JP2012072725A - Structure for internal combustion engine, internal combustion engine with position detection mechanism and internal combustion engine with liquid state detection mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for an internal combustion engine for directly confirming a state of a hollow part from the base body outside.SOLUTION: This structure for the internal combustion engine includes: a base body having the hollow part and storing a moving body for moving in the hollow part in response to an explosion caused in the hollow part; and a window member arranged in the base body and transmitting the light incident on the hollow part from the outside of the base body and the light emitted to the hollow part from the outside of the base body. The window member is formed of a sapphire monocrystal.

Description

  The present invention relates to an internal combustion engine structure, an internal combustion engine with a position detection mechanism, and an internal combustion engine with a liquid state detection mechanism.

  So-called reciprocating engines and internal combustion engines called so-called rotary engines have been widely used. For example, in a reciprocating engine, a piston that reciprocates in response to an explosion of a hollow portion is enclosed in a base having a hollow portion. Also, in a rotary engine, a rotor (rotor) that rotates in response to an explosion in the hollow portion is enclosed in a base body having a hollow portion, and the movement of these pistons and rotors is usually smooth in the hollow portion. Lubricating oil is also enclosed.

  As the internal combustion engine is used, metal powder is mixed into the lubricating oil, or the composition of the lubricating oil changes to increase the viscosity. These changes (deterioration) of the lubricating oil lead to a decrease in output characteristics of the internal combustion engine. In order to maintain the output characteristics of the internal combustion engine, it is desirable to monitor the state of the lubricating oil in the hollow portion and replace the lubricating oil in the hollow portion at an appropriate timing according to the state change. However, the state of the lubricating oil sealed in the hollow part and the movement of the piston and rotor that move in the hollow part cannot be directly recognized from the outside of the base. Conventionally, devices and methods for monitoring changes in the lubricating oil and movements of pistons and rotors have been proposed. For example, Patent Document 1 below discloses an example of a lubricating oil contamination measuring apparatus that is immersed in lubricating oil collected in an oil pan of an automobile engine. In the lubricating oil contamination measuring apparatus described in Patent Document 1 below, an optical sensor including a light emitting element and a light receiving element is immersed in the lubricating oil accumulated inside the substrate.

Japanese Patent Publication No. 4-22458

  Since the lubricating oil collected in the hollow part of the substrate becomes high temperature due to explosion in the hollow part, there is a problem that the operation of the sensor becomes unstable. The configuration in which the sensor is arranged on the hollow part of the internal combustion engine that becomes high temperature and high pressure due to the explosion of the hollow part or the base body itself has a problem that the operational reliability of the sensor itself cannot be secured.

  The present invention has been made in view of the above problems, and can detect the position of the structure of the internal combustion engine, the piston and the rotor with high accuracy, which can directly confirm the state of the hollow portion from the outside of the base. Provided are an internal combustion engine with a position detection mechanism, and an internal combustion engine with a liquid state detection mechanism that can detect the state of liquid stored in a hollow portion of the internal combustion engine with high accuracy.

  In order to solve the above-described problems, the present invention provides a base that includes a hollow part and that accommodates a moving body that moves in the hollow part in response to an explosion generated in the hollow part, and the base provided in the base An internal combustion engine comprising: a window member that transmits light incident on the hollow portion from the outside of the substrate and light emitted from the outside of the base body to the hollow portion, wherein the window member is made of a sapphire single crystal. A structure is provided.

  Further, based on the above-described structure for an internal combustion engine, a light detection unit that detects light that passes through the window member and is emitted from the hollow part to the outside of the base body, and the detection information by the light detection unit, the hollow And an internal combustion engine with a position detection mechanism, comprising: a piston position detection unit that detects a position of the moving body in the unit. Further, based on the above-described structure for an internal combustion engine, a light detection unit that detects light that passes through the window member and is emitted from the hollow part to the outside of the base body, and the detection information by the light detection unit, the hollow And an internal combustion engine with a liquid state detection mechanism, comprising: a detection unit that detects a state of the lubricating oil sealed in the unit.

  The structure for an internal combustion engine of the present invention can optically confirm the state of the hollow portion of the base body directly from the outside while maintaining the strength of the base body relatively high. The internal combustion engine with a position detection mechanism of the present invention can detect the position of a moving body that moves in the hollow portion of the base body with high accuracy. The liquid state detection mechanism of the present invention can detect a state such as the degree of contamination of the liquid stored in the hollow portion of the substrate with high accuracy.

It is a schematic sectional drawing explaining the engine comprised by providing one Embodiment of the structure for internal combustion engines of this invention. It is a schematic sectional drawing which expands and shows a part of structure for internal combustion engines of this invention. It is a schematic sectional drawing which expands and shows a part of FIG. (A)-(d) is a schematic sectional drawing explaining other embodiment of the structure for internal combustion engines of this invention. It is a schematic block diagram explaining one embodiment of an internal combustion engine with a position detection mechanism of the present invention and one embodiment of an internal combustion engine with a liquid state detection mechanism of the present invention.

  The present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view illustrating an engine 1 that includes an engine member 10 that is an embodiment of a structure for an internal combustion engine of the present invention.

  The engine member 10 includes a base body 12 having a hollow portion 12 </ b> A and a window member 14 provided in the base body 12. The window member 14 is made of a plate-like sapphire single crystal. In the engine member 10, a plurality of window members 14 (window members 14 a to 14 d) are disposed on the base 12. The base 12 is made of cast iron, aluminum alloy, or the like.

  The engine 1 is a so-called reciprocating engine, and includes an engine member 10, a piston 22 that is a moving body that moves in the hollow portion 12 </ b> A in response to an explosion occurring in the hollow portion 12 </ b> A of the base 12, a connecting rod 24, a crank disk 26, An intake valve 32, an exhaust valve 34, and a spark plug 36 are provided. The intake valve 32 is disposed in an intake port 32 a provided in the base 12, and the exhaust valve 34 is disposed in an exhaust port 34 a provided in the base 12. The base 12 has a cylinder part 42 in which the piston 22 reciprocates and a crank part 44 in which the crank disk 26 is arranged. Two window members 14 (window members 14a and 14b) are provided on the cylinder portion 42 of the base 12 and two window members 14c and 14d are provided on the crank portion 44, respectively. Oil 60 that is a known engine oil is stored in a portion (crank hollow portion 44A) corresponding to the crank portion 44 in the hollow portion 12A.

In the portion of the hollow portion 12A corresponding to the cylinder portion 42 (cylinder hollow portion 42A), the fuel gas that has flowed in through the intake port 32a explodes due to discharge by the spark plug 36. Due to the pressure of the explosion, the piston 22 is pushed downward in the figure, and the energy of the explosion is converted into rotational motion via the connecting rod 24 and the crank disk 26. When the piston 22 descends to the lowest point (bottom dead center), the piston 22 moves up the cylinder hollow portion 42A due to the inertia of the crank disk 26. At this time, the exhaust valve 34 is opened, and the gas in the cylinder hollow portion 42A is discharged through the exhaust port 34a. When the piston 22 rises to the uppermost point (top dead center), the piston 22 moves down the cylinder hollow portion 42A due to the inertia of the crank disk 26. At this time, the intake valve 32 is opened, the fuel gas flows into the cylinder hollow portion 42A via the intake port 32a, and the fuel gas that flows in is compressed in the cylinder hollow portion 42A due to the rise of the piston 22. The compressed fuel gas explodes by the discharge of the spark plug 36, and the piston 22 is pushed downward by the energy of the explosion. In the engine 1, the above operation is repeated.

  Explosion occurs in the hollow portion 12 of the base 12, particularly the cylinder hollow portion 42 </ b> A, and the base 12 is heated to a high temperature and receives a high pressure. In the engine member 10, the window member 14 is provided on the base 12. However, the window member 14 is made of sapphire single crystal, and is not easily cracked or deformed even when subjected to high heat and high pressure. In addition, since light in a wide wavelength range is satisfactorily transmitted, light is incident on the hollow portion 12A of the base 12 from the outside with high transmittance, and light is emitted from the hollow portion 12A to the outside of the base 12 with high transmittance. Can be made. For this reason, in the engine member 10, for example, the movement of the piston 22 that moves the cylinder portion 42, the connecting rod 24 that moves in the crank portion 44, the crank disk 26, and the like can be visually recognized via the window member 14. Further, the engine oil 60 stored in the crank portion 44 can also be visually recognized through the window member 14. Further, as will be described later, by detecting the light emitted from the window member 14 with high accuracy using a sensor provided with a light receiving element, the state inside the hollow portion 12A, for example, the position of the piston 22 and the crank disk 26, The degree of contamination of the engine oil 60 can also be detected.

FIG. 2 is a schematic sectional view showing a part of the engine member 10 in an enlarged manner. FIG. 3 is a sectional view further enlarging the vicinity of the window member 14a in FIG. The window member 14a is the base 1
2 is brazed to the inner peripheral surface of the through-hole provided in 2. 2 and 3, 52 is a brazing material, 53 is a metallized layer, and 54 is a convex portion. 2 and 3, the window member 14a is shown as a representative of the plurality of window members, but the window members 14b to 14d have the same configuration.

  In the engine member 10, a substantially disk-shaped window member 14 is joined to an inner peripheral surface of a through hole provided in the base 12 via a brazing material 52. The window member 14 has a metallized layer 53 attached to the side surface and the peripheral portion of the one main surface 14A. In the engine member 10, the one main surface 14 </ b> A to which the metallized layer 53 is attached is a surface facing the outside of the base body 14. Protrusions 54 are provided on the inner peripheral surface of the through hole of the base 12 continuously in the entire circumferential direction of the through hole. The window member 14 is joined to the inner peripheral surface of the through hole and the side surface of the convex portion 54 via the metallized layer 53 and the brazing material 52. On the inner peripheral surface of the through hole of the base 12 and the side surface of the convex portion 54 (the side surface facing the one main surface 14A of the window member 14), for example, a plating layer such as Ni plating is applied.

  The metallized layer 53 is provided on the entire side surface of the window member 14 and the entire peripheral edge portion of the one main surface 14 </ b> A of the window member 14. The metallized layer 53 is deposited on one main surface 14A of the window member 14 from the outer peripheral end to the center side of the window member 14 to a position protruding from the convex portion 54. The metallized layer 53 is deposited on the one main surface 14 </ b> A to a position protruding from the convex portion 54 by a length of 0.5 to 2 times the thickness W of the convex portion 54.

In the engine member 10, the projection 54 is provided on the inner peripheral surface of the through hole of the base 12, and the window member 14 is brazed to the side surface of the projection 54 and the peripheral edge of the one main surface 14 </ b> A of the window member 14. Compared with the case of brazing only the side surfaces, the brazing area is increased and the bonding strength is improved.

  In the engine member 10, as described above, the metallized layer 53 on the one main surface 14 </ b> A of the window member 14 is formed on the one main surface 14 </ b> A of the window member 14 at a position protruding to the center side from the convex portion 54. . Thereby, the meniscus of the smooth and big brazing material 52 connected to the metallized layer 53 from the edge part of the center side of the window member 14 of the convex part 54 can be formed. A portion corresponding to the meniscus (meniscus portion 57) functions as a buffer portion that relieves stress (mechanical stress or thermal stress) applied to the joint portion between the window member 14 and the base 12. For example, the stress due to the difference in thermal expansion coefficient between the window member 14 and the base 12 generated during brazing, the thermal stress caused by the temperature rise due to the explosion in the cylinder hollow portion 42A, and the mechanical stress caused by the pressure of this explosion Are alleviated by the meniscus portion 57.

  4A to 4D are schematic cross-sectional views illustrating another embodiment of the structure for an internal combustion engine. In FIGS. 4A to 4D, the same structure as that in FIGS. As shown in FIG. 4A, a plate-like reinforcing member 72 may be joined to the peripheral portion of the base 2 and the other main surface 14 b of the window member 14 via a brazing material 52. In this configuration, the peripheral line of the window member 14 is sandwiched between the reinforcing member 72 and the convex portion 54, and the window member 14 is firmly coupled to the base 2. The shape of the reinforcing member 72 is not particularly limited. For example, as shown in 14 (b), a part of the reinforcing member 72 may protrude so as to press the periphery of the other main surface 14 </ b> B of the window member 14. Further, as shown in FIG. 4C, the reinforcing member 72 is joined to both main surfaces (one main surface 14A and the other main surface 14B) of the window member 14 so as to be sandwiched between the two reinforcing members 72. May be. FIG. 4C shows an example in which the inner peripheral surface of the base 2 is not provided with the convex portion 54. Even when the inner peripheral surface of the base 2 is provided with the convex portion 54, the window member 14 may be sandwiched between the two reinforcing members 72. Further, the surface contacting the convex portion 54 on the inner peripheral surface of the base 2 is the other main surface 14B facing the inner side of the base 14 (the right side in FIGS. 3 and 4) on the side opposite to the side shown in FIG. There may be.

  The engine member 10 can be manufactured as follows, for example. First, for example, a disk-shaped window member 14 made of a single crystal sapphire having an outer diameter of 30 mm and a thickness of 2 mm is prepared. In addition, a plurality of part members constituting the base 12 are prepared. This part member is a member which comprises the base | substrate 12 by combining.

  A metal paste formed by mixing an organic binder and a solvent with Mo powder, Mn powder and silicon oxide (SiO 2) powder at a portion 3 mm wide from the side surface of the window member 14 and the outer peripheral edge of one main surface has a thickness of 10 μm. The metallized metal layer as the base of the metallized layer 53 is formed by printing, coating and baking at 1400 ° C. in a humidified forming gas after drying. Further, a Ni plating layer is deposited on the surface of the metallized metal layer to a thickness of about 2 μm by electrolytic plating to form a metallized layer 53.

The window member 14 in which the metallized layer 53 is formed is arranged at a position corresponding to the through hole of the part member constituting the base body 12 having the through hole in which the convex portion 54 is formed on the inner peripheral surface. The window member 14 is arrange | positioned so that it may fit in a through-hole from the side corresponding to the inner side of the base | substrate 12 of several part members. The convex portion 54 provided on the inner peripheral surface of the through hole of the part member has an inward protruding length of, for example, 2 mm and a thickness of, for example, 1 mm. Next, from the side of the other main surface of the window member 14 where the metallized layer 53 is not formed, that is, the side corresponding to the inside of the hollow portion of the base 12, the inner peripheral surface of the through hole of the part member and the side surface of the window member 14 A preform of the brazing material 52 made of an Ag—Cu alloy having a diameter of 0.8 mm is installed along the gap. The preform of the brazing material 52 is heated to 820 ° C., the gap between the side surface of the window member 14 and the inner peripheral surface of the part member, and the metallized layer 53 on the outer peripheral portion of the one main surface 14A of the window member 14 The molten brazing material 12 is caused to enter the gap with the convex portion 54 by capillary action, and the window member 14 and the part member are joined. With the piston 22, connecting rod 24, crank disk 26, intake valve 33, exhaust valve 34, etc. disposed inside the hollow portion, a plurality of part members are combined to produce the base 12 having a plurality of window members 14. Finally, a member such as a spark plug 36 is installed, and the engine 1 including the engine member 10 is assembled.

  FIG. 5 is a schematic configuration diagram illustrating a sensor-equipped engine 70 which is an embodiment of an internal combustion engine with a position detection mechanism of the present invention and also an embodiment of an internal combustion engine with a liquid state detection mechanism of the present invention. is there. The sensor-equipped engine 70 is mounted and used in an automobile body (not shown). The sensor-equipped engine 70 includes the engine 1 described above, a sensor unit 80A, and a sensor unit 80B.

  The sensor unit 80A includes a light emitting element such as a laser diode or a light emitting diode, and includes a light irradiation means 82A that emits light in a predetermined wavelength region, and a light receiving element such as a photodiode that converts the received light into an electrical signal. Photodetection means 84A and control means 86A are provided. The control means 86A includes a light irradiation control unit 92A that supplies power to the light irradiation means 82A and controls the light irradiation operation of the light irradiation means 82A, an information acquisition unit 94A that receives information detected by the light detection means 84A, and The information acquisition unit 94A is provided with a detection unit 96A that receives the information acquired and detects the position of the piston 22 in the cylinder hollow part 42A based on the acquired information.

  Similarly, the sensor unit 80B includes a light irradiation unit 82B, a light detection unit 84B, and a control unit 86B. The control unit 86A includes a light irradiation control unit 92B, an information acquisition unit 94B, and a detection unit 96B. I have. In each part of the sensor unit 80B, the detection unit 96B receives the information acquired by the information acquisition unit 94B, and based on the acquired information, the state of the oil 60 stored in the hollow portion 44B (contamination level in the present embodiment). Except that the sensor unit 80A has the same function.

First, the sensor unit 80A will be described. The light irradiation means 82A of the sensor unit 80A is arranged in the vicinity of the window member 14a provided on the side surface on the top dead center side of the cylinder portion 42 of the base 12 and has a predetermined wavelength region emitted from the light irradiation means 82A. The light passes through the window member 14a and enters the cylinder hollow portion 42A where the piston 22 reciprocates. In the state where the piston 22 is relatively located at the bottom dead center side, the light incident on the cylinder hollow portion 42A passes through the cylinder hollow portion 42A as it is and passes through another window member 14b provided in the cylinder portion 42. The light passes through and is emitted out of the substrate 12. The light transmitted through the window member 14b and emitted from the base 12 enters the light detection means 84A.

  The piston 22 reciprocates in the cylinder hollow portion 42A. In the engine 70 with a sensor, the irradiation light from the light irradiation means 82A is passed at a timing when the piston 22 passes a predetermined position set very close to the top dead center. Is blocked by the piston 22. At this timing, the light reaching the light detection means 84A is extremely reduced. The detection unit 96A detects the position of the piston 22 at the timing when the light reaching the light detection unit 84A is extremely reduced as the piston 22 is a predetermined position near the top dead center, and generates a predetermined signal. The sensor unit 80A is connected to an automobile body on which the internal combustion engine 70 is mounted, and information detected by the detection unit 96A is sent to a control unit (not shown) that controls the operation of the engine 1. A control unit (not shown) acquires information indicating that the piston 22 has reached a predetermined position near the top dead center, transmitted from the detector 96A, and based on this information, the intake valve 32, the exhaust valve 34, the ignition The operation timing of the plug 36 and the like is controlled. By controlling the operation of the engine 1 using information detected by the sensor unit 80A, the fuel consumption of the engine 1 can be reduced and the output of the engine 1 can be increased.

  The cylinder hollow portion 42A in which the piston 22 reciprocates is a portion corresponding to a combustion chamber in which an explosion occurs inside, and it is difficult to confirm the internal piston position from the outside. In this embodiment, the window member 14 made of a sapphire single crystal having high resistance to heat and pressure is provided on the side surface of the cylinder portion 42 of the base body 12 on the top dead center side of the piston 22. The position of the piston 22 can be confirmed optically. Since the light irradiation means 82A and the light detection means 84B are arranged outside the base 12 and maintained at a relatively low temperature, malfunction of the device due to an excessive rise in temperature is also suppressed. In addition to using the light irradiation means 82A, for example, the movement of the piston 22 in the hollow portion 44 may be photographed from the outside of the window member 14 with a CCD camera or the like, and the position of the piston 22 may be confirmed from the photographed image.

  Next, the sensor unit 80B will be described. The light irradiation means 82B of the sensor unit 80B is disposed in the vicinity of the crank portion 44 of the base body 12, and the light in a predetermined wavelength region emitted from the light irradiation means 82B is transmitted through the window member 14c, and the oil 60 is It enters the stored crank hollow portion 44A. The light incident on the crank hollow portion 44 </ b> A passes through the oil 60, passes through another window member 14 d provided on the crank portion 44, and exits from the base 12. The light transmitted through the window member 14d and emitted from the base body 12 enters the light detection means 84B.

  The oil 60 is stored inside the base 12 and deteriorates with the operation of the engine 1. That is, with the operation of the engine 1, the oil 60 is contaminated with metal powder or carbide and becomes dirty, or the composition changes to increase the viscosity. As the deterioration of the oil 60 progresses, the light transmission becomes worse and visually changes to black. The light transmittance of the oil 60 represents the degree of deterioration of the oil 60. The detection unit 96B converts the amount of light reaching the light detection unit 84B into a degree of oil deterioration, and generates a signal representing the degree of oil deterioration. The sensor unit 80B is also connected to an automobile body on which the internal combustion engine 70 is mounted, and information detected by the detection unit 96A is displayed on a display panel or the like provided near the driver's seat. A driver who drives a vehicle (not shown) provided with the sensor-equipped engine 70 can check the degree of oil contamination in real time while driving the vehicle.

  The oil stored in the engine 1 contains various chemical substances. For example, when the window is made of a plastic material such as polycarbonate, the window is eroded by the oil and the light transmission is deteriorated. Easy to break. Moreover, since the oil used in the internal combustion engine in which an explosion occurs inside becomes high temperature, as described above, when the window is made of a plastic material such as polycarbonate, deterioration due to temperature becomes relatively large. In this embodiment, the window member 14 is made of a sapphire single crystal having high stability against various chemical substances and high resistance to heat, and the light transmittance of the oil 60 is increased through the window member 14. The accuracy can be confirmed. The light irradiation means 82B and the light detection means 84B are disposed outside the base 12 and are maintained at a relatively low temperature, so that malfunctions due to excessive temperature rise are also suppressed. In addition to using the light irradiation means 82B, for example, a picture of the oil 60 in the cylinder hollow portion 42A is taken from the outside of the window member 14 with a CCD camera or the like, and the deterioration state of the oil 60 is confirmed from the color information of the taken image. You can do it.

  In the above embodiment, the position information of the piston is detected as the position information of the moving body. However, the internal combustion engine with a position information detection mechanism of the present invention is not limited to the position of the piston, but the crank sealed in the hollow portion. You may detect the position of other moving bodies, such as a disk and a crankshaft. Further, the internal combustion engine with a liquid state detection mechanism of the present invention can detect not only the degree of contamination of the oil 60 but also the position of the oil 60 in the crank portion 44. The information detected by the present invention is not particularly limited. In the above embodiment, a so-called reciprocating engine is described as an example of the internal combustion engine. However, the type of the internal combustion engine may be, for example, a so-called known rotary engine, and is not particularly limited.

  Although the present invention has been described above, the present invention is not limited to the above embodiments, and various improvements and modifications may be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Engine member 12 Base | substrate 12A Hollow part 14 Window member 14a-14d Window member 22 Piston 24 Connecting rod 26 Crank disk 32 Intake valve 34 Exhaust valve 36 Spark plug 42 Cylinder part 42A Cylinder hollow part 44 Crank part 44A Crank hollow part 52 Brazing material 53 Metallized layer 54 Convex part 70 Sensor-equipped engine 80A, 80B Sensor units 82A, 82B Light irradiation means 84A, 84B Light detection means 86A, 86B Control means 92A, 92B Light irradiation control part 94A, 94B Information acquisition part 96B, 96B detection part

Claims (9)

A base that includes a hollow portion and that accommodates a moving body that moves in the hollow portion in response to an explosion generated in the hollow portion;
A window member that is provided on the base and transmits light that enters the hollow part from the outside of the base and light that exits from the outside of the base to the hollow part;
The structure for an internal combustion engine, wherein the window member is made of a sapphire single crystal. The window member is a plate-like body,
2. A structure for an internal combustion engine according to claim 1, wherein a side surface of the plate-like body is joined to an inner peripheral surface of a through hole provided in the base body by brazing. The base body includes a convex portion that protrudes from the inner peripheral surface of the through hole toward the center of the through hole on the inner peripheral surface of the through hole,
The structure for an internal combustion engine according to claim 2, wherein a peripheral portion of one main surface of the window member is joined to a side surface of the convex portion by brazing. The convex portion is
The internal combustion engine structure according to claim 3, wherein the structure is provided continuously along the circumferential direction of the inner circumferential surface of the through hole. The base includes a cylinder portion,
A piston that reciprocates in the cylinder portion in response to an explosion in the cylinder portion is provided as the moving body,
The internal combustion engine structure according to any one of claims 1 to 4, wherein the window member is disposed in the cylinder portion.   The structure for an internal combustion engine according to claim 1, wherein a plurality of the window members are arranged on the base body. A structure for an internal combustion engine according to any one of claims 1 to 6;
A light detection unit that detects light transmitted through the window member and emitted from the hollow portion to the outside of the base;
An internal combustion engine with a position detection mechanism, comprising: a piston position detection unit that detects a position of the moving body in the hollow portion based on information detected by the light detection unit. A structure for an internal combustion engine according to any one of claims 1 to 6;
A light detection unit that detects light transmitted through the window member and emitted from the hollow portion to the outside of the base;
An internal combustion engine with a liquid state detection mechanism, comprising: a detection unit that detects a state of the lubricating oil sealed in the hollow portion based on information detected by the light detection unit. A plurality of the window members are arranged on the base body,
Light in a predetermined wavelength region is incident on the hollow portion through the first window member among the plurality of window members, and the lubricating oil sealed in the base body is irradiated with light in the predetermined wavelength region. Comprising light irradiation means,
The liquid according to claim 8, wherein the light detection unit detects the light that passes through the liquid from the first window member and is emitted to the outside of the base body through the second window member. An internal combustion engine with a state detection mechanism.

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