JP2017044143A - Engine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine device with high reliability and high safety which can avoid closure of a pipe line in a confluent portion of blow-by gas leaked from a combustion chamber and intake air (outside air) due to icing even in use at a cold district, especially at a very cold district of -20°C or lower.SOLUTION: An engine device includes heating means (21, 22, 23, 24, 25, and 26) for raising a temperature in a mixing area of intake air flowing in blow-by gas mixing joints (20, 20A, 20B, and 20C) and blow-by gas introduced from a reducing hose (12), and cooling water is used as a heat source in the heating means.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to an engine device such as a diesel engine mounted as a power source in various power devices such as work vehicles, agricultural machines, generators, and refrigerators, and in particular, a blow-by gas reduction mechanism that reduces blow-by gas to an intake system. It is related with an engine apparatus provided with.

  In recent years, exhaust gas regulations for engine devices that are internal combustion engines have become stricter year by year, and various countermeasures have been proposed for engine devices in order to comply with exhaust gas regulations. As a countermeasure for exhaust gas in conventional diesel engines, etc., an exhaust gas recirculation (EGR) device that reduces a part of the exhaust gas to the intake side is installed to keep the combustion temperature low and in the exhaust gas. Measures have been taken to reduce the amount of NOx (nitrogen oxide). For example, a configuration in which an exhaust gas purification device used in a diesel engine is improved (for example, see Patent Document 1), or a configuration in which the number of parts of the blow-by gas reduction device is reduced and maintenance inspection work is simplified (for example, Patent Document 2). Have been proposed). Further, a technique has been proposed in which lubricating oil is separated from blow-by gas leaking from the combustion chamber, and the blow-by gas from which the lubricating oil has been separated is returned to the intake system and recirculated.

JP2013-13396A JP2013-148010A

  In the configuration in which the blow-by gas in the crankcase leaking from the combustion chamber is returned to the intake system, the blow-by gas contains moisture as well as the oil that is the lubricating oil, so use in cold regions, especially in extremely cold regions of -20 ° C or lower. Had a big problem. In cold regions, particularly in extremely cold regions of −20 ° C. or lower, the blow-by gas is rapidly cooled at the joint portion between the intake air (external air) and the blow-by gas, the moisture contained in the blow-by gas freezes, and the blow-by gas flows. The phenomenon of icing on the pipeline occurs. As a result, the blow-by gas conduit is blocked by ice, the pressure in the crankcase of the engine device increases, and the internal lubricating oil leaks. Furthermore, as a result of leakage of the lubricating oil, the lubricating oil is insufficient, and there is a possibility that the equipment (for example, the supercharger) is damaged.

  The present disclosure solves the above-described problems. Even in use in a cold region, particularly in an extremely cold region of −20 ° C. or less, a blow-by gas line leaking from the combustion chamber, particularly an intake air (external air: new) An object of the present invention is to provide a highly reliable and safe engine device that is not blocked by icing in the pipe line at the confluence portion between the gas and the blow-by gas.

One aspect according to the present disclosure is an engine apparatus having a blow-by gas reduction mechanism that recirculates blow-by gas leaking from a combustion chamber to an intake pipe through which intake air flows.
A reduction hose through which the blow-by gas from the combustion chamber flows;
A blow-by gas mixing joint for introducing the blow-by gas flowing through the reduction hose into the intake pipe;
A heating means for raising the intake air temperature in a mixed region of the intake air flowing through the blow-by gas mixing joint and the blow-by gas introduced from the reduction hose,
A cooling water in the engine device is used as a heating source in the heating means.

  According to the present disclosure, even in a cold region, particularly in an extremely cold region where the outside air temperature is −20 ° C. or less, the blow-by gas conduit leaking from the combustion chamber, in particular, the portion where the intake air and the blow-by gas merge is blocked with ice. Therefore, it is possible to provide a highly reliable and safe engine device.

The perspective view which shows the diesel engine of Embodiment 1 which concerns on this indication. The perspective view which shows the vicinity of the head cover which covers the upper surface part of the cylinder head in the diesel engine of Embodiment 1. FIG. The top view which looked at one part including the head cover in the diesel engine of Embodiment 1 from upper direction Sectional drawing of the direction orthogonal to the flow direction of the intake air in the blowby gas mixing joint in the diesel engine of Embodiment 1 Sectional drawing which cut | disconnected the blowby gas mixing joint in the diesel engine of Embodiment 1 along the flow direction of intake air Sectional drawing cut | disconnected along the intake direction of the blowby gas mixing joint in the diesel engine of Embodiment 2 which concerns on this indication Sectional drawing which shows the reduction | restoration hose etc. in the diesel engine of Embodiment 3 which concerns on this indication The perspective view which shows the blowby gas mixing joint in the diesel engine of Embodiment 4 which concerns on this indication. Sectional drawing cut along the intake direction of the blow-by gas mixing joint shown in FIG.

A first aspect according to the present disclosure is an engine apparatus having a blow-by gas reduction mechanism that recirculates blow-by gas leaking from a combustion chamber to an intake pipe through which intake air flows.
A reduction hose through which the blow-by gas from the combustion chamber flows;
A blow-by gas mixing joint for introducing the blow-by gas flowing through the reduction hose into the intake pipe;
A heating means for raising the intake air temperature in a mixed region of the intake air flowing through the blow-by gas mixing joint and the blow-by gas introduced from the reduction hose,
A cooling water in the engine device is used as a heating source in the heating means.

  The engine apparatus according to the first aspect of the present disclosure configured as described above includes a blow-by gas and intake air (outside air) leaking from the combustion chamber even in a cold region, particularly in an extremely cold region of −20 ° C. or less. Therefore, it is possible to prevent clogging of the pipe line in the mixed region by icing and to provide a highly reliable and safe engine device.

  In the engine device of the second aspect according to the present disclosure, the heating means in the first aspect is in a mixing region of the intake air flowing through the blow-by gas mixing joint and the blow-by gas introduced from the reduction hose. You may comprise so that the said cooling water may flow into the outer peripheral surface of the said blowby gas mixing joint. In the engine device of the second aspect according to the present disclosure configured as described above, the mixing region of the intake air flowing through the blow-by gas mixing joint and the blow-by gas introduced from the reduction hose is warmed. The icing is suppressed and the pipe is prevented from being blocked.

  According to a third aspect of the engine device of the present disclosure, the warming means in the first aspect is provided upstream of the blow-by gas introduction region introduced from the reduction hose in the blow-by gas mixing joint. You may comprise so that the said cooling water may flow into an outer peripheral surface. In the engine device according to the third aspect of the present disclosure configured as described above, the intake air on the upstream side from the introduction region of the blow-by gas introduced from the reduction hose in the blow-by gas mixing joint, for example, even in the use in a cold region Since it is warmed, icing on the pipeline in the mixing region is suppressed, and the pipeline is prevented from being blocked.

  According to a fourth aspect of the engine device of the present disclosure, the warming means in the first aspect includes an upstream side of the blow-by gas introduction region introduced from the reduction hose in the blow-by gas mixing joint, and The cooling water may be configured to flow on the outer peripheral surface on the downstream side. In the engine device according to the fourth aspect of the present disclosure configured as described above, for example, even in use in an extremely cold region, upstream and downstream from the introduction region of the blow-by gas introduced from the reduction hose in the blow-by gas mixing joint Since the intake air on the side is warmed, icing on the pipeline in the mixing region is suppressed, and the pipeline is prevented from being blocked.

  An engine device according to a fifth aspect of the present disclosure is configured such that the heating means in the first aspect includes a cooling water pipe disposed so as to warm the blow-by gas flowing through the reduction hose with the cooling water. May be. In the engine device according to the fifth aspect of the present disclosure configured as described above, for example, even in use in a cold region, the blow-by gas introduced from the reduction hose in the blow-by gas mixing joint is warmed. The icing on the pipeline is suppressed and the pipeline is prevented from being blocked.

  An engine device according to a sixth aspect of the present disclosure is a cooling water pipe in which the heating means in the first aspect is disposed upstream of a region where blow-by gas is introduced in the blow-by gas mixing joint. It may be configured. In the engine device according to the sixth aspect of the present disclosure configured as described above, for example, even in use in a cold region, the intake air on the upstream side from the region where the blow-by gas is introduced in the blow-by gas mixing joint is warmed. The icing on the pipe line in the mixing area is suppressed, and the pipe line is prevented from being blocked.

In the engine device of the seventh aspect according to the present disclosure, the heating means in the first aspect is configured by a member having thermal conductivity provided in at least a part of the blow-by gas mixing joint,
The heating means is a blow-by gas introduction pipe to which the reduction hose is connected;
The blow-by gas introduction pipe is fixed so as to conduct heat, and a spacer that is in close contact with the outer peripheral surface of the blow-by gas mixing joint,
It is good also as a structure provided with the cooling water pipe which closely arrange | positions so that heat conduction may be carried out to the said blow-by gas introduction pipe and the said spacer, and the said cooling water flows. In the engine device according to the seventh aspect of the present disclosure configured as described above, the mixing region where the blow-by gas is introduced in the blow-by gas mixing joint is warmed even in use in a cold region, for example. The icing on the road is suppressed and the pipe is prevented from being blocked.

  Hereinafter, embodiments according to the present disclosure will be described with reference to the accompanying drawings. The configuration of the present invention is not limited by the configuration described in the following embodiments. In the engine device of the present disclosure, a diesel engine will be described as an example in the following embodiment, but the present invention is not limited to the configuration of the diesel engine in the embodiment, and the technical idea described in the embodiment. It includes an engine device configured based on an equivalent technical idea.

(Embodiment 1)
A diesel engine as an engine device of Embodiment 1 according to the present disclosure will be described with reference to the accompanying drawings. In the figure, the direction of the arrow UP will be described as the upward direction.

  FIG. 1 is a perspective view showing an overall configuration of a diesel engine 1 according to Embodiment 1 of the present disclosure. FIG. 2 is a perspective view showing the vicinity of the head cover that covers the upper surface portion of the cylinder head in the diesel engine 1 of the first embodiment, and a part thereof is shown in cross section. The diesel engine 1 according to the first embodiment includes a continuously regenerative exhaust gas purification device 2.

  The diesel engine 1 of the first embodiment is provided with a blow-by gas reduction mechanism 3 (see FIG. 2) that recirculates the blow-by gas in the crankcase leaking from the combustion chamber to the intake system (intake pipe). A blow-by gas reduction mechanism 3 is provided on a head cover 10 that covers an intake valve and an exhaust valve provided on an upper surface portion of a cylinder head of the diesel engine 1. The blow-by gas reduction mechanism 3 has a gas pressure adjusting unit 4 formed by partially bulging upward the upper surface of the head cover 10. A blow-by gas intake chamber 5 into which blow-by gas leaked from the combustion chamber of the diesel engine 1 and the like and a blow-by gas in the blow-by gas intake chamber 5 are supplied to the inside of the gas pressure adjusting unit 4 through a gas pressure adjusting valve. A blow-by gas expansion chamber 6 is formed. When a lubricating oil component accumulates in the blow-by gas expansion chamber 6 on the bottom surface of the blow-by gas expansion chamber 6, the check valve rotates by the weight of the lubricating oil component and drops the lubricating oil component to the upper surface side of the cylinder head. For example, a leaf spring that bends downward due to weight is provided. As described above, the lubricating oil component accumulated in the blow-by gas expansion chamber 6 falls to the upper surface side of the cylinder head and is collected in the diesel engine.

  In the configuration of the first embodiment, since a check valve, which is a leaf spring, is provided on the bottom surface of the blow-by gas expansion chamber 6, the lubricating oil scatters from the upper surface side of the cylinder head toward the check valve. However, the scattered lubricating oil is prevented from entering the blow-by gas expansion chamber 6.

  In the blow-by gas expansion chamber 6, for example, a plurality of partition plates are provided to form a plurality of labyrinth-like passages, and when the blow-by gas swells in the plurality of labyrinth-like passages, a lubricating oil component in the blow-by gas Is a configuration in which is removed. The removed lubricating oil component accumulates on the bottom surface of the blow-by gas expansion chamber, and the leaf spring is bent by its own weight and falls to the upper surface side of the cylinder head, and is collected in the diesel engine.

  On the other hand, the blow-by gas from which the lubricating oil component has been removed in the blow-by gas expansion chamber 6 is introduced into the intake pipe via the conduit of the reduction hose 12 (see FIG. 2) connected to the exhaust port 11 of the blow-by gas expansion chamber 6. 13 (refer to FIG. 3 described later) is configured to be fed into the pipeline. An exhaust port 11 of the blow-by gas expansion chamber 6 is integrally formed with the head cover 10 and protrudes from the upper surface of the head cover 10.

  FIG. 3 is a plan view of a part including the head cover 10 in the diesel engine 1 of Embodiment 1 as viewed from above. FIG. 3 shows a state in which the exhaust port 11 of the blow-by gas expansion chamber 6 formed in the head cover 10 and the intake pipe 13 are connected by the reduction hose 12.

  An intake pipe 13 shown in FIG. 3 is an intake pipe through which intake air (external air: fresh air) flows toward a supercharger (turbocharger) 7 via an air cleaner (not shown). In the pipe 13, the intake air flows from top to bottom. A blow-by gas mixing joint 20 for introducing blow-by gas from the blow-by gas expansion chamber 6 in the head cover 10 into the intake pipe 13 is provided on the pipe line of the intake pipe 13. The reduction hose 12 connecting the blow-by gas mixing joint 20 connected to the intake pipe 13 and the exhaust port 11 of the blow-by gas expansion chamber 6 is formed of a flexible material having heat resistance and cold resistance, for example, a rubber material. Yes.

  FIG. 4 is a cross-sectional view of the blow-by gas mixing joint 20 in a direction orthogonal to the flow direction of the intake air. FIG. 4 shows a cross section including the center of a blow-by gas inlet 20b (described later) to which the reducing hose 12 having a circular cross section is joined. FIG. 5 is a cross-sectional view of the blow-by gas mixing joint 20 cut along the flow direction of intake air (intake direction).

  As shown in FIGS. 4 and 5, the blow-by gas mixing joint 20 has a three-way joint structure, and has a configuration in which a blow-by gas introduction port 20 b is provided in the intake passage 20 a connected to the pipe line of the intake pipe 13. One end of the reduction hose 12 is connected to the blow-by gas inlet 20b.

  In the diesel engine 1 according to the first embodiment, the blow-by gas mixing joint 20 is provided with a temperature sensor 14 (see FIG. 3), and detects the intake air temperature in the intake passage 20a. The temperature sensor 14 is inserted in a direction orthogonal to the intake direction of the intake passage 20a, and is held by a sensor holding portion 20c (see FIG. 4) that is led out from the outer peripheral surface of the intake passage 20a. In the configuration of the first embodiment, a holding plate (not shown) on which the temperature sensor 14 is mounted is screwed to the sensor holding unit 20c, and the temperature sensor 14 is held by the sensor holding unit 20c.

  In the configuration of the first embodiment, the temperature detection region of the temperature sensor 14 includes a surface orthogonal to the intake direction including a center line extending in the introduction direction of the blow-by gas introduction port 20b. That is, the temperature sensor 14 is provided in the vicinity of the blow-by gas inlet 20 b of the blow-by gas mixing joint 20.

  In the first embodiment, as described above, an example in which the temperature sensor 14 is provided in the vicinity of the blow-by gas inlet 20b will be described. However, the temperature sensor 14 is located upstream from the position of the blow-by gas inlet 20b in the intake direction. It may be arranged at a position offset to the side and / or downstream side to detect the intake air temperature before and / or after the introduction of blow-by gas. In the configuration of the first embodiment, the introduction direction of the blow-by gas introduction port 20b and the arrangement direction of the temperature sensor 14 (the insertion direction into the blow-by gas mixing joint 20: the vertical direction in FIG. 4) are orthogonal to each other. However, this configuration is appropriately changed according to the component arrangement configuration in the diesel engine 1.

  In the diesel engine 1 of the first embodiment, as shown in FIGS. 4 and 5, a heating unit 21 that is a heating unit is provided in the vicinity of the outlet portion of the blow-by gas introduction port 20 b in the blow-by gas mixing joint 20. ing. The heating unit 21 is provided in the circulation path of the engine cooling water, and the cooling water inlet 21a to which the engine cooling water is supplied and the cooling water drain port that is discharged after the blow-by gas mixing joint 20 is heated. 21b. The heating unit 21 is provided in close contact with the outer peripheral surface of the blow-by gas mixing joint 20 and includes the intake air flowing through the intake passage 20a of the blow-by gas mixing joint 20 and the blow-by gas supplied from the blow-by gas introduction port 20b. For example, engine cooling water of about 70 ° C. has a function as a heating means for heating the mixing region by flowing into the heating unit 21. The heating unit 21 is formed of a heat-resistant resin material, and may be formed integrally with the blow-by gas mixing joint 20 formed of a resin material.

  In the cross-sectional view in FIG. 5, for ease of explanation, the blow-by gas inlet 20 b of the blow-by gas mixing joint 20, the cooling water inlet 21 a of the heating unit 21, and the cooling of the heating unit 21 are illustrated. Although the arrangement position of the water drain port 21b is drawn on the same cross section, the actual arrangement of each is appropriately changed according to the component configuration in the diesel engine 1.

  When a device equipped with the diesel engine 1 as an engine device as a power source is used in an extremely cold region (for example, the outside air temperature is −20 ° C.), the intake air temperature (fresh air temperature) is, for example, −20 ° C. . When the blow-by gas in the crankcase that leaks from the combustion chamber is simply mixed with the intake air at such an intake temperature, the moisture contained in the blow-by gas freezes instantaneously, and the mixing region of the intake and blow-by gas There is a big problem that icing occurs in this pipe line and the pipe line is blocked.

  Hereinafter, a case will be considered in which a device using the diesel engine 1 that is the engine device of the first embodiment configured as described above as a power source is used in an extremely cold region. In the configuration of the diesel engine 1 of the first embodiment, for example, when outside air of −20 ° C. is supplied to the intake pipe 13 through the air cleaner, the intake passage 20a of the blow-by gas mixing joint 20 is provided on the outer peripheral surface thereof. The heating unit 21 is warmed to 0 ° C. or higher. That is, the engine cooling water (for example, about 70 ° C.) flowing in the heating unit 21 is near the joint portion between the intake passage 20a and the blowby gas inlet 20b of the blowby gas mixing joint 20, that is, between the intake and blowby gas. The mixing area is warmed. For this reason, even if blow-by gas is introduced into the intake passage 20a from the blow-by gas introduction port 20b, moisture contained in the blow-by gas is prevented from being rapidly cooled by intake air in the intake passage 20a, and the blow-by gas introduction port 20b. Is prevented from icing on the pipe wall in the intake passage 20a in the vicinity of.

  As described above, even when the device using the diesel engine 1 of the first embodiment as a power source is used in an extremely cold region, the heating unit 21 that is a heating unit is in close contact with the outer peripheral surface of the blow-by gas mixing joint 20. Thus, the heat of the engine cooling water is provided to conduct heat to the blow-by gas mixing joint 20. Therefore, in the vicinity of the blow-by gas inlet 20b of the blow-by gas mixing joint 20 and / or the intake passage 20a, moisture contained in the blow-by gas is prevented from instantly freezing and icing on the pipe wall. It becomes the structure which does not obstruct | occlude a pipe line.

  In the configuration of the first embodiment, the heating unit 21 is used for the piping of the piping through which engine cooling water flows. However, in the present disclosure, the cooling water piping for EGR cooler or the piping for oil cooler is used. You may comprise so that cooling water may be poured through the heating part 21 using. Further, the cooling water in the diesel engine 1 that is the engine device may be extracted from the outlet of the cooling water pump. These cooling water extraction methods and the like can also be applied to the configurations of the respective embodiments described below.

(Embodiment 2)
Next, a diesel engine as an engine apparatus according to Embodiment 2 of the present disclosure will be described focusing on differences from Embodiment 1 described above. In the diesel engine of the second embodiment, the difference from the configuration of the first embodiment is the configuration of a heating unit that is a heating means provided in the blow-by gas mixing joint, and other configurations are the same as those of the first embodiment. Is the same. Therefore, in the description of the second embodiment, elements having the same functions, configurations, and functions as those of the first embodiment are denoted by the same reference numerals, and detailed descriptions of the elements having the same reference numerals are omitted. To do.

  FIG. 6 is a cross-sectional view taken along the intake direction of the blow-by gas mixing joint 20A in the diesel engine 1 according to the second embodiment of the present disclosure. As shown in FIG. 6, in the second embodiment, the heating unit 22 serving as a heating means is in close contact with the outer peripheral surface of the intake passage 20a upstream from the blowby gas introduction port 20b of the blowby gas mixing joint 20A. It is provided to conduct heat of the heating unit 22. The heating unit 22 is provided with a cooling water introduction port 22a and a cooling water drain port 22b, and is disposed in the circulation path of the engine cooling water.

  As described above, in the configuration of the second embodiment, the heating unit 22 is provided on the outer peripheral surface of the intake passage 20a upstream of the blow-by gas inlet 20b. For this reason, for example, even when the engine device of the second embodiment is used as a power source in an extremely cold region (for example, the outside air temperature is −20 ° C.), it is upstream from the blow-by gas inlet 20b of the blow-by gas mixing joint 20A. The intake air (fresh air) flowing through the intake passage 20a on the side is warmed to 0 ° C. or higher by engine cooling water (for example, about 70 ° C.) flowing through the heating unit 22. As a result, in the blow-by gas introduced from the blow-by gas inlet 20b of the blow-by gas mixing joint 20A, moisture is prevented from instantly freezing. As a result, in the mixing region where blow-by gas from the blow-by gas inlet 20b is introduced into the intake passage 20a, an accident occurs that causes icing on the pipe wall of the pipe line through which the blow-by gas flows and closes the pipe line Can be prevented.

  In the above-described configuration of the second embodiment, the heating unit 22 has been described as being provided on the outer peripheral surface of the intake passage 20a upstream of the blow-by gas inlet 20b. The portion 22 may be provided in close contact with the outer peripheral surface of the reduction hose connected to the blow-by gas inlet 20b, and the heat of the heating portion 22 may be conducted to the reduction hose.

(Embodiment 3)
Next, a diesel engine as an engine device of Embodiment 3 according to the present disclosure will be described focusing on differences from Embodiment 1 described above. In the diesel engine of the third embodiment, the difference from the configuration of the first embodiment is that a reducing hose that protrudes from the upper surface of the head cover and forms a pipe line from the exhaust port to the blow-by gas inlet of the blow-by gas mixing joint. It is the structure of the heating means provided in the above. Other configurations of the engine device of the third embodiment are the same as those of the first embodiment. Therefore, in the description of the third embodiment, elements having the same functions, configurations, and functions as those of the first embodiment are denoted by the same reference numerals, and detailed descriptions of the elements having the same reference numerals are omitted. To do.

  FIG. 7 is a cross-sectional view illustrating the reduction hose 12 that connects the exhaust port 11 of the head cover 10 to the blow-by gas introduction port 20b of the blow-by gas mixing joint 20B in the diesel engine 1 according to the third embodiment of the present disclosure. As shown in FIG. 7, a cooling water conduit 23 is disposed inside the reduction hose 12. The cooling water pipe 23 is a pipe through which engine cooling water, which is cooling water after engine cooling, flows, and is provided over substantially the entire length of the reduction hose 12. In addition, the cooling water pipe 23 which is a heating means arrange | positioned inside the reduction hose 12 is provided at least to the vicinity of the blow-by gas inlet 20b of the blow-by gas mixing joint 20B.

  Note that the cooling water conduit 23 of the heating means in the configuration of the third embodiment will be described with a configuration connected to a pipe through which engine cooling water, which is cooling water after engine cooling, flows. Similarly to the configuration of the embodiment, a cooling water pipe 23 using an EGR cooler cooling water pipe or an oil cooler pipe may be provided inside the reduction hose 12.

  The cooling water pipe 23 shown in FIG. 7 has been described as an example in which the cooling water pipe 23 is disposed inside the reduction hose 12. However, the cooling water pipe is in close contact with the outer peripheral surface of the reduction hose 12, for example, along the flow of the cooling water. It may be configured in a straight line shape or a winding shape, or may be arranged by winding the outer peripheral surface of the reduction hose in a spiral shape.

  As described above, in the configuration of the third embodiment, the cooling water conduit 23 through which the cooling water passes is provided in the reduction hose 12. Therefore, for example, even when the engine device of Embodiment 3 is used as a power source in an extremely cold region (for example, outside air temperature is −20 ° C.), blow-by gas mixing is performed from the exhaust port 11 of the head cover 10 in the diesel engine 1. The blow-by gas flowing inside the narrow reducing hose 12 up to the blow-by gas inlet 20b of the joint 20B is warmed to 0 ° C. or higher by engine cooling water (for example, about 70 ° C.) flowing through the cooling water conduit 23. . As a result, in the blow-by gas inside the reduction hose 12, moisture does not freeze instantly, and in the reduction hose 12, the blow-by gas introduction port 20b, and the mixing region of the blow-by gas introduction port 20b and the intake passage 20a, respectively. Occurrence of an accident such as icing on the pipe wall of the pipe and closing the pipe is prevented.

  Note that the cooling water conduit 23 as a heating means through which the cooling water flows may be provided upstream of the region where the blow-by gas is introduced in the blow-by gas mixing joint 20B. With this configuration, the intake air upstream of the region where the blow-by gas is introduced is warmed, and the intake air temperature in the region where the intake air flowing into the blow-by gas mixing joint 20B and the blow-by gas introduced from the reduction hose 12 are mixed is set. It becomes possible to raise, and there exists an effect similar to the above-mentioned effect at the time of providing the cooling water pipe line 23 in the reduction hose 12.

(Embodiment 4)
Next, a diesel engine as an engine device of Embodiment 4 according to the present disclosure will be described focusing on differences from Embodiment 1 described above. In the diesel engine of the fourth embodiment, the difference from the configuration of the first embodiment is the configuration of the blow-by gas mixing joint. Other configurations of the engine apparatus of the fourth embodiment are the same as those of the first embodiment. Therefore, in the description of the fourth embodiment, elements having the same functions, configurations, and functions as those of the first embodiment are denoted by the same reference numerals, and detailed descriptions of the elements having the same reference numerals are omitted. To do.

  FIG. 8 is a perspective view showing a blow-by gas mixing joint 20C in the diesel engine 1 according to the fourth embodiment of the present disclosure. FIG. 9 is a cross-sectional view taken along the intake direction of the blowby gas mixing joint 20C shown in FIG.

  The blow-by gas mixing joint 20C in the diesel engine 1 of the fourth embodiment is provided on the pipe line of the intake pipe 13 and leaks from the combustion chamber, as in the configurations of the first to third embodiments. The blow-by gas is introduced into the intake pipe 13. As shown in FIGS. 8 and 9, the blow-by gas mixing joint 20 </ b> C connected to the intake pipe 13 is provided with a blow-by gas introduction pipe 24 to which the reduction hose 12 is connected. The blow-by gas mixing joint 20C is provided with a spacer 25 for fixing the blow-by gas introduction pipe 24 to the blow-by gas mixing joint 20C. Further, a cooling water pipe 26 through which engine cooling water after engine cooling flows is fixed in contact with the blow-by gas introduction pipe 24 and the spacer 25. The blow-by gas introduction pipe 24, the spacer 25, and the cooling water pipe 26 are made of a metal having good heat conductivity, such as copper, aluminum, brass, and the like, and are fixed to each other while maintaining good heat conduction using welding or the like. Has been.

  In the configuration of the fourth embodiment, since the intake passage 20a of the blow-by gas mixing joint 20C is made of a heat-resistant resin material, the spacer 25 is brought into close contact with the pipe wall of the intake passage 20a in a liquid-proof state. It is fixed with bolts. A predetermined contact area is secured between the pipe wall of the intake passage 20a and the spacer 25 so as to conduct heat.

  As described above, in the configuration of the fourth embodiment, the cooling water pipe 26 through which the cooling water from the engine passes is in contact with the blow-by gas introduction pipe 24 to which the reduction hose 12 is connected and the pipe wall of the intake passage 20a. It is provided so as to conduct heat to the spacer 25. For this reason, for example, when the engine device of the fourth embodiment is used as a power source in an extremely cold region (for example, the outside air temperature is −20 ° C.), mixing of the blow-by gas containing moisture and the intake air in the blow-by gas mixing joint 20C The region is warmed to 0 ° C. or higher by engine cooling water (for example, about 70 ° C.) through which the cooling water pipe 26 flows. For this reason, in the mixed region of the blow-by gas and the intake air, the moisture contained in the blow-by gas does not freeze instantly, and the accident occurs in which the pipe line in the mixed region is icing to block the pipeline. Is prevented.

  As described above, in the engine device of the present disclosure, the blow-by gas reduction mechanism that recirculates the blow-by gas in the engine body leaking from the combustion chamber to the intake system is provided, and in the blow-by gas reduction mechanism, the intake air and the blow-by gas are provided. The circulation path of the cooling water is disposed in the pipe line near the mixing region where the water flows and is heated. Thus, by providing the cooling water circulation path in the blow-by gas reduction mechanism, for example, even when the engine device of the present disclosure is used as a power source in a cold region or a very cold region, the blow-by gas in the blow-by gas reduction mechanism The moisture contained in is prevented from icing on the pipe wall, and the pipe is prevented from being blocked by ice.

  It should be noted that, by appropriately combining arbitrary configurations among the configurations described in the above embodiments, the excellent effects of each can be achieved.

  Although the present disclosure has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various variations and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as included within the scope of the present disclosure as set forth in the appended claims.

  The present disclosure is used for an engine device such as a diesel engine mounted as a power source in various power devices such as a work vehicle, an agricultural machine, a generator, and a refrigerator, and particularly in an engine device used in a cold region or a very cold region. Useful.

1 Diesel engine (engine equipment)
DESCRIPTION OF SYMBOLS 10 Head cover 11 Blow-by gas expansion chamber exhaust port 12 Reduction hose 13 Intake pipe 14 Temperature sensor 20, 20A, 20B, 20C Blow-by gas mixing joint 20a Intake passage 20b Blow-by gas introduction port 20c Sensor holding unit 21, 22 Heating unit 21a, 22a Cooling water inlet 21b, 22b Cooling water outlet 23 Cooling water conduit 24 Blow-by gas inlet pipe 25 Spacer 26 Cooling water pipe

Claims (7)

In an engine apparatus having a blow-by gas reduction mechanism for recirculating blow-by gas leaking from a combustion chamber to an intake pipe through which intake air flows,
A reduction hose through which the blow-by gas from the combustion chamber flows;
A blow-by gas mixing joint for introducing the blow-by gas flowing through the reduction hose into the intake pipe;
A heating means for increasing the temperature in the mixing region of the intake air flowing through the blow-by gas mixing joint and the blow-by gas introduced from the reduction hose,
The engine apparatus comprised using the cooling water in the said engine apparatus as a heating source in the said heating means.   The heating means is configured such that the cooling water flows on an outer peripheral surface of the blow-by gas mixing joint in a mixing region of the intake air flowing through the blow-by gas mixing joint and the blow-by gas introduced from the reduction hose. Item 4. The engine device according to Item 1.   2. The engine according to claim 1, wherein the heating unit is configured such that, in the blow-by gas mixing joint, the cooling water flows on an outer peripheral surface upstream of an introduction region of the blow-by gas introduced from the reduction hose. apparatus.   The said heating means is comprised so that the said cooling water may flow into the outer peripheral surface of an upstream side and a downstream side from the introduction area | region of the said blowby gas introduce | transduced from the said reduction | restoration hose in the said blowby gas mixing joint. The engine device described.   The engine device according to claim 1, wherein the heating means is configured by a cooling water pipe arranged so as to heat blow-by gas flowing through the reduction hose with the cooling water.   2. The engine device according to claim 1, wherein the heating means is configured by a cooling water pipe disposed upstream of a region where blow-by gas is introduced in the blow-by gas mixing joint. The heating means is composed of a member having thermal conductivity provided in at least a part of the blow-by gas mixing joint,
The heating means is a blow-by gas introduction pipe to which the reduction hose is connected;
The blow-by gas introduction pipe is fixed so as to conduct heat, and a spacer that is in close contact with the outer peripheral surface of the blow-by gas mixing joint,
The engine apparatus according to claim 1, further comprising: a cooling water pipe disposed in close contact with the blow-by gas introduction pipe so as to conduct heat to the spacer and through which the cooling water flows.

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