JP5703615B2 - Oil deterioration prevention device for internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine, and more particularly to an oil deterioration prevention device for an internal combustion engine suitable for sludge generation and oil deterioration suppression.

  Generally, an internal combustion engine is provided with a lubricating oil supply device, and friction is reduced by lubricating the sliding portions of the rotating members and cooling the moving members themselves. Various deterioration factors are known for the lubricating oil used here. For example, when an acidic substance formed by the reaction between NOx in blow-by gas and condensed water that is likely to be generated in the head cover enters the lubricating oil, the generation of sludge and the deterioration of the lubricating oil are accelerated, thereby Reduce each function.

  In order to cope with such a problem of deterioration of the lubricating oil, Patent Document 1 discloses that the performance of the lubricant additive that can be used in the internal combustion engine is replaced or supplemented in the supply path of the lubricant (oil). An internal combustion engine lubricant system having a calibrated chemical oil filter is disclosed.

  Patent Document 2 discloses a hollow camshaft in which an oil passage is formed by attaching a resin film to a cast hole formed in the axial direction of the cast shaft.

Special table 2008-540123 Japanese Utility Model Publication No. 2-026702

  By the way, the technique described in Patent Document 1 uses a chemical oil filter adjusted to replace or supplement the performance of a lubricant (oil) additive such as a cleaning agent or a dispersant that can be used in an internal combustion engine. The chemical oil filter is formed in a porous structure in which particulate substances are combined. Therefore, while the chemical oil filter is new, it can be expected that the desired effect can be achieved without hindering the filtration or passage of the lubricating oil. Accumulation in the holes increases the driving loss of the oil pump, and the effect of reducing the deterioration of the lubricating oil at an early stage. Patent Document 2 only shows a technique for attaching a resin film in order to form a cast hole formed in the axial direction of the cast shaft as an oil passage, and is not intended to suppress the deterioration of the lubricating oil. .

  Accordingly, an object of the present invention is to provide an oil deterioration prevention device for an internal combustion engine that can solve the above-described problems and can suppress the deterioration of oil over a long period of time without accompanying an oil pump drive loss.

  One aspect of an oil deterioration preventing device for an internal combustion engine according to the present invention that solves the above problems is an internal combustion engine that includes a lubricating oil supply device and uses a hollow portion formed in a rotating member as a passage for lubricating oil. A functional resin having an oil deterioration suppressing function is provided on the inner wall of the hollow portion of the rotating member.

  According to this aspect, the rotating member always rotates during operation of the internal combustion engine (hereinafter also referred to as the engine). A centrifugal force acts on the lubricating oil flowing through the lubricating oil passage of the hollow portion formed in the rotating member, and the lubricating oil that does not contain bubbles is provided with a functional resin having a function of suppressing oil deterioration. It is pressed against the internal wall. As a result, the pressing action of the lubricating oil on the functional resin having the function of suppressing the deterioration of oil promotes the function of suppressing the deterioration of the oil of the functional resin and suppresses the deterioration of the oil for a long time without accompanying the loss of driving of the oil pump. can do.

  In the present specification, the oil deterioration inhibiting function refers to an acidic substance component such as nitrate ion or sulfate ion contained in the lubricating oil, a component generated from the lubricating oil additive, and wear and / or elution of engine components. It means the function of removing the oil deterioration component including the generated component from the lubricating oil and / or stopping or suppressing the oil deterioration action by the oil deterioration component.

  Here, the rotating member provided with the functional resin may be a camshaft or a crankshaft.

  Moreover, it is preferable that the hollow part inner wall of the rotation member provided with the said functional resin has a taper which expands toward the exit from the inlet of a lubricating oil path.

  According to this aspect, when centrifugal force is applied and the lubricating oil is pressed against the inner wall of the hollow portion, the taper of the inner wall of the hollow portion also generates a component force in the axial direction of the rotating member, and the lubricating oil is transferred from the lubricating oil passage inlet to the outlet. Acts to move toward. As a result, in addition to the pressing action of the lubricating oil on the functional resin due to the centrifugal force, the lubricating oil moves uniformly, and the lubricating oil contacts the inner wall of the hollow portion of the rotating member evenly, thereby promoting the oil deterioration suppressing function. . Further, the movement of the lubricating oil suppresses foreign matter from accumulating on the surface of the functional resin.

  Further, the inner wall of the hollow portion has a region where the functional resin is provided and a region where the functional resin is not provided, and the region where the functional resin is not provided is provided with the functional resin. It is preferable that the concave portion is far from the rotation center axis of the rotating member as compared to the region.

  According to this embodiment, the foreign matter contained in the lubricating oil is guided to the concave portion that is farther from the rotation center axis of the rotating member than the region where the functional resin is provided by centrifugal force. Therefore, the accumulation of foreign matter on the surface of the functional resin is suppressed, and the inhibition of the oil deterioration suppressing function of the functional resin having the oil deterioration suppressing function is suppressed.

  According to the present invention, it is possible to suppress deterioration of oil over a long period of time without accompanying a drive loss of the oil pump.

1 is a schematic cross-sectional view schematically showing a first embodiment of an oil deterioration preventing device for an internal combustion engine according to the present invention. It is a typical sectional view showing roughly a 2nd embodiment of an oil degradation prevention device of an internal-combustion engine concerning the present invention. It is (A) typical sectional drawing which shows schematically the 3rd Embodiment of the oil deterioration prevention apparatus of the internal combustion engine which concerns on this invention, and (B) the partially expanded view. It is a typical sectional view showing roughly a 4th embodiment of an oil degradation prevention device of an internal-combustion engine concerning the present invention. (A) Schematic sectional view schematically showing a fifth embodiment of an oil deterioration preventing apparatus for an internal combustion engine according to the present invention, (B) a partially enlarged view thereof, and (C) a modified sectional view of a crank journal portion. It is.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 schematically shows a schematic cross-sectional view of a first embodiment in which an oil deterioration prevention device for an internal combustion engine according to the present invention is applied to a camshaft.

  First, an engine (not shown) in one embodiment of the oil deterioration preventing device includes a cylinder block (not shown), a crankcase provided at the lower part of the cylinder block, a cylinder head provided at the upper part of the cylinder block, A head cover is provided at the top of the cylinder head to cover it from above, and an oil pan is provided at the bottom of the crankcase to cover it from below.

  A valve operating chamber is defined in the cylinder head. Specifically, the valve operating chamber is defined by a cylinder head and a head cover, and includes a space region surrounded by both. In the valve operating chamber, an intake valve and an exhaust valve that open and close the intake port and the exhaust port, respectively, a valve spring that biases the intake valve and the exhaust valve in the closing direction, and an intake valve and an exhaust valve that drive in the opening direction, respectively A valve operating mechanism including an intake camshaft and an exhaust camshaft, which will be described later, is provided. Further, oil is supplied to the valve operating chamber from an oil supply port (not shown) for lubrication of the valve operating mechanism.

  On the other hand, a crankcase is defined by a crankcase and an oil pan, and a crankshaft, which will be described in detail later, is connected to a piston via a connecting rod, which will be described later. Oil is stored in the oil pan.

  Further, an oil return passage is formed in the cylinder block and the cylinder head so as to penetrate the valve block and the crank chamber. A plurality of oil return passages are preferably provided. The oil return passage is a passage for dropping the oil remaining on the cylinder head after the lubrication of the valve mechanism toward the crank chamber region and then toward the oil pan.

In this embodiment, a sludge suppression layer (not shown) for suppressing the generation or adhesion of sludge is formed in the head cover. This sludge suppression layer is formed on the inner surface of the head cover 20 by coating. The sludge suppressant of the sludge suppression layer is preferably made of a solid alkaline substance, and specifically, calcium carbonate (CaCO ₃ ) is used as the alkaline substance. The sludge suppression layer acts to neutralize the aforementioned acidic substance.

  Although not shown, this engine includes a lubricating oil supply device including an oil pump and a strainer. The oil pump sucks lubricating oil in the oil pan through a strainer, and passes through an oil passage (including a plurality of oil passages corresponding to each supply site) formed in the engine through an oil filter. Friction is reduced by supplying the moving member including the rotating member and lubricating the bearing sliding portion of the rotating member and cooling the moving member itself.

  And in the engine of this embodiment, the hollow part formed in the camshaft and the crankshaft as a rotating member is used as a passage for lubricating oil, and the functionality having an oil deterioration suppressing function on the inner wall of those hollow parts Resin is provided. Hereinafter, the details will be described in order with reference to FIGS.

  First, a first embodiment when the rotating member is the camshaft 10 will be described with reference to FIG. As shown in FIG. 1, the camshaft 10 is rotatably supported by a plurality of cam bearings 12 provided in the cylinder head, and has a plurality of cam noses 14 that respectively drive intake valves or exhaust valves in the opening direction. Yes. In the first embodiment, an axial hollow portion 10A is formed at the central portion of the camshaft 10, and extends radially from the hollow portion 10A at positions corresponding to the plurality of cam bearings 12, respectively. An oil hole 10B is formed.

  In the first embodiment shown in FIG. 1, lubricating oil is supplied from an oil hole 12 </ b> A formed in the central cam bearing 12. The supplied lubricating oil is introduced into the hollow portion 10A through the radial oil holes 10B (inlet of the lubricating oil passage) at the corresponding positions, and then the hollow portion 10A is used as a lubricating oil passage. Then, the oil is discharged through a radial oil hole 10B (lubricating oil passage outlet) at a position corresponding to the left and right cam bearings 12. The discharged lubricating oil is used for lubricating the sliding surfaces of the left and right cam bearings 12. Furthermore, a functional resin 60 having an oil deterioration suppressing function is provided on the inner wall of the hollow portion 10A.

  Here, the functional resin 60 having an oil deterioration suppressing function provided on the camshaft 10 which is the above-described rotating member will be briefly described. The functional resin 60 of the present embodiment can include an ion exchange resin. The ion exchange resin has a function of adsorbing predetermined ions (ion components) in the lubricating oil, in other words, a function of removing predetermined ions from the lubricating oil, or instead of adsorbing predetermined ions in the lubricating oil. It has a function of releasing ions. The ion exchange resin used here is an additive such as an antioxidant, a metal detergent, a friction modifier, an ashless dispersant, a pH adjuster, etc. contained in the lubricating oil, or a by-product caused by combustion in the engine. An anionic ion exchange resin and / or a cationic ion exchange resin can be used according to the type. In addition, as an ion exchange resin, it can provide in a hollow part inner wall surface by apply | coating or sticking a liquid or a film-like thing, respectively, These, for example, are ion of Mitsubishi Chemical Corporation Diaion (trademark) series. Exchange resin and ion exchange resin of Amberlite (registered trademark) series manufactured by Rohm and Haas can be used.

  The operation of the oil deterioration preventing apparatus for an internal combustion engine according to the first embodiment having the above-described configuration will be described. That is, during operation of the engine, the camshaft 10 is always rotating, and centrifugal force acts on the lubricating oil flowing in the lubricating oil passage of the hollow portion 10A formed in the camshaft 10. When centrifugal force acts on the lubricating oil, if bubbles are contained in the lubricating oil, the low specific gravity bubble-containing portion is collected in the center of the hollow portion 10A, and the high specific gravity bubble-free portion is collected. The lubricating oil is pressed against the inner wall of the hollow portion 10A provided with the functional resin 60 having an oil deterioration suppressing function. As a result, the oil deterioration suppressing function of the functional resin 60 is promoted by the pressing action of the lubricating oil on the functional resin 60 having the oil deterioration suppressing function. Moreover, compared with the case where the conventional chemical oil filter is used, deterioration of oil can be suppressed over a long period of time without accompanying the drive loss of the oil pump.

  Next, a second embodiment when the rotating member is the camshaft 10 will be described with reference to FIG. This second embodiment has a taper that the inner wall of the hollow portion 10A of the camshaft 10 provided with the functional resin 60 expands from the inlet to the outlet of the lubricating oil passage as compared to the first embodiment described above. Since the only difference is that they are configured to have the same functional parts, the same reference numerals as those in FIG.

  Specifically, in the second embodiment, an axial hollow portion 10A is formed in the central portion of the camshaft 10, and the inner wall has a taper that expands from the inlet to the outlet of the lubricating oil passage. It is comprised so that it may have. Oil holes 10B extending in the radial direction from the hollow portion 10A are formed at positions corresponding to the plurality of cam bearings 12, respectively. In the second embodiment shown in FIG. 2, lubricating oil is supplied from an oil hole 12 </ b> A formed in the leftmost cam bearing 12. The supplied lubricating oil is introduced into the hollow portion 10A through the radial oil holes 10B (inlet of the lubricating oil passage) at the corresponding positions, and then the hollow portion 10A is used as a lubricating oil passage. Then, the oil is discharged through the radial oil holes 10B (first and second lubricating oil passage outlets) at positions corresponding to the two cam bearings 12 on the right side. The discharged lubricating oil is used for lubricating the sliding surfaces of the two right cam bearings 12.

  According to the second embodiment, when the lubricating oil is pressed against the inner wall of the hollow portion 10A due to the centrifugal force, the axial direction of the camshaft 10 (from left to right in FIG. 2) is caused by the taper of the inner wall of the hollow portion 10A. Direction), the lubricating oil is moved from the lubricating oil passage inlet toward the outlet. As a result, in addition to the pressing action of the lubricating oil on the functional resin 60 by centrifugal force, the lubricating oil moves from the left to the right, so that the lubricating oil is functional resin on the inner wall of the hollow portion 10A of the camshaft 10. The oil deterioration control function is promoted by contacting with 60 uniformly. Further, the movement of the lubricating oil suppresses foreign matter from accumulating on the surface of the functional resin 60.

  Next, a third embodiment when the rotating member is the camshaft 10 will be described with reference to FIG. The third embodiment is different from the first embodiment in that the inner wall of the hollow portion has a region where the functional resin 60 is provided and a region where the functional resin 60 is not provided. The region where 60 is not provided is different from the region where the functional resin 60 is provided only in that it is a recessed portion that is far from the rotation center axis of the camshaft 10. The same reference numerals as those in FIG.

  Specifically, in the third embodiment, an axial hollow portion 10A is formed in the central portion of the camshaft 10, and the inner wall has a function and a region in which the functional resin 60 is provided in the circumferential direction. A region where the functional resin 60 is not provided, and the region where the functional resin 60 is not provided is farther from the rotation center axis of the camshaft 10 than the region where the functional resin 60 is provided. An annular recess 16 shown in an enlarged manner in FIG. 3B is formed. In the third embodiment shown in FIG. 3, as in the first embodiment described above, lubricating oil is supplied from the oil hole 12A formed in the central cam bearing 12, and the supplied lubricating oil is in its corresponding position. After being introduced into the hollow portion 10A through the radial oil hole 10B (inlet of the lubricating oil passage), the hollow portion 10A is used as a lubricating oil passage at a position corresponding to the left and right cam bearings 12. The oil is discharged through the radial oil hole 10B (lubricating oil passage outlet). The discharged lubricating oil is used for lubricating the sliding surfaces of the left and right cam bearings 12.

  According to the third embodiment, even when foreign matter is present in the lubricating oil, the foreign matter contained in the lubricating oil is provided with the functional resin 60 with centrifugal force when moving through the lubricating oil passage. Compared to the formed region, the cam shaft 10 is guided to the annular concave portion 16 which is far from the rotation center axis, and is accumulated in the concave portion 16. Therefore, the accumulation of foreign matters on the surface of the functional resin 60 is suppressed, and the oil deterioration suppressing function of the functional resin 60 having the oil deterioration suppressing function is inhibited from being inhibited.

  Next, a fourth embodiment when the rotating member is the crankshaft 30 will be described with reference to FIG. As shown in FIG. 4, the crankshaft 30 includes a crank journal 30A that is rotatably supported by a cylinder block, a crank pin 30B that is rotatably connected to a large end portion of a connecting rod (not shown), a crank journal 30A and a crank journal. A crank throw 30C for connecting the pin 30B and a counterweight 30D are provided.

  In the fourth embodiment shown in FIG. 4, the crankshaft 30 is inclined with respect to the rotation center axis of the crankshaft 30 from the center crank journal 30A to the crankpin 30B through the left and right crank throws 30C. Thus, a hollow portion 30E is formed. The crank journal 30A is formed with an oil hole 30F that communicates with the hollow portion 30E perpendicular to the rotation center axis of the crankshaft 30, and the crank pin 30B communicates with the hollow portion 30E perpendicular to the center axis. An oil hole 30G is formed. Furthermore, the functional resin 60 which has an oil deterioration suppression function is provided in the inner wall of the hollow part 30E.

  In the fourth embodiment shown in FIG. 4, after the lubricating oil is supplied from the oil hole 30F formed in the central crank journal 30A and introduced into the hollow portion 30E, the hollow portion 30E is used as a passage for the lubricating oil. Then, the oil is discharged through the oil hole 30G of the crankpin 30B. The discharged lubricating oil is used for lubricating the large end portion of the connecting rod and the sliding surface of the crank pin 30B. Also in the fourth embodiment, centrifugal force acts on the lubricating oil flowing in the lubricating oil passage of the hollow portion 30E formed in the crankshaft 30 that is always rotating during the operation of the engine. The lubricating oil on which the centrifugal force acts is pressed against the inner wall of the hollow portion 30E provided with the functional resin 60 having an oil deterioration suppressing function, and the functional resin 60 is pressed against the functional resin 60 having the oil deterioration suppressing function. The oil deterioration suppressing function of 60 is promoted.

  On the other hand, in the fifth embodiment shown in FIG. 5, with respect to the crankshaft 30, as in the fourth embodiment, the crankshaft 30 extends from the center crank journal 30A to the crankpin 30B via the left and right crank throws 30C. A hollow portion 30E is formed to be inclined with respect to the rotation center axis, and a hollow portion 30H is formed from the crank journal 30A through the crank throw 30C to the crank pin 30B, respectively intersecting the hollow portion 30E. Yes. The leftmost crank journal 30A has an oil hole 30J communicating with the hollow portion 30H in the direction of the rotation center axis of the crankshaft 30, and the crank pin 30B has hollow portions 30E and 30H perpendicular to the central axis. An oil hole 30G communicating with the crossing portion is formed. In addition, the functional resin 60 which has an oil deterioration suppression function is provided in the inner wall of the hollow parts 30E and 30H. Further, the hollow portions 30E and 30H have extensions extending beyond the intersections, and are configured as recesses 30K and 30L, respectively.

  In the fifth embodiment shown in FIG. 5, after the lubricating oil is supplied to the left end crank journal 30A from the oil hole 30J formed in the direction of the rotation center axis and introduced into the hollow portion 30H, the hollow portions 30H are sequentially formed. The hollow portion 30E is used as a lubricating oil passage and is discharged through the oil hole 30G of the crank pin 30B. The discharged lubricating oil is used for lubricating the large end portion of the connecting rod and the sliding surface of the crank pin 30B. Also in the fifth embodiment, centrifugal force acts on the lubricating oil flowing through the lubricating oil passages of the hollow portion 30H and the hollow portion 30E formed in the crankshaft 30 that is always rotating during the operation of the engine, and the oil The oil deterioration suppressing function of the functional resin 60 is promoted by the pressing action on the functional resin 60 having the deterioration suppressing function. At the same time, when foreign matter is present in the lubricating oil, the foreign matter contained in the lubricating oil is caused by centrifugal force when moving through the lubricating oil passages of the hollow portion 30H and the hollow portion 30E. The extended portions beyond the intersecting portions are respectively guided to the configured concave portions 30K and 30L and accumulated in the concave portions 30K and 30L. Therefore, the accumulation of foreign matters on the surface of the functional resin 60 is suppressed, and the oil deterioration suppressing function of the functional resin 60 having the oil deterioration suppressing function is inhibited from being inhibited.

  Note that a modification of the fifth embodiment described above is shown in FIG. In this modification, like the camshaft 10 in the second embodiment described above, the inner wall of the oil hole 30J formed in the rotation center axis direction in the crank journal 30A at the left end is directed from the inlet to the outlet of the lubricating oil passage. And a taper that expands. According to this modification, when the centrifugal force is applied and the lubricating oil is pressed against the inner wall of the oil hole 30J, the axial direction of the crankshaft 30 (from left to right in FIG. 5) is divided by the taper of the inner wall. Force is also generated and acts to move the lubricating oil from the lubricating oil passage inlet to the outlet. As a result, in addition to the pressing action of the lubricating oil on the functional resin 60 by centrifugal force, the lubricating oil moves from the left to the right, so that the lubricating oil is functional resin on the inner wall of the oil hole 30J of the crankshaft 30. The oil deterioration control function is promoted by contacting with 60 uniformly. Further, the movement of the lubricating oil suppresses foreign matter from accumulating on the surface of the functional resin 60.

  Here, as the ion exchange resin of the functional resin 60, nitrate ions that can be generated by NOx in the engine blowby gas and condensed water due to condensation on the inner surface of the head cover, condensed water as well as SOx in the blowby gas, An anionic ion exchange resin having a function of adsorbing nitrate ions and sulfate ions is used in order to remove sulfate ions that may be generated from the lubricating oil. Such anionic ion exchange resins have a function of adsorbing their anions and releasing, for example, hydroxide ions.

  Here, a cationic ion exchange resin having a function of adsorbing Ca ions is also used in order to remove Ca ions from the lubricating oil. As described above, Ca ions can be generated by consuming an oil deterioration inhibitor containing a Ca component provided in an oil supply system (in the above embodiment, the inner surface of the head cover) in order to suppress sludge generation. In addition, when calcium sulfonate is added as an additive in the lubricating oil, Ca ions can be generated from this calcium sulfonate. Such a cationic ion exchange resin has a function of adsorbing such cations and releasing hydrogen ions and / or Na ions.

In addition, not only the above-mentioned nitrate ion (NO ₃ ⁻ ) and sulfate ion (SO ₄ ²⁻ ) but also, for example, from blow-by gas, is desired to be removed from the oil by using an anionic ion exchange resin. There are acetate ions (CH ₃ COO ⁻ ) that can be generated, as well as formate ions (HCOO ⁻ ), chloride ions (Cl ⁻ ), and chromate ions (CrO ₄ ²⁻ ) that can be generated from blow-by gas. It is preferable to use an anionic ion exchange resin having a function of adsorbing at least one ion selected from a group containing these or a group consisting of these. The ions released from the anionic ion exchange resin may be ions that do not promote deterioration of the lubricating oil, preferably ions that suppress the oil deterioration function.

In addition, not only the above-described Ca ions (Ca ²⁺ ) but also, for example, Al ³⁺ , Fe ²⁺ , Fe ³⁺ , ions that are desired to be removed from the oil by using a cationic ion exchange resin. There are Cr ³⁺ , Pb ²⁺ , Ni ²⁺ , Cu ²⁺ , Mg ²⁺ and Ti ⁺ . These may arise from additives to the lubricating oil, such as ZnDTP, or from wear and / or elution of engine components. In particular, it is desired to remove Cu ions, Al ions, Fe ions, and the like generated in the lubricating oil due to wear of the sliding portion of the engine. It is preferable to use a cationic ion exchange resin having a function of adsorbing at least one of these ions. It should be noted that the ions released from the cationic ion exchange resin are ions that do not promote the deterioration of the oil, and preferably suppress the oil deterioration function.

  As described above, the ion exchange resin of the functional resin 60 may be configured from only one of the anionic ion exchange resin and the cationic ion exchange resin. The functional resin 60 in the present invention is not limited to an ion exchange resin, and an inorganic ion exchanger, a chelate resin and / or a synthetic adsorbent can be used.

  The embodiment of the present invention is not limited to the above-described embodiment, and includes all modifications, applications, and equivalents included in the concept of the present invention defined by the claims. Therefore, the present invention should not be construed as being limited, and can be applied to any other technique belonging to the scope of the idea of the present invention.

10 Camshaft 10A Hollow portion 10B Oil hole 12 Camshaft bearing 12A Oil hole 14 Cam nose 16 Recess 30 Crankshaft 30A Crankshaft journal 30B Crankpin 30C Crank throw 30D Counterweight 30E, 30H Hollow portions 30F, 30G, 30J Oil holes 30K, 30L recess 60 functional resin

Claims (3)

In an internal combustion engine provided with a lubricating oil supply device and utilizing a hollow portion formed in a rotating member as a passage for lubricating oil, an ion as a functional resin having a function of suppressing oil deterioration on the inner wall of the hollow portion of the rotating member Provide replacement resin ,
The inner wall of the hollow portion has a region where the functional resin is provided and a region where the functional resin is not provided, and the region where the functional resin is not provided is in a region where the functional resin is provided. An oil deterioration preventing device for an internal combustion engine, characterized in that the recessed portion is far from the rotation center axis of the rotating member.   2. The oil deterioration preventing apparatus for an internal combustion engine according to claim 1, wherein the rotating member provided with the functional resin is a camshaft or a crankshaft.   3. The oil deterioration prevention of the internal combustion engine according to claim 1, wherein an inner wall of the hollow portion of the rotating member provided with the functional resin has a taper that expands from an inlet to an outlet of the lubricating oil passage. apparatus.

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