Oil supply mechanism, internal combustion engine unit and vehicle

Abstract

To provide an oil supply mechanism capable of suppressing wear of a sliding part of an internal combustion engine, an internal combustion engine unit and a vehicle.SOLUTION: An oil supply mechanism 12 includes: an oil pan 21 that stores oil to be supplied to an internal combustion engine 11; a sub-tank 24 that stores oil; an oil gallery 27 that supplies oil to at least one of a plurality of sliding parts 11a of the internal combustion engine 11; a selector valve 28 for selectively connecting the oil pan 21 and the sub-tank 24 to the oil gallery 27; an oil pump 22 that supplies the oil in the oil pan 21 to the selector valve 28 side and that drives by driving of the internal combustion engine 11; an electric pump 25 for supplying the oil in the sub-tank 24 to a secondary side; and a control section 18 that drives the electric pump 25 before start of the internal combustion engine 11 and controls the selector valve 28 to connect the sub-tank 24 and the oil gallery 27 by using the selector valve 28.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an oil supply mechanism for supplying oil to an internal combustion engine, an internal combustion engine unit, and a vehicle. [Background technology]

[0002] Vehicles powered by internal combustion engines have been known for some time. Such vehicles are known to have an oil supply mechanism that, when driven by the internal combustion engine, drives an oil pump that operates in synchronization with a rotating body such as a crankshaft of the internal combustion engine, thereby supplying oil from an oil pan to sliding parts of the internal combustion engine. Also known is a technology for supplying oil from a heat storage container to a piston to promote fuel vaporization (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-148121 Summary of the Invention [Problem to be solved by the invention]

[0004] In the oil supply mechanism described above, the oil pump is driven after the internal combustion engine is started, and oil begins to be supplied to the sliding parts. This causes a time lag between the start of the internal combustion engine and the time oil is supplied to the sliding parts. In particular, after the internal combustion engine is stopped, the oil in the sliding parts drops and is collected in the oil pan during the period between the time the internal combustion engine is next started and the time the oil pump is driven and the time oil is supplied to the sliding parts. Therefore, the sliding parts slide without a sufficient supply of oil until the oil pump is driven and oil is supplied to the sliding parts, which causes wear of the sliding parts.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an oil supply mechanism, an internal combustion engine unit, and a vehicle that can suppress wear on the sliding parts of an internal combustion engine. [Means for solving the problem]

[0006] According to one aspect of the present invention, an oil supply mechanism includes an oil pan that stores oil to be supplied to an internal combustion engine, a sub-tank that stores the oil, an oil gallery that supplies the oil to at least one of a plurality of sliding parts of the internal combustion engine, a switching valve that selectively connects the oil pan and the sub-tank to the oil gallery, an oil pump that is driven by the internal combustion engine and supplies the oil in the oil pan to the switching valve side, an electric pump that supplies the oil in the sub-tank to the secondary side, and a control unit that drives the electric pump and controls the switching valve to connect the sub-tank and the oil gallery before starting the internal combustion engine. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an oil supply mechanism, an internal combustion engine unit, and a vehicle that can suppress wear on sliding parts of an internal combustion engine. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram that schematically shows the configuration of a vehicle according to an embodiment. [Figure 2] FIG. 2 is an explanatory diagram that schematically shows the configuration of the internal combustion engine and oil supply mechanism of the vehicle according to the embodiment. [Figure 3] FIG. 3 is an explanatory diagram showing an example of use of the oil supply mechanism according to the embodiment. [Figure 4] FIG. 4 is an explanatory diagram showing an example of use of the oil supply mechanism according to the embodiment. [Figure 5] FIG. 5 is a flowchart showing an example of control of the oil supply mechanism according to the embodiment. [Figure 6] FIG. 6 is an explanatory diagram showing an example of the relationship between oil gallery oil pressure and time in the oil supply mechanism according to the embodiment and the oil supply mechanism of the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0009] A vehicle 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is an explanatory diagram that schematically shows the configuration of the vehicle 1. FIG. 2 is an explanatory diagram that schematically shows a partial configuration of an internal combustion engine 11 and the configuration of an oil supply mechanism 12 used in the vehicle 1. FIG. 3 is an explanatory diagram that shows an example of use of the oil supply mechanism 12 before cranking the internal combustion engine 11, and FIG. 4 is an explanatory diagram that shows an example of use of the oil supply mechanism 12 after cranking the internal combustion engine 11. FIG. 5 is a flow chart that shows an example of control of the oil supply mechanism 12, and FIG. 6 is a graph that shows an example of the relationship between oil gallery hydraulic pressure and time for the oil supply mechanism 12 of the embodiment and a conventional oil supply mechanism. In each diagram, the configuration is enlarged, reduced, or omitted as appropriate.

[0010] As shown in FIG. 1, vehicle 1 has an internal combustion engine 11 as a power source and an oil supply mechanism 12 that supplies oil to each sliding part 11a of internal combustion engine 11. Note that vehicle 1 may be a hybrid electric vehicle (HEV) that is equipped with one or more motors as a power source in addition to internal combustion engine 11. Vehicle 1 is, for example, a truck. Vehicle 1 is, for example, a flatbed vehicle, a wing vehicle, a covered vehicle, a crane vehicle, an on-board vehicle, a tanker truck, etc. Note that vehicle 1 is not limited to a truck and may be a bus, a passenger car, a special-purpose vehicle, etc.

[0011] As a specific example, the vehicle 1 includes an internal combustion engine 11, an oil supply mechanism 12, a main switch (main SW) 15, a starter motor switch (starter motor SW) 16, a memory unit 17, and a control unit 18. The vehicle 1 also includes a chassis 19 having a drive shaft, an automatic transmission, a power transmission device, four or more wheels, a cabin, a battery, a cooling fan including a heat exchanger, and the like.

[0012] The internal combustion engine 11 is, for example, a gasoline engine or a diesel engine. In the following description, the "internal combustion engine" may also be referred to as the "engine." The internal combustion engine 11 is, for example, a multi-cylinder engine having a plurality of different sliding parts 11a. The internal combustion engine 11 is connected to a fuel tank. The internal combustion engine 11 is supplied with fuel from the fuel tank and operates to generate power (torque) that serves as a driving force. Examples of the sliding parts 11a include a crank journal 11a1, a valve train 11a2, and a gear 11a3. Note that the sliding parts 11a are not limited to the crank journal 11a1, the valve train 11a2, and the gear 11a3, but may be any component in which two or more elements slide against each other and to which oil is supplied by the oil supply mechanism 12. The crank journal 11a1, which is one of the sliding parts 11a, includes a crankshaft and a bearing. The valve train 11a2, which is one of the sliding parts 11a, includes, for example, intake valves and exhaust valves of the combustion chambers and a camshaft.

[0013] The oil supply mechanism 12 supplies engine oil (hereinafter referred to as "oil") to each sliding part 11a, which is a supply destination of the internal combustion engine 11. As shown in Fig. 2, the oil supply mechanism 12 includes, for example, an oil pan 21, an oil pump 22, a first supply pipe 23, a sub-tank 24, an electric pump 25, a second supply pipe 26, an oil gallery 27, a switching valve 28, a supply pipe 29, an on-off valve 30, a first pressure sensor 31, and a second pressure sensor 32. The oil supply mechanism 12 also includes a control unit 18.

[0014] The oil pan 21 is provided below the internal combustion engine 11. The oil pan 21 can store a predetermined amount of oil.

[0015] The oil pump 22 is driven by the internal combustion engine 11. As a specific example, the oil pump 22 is driven in synchronization with the rotation of the crank journal 11a1 of the internal combustion engine 11. The oil pump 22 supplies oil from the oil pan 21 to the switching valve 28 side.

[0016] The first supply pipe 23 fluidly connects the oil pump 22 and the switching valve 28 .

[0017] The sub-tank 24 can store a predetermined amount of oil. The oil pan 21 and the sub-tank 24 are formed so that the oil supplied to the sliding parts 11a of the internal combustion engine 11 can be recovered by dropping from the internal combustion engine 11 or through return flow paths connected to each sliding part 11a of the internal combustion engine 11.

[0018] The electric pump 25 is connected to the control unit 18 and is driven and controlled by the control unit 18. When the electric pump 25 is driven, the oil in the sub-tank 24 provided on the primary side of the electric pump 25 is supplied to the secondary side of the electric pump 25.

[0019] The second supply pipe 26 fluidly connects the electric pump 25 and the switching valve 28 .

[0020] The oil gallery 27 is a flow path through which oil flows, provided in, for example, a cylinder block or a cylinder head of the internal combustion engine 11. The oil gallery 27 constitutes a flow path that supplies oil to, for example, at least one of the plurality of sliding parts 11a, specifically, the crank journal 11a1. In addition, a supply pipe 29 that forms a flow path that supplies oil to the sliding parts 11a other than the sliding part 11a (crank journal 11a1) connected to the oil gallery 27 is connected to the oil gallery 27.

[0021] The switching valve 28 is connected to, for example, the first supply pipe 23, the second supply pipe 26, and the oil gallery 27, and is configured to be able to selectively switch between a first connection connecting the first supply pipe 23 and the oil gallery 27, and a second connection connecting the second supply pipe 26 and the oil gallery 27. Fig. 3 shows the first connection state of the switching valve 28, and Fig. 4 shows the second connection state of the switching valve 28. In Figs. 3 and 4, the open parts of the switching valve 28 indicate open flow paths, and the filled parts of the switching valve 28 indicate closed flow paths.

[0022] The switching valve 28 is, for example, a three-way valve. The switching valve 28 is, for example, an electromagnetic valve that is connected to the control unit 18 and is configured to be able to switch between the first connection and the second connection by being controlled by the control unit 18. Note that the switching valve 28 may be configured to be able to switch between the first connection and the second connection by hydraulic pressure.

[0023] The supply pipe 29 fluidly connects, for example, the oil gallery 27 with the valve train 11a2, the gear 11a3, and the like, which are other sliding parts 11a than the sliding part 11a (crank journal 11a1) connected by the oil gallery 27. Note that the supply pipe 29 only needs to be able to form a flow path that can fluidly connect the oil gallery 27 connected to the crank journal 11a1 with the sliding parts 11a other than the crank journal 11a1. Furthermore, the supply pipe 29 is not limited to piping, and may be configured such that a part or all of it is formed by a hole or the like formed in the cylinder block or the cylinder head.

[0024] The on-off valve 30 is provided, for example, between the oil gallery 27 and the supply pipe 29, and opens and closes the flow path. The on-off valve 30 is, for example, an electromagnetic valve connected to the control unit 18 and configured to be able to open and close the flow path of the oil gallery 27 and the supply pipe 29 by being controlled by the control unit 18. Note that the on-off valve 30 may also be configured to be able to open and close the flow path of the oil gallery 27 and the supply pipe 29 by hydraulic pressure. Fig. 3 shows the on-off valve 30 in a closed state, and Fig. 4 shows the on-off valve 30 in an open state. In Figs. 3 and 4, the open part of the on-off valve 30 indicates the open state, and the filled part of the on-off valve 30 indicates the closed state.

[0025] The first pressure sensor 31 detects the pressure of the oil pump 22 and the switching valve 28 (oil pump pressure P1).

[0026] The second pressure sensor 32 detects the pressure between the electric pump 25 and the switching valve 28 (electric pump pressure P2).

[0027] The main switch 15 is configured to be switchable between OFF and ON by the driver's operation. The main switch 15 is connected to the control unit 18 and outputs operation information to the control unit 18. When the main switch 15 is operated to OFF, it cuts off the power supply to the entire vehicle 1 all at once.

[0028] The starter motor switch 16 is configured to be switchable between OFF and ON by the driver's operation. The starter motor switch 16 is configured to be capable of driving a starter motor, which is a device for cranking the internal combustion engine 11. For example, the main switch 15 and the starter motor switch 16 are formed integrally, and are configured to be switchable between OFF and ON by the driver's operation.

[0029] For example, the main switch 15 and the starter motor switch 16 may be formed as an integrated unit, and configured so that the main switch 15 and the starter motor switch 16 can be switched between OFF and ON by inserting a key and turning the key. For example, such an integrated main switch 15 and starter motor switch 16 may be formed so that the main switch 15 and the starter motor switch 16 can be switched between OFF, ON, and ON by turning the key between three positions. Alternatively, the integrated main switch 15 and starter motor switch 16 may be formed as a depressable operation button, and configured so that the main switch 15 can be switched between ON and OFF by pressing the operation button, and the starter motor switch 16 can be switched ON by pressing the operation button while depressing the brake pedal. Alternatively, the main switch 15 and the starter motor switch 16 may be provided as separate units.

[0030] The storage unit 17 is a storage medium. The storage unit 17 is a memory device such as a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), an SSD (Solid State Drive), or an integrated circuit storage device that stores various data. The storage unit 17 may be realized by a single physical memory device, or may be realized by multiple physically separated memory devices. The storage unit 17 stores various control setting values ​​and various control programs for controlling the vehicle 1. The storage unit 17 also stores information detected by the first pressure sensor 31 and the second pressure sensor 32.

[0031] The control unit 18 is a computing device. The control unit 18 is, for example, an ECU (Electronic Control Unit). The control unit 18 controls at least one of various electrical components such as chassis control, motor control, headlight control, air conditioning system control, fuel cell system control, brake system control, lane keeping system control, following distance control system control, and car navigation system control. The control unit 18 is connected to various devices including the main switch 15, the starter motor switch 16, the first pressure sensor 31, and the second pressure sensor 32, and receives output signals from these devices. The control unit 18 is connected to the internal combustion engine 11, the electric pump 25, etc., and controls these components.

[0032] The control unit 18 includes, as software configurations, an electric pump control unit that drives and controls the electric pump 25, and a switching determination unit that determines switching of the switching valve 28 and the on-off valve 30. The electric pump control unit starts the electric pump 25 when the main switch 15 is turned from OFF to ON, and stops the electric pump 25 when the oil pump pressure P1 detected by the first pressure sensor 31 becomes higher than the electric pump pressure P2 detected by the second pressure sensor 32. When the main switch 15 is turned from OFF to ON, the switching determination unit switches the switching valve 28 from the first connection to the second connection so as to connect the sub-tank 24 and the oil gallery 27, and closes the on-off valve 30. Furthermore, when the oil pump pressure P1 detected by the first pressure sensor 31 becomes higher than the electric pump pressure P2 detected by the second pressure sensor 32, the switching determination unit switches the switching valve 28 from the second connection to the first connection and opens the on-off valve 30.

[0033] Next, an example of a method for controlling the oil supply mechanism 12 of the vehicle 1 configured as above will be described with reference to the explanatory diagrams of FIGS. 3 and 4 showing the flow of oil in the oil supply mechanism 12, and the flow chart of FIG.

[0034] First, when the power supply to the vehicle 1 is cut off and the main switch 15 is OFF, if the driver operates the main switch 15 to turn ON the main switch 15, the control unit 18 receives a signal indicating that the main switch 15 is ON (step ST1). The control unit 18 then drives the electric pump 25, switches the switching valve 28 from the first connection to the second connection, and closes the on-off valve 30 (step ST2). This creates a flow path for oil to flow from the sub-tank 24 through the second supply pipe 26, the switching valve 28, and the oil gallery 27 to the crank journal 11a1, which is one of the sliding parts 11a. The electric pump 25 then increases the oil pressure in the oil gallery 27, and oil from the sub-tank 24 is supplied to the crank journal 11a1.

[0035] When the driver operates the starter motor switch 16 to turn it ON, the control unit 18 drives the starter motor, etc., to crank the internal combustion engine 11 (step ST3). Cranking the internal combustion engine 11 rotates the crankshaft, and the oil pump 22 starts. At this time, the switching valve 28 is in the second connection, so the secondary side of the oil pump 22 is closed, and the oil pump pressure P1 increases. The control unit 18 monitors the oil pump pressure P1 detected by the first pressure sensor 31 and the electric pump pressure P2 detected by the second pressure sensor 32, and determines whether the oil pump pressure P1 is higher than the electric pump pressure P2 (step ST4). If the oil pump pressure P1 is equal to or lower than the electric pump pressure P2 (NO in step ST4), the control unit 18 continues to monitor the oil pump pressure P1 and the electric pump pressure P2.

[0036] If the oil pump pressure P1 is higher than the electric pump pressure P2 (YES in step ST4), the control unit 18 stops the electric pump 25, switches the switching valve 28 from the second connection to the first connection, and opens the on-off valve 30 (step ST5). This closes the flow path from the sub-tank 24 to the oil gallery 27, and opens the flow path through which oil flows from the oil pan 21 to the oil gallery 27 via the first supply pipe 23 and the switching valve 28. In addition, because the on-off valve 30 is open, the oil gallery 27 is fluidly connected to the supply pipe 29. Therefore, the oil pressure in the oil gallery 27 is maintained by the oil pump 22, and the oil pressure in the supply pipe 29 increases, so that oil is supplied not only to the crank journal 11a1 but also to the sliding parts 11a other than the crank journal 11a1, such as the valve train 11a2 and the gear 11a3. The electric pump 25 is stopped, the switching valve 28 is in the first connection, and the on-off valve 30 is open, and these conditions continue until the main switch 15 is turned OFF and then turned ON.

[0037] According to the oil supply mechanism 12 and vehicle 1 configured in this manner, oil is supplied to the sliding part 11a by the electric pump 25 from immediately before the start of the internal combustion engine 11 to immediately after the start of the internal combustion engine 11. Furthermore, when the oil pump pressure P1 generated by the oil pump 22 exceeds the electric pump pressure P2 generated by the electric pump 25 after the start of the internal combustion engine 11, the switching valve 28 switches to oil supply from the oil pump 22 only. As a result, as shown in Fig. 6, the oil supply mechanism 12 can supply oil to any of the sliding parts 11a via the oil gallery 27 by increasing the oil pressure in the oil gallery 27 before the internal combustion engine 11 starts cranking.

[0038] Specifically, as shown by the dashed line in FIG. 6 , in a conventional oil supply mechanism without an electric pump 25, the oil pump 22 is driven in synchronization with the drive of the internal combustion engine 11, so the oil pressure in the oil gallery 27 gradually increases from the start of cranking. Therefore, in the comparative example oil supply mechanism without an electric pump 25, oil is supplied to the sliding part 11a with a time lag after the sliding part 11a starts to slide. However, as shown by the solid line in FIG. 6 , the oil supply mechanism 12 of the embodiment can increase the oil pressure in the oil gallery 27 by using the electric pump 25 before the internal combustion engine 11 cranks and the sliding part 11a starts to slide. Therefore, the oil supply mechanism 12 can supply oil to one of the sliding parts 11a before cranking. For example, in the example of the present embodiment, oil can be supplied to the crank journal 11a1 before the internal combustion engine 11 starts to slide. Therefore, the oil supply mechanism 12 and the vehicle 1 can prevent the crank journal 11a1 from sliding and wearing out when oil is not being supplied to the crank journal 11a1.

[0039] Furthermore, the oil supply mechanism 12 stops the electric pump 25 when the oil pump pressure P1 of the oil pump 22 becomes greater than the electric pump pressure P2 of the electric pump 25. Additionally, the electric pump 25 is driven from immediately before the internal combustion engine 11 is started (cranked) until immediately after the internal combustion engine 11 is started, and therefore its driving period is limited. Therefore, the oil supply mechanism 12 can reduce energy loss due to the driving of the electric pump 25. Furthermore, by supplying oil to any one of the multiple sliding parts 11a, the sliding parts 11a to which oil is supplied by the electric pump 25 are limited. Therefore, the capacity of the sub-tank 24 used in the oil supply mechanism 12 may be small, and the performance of the electric pump 25 may be low. Therefore, the space required for providing the sub-tank 24 and the electric pump 25 may be small, and therefore the oil supply mechanism 12 can suppress increases in cost, a reduction in design freedom, increases in weight, and the like.

[0040] As described above, according to the oil supply mechanism 12 and vehicle 1 of the embodiment, wear on the sliding part 11a of the internal combustion engine 11 can be suppressed by supplying oil to the sliding part 11a by the electric pump 25 before the oil pump 22 is started.

[0041] The present invention is not limited to the above embodiment. For example, in the above example, the sliding part 11a to which oil is supplied by the electric pump 25 before cranking of the internal combustion engine 11 is the crank journal 11a1. However, the present invention is not limited to this. Oil may be supplied to some of the other sliding parts 11a in addition to the crank journal 11a1. In other words, the sliding parts 11a to which oil is supplied by the electric pump 25 do not have to be all sliding parts 11a, but may be at least one of the sliding parts 11a as appropriate. In addition, when the oil supply mechanism 12 is configured in this way, an on-off valve 30 may be disposed in the flow path between the sliding parts 11a to which oil is supplied and the sliding parts 11a to which oil is not supplied.

[0042] In the above example, after the internal combustion engine 11 is started, the oil pump pressure P1 detected by the first pressure sensor 31 is monitored in step ST4 to determine whether to stop the electric pump 25 and switch the switching valve 28 and the on-off valve 30. However, the present invention is not limited to this. For example, the control unit 18 may estimate the oil pump pressure P1 from the rotation speed of the internal combustion engine 11 and the time elapsed since the start of the internal combustion engine 11, and may determine to stop the electric pump 25 and switch the switching valve 28 and the on-off valve 30 when the estimated oil pump pressure P1 exceeds an electric pump pressure P2 of the electric pump 25. Furthermore, the control unit 18 may determine to stop the electric pump 25 and switch the switching valve 28 and the on-off valve 30 when the oil pump pressure P1 detected by the first pressure sensor 31 or the estimated oil pump pressure P1 exceeds a threshold value stored in the memory unit 17.

[0043] In the above example, the oil supply mechanism 12 is provided in the vehicle 1, but the invention is not limited to this and may be provided in other vehicles such as a ship or a motorcycle, or in equipment or devices such as a generator. In other words, any unit having the internal combustion engine 11 and the oil supply mechanism 12 (hereinafter referred to as an internal combustion engine unit) may be used, and the internal combustion engine unit can be applied to various types of equipment, devices, and vehicles.

[0044] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. [Explanation of symbols]

[0045] 1...vehicle, 11...internal combustion engine, 11...internal combustion engine, 11a...sliding part, 11a1...crank journal, 11a2...valve system, 11a3...gear, 12...oil supply mechanism, 15...main switch (main SW), 16...starter motor switch (starter motor SW), 17...memory unit, 18...control unit, 19...chassis, 21...oil pan, 22...oil pump, 23...first supply pipe, 24...sub-tank, 25...electric pump, 26...second supply pipe, 27...oil gallery, 28...switching valve, 29...supply pipe, 30...opening / closing valve, 31...first pressure sensor, 32...second pressure sensor.

Claims

1. an oil pan that stores oil to be supplied to the internal combustion engine; a sub-tank for storing the oil; an oil gallery that supplies the oil to at least one of a plurality of sliding parts of the internal combustion engine; a switching valve that selectively connects the oil pan and the sub-tank to the oil gallery; an oil pump driven by the internal combustion engine to supply the oil in the oil pan to the switching valve side; an electric pump that supplies the oil in the sub-tank to a secondary side; a control unit that drives the electric pump and controls the switching valve to connect the sub-tank and the oil gallery before starting the internal combustion engine; An oil supply mechanism comprising:

2. the control unit stops the electric pump when the oil pressure of the oil pump that is driven after the internal combustion engine is started is higher than the oil pressure of the electric pump; 2. The oil supply mechanism according to claim 1, wherein the switching valve connects the oil pan and the oil gallery when the oil pressure of the oil pump, which is driven after the internal combustion engine is started, is higher than the oil pressure of the electric pump.

3. a supply pipe provided on a secondary side of the oil gallery and supplying the oil to another supply destination of the internal combustion engine; an on-off valve that is provided between the oil gallery and the supply pipe and that opens when the electric pump is stopped and the oil pump is driven; The oil supply mechanism according to claim 2 , comprising:

4. The oil supply mechanism according to claim 3 , wherein the switching valve and the on-off valve are electromagnetic valves controlled by the control unit.

5. The oil supply mechanism according to claim 1 or 4; the internal combustion engine; An internal combustion engine unit comprising:

6. A vehicle comprising the internal combustion engine unit according to claim 5.

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