JP4858415B2 - Lubricating device for internal combustion engine - Google Patents

Description

  The present invention relates to a lubricating device for an internal combustion engine, and in particular, is provided separately from an oil pan of the internal combustion engine, and is provided in an oil tank that stores lubricating oil, and a discharge path that communicates the oil pan and the oil tank. A first pump that sends lubricating oil from the oil tank to the oil tank, a second pump that is provided in a supply path that connects the oil tank and the lubricated part of the internal combustion engine, and that sends the lubricating oil from the oil tank to the lubricated part, and the internal combustion engine The present invention relates to a lubricating device for an internal combustion engine having an injection device for injecting lubricating oil onto the piston.

  A scavenge pump (first engine) that is provided separately from the oil pan of the internal combustion engine, is provided in an oil tank that stores lubricating oil, and a discharge path that connects the oil pan and the oil tank, and sends the lubricating oil from the oil pan to the oil tank. Pump), a feed pump (second pump) that is provided in a supply path that communicates between the oil tank and the lubricated part of the internal combustion engine, and feeds the lubricating oil from the oil tank to the lubricated part, and the lubricating oil to the piston of the internal combustion engine An internal combustion engine lubrication device having an injection device for injecting fuel is known. Here, the injection device, for example, injects lubricating oil to the back side (opposite side of the combustion chamber side) of the piston head. When the lubricating oil is injected from the injection device when the piston is at a high temperature, the piston can be cooled by the lubricating oil.

  The prior art disclosed in Patent Document 1 discloses that an oil jet for injecting oil is provided on the back of the piston head, and oil supplied from an oil tank by an electric pump is injected on the back of the piston head at a low temperature start. Yes.

JP 2004-285974 A

  Conventionally, sufficient studies have not been made on improvement of the cooling effect of the piston in the case where an injection device for injecting lubricating oil is provided on the piston as in the prior art disclosed in Patent Document 1 above. For example, when knocking occurs in an internal combustion engine, it is desirable that the piston can be sufficiently cooled in order to suppress knocking or protect the piston.

  When the piston is not sufficiently cooled by the injected lubricating oil, it is necessary to use auxiliary means for suppressing knocking. For example, in addition to cooling of the piston, ignition delay control that retards the ignition timing of the internal combustion engine may be performed. In this case, the output of the internal combustion engine is reduced and the fuel consumption is deteriorated.

  It is desired that the piston cooling effect can be improved when an injection device for injecting lubricating oil is provided on the piston.

  An object of the present invention is to provide a lubricating device for an internal combustion engine that can improve the cooling effect of the piston in a lubricating device for an internal combustion engine having an injection device that injects lubricating oil onto the piston of the internal combustion engine.

  The internal combustion engine lubricating device of the present invention is provided separately from the oil pan of the internal combustion engine, provided in an oil tank that temporarily stores lubricating oil, and a discharge path that communicates the oil pan and the oil tank, A first pump that feeds lubricating oil from the oil pan to the oil tank, and a supply path that connects the oil tank and the lubricated portion of the internal combustion engine, and supplies the lubricating oil from the oil tank to the lubricated portion. A lubricating device for an internal combustion engine having a second pump for feeding and an injection device for injecting lubricating oil to a piston of the internal combustion engine, wherein the lubricating oil discharged from the first pump is discharged from the discharge path to the injection device. A first path that guides the lubricating oil discharged from the second pump from the supply path to the injection device, a first path opening / closing means that opens and closes the first path, A second path opening / closing means for opening / closing a path; and a knocking detection means for detecting occurrence of knocking in the internal combustion engine, wherein it is determined that the knocking has not occurred based on a detection result of the knocking detection means. The first path opening / closing means is opened and the second path opening / closing means is closed. When it is determined that the knocking has occurred, the first path opening / closing means is closed and the second path opening / closing means is closed. It is characterized by opening the means.

  In the lubricating device for an internal combustion engine according to the present invention, the oil tank is provided with a gas-liquid separator that separates bubbles contained in the lubricating oil from the lubricating oil, and the bubbles are removed by the gas-liquid separator. The lubricating oil is discharged from the second pump.

  In the lubricating device for an internal combustion engine of the present invention, the second path is provided with a gas-liquid separator that separates bubbles contained in the lubricating oil from the lubricating oil, and the bubbles are removed by the gas-liquid separator. The lubricated oil is supplied to the injection device.

  In the lubricating device for an internal combustion engine according to the present invention, the second pump has a relief valve, the second path is connected to the relief valve, and excess lubricating oil is discharged when the relief valve is opened. It is characterized by being.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling effect of a piston can be improved in the lubricating device of an internal combustion engine which has an injection device which injects lubricating oil to the piston of an internal combustion engine.

  Hereinafter, an embodiment of a lubricating device for an internal combustion engine of the present invention will be described in detail with reference to the drawings.

(First embodiment)
The first embodiment will be described with reference to FIGS. 1 and 2. The present embodiment is provided separately from the oil pan of the internal combustion engine, and is provided in an oil tank that stores the lubricating oil and a discharge path that connects the oil pan and the oil tank, and sends the lubricating oil from the oil pan to the oil tank. A first pump, a second pump that is provided in a supply path that connects the oil tank and the internal combustion engine, and that sends the lubricant from the oil tank to the internal combustion engine, and an injection that injects the lubricant into the piston of the internal combustion engine And a lubricating device for an internal combustion engine having the device.

  A lubricating device (see reference numeral 20 in FIG. 1) for supplying oil (lubricating oil) to the engine (see reference numeral 1 in FIG. 1) of the present embodiment is a so-called dry sump type, and an oil pan (indicated by reference numeral in FIG. 1) of the engine 1. 22) is sent to an oil tank (see reference numeral 21 in FIG. 1) by a scavenge pump (see reference numeral 25 in FIG. 1). Oil stored in the oil tank 21 is supplied to each part of the engine 1 by a feed pump (see reference numeral 26 in FIG. 1).

  The engine 1 is provided with an oil jet mechanism (see reference numeral 17 in FIG. 1) for injecting oil onto a piston (see reference numeral 6 in FIG. 1). Two paths for supplying oil to the oil jet mechanism 17 are provided. The first route is a first route (see reference numeral 27 in FIG. 1) through which oil discharged from the scavenge pump 25 is sent as it is. The second route is a second route (see reference numeral 30 in FIG. 1) to which oil sent from the oil tank 21 toward the engine 1 is supplied by the feed pump 26.

  Compared with the oil discharged from the scavenge pump 25, the oil stored in the oil tank 21 has a small amount of bubbles and a low temperature. In this embodiment, when it is not determined that knocking has occurred in the engine 1, the second path 30 is closed, and oil is supplied to the oil jet mechanism 17 via the first path 27 (arrow). B). On the other hand, when it is determined that knocking has occurred in the engine 1, the first path 27 is closed and the second path 30 is opened. It is supplied to the jet mechanism 17 (see arrow C). Thereby, the cooling effect of piston 6 at the time of occurrence of knocking is enhanced.

  FIG. 1 is a schematic configuration diagram of an apparatus according to the present embodiment.

  In FIG. 1, reference numeral 1 denotes an engine (internal combustion engine). The engine body 3 of the engine 1 is provided with a plurality of cylinders 2. The engine body 3 is provided with an intake passage 4 and an exhaust passage 5. Each cylinder 2 is provided with a piston 6 that can reciprocate inside the cylinder 2. A combustion chamber 7 is formed above the piston 6. The piston 6 is connected to the crankshaft 9 via a connecting rod 8. The crankshaft 9 is rotatably supported by the engine body 3.

  An intake valve 10 is provided at a connection portion between the intake passage 4 and the combustion chamber 7. An exhaust valve 11 is provided at a connection portion between the exhaust passage 5 and the combustion chamber 7. The engine body 3 is provided with a spark plug 12 that ignites the air-fuel mixture in the combustion chamber 7. The intake valve 10 and the exhaust valve 11 are respectively opened and closed by cams 13 and 14 that are rotationally driven in conjunction with the rotation of the crankshaft 9. A throttle valve 15 for adjusting the intake air amount is provided in the intake passage 4.

  The engine body 3 is provided with an oil jet mechanism (injection device) 17 including an oil injection nozzle 16 that injects oil (lubricating oil) toward the back side of the piston 6 (the side opposite to the combustion chamber 7 side). . A main oil hole 18 is provided in the engine body 3. The oil supplied to the engine body 3 is supplied to the lubricated portion of the engine body 3 through the main oil hole 18. The lubricated parts are, for example, a connecting rod 8, a crank journal (not shown) that supports the crankshaft 9, a cam journal (not shown), and the like.

  The lubrication device 20 of the present embodiment is a so-called dry sump lubrication device, and connects an oil tank 21 provided separately from the engine body 3, and an oil pan 22 and an oil tank 21 provided at the bottom of the engine 3. The discharge path 23, the supply path 24 connecting the oil tank 21 and the main oil hole 18, the scavenge pump (first pump) 25 provided in the discharge path 23, and the feed pump ( A second pump) 26. Each of the scavenge pump 25 and the feed pump 26 can be driven by the output of the engine 1.

  The oil tank 21 is provided separately from the oil pan 22 and temporarily stores oil. The scavenge pump 25 and the feed pump 26 operate so that oil is always stored in the oil tank 21 during operation of the engine 1. For example, the discharge amounts (capacities) of the scavenge pump 25 and the feed pump 26 are set so that the discharge amount of the scavenge pump 25 is larger than the discharge amount of the feed pump 26. Since oil is always stored in the oil tank 21, the oil discharged from the scavenge pump 25 and flowing into the oil tank 21 is temporarily stored until the oil is sucked out by the feed pump 26. It is stored in.

  While the oil is temporarily stored in the oil tank 21, the bubbles contained in the oil are discharged to the upper space. That is, in the oil tank 21, gas-liquid separation is performed and bubbles in the oil are removed. Therefore, the oil sucked out from the oil tank 21 and discharged by the feed pump 26 can be in a state where the bubble content is smaller than the oil discharged from the scavenge pump 25.

  The lubrication device 20 is provided at a first path 27 that connects the discharge path 23 and the oil jet mechanism 17 on the downstream side in the oil flow direction from the scavenge pump 25, and at a connection portion between the first path 27 and the discharge path 23. The first switching valve 28 is provided. The first switching valve 28 has a first state in which the oil discharged from the scavenge pump 25 is guided to the oil tank 21 as indicated by an arrow A, and the oil discharged from the scavenge pump 25 is supplied to the oil jet mechanism 17 as indicated by an arrow B. It can switch to the 2nd state to guide. That is, the first switching valve 28 has a function as first path opening / closing means for opening and closing the first path 27. The first path 27 is provided with a throttle 29 for increasing the hydraulic pressure.

  In the following description, the first state, that is, the oil discharged from the scavenge pump 25 is guided to the oil tank 21 as indicated by the arrow A, and the first path 27 is closed and the oil does not flow into the first path 27. The state is “the state where the first switching valve 28 is closed”, and the second state, that is, the oil discharged from the scavenge pump 25 when the first path 27 is opened is guided to the first path 27 as indicated by the arrow B, The state not guided to the oil tank 21 is referred to as “the first switching valve 28 is opened”.

  The lubricating device 20 has a second path 30 that connects the supply path 24 and the oil jet mechanism 17 on the downstream side of the feed pump 26 in the oil flow direction. The second path 30 and the first path 27 are connected to each other at the junction 31. In other words, the portion 32 on the downstream side of the junction 31 in the first path 27 constitutes a part of the first path 27 and is downstream of the junction 31 in the second path 30 as a part of the second path 30. A side portion 32 is formed. A second switching valve 51 as a second path opening / closing means for opening and closing the second path 30 is provided in a portion of the second path 30 upstream of the merging portion 31. When the second switching valve 51 is opened, oil is guided from the supply path 24 to the second path 30 as indicated by an arrow C. The oil that flows from the supply path 24 to the second path 30 is supplied to the oil jet mechanism 17 via the second path 30, the merging portion 31, and the portion 32 on the downstream side of the merging portion 31 in the second path 30. .

  The operations of the first switching valve 28 and the second switching valve 51 are controlled by an ECU (Electronic Control Unit) 40. The ECU 40 is configured as a computer including a microprocessor and peripheral devices such as RAM and ROM necessary for its operation. The ECU 40 includes a crank angle sensor 41 that outputs a signal corresponding to the crank angle of the engine 1, an oil temperature sensor 42 that outputs a signal corresponding to the oil temperature of the engine 1, and the cooling water temperature (cooling water temperature) of the engine 1. A coolant temperature sensor 43 that outputs a signal corresponding to the throttle valve, a throttle valve opening sensor 44 that outputs a signal corresponding to the opening of the throttle valve 15, a knock sensor (knocking detection means) 45 that detects the knocking state of the engine 1, etc. Sensors are connected. The ECU 40 controls various devices such as the spark plug 12 based on the output signals of these sensors. Further, the ECU 40 determines whether or not knocking has occurred based on the output signal of the knock sensor 45.

  Here, the operation of the present embodiment will be described with reference to FIG. FIG. 2 shows a switching valve control flow that is repeatedly executed at a predetermined cycle during operation of the engine 1 in order to control the operations of the first switching valve 28 and the second switching valve 51.

  First, in step S10, the operating state of the engine 1 is acquired by the ECU 40. As the operating state of the engine 1, for example, the rotational speed of the engine 1, the temperature of the oil, the coolant temperature, the opening degree of the throttle valve 15, and the like are acquired based on the output signals of the sensors 41 to 44 described above.

  Next, in step S20, the ECU 40 acquires an output voltage as an output signal of the knock sensor 45. The knock sensor 45 changes the output voltage in accordance with the degree of knocking, and outputs a larger voltage as the degree of knocking increases.

  Next, in step S30, a predetermined value determined in advance is read by the ECU 40. The predetermined value may be a threshold value of the output voltage of the knock sensor 45 for determining whether knocking has occurred. The predetermined value can be set, for example, as an output voltage corresponding to a case where the degree of knocking when the engine 1 is knocking is a predetermined degree. The ECU 40 reads the predetermined value stored in advance from the ROM.

  Next, in step S40, the ECU 40 determines whether or not the output voltage of the knock sensor 45 read in step S20 is larger than the predetermined value read in step S30. In step S40, it is determined whether knocking has occurred. As a result of the determination, when it is determined that the output voltage of the knock sensor 45 is larger than the predetermined value (threshold value of the output voltage of the knock sensor 45) (step S40-Y), the process proceeds to step S50. Otherwise (step S40-N), the process proceeds to step S60.

  In step S50, the ECU 40 opens the second switching valve 51 and closes the first switching valve 28. In step S50, control for enhancing the cooling effect of the piston 6 by the oil injected by the oil jet mechanism 17 is performed. When the first switching valve 28 is closed, that is, in the first state, the oil discharged from the scavenge pump 25 is guided to the oil tank 21 as indicated by the arrow A and is not guided to the first path 27. It becomes. Further, when the second switching valve 51 is opened, the oil flowing through the supply path 24 is supplied to the oil jet mechanism 17 through the second path 30 as indicated by an arrow C. That is, instead of the oil discharged from the scavenge pump 25, the oil stored in the oil tank 21 is injected from the oil jet mechanism 17 toward the back side of the piston 6. Thereby, as will be described below, the cooling effect of the piston 6 is enhanced.

  When the oil discharged from the scavenge pump 25 flows into the oil tank 21, the bubbles in the oil are discharged to the upper space while staying in the oil tank 21. That is, gas-liquid separation is performed in the oil tank 21 to reduce bubbles in the oil. Further, the oil is cooled while staying in the oil tank 21. Therefore, the oil stored in the oil tank 21 is at a lower temperature than the oil discharged from the scavenge pump 25 and has a small bubble content. For this reason, the oil stored in the oil tank 21 has a higher lubricating function and cooling function than the oil discharged from the scavenge pump 25. In order to supply oil having a higher lubricating function and cooling effect, it is desirable that the feed pump 26 be configured to suck out oil below the oil tank 21.

  The oil stored in the oil tank 21 is sucked by the feed pump 26 and directly supplied to the oil jet mechanism 17, so that the piston 6 can be sufficiently cooled even in an operation state in which knocking is particularly large. Thereby, overheating of piston 6 can be suppressed or knocking can be suppressed. When step S50 is executed, this control flow is returned.

  When a negative determination is made in step S40 and the process proceeds to step S60, in step S60, the ECU 40 closes the second switching valve 51 and opens the first switching valve 28. In this case, the oil discharged from the scavenge pump 25 passes through the first path 27 from the first switching valve 28 as indicated by the arrow B, and is injected to the piston 6 by the oil jet mechanism 17. When step S60 is executed, this control flow is returned.

  According to this embodiment, when it is not determined that knocking has occurred (step S40-N), the oil discharged from the scavenge pump 25 is injected to the piston 6 (step S60). On the other hand, when it is determined that knocking has occurred (step S40-Y), the oil stored in the oil tank 21 with relatively low temperature and low bubble content is transferred from the oil jet mechanism 17 to the back side of the piston 6. It is injected toward Since the piston 6 is cooled by oil having a low cooling effect and low bubbles, the knocking can be suppressed without assistance by other methods. For example, the frequency and period of assisting the suppression of knocking can be reduced by the ignition retard control that retards the ignition timing of the engine 1. As a result, it is possible to suppress a decrease in output and a deterioration in fuel consumption accompanying the ignition delay control.

  In the present embodiment, the oil stored in the oil tank 21 is not always supplied to the oil jet mechanism 17 but the oil in the oil tank 21 is supplied only when knocking occurs. Thereby, the increase in the capacity | capacitance (discharge amount) required for the feed pump 26 can be suppressed. When the oil stored in the oil tank 21 is always supplied to the oil jet mechanism 17, the discharge amount of the feed pump 26 is set so that the amount of oil supplied to the lubricated part via the main oil hole 18 is not insufficient. It is necessary to make a large one or to install a new pump. However, in this embodiment, since the oil in the oil tank 21 is supplied to the oil jet mechanism 17 only when knocking occurs, there is no need to increase the discharge amount of the feed pump 26 or provide a new pump.

(Modification of the first embodiment)
A modification of the first embodiment will be described.

  In addition to the configuration of the first embodiment (FIG. 1), means for promoting gas-liquid separation of the oil stored in the oil tank 21 can be provided. For example, a gas-liquid separator can be provided in the oil tank 21. As a result, it is possible to supply oil having a smaller bubble content to the engine 1 or the oil jet mechanism 17.

  In addition to the configuration of the first embodiment (FIG. 1), cooling means for cooling the oil stored in the oil tank 21 can be provided. For example, the oil tank 21 can be provided with a cooler. Thereby, it becomes possible to supply cooler oil to the engine 1 or the oil jet mechanism 17.

(Second Embodiment)
A second embodiment will be described with reference to FIG. In the second embodiment, only differences from the first embodiment will be described.

  In the lubricating device according to the present embodiment (see reference numeral 60 in FIG. 3), an oil separator (gas-liquid separator, see reference numeral 52 in FIG. 3) for separating bubbles and oil contained in oil is provided in the second path 30. This is different from the first embodiment (FIG. 1).

  FIG. 3 is a schematic configuration diagram of an apparatus according to the present embodiment. As shown in FIG. 3, an oil separator 52 is provided in the second path 30 in the lubricating device 60. The oil separator 52 is provided at the junction 31 where the second path 30 and the first path 27 merge. The oil separator 52 is provided with a return passage 52 a for returning the oil containing the separated bubbles to the oil tank 21.

  The oil flowing into the oil separator 52 from the second path 30 is separated into gas and liquid, for example, by centrifugation. The oil that has been gas-liquid separated and from which bubbles have been removed is discharged from the oil separator 52 to the portion 32 downstream of the junction 31. On the other hand, the oil containing bubbles is returned to the oil tank 21 through the return passage 52 a of the oil separator 52.

  Since oil bubbles are removed by the oil separator 52, when the oil stored in the oil tank 21 is supplied to the oil jet mechanism 17 (when knocking occurs), it is further than the stage stored in the oil tank 21. Oil in a state where the bubble content is low can be supplied to the oil jet mechanism 17. For this reason, the piston 6 can be cooled more reliably by the oil with less bubbles, and the cooling effect can be enhanced.

  In addition, since the oil bubbles supplied to the oil jet mechanism 17 through the first path 27 are also removed by the oil separator 52, the oil discharged from the scavenge pump 25 is discharged from the piston 6 when no knocking occurs. It is possible to enhance the cooling effect of the piston 6 when it is injected into the cylinder.

(Third embodiment)
A third embodiment will be described with reference to FIG. In the third embodiment, only differences from the above embodiments will be described.

  In the lubricating device of the present embodiment (see reference numeral 70 in FIG. 4), the oil discharged from the relief valve (see reference numeral 26a in FIG. 4) of the feed pump 26 is used as oil for cooling the piston 6. Different from the embodiment.

  FIG. 4 is a schematic configuration diagram of an apparatus according to the present embodiment. In the lubrication apparatus 70 of the present embodiment, the feed pump 26 is provided with a relief valve 26a. When the pressure of oil discharged from the feed pump 26 exceeds a predetermined pressure, the relief valve 26a is opened, and excess oil is discharged from the relief valve 26a. The second path 30 of the present embodiment is connected to a discharge port through which excess oil is discharged from the relief valve 26a.

  The second path 30 is provided with a second switching valve 53 instead of the second switching valve 51 of each of the above embodiments. A return passage 54 for returning oil discharged from the relief valve 26a to the oil tank 21 is connected to the second switching valve 53 of the present embodiment. The second switching valve 53 includes a third state in which oil discharged from the relief valve 26a is guided to the oil jet mechanism 17 as indicated by an arrow D, and oil discharged from the relief valve 26a is supplied to the oil tank 21 as indicated by an arrow E. It can switch to the 4th state to guide. That is, the second switching valve 53 has a function as second path opening / closing means for opening and closing the second path 30.

  In the following description, the third state, that is, the state where the second path 30 is opened and the oil discharged from the relief valve 26a is guided to the oil jet mechanism 17 as indicated by the arrow D and is not guided to the oil tank 21. In the fourth state, that is, the second path 30 is shut off, and the oil discharged from the relief valve 26a is guided to the oil tank 21 as indicated by an arrow E. The state not guided to the oil jet mechanism 17 is referred to as “the second switching valve 53 being closed”.

  The switching valve control of the present embodiment is the same as that of the first embodiment (FIG. 2). When it is determined that knocking has occurred in the engine 1 (step S40-Y), the second switching valve 53 is opened and the first switching valve 28 is closed (step S50). On the other hand, when it is not determined that knocking has occurred (step S40-N), the second switching valve 53 is closed and the first switching valve 28 is opened (step S60).

  In the present embodiment, relief oil (surplus oil) discharged from the relief valve 26 a is used as oil for cooling the piston 6. Therefore, the cooling effect of the piston 6 can be enhanced without increasing the discharge capacity of the feed pump 26 for cooling the piston 6. Further, the piston 6 can be cooled by supplying oil to the oil jet mechanism 17 without reducing the amount of oil supplied to the engine body 3. When knocking has not occurred, the relief oil is returned to the oil tank 21, so that even if bubbles are generated by the feed pump 26, the bubbles can be returned to the oil tank 21 together with the relief oil. Since air bubbles can be prevented from being supplied into the engine 1, the lubrication state of the engine body 3 can be improved, and the controllability of the variable valve timing mechanism (VVT) and the like can be improved.

1 is a schematic configuration diagram of a first embodiment of a lubricating device for an internal combustion engine of the present invention. It is a flowchart which shows operation | movement of 1st Embodiment of the lubricating device of the internal combustion engine of this invention. It is a schematic block diagram of 2nd Embodiment of the lubricating device of the internal combustion engine of this invention. It is a schematic block diagram of 3rd Embodiment of the lubricating device of the internal combustion engine of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder 3 Engine main body 4 Intake passage 5 Exhaust passage 6 Piston 7 Combustion chamber 8 Connecting rod 9 Crankshaft 10 Intake valve 11 Exhaust valve 13, 14 Cam 15 Throttle valve 16 Oil injection nozzle 17 Oil jet mechanism 18 Main oil hole 20 Lubrication Device 21 Oil tank 22 Oil pan 23 Discharge path 24 Supply path 25 Scavenge pump 26 Feed pump 26a Relief valve 27 First path 28 First switching valve 29 Restriction 30 Second path 31 Junction section 40 ECU
41 Crank angle sensor 42 Oil temperature sensor 43 Cooling water temperature sensor 44 Throttle valve opening sensor 45 Knock sensor 51 Second switching valve 52 Oil separator 52a Return passage 53 Second switching valve 54 Return passage 60 Lubricating device 70 Lubricating device

Claims (4)

Provided separately from the oil pan of the internal combustion engine, provided in an oil tank that temporarily stores lubricating oil, and in a discharge path that communicates the oil pan and the oil tank, the lubricating oil from the oil pan to the oil tank A first pump that feeds the oil tank, a second pump that feeds lubricating oil from the oil tank to the lubricated portion, and a supply path that communicates the oil tank and the lubricated portion of the internal combustion engine. An internal combustion engine lubrication device having an injection device for injecting lubricating oil onto a piston,
A first path for guiding lubricating oil discharged from the first pump from the discharge path to the injection device;
A second path for guiding the lubricating oil discharged from the second pump from the supply path to the injection device;
First path opening and closing means for opening and closing the first path;
Second path opening and closing means for opening and closing the second path;
Knocking detecting means for detecting occurrence of knocking in the internal combustion engine,
When it is determined that the knocking has not occurred based on the detection result of the knocking detection means, the first path opening / closing means is opened and the second path opening / closing means is closed, and the knocking has occurred. If it is determined, the internal combustion engine lubricating device characterized in that the first path opening / closing means is closed and the second path opening / closing means is opened. The internal combustion engine lubrication device according to claim 1,
The oil tank is provided with a gas-liquid separator that separates bubbles contained in the lubricating oil from the lubricating oil, and the lubricating oil from which the bubbles have been removed by the gas-liquid separator is discharged from the second pump. A lubricating device for an internal combustion engine, characterized in that: The internal combustion engine lubrication device according to claim 1 or 2,
The second path is provided with a gas-liquid separator that separates bubbles contained in the lubricant from the lubricant, and the lubricant from which the bubbles have been removed by the gas-liquid separator is supplied to the injection device. A lubricating device for an internal combustion engine, characterized in that: The internal combustion engine lubricating device according to any one of claims 1 to 3,
The second pump has a relief valve;
The internal combustion engine lubrication apparatus, wherein the second path is connected to the relief valve, and surplus lubricating oil is discharged when the relief valve is opened.

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