JP2008038631A - Flow passage arranging member of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective technology for surely preventing accumulation of a deposit, in a flow passage arranging member arranged in a flow passage for flowing gas of an internal combustion engine. <P>SOLUTION: This intake device 100 is constituted by applying a coating film of a lipophilic component to a surface of a base material of an oil-repellent resin, further applying groove forming processing such as exposing the base material of the oil repellent resin by laser beam machining, or applying a coating film of an oil-repellent component to a surface of a base material of a lipophilic resin, and further applying groove forming processing such as exposing the base material of the lipophilic resin by laser beam machining, in at least one of an outer peripheral end surface 104a of a throttle valve 104 and an opposed surface 102a opposed to the throttle valve 104 among respective parts of a bore part 102. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flow passage arrangement member arranged in a flow passage through which a gas of an internal combustion engine flows.

2. Description of the Related Art Conventionally, in an internal combustion engine, there is an increasing demand for reduction in fuel consumption due to laws and regulations, and various measures for dealing with this are being studied. As one of them, it is effective to reduce the leakage air amount when the slot valve for controlling the intake air amount of the internal combustion engine is fully closed, thereby reducing the fuel consumption during idling of the internal combustion engine.
Therefore, Patent Document 1 below discloses an intake device in which a non-adhesive coating film is formed on at least one of the outer peripheral end surface of the throttle valve and the throttle valve facing surface of the bore inner wall. However, in the air intake device described in Patent Document 1, once a thin oil film is formed on the surface of the non-adhesive coating film, the deposit is deposited starting from the thin oil film, so that the deposit accumulation is reliably suppressed. The problem that it is difficult to occur. Therefore, since it is necessary to design the clearance between the throttle valve and the bore inner wall in advance in consideration of deposit accumulation, the amount of leakage air when the slot valve is fully closed increases accordingly, resulting in the idling of the internal combustion engine. The fuel consumption at the time of rotation will deteriorate. Further, regarding the prevention of deposit accumulation, there is a demand not only for the intake device of the internal combustion engine, but also for various flow path arrangement members arranged in the flow path through which the gas of the internal combustion engine flows.
JP-A-8-14069

  Therefore, the present invention has been made in view of such a point, and is effective in more reliably preventing deposit accumulation in a flow path disposing member disposed in a flow path through which the gas of the internal combustion engine flows. It is an issue to provide a new technology.

  In order to achieve the above object, the invention described in each claim is configured. The invention described in each of these claims relates to a distribution route distribution provided in a distribution route through which a gas such as intake air or exhaust gas flows in an engine mounted on an automobile, a ship, a work machine, or the like, or other internal combustion engine. It can be applied to the configuration of the installation member. The “distribution path arrangement member” in the present specification widely includes various members arranged in the intake path, the exhaust path, the injector portion, and the like of the internal combustion engine. Specifically, the throttle valve and throttle body of the intake device disposed in the intake path, the valve of the EGR device (exhaust gas recirculation device) disposed in the exhaust path, the engine valve, the swirl control valve, the injector injection unit Etc. are mentioned as the distribution channel arrangement member here.

(First invention of the present invention)
A first aspect of the present invention for solving the above-described problems is a flow path disposing member for an internal combustion engine as set forth in claim 1.
The flow path disposing member according to claim 1 is a member disposed in the flow path through which the gas of the internal combustion engine flows, and is constituted by at least a base material, a coating film, and a recess.
The base material of the present invention comprises an oil repellent component and is typically composed of an oil repellent resin material. The coating film of this invention is comprised as a coating film which consists of a lipophilic component which coat | covers the surface of a base material. In the present invention, the coating film may be a single-layer coating film or a multi-layer coating film. For example, when a single layer coating film is applied to the substrate, a two-layer coating film in which the substrate itself is the base material, the inner side is the oil-repellent component coating, and the outer side is the lipophilic component coating is the substrate. When applied to the film, an oil repellent component film applied on the inside is used as the base material. The recessed part of this invention is made into a recessed shape regarding the film thickness direction of a coating film, and is comprised as a site | part which a base material exposes. And the surface of the distribution path arrangement | positioning member is comprised by the lipophilic component of a coating film, and the oil-repellent component of the base material exposed in the recessed part. The recess is typically processed on the surface of the coating film after the coating film is formed on the substrate. As for the shape of the recess, a groove shape, a hole shape, or the like can be appropriately employed. Thereby, the coating film surface is made uneven.

  By the way, in the flow path arrangement member arranged in the flow path through which the gas of the internal combustion engine flows, there is a concern that when an oil film is formed by the oil contained in the gas, deposits are accumulated starting from the oil film. The Therefore, in the present invention, in order to prevent deposit accumulation by preventing the formation of an oil film, the surface of the flow path disposing member is made to have the lipophilic component of the coating film and the oil repellency of the base material exposed in the recess. It is supposed to be composed of components.

  In the present invention, the lipophilic component of the coating film is easily adapted to the oil droplets, and therefore provides a suction force that attracts the oil droplets. On the other hand, the oil repellent component of the base material imparts a repulsive force that causes oil droplets to float from the surface of the flow path arranging member. Therefore, when the oil repellent component and the lipophilic component are dispersed with each other, two forces of a suction force and a repulsive force are always applied to the oil droplets. As a result, the oil droplet is lifted by the repulsive force and attracted downward by the suction force, so that the oil film easily slides on the surface without remaining on the surface of the flow path arranging member. Furthermore, in this invention, since the said surface is made uneven | corrugated by providing a several recessed part in the surface, and this can increase a surface area, it becomes possible to improve oil sliding-off performance more. That is, by increasing the surface area, the oil droplet suction action is more emphasized with respect to the hydrophilic component (the oil drop is more likely to spread out), and the oil droplet repulsion action is more emphasized with respect to the oil repellent component ( This makes it easier to play oil droplets), and this is a factor that improves oil sliding performance. Thus, an oil film can be prevented from being formed on the surface of the flow path arranging member, thereby preventing deposits from being deposited.

In addition, as the oil repellent component of the base material in the present invention, a fluororesin composed of tetrafluoroethylene copolymer (TEFC), polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFEP), or the like can be used. . In addition, as the lipophilic component of the coating film in the present invention, silicone resin (modified organopolysiloxane, etc.), inorganic silicon oxide (SiO ₂ ), methyl group-modified polymer (polypropylene (PP), etc.), metal (Ni, Co) , Mn, etc.) and metal oxides can be used.

(Second invention of the present invention)
A second invention of the present invention that solves the above-mentioned problems is a flow path arranging member for an internal combustion engine as set forth in claim 2.
According to a second aspect of the present invention, the flow path disposing member is a member disposed in the flow path through which the gas of the internal combustion engine flows, and is constituted by at least a base material, a coating film, and a recess.
The base material of the present invention comprises a lipophilic component and is typically composed of a lipophilic resin material. The coating film of this invention is comprised as a coating film which consists of an oil-repellent component which coat | covers the surface of a base material. In the present invention, the coating film may be a single-layer coating film or a multi-layer coating film. For example, when a single-layer coating film is applied to the substrate, the substrate itself is a two-layer coating film in which the substrate itself is a base material, the inside is a lipophilic component coating, and the outside is an oil-repellent component coating. When applied to the film, a film of a lipophilic component applied on the inside is used as a base material. The recessed part of this invention is made into a recessed shape regarding the film thickness direction of a coating film, and is comprised as a site | part which a base material exposes. Then, the surface of the flow path arranging member is constituted by the oil repellent component of the coating film and the lipophilic component of the base material exposed in the recess. The shape of the recess is the same as that of the recess in the flow path disposing member according to claim 1.
In the present invention, in order to prevent deposit accumulation by preventing formation of an oil film, the surface of the flow path arranging member is formed by the oil repellent component of the coating film and the lipophilic component of the base material exposed in the recess. It is going to be composed.

  In the present invention, the lipophilic component of the base material is easily adapted to the oil droplets, and thus provides a suction force that attracts the oil droplets. On the other hand, the oil repellent component of the coating film imparts a repulsive force that causes oil droplets to float from the surface of the flow path arranging member. Therefore, when the oil repellent component and the lipophilic component are dispersed with each other, two forces of a suction force and a repulsive force are always applied to the oil droplets. As a result, the oil droplet is lifted by the repulsive force and attracted downward by the suction force, so that the oil film easily slides on the surface without remaining on the surface of the flow path arranging member. Furthermore, in this invention, since the said surface is made uneven | corrugated by providing a several recessed part in the surface, and this can increase a surface area, it becomes possible to improve oil sliding-off performance more. That is, by increasing the surface area, the oil droplet suction action is more emphasized with respect to the hydrophilic component (the oil drop is more likely to spread out), and the oil droplet repulsion action is more emphasized with respect to the oil repellent component ( This makes it easier to play oil droplets), and this is a factor that improves oil sliding performance. Thus, an oil film can be prevented from being formed on the surface of the flow path arranging member, thereby preventing deposits from being deposited.

As the oil repellent component of the coating film in the present invention, a fluororesin composed of tetrafluoroethylene copolymer (TEFC), polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFEP), or the like can be used. . In addition, as the lipophilic component of the base material in the present invention, silicone resin (modified organopolysiloxane etc.), inorganic silicon oxide (SiO ₂ ), methyl group modified polymer (polypropylene (PP) etc.), metal (Ni, Co) , Mn, etc.) and metal oxides can be used.

(Third invention of the present invention)
A third invention of the present invention for solving the above-mentioned problems is a flow path disposing member for an internal combustion engine as described in claim 3.
In this flow path arranging member according to claim 3, the recess according to claim 1 or 2 is configured as a groove having an arcuate cross section, and the plurality of grooves are arranged in parallel to each other. Yes. According to such a configuration, since the concave portion on the surface is a groove portion having an arc cross section, turbulent flow can be generated by an air flow or the like in the circulation path, which is effective for scattering oil droplets on the surface. . Moreover, in this invention, the direction which cross | intersects the extension direction of a groove part is prescribed | regulated as a sliding direction of the oil droplet adhering to the surface of the said distribution path | route arrangement | positioning member. According to such a configuration, it is possible to control the oil drop so that the oil droplet slides in a certain direction.

(Fourth invention of the present invention)
A fourth invention of the present invention that solves the above-mentioned problems is a flow path arranging member for an internal combustion engine as set forth in claim 4.
In this flow path disposing member according to claim 4, the groove depth is set to 100 to 400 nm and the groove width is set to 100 to 800 nm with respect to the reference set dimension of the groove portion according to claim 3. The groove portion of the shape is effective for controlling the oil drop so that the oil droplet slides in a certain direction. In addition, regarding formation of the groove part of the said shape, the groove processing method as needed can be used, and it is preferable to use laser processing, such as femtosecond laser processing typically. The fine periodic grooves formed by this femtosecond laser processing have a high so-called “plateau rate”, and improve the oil drop sliding performance compared to grooves with the same surface roughness formed by polishing or the like. It is effective.

(Fifth invention of the present invention)
A fifth invention of the present invention for solving the above-mentioned problems is a flow path disposing member for an internal combustion engine as described in claim 5.
According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the flow path disposing member is disposed in an intake path as a flow path for supplying intake gas to the internal combustion engine. Provided with at least a bore portion and a throttle valve. The bore portion of the present invention is configured to communicate with the intake path. The throttle valve of the present invention is configured to be accommodated in the bore portion and open and close the bore portion. In the present invention, in particular, a coating film and a plurality of recesses are provided on the surface of at least one of the outer peripheral end portion of the throttle valve and the facing portion facing the throttle valve among the portions of the bore portion.

  With regard to this configuration, a coating film and a plurality of recesses may be provided on the base material surfaces of both the outer peripheral end portion of the throttle valve and the opposing portion of the bore portion facing the throttle valve, or A coating film and a plurality of recesses may be provided on the surface of any one of the outer peripheral end portion of the throttle valve and the facing portion of the bore portion facing the throttle valve. With respect to the throttle valve, it is sufficient that a coating film and a plurality of concave portions are provided at least on the outer peripheral end portion of the throttle valve, and a coating film and a plurality of concave portions may be provided only on the outer peripheral end portion, or the outer peripheral end portion may be provided. The entire throttle valve including the coating film may be provided with a coating film and a plurality of recesses. Further, with respect to the bore portion, it suffices that at least a coating film and a plurality of recesses are provided at a portion facing the throttle valve, and a coating film and a plurality of recesses may be provided only at the facing portion. A coating film and a plurality of recesses may be provided on the entire bore portion including the entire valve housing.

  According to such a configuration, it is not necessary to widen the clearance between the throttle valve and the opposite surface in anticipation of deposit accumulation, and this clearance can be suppressed, so the amount of air leaked when the throttle valve is fully closed This makes it possible to reduce fuel consumption during idling of the internal combustion engine.

  As described above, according to the present invention, it is possible to more reliably prevent deposits from being deposited in the flow path arrangement member of the internal combustion engine disposed in the flow path through which the gas of the internal combustion engine flows. It was.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration of an intake device 100 which is an embodiment of a “flow passage arrangement member of an internal combustion engine” in the present invention. The “internal combustion engine” here includes various internal combustion engines including a gasoline engine and a diesel engine.

An intake device 100 shown in FIG. 1 is arranged in an intake path (distribution path) for supplying intake gas to an internal combustion engine, and is configured as an apparatus for introducing intake air into the internal combustion engine. The intake device 100 constitutes a “distribution path arrangement member” in the present invention.
The intake device 100 includes a metal throttle body (also referred to as a “valve housing”) 101 having a bore portion 102 communicating with an intake path, and a throttle valve 104 supported by the throttle body 101 via a valve shaft 105. Prepare. The throttle valve 104 is also referred to as “butterfly valve” or “valve element”. Although not particularly shown, the valve shaft 105 is further connected to an actuator via a lever and a rod, and the valve opening degree of the throttle valve 104 is controlled by this actuator to control the intake air amount of the internal combustion engine. It is configured as follows. As this actuator, an electric actuator, a negative pressure actuator, or the like is used. The bore portion 102 here corresponds to the “bore portion” in the present invention, and the throttle valve 104 corresponds to the “throttle valve” in the present invention.

  The throttle body 101 is appropriately configured by a metal material such as iron, iron alloy (carbon steel, special steel, heat-resistant steel, stainless steel, etc.), copper, copper alloy, nickel, nickel alloy, cobalt, and cobalt alloy. The throttle valve 104 is mainly composed of a ferritic or austenitic stainless material.

By the way, in an internal combustion engine, the request | requirement with respect to a fuel consumption reduction is increasing by the legal regulations etc., and various measures to cope with this are examined. In the present embodiment, in order to meet this demand, the amount of leaked air when the throttle valve 104 that controls the intake air amount of the internal combustion engine is fully closed is reduced, thereby reducing the fuel consumption during idling of the internal combustion engine. It is said. Specifically, as a measure for reducing the amount of air leakage when the throttle valve 104 is fully closed, both the outer peripheral end surface 104a of the throttle valve 104 and the opposing surface 102a facing the throttle valve 104 among the respective portions of the bore portion 102 are used. The coating film 110 with high oil slidability is provided at the part.
The outer peripheral end surface 104a of the throttle valve 104 here corresponds to the “outer peripheral end portion of the throttle valve” in the present invention, and the opposing surface 102a of the bore portion 102 corresponds to the “opposing portion” in the present invention.

  Unlike the conventional non-stick coating, the coating film 110 is configured as a coating film having a function of sliding off oil without leaving an oil film on the surface of the coating film. For the specific configuration of the coating film 110, reference is made to FIG. FIG. 2 schematically shows the state of the coating film 110 on the base material 103 on the outer peripheral end face 104a of the throttle valve 104 of the present embodiment. This configuration is the same for the coating film 110 formed on the substrate on the facing surface 102a of the bore 102.

  As shown in FIG. 2, the coating film 110 of the present embodiment is based on a tetrafluoroethylene copolymer that is an oil repellent component (including an oil repellent group), and is a lipophilic component for this oil repellent component ( Silicone resin (including lipophilic component) is dispersed. On the contrary, based on a silicone resin that is a lipophilic component, a tetrafluoroethylene copolymer that is an oil repellent component may be dispersed in the lipophilic component. Moreover, you may mix an oil repellent component and a lipophilic component previously. By each of these methods, the coating film 110 is formed into a coating in which the oil repellent component and the lipophilic component are dispersed and combined. Such a coating is also referred to as a so-called “hybrid coating” having both a function of an oil repellent component and a function of a lipophilic component. This coating film 110 corresponds to the “coating film” in the present invention.

  For the performance of the coating film 110, reference is made to FIG. FIG. 3 shows the mechanism of the coating film 110 of the present embodiment.

  In FIG. 3, the lipophilic component in each part of the coating film 110 is easily adapted to the oil droplets, and thus provides a suction force that attracts the oil droplets. On the other hand, the oil repellent component in each part of the coating film 110 imparts a repulsive force that causes oil droplets to float from the film surface. Therefore, the coating film 110 in which the oil repellent component and the lipophilic component are dispersed and combined with each other always applies two forces of the suction force and the repulsive force to the oil droplets. As a result, when gravity or an external force acts on the oil droplet when the inclination angle of the substrate (angle θ in FIG. 3) exceeds the sliding angle, the oil droplet is lifted by the repulsive force and moved downward by the suction force. Since the oil film is attracted, the oil film easily slides down on the coating film 110 without remaining on the surface of the coating film 110. On the other hand, in the conventional coating film composed of only one of the lipophilic component and the oil repellent component, only one of the suction force and the repulsive force is applied to the oil droplet, and the force Since the force overcoming this does not act on the oil droplets, there is a limit in obtaining the desired sliding performance.

As the oil repellent component of the coating film in the present invention, a fluororesin composed of tetrafluoroethylene copolymer (TEFC), polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFEP), or the like can be used. . In addition, as the lipophilic component of the coating film in the present invention, silicone resin (modified organopolysiloxane, etc.), inorganic silicon oxide (SiO ₂ ), methyl group-modified polymer (polypropylene (PP), etc.), metal (Ni, Co) , Mn, etc.) and metal oxides can be used.

  As described above, by employing the coating film 110 of the present embodiment, even when deposit-derived components such as fuel and oil contained in the intake air flow into the vicinity of the throttle valve 104, the coating film 110 is applied. The deposit-derived component that comes into contact easily slides down due to the airflow and gravity generated in the bore portion 102, and the oil film is prevented from remaining. As a result, it is possible to reliably prevent deposits from being deposited in the vicinity of the throttle valve 104, starting from the formation of an oil film, and to suppress the sticking of the throttle valve 104 and the occurrence of flow rate fluctuations. Thus, the clearance between the throttle valve 104 and the inner wall of the bore portion 102 can be suppressed, and the amount of leakage air when the slot valve is fully closed can be reduced, resulting in idle rotation of the internal combustion engine. It becomes possible to improve the fuel efficiency at the time.

  Here, the present inventor carried out a measurement related to the sliding angle of the oil droplet in order to quantitatively evaluate the effect when the coating film 110 of the present embodiment is used. In this measurement, as a comparative example for the coating film 110, a coating film A made of a tetrafluoroethylene copolymer as an oil repellent component and a coating film B made of a silicone resin as a lipophilic component were used. Then, after dropping oil droplets on the flat plate on which each coating film is formed, the flat plate is gradually tilted, and an inclination angle (angle θ in FIG. 3) when the oil droplet moves (slides) on each coating film. ) Was measured as the sliding angle. As a result of this measurement, the sliding angle in the case of the coating film A is 70 ° or more, and the sliding angle in the case of the coating film B is 30 to 50 °. In either case, oil drops remain on the coating film surface. In contrast, the sliding angle in the case of the coating film 110 was 15 ° or less, and no oil film remained on the surface of the coating film. From this result, it was confirmed that by using the coating film 110 of the present embodiment, the oil slidability can be greatly improved and the oil film can be reliably prevented from remaining on the surface of the coating film.

  In addition, the coating film 110 of the present embodiment has an effect of preventing the throttle valve 104 and the base material 103 (also referred to as “base” or “base”) of the throttle body 101 from being exposed to the bore portion 102. The occurrence of corrosion due to water can be suppressed, thereby preventing the malfunction of the throttle valve 104. In particular, in the present embodiment, a tetrafluoroethylene copolymer that is an oil repellent component (including an oil repellent group) is a base, and a silicone resin that is a lipophilic component (including a lipophilic component) is used as the oil repellent component. Since it is dispersed, it is excellent in acid resistance and alkali resistance, and can be a coating film that can withstand condensed water.

  The intake device 100 according to the present embodiment further employs a configuration in which surface processing is performed so that the surface of the coating film is uneven as a measure for improving the oil slidability. Regarding this surface processing, reference is made to FIGS. Here, FIG. 4 shows a sectional structure of the surface processing of the first embodiment, FIG. 5 shows a sectional structure of the surface processing of the second embodiment, and FIG. 6 shows a surface processing of the third embodiment. FIG. 7 shows a cross-sectional structure of the surface processing of the fourth embodiment.

  In the first embodiment shown in FIG. 4, after a plurality of grooves 103a are surface-processed on the base material 103, a coating film 110 having a substantially constant film thickness is further formed on the surface of the base material 103 that has been subjected to the surface processing. It is a membrane. The thickness of the coating film 110 can be set to 1 [μm] or less, for example. Thereby, the surface of the coating film 110 has an uneven shape in which a plurality of groove portions 110a having the same shape as the groove portions 103a of the base material 103 are formed, and the groove portions 103a are arranged in parallel to each other, and the groove portions 110a are It is set as the structure arrange | positioned mutually parallel. The groove portion 103a of the base material 103 is typically configured as a fine periodic groove having a circular arc shape (hemispherical cross section) formed by laser processing such as femtosecond laser processing, that is, an aggregate of uniformly formed grooves. Is preferred. The femtosecond laser processing here is a well-known technique, so a detailed explanation is omitted, but it exceeds the ultrashort pulse and ultrahigh intensity femtosecond laser whose laser pulse width is several to several hundred femtoseconds. It is a processing method in which a periodic structure is formed on the material surface in a self-organized manner by condensing and irradiating the material surface while scanning.

  According to such a configuration, by providing a plurality of grooves 110a on the surface of the coating film 110, the surface can be made uneven, thereby increasing the surface area. It is possible to further improve the oil sliding performance by the film 110. That is, as the surface area of the coating film 110 increases, the oil droplet suction action is more emphasized with respect to the hydrophilic component (the oil droplets are more likely to spread out), and the oil repellent action is more emphasized with respect to the oil repellent component. (It becomes easier to play the oil droplets), and this is a factor to improve the oil sliding performance.

  The shape of the groove 110a is circular in cross section as shown in FIG. 4, and the reference set dimensions are groove depth of 100 to 400 [nm], groove width (the distance in the horizontal direction in FIG. 4). ) Is preferably 100 to 800 [nm], and the surface roughness is preferably about 0.7 [μm]. Thereby, the turbulent flow can be generated in the groove 110a by the air flow generated in the region where the flow velocity around the throttle valve 104 is high, which is effective for scattering oil droplets and dirt. When the groove 110a having the shape is formed by laser processing, the relationship between the laser wavelength to be irradiated and the groove depth and groove width of the groove 110a is typically determined by the groove depth of the groove 110a. 1/10 to 1/2 (1/2 to 1/2) of the laser wavelength to be performed, and the groove width of the groove 110a is equal to or less than the laser wavelength to be irradiated.

  Further, the second embodiment shown in FIG. 5 is an example in which the surface of the coating film 110 itself is processed. In the second embodiment, after a coating film 110 having a substantially constant film thickness is formed on the surface of the smooth substrate 103, a plurality of grooves 110a are processed on the surface of the coating film 110 by femtosecond laser processing. Yes. As a result, the surface of the coating film 110 has an uneven shape in which a plurality of groove portions 110a are formed, and the groove portions 110a are arranged in parallel to each other. The configuration of the groove 110a is substantially the same as the groove 110a of the first embodiment. Therefore, also by this 2nd Embodiment, the effect which improves oil sliding-off performance similarly to 1st Embodiment is acquired.

  Further, unlike the first and second embodiments, the third embodiment shown in FIG. 6 and the fourth embodiment shown in FIG. 7 are examples in which a different type of coating film from the coating film 110 is used. is there. The coating film of the third embodiment or the fourth embodiment can be applied to at least one of the outer peripheral end surface 104a of the throttle valve 104 and the opposing surface 102a that faces the throttle valve 104 in each part of the bore portion 102. .

  In the third embodiment, after the coating film 120 or resin having a lipophilic component is formed on the surface of the base material 123 that is an oil repellent resin, the surface of the base material 123 that is an oil repellent resin is partially exposed. Thus, the groove forming process is performed by femtosecond laser processing. The surface after the groove forming process has a concave and convex shape in which a plurality of groove portions 120a, which are fine periodic grooves having a circular arc cross section (a semispherical cross section), are formed in parallel with each other. The surface is constituted by the lipophilic component of the coating film 120.

  In the fourth embodiment, after the coating film 130 or resin having an oil repellent component is formed on the surface of the base material 133 that is a lipophilic resin, the surface of the base material 133 that is a lipophilic resin is partially exposed. Thus, the groove forming process is performed by femtosecond laser processing. The surface after the groove forming process has a concave and convex shape in which a plurality of groove portions 130a which are fine periodic grooves having a circular arc cross section (a semispherical cross section) are formed in parallel with each other. The surface is constituted by the oil repellent component of the coating film 130.

In addition, regarding the groove part 120a and the groove part 130a, the groove depth is 100 to 400 [nm] and the groove width (the distance in the left-right direction in FIG. 4) is 100 to 800 [nm], similar to the groove parts 103a and 110a described above. The surface roughness is preferably about 0.7 [μm]. Further, as the oil repellent component of the coating film or substrate, a fluororesin composed of tetrafluoroethylene copolymer (TEFC), polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFEP), or the like can be used. . In addition, as a lipophilic component of the coating film or substrate, silicone resin (modified organopolysiloxane etc.), inorganic silicon oxide (SiO ₂ ), methyl group modified polymer (polypropylene (PP) etc.), metal (Ni, Co) , Mn, etc.) and metal oxides can be used.

  The coating films 120 and 130 in the third embodiment and the fourth embodiment correspond to the “coating film covering the surface of the substrate” in the present invention. In particular, the coating film 120 is a coating film made of a lipophilic component, and this coating film 120 corresponds to the “coating film made of a lipophilic component” in the present invention. The coating film 130 is a coating film made of an oil repellent component, and this coating film 130 corresponds to the “coating film made of an oil repellent component” in the present invention. Further, the base materials 123 and 133 referred to here correspond to the “base material” in the present invention. Further, each of the groove portions 120a and 130a is an arcuate section having a concave shape with respect to the film thickness direction of the coating films 120 and 130, and these groove portions 120a and 130a are “recess portions” and “groove portions” in the present invention. It corresponds to.

  In the third embodiment, the coating film 120 of the lipophilic component is formed on the base 123 of the oil repellent component, and in the fourth embodiment, the oil repellent component is applied to the base 133 of the lipophilic component. Although the coating film 130 is formed, in the present invention, the coating film may be a single-layer coating film or a multi-layer coating film. Accordingly, in relation to the third embodiment, a two-layer coating film having an oil repellent component coating on the inside and a lipophilic component coating on the outside is applied to the substrate 123, and the inner oil repellency is formed by the groove 120a. You may comprise so that the film of a component may be exposed. In this case, the inner oil-repellent component film corresponds to the “substrate” in the present invention, and the outer lipophilic component film corresponds to the “coating film” in the present invention. Similarly, in relation to the fourth embodiment, a two-layer coating film having a coating of an oleophilic component on the inside and a coating of an oleophobic component on the outside is applied to the base material 133, and the inner portion of the parent coating is formed by the groove 130a. You may comprise so that the film of an oil component may be exposed. In this case, the inner lipophilic component film corresponds to the “substrate” in the present invention, and the outer oil repellent component film corresponds to the “coating film” in the present invention.

  According to the third embodiment and the fourth embodiment, the surface area of the groove 120a and the groove 130a can be increased to increase the surface area, and the oil sliding performance can be further improved as in the first embodiment. Become. In particular, according to the third embodiment and the fourth embodiment, since a single performance coating film having one of the functions of oil repellency and oleophilicity can be used, the cost of the coating agent can be suppressed. It becomes possible.

  Further, according to the third embodiment and the fourth embodiment, since the oil repellent component and the lipophilic component are alternately arranged on the surface, the oil droplets slide in a certain direction with respect to the oil slipping property. It becomes possible to control to. In this regard, reference is made to FIG. 8 taking the third embodiment as an example. FIG. 8 shows a plan view of the surface processing of the third embodiment.

  As shown in FIG. 8, by performing the surface processing of the third embodiment, an oil repellent component by the base material 123 and a lipophilic component by the coating film 120 are alternately arranged on the surface. With such a configuration, the oil drop sliding direction can be controlled in a predetermined direction that intersects the extending direction of the groove 120a. Also, the groove 120a, which is a fine periodic groove formed by femtosecond laser processing, has a high so-called “plateau rate”, and the oil droplet sliding property compared to a groove having the same surface roughness formed by polishing or the like. It is effective to improve. Such an effect can be obtained in the same manner even when the surface processing of the fourth embodiment is performed.

(Other embodiments)
In addition, this invention is not limited only to said embodiment, A various application and deformation | transformation can be considered. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the above embodiment, the groove portions 110a, 120a, and 130a are described as having a circular arc shape. However, the cross-sectional shapes of the groove portions may be various as required, such as an arc shape, an elliptical shape, a square shape, a triangular shape, and a polygonal shape. It can be set. Moreover, you may comprise the uneven | corrugated shape of the coating film surface by a hole shape instead of a groove shape.

  In the above-described embodiment, the intake device 100 disposed in the intake path of the internal combustion engine has been described. However, various flow path arrangement members and exhaust paths disposed in the flow path through which the gas of the internal combustion engine flows. The present invention can be applied to a valve, an engine valve, a swirl control valve, an injector injection portion, and the like of an EGR device (exhaust gas recirculation device) disposed in the engine.

  Further, the present invention can be applied to various internal combustion engines including a gasoline engine and a diesel engine.

1 is a diagram showing a configuration of an intake device 100 that is an embodiment of an “intake device of an internal combustion engine” in the present invention. FIG. It is a figure which shows typically the mode of the coating film 110 on the base material 103 in the outer peripheral end surface 104a of the throttle valve 104 of this Embodiment. It is a figure which shows the mechanism of the coating film 110 of this Embodiment. It is a figure which shows the cross-sectional structure of the surface processing of 1st Embodiment. It is a figure which shows the cross-section of the surface processing of 2nd Embodiment. It is a figure which shows the cross-sectional structure of the surface processing of 3rd Embodiment. It is a figure which shows the cross-section of the surface processing of 4th Embodiment. It is a top view of surface processing of a 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Air intake device 101 ... Throttle body 102 ... Bore part 102a ... Opposite surface 103 ... Base material 103a ... Groove part 104 ... Throttle valve 104a ... Outer peripheral end surface 105 ... Valve shaft 110,120,130 ... Coating film 110a, 120a, 130a ... Groove part

Claims (5)

A distribution path arrangement member for an internal combustion engine, arranged in a distribution path through which gas of the internal combustion engine circulates,
A base material composed of an oil repellent component;
A coating film comprising a lipophilic component that covers the surface of the substrate;
A plurality of recesses that are recessed in the film thickness direction of the coating film and in which the substrate is exposed;
With
The flow path arrangement of the internal combustion engine, wherein the surface of the flow path arrangement member is composed of a lipophilic component of the coating film and an oil repellent component of the base material exposed in the recess. Element. A distribution path arrangement member for an internal combustion engine, arranged in a distribution path through which gas of the internal combustion engine circulates,
A base material comprising a lipophilic component;
A coating film made of an oil repellent component covering the surface of the substrate;
A plurality of recesses that are recessed in the film thickness direction of the coating film and in which the substrate is exposed;
With
The flow path arrangement of the internal combustion engine, wherein the surface of the flow path arrangement member is constituted by an oil repellent component of the coating film and a lipophilic component of the base material exposed in the recess. Element. A flow path arrangement member for an internal combustion engine according to claim 1 or 2,
The concave portion is configured as a groove portion having an arcuate cross section, and the plurality of groove portions are arranged in parallel to each other, and the direction intersecting the extending direction of the groove portion is thereby the distribution path arranging member. A flow passage arrangement member for an internal combustion engine, characterized in that the arrangement is defined as a sliding direction of oil drops adhering to the surface of the internal combustion engine. A flow path arrangement member for an internal combustion engine according to claim 3,
An internal combustion engine flow path arrangement member characterized in that the groove depth is 100 to 400 nm and the groove width is 100 to 800 nm with respect to a reference set dimension of the groove. It is a distribution channel arrangement member of an internal-combustion engine given in any 1 paragraph of Claims 1-4,
Disposed in an intake path as the flow path for supplying intake gas to the internal combustion engine;
A bore portion communicating with the intake path, and a throttle valve housed in the bore portion to open and close the bore portion;
The coating film and a plurality of recesses are provided on at least one base material surface of an outer peripheral end portion of the throttle valve and a facing portion facing the throttle valve among the portions of the bore portion. A flow passage arrangement member for an internal combustion engine.

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