Blow-by gas treatment device and engine provided with blow-by gas treatment device

Abstract

The invention provides a blow-by gas treatment device and an engine provided with the blow-by gas treatment device, wherein the blow-by gas treatment device can further reliably prevent water vapor contained in gas separated from blow-by gas from freezing or condensing. This blow-by gas treatment device is characterized by being provided with: a mixing joint (70) having a main pipe (71) for introducing new intake gas, and a sub pipe (72) for introducing into the main pipe (71) gas obtained by separating blow-by gas into oil and gas; and a heating device (500) provided to a sub-pipe (72) of the mixing joint (70). The heating device (500) is provided with: a heat storage unit (510) provided in the vicinity of the connection position with the main pipe (71) in the sub-pipe (72); and an electric heater (520) provided in the heat storage unit (510).

Description

Technical Field

[0001] The present invention relates to a blow-by gas treatment device and an engine having the blow-by gas treatment device. The blow-by gas treatment device is mounted on an internal combustion engine such as a diesel engine, separates blow-by gas into oil and gas, and supplies the gas to an intake system of the engine. Background Art

[0002] A blow-by gas treatment device that separates blow-by gas generated in the engine into gases such as oil and unburned gas and supplies the gas separated from the blow-by gas to the engine's intake system, for example, installed in the cylinder head cover of a diesel engine. The gas separated from the blow-by gas is transported to the mixing joint through a pipe and mixed with new intake air at the mixing joint. Thereafter, the mixed gas and the new intake air are supplied to the engine's intake system.

[0003] This type of mixing joint is not provided inside the cylinder head cover of the engine, but is provided in a state of being exposed to the outside of the engine. On the other hand, the gas separated from the blow-by gas contains water vapor. Therefore, if the engine is in a low temperature state, the water vapor contained in the gas separated from the blow-by gas may freeze or condense in the mixing joint.

[0004] In this case, the gas path from the mixing joint to the intake system of the engine may be blocked by frozen or condensed water. If the gas path is blocked, the internal pressure of the engine increases, and for example, the oil seal provided in the crankcase may be damaged or curled, causing oil leakage. In addition, if the gas path is blocked, the internal pressure of the engine increases, and the oil level gauge is pulled out from the oil level gauge guide, which may cause oil leakage. Furthermore, if the gas path is blocked, the internal pressure of the engine increases, and the turbocharger may suck oil from the cylinder head cover.

[0005] In this regard, Patent Document 1 discloses a gas recirculation device equipped with a heating mechanism. The heating mechanism described in Patent Document 1 has a pipe for passing engine cooling water, and can heat the recirculation passage portion that connects the blow-by gas passage and the intake passage. The blow-by gas recirculation device described in Patent Document 1 can heat the recirculation passage portion using the engine cooling water that passes through the heating mechanism even when it is exposed to the outside and cooled in extreme cold, thereby preventing the moisture in the blow-by gas from freezing.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2020-97910 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, the heating mechanism of the blow-by gas recirculation device described in Patent Document 1 is exposed to the outside on the engine. The cooling water passing 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 decreases.

[0011] As described above, there is still room for improvement in the blow-by gas treatment device in terms of further reliably suppressing the freezing or condensation of moisture in the blow-by gas.

[0012] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a blow-by gas treatment device and an engine having the blow-by gas treatment device that can more reliably suppress freezing or condensation of water vapor contained in gas separated from the blow-by gas.

[0013] Means used to solve problems

[0014] A first embodiment of the present invention is a blow-by gas treatment device for treating blow-by gas generated in an engine, characterized in that it comprises: a mixing joint having a main pipe for introducing new intake air and a sub-pipe for introducing the gas after the blow-by gas is separated into oil and gas into the main pipe; and a heating device, which is arranged in the sub-pipe of the mixing joint; the heating device comprises: a heat storage part, which is arranged in the vicinity of the connection position with the main pipe in the sub-pipe; and an electric heater, which is arranged in the heat storage part.

[0015] According to the first aspect of the present invention, a heat storage unit is provided near the connection position of the secondary pipe with the main pipe, so that the heat generated by the electric heater can be stored in the heat storage unit and effectively transferred from the heat storage unit to the connection position of the secondary pipe and the main pipe. This heat can further reliably suppress the freezing or condensation of water vapor contained in the gas in the mixing joint.

[0016] According to a second aspect of the present invention, in the first aspect of the present invention, the blowby gas treatment device is characterized in that the sub-pipe has a gradually increasing portion whose wall thickness gradually increases from far to near the connection position; and the heat storage part includes at least a part of the gradually increasing portion.

[0017] According to the second aspect of the present invention, at least a portion of the gradually increasing thickness portion of the sub-pipe is used as a heat storage portion, so that heat generated by the electric heater can be stored in the gradually increasing portion and effectively transmitted to the connection position of the sub-pipe and the main pipe.

[0018] According to a third aspect of the present invention, in the first or second aspect of the present invention, the blowby gas treatment device is characterized in that the heat storage unit has: a first portion in contact with the outer surface of the sub-pipe; and a second portion extending from the first portion to the outer surface of the main pipe.

[0019] According to the third embodiment of the present invention, the heat storage portion is provided from the portion in contact with the outer surface of the sub-pipe (the first portion) to the portion extending to the outer surface of the main pipe (the second portion), so that the stored heat can be transferred to the sub-pipe through the first portion and to the main pipe through the second portion.

[0020] According to a fourth aspect of the present invention, in the third aspect of the present invention, the blow-by gas treatment device is characterized in that the second portion is in contact with at least half of the circumference of the outer surface of the main pipe when viewed from the extending direction of the main pipe.

[0021] According to the fourth aspect of the present invention, since the second portion is provided so as to be in contact with at least half of the outer surface of the main pipe, the heat generated by the electric heater can be efficiently transferred from the second portion to the main pipe.

[0022] According to a fifth aspect of the present invention, in the third aspect of the present invention, the blow-by gas treatment device is characterized in that the first portion has a flat first surface; and the electric heater is mounted on the first surface.

[0023] According to the fifth aspect of the present invention, the electric heater is brought into surface contact with the flat first surface of the first portion, so that the heat generated by the electric heater can be efficiently transferred to the first portion.

[0024] According to a sixth aspect of the present invention, in the third aspect of the present invention, the blow-by gas treatment device is characterized in that the first portion and the second portion are provided integrally with the mixing joint.

[0025] According to the sixth aspect of the present invention, since the first portion and the second portion are provided integrally with the mixing joint, it is not necessary to separately connect the heat storage portion to the mixing joint, and the manufacturing process can be simplified.

[0026] According to a seventh aspect of the present invention, in any one of the first to sixth aspects of the present invention, the blow-by gas treatment device is characterized in that the heat storage unit is in contact with at least half of the outer surface of the sub-pipe when viewed from the extending direction of the sub-pipe.

[0027] According to the seventh aspect of the present invention, the heat storage unit is provided in contact with at least half of the outer surface of the sub-pipe, so that the heat generated by the electric heater can be efficiently transferred from the heat storage unit to the sub-pipe.

[0028] According to the eighth embodiment of the present invention, in any one of the first to seventh embodiments of the present invention, the blowby gas treatment device is characterized in that the blowby gas treatment device also has a cooling water flow path, which guides cooling water of the engine and transfers heat to the gas flowing in the sub-pipe.

[0029] According to the 8th scheme of the present invention, the cooling water passing through the cooling water flow path can effectively transfer heat to the gas separated from the blowby gas and passing through the sub-pipe of the mixing joint, thereby heating the mixing joint from both sides together with the heat from the heating device, thereby further reliably suppressing the water vapor contained in the gas from freezing or condensing in the mixing joint.

[0030] According to a ninth aspect of the present invention, in the eighth aspect of the present invention, the blow-by gas treatment device is characterized in that the cooling water flow path is arranged at a position away from wind generated by a fan of the engine.

[0031] According to the ninth aspect of the present invention, the temperature of the cooling water passing through the cooling water flow path is suppressed from decreasing due to the wind generated by the fan of the engine. Therefore, the cooling water passing through the cooling water flow path effectively transfers heat to the gas separated from the blow-by gas and passing through the sub-pipe of the mixing joint via the heat exchange member, thereby further reliably suppressing the water vapor contained in the gas from freezing or condensing in the mixing joint.

[0032] According to a tenth aspect of the present invention, in any one of the first to ninth aspects of the present invention, the blowby gas treatment device is characterized in that the electric heater includes a PTC (Positive Temperature Coefficient) heater.

[0033] According to the tenth aspect of the present invention, since the temperature is self-controlled by the positive temperature characteristic of the PTC heater, it is not necessary to provide a separate control unit for the electric heater, and the device structure can be simplified.

[0034] The 11th scheme of the present invention is an engine, having a blow-by gas treatment device for treating blow-by gas generated in the engine, characterized in that the blow-by gas treatment device comprises: a mixing joint, having a main pipe for introducing new intake air and a sub-pipe for introducing the gas after the blow-by gas is separated into oil and gas into the main pipe; and a heating device, which is arranged in the sub-pipe of the mixing joint; the heating device comprises: a heat storage part, which is arranged in the vicinity of the connection position with the main pipe in the sub-pipe; and an electric heater, which is arranged in the heat storage part.

[0035] According to the 11th aspect of the present invention, a heat storage unit is provided near the connection position of the auxiliary pipe with the main pipe, so that the heat generated by the electric heater can be stored in the heat storage unit and effectively transferred from the heat storage unit to the connection position of the auxiliary pipe and the main pipe. This heat can further reliably suppress the freezing or condensation of water vapor contained in the gas in the mixing joint.

[0036] Effects of the Invention

[0037] According to the present invention, it is possible to provide a blow-by gas treatment device capable of more reliably suppressing freezing or condensation of water vapor contained in gas separated from blow-by gas, and an engine having the blow-by gas treatment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a cross-sectional view showing an engine including the blow-by gas treatment device according to the embodiment of the present invention.

[0039] Figure 2 It is a cross-sectional view taken along the XZ plane, showing a configuration example of the blow-by gas treatment device according to the present embodiment.

[0040] Figure 3 This is a perspective view of an engine including the blow-by gas treatment device according to the present embodiment, as viewed from obliquely above.

[0041] Figure 4 This is a perspective view of an engine including the blow-by gas treatment device according to the present embodiment, as viewed from obliquely above.

[0042] Figure 5 It is a perspective view showing a configuration example of the blow-by gas mixing joint and the heating device according to the present embodiment.

[0043] Figure 6 It is a perspective view showing a configuration example of the blow-by gas mixing joint and the heating device according to the present embodiment.

[0044] Figure 7 It is an exploded perspective view showing a configuration example of the blow-by gas mixing joint and the heating device according to the present embodiment.

[0045] Figure 8 It is a cross-sectional view showing a structural example of the blow-by gas mixing joint according to the present embodiment.

[0046] Fig. 9 It is a perspective view showing a structural example of another embodiment (the first embodiment) of the present invention.

[0047] Fig.10 It is a perspective view showing a structural example of another embodiment (the first embodiment) of the present invention.

[0048] Fig.11 It is a schematic cross-sectional view showing a structural example of another embodiment (the second) of the present invention. DETAILED DESCRIPTION

[0049] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0050] In addition, the embodiments described below are preferred specific examples of the present invention, and therefore various technically preferred limitations are added, but as long as the description of the present invention is not particularly limited in the following description, the scope of the present invention is not limited to these modes. In addition, in each of the drawings, the same structural members are marked with the same reference numerals and detailed descriptions are appropriately omitted.

[0051] Figure 1 It is a cross-sectional view showing an engine including the blow-by gas treatment device according to the embodiment of the present invention.

[0052] Figure 1 The engine 1 shown is an internal combustion engine, such as an industrial diesel engine. The engine 1 is a multi-cylinder engine such as a supercharged high-output three-cylinder engine or a four-cylinder engine with a turbocharger. The engine 1 is mounted on industrial machinery such as construction machinery and agricultural machinery. In addition, the engine 1 can constitute a hybrid drive device by combining a rechargeable power supply battery for driving and an electric motor for driving.

[0053] The engine 1 includes a cylinder block 2, a cylinder head 3, a cylinder head cover 4, an oil pan 7, and a blow-by gas treatment device 100. The cylinder head 3 is mounted on the cylinder block 2. The cylinder head cover 4 is mounted on the cylinder head 3. The cylinder block 2 includes an upper cylinder 5 and a lower crankcase 6. The oil pan 7 is disposed at the lower part of the crankcase 6. The piston 8 is disposed in the cylinder 5. The crankshaft 9 is disposed to penetrate the crankcase 6. The piston 8 is connected to the crankshaft 9 via a connecting rod 10.

[0054] like Figure 1 As shown, the cylinder 5 has a valve cam chamber 11. The valve cam chamber 11 accommodates a valve cam shaft 12. A tappet 13 can move up and down along a tappet guide hole 14. The lower portion of the tappet 13 is placed on the valve cam shaft 12. A push rod 15 passes through an insertion hole 16. A rocker arm 17 is arranged in the cylinder head cover 4. The upper end portion of the push rod 15 abuts against the rocker arm 17.

[0055] The rocker arm 17 urges the upper end of the push rod 15 by the spring 18. The intake valve 19 and the exhaust valve 20 move up and down by the power transmitted through the push rod 15 and the rocker arm 17 by the rotation of the valve camshaft 12, thereby opening and closing the intake port and the exhaust port respectively.

[0056] like Figure 1 As shown, for example, the oil outflow hole 21 is provided in the tappet 13. The oil drop hole 22 is provided from the valve cam chamber 11 to the crankcase 6. Thus, the insertion hole 16, the interior of the tappet 13, the oil outflow hole 21, the valve cam chamber 11, and the oil drop hole 22 constitute an oil return path 99. The oil return path 99 enables the oil in the cylinder head cover 4 to return to the oil pan 7 through the crankcase 6. Each cylinder of the cylinder head 3 is connected to the intake passage 30 and the exhaust passage 31.

[0057] like Figure 1 As shown, blowby gas BG may be generated in at least one of the compression stroke and the combustion stroke of the engine 1. The blowby gas BG is generated by Figure 1 The gas flowing into the crankcase 6 through the gap between the piston 8 and the cylinder 5 shown in the figure contains mist of unburned fuel components, burned gas components, oil, etc. The blowby gas BG leaking from the gap between the cylinder 5 and the piston 8 to the crankcase 6 rises into the cylinder head cover 4 through, for example, the oil return path 99. That is, if the blowby gas BG leaks from the gap between the cylinder 5 and the piston 8 to the crankcase 6, it penetrates into the cylinder head cover 4 through, for example, the oil drop hole 22 of the oil return path 99 as the blowby gas path, the valve cam chamber 11, the oil outflow hole 21 of the tappet 13, and the insertion hole 16. In addition, the above-mentioned oil return path 99 is an example of a blowby gas passage path. The blowby gas passage path is not limited to the above-mentioned oil return path 99.

[0058] like Figure 1 As shown, the blow-by gas treatment device 100 is provided in the cylinder head cover 4. The blow-by gas treatment device 100 has a function of separating the blow-by gas BG into oil OL (see Figure 2 ) and the gas (treated gas) G (refer to Figure 2 ). For example, the gas G contained in the blow-by gas BG is transported to the pipe 41 connected to the intake system outside the cylinder head cover 4 via the blow-by gas treatment device 100. For example, the gas G contained in the blow-by gas BG is, for example, an unburned gas component and a combustion gas component obtained by removing the oil OL and the mist of the oil OL from the blow-by gas BG. In addition, the oil (lubricant component) OL is recovered to the oil pan 7 through, for example, the cylinder head cover 4, the inside of the cylinder head 3, and the oil return path 99.

[0059] Figure 1 The connecting pipe 50T and the pipe 41 of the intake pipe 50 shown are connected to each other by a blow-by gas mixing joint (an example of a mixing joint) 70. If new intake air AR is sucked into the intake pipe 50, it enters the main pipe 71 of the blow-by gas mixing joint 70 through the air filter 52 and the connecting pipe 50T. On the other hand, the gas G after the oil OL is separated from the blow-by gas BG by the blow-by gas treatment 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 treatment device 100 through the pipe 41. As a result, the new intake air AR and the gas G are mixed with each other in the blow-by gas mixing joint 70 to become the intake air B.

[0060] On the other hand, the exhaust gas from the exhaust passage 31 is supplied to the turbine 62 of the turbocharger 60, so that the turbine 62 and the compressor 61 rotate at high speed. The mixed intake air B is supplied to the compressor 61 of the turbocharger 60 and compressed. The compressed intake air C is supplied to the intake passage 30 of the intake system.

[0061] Next, a configuration example of the blow-by gas treatment device according to the present embodiment will be described with reference to the drawings.

[0062] Figure 2 It is a cross-sectional view taken along the XZ plane, showing a configuration example of the blow-by gas treatment device according to the present embodiment.

[0063] Here, Figure 1 and Figure 2 The X direction shown is Figure 1 The front-rear direction of the engine 1 shown is the axial direction of the crankshaft 9. The Y direction is the left-right direction of the engine 1. The Z direction is the up-down direction of the engine 1. The X, Y, and Z directions are orthogonal to each other.

[0064] like Figure 1 and Figure 2 As shown, the blow-by gas treatment device 100 is also called a breather device or a breather, and includes a main structure portion 101, an outlet portion 40, and a blow-by gas mixing joint 70. The main structure portion 101 is disposed in the cylinder head cover 4. The outlet portion 40 and the blow-by gas mixing joint 70 are provided to be exposed to the outside of the cylinder head cover 4. The main structure portion 101 can separate the blow-by gas BG into oil OL and gas G, and guide the oil OL and gas G in different paths.

[0065] like Figure 2 As shown in FIG. 1 , the main structure portion 101 is disposed in the cylinder head cover 4. The outlet portion 40 is disposed so as to protrude upward from the cylinder head cover 4. Figure 2 As shown, the outlet portion 40 is disposed at, for example, a substantially central position CP in the X direction, ie, the front-rear direction, of the main structural portion 101. A detailed configuration example of the outlet portion 40 will be described after a detailed configuration example of the main structural portion 101 is described.

[0066] First, refer to Figure 1 and Figure 2 A configuration example of the main configuration portion 101 of the blow-by gas treatment device 100 will be described.

[0067] like Figure 1 and Figure 2 As shown, the main structure 101 is accommodated in the cylinder head cover 4. Specifically, the cylinder 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 structure 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. Figure 2As shown, the main structure portion 101 introduces 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 structure portion 101 guides the oil OL and the gas G in different paths to prevent the oil OL and the gas G separated from the blow-by gas BG from leaking to the outside of the engine 1. Therefore, the cylinder head cover 4 is held in the cylinder head 3 in a state where the inside of the cylinder head cover 4 is kept airtight with respect to the outside of the cylinder head cover 4. Thus, 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.

[0068] like Figure 2 As shown, the main structure portion 101 generally includes a first blow-by gas introduction portion 111, a second blow-by gas introduction portion 112, a separation portion 330, a first oil guide groove portion 151, a second oil guide groove portion 152, a first oil drain portion 161, and a second oil drain portion 162. The first oil guide groove portion 151 and the second oil guide groove portion 152 are each an example of an “oil guide portion”. The first oil drain portion 161 and the second oil drain portion 162 are each an example of an “oil drain portion”.

[0069] like Figure 2 As shown, the main structure portion 101 includes a partition wall portion 200, a guide wall portion 203, and a guide plate 295 to constitute the above-mentioned structural members. The partition wall portion 200 is arranged along the XY plane in the cylinder head cover 4, that is, arranged horizontally, to separate the lower area 4P and the upper areas 4Q and 4R of the cylinder head cover 4. Therefore, the lower area 4P and the upper areas 4Q and 4R become independent spaces.

[0070] like Figure 2 As shown, the guide wall portion 203 reliably guides only the treated gas G, that is, the gas G after the mist of the oil OL separated 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 cylinder head cover 4, and separates the upper area 4Q and the upper area 4R. Therefore, the upper area 4Q and the upper area 4R are independent spaces from each other.

[0071] Next, refer to Figure 2 The first blow-by gas introduction portion 111 and the second blow-by gas introduction portion 112 will be described.

[0072] The first blow-by gas introduction portion 111 and the second blow-by gas introduction portion 112 are holes formed by the partition wall portion 200 and the guide plate 295, and introduce the blow-by gas BG. The partition wall portion 200 is divided into the first guide lower surface portion 231 side and the second guide lower surface portion 232 side with the separation portion 330 as the center. The first blow-by gas introduction portion 111 is provided at a position close to the front surface portion 4B (i.e., the front side of the engine 1), and the blow-by gas BG is introduced from the front side. In addition, the second blow-by gas introduction portion 112 is provided at a position close to the rear surface portion 4C (i.e., the rear side of the engine 1), and the blow-by gas BG is introduced from the rear side.

[0073] Figure 2 The guide plate 295 shown 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.

[0074] like Figure 1 As shown, if the blow-by gas BG rising in the crankcase 6 reaches Figure 2 The lower area 4P of the cylinder head cover 4 shown in FIG. 1 is introduced into between the first guide lower surface portion 231 of the partition wall portion 200 and the guide plate 295 through the first blowby gas introduction portion 111, and is guided toward the separation portion 330. Alternatively, the blowby gas BG is introduced into between the second guide lower surface portion 232 and the guide plate 295 through the second blowby gas introduction portion 112, and is guided toward the separation portion 330. Figure 2 As shown by the arrow, the blowby gas BG reaches the impactor 120 of the separation portion 330 located at the center position RP in the front-rear direction, that is, the X direction.

[0075] Next, refer to Figure 2 The separation unit 330 will be described.

[0076] Figure 2 The separator 330 shown is also called an impact separator, and includes an impactor 120, a filter 130, and a collision plate 133, and is disposed between the first blowby gas introduction portion 111 and the second blowby gas introduction portion 112 in the front-to-rear direction of the engine 1. More specifically, the separator 330 is disposed at a central portion, i.e., a central position RP, between the first oil drain portion 161 and the second oil drain portion 162 in the front-to-rear direction of the engine 1.

[0077] The impactor 120 has the function of a nozzle or an orifice. The throttle hole 121 of the impactor 120 is a so-called longitudinal throttle hole in which the axial direction of the throttle hole 121 is along the vertical direction or the up-down direction as the Z direction. The impactor 120 is a flow rate increasing operation part that increases the flow rate of the blowby gas BG by causing the blowby gas BG to pass upward along the throttle hole 121. The impactor 120 is arranged at the center position RP in the X direction of the partition wall part 200. As a result, the blowby gas BG introduced by the first blowby gas introduction part 111 and the blowby gas BG introduced by the second blowby gas introduction part 112 are equally guided to the impactor 120. The impactor 120 guides the blowby gas BG to the filter 130 on the basis of increasing the flow rate of the blowby gas BG flowing into the throttle hole 121.

[0078] like Figure 2 As shown, the filter 130 is replaceably mounted on the partition wall portion 200. The filter 130 is a member for improving the performance of separating the oil OL from the blowby gas BG (i.e., the separation performance of the oil OL), and is made of materials such as glass wool and steel wool. However, the material of the filter 130 is not limited thereto. The filter 130 is arranged between the collision plate 133 and the impactor 120. That is, the impactor 120 as the flow rate increase operation unit is arranged on the lower surface of the filter 130. The collision plate 133 is arranged on the upper surface of the filter 130.

[0079] For example, the collision plate 133 is a metal plate and extends in the horizontal direction. The collision plate 133 separates the blow-by gas BG into oil OL and mist gas G not containing oil OL by causing the blow-by gas BG passing through the filter 130 to collide with the blow-by gas BG having a higher flow rate. The blow-by gas BG having a higher flow rate collides with the collision plate 133 while passing through the filter 130 to remove foreign matter, thereby separating the oil OL and mist gas G not containing oil OL. Then, the gas G separated from the blow-by gas BG by the separator 330 is discharged from the filter 130.

[0080] As described above, the guide wall portion 203 is provided between the partition wall portion 200 and the upper surface portion 4A of the cylinder head cover 4. Therefore, the mist gas G not containing the oil OL discharged from the filter 130 is guided by the guide wall portion 203, passes through the passage 135 of the upper region 4Q, and is guided toward the outlet portion 40. The guide wall portion 203 is arranged in the cylinder head cover 4, and can guide the gas G separated by the separation portion 330 toward the outlet portion 40.

[0081] On the other hand, the oil OL separated from the blowby gas BG by the separator 330 falls through the filter 130 and falls on the upper surface of the impactor 120. The oil OL falling 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 151 and the second oil guide groove 152.

[0082] The separation unit 330 is located at Figure 2 The separation portion 330 is located at the center position RP in the X direction of the cylinder head cover 4, and functions as a gathering portion capable of gathering the blow-by gas BG from the front side and the rear side to the center portion in the X direction. As described above, the separation portion 330 is located at the center position RP in the X direction of the cylinder head cover 4, and therefore, the blow-by gas BG can be gathered from the front side and the rear side in the X direction to the center portion in the cylinder head cover 4, and separated into the oil OL and the mist gas G not containing the oil OL.

[0083] Next, refer to Figure 2 The first oil guide groove portion 151 and the second oil guide groove portion 152 will be described.

[0084] Figure 2 The first oil guide groove portion 151 shown is in the shape of a groove, and is provided from the front surface portion 4B of the cylinder 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 cylinder head cover 4. Similarly, the second oil guide groove portion 152 is in the shape of a groove, and is provided from the rear surface portion 4C of the cylinder 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 cylinder head cover 4. The first oil guide groove portion 151 and the second oil guide groove portion 152 guide the oil OL separated from the blowby 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”. Figure 1 When the engine 1 is tilted forward, the oil OL discharged from the filter 130 can be guided forward in the direction X1 and guided to the first oil discharge portion 161 on the front side. Similarly, the second oil guide groove 152 is a specific structural example of the "second oil guide portion". Figure 1 When the engine 1 is tilted toward the rear side, the oil OL discharged from the filter 130 can be guided toward the rear as shown in the direction X2 and guided to the second oil discharge portion 162 at the rear side.

[0085] In addition, the first oil guide groove 151 and the second oil guide groove 152 may be connected to each other. In this case, the portion of the oil guide groove that is arranged from the filter 130 to the front side of the engine 1 is called the first oil guide groove 151, and the portion that is arranged from the filter 130 to the rear side of the engine 1 is called the second oil guide groove 152.

[0086] Next, refer to Figure 2 The first oil discharge portion 161 and the second oil discharge portion 162 will be described.

[0087] The first oil drain portion 161 is provided at the front side of the engine 1, for example, in a cylindrical shape. The first oil drain portion 161 is provided in the cylinder head cover 4 in a position in front of the first guide lower surface portion 231 of the partition wall portion 200 and in a downward direction as the Z1 direction. The first oil drain portion 161 has a check valve, temporarily stores the oil OL guided by the first oil guide groove portion 151, and discharges it into the engine 1. Similarly, the second oil drain portion 162 is provided at the rear side of the engine 1, for example, in a cylindrical shape. The second oil drain portion 162 is provided in the cylinder head cover 4 in a position in the rear of the second guide lower surface portion 232 of the partition wall portion 200 and in a downward direction as the Z1 direction. The second oil drain portion 162 has a check valve, temporarily stores the oil OL guided by the second oil guide groove portion 152, and discharges it into the engine 1.

[0088] Thus, when the engine 1 is tilted toward the front, the oil OL separated from the blow-by gas BG by the separation portion 330 is guided toward the X1 direction by the first oil guide groove portion 151, and is temporarily stored in the first oil discharge portion 161, and is then discharged toward the Z1 direction through the first oil discharge portion 161. Similarly, when the engine 1 is tilted toward the rear, the oil OL separated from the blow-by gas BG by the separation portion 330 is guided toward the X2 direction by the second oil guide groove portion 152, and is temporarily stored in the second oil discharge portion 162, and is then discharged toward the Z1 direction through the second oil discharge portion 162. In the cylinder head cover 4, the oil OL discharged from the first oil discharge portion 161 and the second oil discharge portion 162 is discharged, for example, from Figure 1 The cylinder head cover 4 shown is recovered to the oil pan 7 through the above-mentioned oil return path 99. Alternatively, the discharged oil OL can also be recovered to, for example, an oil container not shown. Thus, the oil OL discharged from the first oil discharge portion 161 and the second oil discharge portion 162 is discharged into the engine 1 without leaking to the outside of the engine 1.

[0089] Next, refer to Figure 2 A configuration example of the outlet portion 40 of the blow-by gas treatment device 100 will be described.

[0090] As mentioned earlier, Figure 2 The outlet portion 40 shown is provided in the cylinder head cover 4 so as to protrude in the Z direction. Specifically, the outlet portion 40 is provided so as to protrude outward from the upper surface portion 4A of the cylinder head cover 4. The outlet portion 40 is arranged at a position CP substantially in the X direction, i.e., the front-rear direction, of the main structural portion 101 of the cylinder head cover 4, for example.

[0091] like Figure 2As shown in FIG. 1 , the outlet portion 40 includes a pressure regulating valve (diaphragm) 350 and a container body 750, and regulates the pressure of the gas G at a position CP, for example, substantially in the center of the engine 1, and delivers only the gas G guided from the main structural portion 101 to the piping 41 of the intake system 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 piping 41, and burn it again. Thus, the gas G separated from the blow-by gas BG is prevented from being discharged to the outside of the engine 1, and the environmental performance of the engine 1 can be improved.

[0092] The pressure regulating valve 350 regulates the pressure between the interior of the engine 1 and the intake system of the engine 1, and inhibits the new intake air AR from flowing into the engine 1 via the blow-by gas mixing joint 70 and the pipe 41 of the intake system ( Figure 1 Reference).

[0093] like Figure 2 As shown, the container body 750 is indirectly fixed to the upper surface portion 4A of the cylinder head cover 4 via the outlet mounting portion 700, and holds the pressure regulating valve 350. In addition, the container body 750 may be directly fixed to the upper surface portion 4A of the cylinder head cover 4 without passing through the outlet mounting portion 700. Alternatively, the outlet mounting portion 700 may be a part of the cylinder head cover 4, and may be formed to bulge outward from the upper surface portion 4A of the cylinder head cover 4 with the through hole 680 for gas discharge provided in the cylinder head cover 4 as the center.

[0094] The gas discharge through hole 680 is circularly formed through the upper surface portion 4A of the cylinder head cover 4 in the Z direction. That is, the central axis of the gas discharge through hole 680 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 therethrough.

[0095] The container body 750 is also called a spacer, etc., and is provided on the outlet mounting portion 700. The container body 750 can temporarily accommodate the gas G coming up from the cylinder head cover 4 through the through hole 680 of the outlet mounting portion 700, and discharge the gas G to the cylinder head cover 4 through the pipe 41. Figure 1 The illustrated intake system of the engine 1 is supplied with gas G. The container body 750 has a gas flow path 42. The gas flow path 42 guides the gas G, which passes through the through hole 680 and further passes through the pressure regulating valve 350, to the intake system of the engine 1 through the pipe 41.

[0096] Next, refer to Figure 3 A configuration example of the engine 1 and the blow-by gas treatment device 100 according to the present embodiment will be described.

[0097] Figure 3 and Figure 4 This is a perspective view of an engine including the blow-by gas treatment device according to the present embodiment, as viewed from obliquely above.

[0098] Figure 4 The enlarged view shows Figure 3 A portion A1 of engine 1.

[0099] like Figure 3 and Figure 4 As shown, the outlet portion 40 of the blowby gas treatment device 100, the blowby gas mixing joint 70 and the heating device 500 are disposed outside the cylinder head cover 4 of the engine 1. The outlet portion 40 of the blowby gas treatment device 100 protrudes from the upper surface portion 4A of the head cover 4 to the outside and is fixed.

[0100] like Figure 3 and Figure 4 As shown, the heating device 500 is provided in the sub-pipe 72 of the blow-by gas mixing joint 70. The heating device 500 includes: a heat storage unit 510 provided in the vicinity of the connection position with the main pipe 71 in the sub-pipe 72; and an electric heater 520 provided in the heat storage unit 510. The heat storage unit 510 plays a role of storing heat generated by the electric heater 520 and effectively transferring the heat to the connection position between the sub-pipe 72 and the main pipe 71. The heat storage unit 510 can be provided integrally with the blow-by gas mixing joint 70. Thus, it is not necessary to connect the heat storage unit 510 to the blow-by gas mixing joint 70 separately. In addition, by being formed of the same material, heat can be continuously transferred from the heat storage unit 510 to the blow-by gas mixing joint 70.

[0101] Figure 5 and Figure 6 It is a perspective view showing a configuration example of the blow-by gas mixing joint and the heating device according to the present embodiment. Figure 5 1 shows a perspective view of the heating device 500 as seen from one side, Figure 6 A perspective view from a side opposite to the one side of the heating device 500 is shown.

[0102] Figure 7 It is an exploded perspective view showing a configuration example of the blow-by gas mixing joint and the heating device according to the present embodiment.

[0103] The axial direction CL1 of the main pipe 71 of the blow-by gas mixing joint 70 is orthogonal to the axial direction CL2 of the sub-pipe 72. The heat storage unit 510 of the heating device 500 includes: a first portion 511 in contact with the outer surface of the sub-pipe 72; and a second portion 512 extending from the first portion 511 to the outer surface of the main pipe 71. The first portion 511 as the heat storage unit 510 can be arranged to be in contact with at least half of the outer surface of the sub-pipe 72 when viewed in the extension direction (axial direction CL2) of the sub-pipe 72. In addition, the second portion 512 extending from the first portion 511 can be arranged to be in contact with at least half of the outer surface of the main pipe 71 when viewed in the extension direction (axial direction CL1) of the main pipe 71. That is, the heat storage unit 510 is arranged to surround half of the outer surface of each of the main pipe 71 and the sub-pipe 72 at the connection position of the main pipe 71 and the sub-pipe 72 of the blow-by gas mixing joint 70.

[0104] In addition, if Figure 7 As shown, a flat first surface FP is provided on the first part 511 of the heat storage part 510, and an electric heater 520 is installed on the first surface FP. The electric heater 520 has a frame 521 for accommodating a heating element, a mounting member 522 extending from the frame 521, and a connector connecting portion 523 for connecting a connector (not shown in the figure) for supplying power to the heating element. For example, the electric heater 520 is fastened to the first surface FP by passing a bolt 525 through a hole 524 provided in the mounting member 522. As a result, the electric heater 520 is in surface contact with the flat first surface FP of the first part 511, so that the electric heater 520 can be stably fixed, and the heat generated by the electric heater 520 can be effectively transferred to the first part 511.

[0105] Preferably, the electric heater 520 has a PTC (Positive Temperature Coefficient) heater. Since the PTC heater has a positive temperature characteristic, it is possible to perform self-control of the temperature. Therefore, there is no need to provide a separate control unit for the electric heater 520, thereby enabling simplification of the device structure. The PTC heater is housed in the frame 521 and receives power via a connector (not shown in the figure) connected to the connector connection portion 523. By using the electric heater 520, even if the engine is in a low temperature state, it can be immediately heated by powering on, thereby enabling rapid suppression of freezing and condensation of the blowby gas mixing joint 70.

[0106] Figure 8 It is a cross-sectional view showing a structural example of the blow-by gas mixing joint according to the present embodiment. Figure 8The figure shows a cross-sectional view when the sub-pipe 72 is cut along the extension direction at the center position of the sub-pipe 72. The heat storage unit 510 is provided so as to extend from the sub-pipe 72 to both sides near the connection portion between the sub-pipe 72 and the main pipe 71 of the blow-by gas mixing joint 70 and extend to the main pipe 71. In the heat storage unit 510, the sub-pipe 72 side is the first portion 511, and the main pipe 71 side is the second portion 512, based on the connection position JP between the sub-pipe 72 and the main pipe 71.

[0107] By installing the electric heater 520 in such a heat storage unit 510, the heat generated by the electric heater 520 can be transferred to the heat storage unit 510 and stored, and the heat can be transferred from the sub-pipe 72 to the main pipe 71. That is, compared with the case of directly heating the main pipe 71 and the sub-pipe 72, the heat capacity is increased by providing the heat storage unit 510, so that it is easy to maintain the appropriate temperature when heating the main pipe 71 and the sub-pipe 72.

[0108] (Description of Process for Preventing Freezing or Condensation of Gas G Flowing in Sub-pipe 72 of Blow-by Gas Mixing Joint 70)

[0109] Next, a description will be given of a process for preventing the freezing or condensation of the gas G flowing in the sub-pipe 72 of the blow-by gas mixing joint 70 .

[0110] First of all, Figure 2 The flow of the gas G separated from the blow-by gas BG by the separation unit 330 shown will be described. Figure 2 The gas G separated from the blow-by gas BG by the separation unit 330 shown in the figure 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. Thereafter, when the pressure inside the engine 1 rises to a pressure higher than a predetermined pressure 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 is opened. In this way, the gas G guided to the pressure regulating valve 350 is guided to the intake system of the engine 1 through the pipe 41.

[0111] Here, if Figure 3As shown, the blow-by gas mixing joint 70 of the blow-by gas treatment device 100 is provided to protrude toward the outside on the upper surface portion 4A of the cylinder 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 in a low temperature state, the water vapor contained in the gas G freezes or condenses in the blow-by gas mixing joint 70, and thus the sub-pipe 72 may be blocked. In this way, the gas path from the outlet portion 40 of the blow-by gas treatment device to the pipe 41 of the intake system of the engine and to the blow-by gas mixing joint 70 may be blocked. If the gas path is blocked, the internal pressure of the engine rises, which may cause, for example, the oil seal provided in the crankcase to be damaged or curled, and oil leakage may occur. In addition, if the gas path is blocked, the internal pressure of the engine rises, which may cause the oil level gauge to be pulled out of the oil level gauge guide, and oil leakage may occur. Further, if the gas path is blocked, the internal pressure of the engine rises, and the turbocharger may suck in oil.

[0112] In order to prevent such clogging of the gas path, the blow-by gas treatment device 100 of the present embodiment and the engine 1 having the blow-by gas treatment device 100 are provided. Figure 3 That is, heat is generated by the electric heater 520 of the heating device 500, and the heat is stored in the heat storage unit 510 and transferred to the sub-pipe 72 and the main pipe 71. By energizing the electric heater 520 when starting the engine 1, heat can be transferred to the gas G flowing in the sub-pipe 72 even before the warm-up operation of the engine 1 is completed, thereby increasing the temperature of the gas G flowing in the sub-pipe 72.

[0113] like Figure 5 and Figure 6 As shown, the heat storage unit 510 includes a first portion 511 in contact with the outer surface of the sub-pipe 72 and a second portion 512 extending from the first portion 511 to the outer surface of the main pipe 71. Therefore, the heat generated by the heating device 500 and stored in the heat storage unit 510 can be transferred to the sub-pipe 72 through the first portion 511, and transferred to the main pipe 71 through the second portion 512. Thus, the connection portion between the sub-pipe 72 and the main pipe 71 in the blow-by gas mixing joint 70 can be effectively heated.

[0114] Furthermore, the first portion 511 of the heat storage unit 510 is in contact with at least half of the outer surface of the sub-pipe 72, and the second portion 512 is in contact with at least half of the outer surface of the main pipe 71, thereby enabling heat to be transferred from the heat storage unit 510 to a wide range of the connection portion between the sub-pipe 72 and the main pipe 71. In addition, by storing heat in the heat storage unit 510 and transferring the heat to the sub-pipe 72 and the main pipe 71, and by including a PTC heater as the electric heater 520, heat can be stably transferred at a temperature controlled by the PTC heater.

[0115] (Other embodiments of the present invention: 1)

[0116] Fig. 9 and Fig.10 It is a perspective view showing a structural example of another embodiment (the first embodiment) of the present invention. Fig. 9 4 shows a perspective view of the heating device 500 as viewed from one side. Fig.10 A perspective view viewed from the side opposite to the heating device 500 is shown.

[0117] like Fig. 9 and Fig.10 As shown, in another embodiment (the first embodiment) of the present invention, there is further provided a cooling water flow path 400 for guiding cooling water of the engine 1. The cooling water flow path 400 is provided on the side of the sub-pipe 72 opposite to the heating device 500. That is, the heating device 500 is provided on one side of the outer surface of the sub-pipe 72, and the cooling water flow path 400 is provided on the other side.

[0118] The cooling water flow path 400 is a metal pipe having a circular cross section for passing cooling water. The cooling water flow path 400 includes an upstream path 461, a downstream path 462, and a heat exchange member 380. One end of the upstream path 461 of the cooling water flow path 400 is connected to the exhaust gas recirculation device 80 (see Figure 3 )connect.

[0119] The exhaust gas recirculation device 80 has an EGR (Exhaust Gas Recirculation) cooler and an EGR valve, and returns a portion of the exhaust gas flowing in the exhaust system of the engine 1 to the intake system of the engine 1 as exhaust return gas. Specifically, one end of the upstream path 461 is connected to a water jacket (not shown) provided in the EGR valve of the exhaust gas recirculation device 80, and a portion of the cooling water flowing in the water jacket of the EGR valve is taken out and guided to the other end of the upstream path 461. For example, the cooling water used is Figure 2 The LLC (Long Life Coolant) for cooling the cylinder block 2 and the cylinder head 3 shown in the figure becomes a temperature of about 70° C. to 80° C. after the warm-up operation of the engine 1 is completed.

[0120] like Fig. 9 and Fig.10 As shown, the other end of the upstream path 461 is connected to one end of the heat exchange member 380. The heat exchange member 380 is a cylindrical member made of metal, for example, and is provided as a linear member. The heat exchange member 380 is provided to be mechanically and thermally integrated with the sub-pipe 72 of the blowby gas mixing joint 70.

[0121] By providing such a cooling water flow path 400, the heat of the cooling water passing through the cooling water flow path 400 can be effectively transferred to the gas G passing through the sub-pipe 72 of the blow-by gas mixing joint 70. Thus, the blow-by gas mixing joint 70 can be heated from both sides by the heat from the heating device 500 and the heat of the cooling water passing through the cooling water flow path 400, thereby further reliably preventing the freezing and condensation of water vapor contained in the gas G at a low temperature.

[0122] Here, the engine 1 has a suction-type cooling fan (an example of a fan) on the front side of the engine 1. When the engine 1 is in operation, the cooling fan generates cooling air WD toward the rear of the engine 1 in order to cool the engine 1. Assuming that the cooling air WD generated by the cooling fan cools the heated cooling water passing through the upstream path 461, it is difficult for the cooling water to heat the gas G in the sub-pipe 72 passing through the blowby gas mixing joint 70 via the heat exchange member 380. Therefore, it may not be possible to reliably suppress the freezing or condensation of water vapor contained in the gas G in the blowby gas mixing joint 70.

[0123] 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 wind WD of the cooling fan, the cooling water flow path 400 is arranged at a position avoiding the wind generated by the cooling fan of the engine 1. Specifically, an example of the configuration shape of the upstream path 461 is designed as follows. The upstream path 461 is arranged at a position avoiding the cooling wind WD generated by the cooling fan near the area from the outlet portion 40 to the heat exchange member 380. For example, the upstream path 461 is arranged on the downstream side of the cooling wind WD relative to other parts (for example, the heating device 500) so that the cooling wind WD of the cooling fan does not directly contact the upstream path 461.

[0124] Thus, the cooling air WD is prevented from directly contacting the upstream path 461, thereby suppressing the cooling of the heated cooling water passing through the upstream path 461 by the cooling air WD. That is, the cooling of the heated cooling water passing through the upstream path 461 by the cooling air WD can be suppressed, thereby preventing the temperature of the cooling water from decreasing due to the cooling air WD. Furthermore, the cooling water can efficiently heat the gas G passing through the sub-pipe 72 of the blow-by gas mixing joint 70 via the heat exchange member 380, thereby further reliably suppressing the freezing or condensation of water vapor contained in the gas G in the blow-by gas mixing joint 70.

[0125] Moreover, the heat exchange component 380 of the cooling water flow path 400 itself is also arranged near the sub-pipe 72 of the blowby gas mixing joint 70 at a position away from the cooling air WD generated by the cooling fan. Specifically, the heat exchange component 380 is arranged on the rear side relative to the sub-pipe 72, that is, it is arranged on the downstream side of the cooling air WD relative to the sub-pipe 72. Therefore, the flow of the cooling air WD is blocked by the sub-pipe 72. Thus, the cooling air WD can be prevented from directly contacting the heat exchange component 380. Thus, the cooling water can efficiently heat the gas G in the sub-pipe 72 passing through the blowby gas mixing joint 70 via the heat exchange component 380, thereby further reliably suppressing the freezing or condensation of water vapor contained in the gas G in the blowby gas mixing joint 70.

[0126] (Other embodiments of the present invention: 2)

[0127] Fig.11 It is a schematic cross-sectional view showing a structural example of another embodiment (the second) of the present invention.

[0128] like Fig.11 As shown, in another embodiment (the second embodiment) of the present invention, at least a portion of the gradually increasing portion 721 of the wall thickness of the sub-pipe 72 is used as the heat storage portion 510. That is, the sub-pipe 72 has a gradually increasing portion 721 of the wall thickness gradually increasing from far to near the connection position. The gradually increasing portion 721 may be a portion of the sub-pipe 72 where the wall thickness increases conically, or may be a portion where the wall thickness of the sub-pipe 72 increases in stages. Fig.11 , an example is shown in which the wall thickness of the sub-pipe 72 increases in a tapered shape. The heat storage unit 510 includes at least a portion of the gradually increasing portion 721. The electric heater 520 is installed outside the gradually increasing portion 721 of the sub-pipe 72.

[0129] According to the present embodiment, since at least a portion of the gradually increasing portion 721 of the sub-pipe 72 is used as the heat storage unit 510, the heat generated by the electric heater 520 can be stored in the gradually increasing portion 721 and effectively transferred to the connection position of the sub-pipe 72 and the main pipe 71. In addition, since the gradually increasing portion 721 is a portion of the sub-pipe 72 whose wall thickness gradually increases toward the inside of the pipe, the heat storage unit 510 is less exposed to the outside, and is less likely to be affected by heat dissipation caused by the outside air. Therefore, the stored heat can be effectively transferred to the gas G flowing in the pipe of the sub-pipe 72.

[0130] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the scope of the claims. The structures of the above embodiments can be partially omitted, or can be arbitrarily combined in a manner different from the above.

[0131] Description of reference numerals:

[0132] 1: Engine, 2: Cylinder block, 3: Cylinder head, 4: Cylinder head cover, 4A: Upper surface, 4B: Front surface, 4C: Rear surface, 4D: Left and right surface, 4P: Lower area, 4Q: Upper area, 4R: Upper area, 5: Cylinder, 6: Crankcase, 7: Oil pan, 8: Piston, 9: Crankshaft, 10: Connecting rod, 11: Valve cam chamber, 12: Valve camshaft, 13: Tappet, 14: Tappet guide hole, 15: Push rod, 16: Insertion hole, 7: Rocker arm, 18: Spring, 19: Intake valve, 20: Exhaust valve, 21: Oil flow Outlet, 22: Oil drop hole, 30: Intake passage, 31: Exhaust passage, 40: Outlet, 41: Pipe, 42: Gas flow path, 50: Intake pipe, 50T: Connecting pipe, 52: Air filter, 60: Turbocharger, 61: Compressor, 62: Turbine, 70: Blow-by gas mixing joint, 71: Main pipe, 72: Sub-pipe, 80: Exhaust gas recirculation device, 99: Oil return path, 100: Blow-by gas treatment device, 101: Main structure, 111: First blow-by gas introduction part, 112: Second blow-by gas introduction part, 120: Impact , 121: orifice, 130: filter, 133: collision plate, 135: passage, 151: first oil guide groove, 152: second oil guide groove, 161: first oil discharge portion, 162: second oil discharge portion, 200: partition wall, 203: guide wall, 231: first guide lower surface portion, 232: second guide lower surface portion, 295: guide plate, 330: separation portion, 50: pressure regulating valve, 380: heat exchange member, 400: cooling water flow path, 461: upstream side path, 462: downstream side path, 500: heating device Position, 510: heat storage part, 511: first part, 512: second part, 520: electric heater, 521: frame, 522: mounting part, 523: connector connection part, 524: hole, 525: bolt, 680: through hole, 700: outlet mounting part, 721: increasing part, 750: container body, AR: new intake, B: intake air, BG: blowby, C: intake air, CL1: axial, CL2: axial, FP: first side, G: gas, JP: connection position, OL: oil, RP: central position, WD: cooling air.

Claims

1. A blow-by gas treatment device for treating blow-by gas generated in an engine, characterized in that: have: a mixing joint having a main pipe for introducing new intake air and a sub-pipe for introducing the gas after the blow-by gas is separated into oil and gas into the main pipe; as well as a heating device, disposed on the secondary pipe of the mixing joint; The heating device comprises: a heat storage unit provided in the vicinity of a connection position of the sub-pipe with the main pipe; and The electric heater is arranged in the heat storage part.

2. The blow-by gas treatment device according to claim 1, characterized in that: The secondary pipe has a gradually increasing portion with a wall thickness gradually increasing from a distance away from the connection position to a distance near the connection position; The heat storage portion includes at least a portion of the gradually increasing portion.

3. The blow-by gas treatment device according to claim 1, characterized in that: The heat storage unit has: A first portion in contact with an outer surface of the secondary pipe; and The second portion extends from the first portion to the outer surface of the main pipe.

4. The blow-by gas treatment device according to claim 3, characterized in that: The second portion is in contact with at least half of the circumference of the outer surface of the main pipe when viewed in the extending direction of the main pipe.

5. The blow-by gas treatment device according to claim 3, characterized in that: The first portion has a flat first surface; The electric heater is installed on the first surface.

6. The blow-by gas treatment device according to claim 3, characterized in that: The first portion and the second portion are integrally provided with the mixing joint.

7. The blow-by gas treatment device according to claim 1, characterized in that: The heat storage unit is in contact with at least a half circumference of the outer surface of the sub-pipe when viewed in the extending direction of the sub-pipe.

8. The blow-by gas treatment device according to claim 1, characterized in that: The blow-by gas treatment device further includes a cooling water flow path that guides cooling water of the engine and transfers heat to the gas flowing through the sub-pipe.

9. The blow-by gas treatment device according to claim 8, characterized in that: The cooling water flow path is arranged at a position away from wind generated by a fan of the engine.

10. The blow-by gas treatment device according to claim 1, characterized in that: The electric heater has a PTC (Positive Temperature Coefficient) heater.

11. An engine having a blow-by gas treatment device for treating blow-by gas generated in the engine, characterized in that: The blowby gas treatment device comprises: a mixing joint having a main pipe for introducing new intake air and a sub-pipe for introducing the gas after the blow-by gas is separated into oil and gas into the main pipe; as well as a heating device, disposed on the secondary pipe of the mixing joint; The heating device comprises: a heat storage unit provided in the vicinity of a connection position of the sub-pipe with the main pipe; and The electric heater is arranged in the heat storage part.

Images