groove portion 152 as the oil guide portion.

As shown in FIG. 3, an oil guide gap region 401 is formed between the two setting portions 400 and 400. The oil guide gap region 401 is a space formed between the impactor 120 and the filter 130. That is, the setting units 400 and 400 form the oil guide gap region 401 as a space between the impactor 120 and the filter 130. As shown in FIG. 3, the two throttle holes 121 and 121 are provided so as to penetrate the portion of the impactor 120 in the oil guide gap region 401. The two throttle holes 121 and 121 of the impactor 120 supply the blow-by gas BG to the filter 130 while increasing the flow velocity in the diagonally upward direction. The setting units 400 and 400 are provided with female screw portions 402, respectively. Each mounting screw 139 passes through the screw hole 138 of the collision plate 133 and the filter 130, and is fastened to the female screw portion 402 of the setting portion 400. As a result, the filter 130 is detachably fixed between the collision plate 133 and the setting unit 400.

As illustrated in FIG. 4, the blow-by gas BG flows into the throttle hole 121 of the impactor 120 and rises diagonally in the YZ plane in the direction of the arrow G1, so that the flow velocity increases. The blow-by gas BG having an increased flow velocity is separated into oil OL and gas G by removing foreign matter through the filter 130 and colliding with the lower surface of the collision plate 133.

The gas G separated from the blow-by gas BG by the separation unit 330 is discharged from the filter 130. As described above, the guide wall portion 203 is provided between the partition wall portion 200 and the upper surface portion 4A of the head cover 4. Therefore, the gas G containing no mist of oil OL discharged from the filter 130 is guided by the guide wall portion 203 and guided to the outlet portion 40 through the passage 135 of the upper region 4Q.

On the other hand, the oil OL separated from the blow-by gas BG by the separating portion 330 falls through the filter 130 as shown by the arrow G2 in FIG. 4, and falls on the upper surface 122 of the impactor 120 in the oil guide gap region 401. .. The oil OL that has fallen on the upper surface 122 of the impactor 120 flows along the upper surface 122 of the impactor 120 in the oil guide gap region 401, and flows toward the first oil guide groove portion 151 and the second oil guide groove portion 152.

The separation portion 330 having the above-mentioned structure is located at the central position RP in the X direction shown in FIG. 2, and the blow-by gas BG is assembled from the front side and the rear side of the engine 1 toward the central portion in the X direction. It serves as a gathering part that can be used. As described above, since the separation portion 330 is located at the central position RP with respect to the X direction of the head cover 4, the blow-by gas BG is collected in the central portion from the front side and the rear side with respect to the X direction in the head cover 4, and the oil OL and the oil are collected. It can be separated into a gas G that does not contain OL mist.

<Oil outlet tilt guide 500 and oil tilt guide return 600>
Next, the oil outlet tilt guide portion 500 and the oil tilt guide return portion 600 will be described with reference to FIGS. 3 and 4.
As shown in FIGS. 3 and 4, an oil outlet inclined guide portion 500 is provided between the oil guide gap region 401 and the first oil guide groove portion 151 and the second oil guide groove portion 152. The oil outlet inclined guide portion 500 is connected to the upper surface 122 of the impactor 120 in the oil guide gap region 401, the first oil guide groove portion 151 and the second oil guide groove portion 152, and is connected to the first oil guide from the upper surface 122 of the impactor 120. It is formed so as to be inclined downward toward the groove portion 151 and the second oil guide groove portion 152. That is, the oil outlet tilt guide portion 500 guides the oil OL separated from the blow-by gas BG by the separation portion 330 and flowing along the upper surface 122 of the impactor 120 to the first oil guide groove portion 151 and the second oil guide portion 151 as the oil guide portion. In order to lead to the groove portion 152, the impactor 120 is formed so as to be inclined downward from the upper surface 122 toward the first oil guide groove portion 151 and the second oil guide groove portion 152.

It is desirable that the inclination angle θ1 at which the oil outlet inclination guide portion 500 is inclined with respect to the horizontal plane (XY plane) is larger than the inclination angle θ with respect to the horizontal plane of the upper surface 122 of the impactor 120. When the inclination angle θ1 is larger than the inclination angle θ, the oil OL separated from the blow-by gas BG by the separation portion 330 and flowing down along the upper surface 122 of the impactor 120 is oil when it goes down the oil outlet inclination guide portion 500. The flow velocity of the oil OL is higher than that when the OL flows through the upper surface 122 of the impactor 120. Therefore, the oil OL separated from the blow-by gas BG by the separation portion 330 can be quickly guided from the upper surface 122 of the impactor 120 to the first oil guide groove portion 151 and the second oil guide groove portion 152. Further, since the oil OL is less likely to stay on the upper surface 122 of the impactor 120, it is possible to prevent the oil OL separated from the blow-by gas BG by the separating portion 330 from being mixed into the blow-by gas BG again.

Further, as shown in FIGS. 3 and 4, the oil tilt guide return portion 600 is provided on the side opposite to the oil outlet tilt guide portion 500 when viewed from the first oil guide groove portion 151 and the second oil guide groove portion 152. There is. That is, the oil outlet tilt guide portion 500 is provided on one side of the first oil guide groove portion 151 and the second oil guide groove portion 152 (the side where the separation portion 330 is provided), and the oil tilt guide return portion 600 is the first oil. It is provided on the other side of the guide groove portion 151 and the second oil guide groove portion 152. The oil tilt guide return portion 600 is formed so as to be inclined from the lowermost position of the oil outlet tilt guide portion 500 so as to have a slope opposite to the slope of the oil outlet tilt guide portion 500. That is, as illustrated in FIG. 4, the oil outlet tilt guide portion 500 and the oil tilt guide return portion 600 are formed in a substantially V shape when viewed in cross section. The inclination angle θ2 of the oil inclination guide return portion 600 is not particularly limited, and is set to, for example, an angle equal to or smaller than the inclination angle θ1. The tilt angle θ2 of the oil tilt guide return portion 600 is, for example, about 5 degrees or more and 10 degrees or less. When the tilt angle θ2 of the oil tilt guide return portion 600 is smaller than 5 degrees, the oil OL temporarily stored or pooled in the oil tilt guide return portion 600 is transferred to the first oil guide groove portion 151 and the second oil guide groove portion 152. It becomes difficult to quickly guide to. Further, when the tilt angle θ2 of the oil tilt guide return portion 600 is larger than 10 degrees, the oil OL temporarily stored or pooled in the oil tilt guide return portion 600 is transferred to the first oil guide groove portion 151 and the second oil guide. The speed of guiding to the groove portion 152 may be too fast, and the oil OL may return to the oil outlet inclined guide portion 500 on the opposite side.

The oil tilt guide return unit 600 is used when the oil OL separated from the blow-by gas BG at the separation unit 330 flows from the upper surface 122 of the impactor 120 via the oil outlet tilt guide portion 500. The oil OL is temporarily stored or pooled in order to prevent the oil from flowing out from the oil outlet inclined guide portion 500, the first oil guide groove portion 151, and the second oil guide groove portion 152 due to the momentum. Then, the oil tilt guide return portion 600 guides the oil OL back to the first oil guide groove portion 151 and the second oil guide groove portion 152. In this way, the oil tilt guide return unit 600 temporarily stores the oil OL separated from the blow-by gas BG by the separation unit 330, and guides and returns the oil OL to the first oil guide groove portion 151 and the second oil guide groove portion 152. Has a temporary oil buffering or pooling function for. As shown in FIG. 4, the oil tilt guide return portion 600 is for more reliably suppressing the oil OL from flowing out from the oil outlet tilt guide portion 500, the first oil guide groove portion 151, and the second oil guide groove portion 152. , Has a step 601.

As shown in FIGS. 3 and 4, the bottom portion of the oil outlet tilt guide portion 500 and the bottom portion of the oil tilt guide return portion 600 are connected at the cross connection position S. The cross connection position S extends along the X direction and is located between the first oil guide groove portion 151 and the second oil guide groove portion 152.

Further, as shown in FIG. 3, the width W2 in the X direction of the oil tilt guide return portion 600 is set larger than the width W1 in the X direction of the oil outlet tilt guide portion 500. The width W1 in the X direction and the width W2 in the X direction are examples of the "length" in the "direction in which the oil guide portion is extended" of the present invention. As a result, even if the oil OL separated from the blow-by gas BG by the separation portion 330 flows from the upper surface 122 of the impactor 120 through the oil outlet tilt guide portion 500, the oil tilt guide return portion 600 still flows through the oil OL. After accommodating the oil OL with a margin while suppressing the overflow of the oil, the oil can be returned to the first oil guide groove portion 151 and the second oil guide groove portion 152.

<1st oil guide groove 151 and 2nd oil guide groove 152>
The first oil guide groove portion 151 shown in FIG. 2 has a groove shape, is provided from the front surface portion 4B of the head cover 4 to the vicinity of the filter 130, and is inclined downward from the filter 130 toward the front surface portion 4B of the head cover 4. There is. Similarly, the second oil guide groove portion 152 has a groove shape, is provided from the rear surface portion 4C of the head cover 4 to the vicinity of the filter 130, and is inclined downward from the filter 130 toward the rear surface portion 4C of the head cover 4. There is. The first oil guide groove portion 151 and the second oil guide groove portion 152 guide the oil OL separated from the blow-by gas BG by the separation portion 330. The first oil guide groove portion 151 is a specific structural example of the "first oil guide portion" of the present invention, and the oil OL discharged from the filter 130 is directed to the X1 direction when the engine 1 of FIG. 1 is tilted forward. It can be guided to the front indicated by (1) and guided to the first oil drain 161 on the front side. Similarly, the second oil guide groove portion 152 is a specific structural example of the "second oil guide portion" of the present invention, and the oil OL discharged from the filter 130 is placed on the rear side of the engine 1 in FIG. When it is tilted, it can be guided to the rear indicated in the X2 direction and guided to the second oil drain 162 on the rear side.

The first oil guide groove portion 151 and the second oil guide groove portion 152 are connected to each other via the oil outlet tilt guide portion 500 and the oil tilt guide return portion 600 described above.

<1st oil drain 161 and 2nd oil drain 162>
The first oil drain 161 is provided on the front side of the engine 1 and has a cylindrical shape, for example. The first oil drain 161 is provided in the head cover 4 downward in the Z1 direction at a position in front of the first guide lower surface portion 231 of the partition wall portion 200. The first oil drain 161 has a check valve, temporarily stores the oil OL guided by the first oil guide groove portion 151, and discharges the oil OL into the engine 1. Similarly, the second oil drain 162 is provided on the rear side of the engine 1 and has a cylindrical shape, for example. The second oil drain 162 is provided in the head cover 4 downward in the Z1 direction at a position behind the second guide lower surface portion 232 of the partition wall portion 200. The second oil drain 162 has a check valve, temporarily stores the oil OL guided by the second oil guide groove portion 152, and discharges the oil OL into the engine 1.

As a result, when the engine 1 is tilted to the front side, the oil OL separated from the blow-by gas BG by the separation portion 330 is guided in the X1 direction by the first oil guide groove portion 151, and is temporarily stored in the first oil drain 161. After that, it is discharged in the Z1 direction through the first oil drain 161. Similarly, when the engine 1 is tilted to the rear side, the oil OL separated from the blow-by gas BG by the separation portion 330 is guided in the X2 direction by the second oil guide groove portion 152, and is temporarily provided to the second oil drain 162. After being stored, it is discharged in the Z1 direction through the second oil drain 162. In the head cover 4, the oil OL discharged from the first oil drain 161 and the second oil drain 162 is collected in the oil pan 7 from the head cover 4 shown in FIG. 1 through the above-mentioned oil return path 99, for example. Alternatively, the discharged oil OL can be collected, for example, in an oil container (not shown). As a result, the oil OL discharged from the first oil drain 161 and the second oil drain 162 is discharged into the engine 1 and does not leak to the outside of the engine 1.

(Example of operation of blow-by gas treatment device 100)
Next, an example of the operation of the blow-by gas treatment device 100 in the engine 1 described above will be described with reference to FIGS. 1 to 3.
The blow-by gas BG leaking from between the piston 8 and the cylinder 5 shown in FIG. 1 reaches the lower region 4P of the head cover 4 shown in FIG. The blow-by gas BG passes between the first blow-by gas intake portion 111 and the second blow-by gas intake portion 112, and is between the first guide lower surface portion 231 and the guide plate 295, and the second guide lower surface portion 232 and the guide plate 295. It is taken in between and guided toward the separation part 330. Then, the blow-by gas BG guided toward the separation portion 330 reaches the impactor 120 of the separation portion 330 at the central position RP.

The impactor 120 shown in FIGS. 2 and 4 increases the flow velocity of the blow-by gas BG flowing into the throttle hole 121, and then is tilted at an inclination angle θ along the direction of the axis 121C of the throttle hole 121, that is, FIG. The blow-by gas BG is guided to the filter 130 along the direction of the arrow G1 shown in. The blow-by gas BG having an increased flow rate passes through the filter 130 and collides with the inner surface (that is, the lower surface) of the collision plate 133. At this time, the axis 121C of the throttle hole 121 is orthogonal to the inner surface of the collision plate 133. Therefore, the blow-by gas BG that has passed through the throttle hole 121 and whose flow velocity has increased collides perpendicularly with the inner surface of the collision plate 133. As a result, the blow-by gas BG receives a stronger impact force from the collision plate 133, and is reliably separated from the oil OL and the gas G containing no mist of the oil OL.

As shown in FIG. 2, the gas G separated from the blow-by gas BG by the separation unit 330 is discharged from the filter 130, rises, and is sent to the outlet unit 40 through the passage 135 of the upper region 4Q.

On the other hand, the oil OL separated from the blow-by gas BG by the separation unit 330 falls while passing through the filter 130 along the arrow G2 shown in FIG. 4, and falls on the upper surface 122 of the impactor 120 in the oil guide gap region 401. Fall. In this way, the oil OL separated from the blow-by gas BG in the collision plate 133 is in a direction different from the direction of the flow of the blow-by gas BG colliding with the inner surface of the collision plate 133 (the direction of the arrow G1 shown in FIG. 4). It falls on the upper surface 122 of the impactor 120 in the direction of the arrow G2 shown in FIG. 4 (that is, in the vertical direction). Therefore, it is possible to prevent the oil OL separated from the blow-by gas BG in the collision plate 133 from entering the throttle hole 121 and to prevent the throttle hole 121 from being blocked.

Here, when the surface of the impactor facing the collision plate 133 that separates the blow-by gas BG into the oil OL and the gas G is parallel to the horizontal plane, the oil OL separated from the blow-by gas BG is the impactor. It may stay on the surface. The oil OL separated from the blow-by gas BG contains water (water vapor). Therefore, when the temperature is relatively low, the water contained in the oil OL accumulated on the surface of the impactor may freeze on the surface of the impactor. Then, the through hole formed in the impactor and passing the blow-by gas BG may be blocked. If the through hole of the impactor is closed, there arises a problem that the blow-by gas BG cannot be separated into the oil OL and the gas G.

On the other hand, in the blow-by gas processing apparatus 100 according to the present embodiment, the separation portion 330 is tilted by a predetermined inclination angle θ with respect to the horizontal plane along the XY plane in the partition wall portion 200 of the head cover 4. It is provided. Specifically, the separating portion 330 is provided so as to be inclined in a direction in which the oil OL separated from the blow-by gas BG by the separating portion 330 is guided to the first oil guide groove portion 151 and the second oil guide groove portion 152. More specifically, the upper surface 122 of the impactor 120 is tilted by a predetermined tilt angle θ with respect to the horizontal plane along the XY plane. Therefore, the oil OL that has fallen on the upper surface 122 of the impactor 120 flows by its own weight on the upper surface 122 of the impactor 120 that is inclined at the inclination angle θ, and flows into the oil outlet inclination guide portion 500 that has a larger inclination angle θ1. ..

As a result, the oil OL separated from the blow-by gas BG is reliably guided from the upper surface 122 of the impactor 120 to the oil outlet inclined guide portion 500. Then, even if the oil OL flows vigorously along the oil outlet inclined guide portion 500, it is temporarily stored in the oil inclined guide return portion 600 having a reverse gradient. Therefore, the oil OL does not spill from the oil outlet tilt guide portion 500 and the oil tilt guide return portion 600 to areas other than the oil outlet tilt guide portion 500 and the oil tilt guide return portion 600, and the oil outlet tilt guide It can flow from the portion 500 and the oil tilt guide return portion 600 to at least one of the first oil guide groove portion 151 and the second oil guide groove portion 152.

Moreover, the width W2 in the X direction of the oil tilt guide return portion 600 is set larger than the width W1 in the X direction of the oil outlet tilt guide portion 500. As a result, even if the oil OL separated from the blow-by gas BG by the separation portion 330 flows from the upper surface 122 of the impactor 120 through the oil outlet tilt guide portion 500, the oil tilt guide return portion 600 still flows through the oil OL. After accommodating the oil OL with a margin while suppressing the overflow of the oil, the oil can be returned to the first oil guide groove portion 151 and the second oil guide groove portion 152.

As described above with respect to FIG. 4B, the two diaphragm holes 121 and 121 may be arranged at positions displaced from each other in the X direction when viewed along the Y direction. In other words, even if they are arranged at positions deviated from each other in the inclination direction of the upper surface 122 of the impactor 120, that is, the direction intersecting the flow direction of the oil OL flowing through the upper surface 122 of the impactor 120 (X direction in this embodiment). good. According to this, the oil OL flowing from the upper surface 122 of the impactor 120 toward the oil outlet inclination guide portion 500 enters the throttle hole 121 arranged on the downstream side of the two throttle holes 121, 121, and the throttle hole on the downstream side. It is possible to suppress blocking 121. As a result, the operation of colliding the blow-by gas BG with the collision plate 133 and separating the oil OL and the gas G is more reliably executed.

In FIG. 2, the oil OL separated from the blow-by gas BG by the separation portion 330 is discharged from the filter 130 when the engine 1 is tilted to the front side, and is guided forward by the first oil guide groove portion 151 in the X1 direction. It is guided to the first oil drain 161 on the front side. Similarly, the oil OL separated from the blow-by gas BG by the separation portion 330 is discharged from the filter 130 when the engine 1 is tilted to the rear side, and is discharged to the rear indicated by the second oil guide groove portion 152 in the X2 direction. It is guided to the second oil drain 162 on the rear side.

The oil OL guided to the first oil drain 161 by the first oil guide groove portion 151 is temporarily stored in the first oil drain 161 and then in the engine 1 through a check valve provided in the first oil drain 161. Is discharged to. Similarly, the oil OL guided to the second oil drain 162 by the second oil guide groove portion 152 is temporarily stored in the second oil drain 162 and then a check valve provided in the second oil drain 162. It is discharged into the engine 1 through. The oil OL discharged from the first oil drain 161 and the second oil drain 162 is collected in the oil pan 7 from the inside of the head cover 4, for example, through the oil return path 99.

According to the blow-by gas processing apparatus 100 and the engine 1 according to the present embodiment, the separation unit 330 transfers the oil OL separated from the blow-by gas BG by the separation unit 330 to the first oil guide groove portion 151 and the second oil guide groove portion 152. It is provided at an angle in the guiding direction. Therefore, the oil OL separated from the blow-by gas BG by the separation unit 330 does not stay in the separation unit 330 and is guided to the first oil guide groove portion 151 and the second oil guide groove portion 152. As a result, the blow-by gas treatment apparatus 100 according to the present embodiment can suppress the retention of the oil OL contained in the blow-by gas BG and suppress the freezing of the water contained in the oil OL at a low temperature. .. As a result, the operation of separating the blow-by gas BG into the oil OL and the gas G by the separation unit 330 is more reliably executed.

Further, the impactor 120 causes the blow-by gas BG to collide with the collision plate 133 while increasing the flow velocity of the blow-by gas BG along a direction inclined with respect to the vertical direction (vertical direction). As a result, the blow-by gas BG is surely separated into the oil OL and the gas G. Then, the oil OL separated from the blow-by gas BG in the collision plate 133 passes through the filter 130 and falls on the upper surface 122 of the impactor 120 facing the collision plate 133. Here, the upper surface 122 of the impactor 120 is inclined downward toward the first oil guide groove portion 151 and the second oil guide groove portion 152. Therefore, the oil OL that has fallen on the upper surface 122 of the impactor 120 flows through the upper surface 122 of the impactor 120 by its own weight and is guided to the first oil guide groove portion 151 and the second oil guide groove portion 152. As a result, the blow-by gas treatment apparatus 100 according to the present embodiment more reliably suppresses the retention of the oil OL contained in the blow-by gas BG, and further prevents the water contained in the oil OL from freezing at a low temperature. It can be surely suppressed.

Further, the setting unit 400 on which the filter 130 is placed projects outward from the upper surface 122 of the impactor 120, and forms an oil guide gap region 401 as a space between the impactor 120 and the filter 130. Then, the oil OL separated from the blow-by gas BG by the separation unit 330 flows along the upper surface 122 of the impactor 120 in the oil guide gap region 401. As a result, the oil OL separated from the blow-by gas BG is more reliably suppressed from staying on the upper surface 122 of the impactor 120, and the oil OL separated from the blow-by gas BG is formed between the impactor 120 and the filter 130. It is more reliably guided from the oil guide gap region 401 toward the first oil guide groove portion 151 and the second oil guide groove portion 152.

Further, the inclination angle θ1 of the oil outlet inclination guide portion 500 with respect to the horizontal plane is larger than the inclination angle θ1 of the upper surface 122 of the impactor 120 with respect to the horizontal plane. As a result, the oil outlet tilt guide portion 500 promptly transfers the oil OL separated from the blow-by gas BG by the separation portion 330 and flowing along the upper surface 122 of the impactor 120 to the first oil guide groove portion 151 and the second oil guide groove portion 152. Can lead to. Further, it is possible to prevent the oil OL from staying in the vicinity of the upper surface 122 of the impactor 120, and to prevent the oil OL separated from the blow-by gas BG by the separation unit 330 from being mixed into the blow-by gas BG again.

Further, according to the engine 1 including the blow-by gas treatment device 100 and the blow-by gas treatment device 100 according to the present embodiment, the oil OL separated from the blow-by gas BG by the separation unit 330 is the engine 1 by the first oil guide groove portion 151. It is guided to the front side of the engine, temporarily stored in the first oil drain 161 and then discharged into the engine 1. Further, the oil OL separated from the blow-by gas BG by the separation unit 330 is guided to the rear side of the engine 1 by the second oil guide groove portion 152, temporarily stored in the second oil drain 162, and then in the engine 1. Is discharged to. Therefore, in the blow-by gas treatment apparatus 100 according to the present embodiment, the discharge route of the oil OL separated from the blow-by gas BG by the separation unit 330 is clear. Further, the gas G after the oil OL is separated from the blow-by gas BG is guided to the outlet portion 40 of the blow-by gas processing device 100 by the main structural portion 101. Then, the outlet portion 40 of the blow-by gas processing device 100 supplies the gas G guided by the main structural portion 101 to the intake system of the engine 1. As described above, in the blow-by gas treatment apparatus 100 according to the present embodiment, the discharge path of the oil OL separated from the blow-by gas BG by the separation unit 330 and the discharge path of the gas G separated from the blow-by gas BG by the separation unit 330. And are clearly distinguished. As a result, even if the engine 1 is tilted in the front-rear direction, it is possible to prevent the oil OL separated from the blow-by gas BG from being discharged from the outlet portion 40. Further, since the oil OL mist can be suppressed from flowing to the intake system, the oil OL mist can be suppressed from burning, and the exhaust gas can be purified.

Further, the separation unit 330 that separates the blow-by gas BG into the oil OL and the gas G temporarily stores the oil OL guided by the first oil guide groove portion 151 and discharges the oil OL into the engine 1 first oil drain 161. And the second oil drain 162 that temporarily stores the oil OL guided by the second oil guide groove portion 152 and discharges it into the engine 1, and is provided in the central portion, that is, at the central position RP. As described above, the separating portion 330 is provided at a position relatively far from the first oil drain 161 and the second oil drain 162. Therefore, even if the engine 1 is tilted in the front-rear direction, it exists above the oil OL temporarily stored in the first oil drain 161 and the second oil drain 162, and above the first oil drain 161 and the second oil drain 162. It is possible to prevent the oil OL and the mist of the oil OL from being caught in or remixed with the gas G separated from the blow-by gas BG by the separation unit 330. As a result, even if the engine 1 is tilted in the front-rear direction, it is possible to further suppress the oil OL separated from the blow-by gas BG from being discharged from the outlet portion 40.

Further, since it is possible to prevent the oil OL and the mist of the oil OL from being caught in or remixed with the gas G separated from the blow-by gas BG by the separation portion 330, the position of the outlet portion 40 does not matter. It is possible to suppress the oil OL separated from the blow-by gas BG from being released from the outlet portion 40. This makes it possible to increase the degree of freedom in selecting the installation position and installation direction of the outlet portion 40.

The first oil guide groove portion 151 and the second oil guide groove portion 152 have a groove shape, and although they have a simple structure, they are separated from the blow-by gas BG by the separation portion 330 even if the engine 1 is tilted in the front-rear direction. The oil OL can be reliably guided to the front side and the rear side of the engine 1.

Further, according to the blow-by gas processing apparatus 100 according to the present embodiment, the first blow-by gas intake unit 111 and the second blow-by gas intake unit 112 for taking in the blow-by gas BG, the first oil guide groove portion 151 for guiding the oil OL, and the first oil guide groove portion 151 The second oil guide groove portion 152 and the second oil guide groove portion 152 are provided separately at positions on both sides of the upper surface side and the lower surface side via a common partition wall portion 200. Therefore, the first blow-by gas intake portion 111 and the second blow-by gas intake portion 112, and the first oil guide groove portion 151 and the second oil guide groove portion 152 can be provided on the partition wall portion 200 as one member. Therefore, the vertical dimension V (see FIG. 2) of the blow-by gas processing apparatus 100 can be suppressed. Therefore, the height dimension of the head cover 4 in which the blow-by gas treatment device 100 is arranged can be suppressed, and the height dimension of the engine 1 provided with the blow-by gas treatment device 100 in the head cover 4 can be suppressed.

Further, the blow-by gas BG passes through the filter 130 and collides with the collision plate 133 after increasing the flow velocity by the impactor 120. Therefore, the blow-by gas BG is surely separated by the oil OL and the gas G excluding the mist of the oil OL. Further, the impactor 120 increases the flow velocity of the blow-by gas BG along a direction inclined with respect to the vertical direction (vertical direction) at the central position RP in the front-rear direction of the engine 1. Further, the collision plate 133 extends in a substantially horizontal direction and collides with the blow-by gas BG that has passed through the filter 130. Therefore, the vertical dimension V of the blow-by gas processing device 100 is suppressed as compared with the case where the impactor increases the flow velocity of the blow-by gas along the horizontal direction and causes the blow-by gas to collide with the collision plate extending in the vertical direction. Can be done.

The embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of claims. The configuration of the above embodiment may be partially omitted or may be arbitrarily combined so as to be different from the above.

For example, as an example of the engine of the present invention, the engine 1 according to the present embodiment is illustrated. The engine 1 is a supercharged diesel engine with a turbocharger. However, the present invention is not limited to this, and the engine of the present invention may be a naturally aspirated diesel engine, a supercharged gasoline engine with a turbocharger, a naturally aspirated gasoline engine, or the like. The type of the engine 1 shown in the figure is, for example, a multi-cylinder engine such as a supercharged high-output 3-cylinder engine or a 4-cylinder engine equipped with a turbocharger. However, the type of engine 1 is not limited to this. The engine 1 can be mounted on a type of vehicle other than a vehicle such as a construction machine, an agricultural machine, or a lawn mower. Further, in the description of the present embodiment, the first oil guide groove portion 151 is exemplified as the first oil guide portion, and the second oil guide groove portion 152 is exemplified as the second oil guide portion. However, the first oil guide unit and the second oil guide unit are not limited to this, and may be, for example, a pipe-shaped member.

1: Engine, 2: Cylinder block, 3: Cylinder head, 4: Head cover, 4A: Top surface, 4B: Front surface, 4C: Rear surface, 4D: Left and right surface, 4P: Lower area, 4Q, 4R: Upper area, 5: Cylinder, 6: Crankcase, 7: Oil pan, 8: Piston, 9: Crank shaft, 10: Conrod, 11: Valve cam chamber, 12: Valve cam shaft, 13: Tappet, 14: Tappet guide hole , 15: Push rod, 16: Insertion hole, 17: Rocker arm, 18: Spring, 19: Intake valve, 20: Exhaust valve, 21: Oil outflow hole, 22: Oil drop hole, 30: Intake passage, 31: Exhaust Passage, 40: Outlet, 41: Pipe, 50: Intake pipe, 50T: Connection pipe, 52: Air cleaner, 60: Turbocharger, 61: Blower, 62: Turbine, 70: Blow-by gas mixing joint, 71: Main pipe, 72: Sub-cylinder, 99: Oil return path, 100: Blow-by gas treatment device, 101: Main structural part, 111: First blow-by gas intake part, 112: Second blow-by gas intake part, 120: Impactor, 121: Squeezing hole , 121C: Shaft, 122: Top surface, 130: Filter, 133: Collision plate, 135: Passage, 138: Screw hole, 139: Screw, 151: 1st oil guide groove, 152: 2nd oil guide groove, 161: 1st 1 oil drain, 162: 2nd oil drain, 200: partition wall part, 203: guide wall part, 231: 1st guide lower surface part, 232: 2nd guide lower surface part, 295: guide plate, 330: separation part, 400 : Setting part, 401: Oil guide gap area, 402: Female screw part, 500: Oil outlet tilt guide part, 600: Oil tilt guide return part, 601: Step, AR: Intake, B: Intake air, BG: Blow-by gas, C: Intake air, G: Gas, OL: Oil, RP: Central position, S: Crossed connection position, θ, θ1, θ2: Tilt angle,

Claims (9)

A blow-by gas processing device that processes blow-by gas generated in an engine.
A flow velocity increasing operation unit that increases the flow velocity of the blow-by gas along a direction inclined with respect to the vertical direction.
A collision plate that separates oil and gas by colliding the blow-by gas whose flow velocity has increased by the flow velocity increase operation unit.
An oil guide portion for the oil separated from the previous SL blow-by gas toward the inside of the engine guide,
The oil that is connected to the surface of the flow velocity increasing operation portion facing the collision plate and the oil guide portion and is inclined downward from the surface toward the oil guide portion and flows along the surface is said. The oil outlet tilt guide that leads to the oil guide and the oil outlet tilt guide
Equipped with
The surface is inclined downward toward the oil guide portion, and the surface is inclined downward.
A blow-by gas treatment apparatus characterized in that the inclination angle of the oil outlet inclination guide portion with respect to the horizontal plane is larger than the inclination angle of the surface with respect to the horizontal plane. The blow-by gas processing apparatus according to claim 1, further comprising a filter provided between the flow velocity increasing operation unit and the collision plate to pass the blow-by gas. The blow-by gas according to claim 2, wherein the filter and the collision plate are placed, and a setting unit for inclining the filter and the collision plate downward toward the oil guide portion is further provided . Processing equipment. The setting unit includes, from front Symbol surface outwardly protruding to form an oil guide clearance area as a space between said surface filter,
The oil separated from the previous SL blowby gas, the blow-by gas processing device according to claim 3, characterized in that flows along the front Symbol surface that put in the oil guide clearance area. Before SL ramped flow rate operation part is passed through the blow-by gas having a throttle hole to be supplied to the collision plate,
The aspect according to any one of claims 1 to 4, wherein the axis of the throttle hole extends along a direction inclined with respect to the vertical direction and is orthogonal to the inner surface of the collision plate. Blow-by gas processing equipment. The flow velocity increasing operation unit has a plurality of the throttle holes.
The plurality of aperture holes, blow-by gas processing device according to claim 5, characterized in that arranged at positions shifted from each other in a direction crossing the inclination direction of the surface. It is provided on the side opposite to the oil outlet tilt guide portion when viewed from the oil guide portion, and is formed so as to have a slope opposite to the slope of the oil outlet tilt guide portion from the lowest part of the oil outlet tilt guide portion. The blow-by gas treatment apparatus according to any one of claims 1 to 6, further comprising an oil tilt guide return portion. The blow-by gas treatment apparatus according to claim 7, wherein the length of the oil tilt guide return portion is longer than the length of the oil outlet tilt guide portion in the direction in which the oil guide portion is extended. An engine equipped with a blow-by gas processing device that processes blow-by gas generated in the engine.
The blow-by gas treatment device is
A flow velocity increasing operation unit that increases the flow velocity of the blow-by gas along a direction inclined with respect to the vertical direction.
A collision plate that separates oil and gas by colliding the blow-by gas whose flow velocity has increased by the flow velocity increase operation unit.
An oil guide unit that guides the oil separated from the blow-by gas toward the inside of the engine.
The oil that is connected to the surface of the flow velocity increasing operation portion facing the collision plate and the oil guide portion and is inclined downward from the surface toward the oil guide portion and flows along the surface is said. The oil outlet tilt guide that leads to the oil guide and the oil outlet tilt guide
Have,
The surface is inclined downward toward the oil guide portion, and the surface is inclined downward.
An engine characterized in that the inclination angle of the oil outlet inclination guide portion with respect to the horizontal plane is larger than the inclination angle of the surface with respect to the horizontal plane.

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