JP2022056070A - Blow-by gas treatment device and engine including blow-by gas treatment device - Google Patents

Abstract

To provide a blow-by gas treatment device capable of more securely suppressing freezing and condensation of steam included in gas separated from blow-by gas, and an engine including the blow-by gas treatment device.SOLUTION: A blow-by gas treatment device includes: a mixing joint 70 having main piping 71 for introducing fresh intake air and auxiliary piping 72 for introducing gas obtained by separating blow-by gas into oil and gas to the main piping 71; and a cooling water flow passage 400 guiding cooling water in the engine 1 to transfer heat to gas flowing in the auxiliary piping 72. The cooling water flow passage 400 is disposed at a position avoiding cooling air WD generated by a cooling fan 372 of the engine 1.SELECTED DRAWING: Figure 3

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 separate blow-by gas into oil and gas and supply the gas to the intake system of the engine.

A blow-by gas processing device that separates the blow-by gas generated in the engine into oil and gas such as unburned gas and supplies the gas separated from the blow-by gas to the intake system of the engine is provided, for example, in the head cover of a diesel engine. There is. The gas separated from the blow-by gas is sent to the mixing joint through a pipe and mixed with the new intake air in the mixing joint. After that, the gas mixed with each other and the new intake air are supplied to the intake system of the engine.

This type of mixed fitting is provided exposed to the outside of the engine rather than inside the engine head cover. On the other hand, the gas separated from the blow-by gas contains water vapor. Therefore, when the engine is placed in a low temperature state, the water vapor contained in the gas separated from the blow-by gas may freeze or condense in the mixed joint.

Then, the gas path from the mixing joint to the intake system of the engine may be blocked by the frozen or condensed water. When the gas path is blocked, the internal pressure of the engine rises, and there is a risk that parts such as the oil gauge guide provided in the crankcase will be damaged. Further, if the gas path is blocked, the internal pressure of the engine rises, and the turbocharger may suck oil from the inside of the head cover.

On the other hand, Patent Document 1 discloses a gas recirculation device equipped with a heating mechanism. The heating mechanism described in Patent Document 1 has a conduit for passing cooling water of an engine, and can heat a return passage portion in which a blow-by gas passage is communicated with an intake passage. The blow-by gas recirculation device described in Patent Document 1 can heat the recirculation passage portion by the cooling water of the engine passing through the heating mechanism even if the blow-by gas recirculation device is cooled while being exposed to the outside in extremely cold weather. It is possible to prevent the water from freezing.

However, the heating mechanism of the blow-by gas recirculation device described in Patent Document 1 is in a state of being exposed to the outside on the engine. The cooling water that passes through the heating mechanism is directly exposed to the cooling air generated by the cooling fan of the engine. Therefore, the temperature of the cooling water drops. Therefore, the blow-by gas recirculation device described in Patent Document 1 has room for improvement in that the water content in the blow-by gas is more reliably suppressed from freezing and condensing.

Japanese Unexamined Patent Publication No. 2020-97910

The present invention has been made to solve the above problems, and is a blow-by gas treatment apparatus capable of more reliably suppressing the freezing and condensation of water vapor contained in the gas separated from the blow-by gas. And to provide an engine equipped with a blow-by gas treatment device.

The problem is a blow-by gas processing device for treating blow-by gas generated in an engine, in which a main pipe for introducing a new intake gas and the gas after separating the blow-by gas into oil and gas are introduced into the main pipe. The cooling water flow path is generated by the fan of the engine. The solution is solved by the blow-by gas processing apparatus according to the present invention, which is characterized by being arranged at a position where the wind is avoided.

The blow-by gas processing apparatus according to the present invention has a mixed joint having a main pipe for introducing new intake air and a sub-pipe for introducing gas after separating blow-by gas into oil and gas into the main pipe, and an engine. It is equipped with a cooling water flow path that guides cooling water and transfers heat to the gas flowing through the auxiliary pipe. The cooling water flow path is arranged at a position that avoids the wind generated by the fan of the engine. As a result, the temperature of the cooling water passing through the cooling water flow path is suppressed from being lowered by the wind generated by the fan. Therefore, the cooling water passing through the cooling water flow path efficiently transfers heat to the gas passing through the auxiliary pipe of the mixing joint separated from the blow-by gas, and the water vapor contained in the gas freezes or condenses in the mixing joint. That can be suppressed even more reliably.

In the blow-by gas treatment apparatus according to the present invention, preferably, the cooling water flow path has a heat exchange member arranged in contact with the sub-pipe of the mixing joint, and the heat exchange member is attached to the sub-pipe. On the other hand, it is characterized in that it is arranged at a position where the wind generated by the fan is avoided.

According to the blow-by gas treatment apparatus according to the present invention, the heat exchange member of the cooling water flow path is arranged at a position with respect to the auxiliary pipe to avoid the wind generated by the engine fan. As a result, the temperature of the cooling water passing through the heat exchange member is suppressed from being lowered by the wind generated by the fan of the engine. Therefore, the cooling water passing through the cooling water flow path is separated from the blow-by gas and efficiently transfers heat to the gas passing through the auxiliary pipe of the mixing joint via the heat exchange member, and the water vapor contained in the gas in the mixing joint freezes. It is possible to suppress or condense even more reliably.

The blow-by gas processing apparatus according to the present invention is preferably characterized in that the direction of the gas flow in the sub-pipe is orthogonal to the direction of the cooling water flow in the heat exchange member.

According to the blow-by gas treatment apparatus according to the present invention, the direction of the gas flow in the auxiliary pipe of the mixing joint is not parallel to the direction of the flow of the cooling water flowing through the heat exchange member, but is orthogonal to the direction. Thereby, the blow-by gas treatment apparatus according to the present invention can efficiently transfer heat to the gas separated from the blow-by gas by using the cooling water without heating the gas passing through the mixing joint more than necessary. ..

The blow-by gas processing apparatus according to the present invention is preferably provided inside the head cover of the engine, and has a separation portion for separating the blow-by gas into the oil and the gas, and an upper surface portion of the head cover toward the outside. Further provided is an outlet portion that is provided so as to project and supplies the gas guided from the separation portion to the sub-pipe of the mixing joint, and a pipe that connects the outlet portion and the sub-pipe of the mixing joint. The cooling water flow path is characterized in that it is arranged at a position in the vicinity of the outlet portion and the pipe so as to avoid the wind generated by the fan.

The blow-by gas processing apparatus according to the present invention is provided inside the head cover of the engine, and is provided with a separation portion for separating blow-by gas into oil and gas, and is provided so as to project outward from the upper surface portion of the head cover and is provided from the separation portion. An outlet portion for supplying the guided gas to the sub-pipe of the mixing joint and a pipe for connecting the outlet portion and the sub-pipe of the mixing joint are further provided. The cooling water flow path is arranged in the vicinity of the outlet portion and the pipe at a position where the wind generated by the engine fan is avoided. As a result, the cooling water flow path can avoid the wind from the fan in the vicinity of the outlet portion and the pipe. This makes it possible to prevent the temperature of the cooling water from dropping due to the wind generated by the engine fan. Therefore, the cooling water passing through the cooling water flow path efficiently transfers heat to the gas passing through the auxiliary pipe of the mixing joint separated from the blow-by gas, and the water vapor contained in the gas freezes or condenses in the mixing joint. That can be suppressed even more reliably.

In the blow-by gas treatment apparatus according to the present invention, the cooling water flow path is preferably arranged so that the flow of the cooling water has a downward gradient.

According to the blow-by gas treatment apparatus according to the present invention, since the cooling water flow path is arranged on a downward slope, the cooling water can be smoothly guided and the retention of the cooling water can be prevented. As a result, the blow-by gas mixing joint can prevent the water vapor contained in the gas from freezing and condensing at a low temperature by heating the gas passing through the auxiliary pipe with the heated cooling water.

In the blow-by gas treatment apparatus according to the present invention, preferably, the cooling water flow path is connected to the heat exchange member, the upstream path connected to the upstream side of the heat exchange member, and the downstream side of the heat exchange member. The upstream route is provided in an exhaust gas recirculation device that returns a part of the exhaust gas flowing through the exhaust system of the engine to the intake system of the engine as an exhaust recirculation gas. It is characterized by being connected to a water jacket.

According to the blow-by gas treatment apparatus according to the present invention, the upstream path is connected to the heat exchange member and guides the cooling water to the heat exchange member. Further, the upstream path is connected to a water jacket provided in the exhaust gas recirculation device. The exhaust gas recirculation device is a device that returns a part of the exhaust gas flowing through the exhaust system of the engine to the intake system of the engine as exhaust recirculation gas. Therefore, the cooling water guided to the heat exchange member receives heat from the exhaust recirculation gas in the exhaust gas recirculation device on the upstream side of the heat exchange member and is heated. Therefore, the blow-by gas treatment device according to the present invention has a temperature between the gas separated from the blow-by gas and the cooling water, as compared with the case where the upstream path is not connected to the water jacket of the exhaust gas recirculation device. Since the difference can be maintained high, the amount of heat transferred from the cooling water can be increased. As a result, the blow-by gas treatment apparatus according to the present invention efficiently transfers heat to the gas separated from the blow-by gas and passing through the mixing joint by using cooling water, and the water vapor contained in the gas freezes in the mixing joint. It is possible to suppress the squeezing and coagulation even more reliably.

In the blow-by gas treatment apparatus according to the present invention, preferably, the downstream path for guiding the cooling water after flowing through the heat exchange member determines the presence or absence of circulation of the cooling water between the engine and the radiator. It is characterized in that it is connected to a detour flow path that bypasses the radiator on the downstream side of the flow of the cooling water rather than the thermostat that switches according to the temperature of the cooling water.

According to the blow-by gas treatment apparatus according to the present invention, the downstream path is connected to the heat exchange member and guides the cooling water after flowing through the heat exchange member. Further, the downstream route is connected to a detour route that bypasses the radiator on the downstream side of the flow of the cooling water rather than the thermostat. The thermostat is a component that switches the presence or absence of cooling water circulation between the engine and the radiator according to the temperature of the cooling water. For example, if the temperature of the cooling water is below a predetermined temperature, the thermostat closes the valve to stop the circulation of the cooling water between the engine and the radiator, and the inside of the engine via a detour route that bypasses the radiator. Circulate the cooling water in the water jacket. On the other hand, for example, when the temperature of the cooling water reaches a predetermined temperature or higher and the warm-up operation of the engine is completed, the thermostat opens the valve and starts the circulation of the cooling water between the engine and the radiator. Due to the flow path resistance of the radiator, the flow rate of the cooling water when circulating through the radiator is smaller than the flow rate of the cooling water when circulating around the radiator. Here, if the downstream path that guides the cooling water after flowing through the heat exchange member is connected to the upstream side of the cooling water flow rather than the thermostat, the thermostat opens the valve and the cooling water to the radiator. When the circulation of the cooling water is started, the flow rate of the cooling water flowing through the heat exchange member decreases due to the flow path resistance of the radiator. On the other hand, according to the blow-by gas treatment apparatus according to the present invention, since the downstream route is connected to the detour route that bypasses the radiator on the downstream side of the cooling water flow rather than the thermostat, the thermostat opens the valve. However, since the cooling water does not receive the flow path resistance of the radiator, the flow rate of the cooling water flowing through the cooling water flow path does not decrease. Therefore, the amount of heat transferred from the cooling water in the heat exchange member can always be maintained high.

The subject is an engine including a blow-by gas processing device for processing blow-by gas generated in the engine, in which the blow-by gas processing device separates a main pipe for introducing a new intake air and the blow-by gas into oil and gas. The cooling water flow is provided with a mixing joint having a sub-pipe for introducing the gas to the main pipe, and a cooling water flow path for guiding the cooling water of the engine and transmitting heat to the gas flowing through the sub-pipe. The road is solved by the engine according to the present invention, characterized in that the road is arranged at a position avoiding the wind generated by the fan of the engine.

According to the engine according to the present invention, the blow-by gas processing apparatus has a main pipe for introducing a new intake air and a sub-pipe for introducing the gas after separating the blow-by gas into oil and gas into the main pipe. It is provided with a joint and a cooling water flow path that guides the cooling water of the engine and transfers heat to the gas of the auxiliary pipe. The cooling water flow path is arranged at a position that avoids the wind generated by the fan of the engine. As a result, the temperature of the cooling water passing through the cooling water flow path is suppressed from being lowered by the wind generated by the fan. Therefore, the cooling water passing through the cooling water flow path efficiently transfers heat to the gas passing through the auxiliary pipe of the mixing joint separated from the blow-by gas, and the water vapor contained in the gas freezes or condenses in the mixing joint. That can be suppressed even more reliably.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided an engine including a blow-by gas treatment device and a blow-by gas treatment device capable of more reliably suppressing freezing and condensation of water vapor contained in the gas separated from the blow-by gas. be able to.

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 looked at the engine equipped with the blow-by gas processing apparatus which concerns on this Embodiment from diagonally above. It is sectional drawing which shows the structural example of the blow-by gas mixing joint and the heat exchange member of this embodiment. It is a perspective view which shows the structural example of the blow-by gas mixing joint and the heat exchange member of this embodiment. It is a schematic diagram which shows the example which the type of a cooling fan is different.

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.

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. Further, the engine 1 may form a hybrid drive device by combining a drive charge power battery and a drive electric motor.

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 spill 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 (an example of a 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 newly intake AR and the gas G are mixed with each other 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.

Next, a structural example of the blow-by gas treatment apparatus according to the present embodiment will be described with reference to the drawings.
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.

Here, the X direction shown in FIGS. 1 and 2 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, has a main structural portion 101, an outlet portion 40, and a blow-by gas mixing joint 70. The main structural portion 101 is arranged in the head cover 4. The outlet portion 40 and the blow-by gas mixing joint 70 are provided so as to be exposed to the outside of the head cover 4. The main structural part 101 can separate the blow-by gas BG into the oil OL and the gas G, and guide the oil OL and the gas G by different routes.

As shown in FIG. 2, 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. A detailed structural example of the outlet portion 40 will be described after explaining the detailed structural example of the main structural portion 101.

First, a structural example of the main structural portion 101 of the blow-by gas processing 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. The first oil drain 161 and the second oil drain 162 are examples of the "oil drain" 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.

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.

Next, the separation unit 330 will be described with reference to FIG.
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.

The impactor 120 has the function of a nozzle or an orifice. The axial direction of the throttle hole 121 of the impactor 120 is a so-called vertical throttle hole along the vertical direction or the vertical direction which is the Z direction. 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 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.

As shown in FIG. 2, the filter 130 is interchangeably mounted on the partition wall portion 200. The filter 130 is a member for improving the performance of separating oil OL from blow-by gas BG (that is, the separation performance of oil OL), and is made of a material such as glass wool or steel wool. However, the material of the filter 130 is not particularly limited. The filter 130 is arranged between the collision plate 133 and 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 the horizontal direction. The collision plate 133 separates the oil OL and the gas G containing no mist of the oil OL by colliding the blow-by gas BG that has passed through the filter 130 with the flow velocity increasing. The blow-by gas BG having an increased flow velocity is separated into an oil OL and a gas G containing no mist of the oil OL by colliding with the collision plate 133 while removing foreign matter through the filter 130. Then, 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. Since the guide wall portion 203 is arranged in the head cover 4, the gas G separated by the separation portion 330 can be guided to the outlet portion 40.

On the other hand, the oil OL separated from the blow-by gas BG by the separation unit 330 falls through the filter 130 and falls on the upper surface of the impactor 120. The oil OL that has fallen on the upper surface of the impactor 120 flows along the upper surface of the impactor 120, and flows toward the first oil guide groove portion 151 and the second oil guide groove portion 152.

The separation unit 330 is located at the central position RP in the X direction shown in FIG. 2, and serves as an assembly unit capable of collecting the blow-by gas BG from the front side and the rear side of the engine 1 toward the central portion in the X direction. Play the role of. 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.

Next, the first oil guide groove portion 151 and the second oil guide groove portion 152 will be described with reference to FIG.
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 forward as shown by 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 may be connected to each other. In this case, of the one oil guide groove portion, the portion provided from the filter 130 toward the front side of the engine 1 is referred to as the first oil guide groove portion 151, and is provided from the filter 130 toward the rear side of the engine 1. The portion is referred to as a second oil guide groove portion 152.

Next, the first oil drain 161 and the second oil drain 162 will be described with reference to FIG.
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.

Next, a structural example of the outlet portion 40 of the blow-by gas processing apparatus 100 will be described with reference to FIG.
As described above, the outlet portion 40 shown in FIG. 2 is provided in the head cover 4 so as to project in the Z direction. Specifically, the outlet portion 40 is provided so as to project outward from the upper surface portion 4A of the head cover 4. The outlet portion 40 is arranged, for example, at a position CP substantially in the center with respect to the front-rear direction which is the X direction of the main structural portion 101 of the head cover 4.

As shown in FIG. 2, the outlet portion 40 has a pressure regulating valve (diaphragm) 350 and a container body 750, and adjusts the pressure of the gas G at, for example, a position CP at the substantially center of the engine 1 to be main. Only the gas G guided from the structure portion 101 is sent to the intake system pipe 41 of the engine 1. That is, the outlet portion 40 can return the gas G separated from the blow-by gas BG by the separation portion 330 to the intake system of the engine 1 via the pipe 41 and reburn it. This prevents the gas G separated from the blow-by gas BG from being released to the outside of the engine 1, and can improve the environmental performance of the engine 1.

The pressure regulating valve 350 adjusts the pressure between the inside of the engine 1 and the intake system of the engine 1, and the new intake AR flows into the engine 1 through the blow-by gas mixing joint 70 and the intake system piping 41. (See Fig. 1).

As shown in FIG. 2, the container body 750 is indirectly fixed to the upper surface portion 4A of the head cover 4 via the outlet mounting portion 700, and holds the pressure regulating valve 350. The container body 750 may be directly fixed to the upper surface portion 4A of the head cover 4 without going through the outlet mounting portion 700. Alternatively, the outlet mounting portion 700 may be a part of the head cover 4, and is formed so as to bulge outward from the upper surface portion 4A of the head cover 4 around the through hole 680 for gas discharge provided in the head cover 4. ing.

The through hole 680 for gas discharge is provided so as to penetrate the upper surface portion 4A of the head cover 4 in a circular shape along the Z direction. That is, the central axis of the through hole 680 for gas discharge is along the Z direction. The through hole 680 allows the gas G separated from the blow-by gas BG by the separation portion 330 to pass through.

The container body 750, also called a spacer or the like, is installed on the outlet mounting portion 700. The container body 750 temporarily accommodates the gas G rising from the inside of the head cover 4 through the through hole 680 of the outlet mounting portion 700, and supplies the gas G to the intake system side of the engine 1 shown in FIG. 1 through the pipe 41. be able to. The container body 750 has a gas flow path 42. The gas flow path 42 passes through the through hole 680 and further passes through the pressure regulating valve 350, and guides the gas G to the intake system of the engine 1 through the pipe 41.

Next, a structural example of the engine 1 and the blow-by gas processing apparatus 100 according to the present embodiment will be described in detail with reference to FIG.
FIG. 3 is a perspective view of an engine including a blow-by gas processing device according to the present embodiment as viewed from diagonally above.
FIG. 3A shows an overall image of the engine 1. FIG. 3B is an enlarged view of a part A1 of the engine 1 shown in FIG. 3A.

As shown in FIGS. 3A and 3B, the outlet portion 40 of the blow-by gas processing device 100, the blow-by gas mixing joint 70, and the cooling water flow path 400 are provided outside the head cover 4 of the engine 1. ing. The outlet portion 40 of the blow-by gas processing device 100 projects outward from the upper surface portion 4A of the head cover 4 and is fixed.

As shown in FIGS. 3A and 3B, the cooling water flow path 400 is arranged along the upper surface portion 4A outside the head cover 4. The cooling water flow path 400 is, for example, a metal pipe having a circular cross section for passing cooling water. As shown in FIG. 3B, the cooling water flow path 400 has an upstream side path 461, a downstream side path 462, and a heat exchange member 380. As shown in FIG. 3A, one end portion 361B of the upstream side path 461 of the cooling water flow path 400 is connected to the exhaust gas recirculation device 80.

As shown in FIG. 3A, the exhaust gas recirculation device 80 includes an EGR cooler 81 and an EGR valve 82, and a part of the exhaust gas flowing through the exhaust system of the engine 1 is shown in FIG. 3A. As the exhaust gas recirculation gas ECG shown in the above, the exhaust gas recirculates to the intake system of the engine 1. Specifically, one end 361B of the upstream path 461 is connected to a water jacket (not shown) provided in the EGR valve 82 of the exhaust gas recirculation device 80, and flows through the water jacket of the EGR valve 82. A part of the cooling water is taken out and guided to the other end 361C of the upstream path 461 shown in FIG. 3 (B). The cooling water used is, for example, an LLC (Long Life Coolant) that cools the cylinder block 2 and the cylinder head 3 shown in FIG. 2, and is about 70 to 80 ° C. after the warm-up operation of the engine 1 is completed. It becomes the temperature.

As shown in FIG. 3B, the other end 361C of the upstream path 461 is connected to one end 381 of the heat exchange member 380. The heat exchange member 380 is, for example, a metal tubular member, and is provided as a linear member. The heat exchange member 380 is provided so as to be mechanically and thermally integrated with the auxiliary pipe 72 of the blow-by gas mixing joint 70.

FIG. 4 is a cross-sectional view showing a structural example of the blow-by gas mixing joint and the heat exchange member of the present embodiment.
FIG. 5 is a perspective view showing a structural example of the blow-by gas mixing joint and the heat exchange member of the present embodiment.
Note that FIG. 4 is a cross-sectional view of the cut surface A4-A4 shown in FIG.

The axial CL1 of the main pipe 71 of the blow-by gas mixing joint 70 is orthogonal to the axial CL2 of the sub pipe 72. Moreover, the axial CL3 of the heat exchange member 380 is orthogonal to the axial CL1 of the main pipe 71 and the axial CL2 of the sub pipe 72.

Returning to FIG. 3B, the downstream path 462 of the cooling water flow path 400 is connected between the other end 382 of the heat exchange member 380 and the thermostat cover 371. The thermostat cover 371 is provided in a detour route (not shown) that bypasses the radiator on the downstream side of the cooling water flow from the thermostat. Therefore, the downstream route 462 is connected to a detour route that bypasses the radiator on the downstream side of the cooling water flow from the thermostat.

The thermostat (not shown) is a component that switches the presence or absence of cooling water circulation between the engine 1 and the radiator (not shown) according to the temperature of the cooling water. For example, when the temperature of the cooling water is lower than the predetermined temperature, the thermostat closes a valve (not shown) to stop the circulation of the cooling water between the engine 1 and the radiator, and goes through a detour route that bypasses the radiator. Then, the cooling water is circulated in the water jacket (not shown) inside the engine 1. On the other hand, for example, when the temperature of the cooling water becomes equal to or higher than a predetermined temperature and the warm-up operation of the engine 1 is completed, the thermostat opens the valve and starts the circulation of the cooling water between the engine 1 and the radiator.

Next, a characteristic arrangement example of the upstream side path 461 and the downstream side path 462 of the cooling water flow path 400 will be described with reference to FIG.
As described above, the upstream path 461 and the downstream path 462 pass through the heat exchange member 380 from the EGR valve 82 and reach the thermostat cover 371. The upstream path 461, the heat exchange member 380, and the downstream path 462 are arranged so as to have a downward gradient.

As a result, the upstream path 461 of the cooling water flow path 400 transfers the heated cooling water taken out from the water jacket of the EGR valve 82 to the heat exchange member 380 along the arrow F1 direction shown in FIG. 3 (B). It can be guided smoothly. Then, the cooling water flowing through the heat exchange member 380 heats the gas G passing through the auxiliary pipe 72 of the blow-by gas mixing joint 70.

Further, the downstream path 462 of the cooling water flow path 400 can smoothly guide the cooling water to the thermostat cover 371 along the arrow F2 direction shown in FIG. 3 (B). That is, by arranging the cooling water flow path 400 on the head cover 4 in a downward gradient, the cooling water can be smoothly guided from the EGR valve 82 to the thermostat cover 371, and the retention of the cooling water can be prevented. As a result, the blow-by gas mixing joint 70 heats the gas G passing through the auxiliary pipe 72 using the cooling water taken out from the water jacket and heated, thereby freezing the water vapor contained in the gas G at a low temperature. And condensation can be prevented more reliably.

Next, an example of the arrangement shape of the upstream side path 461 and the downstream side path 462 of the cooling water flow path 400 will be described.
First, an example of the arrangement shape of the upstream route 461 will be described. As shown in FIG. 3A, the engine 1 includes a cooling fan 372 (an example of a fan) on the suction side on the front side of the engine 1. When the engine 1 operates, the cooling fan 372 generates a cooling air WD toward the rear of the engine 1 in order to cool the engine 1.

If the cooling air WD generated by the cooling fan 372 cools the heated cooling water passing through the upstream path 461, the cooling water heats the gas G passing through the auxiliary pipe 72 of the blow-by gas mixing joint 70. It becomes difficult to heat via the replacement member 380. Therefore, in the blow-by gas mixing joint 70, it may not be possible to reliably prevent the water vapor contained in the gas G from freezing or condensing.

Therefore, in the present embodiment, in order to prevent the cooling water passing through the cooling water flow path 400 from being cooled by the cooling air WD of the cooling fan 372, an example of the arrangement shape of the upstream side path 461 is devised as follows. The upstream path 461 is arranged at a position in the vicinity of the region from the outlet portion 40 to the heat exchange member 380 so as to avoid the cooling air WD generated by the cooling fan 372. As specifically shown in FIG. 3B, the upstream route 461 has portions 391, 392, 393. The portions 391, 392, 393 of the upstream route 461 are located on the rear side with respect to the outlet portion 40 and the pipe 41 so that the cooling air WD does not directly hit them, that is, with respect to the outlet portion 40 and the pipe 41. It is arranged on the downstream side of the cooling air WD. The portion 391 is arranged so as to be on the rear side with respect to the outlet portion 40, that is, on the downstream side of the cooling air WD with respect to the outlet portion 40. Further, the portions 392 and 393 are arranged so as to be on the rear side with respect to the pipe 41, that is, on the downstream side of the cooling air WD with respect to the pipe 41. Therefore, the entire upstream path 461 of the cooling water flow path 400 is arranged at a position avoiding the cooling air WD generated by the cooling fan 372 of the engine 1.

As a result, the flow of the cooling air WD is blocked by the presence of the outlet portion 40 and the pipe 41. Then, the cooling air WD is prevented from directly hitting the upstream side path 461, and the heated cooling water passing through the upstream side path 461 is suppressed from being cooled by the cooling air WD. That is, it is possible to suppress the occurrence of the phenomenon that the cooling air WD cools the heated cooling water passing through the upstream path 461, and prevent the temperature of the cooling water from being lowered by the cooling air WD. Then, the cooling water can efficiently heat the gas G passing through the auxiliary pipe 72 of the blow-by gas mixing joint 70 via the heat exchange member 380, and the water vapor contained in the gas G freezes in the blow-by gas mixing joint 70. It is possible to more reliably suppress the formation and condensation.

Moreover, as shown in FIGS. 3B, 4 and 5, the heat exchange member 380 itself of the cooling water flow path 400 is also generated by the cooling fan 372 in the vicinity of the auxiliary pipe 72 of the blow-by gas mixing joint 70. It is arranged at a position that avoids the cooling air WD. Specifically, as shown in FIGS. 4 and 5, the heat exchange member 380 is arranged on the rear side with respect to the sub-pipe 72, that is, on the downstream side of the cooling air WD with respect to the sub-pipe 72. Have been placed. Therefore, the flow of the cooling air WD is blocked by the auxiliary pipe 72. Then, the cooling air WD is prevented from directly hitting the heat exchange member 380. As a result, the cooling water can efficiently heat the gas G passing through the auxiliary pipe 72 of the blow-by gas mixing joint 70 via the heat exchange member 380, and the water vapor contained in the gas G freezes in the blow-by gas mixing joint 70. It is possible to more reliably suppress the shrinkage and condensation.

Further, the downstream path 462 of the cooling water flow path 400 is provided so as to be the shortest distance from the heat exchange member 380 to the thermostat cover 371. As a result, the cooling water can quickly return to the thermostat cover 371 after heating the gas G passing through the auxiliary pipe 72 of the blow-by gas mixing joint 70 via the heat exchange member 380.

(Explanation of freeze or condensation prevention treatment of gas G flowing in the auxiliary pipe 72 of the blow-by gas mixing joint 70)
Next, a process for preventing freezing or condensation of the gas G flowing in the auxiliary pipe 72 of the blow-by gas mixing joint 70 will be described.
First, the flow of the gas G separated from the blow-by gas BG by the separation unit 330 shown in FIG. 2 will be described first. The gas G separated from the blow-by gas BG by the separation portion 330 shown in FIG. 2 passes through the through hole 680 of the outlet mounting portion 700, and the gas G passing through the through hole 680 is guided to the pressure regulating valve 350. Then, when the pressure inside the engine 1 rises to a pressure equal to or higher than a predetermined value, or when the pressure of the intake system of the engine 1 drops to a pressure lower than a predetermined pressure, the pressure regulating valve 350 opens. Then, the gas G guided to the pressure regulating valve 350 is guided to the intake system of the engine 1 through the pipe 41.

Here, as shown in FIG. 3, the blow-by gas mixing joint 70 of the blow-by gas processing device 100 is provided so as to project outward on the upper surface portion 4A of the head cover 4. On the other hand, the blow-by gas BG and the gas G separated from the blow-by gas BG contain water vapor. Therefore, when the engine 1 is placed in a low temperature state, the water vapor contained in the gas G freezes or condenses in the blow-by gas mixing joint 70, which may cause the auxiliary pipe 72 to be blocked. Then, the pipe 41 from the outlet 40 of the blow-by gas processing device to the intake system of the engine and the gas path to the blow-by gas mixing joint 70 may be blocked. When the gas path is blocked, the internal pressure of the engine rises, and there is a risk that parts such as the oil gauge guide provided in the crankcase will be damaged. In addition, if the gas path is blocked, the internal pressure of the engine rises, and the turbocharger may suck in oil.

In order to prevent such blockage of the gas path, the engine 1 provided with the blow-by gas processing device 100 and the blow-by gas processing device 100 according to the present embodiment is devised as shown in FIG. The cooling water of the engine 1 passing through the cooling water flow path 400 is, for example, an LLC that cools the cylinder block 2 and the cylinder head 3, and the temperature becomes about 70 to 80 ° C. after the warm-up operation of the engine 1 is completed. ..
Therefore, the cooling water flowing through the cooling water flow path 400 transfers heat to the gas G flowing in the auxiliary pipe 72 of the blow-by gas mixing joint 70 shown in FIG. 3 via the heat exchange member 380 of the cooling water flow path 400. , The temperature of the gas G flowing in the sub-pipe 72 can be raised.

As illustrated in FIGS. 4 and 5, the heat exchange member 380 of the cooling water flow path 400 is a straight pipe, and is attached or integrally attached so as to be in direct contact with the auxiliary pipe 72 of the blow-by gas mixing joint 70. It is formed in a linear manner and guides the cooling water linearly. Moreover, the heat exchange member 380 of the cooling water flow path 400 is arranged at a position with respect to the auxiliary pipe 72 so as to avoid the wind generated by the cooling fan 372 of the engine 1.

As a result, the temperature of the cooling water passing through the heat exchange member 380 is suppressed from being lowered by the cooling air WD generated by the cooling fan 372. Therefore, the cooling water passing through the cooling water flow path 400 can be separated from the blow-by gas BG and efficiently transfer heat to the gas G passing through the auxiliary pipe 72. Therefore, in the blow-by gas mixing joint 70, it is possible to more reliably suppress the freezing and condensation of the water vapor contained in the gas G.

Further, since the heat exchange member 380 linearly guides the cooling water at a position in contact with the sub-pipe 72, it is possible to suppress a decrease in the flow velocity of the cooling water flowing in the heat exchange member 380. As a result, it is possible to suppress a decrease in the heat transfer coefficient between the cooling water flowing in the heat exchange member 380 and the gas G passing through the auxiliary pipe 72. Further, since the heat exchange member 380 linearly guides the cooling water, it is possible to suppress the occurrence of a dead water area in the heat exchange member 380.

Moreover, as illustrated in FIGS. 4 and 5, the direction of the gas G flowing in the sub-pipe 72 and the direction of the cooling water flowing in the heat exchange member 380 of the cooling water flow path 400 are parallel to each other. Not at all, but orthogonal to each other. As a result, in the blow-by gas treatment apparatus 100 according to the present embodiment, the cooling water does not heat the gas G passing through the auxiliary pipe 72 of the blow-by gas mixing joint 70 more than necessary, and is separated from the blow-by gas BG by the separation unit 330. Cooling water can be used to efficiently transfer heat to the generated gas G.

Further, the upstream path 461 of the cooling water flow path 400 shown in FIG. 3 is connected to a water jacket provided in the exhaust gas recirculation device 80 (EGR valve 82 in this embodiment). Therefore, the cooling water guided to the upstream side path 461 of the cooling water flow path 400 is heated by receiving heat from the exhaust gas recirculation device 80 in the exhaust gas recirculation device 80 on the upstream side of the cooling water flow path 400.

Therefore, the blow-by gas treatment device 100 according to the present embodiment has a temperature difference between the gas G and the cooling water as compared with the case where the upstream path 461 is not connected to the water jacket of the exhaust gas recirculation device 80. Can be maintained high, so that the amount of heat transferred from the cooling water to the gas G in the blow-by gas mixing joint 70 can be increased. As a result, the blow-by gas treatment apparatus 100 according to the present embodiment efficiently transfers heat to the gas G separated from the blow-by gas BG by the separation unit 330 using cooling water, and the water vapor contained in the gas G is blow-by gas. It is possible to more reliably suppress freezing and condensation in the mixing joint 70.

On the other hand, as shown in FIG. 3, the downstream path 462 guides the cooling water after flowing in the heat exchange member 380 of the cooling water flow path 400. Further, the downstream route 462 is connected to a detour route (thermostat cover 371 in this embodiment) that bypasses the radiator on the downstream side of the flow of the cooling water with respect to the thermostat.

Here, if the downstream path 462 that guides the cooling water after flowing through the heat exchange member 380 of the cooling water flow path 400 is connected to the upstream side of the cooling water flow rather than the thermostat, the thermostat is connected. When the valve is opened and the circulation of the cooling water to the radiator is started, the flow rate of the cooling water flowing through the cooling water flow path 400 decreases due to the flow path resistance of the radiator.

On the other hand, according to the blow-by gas treatment apparatus 100 according to the present embodiment, the downstream route 462 is connected to a detour route that bypasses the radiator on the downstream side of the cooling water flow from the thermostat. Therefore, even if the thermostat opens the valve, the cooling water does not receive the flow resistance of the radiator, so that the flow rate of the cooling water flowing through the cooling water flow path 400 does not decrease. Therefore, the amount of heat transferred from the cooling water in the cooling water flow path 400 can always be maintained high.

(Other Embodiments of the present invention)
FIG. 6 is a schematic diagram showing an example in which the types of cooling fans are different.
FIG. 6A shows an example of the suction type cooling fan 372 already described. The cooling water flow path 400 including the heat exchange member 380 is arranged at a position where the cooling air WD generated by the cooling fan 372 is avoided.

On the other hand, in another embodiment of the present invention shown in FIG. 6B, an example of a sweep-out type cooling fan 379 is shown. In the example shown in FIG. 6B, the direction of the cooling air WD1 generated by the cooling fan 379 (an example of the fan) is opposite to the direction of the cooling air WD shown in FIG. 6A. Therefore, the cooling water flow path 400 including the heat exchange member 380 is arranged at the opposite position so as to avoid the cooling air WD1 generated by the cooling fan 379.
Further, in still another embodiment of the present invention shown in FIG. 6C, an example of a suction type cooling fan 388 arranged on the upper side of the engine is shown. In the example shown in FIG. 6C, the cooling water flow path 400 including the heat exchange member 380 is arranged at a position avoiding the cooling air WD2 generated by the cooling fan 388 (an example of the fan).

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.

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: Upper area, 4R: Upper area, 5: Cylinder, 6: Crank case, 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: Piping, 42: Gas flow path, 50: Intake pipe, 50T: Connection pipe, 52: Air cleaner, 60: Turbo charger, 61: Blower, 62: Turbine, 70: Blow-by Gas mixing joint, 71: Main pipe, 72: Sub pipe, 80: Exhaust gas recirculation device, 81: EGR cooler, 82: EGR valve, 99: Oil return path, 100: Blow-by gas treatment device, 101: Main structure Part, 111: 1st blow-by gas intake part, 112: 2nd blow-by gas intake part, 120: impactor, 121: throttle hole, 130: filter, 133: collision plate, 135: passage, 151: 1st oil guide groove part, 152: 2nd oil guide groove, 161: 1st oil drain, 162: 2nd oil drain, 200: partition wall, 203: guide wall, 231: 1st guide lower surface, 232: 2nd guide lower surface, 295: Guide plate, 330: Separation part, 350: Pressure regulating valve, 361B: One end, 361C: The other end, 371: Thermostat cover, 372: Cooling fan, 379: Cooling fan, 380: Heat exchange member, 381: One end Part, 382: other end, 388: cooling fan, 391: part, 392: part, 393: part, 400: cooling water flow path, 461: upstream route, 462: downstream route, 680: through hole, 700: Outlet mounting part, 750: Container body, AR: New intake, B: Intake air, BG: Blow-by gas, C: Intake air, CL1: Axial direction, CL2: Axial direction, CL3: Axial direction, ECG: Exhaust gas recirculation gas, G: Gas, OL: Oil, RP: Central position, WD: Cooling air, WD1 : Cooling air, WD2: Cooling air

Claims (8)

A blow-by gas processing device that processes blow-by gas generated in an engine.
A mixed joint having a main pipe for introducing a new intake air and an auxiliary pipe for introducing the gas into the main pipe after separating the blow-by gas into oil and gas.
A cooling water flow path that guides the cooling water of the engine and transfers heat to the gas flowing through the sub-pipe.
Equipped with
The blow-by gas treatment apparatus, characterized in that the cooling water flow path is arranged at a position for avoiding the wind generated by the fan of the engine. The cooling water flow path has a heat exchange member arranged in contact with the sub-pipe of the mixing joint, and the heat exchange member is located at a position to avoid the wind generated by the fan with respect to the sub-pipe. The blow-by gas treatment apparatus according to claim 1, wherein the blow-by gas treatment apparatus is arranged. The blow-by gas treatment apparatus according to claim 2, wherein the direction of the gas flow in the sub-pipe is orthogonal to the direction of the cooling water flow in the heat exchange member. A separation portion provided inside the head cover of the engine to separate the blow-by gas into the oil and the gas.
An outlet portion that is provided so as to project outward from the upper surface portion of the head cover and supplies the gas guided from the separation portion to the sub-pipe of the mixing joint.
A pipe connecting the outlet portion and the auxiliary pipe of the mixed joint, and
Further prepare
The blow-by gas treatment apparatus according to claim 2 or 3, wherein the cooling water flow path is arranged at a position in the vicinity of the outlet portion and the pipe so as to avoid the wind generated by the fan. The blow-by gas treatment apparatus according to any one of claims 2 to 4, wherein the cooling water flow path is arranged so that the flow of the cooling water has a downward gradient. The cooling water flow path includes the heat exchange member, an upstream path connected to the upstream side of the heat exchange member, and a downstream path connected to the downstream side of the heat exchange member.
The upstream path is characterized in that a part of the exhaust gas flowing through the exhaust system of the engine is connected to a water jacket provided in an exhaust gas recirculation device that returns a part of the exhaust gas to the intake system of the engine as an exhaust gas return gas. The blow-by gas treatment apparatus according to any one of claims 2 to 5. The downstream path that guides the cooling water after flowing through the heat exchange member is more cooling than a thermostat that switches the presence or absence of circulation of the cooling water between the engine and the radiator according to the temperature of the cooling water. The blow-by gas treatment apparatus according to claim 6, wherein the blow-by gas treatment apparatus is connected to a detour flow path that bypasses the radiator on the downstream side of the water flow. 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 mixed joint having a main pipe for introducing a new intake air and an auxiliary pipe for introducing the gas into the main pipe after separating the blow-by gas into oil and gas.
A cooling water flow path that guides the cooling water of the engine and transfers heat to the gas flowing through the sub-pipe.
Equipped with
The engine is characterized in that the cooling water flow path is arranged at a position where the wind generated by the fan of the engine is avoided.

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